1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2020 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Unicode 12.1.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 12.1.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
18 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
19 DT_DEPAUDIT dynamic section entries of the main executable.
21 * powerpc64le supports IEEE128 long double libm/libc redirects when
22 using the -mabi=ieeelongdouble to compile C code on supported GCC
23 toolchains. It is recommended to use GCC 8 or newer when testing
26 * To help detect buffer overflows and other out-of-bounds accesses
27 several APIs have been annotated with GCC 'access' attribute. This
28 should help GCC 10 issue better warnings.
30 * On Linux, functions the pthread_attr_setsigmask_np and
31 pthread_attr_getsigmask_np have been added. They allow applications
32 to specify the signal mask of a thread created with pthread_create.
34 * Support for automatically registering threads with the Linux rseq
35 system call has been added. This system call is implemented starting
36 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
37 operations on per-cpu data. It allows user-space to perform updates
38 on per-cpu data without requiring heavy-weight atomic operations.
39 Automatically registering threads allows all libraries, including libc,
40 to make immediate use of the rseq support by using the documented ABI.
41 The GNU C Library manual has details on integration of Restartable
44 Deprecated and removed features, and other changes affecting compatibility:
46 * The deprecated <sys/sysctl.h> header and the sysctl function have been
47 removed. To support old binaries, the sysctl function continues to
48 exist as a compatibility symbol (on those architectures which had it),
49 but always fails with ENOSYS. This reflects the removal of the system
50 call from all architectures, starting with Linux 5.5.
52 * The sstk function is no longer available to newly linked binaries.
53 Its implementation always returned with a failure, and the function
54 was not declared in any header file.
56 * The legacy signal handling functions siginterrupt, sigpause, sighold,
57 sigrelse, sigignore and sigset, and the sigmask macro have been
58 deprecated. Applications should use the sigsuspend, sigprocmask and
59 sigaction functions instead.
61 * ldconfig now defaults to the new format for ld.so.cache. glibc has
62 already supported this format for almost 20 years.
64 Changes to build and runtime requirements:
66 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
67 long double redirects.
69 Security related changes:
71 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
72 corruption when they were passed a pseudo-zero argument. Reported by Guido
73 Vranken / ForAllSecure Mayhem.
75 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
76 out-of-bounds write when executed in a signal frame context.
78 CVE-2020-1752: A use-after-free vulnerability in the glob function when
79 expanding ~user has been fixed.
81 The following bugs are resolved with this release:
83 [The release manager will add the list generated by
84 scripts/list-fixed-bugs.py just before the release.]
90 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
91 enable features from the draft ISO C2X standard. Only some features from
92 this draft standard are supported by the GNU C Library, and as the draft
93 is under active development, the set of features enabled by this macro is
94 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
95 by compiling with "gcc -std=gnu2x".
97 * The <math.h> functions that round their results to a narrower type now
98 have corresponding type-generic macros in <tgmath.h>, as defined in TS
99 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
100 Clarification Request 13 to TS 18661-3.
102 * The function pthread_clockjoin_np has been added, enabling join with a
103 terminated thread with a specific clock. It allows waiting against
104 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
106 * New locale added: mnw_MM (Mon language spoken in Myanmar).
108 * The DNS stub resolver will optionally send the AD (authenticated data) bit
109 in queries if the trust-ad option is set via the options directive in
110 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
111 mode, the AD bit, as provided by the name server, is available to
112 applications which call res_search and related functions. In the default
113 mode, the AD bit is not set in queries, and it is automatically cleared in
114 responses, indicating a lack of DNSSEC validation. (Therefore, the name
115 servers and the network path to them are treated as untrusted.)
117 Deprecated and removed features, and other changes affecting compatibility:
119 * The totalorder and totalordermag functions, and the corresponding
120 functions for other floating-point types, now take pointer arguments to
121 avoid signaling NaNs possibly being converted to quiet NaNs in argument
122 passing. This is in accordance with the resolution of Clarification
123 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
124 floating-point arguments directly will continue to work.
126 * The obsolete function stime is no longer available to newly linked
127 binaries, and its declaration has been removed from <time.h>.
128 Programs that set the system time should use clock_settime instead.
130 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
131 in a future version of glibc. In this release, the header still exists
132 but calling ftime will cause a compiler warning. All programs should use
133 gettimeofday or clock_gettime instead.
135 * The gettimeofday function no longer reports information about a
136 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
137 many years, as it cannot handle the full complexity of the world's
138 timezones, but hitherto we have supported it on a best-effort basis.
139 Changes required to support 64-bit time_t on 32-bit architectures have
140 made this no longer practical.
142 As of this release, callers of gettimeofday with a non-null 'tzp' argument
143 should expect to receive a 'struct timezone' whose tz_minuteswest and
144 tz_dsttime fields are zero. (For efficiency reasons, this does not always
145 happen on a few Linux-based ports. This will be corrected in a future
148 All callers should supply a null pointer for the 'tzp' argument to
149 gettimeofday. For accurate information about the time zone associated
150 with the current time, use the localtime function.
152 gettimeofday itself is obsolescent according to POSIX. We have no plans
153 to remove access to this function, but portable programs should consider
154 using clock_gettime instead.
156 * The settimeofday function can still be used to set a system-wide time
157 zone when the operating system supports it. This is because the Linux
158 kernel reused the API, on some architectures, to describe a system-wide
159 time-zone-like offset between the software clock maintained by the kernel,
160 and the "RTC" clock that keeps time when the system is shut down.
162 However, to reduce the odds of this offset being set by accident,
163 settimeofday can no longer be used to set the time and the offset
164 simultaneously. If both of its two arguments are non-null, the call
165 will fail (setting errno to EINVAL).
167 Callers attempting to set this offset should also be prepared for the call
168 to fail and set errno to ENOSYS; this already happens on the Hurd and on
169 some Linux architectures. The Linux kernel maintainers are discussing a
170 more principled replacement for the reused API. After a replacement
171 becomes available, we will change settimeofday to fail with ENOSYS on all
172 platforms when its 'tzp' argument is not a null pointer.
174 settimeofday itself is obsolescent according to POSIX. Programs that set
175 the system time should use clock_settime and/or the adjtime family of
176 functions instead. We may cease to make settimeofday available to newly
177 linked binaries after there is a replacement for Linux's time-zone-like
180 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
181 the optional CAS instruction is implemented (for instance, LEON processors
182 are still supported, but SuperSPARC processors are not).
184 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
187 * If a lazy binding failure happens during dlopen, during the execution of
188 an ELF constructor, the process is now terminated. Previously, the
189 dynamic loader would return NULL from dlopen, with the lazy binding error
190 captured in a dlerror message. In general, this is unsafe because
191 resetting the stack in an arbitrary function call is not possible.
193 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
194 executable stack unless explicitly configured at build time to require
195 minimum kernel version 4.8 or newer. This is because executing
196 floating-point branches on a non-executable stack on Linux kernels prior to
197 4.8 can lead to application crashes for some MIPS configurations. While
198 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
199 expected to enable non-executable stack by default with PT_GNU_STACK by
200 default and is thus likely to trigger a crash on older kernels.
202 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
203 non-executable stack while dropping support for older kernels.
205 * System call wrappers for time system calls now use the new time64 system
206 calls when available. On 32-bit targets, these wrappers attempt to call
207 the new system calls first and fall back to the older 32-bit time system
208 calls if they are not present. This may cause issues in environments
209 that cannot handle unsupported system calls gracefully by returning
210 -ENOSYS. Seccomp sandboxes are affected by this issue.
212 Changes to build and runtime requirements:
214 * It is no longer necessary to have recent Linux kernel headers to build
215 working (non-stub) system call wrappers on all architectures except 64-bit
216 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
218 * The ChangeLog file is no longer present in the toplevel directory of the
219 source tree. ChangeLog files are located in the ChangeLog.old directory as
220 ChangeLog.N where the highest N has the latest entries.
222 Security related changes:
224 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
225 environment variable during program execution after a security
226 transition, allowing local attackers to restrict the possible mapping
227 addresses for loaded libraries and thus bypass ASLR for a setuid
228 program. Reported by Marcin KoĆcielnicki.
230 The following bugs are resolved with this release:
232 [12031] localedata: iconv -t ascii//translit with Greek characters
233 [15813] libc: Multiple issues in __gen_tempname
234 [17726] libc: [arm, sparc] profil_counter should be compat symbol
235 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
236 [19767] libc: vdso is not used with static linking
237 [19903] hurd: Shared mappings not being inherited by children processes
238 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
239 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
241 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
242 Symbols-A/B Unicode blocks
243 [23518] libc: Eliminate __libc_utmp_jump_table
244 [24026] malloc: malloc_info() returns wrong numbers
245 [24054] localedata: Many locales are missing date_fmt
246 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
247 [24304] dynamic-link: Lazy binding failure during ELF
248 constructors/destructors is not fatal
249 [24376] libc: RISC-V symbol size confusion with _start
250 [24682] localedata: zh_CN first weekday should be Monday per GB/T
252 [24824] libc: test-in-container does not install charmap files compatible
254 [24844] regex: regex bad pointer / leakage if malloc fails
255 [24867] malloc: Unintended malloc_info formatting changes
256 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
257 [24880] libc: login: utmp implementation uses struct flock with fcntl64
258 [24882] libc: login: pututline uses potentially outdated cache
259 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
260 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
262 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
264 [24930] dynamic-link: dlopen of PIE executable can result in
265 _dl_allocate_tls_init assertion failure
266 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
267 (stringop-overflow error)
268 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
269 functions other can lead to crashes
270 [24967] libc: jemalloc static linking causes runtime failure
271 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
273 [25035] libc: sbrk() failure handled poorly in tunables_strdup
274 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
275 [25097] libc: new -Warray-bounds with GCC 10
276 [25112] dynamic-link: dlopen must not make new objects accessible when it
277 still can fail with an error
278 [25139] localedata: Please add the new mnw_MM locale
279 [25149] regex: Array bounds violation in proceed_next_node
280 [25157] dynamic-link: Audit cookie for the dynamic loader is not
281 initialized correctly
282 [25189] libc: glibc's __glibc_has_include causes issues with clang
284 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
286 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
287 binaries (CVE-2019-19126)
288 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
290 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
292 [25232] string: <string.h> does not enable const correctness for strchr et
294 [25233] localedata: Consider "." as the thousands separator for sl_SI
296 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
297 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
298 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
300 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
301 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
303 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
304 (dl_initfirst) link map pointer
305 [25401] malloc: pvalloc must not have __attribute_alloc_size__
306 [25423] libc: Array overflow in backtrace on powerpc
307 [25425] network: Missing call to __resolv_context_put in
308 getaddrinfo.c:gethosts
315 * Unicode 12.1.0 Support: Character encoding, character type info, and
316 transliteration tables are all updated to Unicode 12.1.0, using
317 generator scripts contributed by Mike FABIAN (Red Hat).
319 * The dynamic linker accepts the --preload argument to preload shared
320 objects, in addition to the LD_PRELOAD environment variable.
322 * The twalk_r function has been added. It is similar to the existing
323 twalk function, but it passes an additional caller-supplied argument
324 to the callback function.
326 * On Linux, the getdents64, gettid, and tgkill functions have been added.
328 * Minguo (Republic of China) calendar support has been added as an
329 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
332 * The entry for the new Japanese era has been added for ja_JP locale.
334 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
335 pvalloc, memalign, and posix_memalign fail now with total object size
336 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
337 pointer subtraction within the allocated object, where results might
338 overflow the ptrdiff_t type.
340 * The dynamic linker no longer refuses to load objects which reference
341 versioned symbols whose implementation has moved to a different soname
342 since the object has been linked. The old error message, symbol
343 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
344 link time reference, is gone.
346 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
347 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
348 functions. These behave similarly to their "timed" equivalents, but also
349 accept a clockid_t parameter to determine which clock their timeout should
350 be measured against. All functions allow waiting against CLOCK_MONOTONIC
351 and CLOCK_REALTIME. The decision of which clock to be used is made at the
352 time of the wait (unlike with pthread_condattr_setclock, which requires
353 the clock choice at initialization time).
355 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
356 work, new resolvers can use a second argument which can be extended in
357 the future, currently it contains the AT_HWCAP2 value.
359 Deprecated and removed features, and other changes affecting compatibility:
361 * The copy_file_range function fails with ENOSYS if the kernel does not
362 support the system call of the same name. Previously, user space
363 emulation was performed, but its behavior did not match the kernel
364 behavior, which was deemed too confusing. Applications which use the
365 copy_file_range function can no longer rely on glibc to provide a fallback
366 on kernels that do not support the copy_file_range system call, and if
367 this function returns ENOSYS, they will need to use their own fallback.
368 Support for copy_file_range for most architectures was added in version
369 4.5 of the mainline Linux kernel.
371 * The functions clock_gettime, clock_getres, clock_settime,
372 clock_getcpuclockid, clock_nanosleep were removed from the librt library
373 for new applications (on architectures which had them). Instead, the
374 definitions in libc will be used automatically, which have been available
377 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
378 and <sys/stropts.h> have been removed.
380 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
381 resolver flag (deprecated in glibc 2.25) have been removed.
383 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
384 resolver have been removed from <resolv.h>.
386 * With --enable-bind-now, installed programs are now linked with the
389 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
390 configurations) has been removed, following the deprecation of this
391 subarchitecture in version 8 of GCC, and its removal in version 9.
393 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
394 header have been removed.
396 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
397 deprecated and will be removed from a future version of glibc.
398 Application should directly access /proc instead. For obtaining random
399 bits, the getentropy function can be used.
401 Changes to build and runtime requirements:
403 * GCC 6.2 or later is required to build the GNU C Library.
405 Older GCC versions and non-GNU compilers are still supported when
406 compiling programs that use the GNU C Library.
408 Security related changes:
410 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
411 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
412 has undefined behavior. On x32, the size_t argument may be passed
413 in the lower 32 bits of the 64-bit RDX register with non-zero upper
414 32 bits. When it happened with the sign bit of RDX register set,
415 memcmp gave the wrong result since it treated the size argument as
416 zero. Reported by H.J. Lu.
418 CVE-2019-9169: Attempted case-insensitive regular-expression match
419 via proceed_next_node in posix/regexec.c leads to heap-based buffer
420 over-read. Reported by Hongxu Chen.
422 The following bugs are resolved with this release:
424 [2872] locale: Transliteration Cyrillic -> ASCII fails
425 [6399] libc: gettid() should have a wrapper
426 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
427 [16976] glob: fnmatch unbounded stack VLA for collating symbols
428 [17396] localedata: globbing for locale by [[.collating-element.]]
429 [18035] dynamic-link: pldd does no longer work, enters infinite loop
430 [18465] malloc: memusagestat is built using system C library
431 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
432 invalid input drops valid char
433 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
434 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
435 [21897] localedata: Afar locales: Fix mon, abmon, and abday
436 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
437 [23352] malloc: __malloc_check_init still defined in public header
439 [23403] nptl: Wrong alignment of TLS variables
440 [23501] libc: nftw() doesn't return dangling symlink's inode
441 [23733] malloc: Check the count before calling tcache_get()
442 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
444 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
445 [23844] nptl: pthread_rwlock_trywrlock results in hang
446 [23983] argparse: Missing compat versions of argp_failure and argp_error
447 for long double = double
448 [23984] libc: Missing compat versions of err.h and error.h functions for
450 [23996] localedata: Dutch salutations
451 [24040] libc: riscv64: unterminated call chain in __thread_start
452 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
454 [24051] stdio: puts and putchar ouput to _IO_stdout instead of stdout
455 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
457 [24114] regex: regexec buffer read overrun in "grep -i
458 '\(\(\)*.\)*\(\)\(\)\1'"
459 [24122] libc: Segfaults if 0 returned from la_version
460 [24153] stdio: Some input functions do not react to stdin assignment
461 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
462 RDX is set) (CVE-2019-7309)
463 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
464 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
465 not the default "nor"
466 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
467 false positives, change to modern flexible array
468 [24180] nptl: pthread_mutex_trylock does not use the correct order of
469 instructions while maintaining the robust mutex list due to missing
471 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
472 unnecessary librt dependencies
473 [24200] localedata: Revert first_weekday removal in en_IE locale
474 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
475 [24215] nptl: pthread_timedjoin_np should be a cancellation point
476 [24216] malloc: Check for large bin list corruption when inserting
478 [24228] stdio: old x86 applications that use legacy libio crash on exit
479 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
481 [24293] localedata: Missing Minguo calendar support for TW locales
482 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
484 [24307] localedata: Update locale data to Unicode 12.0.0
485 [24323] dynamic-link: dlopen should not be able open PIE objects
486 [24335] build: "Obsolete types detected" with Linux 5.0 headers
487 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
489 [24370] localedata: Add lang_name for tt_RU locale
490 [24372] locale: Binary locale files are not architecture independent
491 [24394] time: strptime %Ey mis-parses final year of era
492 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
494 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
496 [24531] malloc: Malloc tunables give tcache assertion failures
497 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
499 [24535] localedata: Update locale data to Unicode 12.1.0
500 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
501 kernels and break testing
502 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
503 [24556] build: [GCC 9] error: â%sâ directive argument is null
504 [-Werror=format-overflow=]
505 [24570] libc: alpha: compat msgctl uses __IPC_64
506 [24584] locale: Data race in __wcsmbs_clone_conv
507 [24588] stdio: Remove codecvt vtables from libio
508 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
510 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
511 [24632] stdio: Old binaries which use freopen with default stdio handles
513 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
515 [24652] localedata: szl_PL spelling correction
516 [24695] nss: nss_db: calling getpwent after endpwent crashes
517 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
518 in /etc/nsswitch.conf
519 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
520 [24740] libc: getdents64 type confusion
521 [24741] dynamic-link: ld.so should not require that a versioned symbol is
522 always implemented in the same library
523 [24744] libc: Remove copy_file_range emulation
524 [24757] malloc: memusagestat is linked against system libpthread
525 [24794] libc: Partial test suite run builds corrupt test-in-container
533 * The getcpu wrapper function has been added, which returns the currently
534 used CPU and NUMA node. This function is Linux-specific.
536 * A new convenience target has been added for distribution maintainers
537 to build and install all locales as directories with files. The new
538 target is run by issuing the following command in your build tree:
539 'make localedata/install-locale-files', with an optional DESTDIR
540 to set the install root if you wish to install into a non-default
543 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
545 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
546 for _GNU_SOURCE, to match BSD environments.
548 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
549 indicates that it will abort the transaction prior to entering the kernel
550 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
551 suspended, and this caused some undefined side-effects issues by aborting
552 transactions manually. Glibc avoided it by abort transactions manually on
553 each syscall, but it lead to performance issues on newer kernels where the
554 HTM state is saved and restore lazily (the state being saved even when the
555 process actually does not use HTM).
557 * The functions posix_spawn_file_actions_addchdir_np and
558 posix_spawn_file_actions_addfchdir_np have been added, enabling
559 posix_spawn and posix_spawnp to run the new process in a different
560 directory. These functions are GNU extensions. The function
561 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
564 * The popen and system do not run atfork handlers anymore (BZ#17490).
565 Although it is a possible POSIX violation, the POSIX rationale in
566 pthread_atfork documentation regarding atfork handlers is to handle
567 inconsistent mutex state after a fork call in a multi-threaded process.
568 In both popen and system there is no direct access to user-defined mutexes.
570 * Support for the C-SKY ABIV2 running on Linux has been added. This port
571 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
573 - C-SKY ABIV2 soft-float little-endian
574 - C-SKY ABIV2 hard-float little-endian
576 * strftime's default formatting of a locale's alternative year (%Ey)
577 has been changed to zero-pad the year to a minimum of two digits,
578 like "%y". This improves the display of Japanese era years during
579 the first nine years of a new era, and is expected to be harmless
580 for all other locales (only Japanese locales regularly have
581 alternative year numbers less than 10). Zero-padding can be
582 overridden with the '_' or '-' flags (which are GNU extensions).
584 * As a GNU extension, the '_' and '-' flags can now be applied to
585 "%EY" to control how the year number is formatted; they have the
586 same effect that they would on "%Ey".
588 Deprecated and removed features, and other changes affecting compatibility:
590 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
591 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
593 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
594 in <sys/procfs.h>, has been corrected to match the type actually used by
595 the Linux kernel. This affects the size and layout of that structure on
596 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
598 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
599 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
600 defined in <sys/procfs.h>, has been corrected to match the type actually
601 used by the Linux kernel. This affects the size and layout of those
604 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
605 meant to scan a string and allocate space for it with malloc, is now
606 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
607 defined. This extension conflicts with C99's use of '%a' to scan a
608 hexadecimal floating-point number, which is now available to programs
609 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
611 POSIX.1-2008 includes the feature of allocating a buffer for string input
612 with malloc, using the modifier letter 'm' instead. Programs using
613 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
614 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
615 C99 '%a' no longer need to avoid _GNU_SOURCE.
617 GCC's -Wformat warnings can detect most uses of this extension, as long
618 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
619 __attribute__ ((format (scanf, ...))).
621 Changes to build and runtime requirements:
623 * Python 3.4 or later is required to build the GNU C Library.
625 * On most architectures, GCC 5 or later is required to build the GNU C
626 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
628 Older GCC versions and non-GNU compilers are still supported when
629 compiling programs that use the GNU C Library.
631 Security related changes:
633 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
634 denial of service due to resource exhaustion when processing getaddrinfo
635 calls with crafted host names. Reported by Guido Vranken.
637 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
638 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
639 happened, accessing the 32-bit size_t value as the full 64-bit register
640 in the assembly string/memory functions would cause a buffer overflow.
643 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
644 addresses with arbitrary trailing characters, potentially leading to data
645 or command injection issues in applications.
647 The following bugs are resolved with this release:
649 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
650 [10496] localedata: 12h time representation in multiple locales faulty
651 [10797] localedata: it_IT locale numeric does not have a separator for
653 [11319] libc: dprintf doesn't handle errors properly
654 [16346] time: mktime: potentially unsafe use of localtime_offset
655 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
657 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
658 posix_spawn_file_actions_addfchdir_np
659 [17426] localedata: Indian locales: set the correct date format
660 [17490] stdio: popen should not invoke atfork handlers
661 [17783] libc: TIOCSER_TEMT conditions inconsistent
662 [18040] regex: use-after-free in regexec/get_subexp
663 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
664 [20018] network: getaddrinfo should reject IP addresses with trailing
665 characters (CVE-2016-10739)
666 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
667 [20271] libc: Missing "\n" in __libc_fatal calls
668 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
669 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
670 pointer argument is non-NULL
671 [21037] stdio: open_memstream and freopen
672 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
673 [21716] time: Crash in glibc's mktime in low-memory situations
674 [22834] stdio: Subprocess forked by popen may crash in Linux when
675 multithreads call popen
676 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
677 and pthread_create fails.
678 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
679 [23125] libc: riscv64: endless loop when throwing an exception from a
681 [23275] nptl: Race in pthread_mutex_lock while promoting to
682 PTHREAD_MUTEX_ELISION_NP.
683 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
685 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
687 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
689 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
690 [23509] dynamic-link: CET enabled glibc is incompatible with the older
692 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
693 [23521] nss: get_next_alias nss_files file stream leak
694 [23538] nptl: Hang in pthread_cond_broadcast
695 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
696 [23578] regex: Invalid memory access if regex pattern contains NUL byte
697 [23579] libc: Errors misreported in preadv2
698 [23597] build: support/test-container.c doesn't work with different
700 [23603] time: mktime signed integer overflow on large timestamps
701 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
702 [23614] libc: powerpc: missing CFI register information in __mpn_*
704 [23637] string: Generic strstr/strcasestr fails with huge needles
705 [23640] libc: no way to easily clear FD_CLOEXEC in
706 posix_spawn_file_actions_adddup2()
707 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
709 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
711 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
712 [23689] libc: Bug in documentation for rusage.ru_ixrss in
713 bits/types/struct_rusage.h
714 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
716 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
718 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
719 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
720 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
722 [23724] localedata: Albanian date formats are incorrect
723 [23735] math: libnldbl_nonshared.a references internal libm symbols
724 [23740] localedata: kl_GL: Month names and date formats need update
725 [23744] regex: regex refactorings to remove BE, avoid duplication
726 [23745] time: mktime fix for Gnulib + coreutils
727 [23758] time: Improve the width of alternate representation for year in
729 [23783] libc: [mips] Missing CMSPAR bits/termios.h
730 [23789] time: mktime does not set errno on failure
731 [23791] localedata: Wrong monetary format for ca_ES locale
732 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
733 [23794] locale: c16rtomb does not handle surrogate pairs
734 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
735 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
736 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
737 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
738 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
739 [23862] libc: [sh] missing kernel-features.h undefines
740 [23864] libc: [riscv] missing kernel-features.h undefines
741 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
742 [23907] malloc: Incorrect double-free malloc tcache check disregards
744 [23913] libc: off-by-one in function maybe_script_execute in
745 sysdeps/posix/spawni.c
746 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
747 [23923] locale: Add --no-hard-links option to localedef
748 [23927] network: Linux if_nametoindex() does not close descriptor
750 [23961] math: powf can overflow to inf without setting errno in non-
751 nearest rounding mode
752 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
753 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
754 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
755 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
756 [24011] localedata: Fixed small type in comment for locale bs_BA
757 [24018] libc: gettext() may return NULL
758 [24022] build: riscv build failure with Linux kernel 4.20-rc7
759 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
760 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
762 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
763 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
765 [24046] localedata: en_US locale doesn't define date_fmt
766 [24063] manual: @var{errno} should be @code{errno}
767 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
768 [24088] libc: VSCR field is not being correctly read in ucontext_t on
770 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
772 [24097] string: Can't use 64-bit register for size_t in assembly codes for
774 [24110] hurd: SS_DISABLE never set in stack_t value returned by
776 [24112] network: Do not send DNS queries for non-host names (where all
777 answers will be rejected)
778 [24130] libc: alpha __remqu corrupts $f3 register
785 * The localization data for ISO 14651 is updated to match the 2016
786 Edition 4 release of the standard, this matches data provided by
787 Unicode 9.0.0. This update introduces significant improvements to the
788 collation of Unicode characters. This release deviates slightly from
789 the standard in that the collation element ordering for lowercase and
790 uppercase LATIN script characters is adjusted to ensure that regular
791 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
792 is not matched by [a-z]. With the update many locales have been
793 updated to take advantage of the new collation information. The new
794 collation information has increased the size of the compiled locale
795 archive or binary locales.
797 * The GNU C Library can now be compiled with support for Intel CET, AKA
798 Intel Control-flow Enforcement Technology. When the library is built
799 with --enable-cet, the resulting glibc is protected with indirect
800 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
801 compatible with all existing executables and shared libraries. This
802 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
803 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
804 capable of multi-byte NOPs, like x86-64 processors as well as Intel
805 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
806 x86_64 and x32 on non-CET processors. --enable-cet has been tested
807 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
810 * The GNU C Library now has correct support for ABSOLUTE symbols
811 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
812 relocated incorrectly or in some cases discarded. The GNU linker can
813 make use of the newer semantics, but it must communicate it to the
814 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
815 field) to indicate such support is required.
817 * Unicode 11.0.0 Support: Character encoding, character type info, and
818 transliteration tables are all updated to Unicode 11.0.0, using
819 generator scripts contributed by Mike FABIAN (Red Hat).
821 * <math.h> functions that round their results to a narrower type are added
822 from TS 18661-1:2014 and TS 18661-3:2015:
824 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
827 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
830 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
833 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
836 * Two grammatical forms of month names are now supported for the following
837 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
838 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
839 support two grammatical forms in abbreviated month names: Catalan, Greek,
842 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
843 include the support for two grammatical forms of month names.
845 * Building and running on GNU/Hurd systems now works without out-of-tree
848 * The renameat2 function has been added, a variant of the renameat function
849 which has a flags argument. If the flags are zero, the renameat2 function
850 acts like renameat. If the flag is not zero and there is no kernel
851 support for renameat2, the function will fail with an errno value of
852 EINVAL. This is different from the existing gnulib function renameatu,
853 which performs a plain rename operation in case of a RENAME_NOREPLACE
854 flags and a non-existing destination (and therefore has a race condition
855 that can clobber the destination inadvertently).
857 * The statx function has been added, a variant of the fstatat64
858 function with an additional flags argument. If there is no direct
859 kernel support for statx, glibc provides basic stat support based on
860 the fstatat64 function.
862 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
863 library if installed. libidn2 version 2.0.5 or later is recommended. If
864 libidn2 is not available, internationalized domain names are not encoded
865 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
866 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
867 with an encoding error.) Flags which used to change the IDN encoding and
868 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
869 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
870 deprecated. They no longer have any effect.
872 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
873 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
874 range of ELF gABI expressions including such constructs as
875 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
876 have been further restricted, and where in the past a dynamic string
877 token sequence may have been interpreted as a literal string it will
878 now cause a load failure. These load failures were always considered
879 unspecified behaviour from the perspective of the dynamic loader, and
880 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
881 results in a load failure now.
883 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
884 implementation includes all the standard functions provided by
887 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
888 thrd_detach, thrd_exit, and thrd_join for thread management.
890 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
891 mtx_destroy for mutual exclusion.
893 - call_once for function call synchronization.
895 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
896 cnd_wait for conditional variables.
898 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
900 Application developers must link against libpthread to use ISO C threads.
902 Deprecated and removed features, and other changes affecting compatibility:
904 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
905 installed. Software that was using either header should be updated to
906 use standard <stdio.h> interfaces instead.
908 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
909 This was never required by the C standard, and the macros just expanded
910 to call alternative names for the same functions. If you hoped getc and
911 putc would provide performance improvements over fgetc and fputc, instead
912 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
913 necessary, flockfile and funlockfile.
915 * All stdio functions now treat end-of-file as a sticky condition. If you
916 read from a file until EOF, and then the file is enlarged by another
917 process, you must call clearerr or another function with the same effect
918 (e.g. fseek, rewind) before you can read the additional data. This
919 corrects a longstanding C99 conformance bug. It is most likely to affect
920 programs that use stdio to read interactive input from a terminal.
923 * The macros 'major', 'minor', and 'makedev' are now only available from
924 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
925 headers that happen to include <sys/types.h>. These macros are rarely
926 used, not part of POSIX nor XSI, and their names frequently collide with
927 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
930 <sys/sysmacros.h> is a GNU extension. Portable programs that require
931 these macros should first include <sys/types.h>, and then include
932 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
934 * The tilegx*-*-linux-gnu configurations are no longer supported.
936 * The obsolete function ustat is no longer available to newly linked
937 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
938 function has been deprecated in favor of fstatfs and statfs.
940 * The obsolete function nfsservctl is no longer available to newly linked
941 binaries. This function was specific to systems using the Linux kernel
942 and could not usefully be used with the GNU C Library on systems with
943 version 3.1 or later of the Linux kernel.
945 * The obsolete function name llseek is no longer available to newly linked
946 binaries. This function was specific to systems using the Linux kernel
947 and was not declared in a header. Programs should use the lseek64 name
948 for this function instead.
950 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
951 getaddrinfo and getnameinfo functions have been deprecated. The behavior
952 previously selected by them is now always enabled.
954 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
955 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
956 restriction (rejecting '_' in host names, among other things) has been
957 removed, for increased compatibility with non-IDN name resolution.
959 * The fcntl function now have a Long File Support variant named fcntl64. It
960 is added to fix some Linux Open File Description (OFD) locks usage on non
961 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
962 fcntl and LFS support is handled transparently. Also for Linux, the OFD
963 locks act as a cancellation entrypoint.
965 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
966 ecb_crypt, and des_setparity are no longer available to newly linked
967 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
968 longer installed. These functions encrypted and decrypted data with the
969 DES block cipher, which is no longer considered secure. Software that
970 still uses these functions should switch to a modern cryptography library,
973 * Reflecting the removal of the encrypt and setkey functions above, the
974 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
975 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
978 * The obsolete function fcrypt is no longer available to newly linked
979 binaries. It was just another name for the standard function crypt,
980 and it has not appeared in any header file in many years.
982 * We have tentative plans to hand off maintenance of the passphrase-hashing
983 library, libcrypt, to a separate development project that will, we hope,
984 keep up better with new passphrase-hashing algorithms. We will continue
985 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
986 'crypt_r' should not need to change at all; however, distributions will
987 need to install <crypt.h> and libcrypt from a separate project.
989 In this release, if the configure option --disable-crypt is used, glibc
990 will not install <crypt.h> or libcrypt, making room for the separate
991 project's versions of these files. The plan is to make this the default
992 behavior in a future release.
994 Changes to build and runtime requirements:
996 GNU make 4.0 or later is now required to build glibc.
998 Security related changes:
1000 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1001 been fixed by removing the glibc-internal IDNA implementation and using
1002 the system-provided libidn2 library instead. Originally reported by Hanno
1003 Böck and Christian Weisgerber.
1005 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1006 architecture could corrupt memory. Reported by Max Horn.
1008 CVE-2018-11236: Very long pathname arguments to realpath function could
1009 result in an integer overflow and buffer overflow. Reported by Alexey
1012 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1013 architecture could write beyond the target buffer, resulting in a buffer
1014 overflow. Reported by Andreas Schwab.
1016 The following bugs are resolved with this release:
1018 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1019 [6889] manual: 'PWD' mentioned but not specified
1020 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1021 when __WORDSIZE != 64
1022 [13762] regex: re_search etc. should return -2 on memory exhaustion
1023 [13888] build: /tmp usage during testing
1024 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1025 [14092] nptl: Support C11 threads
1026 [14095] localedata: Review / update collation data from Unicode / ISO
1028 [14508] libc: -Wformat warnings
1029 [14553] libc: Namespace pollution loff_t in sys/types.h
1030 [14890] libc: Make NT_PRFPREG canonical.
1031 [15105] libc: Extra PLT references with -Os
1032 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1034 [16335] manual: Feature test macro documentation incomplete and out of
1036 [16552] libc: Unify umount implementations in terms of umount2
1037 [17082] libc: htons et al.: statement-expressions prevent use on global
1038 scope with -O1 and higher
1039 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1040 [17438] localedata: pt_BR: wrong d_fmt delimiter
1041 [17662] libc: please implement binding for the new renameat2 syscall
1042 [17721] libc: __restrict defined as /* Ignore */ even in c11
1043 [17979] libc: inconsistency between uchar.h and stdint.h
1044 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1045 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1046 horrible machine code)
1047 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1049 [18471] libc: llseek should be a compat symbol
1050 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1052 [18991] nss: nss_files skips large entry in database
1053 [19239] libc: Including stdlib.h ends up with macros major and minor being
1055 [19463] libc: linknamespace failures when compiled with -Os
1056 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1057 [19527] locale: Normalized charset name not recognized by setlocale
1058 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1059 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1061 [19728] network: out of bounds stack read in libidn function
1062 idna_to_ascii_4i (CVE-2016-6261)
1063 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1064 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1065 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1067 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1068 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1069 [20419] dynamic-link: files with large allocated notes crash in
1071 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1072 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1073 [20980] manual: CFLAGS environment variable replaces vital options
1074 [21163] regex: Assertion failure in pop_fail_stack when executing a
1075 malformed regexp (CVE-2015-8985)
1076 [21234] manual: use of CFLAGS makes glibc detect no optimization
1077 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1078 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1079 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1080 [21508] locale: intl/tst-gettext failure with latest msgfmt
1081 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1082 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1083 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1085 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1087 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1088 [22247] network: Integer overflow in the decode_digit function in
1089 puny_decode.c in libidn (CVE-2017-14062)
1090 [22342] nscd: NSCD not properly caching netgroup
1091 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1092 [22550] localedata: es_ES locale (and other es_* locales): collation
1093 should treat ñ as a primary different character, sync the collation
1094 for Spanish with CLDR
1095 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1096 by gcc configured with --enable-default-pie
1097 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1098 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1099 crossing 2GB threshold (CVE-2017-18269)
1100 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1102 [22735] time: Misleading typo in time.h source comment regarding
1104 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1105 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1106 `__assert_perror_fail ()' to `__assert_fail_base ()'
1107 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1109 [22786] libc: Stack buffer overflow in realpath() if input size is close
1110 to SSIZE_MAX (CVE-2018-11236)
1111 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1112 through an absolute DT_NEEDED path
1113 [22792] build: tcb-offsets.h dependency dropped
1114 [22797] libc: pkey_get() uses non-reserved name of argument
1115 [22807] libc: PTRACE_* constants missing for powerpc
1116 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1117 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1118 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1119 [22848] localedata: ca_ES: update date definitions from CLDR
1120 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1121 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1122 [22896] localedata: Update locale data for an_ES
1123 [22902] math: float128 test failures with GCC 8
1124 [22918] libc: multiple common of `__nss_shadow_database'
1125 [22919] libc: sparc32: backtrace yields infinite backtrace with
1127 [22926] libc: FTBFS on powerpcspe
1128 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1130 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1131 [22947] libc: FAIL: misc/tst-preadvwritev2
1132 [22963] localedata: cs_CZ: Add alternative month names
1133 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1134 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1135 [22998] dynamic-link: execstack tests are disabled when SELinux is
1137 [23005] network: Crash in __res_context_send after memory allocation
1139 [23007] math: strtod cannot handle -nan
1140 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1141 [23036] regex: regex equivalence class regression
1142 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1143 [23069] libc: sigaction broken on riscv64-linux-gnu
1144 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1145 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1146 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1147 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1148 and libc build with -Os)
1149 [23140] localedata: More languages need two forms of month names
1150 [23145] libc: _init/_fini aren't marked as hidden
1151 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1152 [23171] math: C++ iseqsig for long double converts arguments to double
1153 [23178] nscd: sudo will fail when it is run in concurrent with commands
1154 that changes /etc/passwd
1155 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1157 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1158 [23208] localedata: New locale - Lower Sorbian (dsb)
1159 [23233] regex: Memory leak in build_charclass_op function in file
1161 [23236] stdio: Harden function pointers in _IO_str_fields
1162 [23250] nptl: Offset of __private_ss differs from GCC
1163 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1164 -mtune=generic -mfpmath=sse
1165 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1167 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1168 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1170 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1171 [23277] math: nan function should not have const attribute
1172 [23279] math: scanf and strtod wrong for some hex floating-point
1173 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1175 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1176 [23303] build: undefined reference to symbol
1177 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1178 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1180 [23313] stdio: libio vtables validation and standard file object
1182 [23329] libc: The __libc_freeres infrastructure is not properly run across
1184 [23349] libc: Various glibc headers no longer compatible with
1186 [23351] malloc: Remove unused code related to heap dumps and malloc
1188 [23363] stdio: stdio-common/tst-printf.c has non-free license
1189 [23396] regex: Regex equivalence regression in single-byte locales
1190 [23422] localedata: oc_FR: More updates of locale data
1191 [23442] build: New warning with GCC 8
1192 [23448] libc: Out of bounds access in IBM-1390 converter
1193 [23456] libc: Wrong index_cpu_LZCNT
1194 [23458] build: tst-get-cpu-features-static isn't added to tests
1195 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1197 [23467] dynamic-link: x86/CET: A property note parser bug
1204 * The GNU C Library can now be compiled with support for building static
1205 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1206 executables are like static executables but can be loaded at any address
1207 and provide additional security hardening benefits at the cost of some
1208 memory and performance. When the library is built with --enable-static-pie
1209 the resulting libc.a is usable with GCC 8 and above to create static PIE
1210 executables using the GCC option '-static-pie'. This feature is currently
1211 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1212 aarch64 with binutils 2.30 or later.
1214 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1215 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1218 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1220 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1222 * In order to support faster and safer process termination the malloc API
1223 family of functions will no longer print a failure address and stack
1224 backtrace after detecting heap corruption. The goal is to minimize the
1225 amount of work done after corruption is detected and to avoid potential
1226 security issues in continued process execution. Reducing shutdown time
1227 leads to lower overall process restart latency, so there is benefit both
1228 from a security and performance perspective.
1230 * The abort function terminates the process immediately, without flushing
1231 stdio streams. Previous glibc versions used to flush streams, resulting
1232 in deadlocks and further data corruption. This change also affects
1233 process aborts as the result of assertion failures.
1235 * On platforms where long double has the IEEE binary128 format (aarch64,
1236 alpha, mips64, riscv, s390 and sparc), the math library now implements
1237 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1238 These are the same interfaces added in version 2.26 for some platforms where
1239 this format is supported but is not the format of long double.
1241 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1242 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1243 implements interfaces for that type, as defined by ISO/IEC TS
1244 18661-3:2015. These are corresponding interfaces to those supported for
1247 * The math library now implements interfaces for the _Float32, _Float64 and
1248 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1249 corresponding interfaces to those supported for _Float128.
1251 * glibc now implements the memfd_create and mlock2 functions on Linux.
1253 * Support for memory protection keys was added. The <sys/mman.h> header now
1254 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1257 * The copy_file_range function was added.
1259 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1261 * The ldconfig utility now processes `include' directives using the C/POSIX
1262 collation ordering. Previous glibc versions used locale-specific
1263 ordering, the change might break systems that relied on that.
1265 * Support for two grammatical forms of month names has been added.
1266 In a call to strftime, the "%B" and "%b" format specifiers will now
1267 produce the grammatical form required when the month is used as part
1268 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1269 required when the month is named by itself. For instance, in Greek
1270 and in many Slavic and Baltic languages, "%B" will produce the month
1271 in genitive case, and "%OB" will produce the month in nominative case.
1273 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1274 are all valid and will all accept any known form of month
1275 name---standalone or complete, abbreviated or full. In a call to
1276 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1277 the strings used by "%B" and "%b", respectively. New query
1278 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1279 used by "%OB" and "%Ob", respectively.
1281 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1282 define the strings for %OB and %Ob, respectively; these have the
1283 same syntax as "mon" and "abmon". These arrays are optional; if they
1284 are not provided then they have the same content as "mon" and "abmon",
1287 These features are provided for locales which define "alt_mon" and/or
1288 "ab_alt_mon" in their locale source data. This release includes such
1289 alternative month name data for the following languages: Belarusian,
1290 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1292 This feature is currently a GNU extension, but it is expected to
1293 be added to the next revision of POSIX, and it is also already
1294 available on some BSD-derived operating systems.
1296 This feature will cause existing statically compiled applications
1297 to fail to load locales and fall back to the builtin C/POSIX locales.
1298 See notes below for other changes affecting compatibility.
1300 * Support for the RISC-V ISA running on Linux has been added. This port
1301 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1302 for the following ISA and ABI pairs:
1308 Deprecated and removed features, and other changes affecting compatibility:
1310 * Statically compiled applications attempting to load locales compiled for the
1311 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1312 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1313 support for two grammatical forms of the month names, also extends the locale
1314 data binary format. Static applications needing locale support must be
1315 recompiled to match the runtime and data they are deployed with. In some
1316 distributions there is an upgrade window where dynamically linked applications
1317 may use a new library but the old locale data and also fall back to the
1318 builtin C/POSIX locales; restarting the application process is sufficient to
1321 * Support for statically linked applications which call dlopen is deprecated
1322 and will be removed in a future version of glibc. Applications which call
1323 dlopen need to be linked dynamically instead.
1325 * Support for old programs which use internal stdio data structures and
1326 functions is deprecated. This includes programs which use the C++ streams
1327 provided by libstdc++ in GCC 2.95. Programs which use the internal
1328 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1329 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1330 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1331 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1332 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1333 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1334 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1335 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1336 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1337 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1338 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1339 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1340 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1341 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1342 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1343 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1344 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1345 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1346 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1347 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1348 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1349 future version of glibc. Unlike other symbol removals, these old
1350 applications will not be supported using compatibility symbols.
1352 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1353 defined by <sys/ptrace.h>.
1355 * libm no longer supports SVID error handling (calling a user-provided
1356 matherr function on error) or the _LIB_VERSION variable to control error
1357 handling. (SVID error handling and the _LIB_VERSION variable still work
1358 for binaries linked against older versions of the GNU C Library.) The
1359 libieee.a library is no longer provided. math.h no longer defines struct
1360 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1361 TLOSS, PLOSS and HUGE.
1363 * The libm functions pow10, pow10f and pow10l are no longer supported for
1364 new programs. Programs should use the standard names exp10, exp10f and
1365 exp10l for these functions instead.
1367 * The mcontext_t type is no longer the same as struct sigcontext. On
1368 platforms where it was previously the same, this changes the C++ name
1369 mangling for interfaces involving this type.
1371 * The add-ons mechanism for building additional packages at the same time as
1372 glibc has been removed. The --enable-add-ons configure option is now
1375 * The --without-fp configure option is now ignored. Whether hardware
1376 floating-point instructions are used is now configured based on whether
1377 the compiler used at configure time (without any options implied by a
1378 --with-cpu= configure option) uses such instructions.
1380 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1381 the specified string can be parsed as a domain name.
1383 * In the malloc_info output, the <heap> element may contain another <aspace>
1384 element, "subheaps", which contains the number of sub-heaps.
1386 * The libresolv function p_secstodate is no longer supported for new
1389 * The tilepro-*-linux-gnu configuration is no longer supported.
1391 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1392 and will be removed in a future release. Software that is still using
1393 either header should be updated to use standard <stdio.h> interfaces
1396 libio.h was originally the header for a set of supported GNU extensions,
1397 but they have not been maintained as such in many years, they are now
1398 standing in the way of improvements to stdio, and we don't think there are
1399 any remaining external users. _G_config.h was never intended for public
1400 use, but predates the bits convention.
1402 Changes to build and runtime requirements:
1404 * bison version 2.7 or later is required to generate code in the 'intl'
1407 Security related changes:
1409 CVE-2009-5064: The ldd script would sometimes run the program under
1410 examination directly, without preventing code execution through the
1411 dynamic linker. (The glibc project disputes that this is a security
1412 vulnerability; only trusted binaries must be examined using the ldd
1415 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1416 suffered from a one-byte overflow during ~ operator processing (either
1417 on the stack or the heap, depending on the length of the user name).
1418 Reported by Tim RĂŒhsen.
1420 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1421 would sometimes fail to free memory allocated during ~ operator
1422 processing, leading to a memory leak and, potentially, to a denial
1425 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1426 without GLOB_NOESCAPE, could write past the end of a buffer while
1427 unescaping user names. Reported by Tim RĂŒhsen.
1429 CVE-2017-17426: The malloc function, when called with an object size near
1430 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1431 instead of NULL. This was a regression introduced with the new malloc
1432 thread cache in glibc 2.26. Reported by Iain Buclaw.
1434 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1435 to the allocation of too much memory. (This is not a security bug per se,
1436 it is mentioned here only because of the CVE assignment.) Reported by
1439 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1440 of the number of search path components. (This is not a security
1441 vulnerability per se because no trust boundary is crossed if the fix for
1442 CVE-2017-1000366 has been applied, but it is mentioned here only because
1443 of the CVE assignment.) Reported by Qualys.
1445 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1446 for AT_SECURE or SUID binaries could be used to load libraries from the
1449 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1450 succeeds without returning an absolute path due to unexpected behaviour
1451 of the Linux kernel getcwd syscall. Reported by halfdog.
1453 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1454 an object size near the value of SIZE_MAX, would return a pointer to a
1455 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1457 CVE-2018-6551: The malloc function, when called with an object size near
1458 the value of SIZE_MAX, would return a pointer to a buffer which is too
1459 small, instead of NULL.
1461 The following bugs are resolved with this release:
1463 [866] glob: glob should match dangling symlinks
1464 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1465 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1467 [5997] math: Very slow execution of sinf function
1468 [10580] localedata: hr_HR: updated locale
1469 [10871] locale: 'mon' array should contain both nominative and genitive
1471 [12349] localedata: eu_ES: incorrect thousands separator
1472 [13605] localedata: shn_MM: new Shan locale
1473 [13805] localedata: ru_RU: currency should use ',' as radix point
1474 [13953] localedata: km_KH: locale update
1475 [13994] localedata: mjw_IN: new locale
1476 [14121] build: make writes .mo files in po directory
1477 [14333] libc: Fix the race between atexit() and exit()
1478 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1479 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1481 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1482 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1483 width Latin characters
1484 [15332] localedata: es_CU: locale update
1485 [15436] stdio: Don't close or flush stdio streams on abort
1486 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1488 [16148] localedata: ca_ES: incorrect thousands separator
1489 [16750] dynamic-link: ldd should not try to execute the binaries
1491 [16777] localedata: pl_PL: incorrect thousands separator in locale
1492 [16905] localedata: hanzi: new collation
1493 [17563] localedata: cmn_TW: add hanzi collation
1494 [17750] localedata: wrong collation order of diacritics in most locales
1495 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1497 [17956] build: Build fails on missing definitions from header file
1498 nss/nss.h when Mozilla NSS is used for cryptography
1499 [18203] libc: realpath() does not handle unreachable paths correctly
1500 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1501 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1502 [18822] libc: Internal functions are called via PLT
1503 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1504 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1505 [19574] libc: glibc should support building static PIE binaries
1506 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1508 [19971] glob: glob: Do not skip entries with zero d_ino values
1509 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1510 [20008] localedata: km_KH: convert to translit_neutral
1511 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1512 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1513 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1514 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1515 [20498] localedata: miq_NI: new MĂskitu / Miskito (miq) language locale
1517 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1518 they're set, wrong errors returned by gaih_inet when lookup functions
1520 [20756] localedata: [PATCH] Use Unicode wise thousands separator
1521 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1523 [20952] localedata: yuw_PG: new locale
1524 [21084] localedata: charmaps/IBM858: new codepage
1525 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1526 [21242] libc: assert gives pedantic warning in old gcc versions
1527 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1528 __regcall calling convention
1529 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1530 [21326] libc: C99 functions are not declared for C++11 and later if
1531 _GNU_SOURCE is not predefined by g++
1532 [21457] libc: sys/ucontext.h namespace
1533 [21530] libc: tmpfile() should be implemented using O_TMPFILE
1534 [21660] math: GCC fails to compile a formula with tgmath.h
1535 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1536 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1537 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1538 [21684] math: tgmath.h handling of complex integers
1539 [21685] math: tgmath.h handling of bit-fields
1540 [21686] math: tgmath.h handling of __int128
1541 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1543 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1545 [21750] localedata: column width of characters incompatible with classical
1547 [21754] malloc: malloc: Perform as little work as possible after heap
1548 consistency check failures
1549 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1550 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1551 [21791] string: Unused XXX_chk_XXX functions in libc.a
1552 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1554 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1556 [21845] localedata: Added new Locale bho_NP
1557 [21853] localedata: Fix abday Which looks same as day in zh_SG
1558 [21854] localedata: Added New Locale en_SC
1559 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1560 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1561 _dl_runtime_resolve_avx_slow
1562 [21885] network: getaddrinfo: gethosts does not release resolver context
1563 on memory allocation failure
1564 [21899] libc: XPG4.2 sigaction namespace
1565 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1567 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1569 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1570 errno value, causing getaddrinfo to fail
1571 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1572 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1573 instead of EAI_NODATA
1574 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1575 constant PTRACE_SEIZE_DEVEL
1576 [21930] math: C-only gcc builtins used in <math.h> isinf
1577 [21932] network: Unpaired __resolv_context_get in generic get*_r
1579 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1580 [21944] libc: sigval namespace
1581 [21951] localedata: Update hanzi collation by stroke
1582 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
1583 sysdeps/x86_64/fpu/e_expf.S
1584 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1585 allocation in syscall loops)
1586 [21959] localedata: Fix Country name for xh_ZA
1587 [21960] localedata: Fix abmon for bem_ZM
1588 [21966] math: AVX2 mathvec functions use FMA without checking
1589 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1590 [21971] localedata: Added New Locale for mfe_MU
1591 [21972] libc: assert macro requires operator== (int) for its argument type
1592 [21973] math: [sparc] libm missing sqrtl compat symbol
1593 [21974] libc: Remove __bb_init_func and __bb_exit_func
1594 [21982] string: stratcliff.c: error: assuming signed overflow does not
1596 [21986] stdio: __guess_grouping is called incorrectly
1597 [21987] math: [sparc32] wrong bits/long-double.h installed
1598 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1600 [22022] localedata: Missing country_name for mni_IN
1601 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1603 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1605 [22026] locale: iconv_open: heap overflow on gconv_init failure
1606 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1607 [22035] math: [m68k] bits/math-inline.h macro namespace
1608 [22038] localedata: Fix abbreviated weeks and months for Somali
1609 [22044] localedata: Remove redundant data for Limburgish Language
1610 [22050] malloc: Linking with -lmcheck does not hook
1611 __malloc_initialize_hook correctly
1612 [22051] libc: zero terminator in the middle of glibc's .eh_frame
1613 [22052] malloc: malloc failed to compile with GCC 7 and -O3
1614 [22070] localedata: charmaps/UTF-8: wcwidth for
1615 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1616 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1617 Jungseong and Jongseong) should be 0
1618 [22078] nss: nss_files performance issue in multi mode
1619 [22082] math: bits/math-finite.h exp10 condition
1620 [22086] libc: pcprofiledump incorrect cross-endian condition
1621 [22093] dynamic-link: ld.so no longer searches in .../x86_64
1622 [22095] network: Name server address allocation memory leak in resolv.conf
1624 [22096] network: __resolv_conf_attach can incorrectly free passed conf
1626 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1627 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1629 [22111] malloc: malloc: per thread cache is not returned when thread exits
1630 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1631 [22134] libc: [linux] implement fexecve with execveat
1632 [22142] libc: [powerpc] printf oupts a wrong value of DBL_MAX on ppc64 and
1634 [22145] libc: ttyname() gives up too early in the face of namespaces
1635 [22146] math: C++ build issue with float128 on x86_64
1636 [22153] nptl: nptl: save error code before process termination
1637 [22156] libc: [hppa,ia64,microblaze] Executable stack default
1638 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1639 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1640 [22165] libc: [hppa] Text relocations in libc.so
1641 [22180] libc: destructor registered via __cxa_atexit is called twice
1642 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1643 symlinks") cause "make" segfaults
1644 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1646 [22207] libc: FAIL: stdlib/test-atexit-race
1647 [22225] math: nearbyint arithmetic moved before feholdexcept
1648 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1649 [22235] math: iscanonical in C++ and float128
1650 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1651 the svid compat wrapper
1652 [22244] math: ynf and yn are wrong without the svid compat wrapper
1653 [22273] libc: Improper assert in Linux posix_spawn implementation
1654 [22284] libc: -pg -pie doesn't work
1655 [22292] locale: localedef exits with error 4 when it should be error 1
1656 [22294] locale: Allow "" for int_currency_symbol definition in locales.
1657 [22295] locale: Don't warn on non-symbolic characters in locale sources in
1659 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1660 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1662 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1663 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1664 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1665 [22322] libc: [mips64] wrong bits/long-double.h installed
1666 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1667 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1669 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1670 [22343] malloc: Integer overflow in posix_memalign
1671 [22347] libc: getrandom() returns the number of bytes that were copied to
1672 the buffer even though the comments say "Return 0 on success and -1 on
1674 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1675 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1677 [22370] dynamic-link: Incorrect note padding check
1678 [22375] libc: malloc returns pointer from tcache_get when should return
1679 NULL (CVE-2017-17426)
1680 [22377] math: iseqsig, float128 and C++
1681 [22382] localedata: Error in tpi_PG locale
1682 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1683 inside the ASCII printable range
1684 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1686 [22403] localedata: Slash needs escaping in some locales
1687 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1688 [22409] network: res_hnok does not accept some host names used on the
1690 [22412] network: res_dnok, res_hnok should perform syntax checks
1691 [22413] network: ns_name_pton ignores syntactically invalid trailing
1693 [22415] stdio: setvbuf can lead to invalid free/segfault
1694 [22432] build: Non-deterministic build
1695 [22439] malloc: malloc_info should compute summary statistics for all sub-
1697 [22442] network: if_nametoindex could report index for the wrong
1698 networking interface
1699 [22446] build: aliasing violation calling readlink in handle_request
1700 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
1701 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
1702 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
1703 __nscd_hash/__nss_hash
1704 [22463] network: p_secstodate overflow handling
1705 [22469] localedata: pl_PL LC_COLLATE does not use i18n
1706 [22478] libc: sigwait can fail with EINTR
1707 [22505] libc: ldconfig processes include directive in locale-specific
1709 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
1710 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
1711 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
1712 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
1713 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
1714 [22534] localedata: Collation rules for Serbian and Bosnian should be the
1715 same as for Croatian
1716 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
1717 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
1718 [22577] libc: missing newline after "cannot allocate TLS data structures
1720 [22588] manual: manual/conf.texi: missing underscore in front of
1722 [22593] math: nextafter and nexttoward are declared with const attribute
1723 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
1724 [22603] string: ia64 memchr overflows internal pointer check
1725 [22605] libc: SH clone does not set the exit code correctly
1726 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
1728 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
1729 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
1730 modified in case of success
1731 [22614] build: gcc: error: unrecognized command line option â-no-pieâ
1732 [22615] manual: manual: ambiguous wording about errno value in case of
1734 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
1736 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
1737 binaries or if /proc is not mounted (CVE-2017-16997)
1738 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
1739 [22630] build: $(no-pie-ldflag) is no longer effective
1740 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
1741 [22635] nptl: pthread_self returns NULL before libpthread is loaded
1742 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
1743 [22637] nptl: guard size is subtracted from thread stack size instead of
1745 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
1746 [22657] localedata: hu_HU: Avoid double space in date
1747 [22660] math: fmax, fmin sNaN handling on alpha
1748 [22664] libc: New warning of GCC8
1749 [22665] math: alpha: ceil and floor raise inexact exceptions
1750 [22666] math: alpha: trunc raise inexact exceptions
1751 [22667] libc: makecontext lacks stack alignment on i386
1752 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
1753 [22679] libc: getcwd(3) can succeed without returning an absolute path
1755 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
1756 elision and tunables
1757 [22687] math: [powerpc-nofpu] complex long double functions spurious
1759 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
1760 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
1761 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
1763 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
1764 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
1766 [22701] nis: Incomplete removal of libnsl
1767 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
1768 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
1769 [22715] dynamic-link: FAIL: elf/tst-audit10
1770 [22719] libc: Backtrace tests fail on hppa
1771 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
1772 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
1773 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
1774 before the first call to crypt_r () in crypt/badsalttest.c
1781 * A per-thread cache has been added to malloc. Access to the cache requires
1782 no locks and therefore significantly accelerates the fast path to allocate
1783 and free small amounts of memory. Refilling an empty cache requires locking
1784 the underlying arena. Performance measurements show significant gains in a
1785 wide variety of user workloads. Workloads were captured using a special
1786 instrumented malloc and analyzed with a malloc simulator. Contributed by
1787 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
1789 * Unicode 10.0.0 Support: Character encoding, character type info, and
1790 transliteration tables are all updated to Unicode 10.0.0, using
1791 generator scripts contributed by Mike FABIAN (Red Hat).
1792 These updates cause user visible changes, especially the changes in
1793 wcwidth for many emoji characters cause problems when emoji sequences
1794 are rendered with pango, see for example:
1795 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
1797 * Collation of Hungarian has been overhauled and is now consistent with "The
1798 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
1801 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
1803 - The GNU C Library will now detect when /etc/resolv.conf has been
1804 modified and reload the changed configuration. The new resolver option
1805 âno-reloadâ (RES_NORELOAD) disables this behavior.
1807 - The GNU C Library now supports an arbitrary number of search domains
1808 (configured using the âsearchâ directive in /etc/resolv.conf);
1809 previously, there was a hard limit of six domains. For backward
1810 compatibility, applications that directly modify the â_resâ global
1811 object are still limited to six search domains.
1813 - When the ârotateâ (RES_ROTATE) resolver option is active, the GNU C
1814 Library will now randomly pick a name server from the configuration as a
1815 starting point. (Previously, the second name server was always used.)
1817 * The tunables feature is now enabled by default. This allows users to tweak
1818 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
1820 * New function reallocarray, which resizes an allocated block (like realloc)
1821 to the product of two sizes, with a guaranteed clean failure upon integer
1822 overflow in the multiplication. Originally from OpenBSD, contributed by
1823 Dennis Wölfing and RĂŒdiger Sonderfeld.
1825 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
1826 These are extended versions of preadv and pwritev, respectively, taking an
1827 additional flags argument. The set of supported flags depends on the
1828 running kernel; full support currently requires kernel 4.7 or later.
1830 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
1831 create a new session ID for the spawned process. This feature is
1832 scheduled to be added to the next major revision of POSIX; for the time
1833 being, it is available under _GNU_SOURCE.
1835 * errno.h is now safe to use from C-preprocessed assembly language on all
1836 supported operating systems. In this context, it will only define the
1837 Exxxx constants, as preprocessor macros expanding to integer literals.
1839 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
1840 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
1841 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
1842 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
1844 To compile programs that use this feature, the compiler must support
1845 128-bit floating point with the type name _Float128 (as defined by TS
1846 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
1847 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
1848 must be defined to make the new interfaces visible.
1850 The new functions and macros correspond to those present for other
1851 floating-point types (except for a few obsolescent interfaces not
1852 supported for the new type), with F128 or f128 suffixes; for example,
1853 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
1854 printf or scanf formats for the new type; the strfromf128 and strtof128
1855 interfaces should be used instead.
1857 Deprecated and removed features, and other changes affecting compatibility:
1859 * The synchronization that pthread_spin_unlock performs has been changed to
1860 now be equivalent to a C11 atomic store with release memory order to the
1861 spin lock's memory location. Previously, several (but not all)
1862 architectures used stronger synchronization (e.g., containing what is
1863 often called a full barrier). This change can improve performance, but
1864 may affect odd fringe uses of spin locks that depend on the previous
1865 behavior (e.g., using spin locks as atomic variables to try to implement
1866 Dekker's mutual exclusion algorithm).
1868 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
1871 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
1872 will only be built and installed when the GNU C Library is configured with
1873 --enable-obsolete-rpc. This allows alternative RPC implementations, such
1874 as TIRPC or rpcsvc-proto, to be used.
1876 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
1877 libnss_compat, are deprecated, and will not be built or installed by
1880 The NIS(+) support library, libnsl, is also deprecated. By default, a
1881 compatibility shared library will be built and installed, but not headers
1882 or development libraries. Only a few NIS-related programs require this
1883 library. (In particular, the GNU C Library has never required programs
1884 that use 'gethostbyname' to be linked with libnsl.)
1886 Replacement implementations based on TIRPC, which additionally support
1887 IPv6, are available from <https://github.com/thkukuk/>. The configure
1888 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
1889 name service modules, to be built and installed.
1891 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
1892 support is enabled, the configured recursive resolver must support EDNS.
1893 (Responding to EDNS-enabled queries with responses which are not
1894 EDNS-enabled is fine, but FORMERR responses are not.)
1896 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
1897 servers have not supported this opcode for a long time.
1899 * The _res_opcodes variable has been removed from libresolv. It had been
1900 exported by accident.
1902 * <string.h> no longer includes inline versions of any string functions,
1903 as this kind of optimization is better done by the compiler. The macros
1904 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
1906 * The nonstandard header <xlocale.h> has been removed. Most programs should
1907 use <locale.h> instead. If you have a specific need for the definition of
1908 locale_t with no other declarations, please contact
1909 libc-alpha@sourceware.org and explain.
1911 * The obsolete header <sys/ultrasound.h> has been removed.
1913 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
1915 * The obsolete function cfree has been removed. Applications should use
1918 * The stack_t type no longer has the name struct sigaltstack. This changes
1919 the C++ name mangling for interfaces involving this type.
1921 * The ucontext_t type no longer has the name struct ucontext. This changes
1922 the C++ name mangling for interfaces involving this type.
1924 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
1925 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
1926 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
1927 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
1928 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
1929 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
1930 fpregset_t type no longer has the name struct fpu. This changes the C++
1931 name mangling for interfaces involving those types.
1933 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
1934 synced with the kernel:
1936 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
1937 are not supported on this architecture and have been removed.
1939 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
1940 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
1941 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
1943 Programs that assume the GET/SETREGS ptrace requests are universally
1944 available will now fail to build, instead of malfunctioning at runtime.
1946 Changes to build and runtime requirements:
1948 * Linux kernel 3.2 or later is required at runtime, on all architectures
1949 supported by that kernel. (This is a change from version 2.25 only for
1952 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
1954 * On most architectures, GCC 4.9 or later is required to build the GNU C
1955 Library. On powerpc64le, GCC 6.2 or later is required.
1957 Older GCC versions and non-GNU compilers are still supported when
1958 compiling programs that use the GNU C Library. (We do not know exactly
1959 how old, and some GNU extensions to C may be _de facto_ required. If you
1960 are interested in helping us make this statement less vague, please
1961 contact libc-alpha@sourceware.org.)
1963 Security related changes:
1965 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
1966 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
1968 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
1969 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
1971 * Avoid printing a backtrace from the __stack_chk_fail function since it is
1972 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
1975 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
1976 fixed (CVE-2017-12133).
1978 The following bugs are resolved with this release:
1980 [984] network: Respond to changed resolv.conf in gethostbyname
1981 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
1982 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
1984 [12189] libc: __stack_chk_fail should not attempt a backtrace
1986 [14096] time: Race condition on timezone/tst-timezone.out
1987 [14172] localedata: az_IR: new locale
1988 [14995] build: glibc fails to build if gold is the default linker, even if
1990 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
1991 [16637] network: inet_pton function is accepting IPv6 with bad format
1992 [16640] string: string/strtok.c: undefined behaviour inconsistent between
1993 x86 and other generic code
1994 [16875] localedata: ko_KR: fix lang_name
1995 [17225] localedata: ar_SY: localized month names for May and June are
1997 [17297] localedata: da_DK: wrong date_fmt string
1998 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
1999 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2000 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2001 [19066] localedata: ar_SA abbreviated day and month names are in English
2002 [19569] network: resolv: Support an arbitrary number of search domains
2003 [19570] network: Implement random DNS server selection in the stub
2005 [19838] locale: localedef fails on PA-RISC
2006 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2007 order of 0D36 and 0D37
2008 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2010 [20098] libc: FAIL: debug/backtrace-tst on hppa
2011 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2013 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2015 [20313] localedata: Update locale data to Unicode 9.0
2016 [20424] manual: Document how to provide a malloc replacement
2017 [20496] localedata: agr_PE: new language locale AwajĂșn / Aguaruna (agr)
2019 [20686] locale: Add el_GR@euro to SUPPORTED.
2020 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2021 failures consistently
2022 [21015] dynamic-link: Document and fix --enable-bind-now
2023 [21016] nptl: pthread_cond support is broken on hppa
2024 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2025 frame-pointer on i386
2026 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2028 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2029 [21088] libc: Build fails with --enable-static-nss
2030 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2031 generic c code is used
2032 [21109] libc: Tunables broken on big-endian
2033 [21112] math: powf has large ulp errors with base close to 1 and exponent
2035 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2037 [21120] malloc: glibc malloc is incompatible with GCC 7
2038 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2040 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2041 (-0.0) when linking with -lieee
2042 [21171] math: log10, log2 and lgamma return incorrect results
2043 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2044 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2045 [21207] localedata: ce_RU: update weekdays from CLDR
2046 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2047 [21217] localedata: Update months from CLDR-31
2048 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2049 [21243] libc: support_delete_temp_file should issue warning for failed
2051 [21244] libc: support resolv_test_start() socket fd close should be
2053 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2054 new posix_spawn implementation
2055 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2056 leads to lower CPU frequency
2057 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2058 [21261] libc: [sparc64] bits/setjmp.h namespace
2059 [21267] network: [mips] bits/socket.h IOC* namespace
2060 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2061 [21270] libc: mmap64 silently truncates large offset values
2062 [21275] libc: posix_spawn always crashes on ia64 now
2063 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2064 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2065 [21289] libc: Incorrect declaration for 32-bit platforms with
2066 _FILE_OFFSET_BITS=64 causes build error
2067 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2068 not support gethostbyname4_r
2069 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2071 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2073 [21340] libc: Support POSIX_SPAWN_SETSID
2074 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2075 [21359] network: ns_name_pack needs additional byte in destination buffer
2076 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2077 against fragmentation attacks (CVE-2017-12132)
2078 [21369] network: resolv: Remove EDNS fallback
2079 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2081 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2082 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2083 [21393] stdio: Missing dup3 error check in freopen, freopen64
2084 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2085 [21399] localedata: Bad description for U00EC in
2086 localedata/charmaps/CP1254
2087 [21411] malloc: realloc documentation error
2088 [21426] network: sys/socket.h uio.h namespace
2089 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2090 [21445] libc: signal.h bsd_signal namespace
2091 [21455] network: Network headers stdint.h namespace
2092 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2094 [21475] network: resolv: Overlong search path is truncated mid-label
2095 [21511] libc: sigstack namespace
2096 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2097 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2098 bits/syscall.h: No such file or directory
2099 [21517] libc: struct sigaltstack namespace
2100 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2101 [21533] localedata: Update locale data to Unicode 10.0
2103 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2104 junk at end of line, first unrecognized character is `@'
2105 [21538] libc: SIG_HOLD missing for XPG4
2106 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2107 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2108 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2109 [21543] libc: sigevent namespace
2110 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2111 size for general purpose registers in mcontext_t structure
2112 [21550] libc: sigwait namespace
2113 [21552] libc: XPG4 bsd_signal namespace
2114 [21554] libc: sigpause namespace
2115 [21560] libc: sys/wait.h signal.h namespace
2116 [21561] libc: waitid namespace
2117 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2118 '/usr/include/stdlib.h': Permission denied
2119 [21575] libc: sys/wait.h missing struct rusage definition
2120 [21584] libc: sigaltstack etc namespace
2121 [21597] libc: siginterrupt namespace
2122 [21607] math: hppa: FAIL: math/test-tgmath
2123 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2125 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2126 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2127 stack and heap (CVE-2017-1000366)
2128 [21625] libc: wait3 namespace
2129 [21654] nss: Incorrect pointer alignment in NSS group merge result
2131 [21657] network: Parse interface zone id for node-local multicast
2132 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2134 [21666] libc: .symver is used on common symbol
2135 [21668] network: resolv: res_init cross-thread broadcast introduces race
2137 [21687] math: tgmath.h totalorder, totalordermag return type
2138 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2140 [21696] libc: Incorrect assumption of of __cpu_mask in
2141 posix/sched_cpucount.c
2142 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2143 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2145 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2146 leading to relocation crash
2147 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2148 `resolv_conf_matches (resp, conf)' failed.
2149 [21710] localedata: Added Samoan language locale for Samoa
2150 [21711] localedata: Pashto yesstr/nostr locale are missing
2151 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2152 __have_pthread_attr_t can cause redefinition of typedef âpthread_attr_tâ
2153 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2154 [21723] localedata: yesstr/nostr missing for Chinese language locale
2155 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2157 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2159 [21728] localedata: New Locale for Tongan language
2160 [21729] localedata: incorrect LC_NAME fields for hi_IN
2161 [21733] localedata: yesstr and nostr are missing for zh_HK
2162 [21734] localedata: Missing yesstr and nostr are for kw_GB
2163 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2164 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2165 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2166 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2168 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2170 [21749] localedata: Wrong abbreviated day name (âabdayâ) for
2172 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2173 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2174 [21759] localedata: missing yesstr and nostr for Tigrinya
2175 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2176 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2177 [21767] localedata: Missing Bislama locales
2178 [21768] localedata: Missing yesstr and nostr for aa_ET
2179 [21770] localedata: Missing Field in li_NL
2180 [21778] nptl: Robust mutex may deadlock
2181 [21779] libc: MicroBlaze segfaults when loading libpthread
2182 [21783] localedata: Fix int_select international_call_prefixes
2183 [21784] localedata: Inconsistency in country_isbn
2184 [21788] localedata: Missing Country Postal Abbreviations
2185 [21794] localedata: Added-country_isbn-for-Italy
2186 [21795] localedata: Add/Fix country_isbn for France
2187 [21796] localedata: Added country_isbn for Republic of Korea
2188 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2189 [21799] localedata: Added int_select international_call_prefixes
2190 [21801] localedata: Added int_select international_call_prefixes
2191 [21804] nptl: Double semicolon in thread-shared-types.h
2192 [21807] localedata: LC_ADDRESS fix for pap_CW
2193 [21808] localedata: Fix LC_ADDRESS for pap_AW
2194 [21821] localedata: Added country_name in mai_IN
2195 [21822] localedata: Fix LC_TIME for mai_IN
2196 [21823] localedata: missing yesstr, nostr for sa_IN
2197 [21825] localedata: Fix name_mrs for mag_IN
2198 [21828] localedata: 2.26 changelog should mention user visible changes
2200 [21835] localedata: Added Maithili language locale for Nepal
2201 [21838] localedata: Removed redundant data for the_NP
2202 [21839] localedata: Fix LC_MONETARY for ta_LK
2203 [21844] localedata: Fix Latin characters and Months Sequence.
2204 [21848] localedata: Fix mai_NP Title Name
2209 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2210 24731-2:2010, is supported to enable declarations of functions from that
2211 TR. Note that not all functions from that TR are supported by the GNU C
2214 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2215 18661-1:2014, is supported to enable declarations of functions and macros
2216 from that TS. Note that not all features from that TS are supported by
2219 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2220 18661-4:2015, is supported to enable declarations of functions and macros
2221 from that TS. Note that most features from that TS are not supported by
2224 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2225 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2226 Since the GNU C Library defaults to a much newer revision of POSIX, this
2227 will only affect programs that specifically request an old conformance
2228 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2229 see a change in the visible declarations, but a program compiled with
2230 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2233 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2234 defined by all multithreaded code, but glibc has not required this for
2237 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2238 means that in a future release, the macros âmajorâ, âminorâ, and âmakedevâ
2239 will only be available from <sys/sysmacros.h>.
2241 These macros are not part of POSIX nor XSI, and their names frequently
2242 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2243 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2244 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2247 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2248 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2249 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2251 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2252 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2253 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2254 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2255 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2256 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2257 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2258 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2259 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2260 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2261 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2264 * New <math.h> features are added from TS 18661-1:2014:
2266 - Signaling NaN macros: SNANF, SNAN, SNANL.
2268 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2269 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2270 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2272 - llogb functions: the llogb, llogbf and llogbl functions, and the
2273 FP_LLOGB0 and FP_LLOGBNAN macros.
2275 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2278 - Comparison macros: iseqsig.
2280 - Classification macros: iscanonical, issubnormal, iszero.
2282 - Total order functions: totalorder, totalorderf, totalorderl,
2283 totalordermag, totalordermagf, totalordermagl.
2285 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2287 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2288 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2290 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2291 are added to libc. They convert a floating-point number into string.
2293 * Most of glibc can now be built with the stack smashing protector enabled.
2294 It is recommended to build glibc with --enable-stack-protector=strong.
2295 Implemented by Nick Alcock (Oracle).
2297 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2298 intended to be used instead of memset() to erase sensitive data after use;
2299 the compiler will not optimize out calls to explicit_bzero even if they
2300 are "unnecessary" (in the sense that no _correct_ program can observe the
2301 effects of the memory clear).
2303 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2304 to float instead of double. This does not affect the ABI of any libraries
2305 that are part of the GNU C Library, but may affect the ABI of other
2306 libraries that use this type in their interfaces.
2308 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2309 float_t and double_t types are now defined to long double instead of float
2310 and double. These options are not the default, and this does not affect
2311 the ABI of any libraries that are part of the GNU C Library, but it may
2312 affect the ABI of other libraries that use this type in their interfaces,
2313 if they are compiled or used with those options.
2315 * The getentropy and getrandom functions, and the <sys/random.h> header file
2318 * The buffer size for byte-oriented stdio streams is now limited to 8192
2319 bytes by default. Previously, on Linux, the default buffer size on most
2320 file systems was 4096 bytes (and thus remains unchanged), except on
2321 network file systems, where the buffer size was unpredictable and could be
2322 as large as several megabytes.
2324 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2325 for the Linux quota interface which predates kernel version 2.4.22 has
2328 * The malloc_get_state and malloc_set_state functions have been removed.
2329 Already-existing binaries that dynamically link to these functions will
2330 get a hidden implementation in which malloc_get_state is a stub. As far
2331 as we know, these functions are used only by GNU Emacs and this change
2332 will not adversely affect already-built Emacs executables. Any undumped
2333 Emacs executables, which normally exist only during an Emacs build, should
2334 be rebuilt by re-running â./configure; makeâ in the Emacs build tree.
2336 * The âip6-dotintâ and âno-ip6-dotintâ resolver options, and the
2337 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2338 âno-ip6-dotintâ had already been the default, and support for the
2339 âip6-dotintâ option was removed from the Internet in 2006.
2341 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2342 flag from <resolv.h> have been removed. The option relied on a
2343 backwards-incompatible DNS extension which was never deployed on the
2346 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2347 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2348 They were already unimplemented.
2350 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2351 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2352 removed again from the IETF name lookup interface specification in RFC
2353 2553. Applications should use getaddrinfo instead.
2355 * DNSSEC-related declarations and definitions have been removed from the
2356 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2357 decode the data part of DNSSEC record types. Previous versions of glibc
2358 only implemented minimal support for the previous version of DNSSEC, which
2359 is incompatible with the currently deployed version.
2361 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2362 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2363 <arpa/nameser.h> header file because the distinction between RR types and
2364 meta-RR types is not officially standardized, subject to revision, and
2365 thus not suitable for encoding in a macro.
2367 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2368 and rhook members of the res_state type in <resolv.h> have been removed.
2369 The glibc stub resolver did not support these hooks, but the header file
2370 did not reflect that.
2372 * For multi-arch support it is recommended to use a GCC which has
2373 been built with support for GNU indirect functions. This ensures
2374 that correct debugging information is generated for functions
2375 selected by IFUNC resolvers. This support can either be enabled by
2376 configuring GCC with '--enable-gnu-indirect-function', or by
2377 enabling it by default by setting 'default_gnu_indirect_function'
2378 variable for a particular architecture in the GCC source file
2381 * GDB pretty printers have been added for mutex and condition variable
2382 structures in POSIX Threads. When installed and loaded in gdb these pretty
2383 printers show various pthread variables in human-readable form when read
2384 using the 'print' or 'display' commands in gdb.
2386 * Tunables feature added to allow tweaking of the runtime for an application
2387 program. This feature can be enabled with the '--enable-tunables' configure
2388 flag. The GNU C Library manual has details on usage and README.tunables has
2389 instructions on adding new tunables to the library.
2391 * A new version of condition variables functions have been implemented in
2392 the NPTL implementation of POSIX Threads to provide stronger ordering
2395 * A new version of pthread_rwlock functions have been implemented to use a more
2396 scalable algorithm primarily through not using a critical section anymore to
2399 Security related changes:
2401 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2402 have been created with makecontext could fail to terminate due to a
2403 missing .cantunwind annotation. This has been observed to lead to a hang
2404 (denial of service) in some Go applications compiled with gccgo. Reported
2405 by Andreas Schwab. (CVE-2016-6323)
2407 * The DNS stub resolver functions would crash due to a NULL pointer
2408 dereference when processing a query with a valid DNS question type which
2409 was used internally in the implementation. The stub resolver now uses a
2410 question type which is outside the range of valid question type values.
2413 The following bugs are resolved with this release:
2415 [4099] stdio: Overly agressive caching by stream i/o functions.
2416 [7065] build: Support building glibc with -fstack-protector or -fstack-
2418 [9842] localedata: en_CA: incorrect date format
2419 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2420 before it started waiting
2421 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2422 [15765] nptl: sem_open is wrongly a cancellation point
2423 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2424 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2426 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2427 library linked with pthread
2428 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2429 "FIXME: Ingo" issue)
2430 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2431 [17252] libc: getrandom and getentropy syscall
2432 [17730] malloc: thread-local storage is sometimes improperly free()'d
2433 after being __libc_memalign()'d
2434 [18241] stdio: failed fseek on memstream does not set errno and can fail
2436 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2438 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2439 PTHREAD_PRIO_INHERIT mutex on ARM
2440 [18784] network: res_query and related function crash for special record
2441 type queries (CVE-2015-5180)
2442 [19380] math: strtod does not raise "inexact"
2443 [19387] string: Integer overflow in memchr
2444 [19390] string: Integer overflow in strncat
2445 [19398] build: linknamespace tests fail with massively parallel build
2446 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2448 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2449 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2450 [19514] libc: [PATCH] Fix spelling errors in spelling
2451 "implement"/"implementation" in several places
2452 [19582] network: Deprecate RES_USE_INET6
2453 [19673] manual: clog10 docs appear to be erroneous
2454 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2455 causes a segmentation fault
2456 [19826] libc: invalid pointer returned from __tls_get_addr with static
2458 [20016] network: resolv: Remove hooks support from the API
2459 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2461 [20033] math: [x86_64] vectorized math function don't call the __finite
2463 [20116] nptl: use after free in pthread_create
2464 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2465 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2467 [20311] nptl: please install proc_service.h
2468 [20366] libc: Compilation errors in installed headers in strict-compliance
2470 [20370] malloc: malloc: Arena free list management is still racy
2471 (incorrect fix in bug 19243)
2472 [20386] libc: assert (X = 0) does not result in GCC warning
2473 [20432] malloc: malloc: Minimize interface required for interposition
2474 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2475 in _Unwind_Backtrace (CVE-2016-6323)
2476 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2477 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2479 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2480 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2481 [20477] network: resolv: incorrect double-checked locking related to
2483 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2485 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2487 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2488 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2489 cause transition penalty
2490 [20517] math: sparcv9 missing fdiml compat symbol
2491 [20524] manual: strverscmp is inconsistent
2492 [20525] libc: <sys/quota.h> should be based on kernel headers
2493 [20539] math: GCC 7 -static -lm fails to link at -O3
2494 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2496 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2498 [20591] network: Remove obsolete DNSSEC support
2499 [20592] network: DNS resource record type classification macros in
2500 <arpa/nameser.h> are incorrect
2501 [20593] network: Update DNS RR type definitions
2502 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2503 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2505 [20629] network: libresolv: Remove support for bitstring labels
2507 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2508 assertion: "maxidx >= 2"
2509 [20660] math: [arm] Use VSQRT
2510 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2511 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2512 [20689] libc: Test for FMA should also check for AVX.
2513 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2514 [20715] math: iszero macro breaks existing code
2515 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2516 [20728] libc: powerpc: Missing TOC stub in clone
2517 [20729] build: glibc-2.24 fails to build for i486 with -Os
2518 [20750] build: Build fails with default PIE enabled gcc-6.x
2519 [20768] math: [alpha] sqrt fegetenv namespace
2520 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2522 [20787] math: float_t is defined as float incorrectly on x86_64 even if
2523 __FLT_EVAL_METHOD__ is 2
2524 [20790] network: rpcgen buffer overrun in get_prog_declaration
2525 [20822] nptl: race condition in __lll_unlock_elision on powerpc
2526 [20829] libc: crypt snprintf namespace
2527 [20847] libc: tst-vfork3 failure
2528 [20855] math: Default bits/mathdef.h has inappropriate float_t
2529 [20859] math: [sh4] FP_ILOGB0 invalid
2530 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2531 U+20AC), not same as GBK
2532 [20915] dynamic-link: global-dynamic TLS broken on aarch64
2533 [20916] math: pow handling of sNaN arguments
2534 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2535 [20919] math: Bad pow (qNaN, 0) result with -lieee
2536 [20940] math: hypot sNaN handling
2537 [20947] math: fmax, fmin sNaN handling
2538 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2539 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2541 [20971] string: powerpc64/power7 memchr overflows internal pointer check
2542 [20973] nptl: robust mutexes: Lost wake-ups
2543 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2544 [20978] nis: strlen on null pointer in nss_nisplus
2545 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2547 [21014] string: i686 memchr overflows internal pointer check
2548 [21019] libc: [mips] n32 lseek incorrect on overflow
2549 [21022] libc: [microblaze] __backtrace get_frame_size namespace
2550 [21026] libc: [MIPS] readahead syscall is broken on n64
2551 [21028] math: Fallback fesetexceptflag should always succeed
2552 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2553 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2555 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2556 [21061] librt: [microblaze] librt lost clock_* exports
2557 [21073] libc: tunables: insecure environment variables passed to
2558 subprocesses with AT_SECURE
2559 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2563 * The minimum Linux kernel version that this version of the GNU C Library
2564 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2565 kernel version 2.6.32 or later suffices (on architectures that already
2566 required kernel versions more recent than 3.2, those requirements remain
2567 unchanged). Linux 3.2 or later kernel headers are required on all
2570 * The pap_AN locale has been deleted. This has been deprecated for a long
2571 time. It has been replaced by pap_AW & pap_CW, both of which have long
2572 been included in previous releases.
2574 * The readdir_r and readdir64_r functions have been deprecated. It is
2575 recommended to use readdir and readdir64 instead.
2577 * The type âunion waitâ has been removed. It was deprecated in the early
2578 1990s and never part of POSIX. Application code should use the int type
2579 instead of âunion waitâ.
2581 * A new NSS action is added to facilitate large distributed system
2582 administration. The action, MERGE, allows remote user stores like LDAP
2583 to be merged into local user stores like /etc/groups in order to provide
2584 easy to use, updated, and managed sets of merged credentials. The new
2585 action can be used by configuring it in /etc/nsswitch.conf:
2586 group: files [SUCCESS=merge] nis
2587 Implemented by Stephen Gallagher (Red Hat).
2589 * The deprecated __malloc_initialize_hook variable has been removed from the
2592 * The long unused localedef --old-style option has been removed. It hasn't
2593 done anything in over 16 years. Scripts using this option can safely
2596 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2597 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
2598 return the next representable value in the direction of positive infinity
2599 and the nextdown functions return the next representable value in the
2600 direction of negative infinity. These are currently enabled as GNU
2603 Security related changes:
2605 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
2606 could result in a stack overflow when getnetbyname was called with an
2607 overly long name. (CVE-2016-3075)
2609 * Previously, getaddrinfo copied large amounts of address data to the stack,
2610 even after the fix for CVE-2013-4458 has been applied, potentially
2611 resulting in a stack overflow. getaddrinfo now uses a heap allocation
2612 instead. Reported by Michael Petlan. (CVE-2016-3706)
2614 * The glob function suffered from a stack-based buffer overflow when it was
2615 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2616 Reported by Alexander Cherepanov. (CVE-2016-1234)
2618 * The Sun RPC UDP client could exhaust all available stack space when
2619 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
2620 alloca plugin for GCC. (CVE-2016-4429)
2622 * The IPv6 name server management code in libresolv could result in a memory
2623 leak for each thread which is created, performs a failing naming lookup,
2624 and exits. Over time, this could result in a denial of service due to
2625 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
2627 The following bugs are resolved with this release:
2629 [1170] localedata: ne_NP: update Nepali locale definition file
2630 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2632 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2633 [6796] math: fdim() does not set errno on overflow
2634 [10354] libc: posix_spawn should use vfork() in more cases than presently
2635 [11213] localedata: localedata: add copyright disclaimer to locale files
2636 [12143] localedata: chr_US: new Cherokee locale
2637 [12450] localedata: sgs_LT: new locale
2638 [12676] localedata: ln_CD: new locale
2639 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2641 [13304] math: fma, fmaf, fmal produce wrong results
2642 [14259] build: --localedir arg to configure is ignored
2643 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2644 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2645 [14934] localedata: es_CL: wrong first weekday chilean locale
2646 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2648 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2650 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2651 [15368] nptl: raise() is not async-signal-safe
2652 [15479] math: ceil, floor, round and trunc raise inexact exception
2653 [15578] localedata: kk_KZ: various updates
2654 [16003] localedata: pap_AN: punt old locale
2655 [16137] localedata: iw_IL: punt old locale
2656 [16190] localedata: eo: new esperanto locale
2657 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2658 [16742] malloc: race condition: pthread_atfork() called before first
2659 malloc() results in unexpected locking behaviour/deadlocks
2660 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2662 [16983] localedata: postal_fmt does not allow %l and %n modifiers
2663 [17565] localedata: pt_PT: wrong (work-)week start
2664 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2665 [17950] build: Build fails with -msse
2666 [18205] localedata: be_BY*: wrong first_weekday and first_workday
2667 [18433] libc: posix_spawn does not return correctly upon failure to
2669 [18453] localedata: charmaps/IBM875: incorrect codes
2670 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2672 [18896] localedata: he_IL: improvements for currency
2673 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2674 Romanian locale data
2675 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2677 [19056] libc: Deprecate readdir_r
2678 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2680 [19198] localedata: nl_NL: small improvements for Dutch locales
2681 [19257] network: Per-thread memory leak in __res_vinit with IPv6
2682 nameservers (CVE-2016-5417)
2683 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2685 [19400] locale: Language missing in "iso-639.def", trivial fix in
2687 [19431] malloc: Deadlock between fflush, getdelim, and fork
2688 [19505] libc: Incorrect file descriptor validity checks in
2689 posix_spawn_file_actions_add{open,close,dup2}
2690 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2691 when using RTLD_NEXT
2692 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2693 `intl/{gettextP,loadinfo}.h'
2694 [19534] libc: execle, execlp may use malloc
2695 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
2696 [19573] network: res_nclose and __res_maybe_init disagree about name
2697 server initialization, breaking Hesiod
2698 [19575] localedata: Status of GB18030 tables
2699 [19581] localedata: sr_* date_fmt string contains additional newline
2700 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
2702 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
2703 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
2704 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
2705 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
2707 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
2709 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
2711 [19610] dynamic-link: ldconfig -X removes stale symbolic links
2712 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
2713 [19633] locale: strfmon_l applies global locale to number formatting
2714 [19642] network: Memory leak in getnameinfo
2715 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
2716 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
2718 [19654] math: [x86_64] Need testcase for BZ #19590 fix
2719 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
2721 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
2722 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
2724 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
2726 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
2728 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
2729 pointers and lengths in error-case.
2730 [19727] locale: Converting from/to UTF-xx with iconv() does not always
2731 report errors on UTF-16 surrogates values.
2732 [19755] nscd: nscd assertion failure in gc
2733 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
2734 [19759] libc: mempcpy shouldn't be inlined
2735 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
2736 [19765] libc: s390 needs an optimized mempcpy
2737 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
2738 NAME_MAX limit assumption (CVE-2016-1234)
2739 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
2740 [19787] network: Missing and incorrect truncation checks in getnameinfo
2741 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
2743 [19791] network: Assertion failure in res_query.c with un-connectable name
2745 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
2746 [19822] math: libm.so install clobbers old version
2747 [19825] network: resolv: send_vc can return uninitialized data in second
2748 response to getaddrinfo
2749 [19830] network: nss_dns: should check RDATA length against buffer length
2750 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
2751 confronted with A/AAAA records of invalid size
2752 [19837] nss: nss_db: No retries for some long lines with a larger buffer
2753 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
2754 [19853] stdio: Printing IBM long double in decimal with high precision is
2756 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
2757 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
2758 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
2760 [19865] network: Assertion failure or memory leak in
2761 _nss_dns_getcanonname_r
2762 [19868] network: nss_dns: netent code does not skip over non-PTR records
2763 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
2765 [19881] string: Improve x86-64 memset
2766 [19907] string: Incorrect memcpy tests
2767 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
2769 [19925] libc: termios.h XCASE namespace
2770 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
2771 [19929] libc: limits.h NL_NMAX namespace
2772 [19931] stdio: Memory leak in vfprintf
2773 [19957] libc: clone(CLONE_VM) access invalid parent memory
2774 [19963] localedata: en_IL: New locale
2775 [19989] stdio: stdio.h cuserid namespace
2776 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
2778 [19996] locale: langinfo.h nl_langinfo_l namespace
2779 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
2780 [20010] network: getaddrinfo: Stack overflow in hostent translation
2782 [20012] stdio: libio: fmemopen append mode failure
2783 [20014] stdio: stdio.h namespace for pre-threads POSIX
2784 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
2785 [20023] libc: fcntl.h timespec namespace
2786 [20024] math: [x86_64] vectorized sincos trashes the stack
2787 [20031] network: nss_hesiod: Heap overflow in get_txt_records
2788 [20041] time: sys/time.h timespec namespace
2789 [20043] libc: unistd.h missing cuserid for UNIX98 and before
2790 [20044] libc: unistd.h missing pthread_atfork for UNIX98
2791 [20051] libc: ttyslot in wrong header under wrong conditions
2792 [20054] libc: gethostname not declared for XPG4
2793 [20055] libc: termios.h missing tcgetsid for XPG4
2794 [20072] dynamic-link: x86 init_cpu_features is called twice in static
2796 [20073] libc: sys/stat.h fchmod namespace
2797 [20074] libc: stdlib.h rand_r namespace
2798 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
2799 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
2801 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
2802 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
2804 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
2805 [20119] libc: Wrong mask for processors level type from CPUID
2806 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
2807 AS not supporting AVX512
2808 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
2810 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
2811 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
2813 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
2814 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
2815 [20178] libc: posix_spawn{p} should not call exit
2816 [20191] stdio: libio: vtables hardening
2817 [20195] string: FMA4 detection requires CPUID execution with register
2819 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
2820 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
2822 [20212] math: acos (sNaN) returns sNaN
2823 [20213] math: asin (sNaN) returns sNaN
2824 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
2825 [20218] math: [i386] asinhl (sNaN) returns sNaN
2826 [20219] math: [i386] atanhl (sNaN) returns sNaN
2827 [20222] stdio: fopencookie: Mangle function pointers
2828 [20224] math: [i386] cbrtl (sNaN) returns sNaN
2829 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
2830 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
2832 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
2833 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
2834 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
2835 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
2836 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
2837 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
2838 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
2839 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
2840 [20240] math: modf (sNaN) returns sNaN
2841 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
2842 [20250] math: frexp (sNaN) returns sNaN
2843 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
2844 [20255] math: [i386] fdim, fdimf return with excess range and precision /
2846 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
2847 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
2848 subscript is below array bounds [-Werror=array-bounds]
2849 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
2850 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
2852 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
2853 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
2855 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
2856 "invalid" exceptions
2857 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
2858 [20316] localedata: id_ID: Februari instead of Pebruari
2859 [20327] string: POWER8 strcasecmp returns incorrect result
2860 [20347] math: Failure: Test: j0_downward (0xap+0)
2861 [20348] libc: FAIL: misc/tst-preadvwritev64
2862 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
2863 [20350] libc: There is no test for p{read,write}64
2864 [20357] math: Incorrect cos result for 1.5174239687223976
2865 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
2869 * Unicode 8.0.0 Support: Character encoding, character type info, and
2870 transliteration tables are all updated to Unicode 8.0.0, using new
2871 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
2872 These updates cause user visible changes, such as the fixes for bugs
2873 89, 16061, and 18568.
2875 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
2876 kernel-internal CPU set size. This means that requests that change the
2877 CPU affinity which failed before (for example, an all-ones CPU mask) will
2878 now succeed. Applications that need to determine the effective CPU
2879 affinities need to call sched_getaffinity or pthread_getaffinity_np after
2880 setting it because the kernel can adjust it (and the previous size check
2881 would not detect this in the majority of cases).
2883 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
2884 the following new symbols are used: fts64_children, fts64_close,
2885 fts64_open, fts64_read and fts64_set.
2887 * getaddrinfo now detects certain invalid responses on an internal netlink
2888 socket. If such responses are received, an affected process will
2889 terminate with an error message of "Unexpected error <number> on netlink
2890 descriptor <number>" or "Unexpected netlink response of size <number> on
2891 descriptor <number>". The most likely cause for these errors is a
2892 multi-threaded application which erroneously closes and reuses the netlink
2893 file descriptor while it is used by getaddrinfo.
2895 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
2896 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
2897 unnecessary serialization of memory allocation requests across threads.
2898 The defect is now corrected. Users should see a substantial increase in
2899 the concurent throughput of allocation requests for applications which
2900 trigger this bug. Affected applications typically create and
2901 destroy threads frequently. (Bug 19048 was reported and analyzed by
2904 * There is now a --disable-timezone-tools configure option for disabling the
2905 building and installing of the timezone related utilities (zic, zdump, and
2906 tzselect). This is useful for people who build the timezone data and code
2907 independent of the GNU C Library.
2909 * The obsolete header <regexp.h> has been removed. Programs that require
2910 this header must be updated to use <regex.h> instead.
2912 * The obsolete functions bdflush, create_module, get_kernel_syms,
2913 query_module and uselib are no longer available to newly linked binaries;
2914 the header <sys/kdaemon.h> has been removed. These functions and header
2915 were specific to systems using the Linux kernel and could not usefully be
2916 used with the GNU C Library on systems with version 2.6 or later of the
2919 * Optimized string, wcsmbs and memory functions for IBM z13.
2920 Implemented by Stefan Liebler.
2922 * Newly linked programs that define a variable called signgam will no longer
2923 have it set by the lgamma, lgammaf and lgammal functions. Programs that
2924 require signgam to be set by those functions must ensure that they use the
2925 variable provided by the GNU C Library and declared in <math.h>, without
2926 defining their own copy.
2928 * The minimum GCC version that can be used to build this version of the GNU
2929 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
2930 still be used to compile programs using the GNU C Library.
2932 Security related changes:
2934 * An out-of-bounds value in a broken-out struct tm argument to strftime no
2935 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
2937 * The LD_POINTER_GUARD environment variable can no longer be used to disable
2938 the pointer guard feature. It is always enabled. Previously,
2939 LD_POINTER_GUARD could be used to disable security hardening in binaries
2940 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
2943 * An integer overflow in hcreate and hcreate_r could lead to an
2944 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
2946 * The catopen function no longer has unbounded stack usage. Reported by
2947 Max. (CVE-2015-8779)
2949 * The nan, nanf and nanl functions no longer have unbounded stack usage
2950 depending on the length of the string passed as an argument to the
2951 functions. Reported by Joseph Myers. (CVE-2014-9761)
2953 * A stack-based buffer overflow was found in libresolv when invoked from
2954 libnss_dns, allowing specially crafted DNS responses to seize control
2955 of execution flow in the DNS client. The buffer overflow occurs in
2956 the functions send_dg (send datagram) and send_vc (send TCP) for the
2957 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
2958 family. The use of AF_UNSPEC triggers the low-level resolver code to
2959 send out two parallel queries for A and AAAA. A mismanagement of the
2960 buffers used for those queries could result in the response of a query
2961 writing beyond the alloca allocated buffer created by
2962 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
2963 the overflow. Thanks to the Google Security Team and Red Hat for
2964 reporting the security impact of this issue, and Robert Holiday of
2965 Ciena for reporting the related bug 18665. (CVE-2015-7547)
2967 The following bugs are resolved with this release:
2969 [89] localedata: Locales nb_NO and nn_NO should transliterate ÊÞÄ
2970 [887] math: Math library function "logb" and "nextafter" inconsistent
2971 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
2972 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
2973 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
2974 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
2976 [4404] localedata: German translation of "Alarm clock" is misleading
2977 [6799] math: nextafter() and nexttoward() doen't set errno on
2978 overflow/underflow errors
2979 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
2981 [10432] nis: _nss_nis_setnetgrent assertion failure
2982 [11460] libc: fts has no LFS support
2983 [12926] network: getaddrinfo()/make_request() may spin forever
2984 [13065] nptl: Race condition in pthread barriers
2985 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
2986 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
2988 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
2989 [14912] libc: Rename non-installed bits/*.h headers
2990 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
2991 [15367] math: Let gcc use __builtin_isinf
2992 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
2993 [15421] math: lgamma wrongly sets signgam for ISO C
2994 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
2995 FE_INVALID with argument out of range
2996 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
2998 [15786] dynamic-link: ifunc resolver functions can smash function
3000 [15918] math: Unnecessary check for equality in hypotf()
3001 [16061] localedata: Review / update transliteration data
3002 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3004 [16141] time: strptime %z offset restriction
3005 [16171] math: drem should be alias of remainder
3006 [16296] math: fegetround is pure?
3007 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3008 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3010 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3011 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3013 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3014 "Exception "Inexact" set" on ppc32
3015 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3016 [16517] math: Missing underflow exception from tanf/tan/tanl
3017 [16519] math: Missing underflow exception from sinhf
3018 [16520] math: Missing underflow exception from tanhf
3019 [16521] math: Missing underflow exception from exp2
3020 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3022 [16734] stdio: fopen calls mmap to allocate its buffer
3023 [16961] math: nan function incorrect handling of bad sequences
3024 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3025 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3026 [16985] locale: localedef: confusing error message when opening output
3028 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3029 [17197] locale: Redundant shift character in iconv conversion output at
3031 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3032 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3033 [17250] dynamic-link: static linking breaks nss loading
3034 (getaddrinfo/getpwnam/etc...)
3035 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3037 [17441] math: isnan() should use __builtin_isnan() in GCC
3038 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3039 (related to lock elision)
3040 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3041 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3042 [17887] time: strptime should be able to parse "+01:00" style timezones
3043 [17905] libc: catopen() Multiple unbounded stack allocations
3045 [18084] libc: backtrace (..., 0) dumps core on x86
3046 [18086] libc: nice() sets errno to 0 on success
3047 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3048 is too large (CVE-2015-8778)
3049 [18251] dynamic-link: SONAME missing when audit modules provides path
3050 [18265] libc: add attributes for wchar string and memory functions
3051 [18370] math: csqrt missing underflows
3052 [18421] libc: [hppa] read-only segment has dynamic relocations
3053 [18472] libc: Obsolete syscall wrappers should be compat symbols
3054 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3055 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3056 [18525] localedata: Remove locale timezone information
3057 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3058 [18568] localedata: Update locale data to Unicode 8.0
3059 [18589] locale: sort-test.sh fails at random
3060 [18595] math: ctan, ctanh missing underflows
3061 [18604] libc: assert macro-expands its argument
3062 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3063 contains a vector instruction exception.
3064 [18611] math: j1, jn missing errno setting on underflow
3065 [18618] localedata: sync Chechen locale definitions with other *_RU
3067 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3068 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3069 [18665] network: In send_dg, the recvfrom function is NOT always using the
3070 buffer size of a newly created buffer (CVE-2015-7547)
3071 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3073 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3075 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3076 [18699] math: tilegx cproj() for various complex infinities does not yield
3078 [18724] libc: Harden put*ent functions against data injection
3079 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3080 [18755] build: build errors with -DNDEBUG
3081 [18757] stdio: fmemopen fails to set errno on failure
3082 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3084 [18781] libc: openat64 lacks O_LARGEFILE
3085 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3086 error: canât find a register in class âR1_REGSâ while reloading âasmâ
3087 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3088 [18790] math: [ldbl-128ibm] tanhl inaccurate
3089 [18795] libc: stpncpy fortification misses buffer lengths that are
3090 statically too large
3091 [18796] build: build fails for --disable-mathvec
3092 [18803] math: hypot missing underflows
3093 [18820] stdio: fmemopen may leak memory on failure
3094 [18823] math: csqrt spurious underflows
3095 [18824] math: fma spurious underflows
3096 [18825] math: pow missing underflows
3097 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3098 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3099 [18870] build: sem_open.c fails to compile with missing symbol
3101 [18872] stdio: Fix memory leak in printf_positional
3102 [18873] libc: posix_fallocate overflow check ineffective
3103 [18875] math: Excess precision leads incorrect libm
3104 [18877] libc: arm: mmap offset regression
3105 [18887] libc: memory corruption when using getmntent on blank lines
3106 [18918] localedata: hu_HU: change time to HH:MM:SS format
3107 [18921] libc: Regression: extraneous stat() and fstat() performed by
3109 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3110 binaries (CVE-2015-8777)
3111 [18951] math: tgamma missing underflows
3112 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3114 [18953] localedata: lt_LT: change currency symbol to the euro
3115 [18956] math: powf inaccuracy
3116 [18961] math: [i386] exp missing underflows
3117 [18966] math: [i386] exp10 missing underflows
3118 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3119 [18969] build: multiple string test failures due to missing locale
3121 [18970] libc: Reference of pthread_setcancelstate in libc.a
3122 [18977] math: float / long double Bessel functions not in XSI POSIX
3123 [18980] math: i386 libm functions return with excess range and precision
3124 [18981] math: i386 scalb*, ldexp return with excess range and precision
3125 [18982] stdio: va_list and vprintf
3126 [18985] time: Passing out of range data to strftime() causes a segfault
3128 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3129 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3130 [19012] locale: iconv_open leaks memory on error path
3131 [19016] math: clog, clog10 inaccuracy
3132 [19018] nptl: Mangle function pointers in tls_dtor_list
3133 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3134 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3135 [19048] malloc: malloc: arena free list can become cyclic, increasing
3137 [19049] math: [powerpc] erfc incorrect zero sign
3138 [19050] math: [powerpc] log* incorrect zero sign
3139 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3140 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3141 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3142 [19074] network: Data race in _res_hconf_reorder_addrs
3143 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3144 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3145 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3147 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3149 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3150 [19086] manual: posix_fallocate64 documented argument order is wrong.
3151 [19088] math: lround, llround missing exceptions close to overflow
3153 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3154 [19095] math: dbl-64 lrint incorrect for 64-bit long
3155 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3156 [19124] dynamic-link: ld.so failed to build with older assmebler
3157 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3158 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3159 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3160 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3161 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3162 pthread_setaffinity_np
3163 [19156] math: [ldbl-128] j0l spurious underflows
3164 [19164] nptl: tst-getcpu fails with many possible CPUs
3165 [19168] math: math/test-ildoubl and math/test-ldouble failure
3166 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3167 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3169 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3170 (FE_NOMASK_ENV) do not clear SSE exceptions
3171 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3172 _int_new_arena/reused_arena
3173 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3174 [19201] math: dbl-64 remainder incorrect sign of zero result
3175 [19205] math: bits/math-finite.h conditions do not match math.h and
3177 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3178 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3179 for C99-based standards
3180 [19212] libc: features.h not -Wundef clean
3181 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3183 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3184 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3185 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3187 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3188 "inexact" exceptions
3189 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3191 [19242] libc: strtol incorrect in Turkish locales
3192 [19243] malloc: reused_arena can pick an arena on the free list, leading
3193 to an assertion failure and reference count corruption
3194 [19253] time: tzset() ineffective when temporary TZ did not include DST
3196 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3197 [19270] math: [hppa] Shared libm missing __isnanl
3198 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3199 MAP_HUGETLB and MAP_STACK defines
3200 [19313] nptl: Wrong __cpu_mask for x32
3201 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3202 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3203 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3204 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3205 [19363] time: x32: times() return value wrongly truncates/sign extends
3207 [19367] dynamic-link: Improve branch prediction on Silvermont
3208 [19369] network: Default domain name not reset by res_ninit when "search"
3209 / "domain" entry is removed from resolv.conf
3210 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3212 [19385] localedata: bg_BG: time separator should be colon, not comma
3213 [19408] libc: linux personality syscall wrapper may erroneously return an
3214 error on 32-bit architectures
3215 [19415] libc: dladdr returns wrong names on hppa
3216 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3217 IBM905, IBM907, and IBM909
3218 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3219 [19443] build: build failures with -DDEBUG
3220 [19451] build: Make check fails on test-double-vlen2
3221 [19462] libc: Glibc failed to build with -Os
3222 [19465] math: Wrong code with -Os
3223 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3225 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3227 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3228 [19486] math: S390: Math tests fail with "Exception Inexact set".
3229 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3230 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3232 [19590] math: Fail to build shared objects that use libmvec.so functions.
3236 * The following bugs are resolved with this release:
3238 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3239 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3240 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3241 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3242 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3243 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3244 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3245 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3246 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3247 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3248 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3249 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3250 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3251 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3252 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3253 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3254 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3255 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3256 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3257 18657, 18676, 18694, 18696, 18887.
3259 * Cache information can be queried via sysconf() function on s390 e.g. with
3260 _SC_LEVEL1_ICACHE_SIZE as argument.
3262 * A buffer overflow in gethostbyname_r and related functions performing DNS
3263 requests has been fixed. If the NSS functions were called with a
3264 misaligned buffer, the buffer length change due to pointer alignment was
3265 not taken into account. This could result in application crashes or,
3266 potentially arbitrary code execution, using crafted, but syntactically
3267 valid DNS responses. (CVE-2015-1781)
3269 * The time zone file parser has been made more robust against crafted time
3270 zone files, avoiding heap buffer overflows related to the processing of
3271 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3272 large time zone data files. Overly long time zone specifiers in the TZ
3273 variable no longer result in stack overflows and crashes.
3275 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3276 for LD and GD on x86 and x86-64, has been implemented. You will need
3277 binutils-2.24 or later to enable this optimization.
3279 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3280 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3281 Hat). These updates cause user visible changes, such as the fix for bug
3284 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3285 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3286 condition in some applications.
3288 * Added vector math library named libmvec with the following vectorized x86_64
3289 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3291 The library can be disabled with --disable-mathvec. Use of the functions is
3292 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3293 Shared library libmvec.so is linked in as needed when using -lm (no need to
3294 specify -lmvec explicitly for not static builds).
3295 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3297 * A new fmemopen implementation has been added with the goal of POSIX
3298 compliance. The new implementation fixes the following long-standing
3299 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3300 old implementation is still present for use be by existing binaries.
3302 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3303 releases. It has been fixed to match 2.19 and older, but binaries built
3304 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3306 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3307 Contributed by Roland McGrath (Google).
3309 * The header <regexp.h> is deprecated, and will be removed in a future
3310 release. Use of this header will trigger a deprecation warning.
3311 Application developers should update their code to use <regex.h> instead.
3313 This header was formerly part of SUS, but was deprecated in 1994 and
3314 removed from the standard in 2001. Also, the glibc implementation
3315 leaks memory. See BZ#18681 for more details.
3319 * The following bugs are resolved with this release:
3321 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3322 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3323 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3324 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3325 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3326 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3327 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3328 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3329 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3330 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3333 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3334 too little memory for the to-be-scanned arguments and overflow the
3335 allocated buffer. The implementation now correctly computes the required
3336 buffer size when using malloc, and switches to malloc from alloca as
3339 * A new semaphore algorithm has been implemented in generic C code for all
3340 machines. Previous custom assembly implementations of semaphore were
3341 difficult to reason about or ensure that they were safe. The new version
3342 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3343 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3344 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3346 * Port to Altera Nios II has been contributed by Mentor Graphics.
3348 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3349 implementations for powerpc64/powerpc64le.
3350 Implemented by Adhemerval Zanella (IBM).
3352 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3353 and powerpc64le. This may improve lock scaling of existing programs on
3354 HTM capable systems. The lock elision code is only enabled with
3355 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3356 powerpc will issue a transaction abort on every syscall to avoid side
3357 effects being visible outside transactions.
3359 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3360 AArch64. Contributed by ARM Ltd.
3362 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3364 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3365 under certain input conditions resulting in the execution of a shell for
3366 command substitution when the application did not request it. The
3367 implementation now checks WRDE_NOCMD immediately before executing the
3368 shell and returns the error WRDE_CMDSUB as expected.
3370 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3371 processing format strings with a large number of format specifiers.
3373 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3374 infinite loop if the DNS response contained a PTR record of an unexpected
3377 * The minimum GCC version that can be used to build this version of the GNU
3378 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3379 still be used to compile programs using the GNU C Library.
3381 * The GNU C Library is now built with -Werror by default. This can be
3382 disabled by configuring with --disable-werror.
3384 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3386 * The obsolete sigvec function has been removed. This was the original
3387 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3388 programs have been using instead for about 25 years. Of course, ABI
3389 compatibility for old binaries using sigvec remains intact.
3391 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3392 with newer versions of bison.
3394 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3395 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3396 registers overlay two consecutive single-precision registers. MIPS32R2
3397 introduced a new FPU mode (FR=1) where double-precision registers extend the
3398 corresponding single-precision registers which is incompatible with the
3399 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3400 require the use of FR=1 making a transition necessary. New o32 ABI
3401 extensions enable users to migrate over time from the original o32 ABI
3402 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3403 tracks the ABI of any loaded object and verifies that new objects are
3404 compatible. Mode transitions will also be requested as required and
3405 unsupportable objects will be rejected. The ABI checks include both soft and
3406 hard float ABIs for o32, n32 and n64.
3408 GCC 5 with GNU binutils 2.25 onwards:
3409 It is strongly recommended that all o32 system libraries are built using the
3410 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3411 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3412 compiler using --with-fp-32=xx to set this by default.
3416 * The following bugs are resolved with this release:
3418 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3419 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3420 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3421 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3422 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3423 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3424 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3425 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3426 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3427 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3428 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3429 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3430 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3431 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3432 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3434 * Reverted change of ABI data structures for s390 and s390x:
3435 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3436 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3437 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3438 are preserved pointing straight to the same implementation as the old ones.
3439 Given that, new callers will simply provide a too-big buffer to these
3440 functions. Any applications/libraries out there that embed jmp_buf or
3441 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3442 against 2.19 headers will have to rebuilt again. This is necessary in any
3443 case to revert the breakage in their ABI caused by the glibc change.
3445 * Support for file description locks is added to systems running the
3446 Linux kernel. The standard file locking interfaces are extended to
3447 operate on file descriptions, not file descriptors, via the use of
3448 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3449 are associated with an open file instead of a process.
3451 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3453 * The minimum Linux kernel version that this version of the GNU C Library
3454 can be used with is 2.6.32.
3456 * Running the testsuite no longer terminates as soon as a test fails.
3457 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3458 with PASS or FAIL lines for individual tests. A summary of the results is
3459 printed, including a list of failing lists, and "make check" exits with
3460 error status if there were any unexpected failures. "make check
3461 stop-on-test-failure=y" may be used to keep the old behavior.
3463 * The am33 port, which had not worked for several years, has been removed
3466 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3467 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3468 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3469 conflicted with POSIX (support for which was removed in 2.19), the
3470 interfaces those macros enabled remain available when compiling with
3471 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3472 test macros defined.
3474 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3476 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3477 This may improve lock scaling of existing programs on TX capable systems.
3478 The lock elision code is only built with --enable-lock-elision=yes and
3479 then requires a GCC version supporting the TX builtins. With lock elision
3480 default mutexes are elided via __builtin_tbegin, if the cpu supports
3481 transactions. By default lock elision is not enabled and the elision code
3484 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3485 copy the path argument. This allowed programs to cause posix_spawn to
3486 deference a dangling pointer, or use an unexpected pathname argument if
3487 the string was modified after the posix_spawn_file_actions_addopen
3490 * All supported architectures now use the main glibc sysdeps directory
3491 instead of some being in a separate "ports" directory (which was
3492 distributed separately before glibc 2.17).
3494 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3495 On configurations that support it (all Linux configurations), it's now
3496 used regardless of the --enable-add-ons switch to configure. It is no
3497 longer possible to build such configurations without pthreads support.
3499 * Locale names, including those obtained from environment variables (LANG
3500 and the LC_* variables), are more tightly checked for proper syntax.
3501 setlocale will now fail (with EINVAL) for locale names that are overly
3502 long, contain slashes without starting with a slash, or contain ".." path
3503 components. (CVE-2014-0475) Previously, some valid locale names were
3504 silently replaced with the "C" locale when running in AT_SECURE mode
3505 (e.g., in a SUID program). This is no longer necessary because of the
3508 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3509 with application code using Intel MPX instructions. (With all previous
3510 versions, the MPX register state could be clobbered when making calls
3511 into or out of a shared library.) Note that while the new dynamic
3512 linker is compatible with all known x86 hardware whether or not it
3513 supports Intel MPX, some x86 instruction-set emulators might fail to
3514 handle the new instruction encodings. This is known to affect Valgrind
3515 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3516 release), and might affect other tools that do instruction emulation.
3518 * Support for loadable gconv transliteration modules has been removed.
3519 The support for transliteration modules has been non-functional for
3520 over a decade, and the removal is prompted by security defects. The
3521 normal gconv conversion modules are still supported. Transliteration
3522 with //TRANSLIT is still possible, and the //IGNORE specifier
3523 continues to be supported. (CVE-2014-5119)
3525 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3526 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3527 resulting a denial-of-service security vulnerability in applications which
3528 use functions related to iconv. (CVE-2014-6040)
3532 * The following bugs are resolved with this release:
3534 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3535 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3536 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3537 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3538 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3539 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3540 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3541 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3542 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3543 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3544 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3545 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3546 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3547 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3548 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3549 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3550 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3551 16431, 16453, 16474, 16506, 16510, 16529
3553 * Slovenian translations for glibc messages have been contributed by the
3554 Translation Project's Slovenian team of translators.
3556 * The public headers no longer use __unused nor __block. This change is to
3557 support compiling programs that are derived from BSD sources and use
3558 __unused internally, and to support compiling with Clang's -fblock
3559 extension which uses __block.
3561 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3562 large collation sequences to optimize multiple passes. This cache
3563 computation may overflow for large collation sequences and may cause a
3564 stack or buffer overflow. This is now fixed to use a slower algorithm
3565 which does not use a cache if there is an integer overflow.
3567 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3568 rules for large collation sequences to optimize multiple passes and falls
3569 back to alloca if malloc fails, resulting in a possible stack overflow.
3570 The implementation now falls back to an uncached collation sequence lookup
3573 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3574 initialized for static applications resulting in the security feature
3575 being disabled. The pointer guard is now correctly initialized to a
3576 random value for static applications. Existing static applications need
3577 to be recompiled to take advantage of the fix (bug 15754).
3579 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3580 to the d_name member of struct dirent, or omit the terminating NUL
3581 character. (Bugzilla #14699).
3583 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3584 aligned_alloc functions could allocate too few bytes or corrupt the
3585 heap when passed very large allocation size values (Bugzilla #15855,
3588 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3589 for AF_INET6 has been fixed (Bugzilla #16072).
3591 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3592 pap_CW, quz_PE, the_NP.
3594 * Substantially revised locales: gd_GB, ht_HT
3596 * The LC_ADDRESS field was updated to support country_car for almost all
3599 * ISO 1427 definitions were updated.
3601 * ISO 3166 definitions were updated.
3603 * The localedef utility now supports --big-endian and --little-endian
3604 command-line options to generate locales for a different system from that
3605 for which the C library was built.
3607 * Binary locale files now only depend on the endianness of the system for
3608 which they are generated and not on other properties of that system. As a
3609 consequence, binary files generated with new localedef may be incompatible
3610 with old versions of the GNU C Library, and binary files generated with
3611 old localedef may be incompatible with this version of the GNU C Library,
3612 in the following circumstances:
3614 + Locale files may be incompatible on m68k systems.
3616 + Locale archive files (but not separate files for individual locales) may
3617 be incompatible on systems where plain "char" is signed.
3619 * The configure option --disable-versioning has been removed. Builds with
3620 --disable-versioning had not worked for several years.
3622 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3623 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3625 * SystemTap probes for malloc have been introduced.
3627 * SystemTap probes for slow multiple precision fallback paths of
3628 transcendental functions have been introduced.
3630 * Support for powerpc64le has been added.
3632 * The soft-float powerpc port now supports e500 processors.
3634 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3636 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3637 set of header declarations that are enabled by default, even when other
3638 feature test macros or compiler options such as -std=c99 would otherwise
3639 disable some of those declarations.
3641 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3642 conflict with POSIX. The libbsd-compat library (which was a dummy library
3643 that did nothing) has also been removed.
3645 * Preliminary documentation about Multi-Thread, Async-Signal and
3646 Async-Cancel Safety has been added.
3648 * Change of ABI data structures for s390 and s390x:
3649 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3650 allow for future hardware extensions. All library functions that accept or
3651 return these structures were versioned in order to provide backwards
3652 compatibility with existing code. However, not all cases can be handled
3653 with interface versioning. If an application embeds either structure into
3654 another structure and that structure is passed to another compilation unit
3655 which expects the newer larger-sized object then any access to the new
3656 fields will result in undefined behaviour. Similarly any access to fields
3657 that were moved by the enlarging of the structures will cause undefined
3658 behaviour. To fix the undefined behaviour all objects that are part of the
3659 final in-memory image must agree on the size of structures, and this may
3660 require recompilation.
3664 * The following bugs are resolved with this release:
3666 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3667 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3668 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3669 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3670 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3671 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3672 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3673 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3674 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3675 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3676 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3677 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3678 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3681 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3682 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3683 Distributions can re-enable building and using pt_chown via the new configure
3684 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
3685 considerable security risks and should only be used if the distribution
3686 understands and accepts the risks.
3688 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3691 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3692 fixed (Bugzilla #15330).
3694 * Add support for calling C++11 thread_local object destructors on thread
3695 and program exit. This needs compiler support for offloading C++11
3696 destructor calls to glibc.
3698 * Improved worst case performance of libm functions with double inputs and
3701 * Support for priority inherited mutexes in pthread condition variables on
3702 non-x86 architectures.
3704 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
3706 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
3708 * Optimized string functions for ARM. Implemented by Will Newton and
3711 * Optimized libm functions for SPARC. Implemented by David S. Miller.
3713 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
3716 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
3717 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
3719 * Added a benchmark framework to track performance of functions in glibc.
3721 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
3722 It is based on draft TS 18661 and currently enabled as a GNU extension.
3724 * On Linux, the clock function now uses the clock_gettime system call
3725 for improved precision, rather than old times system call.
3727 * Added support for version-3 tz format files. This is needed when using
3728 the tz database release 2013e or later, and affects a few unusual cases --
3729 currently only TZ='America/Godthab' for time stamps after 2037.
3731 * Added new API functions pthread_getattr_default_np and
3732 pthread_setattr_default_np to get and set the default pthread
3733 attributes of a process.
3735 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
3736 This may improve lock scaling of existing programs on TSX capable systems.
3737 When the --enable-lock-elision=yes parameter is specified at configure
3738 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
3741 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
3742 availability). Implemented by Ryan S. Arnold.
3744 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
3748 * The following bugs are resolved with this release:
3750 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
3751 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
3752 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
3753 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
3754 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
3755 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
3756 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
3757 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
3758 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
3759 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
3760 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
3761 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
3762 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
3763 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
3764 14879, 14889, 14893, 14898, 14914.
3766 * Optimization of memcpy for MIPS.
3768 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
3769 EMFILE has been fixed (Bugzilla #14889).
3771 * The add-on ports collection is now distributed in the "ports" subdirectory
3772 of the main GNU C Library distribution, rather than separately.
3774 * Port to ARM AArch64 contributed by Linaro.
3776 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
3777 Optimized versions of memcpy, memset, and memcmp added for System z10 and
3779 Implemented by Andreas Krebbel.
3781 * The new function secure_getenv allows secure access to the environment,
3782 returning NULL if running in a SUID/SGID process. This function replaces
3783 the internal function __secure_getenv.
3785 * SystemTap static probes have been added into the dynamic linker.
3786 Implemented by Gary Benson.
3788 * Optimizations of string functions strstr, strcasestr and memmem.
3789 Implemented by Maxim Kuvyrkov.
3791 * The minimum Linux kernel version that this version of the GNU C Library
3792 can be used with is 2.6.16.
3794 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
3795 powerpc POWER7. Implemented by Will Schmidt.
3797 * New configure option --disable-nscd builds the C library such that it
3798 never attempts to contact the Name Service Caching Daemon (nscd).
3799 New configure option --disable-build-nscd avoids building nscd itself;
3800 this is the default if --disable-nscd is used.
3802 * Improved support for cross-compilation, including cross-testing and
3803 bootstrap builds without a previously built glibc.
3805 * Several testsuite tests are now able to test multiple IFUNC variants of an
3806 interface, rather than just testing the one that would be chooen by
3809 * New configure options --with-bugurl and --with-pkgversion, for
3810 distributors to use to embed their bug-reporting and package version
3811 information in --help and --version output.
3813 * The ttyname and ttyname_r functions on Linux now fall back to searching for
3814 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
3815 allows creation of chroots without the procfs mounted on /proc.
3817 * The `crypt' function now fails if passed salt bytes that violate the
3818 specification for those values. On Linux, the `crypt' function will
3819 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
3820 enabled, and fail on encrypted strings using the MD5 or DES algorithm
3821 when the mode is enabled.
3823 * The `clock_*' suite of functions (declared in <time.h>) is now available
3824 directly in the main C library. Previously it was necessary to link with
3825 -lrt to use these functions. This change has the effect that a
3826 single-threaded program that uses a function such as `clock_gettime' (and
3827 is not linked with -lrt) will no longer implicitly load the pthreads
3828 library at runtime and so will not suffer the overheads associated with
3829 multi-thread support in other code such as the C++ runtime library.
3831 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
3836 * The following bugs are resolved with this release:
3838 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
3839 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
3840 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
3841 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
3842 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
3843 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
3844 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
3845 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
3846 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
3847 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
3848 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
3849 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
3850 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
3851 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
3852 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
3853 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
3854 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
3855 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
3856 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
3857 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
3858 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
3859 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
3862 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
3863 configuring glibc with:
3864 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
3865 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
3866 Implemented by H.J. Lu.
3870 + define static_assert
3872 + do not declare gets
3874 + declare at_quick_exit and quick_exit also for ISO C11
3876 + aligned_alloc. NB: The code is deliberately allows the size parameter
3877 to not be a multiple of the alignment. This is a moronic requirement
3878 in the standard but it is only a requirement on the caller, not the
3881 + timespec_get added
3883 + uchar.h support added
3885 + CMPLX, CMPLXF, CMPLXL added
3887 Implemented by Ulrich Drepper.
3889 * Support for the IA-64 has been moved to ports.
3891 * Remove support for anything but ELF binary format
3893 * Checking versions of poll, ppoll added.
3894 Implemented by Ulrich Drepper.
3896 * More generic and 64-bit performance optimizations to math functions.
3897 Implemented by Ulrich Drepper.
3899 * New configure option --enable-obsolete-rpc makes the deprecated RPC
3900 headers and functions available at compile time as they were before
3901 version 2.14. This option will be removed at some time in the future
3902 after the TI-RPC library becomes fully sufficient for the needs of
3903 existing applications.
3905 * Compatibility code for Linux kernel versions before 2.4 has been removed.
3906 Note that glibc is not expected to work with any Linux kernel version
3909 * New header <sys/auxv.h> and function getauxval allowing easy access to
3910 the AT_* key-value pairs passed from the Linux kernel. The header also
3911 defines the HWCAP_* bits associated with the AT_HWCAP key.
3913 * New locales: mag_IN
3915 * New configure option --enable-systemtap builds SystemTap static probes
3916 into libc for setjmp and longjmp and into libpthread for various operations.
3917 So far the setjmp/longjmp probes and some of the libpthread probes are
3918 provided only for i*86 and x86_64.
3919 Implemented by Roland McGrath and Rayson Ho.
3921 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
3923 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
3926 * More optimized functions for SPARC. Implemented by David S. Miller.
3928 * Improved support for cross-compilation, especially bootstrap builds
3929 without a previously built glibc.
3931 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
3932 Chris Metcalf from Tilera.
3934 * Support for the old ARM ABI has been removed from ports. Only the EABI is
3935 now supported for ARM processors.
3937 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
3938 as the name of the dynamic linker, to distinguish it from the
3939 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
3941 * Support for CRIS has been removed from ports.
3943 * A new class of installed header has been documented for low-level
3944 platform-specific functionality. PowerPC added the first instance with a
3945 function to provide time base register access. Contributed by Tulio
3946 Magno Quites Machado Filho.
3948 * ix86 configurations now install header files that are consistent with
3949 what x86-64 configurations install. These same header files can be used
3950 for -m32, -m64, or -mx32 builds.
3951 Contributed by H.J. Lu.
3953 * Math library bug fixes. A thorough audit of all open math library bugs was
3954 conducted by Joseph Myers. Significant progress was made on many math
3955 library bugs resulting in more accurate exceptions and function results.
3956 Many thanks to all those that contributed including Andreas Jaeger for his
3957 patch review and work on the x87 trigonometric instruction issues.
3959 * Timezone data is no longer installed. Timezone-related binaries and scripts
3960 will continue to be installed. Users should obtain their timezone data from
3961 their distribution provider or from the tzdata package at
3962 <ftp://munnari.oz.au/pub/>.
3966 * The following bugs are resolved with this release:
3968 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
3969 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
3970 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
3971 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
3972 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
3973 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
3974 13484, 13506, 13515, 13523, 13524, 13538, 13540
3976 * New program pldd to list loaded object of a process
3977 Implemented by Ulrich Drepper.
3979 * Add nss_db support back to glibc. No more dependency on Berkeley db
3980 and support for initgroups lookups.
3981 Implemented by Ulrich Drepper.
3983 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
3984 Contributed by HJ Lu.
3986 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
3987 Contributed by HJ Lu.
3989 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
3990 on x86-32 and x86-64.
3991 Contributed by Liubov Dmitrieva.
3993 * Optimized strchr and strrchr for SSE on x86-32.
3994 Contributed by Liubov Dmitrieva.
3996 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
3997 for x86-64 and x86-32.
3998 Contributed by Liubov Dmitrieva.
4000 * New interfaces: scandirat, scandirat64
4001 Implemented by Ulrich Drepper.
4003 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4004 Implemented by Ulrich Drepper.
4006 * nscd now also caches the netgroup database.
4007 Implemented by Ulrich Drepper.
4009 * Integrate libm with gcc's -ffinite-math-only option.
4010 Implemented by Ulrich Drepper.
4012 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4013 to math functions. Implemented by Ulrich Drepper.
4015 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4016 Implemented by Ulrich Drepper.
4018 * New Linux interfaces: process_vm_readv, process_vm_writev
4020 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4021 Implemented by Ulrich Drepper.
4023 * Optimized nearbyint and strcasecmp for PPC.
4024 Implemented by Adhemerval Zanella.
4026 * New locales: bho_IN, unm_US, es_CU, ta_LK
4030 * The following bugs are resolved with this release:
4032 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4033 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4034 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4035 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4036 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4037 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4038 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4039 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4040 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4041 12795, 12811, 12813, 12814, 12841
4043 * The RPC implementation in libc is obsoleted. Old programs keep working
4044 but new programs cannot be linked with the routines in libc anymore.
4045 Programs in need of RPC functionality must be linked against TI-RPC.
4046 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4048 Visible changes of this change include (obviously) the inability to link
4049 programs using RPC functions without referencing the TI-RPC library and the
4050 removal of the RPC headers from the glibc headers.
4051 Implemented by Ulrich Drepper.
4053 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4054 syncfs, setns, sendmmsg
4056 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4057 yue_HK, lij_IT, mhr_RU
4059 * New encodings: CP770, CP771, CP772, CP773, CP774
4061 * New program sotruss to trace calls through PLTs
4062 Implemented by Ulrich Drepper.
4064 * The malloc hook implementation is marked deprecated and will be removed
4065 from the default implementation in the next version. The design never
4066 worked ever since the introduction of threads. Even programs which do
4067 not create threads themselves can use multiple threads created internally.
4071 * The following bugs are resolved with this release:
4073 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4074 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4075 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4076 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4079 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4081 * POWER7 optimizations: memset, memcmp, strncmp
4083 * New optimized string functions for x86-64: strnlen (SSE2),
4084 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4085 Implemented by Ulrich Drepper.
4089 * The following bugs are resolved with this release:
4091 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4092 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4093 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4094 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4095 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4096 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4097 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4098 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4100 * New interfaces: pthread_getname_np, pthread_setname_np
4102 * New Linux interface: recvmmsg
4104 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4106 * The dynamic linker now recognizes supported ABI versions from the
4107 EI_ABIVERSION field in the ELF header.
4108 Implemented by Ulrich Drepper.
4110 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4111 will not be used to fill in password fields in the passwd.byname replies.
4112 Instead it is used to synthesize the shadow.byname table, should it be
4113 missing. This is a useful mode in some installations involving Solaris.
4114 Implemented by Ulrich Drepper.
4116 * New locales: kok_IN, sq_MK, cv_RU
4120 * The following bugs are resolved with this release:
4122 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4123 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4124 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4125 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4126 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4127 10789, 10817, 10823, 10840, 10847
4129 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4131 Implemented by Ulrich Drepper.
4133 * Checking version of longjmp added that fails if an uninitialized stack
4134 frame would be created. Implemented by Ulrich Drepper.
4136 * STT_GNU_IFUNC is now supported in static executables.
4137 Implemented by H.J. Lu.
4139 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4141 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4142 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4143 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4144 Contributed by H.J. Lu.
4146 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4147 Implemented by Ulrich Drepper.
4149 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4151 Contributed by H.J. Lu.
4153 * Support for fma instruction in AVX on x86-64.
4154 Implemented by H.J. Lu and Ulrich Drepper.
4156 * AVX support in x86-64 auditing support in ld.so.
4157 Implemented by H.J. Lu.
4159 * STB_GNU_UNIQUE support added.
4160 Implemented by Ulrich Drepper.
4162 * Implement second fallback mode for optimized DNS lookup for even more
4163 broken environments. If two requests from the same port are not
4164 handled correctly close the socket and open a new one before sending
4165 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4166 can be used to select this mode right away, instead of rediscovering the
4167 necessity is every process again.
4168 Implemented by Ulrich Drepper.
4170 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4171 Implemented by Adam Tkac.
4173 * Optimized iconv conversions for S390x.
4174 Implemented by Andreas Krebbel.
4176 * Using condvars with PI mutexes is now more efficient due to kernel
4177 support for requeueing to PI futexes. NPTL support added for x86-64.
4178 Implemented by Ulrich Drepper.
4180 * New locales: ps_AF, my_MM
4184 * The following bugs are resolved with this release:
4186 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4187 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4188 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4189 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4190 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4192 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4193 Implemented by Ulrich Drepper.
4195 * New Linux interfaces: accept4, fallocate, fallocate64.
4196 Implemented by Ulrich Drepper.
4198 * Correct declarations of string function when used in C++ code. This
4199 could lead to compile errors for invalid C++ code.
4201 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4204 * New POSIX 2008 interface: psiginfo
4205 Implemented by Ulrich Drepper.
4207 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4208 Implemented by Ulrich Drepper.
4210 * Support for selecting between multiple function definitions at runtime
4211 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4213 * The libcrypt library can now use the hash function implementations in
4214 NSS. Implemented by Ulrich Drepper.
4216 * The malloc implementation can be compiled to be less memory efficient
4217 but higher performing in multi-threaded programs.
4218 Implemented by Ulrich Drepper.
4220 * New locales: nan_TW@latin, ks_IN
4222 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4223 Implemented by Ulrich Drepper.
4225 * Extended printf hook support. It is possible to use user-defined types
4226 and extend existing format specifiers.
4227 Implemented by Ulrich Drepper.
4229 * Handling for group shadow files has been added.
4230 Implemented by Ulrich Drepper.
4232 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4233 servers (the case, e.g., for some people using the built-in DNS
4234 server in ADSL modems/routers). There is a once-per-process timeout
4235 in case of a broken server. To avoid it, users can run nscd or put
4236 'options single-request' in /etc/resolv.conf.
4237 Implemented by Ulrich Drepper.
4241 * The following bugs are resolved with this release:
4243 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
4244 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
4245 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
4246 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
4247 6968, 6974, 6980, 6995, 7008, 7009, 7029
4249 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4250 up at the same time. Implemented by Ulrich Drepper.
4252 * TLS descriptors for LD and GD on x86 and x86-64.
4253 Implemented by Alexandre Oliva.
4255 * getaddrinfo now handles DCCP and UDPlite.
4256 Implemented by Ulrich Drepper.
4258 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4259 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4260 Implemented by Ulrich Drepper.
4262 * New implementation of memmem, strstr, and strcasestr which is O(n).
4263 Implemented by Eric Blake.
4265 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4267 * Implement "e" option for popen to open file descriptor with the
4268 close-on-exec flag set. Implemented by Ulrich Drepper.
4270 * Implement "b" mode for fmemopen. In this mode writes writes don't
4271 implicitly add a NUL byte and seeks from the end of the buffer really
4272 use the buffer end, not the string length as the basis.
4273 Implemented by Ulrich Drepper.
4275 * Many functions, exported and internal, now atomically set the close-on-exec
4276 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4278 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4280 Implemented by Pravin Satpute.
4282 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4286 * The following bugs are resolved with this release:
4288 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4289 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4290 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4291 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4292 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4293 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4294 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4296 * New locales: bo_CN, bo_IN, shs_CA.
4298 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4300 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4301 Implemented by Pravin Satpute.
4303 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4305 * nscd caches now all timeouts for DNS entries
4306 Implemented by Ulrich Drepper.
4308 * nscd is more efficient and wakes up less often.
4309 Implemented by Ulrich Drepper.
4311 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4312 vdprintf, and obstack_vprintf.
4313 Implemented by Jakub Jelinek.
4315 * Faster memset for x86-64.
4316 Implemented by Harsha Jagasia and H.J. Lu.
4318 * Faster memcpy on x86.
4319 Implemented by Ulrich Drepper.
4321 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4322 Implemented by Ulrich Drepper.
4324 * Faster sqrt and sqrtf implemention for some PPC variants.
4325 Implemented by Steven Munroe.
4329 * The following bugs are resolved with this release:
4331 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4332 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4333 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4334 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4335 5071, 5103, 5104, 5112, 5113, 5184, 5186
4337 * More checking functions: fread, fread_unlocked, open*, mq_open.
4338 Implemented by Jakub Jelinek and Ulrich Drepper.
4340 * Extend fortification to C++. Implemented by Jakub Jelinek.
4342 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4343 by not recognizing 'a' as a modifier when those specs are requested.
4344 Implemented by Jakub Jelinek.
4346 * PPC optimizations to math and string functions.
4347 Implemented by Steven Munroe.
4349 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4350 options to be passed. Implemented by Ulrich Drepper.
4352 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4354 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4355 Implemented by Ulrich Drepper.
4357 * Handle private futexes in the NPTL implementation.
4358 Implemented by Jakub Jelinek and Ulrich Drepper.
4360 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4361 Implemented by Roland McGrath and Ulrich Drepper.
4363 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4365 * SHA-256 and SHA-512 based password encryption.
4366 Implemented by Ulrich Drepper.
4368 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4369 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4372 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4373 Implemented by Ulrich Drepper.
4377 * The following bugs are resolved with this release:
4379 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4380 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4381 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4382 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4383 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4384 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4385 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4388 * New Linux interfaces: epoll_pwait, sched_getcpu.
4390 * New generic interfaces: strerror_l.
4392 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4396 * The following bugs are resolved with this release:
4398 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4399 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4400 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4401 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4402 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4403 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4404 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4405 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4406 3225, 3251, 3252, 3253, 3273
4408 * For Linux, the sorting of addresses returned by getaddrinfo now also
4409 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4410 Implemented by Ulrich Drepper.
4412 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4413 Implemented by Ulrich Drepper.
4415 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4417 * New iconv module for MIK. Contributed by Alexander Shopov.
4419 * For sites with broken group and/or passwd database, the auto-propagate
4420 option of nscd can prevent creating ID lookup entries from the results
4421 of a name lookup and vice versa. This usually is no problem but some
4422 site might have problems with the default behavior.
4423 Implemented by Ulrich Drepper.
4425 * Iterating over entire database in NIS can be slow. With the
4426 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4427 to trade time for memory. The entire database will be read at once.
4428 Implemented by Ulrich Drepper.
4430 * The interfaces introduced in RFC 3542 have been implemented by
4433 * Support for the new ELF hash table format was added by Ulrich Drepper.
4435 * Support for priority inheritance mutexes added by Jakub Jelinek and
4438 * Support for priority protected mutexes added by Jakub Jelinek.
4440 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4441 or_IN, csb_PL, fy_NL, sr_ME.
4445 * More overflow detection functions.
4447 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4448 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4450 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4451 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4452 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4453 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4454 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4455 by Masahide Washizawa.
4457 * It is now possible to install audit libraries for the dynamic linker using
4458 LD_AUDIT. Implemented by Ulrich Drepper.
4460 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4461 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4462 For a libc and libpthread that works well on Linux 2.4 kernels, we
4463 recommend using the stable 2.3 branch.
4465 * The new function open_wmemstream acts like open_memstream,
4466 but uses a wchar_t wide character buffer.
4468 * The new function ppoll is an improved version of poll, similar to pselect.
4470 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4471 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4472 renameat, unlinkat, linkat, symlinkat, readlinkat.
4474 * New Linux kernel system calls: unshare,
4475 inotify_init, inotify_add_watch, inotify_rm_watch.
4477 * The euidaccess function is now also known by the alias eaccess,
4478 for compatibility with some other systems.
4480 * Timezone data updated to 2006b version.
4484 * The following bugs are resolved with this release:
4486 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4487 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4488 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4489 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4490 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4491 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4493 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4495 * As of this release, GCC 4 can be used to compile the C Library.
4497 * Timezone data updated to 2005m version.
4501 * The following bugs are resolved with this release:
4503 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4504 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4505 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4506 777, 787, 821, 822, 823, 825
4508 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4512 * Support for RFC 3678. Real implementations exist only for Linux so far.
4513 Implemented by Ulrich Drepper.
4515 * nscd can now cache entries persistently. Expiring entries are reloaded.
4516 For speedups the cache can be shared in memory with client processes.
4517 Implemented by Ulrich Drepper.
4519 * nscd can now perform SELinux checks.
4520 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4522 * getaddrinfo queries are now cached. Canonical name lookup is performed
4524 Implemented by Ulrich Drepper.
4526 * The nothrow function attribute is used when headers are used by gcc when
4527 compiling C code. This can avoid significant amounts of exception
4530 * The malloc functions perform more error checking and are stricter when
4531 it comes to reacting on errors. The default action is to terminate
4532 the process after showing an error message. Implemented by Ulrich Drepper.
4534 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4535 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
4537 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
4538 namespaces using the new function dlmopen(). This feature is of course,
4539 like most other dynamic loading functionality, not available in statically
4540 linked applications. Implemented by Ulrich Drepper.
4542 * Low-overhead boundary checking variants of string and some stdio functions
4543 were added. These are to be used in conjunction with a gcc patch by
4544 Jakub Jelinek which adds calls to these functions if possible.
4545 Implemented by Jakub Jelinek and Ulrich Drepper.
4547 * Old code for several operating systems and machine architectures that
4548 have not been in working condition in a long time have been removed from
4549 the main source tree maintained by the GNU C Library's maintainers.
4550 These files are now reside in the separate `ports' source module
4551 that is usable as an add-on when building the library.
4555 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4556 interrogate the dynamic linker, compatible with the Solaris interface.
4558 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4559 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4561 * getifaddrs now uses the netlink interface on Linux to get its information.
4562 Implemented by Thorsten Kukuk.
4564 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4565 Implemented by Ulrich Drepper.
4567 * support for non-executable stacks on x86 has been added. Changes mostly
4570 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
4573 * getaddrinfo now performs destination address selection according to
4578 * Thread-safe interfaces for many functions that access locale data
4579 were added in version 2.3, but these features were omitted from NEWS.
4580 Many functions have variants with an `_l' suffix that take a `locale_t'
4581 object as a parameter rather than consulting the current locale.
4582 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4583 create and maintain `locale_t' objects. Additionally, the new function
4584 `uselocale' sets "the current locale" (as used by functions not so
4585 parameterized) set for an individual thread. These features were added
4586 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4588 * The functions getresuid, getresgid, setresuid, and setresgid, which
4589 have long been available on Linux, are now declared in <unistd.h>
4590 and are now also available on the Hurd.
4592 * ELF thread-local storage support (TLS) now works on x86-64.
4594 * The new dynamic string token $LIB is expanded in shared library names.
4595 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4597 * Aldy Hernandez contributed complete software floating point support for
4598 PowerPC machines with no FPU.
4600 * fexecve is implemented on Linux.
4602 * The `btowc' function should work at least twice as fast due to
4603 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
4605 * With approriate thread add-ons cancelable functions are now implemented
4606 in libc.so as well. No need to call the function in libpthread. This
4607 change allowed to finally disable the incorrect and expensive handling
4608 of weak definition in ld.so.
4610 * Yet more PLT entries in libc.so have been removed. We finally arrived
4611 at the bare minimum. Startup times improved appropriately.
4613 * Support for the new Linux/x86 system call interface was added. The
4614 AT_SYSINFO auxiliary vector entry is recognized and handled.
4618 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4621 * iconv (the program and the interface) now accepts empty names (excluding
4622 options like //TRANSLIT) to mean "use charset of current locale".
4624 * localedef can now transliterate characters in strings which are not in
4625 the provided charmap. The information from the input locale is used.
4627 * Prelinking support was added for ELF targets. This requires additional
4628 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
4630 * Read-only stdio streams now use mmap to speed up operation by eliminating
4631 copying and buffer underflows. To use add 'm' to the mode string of
4632 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
4634 * The malloc functions were completely rewritten by Wolfram Gloger based
4635 on Doug Lea's malloc-2.7.0.c.
4637 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4638 implementation of regex.
4640 * Bruno Haible upgraded the iconv and locale implementation to support
4643 * Contents of the LC_* and LANG environment variables in the CEN style are
4644 not recognized anymore. It never was used. Change by Ulrich Drepper.
4646 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4647 thread-local storage (TLS) ABI on some platforms.
4648 Changes by Ulrich Drepper. SH support by Kaz Kojima.
4650 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4651 EUC-JISX0213, and TSCII.
4653 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4654 BSD-compatible interface for getting all network interface addresses.
4655 Implementation for IPv4 by Roland McGrath.
4657 * Loading of locale data is faster due to the introduction of a locale
4658 archive. Implemented by Roland McGrath and Ulrich Drepper.
4660 * Startup times are significantly reduced by not using exported functions
4661 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
4664 * Steven Munroe contributed a port to PowerPC64/Linux.
4668 * The Hurd now uses the GNU libio implementation of stdio rather than the
4669 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4671 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4672 with the same behavior as the Linux system call of the same name.
4676 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4677 128-bit long double format.
4679 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4680 IBM1161, and IBM1162 charsets.
4682 * Andreas Jaeger contributed a port to x86-64/Linux.
4684 * Peter Bruin contributed a port to PowerPC/Hurd.
4686 * libc functions using I/O streams now can handle wide-oriented streams
4689 * optimizations in the dynamic linker. Binaries created by recent binutils
4690 versions start up quicker due to reduced time spent on relocations.
4692 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
4696 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
4697 asinh, atanh, j0 for the 128-bit long double format.
4699 * Bruno Haible updated all the code handling Unicode in some form to
4700 support Unicode 3.1.
4702 * Speed of regex for single-byte locales is back to previous levels.
4703 Patch by Isamu Hasegawa.
4705 * Alpha, SPARC, and IA-64 now also using floating stacks.
4707 * Startup time of internationalized applications greatly improved through
4708 iconv cache. Use iconvconfig to generate the cache file.
4709 Contributed by Ulrich Drepper.
4711 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
4712 severe performance problems. Patch by David Mosberger.
4714 * The Hurd port got a lot more functionality like AIO, various stdio
4715 extensions, etc. Mainly done by Roland McGrath.
4717 * mtrace can now lookup symbols in shared libraries.
4721 * Intel's IA-64 math library is largely integrated. It provides fast and
4722 accurate implementatations for most basic and standard math functions
4723 in float, double, and long double format.
4725 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
4726 and asin for the 96-bit long double format and asin, log, tan for the
4727 128-bit long double format.
4729 * The beginning of a last-bit accurate math library by IBM Haifa were added.
4730 The basic double functions exist today. Contributed by Abraham Ziv
4731 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
4732 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
4734 * An asynchronous name lookup library was added. The interface is designed
4735 after POSIX AIO. The proposal was circulated beforehand to get comments.
4736 No negative ones came in. Implemented by Ulrich Drepper.
4738 * Port to S390/64bit contributed by Martin Schwidefsky
4739 <schwidefsky@de.ibm.com>.
4741 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
4742 of functions for Linux/IA-64.
4744 * The RPC code is now thread safe. Threads can now use the same service
4745 of different services at the same time. Patch by Eric Norum
4746 <eric.norum@usask.ca> with some help by Ulrich Drepper.
4748 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
4749 family of functions for Linux/S390.
4751 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
4752 of functions for Linux/x86.
4754 * Port to Linux/CRIS contributed by Axis Communications.
4758 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
4759 we can now check for namespace violations and missing declarations. The
4760 result is that almost all headers are now Unix-compliant (as defined in
4761 the upcoming XPG6). The negative side is that some programs might need
4762 corrections, too, if they depend on the incorrect form of the headers in
4763 previous versions which defined too many symbols and included too many
4766 * regex now handles multibyte character sets correctly.
4767 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
4769 * iconv (the program) does now conform to the upcoming XPG6 and handles
4770 charmaps. Instead of the charset names the path of charmaps can be
4771 provided and the conversion happens based on this data.
4772 Contributed by Ulrich Drepper.
4774 * The locale program now provides detailed information about the installed
4779 only lists the names of the supported locales
4783 provides details such as country, language, and codeset name.
4784 Contributed by Ulrich Drepper.
4788 * The gencat program now parses the input file according to the charset
4789 selected by the LC_CTYPE category. This is important for stateful
4790 character sets. To make generating catalogs easier there is a way
4791 to overwrite the charset selected by the locale: before the first
4792 message or $ quote line the catalog can contain a line like
4794 $ codeset=ISO-8859-2
4796 to select the charset (ISO-8859-2 in this case).
4798 Implemented by Shinya Hanataka and Ulrich Drepper.
4800 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
4801 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
4802 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
4804 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
4805 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
4807 * The LANGUAGE environment variable is now ignored unless the locale is
4808 changed from the default "C" locale.
4810 * The usual bug fixes.
4814 * Greg McGary added runtime support for bounds checking using gcc's
4815 new -fbounded-pointers option. ix86 target is complete. PowerPC
4818 * Thorsten Kukuk added secure mode support to nscd.
4820 * The Berkeley db libraries have been removed.
4822 Related, the nss_db module is now in a separate package since it
4823 obviously requires a database library being available.
4825 * Wide character I/O streams implemented by Ulrich Drepper.
4827 * Functions from the extended socket API added by Ulrich Drepper.
4829 * Functions feenableexcept and fedisableexcept to control the
4830 behaviour of individual exceptions have been added by Andreas Jaeger.
4832 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
4834 * The resolver code has been updated from bind 8.2.3-T5B which supports
4835 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
4838 This change could in some situations effect backward compatibility. Since
4839 now `_res' is a thread-local instead of a global variable, modifying it
4840 in one thread does not have any effect in other threads.
4842 The resolver library was also extended to allow IPv6 as the transport
4843 protocol for the requests. This work was done by Stig Venaas.
4845 * Compatibility code for K&R C compilers has been removed from the
4846 header files. A ISO C compiler is needed to use the library
4847 (conforming to either C89 or C99 standard).
4849 * Complete rewrite of the localedef program to support multibyte character
4850 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
4851 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
4852 Implemented by Ulrich Drepper.
4854 Bruno Haible significantly improved the generation and use of the data
4855 structures for the wide character tables.
4857 * Plural handling in gettext implemented by Ulrich Drepper.
4859 * The utmp daemon has been removed.
4861 * The port to MIPS-Linux has been finished by Andreas Jaeger.
4863 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
4866 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
4868 * POSIX barriers implemented by Kaz Kylheku.
4870 * POSIX spawn function family implemented by Ulrich Drepper.
4872 * POSIX spinlocks are now available.
4874 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
4876 * the configure option --enable-kernel=X.Y.Z allows to strip out
4877 compatibility for kernel versions before X.Y.Z. This is currently only
4878 implemented for Linux.
4880 * the sockaddr_in6 structure changed. The IPv6 working group added a new
4881 field sin6_scope_id. This means that all programs using IPv6 should be
4882 recompiled. Don't expect binary compatibility with previous glibc
4885 * various conversion modules for IBM character sets contributed by
4888 * IA-64 port by Jes Sorensen and HJ Lu.
4902 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
4904 * New xdr functions are added; some rpc functions are now 64bit clean.
4906 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
4908 * Fixed known incompatibilities with glibc 2.0.
4910 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
4912 * Optimized a number of functions (especially the ELF dynamic loader).
4914 * Update timezone data files.
4916 * lots of charmaps corrections
4918 * some new locale definitions and charmaps
4923 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
4924 conform to POSIX member type requirements. Symbol versions have been
4925 adjusted as needed within the library, and for direct use by applications,
4926 but there is potential for problems if third-party libraries use
4927 struct timeval as part of their interface. This does not present
4928 a problem for X and other "essential" system libraries.
4930 * An additional locale model to support C++ Standard Library locale
4931 model and probably more was implemented by Ulrich Drepper.
4933 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
4936 * Miles Bader provided the `argp' function family to support hierachical
4937 command line argument parsing, layered on top of getopt.
4939 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
4941 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
4944 * scanf recognizes the %a and %A format for scanning floating point numbers.
4946 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
4947 information and interfaces for the available integer types.
4949 * about 130 new math functions were added to implement the ISO C9x math
4952 * the new header <complex.h> contains definitions of the complex math
4953 functions from ISO C 9X.
4955 * the new header <tgmath.h> defines generic macros to use complex or
4956 real valued functions.
4958 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
4960 * Andreas Jaeger provided a test suite for the math library.
4962 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
4964 * Ulrich Drepper added character set conversion functions (iconv).
4966 * Optimized string functions have been added.
4968 * The localedata addon is now part of glibc.
4970 * An implementation of profiling shared libraries was added by Ulrich Drepper.
4972 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
4973 daemon for NSS (nscd).
4975 Missing a better place here are some numbers on improvements. Under
4976 Linux 2.1.125 un-tar-ing the kernel sources takes
4980 using local files 12.19s 6.88s 22.91s
4982 using NIS 13.92s 8.91s 26.34s
4984 using NIS & nscd 10.37s 7.34s 25.30s
4986 using NIS+ 27.57s 30.37s 640.46s
4988 using NIS+ & nscd 10.25s 7.83s 26.51s
4990 using NIS & old nscd [1] 13.83s 8.32s 29.60s
4992 Keep in mind that non-namelookup related operations dominate above times.
4993 It was just a common complain that using NIS+ unpacking the kernel is
4996 [1] The old nscd implementation is not available anymore since it was
4997 distributed with glibc up to version 2.0.98 and thus is now replaced.
4999 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5001 * Mark Kettenis provided a Hesiod NSS module.
5003 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5004 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5006 * rcmd can now handle netgroups (Dick Streefland).
5008 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5011 * Support for the IPv6 protocol has been added to the socket API, as per the
5012 latest draft standards.
5014 * Support for Linux 2.2 has been added.
5016 * Interface changes relative to the latest 2.0.x release:
5017 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5018 addseverity NEW: Unix98
5019 alphasort64 NEW: LFS
5020 argp_err_exit_status NEW: argp, GNU ext
5021 argp_error NEW: argp, GNU ext
5022 argp_failure NEW: argp, GNU ext
5023 argp_help NEW: argp, GNU ext
5024 argp_parse NEW: argp, GNU ext
5025 argp_program_bug_address NEW: argp, GNU ext
5026 argp_program_version NEW: argp, GNU ext
5027 argp_program_version_hook NEW: argp, GNU ext
5028 argp_state_help NEW: argp, GNU ext
5029 argp_usage NEW: argp, GNU ext
5030 authdes_create NEW: Secure RPC
5031 authdes_getucred NEW: Secure RPC
5032 authdes_pk_create NEW: Secure RPC
5033 backtrace NEW: GNU ext.
5034 backtrace_symbols NEW: GNU ext.
5035 backtrace_symbols_fd NEW: GNU ext.
5037 cacosf NEW: ISO C 9x
5038 cacosh NEW: ISO C 9x
5039 cacoshf NEW: ISO C 9x
5040 cacoshl NEW: ISO C 9x
5041 cacosl NEW: ISO C 9x
5048 casinf NEW: ISO C 9x
5049 casinh NEW: ISO C 9x
5050 casinhf NEW: ISO C 9x
5051 casinhl NEW: ISO C 9x
5052 casinl NEW: ISO C 9x
5054 catanf NEW: ISO C 9x
5055 catanh NEW: ISO C 9x
5056 catanhf NEW: ISO C 9x
5057 catanhl NEW: ISO C 9x
5058 catanl NEW: ISO C 9x
5059 cbc_crypt NEW: Secure RPC
5063 ccoshf NEW: ISO C 9x
5064 ccoshl NEW: ISO C 9x
5070 cimagf NEW: ISO C 9x
5071 cimagl NEW: ISO C 9x
5072 clearerr_locked REMOVED
5073 clntunix_create NEW: sunrpc ext
5075 clog10 NEW: ISO C 9x
5076 clog10f NEW: ISO C 9x
5077 clog10l NEW: ISO C 9x
5087 cprojf NEW: ISO C 9x
5088 cprojl NEW: ISO C 9x
5090 crealf NEW: ISO C 9x
5091 creall NEW: ISO C 9x
5096 csinhf NEW: ISO C 9x
5097 csinhl NEW: ISO C 9x
5100 csqrtf NEW: ISO C 9x
5101 csqrtl NEW: ISO C 9x
5105 ctanhf NEW: ISO C 9x
5106 ctanhl NEW: ISO C 9x
5108 des_setparity NEW: Secure RPC
5109 ecb_crypt NEW: Secure RPC
5110 endutxent NEW: Unix98
5112 exp10f NEW: ISO C 9x
5113 exp10l NEW: ISO C 9x
5117 fattach NEW: STREAMS
5118 fdetach NEW: STREAMS
5122 feclearexcept NEW: ISO C 9x
5123 fegetenv NEW: ISO C 9x
5124 fegetexceptflag NEW: ISO C 9x
5125 fegetround NEW: ISO C 9x
5126 feholdexcept NEW: ISO C 9x
5128 feraiseexcept NEW: ISO C 9x
5129 ferror_locked REMOVED
5130 fesetenv NEW: ISO C 9x
5131 fesetexceptflag NEW: ISO C 9x
5132 fesetround NEW: ISO C 9x
5133 fetestexcept NEW: ISO C 9x
5134 feupdateenv NEW: ISO C 9x
5135 fflush_locked REMOVED
5139 fgets_unlocked NEW: GNU ext.
5140 fileno_locked REMOVED
5152 fputc_locked REMOVED
5153 fputs_unlocked NEW: GNU ext.
5154 fread_unlocked NEW: GNU ext.
5159 fstatvfs NEW: Unix98
5163 ftruncate64 NEW: LFS
5165 fwrite_unlocked NEW: GNU ext.
5166 gai_strerror NEW: IPv6
5170 getchar_locked REMOVED
5172 getdate_err NEW: Unix98
5173 getdate_r NEW: GNU ext.
5175 getnameinfo NEW: IPv6
5176 getnetname NEW: Secure RPC
5177 getpmsg NEW: STREAMS
5178 getpt NEW: Unix98 PTY
5179 getrlimit64 NEW: LFS
5180 getutxent NEW: Unix98
5181 getutxid NEW: Unix98
5182 getutxline NEW: Unix98
5183 glob64 NEW: GNU ext.
5184 globfree64 NEW: GNU ext.
5185 gnu_get_libc_release NEW: GNU ext.
5186 gnu_get_libc_version NEW: GNU ext.
5187 grantpt NEW: Unix98 PTY
5188 host2netname NEW: Secure RPC
5190 iconv_close NEW: iconv
5191 iconv_open NEW: iconv
5192 if_freenameindex NEW: IPv6
5193 if_indextoname NEW: IPv6
5194 if_nameindex NEW: IPv6
5195 if_nametoindex NEW: IPv6
5196 in6addr_any NEW: IPv6
5197 in6addr_loopback NEW: IPv6
5198 inet6_isipv4mapped NEW: IPv6
5199 isastream NEW: STREAMS
5200 iswblank NEW: GNU ext.
5201 key_decryptsession NEW: Secure RPC
5202 key_decryptsession_pk NEW: Secure RPC
5203 key_encryptsession NEW: Secure RPC
5204 key_encryptsession_pk NEW: Secure RPC
5205 key_gendes NEW: Secure RPC
5206 key_get_conv NEW: Secure RPC
5207 key_secretkey_is_set NEW: Secure RPC
5208 key_setnet NEW: Secure RPC
5209 key_setsecret NEW: Secure RPC
5210 llrint NEW: ISO C 9x
5211 llrintf NEW: ISO C 9x
5212 llrintl NEW: ISO C 9x
5213 llround NEW: ISO C 9x
5214 llroundf NEW: ISO C 9x
5215 llroundl NEW: ISO C 9x
5220 lrintf NEW: ISO C 9x
5221 lrintl NEW: ISO C 9x
5222 lround NEW: ISO C 9x
5223 lroundf NEW: ISO C 9x
5224 lroundl NEW: ISO C 9x
5226 makecontext NEW: Unix98
5227 mempcpy NEW: GNU ext.
5230 modify_ldt NEW: kernel
5234 nearbyint NEW: ISO C 9x
5235 nearbyintf NEW: ISO C 9x
5236 nearbyintl NEW: ISO C 9x
5237 netname2host NEW: Secure RPC
5238 netname2user NEW: Secure RPC
5239 nexttoward NEW: ISO C 9x
5240 nexttowardf NEW: ISO C 9x
5241 nexttowardl NEW: ISO C 9x
5245 passwd2des NEW: Secure RPC
5247 pow10f NEW: GNU ext.
5248 pow10l NEW: GNU ext.
5251 printf_size NEW: GNU ext.
5252 printf_size_info NEW: GNU ext.
5253 profil_counter REMOVED
5254 pthread_mutexattr_getkind_np REPLACED
5255 pthread_mutexattr_setkind_np REPLACED
5256 ptsname NEW: Unix98 PTY
5257 ptsname_r NEW: Unix98 PTY
5259 putchar_locked REMOVED
5260 putgrent NEW: GNU ext.
5262 putpmsg NEW: STREAMS
5263 pututxline NEW: Unix98
5267 readdir64_r NEW: LFS
5268 remquo NEW: ISO C 9x
5269 remquof NEW: ISO C 9x
5270 remquol NEW: ISO C 9x
5272 roundf NEW: ISO C 9x
5273 roundl NEW: ISO C 9x
5275 scalbln NEW: ISO C 9x
5276 scalblnf NEW: ISO C 9x
5277 scalblnl NEW: ISO C 9x
5279 sendfile NEW: kernel
5280 setcontext NEW: Unix98
5281 setrlimit64 NEW: LFS
5282 setutxent NEW: Unix98
5284 sigignore NEW: Unix98
5285 sigqueue NEW: POSIX.1b
5286 sigrelse NEW: Unix98
5287 sigset NEW: POSIX.1b
5288 sigtimedwait NEW: POSIX.1b
5289 sigwaitinfo NEW: POSIX.1b
5290 sincos NEW: GNU ext.
5291 sincosf NEW: GNU ext.
5292 sincosl NEW: GNU ext.
5296 strcasestr NEW: GNU ext.
5297 strtoimax NEW: ISO C 9x
5298 strtoumax NEW: ISO C 9x
5299 strverscmp NEW: GNU ext.
5300 svcauthdes_stats NEW: Secure RPC
5301 svcunix_create NEW: sunrpc etx
5302 svcunixfd_create NEW: sunrpc ext
5303 swapcontext NEW: Unix98
5304 tcgetsid NEW: Unix98 PTY
5305 tdestroy NEW: GNU ext.
5306 tgamma NEW: ISO C 9x
5307 tgammaf NEW: ISO C 9x
5308 tgammal NEW: ISO C 9x
5312 truncf NEW: ISO C 9x
5313 truncl NEW: ISO C 9x
5315 unlockpt NEW: Unix98 PTY
5316 updwtmpx NEW: Unix98
5317 user2netname NEW: Secure RPC
5318 utmpxname NEW: Unix98
5319 versionsort NEW: GNU ext.
5320 versionsort64 NEW: GNU ext.
5322 wcscasecmp NEW: GNU ext.
5323 wcsncasecmp NEW: GNU ext.
5324 wcsnlen NEW: GNU ext.
5325 wcstoimax NEW: ISO C 9x
5326 wcstoll NEW: ISO C 9x
5327 wcstoull NEW: ISO C 9x
5328 wcstoumax NEW: ISO C 9x
5330 wordexp NEW: POSIX.2
5331 wordfree NEW: POSIX.2
5332 write_profiling REMOVED
5333 xdecrypt NEW: Secure RPC
5334 xdr_authdes_cred NEW: Secure RPC
5335 xdr_authdes_verf NEW: Secure RPC
5336 xdr_cryptkeyarg NEW: Secure RPC
5337 xdr_cryptkeyarg2 NEW: Secure RPC
5338 xdr_cryptkeyres NEW: Secure RPC
5339 xdr_getcredres NEW: Secure RPC
5340 xdr_key_netstarg NEW: Secure RPC
5341 xdr_key_netstres NEW: Secure RPC
5342 xdr_keybuf NEW: Secure RPC
5343 xdr_keystatus NEW: Secure RPC
5344 xdr_netnamestr NEW: Secure RPC
5345 xdr_sizeof NEW: Secure RPC
5346 xdr_unixcred NEW: sunrpc ext
5347 xencrypt NEW: Secure RPC
5348 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5359 * inet_ntoa is thread-safe
5361 * updwtmp is moved from libutil to libc
5363 * rewrite of cbrt function
5365 * update of timezone data
5379 * add atoll function
5381 * fix complex problems in Berkeley DB code
5383 * fix math functions
5387 * fixed lots of header problems (especially Linux/GNU specific)
5389 * dynamic loader preserves all registers
5391 * Roland McGrath provided support for handling of auxiliary objects in
5392 the ELF dynamic loader.
5394 * support for parallel builds is improved
5398 * GNU extensions are no longer declared by default. To enable them you
5399 must define the macro `_GNU_SOURCE' in your program or compile with
5402 * The library has changed from using GNU ld symbol aliases to using weak
5403 symbols where available. The ELF object file format supports weak
5404 symbols; GNU ld also supports weak symbols in the a.out format. (There
5405 is also now support for other GNU ld extensions in ELF. Use the
5406 `--with-elf' option to configure to indicate you have ELF, and
5407 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5408 of many files which contained only symbol aliases, reducing the size of
5409 the source and the compiled library; many other files were renamed to
5410 less cryptic names previously occupied by the symbol alias files.
5411 There is a new header file <elf.h> for programs which operate on
5412 files in the ELF format.
5414 * Converted to Autoconf version 2, so `configure' has more options.
5415 Run `configure --help' to see the details.
5417 * The library can now be configured to build profiling, highly-optimized
5418 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5419 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5420 `configure' enable building these extra libraries. The shared library is
5421 built by default when using both ELF and GNU ld. When shared libraries
5422 are enabled, the new library `-ldl' is available for arbitrary run-time
5423 loading of shared objects; its interface is defined in <dlfcn.h>. The
5424 new header file <link.h> gives access to the internals of the run-time
5425 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5426 application of same name on other systems and it provides information
5427 about dynamically linked binaries.
5429 * The C library now provides the run-time support code for profiling
5430 executables compiled with `-pg'. Programs can control the profiling code
5431 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5432 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5433 the support for this file format was contributed by David Mosberger-Tang.
5435 * The math code has been replaced with a math library based on fdlibm from
5436 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5437 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5438 functions. The math functions now reside in a separate library, so
5439 programs using them will need to use `-lm' their linking commands.
5441 * John C. Bowman contributed optimized ix87 assembler inline functions.
5443 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5444 mechanism similar to that found in Solaris 2. This is now used for the
5445 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5446 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5447 file controls what services are used for each individual database. This
5448 works by loading shared libraries with names specified in `nsswitch.conf',
5449 so service modules can be changed or added at any time without even
5450 relinking any program. Currently there are the file, db, and NIS based
5451 NSS services available.
5453 * The new functions `strtoq' and `strtouq' parse integer values from
5454 strings, like `strtol' and `strtoul', but they return `long long int' and
5455 `unsigned long long int' values, respectively (64-bit quantities).
5457 * The new functions `strtof' and `strtold' parse floating-point values from
5458 strings, like `strtod', but they return `float' and `long double' values,
5459 respectively (on some machines `double' and `long double' are the same).
5461 * Ulrich Drepper has contributed new implementations of the floating-point
5462 printing and reading code used in the `printf' family of functions and
5463 `strtod', `strtof', and `strtold'. These new functions are perfectly
5464 accurate, and much faster than the old ones.
5466 * The implementation of the POSIX locale model was completely rewritten by
5467 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5468 to compile the POSIX locale definition.
5470 * The former dummy implementations of the strcoll and strxfrm function are
5471 now replaced by fully functional code contributed by Ulrich Drepper. The
5472 collation information comes from the POSIX locale definitions.
5474 * The new header <langinfo.h> defines an interface for accessing
5475 various locale-dependent data (using the locale chosen with `setlocale').
5477 * Ulrich Drepper has contributed a new suite of functions for operation on
5478 wide-character and multibyte-character strings, in <wchar.h>;
5479 and classification and case conversion of wide characters, in <wctype.h>.
5480 These new functions are conforming to the ISO C, Amendement 1 specification.
5482 * There is now a second implementation of the standard I/O library available.
5483 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5484 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5486 * You can now use positional parameter specifications in format strings
5487 for the `printf' and `scanf' families of functions. For example,
5488 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5489 ``Number 6, Mr Jones''. This is mainly useful when providing different
5490 format strings for different languages, whose grammars may dictate
5491 different orderings of the values being printed. To support this
5492 feature, the interface for `register_printf_handler' has changed; see
5493 the header file <printf.h> for details.
5495 * The `printf' and `scanf' families of functions now understand a new
5496 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5497 to group numbers as indicated by the locale; for `scanf' and friends, this
5498 says to accept as valid only a number with all the proper grouping
5499 separators in the right places. In the default "C" locale, numbers are
5500 not grouped; but locales for specific countries will define the usual
5501 conventions (i.e. separate thousands with `,' in the US locale).
5503 * The pgrp functions have been regularized, slightly incompatibly but much
5504 less confusingly. The core functions are now `getpgid' and `setpgid',
5505 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5506 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5507 provided for compatibility. There is no longer an incompatible `getpgrp'
5508 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5510 * The new header file <fts.h> and suite of functions simplify programs that
5511 operate on directory trees. This code comes from 4.4 BSD.
5513 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5514 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5515 NSS scheme used in glibc.
5517 * There is a new malloc debugging hook `__memalign_hook'.
5519 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5520 `unsigned int' in <sys/types.h>. These are for compatibility only and
5521 their use is discouraged.
5523 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5524 done differently, so that it works even without GNU ld.
5526 * New function `euidaccess' checks allowed access to a file like `access',
5527 but using the effective IDs instead of the real IDs.
5529 * The time zone data files have been updated for the latest and greatest
5530 local time conventions of the countries of the world.
5532 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5535 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5536 for formatting floating-point numbers. They are provided only for
5537 compatibility; new programs should use `sprintf' instead. There are
5538 also equivalent function for the `long double' floating-point type and
5539 all functions also exist in a reentrant form.
5541 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5542 functions for maintaining the login-record files (primarily of use to
5543 system programs such as `login'), and convenient functions for
5544 allocating and initializing a pseudo-terminal (pty) device.
5546 * Ulrich Drepper has contributed new support for System V style
5547 shared memory and IPC on systems that support it.
5549 * Ulrich Drepper has contributed several miscellaneous new functions found
5550 in System V: The `hsearch' family of functions provide an effective
5551 implementation of hash tables; `a64l' and `l64a' provide a very simple
5552 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5555 * Ulrich Drepper has contributed new reentrant counterparts for the
5556 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5558 * Ulrich Drepper has contributed new, highly-optimized versions of several
5559 string functions for the i486/Pentium family of processors.
5561 * Ulrich Drepper has updated the Linux-specific code, based largely
5562 on work done in Hongjiu Lu's version of GNU libc for Linux.
5563 The GNU library now supports Linux versions 2.0.10 and later,
5564 using the ELF object file format (i[3456]86-*-linux).
5566 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5568 * David Mosberger-Tang and Richard Henderson have ported the C library
5569 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
5570 dynamic linking support for ELF/Alpha.
5572 * Richard Henderson contributed several Alpha optimized assembler function
5573 for arithmetic and string handling.
5575 * Ulrich Drepper has contributed a new set of message catalog functions to
5576 support multiple languages using the <libintl.h> interface, for use with
5577 his new package GNU gettext. Translation volunteers have contributed
5578 catalogs of the library's messages in Spanish, German, and Korean.
5580 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5581 program and the `catgets' function for reading the catalog files it
5582 creates. (The <libintl.h> interface is preferred; we include the
5583 <nl_types.h> interface using `catgets' only for source compatibility with
5584 programs already written to use it.)
5586 * New header file <values.h> gives SVID-compatible names for <limits.h>
5589 * Various new macros, declarations, and small header files for compatibility
5592 * New function `group_member' is a convenient way to check if a process has
5593 a given effective group ID.
5595 * When using GCC 2.7 and later, the socket functions are now declared in a
5596 special way so that passing an argument of type `struct sockaddr_in *',
5597 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5598 `struct sockaddr *' type, does not generate a type-clash warning.
5600 * New function `error' declared in header file <error.h> is a convenient
5601 function for printing error messages and optionally exiting; this is the
5602 canonical function used in GNU programs. The new functions `err', `warn',
5603 and friends in header file <err.h> are the canonical 4.4 BSD interface for
5604 doing the same thing.
5606 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5607 POSIX.2 `glob' function to do ~ and {...} expansion.
5609 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5610 `clearenv' which is used in POSIX.9 is also available.
5612 * New function `getsid' returns session ID number on systems that support it.
5614 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
5615 files <db.h> and <mpool.h> provide a rich set of functions for several
5616 types of simple databases stored in memory and in files, and <ndbm.h> is
5617 an old `ndbm'-compatible interface using the `db' functions. Link with
5618 `-ldb' to get these functions.
5620 * New macro `strdupa' copies a string like `strdup', but uses local stack
5621 space from `alloca' instead of dynamic heap space from `malloc'.
5623 * New function `strnlen' is like `strlen' but searches only a given maximum
5624 number of characters for the null terminator. `stpncpy', `strndup' and
5625 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5628 * New function `statfs' in header <sys/statfs.h>.
5630 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5631 provide convenient functions for operating on blocks of null-terminated
5634 * A new suite of functions in <utmp.h> handle all the details of reading
5635 and writing the utmp file.
5637 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5640 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5641 completely POSIX compliant and also implemented the extended functionality
5642 to handle alternate digit representation and alternate era date formats.
5644 * Ulrich Drepper provided an implementation of the `strptime' function
5645 defined in XPG4.2 which transforms a string into a `struct tm' value.
5647 * Paul Eggert provided the tzselect shell script as part of the timezone
5648 code. The shell script makes it easy to select the correct timezone
5651 * The implementation of the malloc family of functions is completely replaced
5652 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5653 The implementation uses the mmap function (if available) and it is
5654 optimized for the use in multi threaded programs.
5656 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5657 functions. This new functionality is usable by specifying a special
5658 salt string and it is compatible with implementation on *BSD systems.
5660 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5661 `getsubopt' to handle second level command line options, `bsd_signal'
5662 to access BSD style `signal' functionality, the obsolete `regexp' style
5665 * the `lchown' function is available on system which support this
5668 * The implementation of the shadow password handling function was contributed
5671 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5673 * POSIX.1g support was added. The <sys/select.h> header is available,
5674 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
5675 implementation of `getaddrinfo'.
5679 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5681 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5682 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
5684 * The new function `daemon' from 4.4 BSD is useful for server programs that
5685 want to put themselves in the background.
5687 * Joel Sherrill has contributed support for several standalone boards that
5688 run without an operating system.
5690 * `printf', `scanf' and friends now accept a `q' type modifier for long
5691 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
5693 * All of the code taken from BSD (notably most of the math and networking
5694 routines) has been updated from the BSD 4.4-Lite release.
5696 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
5698 * The new functions `getdomainname' and `setdomainname' fetch or change the
5699 YP/NIS domain name. These are system calls which exist on systems which
5702 * The time zone data files have been updated for the latest international
5705 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
5706 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
5710 * The C library now includes support for Sun RPC, from Sun's free
5711 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
5712 are included. (There is still no support for YP.)
5714 * Tom Quinn has contributed a port of the C library to SGI machines running
5715 Irix 4 (mips-sgi-irix4).
5717 * The new `lockf' function is a simplified interface to the locking
5718 facilities of `fcntl', included for compatibility.
5720 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
5722 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
5724 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
5727 * The error message printed by `assert' for a failed assertion now includes
5728 the name of the program (if using GNU ld) and the name of the calling
5729 function (with versions of GCC that support this).
5731 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
5733 * The library now includes the <sys/mman.h> header file and memory
5734 management functions `mmap', `munmap', `mprotect', `msync', and
5735 `madvise', on systems that support those facilities.
5737 * The interface for `mcheck' has changed slightly: the function called to
5738 abort the program when an allocation inconsistency is detected now takes
5739 an argument that indicates the type of failure. The new function
5740 `mprobe' lets you request a consistency check for a particular block at
5741 any time (checks are normally done only when you call `free' or `realloc'
5744 * It is now possible to easily cross-compile the C library, building on one
5745 system a library to run on another machine and/or operating system. All
5746 you need to do is set the variable `HOST_CC' in `configparms' to the
5747 native compiler for programs to run on the machine you are building on (a
5748 few generator programs are used on Unix systems); set `CC' to the
5751 * The new function `fexecve' (only implemented on the GNU system) executes
5752 a program file given a file descriptor already open on the file.
5756 * Brendan Kehoe has contributed most of a port to the DEC Alpha
5757 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
5759 * You can set the variable `libprefix' in `configparms' to specify a prefix
5760 to be prepended to installed library files; this makes it easy to install
5761 the GNU C library to be linked as `-lgnuc' or whatever.
5763 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
5764 copies a limited number of characters from a string, and returns the
5765 address of the last character written.
5767 * You no longer need to check for whether the installed `stddef.h' is
5768 compatible with the GNU C library. configure now checks for you.
5770 * You can now define a per-stream `fileno' function to convert the
5771 stream's cookie into an integral file descriptor.
5773 * ``malloc (0)'' no longer returns a null pointer. Instead, it
5774 allocates zero bytes of storage, and returns a unique pointer which
5775 you can pass to `realloc' or `free'. The behavior is undefined if
5776 you dereference this pointer.
5778 * The C library now runs on Sony NEWS m68k machines running either
5779 NewsOS 3 or NewsOS 4.
5781 * The new `syscall' function is a system-dependent primitive function
5782 for invoking system calls. It has the canonical behavior on Unix
5783 systems, including unreliable return values for some calls (such as
5784 `pipe', `fork' and `getppid').
5786 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
5787 to `EAGAIN', which is the preferred name. On systems whose kernels
5788 use two distinct codes, the C library now translates EWOULDBLOCK to
5789 EAGAIN in every system call function.
5793 * The GNU C Library Reference Manual is now distributed with the library.
5794 `make dvi' will produce a DVI file of the printed manual.
5795 `make info' will produce Info files that you can read on line using C-h i
5796 in Emacs or the `info' program.
5797 Please send comments on the manual to bug-glibc-manual@gnu.org.
5799 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
5801 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
5803 * Jason Merrill has contributed a port to the Sequent Symmetry running
5804 Dynix version 3 (i386-sequent-dynix).
5806 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
5807 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
5809 * New function `memory_warnings' lets you arrange to get warnings when
5810 malloc is running out of memory to allocate, like Emacs gives you.
5812 * The C library now contains the relocating allocator used in Emacs 19 for
5813 its editing buffers. This allocator (ralloc) minimizes allocation
5814 overhead and fragmentation by moving allocated regions around whenever it
5815 needs to. You always refer to a ralloc'd region with a "handle" (a
5816 pointer to a pointer--an object of type `void **').
5818 * There is a new `printf' format: `%m' gives you the string corresponding
5819 to the error code in `errno'.
5821 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
5822 or `%[' conversion, but instead of filling in a fixed-sized buffer you
5823 pass, the `a' modifier says to fill in a `char **' you pass with a
5826 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
5827 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
5828 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
5830 * `mkstemp' is a traditional Unix function to atomically create and open a
5831 uniquely-named temporary file.
5835 * The standard location for the file that says what the local timezone is
5836 has changed again. It is now `/usr/local/etc/localtime' (or more
5837 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
5839 * The distribution no longer contains any files with names longer than 14
5842 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
5843 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
5845 * New functions `ttyslot' and `syslog' from 4.4 BSD.
5849 * The configuration process has changed quite a bit. The `configure'
5850 script is now used just like the configuration scripts for other GNU
5851 packages. The `sysdeps' directory hierarchy is much rearranged.
5852 The file `INSTALL' explains the new scheme in detail.
5854 * The header files no longer need to be processed into ANSI C and
5855 traditional C versions. There is just one set of files to install, and
5856 it will work with ANSI or old C compilers (including `gcc -traditional').
5858 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
5859 MIPS DECStation running Ultrix 4.
5861 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
5862 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
5863 made itself into a shared library.
5865 * Yet further improved support for the i386, running 4.3 BSD-like systems
5866 (such as Mach 3 with the Unix single-server), or System V.
5868 * New function `strncasecmp' to do case-insensitive string comparison
5869 with limited length.
5871 * New function `strsep' is a reentrant alternative to `strtok'.
5873 * New functions `scandir' and `alphasort' for searching directories.
5875 * New function `setenv' is a better interface to `putenv'.
5877 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
5878 function for traversing a directory tree.
5880 * The GNU obstack package is now also part of the C library.
5881 The new function `open_obstack_stream' creates a stdio stream that
5882 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
5883 formatted output directly to an obstack.
5885 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
5886 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
5888 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
5890 * The new functions `strfry' and `memfrob' do mysterious and wonderful
5891 things to your strings.
5893 * There are some new test programs: test-fseek, testmb, and testrand.
5895 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
5896 These ports are not finished, but are a good starting place for really
5897 supporting those systems.
5899 * `/etc/localtime' is now the standard location for the file that says what
5900 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
5901 This follows the general principle that `/etc' is the place for all local
5902 configuration files.
5904 * The C library header files now use `extern "C"' when used by the C++
5905 compiler, so the C library should now work with C++ code.
5907 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
5908 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
5911 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
5912 function which uses the `merge sort' algorithm, and is said to be
5913 significantly faster than the old GNU `qsort' function. Merge sort is
5914 now the standard `qsort' function. The new algorithm can require a lot
5915 of temporary storage; so, the old sorting function is called when the
5916 required storage is not available.
5918 * The C library now includes Michael Glad's Ultra Fast Crypt, which
5919 provides the Unix `crypt' function, plus some other entry points.
5921 * The code and header files taken from 4.4 BSD have been updated with the
5922 latest files released from Berkeley.
5924 ----------------------------------------------------------------------
5925 Copyright information:
5927 Copyright (C) 1992-2020 Free Software Foundation, Inc.
5929 Permission is granted to anyone to make or distribute verbatim copies
5930 of this document as received, in any medium, provided that the
5931 copyright notice and this permission notice are preserved,
5932 thus giving the recipient permission to redistribute in turn.
5934 Permission is granted to distribute modified versions
5935 of this document, or of portions of it,
5936 under the above conditions, provided also that they
5937 carry prominent notices stating who last changed them.
5940 version-control: never