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 * Remove configure option --enable-obsolete-nsl. libnsl is only built
84 as shared library for backward compatibility and the NSS modules "nis"
85 and "nisplus" are not built at all and libnsl's headers aren't
86 installed. This compatibility is kept only for architectures and ABIs
87 that have been added in or before version 2.28. Replacement
88 implementations based on TI-RPC, which additionally support IPv6, are
89 available from <https://github.com/thkukuk/>. This change does not
90 affect the "compat" NSS module, which does not depended on libnsl
91 since 2.27 and thus can be used without NIS.
93 * The deprecated <sys/sysctl.h> header and the sysctl function have been
94 removed. To support old binaries, the sysctl function continues to
95 exist as a compatibility symbol (on those architectures which had it),
96 but always fails with ENOSYS. This reflects the removal of the system
97 call from all architectures, starting with Linux 5.5.
99 * The sstk function is no longer available to newly linked binaries.
100 Its implementation always returned with a failure, and the function
101 was not declared in any header file.
103 * The legacy signal handling functions siginterrupt, sigpause, sighold,
104 sigrelse, sigignore and sigset, and the sigmask macro have been
105 deprecated. Applications should use the sigsuspend, sigprocmask and
106 sigaction functions instead.
108 * ldconfig now defaults to the new format for ld.so.cache. glibc has
109 already supported this format for almost 20 years.
111 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
112 are no longer available to newly linked binaries, and their declarations
113 have been removed from <string.h>. They are exported solely as
114 compatibility symbols to support old binaries. All programs should use
117 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
118 are no longer available to newly linked binaries, and their declarations
119 have been removed from from <stdio.h>. They are exported solely as
120 compatibility symbols to support old binaries. All programs should use
121 strerror or strerror_r instead.
123 * Both strerror and strerror_l now share the same internal buffer in the
124 calling thread, meaning that the returned string pointer may be invalided
125 or contents might be overwritten on subsequent calls in the same thread or
126 if the thread is terminated. It makes strerror MT-safe.
128 * The "files" NSS module no longer supports the "key" database (used for
129 secure RPC). The contents of the /etc/publickey file will be ignored,
130 regardless of the settings in /etc/nsswitch.conf. (This method of
131 storing RPC keys only supported the obsolete and insecure AUTH_DES
132 flavor of secure RPC.)
134 Changes to build and runtime requirements:
136 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
137 long double redirects.
139 Security related changes:
141 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
142 corruption when they were passed a pseudo-zero argument. Reported by Guido
143 Vranken / ForAllSecure Mayhem.
145 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
146 out-of-bounds write when executed in a signal frame context.
148 CVE-2020-1752: A use-after-free vulnerability in the glob function when
149 expanding ~user has been fixed.
151 The following bugs are resolved with this release:
153 [The release manager will add the list generated by
154 scripts/list-fixed-bugs.py just before the release.]
160 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
161 enable features from the draft ISO C2X standard. Only some features from
162 this draft standard are supported by the GNU C Library, and as the draft
163 is under active development, the set of features enabled by this macro is
164 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
165 by compiling with "gcc -std=gnu2x".
167 * The <math.h> functions that round their results to a narrower type now
168 have corresponding type-generic macros in <tgmath.h>, as defined in TS
169 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
170 Clarification Request 13 to TS 18661-3.
172 * The function pthread_clockjoin_np has been added, enabling join with a
173 terminated thread with a specific clock. It allows waiting against
174 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
176 * New locale added: mnw_MM (Mon language spoken in Myanmar).
178 * The DNS stub resolver will optionally send the AD (authenticated data) bit
179 in queries if the trust-ad option is set via the options directive in
180 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
181 mode, the AD bit, as provided by the name server, is available to
182 applications which call res_search and related functions. In the default
183 mode, the AD bit is not set in queries, and it is automatically cleared in
184 responses, indicating a lack of DNSSEC validation. (Therefore, the name
185 servers and the network path to them are treated as untrusted.)
187 Deprecated and removed features, and other changes affecting compatibility:
189 * The totalorder and totalordermag functions, and the corresponding
190 functions for other floating-point types, now take pointer arguments to
191 avoid signaling NaNs possibly being converted to quiet NaNs in argument
192 passing. This is in accordance with the resolution of Clarification
193 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
194 floating-point arguments directly will continue to work.
196 * The obsolete function stime is no longer available to newly linked
197 binaries, and its declaration has been removed from <time.h>.
198 Programs that set the system time should use clock_settime instead.
200 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
201 in a future version of glibc. In this release, the header still exists
202 but calling ftime will cause a compiler warning. All programs should use
203 gettimeofday or clock_gettime instead.
205 * The gettimeofday function no longer reports information about a
206 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
207 many years, as it cannot handle the full complexity of the world's
208 timezones, but hitherto we have supported it on a best-effort basis.
209 Changes required to support 64-bit time_t on 32-bit architectures have
210 made this no longer practical.
212 As of this release, callers of gettimeofday with a non-null 'tzp' argument
213 should expect to receive a 'struct timezone' whose tz_minuteswest and
214 tz_dsttime fields are zero. (For efficiency reasons, this does not always
215 happen on a few Linux-based ports. This will be corrected in a future
218 All callers should supply a null pointer for the 'tzp' argument to
219 gettimeofday. For accurate information about the time zone associated
220 with the current time, use the localtime function.
222 gettimeofday itself is obsolescent according to POSIX. We have no plans
223 to remove access to this function, but portable programs should consider
224 using clock_gettime instead.
226 * The settimeofday function can still be used to set a system-wide time
227 zone when the operating system supports it. This is because the Linux
228 kernel reused the API, on some architectures, to describe a system-wide
229 time-zone-like offset between the software clock maintained by the kernel,
230 and the "RTC" clock that keeps time when the system is shut down.
232 However, to reduce the odds of this offset being set by accident,
233 settimeofday can no longer be used to set the time and the offset
234 simultaneously. If both of its two arguments are non-null, the call
235 will fail (setting errno to EINVAL).
237 Callers attempting to set this offset should also be prepared for the call
238 to fail and set errno to ENOSYS; this already happens on the Hurd and on
239 some Linux architectures. The Linux kernel maintainers are discussing a
240 more principled replacement for the reused API. After a replacement
241 becomes available, we will change settimeofday to fail with ENOSYS on all
242 platforms when its 'tzp' argument is not a null pointer.
244 settimeofday itself is obsolescent according to POSIX. Programs that set
245 the system time should use clock_settime and/or the adjtime family of
246 functions instead. We may cease to make settimeofday available to newly
247 linked binaries after there is a replacement for Linux's time-zone-like
250 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
251 the optional CAS instruction is implemented (for instance, LEON processors
252 are still supported, but SuperSPARC processors are not).
254 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
257 * If a lazy binding failure happens during dlopen, during the execution of
258 an ELF constructor, the process is now terminated. Previously, the
259 dynamic loader would return NULL from dlopen, with the lazy binding error
260 captured in a dlerror message. In general, this is unsafe because
261 resetting the stack in an arbitrary function call is not possible.
263 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
264 executable stack unless explicitly configured at build time to require
265 minimum kernel version 4.8 or newer. This is because executing
266 floating-point branches on a non-executable stack on Linux kernels prior to
267 4.8 can lead to application crashes for some MIPS configurations. While
268 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
269 expected to enable non-executable stack by default with PT_GNU_STACK by
270 default and is thus likely to trigger a crash on older kernels.
272 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
273 non-executable stack while dropping support for older kernels.
275 * System call wrappers for time system calls now use the new time64 system
276 calls when available. On 32-bit targets, these wrappers attempt to call
277 the new system calls first and fall back to the older 32-bit time system
278 calls if they are not present. This may cause issues in environments
279 that cannot handle unsupported system calls gracefully by returning
280 -ENOSYS. Seccomp sandboxes are affected by this issue.
282 Changes to build and runtime requirements:
284 * It is no longer necessary to have recent Linux kernel headers to build
285 working (non-stub) system call wrappers on all architectures except 64-bit
286 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
288 * The ChangeLog file is no longer present in the toplevel directory of the
289 source tree. ChangeLog files are located in the ChangeLog.old directory as
290 ChangeLog.N where the highest N has the latest entries.
292 Security related changes:
294 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
295 environment variable during program execution after a security
296 transition, allowing local attackers to restrict the possible mapping
297 addresses for loaded libraries and thus bypass ASLR for a setuid
298 program. Reported by Marcin Kościelnicki.
300 The following bugs are resolved with this release:
302 [12031] localedata: iconv -t ascii//translit with Greek characters
303 [15813] libc: Multiple issues in __gen_tempname
304 [17726] libc: [arm, sparc] profil_counter should be compat symbol
305 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
306 [19767] libc: vdso is not used with static linking
307 [19903] hurd: Shared mappings not being inherited by children processes
308 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
309 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
311 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
312 Symbols-A/B Unicode blocks
313 [23518] libc: Eliminate __libc_utmp_jump_table
314 [24026] malloc: malloc_info() returns wrong numbers
315 [24054] localedata: Many locales are missing date_fmt
316 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
317 [24304] dynamic-link: Lazy binding failure during ELF
318 constructors/destructors is not fatal
319 [24376] libc: RISC-V symbol size confusion with _start
320 [24682] localedata: zh_CN first weekday should be Monday per GB/T
322 [24824] libc: test-in-container does not install charmap files compatible
324 [24844] regex: regex bad pointer / leakage if malloc fails
325 [24867] malloc: Unintended malloc_info formatting changes
326 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
327 [24880] libc: login: utmp implementation uses struct flock with fcntl64
328 [24882] libc: login: pututline uses potentially outdated cache
329 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
330 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
332 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
334 [24930] dynamic-link: dlopen of PIE executable can result in
335 _dl_allocate_tls_init assertion failure
336 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
337 (stringop-overflow error)
338 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
339 functions other can lead to crashes
340 [24967] libc: jemalloc static linking causes runtime failure
341 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
343 [25035] libc: sbrk() failure handled poorly in tunables_strdup
344 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
345 [25097] libc: new -Warray-bounds with GCC 10
346 [25112] dynamic-link: dlopen must not make new objects accessible when it
347 still can fail with an error
348 [25139] localedata: Please add the new mnw_MM locale
349 [25149] regex: Array bounds violation in proceed_next_node
350 [25157] dynamic-link: Audit cookie for the dynamic loader is not
351 initialized correctly
352 [25189] libc: glibc's __glibc_has_include causes issues with clang
354 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
356 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
357 binaries (CVE-2019-19126)
358 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
360 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
362 [25232] string: <string.h> does not enable const correctness for strchr et
364 [25233] localedata: Consider "." as the thousands separator for sl_SI
366 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
367 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
368 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
370 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
371 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
373 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
374 (dl_initfirst) link map pointer
375 [25401] malloc: pvalloc must not have __attribute_alloc_size__
376 [25423] libc: Array overflow in backtrace on powerpc
377 [25425] network: Missing call to __resolv_context_put in
378 getaddrinfo.c:gethosts
385 * Unicode 12.1.0 Support: Character encoding, character type info, and
386 transliteration tables are all updated to Unicode 12.1.0, using
387 generator scripts contributed by Mike FABIAN (Red Hat).
389 * The dynamic linker accepts the --preload argument to preload shared
390 objects, in addition to the LD_PRELOAD environment variable.
392 * The twalk_r function has been added. It is similar to the existing
393 twalk function, but it passes an additional caller-supplied argument
394 to the callback function.
396 * On Linux, the getdents64, gettid, and tgkill functions have been added.
398 * Minguo (Republic of China) calendar support has been added as an
399 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
402 * The entry for the new Japanese era has been added for ja_JP locale.
404 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
405 pvalloc, memalign, and posix_memalign fail now with total object size
406 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
407 pointer subtraction within the allocated object, where results might
408 overflow the ptrdiff_t type.
410 * The dynamic linker no longer refuses to load objects which reference
411 versioned symbols whose implementation has moved to a different soname
412 since the object has been linked. The old error message, symbol
413 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
414 link time reference, is gone.
416 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
417 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
418 functions. These behave similarly to their "timed" equivalents, but also
419 accept a clockid_t parameter to determine which clock their timeout should
420 be measured against. All functions allow waiting against CLOCK_MONOTONIC
421 and CLOCK_REALTIME. The decision of which clock to be used is made at the
422 time of the wait (unlike with pthread_condattr_setclock, which requires
423 the clock choice at initialization time).
425 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
426 work, new resolvers can use a second argument which can be extended in
427 the future, currently it contains the AT_HWCAP2 value.
429 Deprecated and removed features, and other changes affecting compatibility:
431 * The copy_file_range function fails with ENOSYS if the kernel does not
432 support the system call of the same name. Previously, user space
433 emulation was performed, but its behavior did not match the kernel
434 behavior, which was deemed too confusing. Applications which use the
435 copy_file_range function can no longer rely on glibc to provide a fallback
436 on kernels that do not support the copy_file_range system call, and if
437 this function returns ENOSYS, they will need to use their own fallback.
438 Support for copy_file_range for most architectures was added in version
439 4.5 of the mainline Linux kernel.
441 * The functions clock_gettime, clock_getres, clock_settime,
442 clock_getcpuclockid, clock_nanosleep were removed from the librt library
443 for new applications (on architectures which had them). Instead, the
444 definitions in libc will be used automatically, which have been available
447 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
448 and <sys/stropts.h> have been removed.
450 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
451 resolver flag (deprecated in glibc 2.25) have been removed.
453 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
454 resolver have been removed from <resolv.h>.
456 * With --enable-bind-now, installed programs are now linked with the
459 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
460 configurations) has been removed, following the deprecation of this
461 subarchitecture in version 8 of GCC, and its removal in version 9.
463 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
464 header have been removed.
466 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
467 deprecated and will be removed from a future version of glibc.
468 Application should directly access /proc instead. For obtaining random
469 bits, the getentropy function can be used.
471 Changes to build and runtime requirements:
473 * GCC 6.2 or later is required to build the GNU C Library.
475 Older GCC versions and non-GNU compilers are still supported when
476 compiling programs that use the GNU C Library.
478 Security related changes:
480 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
481 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
482 has undefined behavior. On x32, the size_t argument may be passed
483 in the lower 32 bits of the 64-bit RDX register with non-zero upper
484 32 bits. When it happened with the sign bit of RDX register set,
485 memcmp gave the wrong result since it treated the size argument as
486 zero. Reported by H.J. Lu.
488 CVE-2019-9169: Attempted case-insensitive regular-expression match
489 via proceed_next_node in posix/regexec.c leads to heap-based buffer
490 over-read. Reported by Hongxu Chen.
492 The following bugs are resolved with this release:
494 [2872] locale: Transliteration Cyrillic -> ASCII fails
495 [6399] libc: gettid() should have a wrapper
496 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
497 [16976] glob: fnmatch unbounded stack VLA for collating symbols
498 [17396] localedata: globbing for locale by [[.collating-element.]]
499 [18035] dynamic-link: pldd does no longer work, enters infinite loop
500 [18465] malloc: memusagestat is built using system C library
501 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
502 invalid input drops valid char
503 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
504 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
505 [21897] localedata: Afar locales: Fix mon, abmon, and abday
506 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
507 [23352] malloc: __malloc_check_init still defined in public header
509 [23403] nptl: Wrong alignment of TLS variables
510 [23501] libc: nftw() doesn't return dangling symlink's inode
511 [23733] malloc: Check the count before calling tcache_get()
512 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
514 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
515 [23844] nptl: pthread_rwlock_trywrlock results in hang
516 [23983] argparse: Missing compat versions of argp_failure and argp_error
517 for long double = double
518 [23984] libc: Missing compat versions of err.h and error.h functions for
520 [23996] localedata: Dutch salutations
521 [24040] libc: riscv64: unterminated call chain in __thread_start
522 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
524 [24051] stdio: puts and putchar ouput to _IO_stdout instead of stdout
525 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
527 [24114] regex: regexec buffer read overrun in "grep -i
528 '\(\(\)*.\)*\(\)\(\)\1'"
529 [24122] libc: Segfaults if 0 returned from la_version
530 [24153] stdio: Some input functions do not react to stdin assignment
531 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
532 RDX is set) (CVE-2019-7309)
533 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
534 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
535 not the default "nor"
536 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
537 false positives, change to modern flexible array
538 [24180] nptl: pthread_mutex_trylock does not use the correct order of
539 instructions while maintaining the robust mutex list due to missing
541 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
542 unnecessary librt dependencies
543 [24200] localedata: Revert first_weekday removal in en_IE locale
544 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
545 [24215] nptl: pthread_timedjoin_np should be a cancellation point
546 [24216] malloc: Check for large bin list corruption when inserting
548 [24228] stdio: old x86 applications that use legacy libio crash on exit
549 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
551 [24293] localedata: Missing Minguo calendar support for TW locales
552 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
554 [24307] localedata: Update locale data to Unicode 12.0.0
555 [24323] dynamic-link: dlopen should not be able open PIE objects
556 [24335] build: "Obsolete types detected" with Linux 5.0 headers
557 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
559 [24370] localedata: Add lang_name for tt_RU locale
560 [24372] locale: Binary locale files are not architecture independent
561 [24394] time: strptime %Ey mis-parses final year of era
562 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
564 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
566 [24531] malloc: Malloc tunables give tcache assertion failures
567 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
569 [24535] localedata: Update locale data to Unicode 12.1.0
570 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
571 kernels and break testing
572 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
573 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
574 [-Werror=format-overflow=]
575 [24570] libc: alpha: compat msgctl uses __IPC_64
576 [24584] locale: Data race in __wcsmbs_clone_conv
577 [24588] stdio: Remove codecvt vtables from libio
578 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
580 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
581 [24632] stdio: Old binaries which use freopen with default stdio handles
583 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
585 [24652] localedata: szl_PL spelling correction
586 [24695] nss: nss_db: calling getpwent after endpwent crashes
587 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
588 in /etc/nsswitch.conf
589 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
590 [24740] libc: getdents64 type confusion
591 [24741] dynamic-link: ld.so should not require that a versioned symbol is
592 always implemented in the same library
593 [24744] libc: Remove copy_file_range emulation
594 [24757] malloc: memusagestat is linked against system libpthread
595 [24794] libc: Partial test suite run builds corrupt test-in-container
603 * The getcpu wrapper function has been added, which returns the currently
604 used CPU and NUMA node. This function is Linux-specific.
606 * A new convenience target has been added for distribution maintainers
607 to build and install all locales as directories with files. The new
608 target is run by issuing the following command in your build tree:
609 'make localedata/install-locale-files', with an optional DESTDIR
610 to set the install root if you wish to install into a non-default
613 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
615 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
616 for _GNU_SOURCE, to match BSD environments.
618 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
619 indicates that it will abort the transaction prior to entering the kernel
620 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
621 suspended, and this caused some undefined side-effects issues by aborting
622 transactions manually. Glibc avoided it by abort transactions manually on
623 each syscall, but it lead to performance issues on newer kernels where the
624 HTM state is saved and restore lazily (the state being saved even when the
625 process actually does not use HTM).
627 * The functions posix_spawn_file_actions_addchdir_np and
628 posix_spawn_file_actions_addfchdir_np have been added, enabling
629 posix_spawn and posix_spawnp to run the new process in a different
630 directory. These functions are GNU extensions. The function
631 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
634 * The popen and system do not run atfork handlers anymore (BZ#17490).
635 Although it is a possible POSIX violation, the POSIX rationale in
636 pthread_atfork documentation regarding atfork handlers is to handle
637 inconsistent mutex state after a fork call in a multi-threaded process.
638 In both popen and system there is no direct access to user-defined mutexes.
640 * Support for the C-SKY ABIV2 running on Linux has been added. This port
641 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
643 - C-SKY ABIV2 soft-float little-endian
644 - C-SKY ABIV2 hard-float little-endian
646 * strftime's default formatting of a locale's alternative year (%Ey)
647 has been changed to zero-pad the year to a minimum of two digits,
648 like "%y". This improves the display of Japanese era years during
649 the first nine years of a new era, and is expected to be harmless
650 for all other locales (only Japanese locales regularly have
651 alternative year numbers less than 10). Zero-padding can be
652 overridden with the '_' or '-' flags (which are GNU extensions).
654 * As a GNU extension, the '_' and '-' flags can now be applied to
655 "%EY" to control how the year number is formatted; they have the
656 same effect that they would on "%Ey".
658 Deprecated and removed features, and other changes affecting compatibility:
660 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
661 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
663 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
664 in <sys/procfs.h>, has been corrected to match the type actually used by
665 the Linux kernel. This affects the size and layout of that structure on
666 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
668 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
669 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
670 defined in <sys/procfs.h>, has been corrected to match the type actually
671 used by the Linux kernel. This affects the size and layout of those
674 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
675 meant to scan a string and allocate space for it with malloc, is now
676 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
677 defined. This extension conflicts with C99's use of '%a' to scan a
678 hexadecimal floating-point number, which is now available to programs
679 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
681 POSIX.1-2008 includes the feature of allocating a buffer for string input
682 with malloc, using the modifier letter 'm' instead. Programs using
683 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
684 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
685 C99 '%a' no longer need to avoid _GNU_SOURCE.
687 GCC's -Wformat warnings can detect most uses of this extension, as long
688 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
689 __attribute__ ((format (scanf, ...))).
691 Changes to build and runtime requirements:
693 * Python 3.4 or later is required to build the GNU C Library.
695 * On most architectures, GCC 5 or later is required to build the GNU C
696 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
698 Older GCC versions and non-GNU compilers are still supported when
699 compiling programs that use the GNU C Library.
701 Security related changes:
703 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
704 denial of service due to resource exhaustion when processing getaddrinfo
705 calls with crafted host names. Reported by Guido Vranken.
707 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
708 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
709 happened, accessing the 32-bit size_t value as the full 64-bit register
710 in the assembly string/memory functions would cause a buffer overflow.
713 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
714 addresses with arbitrary trailing characters, potentially leading to data
715 or command injection issues in applications.
717 The following bugs are resolved with this release:
719 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
720 [10496] localedata: 12h time representation in multiple locales faulty
721 [10797] localedata: it_IT locale numeric does not have a separator for
723 [11319] libc: dprintf doesn't handle errors properly
724 [16346] time: mktime: potentially unsafe use of localtime_offset
725 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
727 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
728 posix_spawn_file_actions_addfchdir_np
729 [17426] localedata: Indian locales: set the correct date format
730 [17490] stdio: popen should not invoke atfork handlers
731 [17783] libc: TIOCSER_TEMT conditions inconsistent
732 [18040] regex: use-after-free in regexec/get_subexp
733 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
734 [20018] network: getaddrinfo should reject IP addresses with trailing
735 characters (CVE-2016-10739)
736 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
737 [20271] libc: Missing "\n" in __libc_fatal calls
738 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
739 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
740 pointer argument is non-NULL
741 [21037] stdio: open_memstream and freopen
742 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
743 [21716] time: Crash in glibc's mktime in low-memory situations
744 [22834] stdio: Subprocess forked by popen may crash in Linux when
745 multithreads call popen
746 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
747 and pthread_create fails.
748 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
749 [23125] libc: riscv64: endless loop when throwing an exception from a
751 [23275] nptl: Race in pthread_mutex_lock while promoting to
752 PTHREAD_MUTEX_ELISION_NP.
753 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
755 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
757 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
759 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
760 [23509] dynamic-link: CET enabled glibc is incompatible with the older
762 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
763 [23521] nss: get_next_alias nss_files file stream leak
764 [23538] nptl: Hang in pthread_cond_broadcast
765 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
766 [23578] regex: Invalid memory access if regex pattern contains NUL byte
767 [23579] libc: Errors misreported in preadv2
768 [23597] build: support/test-container.c doesn't work with different
770 [23603] time: mktime signed integer overflow on large timestamps
771 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
772 [23614] libc: powerpc: missing CFI register information in __mpn_*
774 [23637] string: Generic strstr/strcasestr fails with huge needles
775 [23640] libc: no way to easily clear FD_CLOEXEC in
776 posix_spawn_file_actions_adddup2()
777 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
779 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
781 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
782 [23689] libc: Bug in documentation for rusage.ru_ixrss in
783 bits/types/struct_rusage.h
784 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
786 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
788 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
789 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
790 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
792 [23724] localedata: Albanian date formats are incorrect
793 [23735] math: libnldbl_nonshared.a references internal libm symbols
794 [23740] localedata: kl_GL: Month names and date formats need update
795 [23744] regex: regex refactorings to remove BE, avoid duplication
796 [23745] time: mktime fix for Gnulib + coreutils
797 [23758] time: Improve the width of alternate representation for year in
799 [23783] libc: [mips] Missing CMSPAR bits/termios.h
800 [23789] time: mktime does not set errno on failure
801 [23791] localedata: Wrong monetary format for ca_ES locale
802 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
803 [23794] locale: c16rtomb does not handle surrogate pairs
804 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
805 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
806 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
807 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
808 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
809 [23862] libc: [sh] missing kernel-features.h undefines
810 [23864] libc: [riscv] missing kernel-features.h undefines
811 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
812 [23907] malloc: Incorrect double-free malloc tcache check disregards
814 [23913] libc: off-by-one in function maybe_script_execute in
815 sysdeps/posix/spawni.c
816 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
817 [23923] locale: Add --no-hard-links option to localedef
818 [23927] network: Linux if_nametoindex() does not close descriptor
820 [23961] math: powf can overflow to inf without setting errno in non-
821 nearest rounding mode
822 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
823 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
824 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
825 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
826 [24011] localedata: Fixed small type in comment for locale bs_BA
827 [24018] libc: gettext() may return NULL
828 [24022] build: riscv build failure with Linux kernel 4.20-rc7
829 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
830 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
832 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
833 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
835 [24046] localedata: en_US locale doesn't define date_fmt
836 [24063] manual: @var{errno} should be @code{errno}
837 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
838 [24088] libc: VSCR field is not being correctly read in ucontext_t on
840 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
842 [24097] string: Can't use 64-bit register for size_t in assembly codes for
844 [24110] hurd: SS_DISABLE never set in stack_t value returned by
846 [24112] network: Do not send DNS queries for non-host names (where all
847 answers will be rejected)
848 [24130] libc: alpha __remqu corrupts $f3 register
855 * The localization data for ISO 14651 is updated to match the 2016
856 Edition 4 release of the standard, this matches data provided by
857 Unicode 9.0.0. This update introduces significant improvements to the
858 collation of Unicode characters. This release deviates slightly from
859 the standard in that the collation element ordering for lowercase and
860 uppercase LATIN script characters is adjusted to ensure that regular
861 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
862 is not matched by [a-z]. With the update many locales have been
863 updated to take advantage of the new collation information. The new
864 collation information has increased the size of the compiled locale
865 archive or binary locales.
867 * The GNU C Library can now be compiled with support for Intel CET, AKA
868 Intel Control-flow Enforcement Technology. When the library is built
869 with --enable-cet, the resulting glibc is protected with indirect
870 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
871 compatible with all existing executables and shared libraries. This
872 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
873 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
874 capable of multi-byte NOPs, like x86-64 processors as well as Intel
875 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
876 x86_64 and x32 on non-CET processors. --enable-cet has been tested
877 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
880 * The GNU C Library now has correct support for ABSOLUTE symbols
881 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
882 relocated incorrectly or in some cases discarded. The GNU linker can
883 make use of the newer semantics, but it must communicate it to the
884 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
885 field) to indicate such support is required.
887 * Unicode 11.0.0 Support: Character encoding, character type info, and
888 transliteration tables are all updated to Unicode 11.0.0, using
889 generator scripts contributed by Mike FABIAN (Red Hat).
891 * <math.h> functions that round their results to a narrower type are added
892 from TS 18661-1:2014 and TS 18661-3:2015:
894 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
897 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
900 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
903 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
906 * Two grammatical forms of month names are now supported for the following
907 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
908 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
909 support two grammatical forms in abbreviated month names: Catalan, Greek,
912 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
913 include the support for two grammatical forms of month names.
915 * Building and running on GNU/Hurd systems now works without out-of-tree
918 * The renameat2 function has been added, a variant of the renameat function
919 which has a flags argument. If the flags are zero, the renameat2 function
920 acts like renameat. If the flag is not zero and there is no kernel
921 support for renameat2, the function will fail with an errno value of
922 EINVAL. This is different from the existing gnulib function renameatu,
923 which performs a plain rename operation in case of a RENAME_NOREPLACE
924 flags and a non-existing destination (and therefore has a race condition
925 that can clobber the destination inadvertently).
927 * The statx function has been added, a variant of the fstatat64
928 function with an additional flags argument. If there is no direct
929 kernel support for statx, glibc provides basic stat support based on
930 the fstatat64 function.
932 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
933 library if installed. libidn2 version 2.0.5 or later is recommended. If
934 libidn2 is not available, internationalized domain names are not encoded
935 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
936 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
937 with an encoding error.) Flags which used to change the IDN encoding and
938 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
939 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
940 deprecated. They no longer have any effect.
942 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
943 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
944 range of ELF gABI expressions including such constructs as
945 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
946 have been further restricted, and where in the past a dynamic string
947 token sequence may have been interpreted as a literal string it will
948 now cause a load failure. These load failures were always considered
949 unspecified behaviour from the perspective of the dynamic loader, and
950 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
951 results in a load failure now.
953 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
954 implementation includes all the standard functions provided by
957 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
958 thrd_detach, thrd_exit, and thrd_join for thread management.
960 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
961 mtx_destroy for mutual exclusion.
963 - call_once for function call synchronization.
965 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
966 cnd_wait for conditional variables.
968 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
970 Application developers must link against libpthread to use ISO C threads.
972 Deprecated and removed features, and other changes affecting compatibility:
974 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
975 installed. Software that was using either header should be updated to
976 use standard <stdio.h> interfaces instead.
978 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
979 This was never required by the C standard, and the macros just expanded
980 to call alternative names for the same functions. If you hoped getc and
981 putc would provide performance improvements over fgetc and fputc, instead
982 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
983 necessary, flockfile and funlockfile.
985 * All stdio functions now treat end-of-file as a sticky condition. If you
986 read from a file until EOF, and then the file is enlarged by another
987 process, you must call clearerr or another function with the same effect
988 (e.g. fseek, rewind) before you can read the additional data. This
989 corrects a longstanding C99 conformance bug. It is most likely to affect
990 programs that use stdio to read interactive input from a terminal.
993 * The macros 'major', 'minor', and 'makedev' are now only available from
994 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
995 headers that happen to include <sys/types.h>. These macros are rarely
996 used, not part of POSIX nor XSI, and their names frequently collide with
997 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1000 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1001 these macros should first include <sys/types.h>, and then include
1002 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1004 * The tilegx*-*-linux-gnu configurations are no longer supported.
1006 * The obsolete function ustat is no longer available to newly linked
1007 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1008 function has been deprecated in favor of fstatfs and statfs.
1010 * The obsolete function nfsservctl is no longer available to newly linked
1011 binaries. This function was specific to systems using the Linux kernel
1012 and could not usefully be used with the GNU C Library on systems with
1013 version 3.1 or later of the Linux kernel.
1015 * The obsolete function name llseek is no longer available to newly linked
1016 binaries. This function was specific to systems using the Linux kernel
1017 and was not declared in a header. Programs should use the lseek64 name
1018 for this function instead.
1020 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1021 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1022 previously selected by them is now always enabled.
1024 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1025 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1026 restriction (rejecting '_' in host names, among other things) has been
1027 removed, for increased compatibility with non-IDN name resolution.
1029 * The fcntl function now have a Long File Support variant named fcntl64. It
1030 is added to fix some Linux Open File Description (OFD) locks usage on non
1031 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1032 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1033 locks act as a cancellation entrypoint.
1035 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1036 ecb_crypt, and des_setparity are no longer available to newly linked
1037 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1038 longer installed. These functions encrypted and decrypted data with the
1039 DES block cipher, which is no longer considered secure. Software that
1040 still uses these functions should switch to a modern cryptography library,
1043 * Reflecting the removal of the encrypt and setkey functions above, the
1044 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1045 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1048 * The obsolete function fcrypt is no longer available to newly linked
1049 binaries. It was just another name for the standard function crypt,
1050 and it has not appeared in any header file in many years.
1052 * We have tentative plans to hand off maintenance of the passphrase-hashing
1053 library, libcrypt, to a separate development project that will, we hope,
1054 keep up better with new passphrase-hashing algorithms. We will continue
1055 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1056 'crypt_r' should not need to change at all; however, distributions will
1057 need to install <crypt.h> and libcrypt from a separate project.
1059 In this release, if the configure option --disable-crypt is used, glibc
1060 will not install <crypt.h> or libcrypt, making room for the separate
1061 project's versions of these files. The plan is to make this the default
1062 behavior in a future release.
1064 Changes to build and runtime requirements:
1066 GNU make 4.0 or later is now required to build glibc.
1068 Security related changes:
1070 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1071 been fixed by removing the glibc-internal IDNA implementation and using
1072 the system-provided libidn2 library instead. Originally reported by Hanno
1073 Böck and Christian Weisgerber.
1075 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1076 architecture could corrupt memory. Reported by Max Horn.
1078 CVE-2018-11236: Very long pathname arguments to realpath function could
1079 result in an integer overflow and buffer overflow. Reported by Alexey
1082 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1083 architecture could write beyond the target buffer, resulting in a buffer
1084 overflow. Reported by Andreas Schwab.
1086 The following bugs are resolved with this release:
1088 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1089 [6889] manual: 'PWD' mentioned but not specified
1090 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1091 when __WORDSIZE != 64
1092 [13762] regex: re_search etc. should return -2 on memory exhaustion
1093 [13888] build: /tmp usage during testing
1094 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1095 [14092] nptl: Support C11 threads
1096 [14095] localedata: Review / update collation data from Unicode / ISO
1098 [14508] libc: -Wformat warnings
1099 [14553] libc: Namespace pollution loff_t in sys/types.h
1100 [14890] libc: Make NT_PRFPREG canonical.
1101 [15105] libc: Extra PLT references with -Os
1102 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1104 [16335] manual: Feature test macro documentation incomplete and out of
1106 [16552] libc: Unify umount implementations in terms of umount2
1107 [17082] libc: htons et al.: statement-expressions prevent use on global
1108 scope with -O1 and higher
1109 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1110 [17438] localedata: pt_BR: wrong d_fmt delimiter
1111 [17662] libc: please implement binding for the new renameat2 syscall
1112 [17721] libc: __restrict defined as /* Ignore */ even in c11
1113 [17979] libc: inconsistency between uchar.h and stdint.h
1114 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1115 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1116 horrible machine code)
1117 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1119 [18471] libc: llseek should be a compat symbol
1120 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1122 [18991] nss: nss_files skips large entry in database
1123 [19239] libc: Including stdlib.h ends up with macros major and minor being
1125 [19463] libc: linknamespace failures when compiled with -Os
1126 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1127 [19527] locale: Normalized charset name not recognized by setlocale
1128 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1129 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1131 [19728] network: out of bounds stack read in libidn function
1132 idna_to_ascii_4i (CVE-2016-6261)
1133 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1134 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1135 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1137 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1138 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1139 [20419] dynamic-link: files with large allocated notes crash in
1141 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1142 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1143 [20980] manual: CFLAGS environment variable replaces vital options
1144 [21163] regex: Assertion failure in pop_fail_stack when executing a
1145 malformed regexp (CVE-2015-8985)
1146 [21234] manual: use of CFLAGS makes glibc detect no optimization
1147 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1148 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1149 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1150 [21508] locale: intl/tst-gettext failure with latest msgfmt
1151 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1152 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1153 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1155 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1157 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1158 [22247] network: Integer overflow in the decode_digit function in
1159 puny_decode.c in libidn (CVE-2017-14062)
1160 [22342] nscd: NSCD not properly caching netgroup
1161 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1162 [22550] localedata: es_ES locale (and other es_* locales): collation
1163 should treat ñ as a primary different character, sync the collation
1164 for Spanish with CLDR
1165 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1166 by gcc configured with --enable-default-pie
1167 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1168 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1169 crossing 2GB threshold (CVE-2017-18269)
1170 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1172 [22735] time: Misleading typo in time.h source comment regarding
1174 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1175 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1176 `__assert_perror_fail ()' to `__assert_fail_base ()'
1177 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1179 [22786] libc: Stack buffer overflow in realpath() if input size is close
1180 to SSIZE_MAX (CVE-2018-11236)
1181 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1182 through an absolute DT_NEEDED path
1183 [22792] build: tcb-offsets.h dependency dropped
1184 [22797] libc: pkey_get() uses non-reserved name of argument
1185 [22807] libc: PTRACE_* constants missing for powerpc
1186 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1187 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1188 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1189 [22848] localedata: ca_ES: update date definitions from CLDR
1190 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1191 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1192 [22896] localedata: Update locale data for an_ES
1193 [22902] math: float128 test failures with GCC 8
1194 [22918] libc: multiple common of `__nss_shadow_database'
1195 [22919] libc: sparc32: backtrace yields infinite backtrace with
1197 [22926] libc: FTBFS on powerpcspe
1198 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1200 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1201 [22947] libc: FAIL: misc/tst-preadvwritev2
1202 [22963] localedata: cs_CZ: Add alternative month names
1203 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1204 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1205 [22998] dynamic-link: execstack tests are disabled when SELinux is
1207 [23005] network: Crash in __res_context_send after memory allocation
1209 [23007] math: strtod cannot handle -nan
1210 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1211 [23036] regex: regex equivalence class regression
1212 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1213 [23069] libc: sigaction broken on riscv64-linux-gnu
1214 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1215 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1216 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1217 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1218 and libc build with -Os)
1219 [23140] localedata: More languages need two forms of month names
1220 [23145] libc: _init/_fini aren't marked as hidden
1221 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1222 [23171] math: C++ iseqsig for long double converts arguments to double
1223 [23178] nscd: sudo will fail when it is run in concurrent with commands
1224 that changes /etc/passwd
1225 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1227 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1228 [23208] localedata: New locale - Lower Sorbian (dsb)
1229 [23233] regex: Memory leak in build_charclass_op function in file
1231 [23236] stdio: Harden function pointers in _IO_str_fields
1232 [23250] nptl: Offset of __private_ss differs from GCC
1233 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1234 -mtune=generic -mfpmath=sse
1235 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1237 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1238 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1240 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1241 [23277] math: nan function should not have const attribute
1242 [23279] math: scanf and strtod wrong for some hex floating-point
1243 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1245 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1246 [23303] build: undefined reference to symbol
1247 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1248 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1250 [23313] stdio: libio vtables validation and standard file object
1252 [23329] libc: The __libc_freeres infrastructure is not properly run across
1254 [23349] libc: Various glibc headers no longer compatible with
1256 [23351] malloc: Remove unused code related to heap dumps and malloc
1258 [23363] stdio: stdio-common/tst-printf.c has non-free license
1259 [23396] regex: Regex equivalence regression in single-byte locales
1260 [23422] localedata: oc_FR: More updates of locale data
1261 [23442] build: New warning with GCC 8
1262 [23448] libc: Out of bounds access in IBM-1390 converter
1263 [23456] libc: Wrong index_cpu_LZCNT
1264 [23458] build: tst-get-cpu-features-static isn't added to tests
1265 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1267 [23467] dynamic-link: x86/CET: A property note parser bug
1274 * The GNU C Library can now be compiled with support for building static
1275 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1276 executables are like static executables but can be loaded at any address
1277 and provide additional security hardening benefits at the cost of some
1278 memory and performance. When the library is built with --enable-static-pie
1279 the resulting libc.a is usable with GCC 8 and above to create static PIE
1280 executables using the GCC option '-static-pie'. This feature is currently
1281 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1282 aarch64 with binutils 2.30 or later.
1284 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1285 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1288 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1290 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1292 * In order to support faster and safer process termination the malloc API
1293 family of functions will no longer print a failure address and stack
1294 backtrace after detecting heap corruption. The goal is to minimize the
1295 amount of work done after corruption is detected and to avoid potential
1296 security issues in continued process execution. Reducing shutdown time
1297 leads to lower overall process restart latency, so there is benefit both
1298 from a security and performance perspective.
1300 * The abort function terminates the process immediately, without flushing
1301 stdio streams. Previous glibc versions used to flush streams, resulting
1302 in deadlocks and further data corruption. This change also affects
1303 process aborts as the result of assertion failures.
1305 * On platforms where long double has the IEEE binary128 format (aarch64,
1306 alpha, mips64, riscv, s390 and sparc), the math library now implements
1307 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1308 These are the same interfaces added in version 2.26 for some platforms where
1309 this format is supported but is not the format of long double.
1311 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1312 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1313 implements interfaces for that type, as defined by ISO/IEC TS
1314 18661-3:2015. These are corresponding interfaces to those supported for
1317 * The math library now implements interfaces for the _Float32, _Float64 and
1318 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1319 corresponding interfaces to those supported for _Float128.
1321 * glibc now implements the memfd_create and mlock2 functions on Linux.
1323 * Support for memory protection keys was added. The <sys/mman.h> header now
1324 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1327 * The copy_file_range function was added.
1329 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1331 * The ldconfig utility now processes `include' directives using the C/POSIX
1332 collation ordering. Previous glibc versions used locale-specific
1333 ordering, the change might break systems that relied on that.
1335 * Support for two grammatical forms of month names has been added.
1336 In a call to strftime, the "%B" and "%b" format specifiers will now
1337 produce the grammatical form required when the month is used as part
1338 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1339 required when the month is named by itself. For instance, in Greek
1340 and in many Slavic and Baltic languages, "%B" will produce the month
1341 in genitive case, and "%OB" will produce the month in nominative case.
1343 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1344 are all valid and will all accept any known form of month
1345 name---standalone or complete, abbreviated or full. In a call to
1346 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1347 the strings used by "%B" and "%b", respectively. New query
1348 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1349 used by "%OB" and "%Ob", respectively.
1351 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1352 define the strings for %OB and %Ob, respectively; these have the
1353 same syntax as "mon" and "abmon". These arrays are optional; if they
1354 are not provided then they have the same content as "mon" and "abmon",
1357 These features are provided for locales which define "alt_mon" and/or
1358 "ab_alt_mon" in their locale source data. This release includes such
1359 alternative month name data for the following languages: Belarusian,
1360 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1362 This feature is currently a GNU extension, but it is expected to
1363 be added to the next revision of POSIX, and it is also already
1364 available on some BSD-derived operating systems.
1366 This feature will cause existing statically compiled applications
1367 to fail to load locales and fall back to the builtin C/POSIX locales.
1368 See notes below for other changes affecting compatibility.
1370 * Support for the RISC-V ISA running on Linux has been added. This port
1371 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1372 for the following ISA and ABI pairs:
1378 Deprecated and removed features, and other changes affecting compatibility:
1380 * Statically compiled applications attempting to load locales compiled for the
1381 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1382 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1383 support for two grammatical forms of the month names, also extends the locale
1384 data binary format. Static applications needing locale support must be
1385 recompiled to match the runtime and data they are deployed with. In some
1386 distributions there is an upgrade window where dynamically linked applications
1387 may use a new library but the old locale data and also fall back to the
1388 builtin C/POSIX locales; restarting the application process is sufficient to
1391 * Support for statically linked applications which call dlopen is deprecated
1392 and will be removed in a future version of glibc. Applications which call
1393 dlopen need to be linked dynamically instead.
1395 * Support for old programs which use internal stdio data structures and
1396 functions is deprecated. This includes programs which use the C++ streams
1397 provided by libstdc++ in GCC 2.95. Programs which use the internal
1398 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1399 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1400 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1401 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1402 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1403 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1404 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1405 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1406 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1407 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1408 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1409 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1410 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1411 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1412 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1413 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1414 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1415 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1416 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1417 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1418 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1419 future version of glibc. Unlike other symbol removals, these old
1420 applications will not be supported using compatibility symbols.
1422 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1423 defined by <sys/ptrace.h>.
1425 * libm no longer supports SVID error handling (calling a user-provided
1426 matherr function on error) or the _LIB_VERSION variable to control error
1427 handling. (SVID error handling and the _LIB_VERSION variable still work
1428 for binaries linked against older versions of the GNU C Library.) The
1429 libieee.a library is no longer provided. math.h no longer defines struct
1430 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1431 TLOSS, PLOSS and HUGE.
1433 * The libm functions pow10, pow10f and pow10l are no longer supported for
1434 new programs. Programs should use the standard names exp10, exp10f and
1435 exp10l for these functions instead.
1437 * The mcontext_t type is no longer the same as struct sigcontext. On
1438 platforms where it was previously the same, this changes the C++ name
1439 mangling for interfaces involving this type.
1441 * The add-ons mechanism for building additional packages at the same time as
1442 glibc has been removed. The --enable-add-ons configure option is now
1445 * The --without-fp configure option is now ignored. Whether hardware
1446 floating-point instructions are used is now configured based on whether
1447 the compiler used at configure time (without any options implied by a
1448 --with-cpu= configure option) uses such instructions.
1450 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1451 the specified string can be parsed as a domain name.
1453 * In the malloc_info output, the <heap> element may contain another <aspace>
1454 element, "subheaps", which contains the number of sub-heaps.
1456 * The libresolv function p_secstodate is no longer supported for new
1459 * The tilepro-*-linux-gnu configuration is no longer supported.
1461 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1462 and will be removed in a future release. Software that is still using
1463 either header should be updated to use standard <stdio.h> interfaces
1466 libio.h was originally the header for a set of supported GNU extensions,
1467 but they have not been maintained as such in many years, they are now
1468 standing in the way of improvements to stdio, and we don't think there are
1469 any remaining external users. _G_config.h was never intended for public
1470 use, but predates the bits convention.
1472 Changes to build and runtime requirements:
1474 * bison version 2.7 or later is required to generate code in the 'intl'
1477 Security related changes:
1479 CVE-2009-5064: The ldd script would sometimes run the program under
1480 examination directly, without preventing code execution through the
1481 dynamic linker. (The glibc project disputes that this is a security
1482 vulnerability; only trusted binaries must be examined using the ldd
1485 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1486 suffered from a one-byte overflow during ~ operator processing (either
1487 on the stack or the heap, depending on the length of the user name).
1488 Reported by Tim Rühsen.
1490 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1491 would sometimes fail to free memory allocated during ~ operator
1492 processing, leading to a memory leak and, potentially, to a denial
1495 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1496 without GLOB_NOESCAPE, could write past the end of a buffer while
1497 unescaping user names. Reported by Tim Rühsen.
1499 CVE-2017-17426: The malloc function, when called with an object size near
1500 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1501 instead of NULL. This was a regression introduced with the new malloc
1502 thread cache in glibc 2.26. Reported by Iain Buclaw.
1504 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1505 to the allocation of too much memory. (This is not a security bug per se,
1506 it is mentioned here only because of the CVE assignment.) Reported by
1509 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1510 of the number of search path components. (This is not a security
1511 vulnerability per se because no trust boundary is crossed if the fix for
1512 CVE-2017-1000366 has been applied, but it is mentioned here only because
1513 of the CVE assignment.) Reported by Qualys.
1515 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1516 for AT_SECURE or SUID binaries could be used to load libraries from the
1519 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1520 succeeds without returning an absolute path due to unexpected behaviour
1521 of the Linux kernel getcwd syscall. Reported by halfdog.
1523 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1524 an object size near the value of SIZE_MAX, would return a pointer to a
1525 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1527 CVE-2018-6551: The malloc function, when called with an object size near
1528 the value of SIZE_MAX, would return a pointer to a buffer which is too
1529 small, instead of NULL.
1531 The following bugs are resolved with this release:
1533 [866] glob: glob should match dangling symlinks
1534 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1535 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1537 [5997] math: Very slow execution of sinf function
1538 [10580] localedata: hr_HR: updated locale
1539 [10871] locale: 'mon' array should contain both nominative and genitive
1541 [12349] localedata: eu_ES: incorrect thousands separator
1542 [13605] localedata: shn_MM: new Shan locale
1543 [13805] localedata: ru_RU: currency should use ',' as radix point
1544 [13953] localedata: km_KH: locale update
1545 [13994] localedata: mjw_IN: new locale
1546 [14121] build: make writes .mo files in po directory
1547 [14333] libc: Fix the race between atexit() and exit()
1548 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1549 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1551 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1552 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1553 width Latin characters
1554 [15332] localedata: es_CU: locale update
1555 [15436] stdio: Don't close or flush stdio streams on abort
1556 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1558 [16148] localedata: ca_ES: incorrect thousands separator
1559 [16750] dynamic-link: ldd should not try to execute the binaries
1561 [16777] localedata: pl_PL: incorrect thousands separator in locale
1562 [16905] localedata: hanzi: new collation
1563 [17563] localedata: cmn_TW: add hanzi collation
1564 [17750] localedata: wrong collation order of diacritics in most locales
1565 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1567 [17956] build: Build fails on missing definitions from header file
1568 nss/nss.h when Mozilla NSS is used for cryptography
1569 [18203] libc: realpath() does not handle unreachable paths correctly
1570 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1571 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1572 [18822] libc: Internal functions are called via PLT
1573 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1574 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1575 [19574] libc: glibc should support building static PIE binaries
1576 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1578 [19971] glob: glob: Do not skip entries with zero d_ino values
1579 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1580 [20008] localedata: km_KH: convert to translit_neutral
1581 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1582 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1583 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1584 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1585 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
1587 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1588 they're set, wrong errors returned by gaih_inet when lookup functions
1590 [20756] localedata: [PATCH] Use Unicode wise thousands separator
1591 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1593 [20952] localedata: yuw_PG: new locale
1594 [21084] localedata: charmaps/IBM858: new codepage
1595 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1596 [21242] libc: assert gives pedantic warning in old gcc versions
1597 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1598 __regcall calling convention
1599 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1600 [21326] libc: C99 functions are not declared for C++11 and later if
1601 _GNU_SOURCE is not predefined by g++
1602 [21457] libc: sys/ucontext.h namespace
1603 [21530] libc: tmpfile() should be implemented using O_TMPFILE
1604 [21660] math: GCC fails to compile a formula with tgmath.h
1605 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1606 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1607 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1608 [21684] math: tgmath.h handling of complex integers
1609 [21685] math: tgmath.h handling of bit-fields
1610 [21686] math: tgmath.h handling of __int128
1611 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1613 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1615 [21750] localedata: column width of characters incompatible with classical
1617 [21754] malloc: malloc: Perform as little work as possible after heap
1618 consistency check failures
1619 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1620 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1621 [21791] string: Unused XXX_chk_XXX functions in libc.a
1622 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1624 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1626 [21845] localedata: Added new Locale bho_NP
1627 [21853] localedata: Fix abday Which looks same as day in zh_SG
1628 [21854] localedata: Added New Locale en_SC
1629 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1630 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1631 _dl_runtime_resolve_avx_slow
1632 [21885] network: getaddrinfo: gethosts does not release resolver context
1633 on memory allocation failure
1634 [21899] libc: XPG4.2 sigaction namespace
1635 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1637 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1639 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1640 errno value, causing getaddrinfo to fail
1641 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1642 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1643 instead of EAI_NODATA
1644 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1645 constant PTRACE_SEIZE_DEVEL
1646 [21930] math: C-only gcc builtins used in <math.h> isinf
1647 [21932] network: Unpaired __resolv_context_get in generic get*_r
1649 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1650 [21944] libc: sigval namespace
1651 [21951] localedata: Update hanzi collation by stroke
1652 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
1653 sysdeps/x86_64/fpu/e_expf.S
1654 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1655 allocation in syscall loops)
1656 [21959] localedata: Fix Country name for xh_ZA
1657 [21960] localedata: Fix abmon for bem_ZM
1658 [21966] math: AVX2 mathvec functions use FMA without checking
1659 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1660 [21971] localedata: Added New Locale for mfe_MU
1661 [21972] libc: assert macro requires operator== (int) for its argument type
1662 [21973] math: [sparc] libm missing sqrtl compat symbol
1663 [21974] libc: Remove __bb_init_func and __bb_exit_func
1664 [21982] string: stratcliff.c: error: assuming signed overflow does not
1666 [21986] stdio: __guess_grouping is called incorrectly
1667 [21987] math: [sparc32] wrong bits/long-double.h installed
1668 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1670 [22022] localedata: Missing country_name for mni_IN
1671 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1673 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1675 [22026] locale: iconv_open: heap overflow on gconv_init failure
1676 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1677 [22035] math: [m68k] bits/math-inline.h macro namespace
1678 [22038] localedata: Fix abbreviated weeks and months for Somali
1679 [22044] localedata: Remove redundant data for Limburgish Language
1680 [22050] malloc: Linking with -lmcheck does not hook
1681 __malloc_initialize_hook correctly
1682 [22051] libc: zero terminator in the middle of glibc's .eh_frame
1683 [22052] malloc: malloc failed to compile with GCC 7 and -O3
1684 [22070] localedata: charmaps/UTF-8: wcwidth for
1685 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1686 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1687 Jungseong and Jongseong) should be 0
1688 [22078] nss: nss_files performance issue in multi mode
1689 [22082] math: bits/math-finite.h exp10 condition
1690 [22086] libc: pcprofiledump incorrect cross-endian condition
1691 [22093] dynamic-link: ld.so no longer searches in .../x86_64
1692 [22095] network: Name server address allocation memory leak in resolv.conf
1694 [22096] network: __resolv_conf_attach can incorrectly free passed conf
1696 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1697 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1699 [22111] malloc: malloc: per thread cache is not returned when thread exits
1700 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1701 [22134] libc: [linux] implement fexecve with execveat
1702 [22142] libc: [powerpc] printf oupts a wrong value of DBL_MAX on ppc64 and
1704 [22145] libc: ttyname() gives up too early in the face of namespaces
1705 [22146] math: C++ build issue with float128 on x86_64
1706 [22153] nptl: nptl: save error code before process termination
1707 [22156] libc: [hppa,ia64,microblaze] Executable stack default
1708 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1709 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1710 [22165] libc: [hppa] Text relocations in libc.so
1711 [22180] libc: destructor registered via __cxa_atexit is called twice
1712 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1713 symlinks") cause "make" segfaults
1714 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1716 [22207] libc: FAIL: stdlib/test-atexit-race
1717 [22225] math: nearbyint arithmetic moved before feholdexcept
1718 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1719 [22235] math: iscanonical in C++ and float128
1720 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1721 the svid compat wrapper
1722 [22244] math: ynf and yn are wrong without the svid compat wrapper
1723 [22273] libc: Improper assert in Linux posix_spawn implementation
1724 [22284] libc: -pg -pie doesn't work
1725 [22292] locale: localedef exits with error 4 when it should be error 1
1726 [22294] locale: Allow "" for int_currency_symbol definition in locales.
1727 [22295] locale: Don't warn on non-symbolic characters in locale sources in
1729 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1730 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1732 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1733 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1734 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1735 [22322] libc: [mips64] wrong bits/long-double.h installed
1736 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1737 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1739 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1740 [22343] malloc: Integer overflow in posix_memalign
1741 [22347] libc: getrandom() returns the number of bytes that were copied to
1742 the buffer even though the comments say "Return 0 on success and -1 on
1744 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1745 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1747 [22370] dynamic-link: Incorrect note padding check
1748 [22375] libc: malloc returns pointer from tcache_get when should return
1749 NULL (CVE-2017-17426)
1750 [22377] math: iseqsig, float128 and C++
1751 [22382] localedata: Error in tpi_PG locale
1752 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1753 inside the ASCII printable range
1754 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1756 [22403] localedata: Slash needs escaping in some locales
1757 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1758 [22409] network: res_hnok does not accept some host names used on the
1760 [22412] network: res_dnok, res_hnok should perform syntax checks
1761 [22413] network: ns_name_pton ignores syntactically invalid trailing
1763 [22415] stdio: setvbuf can lead to invalid free/segfault
1764 [22432] build: Non-deterministic build
1765 [22439] malloc: malloc_info should compute summary statistics for all sub-
1767 [22442] network: if_nametoindex could report index for the wrong
1768 networking interface
1769 [22446] build: aliasing violation calling readlink in handle_request
1770 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
1771 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
1772 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
1773 __nscd_hash/__nss_hash
1774 [22463] network: p_secstodate overflow handling
1775 [22469] localedata: pl_PL LC_COLLATE does not use i18n
1776 [22478] libc: sigwait can fail with EINTR
1777 [22505] libc: ldconfig processes include directive in locale-specific
1779 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
1780 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
1781 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
1782 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
1783 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
1784 [22534] localedata: Collation rules for Serbian and Bosnian should be the
1785 same as for Croatian
1786 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
1787 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
1788 [22577] libc: missing newline after "cannot allocate TLS data structures
1790 [22588] manual: manual/conf.texi: missing underscore in front of
1792 [22593] math: nextafter and nexttoward are declared with const attribute
1793 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
1794 [22603] string: ia64 memchr overflows internal pointer check
1795 [22605] libc: SH clone does not set the exit code correctly
1796 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
1798 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
1799 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
1800 modified in case of success
1801 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
1802 [22615] manual: manual: ambiguous wording about errno value in case of
1804 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
1806 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
1807 binaries or if /proc is not mounted (CVE-2017-16997)
1808 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
1809 [22630] build: $(no-pie-ldflag) is no longer effective
1810 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
1811 [22635] nptl: pthread_self returns NULL before libpthread is loaded
1812 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
1813 [22637] nptl: guard size is subtracted from thread stack size instead of
1815 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
1816 [22657] localedata: hu_HU: Avoid double space in date
1817 [22660] math: fmax, fmin sNaN handling on alpha
1818 [22664] libc: New warning of GCC8
1819 [22665] math: alpha: ceil and floor raise inexact exceptions
1820 [22666] math: alpha: trunc raise inexact exceptions
1821 [22667] libc: makecontext lacks stack alignment on i386
1822 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
1823 [22679] libc: getcwd(3) can succeed without returning an absolute path
1825 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
1826 elision and tunables
1827 [22687] math: [powerpc-nofpu] complex long double functions spurious
1829 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
1830 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
1831 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
1833 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
1834 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
1836 [22701] nis: Incomplete removal of libnsl
1837 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
1838 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
1839 [22715] dynamic-link: FAIL: elf/tst-audit10
1840 [22719] libc: Backtrace tests fail on hppa
1841 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
1842 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
1843 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
1844 before the first call to crypt_r () in crypt/badsalttest.c
1851 * A per-thread cache has been added to malloc. Access to the cache requires
1852 no locks and therefore significantly accelerates the fast path to allocate
1853 and free small amounts of memory. Refilling an empty cache requires locking
1854 the underlying arena. Performance measurements show significant gains in a
1855 wide variety of user workloads. Workloads were captured using a special
1856 instrumented malloc and analyzed with a malloc simulator. Contributed by
1857 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
1859 * Unicode 10.0.0 Support: Character encoding, character type info, and
1860 transliteration tables are all updated to Unicode 10.0.0, using
1861 generator scripts contributed by Mike FABIAN (Red Hat).
1862 These updates cause user visible changes, especially the changes in
1863 wcwidth for many emoji characters cause problems when emoji sequences
1864 are rendered with pango, see for example:
1865 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
1867 * Collation of Hungarian has been overhauled and is now consistent with "The
1868 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
1871 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
1873 - The GNU C Library will now detect when /etc/resolv.conf has been
1874 modified and reload the changed configuration. The new resolver option
1875 “no-reload” (RES_NORELOAD) disables this behavior.
1877 - The GNU C Library now supports an arbitrary number of search domains
1878 (configured using the “search” directive in /etc/resolv.conf);
1879 previously, there was a hard limit of six domains. For backward
1880 compatibility, applications that directly modify the ‘_res’ global
1881 object are still limited to six search domains.
1883 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
1884 Library will now randomly pick a name server from the configuration as a
1885 starting point. (Previously, the second name server was always used.)
1887 * The tunables feature is now enabled by default. This allows users to tweak
1888 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
1890 * New function reallocarray, which resizes an allocated block (like realloc)
1891 to the product of two sizes, with a guaranteed clean failure upon integer
1892 overflow in the multiplication. Originally from OpenBSD, contributed by
1893 Dennis Wölfing and Rüdiger Sonderfeld.
1895 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
1896 These are extended versions of preadv and pwritev, respectively, taking an
1897 additional flags argument. The set of supported flags depends on the
1898 running kernel; full support currently requires kernel 4.7 or later.
1900 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
1901 create a new session ID for the spawned process. This feature is
1902 scheduled to be added to the next major revision of POSIX; for the time
1903 being, it is available under _GNU_SOURCE.
1905 * errno.h is now safe to use from C-preprocessed assembly language on all
1906 supported operating systems. In this context, it will only define the
1907 Exxxx constants, as preprocessor macros expanding to integer literals.
1909 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
1910 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
1911 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
1912 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
1914 To compile programs that use this feature, the compiler must support
1915 128-bit floating point with the type name _Float128 (as defined by TS
1916 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
1917 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
1918 must be defined to make the new interfaces visible.
1920 The new functions and macros correspond to those present for other
1921 floating-point types (except for a few obsolescent interfaces not
1922 supported for the new type), with F128 or f128 suffixes; for example,
1923 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
1924 printf or scanf formats for the new type; the strfromf128 and strtof128
1925 interfaces should be used instead.
1927 Deprecated and removed features, and other changes affecting compatibility:
1929 * The synchronization that pthread_spin_unlock performs has been changed to
1930 now be equivalent to a C11 atomic store with release memory order to the
1931 spin lock's memory location. Previously, several (but not all)
1932 architectures used stronger synchronization (e.g., containing what is
1933 often called a full barrier). This change can improve performance, but
1934 may affect odd fringe uses of spin locks that depend on the previous
1935 behavior (e.g., using spin locks as atomic variables to try to implement
1936 Dekker's mutual exclusion algorithm).
1938 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
1941 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
1942 will only be built and installed when the GNU C Library is configured with
1943 --enable-obsolete-rpc. This allows alternative RPC implementations, such
1944 as TIRPC or rpcsvc-proto, to be used.
1946 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
1947 libnss_compat, are deprecated, and will not be built or installed by
1950 The NIS(+) support library, libnsl, is also deprecated. By default, a
1951 compatibility shared library will be built and installed, but not headers
1952 or development libraries. Only a few NIS-related programs require this
1953 library. (In particular, the GNU C Library has never required programs
1954 that use 'gethostbyname' to be linked with libnsl.)
1956 Replacement implementations based on TIRPC, which additionally support
1957 IPv6, are available from <https://github.com/thkukuk/>. The configure
1958 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
1959 name service modules, to be built and installed.
1961 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
1962 support is enabled, the configured recursive resolver must support EDNS.
1963 (Responding to EDNS-enabled queries with responses which are not
1964 EDNS-enabled is fine, but FORMERR responses are not.)
1966 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
1967 servers have not supported this opcode for a long time.
1969 * The _res_opcodes variable has been removed from libresolv. It had been
1970 exported by accident.
1972 * <string.h> no longer includes inline versions of any string functions,
1973 as this kind of optimization is better done by the compiler. The macros
1974 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
1976 * The nonstandard header <xlocale.h> has been removed. Most programs should
1977 use <locale.h> instead. If you have a specific need for the definition of
1978 locale_t with no other declarations, please contact
1979 libc-alpha@sourceware.org and explain.
1981 * The obsolete header <sys/ultrasound.h> has been removed.
1983 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
1985 * The obsolete function cfree has been removed. Applications should use
1988 * The stack_t type no longer has the name struct sigaltstack. This changes
1989 the C++ name mangling for interfaces involving this type.
1991 * The ucontext_t type no longer has the name struct ucontext. This changes
1992 the C++ name mangling for interfaces involving this type.
1994 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
1995 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
1996 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
1997 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
1998 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
1999 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2000 fpregset_t type no longer has the name struct fpu. This changes the C++
2001 name mangling for interfaces involving those types.
2003 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2004 synced with the kernel:
2006 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2007 are not supported on this architecture and have been removed.
2009 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2010 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2011 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2013 Programs that assume the GET/SETREGS ptrace requests are universally
2014 available will now fail to build, instead of malfunctioning at runtime.
2016 Changes to build and runtime requirements:
2018 * Linux kernel 3.2 or later is required at runtime, on all architectures
2019 supported by that kernel. (This is a change from version 2.25 only for
2022 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2024 * On most architectures, GCC 4.9 or later is required to build the GNU C
2025 Library. On powerpc64le, GCC 6.2 or later is required.
2027 Older GCC versions and non-GNU compilers are still supported when
2028 compiling programs that use the GNU C Library. (We do not know exactly
2029 how old, and some GNU extensions to C may be _de facto_ required. If you
2030 are interested in helping us make this statement less vague, please
2031 contact libc-alpha@sourceware.org.)
2033 Security related changes:
2035 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2036 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2038 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2039 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2041 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2042 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2045 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2046 fixed (CVE-2017-12133).
2048 The following bugs are resolved with this release:
2050 [984] network: Respond to changed resolv.conf in gethostbyname
2051 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2052 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2054 [12189] libc: __stack_chk_fail should not attempt a backtrace
2056 [14096] time: Race condition on timezone/tst-timezone.out
2057 [14172] localedata: az_IR: new locale
2058 [14995] build: glibc fails to build if gold is the default linker, even if
2060 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2061 [16637] network: inet_pton function is accepting IPv6 with bad format
2062 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2063 x86 and other generic code
2064 [16875] localedata: ko_KR: fix lang_name
2065 [17225] localedata: ar_SY: localized month names for May and June are
2067 [17297] localedata: da_DK: wrong date_fmt string
2068 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2069 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2070 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2071 [19066] localedata: ar_SA abbreviated day and month names are in English
2072 [19569] network: resolv: Support an arbitrary number of search domains
2073 [19570] network: Implement random DNS server selection in the stub
2075 [19838] locale: localedef fails on PA-RISC
2076 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2077 order of 0D36 and 0D37
2078 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2080 [20098] libc: FAIL: debug/backtrace-tst on hppa
2081 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2083 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2085 [20313] localedata: Update locale data to Unicode 9.0
2086 [20424] manual: Document how to provide a malloc replacement
2087 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2089 [20686] locale: Add el_GR@euro to SUPPORTED.
2090 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2091 failures consistently
2092 [21015] dynamic-link: Document and fix --enable-bind-now
2093 [21016] nptl: pthread_cond support is broken on hppa
2094 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2095 frame-pointer on i386
2096 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2098 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2099 [21088] libc: Build fails with --enable-static-nss
2100 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2101 generic c code is used
2102 [21109] libc: Tunables broken on big-endian
2103 [21112] math: powf has large ulp errors with base close to 1 and exponent
2105 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2107 [21120] malloc: glibc malloc is incompatible with GCC 7
2108 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2110 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2111 (-0.0) when linking with -lieee
2112 [21171] math: log10, log2 and lgamma return incorrect results
2113 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2114 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2115 [21207] localedata: ce_RU: update weekdays from CLDR
2116 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2117 [21217] localedata: Update months from CLDR-31
2118 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2119 [21243] libc: support_delete_temp_file should issue warning for failed
2121 [21244] libc: support resolv_test_start() socket fd close should be
2123 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2124 new posix_spawn implementation
2125 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2126 leads to lower CPU frequency
2127 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2128 [21261] libc: [sparc64] bits/setjmp.h namespace
2129 [21267] network: [mips] bits/socket.h IOC* namespace
2130 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2131 [21270] libc: mmap64 silently truncates large offset values
2132 [21275] libc: posix_spawn always crashes on ia64 now
2133 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2134 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2135 [21289] libc: Incorrect declaration for 32-bit platforms with
2136 _FILE_OFFSET_BITS=64 causes build error
2137 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2138 not support gethostbyname4_r
2139 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2141 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2143 [21340] libc: Support POSIX_SPAWN_SETSID
2144 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2145 [21359] network: ns_name_pack needs additional byte in destination buffer
2146 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2147 against fragmentation attacks (CVE-2017-12132)
2148 [21369] network: resolv: Remove EDNS fallback
2149 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2151 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2152 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2153 [21393] stdio: Missing dup3 error check in freopen, freopen64
2154 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2155 [21399] localedata: Bad description for U00EC in
2156 localedata/charmaps/CP1254
2157 [21411] malloc: realloc documentation error
2158 [21426] network: sys/socket.h uio.h namespace
2159 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2160 [21445] libc: signal.h bsd_signal namespace
2161 [21455] network: Network headers stdint.h namespace
2162 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2164 [21475] network: resolv: Overlong search path is truncated mid-label
2165 [21511] libc: sigstack namespace
2166 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2167 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2168 bits/syscall.h: No such file or directory
2169 [21517] libc: struct sigaltstack namespace
2170 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2171 [21533] localedata: Update locale data to Unicode 10.0
2173 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2174 junk at end of line, first unrecognized character is `@'
2175 [21538] libc: SIG_HOLD missing for XPG4
2176 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2177 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2178 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2179 [21543] libc: sigevent namespace
2180 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2181 size for general purpose registers in mcontext_t structure
2182 [21550] libc: sigwait namespace
2183 [21552] libc: XPG4 bsd_signal namespace
2184 [21554] libc: sigpause namespace
2185 [21560] libc: sys/wait.h signal.h namespace
2186 [21561] libc: waitid namespace
2187 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2188 '/usr/include/stdlib.h': Permission denied
2189 [21575] libc: sys/wait.h missing struct rusage definition
2190 [21584] libc: sigaltstack etc namespace
2191 [21597] libc: siginterrupt namespace
2192 [21607] math: hppa: FAIL: math/test-tgmath
2193 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2195 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2196 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2197 stack and heap (CVE-2017-1000366)
2198 [21625] libc: wait3 namespace
2199 [21654] nss: Incorrect pointer alignment in NSS group merge result
2201 [21657] network: Parse interface zone id for node-local multicast
2202 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2204 [21666] libc: .symver is used on common symbol
2205 [21668] network: resolv: res_init cross-thread broadcast introduces race
2207 [21687] math: tgmath.h totalorder, totalordermag return type
2208 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2210 [21696] libc: Incorrect assumption of of __cpu_mask in
2211 posix/sched_cpucount.c
2212 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2213 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2215 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2216 leading to relocation crash
2217 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2218 `resolv_conf_matches (resp, conf)' failed.
2219 [21710] localedata: Added Samoan language locale for Samoa
2220 [21711] localedata: Pashto yesstr/nostr locale are missing
2221 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2222 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2223 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2224 [21723] localedata: yesstr/nostr missing for Chinese language locale
2225 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2227 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2229 [21728] localedata: New Locale for Tongan language
2230 [21729] localedata: incorrect LC_NAME fields for hi_IN
2231 [21733] localedata: yesstr and nostr are missing for zh_HK
2232 [21734] localedata: Missing yesstr and nostr are for kw_GB
2233 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2234 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2235 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2236 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2238 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2240 [21749] localedata: Wrong abbreviated day name (“abday”) for
2242 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2243 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2244 [21759] localedata: missing yesstr and nostr for Tigrinya
2245 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2246 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2247 [21767] localedata: Missing Bislama locales
2248 [21768] localedata: Missing yesstr and nostr for aa_ET
2249 [21770] localedata: Missing Field in li_NL
2250 [21778] nptl: Robust mutex may deadlock
2251 [21779] libc: MicroBlaze segfaults when loading libpthread
2252 [21783] localedata: Fix int_select international_call_prefixes
2253 [21784] localedata: Inconsistency in country_isbn
2254 [21788] localedata: Missing Country Postal Abbreviations
2255 [21794] localedata: Added-country_isbn-for-Italy
2256 [21795] localedata: Add/Fix country_isbn for France
2257 [21796] localedata: Added country_isbn for Republic of Korea
2258 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2259 [21799] localedata: Added int_select international_call_prefixes
2260 [21801] localedata: Added int_select international_call_prefixes
2261 [21804] nptl: Double semicolon in thread-shared-types.h
2262 [21807] localedata: LC_ADDRESS fix for pap_CW
2263 [21808] localedata: Fix LC_ADDRESS for pap_AW
2264 [21821] localedata: Added country_name in mai_IN
2265 [21822] localedata: Fix LC_TIME for mai_IN
2266 [21823] localedata: missing yesstr, nostr for sa_IN
2267 [21825] localedata: Fix name_mrs for mag_IN
2268 [21828] localedata: 2.26 changelog should mention user visible changes
2270 [21835] localedata: Added Maithili language locale for Nepal
2271 [21838] localedata: Removed redundant data for the_NP
2272 [21839] localedata: Fix LC_MONETARY for ta_LK
2273 [21844] localedata: Fix Latin characters and Months Sequence.
2274 [21848] localedata: Fix mai_NP Title Name
2279 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2280 24731-2:2010, is supported to enable declarations of functions from that
2281 TR. Note that not all functions from that TR are supported by the GNU C
2284 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2285 18661-1:2014, is supported to enable declarations of functions and macros
2286 from that TS. Note that not all features from that TS are supported by
2289 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2290 18661-4:2015, is supported to enable declarations of functions and macros
2291 from that TS. Note that most features from that TS are not supported by
2294 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2295 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2296 Since the GNU C Library defaults to a much newer revision of POSIX, this
2297 will only affect programs that specifically request an old conformance
2298 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2299 see a change in the visible declarations, but a program compiled with
2300 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2303 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2304 defined by all multithreaded code, but glibc has not required this for
2307 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2308 means that in a future release, the macros “major”, “minor”, and “makedev”
2309 will only be available from <sys/sysmacros.h>.
2311 These macros are not part of POSIX nor XSI, and their names frequently
2312 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2313 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2314 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2317 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2318 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2319 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2321 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2322 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2323 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2324 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2325 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2326 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2327 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2328 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2329 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2330 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2331 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2334 * New <math.h> features are added from TS 18661-1:2014:
2336 - Signaling NaN macros: SNANF, SNAN, SNANL.
2338 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2339 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2340 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2342 - llogb functions: the llogb, llogbf and llogbl functions, and the
2343 FP_LLOGB0 and FP_LLOGBNAN macros.
2345 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2348 - Comparison macros: iseqsig.
2350 - Classification macros: iscanonical, issubnormal, iszero.
2352 - Total order functions: totalorder, totalorderf, totalorderl,
2353 totalordermag, totalordermagf, totalordermagl.
2355 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2357 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2358 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2360 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2361 are added to libc. They convert a floating-point number into string.
2363 * Most of glibc can now be built with the stack smashing protector enabled.
2364 It is recommended to build glibc with --enable-stack-protector=strong.
2365 Implemented by Nick Alcock (Oracle).
2367 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2368 intended to be used instead of memset() to erase sensitive data after use;
2369 the compiler will not optimize out calls to explicit_bzero even if they
2370 are "unnecessary" (in the sense that no _correct_ program can observe the
2371 effects of the memory clear).
2373 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2374 to float instead of double. This does not affect the ABI of any libraries
2375 that are part of the GNU C Library, but may affect the ABI of other
2376 libraries that use this type in their interfaces.
2378 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2379 float_t and double_t types are now defined to long double instead of float
2380 and double. These options are not the default, and this does not affect
2381 the ABI of any libraries that are part of the GNU C Library, but it may
2382 affect the ABI of other libraries that use this type in their interfaces,
2383 if they are compiled or used with those options.
2385 * The getentropy and getrandom functions, and the <sys/random.h> header file
2388 * The buffer size for byte-oriented stdio streams is now limited to 8192
2389 bytes by default. Previously, on Linux, the default buffer size on most
2390 file systems was 4096 bytes (and thus remains unchanged), except on
2391 network file systems, where the buffer size was unpredictable and could be
2392 as large as several megabytes.
2394 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2395 for the Linux quota interface which predates kernel version 2.4.22 has
2398 * The malloc_get_state and malloc_set_state functions have been removed.
2399 Already-existing binaries that dynamically link to these functions will
2400 get a hidden implementation in which malloc_get_state is a stub. As far
2401 as we know, these functions are used only by GNU Emacs and this change
2402 will not adversely affect already-built Emacs executables. Any undumped
2403 Emacs executables, which normally exist only during an Emacs build, should
2404 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2406 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2407 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2408 “no-ip6-dotint” had already been the default, and support for the
2409 “ip6-dotint” option was removed from the Internet in 2006.
2411 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2412 flag from <resolv.h> have been removed. The option relied on a
2413 backwards-incompatible DNS extension which was never deployed on the
2416 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2417 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2418 They were already unimplemented.
2420 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2421 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2422 removed again from the IETF name lookup interface specification in RFC
2423 2553. Applications should use getaddrinfo instead.
2425 * DNSSEC-related declarations and definitions have been removed from the
2426 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2427 decode the data part of DNSSEC record types. Previous versions of glibc
2428 only implemented minimal support for the previous version of DNSSEC, which
2429 is incompatible with the currently deployed version.
2431 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2432 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2433 <arpa/nameser.h> header file because the distinction between RR types and
2434 meta-RR types is not officially standardized, subject to revision, and
2435 thus not suitable for encoding in a macro.
2437 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2438 and rhook members of the res_state type in <resolv.h> have been removed.
2439 The glibc stub resolver did not support these hooks, but the header file
2440 did not reflect that.
2442 * For multi-arch support it is recommended to use a GCC which has
2443 been built with support for GNU indirect functions. This ensures
2444 that correct debugging information is generated for functions
2445 selected by IFUNC resolvers. This support can either be enabled by
2446 configuring GCC with '--enable-gnu-indirect-function', or by
2447 enabling it by default by setting 'default_gnu_indirect_function'
2448 variable for a particular architecture in the GCC source file
2451 * GDB pretty printers have been added for mutex and condition variable
2452 structures in POSIX Threads. When installed and loaded in gdb these pretty
2453 printers show various pthread variables in human-readable form when read
2454 using the 'print' or 'display' commands in gdb.
2456 * Tunables feature added to allow tweaking of the runtime for an application
2457 program. This feature can be enabled with the '--enable-tunables' configure
2458 flag. The GNU C Library manual has details on usage and README.tunables has
2459 instructions on adding new tunables to the library.
2461 * A new version of condition variables functions have been implemented in
2462 the NPTL implementation of POSIX Threads to provide stronger ordering
2465 * A new version of pthread_rwlock functions have been implemented to use a more
2466 scalable algorithm primarily through not using a critical section anymore to
2469 Security related changes:
2471 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2472 have been created with makecontext could fail to terminate due to a
2473 missing .cantunwind annotation. This has been observed to lead to a hang
2474 (denial of service) in some Go applications compiled with gccgo. Reported
2475 by Andreas Schwab. (CVE-2016-6323)
2477 * The DNS stub resolver functions would crash due to a NULL pointer
2478 dereference when processing a query with a valid DNS question type which
2479 was used internally in the implementation. The stub resolver now uses a
2480 question type which is outside the range of valid question type values.
2483 The following bugs are resolved with this release:
2485 [4099] stdio: Overly agressive caching by stream i/o functions.
2486 [7065] build: Support building glibc with -fstack-protector or -fstack-
2488 [9842] localedata: en_CA: incorrect date format
2489 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2490 before it started waiting
2491 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2492 [15765] nptl: sem_open is wrongly a cancellation point
2493 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2494 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2496 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2497 library linked with pthread
2498 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2499 "FIXME: Ingo" issue)
2500 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2501 [17252] libc: getrandom and getentropy syscall
2502 [17730] malloc: thread-local storage is sometimes improperly free()'d
2503 after being __libc_memalign()'d
2504 [18241] stdio: failed fseek on memstream does not set errno and can fail
2506 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2508 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2509 PTHREAD_PRIO_INHERIT mutex on ARM
2510 [18784] network: res_query and related function crash for special record
2511 type queries (CVE-2015-5180)
2512 [19380] math: strtod does not raise "inexact"
2513 [19387] string: Integer overflow in memchr
2514 [19390] string: Integer overflow in strncat
2515 [19398] build: linknamespace tests fail with massively parallel build
2516 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2518 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2519 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2520 [19514] libc: [PATCH] Fix spelling errors in spelling
2521 "implement"/"implementation" in several places
2522 [19582] network: Deprecate RES_USE_INET6
2523 [19673] manual: clog10 docs appear to be erroneous
2524 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2525 causes a segmentation fault
2526 [19826] libc: invalid pointer returned from __tls_get_addr with static
2528 [20016] network: resolv: Remove hooks support from the API
2529 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2531 [20033] math: [x86_64] vectorized math function don't call the __finite
2533 [20116] nptl: use after free in pthread_create
2534 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2535 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2537 [20311] nptl: please install proc_service.h
2538 [20366] libc: Compilation errors in installed headers in strict-compliance
2540 [20370] malloc: malloc: Arena free list management is still racy
2541 (incorrect fix in bug 19243)
2542 [20386] libc: assert (X = 0) does not result in GCC warning
2543 [20432] malloc: malloc: Minimize interface required for interposition
2544 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2545 in _Unwind_Backtrace (CVE-2016-6323)
2546 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2547 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2549 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2550 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2551 [20477] network: resolv: incorrect double-checked locking related to
2553 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2555 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2557 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2558 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2559 cause transition penalty
2560 [20517] math: sparcv9 missing fdiml compat symbol
2561 [20524] manual: strverscmp is inconsistent
2562 [20525] libc: <sys/quota.h> should be based on kernel headers
2563 [20539] math: GCC 7 -static -lm fails to link at -O3
2564 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2566 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2568 [20591] network: Remove obsolete DNSSEC support
2569 [20592] network: DNS resource record type classification macros in
2570 <arpa/nameser.h> are incorrect
2571 [20593] network: Update DNS RR type definitions
2572 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2573 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2575 [20629] network: libresolv: Remove support for bitstring labels
2577 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2578 assertion: "maxidx >= 2"
2579 [20660] math: [arm] Use VSQRT
2580 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2581 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2582 [20689] libc: Test for FMA should also check for AVX.
2583 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2584 [20715] math: iszero macro breaks existing code
2585 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2586 [20728] libc: powerpc: Missing TOC stub in clone
2587 [20729] build: glibc-2.24 fails to build for i486 with -Os
2588 [20750] build: Build fails with default PIE enabled gcc-6.x
2589 [20768] math: [alpha] sqrt fegetenv namespace
2590 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2592 [20787] math: float_t is defined as float incorrectly on x86_64 even if
2593 __FLT_EVAL_METHOD__ is 2
2594 [20790] network: rpcgen buffer overrun in get_prog_declaration
2595 [20822] nptl: race condition in __lll_unlock_elision on powerpc
2596 [20829] libc: crypt snprintf namespace
2597 [20847] libc: tst-vfork3 failure
2598 [20855] math: Default bits/mathdef.h has inappropriate float_t
2599 [20859] math: [sh4] FP_ILOGB0 invalid
2600 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2601 U+20AC), not same as GBK
2602 [20915] dynamic-link: global-dynamic TLS broken on aarch64
2603 [20916] math: pow handling of sNaN arguments
2604 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2605 [20919] math: Bad pow (qNaN, 0) result with -lieee
2606 [20940] math: hypot sNaN handling
2607 [20947] math: fmax, fmin sNaN handling
2608 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2609 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2611 [20971] string: powerpc64/power7 memchr overflows internal pointer check
2612 [20973] nptl: robust mutexes: Lost wake-ups
2613 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2614 [20978] nis: strlen on null pointer in nss_nisplus
2615 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2617 [21014] string: i686 memchr overflows internal pointer check
2618 [21019] libc: [mips] n32 lseek incorrect on overflow
2619 [21022] libc: [microblaze] __backtrace get_frame_size namespace
2620 [21026] libc: [MIPS] readahead syscall is broken on n64
2621 [21028] math: Fallback fesetexceptflag should always succeed
2622 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2623 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2625 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2626 [21061] librt: [microblaze] librt lost clock_* exports
2627 [21073] libc: tunables: insecure environment variables passed to
2628 subprocesses with AT_SECURE
2629 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2633 * The minimum Linux kernel version that this version of the GNU C Library
2634 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2635 kernel version 2.6.32 or later suffices (on architectures that already
2636 required kernel versions more recent than 3.2, those requirements remain
2637 unchanged). Linux 3.2 or later kernel headers are required on all
2640 * The pap_AN locale has been deleted. This has been deprecated for a long
2641 time. It has been replaced by pap_AW & pap_CW, both of which have long
2642 been included in previous releases.
2644 * The readdir_r and readdir64_r functions have been deprecated. It is
2645 recommended to use readdir and readdir64 instead.
2647 * The type “union wait” has been removed. It was deprecated in the early
2648 1990s and never part of POSIX. Application code should use the int type
2649 instead of “union wait”.
2651 * A new NSS action is added to facilitate large distributed system
2652 administration. The action, MERGE, allows remote user stores like LDAP
2653 to be merged into local user stores like /etc/groups in order to provide
2654 easy to use, updated, and managed sets of merged credentials. The new
2655 action can be used by configuring it in /etc/nsswitch.conf:
2656 group: files [SUCCESS=merge] nis
2657 Implemented by Stephen Gallagher (Red Hat).
2659 * The deprecated __malloc_initialize_hook variable has been removed from the
2662 * The long unused localedef --old-style option has been removed. It hasn't
2663 done anything in over 16 years. Scripts using this option can safely
2666 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2667 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
2668 return the next representable value in the direction of positive infinity
2669 and the nextdown functions return the next representable value in the
2670 direction of negative infinity. These are currently enabled as GNU
2673 Security related changes:
2675 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
2676 could result in a stack overflow when getnetbyname was called with an
2677 overly long name. (CVE-2016-3075)
2679 * Previously, getaddrinfo copied large amounts of address data to the stack,
2680 even after the fix for CVE-2013-4458 has been applied, potentially
2681 resulting in a stack overflow. getaddrinfo now uses a heap allocation
2682 instead. Reported by Michael Petlan. (CVE-2016-3706)
2684 * The glob function suffered from a stack-based buffer overflow when it was
2685 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2686 Reported by Alexander Cherepanov. (CVE-2016-1234)
2688 * The Sun RPC UDP client could exhaust all available stack space when
2689 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
2690 alloca plugin for GCC. (CVE-2016-4429)
2692 * The IPv6 name server management code in libresolv could result in a memory
2693 leak for each thread which is created, performs a failing naming lookup,
2694 and exits. Over time, this could result in a denial of service due to
2695 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
2697 The following bugs are resolved with this release:
2699 [1170] localedata: ne_NP: update Nepali locale definition file
2700 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2702 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2703 [6796] math: fdim() does not set errno on overflow
2704 [10354] libc: posix_spawn should use vfork() in more cases than presently
2705 [11213] localedata: localedata: add copyright disclaimer to locale files
2706 [12143] localedata: chr_US: new Cherokee locale
2707 [12450] localedata: sgs_LT: new locale
2708 [12676] localedata: ln_CD: new locale
2709 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2711 [13304] math: fma, fmaf, fmal produce wrong results
2712 [14259] build: --localedir arg to configure is ignored
2713 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2714 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2715 [14934] localedata: es_CL: wrong first weekday chilean locale
2716 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2718 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2720 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2721 [15368] nptl: raise() is not async-signal-safe
2722 [15479] math: ceil, floor, round and trunc raise inexact exception
2723 [15578] localedata: kk_KZ: various updates
2724 [16003] localedata: pap_AN: punt old locale
2725 [16137] localedata: iw_IL: punt old locale
2726 [16190] localedata: eo: new esperanto locale
2727 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2728 [16742] malloc: race condition: pthread_atfork() called before first
2729 malloc() results in unexpected locking behaviour/deadlocks
2730 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2732 [16983] localedata: postal_fmt does not allow %l and %n modifiers
2733 [17565] localedata: pt_PT: wrong (work-)week start
2734 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2735 [17950] build: Build fails with -msse
2736 [18205] localedata: be_BY*: wrong first_weekday and first_workday
2737 [18433] libc: posix_spawn does not return correctly upon failure to
2739 [18453] localedata: charmaps/IBM875: incorrect codes
2740 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2742 [18896] localedata: he_IL: improvements for currency
2743 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2744 Romanian locale data
2745 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2747 [19056] libc: Deprecate readdir_r
2748 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2750 [19198] localedata: nl_NL: small improvements for Dutch locales
2751 [19257] network: Per-thread memory leak in __res_vinit with IPv6
2752 nameservers (CVE-2016-5417)
2753 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2755 [19400] locale: Language missing in "iso-639.def", trivial fix in
2757 [19431] malloc: Deadlock between fflush, getdelim, and fork
2758 [19505] libc: Incorrect file descriptor validity checks in
2759 posix_spawn_file_actions_add{open,close,dup2}
2760 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2761 when using RTLD_NEXT
2762 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2763 `intl/{gettextP,loadinfo}.h'
2764 [19534] libc: execle, execlp may use malloc
2765 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
2766 [19573] network: res_nclose and __res_maybe_init disagree about name
2767 server initialization, breaking Hesiod
2768 [19575] localedata: Status of GB18030 tables
2769 [19581] localedata: sr_* date_fmt string contains additional newline
2770 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
2772 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
2773 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
2774 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
2775 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
2777 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
2779 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
2781 [19610] dynamic-link: ldconfig -X removes stale symbolic links
2782 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
2783 [19633] locale: strfmon_l applies global locale to number formatting
2784 [19642] network: Memory leak in getnameinfo
2785 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
2786 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
2788 [19654] math: [x86_64] Need testcase for BZ #19590 fix
2789 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
2791 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
2792 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
2794 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
2796 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
2798 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
2799 pointers and lengths in error-case.
2800 [19727] locale: Converting from/to UTF-xx with iconv() does not always
2801 report errors on UTF-16 surrogates values.
2802 [19755] nscd: nscd assertion failure in gc
2803 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
2804 [19759] libc: mempcpy shouldn't be inlined
2805 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
2806 [19765] libc: s390 needs an optimized mempcpy
2807 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
2808 NAME_MAX limit assumption (CVE-2016-1234)
2809 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
2810 [19787] network: Missing and incorrect truncation checks in getnameinfo
2811 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
2813 [19791] network: Assertion failure in res_query.c with un-connectable name
2815 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
2816 [19822] math: libm.so install clobbers old version
2817 [19825] network: resolv: send_vc can return uninitialized data in second
2818 response to getaddrinfo
2819 [19830] network: nss_dns: should check RDATA length against buffer length
2820 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
2821 confronted with A/AAAA records of invalid size
2822 [19837] nss: nss_db: No retries for some long lines with a larger buffer
2823 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
2824 [19853] stdio: Printing IBM long double in decimal with high precision is
2826 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
2827 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
2828 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
2830 [19865] network: Assertion failure or memory leak in
2831 _nss_dns_getcanonname_r
2832 [19868] network: nss_dns: netent code does not skip over non-PTR records
2833 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
2835 [19881] string: Improve x86-64 memset
2836 [19907] string: Incorrect memcpy tests
2837 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
2839 [19925] libc: termios.h XCASE namespace
2840 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
2841 [19929] libc: limits.h NL_NMAX namespace
2842 [19931] stdio: Memory leak in vfprintf
2843 [19957] libc: clone(CLONE_VM) access invalid parent memory
2844 [19963] localedata: en_IL: New locale
2845 [19989] stdio: stdio.h cuserid namespace
2846 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
2848 [19996] locale: langinfo.h nl_langinfo_l namespace
2849 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
2850 [20010] network: getaddrinfo: Stack overflow in hostent translation
2852 [20012] stdio: libio: fmemopen append mode failure
2853 [20014] stdio: stdio.h namespace for pre-threads POSIX
2854 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
2855 [20023] libc: fcntl.h timespec namespace
2856 [20024] math: [x86_64] vectorized sincos trashes the stack
2857 [20031] network: nss_hesiod: Heap overflow in get_txt_records
2858 [20041] time: sys/time.h timespec namespace
2859 [20043] libc: unistd.h missing cuserid for UNIX98 and before
2860 [20044] libc: unistd.h missing pthread_atfork for UNIX98
2861 [20051] libc: ttyslot in wrong header under wrong conditions
2862 [20054] libc: gethostname not declared for XPG4
2863 [20055] libc: termios.h missing tcgetsid for XPG4
2864 [20072] dynamic-link: x86 init_cpu_features is called twice in static
2866 [20073] libc: sys/stat.h fchmod namespace
2867 [20074] libc: stdlib.h rand_r namespace
2868 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
2869 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
2871 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
2872 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
2874 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
2875 [20119] libc: Wrong mask for processors level type from CPUID
2876 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
2877 AS not supporting AVX512
2878 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
2880 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
2881 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
2883 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
2884 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
2885 [20178] libc: posix_spawn{p} should not call exit
2886 [20191] stdio: libio: vtables hardening
2887 [20195] string: FMA4 detection requires CPUID execution with register
2889 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
2890 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
2892 [20212] math: acos (sNaN) returns sNaN
2893 [20213] math: asin (sNaN) returns sNaN
2894 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
2895 [20218] math: [i386] asinhl (sNaN) returns sNaN
2896 [20219] math: [i386] atanhl (sNaN) returns sNaN
2897 [20222] stdio: fopencookie: Mangle function pointers
2898 [20224] math: [i386] cbrtl (sNaN) returns sNaN
2899 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
2900 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
2902 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
2903 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
2904 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
2905 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
2906 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
2907 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
2908 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
2909 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
2910 [20240] math: modf (sNaN) returns sNaN
2911 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
2912 [20250] math: frexp (sNaN) returns sNaN
2913 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
2914 [20255] math: [i386] fdim, fdimf return with excess range and precision /
2916 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
2917 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
2918 subscript is below array bounds [-Werror=array-bounds]
2919 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
2920 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
2922 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
2923 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
2925 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
2926 "invalid" exceptions
2927 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
2928 [20316] localedata: id_ID: Februari instead of Pebruari
2929 [20327] string: POWER8 strcasecmp returns incorrect result
2930 [20347] math: Failure: Test: j0_downward (0xap+0)
2931 [20348] libc: FAIL: misc/tst-preadvwritev64
2932 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
2933 [20350] libc: There is no test for p{read,write}64
2934 [20357] math: Incorrect cos result for 1.5174239687223976
2935 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
2939 * Unicode 8.0.0 Support: Character encoding, character type info, and
2940 transliteration tables are all updated to Unicode 8.0.0, using new
2941 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
2942 These updates cause user visible changes, such as the fixes for bugs
2943 89, 16061, and 18568.
2945 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
2946 kernel-internal CPU set size. This means that requests that change the
2947 CPU affinity which failed before (for example, an all-ones CPU mask) will
2948 now succeed. Applications that need to determine the effective CPU
2949 affinities need to call sched_getaffinity or pthread_getaffinity_np after
2950 setting it because the kernel can adjust it (and the previous size check
2951 would not detect this in the majority of cases).
2953 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
2954 the following new symbols are used: fts64_children, fts64_close,
2955 fts64_open, fts64_read and fts64_set.
2957 * getaddrinfo now detects certain invalid responses on an internal netlink
2958 socket. If such responses are received, an affected process will
2959 terminate with an error message of "Unexpected error <number> on netlink
2960 descriptor <number>" or "Unexpected netlink response of size <number> on
2961 descriptor <number>". The most likely cause for these errors is a
2962 multi-threaded application which erroneously closes and reuses the netlink
2963 file descriptor while it is used by getaddrinfo.
2965 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
2966 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
2967 unnecessary serialization of memory allocation requests across threads.
2968 The defect is now corrected. Users should see a substantial increase in
2969 the concurent throughput of allocation requests for applications which
2970 trigger this bug. Affected applications typically create and
2971 destroy threads frequently. (Bug 19048 was reported and analyzed by
2974 * There is now a --disable-timezone-tools configure option for disabling the
2975 building and installing of the timezone related utilities (zic, zdump, and
2976 tzselect). This is useful for people who build the timezone data and code
2977 independent of the GNU C Library.
2979 * The obsolete header <regexp.h> has been removed. Programs that require
2980 this header must be updated to use <regex.h> instead.
2982 * The obsolete functions bdflush, create_module, get_kernel_syms,
2983 query_module and uselib are no longer available to newly linked binaries;
2984 the header <sys/kdaemon.h> has been removed. These functions and header
2985 were specific to systems using the Linux kernel and could not usefully be
2986 used with the GNU C Library on systems with version 2.6 or later of the
2989 * Optimized string, wcsmbs and memory functions for IBM z13.
2990 Implemented by Stefan Liebler.
2992 * Newly linked programs that define a variable called signgam will no longer
2993 have it set by the lgamma, lgammaf and lgammal functions. Programs that
2994 require signgam to be set by those functions must ensure that they use the
2995 variable provided by the GNU C Library and declared in <math.h>, without
2996 defining their own copy.
2998 * The minimum GCC version that can be used to build this version of the GNU
2999 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3000 still be used to compile programs using the GNU C Library.
3002 Security related changes:
3004 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3005 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3007 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3008 the pointer guard feature. It is always enabled. Previously,
3009 LD_POINTER_GUARD could be used to disable security hardening in binaries
3010 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3013 * An integer overflow in hcreate and hcreate_r could lead to an
3014 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3016 * The catopen function no longer has unbounded stack usage. Reported by
3017 Max. (CVE-2015-8779)
3019 * The nan, nanf and nanl functions no longer have unbounded stack usage
3020 depending on the length of the string passed as an argument to the
3021 functions. Reported by Joseph Myers. (CVE-2014-9761)
3023 * A stack-based buffer overflow was found in libresolv when invoked from
3024 libnss_dns, allowing specially crafted DNS responses to seize control
3025 of execution flow in the DNS client. The buffer overflow occurs in
3026 the functions send_dg (send datagram) and send_vc (send TCP) for the
3027 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3028 family. The use of AF_UNSPEC triggers the low-level resolver code to
3029 send out two parallel queries for A and AAAA. A mismanagement of the
3030 buffers used for those queries could result in the response of a query
3031 writing beyond the alloca allocated buffer created by
3032 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3033 the overflow. Thanks to the Google Security Team and Red Hat for
3034 reporting the security impact of this issue, and Robert Holiday of
3035 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3037 The following bugs are resolved with this release:
3039 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3040 [887] math: Math library function "logb" and "nextafter" inconsistent
3041 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3042 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3043 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3044 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3046 [4404] localedata: German translation of "Alarm clock" is misleading
3047 [6799] math: nextafter() and nexttoward() doen't set errno on
3048 overflow/underflow errors
3049 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3051 [10432] nis: _nss_nis_setnetgrent assertion failure
3052 [11460] libc: fts has no LFS support
3053 [12926] network: getaddrinfo()/make_request() may spin forever
3054 [13065] nptl: Race condition in pthread barriers
3055 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3056 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3058 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3059 [14912] libc: Rename non-installed bits/*.h headers
3060 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3061 [15367] math: Let gcc use __builtin_isinf
3062 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3063 [15421] math: lgamma wrongly sets signgam for ISO C
3064 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3065 FE_INVALID with argument out of range
3066 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3068 [15786] dynamic-link: ifunc resolver functions can smash function
3070 [15918] math: Unnecessary check for equality in hypotf()
3071 [16061] localedata: Review / update transliteration data
3072 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3074 [16141] time: strptime %z offset restriction
3075 [16171] math: drem should be alias of remainder
3076 [16296] math: fegetround is pure?
3077 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3078 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3080 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3081 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3083 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3084 "Exception "Inexact" set" on ppc32
3085 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3086 [16517] math: Missing underflow exception from tanf/tan/tanl
3087 [16519] math: Missing underflow exception from sinhf
3088 [16520] math: Missing underflow exception from tanhf
3089 [16521] math: Missing underflow exception from exp2
3090 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3092 [16734] stdio: fopen calls mmap to allocate its buffer
3093 [16961] math: nan function incorrect handling of bad sequences
3094 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3095 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3096 [16985] locale: localedef: confusing error message when opening output
3098 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3099 [17197] locale: Redundant shift character in iconv conversion output at
3101 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3102 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3103 [17250] dynamic-link: static linking breaks nss loading
3104 (getaddrinfo/getpwnam/etc...)
3105 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3107 [17441] math: isnan() should use __builtin_isnan() in GCC
3108 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3109 (related to lock elision)
3110 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3111 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3112 [17887] time: strptime should be able to parse "+01:00" style timezones
3113 [17905] libc: catopen() Multiple unbounded stack allocations
3115 [18084] libc: backtrace (..., 0) dumps core on x86
3116 [18086] libc: nice() sets errno to 0 on success
3117 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3118 is too large (CVE-2015-8778)
3119 [18251] dynamic-link: SONAME missing when audit modules provides path
3120 [18265] libc: add attributes for wchar string and memory functions
3121 [18370] math: csqrt missing underflows
3122 [18421] libc: [hppa] read-only segment has dynamic relocations
3123 [18472] libc: Obsolete syscall wrappers should be compat symbols
3124 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3125 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3126 [18525] localedata: Remove locale timezone information
3127 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3128 [18568] localedata: Update locale data to Unicode 8.0
3129 [18589] locale: sort-test.sh fails at random
3130 [18595] math: ctan, ctanh missing underflows
3131 [18604] libc: assert macro-expands its argument
3132 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3133 contains a vector instruction exception.
3134 [18611] math: j1, jn missing errno setting on underflow
3135 [18618] localedata: sync Chechen locale definitions with other *_RU
3137 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3138 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3139 [18665] network: In send_dg, the recvfrom function is NOT always using the
3140 buffer size of a newly created buffer (CVE-2015-7547)
3141 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3143 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3145 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3146 [18699] math: tilegx cproj() for various complex infinities does not yield
3148 [18724] libc: Harden put*ent functions against data injection
3149 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3150 [18755] build: build errors with -DNDEBUG
3151 [18757] stdio: fmemopen fails to set errno on failure
3152 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3154 [18781] libc: openat64 lacks O_LARGEFILE
3155 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3156 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3157 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3158 [18790] math: [ldbl-128ibm] tanhl inaccurate
3159 [18795] libc: stpncpy fortification misses buffer lengths that are
3160 statically too large
3161 [18796] build: build fails for --disable-mathvec
3162 [18803] math: hypot missing underflows
3163 [18820] stdio: fmemopen may leak memory on failure
3164 [18823] math: csqrt spurious underflows
3165 [18824] math: fma spurious underflows
3166 [18825] math: pow missing underflows
3167 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3168 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3169 [18870] build: sem_open.c fails to compile with missing symbol
3171 [18872] stdio: Fix memory leak in printf_positional
3172 [18873] libc: posix_fallocate overflow check ineffective
3173 [18875] math: Excess precision leads incorrect libm
3174 [18877] libc: arm: mmap offset regression
3175 [18887] libc: memory corruption when using getmntent on blank lines
3176 [18918] localedata: hu_HU: change time to HH:MM:SS format
3177 [18921] libc: Regression: extraneous stat() and fstat() performed by
3179 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3180 binaries (CVE-2015-8777)
3181 [18951] math: tgamma missing underflows
3182 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3184 [18953] localedata: lt_LT: change currency symbol to the euro
3185 [18956] math: powf inaccuracy
3186 [18961] math: [i386] exp missing underflows
3187 [18966] math: [i386] exp10 missing underflows
3188 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3189 [18969] build: multiple string test failures due to missing locale
3191 [18970] libc: Reference of pthread_setcancelstate in libc.a
3192 [18977] math: float / long double Bessel functions not in XSI POSIX
3193 [18980] math: i386 libm functions return with excess range and precision
3194 [18981] math: i386 scalb*, ldexp return with excess range and precision
3195 [18982] stdio: va_list and vprintf
3196 [18985] time: Passing out of range data to strftime() causes a segfault
3198 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3199 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3200 [19012] locale: iconv_open leaks memory on error path
3201 [19016] math: clog, clog10 inaccuracy
3202 [19018] nptl: Mangle function pointers in tls_dtor_list
3203 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3204 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3205 [19048] malloc: malloc: arena free list can become cyclic, increasing
3207 [19049] math: [powerpc] erfc incorrect zero sign
3208 [19050] math: [powerpc] log* incorrect zero sign
3209 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3210 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3211 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3212 [19074] network: Data race in _res_hconf_reorder_addrs
3213 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3214 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3215 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3217 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3219 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3220 [19086] manual: posix_fallocate64 documented argument order is wrong.
3221 [19088] math: lround, llround missing exceptions close to overflow
3223 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3224 [19095] math: dbl-64 lrint incorrect for 64-bit long
3225 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3226 [19124] dynamic-link: ld.so failed to build with older assmebler
3227 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3228 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3229 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3230 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3231 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3232 pthread_setaffinity_np
3233 [19156] math: [ldbl-128] j0l spurious underflows
3234 [19164] nptl: tst-getcpu fails with many possible CPUs
3235 [19168] math: math/test-ildoubl and math/test-ldouble failure
3236 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3237 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3239 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3240 (FE_NOMASK_ENV) do not clear SSE exceptions
3241 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3242 _int_new_arena/reused_arena
3243 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3244 [19201] math: dbl-64 remainder incorrect sign of zero result
3245 [19205] math: bits/math-finite.h conditions do not match math.h and
3247 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3248 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3249 for C99-based standards
3250 [19212] libc: features.h not -Wundef clean
3251 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3253 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3254 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3255 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3257 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3258 "inexact" exceptions
3259 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3261 [19242] libc: strtol incorrect in Turkish locales
3262 [19243] malloc: reused_arena can pick an arena on the free list, leading
3263 to an assertion failure and reference count corruption
3264 [19253] time: tzset() ineffective when temporary TZ did not include DST
3266 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3267 [19270] math: [hppa] Shared libm missing __isnanl
3268 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3269 MAP_HUGETLB and MAP_STACK defines
3270 [19313] nptl: Wrong __cpu_mask for x32
3271 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3272 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3273 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3274 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3275 [19363] time: x32: times() return value wrongly truncates/sign extends
3277 [19367] dynamic-link: Improve branch prediction on Silvermont
3278 [19369] network: Default domain name not reset by res_ninit when "search"
3279 / "domain" entry is removed from resolv.conf
3280 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3282 [19385] localedata: bg_BG: time separator should be colon, not comma
3283 [19408] libc: linux personality syscall wrapper may erroneously return an
3284 error on 32-bit architectures
3285 [19415] libc: dladdr returns wrong names on hppa
3286 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3287 IBM905, IBM907, and IBM909
3288 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3289 [19443] build: build failures with -DDEBUG
3290 [19451] build: Make check fails on test-double-vlen2
3291 [19462] libc: Glibc failed to build with -Os
3292 [19465] math: Wrong code with -Os
3293 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3295 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3297 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3298 [19486] math: S390: Math tests fail with "Exception Inexact set".
3299 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3300 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3302 [19590] math: Fail to build shared objects that use libmvec.so functions.
3306 * The following bugs are resolved with this release:
3308 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3309 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3310 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3311 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3312 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3313 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3314 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3315 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3316 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3317 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3318 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3319 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3320 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3321 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3322 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3323 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3324 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3325 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3326 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3327 18657, 18676, 18694, 18696, 18887.
3329 * Cache information can be queried via sysconf() function on s390 e.g. with
3330 _SC_LEVEL1_ICACHE_SIZE as argument.
3332 * A buffer overflow in gethostbyname_r and related functions performing DNS
3333 requests has been fixed. If the NSS functions were called with a
3334 misaligned buffer, the buffer length change due to pointer alignment was
3335 not taken into account. This could result in application crashes or,
3336 potentially arbitrary code execution, using crafted, but syntactically
3337 valid DNS responses. (CVE-2015-1781)
3339 * The time zone file parser has been made more robust against crafted time
3340 zone files, avoiding heap buffer overflows related to the processing of
3341 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3342 large time zone data files. Overly long time zone specifiers in the TZ
3343 variable no longer result in stack overflows and crashes.
3345 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3346 for LD and GD on x86 and x86-64, has been implemented. You will need
3347 binutils-2.24 or later to enable this optimization.
3349 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3350 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3351 Hat). These updates cause user visible changes, such as the fix for bug
3354 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3355 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3356 condition in some applications.
3358 * Added vector math library named libmvec with the following vectorized x86_64
3359 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3361 The library can be disabled with --disable-mathvec. Use of the functions is
3362 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3363 Shared library libmvec.so is linked in as needed when using -lm (no need to
3364 specify -lmvec explicitly for not static builds).
3365 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3367 * A new fmemopen implementation has been added with the goal of POSIX
3368 compliance. The new implementation fixes the following long-standing
3369 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3370 old implementation is still present for use be by existing binaries.
3372 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3373 releases. It has been fixed to match 2.19 and older, but binaries built
3374 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3376 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3377 Contributed by Roland McGrath (Google).
3379 * The header <regexp.h> is deprecated, and will be removed in a future
3380 release. Use of this header will trigger a deprecation warning.
3381 Application developers should update their code to use <regex.h> instead.
3383 This header was formerly part of SUS, but was deprecated in 1994 and
3384 removed from the standard in 2001. Also, the glibc implementation
3385 leaks memory. See BZ#18681 for more details.
3389 * The following bugs are resolved with this release:
3391 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3392 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3393 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3394 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3395 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3396 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3397 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3398 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3399 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3400 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3403 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3404 too little memory for the to-be-scanned arguments and overflow the
3405 allocated buffer. The implementation now correctly computes the required
3406 buffer size when using malloc, and switches to malloc from alloca as
3409 * A new semaphore algorithm has been implemented in generic C code for all
3410 machines. Previous custom assembly implementations of semaphore were
3411 difficult to reason about or ensure that they were safe. The new version
3412 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3413 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3414 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3416 * Port to Altera Nios II has been contributed by Mentor Graphics.
3418 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3419 implementations for powerpc64/powerpc64le.
3420 Implemented by Adhemerval Zanella (IBM).
3422 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3423 and powerpc64le. This may improve lock scaling of existing programs on
3424 HTM capable systems. The lock elision code is only enabled with
3425 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3426 powerpc will issue a transaction abort on every syscall to avoid side
3427 effects being visible outside transactions.
3429 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3430 AArch64. Contributed by ARM Ltd.
3432 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3434 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3435 under certain input conditions resulting in the execution of a shell for
3436 command substitution when the application did not request it. The
3437 implementation now checks WRDE_NOCMD immediately before executing the
3438 shell and returns the error WRDE_CMDSUB as expected.
3440 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3441 processing format strings with a large number of format specifiers.
3443 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3444 infinite loop if the DNS response contained a PTR record of an unexpected
3447 * The minimum GCC version that can be used to build this version of the GNU
3448 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3449 still be used to compile programs using the GNU C Library.
3451 * The GNU C Library is now built with -Werror by default. This can be
3452 disabled by configuring with --disable-werror.
3454 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3456 * The obsolete sigvec function has been removed. This was the original
3457 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3458 programs have been using instead for about 25 years. Of course, ABI
3459 compatibility for old binaries using sigvec remains intact.
3461 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3462 with newer versions of bison.
3464 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3465 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3466 registers overlay two consecutive single-precision registers. MIPS32R2
3467 introduced a new FPU mode (FR=1) where double-precision registers extend the
3468 corresponding single-precision registers which is incompatible with the
3469 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3470 require the use of FR=1 making a transition necessary. New o32 ABI
3471 extensions enable users to migrate over time from the original o32 ABI
3472 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3473 tracks the ABI of any loaded object and verifies that new objects are
3474 compatible. Mode transitions will also be requested as required and
3475 unsupportable objects will be rejected. The ABI checks include both soft and
3476 hard float ABIs for o32, n32 and n64.
3478 GCC 5 with GNU binutils 2.25 onwards:
3479 It is strongly recommended that all o32 system libraries are built using the
3480 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3481 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3482 compiler using --with-fp-32=xx to set this by default.
3486 * The following bugs are resolved with this release:
3488 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3489 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3490 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3491 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3492 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3493 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3494 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3495 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3496 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3497 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3498 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3499 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3500 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3501 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3502 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3504 * Reverted change of ABI data structures for s390 and s390x:
3505 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3506 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3507 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3508 are preserved pointing straight to the same implementation as the old ones.
3509 Given that, new callers will simply provide a too-big buffer to these
3510 functions. Any applications/libraries out there that embed jmp_buf or
3511 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3512 against 2.19 headers will have to rebuilt again. This is necessary in any
3513 case to revert the breakage in their ABI caused by the glibc change.
3515 * Support for file description locks is added to systems running the
3516 Linux kernel. The standard file locking interfaces are extended to
3517 operate on file descriptions, not file descriptors, via the use of
3518 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3519 are associated with an open file instead of a process.
3521 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3523 * The minimum Linux kernel version that this version of the GNU C Library
3524 can be used with is 2.6.32.
3526 * Running the testsuite no longer terminates as soon as a test fails.
3527 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3528 with PASS or FAIL lines for individual tests. A summary of the results is
3529 printed, including a list of failing lists, and "make check" exits with
3530 error status if there were any unexpected failures. "make check
3531 stop-on-test-failure=y" may be used to keep the old behavior.
3533 * The am33 port, which had not worked for several years, has been removed
3536 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3537 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3538 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3539 conflicted with POSIX (support for which was removed in 2.19), the
3540 interfaces those macros enabled remain available when compiling with
3541 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3542 test macros defined.
3544 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3546 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3547 This may improve lock scaling of existing programs on TX capable systems.
3548 The lock elision code is only built with --enable-lock-elision=yes and
3549 then requires a GCC version supporting the TX builtins. With lock elision
3550 default mutexes are elided via __builtin_tbegin, if the cpu supports
3551 transactions. By default lock elision is not enabled and the elision code
3554 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3555 copy the path argument. This allowed programs to cause posix_spawn to
3556 deference a dangling pointer, or use an unexpected pathname argument if
3557 the string was modified after the posix_spawn_file_actions_addopen
3560 * All supported architectures now use the main glibc sysdeps directory
3561 instead of some being in a separate "ports" directory (which was
3562 distributed separately before glibc 2.17).
3564 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3565 On configurations that support it (all Linux configurations), it's now
3566 used regardless of the --enable-add-ons switch to configure. It is no
3567 longer possible to build such configurations without pthreads support.
3569 * Locale names, including those obtained from environment variables (LANG
3570 and the LC_* variables), are more tightly checked for proper syntax.
3571 setlocale will now fail (with EINVAL) for locale names that are overly
3572 long, contain slashes without starting with a slash, or contain ".." path
3573 components. (CVE-2014-0475) Previously, some valid locale names were
3574 silently replaced with the "C" locale when running in AT_SECURE mode
3575 (e.g., in a SUID program). This is no longer necessary because of the
3578 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3579 with application code using Intel MPX instructions. (With all previous
3580 versions, the MPX register state could be clobbered when making calls
3581 into or out of a shared library.) Note that while the new dynamic
3582 linker is compatible with all known x86 hardware whether or not it
3583 supports Intel MPX, some x86 instruction-set emulators might fail to
3584 handle the new instruction encodings. This is known to affect Valgrind
3585 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3586 release), and might affect other tools that do instruction emulation.
3588 * Support for loadable gconv transliteration modules has been removed.
3589 The support for transliteration modules has been non-functional for
3590 over a decade, and the removal is prompted by security defects. The
3591 normal gconv conversion modules are still supported. Transliteration
3592 with //TRANSLIT is still possible, and the //IGNORE specifier
3593 continues to be supported. (CVE-2014-5119)
3595 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3596 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3597 resulting a denial-of-service security vulnerability in applications which
3598 use functions related to iconv. (CVE-2014-6040)
3602 * The following bugs are resolved with this release:
3604 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3605 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3606 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3607 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3608 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3609 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3610 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3611 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3612 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3613 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3614 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3615 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3616 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3617 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3618 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3619 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3620 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3621 16431, 16453, 16474, 16506, 16510, 16529
3623 * Slovenian translations for glibc messages have been contributed by the
3624 Translation Project's Slovenian team of translators.
3626 * The public headers no longer use __unused nor __block. This change is to
3627 support compiling programs that are derived from BSD sources and use
3628 __unused internally, and to support compiling with Clang's -fblock
3629 extension which uses __block.
3631 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3632 large collation sequences to optimize multiple passes. This cache
3633 computation may overflow for large collation sequences and may cause a
3634 stack or buffer overflow. This is now fixed to use a slower algorithm
3635 which does not use a cache if there is an integer overflow.
3637 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3638 rules for large collation sequences to optimize multiple passes and falls
3639 back to alloca if malloc fails, resulting in a possible stack overflow.
3640 The implementation now falls back to an uncached collation sequence lookup
3643 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3644 initialized for static applications resulting in the security feature
3645 being disabled. The pointer guard is now correctly initialized to a
3646 random value for static applications. Existing static applications need
3647 to be recompiled to take advantage of the fix (bug 15754).
3649 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3650 to the d_name member of struct dirent, or omit the terminating NUL
3651 character. (Bugzilla #14699).
3653 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3654 aligned_alloc functions could allocate too few bytes or corrupt the
3655 heap when passed very large allocation size values (Bugzilla #15855,
3658 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3659 for AF_INET6 has been fixed (Bugzilla #16072).
3661 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3662 pap_CW, quz_PE, the_NP.
3664 * Substantially revised locales: gd_GB, ht_HT
3666 * The LC_ADDRESS field was updated to support country_car for almost all
3669 * ISO 1427 definitions were updated.
3671 * ISO 3166 definitions were updated.
3673 * The localedef utility now supports --big-endian and --little-endian
3674 command-line options to generate locales for a different system from that
3675 for which the C library was built.
3677 * Binary locale files now only depend on the endianness of the system for
3678 which they are generated and not on other properties of that system. As a
3679 consequence, binary files generated with new localedef may be incompatible
3680 with old versions of the GNU C Library, and binary files generated with
3681 old localedef may be incompatible with this version of the GNU C Library,
3682 in the following circumstances:
3684 + Locale files may be incompatible on m68k systems.
3686 + Locale archive files (but not separate files for individual locales) may
3687 be incompatible on systems where plain "char" is signed.
3689 * The configure option --disable-versioning has been removed. Builds with
3690 --disable-versioning had not worked for several years.
3692 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3693 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3695 * SystemTap probes for malloc have been introduced.
3697 * SystemTap probes for slow multiple precision fallback paths of
3698 transcendental functions have been introduced.
3700 * Support for powerpc64le has been added.
3702 * The soft-float powerpc port now supports e500 processors.
3704 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3706 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3707 set of header declarations that are enabled by default, even when other
3708 feature test macros or compiler options such as -std=c99 would otherwise
3709 disable some of those declarations.
3711 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3712 conflict with POSIX. The libbsd-compat library (which was a dummy library
3713 that did nothing) has also been removed.
3715 * Preliminary documentation about Multi-Thread, Async-Signal and
3716 Async-Cancel Safety has been added.
3718 * Change of ABI data structures for s390 and s390x:
3719 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3720 allow for future hardware extensions. All library functions that accept or
3721 return these structures were versioned in order to provide backwards
3722 compatibility with existing code. However, not all cases can be handled
3723 with interface versioning. If an application embeds either structure into
3724 another structure and that structure is passed to another compilation unit
3725 which expects the newer larger-sized object then any access to the new
3726 fields will result in undefined behaviour. Similarly any access to fields
3727 that were moved by the enlarging of the structures will cause undefined
3728 behaviour. To fix the undefined behaviour all objects that are part of the
3729 final in-memory image must agree on the size of structures, and this may
3730 require recompilation.
3734 * The following bugs are resolved with this release:
3736 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3737 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3738 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3739 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3740 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3741 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3742 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3743 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3744 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3745 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3746 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3747 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3748 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3751 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3752 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3753 Distributions can re-enable building and using pt_chown via the new configure
3754 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
3755 considerable security risks and should only be used if the distribution
3756 understands and accepts the risks.
3758 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3761 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3762 fixed (Bugzilla #15330).
3764 * Add support for calling C++11 thread_local object destructors on thread
3765 and program exit. This needs compiler support for offloading C++11
3766 destructor calls to glibc.
3768 * Improved worst case performance of libm functions with double inputs and
3771 * Support for priority inherited mutexes in pthread condition variables on
3772 non-x86 architectures.
3774 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
3776 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
3778 * Optimized string functions for ARM. Implemented by Will Newton and
3781 * Optimized libm functions for SPARC. Implemented by David S. Miller.
3783 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
3786 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
3787 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
3789 * Added a benchmark framework to track performance of functions in glibc.
3791 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
3792 It is based on draft TS 18661 and currently enabled as a GNU extension.
3794 * On Linux, the clock function now uses the clock_gettime system call
3795 for improved precision, rather than old times system call.
3797 * Added support for version-3 tz format files. This is needed when using
3798 the tz database release 2013e or later, and affects a few unusual cases --
3799 currently only TZ='America/Godthab' for time stamps after 2037.
3801 * Added new API functions pthread_getattr_default_np and
3802 pthread_setattr_default_np to get and set the default pthread
3803 attributes of a process.
3805 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
3806 This may improve lock scaling of existing programs on TSX capable systems.
3807 When the --enable-lock-elision=yes parameter is specified at configure
3808 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
3811 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
3812 availability). Implemented by Ryan S. Arnold.
3814 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
3818 * The following bugs are resolved with this release:
3820 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
3821 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
3822 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
3823 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
3824 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
3825 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
3826 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
3827 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
3828 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
3829 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
3830 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
3831 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
3832 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
3833 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
3834 14879, 14889, 14893, 14898, 14914.
3836 * Optimization of memcpy for MIPS.
3838 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
3839 EMFILE has been fixed (Bugzilla #14889).
3841 * The add-on ports collection is now distributed in the "ports" subdirectory
3842 of the main GNU C Library distribution, rather than separately.
3844 * Port to ARM AArch64 contributed by Linaro.
3846 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
3847 Optimized versions of memcpy, memset, and memcmp added for System z10 and
3849 Implemented by Andreas Krebbel.
3851 * The new function secure_getenv allows secure access to the environment,
3852 returning NULL if running in a SUID/SGID process. This function replaces
3853 the internal function __secure_getenv.
3855 * SystemTap static probes have been added into the dynamic linker.
3856 Implemented by Gary Benson.
3858 * Optimizations of string functions strstr, strcasestr and memmem.
3859 Implemented by Maxim Kuvyrkov.
3861 * The minimum Linux kernel version that this version of the GNU C Library
3862 can be used with is 2.6.16.
3864 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
3865 powerpc POWER7. Implemented by Will Schmidt.
3867 * New configure option --disable-nscd builds the C library such that it
3868 never attempts to contact the Name Service Caching Daemon (nscd).
3869 New configure option --disable-build-nscd avoids building nscd itself;
3870 this is the default if --disable-nscd is used.
3872 * Improved support for cross-compilation, including cross-testing and
3873 bootstrap builds without a previously built glibc.
3875 * Several testsuite tests are now able to test multiple IFUNC variants of an
3876 interface, rather than just testing the one that would be chooen by
3879 * New configure options --with-bugurl and --with-pkgversion, for
3880 distributors to use to embed their bug-reporting and package version
3881 information in --help and --version output.
3883 * The ttyname and ttyname_r functions on Linux now fall back to searching for
3884 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
3885 allows creation of chroots without the procfs mounted on /proc.
3887 * The `crypt' function now fails if passed salt bytes that violate the
3888 specification for those values. On Linux, the `crypt' function will
3889 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
3890 enabled, and fail on encrypted strings using the MD5 or DES algorithm
3891 when the mode is enabled.
3893 * The `clock_*' suite of functions (declared in <time.h>) is now available
3894 directly in the main C library. Previously it was necessary to link with
3895 -lrt to use these functions. This change has the effect that a
3896 single-threaded program that uses a function such as `clock_gettime' (and
3897 is not linked with -lrt) will no longer implicitly load the pthreads
3898 library at runtime and so will not suffer the overheads associated with
3899 multi-thread support in other code such as the C++ runtime library.
3901 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
3906 * The following bugs are resolved with this release:
3908 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
3909 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
3910 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
3911 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
3912 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
3913 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
3914 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
3915 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
3916 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
3917 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
3918 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
3919 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
3920 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
3921 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
3922 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
3923 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
3924 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
3925 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
3926 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
3927 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
3928 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
3929 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
3932 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
3933 configuring glibc with:
3934 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
3935 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
3936 Implemented by H.J. Lu.
3940 + define static_assert
3942 + do not declare gets
3944 + declare at_quick_exit and quick_exit also for ISO C11
3946 + aligned_alloc. NB: The code is deliberately allows the size parameter
3947 to not be a multiple of the alignment. This is a moronic requirement
3948 in the standard but it is only a requirement on the caller, not the
3951 + timespec_get added
3953 + uchar.h support added
3955 + CMPLX, CMPLXF, CMPLXL added
3957 Implemented by Ulrich Drepper.
3959 * Support for the IA-64 has been moved to ports.
3961 * Remove support for anything but ELF binary format
3963 * Checking versions of poll, ppoll added.
3964 Implemented by Ulrich Drepper.
3966 * More generic and 64-bit performance optimizations to math functions.
3967 Implemented by Ulrich Drepper.
3969 * New configure option --enable-obsolete-rpc makes the deprecated RPC
3970 headers and functions available at compile time as they were before
3971 version 2.14. This option will be removed at some time in the future
3972 after the TI-RPC library becomes fully sufficient for the needs of
3973 existing applications.
3975 * Compatibility code for Linux kernel versions before 2.4 has been removed.
3976 Note that glibc is not expected to work with any Linux kernel version
3979 * New header <sys/auxv.h> and function getauxval allowing easy access to
3980 the AT_* key-value pairs passed from the Linux kernel. The header also
3981 defines the HWCAP_* bits associated with the AT_HWCAP key.
3983 * New locales: mag_IN
3985 * New configure option --enable-systemtap builds SystemTap static probes
3986 into libc for setjmp and longjmp and into libpthread for various operations.
3987 So far the setjmp/longjmp probes and some of the libpthread probes are
3988 provided only for i*86 and x86_64.
3989 Implemented by Roland McGrath and Rayson Ho.
3991 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
3993 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
3996 * More optimized functions for SPARC. Implemented by David S. Miller.
3998 * Improved support for cross-compilation, especially bootstrap builds
3999 without a previously built glibc.
4001 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4002 Chris Metcalf from Tilera.
4004 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4005 now supported for ARM processors.
4007 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4008 as the name of the dynamic linker, to distinguish it from the
4009 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4011 * Support for CRIS has been removed from ports.
4013 * A new class of installed header has been documented for low-level
4014 platform-specific functionality. PowerPC added the first instance with a
4015 function to provide time base register access. Contributed by Tulio
4016 Magno Quites Machado Filho.
4018 * ix86 configurations now install header files that are consistent with
4019 what x86-64 configurations install. These same header files can be used
4020 for -m32, -m64, or -mx32 builds.
4021 Contributed by H.J. Lu.
4023 * Math library bug fixes. A thorough audit of all open math library bugs was
4024 conducted by Joseph Myers. Significant progress was made on many math
4025 library bugs resulting in more accurate exceptions and function results.
4026 Many thanks to all those that contributed including Andreas Jaeger for his
4027 patch review and work on the x87 trigonometric instruction issues.
4029 * Timezone data is no longer installed. Timezone-related binaries and scripts
4030 will continue to be installed. Users should obtain their timezone data from
4031 their distribution provider or from the tzdata package at
4032 <ftp://munnari.oz.au/pub/>.
4036 * The following bugs are resolved with this release:
4038 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4039 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4040 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4041 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4042 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4043 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4044 13484, 13506, 13515, 13523, 13524, 13538, 13540
4046 * New program pldd to list loaded object of a process
4047 Implemented by Ulrich Drepper.
4049 * Add nss_db support back to glibc. No more dependency on Berkeley db
4050 and support for initgroups lookups.
4051 Implemented by Ulrich Drepper.
4053 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4054 Contributed by HJ Lu.
4056 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4057 Contributed by HJ Lu.
4059 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4060 on x86-32 and x86-64.
4061 Contributed by Liubov Dmitrieva.
4063 * Optimized strchr and strrchr for SSE on x86-32.
4064 Contributed by Liubov Dmitrieva.
4066 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4067 for x86-64 and x86-32.
4068 Contributed by Liubov Dmitrieva.
4070 * New interfaces: scandirat, scandirat64
4071 Implemented by Ulrich Drepper.
4073 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4074 Implemented by Ulrich Drepper.
4076 * nscd now also caches the netgroup database.
4077 Implemented by Ulrich Drepper.
4079 * Integrate libm with gcc's -ffinite-math-only option.
4080 Implemented by Ulrich Drepper.
4082 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4083 to math functions. Implemented by Ulrich Drepper.
4085 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4086 Implemented by Ulrich Drepper.
4088 * New Linux interfaces: process_vm_readv, process_vm_writev
4090 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4091 Implemented by Ulrich Drepper.
4093 * Optimized nearbyint and strcasecmp for PPC.
4094 Implemented by Adhemerval Zanella.
4096 * New locales: bho_IN, unm_US, es_CU, ta_LK
4100 * The following bugs are resolved with this release:
4102 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4103 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4104 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4105 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4106 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4107 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4108 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4109 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4110 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4111 12795, 12811, 12813, 12814, 12841
4113 * The RPC implementation in libc is obsoleted. Old programs keep working
4114 but new programs cannot be linked with the routines in libc anymore.
4115 Programs in need of RPC functionality must be linked against TI-RPC.
4116 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4118 Visible changes of this change include (obviously) the inability to link
4119 programs using RPC functions without referencing the TI-RPC library and the
4120 removal of the RPC headers from the glibc headers.
4121 Implemented by Ulrich Drepper.
4123 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4124 syncfs, setns, sendmmsg
4126 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4127 yue_HK, lij_IT, mhr_RU
4129 * New encodings: CP770, CP771, CP772, CP773, CP774
4131 * New program sotruss to trace calls through PLTs
4132 Implemented by Ulrich Drepper.
4134 * The malloc hook implementation is marked deprecated and will be removed
4135 from the default implementation in the next version. The design never
4136 worked ever since the introduction of threads. Even programs which do
4137 not create threads themselves can use multiple threads created internally.
4141 * The following bugs are resolved with this release:
4143 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4144 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4145 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4146 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4149 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4151 * POWER7 optimizations: memset, memcmp, strncmp
4153 * New optimized string functions for x86-64: strnlen (SSE2),
4154 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4155 Implemented by Ulrich Drepper.
4159 * The following bugs are resolved with this release:
4161 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4162 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4163 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4164 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4165 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4166 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4167 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4168 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4170 * New interfaces: pthread_getname_np, pthread_setname_np
4172 * New Linux interface: recvmmsg
4174 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4176 * The dynamic linker now recognizes supported ABI versions from the
4177 EI_ABIVERSION field in the ELF header.
4178 Implemented by Ulrich Drepper.
4180 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4181 will not be used to fill in password fields in the passwd.byname replies.
4182 Instead it is used to synthesize the shadow.byname table, should it be
4183 missing. This is a useful mode in some installations involving Solaris.
4184 Implemented by Ulrich Drepper.
4186 * New locales: kok_IN, sq_MK, cv_RU
4190 * The following bugs are resolved with this release:
4192 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4193 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4194 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4195 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4196 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4197 10789, 10817, 10823, 10840, 10847
4199 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4201 Implemented by Ulrich Drepper.
4203 * Checking version of longjmp added that fails if an uninitialized stack
4204 frame would be created. Implemented by Ulrich Drepper.
4206 * STT_GNU_IFUNC is now supported in static executables.
4207 Implemented by H.J. Lu.
4209 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4211 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4212 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4213 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4214 Contributed by H.J. Lu.
4216 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4217 Implemented by Ulrich Drepper.
4219 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4221 Contributed by H.J. Lu.
4223 * Support for fma instruction in AVX on x86-64.
4224 Implemented by H.J. Lu and Ulrich Drepper.
4226 * AVX support in x86-64 auditing support in ld.so.
4227 Implemented by H.J. Lu.
4229 * STB_GNU_UNIQUE support added.
4230 Implemented by Ulrich Drepper.
4232 * Implement second fallback mode for optimized DNS lookup for even more
4233 broken environments. If two requests from the same port are not
4234 handled correctly close the socket and open a new one before sending
4235 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4236 can be used to select this mode right away, instead of rediscovering the
4237 necessity is every process again.
4238 Implemented by Ulrich Drepper.
4240 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4241 Implemented by Adam Tkac.
4243 * Optimized iconv conversions for S390x.
4244 Implemented by Andreas Krebbel.
4246 * Using condvars with PI mutexes is now more efficient due to kernel
4247 support for requeueing to PI futexes. NPTL support added for x86-64.
4248 Implemented by Ulrich Drepper.
4250 * New locales: ps_AF, my_MM
4254 * The following bugs are resolved with this release:
4256 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4257 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4258 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4259 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4260 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4262 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4263 Implemented by Ulrich Drepper.
4265 * New Linux interfaces: accept4, fallocate, fallocate64.
4266 Implemented by Ulrich Drepper.
4268 * Correct declarations of string function when used in C++ code. This
4269 could lead to compile errors for invalid C++ code.
4271 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4274 * New POSIX 2008 interface: psiginfo
4275 Implemented by Ulrich Drepper.
4277 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4278 Implemented by Ulrich Drepper.
4280 * Support for selecting between multiple function definitions at runtime
4281 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4283 * The libcrypt library can now use the hash function implementations in
4284 NSS. Implemented by Ulrich Drepper.
4286 * The malloc implementation can be compiled to be less memory efficient
4287 but higher performing in multi-threaded programs.
4288 Implemented by Ulrich Drepper.
4290 * New locales: nan_TW@latin, ks_IN
4292 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4293 Implemented by Ulrich Drepper.
4295 * Extended printf hook support. It is possible to use user-defined types
4296 and extend existing format specifiers.
4297 Implemented by Ulrich Drepper.
4299 * Handling for group shadow files has been added.
4300 Implemented by Ulrich Drepper.
4302 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4303 servers (the case, e.g., for some people using the built-in DNS
4304 server in ADSL modems/routers). There is a once-per-process timeout
4305 in case of a broken server. To avoid it, users can run nscd or put
4306 'options single-request' in /etc/resolv.conf.
4307 Implemented by Ulrich Drepper.
4311 * The following bugs are resolved with this release:
4313 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
4314 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
4315 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
4316 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
4317 6968, 6974, 6980, 6995, 7008, 7009, 7029
4319 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4320 up at the same time. Implemented by Ulrich Drepper.
4322 * TLS descriptors for LD and GD on x86 and x86-64.
4323 Implemented by Alexandre Oliva.
4325 * getaddrinfo now handles DCCP and UDPlite.
4326 Implemented by Ulrich Drepper.
4328 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4329 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4330 Implemented by Ulrich Drepper.
4332 * New implementation of memmem, strstr, and strcasestr which is O(n).
4333 Implemented by Eric Blake.
4335 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4337 * Implement "e" option for popen to open file descriptor with the
4338 close-on-exec flag set. Implemented by Ulrich Drepper.
4340 * Implement "b" mode for fmemopen. In this mode writes writes don't
4341 implicitly add a NUL byte and seeks from the end of the buffer really
4342 use the buffer end, not the string length as the basis.
4343 Implemented by Ulrich Drepper.
4345 * Many functions, exported and internal, now atomically set the close-on-exec
4346 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4348 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4350 Implemented by Pravin Satpute.
4352 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4356 * The following bugs are resolved with this release:
4358 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4359 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4360 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4361 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4362 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4363 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4364 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4366 * New locales: bo_CN, bo_IN, shs_CA.
4368 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4370 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4371 Implemented by Pravin Satpute.
4373 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4375 * nscd caches now all timeouts for DNS entries
4376 Implemented by Ulrich Drepper.
4378 * nscd is more efficient and wakes up less often.
4379 Implemented by Ulrich Drepper.
4381 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4382 vdprintf, and obstack_vprintf.
4383 Implemented by Jakub Jelinek.
4385 * Faster memset for x86-64.
4386 Implemented by Harsha Jagasia and H.J. Lu.
4388 * Faster memcpy on x86.
4389 Implemented by Ulrich Drepper.
4391 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4392 Implemented by Ulrich Drepper.
4394 * Faster sqrt and sqrtf implemention for some PPC variants.
4395 Implemented by Steven Munroe.
4399 * The following bugs are resolved with this release:
4401 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4402 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4403 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4404 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4405 5071, 5103, 5104, 5112, 5113, 5184, 5186
4407 * More checking functions: fread, fread_unlocked, open*, mq_open.
4408 Implemented by Jakub Jelinek and Ulrich Drepper.
4410 * Extend fortification to C++. Implemented by Jakub Jelinek.
4412 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4413 by not recognizing 'a' as a modifier when those specs are requested.
4414 Implemented by Jakub Jelinek.
4416 * PPC optimizations to math and string functions.
4417 Implemented by Steven Munroe.
4419 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4420 options to be passed. Implemented by Ulrich Drepper.
4422 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4424 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4425 Implemented by Ulrich Drepper.
4427 * Handle private futexes in the NPTL implementation.
4428 Implemented by Jakub Jelinek and Ulrich Drepper.
4430 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4431 Implemented by Roland McGrath and Ulrich Drepper.
4433 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4435 * SHA-256 and SHA-512 based password encryption.
4436 Implemented by Ulrich Drepper.
4438 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4439 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4442 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4443 Implemented by Ulrich Drepper.
4447 * The following bugs are resolved with this release:
4449 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4450 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4451 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4452 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4453 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4454 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4455 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4458 * New Linux interfaces: epoll_pwait, sched_getcpu.
4460 * New generic interfaces: strerror_l.
4462 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4466 * The following bugs are resolved with this release:
4468 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4469 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4470 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4471 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4472 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4473 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4474 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4475 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4476 3225, 3251, 3252, 3253, 3273
4478 * For Linux, the sorting of addresses returned by getaddrinfo now also
4479 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4480 Implemented by Ulrich Drepper.
4482 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4483 Implemented by Ulrich Drepper.
4485 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4487 * New iconv module for MIK. Contributed by Alexander Shopov.
4489 * For sites with broken group and/or passwd database, the auto-propagate
4490 option of nscd can prevent creating ID lookup entries from the results
4491 of a name lookup and vice versa. This usually is no problem but some
4492 site might have problems with the default behavior.
4493 Implemented by Ulrich Drepper.
4495 * Iterating over entire database in NIS can be slow. With the
4496 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4497 to trade time for memory. The entire database will be read at once.
4498 Implemented by Ulrich Drepper.
4500 * The interfaces introduced in RFC 3542 have been implemented by
4503 * Support for the new ELF hash table format was added by Ulrich Drepper.
4505 * Support for priority inheritance mutexes added by Jakub Jelinek and
4508 * Support for priority protected mutexes added by Jakub Jelinek.
4510 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4511 or_IN, csb_PL, fy_NL, sr_ME.
4515 * More overflow detection functions.
4517 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4518 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4520 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4521 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4522 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4523 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4524 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4525 by Masahide Washizawa.
4527 * It is now possible to install audit libraries for the dynamic linker using
4528 LD_AUDIT. Implemented by Ulrich Drepper.
4530 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4531 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4532 For a libc and libpthread that works well on Linux 2.4 kernels, we
4533 recommend using the stable 2.3 branch.
4535 * The new function open_wmemstream acts like open_memstream,
4536 but uses a wchar_t wide character buffer.
4538 * The new function ppoll is an improved version of poll, similar to pselect.
4540 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4541 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4542 renameat, unlinkat, linkat, symlinkat, readlinkat.
4544 * New Linux kernel system calls: unshare,
4545 inotify_init, inotify_add_watch, inotify_rm_watch.
4547 * The euidaccess function is now also known by the alias eaccess,
4548 for compatibility with some other systems.
4550 * Timezone data updated to 2006b version.
4554 * The following bugs are resolved with this release:
4556 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4557 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4558 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4559 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4560 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4561 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4563 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4565 * As of this release, GCC 4 can be used to compile the C Library.
4567 * Timezone data updated to 2005m version.
4571 * The following bugs are resolved with this release:
4573 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4574 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4575 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4576 777, 787, 821, 822, 823, 825
4578 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4582 * Support for RFC 3678. Real implementations exist only for Linux so far.
4583 Implemented by Ulrich Drepper.
4585 * nscd can now cache entries persistently. Expiring entries are reloaded.
4586 For speedups the cache can be shared in memory with client processes.
4587 Implemented by Ulrich Drepper.
4589 * nscd can now perform SELinux checks.
4590 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4592 * getaddrinfo queries are now cached. Canonical name lookup is performed
4594 Implemented by Ulrich Drepper.
4596 * The nothrow function attribute is used when headers are used by gcc when
4597 compiling C code. This can avoid significant amounts of exception
4600 * The malloc functions perform more error checking and are stricter when
4601 it comes to reacting on errors. The default action is to terminate
4602 the process after showing an error message. Implemented by Ulrich Drepper.
4604 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4605 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
4607 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
4608 namespaces using the new function dlmopen(). This feature is of course,
4609 like most other dynamic loading functionality, not available in statically
4610 linked applications. Implemented by Ulrich Drepper.
4612 * Low-overhead boundary checking variants of string and some stdio functions
4613 were added. These are to be used in conjunction with a gcc patch by
4614 Jakub Jelinek which adds calls to these functions if possible.
4615 Implemented by Jakub Jelinek and Ulrich Drepper.
4617 * Old code for several operating systems and machine architectures that
4618 have not been in working condition in a long time have been removed from
4619 the main source tree maintained by the GNU C Library's maintainers.
4620 These files are now reside in the separate `ports' source module
4621 that is usable as an add-on when building the library.
4625 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4626 interrogate the dynamic linker, compatible with the Solaris interface.
4628 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4629 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4631 * getifaddrs now uses the netlink interface on Linux to get its information.
4632 Implemented by Thorsten Kukuk.
4634 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4635 Implemented by Ulrich Drepper.
4637 * support for non-executable stacks on x86 has been added. Changes mostly
4640 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
4643 * getaddrinfo now performs destination address selection according to
4648 * Thread-safe interfaces for many functions that access locale data
4649 were added in version 2.3, but these features were omitted from NEWS.
4650 Many functions have variants with an `_l' suffix that take a `locale_t'
4651 object as a parameter rather than consulting the current locale.
4652 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4653 create and maintain `locale_t' objects. Additionally, the new function
4654 `uselocale' sets "the current locale" (as used by functions not so
4655 parameterized) set for an individual thread. These features were added
4656 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4658 * The functions getresuid, getresgid, setresuid, and setresgid, which
4659 have long been available on Linux, are now declared in <unistd.h>
4660 and are now also available on the Hurd.
4662 * ELF thread-local storage support (TLS) now works on x86-64.
4664 * The new dynamic string token $LIB is expanded in shared library names.
4665 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4667 * Aldy Hernandez contributed complete software floating point support for
4668 PowerPC machines with no FPU.
4670 * fexecve is implemented on Linux.
4672 * The `btowc' function should work at least twice as fast due to
4673 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
4675 * With approriate thread add-ons cancelable functions are now implemented
4676 in libc.so as well. No need to call the function in libpthread. This
4677 change allowed to finally disable the incorrect and expensive handling
4678 of weak definition in ld.so.
4680 * Yet more PLT entries in libc.so have been removed. We finally arrived
4681 at the bare minimum. Startup times improved appropriately.
4683 * Support for the new Linux/x86 system call interface was added. The
4684 AT_SYSINFO auxiliary vector entry is recognized and handled.
4688 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4691 * iconv (the program and the interface) now accepts empty names (excluding
4692 options like //TRANSLIT) to mean "use charset of current locale".
4694 * localedef can now transliterate characters in strings which are not in
4695 the provided charmap. The information from the input locale is used.
4697 * Prelinking support was added for ELF targets. This requires additional
4698 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
4700 * Read-only stdio streams now use mmap to speed up operation by eliminating
4701 copying and buffer underflows. To use add 'm' to the mode string of
4702 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
4704 * The malloc functions were completely rewritten by Wolfram Gloger based
4705 on Doug Lea's malloc-2.7.0.c.
4707 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4708 implementation of regex.
4710 * Bruno Haible upgraded the iconv and locale implementation to support
4713 * Contents of the LC_* and LANG environment variables in the CEN style are
4714 not recognized anymore. It never was used. Change by Ulrich Drepper.
4716 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4717 thread-local storage (TLS) ABI on some platforms.
4718 Changes by Ulrich Drepper. SH support by Kaz Kojima.
4720 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4721 EUC-JISX0213, and TSCII.
4723 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4724 BSD-compatible interface for getting all network interface addresses.
4725 Implementation for IPv4 by Roland McGrath.
4727 * Loading of locale data is faster due to the introduction of a locale
4728 archive. Implemented by Roland McGrath and Ulrich Drepper.
4730 * Startup times are significantly reduced by not using exported functions
4731 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
4734 * Steven Munroe contributed a port to PowerPC64/Linux.
4738 * The Hurd now uses the GNU libio implementation of stdio rather than the
4739 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4741 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4742 with the same behavior as the Linux system call of the same name.
4746 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4747 128-bit long double format.
4749 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4750 IBM1161, and IBM1162 charsets.
4752 * Andreas Jaeger contributed a port to x86-64/Linux.
4754 * Peter Bruin contributed a port to PowerPC/Hurd.
4756 * libc functions using I/O streams now can handle wide-oriented streams
4759 * optimizations in the dynamic linker. Binaries created by recent binutils
4760 versions start up quicker due to reduced time spent on relocations.
4762 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
4766 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
4767 asinh, atanh, j0 for the 128-bit long double format.
4769 * Bruno Haible updated all the code handling Unicode in some form to
4770 support Unicode 3.1.
4772 * Speed of regex for single-byte locales is back to previous levels.
4773 Patch by Isamu Hasegawa.
4775 * Alpha, SPARC, and IA-64 now also using floating stacks.
4777 * Startup time of internationalized applications greatly improved through
4778 iconv cache. Use iconvconfig to generate the cache file.
4779 Contributed by Ulrich Drepper.
4781 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
4782 severe performance problems. Patch by David Mosberger.
4784 * The Hurd port got a lot more functionality like AIO, various stdio
4785 extensions, etc. Mainly done by Roland McGrath.
4787 * mtrace can now lookup symbols in shared libraries.
4791 * Intel's IA-64 math library is largely integrated. It provides fast and
4792 accurate implementatations for most basic and standard math functions
4793 in float, double, and long double format.
4795 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
4796 and asin for the 96-bit long double format and asin, log, tan for the
4797 128-bit long double format.
4799 * The beginning of a last-bit accurate math library by IBM Haifa were added.
4800 The basic double functions exist today. Contributed by Abraham Ziv
4801 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
4802 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
4804 * An asynchronous name lookup library was added. The interface is designed
4805 after POSIX AIO. The proposal was circulated beforehand to get comments.
4806 No negative ones came in. Implemented by Ulrich Drepper.
4808 * Port to S390/64bit contributed by Martin Schwidefsky
4809 <schwidefsky@de.ibm.com>.
4811 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
4812 of functions for Linux/IA-64.
4814 * The RPC code is now thread safe. Threads can now use the same service
4815 of different services at the same time. Patch by Eric Norum
4816 <eric.norum@usask.ca> with some help by Ulrich Drepper.
4818 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
4819 family of functions for Linux/S390.
4821 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
4822 of functions for Linux/x86.
4824 * Port to Linux/CRIS contributed by Axis Communications.
4828 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
4829 we can now check for namespace violations and missing declarations. The
4830 result is that almost all headers are now Unix-compliant (as defined in
4831 the upcoming XPG6). The negative side is that some programs might need
4832 corrections, too, if they depend on the incorrect form of the headers in
4833 previous versions which defined too many symbols and included too many
4836 * regex now handles multibyte character sets correctly.
4837 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
4839 * iconv (the program) does now conform to the upcoming XPG6 and handles
4840 charmaps. Instead of the charset names the path of charmaps can be
4841 provided and the conversion happens based on this data.
4842 Contributed by Ulrich Drepper.
4844 * The locale program now provides detailed information about the installed
4849 only lists the names of the supported locales
4853 provides details such as country, language, and codeset name.
4854 Contributed by Ulrich Drepper.
4858 * The gencat program now parses the input file according to the charset
4859 selected by the LC_CTYPE category. This is important for stateful
4860 character sets. To make generating catalogs easier there is a way
4861 to overwrite the charset selected by the locale: before the first
4862 message or $ quote line the catalog can contain a line like
4864 $ codeset=ISO-8859-2
4866 to select the charset (ISO-8859-2 in this case).
4868 Implemented by Shinya Hanataka and Ulrich Drepper.
4870 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
4871 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
4872 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
4874 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
4875 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
4877 * The LANGUAGE environment variable is now ignored unless the locale is
4878 changed from the default "C" locale.
4880 * The usual bug fixes.
4884 * Greg McGary added runtime support for bounds checking using gcc's
4885 new -fbounded-pointers option. ix86 target is complete. PowerPC
4888 * Thorsten Kukuk added secure mode support to nscd.
4890 * The Berkeley db libraries have been removed.
4892 Related, the nss_db module is now in a separate package since it
4893 obviously requires a database library being available.
4895 * Wide character I/O streams implemented by Ulrich Drepper.
4897 * Functions from the extended socket API added by Ulrich Drepper.
4899 * Functions feenableexcept and fedisableexcept to control the
4900 behaviour of individual exceptions have been added by Andreas Jaeger.
4902 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
4904 * The resolver code has been updated from bind 8.2.3-T5B which supports
4905 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
4908 This change could in some situations effect backward compatibility. Since
4909 now `_res' is a thread-local instead of a global variable, modifying it
4910 in one thread does not have any effect in other threads.
4912 The resolver library was also extended to allow IPv6 as the transport
4913 protocol for the requests. This work was done by Stig Venaas.
4915 * Compatibility code for K&R C compilers has been removed from the
4916 header files. A ISO C compiler is needed to use the library
4917 (conforming to either C89 or C99 standard).
4919 * Complete rewrite of the localedef program to support multibyte character
4920 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
4921 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
4922 Implemented by Ulrich Drepper.
4924 Bruno Haible significantly improved the generation and use of the data
4925 structures for the wide character tables.
4927 * Plural handling in gettext implemented by Ulrich Drepper.
4929 * The utmp daemon has been removed.
4931 * The port to MIPS-Linux has been finished by Andreas Jaeger.
4933 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
4936 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
4938 * POSIX barriers implemented by Kaz Kylheku.
4940 * POSIX spawn function family implemented by Ulrich Drepper.
4942 * POSIX spinlocks are now available.
4944 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
4946 * the configure option --enable-kernel=X.Y.Z allows to strip out
4947 compatibility for kernel versions before X.Y.Z. This is currently only
4948 implemented for Linux.
4950 * the sockaddr_in6 structure changed. The IPv6 working group added a new
4951 field sin6_scope_id. This means that all programs using IPv6 should be
4952 recompiled. Don't expect binary compatibility with previous glibc
4955 * various conversion modules for IBM character sets contributed by
4958 * IA-64 port by Jes Sorensen and HJ Lu.
4972 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
4974 * New xdr functions are added; some rpc functions are now 64bit clean.
4976 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
4978 * Fixed known incompatibilities with glibc 2.0.
4980 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
4982 * Optimized a number of functions (especially the ELF dynamic loader).
4984 * Update timezone data files.
4986 * lots of charmaps corrections
4988 * some new locale definitions and charmaps
4993 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
4994 conform to POSIX member type requirements. Symbol versions have been
4995 adjusted as needed within the library, and for direct use by applications,
4996 but there is potential for problems if third-party libraries use
4997 struct timeval as part of their interface. This does not present
4998 a problem for X and other "essential" system libraries.
5000 * An additional locale model to support C++ Standard Library locale
5001 model and probably more was implemented by Ulrich Drepper.
5003 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5006 * Miles Bader provided the `argp' function family to support hierachical
5007 command line argument parsing, layered on top of getopt.
5009 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5011 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5014 * scanf recognizes the %a and %A format for scanning floating point numbers.
5016 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5017 information and interfaces for the available integer types.
5019 * about 130 new math functions were added to implement the ISO C9x math
5022 * the new header <complex.h> contains definitions of the complex math
5023 functions from ISO C 9X.
5025 * the new header <tgmath.h> defines generic macros to use complex or
5026 real valued functions.
5028 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5030 * Andreas Jaeger provided a test suite for the math library.
5032 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5034 * Ulrich Drepper added character set conversion functions (iconv).
5036 * Optimized string functions have been added.
5038 * The localedata addon is now part of glibc.
5040 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5042 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5043 daemon for NSS (nscd).
5045 Missing a better place here are some numbers on improvements. Under
5046 Linux 2.1.125 un-tar-ing the kernel sources takes
5050 using local files 12.19s 6.88s 22.91s
5052 using NIS 13.92s 8.91s 26.34s
5054 using NIS & nscd 10.37s 7.34s 25.30s
5056 using NIS+ 27.57s 30.37s 640.46s
5058 using NIS+ & nscd 10.25s 7.83s 26.51s
5060 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5062 Keep in mind that non-namelookup related operations dominate above times.
5063 It was just a common complain that using NIS+ unpacking the kernel is
5066 [1] The old nscd implementation is not available anymore since it was
5067 distributed with glibc up to version 2.0.98 and thus is now replaced.
5069 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5071 * Mark Kettenis provided a Hesiod NSS module.
5073 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5074 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5076 * rcmd can now handle netgroups (Dick Streefland).
5078 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5081 * Support for the IPv6 protocol has been added to the socket API, as per the
5082 latest draft standards.
5084 * Support for Linux 2.2 has been added.
5086 * Interface changes relative to the latest 2.0.x release:
5087 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5088 addseverity NEW: Unix98
5089 alphasort64 NEW: LFS
5090 argp_err_exit_status NEW: argp, GNU ext
5091 argp_error NEW: argp, GNU ext
5092 argp_failure NEW: argp, GNU ext
5093 argp_help NEW: argp, GNU ext
5094 argp_parse NEW: argp, GNU ext
5095 argp_program_bug_address NEW: argp, GNU ext
5096 argp_program_version NEW: argp, GNU ext
5097 argp_program_version_hook NEW: argp, GNU ext
5098 argp_state_help NEW: argp, GNU ext
5099 argp_usage NEW: argp, GNU ext
5100 authdes_create NEW: Secure RPC
5101 authdes_getucred NEW: Secure RPC
5102 authdes_pk_create NEW: Secure RPC
5103 backtrace NEW: GNU ext.
5104 backtrace_symbols NEW: GNU ext.
5105 backtrace_symbols_fd NEW: GNU ext.
5107 cacosf NEW: ISO C 9x
5108 cacosh NEW: ISO C 9x
5109 cacoshf NEW: ISO C 9x
5110 cacoshl NEW: ISO C 9x
5111 cacosl NEW: ISO C 9x
5118 casinf NEW: ISO C 9x
5119 casinh NEW: ISO C 9x
5120 casinhf NEW: ISO C 9x
5121 casinhl NEW: ISO C 9x
5122 casinl NEW: ISO C 9x
5124 catanf NEW: ISO C 9x
5125 catanh NEW: ISO C 9x
5126 catanhf NEW: ISO C 9x
5127 catanhl NEW: ISO C 9x
5128 catanl NEW: ISO C 9x
5129 cbc_crypt NEW: Secure RPC
5133 ccoshf NEW: ISO C 9x
5134 ccoshl NEW: ISO C 9x
5140 cimagf NEW: ISO C 9x
5141 cimagl NEW: ISO C 9x
5142 clearerr_locked REMOVED
5143 clntunix_create NEW: sunrpc ext
5145 clog10 NEW: ISO C 9x
5146 clog10f NEW: ISO C 9x
5147 clog10l NEW: ISO C 9x
5157 cprojf NEW: ISO C 9x
5158 cprojl NEW: ISO C 9x
5160 crealf NEW: ISO C 9x
5161 creall NEW: ISO C 9x
5166 csinhf NEW: ISO C 9x
5167 csinhl NEW: ISO C 9x
5170 csqrtf NEW: ISO C 9x
5171 csqrtl NEW: ISO C 9x
5175 ctanhf NEW: ISO C 9x
5176 ctanhl NEW: ISO C 9x
5178 des_setparity NEW: Secure RPC
5179 ecb_crypt NEW: Secure RPC
5180 endutxent NEW: Unix98
5182 exp10f NEW: ISO C 9x
5183 exp10l NEW: ISO C 9x
5187 fattach NEW: STREAMS
5188 fdetach NEW: STREAMS
5192 feclearexcept NEW: ISO C 9x
5193 fegetenv NEW: ISO C 9x
5194 fegetexceptflag NEW: ISO C 9x
5195 fegetround NEW: ISO C 9x
5196 feholdexcept NEW: ISO C 9x
5198 feraiseexcept NEW: ISO C 9x
5199 ferror_locked REMOVED
5200 fesetenv NEW: ISO C 9x
5201 fesetexceptflag NEW: ISO C 9x
5202 fesetround NEW: ISO C 9x
5203 fetestexcept NEW: ISO C 9x
5204 feupdateenv NEW: ISO C 9x
5205 fflush_locked REMOVED
5209 fgets_unlocked NEW: GNU ext.
5210 fileno_locked REMOVED
5222 fputc_locked REMOVED
5223 fputs_unlocked NEW: GNU ext.
5224 fread_unlocked NEW: GNU ext.
5229 fstatvfs NEW: Unix98
5233 ftruncate64 NEW: LFS
5235 fwrite_unlocked NEW: GNU ext.
5236 gai_strerror NEW: IPv6
5240 getchar_locked REMOVED
5242 getdate_err NEW: Unix98
5243 getdate_r NEW: GNU ext.
5245 getnameinfo NEW: IPv6
5246 getnetname NEW: Secure RPC
5247 getpmsg NEW: STREAMS
5248 getpt NEW: Unix98 PTY
5249 getrlimit64 NEW: LFS
5250 getutxent NEW: Unix98
5251 getutxid NEW: Unix98
5252 getutxline NEW: Unix98
5253 glob64 NEW: GNU ext.
5254 globfree64 NEW: GNU ext.
5255 gnu_get_libc_release NEW: GNU ext.
5256 gnu_get_libc_version NEW: GNU ext.
5257 grantpt NEW: Unix98 PTY
5258 host2netname NEW: Secure RPC
5260 iconv_close NEW: iconv
5261 iconv_open NEW: iconv
5262 if_freenameindex NEW: IPv6
5263 if_indextoname NEW: IPv6
5264 if_nameindex NEW: IPv6
5265 if_nametoindex NEW: IPv6
5266 in6addr_any NEW: IPv6
5267 in6addr_loopback NEW: IPv6
5268 inet6_isipv4mapped NEW: IPv6
5269 isastream NEW: STREAMS
5270 iswblank NEW: GNU ext.
5271 key_decryptsession NEW: Secure RPC
5272 key_decryptsession_pk NEW: Secure RPC
5273 key_encryptsession NEW: Secure RPC
5274 key_encryptsession_pk NEW: Secure RPC
5275 key_gendes NEW: Secure RPC
5276 key_get_conv NEW: Secure RPC
5277 key_secretkey_is_set NEW: Secure RPC
5278 key_setnet NEW: Secure RPC
5279 key_setsecret NEW: Secure RPC
5280 llrint NEW: ISO C 9x
5281 llrintf NEW: ISO C 9x
5282 llrintl NEW: ISO C 9x
5283 llround NEW: ISO C 9x
5284 llroundf NEW: ISO C 9x
5285 llroundl NEW: ISO C 9x
5290 lrintf NEW: ISO C 9x
5291 lrintl NEW: ISO C 9x
5292 lround NEW: ISO C 9x
5293 lroundf NEW: ISO C 9x
5294 lroundl NEW: ISO C 9x
5296 makecontext NEW: Unix98
5297 mempcpy NEW: GNU ext.
5300 modify_ldt NEW: kernel
5304 nearbyint NEW: ISO C 9x
5305 nearbyintf NEW: ISO C 9x
5306 nearbyintl NEW: ISO C 9x
5307 netname2host NEW: Secure RPC
5308 netname2user NEW: Secure RPC
5309 nexttoward NEW: ISO C 9x
5310 nexttowardf NEW: ISO C 9x
5311 nexttowardl NEW: ISO C 9x
5315 passwd2des NEW: Secure RPC
5317 pow10f NEW: GNU ext.
5318 pow10l NEW: GNU ext.
5321 printf_size NEW: GNU ext.
5322 printf_size_info NEW: GNU ext.
5323 profil_counter REMOVED
5324 pthread_mutexattr_getkind_np REPLACED
5325 pthread_mutexattr_setkind_np REPLACED
5326 ptsname NEW: Unix98 PTY
5327 ptsname_r NEW: Unix98 PTY
5329 putchar_locked REMOVED
5330 putgrent NEW: GNU ext.
5332 putpmsg NEW: STREAMS
5333 pututxline NEW: Unix98
5337 readdir64_r NEW: LFS
5338 remquo NEW: ISO C 9x
5339 remquof NEW: ISO C 9x
5340 remquol NEW: ISO C 9x
5342 roundf NEW: ISO C 9x
5343 roundl NEW: ISO C 9x
5345 scalbln NEW: ISO C 9x
5346 scalblnf NEW: ISO C 9x
5347 scalblnl NEW: ISO C 9x
5349 sendfile NEW: kernel
5350 setcontext NEW: Unix98
5351 setrlimit64 NEW: LFS
5352 setutxent NEW: Unix98
5354 sigignore NEW: Unix98
5355 sigqueue NEW: POSIX.1b
5356 sigrelse NEW: Unix98
5357 sigset NEW: POSIX.1b
5358 sigtimedwait NEW: POSIX.1b
5359 sigwaitinfo NEW: POSIX.1b
5360 sincos NEW: GNU ext.
5361 sincosf NEW: GNU ext.
5362 sincosl NEW: GNU ext.
5366 strcasestr NEW: GNU ext.
5367 strtoimax NEW: ISO C 9x
5368 strtoumax NEW: ISO C 9x
5369 strverscmp NEW: GNU ext.
5370 svcauthdes_stats NEW: Secure RPC
5371 svcunix_create NEW: sunrpc etx
5372 svcunixfd_create NEW: sunrpc ext
5373 swapcontext NEW: Unix98
5374 tcgetsid NEW: Unix98 PTY
5375 tdestroy NEW: GNU ext.
5376 tgamma NEW: ISO C 9x
5377 tgammaf NEW: ISO C 9x
5378 tgammal NEW: ISO C 9x
5382 truncf NEW: ISO C 9x
5383 truncl NEW: ISO C 9x
5385 unlockpt NEW: Unix98 PTY
5386 updwtmpx NEW: Unix98
5387 user2netname NEW: Secure RPC
5388 utmpxname NEW: Unix98
5389 versionsort NEW: GNU ext.
5390 versionsort64 NEW: GNU ext.
5392 wcscasecmp NEW: GNU ext.
5393 wcsncasecmp NEW: GNU ext.
5394 wcsnlen NEW: GNU ext.
5395 wcstoimax NEW: ISO C 9x
5396 wcstoll NEW: ISO C 9x
5397 wcstoull NEW: ISO C 9x
5398 wcstoumax NEW: ISO C 9x
5400 wordexp NEW: POSIX.2
5401 wordfree NEW: POSIX.2
5402 write_profiling REMOVED
5403 xdecrypt NEW: Secure RPC
5404 xdr_authdes_cred NEW: Secure RPC
5405 xdr_authdes_verf NEW: Secure RPC
5406 xdr_cryptkeyarg NEW: Secure RPC
5407 xdr_cryptkeyarg2 NEW: Secure RPC
5408 xdr_cryptkeyres NEW: Secure RPC
5409 xdr_getcredres NEW: Secure RPC
5410 xdr_key_netstarg NEW: Secure RPC
5411 xdr_key_netstres NEW: Secure RPC
5412 xdr_keybuf NEW: Secure RPC
5413 xdr_keystatus NEW: Secure RPC
5414 xdr_netnamestr NEW: Secure RPC
5415 xdr_sizeof NEW: Secure RPC
5416 xdr_unixcred NEW: sunrpc ext
5417 xencrypt NEW: Secure RPC
5418 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5429 * inet_ntoa is thread-safe
5431 * updwtmp is moved from libutil to libc
5433 * rewrite of cbrt function
5435 * update of timezone data
5449 * add atoll function
5451 * fix complex problems in Berkeley DB code
5453 * fix math functions
5457 * fixed lots of header problems (especially Linux/GNU specific)
5459 * dynamic loader preserves all registers
5461 * Roland McGrath provided support for handling of auxiliary objects in
5462 the ELF dynamic loader.
5464 * support for parallel builds is improved
5468 * GNU extensions are no longer declared by default. To enable them you
5469 must define the macro `_GNU_SOURCE' in your program or compile with
5472 * The library has changed from using GNU ld symbol aliases to using weak
5473 symbols where available. The ELF object file format supports weak
5474 symbols; GNU ld also supports weak symbols in the a.out format. (There
5475 is also now support for other GNU ld extensions in ELF. Use the
5476 `--with-elf' option to configure to indicate you have ELF, and
5477 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5478 of many files which contained only symbol aliases, reducing the size of
5479 the source and the compiled library; many other files were renamed to
5480 less cryptic names previously occupied by the symbol alias files.
5481 There is a new header file <elf.h> for programs which operate on
5482 files in the ELF format.
5484 * Converted to Autoconf version 2, so `configure' has more options.
5485 Run `configure --help' to see the details.
5487 * The library can now be configured to build profiling, highly-optimized
5488 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5489 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5490 `configure' enable building these extra libraries. The shared library is
5491 built by default when using both ELF and GNU ld. When shared libraries
5492 are enabled, the new library `-ldl' is available for arbitrary run-time
5493 loading of shared objects; its interface is defined in <dlfcn.h>. The
5494 new header file <link.h> gives access to the internals of the run-time
5495 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5496 application of same name on other systems and it provides information
5497 about dynamically linked binaries.
5499 * The C library now provides the run-time support code for profiling
5500 executables compiled with `-pg'. Programs can control the profiling code
5501 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5502 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5503 the support for this file format was contributed by David Mosberger-Tang.
5505 * The math code has been replaced with a math library based on fdlibm from
5506 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5507 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5508 functions. The math functions now reside in a separate library, so
5509 programs using them will need to use `-lm' their linking commands.
5511 * John C. Bowman contributed optimized ix87 assembler inline functions.
5513 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5514 mechanism similar to that found in Solaris 2. This is now used for the
5515 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5516 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5517 file controls what services are used for each individual database. This
5518 works by loading shared libraries with names specified in `nsswitch.conf',
5519 so service modules can be changed or added at any time without even
5520 relinking any program. Currently there are the file, db, and NIS based
5521 NSS services available.
5523 * The new functions `strtoq' and `strtouq' parse integer values from
5524 strings, like `strtol' and `strtoul', but they return `long long int' and
5525 `unsigned long long int' values, respectively (64-bit quantities).
5527 * The new functions `strtof' and `strtold' parse floating-point values from
5528 strings, like `strtod', but they return `float' and `long double' values,
5529 respectively (on some machines `double' and `long double' are the same).
5531 * Ulrich Drepper has contributed new implementations of the floating-point
5532 printing and reading code used in the `printf' family of functions and
5533 `strtod', `strtof', and `strtold'. These new functions are perfectly
5534 accurate, and much faster than the old ones.
5536 * The implementation of the POSIX locale model was completely rewritten by
5537 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5538 to compile the POSIX locale definition.
5540 * The former dummy implementations of the strcoll and strxfrm function are
5541 now replaced by fully functional code contributed by Ulrich Drepper. The
5542 collation information comes from the POSIX locale definitions.
5544 * The new header <langinfo.h> defines an interface for accessing
5545 various locale-dependent data (using the locale chosen with `setlocale').
5547 * Ulrich Drepper has contributed a new suite of functions for operation on
5548 wide-character and multibyte-character strings, in <wchar.h>;
5549 and classification and case conversion of wide characters, in <wctype.h>.
5550 These new functions are conforming to the ISO C, Amendement 1 specification.
5552 * There is now a second implementation of the standard I/O library available.
5553 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5554 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5556 * You can now use positional parameter specifications in format strings
5557 for the `printf' and `scanf' families of functions. For example,
5558 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5559 ``Number 6, Mr Jones''. This is mainly useful when providing different
5560 format strings for different languages, whose grammars may dictate
5561 different orderings of the values being printed. To support this
5562 feature, the interface for `register_printf_handler' has changed; see
5563 the header file <printf.h> for details.
5565 * The `printf' and `scanf' families of functions now understand a new
5566 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5567 to group numbers as indicated by the locale; for `scanf' and friends, this
5568 says to accept as valid only a number with all the proper grouping
5569 separators in the right places. In the default "C" locale, numbers are
5570 not grouped; but locales for specific countries will define the usual
5571 conventions (i.e. separate thousands with `,' in the US locale).
5573 * The pgrp functions have been regularized, slightly incompatibly but much
5574 less confusingly. The core functions are now `getpgid' and `setpgid',
5575 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5576 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5577 provided for compatibility. There is no longer an incompatible `getpgrp'
5578 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5580 * The new header file <fts.h> and suite of functions simplify programs that
5581 operate on directory trees. This code comes from 4.4 BSD.
5583 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5584 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5585 NSS scheme used in glibc.
5587 * There is a new malloc debugging hook `__memalign_hook'.
5589 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5590 `unsigned int' in <sys/types.h>. These are for compatibility only and
5591 their use is discouraged.
5593 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5594 done differently, so that it works even without GNU ld.
5596 * New function `euidaccess' checks allowed access to a file like `access',
5597 but using the effective IDs instead of the real IDs.
5599 * The time zone data files have been updated for the latest and greatest
5600 local time conventions of the countries of the world.
5602 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5605 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5606 for formatting floating-point numbers. They are provided only for
5607 compatibility; new programs should use `sprintf' instead. There are
5608 also equivalent function for the `long double' floating-point type and
5609 all functions also exist in a reentrant form.
5611 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5612 functions for maintaining the login-record files (primarily of use to
5613 system programs such as `login'), and convenient functions for
5614 allocating and initializing a pseudo-terminal (pty) device.
5616 * Ulrich Drepper has contributed new support for System V style
5617 shared memory and IPC on systems that support it.
5619 * Ulrich Drepper has contributed several miscellaneous new functions found
5620 in System V: The `hsearch' family of functions provide an effective
5621 implementation of hash tables; `a64l' and `l64a' provide a very simple
5622 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5625 * Ulrich Drepper has contributed new reentrant counterparts for the
5626 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5628 * Ulrich Drepper has contributed new, highly-optimized versions of several
5629 string functions for the i486/Pentium family of processors.
5631 * Ulrich Drepper has updated the Linux-specific code, based largely
5632 on work done in Hongjiu Lu's version of GNU libc for Linux.
5633 The GNU library now supports Linux versions 2.0.10 and later,
5634 using the ELF object file format (i[3456]86-*-linux).
5636 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5638 * David Mosberger-Tang and Richard Henderson have ported the C library
5639 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
5640 dynamic linking support for ELF/Alpha.
5642 * Richard Henderson contributed several Alpha optimized assembler function
5643 for arithmetic and string handling.
5645 * Ulrich Drepper has contributed a new set of message catalog functions to
5646 support multiple languages using the <libintl.h> interface, for use with
5647 his new package GNU gettext. Translation volunteers have contributed
5648 catalogs of the library's messages in Spanish, German, and Korean.
5650 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5651 program and the `catgets' function for reading the catalog files it
5652 creates. (The <libintl.h> interface is preferred; we include the
5653 <nl_types.h> interface using `catgets' only for source compatibility with
5654 programs already written to use it.)
5656 * New header file <values.h> gives SVID-compatible names for <limits.h>
5659 * Various new macros, declarations, and small header files for compatibility
5662 * New function `group_member' is a convenient way to check if a process has
5663 a given effective group ID.
5665 * When using GCC 2.7 and later, the socket functions are now declared in a
5666 special way so that passing an argument of type `struct sockaddr_in *',
5667 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5668 `struct sockaddr *' type, does not generate a type-clash warning.
5670 * New function `error' declared in header file <error.h> is a convenient
5671 function for printing error messages and optionally exiting; this is the
5672 canonical function used in GNU programs. The new functions `err', `warn',
5673 and friends in header file <err.h> are the canonical 4.4 BSD interface for
5674 doing the same thing.
5676 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5677 POSIX.2 `glob' function to do ~ and {...} expansion.
5679 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5680 `clearenv' which is used in POSIX.9 is also available.
5682 * New function `getsid' returns session ID number on systems that support it.
5684 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
5685 files <db.h> and <mpool.h> provide a rich set of functions for several
5686 types of simple databases stored in memory and in files, and <ndbm.h> is
5687 an old `ndbm'-compatible interface using the `db' functions. Link with
5688 `-ldb' to get these functions.
5690 * New macro `strdupa' copies a string like `strdup', but uses local stack
5691 space from `alloca' instead of dynamic heap space from `malloc'.
5693 * New function `strnlen' is like `strlen' but searches only a given maximum
5694 number of characters for the null terminator. `stpncpy', `strndup' and
5695 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5698 * New function `statfs' in header <sys/statfs.h>.
5700 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5701 provide convenient functions for operating on blocks of null-terminated
5704 * A new suite of functions in <utmp.h> handle all the details of reading
5705 and writing the utmp file.
5707 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5710 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5711 completely POSIX compliant and also implemented the extended functionality
5712 to handle alternate digit representation and alternate era date formats.
5714 * Ulrich Drepper provided an implementation of the `strptime' function
5715 defined in XPG4.2 which transforms a string into a `struct tm' value.
5717 * Paul Eggert provided the tzselect shell script as part of the timezone
5718 code. The shell script makes it easy to select the correct timezone
5721 * The implementation of the malloc family of functions is completely replaced
5722 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5723 The implementation uses the mmap function (if available) and it is
5724 optimized for the use in multi threaded programs.
5726 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5727 functions. This new functionality is usable by specifying a special
5728 salt string and it is compatible with implementation on *BSD systems.
5730 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5731 `getsubopt' to handle second level command line options, `bsd_signal'
5732 to access BSD style `signal' functionality, the obsolete `regexp' style
5735 * the `lchown' function is available on system which support this
5738 * The implementation of the shadow password handling function was contributed
5741 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5743 * POSIX.1g support was added. The <sys/select.h> header is available,
5744 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
5745 implementation of `getaddrinfo'.
5749 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5751 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5752 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
5754 * The new function `daemon' from 4.4 BSD is useful for server programs that
5755 want to put themselves in the background.
5757 * Joel Sherrill has contributed support for several standalone boards that
5758 run without an operating system.
5760 * `printf', `scanf' and friends now accept a `q' type modifier for long
5761 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
5763 * All of the code taken from BSD (notably most of the math and networking
5764 routines) has been updated from the BSD 4.4-Lite release.
5766 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
5768 * The new functions `getdomainname' and `setdomainname' fetch or change the
5769 YP/NIS domain name. These are system calls which exist on systems which
5772 * The time zone data files have been updated for the latest international
5775 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
5776 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
5780 * The C library now includes support for Sun RPC, from Sun's free
5781 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
5782 are included. (There is still no support for YP.)
5784 * Tom Quinn has contributed a port of the C library to SGI machines running
5785 Irix 4 (mips-sgi-irix4).
5787 * The new `lockf' function is a simplified interface to the locking
5788 facilities of `fcntl', included for compatibility.
5790 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
5792 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
5794 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
5797 * The error message printed by `assert' for a failed assertion now includes
5798 the name of the program (if using GNU ld) and the name of the calling
5799 function (with versions of GCC that support this).
5801 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
5803 * The library now includes the <sys/mman.h> header file and memory
5804 management functions `mmap', `munmap', `mprotect', `msync', and
5805 `madvise', on systems that support those facilities.
5807 * The interface for `mcheck' has changed slightly: the function called to
5808 abort the program when an allocation inconsistency is detected now takes
5809 an argument that indicates the type of failure. The new function
5810 `mprobe' lets you request a consistency check for a particular block at
5811 any time (checks are normally done only when you call `free' or `realloc'
5814 * It is now possible to easily cross-compile the C library, building on one
5815 system a library to run on another machine and/or operating system. All
5816 you need to do is set the variable `HOST_CC' in `configparms' to the
5817 native compiler for programs to run on the machine you are building on (a
5818 few generator programs are used on Unix systems); set `CC' to the
5821 * The new function `fexecve' (only implemented on the GNU system) executes
5822 a program file given a file descriptor already open on the file.
5826 * Brendan Kehoe has contributed most of a port to the DEC Alpha
5827 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
5829 * You can set the variable `libprefix' in `configparms' to specify a prefix
5830 to be prepended to installed library files; this makes it easy to install
5831 the GNU C library to be linked as `-lgnuc' or whatever.
5833 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
5834 copies a limited number of characters from a string, and returns the
5835 address of the last character written.
5837 * You no longer need to check for whether the installed `stddef.h' is
5838 compatible with the GNU C library. configure now checks for you.
5840 * You can now define a per-stream `fileno' function to convert the
5841 stream's cookie into an integral file descriptor.
5843 * ``malloc (0)'' no longer returns a null pointer. Instead, it
5844 allocates zero bytes of storage, and returns a unique pointer which
5845 you can pass to `realloc' or `free'. The behavior is undefined if
5846 you dereference this pointer.
5848 * The C library now runs on Sony NEWS m68k machines running either
5849 NewsOS 3 or NewsOS 4.
5851 * The new `syscall' function is a system-dependent primitive function
5852 for invoking system calls. It has the canonical behavior on Unix
5853 systems, including unreliable return values for some calls (such as
5854 `pipe', `fork' and `getppid').
5856 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
5857 to `EAGAIN', which is the preferred name. On systems whose kernels
5858 use two distinct codes, the C library now translates EWOULDBLOCK to
5859 EAGAIN in every system call function.
5863 * The GNU C Library Reference Manual is now distributed with the library.
5864 `make dvi' will produce a DVI file of the printed manual.
5865 `make info' will produce Info files that you can read on line using C-h i
5866 in Emacs or the `info' program.
5867 Please send comments on the manual to bug-glibc-manual@gnu.org.
5869 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
5871 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
5873 * Jason Merrill has contributed a port to the Sequent Symmetry running
5874 Dynix version 3 (i386-sequent-dynix).
5876 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
5877 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
5879 * New function `memory_warnings' lets you arrange to get warnings when
5880 malloc is running out of memory to allocate, like Emacs gives you.
5882 * The C library now contains the relocating allocator used in Emacs 19 for
5883 its editing buffers. This allocator (ralloc) minimizes allocation
5884 overhead and fragmentation by moving allocated regions around whenever it
5885 needs to. You always refer to a ralloc'd region with a "handle" (a
5886 pointer to a pointer--an object of type `void **').
5888 * There is a new `printf' format: `%m' gives you the string corresponding
5889 to the error code in `errno'.
5891 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
5892 or `%[' conversion, but instead of filling in a fixed-sized buffer you
5893 pass, the `a' modifier says to fill in a `char **' you pass with a
5896 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
5897 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
5898 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
5900 * `mkstemp' is a traditional Unix function to atomically create and open a
5901 uniquely-named temporary file.
5905 * The standard location for the file that says what the local timezone is
5906 has changed again. It is now `/usr/local/etc/localtime' (or more
5907 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
5909 * The distribution no longer contains any files with names longer than 14
5912 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
5913 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
5915 * New functions `ttyslot' and `syslog' from 4.4 BSD.
5919 * The configuration process has changed quite a bit. The `configure'
5920 script is now used just like the configuration scripts for other GNU
5921 packages. The `sysdeps' directory hierarchy is much rearranged.
5922 The file `INSTALL' explains the new scheme in detail.
5924 * The header files no longer need to be processed into ANSI C and
5925 traditional C versions. There is just one set of files to install, and
5926 it will work with ANSI or old C compilers (including `gcc -traditional').
5928 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
5929 MIPS DECStation running Ultrix 4.
5931 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
5932 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
5933 made itself into a shared library.
5935 * Yet further improved support for the i386, running 4.3 BSD-like systems
5936 (such as Mach 3 with the Unix single-server), or System V.
5938 * New function `strncasecmp' to do case-insensitive string comparison
5939 with limited length.
5941 * New function `strsep' is a reentrant alternative to `strtok'.
5943 * New functions `scandir' and `alphasort' for searching directories.
5945 * New function `setenv' is a better interface to `putenv'.
5947 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
5948 function for traversing a directory tree.
5950 * The GNU obstack package is now also part of the C library.
5951 The new function `open_obstack_stream' creates a stdio stream that
5952 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
5953 formatted output directly to an obstack.
5955 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
5956 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
5958 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
5960 * The new functions `strfry' and `memfrob' do mysterious and wonderful
5961 things to your strings.
5963 * There are some new test programs: test-fseek, testmb, and testrand.
5965 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
5966 These ports are not finished, but are a good starting place for really
5967 supporting those systems.
5969 * `/etc/localtime' is now the standard location for the file that says what
5970 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
5971 This follows the general principle that `/etc' is the place for all local
5972 configuration files.
5974 * The C library header files now use `extern "C"' when used by the C++
5975 compiler, so the C library should now work with C++ code.
5977 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
5978 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
5981 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
5982 function which uses the `merge sort' algorithm, and is said to be
5983 significantly faster than the old GNU `qsort' function. Merge sort is
5984 now the standard `qsort' function. The new algorithm can require a lot
5985 of temporary storage; so, the old sorting function is called when the
5986 required storage is not available.
5988 * The C library now includes Michael Glad's Ultra Fast Crypt, which
5989 provides the Unix `crypt' function, plus some other entry points.
5991 * The code and header files taken from 4.4 BSD have been updated with the
5992 latest files released from Berkeley.
5994 ----------------------------------------------------------------------
5995 Copyright information:
5997 Copyright (C) 1992-2020 Free Software Foundation, Inc.
5999 Permission is granted to anyone to make or distribute verbatim copies
6000 of this document as received, in any medium, provided that the
6001 copyright notice and this permission notice are preserved,
6002 thus giving the recipient permission to redistribute in turn.
6004 Permission is granted to distribute modified versions
6005 of this document, or of portions of it,
6006 under the above conditions, provided also that they
6007 carry prominent notices stating who last changed them.
6010 version-control: never