1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2020 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 * Unicode 12.1.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 12.1.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
18 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
19 DT_DEPAUDIT dynamic section entries of the main executable.
21 * powerpc64le supports IEEE128 long double libm/libc redirects when
22 using the -mabi=ieeelongdouble to compile C code on supported GCC
23 toolchains. It is recommended to use GCC 8 or newer when testing
26 * To help detect buffer overflows and other out-of-bounds accesses
27 several APIs have been annotated with GCC 'access' attribute. This
28 should help GCC 10 issue better warnings.
30 * On Linux, functions the pthread_attr_setsigmask_np and
31 pthread_attr_getsigmask_np have been added. They allow applications
32 to specify the signal mask of a thread created with pthread_create.
34 * Support for automatically registering threads with the Linux rseq
35 system call has been added. This system call is implemented starting
36 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
37 operations on per-cpu data. It allows user-space to perform updates
38 on per-cpu data without requiring heavy-weight atomic operations.
39 Automatically registering threads allows all libraries, including libc,
40 to make immediate use of the rseq support by using the documented ABI.
41 The GNU C Library manual has details on integration of Restartable
44 * The GNU C Library now provides the header file <sys/single_threaded.h>
45 which declares the variable __libc_single_threaded. Applications are
46 encouraged to use this variable for single-thread optimizations,
47 instead of weak references to symbols historically defined in
50 * The functions sigabbrev_np and sigdescr_np have been added. The
51 sigabbrev_np returns the abbreviated signal name (e.g. "HUP" for SIGHUP)
52 while sigdescr_np returns a string describing the signal number (e.g
53 "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
54 attempt to translate the return description, both functions return
55 NULL for an invalid signal number.
57 They should be used instead of sys_siglist or sys_sigabbrev and they
58 are both thread and async-signal safe. These functions are GNU extensions.
60 * The functions strerrorname_np and strerrordesc_np have been added. The
61 strerroname_np returns error number name (e.g. "EINVAL" for EINVAL) while
62 strerrordesc_np returns string describing error number
63 (e.g "Invalid argument" for EINVAL). Different than strerror,
64 strerrordesc_np does not attempt to translate the return description, both
65 functions return NULL for an invalid error number.
67 They should be used instead of sys_errlist and sys_nerr, both are
68 thread and async-signal safe. These functions are GNU extensions.
70 * AArch64 now supports standard branch protection security hardening
71 in glibc when it is built with a GCC that is configured with
72 --enable-standard-branch-protection. This includes branch target
73 identification (BTI) and pointer authentication for return addresses
74 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
75 extensions respectively for the protection to be effective,
76 otherwise the used instructions are nops. User code can use PAC-RET
77 without libc support, but BTI requires a libc that is built with BTI
78 support, otherwise runtime objects linked into user code will not be
81 Deprecated and removed features, and other changes affecting compatibility:
83 * The deprecated <sys/sysctl.h> header and the sysctl function have been
84 removed. To support old binaries, the sysctl function continues to
85 exist as a compatibility symbol (on those architectures which had it),
86 but always fails with ENOSYS. This reflects the removal of the system
87 call from all architectures, starting with Linux 5.5.
89 * The sstk function is no longer available to newly linked binaries.
90 Its implementation always returned with a failure, and the function
91 was not declared in any header file.
93 * The legacy signal handling functions siginterrupt, sigpause, sighold,
94 sigrelse, sigignore and sigset, and the sigmask macro have been
95 deprecated. Applications should use the sigsuspend, sigprocmask and
96 sigaction functions instead.
98 * ldconfig now defaults to the new format for ld.so.cache. glibc has
99 already supported this format for almost 20 years.
101 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
102 are no longer available to newly linked binaries, and their declarations
103 have been removed from <string.h>. They are exported solely as
104 compatibility symbols to support old binaries. All programs should use
107 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
108 are no longer available to newly linked binaries, and their declarations
109 have been removed from from <stdio.h>. They are exported solely as
110 compatibility symbols to support old binaries. All programs should use
111 strerror or strerror_r instead.
113 * Both strerror and strerror_l now share the same internal buffer in the
114 calling thread, meaning that the returned string pointer may be invalided
115 or contents might be overwritten on subsequent calls in the same thread or
116 if the thread is terminated. It makes strerror MT-safe.
118 * The "files", "nis" and "nisplus" NSS modules no longer supports the
119 "key" database (used for secure RPC). The contents of the
120 /etc/publickey file will be ignored, regardless of the settings in
121 /etc/nsswitch.conf. (This method of storing RPC keys only supported
122 the obsolete and insecure AUTH_DES flavor of secure RPC.)
124 Changes to build and runtime requirements:
126 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
127 long double redirects.
129 Security related changes:
131 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
132 corruption when they were passed a pseudo-zero argument. Reported by Guido
133 Vranken / ForAllSecure Mayhem.
135 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
136 out-of-bounds write when executed in a signal frame context.
138 CVE-2020-1752: A use-after-free vulnerability in the glob function when
139 expanding ~user has been fixed.
141 The following bugs are resolved with this release:
143 [The release manager will add the list generated by
144 scripts/list-fixed-bugs.py just before the release.]
150 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
151 enable features from the draft ISO C2X standard. Only some features from
152 this draft standard are supported by the GNU C Library, and as the draft
153 is under active development, the set of features enabled by this macro is
154 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
155 by compiling with "gcc -std=gnu2x".
157 * The <math.h> functions that round their results to a narrower type now
158 have corresponding type-generic macros in <tgmath.h>, as defined in TS
159 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
160 Clarification Request 13 to TS 18661-3.
162 * The function pthread_clockjoin_np has been added, enabling join with a
163 terminated thread with a specific clock. It allows waiting against
164 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
166 * New locale added: mnw_MM (Mon language spoken in Myanmar).
168 * The DNS stub resolver will optionally send the AD (authenticated data) bit
169 in queries if the trust-ad option is set via the options directive in
170 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
171 mode, the AD bit, as provided by the name server, is available to
172 applications which call res_search and related functions. In the default
173 mode, the AD bit is not set in queries, and it is automatically cleared in
174 responses, indicating a lack of DNSSEC validation. (Therefore, the name
175 servers and the network path to them are treated as untrusted.)
177 Deprecated and removed features, and other changes affecting compatibility:
179 * The totalorder and totalordermag functions, and the corresponding
180 functions for other floating-point types, now take pointer arguments to
181 avoid signaling NaNs possibly being converted to quiet NaNs in argument
182 passing. This is in accordance with the resolution of Clarification
183 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
184 floating-point arguments directly will continue to work.
186 * The obsolete function stime is no longer available to newly linked
187 binaries, and its declaration has been removed from <time.h>.
188 Programs that set the system time should use clock_settime instead.
190 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
191 in a future version of glibc. In this release, the header still exists
192 but calling ftime will cause a compiler warning. All programs should use
193 gettimeofday or clock_gettime instead.
195 * The gettimeofday function no longer reports information about a
196 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
197 many years, as it cannot handle the full complexity of the world's
198 timezones, but hitherto we have supported it on a best-effort basis.
199 Changes required to support 64-bit time_t on 32-bit architectures have
200 made this no longer practical.
202 As of this release, callers of gettimeofday with a non-null 'tzp' argument
203 should expect to receive a 'struct timezone' whose tz_minuteswest and
204 tz_dsttime fields are zero. (For efficiency reasons, this does not always
205 happen on a few Linux-based ports. This will be corrected in a future
208 All callers should supply a null pointer for the 'tzp' argument to
209 gettimeofday. For accurate information about the time zone associated
210 with the current time, use the localtime function.
212 gettimeofday itself is obsolescent according to POSIX. We have no plans
213 to remove access to this function, but portable programs should consider
214 using clock_gettime instead.
216 * The settimeofday function can still be used to set a system-wide time
217 zone when the operating system supports it. This is because the Linux
218 kernel reused the API, on some architectures, to describe a system-wide
219 time-zone-like offset between the software clock maintained by the kernel,
220 and the "RTC" clock that keeps time when the system is shut down.
222 However, to reduce the odds of this offset being set by accident,
223 settimeofday can no longer be used to set the time and the offset
224 simultaneously. If both of its two arguments are non-null, the call
225 will fail (setting errno to EINVAL).
227 Callers attempting to set this offset should also be prepared for the call
228 to fail and set errno to ENOSYS; this already happens on the Hurd and on
229 some Linux architectures. The Linux kernel maintainers are discussing a
230 more principled replacement for the reused API. After a replacement
231 becomes available, we will change settimeofday to fail with ENOSYS on all
232 platforms when its 'tzp' argument is not a null pointer.
234 settimeofday itself is obsolescent according to POSIX. Programs that set
235 the system time should use clock_settime and/or the adjtime family of
236 functions instead. We may cease to make settimeofday available to newly
237 linked binaries after there is a replacement for Linux's time-zone-like
240 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
241 the optional CAS instruction is implemented (for instance, LEON processors
242 are still supported, but SuperSPARC processors are not).
244 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
247 * If a lazy binding failure happens during dlopen, during the execution of
248 an ELF constructor, the process is now terminated. Previously, the
249 dynamic loader would return NULL from dlopen, with the lazy binding error
250 captured in a dlerror message. In general, this is unsafe because
251 resetting the stack in an arbitrary function call is not possible.
253 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
254 executable stack unless explicitly configured at build time to require
255 minimum kernel version 4.8 or newer. This is because executing
256 floating-point branches on a non-executable stack on Linux kernels prior to
257 4.8 can lead to application crashes for some MIPS configurations. While
258 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
259 expected to enable non-executable stack by default with PT_GNU_STACK by
260 default and is thus likely to trigger a crash on older kernels.
262 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
263 non-executable stack while dropping support for older kernels.
265 * System call wrappers for time system calls now use the new time64 system
266 calls when available. On 32-bit targets, these wrappers attempt to call
267 the new system calls first and fall back to the older 32-bit time system
268 calls if they are not present. This may cause issues in environments
269 that cannot handle unsupported system calls gracefully by returning
270 -ENOSYS. Seccomp sandboxes are affected by this issue.
272 Changes to build and runtime requirements:
274 * It is no longer necessary to have recent Linux kernel headers to build
275 working (non-stub) system call wrappers on all architectures except 64-bit
276 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
278 * The ChangeLog file is no longer present in the toplevel directory of the
279 source tree. ChangeLog files are located in the ChangeLog.old directory as
280 ChangeLog.N where the highest N has the latest entries.
282 Security related changes:
284 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
285 environment variable during program execution after a security
286 transition, allowing local attackers to restrict the possible mapping
287 addresses for loaded libraries and thus bypass ASLR for a setuid
288 program. Reported by Marcin Kościelnicki.
290 The following bugs are resolved with this release:
292 [12031] localedata: iconv -t ascii//translit with Greek characters
293 [15813] libc: Multiple issues in __gen_tempname
294 [17726] libc: [arm, sparc] profil_counter should be compat symbol
295 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
296 [19767] libc: vdso is not used with static linking
297 [19903] hurd: Shared mappings not being inherited by children processes
298 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
299 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
301 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
302 Symbols-A/B Unicode blocks
303 [23518] libc: Eliminate __libc_utmp_jump_table
304 [24026] malloc: malloc_info() returns wrong numbers
305 [24054] localedata: Many locales are missing date_fmt
306 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
307 [24304] dynamic-link: Lazy binding failure during ELF
308 constructors/destructors is not fatal
309 [24376] libc: RISC-V symbol size confusion with _start
310 [24682] localedata: zh_CN first weekday should be Monday per GB/T
312 [24824] libc: test-in-container does not install charmap files compatible
314 [24844] regex: regex bad pointer / leakage if malloc fails
315 [24867] malloc: Unintended malloc_info formatting changes
316 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
317 [24880] libc: login: utmp implementation uses struct flock with fcntl64
318 [24882] libc: login: pututline uses potentially outdated cache
319 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
320 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
322 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
324 [24930] dynamic-link: dlopen of PIE executable can result in
325 _dl_allocate_tls_init assertion failure
326 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
327 (stringop-overflow error)
328 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
329 functions other can lead to crashes
330 [24967] libc: jemalloc static linking causes runtime failure
331 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
333 [25035] libc: sbrk() failure handled poorly in tunables_strdup
334 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
335 [25097] libc: new -Warray-bounds with GCC 10
336 [25112] dynamic-link: dlopen must not make new objects accessible when it
337 still can fail with an error
338 [25139] localedata: Please add the new mnw_MM locale
339 [25149] regex: Array bounds violation in proceed_next_node
340 [25157] dynamic-link: Audit cookie for the dynamic loader is not
341 initialized correctly
342 [25189] libc: glibc's __glibc_has_include causes issues with clang
344 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
346 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
347 binaries (CVE-2019-19126)
348 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
350 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
352 [25232] string: <string.h> does not enable const correctness for strchr et
354 [25233] localedata: Consider "." as the thousands separator for sl_SI
356 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
357 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
358 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
360 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
361 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
363 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
364 (dl_initfirst) link map pointer
365 [25401] malloc: pvalloc must not have __attribute_alloc_size__
366 [25423] libc: Array overflow in backtrace on powerpc
367 [25425] network: Missing call to __resolv_context_put in
368 getaddrinfo.c:gethosts
375 * Unicode 12.1.0 Support: Character encoding, character type info, and
376 transliteration tables are all updated to Unicode 12.1.0, using
377 generator scripts contributed by Mike FABIAN (Red Hat).
379 * The dynamic linker accepts the --preload argument to preload shared
380 objects, in addition to the LD_PRELOAD environment variable.
382 * The twalk_r function has been added. It is similar to the existing
383 twalk function, but it passes an additional caller-supplied argument
384 to the callback function.
386 * On Linux, the getdents64, gettid, and tgkill functions have been added.
388 * Minguo (Republic of China) calendar support has been added as an
389 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
392 * The entry for the new Japanese era has been added for ja_JP locale.
394 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
395 pvalloc, memalign, and posix_memalign fail now with total object size
396 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
397 pointer subtraction within the allocated object, where results might
398 overflow the ptrdiff_t type.
400 * The dynamic linker no longer refuses to load objects which reference
401 versioned symbols whose implementation has moved to a different soname
402 since the object has been linked. The old error message, symbol
403 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
404 link time reference, is gone.
406 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
407 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
408 functions. These behave similarly to their "timed" equivalents, but also
409 accept a clockid_t parameter to determine which clock their timeout should
410 be measured against. All functions allow waiting against CLOCK_MONOTONIC
411 and CLOCK_REALTIME. The decision of which clock to be used is made at the
412 time of the wait (unlike with pthread_condattr_setclock, which requires
413 the clock choice at initialization time).
415 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
416 work, new resolvers can use a second argument which can be extended in
417 the future, currently it contains the AT_HWCAP2 value.
419 Deprecated and removed features, and other changes affecting compatibility:
421 * The copy_file_range function fails with ENOSYS if the kernel does not
422 support the system call of the same name. Previously, user space
423 emulation was performed, but its behavior did not match the kernel
424 behavior, which was deemed too confusing. Applications which use the
425 copy_file_range function can no longer rely on glibc to provide a fallback
426 on kernels that do not support the copy_file_range system call, and if
427 this function returns ENOSYS, they will need to use their own fallback.
428 Support for copy_file_range for most architectures was added in version
429 4.5 of the mainline Linux kernel.
431 * The functions clock_gettime, clock_getres, clock_settime,
432 clock_getcpuclockid, clock_nanosleep were removed from the librt library
433 for new applications (on architectures which had them). Instead, the
434 definitions in libc will be used automatically, which have been available
437 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
438 and <sys/stropts.h> have been removed.
440 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
441 resolver flag (deprecated in glibc 2.25) have been removed.
443 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
444 resolver have been removed from <resolv.h>.
446 * With --enable-bind-now, installed programs are now linked with the
449 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
450 configurations) has been removed, following the deprecation of this
451 subarchitecture in version 8 of GCC, and its removal in version 9.
453 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
454 header have been removed.
456 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
457 deprecated and will be removed from a future version of glibc.
458 Application should directly access /proc instead. For obtaining random
459 bits, the getentropy function can be used.
461 Changes to build and runtime requirements:
463 * GCC 6.2 or later is required to build the GNU C Library.
465 Older GCC versions and non-GNU compilers are still supported when
466 compiling programs that use the GNU C Library.
468 Security related changes:
470 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
471 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
472 has undefined behavior. On x32, the size_t argument may be passed
473 in the lower 32 bits of the 64-bit RDX register with non-zero upper
474 32 bits. When it happened with the sign bit of RDX register set,
475 memcmp gave the wrong result since it treated the size argument as
476 zero. Reported by H.J. Lu.
478 CVE-2019-9169: Attempted case-insensitive regular-expression match
479 via proceed_next_node in posix/regexec.c leads to heap-based buffer
480 over-read. Reported by Hongxu Chen.
482 The following bugs are resolved with this release:
484 [2872] locale: Transliteration Cyrillic -> ASCII fails
485 [6399] libc: gettid() should have a wrapper
486 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
487 [16976] glob: fnmatch unbounded stack VLA for collating symbols
488 [17396] localedata: globbing for locale by [[.collating-element.]]
489 [18035] dynamic-link: pldd does no longer work, enters infinite loop
490 [18465] malloc: memusagestat is built using system C library
491 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
492 invalid input drops valid char
493 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
494 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
495 [21897] localedata: Afar locales: Fix mon, abmon, and abday
496 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
497 [23352] malloc: __malloc_check_init still defined in public header
499 [23403] nptl: Wrong alignment of TLS variables
500 [23501] libc: nftw() doesn't return dangling symlink's inode
501 [23733] malloc: Check the count before calling tcache_get()
502 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
504 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
505 [23844] nptl: pthread_rwlock_trywrlock results in hang
506 [23983] argparse: Missing compat versions of argp_failure and argp_error
507 for long double = double
508 [23984] libc: Missing compat versions of err.h and error.h functions for
510 [23996] localedata: Dutch salutations
511 [24040] libc: riscv64: unterminated call chain in __thread_start
512 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
514 [24051] stdio: puts and putchar ouput to _IO_stdout instead of stdout
515 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
517 [24114] regex: regexec buffer read overrun in "grep -i
518 '\(\(\)*.\)*\(\)\(\)\1'"
519 [24122] libc: Segfaults if 0 returned from la_version
520 [24153] stdio: Some input functions do not react to stdin assignment
521 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
522 RDX is set) (CVE-2019-7309)
523 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
524 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
525 not the default "nor"
526 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
527 false positives, change to modern flexible array
528 [24180] nptl: pthread_mutex_trylock does not use the correct order of
529 instructions while maintaining the robust mutex list due to missing
531 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
532 unnecessary librt dependencies
533 [24200] localedata: Revert first_weekday removal in en_IE locale
534 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
535 [24215] nptl: pthread_timedjoin_np should be a cancellation point
536 [24216] malloc: Check for large bin list corruption when inserting
538 [24228] stdio: old x86 applications that use legacy libio crash on exit
539 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
541 [24293] localedata: Missing Minguo calendar support for TW locales
542 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
544 [24307] localedata: Update locale data to Unicode 12.0.0
545 [24323] dynamic-link: dlopen should not be able open PIE objects
546 [24335] build: "Obsolete types detected" with Linux 5.0 headers
547 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
549 [24370] localedata: Add lang_name for tt_RU locale
550 [24372] locale: Binary locale files are not architecture independent
551 [24394] time: strptime %Ey mis-parses final year of era
552 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
554 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
556 [24531] malloc: Malloc tunables give tcache assertion failures
557 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
559 [24535] localedata: Update locale data to Unicode 12.1.0
560 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
561 kernels and break testing
562 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
563 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
564 [-Werror=format-overflow=]
565 [24570] libc: alpha: compat msgctl uses __IPC_64
566 [24584] locale: Data race in __wcsmbs_clone_conv
567 [24588] stdio: Remove codecvt vtables from libio
568 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
570 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
571 [24632] stdio: Old binaries which use freopen with default stdio handles
573 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
575 [24652] localedata: szl_PL spelling correction
576 [24695] nss: nss_db: calling getpwent after endpwent crashes
577 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
578 in /etc/nsswitch.conf
579 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
580 [24740] libc: getdents64 type confusion
581 [24741] dynamic-link: ld.so should not require that a versioned symbol is
582 always implemented in the same library
583 [24744] libc: Remove copy_file_range emulation
584 [24757] malloc: memusagestat is linked against system libpthread
585 [24794] libc: Partial test suite run builds corrupt test-in-container
593 * The getcpu wrapper function has been added, which returns the currently
594 used CPU and NUMA node. This function is Linux-specific.
596 * A new convenience target has been added for distribution maintainers
597 to build and install all locales as directories with files. The new
598 target is run by issuing the following command in your build tree:
599 'make localedata/install-locale-files', with an optional DESTDIR
600 to set the install root if you wish to install into a non-default
603 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
605 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
606 for _GNU_SOURCE, to match BSD environments.
608 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
609 indicates that it will abort the transaction prior to entering the kernel
610 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
611 suspended, and this caused some undefined side-effects issues by aborting
612 transactions manually. Glibc avoided it by abort transactions manually on
613 each syscall, but it lead to performance issues on newer kernels where the
614 HTM state is saved and restore lazily (the state being saved even when the
615 process actually does not use HTM).
617 * The functions posix_spawn_file_actions_addchdir_np and
618 posix_spawn_file_actions_addfchdir_np have been added, enabling
619 posix_spawn and posix_spawnp to run the new process in a different
620 directory. These functions are GNU extensions. The function
621 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
624 * The popen and system do not run atfork handlers anymore (BZ#17490).
625 Although it is a possible POSIX violation, the POSIX rationale in
626 pthread_atfork documentation regarding atfork handlers is to handle
627 inconsistent mutex state after a fork call in a multi-threaded process.
628 In both popen and system there is no direct access to user-defined mutexes.
630 * Support for the C-SKY ABIV2 running on Linux has been added. This port
631 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
633 - C-SKY ABIV2 soft-float little-endian
634 - C-SKY ABIV2 hard-float little-endian
636 * strftime's default formatting of a locale's alternative year (%Ey)
637 has been changed to zero-pad the year to a minimum of two digits,
638 like "%y". This improves the display of Japanese era years during
639 the first nine years of a new era, and is expected to be harmless
640 for all other locales (only Japanese locales regularly have
641 alternative year numbers less than 10). Zero-padding can be
642 overridden with the '_' or '-' flags (which are GNU extensions).
644 * As a GNU extension, the '_' and '-' flags can now be applied to
645 "%EY" to control how the year number is formatted; they have the
646 same effect that they would on "%Ey".
648 Deprecated and removed features, and other changes affecting compatibility:
650 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
651 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
653 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
654 in <sys/procfs.h>, has been corrected to match the type actually used by
655 the Linux kernel. This affects the size and layout of that structure on
656 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
658 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
659 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
660 defined in <sys/procfs.h>, has been corrected to match the type actually
661 used by the Linux kernel. This affects the size and layout of those
664 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
665 meant to scan a string and allocate space for it with malloc, is now
666 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
667 defined. This extension conflicts with C99's use of '%a' to scan a
668 hexadecimal floating-point number, which is now available to programs
669 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
671 POSIX.1-2008 includes the feature of allocating a buffer for string input
672 with malloc, using the modifier letter 'm' instead. Programs using
673 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
674 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
675 C99 '%a' no longer need to avoid _GNU_SOURCE.
677 GCC's -Wformat warnings can detect most uses of this extension, as long
678 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
679 __attribute__ ((format (scanf, ...))).
681 Changes to build and runtime requirements:
683 * Python 3.4 or later is required to build the GNU C Library.
685 * On most architectures, GCC 5 or later is required to build the GNU C
686 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
688 Older GCC versions and non-GNU compilers are still supported when
689 compiling programs that use the GNU C Library.
691 Security related changes:
693 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
694 denial of service due to resource exhaustion when processing getaddrinfo
695 calls with crafted host names. Reported by Guido Vranken.
697 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
698 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
699 happened, accessing the 32-bit size_t value as the full 64-bit register
700 in the assembly string/memory functions would cause a buffer overflow.
703 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
704 addresses with arbitrary trailing characters, potentially leading to data
705 or command injection issues in applications.
707 The following bugs are resolved with this release:
709 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
710 [10496] localedata: 12h time representation in multiple locales faulty
711 [10797] localedata: it_IT locale numeric does not have a separator for
713 [11319] libc: dprintf doesn't handle errors properly
714 [16346] time: mktime: potentially unsafe use of localtime_offset
715 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
717 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
718 posix_spawn_file_actions_addfchdir_np
719 [17426] localedata: Indian locales: set the correct date format
720 [17490] stdio: popen should not invoke atfork handlers
721 [17783] libc: TIOCSER_TEMT conditions inconsistent
722 [18040] regex: use-after-free in regexec/get_subexp
723 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
724 [20018] network: getaddrinfo should reject IP addresses with trailing
725 characters (CVE-2016-10739)
726 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
727 [20271] libc: Missing "\n" in __libc_fatal calls
728 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
729 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
730 pointer argument is non-NULL
731 [21037] stdio: open_memstream and freopen
732 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
733 [21716] time: Crash in glibc's mktime in low-memory situations
734 [22834] stdio: Subprocess forked by popen may crash in Linux when
735 multithreads call popen
736 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
737 and pthread_create fails.
738 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
739 [23125] libc: riscv64: endless loop when throwing an exception from a
741 [23275] nptl: Race in pthread_mutex_lock while promoting to
742 PTHREAD_MUTEX_ELISION_NP.
743 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
745 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
747 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
749 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
750 [23509] dynamic-link: CET enabled glibc is incompatible with the older
752 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
753 [23521] nss: get_next_alias nss_files file stream leak
754 [23538] nptl: Hang in pthread_cond_broadcast
755 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
756 [23578] regex: Invalid memory access if regex pattern contains NUL byte
757 [23579] libc: Errors misreported in preadv2
758 [23597] build: support/test-container.c doesn't work with different
760 [23603] time: mktime signed integer overflow on large timestamps
761 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
762 [23614] libc: powerpc: missing CFI register information in __mpn_*
764 [23637] string: Generic strstr/strcasestr fails with huge needles
765 [23640] libc: no way to easily clear FD_CLOEXEC in
766 posix_spawn_file_actions_adddup2()
767 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
769 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
771 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
772 [23689] libc: Bug in documentation for rusage.ru_ixrss in
773 bits/types/struct_rusage.h
774 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
776 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
778 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
779 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
780 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
782 [23724] localedata: Albanian date formats are incorrect
783 [23735] math: libnldbl_nonshared.a references internal libm symbols
784 [23740] localedata: kl_GL: Month names and date formats need update
785 [23744] regex: regex refactorings to remove BE, avoid duplication
786 [23745] time: mktime fix for Gnulib + coreutils
787 [23758] time: Improve the width of alternate representation for year in
789 [23783] libc: [mips] Missing CMSPAR bits/termios.h
790 [23789] time: mktime does not set errno on failure
791 [23791] localedata: Wrong monetary format for ca_ES locale
792 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
793 [23794] locale: c16rtomb does not handle surrogate pairs
794 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
795 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
796 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
797 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
798 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
799 [23862] libc: [sh] missing kernel-features.h undefines
800 [23864] libc: [riscv] missing kernel-features.h undefines
801 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
802 [23907] malloc: Incorrect double-free malloc tcache check disregards
804 [23913] libc: off-by-one in function maybe_script_execute in
805 sysdeps/posix/spawni.c
806 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
807 [23923] locale: Add --no-hard-links option to localedef
808 [23927] network: Linux if_nametoindex() does not close descriptor
810 [23961] math: powf can overflow to inf without setting errno in non-
811 nearest rounding mode
812 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
813 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
814 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
815 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
816 [24011] localedata: Fixed small type in comment for locale bs_BA
817 [24018] libc: gettext() may return NULL
818 [24022] build: riscv build failure with Linux kernel 4.20-rc7
819 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
820 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
822 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
823 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
825 [24046] localedata: en_US locale doesn't define date_fmt
826 [24063] manual: @var{errno} should be @code{errno}
827 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
828 [24088] libc: VSCR field is not being correctly read in ucontext_t on
830 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
832 [24097] string: Can't use 64-bit register for size_t in assembly codes for
834 [24110] hurd: SS_DISABLE never set in stack_t value returned by
836 [24112] network: Do not send DNS queries for non-host names (where all
837 answers will be rejected)
838 [24130] libc: alpha __remqu corrupts $f3 register
845 * The localization data for ISO 14651 is updated to match the 2016
846 Edition 4 release of the standard, this matches data provided by
847 Unicode 9.0.0. This update introduces significant improvements to the
848 collation of Unicode characters. This release deviates slightly from
849 the standard in that the collation element ordering for lowercase and
850 uppercase LATIN script characters is adjusted to ensure that regular
851 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
852 is not matched by [a-z]. With the update many locales have been
853 updated to take advantage of the new collation information. The new
854 collation information has increased the size of the compiled locale
855 archive or binary locales.
857 * The GNU C Library can now be compiled with support for Intel CET, AKA
858 Intel Control-flow Enforcement Technology. When the library is built
859 with --enable-cet, the resulting glibc is protected with indirect
860 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
861 compatible with all existing executables and shared libraries. This
862 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
863 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
864 capable of multi-byte NOPs, like x86-64 processors as well as Intel
865 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
866 x86_64 and x32 on non-CET processors. --enable-cet has been tested
867 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
870 * The GNU C Library now has correct support for ABSOLUTE symbols
871 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
872 relocated incorrectly or in some cases discarded. The GNU linker can
873 make use of the newer semantics, but it must communicate it to the
874 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
875 field) to indicate such support is required.
877 * Unicode 11.0.0 Support: Character encoding, character type info, and
878 transliteration tables are all updated to Unicode 11.0.0, using
879 generator scripts contributed by Mike FABIAN (Red Hat).
881 * <math.h> functions that round their results to a narrower type are added
882 from TS 18661-1:2014 and TS 18661-3:2015:
884 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
887 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
890 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
893 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
896 * Two grammatical forms of month names are now supported for the following
897 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
898 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
899 support two grammatical forms in abbreviated month names: Catalan, Greek,
902 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
903 include the support for two grammatical forms of month names.
905 * Building and running on GNU/Hurd systems now works without out-of-tree
908 * The renameat2 function has been added, a variant of the renameat function
909 which has a flags argument. If the flags are zero, the renameat2 function
910 acts like renameat. If the flag is not zero and there is no kernel
911 support for renameat2, the function will fail with an errno value of
912 EINVAL. This is different from the existing gnulib function renameatu,
913 which performs a plain rename operation in case of a RENAME_NOREPLACE
914 flags and a non-existing destination (and therefore has a race condition
915 that can clobber the destination inadvertently).
917 * The statx function has been added, a variant of the fstatat64
918 function with an additional flags argument. If there is no direct
919 kernel support for statx, glibc provides basic stat support based on
920 the fstatat64 function.
922 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
923 library if installed. libidn2 version 2.0.5 or later is recommended. If
924 libidn2 is not available, internationalized domain names are not encoded
925 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
926 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
927 with an encoding error.) Flags which used to change the IDN encoding and
928 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
929 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
930 deprecated. They no longer have any effect.
932 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
933 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
934 range of ELF gABI expressions including such constructs as
935 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
936 have been further restricted, and where in the past a dynamic string
937 token sequence may have been interpreted as a literal string it will
938 now cause a load failure. These load failures were always considered
939 unspecified behaviour from the perspective of the dynamic loader, and
940 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
941 results in a load failure now.
943 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
944 implementation includes all the standard functions provided by
947 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
948 thrd_detach, thrd_exit, and thrd_join for thread management.
950 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
951 mtx_destroy for mutual exclusion.
953 - call_once for function call synchronization.
955 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
956 cnd_wait for conditional variables.
958 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
960 Application developers must link against libpthread to use ISO C threads.
962 Deprecated and removed features, and other changes affecting compatibility:
964 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
965 installed. Software that was using either header should be updated to
966 use standard <stdio.h> interfaces instead.
968 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
969 This was never required by the C standard, and the macros just expanded
970 to call alternative names for the same functions. If you hoped getc and
971 putc would provide performance improvements over fgetc and fputc, instead
972 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
973 necessary, flockfile and funlockfile.
975 * All stdio functions now treat end-of-file as a sticky condition. If you
976 read from a file until EOF, and then the file is enlarged by another
977 process, you must call clearerr or another function with the same effect
978 (e.g. fseek, rewind) before you can read the additional data. This
979 corrects a longstanding C99 conformance bug. It is most likely to affect
980 programs that use stdio to read interactive input from a terminal.
983 * The macros 'major', 'minor', and 'makedev' are now only available from
984 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
985 headers that happen to include <sys/types.h>. These macros are rarely
986 used, not part of POSIX nor XSI, and their names frequently collide with
987 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
990 <sys/sysmacros.h> is a GNU extension. Portable programs that require
991 these macros should first include <sys/types.h>, and then include
992 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
994 * The tilegx*-*-linux-gnu configurations are no longer supported.
996 * The obsolete function ustat is no longer available to newly linked
997 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
998 function has been deprecated in favor of fstatfs and statfs.
1000 * The obsolete function nfsservctl is no longer available to newly linked
1001 binaries. This function was specific to systems using the Linux kernel
1002 and could not usefully be used with the GNU C Library on systems with
1003 version 3.1 or later of the Linux kernel.
1005 * The obsolete function name llseek is no longer available to newly linked
1006 binaries. This function was specific to systems using the Linux kernel
1007 and was not declared in a header. Programs should use the lseek64 name
1008 for this function instead.
1010 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1011 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1012 previously selected by them is now always enabled.
1014 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1015 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1016 restriction (rejecting '_' in host names, among other things) has been
1017 removed, for increased compatibility with non-IDN name resolution.
1019 * The fcntl function now have a Long File Support variant named fcntl64. It
1020 is added to fix some Linux Open File Description (OFD) locks usage on non
1021 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1022 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1023 locks act as a cancellation entrypoint.
1025 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1026 ecb_crypt, and des_setparity are no longer available to newly linked
1027 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1028 longer installed. These functions encrypted and decrypted data with the
1029 DES block cipher, which is no longer considered secure. Software that
1030 still uses these functions should switch to a modern cryptography library,
1033 * Reflecting the removal of the encrypt and setkey functions above, the
1034 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1035 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1038 * The obsolete function fcrypt is no longer available to newly linked
1039 binaries. It was just another name for the standard function crypt,
1040 and it has not appeared in any header file in many years.
1042 * We have tentative plans to hand off maintenance of the passphrase-hashing
1043 library, libcrypt, to a separate development project that will, we hope,
1044 keep up better with new passphrase-hashing algorithms. We will continue
1045 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1046 'crypt_r' should not need to change at all; however, distributions will
1047 need to install <crypt.h> and libcrypt from a separate project.
1049 In this release, if the configure option --disable-crypt is used, glibc
1050 will not install <crypt.h> or libcrypt, making room for the separate
1051 project's versions of these files. The plan is to make this the default
1052 behavior in a future release.
1054 Changes to build and runtime requirements:
1056 GNU make 4.0 or later is now required to build glibc.
1058 Security related changes:
1060 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1061 been fixed by removing the glibc-internal IDNA implementation and using
1062 the system-provided libidn2 library instead. Originally reported by Hanno
1063 Böck and Christian Weisgerber.
1065 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1066 architecture could corrupt memory. Reported by Max Horn.
1068 CVE-2018-11236: Very long pathname arguments to realpath function could
1069 result in an integer overflow and buffer overflow. Reported by Alexey
1072 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1073 architecture could write beyond the target buffer, resulting in a buffer
1074 overflow. Reported by Andreas Schwab.
1076 The following bugs are resolved with this release:
1078 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1079 [6889] manual: 'PWD' mentioned but not specified
1080 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1081 when __WORDSIZE != 64
1082 [13762] regex: re_search etc. should return -2 on memory exhaustion
1083 [13888] build: /tmp usage during testing
1084 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1085 [14092] nptl: Support C11 threads
1086 [14095] localedata: Review / update collation data from Unicode / ISO
1088 [14508] libc: -Wformat warnings
1089 [14553] libc: Namespace pollution loff_t in sys/types.h
1090 [14890] libc: Make NT_PRFPREG canonical.
1091 [15105] libc: Extra PLT references with -Os
1092 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1094 [16335] manual: Feature test macro documentation incomplete and out of
1096 [16552] libc: Unify umount implementations in terms of umount2
1097 [17082] libc: htons et al.: statement-expressions prevent use on global
1098 scope with -O1 and higher
1099 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1100 [17438] localedata: pt_BR: wrong d_fmt delimiter
1101 [17662] libc: please implement binding for the new renameat2 syscall
1102 [17721] libc: __restrict defined as /* Ignore */ even in c11
1103 [17979] libc: inconsistency between uchar.h and stdint.h
1104 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1105 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1106 horrible machine code)
1107 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1109 [18471] libc: llseek should be a compat symbol
1110 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1112 [18991] nss: nss_files skips large entry in database
1113 [19239] libc: Including stdlib.h ends up with macros major and minor being
1115 [19463] libc: linknamespace failures when compiled with -Os
1116 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1117 [19527] locale: Normalized charset name not recognized by setlocale
1118 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1119 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1121 [19728] network: out of bounds stack read in libidn function
1122 idna_to_ascii_4i (CVE-2016-6261)
1123 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1124 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1125 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1127 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1128 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1129 [20419] dynamic-link: files with large allocated notes crash in
1131 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1132 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1133 [20980] manual: CFLAGS environment variable replaces vital options
1134 [21163] regex: Assertion failure in pop_fail_stack when executing a
1135 malformed regexp (CVE-2015-8985)
1136 [21234] manual: use of CFLAGS makes glibc detect no optimization
1137 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1138 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1139 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1140 [21508] locale: intl/tst-gettext failure with latest msgfmt
1141 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1142 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1143 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1145 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1147 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1148 [22247] network: Integer overflow in the decode_digit function in
1149 puny_decode.c in libidn (CVE-2017-14062)
1150 [22342] nscd: NSCD not properly caching netgroup
1151 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1152 [22550] localedata: es_ES locale (and other es_* locales): collation
1153 should treat ñ as a primary different character, sync the collation
1154 for Spanish with CLDR
1155 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1156 by gcc configured with --enable-default-pie
1157 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1158 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1159 crossing 2GB threshold (CVE-2017-18269)
1160 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1162 [22735] time: Misleading typo in time.h source comment regarding
1164 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1165 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1166 `__assert_perror_fail ()' to `__assert_fail_base ()'
1167 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1169 [22786] libc: Stack buffer overflow in realpath() if input size is close
1170 to SSIZE_MAX (CVE-2018-11236)
1171 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1172 through an absolute DT_NEEDED path
1173 [22792] build: tcb-offsets.h dependency dropped
1174 [22797] libc: pkey_get() uses non-reserved name of argument
1175 [22807] libc: PTRACE_* constants missing for powerpc
1176 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1177 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1178 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1179 [22848] localedata: ca_ES: update date definitions from CLDR
1180 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1181 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1182 [22896] localedata: Update locale data for an_ES
1183 [22902] math: float128 test failures with GCC 8
1184 [22918] libc: multiple common of `__nss_shadow_database'
1185 [22919] libc: sparc32: backtrace yields infinite backtrace with
1187 [22926] libc: FTBFS on powerpcspe
1188 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1190 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1191 [22947] libc: FAIL: misc/tst-preadvwritev2
1192 [22963] localedata: cs_CZ: Add alternative month names
1193 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1194 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1195 [22998] dynamic-link: execstack tests are disabled when SELinux is
1197 [23005] network: Crash in __res_context_send after memory allocation
1199 [23007] math: strtod cannot handle -nan
1200 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1201 [23036] regex: regex equivalence class regression
1202 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1203 [23069] libc: sigaction broken on riscv64-linux-gnu
1204 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1205 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1206 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1207 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1208 and libc build with -Os)
1209 [23140] localedata: More languages need two forms of month names
1210 [23145] libc: _init/_fini aren't marked as hidden
1211 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1212 [23171] math: C++ iseqsig for long double converts arguments to double
1213 [23178] nscd: sudo will fail when it is run in concurrent with commands
1214 that changes /etc/passwd
1215 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1217 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1218 [23208] localedata: New locale - Lower Sorbian (dsb)
1219 [23233] regex: Memory leak in build_charclass_op function in file
1221 [23236] stdio: Harden function pointers in _IO_str_fields
1222 [23250] nptl: Offset of __private_ss differs from GCC
1223 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1224 -mtune=generic -mfpmath=sse
1225 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1227 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1228 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1230 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1231 [23277] math: nan function should not have const attribute
1232 [23279] math: scanf and strtod wrong for some hex floating-point
1233 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1235 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1236 [23303] build: undefined reference to symbol
1237 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1238 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1240 [23313] stdio: libio vtables validation and standard file object
1242 [23329] libc: The __libc_freeres infrastructure is not properly run across
1244 [23349] libc: Various glibc headers no longer compatible with
1246 [23351] malloc: Remove unused code related to heap dumps and malloc
1248 [23363] stdio: stdio-common/tst-printf.c has non-free license
1249 [23396] regex: Regex equivalence regression in single-byte locales
1250 [23422] localedata: oc_FR: More updates of locale data
1251 [23442] build: New warning with GCC 8
1252 [23448] libc: Out of bounds access in IBM-1390 converter
1253 [23456] libc: Wrong index_cpu_LZCNT
1254 [23458] build: tst-get-cpu-features-static isn't added to tests
1255 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1257 [23467] dynamic-link: x86/CET: A property note parser bug
1264 * The GNU C Library can now be compiled with support for building static
1265 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1266 executables are like static executables but can be loaded at any address
1267 and provide additional security hardening benefits at the cost of some
1268 memory and performance. When the library is built with --enable-static-pie
1269 the resulting libc.a is usable with GCC 8 and above to create static PIE
1270 executables using the GCC option '-static-pie'. This feature is currently
1271 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1272 aarch64 with binutils 2.30 or later.
1274 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1275 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1278 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1280 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1282 * In order to support faster and safer process termination the malloc API
1283 family of functions will no longer print a failure address and stack
1284 backtrace after detecting heap corruption. The goal is to minimize the
1285 amount of work done after corruption is detected and to avoid potential
1286 security issues in continued process execution. Reducing shutdown time
1287 leads to lower overall process restart latency, so there is benefit both
1288 from a security and performance perspective.
1290 * The abort function terminates the process immediately, without flushing
1291 stdio streams. Previous glibc versions used to flush streams, resulting
1292 in deadlocks and further data corruption. This change also affects
1293 process aborts as the result of assertion failures.
1295 * On platforms where long double has the IEEE binary128 format (aarch64,
1296 alpha, mips64, riscv, s390 and sparc), the math library now implements
1297 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1298 These are the same interfaces added in version 2.26 for some platforms where
1299 this format is supported but is not the format of long double.
1301 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1302 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1303 implements interfaces for that type, as defined by ISO/IEC TS
1304 18661-3:2015. These are corresponding interfaces to those supported for
1307 * The math library now implements interfaces for the _Float32, _Float64 and
1308 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1309 corresponding interfaces to those supported for _Float128.
1311 * glibc now implements the memfd_create and mlock2 functions on Linux.
1313 * Support for memory protection keys was added. The <sys/mman.h> header now
1314 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1317 * The copy_file_range function was added.
1319 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1321 * The ldconfig utility now processes `include' directives using the C/POSIX
1322 collation ordering. Previous glibc versions used locale-specific
1323 ordering, the change might break systems that relied on that.
1325 * Support for two grammatical forms of month names has been added.
1326 In a call to strftime, the "%B" and "%b" format specifiers will now
1327 produce the grammatical form required when the month is used as part
1328 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1329 required when the month is named by itself. For instance, in Greek
1330 and in many Slavic and Baltic languages, "%B" will produce the month
1331 in genitive case, and "%OB" will produce the month in nominative case.
1333 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1334 are all valid and will all accept any known form of month
1335 name---standalone or complete, abbreviated or full. In a call to
1336 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1337 the strings used by "%B" and "%b", respectively. New query
1338 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1339 used by "%OB" and "%Ob", respectively.
1341 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1342 define the strings for %OB and %Ob, respectively; these have the
1343 same syntax as "mon" and "abmon". These arrays are optional; if they
1344 are not provided then they have the same content as "mon" and "abmon",
1347 These features are provided for locales which define "alt_mon" and/or
1348 "ab_alt_mon" in their locale source data. This release includes such
1349 alternative month name data for the following languages: Belarusian,
1350 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1352 This feature is currently a GNU extension, but it is expected to
1353 be added to the next revision of POSIX, and it is also already
1354 available on some BSD-derived operating systems.
1356 This feature will cause existing statically compiled applications
1357 to fail to load locales and fall back to the builtin C/POSIX locales.
1358 See notes below for other changes affecting compatibility.
1360 * Support for the RISC-V ISA running on Linux has been added. This port
1361 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1362 for the following ISA and ABI pairs:
1368 Deprecated and removed features, and other changes affecting compatibility:
1370 * Statically compiled applications attempting to load locales compiled for the
1371 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1372 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1373 support for two grammatical forms of the month names, also extends the locale
1374 data binary format. Static applications needing locale support must be
1375 recompiled to match the runtime and data they are deployed with. In some
1376 distributions there is an upgrade window where dynamically linked applications
1377 may use a new library but the old locale data and also fall back to the
1378 builtin C/POSIX locales; restarting the application process is sufficient to
1381 * Support for statically linked applications which call dlopen is deprecated
1382 and will be removed in a future version of glibc. Applications which call
1383 dlopen need to be linked dynamically instead.
1385 * Support for old programs which use internal stdio data structures and
1386 functions is deprecated. This includes programs which use the C++ streams
1387 provided by libstdc++ in GCC 2.95. Programs which use the internal
1388 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1389 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1390 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1391 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1392 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1393 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1394 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1395 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1396 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1397 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1398 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1399 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1400 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1401 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1402 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1403 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1404 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1405 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1406 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1407 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1408 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1409 future version of glibc. Unlike other symbol removals, these old
1410 applications will not be supported using compatibility symbols.
1412 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1413 defined by <sys/ptrace.h>.
1415 * libm no longer supports SVID error handling (calling a user-provided
1416 matherr function on error) or the _LIB_VERSION variable to control error
1417 handling. (SVID error handling and the _LIB_VERSION variable still work
1418 for binaries linked against older versions of the GNU C Library.) The
1419 libieee.a library is no longer provided. math.h no longer defines struct
1420 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1421 TLOSS, PLOSS and HUGE.
1423 * The libm functions pow10, pow10f and pow10l are no longer supported for
1424 new programs. Programs should use the standard names exp10, exp10f and
1425 exp10l for these functions instead.
1427 * The mcontext_t type is no longer the same as struct sigcontext. On
1428 platforms where it was previously the same, this changes the C++ name
1429 mangling for interfaces involving this type.
1431 * The add-ons mechanism for building additional packages at the same time as
1432 glibc has been removed. The --enable-add-ons configure option is now
1435 * The --without-fp configure option is now ignored. Whether hardware
1436 floating-point instructions are used is now configured based on whether
1437 the compiler used at configure time (without any options implied by a
1438 --with-cpu= configure option) uses such instructions.
1440 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1441 the specified string can be parsed as a domain name.
1443 * In the malloc_info output, the <heap> element may contain another <aspace>
1444 element, "subheaps", which contains the number of sub-heaps.
1446 * The libresolv function p_secstodate is no longer supported for new
1449 * The tilepro-*-linux-gnu configuration is no longer supported.
1451 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1452 and will be removed in a future release. Software that is still using
1453 either header should be updated to use standard <stdio.h> interfaces
1456 libio.h was originally the header for a set of supported GNU extensions,
1457 but they have not been maintained as such in many years, they are now
1458 standing in the way of improvements to stdio, and we don't think there are
1459 any remaining external users. _G_config.h was never intended for public
1460 use, but predates the bits convention.
1462 Changes to build and runtime requirements:
1464 * bison version 2.7 or later is required to generate code in the 'intl'
1467 Security related changes:
1469 CVE-2009-5064: The ldd script would sometimes run the program under
1470 examination directly, without preventing code execution through the
1471 dynamic linker. (The glibc project disputes that this is a security
1472 vulnerability; only trusted binaries must be examined using the ldd
1475 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1476 suffered from a one-byte overflow during ~ operator processing (either
1477 on the stack or the heap, depending on the length of the user name).
1478 Reported by Tim Rühsen.
1480 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1481 would sometimes fail to free memory allocated during ~ operator
1482 processing, leading to a memory leak and, potentially, to a denial
1485 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1486 without GLOB_NOESCAPE, could write past the end of a buffer while
1487 unescaping user names. Reported by Tim Rühsen.
1489 CVE-2017-17426: The malloc function, when called with an object size near
1490 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1491 instead of NULL. This was a regression introduced with the new malloc
1492 thread cache in glibc 2.26. Reported by Iain Buclaw.
1494 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1495 to the allocation of too much memory. (This is not a security bug per se,
1496 it is mentioned here only because of the CVE assignment.) Reported by
1499 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1500 of the number of search path components. (This is not a security
1501 vulnerability per se because no trust boundary is crossed if the fix for
1502 CVE-2017-1000366 has been applied, but it is mentioned here only because
1503 of the CVE assignment.) Reported by Qualys.
1505 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1506 for AT_SECURE or SUID binaries could be used to load libraries from the
1509 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1510 succeeds without returning an absolute path due to unexpected behaviour
1511 of the Linux kernel getcwd syscall. Reported by halfdog.
1513 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1514 an object size near the value of SIZE_MAX, would return a pointer to a
1515 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1517 CVE-2018-6551: The malloc function, when called with an object size near
1518 the value of SIZE_MAX, would return a pointer to a buffer which is too
1519 small, instead of NULL.
1521 The following bugs are resolved with this release:
1523 [866] glob: glob should match dangling symlinks
1524 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1525 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1527 [5997] math: Very slow execution of sinf function
1528 [10580] localedata: hr_HR: updated locale
1529 [10871] locale: 'mon' array should contain both nominative and genitive
1531 [12349] localedata: eu_ES: incorrect thousands separator
1532 [13605] localedata: shn_MM: new Shan locale
1533 [13805] localedata: ru_RU: currency should use ',' as radix point
1534 [13953] localedata: km_KH: locale update
1535 [13994] localedata: mjw_IN: new locale
1536 [14121] build: make writes .mo files in po directory
1537 [14333] libc: Fix the race between atexit() and exit()
1538 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1539 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1541 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1542 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1543 width Latin characters
1544 [15332] localedata: es_CU: locale update
1545 [15436] stdio: Don't close or flush stdio streams on abort
1546 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1548 [16148] localedata: ca_ES: incorrect thousands separator
1549 [16750] dynamic-link: ldd should not try to execute the binaries
1551 [16777] localedata: pl_PL: incorrect thousands separator in locale
1552 [16905] localedata: hanzi: new collation
1553 [17563] localedata: cmn_TW: add hanzi collation
1554 [17750] localedata: wrong collation order of diacritics in most locales
1555 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1557 [17956] build: Build fails on missing definitions from header file
1558 nss/nss.h when Mozilla NSS is used for cryptography
1559 [18203] libc: realpath() does not handle unreachable paths correctly
1560 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1561 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1562 [18822] libc: Internal functions are called via PLT
1563 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1564 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1565 [19574] libc: glibc should support building static PIE binaries
1566 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1568 [19971] glob: glob: Do not skip entries with zero d_ino values
1569 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1570 [20008] localedata: km_KH: convert to translit_neutral
1571 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1572 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1573 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1574 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1575 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
1577 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1578 they're set, wrong errors returned by gaih_inet when lookup functions
1580 [20756] localedata: [PATCH] Use Unicode wise thousands separator
1581 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1583 [20952] localedata: yuw_PG: new locale
1584 [21084] localedata: charmaps/IBM858: new codepage
1585 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1586 [21242] libc: assert gives pedantic warning in old gcc versions
1587 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1588 __regcall calling convention
1589 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1590 [21326] libc: C99 functions are not declared for C++11 and later if
1591 _GNU_SOURCE is not predefined by g++
1592 [21457] libc: sys/ucontext.h namespace
1593 [21530] libc: tmpfile() should be implemented using O_TMPFILE
1594 [21660] math: GCC fails to compile a formula with tgmath.h
1595 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1596 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1597 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1598 [21684] math: tgmath.h handling of complex integers
1599 [21685] math: tgmath.h handling of bit-fields
1600 [21686] math: tgmath.h handling of __int128
1601 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1603 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1605 [21750] localedata: column width of characters incompatible with classical
1607 [21754] malloc: malloc: Perform as little work as possible after heap
1608 consistency check failures
1609 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1610 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1611 [21791] string: Unused XXX_chk_XXX functions in libc.a
1612 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1614 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1616 [21845] localedata: Added new Locale bho_NP
1617 [21853] localedata: Fix abday Which looks same as day in zh_SG
1618 [21854] localedata: Added New Locale en_SC
1619 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1620 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1621 _dl_runtime_resolve_avx_slow
1622 [21885] network: getaddrinfo: gethosts does not release resolver context
1623 on memory allocation failure
1624 [21899] libc: XPG4.2 sigaction namespace
1625 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1627 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1629 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1630 errno value, causing getaddrinfo to fail
1631 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1632 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1633 instead of EAI_NODATA
1634 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1635 constant PTRACE_SEIZE_DEVEL
1636 [21930] math: C-only gcc builtins used in <math.h> isinf
1637 [21932] network: Unpaired __resolv_context_get in generic get*_r
1639 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1640 [21944] libc: sigval namespace
1641 [21951] localedata: Update hanzi collation by stroke
1642 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
1643 sysdeps/x86_64/fpu/e_expf.S
1644 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1645 allocation in syscall loops)
1646 [21959] localedata: Fix Country name for xh_ZA
1647 [21960] localedata: Fix abmon for bem_ZM
1648 [21966] math: AVX2 mathvec functions use FMA without checking
1649 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1650 [21971] localedata: Added New Locale for mfe_MU
1651 [21972] libc: assert macro requires operator== (int) for its argument type
1652 [21973] math: [sparc] libm missing sqrtl compat symbol
1653 [21974] libc: Remove __bb_init_func and __bb_exit_func
1654 [21982] string: stratcliff.c: error: assuming signed overflow does not
1656 [21986] stdio: __guess_grouping is called incorrectly
1657 [21987] math: [sparc32] wrong bits/long-double.h installed
1658 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1660 [22022] localedata: Missing country_name for mni_IN
1661 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1663 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1665 [22026] locale: iconv_open: heap overflow on gconv_init failure
1666 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1667 [22035] math: [m68k] bits/math-inline.h macro namespace
1668 [22038] localedata: Fix abbreviated weeks and months for Somali
1669 [22044] localedata: Remove redundant data for Limburgish Language
1670 [22050] malloc: Linking with -lmcheck does not hook
1671 __malloc_initialize_hook correctly
1672 [22051] libc: zero terminator in the middle of glibc's .eh_frame
1673 [22052] malloc: malloc failed to compile with GCC 7 and -O3
1674 [22070] localedata: charmaps/UTF-8: wcwidth for
1675 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1676 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1677 Jungseong and Jongseong) should be 0
1678 [22078] nss: nss_files performance issue in multi mode
1679 [22082] math: bits/math-finite.h exp10 condition
1680 [22086] libc: pcprofiledump incorrect cross-endian condition
1681 [22093] dynamic-link: ld.so no longer searches in .../x86_64
1682 [22095] network: Name server address allocation memory leak in resolv.conf
1684 [22096] network: __resolv_conf_attach can incorrectly free passed conf
1686 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1687 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1689 [22111] malloc: malloc: per thread cache is not returned when thread exits
1690 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1691 [22134] libc: [linux] implement fexecve with execveat
1692 [22142] libc: [powerpc] printf oupts a wrong value of DBL_MAX on ppc64 and
1694 [22145] libc: ttyname() gives up too early in the face of namespaces
1695 [22146] math: C++ build issue with float128 on x86_64
1696 [22153] nptl: nptl: save error code before process termination
1697 [22156] libc: [hppa,ia64,microblaze] Executable stack default
1698 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1699 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1700 [22165] libc: [hppa] Text relocations in libc.so
1701 [22180] libc: destructor registered via __cxa_atexit is called twice
1702 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1703 symlinks") cause "make" segfaults
1704 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1706 [22207] libc: FAIL: stdlib/test-atexit-race
1707 [22225] math: nearbyint arithmetic moved before feholdexcept
1708 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1709 [22235] math: iscanonical in C++ and float128
1710 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1711 the svid compat wrapper
1712 [22244] math: ynf and yn are wrong without the svid compat wrapper
1713 [22273] libc: Improper assert in Linux posix_spawn implementation
1714 [22284] libc: -pg -pie doesn't work
1715 [22292] locale: localedef exits with error 4 when it should be error 1
1716 [22294] locale: Allow "" for int_currency_symbol definition in locales.
1717 [22295] locale: Don't warn on non-symbolic characters in locale sources in
1719 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1720 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1722 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1723 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1724 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1725 [22322] libc: [mips64] wrong bits/long-double.h installed
1726 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1727 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1729 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1730 [22343] malloc: Integer overflow in posix_memalign
1731 [22347] libc: getrandom() returns the number of bytes that were copied to
1732 the buffer even though the comments say "Return 0 on success and -1 on
1734 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1735 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1737 [22370] dynamic-link: Incorrect note padding check
1738 [22375] libc: malloc returns pointer from tcache_get when should return
1739 NULL (CVE-2017-17426)
1740 [22377] math: iseqsig, float128 and C++
1741 [22382] localedata: Error in tpi_PG locale
1742 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1743 inside the ASCII printable range
1744 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1746 [22403] localedata: Slash needs escaping in some locales
1747 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1748 [22409] network: res_hnok does not accept some host names used on the
1750 [22412] network: res_dnok, res_hnok should perform syntax checks
1751 [22413] network: ns_name_pton ignores syntactically invalid trailing
1753 [22415] stdio: setvbuf can lead to invalid free/segfault
1754 [22432] build: Non-deterministic build
1755 [22439] malloc: malloc_info should compute summary statistics for all sub-
1757 [22442] network: if_nametoindex could report index for the wrong
1758 networking interface
1759 [22446] build: aliasing violation calling readlink in handle_request
1760 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
1761 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
1762 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
1763 __nscd_hash/__nss_hash
1764 [22463] network: p_secstodate overflow handling
1765 [22469] localedata: pl_PL LC_COLLATE does not use i18n
1766 [22478] libc: sigwait can fail with EINTR
1767 [22505] libc: ldconfig processes include directive in locale-specific
1769 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
1770 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
1771 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
1772 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
1773 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
1774 [22534] localedata: Collation rules for Serbian and Bosnian should be the
1775 same as for Croatian
1776 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
1777 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
1778 [22577] libc: missing newline after "cannot allocate TLS data structures
1780 [22588] manual: manual/conf.texi: missing underscore in front of
1782 [22593] math: nextafter and nexttoward are declared with const attribute
1783 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
1784 [22603] string: ia64 memchr overflows internal pointer check
1785 [22605] libc: SH clone does not set the exit code correctly
1786 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
1788 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
1789 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
1790 modified in case of success
1791 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
1792 [22615] manual: manual: ambiguous wording about errno value in case of
1794 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
1796 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
1797 binaries or if /proc is not mounted (CVE-2017-16997)
1798 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
1799 [22630] build: $(no-pie-ldflag) is no longer effective
1800 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
1801 [22635] nptl: pthread_self returns NULL before libpthread is loaded
1802 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
1803 [22637] nptl: guard size is subtracted from thread stack size instead of
1805 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
1806 [22657] localedata: hu_HU: Avoid double space in date
1807 [22660] math: fmax, fmin sNaN handling on alpha
1808 [22664] libc: New warning of GCC8
1809 [22665] math: alpha: ceil and floor raise inexact exceptions
1810 [22666] math: alpha: trunc raise inexact exceptions
1811 [22667] libc: makecontext lacks stack alignment on i386
1812 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
1813 [22679] libc: getcwd(3) can succeed without returning an absolute path
1815 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
1816 elision and tunables
1817 [22687] math: [powerpc-nofpu] complex long double functions spurious
1819 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
1820 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
1821 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
1823 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
1824 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
1826 [22701] nis: Incomplete removal of libnsl
1827 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
1828 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
1829 [22715] dynamic-link: FAIL: elf/tst-audit10
1830 [22719] libc: Backtrace tests fail on hppa
1831 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
1832 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
1833 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
1834 before the first call to crypt_r () in crypt/badsalttest.c
1841 * A per-thread cache has been added to malloc. Access to the cache requires
1842 no locks and therefore significantly accelerates the fast path to allocate
1843 and free small amounts of memory. Refilling an empty cache requires locking
1844 the underlying arena. Performance measurements show significant gains in a
1845 wide variety of user workloads. Workloads were captured using a special
1846 instrumented malloc and analyzed with a malloc simulator. Contributed by
1847 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
1849 * Unicode 10.0.0 Support: Character encoding, character type info, and
1850 transliteration tables are all updated to Unicode 10.0.0, using
1851 generator scripts contributed by Mike FABIAN (Red Hat).
1852 These updates cause user visible changes, especially the changes in
1853 wcwidth for many emoji characters cause problems when emoji sequences
1854 are rendered with pango, see for example:
1855 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
1857 * Collation of Hungarian has been overhauled and is now consistent with "The
1858 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
1861 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
1863 - The GNU C Library will now detect when /etc/resolv.conf has been
1864 modified and reload the changed configuration. The new resolver option
1865 “no-reload” (RES_NORELOAD) disables this behavior.
1867 - The GNU C Library now supports an arbitrary number of search domains
1868 (configured using the “search” directive in /etc/resolv.conf);
1869 previously, there was a hard limit of six domains. For backward
1870 compatibility, applications that directly modify the ‘_res’ global
1871 object are still limited to six search domains.
1873 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
1874 Library will now randomly pick a name server from the configuration as a
1875 starting point. (Previously, the second name server was always used.)
1877 * The tunables feature is now enabled by default. This allows users to tweak
1878 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
1880 * New function reallocarray, which resizes an allocated block (like realloc)
1881 to the product of two sizes, with a guaranteed clean failure upon integer
1882 overflow in the multiplication. Originally from OpenBSD, contributed by
1883 Dennis Wölfing and Rüdiger Sonderfeld.
1885 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
1886 These are extended versions of preadv and pwritev, respectively, taking an
1887 additional flags argument. The set of supported flags depends on the
1888 running kernel; full support currently requires kernel 4.7 or later.
1890 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
1891 create a new session ID for the spawned process. This feature is
1892 scheduled to be added to the next major revision of POSIX; for the time
1893 being, it is available under _GNU_SOURCE.
1895 * errno.h is now safe to use from C-preprocessed assembly language on all
1896 supported operating systems. In this context, it will only define the
1897 Exxxx constants, as preprocessor macros expanding to integer literals.
1899 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
1900 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
1901 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
1902 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
1904 To compile programs that use this feature, the compiler must support
1905 128-bit floating point with the type name _Float128 (as defined by TS
1906 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
1907 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
1908 must be defined to make the new interfaces visible.
1910 The new functions and macros correspond to those present for other
1911 floating-point types (except for a few obsolescent interfaces not
1912 supported for the new type), with F128 or f128 suffixes; for example,
1913 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
1914 printf or scanf formats for the new type; the strfromf128 and strtof128
1915 interfaces should be used instead.
1917 Deprecated and removed features, and other changes affecting compatibility:
1919 * The synchronization that pthread_spin_unlock performs has been changed to
1920 now be equivalent to a C11 atomic store with release memory order to the
1921 spin lock's memory location. Previously, several (but not all)
1922 architectures used stronger synchronization (e.g., containing what is
1923 often called a full barrier). This change can improve performance, but
1924 may affect odd fringe uses of spin locks that depend on the previous
1925 behavior (e.g., using spin locks as atomic variables to try to implement
1926 Dekker's mutual exclusion algorithm).
1928 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
1931 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
1932 will only be built and installed when the GNU C Library is configured with
1933 --enable-obsolete-rpc. This allows alternative RPC implementations, such
1934 as TIRPC or rpcsvc-proto, to be used.
1936 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
1937 libnss_compat, are deprecated, and will not be built or installed by
1940 The NIS(+) support library, libnsl, is also deprecated. By default, a
1941 compatibility shared library will be built and installed, but not headers
1942 or development libraries. Only a few NIS-related programs require this
1943 library. (In particular, the GNU C Library has never required programs
1944 that use 'gethostbyname' to be linked with libnsl.)
1946 Replacement implementations based on TIRPC, which additionally support
1947 IPv6, are available from <https://github.com/thkukuk/>. The configure
1948 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
1949 name service modules, to be built and installed.
1951 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
1952 support is enabled, the configured recursive resolver must support EDNS.
1953 (Responding to EDNS-enabled queries with responses which are not
1954 EDNS-enabled is fine, but FORMERR responses are not.)
1956 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
1957 servers have not supported this opcode for a long time.
1959 * The _res_opcodes variable has been removed from libresolv. It had been
1960 exported by accident.
1962 * <string.h> no longer includes inline versions of any string functions,
1963 as this kind of optimization is better done by the compiler. The macros
1964 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
1966 * The nonstandard header <xlocale.h> has been removed. Most programs should
1967 use <locale.h> instead. If you have a specific need for the definition of
1968 locale_t with no other declarations, please contact
1969 libc-alpha@sourceware.org and explain.
1971 * The obsolete header <sys/ultrasound.h> has been removed.
1973 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
1975 * The obsolete function cfree has been removed. Applications should use
1978 * The stack_t type no longer has the name struct sigaltstack. This changes
1979 the C++ name mangling for interfaces involving this type.
1981 * The ucontext_t type no longer has the name struct ucontext. This changes
1982 the C++ name mangling for interfaces involving this type.
1984 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
1985 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
1986 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
1987 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
1988 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
1989 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
1990 fpregset_t type no longer has the name struct fpu. This changes the C++
1991 name mangling for interfaces involving those types.
1993 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
1994 synced with the kernel:
1996 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
1997 are not supported on this architecture and have been removed.
1999 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2000 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2001 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2003 Programs that assume the GET/SETREGS ptrace requests are universally
2004 available will now fail to build, instead of malfunctioning at runtime.
2006 Changes to build and runtime requirements:
2008 * Linux kernel 3.2 or later is required at runtime, on all architectures
2009 supported by that kernel. (This is a change from version 2.25 only for
2012 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2014 * On most architectures, GCC 4.9 or later is required to build the GNU C
2015 Library. On powerpc64le, GCC 6.2 or later is required.
2017 Older GCC versions and non-GNU compilers are still supported when
2018 compiling programs that use the GNU C Library. (We do not know exactly
2019 how old, and some GNU extensions to C may be _de facto_ required. If you
2020 are interested in helping us make this statement less vague, please
2021 contact libc-alpha@sourceware.org.)
2023 Security related changes:
2025 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2026 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2028 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2029 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2031 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2032 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2035 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2036 fixed (CVE-2017-12133).
2038 The following bugs are resolved with this release:
2040 [984] network: Respond to changed resolv.conf in gethostbyname
2041 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2042 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2044 [12189] libc: __stack_chk_fail should not attempt a backtrace
2046 [14096] time: Race condition on timezone/tst-timezone.out
2047 [14172] localedata: az_IR: new locale
2048 [14995] build: glibc fails to build if gold is the default linker, even if
2050 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2051 [16637] network: inet_pton function is accepting IPv6 with bad format
2052 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2053 x86 and other generic code
2054 [16875] localedata: ko_KR: fix lang_name
2055 [17225] localedata: ar_SY: localized month names for May and June are
2057 [17297] localedata: da_DK: wrong date_fmt string
2058 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2059 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2060 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2061 [19066] localedata: ar_SA abbreviated day and month names are in English
2062 [19569] network: resolv: Support an arbitrary number of search domains
2063 [19570] network: Implement random DNS server selection in the stub
2065 [19838] locale: localedef fails on PA-RISC
2066 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2067 order of 0D36 and 0D37
2068 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2070 [20098] libc: FAIL: debug/backtrace-tst on hppa
2071 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2073 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2075 [20313] localedata: Update locale data to Unicode 9.0
2076 [20424] manual: Document how to provide a malloc replacement
2077 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2079 [20686] locale: Add el_GR@euro to SUPPORTED.
2080 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2081 failures consistently
2082 [21015] dynamic-link: Document and fix --enable-bind-now
2083 [21016] nptl: pthread_cond support is broken on hppa
2084 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2085 frame-pointer on i386
2086 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2088 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2089 [21088] libc: Build fails with --enable-static-nss
2090 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2091 generic c code is used
2092 [21109] libc: Tunables broken on big-endian
2093 [21112] math: powf has large ulp errors with base close to 1 and exponent
2095 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2097 [21120] malloc: glibc malloc is incompatible with GCC 7
2098 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2100 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2101 (-0.0) when linking with -lieee
2102 [21171] math: log10, log2 and lgamma return incorrect results
2103 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2104 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2105 [21207] localedata: ce_RU: update weekdays from CLDR
2106 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2107 [21217] localedata: Update months from CLDR-31
2108 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2109 [21243] libc: support_delete_temp_file should issue warning for failed
2111 [21244] libc: support resolv_test_start() socket fd close should be
2113 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2114 new posix_spawn implementation
2115 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2116 leads to lower CPU frequency
2117 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2118 [21261] libc: [sparc64] bits/setjmp.h namespace
2119 [21267] network: [mips] bits/socket.h IOC* namespace
2120 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2121 [21270] libc: mmap64 silently truncates large offset values
2122 [21275] libc: posix_spawn always crashes on ia64 now
2123 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2124 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2125 [21289] libc: Incorrect declaration for 32-bit platforms with
2126 _FILE_OFFSET_BITS=64 causes build error
2127 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2128 not support gethostbyname4_r
2129 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2131 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2133 [21340] libc: Support POSIX_SPAWN_SETSID
2134 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2135 [21359] network: ns_name_pack needs additional byte in destination buffer
2136 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2137 against fragmentation attacks (CVE-2017-12132)
2138 [21369] network: resolv: Remove EDNS fallback
2139 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2141 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2142 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2143 [21393] stdio: Missing dup3 error check in freopen, freopen64
2144 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2145 [21399] localedata: Bad description for U00EC in
2146 localedata/charmaps/CP1254
2147 [21411] malloc: realloc documentation error
2148 [21426] network: sys/socket.h uio.h namespace
2149 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2150 [21445] libc: signal.h bsd_signal namespace
2151 [21455] network: Network headers stdint.h namespace
2152 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2154 [21475] network: resolv: Overlong search path is truncated mid-label
2155 [21511] libc: sigstack namespace
2156 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2157 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2158 bits/syscall.h: No such file or directory
2159 [21517] libc: struct sigaltstack namespace
2160 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2161 [21533] localedata: Update locale data to Unicode 10.0
2163 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2164 junk at end of line, first unrecognized character is `@'
2165 [21538] libc: SIG_HOLD missing for XPG4
2166 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2167 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2168 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2169 [21543] libc: sigevent namespace
2170 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2171 size for general purpose registers in mcontext_t structure
2172 [21550] libc: sigwait namespace
2173 [21552] libc: XPG4 bsd_signal namespace
2174 [21554] libc: sigpause namespace
2175 [21560] libc: sys/wait.h signal.h namespace
2176 [21561] libc: waitid namespace
2177 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2178 '/usr/include/stdlib.h': Permission denied
2179 [21575] libc: sys/wait.h missing struct rusage definition
2180 [21584] libc: sigaltstack etc namespace
2181 [21597] libc: siginterrupt namespace
2182 [21607] math: hppa: FAIL: math/test-tgmath
2183 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2185 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2186 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2187 stack and heap (CVE-2017-1000366)
2188 [21625] libc: wait3 namespace
2189 [21654] nss: Incorrect pointer alignment in NSS group merge result
2191 [21657] network: Parse interface zone id for node-local multicast
2192 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2194 [21666] libc: .symver is used on common symbol
2195 [21668] network: resolv: res_init cross-thread broadcast introduces race
2197 [21687] math: tgmath.h totalorder, totalordermag return type
2198 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2200 [21696] libc: Incorrect assumption of of __cpu_mask in
2201 posix/sched_cpucount.c
2202 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2203 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2205 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2206 leading to relocation crash
2207 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2208 `resolv_conf_matches (resp, conf)' failed.
2209 [21710] localedata: Added Samoan language locale for Samoa
2210 [21711] localedata: Pashto yesstr/nostr locale are missing
2211 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2212 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2213 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2214 [21723] localedata: yesstr/nostr missing for Chinese language locale
2215 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2217 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2219 [21728] localedata: New Locale for Tongan language
2220 [21729] localedata: incorrect LC_NAME fields for hi_IN
2221 [21733] localedata: yesstr and nostr are missing for zh_HK
2222 [21734] localedata: Missing yesstr and nostr are for kw_GB
2223 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2224 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2225 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2226 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2228 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2230 [21749] localedata: Wrong abbreviated day name (“abday”) for
2232 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2233 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2234 [21759] localedata: missing yesstr and nostr for Tigrinya
2235 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2236 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2237 [21767] localedata: Missing Bislama locales
2238 [21768] localedata: Missing yesstr and nostr for aa_ET
2239 [21770] localedata: Missing Field in li_NL
2240 [21778] nptl: Robust mutex may deadlock
2241 [21779] libc: MicroBlaze segfaults when loading libpthread
2242 [21783] localedata: Fix int_select international_call_prefixes
2243 [21784] localedata: Inconsistency in country_isbn
2244 [21788] localedata: Missing Country Postal Abbreviations
2245 [21794] localedata: Added-country_isbn-for-Italy
2246 [21795] localedata: Add/Fix country_isbn for France
2247 [21796] localedata: Added country_isbn for Republic of Korea
2248 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2249 [21799] localedata: Added int_select international_call_prefixes
2250 [21801] localedata: Added int_select international_call_prefixes
2251 [21804] nptl: Double semicolon in thread-shared-types.h
2252 [21807] localedata: LC_ADDRESS fix for pap_CW
2253 [21808] localedata: Fix LC_ADDRESS for pap_AW
2254 [21821] localedata: Added country_name in mai_IN
2255 [21822] localedata: Fix LC_TIME for mai_IN
2256 [21823] localedata: missing yesstr, nostr for sa_IN
2257 [21825] localedata: Fix name_mrs for mag_IN
2258 [21828] localedata: 2.26 changelog should mention user visible changes
2260 [21835] localedata: Added Maithili language locale for Nepal
2261 [21838] localedata: Removed redundant data for the_NP
2262 [21839] localedata: Fix LC_MONETARY for ta_LK
2263 [21844] localedata: Fix Latin characters and Months Sequence.
2264 [21848] localedata: Fix mai_NP Title Name
2269 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2270 24731-2:2010, is supported to enable declarations of functions from that
2271 TR. Note that not all functions from that TR are supported by the GNU C
2274 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2275 18661-1:2014, is supported to enable declarations of functions and macros
2276 from that TS. Note that not all features from that TS are supported by
2279 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2280 18661-4:2015, is supported to enable declarations of functions and macros
2281 from that TS. Note that most features from that TS are not supported by
2284 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2285 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2286 Since the GNU C Library defaults to a much newer revision of POSIX, this
2287 will only affect programs that specifically request an old conformance
2288 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2289 see a change in the visible declarations, but a program compiled with
2290 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2293 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2294 defined by all multithreaded code, but glibc has not required this for
2297 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2298 means that in a future release, the macros “major”, “minor”, and “makedev”
2299 will only be available from <sys/sysmacros.h>.
2301 These macros are not part of POSIX nor XSI, and their names frequently
2302 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2303 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2304 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2307 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2308 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2309 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2311 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2312 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2313 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2314 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2315 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2316 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2317 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2318 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2319 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2320 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2321 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2324 * New <math.h> features are added from TS 18661-1:2014:
2326 - Signaling NaN macros: SNANF, SNAN, SNANL.
2328 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2329 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2330 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2332 - llogb functions: the llogb, llogbf and llogbl functions, and the
2333 FP_LLOGB0 and FP_LLOGBNAN macros.
2335 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2338 - Comparison macros: iseqsig.
2340 - Classification macros: iscanonical, issubnormal, iszero.
2342 - Total order functions: totalorder, totalorderf, totalorderl,
2343 totalordermag, totalordermagf, totalordermagl.
2345 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2347 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2348 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2350 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2351 are added to libc. They convert a floating-point number into string.
2353 * Most of glibc can now be built with the stack smashing protector enabled.
2354 It is recommended to build glibc with --enable-stack-protector=strong.
2355 Implemented by Nick Alcock (Oracle).
2357 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2358 intended to be used instead of memset() to erase sensitive data after use;
2359 the compiler will not optimize out calls to explicit_bzero even if they
2360 are "unnecessary" (in the sense that no _correct_ program can observe the
2361 effects of the memory clear).
2363 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2364 to float instead of double. This does not affect the ABI of any libraries
2365 that are part of the GNU C Library, but may affect the ABI of other
2366 libraries that use this type in their interfaces.
2368 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2369 float_t and double_t types are now defined to long double instead of float
2370 and double. These options are not the default, and this does not affect
2371 the ABI of any libraries that are part of the GNU C Library, but it may
2372 affect the ABI of other libraries that use this type in their interfaces,
2373 if they are compiled or used with those options.
2375 * The getentropy and getrandom functions, and the <sys/random.h> header file
2378 * The buffer size for byte-oriented stdio streams is now limited to 8192
2379 bytes by default. Previously, on Linux, the default buffer size on most
2380 file systems was 4096 bytes (and thus remains unchanged), except on
2381 network file systems, where the buffer size was unpredictable and could be
2382 as large as several megabytes.
2384 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2385 for the Linux quota interface which predates kernel version 2.4.22 has
2388 * The malloc_get_state and malloc_set_state functions have been removed.
2389 Already-existing binaries that dynamically link to these functions will
2390 get a hidden implementation in which malloc_get_state is a stub. As far
2391 as we know, these functions are used only by GNU Emacs and this change
2392 will not adversely affect already-built Emacs executables. Any undumped
2393 Emacs executables, which normally exist only during an Emacs build, should
2394 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2396 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2397 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2398 “no-ip6-dotint” had already been the default, and support for the
2399 “ip6-dotint” option was removed from the Internet in 2006.
2401 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2402 flag from <resolv.h> have been removed. The option relied on a
2403 backwards-incompatible DNS extension which was never deployed on the
2406 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2407 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2408 They were already unimplemented.
2410 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2411 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2412 removed again from the IETF name lookup interface specification in RFC
2413 2553. Applications should use getaddrinfo instead.
2415 * DNSSEC-related declarations and definitions have been removed from the
2416 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2417 decode the data part of DNSSEC record types. Previous versions of glibc
2418 only implemented minimal support for the previous version of DNSSEC, which
2419 is incompatible with the currently deployed version.
2421 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2422 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2423 <arpa/nameser.h> header file because the distinction between RR types and
2424 meta-RR types is not officially standardized, subject to revision, and
2425 thus not suitable for encoding in a macro.
2427 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2428 and rhook members of the res_state type in <resolv.h> have been removed.
2429 The glibc stub resolver did not support these hooks, but the header file
2430 did not reflect that.
2432 * For multi-arch support it is recommended to use a GCC which has
2433 been built with support for GNU indirect functions. This ensures
2434 that correct debugging information is generated for functions
2435 selected by IFUNC resolvers. This support can either be enabled by
2436 configuring GCC with '--enable-gnu-indirect-function', or by
2437 enabling it by default by setting 'default_gnu_indirect_function'
2438 variable for a particular architecture in the GCC source file
2441 * GDB pretty printers have been added for mutex and condition variable
2442 structures in POSIX Threads. When installed and loaded in gdb these pretty
2443 printers show various pthread variables in human-readable form when read
2444 using the 'print' or 'display' commands in gdb.
2446 * Tunables feature added to allow tweaking of the runtime for an application
2447 program. This feature can be enabled with the '--enable-tunables' configure
2448 flag. The GNU C Library manual has details on usage and README.tunables has
2449 instructions on adding new tunables to the library.
2451 * A new version of condition variables functions have been implemented in
2452 the NPTL implementation of POSIX Threads to provide stronger ordering
2455 * A new version of pthread_rwlock functions have been implemented to use a more
2456 scalable algorithm primarily through not using a critical section anymore to
2459 Security related changes:
2461 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2462 have been created with makecontext could fail to terminate due to a
2463 missing .cantunwind annotation. This has been observed to lead to a hang
2464 (denial of service) in some Go applications compiled with gccgo. Reported
2465 by Andreas Schwab. (CVE-2016-6323)
2467 * The DNS stub resolver functions would crash due to a NULL pointer
2468 dereference when processing a query with a valid DNS question type which
2469 was used internally in the implementation. The stub resolver now uses a
2470 question type which is outside the range of valid question type values.
2473 The following bugs are resolved with this release:
2475 [4099] stdio: Overly agressive caching by stream i/o functions.
2476 [7065] build: Support building glibc with -fstack-protector or -fstack-
2478 [9842] localedata: en_CA: incorrect date format
2479 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2480 before it started waiting
2481 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2482 [15765] nptl: sem_open is wrongly a cancellation point
2483 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2484 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2486 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2487 library linked with pthread
2488 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2489 "FIXME: Ingo" issue)
2490 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2491 [17252] libc: getrandom and getentropy syscall
2492 [17730] malloc: thread-local storage is sometimes improperly free()'d
2493 after being __libc_memalign()'d
2494 [18241] stdio: failed fseek on memstream does not set errno and can fail
2496 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2498 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2499 PTHREAD_PRIO_INHERIT mutex on ARM
2500 [18784] network: res_query and related function crash for special record
2501 type queries (CVE-2015-5180)
2502 [19380] math: strtod does not raise "inexact"
2503 [19387] string: Integer overflow in memchr
2504 [19390] string: Integer overflow in strncat
2505 [19398] build: linknamespace tests fail with massively parallel build
2506 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2508 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2509 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2510 [19514] libc: [PATCH] Fix spelling errors in spelling
2511 "implement"/"implementation" in several places
2512 [19582] network: Deprecate RES_USE_INET6
2513 [19673] manual: clog10 docs appear to be erroneous
2514 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2515 causes a segmentation fault
2516 [19826] libc: invalid pointer returned from __tls_get_addr with static
2518 [20016] network: resolv: Remove hooks support from the API
2519 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2521 [20033] math: [x86_64] vectorized math function don't call the __finite
2523 [20116] nptl: use after free in pthread_create
2524 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2525 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2527 [20311] nptl: please install proc_service.h
2528 [20366] libc: Compilation errors in installed headers in strict-compliance
2530 [20370] malloc: malloc: Arena free list management is still racy
2531 (incorrect fix in bug 19243)
2532 [20386] libc: assert (X = 0) does not result in GCC warning
2533 [20432] malloc: malloc: Minimize interface required for interposition
2534 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2535 in _Unwind_Backtrace (CVE-2016-6323)
2536 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2537 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2539 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2540 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2541 [20477] network: resolv: incorrect double-checked locking related to
2543 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2545 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2547 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2548 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2549 cause transition penalty
2550 [20517] math: sparcv9 missing fdiml compat symbol
2551 [20524] manual: strverscmp is inconsistent
2552 [20525] libc: <sys/quota.h> should be based on kernel headers
2553 [20539] math: GCC 7 -static -lm fails to link at -O3
2554 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2556 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2558 [20591] network: Remove obsolete DNSSEC support
2559 [20592] network: DNS resource record type classification macros in
2560 <arpa/nameser.h> are incorrect
2561 [20593] network: Update DNS RR type definitions
2562 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2563 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2565 [20629] network: libresolv: Remove support for bitstring labels
2567 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2568 assertion: "maxidx >= 2"
2569 [20660] math: [arm] Use VSQRT
2570 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2571 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2572 [20689] libc: Test for FMA should also check for AVX.
2573 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2574 [20715] math: iszero macro breaks existing code
2575 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2576 [20728] libc: powerpc: Missing TOC stub in clone
2577 [20729] build: glibc-2.24 fails to build for i486 with -Os
2578 [20750] build: Build fails with default PIE enabled gcc-6.x
2579 [20768] math: [alpha] sqrt fegetenv namespace
2580 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2582 [20787] math: float_t is defined as float incorrectly on x86_64 even if
2583 __FLT_EVAL_METHOD__ is 2
2584 [20790] network: rpcgen buffer overrun in get_prog_declaration
2585 [20822] nptl: race condition in __lll_unlock_elision on powerpc
2586 [20829] libc: crypt snprintf namespace
2587 [20847] libc: tst-vfork3 failure
2588 [20855] math: Default bits/mathdef.h has inappropriate float_t
2589 [20859] math: [sh4] FP_ILOGB0 invalid
2590 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2591 U+20AC), not same as GBK
2592 [20915] dynamic-link: global-dynamic TLS broken on aarch64
2593 [20916] math: pow handling of sNaN arguments
2594 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2595 [20919] math: Bad pow (qNaN, 0) result with -lieee
2596 [20940] math: hypot sNaN handling
2597 [20947] math: fmax, fmin sNaN handling
2598 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2599 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2601 [20971] string: powerpc64/power7 memchr overflows internal pointer check
2602 [20973] nptl: robust mutexes: Lost wake-ups
2603 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2604 [20978] nis: strlen on null pointer in nss_nisplus
2605 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2607 [21014] string: i686 memchr overflows internal pointer check
2608 [21019] libc: [mips] n32 lseek incorrect on overflow
2609 [21022] libc: [microblaze] __backtrace get_frame_size namespace
2610 [21026] libc: [MIPS] readahead syscall is broken on n64
2611 [21028] math: Fallback fesetexceptflag should always succeed
2612 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2613 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2615 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2616 [21061] librt: [microblaze] librt lost clock_* exports
2617 [21073] libc: tunables: insecure environment variables passed to
2618 subprocesses with AT_SECURE
2619 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2623 * The minimum Linux kernel version that this version of the GNU C Library
2624 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2625 kernel version 2.6.32 or later suffices (on architectures that already
2626 required kernel versions more recent than 3.2, those requirements remain
2627 unchanged). Linux 3.2 or later kernel headers are required on all
2630 * The pap_AN locale has been deleted. This has been deprecated for a long
2631 time. It has been replaced by pap_AW & pap_CW, both of which have long
2632 been included in previous releases.
2634 * The readdir_r and readdir64_r functions have been deprecated. It is
2635 recommended to use readdir and readdir64 instead.
2637 * The type “union wait” has been removed. It was deprecated in the early
2638 1990s and never part of POSIX. Application code should use the int type
2639 instead of “union wait”.
2641 * A new NSS action is added to facilitate large distributed system
2642 administration. The action, MERGE, allows remote user stores like LDAP
2643 to be merged into local user stores like /etc/groups in order to provide
2644 easy to use, updated, and managed sets of merged credentials. The new
2645 action can be used by configuring it in /etc/nsswitch.conf:
2646 group: files [SUCCESS=merge] nis
2647 Implemented by Stephen Gallagher (Red Hat).
2649 * The deprecated __malloc_initialize_hook variable has been removed from the
2652 * The long unused localedef --old-style option has been removed. It hasn't
2653 done anything in over 16 years. Scripts using this option can safely
2656 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2657 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
2658 return the next representable value in the direction of positive infinity
2659 and the nextdown functions return the next representable value in the
2660 direction of negative infinity. These are currently enabled as GNU
2663 Security related changes:
2665 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
2666 could result in a stack overflow when getnetbyname was called with an
2667 overly long name. (CVE-2016-3075)
2669 * Previously, getaddrinfo copied large amounts of address data to the stack,
2670 even after the fix for CVE-2013-4458 has been applied, potentially
2671 resulting in a stack overflow. getaddrinfo now uses a heap allocation
2672 instead. Reported by Michael Petlan. (CVE-2016-3706)
2674 * The glob function suffered from a stack-based buffer overflow when it was
2675 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2676 Reported by Alexander Cherepanov. (CVE-2016-1234)
2678 * The Sun RPC UDP client could exhaust all available stack space when
2679 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
2680 alloca plugin for GCC. (CVE-2016-4429)
2682 * The IPv6 name server management code in libresolv could result in a memory
2683 leak for each thread which is created, performs a failing naming lookup,
2684 and exits. Over time, this could result in a denial of service due to
2685 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
2687 The following bugs are resolved with this release:
2689 [1170] localedata: ne_NP: update Nepali locale definition file
2690 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2692 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2693 [6796] math: fdim() does not set errno on overflow
2694 [10354] libc: posix_spawn should use vfork() in more cases than presently
2695 [11213] localedata: localedata: add copyright disclaimer to locale files
2696 [12143] localedata: chr_US: new Cherokee locale
2697 [12450] localedata: sgs_LT: new locale
2698 [12676] localedata: ln_CD: new locale
2699 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2701 [13304] math: fma, fmaf, fmal produce wrong results
2702 [14259] build: --localedir arg to configure is ignored
2703 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2704 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2705 [14934] localedata: es_CL: wrong first weekday chilean locale
2706 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2708 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2710 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2711 [15368] nptl: raise() is not async-signal-safe
2712 [15479] math: ceil, floor, round and trunc raise inexact exception
2713 [15578] localedata: kk_KZ: various updates
2714 [16003] localedata: pap_AN: punt old locale
2715 [16137] localedata: iw_IL: punt old locale
2716 [16190] localedata: eo: new esperanto locale
2717 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2718 [16742] malloc: race condition: pthread_atfork() called before first
2719 malloc() results in unexpected locking behaviour/deadlocks
2720 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2722 [16983] localedata: postal_fmt does not allow %l and %n modifiers
2723 [17565] localedata: pt_PT: wrong (work-)week start
2724 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2725 [17950] build: Build fails with -msse
2726 [18205] localedata: be_BY*: wrong first_weekday and first_workday
2727 [18433] libc: posix_spawn does not return correctly upon failure to
2729 [18453] localedata: charmaps/IBM875: incorrect codes
2730 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2732 [18896] localedata: he_IL: improvements for currency
2733 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2734 Romanian locale data
2735 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2737 [19056] libc: Deprecate readdir_r
2738 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2740 [19198] localedata: nl_NL: small improvements for Dutch locales
2741 [19257] network: Per-thread memory leak in __res_vinit with IPv6
2742 nameservers (CVE-2016-5417)
2743 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2745 [19400] locale: Language missing in "iso-639.def", trivial fix in
2747 [19431] malloc: Deadlock between fflush, getdelim, and fork
2748 [19505] libc: Incorrect file descriptor validity checks in
2749 posix_spawn_file_actions_add{open,close,dup2}
2750 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2751 when using RTLD_NEXT
2752 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2753 `intl/{gettextP,loadinfo}.h'
2754 [19534] libc: execle, execlp may use malloc
2755 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
2756 [19573] network: res_nclose and __res_maybe_init disagree about name
2757 server initialization, breaking Hesiod
2758 [19575] localedata: Status of GB18030 tables
2759 [19581] localedata: sr_* date_fmt string contains additional newline
2760 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
2762 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
2763 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
2764 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
2765 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
2767 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
2769 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
2771 [19610] dynamic-link: ldconfig -X removes stale symbolic links
2772 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
2773 [19633] locale: strfmon_l applies global locale to number formatting
2774 [19642] network: Memory leak in getnameinfo
2775 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
2776 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
2778 [19654] math: [x86_64] Need testcase for BZ #19590 fix
2779 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
2781 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
2782 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
2784 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
2786 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
2788 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
2789 pointers and lengths in error-case.
2790 [19727] locale: Converting from/to UTF-xx with iconv() does not always
2791 report errors on UTF-16 surrogates values.
2792 [19755] nscd: nscd assertion failure in gc
2793 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
2794 [19759] libc: mempcpy shouldn't be inlined
2795 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
2796 [19765] libc: s390 needs an optimized mempcpy
2797 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
2798 NAME_MAX limit assumption (CVE-2016-1234)
2799 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
2800 [19787] network: Missing and incorrect truncation checks in getnameinfo
2801 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
2803 [19791] network: Assertion failure in res_query.c with un-connectable name
2805 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
2806 [19822] math: libm.so install clobbers old version
2807 [19825] network: resolv: send_vc can return uninitialized data in second
2808 response to getaddrinfo
2809 [19830] network: nss_dns: should check RDATA length against buffer length
2810 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
2811 confronted with A/AAAA records of invalid size
2812 [19837] nss: nss_db: No retries for some long lines with a larger buffer
2813 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
2814 [19853] stdio: Printing IBM long double in decimal with high precision is
2816 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
2817 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
2818 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
2820 [19865] network: Assertion failure or memory leak in
2821 _nss_dns_getcanonname_r
2822 [19868] network: nss_dns: netent code does not skip over non-PTR records
2823 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
2825 [19881] string: Improve x86-64 memset
2826 [19907] string: Incorrect memcpy tests
2827 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
2829 [19925] libc: termios.h XCASE namespace
2830 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
2831 [19929] libc: limits.h NL_NMAX namespace
2832 [19931] stdio: Memory leak in vfprintf
2833 [19957] libc: clone(CLONE_VM) access invalid parent memory
2834 [19963] localedata: en_IL: New locale
2835 [19989] stdio: stdio.h cuserid namespace
2836 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
2838 [19996] locale: langinfo.h nl_langinfo_l namespace
2839 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
2840 [20010] network: getaddrinfo: Stack overflow in hostent translation
2842 [20012] stdio: libio: fmemopen append mode failure
2843 [20014] stdio: stdio.h namespace for pre-threads POSIX
2844 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
2845 [20023] libc: fcntl.h timespec namespace
2846 [20024] math: [x86_64] vectorized sincos trashes the stack
2847 [20031] network: nss_hesiod: Heap overflow in get_txt_records
2848 [20041] time: sys/time.h timespec namespace
2849 [20043] libc: unistd.h missing cuserid for UNIX98 and before
2850 [20044] libc: unistd.h missing pthread_atfork for UNIX98
2851 [20051] libc: ttyslot in wrong header under wrong conditions
2852 [20054] libc: gethostname not declared for XPG4
2853 [20055] libc: termios.h missing tcgetsid for XPG4
2854 [20072] dynamic-link: x86 init_cpu_features is called twice in static
2856 [20073] libc: sys/stat.h fchmod namespace
2857 [20074] libc: stdlib.h rand_r namespace
2858 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
2859 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
2861 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
2862 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
2864 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
2865 [20119] libc: Wrong mask for processors level type from CPUID
2866 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
2867 AS not supporting AVX512
2868 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
2870 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
2871 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
2873 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
2874 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
2875 [20178] libc: posix_spawn{p} should not call exit
2876 [20191] stdio: libio: vtables hardening
2877 [20195] string: FMA4 detection requires CPUID execution with register
2879 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
2880 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
2882 [20212] math: acos (sNaN) returns sNaN
2883 [20213] math: asin (sNaN) returns sNaN
2884 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
2885 [20218] math: [i386] asinhl (sNaN) returns sNaN
2886 [20219] math: [i386] atanhl (sNaN) returns sNaN
2887 [20222] stdio: fopencookie: Mangle function pointers
2888 [20224] math: [i386] cbrtl (sNaN) returns sNaN
2889 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
2890 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
2892 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
2893 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
2894 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
2895 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
2896 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
2897 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
2898 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
2899 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
2900 [20240] math: modf (sNaN) returns sNaN
2901 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
2902 [20250] math: frexp (sNaN) returns sNaN
2903 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
2904 [20255] math: [i386] fdim, fdimf return with excess range and precision /
2906 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
2907 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
2908 subscript is below array bounds [-Werror=array-bounds]
2909 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
2910 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
2912 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
2913 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
2915 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
2916 "invalid" exceptions
2917 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
2918 [20316] localedata: id_ID: Februari instead of Pebruari
2919 [20327] string: POWER8 strcasecmp returns incorrect result
2920 [20347] math: Failure: Test: j0_downward (0xap+0)
2921 [20348] libc: FAIL: misc/tst-preadvwritev64
2922 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
2923 [20350] libc: There is no test for p{read,write}64
2924 [20357] math: Incorrect cos result for 1.5174239687223976
2925 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
2929 * Unicode 8.0.0 Support: Character encoding, character type info, and
2930 transliteration tables are all updated to Unicode 8.0.0, using new
2931 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
2932 These updates cause user visible changes, such as the fixes for bugs
2933 89, 16061, and 18568.
2935 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
2936 kernel-internal CPU set size. This means that requests that change the
2937 CPU affinity which failed before (for example, an all-ones CPU mask) will
2938 now succeed. Applications that need to determine the effective CPU
2939 affinities need to call sched_getaffinity or pthread_getaffinity_np after
2940 setting it because the kernel can adjust it (and the previous size check
2941 would not detect this in the majority of cases).
2943 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
2944 the following new symbols are used: fts64_children, fts64_close,
2945 fts64_open, fts64_read and fts64_set.
2947 * getaddrinfo now detects certain invalid responses on an internal netlink
2948 socket. If such responses are received, an affected process will
2949 terminate with an error message of "Unexpected error <number> on netlink
2950 descriptor <number>" or "Unexpected netlink response of size <number> on
2951 descriptor <number>". The most likely cause for these errors is a
2952 multi-threaded application which erroneously closes and reuses the netlink
2953 file descriptor while it is used by getaddrinfo.
2955 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
2956 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
2957 unnecessary serialization of memory allocation requests across threads.
2958 The defect is now corrected. Users should see a substantial increase in
2959 the concurent throughput of allocation requests for applications which
2960 trigger this bug. Affected applications typically create and
2961 destroy threads frequently. (Bug 19048 was reported and analyzed by
2964 * There is now a --disable-timezone-tools configure option for disabling the
2965 building and installing of the timezone related utilities (zic, zdump, and
2966 tzselect). This is useful for people who build the timezone data and code
2967 independent of the GNU C Library.
2969 * The obsolete header <regexp.h> has been removed. Programs that require
2970 this header must be updated to use <regex.h> instead.
2972 * The obsolete functions bdflush, create_module, get_kernel_syms,
2973 query_module and uselib are no longer available to newly linked binaries;
2974 the header <sys/kdaemon.h> has been removed. These functions and header
2975 were specific to systems using the Linux kernel and could not usefully be
2976 used with the GNU C Library on systems with version 2.6 or later of the
2979 * Optimized string, wcsmbs and memory functions for IBM z13.
2980 Implemented by Stefan Liebler.
2982 * Newly linked programs that define a variable called signgam will no longer
2983 have it set by the lgamma, lgammaf and lgammal functions. Programs that
2984 require signgam to be set by those functions must ensure that they use the
2985 variable provided by the GNU C Library and declared in <math.h>, without
2986 defining their own copy.
2988 * The minimum GCC version that can be used to build this version of the GNU
2989 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
2990 still be used to compile programs using the GNU C Library.
2992 Security related changes:
2994 * An out-of-bounds value in a broken-out struct tm argument to strftime no
2995 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
2997 * The LD_POINTER_GUARD environment variable can no longer be used to disable
2998 the pointer guard feature. It is always enabled. Previously,
2999 LD_POINTER_GUARD could be used to disable security hardening in binaries
3000 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3003 * An integer overflow in hcreate and hcreate_r could lead to an
3004 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3006 * The catopen function no longer has unbounded stack usage. Reported by
3007 Max. (CVE-2015-8779)
3009 * The nan, nanf and nanl functions no longer have unbounded stack usage
3010 depending on the length of the string passed as an argument to the
3011 functions. Reported by Joseph Myers. (CVE-2014-9761)
3013 * A stack-based buffer overflow was found in libresolv when invoked from
3014 libnss_dns, allowing specially crafted DNS responses to seize control
3015 of execution flow in the DNS client. The buffer overflow occurs in
3016 the functions send_dg (send datagram) and send_vc (send TCP) for the
3017 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3018 family. The use of AF_UNSPEC triggers the low-level resolver code to
3019 send out two parallel queries for A and AAAA. A mismanagement of the
3020 buffers used for those queries could result in the response of a query
3021 writing beyond the alloca allocated buffer created by
3022 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3023 the overflow. Thanks to the Google Security Team and Red Hat for
3024 reporting the security impact of this issue, and Robert Holiday of
3025 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3027 The following bugs are resolved with this release:
3029 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3030 [887] math: Math library function "logb" and "nextafter" inconsistent
3031 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3032 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3033 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3034 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3036 [4404] localedata: German translation of "Alarm clock" is misleading
3037 [6799] math: nextafter() and nexttoward() doen't set errno on
3038 overflow/underflow errors
3039 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3041 [10432] nis: _nss_nis_setnetgrent assertion failure
3042 [11460] libc: fts has no LFS support
3043 [12926] network: getaddrinfo()/make_request() may spin forever
3044 [13065] nptl: Race condition in pthread barriers
3045 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3046 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3048 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3049 [14912] libc: Rename non-installed bits/*.h headers
3050 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3051 [15367] math: Let gcc use __builtin_isinf
3052 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3053 [15421] math: lgamma wrongly sets signgam for ISO C
3054 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3055 FE_INVALID with argument out of range
3056 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3058 [15786] dynamic-link: ifunc resolver functions can smash function
3060 [15918] math: Unnecessary check for equality in hypotf()
3061 [16061] localedata: Review / update transliteration data
3062 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3064 [16141] time: strptime %z offset restriction
3065 [16171] math: drem should be alias of remainder
3066 [16296] math: fegetround is pure?
3067 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3068 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3070 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3071 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3073 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3074 "Exception "Inexact" set" on ppc32
3075 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3076 [16517] math: Missing underflow exception from tanf/tan/tanl
3077 [16519] math: Missing underflow exception from sinhf
3078 [16520] math: Missing underflow exception from tanhf
3079 [16521] math: Missing underflow exception from exp2
3080 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3082 [16734] stdio: fopen calls mmap to allocate its buffer
3083 [16961] math: nan function incorrect handling of bad sequences
3084 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3085 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3086 [16985] locale: localedef: confusing error message when opening output
3088 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3089 [17197] locale: Redundant shift character in iconv conversion output at
3091 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3092 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3093 [17250] dynamic-link: static linking breaks nss loading
3094 (getaddrinfo/getpwnam/etc...)
3095 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3097 [17441] math: isnan() should use __builtin_isnan() in GCC
3098 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3099 (related to lock elision)
3100 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3101 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3102 [17887] time: strptime should be able to parse "+01:00" style timezones
3103 [17905] libc: catopen() Multiple unbounded stack allocations
3105 [18084] libc: backtrace (..., 0) dumps core on x86
3106 [18086] libc: nice() sets errno to 0 on success
3107 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3108 is too large (CVE-2015-8778)
3109 [18251] dynamic-link: SONAME missing when audit modules provides path
3110 [18265] libc: add attributes for wchar string and memory functions
3111 [18370] math: csqrt missing underflows
3112 [18421] libc: [hppa] read-only segment has dynamic relocations
3113 [18472] libc: Obsolete syscall wrappers should be compat symbols
3114 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3115 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3116 [18525] localedata: Remove locale timezone information
3117 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3118 [18568] localedata: Update locale data to Unicode 8.0
3119 [18589] locale: sort-test.sh fails at random
3120 [18595] math: ctan, ctanh missing underflows
3121 [18604] libc: assert macro-expands its argument
3122 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3123 contains a vector instruction exception.
3124 [18611] math: j1, jn missing errno setting on underflow
3125 [18618] localedata: sync Chechen locale definitions with other *_RU
3127 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3128 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3129 [18665] network: In send_dg, the recvfrom function is NOT always using the
3130 buffer size of a newly created buffer (CVE-2015-7547)
3131 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3133 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3135 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3136 [18699] math: tilegx cproj() for various complex infinities does not yield
3138 [18724] libc: Harden put*ent functions against data injection
3139 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3140 [18755] build: build errors with -DNDEBUG
3141 [18757] stdio: fmemopen fails to set errno on failure
3142 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3144 [18781] libc: openat64 lacks O_LARGEFILE
3145 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3146 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3147 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3148 [18790] math: [ldbl-128ibm] tanhl inaccurate
3149 [18795] libc: stpncpy fortification misses buffer lengths that are
3150 statically too large
3151 [18796] build: build fails for --disable-mathvec
3152 [18803] math: hypot missing underflows
3153 [18820] stdio: fmemopen may leak memory on failure
3154 [18823] math: csqrt spurious underflows
3155 [18824] math: fma spurious underflows
3156 [18825] math: pow missing underflows
3157 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3158 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3159 [18870] build: sem_open.c fails to compile with missing symbol
3161 [18872] stdio: Fix memory leak in printf_positional
3162 [18873] libc: posix_fallocate overflow check ineffective
3163 [18875] math: Excess precision leads incorrect libm
3164 [18877] libc: arm: mmap offset regression
3165 [18887] libc: memory corruption when using getmntent on blank lines
3166 [18918] localedata: hu_HU: change time to HH:MM:SS format
3167 [18921] libc: Regression: extraneous stat() and fstat() performed by
3169 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3170 binaries (CVE-2015-8777)
3171 [18951] math: tgamma missing underflows
3172 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3174 [18953] localedata: lt_LT: change currency symbol to the euro
3175 [18956] math: powf inaccuracy
3176 [18961] math: [i386] exp missing underflows
3177 [18966] math: [i386] exp10 missing underflows
3178 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3179 [18969] build: multiple string test failures due to missing locale
3181 [18970] libc: Reference of pthread_setcancelstate in libc.a
3182 [18977] math: float / long double Bessel functions not in XSI POSIX
3183 [18980] math: i386 libm functions return with excess range and precision
3184 [18981] math: i386 scalb*, ldexp return with excess range and precision
3185 [18982] stdio: va_list and vprintf
3186 [18985] time: Passing out of range data to strftime() causes a segfault
3188 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3189 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3190 [19012] locale: iconv_open leaks memory on error path
3191 [19016] math: clog, clog10 inaccuracy
3192 [19018] nptl: Mangle function pointers in tls_dtor_list
3193 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3194 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3195 [19048] malloc: malloc: arena free list can become cyclic, increasing
3197 [19049] math: [powerpc] erfc incorrect zero sign
3198 [19050] math: [powerpc] log* incorrect zero sign
3199 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3200 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3201 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3202 [19074] network: Data race in _res_hconf_reorder_addrs
3203 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3204 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3205 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3207 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3209 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3210 [19086] manual: posix_fallocate64 documented argument order is wrong.
3211 [19088] math: lround, llround missing exceptions close to overflow
3213 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3214 [19095] math: dbl-64 lrint incorrect for 64-bit long
3215 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3216 [19124] dynamic-link: ld.so failed to build with older assmebler
3217 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3218 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3219 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3220 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3221 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3222 pthread_setaffinity_np
3223 [19156] math: [ldbl-128] j0l spurious underflows
3224 [19164] nptl: tst-getcpu fails with many possible CPUs
3225 [19168] math: math/test-ildoubl and math/test-ldouble failure
3226 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3227 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3229 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3230 (FE_NOMASK_ENV) do not clear SSE exceptions
3231 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3232 _int_new_arena/reused_arena
3233 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3234 [19201] math: dbl-64 remainder incorrect sign of zero result
3235 [19205] math: bits/math-finite.h conditions do not match math.h and
3237 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3238 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3239 for C99-based standards
3240 [19212] libc: features.h not -Wundef clean
3241 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3243 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3244 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3245 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3247 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3248 "inexact" exceptions
3249 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3251 [19242] libc: strtol incorrect in Turkish locales
3252 [19243] malloc: reused_arena can pick an arena on the free list, leading
3253 to an assertion failure and reference count corruption
3254 [19253] time: tzset() ineffective when temporary TZ did not include DST
3256 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3257 [19270] math: [hppa] Shared libm missing __isnanl
3258 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3259 MAP_HUGETLB and MAP_STACK defines
3260 [19313] nptl: Wrong __cpu_mask for x32
3261 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3262 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3263 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3264 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3265 [19363] time: x32: times() return value wrongly truncates/sign extends
3267 [19367] dynamic-link: Improve branch prediction on Silvermont
3268 [19369] network: Default domain name not reset by res_ninit when "search"
3269 / "domain" entry is removed from resolv.conf
3270 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3272 [19385] localedata: bg_BG: time separator should be colon, not comma
3273 [19408] libc: linux personality syscall wrapper may erroneously return an
3274 error on 32-bit architectures
3275 [19415] libc: dladdr returns wrong names on hppa
3276 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3277 IBM905, IBM907, and IBM909
3278 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3279 [19443] build: build failures with -DDEBUG
3280 [19451] build: Make check fails on test-double-vlen2
3281 [19462] libc: Glibc failed to build with -Os
3282 [19465] math: Wrong code with -Os
3283 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3285 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3287 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3288 [19486] math: S390: Math tests fail with "Exception Inexact set".
3289 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3290 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3292 [19590] math: Fail to build shared objects that use libmvec.so functions.
3296 * The following bugs are resolved with this release:
3298 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3299 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3300 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3301 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3302 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3303 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3304 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3305 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3306 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3307 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3308 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3309 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3310 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3311 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3312 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3313 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3314 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3315 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3316 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3317 18657, 18676, 18694, 18696, 18887.
3319 * Cache information can be queried via sysconf() function on s390 e.g. with
3320 _SC_LEVEL1_ICACHE_SIZE as argument.
3322 * A buffer overflow in gethostbyname_r and related functions performing DNS
3323 requests has been fixed. If the NSS functions were called with a
3324 misaligned buffer, the buffer length change due to pointer alignment was
3325 not taken into account. This could result in application crashes or,
3326 potentially arbitrary code execution, using crafted, but syntactically
3327 valid DNS responses. (CVE-2015-1781)
3329 * The time zone file parser has been made more robust against crafted time
3330 zone files, avoiding heap buffer overflows related to the processing of
3331 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3332 large time zone data files. Overly long time zone specifiers in the TZ
3333 variable no longer result in stack overflows and crashes.
3335 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3336 for LD and GD on x86 and x86-64, has been implemented. You will need
3337 binutils-2.24 or later to enable this optimization.
3339 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3340 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3341 Hat). These updates cause user visible changes, such as the fix for bug
3344 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3345 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3346 condition in some applications.
3348 * Added vector math library named libmvec with the following vectorized x86_64
3349 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3351 The library can be disabled with --disable-mathvec. Use of the functions is
3352 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3353 Shared library libmvec.so is linked in as needed when using -lm (no need to
3354 specify -lmvec explicitly for not static builds).
3355 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3357 * A new fmemopen implementation has been added with the goal of POSIX
3358 compliance. The new implementation fixes the following long-standing
3359 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3360 old implementation is still present for use be by existing binaries.
3362 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3363 releases. It has been fixed to match 2.19 and older, but binaries built
3364 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3366 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3367 Contributed by Roland McGrath (Google).
3369 * The header <regexp.h> is deprecated, and will be removed in a future
3370 release. Use of this header will trigger a deprecation warning.
3371 Application developers should update their code to use <regex.h> instead.
3373 This header was formerly part of SUS, but was deprecated in 1994 and
3374 removed from the standard in 2001. Also, the glibc implementation
3375 leaks memory. See BZ#18681 for more details.
3379 * The following bugs are resolved with this release:
3381 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3382 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3383 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3384 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3385 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3386 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3387 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3388 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3389 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3390 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3393 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3394 too little memory for the to-be-scanned arguments and overflow the
3395 allocated buffer. The implementation now correctly computes the required
3396 buffer size when using malloc, and switches to malloc from alloca as
3399 * A new semaphore algorithm has been implemented in generic C code for all
3400 machines. Previous custom assembly implementations of semaphore were
3401 difficult to reason about or ensure that they were safe. The new version
3402 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3403 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3404 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3406 * Port to Altera Nios II has been contributed by Mentor Graphics.
3408 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3409 implementations for powerpc64/powerpc64le.
3410 Implemented by Adhemerval Zanella (IBM).
3412 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3413 and powerpc64le. This may improve lock scaling of existing programs on
3414 HTM capable systems. The lock elision code is only enabled with
3415 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3416 powerpc will issue a transaction abort on every syscall to avoid side
3417 effects being visible outside transactions.
3419 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3420 AArch64. Contributed by ARM Ltd.
3422 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3424 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3425 under certain input conditions resulting in the execution of a shell for
3426 command substitution when the application did not request it. The
3427 implementation now checks WRDE_NOCMD immediately before executing the
3428 shell and returns the error WRDE_CMDSUB as expected.
3430 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3431 processing format strings with a large number of format specifiers.
3433 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3434 infinite loop if the DNS response contained a PTR record of an unexpected
3437 * The minimum GCC version that can be used to build this version of the GNU
3438 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3439 still be used to compile programs using the GNU C Library.
3441 * The GNU C Library is now built with -Werror by default. This can be
3442 disabled by configuring with --disable-werror.
3444 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3446 * The obsolete sigvec function has been removed. This was the original
3447 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3448 programs have been using instead for about 25 years. Of course, ABI
3449 compatibility for old binaries using sigvec remains intact.
3451 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3452 with newer versions of bison.
3454 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3455 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3456 registers overlay two consecutive single-precision registers. MIPS32R2
3457 introduced a new FPU mode (FR=1) where double-precision registers extend the
3458 corresponding single-precision registers which is incompatible with the
3459 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3460 require the use of FR=1 making a transition necessary. New o32 ABI
3461 extensions enable users to migrate over time from the original o32 ABI
3462 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3463 tracks the ABI of any loaded object and verifies that new objects are
3464 compatible. Mode transitions will also be requested as required and
3465 unsupportable objects will be rejected. The ABI checks include both soft and
3466 hard float ABIs for o32, n32 and n64.
3468 GCC 5 with GNU binutils 2.25 onwards:
3469 It is strongly recommended that all o32 system libraries are built using the
3470 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3471 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3472 compiler using --with-fp-32=xx to set this by default.
3476 * The following bugs are resolved with this release:
3478 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3479 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3480 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3481 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3482 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3483 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3484 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3485 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3486 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3487 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3488 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3489 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3490 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3491 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3492 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3494 * Reverted change of ABI data structures for s390 and s390x:
3495 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3496 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3497 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3498 are preserved pointing straight to the same implementation as the old ones.
3499 Given that, new callers will simply provide a too-big buffer to these
3500 functions. Any applications/libraries out there that embed jmp_buf or
3501 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3502 against 2.19 headers will have to rebuilt again. This is necessary in any
3503 case to revert the breakage in their ABI caused by the glibc change.
3505 * Support for file description locks is added to systems running the
3506 Linux kernel. The standard file locking interfaces are extended to
3507 operate on file descriptions, not file descriptors, via the use of
3508 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3509 are associated with an open file instead of a process.
3511 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3513 * The minimum Linux kernel version that this version of the GNU C Library
3514 can be used with is 2.6.32.
3516 * Running the testsuite no longer terminates as soon as a test fails.
3517 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3518 with PASS or FAIL lines for individual tests. A summary of the results is
3519 printed, including a list of failing lists, and "make check" exits with
3520 error status if there were any unexpected failures. "make check
3521 stop-on-test-failure=y" may be used to keep the old behavior.
3523 * The am33 port, which had not worked for several years, has been removed
3526 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3527 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3528 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3529 conflicted with POSIX (support for which was removed in 2.19), the
3530 interfaces those macros enabled remain available when compiling with
3531 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3532 test macros defined.
3534 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3536 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3537 This may improve lock scaling of existing programs on TX capable systems.
3538 The lock elision code is only built with --enable-lock-elision=yes and
3539 then requires a GCC version supporting the TX builtins. With lock elision
3540 default mutexes are elided via __builtin_tbegin, if the cpu supports
3541 transactions. By default lock elision is not enabled and the elision code
3544 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3545 copy the path argument. This allowed programs to cause posix_spawn to
3546 deference a dangling pointer, or use an unexpected pathname argument if
3547 the string was modified after the posix_spawn_file_actions_addopen
3550 * All supported architectures now use the main glibc sysdeps directory
3551 instead of some being in a separate "ports" directory (which was
3552 distributed separately before glibc 2.17).
3554 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3555 On configurations that support it (all Linux configurations), it's now
3556 used regardless of the --enable-add-ons switch to configure. It is no
3557 longer possible to build such configurations without pthreads support.
3559 * Locale names, including those obtained from environment variables (LANG
3560 and the LC_* variables), are more tightly checked for proper syntax.
3561 setlocale will now fail (with EINVAL) for locale names that are overly
3562 long, contain slashes without starting with a slash, or contain ".." path
3563 components. (CVE-2014-0475) Previously, some valid locale names were
3564 silently replaced with the "C" locale when running in AT_SECURE mode
3565 (e.g., in a SUID program). This is no longer necessary because of the
3568 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3569 with application code using Intel MPX instructions. (With all previous
3570 versions, the MPX register state could be clobbered when making calls
3571 into or out of a shared library.) Note that while the new dynamic
3572 linker is compatible with all known x86 hardware whether or not it
3573 supports Intel MPX, some x86 instruction-set emulators might fail to
3574 handle the new instruction encodings. This is known to affect Valgrind
3575 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3576 release), and might affect other tools that do instruction emulation.
3578 * Support for loadable gconv transliteration modules has been removed.
3579 The support for transliteration modules has been non-functional for
3580 over a decade, and the removal is prompted by security defects. The
3581 normal gconv conversion modules are still supported. Transliteration
3582 with //TRANSLIT is still possible, and the //IGNORE specifier
3583 continues to be supported. (CVE-2014-5119)
3585 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3586 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3587 resulting a denial-of-service security vulnerability in applications which
3588 use functions related to iconv. (CVE-2014-6040)
3592 * The following bugs are resolved with this release:
3594 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3595 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3596 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3597 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3598 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3599 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3600 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3601 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3602 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3603 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3604 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3605 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3606 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3607 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3608 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3609 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3610 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3611 16431, 16453, 16474, 16506, 16510, 16529
3613 * Slovenian translations for glibc messages have been contributed by the
3614 Translation Project's Slovenian team of translators.
3616 * The public headers no longer use __unused nor __block. This change is to
3617 support compiling programs that are derived from BSD sources and use
3618 __unused internally, and to support compiling with Clang's -fblock
3619 extension which uses __block.
3621 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3622 large collation sequences to optimize multiple passes. This cache
3623 computation may overflow for large collation sequences and may cause a
3624 stack or buffer overflow. This is now fixed to use a slower algorithm
3625 which does not use a cache if there is an integer overflow.
3627 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3628 rules for large collation sequences to optimize multiple passes and falls
3629 back to alloca if malloc fails, resulting in a possible stack overflow.
3630 The implementation now falls back to an uncached collation sequence lookup
3633 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3634 initialized for static applications resulting in the security feature
3635 being disabled. The pointer guard is now correctly initialized to a
3636 random value for static applications. Existing static applications need
3637 to be recompiled to take advantage of the fix (bug 15754).
3639 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3640 to the d_name member of struct dirent, or omit the terminating NUL
3641 character. (Bugzilla #14699).
3643 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3644 aligned_alloc functions could allocate too few bytes or corrupt the
3645 heap when passed very large allocation size values (Bugzilla #15855,
3648 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3649 for AF_INET6 has been fixed (Bugzilla #16072).
3651 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3652 pap_CW, quz_PE, the_NP.
3654 * Substantially revised locales: gd_GB, ht_HT
3656 * The LC_ADDRESS field was updated to support country_car for almost all
3659 * ISO 1427 definitions were updated.
3661 * ISO 3166 definitions were updated.
3663 * The localedef utility now supports --big-endian and --little-endian
3664 command-line options to generate locales for a different system from that
3665 for which the C library was built.
3667 * Binary locale files now only depend on the endianness of the system for
3668 which they are generated and not on other properties of that system. As a
3669 consequence, binary files generated with new localedef may be incompatible
3670 with old versions of the GNU C Library, and binary files generated with
3671 old localedef may be incompatible with this version of the GNU C Library,
3672 in the following circumstances:
3674 + Locale files may be incompatible on m68k systems.
3676 + Locale archive files (but not separate files for individual locales) may
3677 be incompatible on systems where plain "char" is signed.
3679 * The configure option --disable-versioning has been removed. Builds with
3680 --disable-versioning had not worked for several years.
3682 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3683 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3685 * SystemTap probes for malloc have been introduced.
3687 * SystemTap probes for slow multiple precision fallback paths of
3688 transcendental functions have been introduced.
3690 * Support for powerpc64le has been added.
3692 * The soft-float powerpc port now supports e500 processors.
3694 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3696 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3697 set of header declarations that are enabled by default, even when other
3698 feature test macros or compiler options such as -std=c99 would otherwise
3699 disable some of those declarations.
3701 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3702 conflict with POSIX. The libbsd-compat library (which was a dummy library
3703 that did nothing) has also been removed.
3705 * Preliminary documentation about Multi-Thread, Async-Signal and
3706 Async-Cancel Safety has been added.
3708 * Change of ABI data structures for s390 and s390x:
3709 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3710 allow for future hardware extensions. All library functions that accept or
3711 return these structures were versioned in order to provide backwards
3712 compatibility with existing code. However, not all cases can be handled
3713 with interface versioning. If an application embeds either structure into
3714 another structure and that structure is passed to another compilation unit
3715 which expects the newer larger-sized object then any access to the new
3716 fields will result in undefined behaviour. Similarly any access to fields
3717 that were moved by the enlarging of the structures will cause undefined
3718 behaviour. To fix the undefined behaviour all objects that are part of the
3719 final in-memory image must agree on the size of structures, and this may
3720 require recompilation.
3724 * The following bugs are resolved with this release:
3726 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3727 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3728 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3729 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3730 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3731 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3732 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3733 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3734 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3735 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3736 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3737 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3738 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3741 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3742 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3743 Distributions can re-enable building and using pt_chown via the new configure
3744 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
3745 considerable security risks and should only be used if the distribution
3746 understands and accepts the risks.
3748 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3751 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3752 fixed (Bugzilla #15330).
3754 * Add support for calling C++11 thread_local object destructors on thread
3755 and program exit. This needs compiler support for offloading C++11
3756 destructor calls to glibc.
3758 * Improved worst case performance of libm functions with double inputs and
3761 * Support for priority inherited mutexes in pthread condition variables on
3762 non-x86 architectures.
3764 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
3766 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
3768 * Optimized string functions for ARM. Implemented by Will Newton and
3771 * Optimized libm functions for SPARC. Implemented by David S. Miller.
3773 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
3776 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
3777 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
3779 * Added a benchmark framework to track performance of functions in glibc.
3781 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
3782 It is based on draft TS 18661 and currently enabled as a GNU extension.
3784 * On Linux, the clock function now uses the clock_gettime system call
3785 for improved precision, rather than old times system call.
3787 * Added support for version-3 tz format files. This is needed when using
3788 the tz database release 2013e or later, and affects a few unusual cases --
3789 currently only TZ='America/Godthab' for time stamps after 2037.
3791 * Added new API functions pthread_getattr_default_np and
3792 pthread_setattr_default_np to get and set the default pthread
3793 attributes of a process.
3795 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
3796 This may improve lock scaling of existing programs on TSX capable systems.
3797 When the --enable-lock-elision=yes parameter is specified at configure
3798 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
3801 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
3802 availability). Implemented by Ryan S. Arnold.
3804 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
3808 * The following bugs are resolved with this release:
3810 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
3811 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
3812 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
3813 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
3814 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
3815 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
3816 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
3817 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
3818 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
3819 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
3820 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
3821 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
3822 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
3823 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
3824 14879, 14889, 14893, 14898, 14914.
3826 * Optimization of memcpy for MIPS.
3828 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
3829 EMFILE has been fixed (Bugzilla #14889).
3831 * The add-on ports collection is now distributed in the "ports" subdirectory
3832 of the main GNU C Library distribution, rather than separately.
3834 * Port to ARM AArch64 contributed by Linaro.
3836 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
3837 Optimized versions of memcpy, memset, and memcmp added for System z10 and
3839 Implemented by Andreas Krebbel.
3841 * The new function secure_getenv allows secure access to the environment,
3842 returning NULL if running in a SUID/SGID process. This function replaces
3843 the internal function __secure_getenv.
3845 * SystemTap static probes have been added into the dynamic linker.
3846 Implemented by Gary Benson.
3848 * Optimizations of string functions strstr, strcasestr and memmem.
3849 Implemented by Maxim Kuvyrkov.
3851 * The minimum Linux kernel version that this version of the GNU C Library
3852 can be used with is 2.6.16.
3854 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
3855 powerpc POWER7. Implemented by Will Schmidt.
3857 * New configure option --disable-nscd builds the C library such that it
3858 never attempts to contact the Name Service Caching Daemon (nscd).
3859 New configure option --disable-build-nscd avoids building nscd itself;
3860 this is the default if --disable-nscd is used.
3862 * Improved support for cross-compilation, including cross-testing and
3863 bootstrap builds without a previously built glibc.
3865 * Several testsuite tests are now able to test multiple IFUNC variants of an
3866 interface, rather than just testing the one that would be chooen by
3869 * New configure options --with-bugurl and --with-pkgversion, for
3870 distributors to use to embed their bug-reporting and package version
3871 information in --help and --version output.
3873 * The ttyname and ttyname_r functions on Linux now fall back to searching for
3874 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
3875 allows creation of chroots without the procfs mounted on /proc.
3877 * The `crypt' function now fails if passed salt bytes that violate the
3878 specification for those values. On Linux, the `crypt' function will
3879 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
3880 enabled, and fail on encrypted strings using the MD5 or DES algorithm
3881 when the mode is enabled.
3883 * The `clock_*' suite of functions (declared in <time.h>) is now available
3884 directly in the main C library. Previously it was necessary to link with
3885 -lrt to use these functions. This change has the effect that a
3886 single-threaded program that uses a function such as `clock_gettime' (and
3887 is not linked with -lrt) will no longer implicitly load the pthreads
3888 library at runtime and so will not suffer the overheads associated with
3889 multi-thread support in other code such as the C++ runtime library.
3891 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
3896 * The following bugs are resolved with this release:
3898 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
3899 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
3900 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
3901 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
3902 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
3903 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
3904 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
3905 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
3906 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
3907 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
3908 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
3909 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
3910 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
3911 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
3912 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
3913 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
3914 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
3915 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
3916 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
3917 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
3918 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
3919 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
3922 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
3923 configuring glibc with:
3924 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
3925 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
3926 Implemented by H.J. Lu.
3930 + define static_assert
3932 + do not declare gets
3934 + declare at_quick_exit and quick_exit also for ISO C11
3936 + aligned_alloc. NB: The code is deliberately allows the size parameter
3937 to not be a multiple of the alignment. This is a moronic requirement
3938 in the standard but it is only a requirement on the caller, not the
3941 + timespec_get added
3943 + uchar.h support added
3945 + CMPLX, CMPLXF, CMPLXL added
3947 Implemented by Ulrich Drepper.
3949 * Support for the IA-64 has been moved to ports.
3951 * Remove support for anything but ELF binary format
3953 * Checking versions of poll, ppoll added.
3954 Implemented by Ulrich Drepper.
3956 * More generic and 64-bit performance optimizations to math functions.
3957 Implemented by Ulrich Drepper.
3959 * New configure option --enable-obsolete-rpc makes the deprecated RPC
3960 headers and functions available at compile time as they were before
3961 version 2.14. This option will be removed at some time in the future
3962 after the TI-RPC library becomes fully sufficient for the needs of
3963 existing applications.
3965 * Compatibility code for Linux kernel versions before 2.4 has been removed.
3966 Note that glibc is not expected to work with any Linux kernel version
3969 * New header <sys/auxv.h> and function getauxval allowing easy access to
3970 the AT_* key-value pairs passed from the Linux kernel. The header also
3971 defines the HWCAP_* bits associated with the AT_HWCAP key.
3973 * New locales: mag_IN
3975 * New configure option --enable-systemtap builds SystemTap static probes
3976 into libc for setjmp and longjmp and into libpthread for various operations.
3977 So far the setjmp/longjmp probes and some of the libpthread probes are
3978 provided only for i*86 and x86_64.
3979 Implemented by Roland McGrath and Rayson Ho.
3981 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
3983 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
3986 * More optimized functions for SPARC. Implemented by David S. Miller.
3988 * Improved support for cross-compilation, especially bootstrap builds
3989 without a previously built glibc.
3991 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
3992 Chris Metcalf from Tilera.
3994 * Support for the old ARM ABI has been removed from ports. Only the EABI is
3995 now supported for ARM processors.
3997 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
3998 as the name of the dynamic linker, to distinguish it from the
3999 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4001 * Support for CRIS has been removed from ports.
4003 * A new class of installed header has been documented for low-level
4004 platform-specific functionality. PowerPC added the first instance with a
4005 function to provide time base register access. Contributed by Tulio
4006 Magno Quites Machado Filho.
4008 * ix86 configurations now install header files that are consistent with
4009 what x86-64 configurations install. These same header files can be used
4010 for -m32, -m64, or -mx32 builds.
4011 Contributed by H.J. Lu.
4013 * Math library bug fixes. A thorough audit of all open math library bugs was
4014 conducted by Joseph Myers. Significant progress was made on many math
4015 library bugs resulting in more accurate exceptions and function results.
4016 Many thanks to all those that contributed including Andreas Jaeger for his
4017 patch review and work on the x87 trigonometric instruction issues.
4019 * Timezone data is no longer installed. Timezone-related binaries and scripts
4020 will continue to be installed. Users should obtain their timezone data from
4021 their distribution provider or from the tzdata package at
4022 <ftp://munnari.oz.au/pub/>.
4026 * The following bugs are resolved with this release:
4028 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4029 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4030 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4031 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4032 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4033 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4034 13484, 13506, 13515, 13523, 13524, 13538, 13540
4036 * New program pldd to list loaded object of a process
4037 Implemented by Ulrich Drepper.
4039 * Add nss_db support back to glibc. No more dependency on Berkeley db
4040 and support for initgroups lookups.
4041 Implemented by Ulrich Drepper.
4043 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4044 Contributed by HJ Lu.
4046 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4047 Contributed by HJ Lu.
4049 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4050 on x86-32 and x86-64.
4051 Contributed by Liubov Dmitrieva.
4053 * Optimized strchr and strrchr for SSE on x86-32.
4054 Contributed by Liubov Dmitrieva.
4056 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4057 for x86-64 and x86-32.
4058 Contributed by Liubov Dmitrieva.
4060 * New interfaces: scandirat, scandirat64
4061 Implemented by Ulrich Drepper.
4063 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4064 Implemented by Ulrich Drepper.
4066 * nscd now also caches the netgroup database.
4067 Implemented by Ulrich Drepper.
4069 * Integrate libm with gcc's -ffinite-math-only option.
4070 Implemented by Ulrich Drepper.
4072 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4073 to math functions. Implemented by Ulrich Drepper.
4075 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4076 Implemented by Ulrich Drepper.
4078 * New Linux interfaces: process_vm_readv, process_vm_writev
4080 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4081 Implemented by Ulrich Drepper.
4083 * Optimized nearbyint and strcasecmp for PPC.
4084 Implemented by Adhemerval Zanella.
4086 * New locales: bho_IN, unm_US, es_CU, ta_LK
4090 * The following bugs are resolved with this release:
4092 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4093 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4094 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4095 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4096 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4097 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4098 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4099 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4100 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4101 12795, 12811, 12813, 12814, 12841
4103 * The RPC implementation in libc is obsoleted. Old programs keep working
4104 but new programs cannot be linked with the routines in libc anymore.
4105 Programs in need of RPC functionality must be linked against TI-RPC.
4106 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4108 Visible changes of this change include (obviously) the inability to link
4109 programs using RPC functions without referencing the TI-RPC library and the
4110 removal of the RPC headers from the glibc headers.
4111 Implemented by Ulrich Drepper.
4113 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4114 syncfs, setns, sendmmsg
4116 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4117 yue_HK, lij_IT, mhr_RU
4119 * New encodings: CP770, CP771, CP772, CP773, CP774
4121 * New program sotruss to trace calls through PLTs
4122 Implemented by Ulrich Drepper.
4124 * The malloc hook implementation is marked deprecated and will be removed
4125 from the default implementation in the next version. The design never
4126 worked ever since the introduction of threads. Even programs which do
4127 not create threads themselves can use multiple threads created internally.
4131 * The following bugs are resolved with this release:
4133 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4134 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4135 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4136 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4139 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4141 * POWER7 optimizations: memset, memcmp, strncmp
4143 * New optimized string functions for x86-64: strnlen (SSE2),
4144 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4145 Implemented by Ulrich Drepper.
4149 * The following bugs are resolved with this release:
4151 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4152 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4153 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4154 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4155 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4156 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4157 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4158 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4160 * New interfaces: pthread_getname_np, pthread_setname_np
4162 * New Linux interface: recvmmsg
4164 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4166 * The dynamic linker now recognizes supported ABI versions from the
4167 EI_ABIVERSION field in the ELF header.
4168 Implemented by Ulrich Drepper.
4170 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4171 will not be used to fill in password fields in the passwd.byname replies.
4172 Instead it is used to synthesize the shadow.byname table, should it be
4173 missing. This is a useful mode in some installations involving Solaris.
4174 Implemented by Ulrich Drepper.
4176 * New locales: kok_IN, sq_MK, cv_RU
4180 * The following bugs are resolved with this release:
4182 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4183 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4184 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4185 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4186 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4187 10789, 10817, 10823, 10840, 10847
4189 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4191 Implemented by Ulrich Drepper.
4193 * Checking version of longjmp added that fails if an uninitialized stack
4194 frame would be created. Implemented by Ulrich Drepper.
4196 * STT_GNU_IFUNC is now supported in static executables.
4197 Implemented by H.J. Lu.
4199 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4201 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4202 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4203 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4204 Contributed by H.J. Lu.
4206 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4207 Implemented by Ulrich Drepper.
4209 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4211 Contributed by H.J. Lu.
4213 * Support for fma instruction in AVX on x86-64.
4214 Implemented by H.J. Lu and Ulrich Drepper.
4216 * AVX support in x86-64 auditing support in ld.so.
4217 Implemented by H.J. Lu.
4219 * STB_GNU_UNIQUE support added.
4220 Implemented by Ulrich Drepper.
4222 * Implement second fallback mode for optimized DNS lookup for even more
4223 broken environments. If two requests from the same port are not
4224 handled correctly close the socket and open a new one before sending
4225 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4226 can be used to select this mode right away, instead of rediscovering the
4227 necessity is every process again.
4228 Implemented by Ulrich Drepper.
4230 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4231 Implemented by Adam Tkac.
4233 * Optimized iconv conversions for S390x.
4234 Implemented by Andreas Krebbel.
4236 * Using condvars with PI mutexes is now more efficient due to kernel
4237 support for requeueing to PI futexes. NPTL support added for x86-64.
4238 Implemented by Ulrich Drepper.
4240 * New locales: ps_AF, my_MM
4244 * The following bugs are resolved with this release:
4246 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4247 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4248 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4249 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4250 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4252 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4253 Implemented by Ulrich Drepper.
4255 * New Linux interfaces: accept4, fallocate, fallocate64.
4256 Implemented by Ulrich Drepper.
4258 * Correct declarations of string function when used in C++ code. This
4259 could lead to compile errors for invalid C++ code.
4261 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4264 * New POSIX 2008 interface: psiginfo
4265 Implemented by Ulrich Drepper.
4267 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4268 Implemented by Ulrich Drepper.
4270 * Support for selecting between multiple function definitions at runtime
4271 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4273 * The libcrypt library can now use the hash function implementations in
4274 NSS. Implemented by Ulrich Drepper.
4276 * The malloc implementation can be compiled to be less memory efficient
4277 but higher performing in multi-threaded programs.
4278 Implemented by Ulrich Drepper.
4280 * New locales: nan_TW@latin, ks_IN
4282 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4283 Implemented by Ulrich Drepper.
4285 * Extended printf hook support. It is possible to use user-defined types
4286 and extend existing format specifiers.
4287 Implemented by Ulrich Drepper.
4289 * Handling for group shadow files has been added.
4290 Implemented by Ulrich Drepper.
4292 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4293 servers (the case, e.g., for some people using the built-in DNS
4294 server in ADSL modems/routers). There is a once-per-process timeout
4295 in case of a broken server. To avoid it, users can run nscd or put
4296 'options single-request' in /etc/resolv.conf.
4297 Implemented by Ulrich Drepper.
4301 * The following bugs are resolved with this release:
4303 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
4304 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
4305 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
4306 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
4307 6968, 6974, 6980, 6995, 7008, 7009, 7029
4309 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4310 up at the same time. Implemented by Ulrich Drepper.
4312 * TLS descriptors for LD and GD on x86 and x86-64.
4313 Implemented by Alexandre Oliva.
4315 * getaddrinfo now handles DCCP and UDPlite.
4316 Implemented by Ulrich Drepper.
4318 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4319 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4320 Implemented by Ulrich Drepper.
4322 * New implementation of memmem, strstr, and strcasestr which is O(n).
4323 Implemented by Eric Blake.
4325 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4327 * Implement "e" option for popen to open file descriptor with the
4328 close-on-exec flag set. Implemented by Ulrich Drepper.
4330 * Implement "b" mode for fmemopen. In this mode writes writes don't
4331 implicitly add a NUL byte and seeks from the end of the buffer really
4332 use the buffer end, not the string length as the basis.
4333 Implemented by Ulrich Drepper.
4335 * Many functions, exported and internal, now atomically set the close-on-exec
4336 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4338 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4340 Implemented by Pravin Satpute.
4342 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4346 * The following bugs are resolved with this release:
4348 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4349 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4350 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4351 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4352 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4353 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4354 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4356 * New locales: bo_CN, bo_IN, shs_CA.
4358 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4360 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4361 Implemented by Pravin Satpute.
4363 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4365 * nscd caches now all timeouts for DNS entries
4366 Implemented by Ulrich Drepper.
4368 * nscd is more efficient and wakes up less often.
4369 Implemented by Ulrich Drepper.
4371 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4372 vdprintf, and obstack_vprintf.
4373 Implemented by Jakub Jelinek.
4375 * Faster memset for x86-64.
4376 Implemented by Harsha Jagasia and H.J. Lu.
4378 * Faster memcpy on x86.
4379 Implemented by Ulrich Drepper.
4381 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4382 Implemented by Ulrich Drepper.
4384 * Faster sqrt and sqrtf implemention for some PPC variants.
4385 Implemented by Steven Munroe.
4389 * The following bugs are resolved with this release:
4391 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4392 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4393 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4394 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4395 5071, 5103, 5104, 5112, 5113, 5184, 5186
4397 * More checking functions: fread, fread_unlocked, open*, mq_open.
4398 Implemented by Jakub Jelinek and Ulrich Drepper.
4400 * Extend fortification to C++. Implemented by Jakub Jelinek.
4402 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4403 by not recognizing 'a' as a modifier when those specs are requested.
4404 Implemented by Jakub Jelinek.
4406 * PPC optimizations to math and string functions.
4407 Implemented by Steven Munroe.
4409 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4410 options to be passed. Implemented by Ulrich Drepper.
4412 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4414 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4415 Implemented by Ulrich Drepper.
4417 * Handle private futexes in the NPTL implementation.
4418 Implemented by Jakub Jelinek and Ulrich Drepper.
4420 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4421 Implemented by Roland McGrath and Ulrich Drepper.
4423 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4425 * SHA-256 and SHA-512 based password encryption.
4426 Implemented by Ulrich Drepper.
4428 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4429 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4432 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4433 Implemented by Ulrich Drepper.
4437 * The following bugs are resolved with this release:
4439 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4440 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4441 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4442 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4443 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4444 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4445 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4448 * New Linux interfaces: epoll_pwait, sched_getcpu.
4450 * New generic interfaces: strerror_l.
4452 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4456 * The following bugs are resolved with this release:
4458 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4459 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4460 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4461 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4462 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4463 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4464 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4465 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4466 3225, 3251, 3252, 3253, 3273
4468 * For Linux, the sorting of addresses returned by getaddrinfo now also
4469 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4470 Implemented by Ulrich Drepper.
4472 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4473 Implemented by Ulrich Drepper.
4475 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4477 * New iconv module for MIK. Contributed by Alexander Shopov.
4479 * For sites with broken group and/or passwd database, the auto-propagate
4480 option of nscd can prevent creating ID lookup entries from the results
4481 of a name lookup and vice versa. This usually is no problem but some
4482 site might have problems with the default behavior.
4483 Implemented by Ulrich Drepper.
4485 * Iterating over entire database in NIS can be slow. With the
4486 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4487 to trade time for memory. The entire database will be read at once.
4488 Implemented by Ulrich Drepper.
4490 * The interfaces introduced in RFC 3542 have been implemented by
4493 * Support for the new ELF hash table format was added by Ulrich Drepper.
4495 * Support for priority inheritance mutexes added by Jakub Jelinek and
4498 * Support for priority protected mutexes added by Jakub Jelinek.
4500 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4501 or_IN, csb_PL, fy_NL, sr_ME.
4505 * More overflow detection functions.
4507 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4508 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4510 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4511 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4512 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4513 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4514 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4515 by Masahide Washizawa.
4517 * It is now possible to install audit libraries for the dynamic linker using
4518 LD_AUDIT. Implemented by Ulrich Drepper.
4520 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4521 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4522 For a libc and libpthread that works well on Linux 2.4 kernels, we
4523 recommend using the stable 2.3 branch.
4525 * The new function open_wmemstream acts like open_memstream,
4526 but uses a wchar_t wide character buffer.
4528 * The new function ppoll is an improved version of poll, similar to pselect.
4530 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4531 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4532 renameat, unlinkat, linkat, symlinkat, readlinkat.
4534 * New Linux kernel system calls: unshare,
4535 inotify_init, inotify_add_watch, inotify_rm_watch.
4537 * The euidaccess function is now also known by the alias eaccess,
4538 for compatibility with some other systems.
4540 * Timezone data updated to 2006b version.
4544 * The following bugs are resolved with this release:
4546 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4547 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4548 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4549 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4550 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4551 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4553 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4555 * As of this release, GCC 4 can be used to compile the C Library.
4557 * Timezone data updated to 2005m version.
4561 * The following bugs are resolved with this release:
4563 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4564 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4565 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4566 777, 787, 821, 822, 823, 825
4568 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4572 * Support for RFC 3678. Real implementations exist only for Linux so far.
4573 Implemented by Ulrich Drepper.
4575 * nscd can now cache entries persistently. Expiring entries are reloaded.
4576 For speedups the cache can be shared in memory with client processes.
4577 Implemented by Ulrich Drepper.
4579 * nscd can now perform SELinux checks.
4580 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4582 * getaddrinfo queries are now cached. Canonical name lookup is performed
4584 Implemented by Ulrich Drepper.
4586 * The nothrow function attribute is used when headers are used by gcc when
4587 compiling C code. This can avoid significant amounts of exception
4590 * The malloc functions perform more error checking and are stricter when
4591 it comes to reacting on errors. The default action is to terminate
4592 the process after showing an error message. Implemented by Ulrich Drepper.
4594 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4595 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
4597 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
4598 namespaces using the new function dlmopen(). This feature is of course,
4599 like most other dynamic loading functionality, not available in statically
4600 linked applications. Implemented by Ulrich Drepper.
4602 * Low-overhead boundary checking variants of string and some stdio functions
4603 were added. These are to be used in conjunction with a gcc patch by
4604 Jakub Jelinek which adds calls to these functions if possible.
4605 Implemented by Jakub Jelinek and Ulrich Drepper.
4607 * Old code for several operating systems and machine architectures that
4608 have not been in working condition in a long time have been removed from
4609 the main source tree maintained by the GNU C Library's maintainers.
4610 These files are now reside in the separate `ports' source module
4611 that is usable as an add-on when building the library.
4615 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4616 interrogate the dynamic linker, compatible with the Solaris interface.
4618 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4619 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4621 * getifaddrs now uses the netlink interface on Linux to get its information.
4622 Implemented by Thorsten Kukuk.
4624 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4625 Implemented by Ulrich Drepper.
4627 * support for non-executable stacks on x86 has been added. Changes mostly
4630 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
4633 * getaddrinfo now performs destination address selection according to
4638 * Thread-safe interfaces for many functions that access locale data
4639 were added in version 2.3, but these features were omitted from NEWS.
4640 Many functions have variants with an `_l' suffix that take a `locale_t'
4641 object as a parameter rather than consulting the current locale.
4642 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4643 create and maintain `locale_t' objects. Additionally, the new function
4644 `uselocale' sets "the current locale" (as used by functions not so
4645 parameterized) set for an individual thread. These features were added
4646 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4648 * The functions getresuid, getresgid, setresuid, and setresgid, which
4649 have long been available on Linux, are now declared in <unistd.h>
4650 and are now also available on the Hurd.
4652 * ELF thread-local storage support (TLS) now works on x86-64.
4654 * The new dynamic string token $LIB is expanded in shared library names.
4655 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4657 * Aldy Hernandez contributed complete software floating point support for
4658 PowerPC machines with no FPU.
4660 * fexecve is implemented on Linux.
4662 * The `btowc' function should work at least twice as fast due to
4663 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
4665 * With approriate thread add-ons cancelable functions are now implemented
4666 in libc.so as well. No need to call the function in libpthread. This
4667 change allowed to finally disable the incorrect and expensive handling
4668 of weak definition in ld.so.
4670 * Yet more PLT entries in libc.so have been removed. We finally arrived
4671 at the bare minimum. Startup times improved appropriately.
4673 * Support for the new Linux/x86 system call interface was added. The
4674 AT_SYSINFO auxiliary vector entry is recognized and handled.
4678 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4681 * iconv (the program and the interface) now accepts empty names (excluding
4682 options like //TRANSLIT) to mean "use charset of current locale".
4684 * localedef can now transliterate characters in strings which are not in
4685 the provided charmap. The information from the input locale is used.
4687 * Prelinking support was added for ELF targets. This requires additional
4688 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
4690 * Read-only stdio streams now use mmap to speed up operation by eliminating
4691 copying and buffer underflows. To use add 'm' to the mode string of
4692 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
4694 * The malloc functions were completely rewritten by Wolfram Gloger based
4695 on Doug Lea's malloc-2.7.0.c.
4697 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4698 implementation of regex.
4700 * Bruno Haible upgraded the iconv and locale implementation to support
4703 * Contents of the LC_* and LANG environment variables in the CEN style are
4704 not recognized anymore. It never was used. Change by Ulrich Drepper.
4706 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4707 thread-local storage (TLS) ABI on some platforms.
4708 Changes by Ulrich Drepper. SH support by Kaz Kojima.
4710 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4711 EUC-JISX0213, and TSCII.
4713 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4714 BSD-compatible interface for getting all network interface addresses.
4715 Implementation for IPv4 by Roland McGrath.
4717 * Loading of locale data is faster due to the introduction of a locale
4718 archive. Implemented by Roland McGrath and Ulrich Drepper.
4720 * Startup times are significantly reduced by not using exported functions
4721 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
4724 * Steven Munroe contributed a port to PowerPC64/Linux.
4728 * The Hurd now uses the GNU libio implementation of stdio rather than the
4729 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4731 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4732 with the same behavior as the Linux system call of the same name.
4736 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4737 128-bit long double format.
4739 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4740 IBM1161, and IBM1162 charsets.
4742 * Andreas Jaeger contributed a port to x86-64/Linux.
4744 * Peter Bruin contributed a port to PowerPC/Hurd.
4746 * libc functions using I/O streams now can handle wide-oriented streams
4749 * optimizations in the dynamic linker. Binaries created by recent binutils
4750 versions start up quicker due to reduced time spent on relocations.
4752 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
4756 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
4757 asinh, atanh, j0 for the 128-bit long double format.
4759 * Bruno Haible updated all the code handling Unicode in some form to
4760 support Unicode 3.1.
4762 * Speed of regex for single-byte locales is back to previous levels.
4763 Patch by Isamu Hasegawa.
4765 * Alpha, SPARC, and IA-64 now also using floating stacks.
4767 * Startup time of internationalized applications greatly improved through
4768 iconv cache. Use iconvconfig to generate the cache file.
4769 Contributed by Ulrich Drepper.
4771 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
4772 severe performance problems. Patch by David Mosberger.
4774 * The Hurd port got a lot more functionality like AIO, various stdio
4775 extensions, etc. Mainly done by Roland McGrath.
4777 * mtrace can now lookup symbols in shared libraries.
4781 * Intel's IA-64 math library is largely integrated. It provides fast and
4782 accurate implementatations for most basic and standard math functions
4783 in float, double, and long double format.
4785 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
4786 and asin for the 96-bit long double format and asin, log, tan for the
4787 128-bit long double format.
4789 * The beginning of a last-bit accurate math library by IBM Haifa were added.
4790 The basic double functions exist today. Contributed by Abraham Ziv
4791 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
4792 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
4794 * An asynchronous name lookup library was added. The interface is designed
4795 after POSIX AIO. The proposal was circulated beforehand to get comments.
4796 No negative ones came in. Implemented by Ulrich Drepper.
4798 * Port to S390/64bit contributed by Martin Schwidefsky
4799 <schwidefsky@de.ibm.com>.
4801 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
4802 of functions for Linux/IA-64.
4804 * The RPC code is now thread safe. Threads can now use the same service
4805 of different services at the same time. Patch by Eric Norum
4806 <eric.norum@usask.ca> with some help by Ulrich Drepper.
4808 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
4809 family of functions for Linux/S390.
4811 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
4812 of functions for Linux/x86.
4814 * Port to Linux/CRIS contributed by Axis Communications.
4818 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
4819 we can now check for namespace violations and missing declarations. The
4820 result is that almost all headers are now Unix-compliant (as defined in
4821 the upcoming XPG6). The negative side is that some programs might need
4822 corrections, too, if they depend on the incorrect form of the headers in
4823 previous versions which defined too many symbols and included too many
4826 * regex now handles multibyte character sets correctly.
4827 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
4829 * iconv (the program) does now conform to the upcoming XPG6 and handles
4830 charmaps. Instead of the charset names the path of charmaps can be
4831 provided and the conversion happens based on this data.
4832 Contributed by Ulrich Drepper.
4834 * The locale program now provides detailed information about the installed
4839 only lists the names of the supported locales
4843 provides details such as country, language, and codeset name.
4844 Contributed by Ulrich Drepper.
4848 * The gencat program now parses the input file according to the charset
4849 selected by the LC_CTYPE category. This is important for stateful
4850 character sets. To make generating catalogs easier there is a way
4851 to overwrite the charset selected by the locale: before the first
4852 message or $ quote line the catalog can contain a line like
4854 $ codeset=ISO-8859-2
4856 to select the charset (ISO-8859-2 in this case).
4858 Implemented by Shinya Hanataka and Ulrich Drepper.
4860 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
4861 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
4862 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
4864 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
4865 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
4867 * The LANGUAGE environment variable is now ignored unless the locale is
4868 changed from the default "C" locale.
4870 * The usual bug fixes.
4874 * Greg McGary added runtime support for bounds checking using gcc's
4875 new -fbounded-pointers option. ix86 target is complete. PowerPC
4878 * Thorsten Kukuk added secure mode support to nscd.
4880 * The Berkeley db libraries have been removed.
4882 Related, the nss_db module is now in a separate package since it
4883 obviously requires a database library being available.
4885 * Wide character I/O streams implemented by Ulrich Drepper.
4887 * Functions from the extended socket API added by Ulrich Drepper.
4889 * Functions feenableexcept and fedisableexcept to control the
4890 behaviour of individual exceptions have been added by Andreas Jaeger.
4892 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
4894 * The resolver code has been updated from bind 8.2.3-T5B which supports
4895 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
4898 This change could in some situations effect backward compatibility. Since
4899 now `_res' is a thread-local instead of a global variable, modifying it
4900 in one thread does not have any effect in other threads.
4902 The resolver library was also extended to allow IPv6 as the transport
4903 protocol for the requests. This work was done by Stig Venaas.
4905 * Compatibility code for K&R C compilers has been removed from the
4906 header files. A ISO C compiler is needed to use the library
4907 (conforming to either C89 or C99 standard).
4909 * Complete rewrite of the localedef program to support multibyte character
4910 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
4911 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
4912 Implemented by Ulrich Drepper.
4914 Bruno Haible significantly improved the generation and use of the data
4915 structures for the wide character tables.
4917 * Plural handling in gettext implemented by Ulrich Drepper.
4919 * The utmp daemon has been removed.
4921 * The port to MIPS-Linux has been finished by Andreas Jaeger.
4923 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
4926 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
4928 * POSIX barriers implemented by Kaz Kylheku.
4930 * POSIX spawn function family implemented by Ulrich Drepper.
4932 * POSIX spinlocks are now available.
4934 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
4936 * the configure option --enable-kernel=X.Y.Z allows to strip out
4937 compatibility for kernel versions before X.Y.Z. This is currently only
4938 implemented for Linux.
4940 * the sockaddr_in6 structure changed. The IPv6 working group added a new
4941 field sin6_scope_id. This means that all programs using IPv6 should be
4942 recompiled. Don't expect binary compatibility with previous glibc
4945 * various conversion modules for IBM character sets contributed by
4948 * IA-64 port by Jes Sorensen and HJ Lu.
4962 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
4964 * New xdr functions are added; some rpc functions are now 64bit clean.
4966 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
4968 * Fixed known incompatibilities with glibc 2.0.
4970 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
4972 * Optimized a number of functions (especially the ELF dynamic loader).
4974 * Update timezone data files.
4976 * lots of charmaps corrections
4978 * some new locale definitions and charmaps
4983 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
4984 conform to POSIX member type requirements. Symbol versions have been
4985 adjusted as needed within the library, and for direct use by applications,
4986 but there is potential for problems if third-party libraries use
4987 struct timeval as part of their interface. This does not present
4988 a problem for X and other "essential" system libraries.
4990 * An additional locale model to support C++ Standard Library locale
4991 model and probably more was implemented by Ulrich Drepper.
4993 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
4996 * Miles Bader provided the `argp' function family to support hierachical
4997 command line argument parsing, layered on top of getopt.
4999 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5001 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5004 * scanf recognizes the %a and %A format for scanning floating point numbers.
5006 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5007 information and interfaces for the available integer types.
5009 * about 130 new math functions were added to implement the ISO C9x math
5012 * the new header <complex.h> contains definitions of the complex math
5013 functions from ISO C 9X.
5015 * the new header <tgmath.h> defines generic macros to use complex or
5016 real valued functions.
5018 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5020 * Andreas Jaeger provided a test suite for the math library.
5022 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5024 * Ulrich Drepper added character set conversion functions (iconv).
5026 * Optimized string functions have been added.
5028 * The localedata addon is now part of glibc.
5030 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5032 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5033 daemon for NSS (nscd).
5035 Missing a better place here are some numbers on improvements. Under
5036 Linux 2.1.125 un-tar-ing the kernel sources takes
5040 using local files 12.19s 6.88s 22.91s
5042 using NIS 13.92s 8.91s 26.34s
5044 using NIS & nscd 10.37s 7.34s 25.30s
5046 using NIS+ 27.57s 30.37s 640.46s
5048 using NIS+ & nscd 10.25s 7.83s 26.51s
5050 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5052 Keep in mind that non-namelookup related operations dominate above times.
5053 It was just a common complain that using NIS+ unpacking the kernel is
5056 [1] The old nscd implementation is not available anymore since it was
5057 distributed with glibc up to version 2.0.98 and thus is now replaced.
5059 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5061 * Mark Kettenis provided a Hesiod NSS module.
5063 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5064 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5066 * rcmd can now handle netgroups (Dick Streefland).
5068 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5071 * Support for the IPv6 protocol has been added to the socket API, as per the
5072 latest draft standards.
5074 * Support for Linux 2.2 has been added.
5076 * Interface changes relative to the latest 2.0.x release:
5077 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5078 addseverity NEW: Unix98
5079 alphasort64 NEW: LFS
5080 argp_err_exit_status NEW: argp, GNU ext
5081 argp_error NEW: argp, GNU ext
5082 argp_failure NEW: argp, GNU ext
5083 argp_help NEW: argp, GNU ext
5084 argp_parse NEW: argp, GNU ext
5085 argp_program_bug_address NEW: argp, GNU ext
5086 argp_program_version NEW: argp, GNU ext
5087 argp_program_version_hook NEW: argp, GNU ext
5088 argp_state_help NEW: argp, GNU ext
5089 argp_usage NEW: argp, GNU ext
5090 authdes_create NEW: Secure RPC
5091 authdes_getucred NEW: Secure RPC
5092 authdes_pk_create NEW: Secure RPC
5093 backtrace NEW: GNU ext.
5094 backtrace_symbols NEW: GNU ext.
5095 backtrace_symbols_fd NEW: GNU ext.
5097 cacosf NEW: ISO C 9x
5098 cacosh NEW: ISO C 9x
5099 cacoshf NEW: ISO C 9x
5100 cacoshl NEW: ISO C 9x
5101 cacosl NEW: ISO C 9x
5108 casinf NEW: ISO C 9x
5109 casinh NEW: ISO C 9x
5110 casinhf NEW: ISO C 9x
5111 casinhl NEW: ISO C 9x
5112 casinl NEW: ISO C 9x
5114 catanf NEW: ISO C 9x
5115 catanh NEW: ISO C 9x
5116 catanhf NEW: ISO C 9x
5117 catanhl NEW: ISO C 9x
5118 catanl NEW: ISO C 9x
5119 cbc_crypt NEW: Secure RPC
5123 ccoshf NEW: ISO C 9x
5124 ccoshl NEW: ISO C 9x
5130 cimagf NEW: ISO C 9x
5131 cimagl NEW: ISO C 9x
5132 clearerr_locked REMOVED
5133 clntunix_create NEW: sunrpc ext
5135 clog10 NEW: ISO C 9x
5136 clog10f NEW: ISO C 9x
5137 clog10l NEW: ISO C 9x
5147 cprojf NEW: ISO C 9x
5148 cprojl NEW: ISO C 9x
5150 crealf NEW: ISO C 9x
5151 creall NEW: ISO C 9x
5156 csinhf NEW: ISO C 9x
5157 csinhl NEW: ISO C 9x
5160 csqrtf NEW: ISO C 9x
5161 csqrtl NEW: ISO C 9x
5165 ctanhf NEW: ISO C 9x
5166 ctanhl NEW: ISO C 9x
5168 des_setparity NEW: Secure RPC
5169 ecb_crypt NEW: Secure RPC
5170 endutxent NEW: Unix98
5172 exp10f NEW: ISO C 9x
5173 exp10l NEW: ISO C 9x
5177 fattach NEW: STREAMS
5178 fdetach NEW: STREAMS
5182 feclearexcept NEW: ISO C 9x
5183 fegetenv NEW: ISO C 9x
5184 fegetexceptflag NEW: ISO C 9x
5185 fegetround NEW: ISO C 9x
5186 feholdexcept NEW: ISO C 9x
5188 feraiseexcept NEW: ISO C 9x
5189 ferror_locked REMOVED
5190 fesetenv NEW: ISO C 9x
5191 fesetexceptflag NEW: ISO C 9x
5192 fesetround NEW: ISO C 9x
5193 fetestexcept NEW: ISO C 9x
5194 feupdateenv NEW: ISO C 9x
5195 fflush_locked REMOVED
5199 fgets_unlocked NEW: GNU ext.
5200 fileno_locked REMOVED
5212 fputc_locked REMOVED
5213 fputs_unlocked NEW: GNU ext.
5214 fread_unlocked NEW: GNU ext.
5219 fstatvfs NEW: Unix98
5223 ftruncate64 NEW: LFS
5225 fwrite_unlocked NEW: GNU ext.
5226 gai_strerror NEW: IPv6
5230 getchar_locked REMOVED
5232 getdate_err NEW: Unix98
5233 getdate_r NEW: GNU ext.
5235 getnameinfo NEW: IPv6
5236 getnetname NEW: Secure RPC
5237 getpmsg NEW: STREAMS
5238 getpt NEW: Unix98 PTY
5239 getrlimit64 NEW: LFS
5240 getutxent NEW: Unix98
5241 getutxid NEW: Unix98
5242 getutxline NEW: Unix98
5243 glob64 NEW: GNU ext.
5244 globfree64 NEW: GNU ext.
5245 gnu_get_libc_release NEW: GNU ext.
5246 gnu_get_libc_version NEW: GNU ext.
5247 grantpt NEW: Unix98 PTY
5248 host2netname NEW: Secure RPC
5250 iconv_close NEW: iconv
5251 iconv_open NEW: iconv
5252 if_freenameindex NEW: IPv6
5253 if_indextoname NEW: IPv6
5254 if_nameindex NEW: IPv6
5255 if_nametoindex NEW: IPv6
5256 in6addr_any NEW: IPv6
5257 in6addr_loopback NEW: IPv6
5258 inet6_isipv4mapped NEW: IPv6
5259 isastream NEW: STREAMS
5260 iswblank NEW: GNU ext.
5261 key_decryptsession NEW: Secure RPC
5262 key_decryptsession_pk NEW: Secure RPC
5263 key_encryptsession NEW: Secure RPC
5264 key_encryptsession_pk NEW: Secure RPC
5265 key_gendes NEW: Secure RPC
5266 key_get_conv NEW: Secure RPC
5267 key_secretkey_is_set NEW: Secure RPC
5268 key_setnet NEW: Secure RPC
5269 key_setsecret NEW: Secure RPC
5270 llrint NEW: ISO C 9x
5271 llrintf NEW: ISO C 9x
5272 llrintl NEW: ISO C 9x
5273 llround NEW: ISO C 9x
5274 llroundf NEW: ISO C 9x
5275 llroundl NEW: ISO C 9x
5280 lrintf NEW: ISO C 9x
5281 lrintl NEW: ISO C 9x
5282 lround NEW: ISO C 9x
5283 lroundf NEW: ISO C 9x
5284 lroundl NEW: ISO C 9x
5286 makecontext NEW: Unix98
5287 mempcpy NEW: GNU ext.
5290 modify_ldt NEW: kernel
5294 nearbyint NEW: ISO C 9x
5295 nearbyintf NEW: ISO C 9x
5296 nearbyintl NEW: ISO C 9x
5297 netname2host NEW: Secure RPC
5298 netname2user NEW: Secure RPC
5299 nexttoward NEW: ISO C 9x
5300 nexttowardf NEW: ISO C 9x
5301 nexttowardl NEW: ISO C 9x
5305 passwd2des NEW: Secure RPC
5307 pow10f NEW: GNU ext.
5308 pow10l NEW: GNU ext.
5311 printf_size NEW: GNU ext.
5312 printf_size_info NEW: GNU ext.
5313 profil_counter REMOVED
5314 pthread_mutexattr_getkind_np REPLACED
5315 pthread_mutexattr_setkind_np REPLACED
5316 ptsname NEW: Unix98 PTY
5317 ptsname_r NEW: Unix98 PTY
5319 putchar_locked REMOVED
5320 putgrent NEW: GNU ext.
5322 putpmsg NEW: STREAMS
5323 pututxline NEW: Unix98
5327 readdir64_r NEW: LFS
5328 remquo NEW: ISO C 9x
5329 remquof NEW: ISO C 9x
5330 remquol NEW: ISO C 9x
5332 roundf NEW: ISO C 9x
5333 roundl NEW: ISO C 9x
5335 scalbln NEW: ISO C 9x
5336 scalblnf NEW: ISO C 9x
5337 scalblnl NEW: ISO C 9x
5339 sendfile NEW: kernel
5340 setcontext NEW: Unix98
5341 setrlimit64 NEW: LFS
5342 setutxent NEW: Unix98
5344 sigignore NEW: Unix98
5345 sigqueue NEW: POSIX.1b
5346 sigrelse NEW: Unix98
5347 sigset NEW: POSIX.1b
5348 sigtimedwait NEW: POSIX.1b
5349 sigwaitinfo NEW: POSIX.1b
5350 sincos NEW: GNU ext.
5351 sincosf NEW: GNU ext.
5352 sincosl NEW: GNU ext.
5356 strcasestr NEW: GNU ext.
5357 strtoimax NEW: ISO C 9x
5358 strtoumax NEW: ISO C 9x
5359 strverscmp NEW: GNU ext.
5360 svcauthdes_stats NEW: Secure RPC
5361 svcunix_create NEW: sunrpc etx
5362 svcunixfd_create NEW: sunrpc ext
5363 swapcontext NEW: Unix98
5364 tcgetsid NEW: Unix98 PTY
5365 tdestroy NEW: GNU ext.
5366 tgamma NEW: ISO C 9x
5367 tgammaf NEW: ISO C 9x
5368 tgammal NEW: ISO C 9x
5372 truncf NEW: ISO C 9x
5373 truncl NEW: ISO C 9x
5375 unlockpt NEW: Unix98 PTY
5376 updwtmpx NEW: Unix98
5377 user2netname NEW: Secure RPC
5378 utmpxname NEW: Unix98
5379 versionsort NEW: GNU ext.
5380 versionsort64 NEW: GNU ext.
5382 wcscasecmp NEW: GNU ext.
5383 wcsncasecmp NEW: GNU ext.
5384 wcsnlen NEW: GNU ext.
5385 wcstoimax NEW: ISO C 9x
5386 wcstoll NEW: ISO C 9x
5387 wcstoull NEW: ISO C 9x
5388 wcstoumax NEW: ISO C 9x
5390 wordexp NEW: POSIX.2
5391 wordfree NEW: POSIX.2
5392 write_profiling REMOVED
5393 xdecrypt NEW: Secure RPC
5394 xdr_authdes_cred NEW: Secure RPC
5395 xdr_authdes_verf NEW: Secure RPC
5396 xdr_cryptkeyarg NEW: Secure RPC
5397 xdr_cryptkeyarg2 NEW: Secure RPC
5398 xdr_cryptkeyres NEW: Secure RPC
5399 xdr_getcredres NEW: Secure RPC
5400 xdr_key_netstarg NEW: Secure RPC
5401 xdr_key_netstres NEW: Secure RPC
5402 xdr_keybuf NEW: Secure RPC
5403 xdr_keystatus NEW: Secure RPC
5404 xdr_netnamestr NEW: Secure RPC
5405 xdr_sizeof NEW: Secure RPC
5406 xdr_unixcred NEW: sunrpc ext
5407 xencrypt NEW: Secure RPC
5408 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5419 * inet_ntoa is thread-safe
5421 * updwtmp is moved from libutil to libc
5423 * rewrite of cbrt function
5425 * update of timezone data
5439 * add atoll function
5441 * fix complex problems in Berkeley DB code
5443 * fix math functions
5447 * fixed lots of header problems (especially Linux/GNU specific)
5449 * dynamic loader preserves all registers
5451 * Roland McGrath provided support for handling of auxiliary objects in
5452 the ELF dynamic loader.
5454 * support for parallel builds is improved
5458 * GNU extensions are no longer declared by default. To enable them you
5459 must define the macro `_GNU_SOURCE' in your program or compile with
5462 * The library has changed from using GNU ld symbol aliases to using weak
5463 symbols where available. The ELF object file format supports weak
5464 symbols; GNU ld also supports weak symbols in the a.out format. (There
5465 is also now support for other GNU ld extensions in ELF. Use the
5466 `--with-elf' option to configure to indicate you have ELF, and
5467 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5468 of many files which contained only symbol aliases, reducing the size of
5469 the source and the compiled library; many other files were renamed to
5470 less cryptic names previously occupied by the symbol alias files.
5471 There is a new header file <elf.h> for programs which operate on
5472 files in the ELF format.
5474 * Converted to Autoconf version 2, so `configure' has more options.
5475 Run `configure --help' to see the details.
5477 * The library can now be configured to build profiling, highly-optimized
5478 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5479 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5480 `configure' enable building these extra libraries. The shared library is
5481 built by default when using both ELF and GNU ld. When shared libraries
5482 are enabled, the new library `-ldl' is available for arbitrary run-time
5483 loading of shared objects; its interface is defined in <dlfcn.h>. The
5484 new header file <link.h> gives access to the internals of the run-time
5485 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5486 application of same name on other systems and it provides information
5487 about dynamically linked binaries.
5489 * The C library now provides the run-time support code for profiling
5490 executables compiled with `-pg'. Programs can control the profiling code
5491 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5492 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5493 the support for this file format was contributed by David Mosberger-Tang.
5495 * The math code has been replaced with a math library based on fdlibm from
5496 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5497 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5498 functions. The math functions now reside in a separate library, so
5499 programs using them will need to use `-lm' their linking commands.
5501 * John C. Bowman contributed optimized ix87 assembler inline functions.
5503 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5504 mechanism similar to that found in Solaris 2. This is now used for the
5505 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5506 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5507 file controls what services are used for each individual database. This
5508 works by loading shared libraries with names specified in `nsswitch.conf',
5509 so service modules can be changed or added at any time without even
5510 relinking any program. Currently there are the file, db, and NIS based
5511 NSS services available.
5513 * The new functions `strtoq' and `strtouq' parse integer values from
5514 strings, like `strtol' and `strtoul', but they return `long long int' and
5515 `unsigned long long int' values, respectively (64-bit quantities).
5517 * The new functions `strtof' and `strtold' parse floating-point values from
5518 strings, like `strtod', but they return `float' and `long double' values,
5519 respectively (on some machines `double' and `long double' are the same).
5521 * Ulrich Drepper has contributed new implementations of the floating-point
5522 printing and reading code used in the `printf' family of functions and
5523 `strtod', `strtof', and `strtold'. These new functions are perfectly
5524 accurate, and much faster than the old ones.
5526 * The implementation of the POSIX locale model was completely rewritten by
5527 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5528 to compile the POSIX locale definition.
5530 * The former dummy implementations of the strcoll and strxfrm function are
5531 now replaced by fully functional code contributed by Ulrich Drepper. The
5532 collation information comes from the POSIX locale definitions.
5534 * The new header <langinfo.h> defines an interface for accessing
5535 various locale-dependent data (using the locale chosen with `setlocale').
5537 * Ulrich Drepper has contributed a new suite of functions for operation on
5538 wide-character and multibyte-character strings, in <wchar.h>;
5539 and classification and case conversion of wide characters, in <wctype.h>.
5540 These new functions are conforming to the ISO C, Amendement 1 specification.
5542 * There is now a second implementation of the standard I/O library available.
5543 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5544 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5546 * You can now use positional parameter specifications in format strings
5547 for the `printf' and `scanf' families of functions. For example,
5548 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5549 ``Number 6, Mr Jones''. This is mainly useful when providing different
5550 format strings for different languages, whose grammars may dictate
5551 different orderings of the values being printed. To support this
5552 feature, the interface for `register_printf_handler' has changed; see
5553 the header file <printf.h> for details.
5555 * The `printf' and `scanf' families of functions now understand a new
5556 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5557 to group numbers as indicated by the locale; for `scanf' and friends, this
5558 says to accept as valid only a number with all the proper grouping
5559 separators in the right places. In the default "C" locale, numbers are
5560 not grouped; but locales for specific countries will define the usual
5561 conventions (i.e. separate thousands with `,' in the US locale).
5563 * The pgrp functions have been regularized, slightly incompatibly but much
5564 less confusingly. The core functions are now `getpgid' and `setpgid',
5565 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5566 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5567 provided for compatibility. There is no longer an incompatible `getpgrp'
5568 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5570 * The new header file <fts.h> and suite of functions simplify programs that
5571 operate on directory trees. This code comes from 4.4 BSD.
5573 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5574 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5575 NSS scheme used in glibc.
5577 * There is a new malloc debugging hook `__memalign_hook'.
5579 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5580 `unsigned int' in <sys/types.h>. These are for compatibility only and
5581 their use is discouraged.
5583 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5584 done differently, so that it works even without GNU ld.
5586 * New function `euidaccess' checks allowed access to a file like `access',
5587 but using the effective IDs instead of the real IDs.
5589 * The time zone data files have been updated for the latest and greatest
5590 local time conventions of the countries of the world.
5592 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5595 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5596 for formatting floating-point numbers. They are provided only for
5597 compatibility; new programs should use `sprintf' instead. There are
5598 also equivalent function for the `long double' floating-point type and
5599 all functions also exist in a reentrant form.
5601 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5602 functions for maintaining the login-record files (primarily of use to
5603 system programs such as `login'), and convenient functions for
5604 allocating and initializing a pseudo-terminal (pty) device.
5606 * Ulrich Drepper has contributed new support for System V style
5607 shared memory and IPC on systems that support it.
5609 * Ulrich Drepper has contributed several miscellaneous new functions found
5610 in System V: The `hsearch' family of functions provide an effective
5611 implementation of hash tables; `a64l' and `l64a' provide a very simple
5612 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5615 * Ulrich Drepper has contributed new reentrant counterparts for the
5616 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5618 * Ulrich Drepper has contributed new, highly-optimized versions of several
5619 string functions for the i486/Pentium family of processors.
5621 * Ulrich Drepper has updated the Linux-specific code, based largely
5622 on work done in Hongjiu Lu's version of GNU libc for Linux.
5623 The GNU library now supports Linux versions 2.0.10 and later,
5624 using the ELF object file format (i[3456]86-*-linux).
5626 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5628 * David Mosberger-Tang and Richard Henderson have ported the C library
5629 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
5630 dynamic linking support for ELF/Alpha.
5632 * Richard Henderson contributed several Alpha optimized assembler function
5633 for arithmetic and string handling.
5635 * Ulrich Drepper has contributed a new set of message catalog functions to
5636 support multiple languages using the <libintl.h> interface, for use with
5637 his new package GNU gettext. Translation volunteers have contributed
5638 catalogs of the library's messages in Spanish, German, and Korean.
5640 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5641 program and the `catgets' function for reading the catalog files it
5642 creates. (The <libintl.h> interface is preferred; we include the
5643 <nl_types.h> interface using `catgets' only for source compatibility with
5644 programs already written to use it.)
5646 * New header file <values.h> gives SVID-compatible names for <limits.h>
5649 * Various new macros, declarations, and small header files for compatibility
5652 * New function `group_member' is a convenient way to check if a process has
5653 a given effective group ID.
5655 * When using GCC 2.7 and later, the socket functions are now declared in a
5656 special way so that passing an argument of type `struct sockaddr_in *',
5657 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5658 `struct sockaddr *' type, does not generate a type-clash warning.
5660 * New function `error' declared in header file <error.h> is a convenient
5661 function for printing error messages and optionally exiting; this is the
5662 canonical function used in GNU programs. The new functions `err', `warn',
5663 and friends in header file <err.h> are the canonical 4.4 BSD interface for
5664 doing the same thing.
5666 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5667 POSIX.2 `glob' function to do ~ and {...} expansion.
5669 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5670 `clearenv' which is used in POSIX.9 is also available.
5672 * New function `getsid' returns session ID number on systems that support it.
5674 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
5675 files <db.h> and <mpool.h> provide a rich set of functions for several
5676 types of simple databases stored in memory and in files, and <ndbm.h> is
5677 an old `ndbm'-compatible interface using the `db' functions. Link with
5678 `-ldb' to get these functions.
5680 * New macro `strdupa' copies a string like `strdup', but uses local stack
5681 space from `alloca' instead of dynamic heap space from `malloc'.
5683 * New function `strnlen' is like `strlen' but searches only a given maximum
5684 number of characters for the null terminator. `stpncpy', `strndup' and
5685 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5688 * New function `statfs' in header <sys/statfs.h>.
5690 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5691 provide convenient functions for operating on blocks of null-terminated
5694 * A new suite of functions in <utmp.h> handle all the details of reading
5695 and writing the utmp file.
5697 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5700 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5701 completely POSIX compliant and also implemented the extended functionality
5702 to handle alternate digit representation and alternate era date formats.
5704 * Ulrich Drepper provided an implementation of the `strptime' function
5705 defined in XPG4.2 which transforms a string into a `struct tm' value.
5707 * Paul Eggert provided the tzselect shell script as part of the timezone
5708 code. The shell script makes it easy to select the correct timezone
5711 * The implementation of the malloc family of functions is completely replaced
5712 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5713 The implementation uses the mmap function (if available) and it is
5714 optimized for the use in multi threaded programs.
5716 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5717 functions. This new functionality is usable by specifying a special
5718 salt string and it is compatible with implementation on *BSD systems.
5720 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5721 `getsubopt' to handle second level command line options, `bsd_signal'
5722 to access BSD style `signal' functionality, the obsolete `regexp' style
5725 * the `lchown' function is available on system which support this
5728 * The implementation of the shadow password handling function was contributed
5731 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5733 * POSIX.1g support was added. The <sys/select.h> header is available,
5734 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
5735 implementation of `getaddrinfo'.
5739 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5741 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5742 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
5744 * The new function `daemon' from 4.4 BSD is useful for server programs that
5745 want to put themselves in the background.
5747 * Joel Sherrill has contributed support for several standalone boards that
5748 run without an operating system.
5750 * `printf', `scanf' and friends now accept a `q' type modifier for long
5751 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
5753 * All of the code taken from BSD (notably most of the math and networking
5754 routines) has been updated from the BSD 4.4-Lite release.
5756 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
5758 * The new functions `getdomainname' and `setdomainname' fetch or change the
5759 YP/NIS domain name. These are system calls which exist on systems which
5762 * The time zone data files have been updated for the latest international
5765 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
5766 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
5770 * The C library now includes support for Sun RPC, from Sun's free
5771 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
5772 are included. (There is still no support for YP.)
5774 * Tom Quinn has contributed a port of the C library to SGI machines running
5775 Irix 4 (mips-sgi-irix4).
5777 * The new `lockf' function is a simplified interface to the locking
5778 facilities of `fcntl', included for compatibility.
5780 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
5782 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
5784 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
5787 * The error message printed by `assert' for a failed assertion now includes
5788 the name of the program (if using GNU ld) and the name of the calling
5789 function (with versions of GCC that support this).
5791 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
5793 * The library now includes the <sys/mman.h> header file and memory
5794 management functions `mmap', `munmap', `mprotect', `msync', and
5795 `madvise', on systems that support those facilities.
5797 * The interface for `mcheck' has changed slightly: the function called to
5798 abort the program when an allocation inconsistency is detected now takes
5799 an argument that indicates the type of failure. The new function
5800 `mprobe' lets you request a consistency check for a particular block at
5801 any time (checks are normally done only when you call `free' or `realloc'
5804 * It is now possible to easily cross-compile the C library, building on one
5805 system a library to run on another machine and/or operating system. All
5806 you need to do is set the variable `HOST_CC' in `configparms' to the
5807 native compiler for programs to run on the machine you are building on (a
5808 few generator programs are used on Unix systems); set `CC' to the
5811 * The new function `fexecve' (only implemented on the GNU system) executes
5812 a program file given a file descriptor already open on the file.
5816 * Brendan Kehoe has contributed most of a port to the DEC Alpha
5817 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
5819 * You can set the variable `libprefix' in `configparms' to specify a prefix
5820 to be prepended to installed library files; this makes it easy to install
5821 the GNU C library to be linked as `-lgnuc' or whatever.
5823 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
5824 copies a limited number of characters from a string, and returns the
5825 address of the last character written.
5827 * You no longer need to check for whether the installed `stddef.h' is
5828 compatible with the GNU C library. configure now checks for you.
5830 * You can now define a per-stream `fileno' function to convert the
5831 stream's cookie into an integral file descriptor.
5833 * ``malloc (0)'' no longer returns a null pointer. Instead, it
5834 allocates zero bytes of storage, and returns a unique pointer which
5835 you can pass to `realloc' or `free'. The behavior is undefined if
5836 you dereference this pointer.
5838 * The C library now runs on Sony NEWS m68k machines running either
5839 NewsOS 3 or NewsOS 4.
5841 * The new `syscall' function is a system-dependent primitive function
5842 for invoking system calls. It has the canonical behavior on Unix
5843 systems, including unreliable return values for some calls (such as
5844 `pipe', `fork' and `getppid').
5846 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
5847 to `EAGAIN', which is the preferred name. On systems whose kernels
5848 use two distinct codes, the C library now translates EWOULDBLOCK to
5849 EAGAIN in every system call function.
5853 * The GNU C Library Reference Manual is now distributed with the library.
5854 `make dvi' will produce a DVI file of the printed manual.
5855 `make info' will produce Info files that you can read on line using C-h i
5856 in Emacs or the `info' program.
5857 Please send comments on the manual to bug-glibc-manual@gnu.org.
5859 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
5861 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
5863 * Jason Merrill has contributed a port to the Sequent Symmetry running
5864 Dynix version 3 (i386-sequent-dynix).
5866 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
5867 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
5869 * New function `memory_warnings' lets you arrange to get warnings when
5870 malloc is running out of memory to allocate, like Emacs gives you.
5872 * The C library now contains the relocating allocator used in Emacs 19 for
5873 its editing buffers. This allocator (ralloc) minimizes allocation
5874 overhead and fragmentation by moving allocated regions around whenever it
5875 needs to. You always refer to a ralloc'd region with a "handle" (a
5876 pointer to a pointer--an object of type `void **').
5878 * There is a new `printf' format: `%m' gives you the string corresponding
5879 to the error code in `errno'.
5881 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
5882 or `%[' conversion, but instead of filling in a fixed-sized buffer you
5883 pass, the `a' modifier says to fill in a `char **' you pass with a
5886 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
5887 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
5888 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
5890 * `mkstemp' is a traditional Unix function to atomically create and open a
5891 uniquely-named temporary file.
5895 * The standard location for the file that says what the local timezone is
5896 has changed again. It is now `/usr/local/etc/localtime' (or more
5897 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
5899 * The distribution no longer contains any files with names longer than 14
5902 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
5903 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
5905 * New functions `ttyslot' and `syslog' from 4.4 BSD.
5909 * The configuration process has changed quite a bit. The `configure'
5910 script is now used just like the configuration scripts for other GNU
5911 packages. The `sysdeps' directory hierarchy is much rearranged.
5912 The file `INSTALL' explains the new scheme in detail.
5914 * The header files no longer need to be processed into ANSI C and
5915 traditional C versions. There is just one set of files to install, and
5916 it will work with ANSI or old C compilers (including `gcc -traditional').
5918 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
5919 MIPS DECStation running Ultrix 4.
5921 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
5922 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
5923 made itself into a shared library.
5925 * Yet further improved support for the i386, running 4.3 BSD-like systems
5926 (such as Mach 3 with the Unix single-server), or System V.
5928 * New function `strncasecmp' to do case-insensitive string comparison
5929 with limited length.
5931 * New function `strsep' is a reentrant alternative to `strtok'.
5933 * New functions `scandir' and `alphasort' for searching directories.
5935 * New function `setenv' is a better interface to `putenv'.
5937 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
5938 function for traversing a directory tree.
5940 * The GNU obstack package is now also part of the C library.
5941 The new function `open_obstack_stream' creates a stdio stream that
5942 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
5943 formatted output directly to an obstack.
5945 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
5946 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
5948 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
5950 * The new functions `strfry' and `memfrob' do mysterious and wonderful
5951 things to your strings.
5953 * There are some new test programs: test-fseek, testmb, and testrand.
5955 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
5956 These ports are not finished, but are a good starting place for really
5957 supporting those systems.
5959 * `/etc/localtime' is now the standard location for the file that says what
5960 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
5961 This follows the general principle that `/etc' is the place for all local
5962 configuration files.
5964 * The C library header files now use `extern "C"' when used by the C++
5965 compiler, so the C library should now work with C++ code.
5967 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
5968 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
5971 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
5972 function which uses the `merge sort' algorithm, and is said to be
5973 significantly faster than the old GNU `qsort' function. Merge sort is
5974 now the standard `qsort' function. The new algorithm can require a lot
5975 of temporary storage; so, the old sorting function is called when the
5976 required storage is not available.
5978 * The C library now includes Michael Glad's Ultra Fast Crypt, which
5979 provides the Unix `crypt' function, plus some other entry points.
5981 * The code and header files taken from 4.4 BSD have been updated with the
5982 latest files released from Berkeley.
5984 ----------------------------------------------------------------------
5985 Copyright information:
5987 Copyright (C) 1992-2020 Free Software Foundation, Inc.
5989 Permission is granted to anyone to make or distribute verbatim copies
5990 of this document as received, in any medium, provided that the
5991 copyright notice and this permission notice are preserved,
5992 thus giving the recipient permission to redistribute in turn.
5994 Permission is granted to distribute modified versions
5995 of this document, or of portions of it,
5996 under the above conditions, provided also that they
5997 carry prominent notices stating who last changed them.
6000 version-control: never