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 Deprecated and removed features, and other changes affecting compatibility:
32 * The deprecated <sys/sysctl.h> header and the sysctl function have been
33 removed. To support old binaries, the sysctl function continues to
34 exist as a compatibility symbol (on those architectures which had it),
35 but always fails with ENOSYS. This reflects the removal of the system
36 call from all architectures, starting with Linux 5.5.
38 * The sstk function is no longer available to newly linked binaries.
39 Its implementation always returned with a failure, and the function
40 was not declared in any header file.
42 * The legacy signal handling functions siginterrupt, sigpause, sighold,
43 sigrelse, sigignore and sigset, and the sigmask macro have been
44 deprecated. Applications should use the sigsuspend, sigprocmask and
45 sigaction functions instead.
47 * ldconfig now defaults to the new format for ld.so.cache. glibc has
48 already supported this format for almost 20 years.
50 Changes to build and runtime requirements:
52 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
53 long double redirects.
55 Security related changes:
57 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
58 corruption when they were passed a pseudo-zero argument. Reported by Guido
59 Vranken / ForAllSecure Mayhem.
61 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
62 out-of-bounds write when executed in a signal frame context.
64 CVE-2020-1752: A use-after-free vulnerability in the glob function when
65 expanding ~user has been fixed.
67 The following bugs are resolved with this release:
69 [The release manager will add the list generated by
70 scripts/list-fixed-bugs.py just before the release.]
76 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
77 enable features from the draft ISO C2X standard. Only some features from
78 this draft standard are supported by the GNU C Library, and as the draft
79 is under active development, the set of features enabled by this macro is
80 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
81 by compiling with "gcc -std=gnu2x".
83 * The <math.h> functions that round their results to a narrower type now
84 have corresponding type-generic macros in <tgmath.h>, as defined in TS
85 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
86 Clarification Request 13 to TS 18661-3.
88 * The function pthread_clockjoin_np has been added, enabling join with a
89 terminated thread with a specific clock. It allows waiting against
90 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
92 * New locale added: mnw_MM (Mon language spoken in Myanmar).
94 * The DNS stub resolver will optionally send the AD (authenticated data) bit
95 in queries if the trust-ad option is set via the options directive in
96 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
97 mode, the AD bit, as provided by the name server, is available to
98 applications which call res_search and related functions. In the default
99 mode, the AD bit is not set in queries, and it is automatically cleared in
100 responses, indicating a lack of DNSSEC validation. (Therefore, the name
101 servers and the network path to them are treated as untrusted.)
103 Deprecated and removed features, and other changes affecting compatibility:
105 * The totalorder and totalordermag functions, and the corresponding
106 functions for other floating-point types, now take pointer arguments to
107 avoid signaling NaNs possibly being converted to quiet NaNs in argument
108 passing. This is in accordance with the resolution of Clarification
109 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
110 floating-point arguments directly will continue to work.
112 * The obsolete function stime is no longer available to newly linked
113 binaries, and its declaration has been removed from <time.h>.
114 Programs that set the system time should use clock_settime instead.
116 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
117 in a future version of glibc. In this release, the header still exists
118 but calling ftime will cause a compiler warning. All programs should use
119 gettimeofday or clock_gettime instead.
121 * The gettimeofday function no longer reports information about a
122 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
123 many years, as it cannot handle the full complexity of the world's
124 timezones, but hitherto we have supported it on a best-effort basis.
125 Changes required to support 64-bit time_t on 32-bit architectures have
126 made this no longer practical.
128 As of this release, callers of gettimeofday with a non-null 'tzp' argument
129 should expect to receive a 'struct timezone' whose tz_minuteswest and
130 tz_dsttime fields are zero. (For efficiency reasons, this does not always
131 happen on a few Linux-based ports. This will be corrected in a future
134 All callers should supply a null pointer for the 'tzp' argument to
135 gettimeofday. For accurate information about the time zone associated
136 with the current time, use the localtime function.
138 gettimeofday itself is obsolescent according to POSIX. We have no plans
139 to remove access to this function, but portable programs should consider
140 using clock_gettime instead.
142 * The settimeofday function can still be used to set a system-wide time
143 zone when the operating system supports it. This is because the Linux
144 kernel reused the API, on some architectures, to describe a system-wide
145 time-zone-like offset between the software clock maintained by the kernel,
146 and the "RTC" clock that keeps time when the system is shut down.
148 However, to reduce the odds of this offset being set by accident,
149 settimeofday can no longer be used to set the time and the offset
150 simultaneously. If both of its two arguments are non-null, the call
151 will fail (setting errno to EINVAL).
153 Callers attempting to set this offset should also be prepared for the call
154 to fail and set errno to ENOSYS; this already happens on the Hurd and on
155 some Linux architectures. The Linux kernel maintainers are discussing a
156 more principled replacement for the reused API. After a replacement
157 becomes available, we will change settimeofday to fail with ENOSYS on all
158 platforms when its 'tzp' argument is not a null pointer.
160 settimeofday itself is obsolescent according to POSIX. Programs that set
161 the system time should use clock_settime and/or the adjtime family of
162 functions instead. We may cease to make settimeofday available to newly
163 linked binaries after there is a replacement for Linux's time-zone-like
166 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
167 the optional CAS instruction is implemented (for instance, LEON processors
168 are still supported, but SuperSPARC processors are not).
170 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
173 * If a lazy binding failure happens during dlopen, during the execution of
174 an ELF constructor, the process is now terminated. Previously, the
175 dynamic loader would return NULL from dlopen, with the lazy binding error
176 captured in a dlerror message. In general, this is unsafe because
177 resetting the stack in an arbitrary function call is not possible.
179 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
180 executable stack unless explicitly configured at build time to require
181 minimum kernel version 4.8 or newer. This is because executing
182 floating-point branches on a non-executable stack on Linux kernels prior to
183 4.8 can lead to application crashes for some MIPS configurations. While
184 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
185 expected to enable non-executable stack by default with PT_GNU_STACK by
186 default and is thus likely to trigger a crash on older kernels.
188 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
189 non-executable stack while dropping support for older kernels.
191 * System call wrappers for time system calls now use the new time64 system
192 calls when available. On 32-bit targets, these wrappers attempt to call
193 the new system calls first and fall back to the older 32-bit time system
194 calls if they are not present. This may cause issues in environments
195 that cannot handle unsupported system calls gracefully by returning
196 -ENOSYS. Seccomp sandboxes are affected by this issue.
198 Changes to build and runtime requirements:
200 * It is no longer necessary to have recent Linux kernel headers to build
201 working (non-stub) system call wrappers on all architectures except 64-bit
202 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
204 * The ChangeLog file is no longer present in the toplevel directory of the
205 source tree. ChangeLog files are located in the ChangeLog.old directory as
206 ChangeLog.N where the highest N has the latest entries.
208 Security related changes:
210 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
211 environment variable during program execution after a security
212 transition, allowing local attackers to restrict the possible mapping
213 addresses for loaded libraries and thus bypass ASLR for a setuid
214 program. Reported by Marcin KoĆcielnicki.
216 The following bugs are resolved with this release:
218 [12031] localedata: iconv -t ascii//translit with Greek characters
219 [15813] libc: Multiple issues in __gen_tempname
220 [17726] libc: [arm, sparc] profil_counter should be compat symbol
221 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
222 [19767] libc: vdso is not used with static linking
223 [19903] hurd: Shared mappings not being inherited by children processes
224 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
225 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
227 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
228 Symbols-A/B Unicode blocks
229 [23518] libc: Eliminate __libc_utmp_jump_table
230 [24026] malloc: malloc_info() returns wrong numbers
231 [24054] localedata: Many locales are missing date_fmt
232 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
233 [24304] dynamic-link: Lazy binding failure during ELF
234 constructors/destructors is not fatal
235 [24376] libc: RISC-V symbol size confusion with _start
236 [24682] localedata: zh_CN first weekday should be Monday per GB/T
238 [24824] libc: test-in-container does not install charmap files compatible
240 [24844] regex: regex bad pointer / leakage if malloc fails
241 [24867] malloc: Unintended malloc_info formatting changes
242 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
243 [24880] libc: login: utmp implementation uses struct flock with fcntl64
244 [24882] libc: login: pututline uses potentially outdated cache
245 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
246 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
248 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
250 [24930] dynamic-link: dlopen of PIE executable can result in
251 _dl_allocate_tls_init assertion failure
252 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
253 (stringop-overflow error)
254 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
255 functions other can lead to crashes
256 [24967] libc: jemalloc static linking causes runtime failure
257 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
259 [25035] libc: sbrk() failure handled poorly in tunables_strdup
260 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
261 [25097] libc: new -Warray-bounds with GCC 10
262 [25112] dynamic-link: dlopen must not make new objects accessible when it
263 still can fail with an error
264 [25139] localedata: Please add the new mnw_MM locale
265 [25149] regex: Array bounds violation in proceed_next_node
266 [25157] dynamic-link: Audit cookie for the dynamic loader is not
267 initialized correctly
268 [25189] libc: glibc's __glibc_has_include causes issues with clang
270 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
272 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
273 binaries (CVE-2019-19126)
274 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
276 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
278 [25232] string: <string.h> does not enable const correctness for strchr et
280 [25233] localedata: Consider "." as the thousands separator for sl_SI
282 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
283 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
284 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
286 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
287 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
289 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
290 (dl_initfirst) link map pointer
291 [25401] malloc: pvalloc must not have __attribute_alloc_size__
292 [25423] libc: Array overflow in backtrace on powerpc
293 [25425] network: Missing call to __resolv_context_put in
294 getaddrinfo.c:gethosts
301 * Unicode 12.1.0 Support: Character encoding, character type info, and
302 transliteration tables are all updated to Unicode 12.1.0, using
303 generator scripts contributed by Mike FABIAN (Red Hat).
305 * The dynamic linker accepts the --preload argument to preload shared
306 objects, in addition to the LD_PRELOAD environment variable.
308 * The twalk_r function has been added. It is similar to the existing
309 twalk function, but it passes an additional caller-supplied argument
310 to the callback function.
312 * On Linux, the getdents64, gettid, and tgkill functions have been added.
314 * Minguo (Republic of China) calendar support has been added as an
315 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
318 * The entry for the new Japanese era has been added for ja_JP locale.
320 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
321 pvalloc, memalign, and posix_memalign fail now with total object size
322 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
323 pointer subtraction within the allocated object, where results might
324 overflow the ptrdiff_t type.
326 * The dynamic linker no longer refuses to load objects which reference
327 versioned symbols whose implementation has moved to a different soname
328 since the object has been linked. The old error message, symbol
329 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
330 link time reference, is gone.
332 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
333 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
334 functions. These behave similarly to their "timed" equivalents, but also
335 accept a clockid_t parameter to determine which clock their timeout should
336 be measured against. All functions allow waiting against CLOCK_MONOTONIC
337 and CLOCK_REALTIME. The decision of which clock to be used is made at the
338 time of the wait (unlike with pthread_condattr_setclock, which requires
339 the clock choice at initialization time).
341 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
342 work, new resolvers can use a second argument which can be extended in
343 the future, currently it contains the AT_HWCAP2 value.
345 Deprecated and removed features, and other changes affecting compatibility:
347 * The copy_file_range function fails with ENOSYS if the kernel does not
348 support the system call of the same name. Previously, user space
349 emulation was performed, but its behavior did not match the kernel
350 behavior, which was deemed too confusing. Applications which use the
351 copy_file_range function can no longer rely on glibc to provide a fallback
352 on kernels that do not support the copy_file_range system call, and if
353 this function returns ENOSYS, they will need to use their own fallback.
354 Support for copy_file_range for most architectures was added in version
355 4.5 of the mainline Linux kernel.
357 * The functions clock_gettime, clock_getres, clock_settime,
358 clock_getcpuclockid, clock_nanosleep were removed from the librt library
359 for new applications (on architectures which had them). Instead, the
360 definitions in libc will be used automatically, which have been available
363 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
364 and <sys/stropts.h> have been removed.
366 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
367 resolver flag (deprecated in glibc 2.25) have been removed.
369 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
370 resolver have been removed from <resolv.h>.
372 * With --enable-bind-now, installed programs are now linked with the
375 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
376 configurations) has been removed, following the deprecation of this
377 subarchitecture in version 8 of GCC, and its removal in version 9.
379 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
380 header have been removed.
382 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
383 deprecated and will be removed from a future version of glibc.
384 Application should directly access /proc instead. For obtaining random
385 bits, the getentropy function can be used.
387 Changes to build and runtime requirements:
389 * GCC 6.2 or later is required to build the GNU C Library.
391 Older GCC versions and non-GNU compilers are still supported when
392 compiling programs that use the GNU C Library.
394 Security related changes:
396 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
397 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
398 has undefined behavior. On x32, the size_t argument may be passed
399 in the lower 32 bits of the 64-bit RDX register with non-zero upper
400 32 bits. When it happened with the sign bit of RDX register set,
401 memcmp gave the wrong result since it treated the size argument as
402 zero. Reported by H.J. Lu.
404 CVE-2019-9169: Attempted case-insensitive regular-expression match
405 via proceed_next_node in posix/regexec.c leads to heap-based buffer
406 over-read. Reported by Hongxu Chen.
408 The following bugs are resolved with this release:
410 [2872] locale: Transliteration Cyrillic -> ASCII fails
411 [6399] libc: gettid() should have a wrapper
412 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
413 [16976] glob: fnmatch unbounded stack VLA for collating symbols
414 [17396] localedata: globbing for locale by [[.collating-element.]]
415 [18035] dynamic-link: pldd does no longer work, enters infinite loop
416 [18465] malloc: memusagestat is built using system C library
417 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
418 invalid input drops valid char
419 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
420 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
421 [21897] localedata: Afar locales: Fix mon, abmon, and abday
422 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
423 [23352] malloc: __malloc_check_init still defined in public header
425 [23403] nptl: Wrong alignment of TLS variables
426 [23501] libc: nftw() doesn't return dangling symlink's inode
427 [23733] malloc: Check the count before calling tcache_get()
428 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
430 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
431 [23844] nptl: pthread_rwlock_trywrlock results in hang
432 [23983] argparse: Missing compat versions of argp_failure and argp_error
433 for long double = double
434 [23984] libc: Missing compat versions of err.h and error.h functions for
436 [23996] localedata: Dutch salutations
437 [24040] libc: riscv64: unterminated call chain in __thread_start
438 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
440 [24051] stdio: puts and putchar ouput to _IO_stdout instead of stdout
441 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
443 [24114] regex: regexec buffer read overrun in "grep -i
444 '\(\(\)*.\)*\(\)\(\)\1'"
445 [24122] libc: Segfaults if 0 returned from la_version
446 [24153] stdio: Some input functions do not react to stdin assignment
447 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
448 RDX is set) (CVE-2019-7309)
449 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
450 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
451 not the default "nor"
452 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
453 false positives, change to modern flexible array
454 [24180] nptl: pthread_mutex_trylock does not use the correct order of
455 instructions while maintaining the robust mutex list due to missing
457 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
458 unnecessary librt dependencies
459 [24200] localedata: Revert first_weekday removal in en_IE locale
460 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
461 [24215] nptl: pthread_timedjoin_np should be a cancellation point
462 [24216] malloc: Check for large bin list corruption when inserting
464 [24228] stdio: old x86 applications that use legacy libio crash on exit
465 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
467 [24293] localedata: Missing Minguo calendar support for TW locales
468 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
470 [24307] localedata: Update locale data to Unicode 12.0.0
471 [24323] dynamic-link: dlopen should not be able open PIE objects
472 [24335] build: "Obsolete types detected" with Linux 5.0 headers
473 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
475 [24370] localedata: Add lang_name for tt_RU locale
476 [24372] locale: Binary locale files are not architecture independent
477 [24394] time: strptime %Ey mis-parses final year of era
478 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
480 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
482 [24531] malloc: Malloc tunables give tcache assertion failures
483 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
485 [24535] localedata: Update locale data to Unicode 12.1.0
486 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
487 kernels and break testing
488 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
489 [24556] build: [GCC 9] error: â%sâ directive argument is null
490 [-Werror=format-overflow=]
491 [24570] libc: alpha: compat msgctl uses __IPC_64
492 [24584] locale: Data race in __wcsmbs_clone_conv
493 [24588] stdio: Remove codecvt vtables from libio
494 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
496 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
497 [24632] stdio: Old binaries which use freopen with default stdio handles
499 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
501 [24652] localedata: szl_PL spelling correction
502 [24695] nss: nss_db: calling getpwent after endpwent crashes
503 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
504 in /etc/nsswitch.conf
505 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
506 [24740] libc: getdents64 type confusion
507 [24741] dynamic-link: ld.so should not require that a versioned symbol is
508 always implemented in the same library
509 [24744] libc: Remove copy_file_range emulation
510 [24757] malloc: memusagestat is linked against system libpthread
511 [24794] libc: Partial test suite run builds corrupt test-in-container
519 * The getcpu wrapper function has been added, which returns the currently
520 used CPU and NUMA node. This function is Linux-specific.
522 * A new convenience target has been added for distribution maintainers
523 to build and install all locales as directories with files. The new
524 target is run by issuing the following command in your build tree:
525 'make localedata/install-locale-files', with an optional DESTDIR
526 to set the install root if you wish to install into a non-default
529 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
531 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
532 for _GNU_SOURCE, to match BSD environments.
534 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
535 indicates that it will abort the transaction prior to entering the kernel
536 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
537 suspended, and this caused some undefined side-effects issues by aborting
538 transactions manually. Glibc avoided it by abort transactions manually on
539 each syscall, but it lead to performance issues on newer kernels where the
540 HTM state is saved and restore lazily (the state being saved even when the
541 process actually does not use HTM).
543 * The functions posix_spawn_file_actions_addchdir_np and
544 posix_spawn_file_actions_addfchdir_np have been added, enabling
545 posix_spawn and posix_spawnp to run the new process in a different
546 directory. These functions are GNU extensions. The function
547 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
550 * The popen and system do not run atfork handlers anymore (BZ#17490).
551 Although it is a possible POSIX violation, the POSIX rationale in
552 pthread_atfork documentation regarding atfork handlers is to handle
553 inconsistent mutex state after a fork call in a multi-threaded process.
554 In both popen and system there is no direct access to user-defined mutexes.
556 * Support for the C-SKY ABIV2 running on Linux has been added. This port
557 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
559 - C-SKY ABIV2 soft-float little-endian
560 - C-SKY ABIV2 hard-float little-endian
562 * strftime's default formatting of a locale's alternative year (%Ey)
563 has been changed to zero-pad the year to a minimum of two digits,
564 like "%y". This improves the display of Japanese era years during
565 the first nine years of a new era, and is expected to be harmless
566 for all other locales (only Japanese locales regularly have
567 alternative year numbers less than 10). Zero-padding can be
568 overridden with the '_' or '-' flags (which are GNU extensions).
570 * As a GNU extension, the '_' and '-' flags can now be applied to
571 "%EY" to control how the year number is formatted; they have the
572 same effect that they would on "%Ey".
574 Deprecated and removed features, and other changes affecting compatibility:
576 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
577 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
579 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
580 in <sys/procfs.h>, has been corrected to match the type actually used by
581 the Linux kernel. This affects the size and layout of that structure on
582 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
584 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
585 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
586 defined in <sys/procfs.h>, has been corrected to match the type actually
587 used by the Linux kernel. This affects the size and layout of those
590 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
591 meant to scan a string and allocate space for it with malloc, is now
592 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
593 defined. This extension conflicts with C99's use of '%a' to scan a
594 hexadecimal floating-point number, which is now available to programs
595 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
597 POSIX.1-2008 includes the feature of allocating a buffer for string input
598 with malloc, using the modifier letter 'm' instead. Programs using
599 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
600 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
601 C99 '%a' no longer need to avoid _GNU_SOURCE.
603 GCC's -Wformat warnings can detect most uses of this extension, as long
604 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
605 __attribute__ ((format (scanf, ...))).
607 Changes to build and runtime requirements:
609 * Python 3.4 or later is required to build the GNU C Library.
611 * On most architectures, GCC 5 or later is required to build the GNU C
612 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
614 Older GCC versions and non-GNU compilers are still supported when
615 compiling programs that use the GNU C Library.
617 Security related changes:
619 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
620 denial of service due to resource exhaustion when processing getaddrinfo
621 calls with crafted host names. Reported by Guido Vranken.
623 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
624 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
625 happened, accessing the 32-bit size_t value as the full 64-bit register
626 in the assembly string/memory functions would cause a buffer overflow.
629 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
630 addresses with arbitrary trailing characters, potentially leading to data
631 or command injection issues in applications.
633 The following bugs are resolved with this release:
635 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
636 [10496] localedata: 12h time representation in multiple locales faulty
637 [10797] localedata: it_IT locale numeric does not have a separator for
639 [11319] libc: dprintf doesn't handle errors properly
640 [16346] time: mktime: potentially unsafe use of localtime_offset
641 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
643 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
644 posix_spawn_file_actions_addfchdir_np
645 [17426] localedata: Indian locales: set the correct date format
646 [17490] stdio: popen should not invoke atfork handlers
647 [17783] libc: TIOCSER_TEMT conditions inconsistent
648 [18040] regex: use-after-free in regexec/get_subexp
649 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
650 [20018] network: getaddrinfo should reject IP addresses with trailing
651 characters (CVE-2016-10739)
652 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
653 [20271] libc: Missing "\n" in __libc_fatal calls
654 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
655 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
656 pointer argument is non-NULL
657 [21037] stdio: open_memstream and freopen
658 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
659 [21716] time: Crash in glibc's mktime in low-memory situations
660 [22834] stdio: Subprocess forked by popen may crash in Linux when
661 multithreads call popen
662 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
663 and pthread_create fails.
664 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
665 [23125] libc: riscv64: endless loop when throwing an exception from a
667 [23275] nptl: Race in pthread_mutex_lock while promoting to
668 PTHREAD_MUTEX_ELISION_NP.
669 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
671 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
673 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
675 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
676 [23509] dynamic-link: CET enabled glibc is incompatible with the older
678 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
679 [23521] nss: get_next_alias nss_files file stream leak
680 [23538] nptl: Hang in pthread_cond_broadcast
681 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
682 [23578] regex: Invalid memory access if regex pattern contains NUL byte
683 [23579] libc: Errors misreported in preadv2
684 [23597] build: support/test-container.c doesn't work with different
686 [23603] time: mktime signed integer overflow on large timestamps
687 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
688 [23614] libc: powerpc: missing CFI register information in __mpn_*
690 [23637] string: Generic strstr/strcasestr fails with huge needles
691 [23640] libc: no way to easily clear FD_CLOEXEC in
692 posix_spawn_file_actions_adddup2()
693 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
695 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
697 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
698 [23689] libc: Bug in documentation for rusage.ru_ixrss in
699 bits/types/struct_rusage.h
700 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
702 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
704 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
705 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
706 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
708 [23724] localedata: Albanian date formats are incorrect
709 [23735] math: libnldbl_nonshared.a references internal libm symbols
710 [23740] localedata: kl_GL: Month names and date formats need update
711 [23744] regex: regex refactorings to remove BE, avoid duplication
712 [23745] time: mktime fix for Gnulib + coreutils
713 [23758] time: Improve the width of alternate representation for year in
715 [23783] libc: [mips] Missing CMSPAR bits/termios.h
716 [23789] time: mktime does not set errno on failure
717 [23791] localedata: Wrong monetary format for ca_ES locale
718 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
719 [23794] locale: c16rtomb does not handle surrogate pairs
720 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
721 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
722 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
723 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
724 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
725 [23862] libc: [sh] missing kernel-features.h undefines
726 [23864] libc: [riscv] missing kernel-features.h undefines
727 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
728 [23907] malloc: Incorrect double-free malloc tcache check disregards
730 [23913] libc: off-by-one in function maybe_script_execute in
731 sysdeps/posix/spawni.c
732 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
733 [23923] locale: Add --no-hard-links option to localedef
734 [23927] network: Linux if_nametoindex() does not close descriptor
736 [23961] math: powf can overflow to inf without setting errno in non-
737 nearest rounding mode
738 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
739 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
740 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
741 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
742 [24011] localedata: Fixed small type in comment for locale bs_BA
743 [24018] libc: gettext() may return NULL
744 [24022] build: riscv build failure with Linux kernel 4.20-rc7
745 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
746 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
748 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
749 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
751 [24046] localedata: en_US locale doesn't define date_fmt
752 [24063] manual: @var{errno} should be @code{errno}
753 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
754 [24088] libc: VSCR field is not being correctly read in ucontext_t on
756 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
758 [24097] string: Can't use 64-bit register for size_t in assembly codes for
760 [24110] hurd: SS_DISABLE never set in stack_t value returned by
762 [24112] network: Do not send DNS queries for non-host names (where all
763 answers will be rejected)
764 [24130] libc: alpha __remqu corrupts $f3 register
771 * The localization data for ISO 14651 is updated to match the 2016
772 Edition 4 release of the standard, this matches data provided by
773 Unicode 9.0.0. This update introduces significant improvements to the
774 collation of Unicode characters. This release deviates slightly from
775 the standard in that the collation element ordering for lowercase and
776 uppercase LATIN script characters is adjusted to ensure that regular
777 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
778 is not matched by [a-z]. With the update many locales have been
779 updated to take advantage of the new collation information. The new
780 collation information has increased the size of the compiled locale
781 archive or binary locales.
783 * The GNU C Library can now be compiled with support for Intel CET, AKA
784 Intel Control-flow Enforcement Technology. When the library is built
785 with --enable-cet, the resulting glibc is protected with indirect
786 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
787 compatible with all existing executables and shared libraries. This
788 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
789 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
790 capable of multi-byte NOPs, like x86-64 processors as well as Intel
791 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
792 x86_64 and x32 on non-CET processors. --enable-cet has been tested
793 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
796 * The GNU C Library now has correct support for ABSOLUTE symbols
797 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
798 relocated incorrectly or in some cases discarded. The GNU linker can
799 make use of the newer semantics, but it must communicate it to the
800 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
801 field) to indicate such support is required.
803 * Unicode 11.0.0 Support: Character encoding, character type info, and
804 transliteration tables are all updated to Unicode 11.0.0, using
805 generator scripts contributed by Mike FABIAN (Red Hat).
807 * <math.h> functions that round their results to a narrower type are added
808 from TS 18661-1:2014 and TS 18661-3:2015:
810 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
813 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
816 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
819 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
822 * Two grammatical forms of month names are now supported for the following
823 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
824 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
825 support two grammatical forms in abbreviated month names: Catalan, Greek,
828 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
829 include the support for two grammatical forms of month names.
831 * Building and running on GNU/Hurd systems now works without out-of-tree
834 * The renameat2 function has been added, a variant of the renameat function
835 which has a flags argument. If the flags are zero, the renameat2 function
836 acts like renameat. If the flag is not zero and there is no kernel
837 support for renameat2, the function will fail with an errno value of
838 EINVAL. This is different from the existing gnulib function renameatu,
839 which performs a plain rename operation in case of a RENAME_NOREPLACE
840 flags and a non-existing destination (and therefore has a race condition
841 that can clobber the destination inadvertently).
843 * The statx function has been added, a variant of the fstatat64
844 function with an additional flags argument. If there is no direct
845 kernel support for statx, glibc provides basic stat support based on
846 the fstatat64 function.
848 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
849 library if installed. libidn2 version 2.0.5 or later is recommended. If
850 libidn2 is not available, internationalized domain names are not encoded
851 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
852 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
853 with an encoding error.) Flags which used to change the IDN encoding and
854 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
855 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
856 deprecated. They no longer have any effect.
858 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
859 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
860 range of ELF gABI expressions including such constructs as
861 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
862 have been further restricted, and where in the past a dynamic string
863 token sequence may have been interpreted as a literal string it will
864 now cause a load failure. These load failures were always considered
865 unspecified behaviour from the perspective of the dynamic loader, and
866 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
867 results in a load failure now.
869 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
870 implementation includes all the standard functions provided by
873 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
874 thrd_detach, thrd_exit, and thrd_join for thread management.
876 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
877 mtx_destroy for mutual exclusion.
879 - call_once for function call synchronization.
881 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
882 cnd_wait for conditional variables.
884 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
886 Application developers must link against libpthread to use ISO C threads.
888 Deprecated and removed features, and other changes affecting compatibility:
890 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
891 installed. Software that was using either header should be updated to
892 use standard <stdio.h> interfaces instead.
894 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
895 This was never required by the C standard, and the macros just expanded
896 to call alternative names for the same functions. If you hoped getc and
897 putc would provide performance improvements over fgetc and fputc, instead
898 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
899 necessary, flockfile and funlockfile.
901 * All stdio functions now treat end-of-file as a sticky condition. If you
902 read from a file until EOF, and then the file is enlarged by another
903 process, you must call clearerr or another function with the same effect
904 (e.g. fseek, rewind) before you can read the additional data. This
905 corrects a longstanding C99 conformance bug. It is most likely to affect
906 programs that use stdio to read interactive input from a terminal.
909 * The macros 'major', 'minor', and 'makedev' are now only available from
910 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
911 headers that happen to include <sys/types.h>. These macros are rarely
912 used, not part of POSIX nor XSI, and their names frequently collide with
913 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
916 <sys/sysmacros.h> is a GNU extension. Portable programs that require
917 these macros should first include <sys/types.h>, and then include
918 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
920 * The tilegx*-*-linux-gnu configurations are no longer supported.
922 * The obsolete function ustat is no longer available to newly linked
923 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
924 function has been deprecated in favor of fstatfs and statfs.
926 * The obsolete function nfsservctl is no longer available to newly linked
927 binaries. This function was specific to systems using the Linux kernel
928 and could not usefully be used with the GNU C Library on systems with
929 version 3.1 or later of the Linux kernel.
931 * The obsolete function name llseek is no longer available to newly linked
932 binaries. This function was specific to systems using the Linux kernel
933 and was not declared in a header. Programs should use the lseek64 name
934 for this function instead.
936 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
937 getaddrinfo and getnameinfo functions have been deprecated. The behavior
938 previously selected by them is now always enabled.
940 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
941 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
942 restriction (rejecting '_' in host names, among other things) has been
943 removed, for increased compatibility with non-IDN name resolution.
945 * The fcntl function now have a Long File Support variant named fcntl64. It
946 is added to fix some Linux Open File Description (OFD) locks usage on non
947 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
948 fcntl and LFS support is handled transparently. Also for Linux, the OFD
949 locks act as a cancellation entrypoint.
951 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
952 ecb_crypt, and des_setparity are no longer available to newly linked
953 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
954 longer installed. These functions encrypted and decrypted data with the
955 DES block cipher, which is no longer considered secure. Software that
956 still uses these functions should switch to a modern cryptography library,
959 * Reflecting the removal of the encrypt and setkey functions above, the
960 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
961 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
964 * The obsolete function fcrypt is no longer available to newly linked
965 binaries. It was just another name for the standard function crypt,
966 and it has not appeared in any header file in many years.
968 * We have tentative plans to hand off maintenance of the passphrase-hashing
969 library, libcrypt, to a separate development project that will, we hope,
970 keep up better with new passphrase-hashing algorithms. We will continue
971 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
972 'crypt_r' should not need to change at all; however, distributions will
973 need to install <crypt.h> and libcrypt from a separate project.
975 In this release, if the configure option --disable-crypt is used, glibc
976 will not install <crypt.h> or libcrypt, making room for the separate
977 project's versions of these files. The plan is to make this the default
978 behavior in a future release.
980 Changes to build and runtime requirements:
982 GNU make 4.0 or later is now required to build glibc.
984 Security related changes:
986 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
987 been fixed by removing the glibc-internal IDNA implementation and using
988 the system-provided libidn2 library instead. Originally reported by Hanno
989 Böck and Christian Weisgerber.
991 CVE-2017-18269: An SSE2-based memmove implementation for the i386
992 architecture could corrupt memory. Reported by Max Horn.
994 CVE-2018-11236: Very long pathname arguments to realpath function could
995 result in an integer overflow and buffer overflow. Reported by Alexey
998 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
999 architecture could write beyond the target buffer, resulting in a buffer
1000 overflow. Reported by Andreas Schwab.
1002 The following bugs are resolved with this release:
1004 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1005 [6889] manual: 'PWD' mentioned but not specified
1006 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1007 when __WORDSIZE != 64
1008 [13762] regex: re_search etc. should return -2 on memory exhaustion
1009 [13888] build: /tmp usage during testing
1010 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1011 [14092] nptl: Support C11 threads
1012 [14095] localedata: Review / update collation data from Unicode / ISO
1014 [14508] libc: -Wformat warnings
1015 [14553] libc: Namespace pollution loff_t in sys/types.h
1016 [14890] libc: Make NT_PRFPREG canonical.
1017 [15105] libc: Extra PLT references with -Os
1018 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1020 [16335] manual: Feature test macro documentation incomplete and out of
1022 [16552] libc: Unify umount implementations in terms of umount2
1023 [17082] libc: htons et al.: statement-expressions prevent use on global
1024 scope with -O1 and higher
1025 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1026 [17438] localedata: pt_BR: wrong d_fmt delimiter
1027 [17662] libc: please implement binding for the new renameat2 syscall
1028 [17721] libc: __restrict defined as /* Ignore */ even in c11
1029 [17979] libc: inconsistency between uchar.h and stdint.h
1030 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1031 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1032 horrible machine code)
1033 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1035 [18471] libc: llseek should be a compat symbol
1036 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1038 [18991] nss: nss_files skips large entry in database
1039 [19239] libc: Including stdlib.h ends up with macros major and minor being
1041 [19463] libc: linknamespace failures when compiled with -Os
1042 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1043 [19527] locale: Normalized charset name not recognized by setlocale
1044 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1045 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1047 [19728] network: out of bounds stack read in libidn function
1048 idna_to_ascii_4i (CVE-2016-6261)
1049 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1050 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1051 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1053 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1054 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1055 [20419] dynamic-link: files with large allocated notes crash in
1057 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1058 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1059 [20980] manual: CFLAGS environment variable replaces vital options
1060 [21163] regex: Assertion failure in pop_fail_stack when executing a
1061 malformed regexp (CVE-2015-8985)
1062 [21234] manual: use of CFLAGS makes glibc detect no optimization
1063 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1064 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1065 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1066 [21508] locale: intl/tst-gettext failure with latest msgfmt
1067 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1068 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1069 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1071 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1073 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1074 [22247] network: Integer overflow in the decode_digit function in
1075 puny_decode.c in libidn (CVE-2017-14062)
1076 [22342] nscd: NSCD not properly caching netgroup
1077 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1078 [22550] localedata: es_ES locale (and other es_* locales): collation
1079 should treat ñ as a primary different character, sync the collation
1080 for Spanish with CLDR
1081 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1082 by gcc configured with --enable-default-pie
1083 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1084 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1085 crossing 2GB threshold (CVE-2017-18269)
1086 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1088 [22735] time: Misleading typo in time.h source comment regarding
1090 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1091 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1092 `__assert_perror_fail ()' to `__assert_fail_base ()'
1093 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1095 [22786] libc: Stack buffer overflow in realpath() if input size is close
1096 to SSIZE_MAX (CVE-2018-11236)
1097 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1098 through an absolute DT_NEEDED path
1099 [22792] build: tcb-offsets.h dependency dropped
1100 [22797] libc: pkey_get() uses non-reserved name of argument
1101 [22807] libc: PTRACE_* constants missing for powerpc
1102 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1103 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1104 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1105 [22848] localedata: ca_ES: update date definitions from CLDR
1106 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1107 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1108 [22896] localedata: Update locale data for an_ES
1109 [22902] math: float128 test failures with GCC 8
1110 [22918] libc: multiple common of `__nss_shadow_database'
1111 [22919] libc: sparc32: backtrace yields infinite backtrace with
1113 [22926] libc: FTBFS on powerpcspe
1114 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1116 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1117 [22947] libc: FAIL: misc/tst-preadvwritev2
1118 [22963] localedata: cs_CZ: Add alternative month names
1119 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1120 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1121 [22998] dynamic-link: execstack tests are disabled when SELinux is
1123 [23005] network: Crash in __res_context_send after memory allocation
1125 [23007] math: strtod cannot handle -nan
1126 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1127 [23036] regex: regex equivalence class regression
1128 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1129 [23069] libc: sigaction broken on riscv64-linux-gnu
1130 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1131 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1132 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1133 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1134 and libc build with -Os)
1135 [23140] localedata: More languages need two forms of month names
1136 [23145] libc: _init/_fini aren't marked as hidden
1137 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1138 [23171] math: C++ iseqsig for long double converts arguments to double
1139 [23178] nscd: sudo will fail when it is run in concurrent with commands
1140 that changes /etc/passwd
1141 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1143 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1144 [23208] localedata: New locale - Lower Sorbian (dsb)
1145 [23233] regex: Memory leak in build_charclass_op function in file
1147 [23236] stdio: Harden function pointers in _IO_str_fields
1148 [23250] nptl: Offset of __private_ss differs from GCC
1149 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1150 -mtune=generic -mfpmath=sse
1151 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1153 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1154 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1156 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1157 [23277] math: nan function should not have const attribute
1158 [23279] math: scanf and strtod wrong for some hex floating-point
1159 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1161 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1162 [23303] build: undefined reference to symbol
1163 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1164 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1166 [23313] stdio: libio vtables validation and standard file object
1168 [23329] libc: The __libc_freeres infrastructure is not properly run across
1170 [23349] libc: Various glibc headers no longer compatible with
1172 [23351] malloc: Remove unused code related to heap dumps and malloc
1174 [23363] stdio: stdio-common/tst-printf.c has non-free license
1175 [23396] regex: Regex equivalence regression in single-byte locales
1176 [23422] localedata: oc_FR: More updates of locale data
1177 [23442] build: New warning with GCC 8
1178 [23448] libc: Out of bounds access in IBM-1390 converter
1179 [23456] libc: Wrong index_cpu_LZCNT
1180 [23458] build: tst-get-cpu-features-static isn't added to tests
1181 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1183 [23467] dynamic-link: x86/CET: A property note parser bug
1190 * The GNU C Library can now be compiled with support for building static
1191 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1192 executables are like static executables but can be loaded at any address
1193 and provide additional security hardening benefits at the cost of some
1194 memory and performance. When the library is built with --enable-static-pie
1195 the resulting libc.a is usable with GCC 8 and above to create static PIE
1196 executables using the GCC option '-static-pie'. This feature is currently
1197 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1198 aarch64 with binutils 2.30 or later.
1200 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1201 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1204 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1206 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1208 * In order to support faster and safer process termination the malloc API
1209 family of functions will no longer print a failure address and stack
1210 backtrace after detecting heap corruption. The goal is to minimize the
1211 amount of work done after corruption is detected and to avoid potential
1212 security issues in continued process execution. Reducing shutdown time
1213 leads to lower overall process restart latency, so there is benefit both
1214 from a security and performance perspective.
1216 * The abort function terminates the process immediately, without flushing
1217 stdio streams. Previous glibc versions used to flush streams, resulting
1218 in deadlocks and further data corruption. This change also affects
1219 process aborts as the result of assertion failures.
1221 * On platforms where long double has the IEEE binary128 format (aarch64,
1222 alpha, mips64, riscv, s390 and sparc), the math library now implements
1223 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1224 These are the same interfaces added in version 2.26 for some platforms where
1225 this format is supported but is not the format of long double.
1227 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1228 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1229 implements interfaces for that type, as defined by ISO/IEC TS
1230 18661-3:2015. These are corresponding interfaces to those supported for
1233 * The math library now implements interfaces for the _Float32, _Float64 and
1234 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1235 corresponding interfaces to those supported for _Float128.
1237 * glibc now implements the memfd_create and mlock2 functions on Linux.
1239 * Support for memory protection keys was added. The <sys/mman.h> header now
1240 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1243 * The copy_file_range function was added.
1245 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1247 * The ldconfig utility now processes `include' directives using the C/POSIX
1248 collation ordering. Previous glibc versions used locale-specific
1249 ordering, the change might break systems that relied on that.
1251 * Support for two grammatical forms of month names has been added.
1252 In a call to strftime, the "%B" and "%b" format specifiers will now
1253 produce the grammatical form required when the month is used as part
1254 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1255 required when the month is named by itself. For instance, in Greek
1256 and in many Slavic and Baltic languages, "%B" will produce the month
1257 in genitive case, and "%OB" will produce the month in nominative case.
1259 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1260 are all valid and will all accept any known form of month
1261 name---standalone or complete, abbreviated or full. In a call to
1262 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1263 the strings used by "%B" and "%b", respectively. New query
1264 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1265 used by "%OB" and "%Ob", respectively.
1267 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1268 define the strings for %OB and %Ob, respectively; these have the
1269 same syntax as "mon" and "abmon". These arrays are optional; if they
1270 are not provided then they have the same content as "mon" and "abmon",
1273 These features are provided for locales which define "alt_mon" and/or
1274 "ab_alt_mon" in their locale source data. This release includes such
1275 alternative month name data for the following languages: Belarusian,
1276 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1278 This feature is currently a GNU extension, but it is expected to
1279 be added to the next revision of POSIX, and it is also already
1280 available on some BSD-derived operating systems.
1282 This feature will cause existing statically compiled applications
1283 to fail to load locales and fall back to the builtin C/POSIX locales.
1284 See notes below for other changes affecting compatibility.
1286 * Support for the RISC-V ISA running on Linux has been added. This port
1287 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1288 for the following ISA and ABI pairs:
1294 Deprecated and removed features, and other changes affecting compatibility:
1296 * Statically compiled applications attempting to load locales compiled for the
1297 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1298 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1299 support for two grammatical forms of the month names, also extends the locale
1300 data binary format. Static applications needing locale support must be
1301 recompiled to match the runtime and data they are deployed with. In some
1302 distributions there is an upgrade window where dynamically linked applications
1303 may use a new library but the old locale data and also fall back to the
1304 builtin C/POSIX locales; restarting the application process is sufficient to
1307 * Support for statically linked applications which call dlopen is deprecated
1308 and will be removed in a future version of glibc. Applications which call
1309 dlopen need to be linked dynamically instead.
1311 * Support for old programs which use internal stdio data structures and
1312 functions is deprecated. This includes programs which use the C++ streams
1313 provided by libstdc++ in GCC 2.95. Programs which use the internal
1314 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1315 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1316 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1317 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1318 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1319 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1320 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1321 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1322 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1323 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1324 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1325 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1326 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1327 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1328 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1329 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1330 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1331 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1332 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1333 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1334 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1335 future version of glibc. Unlike other symbol removals, these old
1336 applications will not be supported using compatibility symbols.
1338 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1339 defined by <sys/ptrace.h>.
1341 * libm no longer supports SVID error handling (calling a user-provided
1342 matherr function on error) or the _LIB_VERSION variable to control error
1343 handling. (SVID error handling and the _LIB_VERSION variable still work
1344 for binaries linked against older versions of the GNU C Library.) The
1345 libieee.a library is no longer provided. math.h no longer defines struct
1346 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1347 TLOSS, PLOSS and HUGE.
1349 * The libm functions pow10, pow10f and pow10l are no longer supported for
1350 new programs. Programs should use the standard names exp10, exp10f and
1351 exp10l for these functions instead.
1353 * The mcontext_t type is no longer the same as struct sigcontext. On
1354 platforms where it was previously the same, this changes the C++ name
1355 mangling for interfaces involving this type.
1357 * The add-ons mechanism for building additional packages at the same time as
1358 glibc has been removed. The --enable-add-ons configure option is now
1361 * The --without-fp configure option is now ignored. Whether hardware
1362 floating-point instructions are used is now configured based on whether
1363 the compiler used at configure time (without any options implied by a
1364 --with-cpu= configure option) uses such instructions.
1366 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1367 the specified string can be parsed as a domain name.
1369 * In the malloc_info output, the <heap> element may contain another <aspace>
1370 element, "subheaps", which contains the number of sub-heaps.
1372 * The libresolv function p_secstodate is no longer supported for new
1375 * The tilepro-*-linux-gnu configuration is no longer supported.
1377 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1378 and will be removed in a future release. Software that is still using
1379 either header should be updated to use standard <stdio.h> interfaces
1382 libio.h was originally the header for a set of supported GNU extensions,
1383 but they have not been maintained as such in many years, they are now
1384 standing in the way of improvements to stdio, and we don't think there are
1385 any remaining external users. _G_config.h was never intended for public
1386 use, but predates the bits convention.
1388 Changes to build and runtime requirements:
1390 * bison version 2.7 or later is required to generate code in the 'intl'
1393 Security related changes:
1395 CVE-2009-5064: The ldd script would sometimes run the program under
1396 examination directly, without preventing code execution through the
1397 dynamic linker. (The glibc project disputes that this is a security
1398 vulnerability; only trusted binaries must be examined using the ldd
1401 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1402 suffered from a one-byte overflow during ~ operator processing (either
1403 on the stack or the heap, depending on the length of the user name).
1404 Reported by Tim RĂŒhsen.
1406 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1407 would sometimes fail to free memory allocated during ~ operator
1408 processing, leading to a memory leak and, potentially, to a denial
1411 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1412 without GLOB_NOESCAPE, could write past the end of a buffer while
1413 unescaping user names. Reported by Tim RĂŒhsen.
1415 CVE-2017-17426: The malloc function, when called with an object size near
1416 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1417 instead of NULL. This was a regression introduced with the new malloc
1418 thread cache in glibc 2.26. Reported by Iain Buclaw.
1420 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1421 to the allocation of too much memory. (This is not a security bug per se,
1422 it is mentioned here only because of the CVE assignment.) Reported by
1425 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1426 of the number of search path components. (This is not a security
1427 vulnerability per se because no trust boundary is crossed if the fix for
1428 CVE-2017-1000366 has been applied, but it is mentioned here only because
1429 of the CVE assignment.) Reported by Qualys.
1431 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1432 for AT_SECURE or SUID binaries could be used to load libraries from the
1435 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1436 succeeds without returning an absolute path due to unexpected behaviour
1437 of the Linux kernel getcwd syscall. Reported by halfdog.
1439 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1440 an object size near the value of SIZE_MAX, would return a pointer to a
1441 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1443 CVE-2018-6551: The malloc function, when called with an object size near
1444 the value of SIZE_MAX, would return a pointer to a buffer which is too
1445 small, instead of NULL.
1447 The following bugs are resolved with this release:
1449 [866] glob: glob should match dangling symlinks
1450 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1451 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1453 [5997] math: Very slow execution of sinf function
1454 [10580] localedata: hr_HR: updated locale
1455 [10871] locale: 'mon' array should contain both nominative and genitive
1457 [12349] localedata: eu_ES: incorrect thousands separator
1458 [13605] localedata: shn_MM: new Shan locale
1459 [13805] localedata: ru_RU: currency should use ',' as radix point
1460 [13953] localedata: km_KH: locale update
1461 [13994] localedata: mjw_IN: new locale
1462 [14121] build: make writes .mo files in po directory
1463 [14333] libc: Fix the race between atexit() and exit()
1464 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1465 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1467 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1468 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1469 width Latin characters
1470 [15332] localedata: es_CU: locale update
1471 [15436] stdio: Don't close or flush stdio streams on abort
1472 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1474 [16148] localedata: ca_ES: incorrect thousands separator
1475 [16750] dynamic-link: ldd should not try to execute the binaries
1477 [16777] localedata: pl_PL: incorrect thousands separator in locale
1478 [16905] localedata: hanzi: new collation
1479 [17563] localedata: cmn_TW: add hanzi collation
1480 [17750] localedata: wrong collation order of diacritics in most locales
1481 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1483 [17956] build: Build fails on missing definitions from header file
1484 nss/nss.h when Mozilla NSS is used for cryptography
1485 [18203] libc: realpath() does not handle unreachable paths correctly
1486 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1487 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1488 [18822] libc: Internal functions are called via PLT
1489 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1490 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1491 [19574] libc: glibc should support building static PIE binaries
1492 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1494 [19971] glob: glob: Do not skip entries with zero d_ino values
1495 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1496 [20008] localedata: km_KH: convert to translit_neutral
1497 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1498 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1499 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1500 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1501 [20498] localedata: miq_NI: new MĂskitu / Miskito (miq) language locale
1503 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1504 they're set, wrong errors returned by gaih_inet when lookup functions
1506 [20756] localedata: [PATCH] Use Unicode wise thousands separator
1507 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1509 [20952] localedata: yuw_PG: new locale
1510 [21084] localedata: charmaps/IBM858: new codepage
1511 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1512 [21242] libc: assert gives pedantic warning in old gcc versions
1513 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1514 __regcall calling convention
1515 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1516 [21326] libc: C99 functions are not declared for C++11 and later if
1517 _GNU_SOURCE is not predefined by g++
1518 [21457] libc: sys/ucontext.h namespace
1519 [21530] libc: tmpfile() should be implemented using O_TMPFILE
1520 [21660] math: GCC fails to compile a formula with tgmath.h
1521 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1522 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1523 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1524 [21684] math: tgmath.h handling of complex integers
1525 [21685] math: tgmath.h handling of bit-fields
1526 [21686] math: tgmath.h handling of __int128
1527 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1529 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1531 [21750] localedata: column width of characters incompatible with classical
1533 [21754] malloc: malloc: Perform as little work as possible after heap
1534 consistency check failures
1535 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1536 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1537 [21791] string: Unused XXX_chk_XXX functions in libc.a
1538 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1540 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1542 [21845] localedata: Added new Locale bho_NP
1543 [21853] localedata: Fix abday Which looks same as day in zh_SG
1544 [21854] localedata: Added New Locale en_SC
1545 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1546 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1547 _dl_runtime_resolve_avx_slow
1548 [21885] network: getaddrinfo: gethosts does not release resolver context
1549 on memory allocation failure
1550 [21899] libc: XPG4.2 sigaction namespace
1551 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1553 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1555 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1556 errno value, causing getaddrinfo to fail
1557 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1558 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1559 instead of EAI_NODATA
1560 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1561 constant PTRACE_SEIZE_DEVEL
1562 [21930] math: C-only gcc builtins used in <math.h> isinf
1563 [21932] network: Unpaired __resolv_context_get in generic get*_r
1565 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1566 [21944] libc: sigval namespace
1567 [21951] localedata: Update hanzi collation by stroke
1568 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
1569 sysdeps/x86_64/fpu/e_expf.S
1570 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1571 allocation in syscall loops)
1572 [21959] localedata: Fix Country name for xh_ZA
1573 [21960] localedata: Fix abmon for bem_ZM
1574 [21966] math: AVX2 mathvec functions use FMA without checking
1575 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1576 [21971] localedata: Added New Locale for mfe_MU
1577 [21972] libc: assert macro requires operator== (int) for its argument type
1578 [21973] math: [sparc] libm missing sqrtl compat symbol
1579 [21974] libc: Remove __bb_init_func and __bb_exit_func
1580 [21982] string: stratcliff.c: error: assuming signed overflow does not
1582 [21986] stdio: __guess_grouping is called incorrectly
1583 [21987] math: [sparc32] wrong bits/long-double.h installed
1584 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1586 [22022] localedata: Missing country_name for mni_IN
1587 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1589 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1591 [22026] locale: iconv_open: heap overflow on gconv_init failure
1592 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1593 [22035] math: [m68k] bits/math-inline.h macro namespace
1594 [22038] localedata: Fix abbreviated weeks and months for Somali
1595 [22044] localedata: Remove redundant data for Limburgish Language
1596 [22050] malloc: Linking with -lmcheck does not hook
1597 __malloc_initialize_hook correctly
1598 [22051] libc: zero terminator in the middle of glibc's .eh_frame
1599 [22052] malloc: malloc failed to compile with GCC 7 and -O3
1600 [22070] localedata: charmaps/UTF-8: wcwidth for
1601 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1602 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1603 Jungseong and Jongseong) should be 0
1604 [22078] nss: nss_files performance issue in multi mode
1605 [22082] math: bits/math-finite.h exp10 condition
1606 [22086] libc: pcprofiledump incorrect cross-endian condition
1607 [22093] dynamic-link: ld.so no longer searches in .../x86_64
1608 [22095] network: Name server address allocation memory leak in resolv.conf
1610 [22096] network: __resolv_conf_attach can incorrectly free passed conf
1612 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1613 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1615 [22111] malloc: malloc: per thread cache is not returned when thread exits
1616 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1617 [22134] libc: [linux] implement fexecve with execveat
1618 [22142] libc: [powerpc] printf oupts a wrong value of DBL_MAX on ppc64 and
1620 [22145] libc: ttyname() gives up too early in the face of namespaces
1621 [22146] math: C++ build issue with float128 on x86_64
1622 [22153] nptl: nptl: save error code before process termination
1623 [22156] libc: [hppa,ia64,microblaze] Executable stack default
1624 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1625 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1626 [22165] libc: [hppa] Text relocations in libc.so
1627 [22180] libc: destructor registered via __cxa_atexit is called twice
1628 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1629 symlinks") cause "make" segfaults
1630 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1632 [22207] libc: FAIL: stdlib/test-atexit-race
1633 [22225] math: nearbyint arithmetic moved before feholdexcept
1634 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1635 [22235] math: iscanonical in C++ and float128
1636 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1637 the svid compat wrapper
1638 [22244] math: ynf and yn are wrong without the svid compat wrapper
1639 [22273] libc: Improper assert in Linux posix_spawn implementation
1640 [22284] libc: -pg -pie doesn't work
1641 [22292] locale: localedef exits with error 4 when it should be error 1
1642 [22294] locale: Allow "" for int_currency_symbol definition in locales.
1643 [22295] locale: Don't warn on non-symbolic characters in locale sources in
1645 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1646 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1648 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1649 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1650 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1651 [22322] libc: [mips64] wrong bits/long-double.h installed
1652 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1653 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1655 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1656 [22343] malloc: Integer overflow in posix_memalign
1657 [22347] libc: getrandom() returns the number of bytes that were copied to
1658 the buffer even though the comments say "Return 0 on success and -1 on
1660 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1661 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1663 [22370] dynamic-link: Incorrect note padding check
1664 [22375] libc: malloc returns pointer from tcache_get when should return
1665 NULL (CVE-2017-17426)
1666 [22377] math: iseqsig, float128 and C++
1667 [22382] localedata: Error in tpi_PG locale
1668 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1669 inside the ASCII printable range
1670 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1672 [22403] localedata: Slash needs escaping in some locales
1673 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1674 [22409] network: res_hnok does not accept some host names used on the
1676 [22412] network: res_dnok, res_hnok should perform syntax checks
1677 [22413] network: ns_name_pton ignores syntactically invalid trailing
1679 [22415] stdio: setvbuf can lead to invalid free/segfault
1680 [22432] build: Non-deterministic build
1681 [22439] malloc: malloc_info should compute summary statistics for all sub-
1683 [22442] network: if_nametoindex could report index for the wrong
1684 networking interface
1685 [22446] build: aliasing violation calling readlink in handle_request
1686 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
1687 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
1688 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
1689 __nscd_hash/__nss_hash
1690 [22463] network: p_secstodate overflow handling
1691 [22469] localedata: pl_PL LC_COLLATE does not use i18n
1692 [22478] libc: sigwait can fail with EINTR
1693 [22505] libc: ldconfig processes include directive in locale-specific
1695 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
1696 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
1697 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
1698 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
1699 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
1700 [22534] localedata: Collation rules for Serbian and Bosnian should be the
1701 same as for Croatian
1702 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
1703 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
1704 [22577] libc: missing newline after "cannot allocate TLS data structures
1706 [22588] manual: manual/conf.texi: missing underscore in front of
1708 [22593] math: nextafter and nexttoward are declared with const attribute
1709 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
1710 [22603] string: ia64 memchr overflows internal pointer check
1711 [22605] libc: SH clone does not set the exit code correctly
1712 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
1714 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
1715 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
1716 modified in case of success
1717 [22614] build: gcc: error: unrecognized command line option â-no-pieâ
1718 [22615] manual: manual: ambiguous wording about errno value in case of
1720 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
1722 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
1723 binaries or if /proc is not mounted (CVE-2017-16997)
1724 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
1725 [22630] build: $(no-pie-ldflag) is no longer effective
1726 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
1727 [22635] nptl: pthread_self returns NULL before libpthread is loaded
1728 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
1729 [22637] nptl: guard size is subtracted from thread stack size instead of
1731 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
1732 [22657] localedata: hu_HU: Avoid double space in date
1733 [22660] math: fmax, fmin sNaN handling on alpha
1734 [22664] libc: New warning of GCC8
1735 [22665] math: alpha: ceil and floor raise inexact exceptions
1736 [22666] math: alpha: trunc raise inexact exceptions
1737 [22667] libc: makecontext lacks stack alignment on i386
1738 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
1739 [22679] libc: getcwd(3) can succeed without returning an absolute path
1741 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
1742 elision and tunables
1743 [22687] math: [powerpc-nofpu] complex long double functions spurious
1745 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
1746 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
1747 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
1749 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
1750 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
1752 [22701] nis: Incomplete removal of libnsl
1753 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
1754 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
1755 [22715] dynamic-link: FAIL: elf/tst-audit10
1756 [22719] libc: Backtrace tests fail on hppa
1757 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
1758 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
1759 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
1760 before the first call to crypt_r () in crypt/badsalttest.c
1767 * A per-thread cache has been added to malloc. Access to the cache requires
1768 no locks and therefore significantly accelerates the fast path to allocate
1769 and free small amounts of memory. Refilling an empty cache requires locking
1770 the underlying arena. Performance measurements show significant gains in a
1771 wide variety of user workloads. Workloads were captured using a special
1772 instrumented malloc and analyzed with a malloc simulator. Contributed by
1773 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
1775 * Unicode 10.0.0 Support: Character encoding, character type info, and
1776 transliteration tables are all updated to Unicode 10.0.0, using
1777 generator scripts contributed by Mike FABIAN (Red Hat).
1778 These updates cause user visible changes, especially the changes in
1779 wcwidth for many emoji characters cause problems when emoji sequences
1780 are rendered with pango, see for example:
1781 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
1783 * Collation of Hungarian has been overhauled and is now consistent with "The
1784 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
1787 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
1789 - The GNU C Library will now detect when /etc/resolv.conf has been
1790 modified and reload the changed configuration. The new resolver option
1791 âno-reloadâ (RES_NORELOAD) disables this behavior.
1793 - The GNU C Library now supports an arbitrary number of search domains
1794 (configured using the âsearchâ directive in /etc/resolv.conf);
1795 previously, there was a hard limit of six domains. For backward
1796 compatibility, applications that directly modify the â_resâ global
1797 object are still limited to six search domains.
1799 - When the ârotateâ (RES_ROTATE) resolver option is active, the GNU C
1800 Library will now randomly pick a name server from the configuration as a
1801 starting point. (Previously, the second name server was always used.)
1803 * The tunables feature is now enabled by default. This allows users to tweak
1804 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
1806 * New function reallocarray, which resizes an allocated block (like realloc)
1807 to the product of two sizes, with a guaranteed clean failure upon integer
1808 overflow in the multiplication. Originally from OpenBSD, contributed by
1809 Dennis Wölfing and RĂŒdiger Sonderfeld.
1811 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
1812 These are extended versions of preadv and pwritev, respectively, taking an
1813 additional flags argument. The set of supported flags depends on the
1814 running kernel; full support currently requires kernel 4.7 or later.
1816 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
1817 create a new session ID for the spawned process. This feature is
1818 scheduled to be added to the next major revision of POSIX; for the time
1819 being, it is available under _GNU_SOURCE.
1821 * errno.h is now safe to use from C-preprocessed assembly language on all
1822 supported operating systems. In this context, it will only define the
1823 Exxxx constants, as preprocessor macros expanding to integer literals.
1825 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
1826 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
1827 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
1828 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
1830 To compile programs that use this feature, the compiler must support
1831 128-bit floating point with the type name _Float128 (as defined by TS
1832 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
1833 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
1834 must be defined to make the new interfaces visible.
1836 The new functions and macros correspond to those present for other
1837 floating-point types (except for a few obsolescent interfaces not
1838 supported for the new type), with F128 or f128 suffixes; for example,
1839 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
1840 printf or scanf formats for the new type; the strfromf128 and strtof128
1841 interfaces should be used instead.
1843 Deprecated and removed features, and other changes affecting compatibility:
1845 * The synchronization that pthread_spin_unlock performs has been changed to
1846 now be equivalent to a C11 atomic store with release memory order to the
1847 spin lock's memory location. Previously, several (but not all)
1848 architectures used stronger synchronization (e.g., containing what is
1849 often called a full barrier). This change can improve performance, but
1850 may affect odd fringe uses of spin locks that depend on the previous
1851 behavior (e.g., using spin locks as atomic variables to try to implement
1852 Dekker's mutual exclusion algorithm).
1854 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
1857 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
1858 will only be built and installed when the GNU C Library is configured with
1859 --enable-obsolete-rpc. This allows alternative RPC implementations, such
1860 as TIRPC or rpcsvc-proto, to be used.
1862 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
1863 libnss_compat, are deprecated, and will not be built or installed by
1866 The NIS(+) support library, libnsl, is also deprecated. By default, a
1867 compatibility shared library will be built and installed, but not headers
1868 or development libraries. Only a few NIS-related programs require this
1869 library. (In particular, the GNU C Library has never required programs
1870 that use 'gethostbyname' to be linked with libnsl.)
1872 Replacement implementations based on TIRPC, which additionally support
1873 IPv6, are available from <https://github.com/thkukuk/>. The configure
1874 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
1875 name service modules, to be built and installed.
1877 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
1878 support is enabled, the configured recursive resolver must support EDNS.
1879 (Responding to EDNS-enabled queries with responses which are not
1880 EDNS-enabled is fine, but FORMERR responses are not.)
1882 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
1883 servers have not supported this opcode for a long time.
1885 * The _res_opcodes variable has been removed from libresolv. It had been
1886 exported by accident.
1888 * <string.h> no longer includes inline versions of any string functions,
1889 as this kind of optimization is better done by the compiler. The macros
1890 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
1892 * The nonstandard header <xlocale.h> has been removed. Most programs should
1893 use <locale.h> instead. If you have a specific need for the definition of
1894 locale_t with no other declarations, please contact
1895 libc-alpha@sourceware.org and explain.
1897 * The obsolete header <sys/ultrasound.h> has been removed.
1899 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
1901 * The obsolete function cfree has been removed. Applications should use
1904 * The stack_t type no longer has the name struct sigaltstack. This changes
1905 the C++ name mangling for interfaces involving this type.
1907 * The ucontext_t type no longer has the name struct ucontext. This changes
1908 the C++ name mangling for interfaces involving this type.
1910 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
1911 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
1912 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
1913 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
1914 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
1915 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
1916 fpregset_t type no longer has the name struct fpu. This changes the C++
1917 name mangling for interfaces involving those types.
1919 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
1920 synced with the kernel:
1922 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
1923 are not supported on this architecture and have been removed.
1925 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
1926 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
1927 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
1929 Programs that assume the GET/SETREGS ptrace requests are universally
1930 available will now fail to build, instead of malfunctioning at runtime.
1932 Changes to build and runtime requirements:
1934 * Linux kernel 3.2 or later is required at runtime, on all architectures
1935 supported by that kernel. (This is a change from version 2.25 only for
1938 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
1940 * On most architectures, GCC 4.9 or later is required to build the GNU C
1941 Library. On powerpc64le, GCC 6.2 or later is required.
1943 Older GCC versions and non-GNU compilers are still supported when
1944 compiling programs that use the GNU C Library. (We do not know exactly
1945 how old, and some GNU extensions to C may be _de facto_ required. If you
1946 are interested in helping us make this statement less vague, please
1947 contact libc-alpha@sourceware.org.)
1949 Security related changes:
1951 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
1952 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
1954 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
1955 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
1957 * Avoid printing a backtrace from the __stack_chk_fail function since it is
1958 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
1961 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
1962 fixed (CVE-2017-12133).
1964 The following bugs are resolved with this release:
1966 [984] network: Respond to changed resolv.conf in gethostbyname
1967 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
1968 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
1970 [12189] libc: __stack_chk_fail should not attempt a backtrace
1972 [14096] time: Race condition on timezone/tst-timezone.out
1973 [14172] localedata: az_IR: new locale
1974 [14995] build: glibc fails to build if gold is the default linker, even if
1976 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
1977 [16637] network: inet_pton function is accepting IPv6 with bad format
1978 [16640] string: string/strtok.c: undefined behaviour inconsistent between
1979 x86 and other generic code
1980 [16875] localedata: ko_KR: fix lang_name
1981 [17225] localedata: ar_SY: localized month names for May and June are
1983 [17297] localedata: da_DK: wrong date_fmt string
1984 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
1985 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
1986 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
1987 [19066] localedata: ar_SA abbreviated day and month names are in English
1988 [19569] network: resolv: Support an arbitrary number of search domains
1989 [19570] network: Implement random DNS server selection in the stub
1991 [19838] locale: localedef fails on PA-RISC
1992 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
1993 order of 0D36 and 0D37
1994 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
1996 [20098] libc: FAIL: debug/backtrace-tst on hppa
1997 [20257] network: sunrpc: clntudp_call does not enforce timeout when
1999 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2001 [20313] localedata: Update locale data to Unicode 9.0
2002 [20424] manual: Document how to provide a malloc replacement
2003 [20496] localedata: agr_PE: new language locale AwajĂșn / Aguaruna (agr)
2005 [20686] locale: Add el_GR@euro to SUPPORTED.
2006 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2007 failures consistently
2008 [21015] dynamic-link: Document and fix --enable-bind-now
2009 [21016] nptl: pthread_cond support is broken on hppa
2010 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2011 frame-pointer on i386
2012 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2014 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2015 [21088] libc: Build fails with --enable-static-nss
2016 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2017 generic c code is used
2018 [21109] libc: Tunables broken on big-endian
2019 [21112] math: powf has large ulp errors with base close to 1 and exponent
2021 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2023 [21120] malloc: glibc malloc is incompatible with GCC 7
2024 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2026 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2027 (-0.0) when linking with -lieee
2028 [21171] math: log10, log2 and lgamma return incorrect results
2029 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2030 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2031 [21207] localedata: ce_RU: update weekdays from CLDR
2032 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2033 [21217] localedata: Update months from CLDR-31
2034 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2035 [21243] libc: support_delete_temp_file should issue warning for failed
2037 [21244] libc: support resolv_test_start() socket fd close should be
2039 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2040 new posix_spawn implementation
2041 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2042 leads to lower CPU frequency
2043 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2044 [21261] libc: [sparc64] bits/setjmp.h namespace
2045 [21267] network: [mips] bits/socket.h IOC* namespace
2046 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2047 [21270] libc: mmap64 silently truncates large offset values
2048 [21275] libc: posix_spawn always crashes on ia64 now
2049 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2050 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2051 [21289] libc: Incorrect declaration for 32-bit platforms with
2052 _FILE_OFFSET_BITS=64 causes build error
2053 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2054 not support gethostbyname4_r
2055 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2057 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2059 [21340] libc: Support POSIX_SPAWN_SETSID
2060 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2061 [21359] network: ns_name_pack needs additional byte in destination buffer
2062 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2063 against fragmentation attacks (CVE-2017-12132)
2064 [21369] network: resolv: Remove EDNS fallback
2065 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2067 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2068 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2069 [21393] stdio: Missing dup3 error check in freopen, freopen64
2070 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2071 [21399] localedata: Bad description for U00EC in
2072 localedata/charmaps/CP1254
2073 [21411] malloc: realloc documentation error
2074 [21426] network: sys/socket.h uio.h namespace
2075 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2076 [21445] libc: signal.h bsd_signal namespace
2077 [21455] network: Network headers stdint.h namespace
2078 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2080 [21475] network: resolv: Overlong search path is truncated mid-label
2081 [21511] libc: sigstack namespace
2082 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2083 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2084 bits/syscall.h: No such file or directory
2085 [21517] libc: struct sigaltstack namespace
2086 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2087 [21533] localedata: Update locale data to Unicode 10.0
2089 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2090 junk at end of line, first unrecognized character is `@'
2091 [21538] libc: SIG_HOLD missing for XPG4
2092 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2093 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2094 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2095 [21543] libc: sigevent namespace
2096 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2097 size for general purpose registers in mcontext_t structure
2098 [21550] libc: sigwait namespace
2099 [21552] libc: XPG4 bsd_signal namespace
2100 [21554] libc: sigpause namespace
2101 [21560] libc: sys/wait.h signal.h namespace
2102 [21561] libc: waitid namespace
2103 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2104 '/usr/include/stdlib.h': Permission denied
2105 [21575] libc: sys/wait.h missing struct rusage definition
2106 [21584] libc: sigaltstack etc namespace
2107 [21597] libc: siginterrupt namespace
2108 [21607] math: hppa: FAIL: math/test-tgmath
2109 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2111 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2112 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2113 stack and heap (CVE-2017-1000366)
2114 [21625] libc: wait3 namespace
2115 [21654] nss: Incorrect pointer alignment in NSS group merge result
2117 [21657] network: Parse interface zone id for node-local multicast
2118 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2120 [21666] libc: .symver is used on common symbol
2121 [21668] network: resolv: res_init cross-thread broadcast introduces race
2123 [21687] math: tgmath.h totalorder, totalordermag return type
2124 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2126 [21696] libc: Incorrect assumption of of __cpu_mask in
2127 posix/sched_cpucount.c
2128 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2129 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2131 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2132 leading to relocation crash
2133 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2134 `resolv_conf_matches (resp, conf)' failed.
2135 [21710] localedata: Added Samoan language locale for Samoa
2136 [21711] localedata: Pashto yesstr/nostr locale are missing
2137 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2138 __have_pthread_attr_t can cause redefinition of typedef âpthread_attr_tâ
2139 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2140 [21723] localedata: yesstr/nostr missing for Chinese language locale
2141 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2143 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2145 [21728] localedata: New Locale for Tongan language
2146 [21729] localedata: incorrect LC_NAME fields for hi_IN
2147 [21733] localedata: yesstr and nostr are missing for zh_HK
2148 [21734] localedata: Missing yesstr and nostr are for kw_GB
2149 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2150 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2151 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2152 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2154 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2156 [21749] localedata: Wrong abbreviated day name (âabdayâ) for
2158 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2159 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2160 [21759] localedata: missing yesstr and nostr for Tigrinya
2161 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2162 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2163 [21767] localedata: Missing Bislama locales
2164 [21768] localedata: Missing yesstr and nostr for aa_ET
2165 [21770] localedata: Missing Field in li_NL
2166 [21778] nptl: Robust mutex may deadlock
2167 [21779] libc: MicroBlaze segfaults when loading libpthread
2168 [21783] localedata: Fix int_select international_call_prefixes
2169 [21784] localedata: Inconsistency in country_isbn
2170 [21788] localedata: Missing Country Postal Abbreviations
2171 [21794] localedata: Added-country_isbn-for-Italy
2172 [21795] localedata: Add/Fix country_isbn for France
2173 [21796] localedata: Added country_isbn for Republic of Korea
2174 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2175 [21799] localedata: Added int_select international_call_prefixes
2176 [21801] localedata: Added int_select international_call_prefixes
2177 [21804] nptl: Double semicolon in thread-shared-types.h
2178 [21807] localedata: LC_ADDRESS fix for pap_CW
2179 [21808] localedata: Fix LC_ADDRESS for pap_AW
2180 [21821] localedata: Added country_name in mai_IN
2181 [21822] localedata: Fix LC_TIME for mai_IN
2182 [21823] localedata: missing yesstr, nostr for sa_IN
2183 [21825] localedata: Fix name_mrs for mag_IN
2184 [21828] localedata: 2.26 changelog should mention user visible changes
2186 [21835] localedata: Added Maithili language locale for Nepal
2187 [21838] localedata: Removed redundant data for the_NP
2188 [21839] localedata: Fix LC_MONETARY for ta_LK
2189 [21844] localedata: Fix Latin characters and Months Sequence.
2190 [21848] localedata: Fix mai_NP Title Name
2195 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2196 24731-2:2010, is supported to enable declarations of functions from that
2197 TR. Note that not all functions from that TR are supported by the GNU C
2200 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2201 18661-1:2014, is supported to enable declarations of functions and macros
2202 from that TS. Note that not all features from that TS are supported by
2205 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2206 18661-4:2015, is supported to enable declarations of functions and macros
2207 from that TS. Note that most features from that TS are not supported by
2210 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2211 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2212 Since the GNU C Library defaults to a much newer revision of POSIX, this
2213 will only affect programs that specifically request an old conformance
2214 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2215 see a change in the visible declarations, but a program compiled with
2216 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2219 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2220 defined by all multithreaded code, but glibc has not required this for
2223 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2224 means that in a future release, the macros âmajorâ, âminorâ, and âmakedevâ
2225 will only be available from <sys/sysmacros.h>.
2227 These macros are not part of POSIX nor XSI, and their names frequently
2228 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2229 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2230 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2233 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2234 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2235 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2237 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2238 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2239 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2240 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2241 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2242 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2243 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2244 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2245 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2246 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2247 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2250 * New <math.h> features are added from TS 18661-1:2014:
2252 - Signaling NaN macros: SNANF, SNAN, SNANL.
2254 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2255 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2256 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2258 - llogb functions: the llogb, llogbf and llogbl functions, and the
2259 FP_LLOGB0 and FP_LLOGBNAN macros.
2261 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2264 - Comparison macros: iseqsig.
2266 - Classification macros: iscanonical, issubnormal, iszero.
2268 - Total order functions: totalorder, totalorderf, totalorderl,
2269 totalordermag, totalordermagf, totalordermagl.
2271 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2273 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2274 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2276 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2277 are added to libc. They convert a floating-point number into string.
2279 * Most of glibc can now be built with the stack smashing protector enabled.
2280 It is recommended to build glibc with --enable-stack-protector=strong.
2281 Implemented by Nick Alcock (Oracle).
2283 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2284 intended to be used instead of memset() to erase sensitive data after use;
2285 the compiler will not optimize out calls to explicit_bzero even if they
2286 are "unnecessary" (in the sense that no _correct_ program can observe the
2287 effects of the memory clear).
2289 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2290 to float instead of double. This does not affect the ABI of any libraries
2291 that are part of the GNU C Library, but may affect the ABI of other
2292 libraries that use this type in their interfaces.
2294 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2295 float_t and double_t types are now defined to long double instead of float
2296 and double. These options are not the default, and this does not affect
2297 the ABI of any libraries that are part of the GNU C Library, but it may
2298 affect the ABI of other libraries that use this type in their interfaces,
2299 if they are compiled or used with those options.
2301 * The getentropy and getrandom functions, and the <sys/random.h> header file
2304 * The buffer size for byte-oriented stdio streams is now limited to 8192
2305 bytes by default. Previously, on Linux, the default buffer size on most
2306 file systems was 4096 bytes (and thus remains unchanged), except on
2307 network file systems, where the buffer size was unpredictable and could be
2308 as large as several megabytes.
2310 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2311 for the Linux quota interface which predates kernel version 2.4.22 has
2314 * The malloc_get_state and malloc_set_state functions have been removed.
2315 Already-existing binaries that dynamically link to these functions will
2316 get a hidden implementation in which malloc_get_state is a stub. As far
2317 as we know, these functions are used only by GNU Emacs and this change
2318 will not adversely affect already-built Emacs executables. Any undumped
2319 Emacs executables, which normally exist only during an Emacs build, should
2320 be rebuilt by re-running â./configure; makeâ in the Emacs build tree.
2322 * The âip6-dotintâ and âno-ip6-dotintâ resolver options, and the
2323 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2324 âno-ip6-dotintâ had already been the default, and support for the
2325 âip6-dotintâ option was removed from the Internet in 2006.
2327 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2328 flag from <resolv.h> have been removed. The option relied on a
2329 backwards-incompatible DNS extension which was never deployed on the
2332 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2333 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2334 They were already unimplemented.
2336 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2337 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2338 removed again from the IETF name lookup interface specification in RFC
2339 2553. Applications should use getaddrinfo instead.
2341 * DNSSEC-related declarations and definitions have been removed from the
2342 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2343 decode the data part of DNSSEC record types. Previous versions of glibc
2344 only implemented minimal support for the previous version of DNSSEC, which
2345 is incompatible with the currently deployed version.
2347 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2348 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2349 <arpa/nameser.h> header file because the distinction between RR types and
2350 meta-RR types is not officially standardized, subject to revision, and
2351 thus not suitable for encoding in a macro.
2353 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2354 and rhook members of the res_state type in <resolv.h> have been removed.
2355 The glibc stub resolver did not support these hooks, but the header file
2356 did not reflect that.
2358 * For multi-arch support it is recommended to use a GCC which has
2359 been built with support for GNU indirect functions. This ensures
2360 that correct debugging information is generated for functions
2361 selected by IFUNC resolvers. This support can either be enabled by
2362 configuring GCC with '--enable-gnu-indirect-function', or by
2363 enabling it by default by setting 'default_gnu_indirect_function'
2364 variable for a particular architecture in the GCC source file
2367 * GDB pretty printers have been added for mutex and condition variable
2368 structures in POSIX Threads. When installed and loaded in gdb these pretty
2369 printers show various pthread variables in human-readable form when read
2370 using the 'print' or 'display' commands in gdb.
2372 * Tunables feature added to allow tweaking of the runtime for an application
2373 program. This feature can be enabled with the '--enable-tunables' configure
2374 flag. The GNU C Library manual has details on usage and README.tunables has
2375 instructions on adding new tunables to the library.
2377 * A new version of condition variables functions have been implemented in
2378 the NPTL implementation of POSIX Threads to provide stronger ordering
2381 * A new version of pthread_rwlock functions have been implemented to use a more
2382 scalable algorithm primarily through not using a critical section anymore to
2385 Security related changes:
2387 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2388 have been created with makecontext could fail to terminate due to a
2389 missing .cantunwind annotation. This has been observed to lead to a hang
2390 (denial of service) in some Go applications compiled with gccgo. Reported
2391 by Andreas Schwab. (CVE-2016-6323)
2393 * The DNS stub resolver functions would crash due to a NULL pointer
2394 dereference when processing a query with a valid DNS question type which
2395 was used internally in the implementation. The stub resolver now uses a
2396 question type which is outside the range of valid question type values.
2399 The following bugs are resolved with this release:
2401 [4099] stdio: Overly agressive caching by stream i/o functions.
2402 [7065] build: Support building glibc with -fstack-protector or -fstack-
2404 [9842] localedata: en_CA: incorrect date format
2405 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2406 before it started waiting
2407 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2408 [15765] nptl: sem_open is wrongly a cancellation point
2409 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2410 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2412 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2413 library linked with pthread
2414 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2415 "FIXME: Ingo" issue)
2416 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2417 [17252] libc: getrandom and getentropy syscall
2418 [17730] malloc: thread-local storage is sometimes improperly free()'d
2419 after being __libc_memalign()'d
2420 [18241] stdio: failed fseek on memstream does not set errno and can fail
2422 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2424 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2425 PTHREAD_PRIO_INHERIT mutex on ARM
2426 [18784] network: res_query and related function crash for special record
2427 type queries (CVE-2015-5180)
2428 [19380] math: strtod does not raise "inexact"
2429 [19387] string: Integer overflow in memchr
2430 [19390] string: Integer overflow in strncat
2431 [19398] build: linknamespace tests fail with massively parallel build
2432 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2434 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2435 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2436 [19514] libc: [PATCH] Fix spelling errors in spelling
2437 "implement"/"implementation" in several places
2438 [19582] network: Deprecate RES_USE_INET6
2439 [19673] manual: clog10 docs appear to be erroneous
2440 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2441 causes a segmentation fault
2442 [19826] libc: invalid pointer returned from __tls_get_addr with static
2444 [20016] network: resolv: Remove hooks support from the API
2445 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2447 [20033] math: [x86_64] vectorized math function don't call the __finite
2449 [20116] nptl: use after free in pthread_create
2450 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2451 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2453 [20311] nptl: please install proc_service.h
2454 [20366] libc: Compilation errors in installed headers in strict-compliance
2456 [20370] malloc: malloc: Arena free list management is still racy
2457 (incorrect fix in bug 19243)
2458 [20386] libc: assert (X = 0) does not result in GCC warning
2459 [20432] malloc: malloc: Minimize interface required for interposition
2460 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2461 in _Unwind_Backtrace (CVE-2016-6323)
2462 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2463 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2465 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2466 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2467 [20477] network: resolv: incorrect double-checked locking related to
2469 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2471 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2473 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2474 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2475 cause transition penalty
2476 [20517] math: sparcv9 missing fdiml compat symbol
2477 [20524] manual: strverscmp is inconsistent
2478 [20525] libc: <sys/quota.h> should be based on kernel headers
2479 [20539] math: GCC 7 -static -lm fails to link at -O3
2480 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2482 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2484 [20591] network: Remove obsolete DNSSEC support
2485 [20592] network: DNS resource record type classification macros in
2486 <arpa/nameser.h> are incorrect
2487 [20593] network: Update DNS RR type definitions
2488 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2489 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2491 [20629] network: libresolv: Remove support for bitstring labels
2493 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2494 assertion: "maxidx >= 2"
2495 [20660] math: [arm] Use VSQRT
2496 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2497 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2498 [20689] libc: Test for FMA should also check for AVX.
2499 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2500 [20715] math: iszero macro breaks existing code
2501 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2502 [20728] libc: powerpc: Missing TOC stub in clone
2503 [20729] build: glibc-2.24 fails to build for i486 with -Os
2504 [20750] build: Build fails with default PIE enabled gcc-6.x
2505 [20768] math: [alpha] sqrt fegetenv namespace
2506 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2508 [20787] math: float_t is defined as float incorrectly on x86_64 even if
2509 __FLT_EVAL_METHOD__ is 2
2510 [20790] network: rpcgen buffer overrun in get_prog_declaration
2511 [20822] nptl: race condition in __lll_unlock_elision on powerpc
2512 [20829] libc: crypt snprintf namespace
2513 [20847] libc: tst-vfork3 failure
2514 [20855] math: Default bits/mathdef.h has inappropriate float_t
2515 [20859] math: [sh4] FP_ILOGB0 invalid
2516 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2517 U+20AC), not same as GBK
2518 [20915] dynamic-link: global-dynamic TLS broken on aarch64
2519 [20916] math: pow handling of sNaN arguments
2520 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2521 [20919] math: Bad pow (qNaN, 0) result with -lieee
2522 [20940] math: hypot sNaN handling
2523 [20947] math: fmax, fmin sNaN handling
2524 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2525 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2527 [20971] string: powerpc64/power7 memchr overflows internal pointer check
2528 [20973] nptl: robust mutexes: Lost wake-ups
2529 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2530 [20978] nis: strlen on null pointer in nss_nisplus
2531 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2533 [21014] string: i686 memchr overflows internal pointer check
2534 [21019] libc: [mips] n32 lseek incorrect on overflow
2535 [21022] libc: [microblaze] __backtrace get_frame_size namespace
2536 [21026] libc: [MIPS] readahead syscall is broken on n64
2537 [21028] math: Fallback fesetexceptflag should always succeed
2538 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2539 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2541 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2542 [21061] librt: [microblaze] librt lost clock_* exports
2543 [21073] libc: tunables: insecure environment variables passed to
2544 subprocesses with AT_SECURE
2545 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2549 * The minimum Linux kernel version that this version of the GNU C Library
2550 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2551 kernel version 2.6.32 or later suffices (on architectures that already
2552 required kernel versions more recent than 3.2, those requirements remain
2553 unchanged). Linux 3.2 or later kernel headers are required on all
2556 * The pap_AN locale has been deleted. This has been deprecated for a long
2557 time. It has been replaced by pap_AW & pap_CW, both of which have long
2558 been included in previous releases.
2560 * The readdir_r and readdir64_r functions have been deprecated. It is
2561 recommended to use readdir and readdir64 instead.
2563 * The type âunion waitâ has been removed. It was deprecated in the early
2564 1990s and never part of POSIX. Application code should use the int type
2565 instead of âunion waitâ.
2567 * A new NSS action is added to facilitate large distributed system
2568 administration. The action, MERGE, allows remote user stores like LDAP
2569 to be merged into local user stores like /etc/groups in order to provide
2570 easy to use, updated, and managed sets of merged credentials. The new
2571 action can be used by configuring it in /etc/nsswitch.conf:
2572 group: files [SUCCESS=merge] nis
2573 Implemented by Stephen Gallagher (Red Hat).
2575 * The deprecated __malloc_initialize_hook variable has been removed from the
2578 * The long unused localedef --old-style option has been removed. It hasn't
2579 done anything in over 16 years. Scripts using this option can safely
2582 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2583 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
2584 return the next representable value in the direction of positive infinity
2585 and the nextdown functions return the next representable value in the
2586 direction of negative infinity. These are currently enabled as GNU
2589 Security related changes:
2591 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
2592 could result in a stack overflow when getnetbyname was called with an
2593 overly long name. (CVE-2016-3075)
2595 * Previously, getaddrinfo copied large amounts of address data to the stack,
2596 even after the fix for CVE-2013-4458 has been applied, potentially
2597 resulting in a stack overflow. getaddrinfo now uses a heap allocation
2598 instead. Reported by Michael Petlan. (CVE-2016-3706)
2600 * The glob function suffered from a stack-based buffer overflow when it was
2601 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2602 Reported by Alexander Cherepanov. (CVE-2016-1234)
2604 * The Sun RPC UDP client could exhaust all available stack space when
2605 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
2606 alloca plugin for GCC. (CVE-2016-4429)
2608 * The IPv6 name server management code in libresolv could result in a memory
2609 leak for each thread which is created, performs a failing naming lookup,
2610 and exits. Over time, this could result in a denial of service due to
2611 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
2613 The following bugs are resolved with this release:
2615 [1170] localedata: ne_NP: update Nepali locale definition file
2616 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2618 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2619 [6796] math: fdim() does not set errno on overflow
2620 [10354] libc: posix_spawn should use vfork() in more cases than presently
2621 [11213] localedata: localedata: add copyright disclaimer to locale files
2622 [12143] localedata: chr_US: new Cherokee locale
2623 [12450] localedata: sgs_LT: new locale
2624 [12676] localedata: ln_CD: new locale
2625 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2627 [13304] math: fma, fmaf, fmal produce wrong results
2628 [14259] build: --localedir arg to configure is ignored
2629 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2630 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2631 [14934] localedata: es_CL: wrong first weekday chilean locale
2632 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2634 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2636 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2637 [15368] nptl: raise() is not async-signal-safe
2638 [15479] math: ceil, floor, round and trunc raise inexact exception
2639 [15578] localedata: kk_KZ: various updates
2640 [16003] localedata: pap_AN: punt old locale
2641 [16137] localedata: iw_IL: punt old locale
2642 [16190] localedata: eo: new esperanto locale
2643 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2644 [16742] malloc: race condition: pthread_atfork() called before first
2645 malloc() results in unexpected locking behaviour/deadlocks
2646 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2648 [16983] localedata: postal_fmt does not allow %l and %n modifiers
2649 [17565] localedata: pt_PT: wrong (work-)week start
2650 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2651 [17950] build: Build fails with -msse
2652 [18205] localedata: be_BY*: wrong first_weekday and first_workday
2653 [18433] libc: posix_spawn does not return correctly upon failure to
2655 [18453] localedata: charmaps/IBM875: incorrect codes
2656 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2658 [18896] localedata: he_IL: improvements for currency
2659 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2660 Romanian locale data
2661 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2663 [19056] libc: Deprecate readdir_r
2664 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2666 [19198] localedata: nl_NL: small improvements for Dutch locales
2667 [19257] network: Per-thread memory leak in __res_vinit with IPv6
2668 nameservers (CVE-2016-5417)
2669 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2671 [19400] locale: Language missing in "iso-639.def", trivial fix in
2673 [19431] malloc: Deadlock between fflush, getdelim, and fork
2674 [19505] libc: Incorrect file descriptor validity checks in
2675 posix_spawn_file_actions_add{open,close,dup2}
2676 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2677 when using RTLD_NEXT
2678 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2679 `intl/{gettextP,loadinfo}.h'
2680 [19534] libc: execle, execlp may use malloc
2681 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
2682 [19573] network: res_nclose and __res_maybe_init disagree about name
2683 server initialization, breaking Hesiod
2684 [19575] localedata: Status of GB18030 tables
2685 [19581] localedata: sr_* date_fmt string contains additional newline
2686 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
2688 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
2689 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
2690 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
2691 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
2693 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
2695 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
2697 [19610] dynamic-link: ldconfig -X removes stale symbolic links
2698 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
2699 [19633] locale: strfmon_l applies global locale to number formatting
2700 [19642] network: Memory leak in getnameinfo
2701 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
2702 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
2704 [19654] math: [x86_64] Need testcase for BZ #19590 fix
2705 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
2707 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
2708 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
2710 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
2712 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
2714 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
2715 pointers and lengths in error-case.
2716 [19727] locale: Converting from/to UTF-xx with iconv() does not always
2717 report errors on UTF-16 surrogates values.
2718 [19755] nscd: nscd assertion failure in gc
2719 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
2720 [19759] libc: mempcpy shouldn't be inlined
2721 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
2722 [19765] libc: s390 needs an optimized mempcpy
2723 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
2724 NAME_MAX limit assumption (CVE-2016-1234)
2725 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
2726 [19787] network: Missing and incorrect truncation checks in getnameinfo
2727 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
2729 [19791] network: Assertion failure in res_query.c with un-connectable name
2731 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
2732 [19822] math: libm.so install clobbers old version
2733 [19825] network: resolv: send_vc can return uninitialized data in second
2734 response to getaddrinfo
2735 [19830] network: nss_dns: should check RDATA length against buffer length
2736 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
2737 confronted with A/AAAA records of invalid size
2738 [19837] nss: nss_db: No retries for some long lines with a larger buffer
2739 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
2740 [19853] stdio: Printing IBM long double in decimal with high precision is
2742 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
2743 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
2744 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
2746 [19865] network: Assertion failure or memory leak in
2747 _nss_dns_getcanonname_r
2748 [19868] network: nss_dns: netent code does not skip over non-PTR records
2749 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
2751 [19881] string: Improve x86-64 memset
2752 [19907] string: Incorrect memcpy tests
2753 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
2755 [19925] libc: termios.h XCASE namespace
2756 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
2757 [19929] libc: limits.h NL_NMAX namespace
2758 [19931] stdio: Memory leak in vfprintf
2759 [19957] libc: clone(CLONE_VM) access invalid parent memory
2760 [19963] localedata: en_IL: New locale
2761 [19989] stdio: stdio.h cuserid namespace
2762 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
2764 [19996] locale: langinfo.h nl_langinfo_l namespace
2765 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
2766 [20010] network: getaddrinfo: Stack overflow in hostent translation
2768 [20012] stdio: libio: fmemopen append mode failure
2769 [20014] stdio: stdio.h namespace for pre-threads POSIX
2770 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
2771 [20023] libc: fcntl.h timespec namespace
2772 [20024] math: [x86_64] vectorized sincos trashes the stack
2773 [20031] network: nss_hesiod: Heap overflow in get_txt_records
2774 [20041] time: sys/time.h timespec namespace
2775 [20043] libc: unistd.h missing cuserid for UNIX98 and before
2776 [20044] libc: unistd.h missing pthread_atfork for UNIX98
2777 [20051] libc: ttyslot in wrong header under wrong conditions
2778 [20054] libc: gethostname not declared for XPG4
2779 [20055] libc: termios.h missing tcgetsid for XPG4
2780 [20072] dynamic-link: x86 init_cpu_features is called twice in static
2782 [20073] libc: sys/stat.h fchmod namespace
2783 [20074] libc: stdlib.h rand_r namespace
2784 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
2785 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
2787 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
2788 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
2790 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
2791 [20119] libc: Wrong mask for processors level type from CPUID
2792 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
2793 AS not supporting AVX512
2794 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
2796 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
2797 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
2799 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
2800 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
2801 [20178] libc: posix_spawn{p} should not call exit
2802 [20191] stdio: libio: vtables hardening
2803 [20195] string: FMA4 detection requires CPUID execution with register
2805 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
2806 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
2808 [20212] math: acos (sNaN) returns sNaN
2809 [20213] math: asin (sNaN) returns sNaN
2810 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
2811 [20218] math: [i386] asinhl (sNaN) returns sNaN
2812 [20219] math: [i386] atanhl (sNaN) returns sNaN
2813 [20222] stdio: fopencookie: Mangle function pointers
2814 [20224] math: [i386] cbrtl (sNaN) returns sNaN
2815 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
2816 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
2818 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
2819 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
2820 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
2821 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
2822 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
2823 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
2824 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
2825 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
2826 [20240] math: modf (sNaN) returns sNaN
2827 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
2828 [20250] math: frexp (sNaN) returns sNaN
2829 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
2830 [20255] math: [i386] fdim, fdimf return with excess range and precision /
2832 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
2833 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
2834 subscript is below array bounds [-Werror=array-bounds]
2835 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
2836 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
2838 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
2839 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
2841 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
2842 "invalid" exceptions
2843 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
2844 [20316] localedata: id_ID: Februari instead of Pebruari
2845 [20327] string: POWER8 strcasecmp returns incorrect result
2846 [20347] math: Failure: Test: j0_downward (0xap+0)
2847 [20348] libc: FAIL: misc/tst-preadvwritev64
2848 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
2849 [20350] libc: There is no test for p{read,write}64
2850 [20357] math: Incorrect cos result for 1.5174239687223976
2851 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
2855 * Unicode 8.0.0 Support: Character encoding, character type info, and
2856 transliteration tables are all updated to Unicode 8.0.0, using new
2857 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
2858 These updates cause user visible changes, such as the fixes for bugs
2859 89, 16061, and 18568.
2861 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
2862 kernel-internal CPU set size. This means that requests that change the
2863 CPU affinity which failed before (for example, an all-ones CPU mask) will
2864 now succeed. Applications that need to determine the effective CPU
2865 affinities need to call sched_getaffinity or pthread_getaffinity_np after
2866 setting it because the kernel can adjust it (and the previous size check
2867 would not detect this in the majority of cases).
2869 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
2870 the following new symbols are used: fts64_children, fts64_close,
2871 fts64_open, fts64_read and fts64_set.
2873 * getaddrinfo now detects certain invalid responses on an internal netlink
2874 socket. If such responses are received, an affected process will
2875 terminate with an error message of "Unexpected error <number> on netlink
2876 descriptor <number>" or "Unexpected netlink response of size <number> on
2877 descriptor <number>". The most likely cause for these errors is a
2878 multi-threaded application which erroneously closes and reuses the netlink
2879 file descriptor while it is used by getaddrinfo.
2881 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
2882 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
2883 unnecessary serialization of memory allocation requests across threads.
2884 The defect is now corrected. Users should see a substantial increase in
2885 the concurent throughput of allocation requests for applications which
2886 trigger this bug. Affected applications typically create and
2887 destroy threads frequently. (Bug 19048 was reported and analyzed by
2890 * There is now a --disable-timezone-tools configure option for disabling the
2891 building and installing of the timezone related utilities (zic, zdump, and
2892 tzselect). This is useful for people who build the timezone data and code
2893 independent of the GNU C Library.
2895 * The obsolete header <regexp.h> has been removed. Programs that require
2896 this header must be updated to use <regex.h> instead.
2898 * The obsolete functions bdflush, create_module, get_kernel_syms,
2899 query_module and uselib are no longer available to newly linked binaries;
2900 the header <sys/kdaemon.h> has been removed. These functions and header
2901 were specific to systems using the Linux kernel and could not usefully be
2902 used with the GNU C Library on systems with version 2.6 or later of the
2905 * Optimized string, wcsmbs and memory functions for IBM z13.
2906 Implemented by Stefan Liebler.
2908 * Newly linked programs that define a variable called signgam will no longer
2909 have it set by the lgamma, lgammaf and lgammal functions. Programs that
2910 require signgam to be set by those functions must ensure that they use the
2911 variable provided by the GNU C Library and declared in <math.h>, without
2912 defining their own copy.
2914 * The minimum GCC version that can be used to build this version of the GNU
2915 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
2916 still be used to compile programs using the GNU C Library.
2918 Security related changes:
2920 * An out-of-bounds value in a broken-out struct tm argument to strftime no
2921 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
2923 * The LD_POINTER_GUARD environment variable can no longer be used to disable
2924 the pointer guard feature. It is always enabled. Previously,
2925 LD_POINTER_GUARD could be used to disable security hardening in binaries
2926 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
2929 * An integer overflow in hcreate and hcreate_r could lead to an
2930 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
2932 * The catopen function no longer has unbounded stack usage. Reported by
2933 Max. (CVE-2015-8779)
2935 * The nan, nanf and nanl functions no longer have unbounded stack usage
2936 depending on the length of the string passed as an argument to the
2937 functions. Reported by Joseph Myers. (CVE-2014-9761)
2939 * A stack-based buffer overflow was found in libresolv when invoked from
2940 libnss_dns, allowing specially crafted DNS responses to seize control
2941 of execution flow in the DNS client. The buffer overflow occurs in
2942 the functions send_dg (send datagram) and send_vc (send TCP) for the
2943 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
2944 family. The use of AF_UNSPEC triggers the low-level resolver code to
2945 send out two parallel queries for A and AAAA. A mismanagement of the
2946 buffers used for those queries could result in the response of a query
2947 writing beyond the alloca allocated buffer created by
2948 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
2949 the overflow. Thanks to the Google Security Team and Red Hat for
2950 reporting the security impact of this issue, and Robert Holiday of
2951 Ciena for reporting the related bug 18665. (CVE-2015-7547)
2953 The following bugs are resolved with this release:
2955 [89] localedata: Locales nb_NO and nn_NO should transliterate ÊÞÄ
2956 [887] math: Math library function "logb" and "nextafter" inconsistent
2957 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
2958 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
2959 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
2960 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
2962 [4404] localedata: German translation of "Alarm clock" is misleading
2963 [6799] math: nextafter() and nexttoward() doen't set errno on
2964 overflow/underflow errors
2965 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
2967 [10432] nis: _nss_nis_setnetgrent assertion failure
2968 [11460] libc: fts has no LFS support
2969 [12926] network: getaddrinfo()/make_request() may spin forever
2970 [13065] nptl: Race condition in pthread barriers
2971 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
2972 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
2974 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
2975 [14912] libc: Rename non-installed bits/*.h headers
2976 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
2977 [15367] math: Let gcc use __builtin_isinf
2978 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
2979 [15421] math: lgamma wrongly sets signgam for ISO C
2980 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
2981 FE_INVALID with argument out of range
2982 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
2984 [15786] dynamic-link: ifunc resolver functions can smash function
2986 [15918] math: Unnecessary check for equality in hypotf()
2987 [16061] localedata: Review / update transliteration data
2988 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
2990 [16141] time: strptime %z offset restriction
2991 [16171] math: drem should be alias of remainder
2992 [16296] math: fegetround is pure?
2993 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
2994 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
2996 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
2997 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
2999 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3000 "Exception "Inexact" set" on ppc32
3001 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3002 [16517] math: Missing underflow exception from tanf/tan/tanl
3003 [16519] math: Missing underflow exception from sinhf
3004 [16520] math: Missing underflow exception from tanhf
3005 [16521] math: Missing underflow exception from exp2
3006 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3008 [16734] stdio: fopen calls mmap to allocate its buffer
3009 [16961] math: nan function incorrect handling of bad sequences
3010 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3011 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3012 [16985] locale: localedef: confusing error message when opening output
3014 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3015 [17197] locale: Redundant shift character in iconv conversion output at
3017 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3018 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3019 [17250] dynamic-link: static linking breaks nss loading
3020 (getaddrinfo/getpwnam/etc...)
3021 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3023 [17441] math: isnan() should use __builtin_isnan() in GCC
3024 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3025 (related to lock elision)
3026 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3027 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3028 [17887] time: strptime should be able to parse "+01:00" style timezones
3029 [17905] libc: catopen() Multiple unbounded stack allocations
3031 [18084] libc: backtrace (..., 0) dumps core on x86
3032 [18086] libc: nice() sets errno to 0 on success
3033 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3034 is too large (CVE-2015-8778)
3035 [18251] dynamic-link: SONAME missing when audit modules provides path
3036 [18265] libc: add attributes for wchar string and memory functions
3037 [18370] math: csqrt missing underflows
3038 [18421] libc: [hppa] read-only segment has dynamic relocations
3039 [18472] libc: Obsolete syscall wrappers should be compat symbols
3040 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3041 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3042 [18525] localedata: Remove locale timezone information
3043 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3044 [18568] localedata: Update locale data to Unicode 8.0
3045 [18589] locale: sort-test.sh fails at random
3046 [18595] math: ctan, ctanh missing underflows
3047 [18604] libc: assert macro-expands its argument
3048 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3049 contains a vector instruction exception.
3050 [18611] math: j1, jn missing errno setting on underflow
3051 [18618] localedata: sync Chechen locale definitions with other *_RU
3053 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3054 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3055 [18665] network: In send_dg, the recvfrom function is NOT always using the
3056 buffer size of a newly created buffer (CVE-2015-7547)
3057 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3059 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3061 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3062 [18699] math: tilegx cproj() for various complex infinities does not yield
3064 [18724] libc: Harden put*ent functions against data injection
3065 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3066 [18755] build: build errors with -DNDEBUG
3067 [18757] stdio: fmemopen fails to set errno on failure
3068 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3070 [18781] libc: openat64 lacks O_LARGEFILE
3071 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3072 error: canât find a register in class âR1_REGSâ while reloading âasmâ
3073 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3074 [18790] math: [ldbl-128ibm] tanhl inaccurate
3075 [18795] libc: stpncpy fortification misses buffer lengths that are
3076 statically too large
3077 [18796] build: build fails for --disable-mathvec
3078 [18803] math: hypot missing underflows
3079 [18820] stdio: fmemopen may leak memory on failure
3080 [18823] math: csqrt spurious underflows
3081 [18824] math: fma spurious underflows
3082 [18825] math: pow missing underflows
3083 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3084 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3085 [18870] build: sem_open.c fails to compile with missing symbol
3087 [18872] stdio: Fix memory leak in printf_positional
3088 [18873] libc: posix_fallocate overflow check ineffective
3089 [18875] math: Excess precision leads incorrect libm
3090 [18877] libc: arm: mmap offset regression
3091 [18887] libc: memory corruption when using getmntent on blank lines
3092 [18918] localedata: hu_HU: change time to HH:MM:SS format
3093 [18921] libc: Regression: extraneous stat() and fstat() performed by
3095 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3096 binaries (CVE-2015-8777)
3097 [18951] math: tgamma missing underflows
3098 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3100 [18953] localedata: lt_LT: change currency symbol to the euro
3101 [18956] math: powf inaccuracy
3102 [18961] math: [i386] exp missing underflows
3103 [18966] math: [i386] exp10 missing underflows
3104 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3105 [18969] build: multiple string test failures due to missing locale
3107 [18970] libc: Reference of pthread_setcancelstate in libc.a
3108 [18977] math: float / long double Bessel functions not in XSI POSIX
3109 [18980] math: i386 libm functions return with excess range and precision
3110 [18981] math: i386 scalb*, ldexp return with excess range and precision
3111 [18982] stdio: va_list and vprintf
3112 [18985] time: Passing out of range data to strftime() causes a segfault
3114 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3115 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3116 [19012] locale: iconv_open leaks memory on error path
3117 [19016] math: clog, clog10 inaccuracy
3118 [19018] nptl: Mangle function pointers in tls_dtor_list
3119 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3120 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3121 [19048] malloc: malloc: arena free list can become cyclic, increasing
3123 [19049] math: [powerpc] erfc incorrect zero sign
3124 [19050] math: [powerpc] log* incorrect zero sign
3125 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3126 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3127 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3128 [19074] network: Data race in _res_hconf_reorder_addrs
3129 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3130 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3131 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3133 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3135 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3136 [19086] manual: posix_fallocate64 documented argument order is wrong.
3137 [19088] math: lround, llround missing exceptions close to overflow
3139 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3140 [19095] math: dbl-64 lrint incorrect for 64-bit long
3141 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3142 [19124] dynamic-link: ld.so failed to build with older assmebler
3143 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3144 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3145 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3146 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3147 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3148 pthread_setaffinity_np
3149 [19156] math: [ldbl-128] j0l spurious underflows
3150 [19164] nptl: tst-getcpu fails with many possible CPUs
3151 [19168] math: math/test-ildoubl and math/test-ldouble failure
3152 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3153 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3155 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3156 (FE_NOMASK_ENV) do not clear SSE exceptions
3157 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3158 _int_new_arena/reused_arena
3159 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3160 [19201] math: dbl-64 remainder incorrect sign of zero result
3161 [19205] math: bits/math-finite.h conditions do not match math.h and
3163 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3164 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3165 for C99-based standards
3166 [19212] libc: features.h not -Wundef clean
3167 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3169 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3170 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3171 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3173 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3174 "inexact" exceptions
3175 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3177 [19242] libc: strtol incorrect in Turkish locales
3178 [19243] malloc: reused_arena can pick an arena on the free list, leading
3179 to an assertion failure and reference count corruption
3180 [19253] time: tzset() ineffective when temporary TZ did not include DST
3182 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3183 [19270] math: [hppa] Shared libm missing __isnanl
3184 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3185 MAP_HUGETLB and MAP_STACK defines
3186 [19313] nptl: Wrong __cpu_mask for x32
3187 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3188 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3189 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3190 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3191 [19363] time: x32: times() return value wrongly truncates/sign extends
3193 [19367] dynamic-link: Improve branch prediction on Silvermont
3194 [19369] network: Default domain name not reset by res_ninit when "search"
3195 / "domain" entry is removed from resolv.conf
3196 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3198 [19385] localedata: bg_BG: time separator should be colon, not comma
3199 [19408] libc: linux personality syscall wrapper may erroneously return an
3200 error on 32-bit architectures
3201 [19415] libc: dladdr returns wrong names on hppa
3202 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3203 IBM905, IBM907, and IBM909
3204 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3205 [19443] build: build failures with -DDEBUG
3206 [19451] build: Make check fails on test-double-vlen2
3207 [19462] libc: Glibc failed to build with -Os
3208 [19465] math: Wrong code with -Os
3209 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3211 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3213 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3214 [19486] math: S390: Math tests fail with "Exception Inexact set".
3215 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3216 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3218 [19590] math: Fail to build shared objects that use libmvec.so functions.
3222 * The following bugs are resolved with this release:
3224 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3225 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3226 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3227 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3228 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3229 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3230 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3231 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3232 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3233 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3234 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3235 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3236 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3237 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3238 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3239 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3240 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3241 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3242 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3243 18657, 18676, 18694, 18696, 18887.
3245 * Cache information can be queried via sysconf() function on s390 e.g. with
3246 _SC_LEVEL1_ICACHE_SIZE as argument.
3248 * A buffer overflow in gethostbyname_r and related functions performing DNS
3249 requests has been fixed. If the NSS functions were called with a
3250 misaligned buffer, the buffer length change due to pointer alignment was
3251 not taken into account. This could result in application crashes or,
3252 potentially arbitrary code execution, using crafted, but syntactically
3253 valid DNS responses. (CVE-2015-1781)
3255 * The time zone file parser has been made more robust against crafted time
3256 zone files, avoiding heap buffer overflows related to the processing of
3257 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3258 large time zone data files. Overly long time zone specifiers in the TZ
3259 variable no longer result in stack overflows and crashes.
3261 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3262 for LD and GD on x86 and x86-64, has been implemented. You will need
3263 binutils-2.24 or later to enable this optimization.
3265 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3266 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3267 Hat). These updates cause user visible changes, such as the fix for bug
3270 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3271 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3272 condition in some applications.
3274 * Added vector math library named libmvec with the following vectorized x86_64
3275 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3277 The library can be disabled with --disable-mathvec. Use of the functions is
3278 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3279 Shared library libmvec.so is linked in as needed when using -lm (no need to
3280 specify -lmvec explicitly for not static builds).
3281 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3283 * A new fmemopen implementation has been added with the goal of POSIX
3284 compliance. The new implementation fixes the following long-standing
3285 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3286 old implementation is still present for use be by existing binaries.
3288 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3289 releases. It has been fixed to match 2.19 and older, but binaries built
3290 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3292 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3293 Contributed by Roland McGrath (Google).
3295 * The header <regexp.h> is deprecated, and will be removed in a future
3296 release. Use of this header will trigger a deprecation warning.
3297 Application developers should update their code to use <regex.h> instead.
3299 This header was formerly part of SUS, but was deprecated in 1994 and
3300 removed from the standard in 2001. Also, the glibc implementation
3301 leaks memory. See BZ#18681 for more details.
3305 * The following bugs are resolved with this release:
3307 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3308 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3309 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3310 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3311 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3312 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3313 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3314 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3315 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3316 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3319 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3320 too little memory for the to-be-scanned arguments and overflow the
3321 allocated buffer. The implementation now correctly computes the required
3322 buffer size when using malloc, and switches to malloc from alloca as
3325 * A new semaphore algorithm has been implemented in generic C code for all
3326 machines. Previous custom assembly implementations of semaphore were
3327 difficult to reason about or ensure that they were safe. The new version
3328 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3329 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3330 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3332 * Port to Altera Nios II has been contributed by Mentor Graphics.
3334 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3335 implementations for powerpc64/powerpc64le.
3336 Implemented by Adhemerval Zanella (IBM).
3338 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3339 and powerpc64le. This may improve lock scaling of existing programs on
3340 HTM capable systems. The lock elision code is only enabled with
3341 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3342 powerpc will issue a transaction abort on every syscall to avoid side
3343 effects being visible outside transactions.
3345 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3346 AArch64. Contributed by ARM Ltd.
3348 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3350 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3351 under certain input conditions resulting in the execution of a shell for
3352 command substitution when the application did not request it. The
3353 implementation now checks WRDE_NOCMD immediately before executing the
3354 shell and returns the error WRDE_CMDSUB as expected.
3356 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3357 processing format strings with a large number of format specifiers.
3359 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3360 infinite loop if the DNS response contained a PTR record of an unexpected
3363 * The minimum GCC version that can be used to build this version of the GNU
3364 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3365 still be used to compile programs using the GNU C Library.
3367 * The GNU C Library is now built with -Werror by default. This can be
3368 disabled by configuring with --disable-werror.
3370 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3372 * The obsolete sigvec function has been removed. This was the original
3373 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3374 programs have been using instead for about 25 years. Of course, ABI
3375 compatibility for old binaries using sigvec remains intact.
3377 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3378 with newer versions of bison.
3380 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3381 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3382 registers overlay two consecutive single-precision registers. MIPS32R2
3383 introduced a new FPU mode (FR=1) where double-precision registers extend the
3384 corresponding single-precision registers which is incompatible with the
3385 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3386 require the use of FR=1 making a transition necessary. New o32 ABI
3387 extensions enable users to migrate over time from the original o32 ABI
3388 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3389 tracks the ABI of any loaded object and verifies that new objects are
3390 compatible. Mode transitions will also be requested as required and
3391 unsupportable objects will be rejected. The ABI checks include both soft and
3392 hard float ABIs for o32, n32 and n64.
3394 GCC 5 with GNU binutils 2.25 onwards:
3395 It is strongly recommended that all o32 system libraries are built using the
3396 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3397 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3398 compiler using --with-fp-32=xx to set this by default.
3402 * The following bugs are resolved with this release:
3404 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3405 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3406 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3407 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3408 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3409 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3410 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3411 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3412 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3413 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3414 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3415 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3416 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3417 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3418 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3420 * Reverted change of ABI data structures for s390 and s390x:
3421 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3422 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3423 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3424 are preserved pointing straight to the same implementation as the old ones.
3425 Given that, new callers will simply provide a too-big buffer to these
3426 functions. Any applications/libraries out there that embed jmp_buf or
3427 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3428 against 2.19 headers will have to rebuilt again. This is necessary in any
3429 case to revert the breakage in their ABI caused by the glibc change.
3431 * Support for file description locks is added to systems running the
3432 Linux kernel. The standard file locking interfaces are extended to
3433 operate on file descriptions, not file descriptors, via the use of
3434 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3435 are associated with an open file instead of a process.
3437 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3439 * The minimum Linux kernel version that this version of the GNU C Library
3440 can be used with is 2.6.32.
3442 * Running the testsuite no longer terminates as soon as a test fails.
3443 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3444 with PASS or FAIL lines for individual tests. A summary of the results is
3445 printed, including a list of failing lists, and "make check" exits with
3446 error status if there were any unexpected failures. "make check
3447 stop-on-test-failure=y" may be used to keep the old behavior.
3449 * The am33 port, which had not worked for several years, has been removed
3452 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3453 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3454 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3455 conflicted with POSIX (support for which was removed in 2.19), the
3456 interfaces those macros enabled remain available when compiling with
3457 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3458 test macros defined.
3460 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3462 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3463 This may improve lock scaling of existing programs on TX capable systems.
3464 The lock elision code is only built with --enable-lock-elision=yes and
3465 then requires a GCC version supporting the TX builtins. With lock elision
3466 default mutexes are elided via __builtin_tbegin, if the cpu supports
3467 transactions. By default lock elision is not enabled and the elision code
3470 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3471 copy the path argument. This allowed programs to cause posix_spawn to
3472 deference a dangling pointer, or use an unexpected pathname argument if
3473 the string was modified after the posix_spawn_file_actions_addopen
3476 * All supported architectures now use the main glibc sysdeps directory
3477 instead of some being in a separate "ports" directory (which was
3478 distributed separately before glibc 2.17).
3480 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3481 On configurations that support it (all Linux configurations), it's now
3482 used regardless of the --enable-add-ons switch to configure. It is no
3483 longer possible to build such configurations without pthreads support.
3485 * Locale names, including those obtained from environment variables (LANG
3486 and the LC_* variables), are more tightly checked for proper syntax.
3487 setlocale will now fail (with EINVAL) for locale names that are overly
3488 long, contain slashes without starting with a slash, or contain ".." path
3489 components. (CVE-2014-0475) Previously, some valid locale names were
3490 silently replaced with the "C" locale when running in AT_SECURE mode
3491 (e.g., in a SUID program). This is no longer necessary because of the
3494 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3495 with application code using Intel MPX instructions. (With all previous
3496 versions, the MPX register state could be clobbered when making calls
3497 into or out of a shared library.) Note that while the new dynamic
3498 linker is compatible with all known x86 hardware whether or not it
3499 supports Intel MPX, some x86 instruction-set emulators might fail to
3500 handle the new instruction encodings. This is known to affect Valgrind
3501 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3502 release), and might affect other tools that do instruction emulation.
3504 * Support for loadable gconv transliteration modules has been removed.
3505 The support for transliteration modules has been non-functional for
3506 over a decade, and the removal is prompted by security defects. The
3507 normal gconv conversion modules are still supported. Transliteration
3508 with //TRANSLIT is still possible, and the //IGNORE specifier
3509 continues to be supported. (CVE-2014-5119)
3511 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3512 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3513 resulting a denial-of-service security vulnerability in applications which
3514 use functions related to iconv. (CVE-2014-6040)
3518 * The following bugs are resolved with this release:
3520 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3521 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3522 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3523 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3524 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3525 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3526 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3527 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3528 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3529 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3530 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3531 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3532 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3533 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3534 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3535 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3536 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3537 16431, 16453, 16474, 16506, 16510, 16529
3539 * Slovenian translations for glibc messages have been contributed by the
3540 Translation Project's Slovenian team of translators.
3542 * The public headers no longer use __unused nor __block. This change is to
3543 support compiling programs that are derived from BSD sources and use
3544 __unused internally, and to support compiling with Clang's -fblock
3545 extension which uses __block.
3547 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3548 large collation sequences to optimize multiple passes. This cache
3549 computation may overflow for large collation sequences and may cause a
3550 stack or buffer overflow. This is now fixed to use a slower algorithm
3551 which does not use a cache if there is an integer overflow.
3553 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3554 rules for large collation sequences to optimize multiple passes and falls
3555 back to alloca if malloc fails, resulting in a possible stack overflow.
3556 The implementation now falls back to an uncached collation sequence lookup
3559 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3560 initialized for static applications resulting in the security feature
3561 being disabled. The pointer guard is now correctly initialized to a
3562 random value for static applications. Existing static applications need
3563 to be recompiled to take advantage of the fix (bug 15754).
3565 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3566 to the d_name member of struct dirent, or omit the terminating NUL
3567 character. (Bugzilla #14699).
3569 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3570 aligned_alloc functions could allocate too few bytes or corrupt the
3571 heap when passed very large allocation size values (Bugzilla #15855,
3574 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3575 for AF_INET6 has been fixed (Bugzilla #16072).
3577 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3578 pap_CW, quz_PE, the_NP.
3580 * Substantially revised locales: gd_GB, ht_HT
3582 * The LC_ADDRESS field was updated to support country_car for almost all
3585 * ISO 1427 definitions were updated.
3587 * ISO 3166 definitions were updated.
3589 * The localedef utility now supports --big-endian and --little-endian
3590 command-line options to generate locales for a different system from that
3591 for which the C library was built.
3593 * Binary locale files now only depend on the endianness of the system for
3594 which they are generated and not on other properties of that system. As a
3595 consequence, binary files generated with new localedef may be incompatible
3596 with old versions of the GNU C Library, and binary files generated with
3597 old localedef may be incompatible with this version of the GNU C Library,
3598 in the following circumstances:
3600 + Locale files may be incompatible on m68k systems.
3602 + Locale archive files (but not separate files for individual locales) may
3603 be incompatible on systems where plain "char" is signed.
3605 * The configure option --disable-versioning has been removed. Builds with
3606 --disable-versioning had not worked for several years.
3608 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3609 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3611 * SystemTap probes for malloc have been introduced.
3613 * SystemTap probes for slow multiple precision fallback paths of
3614 transcendental functions have been introduced.
3616 * Support for powerpc64le has been added.
3618 * The soft-float powerpc port now supports e500 processors.
3620 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3622 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3623 set of header declarations that are enabled by default, even when other
3624 feature test macros or compiler options such as -std=c99 would otherwise
3625 disable some of those declarations.
3627 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3628 conflict with POSIX. The libbsd-compat library (which was a dummy library
3629 that did nothing) has also been removed.
3631 * Preliminary documentation about Multi-Thread, Async-Signal and
3632 Async-Cancel Safety has been added.
3634 * Change of ABI data structures for s390 and s390x:
3635 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3636 allow for future hardware extensions. All library functions that accept or
3637 return these structures were versioned in order to provide backwards
3638 compatibility with existing code. However, not all cases can be handled
3639 with interface versioning. If an application embeds either structure into
3640 another structure and that structure is passed to another compilation unit
3641 which expects the newer larger-sized object then any access to the new
3642 fields will result in undefined behaviour. Similarly any access to fields
3643 that were moved by the enlarging of the structures will cause undefined
3644 behaviour. To fix the undefined behaviour all objects that are part of the
3645 final in-memory image must agree on the size of structures, and this may
3646 require recompilation.
3650 * The following bugs are resolved with this release:
3652 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3653 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3654 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3655 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3656 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3657 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3658 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3659 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3660 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3661 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3662 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3663 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3664 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3667 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3668 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3669 Distributions can re-enable building and using pt_chown via the new configure
3670 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
3671 considerable security risks and should only be used if the distribution
3672 understands and accepts the risks.
3674 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3677 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3678 fixed (Bugzilla #15330).
3680 * Add support for calling C++11 thread_local object destructors on thread
3681 and program exit. This needs compiler support for offloading C++11
3682 destructor calls to glibc.
3684 * Improved worst case performance of libm functions with double inputs and
3687 * Support for priority inherited mutexes in pthread condition variables on
3688 non-x86 architectures.
3690 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
3692 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
3694 * Optimized string functions for ARM. Implemented by Will Newton and
3697 * Optimized libm functions for SPARC. Implemented by David S. Miller.
3699 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
3702 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
3703 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
3705 * Added a benchmark framework to track performance of functions in glibc.
3707 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
3708 It is based on draft TS 18661 and currently enabled as a GNU extension.
3710 * On Linux, the clock function now uses the clock_gettime system call
3711 for improved precision, rather than old times system call.
3713 * Added support for version-3 tz format files. This is needed when using
3714 the tz database release 2013e or later, and affects a few unusual cases --
3715 currently only TZ='America/Godthab' for time stamps after 2037.
3717 * Added new API functions pthread_getattr_default_np and
3718 pthread_setattr_default_np to get and set the default pthread
3719 attributes of a process.
3721 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
3722 This may improve lock scaling of existing programs on TSX capable systems.
3723 When the --enable-lock-elision=yes parameter is specified at configure
3724 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
3727 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
3728 availability). Implemented by Ryan S. Arnold.
3730 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
3734 * The following bugs are resolved with this release:
3736 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
3737 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
3738 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
3739 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
3740 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
3741 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
3742 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
3743 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
3744 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
3745 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
3746 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
3747 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
3748 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
3749 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
3750 14879, 14889, 14893, 14898, 14914.
3752 * Optimization of memcpy for MIPS.
3754 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
3755 EMFILE has been fixed (Bugzilla #14889).
3757 * The add-on ports collection is now distributed in the "ports" subdirectory
3758 of the main GNU C Library distribution, rather than separately.
3760 * Port to ARM AArch64 contributed by Linaro.
3762 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
3763 Optimized versions of memcpy, memset, and memcmp added for System z10 and
3765 Implemented by Andreas Krebbel.
3767 * The new function secure_getenv allows secure access to the environment,
3768 returning NULL if running in a SUID/SGID process. This function replaces
3769 the internal function __secure_getenv.
3771 * SystemTap static probes have been added into the dynamic linker.
3772 Implemented by Gary Benson.
3774 * Optimizations of string functions strstr, strcasestr and memmem.
3775 Implemented by Maxim Kuvyrkov.
3777 * The minimum Linux kernel version that this version of the GNU C Library
3778 can be used with is 2.6.16.
3780 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
3781 powerpc POWER7. Implemented by Will Schmidt.
3783 * New configure option --disable-nscd builds the C library such that it
3784 never attempts to contact the Name Service Caching Daemon (nscd).
3785 New configure option --disable-build-nscd avoids building nscd itself;
3786 this is the default if --disable-nscd is used.
3788 * Improved support for cross-compilation, including cross-testing and
3789 bootstrap builds without a previously built glibc.
3791 * Several testsuite tests are now able to test multiple IFUNC variants of an
3792 interface, rather than just testing the one that would be chooen by
3795 * New configure options --with-bugurl and --with-pkgversion, for
3796 distributors to use to embed their bug-reporting and package version
3797 information in --help and --version output.
3799 * The ttyname and ttyname_r functions on Linux now fall back to searching for
3800 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
3801 allows creation of chroots without the procfs mounted on /proc.
3803 * The `crypt' function now fails if passed salt bytes that violate the
3804 specification for those values. On Linux, the `crypt' function will
3805 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
3806 enabled, and fail on encrypted strings using the MD5 or DES algorithm
3807 when the mode is enabled.
3809 * The `clock_*' suite of functions (declared in <time.h>) is now available
3810 directly in the main C library. Previously it was necessary to link with
3811 -lrt to use these functions. This change has the effect that a
3812 single-threaded program that uses a function such as `clock_gettime' (and
3813 is not linked with -lrt) will no longer implicitly load the pthreads
3814 library at runtime and so will not suffer the overheads associated with
3815 multi-thread support in other code such as the C++ runtime library.
3817 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
3822 * The following bugs are resolved with this release:
3824 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
3825 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
3826 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
3827 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
3828 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
3829 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
3830 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
3831 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
3832 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
3833 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
3834 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
3835 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
3836 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
3837 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
3838 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
3839 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
3840 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
3841 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
3842 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
3843 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
3844 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
3845 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
3848 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
3849 configuring glibc with:
3850 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
3851 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
3852 Implemented by H.J. Lu.
3856 + define static_assert
3858 + do not declare gets
3860 + declare at_quick_exit and quick_exit also for ISO C11
3862 + aligned_alloc. NB: The code is deliberately allows the size parameter
3863 to not be a multiple of the alignment. This is a moronic requirement
3864 in the standard but it is only a requirement on the caller, not the
3867 + timespec_get added
3869 + uchar.h support added
3871 + CMPLX, CMPLXF, CMPLXL added
3873 Implemented by Ulrich Drepper.
3875 * Support for the IA-64 has been moved to ports.
3877 * Remove support for anything but ELF binary format
3879 * Checking versions of poll, ppoll added.
3880 Implemented by Ulrich Drepper.
3882 * More generic and 64-bit performance optimizations to math functions.
3883 Implemented by Ulrich Drepper.
3885 * New configure option --enable-obsolete-rpc makes the deprecated RPC
3886 headers and functions available at compile time as they were before
3887 version 2.14. This option will be removed at some time in the future
3888 after the TI-RPC library becomes fully sufficient for the needs of
3889 existing applications.
3891 * Compatibility code for Linux kernel versions before 2.4 has been removed.
3892 Note that glibc is not expected to work with any Linux kernel version
3895 * New header <sys/auxv.h> and function getauxval allowing easy access to
3896 the AT_* key-value pairs passed from the Linux kernel. The header also
3897 defines the HWCAP_* bits associated with the AT_HWCAP key.
3899 * New locales: mag_IN
3901 * New configure option --enable-systemtap builds SystemTap static probes
3902 into libc for setjmp and longjmp and into libpthread for various operations.
3903 So far the setjmp/longjmp probes and some of the libpthread probes are
3904 provided only for i*86 and x86_64.
3905 Implemented by Roland McGrath and Rayson Ho.
3907 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
3909 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
3912 * More optimized functions for SPARC. Implemented by David S. Miller.
3914 * Improved support for cross-compilation, especially bootstrap builds
3915 without a previously built glibc.
3917 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
3918 Chris Metcalf from Tilera.
3920 * Support for the old ARM ABI has been removed from ports. Only the EABI is
3921 now supported for ARM processors.
3923 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
3924 as the name of the dynamic linker, to distinguish it from the
3925 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
3927 * Support for CRIS has been removed from ports.
3929 * A new class of installed header has been documented for low-level
3930 platform-specific functionality. PowerPC added the first instance with a
3931 function to provide time base register access. Contributed by Tulio
3932 Magno Quites Machado Filho.
3934 * ix86 configurations now install header files that are consistent with
3935 what x86-64 configurations install. These same header files can be used
3936 for -m32, -m64, or -mx32 builds.
3937 Contributed by H.J. Lu.
3939 * Math library bug fixes. A thorough audit of all open math library bugs was
3940 conducted by Joseph Myers. Significant progress was made on many math
3941 library bugs resulting in more accurate exceptions and function results.
3942 Many thanks to all those that contributed including Andreas Jaeger for his
3943 patch review and work on the x87 trigonometric instruction issues.
3945 * Timezone data is no longer installed. Timezone-related binaries and scripts
3946 will continue to be installed. Users should obtain their timezone data from
3947 their distribution provider or from the tzdata package at
3948 <ftp://munnari.oz.au/pub/>.
3952 * The following bugs are resolved with this release:
3954 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
3955 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
3956 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
3957 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
3958 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
3959 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
3960 13484, 13506, 13515, 13523, 13524, 13538, 13540
3962 * New program pldd to list loaded object of a process
3963 Implemented by Ulrich Drepper.
3965 * Add nss_db support back to glibc. No more dependency on Berkeley db
3966 and support for initgroups lookups.
3967 Implemented by Ulrich Drepper.
3969 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
3970 Contributed by HJ Lu.
3972 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
3973 Contributed by HJ Lu.
3975 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
3976 on x86-32 and x86-64.
3977 Contributed by Liubov Dmitrieva.
3979 * Optimized strchr and strrchr for SSE on x86-32.
3980 Contributed by Liubov Dmitrieva.
3982 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
3983 for x86-64 and x86-32.
3984 Contributed by Liubov Dmitrieva.
3986 * New interfaces: scandirat, scandirat64
3987 Implemented by Ulrich Drepper.
3989 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
3990 Implemented by Ulrich Drepper.
3992 * nscd now also caches the netgroup database.
3993 Implemented by Ulrich Drepper.
3995 * Integrate libm with gcc's -ffinite-math-only option.
3996 Implemented by Ulrich Drepper.
3998 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
3999 to math functions. Implemented by Ulrich Drepper.
4001 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4002 Implemented by Ulrich Drepper.
4004 * New Linux interfaces: process_vm_readv, process_vm_writev
4006 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4007 Implemented by Ulrich Drepper.
4009 * Optimized nearbyint and strcasecmp for PPC.
4010 Implemented by Adhemerval Zanella.
4012 * New locales: bho_IN, unm_US, es_CU, ta_LK
4016 * The following bugs are resolved with this release:
4018 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4019 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4020 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4021 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4022 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4023 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4024 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4025 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4026 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4027 12795, 12811, 12813, 12814, 12841
4029 * The RPC implementation in libc is obsoleted. Old programs keep working
4030 but new programs cannot be linked with the routines in libc anymore.
4031 Programs in need of RPC functionality must be linked against TI-RPC.
4032 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4034 Visible changes of this change include (obviously) the inability to link
4035 programs using RPC functions without referencing the TI-RPC library and the
4036 removal of the RPC headers from the glibc headers.
4037 Implemented by Ulrich Drepper.
4039 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4040 syncfs, setns, sendmmsg
4042 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4043 yue_HK, lij_IT, mhr_RU
4045 * New encodings: CP770, CP771, CP772, CP773, CP774
4047 * New program sotruss to trace calls through PLTs
4048 Implemented by Ulrich Drepper.
4050 * The malloc hook implementation is marked deprecated and will be removed
4051 from the default implementation in the next version. The design never
4052 worked ever since the introduction of threads. Even programs which do
4053 not create threads themselves can use multiple threads created internally.
4057 * The following bugs are resolved with this release:
4059 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4060 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4061 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4062 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4065 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4067 * POWER7 optimizations: memset, memcmp, strncmp
4069 * New optimized string functions for x86-64: strnlen (SSE2),
4070 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4071 Implemented by Ulrich Drepper.
4075 * The following bugs are resolved with this release:
4077 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4078 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4079 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4080 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4081 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4082 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4083 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4084 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4086 * New interfaces: pthread_getname_np, pthread_setname_np
4088 * New Linux interface: recvmmsg
4090 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4092 * The dynamic linker now recognizes supported ABI versions from the
4093 EI_ABIVERSION field in the ELF header.
4094 Implemented by Ulrich Drepper.
4096 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4097 will not be used to fill in password fields in the passwd.byname replies.
4098 Instead it is used to synthesize the shadow.byname table, should it be
4099 missing. This is a useful mode in some installations involving Solaris.
4100 Implemented by Ulrich Drepper.
4102 * New locales: kok_IN, sq_MK, cv_RU
4106 * The following bugs are resolved with this release:
4108 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4109 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4110 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4111 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4112 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4113 10789, 10817, 10823, 10840, 10847
4115 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4117 Implemented by Ulrich Drepper.
4119 * Checking version of longjmp added that fails if an uninitialized stack
4120 frame would be created. Implemented by Ulrich Drepper.
4122 * STT_GNU_IFUNC is now supported in static executables.
4123 Implemented by H.J. Lu.
4125 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4127 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4128 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4129 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4130 Contributed by H.J. Lu.
4132 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4133 Implemented by Ulrich Drepper.
4135 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4137 Contributed by H.J. Lu.
4139 * Support for fma instruction in AVX on x86-64.
4140 Implemented by H.J. Lu and Ulrich Drepper.
4142 * AVX support in x86-64 auditing support in ld.so.
4143 Implemented by H.J. Lu.
4145 * STB_GNU_UNIQUE support added.
4146 Implemented by Ulrich Drepper.
4148 * Implement second fallback mode for optimized DNS lookup for even more
4149 broken environments. If two requests from the same port are not
4150 handled correctly close the socket and open a new one before sending
4151 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4152 can be used to select this mode right away, instead of rediscovering the
4153 necessity is every process again.
4154 Implemented by Ulrich Drepper.
4156 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4157 Implemented by Adam Tkac.
4159 * Optimized iconv conversions for S390x.
4160 Implemented by Andreas Krebbel.
4162 * Using condvars with PI mutexes is now more efficient due to kernel
4163 support for requeueing to PI futexes. NPTL support added for x86-64.
4164 Implemented by Ulrich Drepper.
4166 * New locales: ps_AF, my_MM
4170 * The following bugs are resolved with this release:
4172 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4173 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4174 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4175 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4176 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4178 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4179 Implemented by Ulrich Drepper.
4181 * New Linux interfaces: accept4, fallocate, fallocate64.
4182 Implemented by Ulrich Drepper.
4184 * Correct declarations of string function when used in C++ code. This
4185 could lead to compile errors for invalid C++ code.
4187 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4190 * New POSIX 2008 interface: psiginfo
4191 Implemented by Ulrich Drepper.
4193 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4194 Implemented by Ulrich Drepper.
4196 * Support for selecting between multiple function definitions at runtime
4197 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4199 * The libcrypt library can now use the hash function implementations in
4200 NSS. Implemented by Ulrich Drepper.
4202 * The malloc implementation can be compiled to be less memory efficient
4203 but higher performing in multi-threaded programs.
4204 Implemented by Ulrich Drepper.
4206 * New locales: nan_TW@latin, ks_IN
4208 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4209 Implemented by Ulrich Drepper.
4211 * Extended printf hook support. It is possible to use user-defined types
4212 and extend existing format specifiers.
4213 Implemented by Ulrich Drepper.
4215 * Handling for group shadow files has been added.
4216 Implemented by Ulrich Drepper.
4218 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4219 servers (the case, e.g., for some people using the built-in DNS
4220 server in ADSL modems/routers). There is a once-per-process timeout
4221 in case of a broken server. To avoid it, users can run nscd or put
4222 'options single-request' in /etc/resolv.conf.
4223 Implemented by Ulrich Drepper.
4227 * The following bugs are resolved with this release:
4229 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
4230 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
4231 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
4232 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
4233 6968, 6974, 6980, 6995, 7008, 7009, 7029
4235 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4236 up at the same time. Implemented by Ulrich Drepper.
4238 * TLS descriptors for LD and GD on x86 and x86-64.
4239 Implemented by Alexandre Oliva.
4241 * getaddrinfo now handles DCCP and UDPlite.
4242 Implemented by Ulrich Drepper.
4244 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4245 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4246 Implemented by Ulrich Drepper.
4248 * New implementation of memmem, strstr, and strcasestr which is O(n).
4249 Implemented by Eric Blake.
4251 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4253 * Implement "e" option for popen to open file descriptor with the
4254 close-on-exec flag set. Implemented by Ulrich Drepper.
4256 * Implement "b" mode for fmemopen. In this mode writes writes don't
4257 implicitly add a NUL byte and seeks from the end of the buffer really
4258 use the buffer end, not the string length as the basis.
4259 Implemented by Ulrich Drepper.
4261 * Many functions, exported and internal, now atomically set the close-on-exec
4262 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4264 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4266 Implemented by Pravin Satpute.
4268 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4272 * The following bugs are resolved with this release:
4274 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4275 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4276 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4277 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4278 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4279 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4280 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4282 * New locales: bo_CN, bo_IN, shs_CA.
4284 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4286 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4287 Implemented by Pravin Satpute.
4289 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4291 * nscd caches now all timeouts for DNS entries
4292 Implemented by Ulrich Drepper.
4294 * nscd is more efficient and wakes up less often.
4295 Implemented by Ulrich Drepper.
4297 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4298 vdprintf, and obstack_vprintf.
4299 Implemented by Jakub Jelinek.
4301 * Faster memset for x86-64.
4302 Implemented by Harsha Jagasia and H.J. Lu.
4304 * Faster memcpy on x86.
4305 Implemented by Ulrich Drepper.
4307 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4308 Implemented by Ulrich Drepper.
4310 * Faster sqrt and sqrtf implemention for some PPC variants.
4311 Implemented by Steven Munroe.
4315 * The following bugs are resolved with this release:
4317 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4318 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4319 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4320 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4321 5071, 5103, 5104, 5112, 5113, 5184, 5186
4323 * More checking functions: fread, fread_unlocked, open*, mq_open.
4324 Implemented by Jakub Jelinek and Ulrich Drepper.
4326 * Extend fortification to C++. Implemented by Jakub Jelinek.
4328 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4329 by not recognizing 'a' as a modifier when those specs are requested.
4330 Implemented by Jakub Jelinek.
4332 * PPC optimizations to math and string functions.
4333 Implemented by Steven Munroe.
4335 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4336 options to be passed. Implemented by Ulrich Drepper.
4338 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4340 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4341 Implemented by Ulrich Drepper.
4343 * Handle private futexes in the NPTL implementation.
4344 Implemented by Jakub Jelinek and Ulrich Drepper.
4346 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4347 Implemented by Roland McGrath and Ulrich Drepper.
4349 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4351 * SHA-256 and SHA-512 based password encryption.
4352 Implemented by Ulrich Drepper.
4354 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4355 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4358 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4359 Implemented by Ulrich Drepper.
4363 * The following bugs are resolved with this release:
4365 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4366 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4367 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4368 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4369 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4370 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4371 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4374 * New Linux interfaces: epoll_pwait, sched_getcpu.
4376 * New generic interfaces: strerror_l.
4378 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4382 * The following bugs are resolved with this release:
4384 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4385 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4386 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4387 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4388 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4389 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4390 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4391 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4392 3225, 3251, 3252, 3253, 3273
4394 * For Linux, the sorting of addresses returned by getaddrinfo now also
4395 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4396 Implemented by Ulrich Drepper.
4398 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4399 Implemented by Ulrich Drepper.
4401 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4403 * New iconv module for MIK. Contributed by Alexander Shopov.
4405 * For sites with broken group and/or passwd database, the auto-propagate
4406 option of nscd can prevent creating ID lookup entries from the results
4407 of a name lookup and vice versa. This usually is no problem but some
4408 site might have problems with the default behavior.
4409 Implemented by Ulrich Drepper.
4411 * Iterating over entire database in NIS can be slow. With the
4412 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4413 to trade time for memory. The entire database will be read at once.
4414 Implemented by Ulrich Drepper.
4416 * The interfaces introduced in RFC 3542 have been implemented by
4419 * Support for the new ELF hash table format was added by Ulrich Drepper.
4421 * Support for priority inheritance mutexes added by Jakub Jelinek and
4424 * Support for priority protected mutexes added by Jakub Jelinek.
4426 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4427 or_IN, csb_PL, fy_NL, sr_ME.
4431 * More overflow detection functions.
4433 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4434 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4436 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4437 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4438 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4439 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4440 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4441 by Masahide Washizawa.
4443 * It is now possible to install audit libraries for the dynamic linker using
4444 LD_AUDIT. Implemented by Ulrich Drepper.
4446 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4447 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4448 For a libc and libpthread that works well on Linux 2.4 kernels, we
4449 recommend using the stable 2.3 branch.
4451 * The new function open_wmemstream acts like open_memstream,
4452 but uses a wchar_t wide character buffer.
4454 * The new function ppoll is an improved version of poll, similar to pselect.
4456 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4457 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4458 renameat, unlinkat, linkat, symlinkat, readlinkat.
4460 * New Linux kernel system calls: unshare,
4461 inotify_init, inotify_add_watch, inotify_rm_watch.
4463 * The euidaccess function is now also known by the alias eaccess,
4464 for compatibility with some other systems.
4466 * Timezone data updated to 2006b version.
4470 * The following bugs are resolved with this release:
4472 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4473 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4474 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4475 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4476 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4477 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4479 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4481 * As of this release, GCC 4 can be used to compile the C Library.
4483 * Timezone data updated to 2005m version.
4487 * The following bugs are resolved with this release:
4489 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4490 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4491 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4492 777, 787, 821, 822, 823, 825
4494 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4498 * Support for RFC 3678. Real implementations exist only for Linux so far.
4499 Implemented by Ulrich Drepper.
4501 * nscd can now cache entries persistently. Expiring entries are reloaded.
4502 For speedups the cache can be shared in memory with client processes.
4503 Implemented by Ulrich Drepper.
4505 * nscd can now perform SELinux checks.
4506 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4508 * getaddrinfo queries are now cached. Canonical name lookup is performed
4510 Implemented by Ulrich Drepper.
4512 * The nothrow function attribute is used when headers are used by gcc when
4513 compiling C code. This can avoid significant amounts of exception
4516 * The malloc functions perform more error checking and are stricter when
4517 it comes to reacting on errors. The default action is to terminate
4518 the process after showing an error message. Implemented by Ulrich Drepper.
4520 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4521 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
4523 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
4524 namespaces using the new function dlmopen(). This feature is of course,
4525 like most other dynamic loading functionality, not available in statically
4526 linked applications. Implemented by Ulrich Drepper.
4528 * Low-overhead boundary checking variants of string and some stdio functions
4529 were added. These are to be used in conjunction with a gcc patch by
4530 Jakub Jelinek which adds calls to these functions if possible.
4531 Implemented by Jakub Jelinek and Ulrich Drepper.
4533 * Old code for several operating systems and machine architectures that
4534 have not been in working condition in a long time have been removed from
4535 the main source tree maintained by the GNU C Library's maintainers.
4536 These files are now reside in the separate `ports' source module
4537 that is usable as an add-on when building the library.
4541 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4542 interrogate the dynamic linker, compatible with the Solaris interface.
4544 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4545 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4547 * getifaddrs now uses the netlink interface on Linux to get its information.
4548 Implemented by Thorsten Kukuk.
4550 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4551 Implemented by Ulrich Drepper.
4553 * support for non-executable stacks on x86 has been added. Changes mostly
4556 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
4559 * getaddrinfo now performs destination address selection according to
4564 * Thread-safe interfaces for many functions that access locale data
4565 were added in version 2.3, but these features were omitted from NEWS.
4566 Many functions have variants with an `_l' suffix that take a `locale_t'
4567 object as a parameter rather than consulting the current locale.
4568 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4569 create and maintain `locale_t' objects. Additionally, the new function
4570 `uselocale' sets "the current locale" (as used by functions not so
4571 parameterized) set for an individual thread. These features were added
4572 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4574 * The functions getresuid, getresgid, setresuid, and setresgid, which
4575 have long been available on Linux, are now declared in <unistd.h>
4576 and are now also available on the Hurd.
4578 * ELF thread-local storage support (TLS) now works on x86-64.
4580 * The new dynamic string token $LIB is expanded in shared library names.
4581 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4583 * Aldy Hernandez contributed complete software floating point support for
4584 PowerPC machines with no FPU.
4586 * fexecve is implemented on Linux.
4588 * The `btowc' function should work at least twice as fast due to
4589 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
4591 * With approriate thread add-ons cancelable functions are now implemented
4592 in libc.so as well. No need to call the function in libpthread. This
4593 change allowed to finally disable the incorrect and expensive handling
4594 of weak definition in ld.so.
4596 * Yet more PLT entries in libc.so have been removed. We finally arrived
4597 at the bare minimum. Startup times improved appropriately.
4599 * Support for the new Linux/x86 system call interface was added. The
4600 AT_SYSINFO auxiliary vector entry is recognized and handled.
4604 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4607 * iconv (the program and the interface) now accepts empty names (excluding
4608 options like //TRANSLIT) to mean "use charset of current locale".
4610 * localedef can now transliterate characters in strings which are not in
4611 the provided charmap. The information from the input locale is used.
4613 * Prelinking support was added for ELF targets. This requires additional
4614 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
4616 * Read-only stdio streams now use mmap to speed up operation by eliminating
4617 copying and buffer underflows. To use add 'm' to the mode string of
4618 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
4620 * The malloc functions were completely rewritten by Wolfram Gloger based
4621 on Doug Lea's malloc-2.7.0.c.
4623 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4624 implementation of regex.
4626 * Bruno Haible upgraded the iconv and locale implementation to support
4629 * Contents of the LC_* and LANG environment variables in the CEN style are
4630 not recognized anymore. It never was used. Change by Ulrich Drepper.
4632 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4633 thread-local storage (TLS) ABI on some platforms.
4634 Changes by Ulrich Drepper. SH support by Kaz Kojima.
4636 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4637 EUC-JISX0213, and TSCII.
4639 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4640 BSD-compatible interface for getting all network interface addresses.
4641 Implementation for IPv4 by Roland McGrath.
4643 * Loading of locale data is faster due to the introduction of a locale
4644 archive. Implemented by Roland McGrath and Ulrich Drepper.
4646 * Startup times are significantly reduced by not using exported functions
4647 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
4650 * Steven Munroe contributed a port to PowerPC64/Linux.
4654 * The Hurd now uses the GNU libio implementation of stdio rather than the
4655 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4657 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4658 with the same behavior as the Linux system call of the same name.
4662 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4663 128-bit long double format.
4665 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4666 IBM1161, and IBM1162 charsets.
4668 * Andreas Jaeger contributed a port to x86-64/Linux.
4670 * Peter Bruin contributed a port to PowerPC/Hurd.
4672 * libc functions using I/O streams now can handle wide-oriented streams
4675 * optimizations in the dynamic linker. Binaries created by recent binutils
4676 versions start up quicker due to reduced time spent on relocations.
4678 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
4682 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
4683 asinh, atanh, j0 for the 128-bit long double format.
4685 * Bruno Haible updated all the code handling Unicode in some form to
4686 support Unicode 3.1.
4688 * Speed of regex for single-byte locales is back to previous levels.
4689 Patch by Isamu Hasegawa.
4691 * Alpha, SPARC, and IA-64 now also using floating stacks.
4693 * Startup time of internationalized applications greatly improved through
4694 iconv cache. Use iconvconfig to generate the cache file.
4695 Contributed by Ulrich Drepper.
4697 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
4698 severe performance problems. Patch by David Mosberger.
4700 * The Hurd port got a lot more functionality like AIO, various stdio
4701 extensions, etc. Mainly done by Roland McGrath.
4703 * mtrace can now lookup symbols in shared libraries.
4707 * Intel's IA-64 math library is largely integrated. It provides fast and
4708 accurate implementatations for most basic and standard math functions
4709 in float, double, and long double format.
4711 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
4712 and asin for the 96-bit long double format and asin, log, tan for the
4713 128-bit long double format.
4715 * The beginning of a last-bit accurate math library by IBM Haifa were added.
4716 The basic double functions exist today. Contributed by Abraham Ziv
4717 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
4718 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
4720 * An asynchronous name lookup library was added. The interface is designed
4721 after POSIX AIO. The proposal was circulated beforehand to get comments.
4722 No negative ones came in. Implemented by Ulrich Drepper.
4724 * Port to S390/64bit contributed by Martin Schwidefsky
4725 <schwidefsky@de.ibm.com>.
4727 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
4728 of functions for Linux/IA-64.
4730 * The RPC code is now thread safe. Threads can now use the same service
4731 of different services at the same time. Patch by Eric Norum
4732 <eric.norum@usask.ca> with some help by Ulrich Drepper.
4734 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
4735 family of functions for Linux/S390.
4737 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
4738 of functions for Linux/x86.
4740 * Port to Linux/CRIS contributed by Axis Communications.
4744 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
4745 we can now check for namespace violations and missing declarations. The
4746 result is that almost all headers are now Unix-compliant (as defined in
4747 the upcoming XPG6). The negative side is that some programs might need
4748 corrections, too, if they depend on the incorrect form of the headers in
4749 previous versions which defined too many symbols and included too many
4752 * regex now handles multibyte character sets correctly.
4753 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
4755 * iconv (the program) does now conform to the upcoming XPG6 and handles
4756 charmaps. Instead of the charset names the path of charmaps can be
4757 provided and the conversion happens based on this data.
4758 Contributed by Ulrich Drepper.
4760 * The locale program now provides detailed information about the installed
4765 only lists the names of the supported locales
4769 provides details such as country, language, and codeset name.
4770 Contributed by Ulrich Drepper.
4774 * The gencat program now parses the input file according to the charset
4775 selected by the LC_CTYPE category. This is important for stateful
4776 character sets. To make generating catalogs easier there is a way
4777 to overwrite the charset selected by the locale: before the first
4778 message or $ quote line the catalog can contain a line like
4780 $ codeset=ISO-8859-2
4782 to select the charset (ISO-8859-2 in this case).
4784 Implemented by Shinya Hanataka and Ulrich Drepper.
4786 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
4787 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
4788 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
4790 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
4791 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
4793 * The LANGUAGE environment variable is now ignored unless the locale is
4794 changed from the default "C" locale.
4796 * The usual bug fixes.
4800 * Greg McGary added runtime support for bounds checking using gcc's
4801 new -fbounded-pointers option. ix86 target is complete. PowerPC
4804 * Thorsten Kukuk added secure mode support to nscd.
4806 * The Berkeley db libraries have been removed.
4808 Related, the nss_db module is now in a separate package since it
4809 obviously requires a database library being available.
4811 * Wide character I/O streams implemented by Ulrich Drepper.
4813 * Functions from the extended socket API added by Ulrich Drepper.
4815 * Functions feenableexcept and fedisableexcept to control the
4816 behaviour of individual exceptions have been added by Andreas Jaeger.
4818 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
4820 * The resolver code has been updated from bind 8.2.3-T5B which supports
4821 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
4824 This change could in some situations effect backward compatibility. Since
4825 now `_res' is a thread-local instead of a global variable, modifying it
4826 in one thread does not have any effect in other threads.
4828 The resolver library was also extended to allow IPv6 as the transport
4829 protocol for the requests. This work was done by Stig Venaas.
4831 * Compatibility code for K&R C compilers has been removed from the
4832 header files. A ISO C compiler is needed to use the library
4833 (conforming to either C89 or C99 standard).
4835 * Complete rewrite of the localedef program to support multibyte character
4836 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
4837 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
4838 Implemented by Ulrich Drepper.
4840 Bruno Haible significantly improved the generation and use of the data
4841 structures for the wide character tables.
4843 * Plural handling in gettext implemented by Ulrich Drepper.
4845 * The utmp daemon has been removed.
4847 * The port to MIPS-Linux has been finished by Andreas Jaeger.
4849 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
4852 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
4854 * POSIX barriers implemented by Kaz Kylheku.
4856 * POSIX spawn function family implemented by Ulrich Drepper.
4858 * POSIX spinlocks are now available.
4860 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
4862 * the configure option --enable-kernel=X.Y.Z allows to strip out
4863 compatibility for kernel versions before X.Y.Z. This is currently only
4864 implemented for Linux.
4866 * the sockaddr_in6 structure changed. The IPv6 working group added a new
4867 field sin6_scope_id. This means that all programs using IPv6 should be
4868 recompiled. Don't expect binary compatibility with previous glibc
4871 * various conversion modules for IBM character sets contributed by
4874 * IA-64 port by Jes Sorensen and HJ Lu.
4888 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
4890 * New xdr functions are added; some rpc functions are now 64bit clean.
4892 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
4894 * Fixed known incompatibilities with glibc 2.0.
4896 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
4898 * Optimized a number of functions (especially the ELF dynamic loader).
4900 * Update timezone data files.
4902 * lots of charmaps corrections
4904 * some new locale definitions and charmaps
4909 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
4910 conform to POSIX member type requirements. Symbol versions have been
4911 adjusted as needed within the library, and for direct use by applications,
4912 but there is potential for problems if third-party libraries use
4913 struct timeval as part of their interface. This does not present
4914 a problem for X and other "essential" system libraries.
4916 * An additional locale model to support C++ Standard Library locale
4917 model and probably more was implemented by Ulrich Drepper.
4919 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
4922 * Miles Bader provided the `argp' function family to support hierachical
4923 command line argument parsing, layered on top of getopt.
4925 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
4927 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
4930 * scanf recognizes the %a and %A format for scanning floating point numbers.
4932 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
4933 information and interfaces for the available integer types.
4935 * about 130 new math functions were added to implement the ISO C9x math
4938 * the new header <complex.h> contains definitions of the complex math
4939 functions from ISO C 9X.
4941 * the new header <tgmath.h> defines generic macros to use complex or
4942 real valued functions.
4944 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
4946 * Andreas Jaeger provided a test suite for the math library.
4948 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
4950 * Ulrich Drepper added character set conversion functions (iconv).
4952 * Optimized string functions have been added.
4954 * The localedata addon is now part of glibc.
4956 * An implementation of profiling shared libraries was added by Ulrich Drepper.
4958 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
4959 daemon for NSS (nscd).
4961 Missing a better place here are some numbers on improvements. Under
4962 Linux 2.1.125 un-tar-ing the kernel sources takes
4966 using local files 12.19s 6.88s 22.91s
4968 using NIS 13.92s 8.91s 26.34s
4970 using NIS & nscd 10.37s 7.34s 25.30s
4972 using NIS+ 27.57s 30.37s 640.46s
4974 using NIS+ & nscd 10.25s 7.83s 26.51s
4976 using NIS & old nscd [1] 13.83s 8.32s 29.60s
4978 Keep in mind that non-namelookup related operations dominate above times.
4979 It was just a common complain that using NIS+ unpacking the kernel is
4982 [1] The old nscd implementation is not available anymore since it was
4983 distributed with glibc up to version 2.0.98 and thus is now replaced.
4985 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
4987 * Mark Kettenis provided a Hesiod NSS module.
4989 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
4990 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
4992 * rcmd can now handle netgroups (Dick Streefland).
4994 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
4997 * Support for the IPv6 protocol has been added to the socket API, as per the
4998 latest draft standards.
5000 * Support for Linux 2.2 has been added.
5002 * Interface changes relative to the latest 2.0.x release:
5003 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5004 addseverity NEW: Unix98
5005 alphasort64 NEW: LFS
5006 argp_err_exit_status NEW: argp, GNU ext
5007 argp_error NEW: argp, GNU ext
5008 argp_failure NEW: argp, GNU ext
5009 argp_help NEW: argp, GNU ext
5010 argp_parse NEW: argp, GNU ext
5011 argp_program_bug_address NEW: argp, GNU ext
5012 argp_program_version NEW: argp, GNU ext
5013 argp_program_version_hook NEW: argp, GNU ext
5014 argp_state_help NEW: argp, GNU ext
5015 argp_usage NEW: argp, GNU ext
5016 authdes_create NEW: Secure RPC
5017 authdes_getucred NEW: Secure RPC
5018 authdes_pk_create NEW: Secure RPC
5019 backtrace NEW: GNU ext.
5020 backtrace_symbols NEW: GNU ext.
5021 backtrace_symbols_fd NEW: GNU ext.
5023 cacosf NEW: ISO C 9x
5024 cacosh NEW: ISO C 9x
5025 cacoshf NEW: ISO C 9x
5026 cacoshl NEW: ISO C 9x
5027 cacosl NEW: ISO C 9x
5034 casinf NEW: ISO C 9x
5035 casinh NEW: ISO C 9x
5036 casinhf NEW: ISO C 9x
5037 casinhl NEW: ISO C 9x
5038 casinl NEW: ISO C 9x
5040 catanf NEW: ISO C 9x
5041 catanh NEW: ISO C 9x
5042 catanhf NEW: ISO C 9x
5043 catanhl NEW: ISO C 9x
5044 catanl NEW: ISO C 9x
5045 cbc_crypt NEW: Secure RPC
5049 ccoshf NEW: ISO C 9x
5050 ccoshl NEW: ISO C 9x
5056 cimagf NEW: ISO C 9x
5057 cimagl NEW: ISO C 9x
5058 clearerr_locked REMOVED
5059 clntunix_create NEW: sunrpc ext
5061 clog10 NEW: ISO C 9x
5062 clog10f NEW: ISO C 9x
5063 clog10l NEW: ISO C 9x
5073 cprojf NEW: ISO C 9x
5074 cprojl NEW: ISO C 9x
5076 crealf NEW: ISO C 9x
5077 creall NEW: ISO C 9x
5082 csinhf NEW: ISO C 9x
5083 csinhl NEW: ISO C 9x
5086 csqrtf NEW: ISO C 9x
5087 csqrtl NEW: ISO C 9x
5091 ctanhf NEW: ISO C 9x
5092 ctanhl NEW: ISO C 9x
5094 des_setparity NEW: Secure RPC
5095 ecb_crypt NEW: Secure RPC
5096 endutxent NEW: Unix98
5098 exp10f NEW: ISO C 9x
5099 exp10l NEW: ISO C 9x
5103 fattach NEW: STREAMS
5104 fdetach NEW: STREAMS
5108 feclearexcept NEW: ISO C 9x
5109 fegetenv NEW: ISO C 9x
5110 fegetexceptflag NEW: ISO C 9x
5111 fegetround NEW: ISO C 9x
5112 feholdexcept NEW: ISO C 9x
5114 feraiseexcept NEW: ISO C 9x
5115 ferror_locked REMOVED
5116 fesetenv NEW: ISO C 9x
5117 fesetexceptflag NEW: ISO C 9x
5118 fesetround NEW: ISO C 9x
5119 fetestexcept NEW: ISO C 9x
5120 feupdateenv NEW: ISO C 9x
5121 fflush_locked REMOVED
5125 fgets_unlocked NEW: GNU ext.
5126 fileno_locked REMOVED
5138 fputc_locked REMOVED
5139 fputs_unlocked NEW: GNU ext.
5140 fread_unlocked NEW: GNU ext.
5145 fstatvfs NEW: Unix98
5149 ftruncate64 NEW: LFS
5151 fwrite_unlocked NEW: GNU ext.
5152 gai_strerror NEW: IPv6
5156 getchar_locked REMOVED
5158 getdate_err NEW: Unix98
5159 getdate_r NEW: GNU ext.
5161 getnameinfo NEW: IPv6
5162 getnetname NEW: Secure RPC
5163 getpmsg NEW: STREAMS
5164 getpt NEW: Unix98 PTY
5165 getrlimit64 NEW: LFS
5166 getutxent NEW: Unix98
5167 getutxid NEW: Unix98
5168 getutxline NEW: Unix98
5169 glob64 NEW: GNU ext.
5170 globfree64 NEW: GNU ext.
5171 gnu_get_libc_release NEW: GNU ext.
5172 gnu_get_libc_version NEW: GNU ext.
5173 grantpt NEW: Unix98 PTY
5174 host2netname NEW: Secure RPC
5176 iconv_close NEW: iconv
5177 iconv_open NEW: iconv
5178 if_freenameindex NEW: IPv6
5179 if_indextoname NEW: IPv6
5180 if_nameindex NEW: IPv6
5181 if_nametoindex NEW: IPv6
5182 in6addr_any NEW: IPv6
5183 in6addr_loopback NEW: IPv6
5184 inet6_isipv4mapped NEW: IPv6
5185 isastream NEW: STREAMS
5186 iswblank NEW: GNU ext.
5187 key_decryptsession NEW: Secure RPC
5188 key_decryptsession_pk NEW: Secure RPC
5189 key_encryptsession NEW: Secure RPC
5190 key_encryptsession_pk NEW: Secure RPC
5191 key_gendes NEW: Secure RPC
5192 key_get_conv NEW: Secure RPC
5193 key_secretkey_is_set NEW: Secure RPC
5194 key_setnet NEW: Secure RPC
5195 key_setsecret NEW: Secure RPC
5196 llrint NEW: ISO C 9x
5197 llrintf NEW: ISO C 9x
5198 llrintl NEW: ISO C 9x
5199 llround NEW: ISO C 9x
5200 llroundf NEW: ISO C 9x
5201 llroundl NEW: ISO C 9x
5206 lrintf NEW: ISO C 9x
5207 lrintl NEW: ISO C 9x
5208 lround NEW: ISO C 9x
5209 lroundf NEW: ISO C 9x
5210 lroundl NEW: ISO C 9x
5212 makecontext NEW: Unix98
5213 mempcpy NEW: GNU ext.
5216 modify_ldt NEW: kernel
5220 nearbyint NEW: ISO C 9x
5221 nearbyintf NEW: ISO C 9x
5222 nearbyintl NEW: ISO C 9x
5223 netname2host NEW: Secure RPC
5224 netname2user NEW: Secure RPC
5225 nexttoward NEW: ISO C 9x
5226 nexttowardf NEW: ISO C 9x
5227 nexttowardl NEW: ISO C 9x
5231 passwd2des NEW: Secure RPC
5233 pow10f NEW: GNU ext.
5234 pow10l NEW: GNU ext.
5237 printf_size NEW: GNU ext.
5238 printf_size_info NEW: GNU ext.
5239 profil_counter REMOVED
5240 pthread_mutexattr_getkind_np REPLACED
5241 pthread_mutexattr_setkind_np REPLACED
5242 ptsname NEW: Unix98 PTY
5243 ptsname_r NEW: Unix98 PTY
5245 putchar_locked REMOVED
5246 putgrent NEW: GNU ext.
5248 putpmsg NEW: STREAMS
5249 pututxline NEW: Unix98
5253 readdir64_r NEW: LFS
5254 remquo NEW: ISO C 9x
5255 remquof NEW: ISO C 9x
5256 remquol NEW: ISO C 9x
5258 roundf NEW: ISO C 9x
5259 roundl NEW: ISO C 9x
5261 scalbln NEW: ISO C 9x
5262 scalblnf NEW: ISO C 9x
5263 scalblnl NEW: ISO C 9x
5265 sendfile NEW: kernel
5266 setcontext NEW: Unix98
5267 setrlimit64 NEW: LFS
5268 setutxent NEW: Unix98
5270 sigignore NEW: Unix98
5271 sigqueue NEW: POSIX.1b
5272 sigrelse NEW: Unix98
5273 sigset NEW: POSIX.1b
5274 sigtimedwait NEW: POSIX.1b
5275 sigwaitinfo NEW: POSIX.1b
5276 sincos NEW: GNU ext.
5277 sincosf NEW: GNU ext.
5278 sincosl NEW: GNU ext.
5282 strcasestr NEW: GNU ext.
5283 strtoimax NEW: ISO C 9x
5284 strtoumax NEW: ISO C 9x
5285 strverscmp NEW: GNU ext.
5286 svcauthdes_stats NEW: Secure RPC
5287 svcunix_create NEW: sunrpc etx
5288 svcunixfd_create NEW: sunrpc ext
5289 swapcontext NEW: Unix98
5290 tcgetsid NEW: Unix98 PTY
5291 tdestroy NEW: GNU ext.
5292 tgamma NEW: ISO C 9x
5293 tgammaf NEW: ISO C 9x
5294 tgammal NEW: ISO C 9x
5298 truncf NEW: ISO C 9x
5299 truncl NEW: ISO C 9x
5301 unlockpt NEW: Unix98 PTY
5302 updwtmpx NEW: Unix98
5303 user2netname NEW: Secure RPC
5304 utmpxname NEW: Unix98
5305 versionsort NEW: GNU ext.
5306 versionsort64 NEW: GNU ext.
5308 wcscasecmp NEW: GNU ext.
5309 wcsncasecmp NEW: GNU ext.
5310 wcsnlen NEW: GNU ext.
5311 wcstoimax NEW: ISO C 9x
5312 wcstoll NEW: ISO C 9x
5313 wcstoull NEW: ISO C 9x
5314 wcstoumax NEW: ISO C 9x
5316 wordexp NEW: POSIX.2
5317 wordfree NEW: POSIX.2
5318 write_profiling REMOVED
5319 xdecrypt NEW: Secure RPC
5320 xdr_authdes_cred NEW: Secure RPC
5321 xdr_authdes_verf NEW: Secure RPC
5322 xdr_cryptkeyarg NEW: Secure RPC
5323 xdr_cryptkeyarg2 NEW: Secure RPC
5324 xdr_cryptkeyres NEW: Secure RPC
5325 xdr_getcredres NEW: Secure RPC
5326 xdr_key_netstarg NEW: Secure RPC
5327 xdr_key_netstres NEW: Secure RPC
5328 xdr_keybuf NEW: Secure RPC
5329 xdr_keystatus NEW: Secure RPC
5330 xdr_netnamestr NEW: Secure RPC
5331 xdr_sizeof NEW: Secure RPC
5332 xdr_unixcred NEW: sunrpc ext
5333 xencrypt NEW: Secure RPC
5334 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5345 * inet_ntoa is thread-safe
5347 * updwtmp is moved from libutil to libc
5349 * rewrite of cbrt function
5351 * update of timezone data
5365 * add atoll function
5367 * fix complex problems in Berkeley DB code
5369 * fix math functions
5373 * fixed lots of header problems (especially Linux/GNU specific)
5375 * dynamic loader preserves all registers
5377 * Roland McGrath provided support for handling of auxiliary objects in
5378 the ELF dynamic loader.
5380 * support for parallel builds is improved
5384 * GNU extensions are no longer declared by default. To enable them you
5385 must define the macro `_GNU_SOURCE' in your program or compile with
5388 * The library has changed from using GNU ld symbol aliases to using weak
5389 symbols where available. The ELF object file format supports weak
5390 symbols; GNU ld also supports weak symbols in the a.out format. (There
5391 is also now support for other GNU ld extensions in ELF. Use the
5392 `--with-elf' option to configure to indicate you have ELF, and
5393 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5394 of many files which contained only symbol aliases, reducing the size of
5395 the source and the compiled library; many other files were renamed to
5396 less cryptic names previously occupied by the symbol alias files.
5397 There is a new header file <elf.h> for programs which operate on
5398 files in the ELF format.
5400 * Converted to Autoconf version 2, so `configure' has more options.
5401 Run `configure --help' to see the details.
5403 * The library can now be configured to build profiling, highly-optimized
5404 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5405 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5406 `configure' enable building these extra libraries. The shared library is
5407 built by default when using both ELF and GNU ld. When shared libraries
5408 are enabled, the new library `-ldl' is available for arbitrary run-time
5409 loading of shared objects; its interface is defined in <dlfcn.h>. The
5410 new header file <link.h> gives access to the internals of the run-time
5411 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5412 application of same name on other systems and it provides information
5413 about dynamically linked binaries.
5415 * The C library now provides the run-time support code for profiling
5416 executables compiled with `-pg'. Programs can control the profiling code
5417 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5418 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5419 the support for this file format was contributed by David Mosberger-Tang.
5421 * The math code has been replaced with a math library based on fdlibm from
5422 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5423 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5424 functions. The math functions now reside in a separate library, so
5425 programs using them will need to use `-lm' their linking commands.
5427 * John C. Bowman contributed optimized ix87 assembler inline functions.
5429 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5430 mechanism similar to that found in Solaris 2. This is now used for the
5431 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5432 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5433 file controls what services are used for each individual database. This
5434 works by loading shared libraries with names specified in `nsswitch.conf',
5435 so service modules can be changed or added at any time without even
5436 relinking any program. Currently there are the file, db, and NIS based
5437 NSS services available.
5439 * The new functions `strtoq' and `strtouq' parse integer values from
5440 strings, like `strtol' and `strtoul', but they return `long long int' and
5441 `unsigned long long int' values, respectively (64-bit quantities).
5443 * The new functions `strtof' and `strtold' parse floating-point values from
5444 strings, like `strtod', but they return `float' and `long double' values,
5445 respectively (on some machines `double' and `long double' are the same).
5447 * Ulrich Drepper has contributed new implementations of the floating-point
5448 printing and reading code used in the `printf' family of functions and
5449 `strtod', `strtof', and `strtold'. These new functions are perfectly
5450 accurate, and much faster than the old ones.
5452 * The implementation of the POSIX locale model was completely rewritten by
5453 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5454 to compile the POSIX locale definition.
5456 * The former dummy implementations of the strcoll and strxfrm function are
5457 now replaced by fully functional code contributed by Ulrich Drepper. The
5458 collation information comes from the POSIX locale definitions.
5460 * The new header <langinfo.h> defines an interface for accessing
5461 various locale-dependent data (using the locale chosen with `setlocale').
5463 * Ulrich Drepper has contributed a new suite of functions for operation on
5464 wide-character and multibyte-character strings, in <wchar.h>;
5465 and classification and case conversion of wide characters, in <wctype.h>.
5466 These new functions are conforming to the ISO C, Amendement 1 specification.
5468 * There is now a second implementation of the standard I/O library available.
5469 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5470 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5472 * You can now use positional parameter specifications in format strings
5473 for the `printf' and `scanf' families of functions. For example,
5474 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5475 ``Number 6, Mr Jones''. This is mainly useful when providing different
5476 format strings for different languages, whose grammars may dictate
5477 different orderings of the values being printed. To support this
5478 feature, the interface for `register_printf_handler' has changed; see
5479 the header file <printf.h> for details.
5481 * The `printf' and `scanf' families of functions now understand a new
5482 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5483 to group numbers as indicated by the locale; for `scanf' and friends, this
5484 says to accept as valid only a number with all the proper grouping
5485 separators in the right places. In the default "C" locale, numbers are
5486 not grouped; but locales for specific countries will define the usual
5487 conventions (i.e. separate thousands with `,' in the US locale).
5489 * The pgrp functions have been regularized, slightly incompatibly but much
5490 less confusingly. The core functions are now `getpgid' and `setpgid',
5491 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5492 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5493 provided for compatibility. There is no longer an incompatible `getpgrp'
5494 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5496 * The new header file <fts.h> and suite of functions simplify programs that
5497 operate on directory trees. This code comes from 4.4 BSD.
5499 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5500 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5501 NSS scheme used in glibc.
5503 * There is a new malloc debugging hook `__memalign_hook'.
5505 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5506 `unsigned int' in <sys/types.h>. These are for compatibility only and
5507 their use is discouraged.
5509 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5510 done differently, so that it works even without GNU ld.
5512 * New function `euidaccess' checks allowed access to a file like `access',
5513 but using the effective IDs instead of the real IDs.
5515 * The time zone data files have been updated for the latest and greatest
5516 local time conventions of the countries of the world.
5518 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5521 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5522 for formatting floating-point numbers. They are provided only for
5523 compatibility; new programs should use `sprintf' instead. There are
5524 also equivalent function for the `long double' floating-point type and
5525 all functions also exist in a reentrant form.
5527 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5528 functions for maintaining the login-record files (primarily of use to
5529 system programs such as `login'), and convenient functions for
5530 allocating and initializing a pseudo-terminal (pty) device.
5532 * Ulrich Drepper has contributed new support for System V style
5533 shared memory and IPC on systems that support it.
5535 * Ulrich Drepper has contributed several miscellaneous new functions found
5536 in System V: The `hsearch' family of functions provide an effective
5537 implementation of hash tables; `a64l' and `l64a' provide a very simple
5538 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5541 * Ulrich Drepper has contributed new reentrant counterparts for the
5542 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5544 * Ulrich Drepper has contributed new, highly-optimized versions of several
5545 string functions for the i486/Pentium family of processors.
5547 * Ulrich Drepper has updated the Linux-specific code, based largely
5548 on work done in Hongjiu Lu's version of GNU libc for Linux.
5549 The GNU library now supports Linux versions 2.0.10 and later,
5550 using the ELF object file format (i[3456]86-*-linux).
5552 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5554 * David Mosberger-Tang and Richard Henderson have ported the C library
5555 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
5556 dynamic linking support for ELF/Alpha.
5558 * Richard Henderson contributed several Alpha optimized assembler function
5559 for arithmetic and string handling.
5561 * Ulrich Drepper has contributed a new set of message catalog functions to
5562 support multiple languages using the <libintl.h> interface, for use with
5563 his new package GNU gettext. Translation volunteers have contributed
5564 catalogs of the library's messages in Spanish, German, and Korean.
5566 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5567 program and the `catgets' function for reading the catalog files it
5568 creates. (The <libintl.h> interface is preferred; we include the
5569 <nl_types.h> interface using `catgets' only for source compatibility with
5570 programs already written to use it.)
5572 * New header file <values.h> gives SVID-compatible names for <limits.h>
5575 * Various new macros, declarations, and small header files for compatibility
5578 * New function `group_member' is a convenient way to check if a process has
5579 a given effective group ID.
5581 * When using GCC 2.7 and later, the socket functions are now declared in a
5582 special way so that passing an argument of type `struct sockaddr_in *',
5583 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5584 `struct sockaddr *' type, does not generate a type-clash warning.
5586 * New function `error' declared in header file <error.h> is a convenient
5587 function for printing error messages and optionally exiting; this is the
5588 canonical function used in GNU programs. The new functions `err', `warn',
5589 and friends in header file <err.h> are the canonical 4.4 BSD interface for
5590 doing the same thing.
5592 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5593 POSIX.2 `glob' function to do ~ and {...} expansion.
5595 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5596 `clearenv' which is used in POSIX.9 is also available.
5598 * New function `getsid' returns session ID number on systems that support it.
5600 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
5601 files <db.h> and <mpool.h> provide a rich set of functions for several
5602 types of simple databases stored in memory and in files, and <ndbm.h> is
5603 an old `ndbm'-compatible interface using the `db' functions. Link with
5604 `-ldb' to get these functions.
5606 * New macro `strdupa' copies a string like `strdup', but uses local stack
5607 space from `alloca' instead of dynamic heap space from `malloc'.
5609 * New function `strnlen' is like `strlen' but searches only a given maximum
5610 number of characters for the null terminator. `stpncpy', `strndup' and
5611 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5614 * New function `statfs' in header <sys/statfs.h>.
5616 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5617 provide convenient functions for operating on blocks of null-terminated
5620 * A new suite of functions in <utmp.h> handle all the details of reading
5621 and writing the utmp file.
5623 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5626 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5627 completely POSIX compliant and also implemented the extended functionality
5628 to handle alternate digit representation and alternate era date formats.
5630 * Ulrich Drepper provided an implementation of the `strptime' function
5631 defined in XPG4.2 which transforms a string into a `struct tm' value.
5633 * Paul Eggert provided the tzselect shell script as part of the timezone
5634 code. The shell script makes it easy to select the correct timezone
5637 * The implementation of the malloc family of functions is completely replaced
5638 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5639 The implementation uses the mmap function (if available) and it is
5640 optimized for the use in multi threaded programs.
5642 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5643 functions. This new functionality is usable by specifying a special
5644 salt string and it is compatible with implementation on *BSD systems.
5646 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5647 `getsubopt' to handle second level command line options, `bsd_signal'
5648 to access BSD style `signal' functionality, the obsolete `regexp' style
5651 * the `lchown' function is available on system which support this
5654 * The implementation of the shadow password handling function was contributed
5657 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5659 * POSIX.1g support was added. The <sys/select.h> header is available,
5660 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
5661 implementation of `getaddrinfo'.
5665 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5667 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5668 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
5670 * The new function `daemon' from 4.4 BSD is useful for server programs that
5671 want to put themselves in the background.
5673 * Joel Sherrill has contributed support for several standalone boards that
5674 run without an operating system.
5676 * `printf', `scanf' and friends now accept a `q' type modifier for long
5677 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
5679 * All of the code taken from BSD (notably most of the math and networking
5680 routines) has been updated from the BSD 4.4-Lite release.
5682 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
5684 * The new functions `getdomainname' and `setdomainname' fetch or change the
5685 YP/NIS domain name. These are system calls which exist on systems which
5688 * The time zone data files have been updated for the latest international
5691 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
5692 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
5696 * The C library now includes support for Sun RPC, from Sun's free
5697 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
5698 are included. (There is still no support for YP.)
5700 * Tom Quinn has contributed a port of the C library to SGI machines running
5701 Irix 4 (mips-sgi-irix4).
5703 * The new `lockf' function is a simplified interface to the locking
5704 facilities of `fcntl', included for compatibility.
5706 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
5708 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
5710 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
5713 * The error message printed by `assert' for a failed assertion now includes
5714 the name of the program (if using GNU ld) and the name of the calling
5715 function (with versions of GCC that support this).
5717 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
5719 * The library now includes the <sys/mman.h> header file and memory
5720 management functions `mmap', `munmap', `mprotect', `msync', and
5721 `madvise', on systems that support those facilities.
5723 * The interface for `mcheck' has changed slightly: the function called to
5724 abort the program when an allocation inconsistency is detected now takes
5725 an argument that indicates the type of failure. The new function
5726 `mprobe' lets you request a consistency check for a particular block at
5727 any time (checks are normally done only when you call `free' or `realloc'
5730 * It is now possible to easily cross-compile the C library, building on one
5731 system a library to run on another machine and/or operating system. All
5732 you need to do is set the variable `HOST_CC' in `configparms' to the
5733 native compiler for programs to run on the machine you are building on (a
5734 few generator programs are used on Unix systems); set `CC' to the
5737 * The new function `fexecve' (only implemented on the GNU system) executes
5738 a program file given a file descriptor already open on the file.
5742 * Brendan Kehoe has contributed most of a port to the DEC Alpha
5743 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
5745 * You can set the variable `libprefix' in `configparms' to specify a prefix
5746 to be prepended to installed library files; this makes it easy to install
5747 the GNU C library to be linked as `-lgnuc' or whatever.
5749 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
5750 copies a limited number of characters from a string, and returns the
5751 address of the last character written.
5753 * You no longer need to check for whether the installed `stddef.h' is
5754 compatible with the GNU C library. configure now checks for you.
5756 * You can now define a per-stream `fileno' function to convert the
5757 stream's cookie into an integral file descriptor.
5759 * ``malloc (0)'' no longer returns a null pointer. Instead, it
5760 allocates zero bytes of storage, and returns a unique pointer which
5761 you can pass to `realloc' or `free'. The behavior is undefined if
5762 you dereference this pointer.
5764 * The C library now runs on Sony NEWS m68k machines running either
5765 NewsOS 3 or NewsOS 4.
5767 * The new `syscall' function is a system-dependent primitive function
5768 for invoking system calls. It has the canonical behavior on Unix
5769 systems, including unreliable return values for some calls (such as
5770 `pipe', `fork' and `getppid').
5772 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
5773 to `EAGAIN', which is the preferred name. On systems whose kernels
5774 use two distinct codes, the C library now translates EWOULDBLOCK to
5775 EAGAIN in every system call function.
5779 * The GNU C Library Reference Manual is now distributed with the library.
5780 `make dvi' will produce a DVI file of the printed manual.
5781 `make info' will produce Info files that you can read on line using C-h i
5782 in Emacs or the `info' program.
5783 Please send comments on the manual to bug-glibc-manual@gnu.org.
5785 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
5787 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
5789 * Jason Merrill has contributed a port to the Sequent Symmetry running
5790 Dynix version 3 (i386-sequent-dynix).
5792 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
5793 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
5795 * New function `memory_warnings' lets you arrange to get warnings when
5796 malloc is running out of memory to allocate, like Emacs gives you.
5798 * The C library now contains the relocating allocator used in Emacs 19 for
5799 its editing buffers. This allocator (ralloc) minimizes allocation
5800 overhead and fragmentation by moving allocated regions around whenever it
5801 needs to. You always refer to a ralloc'd region with a "handle" (a
5802 pointer to a pointer--an object of type `void **').
5804 * There is a new `printf' format: `%m' gives you the string corresponding
5805 to the error code in `errno'.
5807 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
5808 or `%[' conversion, but instead of filling in a fixed-sized buffer you
5809 pass, the `a' modifier says to fill in a `char **' you pass with a
5812 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
5813 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
5814 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
5816 * `mkstemp' is a traditional Unix function to atomically create and open a
5817 uniquely-named temporary file.
5821 * The standard location for the file that says what the local timezone is
5822 has changed again. It is now `/usr/local/etc/localtime' (or more
5823 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
5825 * The distribution no longer contains any files with names longer than 14
5828 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
5829 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
5831 * New functions `ttyslot' and `syslog' from 4.4 BSD.
5835 * The configuration process has changed quite a bit. The `configure'
5836 script is now used just like the configuration scripts for other GNU
5837 packages. The `sysdeps' directory hierarchy is much rearranged.
5838 The file `INSTALL' explains the new scheme in detail.
5840 * The header files no longer need to be processed into ANSI C and
5841 traditional C versions. There is just one set of files to install, and
5842 it will work with ANSI or old C compilers (including `gcc -traditional').
5844 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
5845 MIPS DECStation running Ultrix 4.
5847 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
5848 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
5849 made itself into a shared library.
5851 * Yet further improved support for the i386, running 4.3 BSD-like systems
5852 (such as Mach 3 with the Unix single-server), or System V.
5854 * New function `strncasecmp' to do case-insensitive string comparison
5855 with limited length.
5857 * New function `strsep' is a reentrant alternative to `strtok'.
5859 * New functions `scandir' and `alphasort' for searching directories.
5861 * New function `setenv' is a better interface to `putenv'.
5863 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
5864 function for traversing a directory tree.
5866 * The GNU obstack package is now also part of the C library.
5867 The new function `open_obstack_stream' creates a stdio stream that
5868 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
5869 formatted output directly to an obstack.
5871 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
5872 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
5874 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
5876 * The new functions `strfry' and `memfrob' do mysterious and wonderful
5877 things to your strings.
5879 * There are some new test programs: test-fseek, testmb, and testrand.
5881 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
5882 These ports are not finished, but are a good starting place for really
5883 supporting those systems.
5885 * `/etc/localtime' is now the standard location for the file that says what
5886 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
5887 This follows the general principle that `/etc' is the place for all local
5888 configuration files.
5890 * The C library header files now use `extern "C"' when used by the C++
5891 compiler, so the C library should now work with C++ code.
5893 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
5894 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
5897 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
5898 function which uses the `merge sort' algorithm, and is said to be
5899 significantly faster than the old GNU `qsort' function. Merge sort is
5900 now the standard `qsort' function. The new algorithm can require a lot
5901 of temporary storage; so, the old sorting function is called when the
5902 required storage is not available.
5904 * The C library now includes Michael Glad's Ultra Fast Crypt, which
5905 provides the Unix `crypt' function, plus some other entry points.
5907 * The code and header files taken from 4.4 BSD have been updated with the
5908 latest files released from Berkeley.
5910 ----------------------------------------------------------------------
5911 Copyright information:
5913 Copyright (C) 1992-2020 Free Software Foundation, Inc.
5915 Permission is granted to anyone to make or distribute verbatim copies
5916 of this document as received, in any medium, provided that the
5917 copyright notice and this permission notice are preserved,
5918 thus giving the recipient permission to redistribute in turn.
5920 Permission is granted to distribute modified versions
5921 of this document, or of portions of it,
5922 under the above conditions, provided also that they
5923 carry prominent notices stating who last changed them.
5926 version-control: never