1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2023 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * When C2X features are enabled and the base argument is 0 or 2, the
13 following functions support binary integers prefixed by 0b or 0B as
14 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
15 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
16 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
17 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq. Similarly, the
18 following functions support binary integers prefixed by 0b or 0B as
19 input to the %i format: fscanf, scanf, sscanf, vscanf, vsscanf,
20 vfscanf, fwscanf, wscanf, swscanf, vfwscanf, vwscanf, vswscanf.
22 * PRIb* and PRIB* macros from C2X have been added to <inttypes.h>.
24 Deprecated and removed features, and other changes affecting compatibility:
26 * In the Linux kernel for the hppa/parisc architecture some of the
27 MADV_XXX constants were changed to have the same values as the other
28 architectures. New programs compiled with this glibc version and which
29 use the madvise call will require at least Linux kernel version 6.2,
30 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
31 5.4.228, 4.19.270 or 4.14.303.
33 * The --disable-experimental-malloc is no longer available. The per-thread
34 cache can still be disable per-application using tunables
35 (glibc.malloc.tcache_count set to zero).
37 Changes to build and runtime requirements:
39 [Add changes to build and runtime requirements here]
41 Security related changes:
43 CVE-2023-25139: When the printf family of functions is called with a
44 format specifier that uses an <apostrophe> (enable grouping) and a
45 minimum width specifier, the resulting output could be larger than
46 reasonably expected by a caller that computed a tight bound on the
47 buffer size. The resulting larger than expected output could result
48 in a buffer overflow in the printf family of functions.
50 The following bugs are resolved with this release:
52 [The release manager will add the list generated by
53 scripts/list-fixed-bugs.py just before the release.]
59 * The getent tool now supports the --no-addrconfig option. The output of
60 getent with --no-addrconfig may contain addresses of families not
61 configured on the current host i.e. as-if you had not passed
62 AI_ADDRCONFIG to getaddrinfo calls.
64 Deprecated and removed features, and other changes affecting compatibility:
66 * The dynamic linker no longer loads shared objects from the "tls"
67 subdirectories on the library search path or the subdirectory that
68 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
69 search mechanism, which was deprecated in version 2.33.
71 Security related changes:
73 CVE-2022-39046: When the syslog function is passed a crafted input
74 string larger than 1024 bytes, it reads uninitialized memory from the
75 heap and prints it to the target log file, potentially revealing a
76 portion of the contents of the heap.
78 The following bugs are resolved with this release:
80 [12154] network: Cannot resolve hosts which have wildcard aliases
81 [12165] libc: readdir: Do not skip entries with zero d_ino values
82 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
83 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
84 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
85 AF_INET6 address (ie docker)
86 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
88 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
89 [28937] dynamic-link: New DSO dependency sorter does not put new map
91 [29249] libc: csu/libc-tls.c:202: undefined reference to
92 `_startup_fatal_not_constant'
93 [29305] network: Inefficient buffer space usage in nss_dns for
94 gethostbyname and other functions
95 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
96 [29402] nscd: nscd: No such file or directory
97 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
99 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
100 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
102 [29463] math: math/test-float128-y1 fails on x86_64
103 [29485] build: Make hangs when the test misc/tst-pidfile returns
105 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
107 [29499] build: Check failed on misc/tst-glibcsyscalls while building
108 for RISCV64 on a unmatched hardware
109 [29501] build: Check failed on stdlib/tst-strfrom while building for
110 RISCV64 on a unmatched hardware
111 [29502] libc: alpha sys/acct.h out of date
112 [29514] build: Need to use -fPIE not -fpie
113 [29528] dynamic-link: __libc_early_init not called after dlmopen that
115 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
116 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
118 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
120 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
122 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
123 [29576] build: librtld.os: in function `_dl_start_profile':
124 (.text+0x9444): undefined reference to `strcpy'
125 [29578] libc: Definition of SUN_LEN() is wrong
126 [29583] build: iconv failures on 32bit platform due to missing large
128 [29600] dynamic-link: dlmopen hangs after loading certain libraries
129 [29604] localedata: Update locale data to Unicode 15.0.0
130 [29605] nscd: Regression in NSCD backend of getaddrinfo
131 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
133 [29611] string: Optimized AVX2 string functions unconditionally use
135 [29624] malloc: errno is not cleared when entering main
136 [29638] libc: stdlib: arc4random fallback is never used
137 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
139 [29698] build: Configuring for AArch32 on ARMv8+ disables
141 [29727] locale: __strtol_internal out-of-bounds read when parsing
143 [29730] libc: broken y2038 support in fstatat on MIPS N64
144 [29746] libc: ppoll() does not switch to __ppoll64 when
145 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
146 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
147 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
148 aux.S: No such file or directory)
149 [29864] libc: __libc_start_main() should obtain program headers
150 address (_dl_phdr) from the auxv, not the ELF header.
151 [29951] time: daylight variable not set correctly if last DST change
152 coincides with offset change
153 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
154 length in fortify mode
160 * Support for DT_RELR relative relocation format has been added to
161 glibc. This is a new ELF dynamic tag that improves the size of
162 relative relocations in shared object files and position independent
163 executables (PIE). DT_RELR generation requires linker support for
164 -z pack-relative-relocs option, which is supported for some targets
165 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
167 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
168 have been added. The pidfd functionality provides access to a process
169 while avoiding the issue of PID reuse on tranditional Unix systems.
171 * On Linux, the process_madvise function has been added. It has the
172 same functionality as madvise but alters the target process identified
175 * On Linux, the process_mrelease function has been added. It allows a
176 caller to release the memory of a dying process. The release of the
177 memory is carried out in the context of the caller, using the caller's
178 CPU affinity, and priority with CPU usage accounted to the caller.
180 * The “no-aaaa” DNS stub resolver option has been added. System
181 administrators can use it to suppress AAAA queries made by the stub
182 resolver, including AAAA lookups triggered by NSS-based interfaces
183 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
184 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
185 produce IPv6 addresses, and configured IPv6 name servers are still
186 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
187 are translated to A queries. The new resolver option is intended
188 primarily for diagnostic purposes, to rule out that AAAA DNS queries
189 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
190 validation by applications.
192 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
193 and mount_setattr have been added. They are part of the new Linux kernel
194 mount APIs that allow applications to more flexibly configure and operate
195 on filesystem mounts. The new mount APIs are specifically designed to work
198 * localedef now accepts locale definition files encoded in UTF-8.
199 Previously, input bytes not within the ASCII range resulted in
200 unpredictable output.
202 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
203 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
204 Support for the char8_t typedef has been added per the ISO C2X N2653
205 proposal. The functions are declared in uchar.h in C2X mode or when the
206 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
207 The char8_t typedef is declared in uchar.h in C2X mode or when the
208 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
209 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
211 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
212 added. The functions wrap getrandom and/or /dev/urandom to return high-
213 quality randomness from the kernel.
215 * Support for LoongArch running on Linux has been added. This port requires
216 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
219 - loongarch64-linux-gnu
221 The LoongArch ABI is 64-bit little-endian.
223 Deprecated and removed features, and other changes affecting compatibility:
225 * Support for prelink will be removed in the next release; this includes
226 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
227 variables and their functionality in the dynamic loader.
229 * The Linux kernel version check has been removed along with the
230 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
231 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
232 when libc.so is issued directly.
234 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
236 The following bugs are resolved with this release:
238 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
239 return different result with versioned "foo"
240 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
242 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
243 ./exe and ld.so adjusts argv on the stack
244 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
246 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
247 consuming the second byte of certain double byte characters
248 [25812] stdio: Libio vtable protection is sometimes only partially
250 [27054] libc: pthread_atfork handlers that call pthread_atfork
252 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
254 [28128] build: declare_symbol_alias doesn't work for assembly codes
255 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
256 [28752] nss: Segfault in getpwuid when stat fails
257 [28815] libc: realpath should not copy to resolved buffer on error
258 [28828] stdio: fputwc crashes
259 [28838] libc: FAIL: elf/tst-p_align3
260 [28845] locale: ld-monetary.c should be updated to match ISO C and
262 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
264 [28852] libc: getaddrinfo leaks memory with AI_ALL
265 [28853] libc: tst-spawn6 changes current foreground process group
266 (breaks test isolation)
267 [28857] libc: FAIL: elf/tst-audit24a
268 [28860] build: --enable-kernel=5.1.0 build fails because of missing
269 __convert_scm_timestamps
270 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
271 inaccurate without /sys and /proc
272 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
274 [28880] libc: Program crashes if date beyone 2038
275 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
276 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
277 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
278 rtm variants when avoiding overflow
279 [28922] build: The .d dependency files aren't always generated
280 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
282 [28936] build: nm: No such file
283 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
284 [28953] nss: NSS lookup result can be incorrect if function lookup
286 [28970] math: benchtest: libmvec benchmark doesn't build with make
288 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
289 /sys/devices/system/cpu/possible
290 [28993] libc: closefrom() iterates until max int if no access to
292 [28996] libc: realpath fails to copy partial result to resolved buffer
294 [29027] math: [ia64] fabs fails with sNAN input
295 [29029] nptl: poll() spuriously returns EINTR during thread
296 cancellation and with cancellation disabled
297 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
298 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
299 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
300 is promoted to global scope
301 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
302 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
303 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
305 [29097] time: fchmodat does not handle 64 bit time_t for
307 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
309 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
310 [29162] string: [PATCH] string.h syntactic error:
311 include/bits/string_fortified.h:110: error: expected ',' or ';'
312 before '__fortified_attr_access'
313 [29165] libc: [Regression] broken argv adjustment
314 [29187] dynamic-link: [regression] broken argv adjustment for nios2
315 [29193] math: sincos produces a different output than sin/cos
316 [29197] string: __strncpy_power9() uses uninitialised register vs18
317 value for filling after \0
318 [29203] libc: daemon is not y2038 aware
319 [29204] libc: getusershell is not 2038 aware
320 [29207] libc: posix_fallocate fallback implementation is not y2038
322 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
323 [29209] libc: isfdtype is not y2038 aware
324 [29210] network: ruserpass is not y2038 aware
325 [29211] libc: __open_catalog is not y2038 aware
326 [29213] libc: gconv_parseconfdir is not y2038 aware
327 [29214] nptl: pthread_setcanceltype fails to set type
328 [29225] network: Mistyped define statement in socket/sys/socket.h in
330 [29274] nptl: __read_chk is not a cancellation point
331 [29279] libc: undefined reference to `mbstowcs_chk' after
332 464d189b9622932a75302290625de84931656ec0
333 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
334 correct for !__ASSUME_TIME64_SYSCALLS
335 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
336 missing on microblaze with largefile
342 * Unicode 14.0.0 Support: Character encoding, character type info, and
343 transliteration tables are all updated to Unicode 14.0.0, using
344 generator scripts contributed by Mike FABIAN (Red Hat).
346 * Bump r_version in the debugger interface to 2 and add a new field,
347 r_next, support multiple namespaces.
349 * Support for the C.UTF-8 locale has been added to glibc. The locale
350 supports full code-point sorting for all valid Unicode code points. A
351 limitation in the framework for fnmatch, regexec, and regcomp requires
352 a compromise to save space and only ASCII-based range expressions are
353 supported for now (see bug 28255). The full size of the locale is
354 only ~400KiB, with 346KiB coming from LC_CTYPE information for
355 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
356 in various downstream distributions. The locale is not built into
357 glibc, and must be installed.
359 * <math.h> functions that round their results to a narrower type, and
360 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
361 18661-3:2015 and draft ISO C2X:
363 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
364 fMxsqrtfN and fMxsqrtfNx functions.
366 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
369 * <math.h> functions for floating-point maximum and minimum,
370 corresponding to new operations in IEEE 754-2019, and corresponding
371 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
372 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
373 fminimum_mag, fminimum_mag_num and corresponding functions for float,
374 long double, _FloatN and _FloatNx.
376 * <math.h> macros for single-precision float constants are added as a
377 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
378 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
381 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
382 predefined as specified in TS 18661-1:2014.
384 * The exp10 functions in <math.h> now have a corresponding type-generic
387 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
389 * printf-family functions now support the %b format for output of
390 integers in binary, as specified in draft ISO C2X, and the %B variant
391 of that format recommended by draft ISO C2X.
393 * A new DSO sorting algorithm has been added in the dynamic linker that uses
394 topological sorting by depth-first search (DFS), solving performance issues
395 of the existing sorting algorithm when encountering particular circular
396 object dependency cases.
398 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
399 the two DSO sorting algorithms. The default setting of '2' uses the
400 new DFS-based algorithm. The setting '1' switches to the old
401 algorithm used in glibc 2.33 and earlier.
403 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
404 to be used by compilers for optimizing usage of 'memcmp' when its
405 return value is only used for its boolean status.
407 * Support for automatically registering threads with the Linux rseq
408 system call has been added. This system call is implemented starting
409 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
410 operations on per-cpu data. It allows user-space to perform updates
411 on per-cpu data without requiring heavy-weight atomic operations.
412 Automatically registering threads allows all libraries, including
413 libc, to make immediate use of the rseq support by using the
414 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
415 variables. The GNU C Library manual has details on integration of
416 Restartable Sequences.
418 * A symbolic link to the dynamic linker is now installed under
419 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
421 * All programs and the testsuite in glibc are now built as position independent
422 executables (PIE) by default on toolchains and architectures that support it.
423 Further, if the toolchain and architecture supports it, even static programs
424 are built as PIE and the resultant glibc can be used to build static PIE
425 executables. A new option --disable-default-pie has been added to disable
426 this behavior and get a non-PIE build. This option replaces
427 --enable-static-pie, which no longer has any effect on the build
430 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
431 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
432 or to use huge pages directly with mmap calls with the MAP_HUGETLB
433 flags). The former can improve performance when Transparent Huge Pages
434 is set to 'madvise' mode while the latter uses the system reserved
437 * The printf family of functions now handles the flagged %#m conversion
438 specifier, printing errno as an error constant (similar to strerrorname_np).
440 * The function _dl_find_object has been added. In-process unwinders
441 can use it to efficiently locate unwinding information for a code
444 * Support for OpenRISC running on Linux has been added. This port requires
445 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
450 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
451 64-bit file offsets (LFS default).
453 * A new configure option, --with-rtld-early-cflags, can be used to
454 specify additional compiler flags for building the early startup code
455 of the dynamic linker. On targets which have CPU compatibility
456 checks, this can help to ensure that proper diagnostics are printed if
457 the dynamic loader runs on an incompatible CPU.
459 * On Linux, the epoll_pwait2 function has been added. It is similar to
460 epoll_wait with the difference the timeout has nanoseconds resolution.
462 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
463 enabling posix_spawn and posix_spawnp to set the controlling terminal in
464 the new process in a race free manner. This function is a GNU extension.
466 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
467 applications compiling with glibc and gcc 12 and later. Level 3 leverages
468 the __builtin_dynamic_object_size function to deliver additional
469 fortification balanced against additional runtime cost (checking non-constant
472 * The audit libraries will avoid unnecessary slowdown if it is not required
473 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
475 Deprecated and removed features, and other changes affecting compatibility:
477 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
478 has been removed since the first PT_LOAD segment is no longer executable
479 due to defaulting to -z separate-code.
481 * The r_version update in the debugger interface makes the glibc binary
482 incompatible with GDB binaries built without the following commits:
484 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
485 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
487 when audit modules or dlmopen are used.
489 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
491 * The --enable-static-pie option is no longer available. The glibc build
492 configuration script now automatically detects static-pie support in the
493 toolchain and architecture and enables it if available.
495 * The catchsegv script and associated libSegFault.so shared object have
496 been removed. There are widely-deployed out-of-process alternatives for
497 catching coredumps and backtraces.
499 * Support for prelink will be removed in the next release; this includes
500 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
501 variables and their functionality in the dynamic loader.
503 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
504 functionality to obtain the program mapping address can be achieved by
505 using LD_TRACE_LOADED_OBJECTS to value of 2.
507 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
508 support prelink PIE binaries.
510 Changes to build and runtime requirements:
512 * The audit module interface version LAV_CURRENT is increased to enable
513 proper bind-now support. The loader now advertises via the la_symbind
514 flags that PLT trace is not possible. New audit modules require the
515 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
516 modules are still loaded for all targets except aarch64.
518 * The audit interface on aarch64 is extended to support both the indirect
519 result location register (x8) and NEON Q register. Old audit modules are
520 rejected by the loader. Audit modules must be rebuilt to use the newer
521 structure sizes and the latest module interface version for LAV_CURRENT.
523 Security related changes:
525 CVE-2022-23219: Passing an overlong file name to the clnt_create
526 legacy function could result in a stack-based buffer overflow when
527 using the "unix" protocol. Reported by Martin Sebor.
529 CVE-2022-23218: Passing an overlong file name to the svcunix_create
530 legacy function could result in a stack-based buffer overflow.
532 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
533 function could result in a memory leak and potential access of
534 uninitialized memory. Reported by Qualys.
536 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
537 function may result in an off-by-one buffer underflow and overflow
538 when the current working directory is longer than PATH_MAX and also
539 corresponds to the / directory through an unprivileged mount
540 namespace. Reported by Qualys.
542 The following bugs are resolved with this release:
544 [12889] nptl: Race condition in pthread_kill
545 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
546 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
547 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
549 [15333] libc: Use 64-bit stat functions in installed programs
550 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
552 [15971] dynamic-link: No interface for debugger access to libraries
554 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
555 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
556 deeply nested DSO dependencies.
557 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
558 ID whose lifetime has not ended
559 [22542] network: buffer overflow in sunrpc clnt_create
561 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
563 [25947] malloc: memory leak in muntrace
564 [26045] math: fmaxf(inf, nan) does not always work
565 [26108] math: exp10() has problems with <tgmath.h>
566 [26779] build: benign use after realloc at localealias.c:329
567 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
568 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
569 [27945] build: build-many-glibcs.py doesn't configure GCC with
570 --enable-initfini-array
571 [27991] build: x86: sysdeps/x86/configure.ac breaks when
572 libc_cv_include_x86_isa_level is loaded from cache
573 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
574 in __REDIRECT_NTH macro
575 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
576 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
578 [28126] libc: nftw aborts for paths longer than PATH_MAX
579 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
580 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
582 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
583 [28185] math: Inaccurate j0f function (again)
584 [28199] locale: iconvconfig prefix flag behaves differently in glibc
586 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
587 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
589 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
590 [28223] libc: mips: clone does not align stack
591 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
593 [28256] malloc: Conditional jump or move depends on uninitialised
594 value(s) in __GI___tunables_init
595 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
596 spawn5 fail if stray fds are open
597 [28310] libc: Do not use affinity mask for sysconf
598 (_SC_NPROCESSORS_CONF)
599 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
601 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
603 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
604 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
606 [28353] network: Race condition on __opensock
607 [28357] dynamic-link: deadlock between pthread_create and ctors
608 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
609 [28361] nptl: Fix for bug 12889 causes setxid deadlock
610 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
611 [28390] localedata: Update locale data to Unicode 14.0.0
612 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
614 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
616 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
617 to tgkill (getpid (), gettid())
618 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
619 [28457] dynamic-link: Missing reldepmod4.so dependency for
621 [28469] time: linux: struct timex is not correctly set for 32-bit
622 systems with TIMESIZE=64
623 [28470] regex: Buffer read overrun in regular expression searching
624 [28475] string: Incorrect access attribute on memfrob
625 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
626 spurious NUL character on state reset
627 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
629 [28550] dynamic-link: FAIL: tst-dso-
630 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
632 [28554] build: Undefined generate-md5
633 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
635 [28607] nptl: Masked signals are delivered on thread exit
636 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
637 lack of cpu counting /proc fallback with glibc 2.34
638 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
639 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
640 [28648] dynamic-link: Running ld.so on statically linked binaries
642 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
644 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
645 [28678] nptl: nptl/tst-create1 hangs sporadically
646 [28688] dynamic-link: PT_LOAD p_align check is too strict
647 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
649 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
650 timezones generated by tzcode-2021d and later
651 [28713] math: GCC 12 miscompiles libm
652 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
653 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
654 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
655 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
656 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
657 Assertion `GL(dl_rtld_map).l_libname' failed!
658 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
659 [28757] nptl: GDB printer tests failed with new GDB
660 [28765] math: x86_64 libmvec atan2 accuracy
661 [28766] manual: Document libmvec accuracy
662 [28768] network: Buffer overflow in svcunix_create with long pathnames
664 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
666 [28770] libc: Unexpected return value from realpath() for too long
667 results (CVE-2021-3998)
668 [28771] libc: %ebx optimization macros are incompatible with .altmacro
670 [28780] build: --disable-default-pie doesn't work on static programs
671 [28782] libc: x86-64 ISA level for glibc itself is always
673 [28792] glob: possible wrong behaviour with patterns with double [
675 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
676 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
677 empty mon_decimal_point_wc
684 * In order to support smoother in-place-upgrades and to simplify
685 the implementation of the runtime all functionality formerly
686 implemented in the libraries libpthread, libdl, libutil, libanl has
687 been integrated into libc. New applications do not need to link with
688 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
689 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
690 provided, so that the linker options keep working. Applications which
691 have been linked against glibc 2.33 or earlier continue to load the
692 corresponding shared objects (which are now empty). The integration
693 of those libraries into libc means that additional symbols become
694 available by default. This can cause applications that contain weak
695 references to take unexpected code paths that would only have been
696 used in previous glibc versions when e.g. preloading libpthread.so.0,
697 potentially exposing application bugs.
699 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
700 PTHREAD_STACK_MIN is no longer constant and is redefined to
701 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
702 sets for modern architectural features like Arm SVE.
704 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
705 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
706 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
707 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
708 dynamic sized register sets for modern architectural features like
711 * The dynamic linker implements the --list-diagnostics option, printing
712 a dump of information related to IFUNC resolver operation and
713 glibc-hwcaps subdirectory selection.
715 * On Linux, the function execveat has been added. It operates similar to
716 execve and it is is already used to implement fexecve without requiring
717 /proc to be mounted. However, different than fexecve, if the syscall is not
718 supported by the kernel an error is returned instead of trying a fallback.
720 * The ISO C2X function timespec_getres has been added.
722 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
723 C2X, is supported to enable declarations of functions defined in Annex F
724 of C2X. Those declarations are also enabled when
725 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
726 defined, and when _GNU_SOURCE is defined.
728 * On powerpc64*, glibc can now be compiled without scv support using the
729 --disable-scv configure option.
731 * Add support for 64-bit time_t on configurations like x86 where time_t
732 is traditionally 32-bit. Although time_t still defaults to 32-bit on
733 these configurations, this default may change in future versions.
734 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
735 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
736 only enabled for Linux and the full support requires a minimum kernel
739 * The main gconv-modules file in glibc now contains only a small set of
740 essential converter modules and the rest have been moved into a supplementary
741 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
742 in the same GCONV_PATH. Similarly, external converter modules directories
743 may have supplementary configuration files in a gconv-modules.d directory
744 with names ending with .conf to logically classify the converter modules in
747 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
748 to configure the size of the thread stack cache.
750 * The function _Fork has been added as an async-signal-safe fork replacement
751 since Austin Group issue 62 droped the async-signal-safe requirement for
752 fork (and it will be included in the future POSIX standard). The new _Fork
753 function does not run any atfork function neither resets any internal state
754 or lock (such as the malloc one), and only sets up a minimal state required
755 to call async-signal-safe functions (such as raise or execve). This function
756 is currently a GNU extension.
758 * On Linux, the close_range function has been added. It allows efficiently
759 closing a range of file descriptors on recent kernels (version 5.9).
761 * The function closefrom has been added. It closes all file descriptors
762 greater than or equal to a given integer. This function is a GNU extension,
763 although it is also present in other systems.
765 * The posix_spawn_file_actions_addclosefrom_np function has been added,
766 enabling posix_spawn and posix_spawnp to close all file descriptors greater
767 than or equal to a given integer. This function is a GNU extension,
768 although Solaris also provides a similar function.
770 * When invoked explicitly, the dynamic linker now uses the kernel to
771 execute programs that do not have any dynamic dependency (that is,
772 they are statically linked). This feature is Linux-specific.
774 Deprecated and removed features, and other changes affecting compatibility:
776 * The function pthread_mutex_consistent_np has been deprecated; programs
777 should use the equivalent standard function pthread_mutex_consistent
780 * The function pthread_mutexattr_getrobust_np has been deprecated;
781 programs should use the equivalent standard function
782 pthread_mutexattr_getrobust instead.
784 * The function pthread_mutexattr_setrobust_np has been deprecated;
785 programs should use the equivalent standard function
786 pthread_mutexattr_setrobust instead.
788 * The function pthread_yield has been deprecated; programs should use
789 the equivalent standard function sched_yield instead.
791 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
793 * Various rarely-used functions declared in <resolv.h> and
794 <arpa/nameser.h> have been deprecated. Applications are encouraged to
795 use dedicated DNS processing libraries if applicable. For <resolv.h>,
796 this affects the functions dn_count_labels, fp_nquery, fp_query,
797 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
798 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
799 p_type, putlong, putshort, res_hostalias, res_isourserver,
800 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
801 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
802 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
803 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
805 * Various symbols previously defined in libresolv have been moved to libc
806 in order to prepare for libresolv moving entirely into libc (see earlier
807 entry for merging libraries into libc). The symbols __dn_comp,
808 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
809 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
810 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
811 __res_search, __res_send formerly in libresolv have been renamed and no
812 longer have a __ prefix. They are now available in libc.
814 * The pthread cancellation handler is now installed with SA_RESTART and
815 pthread_cancel will always send the internal SIGCANCEL on a cancellation
816 request. It should not be visible to applications since the cancellation
817 handler should either act upon cancellation (if asynchronous cancellation
818 is enabled) or ignore the cancellation internal signal. However there are
819 buggy kernel interfaces (for instance some CIFS versions) that could still
820 see a spurious EINTR error when cancellation interrupts a blocking syscall.
822 * Previously, glibc installed its various shared objects under versioned
823 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
824 were provided as symbolic links. Starting with glibc 2.34, the shared
825 objects are installed under their ABI sonames directly, without
826 symbolic links. This increases compatibility with distribution
827 package managers that delete removed files late during the package
828 upgrade or downgrade process.
830 * The symbols mallwatch and tr_break are now deprecated and no longer used in
831 mtrace. Similar functionality can be achieved by using conditional
832 breakpoints within mtrace functions from within gdb.
834 * The __morecore and __after_morecore_hook malloc hooks and the default
835 implementation __default_morecore have been removed from the API. Existing
836 applications will continue to link against these symbols but the interfaces
837 no longer have any effect on malloc.
839 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
840 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
841 disabled by default in the main C library. Users looking to use these
842 features now need to preload a new debugging DSO libc_malloc_debug.so to get
843 this functionality back.
845 * The deprecated functions malloc_get_state and malloc_set_state have been
846 moved from the core C library into libc_malloc_debug.so. Legacy applications
847 that still use these functions will now need to preload libc_malloc_debug.so
848 in their environment using the LD_PRELOAD environment variable.
850 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
851 __memalign_hook and __free_hook are now removed from the API. Compatibility
852 symbols are present to support legacy programs but new applications can no
853 longer link to these symbols. These hooks no longer have any effect on glibc
854 functionality. The malloc debugging DSO libc_malloc_debug.so currently
855 supports hooks and can be preloaded to get this functionality back for older
856 programs. However this is a transitional measure and may be removed in a
857 future release of the GNU C Library. Users may port away from these hooks by
858 writing and preloading their own malloc interposition library.
860 Changes to build and runtime requirements:
862 * On Linux, the shm_open, sem_open, and related functions now expect the
863 file shared memory file system to be mounted at /dev/shm. These functions
864 no longer search among the system's mount points for a suitable
865 replacement if /dev/shm is not available.
867 Security related changes:
869 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
870 a request for netgroup lookup, may crash due to a double-free,
871 potentially resulting in degraded service or Denial of Service on the
872 local system. Reported by Chris Schanzle.
874 CVE-2021-33574: The mq_notify function has a potential use-after-free
875 issue when using a notification type of SIGEV_THREAD and a thread
876 attribute with a non-default affinity mask.
878 CVE-2021-35942: The wordexp function may overflow the positional
879 parameter number when processing the expansion resulting in a crash.
880 Reported by Philippe Antoine.
882 The following bugs are resolved with this release:
884 [4737] libc: fork is not async-signal-safe
885 [5781] math: Slow dbl-64 sin/cos/sincos for special values
886 [10353] libc: Methods for deleting all file descriptors greater than
887 given integer (closefrom)
888 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
889 name containing multi-byte character(s)
890 [14469] math: Inaccurate j0f function
891 [14470] math: Inaccurate j1f function
892 [14471] math: Inaccurate y0f function
893 [14472] math: Inaccurate y1f function
894 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
896 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
897 crashes if it fails dlsym() twice
898 [15648] nptl: multiple definition of `__lll_lock_wait_private'
899 [16063] nptl: Provide a pthread_once variant in libc directly
900 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
901 [17145] libc: syslog with LOG_CONS leaks console file descriptor
902 [17183] manual: description of ENTRY struct in <search.h> in glibc
904 [18435] nptl: pthread_once hangs when init routine throws an exception
905 [18524] nptl: Missing calloc error checking in
906 __cxa_thread_atexit_impl
907 [19329] dynamic-link: dl-tls.c assert failure at concurrent
908 pthread_create and dlopen
909 [19366] nptl: returning from a thread should disable cancellation
910 [19511] nptl: 8MB memory leak in pthread_create in case of failure
911 when non-root user changes priority
912 [20802] dynamic-link: getauxval NULL pointer dereference after static
914 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
915 [22057] malloc: malloc_usable_size is broken with mcheck
916 [22668] locale: LC_COLLATE: the last character of ellipsis is not
918 [23323] libc: [RFE] CSU startup hardening.
919 [23328] malloc: Remove malloc hooks and ensure related APIs return no
921 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
922 $PLATFORM, $ORIGIN) crashes
923 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
924 [23554] nptl: pthread_getattr_np reports wrong stack size with
926 [24106] libc: Bash interpreter in ldd script is taken from host
927 [24773] dynamic-link: dlerror in an secondary namespace does not use
928 the right free implementation
929 [25036] localedata: Update collation order for Swedish
930 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
931 shm_open to pick wrong directory
932 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
933 crash in IFUNC resolver due to stack canary (--enable-stack-
935 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
936 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
937 [27111] dynamic-link: pthread_create and tls access use link_map
938 objects that may be concurrently freed by dlclose
939 [27132] malloc: memusagestat is linked to system librt, leading to
940 undefined symbols on major version upgrade
941 [27136] dynamic-link: dtv setup at thread creation may leave an entry
943 [27249] libc: libSegFault.so does not output signal number properly
944 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
946 [27318] dynamic-link: glibc fails to load binaries when built with
947 -march=sandybridge: CPU ISA level is lower than required
948 [27343] nss: initgroups() SIGSEGVs when called on a system without
949 nsswich.conf (in a chroot)
950 [27346] dynamic-link: x86: PTWRITE feature check is missing
951 [27389] network: NSS chroot hardening causes regressions in chroot
953 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
954 [27444] libc: sysconf reports unsupported option (-1) for
955 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
956 [27462] nscd: double-free in nscd (CVE-2021-27645)
957 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
958 malloc/tst-malloc-thread-fail
959 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
960 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
962 [27522] glob: glob, glob64 incorrectly marked as __THROW
963 [27555] dynamic-link: Static tests fail with --enable-stack-
965 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
966 information for the current directory
967 [27577] dynamic-link: elf/ld.so --help doesn't work
968 [27605] libc: tunables can't control xsave/xsavec selection in
970 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
971 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
973 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
974 _nss_files_getcanonname_r) from within a dlmopen namespace.
975 [27648] libc: FAIL: misc/tst-select
976 [27650] stdio: vfscanf returns too early if a match is longer than
978 [27651] libc: Performance regression after updating to 2.33
979 [27655] string: Wrong size calculation in string/test-strnlen.c
980 [27706] libc: select fails to update timeout on error
981 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
982 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
983 tries resolving them lazily
984 [27744] nptl: Support different libpthread/ld.so load orders in
986 [27749] libc: Data race __run_exit_handlers
987 [27761] libc: getconf: Segmentation fault when passing '-vq' as
989 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
990 exceeds maximum object size 2147483647
991 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
993 [27872] build: Obsolete configure option --enable-stackguard-
995 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
996 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
997 [27892] libc: powerpc: scv ABI error handling fails to check
999 [27896] nptl: mq_notify does not handle separately allocated thread
1000 attributes (CVE-2021-33574)
1001 [27901] libc: TEST_STACK_ALIGN doesn't work
1002 [27902] libc: The x86-64 clone wrapper fails to align child stack
1003 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
1004 [27939] libc: aarch64: clone does not align the stack
1005 [27968] libc: s390x: clone does not align the stack
1006 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
1007 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1008 with n >= 0x80000000
1009 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1010 thread never allocated anything
1011 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1012 [28064] string: x86_64:wcslen implementation list has wcsnlen
1013 [28067] libc: FAIL: posix/tst-spawn5
1014 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1015 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1017 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1018 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1019 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1021 [28091] network: ns_name_skip may return 0 for domain names without
1029 * The dynamic linker accepts the --list-tunables argument which prints
1030 all the supported tunables. This option is disable if glibc is
1031 configured with tunables disabled (--enable-tunables=no).
1033 * The dynamic linker accepts the --argv0 argument and provides opportunity
1034 to change argv[0] string.
1036 * The dynamic linker loads optimized implementations of shared objects
1037 from subdirectories under the glibc-hwcaps directory on the library
1038 search path if the system's capabilities meet the requirements for
1039 that subdirectory. Initially supported subdirectories include
1040 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1041 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1042 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1043 subdirectory names correspond to the vendor-independent x86-64
1044 microarchitecture levels defined in the x86-64 psABI supplement.
1046 * The new --help option of the dynamic linker provides usage and
1047 information and library search path diagnostics.
1049 * The mallinfo2 function is added to report statistics as per mallinfo,
1050 but with larger field widths to accurately report values that are
1051 larger than fit in an integer.
1053 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1055 * Support for the RISC-V ISA running on Linux has been expanded to run on
1056 32-bit hardware. This is supported for the following ISA and ABI pairs:
1062 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1065 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1066 glibc may use additional checks that may have an additional performance
1067 overhead. At present these checks are available only on LLVM 9 and later.
1068 The latest GCC available at this time (10.2) does not support this level of
1071 Deprecated and removed features, and other changes affecting compatibility:
1073 * The mallinfo function is marked deprecated. Callers should call
1076 * When dlopen is used in statically linked programs, alternative library
1077 implementations from HWCAP subdirectories are no longer loaded.
1078 Instead, the default implementation is used.
1080 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1081 removed. To support old binaries, the vtimes function continues to exist
1082 as a compatibility symbol. Applications should use the getrlimit or
1085 * Following a change in the tzdata 2018a release upstream, the zdump
1086 program is now installed in the /usr/bin subdirectory. Previously,
1087 the /usr/sbin subdirectory was used.
1089 * On s390(x), the type float_t is now derived from the macro
1090 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1091 hardcoded to double. This does not affect the ABI of any libraries
1092 that are part of the GNU C Library, but may affect the ABI of other
1093 libraries that use this type in their interfaces. The new definition
1094 improves consistency with compiler behavior in many scenarios.
1096 * A future version of glibc will stop loading shared objects from the
1097 "tls" subdirectories on the library search path, the subdirectory that
1098 corresponds to the AT_PLATFORM system name, and also stop employing
1099 the legacy AT_HWCAP search mechanism. Applications should switch to
1100 the new glibc-hwcaps mechanism instead; if they do not do that, only
1101 the baseline version (directly from the search path directory) will be
1104 Changes to build and runtime requirements:
1106 * On Linux, the system administrator needs to configure /dev/pts with
1107 the intended access modes for pseudo-terminals. glibc no longer
1108 attemps to adjust permissions of terminal devices. The previous glibc
1109 defaults ("tty" group, user read/write and group write) already
1110 corresponded to what most systems used, so that grantpt did not
1111 perform any adjustments.
1113 * On Linux, the posix_openpt and getpt functions no longer attempt to
1114 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1115 (and pseudo-terminals are supported), a devpts file system is mounted
1116 on /dev/pts. Current systems already meet these requirements.
1118 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1120 Security related changes:
1122 CVE-2021-3326: An assertion failure during conversion from the
1123 ISO-20220-JP-3 character set using the iconv function has been fixed.
1124 This assertion was triggered by certain valid inputs in which the
1125 converted output contains a combined sequence of two wide characters
1126 crossing a buffer boundary. Reported by Tavis Ormandy.
1128 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1129 invoked with input containing redundant shift sequences in the IBM1364,
1130 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1132 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1133 when invoked with UCS4 input containing an invalid character.
1135 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1136 invoked with EUC-KR input containing invalid multibyte input sequences.
1138 The following bugs are resolved with this release:
1140 [10635] libc: realpath portability patches
1141 [16124] dynamic-link: ld.so should allow to change argv[0]
1142 [17924] malloc: 'free' should not set errno
1143 [18683] libc: Linux faccessat implementation can incorrectly ignore
1145 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1146 [23091] hurd: missing waitid support
1147 [23249] libc: Epyc and other current AMD CPUs do not select the
1148 "haswell" platform subdirectory
1149 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1151 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1153 [24941] libc: Make grantpt usable after multi-threaded fork in more
1155 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1156 [24973] locale: iconv encounters segmentation fault when converting
1157 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1158 [25399] string: undefined reference to `__warn_memset_zero_len' when
1159 changing gnuc version
1160 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1162 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1164 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1165 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1166 [26100] libc: Race in syslog(3) with regards to tag printing.
1167 [26124] libc: Export <cpu-features.h>
1168 [26130] nscd: Inconsistent nscd cache during pruning
1169 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1170 [26224] locale: iconv hangs when converting some invalid inputs from
1171 several IBM character sets (CVE-2020-27618)
1172 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1173 too much stack space
1174 [26343] manual: invalid documented return type for strerrorname_np(),
1175 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1176 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1178 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1180 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1181 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1183 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1184 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1185 [26555] string: strerrorname_np does not return the documented value
1186 [26592] libc: pointer arithmetic overflows in realpath
1187 [26600] network: Transaction ID collisions cause slow DNS lookups in
1189 [26606] libc: [2.33 Regression] pselect is broken on x32
1190 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1191 [26620] glob: fnmatch with collating symbols results in segmentation
1193 [26625] libc: [2.33 Regression] CET is disabled
1194 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1195 at the end of a memory mapping
1196 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1197 by the caller to the kernel
1198 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1199 [26647] build: [-Werror=array-parameter=] due to different
1200 declarations for __sigsetjmp
1201 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1203 [26649] stdio: printf should handle non-normal x86 long double numbers
1204 gracefully (CVE-2020-29573)
1205 [26686] build: -Warray-parameter instances building with GCC 11
1206 [26687] build: -Warray-bounds instances building with GCC 11
1207 [26690] stdio: Aliasing violation in __vfscanf_internal
1208 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1209 [26726] build: GCC warning calling new_composite_name with an array of
1211 [26736] libc: FAIL: misc/tst-sysvshm-linux
1212 [26737] libc: Random FAIL: rt/tst-shm
1213 [26791] libc: Missing O_CLOEXEC in sysconf.c
1214 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1216 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1218 [26818] string: aarch64: string tests may run ifunc variants that are
1220 [26821] libc: Memory leak test failures on Fedora 33
1221 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1222 FSGSBASE/LM/RDRAND check failure
1223 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1225 [26853] libc: aarch64: Missing unwind information in statically linked
1227 [26923] locale: Assertion failure in iconv when converting invalid
1228 UCS4 (CVE-2020-29562)
1229 [26926] dynamic-link: aarch64: library dependencies are not bti
1231 [26932] libc: sh: Multiple floating point functions defined as stubs
1233 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1235 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1237 [27002] build: libc_freeres_fn build failure with GCC 11
1238 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1239 [27008] dynamic-link: ld.so.cache should have endianness markup
1240 [27042] libc: [alpha] anonymous union in struct stat confuses
1242 [27053] libc: Conformance regression in system(3) (and probably also
1244 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1246 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1247 [27083] libc: Unsafe unbounded alloca in addmntent
1248 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1250 [27130] string: "rep movsb" performance issue
1251 [27150] libc: alpha: wait4() is unavailable in static linking
1252 [27177] dynamic-link:
1253 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1255 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1256 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1257 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1258 related to combining characters (CVE-2021-3326)
1265 * Unicode 13.0.0 Support: Character encoding, character type info, and
1266 transliteration tables are all updated to Unicode 13.0.0, using
1267 generator scripts contributed by Mike FABIAN (Red Hat).
1269 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1271 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1272 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1273 Three ABIs are supported:
1279 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1280 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1282 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1283 DT_DEPAUDIT dynamic section entries of the main executable.
1285 * powerpc64le supports IEEE128 long double libm/libc redirects when
1286 using -mabi=ieeelongdouble to compile C code on supported GCC
1287 toolchains. It is recommended to use GCC 8 or newer when testing
1290 * To help detect buffer overflows and other out-of-bounds accesses
1291 several APIs have been annotated with GCC 'access' attribute. This
1292 should help GCC 10 issue better warnings.
1294 * On Linux, functions pthread_attr_setsigmask_np and
1295 pthread_attr_getsigmask_np have been added. They allow applications
1296 to specify the signal mask of a thread created with pthread_create.
1298 * The GNU C Library now provides the header file <sys/single_threaded.h>
1299 which declares the variable __libc_single_threaded. Applications are
1300 encouraged to use this variable for single-thread optimizations,
1301 instead of weak references to symbols historically defined in
1304 * The functions sigabbrev_np and sigdescr_np have been added. The
1305 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1306 SIGHUP) while sigdescr_np returns a string describing the signal number
1307 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1308 attempt to translate the return description, both functions return
1309 NULL for an invalid signal number.
1311 They should be used instead of sys_siglist or sys_sigabbrev and they
1312 are both thread and async-signal safe. These functions are GNU extensions.
1314 * The functions strerrorname_np and strerrordesc_np have been added. The
1315 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1316 while strerrordesc_np returns a string describing the error number
1317 (e.g "Invalid argument" for EINVAL). Different than strerror,
1318 strerrordesc_np does not attempt to translate the return description, both
1319 functions return NULL for an invalid error number.
1321 They should be used instead of sys_errlist and sys_nerr, both are
1322 thread and async-signal safe. These functions are GNU extensions.
1324 * AArch64 now supports standard branch protection security hardening
1325 in glibc when it is built with a GCC that is configured with
1326 --enable-standard-branch-protection (or if -mbranch-protection=standard
1327 flag is passed when building both GCC target libraries and glibc,
1328 in either case a custom GCC is needed). This includes branch target
1329 identification (BTI) and pointer authentication for return addresses
1330 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1331 extensions respectively for the protection to be effective,
1332 otherwise the used instructions are nops. User code can use PAC-RET
1333 without libc support, but BTI requires a libc that is built with BTI
1334 support, otherwise runtime objects linked into user code will not be
1337 Deprecated and removed features, and other changes affecting compatibility:
1339 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1340 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1341 RPC header files. Backward compatibility for old programs is kept
1342 only for architectures and ABIs that have been added in or before
1343 glibc 2.31. New programs need to use TI-RPC
1344 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1345 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1347 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1348 as shared library for backward compatibility and the NSS modules "nis"
1349 and "nisplus" are not built at all and libnsl's headers aren't
1350 installed. This compatibility is kept only for architectures and ABIs
1351 that have been added in or before version 2.28. Replacement
1352 implementations based on TI-RPC, which additionally support IPv6, are
1353 available from <https://github.com/thkukuk/>. This change does not
1354 affect the "compat" NSS module, which does not depend on libnsl
1355 since 2.27 and thus can be used without NIS.
1357 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1358 removed. To support old binaries, the sysctl function continues to
1359 exist as a compatibility symbol (on those architectures which had it),
1360 but always fails with ENOSYS. This reflects the removal of the system
1361 call from all architectures, starting with Linux 5.5.
1363 * The sstk function is no longer available to newly linked binaries.
1364 Its implementation always returned with a failure, and the function
1365 was not declared in any header file.
1367 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1368 sigrelse, sigignore and sigset, and the sigmask macro have been
1369 deprecated. Applications should use the sigsuspend, sigprocmask and
1370 sigaction functions instead.
1372 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1373 already supported this format for almost 20 years.
1375 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1376 are no longer available to newly linked binaries, and their declarations
1377 have been removed from <string.h>. They are exported solely as
1378 compatibility symbols to support old binaries. All programs should use
1381 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1382 are no longer available to newly linked binaries, and their declarations
1383 have been removed from <stdio.h>. They are exported solely as
1384 compatibility symbols to support old binaries. All programs should use
1385 strerror or strerror_r instead.
1387 * Both strerror and strerror_l now share the same internal buffer in the
1388 calling thread, meaning that the returned string pointer may be invalided
1389 or contents might be overwritten on subsequent calls in the same thread or
1390 if the thread is terminated. It makes strerror MT-safe.
1392 * Using weak references to libpthread functions such as pthread_create
1393 or pthread_key_create to detect the singled-threaded nature of a
1394 program is an obsolescent feature. Future versions of glibc will
1395 define pthread_create within libc.so.6 itself, so such checks will
1396 always flag the program as multi-threaded. Applications should check
1397 the __libc_single_threaded variable declared in
1398 <sys/single_threaded.h> instead.
1400 * The "files" NSS module no longer supports the "key" database (used for
1401 secure RPC). The contents of the /etc/publickey file will be ignored,
1402 regardless of the settings in /etc/nsswitch.conf. (This method of
1403 storing RPC keys only supported the obsolete and insecure AUTH_DES
1404 flavor of secure RPC.)
1406 * The __morecore and __after_morecore_hook malloc hooks and the default
1407 implementation __default_morecore have been deprecated. Applications
1408 should use malloc interposition to change malloc behavior, and mmap to
1409 allocate anonymous memory. A future version of glibc may require that
1410 applications which use the malloc hooks must preload a special shared
1411 object, to enable the hooks.
1413 * The hesiod NSS module has been deprecated and will be removed in a
1414 future version of glibc. System administrators are encouraged to
1415 switch to other approaches for networked account databases, such as
1418 Changes to build and runtime requirements:
1420 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1421 long double redirects.
1423 Security related changes:
1425 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1426 invoked with the -c option and when processing invalid multi-byte input
1427 sequences. Reported by Jan Engelhardt.
1429 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1430 corruption when they were passed a pseudo-zero argument. Reported by Guido
1431 Vranken / ForAllSecure Mayhem.
1433 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1434 expanding ~user has been fixed.
1436 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1437 memmove functions has been fixed. Discovered by Jason Royes and Samual
1438 Dytrych of the Cisco Security Assessment and Penetration Team (See
1441 The following bugs are resolved with this release:
1443 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1444 [10441] manual: Backtraces code example lacks error checking
1445 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1446 timer_sigev_thread dangerous
1447 [14231] stdio: stdio-common tests memory requirements
1448 [14578] libc: /proc-based emulation for lchmod, fchmodat
1449 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1450 filtee has constructor
1451 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1452 sequences (CVE-2016-10228)
1453 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1454 character entities for infinity & pi
1455 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1456 segfaults in applications
1457 [20543] libc: Please move from .gnu.linkonce to comdat
1458 [22489] network: gcc warns about implicit convertion in
1459 ICMP6_FILTER_SETPASS with -Wsign-conversion
1460 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1461 [23294] math: Complex _FloatN functions are redirected to the wrong
1462 function with -mlong-double-64
1463 [23296] libc: Data race in setting function descriptor during lazy
1465 [23668] dynamic-link: ldconfig: Default to the new format for
1467 [23819] hurd: hurd: Add C11 thread support
1468 [23990] build: test-container error out on failure to exec child.
1469 [23991] build: shell-container typo in run_command_array
1470 [24638] manual: Error in example of parsing a template string
1471 [24654] manual: Wrong declaration of wcschr in libc manual
1472 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1474 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1475 dynamically loaded dsos
1476 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1477 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1479 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1480 restore EAX, ECX and EDX
1481 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1482 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1483 [25420] network: Race condition in resolv_conf.c can result in caching
1484 stale configuration forever
1485 [25487] math: sinl() stack corruption from crafted input
1487 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1489 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1490 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1492 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1493 on 32 bit and old kernel
1494 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1495 [25639] localedata: Some names of days and months wrongly spelt in
1497 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1498 amount of sigset_t bytes
1499 [25691] stdio: printf: memory leak when printing long multibyte
1501 [25715] libc: system() returns wrong errors when posix_spawn fails
1502 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1503 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1504 state for conversions that produce two Unicode code points
1505 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1506 for linux x86_64 leads to livelock
1507 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1508 test failures, invalid instruction in ld.so
1509 [25790] glob: Typo in tst-fnmatch.input
1510 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1512 [25819] localedata: Update locale data to Unicode 13.0.0
1513 [25824] libc: Abnormal function of strnlen in aarch64
1514 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1515 [25896] libc: Incorrect prctl
1516 [25902] libc: Bad LOADARGS_N
1517 [25905] dynamic-link: VSX registers are corrupted during PLT
1518 resolution when glibc is built with --disable-multi-arch and --with-
1520 [25933] string: Off by one error in __strncmp_avx2 when
1521 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1523 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1524 exiting detached thread
1525 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1527 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1529 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1530 [26073] math: getpayload() has wrong return value
1531 [26076] dynamic-link: dlmopen crashes after failing to load
1532 dependencies in audit mode
1533 [26120] localedata: column width of of some Korean
1534 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1535 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1536 [26133] libc: Incorrect need_arch_feature_F16C
1537 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1539 [26149] libc: PKU is usable only if OSPKE is set
1540 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1542 [26208] libc: Incorrect bit_cpu_CLFSH
1543 [26210] network: Incorrect use of hidden symbols for global sunrpc
1545 [26211] stdio: printf integer overflow calculating allocation size
1546 [26214] stdio: printf_fp double free
1547 [26215] stdio: printf_fp memory leak
1548 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1549 [26258] nss: nss_compat should not read input files with mmap
1550 [26332] string: Incorrect cache line size load causes memory
1551 corruption in memset
1558 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1559 enable features from the draft ISO C2X standard. Only some features from
1560 this draft standard are supported by the GNU C Library, and as the draft
1561 is under active development, the set of features enabled by this macro is
1562 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1563 by compiling with "gcc -std=gnu2x".
1565 * The <math.h> functions that round their results to a narrower type now
1566 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1567 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1568 Clarification Request 13 to TS 18661-3.
1570 * The function pthread_clockjoin_np has been added, enabling join with a
1571 terminated thread with a specific clock. It allows waiting against
1572 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1574 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1576 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1577 in queries if the trust-ad option is set via the options directive in
1578 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1579 mode, the AD bit, as provided by the name server, is available to
1580 applications which call res_search and related functions. In the default
1581 mode, the AD bit is not set in queries, and it is automatically cleared in
1582 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1583 servers and the network path to them are treated as untrusted.)
1585 Deprecated and removed features, and other changes affecting compatibility:
1587 * The totalorder and totalordermag functions, and the corresponding
1588 functions for other floating-point types, now take pointer arguments to
1589 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1590 passing. This is in accordance with the resolution of Clarification
1591 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1592 floating-point arguments directly will continue to work.
1594 * The obsolete function stime is no longer available to newly linked
1595 binaries, and its declaration has been removed from <time.h>.
1596 Programs that set the system time should use clock_settime instead.
1598 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1599 in a future version of glibc. In this release, the header still exists
1600 but calling ftime will cause a compiler warning. All programs should use
1601 gettimeofday or clock_gettime instead.
1603 * The gettimeofday function no longer reports information about a
1604 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1605 many years, as it cannot handle the full complexity of the world's
1606 timezones, but hitherto we have supported it on a best-effort basis.
1607 Changes required to support 64-bit time_t on 32-bit architectures have
1608 made this no longer practical.
1610 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1611 should expect to receive a 'struct timezone' whose tz_minuteswest and
1612 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1613 happen on a few Linux-based ports. This will be corrected in a future
1616 All callers should supply a null pointer for the 'tzp' argument to
1617 gettimeofday. For accurate information about the time zone associated
1618 with the current time, use the localtime function.
1620 gettimeofday itself is obsolescent according to POSIX. We have no plans
1621 to remove access to this function, but portable programs should consider
1622 using clock_gettime instead.
1624 * The settimeofday function can still be used to set a system-wide time
1625 zone when the operating system supports it. This is because the Linux
1626 kernel reused the API, on some architectures, to describe a system-wide
1627 time-zone-like offset between the software clock maintained by the kernel,
1628 and the "RTC" clock that keeps time when the system is shut down.
1630 However, to reduce the odds of this offset being set by accident,
1631 settimeofday can no longer be used to set the time and the offset
1632 simultaneously. If both of its two arguments are non-null, the call
1633 will fail (setting errno to EINVAL).
1635 Callers attempting to set this offset should also be prepared for the call
1636 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1637 some Linux architectures. The Linux kernel maintainers are discussing a
1638 more principled replacement for the reused API. After a replacement
1639 becomes available, we will change settimeofday to fail with ENOSYS on all
1640 platforms when its 'tzp' argument is not a null pointer.
1642 settimeofday itself is obsolescent according to POSIX. Programs that set
1643 the system time should use clock_settime and/or the adjtime family of
1644 functions instead. We may cease to make settimeofday available to newly
1645 linked binaries after there is a replacement for Linux's time-zone-like
1648 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1649 the optional CAS instruction is implemented (for instance, LEON processors
1650 are still supported, but SuperSPARC processors are not).
1652 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1655 * If a lazy binding failure happens during dlopen, during the execution of
1656 an ELF constructor, the process is now terminated. Previously, the
1657 dynamic loader would return NULL from dlopen, with the lazy binding error
1658 captured in a dlerror message. In general, this is unsafe because
1659 resetting the stack in an arbitrary function call is not possible.
1661 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1662 executable stack unless explicitly configured at build time to require
1663 minimum kernel version 4.8 or newer. This is because executing
1664 floating-point branches on a non-executable stack on Linux kernels prior to
1665 4.8 can lead to application crashes for some MIPS configurations. While
1666 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1667 expected to enable non-executable stack by default with PT_GNU_STACK by
1668 default and is thus likely to trigger a crash on older kernels.
1670 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1671 non-executable stack while dropping support for older kernels.
1673 * System call wrappers for time system calls now use the new time64 system
1674 calls when available. On 32-bit targets, these wrappers attempt to call
1675 the new system calls first and fall back to the older 32-bit time system
1676 calls if they are not present. This may cause issues in environments
1677 that cannot handle unsupported system calls gracefully by returning
1678 -ENOSYS. Seccomp sandboxes are affected by this issue.
1680 Changes to build and runtime requirements:
1682 * It is no longer necessary to have recent Linux kernel headers to build
1683 working (non-stub) system call wrappers on all architectures except 64-bit
1684 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1686 * The ChangeLog file is no longer present in the toplevel directory of the
1687 source tree. ChangeLog files are located in the ChangeLog.old directory as
1688 ChangeLog.N where the highest N has the latest entries.
1690 Security related changes:
1692 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1693 out-of-bounds write when executed in a signal frame context.
1695 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1696 environment variable during program execution after a security
1697 transition, allowing local attackers to restrict the possible mapping
1698 addresses for loaded libraries and thus bypass ASLR for a setuid
1699 program. Reported by Marcin Kościelnicki.
1701 The following bugs are resolved with this release:
1703 [12031] localedata: iconv -t ascii//translit with Greek characters
1704 [15813] libc: Multiple issues in __gen_tempname
1705 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1706 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1707 [19767] libc: vdso is not used with static linking
1708 [19903] hurd: Shared mappings not being inherited by children processes
1709 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1710 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1712 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1713 Symbols-A/B Unicode blocks
1714 [23518] libc: Eliminate __libc_utmp_jump_table
1715 [24026] malloc: malloc_info() returns wrong numbers
1716 [24054] localedata: Many locales are missing date_fmt
1717 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1718 [24304] dynamic-link: Lazy binding failure during ELF
1719 constructors/destructors is not fatal
1720 [24376] libc: RISC-V symbol size confusion with _start
1721 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1723 [24824] libc: test-in-container does not install charmap files compatible
1725 [24844] regex: regex bad pointer / leakage if malloc fails
1726 [24867] malloc: Unintended malloc_info formatting changes
1727 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1728 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1729 [24882] libc: login: pututline uses potentially outdated cache
1730 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1731 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1733 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1735 [24930] dynamic-link: dlopen of PIE executable can result in
1736 _dl_allocate_tls_init assertion failure
1737 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1738 (stringop-overflow error)
1739 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1740 functions other can lead to crashes
1741 [24967] libc: jemalloc static linking causes runtime failure
1742 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1744 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1745 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1746 [25097] libc: new -Warray-bounds with GCC 10
1747 [25112] dynamic-link: dlopen must not make new objects accessible when it
1748 still can fail with an error
1749 [25139] localedata: Please add the new mnw_MM locale
1750 [25149] regex: Array bounds violation in proceed_next_node
1751 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1752 initialized correctly
1753 [25189] libc: glibc's __glibc_has_include causes issues with clang
1755 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1756 value to an unsigned
1757 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1758 binaries (CVE-2019-19126)
1759 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1761 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1763 [25232] string: <string.h> does not enable const correctness for strchr et
1765 [25233] localedata: Consider "." as the thousands separator for sl_SI
1767 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1768 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1769 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1771 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1772 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1774 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1775 (dl_initfirst) link map pointer
1776 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1777 [25423] libc: Array overflow in backtrace on powerpc
1778 [25425] network: Missing call to __resolv_context_put in
1779 getaddrinfo.c:gethosts
1786 * Unicode 12.1.0 Support: Character encoding, character type info, and
1787 transliteration tables are all updated to Unicode 12.1.0, using
1788 generator scripts contributed by Mike FABIAN (Red Hat).
1790 * The dynamic linker accepts the --preload argument to preload shared
1791 objects, in addition to the LD_PRELOAD environment variable.
1793 * The twalk_r function has been added. It is similar to the existing
1794 twalk function, but it passes an additional caller-supplied argument
1795 to the callback function.
1797 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1799 * Minguo (Republic of China) calendar support has been added as an
1800 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1803 * The entry for the new Japanese era has been added for ja_JP locale.
1805 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1806 pvalloc, memalign, and posix_memalign fail now with total object size
1807 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1808 pointer subtraction within the allocated object, where results might
1809 overflow the ptrdiff_t type.
1811 * The dynamic linker no longer refuses to load objects which reference
1812 versioned symbols whose implementation has moved to a different soname
1813 since the object has been linked. The old error message, symbol
1814 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1815 link time reference, is gone.
1817 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1818 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1819 functions. These behave similarly to their "timed" equivalents, but also
1820 accept a clockid_t parameter to determine which clock their timeout should
1821 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1822 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1823 time of the wait (unlike with pthread_condattr_setclock, which requires
1824 the clock choice at initialization time).
1826 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1827 work, new resolvers can use a second argument which can be extended in
1828 the future, currently it contains the AT_HWCAP2 value.
1830 Deprecated and removed features, and other changes affecting compatibility:
1832 * The copy_file_range function fails with ENOSYS if the kernel does not
1833 support the system call of the same name. Previously, user space
1834 emulation was performed, but its behavior did not match the kernel
1835 behavior, which was deemed too confusing. Applications which use the
1836 copy_file_range function can no longer rely on glibc to provide a fallback
1837 on kernels that do not support the copy_file_range system call, and if
1838 this function returns ENOSYS, they will need to use their own fallback.
1839 Support for copy_file_range for most architectures was added in version
1840 4.5 of the mainline Linux kernel.
1842 * The functions clock_gettime, clock_getres, clock_settime,
1843 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1844 for new applications (on architectures which had them). Instead, the
1845 definitions in libc will be used automatically, which have been available
1848 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1849 and <sys/stropts.h> have been removed.
1851 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1852 resolver flag (deprecated in glibc 2.25) have been removed.
1854 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1855 resolver have been removed from <resolv.h>.
1857 * With --enable-bind-now, installed programs are now linked with the
1860 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1861 configurations) has been removed, following the deprecation of this
1862 subarchitecture in version 8 of GCC, and its removal in version 9.
1864 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1865 header have been removed.
1867 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1868 deprecated and will be removed from a future version of glibc.
1869 Application should directly access /proc instead. For obtaining random
1870 bits, the getentropy function can be used.
1872 Changes to build and runtime requirements:
1874 * GCC 6.2 or later is required to build the GNU C Library.
1876 Older GCC versions and non-GNU compilers are still supported when
1877 compiling programs that use the GNU C Library.
1879 Security related changes:
1881 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1882 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1883 has undefined behavior. On x32, the size_t argument may be passed
1884 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1885 32 bits. When it happened with the sign bit of RDX register set,
1886 memcmp gave the wrong result since it treated the size argument as
1887 zero. Reported by H.J. Lu.
1889 CVE-2019-9169: Attempted case-insensitive regular-expression match
1890 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1891 over-read. Reported by Hongxu Chen.
1893 The following bugs are resolved with this release:
1895 [2872] locale: Transliteration Cyrillic -> ASCII fails
1896 [6399] libc: gettid() should have a wrapper
1897 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1898 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1899 [17396] localedata: globbing for locale by [[.collating-element.]]
1900 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1901 [18465] malloc: memusagestat is built using system C library
1902 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1903 invalid input drops valid char
1904 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1905 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1906 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1907 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1908 [23352] malloc: __malloc_check_init still defined in public header
1910 [23403] nptl: Wrong alignment of TLS variables
1911 [23501] libc: nftw() doesn't return dangling symlink's inode
1912 [23733] malloc: Check the count before calling tcache_get()
1913 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1915 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1916 [23844] nptl: pthread_rwlock_trywrlock results in hang
1917 [23983] argparse: Missing compat versions of argp_failure and argp_error
1918 for long double = double
1919 [23984] libc: Missing compat versions of err.h and error.h functions for
1920 long double = double
1921 [23996] localedata: Dutch salutations
1922 [24040] libc: riscv64: unterminated call chain in __thread_start
1923 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1925 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1926 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1928 [24114] regex: regexec buffer read overrun in "grep -i
1929 '\(\(\)*.\)*\(\)\(\)\1'"
1930 [24122] libc: Segfaults if 0 returned from la_version
1931 [24153] stdio: Some input functions do not react to stdin assignment
1932 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1933 RDX is set) (CVE-2019-7309)
1934 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1935 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1936 not the default "nor"
1937 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1938 false positives, change to modern flexible array
1939 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1940 instructions while maintaining the robust mutex list due to missing
1942 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1943 unnecessary librt dependencies
1944 [24200] localedata: Revert first_weekday removal in en_IE locale
1945 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1946 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1947 [24216] malloc: Check for large bin list corruption when inserting
1949 [24228] stdio: old x86 applications that use legacy libio crash on exit
1950 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1952 [24293] localedata: Missing Minguo calendar support for TW locales
1953 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1954 tt_RU (Tatar) locale
1955 [24307] localedata: Update locale data to Unicode 12.0.0
1956 [24323] dynamic-link: dlopen should not be able open PIE objects
1957 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1958 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1959 tt_RU (Tatar) locale
1960 [24370] localedata: Add lang_name for tt_RU locale
1961 [24372] locale: Binary locale files are not architecture independent
1962 [24394] time: strptime %Ey mis-parses final year of era
1963 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1965 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1967 [24531] malloc: Malloc tunables give tcache assertion failures
1968 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1970 [24535] localedata: Update locale data to Unicode 12.1.0
1971 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1972 kernels and break testing
1973 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1974 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1975 [-Werror=format-overflow=]
1976 [24570] libc: alpha: compat msgctl uses __IPC_64
1977 [24584] locale: Data race in __wcsmbs_clone_conv
1978 [24588] stdio: Remove codecvt vtables from libio
1979 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1981 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1982 [24632] stdio: Old binaries which use freopen with default stdio handles
1984 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1986 [24652] localedata: szl_PL spelling correction
1987 [24695] nss: nss_db: calling getpwent after endpwent crashes
1988 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1989 in /etc/nsswitch.conf
1990 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1991 [24740] libc: getdents64 type confusion
1992 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1993 always implemented in the same library
1994 [24744] libc: Remove copy_file_range emulation
1995 [24757] malloc: memusagestat is linked against system libpthread
1996 [24794] libc: Partial test suite run builds corrupt test-in-container
2004 * The getcpu wrapper function has been added, which returns the currently
2005 used CPU and NUMA node. This function is Linux-specific.
2007 * A new convenience target has been added for distribution maintainers
2008 to build and install all locales as directories with files. The new
2009 target is run by issuing the following command in your build tree:
2010 'make localedata/install-locale-files', with an optional DESTDIR
2011 to set the install root if you wish to install into a non-default
2012 configured location.
2014 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2016 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2017 for _GNU_SOURCE, to match BSD environments.
2019 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2020 indicates that it will abort the transaction prior to entering the kernel
2021 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2022 suspended, and this caused some undefined side-effects issues by aborting
2023 transactions manually. Glibc avoided it by abort transactions manually on
2024 each syscall, but it lead to performance issues on newer kernels where the
2025 HTM state is saved and restore lazily (the state being saved even when the
2026 process actually does not use HTM).
2028 * The functions posix_spawn_file_actions_addchdir_np and
2029 posix_spawn_file_actions_addfchdir_np have been added, enabling
2030 posix_spawn and posix_spawnp to run the new process in a different
2031 directory. These functions are GNU extensions. The function
2032 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2035 * The popen and system do not run atfork handlers anymore (BZ#17490).
2036 Although it is a possible POSIX violation, the POSIX rationale in
2037 pthread_atfork documentation regarding atfork handlers is to handle
2038 inconsistent mutex state after a fork call in a multi-threaded process.
2039 In both popen and system there is no direct access to user-defined mutexes.
2041 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2042 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2044 - C-SKY ABIV2 soft-float little-endian
2045 - C-SKY ABIV2 hard-float little-endian
2047 * strftime's default formatting of a locale's alternative year (%Ey)
2048 has been changed to zero-pad the year to a minimum of two digits,
2049 like "%y". This improves the display of Japanese era years during
2050 the first nine years of a new era, and is expected to be harmless
2051 for all other locales (only Japanese locales regularly have
2052 alternative year numbers less than 10). Zero-padding can be
2053 overridden with the '_' or '-' flags (which are GNU extensions).
2055 * As a GNU extension, the '_' and '-' flags can now be applied to
2056 "%EY" to control how the year number is formatted; they have the
2057 same effect that they would on "%Ey".
2059 Deprecated and removed features, and other changes affecting compatibility:
2061 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2062 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2064 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2065 in <sys/procfs.h>, has been corrected to match the type actually used by
2066 the Linux kernel. This affects the size and layout of that structure on
2067 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2069 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2070 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2071 defined in <sys/procfs.h>, has been corrected to match the type actually
2072 used by the Linux kernel. This affects the size and layout of those
2075 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2076 meant to scan a string and allocate space for it with malloc, is now
2077 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2078 defined. This extension conflicts with C99's use of '%a' to scan a
2079 hexadecimal floating-point number, which is now available to programs
2080 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2082 POSIX.1-2008 includes the feature of allocating a buffer for string input
2083 with malloc, using the modifier letter 'm' instead. Programs using
2084 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2085 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2086 C99 '%a' no longer need to avoid _GNU_SOURCE.
2088 GCC's -Wformat warnings can detect most uses of this extension, as long
2089 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2090 __attribute__ ((format (scanf, ...))).
2092 Changes to build and runtime requirements:
2094 * Python 3.4 or later is required to build the GNU C Library.
2096 * On most architectures, GCC 5 or later is required to build the GNU C
2097 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2099 Older GCC versions and non-GNU compilers are still supported when
2100 compiling programs that use the GNU C Library.
2102 Security related changes:
2104 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2105 denial of service due to resource exhaustion when processing getaddrinfo
2106 calls with crafted host names. Reported by Guido Vranken.
2108 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2109 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2110 happened, accessing the 32-bit size_t value as the full 64-bit register
2111 in the assembly string/memory functions would cause a buffer overflow.
2112 Reported by H.J. Lu.
2114 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2115 addresses with arbitrary trailing characters, potentially leading to data
2116 or command injection issues in applications.
2118 The following bugs are resolved with this release:
2120 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2121 [10496] localedata: 12h time representation in multiple locales faulty
2122 [10797] localedata: it_IT locale numeric does not have a separator for
2124 [11319] libc: dprintf doesn't handle errors properly
2125 [16346] time: mktime: potentially unsafe use of localtime_offset
2126 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2128 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2129 posix_spawn_file_actions_addfchdir_np
2130 [17426] localedata: Indian locales: set the correct date format
2131 [17490] stdio: popen should not invoke atfork handlers
2132 [17783] libc: TIOCSER_TEMT conditions inconsistent
2133 [18040] regex: use-after-free in regexec/get_subexp
2134 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2135 [20018] network: getaddrinfo should reject IP addresses with trailing
2136 characters (CVE-2016-10739)
2137 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2138 [20271] libc: Missing "\n" in __libc_fatal calls
2139 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2140 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2141 pointer argument is non-NULL
2142 [21037] stdio: open_memstream and freopen
2143 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2144 [21716] time: Crash in glibc's mktime in low-memory situations
2145 [22834] stdio: Subprocess forked by popen may crash in Linux when
2146 multithreads call popen
2147 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2148 and pthread_create fails.
2149 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2150 [23125] libc: riscv64: endless loop when throwing an exception from a
2152 [23275] nptl: Race in pthread_mutex_lock while promoting to
2153 PTHREAD_MUTEX_ELISION_NP.
2154 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2156 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2158 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2160 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2161 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2163 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2164 [23521] nss: get_next_alias nss_files file stream leak
2165 [23538] nptl: Hang in pthread_cond_broadcast
2166 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2167 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2168 [23579] libc: Errors misreported in preadv2
2169 [23597] build: support/test-container.c doesn't work with different
2171 [23603] time: mktime signed integer overflow on large timestamps
2172 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2173 [23614] libc: powerpc: missing CFI register information in __mpn_*
2175 [23637] string: Generic strstr/strcasestr fails with huge needles
2176 [23640] libc: no way to easily clear FD_CLOEXEC in
2177 posix_spawn_file_actions_adddup2()
2178 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2180 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2182 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2183 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2184 bits/types/struct_rusage.h
2185 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2187 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2189 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2190 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2191 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2193 [23724] localedata: Albanian date formats are incorrect
2194 [23735] math: libnldbl_nonshared.a references internal libm symbols
2195 [23740] localedata: kl_GL: Month names and date formats need update
2196 [23744] regex: regex refactorings to remove BE, avoid duplication
2197 [23745] time: mktime fix for Gnulib + coreutils
2198 [23758] time: Improve the width of alternate representation for year in
2200 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2201 [23789] time: mktime does not set errno on failure
2202 [23791] localedata: Wrong monetary format for ca_ES locale
2203 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2204 [23794] locale: c16rtomb does not handle surrogate pairs
2205 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2206 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2207 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2208 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2209 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2210 [23862] libc: [sh] missing kernel-features.h undefines
2211 [23864] libc: [riscv] missing kernel-features.h undefines
2212 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2213 [23907] malloc: Incorrect double-free malloc tcache check disregards
2215 [23913] libc: off-by-one in function maybe_script_execute in
2216 sysdeps/posix/spawni.c
2217 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2218 [23923] locale: Add --no-hard-links option to localedef
2219 [23927] network: Linux if_nametoindex() does not close descriptor
2221 [23961] math: powf can overflow to inf without setting errno in non-
2222 nearest rounding mode
2223 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2224 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2225 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2226 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2227 [24011] localedata: Fixed small type in comment for locale bs_BA
2228 [24018] libc: gettext() may return NULL
2229 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2230 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2231 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2233 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2234 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2236 [24046] localedata: en_US locale doesn't define date_fmt
2237 [24063] manual: @var{errno} should be @code{errno}
2238 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2239 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2241 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2243 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2245 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2247 [24112] network: Do not send DNS queries for non-host names (where all
2248 answers will be rejected)
2249 [24130] libc: alpha __remqu corrupts $f3 register
2256 * The localization data for ISO 14651 is updated to match the 2016
2257 Edition 4 release of the standard, this matches data provided by
2258 Unicode 9.0.0. This update introduces significant improvements to the
2259 collation of Unicode characters. This release deviates slightly from
2260 the standard in that the collation element ordering for lowercase and
2261 uppercase LATIN script characters is adjusted to ensure that regular
2262 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2263 is not matched by [a-z]. With the update many locales have been
2264 updated to take advantage of the new collation information. The new
2265 collation information has increased the size of the compiled locale
2266 archive or binary locales.
2268 * The GNU C Library can now be compiled with support for Intel CET, AKA
2269 Intel Control-flow Enforcement Technology. When the library is built
2270 with --enable-cet, the resulting glibc is protected with indirect
2271 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2272 compatible with all existing executables and shared libraries. This
2273 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2274 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2275 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2276 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2277 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2278 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2281 * The GNU C Library now has correct support for ABSOLUTE symbols
2282 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2283 relocated incorrectly or in some cases discarded. The GNU linker can
2284 make use of the newer semantics, but it must communicate it to the
2285 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2286 field) to indicate such support is required.
2288 * Unicode 11.0.0 Support: Character encoding, character type info, and
2289 transliteration tables are all updated to Unicode 11.0.0, using
2290 generator scripts contributed by Mike FABIAN (Red Hat).
2292 * <math.h> functions that round their results to a narrower type are added
2293 from TS 18661-1:2014 and TS 18661-3:2015:
2295 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2296 fMxaddfNx functions.
2298 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2299 fMxsubfNx functions.
2301 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2302 fMxmulfNx functions.
2304 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2305 fMxdivfNx functions.
2307 * Two grammatical forms of month names are now supported for the following
2308 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2309 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2310 support two grammatical forms in abbreviated month names: Catalan, Greek,
2313 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2314 include the support for two grammatical forms of month names.
2316 * Building and running on GNU/Hurd systems now works without out-of-tree
2319 * The renameat2 function has been added, a variant of the renameat function
2320 which has a flags argument. If the flags are zero, the renameat2 function
2321 acts like renameat. If the flag is not zero and there is no kernel
2322 support for renameat2, the function will fail with an errno value of
2323 EINVAL. This is different from the existing gnulib function renameatu,
2324 which performs a plain rename operation in case of a RENAME_NOREPLACE
2325 flags and a non-existing destination (and therefore has a race condition
2326 that can clobber the destination inadvertently).
2328 * The statx function has been added, a variant of the fstatat64
2329 function with an additional flags argument. If there is no direct
2330 kernel support for statx, glibc provides basic stat support based on
2331 the fstatat64 function.
2333 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2334 library if installed. libidn2 version 2.0.5 or later is recommended. If
2335 libidn2 is not available, internationalized domain names are not encoded
2336 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2337 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2338 with an encoding error.) Flags which used to change the IDN encoding and
2339 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2340 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2341 deprecated. They no longer have any effect.
2343 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2344 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2345 range of ELF gABI expressions including such constructs as
2346 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2347 have been further restricted, and where in the past a dynamic string
2348 token sequence may have been interpreted as a literal string it will
2349 now cause a load failure. These load failures were always considered
2350 unspecified behaviour from the perspective of the dynamic loader, and
2351 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2352 results in a load failure now.
2354 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2355 implementation includes all the standard functions provided by
2358 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2359 thrd_detach, thrd_exit, and thrd_join for thread management.
2361 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2362 mtx_destroy for mutual exclusion.
2364 - call_once for function call synchronization.
2366 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2367 cnd_wait for conditional variables.
2369 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2371 Application developers must link against libpthread to use ISO C threads.
2373 Deprecated and removed features, and other changes affecting compatibility:
2375 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2376 installed. Software that was using either header should be updated to
2377 use standard <stdio.h> interfaces instead.
2379 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2380 This was never required by the C standard, and the macros just expanded
2381 to call alternative names for the same functions. If you hoped getc and
2382 putc would provide performance improvements over fgetc and fputc, instead
2383 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2384 necessary, flockfile and funlockfile.
2386 * All stdio functions now treat end-of-file as a sticky condition. If you
2387 read from a file until EOF, and then the file is enlarged by another
2388 process, you must call clearerr or another function with the same effect
2389 (e.g. fseek, rewind) before you can read the additional data. This
2390 corrects a longstanding C99 conformance bug. It is most likely to affect
2391 programs that use stdio to read interactive input from a terminal.
2394 * The macros 'major', 'minor', and 'makedev' are now only available from
2395 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2396 headers that happen to include <sys/types.h>. These macros are rarely
2397 used, not part of POSIX nor XSI, and their names frequently collide with
2398 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2399 further explanation.
2401 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2402 these macros should first include <sys/types.h>, and then include
2403 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2405 * The tilegx*-*-linux-gnu configurations are no longer supported.
2407 * The obsolete function ustat is no longer available to newly linked
2408 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2409 function has been deprecated in favor of fstatfs and statfs.
2411 * The obsolete function nfsservctl is no longer available to newly linked
2412 binaries. This function was specific to systems using the Linux kernel
2413 and could not usefully be used with the GNU C Library on systems with
2414 version 3.1 or later of the Linux kernel.
2416 * The obsolete function name llseek is no longer available to newly linked
2417 binaries. This function was specific to systems using the Linux kernel
2418 and was not declared in a header. Programs should use the lseek64 name
2419 for this function instead.
2421 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2422 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2423 previously selected by them is now always enabled.
2425 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2426 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2427 restriction (rejecting '_' in host names, among other things) has been
2428 removed, for increased compatibility with non-IDN name resolution.
2430 * The fcntl function now have a Long File Support variant named fcntl64. It
2431 is added to fix some Linux Open File Description (OFD) locks usage on non
2432 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2433 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2434 locks act as a cancellation entrypoint.
2436 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2437 ecb_crypt, and des_setparity are no longer available to newly linked
2438 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2439 longer installed. These functions encrypted and decrypted data with the
2440 DES block cipher, which is no longer considered secure. Software that
2441 still uses these functions should switch to a modern cryptography library,
2444 * Reflecting the removal of the encrypt and setkey functions above, the
2445 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2446 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2449 * The obsolete function fcrypt is no longer available to newly linked
2450 binaries. It was just another name for the standard function crypt,
2451 and it has not appeared in any header file in many years.
2453 * We have tentative plans to hand off maintenance of the passphrase-hashing
2454 library, libcrypt, to a separate development project that will, we hope,
2455 keep up better with new passphrase-hashing algorithms. We will continue
2456 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2457 'crypt_r' should not need to change at all; however, distributions will
2458 need to install <crypt.h> and libcrypt from a separate project.
2460 In this release, if the configure option --disable-crypt is used, glibc
2461 will not install <crypt.h> or libcrypt, making room for the separate
2462 project's versions of these files. The plan is to make this the default
2463 behavior in a future release.
2465 Changes to build and runtime requirements:
2467 GNU make 4.0 or later is now required to build glibc.
2469 Security related changes:
2471 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2472 been fixed by removing the glibc-internal IDNA implementation and using
2473 the system-provided libidn2 library instead. Originally reported by Hanno
2474 Böck and Christian Weisgerber.
2476 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2477 architecture could corrupt memory. Reported by Max Horn.
2479 CVE-2018-11236: Very long pathname arguments to realpath function could
2480 result in an integer overflow and buffer overflow. Reported by Alexey
2483 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2484 architecture could write beyond the target buffer, resulting in a buffer
2485 overflow. Reported by Andreas Schwab.
2487 The following bugs are resolved with this release:
2489 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2490 [6889] manual: 'PWD' mentioned but not specified
2491 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2492 when __WORDSIZE != 64
2493 [13762] regex: re_search etc. should return -2 on memory exhaustion
2494 [13888] build: /tmp usage during testing
2495 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2496 [14092] nptl: Support C11 threads
2497 [14095] localedata: Review / update collation data from Unicode / ISO
2499 [14508] libc: -Wformat warnings
2500 [14553] libc: Namespace pollution loff_t in sys/types.h
2501 [14890] libc: Make NT_PRFPREG canonical.
2502 [15105] libc: Extra PLT references with -Os
2503 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2505 [16335] manual: Feature test macro documentation incomplete and out of
2507 [16552] libc: Unify umount implementations in terms of umount2
2508 [17082] libc: htons et al.: statement-expressions prevent use on global
2509 scope with -O1 and higher
2510 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2511 [17438] localedata: pt_BR: wrong d_fmt delimiter
2512 [17662] libc: please implement binding for the new renameat2 syscall
2513 [17721] libc: __restrict defined as /* Ignore */ even in c11
2514 [17979] libc: inconsistency between uchar.h and stdint.h
2515 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2516 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2517 horrible machine code)
2518 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2520 [18471] libc: llseek should be a compat symbol
2521 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2523 [18991] nss: nss_files skips large entry in database
2524 [19239] libc: Including stdlib.h ends up with macros major and minor being
2526 [19463] libc: linknamespace failures when compiled with -Os
2527 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2528 [19527] locale: Normalized charset name not recognized by setlocale
2529 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2530 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2532 [19728] network: out of bounds stack read in libidn function
2533 idna_to_ascii_4i (CVE-2016-6261)
2534 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2535 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2536 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2538 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2539 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2540 [20419] dynamic-link: files with large allocated notes crash in
2542 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2543 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2544 [20980] manual: CFLAGS environment variable replaces vital options
2545 [21163] regex: Assertion failure in pop_fail_stack when executing a
2546 malformed regexp (CVE-2015-8985)
2547 [21234] manual: use of CFLAGS makes glibc detect no optimization
2548 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2549 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2550 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2551 [21508] locale: intl/tst-gettext failure with latest msgfmt
2552 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2553 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2554 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2556 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2558 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2559 [22247] network: Integer overflow in the decode_digit function in
2560 puny_decode.c in libidn (CVE-2017-14062)
2561 [22342] nscd: NSCD not properly caching netgroup
2562 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2563 [22550] localedata: es_ES locale (and other es_* locales): collation
2564 should treat ñ as a primary different character, sync the collation
2565 for Spanish with CLDR
2566 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2567 by gcc configured with --enable-default-pie
2568 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2569 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2570 crossing 2GB threshold (CVE-2017-18269)
2571 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2573 [22735] time: Misleading typo in time.h source comment regarding
2575 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2576 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2577 `__assert_perror_fail ()' to `__assert_fail_base ()'
2578 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2580 [22786] libc: Stack buffer overflow in realpath() if input size is close
2581 to SSIZE_MAX (CVE-2018-11236)
2582 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2583 through an absolute DT_NEEDED path
2584 [22792] build: tcb-offsets.h dependency dropped
2585 [22797] libc: pkey_get() uses non-reserved name of argument
2586 [22807] libc: PTRACE_* constants missing for powerpc
2587 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2588 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2589 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2590 [22848] localedata: ca_ES: update date definitions from CLDR
2591 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2592 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2593 [22896] localedata: Update locale data for an_ES
2594 [22902] math: float128 test failures with GCC 8
2595 [22918] libc: multiple common of `__nss_shadow_database'
2596 [22919] libc: sparc32: backtrace yields infinite backtrace with
2598 [22926] libc: FTBFS on powerpcspe
2599 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2601 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2602 [22947] libc: FAIL: misc/tst-preadvwritev2
2603 [22963] localedata: cs_CZ: Add alternative month names
2604 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2605 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2606 [22998] dynamic-link: execstack tests are disabled when SELinux is
2608 [23005] network: Crash in __res_context_send after memory allocation
2610 [23007] math: strtod cannot handle -nan
2611 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2612 [23036] regex: regex equivalence class regression
2613 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2614 [23069] libc: sigaction broken on riscv64-linux-gnu
2615 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2616 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2617 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2618 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2619 and libc build with -Os)
2620 [23140] localedata: More languages need two forms of month names
2621 [23145] libc: _init/_fini aren't marked as hidden
2622 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2623 [23171] math: C++ iseqsig for long double converts arguments to double
2624 [23178] nscd: sudo will fail when it is run in concurrent with commands
2625 that changes /etc/passwd
2626 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2628 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2629 [23208] localedata: New locale - Lower Sorbian (dsb)
2630 [23233] regex: Memory leak in build_charclass_op function in file
2632 [23236] stdio: Harden function pointers in _IO_str_fields
2633 [23250] nptl: Offset of __private_ss differs from GCC
2634 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2635 -mtune=generic -mfpmath=sse
2636 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2638 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2639 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2641 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2642 [23277] math: nan function should not have const attribute
2643 [23279] math: scanf and strtod wrong for some hex floating-point
2644 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2646 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2647 [23303] build: undefined reference to symbol
2648 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2649 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2651 [23313] stdio: libio vtables validation and standard file object
2653 [23329] libc: The __libc_freeres infrastructure is not properly run across
2655 [23349] libc: Various glibc headers no longer compatible with
2657 [23351] malloc: Remove unused code related to heap dumps and malloc
2659 [23363] stdio: stdio-common/tst-printf.c has non-free license
2660 [23396] regex: Regex equivalence regression in single-byte locales
2661 [23422] localedata: oc_FR: More updates of locale data
2662 [23442] build: New warning with GCC 8
2663 [23448] libc: Out of bounds access in IBM-1390 converter
2664 [23456] libc: Wrong index_cpu_LZCNT
2665 [23458] build: tst-get-cpu-features-static isn't added to tests
2666 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2668 [23467] dynamic-link: x86/CET: A property note parser bug
2675 * The GNU C Library can now be compiled with support for building static
2676 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2677 executables are like static executables but can be loaded at any address
2678 and provide additional security hardening benefits at the cost of some
2679 memory and performance. When the library is built with --enable-static-pie
2680 the resulting libc.a is usable with GCC 8 and above to create static PIE
2681 executables using the GCC option '-static-pie'. This feature is currently
2682 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2683 aarch64 with binutils 2.30 or later.
2685 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2686 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2689 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2691 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2693 * In order to support faster and safer process termination the malloc API
2694 family of functions will no longer print a failure address and stack
2695 backtrace after detecting heap corruption. The goal is to minimize the
2696 amount of work done after corruption is detected and to avoid potential
2697 security issues in continued process execution. Reducing shutdown time
2698 leads to lower overall process restart latency, so there is benefit both
2699 from a security and performance perspective.
2701 * The abort function terminates the process immediately, without flushing
2702 stdio streams. Previous glibc versions used to flush streams, resulting
2703 in deadlocks and further data corruption. This change also affects
2704 process aborts as the result of assertion failures.
2706 * On platforms where long double has the IEEE binary128 format (aarch64,
2707 alpha, mips64, riscv, s390 and sparc), the math library now implements
2708 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2709 These are the same interfaces added in version 2.26 for some platforms where
2710 this format is supported but is not the format of long double.
2712 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2713 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2714 implements interfaces for that type, as defined by ISO/IEC TS
2715 18661-3:2015. These are corresponding interfaces to those supported for
2718 * The math library now implements interfaces for the _Float32, _Float64 and
2719 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2720 corresponding interfaces to those supported for _Float128.
2722 * glibc now implements the memfd_create and mlock2 functions on Linux.
2724 * Support for memory protection keys was added. The <sys/mman.h> header now
2725 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2728 * The copy_file_range function was added.
2730 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2732 * The ldconfig utility now processes `include' directives using the C/POSIX
2733 collation ordering. Previous glibc versions used locale-specific
2734 ordering, the change might break systems that relied on that.
2736 * Support for two grammatical forms of month names has been added.
2737 In a call to strftime, the "%B" and "%b" format specifiers will now
2738 produce the grammatical form required when the month is used as part
2739 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2740 required when the month is named by itself. For instance, in Greek
2741 and in many Slavic and Baltic languages, "%B" will produce the month
2742 in genitive case, and "%OB" will produce the month in nominative case.
2744 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2745 are all valid and will all accept any known form of month
2746 name---standalone or complete, abbreviated or full. In a call to
2747 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2748 the strings used by "%B" and "%b", respectively. New query
2749 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2750 used by "%OB" and "%Ob", respectively.
2752 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2753 define the strings for %OB and %Ob, respectively; these have the
2754 same syntax as "mon" and "abmon". These arrays are optional; if they
2755 are not provided then they have the same content as "mon" and "abmon",
2758 These features are provided for locales which define "alt_mon" and/or
2759 "ab_alt_mon" in their locale source data. This release includes such
2760 alternative month name data for the following languages: Belarusian,
2761 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2763 This feature is currently a GNU extension, but it is expected to
2764 be added to the next revision of POSIX, and it is also already
2765 available on some BSD-derived operating systems.
2767 This feature will cause existing statically compiled applications
2768 to fail to load locales and fall back to the builtin C/POSIX locales.
2769 See notes below for other changes affecting compatibility.
2771 * Support for the RISC-V ISA running on Linux has been added. This port
2772 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2773 for the following ISA and ABI pairs:
2779 Deprecated and removed features, and other changes affecting compatibility:
2781 * Statically compiled applications attempting to load locales compiled for the
2782 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2783 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2784 support for two grammatical forms of the month names, also extends the locale
2785 data binary format. Static applications needing locale support must be
2786 recompiled to match the runtime and data they are deployed with. In some
2787 distributions there is an upgrade window where dynamically linked applications
2788 may use a new library but the old locale data and also fall back to the
2789 builtin C/POSIX locales; restarting the application process is sufficient to
2792 * Support for statically linked applications which call dlopen is deprecated
2793 and will be removed in a future version of glibc. Applications which call
2794 dlopen need to be linked dynamically instead.
2796 * Support for old programs which use internal stdio data structures and
2797 functions is deprecated. This includes programs which use the C++ streams
2798 provided by libstdc++ in GCC 2.95. Programs which use the internal
2799 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2800 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2801 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2802 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2803 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2804 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2805 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2806 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2807 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2808 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2809 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2810 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2811 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2812 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2813 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2814 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2815 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2816 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2817 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2818 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2819 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2820 future version of glibc. Unlike other symbol removals, these old
2821 applications will not be supported using compatibility symbols.
2823 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2824 defined by <sys/ptrace.h>.
2826 * libm no longer supports SVID error handling (calling a user-provided
2827 matherr function on error) or the _LIB_VERSION variable to control error
2828 handling. (SVID error handling and the _LIB_VERSION variable still work
2829 for binaries linked against older versions of the GNU C Library.) The
2830 libieee.a library is no longer provided. math.h no longer defines struct
2831 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2832 TLOSS, PLOSS and HUGE.
2834 * The libm functions pow10, pow10f and pow10l are no longer supported for
2835 new programs. Programs should use the standard names exp10, exp10f and
2836 exp10l for these functions instead.
2838 * The mcontext_t type is no longer the same as struct sigcontext. On
2839 platforms where it was previously the same, this changes the C++ name
2840 mangling for interfaces involving this type.
2842 * The add-ons mechanism for building additional packages at the same time as
2843 glibc has been removed. The --enable-add-ons configure option is now
2846 * The --without-fp configure option is now ignored. Whether hardware
2847 floating-point instructions are used is now configured based on whether
2848 the compiler used at configure time (without any options implied by a
2849 --with-cpu= configure option) uses such instructions.
2851 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2852 the specified string can be parsed as a domain name.
2854 * In the malloc_info output, the <heap> element may contain another <aspace>
2855 element, "subheaps", which contains the number of sub-heaps.
2857 * The libresolv function p_secstodate is no longer supported for new
2860 * The tilepro-*-linux-gnu configuration is no longer supported.
2862 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2863 and will be removed in a future release. Software that is still using
2864 either header should be updated to use standard <stdio.h> interfaces
2867 libio.h was originally the header for a set of supported GNU extensions,
2868 but they have not been maintained as such in many years, they are now
2869 standing in the way of improvements to stdio, and we don't think there are
2870 any remaining external users. _G_config.h was never intended for public
2871 use, but predates the bits convention.
2873 Changes to build and runtime requirements:
2875 * bison version 2.7 or later is required to generate code in the 'intl'
2878 Security related changes:
2880 CVE-2009-5064: The ldd script would sometimes run the program under
2881 examination directly, without preventing code execution through the
2882 dynamic linker. (The glibc project disputes that this is a security
2883 vulnerability; only trusted binaries must be examined using the ldd
2886 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2887 suffered from a one-byte overflow during ~ operator processing (either
2888 on the stack or the heap, depending on the length of the user name).
2889 Reported by Tim Rühsen.
2891 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2892 would sometimes fail to free memory allocated during ~ operator
2893 processing, leading to a memory leak and, potentially, to a denial
2896 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2897 without GLOB_NOESCAPE, could write past the end of a buffer while
2898 unescaping user names. Reported by Tim Rühsen.
2900 CVE-2017-17426: The malloc function, when called with an object size near
2901 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2902 instead of NULL. This was a regression introduced with the new malloc
2903 thread cache in glibc 2.26. Reported by Iain Buclaw.
2905 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2906 to the allocation of too much memory. (This is not a security bug per se,
2907 it is mentioned here only because of the CVE assignment.) Reported by
2910 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2911 of the number of search path components. (This is not a security
2912 vulnerability per se because no trust boundary is crossed if the fix for
2913 CVE-2017-1000366 has been applied, but it is mentioned here only because
2914 of the CVE assignment.) Reported by Qualys.
2916 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2917 for AT_SECURE or SUID binaries could be used to load libraries from the
2920 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2921 succeeds without returning an absolute path due to unexpected behaviour
2922 of the Linux kernel getcwd syscall. Reported by halfdog.
2924 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2925 an object size near the value of SIZE_MAX, would return a pointer to a
2926 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2928 CVE-2018-6551: The malloc function, when called with an object size near
2929 the value of SIZE_MAX, would return a pointer to a buffer which is too
2930 small, instead of NULL.
2932 The following bugs are resolved with this release:
2934 [866] glob: glob should match dangling symlinks
2935 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2936 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2938 [5997] math: Very slow execution of sinf function
2939 [10580] localedata: hr_HR: updated locale
2940 [10871] locale: 'mon' array should contain both nominative and genitive
2942 [12349] localedata: eu_ES: incorrect thousands separator
2943 [13605] localedata: shn_MM: new Shan locale
2944 [13805] localedata: ru_RU: currency should use ',' as radix point
2945 [13953] localedata: km_KH: locale update
2946 [13994] localedata: mjw_IN: new locale
2947 [14121] build: make writes .mo files in po directory
2948 [14333] libc: Fix the race between atexit() and exit()
2949 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2950 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2952 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2953 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2954 width Latin characters
2955 [15332] localedata: es_CU: locale update
2956 [15436] stdio: Don't close or flush stdio streams on abort
2957 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2959 [16148] localedata: ca_ES: incorrect thousands separator
2960 [16750] dynamic-link: ldd should not try to execute the binaries
2962 [16777] localedata: pl_PL: incorrect thousands separator in locale
2963 [16905] localedata: hanzi: new collation
2964 [17563] localedata: cmn_TW: add hanzi collation
2965 [17750] localedata: wrong collation order of diacritics in most locales
2966 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2968 [17956] build: Build fails on missing definitions from header file
2969 nss/nss.h when Mozilla NSS is used for cryptography
2970 [18203] libc: realpath() does not handle unreachable paths correctly
2971 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2972 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2973 [18822] libc: Internal functions are called via PLT
2974 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2975 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2976 [19574] libc: glibc should support building static PIE binaries
2977 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2979 [19971] glob: glob: Do not skip entries with zero d_ino values
2980 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2981 [20008] localedata: km_KH: convert to translit_neutral
2982 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2983 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2984 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2985 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2986 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2988 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2989 they're set, wrong errors returned by gaih_inet when lookup functions
2991 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2992 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2994 [20952] localedata: yuw_PG: new locale
2995 [21084] localedata: charmaps/IBM858: new codepage
2996 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2997 [21242] libc: assert gives pedantic warning in old gcc versions
2998 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2999 __regcall calling convention
3000 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
3001 [21326] libc: C99 functions are not declared for C++11 and later if
3002 _GNU_SOURCE is not predefined by g++
3003 [21457] libc: sys/ucontext.h namespace
3004 [21530] libc: tmpfile() should be implemented using O_TMPFILE
3005 [21660] math: GCC fails to compile a formula with tgmath.h
3006 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
3007 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
3008 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3009 [21684] math: tgmath.h handling of complex integers
3010 [21685] math: tgmath.h handling of bit-fields
3011 [21686] math: tgmath.h handling of __int128
3012 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3014 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3016 [21750] localedata: column width of characters incompatible with classical
3018 [21754] malloc: malloc: Perform as little work as possible after heap
3019 consistency check failures
3020 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3021 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3022 [21791] string: Unused XXX_chk_XXX functions in libc.a
3023 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3025 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3027 [21845] localedata: Added new Locale bho_NP
3028 [21853] localedata: Fix abday Which looks same as day in zh_SG
3029 [21854] localedata: Added New Locale en_SC
3030 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3031 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3032 _dl_runtime_resolve_avx_slow
3033 [21885] network: getaddrinfo: gethosts does not release resolver context
3034 on memory allocation failure
3035 [21899] libc: XPG4.2 sigaction namespace
3036 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3038 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3040 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3041 errno value, causing getaddrinfo to fail
3042 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3043 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3044 instead of EAI_NODATA
3045 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3046 constant PTRACE_SEIZE_DEVEL
3047 [21930] math: C-only gcc builtins used in <math.h> isinf
3048 [21932] network: Unpaired __resolv_context_get in generic get*_r
3050 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3051 [21944] libc: sigval namespace
3052 [21951] localedata: Update hanzi collation by stroke
3053 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3054 sysdeps/x86_64/fpu/e_expf.S
3055 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3056 allocation in syscall loops)
3057 [21959] localedata: Fix Country name for xh_ZA
3058 [21960] localedata: Fix abmon for bem_ZM
3059 [21966] math: AVX2 mathvec functions use FMA without checking
3060 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3061 [21971] localedata: Added New Locale for mfe_MU
3062 [21972] libc: assert macro requires operator== (int) for its argument type
3063 [21973] math: [sparc] libm missing sqrtl compat symbol
3064 [21974] libc: Remove __bb_init_func and __bb_exit_func
3065 [21982] string: stratcliff.c: error: assuming signed overflow does not
3067 [21986] stdio: __guess_grouping is called incorrectly
3068 [21987] math: [sparc32] wrong bits/long-double.h installed
3069 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3071 [22022] localedata: Missing country_name for mni_IN
3072 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3074 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3076 [22026] locale: iconv_open: heap overflow on gconv_init failure
3077 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3078 [22035] math: [m68k] bits/math-inline.h macro namespace
3079 [22038] localedata: Fix abbreviated weeks and months for Somali
3080 [22044] localedata: Remove redundant data for Limburgish Language
3081 [22050] malloc: Linking with -lmcheck does not hook
3082 __malloc_initialize_hook correctly
3083 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3084 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3085 [22070] localedata: charmaps/UTF-8: wcwidth for
3086 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3087 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3088 Jungseong and Jongseong) should be 0
3089 [22078] nss: nss_files performance issue in multi mode
3090 [22082] math: bits/math-finite.h exp10 condition
3091 [22086] libc: pcprofiledump incorrect cross-endian condition
3092 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3093 [22095] network: Name server address allocation memory leak in resolv.conf
3095 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3097 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3098 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3100 [22111] malloc: malloc: per thread cache is not returned when thread exits
3101 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3102 [22134] libc: [linux] implement fexecve with execveat
3103 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3105 [22145] libc: ttyname() gives up too early in the face of namespaces
3106 [22146] math: C++ build issue with float128 on x86_64
3107 [22153] nptl: nptl: save error code before process termination
3108 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3109 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3110 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3111 [22165] libc: [hppa] Text relocations in libc.so
3112 [22180] libc: destructor registered via __cxa_atexit is called twice
3113 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3114 symlinks") cause "make" segfaults
3115 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3117 [22207] libc: FAIL: stdlib/test-atexit-race
3118 [22225] math: nearbyint arithmetic moved before feholdexcept
3119 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3120 [22235] math: iscanonical in C++ and float128
3121 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3122 the svid compat wrapper
3123 [22244] math: ynf and yn are wrong without the svid compat wrapper
3124 [22273] libc: Improper assert in Linux posix_spawn implementation
3125 [22284] libc: -pg -pie doesn't work
3126 [22292] locale: localedef exits with error 4 when it should be error 1
3127 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3128 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3130 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3131 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3133 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3134 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3135 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3136 [22322] libc: [mips64] wrong bits/long-double.h installed
3137 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3138 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3140 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3141 [22343] malloc: Integer overflow in posix_memalign
3142 [22347] libc: getrandom() returns the number of bytes that were copied to
3143 the buffer even though the comments say "Return 0 on success and -1 on
3145 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3146 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3148 [22370] dynamic-link: Incorrect note padding check
3149 [22375] libc: malloc returns pointer from tcache_get when should return
3150 NULL (CVE-2017-17426)
3151 [22377] math: iseqsig, float128 and C++
3152 [22382] localedata: Error in tpi_PG locale
3153 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3154 inside the ASCII printable range
3155 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3157 [22403] localedata: Slash needs escaping in some locales
3158 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3159 [22409] network: res_hnok does not accept some host names used on the
3161 [22412] network: res_dnok, res_hnok should perform syntax checks
3162 [22413] network: ns_name_pton ignores syntactically invalid trailing
3164 [22415] stdio: setvbuf can lead to invalid free/segfault
3165 [22432] build: Non-deterministic build
3166 [22439] malloc: malloc_info should compute summary statistics for all sub-
3168 [22442] network: if_nametoindex could report index for the wrong
3169 networking interface
3170 [22446] build: aliasing violation calling readlink in handle_request
3171 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3172 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3173 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3174 __nscd_hash/__nss_hash
3175 [22463] network: p_secstodate overflow handling
3176 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3177 [22478] libc: sigwait can fail with EINTR
3178 [22505] libc: ldconfig processes include directive in locale-specific
3180 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3181 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3182 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3183 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3184 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3185 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3186 same as for Croatian
3187 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3188 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3189 [22577] libc: missing newline after "cannot allocate TLS data structures
3191 [22588] manual: manual/conf.texi: missing underscore in front of
3193 [22593] math: nextafter and nexttoward are declared with const attribute
3194 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3195 [22603] string: ia64 memchr overflows internal pointer check
3196 [22605] libc: SH clone does not set the exit code correctly
3197 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3199 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3200 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3201 modified in case of success
3202 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3203 [22615] manual: manual: ambiguous wording about errno value in case of
3205 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3207 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3208 binaries or if /proc is not mounted (CVE-2017-16997)
3209 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3210 [22630] build: $(no-pie-ldflag) is no longer effective
3211 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3212 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3213 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3214 [22637] nptl: guard size is subtracted from thread stack size instead of
3216 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3217 [22657] localedata: hu_HU: Avoid double space in date
3218 [22660] math: fmax, fmin sNaN handling on alpha
3219 [22664] libc: New warning of GCC8
3220 [22665] math: alpha: ceil and floor raise inexact exceptions
3221 [22666] math: alpha: trunc raise inexact exceptions
3222 [22667] libc: makecontext lacks stack alignment on i386
3223 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3224 [22679] libc: getcwd(3) can succeed without returning an absolute path
3226 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3227 elision and tunables
3228 [22687] math: [powerpc-nofpu] complex long double functions spurious
3230 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3231 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3232 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3234 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3235 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3237 [22701] nis: Incomplete removal of libnsl
3238 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3239 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3240 [22715] dynamic-link: FAIL: elf/tst-audit10
3241 [22719] libc: Backtrace tests fail on hppa
3242 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3243 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3244 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3245 before the first call to crypt_r () in crypt/badsalttest.c
3252 * A per-thread cache has been added to malloc. Access to the cache requires
3253 no locks and therefore significantly accelerates the fast path to allocate
3254 and free small amounts of memory. Refilling an empty cache requires locking
3255 the underlying arena. Performance measurements show significant gains in a
3256 wide variety of user workloads. Workloads were captured using a special
3257 instrumented malloc and analyzed with a malloc simulator. Contributed by
3258 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3260 * Unicode 10.0.0 Support: Character encoding, character type info, and
3261 transliteration tables are all updated to Unicode 10.0.0, using
3262 generator scripts contributed by Mike FABIAN (Red Hat).
3263 These updates cause user visible changes, especially the changes in
3264 wcwidth for many emoji characters cause problems when emoji sequences
3265 are rendered with pango, see for example:
3266 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3268 * Collation of Hungarian has been overhauled and is now consistent with "The
3269 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3272 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3274 - The GNU C Library will now detect when /etc/resolv.conf has been
3275 modified and reload the changed configuration. The new resolver option
3276 “no-reload” (RES_NORELOAD) disables this behavior.
3278 - The GNU C Library now supports an arbitrary number of search domains
3279 (configured using the “search” directive in /etc/resolv.conf);
3280 previously, there was a hard limit of six domains. For backward
3281 compatibility, applications that directly modify the ‘_res’ global
3282 object are still limited to six search domains.
3284 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3285 Library will now randomly pick a name server from the configuration as a
3286 starting point. (Previously, the second name server was always used.)
3288 * The tunables feature is now enabled by default. This allows users to tweak
3289 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3291 * New function reallocarray, which resizes an allocated block (like realloc)
3292 to the product of two sizes, with a guaranteed clean failure upon integer
3293 overflow in the multiplication. Originally from OpenBSD, contributed by
3294 Dennis Wölfing and Rüdiger Sonderfeld.
3296 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3297 These are extended versions of preadv and pwritev, respectively, taking an
3298 additional flags argument. The set of supported flags depends on the
3299 running kernel; full support currently requires kernel 4.7 or later.
3301 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3302 create a new session ID for the spawned process. This feature is
3303 scheduled to be added to the next major revision of POSIX; for the time
3304 being, it is available under _GNU_SOURCE.
3306 * errno.h is now safe to use from C-preprocessed assembly language on all
3307 supported operating systems. In this context, it will only define the
3308 Exxxx constants, as preprocessor macros expanding to integer literals.
3310 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3311 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3312 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3313 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3315 To compile programs that use this feature, the compiler must support
3316 128-bit floating point with the type name _Float128 (as defined by TS
3317 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3318 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3319 must be defined to make the new interfaces visible.
3321 The new functions and macros correspond to those present for other
3322 floating-point types (except for a few obsolescent interfaces not
3323 supported for the new type), with F128 or f128 suffixes; for example,
3324 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3325 printf or scanf formats for the new type; the strfromf128 and strtof128
3326 interfaces should be used instead.
3328 Deprecated and removed features, and other changes affecting compatibility:
3330 * The synchronization that pthread_spin_unlock performs has been changed to
3331 now be equivalent to a C11 atomic store with release memory order to the
3332 spin lock's memory location. Previously, several (but not all)
3333 architectures used stronger synchronization (e.g., containing what is
3334 often called a full barrier). This change can improve performance, but
3335 may affect odd fringe uses of spin locks that depend on the previous
3336 behavior (e.g., using spin locks as atomic variables to try to implement
3337 Dekker's mutual exclusion algorithm).
3339 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3342 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3343 will only be built and installed when the GNU C Library is configured with
3344 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3345 as TIRPC or rpcsvc-proto, to be used.
3347 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3348 libnss_compat, are deprecated, and will not be built or installed by
3351 The NIS(+) support library, libnsl, is also deprecated. By default, a
3352 compatibility shared library will be built and installed, but not headers
3353 or development libraries. Only a few NIS-related programs require this
3354 library. (In particular, the GNU C Library has never required programs
3355 that use 'gethostbyname' to be linked with libnsl.)
3357 Replacement implementations based on TIRPC, which additionally support
3358 IPv6, are available from <https://github.com/thkukuk/>. The configure
3359 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3360 name service modules, to be built and installed.
3362 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3363 support is enabled, the configured recursive resolver must support EDNS.
3364 (Responding to EDNS-enabled queries with responses which are not
3365 EDNS-enabled is fine, but FORMERR responses are not.)
3367 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3368 servers have not supported this opcode for a long time.
3370 * The _res_opcodes variable has been removed from libresolv. It had been
3371 exported by accident.
3373 * <string.h> no longer includes inline versions of any string functions,
3374 as this kind of optimization is better done by the compiler. The macros
3375 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3377 * The nonstandard header <xlocale.h> has been removed. Most programs should
3378 use <locale.h> instead. If you have a specific need for the definition of
3379 locale_t with no other declarations, please contact
3380 libc-alpha@sourceware.org and explain.
3382 * The obsolete header <sys/ultrasound.h> has been removed.
3384 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3386 * The obsolete function cfree has been removed. Applications should use
3389 * The stack_t type no longer has the name struct sigaltstack. This changes
3390 the C++ name mangling for interfaces involving this type.
3392 * The ucontext_t type no longer has the name struct ucontext. This changes
3393 the C++ name mangling for interfaces involving this type.
3395 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3396 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3397 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3398 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3399 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3400 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3401 fpregset_t type no longer has the name struct fpu. This changes the C++
3402 name mangling for interfaces involving those types.
3404 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3405 synced with the kernel:
3407 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3408 are not supported on this architecture and have been removed.
3410 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3411 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3412 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3414 Programs that assume the GET/SETREGS ptrace requests are universally
3415 available will now fail to build, instead of malfunctioning at runtime.
3417 Changes to build and runtime requirements:
3419 * Linux kernel 3.2 or later is required at runtime, on all architectures
3420 supported by that kernel. (This is a change from version 2.25 only for
3423 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3425 * On most architectures, GCC 4.9 or later is required to build the GNU C
3426 Library. On powerpc64le, GCC 6.2 or later is required.
3428 Older GCC versions and non-GNU compilers are still supported when
3429 compiling programs that use the GNU C Library. (We do not know exactly
3430 how old, and some GNU extensions to C may be _de facto_ required. If you
3431 are interested in helping us make this statement less vague, please
3432 contact libc-alpha@sourceware.org.)
3434 Security related changes:
3436 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3437 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3439 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3440 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3442 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3443 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3446 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3447 fixed (CVE-2017-12133).
3449 The following bugs are resolved with this release:
3451 [984] network: Respond to changed resolv.conf in gethostbyname
3452 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3453 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3455 [12189] libc: __stack_chk_fail should not attempt a backtrace
3457 [14096] time: Race condition on timezone/tst-timezone.out
3458 [14172] localedata: az_IR: new locale
3459 [14995] build: glibc fails to build if gold is the default linker, even if
3461 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3462 [16637] network: inet_pton function is accepting IPv6 with bad format
3463 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3464 x86 and other generic code
3465 [16875] localedata: ko_KR: fix lang_name
3466 [17225] localedata: ar_SY: localized month names for May and June are
3468 [17297] localedata: da_DK: wrong date_fmt string
3469 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3470 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3471 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3472 [19066] localedata: ar_SA abbreviated day and month names are in English
3473 [19569] network: resolv: Support an arbitrary number of search domains
3474 [19570] network: Implement random DNS server selection in the stub
3476 [19838] locale: localedef fails on PA-RISC
3477 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3478 order of 0D36 and 0D37
3479 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3481 [20098] libc: FAIL: debug/backtrace-tst on hppa
3482 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3484 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3486 [20313] localedata: Update locale data to Unicode 9.0
3487 [20424] manual: Document how to provide a malloc replacement
3488 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3490 [20686] locale: Add el_GR@euro to SUPPORTED.
3491 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3492 failures consistently
3493 [21015] dynamic-link: Document and fix --enable-bind-now
3494 [21016] nptl: pthread_cond support is broken on hppa
3495 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3496 frame-pointer on i386
3497 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3499 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3500 [21088] libc: Build fails with --enable-static-nss
3501 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3502 generic c code is used
3503 [21109] libc: Tunables broken on big-endian
3504 [21112] math: powf has large ulp errors with base close to 1 and exponent
3506 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3508 [21120] malloc: glibc malloc is incompatible with GCC 7
3509 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3511 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3512 (-0.0) when linking with -lieee
3513 [21171] math: log10, log2 and lgamma return incorrect results
3514 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3515 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3516 [21207] localedata: ce_RU: update weekdays from CLDR
3517 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3518 [21217] localedata: Update months from CLDR-31
3519 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3520 [21243] libc: support_delete_temp_file should issue warning for failed
3522 [21244] libc: support resolv_test_start() socket fd close should be
3524 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3525 new posix_spawn implementation
3526 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3527 leads to lower CPU frequency
3528 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3529 [21261] libc: [sparc64] bits/setjmp.h namespace
3530 [21267] network: [mips] bits/socket.h IOC* namespace
3531 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3532 [21270] libc: mmap64 silently truncates large offset values
3533 [21275] libc: posix_spawn always crashes on ia64 now
3534 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3535 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3536 [21289] libc: Incorrect declaration for 32-bit platforms with
3537 _FILE_OFFSET_BITS=64 causes build error
3538 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3539 not support gethostbyname4_r
3540 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3542 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3544 [21340] libc: Support POSIX_SPAWN_SETSID
3545 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3546 [21359] network: ns_name_pack needs additional byte in destination buffer
3547 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3548 against fragmentation attacks (CVE-2017-12132)
3549 [21369] network: resolv: Remove EDNS fallback
3550 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3552 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3553 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3554 [21393] stdio: Missing dup3 error check in freopen, freopen64
3555 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3556 [21399] localedata: Bad description for U00EC in
3557 localedata/charmaps/CP1254
3558 [21411] malloc: realloc documentation error
3559 [21426] network: sys/socket.h uio.h namespace
3560 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3561 [21445] libc: signal.h bsd_signal namespace
3562 [21455] network: Network headers stdint.h namespace
3563 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3565 [21475] network: resolv: Overlong search path is truncated mid-label
3566 [21511] libc: sigstack namespace
3567 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3568 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3569 bits/syscall.h: No such file or directory
3570 [21517] libc: struct sigaltstack namespace
3571 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3572 [21533] localedata: Update locale data to Unicode 10.0
3574 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3575 junk at end of line, first unrecognized character is `@'
3576 [21538] libc: SIG_HOLD missing for XPG4
3577 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3578 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3579 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3580 [21543] libc: sigevent namespace
3581 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3582 size for general purpose registers in mcontext_t structure
3583 [21550] libc: sigwait namespace
3584 [21552] libc: XPG4 bsd_signal namespace
3585 [21554] libc: sigpause namespace
3586 [21560] libc: sys/wait.h signal.h namespace
3587 [21561] libc: waitid namespace
3588 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3589 '/usr/include/stdlib.h': Permission denied
3590 [21575] libc: sys/wait.h missing struct rusage definition
3591 [21584] libc: sigaltstack etc namespace
3592 [21597] libc: siginterrupt namespace
3593 [21607] math: hppa: FAIL: math/test-tgmath
3594 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3596 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3597 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3598 stack and heap (CVE-2017-1000366)
3599 [21625] libc: wait3 namespace
3600 [21654] nss: Incorrect pointer alignment in NSS group merge result
3602 [21657] network: Parse interface zone id for node-local multicast
3603 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3605 [21666] libc: .symver is used on common symbol
3606 [21668] network: resolv: res_init cross-thread broadcast introduces race
3608 [21687] math: tgmath.h totalorder, totalordermag return type
3609 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3611 [21696] libc: Incorrect assumption of of __cpu_mask in
3612 posix/sched_cpucount.c
3613 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3614 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3616 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3617 leading to relocation crash
3618 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3619 `resolv_conf_matches (resp, conf)' failed.
3620 [21710] localedata: Added Samoan language locale for Samoa
3621 [21711] localedata: Pashto yesstr/nostr locale are missing
3622 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3623 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3624 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3625 [21723] localedata: yesstr/nostr missing for Chinese language locale
3626 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3628 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3630 [21728] localedata: New Locale for Tongan language
3631 [21729] localedata: incorrect LC_NAME fields for hi_IN
3632 [21733] localedata: yesstr and nostr are missing for zh_HK
3633 [21734] localedata: Missing yesstr and nostr are for kw_GB
3634 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3635 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3636 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3637 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3639 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3641 [21749] localedata: Wrong abbreviated day name (“abday”) for
3643 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3644 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3645 [21759] localedata: missing yesstr and nostr for Tigrinya
3646 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3647 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3648 [21767] localedata: Missing Bislama locales
3649 [21768] localedata: Missing yesstr and nostr for aa_ET
3650 [21770] localedata: Missing Field in li_NL
3651 [21778] nptl: Robust mutex may deadlock
3652 [21779] libc: MicroBlaze segfaults when loading libpthread
3653 [21783] localedata: Fix int_select international_call_prefixes
3654 [21784] localedata: Inconsistency in country_isbn
3655 [21788] localedata: Missing Country Postal Abbreviations
3656 [21794] localedata: Added-country_isbn-for-Italy
3657 [21795] localedata: Add/Fix country_isbn for France
3658 [21796] localedata: Added country_isbn for Republic of Korea
3659 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3660 [21799] localedata: Added int_select international_call_prefixes
3661 [21801] localedata: Added int_select international_call_prefixes
3662 [21804] nptl: Double semicolon in thread-shared-types.h
3663 [21807] localedata: LC_ADDRESS fix for pap_CW
3664 [21808] localedata: Fix LC_ADDRESS for pap_AW
3665 [21821] localedata: Added country_name in mai_IN
3666 [21822] localedata: Fix LC_TIME for mai_IN
3667 [21823] localedata: missing yesstr, nostr for sa_IN
3668 [21825] localedata: Fix name_mrs for mag_IN
3669 [21828] localedata: 2.26 changelog should mention user visible changes
3671 [21835] localedata: Added Maithili language locale for Nepal
3672 [21838] localedata: Removed redundant data for the_NP
3673 [21839] localedata: Fix LC_MONETARY for ta_LK
3674 [21844] localedata: Fix Latin characters and Months Sequence.
3675 [21848] localedata: Fix mai_NP Title Name
3680 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3681 24731-2:2010, is supported to enable declarations of functions from that
3682 TR. Note that not all functions from that TR are supported by the GNU C
3685 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3686 18661-1:2014, is supported to enable declarations of functions and macros
3687 from that TS. Note that not all features from that TS are supported by
3690 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3691 18661-4:2015, is supported to enable declarations of functions and macros
3692 from that TS. Note that most features from that TS are not supported by
3695 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3696 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3697 Since the GNU C Library defaults to a much newer revision of POSIX, this
3698 will only affect programs that specifically request an old conformance
3699 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3700 see a change in the visible declarations, but a program compiled with
3701 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3704 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3705 defined by all multithreaded code, but glibc has not required this for
3708 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3709 means that in a future release, the macros “major”, “minor”, and “makedev”
3710 will only be available from <sys/sysmacros.h>.
3712 These macros are not part of POSIX nor XSI, and their names frequently
3713 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3714 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3715 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3718 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3719 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3720 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3722 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3723 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3724 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3725 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3726 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3727 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3728 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3729 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3730 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3731 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3732 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3735 * New <math.h> features are added from TS 18661-1:2014:
3737 - Signaling NaN macros: SNANF, SNAN, SNANL.
3739 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3740 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3741 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3743 - llogb functions: the llogb, llogbf and llogbl functions, and the
3744 FP_LLOGB0 and FP_LLOGBNAN macros.
3746 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3749 - Comparison macros: iseqsig.
3751 - Classification macros: iscanonical, issubnormal, iszero.
3753 - Total order functions: totalorder, totalorderf, totalorderl,
3754 totalordermag, totalordermagf, totalordermagl.
3756 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3758 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3759 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3761 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3762 are added to libc. They convert a floating-point number into string.
3764 * Most of glibc can now be built with the stack smashing protector enabled.
3765 It is recommended to build glibc with --enable-stack-protector=strong.
3766 Implemented by Nick Alcock (Oracle).
3768 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3769 intended to be used instead of memset() to erase sensitive data after use;
3770 the compiler will not optimize out calls to explicit_bzero even if they
3771 are "unnecessary" (in the sense that no _correct_ program can observe the
3772 effects of the memory clear).
3774 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3775 to float instead of double. This does not affect the ABI of any libraries
3776 that are part of the GNU C Library, but may affect the ABI of other
3777 libraries that use this type in their interfaces.
3779 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3780 float_t and double_t types are now defined to long double instead of float
3781 and double. These options are not the default, and this does not affect
3782 the ABI of any libraries that are part of the GNU C Library, but it may
3783 affect the ABI of other libraries that use this type in their interfaces,
3784 if they are compiled or used with those options.
3786 * The getentropy and getrandom functions, and the <sys/random.h> header file
3789 * The buffer size for byte-oriented stdio streams is now limited to 8192
3790 bytes by default. Previously, on Linux, the default buffer size on most
3791 file systems was 4096 bytes (and thus remains unchanged), except on
3792 network file systems, where the buffer size was unpredictable and could be
3793 as large as several megabytes.
3795 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3796 for the Linux quota interface which predates kernel version 2.4.22 has
3799 * The malloc_get_state and malloc_set_state functions have been removed.
3800 Already-existing binaries that dynamically link to these functions will
3801 get a hidden implementation in which malloc_get_state is a stub. As far
3802 as we know, these functions are used only by GNU Emacs and this change
3803 will not adversely affect already-built Emacs executables. Any undumped
3804 Emacs executables, which normally exist only during an Emacs build, should
3805 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3807 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3808 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3809 “no-ip6-dotint” had already been the default, and support for the
3810 “ip6-dotint” option was removed from the Internet in 2006.
3812 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3813 flag from <resolv.h> have been removed. The option relied on a
3814 backwards-incompatible DNS extension which was never deployed on the
3817 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3818 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3819 They were already unimplemented.
3821 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3822 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3823 removed again from the IETF name lookup interface specification in RFC
3824 2553. Applications should use getaddrinfo instead.
3826 * DNSSEC-related declarations and definitions have been removed from the
3827 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3828 decode the data part of DNSSEC record types. Previous versions of glibc
3829 only implemented minimal support for the previous version of DNSSEC, which
3830 is incompatible with the currently deployed version.
3832 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3833 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3834 <arpa/nameser.h> header file because the distinction between RR types and
3835 meta-RR types is not officially standardized, subject to revision, and
3836 thus not suitable for encoding in a macro.
3838 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3839 and rhook members of the res_state type in <resolv.h> have been removed.
3840 The glibc stub resolver did not support these hooks, but the header file
3841 did not reflect that.
3843 * For multi-arch support it is recommended to use a GCC which has
3844 been built with support for GNU indirect functions. This ensures
3845 that correct debugging information is generated for functions
3846 selected by IFUNC resolvers. This support can either be enabled by
3847 configuring GCC with '--enable-gnu-indirect-function', or by
3848 enabling it by default by setting 'default_gnu_indirect_function'
3849 variable for a particular architecture in the GCC source file
3852 * GDB pretty printers have been added for mutex and condition variable
3853 structures in POSIX Threads. When installed and loaded in gdb these pretty
3854 printers show various pthread variables in human-readable form when read
3855 using the 'print' or 'display' commands in gdb.
3857 * Tunables feature added to allow tweaking of the runtime for an application
3858 program. This feature can be enabled with the '--enable-tunables' configure
3859 flag. The GNU C Library manual has details on usage and README.tunables has
3860 instructions on adding new tunables to the library.
3862 * A new version of condition variables functions have been implemented in
3863 the NPTL implementation of POSIX Threads to provide stronger ordering
3866 * A new version of pthread_rwlock functions have been implemented to use a more
3867 scalable algorithm primarily through not using a critical section anymore to
3870 Security related changes:
3872 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3873 have been created with makecontext could fail to terminate due to a
3874 missing .cantunwind annotation. This has been observed to lead to a hang
3875 (denial of service) in some Go applications compiled with gccgo. Reported
3876 by Andreas Schwab. (CVE-2016-6323)
3878 * The DNS stub resolver functions would crash due to a NULL pointer
3879 dereference when processing a query with a valid DNS question type which
3880 was used internally in the implementation. The stub resolver now uses a
3881 question type which is outside the range of valid question type values.
3884 The following bugs are resolved with this release:
3886 [4099] stdio: Overly aggressive caching by stream i/o functions.
3887 [7065] build: Support building glibc with -fstack-protector or -fstack-
3889 [9842] localedata: en_CA: incorrect date format
3890 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3891 before it started waiting
3892 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3893 [15765] nptl: sem_open is wrongly a cancellation point
3894 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3895 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3897 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3898 library linked with pthread
3899 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3900 "FIXME: Ingo" issue)
3901 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3902 [17252] libc: getrandom and getentropy syscall
3903 [17730] malloc: thread-local storage is sometimes improperly free()'d
3904 after being __libc_memalign()'d
3905 [18241] stdio: failed fseek on memstream does not set errno and can fail
3907 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3909 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3910 PTHREAD_PRIO_INHERIT mutex on ARM
3911 [18784] network: res_query and related function crash for special record
3912 type queries (CVE-2015-5180)
3913 [19380] math: strtod does not raise "inexact"
3914 [19387] string: Integer overflow in memchr
3915 [19390] string: Integer overflow in strncat
3916 [19398] build: linknamespace tests fail with massively parallel build
3917 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3919 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3920 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3921 [19514] libc: [PATCH] Fix spelling errors in spelling
3922 "implement"/"implementation" in several places
3923 [19582] network: Deprecate RES_USE_INET6
3924 [19673] manual: clog10 docs appear to be erroneous
3925 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3926 causes a segmentation fault
3927 [19826] libc: invalid pointer returned from __tls_get_addr with static
3929 [20016] network: resolv: Remove hooks support from the API
3930 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3932 [20033] math: [x86_64] vectorized math function don't call the __finite
3934 [20116] nptl: use after free in pthread_create
3935 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3936 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3938 [20311] nptl: please install proc_service.h
3939 [20366] libc: Compilation errors in installed headers in strict-compliance
3941 [20370] malloc: malloc: Arena free list management is still racy
3942 (incorrect fix in bug 19243)
3943 [20386] libc: assert (X = 0) does not result in GCC warning
3944 [20432] malloc: malloc: Minimize interface required for interposition
3945 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3946 in _Unwind_Backtrace (CVE-2016-6323)
3947 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3948 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3950 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3951 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3952 [20477] network: resolv: incorrect double-checked locking related to
3954 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3956 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3958 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3959 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3960 cause transition penalty
3961 [20517] math: sparcv9 missing fdiml compat symbol
3962 [20524] manual: strverscmp is inconsistent
3963 [20525] libc: <sys/quota.h> should be based on kernel headers
3964 [20539] math: GCC 7 -static -lm fails to link at -O3
3965 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3967 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3969 [20591] network: Remove obsolete DNSSEC support
3970 [20592] network: DNS resource record type classification macros in
3971 <arpa/nameser.h> are incorrect
3972 [20593] network: Update DNS RR type definitions
3973 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3974 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3976 [20629] network: libresolv: Remove support for bitstring labels
3978 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3979 assertion: "maxidx >= 2"
3980 [20660] math: [arm] Use VSQRT
3981 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3982 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3983 [20689] libc: Test for FMA should also check for AVX.
3984 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3985 [20715] math: iszero macro breaks existing code
3986 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3987 [20728] libc: powerpc: Missing TOC stub in clone
3988 [20729] build: glibc-2.24 fails to build for i486 with -Os
3989 [20750] build: Build fails with default PIE enabled gcc-6.x
3990 [20768] math: [alpha] sqrt fegetenv namespace
3991 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3993 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3994 __FLT_EVAL_METHOD__ is 2
3995 [20790] network: rpcgen buffer overrun in get_prog_declaration
3996 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3997 [20829] libc: crypt snprintf namespace
3998 [20847] libc: tst-vfork3 failure
3999 [20855] math: Default bits/mathdef.h has inappropriate float_t
4000 [20859] math: [sh4] FP_ILOGB0 invalid
4001 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
4002 U+20AC), not same as GBK
4003 [20915] dynamic-link: global-dynamic TLS broken on aarch64
4004 [20916] math: pow handling of sNaN arguments
4005 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
4006 [20919] math: Bad pow (qNaN, 0) result with -lieee
4007 [20940] math: hypot sNaN handling
4008 [20947] math: fmax, fmin sNaN handling
4009 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4010 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4012 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4013 [20973] nptl: robust mutexes: Lost wake-ups
4014 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4015 [20978] nis: strlen on null pointer in nss_nisplus
4016 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4018 [21014] string: i686 memchr overflows internal pointer check
4019 [21019] libc: [mips] n32 lseek incorrect on overflow
4020 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4021 [21026] libc: [MIPS] readahead syscall is broken on n64
4022 [21028] math: Fallback fesetexceptflag should always succeed
4023 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4024 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4026 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4027 [21061] librt: [microblaze] librt lost clock_* exports
4028 [21073] libc: tunables: insecure environment variables passed to
4029 subprocesses with AT_SECURE
4030 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4034 * The minimum Linux kernel version that this version of the GNU C Library
4035 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4036 kernel version 2.6.32 or later suffices (on architectures that already
4037 required kernel versions more recent than 3.2, those requirements remain
4038 unchanged). Linux 3.2 or later kernel headers are required on all
4041 * The pap_AN locale has been deleted. This has been deprecated for a long
4042 time. It has been replaced by pap_AW & pap_CW, both of which have long
4043 been included in previous releases.
4045 * The readdir_r and readdir64_r functions have been deprecated. It is
4046 recommended to use readdir and readdir64 instead.
4048 * The type “union wait” has been removed. It was deprecated in the early
4049 1990s and never part of POSIX. Application code should use the int type
4050 instead of “union wait”.
4052 * A new NSS action is added to facilitate large distributed system
4053 administration. The action, MERGE, allows remote user stores like LDAP
4054 to be merged into local user stores like /etc/groups in order to provide
4055 easy to use, updated, and managed sets of merged credentials. The new
4056 action can be used by configuring it in /etc/nsswitch.conf:
4057 group: files [SUCCESS=merge] nis
4058 Implemented by Stephen Gallagher (Red Hat).
4060 * The deprecated __malloc_initialize_hook variable has been removed from the
4063 * The long unused localedef --old-style option has been removed. It hasn't
4064 done anything in over 16 years. Scripts using this option can safely
4067 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4068 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4069 return the next representable value in the direction of positive infinity
4070 and the nextdown functions return the next representable value in the
4071 direction of negative infinity. These are currently enabled as GNU
4074 Security related changes:
4076 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4077 could result in a stack overflow when getnetbyname was called with an
4078 overly long name. (CVE-2016-3075)
4080 * Previously, getaddrinfo copied large amounts of address data to the stack,
4081 even after the fix for CVE-2013-4458 has been applied, potentially
4082 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4083 instead. Reported by Michael Petlan. (CVE-2016-3706)
4085 * The glob function suffered from a stack-based buffer overflow when it was
4086 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4087 Reported by Alexander Cherepanov. (CVE-2016-1234)
4089 * The Sun RPC UDP client could exhaust all available stack space when
4090 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4091 alloca plugin for GCC. (CVE-2016-4429)
4093 * The IPv6 name server management code in libresolv could result in a memory
4094 leak for each thread which is created, performs a failing naming lookup,
4095 and exits. Over time, this could result in a denial of service due to
4096 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4098 The following bugs are resolved with this release:
4100 [1170] localedata: ne_NP: update Nepali locale definition file
4101 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4103 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4104 [6796] math: fdim() does not set errno on overflow
4105 [10354] libc: posix_spawn should use vfork() in more cases than presently
4106 [11213] localedata: localedata: add copyright disclaimer to locale files
4107 [12143] localedata: chr_US: new Cherokee locale
4108 [12450] localedata: sgs_LT: new locale
4109 [12676] localedata: ln_CD: new locale
4110 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4112 [13304] math: fma, fmaf, fmal produce wrong results
4113 [14259] build: --localedir arg to configure is ignored
4114 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4115 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4116 [14934] localedata: es_CL: wrong first weekday chilean locale
4117 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4119 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4121 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4122 [15368] nptl: raise() is not async-signal-safe
4123 [15479] math: ceil, floor, round and trunc raise inexact exception
4124 [15578] localedata: kk_KZ: various updates
4125 [16003] localedata: pap_AN: punt old locale
4126 [16137] localedata: iw_IL: punt old locale
4127 [16190] localedata: eo: new esperanto locale
4128 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4129 [16742] malloc: race condition: pthread_atfork() called before first
4130 malloc() results in unexpected locking behaviour/deadlocks
4131 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4133 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4134 [17565] localedata: pt_PT: wrong (work-)week start
4135 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4136 [17950] build: Build fails with -msse
4137 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4138 [18433] libc: posix_spawn does not return correctly upon failure to
4140 [18453] localedata: charmaps/IBM875: incorrect codes
4141 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4143 [18896] localedata: he_IL: improvements for currency
4144 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4145 Romanian locale data
4146 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4148 [19056] libc: Deprecate readdir_r
4149 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4151 [19198] localedata: nl_NL: small improvements for Dutch locales
4152 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4153 nameservers (CVE-2016-5417)
4154 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4156 [19400] locale: Language missing in "iso-639.def", trivial fix in
4158 [19431] malloc: Deadlock between fflush, getdelim, and fork
4159 [19505] libc: Incorrect file descriptor validity checks in
4160 posix_spawn_file_actions_add{open,close,dup2}
4161 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4162 when using RTLD_NEXT
4163 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4164 `intl/{gettextP,loadinfo}.h'
4165 [19534] libc: execle, execlp may use malloc
4166 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4167 [19573] network: res_nclose and __res_maybe_init disagree about name
4168 server initialization, breaking Hesiod
4169 [19575] localedata: Status of GB18030 tables
4170 [19581] localedata: sr_* date_fmt string contains additional newline
4171 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4173 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4174 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4175 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4176 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4178 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4180 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4182 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4183 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4184 [19633] locale: strfmon_l applies global locale to number formatting
4185 [19642] network: Memory leak in getnameinfo
4186 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4187 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4189 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4190 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4192 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4193 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4195 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4197 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4199 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4200 pointers and lengths in error-case.
4201 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4202 report errors on UTF-16 surrogates values.
4203 [19755] nscd: nscd assertion failure in gc
4204 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4205 [19759] libc: mempcpy shouldn't be inlined
4206 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4207 [19765] libc: s390 needs an optimized mempcpy
4208 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4209 NAME_MAX limit assumption (CVE-2016-1234)
4210 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4211 [19787] network: Missing and incorrect truncation checks in getnameinfo
4212 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4214 [19791] network: Assertion failure in res_query.c with un-connectable name
4216 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4217 [19822] math: libm.so install clobbers old version
4218 [19825] network: resolv: send_vc can return uninitialized data in second
4219 response to getaddrinfo
4220 [19830] network: nss_dns: should check RDATA length against buffer length
4221 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4222 confronted with A/AAAA records of invalid size
4223 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4224 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4225 [19853] stdio: Printing IBM long double in decimal with high precision is
4227 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4228 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4229 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4231 [19865] network: Assertion failure or memory leak in
4232 _nss_dns_getcanonname_r
4233 [19868] network: nss_dns: netent code does not skip over non-PTR records
4234 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4236 [19881] string: Improve x86-64 memset
4237 [19907] string: Incorrect memcpy tests
4238 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4240 [19925] libc: termios.h XCASE namespace
4241 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4242 [19929] libc: limits.h NL_NMAX namespace
4243 [19931] stdio: Memory leak in vfprintf
4244 [19957] libc: clone(CLONE_VM) access invalid parent memory
4245 [19963] localedata: en_IL: New locale
4246 [19989] stdio: stdio.h cuserid namespace
4247 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4249 [19996] locale: langinfo.h nl_langinfo_l namespace
4250 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4251 [20010] network: getaddrinfo: Stack overflow in hostent translation
4253 [20012] stdio: libio: fmemopen append mode failure
4254 [20014] stdio: stdio.h namespace for pre-threads POSIX
4255 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4256 [20023] libc: fcntl.h timespec namespace
4257 [20024] math: [x86_64] vectorized sincos trashes the stack
4258 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4259 [20041] time: sys/time.h timespec namespace
4260 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4261 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4262 [20051] libc: ttyslot in wrong header under wrong conditions
4263 [20054] libc: gethostname not declared for XPG4
4264 [20055] libc: termios.h missing tcgetsid for XPG4
4265 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4267 [20073] libc: sys/stat.h fchmod namespace
4268 [20074] libc: stdlib.h rand_r namespace
4269 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4270 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4272 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4273 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4275 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4276 [20119] libc: Wrong mask for processors level type from CPUID
4277 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4278 AS not supporting AVX512
4279 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4281 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4282 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4284 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4285 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4286 [20178] libc: posix_spawn{p} should not call exit
4287 [20191] stdio: libio: vtables hardening
4288 [20195] string: FMA4 detection requires CPUID execution with register
4290 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4291 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4293 [20212] math: acos (sNaN) returns sNaN
4294 [20213] math: asin (sNaN) returns sNaN
4295 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4296 [20218] math: [i386] asinhl (sNaN) returns sNaN
4297 [20219] math: [i386] atanhl (sNaN) returns sNaN
4298 [20222] stdio: fopencookie: Mangle function pointers
4299 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4300 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4301 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4303 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4304 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4305 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4306 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4307 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4308 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4309 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4310 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4311 [20240] math: modf (sNaN) returns sNaN
4312 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4313 [20250] math: frexp (sNaN) returns sNaN
4314 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4315 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4317 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4318 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4319 subscript is below array bounds [-Werror=array-bounds]
4320 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4321 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4323 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4324 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4326 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4327 "invalid" exceptions
4328 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4329 [20316] localedata: id_ID: Februari instead of Pebruari
4330 [20327] string: POWER8 strcasecmp returns incorrect result
4331 [20347] math: Failure: Test: j0_downward (0xap+0)
4332 [20348] libc: FAIL: misc/tst-preadvwritev64
4333 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4334 [20350] libc: There is no test for p{read,write}64
4335 [20357] math: Incorrect cos result for 1.5174239687223976
4336 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4340 * Unicode 8.0.0 Support: Character encoding, character type info, and
4341 transliteration tables are all updated to Unicode 8.0.0, using new
4342 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4343 These updates cause user visible changes, such as the fixes for bugs
4344 89, 16061, and 18568.
4346 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4347 kernel-internal CPU set size. This means that requests that change the
4348 CPU affinity which failed before (for example, an all-ones CPU mask) will
4349 now succeed. Applications that need to determine the effective CPU
4350 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4351 setting it because the kernel can adjust it (and the previous size check
4352 would not detect this in the majority of cases).
4354 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4355 the following new symbols are used: fts64_children, fts64_close,
4356 fts64_open, fts64_read and fts64_set.
4358 * getaddrinfo now detects certain invalid responses on an internal netlink
4359 socket. If such responses are received, an affected process will
4360 terminate with an error message of "Unexpected error <number> on netlink
4361 descriptor <number>" or "Unexpected netlink response of size <number> on
4362 descriptor <number>". The most likely cause for these errors is a
4363 multi-threaded application which erroneously closes and reuses the netlink
4364 file descriptor while it is used by getaddrinfo.
4366 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4367 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4368 unnecessary serialization of memory allocation requests across threads.
4369 The defect is now corrected. Users should see a substantial increase in
4370 the concurent throughput of allocation requests for applications which
4371 trigger this bug. Affected applications typically create and
4372 destroy threads frequently. (Bug 19048 was reported and analyzed by
4375 * There is now a --disable-timezone-tools configure option for disabling the
4376 building and installing of the timezone related utilities (zic, zdump, and
4377 tzselect). This is useful for people who build the timezone data and code
4378 independent of the GNU C Library.
4380 * The obsolete header <regexp.h> has been removed. Programs that require
4381 this header must be updated to use <regex.h> instead.
4383 * The obsolete functions bdflush, create_module, get_kernel_syms,
4384 query_module and uselib are no longer available to newly linked binaries;
4385 the header <sys/kdaemon.h> has been removed. These functions and header
4386 were specific to systems using the Linux kernel and could not usefully be
4387 used with the GNU C Library on systems with version 2.6 or later of the
4390 * Optimized string, wcsmbs and memory functions for IBM z13.
4391 Implemented by Stefan Liebler.
4393 * Newly linked programs that define a variable called signgam will no longer
4394 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4395 require signgam to be set by those functions must ensure that they use the
4396 variable provided by the GNU C Library and declared in <math.h>, without
4397 defining their own copy.
4399 * The minimum GCC version that can be used to build this version of the GNU
4400 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4401 still be used to compile programs using the GNU C Library.
4403 Security related changes:
4405 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4406 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4408 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4409 the pointer guard feature. It is always enabled. Previously,
4410 LD_POINTER_GUARD could be used to disable security hardening in binaries
4411 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4414 * An integer overflow in hcreate and hcreate_r could lead to an
4415 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4417 * The catopen function no longer has unbounded stack usage. Reported by
4418 Max. (CVE-2015-8779)
4420 * The nan, nanf and nanl functions no longer have unbounded stack usage
4421 depending on the length of the string passed as an argument to the
4422 functions. Reported by Joseph Myers. (CVE-2014-9761)
4424 * A stack-based buffer overflow was found in libresolv when invoked from
4425 libnss_dns, allowing specially crafted DNS responses to seize control
4426 of execution flow in the DNS client. The buffer overflow occurs in
4427 the functions send_dg (send datagram) and send_vc (send TCP) for the
4428 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4429 family. The use of AF_UNSPEC triggers the low-level resolver code to
4430 send out two parallel queries for A and AAAA. A mismanagement of the
4431 buffers used for those queries could result in the response of a query
4432 writing beyond the alloca allocated buffer created by
4433 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4434 the overflow. Thanks to the Google Security Team and Red Hat for
4435 reporting the security impact of this issue, and Robert Holiday of
4436 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4438 The following bugs are resolved with this release:
4440 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4441 [887] math: Math library function "logb" and "nextafter" inconsistent
4442 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4443 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4444 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4445 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4447 [4404] localedata: German translation of "Alarm clock" is misleading
4448 [6799] math: nextafter() and nexttoward() doen't set errno on
4449 overflow/underflow errors
4450 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4452 [10432] nis: _nss_nis_setnetgrent assertion failure
4453 [11460] libc: fts has no LFS support
4454 [12926] network: getaddrinfo()/make_request() may spin forever
4455 [13065] nptl: Race condition in pthread barriers
4456 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4457 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4459 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4460 [14912] libc: Rename non-installed bits/*.h headers
4461 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4462 [15367] math: Let gcc use __builtin_isinf
4463 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4464 [15421] math: lgamma wrongly sets signgam for ISO C
4465 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4466 FE_INVALID with argument out of range
4467 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4469 [15786] dynamic-link: ifunc resolver functions can smash function
4471 [15918] math: Unnecessary check for equality in hypotf()
4472 [16061] localedata: Review / update transliteration data
4473 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4475 [16141] time: strptime %z offset restriction
4476 [16171] math: drem should be alias of remainder
4477 [16296] math: fegetround is pure?
4478 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4479 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4481 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4482 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4484 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4485 "Exception "Inexact" set" on ppc32
4486 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4487 [16517] math: Missing underflow exception from tanf/tan/tanl
4488 [16519] math: Missing underflow exception from sinhf
4489 [16520] math: Missing underflow exception from tanhf
4490 [16521] math: Missing underflow exception from exp2
4491 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4493 [16734] stdio: fopen calls mmap to allocate its buffer
4494 [16961] math: nan function incorrect handling of bad sequences
4495 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4496 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4497 [16985] locale: localedef: confusing error message when opening output
4499 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4500 [17197] locale: Redundant shift character in iconv conversion output at
4502 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4503 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4504 [17250] dynamic-link: static linking breaks nss loading
4505 (getaddrinfo/getpwnam/etc...)
4506 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4508 [17441] math: isnan() should use __builtin_isnan() in GCC
4509 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4510 (related to lock elision)
4511 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4512 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4513 [17887] time: strptime should be able to parse "+01:00" style timezones
4514 [17905] libc: catopen() Multiple unbounded stack allocations
4516 [18084] libc: backtrace (..., 0) dumps core on x86
4517 [18086] libc: nice() sets errno to 0 on success
4518 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4519 is too large (CVE-2015-8778)
4520 [18251] dynamic-link: SONAME missing when audit modules provides path
4521 [18265] libc: add attributes for wchar string and memory functions
4522 [18370] math: csqrt missing underflows
4523 [18421] libc: [hppa] read-only segment has dynamic relocations
4524 [18472] libc: Obsolete syscall wrappers should be compat symbols
4525 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4526 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4527 [18525] localedata: Remove locale timezone information
4528 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4529 [18568] localedata: Update locale data to Unicode 8.0
4530 [18589] locale: sort-test.sh fails at random
4531 [18595] math: ctan, ctanh missing underflows
4532 [18604] libc: assert macro-expands its argument
4533 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4534 contains a vector instruction exception.
4535 [18611] math: j1, jn missing errno setting on underflow
4536 [18618] localedata: sync Chechen locale definitions with other *_RU
4538 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4539 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4540 [18665] network: In send_dg, the recvfrom function is NOT always using the
4541 buffer size of a newly created buffer (CVE-2015-7547)
4542 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4544 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4546 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4547 [18699] math: tilegx cproj() for various complex infinities does not yield
4549 [18724] libc: Harden put*ent functions against data injection
4550 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4551 [18755] build: build errors with -DNDEBUG
4552 [18757] stdio: fmemopen fails to set errno on failure
4553 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4555 [18781] libc: openat64 lacks O_LARGEFILE
4556 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4557 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4558 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4559 [18790] math: [ldbl-128ibm] tanhl inaccurate
4560 [18795] libc: stpncpy fortification misses buffer lengths that are
4561 statically too large
4562 [18796] build: build fails for --disable-mathvec
4563 [18803] math: hypot missing underflows
4564 [18820] stdio: fmemopen may leak memory on failure
4565 [18823] math: csqrt spurious underflows
4566 [18824] math: fma spurious underflows
4567 [18825] math: pow missing underflows
4568 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4569 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4570 [18870] build: sem_open.c fails to compile with missing symbol
4572 [18872] stdio: Fix memory leak in printf_positional
4573 [18873] libc: posix_fallocate overflow check ineffective
4574 [18875] math: Excess precision leads incorrect libm
4575 [18877] libc: arm: mmap offset regression
4576 [18887] libc: memory corruption when using getmntent on blank lines
4577 [18918] localedata: hu_HU: change time to HH:MM:SS format
4578 [18921] libc: Regression: extraneous stat() and fstat() performed by
4580 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4581 binaries (CVE-2015-8777)
4582 [18951] math: tgamma missing underflows
4583 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4585 [18953] localedata: lt_LT: change currency symbol to the euro
4586 [18956] math: powf inaccuracy
4587 [18961] math: [i386] exp missing underflows
4588 [18966] math: [i386] exp10 missing underflows
4589 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4590 [18969] build: multiple string test failures due to missing locale
4592 [18970] libc: Reference of pthread_setcancelstate in libc.a
4593 [18977] math: float / long double Bessel functions not in XSI POSIX
4594 [18980] math: i386 libm functions return with excess range and precision
4595 [18981] math: i386 scalb*, ldexp return with excess range and precision
4596 [18982] stdio: va_list and vprintf
4597 [18985] time: Passing out of range data to strftime() causes a segfault
4599 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4600 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4601 [19012] locale: iconv_open leaks memory on error path
4602 [19016] math: clog, clog10 inaccuracy
4603 [19018] nptl: Mangle function pointers in tls_dtor_list
4604 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4605 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4606 [19048] malloc: malloc: arena free list can become cyclic, increasing
4608 [19049] math: [powerpc] erfc incorrect zero sign
4609 [19050] math: [powerpc] log* incorrect zero sign
4610 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4611 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4612 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4613 [19074] network: Data race in _res_hconf_reorder_addrs
4614 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4615 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4616 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4618 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4620 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4621 [19086] manual: posix_fallocate64 documented argument order is wrong.
4622 [19088] math: lround, llround missing exceptions close to overflow
4624 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4625 [19095] math: dbl-64 lrint incorrect for 64-bit long
4626 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4627 [19124] dynamic-link: ld.so failed to build with older assmebler
4628 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4629 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4630 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4631 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4632 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4633 pthread_setaffinity_np
4634 [19156] math: [ldbl-128] j0l spurious underflows
4635 [19164] nptl: tst-getcpu fails with many possible CPUs
4636 [19168] math: math/test-ildoubl and math/test-ldouble failure
4637 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4638 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4640 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4641 (FE_NOMASK_ENV) do not clear SSE exceptions
4642 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4643 _int_new_arena/reused_arena
4644 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4645 [19201] math: dbl-64 remainder incorrect sign of zero result
4646 [19205] math: bits/math-finite.h conditions do not match math.h and
4648 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4649 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4650 for C99-based standards
4651 [19212] libc: features.h not -Wundef clean
4652 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4654 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4655 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4656 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4658 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4659 "inexact" exceptions
4660 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4662 [19242] libc: strtol incorrect in Turkish locales
4663 [19243] malloc: reused_arena can pick an arena on the free list, leading
4664 to an assertion failure and reference count corruption
4665 [19253] time: tzset() ineffective when temporary TZ did not include DST
4667 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4668 [19270] math: [hppa] Shared libm missing __isnanl
4669 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4670 MAP_HUGETLB and MAP_STACK defines
4671 [19313] nptl: Wrong __cpu_mask for x32
4672 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4673 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4674 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4675 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4676 [19363] time: x32: times() return value wrongly truncates/sign extends
4678 [19367] dynamic-link: Improve branch prediction on Silvermont
4679 [19369] network: Default domain name not reset by res_ninit when "search"
4680 / "domain" entry is removed from resolv.conf
4681 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4683 [19385] localedata: bg_BG: time separator should be colon, not comma
4684 [19408] libc: linux personality syscall wrapper may erroneously return an
4685 error on 32-bit architectures
4686 [19415] libc: dladdr returns wrong names on hppa
4687 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4688 IBM905, IBM907, and IBM909
4689 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4690 [19443] build: build failures with -DDEBUG
4691 [19451] build: Make check fails on test-double-vlen2
4692 [19462] libc: Glibc failed to build with -Os
4693 [19465] math: Wrong code with -Os
4694 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4696 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4698 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4699 [19486] math: S390: Math tests fail with "Exception Inexact set".
4700 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4701 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4703 [19590] math: Fail to build shared objects that use libmvec.so functions.
4707 * The following bugs are resolved with this release:
4709 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4710 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4711 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4712 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4713 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4714 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4715 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4716 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4717 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4718 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4719 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4720 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4721 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4722 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4723 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4724 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4725 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4726 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4727 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4728 18657, 18676, 18694, 18696, 18887.
4730 * Cache information can be queried via sysconf() function on s390 e.g. with
4731 _SC_LEVEL1_ICACHE_SIZE as argument.
4733 * A buffer overflow in gethostbyname_r and related functions performing DNS
4734 requests has been fixed. If the NSS functions were called with a
4735 misaligned buffer, the buffer length change due to pointer alignment was
4736 not taken into account. This could result in application crashes or,
4737 potentially arbitrary code execution, using crafted, but syntactically
4738 valid DNS responses. (CVE-2015-1781)
4740 * The time zone file parser has been made more robust against crafted time
4741 zone files, avoiding heap buffer overflows related to the processing of
4742 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4743 large time zone data files. Overly long time zone specifiers in the TZ
4744 variable no longer result in stack overflows and crashes.
4746 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4747 for LD and GD on x86 and x86-64, has been implemented. You will need
4748 binutils-2.24 or later to enable this optimization.
4750 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4751 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4752 Hat). These updates cause user visible changes, such as the fix for bug
4755 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4756 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4757 condition in some applications.
4759 * Added vector math library named libmvec with the following vectorized x86_64
4760 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4762 The library can be disabled with --disable-mathvec. Use of the functions is
4763 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4764 Shared library libmvec.so is linked in as needed when using -lm (no need to
4765 specify -lmvec explicitly for not static builds).
4766 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4768 * A new fmemopen implementation has been added with the goal of POSIX
4769 compliance. The new implementation fixes the following long-standing
4770 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4771 old implementation is still present for use be by existing binaries.
4773 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4774 releases. It has been fixed to match 2.19 and older, but binaries built
4775 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4777 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4778 Contributed by Roland McGrath (Google).
4780 * The header <regexp.h> is deprecated, and will be removed in a future
4781 release. Use of this header will trigger a deprecation warning.
4782 Application developers should update their code to use <regex.h> instead.
4784 This header was formerly part of SUS, but was deprecated in 1994 and
4785 removed from the standard in 2001. Also, the glibc implementation
4786 leaks memory. See BZ#18681 for more details.
4790 * The following bugs are resolved with this release:
4792 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4793 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4794 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4795 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4796 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4797 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4798 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4799 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4800 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4801 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4804 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4805 too little memory for the to-be-scanned arguments and overflow the
4806 allocated buffer. The implementation now correctly computes the required
4807 buffer size when using malloc, and switches to malloc from alloca as
4810 * A new semaphore algorithm has been implemented in generic C code for all
4811 machines. Previous custom assembly implementations of semaphore were
4812 difficult to reason about or ensure that they were safe. The new version
4813 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4814 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4815 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4817 * Port to Altera Nios II has been contributed by Mentor Graphics.
4819 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4820 implementations for powerpc64/powerpc64le.
4821 Implemented by Adhemerval Zanella (IBM).
4823 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4824 and powerpc64le. This may improve lock scaling of existing programs on
4825 HTM capable systems. The lock elision code is only enabled with
4826 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4827 powerpc will issue a transaction abort on every syscall to avoid side
4828 effects being visible outside transactions.
4830 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4831 AArch64. Contributed by ARM Ltd.
4833 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4835 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4836 under certain input conditions resulting in the execution of a shell for
4837 command substitution when the application did not request it. The
4838 implementation now checks WRDE_NOCMD immediately before executing the
4839 shell and returns the error WRDE_CMDSUB as expected.
4841 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4842 processing format strings with a large number of format specifiers.
4844 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4845 infinite loop if the DNS response contained a PTR record of an unexpected
4848 * The minimum GCC version that can be used to build this version of the GNU
4849 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4850 still be used to compile programs using the GNU C Library.
4852 * The GNU C Library is now built with -Werror by default. This can be
4853 disabled by configuring with --disable-werror.
4855 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4857 * The obsolete sigvec function has been removed. This was the original
4858 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4859 programs have been using instead for about 25 years. Of course, ABI
4860 compatibility for old binaries using sigvec remains intact.
4862 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4863 with newer versions of bison.
4865 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4866 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4867 registers overlay two consecutive single-precision registers. MIPS32R2
4868 introduced a new FPU mode (FR=1) where double-precision registers extend the
4869 corresponding single-precision registers which is incompatible with the
4870 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4871 require the use of FR=1 making a transition necessary. New o32 ABI
4872 extensions enable users to migrate over time from the original o32 ABI
4873 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4874 tracks the ABI of any loaded object and verifies that new objects are
4875 compatible. Mode transitions will also be requested as required and
4876 unsupportable objects will be rejected. The ABI checks include both soft and
4877 hard float ABIs for o32, n32 and n64.
4879 GCC 5 with GNU binutils 2.25 onwards:
4880 It is strongly recommended that all o32 system libraries are built using the
4881 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4882 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4883 compiler using --with-fp-32=xx to set this by default.
4887 * The following bugs are resolved with this release:
4889 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4890 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4891 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4892 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4893 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4894 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4895 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4896 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4897 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4898 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4899 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4900 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4901 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4902 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4903 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4905 * Reverted change of ABI data structures for s390 and s390x:
4906 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4907 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4908 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4909 are preserved pointing straight to the same implementation as the old ones.
4910 Given that, new callers will simply provide a too-big buffer to these
4911 functions. Any applications/libraries out there that embed jmp_buf or
4912 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4913 against 2.19 headers will have to rebuilt again. This is necessary in any
4914 case to revert the breakage in their ABI caused by the glibc change.
4916 * Support for file description locks is added to systems running the
4917 Linux kernel. The standard file locking interfaces are extended to
4918 operate on file descriptions, not file descriptors, via the use of
4919 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4920 are associated with an open file instead of a process.
4922 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4924 * The minimum Linux kernel version that this version of the GNU C Library
4925 can be used with is 2.6.32.
4927 * Running the testsuite no longer terminates as soon as a test fails.
4928 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4929 with PASS or FAIL lines for individual tests. A summary of the results is
4930 printed, including a list of failing lists, and "make check" exits with
4931 error status if there were any unexpected failures. "make check
4932 stop-on-test-failure=y" may be used to keep the old behavior.
4934 * The am33 port, which had not worked for several years, has been removed
4937 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4938 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4939 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4940 conflicted with POSIX (support for which was removed in 2.19), the
4941 interfaces those macros enabled remain available when compiling with
4942 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4943 test macros defined.
4945 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4947 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4948 This may improve lock scaling of existing programs on TX capable systems.
4949 The lock elision code is only built with --enable-lock-elision=yes and
4950 then requires a GCC version supporting the TX builtins. With lock elision
4951 default mutexes are elided via __builtin_tbegin, if the cpu supports
4952 transactions. By default lock elision is not enabled and the elision code
4955 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4956 copy the path argument. This allowed programs to cause posix_spawn to
4957 deference a dangling pointer, or use an unexpected pathname argument if
4958 the string was modified after the posix_spawn_file_actions_addopen
4961 * All supported architectures now use the main glibc sysdeps directory
4962 instead of some being in a separate "ports" directory (which was
4963 distributed separately before glibc 2.17).
4965 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4966 On configurations that support it (all Linux configurations), it's now
4967 used regardless of the --enable-add-ons switch to configure. It is no
4968 longer possible to build such configurations without pthreads support.
4970 * Locale names, including those obtained from environment variables (LANG
4971 and the LC_* variables), are more tightly checked for proper syntax.
4972 setlocale will now fail (with EINVAL) for locale names that are overly
4973 long, contain slashes without starting with a slash, or contain ".." path
4974 components. (CVE-2014-0475) Previously, some valid locale names were
4975 silently replaced with the "C" locale when running in AT_SECURE mode
4976 (e.g., in a SUID program). This is no longer necessary because of the
4979 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4980 with application code using Intel MPX instructions. (With all previous
4981 versions, the MPX register state could be clobbered when making calls
4982 into or out of a shared library.) Note that while the new dynamic
4983 linker is compatible with all known x86 hardware whether or not it
4984 supports Intel MPX, some x86 instruction-set emulators might fail to
4985 handle the new instruction encodings. This is known to affect Valgrind
4986 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4987 release), and might affect other tools that do instruction emulation.
4989 * Support for loadable gconv transliteration modules has been removed.
4990 The support for transliteration modules has been non-functional for
4991 over a decade, and the removal is prompted by security defects. The
4992 normal gconv conversion modules are still supported. Transliteration
4993 with //TRANSLIT is still possible, and the //IGNORE specifier
4994 continues to be supported. (CVE-2014-5119)
4996 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4997 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4998 resulting a denial-of-service security vulnerability in applications which
4999 use functions related to iconv. (CVE-2014-6040)
5003 * The following bugs are resolved with this release:
5005 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
5006 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
5007 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
5008 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5009 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5010 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5011 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5012 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5013 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5014 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5015 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5016 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5017 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5018 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5019 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5020 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5021 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5022 16431, 16453, 16474, 16506, 16510, 16529
5024 * Slovenian translations for glibc messages have been contributed by the
5025 Translation Project's Slovenian team of translators.
5027 * The public headers no longer use __unused nor __block. This change is to
5028 support compiling programs that are derived from BSD sources and use
5029 __unused internally, and to support compiling with Clang's -fblock
5030 extension which uses __block.
5032 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5033 large collation sequences to optimize multiple passes. This cache
5034 computation may overflow for large collation sequences and may cause a
5035 stack or buffer overflow. This is now fixed to use a slower algorithm
5036 which does not use a cache if there is an integer overflow.
5038 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5039 rules for large collation sequences to optimize multiple passes and falls
5040 back to alloca if malloc fails, resulting in a possible stack overflow.
5041 The implementation now falls back to an uncached collation sequence lookup
5044 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5045 initialized for static applications resulting in the security feature
5046 being disabled. The pointer guard is now correctly initialized to a
5047 random value for static applications. Existing static applications need
5048 to be recompiled to take advantage of the fix (bug 15754).
5050 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5051 to the d_name member of struct dirent, or omit the terminating NUL
5052 character. (Bugzilla #14699).
5054 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5055 aligned_alloc functions could allocate too few bytes or corrupt the
5056 heap when passed very large allocation size values (Bugzilla #15855,
5059 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5060 for AF_INET6 has been fixed (Bugzilla #16072).
5062 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5063 pap_CW, quz_PE, the_NP.
5065 * Substantially revised locales: gd_GB, ht_HT
5067 * The LC_ADDRESS field was updated to support country_car for almost all
5070 * ISO 1427 definitions were updated.
5072 * ISO 3166 definitions were updated.
5074 * The localedef utility now supports --big-endian and --little-endian
5075 command-line options to generate locales for a different system from that
5076 for which the C library was built.
5078 * Binary locale files now only depend on the endianness of the system for
5079 which they are generated and not on other properties of that system. As a
5080 consequence, binary files generated with new localedef may be incompatible
5081 with old versions of the GNU C Library, and binary files generated with
5082 old localedef may be incompatible with this version of the GNU C Library,
5083 in the following circumstances:
5085 + Locale files may be incompatible on m68k systems.
5087 + Locale archive files (but not separate files for individual locales) may
5088 be incompatible on systems where plain "char" is signed.
5090 * The configure option --disable-versioning has been removed. Builds with
5091 --disable-versioning had not worked for several years.
5093 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5094 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5096 * SystemTap probes for malloc have been introduced.
5098 * SystemTap probes for slow multiple precision fallback paths of
5099 transcendental functions have been introduced.
5101 * Support for powerpc64le has been added.
5103 * The soft-float powerpc port now supports e500 processors.
5105 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5107 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5108 set of header declarations that are enabled by default, even when other
5109 feature test macros or compiler options such as -std=c99 would otherwise
5110 disable some of those declarations.
5112 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5113 conflict with POSIX. The libbsd-compat library (which was a dummy library
5114 that did nothing) has also been removed.
5116 * Preliminary documentation about Multi-Thread, Async-Signal and
5117 Async-Cancel Safety has been added.
5119 * Change of ABI data structures for s390 and s390x:
5120 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5121 allow for future hardware extensions. All library functions that accept or
5122 return these structures were versioned in order to provide backwards
5123 compatibility with existing code. However, not all cases can be handled
5124 with interface versioning. If an application embeds either structure into
5125 another structure and that structure is passed to another compilation unit
5126 which expects the newer larger-sized object then any access to the new
5127 fields will result in undefined behaviour. Similarly any access to fields
5128 that were moved by the enlarging of the structures will cause undefined
5129 behaviour. To fix the undefined behaviour all objects that are part of the
5130 final in-memory image must agree on the size of structures, and this may
5131 require recompilation.
5135 * The following bugs are resolved with this release:
5137 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5138 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5139 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5140 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5141 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5142 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5143 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5144 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5145 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5146 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5147 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5148 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5149 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5152 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5153 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5154 Distributions can re-enable building and using pt_chown via the new configure
5155 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5156 considerable security risks and should only be used if the distribution
5157 understands and accepts the risks.
5159 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5162 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5163 fixed (Bugzilla #15330).
5165 * Add support for calling C++11 thread_local object destructors on thread
5166 and program exit. This needs compiler support for offloading C++11
5167 destructor calls to glibc.
5169 * Improved worst case performance of libm functions with double inputs and
5172 * Support for priority inherited mutexes in pthread condition variables on
5173 non-x86 architectures.
5175 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5177 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5179 * Optimized string functions for ARM. Implemented by Will Newton and
5182 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5184 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5187 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5188 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5190 * Added a benchmark framework to track performance of functions in glibc.
5192 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5193 It is based on draft TS 18661 and currently enabled as a GNU extension.
5195 * On Linux, the clock function now uses the clock_gettime system call
5196 for improved precision, rather than old times system call.
5198 * Added support for version-3 tz format files. This is needed when using
5199 the tz database release 2013e or later, and affects a few unusual cases --
5200 currently only TZ='America/Godthab' for time stamps after 2037.
5202 * Added new API functions pthread_getattr_default_np and
5203 pthread_setattr_default_np to get and set the default pthread
5204 attributes of a process.
5206 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5207 This may improve lock scaling of existing programs on TSX capable systems.
5208 When the --enable-lock-elision=yes parameter is specified at configure
5209 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5212 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5213 availability). Implemented by Ryan S. Arnold.
5215 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5219 * The following bugs are resolved with this release:
5221 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5222 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5223 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5224 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5225 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5226 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5227 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5228 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5229 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5230 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5231 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5232 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5233 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5234 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5235 14879, 14889, 14893, 14898, 14914.
5237 * Optimization of memcpy for MIPS.
5239 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5240 EMFILE has been fixed (Bugzilla #14889).
5242 * The add-on ports collection is now distributed in the "ports" subdirectory
5243 of the main GNU C Library distribution, rather than separately.
5245 * Port to ARM AArch64 contributed by Linaro.
5247 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5248 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5250 Implemented by Andreas Krebbel.
5252 * The new function secure_getenv allows secure access to the environment,
5253 returning NULL if running in a SUID/SGID process. This function replaces
5254 the internal function __secure_getenv.
5256 * SystemTap static probes have been added into the dynamic linker.
5257 Implemented by Gary Benson.
5259 * Optimizations of string functions strstr, strcasestr and memmem.
5260 Implemented by Maxim Kuvyrkov.
5262 * The minimum Linux kernel version that this version of the GNU C Library
5263 can be used with is 2.6.16.
5265 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5266 powerpc POWER7. Implemented by Will Schmidt.
5268 * New configure option --disable-nscd builds the C library such that it
5269 never attempts to contact the Name Service Caching Daemon (nscd).
5270 New configure option --disable-build-nscd avoids building nscd itself;
5271 this is the default if --disable-nscd is used.
5273 * Improved support for cross-compilation, including cross-testing and
5274 bootstrap builds without a previously built glibc.
5276 * Several testsuite tests are now able to test multiple IFUNC variants of an
5277 interface, rather than just testing the one that would be chooen by
5280 * New configure options --with-bugurl and --with-pkgversion, for
5281 distributors to use to embed their bug-reporting and package version
5282 information in --help and --version output.
5284 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5285 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5286 allows creation of chroots without the procfs mounted on /proc.
5288 * The `crypt' function now fails if passed salt bytes that violate the
5289 specification for those values. On Linux, the `crypt' function will
5290 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5291 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5292 when the mode is enabled.
5294 * The `clock_*' suite of functions (declared in <time.h>) is now available
5295 directly in the main C library. Previously it was necessary to link with
5296 -lrt to use these functions. This change has the effect that a
5297 single-threaded program that uses a function such as `clock_gettime' (and
5298 is not linked with -lrt) will no longer implicitly load the pthreads
5299 library at runtime and so will not suffer the overheads associated with
5300 multi-thread support in other code such as the C++ runtime library.
5302 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5307 * The following bugs are resolved with this release:
5309 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5310 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5311 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5312 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5313 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5314 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5315 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5316 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5317 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5318 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5319 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5320 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5321 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5322 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5323 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5324 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5325 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5326 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5327 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5328 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5329 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5330 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5333 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5334 configuring glibc with:
5335 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5336 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5337 Implemented by H.J. Lu.
5341 + define static_assert
5343 + do not declare gets
5345 + declare at_quick_exit and quick_exit also for ISO C11
5347 + aligned_alloc. NB: The code is deliberately allows the size parameter
5348 to not be a multiple of the alignment. This is a moronic requirement
5349 in the standard but it is only a requirement on the caller, not the
5352 + timespec_get added
5354 + uchar.h support added
5356 + CMPLX, CMPLXF, CMPLXL added
5358 Implemented by Ulrich Drepper.
5360 * Support for the IA-64 has been moved to ports.
5362 * Remove support for anything but ELF binary format
5364 * Checking versions of poll, ppoll added.
5365 Implemented by Ulrich Drepper.
5367 * More generic and 64-bit performance optimizations to math functions.
5368 Implemented by Ulrich Drepper.
5370 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5371 headers and functions available at compile time as they were before
5372 version 2.14. This option will be removed at some time in the future
5373 after the TI-RPC library becomes fully sufficient for the needs of
5374 existing applications.
5376 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5377 Note that glibc is not expected to work with any Linux kernel version
5380 * New header <sys/auxv.h> and function getauxval allowing easy access to
5381 the AT_* key-value pairs passed from the Linux kernel. The header also
5382 defines the HWCAP_* bits associated with the AT_HWCAP key.
5384 * New locales: mag_IN
5386 * New configure option --enable-systemtap builds SystemTap static probes
5387 into libc for setjmp and longjmp and into libpthread for various operations.
5388 So far the setjmp/longjmp probes and some of the libpthread probes are
5389 provided only for i*86 and x86_64.
5390 Implemented by Roland McGrath and Rayson Ho.
5392 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5394 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5397 * More optimized functions for SPARC. Implemented by David S. Miller.
5399 * Improved support for cross-compilation, especially bootstrap builds
5400 without a previously built glibc.
5402 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5403 Chris Metcalf from Tilera.
5405 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5406 now supported for ARM processors.
5408 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5409 as the name of the dynamic linker, to distinguish it from the
5410 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5412 * Support for CRIS has been removed from ports.
5414 * A new class of installed header has been documented for low-level
5415 platform-specific functionality. PowerPC added the first instance with a
5416 function to provide time base register access. Contributed by Tulio
5417 Magno Quites Machado Filho.
5419 * ix86 configurations now install header files that are consistent with
5420 what x86-64 configurations install. These same header files can be used
5421 for -m32, -m64, or -mx32 builds.
5422 Contributed by H.J. Lu.
5424 * Math library bug fixes. A thorough audit of all open math library bugs was
5425 conducted by Joseph Myers. Significant progress was made on many math
5426 library bugs resulting in more accurate exceptions and function results.
5427 Many thanks to all those that contributed including Andreas Jaeger for his
5428 patch review and work on the x87 trigonometric instruction issues.
5430 * Timezone data is no longer installed. Timezone-related binaries and scripts
5431 will continue to be installed. Users should obtain their timezone data from
5432 their distribution provider or from the tzdata package at
5433 <ftp://munnari.oz.au/pub/>.
5437 * The following bugs are resolved with this release:
5439 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5440 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5441 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5442 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5443 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5444 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5445 13484, 13506, 13515, 13523, 13524, 13538, 13540
5447 * New program pldd to list loaded object of a process
5448 Implemented by Ulrich Drepper.
5450 * Add nss_db support back to glibc. No more dependency on Berkeley db
5451 and support for initgroups lookups.
5452 Implemented by Ulrich Drepper.
5454 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5455 Contributed by HJ Lu.
5457 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5458 Contributed by HJ Lu.
5460 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5461 on x86-32 and x86-64.
5462 Contributed by Liubov Dmitrieva.
5464 * Optimized strchr and strrchr for SSE on x86-32.
5465 Contributed by Liubov Dmitrieva.
5467 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5468 for x86-64 and x86-32.
5469 Contributed by Liubov Dmitrieva.
5471 * New interfaces: scandirat, scandirat64
5472 Implemented by Ulrich Drepper.
5474 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5475 Implemented by Ulrich Drepper.
5477 * nscd now also caches the netgroup database.
5478 Implemented by Ulrich Drepper.
5480 * Integrate libm with gcc's -ffinite-math-only option.
5481 Implemented by Ulrich Drepper.
5483 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5484 to math functions. Implemented by Ulrich Drepper.
5486 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5487 Implemented by Ulrich Drepper.
5489 * New Linux interfaces: process_vm_readv, process_vm_writev
5491 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5492 Implemented by Ulrich Drepper.
5494 * Optimized nearbyint and strcasecmp for PPC.
5495 Implemented by Adhemerval Zanella.
5497 * New locales: bho_IN, unm_US, es_CU, ta_LK
5501 * The following bugs are resolved with this release:
5503 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5504 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5505 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5506 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5507 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5508 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5509 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5510 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5511 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5512 12795, 12811, 12813, 12814, 12841
5514 * The RPC implementation in libc is obsoleted. Old programs keep working
5515 but new programs cannot be linked with the routines in libc anymore.
5516 Programs in need of RPC functionality must be linked against TI-RPC.
5517 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5519 Visible changes of this change include (obviously) the inability to link
5520 programs using RPC functions without referencing the TI-RPC library and the
5521 removal of the RPC headers from the glibc headers.
5522 Implemented by Ulrich Drepper.
5524 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5525 syncfs, setns, sendmmsg
5527 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5528 yue_HK, lij_IT, mhr_RU
5530 * New encodings: CP770, CP771, CP772, CP773, CP774
5532 * New program sotruss to trace calls through PLTs
5533 Implemented by Ulrich Drepper.
5535 * The malloc hook implementation is marked deprecated and will be removed
5536 from the default implementation in the next version. The design never
5537 worked ever since the introduction of threads. Even programs which do
5538 not create threads themselves can use multiple threads created internally.
5542 * The following bugs are resolved with this release:
5544 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5545 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5546 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5547 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5550 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5552 * POWER7 optimizations: memset, memcmp, strncmp
5554 * New optimized string functions for x86-64: strnlen (SSE2),
5555 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5556 Implemented by Ulrich Drepper.
5560 * The following bugs are resolved with this release:
5562 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5563 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5564 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5565 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5566 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5567 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5568 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5569 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5571 * New interfaces: pthread_getname_np, pthread_setname_np
5573 * New Linux interface: recvmmsg
5575 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5577 * The dynamic linker now recognizes supported ABI versions from the
5578 EI_ABIVERSION field in the ELF header.
5579 Implemented by Ulrich Drepper.
5581 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5582 will not be used to fill in password fields in the passwd.byname replies.
5583 Instead it is used to synthesize the shadow.byname table, should it be
5584 missing. This is a useful mode in some installations involving Solaris.
5585 Implemented by Ulrich Drepper.
5587 * New locales: kok_IN, sq_MK, cv_RU
5591 * The following bugs are resolved with this release:
5593 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5594 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5595 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5596 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5597 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5598 10789, 10817, 10823, 10840, 10847
5600 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5602 Implemented by Ulrich Drepper.
5604 * Checking version of longjmp added that fails if an uninitialized stack
5605 frame would be created. Implemented by Ulrich Drepper.
5607 * STT_GNU_IFUNC is now supported in static executables.
5608 Implemented by H.J. Lu.
5610 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5612 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5613 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5614 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5615 Contributed by H.J. Lu.
5617 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5618 Implemented by Ulrich Drepper.
5620 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5622 Contributed by H.J. Lu.
5624 * Support for fma instruction in AVX on x86-64.
5625 Implemented by H.J. Lu and Ulrich Drepper.
5627 * AVX support in x86-64 auditing support in ld.so.
5628 Implemented by H.J. Lu.
5630 * STB_GNU_UNIQUE support added.
5631 Implemented by Ulrich Drepper.
5633 * Implement second fallback mode for optimized DNS lookup for even more
5634 broken environments. If two requests from the same port are not
5635 handled correctly close the socket and open a new one before sending
5636 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5637 can be used to select this mode right away, instead of rediscovering the
5638 necessity is every process again.
5639 Implemented by Ulrich Drepper.
5641 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5642 Implemented by Adam Tkac.
5644 * Optimized iconv conversions for S390x.
5645 Implemented by Andreas Krebbel.
5647 * Using condvars with PI mutexes is now more efficient due to kernel
5648 support for requeueing to PI futexes. NPTL support added for x86-64.
5649 Implemented by Ulrich Drepper.
5651 * New locales: ps_AF, my_MM
5655 * The following bugs are resolved with this release:
5657 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5658 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5659 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5660 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5661 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5663 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5664 Implemented by Ulrich Drepper.
5666 * New Linux interfaces: accept4, fallocate, fallocate64.
5667 Implemented by Ulrich Drepper.
5669 * Correct declarations of string function when used in C++ code. This
5670 could lead to compile errors for invalid C++ code.
5672 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5675 * New POSIX 2008 interface: psiginfo
5676 Implemented by Ulrich Drepper.
5678 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5679 Implemented by Ulrich Drepper.
5681 * Support for selecting between multiple function definitions at runtime
5682 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5684 * The libcrypt library can now use the hash function implementations in
5685 NSS. Implemented by Ulrich Drepper.
5687 * The malloc implementation can be compiled to be less memory efficient
5688 but higher performing in multi-threaded programs.
5689 Implemented by Ulrich Drepper.
5691 * New locales: nan_TW@latin, ks_IN
5693 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5694 Implemented by Ulrich Drepper.
5696 * Extended printf hook support. It is possible to use user-defined types
5697 and extend existing format specifiers.
5698 Implemented by Ulrich Drepper.
5700 * Handling for group shadow files has been added.
5701 Implemented by Ulrich Drepper.
5703 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5704 servers (the case, e.g., for some people using the built-in DNS
5705 server in ADSL modems/routers). There is a once-per-process timeout
5706 in case of a broken server. To avoid it, users can run nscd or put
5707 'options single-request' in /etc/resolv.conf.
5708 Implemented by Ulrich Drepper.
5712 * The following bugs are resolved with this release:
5714 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5715 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5716 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5717 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5718 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5720 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5721 up at the same time. Implemented by Ulrich Drepper.
5723 * TLS descriptors for LD and GD on x86 and x86-64.
5724 Implemented by Alexandre Oliva.
5726 * getaddrinfo now handles DCCP and UDPlite.
5727 Implemented by Ulrich Drepper.
5729 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5730 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5731 Implemented by Ulrich Drepper.
5733 * New implementation of memmem, strstr, and strcasestr which is O(n).
5734 Implemented by Eric Blake.
5736 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5738 * Implement "e" option for popen to open file descriptor with the
5739 close-on-exec flag set. Implemented by Ulrich Drepper.
5741 * Implement "b" mode for fmemopen. In this mode writes writes don't
5742 implicitly add a NUL byte and seeks from the end of the buffer really
5743 use the buffer end, not the string length as the basis.
5744 Implemented by Ulrich Drepper.
5746 * Many functions, exported and internal, now atomically set the close-on-exec
5747 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5749 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5751 Implemented by Pravin Satpute.
5753 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5757 * The following bugs are resolved with this release:
5759 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5760 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5761 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5762 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5763 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5764 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5765 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5767 * New locales: bo_CN, bo_IN, shs_CA.
5769 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5771 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5772 Implemented by Pravin Satpute.
5774 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5776 * nscd caches now all timeouts for DNS entries
5777 Implemented by Ulrich Drepper.
5779 * nscd is more efficient and wakes up less often.
5780 Implemented by Ulrich Drepper.
5782 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5783 vdprintf, and obstack_vprintf.
5784 Implemented by Jakub Jelinek.
5786 * Faster memset for x86-64.
5787 Implemented by Harsha Jagasia and H.J. Lu.
5789 * Faster memcpy on x86.
5790 Implemented by Ulrich Drepper.
5792 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5793 Implemented by Ulrich Drepper.
5795 * Faster sqrt and sqrtf implemention for some PPC variants.
5796 Implemented by Steven Munroe.
5800 * The following bugs are resolved with this release:
5802 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5803 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5804 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5805 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5806 5071, 5103, 5104, 5112, 5113, 5184, 5186
5808 * More checking functions: fread, fread_unlocked, open*, mq_open.
5809 Implemented by Jakub Jelinek and Ulrich Drepper.
5811 * Extend fortification to C++. Implemented by Jakub Jelinek.
5813 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5814 by not recognizing 'a' as a modifier when those specs are requested.
5815 Implemented by Jakub Jelinek.
5817 * PPC optimizations to math and string functions.
5818 Implemented by Steven Munroe.
5820 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5821 options to be passed. Implemented by Ulrich Drepper.
5823 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5825 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5826 Implemented by Ulrich Drepper.
5828 * Handle private futexes in the NPTL implementation.
5829 Implemented by Jakub Jelinek and Ulrich Drepper.
5831 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5832 Implemented by Roland McGrath and Ulrich Drepper.
5834 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5836 * SHA-256 and SHA-512 based password encryption.
5837 Implemented by Ulrich Drepper.
5839 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5840 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5843 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5844 Implemented by Ulrich Drepper.
5848 * The following bugs are resolved with this release:
5850 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5851 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5852 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5853 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5854 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5855 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5856 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5859 * New Linux interfaces: epoll_pwait, sched_getcpu.
5861 * New generic interfaces: strerror_l.
5863 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5867 * The following bugs are resolved with this release:
5869 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5870 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5871 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5872 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5873 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5874 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5875 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5876 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5877 3225, 3251, 3252, 3253, 3273
5879 * For Linux, the sorting of addresses returned by getaddrinfo now also
5880 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5881 Implemented by Ulrich Drepper.
5883 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5884 Implemented by Ulrich Drepper.
5886 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5888 * New iconv module for MIK. Contributed by Alexander Shopov.
5890 * For sites with broken group and/or passwd database, the auto-propagate
5891 option of nscd can prevent creating ID lookup entries from the results
5892 of a name lookup and vice versa. This usually is no problem but some
5893 site might have problems with the default behavior.
5894 Implemented by Ulrich Drepper.
5896 * Iterating over entire database in NIS can be slow. With the
5897 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5898 to trade time for memory. The entire database will be read at once.
5899 Implemented by Ulrich Drepper.
5901 * The interfaces introduced in RFC 3542 have been implemented by
5904 * Support for the new ELF hash table format was added by Ulrich Drepper.
5906 * Support for priority inheritance mutexes added by Jakub Jelinek and
5909 * Support for priority protected mutexes added by Jakub Jelinek.
5911 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5912 or_IN, csb_PL, fy_NL, sr_ME.
5916 * More overflow detection functions.
5918 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5919 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5921 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5922 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5923 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5924 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5925 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5926 by Masahide Washizawa.
5928 * It is now possible to install audit libraries for the dynamic linker using
5929 LD_AUDIT. Implemented by Ulrich Drepper.
5931 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5932 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5933 For a libc and libpthread that works well on Linux 2.4 kernels, we
5934 recommend using the stable 2.3 branch.
5936 * The new function open_wmemstream acts like open_memstream,
5937 but uses a wchar_t wide character buffer.
5939 * The new function ppoll is an improved version of poll, similar to pselect.
5941 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5942 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5943 renameat, unlinkat, linkat, symlinkat, readlinkat.
5945 * New Linux kernel system calls: unshare,
5946 inotify_init, inotify_add_watch, inotify_rm_watch.
5948 * The euidaccess function is now also known by the alias eaccess,
5949 for compatibility with some other systems.
5951 * Timezone data updated to 2006b version.
5955 * The following bugs are resolved with this release:
5957 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5958 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5959 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5960 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5961 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5962 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5964 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5966 * As of this release, GCC 4 can be used to compile the C Library.
5968 * Timezone data updated to 2005m version.
5972 * The following bugs are resolved with this release:
5974 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5975 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5976 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5977 777, 787, 821, 822, 823, 825
5979 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5983 * Support for RFC 3678. Real implementations exist only for Linux so far.
5984 Implemented by Ulrich Drepper.
5986 * nscd can now cache entries persistently. Expiring entries are reloaded.
5987 For speedups the cache can be shared in memory with client processes.
5988 Implemented by Ulrich Drepper.
5990 * nscd can now perform SELinux checks.
5991 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5993 * getaddrinfo queries are now cached. Canonical name lookup is performed
5995 Implemented by Ulrich Drepper.
5997 * The nothrow function attribute is used when headers are used by gcc when
5998 compiling C code. This can avoid significant amounts of exception
6001 * The malloc functions perform more error checking and are stricter when
6002 it comes to reacting on errors. The default action is to terminate
6003 the process after showing an error message. Implemented by Ulrich Drepper.
6005 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
6006 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
6008 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6009 namespaces using the new function dlmopen(). This feature is of course,
6010 like most other dynamic loading functionality, not available in statically
6011 linked applications. Implemented by Ulrich Drepper.
6013 * Low-overhead boundary checking variants of string and some stdio functions
6014 were added. These are to be used in conjunction with a gcc patch by
6015 Jakub Jelinek which adds calls to these functions if possible.
6016 Implemented by Jakub Jelinek and Ulrich Drepper.
6018 * Old code for several operating systems and machine architectures that
6019 have not been in working condition in a long time have been removed from
6020 the main source tree maintained by the GNU C Library's maintainers.
6021 These files are now reside in the separate `ports' source module
6022 that is usable as an add-on when building the library.
6026 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6027 interrogate the dynamic linker, compatible with the Solaris interface.
6029 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6030 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6032 * getifaddrs now uses the netlink interface on Linux to get its information.
6033 Implemented by Thorsten Kukuk.
6035 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6036 Implemented by Ulrich Drepper.
6038 * support for non-executable stacks on x86 has been added. Changes mostly
6041 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6044 * getaddrinfo now performs destination address selection according to
6049 * Thread-safe interfaces for many functions that access locale data
6050 were added in version 2.3, but these features were omitted from NEWS.
6051 Many functions have variants with an `_l' suffix that take a `locale_t'
6052 object as a parameter rather than consulting the current locale.
6053 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6054 create and maintain `locale_t' objects. Additionally, the new function
6055 `uselocale' sets "the current locale" (as used by functions not so
6056 parameterized) set for an individual thread. These features were added
6057 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6059 * The functions getresuid, getresgid, setresuid, and setresgid, which
6060 have long been available on Linux, are now declared in <unistd.h>
6061 and are now also available on the Hurd.
6063 * ELF thread-local storage support (TLS) now works on x86-64.
6065 * The new dynamic string token $LIB is expanded in shared library names.
6066 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6068 * Aldy Hernandez contributed complete software floating point support for
6069 PowerPC machines with no FPU.
6071 * fexecve is implemented on Linux.
6073 * The `btowc' function should work at least twice as fast due to
6074 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6076 * With approriate thread add-ons cancelable functions are now implemented
6077 in libc.so as well. No need to call the function in libpthread. This
6078 change allowed to finally disable the incorrect and expensive handling
6079 of weak definition in ld.so.
6081 * Yet more PLT entries in libc.so have been removed. We finally arrived
6082 at the bare minimum. Startup times improved appropriately.
6084 * Support for the new Linux/x86 system call interface was added. The
6085 AT_SYSINFO auxiliary vector entry is recognized and handled.
6089 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6092 * iconv (the program and the interface) now accepts empty names (excluding
6093 options like //TRANSLIT) to mean "use charset of current locale".
6095 * localedef can now transliterate characters in strings which are not in
6096 the provided charmap. The information from the input locale is used.
6098 * Prelinking support was added for ELF targets. This requires additional
6099 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6101 * Read-only stdio streams now use mmap to speed up operation by eliminating
6102 copying and buffer underflows. To use add 'm' to the mode string of
6103 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6105 * The malloc functions were completely rewritten by Wolfram Gloger based
6106 on Doug Lea's malloc-2.7.0.c.
6108 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6109 implementation of regex.
6111 * Bruno Haible upgraded the iconv and locale implementation to support
6114 * Contents of the LC_* and LANG environment variables in the CEN style are
6115 not recognized anymore. It never was used. Change by Ulrich Drepper.
6117 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6118 thread-local storage (TLS) ABI on some platforms.
6119 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6121 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6122 EUC-JISX0213, and TSCII.
6124 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6125 BSD-compatible interface for getting all network interface addresses.
6126 Implementation for IPv4 by Roland McGrath.
6128 * Loading of locale data is faster due to the introduction of a locale
6129 archive. Implemented by Roland McGrath and Ulrich Drepper.
6131 * Startup times are significantly reduced by not using exported functions
6132 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6135 * Steven Munroe contributed a port to PowerPC64/Linux.
6139 * The Hurd now uses the GNU libio implementation of stdio rather than the
6140 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6142 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6143 with the same behavior as the Linux system call of the same name.
6147 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6148 128-bit long double format.
6150 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6151 IBM1161, and IBM1162 charsets.
6153 * Andreas Jaeger contributed a port to x86-64/Linux.
6155 * Peter Bruin contributed a port to PowerPC/Hurd.
6157 * libc functions using I/O streams now can handle wide-oriented streams
6160 * optimizations in the dynamic linker. Binaries created by recent binutils
6161 versions start up quicker due to reduced time spent on relocations.
6163 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6167 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6168 asinh, atanh, j0 for the 128-bit long double format.
6170 * Bruno Haible updated all the code handling Unicode in some form to
6171 support Unicode 3.1.
6173 * Speed of regex for single-byte locales is back to previous levels.
6174 Patch by Isamu Hasegawa.
6176 * Alpha, SPARC, and IA-64 now also using floating stacks.
6178 * Startup time of internationalized applications greatly improved through
6179 iconv cache. Use iconvconfig to generate the cache file.
6180 Contributed by Ulrich Drepper.
6182 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6183 severe performance problems. Patch by David Mosberger.
6185 * The Hurd port got a lot more functionality like AIO, various stdio
6186 extensions, etc. Mainly done by Roland McGrath.
6188 * mtrace can now lookup symbols in shared libraries.
6192 * Intel's IA-64 math library is largely integrated. It provides fast and
6193 accurate implementatations for most basic and standard math functions
6194 in float, double, and long double format.
6196 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6197 and asin for the 96-bit long double format and asin, log, tan for the
6198 128-bit long double format.
6200 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6201 The basic double functions exist today. Contributed by Abraham Ziv
6202 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6203 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6205 * An asynchronous name lookup library was added. The interface is designed
6206 after POSIX AIO. The proposal was circulated beforehand to get comments.
6207 No negative ones came in. Implemented by Ulrich Drepper.
6209 * Port to S390/64bit contributed by Martin Schwidefsky
6210 <schwidefsky@de.ibm.com>.
6212 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6213 of functions for Linux/IA-64.
6215 * The RPC code is now thread safe. Threads can now use the same service
6216 of different services at the same time. Patch by Eric Norum
6217 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6219 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6220 family of functions for Linux/S390.
6222 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6223 of functions for Linux/x86.
6225 * Port to Linux/CRIS contributed by Axis Communications.
6229 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6230 we can now check for namespace violations and missing declarations. The
6231 result is that almost all headers are now Unix-compliant (as defined in
6232 the upcoming XPG6). The negative side is that some programs might need
6233 corrections, too, if they depend on the incorrect form of the headers in
6234 previous versions which defined too many symbols and included too many
6237 * regex now handles multibyte character sets correctly.
6238 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6240 * iconv (the program) does now conform to the upcoming XPG6 and handles
6241 charmaps. Instead of the charset names the path of charmaps can be
6242 provided and the conversion happens based on this data.
6243 Contributed by Ulrich Drepper.
6245 * The locale program now provides detailed information about the installed
6250 only lists the names of the supported locales
6254 provides details such as country, language, and codeset name.
6255 Contributed by Ulrich Drepper.
6259 * The gencat program now parses the input file according to the charset
6260 selected by the LC_CTYPE category. This is important for stateful
6261 character sets. To make generating catalogs easier there is a way
6262 to overwrite the charset selected by the locale: before the first
6263 message or $ quote line the catalog can contain a line like
6265 $ codeset=ISO-8859-2
6267 to select the charset (ISO-8859-2 in this case).
6269 Implemented by Shinya Hanataka and Ulrich Drepper.
6271 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6272 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6273 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6275 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6276 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6278 * The LANGUAGE environment variable is now ignored unless the locale is
6279 changed from the default "C" locale.
6281 * The usual bug fixes.
6285 * Greg McGary added runtime support for bounds checking using gcc's
6286 new -fbounded-pointers option. ix86 target is complete. PowerPC
6289 * Thorsten Kukuk added secure mode support to nscd.
6291 * The Berkeley db libraries have been removed.
6293 Related, the nss_db module is now in a separate package since it
6294 obviously requires a database library being available.
6296 * Wide character I/O streams implemented by Ulrich Drepper.
6298 * Functions from the extended socket API added by Ulrich Drepper.
6300 * Functions feenableexcept and fedisableexcept to control the
6301 behaviour of individual exceptions have been added by Andreas Jaeger.
6303 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6305 * The resolver code has been updated from bind 8.2.3-T5B which supports
6306 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6309 This change could in some situations effect backward compatibility. Since
6310 now `_res' is a thread-local instead of a global variable, modifying it
6311 in one thread does not have any effect in other threads.
6313 The resolver library was also extended to allow IPv6 as the transport
6314 protocol for the requests. This work was done by Stig Venaas.
6316 * Compatibility code for K&R C compilers has been removed from the
6317 header files. A ISO C compiler is needed to use the library
6318 (conforming to either C89 or C99 standard).
6320 * Complete rewrite of the localedef program to support multibyte character
6321 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6322 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6323 Implemented by Ulrich Drepper.
6325 Bruno Haible significantly improved the generation and use of the data
6326 structures for the wide character tables.
6328 * Plural handling in gettext implemented by Ulrich Drepper.
6330 * The utmp daemon has been removed.
6332 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6334 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6337 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6339 * POSIX barriers implemented by Kaz Kylheku.
6341 * POSIX spawn function family implemented by Ulrich Drepper.
6343 * POSIX spinlocks are now available.
6345 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6347 * the configure option --enable-kernel=X.Y.Z allows to strip out
6348 compatibility for kernel versions before X.Y.Z. This is currently only
6349 implemented for Linux.
6351 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6352 field sin6_scope_id. This means that all programs using IPv6 should be
6353 recompiled. Don't expect binary compatibility with previous glibc
6356 * various conversion modules for IBM character sets contributed by
6359 * IA-64 port by Jes Sorensen and HJ Lu.
6373 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6375 * New xdr functions are added; some rpc functions are now 64bit clean.
6377 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6379 * Fixed known incompatibilities with glibc 2.0.
6381 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6383 * Optimized a number of functions (especially the ELF dynamic loader).
6385 * Update timezone data files.
6387 * lots of charmaps corrections
6389 * some new locale definitions and charmaps
6394 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6395 conform to POSIX member type requirements. Symbol versions have been
6396 adjusted as needed within the library, and for direct use by applications,
6397 but there is potential for problems if third-party libraries use
6398 struct timeval as part of their interface. This does not present
6399 a problem for X and other "essential" system libraries.
6401 * An additional locale model to support C++ Standard Library locale
6402 model and probably more was implemented by Ulrich Drepper.
6404 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6407 * Miles Bader provided the `argp' function family to support hierachical
6408 command line argument parsing, layered on top of getopt.
6410 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6412 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6415 * scanf recognizes the %a and %A format for scanning floating point numbers.
6417 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6418 information and interfaces for the available integer types.
6420 * about 130 new math functions were added to implement the ISO C9x math
6423 * the new header <complex.h> contains definitions of the complex math
6424 functions from ISO C 9X.
6426 * the new header <tgmath.h> defines generic macros to use complex or
6427 real valued functions.
6429 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6431 * Andreas Jaeger provided a test suite for the math library.
6433 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6435 * Ulrich Drepper added character set conversion functions (iconv).
6437 * Optimized string functions have been added.
6439 * The localedata addon is now part of glibc.
6441 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6443 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6444 daemon for NSS (nscd).
6446 Missing a better place here are some numbers on improvements. Under
6447 Linux 2.1.125 un-tar-ing the kernel sources takes
6451 using local files 12.19s 6.88s 22.91s
6453 using NIS 13.92s 8.91s 26.34s
6455 using NIS & nscd 10.37s 7.34s 25.30s
6457 using NIS+ 27.57s 30.37s 640.46s
6459 using NIS+ & nscd 10.25s 7.83s 26.51s
6461 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6463 Keep in mind that non-namelookup related operations dominate above times.
6464 It was just a common complain that using NIS+ unpacking the kernel is
6467 [1] The old nscd implementation is not available anymore since it was
6468 distributed with glibc up to version 2.0.98 and thus is now replaced.
6470 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6472 * Mark Kettenis provided a Hesiod NSS module.
6474 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6475 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6477 * rcmd can now handle netgroups (Dick Streefland).
6479 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6482 * Support for the IPv6 protocol has been added to the socket API, as per the
6483 latest draft standards.
6485 * Support for Linux 2.2 has been added.
6487 * Interface changes relative to the latest 2.0.x release:
6488 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6489 addseverity NEW: Unix98
6490 alphasort64 NEW: LFS
6491 argp_err_exit_status NEW: argp, GNU ext
6492 argp_error NEW: argp, GNU ext
6493 argp_failure NEW: argp, GNU ext
6494 argp_help NEW: argp, GNU ext
6495 argp_parse NEW: argp, GNU ext
6496 argp_program_bug_address NEW: argp, GNU ext
6497 argp_program_version NEW: argp, GNU ext
6498 argp_program_version_hook NEW: argp, GNU ext
6499 argp_state_help NEW: argp, GNU ext
6500 argp_usage NEW: argp, GNU ext
6501 authdes_create NEW: Secure RPC
6502 authdes_getucred NEW: Secure RPC
6503 authdes_pk_create NEW: Secure RPC
6504 backtrace NEW: GNU ext.
6505 backtrace_symbols NEW: GNU ext.
6506 backtrace_symbols_fd NEW: GNU ext.
6508 cacosf NEW: ISO C 9x
6509 cacosh NEW: ISO C 9x
6510 cacoshf NEW: ISO C 9x
6511 cacoshl NEW: ISO C 9x
6512 cacosl NEW: ISO C 9x
6519 casinf NEW: ISO C 9x
6520 casinh NEW: ISO C 9x
6521 casinhf NEW: ISO C 9x
6522 casinhl NEW: ISO C 9x
6523 casinl NEW: ISO C 9x
6525 catanf NEW: ISO C 9x
6526 catanh NEW: ISO C 9x
6527 catanhf NEW: ISO C 9x
6528 catanhl NEW: ISO C 9x
6529 catanl NEW: ISO C 9x
6530 cbc_crypt NEW: Secure RPC
6534 ccoshf NEW: ISO C 9x
6535 ccoshl NEW: ISO C 9x
6541 cimagf NEW: ISO C 9x
6542 cimagl NEW: ISO C 9x
6543 clearerr_locked REMOVED
6544 clntunix_create NEW: sunrpc ext
6546 clog10 NEW: ISO C 9x
6547 clog10f NEW: ISO C 9x
6548 clog10l NEW: ISO C 9x
6558 cprojf NEW: ISO C 9x
6559 cprojl NEW: ISO C 9x
6561 crealf NEW: ISO C 9x
6562 creall NEW: ISO C 9x
6567 csinhf NEW: ISO C 9x
6568 csinhl NEW: ISO C 9x
6571 csqrtf NEW: ISO C 9x
6572 csqrtl NEW: ISO C 9x
6576 ctanhf NEW: ISO C 9x
6577 ctanhl NEW: ISO C 9x
6579 des_setparity NEW: Secure RPC
6580 ecb_crypt NEW: Secure RPC
6581 endutxent NEW: Unix98
6583 exp10f NEW: ISO C 9x
6584 exp10l NEW: ISO C 9x
6588 fattach NEW: STREAMS
6589 fdetach NEW: STREAMS
6593 feclearexcept NEW: ISO C 9x
6594 fegetenv NEW: ISO C 9x
6595 fegetexceptflag NEW: ISO C 9x
6596 fegetround NEW: ISO C 9x
6597 feholdexcept NEW: ISO C 9x
6599 feraiseexcept NEW: ISO C 9x
6600 ferror_locked REMOVED
6601 fesetenv NEW: ISO C 9x
6602 fesetexceptflag NEW: ISO C 9x
6603 fesetround NEW: ISO C 9x
6604 fetestexcept NEW: ISO C 9x
6605 feupdateenv NEW: ISO C 9x
6606 fflush_locked REMOVED
6610 fgets_unlocked NEW: GNU ext.
6611 fileno_locked REMOVED
6623 fputc_locked REMOVED
6624 fputs_unlocked NEW: GNU ext.
6625 fread_unlocked NEW: GNU ext.
6630 fstatvfs NEW: Unix98
6634 ftruncate64 NEW: LFS
6636 fwrite_unlocked NEW: GNU ext.
6637 gai_strerror NEW: IPv6
6641 getchar_locked REMOVED
6643 getdate_err NEW: Unix98
6644 getdate_r NEW: GNU ext.
6646 getnameinfo NEW: IPv6
6647 getnetname NEW: Secure RPC
6648 getpmsg NEW: STREAMS
6649 getpt NEW: Unix98 PTY
6650 getrlimit64 NEW: LFS
6651 getutxent NEW: Unix98
6652 getutxid NEW: Unix98
6653 getutxline NEW: Unix98
6654 glob64 NEW: GNU ext.
6655 globfree64 NEW: GNU ext.
6656 gnu_get_libc_release NEW: GNU ext.
6657 gnu_get_libc_version NEW: GNU ext.
6658 grantpt NEW: Unix98 PTY
6659 host2netname NEW: Secure RPC
6661 iconv_close NEW: iconv
6662 iconv_open NEW: iconv
6663 if_freenameindex NEW: IPv6
6664 if_indextoname NEW: IPv6
6665 if_nameindex NEW: IPv6
6666 if_nametoindex NEW: IPv6
6667 in6addr_any NEW: IPv6
6668 in6addr_loopback NEW: IPv6
6669 inet6_isipv4mapped NEW: IPv6
6670 isastream NEW: STREAMS
6671 iswblank NEW: GNU ext.
6672 key_decryptsession NEW: Secure RPC
6673 key_decryptsession_pk NEW: Secure RPC
6674 key_encryptsession NEW: Secure RPC
6675 key_encryptsession_pk NEW: Secure RPC
6676 key_gendes NEW: Secure RPC
6677 key_get_conv NEW: Secure RPC
6678 key_secretkey_is_set NEW: Secure RPC
6679 key_setnet NEW: Secure RPC
6680 key_setsecret NEW: Secure RPC
6681 llrint NEW: ISO C 9x
6682 llrintf NEW: ISO C 9x
6683 llrintl NEW: ISO C 9x
6684 llround NEW: ISO C 9x
6685 llroundf NEW: ISO C 9x
6686 llroundl NEW: ISO C 9x
6691 lrintf NEW: ISO C 9x
6692 lrintl NEW: ISO C 9x
6693 lround NEW: ISO C 9x
6694 lroundf NEW: ISO C 9x
6695 lroundl NEW: ISO C 9x
6697 makecontext NEW: Unix98
6698 mempcpy NEW: GNU ext.
6701 modify_ldt NEW: kernel
6705 nearbyint NEW: ISO C 9x
6706 nearbyintf NEW: ISO C 9x
6707 nearbyintl NEW: ISO C 9x
6708 netname2host NEW: Secure RPC
6709 netname2user NEW: Secure RPC
6710 nexttoward NEW: ISO C 9x
6711 nexttowardf NEW: ISO C 9x
6712 nexttowardl NEW: ISO C 9x
6716 passwd2des NEW: Secure RPC
6718 pow10f NEW: GNU ext.
6719 pow10l NEW: GNU ext.
6722 printf_size NEW: GNU ext.
6723 printf_size_info NEW: GNU ext.
6724 profil_counter REMOVED
6725 pthread_mutexattr_getkind_np REPLACED
6726 pthread_mutexattr_setkind_np REPLACED
6727 ptsname NEW: Unix98 PTY
6728 ptsname_r NEW: Unix98 PTY
6730 putchar_locked REMOVED
6731 putgrent NEW: GNU ext.
6733 putpmsg NEW: STREAMS
6734 pututxline NEW: Unix98
6738 readdir64_r NEW: LFS
6739 remquo NEW: ISO C 9x
6740 remquof NEW: ISO C 9x
6741 remquol NEW: ISO C 9x
6743 roundf NEW: ISO C 9x
6744 roundl NEW: ISO C 9x
6746 scalbln NEW: ISO C 9x
6747 scalblnf NEW: ISO C 9x
6748 scalblnl NEW: ISO C 9x
6750 sendfile NEW: kernel
6751 setcontext NEW: Unix98
6752 setrlimit64 NEW: LFS
6753 setutxent NEW: Unix98
6755 sigignore NEW: Unix98
6756 sigqueue NEW: POSIX.1b
6757 sigrelse NEW: Unix98
6758 sigset NEW: POSIX.1b
6759 sigtimedwait NEW: POSIX.1b
6760 sigwaitinfo NEW: POSIX.1b
6761 sincos NEW: GNU ext.
6762 sincosf NEW: GNU ext.
6763 sincosl NEW: GNU ext.
6767 strcasestr NEW: GNU ext.
6768 strtoimax NEW: ISO C 9x
6769 strtoumax NEW: ISO C 9x
6770 strverscmp NEW: GNU ext.
6771 svcauthdes_stats NEW: Secure RPC
6772 svcunix_create NEW: sunrpc etx
6773 svcunixfd_create NEW: sunrpc ext
6774 swapcontext NEW: Unix98
6775 tcgetsid NEW: Unix98 PTY
6776 tdestroy NEW: GNU ext.
6777 tgamma NEW: ISO C 9x
6778 tgammaf NEW: ISO C 9x
6779 tgammal NEW: ISO C 9x
6783 truncf NEW: ISO C 9x
6784 truncl NEW: ISO C 9x
6786 unlockpt NEW: Unix98 PTY
6787 updwtmpx NEW: Unix98
6788 user2netname NEW: Secure RPC
6789 utmpxname NEW: Unix98
6790 versionsort NEW: GNU ext.
6791 versionsort64 NEW: GNU ext.
6793 wcscasecmp NEW: GNU ext.
6794 wcsncasecmp NEW: GNU ext.
6795 wcsnlen NEW: GNU ext.
6796 wcstoimax NEW: ISO C 9x
6797 wcstoll NEW: ISO C 9x
6798 wcstoull NEW: ISO C 9x
6799 wcstoumax NEW: ISO C 9x
6801 wordexp NEW: POSIX.2
6802 wordfree NEW: POSIX.2
6803 write_profiling REMOVED
6804 xdecrypt NEW: Secure RPC
6805 xdr_authdes_cred NEW: Secure RPC
6806 xdr_authdes_verf NEW: Secure RPC
6807 xdr_cryptkeyarg NEW: Secure RPC
6808 xdr_cryptkeyarg2 NEW: Secure RPC
6809 xdr_cryptkeyres NEW: Secure RPC
6810 xdr_getcredres NEW: Secure RPC
6811 xdr_key_netstarg NEW: Secure RPC
6812 xdr_key_netstres NEW: Secure RPC
6813 xdr_keybuf NEW: Secure RPC
6814 xdr_keystatus NEW: Secure RPC
6815 xdr_netnamestr NEW: Secure RPC
6816 xdr_sizeof NEW: Secure RPC
6817 xdr_unixcred NEW: sunrpc ext
6818 xencrypt NEW: Secure RPC
6819 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6830 * inet_ntoa is thread-safe
6832 * updwtmp is moved from libutil to libc
6834 * rewrite of cbrt function
6836 * update of timezone data
6850 * add atoll function
6852 * fix complex problems in Berkeley DB code
6854 * fix math functions
6858 * fixed lots of header problems (especially Linux/GNU specific)
6860 * dynamic loader preserves all registers
6862 * Roland McGrath provided support for handling of auxiliary objects in
6863 the ELF dynamic loader.
6865 * support for parallel builds is improved
6869 * GNU extensions are no longer declared by default. To enable them you
6870 must define the macro `_GNU_SOURCE' in your program or compile with
6873 * The library has changed from using GNU ld symbol aliases to using weak
6874 symbols where available. The ELF object file format supports weak
6875 symbols; GNU ld also supports weak symbols in the a.out format. (There
6876 is also now support for other GNU ld extensions in ELF. Use the
6877 `--with-elf' option to configure to indicate you have ELF, and
6878 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6879 of many files which contained only symbol aliases, reducing the size of
6880 the source and the compiled library; many other files were renamed to
6881 less cryptic names previously occupied by the symbol alias files.
6882 There is a new header file <elf.h> for programs which operate on
6883 files in the ELF format.
6885 * Converted to Autoconf version 2, so `configure' has more options.
6886 Run `configure --help' to see the details.
6888 * The library can now be configured to build profiling, highly-optimized
6889 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6890 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6891 `configure' enable building these extra libraries. The shared library is
6892 built by default when using both ELF and GNU ld. When shared libraries
6893 are enabled, the new library `-ldl' is available for arbitrary run-time
6894 loading of shared objects; its interface is defined in <dlfcn.h>. The
6895 new header file <link.h> gives access to the internals of the run-time
6896 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6897 application of same name on other systems and it provides information
6898 about dynamically linked binaries.
6900 * The C library now provides the run-time support code for profiling
6901 executables compiled with `-pg'. Programs can control the profiling code
6902 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6903 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6904 the support for this file format was contributed by David Mosberger-Tang.
6906 * The math code has been replaced with a math library based on fdlibm from
6907 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6908 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6909 functions. The math functions now reside in a separate library, so
6910 programs using them will need to use `-lm' their linking commands.
6912 * John C. Bowman contributed optimized ix87 assembler inline functions.
6914 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6915 mechanism similar to that found in Solaris 2. This is now used for the
6916 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6917 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6918 file controls what services are used for each individual database. This
6919 works by loading shared libraries with names specified in `nsswitch.conf',
6920 so service modules can be changed or added at any time without even
6921 relinking any program. Currently there are the file, db, and NIS based
6922 NSS services available.
6924 * The new functions `strtoq' and `strtouq' parse integer values from
6925 strings, like `strtol' and `strtoul', but they return `long long int' and
6926 `unsigned long long int' values, respectively (64-bit quantities).
6928 * The new functions `strtof' and `strtold' parse floating-point values from
6929 strings, like `strtod', but they return `float' and `long double' values,
6930 respectively (on some machines `double' and `long double' are the same).
6932 * Ulrich Drepper has contributed new implementations of the floating-point
6933 printing and reading code used in the `printf' family of functions and
6934 `strtod', `strtof', and `strtold'. These new functions are perfectly
6935 accurate, and much faster than the old ones.
6937 * The implementation of the POSIX locale model was completely rewritten by
6938 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6939 to compile the POSIX locale definition.
6941 * The former dummy implementations of the strcoll and strxfrm function are
6942 now replaced by fully functional code contributed by Ulrich Drepper. The
6943 collation information comes from the POSIX locale definitions.
6945 * The new header <langinfo.h> defines an interface for accessing
6946 various locale-dependent data (using the locale chosen with `setlocale').
6948 * Ulrich Drepper has contributed a new suite of functions for operation on
6949 wide-character and multibyte-character strings, in <wchar.h>;
6950 and classification and case conversion of wide characters, in <wctype.h>.
6951 These new functions are conforming to the ISO C, Amendement 1 specification.
6953 * There is now a second implementation of the standard I/O library available.
6954 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6955 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6957 * You can now use positional parameter specifications in format strings
6958 for the `printf' and `scanf' families of functions. For example,
6959 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6960 ``Number 6, Mr Jones''. This is mainly useful when providing different
6961 format strings for different languages, whose grammars may dictate
6962 different orderings of the values being printed. To support this
6963 feature, the interface for `register_printf_handler' has changed; see
6964 the header file <printf.h> for details.
6966 * The `printf' and `scanf' families of functions now understand a new
6967 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6968 to group numbers as indicated by the locale; for `scanf' and friends, this
6969 says to accept as valid only a number with all the proper grouping
6970 separators in the right places. In the default "C" locale, numbers are
6971 not grouped; but locales for specific countries will define the usual
6972 conventions (i.e. separate thousands with `,' in the US locale).
6974 * The pgrp functions have been regularized, slightly incompatibly but much
6975 less confusingly. The core functions are now `getpgid' and `setpgid',
6976 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6977 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6978 provided for compatibility. There is no longer an incompatible `getpgrp'
6979 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6981 * The new header file <fts.h> and suite of functions simplify programs that
6982 operate on directory trees. This code comes from 4.4 BSD.
6984 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6985 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6986 NSS scheme used in glibc.
6988 * There is a new malloc debugging hook `__memalign_hook'.
6990 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6991 `unsigned int' in <sys/types.h>. These are for compatibility only and
6992 their use is discouraged.
6994 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6995 done differently, so that it works even without GNU ld.
6997 * New function `euidaccess' checks allowed access to a file like `access',
6998 but using the effective IDs instead of the real IDs.
7000 * The time zone data files have been updated for the latest and greatest
7001 local time conventions of the countries of the world.
7003 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
7006 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
7007 for formatting floating-point numbers. They are provided only for
7008 compatibility; new programs should use `sprintf' instead. There are
7009 also equivalent function for the `long double' floating-point type and
7010 all functions also exist in a reentrant form.
7012 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7013 functions for maintaining the login-record files (primarily of use to
7014 system programs such as `login'), and convenient functions for
7015 allocating and initializing a pseudo-terminal (pty) device.
7017 * Ulrich Drepper has contributed new support for System V style
7018 shared memory and IPC on systems that support it.
7020 * Ulrich Drepper has contributed several miscellaneous new functions found
7021 in System V: The `hsearch' family of functions provide an effective
7022 implementation of hash tables; `a64l' and `l64a' provide a very simple
7023 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7026 * Ulrich Drepper has contributed new reentrant counterparts for the
7027 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7029 * Ulrich Drepper has contributed new, highly-optimized versions of several
7030 string functions for the i486/Pentium family of processors.
7032 * Ulrich Drepper has updated the Linux-specific code, based largely
7033 on work done in Hongjiu Lu's version of GNU libc for Linux.
7034 The GNU library now supports Linux versions 2.0.10 and later,
7035 using the ELF object file format (i[3456]86-*-linux).
7037 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7039 * David Mosberger-Tang and Richard Henderson have ported the C library
7040 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7041 dynamic linking support for ELF/Alpha.
7043 * Richard Henderson contributed several Alpha optimized assembler function
7044 for arithmetic and string handling.
7046 * Ulrich Drepper has contributed a new set of message catalog functions to
7047 support multiple languages using the <libintl.h> interface, for use with
7048 his new package GNU gettext. Translation volunteers have contributed
7049 catalogs of the library's messages in Spanish, German, and Korean.
7051 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7052 program and the `catgets' function for reading the catalog files it
7053 creates. (The <libintl.h> interface is preferred; we include the
7054 <nl_types.h> interface using `catgets' only for source compatibility with
7055 programs already written to use it.)
7057 * New header file <values.h> gives SVID-compatible names for <limits.h>
7060 * Various new macros, declarations, and small header files for compatibility
7063 * New function `group_member' is a convenient way to check if a process has
7064 a given effective group ID.
7066 * When using GCC 2.7 and later, the socket functions are now declared in a
7067 special way so that passing an argument of type `struct sockaddr_in *',
7068 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7069 `struct sockaddr *' type, does not generate a type-clash warning.
7071 * New function `error' declared in header file <error.h> is a convenient
7072 function for printing error messages and optionally exiting; this is the
7073 canonical function used in GNU programs. The new functions `err', `warn',
7074 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7075 doing the same thing.
7077 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7078 POSIX.2 `glob' function to do ~ and {...} expansion.
7080 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7081 `clearenv' which is used in POSIX.9 is also available.
7083 * New function `getsid' returns session ID number on systems that support it.
7085 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7086 files <db.h> and <mpool.h> provide a rich set of functions for several
7087 types of simple databases stored in memory and in files, and <ndbm.h> is
7088 an old `ndbm'-compatible interface using the `db' functions. Link with
7089 `-ldb' to get these functions.
7091 * New macro `strdupa' copies a string like `strdup', but uses local stack
7092 space from `alloca' instead of dynamic heap space from `malloc'.
7094 * New function `strnlen' is like `strlen' but searches only a given maximum
7095 number of characters for the null terminator. `stpncpy', `strndup' and
7096 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7099 * New function `statfs' in header <sys/statfs.h>.
7101 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7102 provide convenient functions for operating on blocks of null-terminated
7105 * A new suite of functions in <utmp.h> handle all the details of reading
7106 and writing the utmp file.
7108 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7111 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7112 completely POSIX compliant and also implemented the extended functionality
7113 to handle alternate digit representation and alternate era date formats.
7115 * Ulrich Drepper provided an implementation of the `strptime' function
7116 defined in XPG4.2 which transforms a string into a `struct tm' value.
7118 * Paul Eggert provided the tzselect shell script as part of the timezone
7119 code. The shell script makes it easy to select the correct timezone
7122 * The implementation of the malloc family of functions is completely replaced
7123 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7124 The implementation uses the mmap function (if available) and it is
7125 optimized for the use in multi threaded programs.
7127 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7128 functions. This new functionality is usable by specifying a special
7129 salt string and it is compatible with implementation on *BSD systems.
7131 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7132 `getsubopt' to handle second level command line options, `bsd_signal'
7133 to access BSD style `signal' functionality, the obsolete `regexp' style
7136 * the `lchown' function is available on system which support this
7139 * The implementation of the shadow password handling function was contributed
7142 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7144 * POSIX.1g support was added. The <sys/select.h> header is available,
7145 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7146 implementation of `getaddrinfo'.
7150 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7152 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7153 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7155 * The new function `daemon' from 4.4 BSD is useful for server programs that
7156 want to put themselves in the background.
7158 * Joel Sherrill has contributed support for several standalone boards that
7159 run without an operating system.
7161 * `printf', `scanf' and friends now accept a `q' type modifier for long
7162 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7164 * All of the code taken from BSD (notably most of the math and networking
7165 routines) has been updated from the BSD 4.4-Lite release.
7167 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7169 * The new functions `getdomainname' and `setdomainname' fetch or change the
7170 YP/NIS domain name. These are system calls which exist on systems which
7173 * The time zone data files have been updated for the latest international
7176 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7177 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7181 * The C library now includes support for Sun RPC, from Sun's free
7182 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7183 are included. (There is still no support for YP.)
7185 * Tom Quinn has contributed a port of the C library to SGI machines running
7186 Irix 4 (mips-sgi-irix4).
7188 * The new `lockf' function is a simplified interface to the locking
7189 facilities of `fcntl', included for compatibility.
7191 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7193 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7195 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7198 * The error message printed by `assert' for a failed assertion now includes
7199 the name of the program (if using GNU ld) and the name of the calling
7200 function (with versions of GCC that support this).
7202 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7204 * The library now includes the <sys/mman.h> header file and memory
7205 management functions `mmap', `munmap', `mprotect', `msync', and
7206 `madvise', on systems that support those facilities.
7208 * The interface for `mcheck' has changed slightly: the function called to
7209 abort the program when an allocation inconsistency is detected now takes
7210 an argument that indicates the type of failure. The new function
7211 `mprobe' lets you request a consistency check for a particular block at
7212 any time (checks are normally done only when you call `free' or `realloc'
7215 * It is now possible to easily cross-compile the C library, building on one
7216 system a library to run on another machine and/or operating system. All
7217 you need to do is set the variable `HOST_CC' in `configparms' to the
7218 native compiler for programs to run on the machine you are building on (a
7219 few generator programs are used on Unix systems); set `CC' to the
7222 * The new function `fexecve' (only implemented on the GNU system) executes
7223 a program file given a file descriptor already open on the file.
7227 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7228 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7230 * You can set the variable `libprefix' in `configparms' to specify a prefix
7231 to be prepended to installed library files; this makes it easy to install
7232 the GNU C library to be linked as `-lgnuc' or whatever.
7234 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7235 copies a limited number of characters from a string, and returns the
7236 address of the last character written.
7238 * You no longer need to check for whether the installed `stddef.h' is
7239 compatible with the GNU C library. configure now checks for you.
7241 * You can now define a per-stream `fileno' function to convert the
7242 stream's cookie into an integral file descriptor.
7244 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7245 allocates zero bytes of storage, and returns a unique pointer which
7246 you can pass to `realloc' or `free'. The behavior is undefined if
7247 you dereference this pointer.
7249 * The C library now runs on Sony NEWS m68k machines running either
7250 NewsOS 3 or NewsOS 4.
7252 * The new `syscall' function is a system-dependent primitive function
7253 for invoking system calls. It has the canonical behavior on Unix
7254 systems, including unreliable return values for some calls (such as
7255 `pipe', `fork' and `getppid').
7257 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7258 to `EAGAIN', which is the preferred name. On systems whose kernels
7259 use two distinct codes, the C library now translates EWOULDBLOCK to
7260 EAGAIN in every system call function.
7264 * The GNU C Library Reference Manual is now distributed with the library.
7265 `make dvi' will produce a DVI file of the printed manual.
7266 `make info' will produce Info files that you can read on line using C-h i
7267 in Emacs or the `info' program.
7268 Please send comments on the manual to bug-glibc-manual@gnu.org.
7270 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7272 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7274 * Jason Merrill has contributed a port to the Sequent Symmetry running
7275 Dynix version 3 (i386-sequent-dynix).
7277 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7278 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7280 * New function `memory_warnings' lets you arrange to get warnings when
7281 malloc is running out of memory to allocate, like Emacs gives you.
7283 * The C library now contains the relocating allocator used in Emacs 19 for
7284 its editing buffers. This allocator (ralloc) minimizes allocation
7285 overhead and fragmentation by moving allocated regions around whenever it
7286 needs to. You always refer to a ralloc'd region with a "handle" (a
7287 pointer to a pointer--an object of type `void **').
7289 * There is a new `printf' format: `%m' gives you the string corresponding
7290 to the error code in `errno'.
7292 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7293 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7294 pass, the `a' modifier says to fill in a `char **' you pass with a
7297 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7298 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7299 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7301 * `mkstemp' is a traditional Unix function to atomically create and open a
7302 uniquely-named temporary file.
7306 * The standard location for the file that says what the local timezone is
7307 has changed again. It is now `/usr/local/etc/localtime' (or more
7308 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7310 * The distribution no longer contains any files with names longer than 14
7313 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7314 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7316 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7320 * The configuration process has changed quite a bit. The `configure'
7321 script is now used just like the configuration scripts for other GNU
7322 packages. The `sysdeps' directory hierarchy is much rearranged.
7323 The file `INSTALL' explains the new scheme in detail.
7325 * The header files no longer need to be processed into ANSI C and
7326 traditional C versions. There is just one set of files to install, and
7327 it will work with ANSI or old C compilers (including `gcc -traditional').
7329 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7330 MIPS DECStation running Ultrix 4.
7332 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7333 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7334 made itself into a shared library.
7336 * Yet further improved support for the i386, running 4.3 BSD-like systems
7337 (such as Mach 3 with the Unix single-server), or System V.
7339 * New function `strncasecmp' to do case-insensitive string comparison
7340 with limited length.
7342 * New function `strsep' is a reentrant alternative to `strtok'.
7344 * New functions `scandir' and `alphasort' for searching directories.
7346 * New function `setenv' is a better interface to `putenv'.
7348 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7349 function for traversing a directory tree.
7351 * The GNU obstack package is now also part of the C library.
7352 The new function `open_obstack_stream' creates a stdio stream that
7353 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7354 formatted output directly to an obstack.
7356 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7357 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7359 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7361 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7362 things to your strings.
7364 * There are some new test programs: test-fseek, testmb, and testrand.
7366 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7367 These ports are not finished, but are a good starting place for really
7368 supporting those systems.
7370 * `/etc/localtime' is now the standard location for the file that says what
7371 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7372 This follows the general principle that `/etc' is the place for all local
7373 configuration files.
7375 * The C library header files now use `extern "C"' when used by the C++
7376 compiler, so the C library should now work with C++ code.
7378 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7379 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7382 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7383 function which uses the `merge sort' algorithm, and is said to be
7384 significantly faster than the old GNU `qsort' function. Merge sort is
7385 now the standard `qsort' function. The new algorithm can require a lot
7386 of temporary storage; so, the old sorting function is called when the
7387 required storage is not available.
7389 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7390 provides the Unix `crypt' function, plus some other entry points.
7392 * The code and header files taken from 4.4 BSD have been updated with the
7393 latest files released from Berkeley.
7395 ----------------------------------------------------------------------
7398 Permission is granted to anyone to make or distribute verbatim copies
7399 of this document as received, in any medium, provided that the
7400 copyright notice and this permission notice are preserved,
7401 thus giving the recipient permission to redistribute in turn.
7403 Permission is granted to distribute modified versions
7404 of this document, or of portions of it,
7405 under the above conditions, provided also that they
7406 carry prominent notices stating who last changed them.
7409 version-control: never