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 Deprecated and removed features, and other changes affecting compatibility:
23 * The function pthread_mutex_consistent_np has been deprecated; programs
24 should use the equivalent standard function pthread_mutex_consistent
27 * The function pthread_mutexattr_getrobust_np has been deprecated;
28 programs should use the equivalent standard function
29 pthread_mutexattr_getrobust instead.
31 * The function pthread_mutexattr_setrobust_np has been deprecated;
32 programs should use the equivalent standard function
33 pthread_mutexattr_setrobust instead.
35 * The function pthread_yield has been deprecated; programs should use
36 the equivalent standard function sched_yield instead.
38 Changes to build and runtime requirements:
40 * On Linux, the shm_open, sem_open, and related functions now expect the
41 file shared memory file system to be mounted at /dev/shm. These functions
42 no longer search among the system's mount points for a suitable
43 replacement if /dev/shm is not available.
45 Security related changes:
47 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
48 a request for netgroup lookup, may crash due to a double-free,
49 potentially resulting in degraded service or Denial of Service on the
50 local system. Reported by Chris Schanzle.
52 The following bugs are resolved with this release:
54 [The release manager will add the list generated by
55 scripts/list-fixed-bugs.py just before the release.]
62 * The dynamic linker accepts the --list-tunables argument which prints
63 all the supported tunables. This option is disable if glibc is
64 configured with tunables disabled (--enable-tunables=no).
66 * The dynamic linker accepts the --argv0 argument and provides opportunity
67 to change argv[0] string.
69 * The dynamic linker loads optimized implementations of shared objects
70 from subdirectories under the glibc-hwcaps directory on the library
71 search path if the system's capabilities meet the requirements for
72 that subdirectory. Initially supported subdirectories include
73 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
74 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
75 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
76 subdirectory names correspond to the vendor-independent x86-64
77 microarchitecture levels defined in the x86-64 psABI supplement.
79 * The new --help option of the dynamic linker provides usage and
80 information and library search path diagnostics.
82 * The mallinfo2 function is added to report statistics as per mallinfo,
83 but with larger field widths to accurately report values that are
84 larger than fit in an integer.
86 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
88 * Support for the RISC-V ISA running on Linux has been expanded to run on
89 32-bit hardware. This is supported for the following ISA and ABI pairs:
95 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
98 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
99 glibc may use additional checks that may have an additional performance
100 overhead. At present these checks are available only on LLVM 9 and later.
101 The latest GCC available at this time (10.2) does not support this level of
104 Deprecated and removed features, and other changes affecting compatibility:
106 * The mallinfo function is marked deprecated. Callers should call
109 * When dlopen is used in statically linked programs, alternative library
110 implementations from HWCAP subdirectories are no longer loaded.
111 Instead, the default implementation is used.
113 * The deprecated <sys/vtimes.h> header and the function vtimes have been
114 removed. To support old binaries, the vtimes function continues to exist
115 as a compatibility symbol. Applications should use the getrlimit or
118 * Following a change in the tzdata 2018a release upstream, the zdump
119 program is now installed in the /usr/bin subdirectory. Previously,
120 the /usr/sbin subdirectory was used.
122 * On s390(x), the type float_t is now derived from the macro
123 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
124 hardcoded to double. This does not affect the ABI of any libraries
125 that are part of the GNU C Library, but may affect the ABI of other
126 libraries that use this type in their interfaces. The new definition
127 improves consistency with compiler behavior in many scenarios.
129 * A future version of glibc will stop loading shared objects from the
130 "tls" subdirectories on the library search path, the subdirectory that
131 corresponds to the AT_PLATFORM system name, and also stop employing
132 the legacy AT_HWCAP search mechanism. Applications should switch to
133 the new glibc-hwcaps mechanism instead; if they do not do that, only
134 the baseline version (directly from the search path directory) will be
137 Changes to build and runtime requirements:
139 * On Linux, the system administrator needs to configure /dev/pts with
140 the intended access modes for pseudo-terminals. glibc no longer
141 attemps to adjust permissions of terminal devices. The previous glibc
142 defaults ("tty" group, user read/write and group write) already
143 corresponded to what most systems used, so that grantpt did not
144 perform any adjustments.
146 * On Linux, the posix_openpt and getpt functions no longer attempt to
147 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
148 (and pseudo-terminals are supported), a devpts file system is mounted
149 on /dev/pts. Current systems already meet these requirements.
151 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
153 Security related changes:
155 CVE-2021-3326: An assertion failure during conversion from the
156 ISO-20220-JP-3 character set using the iconv function has been fixed.
157 This assertion was triggered by certain valid inputs in which the
158 converted output contains a combined sequence of two wide characters
159 crossing a buffer boundary. Reported by Tavis Ormandy.
161 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
162 invoked with input containing redundant shift sequences in the IBM1364,
163 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
165 CVE-2020-29562: An assertion failure has been fixed in the iconv function
166 when invoked with UCS4 input containing an invalid character.
168 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
169 invoked with EUC-KR input containing invalid multibyte input sequences.
171 The following bugs are resolved with this release:
173 [10635] libc: realpath portability patches
174 [16124] dynamic-link: ld.so should allow to change argv[0]
175 [17924] malloc: 'free' should not set errno
176 [18683] libc: Linux faccessat implementation can incorrectly ignore
178 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
179 [23091] hurd: missing waitid support
180 [23249] libc: Epyc and other current AMD CPUs do not select the
181 "haswell" platform subdirectory
182 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
184 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
186 [24941] libc: Make grantpt usable after multi-threaded fork in more
188 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
189 [24973] locale: iconv encounters segmentation fault when converting
190 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
191 [25399] string: undefined reference to `__warn_memset_zero_len' when
192 changing gnuc version
193 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
195 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
197 [25971] libc: s390 bits/hwcap.h out of sync with kernel
198 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
199 [26100] libc: Race in syslog(3) with regards to tag printing.
200 [26124] libc: Export <cpu-features.h>
201 [26130] nscd: Inconsistent nscd cache during pruning
202 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
203 [26224] locale: iconv hangs when converting some invalid inputs from
204 several IBM character sets (CVE-2020-27618)
205 [26341] libc: realpath cyclically call __alloca(path_max) to consume
207 [26343] manual: invalid documented return type for strerrorname_np(),
208 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
209 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
211 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
213 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
214 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
216 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
217 [26553] libc: mtx_init allows type set to "mtx_recursive" only
218 [26555] string: strerrorname_np does not return the documented value
219 [26592] libc: pointer arithmetic overflows in realpath
220 [26600] network: Transaction ID collisions cause slow DNS lookups in
222 [26606] libc: [2.33 Regression] pselect is broken on x32
223 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
224 [26620] glob: fnmatch with collating symbols results in segmentation
226 [26625] libc: [2.33 Regression] CET is disabled
227 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
228 at the end of a memory mapping
229 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
230 by the caller to the kernel
231 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
232 [26647] build: [-Werror=array-parameter=] due to different
233 declarations for __sigsetjmp
234 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
236 [26649] stdio: printf should handle non-normal x86 long double numbers
237 gracefully (CVE-2020-29573)
238 [26686] build: -Warray-parameter instances building with GCC 11
239 [26687] build: -Warray-bounds instances building with GCC 11
240 [26690] stdio: Aliasing violation in __vfscanf_internal
241 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
242 [26726] build: GCC warning calling new_composite_name with an array of
244 [26736] libc: FAIL: misc/tst-sysvshm-linux
245 [26737] libc: Random FAIL: rt/tst-shm
246 [26791] libc: Missing O_CLOEXEC in sysconf.c
247 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
249 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
251 [26818] string: aarch64: string tests may run ifunc variants that are
253 [26821] libc: Memory leak test failures on Fedora 33
254 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
255 FSGSBASE/LM/RDRAND check failure
256 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
258 [26853] libc: aarch64: Missing unwind information in statically linked
260 [26923] locale: Assertion failure in iconv when converting invalid
261 UCS4 (CVE-2020-29562)
262 [26926] dynamic-link: aarch64: library dependencies are not bti
264 [26932] libc: sh: Multiple floating point functions defined as stubs
266 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
268 [26988] dynamic-link: aarch64: BTI mprotect address is not page
270 [27002] build: libc_freeres_fn build failure with GCC 11
271 [27004] dynamic-link: ld.so is miscompiled by GCC 11
272 [27008] dynamic-link: ld.so.cache should have endianness markup
273 [27042] libc: [alpha] anonymous union in struct stat confuses
275 [27053] libc: Conformance regression in system(3) (and probably also
277 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
279 [27077] network: Do not reload /etc/nsswitch.conf from chroot
280 [27083] libc: Unsafe unbounded alloca in addmntent
281 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
283 [27130] string: "rep movsb" performance issue
284 [27150] libc: alpha: wait4() is unavailable in static linking
285 [27177] dynamic-link:
286 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
288 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
289 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
290 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
291 related to combining characters (CVE-2021-3326)
298 * Unicode 13.0.0 Support: Character encoding, character type info, and
299 transliteration tables are all updated to Unicode 13.0.0, using
300 generator scripts contributed by Mike FABIAN (Red Hat).
302 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
304 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
305 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
306 Three ABIs are supported:
312 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
313 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
315 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
316 DT_DEPAUDIT dynamic section entries of the main executable.
318 * powerpc64le supports IEEE128 long double libm/libc redirects when
319 using -mabi=ieeelongdouble to compile C code on supported GCC
320 toolchains. It is recommended to use GCC 8 or newer when testing
323 * To help detect buffer overflows and other out-of-bounds accesses
324 several APIs have been annotated with GCC 'access' attribute. This
325 should help GCC 10 issue better warnings.
327 * On Linux, functions pthread_attr_setsigmask_np and
328 pthread_attr_getsigmask_np have been added. They allow applications
329 to specify the signal mask of a thread created with pthread_create.
331 * The GNU C Library now provides the header file <sys/single_threaded.h>
332 which declares the variable __libc_single_threaded. Applications are
333 encouraged to use this variable for single-thread optimizations,
334 instead of weak references to symbols historically defined in
337 * The functions sigabbrev_np and sigdescr_np have been added. The
338 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
339 SIGHUP) while sigdescr_np returns a string describing the signal number
340 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
341 attempt to translate the return description, both functions return
342 NULL for an invalid signal number.
344 They should be used instead of sys_siglist or sys_sigabbrev and they
345 are both thread and async-signal safe. These functions are GNU extensions.
347 * The functions strerrorname_np and strerrordesc_np have been added. The
348 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
349 while strerrordesc_np returns a string describing the error number
350 (e.g "Invalid argument" for EINVAL). Different than strerror,
351 strerrordesc_np does not attempt to translate the return description, both
352 functions return NULL for an invalid error number.
354 They should be used instead of sys_errlist and sys_nerr, both are
355 thread and async-signal safe. These functions are GNU extensions.
357 * AArch64 now supports standard branch protection security hardening
358 in glibc when it is built with a GCC that is configured with
359 --enable-standard-branch-protection (or if -mbranch-protection=standard
360 flag is passed when building both GCC target libraries and glibc,
361 in either case a custom GCC is needed). This includes branch target
362 identification (BTI) and pointer authentication for return addresses
363 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
364 extensions respectively for the protection to be effective,
365 otherwise the used instructions are nops. User code can use PAC-RET
366 without libc support, but BTI requires a libc that is built with BTI
367 support, otherwise runtime objects linked into user code will not be
370 Deprecated and removed features, and other changes affecting compatibility:
372 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
373 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
374 RPC header files. Backward compatibility for old programs is kept
375 only for architectures and ABIs that have been added in or before
376 glibc 2.31. New programs need to use TI-RPC
377 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
378 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
380 * Remove configure option --enable-obsolete-nsl. libnsl is only built
381 as shared library for backward compatibility and the NSS modules "nis"
382 and "nisplus" are not built at all and libnsl's headers aren't
383 installed. This compatibility is kept only for architectures and ABIs
384 that have been added in or before version 2.28. Replacement
385 implementations based on TI-RPC, which additionally support IPv6, are
386 available from <https://github.com/thkukuk/>. This change does not
387 affect the "compat" NSS module, which does not depend on libnsl
388 since 2.27 and thus can be used without NIS.
390 * The deprecated <sys/sysctl.h> header and the sysctl function have been
391 removed. To support old binaries, the sysctl function continues to
392 exist as a compatibility symbol (on those architectures which had it),
393 but always fails with ENOSYS. This reflects the removal of the system
394 call from all architectures, starting with Linux 5.5.
396 * The sstk function is no longer available to newly linked binaries.
397 Its implementation always returned with a failure, and the function
398 was not declared in any header file.
400 * The legacy signal handling functions siginterrupt, sigpause, sighold,
401 sigrelse, sigignore and sigset, and the sigmask macro have been
402 deprecated. Applications should use the sigsuspend, sigprocmask and
403 sigaction functions instead.
405 * ldconfig now defaults to the new format for ld.so.cache. glibc has
406 already supported this format for almost 20 years.
408 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
409 are no longer available to newly linked binaries, and their declarations
410 have been removed from <string.h>. They are exported solely as
411 compatibility symbols to support old binaries. All programs should use
414 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
415 are no longer available to newly linked binaries, and their declarations
416 have been removed from <stdio.h>. They are exported solely as
417 compatibility symbols to support old binaries. All programs should use
418 strerror or strerror_r instead.
420 * Both strerror and strerror_l now share the same internal buffer in the
421 calling thread, meaning that the returned string pointer may be invalided
422 or contents might be overwritten on subsequent calls in the same thread or
423 if the thread is terminated. It makes strerror MT-safe.
425 * Using weak references to libpthread functions such as pthread_create
426 or pthread_key_create to detect the singled-threaded nature of a
427 program is an obsolescent feature. Future versions of glibc will
428 define pthread_create within libc.so.6 itself, so such checks will
429 always flag the program as multi-threaded. Applications should check
430 the __libc_single_threaded variable declared in
431 <sys/single_threaded.h> instead.
433 * The "files" NSS module no longer supports the "key" database (used for
434 secure RPC). The contents of the /etc/publickey file will be ignored,
435 regardless of the settings in /etc/nsswitch.conf. (This method of
436 storing RPC keys only supported the obsolete and insecure AUTH_DES
437 flavor of secure RPC.)
439 * The __morecore and __after_morecore_hook malloc hooks and the default
440 implementation __default_morecore have been deprecated. Applications
441 should use malloc interposition to change malloc behavior, and mmap to
442 allocate anonymous memory. A future version of glibc may require that
443 applications which use the malloc hooks must preload a special shared
444 object, to enable the hooks.
446 * The hesiod NSS module has been deprecated and will be removed in a
447 future version of glibc. System administrators are encouraged to
448 switch to other approaches for networked account databases, such as
451 Changes to build and runtime requirements:
453 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
454 long double redirects.
456 Security related changes:
458 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
459 invoked with the -c option and when processing invalid multi-byte input
460 sequences. Reported by Jan Engelhardt.
462 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
463 corruption when they were passed a pseudo-zero argument. Reported by Guido
464 Vranken / ForAllSecure Mayhem.
466 CVE-2020-1752: A use-after-free vulnerability in the glob function when
467 expanding ~user has been fixed.
469 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
470 memmove functions has been fixed. Discovered by Jason Royes and Samual
471 Dytrych of the Cisco Security Assessment and Penetration Team (See
474 The following bugs are resolved with this release:
476 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
477 [10441] manual: Backtraces code example lacks error checking
478 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
479 timer_sigev_thread dangerous
480 [14231] stdio: stdio-common tests memory requirements
481 [14578] libc: /proc-based emulation for lchmod, fchmodat
482 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
483 filtee has constructor
484 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
485 sequences (CVE-2016-10228)
486 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
487 character entities for infinity & pi
488 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
489 segfaults in applications
490 [20543] libc: Please move from .gnu.linkonce to comdat
491 [22489] network: gcc warns about implicit convertion in
492 ICMP6_FILTER_SETPASS with -Wsign-conversion
493 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
494 [23294] math: Complex _FloatN functions are redirected to the wrong
495 function with -mlong-double-64
496 [23296] libc: Data race in setting function descriptor during lazy
498 [23668] dynamic-link: ldconfig: Default to the new format for
500 [23819] hurd: hurd: Add C11 thread support
501 [23990] build: test-container error out on failure to exec child.
502 [23991] build: shell-container typo in run_command_array
503 [24638] manual: Error in example of parsing a template string
504 [24654] manual: Wrong declaration of wcschr in libc manual
505 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
507 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
508 dynamically loaded dsos
509 [25098] nptl: nptl: ctype classification functions are not AS-Safe
510 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
512 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
513 restore EAX, ECX and EDX
514 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
515 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
516 [25420] network: Race condition in resolv_conf.c can result in caching
517 stale configuration forever
518 [25487] math: sinl() stack corruption from crafted input
520 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
522 [25523] libc: MIPS/Linux inline syscall template is miscompiled
523 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
525 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
526 on 32 bit and old kernel
527 [25635] libc: arm: Wrong sysdep order selection for soft-fp
528 [25639] localedata: Some names of days and months wrongly spelt in
530 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
531 amount of sigset_t bytes
532 [25691] stdio: printf: memory leak when printing long multibyte
534 [25715] libc: system() returns wrong errors when posix_spawn fails
535 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
536 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
537 state for conversions that produce two Unicode code points
538 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
539 for linux x86_64 leads to livelock
540 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
541 test failures, invalid instruction in ld.so
542 [25790] glob: Typo in tst-fnmatch.input
543 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
545 [25819] localedata: Update locale data to Unicode 13.0.0
546 [25824] libc: Abnormal function of strnlen in aarch64
547 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
548 [25896] libc: Incorrect prctl
549 [25902] libc: Bad LOADARGS_N
550 [25905] dynamic-link: VSX registers are corrupted during PLT
551 resolution when glibc is built with --disable-multi-arch and --with-
553 [25933] string: Off by one error in __strncmp_avx2 when
554 length=VEC_SIZE*4 and strings are at page boundaries can cause a
556 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
557 exiting detached thread
558 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
560 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
562 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
563 [26073] math: getpayload() has wrong return value
564 [26076] dynamic-link: dlmopen crashes after failing to load
565 dependencies in audit mode
566 [26120] localedata: column width of of some Korean
567 JUNGSEONG/JONGSEONG characters wrong (should be 0)
568 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
569 [26133] libc: Incorrect need_arch_feature_F16C
570 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
572 [26149] libc: PKU is usable only if OSPKE is set
573 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
575 [26208] libc: Incorrect bit_cpu_CLFSH
576 [26210] network: Incorrect use of hidden symbols for global sunrpc
578 [26211] stdio: printf integer overflow calculating allocation size
579 [26214] stdio: printf_fp double free
580 [26215] stdio: printf_fp memory leak
581 [26232] time: FAIL: support/tst-timespec for 32-bit targets
582 [26258] nss: nss_compat should not read input files with mmap
583 [26332] string: Incorrect cache line size load causes memory
591 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
592 enable features from the draft ISO C2X standard. Only some features from
593 this draft standard are supported by the GNU C Library, and as the draft
594 is under active development, the set of features enabled by this macro is
595 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
596 by compiling with "gcc -std=gnu2x".
598 * The <math.h> functions that round their results to a narrower type now
599 have corresponding type-generic macros in <tgmath.h>, as defined in TS
600 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
601 Clarification Request 13 to TS 18661-3.
603 * The function pthread_clockjoin_np has been added, enabling join with a
604 terminated thread with a specific clock. It allows waiting against
605 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
607 * New locale added: mnw_MM (Mon language spoken in Myanmar).
609 * The DNS stub resolver will optionally send the AD (authenticated data) bit
610 in queries if the trust-ad option is set via the options directive in
611 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
612 mode, the AD bit, as provided by the name server, is available to
613 applications which call res_search and related functions. In the default
614 mode, the AD bit is not set in queries, and it is automatically cleared in
615 responses, indicating a lack of DNSSEC validation. (Therefore, the name
616 servers and the network path to them are treated as untrusted.)
618 Deprecated and removed features, and other changes affecting compatibility:
620 * The totalorder and totalordermag functions, and the corresponding
621 functions for other floating-point types, now take pointer arguments to
622 avoid signaling NaNs possibly being converted to quiet NaNs in argument
623 passing. This is in accordance with the resolution of Clarification
624 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
625 floating-point arguments directly will continue to work.
627 * The obsolete function stime is no longer available to newly linked
628 binaries, and its declaration has been removed from <time.h>.
629 Programs that set the system time should use clock_settime instead.
631 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
632 in a future version of glibc. In this release, the header still exists
633 but calling ftime will cause a compiler warning. All programs should use
634 gettimeofday or clock_gettime instead.
636 * The gettimeofday function no longer reports information about a
637 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
638 many years, as it cannot handle the full complexity of the world's
639 timezones, but hitherto we have supported it on a best-effort basis.
640 Changes required to support 64-bit time_t on 32-bit architectures have
641 made this no longer practical.
643 As of this release, callers of gettimeofday with a non-null 'tzp' argument
644 should expect to receive a 'struct timezone' whose tz_minuteswest and
645 tz_dsttime fields are zero. (For efficiency reasons, this does not always
646 happen on a few Linux-based ports. This will be corrected in a future
649 All callers should supply a null pointer for the 'tzp' argument to
650 gettimeofday. For accurate information about the time zone associated
651 with the current time, use the localtime function.
653 gettimeofday itself is obsolescent according to POSIX. We have no plans
654 to remove access to this function, but portable programs should consider
655 using clock_gettime instead.
657 * The settimeofday function can still be used to set a system-wide time
658 zone when the operating system supports it. This is because the Linux
659 kernel reused the API, on some architectures, to describe a system-wide
660 time-zone-like offset between the software clock maintained by the kernel,
661 and the "RTC" clock that keeps time when the system is shut down.
663 However, to reduce the odds of this offset being set by accident,
664 settimeofday can no longer be used to set the time and the offset
665 simultaneously. If both of its two arguments are non-null, the call
666 will fail (setting errno to EINVAL).
668 Callers attempting to set this offset should also be prepared for the call
669 to fail and set errno to ENOSYS; this already happens on the Hurd and on
670 some Linux architectures. The Linux kernel maintainers are discussing a
671 more principled replacement for the reused API. After a replacement
672 becomes available, we will change settimeofday to fail with ENOSYS on all
673 platforms when its 'tzp' argument is not a null pointer.
675 settimeofday itself is obsolescent according to POSIX. Programs that set
676 the system time should use clock_settime and/or the adjtime family of
677 functions instead. We may cease to make settimeofday available to newly
678 linked binaries after there is a replacement for Linux's time-zone-like
681 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
682 the optional CAS instruction is implemented (for instance, LEON processors
683 are still supported, but SuperSPARC processors are not).
685 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
688 * If a lazy binding failure happens during dlopen, during the execution of
689 an ELF constructor, the process is now terminated. Previously, the
690 dynamic loader would return NULL from dlopen, with the lazy binding error
691 captured in a dlerror message. In general, this is unsafe because
692 resetting the stack in an arbitrary function call is not possible.
694 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
695 executable stack unless explicitly configured at build time to require
696 minimum kernel version 4.8 or newer. This is because executing
697 floating-point branches on a non-executable stack on Linux kernels prior to
698 4.8 can lead to application crashes for some MIPS configurations. While
699 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
700 expected to enable non-executable stack by default with PT_GNU_STACK by
701 default and is thus likely to trigger a crash on older kernels.
703 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
704 non-executable stack while dropping support for older kernels.
706 * System call wrappers for time system calls now use the new time64 system
707 calls when available. On 32-bit targets, these wrappers attempt to call
708 the new system calls first and fall back to the older 32-bit time system
709 calls if they are not present. This may cause issues in environments
710 that cannot handle unsupported system calls gracefully by returning
711 -ENOSYS. Seccomp sandboxes are affected by this issue.
713 Changes to build and runtime requirements:
715 * It is no longer necessary to have recent Linux kernel headers to build
716 working (non-stub) system call wrappers on all architectures except 64-bit
717 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
719 * The ChangeLog file is no longer present in the toplevel directory of the
720 source tree. ChangeLog files are located in the ChangeLog.old directory as
721 ChangeLog.N where the highest N has the latest entries.
723 Security related changes:
725 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
726 out-of-bounds write when executed in a signal frame context.
728 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
729 environment variable during program execution after a security
730 transition, allowing local attackers to restrict the possible mapping
731 addresses for loaded libraries and thus bypass ASLR for a setuid
732 program. Reported by Marcin Kościelnicki.
734 The following bugs are resolved with this release:
736 [12031] localedata: iconv -t ascii//translit with Greek characters
737 [15813] libc: Multiple issues in __gen_tempname
738 [17726] libc: [arm, sparc] profil_counter should be compat symbol
739 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
740 [19767] libc: vdso is not used with static linking
741 [19903] hurd: Shared mappings not being inherited by children processes
742 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
743 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
745 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
746 Symbols-A/B Unicode blocks
747 [23518] libc: Eliminate __libc_utmp_jump_table
748 [24026] malloc: malloc_info() returns wrong numbers
749 [24054] localedata: Many locales are missing date_fmt
750 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
751 [24304] dynamic-link: Lazy binding failure during ELF
752 constructors/destructors is not fatal
753 [24376] libc: RISC-V symbol size confusion with _start
754 [24682] localedata: zh_CN first weekday should be Monday per GB/T
756 [24824] libc: test-in-container does not install charmap files compatible
758 [24844] regex: regex bad pointer / leakage if malloc fails
759 [24867] malloc: Unintended malloc_info formatting changes
760 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
761 [24880] libc: login: utmp implementation uses struct flock with fcntl64
762 [24882] libc: login: pututline uses potentially outdated cache
763 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
764 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
766 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
768 [24930] dynamic-link: dlopen of PIE executable can result in
769 _dl_allocate_tls_init assertion failure
770 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
771 (stringop-overflow error)
772 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
773 functions other can lead to crashes
774 [24967] libc: jemalloc static linking causes runtime failure
775 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
777 [25035] libc: sbrk() failure handled poorly in tunables_strdup
778 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
779 [25097] libc: new -Warray-bounds with GCC 10
780 [25112] dynamic-link: dlopen must not make new objects accessible when it
781 still can fail with an error
782 [25139] localedata: Please add the new mnw_MM locale
783 [25149] regex: Array bounds violation in proceed_next_node
784 [25157] dynamic-link: Audit cookie for the dynamic loader is not
785 initialized correctly
786 [25189] libc: glibc's __glibc_has_include causes issues with clang
788 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
790 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
791 binaries (CVE-2019-19126)
792 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
794 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
796 [25232] string: <string.h> does not enable const correctness for strchr et
798 [25233] localedata: Consider "." as the thousands separator for sl_SI
800 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
801 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
802 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
804 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
805 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
807 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
808 (dl_initfirst) link map pointer
809 [25401] malloc: pvalloc must not have __attribute_alloc_size__
810 [25423] libc: Array overflow in backtrace on powerpc
811 [25425] network: Missing call to __resolv_context_put in
812 getaddrinfo.c:gethosts
819 * Unicode 12.1.0 Support: Character encoding, character type info, and
820 transliteration tables are all updated to Unicode 12.1.0, using
821 generator scripts contributed by Mike FABIAN (Red Hat).
823 * The dynamic linker accepts the --preload argument to preload shared
824 objects, in addition to the LD_PRELOAD environment variable.
826 * The twalk_r function has been added. It is similar to the existing
827 twalk function, but it passes an additional caller-supplied argument
828 to the callback function.
830 * On Linux, the getdents64, gettid, and tgkill functions have been added.
832 * Minguo (Republic of China) calendar support has been added as an
833 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
836 * The entry for the new Japanese era has been added for ja_JP locale.
838 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
839 pvalloc, memalign, and posix_memalign fail now with total object size
840 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
841 pointer subtraction within the allocated object, where results might
842 overflow the ptrdiff_t type.
844 * The dynamic linker no longer refuses to load objects which reference
845 versioned symbols whose implementation has moved to a different soname
846 since the object has been linked. The old error message, symbol
847 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
848 link time reference, is gone.
850 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
851 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
852 functions. These behave similarly to their "timed" equivalents, but also
853 accept a clockid_t parameter to determine which clock their timeout should
854 be measured against. All functions allow waiting against CLOCK_MONOTONIC
855 and CLOCK_REALTIME. The decision of which clock to be used is made at the
856 time of the wait (unlike with pthread_condattr_setclock, which requires
857 the clock choice at initialization time).
859 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
860 work, new resolvers can use a second argument which can be extended in
861 the future, currently it contains the AT_HWCAP2 value.
863 Deprecated and removed features, and other changes affecting compatibility:
865 * The copy_file_range function fails with ENOSYS if the kernel does not
866 support the system call of the same name. Previously, user space
867 emulation was performed, but its behavior did not match the kernel
868 behavior, which was deemed too confusing. Applications which use the
869 copy_file_range function can no longer rely on glibc to provide a fallback
870 on kernels that do not support the copy_file_range system call, and if
871 this function returns ENOSYS, they will need to use their own fallback.
872 Support for copy_file_range for most architectures was added in version
873 4.5 of the mainline Linux kernel.
875 * The functions clock_gettime, clock_getres, clock_settime,
876 clock_getcpuclockid, clock_nanosleep were removed from the librt library
877 for new applications (on architectures which had them). Instead, the
878 definitions in libc will be used automatically, which have been available
881 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
882 and <sys/stropts.h> have been removed.
884 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
885 resolver flag (deprecated in glibc 2.25) have been removed.
887 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
888 resolver have been removed from <resolv.h>.
890 * With --enable-bind-now, installed programs are now linked with the
893 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
894 configurations) has been removed, following the deprecation of this
895 subarchitecture in version 8 of GCC, and its removal in version 9.
897 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
898 header have been removed.
900 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
901 deprecated and will be removed from a future version of glibc.
902 Application should directly access /proc instead. For obtaining random
903 bits, the getentropy function can be used.
905 Changes to build and runtime requirements:
907 * GCC 6.2 or later is required to build the GNU C Library.
909 Older GCC versions and non-GNU compilers are still supported when
910 compiling programs that use the GNU C Library.
912 Security related changes:
914 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
915 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
916 has undefined behavior. On x32, the size_t argument may be passed
917 in the lower 32 bits of the 64-bit RDX register with non-zero upper
918 32 bits. When it happened with the sign bit of RDX register set,
919 memcmp gave the wrong result since it treated the size argument as
920 zero. Reported by H.J. Lu.
922 CVE-2019-9169: Attempted case-insensitive regular-expression match
923 via proceed_next_node in posix/regexec.c leads to heap-based buffer
924 over-read. Reported by Hongxu Chen.
926 The following bugs are resolved with this release:
928 [2872] locale: Transliteration Cyrillic -> ASCII fails
929 [6399] libc: gettid() should have a wrapper
930 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
931 [16976] glob: fnmatch unbounded stack VLA for collating symbols
932 [17396] localedata: globbing for locale by [[.collating-element.]]
933 [18035] dynamic-link: pldd does no longer work, enters infinite loop
934 [18465] malloc: memusagestat is built using system C library
935 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
936 invalid input drops valid char
937 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
938 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
939 [21897] localedata: Afar locales: Fix mon, abmon, and abday
940 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
941 [23352] malloc: __malloc_check_init still defined in public header
943 [23403] nptl: Wrong alignment of TLS variables
944 [23501] libc: nftw() doesn't return dangling symlink's inode
945 [23733] malloc: Check the count before calling tcache_get()
946 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
948 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
949 [23844] nptl: pthread_rwlock_trywrlock results in hang
950 [23983] argparse: Missing compat versions of argp_failure and argp_error
951 for long double = double
952 [23984] libc: Missing compat versions of err.h and error.h functions for
954 [23996] localedata: Dutch salutations
955 [24040] libc: riscv64: unterminated call chain in __thread_start
956 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
958 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
959 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
961 [24114] regex: regexec buffer read overrun in "grep -i
962 '\(\(\)*.\)*\(\)\(\)\1'"
963 [24122] libc: Segfaults if 0 returned from la_version
964 [24153] stdio: Some input functions do not react to stdin assignment
965 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
966 RDX is set) (CVE-2019-7309)
967 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
968 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
969 not the default "nor"
970 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
971 false positives, change to modern flexible array
972 [24180] nptl: pthread_mutex_trylock does not use the correct order of
973 instructions while maintaining the robust mutex list due to missing
975 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
976 unnecessary librt dependencies
977 [24200] localedata: Revert first_weekday removal in en_IE locale
978 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
979 [24215] nptl: pthread_timedjoin_np should be a cancellation point
980 [24216] malloc: Check for large bin list corruption when inserting
982 [24228] stdio: old x86 applications that use legacy libio crash on exit
983 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
985 [24293] localedata: Missing Minguo calendar support for TW locales
986 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
988 [24307] localedata: Update locale data to Unicode 12.0.0
989 [24323] dynamic-link: dlopen should not be able open PIE objects
990 [24335] build: "Obsolete types detected" with Linux 5.0 headers
991 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
993 [24370] localedata: Add lang_name for tt_RU locale
994 [24372] locale: Binary locale files are not architecture independent
995 [24394] time: strptime %Ey mis-parses final year of era
996 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
998 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1000 [24531] malloc: Malloc tunables give tcache assertion failures
1001 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1003 [24535] localedata: Update locale data to Unicode 12.1.0
1004 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1005 kernels and break testing
1006 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1007 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1008 [-Werror=format-overflow=]
1009 [24570] libc: alpha: compat msgctl uses __IPC_64
1010 [24584] locale: Data race in __wcsmbs_clone_conv
1011 [24588] stdio: Remove codecvt vtables from libio
1012 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1014 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1015 [24632] stdio: Old binaries which use freopen with default stdio handles
1017 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1019 [24652] localedata: szl_PL spelling correction
1020 [24695] nss: nss_db: calling getpwent after endpwent crashes
1021 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1022 in /etc/nsswitch.conf
1023 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1024 [24740] libc: getdents64 type confusion
1025 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1026 always implemented in the same library
1027 [24744] libc: Remove copy_file_range emulation
1028 [24757] malloc: memusagestat is linked against system libpthread
1029 [24794] libc: Partial test suite run builds corrupt test-in-container
1037 * The getcpu wrapper function has been added, which returns the currently
1038 used CPU and NUMA node. This function is Linux-specific.
1040 * A new convenience target has been added for distribution maintainers
1041 to build and install all locales as directories with files. The new
1042 target is run by issuing the following command in your build tree:
1043 'make localedata/install-locale-files', with an optional DESTDIR
1044 to set the install root if you wish to install into a non-default
1045 configured location.
1047 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1049 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1050 for _GNU_SOURCE, to match BSD environments.
1052 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1053 indicates that it will abort the transaction prior to entering the kernel
1054 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1055 suspended, and this caused some undefined side-effects issues by aborting
1056 transactions manually. Glibc avoided it by abort transactions manually on
1057 each syscall, but it lead to performance issues on newer kernels where the
1058 HTM state is saved and restore lazily (the state being saved even when the
1059 process actually does not use HTM).
1061 * The functions posix_spawn_file_actions_addchdir_np and
1062 posix_spawn_file_actions_addfchdir_np have been added, enabling
1063 posix_spawn and posix_spawnp to run the new process in a different
1064 directory. These functions are GNU extensions. The function
1065 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1068 * The popen and system do not run atfork handlers anymore (BZ#17490).
1069 Although it is a possible POSIX violation, the POSIX rationale in
1070 pthread_atfork documentation regarding atfork handlers is to handle
1071 inconsistent mutex state after a fork call in a multi-threaded process.
1072 In both popen and system there is no direct access to user-defined mutexes.
1074 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1075 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1077 - C-SKY ABIV2 soft-float little-endian
1078 - C-SKY ABIV2 hard-float little-endian
1080 * strftime's default formatting of a locale's alternative year (%Ey)
1081 has been changed to zero-pad the year to a minimum of two digits,
1082 like "%y". This improves the display of Japanese era years during
1083 the first nine years of a new era, and is expected to be harmless
1084 for all other locales (only Japanese locales regularly have
1085 alternative year numbers less than 10). Zero-padding can be
1086 overridden with the '_' or '-' flags (which are GNU extensions).
1088 * As a GNU extension, the '_' and '-' flags can now be applied to
1089 "%EY" to control how the year number is formatted; they have the
1090 same effect that they would on "%Ey".
1092 Deprecated and removed features, and other changes affecting compatibility:
1094 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1095 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1097 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1098 in <sys/procfs.h>, has been corrected to match the type actually used by
1099 the Linux kernel. This affects the size and layout of that structure on
1100 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1102 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1103 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1104 defined in <sys/procfs.h>, has been corrected to match the type actually
1105 used by the Linux kernel. This affects the size and layout of those
1108 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1109 meant to scan a string and allocate space for it with malloc, is now
1110 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1111 defined. This extension conflicts with C99's use of '%a' to scan a
1112 hexadecimal floating-point number, which is now available to programs
1113 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1115 POSIX.1-2008 includes the feature of allocating a buffer for string input
1116 with malloc, using the modifier letter 'm' instead. Programs using
1117 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1118 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1119 C99 '%a' no longer need to avoid _GNU_SOURCE.
1121 GCC's -Wformat warnings can detect most uses of this extension, as long
1122 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1123 __attribute__ ((format (scanf, ...))).
1125 Changes to build and runtime requirements:
1127 * Python 3.4 or later is required to build the GNU C Library.
1129 * On most architectures, GCC 5 or later is required to build the GNU C
1130 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1132 Older GCC versions and non-GNU compilers are still supported when
1133 compiling programs that use the GNU C Library.
1135 Security related changes:
1137 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1138 denial of service due to resource exhaustion when processing getaddrinfo
1139 calls with crafted host names. Reported by Guido Vranken.
1141 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1142 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1143 happened, accessing the 32-bit size_t value as the full 64-bit register
1144 in the assembly string/memory functions would cause a buffer overflow.
1145 Reported by H.J. Lu.
1147 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1148 addresses with arbitrary trailing characters, potentially leading to data
1149 or command injection issues in applications.
1151 The following bugs are resolved with this release:
1153 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1154 [10496] localedata: 12h time representation in multiple locales faulty
1155 [10797] localedata: it_IT locale numeric does not have a separator for
1157 [11319] libc: dprintf doesn't handle errors properly
1158 [16346] time: mktime: potentially unsafe use of localtime_offset
1159 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1161 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1162 posix_spawn_file_actions_addfchdir_np
1163 [17426] localedata: Indian locales: set the correct date format
1164 [17490] stdio: popen should not invoke atfork handlers
1165 [17783] libc: TIOCSER_TEMT conditions inconsistent
1166 [18040] regex: use-after-free in regexec/get_subexp
1167 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1168 [20018] network: getaddrinfo should reject IP addresses with trailing
1169 characters (CVE-2016-10739)
1170 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1171 [20271] libc: Missing "\n" in __libc_fatal calls
1172 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1173 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1174 pointer argument is non-NULL
1175 [21037] stdio: open_memstream and freopen
1176 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1177 [21716] time: Crash in glibc's mktime in low-memory situations
1178 [22834] stdio: Subprocess forked by popen may crash in Linux when
1179 multithreads call popen
1180 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1181 and pthread_create fails.
1182 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1183 [23125] libc: riscv64: endless loop when throwing an exception from a
1185 [23275] nptl: Race in pthread_mutex_lock while promoting to
1186 PTHREAD_MUTEX_ELISION_NP.
1187 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1189 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1191 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1193 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1194 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1196 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1197 [23521] nss: get_next_alias nss_files file stream leak
1198 [23538] nptl: Hang in pthread_cond_broadcast
1199 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1200 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1201 [23579] libc: Errors misreported in preadv2
1202 [23597] build: support/test-container.c doesn't work with different
1204 [23603] time: mktime signed integer overflow on large timestamps
1205 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1206 [23614] libc: powerpc: missing CFI register information in __mpn_*
1208 [23637] string: Generic strstr/strcasestr fails with huge needles
1209 [23640] libc: no way to easily clear FD_CLOEXEC in
1210 posix_spawn_file_actions_adddup2()
1211 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1213 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1215 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1216 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1217 bits/types/struct_rusage.h
1218 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1220 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1222 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1223 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1224 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1226 [23724] localedata: Albanian date formats are incorrect
1227 [23735] math: libnldbl_nonshared.a references internal libm symbols
1228 [23740] localedata: kl_GL: Month names and date formats need update
1229 [23744] regex: regex refactorings to remove BE, avoid duplication
1230 [23745] time: mktime fix for Gnulib + coreutils
1231 [23758] time: Improve the width of alternate representation for year in
1233 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1234 [23789] time: mktime does not set errno on failure
1235 [23791] localedata: Wrong monetary format for ca_ES locale
1236 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1237 [23794] locale: c16rtomb does not handle surrogate pairs
1238 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1239 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1240 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1241 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1242 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1243 [23862] libc: [sh] missing kernel-features.h undefines
1244 [23864] libc: [riscv] missing kernel-features.h undefines
1245 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1246 [23907] malloc: Incorrect double-free malloc tcache check disregards
1248 [23913] libc: off-by-one in function maybe_script_execute in
1249 sysdeps/posix/spawni.c
1250 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1251 [23923] locale: Add --no-hard-links option to localedef
1252 [23927] network: Linux if_nametoindex() does not close descriptor
1254 [23961] math: powf can overflow to inf without setting errno in non-
1255 nearest rounding mode
1256 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1257 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1258 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1259 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1260 [24011] localedata: Fixed small type in comment for locale bs_BA
1261 [24018] libc: gettext() may return NULL
1262 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1263 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1264 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1266 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1267 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1269 [24046] localedata: en_US locale doesn't define date_fmt
1270 [24063] manual: @var{errno} should be @code{errno}
1271 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1272 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1274 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1276 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1278 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1280 [24112] network: Do not send DNS queries for non-host names (where all
1281 answers will be rejected)
1282 [24130] libc: alpha __remqu corrupts $f3 register
1289 * The localization data for ISO 14651 is updated to match the 2016
1290 Edition 4 release of the standard, this matches data provided by
1291 Unicode 9.0.0. This update introduces significant improvements to the
1292 collation of Unicode characters. This release deviates slightly from
1293 the standard in that the collation element ordering for lowercase and
1294 uppercase LATIN script characters is adjusted to ensure that regular
1295 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1296 is not matched by [a-z]. With the update many locales have been
1297 updated to take advantage of the new collation information. The new
1298 collation information has increased the size of the compiled locale
1299 archive or binary locales.
1301 * The GNU C Library can now be compiled with support for Intel CET, AKA
1302 Intel Control-flow Enforcement Technology. When the library is built
1303 with --enable-cet, the resulting glibc is protected with indirect
1304 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1305 compatible with all existing executables and shared libraries. This
1306 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1307 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1308 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1309 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1310 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1311 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1314 * The GNU C Library now has correct support for ABSOLUTE symbols
1315 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1316 relocated incorrectly or in some cases discarded. The GNU linker can
1317 make use of the newer semantics, but it must communicate it to the
1318 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1319 field) to indicate such support is required.
1321 * Unicode 11.0.0 Support: Character encoding, character type info, and
1322 transliteration tables are all updated to Unicode 11.0.0, using
1323 generator scripts contributed by Mike FABIAN (Red Hat).
1325 * <math.h> functions that round their results to a narrower type are added
1326 from TS 18661-1:2014 and TS 18661-3:2015:
1328 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1329 fMxaddfNx functions.
1331 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1332 fMxsubfNx functions.
1334 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1335 fMxmulfNx functions.
1337 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1338 fMxdivfNx functions.
1340 * Two grammatical forms of month names are now supported for the following
1341 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1342 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1343 support two grammatical forms in abbreviated month names: Catalan, Greek,
1346 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1347 include the support for two grammatical forms of month names.
1349 * Building and running on GNU/Hurd systems now works without out-of-tree
1352 * The renameat2 function has been added, a variant of the renameat function
1353 which has a flags argument. If the flags are zero, the renameat2 function
1354 acts like renameat. If the flag is not zero and there is no kernel
1355 support for renameat2, the function will fail with an errno value of
1356 EINVAL. This is different from the existing gnulib function renameatu,
1357 which performs a plain rename operation in case of a RENAME_NOREPLACE
1358 flags and a non-existing destination (and therefore has a race condition
1359 that can clobber the destination inadvertently).
1361 * The statx function has been added, a variant of the fstatat64
1362 function with an additional flags argument. If there is no direct
1363 kernel support for statx, glibc provides basic stat support based on
1364 the fstatat64 function.
1366 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1367 library if installed. libidn2 version 2.0.5 or later is recommended. If
1368 libidn2 is not available, internationalized domain names are not encoded
1369 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1370 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1371 with an encoding error.) Flags which used to change the IDN encoding and
1372 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1373 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1374 deprecated. They no longer have any effect.
1376 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1377 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1378 range of ELF gABI expressions including such constructs as
1379 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1380 have been further restricted, and where in the past a dynamic string
1381 token sequence may have been interpreted as a literal string it will
1382 now cause a load failure. These load failures were always considered
1383 unspecified behaviour from the perspective of the dynamic loader, and
1384 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1385 results in a load failure now.
1387 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1388 implementation includes all the standard functions provided by
1391 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1392 thrd_detach, thrd_exit, and thrd_join for thread management.
1394 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1395 mtx_destroy for mutual exclusion.
1397 - call_once for function call synchronization.
1399 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1400 cnd_wait for conditional variables.
1402 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1404 Application developers must link against libpthread to use ISO C threads.
1406 Deprecated and removed features, and other changes affecting compatibility:
1408 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1409 installed. Software that was using either header should be updated to
1410 use standard <stdio.h> interfaces instead.
1412 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1413 This was never required by the C standard, and the macros just expanded
1414 to call alternative names for the same functions. If you hoped getc and
1415 putc would provide performance improvements over fgetc and fputc, instead
1416 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1417 necessary, flockfile and funlockfile.
1419 * All stdio functions now treat end-of-file as a sticky condition. If you
1420 read from a file until EOF, and then the file is enlarged by another
1421 process, you must call clearerr or another function with the same effect
1422 (e.g. fseek, rewind) before you can read the additional data. This
1423 corrects a longstanding C99 conformance bug. It is most likely to affect
1424 programs that use stdio to read interactive input from a terminal.
1427 * The macros 'major', 'minor', and 'makedev' are now only available from
1428 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1429 headers that happen to include <sys/types.h>. These macros are rarely
1430 used, not part of POSIX nor XSI, and their names frequently collide with
1431 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1432 further explanation.
1434 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1435 these macros should first include <sys/types.h>, and then include
1436 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1438 * The tilegx*-*-linux-gnu configurations are no longer supported.
1440 * The obsolete function ustat is no longer available to newly linked
1441 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1442 function has been deprecated in favor of fstatfs and statfs.
1444 * The obsolete function nfsservctl is no longer available to newly linked
1445 binaries. This function was specific to systems using the Linux kernel
1446 and could not usefully be used with the GNU C Library on systems with
1447 version 3.1 or later of the Linux kernel.
1449 * The obsolete function name llseek is no longer available to newly linked
1450 binaries. This function was specific to systems using the Linux kernel
1451 and was not declared in a header. Programs should use the lseek64 name
1452 for this function instead.
1454 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1455 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1456 previously selected by them is now always enabled.
1458 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1459 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1460 restriction (rejecting '_' in host names, among other things) has been
1461 removed, for increased compatibility with non-IDN name resolution.
1463 * The fcntl function now have a Long File Support variant named fcntl64. It
1464 is added to fix some Linux Open File Description (OFD) locks usage on non
1465 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1466 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1467 locks act as a cancellation entrypoint.
1469 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1470 ecb_crypt, and des_setparity are no longer available to newly linked
1471 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1472 longer installed. These functions encrypted and decrypted data with the
1473 DES block cipher, which is no longer considered secure. Software that
1474 still uses these functions should switch to a modern cryptography library,
1477 * Reflecting the removal of the encrypt and setkey functions above, the
1478 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1479 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1482 * The obsolete function fcrypt is no longer available to newly linked
1483 binaries. It was just another name for the standard function crypt,
1484 and it has not appeared in any header file in many years.
1486 * We have tentative plans to hand off maintenance of the passphrase-hashing
1487 library, libcrypt, to a separate development project that will, we hope,
1488 keep up better with new passphrase-hashing algorithms. We will continue
1489 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1490 'crypt_r' should not need to change at all; however, distributions will
1491 need to install <crypt.h> and libcrypt from a separate project.
1493 In this release, if the configure option --disable-crypt is used, glibc
1494 will not install <crypt.h> or libcrypt, making room for the separate
1495 project's versions of these files. The plan is to make this the default
1496 behavior in a future release.
1498 Changes to build and runtime requirements:
1500 GNU make 4.0 or later is now required to build glibc.
1502 Security related changes:
1504 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1505 been fixed by removing the glibc-internal IDNA implementation and using
1506 the system-provided libidn2 library instead. Originally reported by Hanno
1507 Böck and Christian Weisgerber.
1509 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1510 architecture could corrupt memory. Reported by Max Horn.
1512 CVE-2018-11236: Very long pathname arguments to realpath function could
1513 result in an integer overflow and buffer overflow. Reported by Alexey
1516 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1517 architecture could write beyond the target buffer, resulting in a buffer
1518 overflow. Reported by Andreas Schwab.
1520 The following bugs are resolved with this release:
1522 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1523 [6889] manual: 'PWD' mentioned but not specified
1524 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1525 when __WORDSIZE != 64
1526 [13762] regex: re_search etc. should return -2 on memory exhaustion
1527 [13888] build: /tmp usage during testing
1528 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1529 [14092] nptl: Support C11 threads
1530 [14095] localedata: Review / update collation data from Unicode / ISO
1532 [14508] libc: -Wformat warnings
1533 [14553] libc: Namespace pollution loff_t in sys/types.h
1534 [14890] libc: Make NT_PRFPREG canonical.
1535 [15105] libc: Extra PLT references with -Os
1536 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1538 [16335] manual: Feature test macro documentation incomplete and out of
1540 [16552] libc: Unify umount implementations in terms of umount2
1541 [17082] libc: htons et al.: statement-expressions prevent use on global
1542 scope with -O1 and higher
1543 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1544 [17438] localedata: pt_BR: wrong d_fmt delimiter
1545 [17662] libc: please implement binding for the new renameat2 syscall
1546 [17721] libc: __restrict defined as /* Ignore */ even in c11
1547 [17979] libc: inconsistency between uchar.h and stdint.h
1548 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1549 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1550 horrible machine code)
1551 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1553 [18471] libc: llseek should be a compat symbol
1554 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1556 [18991] nss: nss_files skips large entry in database
1557 [19239] libc: Including stdlib.h ends up with macros major and minor being
1559 [19463] libc: linknamespace failures when compiled with -Os
1560 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1561 [19527] locale: Normalized charset name not recognized by setlocale
1562 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1563 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1565 [19728] network: out of bounds stack read in libidn function
1566 idna_to_ascii_4i (CVE-2016-6261)
1567 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1568 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1569 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1571 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1572 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1573 [20419] dynamic-link: files with large allocated notes crash in
1575 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1576 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1577 [20980] manual: CFLAGS environment variable replaces vital options
1578 [21163] regex: Assertion failure in pop_fail_stack when executing a
1579 malformed regexp (CVE-2015-8985)
1580 [21234] manual: use of CFLAGS makes glibc detect no optimization
1581 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1582 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1583 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1584 [21508] locale: intl/tst-gettext failure with latest msgfmt
1585 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1586 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1587 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1589 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1591 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1592 [22247] network: Integer overflow in the decode_digit function in
1593 puny_decode.c in libidn (CVE-2017-14062)
1594 [22342] nscd: NSCD not properly caching netgroup
1595 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1596 [22550] localedata: es_ES locale (and other es_* locales): collation
1597 should treat ñ as a primary different character, sync the collation
1598 for Spanish with CLDR
1599 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1600 by gcc configured with --enable-default-pie
1601 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1602 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1603 crossing 2GB threshold (CVE-2017-18269)
1604 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1606 [22735] time: Misleading typo in time.h source comment regarding
1608 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1609 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1610 `__assert_perror_fail ()' to `__assert_fail_base ()'
1611 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1613 [22786] libc: Stack buffer overflow in realpath() if input size is close
1614 to SSIZE_MAX (CVE-2018-11236)
1615 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1616 through an absolute DT_NEEDED path
1617 [22792] build: tcb-offsets.h dependency dropped
1618 [22797] libc: pkey_get() uses non-reserved name of argument
1619 [22807] libc: PTRACE_* constants missing for powerpc
1620 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1621 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1622 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1623 [22848] localedata: ca_ES: update date definitions from CLDR
1624 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1625 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1626 [22896] localedata: Update locale data for an_ES
1627 [22902] math: float128 test failures with GCC 8
1628 [22918] libc: multiple common of `__nss_shadow_database'
1629 [22919] libc: sparc32: backtrace yields infinite backtrace with
1631 [22926] libc: FTBFS on powerpcspe
1632 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1634 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1635 [22947] libc: FAIL: misc/tst-preadvwritev2
1636 [22963] localedata: cs_CZ: Add alternative month names
1637 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1638 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1639 [22998] dynamic-link: execstack tests are disabled when SELinux is
1641 [23005] network: Crash in __res_context_send after memory allocation
1643 [23007] math: strtod cannot handle -nan
1644 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1645 [23036] regex: regex equivalence class regression
1646 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1647 [23069] libc: sigaction broken on riscv64-linux-gnu
1648 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1649 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1650 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1651 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1652 and libc build with -Os)
1653 [23140] localedata: More languages need two forms of month names
1654 [23145] libc: _init/_fini aren't marked as hidden
1655 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1656 [23171] math: C++ iseqsig for long double converts arguments to double
1657 [23178] nscd: sudo will fail when it is run in concurrent with commands
1658 that changes /etc/passwd
1659 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1661 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1662 [23208] localedata: New locale - Lower Sorbian (dsb)
1663 [23233] regex: Memory leak in build_charclass_op function in file
1665 [23236] stdio: Harden function pointers in _IO_str_fields
1666 [23250] nptl: Offset of __private_ss differs from GCC
1667 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1668 -mtune=generic -mfpmath=sse
1669 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1671 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1672 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1674 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1675 [23277] math: nan function should not have const attribute
1676 [23279] math: scanf and strtod wrong for some hex floating-point
1677 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1679 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1680 [23303] build: undefined reference to symbol
1681 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1682 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1684 [23313] stdio: libio vtables validation and standard file object
1686 [23329] libc: The __libc_freeres infrastructure is not properly run across
1688 [23349] libc: Various glibc headers no longer compatible with
1690 [23351] malloc: Remove unused code related to heap dumps and malloc
1692 [23363] stdio: stdio-common/tst-printf.c has non-free license
1693 [23396] regex: Regex equivalence regression in single-byte locales
1694 [23422] localedata: oc_FR: More updates of locale data
1695 [23442] build: New warning with GCC 8
1696 [23448] libc: Out of bounds access in IBM-1390 converter
1697 [23456] libc: Wrong index_cpu_LZCNT
1698 [23458] build: tst-get-cpu-features-static isn't added to tests
1699 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1701 [23467] dynamic-link: x86/CET: A property note parser bug
1708 * The GNU C Library can now be compiled with support for building static
1709 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1710 executables are like static executables but can be loaded at any address
1711 and provide additional security hardening benefits at the cost of some
1712 memory and performance. When the library is built with --enable-static-pie
1713 the resulting libc.a is usable with GCC 8 and above to create static PIE
1714 executables using the GCC option '-static-pie'. This feature is currently
1715 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1716 aarch64 with binutils 2.30 or later.
1718 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1719 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1722 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1724 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1726 * In order to support faster and safer process termination the malloc API
1727 family of functions will no longer print a failure address and stack
1728 backtrace after detecting heap corruption. The goal is to minimize the
1729 amount of work done after corruption is detected and to avoid potential
1730 security issues in continued process execution. Reducing shutdown time
1731 leads to lower overall process restart latency, so there is benefit both
1732 from a security and performance perspective.
1734 * The abort function terminates the process immediately, without flushing
1735 stdio streams. Previous glibc versions used to flush streams, resulting
1736 in deadlocks and further data corruption. This change also affects
1737 process aborts as the result of assertion failures.
1739 * On platforms where long double has the IEEE binary128 format (aarch64,
1740 alpha, mips64, riscv, s390 and sparc), the math library now implements
1741 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1742 These are the same interfaces added in version 2.26 for some platforms where
1743 this format is supported but is not the format of long double.
1745 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1746 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1747 implements interfaces for that type, as defined by ISO/IEC TS
1748 18661-3:2015. These are corresponding interfaces to those supported for
1751 * The math library now implements interfaces for the _Float32, _Float64 and
1752 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1753 corresponding interfaces to those supported for _Float128.
1755 * glibc now implements the memfd_create and mlock2 functions on Linux.
1757 * Support for memory protection keys was added. The <sys/mman.h> header now
1758 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1761 * The copy_file_range function was added.
1763 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1765 * The ldconfig utility now processes `include' directives using the C/POSIX
1766 collation ordering. Previous glibc versions used locale-specific
1767 ordering, the change might break systems that relied on that.
1769 * Support for two grammatical forms of month names has been added.
1770 In a call to strftime, the "%B" and "%b" format specifiers will now
1771 produce the grammatical form required when the month is used as part
1772 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1773 required when the month is named by itself. For instance, in Greek
1774 and in many Slavic and Baltic languages, "%B" will produce the month
1775 in genitive case, and "%OB" will produce the month in nominative case.
1777 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1778 are all valid and will all accept any known form of month
1779 name---standalone or complete, abbreviated or full. In a call to
1780 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1781 the strings used by "%B" and "%b", respectively. New query
1782 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1783 used by "%OB" and "%Ob", respectively.
1785 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1786 define the strings for %OB and %Ob, respectively; these have the
1787 same syntax as "mon" and "abmon". These arrays are optional; if they
1788 are not provided then they have the same content as "mon" and "abmon",
1791 These features are provided for locales which define "alt_mon" and/or
1792 "ab_alt_mon" in their locale source data. This release includes such
1793 alternative month name data for the following languages: Belarusian,
1794 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1796 This feature is currently a GNU extension, but it is expected to
1797 be added to the next revision of POSIX, and it is also already
1798 available on some BSD-derived operating systems.
1800 This feature will cause existing statically compiled applications
1801 to fail to load locales and fall back to the builtin C/POSIX locales.
1802 See notes below for other changes affecting compatibility.
1804 * Support for the RISC-V ISA running on Linux has been added. This port
1805 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1806 for the following ISA and ABI pairs:
1812 Deprecated and removed features, and other changes affecting compatibility:
1814 * Statically compiled applications attempting to load locales compiled for the
1815 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1816 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1817 support for two grammatical forms of the month names, also extends the locale
1818 data binary format. Static applications needing locale support must be
1819 recompiled to match the runtime and data they are deployed with. In some
1820 distributions there is an upgrade window where dynamically linked applications
1821 may use a new library but the old locale data and also fall back to the
1822 builtin C/POSIX locales; restarting the application process is sufficient to
1825 * Support for statically linked applications which call dlopen is deprecated
1826 and will be removed in a future version of glibc. Applications which call
1827 dlopen need to be linked dynamically instead.
1829 * Support for old programs which use internal stdio data structures and
1830 functions is deprecated. This includes programs which use the C++ streams
1831 provided by libstdc++ in GCC 2.95. Programs which use the internal
1832 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1833 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1834 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1835 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1836 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1837 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1838 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1839 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1840 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1841 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1842 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1843 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1844 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1845 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1846 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1847 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1848 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1849 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1850 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1851 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1852 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1853 future version of glibc. Unlike other symbol removals, these old
1854 applications will not be supported using compatibility symbols.
1856 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1857 defined by <sys/ptrace.h>.
1859 * libm no longer supports SVID error handling (calling a user-provided
1860 matherr function on error) or the _LIB_VERSION variable to control error
1861 handling. (SVID error handling and the _LIB_VERSION variable still work
1862 for binaries linked against older versions of the GNU C Library.) The
1863 libieee.a library is no longer provided. math.h no longer defines struct
1864 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1865 TLOSS, PLOSS and HUGE.
1867 * The libm functions pow10, pow10f and pow10l are no longer supported for
1868 new programs. Programs should use the standard names exp10, exp10f and
1869 exp10l for these functions instead.
1871 * The mcontext_t type is no longer the same as struct sigcontext. On
1872 platforms where it was previously the same, this changes the C++ name
1873 mangling for interfaces involving this type.
1875 * The add-ons mechanism for building additional packages at the same time as
1876 glibc has been removed. The --enable-add-ons configure option is now
1879 * The --without-fp configure option is now ignored. Whether hardware
1880 floating-point instructions are used is now configured based on whether
1881 the compiler used at configure time (without any options implied by a
1882 --with-cpu= configure option) uses such instructions.
1884 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1885 the specified string can be parsed as a domain name.
1887 * In the malloc_info output, the <heap> element may contain another <aspace>
1888 element, "subheaps", which contains the number of sub-heaps.
1890 * The libresolv function p_secstodate is no longer supported for new
1893 * The tilepro-*-linux-gnu configuration is no longer supported.
1895 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1896 and will be removed in a future release. Software that is still using
1897 either header should be updated to use standard <stdio.h> interfaces
1900 libio.h was originally the header for a set of supported GNU extensions,
1901 but they have not been maintained as such in many years, they are now
1902 standing in the way of improvements to stdio, and we don't think there are
1903 any remaining external users. _G_config.h was never intended for public
1904 use, but predates the bits convention.
1906 Changes to build and runtime requirements:
1908 * bison version 2.7 or later is required to generate code in the 'intl'
1911 Security related changes:
1913 CVE-2009-5064: The ldd script would sometimes run the program under
1914 examination directly, without preventing code execution through the
1915 dynamic linker. (The glibc project disputes that this is a security
1916 vulnerability; only trusted binaries must be examined using the ldd
1919 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1920 suffered from a one-byte overflow during ~ operator processing (either
1921 on the stack or the heap, depending on the length of the user name).
1922 Reported by Tim Rühsen.
1924 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1925 would sometimes fail to free memory allocated during ~ operator
1926 processing, leading to a memory leak and, potentially, to a denial
1929 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1930 without GLOB_NOESCAPE, could write past the end of a buffer while
1931 unescaping user names. Reported by Tim Rühsen.
1933 CVE-2017-17426: The malloc function, when called with an object size near
1934 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1935 instead of NULL. This was a regression introduced with the new malloc
1936 thread cache in glibc 2.26. Reported by Iain Buclaw.
1938 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1939 to the allocation of too much memory. (This is not a security bug per se,
1940 it is mentioned here only because of the CVE assignment.) Reported by
1943 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1944 of the number of search path components. (This is not a security
1945 vulnerability per se because no trust boundary is crossed if the fix for
1946 CVE-2017-1000366 has been applied, but it is mentioned here only because
1947 of the CVE assignment.) Reported by Qualys.
1949 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1950 for AT_SECURE or SUID binaries could be used to load libraries from the
1953 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1954 succeeds without returning an absolute path due to unexpected behaviour
1955 of the Linux kernel getcwd syscall. Reported by halfdog.
1957 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1958 an object size near the value of SIZE_MAX, would return a pointer to a
1959 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1961 CVE-2018-6551: The malloc function, when called with an object size near
1962 the value of SIZE_MAX, would return a pointer to a buffer which is too
1963 small, instead of NULL.
1965 The following bugs are resolved with this release:
1967 [866] glob: glob should match dangling symlinks
1968 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1969 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1971 [5997] math: Very slow execution of sinf function
1972 [10580] localedata: hr_HR: updated locale
1973 [10871] locale: 'mon' array should contain both nominative and genitive
1975 [12349] localedata: eu_ES: incorrect thousands separator
1976 [13605] localedata: shn_MM: new Shan locale
1977 [13805] localedata: ru_RU: currency should use ',' as radix point
1978 [13953] localedata: km_KH: locale update
1979 [13994] localedata: mjw_IN: new locale
1980 [14121] build: make writes .mo files in po directory
1981 [14333] libc: Fix the race between atexit() and exit()
1982 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1983 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1985 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1986 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1987 width Latin characters
1988 [15332] localedata: es_CU: locale update
1989 [15436] stdio: Don't close or flush stdio streams on abort
1990 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1992 [16148] localedata: ca_ES: incorrect thousands separator
1993 [16750] dynamic-link: ldd should not try to execute the binaries
1995 [16777] localedata: pl_PL: incorrect thousands separator in locale
1996 [16905] localedata: hanzi: new collation
1997 [17563] localedata: cmn_TW: add hanzi collation
1998 [17750] localedata: wrong collation order of diacritics in most locales
1999 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2001 [17956] build: Build fails on missing definitions from header file
2002 nss/nss.h when Mozilla NSS is used for cryptography
2003 [18203] libc: realpath() does not handle unreachable paths correctly
2004 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2005 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2006 [18822] libc: Internal functions are called via PLT
2007 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2008 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2009 [19574] libc: glibc should support building static PIE binaries
2010 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2012 [19971] glob: glob: Do not skip entries with zero d_ino values
2013 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2014 [20008] localedata: km_KH: convert to translit_neutral
2015 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2016 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2017 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2018 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2019 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2021 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2022 they're set, wrong errors returned by gaih_inet when lookup functions
2024 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2025 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2027 [20952] localedata: yuw_PG: new locale
2028 [21084] localedata: charmaps/IBM858: new codepage
2029 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2030 [21242] libc: assert gives pedantic warning in old gcc versions
2031 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2032 __regcall calling convention
2033 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2034 [21326] libc: C99 functions are not declared for C++11 and later if
2035 _GNU_SOURCE is not predefined by g++
2036 [21457] libc: sys/ucontext.h namespace
2037 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2038 [21660] math: GCC fails to compile a formula with tgmath.h
2039 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2040 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2041 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2042 [21684] math: tgmath.h handling of complex integers
2043 [21685] math: tgmath.h handling of bit-fields
2044 [21686] math: tgmath.h handling of __int128
2045 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2047 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2049 [21750] localedata: column width of characters incompatible with classical
2051 [21754] malloc: malloc: Perform as little work as possible after heap
2052 consistency check failures
2053 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2054 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2055 [21791] string: Unused XXX_chk_XXX functions in libc.a
2056 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2058 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2060 [21845] localedata: Added new Locale bho_NP
2061 [21853] localedata: Fix abday Which looks same as day in zh_SG
2062 [21854] localedata: Added New Locale en_SC
2063 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2064 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2065 _dl_runtime_resolve_avx_slow
2066 [21885] network: getaddrinfo: gethosts does not release resolver context
2067 on memory allocation failure
2068 [21899] libc: XPG4.2 sigaction namespace
2069 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2071 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2073 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2074 errno value, causing getaddrinfo to fail
2075 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2076 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2077 instead of EAI_NODATA
2078 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2079 constant PTRACE_SEIZE_DEVEL
2080 [21930] math: C-only gcc builtins used in <math.h> isinf
2081 [21932] network: Unpaired __resolv_context_get in generic get*_r
2083 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2084 [21944] libc: sigval namespace
2085 [21951] localedata: Update hanzi collation by stroke
2086 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2087 sysdeps/x86_64/fpu/e_expf.S
2088 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2089 allocation in syscall loops)
2090 [21959] localedata: Fix Country name for xh_ZA
2091 [21960] localedata: Fix abmon for bem_ZM
2092 [21966] math: AVX2 mathvec functions use FMA without checking
2093 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2094 [21971] localedata: Added New Locale for mfe_MU
2095 [21972] libc: assert macro requires operator== (int) for its argument type
2096 [21973] math: [sparc] libm missing sqrtl compat symbol
2097 [21974] libc: Remove __bb_init_func and __bb_exit_func
2098 [21982] string: stratcliff.c: error: assuming signed overflow does not
2100 [21986] stdio: __guess_grouping is called incorrectly
2101 [21987] math: [sparc32] wrong bits/long-double.h installed
2102 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2104 [22022] localedata: Missing country_name for mni_IN
2105 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2107 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2109 [22026] locale: iconv_open: heap overflow on gconv_init failure
2110 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2111 [22035] math: [m68k] bits/math-inline.h macro namespace
2112 [22038] localedata: Fix abbreviated weeks and months for Somali
2113 [22044] localedata: Remove redundant data for Limburgish Language
2114 [22050] malloc: Linking with -lmcheck does not hook
2115 __malloc_initialize_hook correctly
2116 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2117 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2118 [22070] localedata: charmaps/UTF-8: wcwidth for
2119 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2120 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2121 Jungseong and Jongseong) should be 0
2122 [22078] nss: nss_files performance issue in multi mode
2123 [22082] math: bits/math-finite.h exp10 condition
2124 [22086] libc: pcprofiledump incorrect cross-endian condition
2125 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2126 [22095] network: Name server address allocation memory leak in resolv.conf
2128 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2130 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2131 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2133 [22111] malloc: malloc: per thread cache is not returned when thread exits
2134 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2135 [22134] libc: [linux] implement fexecve with execveat
2136 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2138 [22145] libc: ttyname() gives up too early in the face of namespaces
2139 [22146] math: C++ build issue with float128 on x86_64
2140 [22153] nptl: nptl: save error code before process termination
2141 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2142 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2143 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2144 [22165] libc: [hppa] Text relocations in libc.so
2145 [22180] libc: destructor registered via __cxa_atexit is called twice
2146 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2147 symlinks") cause "make" segfaults
2148 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2150 [22207] libc: FAIL: stdlib/test-atexit-race
2151 [22225] math: nearbyint arithmetic moved before feholdexcept
2152 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2153 [22235] math: iscanonical in C++ and float128
2154 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2155 the svid compat wrapper
2156 [22244] math: ynf and yn are wrong without the svid compat wrapper
2157 [22273] libc: Improper assert in Linux posix_spawn implementation
2158 [22284] libc: -pg -pie doesn't work
2159 [22292] locale: localedef exits with error 4 when it should be error 1
2160 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2161 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2163 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2164 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2166 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2167 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2168 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2169 [22322] libc: [mips64] wrong bits/long-double.h installed
2170 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2171 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2173 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2174 [22343] malloc: Integer overflow in posix_memalign
2175 [22347] libc: getrandom() returns the number of bytes that were copied to
2176 the buffer even though the comments say "Return 0 on success and -1 on
2178 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2179 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2181 [22370] dynamic-link: Incorrect note padding check
2182 [22375] libc: malloc returns pointer from tcache_get when should return
2183 NULL (CVE-2017-17426)
2184 [22377] math: iseqsig, float128 and C++
2185 [22382] localedata: Error in tpi_PG locale
2186 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2187 inside the ASCII printable range
2188 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2190 [22403] localedata: Slash needs escaping in some locales
2191 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2192 [22409] network: res_hnok does not accept some host names used on the
2194 [22412] network: res_dnok, res_hnok should perform syntax checks
2195 [22413] network: ns_name_pton ignores syntactically invalid trailing
2197 [22415] stdio: setvbuf can lead to invalid free/segfault
2198 [22432] build: Non-deterministic build
2199 [22439] malloc: malloc_info should compute summary statistics for all sub-
2201 [22442] network: if_nametoindex could report index for the wrong
2202 networking interface
2203 [22446] build: aliasing violation calling readlink in handle_request
2204 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2205 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2206 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2207 __nscd_hash/__nss_hash
2208 [22463] network: p_secstodate overflow handling
2209 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2210 [22478] libc: sigwait can fail with EINTR
2211 [22505] libc: ldconfig processes include directive in locale-specific
2213 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2214 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2215 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2216 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2217 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2218 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2219 same as for Croatian
2220 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2221 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2222 [22577] libc: missing newline after "cannot allocate TLS data structures
2224 [22588] manual: manual/conf.texi: missing underscore in front of
2226 [22593] math: nextafter and nexttoward are declared with const attribute
2227 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2228 [22603] string: ia64 memchr overflows internal pointer check
2229 [22605] libc: SH clone does not set the exit code correctly
2230 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2232 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2233 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2234 modified in case of success
2235 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2236 [22615] manual: manual: ambiguous wording about errno value in case of
2238 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2240 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2241 binaries or if /proc is not mounted (CVE-2017-16997)
2242 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2243 [22630] build: $(no-pie-ldflag) is no longer effective
2244 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2245 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2246 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2247 [22637] nptl: guard size is subtracted from thread stack size instead of
2249 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2250 [22657] localedata: hu_HU: Avoid double space in date
2251 [22660] math: fmax, fmin sNaN handling on alpha
2252 [22664] libc: New warning of GCC8
2253 [22665] math: alpha: ceil and floor raise inexact exceptions
2254 [22666] math: alpha: trunc raise inexact exceptions
2255 [22667] libc: makecontext lacks stack alignment on i386
2256 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2257 [22679] libc: getcwd(3) can succeed without returning an absolute path
2259 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2260 elision and tunables
2261 [22687] math: [powerpc-nofpu] complex long double functions spurious
2263 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2264 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2265 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2267 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2268 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2270 [22701] nis: Incomplete removal of libnsl
2271 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2272 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2273 [22715] dynamic-link: FAIL: elf/tst-audit10
2274 [22719] libc: Backtrace tests fail on hppa
2275 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2276 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2277 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2278 before the first call to crypt_r () in crypt/badsalttest.c
2285 * A per-thread cache has been added to malloc. Access to the cache requires
2286 no locks and therefore significantly accelerates the fast path to allocate
2287 and free small amounts of memory. Refilling an empty cache requires locking
2288 the underlying arena. Performance measurements show significant gains in a
2289 wide variety of user workloads. Workloads were captured using a special
2290 instrumented malloc and analyzed with a malloc simulator. Contributed by
2291 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2293 * Unicode 10.0.0 Support: Character encoding, character type info, and
2294 transliteration tables are all updated to Unicode 10.0.0, using
2295 generator scripts contributed by Mike FABIAN (Red Hat).
2296 These updates cause user visible changes, especially the changes in
2297 wcwidth for many emoji characters cause problems when emoji sequences
2298 are rendered with pango, see for example:
2299 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2301 * Collation of Hungarian has been overhauled and is now consistent with "The
2302 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2305 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2307 - The GNU C Library will now detect when /etc/resolv.conf has been
2308 modified and reload the changed configuration. The new resolver option
2309 “no-reload” (RES_NORELOAD) disables this behavior.
2311 - The GNU C Library now supports an arbitrary number of search domains
2312 (configured using the “search” directive in /etc/resolv.conf);
2313 previously, there was a hard limit of six domains. For backward
2314 compatibility, applications that directly modify the ‘_res’ global
2315 object are still limited to six search domains.
2317 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2318 Library will now randomly pick a name server from the configuration as a
2319 starting point. (Previously, the second name server was always used.)
2321 * The tunables feature is now enabled by default. This allows users to tweak
2322 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2324 * New function reallocarray, which resizes an allocated block (like realloc)
2325 to the product of two sizes, with a guaranteed clean failure upon integer
2326 overflow in the multiplication. Originally from OpenBSD, contributed by
2327 Dennis Wölfing and Rüdiger Sonderfeld.
2329 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2330 These are extended versions of preadv and pwritev, respectively, taking an
2331 additional flags argument. The set of supported flags depends on the
2332 running kernel; full support currently requires kernel 4.7 or later.
2334 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2335 create a new session ID for the spawned process. This feature is
2336 scheduled to be added to the next major revision of POSIX; for the time
2337 being, it is available under _GNU_SOURCE.
2339 * errno.h is now safe to use from C-preprocessed assembly language on all
2340 supported operating systems. In this context, it will only define the
2341 Exxxx constants, as preprocessor macros expanding to integer literals.
2343 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2344 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2345 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2346 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2348 To compile programs that use this feature, the compiler must support
2349 128-bit floating point with the type name _Float128 (as defined by TS
2350 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2351 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2352 must be defined to make the new interfaces visible.
2354 The new functions and macros correspond to those present for other
2355 floating-point types (except for a few obsolescent interfaces not
2356 supported for the new type), with F128 or f128 suffixes; for example,
2357 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2358 printf or scanf formats for the new type; the strfromf128 and strtof128
2359 interfaces should be used instead.
2361 Deprecated and removed features, and other changes affecting compatibility:
2363 * The synchronization that pthread_spin_unlock performs has been changed to
2364 now be equivalent to a C11 atomic store with release memory order to the
2365 spin lock's memory location. Previously, several (but not all)
2366 architectures used stronger synchronization (e.g., containing what is
2367 often called a full barrier). This change can improve performance, but
2368 may affect odd fringe uses of spin locks that depend on the previous
2369 behavior (e.g., using spin locks as atomic variables to try to implement
2370 Dekker's mutual exclusion algorithm).
2372 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2375 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2376 will only be built and installed when the GNU C Library is configured with
2377 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2378 as TIRPC or rpcsvc-proto, to be used.
2380 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2381 libnss_compat, are deprecated, and will not be built or installed by
2384 The NIS(+) support library, libnsl, is also deprecated. By default, a
2385 compatibility shared library will be built and installed, but not headers
2386 or development libraries. Only a few NIS-related programs require this
2387 library. (In particular, the GNU C Library has never required programs
2388 that use 'gethostbyname' to be linked with libnsl.)
2390 Replacement implementations based on TIRPC, which additionally support
2391 IPv6, are available from <https://github.com/thkukuk/>. The configure
2392 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2393 name service modules, to be built and installed.
2395 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2396 support is enabled, the configured recursive resolver must support EDNS.
2397 (Responding to EDNS-enabled queries with responses which are not
2398 EDNS-enabled is fine, but FORMERR responses are not.)
2400 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2401 servers have not supported this opcode for a long time.
2403 * The _res_opcodes variable has been removed from libresolv. It had been
2404 exported by accident.
2406 * <string.h> no longer includes inline versions of any string functions,
2407 as this kind of optimization is better done by the compiler. The macros
2408 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2410 * The nonstandard header <xlocale.h> has been removed. Most programs should
2411 use <locale.h> instead. If you have a specific need for the definition of
2412 locale_t with no other declarations, please contact
2413 libc-alpha@sourceware.org and explain.
2415 * The obsolete header <sys/ultrasound.h> has been removed.
2417 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2419 * The obsolete function cfree has been removed. Applications should use
2422 * The stack_t type no longer has the name struct sigaltstack. This changes
2423 the C++ name mangling for interfaces involving this type.
2425 * The ucontext_t type no longer has the name struct ucontext. This changes
2426 the C++ name mangling for interfaces involving this type.
2428 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2429 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2430 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2431 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2432 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2433 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2434 fpregset_t type no longer has the name struct fpu. This changes the C++
2435 name mangling for interfaces involving those types.
2437 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2438 synced with the kernel:
2440 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2441 are not supported on this architecture and have been removed.
2443 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2444 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2445 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2447 Programs that assume the GET/SETREGS ptrace requests are universally
2448 available will now fail to build, instead of malfunctioning at runtime.
2450 Changes to build and runtime requirements:
2452 * Linux kernel 3.2 or later is required at runtime, on all architectures
2453 supported by that kernel. (This is a change from version 2.25 only for
2456 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2458 * On most architectures, GCC 4.9 or later is required to build the GNU C
2459 Library. On powerpc64le, GCC 6.2 or later is required.
2461 Older GCC versions and non-GNU compilers are still supported when
2462 compiling programs that use the GNU C Library. (We do not know exactly
2463 how old, and some GNU extensions to C may be _de facto_ required. If you
2464 are interested in helping us make this statement less vague, please
2465 contact libc-alpha@sourceware.org.)
2467 Security related changes:
2469 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2470 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2472 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2473 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2475 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2476 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2479 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2480 fixed (CVE-2017-12133).
2482 The following bugs are resolved with this release:
2484 [984] network: Respond to changed resolv.conf in gethostbyname
2485 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2486 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2488 [12189] libc: __stack_chk_fail should not attempt a backtrace
2490 [14096] time: Race condition on timezone/tst-timezone.out
2491 [14172] localedata: az_IR: new locale
2492 [14995] build: glibc fails to build if gold is the default linker, even if
2494 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2495 [16637] network: inet_pton function is accepting IPv6 with bad format
2496 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2497 x86 and other generic code
2498 [16875] localedata: ko_KR: fix lang_name
2499 [17225] localedata: ar_SY: localized month names for May and June are
2501 [17297] localedata: da_DK: wrong date_fmt string
2502 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2503 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2504 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2505 [19066] localedata: ar_SA abbreviated day and month names are in English
2506 [19569] network: resolv: Support an arbitrary number of search domains
2507 [19570] network: Implement random DNS server selection in the stub
2509 [19838] locale: localedef fails on PA-RISC
2510 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2511 order of 0D36 and 0D37
2512 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2514 [20098] libc: FAIL: debug/backtrace-tst on hppa
2515 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2517 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2519 [20313] localedata: Update locale data to Unicode 9.0
2520 [20424] manual: Document how to provide a malloc replacement
2521 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2523 [20686] locale: Add el_GR@euro to SUPPORTED.
2524 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2525 failures consistently
2526 [21015] dynamic-link: Document and fix --enable-bind-now
2527 [21016] nptl: pthread_cond support is broken on hppa
2528 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2529 frame-pointer on i386
2530 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2532 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2533 [21088] libc: Build fails with --enable-static-nss
2534 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2535 generic c code is used
2536 [21109] libc: Tunables broken on big-endian
2537 [21112] math: powf has large ulp errors with base close to 1 and exponent
2539 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2541 [21120] malloc: glibc malloc is incompatible with GCC 7
2542 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2544 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2545 (-0.0) when linking with -lieee
2546 [21171] math: log10, log2 and lgamma return incorrect results
2547 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2548 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2549 [21207] localedata: ce_RU: update weekdays from CLDR
2550 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2551 [21217] localedata: Update months from CLDR-31
2552 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2553 [21243] libc: support_delete_temp_file should issue warning for failed
2555 [21244] libc: support resolv_test_start() socket fd close should be
2557 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2558 new posix_spawn implementation
2559 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2560 leads to lower CPU frequency
2561 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2562 [21261] libc: [sparc64] bits/setjmp.h namespace
2563 [21267] network: [mips] bits/socket.h IOC* namespace
2564 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2565 [21270] libc: mmap64 silently truncates large offset values
2566 [21275] libc: posix_spawn always crashes on ia64 now
2567 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2568 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2569 [21289] libc: Incorrect declaration for 32-bit platforms with
2570 _FILE_OFFSET_BITS=64 causes build error
2571 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2572 not support gethostbyname4_r
2573 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2575 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2577 [21340] libc: Support POSIX_SPAWN_SETSID
2578 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2579 [21359] network: ns_name_pack needs additional byte in destination buffer
2580 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2581 against fragmentation attacks (CVE-2017-12132)
2582 [21369] network: resolv: Remove EDNS fallback
2583 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2585 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2586 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2587 [21393] stdio: Missing dup3 error check in freopen, freopen64
2588 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2589 [21399] localedata: Bad description for U00EC in
2590 localedata/charmaps/CP1254
2591 [21411] malloc: realloc documentation error
2592 [21426] network: sys/socket.h uio.h namespace
2593 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2594 [21445] libc: signal.h bsd_signal namespace
2595 [21455] network: Network headers stdint.h namespace
2596 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2598 [21475] network: resolv: Overlong search path is truncated mid-label
2599 [21511] libc: sigstack namespace
2600 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2601 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2602 bits/syscall.h: No such file or directory
2603 [21517] libc: struct sigaltstack namespace
2604 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2605 [21533] localedata: Update locale data to Unicode 10.0
2607 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2608 junk at end of line, first unrecognized character is `@'
2609 [21538] libc: SIG_HOLD missing for XPG4
2610 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2611 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2612 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2613 [21543] libc: sigevent namespace
2614 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2615 size for general purpose registers in mcontext_t structure
2616 [21550] libc: sigwait namespace
2617 [21552] libc: XPG4 bsd_signal namespace
2618 [21554] libc: sigpause namespace
2619 [21560] libc: sys/wait.h signal.h namespace
2620 [21561] libc: waitid namespace
2621 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2622 '/usr/include/stdlib.h': Permission denied
2623 [21575] libc: sys/wait.h missing struct rusage definition
2624 [21584] libc: sigaltstack etc namespace
2625 [21597] libc: siginterrupt namespace
2626 [21607] math: hppa: FAIL: math/test-tgmath
2627 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2629 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2630 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2631 stack and heap (CVE-2017-1000366)
2632 [21625] libc: wait3 namespace
2633 [21654] nss: Incorrect pointer alignment in NSS group merge result
2635 [21657] network: Parse interface zone id for node-local multicast
2636 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2638 [21666] libc: .symver is used on common symbol
2639 [21668] network: resolv: res_init cross-thread broadcast introduces race
2641 [21687] math: tgmath.h totalorder, totalordermag return type
2642 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2644 [21696] libc: Incorrect assumption of of __cpu_mask in
2645 posix/sched_cpucount.c
2646 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2647 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2649 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2650 leading to relocation crash
2651 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2652 `resolv_conf_matches (resp, conf)' failed.
2653 [21710] localedata: Added Samoan language locale for Samoa
2654 [21711] localedata: Pashto yesstr/nostr locale are missing
2655 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2656 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2657 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2658 [21723] localedata: yesstr/nostr missing for Chinese language locale
2659 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2661 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2663 [21728] localedata: New Locale for Tongan language
2664 [21729] localedata: incorrect LC_NAME fields for hi_IN
2665 [21733] localedata: yesstr and nostr are missing for zh_HK
2666 [21734] localedata: Missing yesstr and nostr are for kw_GB
2667 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2668 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2669 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2670 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2672 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2674 [21749] localedata: Wrong abbreviated day name (“abday”) for
2676 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2677 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2678 [21759] localedata: missing yesstr and nostr for Tigrinya
2679 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2680 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2681 [21767] localedata: Missing Bislama locales
2682 [21768] localedata: Missing yesstr and nostr for aa_ET
2683 [21770] localedata: Missing Field in li_NL
2684 [21778] nptl: Robust mutex may deadlock
2685 [21779] libc: MicroBlaze segfaults when loading libpthread
2686 [21783] localedata: Fix int_select international_call_prefixes
2687 [21784] localedata: Inconsistency in country_isbn
2688 [21788] localedata: Missing Country Postal Abbreviations
2689 [21794] localedata: Added-country_isbn-for-Italy
2690 [21795] localedata: Add/Fix country_isbn for France
2691 [21796] localedata: Added country_isbn for Republic of Korea
2692 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2693 [21799] localedata: Added int_select international_call_prefixes
2694 [21801] localedata: Added int_select international_call_prefixes
2695 [21804] nptl: Double semicolon in thread-shared-types.h
2696 [21807] localedata: LC_ADDRESS fix for pap_CW
2697 [21808] localedata: Fix LC_ADDRESS for pap_AW
2698 [21821] localedata: Added country_name in mai_IN
2699 [21822] localedata: Fix LC_TIME for mai_IN
2700 [21823] localedata: missing yesstr, nostr for sa_IN
2701 [21825] localedata: Fix name_mrs for mag_IN
2702 [21828] localedata: 2.26 changelog should mention user visible changes
2704 [21835] localedata: Added Maithili language locale for Nepal
2705 [21838] localedata: Removed redundant data for the_NP
2706 [21839] localedata: Fix LC_MONETARY for ta_LK
2707 [21844] localedata: Fix Latin characters and Months Sequence.
2708 [21848] localedata: Fix mai_NP Title Name
2713 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2714 24731-2:2010, is supported to enable declarations of functions from that
2715 TR. Note that not all functions from that TR are supported by the GNU C
2718 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2719 18661-1:2014, is supported to enable declarations of functions and macros
2720 from that TS. Note that not all features from that TS are supported by
2723 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2724 18661-4:2015, is supported to enable declarations of functions and macros
2725 from that TS. Note that most features from that TS are not supported by
2728 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2729 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2730 Since the GNU C Library defaults to a much newer revision of POSIX, this
2731 will only affect programs that specifically request an old conformance
2732 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2733 see a change in the visible declarations, but a program compiled with
2734 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2737 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2738 defined by all multithreaded code, but glibc has not required this for
2741 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2742 means that in a future release, the macros “major”, “minor”, and “makedev”
2743 will only be available from <sys/sysmacros.h>.
2745 These macros are not part of POSIX nor XSI, and their names frequently
2746 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2747 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2748 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2751 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2752 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2753 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2755 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2756 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2757 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2758 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2759 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2760 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2761 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2762 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2763 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2764 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2765 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2768 * New <math.h> features are added from TS 18661-1:2014:
2770 - Signaling NaN macros: SNANF, SNAN, SNANL.
2772 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2773 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2774 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2776 - llogb functions: the llogb, llogbf and llogbl functions, and the
2777 FP_LLOGB0 and FP_LLOGBNAN macros.
2779 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2782 - Comparison macros: iseqsig.
2784 - Classification macros: iscanonical, issubnormal, iszero.
2786 - Total order functions: totalorder, totalorderf, totalorderl,
2787 totalordermag, totalordermagf, totalordermagl.
2789 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2791 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2792 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2794 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2795 are added to libc. They convert a floating-point number into string.
2797 * Most of glibc can now be built with the stack smashing protector enabled.
2798 It is recommended to build glibc with --enable-stack-protector=strong.
2799 Implemented by Nick Alcock (Oracle).
2801 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2802 intended to be used instead of memset() to erase sensitive data after use;
2803 the compiler will not optimize out calls to explicit_bzero even if they
2804 are "unnecessary" (in the sense that no _correct_ program can observe the
2805 effects of the memory clear).
2807 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2808 to float instead of double. This does not affect the ABI of any libraries
2809 that are part of the GNU C Library, but may affect the ABI of other
2810 libraries that use this type in their interfaces.
2812 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2813 float_t and double_t types are now defined to long double instead of float
2814 and double. These options are not the default, and this does not affect
2815 the ABI of any libraries that are part of the GNU C Library, but it may
2816 affect the ABI of other libraries that use this type in their interfaces,
2817 if they are compiled or used with those options.
2819 * The getentropy and getrandom functions, and the <sys/random.h> header file
2822 * The buffer size for byte-oriented stdio streams is now limited to 8192
2823 bytes by default. Previously, on Linux, the default buffer size on most
2824 file systems was 4096 bytes (and thus remains unchanged), except on
2825 network file systems, where the buffer size was unpredictable and could be
2826 as large as several megabytes.
2828 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2829 for the Linux quota interface which predates kernel version 2.4.22 has
2832 * The malloc_get_state and malloc_set_state functions have been removed.
2833 Already-existing binaries that dynamically link to these functions will
2834 get a hidden implementation in which malloc_get_state is a stub. As far
2835 as we know, these functions are used only by GNU Emacs and this change
2836 will not adversely affect already-built Emacs executables. Any undumped
2837 Emacs executables, which normally exist only during an Emacs build, should
2838 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2840 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2841 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2842 “no-ip6-dotint” had already been the default, and support for the
2843 “ip6-dotint” option was removed from the Internet in 2006.
2845 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2846 flag from <resolv.h> have been removed. The option relied on a
2847 backwards-incompatible DNS extension which was never deployed on the
2850 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2851 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2852 They were already unimplemented.
2854 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2855 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2856 removed again from the IETF name lookup interface specification in RFC
2857 2553. Applications should use getaddrinfo instead.
2859 * DNSSEC-related declarations and definitions have been removed from the
2860 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2861 decode the data part of DNSSEC record types. Previous versions of glibc
2862 only implemented minimal support for the previous version of DNSSEC, which
2863 is incompatible with the currently deployed version.
2865 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2866 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2867 <arpa/nameser.h> header file because the distinction between RR types and
2868 meta-RR types is not officially standardized, subject to revision, and
2869 thus not suitable for encoding in a macro.
2871 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2872 and rhook members of the res_state type in <resolv.h> have been removed.
2873 The glibc stub resolver did not support these hooks, but the header file
2874 did not reflect that.
2876 * For multi-arch support it is recommended to use a GCC which has
2877 been built with support for GNU indirect functions. This ensures
2878 that correct debugging information is generated for functions
2879 selected by IFUNC resolvers. This support can either be enabled by
2880 configuring GCC with '--enable-gnu-indirect-function', or by
2881 enabling it by default by setting 'default_gnu_indirect_function'
2882 variable for a particular architecture in the GCC source file
2885 * GDB pretty printers have been added for mutex and condition variable
2886 structures in POSIX Threads. When installed and loaded in gdb these pretty
2887 printers show various pthread variables in human-readable form when read
2888 using the 'print' or 'display' commands in gdb.
2890 * Tunables feature added to allow tweaking of the runtime for an application
2891 program. This feature can be enabled with the '--enable-tunables' configure
2892 flag. The GNU C Library manual has details on usage and README.tunables has
2893 instructions on adding new tunables to the library.
2895 * A new version of condition variables functions have been implemented in
2896 the NPTL implementation of POSIX Threads to provide stronger ordering
2899 * A new version of pthread_rwlock functions have been implemented to use a more
2900 scalable algorithm primarily through not using a critical section anymore to
2903 Security related changes:
2905 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2906 have been created with makecontext could fail to terminate due to a
2907 missing .cantunwind annotation. This has been observed to lead to a hang
2908 (denial of service) in some Go applications compiled with gccgo. Reported
2909 by Andreas Schwab. (CVE-2016-6323)
2911 * The DNS stub resolver functions would crash due to a NULL pointer
2912 dereference when processing a query with a valid DNS question type which
2913 was used internally in the implementation. The stub resolver now uses a
2914 question type which is outside the range of valid question type values.
2917 The following bugs are resolved with this release:
2919 [4099] stdio: Overly aggressive caching by stream i/o functions.
2920 [7065] build: Support building glibc with -fstack-protector or -fstack-
2922 [9842] localedata: en_CA: incorrect date format
2923 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2924 before it started waiting
2925 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2926 [15765] nptl: sem_open is wrongly a cancellation point
2927 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2928 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2930 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2931 library linked with pthread
2932 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2933 "FIXME: Ingo" issue)
2934 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2935 [17252] libc: getrandom and getentropy syscall
2936 [17730] malloc: thread-local storage is sometimes improperly free()'d
2937 after being __libc_memalign()'d
2938 [18241] stdio: failed fseek on memstream does not set errno and can fail
2940 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2942 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2943 PTHREAD_PRIO_INHERIT mutex on ARM
2944 [18784] network: res_query and related function crash for special record
2945 type queries (CVE-2015-5180)
2946 [19380] math: strtod does not raise "inexact"
2947 [19387] string: Integer overflow in memchr
2948 [19390] string: Integer overflow in strncat
2949 [19398] build: linknamespace tests fail with massively parallel build
2950 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2952 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2953 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2954 [19514] libc: [PATCH] Fix spelling errors in spelling
2955 "implement"/"implementation" in several places
2956 [19582] network: Deprecate RES_USE_INET6
2957 [19673] manual: clog10 docs appear to be erroneous
2958 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2959 causes a segmentation fault
2960 [19826] libc: invalid pointer returned from __tls_get_addr with static
2962 [20016] network: resolv: Remove hooks support from the API
2963 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2965 [20033] math: [x86_64] vectorized math function don't call the __finite
2967 [20116] nptl: use after free in pthread_create
2968 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2969 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2971 [20311] nptl: please install proc_service.h
2972 [20366] libc: Compilation errors in installed headers in strict-compliance
2974 [20370] malloc: malloc: Arena free list management is still racy
2975 (incorrect fix in bug 19243)
2976 [20386] libc: assert (X = 0) does not result in GCC warning
2977 [20432] malloc: malloc: Minimize interface required for interposition
2978 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2979 in _Unwind_Backtrace (CVE-2016-6323)
2980 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2981 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2983 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2984 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2985 [20477] network: resolv: incorrect double-checked locking related to
2987 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2989 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2991 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2992 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2993 cause transition penalty
2994 [20517] math: sparcv9 missing fdiml compat symbol
2995 [20524] manual: strverscmp is inconsistent
2996 [20525] libc: <sys/quota.h> should be based on kernel headers
2997 [20539] math: GCC 7 -static -lm fails to link at -O3
2998 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3000 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3002 [20591] network: Remove obsolete DNSSEC support
3003 [20592] network: DNS resource record type classification macros in
3004 <arpa/nameser.h> are incorrect
3005 [20593] network: Update DNS RR type definitions
3006 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3007 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3009 [20629] network: libresolv: Remove support for bitstring labels
3011 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3012 assertion: "maxidx >= 2"
3013 [20660] math: [arm] Use VSQRT
3014 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3015 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3016 [20689] libc: Test for FMA should also check for AVX.
3017 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3018 [20715] math: iszero macro breaks existing code
3019 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3020 [20728] libc: powerpc: Missing TOC stub in clone
3021 [20729] build: glibc-2.24 fails to build for i486 with -Os
3022 [20750] build: Build fails with default PIE enabled gcc-6.x
3023 [20768] math: [alpha] sqrt fegetenv namespace
3024 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3026 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3027 __FLT_EVAL_METHOD__ is 2
3028 [20790] network: rpcgen buffer overrun in get_prog_declaration
3029 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3030 [20829] libc: crypt snprintf namespace
3031 [20847] libc: tst-vfork3 failure
3032 [20855] math: Default bits/mathdef.h has inappropriate float_t
3033 [20859] math: [sh4] FP_ILOGB0 invalid
3034 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3035 U+20AC), not same as GBK
3036 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3037 [20916] math: pow handling of sNaN arguments
3038 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3039 [20919] math: Bad pow (qNaN, 0) result with -lieee
3040 [20940] math: hypot sNaN handling
3041 [20947] math: fmax, fmin sNaN handling
3042 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3043 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3045 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3046 [20973] nptl: robust mutexes: Lost wake-ups
3047 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3048 [20978] nis: strlen on null pointer in nss_nisplus
3049 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3051 [21014] string: i686 memchr overflows internal pointer check
3052 [21019] libc: [mips] n32 lseek incorrect on overflow
3053 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3054 [21026] libc: [MIPS] readahead syscall is broken on n64
3055 [21028] math: Fallback fesetexceptflag should always succeed
3056 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3057 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3059 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3060 [21061] librt: [microblaze] librt lost clock_* exports
3061 [21073] libc: tunables: insecure environment variables passed to
3062 subprocesses with AT_SECURE
3063 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3067 * The minimum Linux kernel version that this version of the GNU C Library
3068 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3069 kernel version 2.6.32 or later suffices (on architectures that already
3070 required kernel versions more recent than 3.2, those requirements remain
3071 unchanged). Linux 3.2 or later kernel headers are required on all
3074 * The pap_AN locale has been deleted. This has been deprecated for a long
3075 time. It has been replaced by pap_AW & pap_CW, both of which have long
3076 been included in previous releases.
3078 * The readdir_r and readdir64_r functions have been deprecated. It is
3079 recommended to use readdir and readdir64 instead.
3081 * The type “union wait” has been removed. It was deprecated in the early
3082 1990s and never part of POSIX. Application code should use the int type
3083 instead of “union wait”.
3085 * A new NSS action is added to facilitate large distributed system
3086 administration. The action, MERGE, allows remote user stores like LDAP
3087 to be merged into local user stores like /etc/groups in order to provide
3088 easy to use, updated, and managed sets of merged credentials. The new
3089 action can be used by configuring it in /etc/nsswitch.conf:
3090 group: files [SUCCESS=merge] nis
3091 Implemented by Stephen Gallagher (Red Hat).
3093 * The deprecated __malloc_initialize_hook variable has been removed from the
3096 * The long unused localedef --old-style option has been removed. It hasn't
3097 done anything in over 16 years. Scripts using this option can safely
3100 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3101 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3102 return the next representable value in the direction of positive infinity
3103 and the nextdown functions return the next representable value in the
3104 direction of negative infinity. These are currently enabled as GNU
3107 Security related changes:
3109 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3110 could result in a stack overflow when getnetbyname was called with an
3111 overly long name. (CVE-2016-3075)
3113 * Previously, getaddrinfo copied large amounts of address data to the stack,
3114 even after the fix for CVE-2013-4458 has been applied, potentially
3115 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3116 instead. Reported by Michael Petlan. (CVE-2016-3706)
3118 * The glob function suffered from a stack-based buffer overflow when it was
3119 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3120 Reported by Alexander Cherepanov. (CVE-2016-1234)
3122 * The Sun RPC UDP client could exhaust all available stack space when
3123 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3124 alloca plugin for GCC. (CVE-2016-4429)
3126 * The IPv6 name server management code in libresolv could result in a memory
3127 leak for each thread which is created, performs a failing naming lookup,
3128 and exits. Over time, this could result in a denial of service due to
3129 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3131 The following bugs are resolved with this release:
3133 [1170] localedata: ne_NP: update Nepali locale definition file
3134 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3136 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3137 [6796] math: fdim() does not set errno on overflow
3138 [10354] libc: posix_spawn should use vfork() in more cases than presently
3139 [11213] localedata: localedata: add copyright disclaimer to locale files
3140 [12143] localedata: chr_US: new Cherokee locale
3141 [12450] localedata: sgs_LT: new locale
3142 [12676] localedata: ln_CD: new locale
3143 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3145 [13304] math: fma, fmaf, fmal produce wrong results
3146 [14259] build: --localedir arg to configure is ignored
3147 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3148 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3149 [14934] localedata: es_CL: wrong first weekday chilean locale
3150 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3152 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3154 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3155 [15368] nptl: raise() is not async-signal-safe
3156 [15479] math: ceil, floor, round and trunc raise inexact exception
3157 [15578] localedata: kk_KZ: various updates
3158 [16003] localedata: pap_AN: punt old locale
3159 [16137] localedata: iw_IL: punt old locale
3160 [16190] localedata: eo: new esperanto locale
3161 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3162 [16742] malloc: race condition: pthread_atfork() called before first
3163 malloc() results in unexpected locking behaviour/deadlocks
3164 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3166 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3167 [17565] localedata: pt_PT: wrong (work-)week start
3168 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3169 [17950] build: Build fails with -msse
3170 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3171 [18433] libc: posix_spawn does not return correctly upon failure to
3173 [18453] localedata: charmaps/IBM875: incorrect codes
3174 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3176 [18896] localedata: he_IL: improvements for currency
3177 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3178 Romanian locale data
3179 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3181 [19056] libc: Deprecate readdir_r
3182 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3184 [19198] localedata: nl_NL: small improvements for Dutch locales
3185 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3186 nameservers (CVE-2016-5417)
3187 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3189 [19400] locale: Language missing in "iso-639.def", trivial fix in
3191 [19431] malloc: Deadlock between fflush, getdelim, and fork
3192 [19505] libc: Incorrect file descriptor validity checks in
3193 posix_spawn_file_actions_add{open,close,dup2}
3194 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3195 when using RTLD_NEXT
3196 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3197 `intl/{gettextP,loadinfo}.h'
3198 [19534] libc: execle, execlp may use malloc
3199 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3200 [19573] network: res_nclose and __res_maybe_init disagree about name
3201 server initialization, breaking Hesiod
3202 [19575] localedata: Status of GB18030 tables
3203 [19581] localedata: sr_* date_fmt string contains additional newline
3204 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3206 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3207 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3208 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3209 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3211 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3213 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3215 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3216 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3217 [19633] locale: strfmon_l applies global locale to number formatting
3218 [19642] network: Memory leak in getnameinfo
3219 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3220 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3222 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3223 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3225 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3226 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3228 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3230 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3232 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3233 pointers and lengths in error-case.
3234 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3235 report errors on UTF-16 surrogates values.
3236 [19755] nscd: nscd assertion failure in gc
3237 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3238 [19759] libc: mempcpy shouldn't be inlined
3239 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3240 [19765] libc: s390 needs an optimized mempcpy
3241 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3242 NAME_MAX limit assumption (CVE-2016-1234)
3243 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3244 [19787] network: Missing and incorrect truncation checks in getnameinfo
3245 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3247 [19791] network: Assertion failure in res_query.c with un-connectable name
3249 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3250 [19822] math: libm.so install clobbers old version
3251 [19825] network: resolv: send_vc can return uninitialized data in second
3252 response to getaddrinfo
3253 [19830] network: nss_dns: should check RDATA length against buffer length
3254 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3255 confronted with A/AAAA records of invalid size
3256 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3257 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3258 [19853] stdio: Printing IBM long double in decimal with high precision is
3260 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3261 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3262 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3264 [19865] network: Assertion failure or memory leak in
3265 _nss_dns_getcanonname_r
3266 [19868] network: nss_dns: netent code does not skip over non-PTR records
3267 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3269 [19881] string: Improve x86-64 memset
3270 [19907] string: Incorrect memcpy tests
3271 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3273 [19925] libc: termios.h XCASE namespace
3274 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3275 [19929] libc: limits.h NL_NMAX namespace
3276 [19931] stdio: Memory leak in vfprintf
3277 [19957] libc: clone(CLONE_VM) access invalid parent memory
3278 [19963] localedata: en_IL: New locale
3279 [19989] stdio: stdio.h cuserid namespace
3280 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3282 [19996] locale: langinfo.h nl_langinfo_l namespace
3283 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3284 [20010] network: getaddrinfo: Stack overflow in hostent translation
3286 [20012] stdio: libio: fmemopen append mode failure
3287 [20014] stdio: stdio.h namespace for pre-threads POSIX
3288 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3289 [20023] libc: fcntl.h timespec namespace
3290 [20024] math: [x86_64] vectorized sincos trashes the stack
3291 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3292 [20041] time: sys/time.h timespec namespace
3293 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3294 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3295 [20051] libc: ttyslot in wrong header under wrong conditions
3296 [20054] libc: gethostname not declared for XPG4
3297 [20055] libc: termios.h missing tcgetsid for XPG4
3298 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3300 [20073] libc: sys/stat.h fchmod namespace
3301 [20074] libc: stdlib.h rand_r namespace
3302 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3303 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3305 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3306 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3308 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3309 [20119] libc: Wrong mask for processors level type from CPUID
3310 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3311 AS not supporting AVX512
3312 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3314 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3315 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3317 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3318 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3319 [20178] libc: posix_spawn{p} should not call exit
3320 [20191] stdio: libio: vtables hardening
3321 [20195] string: FMA4 detection requires CPUID execution with register
3323 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3324 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3326 [20212] math: acos (sNaN) returns sNaN
3327 [20213] math: asin (sNaN) returns sNaN
3328 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3329 [20218] math: [i386] asinhl (sNaN) returns sNaN
3330 [20219] math: [i386] atanhl (sNaN) returns sNaN
3331 [20222] stdio: fopencookie: Mangle function pointers
3332 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3333 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3334 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3336 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3337 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3338 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3339 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3340 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3341 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3342 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3343 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3344 [20240] math: modf (sNaN) returns sNaN
3345 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3346 [20250] math: frexp (sNaN) returns sNaN
3347 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3348 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3350 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3351 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3352 subscript is below array bounds [-Werror=array-bounds]
3353 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3354 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3356 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3357 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3359 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3360 "invalid" exceptions
3361 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3362 [20316] localedata: id_ID: Februari instead of Pebruari
3363 [20327] string: POWER8 strcasecmp returns incorrect result
3364 [20347] math: Failure: Test: j0_downward (0xap+0)
3365 [20348] libc: FAIL: misc/tst-preadvwritev64
3366 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3367 [20350] libc: There is no test for p{read,write}64
3368 [20357] math: Incorrect cos result for 1.5174239687223976
3369 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3373 * Unicode 8.0.0 Support: Character encoding, character type info, and
3374 transliteration tables are all updated to Unicode 8.0.0, using new
3375 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3376 These updates cause user visible changes, such as the fixes for bugs
3377 89, 16061, and 18568.
3379 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3380 kernel-internal CPU set size. This means that requests that change the
3381 CPU affinity which failed before (for example, an all-ones CPU mask) will
3382 now succeed. Applications that need to determine the effective CPU
3383 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3384 setting it because the kernel can adjust it (and the previous size check
3385 would not detect this in the majority of cases).
3387 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3388 the following new symbols are used: fts64_children, fts64_close,
3389 fts64_open, fts64_read and fts64_set.
3391 * getaddrinfo now detects certain invalid responses on an internal netlink
3392 socket. If such responses are received, an affected process will
3393 terminate with an error message of "Unexpected error <number> on netlink
3394 descriptor <number>" or "Unexpected netlink response of size <number> on
3395 descriptor <number>". The most likely cause for these errors is a
3396 multi-threaded application which erroneously closes and reuses the netlink
3397 file descriptor while it is used by getaddrinfo.
3399 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3400 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3401 unnecessary serialization of memory allocation requests across threads.
3402 The defect is now corrected. Users should see a substantial increase in
3403 the concurent throughput of allocation requests for applications which
3404 trigger this bug. Affected applications typically create and
3405 destroy threads frequently. (Bug 19048 was reported and analyzed by
3408 * There is now a --disable-timezone-tools configure option for disabling the
3409 building and installing of the timezone related utilities (zic, zdump, and
3410 tzselect). This is useful for people who build the timezone data and code
3411 independent of the GNU C Library.
3413 * The obsolete header <regexp.h> has been removed. Programs that require
3414 this header must be updated to use <regex.h> instead.
3416 * The obsolete functions bdflush, create_module, get_kernel_syms,
3417 query_module and uselib are no longer available to newly linked binaries;
3418 the header <sys/kdaemon.h> has been removed. These functions and header
3419 were specific to systems using the Linux kernel and could not usefully be
3420 used with the GNU C Library on systems with version 2.6 or later of the
3423 * Optimized string, wcsmbs and memory functions for IBM z13.
3424 Implemented by Stefan Liebler.
3426 * Newly linked programs that define a variable called signgam will no longer
3427 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3428 require signgam to be set by those functions must ensure that they use the
3429 variable provided by the GNU C Library and declared in <math.h>, without
3430 defining their own copy.
3432 * The minimum GCC version that can be used to build this version of the GNU
3433 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3434 still be used to compile programs using the GNU C Library.
3436 Security related changes:
3438 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3439 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3441 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3442 the pointer guard feature. It is always enabled. Previously,
3443 LD_POINTER_GUARD could be used to disable security hardening in binaries
3444 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3447 * An integer overflow in hcreate and hcreate_r could lead to an
3448 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3450 * The catopen function no longer has unbounded stack usage. Reported by
3451 Max. (CVE-2015-8779)
3453 * The nan, nanf and nanl functions no longer have unbounded stack usage
3454 depending on the length of the string passed as an argument to the
3455 functions. Reported by Joseph Myers. (CVE-2014-9761)
3457 * A stack-based buffer overflow was found in libresolv when invoked from
3458 libnss_dns, allowing specially crafted DNS responses to seize control
3459 of execution flow in the DNS client. The buffer overflow occurs in
3460 the functions send_dg (send datagram) and send_vc (send TCP) for the
3461 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3462 family. The use of AF_UNSPEC triggers the low-level resolver code to
3463 send out two parallel queries for A and AAAA. A mismanagement of the
3464 buffers used for those queries could result in the response of a query
3465 writing beyond the alloca allocated buffer created by
3466 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3467 the overflow. Thanks to the Google Security Team and Red Hat for
3468 reporting the security impact of this issue, and Robert Holiday of
3469 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3471 The following bugs are resolved with this release:
3473 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3474 [887] math: Math library function "logb" and "nextafter" inconsistent
3475 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3476 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3477 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3478 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3480 [4404] localedata: German translation of "Alarm clock" is misleading
3481 [6799] math: nextafter() and nexttoward() doen't set errno on
3482 overflow/underflow errors
3483 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3485 [10432] nis: _nss_nis_setnetgrent assertion failure
3486 [11460] libc: fts has no LFS support
3487 [12926] network: getaddrinfo()/make_request() may spin forever
3488 [13065] nptl: Race condition in pthread barriers
3489 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3490 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3492 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3493 [14912] libc: Rename non-installed bits/*.h headers
3494 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3495 [15367] math: Let gcc use __builtin_isinf
3496 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3497 [15421] math: lgamma wrongly sets signgam for ISO C
3498 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3499 FE_INVALID with argument out of range
3500 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3502 [15786] dynamic-link: ifunc resolver functions can smash function
3504 [15918] math: Unnecessary check for equality in hypotf()
3505 [16061] localedata: Review / update transliteration data
3506 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3508 [16141] time: strptime %z offset restriction
3509 [16171] math: drem should be alias of remainder
3510 [16296] math: fegetround is pure?
3511 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3512 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3514 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3515 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3517 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3518 "Exception "Inexact" set" on ppc32
3519 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3520 [16517] math: Missing underflow exception from tanf/tan/tanl
3521 [16519] math: Missing underflow exception from sinhf
3522 [16520] math: Missing underflow exception from tanhf
3523 [16521] math: Missing underflow exception from exp2
3524 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3526 [16734] stdio: fopen calls mmap to allocate its buffer
3527 [16961] math: nan function incorrect handling of bad sequences
3528 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3529 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3530 [16985] locale: localedef: confusing error message when opening output
3532 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3533 [17197] locale: Redundant shift character in iconv conversion output at
3535 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3536 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3537 [17250] dynamic-link: static linking breaks nss loading
3538 (getaddrinfo/getpwnam/etc...)
3539 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3541 [17441] math: isnan() should use __builtin_isnan() in GCC
3542 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3543 (related to lock elision)
3544 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3545 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3546 [17887] time: strptime should be able to parse "+01:00" style timezones
3547 [17905] libc: catopen() Multiple unbounded stack allocations
3549 [18084] libc: backtrace (..., 0) dumps core on x86
3550 [18086] libc: nice() sets errno to 0 on success
3551 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3552 is too large (CVE-2015-8778)
3553 [18251] dynamic-link: SONAME missing when audit modules provides path
3554 [18265] libc: add attributes for wchar string and memory functions
3555 [18370] math: csqrt missing underflows
3556 [18421] libc: [hppa] read-only segment has dynamic relocations
3557 [18472] libc: Obsolete syscall wrappers should be compat symbols
3558 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3559 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3560 [18525] localedata: Remove locale timezone information
3561 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3562 [18568] localedata: Update locale data to Unicode 8.0
3563 [18589] locale: sort-test.sh fails at random
3564 [18595] math: ctan, ctanh missing underflows
3565 [18604] libc: assert macro-expands its argument
3566 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3567 contains a vector instruction exception.
3568 [18611] math: j1, jn missing errno setting on underflow
3569 [18618] localedata: sync Chechen locale definitions with other *_RU
3571 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3572 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3573 [18665] network: In send_dg, the recvfrom function is NOT always using the
3574 buffer size of a newly created buffer (CVE-2015-7547)
3575 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3577 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3579 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3580 [18699] math: tilegx cproj() for various complex infinities does not yield
3582 [18724] libc: Harden put*ent functions against data injection
3583 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3584 [18755] build: build errors with -DNDEBUG
3585 [18757] stdio: fmemopen fails to set errno on failure
3586 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3588 [18781] libc: openat64 lacks O_LARGEFILE
3589 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3590 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3591 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3592 [18790] math: [ldbl-128ibm] tanhl inaccurate
3593 [18795] libc: stpncpy fortification misses buffer lengths that are
3594 statically too large
3595 [18796] build: build fails for --disable-mathvec
3596 [18803] math: hypot missing underflows
3597 [18820] stdio: fmemopen may leak memory on failure
3598 [18823] math: csqrt spurious underflows
3599 [18824] math: fma spurious underflows
3600 [18825] math: pow missing underflows
3601 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3602 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3603 [18870] build: sem_open.c fails to compile with missing symbol
3605 [18872] stdio: Fix memory leak in printf_positional
3606 [18873] libc: posix_fallocate overflow check ineffective
3607 [18875] math: Excess precision leads incorrect libm
3608 [18877] libc: arm: mmap offset regression
3609 [18887] libc: memory corruption when using getmntent on blank lines
3610 [18918] localedata: hu_HU: change time to HH:MM:SS format
3611 [18921] libc: Regression: extraneous stat() and fstat() performed by
3613 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3614 binaries (CVE-2015-8777)
3615 [18951] math: tgamma missing underflows
3616 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3618 [18953] localedata: lt_LT: change currency symbol to the euro
3619 [18956] math: powf inaccuracy
3620 [18961] math: [i386] exp missing underflows
3621 [18966] math: [i386] exp10 missing underflows
3622 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3623 [18969] build: multiple string test failures due to missing locale
3625 [18970] libc: Reference of pthread_setcancelstate in libc.a
3626 [18977] math: float / long double Bessel functions not in XSI POSIX
3627 [18980] math: i386 libm functions return with excess range and precision
3628 [18981] math: i386 scalb*, ldexp return with excess range and precision
3629 [18982] stdio: va_list and vprintf
3630 [18985] time: Passing out of range data to strftime() causes a segfault
3632 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3633 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3634 [19012] locale: iconv_open leaks memory on error path
3635 [19016] math: clog, clog10 inaccuracy
3636 [19018] nptl: Mangle function pointers in tls_dtor_list
3637 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3638 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3639 [19048] malloc: malloc: arena free list can become cyclic, increasing
3641 [19049] math: [powerpc] erfc incorrect zero sign
3642 [19050] math: [powerpc] log* incorrect zero sign
3643 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3644 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3645 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3646 [19074] network: Data race in _res_hconf_reorder_addrs
3647 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3648 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3649 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3651 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3653 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3654 [19086] manual: posix_fallocate64 documented argument order is wrong.
3655 [19088] math: lround, llround missing exceptions close to overflow
3657 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3658 [19095] math: dbl-64 lrint incorrect for 64-bit long
3659 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3660 [19124] dynamic-link: ld.so failed to build with older assmebler
3661 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3662 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3663 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3664 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3665 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3666 pthread_setaffinity_np
3667 [19156] math: [ldbl-128] j0l spurious underflows
3668 [19164] nptl: tst-getcpu fails with many possible CPUs
3669 [19168] math: math/test-ildoubl and math/test-ldouble failure
3670 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3671 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3673 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3674 (FE_NOMASK_ENV) do not clear SSE exceptions
3675 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3676 _int_new_arena/reused_arena
3677 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3678 [19201] math: dbl-64 remainder incorrect sign of zero result
3679 [19205] math: bits/math-finite.h conditions do not match math.h and
3681 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3682 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3683 for C99-based standards
3684 [19212] libc: features.h not -Wundef clean
3685 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3687 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3688 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3689 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3691 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3692 "inexact" exceptions
3693 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3695 [19242] libc: strtol incorrect in Turkish locales
3696 [19243] malloc: reused_arena can pick an arena on the free list, leading
3697 to an assertion failure and reference count corruption
3698 [19253] time: tzset() ineffective when temporary TZ did not include DST
3700 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3701 [19270] math: [hppa] Shared libm missing __isnanl
3702 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3703 MAP_HUGETLB and MAP_STACK defines
3704 [19313] nptl: Wrong __cpu_mask for x32
3705 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3706 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3707 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3708 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3709 [19363] time: x32: times() return value wrongly truncates/sign extends
3711 [19367] dynamic-link: Improve branch prediction on Silvermont
3712 [19369] network: Default domain name not reset by res_ninit when "search"
3713 / "domain" entry is removed from resolv.conf
3714 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3716 [19385] localedata: bg_BG: time separator should be colon, not comma
3717 [19408] libc: linux personality syscall wrapper may erroneously return an
3718 error on 32-bit architectures
3719 [19415] libc: dladdr returns wrong names on hppa
3720 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3721 IBM905, IBM907, and IBM909
3722 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3723 [19443] build: build failures with -DDEBUG
3724 [19451] build: Make check fails on test-double-vlen2
3725 [19462] libc: Glibc failed to build with -Os
3726 [19465] math: Wrong code with -Os
3727 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3729 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3731 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3732 [19486] math: S390: Math tests fail with "Exception Inexact set".
3733 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3734 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3736 [19590] math: Fail to build shared objects that use libmvec.so functions.
3740 * The following bugs are resolved with this release:
3742 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3743 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3744 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3745 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3746 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3747 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3748 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3749 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3750 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3751 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3752 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3753 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3754 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3755 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3756 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3757 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3758 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3759 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3760 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3761 18657, 18676, 18694, 18696, 18887.
3763 * Cache information can be queried via sysconf() function on s390 e.g. with
3764 _SC_LEVEL1_ICACHE_SIZE as argument.
3766 * A buffer overflow in gethostbyname_r and related functions performing DNS
3767 requests has been fixed. If the NSS functions were called with a
3768 misaligned buffer, the buffer length change due to pointer alignment was
3769 not taken into account. This could result in application crashes or,
3770 potentially arbitrary code execution, using crafted, but syntactically
3771 valid DNS responses. (CVE-2015-1781)
3773 * The time zone file parser has been made more robust against crafted time
3774 zone files, avoiding heap buffer overflows related to the processing of
3775 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3776 large time zone data files. Overly long time zone specifiers in the TZ
3777 variable no longer result in stack overflows and crashes.
3779 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3780 for LD and GD on x86 and x86-64, has been implemented. You will need
3781 binutils-2.24 or later to enable this optimization.
3783 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3784 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3785 Hat). These updates cause user visible changes, such as the fix for bug
3788 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3789 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3790 condition in some applications.
3792 * Added vector math library named libmvec with the following vectorized x86_64
3793 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3795 The library can be disabled with --disable-mathvec. Use of the functions is
3796 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3797 Shared library libmvec.so is linked in as needed when using -lm (no need to
3798 specify -lmvec explicitly for not static builds).
3799 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3801 * A new fmemopen implementation has been added with the goal of POSIX
3802 compliance. The new implementation fixes the following long-standing
3803 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3804 old implementation is still present for use be by existing binaries.
3806 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3807 releases. It has been fixed to match 2.19 and older, but binaries built
3808 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3810 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3811 Contributed by Roland McGrath (Google).
3813 * The header <regexp.h> is deprecated, and will be removed in a future
3814 release. Use of this header will trigger a deprecation warning.
3815 Application developers should update their code to use <regex.h> instead.
3817 This header was formerly part of SUS, but was deprecated in 1994 and
3818 removed from the standard in 2001. Also, the glibc implementation
3819 leaks memory. See BZ#18681 for more details.
3823 * The following bugs are resolved with this release:
3825 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3826 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3827 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3828 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3829 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3830 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3831 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3832 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3833 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3834 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3837 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3838 too little memory for the to-be-scanned arguments and overflow the
3839 allocated buffer. The implementation now correctly computes the required
3840 buffer size when using malloc, and switches to malloc from alloca as
3843 * A new semaphore algorithm has been implemented in generic C code for all
3844 machines. Previous custom assembly implementations of semaphore were
3845 difficult to reason about or ensure that they were safe. The new version
3846 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3847 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3848 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3850 * Port to Altera Nios II has been contributed by Mentor Graphics.
3852 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3853 implementations for powerpc64/powerpc64le.
3854 Implemented by Adhemerval Zanella (IBM).
3856 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3857 and powerpc64le. This may improve lock scaling of existing programs on
3858 HTM capable systems. The lock elision code is only enabled with
3859 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3860 powerpc will issue a transaction abort on every syscall to avoid side
3861 effects being visible outside transactions.
3863 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3864 AArch64. Contributed by ARM Ltd.
3866 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3868 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3869 under certain input conditions resulting in the execution of a shell for
3870 command substitution when the application did not request it. The
3871 implementation now checks WRDE_NOCMD immediately before executing the
3872 shell and returns the error WRDE_CMDSUB as expected.
3874 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3875 processing format strings with a large number of format specifiers.
3877 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3878 infinite loop if the DNS response contained a PTR record of an unexpected
3881 * The minimum GCC version that can be used to build this version of the GNU
3882 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3883 still be used to compile programs using the GNU C Library.
3885 * The GNU C Library is now built with -Werror by default. This can be
3886 disabled by configuring with --disable-werror.
3888 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3890 * The obsolete sigvec function has been removed. This was the original
3891 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3892 programs have been using instead for about 25 years. Of course, ABI
3893 compatibility for old binaries using sigvec remains intact.
3895 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3896 with newer versions of bison.
3898 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3899 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3900 registers overlay two consecutive single-precision registers. MIPS32R2
3901 introduced a new FPU mode (FR=1) where double-precision registers extend the
3902 corresponding single-precision registers which is incompatible with the
3903 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3904 require the use of FR=1 making a transition necessary. New o32 ABI
3905 extensions enable users to migrate over time from the original o32 ABI
3906 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3907 tracks the ABI of any loaded object and verifies that new objects are
3908 compatible. Mode transitions will also be requested as required and
3909 unsupportable objects will be rejected. The ABI checks include both soft and
3910 hard float ABIs for o32, n32 and n64.
3912 GCC 5 with GNU binutils 2.25 onwards:
3913 It is strongly recommended that all o32 system libraries are built using the
3914 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3915 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3916 compiler using --with-fp-32=xx to set this by default.
3920 * The following bugs are resolved with this release:
3922 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3923 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3924 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3925 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3926 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3927 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3928 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3929 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3930 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3931 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3932 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3933 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3934 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3935 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3936 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3938 * Reverted change of ABI data structures for s390 and s390x:
3939 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3940 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3941 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3942 are preserved pointing straight to the same implementation as the old ones.
3943 Given that, new callers will simply provide a too-big buffer to these
3944 functions. Any applications/libraries out there that embed jmp_buf or
3945 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3946 against 2.19 headers will have to rebuilt again. This is necessary in any
3947 case to revert the breakage in their ABI caused by the glibc change.
3949 * Support for file description locks is added to systems running the
3950 Linux kernel. The standard file locking interfaces are extended to
3951 operate on file descriptions, not file descriptors, via the use of
3952 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3953 are associated with an open file instead of a process.
3955 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3957 * The minimum Linux kernel version that this version of the GNU C Library
3958 can be used with is 2.6.32.
3960 * Running the testsuite no longer terminates as soon as a test fails.
3961 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3962 with PASS or FAIL lines for individual tests. A summary of the results is
3963 printed, including a list of failing lists, and "make check" exits with
3964 error status if there were any unexpected failures. "make check
3965 stop-on-test-failure=y" may be used to keep the old behavior.
3967 * The am33 port, which had not worked for several years, has been removed
3970 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3971 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3972 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3973 conflicted with POSIX (support for which was removed in 2.19), the
3974 interfaces those macros enabled remain available when compiling with
3975 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3976 test macros defined.
3978 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3980 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3981 This may improve lock scaling of existing programs on TX capable systems.
3982 The lock elision code is only built with --enable-lock-elision=yes and
3983 then requires a GCC version supporting the TX builtins. With lock elision
3984 default mutexes are elided via __builtin_tbegin, if the cpu supports
3985 transactions. By default lock elision is not enabled and the elision code
3988 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3989 copy the path argument. This allowed programs to cause posix_spawn to
3990 deference a dangling pointer, or use an unexpected pathname argument if
3991 the string was modified after the posix_spawn_file_actions_addopen
3994 * All supported architectures now use the main glibc sysdeps directory
3995 instead of some being in a separate "ports" directory (which was
3996 distributed separately before glibc 2.17).
3998 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3999 On configurations that support it (all Linux configurations), it's now
4000 used regardless of the --enable-add-ons switch to configure. It is no
4001 longer possible to build such configurations without pthreads support.
4003 * Locale names, including those obtained from environment variables (LANG
4004 and the LC_* variables), are more tightly checked for proper syntax.
4005 setlocale will now fail (with EINVAL) for locale names that are overly
4006 long, contain slashes without starting with a slash, or contain ".." path
4007 components. (CVE-2014-0475) Previously, some valid locale names were
4008 silently replaced with the "C" locale when running in AT_SECURE mode
4009 (e.g., in a SUID program). This is no longer necessary because of the
4012 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4013 with application code using Intel MPX instructions. (With all previous
4014 versions, the MPX register state could be clobbered when making calls
4015 into or out of a shared library.) Note that while the new dynamic
4016 linker is compatible with all known x86 hardware whether or not it
4017 supports Intel MPX, some x86 instruction-set emulators might fail to
4018 handle the new instruction encodings. This is known to affect Valgrind
4019 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4020 release), and might affect other tools that do instruction emulation.
4022 * Support for loadable gconv transliteration modules has been removed.
4023 The support for transliteration modules has been non-functional for
4024 over a decade, and the removal is prompted by security defects. The
4025 normal gconv conversion modules are still supported. Transliteration
4026 with //TRANSLIT is still possible, and the //IGNORE specifier
4027 continues to be supported. (CVE-2014-5119)
4029 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4030 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4031 resulting a denial-of-service security vulnerability in applications which
4032 use functions related to iconv. (CVE-2014-6040)
4036 * The following bugs are resolved with this release:
4038 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4039 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4040 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4041 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4042 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4043 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4044 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4045 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4046 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4047 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4048 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4049 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4050 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4051 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4052 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4053 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4054 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4055 16431, 16453, 16474, 16506, 16510, 16529
4057 * Slovenian translations for glibc messages have been contributed by the
4058 Translation Project's Slovenian team of translators.
4060 * The public headers no longer use __unused nor __block. This change is to
4061 support compiling programs that are derived from BSD sources and use
4062 __unused internally, and to support compiling with Clang's -fblock
4063 extension which uses __block.
4065 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4066 large collation sequences to optimize multiple passes. This cache
4067 computation may overflow for large collation sequences and may cause a
4068 stack or buffer overflow. This is now fixed to use a slower algorithm
4069 which does not use a cache if there is an integer overflow.
4071 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4072 rules for large collation sequences to optimize multiple passes and falls
4073 back to alloca if malloc fails, resulting in a possible stack overflow.
4074 The implementation now falls back to an uncached collation sequence lookup
4077 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4078 initialized for static applications resulting in the security feature
4079 being disabled. The pointer guard is now correctly initialized to a
4080 random value for static applications. Existing static applications need
4081 to be recompiled to take advantage of the fix (bug 15754).
4083 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4084 to the d_name member of struct dirent, or omit the terminating NUL
4085 character. (Bugzilla #14699).
4087 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4088 aligned_alloc functions could allocate too few bytes or corrupt the
4089 heap when passed very large allocation size values (Bugzilla #15855,
4092 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4093 for AF_INET6 has been fixed (Bugzilla #16072).
4095 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4096 pap_CW, quz_PE, the_NP.
4098 * Substantially revised locales: gd_GB, ht_HT
4100 * The LC_ADDRESS field was updated to support country_car for almost all
4103 * ISO 1427 definitions were updated.
4105 * ISO 3166 definitions were updated.
4107 * The localedef utility now supports --big-endian and --little-endian
4108 command-line options to generate locales for a different system from that
4109 for which the C library was built.
4111 * Binary locale files now only depend on the endianness of the system for
4112 which they are generated and not on other properties of that system. As a
4113 consequence, binary files generated with new localedef may be incompatible
4114 with old versions of the GNU C Library, and binary files generated with
4115 old localedef may be incompatible with this version of the GNU C Library,
4116 in the following circumstances:
4118 + Locale files may be incompatible on m68k systems.
4120 + Locale archive files (but not separate files for individual locales) may
4121 be incompatible on systems where plain "char" is signed.
4123 * The configure option --disable-versioning has been removed. Builds with
4124 --disable-versioning had not worked for several years.
4126 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4127 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4129 * SystemTap probes for malloc have been introduced.
4131 * SystemTap probes for slow multiple precision fallback paths of
4132 transcendental functions have been introduced.
4134 * Support for powerpc64le has been added.
4136 * The soft-float powerpc port now supports e500 processors.
4138 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4140 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4141 set of header declarations that are enabled by default, even when other
4142 feature test macros or compiler options such as -std=c99 would otherwise
4143 disable some of those declarations.
4145 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4146 conflict with POSIX. The libbsd-compat library (which was a dummy library
4147 that did nothing) has also been removed.
4149 * Preliminary documentation about Multi-Thread, Async-Signal and
4150 Async-Cancel Safety has been added.
4152 * Change of ABI data structures for s390 and s390x:
4153 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4154 allow for future hardware extensions. All library functions that accept or
4155 return these structures were versioned in order to provide backwards
4156 compatibility with existing code. However, not all cases can be handled
4157 with interface versioning. If an application embeds either structure into
4158 another structure and that structure is passed to another compilation unit
4159 which expects the newer larger-sized object then any access to the new
4160 fields will result in undefined behaviour. Similarly any access to fields
4161 that were moved by the enlarging of the structures will cause undefined
4162 behaviour. To fix the undefined behaviour all objects that are part of the
4163 final in-memory image must agree on the size of structures, and this may
4164 require recompilation.
4168 * The following bugs are resolved with this release:
4170 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4171 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4172 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4173 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4174 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4175 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4176 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4177 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4178 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4179 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4180 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4181 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4182 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4185 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4186 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4187 Distributions can re-enable building and using pt_chown via the new configure
4188 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4189 considerable security risks and should only be used if the distribution
4190 understands and accepts the risks.
4192 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4195 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4196 fixed (Bugzilla #15330).
4198 * Add support for calling C++11 thread_local object destructors on thread
4199 and program exit. This needs compiler support for offloading C++11
4200 destructor calls to glibc.
4202 * Improved worst case performance of libm functions with double inputs and
4205 * Support for priority inherited mutexes in pthread condition variables on
4206 non-x86 architectures.
4208 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4210 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4212 * Optimized string functions for ARM. Implemented by Will Newton and
4215 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4217 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4220 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4221 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4223 * Added a benchmark framework to track performance of functions in glibc.
4225 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4226 It is based on draft TS 18661 and currently enabled as a GNU extension.
4228 * On Linux, the clock function now uses the clock_gettime system call
4229 for improved precision, rather than old times system call.
4231 * Added support for version-3 tz format files. This is needed when using
4232 the tz database release 2013e or later, and affects a few unusual cases --
4233 currently only TZ='America/Godthab' for time stamps after 2037.
4235 * Added new API functions pthread_getattr_default_np and
4236 pthread_setattr_default_np to get and set the default pthread
4237 attributes of a process.
4239 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4240 This may improve lock scaling of existing programs on TSX capable systems.
4241 When the --enable-lock-elision=yes parameter is specified at configure
4242 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4245 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4246 availability). Implemented by Ryan S. Arnold.
4248 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4252 * The following bugs are resolved with this release:
4254 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4255 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4256 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4257 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4258 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4259 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4260 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4261 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4262 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4263 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4264 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4265 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4266 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4267 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4268 14879, 14889, 14893, 14898, 14914.
4270 * Optimization of memcpy for MIPS.
4272 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4273 EMFILE has been fixed (Bugzilla #14889).
4275 * The add-on ports collection is now distributed in the "ports" subdirectory
4276 of the main GNU C Library distribution, rather than separately.
4278 * Port to ARM AArch64 contributed by Linaro.
4280 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4281 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4283 Implemented by Andreas Krebbel.
4285 * The new function secure_getenv allows secure access to the environment,
4286 returning NULL if running in a SUID/SGID process. This function replaces
4287 the internal function __secure_getenv.
4289 * SystemTap static probes have been added into the dynamic linker.
4290 Implemented by Gary Benson.
4292 * Optimizations of string functions strstr, strcasestr and memmem.
4293 Implemented by Maxim Kuvyrkov.
4295 * The minimum Linux kernel version that this version of the GNU C Library
4296 can be used with is 2.6.16.
4298 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4299 powerpc POWER7. Implemented by Will Schmidt.
4301 * New configure option --disable-nscd builds the C library such that it
4302 never attempts to contact the Name Service Caching Daemon (nscd).
4303 New configure option --disable-build-nscd avoids building nscd itself;
4304 this is the default if --disable-nscd is used.
4306 * Improved support for cross-compilation, including cross-testing and
4307 bootstrap builds without a previously built glibc.
4309 * Several testsuite tests are now able to test multiple IFUNC variants of an
4310 interface, rather than just testing the one that would be chooen by
4313 * New configure options --with-bugurl and --with-pkgversion, for
4314 distributors to use to embed their bug-reporting and package version
4315 information in --help and --version output.
4317 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4318 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4319 allows creation of chroots without the procfs mounted on /proc.
4321 * The `crypt' function now fails if passed salt bytes that violate the
4322 specification for those values. On Linux, the `crypt' function will
4323 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4324 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4325 when the mode is enabled.
4327 * The `clock_*' suite of functions (declared in <time.h>) is now available
4328 directly in the main C library. Previously it was necessary to link with
4329 -lrt to use these functions. This change has the effect that a
4330 single-threaded program that uses a function such as `clock_gettime' (and
4331 is not linked with -lrt) will no longer implicitly load the pthreads
4332 library at runtime and so will not suffer the overheads associated with
4333 multi-thread support in other code such as the C++ runtime library.
4335 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4340 * The following bugs are resolved with this release:
4342 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4343 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4344 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4345 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4346 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4347 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4348 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4349 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4350 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4351 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4352 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4353 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4354 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4355 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4356 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4357 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4358 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4359 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4360 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4361 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4362 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4363 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4366 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4367 configuring glibc with:
4368 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4369 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4370 Implemented by H.J. Lu.
4374 + define static_assert
4376 + do not declare gets
4378 + declare at_quick_exit and quick_exit also for ISO C11
4380 + aligned_alloc. NB: The code is deliberately allows the size parameter
4381 to not be a multiple of the alignment. This is a moronic requirement
4382 in the standard but it is only a requirement on the caller, not the
4385 + timespec_get added
4387 + uchar.h support added
4389 + CMPLX, CMPLXF, CMPLXL added
4391 Implemented by Ulrich Drepper.
4393 * Support for the IA-64 has been moved to ports.
4395 * Remove support for anything but ELF binary format
4397 * Checking versions of poll, ppoll added.
4398 Implemented by Ulrich Drepper.
4400 * More generic and 64-bit performance optimizations to math functions.
4401 Implemented by Ulrich Drepper.
4403 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4404 headers and functions available at compile time as they were before
4405 version 2.14. This option will be removed at some time in the future
4406 after the TI-RPC library becomes fully sufficient for the needs of
4407 existing applications.
4409 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4410 Note that glibc is not expected to work with any Linux kernel version
4413 * New header <sys/auxv.h> and function getauxval allowing easy access to
4414 the AT_* key-value pairs passed from the Linux kernel. The header also
4415 defines the HWCAP_* bits associated with the AT_HWCAP key.
4417 * New locales: mag_IN
4419 * New configure option --enable-systemtap builds SystemTap static probes
4420 into libc for setjmp and longjmp and into libpthread for various operations.
4421 So far the setjmp/longjmp probes and some of the libpthread probes are
4422 provided only for i*86 and x86_64.
4423 Implemented by Roland McGrath and Rayson Ho.
4425 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4427 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4430 * More optimized functions for SPARC. Implemented by David S. Miller.
4432 * Improved support for cross-compilation, especially bootstrap builds
4433 without a previously built glibc.
4435 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4436 Chris Metcalf from Tilera.
4438 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4439 now supported for ARM processors.
4441 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4442 as the name of the dynamic linker, to distinguish it from the
4443 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4445 * Support for CRIS has been removed from ports.
4447 * A new class of installed header has been documented for low-level
4448 platform-specific functionality. PowerPC added the first instance with a
4449 function to provide time base register access. Contributed by Tulio
4450 Magno Quites Machado Filho.
4452 * ix86 configurations now install header files that are consistent with
4453 what x86-64 configurations install. These same header files can be used
4454 for -m32, -m64, or -mx32 builds.
4455 Contributed by H.J. Lu.
4457 * Math library bug fixes. A thorough audit of all open math library bugs was
4458 conducted by Joseph Myers. Significant progress was made on many math
4459 library bugs resulting in more accurate exceptions and function results.
4460 Many thanks to all those that contributed including Andreas Jaeger for his
4461 patch review and work on the x87 trigonometric instruction issues.
4463 * Timezone data is no longer installed. Timezone-related binaries and scripts
4464 will continue to be installed. Users should obtain their timezone data from
4465 their distribution provider or from the tzdata package at
4466 <ftp://munnari.oz.au/pub/>.
4470 * The following bugs are resolved with this release:
4472 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4473 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4474 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4475 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4476 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4477 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4478 13484, 13506, 13515, 13523, 13524, 13538, 13540
4480 * New program pldd to list loaded object of a process
4481 Implemented by Ulrich Drepper.
4483 * Add nss_db support back to glibc. No more dependency on Berkeley db
4484 and support for initgroups lookups.
4485 Implemented by Ulrich Drepper.
4487 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4488 Contributed by HJ Lu.
4490 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4491 Contributed by HJ Lu.
4493 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4494 on x86-32 and x86-64.
4495 Contributed by Liubov Dmitrieva.
4497 * Optimized strchr and strrchr for SSE on x86-32.
4498 Contributed by Liubov Dmitrieva.
4500 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4501 for x86-64 and x86-32.
4502 Contributed by Liubov Dmitrieva.
4504 * New interfaces: scandirat, scandirat64
4505 Implemented by Ulrich Drepper.
4507 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4508 Implemented by Ulrich Drepper.
4510 * nscd now also caches the netgroup database.
4511 Implemented by Ulrich Drepper.
4513 * Integrate libm with gcc's -ffinite-math-only option.
4514 Implemented by Ulrich Drepper.
4516 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4517 to math functions. Implemented by Ulrich Drepper.
4519 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4520 Implemented by Ulrich Drepper.
4522 * New Linux interfaces: process_vm_readv, process_vm_writev
4524 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4525 Implemented by Ulrich Drepper.
4527 * Optimized nearbyint and strcasecmp for PPC.
4528 Implemented by Adhemerval Zanella.
4530 * New locales: bho_IN, unm_US, es_CU, ta_LK
4534 * The following bugs are resolved with this release:
4536 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4537 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4538 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4539 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4540 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4541 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4542 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4543 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4544 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4545 12795, 12811, 12813, 12814, 12841
4547 * The RPC implementation in libc is obsoleted. Old programs keep working
4548 but new programs cannot be linked with the routines in libc anymore.
4549 Programs in need of RPC functionality must be linked against TI-RPC.
4550 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4552 Visible changes of this change include (obviously) the inability to link
4553 programs using RPC functions without referencing the TI-RPC library and the
4554 removal of the RPC headers from the glibc headers.
4555 Implemented by Ulrich Drepper.
4557 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4558 syncfs, setns, sendmmsg
4560 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4561 yue_HK, lij_IT, mhr_RU
4563 * New encodings: CP770, CP771, CP772, CP773, CP774
4565 * New program sotruss to trace calls through PLTs
4566 Implemented by Ulrich Drepper.
4568 * The malloc hook implementation is marked deprecated and will be removed
4569 from the default implementation in the next version. The design never
4570 worked ever since the introduction of threads. Even programs which do
4571 not create threads themselves can use multiple threads created internally.
4575 * The following bugs are resolved with this release:
4577 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4578 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4579 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4580 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4583 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4585 * POWER7 optimizations: memset, memcmp, strncmp
4587 * New optimized string functions for x86-64: strnlen (SSE2),
4588 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4589 Implemented by Ulrich Drepper.
4593 * The following bugs are resolved with this release:
4595 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4596 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4597 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4598 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4599 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4600 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4601 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4602 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4604 * New interfaces: pthread_getname_np, pthread_setname_np
4606 * New Linux interface: recvmmsg
4608 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4610 * The dynamic linker now recognizes supported ABI versions from the
4611 EI_ABIVERSION field in the ELF header.
4612 Implemented by Ulrich Drepper.
4614 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4615 will not be used to fill in password fields in the passwd.byname replies.
4616 Instead it is used to synthesize the shadow.byname table, should it be
4617 missing. This is a useful mode in some installations involving Solaris.
4618 Implemented by Ulrich Drepper.
4620 * New locales: kok_IN, sq_MK, cv_RU
4624 * The following bugs are resolved with this release:
4626 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4627 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4628 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4629 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4630 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4631 10789, 10817, 10823, 10840, 10847
4633 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4635 Implemented by Ulrich Drepper.
4637 * Checking version of longjmp added that fails if an uninitialized stack
4638 frame would be created. Implemented by Ulrich Drepper.
4640 * STT_GNU_IFUNC is now supported in static executables.
4641 Implemented by H.J. Lu.
4643 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4645 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4646 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4647 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4648 Contributed by H.J. Lu.
4650 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4651 Implemented by Ulrich Drepper.
4653 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4655 Contributed by H.J. Lu.
4657 * Support for fma instruction in AVX on x86-64.
4658 Implemented by H.J. Lu and Ulrich Drepper.
4660 * AVX support in x86-64 auditing support in ld.so.
4661 Implemented by H.J. Lu.
4663 * STB_GNU_UNIQUE support added.
4664 Implemented by Ulrich Drepper.
4666 * Implement second fallback mode for optimized DNS lookup for even more
4667 broken environments. If two requests from the same port are not
4668 handled correctly close the socket and open a new one before sending
4669 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4670 can be used to select this mode right away, instead of rediscovering the
4671 necessity is every process again.
4672 Implemented by Ulrich Drepper.
4674 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4675 Implemented by Adam Tkac.
4677 * Optimized iconv conversions for S390x.
4678 Implemented by Andreas Krebbel.
4680 * Using condvars with PI mutexes is now more efficient due to kernel
4681 support for requeueing to PI futexes. NPTL support added for x86-64.
4682 Implemented by Ulrich Drepper.
4684 * New locales: ps_AF, my_MM
4688 * The following bugs are resolved with this release:
4690 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4691 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4692 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4693 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4694 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4696 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4697 Implemented by Ulrich Drepper.
4699 * New Linux interfaces: accept4, fallocate, fallocate64.
4700 Implemented by Ulrich Drepper.
4702 * Correct declarations of string function when used in C++ code. This
4703 could lead to compile errors for invalid C++ code.
4705 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4708 * New POSIX 2008 interface: psiginfo
4709 Implemented by Ulrich Drepper.
4711 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4712 Implemented by Ulrich Drepper.
4714 * Support for selecting between multiple function definitions at runtime
4715 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4717 * The libcrypt library can now use the hash function implementations in
4718 NSS. Implemented by Ulrich Drepper.
4720 * The malloc implementation can be compiled to be less memory efficient
4721 but higher performing in multi-threaded programs.
4722 Implemented by Ulrich Drepper.
4724 * New locales: nan_TW@latin, ks_IN
4726 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4727 Implemented by Ulrich Drepper.
4729 * Extended printf hook support. It is possible to use user-defined types
4730 and extend existing format specifiers.
4731 Implemented by Ulrich Drepper.
4733 * Handling for group shadow files has been added.
4734 Implemented by Ulrich Drepper.
4736 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4737 servers (the case, e.g., for some people using the built-in DNS
4738 server in ADSL modems/routers). There is a once-per-process timeout
4739 in case of a broken server. To avoid it, users can run nscd or put
4740 'options single-request' in /etc/resolv.conf.
4741 Implemented by Ulrich Drepper.
4745 * The following bugs are resolved with this release:
4747 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
4748 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
4749 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
4750 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
4751 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
4753 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4754 up at the same time. Implemented by Ulrich Drepper.
4756 * TLS descriptors for LD and GD on x86 and x86-64.
4757 Implemented by Alexandre Oliva.
4759 * getaddrinfo now handles DCCP and UDPlite.
4760 Implemented by Ulrich Drepper.
4762 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4763 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4764 Implemented by Ulrich Drepper.
4766 * New implementation of memmem, strstr, and strcasestr which is O(n).
4767 Implemented by Eric Blake.
4769 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4771 * Implement "e" option for popen to open file descriptor with the
4772 close-on-exec flag set. Implemented by Ulrich Drepper.
4774 * Implement "b" mode for fmemopen. In this mode writes writes don't
4775 implicitly add a NUL byte and seeks from the end of the buffer really
4776 use the buffer end, not the string length as the basis.
4777 Implemented by Ulrich Drepper.
4779 * Many functions, exported and internal, now atomically set the close-on-exec
4780 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4782 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4784 Implemented by Pravin Satpute.
4786 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4790 * The following bugs are resolved with this release:
4792 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4793 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4794 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4795 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4796 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4797 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4798 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4800 * New locales: bo_CN, bo_IN, shs_CA.
4802 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4804 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4805 Implemented by Pravin Satpute.
4807 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4809 * nscd caches now all timeouts for DNS entries
4810 Implemented by Ulrich Drepper.
4812 * nscd is more efficient and wakes up less often.
4813 Implemented by Ulrich Drepper.
4815 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4816 vdprintf, and obstack_vprintf.
4817 Implemented by Jakub Jelinek.
4819 * Faster memset for x86-64.
4820 Implemented by Harsha Jagasia and H.J. Lu.
4822 * Faster memcpy on x86.
4823 Implemented by Ulrich Drepper.
4825 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4826 Implemented by Ulrich Drepper.
4828 * Faster sqrt and sqrtf implemention for some PPC variants.
4829 Implemented by Steven Munroe.
4833 * The following bugs are resolved with this release:
4835 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4836 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4837 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4838 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4839 5071, 5103, 5104, 5112, 5113, 5184, 5186
4841 * More checking functions: fread, fread_unlocked, open*, mq_open.
4842 Implemented by Jakub Jelinek and Ulrich Drepper.
4844 * Extend fortification to C++. Implemented by Jakub Jelinek.
4846 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4847 by not recognizing 'a' as a modifier when those specs are requested.
4848 Implemented by Jakub Jelinek.
4850 * PPC optimizations to math and string functions.
4851 Implemented by Steven Munroe.
4853 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4854 options to be passed. Implemented by Ulrich Drepper.
4856 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4858 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4859 Implemented by Ulrich Drepper.
4861 * Handle private futexes in the NPTL implementation.
4862 Implemented by Jakub Jelinek and Ulrich Drepper.
4864 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4865 Implemented by Roland McGrath and Ulrich Drepper.
4867 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4869 * SHA-256 and SHA-512 based password encryption.
4870 Implemented by Ulrich Drepper.
4872 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4873 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4876 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4877 Implemented by Ulrich Drepper.
4881 * The following bugs are resolved with this release:
4883 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4884 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4885 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4886 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4887 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4888 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4889 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4892 * New Linux interfaces: epoll_pwait, sched_getcpu.
4894 * New generic interfaces: strerror_l.
4896 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4900 * The following bugs are resolved with this release:
4902 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4903 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4904 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4905 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4906 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4907 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4908 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4909 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4910 3225, 3251, 3252, 3253, 3273
4912 * For Linux, the sorting of addresses returned by getaddrinfo now also
4913 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4914 Implemented by Ulrich Drepper.
4916 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4917 Implemented by Ulrich Drepper.
4919 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4921 * New iconv module for MIK. Contributed by Alexander Shopov.
4923 * For sites with broken group and/or passwd database, the auto-propagate
4924 option of nscd can prevent creating ID lookup entries from the results
4925 of a name lookup and vice versa. This usually is no problem but some
4926 site might have problems with the default behavior.
4927 Implemented by Ulrich Drepper.
4929 * Iterating over entire database in NIS can be slow. With the
4930 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4931 to trade time for memory. The entire database will be read at once.
4932 Implemented by Ulrich Drepper.
4934 * The interfaces introduced in RFC 3542 have been implemented by
4937 * Support for the new ELF hash table format was added by Ulrich Drepper.
4939 * Support for priority inheritance mutexes added by Jakub Jelinek and
4942 * Support for priority protected mutexes added by Jakub Jelinek.
4944 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4945 or_IN, csb_PL, fy_NL, sr_ME.
4949 * More overflow detection functions.
4951 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4952 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4954 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4955 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4956 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4957 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4958 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4959 by Masahide Washizawa.
4961 * It is now possible to install audit libraries for the dynamic linker using
4962 LD_AUDIT. Implemented by Ulrich Drepper.
4964 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4965 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4966 For a libc and libpthread that works well on Linux 2.4 kernels, we
4967 recommend using the stable 2.3 branch.
4969 * The new function open_wmemstream acts like open_memstream,
4970 but uses a wchar_t wide character buffer.
4972 * The new function ppoll is an improved version of poll, similar to pselect.
4974 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4975 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4976 renameat, unlinkat, linkat, symlinkat, readlinkat.
4978 * New Linux kernel system calls: unshare,
4979 inotify_init, inotify_add_watch, inotify_rm_watch.
4981 * The euidaccess function is now also known by the alias eaccess,
4982 for compatibility with some other systems.
4984 * Timezone data updated to 2006b version.
4988 * The following bugs are resolved with this release:
4990 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4991 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4992 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4993 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4994 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4995 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4997 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4999 * As of this release, GCC 4 can be used to compile the C Library.
5001 * Timezone data updated to 2005m version.
5005 * The following bugs are resolved with this release:
5007 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5008 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5009 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5010 777, 787, 821, 822, 823, 825
5012 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5016 * Support for RFC 3678. Real implementations exist only for Linux so far.
5017 Implemented by Ulrich Drepper.
5019 * nscd can now cache entries persistently. Expiring entries are reloaded.
5020 For speedups the cache can be shared in memory with client processes.
5021 Implemented by Ulrich Drepper.
5023 * nscd can now perform SELinux checks.
5024 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5026 * getaddrinfo queries are now cached. Canonical name lookup is performed
5028 Implemented by Ulrich Drepper.
5030 * The nothrow function attribute is used when headers are used by gcc when
5031 compiling C code. This can avoid significant amounts of exception
5034 * The malloc functions perform more error checking and are stricter when
5035 it comes to reacting on errors. The default action is to terminate
5036 the process after showing an error message. Implemented by Ulrich Drepper.
5038 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5039 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5041 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5042 namespaces using the new function dlmopen(). This feature is of course,
5043 like most other dynamic loading functionality, not available in statically
5044 linked applications. Implemented by Ulrich Drepper.
5046 * Low-overhead boundary checking variants of string and some stdio functions
5047 were added. These are to be used in conjunction with a gcc patch by
5048 Jakub Jelinek which adds calls to these functions if possible.
5049 Implemented by Jakub Jelinek and Ulrich Drepper.
5051 * Old code for several operating systems and machine architectures that
5052 have not been in working condition in a long time have been removed from
5053 the main source tree maintained by the GNU C Library's maintainers.
5054 These files are now reside in the separate `ports' source module
5055 that is usable as an add-on when building the library.
5059 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5060 interrogate the dynamic linker, compatible with the Solaris interface.
5062 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5063 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5065 * getifaddrs now uses the netlink interface on Linux to get its information.
5066 Implemented by Thorsten Kukuk.
5068 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5069 Implemented by Ulrich Drepper.
5071 * support for non-executable stacks on x86 has been added. Changes mostly
5074 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5077 * getaddrinfo now performs destination address selection according to
5082 * Thread-safe interfaces for many functions that access locale data
5083 were added in version 2.3, but these features were omitted from NEWS.
5084 Many functions have variants with an `_l' suffix that take a `locale_t'
5085 object as a parameter rather than consulting the current locale.
5086 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5087 create and maintain `locale_t' objects. Additionally, the new function
5088 `uselocale' sets "the current locale" (as used by functions not so
5089 parameterized) set for an individual thread. These features were added
5090 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5092 * The functions getresuid, getresgid, setresuid, and setresgid, which
5093 have long been available on Linux, are now declared in <unistd.h>
5094 and are now also available on the Hurd.
5096 * ELF thread-local storage support (TLS) now works on x86-64.
5098 * The new dynamic string token $LIB is expanded in shared library names.
5099 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5101 * Aldy Hernandez contributed complete software floating point support for
5102 PowerPC machines with no FPU.
5104 * fexecve is implemented on Linux.
5106 * The `btowc' function should work at least twice as fast due to
5107 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5109 * With approriate thread add-ons cancelable functions are now implemented
5110 in libc.so as well. No need to call the function in libpthread. This
5111 change allowed to finally disable the incorrect and expensive handling
5112 of weak definition in ld.so.
5114 * Yet more PLT entries in libc.so have been removed. We finally arrived
5115 at the bare minimum. Startup times improved appropriately.
5117 * Support for the new Linux/x86 system call interface was added. The
5118 AT_SYSINFO auxiliary vector entry is recognized and handled.
5122 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5125 * iconv (the program and the interface) now accepts empty names (excluding
5126 options like //TRANSLIT) to mean "use charset of current locale".
5128 * localedef can now transliterate characters in strings which are not in
5129 the provided charmap. The information from the input locale is used.
5131 * Prelinking support was added for ELF targets. This requires additional
5132 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5134 * Read-only stdio streams now use mmap to speed up operation by eliminating
5135 copying and buffer underflows. To use add 'm' to the mode string of
5136 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5138 * The malloc functions were completely rewritten by Wolfram Gloger based
5139 on Doug Lea's malloc-2.7.0.c.
5141 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5142 implementation of regex.
5144 * Bruno Haible upgraded the iconv and locale implementation to support
5147 * Contents of the LC_* and LANG environment variables in the CEN style are
5148 not recognized anymore. It never was used. Change by Ulrich Drepper.
5150 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5151 thread-local storage (TLS) ABI on some platforms.
5152 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5154 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5155 EUC-JISX0213, and TSCII.
5157 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5158 BSD-compatible interface for getting all network interface addresses.
5159 Implementation for IPv4 by Roland McGrath.
5161 * Loading of locale data is faster due to the introduction of a locale
5162 archive. Implemented by Roland McGrath and Ulrich Drepper.
5164 * Startup times are significantly reduced by not using exported functions
5165 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5168 * Steven Munroe contributed a port to PowerPC64/Linux.
5172 * The Hurd now uses the GNU libio implementation of stdio rather than the
5173 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5175 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5176 with the same behavior as the Linux system call of the same name.
5180 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5181 128-bit long double format.
5183 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5184 IBM1161, and IBM1162 charsets.
5186 * Andreas Jaeger contributed a port to x86-64/Linux.
5188 * Peter Bruin contributed a port to PowerPC/Hurd.
5190 * libc functions using I/O streams now can handle wide-oriented streams
5193 * optimizations in the dynamic linker. Binaries created by recent binutils
5194 versions start up quicker due to reduced time spent on relocations.
5196 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5200 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5201 asinh, atanh, j0 for the 128-bit long double format.
5203 * Bruno Haible updated all the code handling Unicode in some form to
5204 support Unicode 3.1.
5206 * Speed of regex for single-byte locales is back to previous levels.
5207 Patch by Isamu Hasegawa.
5209 * Alpha, SPARC, and IA-64 now also using floating stacks.
5211 * Startup time of internationalized applications greatly improved through
5212 iconv cache. Use iconvconfig to generate the cache file.
5213 Contributed by Ulrich Drepper.
5215 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5216 severe performance problems. Patch by David Mosberger.
5218 * The Hurd port got a lot more functionality like AIO, various stdio
5219 extensions, etc. Mainly done by Roland McGrath.
5221 * mtrace can now lookup symbols in shared libraries.
5225 * Intel's IA-64 math library is largely integrated. It provides fast and
5226 accurate implementatations for most basic and standard math functions
5227 in float, double, and long double format.
5229 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5230 and asin for the 96-bit long double format and asin, log, tan for the
5231 128-bit long double format.
5233 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5234 The basic double functions exist today. Contributed by Abraham Ziv
5235 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5236 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5238 * An asynchronous name lookup library was added. The interface is designed
5239 after POSIX AIO. The proposal was circulated beforehand to get comments.
5240 No negative ones came in. Implemented by Ulrich Drepper.
5242 * Port to S390/64bit contributed by Martin Schwidefsky
5243 <schwidefsky@de.ibm.com>.
5245 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5246 of functions for Linux/IA-64.
5248 * The RPC code is now thread safe. Threads can now use the same service
5249 of different services at the same time. Patch by Eric Norum
5250 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5252 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5253 family of functions for Linux/S390.
5255 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5256 of functions for Linux/x86.
5258 * Port to Linux/CRIS contributed by Axis Communications.
5262 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5263 we can now check for namespace violations and missing declarations. The
5264 result is that almost all headers are now Unix-compliant (as defined in
5265 the upcoming XPG6). The negative side is that some programs might need
5266 corrections, too, if they depend on the incorrect form of the headers in
5267 previous versions which defined too many symbols and included too many
5270 * regex now handles multibyte character sets correctly.
5271 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5273 * iconv (the program) does now conform to the upcoming XPG6 and handles
5274 charmaps. Instead of the charset names the path of charmaps can be
5275 provided and the conversion happens based on this data.
5276 Contributed by Ulrich Drepper.
5278 * The locale program now provides detailed information about the installed
5283 only lists the names of the supported locales
5287 provides details such as country, language, and codeset name.
5288 Contributed by Ulrich Drepper.
5292 * The gencat program now parses the input file according to the charset
5293 selected by the LC_CTYPE category. This is important for stateful
5294 character sets. To make generating catalogs easier there is a way
5295 to overwrite the charset selected by the locale: before the first
5296 message or $ quote line the catalog can contain a line like
5298 $ codeset=ISO-8859-2
5300 to select the charset (ISO-8859-2 in this case).
5302 Implemented by Shinya Hanataka and Ulrich Drepper.
5304 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5305 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5306 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5308 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5309 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5311 * The LANGUAGE environment variable is now ignored unless the locale is
5312 changed from the default "C" locale.
5314 * The usual bug fixes.
5318 * Greg McGary added runtime support for bounds checking using gcc's
5319 new -fbounded-pointers option. ix86 target is complete. PowerPC
5322 * Thorsten Kukuk added secure mode support to nscd.
5324 * The Berkeley db libraries have been removed.
5326 Related, the nss_db module is now in a separate package since it
5327 obviously requires a database library being available.
5329 * Wide character I/O streams implemented by Ulrich Drepper.
5331 * Functions from the extended socket API added by Ulrich Drepper.
5333 * Functions feenableexcept and fedisableexcept to control the
5334 behaviour of individual exceptions have been added by Andreas Jaeger.
5336 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5338 * The resolver code has been updated from bind 8.2.3-T5B which supports
5339 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5342 This change could in some situations effect backward compatibility. Since
5343 now `_res' is a thread-local instead of a global variable, modifying it
5344 in one thread does not have any effect in other threads.
5346 The resolver library was also extended to allow IPv6 as the transport
5347 protocol for the requests. This work was done by Stig Venaas.
5349 * Compatibility code for K&R C compilers has been removed from the
5350 header files. A ISO C compiler is needed to use the library
5351 (conforming to either C89 or C99 standard).
5353 * Complete rewrite of the localedef program to support multibyte character
5354 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5355 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5356 Implemented by Ulrich Drepper.
5358 Bruno Haible significantly improved the generation and use of the data
5359 structures for the wide character tables.
5361 * Plural handling in gettext implemented by Ulrich Drepper.
5363 * The utmp daemon has been removed.
5365 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5367 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5370 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5372 * POSIX barriers implemented by Kaz Kylheku.
5374 * POSIX spawn function family implemented by Ulrich Drepper.
5376 * POSIX spinlocks are now available.
5378 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5380 * the configure option --enable-kernel=X.Y.Z allows to strip out
5381 compatibility for kernel versions before X.Y.Z. This is currently only
5382 implemented for Linux.
5384 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5385 field sin6_scope_id. This means that all programs using IPv6 should be
5386 recompiled. Don't expect binary compatibility with previous glibc
5389 * various conversion modules for IBM character sets contributed by
5392 * IA-64 port by Jes Sorensen and HJ Lu.
5406 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5408 * New xdr functions are added; some rpc functions are now 64bit clean.
5410 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5412 * Fixed known incompatibilities with glibc 2.0.
5414 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5416 * Optimized a number of functions (especially the ELF dynamic loader).
5418 * Update timezone data files.
5420 * lots of charmaps corrections
5422 * some new locale definitions and charmaps
5427 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5428 conform to POSIX member type requirements. Symbol versions have been
5429 adjusted as needed within the library, and for direct use by applications,
5430 but there is potential for problems if third-party libraries use
5431 struct timeval as part of their interface. This does not present
5432 a problem for X and other "essential" system libraries.
5434 * An additional locale model to support C++ Standard Library locale
5435 model and probably more was implemented by Ulrich Drepper.
5437 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5440 * Miles Bader provided the `argp' function family to support hierachical
5441 command line argument parsing, layered on top of getopt.
5443 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5445 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5448 * scanf recognizes the %a and %A format for scanning floating point numbers.
5450 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5451 information and interfaces for the available integer types.
5453 * about 130 new math functions were added to implement the ISO C9x math
5456 * the new header <complex.h> contains definitions of the complex math
5457 functions from ISO C 9X.
5459 * the new header <tgmath.h> defines generic macros to use complex or
5460 real valued functions.
5462 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5464 * Andreas Jaeger provided a test suite for the math library.
5466 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5468 * Ulrich Drepper added character set conversion functions (iconv).
5470 * Optimized string functions have been added.
5472 * The localedata addon is now part of glibc.
5474 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5476 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5477 daemon for NSS (nscd).
5479 Missing a better place here are some numbers on improvements. Under
5480 Linux 2.1.125 un-tar-ing the kernel sources takes
5484 using local files 12.19s 6.88s 22.91s
5486 using NIS 13.92s 8.91s 26.34s
5488 using NIS & nscd 10.37s 7.34s 25.30s
5490 using NIS+ 27.57s 30.37s 640.46s
5492 using NIS+ & nscd 10.25s 7.83s 26.51s
5494 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5496 Keep in mind that non-namelookup related operations dominate above times.
5497 It was just a common complain that using NIS+ unpacking the kernel is
5500 [1] The old nscd implementation is not available anymore since it was
5501 distributed with glibc up to version 2.0.98 and thus is now replaced.
5503 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5505 * Mark Kettenis provided a Hesiod NSS module.
5507 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5508 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5510 * rcmd can now handle netgroups (Dick Streefland).
5512 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5515 * Support for the IPv6 protocol has been added to the socket API, as per the
5516 latest draft standards.
5518 * Support for Linux 2.2 has been added.
5520 * Interface changes relative to the latest 2.0.x release:
5521 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5522 addseverity NEW: Unix98
5523 alphasort64 NEW: LFS
5524 argp_err_exit_status NEW: argp, GNU ext
5525 argp_error NEW: argp, GNU ext
5526 argp_failure NEW: argp, GNU ext
5527 argp_help NEW: argp, GNU ext
5528 argp_parse NEW: argp, GNU ext
5529 argp_program_bug_address NEW: argp, GNU ext
5530 argp_program_version NEW: argp, GNU ext
5531 argp_program_version_hook NEW: argp, GNU ext
5532 argp_state_help NEW: argp, GNU ext
5533 argp_usage NEW: argp, GNU ext
5534 authdes_create NEW: Secure RPC
5535 authdes_getucred NEW: Secure RPC
5536 authdes_pk_create NEW: Secure RPC
5537 backtrace NEW: GNU ext.
5538 backtrace_symbols NEW: GNU ext.
5539 backtrace_symbols_fd NEW: GNU ext.
5541 cacosf NEW: ISO C 9x
5542 cacosh NEW: ISO C 9x
5543 cacoshf NEW: ISO C 9x
5544 cacoshl NEW: ISO C 9x
5545 cacosl NEW: ISO C 9x
5552 casinf NEW: ISO C 9x
5553 casinh NEW: ISO C 9x
5554 casinhf NEW: ISO C 9x
5555 casinhl NEW: ISO C 9x
5556 casinl NEW: ISO C 9x
5558 catanf NEW: ISO C 9x
5559 catanh NEW: ISO C 9x
5560 catanhf NEW: ISO C 9x
5561 catanhl NEW: ISO C 9x
5562 catanl NEW: ISO C 9x
5563 cbc_crypt NEW: Secure RPC
5567 ccoshf NEW: ISO C 9x
5568 ccoshl NEW: ISO C 9x
5574 cimagf NEW: ISO C 9x
5575 cimagl NEW: ISO C 9x
5576 clearerr_locked REMOVED
5577 clntunix_create NEW: sunrpc ext
5579 clog10 NEW: ISO C 9x
5580 clog10f NEW: ISO C 9x
5581 clog10l NEW: ISO C 9x
5591 cprojf NEW: ISO C 9x
5592 cprojl NEW: ISO C 9x
5594 crealf NEW: ISO C 9x
5595 creall NEW: ISO C 9x
5600 csinhf NEW: ISO C 9x
5601 csinhl NEW: ISO C 9x
5604 csqrtf NEW: ISO C 9x
5605 csqrtl NEW: ISO C 9x
5609 ctanhf NEW: ISO C 9x
5610 ctanhl NEW: ISO C 9x
5612 des_setparity NEW: Secure RPC
5613 ecb_crypt NEW: Secure RPC
5614 endutxent NEW: Unix98
5616 exp10f NEW: ISO C 9x
5617 exp10l NEW: ISO C 9x
5621 fattach NEW: STREAMS
5622 fdetach NEW: STREAMS
5626 feclearexcept NEW: ISO C 9x
5627 fegetenv NEW: ISO C 9x
5628 fegetexceptflag NEW: ISO C 9x
5629 fegetround NEW: ISO C 9x
5630 feholdexcept NEW: ISO C 9x
5632 feraiseexcept NEW: ISO C 9x
5633 ferror_locked REMOVED
5634 fesetenv NEW: ISO C 9x
5635 fesetexceptflag NEW: ISO C 9x
5636 fesetround NEW: ISO C 9x
5637 fetestexcept NEW: ISO C 9x
5638 feupdateenv NEW: ISO C 9x
5639 fflush_locked REMOVED
5643 fgets_unlocked NEW: GNU ext.
5644 fileno_locked REMOVED
5656 fputc_locked REMOVED
5657 fputs_unlocked NEW: GNU ext.
5658 fread_unlocked NEW: GNU ext.
5663 fstatvfs NEW: Unix98
5667 ftruncate64 NEW: LFS
5669 fwrite_unlocked NEW: GNU ext.
5670 gai_strerror NEW: IPv6
5674 getchar_locked REMOVED
5676 getdate_err NEW: Unix98
5677 getdate_r NEW: GNU ext.
5679 getnameinfo NEW: IPv6
5680 getnetname NEW: Secure RPC
5681 getpmsg NEW: STREAMS
5682 getpt NEW: Unix98 PTY
5683 getrlimit64 NEW: LFS
5684 getutxent NEW: Unix98
5685 getutxid NEW: Unix98
5686 getutxline NEW: Unix98
5687 glob64 NEW: GNU ext.
5688 globfree64 NEW: GNU ext.
5689 gnu_get_libc_release NEW: GNU ext.
5690 gnu_get_libc_version NEW: GNU ext.
5691 grantpt NEW: Unix98 PTY
5692 host2netname NEW: Secure RPC
5694 iconv_close NEW: iconv
5695 iconv_open NEW: iconv
5696 if_freenameindex NEW: IPv6
5697 if_indextoname NEW: IPv6
5698 if_nameindex NEW: IPv6
5699 if_nametoindex NEW: IPv6
5700 in6addr_any NEW: IPv6
5701 in6addr_loopback NEW: IPv6
5702 inet6_isipv4mapped NEW: IPv6
5703 isastream NEW: STREAMS
5704 iswblank NEW: GNU ext.
5705 key_decryptsession NEW: Secure RPC
5706 key_decryptsession_pk NEW: Secure RPC
5707 key_encryptsession NEW: Secure RPC
5708 key_encryptsession_pk NEW: Secure RPC
5709 key_gendes NEW: Secure RPC
5710 key_get_conv NEW: Secure RPC
5711 key_secretkey_is_set NEW: Secure RPC
5712 key_setnet NEW: Secure RPC
5713 key_setsecret NEW: Secure RPC
5714 llrint NEW: ISO C 9x
5715 llrintf NEW: ISO C 9x
5716 llrintl NEW: ISO C 9x
5717 llround NEW: ISO C 9x
5718 llroundf NEW: ISO C 9x
5719 llroundl NEW: ISO C 9x
5724 lrintf NEW: ISO C 9x
5725 lrintl NEW: ISO C 9x
5726 lround NEW: ISO C 9x
5727 lroundf NEW: ISO C 9x
5728 lroundl NEW: ISO C 9x
5730 makecontext NEW: Unix98
5731 mempcpy NEW: GNU ext.
5734 modify_ldt NEW: kernel
5738 nearbyint NEW: ISO C 9x
5739 nearbyintf NEW: ISO C 9x
5740 nearbyintl NEW: ISO C 9x
5741 netname2host NEW: Secure RPC
5742 netname2user NEW: Secure RPC
5743 nexttoward NEW: ISO C 9x
5744 nexttowardf NEW: ISO C 9x
5745 nexttowardl NEW: ISO C 9x
5749 passwd2des NEW: Secure RPC
5751 pow10f NEW: GNU ext.
5752 pow10l NEW: GNU ext.
5755 printf_size NEW: GNU ext.
5756 printf_size_info NEW: GNU ext.
5757 profil_counter REMOVED
5758 pthread_mutexattr_getkind_np REPLACED
5759 pthread_mutexattr_setkind_np REPLACED
5760 ptsname NEW: Unix98 PTY
5761 ptsname_r NEW: Unix98 PTY
5763 putchar_locked REMOVED
5764 putgrent NEW: GNU ext.
5766 putpmsg NEW: STREAMS
5767 pututxline NEW: Unix98
5771 readdir64_r NEW: LFS
5772 remquo NEW: ISO C 9x
5773 remquof NEW: ISO C 9x
5774 remquol NEW: ISO C 9x
5776 roundf NEW: ISO C 9x
5777 roundl NEW: ISO C 9x
5779 scalbln NEW: ISO C 9x
5780 scalblnf NEW: ISO C 9x
5781 scalblnl NEW: ISO C 9x
5783 sendfile NEW: kernel
5784 setcontext NEW: Unix98
5785 setrlimit64 NEW: LFS
5786 setutxent NEW: Unix98
5788 sigignore NEW: Unix98
5789 sigqueue NEW: POSIX.1b
5790 sigrelse NEW: Unix98
5791 sigset NEW: POSIX.1b
5792 sigtimedwait NEW: POSIX.1b
5793 sigwaitinfo NEW: POSIX.1b
5794 sincos NEW: GNU ext.
5795 sincosf NEW: GNU ext.
5796 sincosl NEW: GNU ext.
5800 strcasestr NEW: GNU ext.
5801 strtoimax NEW: ISO C 9x
5802 strtoumax NEW: ISO C 9x
5803 strverscmp NEW: GNU ext.
5804 svcauthdes_stats NEW: Secure RPC
5805 svcunix_create NEW: sunrpc etx
5806 svcunixfd_create NEW: sunrpc ext
5807 swapcontext NEW: Unix98
5808 tcgetsid NEW: Unix98 PTY
5809 tdestroy NEW: GNU ext.
5810 tgamma NEW: ISO C 9x
5811 tgammaf NEW: ISO C 9x
5812 tgammal NEW: ISO C 9x
5816 truncf NEW: ISO C 9x
5817 truncl NEW: ISO C 9x
5819 unlockpt NEW: Unix98 PTY
5820 updwtmpx NEW: Unix98
5821 user2netname NEW: Secure RPC
5822 utmpxname NEW: Unix98
5823 versionsort NEW: GNU ext.
5824 versionsort64 NEW: GNU ext.
5826 wcscasecmp NEW: GNU ext.
5827 wcsncasecmp NEW: GNU ext.
5828 wcsnlen NEW: GNU ext.
5829 wcstoimax NEW: ISO C 9x
5830 wcstoll NEW: ISO C 9x
5831 wcstoull NEW: ISO C 9x
5832 wcstoumax NEW: ISO C 9x
5834 wordexp NEW: POSIX.2
5835 wordfree NEW: POSIX.2
5836 write_profiling REMOVED
5837 xdecrypt NEW: Secure RPC
5838 xdr_authdes_cred NEW: Secure RPC
5839 xdr_authdes_verf NEW: Secure RPC
5840 xdr_cryptkeyarg NEW: Secure RPC
5841 xdr_cryptkeyarg2 NEW: Secure RPC
5842 xdr_cryptkeyres NEW: Secure RPC
5843 xdr_getcredres NEW: Secure RPC
5844 xdr_key_netstarg NEW: Secure RPC
5845 xdr_key_netstres NEW: Secure RPC
5846 xdr_keybuf NEW: Secure RPC
5847 xdr_keystatus NEW: Secure RPC
5848 xdr_netnamestr NEW: Secure RPC
5849 xdr_sizeof NEW: Secure RPC
5850 xdr_unixcred NEW: sunrpc ext
5851 xencrypt NEW: Secure RPC
5852 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5863 * inet_ntoa is thread-safe
5865 * updwtmp is moved from libutil to libc
5867 * rewrite of cbrt function
5869 * update of timezone data
5883 * add atoll function
5885 * fix complex problems in Berkeley DB code
5887 * fix math functions
5891 * fixed lots of header problems (especially Linux/GNU specific)
5893 * dynamic loader preserves all registers
5895 * Roland McGrath provided support for handling of auxiliary objects in
5896 the ELF dynamic loader.
5898 * support for parallel builds is improved
5902 * GNU extensions are no longer declared by default. To enable them you
5903 must define the macro `_GNU_SOURCE' in your program or compile with
5906 * The library has changed from using GNU ld symbol aliases to using weak
5907 symbols where available. The ELF object file format supports weak
5908 symbols; GNU ld also supports weak symbols in the a.out format. (There
5909 is also now support for other GNU ld extensions in ELF. Use the
5910 `--with-elf' option to configure to indicate you have ELF, and
5911 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5912 of many files which contained only symbol aliases, reducing the size of
5913 the source and the compiled library; many other files were renamed to
5914 less cryptic names previously occupied by the symbol alias files.
5915 There is a new header file <elf.h> for programs which operate on
5916 files in the ELF format.
5918 * Converted to Autoconf version 2, so `configure' has more options.
5919 Run `configure --help' to see the details.
5921 * The library can now be configured to build profiling, highly-optimized
5922 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5923 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5924 `configure' enable building these extra libraries. The shared library is
5925 built by default when using both ELF and GNU ld. When shared libraries
5926 are enabled, the new library `-ldl' is available for arbitrary run-time
5927 loading of shared objects; its interface is defined in <dlfcn.h>. The
5928 new header file <link.h> gives access to the internals of the run-time
5929 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5930 application of same name on other systems and it provides information
5931 about dynamically linked binaries.
5933 * The C library now provides the run-time support code for profiling
5934 executables compiled with `-pg'. Programs can control the profiling code
5935 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5936 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5937 the support for this file format was contributed by David Mosberger-Tang.
5939 * The math code has been replaced with a math library based on fdlibm from
5940 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5941 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5942 functions. The math functions now reside in a separate library, so
5943 programs using them will need to use `-lm' their linking commands.
5945 * John C. Bowman contributed optimized ix87 assembler inline functions.
5947 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5948 mechanism similar to that found in Solaris 2. This is now used for the
5949 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5950 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5951 file controls what services are used for each individual database. This
5952 works by loading shared libraries with names specified in `nsswitch.conf',
5953 so service modules can be changed or added at any time without even
5954 relinking any program. Currently there are the file, db, and NIS based
5955 NSS services available.
5957 * The new functions `strtoq' and `strtouq' parse integer values from
5958 strings, like `strtol' and `strtoul', but they return `long long int' and
5959 `unsigned long long int' values, respectively (64-bit quantities).
5961 * The new functions `strtof' and `strtold' parse floating-point values from
5962 strings, like `strtod', but they return `float' and `long double' values,
5963 respectively (on some machines `double' and `long double' are the same).
5965 * Ulrich Drepper has contributed new implementations of the floating-point
5966 printing and reading code used in the `printf' family of functions and
5967 `strtod', `strtof', and `strtold'. These new functions are perfectly
5968 accurate, and much faster than the old ones.
5970 * The implementation of the POSIX locale model was completely rewritten by
5971 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5972 to compile the POSIX locale definition.
5974 * The former dummy implementations of the strcoll and strxfrm function are
5975 now replaced by fully functional code contributed by Ulrich Drepper. The
5976 collation information comes from the POSIX locale definitions.
5978 * The new header <langinfo.h> defines an interface for accessing
5979 various locale-dependent data (using the locale chosen with `setlocale').
5981 * Ulrich Drepper has contributed a new suite of functions for operation on
5982 wide-character and multibyte-character strings, in <wchar.h>;
5983 and classification and case conversion of wide characters, in <wctype.h>.
5984 These new functions are conforming to the ISO C, Amendement 1 specification.
5986 * There is now a second implementation of the standard I/O library available.
5987 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5988 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5990 * You can now use positional parameter specifications in format strings
5991 for the `printf' and `scanf' families of functions. For example,
5992 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5993 ``Number 6, Mr Jones''. This is mainly useful when providing different
5994 format strings for different languages, whose grammars may dictate
5995 different orderings of the values being printed. To support this
5996 feature, the interface for `register_printf_handler' has changed; see
5997 the header file <printf.h> for details.
5999 * The `printf' and `scanf' families of functions now understand a new
6000 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6001 to group numbers as indicated by the locale; for `scanf' and friends, this
6002 says to accept as valid only a number with all the proper grouping
6003 separators in the right places. In the default "C" locale, numbers are
6004 not grouped; but locales for specific countries will define the usual
6005 conventions (i.e. separate thousands with `,' in the US locale).
6007 * The pgrp functions have been regularized, slightly incompatibly but much
6008 less confusingly. The core functions are now `getpgid' and `setpgid',
6009 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6010 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6011 provided for compatibility. There is no longer an incompatible `getpgrp'
6012 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6014 * The new header file <fts.h> and suite of functions simplify programs that
6015 operate on directory trees. This code comes from 4.4 BSD.
6017 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6018 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6019 NSS scheme used in glibc.
6021 * There is a new malloc debugging hook `__memalign_hook'.
6023 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6024 `unsigned int' in <sys/types.h>. These are for compatibility only and
6025 their use is discouraged.
6027 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6028 done differently, so that it works even without GNU ld.
6030 * New function `euidaccess' checks allowed access to a file like `access',
6031 but using the effective IDs instead of the real IDs.
6033 * The time zone data files have been updated for the latest and greatest
6034 local time conventions of the countries of the world.
6036 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6039 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6040 for formatting floating-point numbers. They are provided only for
6041 compatibility; new programs should use `sprintf' instead. There are
6042 also equivalent function for the `long double' floating-point type and
6043 all functions also exist in a reentrant form.
6045 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6046 functions for maintaining the login-record files (primarily of use to
6047 system programs such as `login'), and convenient functions for
6048 allocating and initializing a pseudo-terminal (pty) device.
6050 * Ulrich Drepper has contributed new support for System V style
6051 shared memory and IPC on systems that support it.
6053 * Ulrich Drepper has contributed several miscellaneous new functions found
6054 in System V: The `hsearch' family of functions provide an effective
6055 implementation of hash tables; `a64l' and `l64a' provide a very simple
6056 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6059 * Ulrich Drepper has contributed new reentrant counterparts for the
6060 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6062 * Ulrich Drepper has contributed new, highly-optimized versions of several
6063 string functions for the i486/Pentium family of processors.
6065 * Ulrich Drepper has updated the Linux-specific code, based largely
6066 on work done in Hongjiu Lu's version of GNU libc for Linux.
6067 The GNU library now supports Linux versions 2.0.10 and later,
6068 using the ELF object file format (i[3456]86-*-linux).
6070 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6072 * David Mosberger-Tang and Richard Henderson have ported the C library
6073 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6074 dynamic linking support for ELF/Alpha.
6076 * Richard Henderson contributed several Alpha optimized assembler function
6077 for arithmetic and string handling.
6079 * Ulrich Drepper has contributed a new set of message catalog functions to
6080 support multiple languages using the <libintl.h> interface, for use with
6081 his new package GNU gettext. Translation volunteers have contributed
6082 catalogs of the library's messages in Spanish, German, and Korean.
6084 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6085 program and the `catgets' function for reading the catalog files it
6086 creates. (The <libintl.h> interface is preferred; we include the
6087 <nl_types.h> interface using `catgets' only for source compatibility with
6088 programs already written to use it.)
6090 * New header file <values.h> gives SVID-compatible names for <limits.h>
6093 * Various new macros, declarations, and small header files for compatibility
6096 * New function `group_member' is a convenient way to check if a process has
6097 a given effective group ID.
6099 * When using GCC 2.7 and later, the socket functions are now declared in a
6100 special way so that passing an argument of type `struct sockaddr_in *',
6101 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6102 `struct sockaddr *' type, does not generate a type-clash warning.
6104 * New function `error' declared in header file <error.h> is a convenient
6105 function for printing error messages and optionally exiting; this is the
6106 canonical function used in GNU programs. The new functions `err', `warn',
6107 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6108 doing the same thing.
6110 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6111 POSIX.2 `glob' function to do ~ and {...} expansion.
6113 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6114 `clearenv' which is used in POSIX.9 is also available.
6116 * New function `getsid' returns session ID number on systems that support it.
6118 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6119 files <db.h> and <mpool.h> provide a rich set of functions for several
6120 types of simple databases stored in memory and in files, and <ndbm.h> is
6121 an old `ndbm'-compatible interface using the `db' functions. Link with
6122 `-ldb' to get these functions.
6124 * New macro `strdupa' copies a string like `strdup', but uses local stack
6125 space from `alloca' instead of dynamic heap space from `malloc'.
6127 * New function `strnlen' is like `strlen' but searches only a given maximum
6128 number of characters for the null terminator. `stpncpy', `strndup' and
6129 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6132 * New function `statfs' in header <sys/statfs.h>.
6134 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6135 provide convenient functions for operating on blocks of null-terminated
6138 * A new suite of functions in <utmp.h> handle all the details of reading
6139 and writing the utmp file.
6141 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6144 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6145 completely POSIX compliant and also implemented the extended functionality
6146 to handle alternate digit representation and alternate era date formats.
6148 * Ulrich Drepper provided an implementation of the `strptime' function
6149 defined in XPG4.2 which transforms a string into a `struct tm' value.
6151 * Paul Eggert provided the tzselect shell script as part of the timezone
6152 code. The shell script makes it easy to select the correct timezone
6155 * The implementation of the malloc family of functions is completely replaced
6156 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6157 The implementation uses the mmap function (if available) and it is
6158 optimized for the use in multi threaded programs.
6160 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6161 functions. This new functionality is usable by specifying a special
6162 salt string and it is compatible with implementation on *BSD systems.
6164 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6165 `getsubopt' to handle second level command line options, `bsd_signal'
6166 to access BSD style `signal' functionality, the obsolete `regexp' style
6169 * the `lchown' function is available on system which support this
6172 * The implementation of the shadow password handling function was contributed
6175 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6177 * POSIX.1g support was added. The <sys/select.h> header is available,
6178 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6179 implementation of `getaddrinfo'.
6183 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6185 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6186 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6188 * The new function `daemon' from 4.4 BSD is useful for server programs that
6189 want to put themselves in the background.
6191 * Joel Sherrill has contributed support for several standalone boards that
6192 run without an operating system.
6194 * `printf', `scanf' and friends now accept a `q' type modifier for long
6195 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6197 * All of the code taken from BSD (notably most of the math and networking
6198 routines) has been updated from the BSD 4.4-Lite release.
6200 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6202 * The new functions `getdomainname' and `setdomainname' fetch or change the
6203 YP/NIS domain name. These are system calls which exist on systems which
6206 * The time zone data files have been updated for the latest international
6209 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6210 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6214 * The C library now includes support for Sun RPC, from Sun's free
6215 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6216 are included. (There is still no support for YP.)
6218 * Tom Quinn has contributed a port of the C library to SGI machines running
6219 Irix 4 (mips-sgi-irix4).
6221 * The new `lockf' function is a simplified interface to the locking
6222 facilities of `fcntl', included for compatibility.
6224 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6226 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6228 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6231 * The error message printed by `assert' for a failed assertion now includes
6232 the name of the program (if using GNU ld) and the name of the calling
6233 function (with versions of GCC that support this).
6235 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6237 * The library now includes the <sys/mman.h> header file and memory
6238 management functions `mmap', `munmap', `mprotect', `msync', and
6239 `madvise', on systems that support those facilities.
6241 * The interface for `mcheck' has changed slightly: the function called to
6242 abort the program when an allocation inconsistency is detected now takes
6243 an argument that indicates the type of failure. The new function
6244 `mprobe' lets you request a consistency check for a particular block at
6245 any time (checks are normally done only when you call `free' or `realloc'
6248 * It is now possible to easily cross-compile the C library, building on one
6249 system a library to run on another machine and/or operating system. All
6250 you need to do is set the variable `HOST_CC' in `configparms' to the
6251 native compiler for programs to run on the machine you are building on (a
6252 few generator programs are used on Unix systems); set `CC' to the
6255 * The new function `fexecve' (only implemented on the GNU system) executes
6256 a program file given a file descriptor already open on the file.
6260 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6261 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6263 * You can set the variable `libprefix' in `configparms' to specify a prefix
6264 to be prepended to installed library files; this makes it easy to install
6265 the GNU C library to be linked as `-lgnuc' or whatever.
6267 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6268 copies a limited number of characters from a string, and returns the
6269 address of the last character written.
6271 * You no longer need to check for whether the installed `stddef.h' is
6272 compatible with the GNU C library. configure now checks for you.
6274 * You can now define a per-stream `fileno' function to convert the
6275 stream's cookie into an integral file descriptor.
6277 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6278 allocates zero bytes of storage, and returns a unique pointer which
6279 you can pass to `realloc' or `free'. The behavior is undefined if
6280 you dereference this pointer.
6282 * The C library now runs on Sony NEWS m68k machines running either
6283 NewsOS 3 or NewsOS 4.
6285 * The new `syscall' function is a system-dependent primitive function
6286 for invoking system calls. It has the canonical behavior on Unix
6287 systems, including unreliable return values for some calls (such as
6288 `pipe', `fork' and `getppid').
6290 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6291 to `EAGAIN', which is the preferred name. On systems whose kernels
6292 use two distinct codes, the C library now translates EWOULDBLOCK to
6293 EAGAIN in every system call function.
6297 * The GNU C Library Reference Manual is now distributed with the library.
6298 `make dvi' will produce a DVI file of the printed manual.
6299 `make info' will produce Info files that you can read on line using C-h i
6300 in Emacs or the `info' program.
6301 Please send comments on the manual to bug-glibc-manual@gnu.org.
6303 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6305 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6307 * Jason Merrill has contributed a port to the Sequent Symmetry running
6308 Dynix version 3 (i386-sequent-dynix).
6310 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6311 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6313 * New function `memory_warnings' lets you arrange to get warnings when
6314 malloc is running out of memory to allocate, like Emacs gives you.
6316 * The C library now contains the relocating allocator used in Emacs 19 for
6317 its editing buffers. This allocator (ralloc) minimizes allocation
6318 overhead and fragmentation by moving allocated regions around whenever it
6319 needs to. You always refer to a ralloc'd region with a "handle" (a
6320 pointer to a pointer--an object of type `void **').
6322 * There is a new `printf' format: `%m' gives you the string corresponding
6323 to the error code in `errno'.
6325 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6326 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6327 pass, the `a' modifier says to fill in a `char **' you pass with a
6330 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6331 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6332 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6334 * `mkstemp' is a traditional Unix function to atomically create and open a
6335 uniquely-named temporary file.
6339 * The standard location for the file that says what the local timezone is
6340 has changed again. It is now `/usr/local/etc/localtime' (or more
6341 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6343 * The distribution no longer contains any files with names longer than 14
6346 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6347 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6349 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6353 * The configuration process has changed quite a bit. The `configure'
6354 script is now used just like the configuration scripts for other GNU
6355 packages. The `sysdeps' directory hierarchy is much rearranged.
6356 The file `INSTALL' explains the new scheme in detail.
6358 * The header files no longer need to be processed into ANSI C and
6359 traditional C versions. There is just one set of files to install, and
6360 it will work with ANSI or old C compilers (including `gcc -traditional').
6362 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6363 MIPS DECStation running Ultrix 4.
6365 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6366 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6367 made itself into a shared library.
6369 * Yet further improved support for the i386, running 4.3 BSD-like systems
6370 (such as Mach 3 with the Unix single-server), or System V.
6372 * New function `strncasecmp' to do case-insensitive string comparison
6373 with limited length.
6375 * New function `strsep' is a reentrant alternative to `strtok'.
6377 * New functions `scandir' and `alphasort' for searching directories.
6379 * New function `setenv' is a better interface to `putenv'.
6381 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6382 function for traversing a directory tree.
6384 * The GNU obstack package is now also part of the C library.
6385 The new function `open_obstack_stream' creates a stdio stream that
6386 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6387 formatted output directly to an obstack.
6389 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6390 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6392 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6394 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6395 things to your strings.
6397 * There are some new test programs: test-fseek, testmb, and testrand.
6399 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6400 These ports are not finished, but are a good starting place for really
6401 supporting those systems.
6403 * `/etc/localtime' is now the standard location for the file that says what
6404 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6405 This follows the general principle that `/etc' is the place for all local
6406 configuration files.
6408 * The C library header files now use `extern "C"' when used by the C++
6409 compiler, so the C library should now work with C++ code.
6411 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6412 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6415 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6416 function which uses the `merge sort' algorithm, and is said to be
6417 significantly faster than the old GNU `qsort' function. Merge sort is
6418 now the standard `qsort' function. The new algorithm can require a lot
6419 of temporary storage; so, the old sorting function is called when the
6420 required storage is not available.
6422 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6423 provides the Unix `crypt' function, plus some other entry points.
6425 * The code and header files taken from 4.4 BSD have been updated with the
6426 latest files released from Berkeley.
6428 ----------------------------------------------------------------------
6431 Permission is granted to anyone to make or distribute verbatim copies
6432 of this document as received, in any medium, provided that the
6433 copyright notice and this permission notice are preserved,
6434 thus giving the recipient permission to redistribute in turn.
6436 Permission is granted to distribute modified versions
6437 of this document, or of portions of it,
6438 under the above conditions, provided also that they
6439 carry prominent notices stating who last changed them.
6442 version-control: never