1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2021 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 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _SC_SIGSTKSZ_SOURCE or
13 _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
14 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
15 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
17 * The dynamic linker implements the --list-diagnostics option, printing
18 a dump of information related to IFUNC resolver operation and
19 glibc-hwcaps subdirectory selection.
21 * On Linux, the function execveat has been added. It operates similar to
22 execve and it is is already used to implement fexecve without requiring
23 /proc to be mounted. However, different than fexecve, if the syscall is not
24 supported by the kernel an error is returned instead of trying a fallback.
26 * The ISO C2X function timespec_getres has been added.
28 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
29 C2X, is supported to enable declarations of functions defined in Annex F
30 of C2X. Those declarations are also enabled when
31 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
32 defined, and when _GNU_SOURCE is defined.
34 * On powerpc64*, glibc can now be compiled without scv support using the
35 --disable-scv configure option.
37 * Add support for 64-bit time_t for ABIs with defaults to 32-bit time_t.
38 This is enabled with the _TIME_BITS preprocessor set to 64 and only
39 supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is only
40 enabled for Linux and the full support requires a minimum version of 5.1.
42 Deprecated and removed features, and other changes affecting compatibility:
44 * The function pthread_mutex_consistent_np has been deprecated; programs
45 should use the equivalent standard function pthread_mutex_consistent
48 * The function pthread_mutexattr_getrobust_np has been deprecated;
49 programs should use the equivalent standard function
50 pthread_mutexattr_getrobust instead.
52 * The function pthread_mutexattr_setrobust_np has been deprecated;
53 programs should use the equivalent standard function
54 pthread_mutexattr_setrobust instead.
56 * The function pthread_yield has been deprecated; programs should use
57 the equivalent standard function sched_yield instead.
59 Changes to build and runtime requirements:
61 * On Linux, the shm_open, sem_open, and related functions now expect the
62 file shared memory file system to be mounted at /dev/shm. These functions
63 no longer search among the system's mount points for a suitable
64 replacement if /dev/shm is not available.
66 Security related changes:
68 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
69 a request for netgroup lookup, may crash due to a double-free,
70 potentially resulting in degraded service or Denial of Service on the
71 local system. Reported by Chris Schanzle.
73 CVE-2021-33574: The mq_notify function has a potential use-after-free
74 issue when using a notification type of SIGEV_THREAD and a thread
75 attribute with a non-default affinity mask.
77 The following bugs are resolved with this release:
79 [The release manager will add the list generated by
80 scripts/list-fixed-bugs.py just before the release.]
87 * The dynamic linker accepts the --list-tunables argument which prints
88 all the supported tunables. This option is disable if glibc is
89 configured with tunables disabled (--enable-tunables=no).
91 * The dynamic linker accepts the --argv0 argument and provides opportunity
92 to change argv[0] string.
94 * The dynamic linker loads optimized implementations of shared objects
95 from subdirectories under the glibc-hwcaps directory on the library
96 search path if the system's capabilities meet the requirements for
97 that subdirectory. Initially supported subdirectories include
98 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
99 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
100 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
101 subdirectory names correspond to the vendor-independent x86-64
102 microarchitecture levels defined in the x86-64 psABI supplement.
104 * The new --help option of the dynamic linker provides usage and
105 information and library search path diagnostics.
107 * The mallinfo2 function is added to report statistics as per mallinfo,
108 but with larger field widths to accurately report values that are
109 larger than fit in an integer.
111 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
113 * Support for the RISC-V ISA running on Linux has been expanded to run on
114 32-bit hardware. This is supported for the following ISA and ABI pairs:
120 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
123 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
124 glibc may use additional checks that may have an additional performance
125 overhead. At present these checks are available only on LLVM 9 and later.
126 The latest GCC available at this time (10.2) does not support this level of
129 Deprecated and removed features, and other changes affecting compatibility:
131 * The mallinfo function is marked deprecated. Callers should call
134 * When dlopen is used in statically linked programs, alternative library
135 implementations from HWCAP subdirectories are no longer loaded.
136 Instead, the default implementation is used.
138 * The deprecated <sys/vtimes.h> header and the function vtimes have been
139 removed. To support old binaries, the vtimes function continues to exist
140 as a compatibility symbol. Applications should use the getrlimit or
143 * Following a change in the tzdata 2018a release upstream, the zdump
144 program is now installed in the /usr/bin subdirectory. Previously,
145 the /usr/sbin subdirectory was used.
147 * On s390(x), the type float_t is now derived from the macro
148 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
149 hardcoded to double. This does not affect the ABI of any libraries
150 that are part of the GNU C Library, but may affect the ABI of other
151 libraries that use this type in their interfaces. The new definition
152 improves consistency with compiler behavior in many scenarios.
154 * A future version of glibc will stop loading shared objects from the
155 "tls" subdirectories on the library search path, the subdirectory that
156 corresponds to the AT_PLATFORM system name, and also stop employing
157 the legacy AT_HWCAP search mechanism. Applications should switch to
158 the new glibc-hwcaps mechanism instead; if they do not do that, only
159 the baseline version (directly from the search path directory) will be
162 Changes to build and runtime requirements:
164 * On Linux, the system administrator needs to configure /dev/pts with
165 the intended access modes for pseudo-terminals. glibc no longer
166 attemps to adjust permissions of terminal devices. The previous glibc
167 defaults ("tty" group, user read/write and group write) already
168 corresponded to what most systems used, so that grantpt did not
169 perform any adjustments.
171 * On Linux, the posix_openpt and getpt functions no longer attempt to
172 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
173 (and pseudo-terminals are supported), a devpts file system is mounted
174 on /dev/pts. Current systems already meet these requirements.
176 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
178 Security related changes:
180 CVE-2021-3326: An assertion failure during conversion from the
181 ISO-20220-JP-3 character set using the iconv function has been fixed.
182 This assertion was triggered by certain valid inputs in which the
183 converted output contains a combined sequence of two wide characters
184 crossing a buffer boundary. Reported by Tavis Ormandy.
186 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
187 invoked with input containing redundant shift sequences in the IBM1364,
188 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
190 CVE-2020-29562: An assertion failure has been fixed in the iconv function
191 when invoked with UCS4 input containing an invalid character.
193 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
194 invoked with EUC-KR input containing invalid multibyte input sequences.
196 The following bugs are resolved with this release:
198 [10635] libc: realpath portability patches
199 [16124] dynamic-link: ld.so should allow to change argv[0]
200 [17924] malloc: 'free' should not set errno
201 [18683] libc: Linux faccessat implementation can incorrectly ignore
203 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
204 [23091] hurd: missing waitid support
205 [23249] libc: Epyc and other current AMD CPUs do not select the
206 "haswell" platform subdirectory
207 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
209 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
211 [24941] libc: Make grantpt usable after multi-threaded fork in more
213 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
214 [24973] locale: iconv encounters segmentation fault when converting
215 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
216 [25399] string: undefined reference to `__warn_memset_zero_len' when
217 changing gnuc version
218 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
220 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
222 [25971] libc: s390 bits/hwcap.h out of sync with kernel
223 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
224 [26100] libc: Race in syslog(3) with regards to tag printing.
225 [26124] libc: Export <cpu-features.h>
226 [26130] nscd: Inconsistent nscd cache during pruning
227 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
228 [26224] locale: iconv hangs when converting some invalid inputs from
229 several IBM character sets (CVE-2020-27618)
230 [26341] libc: realpath cyclically call __alloca(path_max) to consume
232 [26343] manual: invalid documented return type for strerrorname_np(),
233 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
234 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
236 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
238 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
239 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
241 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
242 [26553] libc: mtx_init allows type set to "mtx_recursive" only
243 [26555] string: strerrorname_np does not return the documented value
244 [26592] libc: pointer arithmetic overflows in realpath
245 [26600] network: Transaction ID collisions cause slow DNS lookups in
247 [26606] libc: [2.33 Regression] pselect is broken on x32
248 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
249 [26620] glob: fnmatch with collating symbols results in segmentation
251 [26625] libc: [2.33 Regression] CET is disabled
252 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
253 at the end of a memory mapping
254 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
255 by the caller to the kernel
256 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
257 [26647] build: [-Werror=array-parameter=] due to different
258 declarations for __sigsetjmp
259 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
261 [26649] stdio: printf should handle non-normal x86 long double numbers
262 gracefully (CVE-2020-29573)
263 [26686] build: -Warray-parameter instances building with GCC 11
264 [26687] build: -Warray-bounds instances building with GCC 11
265 [26690] stdio: Aliasing violation in __vfscanf_internal
266 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
267 [26726] build: GCC warning calling new_composite_name with an array of
269 [26736] libc: FAIL: misc/tst-sysvshm-linux
270 [26737] libc: Random FAIL: rt/tst-shm
271 [26791] libc: Missing O_CLOEXEC in sysconf.c
272 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
274 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
276 [26818] string: aarch64: string tests may run ifunc variants that are
278 [26821] libc: Memory leak test failures on Fedora 33
279 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
280 FSGSBASE/LM/RDRAND check failure
281 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
283 [26853] libc: aarch64: Missing unwind information in statically linked
285 [26923] locale: Assertion failure in iconv when converting invalid
286 UCS4 (CVE-2020-29562)
287 [26926] dynamic-link: aarch64: library dependencies are not bti
289 [26932] libc: sh: Multiple floating point functions defined as stubs
291 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
293 [26988] dynamic-link: aarch64: BTI mprotect address is not page
295 [27002] build: libc_freeres_fn build failure with GCC 11
296 [27004] dynamic-link: ld.so is miscompiled by GCC 11
297 [27008] dynamic-link: ld.so.cache should have endianness markup
298 [27042] libc: [alpha] anonymous union in struct stat confuses
300 [27053] libc: Conformance regression in system(3) (and probably also
302 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
304 [27077] network: Do not reload /etc/nsswitch.conf from chroot
305 [27083] libc: Unsafe unbounded alloca in addmntent
306 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
308 [27130] string: "rep movsb" performance issue
309 [27150] libc: alpha: wait4() is unavailable in static linking
310 [27177] dynamic-link:
311 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
313 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
314 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
315 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
316 related to combining characters (CVE-2021-3326)
323 * Unicode 13.0.0 Support: Character encoding, character type info, and
324 transliteration tables are all updated to Unicode 13.0.0, using
325 generator scripts contributed by Mike FABIAN (Red Hat).
327 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
329 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
330 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
331 Three ABIs are supported:
337 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
338 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
340 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
341 DT_DEPAUDIT dynamic section entries of the main executable.
343 * powerpc64le supports IEEE128 long double libm/libc redirects when
344 using -mabi=ieeelongdouble to compile C code on supported GCC
345 toolchains. It is recommended to use GCC 8 or newer when testing
348 * To help detect buffer overflows and other out-of-bounds accesses
349 several APIs have been annotated with GCC 'access' attribute. This
350 should help GCC 10 issue better warnings.
352 * On Linux, functions pthread_attr_setsigmask_np and
353 pthread_attr_getsigmask_np have been added. They allow applications
354 to specify the signal mask of a thread created with pthread_create.
356 * The GNU C Library now provides the header file <sys/single_threaded.h>
357 which declares the variable __libc_single_threaded. Applications are
358 encouraged to use this variable for single-thread optimizations,
359 instead of weak references to symbols historically defined in
362 * The functions sigabbrev_np and sigdescr_np have been added. The
363 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
364 SIGHUP) while sigdescr_np returns a string describing the signal number
365 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
366 attempt to translate the return description, both functions return
367 NULL for an invalid signal number.
369 They should be used instead of sys_siglist or sys_sigabbrev and they
370 are both thread and async-signal safe. These functions are GNU extensions.
372 * The functions strerrorname_np and strerrordesc_np have been added. The
373 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
374 while strerrordesc_np returns a string describing the error number
375 (e.g "Invalid argument" for EINVAL). Different than strerror,
376 strerrordesc_np does not attempt to translate the return description, both
377 functions return NULL for an invalid error number.
379 They should be used instead of sys_errlist and sys_nerr, both are
380 thread and async-signal safe. These functions are GNU extensions.
382 * AArch64 now supports standard branch protection security hardening
383 in glibc when it is built with a GCC that is configured with
384 --enable-standard-branch-protection (or if -mbranch-protection=standard
385 flag is passed when building both GCC target libraries and glibc,
386 in either case a custom GCC is needed). This includes branch target
387 identification (BTI) and pointer authentication for return addresses
388 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
389 extensions respectively for the protection to be effective,
390 otherwise the used instructions are nops. User code can use PAC-RET
391 without libc support, but BTI requires a libc that is built with BTI
392 support, otherwise runtime objects linked into user code will not be
395 Deprecated and removed features, and other changes affecting compatibility:
397 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
398 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
399 RPC header files. Backward compatibility for old programs is kept
400 only for architectures and ABIs that have been added in or before
401 glibc 2.31. New programs need to use TI-RPC
402 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
403 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
405 * Remove configure option --enable-obsolete-nsl. libnsl is only built
406 as shared library for backward compatibility and the NSS modules "nis"
407 and "nisplus" are not built at all and libnsl's headers aren't
408 installed. This compatibility is kept only for architectures and ABIs
409 that have been added in or before version 2.28. Replacement
410 implementations based on TI-RPC, which additionally support IPv6, are
411 available from <https://github.com/thkukuk/>. This change does not
412 affect the "compat" NSS module, which does not depend on libnsl
413 since 2.27 and thus can be used without NIS.
415 * The deprecated <sys/sysctl.h> header and the sysctl function have been
416 removed. To support old binaries, the sysctl function continues to
417 exist as a compatibility symbol (on those architectures which had it),
418 but always fails with ENOSYS. This reflects the removal of the system
419 call from all architectures, starting with Linux 5.5.
421 * The sstk function is no longer available to newly linked binaries.
422 Its implementation always returned with a failure, and the function
423 was not declared in any header file.
425 * The legacy signal handling functions siginterrupt, sigpause, sighold,
426 sigrelse, sigignore and sigset, and the sigmask macro have been
427 deprecated. Applications should use the sigsuspend, sigprocmask and
428 sigaction functions instead.
430 * ldconfig now defaults to the new format for ld.so.cache. glibc has
431 already supported this format for almost 20 years.
433 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
434 are no longer available to newly linked binaries, and their declarations
435 have been removed from <string.h>. They are exported solely as
436 compatibility symbols to support old binaries. All programs should use
439 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
440 are no longer available to newly linked binaries, and their declarations
441 have been removed from <stdio.h>. They are exported solely as
442 compatibility symbols to support old binaries. All programs should use
443 strerror or strerror_r instead.
445 * Both strerror and strerror_l now share the same internal buffer in the
446 calling thread, meaning that the returned string pointer may be invalided
447 or contents might be overwritten on subsequent calls in the same thread or
448 if the thread is terminated. It makes strerror MT-safe.
450 * Using weak references to libpthread functions such as pthread_create
451 or pthread_key_create to detect the singled-threaded nature of a
452 program is an obsolescent feature. Future versions of glibc will
453 define pthread_create within libc.so.6 itself, so such checks will
454 always flag the program as multi-threaded. Applications should check
455 the __libc_single_threaded variable declared in
456 <sys/single_threaded.h> instead.
458 * The "files" NSS module no longer supports the "key" database (used for
459 secure RPC). The contents of the /etc/publickey file will be ignored,
460 regardless of the settings in /etc/nsswitch.conf. (This method of
461 storing RPC keys only supported the obsolete and insecure AUTH_DES
462 flavor of secure RPC.)
464 * The __morecore and __after_morecore_hook malloc hooks and the default
465 implementation __default_morecore have been deprecated. Applications
466 should use malloc interposition to change malloc behavior, and mmap to
467 allocate anonymous memory. A future version of glibc may require that
468 applications which use the malloc hooks must preload a special shared
469 object, to enable the hooks.
471 * The hesiod NSS module has been deprecated and will be removed in a
472 future version of glibc. System administrators are encouraged to
473 switch to other approaches for networked account databases, such as
476 Changes to build and runtime requirements:
478 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
479 long double redirects.
481 Security related changes:
483 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
484 invoked with the -c option and when processing invalid multi-byte input
485 sequences. Reported by Jan Engelhardt.
487 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
488 corruption when they were passed a pseudo-zero argument. Reported by Guido
489 Vranken / ForAllSecure Mayhem.
491 CVE-2020-1752: A use-after-free vulnerability in the glob function when
492 expanding ~user has been fixed.
494 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
495 memmove functions has been fixed. Discovered by Jason Royes and Samual
496 Dytrych of the Cisco Security Assessment and Penetration Team (See
499 The following bugs are resolved with this release:
501 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
502 [10441] manual: Backtraces code example lacks error checking
503 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
504 timer_sigev_thread dangerous
505 [14231] stdio: stdio-common tests memory requirements
506 [14578] libc: /proc-based emulation for lchmod, fchmodat
507 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
508 filtee has constructor
509 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
510 sequences (CVE-2016-10228)
511 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
512 character entities for infinity & pi
513 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
514 segfaults in applications
515 [20543] libc: Please move from .gnu.linkonce to comdat
516 [22489] network: gcc warns about implicit convertion in
517 ICMP6_FILTER_SETPASS with -Wsign-conversion
518 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
519 [23294] math: Complex _FloatN functions are redirected to the wrong
520 function with -mlong-double-64
521 [23296] libc: Data race in setting function descriptor during lazy
523 [23668] dynamic-link: ldconfig: Default to the new format for
525 [23819] hurd: hurd: Add C11 thread support
526 [23990] build: test-container error out on failure to exec child.
527 [23991] build: shell-container typo in run_command_array
528 [24638] manual: Error in example of parsing a template string
529 [24654] manual: Wrong declaration of wcschr in libc manual
530 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
532 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
533 dynamically loaded dsos
534 [25098] nptl: nptl: ctype classification functions are not AS-Safe
535 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
537 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
538 restore EAX, ECX and EDX
539 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
540 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
541 [25420] network: Race condition in resolv_conf.c can result in caching
542 stale configuration forever
543 [25487] math: sinl() stack corruption from crafted input
545 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
547 [25523] libc: MIPS/Linux inline syscall template is miscompiled
548 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
550 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
551 on 32 bit and old kernel
552 [25635] libc: arm: Wrong sysdep order selection for soft-fp
553 [25639] localedata: Some names of days and months wrongly spelt in
555 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
556 amount of sigset_t bytes
557 [25691] stdio: printf: memory leak when printing long multibyte
559 [25715] libc: system() returns wrong errors when posix_spawn fails
560 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
561 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
562 state for conversions that produce two Unicode code points
563 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
564 for linux x86_64 leads to livelock
565 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
566 test failures, invalid instruction in ld.so
567 [25790] glob: Typo in tst-fnmatch.input
568 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
570 [25819] localedata: Update locale data to Unicode 13.0.0
571 [25824] libc: Abnormal function of strnlen in aarch64
572 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
573 [25896] libc: Incorrect prctl
574 [25902] libc: Bad LOADARGS_N
575 [25905] dynamic-link: VSX registers are corrupted during PLT
576 resolution when glibc is built with --disable-multi-arch and --with-
578 [25933] string: Off by one error in __strncmp_avx2 when
579 length=VEC_SIZE*4 and strings are at page boundaries can cause a
581 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
582 exiting detached thread
583 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
585 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
587 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
588 [26073] math: getpayload() has wrong return value
589 [26076] dynamic-link: dlmopen crashes after failing to load
590 dependencies in audit mode
591 [26120] localedata: column width of of some Korean
592 JUNGSEONG/JONGSEONG characters wrong (should be 0)
593 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
594 [26133] libc: Incorrect need_arch_feature_F16C
595 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
597 [26149] libc: PKU is usable only if OSPKE is set
598 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
600 [26208] libc: Incorrect bit_cpu_CLFSH
601 [26210] network: Incorrect use of hidden symbols for global sunrpc
603 [26211] stdio: printf integer overflow calculating allocation size
604 [26214] stdio: printf_fp double free
605 [26215] stdio: printf_fp memory leak
606 [26232] time: FAIL: support/tst-timespec for 32-bit targets
607 [26258] nss: nss_compat should not read input files with mmap
608 [26332] string: Incorrect cache line size load causes memory
616 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
617 enable features from the draft ISO C2X standard. Only some features from
618 this draft standard are supported by the GNU C Library, and as the draft
619 is under active development, the set of features enabled by this macro is
620 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
621 by compiling with "gcc -std=gnu2x".
623 * The <math.h> functions that round their results to a narrower type now
624 have corresponding type-generic macros in <tgmath.h>, as defined in TS
625 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
626 Clarification Request 13 to TS 18661-3.
628 * The function pthread_clockjoin_np has been added, enabling join with a
629 terminated thread with a specific clock. It allows waiting against
630 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
632 * New locale added: mnw_MM (Mon language spoken in Myanmar).
634 * The DNS stub resolver will optionally send the AD (authenticated data) bit
635 in queries if the trust-ad option is set via the options directive in
636 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
637 mode, the AD bit, as provided by the name server, is available to
638 applications which call res_search and related functions. In the default
639 mode, the AD bit is not set in queries, and it is automatically cleared in
640 responses, indicating a lack of DNSSEC validation. (Therefore, the name
641 servers and the network path to them are treated as untrusted.)
643 Deprecated and removed features, and other changes affecting compatibility:
645 * The totalorder and totalordermag functions, and the corresponding
646 functions for other floating-point types, now take pointer arguments to
647 avoid signaling NaNs possibly being converted to quiet NaNs in argument
648 passing. This is in accordance with the resolution of Clarification
649 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
650 floating-point arguments directly will continue to work.
652 * The obsolete function stime is no longer available to newly linked
653 binaries, and its declaration has been removed from <time.h>.
654 Programs that set the system time should use clock_settime instead.
656 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
657 in a future version of glibc. In this release, the header still exists
658 but calling ftime will cause a compiler warning. All programs should use
659 gettimeofday or clock_gettime instead.
661 * The gettimeofday function no longer reports information about a
662 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
663 many years, as it cannot handle the full complexity of the world's
664 timezones, but hitherto we have supported it on a best-effort basis.
665 Changes required to support 64-bit time_t on 32-bit architectures have
666 made this no longer practical.
668 As of this release, callers of gettimeofday with a non-null 'tzp' argument
669 should expect to receive a 'struct timezone' whose tz_minuteswest and
670 tz_dsttime fields are zero. (For efficiency reasons, this does not always
671 happen on a few Linux-based ports. This will be corrected in a future
674 All callers should supply a null pointer for the 'tzp' argument to
675 gettimeofday. For accurate information about the time zone associated
676 with the current time, use the localtime function.
678 gettimeofday itself is obsolescent according to POSIX. We have no plans
679 to remove access to this function, but portable programs should consider
680 using clock_gettime instead.
682 * The settimeofday function can still be used to set a system-wide time
683 zone when the operating system supports it. This is because the Linux
684 kernel reused the API, on some architectures, to describe a system-wide
685 time-zone-like offset between the software clock maintained by the kernel,
686 and the "RTC" clock that keeps time when the system is shut down.
688 However, to reduce the odds of this offset being set by accident,
689 settimeofday can no longer be used to set the time and the offset
690 simultaneously. If both of its two arguments are non-null, the call
691 will fail (setting errno to EINVAL).
693 Callers attempting to set this offset should also be prepared for the call
694 to fail and set errno to ENOSYS; this already happens on the Hurd and on
695 some Linux architectures. The Linux kernel maintainers are discussing a
696 more principled replacement for the reused API. After a replacement
697 becomes available, we will change settimeofday to fail with ENOSYS on all
698 platforms when its 'tzp' argument is not a null pointer.
700 settimeofday itself is obsolescent according to POSIX. Programs that set
701 the system time should use clock_settime and/or the adjtime family of
702 functions instead. We may cease to make settimeofday available to newly
703 linked binaries after there is a replacement for Linux's time-zone-like
706 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
707 the optional CAS instruction is implemented (for instance, LEON processors
708 are still supported, but SuperSPARC processors are not).
710 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
713 * If a lazy binding failure happens during dlopen, during the execution of
714 an ELF constructor, the process is now terminated. Previously, the
715 dynamic loader would return NULL from dlopen, with the lazy binding error
716 captured in a dlerror message. In general, this is unsafe because
717 resetting the stack in an arbitrary function call is not possible.
719 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
720 executable stack unless explicitly configured at build time to require
721 minimum kernel version 4.8 or newer. This is because executing
722 floating-point branches on a non-executable stack on Linux kernels prior to
723 4.8 can lead to application crashes for some MIPS configurations. While
724 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
725 expected to enable non-executable stack by default with PT_GNU_STACK by
726 default and is thus likely to trigger a crash on older kernels.
728 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
729 non-executable stack while dropping support for older kernels.
731 * System call wrappers for time system calls now use the new time64 system
732 calls when available. On 32-bit targets, these wrappers attempt to call
733 the new system calls first and fall back to the older 32-bit time system
734 calls if they are not present. This may cause issues in environments
735 that cannot handle unsupported system calls gracefully by returning
736 -ENOSYS. Seccomp sandboxes are affected by this issue.
738 Changes to build and runtime requirements:
740 * It is no longer necessary to have recent Linux kernel headers to build
741 working (non-stub) system call wrappers on all architectures except 64-bit
742 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
744 * The ChangeLog file is no longer present in the toplevel directory of the
745 source tree. ChangeLog files are located in the ChangeLog.old directory as
746 ChangeLog.N where the highest N has the latest entries.
748 Security related changes:
750 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
751 out-of-bounds write when executed in a signal frame context.
753 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
754 environment variable during program execution after a security
755 transition, allowing local attackers to restrict the possible mapping
756 addresses for loaded libraries and thus bypass ASLR for a setuid
757 program. Reported by Marcin Kościelnicki.
759 The following bugs are resolved with this release:
761 [12031] localedata: iconv -t ascii//translit with Greek characters
762 [15813] libc: Multiple issues in __gen_tempname
763 [17726] libc: [arm, sparc] profil_counter should be compat symbol
764 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
765 [19767] libc: vdso is not used with static linking
766 [19903] hurd: Shared mappings not being inherited by children processes
767 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
768 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
770 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
771 Symbols-A/B Unicode blocks
772 [23518] libc: Eliminate __libc_utmp_jump_table
773 [24026] malloc: malloc_info() returns wrong numbers
774 [24054] localedata: Many locales are missing date_fmt
775 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
776 [24304] dynamic-link: Lazy binding failure during ELF
777 constructors/destructors is not fatal
778 [24376] libc: RISC-V symbol size confusion with _start
779 [24682] localedata: zh_CN first weekday should be Monday per GB/T
781 [24824] libc: test-in-container does not install charmap files compatible
783 [24844] regex: regex bad pointer / leakage if malloc fails
784 [24867] malloc: Unintended malloc_info formatting changes
785 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
786 [24880] libc: login: utmp implementation uses struct flock with fcntl64
787 [24882] libc: login: pututline uses potentially outdated cache
788 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
789 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
791 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
793 [24930] dynamic-link: dlopen of PIE executable can result in
794 _dl_allocate_tls_init assertion failure
795 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
796 (stringop-overflow error)
797 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
798 functions other can lead to crashes
799 [24967] libc: jemalloc static linking causes runtime failure
800 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
802 [25035] libc: sbrk() failure handled poorly in tunables_strdup
803 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
804 [25097] libc: new -Warray-bounds with GCC 10
805 [25112] dynamic-link: dlopen must not make new objects accessible when it
806 still can fail with an error
807 [25139] localedata: Please add the new mnw_MM locale
808 [25149] regex: Array bounds violation in proceed_next_node
809 [25157] dynamic-link: Audit cookie for the dynamic loader is not
810 initialized correctly
811 [25189] libc: glibc's __glibc_has_include causes issues with clang
813 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
815 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
816 binaries (CVE-2019-19126)
817 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
819 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
821 [25232] string: <string.h> does not enable const correctness for strchr et
823 [25233] localedata: Consider "." as the thousands separator for sl_SI
825 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
826 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
827 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
829 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
830 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
832 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
833 (dl_initfirst) link map pointer
834 [25401] malloc: pvalloc must not have __attribute_alloc_size__
835 [25423] libc: Array overflow in backtrace on powerpc
836 [25425] network: Missing call to __resolv_context_put in
837 getaddrinfo.c:gethosts
844 * Unicode 12.1.0 Support: Character encoding, character type info, and
845 transliteration tables are all updated to Unicode 12.1.0, using
846 generator scripts contributed by Mike FABIAN (Red Hat).
848 * The dynamic linker accepts the --preload argument to preload shared
849 objects, in addition to the LD_PRELOAD environment variable.
851 * The twalk_r function has been added. It is similar to the existing
852 twalk function, but it passes an additional caller-supplied argument
853 to the callback function.
855 * On Linux, the getdents64, gettid, and tgkill functions have been added.
857 * Minguo (Republic of China) calendar support has been added as an
858 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
861 * The entry for the new Japanese era has been added for ja_JP locale.
863 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
864 pvalloc, memalign, and posix_memalign fail now with total object size
865 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
866 pointer subtraction within the allocated object, where results might
867 overflow the ptrdiff_t type.
869 * The dynamic linker no longer refuses to load objects which reference
870 versioned symbols whose implementation has moved to a different soname
871 since the object has been linked. The old error message, symbol
872 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
873 link time reference, is gone.
875 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
876 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
877 functions. These behave similarly to their "timed" equivalents, but also
878 accept a clockid_t parameter to determine which clock their timeout should
879 be measured against. All functions allow waiting against CLOCK_MONOTONIC
880 and CLOCK_REALTIME. The decision of which clock to be used is made at the
881 time of the wait (unlike with pthread_condattr_setclock, which requires
882 the clock choice at initialization time).
884 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
885 work, new resolvers can use a second argument which can be extended in
886 the future, currently it contains the AT_HWCAP2 value.
888 Deprecated and removed features, and other changes affecting compatibility:
890 * The copy_file_range function fails with ENOSYS if the kernel does not
891 support the system call of the same name. Previously, user space
892 emulation was performed, but its behavior did not match the kernel
893 behavior, which was deemed too confusing. Applications which use the
894 copy_file_range function can no longer rely on glibc to provide a fallback
895 on kernels that do not support the copy_file_range system call, and if
896 this function returns ENOSYS, they will need to use their own fallback.
897 Support for copy_file_range for most architectures was added in version
898 4.5 of the mainline Linux kernel.
900 * The functions clock_gettime, clock_getres, clock_settime,
901 clock_getcpuclockid, clock_nanosleep were removed from the librt library
902 for new applications (on architectures which had them). Instead, the
903 definitions in libc will be used automatically, which have been available
906 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
907 and <sys/stropts.h> have been removed.
909 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
910 resolver flag (deprecated in glibc 2.25) have been removed.
912 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
913 resolver have been removed from <resolv.h>.
915 * With --enable-bind-now, installed programs are now linked with the
918 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
919 configurations) has been removed, following the deprecation of this
920 subarchitecture in version 8 of GCC, and its removal in version 9.
922 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
923 header have been removed.
925 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
926 deprecated and will be removed from a future version of glibc.
927 Application should directly access /proc instead. For obtaining random
928 bits, the getentropy function can be used.
930 Changes to build and runtime requirements:
932 * GCC 6.2 or later is required to build the GNU C Library.
934 Older GCC versions and non-GNU compilers are still supported when
935 compiling programs that use the GNU C Library.
937 Security related changes:
939 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
940 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
941 has undefined behavior. On x32, the size_t argument may be passed
942 in the lower 32 bits of the 64-bit RDX register with non-zero upper
943 32 bits. When it happened with the sign bit of RDX register set,
944 memcmp gave the wrong result since it treated the size argument as
945 zero. Reported by H.J. Lu.
947 CVE-2019-9169: Attempted case-insensitive regular-expression match
948 via proceed_next_node in posix/regexec.c leads to heap-based buffer
949 over-read. Reported by Hongxu Chen.
951 The following bugs are resolved with this release:
953 [2872] locale: Transliteration Cyrillic -> ASCII fails
954 [6399] libc: gettid() should have a wrapper
955 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
956 [16976] glob: fnmatch unbounded stack VLA for collating symbols
957 [17396] localedata: globbing for locale by [[.collating-element.]]
958 [18035] dynamic-link: pldd does no longer work, enters infinite loop
959 [18465] malloc: memusagestat is built using system C library
960 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
961 invalid input drops valid char
962 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
963 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
964 [21897] localedata: Afar locales: Fix mon, abmon, and abday
965 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
966 [23352] malloc: __malloc_check_init still defined in public header
968 [23403] nptl: Wrong alignment of TLS variables
969 [23501] libc: nftw() doesn't return dangling symlink's inode
970 [23733] malloc: Check the count before calling tcache_get()
971 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
973 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
974 [23844] nptl: pthread_rwlock_trywrlock results in hang
975 [23983] argparse: Missing compat versions of argp_failure and argp_error
976 for long double = double
977 [23984] libc: Missing compat versions of err.h and error.h functions for
979 [23996] localedata: Dutch salutations
980 [24040] libc: riscv64: unterminated call chain in __thread_start
981 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
983 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
984 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
986 [24114] regex: regexec buffer read overrun in "grep -i
987 '\(\(\)*.\)*\(\)\(\)\1'"
988 [24122] libc: Segfaults if 0 returned from la_version
989 [24153] stdio: Some input functions do not react to stdin assignment
990 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
991 RDX is set) (CVE-2019-7309)
992 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
993 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
994 not the default "nor"
995 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
996 false positives, change to modern flexible array
997 [24180] nptl: pthread_mutex_trylock does not use the correct order of
998 instructions while maintaining the robust mutex list due to missing
1000 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1001 unnecessary librt dependencies
1002 [24200] localedata: Revert first_weekday removal in en_IE locale
1003 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1004 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1005 [24216] malloc: Check for large bin list corruption when inserting
1007 [24228] stdio: old x86 applications that use legacy libio crash on exit
1008 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1010 [24293] localedata: Missing Minguo calendar support for TW locales
1011 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1012 tt_RU (Tatar) locale
1013 [24307] localedata: Update locale data to Unicode 12.0.0
1014 [24323] dynamic-link: dlopen should not be able open PIE objects
1015 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1016 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1017 tt_RU (Tatar) locale
1018 [24370] localedata: Add lang_name for tt_RU locale
1019 [24372] locale: Binary locale files are not architecture independent
1020 [24394] time: strptime %Ey mis-parses final year of era
1021 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1023 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1025 [24531] malloc: Malloc tunables give tcache assertion failures
1026 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1028 [24535] localedata: Update locale data to Unicode 12.1.0
1029 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1030 kernels and break testing
1031 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1032 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1033 [-Werror=format-overflow=]
1034 [24570] libc: alpha: compat msgctl uses __IPC_64
1035 [24584] locale: Data race in __wcsmbs_clone_conv
1036 [24588] stdio: Remove codecvt vtables from libio
1037 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1039 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1040 [24632] stdio: Old binaries which use freopen with default stdio handles
1042 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1044 [24652] localedata: szl_PL spelling correction
1045 [24695] nss: nss_db: calling getpwent after endpwent crashes
1046 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1047 in /etc/nsswitch.conf
1048 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1049 [24740] libc: getdents64 type confusion
1050 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1051 always implemented in the same library
1052 [24744] libc: Remove copy_file_range emulation
1053 [24757] malloc: memusagestat is linked against system libpthread
1054 [24794] libc: Partial test suite run builds corrupt test-in-container
1062 * The getcpu wrapper function has been added, which returns the currently
1063 used CPU and NUMA node. This function is Linux-specific.
1065 * A new convenience target has been added for distribution maintainers
1066 to build and install all locales as directories with files. The new
1067 target is run by issuing the following command in your build tree:
1068 'make localedata/install-locale-files', with an optional DESTDIR
1069 to set the install root if you wish to install into a non-default
1070 configured location.
1072 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1074 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1075 for _GNU_SOURCE, to match BSD environments.
1077 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1078 indicates that it will abort the transaction prior to entering the kernel
1079 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1080 suspended, and this caused some undefined side-effects issues by aborting
1081 transactions manually. Glibc avoided it by abort transactions manually on
1082 each syscall, but it lead to performance issues on newer kernels where the
1083 HTM state is saved and restore lazily (the state being saved even when the
1084 process actually does not use HTM).
1086 * The functions posix_spawn_file_actions_addchdir_np and
1087 posix_spawn_file_actions_addfchdir_np have been added, enabling
1088 posix_spawn and posix_spawnp to run the new process in a different
1089 directory. These functions are GNU extensions. The function
1090 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1093 * The popen and system do not run atfork handlers anymore (BZ#17490).
1094 Although it is a possible POSIX violation, the POSIX rationale in
1095 pthread_atfork documentation regarding atfork handlers is to handle
1096 inconsistent mutex state after a fork call in a multi-threaded process.
1097 In both popen and system there is no direct access to user-defined mutexes.
1099 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1100 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1102 - C-SKY ABIV2 soft-float little-endian
1103 - C-SKY ABIV2 hard-float little-endian
1105 * strftime's default formatting of a locale's alternative year (%Ey)
1106 has been changed to zero-pad the year to a minimum of two digits,
1107 like "%y". This improves the display of Japanese era years during
1108 the first nine years of a new era, and is expected to be harmless
1109 for all other locales (only Japanese locales regularly have
1110 alternative year numbers less than 10). Zero-padding can be
1111 overridden with the '_' or '-' flags (which are GNU extensions).
1113 * As a GNU extension, the '_' and '-' flags can now be applied to
1114 "%EY" to control how the year number is formatted; they have the
1115 same effect that they would on "%Ey".
1117 Deprecated and removed features, and other changes affecting compatibility:
1119 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1120 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1122 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1123 in <sys/procfs.h>, has been corrected to match the type actually used by
1124 the Linux kernel. This affects the size and layout of that structure on
1125 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1127 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1128 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1129 defined in <sys/procfs.h>, has been corrected to match the type actually
1130 used by the Linux kernel. This affects the size and layout of those
1133 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1134 meant to scan a string and allocate space for it with malloc, is now
1135 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1136 defined. This extension conflicts with C99's use of '%a' to scan a
1137 hexadecimal floating-point number, which is now available to programs
1138 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1140 POSIX.1-2008 includes the feature of allocating a buffer for string input
1141 with malloc, using the modifier letter 'm' instead. Programs using
1142 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1143 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1144 C99 '%a' no longer need to avoid _GNU_SOURCE.
1146 GCC's -Wformat warnings can detect most uses of this extension, as long
1147 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1148 __attribute__ ((format (scanf, ...))).
1150 Changes to build and runtime requirements:
1152 * Python 3.4 or later is required to build the GNU C Library.
1154 * On most architectures, GCC 5 or later is required to build the GNU C
1155 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1157 Older GCC versions and non-GNU compilers are still supported when
1158 compiling programs that use the GNU C Library.
1160 Security related changes:
1162 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1163 denial of service due to resource exhaustion when processing getaddrinfo
1164 calls with crafted host names. Reported by Guido Vranken.
1166 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1167 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1168 happened, accessing the 32-bit size_t value as the full 64-bit register
1169 in the assembly string/memory functions would cause a buffer overflow.
1170 Reported by H.J. Lu.
1172 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1173 addresses with arbitrary trailing characters, potentially leading to data
1174 or command injection issues in applications.
1176 The following bugs are resolved with this release:
1178 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1179 [10496] localedata: 12h time representation in multiple locales faulty
1180 [10797] localedata: it_IT locale numeric does not have a separator for
1182 [11319] libc: dprintf doesn't handle errors properly
1183 [16346] time: mktime: potentially unsafe use of localtime_offset
1184 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1186 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1187 posix_spawn_file_actions_addfchdir_np
1188 [17426] localedata: Indian locales: set the correct date format
1189 [17490] stdio: popen should not invoke atfork handlers
1190 [17783] libc: TIOCSER_TEMT conditions inconsistent
1191 [18040] regex: use-after-free in regexec/get_subexp
1192 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1193 [20018] network: getaddrinfo should reject IP addresses with trailing
1194 characters (CVE-2016-10739)
1195 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1196 [20271] libc: Missing "\n" in __libc_fatal calls
1197 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1198 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1199 pointer argument is non-NULL
1200 [21037] stdio: open_memstream and freopen
1201 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1202 [21716] time: Crash in glibc's mktime in low-memory situations
1203 [22834] stdio: Subprocess forked by popen may crash in Linux when
1204 multithreads call popen
1205 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1206 and pthread_create fails.
1207 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1208 [23125] libc: riscv64: endless loop when throwing an exception from a
1210 [23275] nptl: Race in pthread_mutex_lock while promoting to
1211 PTHREAD_MUTEX_ELISION_NP.
1212 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1214 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1216 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1218 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1219 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1221 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1222 [23521] nss: get_next_alias nss_files file stream leak
1223 [23538] nptl: Hang in pthread_cond_broadcast
1224 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1225 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1226 [23579] libc: Errors misreported in preadv2
1227 [23597] build: support/test-container.c doesn't work with different
1229 [23603] time: mktime signed integer overflow on large timestamps
1230 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1231 [23614] libc: powerpc: missing CFI register information in __mpn_*
1233 [23637] string: Generic strstr/strcasestr fails with huge needles
1234 [23640] libc: no way to easily clear FD_CLOEXEC in
1235 posix_spawn_file_actions_adddup2()
1236 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1238 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1240 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1241 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1242 bits/types/struct_rusage.h
1243 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1245 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1247 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1248 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1249 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1251 [23724] localedata: Albanian date formats are incorrect
1252 [23735] math: libnldbl_nonshared.a references internal libm symbols
1253 [23740] localedata: kl_GL: Month names and date formats need update
1254 [23744] regex: regex refactorings to remove BE, avoid duplication
1255 [23745] time: mktime fix for Gnulib + coreutils
1256 [23758] time: Improve the width of alternate representation for year in
1258 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1259 [23789] time: mktime does not set errno on failure
1260 [23791] localedata: Wrong monetary format for ca_ES locale
1261 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1262 [23794] locale: c16rtomb does not handle surrogate pairs
1263 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1264 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1265 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1266 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1267 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1268 [23862] libc: [sh] missing kernel-features.h undefines
1269 [23864] libc: [riscv] missing kernel-features.h undefines
1270 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1271 [23907] malloc: Incorrect double-free malloc tcache check disregards
1273 [23913] libc: off-by-one in function maybe_script_execute in
1274 sysdeps/posix/spawni.c
1275 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1276 [23923] locale: Add --no-hard-links option to localedef
1277 [23927] network: Linux if_nametoindex() does not close descriptor
1279 [23961] math: powf can overflow to inf without setting errno in non-
1280 nearest rounding mode
1281 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1282 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1283 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1284 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1285 [24011] localedata: Fixed small type in comment for locale bs_BA
1286 [24018] libc: gettext() may return NULL
1287 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1288 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1289 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1291 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1292 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1294 [24046] localedata: en_US locale doesn't define date_fmt
1295 [24063] manual: @var{errno} should be @code{errno}
1296 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1297 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1299 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1301 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1303 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1305 [24112] network: Do not send DNS queries for non-host names (where all
1306 answers will be rejected)
1307 [24130] libc: alpha __remqu corrupts $f3 register
1314 * The localization data for ISO 14651 is updated to match the 2016
1315 Edition 4 release of the standard, this matches data provided by
1316 Unicode 9.0.0. This update introduces significant improvements to the
1317 collation of Unicode characters. This release deviates slightly from
1318 the standard in that the collation element ordering for lowercase and
1319 uppercase LATIN script characters is adjusted to ensure that regular
1320 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1321 is not matched by [a-z]. With the update many locales have been
1322 updated to take advantage of the new collation information. The new
1323 collation information has increased the size of the compiled locale
1324 archive or binary locales.
1326 * The GNU C Library can now be compiled with support for Intel CET, AKA
1327 Intel Control-flow Enforcement Technology. When the library is built
1328 with --enable-cet, the resulting glibc is protected with indirect
1329 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1330 compatible with all existing executables and shared libraries. This
1331 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1332 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1333 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1334 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1335 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1336 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1339 * The GNU C Library now has correct support for ABSOLUTE symbols
1340 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1341 relocated incorrectly or in some cases discarded. The GNU linker can
1342 make use of the newer semantics, but it must communicate it to the
1343 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1344 field) to indicate such support is required.
1346 * Unicode 11.0.0 Support: Character encoding, character type info, and
1347 transliteration tables are all updated to Unicode 11.0.0, using
1348 generator scripts contributed by Mike FABIAN (Red Hat).
1350 * <math.h> functions that round their results to a narrower type are added
1351 from TS 18661-1:2014 and TS 18661-3:2015:
1353 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1354 fMxaddfNx functions.
1356 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1357 fMxsubfNx functions.
1359 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1360 fMxmulfNx functions.
1362 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1363 fMxdivfNx functions.
1365 * Two grammatical forms of month names are now supported for the following
1366 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1367 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1368 support two grammatical forms in abbreviated month names: Catalan, Greek,
1371 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1372 include the support for two grammatical forms of month names.
1374 * Building and running on GNU/Hurd systems now works without out-of-tree
1377 * The renameat2 function has been added, a variant of the renameat function
1378 which has a flags argument. If the flags are zero, the renameat2 function
1379 acts like renameat. If the flag is not zero and there is no kernel
1380 support for renameat2, the function will fail with an errno value of
1381 EINVAL. This is different from the existing gnulib function renameatu,
1382 which performs a plain rename operation in case of a RENAME_NOREPLACE
1383 flags and a non-existing destination (and therefore has a race condition
1384 that can clobber the destination inadvertently).
1386 * The statx function has been added, a variant of the fstatat64
1387 function with an additional flags argument. If there is no direct
1388 kernel support for statx, glibc provides basic stat support based on
1389 the fstatat64 function.
1391 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1392 library if installed. libidn2 version 2.0.5 or later is recommended. If
1393 libidn2 is not available, internationalized domain names are not encoded
1394 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1395 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1396 with an encoding error.) Flags which used to change the IDN encoding and
1397 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1398 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1399 deprecated. They no longer have any effect.
1401 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1402 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1403 range of ELF gABI expressions including such constructs as
1404 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1405 have been further restricted, and where in the past a dynamic string
1406 token sequence may have been interpreted as a literal string it will
1407 now cause a load failure. These load failures were always considered
1408 unspecified behaviour from the perspective of the dynamic loader, and
1409 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1410 results in a load failure now.
1412 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1413 implementation includes all the standard functions provided by
1416 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1417 thrd_detach, thrd_exit, and thrd_join for thread management.
1419 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1420 mtx_destroy for mutual exclusion.
1422 - call_once for function call synchronization.
1424 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1425 cnd_wait for conditional variables.
1427 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1429 Application developers must link against libpthread to use ISO C threads.
1431 Deprecated and removed features, and other changes affecting compatibility:
1433 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1434 installed. Software that was using either header should be updated to
1435 use standard <stdio.h> interfaces instead.
1437 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1438 This was never required by the C standard, and the macros just expanded
1439 to call alternative names for the same functions. If you hoped getc and
1440 putc would provide performance improvements over fgetc and fputc, instead
1441 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1442 necessary, flockfile and funlockfile.
1444 * All stdio functions now treat end-of-file as a sticky condition. If you
1445 read from a file until EOF, and then the file is enlarged by another
1446 process, you must call clearerr or another function with the same effect
1447 (e.g. fseek, rewind) before you can read the additional data. This
1448 corrects a longstanding C99 conformance bug. It is most likely to affect
1449 programs that use stdio to read interactive input from a terminal.
1452 * The macros 'major', 'minor', and 'makedev' are now only available from
1453 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1454 headers that happen to include <sys/types.h>. These macros are rarely
1455 used, not part of POSIX nor XSI, and their names frequently collide with
1456 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1457 further explanation.
1459 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1460 these macros should first include <sys/types.h>, and then include
1461 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1463 * The tilegx*-*-linux-gnu configurations are no longer supported.
1465 * The obsolete function ustat is no longer available to newly linked
1466 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1467 function has been deprecated in favor of fstatfs and statfs.
1469 * The obsolete function nfsservctl is no longer available to newly linked
1470 binaries. This function was specific to systems using the Linux kernel
1471 and could not usefully be used with the GNU C Library on systems with
1472 version 3.1 or later of the Linux kernel.
1474 * The obsolete function name llseek is no longer available to newly linked
1475 binaries. This function was specific to systems using the Linux kernel
1476 and was not declared in a header. Programs should use the lseek64 name
1477 for this function instead.
1479 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1480 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1481 previously selected by them is now always enabled.
1483 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1484 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1485 restriction (rejecting '_' in host names, among other things) has been
1486 removed, for increased compatibility with non-IDN name resolution.
1488 * The fcntl function now have a Long File Support variant named fcntl64. It
1489 is added to fix some Linux Open File Description (OFD) locks usage on non
1490 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1491 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1492 locks act as a cancellation entrypoint.
1494 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1495 ecb_crypt, and des_setparity are no longer available to newly linked
1496 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1497 longer installed. These functions encrypted and decrypted data with the
1498 DES block cipher, which is no longer considered secure. Software that
1499 still uses these functions should switch to a modern cryptography library,
1502 * Reflecting the removal of the encrypt and setkey functions above, the
1503 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1504 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1507 * The obsolete function fcrypt is no longer available to newly linked
1508 binaries. It was just another name for the standard function crypt,
1509 and it has not appeared in any header file in many years.
1511 * We have tentative plans to hand off maintenance of the passphrase-hashing
1512 library, libcrypt, to a separate development project that will, we hope,
1513 keep up better with new passphrase-hashing algorithms. We will continue
1514 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1515 'crypt_r' should not need to change at all; however, distributions will
1516 need to install <crypt.h> and libcrypt from a separate project.
1518 In this release, if the configure option --disable-crypt is used, glibc
1519 will not install <crypt.h> or libcrypt, making room for the separate
1520 project's versions of these files. The plan is to make this the default
1521 behavior in a future release.
1523 Changes to build and runtime requirements:
1525 GNU make 4.0 or later is now required to build glibc.
1527 Security related changes:
1529 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1530 been fixed by removing the glibc-internal IDNA implementation and using
1531 the system-provided libidn2 library instead. Originally reported by Hanno
1532 Böck and Christian Weisgerber.
1534 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1535 architecture could corrupt memory. Reported by Max Horn.
1537 CVE-2018-11236: Very long pathname arguments to realpath function could
1538 result in an integer overflow and buffer overflow. Reported by Alexey
1541 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1542 architecture could write beyond the target buffer, resulting in a buffer
1543 overflow. Reported by Andreas Schwab.
1545 The following bugs are resolved with this release:
1547 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1548 [6889] manual: 'PWD' mentioned but not specified
1549 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1550 when __WORDSIZE != 64
1551 [13762] regex: re_search etc. should return -2 on memory exhaustion
1552 [13888] build: /tmp usage during testing
1553 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1554 [14092] nptl: Support C11 threads
1555 [14095] localedata: Review / update collation data from Unicode / ISO
1557 [14508] libc: -Wformat warnings
1558 [14553] libc: Namespace pollution loff_t in sys/types.h
1559 [14890] libc: Make NT_PRFPREG canonical.
1560 [15105] libc: Extra PLT references with -Os
1561 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1563 [16335] manual: Feature test macro documentation incomplete and out of
1565 [16552] libc: Unify umount implementations in terms of umount2
1566 [17082] libc: htons et al.: statement-expressions prevent use on global
1567 scope with -O1 and higher
1568 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1569 [17438] localedata: pt_BR: wrong d_fmt delimiter
1570 [17662] libc: please implement binding for the new renameat2 syscall
1571 [17721] libc: __restrict defined as /* Ignore */ even in c11
1572 [17979] libc: inconsistency between uchar.h and stdint.h
1573 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1574 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1575 horrible machine code)
1576 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1578 [18471] libc: llseek should be a compat symbol
1579 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1581 [18991] nss: nss_files skips large entry in database
1582 [19239] libc: Including stdlib.h ends up with macros major and minor being
1584 [19463] libc: linknamespace failures when compiled with -Os
1585 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1586 [19527] locale: Normalized charset name not recognized by setlocale
1587 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1588 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1590 [19728] network: out of bounds stack read in libidn function
1591 idna_to_ascii_4i (CVE-2016-6261)
1592 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1593 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1594 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1596 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1597 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1598 [20419] dynamic-link: files with large allocated notes crash in
1600 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1601 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1602 [20980] manual: CFLAGS environment variable replaces vital options
1603 [21163] regex: Assertion failure in pop_fail_stack when executing a
1604 malformed regexp (CVE-2015-8985)
1605 [21234] manual: use of CFLAGS makes glibc detect no optimization
1606 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1607 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1608 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1609 [21508] locale: intl/tst-gettext failure with latest msgfmt
1610 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1611 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1612 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1614 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1616 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1617 [22247] network: Integer overflow in the decode_digit function in
1618 puny_decode.c in libidn (CVE-2017-14062)
1619 [22342] nscd: NSCD not properly caching netgroup
1620 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1621 [22550] localedata: es_ES locale (and other es_* locales): collation
1622 should treat ñ as a primary different character, sync the collation
1623 for Spanish with CLDR
1624 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1625 by gcc configured with --enable-default-pie
1626 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1627 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1628 crossing 2GB threshold (CVE-2017-18269)
1629 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1631 [22735] time: Misleading typo in time.h source comment regarding
1633 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1634 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1635 `__assert_perror_fail ()' to `__assert_fail_base ()'
1636 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1638 [22786] libc: Stack buffer overflow in realpath() if input size is close
1639 to SSIZE_MAX (CVE-2018-11236)
1640 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1641 through an absolute DT_NEEDED path
1642 [22792] build: tcb-offsets.h dependency dropped
1643 [22797] libc: pkey_get() uses non-reserved name of argument
1644 [22807] libc: PTRACE_* constants missing for powerpc
1645 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1646 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1647 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1648 [22848] localedata: ca_ES: update date definitions from CLDR
1649 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1650 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1651 [22896] localedata: Update locale data for an_ES
1652 [22902] math: float128 test failures with GCC 8
1653 [22918] libc: multiple common of `__nss_shadow_database'
1654 [22919] libc: sparc32: backtrace yields infinite backtrace with
1656 [22926] libc: FTBFS on powerpcspe
1657 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1659 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1660 [22947] libc: FAIL: misc/tst-preadvwritev2
1661 [22963] localedata: cs_CZ: Add alternative month names
1662 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1663 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1664 [22998] dynamic-link: execstack tests are disabled when SELinux is
1666 [23005] network: Crash in __res_context_send after memory allocation
1668 [23007] math: strtod cannot handle -nan
1669 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1670 [23036] regex: regex equivalence class regression
1671 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1672 [23069] libc: sigaction broken on riscv64-linux-gnu
1673 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1674 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1675 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1676 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1677 and libc build with -Os)
1678 [23140] localedata: More languages need two forms of month names
1679 [23145] libc: _init/_fini aren't marked as hidden
1680 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1681 [23171] math: C++ iseqsig for long double converts arguments to double
1682 [23178] nscd: sudo will fail when it is run in concurrent with commands
1683 that changes /etc/passwd
1684 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1686 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1687 [23208] localedata: New locale - Lower Sorbian (dsb)
1688 [23233] regex: Memory leak in build_charclass_op function in file
1690 [23236] stdio: Harden function pointers in _IO_str_fields
1691 [23250] nptl: Offset of __private_ss differs from GCC
1692 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1693 -mtune=generic -mfpmath=sse
1694 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1696 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1697 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1699 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1700 [23277] math: nan function should not have const attribute
1701 [23279] math: scanf and strtod wrong for some hex floating-point
1702 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1704 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1705 [23303] build: undefined reference to symbol
1706 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1707 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1709 [23313] stdio: libio vtables validation and standard file object
1711 [23329] libc: The __libc_freeres infrastructure is not properly run across
1713 [23349] libc: Various glibc headers no longer compatible with
1715 [23351] malloc: Remove unused code related to heap dumps and malloc
1717 [23363] stdio: stdio-common/tst-printf.c has non-free license
1718 [23396] regex: Regex equivalence regression in single-byte locales
1719 [23422] localedata: oc_FR: More updates of locale data
1720 [23442] build: New warning with GCC 8
1721 [23448] libc: Out of bounds access in IBM-1390 converter
1722 [23456] libc: Wrong index_cpu_LZCNT
1723 [23458] build: tst-get-cpu-features-static isn't added to tests
1724 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1726 [23467] dynamic-link: x86/CET: A property note parser bug
1733 * The GNU C Library can now be compiled with support for building static
1734 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1735 executables are like static executables but can be loaded at any address
1736 and provide additional security hardening benefits at the cost of some
1737 memory and performance. When the library is built with --enable-static-pie
1738 the resulting libc.a is usable with GCC 8 and above to create static PIE
1739 executables using the GCC option '-static-pie'. This feature is currently
1740 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1741 aarch64 with binutils 2.30 or later.
1743 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1744 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1747 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1749 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1751 * In order to support faster and safer process termination the malloc API
1752 family of functions will no longer print a failure address and stack
1753 backtrace after detecting heap corruption. The goal is to minimize the
1754 amount of work done after corruption is detected and to avoid potential
1755 security issues in continued process execution. Reducing shutdown time
1756 leads to lower overall process restart latency, so there is benefit both
1757 from a security and performance perspective.
1759 * The abort function terminates the process immediately, without flushing
1760 stdio streams. Previous glibc versions used to flush streams, resulting
1761 in deadlocks and further data corruption. This change also affects
1762 process aborts as the result of assertion failures.
1764 * On platforms where long double has the IEEE binary128 format (aarch64,
1765 alpha, mips64, riscv, s390 and sparc), the math library now implements
1766 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1767 These are the same interfaces added in version 2.26 for some platforms where
1768 this format is supported but is not the format of long double.
1770 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1771 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1772 implements interfaces for that type, as defined by ISO/IEC TS
1773 18661-3:2015. These are corresponding interfaces to those supported for
1776 * The math library now implements interfaces for the _Float32, _Float64 and
1777 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1778 corresponding interfaces to those supported for _Float128.
1780 * glibc now implements the memfd_create and mlock2 functions on Linux.
1782 * Support for memory protection keys was added. The <sys/mman.h> header now
1783 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1786 * The copy_file_range function was added.
1788 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1790 * The ldconfig utility now processes `include' directives using the C/POSIX
1791 collation ordering. Previous glibc versions used locale-specific
1792 ordering, the change might break systems that relied on that.
1794 * Support for two grammatical forms of month names has been added.
1795 In a call to strftime, the "%B" and "%b" format specifiers will now
1796 produce the grammatical form required when the month is used as part
1797 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1798 required when the month is named by itself. For instance, in Greek
1799 and in many Slavic and Baltic languages, "%B" will produce the month
1800 in genitive case, and "%OB" will produce the month in nominative case.
1802 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1803 are all valid and will all accept any known form of month
1804 name---standalone or complete, abbreviated or full. In a call to
1805 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1806 the strings used by "%B" and "%b", respectively. New query
1807 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1808 used by "%OB" and "%Ob", respectively.
1810 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1811 define the strings for %OB and %Ob, respectively; these have the
1812 same syntax as "mon" and "abmon". These arrays are optional; if they
1813 are not provided then they have the same content as "mon" and "abmon",
1816 These features are provided for locales which define "alt_mon" and/or
1817 "ab_alt_mon" in their locale source data. This release includes such
1818 alternative month name data for the following languages: Belarusian,
1819 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1821 This feature is currently a GNU extension, but it is expected to
1822 be added to the next revision of POSIX, and it is also already
1823 available on some BSD-derived operating systems.
1825 This feature will cause existing statically compiled applications
1826 to fail to load locales and fall back to the builtin C/POSIX locales.
1827 See notes below for other changes affecting compatibility.
1829 * Support for the RISC-V ISA running on Linux has been added. This port
1830 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1831 for the following ISA and ABI pairs:
1837 Deprecated and removed features, and other changes affecting compatibility:
1839 * Statically compiled applications attempting to load locales compiled for the
1840 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1841 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1842 support for two grammatical forms of the month names, also extends the locale
1843 data binary format. Static applications needing locale support must be
1844 recompiled to match the runtime and data they are deployed with. In some
1845 distributions there is an upgrade window where dynamically linked applications
1846 may use a new library but the old locale data and also fall back to the
1847 builtin C/POSIX locales; restarting the application process is sufficient to
1850 * Support for statically linked applications which call dlopen is deprecated
1851 and will be removed in a future version of glibc. Applications which call
1852 dlopen need to be linked dynamically instead.
1854 * Support for old programs which use internal stdio data structures and
1855 functions is deprecated. This includes programs which use the C++ streams
1856 provided by libstdc++ in GCC 2.95. Programs which use the internal
1857 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1858 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1859 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1860 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1861 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1862 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1863 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1864 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1865 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1866 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1867 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1868 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1869 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1870 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1871 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1872 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1873 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1874 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1875 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1876 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1877 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1878 future version of glibc. Unlike other symbol removals, these old
1879 applications will not be supported using compatibility symbols.
1881 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1882 defined by <sys/ptrace.h>.
1884 * libm no longer supports SVID error handling (calling a user-provided
1885 matherr function on error) or the _LIB_VERSION variable to control error
1886 handling. (SVID error handling and the _LIB_VERSION variable still work
1887 for binaries linked against older versions of the GNU C Library.) The
1888 libieee.a library is no longer provided. math.h no longer defines struct
1889 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1890 TLOSS, PLOSS and HUGE.
1892 * The libm functions pow10, pow10f and pow10l are no longer supported for
1893 new programs. Programs should use the standard names exp10, exp10f and
1894 exp10l for these functions instead.
1896 * The mcontext_t type is no longer the same as struct sigcontext. On
1897 platforms where it was previously the same, this changes the C++ name
1898 mangling for interfaces involving this type.
1900 * The add-ons mechanism for building additional packages at the same time as
1901 glibc has been removed. The --enable-add-ons configure option is now
1904 * The --without-fp configure option is now ignored. Whether hardware
1905 floating-point instructions are used is now configured based on whether
1906 the compiler used at configure time (without any options implied by a
1907 --with-cpu= configure option) uses such instructions.
1909 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1910 the specified string can be parsed as a domain name.
1912 * In the malloc_info output, the <heap> element may contain another <aspace>
1913 element, "subheaps", which contains the number of sub-heaps.
1915 * The libresolv function p_secstodate is no longer supported for new
1918 * The tilepro-*-linux-gnu configuration is no longer supported.
1920 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1921 and will be removed in a future release. Software that is still using
1922 either header should be updated to use standard <stdio.h> interfaces
1925 libio.h was originally the header for a set of supported GNU extensions,
1926 but they have not been maintained as such in many years, they are now
1927 standing in the way of improvements to stdio, and we don't think there are
1928 any remaining external users. _G_config.h was never intended for public
1929 use, but predates the bits convention.
1931 Changes to build and runtime requirements:
1933 * bison version 2.7 or later is required to generate code in the 'intl'
1936 Security related changes:
1938 CVE-2009-5064: The ldd script would sometimes run the program under
1939 examination directly, without preventing code execution through the
1940 dynamic linker. (The glibc project disputes that this is a security
1941 vulnerability; only trusted binaries must be examined using the ldd
1944 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1945 suffered from a one-byte overflow during ~ operator processing (either
1946 on the stack or the heap, depending on the length of the user name).
1947 Reported by Tim Rühsen.
1949 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1950 would sometimes fail to free memory allocated during ~ operator
1951 processing, leading to a memory leak and, potentially, to a denial
1954 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1955 without GLOB_NOESCAPE, could write past the end of a buffer while
1956 unescaping user names. Reported by Tim Rühsen.
1958 CVE-2017-17426: The malloc function, when called with an object size near
1959 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1960 instead of NULL. This was a regression introduced with the new malloc
1961 thread cache in glibc 2.26. Reported by Iain Buclaw.
1963 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1964 to the allocation of too much memory. (This is not a security bug per se,
1965 it is mentioned here only because of the CVE assignment.) Reported by
1968 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1969 of the number of search path components. (This is not a security
1970 vulnerability per se because no trust boundary is crossed if the fix for
1971 CVE-2017-1000366 has been applied, but it is mentioned here only because
1972 of the CVE assignment.) Reported by Qualys.
1974 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1975 for AT_SECURE or SUID binaries could be used to load libraries from the
1978 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1979 succeeds without returning an absolute path due to unexpected behaviour
1980 of the Linux kernel getcwd syscall. Reported by halfdog.
1982 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1983 an object size near the value of SIZE_MAX, would return a pointer to a
1984 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1986 CVE-2018-6551: The malloc function, when called with an object size near
1987 the value of SIZE_MAX, would return a pointer to a buffer which is too
1988 small, instead of NULL.
1990 The following bugs are resolved with this release:
1992 [866] glob: glob should match dangling symlinks
1993 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1994 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1996 [5997] math: Very slow execution of sinf function
1997 [10580] localedata: hr_HR: updated locale
1998 [10871] locale: 'mon' array should contain both nominative and genitive
2000 [12349] localedata: eu_ES: incorrect thousands separator
2001 [13605] localedata: shn_MM: new Shan locale
2002 [13805] localedata: ru_RU: currency should use ',' as radix point
2003 [13953] localedata: km_KH: locale update
2004 [13994] localedata: mjw_IN: new locale
2005 [14121] build: make writes .mo files in po directory
2006 [14333] libc: Fix the race between atexit() and exit()
2007 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2008 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2010 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2011 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2012 width Latin characters
2013 [15332] localedata: es_CU: locale update
2014 [15436] stdio: Don't close or flush stdio streams on abort
2015 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2017 [16148] localedata: ca_ES: incorrect thousands separator
2018 [16750] dynamic-link: ldd should not try to execute the binaries
2020 [16777] localedata: pl_PL: incorrect thousands separator in locale
2021 [16905] localedata: hanzi: new collation
2022 [17563] localedata: cmn_TW: add hanzi collation
2023 [17750] localedata: wrong collation order of diacritics in most locales
2024 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2026 [17956] build: Build fails on missing definitions from header file
2027 nss/nss.h when Mozilla NSS is used for cryptography
2028 [18203] libc: realpath() does not handle unreachable paths correctly
2029 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2030 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2031 [18822] libc: Internal functions are called via PLT
2032 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2033 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2034 [19574] libc: glibc should support building static PIE binaries
2035 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2037 [19971] glob: glob: Do not skip entries with zero d_ino values
2038 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2039 [20008] localedata: km_KH: convert to translit_neutral
2040 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2041 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2042 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2043 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2044 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2046 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2047 they're set, wrong errors returned by gaih_inet when lookup functions
2049 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2050 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2052 [20952] localedata: yuw_PG: new locale
2053 [21084] localedata: charmaps/IBM858: new codepage
2054 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2055 [21242] libc: assert gives pedantic warning in old gcc versions
2056 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2057 __regcall calling convention
2058 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2059 [21326] libc: C99 functions are not declared for C++11 and later if
2060 _GNU_SOURCE is not predefined by g++
2061 [21457] libc: sys/ucontext.h namespace
2062 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2063 [21660] math: GCC fails to compile a formula with tgmath.h
2064 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2065 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2066 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2067 [21684] math: tgmath.h handling of complex integers
2068 [21685] math: tgmath.h handling of bit-fields
2069 [21686] math: tgmath.h handling of __int128
2070 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2072 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2074 [21750] localedata: column width of characters incompatible with classical
2076 [21754] malloc: malloc: Perform as little work as possible after heap
2077 consistency check failures
2078 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2079 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2080 [21791] string: Unused XXX_chk_XXX functions in libc.a
2081 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2083 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2085 [21845] localedata: Added new Locale bho_NP
2086 [21853] localedata: Fix abday Which looks same as day in zh_SG
2087 [21854] localedata: Added New Locale en_SC
2088 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2089 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2090 _dl_runtime_resolve_avx_slow
2091 [21885] network: getaddrinfo: gethosts does not release resolver context
2092 on memory allocation failure
2093 [21899] libc: XPG4.2 sigaction namespace
2094 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2096 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2098 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2099 errno value, causing getaddrinfo to fail
2100 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2101 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2102 instead of EAI_NODATA
2103 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2104 constant PTRACE_SEIZE_DEVEL
2105 [21930] math: C-only gcc builtins used in <math.h> isinf
2106 [21932] network: Unpaired __resolv_context_get in generic get*_r
2108 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2109 [21944] libc: sigval namespace
2110 [21951] localedata: Update hanzi collation by stroke
2111 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2112 sysdeps/x86_64/fpu/e_expf.S
2113 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2114 allocation in syscall loops)
2115 [21959] localedata: Fix Country name for xh_ZA
2116 [21960] localedata: Fix abmon for bem_ZM
2117 [21966] math: AVX2 mathvec functions use FMA without checking
2118 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2119 [21971] localedata: Added New Locale for mfe_MU
2120 [21972] libc: assert macro requires operator== (int) for its argument type
2121 [21973] math: [sparc] libm missing sqrtl compat symbol
2122 [21974] libc: Remove __bb_init_func and __bb_exit_func
2123 [21982] string: stratcliff.c: error: assuming signed overflow does not
2125 [21986] stdio: __guess_grouping is called incorrectly
2126 [21987] math: [sparc32] wrong bits/long-double.h installed
2127 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2129 [22022] localedata: Missing country_name for mni_IN
2130 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2132 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2134 [22026] locale: iconv_open: heap overflow on gconv_init failure
2135 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2136 [22035] math: [m68k] bits/math-inline.h macro namespace
2137 [22038] localedata: Fix abbreviated weeks and months for Somali
2138 [22044] localedata: Remove redundant data for Limburgish Language
2139 [22050] malloc: Linking with -lmcheck does not hook
2140 __malloc_initialize_hook correctly
2141 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2142 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2143 [22070] localedata: charmaps/UTF-8: wcwidth for
2144 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2145 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2146 Jungseong and Jongseong) should be 0
2147 [22078] nss: nss_files performance issue in multi mode
2148 [22082] math: bits/math-finite.h exp10 condition
2149 [22086] libc: pcprofiledump incorrect cross-endian condition
2150 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2151 [22095] network: Name server address allocation memory leak in resolv.conf
2153 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2155 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2156 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2158 [22111] malloc: malloc: per thread cache is not returned when thread exits
2159 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2160 [22134] libc: [linux] implement fexecve with execveat
2161 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2163 [22145] libc: ttyname() gives up too early in the face of namespaces
2164 [22146] math: C++ build issue with float128 on x86_64
2165 [22153] nptl: nptl: save error code before process termination
2166 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2167 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2168 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2169 [22165] libc: [hppa] Text relocations in libc.so
2170 [22180] libc: destructor registered via __cxa_atexit is called twice
2171 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2172 symlinks") cause "make" segfaults
2173 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2175 [22207] libc: FAIL: stdlib/test-atexit-race
2176 [22225] math: nearbyint arithmetic moved before feholdexcept
2177 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2178 [22235] math: iscanonical in C++ and float128
2179 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2180 the svid compat wrapper
2181 [22244] math: ynf and yn are wrong without the svid compat wrapper
2182 [22273] libc: Improper assert in Linux posix_spawn implementation
2183 [22284] libc: -pg -pie doesn't work
2184 [22292] locale: localedef exits with error 4 when it should be error 1
2185 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2186 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2188 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2189 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2191 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2192 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2193 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2194 [22322] libc: [mips64] wrong bits/long-double.h installed
2195 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2196 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2198 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2199 [22343] malloc: Integer overflow in posix_memalign
2200 [22347] libc: getrandom() returns the number of bytes that were copied to
2201 the buffer even though the comments say "Return 0 on success and -1 on
2203 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2204 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2206 [22370] dynamic-link: Incorrect note padding check
2207 [22375] libc: malloc returns pointer from tcache_get when should return
2208 NULL (CVE-2017-17426)
2209 [22377] math: iseqsig, float128 and C++
2210 [22382] localedata: Error in tpi_PG locale
2211 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2212 inside the ASCII printable range
2213 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2215 [22403] localedata: Slash needs escaping in some locales
2216 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2217 [22409] network: res_hnok does not accept some host names used on the
2219 [22412] network: res_dnok, res_hnok should perform syntax checks
2220 [22413] network: ns_name_pton ignores syntactically invalid trailing
2222 [22415] stdio: setvbuf can lead to invalid free/segfault
2223 [22432] build: Non-deterministic build
2224 [22439] malloc: malloc_info should compute summary statistics for all sub-
2226 [22442] network: if_nametoindex could report index for the wrong
2227 networking interface
2228 [22446] build: aliasing violation calling readlink in handle_request
2229 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2230 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2231 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2232 __nscd_hash/__nss_hash
2233 [22463] network: p_secstodate overflow handling
2234 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2235 [22478] libc: sigwait can fail with EINTR
2236 [22505] libc: ldconfig processes include directive in locale-specific
2238 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2239 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2240 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2241 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2242 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2243 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2244 same as for Croatian
2245 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2246 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2247 [22577] libc: missing newline after "cannot allocate TLS data structures
2249 [22588] manual: manual/conf.texi: missing underscore in front of
2251 [22593] math: nextafter and nexttoward are declared with const attribute
2252 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2253 [22603] string: ia64 memchr overflows internal pointer check
2254 [22605] libc: SH clone does not set the exit code correctly
2255 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2257 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2258 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2259 modified in case of success
2260 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2261 [22615] manual: manual: ambiguous wording about errno value in case of
2263 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2265 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2266 binaries or if /proc is not mounted (CVE-2017-16997)
2267 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2268 [22630] build: $(no-pie-ldflag) is no longer effective
2269 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2270 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2271 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2272 [22637] nptl: guard size is subtracted from thread stack size instead of
2274 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2275 [22657] localedata: hu_HU: Avoid double space in date
2276 [22660] math: fmax, fmin sNaN handling on alpha
2277 [22664] libc: New warning of GCC8
2278 [22665] math: alpha: ceil and floor raise inexact exceptions
2279 [22666] math: alpha: trunc raise inexact exceptions
2280 [22667] libc: makecontext lacks stack alignment on i386
2281 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2282 [22679] libc: getcwd(3) can succeed without returning an absolute path
2284 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2285 elision and tunables
2286 [22687] math: [powerpc-nofpu] complex long double functions spurious
2288 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2289 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2290 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2292 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2293 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2295 [22701] nis: Incomplete removal of libnsl
2296 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2297 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2298 [22715] dynamic-link: FAIL: elf/tst-audit10
2299 [22719] libc: Backtrace tests fail on hppa
2300 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2301 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2302 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2303 before the first call to crypt_r () in crypt/badsalttest.c
2310 * A per-thread cache has been added to malloc. Access to the cache requires
2311 no locks and therefore significantly accelerates the fast path to allocate
2312 and free small amounts of memory. Refilling an empty cache requires locking
2313 the underlying arena. Performance measurements show significant gains in a
2314 wide variety of user workloads. Workloads were captured using a special
2315 instrumented malloc and analyzed with a malloc simulator. Contributed by
2316 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2318 * Unicode 10.0.0 Support: Character encoding, character type info, and
2319 transliteration tables are all updated to Unicode 10.0.0, using
2320 generator scripts contributed by Mike FABIAN (Red Hat).
2321 These updates cause user visible changes, especially the changes in
2322 wcwidth for many emoji characters cause problems when emoji sequences
2323 are rendered with pango, see for example:
2324 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2326 * Collation of Hungarian has been overhauled and is now consistent with "The
2327 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2330 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2332 - The GNU C Library will now detect when /etc/resolv.conf has been
2333 modified and reload the changed configuration. The new resolver option
2334 “no-reload” (RES_NORELOAD) disables this behavior.
2336 - The GNU C Library now supports an arbitrary number of search domains
2337 (configured using the “search” directive in /etc/resolv.conf);
2338 previously, there was a hard limit of six domains. For backward
2339 compatibility, applications that directly modify the ‘_res’ global
2340 object are still limited to six search domains.
2342 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2343 Library will now randomly pick a name server from the configuration as a
2344 starting point. (Previously, the second name server was always used.)
2346 * The tunables feature is now enabled by default. This allows users to tweak
2347 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2349 * New function reallocarray, which resizes an allocated block (like realloc)
2350 to the product of two sizes, with a guaranteed clean failure upon integer
2351 overflow in the multiplication. Originally from OpenBSD, contributed by
2352 Dennis Wölfing and Rüdiger Sonderfeld.
2354 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2355 These are extended versions of preadv and pwritev, respectively, taking an
2356 additional flags argument. The set of supported flags depends on the
2357 running kernel; full support currently requires kernel 4.7 or later.
2359 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2360 create a new session ID for the spawned process. This feature is
2361 scheduled to be added to the next major revision of POSIX; for the time
2362 being, it is available under _GNU_SOURCE.
2364 * errno.h is now safe to use from C-preprocessed assembly language on all
2365 supported operating systems. In this context, it will only define the
2366 Exxxx constants, as preprocessor macros expanding to integer literals.
2368 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2369 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2370 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2371 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2373 To compile programs that use this feature, the compiler must support
2374 128-bit floating point with the type name _Float128 (as defined by TS
2375 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2376 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2377 must be defined to make the new interfaces visible.
2379 The new functions and macros correspond to those present for other
2380 floating-point types (except for a few obsolescent interfaces not
2381 supported for the new type), with F128 or f128 suffixes; for example,
2382 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2383 printf or scanf formats for the new type; the strfromf128 and strtof128
2384 interfaces should be used instead.
2386 Deprecated and removed features, and other changes affecting compatibility:
2388 * The synchronization that pthread_spin_unlock performs has been changed to
2389 now be equivalent to a C11 atomic store with release memory order to the
2390 spin lock's memory location. Previously, several (but not all)
2391 architectures used stronger synchronization (e.g., containing what is
2392 often called a full barrier). This change can improve performance, but
2393 may affect odd fringe uses of spin locks that depend on the previous
2394 behavior (e.g., using spin locks as atomic variables to try to implement
2395 Dekker's mutual exclusion algorithm).
2397 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2400 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2401 will only be built and installed when the GNU C Library is configured with
2402 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2403 as TIRPC or rpcsvc-proto, to be used.
2405 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2406 libnss_compat, are deprecated, and will not be built or installed by
2409 The NIS(+) support library, libnsl, is also deprecated. By default, a
2410 compatibility shared library will be built and installed, but not headers
2411 or development libraries. Only a few NIS-related programs require this
2412 library. (In particular, the GNU C Library has never required programs
2413 that use 'gethostbyname' to be linked with libnsl.)
2415 Replacement implementations based on TIRPC, which additionally support
2416 IPv6, are available from <https://github.com/thkukuk/>. The configure
2417 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2418 name service modules, to be built and installed.
2420 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2421 support is enabled, the configured recursive resolver must support EDNS.
2422 (Responding to EDNS-enabled queries with responses which are not
2423 EDNS-enabled is fine, but FORMERR responses are not.)
2425 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2426 servers have not supported this opcode for a long time.
2428 * The _res_opcodes variable has been removed from libresolv. It had been
2429 exported by accident.
2431 * <string.h> no longer includes inline versions of any string functions,
2432 as this kind of optimization is better done by the compiler. The macros
2433 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2435 * The nonstandard header <xlocale.h> has been removed. Most programs should
2436 use <locale.h> instead. If you have a specific need for the definition of
2437 locale_t with no other declarations, please contact
2438 libc-alpha@sourceware.org and explain.
2440 * The obsolete header <sys/ultrasound.h> has been removed.
2442 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2444 * The obsolete function cfree has been removed. Applications should use
2447 * The stack_t type no longer has the name struct sigaltstack. This changes
2448 the C++ name mangling for interfaces involving this type.
2450 * The ucontext_t type no longer has the name struct ucontext. This changes
2451 the C++ name mangling for interfaces involving this type.
2453 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2454 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2455 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2456 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2457 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2458 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2459 fpregset_t type no longer has the name struct fpu. This changes the C++
2460 name mangling for interfaces involving those types.
2462 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2463 synced with the kernel:
2465 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2466 are not supported on this architecture and have been removed.
2468 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2469 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2470 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2472 Programs that assume the GET/SETREGS ptrace requests are universally
2473 available will now fail to build, instead of malfunctioning at runtime.
2475 Changes to build and runtime requirements:
2477 * Linux kernel 3.2 or later is required at runtime, on all architectures
2478 supported by that kernel. (This is a change from version 2.25 only for
2481 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2483 * On most architectures, GCC 4.9 or later is required to build the GNU C
2484 Library. On powerpc64le, GCC 6.2 or later is required.
2486 Older GCC versions and non-GNU compilers are still supported when
2487 compiling programs that use the GNU C Library. (We do not know exactly
2488 how old, and some GNU extensions to C may be _de facto_ required. If you
2489 are interested in helping us make this statement less vague, please
2490 contact libc-alpha@sourceware.org.)
2492 Security related changes:
2494 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2495 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2497 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2498 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2500 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2501 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2504 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2505 fixed (CVE-2017-12133).
2507 The following bugs are resolved with this release:
2509 [984] network: Respond to changed resolv.conf in gethostbyname
2510 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2511 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2513 [12189] libc: __stack_chk_fail should not attempt a backtrace
2515 [14096] time: Race condition on timezone/tst-timezone.out
2516 [14172] localedata: az_IR: new locale
2517 [14995] build: glibc fails to build if gold is the default linker, even if
2519 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2520 [16637] network: inet_pton function is accepting IPv6 with bad format
2521 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2522 x86 and other generic code
2523 [16875] localedata: ko_KR: fix lang_name
2524 [17225] localedata: ar_SY: localized month names for May and June are
2526 [17297] localedata: da_DK: wrong date_fmt string
2527 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2528 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2529 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2530 [19066] localedata: ar_SA abbreviated day and month names are in English
2531 [19569] network: resolv: Support an arbitrary number of search domains
2532 [19570] network: Implement random DNS server selection in the stub
2534 [19838] locale: localedef fails on PA-RISC
2535 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2536 order of 0D36 and 0D37
2537 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2539 [20098] libc: FAIL: debug/backtrace-tst on hppa
2540 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2542 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2544 [20313] localedata: Update locale data to Unicode 9.0
2545 [20424] manual: Document how to provide a malloc replacement
2546 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2548 [20686] locale: Add el_GR@euro to SUPPORTED.
2549 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2550 failures consistently
2551 [21015] dynamic-link: Document and fix --enable-bind-now
2552 [21016] nptl: pthread_cond support is broken on hppa
2553 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2554 frame-pointer on i386
2555 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2557 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2558 [21088] libc: Build fails with --enable-static-nss
2559 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2560 generic c code is used
2561 [21109] libc: Tunables broken on big-endian
2562 [21112] math: powf has large ulp errors with base close to 1 and exponent
2564 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2566 [21120] malloc: glibc malloc is incompatible with GCC 7
2567 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2569 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2570 (-0.0) when linking with -lieee
2571 [21171] math: log10, log2 and lgamma return incorrect results
2572 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2573 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2574 [21207] localedata: ce_RU: update weekdays from CLDR
2575 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2576 [21217] localedata: Update months from CLDR-31
2577 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2578 [21243] libc: support_delete_temp_file should issue warning for failed
2580 [21244] libc: support resolv_test_start() socket fd close should be
2582 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2583 new posix_spawn implementation
2584 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2585 leads to lower CPU frequency
2586 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2587 [21261] libc: [sparc64] bits/setjmp.h namespace
2588 [21267] network: [mips] bits/socket.h IOC* namespace
2589 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2590 [21270] libc: mmap64 silently truncates large offset values
2591 [21275] libc: posix_spawn always crashes on ia64 now
2592 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2593 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2594 [21289] libc: Incorrect declaration for 32-bit platforms with
2595 _FILE_OFFSET_BITS=64 causes build error
2596 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2597 not support gethostbyname4_r
2598 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2600 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2602 [21340] libc: Support POSIX_SPAWN_SETSID
2603 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2604 [21359] network: ns_name_pack needs additional byte in destination buffer
2605 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2606 against fragmentation attacks (CVE-2017-12132)
2607 [21369] network: resolv: Remove EDNS fallback
2608 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2610 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2611 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2612 [21393] stdio: Missing dup3 error check in freopen, freopen64
2613 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2614 [21399] localedata: Bad description for U00EC in
2615 localedata/charmaps/CP1254
2616 [21411] malloc: realloc documentation error
2617 [21426] network: sys/socket.h uio.h namespace
2618 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2619 [21445] libc: signal.h bsd_signal namespace
2620 [21455] network: Network headers stdint.h namespace
2621 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2623 [21475] network: resolv: Overlong search path is truncated mid-label
2624 [21511] libc: sigstack namespace
2625 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2626 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2627 bits/syscall.h: No such file or directory
2628 [21517] libc: struct sigaltstack namespace
2629 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2630 [21533] localedata: Update locale data to Unicode 10.0
2632 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2633 junk at end of line, first unrecognized character is `@'
2634 [21538] libc: SIG_HOLD missing for XPG4
2635 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2636 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2637 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2638 [21543] libc: sigevent namespace
2639 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2640 size for general purpose registers in mcontext_t structure
2641 [21550] libc: sigwait namespace
2642 [21552] libc: XPG4 bsd_signal namespace
2643 [21554] libc: sigpause namespace
2644 [21560] libc: sys/wait.h signal.h namespace
2645 [21561] libc: waitid namespace
2646 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2647 '/usr/include/stdlib.h': Permission denied
2648 [21575] libc: sys/wait.h missing struct rusage definition
2649 [21584] libc: sigaltstack etc namespace
2650 [21597] libc: siginterrupt namespace
2651 [21607] math: hppa: FAIL: math/test-tgmath
2652 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2654 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2655 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2656 stack and heap (CVE-2017-1000366)
2657 [21625] libc: wait3 namespace
2658 [21654] nss: Incorrect pointer alignment in NSS group merge result
2660 [21657] network: Parse interface zone id for node-local multicast
2661 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2663 [21666] libc: .symver is used on common symbol
2664 [21668] network: resolv: res_init cross-thread broadcast introduces race
2666 [21687] math: tgmath.h totalorder, totalordermag return type
2667 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2669 [21696] libc: Incorrect assumption of of __cpu_mask in
2670 posix/sched_cpucount.c
2671 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2672 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2674 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2675 leading to relocation crash
2676 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2677 `resolv_conf_matches (resp, conf)' failed.
2678 [21710] localedata: Added Samoan language locale for Samoa
2679 [21711] localedata: Pashto yesstr/nostr locale are missing
2680 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2681 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2682 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2683 [21723] localedata: yesstr/nostr missing for Chinese language locale
2684 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2686 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2688 [21728] localedata: New Locale for Tongan language
2689 [21729] localedata: incorrect LC_NAME fields for hi_IN
2690 [21733] localedata: yesstr and nostr are missing for zh_HK
2691 [21734] localedata: Missing yesstr and nostr are for kw_GB
2692 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2693 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2694 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2695 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2697 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2699 [21749] localedata: Wrong abbreviated day name (“abday”) for
2701 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2702 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2703 [21759] localedata: missing yesstr and nostr for Tigrinya
2704 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2705 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2706 [21767] localedata: Missing Bislama locales
2707 [21768] localedata: Missing yesstr and nostr for aa_ET
2708 [21770] localedata: Missing Field in li_NL
2709 [21778] nptl: Robust mutex may deadlock
2710 [21779] libc: MicroBlaze segfaults when loading libpthread
2711 [21783] localedata: Fix int_select international_call_prefixes
2712 [21784] localedata: Inconsistency in country_isbn
2713 [21788] localedata: Missing Country Postal Abbreviations
2714 [21794] localedata: Added-country_isbn-for-Italy
2715 [21795] localedata: Add/Fix country_isbn for France
2716 [21796] localedata: Added country_isbn for Republic of Korea
2717 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2718 [21799] localedata: Added int_select international_call_prefixes
2719 [21801] localedata: Added int_select international_call_prefixes
2720 [21804] nptl: Double semicolon in thread-shared-types.h
2721 [21807] localedata: LC_ADDRESS fix for pap_CW
2722 [21808] localedata: Fix LC_ADDRESS for pap_AW
2723 [21821] localedata: Added country_name in mai_IN
2724 [21822] localedata: Fix LC_TIME for mai_IN
2725 [21823] localedata: missing yesstr, nostr for sa_IN
2726 [21825] localedata: Fix name_mrs for mag_IN
2727 [21828] localedata: 2.26 changelog should mention user visible changes
2729 [21835] localedata: Added Maithili language locale for Nepal
2730 [21838] localedata: Removed redundant data for the_NP
2731 [21839] localedata: Fix LC_MONETARY for ta_LK
2732 [21844] localedata: Fix Latin characters and Months Sequence.
2733 [21848] localedata: Fix mai_NP Title Name
2738 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2739 24731-2:2010, is supported to enable declarations of functions from that
2740 TR. Note that not all functions from that TR are supported by the GNU C
2743 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2744 18661-1:2014, is supported to enable declarations of functions and macros
2745 from that TS. Note that not all features from that TS are supported by
2748 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2749 18661-4:2015, is supported to enable declarations of functions and macros
2750 from that TS. Note that most features from that TS are not supported by
2753 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2754 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2755 Since the GNU C Library defaults to a much newer revision of POSIX, this
2756 will only affect programs that specifically request an old conformance
2757 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2758 see a change in the visible declarations, but a program compiled with
2759 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2762 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2763 defined by all multithreaded code, but glibc has not required this for
2766 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2767 means that in a future release, the macros “major”, “minor”, and “makedev”
2768 will only be available from <sys/sysmacros.h>.
2770 These macros are not part of POSIX nor XSI, and their names frequently
2771 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2772 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2773 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2776 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2777 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2778 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2780 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2781 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2782 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2783 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2784 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2785 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2786 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2787 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2788 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2789 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2790 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2793 * New <math.h> features are added from TS 18661-1:2014:
2795 - Signaling NaN macros: SNANF, SNAN, SNANL.
2797 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2798 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2799 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2801 - llogb functions: the llogb, llogbf and llogbl functions, and the
2802 FP_LLOGB0 and FP_LLOGBNAN macros.
2804 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2807 - Comparison macros: iseqsig.
2809 - Classification macros: iscanonical, issubnormal, iszero.
2811 - Total order functions: totalorder, totalorderf, totalorderl,
2812 totalordermag, totalordermagf, totalordermagl.
2814 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2816 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2817 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2819 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2820 are added to libc. They convert a floating-point number into string.
2822 * Most of glibc can now be built with the stack smashing protector enabled.
2823 It is recommended to build glibc with --enable-stack-protector=strong.
2824 Implemented by Nick Alcock (Oracle).
2826 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2827 intended to be used instead of memset() to erase sensitive data after use;
2828 the compiler will not optimize out calls to explicit_bzero even if they
2829 are "unnecessary" (in the sense that no _correct_ program can observe the
2830 effects of the memory clear).
2832 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2833 to float instead of double. This does not affect the ABI of any libraries
2834 that are part of the GNU C Library, but may affect the ABI of other
2835 libraries that use this type in their interfaces.
2837 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2838 float_t and double_t types are now defined to long double instead of float
2839 and double. These options are not the default, and this does not affect
2840 the ABI of any libraries that are part of the GNU C Library, but it may
2841 affect the ABI of other libraries that use this type in their interfaces,
2842 if they are compiled or used with those options.
2844 * The getentropy and getrandom functions, and the <sys/random.h> header file
2847 * The buffer size for byte-oriented stdio streams is now limited to 8192
2848 bytes by default. Previously, on Linux, the default buffer size on most
2849 file systems was 4096 bytes (and thus remains unchanged), except on
2850 network file systems, where the buffer size was unpredictable and could be
2851 as large as several megabytes.
2853 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2854 for the Linux quota interface which predates kernel version 2.4.22 has
2857 * The malloc_get_state and malloc_set_state functions have been removed.
2858 Already-existing binaries that dynamically link to these functions will
2859 get a hidden implementation in which malloc_get_state is a stub. As far
2860 as we know, these functions are used only by GNU Emacs and this change
2861 will not adversely affect already-built Emacs executables. Any undumped
2862 Emacs executables, which normally exist only during an Emacs build, should
2863 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2865 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2866 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2867 “no-ip6-dotint” had already been the default, and support for the
2868 “ip6-dotint” option was removed from the Internet in 2006.
2870 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2871 flag from <resolv.h> have been removed. The option relied on a
2872 backwards-incompatible DNS extension which was never deployed on the
2875 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2876 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2877 They were already unimplemented.
2879 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2880 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2881 removed again from the IETF name lookup interface specification in RFC
2882 2553. Applications should use getaddrinfo instead.
2884 * DNSSEC-related declarations and definitions have been removed from the
2885 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2886 decode the data part of DNSSEC record types. Previous versions of glibc
2887 only implemented minimal support for the previous version of DNSSEC, which
2888 is incompatible with the currently deployed version.
2890 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2891 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2892 <arpa/nameser.h> header file because the distinction between RR types and
2893 meta-RR types is not officially standardized, subject to revision, and
2894 thus not suitable for encoding in a macro.
2896 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2897 and rhook members of the res_state type in <resolv.h> have been removed.
2898 The glibc stub resolver did not support these hooks, but the header file
2899 did not reflect that.
2901 * For multi-arch support it is recommended to use a GCC which has
2902 been built with support for GNU indirect functions. This ensures
2903 that correct debugging information is generated for functions
2904 selected by IFUNC resolvers. This support can either be enabled by
2905 configuring GCC with '--enable-gnu-indirect-function', or by
2906 enabling it by default by setting 'default_gnu_indirect_function'
2907 variable for a particular architecture in the GCC source file
2910 * GDB pretty printers have been added for mutex and condition variable
2911 structures in POSIX Threads. When installed and loaded in gdb these pretty
2912 printers show various pthread variables in human-readable form when read
2913 using the 'print' or 'display' commands in gdb.
2915 * Tunables feature added to allow tweaking of the runtime for an application
2916 program. This feature can be enabled with the '--enable-tunables' configure
2917 flag. The GNU C Library manual has details on usage and README.tunables has
2918 instructions on adding new tunables to the library.
2920 * A new version of condition variables functions have been implemented in
2921 the NPTL implementation of POSIX Threads to provide stronger ordering
2924 * A new version of pthread_rwlock functions have been implemented to use a more
2925 scalable algorithm primarily through not using a critical section anymore to
2928 Security related changes:
2930 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2931 have been created with makecontext could fail to terminate due to a
2932 missing .cantunwind annotation. This has been observed to lead to a hang
2933 (denial of service) in some Go applications compiled with gccgo. Reported
2934 by Andreas Schwab. (CVE-2016-6323)
2936 * The DNS stub resolver functions would crash due to a NULL pointer
2937 dereference when processing a query with a valid DNS question type which
2938 was used internally in the implementation. The stub resolver now uses a
2939 question type which is outside the range of valid question type values.
2942 The following bugs are resolved with this release:
2944 [4099] stdio: Overly aggressive caching by stream i/o functions.
2945 [7065] build: Support building glibc with -fstack-protector or -fstack-
2947 [9842] localedata: en_CA: incorrect date format
2948 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2949 before it started waiting
2950 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2951 [15765] nptl: sem_open is wrongly a cancellation point
2952 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2953 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2955 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2956 library linked with pthread
2957 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2958 "FIXME: Ingo" issue)
2959 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2960 [17252] libc: getrandom and getentropy syscall
2961 [17730] malloc: thread-local storage is sometimes improperly free()'d
2962 after being __libc_memalign()'d
2963 [18241] stdio: failed fseek on memstream does not set errno and can fail
2965 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2967 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2968 PTHREAD_PRIO_INHERIT mutex on ARM
2969 [18784] network: res_query and related function crash for special record
2970 type queries (CVE-2015-5180)
2971 [19380] math: strtod does not raise "inexact"
2972 [19387] string: Integer overflow in memchr
2973 [19390] string: Integer overflow in strncat
2974 [19398] build: linknamespace tests fail with massively parallel build
2975 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2977 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2978 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2979 [19514] libc: [PATCH] Fix spelling errors in spelling
2980 "implement"/"implementation" in several places
2981 [19582] network: Deprecate RES_USE_INET6
2982 [19673] manual: clog10 docs appear to be erroneous
2983 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2984 causes a segmentation fault
2985 [19826] libc: invalid pointer returned from __tls_get_addr with static
2987 [20016] network: resolv: Remove hooks support from the API
2988 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2990 [20033] math: [x86_64] vectorized math function don't call the __finite
2992 [20116] nptl: use after free in pthread_create
2993 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2994 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2996 [20311] nptl: please install proc_service.h
2997 [20366] libc: Compilation errors in installed headers in strict-compliance
2999 [20370] malloc: malloc: Arena free list management is still racy
3000 (incorrect fix in bug 19243)
3001 [20386] libc: assert (X = 0) does not result in GCC warning
3002 [20432] malloc: malloc: Minimize interface required for interposition
3003 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3004 in _Unwind_Backtrace (CVE-2016-6323)
3005 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3006 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3008 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3009 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3010 [20477] network: resolv: incorrect double-checked locking related to
3012 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3014 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3016 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3017 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3018 cause transition penalty
3019 [20517] math: sparcv9 missing fdiml compat symbol
3020 [20524] manual: strverscmp is inconsistent
3021 [20525] libc: <sys/quota.h> should be based on kernel headers
3022 [20539] math: GCC 7 -static -lm fails to link at -O3
3023 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3025 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3027 [20591] network: Remove obsolete DNSSEC support
3028 [20592] network: DNS resource record type classification macros in
3029 <arpa/nameser.h> are incorrect
3030 [20593] network: Update DNS RR type definitions
3031 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3032 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3034 [20629] network: libresolv: Remove support for bitstring labels
3036 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3037 assertion: "maxidx >= 2"
3038 [20660] math: [arm] Use VSQRT
3039 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3040 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3041 [20689] libc: Test for FMA should also check for AVX.
3042 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3043 [20715] math: iszero macro breaks existing code
3044 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3045 [20728] libc: powerpc: Missing TOC stub in clone
3046 [20729] build: glibc-2.24 fails to build for i486 with -Os
3047 [20750] build: Build fails with default PIE enabled gcc-6.x
3048 [20768] math: [alpha] sqrt fegetenv namespace
3049 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3051 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3052 __FLT_EVAL_METHOD__ is 2
3053 [20790] network: rpcgen buffer overrun in get_prog_declaration
3054 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3055 [20829] libc: crypt snprintf namespace
3056 [20847] libc: tst-vfork3 failure
3057 [20855] math: Default bits/mathdef.h has inappropriate float_t
3058 [20859] math: [sh4] FP_ILOGB0 invalid
3059 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3060 U+20AC), not same as GBK
3061 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3062 [20916] math: pow handling of sNaN arguments
3063 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3064 [20919] math: Bad pow (qNaN, 0) result with -lieee
3065 [20940] math: hypot sNaN handling
3066 [20947] math: fmax, fmin sNaN handling
3067 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3068 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3070 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3071 [20973] nptl: robust mutexes: Lost wake-ups
3072 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3073 [20978] nis: strlen on null pointer in nss_nisplus
3074 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3076 [21014] string: i686 memchr overflows internal pointer check
3077 [21019] libc: [mips] n32 lseek incorrect on overflow
3078 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3079 [21026] libc: [MIPS] readahead syscall is broken on n64
3080 [21028] math: Fallback fesetexceptflag should always succeed
3081 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3082 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3084 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3085 [21061] librt: [microblaze] librt lost clock_* exports
3086 [21073] libc: tunables: insecure environment variables passed to
3087 subprocesses with AT_SECURE
3088 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3092 * The minimum Linux kernel version that this version of the GNU C Library
3093 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3094 kernel version 2.6.32 or later suffices (on architectures that already
3095 required kernel versions more recent than 3.2, those requirements remain
3096 unchanged). Linux 3.2 or later kernel headers are required on all
3099 * The pap_AN locale has been deleted. This has been deprecated for a long
3100 time. It has been replaced by pap_AW & pap_CW, both of which have long
3101 been included in previous releases.
3103 * The readdir_r and readdir64_r functions have been deprecated. It is
3104 recommended to use readdir and readdir64 instead.
3106 * The type “union wait” has been removed. It was deprecated in the early
3107 1990s and never part of POSIX. Application code should use the int type
3108 instead of “union wait”.
3110 * A new NSS action is added to facilitate large distributed system
3111 administration. The action, MERGE, allows remote user stores like LDAP
3112 to be merged into local user stores like /etc/groups in order to provide
3113 easy to use, updated, and managed sets of merged credentials. The new
3114 action can be used by configuring it in /etc/nsswitch.conf:
3115 group: files [SUCCESS=merge] nis
3116 Implemented by Stephen Gallagher (Red Hat).
3118 * The deprecated __malloc_initialize_hook variable has been removed from the
3121 * The long unused localedef --old-style option has been removed. It hasn't
3122 done anything in over 16 years. Scripts using this option can safely
3125 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3126 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3127 return the next representable value in the direction of positive infinity
3128 and the nextdown functions return the next representable value in the
3129 direction of negative infinity. These are currently enabled as GNU
3132 Security related changes:
3134 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3135 could result in a stack overflow when getnetbyname was called with an
3136 overly long name. (CVE-2016-3075)
3138 * Previously, getaddrinfo copied large amounts of address data to the stack,
3139 even after the fix for CVE-2013-4458 has been applied, potentially
3140 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3141 instead. Reported by Michael Petlan. (CVE-2016-3706)
3143 * The glob function suffered from a stack-based buffer overflow when it was
3144 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3145 Reported by Alexander Cherepanov. (CVE-2016-1234)
3147 * The Sun RPC UDP client could exhaust all available stack space when
3148 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3149 alloca plugin for GCC. (CVE-2016-4429)
3151 * The IPv6 name server management code in libresolv could result in a memory
3152 leak for each thread which is created, performs a failing naming lookup,
3153 and exits. Over time, this could result in a denial of service due to
3154 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3156 The following bugs are resolved with this release:
3158 [1170] localedata: ne_NP: update Nepali locale definition file
3159 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3161 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3162 [6796] math: fdim() does not set errno on overflow
3163 [10354] libc: posix_spawn should use vfork() in more cases than presently
3164 [11213] localedata: localedata: add copyright disclaimer to locale files
3165 [12143] localedata: chr_US: new Cherokee locale
3166 [12450] localedata: sgs_LT: new locale
3167 [12676] localedata: ln_CD: new locale
3168 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3170 [13304] math: fma, fmaf, fmal produce wrong results
3171 [14259] build: --localedir arg to configure is ignored
3172 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3173 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3174 [14934] localedata: es_CL: wrong first weekday chilean locale
3175 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3177 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3179 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3180 [15368] nptl: raise() is not async-signal-safe
3181 [15479] math: ceil, floor, round and trunc raise inexact exception
3182 [15578] localedata: kk_KZ: various updates
3183 [16003] localedata: pap_AN: punt old locale
3184 [16137] localedata: iw_IL: punt old locale
3185 [16190] localedata: eo: new esperanto locale
3186 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3187 [16742] malloc: race condition: pthread_atfork() called before first
3188 malloc() results in unexpected locking behaviour/deadlocks
3189 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3191 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3192 [17565] localedata: pt_PT: wrong (work-)week start
3193 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3194 [17950] build: Build fails with -msse
3195 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3196 [18433] libc: posix_spawn does not return correctly upon failure to
3198 [18453] localedata: charmaps/IBM875: incorrect codes
3199 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3201 [18896] localedata: he_IL: improvements for currency
3202 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3203 Romanian locale data
3204 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3206 [19056] libc: Deprecate readdir_r
3207 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3209 [19198] localedata: nl_NL: small improvements for Dutch locales
3210 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3211 nameservers (CVE-2016-5417)
3212 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3214 [19400] locale: Language missing in "iso-639.def", trivial fix in
3216 [19431] malloc: Deadlock between fflush, getdelim, and fork
3217 [19505] libc: Incorrect file descriptor validity checks in
3218 posix_spawn_file_actions_add{open,close,dup2}
3219 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3220 when using RTLD_NEXT
3221 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3222 `intl/{gettextP,loadinfo}.h'
3223 [19534] libc: execle, execlp may use malloc
3224 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3225 [19573] network: res_nclose and __res_maybe_init disagree about name
3226 server initialization, breaking Hesiod
3227 [19575] localedata: Status of GB18030 tables
3228 [19581] localedata: sr_* date_fmt string contains additional newline
3229 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3231 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3232 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3233 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3234 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3236 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3238 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3240 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3241 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3242 [19633] locale: strfmon_l applies global locale to number formatting
3243 [19642] network: Memory leak in getnameinfo
3244 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3245 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3247 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3248 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3250 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3251 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3253 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3255 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3257 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3258 pointers and lengths in error-case.
3259 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3260 report errors on UTF-16 surrogates values.
3261 [19755] nscd: nscd assertion failure in gc
3262 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3263 [19759] libc: mempcpy shouldn't be inlined
3264 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3265 [19765] libc: s390 needs an optimized mempcpy
3266 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3267 NAME_MAX limit assumption (CVE-2016-1234)
3268 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3269 [19787] network: Missing and incorrect truncation checks in getnameinfo
3270 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3272 [19791] network: Assertion failure in res_query.c with un-connectable name
3274 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3275 [19822] math: libm.so install clobbers old version
3276 [19825] network: resolv: send_vc can return uninitialized data in second
3277 response to getaddrinfo
3278 [19830] network: nss_dns: should check RDATA length against buffer length
3279 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3280 confronted with A/AAAA records of invalid size
3281 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3282 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3283 [19853] stdio: Printing IBM long double in decimal with high precision is
3285 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3286 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3287 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3289 [19865] network: Assertion failure or memory leak in
3290 _nss_dns_getcanonname_r
3291 [19868] network: nss_dns: netent code does not skip over non-PTR records
3292 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3294 [19881] string: Improve x86-64 memset
3295 [19907] string: Incorrect memcpy tests
3296 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3298 [19925] libc: termios.h XCASE namespace
3299 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3300 [19929] libc: limits.h NL_NMAX namespace
3301 [19931] stdio: Memory leak in vfprintf
3302 [19957] libc: clone(CLONE_VM) access invalid parent memory
3303 [19963] localedata: en_IL: New locale
3304 [19989] stdio: stdio.h cuserid namespace
3305 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3307 [19996] locale: langinfo.h nl_langinfo_l namespace
3308 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3309 [20010] network: getaddrinfo: Stack overflow in hostent translation
3311 [20012] stdio: libio: fmemopen append mode failure
3312 [20014] stdio: stdio.h namespace for pre-threads POSIX
3313 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3314 [20023] libc: fcntl.h timespec namespace
3315 [20024] math: [x86_64] vectorized sincos trashes the stack
3316 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3317 [20041] time: sys/time.h timespec namespace
3318 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3319 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3320 [20051] libc: ttyslot in wrong header under wrong conditions
3321 [20054] libc: gethostname not declared for XPG4
3322 [20055] libc: termios.h missing tcgetsid for XPG4
3323 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3325 [20073] libc: sys/stat.h fchmod namespace
3326 [20074] libc: stdlib.h rand_r namespace
3327 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3328 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3330 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3331 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3333 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3334 [20119] libc: Wrong mask for processors level type from CPUID
3335 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3336 AS not supporting AVX512
3337 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3339 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3340 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3342 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3343 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3344 [20178] libc: posix_spawn{p} should not call exit
3345 [20191] stdio: libio: vtables hardening
3346 [20195] string: FMA4 detection requires CPUID execution with register
3348 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3349 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3351 [20212] math: acos (sNaN) returns sNaN
3352 [20213] math: asin (sNaN) returns sNaN
3353 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3354 [20218] math: [i386] asinhl (sNaN) returns sNaN
3355 [20219] math: [i386] atanhl (sNaN) returns sNaN
3356 [20222] stdio: fopencookie: Mangle function pointers
3357 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3358 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3359 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3361 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3362 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3363 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3364 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3365 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3366 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3367 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3368 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3369 [20240] math: modf (sNaN) returns sNaN
3370 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3371 [20250] math: frexp (sNaN) returns sNaN
3372 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3373 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3375 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3376 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3377 subscript is below array bounds [-Werror=array-bounds]
3378 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3379 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3381 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3382 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3384 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3385 "invalid" exceptions
3386 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3387 [20316] localedata: id_ID: Februari instead of Pebruari
3388 [20327] string: POWER8 strcasecmp returns incorrect result
3389 [20347] math: Failure: Test: j0_downward (0xap+0)
3390 [20348] libc: FAIL: misc/tst-preadvwritev64
3391 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3392 [20350] libc: There is no test for p{read,write}64
3393 [20357] math: Incorrect cos result for 1.5174239687223976
3394 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3398 * Unicode 8.0.0 Support: Character encoding, character type info, and
3399 transliteration tables are all updated to Unicode 8.0.0, using new
3400 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3401 These updates cause user visible changes, such as the fixes for bugs
3402 89, 16061, and 18568.
3404 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3405 kernel-internal CPU set size. This means that requests that change the
3406 CPU affinity which failed before (for example, an all-ones CPU mask) will
3407 now succeed. Applications that need to determine the effective CPU
3408 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3409 setting it because the kernel can adjust it (and the previous size check
3410 would not detect this in the majority of cases).
3412 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3413 the following new symbols are used: fts64_children, fts64_close,
3414 fts64_open, fts64_read and fts64_set.
3416 * getaddrinfo now detects certain invalid responses on an internal netlink
3417 socket. If such responses are received, an affected process will
3418 terminate with an error message of "Unexpected error <number> on netlink
3419 descriptor <number>" or "Unexpected netlink response of size <number> on
3420 descriptor <number>". The most likely cause for these errors is a
3421 multi-threaded application which erroneously closes and reuses the netlink
3422 file descriptor while it is used by getaddrinfo.
3424 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3425 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3426 unnecessary serialization of memory allocation requests across threads.
3427 The defect is now corrected. Users should see a substantial increase in
3428 the concurent throughput of allocation requests for applications which
3429 trigger this bug. Affected applications typically create and
3430 destroy threads frequently. (Bug 19048 was reported and analyzed by
3433 * There is now a --disable-timezone-tools configure option for disabling the
3434 building and installing of the timezone related utilities (zic, zdump, and
3435 tzselect). This is useful for people who build the timezone data and code
3436 independent of the GNU C Library.
3438 * The obsolete header <regexp.h> has been removed. Programs that require
3439 this header must be updated to use <regex.h> instead.
3441 * The obsolete functions bdflush, create_module, get_kernel_syms,
3442 query_module and uselib are no longer available to newly linked binaries;
3443 the header <sys/kdaemon.h> has been removed. These functions and header
3444 were specific to systems using the Linux kernel and could not usefully be
3445 used with the GNU C Library on systems with version 2.6 or later of the
3448 * Optimized string, wcsmbs and memory functions for IBM z13.
3449 Implemented by Stefan Liebler.
3451 * Newly linked programs that define a variable called signgam will no longer
3452 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3453 require signgam to be set by those functions must ensure that they use the
3454 variable provided by the GNU C Library and declared in <math.h>, without
3455 defining their own copy.
3457 * The minimum GCC version that can be used to build this version of the GNU
3458 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3459 still be used to compile programs using the GNU C Library.
3461 Security related changes:
3463 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3464 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3466 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3467 the pointer guard feature. It is always enabled. Previously,
3468 LD_POINTER_GUARD could be used to disable security hardening in binaries
3469 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3472 * An integer overflow in hcreate and hcreate_r could lead to an
3473 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3475 * The catopen function no longer has unbounded stack usage. Reported by
3476 Max. (CVE-2015-8779)
3478 * The nan, nanf and nanl functions no longer have unbounded stack usage
3479 depending on the length of the string passed as an argument to the
3480 functions. Reported by Joseph Myers. (CVE-2014-9761)
3482 * A stack-based buffer overflow was found in libresolv when invoked from
3483 libnss_dns, allowing specially crafted DNS responses to seize control
3484 of execution flow in the DNS client. The buffer overflow occurs in
3485 the functions send_dg (send datagram) and send_vc (send TCP) for the
3486 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3487 family. The use of AF_UNSPEC triggers the low-level resolver code to
3488 send out two parallel queries for A and AAAA. A mismanagement of the
3489 buffers used for those queries could result in the response of a query
3490 writing beyond the alloca allocated buffer created by
3491 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3492 the overflow. Thanks to the Google Security Team and Red Hat for
3493 reporting the security impact of this issue, and Robert Holiday of
3494 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3496 The following bugs are resolved with this release:
3498 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3499 [887] math: Math library function "logb" and "nextafter" inconsistent
3500 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3501 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3502 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3503 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3505 [4404] localedata: German translation of "Alarm clock" is misleading
3506 [6799] math: nextafter() and nexttoward() doen't set errno on
3507 overflow/underflow errors
3508 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3510 [10432] nis: _nss_nis_setnetgrent assertion failure
3511 [11460] libc: fts has no LFS support
3512 [12926] network: getaddrinfo()/make_request() may spin forever
3513 [13065] nptl: Race condition in pthread barriers
3514 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3515 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3517 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3518 [14912] libc: Rename non-installed bits/*.h headers
3519 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3520 [15367] math: Let gcc use __builtin_isinf
3521 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3522 [15421] math: lgamma wrongly sets signgam for ISO C
3523 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3524 FE_INVALID with argument out of range
3525 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3527 [15786] dynamic-link: ifunc resolver functions can smash function
3529 [15918] math: Unnecessary check for equality in hypotf()
3530 [16061] localedata: Review / update transliteration data
3531 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3533 [16141] time: strptime %z offset restriction
3534 [16171] math: drem should be alias of remainder
3535 [16296] math: fegetround is pure?
3536 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3537 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3539 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3540 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3542 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3543 "Exception "Inexact" set" on ppc32
3544 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3545 [16517] math: Missing underflow exception from tanf/tan/tanl
3546 [16519] math: Missing underflow exception from sinhf
3547 [16520] math: Missing underflow exception from tanhf
3548 [16521] math: Missing underflow exception from exp2
3549 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3551 [16734] stdio: fopen calls mmap to allocate its buffer
3552 [16961] math: nan function incorrect handling of bad sequences
3553 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3554 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3555 [16985] locale: localedef: confusing error message when opening output
3557 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3558 [17197] locale: Redundant shift character in iconv conversion output at
3560 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3561 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3562 [17250] dynamic-link: static linking breaks nss loading
3563 (getaddrinfo/getpwnam/etc...)
3564 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3566 [17441] math: isnan() should use __builtin_isnan() in GCC
3567 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3568 (related to lock elision)
3569 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3570 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3571 [17887] time: strptime should be able to parse "+01:00" style timezones
3572 [17905] libc: catopen() Multiple unbounded stack allocations
3574 [18084] libc: backtrace (..., 0) dumps core on x86
3575 [18086] libc: nice() sets errno to 0 on success
3576 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3577 is too large (CVE-2015-8778)
3578 [18251] dynamic-link: SONAME missing when audit modules provides path
3579 [18265] libc: add attributes for wchar string and memory functions
3580 [18370] math: csqrt missing underflows
3581 [18421] libc: [hppa] read-only segment has dynamic relocations
3582 [18472] libc: Obsolete syscall wrappers should be compat symbols
3583 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3584 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3585 [18525] localedata: Remove locale timezone information
3586 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3587 [18568] localedata: Update locale data to Unicode 8.0
3588 [18589] locale: sort-test.sh fails at random
3589 [18595] math: ctan, ctanh missing underflows
3590 [18604] libc: assert macro-expands its argument
3591 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3592 contains a vector instruction exception.
3593 [18611] math: j1, jn missing errno setting on underflow
3594 [18618] localedata: sync Chechen locale definitions with other *_RU
3596 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3597 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3598 [18665] network: In send_dg, the recvfrom function is NOT always using the
3599 buffer size of a newly created buffer (CVE-2015-7547)
3600 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3602 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3604 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3605 [18699] math: tilegx cproj() for various complex infinities does not yield
3607 [18724] libc: Harden put*ent functions against data injection
3608 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3609 [18755] build: build errors with -DNDEBUG
3610 [18757] stdio: fmemopen fails to set errno on failure
3611 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3613 [18781] libc: openat64 lacks O_LARGEFILE
3614 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3615 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3616 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3617 [18790] math: [ldbl-128ibm] tanhl inaccurate
3618 [18795] libc: stpncpy fortification misses buffer lengths that are
3619 statically too large
3620 [18796] build: build fails for --disable-mathvec
3621 [18803] math: hypot missing underflows
3622 [18820] stdio: fmemopen may leak memory on failure
3623 [18823] math: csqrt spurious underflows
3624 [18824] math: fma spurious underflows
3625 [18825] math: pow missing underflows
3626 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3627 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3628 [18870] build: sem_open.c fails to compile with missing symbol
3630 [18872] stdio: Fix memory leak in printf_positional
3631 [18873] libc: posix_fallocate overflow check ineffective
3632 [18875] math: Excess precision leads incorrect libm
3633 [18877] libc: arm: mmap offset regression
3634 [18887] libc: memory corruption when using getmntent on blank lines
3635 [18918] localedata: hu_HU: change time to HH:MM:SS format
3636 [18921] libc: Regression: extraneous stat() and fstat() performed by
3638 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3639 binaries (CVE-2015-8777)
3640 [18951] math: tgamma missing underflows
3641 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3643 [18953] localedata: lt_LT: change currency symbol to the euro
3644 [18956] math: powf inaccuracy
3645 [18961] math: [i386] exp missing underflows
3646 [18966] math: [i386] exp10 missing underflows
3647 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3648 [18969] build: multiple string test failures due to missing locale
3650 [18970] libc: Reference of pthread_setcancelstate in libc.a
3651 [18977] math: float / long double Bessel functions not in XSI POSIX
3652 [18980] math: i386 libm functions return with excess range and precision
3653 [18981] math: i386 scalb*, ldexp return with excess range and precision
3654 [18982] stdio: va_list and vprintf
3655 [18985] time: Passing out of range data to strftime() causes a segfault
3657 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3658 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3659 [19012] locale: iconv_open leaks memory on error path
3660 [19016] math: clog, clog10 inaccuracy
3661 [19018] nptl: Mangle function pointers in tls_dtor_list
3662 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3663 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3664 [19048] malloc: malloc: arena free list can become cyclic, increasing
3666 [19049] math: [powerpc] erfc incorrect zero sign
3667 [19050] math: [powerpc] log* incorrect zero sign
3668 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3669 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3670 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3671 [19074] network: Data race in _res_hconf_reorder_addrs
3672 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3673 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3674 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3676 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3678 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3679 [19086] manual: posix_fallocate64 documented argument order is wrong.
3680 [19088] math: lround, llround missing exceptions close to overflow
3682 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3683 [19095] math: dbl-64 lrint incorrect for 64-bit long
3684 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3685 [19124] dynamic-link: ld.so failed to build with older assmebler
3686 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3687 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3688 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3689 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3690 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3691 pthread_setaffinity_np
3692 [19156] math: [ldbl-128] j0l spurious underflows
3693 [19164] nptl: tst-getcpu fails with many possible CPUs
3694 [19168] math: math/test-ildoubl and math/test-ldouble failure
3695 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3696 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3698 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3699 (FE_NOMASK_ENV) do not clear SSE exceptions
3700 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3701 _int_new_arena/reused_arena
3702 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3703 [19201] math: dbl-64 remainder incorrect sign of zero result
3704 [19205] math: bits/math-finite.h conditions do not match math.h and
3706 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3707 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3708 for C99-based standards
3709 [19212] libc: features.h not -Wundef clean
3710 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3712 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3713 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3714 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3716 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3717 "inexact" exceptions
3718 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3720 [19242] libc: strtol incorrect in Turkish locales
3721 [19243] malloc: reused_arena can pick an arena on the free list, leading
3722 to an assertion failure and reference count corruption
3723 [19253] time: tzset() ineffective when temporary TZ did not include DST
3725 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3726 [19270] math: [hppa] Shared libm missing __isnanl
3727 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3728 MAP_HUGETLB and MAP_STACK defines
3729 [19313] nptl: Wrong __cpu_mask for x32
3730 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3731 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3732 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3733 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3734 [19363] time: x32: times() return value wrongly truncates/sign extends
3736 [19367] dynamic-link: Improve branch prediction on Silvermont
3737 [19369] network: Default domain name not reset by res_ninit when "search"
3738 / "domain" entry is removed from resolv.conf
3739 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3741 [19385] localedata: bg_BG: time separator should be colon, not comma
3742 [19408] libc: linux personality syscall wrapper may erroneously return an
3743 error on 32-bit architectures
3744 [19415] libc: dladdr returns wrong names on hppa
3745 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3746 IBM905, IBM907, and IBM909
3747 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3748 [19443] build: build failures with -DDEBUG
3749 [19451] build: Make check fails on test-double-vlen2
3750 [19462] libc: Glibc failed to build with -Os
3751 [19465] math: Wrong code with -Os
3752 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3754 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3756 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3757 [19486] math: S390: Math tests fail with "Exception Inexact set".
3758 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3759 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3761 [19590] math: Fail to build shared objects that use libmvec.so functions.
3765 * The following bugs are resolved with this release:
3767 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3768 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3769 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3770 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3771 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3772 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3773 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3774 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3775 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3776 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3777 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3778 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3779 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3780 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3781 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3782 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3783 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3784 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3785 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3786 18657, 18676, 18694, 18696, 18887.
3788 * Cache information can be queried via sysconf() function on s390 e.g. with
3789 _SC_LEVEL1_ICACHE_SIZE as argument.
3791 * A buffer overflow in gethostbyname_r and related functions performing DNS
3792 requests has been fixed. If the NSS functions were called with a
3793 misaligned buffer, the buffer length change due to pointer alignment was
3794 not taken into account. This could result in application crashes or,
3795 potentially arbitrary code execution, using crafted, but syntactically
3796 valid DNS responses. (CVE-2015-1781)
3798 * The time zone file parser has been made more robust against crafted time
3799 zone files, avoiding heap buffer overflows related to the processing of
3800 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3801 large time zone data files. Overly long time zone specifiers in the TZ
3802 variable no longer result in stack overflows and crashes.
3804 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3805 for LD and GD on x86 and x86-64, has been implemented. You will need
3806 binutils-2.24 or later to enable this optimization.
3808 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3809 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3810 Hat). These updates cause user visible changes, such as the fix for bug
3813 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3814 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3815 condition in some applications.
3817 * Added vector math library named libmvec with the following vectorized x86_64
3818 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3820 The library can be disabled with --disable-mathvec. Use of the functions is
3821 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3822 Shared library libmvec.so is linked in as needed when using -lm (no need to
3823 specify -lmvec explicitly for not static builds).
3824 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3826 * A new fmemopen implementation has been added with the goal of POSIX
3827 compliance. The new implementation fixes the following long-standing
3828 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3829 old implementation is still present for use be by existing binaries.
3831 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3832 releases. It has been fixed to match 2.19 and older, but binaries built
3833 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3835 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3836 Contributed by Roland McGrath (Google).
3838 * The header <regexp.h> is deprecated, and will be removed in a future
3839 release. Use of this header will trigger a deprecation warning.
3840 Application developers should update their code to use <regex.h> instead.
3842 This header was formerly part of SUS, but was deprecated in 1994 and
3843 removed from the standard in 2001. Also, the glibc implementation
3844 leaks memory. See BZ#18681 for more details.
3848 * The following bugs are resolved with this release:
3850 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3851 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3852 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3853 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3854 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3855 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3856 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3857 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3858 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3859 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3862 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3863 too little memory for the to-be-scanned arguments and overflow the
3864 allocated buffer. The implementation now correctly computes the required
3865 buffer size when using malloc, and switches to malloc from alloca as
3868 * A new semaphore algorithm has been implemented in generic C code for all
3869 machines. Previous custom assembly implementations of semaphore were
3870 difficult to reason about or ensure that they were safe. The new version
3871 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3872 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3873 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3875 * Port to Altera Nios II has been contributed by Mentor Graphics.
3877 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3878 implementations for powerpc64/powerpc64le.
3879 Implemented by Adhemerval Zanella (IBM).
3881 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3882 and powerpc64le. This may improve lock scaling of existing programs on
3883 HTM capable systems. The lock elision code is only enabled with
3884 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3885 powerpc will issue a transaction abort on every syscall to avoid side
3886 effects being visible outside transactions.
3888 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3889 AArch64. Contributed by ARM Ltd.
3891 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3893 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3894 under certain input conditions resulting in the execution of a shell for
3895 command substitution when the application did not request it. The
3896 implementation now checks WRDE_NOCMD immediately before executing the
3897 shell and returns the error WRDE_CMDSUB as expected.
3899 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3900 processing format strings with a large number of format specifiers.
3902 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3903 infinite loop if the DNS response contained a PTR record of an unexpected
3906 * The minimum GCC version that can be used to build this version of the GNU
3907 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3908 still be used to compile programs using the GNU C Library.
3910 * The GNU C Library is now built with -Werror by default. This can be
3911 disabled by configuring with --disable-werror.
3913 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3915 * The obsolete sigvec function has been removed. This was the original
3916 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3917 programs have been using instead for about 25 years. Of course, ABI
3918 compatibility for old binaries using sigvec remains intact.
3920 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3921 with newer versions of bison.
3923 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3924 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3925 registers overlay two consecutive single-precision registers. MIPS32R2
3926 introduced a new FPU mode (FR=1) where double-precision registers extend the
3927 corresponding single-precision registers which is incompatible with the
3928 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3929 require the use of FR=1 making a transition necessary. New o32 ABI
3930 extensions enable users to migrate over time from the original o32 ABI
3931 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3932 tracks the ABI of any loaded object and verifies that new objects are
3933 compatible. Mode transitions will also be requested as required and
3934 unsupportable objects will be rejected. The ABI checks include both soft and
3935 hard float ABIs for o32, n32 and n64.
3937 GCC 5 with GNU binutils 2.25 onwards:
3938 It is strongly recommended that all o32 system libraries are built using the
3939 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3940 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3941 compiler using --with-fp-32=xx to set this by default.
3945 * The following bugs are resolved with this release:
3947 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3948 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3949 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3950 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3951 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3952 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3953 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3954 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3955 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3956 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3957 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3958 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3959 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3960 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3961 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3963 * Reverted change of ABI data structures for s390 and s390x:
3964 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3965 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3966 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3967 are preserved pointing straight to the same implementation as the old ones.
3968 Given that, new callers will simply provide a too-big buffer to these
3969 functions. Any applications/libraries out there that embed jmp_buf or
3970 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3971 against 2.19 headers will have to rebuilt again. This is necessary in any
3972 case to revert the breakage in their ABI caused by the glibc change.
3974 * Support for file description locks is added to systems running the
3975 Linux kernel. The standard file locking interfaces are extended to
3976 operate on file descriptions, not file descriptors, via the use of
3977 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3978 are associated with an open file instead of a process.
3980 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3982 * The minimum Linux kernel version that this version of the GNU C Library
3983 can be used with is 2.6.32.
3985 * Running the testsuite no longer terminates as soon as a test fails.
3986 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3987 with PASS or FAIL lines for individual tests. A summary of the results is
3988 printed, including a list of failing lists, and "make check" exits with
3989 error status if there were any unexpected failures. "make check
3990 stop-on-test-failure=y" may be used to keep the old behavior.
3992 * The am33 port, which had not worked for several years, has been removed
3995 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3996 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3997 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3998 conflicted with POSIX (support for which was removed in 2.19), the
3999 interfaces those macros enabled remain available when compiling with
4000 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4001 test macros defined.
4003 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4005 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4006 This may improve lock scaling of existing programs on TX capable systems.
4007 The lock elision code is only built with --enable-lock-elision=yes and
4008 then requires a GCC version supporting the TX builtins. With lock elision
4009 default mutexes are elided via __builtin_tbegin, if the cpu supports
4010 transactions. By default lock elision is not enabled and the elision code
4013 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4014 copy the path argument. This allowed programs to cause posix_spawn to
4015 deference a dangling pointer, or use an unexpected pathname argument if
4016 the string was modified after the posix_spawn_file_actions_addopen
4019 * All supported architectures now use the main glibc sysdeps directory
4020 instead of some being in a separate "ports" directory (which was
4021 distributed separately before glibc 2.17).
4023 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4024 On configurations that support it (all Linux configurations), it's now
4025 used regardless of the --enable-add-ons switch to configure. It is no
4026 longer possible to build such configurations without pthreads support.
4028 * Locale names, including those obtained from environment variables (LANG
4029 and the LC_* variables), are more tightly checked for proper syntax.
4030 setlocale will now fail (with EINVAL) for locale names that are overly
4031 long, contain slashes without starting with a slash, or contain ".." path
4032 components. (CVE-2014-0475) Previously, some valid locale names were
4033 silently replaced with the "C" locale when running in AT_SECURE mode
4034 (e.g., in a SUID program). This is no longer necessary because of the
4037 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4038 with application code using Intel MPX instructions. (With all previous
4039 versions, the MPX register state could be clobbered when making calls
4040 into or out of a shared library.) Note that while the new dynamic
4041 linker is compatible with all known x86 hardware whether or not it
4042 supports Intel MPX, some x86 instruction-set emulators might fail to
4043 handle the new instruction encodings. This is known to affect Valgrind
4044 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4045 release), and might affect other tools that do instruction emulation.
4047 * Support for loadable gconv transliteration modules has been removed.
4048 The support for transliteration modules has been non-functional for
4049 over a decade, and the removal is prompted by security defects. The
4050 normal gconv conversion modules are still supported. Transliteration
4051 with //TRANSLIT is still possible, and the //IGNORE specifier
4052 continues to be supported. (CVE-2014-5119)
4054 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4055 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4056 resulting a denial-of-service security vulnerability in applications which
4057 use functions related to iconv. (CVE-2014-6040)
4061 * The following bugs are resolved with this release:
4063 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4064 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4065 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4066 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4067 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4068 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4069 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4070 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4071 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4072 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4073 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4074 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4075 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4076 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4077 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4078 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4079 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4080 16431, 16453, 16474, 16506, 16510, 16529
4082 * Slovenian translations for glibc messages have been contributed by the
4083 Translation Project's Slovenian team of translators.
4085 * The public headers no longer use __unused nor __block. This change is to
4086 support compiling programs that are derived from BSD sources and use
4087 __unused internally, and to support compiling with Clang's -fblock
4088 extension which uses __block.
4090 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4091 large collation sequences to optimize multiple passes. This cache
4092 computation may overflow for large collation sequences and may cause a
4093 stack or buffer overflow. This is now fixed to use a slower algorithm
4094 which does not use a cache if there is an integer overflow.
4096 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4097 rules for large collation sequences to optimize multiple passes and falls
4098 back to alloca if malloc fails, resulting in a possible stack overflow.
4099 The implementation now falls back to an uncached collation sequence lookup
4102 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4103 initialized for static applications resulting in the security feature
4104 being disabled. The pointer guard is now correctly initialized to a
4105 random value for static applications. Existing static applications need
4106 to be recompiled to take advantage of the fix (bug 15754).
4108 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4109 to the d_name member of struct dirent, or omit the terminating NUL
4110 character. (Bugzilla #14699).
4112 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4113 aligned_alloc functions could allocate too few bytes or corrupt the
4114 heap when passed very large allocation size values (Bugzilla #15855,
4117 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4118 for AF_INET6 has been fixed (Bugzilla #16072).
4120 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4121 pap_CW, quz_PE, the_NP.
4123 * Substantially revised locales: gd_GB, ht_HT
4125 * The LC_ADDRESS field was updated to support country_car for almost all
4128 * ISO 1427 definitions were updated.
4130 * ISO 3166 definitions were updated.
4132 * The localedef utility now supports --big-endian and --little-endian
4133 command-line options to generate locales for a different system from that
4134 for which the C library was built.
4136 * Binary locale files now only depend on the endianness of the system for
4137 which they are generated and not on other properties of that system. As a
4138 consequence, binary files generated with new localedef may be incompatible
4139 with old versions of the GNU C Library, and binary files generated with
4140 old localedef may be incompatible with this version of the GNU C Library,
4141 in the following circumstances:
4143 + Locale files may be incompatible on m68k systems.
4145 + Locale archive files (but not separate files for individual locales) may
4146 be incompatible on systems where plain "char" is signed.
4148 * The configure option --disable-versioning has been removed. Builds with
4149 --disable-versioning had not worked for several years.
4151 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4152 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4154 * SystemTap probes for malloc have been introduced.
4156 * SystemTap probes for slow multiple precision fallback paths of
4157 transcendental functions have been introduced.
4159 * Support for powerpc64le has been added.
4161 * The soft-float powerpc port now supports e500 processors.
4163 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4165 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4166 set of header declarations that are enabled by default, even when other
4167 feature test macros or compiler options such as -std=c99 would otherwise
4168 disable some of those declarations.
4170 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4171 conflict with POSIX. The libbsd-compat library (which was a dummy library
4172 that did nothing) has also been removed.
4174 * Preliminary documentation about Multi-Thread, Async-Signal and
4175 Async-Cancel Safety has been added.
4177 * Change of ABI data structures for s390 and s390x:
4178 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4179 allow for future hardware extensions. All library functions that accept or
4180 return these structures were versioned in order to provide backwards
4181 compatibility with existing code. However, not all cases can be handled
4182 with interface versioning. If an application embeds either structure into
4183 another structure and that structure is passed to another compilation unit
4184 which expects the newer larger-sized object then any access to the new
4185 fields will result in undefined behaviour. Similarly any access to fields
4186 that were moved by the enlarging of the structures will cause undefined
4187 behaviour. To fix the undefined behaviour all objects that are part of the
4188 final in-memory image must agree on the size of structures, and this may
4189 require recompilation.
4193 * The following bugs are resolved with this release:
4195 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4196 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4197 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4198 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4199 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4200 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4201 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4202 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4203 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4204 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4205 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4206 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4207 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4210 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4211 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4212 Distributions can re-enable building and using pt_chown via the new configure
4213 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4214 considerable security risks and should only be used if the distribution
4215 understands and accepts the risks.
4217 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4220 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4221 fixed (Bugzilla #15330).
4223 * Add support for calling C++11 thread_local object destructors on thread
4224 and program exit. This needs compiler support for offloading C++11
4225 destructor calls to glibc.
4227 * Improved worst case performance of libm functions with double inputs and
4230 * Support for priority inherited mutexes in pthread condition variables on
4231 non-x86 architectures.
4233 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4235 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4237 * Optimized string functions for ARM. Implemented by Will Newton and
4240 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4242 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4245 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4246 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4248 * Added a benchmark framework to track performance of functions in glibc.
4250 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4251 It is based on draft TS 18661 and currently enabled as a GNU extension.
4253 * On Linux, the clock function now uses the clock_gettime system call
4254 for improved precision, rather than old times system call.
4256 * Added support for version-3 tz format files. This is needed when using
4257 the tz database release 2013e or later, and affects a few unusual cases --
4258 currently only TZ='America/Godthab' for time stamps after 2037.
4260 * Added new API functions pthread_getattr_default_np and
4261 pthread_setattr_default_np to get and set the default pthread
4262 attributes of a process.
4264 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4265 This may improve lock scaling of existing programs on TSX capable systems.
4266 When the --enable-lock-elision=yes parameter is specified at configure
4267 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4270 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4271 availability). Implemented by Ryan S. Arnold.
4273 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4277 * The following bugs are resolved with this release:
4279 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4280 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4281 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4282 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4283 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4284 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4285 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4286 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4287 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4288 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4289 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4290 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4291 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4292 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4293 14879, 14889, 14893, 14898, 14914.
4295 * Optimization of memcpy for MIPS.
4297 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4298 EMFILE has been fixed (Bugzilla #14889).
4300 * The add-on ports collection is now distributed in the "ports" subdirectory
4301 of the main GNU C Library distribution, rather than separately.
4303 * Port to ARM AArch64 contributed by Linaro.
4305 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4306 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4308 Implemented by Andreas Krebbel.
4310 * The new function secure_getenv allows secure access to the environment,
4311 returning NULL if running in a SUID/SGID process. This function replaces
4312 the internal function __secure_getenv.
4314 * SystemTap static probes have been added into the dynamic linker.
4315 Implemented by Gary Benson.
4317 * Optimizations of string functions strstr, strcasestr and memmem.
4318 Implemented by Maxim Kuvyrkov.
4320 * The minimum Linux kernel version that this version of the GNU C Library
4321 can be used with is 2.6.16.
4323 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4324 powerpc POWER7. Implemented by Will Schmidt.
4326 * New configure option --disable-nscd builds the C library such that it
4327 never attempts to contact the Name Service Caching Daemon (nscd).
4328 New configure option --disable-build-nscd avoids building nscd itself;
4329 this is the default if --disable-nscd is used.
4331 * Improved support for cross-compilation, including cross-testing and
4332 bootstrap builds without a previously built glibc.
4334 * Several testsuite tests are now able to test multiple IFUNC variants of an
4335 interface, rather than just testing the one that would be chooen by
4338 * New configure options --with-bugurl and --with-pkgversion, for
4339 distributors to use to embed their bug-reporting and package version
4340 information in --help and --version output.
4342 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4343 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4344 allows creation of chroots without the procfs mounted on /proc.
4346 * The `crypt' function now fails if passed salt bytes that violate the
4347 specification for those values. On Linux, the `crypt' function will
4348 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4349 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4350 when the mode is enabled.
4352 * The `clock_*' suite of functions (declared in <time.h>) is now available
4353 directly in the main C library. Previously it was necessary to link with
4354 -lrt to use these functions. This change has the effect that a
4355 single-threaded program that uses a function such as `clock_gettime' (and
4356 is not linked with -lrt) will no longer implicitly load the pthreads
4357 library at runtime and so will not suffer the overheads associated with
4358 multi-thread support in other code such as the C++ runtime library.
4360 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4365 * The following bugs are resolved with this release:
4367 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4368 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4369 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4370 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4371 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4372 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4373 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4374 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4375 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4376 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4377 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4378 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4379 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4380 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4381 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4382 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4383 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4384 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4385 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4386 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4387 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4388 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4391 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4392 configuring glibc with:
4393 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4394 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4395 Implemented by H.J. Lu.
4399 + define static_assert
4401 + do not declare gets
4403 + declare at_quick_exit and quick_exit also for ISO C11
4405 + aligned_alloc. NB: The code is deliberately allows the size parameter
4406 to not be a multiple of the alignment. This is a moronic requirement
4407 in the standard but it is only a requirement on the caller, not the
4410 + timespec_get added
4412 + uchar.h support added
4414 + CMPLX, CMPLXF, CMPLXL added
4416 Implemented by Ulrich Drepper.
4418 * Support for the IA-64 has been moved to ports.
4420 * Remove support for anything but ELF binary format
4422 * Checking versions of poll, ppoll added.
4423 Implemented by Ulrich Drepper.
4425 * More generic and 64-bit performance optimizations to math functions.
4426 Implemented by Ulrich Drepper.
4428 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4429 headers and functions available at compile time as they were before
4430 version 2.14. This option will be removed at some time in the future
4431 after the TI-RPC library becomes fully sufficient for the needs of
4432 existing applications.
4434 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4435 Note that glibc is not expected to work with any Linux kernel version
4438 * New header <sys/auxv.h> and function getauxval allowing easy access to
4439 the AT_* key-value pairs passed from the Linux kernel. The header also
4440 defines the HWCAP_* bits associated with the AT_HWCAP key.
4442 * New locales: mag_IN
4444 * New configure option --enable-systemtap builds SystemTap static probes
4445 into libc for setjmp and longjmp and into libpthread for various operations.
4446 So far the setjmp/longjmp probes and some of the libpthread probes are
4447 provided only for i*86 and x86_64.
4448 Implemented by Roland McGrath and Rayson Ho.
4450 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4452 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4455 * More optimized functions for SPARC. Implemented by David S. Miller.
4457 * Improved support for cross-compilation, especially bootstrap builds
4458 without a previously built glibc.
4460 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4461 Chris Metcalf from Tilera.
4463 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4464 now supported for ARM processors.
4466 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4467 as the name of the dynamic linker, to distinguish it from the
4468 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4470 * Support for CRIS has been removed from ports.
4472 * A new class of installed header has been documented for low-level
4473 platform-specific functionality. PowerPC added the first instance with a
4474 function to provide time base register access. Contributed by Tulio
4475 Magno Quites Machado Filho.
4477 * ix86 configurations now install header files that are consistent with
4478 what x86-64 configurations install. These same header files can be used
4479 for -m32, -m64, or -mx32 builds.
4480 Contributed by H.J. Lu.
4482 * Math library bug fixes. A thorough audit of all open math library bugs was
4483 conducted by Joseph Myers. Significant progress was made on many math
4484 library bugs resulting in more accurate exceptions and function results.
4485 Many thanks to all those that contributed including Andreas Jaeger for his
4486 patch review and work on the x87 trigonometric instruction issues.
4488 * Timezone data is no longer installed. Timezone-related binaries and scripts
4489 will continue to be installed. Users should obtain their timezone data from
4490 their distribution provider or from the tzdata package at
4491 <ftp://munnari.oz.au/pub/>.
4495 * The following bugs are resolved with this release:
4497 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4498 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4499 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4500 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4501 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4502 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4503 13484, 13506, 13515, 13523, 13524, 13538, 13540
4505 * New program pldd to list loaded object of a process
4506 Implemented by Ulrich Drepper.
4508 * Add nss_db support back to glibc. No more dependency on Berkeley db
4509 and support for initgroups lookups.
4510 Implemented by Ulrich Drepper.
4512 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4513 Contributed by HJ Lu.
4515 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4516 Contributed by HJ Lu.
4518 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4519 on x86-32 and x86-64.
4520 Contributed by Liubov Dmitrieva.
4522 * Optimized strchr and strrchr for SSE on x86-32.
4523 Contributed by Liubov Dmitrieva.
4525 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4526 for x86-64 and x86-32.
4527 Contributed by Liubov Dmitrieva.
4529 * New interfaces: scandirat, scandirat64
4530 Implemented by Ulrich Drepper.
4532 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4533 Implemented by Ulrich Drepper.
4535 * nscd now also caches the netgroup database.
4536 Implemented by Ulrich Drepper.
4538 * Integrate libm with gcc's -ffinite-math-only option.
4539 Implemented by Ulrich Drepper.
4541 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4542 to math functions. Implemented by Ulrich Drepper.
4544 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4545 Implemented by Ulrich Drepper.
4547 * New Linux interfaces: process_vm_readv, process_vm_writev
4549 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4550 Implemented by Ulrich Drepper.
4552 * Optimized nearbyint and strcasecmp for PPC.
4553 Implemented by Adhemerval Zanella.
4555 * New locales: bho_IN, unm_US, es_CU, ta_LK
4559 * The following bugs are resolved with this release:
4561 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4562 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4563 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4564 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4565 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4566 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4567 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4568 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4569 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4570 12795, 12811, 12813, 12814, 12841
4572 * The RPC implementation in libc is obsoleted. Old programs keep working
4573 but new programs cannot be linked with the routines in libc anymore.
4574 Programs in need of RPC functionality must be linked against TI-RPC.
4575 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4577 Visible changes of this change include (obviously) the inability to link
4578 programs using RPC functions without referencing the TI-RPC library and the
4579 removal of the RPC headers from the glibc headers.
4580 Implemented by Ulrich Drepper.
4582 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4583 syncfs, setns, sendmmsg
4585 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4586 yue_HK, lij_IT, mhr_RU
4588 * New encodings: CP770, CP771, CP772, CP773, CP774
4590 * New program sotruss to trace calls through PLTs
4591 Implemented by Ulrich Drepper.
4593 * The malloc hook implementation is marked deprecated and will be removed
4594 from the default implementation in the next version. The design never
4595 worked ever since the introduction of threads. Even programs which do
4596 not create threads themselves can use multiple threads created internally.
4600 * The following bugs are resolved with this release:
4602 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4603 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4604 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4605 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4608 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4610 * POWER7 optimizations: memset, memcmp, strncmp
4612 * New optimized string functions for x86-64: strnlen (SSE2),
4613 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4614 Implemented by Ulrich Drepper.
4618 * The following bugs are resolved with this release:
4620 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4621 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4622 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4623 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4624 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4625 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4626 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4627 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4629 * New interfaces: pthread_getname_np, pthread_setname_np
4631 * New Linux interface: recvmmsg
4633 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4635 * The dynamic linker now recognizes supported ABI versions from the
4636 EI_ABIVERSION field in the ELF header.
4637 Implemented by Ulrich Drepper.
4639 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4640 will not be used to fill in password fields in the passwd.byname replies.
4641 Instead it is used to synthesize the shadow.byname table, should it be
4642 missing. This is a useful mode in some installations involving Solaris.
4643 Implemented by Ulrich Drepper.
4645 * New locales: kok_IN, sq_MK, cv_RU
4649 * The following bugs are resolved with this release:
4651 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4652 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4653 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4654 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4655 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4656 10789, 10817, 10823, 10840, 10847
4658 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4660 Implemented by Ulrich Drepper.
4662 * Checking version of longjmp added that fails if an uninitialized stack
4663 frame would be created. Implemented by Ulrich Drepper.
4665 * STT_GNU_IFUNC is now supported in static executables.
4666 Implemented by H.J. Lu.
4668 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4670 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4671 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4672 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4673 Contributed by H.J. Lu.
4675 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4676 Implemented by Ulrich Drepper.
4678 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4680 Contributed by H.J. Lu.
4682 * Support for fma instruction in AVX on x86-64.
4683 Implemented by H.J. Lu and Ulrich Drepper.
4685 * AVX support in x86-64 auditing support in ld.so.
4686 Implemented by H.J. Lu.
4688 * STB_GNU_UNIQUE support added.
4689 Implemented by Ulrich Drepper.
4691 * Implement second fallback mode for optimized DNS lookup for even more
4692 broken environments. If two requests from the same port are not
4693 handled correctly close the socket and open a new one before sending
4694 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4695 can be used to select this mode right away, instead of rediscovering the
4696 necessity is every process again.
4697 Implemented by Ulrich Drepper.
4699 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4700 Implemented by Adam Tkac.
4702 * Optimized iconv conversions for S390x.
4703 Implemented by Andreas Krebbel.
4705 * Using condvars with PI mutexes is now more efficient due to kernel
4706 support for requeueing to PI futexes. NPTL support added for x86-64.
4707 Implemented by Ulrich Drepper.
4709 * New locales: ps_AF, my_MM
4713 * The following bugs are resolved with this release:
4715 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4716 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4717 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4718 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4719 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4721 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4722 Implemented by Ulrich Drepper.
4724 * New Linux interfaces: accept4, fallocate, fallocate64.
4725 Implemented by Ulrich Drepper.
4727 * Correct declarations of string function when used in C++ code. This
4728 could lead to compile errors for invalid C++ code.
4730 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4733 * New POSIX 2008 interface: psiginfo
4734 Implemented by Ulrich Drepper.
4736 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4737 Implemented by Ulrich Drepper.
4739 * Support for selecting between multiple function definitions at runtime
4740 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4742 * The libcrypt library can now use the hash function implementations in
4743 NSS. Implemented by Ulrich Drepper.
4745 * The malloc implementation can be compiled to be less memory efficient
4746 but higher performing in multi-threaded programs.
4747 Implemented by Ulrich Drepper.
4749 * New locales: nan_TW@latin, ks_IN
4751 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4752 Implemented by Ulrich Drepper.
4754 * Extended printf hook support. It is possible to use user-defined types
4755 and extend existing format specifiers.
4756 Implemented by Ulrich Drepper.
4758 * Handling for group shadow files has been added.
4759 Implemented by Ulrich Drepper.
4761 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4762 servers (the case, e.g., for some people using the built-in DNS
4763 server in ADSL modems/routers). There is a once-per-process timeout
4764 in case of a broken server. To avoid it, users can run nscd or put
4765 'options single-request' in /etc/resolv.conf.
4766 Implemented by Ulrich Drepper.
4770 * The following bugs are resolved with this release:
4772 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
4773 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
4774 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
4775 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
4776 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
4778 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4779 up at the same time. Implemented by Ulrich Drepper.
4781 * TLS descriptors for LD and GD on x86 and x86-64.
4782 Implemented by Alexandre Oliva.
4784 * getaddrinfo now handles DCCP and UDPlite.
4785 Implemented by Ulrich Drepper.
4787 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4788 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4789 Implemented by Ulrich Drepper.
4791 * New implementation of memmem, strstr, and strcasestr which is O(n).
4792 Implemented by Eric Blake.
4794 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4796 * Implement "e" option for popen to open file descriptor with the
4797 close-on-exec flag set. Implemented by Ulrich Drepper.
4799 * Implement "b" mode for fmemopen. In this mode writes writes don't
4800 implicitly add a NUL byte and seeks from the end of the buffer really
4801 use the buffer end, not the string length as the basis.
4802 Implemented by Ulrich Drepper.
4804 * Many functions, exported and internal, now atomically set the close-on-exec
4805 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4807 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4809 Implemented by Pravin Satpute.
4811 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4815 * The following bugs are resolved with this release:
4817 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4818 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4819 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4820 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4821 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4822 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4823 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4825 * New locales: bo_CN, bo_IN, shs_CA.
4827 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4829 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4830 Implemented by Pravin Satpute.
4832 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4834 * nscd caches now all timeouts for DNS entries
4835 Implemented by Ulrich Drepper.
4837 * nscd is more efficient and wakes up less often.
4838 Implemented by Ulrich Drepper.
4840 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4841 vdprintf, and obstack_vprintf.
4842 Implemented by Jakub Jelinek.
4844 * Faster memset for x86-64.
4845 Implemented by Harsha Jagasia and H.J. Lu.
4847 * Faster memcpy on x86.
4848 Implemented by Ulrich Drepper.
4850 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4851 Implemented by Ulrich Drepper.
4853 * Faster sqrt and sqrtf implemention for some PPC variants.
4854 Implemented by Steven Munroe.
4858 * The following bugs are resolved with this release:
4860 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4861 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4862 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4863 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4864 5071, 5103, 5104, 5112, 5113, 5184, 5186
4866 * More checking functions: fread, fread_unlocked, open*, mq_open.
4867 Implemented by Jakub Jelinek and Ulrich Drepper.
4869 * Extend fortification to C++. Implemented by Jakub Jelinek.
4871 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4872 by not recognizing 'a' as a modifier when those specs are requested.
4873 Implemented by Jakub Jelinek.
4875 * PPC optimizations to math and string functions.
4876 Implemented by Steven Munroe.
4878 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4879 options to be passed. Implemented by Ulrich Drepper.
4881 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4883 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4884 Implemented by Ulrich Drepper.
4886 * Handle private futexes in the NPTL implementation.
4887 Implemented by Jakub Jelinek and Ulrich Drepper.
4889 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4890 Implemented by Roland McGrath and Ulrich Drepper.
4892 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4894 * SHA-256 and SHA-512 based password encryption.
4895 Implemented by Ulrich Drepper.
4897 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4898 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4901 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4902 Implemented by Ulrich Drepper.
4906 * The following bugs are resolved with this release:
4908 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4909 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4910 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4911 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4912 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4913 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4914 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4917 * New Linux interfaces: epoll_pwait, sched_getcpu.
4919 * New generic interfaces: strerror_l.
4921 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4925 * The following bugs are resolved with this release:
4927 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4928 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4929 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4930 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4931 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4932 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4933 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4934 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4935 3225, 3251, 3252, 3253, 3273
4937 * For Linux, the sorting of addresses returned by getaddrinfo now also
4938 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4939 Implemented by Ulrich Drepper.
4941 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4942 Implemented by Ulrich Drepper.
4944 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4946 * New iconv module for MIK. Contributed by Alexander Shopov.
4948 * For sites with broken group and/or passwd database, the auto-propagate
4949 option of nscd can prevent creating ID lookup entries from the results
4950 of a name lookup and vice versa. This usually is no problem but some
4951 site might have problems with the default behavior.
4952 Implemented by Ulrich Drepper.
4954 * Iterating over entire database in NIS can be slow. With the
4955 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4956 to trade time for memory. The entire database will be read at once.
4957 Implemented by Ulrich Drepper.
4959 * The interfaces introduced in RFC 3542 have been implemented by
4962 * Support for the new ELF hash table format was added by Ulrich Drepper.
4964 * Support for priority inheritance mutexes added by Jakub Jelinek and
4967 * Support for priority protected mutexes added by Jakub Jelinek.
4969 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4970 or_IN, csb_PL, fy_NL, sr_ME.
4974 * More overflow detection functions.
4976 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4977 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4979 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4980 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4981 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4982 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4983 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4984 by Masahide Washizawa.
4986 * It is now possible to install audit libraries for the dynamic linker using
4987 LD_AUDIT. Implemented by Ulrich Drepper.
4989 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4990 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4991 For a libc and libpthread that works well on Linux 2.4 kernels, we
4992 recommend using the stable 2.3 branch.
4994 * The new function open_wmemstream acts like open_memstream,
4995 but uses a wchar_t wide character buffer.
4997 * The new function ppoll is an improved version of poll, similar to pselect.
4999 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5000 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5001 renameat, unlinkat, linkat, symlinkat, readlinkat.
5003 * New Linux kernel system calls: unshare,
5004 inotify_init, inotify_add_watch, inotify_rm_watch.
5006 * The euidaccess function is now also known by the alias eaccess,
5007 for compatibility with some other systems.
5009 * Timezone data updated to 2006b version.
5013 * The following bugs are resolved with this release:
5015 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5016 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5017 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5018 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5019 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5020 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5022 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5024 * As of this release, GCC 4 can be used to compile the C Library.
5026 * Timezone data updated to 2005m version.
5030 * The following bugs are resolved with this release:
5032 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5033 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5034 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5035 777, 787, 821, 822, 823, 825
5037 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5041 * Support for RFC 3678. Real implementations exist only for Linux so far.
5042 Implemented by Ulrich Drepper.
5044 * nscd can now cache entries persistently. Expiring entries are reloaded.
5045 For speedups the cache can be shared in memory with client processes.
5046 Implemented by Ulrich Drepper.
5048 * nscd can now perform SELinux checks.
5049 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5051 * getaddrinfo queries are now cached. Canonical name lookup is performed
5053 Implemented by Ulrich Drepper.
5055 * The nothrow function attribute is used when headers are used by gcc when
5056 compiling C code. This can avoid significant amounts of exception
5059 * The malloc functions perform more error checking and are stricter when
5060 it comes to reacting on errors. The default action is to terminate
5061 the process after showing an error message. Implemented by Ulrich Drepper.
5063 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5064 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5066 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5067 namespaces using the new function dlmopen(). This feature is of course,
5068 like most other dynamic loading functionality, not available in statically
5069 linked applications. Implemented by Ulrich Drepper.
5071 * Low-overhead boundary checking variants of string and some stdio functions
5072 were added. These are to be used in conjunction with a gcc patch by
5073 Jakub Jelinek which adds calls to these functions if possible.
5074 Implemented by Jakub Jelinek and Ulrich Drepper.
5076 * Old code for several operating systems and machine architectures that
5077 have not been in working condition in a long time have been removed from
5078 the main source tree maintained by the GNU C Library's maintainers.
5079 These files are now reside in the separate `ports' source module
5080 that is usable as an add-on when building the library.
5084 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5085 interrogate the dynamic linker, compatible with the Solaris interface.
5087 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5088 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5090 * getifaddrs now uses the netlink interface on Linux to get its information.
5091 Implemented by Thorsten Kukuk.
5093 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5094 Implemented by Ulrich Drepper.
5096 * support for non-executable stacks on x86 has been added. Changes mostly
5099 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5102 * getaddrinfo now performs destination address selection according to
5107 * Thread-safe interfaces for many functions that access locale data
5108 were added in version 2.3, but these features were omitted from NEWS.
5109 Many functions have variants with an `_l' suffix that take a `locale_t'
5110 object as a parameter rather than consulting the current locale.
5111 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5112 create and maintain `locale_t' objects. Additionally, the new function
5113 `uselocale' sets "the current locale" (as used by functions not so
5114 parameterized) set for an individual thread. These features were added
5115 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5117 * The functions getresuid, getresgid, setresuid, and setresgid, which
5118 have long been available on Linux, are now declared in <unistd.h>
5119 and are now also available on the Hurd.
5121 * ELF thread-local storage support (TLS) now works on x86-64.
5123 * The new dynamic string token $LIB is expanded in shared library names.
5124 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5126 * Aldy Hernandez contributed complete software floating point support for
5127 PowerPC machines with no FPU.
5129 * fexecve is implemented on Linux.
5131 * The `btowc' function should work at least twice as fast due to
5132 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5134 * With approriate thread add-ons cancelable functions are now implemented
5135 in libc.so as well. No need to call the function in libpthread. This
5136 change allowed to finally disable the incorrect and expensive handling
5137 of weak definition in ld.so.
5139 * Yet more PLT entries in libc.so have been removed. We finally arrived
5140 at the bare minimum. Startup times improved appropriately.
5142 * Support for the new Linux/x86 system call interface was added. The
5143 AT_SYSINFO auxiliary vector entry is recognized and handled.
5147 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5150 * iconv (the program and the interface) now accepts empty names (excluding
5151 options like //TRANSLIT) to mean "use charset of current locale".
5153 * localedef can now transliterate characters in strings which are not in
5154 the provided charmap. The information from the input locale is used.
5156 * Prelinking support was added for ELF targets. This requires additional
5157 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5159 * Read-only stdio streams now use mmap to speed up operation by eliminating
5160 copying and buffer underflows. To use add 'm' to the mode string of
5161 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5163 * The malloc functions were completely rewritten by Wolfram Gloger based
5164 on Doug Lea's malloc-2.7.0.c.
5166 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5167 implementation of regex.
5169 * Bruno Haible upgraded the iconv and locale implementation to support
5172 * Contents of the LC_* and LANG environment variables in the CEN style are
5173 not recognized anymore. It never was used. Change by Ulrich Drepper.
5175 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5176 thread-local storage (TLS) ABI on some platforms.
5177 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5179 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5180 EUC-JISX0213, and TSCII.
5182 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5183 BSD-compatible interface for getting all network interface addresses.
5184 Implementation for IPv4 by Roland McGrath.
5186 * Loading of locale data is faster due to the introduction of a locale
5187 archive. Implemented by Roland McGrath and Ulrich Drepper.
5189 * Startup times are significantly reduced by not using exported functions
5190 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5193 * Steven Munroe contributed a port to PowerPC64/Linux.
5197 * The Hurd now uses the GNU libio implementation of stdio rather than the
5198 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5200 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5201 with the same behavior as the Linux system call of the same name.
5205 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5206 128-bit long double format.
5208 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5209 IBM1161, and IBM1162 charsets.
5211 * Andreas Jaeger contributed a port to x86-64/Linux.
5213 * Peter Bruin contributed a port to PowerPC/Hurd.
5215 * libc functions using I/O streams now can handle wide-oriented streams
5218 * optimizations in the dynamic linker. Binaries created by recent binutils
5219 versions start up quicker due to reduced time spent on relocations.
5221 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5225 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5226 asinh, atanh, j0 for the 128-bit long double format.
5228 * Bruno Haible updated all the code handling Unicode in some form to
5229 support Unicode 3.1.
5231 * Speed of regex for single-byte locales is back to previous levels.
5232 Patch by Isamu Hasegawa.
5234 * Alpha, SPARC, and IA-64 now also using floating stacks.
5236 * Startup time of internationalized applications greatly improved through
5237 iconv cache. Use iconvconfig to generate the cache file.
5238 Contributed by Ulrich Drepper.
5240 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5241 severe performance problems. Patch by David Mosberger.
5243 * The Hurd port got a lot more functionality like AIO, various stdio
5244 extensions, etc. Mainly done by Roland McGrath.
5246 * mtrace can now lookup symbols in shared libraries.
5250 * Intel's IA-64 math library is largely integrated. It provides fast and
5251 accurate implementatations for most basic and standard math functions
5252 in float, double, and long double format.
5254 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5255 and asin for the 96-bit long double format and asin, log, tan for the
5256 128-bit long double format.
5258 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5259 The basic double functions exist today. Contributed by Abraham Ziv
5260 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5261 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5263 * An asynchronous name lookup library was added. The interface is designed
5264 after POSIX AIO. The proposal was circulated beforehand to get comments.
5265 No negative ones came in. Implemented by Ulrich Drepper.
5267 * Port to S390/64bit contributed by Martin Schwidefsky
5268 <schwidefsky@de.ibm.com>.
5270 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5271 of functions for Linux/IA-64.
5273 * The RPC code is now thread safe. Threads can now use the same service
5274 of different services at the same time. Patch by Eric Norum
5275 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5277 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5278 family of functions for Linux/S390.
5280 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5281 of functions for Linux/x86.
5283 * Port to Linux/CRIS contributed by Axis Communications.
5287 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5288 we can now check for namespace violations and missing declarations. The
5289 result is that almost all headers are now Unix-compliant (as defined in
5290 the upcoming XPG6). The negative side is that some programs might need
5291 corrections, too, if they depend on the incorrect form of the headers in
5292 previous versions which defined too many symbols and included too many
5295 * regex now handles multibyte character sets correctly.
5296 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5298 * iconv (the program) does now conform to the upcoming XPG6 and handles
5299 charmaps. Instead of the charset names the path of charmaps can be
5300 provided and the conversion happens based on this data.
5301 Contributed by Ulrich Drepper.
5303 * The locale program now provides detailed information about the installed
5308 only lists the names of the supported locales
5312 provides details such as country, language, and codeset name.
5313 Contributed by Ulrich Drepper.
5317 * The gencat program now parses the input file according to the charset
5318 selected by the LC_CTYPE category. This is important for stateful
5319 character sets. To make generating catalogs easier there is a way
5320 to overwrite the charset selected by the locale: before the first
5321 message or $ quote line the catalog can contain a line like
5323 $ codeset=ISO-8859-2
5325 to select the charset (ISO-8859-2 in this case).
5327 Implemented by Shinya Hanataka and Ulrich Drepper.
5329 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5330 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5331 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5333 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5334 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5336 * The LANGUAGE environment variable is now ignored unless the locale is
5337 changed from the default "C" locale.
5339 * The usual bug fixes.
5343 * Greg McGary added runtime support for bounds checking using gcc's
5344 new -fbounded-pointers option. ix86 target is complete. PowerPC
5347 * Thorsten Kukuk added secure mode support to nscd.
5349 * The Berkeley db libraries have been removed.
5351 Related, the nss_db module is now in a separate package since it
5352 obviously requires a database library being available.
5354 * Wide character I/O streams implemented by Ulrich Drepper.
5356 * Functions from the extended socket API added by Ulrich Drepper.
5358 * Functions feenableexcept and fedisableexcept to control the
5359 behaviour of individual exceptions have been added by Andreas Jaeger.
5361 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5363 * The resolver code has been updated from bind 8.2.3-T5B which supports
5364 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5367 This change could in some situations effect backward compatibility. Since
5368 now `_res' is a thread-local instead of a global variable, modifying it
5369 in one thread does not have any effect in other threads.
5371 The resolver library was also extended to allow IPv6 as the transport
5372 protocol for the requests. This work was done by Stig Venaas.
5374 * Compatibility code for K&R C compilers has been removed from the
5375 header files. A ISO C compiler is needed to use the library
5376 (conforming to either C89 or C99 standard).
5378 * Complete rewrite of the localedef program to support multibyte character
5379 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5380 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5381 Implemented by Ulrich Drepper.
5383 Bruno Haible significantly improved the generation and use of the data
5384 structures for the wide character tables.
5386 * Plural handling in gettext implemented by Ulrich Drepper.
5388 * The utmp daemon has been removed.
5390 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5392 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5395 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5397 * POSIX barriers implemented by Kaz Kylheku.
5399 * POSIX spawn function family implemented by Ulrich Drepper.
5401 * POSIX spinlocks are now available.
5403 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5405 * the configure option --enable-kernel=X.Y.Z allows to strip out
5406 compatibility for kernel versions before X.Y.Z. This is currently only
5407 implemented for Linux.
5409 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5410 field sin6_scope_id. This means that all programs using IPv6 should be
5411 recompiled. Don't expect binary compatibility with previous glibc
5414 * various conversion modules for IBM character sets contributed by
5417 * IA-64 port by Jes Sorensen and HJ Lu.
5431 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5433 * New xdr functions are added; some rpc functions are now 64bit clean.
5435 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5437 * Fixed known incompatibilities with glibc 2.0.
5439 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5441 * Optimized a number of functions (especially the ELF dynamic loader).
5443 * Update timezone data files.
5445 * lots of charmaps corrections
5447 * some new locale definitions and charmaps
5452 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5453 conform to POSIX member type requirements. Symbol versions have been
5454 adjusted as needed within the library, and for direct use by applications,
5455 but there is potential for problems if third-party libraries use
5456 struct timeval as part of their interface. This does not present
5457 a problem for X and other "essential" system libraries.
5459 * An additional locale model to support C++ Standard Library locale
5460 model and probably more was implemented by Ulrich Drepper.
5462 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5465 * Miles Bader provided the `argp' function family to support hierachical
5466 command line argument parsing, layered on top of getopt.
5468 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5470 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5473 * scanf recognizes the %a and %A format for scanning floating point numbers.
5475 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5476 information and interfaces for the available integer types.
5478 * about 130 new math functions were added to implement the ISO C9x math
5481 * the new header <complex.h> contains definitions of the complex math
5482 functions from ISO C 9X.
5484 * the new header <tgmath.h> defines generic macros to use complex or
5485 real valued functions.
5487 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5489 * Andreas Jaeger provided a test suite for the math library.
5491 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5493 * Ulrich Drepper added character set conversion functions (iconv).
5495 * Optimized string functions have been added.
5497 * The localedata addon is now part of glibc.
5499 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5501 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5502 daemon for NSS (nscd).
5504 Missing a better place here are some numbers on improvements. Under
5505 Linux 2.1.125 un-tar-ing the kernel sources takes
5509 using local files 12.19s 6.88s 22.91s
5511 using NIS 13.92s 8.91s 26.34s
5513 using NIS & nscd 10.37s 7.34s 25.30s
5515 using NIS+ 27.57s 30.37s 640.46s
5517 using NIS+ & nscd 10.25s 7.83s 26.51s
5519 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5521 Keep in mind that non-namelookup related operations dominate above times.
5522 It was just a common complain that using NIS+ unpacking the kernel is
5525 [1] The old nscd implementation is not available anymore since it was
5526 distributed with glibc up to version 2.0.98 and thus is now replaced.
5528 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5530 * Mark Kettenis provided a Hesiod NSS module.
5532 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5533 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5535 * rcmd can now handle netgroups (Dick Streefland).
5537 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5540 * Support for the IPv6 protocol has been added to the socket API, as per the
5541 latest draft standards.
5543 * Support for Linux 2.2 has been added.
5545 * Interface changes relative to the latest 2.0.x release:
5546 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5547 addseverity NEW: Unix98
5548 alphasort64 NEW: LFS
5549 argp_err_exit_status NEW: argp, GNU ext
5550 argp_error NEW: argp, GNU ext
5551 argp_failure NEW: argp, GNU ext
5552 argp_help NEW: argp, GNU ext
5553 argp_parse NEW: argp, GNU ext
5554 argp_program_bug_address NEW: argp, GNU ext
5555 argp_program_version NEW: argp, GNU ext
5556 argp_program_version_hook NEW: argp, GNU ext
5557 argp_state_help NEW: argp, GNU ext
5558 argp_usage NEW: argp, GNU ext
5559 authdes_create NEW: Secure RPC
5560 authdes_getucred NEW: Secure RPC
5561 authdes_pk_create NEW: Secure RPC
5562 backtrace NEW: GNU ext.
5563 backtrace_symbols NEW: GNU ext.
5564 backtrace_symbols_fd NEW: GNU ext.
5566 cacosf NEW: ISO C 9x
5567 cacosh NEW: ISO C 9x
5568 cacoshf NEW: ISO C 9x
5569 cacoshl NEW: ISO C 9x
5570 cacosl NEW: ISO C 9x
5577 casinf NEW: ISO C 9x
5578 casinh NEW: ISO C 9x
5579 casinhf NEW: ISO C 9x
5580 casinhl NEW: ISO C 9x
5581 casinl NEW: ISO C 9x
5583 catanf NEW: ISO C 9x
5584 catanh NEW: ISO C 9x
5585 catanhf NEW: ISO C 9x
5586 catanhl NEW: ISO C 9x
5587 catanl NEW: ISO C 9x
5588 cbc_crypt NEW: Secure RPC
5592 ccoshf NEW: ISO C 9x
5593 ccoshl NEW: ISO C 9x
5599 cimagf NEW: ISO C 9x
5600 cimagl NEW: ISO C 9x
5601 clearerr_locked REMOVED
5602 clntunix_create NEW: sunrpc ext
5604 clog10 NEW: ISO C 9x
5605 clog10f NEW: ISO C 9x
5606 clog10l NEW: ISO C 9x
5616 cprojf NEW: ISO C 9x
5617 cprojl NEW: ISO C 9x
5619 crealf NEW: ISO C 9x
5620 creall NEW: ISO C 9x
5625 csinhf NEW: ISO C 9x
5626 csinhl NEW: ISO C 9x
5629 csqrtf NEW: ISO C 9x
5630 csqrtl NEW: ISO C 9x
5634 ctanhf NEW: ISO C 9x
5635 ctanhl NEW: ISO C 9x
5637 des_setparity NEW: Secure RPC
5638 ecb_crypt NEW: Secure RPC
5639 endutxent NEW: Unix98
5641 exp10f NEW: ISO C 9x
5642 exp10l NEW: ISO C 9x
5646 fattach NEW: STREAMS
5647 fdetach NEW: STREAMS
5651 feclearexcept NEW: ISO C 9x
5652 fegetenv NEW: ISO C 9x
5653 fegetexceptflag NEW: ISO C 9x
5654 fegetround NEW: ISO C 9x
5655 feholdexcept NEW: ISO C 9x
5657 feraiseexcept NEW: ISO C 9x
5658 ferror_locked REMOVED
5659 fesetenv NEW: ISO C 9x
5660 fesetexceptflag NEW: ISO C 9x
5661 fesetround NEW: ISO C 9x
5662 fetestexcept NEW: ISO C 9x
5663 feupdateenv NEW: ISO C 9x
5664 fflush_locked REMOVED
5668 fgets_unlocked NEW: GNU ext.
5669 fileno_locked REMOVED
5681 fputc_locked REMOVED
5682 fputs_unlocked NEW: GNU ext.
5683 fread_unlocked NEW: GNU ext.
5688 fstatvfs NEW: Unix98
5692 ftruncate64 NEW: LFS
5694 fwrite_unlocked NEW: GNU ext.
5695 gai_strerror NEW: IPv6
5699 getchar_locked REMOVED
5701 getdate_err NEW: Unix98
5702 getdate_r NEW: GNU ext.
5704 getnameinfo NEW: IPv6
5705 getnetname NEW: Secure RPC
5706 getpmsg NEW: STREAMS
5707 getpt NEW: Unix98 PTY
5708 getrlimit64 NEW: LFS
5709 getutxent NEW: Unix98
5710 getutxid NEW: Unix98
5711 getutxline NEW: Unix98
5712 glob64 NEW: GNU ext.
5713 globfree64 NEW: GNU ext.
5714 gnu_get_libc_release NEW: GNU ext.
5715 gnu_get_libc_version NEW: GNU ext.
5716 grantpt NEW: Unix98 PTY
5717 host2netname NEW: Secure RPC
5719 iconv_close NEW: iconv
5720 iconv_open NEW: iconv
5721 if_freenameindex NEW: IPv6
5722 if_indextoname NEW: IPv6
5723 if_nameindex NEW: IPv6
5724 if_nametoindex NEW: IPv6
5725 in6addr_any NEW: IPv6
5726 in6addr_loopback NEW: IPv6
5727 inet6_isipv4mapped NEW: IPv6
5728 isastream NEW: STREAMS
5729 iswblank NEW: GNU ext.
5730 key_decryptsession NEW: Secure RPC
5731 key_decryptsession_pk NEW: Secure RPC
5732 key_encryptsession NEW: Secure RPC
5733 key_encryptsession_pk NEW: Secure RPC
5734 key_gendes NEW: Secure RPC
5735 key_get_conv NEW: Secure RPC
5736 key_secretkey_is_set NEW: Secure RPC
5737 key_setnet NEW: Secure RPC
5738 key_setsecret NEW: Secure RPC
5739 llrint NEW: ISO C 9x
5740 llrintf NEW: ISO C 9x
5741 llrintl NEW: ISO C 9x
5742 llround NEW: ISO C 9x
5743 llroundf NEW: ISO C 9x
5744 llroundl NEW: ISO C 9x
5749 lrintf NEW: ISO C 9x
5750 lrintl NEW: ISO C 9x
5751 lround NEW: ISO C 9x
5752 lroundf NEW: ISO C 9x
5753 lroundl NEW: ISO C 9x
5755 makecontext NEW: Unix98
5756 mempcpy NEW: GNU ext.
5759 modify_ldt NEW: kernel
5763 nearbyint NEW: ISO C 9x
5764 nearbyintf NEW: ISO C 9x
5765 nearbyintl NEW: ISO C 9x
5766 netname2host NEW: Secure RPC
5767 netname2user NEW: Secure RPC
5768 nexttoward NEW: ISO C 9x
5769 nexttowardf NEW: ISO C 9x
5770 nexttowardl NEW: ISO C 9x
5774 passwd2des NEW: Secure RPC
5776 pow10f NEW: GNU ext.
5777 pow10l NEW: GNU ext.
5780 printf_size NEW: GNU ext.
5781 printf_size_info NEW: GNU ext.
5782 profil_counter REMOVED
5783 pthread_mutexattr_getkind_np REPLACED
5784 pthread_mutexattr_setkind_np REPLACED
5785 ptsname NEW: Unix98 PTY
5786 ptsname_r NEW: Unix98 PTY
5788 putchar_locked REMOVED
5789 putgrent NEW: GNU ext.
5791 putpmsg NEW: STREAMS
5792 pututxline NEW: Unix98
5796 readdir64_r NEW: LFS
5797 remquo NEW: ISO C 9x
5798 remquof NEW: ISO C 9x
5799 remquol NEW: ISO C 9x
5801 roundf NEW: ISO C 9x
5802 roundl NEW: ISO C 9x
5804 scalbln NEW: ISO C 9x
5805 scalblnf NEW: ISO C 9x
5806 scalblnl NEW: ISO C 9x
5808 sendfile NEW: kernel
5809 setcontext NEW: Unix98
5810 setrlimit64 NEW: LFS
5811 setutxent NEW: Unix98
5813 sigignore NEW: Unix98
5814 sigqueue NEW: POSIX.1b
5815 sigrelse NEW: Unix98
5816 sigset NEW: POSIX.1b
5817 sigtimedwait NEW: POSIX.1b
5818 sigwaitinfo NEW: POSIX.1b
5819 sincos NEW: GNU ext.
5820 sincosf NEW: GNU ext.
5821 sincosl NEW: GNU ext.
5825 strcasestr NEW: GNU ext.
5826 strtoimax NEW: ISO C 9x
5827 strtoumax NEW: ISO C 9x
5828 strverscmp NEW: GNU ext.
5829 svcauthdes_stats NEW: Secure RPC
5830 svcunix_create NEW: sunrpc etx
5831 svcunixfd_create NEW: sunrpc ext
5832 swapcontext NEW: Unix98
5833 tcgetsid NEW: Unix98 PTY
5834 tdestroy NEW: GNU ext.
5835 tgamma NEW: ISO C 9x
5836 tgammaf NEW: ISO C 9x
5837 tgammal NEW: ISO C 9x
5841 truncf NEW: ISO C 9x
5842 truncl NEW: ISO C 9x
5844 unlockpt NEW: Unix98 PTY
5845 updwtmpx NEW: Unix98
5846 user2netname NEW: Secure RPC
5847 utmpxname NEW: Unix98
5848 versionsort NEW: GNU ext.
5849 versionsort64 NEW: GNU ext.
5851 wcscasecmp NEW: GNU ext.
5852 wcsncasecmp NEW: GNU ext.
5853 wcsnlen NEW: GNU ext.
5854 wcstoimax NEW: ISO C 9x
5855 wcstoll NEW: ISO C 9x
5856 wcstoull NEW: ISO C 9x
5857 wcstoumax NEW: ISO C 9x
5859 wordexp NEW: POSIX.2
5860 wordfree NEW: POSIX.2
5861 write_profiling REMOVED
5862 xdecrypt NEW: Secure RPC
5863 xdr_authdes_cred NEW: Secure RPC
5864 xdr_authdes_verf NEW: Secure RPC
5865 xdr_cryptkeyarg NEW: Secure RPC
5866 xdr_cryptkeyarg2 NEW: Secure RPC
5867 xdr_cryptkeyres NEW: Secure RPC
5868 xdr_getcredres NEW: Secure RPC
5869 xdr_key_netstarg NEW: Secure RPC
5870 xdr_key_netstres NEW: Secure RPC
5871 xdr_keybuf NEW: Secure RPC
5872 xdr_keystatus NEW: Secure RPC
5873 xdr_netnamestr NEW: Secure RPC
5874 xdr_sizeof NEW: Secure RPC
5875 xdr_unixcred NEW: sunrpc ext
5876 xencrypt NEW: Secure RPC
5877 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5888 * inet_ntoa is thread-safe
5890 * updwtmp is moved from libutil to libc
5892 * rewrite of cbrt function
5894 * update of timezone data
5908 * add atoll function
5910 * fix complex problems in Berkeley DB code
5912 * fix math functions
5916 * fixed lots of header problems (especially Linux/GNU specific)
5918 * dynamic loader preserves all registers
5920 * Roland McGrath provided support for handling of auxiliary objects in
5921 the ELF dynamic loader.
5923 * support for parallel builds is improved
5927 * GNU extensions are no longer declared by default. To enable them you
5928 must define the macro `_GNU_SOURCE' in your program or compile with
5931 * The library has changed from using GNU ld symbol aliases to using weak
5932 symbols where available. The ELF object file format supports weak
5933 symbols; GNU ld also supports weak symbols in the a.out format. (There
5934 is also now support for other GNU ld extensions in ELF. Use the
5935 `--with-elf' option to configure to indicate you have ELF, and
5936 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5937 of many files which contained only symbol aliases, reducing the size of
5938 the source and the compiled library; many other files were renamed to
5939 less cryptic names previously occupied by the symbol alias files.
5940 There is a new header file <elf.h> for programs which operate on
5941 files in the ELF format.
5943 * Converted to Autoconf version 2, so `configure' has more options.
5944 Run `configure --help' to see the details.
5946 * The library can now be configured to build profiling, highly-optimized
5947 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5948 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5949 `configure' enable building these extra libraries. The shared library is
5950 built by default when using both ELF and GNU ld. When shared libraries
5951 are enabled, the new library `-ldl' is available for arbitrary run-time
5952 loading of shared objects; its interface is defined in <dlfcn.h>. The
5953 new header file <link.h> gives access to the internals of the run-time
5954 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5955 application of same name on other systems and it provides information
5956 about dynamically linked binaries.
5958 * The C library now provides the run-time support code for profiling
5959 executables compiled with `-pg'. Programs can control the profiling code
5960 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5961 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5962 the support for this file format was contributed by David Mosberger-Tang.
5964 * The math code has been replaced with a math library based on fdlibm from
5965 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5966 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5967 functions. The math functions now reside in a separate library, so
5968 programs using them will need to use `-lm' their linking commands.
5970 * John C. Bowman contributed optimized ix87 assembler inline functions.
5972 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5973 mechanism similar to that found in Solaris 2. This is now used for the
5974 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5975 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5976 file controls what services are used for each individual database. This
5977 works by loading shared libraries with names specified in `nsswitch.conf',
5978 so service modules can be changed or added at any time without even
5979 relinking any program. Currently there are the file, db, and NIS based
5980 NSS services available.
5982 * The new functions `strtoq' and `strtouq' parse integer values from
5983 strings, like `strtol' and `strtoul', but they return `long long int' and
5984 `unsigned long long int' values, respectively (64-bit quantities).
5986 * The new functions `strtof' and `strtold' parse floating-point values from
5987 strings, like `strtod', but they return `float' and `long double' values,
5988 respectively (on some machines `double' and `long double' are the same).
5990 * Ulrich Drepper has contributed new implementations of the floating-point
5991 printing and reading code used in the `printf' family of functions and
5992 `strtod', `strtof', and `strtold'. These new functions are perfectly
5993 accurate, and much faster than the old ones.
5995 * The implementation of the POSIX locale model was completely rewritten by
5996 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5997 to compile the POSIX locale definition.
5999 * The former dummy implementations of the strcoll and strxfrm function are
6000 now replaced by fully functional code contributed by Ulrich Drepper. The
6001 collation information comes from the POSIX locale definitions.
6003 * The new header <langinfo.h> defines an interface for accessing
6004 various locale-dependent data (using the locale chosen with `setlocale').
6006 * Ulrich Drepper has contributed a new suite of functions for operation on
6007 wide-character and multibyte-character strings, in <wchar.h>;
6008 and classification and case conversion of wide characters, in <wctype.h>.
6009 These new functions are conforming to the ISO C, Amendement 1 specification.
6011 * There is now a second implementation of the standard I/O library available.
6012 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6013 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6015 * You can now use positional parameter specifications in format strings
6016 for the `printf' and `scanf' families of functions. For example,
6017 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6018 ``Number 6, Mr Jones''. This is mainly useful when providing different
6019 format strings for different languages, whose grammars may dictate
6020 different orderings of the values being printed. To support this
6021 feature, the interface for `register_printf_handler' has changed; see
6022 the header file <printf.h> for details.
6024 * The `printf' and `scanf' families of functions now understand a new
6025 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6026 to group numbers as indicated by the locale; for `scanf' and friends, this
6027 says to accept as valid only a number with all the proper grouping
6028 separators in the right places. In the default "C" locale, numbers are
6029 not grouped; but locales for specific countries will define the usual
6030 conventions (i.e. separate thousands with `,' in the US locale).
6032 * The pgrp functions have been regularized, slightly incompatibly but much
6033 less confusingly. The core functions are now `getpgid' and `setpgid',
6034 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6035 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6036 provided for compatibility. There is no longer an incompatible `getpgrp'
6037 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6039 * The new header file <fts.h> and suite of functions simplify programs that
6040 operate on directory trees. This code comes from 4.4 BSD.
6042 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6043 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6044 NSS scheme used in glibc.
6046 * There is a new malloc debugging hook `__memalign_hook'.
6048 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6049 `unsigned int' in <sys/types.h>. These are for compatibility only and
6050 their use is discouraged.
6052 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6053 done differently, so that it works even without GNU ld.
6055 * New function `euidaccess' checks allowed access to a file like `access',
6056 but using the effective IDs instead of the real IDs.
6058 * The time zone data files have been updated for the latest and greatest
6059 local time conventions of the countries of the world.
6061 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6064 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6065 for formatting floating-point numbers. They are provided only for
6066 compatibility; new programs should use `sprintf' instead. There are
6067 also equivalent function for the `long double' floating-point type and
6068 all functions also exist in a reentrant form.
6070 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6071 functions for maintaining the login-record files (primarily of use to
6072 system programs such as `login'), and convenient functions for
6073 allocating and initializing a pseudo-terminal (pty) device.
6075 * Ulrich Drepper has contributed new support for System V style
6076 shared memory and IPC on systems that support it.
6078 * Ulrich Drepper has contributed several miscellaneous new functions found
6079 in System V: The `hsearch' family of functions provide an effective
6080 implementation of hash tables; `a64l' and `l64a' provide a very simple
6081 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6084 * Ulrich Drepper has contributed new reentrant counterparts for the
6085 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6087 * Ulrich Drepper has contributed new, highly-optimized versions of several
6088 string functions for the i486/Pentium family of processors.
6090 * Ulrich Drepper has updated the Linux-specific code, based largely
6091 on work done in Hongjiu Lu's version of GNU libc for Linux.
6092 The GNU library now supports Linux versions 2.0.10 and later,
6093 using the ELF object file format (i[3456]86-*-linux).
6095 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6097 * David Mosberger-Tang and Richard Henderson have ported the C library
6098 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6099 dynamic linking support for ELF/Alpha.
6101 * Richard Henderson contributed several Alpha optimized assembler function
6102 for arithmetic and string handling.
6104 * Ulrich Drepper has contributed a new set of message catalog functions to
6105 support multiple languages using the <libintl.h> interface, for use with
6106 his new package GNU gettext. Translation volunteers have contributed
6107 catalogs of the library's messages in Spanish, German, and Korean.
6109 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6110 program and the `catgets' function for reading the catalog files it
6111 creates. (The <libintl.h> interface is preferred; we include the
6112 <nl_types.h> interface using `catgets' only for source compatibility with
6113 programs already written to use it.)
6115 * New header file <values.h> gives SVID-compatible names for <limits.h>
6118 * Various new macros, declarations, and small header files for compatibility
6121 * New function `group_member' is a convenient way to check if a process has
6122 a given effective group ID.
6124 * When using GCC 2.7 and later, the socket functions are now declared in a
6125 special way so that passing an argument of type `struct sockaddr_in *',
6126 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6127 `struct sockaddr *' type, does not generate a type-clash warning.
6129 * New function `error' declared in header file <error.h> is a convenient
6130 function for printing error messages and optionally exiting; this is the
6131 canonical function used in GNU programs. The new functions `err', `warn',
6132 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6133 doing the same thing.
6135 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6136 POSIX.2 `glob' function to do ~ and {...} expansion.
6138 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6139 `clearenv' which is used in POSIX.9 is also available.
6141 * New function `getsid' returns session ID number on systems that support it.
6143 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6144 files <db.h> and <mpool.h> provide a rich set of functions for several
6145 types of simple databases stored in memory and in files, and <ndbm.h> is
6146 an old `ndbm'-compatible interface using the `db' functions. Link with
6147 `-ldb' to get these functions.
6149 * New macro `strdupa' copies a string like `strdup', but uses local stack
6150 space from `alloca' instead of dynamic heap space from `malloc'.
6152 * New function `strnlen' is like `strlen' but searches only a given maximum
6153 number of characters for the null terminator. `stpncpy', `strndup' and
6154 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6157 * New function `statfs' in header <sys/statfs.h>.
6159 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6160 provide convenient functions for operating on blocks of null-terminated
6163 * A new suite of functions in <utmp.h> handle all the details of reading
6164 and writing the utmp file.
6166 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6169 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6170 completely POSIX compliant and also implemented the extended functionality
6171 to handle alternate digit representation and alternate era date formats.
6173 * Ulrich Drepper provided an implementation of the `strptime' function
6174 defined in XPG4.2 which transforms a string into a `struct tm' value.
6176 * Paul Eggert provided the tzselect shell script as part of the timezone
6177 code. The shell script makes it easy to select the correct timezone
6180 * The implementation of the malloc family of functions is completely replaced
6181 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6182 The implementation uses the mmap function (if available) and it is
6183 optimized for the use in multi threaded programs.
6185 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6186 functions. This new functionality is usable by specifying a special
6187 salt string and it is compatible with implementation on *BSD systems.
6189 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6190 `getsubopt' to handle second level command line options, `bsd_signal'
6191 to access BSD style `signal' functionality, the obsolete `regexp' style
6194 * the `lchown' function is available on system which support this
6197 * The implementation of the shadow password handling function was contributed
6200 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6202 * POSIX.1g support was added. The <sys/select.h> header is available,
6203 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6204 implementation of `getaddrinfo'.
6208 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6210 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6211 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6213 * The new function `daemon' from 4.4 BSD is useful for server programs that
6214 want to put themselves in the background.
6216 * Joel Sherrill has contributed support for several standalone boards that
6217 run without an operating system.
6219 * `printf', `scanf' and friends now accept a `q' type modifier for long
6220 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6222 * All of the code taken from BSD (notably most of the math and networking
6223 routines) has been updated from the BSD 4.4-Lite release.
6225 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6227 * The new functions `getdomainname' and `setdomainname' fetch or change the
6228 YP/NIS domain name. These are system calls which exist on systems which
6231 * The time zone data files have been updated for the latest international
6234 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6235 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6239 * The C library now includes support for Sun RPC, from Sun's free
6240 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6241 are included. (There is still no support for YP.)
6243 * Tom Quinn has contributed a port of the C library to SGI machines running
6244 Irix 4 (mips-sgi-irix4).
6246 * The new `lockf' function is a simplified interface to the locking
6247 facilities of `fcntl', included for compatibility.
6249 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6251 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6253 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6256 * The error message printed by `assert' for a failed assertion now includes
6257 the name of the program (if using GNU ld) and the name of the calling
6258 function (with versions of GCC that support this).
6260 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6262 * The library now includes the <sys/mman.h> header file and memory
6263 management functions `mmap', `munmap', `mprotect', `msync', and
6264 `madvise', on systems that support those facilities.
6266 * The interface for `mcheck' has changed slightly: the function called to
6267 abort the program when an allocation inconsistency is detected now takes
6268 an argument that indicates the type of failure. The new function
6269 `mprobe' lets you request a consistency check for a particular block at
6270 any time (checks are normally done only when you call `free' or `realloc'
6273 * It is now possible to easily cross-compile the C library, building on one
6274 system a library to run on another machine and/or operating system. All
6275 you need to do is set the variable `HOST_CC' in `configparms' to the
6276 native compiler for programs to run on the machine you are building on (a
6277 few generator programs are used on Unix systems); set `CC' to the
6280 * The new function `fexecve' (only implemented on the GNU system) executes
6281 a program file given a file descriptor already open on the file.
6285 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6286 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6288 * You can set the variable `libprefix' in `configparms' to specify a prefix
6289 to be prepended to installed library files; this makes it easy to install
6290 the GNU C library to be linked as `-lgnuc' or whatever.
6292 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6293 copies a limited number of characters from a string, and returns the
6294 address of the last character written.
6296 * You no longer need to check for whether the installed `stddef.h' is
6297 compatible with the GNU C library. configure now checks for you.
6299 * You can now define a per-stream `fileno' function to convert the
6300 stream's cookie into an integral file descriptor.
6302 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6303 allocates zero bytes of storage, and returns a unique pointer which
6304 you can pass to `realloc' or `free'. The behavior is undefined if
6305 you dereference this pointer.
6307 * The C library now runs on Sony NEWS m68k machines running either
6308 NewsOS 3 or NewsOS 4.
6310 * The new `syscall' function is a system-dependent primitive function
6311 for invoking system calls. It has the canonical behavior on Unix
6312 systems, including unreliable return values for some calls (such as
6313 `pipe', `fork' and `getppid').
6315 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6316 to `EAGAIN', which is the preferred name. On systems whose kernels
6317 use two distinct codes, the C library now translates EWOULDBLOCK to
6318 EAGAIN in every system call function.
6322 * The GNU C Library Reference Manual is now distributed with the library.
6323 `make dvi' will produce a DVI file of the printed manual.
6324 `make info' will produce Info files that you can read on line using C-h i
6325 in Emacs or the `info' program.
6326 Please send comments on the manual to bug-glibc-manual@gnu.org.
6328 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6330 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6332 * Jason Merrill has contributed a port to the Sequent Symmetry running
6333 Dynix version 3 (i386-sequent-dynix).
6335 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6336 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6338 * New function `memory_warnings' lets you arrange to get warnings when
6339 malloc is running out of memory to allocate, like Emacs gives you.
6341 * The C library now contains the relocating allocator used in Emacs 19 for
6342 its editing buffers. This allocator (ralloc) minimizes allocation
6343 overhead and fragmentation by moving allocated regions around whenever it
6344 needs to. You always refer to a ralloc'd region with a "handle" (a
6345 pointer to a pointer--an object of type `void **').
6347 * There is a new `printf' format: `%m' gives you the string corresponding
6348 to the error code in `errno'.
6350 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6351 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6352 pass, the `a' modifier says to fill in a `char **' you pass with a
6355 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6356 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6357 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6359 * `mkstemp' is a traditional Unix function to atomically create and open a
6360 uniquely-named temporary file.
6364 * The standard location for the file that says what the local timezone is
6365 has changed again. It is now `/usr/local/etc/localtime' (or more
6366 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6368 * The distribution no longer contains any files with names longer than 14
6371 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6372 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6374 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6378 * The configuration process has changed quite a bit. The `configure'
6379 script is now used just like the configuration scripts for other GNU
6380 packages. The `sysdeps' directory hierarchy is much rearranged.
6381 The file `INSTALL' explains the new scheme in detail.
6383 * The header files no longer need to be processed into ANSI C and
6384 traditional C versions. There is just one set of files to install, and
6385 it will work with ANSI or old C compilers (including `gcc -traditional').
6387 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6388 MIPS DECStation running Ultrix 4.
6390 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6391 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6392 made itself into a shared library.
6394 * Yet further improved support for the i386, running 4.3 BSD-like systems
6395 (such as Mach 3 with the Unix single-server), or System V.
6397 * New function `strncasecmp' to do case-insensitive string comparison
6398 with limited length.
6400 * New function `strsep' is a reentrant alternative to `strtok'.
6402 * New functions `scandir' and `alphasort' for searching directories.
6404 * New function `setenv' is a better interface to `putenv'.
6406 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6407 function for traversing a directory tree.
6409 * The GNU obstack package is now also part of the C library.
6410 The new function `open_obstack_stream' creates a stdio stream that
6411 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6412 formatted output directly to an obstack.
6414 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6415 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6417 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6419 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6420 things to your strings.
6422 * There are some new test programs: test-fseek, testmb, and testrand.
6424 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6425 These ports are not finished, but are a good starting place for really
6426 supporting those systems.
6428 * `/etc/localtime' is now the standard location for the file that says what
6429 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6430 This follows the general principle that `/etc' is the place for all local
6431 configuration files.
6433 * The C library header files now use `extern "C"' when used by the C++
6434 compiler, so the C library should now work with C++ code.
6436 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6437 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6440 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6441 function which uses the `merge sort' algorithm, and is said to be
6442 significantly faster than the old GNU `qsort' function. Merge sort is
6443 now the standard `qsort' function. The new algorithm can require a lot
6444 of temporary storage; so, the old sorting function is called when the
6445 required storage is not available.
6447 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6448 provides the Unix `crypt' function, plus some other entry points.
6450 * The code and header files taken from 4.4 BSD have been updated with the
6451 latest files released from Berkeley.
6453 ----------------------------------------------------------------------
6456 Permission is granted to anyone to make or distribute verbatim copies
6457 of this document as received, in any medium, provided that the
6458 copyright notice and this permission notice are preserved,
6459 thus giving the recipient permission to redistribute in turn.
6461 Permission is granted to distribute modified versions
6462 of this document, or of portions of it,
6463 under the above conditions, provided also that they
6464 carry prominent notices stating who last changed them.
6467 version-control: never