1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2021 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _SC_SIGSTKSZ_SOURCE or
13 _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
14 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
15 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
17 * The dynamic linker implements the --list-diagnostics option, printing
18 a dump of information related to IFUNC resolver operation and
19 glibc-hwcaps subdirectory selection.
21 * On Linux, the function execveat has been added. It operates similar to
22 execve and it is is already used to implement fexecve without requiring
23 /proc to be mounted. However, different than fexecve, if the syscall is not
24 supported by the kernel an error is returned instead of trying a fallback.
26 * The ISO C2X function timespec_getres has been added.
28 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
29 C2X, is supported to enable declarations of functions defined in Annex F
30 of C2X. Those declarations are also enabled when
31 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
32 defined, and when _GNU_SOURCE is defined.
34 * On powerpc64*, glibc can now be compiled without scv support using the
35 --disable-scv configure option.
37 Deprecated and removed features, and other changes affecting compatibility:
39 * The function pthread_mutex_consistent_np has been deprecated; programs
40 should use the equivalent standard function pthread_mutex_consistent
43 * The function pthread_mutexattr_getrobust_np has been deprecated;
44 programs should use the equivalent standard function
45 pthread_mutexattr_getrobust instead.
47 * The function pthread_mutexattr_setrobust_np has been deprecated;
48 programs should use the equivalent standard function
49 pthread_mutexattr_setrobust instead.
51 * The function pthread_yield has been deprecated; programs should use
52 the equivalent standard function sched_yield instead.
54 Changes to build and runtime requirements:
56 * On Linux, the shm_open, sem_open, and related functions now expect the
57 file shared memory file system to be mounted at /dev/shm. These functions
58 no longer search among the system's mount points for a suitable
59 replacement if /dev/shm is not available.
61 Security related changes:
63 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
64 a request for netgroup lookup, may crash due to a double-free,
65 potentially resulting in degraded service or Denial of Service on the
66 local system. Reported by Chris Schanzle.
68 CVE-2021-33574: The mq_notify function has a potential use-after-free
69 issue when using a notification type of SIGEV_THREAD and a thread
70 attribute with a non-default affinity mask.
72 The following bugs are resolved with this release:
74 [The release manager will add the list generated by
75 scripts/list-fixed-bugs.py just before the release.]
82 * The dynamic linker accepts the --list-tunables argument which prints
83 all the supported tunables. This option is disable if glibc is
84 configured with tunables disabled (--enable-tunables=no).
86 * The dynamic linker accepts the --argv0 argument and provides opportunity
87 to change argv[0] string.
89 * The dynamic linker loads optimized implementations of shared objects
90 from subdirectories under the glibc-hwcaps directory on the library
91 search path if the system's capabilities meet the requirements for
92 that subdirectory. Initially supported subdirectories include
93 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
94 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
95 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
96 subdirectory names correspond to the vendor-independent x86-64
97 microarchitecture levels defined in the x86-64 psABI supplement.
99 * The new --help option of the dynamic linker provides usage and
100 information and library search path diagnostics.
102 * The mallinfo2 function is added to report statistics as per mallinfo,
103 but with larger field widths to accurately report values that are
104 larger than fit in an integer.
106 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
108 * Support for the RISC-V ISA running on Linux has been expanded to run on
109 32-bit hardware. This is supported for the following ISA and ABI pairs:
115 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
118 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
119 glibc may use additional checks that may have an additional performance
120 overhead. At present these checks are available only on LLVM 9 and later.
121 The latest GCC available at this time (10.2) does not support this level of
124 Deprecated and removed features, and other changes affecting compatibility:
126 * The mallinfo function is marked deprecated. Callers should call
129 * When dlopen is used in statically linked programs, alternative library
130 implementations from HWCAP subdirectories are no longer loaded.
131 Instead, the default implementation is used.
133 * The deprecated <sys/vtimes.h> header and the function vtimes have been
134 removed. To support old binaries, the vtimes function continues to exist
135 as a compatibility symbol. Applications should use the getrlimit or
138 * Following a change in the tzdata 2018a release upstream, the zdump
139 program is now installed in the /usr/bin subdirectory. Previously,
140 the /usr/sbin subdirectory was used.
142 * On s390(x), the type float_t is now derived from the macro
143 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
144 hardcoded to double. This does not affect the ABI of any libraries
145 that are part of the GNU C Library, but may affect the ABI of other
146 libraries that use this type in their interfaces. The new definition
147 improves consistency with compiler behavior in many scenarios.
149 * A future version of glibc will stop loading shared objects from the
150 "tls" subdirectories on the library search path, the subdirectory that
151 corresponds to the AT_PLATFORM system name, and also stop employing
152 the legacy AT_HWCAP search mechanism. Applications should switch to
153 the new glibc-hwcaps mechanism instead; if they do not do that, only
154 the baseline version (directly from the search path directory) will be
157 Changes to build and runtime requirements:
159 * On Linux, the system administrator needs to configure /dev/pts with
160 the intended access modes for pseudo-terminals. glibc no longer
161 attemps to adjust permissions of terminal devices. The previous glibc
162 defaults ("tty" group, user read/write and group write) already
163 corresponded to what most systems used, so that grantpt did not
164 perform any adjustments.
166 * On Linux, the posix_openpt and getpt functions no longer attempt to
167 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
168 (and pseudo-terminals are supported), a devpts file system is mounted
169 on /dev/pts. Current systems already meet these requirements.
171 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
173 Security related changes:
175 CVE-2021-3326: An assertion failure during conversion from the
176 ISO-20220-JP-3 character set using the iconv function has been fixed.
177 This assertion was triggered by certain valid inputs in which the
178 converted output contains a combined sequence of two wide characters
179 crossing a buffer boundary. Reported by Tavis Ormandy.
181 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
182 invoked with input containing redundant shift sequences in the IBM1364,
183 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
185 CVE-2020-29562: An assertion failure has been fixed in the iconv function
186 when invoked with UCS4 input containing an invalid character.
188 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
189 invoked with EUC-KR input containing invalid multibyte input sequences.
191 The following bugs are resolved with this release:
193 [10635] libc: realpath portability patches
194 [16124] dynamic-link: ld.so should allow to change argv[0]
195 [17924] malloc: 'free' should not set errno
196 [18683] libc: Linux faccessat implementation can incorrectly ignore
198 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
199 [23091] hurd: missing waitid support
200 [23249] libc: Epyc and other current AMD CPUs do not select the
201 "haswell" platform subdirectory
202 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
204 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
206 [24941] libc: Make grantpt usable after multi-threaded fork in more
208 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
209 [24973] locale: iconv encounters segmentation fault when converting
210 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
211 [25399] string: undefined reference to `__warn_memset_zero_len' when
212 changing gnuc version
213 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
215 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
217 [25971] libc: s390 bits/hwcap.h out of sync with kernel
218 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
219 [26100] libc: Race in syslog(3) with regards to tag printing.
220 [26124] libc: Export <cpu-features.h>
221 [26130] nscd: Inconsistent nscd cache during pruning
222 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
223 [26224] locale: iconv hangs when converting some invalid inputs from
224 several IBM character sets (CVE-2020-27618)
225 [26341] libc: realpath cyclically call __alloca(path_max) to consume
227 [26343] manual: invalid documented return type for strerrorname_np(),
228 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
229 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
231 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
233 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
234 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
236 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
237 [26553] libc: mtx_init allows type set to "mtx_recursive" only
238 [26555] string: strerrorname_np does not return the documented value
239 [26592] libc: pointer arithmetic overflows in realpath
240 [26600] network: Transaction ID collisions cause slow DNS lookups in
242 [26606] libc: [2.33 Regression] pselect is broken on x32
243 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
244 [26620] glob: fnmatch with collating symbols results in segmentation
246 [26625] libc: [2.33 Regression] CET is disabled
247 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
248 at the end of a memory mapping
249 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
250 by the caller to the kernel
251 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
252 [26647] build: [-Werror=array-parameter=] due to different
253 declarations for __sigsetjmp
254 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
256 [26649] stdio: printf should handle non-normal x86 long double numbers
257 gracefully (CVE-2020-29573)
258 [26686] build: -Warray-parameter instances building with GCC 11
259 [26687] build: -Warray-bounds instances building with GCC 11
260 [26690] stdio: Aliasing violation in __vfscanf_internal
261 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
262 [26726] build: GCC warning calling new_composite_name with an array of
264 [26736] libc: FAIL: misc/tst-sysvshm-linux
265 [26737] libc: Random FAIL: rt/tst-shm
266 [26791] libc: Missing O_CLOEXEC in sysconf.c
267 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
269 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
271 [26818] string: aarch64: string tests may run ifunc variants that are
273 [26821] libc: Memory leak test failures on Fedora 33
274 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
275 FSGSBASE/LM/RDRAND check failure
276 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
278 [26853] libc: aarch64: Missing unwind information in statically linked
280 [26923] locale: Assertion failure in iconv when converting invalid
281 UCS4 (CVE-2020-29562)
282 [26926] dynamic-link: aarch64: library dependencies are not bti
284 [26932] libc: sh: Multiple floating point functions defined as stubs
286 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
288 [26988] dynamic-link: aarch64: BTI mprotect address is not page
290 [27002] build: libc_freeres_fn build failure with GCC 11
291 [27004] dynamic-link: ld.so is miscompiled by GCC 11
292 [27008] dynamic-link: ld.so.cache should have endianness markup
293 [27042] libc: [alpha] anonymous union in struct stat confuses
295 [27053] libc: Conformance regression in system(3) (and probably also
297 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
299 [27077] network: Do not reload /etc/nsswitch.conf from chroot
300 [27083] libc: Unsafe unbounded alloca in addmntent
301 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
303 [27130] string: "rep movsb" performance issue
304 [27150] libc: alpha: wait4() is unavailable in static linking
305 [27177] dynamic-link:
306 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
308 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
309 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
310 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
311 related to combining characters (CVE-2021-3326)
318 * Unicode 13.0.0 Support: Character encoding, character type info, and
319 transliteration tables are all updated to Unicode 13.0.0, using
320 generator scripts contributed by Mike FABIAN (Red Hat).
322 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
324 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
325 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
326 Three ABIs are supported:
332 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
333 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
335 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
336 DT_DEPAUDIT dynamic section entries of the main executable.
338 * powerpc64le supports IEEE128 long double libm/libc redirects when
339 using -mabi=ieeelongdouble to compile C code on supported GCC
340 toolchains. It is recommended to use GCC 8 or newer when testing
343 * To help detect buffer overflows and other out-of-bounds accesses
344 several APIs have been annotated with GCC 'access' attribute. This
345 should help GCC 10 issue better warnings.
347 * On Linux, functions pthread_attr_setsigmask_np and
348 pthread_attr_getsigmask_np have been added. They allow applications
349 to specify the signal mask of a thread created with pthread_create.
351 * The GNU C Library now provides the header file <sys/single_threaded.h>
352 which declares the variable __libc_single_threaded. Applications are
353 encouraged to use this variable for single-thread optimizations,
354 instead of weak references to symbols historically defined in
357 * The functions sigabbrev_np and sigdescr_np have been added. The
358 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
359 SIGHUP) while sigdescr_np returns a string describing the signal number
360 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
361 attempt to translate the return description, both functions return
362 NULL for an invalid signal number.
364 They should be used instead of sys_siglist or sys_sigabbrev and they
365 are both thread and async-signal safe. These functions are GNU extensions.
367 * The functions strerrorname_np and strerrordesc_np have been added. The
368 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
369 while strerrordesc_np returns a string describing the error number
370 (e.g "Invalid argument" for EINVAL). Different than strerror,
371 strerrordesc_np does not attempt to translate the return description, both
372 functions return NULL for an invalid error number.
374 They should be used instead of sys_errlist and sys_nerr, both are
375 thread and async-signal safe. These functions are GNU extensions.
377 * AArch64 now supports standard branch protection security hardening
378 in glibc when it is built with a GCC that is configured with
379 --enable-standard-branch-protection (or if -mbranch-protection=standard
380 flag is passed when building both GCC target libraries and glibc,
381 in either case a custom GCC is needed). This includes branch target
382 identification (BTI) and pointer authentication for return addresses
383 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
384 extensions respectively for the protection to be effective,
385 otherwise the used instructions are nops. User code can use PAC-RET
386 without libc support, but BTI requires a libc that is built with BTI
387 support, otherwise runtime objects linked into user code will not be
390 Deprecated and removed features, and other changes affecting compatibility:
392 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
393 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
394 RPC header files. Backward compatibility for old programs is kept
395 only for architectures and ABIs that have been added in or before
396 glibc 2.31. New programs need to use TI-RPC
397 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
398 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
400 * Remove configure option --enable-obsolete-nsl. libnsl is only built
401 as shared library for backward compatibility and the NSS modules "nis"
402 and "nisplus" are not built at all and libnsl's headers aren't
403 installed. This compatibility is kept only for architectures and ABIs
404 that have been added in or before version 2.28. Replacement
405 implementations based on TI-RPC, which additionally support IPv6, are
406 available from <https://github.com/thkukuk/>. This change does not
407 affect the "compat" NSS module, which does not depend on libnsl
408 since 2.27 and thus can be used without NIS.
410 * The deprecated <sys/sysctl.h> header and the sysctl function have been
411 removed. To support old binaries, the sysctl function continues to
412 exist as a compatibility symbol (on those architectures which had it),
413 but always fails with ENOSYS. This reflects the removal of the system
414 call from all architectures, starting with Linux 5.5.
416 * The sstk function is no longer available to newly linked binaries.
417 Its implementation always returned with a failure, and the function
418 was not declared in any header file.
420 * The legacy signal handling functions siginterrupt, sigpause, sighold,
421 sigrelse, sigignore and sigset, and the sigmask macro have been
422 deprecated. Applications should use the sigsuspend, sigprocmask and
423 sigaction functions instead.
425 * ldconfig now defaults to the new format for ld.so.cache. glibc has
426 already supported this format for almost 20 years.
428 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
429 are no longer available to newly linked binaries, and their declarations
430 have been removed from <string.h>. They are exported solely as
431 compatibility symbols to support old binaries. All programs should use
434 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
435 are no longer available to newly linked binaries, and their declarations
436 have been removed from <stdio.h>. They are exported solely as
437 compatibility symbols to support old binaries. All programs should use
438 strerror or strerror_r instead.
440 * Both strerror and strerror_l now share the same internal buffer in the
441 calling thread, meaning that the returned string pointer may be invalided
442 or contents might be overwritten on subsequent calls in the same thread or
443 if the thread is terminated. It makes strerror MT-safe.
445 * Using weak references to libpthread functions such as pthread_create
446 or pthread_key_create to detect the singled-threaded nature of a
447 program is an obsolescent feature. Future versions of glibc will
448 define pthread_create within libc.so.6 itself, so such checks will
449 always flag the program as multi-threaded. Applications should check
450 the __libc_single_threaded variable declared in
451 <sys/single_threaded.h> instead.
453 * The "files" NSS module no longer supports the "key" database (used for
454 secure RPC). The contents of the /etc/publickey file will be ignored,
455 regardless of the settings in /etc/nsswitch.conf. (This method of
456 storing RPC keys only supported the obsolete and insecure AUTH_DES
457 flavor of secure RPC.)
459 * The __morecore and __after_morecore_hook malloc hooks and the default
460 implementation __default_morecore have been deprecated. Applications
461 should use malloc interposition to change malloc behavior, and mmap to
462 allocate anonymous memory. A future version of glibc may require that
463 applications which use the malloc hooks must preload a special shared
464 object, to enable the hooks.
466 * The hesiod NSS module has been deprecated and will be removed in a
467 future version of glibc. System administrators are encouraged to
468 switch to other approaches for networked account databases, such as
471 Changes to build and runtime requirements:
473 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
474 long double redirects.
476 Security related changes:
478 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
479 invoked with the -c option and when processing invalid multi-byte input
480 sequences. Reported by Jan Engelhardt.
482 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
483 corruption when they were passed a pseudo-zero argument. Reported by Guido
484 Vranken / ForAllSecure Mayhem.
486 CVE-2020-1752: A use-after-free vulnerability in the glob function when
487 expanding ~user has been fixed.
489 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
490 memmove functions has been fixed. Discovered by Jason Royes and Samual
491 Dytrych of the Cisco Security Assessment and Penetration Team (See
494 The following bugs are resolved with this release:
496 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
497 [10441] manual: Backtraces code example lacks error checking
498 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
499 timer_sigev_thread dangerous
500 [14231] stdio: stdio-common tests memory requirements
501 [14578] libc: /proc-based emulation for lchmod, fchmodat
502 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
503 filtee has constructor
504 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
505 sequences (CVE-2016-10228)
506 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
507 character entities for infinity & pi
508 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
509 segfaults in applications
510 [20543] libc: Please move from .gnu.linkonce to comdat
511 [22489] network: gcc warns about implicit convertion in
512 ICMP6_FILTER_SETPASS with -Wsign-conversion
513 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
514 [23294] math: Complex _FloatN functions are redirected to the wrong
515 function with -mlong-double-64
516 [23296] libc: Data race in setting function descriptor during lazy
518 [23668] dynamic-link: ldconfig: Default to the new format for
520 [23819] hurd: hurd: Add C11 thread support
521 [23990] build: test-container error out on failure to exec child.
522 [23991] build: shell-container typo in run_command_array
523 [24638] manual: Error in example of parsing a template string
524 [24654] manual: Wrong declaration of wcschr in libc manual
525 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
527 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
528 dynamically loaded dsos
529 [25098] nptl: nptl: ctype classification functions are not AS-Safe
530 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
532 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
533 restore EAX, ECX and EDX
534 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
535 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
536 [25420] network: Race condition in resolv_conf.c can result in caching
537 stale configuration forever
538 [25487] math: sinl() stack corruption from crafted input
540 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
542 [25523] libc: MIPS/Linux inline syscall template is miscompiled
543 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
545 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
546 on 32 bit and old kernel
547 [25635] libc: arm: Wrong sysdep order selection for soft-fp
548 [25639] localedata: Some names of days and months wrongly spelt in
550 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
551 amount of sigset_t bytes
552 [25691] stdio: printf: memory leak when printing long multibyte
554 [25715] libc: system() returns wrong errors when posix_spawn fails
555 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
556 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
557 state for conversions that produce two Unicode code points
558 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
559 for linux x86_64 leads to livelock
560 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
561 test failures, invalid instruction in ld.so
562 [25790] glob: Typo in tst-fnmatch.input
563 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
565 [25819] localedata: Update locale data to Unicode 13.0.0
566 [25824] libc: Abnormal function of strnlen in aarch64
567 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
568 [25896] libc: Incorrect prctl
569 [25902] libc: Bad LOADARGS_N
570 [25905] dynamic-link: VSX registers are corrupted during PLT
571 resolution when glibc is built with --disable-multi-arch and --with-
573 [25933] string: Off by one error in __strncmp_avx2 when
574 length=VEC_SIZE*4 and strings are at page boundaries can cause a
576 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
577 exiting detached thread
578 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
580 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
582 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
583 [26073] math: getpayload() has wrong return value
584 [26076] dynamic-link: dlmopen crashes after failing to load
585 dependencies in audit mode
586 [26120] localedata: column width of of some Korean
587 JUNGSEONG/JONGSEONG characters wrong (should be 0)
588 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
589 [26133] libc: Incorrect need_arch_feature_F16C
590 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
592 [26149] libc: PKU is usable only if OSPKE is set
593 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
595 [26208] libc: Incorrect bit_cpu_CLFSH
596 [26210] network: Incorrect use of hidden symbols for global sunrpc
598 [26211] stdio: printf integer overflow calculating allocation size
599 [26214] stdio: printf_fp double free
600 [26215] stdio: printf_fp memory leak
601 [26232] time: FAIL: support/tst-timespec for 32-bit targets
602 [26258] nss: nss_compat should not read input files with mmap
603 [26332] string: Incorrect cache line size load causes memory
611 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
612 enable features from the draft ISO C2X standard. Only some features from
613 this draft standard are supported by the GNU C Library, and as the draft
614 is under active development, the set of features enabled by this macro is
615 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
616 by compiling with "gcc -std=gnu2x".
618 * The <math.h> functions that round their results to a narrower type now
619 have corresponding type-generic macros in <tgmath.h>, as defined in TS
620 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
621 Clarification Request 13 to TS 18661-3.
623 * The function pthread_clockjoin_np has been added, enabling join with a
624 terminated thread with a specific clock. It allows waiting against
625 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
627 * New locale added: mnw_MM (Mon language spoken in Myanmar).
629 * The DNS stub resolver will optionally send the AD (authenticated data) bit
630 in queries if the trust-ad option is set via the options directive in
631 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
632 mode, the AD bit, as provided by the name server, is available to
633 applications which call res_search and related functions. In the default
634 mode, the AD bit is not set in queries, and it is automatically cleared in
635 responses, indicating a lack of DNSSEC validation. (Therefore, the name
636 servers and the network path to them are treated as untrusted.)
638 Deprecated and removed features, and other changes affecting compatibility:
640 * The totalorder and totalordermag functions, and the corresponding
641 functions for other floating-point types, now take pointer arguments to
642 avoid signaling NaNs possibly being converted to quiet NaNs in argument
643 passing. This is in accordance with the resolution of Clarification
644 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
645 floating-point arguments directly will continue to work.
647 * The obsolete function stime is no longer available to newly linked
648 binaries, and its declaration has been removed from <time.h>.
649 Programs that set the system time should use clock_settime instead.
651 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
652 in a future version of glibc. In this release, the header still exists
653 but calling ftime will cause a compiler warning. All programs should use
654 gettimeofday or clock_gettime instead.
656 * The gettimeofday function no longer reports information about a
657 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
658 many years, as it cannot handle the full complexity of the world's
659 timezones, but hitherto we have supported it on a best-effort basis.
660 Changes required to support 64-bit time_t on 32-bit architectures have
661 made this no longer practical.
663 As of this release, callers of gettimeofday with a non-null 'tzp' argument
664 should expect to receive a 'struct timezone' whose tz_minuteswest and
665 tz_dsttime fields are zero. (For efficiency reasons, this does not always
666 happen on a few Linux-based ports. This will be corrected in a future
669 All callers should supply a null pointer for the 'tzp' argument to
670 gettimeofday. For accurate information about the time zone associated
671 with the current time, use the localtime function.
673 gettimeofday itself is obsolescent according to POSIX. We have no plans
674 to remove access to this function, but portable programs should consider
675 using clock_gettime instead.
677 * The settimeofday function can still be used to set a system-wide time
678 zone when the operating system supports it. This is because the Linux
679 kernel reused the API, on some architectures, to describe a system-wide
680 time-zone-like offset between the software clock maintained by the kernel,
681 and the "RTC" clock that keeps time when the system is shut down.
683 However, to reduce the odds of this offset being set by accident,
684 settimeofday can no longer be used to set the time and the offset
685 simultaneously. If both of its two arguments are non-null, the call
686 will fail (setting errno to EINVAL).
688 Callers attempting to set this offset should also be prepared for the call
689 to fail and set errno to ENOSYS; this already happens on the Hurd and on
690 some Linux architectures. The Linux kernel maintainers are discussing a
691 more principled replacement for the reused API. After a replacement
692 becomes available, we will change settimeofday to fail with ENOSYS on all
693 platforms when its 'tzp' argument is not a null pointer.
695 settimeofday itself is obsolescent according to POSIX. Programs that set
696 the system time should use clock_settime and/or the adjtime family of
697 functions instead. We may cease to make settimeofday available to newly
698 linked binaries after there is a replacement for Linux's time-zone-like
701 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
702 the optional CAS instruction is implemented (for instance, LEON processors
703 are still supported, but SuperSPARC processors are not).
705 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
708 * If a lazy binding failure happens during dlopen, during the execution of
709 an ELF constructor, the process is now terminated. Previously, the
710 dynamic loader would return NULL from dlopen, with the lazy binding error
711 captured in a dlerror message. In general, this is unsafe because
712 resetting the stack in an arbitrary function call is not possible.
714 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
715 executable stack unless explicitly configured at build time to require
716 minimum kernel version 4.8 or newer. This is because executing
717 floating-point branches on a non-executable stack on Linux kernels prior to
718 4.8 can lead to application crashes for some MIPS configurations. While
719 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
720 expected to enable non-executable stack by default with PT_GNU_STACK by
721 default and is thus likely to trigger a crash on older kernels.
723 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
724 non-executable stack while dropping support for older kernels.
726 * System call wrappers for time system calls now use the new time64 system
727 calls when available. On 32-bit targets, these wrappers attempt to call
728 the new system calls first and fall back to the older 32-bit time system
729 calls if they are not present. This may cause issues in environments
730 that cannot handle unsupported system calls gracefully by returning
731 -ENOSYS. Seccomp sandboxes are affected by this issue.
733 Changes to build and runtime requirements:
735 * It is no longer necessary to have recent Linux kernel headers to build
736 working (non-stub) system call wrappers on all architectures except 64-bit
737 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
739 * The ChangeLog file is no longer present in the toplevel directory of the
740 source tree. ChangeLog files are located in the ChangeLog.old directory as
741 ChangeLog.N where the highest N has the latest entries.
743 Security related changes:
745 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
746 out-of-bounds write when executed in a signal frame context.
748 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
749 environment variable during program execution after a security
750 transition, allowing local attackers to restrict the possible mapping
751 addresses for loaded libraries and thus bypass ASLR for a setuid
752 program. Reported by Marcin Kościelnicki.
754 The following bugs are resolved with this release:
756 [12031] localedata: iconv -t ascii//translit with Greek characters
757 [15813] libc: Multiple issues in __gen_tempname
758 [17726] libc: [arm, sparc] profil_counter should be compat symbol
759 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
760 [19767] libc: vdso is not used with static linking
761 [19903] hurd: Shared mappings not being inherited by children processes
762 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
763 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
765 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
766 Symbols-A/B Unicode blocks
767 [23518] libc: Eliminate __libc_utmp_jump_table
768 [24026] malloc: malloc_info() returns wrong numbers
769 [24054] localedata: Many locales are missing date_fmt
770 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
771 [24304] dynamic-link: Lazy binding failure during ELF
772 constructors/destructors is not fatal
773 [24376] libc: RISC-V symbol size confusion with _start
774 [24682] localedata: zh_CN first weekday should be Monday per GB/T
776 [24824] libc: test-in-container does not install charmap files compatible
778 [24844] regex: regex bad pointer / leakage if malloc fails
779 [24867] malloc: Unintended malloc_info formatting changes
780 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
781 [24880] libc: login: utmp implementation uses struct flock with fcntl64
782 [24882] libc: login: pututline uses potentially outdated cache
783 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
784 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
786 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
788 [24930] dynamic-link: dlopen of PIE executable can result in
789 _dl_allocate_tls_init assertion failure
790 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
791 (stringop-overflow error)
792 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
793 functions other can lead to crashes
794 [24967] libc: jemalloc static linking causes runtime failure
795 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
797 [25035] libc: sbrk() failure handled poorly in tunables_strdup
798 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
799 [25097] libc: new -Warray-bounds with GCC 10
800 [25112] dynamic-link: dlopen must not make new objects accessible when it
801 still can fail with an error
802 [25139] localedata: Please add the new mnw_MM locale
803 [25149] regex: Array bounds violation in proceed_next_node
804 [25157] dynamic-link: Audit cookie for the dynamic loader is not
805 initialized correctly
806 [25189] libc: glibc's __glibc_has_include causes issues with clang
808 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
810 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
811 binaries (CVE-2019-19126)
812 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
814 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
816 [25232] string: <string.h> does not enable const correctness for strchr et
818 [25233] localedata: Consider "." as the thousands separator for sl_SI
820 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
821 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
822 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
824 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
825 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
827 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
828 (dl_initfirst) link map pointer
829 [25401] malloc: pvalloc must not have __attribute_alloc_size__
830 [25423] libc: Array overflow in backtrace on powerpc
831 [25425] network: Missing call to __resolv_context_put in
832 getaddrinfo.c:gethosts
839 * Unicode 12.1.0 Support: Character encoding, character type info, and
840 transliteration tables are all updated to Unicode 12.1.0, using
841 generator scripts contributed by Mike FABIAN (Red Hat).
843 * The dynamic linker accepts the --preload argument to preload shared
844 objects, in addition to the LD_PRELOAD environment variable.
846 * The twalk_r function has been added. It is similar to the existing
847 twalk function, but it passes an additional caller-supplied argument
848 to the callback function.
850 * On Linux, the getdents64, gettid, and tgkill functions have been added.
852 * Minguo (Republic of China) calendar support has been added as an
853 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
856 * The entry for the new Japanese era has been added for ja_JP locale.
858 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
859 pvalloc, memalign, and posix_memalign fail now with total object size
860 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
861 pointer subtraction within the allocated object, where results might
862 overflow the ptrdiff_t type.
864 * The dynamic linker no longer refuses to load objects which reference
865 versioned symbols whose implementation has moved to a different soname
866 since the object has been linked. The old error message, symbol
867 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
868 link time reference, is gone.
870 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
871 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
872 functions. These behave similarly to their "timed" equivalents, but also
873 accept a clockid_t parameter to determine which clock their timeout should
874 be measured against. All functions allow waiting against CLOCK_MONOTONIC
875 and CLOCK_REALTIME. The decision of which clock to be used is made at the
876 time of the wait (unlike with pthread_condattr_setclock, which requires
877 the clock choice at initialization time).
879 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
880 work, new resolvers can use a second argument which can be extended in
881 the future, currently it contains the AT_HWCAP2 value.
883 Deprecated and removed features, and other changes affecting compatibility:
885 * The copy_file_range function fails with ENOSYS if the kernel does not
886 support the system call of the same name. Previously, user space
887 emulation was performed, but its behavior did not match the kernel
888 behavior, which was deemed too confusing. Applications which use the
889 copy_file_range function can no longer rely on glibc to provide a fallback
890 on kernels that do not support the copy_file_range system call, and if
891 this function returns ENOSYS, they will need to use their own fallback.
892 Support for copy_file_range for most architectures was added in version
893 4.5 of the mainline Linux kernel.
895 * The functions clock_gettime, clock_getres, clock_settime,
896 clock_getcpuclockid, clock_nanosleep were removed from the librt library
897 for new applications (on architectures which had them). Instead, the
898 definitions in libc will be used automatically, which have been available
901 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
902 and <sys/stropts.h> have been removed.
904 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
905 resolver flag (deprecated in glibc 2.25) have been removed.
907 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
908 resolver have been removed from <resolv.h>.
910 * With --enable-bind-now, installed programs are now linked with the
913 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
914 configurations) has been removed, following the deprecation of this
915 subarchitecture in version 8 of GCC, and its removal in version 9.
917 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
918 header have been removed.
920 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
921 deprecated and will be removed from a future version of glibc.
922 Application should directly access /proc instead. For obtaining random
923 bits, the getentropy function can be used.
925 Changes to build and runtime requirements:
927 * GCC 6.2 or later is required to build the GNU C Library.
929 Older GCC versions and non-GNU compilers are still supported when
930 compiling programs that use the GNU C Library.
932 Security related changes:
934 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
935 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
936 has undefined behavior. On x32, the size_t argument may be passed
937 in the lower 32 bits of the 64-bit RDX register with non-zero upper
938 32 bits. When it happened with the sign bit of RDX register set,
939 memcmp gave the wrong result since it treated the size argument as
940 zero. Reported by H.J. Lu.
942 CVE-2019-9169: Attempted case-insensitive regular-expression match
943 via proceed_next_node in posix/regexec.c leads to heap-based buffer
944 over-read. Reported by Hongxu Chen.
946 The following bugs are resolved with this release:
948 [2872] locale: Transliteration Cyrillic -> ASCII fails
949 [6399] libc: gettid() should have a wrapper
950 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
951 [16976] glob: fnmatch unbounded stack VLA for collating symbols
952 [17396] localedata: globbing for locale by [[.collating-element.]]
953 [18035] dynamic-link: pldd does no longer work, enters infinite loop
954 [18465] malloc: memusagestat is built using system C library
955 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
956 invalid input drops valid char
957 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
958 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
959 [21897] localedata: Afar locales: Fix mon, abmon, and abday
960 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
961 [23352] malloc: __malloc_check_init still defined in public header
963 [23403] nptl: Wrong alignment of TLS variables
964 [23501] libc: nftw() doesn't return dangling symlink's inode
965 [23733] malloc: Check the count before calling tcache_get()
966 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
968 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
969 [23844] nptl: pthread_rwlock_trywrlock results in hang
970 [23983] argparse: Missing compat versions of argp_failure and argp_error
971 for long double = double
972 [23984] libc: Missing compat versions of err.h and error.h functions for
974 [23996] localedata: Dutch salutations
975 [24040] libc: riscv64: unterminated call chain in __thread_start
976 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
978 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
979 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
981 [24114] regex: regexec buffer read overrun in "grep -i
982 '\(\(\)*.\)*\(\)\(\)\1'"
983 [24122] libc: Segfaults if 0 returned from la_version
984 [24153] stdio: Some input functions do not react to stdin assignment
985 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
986 RDX is set) (CVE-2019-7309)
987 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
988 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
989 not the default "nor"
990 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
991 false positives, change to modern flexible array
992 [24180] nptl: pthread_mutex_trylock does not use the correct order of
993 instructions while maintaining the robust mutex list due to missing
995 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
996 unnecessary librt dependencies
997 [24200] localedata: Revert first_weekday removal in en_IE locale
998 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
999 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1000 [24216] malloc: Check for large bin list corruption when inserting
1002 [24228] stdio: old x86 applications that use legacy libio crash on exit
1003 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1005 [24293] localedata: Missing Minguo calendar support for TW locales
1006 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1007 tt_RU (Tatar) locale
1008 [24307] localedata: Update locale data to Unicode 12.0.0
1009 [24323] dynamic-link: dlopen should not be able open PIE objects
1010 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1011 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1012 tt_RU (Tatar) locale
1013 [24370] localedata: Add lang_name for tt_RU locale
1014 [24372] locale: Binary locale files are not architecture independent
1015 [24394] time: strptime %Ey mis-parses final year of era
1016 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1018 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1020 [24531] malloc: Malloc tunables give tcache assertion failures
1021 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1023 [24535] localedata: Update locale data to Unicode 12.1.0
1024 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1025 kernels and break testing
1026 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1027 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1028 [-Werror=format-overflow=]
1029 [24570] libc: alpha: compat msgctl uses __IPC_64
1030 [24584] locale: Data race in __wcsmbs_clone_conv
1031 [24588] stdio: Remove codecvt vtables from libio
1032 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1034 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1035 [24632] stdio: Old binaries which use freopen with default stdio handles
1037 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1039 [24652] localedata: szl_PL spelling correction
1040 [24695] nss: nss_db: calling getpwent after endpwent crashes
1041 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1042 in /etc/nsswitch.conf
1043 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1044 [24740] libc: getdents64 type confusion
1045 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1046 always implemented in the same library
1047 [24744] libc: Remove copy_file_range emulation
1048 [24757] malloc: memusagestat is linked against system libpthread
1049 [24794] libc: Partial test suite run builds corrupt test-in-container
1057 * The getcpu wrapper function has been added, which returns the currently
1058 used CPU and NUMA node. This function is Linux-specific.
1060 * A new convenience target has been added for distribution maintainers
1061 to build and install all locales as directories with files. The new
1062 target is run by issuing the following command in your build tree:
1063 'make localedata/install-locale-files', with an optional DESTDIR
1064 to set the install root if you wish to install into a non-default
1065 configured location.
1067 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1069 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1070 for _GNU_SOURCE, to match BSD environments.
1072 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1073 indicates that it will abort the transaction prior to entering the kernel
1074 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1075 suspended, and this caused some undefined side-effects issues by aborting
1076 transactions manually. Glibc avoided it by abort transactions manually on
1077 each syscall, but it lead to performance issues on newer kernels where the
1078 HTM state is saved and restore lazily (the state being saved even when the
1079 process actually does not use HTM).
1081 * The functions posix_spawn_file_actions_addchdir_np and
1082 posix_spawn_file_actions_addfchdir_np have been added, enabling
1083 posix_spawn and posix_spawnp to run the new process in a different
1084 directory. These functions are GNU extensions. The function
1085 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1088 * The popen and system do not run atfork handlers anymore (BZ#17490).
1089 Although it is a possible POSIX violation, the POSIX rationale in
1090 pthread_atfork documentation regarding atfork handlers is to handle
1091 inconsistent mutex state after a fork call in a multi-threaded process.
1092 In both popen and system there is no direct access to user-defined mutexes.
1094 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1095 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1097 - C-SKY ABIV2 soft-float little-endian
1098 - C-SKY ABIV2 hard-float little-endian
1100 * strftime's default formatting of a locale's alternative year (%Ey)
1101 has been changed to zero-pad the year to a minimum of two digits,
1102 like "%y". This improves the display of Japanese era years during
1103 the first nine years of a new era, and is expected to be harmless
1104 for all other locales (only Japanese locales regularly have
1105 alternative year numbers less than 10). Zero-padding can be
1106 overridden with the '_' or '-' flags (which are GNU extensions).
1108 * As a GNU extension, the '_' and '-' flags can now be applied to
1109 "%EY" to control how the year number is formatted; they have the
1110 same effect that they would on "%Ey".
1112 Deprecated and removed features, and other changes affecting compatibility:
1114 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1115 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1117 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1118 in <sys/procfs.h>, has been corrected to match the type actually used by
1119 the Linux kernel. This affects the size and layout of that structure on
1120 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1122 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1123 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1124 defined in <sys/procfs.h>, has been corrected to match the type actually
1125 used by the Linux kernel. This affects the size and layout of those
1128 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1129 meant to scan a string and allocate space for it with malloc, is now
1130 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1131 defined. This extension conflicts with C99's use of '%a' to scan a
1132 hexadecimal floating-point number, which is now available to programs
1133 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1135 POSIX.1-2008 includes the feature of allocating a buffer for string input
1136 with malloc, using the modifier letter 'm' instead. Programs using
1137 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1138 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1139 C99 '%a' no longer need to avoid _GNU_SOURCE.
1141 GCC's -Wformat warnings can detect most uses of this extension, as long
1142 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1143 __attribute__ ((format (scanf, ...))).
1145 Changes to build and runtime requirements:
1147 * Python 3.4 or later is required to build the GNU C Library.
1149 * On most architectures, GCC 5 or later is required to build the GNU C
1150 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1152 Older GCC versions and non-GNU compilers are still supported when
1153 compiling programs that use the GNU C Library.
1155 Security related changes:
1157 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1158 denial of service due to resource exhaustion when processing getaddrinfo
1159 calls with crafted host names. Reported by Guido Vranken.
1161 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1162 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1163 happened, accessing the 32-bit size_t value as the full 64-bit register
1164 in the assembly string/memory functions would cause a buffer overflow.
1165 Reported by H.J. Lu.
1167 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1168 addresses with arbitrary trailing characters, potentially leading to data
1169 or command injection issues in applications.
1171 The following bugs are resolved with this release:
1173 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1174 [10496] localedata: 12h time representation in multiple locales faulty
1175 [10797] localedata: it_IT locale numeric does not have a separator for
1177 [11319] libc: dprintf doesn't handle errors properly
1178 [16346] time: mktime: potentially unsafe use of localtime_offset
1179 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1181 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1182 posix_spawn_file_actions_addfchdir_np
1183 [17426] localedata: Indian locales: set the correct date format
1184 [17490] stdio: popen should not invoke atfork handlers
1185 [17783] libc: TIOCSER_TEMT conditions inconsistent
1186 [18040] regex: use-after-free in regexec/get_subexp
1187 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1188 [20018] network: getaddrinfo should reject IP addresses with trailing
1189 characters (CVE-2016-10739)
1190 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1191 [20271] libc: Missing "\n" in __libc_fatal calls
1192 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1193 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1194 pointer argument is non-NULL
1195 [21037] stdio: open_memstream and freopen
1196 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1197 [21716] time: Crash in glibc's mktime in low-memory situations
1198 [22834] stdio: Subprocess forked by popen may crash in Linux when
1199 multithreads call popen
1200 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1201 and pthread_create fails.
1202 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1203 [23125] libc: riscv64: endless loop when throwing an exception from a
1205 [23275] nptl: Race in pthread_mutex_lock while promoting to
1206 PTHREAD_MUTEX_ELISION_NP.
1207 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1209 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1211 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1213 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1214 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1216 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1217 [23521] nss: get_next_alias nss_files file stream leak
1218 [23538] nptl: Hang in pthread_cond_broadcast
1219 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1220 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1221 [23579] libc: Errors misreported in preadv2
1222 [23597] build: support/test-container.c doesn't work with different
1224 [23603] time: mktime signed integer overflow on large timestamps
1225 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1226 [23614] libc: powerpc: missing CFI register information in __mpn_*
1228 [23637] string: Generic strstr/strcasestr fails with huge needles
1229 [23640] libc: no way to easily clear FD_CLOEXEC in
1230 posix_spawn_file_actions_adddup2()
1231 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1233 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1235 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1236 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1237 bits/types/struct_rusage.h
1238 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1240 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1242 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1243 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1244 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1246 [23724] localedata: Albanian date formats are incorrect
1247 [23735] math: libnldbl_nonshared.a references internal libm symbols
1248 [23740] localedata: kl_GL: Month names and date formats need update
1249 [23744] regex: regex refactorings to remove BE, avoid duplication
1250 [23745] time: mktime fix for Gnulib + coreutils
1251 [23758] time: Improve the width of alternate representation for year in
1253 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1254 [23789] time: mktime does not set errno on failure
1255 [23791] localedata: Wrong monetary format for ca_ES locale
1256 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1257 [23794] locale: c16rtomb does not handle surrogate pairs
1258 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1259 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1260 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1261 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1262 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1263 [23862] libc: [sh] missing kernel-features.h undefines
1264 [23864] libc: [riscv] missing kernel-features.h undefines
1265 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1266 [23907] malloc: Incorrect double-free malloc tcache check disregards
1268 [23913] libc: off-by-one in function maybe_script_execute in
1269 sysdeps/posix/spawni.c
1270 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1271 [23923] locale: Add --no-hard-links option to localedef
1272 [23927] network: Linux if_nametoindex() does not close descriptor
1274 [23961] math: powf can overflow to inf without setting errno in non-
1275 nearest rounding mode
1276 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1277 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1278 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1279 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1280 [24011] localedata: Fixed small type in comment for locale bs_BA
1281 [24018] libc: gettext() may return NULL
1282 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1283 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1284 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1286 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1287 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1289 [24046] localedata: en_US locale doesn't define date_fmt
1290 [24063] manual: @var{errno} should be @code{errno}
1291 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1292 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1294 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1296 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1298 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1300 [24112] network: Do not send DNS queries for non-host names (where all
1301 answers will be rejected)
1302 [24130] libc: alpha __remqu corrupts $f3 register
1309 * The localization data for ISO 14651 is updated to match the 2016
1310 Edition 4 release of the standard, this matches data provided by
1311 Unicode 9.0.0. This update introduces significant improvements to the
1312 collation of Unicode characters. This release deviates slightly from
1313 the standard in that the collation element ordering for lowercase and
1314 uppercase LATIN script characters is adjusted to ensure that regular
1315 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1316 is not matched by [a-z]. With the update many locales have been
1317 updated to take advantage of the new collation information. The new
1318 collation information has increased the size of the compiled locale
1319 archive or binary locales.
1321 * The GNU C Library can now be compiled with support for Intel CET, AKA
1322 Intel Control-flow Enforcement Technology. When the library is built
1323 with --enable-cet, the resulting glibc is protected with indirect
1324 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1325 compatible with all existing executables and shared libraries. This
1326 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1327 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1328 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1329 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1330 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1331 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1334 * The GNU C Library now has correct support for ABSOLUTE symbols
1335 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1336 relocated incorrectly or in some cases discarded. The GNU linker can
1337 make use of the newer semantics, but it must communicate it to the
1338 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1339 field) to indicate such support is required.
1341 * Unicode 11.0.0 Support: Character encoding, character type info, and
1342 transliteration tables are all updated to Unicode 11.0.0, using
1343 generator scripts contributed by Mike FABIAN (Red Hat).
1345 * <math.h> functions that round their results to a narrower type are added
1346 from TS 18661-1:2014 and TS 18661-3:2015:
1348 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1349 fMxaddfNx functions.
1351 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1352 fMxsubfNx functions.
1354 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1355 fMxmulfNx functions.
1357 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1358 fMxdivfNx functions.
1360 * Two grammatical forms of month names are now supported for the following
1361 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1362 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1363 support two grammatical forms in abbreviated month names: Catalan, Greek,
1366 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1367 include the support for two grammatical forms of month names.
1369 * Building and running on GNU/Hurd systems now works without out-of-tree
1372 * The renameat2 function has been added, a variant of the renameat function
1373 which has a flags argument. If the flags are zero, the renameat2 function
1374 acts like renameat. If the flag is not zero and there is no kernel
1375 support for renameat2, the function will fail with an errno value of
1376 EINVAL. This is different from the existing gnulib function renameatu,
1377 which performs a plain rename operation in case of a RENAME_NOREPLACE
1378 flags and a non-existing destination (and therefore has a race condition
1379 that can clobber the destination inadvertently).
1381 * The statx function has been added, a variant of the fstatat64
1382 function with an additional flags argument. If there is no direct
1383 kernel support for statx, glibc provides basic stat support based on
1384 the fstatat64 function.
1386 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1387 library if installed. libidn2 version 2.0.5 or later is recommended. If
1388 libidn2 is not available, internationalized domain names are not encoded
1389 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1390 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1391 with an encoding error.) Flags which used to change the IDN encoding and
1392 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1393 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1394 deprecated. They no longer have any effect.
1396 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1397 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1398 range of ELF gABI expressions including such constructs as
1399 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1400 have been further restricted, and where in the past a dynamic string
1401 token sequence may have been interpreted as a literal string it will
1402 now cause a load failure. These load failures were always considered
1403 unspecified behaviour from the perspective of the dynamic loader, and
1404 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1405 results in a load failure now.
1407 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1408 implementation includes all the standard functions provided by
1411 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1412 thrd_detach, thrd_exit, and thrd_join for thread management.
1414 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1415 mtx_destroy for mutual exclusion.
1417 - call_once for function call synchronization.
1419 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1420 cnd_wait for conditional variables.
1422 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1424 Application developers must link against libpthread to use ISO C threads.
1426 Deprecated and removed features, and other changes affecting compatibility:
1428 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1429 installed. Software that was using either header should be updated to
1430 use standard <stdio.h> interfaces instead.
1432 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1433 This was never required by the C standard, and the macros just expanded
1434 to call alternative names for the same functions. If you hoped getc and
1435 putc would provide performance improvements over fgetc and fputc, instead
1436 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1437 necessary, flockfile and funlockfile.
1439 * All stdio functions now treat end-of-file as a sticky condition. If you
1440 read from a file until EOF, and then the file is enlarged by another
1441 process, you must call clearerr or another function with the same effect
1442 (e.g. fseek, rewind) before you can read the additional data. This
1443 corrects a longstanding C99 conformance bug. It is most likely to affect
1444 programs that use stdio to read interactive input from a terminal.
1447 * The macros 'major', 'minor', and 'makedev' are now only available from
1448 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1449 headers that happen to include <sys/types.h>. These macros are rarely
1450 used, not part of POSIX nor XSI, and their names frequently collide with
1451 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1452 further explanation.
1454 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1455 these macros should first include <sys/types.h>, and then include
1456 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1458 * The tilegx*-*-linux-gnu configurations are no longer supported.
1460 * The obsolete function ustat is no longer available to newly linked
1461 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1462 function has been deprecated in favor of fstatfs and statfs.
1464 * The obsolete function nfsservctl is no longer available to newly linked
1465 binaries. This function was specific to systems using the Linux kernel
1466 and could not usefully be used with the GNU C Library on systems with
1467 version 3.1 or later of the Linux kernel.
1469 * The obsolete function name llseek is no longer available to newly linked
1470 binaries. This function was specific to systems using the Linux kernel
1471 and was not declared in a header. Programs should use the lseek64 name
1472 for this function instead.
1474 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1475 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1476 previously selected by them is now always enabled.
1478 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1479 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1480 restriction (rejecting '_' in host names, among other things) has been
1481 removed, for increased compatibility with non-IDN name resolution.
1483 * The fcntl function now have a Long File Support variant named fcntl64. It
1484 is added to fix some Linux Open File Description (OFD) locks usage on non
1485 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1486 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1487 locks act as a cancellation entrypoint.
1489 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1490 ecb_crypt, and des_setparity are no longer available to newly linked
1491 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1492 longer installed. These functions encrypted and decrypted data with the
1493 DES block cipher, which is no longer considered secure. Software that
1494 still uses these functions should switch to a modern cryptography library,
1497 * Reflecting the removal of the encrypt and setkey functions above, the
1498 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1499 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1502 * The obsolete function fcrypt is no longer available to newly linked
1503 binaries. It was just another name for the standard function crypt,
1504 and it has not appeared in any header file in many years.
1506 * We have tentative plans to hand off maintenance of the passphrase-hashing
1507 library, libcrypt, to a separate development project that will, we hope,
1508 keep up better with new passphrase-hashing algorithms. We will continue
1509 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1510 'crypt_r' should not need to change at all; however, distributions will
1511 need to install <crypt.h> and libcrypt from a separate project.
1513 In this release, if the configure option --disable-crypt is used, glibc
1514 will not install <crypt.h> or libcrypt, making room for the separate
1515 project's versions of these files. The plan is to make this the default
1516 behavior in a future release.
1518 Changes to build and runtime requirements:
1520 GNU make 4.0 or later is now required to build glibc.
1522 Security related changes:
1524 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1525 been fixed by removing the glibc-internal IDNA implementation and using
1526 the system-provided libidn2 library instead. Originally reported by Hanno
1527 Böck and Christian Weisgerber.
1529 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1530 architecture could corrupt memory. Reported by Max Horn.
1532 CVE-2018-11236: Very long pathname arguments to realpath function could
1533 result in an integer overflow and buffer overflow. Reported by Alexey
1536 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1537 architecture could write beyond the target buffer, resulting in a buffer
1538 overflow. Reported by Andreas Schwab.
1540 The following bugs are resolved with this release:
1542 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1543 [6889] manual: 'PWD' mentioned but not specified
1544 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1545 when __WORDSIZE != 64
1546 [13762] regex: re_search etc. should return -2 on memory exhaustion
1547 [13888] build: /tmp usage during testing
1548 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1549 [14092] nptl: Support C11 threads
1550 [14095] localedata: Review / update collation data from Unicode / ISO
1552 [14508] libc: -Wformat warnings
1553 [14553] libc: Namespace pollution loff_t in sys/types.h
1554 [14890] libc: Make NT_PRFPREG canonical.
1555 [15105] libc: Extra PLT references with -Os
1556 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1558 [16335] manual: Feature test macro documentation incomplete and out of
1560 [16552] libc: Unify umount implementations in terms of umount2
1561 [17082] libc: htons et al.: statement-expressions prevent use on global
1562 scope with -O1 and higher
1563 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1564 [17438] localedata: pt_BR: wrong d_fmt delimiter
1565 [17662] libc: please implement binding for the new renameat2 syscall
1566 [17721] libc: __restrict defined as /* Ignore */ even in c11
1567 [17979] libc: inconsistency between uchar.h and stdint.h
1568 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1569 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1570 horrible machine code)
1571 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1573 [18471] libc: llseek should be a compat symbol
1574 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1576 [18991] nss: nss_files skips large entry in database
1577 [19239] libc: Including stdlib.h ends up with macros major and minor being
1579 [19463] libc: linknamespace failures when compiled with -Os
1580 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1581 [19527] locale: Normalized charset name not recognized by setlocale
1582 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1583 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1585 [19728] network: out of bounds stack read in libidn function
1586 idna_to_ascii_4i (CVE-2016-6261)
1587 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1588 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1589 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1591 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1592 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1593 [20419] dynamic-link: files with large allocated notes crash in
1595 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1596 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1597 [20980] manual: CFLAGS environment variable replaces vital options
1598 [21163] regex: Assertion failure in pop_fail_stack when executing a
1599 malformed regexp (CVE-2015-8985)
1600 [21234] manual: use of CFLAGS makes glibc detect no optimization
1601 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1602 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1603 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1604 [21508] locale: intl/tst-gettext failure with latest msgfmt
1605 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1606 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1607 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1609 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1611 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1612 [22247] network: Integer overflow in the decode_digit function in
1613 puny_decode.c in libidn (CVE-2017-14062)
1614 [22342] nscd: NSCD not properly caching netgroup
1615 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1616 [22550] localedata: es_ES locale (and other es_* locales): collation
1617 should treat ñ as a primary different character, sync the collation
1618 for Spanish with CLDR
1619 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1620 by gcc configured with --enable-default-pie
1621 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1622 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1623 crossing 2GB threshold (CVE-2017-18269)
1624 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1626 [22735] time: Misleading typo in time.h source comment regarding
1628 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1629 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1630 `__assert_perror_fail ()' to `__assert_fail_base ()'
1631 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1633 [22786] libc: Stack buffer overflow in realpath() if input size is close
1634 to SSIZE_MAX (CVE-2018-11236)
1635 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1636 through an absolute DT_NEEDED path
1637 [22792] build: tcb-offsets.h dependency dropped
1638 [22797] libc: pkey_get() uses non-reserved name of argument
1639 [22807] libc: PTRACE_* constants missing for powerpc
1640 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1641 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1642 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1643 [22848] localedata: ca_ES: update date definitions from CLDR
1644 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1645 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1646 [22896] localedata: Update locale data for an_ES
1647 [22902] math: float128 test failures with GCC 8
1648 [22918] libc: multiple common of `__nss_shadow_database'
1649 [22919] libc: sparc32: backtrace yields infinite backtrace with
1651 [22926] libc: FTBFS on powerpcspe
1652 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1654 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1655 [22947] libc: FAIL: misc/tst-preadvwritev2
1656 [22963] localedata: cs_CZ: Add alternative month names
1657 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1658 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1659 [22998] dynamic-link: execstack tests are disabled when SELinux is
1661 [23005] network: Crash in __res_context_send after memory allocation
1663 [23007] math: strtod cannot handle -nan
1664 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1665 [23036] regex: regex equivalence class regression
1666 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1667 [23069] libc: sigaction broken on riscv64-linux-gnu
1668 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1669 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1670 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1671 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1672 and libc build with -Os)
1673 [23140] localedata: More languages need two forms of month names
1674 [23145] libc: _init/_fini aren't marked as hidden
1675 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1676 [23171] math: C++ iseqsig for long double converts arguments to double
1677 [23178] nscd: sudo will fail when it is run in concurrent with commands
1678 that changes /etc/passwd
1679 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1681 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1682 [23208] localedata: New locale - Lower Sorbian (dsb)
1683 [23233] regex: Memory leak in build_charclass_op function in file
1685 [23236] stdio: Harden function pointers in _IO_str_fields
1686 [23250] nptl: Offset of __private_ss differs from GCC
1687 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1688 -mtune=generic -mfpmath=sse
1689 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1691 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1692 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1694 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1695 [23277] math: nan function should not have const attribute
1696 [23279] math: scanf and strtod wrong for some hex floating-point
1697 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1699 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1700 [23303] build: undefined reference to symbol
1701 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1702 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1704 [23313] stdio: libio vtables validation and standard file object
1706 [23329] libc: The __libc_freeres infrastructure is not properly run across
1708 [23349] libc: Various glibc headers no longer compatible with
1710 [23351] malloc: Remove unused code related to heap dumps and malloc
1712 [23363] stdio: stdio-common/tst-printf.c has non-free license
1713 [23396] regex: Regex equivalence regression in single-byte locales
1714 [23422] localedata: oc_FR: More updates of locale data
1715 [23442] build: New warning with GCC 8
1716 [23448] libc: Out of bounds access in IBM-1390 converter
1717 [23456] libc: Wrong index_cpu_LZCNT
1718 [23458] build: tst-get-cpu-features-static isn't added to tests
1719 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1721 [23467] dynamic-link: x86/CET: A property note parser bug
1728 * The GNU C Library can now be compiled with support for building static
1729 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1730 executables are like static executables but can be loaded at any address
1731 and provide additional security hardening benefits at the cost of some
1732 memory and performance. When the library is built with --enable-static-pie
1733 the resulting libc.a is usable with GCC 8 and above to create static PIE
1734 executables using the GCC option '-static-pie'. This feature is currently
1735 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1736 aarch64 with binutils 2.30 or later.
1738 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1739 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1742 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1744 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1746 * In order to support faster and safer process termination the malloc API
1747 family of functions will no longer print a failure address and stack
1748 backtrace after detecting heap corruption. The goal is to minimize the
1749 amount of work done after corruption is detected and to avoid potential
1750 security issues in continued process execution. Reducing shutdown time
1751 leads to lower overall process restart latency, so there is benefit both
1752 from a security and performance perspective.
1754 * The abort function terminates the process immediately, without flushing
1755 stdio streams. Previous glibc versions used to flush streams, resulting
1756 in deadlocks and further data corruption. This change also affects
1757 process aborts as the result of assertion failures.
1759 * On platforms where long double has the IEEE binary128 format (aarch64,
1760 alpha, mips64, riscv, s390 and sparc), the math library now implements
1761 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1762 These are the same interfaces added in version 2.26 for some platforms where
1763 this format is supported but is not the format of long double.
1765 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1766 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1767 implements interfaces for that type, as defined by ISO/IEC TS
1768 18661-3:2015. These are corresponding interfaces to those supported for
1771 * The math library now implements interfaces for the _Float32, _Float64 and
1772 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1773 corresponding interfaces to those supported for _Float128.
1775 * glibc now implements the memfd_create and mlock2 functions on Linux.
1777 * Support for memory protection keys was added. The <sys/mman.h> header now
1778 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1781 * The copy_file_range function was added.
1783 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1785 * The ldconfig utility now processes `include' directives using the C/POSIX
1786 collation ordering. Previous glibc versions used locale-specific
1787 ordering, the change might break systems that relied on that.
1789 * Support for two grammatical forms of month names has been added.
1790 In a call to strftime, the "%B" and "%b" format specifiers will now
1791 produce the grammatical form required when the month is used as part
1792 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1793 required when the month is named by itself. For instance, in Greek
1794 and in many Slavic and Baltic languages, "%B" will produce the month
1795 in genitive case, and "%OB" will produce the month in nominative case.
1797 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1798 are all valid and will all accept any known form of month
1799 name---standalone or complete, abbreviated or full. In a call to
1800 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1801 the strings used by "%B" and "%b", respectively. New query
1802 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1803 used by "%OB" and "%Ob", respectively.
1805 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1806 define the strings for %OB and %Ob, respectively; these have the
1807 same syntax as "mon" and "abmon". These arrays are optional; if they
1808 are not provided then they have the same content as "mon" and "abmon",
1811 These features are provided for locales which define "alt_mon" and/or
1812 "ab_alt_mon" in their locale source data. This release includes such
1813 alternative month name data for the following languages: Belarusian,
1814 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1816 This feature is currently a GNU extension, but it is expected to
1817 be added to the next revision of POSIX, and it is also already
1818 available on some BSD-derived operating systems.
1820 This feature will cause existing statically compiled applications
1821 to fail to load locales and fall back to the builtin C/POSIX locales.
1822 See notes below for other changes affecting compatibility.
1824 * Support for the RISC-V ISA running on Linux has been added. This port
1825 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1826 for the following ISA and ABI pairs:
1832 Deprecated and removed features, and other changes affecting compatibility:
1834 * Statically compiled applications attempting to load locales compiled for the
1835 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1836 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1837 support for two grammatical forms of the month names, also extends the locale
1838 data binary format. Static applications needing locale support must be
1839 recompiled to match the runtime and data they are deployed with. In some
1840 distributions there is an upgrade window where dynamically linked applications
1841 may use a new library but the old locale data and also fall back to the
1842 builtin C/POSIX locales; restarting the application process is sufficient to
1845 * Support for statically linked applications which call dlopen is deprecated
1846 and will be removed in a future version of glibc. Applications which call
1847 dlopen need to be linked dynamically instead.
1849 * Support for old programs which use internal stdio data structures and
1850 functions is deprecated. This includes programs which use the C++ streams
1851 provided by libstdc++ in GCC 2.95. Programs which use the internal
1852 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1853 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1854 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1855 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1856 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1857 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1858 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1859 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1860 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1861 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1862 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1863 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1864 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1865 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1866 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1867 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1868 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1869 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1870 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1871 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1872 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1873 future version of glibc. Unlike other symbol removals, these old
1874 applications will not be supported using compatibility symbols.
1876 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1877 defined by <sys/ptrace.h>.
1879 * libm no longer supports SVID error handling (calling a user-provided
1880 matherr function on error) or the _LIB_VERSION variable to control error
1881 handling. (SVID error handling and the _LIB_VERSION variable still work
1882 for binaries linked against older versions of the GNU C Library.) The
1883 libieee.a library is no longer provided. math.h no longer defines struct
1884 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1885 TLOSS, PLOSS and HUGE.
1887 * The libm functions pow10, pow10f and pow10l are no longer supported for
1888 new programs. Programs should use the standard names exp10, exp10f and
1889 exp10l for these functions instead.
1891 * The mcontext_t type is no longer the same as struct sigcontext. On
1892 platforms where it was previously the same, this changes the C++ name
1893 mangling for interfaces involving this type.
1895 * The add-ons mechanism for building additional packages at the same time as
1896 glibc has been removed. The --enable-add-ons configure option is now
1899 * The --without-fp configure option is now ignored. Whether hardware
1900 floating-point instructions are used is now configured based on whether
1901 the compiler used at configure time (without any options implied by a
1902 --with-cpu= configure option) uses such instructions.
1904 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1905 the specified string can be parsed as a domain name.
1907 * In the malloc_info output, the <heap> element may contain another <aspace>
1908 element, "subheaps", which contains the number of sub-heaps.
1910 * The libresolv function p_secstodate is no longer supported for new
1913 * The tilepro-*-linux-gnu configuration is no longer supported.
1915 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1916 and will be removed in a future release. Software that is still using
1917 either header should be updated to use standard <stdio.h> interfaces
1920 libio.h was originally the header for a set of supported GNU extensions,
1921 but they have not been maintained as such in many years, they are now
1922 standing in the way of improvements to stdio, and we don't think there are
1923 any remaining external users. _G_config.h was never intended for public
1924 use, but predates the bits convention.
1926 Changes to build and runtime requirements:
1928 * bison version 2.7 or later is required to generate code in the 'intl'
1931 Security related changes:
1933 CVE-2009-5064: The ldd script would sometimes run the program under
1934 examination directly, without preventing code execution through the
1935 dynamic linker. (The glibc project disputes that this is a security
1936 vulnerability; only trusted binaries must be examined using the ldd
1939 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1940 suffered from a one-byte overflow during ~ operator processing (either
1941 on the stack or the heap, depending on the length of the user name).
1942 Reported by Tim Rühsen.
1944 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1945 would sometimes fail to free memory allocated during ~ operator
1946 processing, leading to a memory leak and, potentially, to a denial
1949 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1950 without GLOB_NOESCAPE, could write past the end of a buffer while
1951 unescaping user names. Reported by Tim Rühsen.
1953 CVE-2017-17426: The malloc function, when called with an object size near
1954 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1955 instead of NULL. This was a regression introduced with the new malloc
1956 thread cache in glibc 2.26. Reported by Iain Buclaw.
1958 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1959 to the allocation of too much memory. (This is not a security bug per se,
1960 it is mentioned here only because of the CVE assignment.) Reported by
1963 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1964 of the number of search path components. (This is not a security
1965 vulnerability per se because no trust boundary is crossed if the fix for
1966 CVE-2017-1000366 has been applied, but it is mentioned here only because
1967 of the CVE assignment.) Reported by Qualys.
1969 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1970 for AT_SECURE or SUID binaries could be used to load libraries from the
1973 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1974 succeeds without returning an absolute path due to unexpected behaviour
1975 of the Linux kernel getcwd syscall. Reported by halfdog.
1977 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1978 an object size near the value of SIZE_MAX, would return a pointer to a
1979 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1981 CVE-2018-6551: The malloc function, when called with an object size near
1982 the value of SIZE_MAX, would return a pointer to a buffer which is too
1983 small, instead of NULL.
1985 The following bugs are resolved with this release:
1987 [866] glob: glob should match dangling symlinks
1988 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1989 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1991 [5997] math: Very slow execution of sinf function
1992 [10580] localedata: hr_HR: updated locale
1993 [10871] locale: 'mon' array should contain both nominative and genitive
1995 [12349] localedata: eu_ES: incorrect thousands separator
1996 [13605] localedata: shn_MM: new Shan locale
1997 [13805] localedata: ru_RU: currency should use ',' as radix point
1998 [13953] localedata: km_KH: locale update
1999 [13994] localedata: mjw_IN: new locale
2000 [14121] build: make writes .mo files in po directory
2001 [14333] libc: Fix the race between atexit() and exit()
2002 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2003 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2005 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2006 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2007 width Latin characters
2008 [15332] localedata: es_CU: locale update
2009 [15436] stdio: Don't close or flush stdio streams on abort
2010 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2012 [16148] localedata: ca_ES: incorrect thousands separator
2013 [16750] dynamic-link: ldd should not try to execute the binaries
2015 [16777] localedata: pl_PL: incorrect thousands separator in locale
2016 [16905] localedata: hanzi: new collation
2017 [17563] localedata: cmn_TW: add hanzi collation
2018 [17750] localedata: wrong collation order of diacritics in most locales
2019 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2021 [17956] build: Build fails on missing definitions from header file
2022 nss/nss.h when Mozilla NSS is used for cryptography
2023 [18203] libc: realpath() does not handle unreachable paths correctly
2024 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2025 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2026 [18822] libc: Internal functions are called via PLT
2027 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2028 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2029 [19574] libc: glibc should support building static PIE binaries
2030 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2032 [19971] glob: glob: Do not skip entries with zero d_ino values
2033 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2034 [20008] localedata: km_KH: convert to translit_neutral
2035 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2036 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2037 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2038 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2039 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2041 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2042 they're set, wrong errors returned by gaih_inet when lookup functions
2044 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2045 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2047 [20952] localedata: yuw_PG: new locale
2048 [21084] localedata: charmaps/IBM858: new codepage
2049 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2050 [21242] libc: assert gives pedantic warning in old gcc versions
2051 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2052 __regcall calling convention
2053 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2054 [21326] libc: C99 functions are not declared for C++11 and later if
2055 _GNU_SOURCE is not predefined by g++
2056 [21457] libc: sys/ucontext.h namespace
2057 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2058 [21660] math: GCC fails to compile a formula with tgmath.h
2059 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2060 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2061 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2062 [21684] math: tgmath.h handling of complex integers
2063 [21685] math: tgmath.h handling of bit-fields
2064 [21686] math: tgmath.h handling of __int128
2065 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2067 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2069 [21750] localedata: column width of characters incompatible with classical
2071 [21754] malloc: malloc: Perform as little work as possible after heap
2072 consistency check failures
2073 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2074 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2075 [21791] string: Unused XXX_chk_XXX functions in libc.a
2076 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2078 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2080 [21845] localedata: Added new Locale bho_NP
2081 [21853] localedata: Fix abday Which looks same as day in zh_SG
2082 [21854] localedata: Added New Locale en_SC
2083 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2084 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2085 _dl_runtime_resolve_avx_slow
2086 [21885] network: getaddrinfo: gethosts does not release resolver context
2087 on memory allocation failure
2088 [21899] libc: XPG4.2 sigaction namespace
2089 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2091 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2093 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2094 errno value, causing getaddrinfo to fail
2095 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2096 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2097 instead of EAI_NODATA
2098 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2099 constant PTRACE_SEIZE_DEVEL
2100 [21930] math: C-only gcc builtins used in <math.h> isinf
2101 [21932] network: Unpaired __resolv_context_get in generic get*_r
2103 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2104 [21944] libc: sigval namespace
2105 [21951] localedata: Update hanzi collation by stroke
2106 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2107 sysdeps/x86_64/fpu/e_expf.S
2108 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2109 allocation in syscall loops)
2110 [21959] localedata: Fix Country name for xh_ZA
2111 [21960] localedata: Fix abmon for bem_ZM
2112 [21966] math: AVX2 mathvec functions use FMA without checking
2113 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2114 [21971] localedata: Added New Locale for mfe_MU
2115 [21972] libc: assert macro requires operator== (int) for its argument type
2116 [21973] math: [sparc] libm missing sqrtl compat symbol
2117 [21974] libc: Remove __bb_init_func and __bb_exit_func
2118 [21982] string: stratcliff.c: error: assuming signed overflow does not
2120 [21986] stdio: __guess_grouping is called incorrectly
2121 [21987] math: [sparc32] wrong bits/long-double.h installed
2122 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2124 [22022] localedata: Missing country_name for mni_IN
2125 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2127 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2129 [22026] locale: iconv_open: heap overflow on gconv_init failure
2130 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2131 [22035] math: [m68k] bits/math-inline.h macro namespace
2132 [22038] localedata: Fix abbreviated weeks and months for Somali
2133 [22044] localedata: Remove redundant data for Limburgish Language
2134 [22050] malloc: Linking with -lmcheck does not hook
2135 __malloc_initialize_hook correctly
2136 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2137 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2138 [22070] localedata: charmaps/UTF-8: wcwidth for
2139 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2140 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2141 Jungseong and Jongseong) should be 0
2142 [22078] nss: nss_files performance issue in multi mode
2143 [22082] math: bits/math-finite.h exp10 condition
2144 [22086] libc: pcprofiledump incorrect cross-endian condition
2145 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2146 [22095] network: Name server address allocation memory leak in resolv.conf
2148 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2150 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2151 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2153 [22111] malloc: malloc: per thread cache is not returned when thread exits
2154 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2155 [22134] libc: [linux] implement fexecve with execveat
2156 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2158 [22145] libc: ttyname() gives up too early in the face of namespaces
2159 [22146] math: C++ build issue with float128 on x86_64
2160 [22153] nptl: nptl: save error code before process termination
2161 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2162 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2163 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2164 [22165] libc: [hppa] Text relocations in libc.so
2165 [22180] libc: destructor registered via __cxa_atexit is called twice
2166 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2167 symlinks") cause "make" segfaults
2168 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2170 [22207] libc: FAIL: stdlib/test-atexit-race
2171 [22225] math: nearbyint arithmetic moved before feholdexcept
2172 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2173 [22235] math: iscanonical in C++ and float128
2174 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2175 the svid compat wrapper
2176 [22244] math: ynf and yn are wrong without the svid compat wrapper
2177 [22273] libc: Improper assert in Linux posix_spawn implementation
2178 [22284] libc: -pg -pie doesn't work
2179 [22292] locale: localedef exits with error 4 when it should be error 1
2180 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2181 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2183 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2184 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2186 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2187 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2188 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2189 [22322] libc: [mips64] wrong bits/long-double.h installed
2190 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2191 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2193 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2194 [22343] malloc: Integer overflow in posix_memalign
2195 [22347] libc: getrandom() returns the number of bytes that were copied to
2196 the buffer even though the comments say "Return 0 on success and -1 on
2198 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2199 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2201 [22370] dynamic-link: Incorrect note padding check
2202 [22375] libc: malloc returns pointer from tcache_get when should return
2203 NULL (CVE-2017-17426)
2204 [22377] math: iseqsig, float128 and C++
2205 [22382] localedata: Error in tpi_PG locale
2206 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2207 inside the ASCII printable range
2208 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2210 [22403] localedata: Slash needs escaping in some locales
2211 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2212 [22409] network: res_hnok does not accept some host names used on the
2214 [22412] network: res_dnok, res_hnok should perform syntax checks
2215 [22413] network: ns_name_pton ignores syntactically invalid trailing
2217 [22415] stdio: setvbuf can lead to invalid free/segfault
2218 [22432] build: Non-deterministic build
2219 [22439] malloc: malloc_info should compute summary statistics for all sub-
2221 [22442] network: if_nametoindex could report index for the wrong
2222 networking interface
2223 [22446] build: aliasing violation calling readlink in handle_request
2224 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2225 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2226 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2227 __nscd_hash/__nss_hash
2228 [22463] network: p_secstodate overflow handling
2229 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2230 [22478] libc: sigwait can fail with EINTR
2231 [22505] libc: ldconfig processes include directive in locale-specific
2233 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2234 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2235 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2236 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2237 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2238 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2239 same as for Croatian
2240 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2241 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2242 [22577] libc: missing newline after "cannot allocate TLS data structures
2244 [22588] manual: manual/conf.texi: missing underscore in front of
2246 [22593] math: nextafter and nexttoward are declared with const attribute
2247 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2248 [22603] string: ia64 memchr overflows internal pointer check
2249 [22605] libc: SH clone does not set the exit code correctly
2250 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2252 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2253 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2254 modified in case of success
2255 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2256 [22615] manual: manual: ambiguous wording about errno value in case of
2258 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2260 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2261 binaries or if /proc is not mounted (CVE-2017-16997)
2262 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2263 [22630] build: $(no-pie-ldflag) is no longer effective
2264 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2265 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2266 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2267 [22637] nptl: guard size is subtracted from thread stack size instead of
2269 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2270 [22657] localedata: hu_HU: Avoid double space in date
2271 [22660] math: fmax, fmin sNaN handling on alpha
2272 [22664] libc: New warning of GCC8
2273 [22665] math: alpha: ceil and floor raise inexact exceptions
2274 [22666] math: alpha: trunc raise inexact exceptions
2275 [22667] libc: makecontext lacks stack alignment on i386
2276 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2277 [22679] libc: getcwd(3) can succeed without returning an absolute path
2279 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2280 elision and tunables
2281 [22687] math: [powerpc-nofpu] complex long double functions spurious
2283 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2284 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2285 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2287 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2288 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2290 [22701] nis: Incomplete removal of libnsl
2291 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2292 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2293 [22715] dynamic-link: FAIL: elf/tst-audit10
2294 [22719] libc: Backtrace tests fail on hppa
2295 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2296 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2297 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2298 before the first call to crypt_r () in crypt/badsalttest.c
2305 * A per-thread cache has been added to malloc. Access to the cache requires
2306 no locks and therefore significantly accelerates the fast path to allocate
2307 and free small amounts of memory. Refilling an empty cache requires locking
2308 the underlying arena. Performance measurements show significant gains in a
2309 wide variety of user workloads. Workloads were captured using a special
2310 instrumented malloc and analyzed with a malloc simulator. Contributed by
2311 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2313 * Unicode 10.0.0 Support: Character encoding, character type info, and
2314 transliteration tables are all updated to Unicode 10.0.0, using
2315 generator scripts contributed by Mike FABIAN (Red Hat).
2316 These updates cause user visible changes, especially the changes in
2317 wcwidth for many emoji characters cause problems when emoji sequences
2318 are rendered with pango, see for example:
2319 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2321 * Collation of Hungarian has been overhauled and is now consistent with "The
2322 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2325 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2327 - The GNU C Library will now detect when /etc/resolv.conf has been
2328 modified and reload the changed configuration. The new resolver option
2329 “no-reload” (RES_NORELOAD) disables this behavior.
2331 - The GNU C Library now supports an arbitrary number of search domains
2332 (configured using the “search” directive in /etc/resolv.conf);
2333 previously, there was a hard limit of six domains. For backward
2334 compatibility, applications that directly modify the ‘_res’ global
2335 object are still limited to six search domains.
2337 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2338 Library will now randomly pick a name server from the configuration as a
2339 starting point. (Previously, the second name server was always used.)
2341 * The tunables feature is now enabled by default. This allows users to tweak
2342 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2344 * New function reallocarray, which resizes an allocated block (like realloc)
2345 to the product of two sizes, with a guaranteed clean failure upon integer
2346 overflow in the multiplication. Originally from OpenBSD, contributed by
2347 Dennis Wölfing and Rüdiger Sonderfeld.
2349 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2350 These are extended versions of preadv and pwritev, respectively, taking an
2351 additional flags argument. The set of supported flags depends on the
2352 running kernel; full support currently requires kernel 4.7 or later.
2354 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2355 create a new session ID for the spawned process. This feature is
2356 scheduled to be added to the next major revision of POSIX; for the time
2357 being, it is available under _GNU_SOURCE.
2359 * errno.h is now safe to use from C-preprocessed assembly language on all
2360 supported operating systems. In this context, it will only define the
2361 Exxxx constants, as preprocessor macros expanding to integer literals.
2363 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2364 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2365 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2366 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2368 To compile programs that use this feature, the compiler must support
2369 128-bit floating point with the type name _Float128 (as defined by TS
2370 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2371 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2372 must be defined to make the new interfaces visible.
2374 The new functions and macros correspond to those present for other
2375 floating-point types (except for a few obsolescent interfaces not
2376 supported for the new type), with F128 or f128 suffixes; for example,
2377 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2378 printf or scanf formats for the new type; the strfromf128 and strtof128
2379 interfaces should be used instead.
2381 Deprecated and removed features, and other changes affecting compatibility:
2383 * The synchronization that pthread_spin_unlock performs has been changed to
2384 now be equivalent to a C11 atomic store with release memory order to the
2385 spin lock's memory location. Previously, several (but not all)
2386 architectures used stronger synchronization (e.g., containing what is
2387 often called a full barrier). This change can improve performance, but
2388 may affect odd fringe uses of spin locks that depend on the previous
2389 behavior (e.g., using spin locks as atomic variables to try to implement
2390 Dekker's mutual exclusion algorithm).
2392 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2395 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2396 will only be built and installed when the GNU C Library is configured with
2397 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2398 as TIRPC or rpcsvc-proto, to be used.
2400 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2401 libnss_compat, are deprecated, and will not be built or installed by
2404 The NIS(+) support library, libnsl, is also deprecated. By default, a
2405 compatibility shared library will be built and installed, but not headers
2406 or development libraries. Only a few NIS-related programs require this
2407 library. (In particular, the GNU C Library has never required programs
2408 that use 'gethostbyname' to be linked with libnsl.)
2410 Replacement implementations based on TIRPC, which additionally support
2411 IPv6, are available from <https://github.com/thkukuk/>. The configure
2412 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2413 name service modules, to be built and installed.
2415 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2416 support is enabled, the configured recursive resolver must support EDNS.
2417 (Responding to EDNS-enabled queries with responses which are not
2418 EDNS-enabled is fine, but FORMERR responses are not.)
2420 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2421 servers have not supported this opcode for a long time.
2423 * The _res_opcodes variable has been removed from libresolv. It had been
2424 exported by accident.
2426 * <string.h> no longer includes inline versions of any string functions,
2427 as this kind of optimization is better done by the compiler. The macros
2428 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2430 * The nonstandard header <xlocale.h> has been removed. Most programs should
2431 use <locale.h> instead. If you have a specific need for the definition of
2432 locale_t with no other declarations, please contact
2433 libc-alpha@sourceware.org and explain.
2435 * The obsolete header <sys/ultrasound.h> has been removed.
2437 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2439 * The obsolete function cfree has been removed. Applications should use
2442 * The stack_t type no longer has the name struct sigaltstack. This changes
2443 the C++ name mangling for interfaces involving this type.
2445 * The ucontext_t type no longer has the name struct ucontext. This changes
2446 the C++ name mangling for interfaces involving this type.
2448 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2449 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2450 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2451 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2452 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2453 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2454 fpregset_t type no longer has the name struct fpu. This changes the C++
2455 name mangling for interfaces involving those types.
2457 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2458 synced with the kernel:
2460 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2461 are not supported on this architecture and have been removed.
2463 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2464 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2465 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2467 Programs that assume the GET/SETREGS ptrace requests are universally
2468 available will now fail to build, instead of malfunctioning at runtime.
2470 Changes to build and runtime requirements:
2472 * Linux kernel 3.2 or later is required at runtime, on all architectures
2473 supported by that kernel. (This is a change from version 2.25 only for
2476 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2478 * On most architectures, GCC 4.9 or later is required to build the GNU C
2479 Library. On powerpc64le, GCC 6.2 or later is required.
2481 Older GCC versions and non-GNU compilers are still supported when
2482 compiling programs that use the GNU C Library. (We do not know exactly
2483 how old, and some GNU extensions to C may be _de facto_ required. If you
2484 are interested in helping us make this statement less vague, please
2485 contact libc-alpha@sourceware.org.)
2487 Security related changes:
2489 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2490 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2492 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2493 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2495 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2496 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2499 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2500 fixed (CVE-2017-12133).
2502 The following bugs are resolved with this release:
2504 [984] network: Respond to changed resolv.conf in gethostbyname
2505 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2506 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2508 [12189] libc: __stack_chk_fail should not attempt a backtrace
2510 [14096] time: Race condition on timezone/tst-timezone.out
2511 [14172] localedata: az_IR: new locale
2512 [14995] build: glibc fails to build if gold is the default linker, even if
2514 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2515 [16637] network: inet_pton function is accepting IPv6 with bad format
2516 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2517 x86 and other generic code
2518 [16875] localedata: ko_KR: fix lang_name
2519 [17225] localedata: ar_SY: localized month names for May and June are
2521 [17297] localedata: da_DK: wrong date_fmt string
2522 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2523 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2524 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2525 [19066] localedata: ar_SA abbreviated day and month names are in English
2526 [19569] network: resolv: Support an arbitrary number of search domains
2527 [19570] network: Implement random DNS server selection in the stub
2529 [19838] locale: localedef fails on PA-RISC
2530 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2531 order of 0D36 and 0D37
2532 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2534 [20098] libc: FAIL: debug/backtrace-tst on hppa
2535 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2537 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2539 [20313] localedata: Update locale data to Unicode 9.0
2540 [20424] manual: Document how to provide a malloc replacement
2541 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2543 [20686] locale: Add el_GR@euro to SUPPORTED.
2544 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2545 failures consistently
2546 [21015] dynamic-link: Document and fix --enable-bind-now
2547 [21016] nptl: pthread_cond support is broken on hppa
2548 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2549 frame-pointer on i386
2550 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2552 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2553 [21088] libc: Build fails with --enable-static-nss
2554 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2555 generic c code is used
2556 [21109] libc: Tunables broken on big-endian
2557 [21112] math: powf has large ulp errors with base close to 1 and exponent
2559 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2561 [21120] malloc: glibc malloc is incompatible with GCC 7
2562 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2564 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2565 (-0.0) when linking with -lieee
2566 [21171] math: log10, log2 and lgamma return incorrect results
2567 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2568 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2569 [21207] localedata: ce_RU: update weekdays from CLDR
2570 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2571 [21217] localedata: Update months from CLDR-31
2572 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2573 [21243] libc: support_delete_temp_file should issue warning for failed
2575 [21244] libc: support resolv_test_start() socket fd close should be
2577 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2578 new posix_spawn implementation
2579 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2580 leads to lower CPU frequency
2581 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2582 [21261] libc: [sparc64] bits/setjmp.h namespace
2583 [21267] network: [mips] bits/socket.h IOC* namespace
2584 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2585 [21270] libc: mmap64 silently truncates large offset values
2586 [21275] libc: posix_spawn always crashes on ia64 now
2587 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2588 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2589 [21289] libc: Incorrect declaration for 32-bit platforms with
2590 _FILE_OFFSET_BITS=64 causes build error
2591 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2592 not support gethostbyname4_r
2593 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2595 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2597 [21340] libc: Support POSIX_SPAWN_SETSID
2598 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2599 [21359] network: ns_name_pack needs additional byte in destination buffer
2600 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2601 against fragmentation attacks (CVE-2017-12132)
2602 [21369] network: resolv: Remove EDNS fallback
2603 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2605 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2606 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2607 [21393] stdio: Missing dup3 error check in freopen, freopen64
2608 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2609 [21399] localedata: Bad description for U00EC in
2610 localedata/charmaps/CP1254
2611 [21411] malloc: realloc documentation error
2612 [21426] network: sys/socket.h uio.h namespace
2613 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2614 [21445] libc: signal.h bsd_signal namespace
2615 [21455] network: Network headers stdint.h namespace
2616 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2618 [21475] network: resolv: Overlong search path is truncated mid-label
2619 [21511] libc: sigstack namespace
2620 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2621 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2622 bits/syscall.h: No such file or directory
2623 [21517] libc: struct sigaltstack namespace
2624 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2625 [21533] localedata: Update locale data to Unicode 10.0
2627 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2628 junk at end of line, first unrecognized character is `@'
2629 [21538] libc: SIG_HOLD missing for XPG4
2630 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2631 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2632 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2633 [21543] libc: sigevent namespace
2634 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2635 size for general purpose registers in mcontext_t structure
2636 [21550] libc: sigwait namespace
2637 [21552] libc: XPG4 bsd_signal namespace
2638 [21554] libc: sigpause namespace
2639 [21560] libc: sys/wait.h signal.h namespace
2640 [21561] libc: waitid namespace
2641 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2642 '/usr/include/stdlib.h': Permission denied
2643 [21575] libc: sys/wait.h missing struct rusage definition
2644 [21584] libc: sigaltstack etc namespace
2645 [21597] libc: siginterrupt namespace
2646 [21607] math: hppa: FAIL: math/test-tgmath
2647 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2649 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2650 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2651 stack and heap (CVE-2017-1000366)
2652 [21625] libc: wait3 namespace
2653 [21654] nss: Incorrect pointer alignment in NSS group merge result
2655 [21657] network: Parse interface zone id for node-local multicast
2656 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2658 [21666] libc: .symver is used on common symbol
2659 [21668] network: resolv: res_init cross-thread broadcast introduces race
2661 [21687] math: tgmath.h totalorder, totalordermag return type
2662 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2664 [21696] libc: Incorrect assumption of of __cpu_mask in
2665 posix/sched_cpucount.c
2666 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2667 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2669 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2670 leading to relocation crash
2671 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2672 `resolv_conf_matches (resp, conf)' failed.
2673 [21710] localedata: Added Samoan language locale for Samoa
2674 [21711] localedata: Pashto yesstr/nostr locale are missing
2675 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2676 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2677 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2678 [21723] localedata: yesstr/nostr missing for Chinese language locale
2679 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2681 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2683 [21728] localedata: New Locale for Tongan language
2684 [21729] localedata: incorrect LC_NAME fields for hi_IN
2685 [21733] localedata: yesstr and nostr are missing for zh_HK
2686 [21734] localedata: Missing yesstr and nostr are for kw_GB
2687 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2688 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2689 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2690 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2692 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2694 [21749] localedata: Wrong abbreviated day name (“abday”) for
2696 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2697 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2698 [21759] localedata: missing yesstr and nostr for Tigrinya
2699 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2700 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2701 [21767] localedata: Missing Bislama locales
2702 [21768] localedata: Missing yesstr and nostr for aa_ET
2703 [21770] localedata: Missing Field in li_NL
2704 [21778] nptl: Robust mutex may deadlock
2705 [21779] libc: MicroBlaze segfaults when loading libpthread
2706 [21783] localedata: Fix int_select international_call_prefixes
2707 [21784] localedata: Inconsistency in country_isbn
2708 [21788] localedata: Missing Country Postal Abbreviations
2709 [21794] localedata: Added-country_isbn-for-Italy
2710 [21795] localedata: Add/Fix country_isbn for France
2711 [21796] localedata: Added country_isbn for Republic of Korea
2712 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2713 [21799] localedata: Added int_select international_call_prefixes
2714 [21801] localedata: Added int_select international_call_prefixes
2715 [21804] nptl: Double semicolon in thread-shared-types.h
2716 [21807] localedata: LC_ADDRESS fix for pap_CW
2717 [21808] localedata: Fix LC_ADDRESS for pap_AW
2718 [21821] localedata: Added country_name in mai_IN
2719 [21822] localedata: Fix LC_TIME for mai_IN
2720 [21823] localedata: missing yesstr, nostr for sa_IN
2721 [21825] localedata: Fix name_mrs for mag_IN
2722 [21828] localedata: 2.26 changelog should mention user visible changes
2724 [21835] localedata: Added Maithili language locale for Nepal
2725 [21838] localedata: Removed redundant data for the_NP
2726 [21839] localedata: Fix LC_MONETARY for ta_LK
2727 [21844] localedata: Fix Latin characters and Months Sequence.
2728 [21848] localedata: Fix mai_NP Title Name
2733 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2734 24731-2:2010, is supported to enable declarations of functions from that
2735 TR. Note that not all functions from that TR are supported by the GNU C
2738 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2739 18661-1:2014, is supported to enable declarations of functions and macros
2740 from that TS. Note that not all features from that TS are supported by
2743 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2744 18661-4:2015, is supported to enable declarations of functions and macros
2745 from that TS. Note that most features from that TS are not supported by
2748 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2749 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2750 Since the GNU C Library defaults to a much newer revision of POSIX, this
2751 will only affect programs that specifically request an old conformance
2752 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2753 see a change in the visible declarations, but a program compiled with
2754 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2757 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2758 defined by all multithreaded code, but glibc has not required this for
2761 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2762 means that in a future release, the macros “major”, “minor”, and “makedev”
2763 will only be available from <sys/sysmacros.h>.
2765 These macros are not part of POSIX nor XSI, and their names frequently
2766 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2767 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2768 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2771 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2772 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2773 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2775 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2776 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2777 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2778 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2779 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2780 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2781 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2782 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2783 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2784 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2785 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2788 * New <math.h> features are added from TS 18661-1:2014:
2790 - Signaling NaN macros: SNANF, SNAN, SNANL.
2792 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2793 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2794 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2796 - llogb functions: the llogb, llogbf and llogbl functions, and the
2797 FP_LLOGB0 and FP_LLOGBNAN macros.
2799 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2802 - Comparison macros: iseqsig.
2804 - Classification macros: iscanonical, issubnormal, iszero.
2806 - Total order functions: totalorder, totalorderf, totalorderl,
2807 totalordermag, totalordermagf, totalordermagl.
2809 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2811 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2812 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2814 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2815 are added to libc. They convert a floating-point number into string.
2817 * Most of glibc can now be built with the stack smashing protector enabled.
2818 It is recommended to build glibc with --enable-stack-protector=strong.
2819 Implemented by Nick Alcock (Oracle).
2821 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2822 intended to be used instead of memset() to erase sensitive data after use;
2823 the compiler will not optimize out calls to explicit_bzero even if they
2824 are "unnecessary" (in the sense that no _correct_ program can observe the
2825 effects of the memory clear).
2827 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2828 to float instead of double. This does not affect the ABI of any libraries
2829 that are part of the GNU C Library, but may affect the ABI of other
2830 libraries that use this type in their interfaces.
2832 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2833 float_t and double_t types are now defined to long double instead of float
2834 and double. These options are not the default, and this does not affect
2835 the ABI of any libraries that are part of the GNU C Library, but it may
2836 affect the ABI of other libraries that use this type in their interfaces,
2837 if they are compiled or used with those options.
2839 * The getentropy and getrandom functions, and the <sys/random.h> header file
2842 * The buffer size for byte-oriented stdio streams is now limited to 8192
2843 bytes by default. Previously, on Linux, the default buffer size on most
2844 file systems was 4096 bytes (and thus remains unchanged), except on
2845 network file systems, where the buffer size was unpredictable and could be
2846 as large as several megabytes.
2848 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2849 for the Linux quota interface which predates kernel version 2.4.22 has
2852 * The malloc_get_state and malloc_set_state functions have been removed.
2853 Already-existing binaries that dynamically link to these functions will
2854 get a hidden implementation in which malloc_get_state is a stub. As far
2855 as we know, these functions are used only by GNU Emacs and this change
2856 will not adversely affect already-built Emacs executables. Any undumped
2857 Emacs executables, which normally exist only during an Emacs build, should
2858 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2860 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2861 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2862 “no-ip6-dotint” had already been the default, and support for the
2863 “ip6-dotint” option was removed from the Internet in 2006.
2865 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2866 flag from <resolv.h> have been removed. The option relied on a
2867 backwards-incompatible DNS extension which was never deployed on the
2870 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2871 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2872 They were already unimplemented.
2874 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2875 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2876 removed again from the IETF name lookup interface specification in RFC
2877 2553. Applications should use getaddrinfo instead.
2879 * DNSSEC-related declarations and definitions have been removed from the
2880 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2881 decode the data part of DNSSEC record types. Previous versions of glibc
2882 only implemented minimal support for the previous version of DNSSEC, which
2883 is incompatible with the currently deployed version.
2885 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2886 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2887 <arpa/nameser.h> header file because the distinction between RR types and
2888 meta-RR types is not officially standardized, subject to revision, and
2889 thus not suitable for encoding in a macro.
2891 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2892 and rhook members of the res_state type in <resolv.h> have been removed.
2893 The glibc stub resolver did not support these hooks, but the header file
2894 did not reflect that.
2896 * For multi-arch support it is recommended to use a GCC which has
2897 been built with support for GNU indirect functions. This ensures
2898 that correct debugging information is generated for functions
2899 selected by IFUNC resolvers. This support can either be enabled by
2900 configuring GCC with '--enable-gnu-indirect-function', or by
2901 enabling it by default by setting 'default_gnu_indirect_function'
2902 variable for a particular architecture in the GCC source file
2905 * GDB pretty printers have been added for mutex and condition variable
2906 structures in POSIX Threads. When installed and loaded in gdb these pretty
2907 printers show various pthread variables in human-readable form when read
2908 using the 'print' or 'display' commands in gdb.
2910 * Tunables feature added to allow tweaking of the runtime for an application
2911 program. This feature can be enabled with the '--enable-tunables' configure
2912 flag. The GNU C Library manual has details on usage and README.tunables has
2913 instructions on adding new tunables to the library.
2915 * A new version of condition variables functions have been implemented in
2916 the NPTL implementation of POSIX Threads to provide stronger ordering
2919 * A new version of pthread_rwlock functions have been implemented to use a more
2920 scalable algorithm primarily through not using a critical section anymore to
2923 Security related changes:
2925 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2926 have been created with makecontext could fail to terminate due to a
2927 missing .cantunwind annotation. This has been observed to lead to a hang
2928 (denial of service) in some Go applications compiled with gccgo. Reported
2929 by Andreas Schwab. (CVE-2016-6323)
2931 * The DNS stub resolver functions would crash due to a NULL pointer
2932 dereference when processing a query with a valid DNS question type which
2933 was used internally in the implementation. The stub resolver now uses a
2934 question type which is outside the range of valid question type values.
2937 The following bugs are resolved with this release:
2939 [4099] stdio: Overly aggressive caching by stream i/o functions.
2940 [7065] build: Support building glibc with -fstack-protector or -fstack-
2942 [9842] localedata: en_CA: incorrect date format
2943 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2944 before it started waiting
2945 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2946 [15765] nptl: sem_open is wrongly a cancellation point
2947 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2948 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2950 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2951 library linked with pthread
2952 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2953 "FIXME: Ingo" issue)
2954 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2955 [17252] libc: getrandom and getentropy syscall
2956 [17730] malloc: thread-local storage is sometimes improperly free()'d
2957 after being __libc_memalign()'d
2958 [18241] stdio: failed fseek on memstream does not set errno and can fail
2960 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2962 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2963 PTHREAD_PRIO_INHERIT mutex on ARM
2964 [18784] network: res_query and related function crash for special record
2965 type queries (CVE-2015-5180)
2966 [19380] math: strtod does not raise "inexact"
2967 [19387] string: Integer overflow in memchr
2968 [19390] string: Integer overflow in strncat
2969 [19398] build: linknamespace tests fail with massively parallel build
2970 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2972 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2973 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2974 [19514] libc: [PATCH] Fix spelling errors in spelling
2975 "implement"/"implementation" in several places
2976 [19582] network: Deprecate RES_USE_INET6
2977 [19673] manual: clog10 docs appear to be erroneous
2978 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2979 causes a segmentation fault
2980 [19826] libc: invalid pointer returned from __tls_get_addr with static
2982 [20016] network: resolv: Remove hooks support from the API
2983 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2985 [20033] math: [x86_64] vectorized math function don't call the __finite
2987 [20116] nptl: use after free in pthread_create
2988 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2989 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2991 [20311] nptl: please install proc_service.h
2992 [20366] libc: Compilation errors in installed headers in strict-compliance
2994 [20370] malloc: malloc: Arena free list management is still racy
2995 (incorrect fix in bug 19243)
2996 [20386] libc: assert (X = 0) does not result in GCC warning
2997 [20432] malloc: malloc: Minimize interface required for interposition
2998 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2999 in _Unwind_Backtrace (CVE-2016-6323)
3000 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3001 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3003 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3004 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3005 [20477] network: resolv: incorrect double-checked locking related to
3007 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3009 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3011 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3012 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3013 cause transition penalty
3014 [20517] math: sparcv9 missing fdiml compat symbol
3015 [20524] manual: strverscmp is inconsistent
3016 [20525] libc: <sys/quota.h> should be based on kernel headers
3017 [20539] math: GCC 7 -static -lm fails to link at -O3
3018 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3020 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3022 [20591] network: Remove obsolete DNSSEC support
3023 [20592] network: DNS resource record type classification macros in
3024 <arpa/nameser.h> are incorrect
3025 [20593] network: Update DNS RR type definitions
3026 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3027 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3029 [20629] network: libresolv: Remove support for bitstring labels
3031 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3032 assertion: "maxidx >= 2"
3033 [20660] math: [arm] Use VSQRT
3034 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3035 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3036 [20689] libc: Test for FMA should also check for AVX.
3037 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3038 [20715] math: iszero macro breaks existing code
3039 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3040 [20728] libc: powerpc: Missing TOC stub in clone
3041 [20729] build: glibc-2.24 fails to build for i486 with -Os
3042 [20750] build: Build fails with default PIE enabled gcc-6.x
3043 [20768] math: [alpha] sqrt fegetenv namespace
3044 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3046 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3047 __FLT_EVAL_METHOD__ is 2
3048 [20790] network: rpcgen buffer overrun in get_prog_declaration
3049 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3050 [20829] libc: crypt snprintf namespace
3051 [20847] libc: tst-vfork3 failure
3052 [20855] math: Default bits/mathdef.h has inappropriate float_t
3053 [20859] math: [sh4] FP_ILOGB0 invalid
3054 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3055 U+20AC), not same as GBK
3056 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3057 [20916] math: pow handling of sNaN arguments
3058 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3059 [20919] math: Bad pow (qNaN, 0) result with -lieee
3060 [20940] math: hypot sNaN handling
3061 [20947] math: fmax, fmin sNaN handling
3062 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3063 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3065 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3066 [20973] nptl: robust mutexes: Lost wake-ups
3067 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3068 [20978] nis: strlen on null pointer in nss_nisplus
3069 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3071 [21014] string: i686 memchr overflows internal pointer check
3072 [21019] libc: [mips] n32 lseek incorrect on overflow
3073 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3074 [21026] libc: [MIPS] readahead syscall is broken on n64
3075 [21028] math: Fallback fesetexceptflag should always succeed
3076 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3077 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3079 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3080 [21061] librt: [microblaze] librt lost clock_* exports
3081 [21073] libc: tunables: insecure environment variables passed to
3082 subprocesses with AT_SECURE
3083 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3087 * The minimum Linux kernel version that this version of the GNU C Library
3088 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3089 kernel version 2.6.32 or later suffices (on architectures that already
3090 required kernel versions more recent than 3.2, those requirements remain
3091 unchanged). Linux 3.2 or later kernel headers are required on all
3094 * The pap_AN locale has been deleted. This has been deprecated for a long
3095 time. It has been replaced by pap_AW & pap_CW, both of which have long
3096 been included in previous releases.
3098 * The readdir_r and readdir64_r functions have been deprecated. It is
3099 recommended to use readdir and readdir64 instead.
3101 * The type “union wait” has been removed. It was deprecated in the early
3102 1990s and never part of POSIX. Application code should use the int type
3103 instead of “union wait”.
3105 * A new NSS action is added to facilitate large distributed system
3106 administration. The action, MERGE, allows remote user stores like LDAP
3107 to be merged into local user stores like /etc/groups in order to provide
3108 easy to use, updated, and managed sets of merged credentials. The new
3109 action can be used by configuring it in /etc/nsswitch.conf:
3110 group: files [SUCCESS=merge] nis
3111 Implemented by Stephen Gallagher (Red Hat).
3113 * The deprecated __malloc_initialize_hook variable has been removed from the
3116 * The long unused localedef --old-style option has been removed. It hasn't
3117 done anything in over 16 years. Scripts using this option can safely
3120 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3121 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3122 return the next representable value in the direction of positive infinity
3123 and the nextdown functions return the next representable value in the
3124 direction of negative infinity. These are currently enabled as GNU
3127 Security related changes:
3129 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3130 could result in a stack overflow when getnetbyname was called with an
3131 overly long name. (CVE-2016-3075)
3133 * Previously, getaddrinfo copied large amounts of address data to the stack,
3134 even after the fix for CVE-2013-4458 has been applied, potentially
3135 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3136 instead. Reported by Michael Petlan. (CVE-2016-3706)
3138 * The glob function suffered from a stack-based buffer overflow when it was
3139 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3140 Reported by Alexander Cherepanov. (CVE-2016-1234)
3142 * The Sun RPC UDP client could exhaust all available stack space when
3143 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3144 alloca plugin for GCC. (CVE-2016-4429)
3146 * The IPv6 name server management code in libresolv could result in a memory
3147 leak for each thread which is created, performs a failing naming lookup,
3148 and exits. Over time, this could result in a denial of service due to
3149 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3151 The following bugs are resolved with this release:
3153 [1170] localedata: ne_NP: update Nepali locale definition file
3154 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3156 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3157 [6796] math: fdim() does not set errno on overflow
3158 [10354] libc: posix_spawn should use vfork() in more cases than presently
3159 [11213] localedata: localedata: add copyright disclaimer to locale files
3160 [12143] localedata: chr_US: new Cherokee locale
3161 [12450] localedata: sgs_LT: new locale
3162 [12676] localedata: ln_CD: new locale
3163 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3165 [13304] math: fma, fmaf, fmal produce wrong results
3166 [14259] build: --localedir arg to configure is ignored
3167 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3168 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3169 [14934] localedata: es_CL: wrong first weekday chilean locale
3170 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3172 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3174 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3175 [15368] nptl: raise() is not async-signal-safe
3176 [15479] math: ceil, floor, round and trunc raise inexact exception
3177 [15578] localedata: kk_KZ: various updates
3178 [16003] localedata: pap_AN: punt old locale
3179 [16137] localedata: iw_IL: punt old locale
3180 [16190] localedata: eo: new esperanto locale
3181 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3182 [16742] malloc: race condition: pthread_atfork() called before first
3183 malloc() results in unexpected locking behaviour/deadlocks
3184 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3186 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3187 [17565] localedata: pt_PT: wrong (work-)week start
3188 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3189 [17950] build: Build fails with -msse
3190 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3191 [18433] libc: posix_spawn does not return correctly upon failure to
3193 [18453] localedata: charmaps/IBM875: incorrect codes
3194 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3196 [18896] localedata: he_IL: improvements for currency
3197 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3198 Romanian locale data
3199 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3201 [19056] libc: Deprecate readdir_r
3202 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3204 [19198] localedata: nl_NL: small improvements for Dutch locales
3205 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3206 nameservers (CVE-2016-5417)
3207 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3209 [19400] locale: Language missing in "iso-639.def", trivial fix in
3211 [19431] malloc: Deadlock between fflush, getdelim, and fork
3212 [19505] libc: Incorrect file descriptor validity checks in
3213 posix_spawn_file_actions_add{open,close,dup2}
3214 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3215 when using RTLD_NEXT
3216 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3217 `intl/{gettextP,loadinfo}.h'
3218 [19534] libc: execle, execlp may use malloc
3219 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3220 [19573] network: res_nclose and __res_maybe_init disagree about name
3221 server initialization, breaking Hesiod
3222 [19575] localedata: Status of GB18030 tables
3223 [19581] localedata: sr_* date_fmt string contains additional newline
3224 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3226 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3227 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3228 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3229 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3231 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3233 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3235 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3236 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3237 [19633] locale: strfmon_l applies global locale to number formatting
3238 [19642] network: Memory leak in getnameinfo
3239 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3240 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3242 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3243 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3245 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3246 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3248 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3250 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3252 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3253 pointers and lengths in error-case.
3254 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3255 report errors on UTF-16 surrogates values.
3256 [19755] nscd: nscd assertion failure in gc
3257 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3258 [19759] libc: mempcpy shouldn't be inlined
3259 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3260 [19765] libc: s390 needs an optimized mempcpy
3261 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3262 NAME_MAX limit assumption (CVE-2016-1234)
3263 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3264 [19787] network: Missing and incorrect truncation checks in getnameinfo
3265 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3267 [19791] network: Assertion failure in res_query.c with un-connectable name
3269 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3270 [19822] math: libm.so install clobbers old version
3271 [19825] network: resolv: send_vc can return uninitialized data in second
3272 response to getaddrinfo
3273 [19830] network: nss_dns: should check RDATA length against buffer length
3274 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3275 confronted with A/AAAA records of invalid size
3276 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3277 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3278 [19853] stdio: Printing IBM long double in decimal with high precision is
3280 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3281 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3282 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3284 [19865] network: Assertion failure or memory leak in
3285 _nss_dns_getcanonname_r
3286 [19868] network: nss_dns: netent code does not skip over non-PTR records
3287 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3289 [19881] string: Improve x86-64 memset
3290 [19907] string: Incorrect memcpy tests
3291 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3293 [19925] libc: termios.h XCASE namespace
3294 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3295 [19929] libc: limits.h NL_NMAX namespace
3296 [19931] stdio: Memory leak in vfprintf
3297 [19957] libc: clone(CLONE_VM) access invalid parent memory
3298 [19963] localedata: en_IL: New locale
3299 [19989] stdio: stdio.h cuserid namespace
3300 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3302 [19996] locale: langinfo.h nl_langinfo_l namespace
3303 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3304 [20010] network: getaddrinfo: Stack overflow in hostent translation
3306 [20012] stdio: libio: fmemopen append mode failure
3307 [20014] stdio: stdio.h namespace for pre-threads POSIX
3308 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3309 [20023] libc: fcntl.h timespec namespace
3310 [20024] math: [x86_64] vectorized sincos trashes the stack
3311 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3312 [20041] time: sys/time.h timespec namespace
3313 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3314 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3315 [20051] libc: ttyslot in wrong header under wrong conditions
3316 [20054] libc: gethostname not declared for XPG4
3317 [20055] libc: termios.h missing tcgetsid for XPG4
3318 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3320 [20073] libc: sys/stat.h fchmod namespace
3321 [20074] libc: stdlib.h rand_r namespace
3322 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3323 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3325 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3326 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3328 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3329 [20119] libc: Wrong mask for processors level type from CPUID
3330 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3331 AS not supporting AVX512
3332 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3334 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3335 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3337 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3338 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3339 [20178] libc: posix_spawn{p} should not call exit
3340 [20191] stdio: libio: vtables hardening
3341 [20195] string: FMA4 detection requires CPUID execution with register
3343 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3344 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3346 [20212] math: acos (sNaN) returns sNaN
3347 [20213] math: asin (sNaN) returns sNaN
3348 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3349 [20218] math: [i386] asinhl (sNaN) returns sNaN
3350 [20219] math: [i386] atanhl (sNaN) returns sNaN
3351 [20222] stdio: fopencookie: Mangle function pointers
3352 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3353 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3354 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3356 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3357 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3358 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3359 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3360 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3361 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3362 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3363 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3364 [20240] math: modf (sNaN) returns sNaN
3365 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3366 [20250] math: frexp (sNaN) returns sNaN
3367 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3368 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3370 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3371 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3372 subscript is below array bounds [-Werror=array-bounds]
3373 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3374 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3376 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3377 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3379 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3380 "invalid" exceptions
3381 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3382 [20316] localedata: id_ID: Februari instead of Pebruari
3383 [20327] string: POWER8 strcasecmp returns incorrect result
3384 [20347] math: Failure: Test: j0_downward (0xap+0)
3385 [20348] libc: FAIL: misc/tst-preadvwritev64
3386 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3387 [20350] libc: There is no test for p{read,write}64
3388 [20357] math: Incorrect cos result for 1.5174239687223976
3389 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3393 * Unicode 8.0.0 Support: Character encoding, character type info, and
3394 transliteration tables are all updated to Unicode 8.0.0, using new
3395 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3396 These updates cause user visible changes, such as the fixes for bugs
3397 89, 16061, and 18568.
3399 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3400 kernel-internal CPU set size. This means that requests that change the
3401 CPU affinity which failed before (for example, an all-ones CPU mask) will
3402 now succeed. Applications that need to determine the effective CPU
3403 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3404 setting it because the kernel can adjust it (and the previous size check
3405 would not detect this in the majority of cases).
3407 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3408 the following new symbols are used: fts64_children, fts64_close,
3409 fts64_open, fts64_read and fts64_set.
3411 * getaddrinfo now detects certain invalid responses on an internal netlink
3412 socket. If such responses are received, an affected process will
3413 terminate with an error message of "Unexpected error <number> on netlink
3414 descriptor <number>" or "Unexpected netlink response of size <number> on
3415 descriptor <number>". The most likely cause for these errors is a
3416 multi-threaded application which erroneously closes and reuses the netlink
3417 file descriptor while it is used by getaddrinfo.
3419 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3420 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3421 unnecessary serialization of memory allocation requests across threads.
3422 The defect is now corrected. Users should see a substantial increase in
3423 the concurent throughput of allocation requests for applications which
3424 trigger this bug. Affected applications typically create and
3425 destroy threads frequently. (Bug 19048 was reported and analyzed by
3428 * There is now a --disable-timezone-tools configure option for disabling the
3429 building and installing of the timezone related utilities (zic, zdump, and
3430 tzselect). This is useful for people who build the timezone data and code
3431 independent of the GNU C Library.
3433 * The obsolete header <regexp.h> has been removed. Programs that require
3434 this header must be updated to use <regex.h> instead.
3436 * The obsolete functions bdflush, create_module, get_kernel_syms,
3437 query_module and uselib are no longer available to newly linked binaries;
3438 the header <sys/kdaemon.h> has been removed. These functions and header
3439 were specific to systems using the Linux kernel and could not usefully be
3440 used with the GNU C Library on systems with version 2.6 or later of the
3443 * Optimized string, wcsmbs and memory functions for IBM z13.
3444 Implemented by Stefan Liebler.
3446 * Newly linked programs that define a variable called signgam will no longer
3447 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3448 require signgam to be set by those functions must ensure that they use the
3449 variable provided by the GNU C Library and declared in <math.h>, without
3450 defining their own copy.
3452 * The minimum GCC version that can be used to build this version of the GNU
3453 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3454 still be used to compile programs using the GNU C Library.
3456 Security related changes:
3458 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3459 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3461 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3462 the pointer guard feature. It is always enabled. Previously,
3463 LD_POINTER_GUARD could be used to disable security hardening in binaries
3464 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3467 * An integer overflow in hcreate and hcreate_r could lead to an
3468 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3470 * The catopen function no longer has unbounded stack usage. Reported by
3471 Max. (CVE-2015-8779)
3473 * The nan, nanf and nanl functions no longer have unbounded stack usage
3474 depending on the length of the string passed as an argument to the
3475 functions. Reported by Joseph Myers. (CVE-2014-9761)
3477 * A stack-based buffer overflow was found in libresolv when invoked from
3478 libnss_dns, allowing specially crafted DNS responses to seize control
3479 of execution flow in the DNS client. The buffer overflow occurs in
3480 the functions send_dg (send datagram) and send_vc (send TCP) for the
3481 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3482 family. The use of AF_UNSPEC triggers the low-level resolver code to
3483 send out two parallel queries for A and AAAA. A mismanagement of the
3484 buffers used for those queries could result in the response of a query
3485 writing beyond the alloca allocated buffer created by
3486 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3487 the overflow. Thanks to the Google Security Team and Red Hat for
3488 reporting the security impact of this issue, and Robert Holiday of
3489 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3491 The following bugs are resolved with this release:
3493 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3494 [887] math: Math library function "logb" and "nextafter" inconsistent
3495 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3496 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3497 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3498 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3500 [4404] localedata: German translation of "Alarm clock" is misleading
3501 [6799] math: nextafter() and nexttoward() doen't set errno on
3502 overflow/underflow errors
3503 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3505 [10432] nis: _nss_nis_setnetgrent assertion failure
3506 [11460] libc: fts has no LFS support
3507 [12926] network: getaddrinfo()/make_request() may spin forever
3508 [13065] nptl: Race condition in pthread barriers
3509 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3510 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3512 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3513 [14912] libc: Rename non-installed bits/*.h headers
3514 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3515 [15367] math: Let gcc use __builtin_isinf
3516 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3517 [15421] math: lgamma wrongly sets signgam for ISO C
3518 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3519 FE_INVALID with argument out of range
3520 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3522 [15786] dynamic-link: ifunc resolver functions can smash function
3524 [15918] math: Unnecessary check for equality in hypotf()
3525 [16061] localedata: Review / update transliteration data
3526 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3528 [16141] time: strptime %z offset restriction
3529 [16171] math: drem should be alias of remainder
3530 [16296] math: fegetround is pure?
3531 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3532 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3534 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3535 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3537 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3538 "Exception "Inexact" set" on ppc32
3539 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3540 [16517] math: Missing underflow exception from tanf/tan/tanl
3541 [16519] math: Missing underflow exception from sinhf
3542 [16520] math: Missing underflow exception from tanhf
3543 [16521] math: Missing underflow exception from exp2
3544 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3546 [16734] stdio: fopen calls mmap to allocate its buffer
3547 [16961] math: nan function incorrect handling of bad sequences
3548 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3549 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3550 [16985] locale: localedef: confusing error message when opening output
3552 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3553 [17197] locale: Redundant shift character in iconv conversion output at
3555 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3556 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3557 [17250] dynamic-link: static linking breaks nss loading
3558 (getaddrinfo/getpwnam/etc...)
3559 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3561 [17441] math: isnan() should use __builtin_isnan() in GCC
3562 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3563 (related to lock elision)
3564 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3565 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3566 [17887] time: strptime should be able to parse "+01:00" style timezones
3567 [17905] libc: catopen() Multiple unbounded stack allocations
3569 [18084] libc: backtrace (..., 0) dumps core on x86
3570 [18086] libc: nice() sets errno to 0 on success
3571 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3572 is too large (CVE-2015-8778)
3573 [18251] dynamic-link: SONAME missing when audit modules provides path
3574 [18265] libc: add attributes for wchar string and memory functions
3575 [18370] math: csqrt missing underflows
3576 [18421] libc: [hppa] read-only segment has dynamic relocations
3577 [18472] libc: Obsolete syscall wrappers should be compat symbols
3578 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3579 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3580 [18525] localedata: Remove locale timezone information
3581 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3582 [18568] localedata: Update locale data to Unicode 8.0
3583 [18589] locale: sort-test.sh fails at random
3584 [18595] math: ctan, ctanh missing underflows
3585 [18604] libc: assert macro-expands its argument
3586 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3587 contains a vector instruction exception.
3588 [18611] math: j1, jn missing errno setting on underflow
3589 [18618] localedata: sync Chechen locale definitions with other *_RU
3591 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3592 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3593 [18665] network: In send_dg, the recvfrom function is NOT always using the
3594 buffer size of a newly created buffer (CVE-2015-7547)
3595 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3597 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3599 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3600 [18699] math: tilegx cproj() for various complex infinities does not yield
3602 [18724] libc: Harden put*ent functions against data injection
3603 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3604 [18755] build: build errors with -DNDEBUG
3605 [18757] stdio: fmemopen fails to set errno on failure
3606 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3608 [18781] libc: openat64 lacks O_LARGEFILE
3609 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3610 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3611 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3612 [18790] math: [ldbl-128ibm] tanhl inaccurate
3613 [18795] libc: stpncpy fortification misses buffer lengths that are
3614 statically too large
3615 [18796] build: build fails for --disable-mathvec
3616 [18803] math: hypot missing underflows
3617 [18820] stdio: fmemopen may leak memory on failure
3618 [18823] math: csqrt spurious underflows
3619 [18824] math: fma spurious underflows
3620 [18825] math: pow missing underflows
3621 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3622 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3623 [18870] build: sem_open.c fails to compile with missing symbol
3625 [18872] stdio: Fix memory leak in printf_positional
3626 [18873] libc: posix_fallocate overflow check ineffective
3627 [18875] math: Excess precision leads incorrect libm
3628 [18877] libc: arm: mmap offset regression
3629 [18887] libc: memory corruption when using getmntent on blank lines
3630 [18918] localedata: hu_HU: change time to HH:MM:SS format
3631 [18921] libc: Regression: extraneous stat() and fstat() performed by
3633 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3634 binaries (CVE-2015-8777)
3635 [18951] math: tgamma missing underflows
3636 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3638 [18953] localedata: lt_LT: change currency symbol to the euro
3639 [18956] math: powf inaccuracy
3640 [18961] math: [i386] exp missing underflows
3641 [18966] math: [i386] exp10 missing underflows
3642 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3643 [18969] build: multiple string test failures due to missing locale
3645 [18970] libc: Reference of pthread_setcancelstate in libc.a
3646 [18977] math: float / long double Bessel functions not in XSI POSIX
3647 [18980] math: i386 libm functions return with excess range and precision
3648 [18981] math: i386 scalb*, ldexp return with excess range and precision
3649 [18982] stdio: va_list and vprintf
3650 [18985] time: Passing out of range data to strftime() causes a segfault
3652 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3653 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3654 [19012] locale: iconv_open leaks memory on error path
3655 [19016] math: clog, clog10 inaccuracy
3656 [19018] nptl: Mangle function pointers in tls_dtor_list
3657 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3658 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3659 [19048] malloc: malloc: arena free list can become cyclic, increasing
3661 [19049] math: [powerpc] erfc incorrect zero sign
3662 [19050] math: [powerpc] log* incorrect zero sign
3663 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3664 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3665 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3666 [19074] network: Data race in _res_hconf_reorder_addrs
3667 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3668 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3669 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3671 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3673 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3674 [19086] manual: posix_fallocate64 documented argument order is wrong.
3675 [19088] math: lround, llround missing exceptions close to overflow
3677 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3678 [19095] math: dbl-64 lrint incorrect for 64-bit long
3679 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3680 [19124] dynamic-link: ld.so failed to build with older assmebler
3681 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3682 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3683 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3684 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3685 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3686 pthread_setaffinity_np
3687 [19156] math: [ldbl-128] j0l spurious underflows
3688 [19164] nptl: tst-getcpu fails with many possible CPUs
3689 [19168] math: math/test-ildoubl and math/test-ldouble failure
3690 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3691 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3693 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3694 (FE_NOMASK_ENV) do not clear SSE exceptions
3695 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3696 _int_new_arena/reused_arena
3697 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3698 [19201] math: dbl-64 remainder incorrect sign of zero result
3699 [19205] math: bits/math-finite.h conditions do not match math.h and
3701 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3702 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3703 for C99-based standards
3704 [19212] libc: features.h not -Wundef clean
3705 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3707 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3708 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3709 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3711 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3712 "inexact" exceptions
3713 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3715 [19242] libc: strtol incorrect in Turkish locales
3716 [19243] malloc: reused_arena can pick an arena on the free list, leading
3717 to an assertion failure and reference count corruption
3718 [19253] time: tzset() ineffective when temporary TZ did not include DST
3720 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3721 [19270] math: [hppa] Shared libm missing __isnanl
3722 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3723 MAP_HUGETLB and MAP_STACK defines
3724 [19313] nptl: Wrong __cpu_mask for x32
3725 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3726 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3727 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3728 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3729 [19363] time: x32: times() return value wrongly truncates/sign extends
3731 [19367] dynamic-link: Improve branch prediction on Silvermont
3732 [19369] network: Default domain name not reset by res_ninit when "search"
3733 / "domain" entry is removed from resolv.conf
3734 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3736 [19385] localedata: bg_BG: time separator should be colon, not comma
3737 [19408] libc: linux personality syscall wrapper may erroneously return an
3738 error on 32-bit architectures
3739 [19415] libc: dladdr returns wrong names on hppa
3740 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3741 IBM905, IBM907, and IBM909
3742 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3743 [19443] build: build failures with -DDEBUG
3744 [19451] build: Make check fails on test-double-vlen2
3745 [19462] libc: Glibc failed to build with -Os
3746 [19465] math: Wrong code with -Os
3747 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3749 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3751 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3752 [19486] math: S390: Math tests fail with "Exception Inexact set".
3753 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3754 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3756 [19590] math: Fail to build shared objects that use libmvec.so functions.
3760 * The following bugs are resolved with this release:
3762 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3763 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3764 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3765 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3766 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3767 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3768 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3769 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3770 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3771 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3772 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3773 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3774 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3775 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3776 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3777 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3778 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3779 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3780 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3781 18657, 18676, 18694, 18696, 18887.
3783 * Cache information can be queried via sysconf() function on s390 e.g. with
3784 _SC_LEVEL1_ICACHE_SIZE as argument.
3786 * A buffer overflow in gethostbyname_r and related functions performing DNS
3787 requests has been fixed. If the NSS functions were called with a
3788 misaligned buffer, the buffer length change due to pointer alignment was
3789 not taken into account. This could result in application crashes or,
3790 potentially arbitrary code execution, using crafted, but syntactically
3791 valid DNS responses. (CVE-2015-1781)
3793 * The time zone file parser has been made more robust against crafted time
3794 zone files, avoiding heap buffer overflows related to the processing of
3795 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3796 large time zone data files. Overly long time zone specifiers in the TZ
3797 variable no longer result in stack overflows and crashes.
3799 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3800 for LD and GD on x86 and x86-64, has been implemented. You will need
3801 binutils-2.24 or later to enable this optimization.
3803 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3804 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3805 Hat). These updates cause user visible changes, such as the fix for bug
3808 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3809 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3810 condition in some applications.
3812 * Added vector math library named libmvec with the following vectorized x86_64
3813 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3815 The library can be disabled with --disable-mathvec. Use of the functions is
3816 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3817 Shared library libmvec.so is linked in as needed when using -lm (no need to
3818 specify -lmvec explicitly for not static builds).
3819 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3821 * A new fmemopen implementation has been added with the goal of POSIX
3822 compliance. The new implementation fixes the following long-standing
3823 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3824 old implementation is still present for use be by existing binaries.
3826 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3827 releases. It has been fixed to match 2.19 and older, but binaries built
3828 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3830 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3831 Contributed by Roland McGrath (Google).
3833 * The header <regexp.h> is deprecated, and will be removed in a future
3834 release. Use of this header will trigger a deprecation warning.
3835 Application developers should update their code to use <regex.h> instead.
3837 This header was formerly part of SUS, but was deprecated in 1994 and
3838 removed from the standard in 2001. Also, the glibc implementation
3839 leaks memory. See BZ#18681 for more details.
3843 * The following bugs are resolved with this release:
3845 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3846 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3847 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3848 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3849 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3850 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3851 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3852 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3853 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3854 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3857 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3858 too little memory for the to-be-scanned arguments and overflow the
3859 allocated buffer. The implementation now correctly computes the required
3860 buffer size when using malloc, and switches to malloc from alloca as
3863 * A new semaphore algorithm has been implemented in generic C code for all
3864 machines. Previous custom assembly implementations of semaphore were
3865 difficult to reason about or ensure that they were safe. The new version
3866 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3867 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3868 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3870 * Port to Altera Nios II has been contributed by Mentor Graphics.
3872 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3873 implementations for powerpc64/powerpc64le.
3874 Implemented by Adhemerval Zanella (IBM).
3876 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3877 and powerpc64le. This may improve lock scaling of existing programs on
3878 HTM capable systems. The lock elision code is only enabled with
3879 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3880 powerpc will issue a transaction abort on every syscall to avoid side
3881 effects being visible outside transactions.
3883 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3884 AArch64. Contributed by ARM Ltd.
3886 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3888 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3889 under certain input conditions resulting in the execution of a shell for
3890 command substitution when the application did not request it. The
3891 implementation now checks WRDE_NOCMD immediately before executing the
3892 shell and returns the error WRDE_CMDSUB as expected.
3894 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3895 processing format strings with a large number of format specifiers.
3897 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3898 infinite loop if the DNS response contained a PTR record of an unexpected
3901 * The minimum GCC version that can be used to build this version of the GNU
3902 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3903 still be used to compile programs using the GNU C Library.
3905 * The GNU C Library is now built with -Werror by default. This can be
3906 disabled by configuring with --disable-werror.
3908 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3910 * The obsolete sigvec function has been removed. This was the original
3911 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3912 programs have been using instead for about 25 years. Of course, ABI
3913 compatibility for old binaries using sigvec remains intact.
3915 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3916 with newer versions of bison.
3918 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3919 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3920 registers overlay two consecutive single-precision registers. MIPS32R2
3921 introduced a new FPU mode (FR=1) where double-precision registers extend the
3922 corresponding single-precision registers which is incompatible with the
3923 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3924 require the use of FR=1 making a transition necessary. New o32 ABI
3925 extensions enable users to migrate over time from the original o32 ABI
3926 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3927 tracks the ABI of any loaded object and verifies that new objects are
3928 compatible. Mode transitions will also be requested as required and
3929 unsupportable objects will be rejected. The ABI checks include both soft and
3930 hard float ABIs for o32, n32 and n64.
3932 GCC 5 with GNU binutils 2.25 onwards:
3933 It is strongly recommended that all o32 system libraries are built using the
3934 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3935 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3936 compiler using --with-fp-32=xx to set this by default.
3940 * The following bugs are resolved with this release:
3942 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3943 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3944 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3945 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3946 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3947 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3948 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3949 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3950 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3951 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3952 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3953 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3954 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3955 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3956 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3958 * Reverted change of ABI data structures for s390 and s390x:
3959 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3960 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3961 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3962 are preserved pointing straight to the same implementation as the old ones.
3963 Given that, new callers will simply provide a too-big buffer to these
3964 functions. Any applications/libraries out there that embed jmp_buf or
3965 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3966 against 2.19 headers will have to rebuilt again. This is necessary in any
3967 case to revert the breakage in their ABI caused by the glibc change.
3969 * Support for file description locks is added to systems running the
3970 Linux kernel. The standard file locking interfaces are extended to
3971 operate on file descriptions, not file descriptors, via the use of
3972 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3973 are associated with an open file instead of a process.
3975 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3977 * The minimum Linux kernel version that this version of the GNU C Library
3978 can be used with is 2.6.32.
3980 * Running the testsuite no longer terminates as soon as a test fails.
3981 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3982 with PASS or FAIL lines for individual tests. A summary of the results is
3983 printed, including a list of failing lists, and "make check" exits with
3984 error status if there were any unexpected failures. "make check
3985 stop-on-test-failure=y" may be used to keep the old behavior.
3987 * The am33 port, which had not worked for several years, has been removed
3990 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3991 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3992 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3993 conflicted with POSIX (support for which was removed in 2.19), the
3994 interfaces those macros enabled remain available when compiling with
3995 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3996 test macros defined.
3998 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4000 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4001 This may improve lock scaling of existing programs on TX capable systems.
4002 The lock elision code is only built with --enable-lock-elision=yes and
4003 then requires a GCC version supporting the TX builtins. With lock elision
4004 default mutexes are elided via __builtin_tbegin, if the cpu supports
4005 transactions. By default lock elision is not enabled and the elision code
4008 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4009 copy the path argument. This allowed programs to cause posix_spawn to
4010 deference a dangling pointer, or use an unexpected pathname argument if
4011 the string was modified after the posix_spawn_file_actions_addopen
4014 * All supported architectures now use the main glibc sysdeps directory
4015 instead of some being in a separate "ports" directory (which was
4016 distributed separately before glibc 2.17).
4018 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4019 On configurations that support it (all Linux configurations), it's now
4020 used regardless of the --enable-add-ons switch to configure. It is no
4021 longer possible to build such configurations without pthreads support.
4023 * Locale names, including those obtained from environment variables (LANG
4024 and the LC_* variables), are more tightly checked for proper syntax.
4025 setlocale will now fail (with EINVAL) for locale names that are overly
4026 long, contain slashes without starting with a slash, or contain ".." path
4027 components. (CVE-2014-0475) Previously, some valid locale names were
4028 silently replaced with the "C" locale when running in AT_SECURE mode
4029 (e.g., in a SUID program). This is no longer necessary because of the
4032 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4033 with application code using Intel MPX instructions. (With all previous
4034 versions, the MPX register state could be clobbered when making calls
4035 into or out of a shared library.) Note that while the new dynamic
4036 linker is compatible with all known x86 hardware whether or not it
4037 supports Intel MPX, some x86 instruction-set emulators might fail to
4038 handle the new instruction encodings. This is known to affect Valgrind
4039 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4040 release), and might affect other tools that do instruction emulation.
4042 * Support for loadable gconv transliteration modules has been removed.
4043 The support for transliteration modules has been non-functional for
4044 over a decade, and the removal is prompted by security defects. The
4045 normal gconv conversion modules are still supported. Transliteration
4046 with //TRANSLIT is still possible, and the //IGNORE specifier
4047 continues to be supported. (CVE-2014-5119)
4049 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4050 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4051 resulting a denial-of-service security vulnerability in applications which
4052 use functions related to iconv. (CVE-2014-6040)
4056 * The following bugs are resolved with this release:
4058 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4059 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4060 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4061 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4062 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4063 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4064 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4065 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4066 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4067 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4068 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4069 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4070 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4071 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4072 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4073 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4074 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4075 16431, 16453, 16474, 16506, 16510, 16529
4077 * Slovenian translations for glibc messages have been contributed by the
4078 Translation Project's Slovenian team of translators.
4080 * The public headers no longer use __unused nor __block. This change is to
4081 support compiling programs that are derived from BSD sources and use
4082 __unused internally, and to support compiling with Clang's -fblock
4083 extension which uses __block.
4085 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4086 large collation sequences to optimize multiple passes. This cache
4087 computation may overflow for large collation sequences and may cause a
4088 stack or buffer overflow. This is now fixed to use a slower algorithm
4089 which does not use a cache if there is an integer overflow.
4091 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4092 rules for large collation sequences to optimize multiple passes and falls
4093 back to alloca if malloc fails, resulting in a possible stack overflow.
4094 The implementation now falls back to an uncached collation sequence lookup
4097 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4098 initialized for static applications resulting in the security feature
4099 being disabled. The pointer guard is now correctly initialized to a
4100 random value for static applications. Existing static applications need
4101 to be recompiled to take advantage of the fix (bug 15754).
4103 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4104 to the d_name member of struct dirent, or omit the terminating NUL
4105 character. (Bugzilla #14699).
4107 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4108 aligned_alloc functions could allocate too few bytes or corrupt the
4109 heap when passed very large allocation size values (Bugzilla #15855,
4112 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4113 for AF_INET6 has been fixed (Bugzilla #16072).
4115 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4116 pap_CW, quz_PE, the_NP.
4118 * Substantially revised locales: gd_GB, ht_HT
4120 * The LC_ADDRESS field was updated to support country_car for almost all
4123 * ISO 1427 definitions were updated.
4125 * ISO 3166 definitions were updated.
4127 * The localedef utility now supports --big-endian and --little-endian
4128 command-line options to generate locales for a different system from that
4129 for which the C library was built.
4131 * Binary locale files now only depend on the endianness of the system for
4132 which they are generated and not on other properties of that system. As a
4133 consequence, binary files generated with new localedef may be incompatible
4134 with old versions of the GNU C Library, and binary files generated with
4135 old localedef may be incompatible with this version of the GNU C Library,
4136 in the following circumstances:
4138 + Locale files may be incompatible on m68k systems.
4140 + Locale archive files (but not separate files for individual locales) may
4141 be incompatible on systems where plain "char" is signed.
4143 * The configure option --disable-versioning has been removed. Builds with
4144 --disable-versioning had not worked for several years.
4146 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4147 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4149 * SystemTap probes for malloc have been introduced.
4151 * SystemTap probes for slow multiple precision fallback paths of
4152 transcendental functions have been introduced.
4154 * Support for powerpc64le has been added.
4156 * The soft-float powerpc port now supports e500 processors.
4158 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4160 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4161 set of header declarations that are enabled by default, even when other
4162 feature test macros or compiler options such as -std=c99 would otherwise
4163 disable some of those declarations.
4165 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4166 conflict with POSIX. The libbsd-compat library (which was a dummy library
4167 that did nothing) has also been removed.
4169 * Preliminary documentation about Multi-Thread, Async-Signal and
4170 Async-Cancel Safety has been added.
4172 * Change of ABI data structures for s390 and s390x:
4173 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4174 allow for future hardware extensions. All library functions that accept or
4175 return these structures were versioned in order to provide backwards
4176 compatibility with existing code. However, not all cases can be handled
4177 with interface versioning. If an application embeds either structure into
4178 another structure and that structure is passed to another compilation unit
4179 which expects the newer larger-sized object then any access to the new
4180 fields will result in undefined behaviour. Similarly any access to fields
4181 that were moved by the enlarging of the structures will cause undefined
4182 behaviour. To fix the undefined behaviour all objects that are part of the
4183 final in-memory image must agree on the size of structures, and this may
4184 require recompilation.
4188 * The following bugs are resolved with this release:
4190 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4191 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4192 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4193 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4194 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4195 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4196 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4197 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4198 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4199 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4200 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4201 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4202 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4205 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4206 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4207 Distributions can re-enable building and using pt_chown via the new configure
4208 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4209 considerable security risks and should only be used if the distribution
4210 understands and accepts the risks.
4212 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4215 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4216 fixed (Bugzilla #15330).
4218 * Add support for calling C++11 thread_local object destructors on thread
4219 and program exit. This needs compiler support for offloading C++11
4220 destructor calls to glibc.
4222 * Improved worst case performance of libm functions with double inputs and
4225 * Support for priority inherited mutexes in pthread condition variables on
4226 non-x86 architectures.
4228 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4230 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4232 * Optimized string functions for ARM. Implemented by Will Newton and
4235 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4237 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4240 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4241 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4243 * Added a benchmark framework to track performance of functions in glibc.
4245 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4246 It is based on draft TS 18661 and currently enabled as a GNU extension.
4248 * On Linux, the clock function now uses the clock_gettime system call
4249 for improved precision, rather than old times system call.
4251 * Added support for version-3 tz format files. This is needed when using
4252 the tz database release 2013e or later, and affects a few unusual cases --
4253 currently only TZ='America/Godthab' for time stamps after 2037.
4255 * Added new API functions pthread_getattr_default_np and
4256 pthread_setattr_default_np to get and set the default pthread
4257 attributes of a process.
4259 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4260 This may improve lock scaling of existing programs on TSX capable systems.
4261 When the --enable-lock-elision=yes parameter is specified at configure
4262 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4265 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4266 availability). Implemented by Ryan S. Arnold.
4268 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4272 * The following bugs are resolved with this release:
4274 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4275 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4276 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4277 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4278 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4279 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4280 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4281 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4282 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4283 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4284 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4285 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4286 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4287 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4288 14879, 14889, 14893, 14898, 14914.
4290 * Optimization of memcpy for MIPS.
4292 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4293 EMFILE has been fixed (Bugzilla #14889).
4295 * The add-on ports collection is now distributed in the "ports" subdirectory
4296 of the main GNU C Library distribution, rather than separately.
4298 * Port to ARM AArch64 contributed by Linaro.
4300 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4301 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4303 Implemented by Andreas Krebbel.
4305 * The new function secure_getenv allows secure access to the environment,
4306 returning NULL if running in a SUID/SGID process. This function replaces
4307 the internal function __secure_getenv.
4309 * SystemTap static probes have been added into the dynamic linker.
4310 Implemented by Gary Benson.
4312 * Optimizations of string functions strstr, strcasestr and memmem.
4313 Implemented by Maxim Kuvyrkov.
4315 * The minimum Linux kernel version that this version of the GNU C Library
4316 can be used with is 2.6.16.
4318 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4319 powerpc POWER7. Implemented by Will Schmidt.
4321 * New configure option --disable-nscd builds the C library such that it
4322 never attempts to contact the Name Service Caching Daemon (nscd).
4323 New configure option --disable-build-nscd avoids building nscd itself;
4324 this is the default if --disable-nscd is used.
4326 * Improved support for cross-compilation, including cross-testing and
4327 bootstrap builds without a previously built glibc.
4329 * Several testsuite tests are now able to test multiple IFUNC variants of an
4330 interface, rather than just testing the one that would be chooen by
4333 * New configure options --with-bugurl and --with-pkgversion, for
4334 distributors to use to embed their bug-reporting and package version
4335 information in --help and --version output.
4337 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4338 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4339 allows creation of chroots without the procfs mounted on /proc.
4341 * The `crypt' function now fails if passed salt bytes that violate the
4342 specification for those values. On Linux, the `crypt' function will
4343 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4344 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4345 when the mode is enabled.
4347 * The `clock_*' suite of functions (declared in <time.h>) is now available
4348 directly in the main C library. Previously it was necessary to link with
4349 -lrt to use these functions. This change has the effect that a
4350 single-threaded program that uses a function such as `clock_gettime' (and
4351 is not linked with -lrt) will no longer implicitly load the pthreads
4352 library at runtime and so will not suffer the overheads associated with
4353 multi-thread support in other code such as the C++ runtime library.
4355 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4360 * The following bugs are resolved with this release:
4362 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4363 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4364 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4365 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4366 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4367 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4368 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4369 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4370 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4371 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4372 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4373 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4374 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4375 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4376 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4377 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4378 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4379 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4380 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4381 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4382 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4383 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4386 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4387 configuring glibc with:
4388 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4389 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4390 Implemented by H.J. Lu.
4394 + define static_assert
4396 + do not declare gets
4398 + declare at_quick_exit and quick_exit also for ISO C11
4400 + aligned_alloc. NB: The code is deliberately allows the size parameter
4401 to not be a multiple of the alignment. This is a moronic requirement
4402 in the standard but it is only a requirement on the caller, not the
4405 + timespec_get added
4407 + uchar.h support added
4409 + CMPLX, CMPLXF, CMPLXL added
4411 Implemented by Ulrich Drepper.
4413 * Support for the IA-64 has been moved to ports.
4415 * Remove support for anything but ELF binary format
4417 * Checking versions of poll, ppoll added.
4418 Implemented by Ulrich Drepper.
4420 * More generic and 64-bit performance optimizations to math functions.
4421 Implemented by Ulrich Drepper.
4423 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4424 headers and functions available at compile time as they were before
4425 version 2.14. This option will be removed at some time in the future
4426 after the TI-RPC library becomes fully sufficient for the needs of
4427 existing applications.
4429 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4430 Note that glibc is not expected to work with any Linux kernel version
4433 * New header <sys/auxv.h> and function getauxval allowing easy access to
4434 the AT_* key-value pairs passed from the Linux kernel. The header also
4435 defines the HWCAP_* bits associated with the AT_HWCAP key.
4437 * New locales: mag_IN
4439 * New configure option --enable-systemtap builds SystemTap static probes
4440 into libc for setjmp and longjmp and into libpthread for various operations.
4441 So far the setjmp/longjmp probes and some of the libpthread probes are
4442 provided only for i*86 and x86_64.
4443 Implemented by Roland McGrath and Rayson Ho.
4445 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4447 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4450 * More optimized functions for SPARC. Implemented by David S. Miller.
4452 * Improved support for cross-compilation, especially bootstrap builds
4453 without a previously built glibc.
4455 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4456 Chris Metcalf from Tilera.
4458 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4459 now supported for ARM processors.
4461 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4462 as the name of the dynamic linker, to distinguish it from the
4463 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4465 * Support for CRIS has been removed from ports.
4467 * A new class of installed header has been documented for low-level
4468 platform-specific functionality. PowerPC added the first instance with a
4469 function to provide time base register access. Contributed by Tulio
4470 Magno Quites Machado Filho.
4472 * ix86 configurations now install header files that are consistent with
4473 what x86-64 configurations install. These same header files can be used
4474 for -m32, -m64, or -mx32 builds.
4475 Contributed by H.J. Lu.
4477 * Math library bug fixes. A thorough audit of all open math library bugs was
4478 conducted by Joseph Myers. Significant progress was made on many math
4479 library bugs resulting in more accurate exceptions and function results.
4480 Many thanks to all those that contributed including Andreas Jaeger for his
4481 patch review and work on the x87 trigonometric instruction issues.
4483 * Timezone data is no longer installed. Timezone-related binaries and scripts
4484 will continue to be installed. Users should obtain their timezone data from
4485 their distribution provider or from the tzdata package at
4486 <ftp://munnari.oz.au/pub/>.
4490 * The following bugs are resolved with this release:
4492 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4493 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4494 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4495 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4496 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4497 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4498 13484, 13506, 13515, 13523, 13524, 13538, 13540
4500 * New program pldd to list loaded object of a process
4501 Implemented by Ulrich Drepper.
4503 * Add nss_db support back to glibc. No more dependency on Berkeley db
4504 and support for initgroups lookups.
4505 Implemented by Ulrich Drepper.
4507 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4508 Contributed by HJ Lu.
4510 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4511 Contributed by HJ Lu.
4513 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4514 on x86-32 and x86-64.
4515 Contributed by Liubov Dmitrieva.
4517 * Optimized strchr and strrchr for SSE on x86-32.
4518 Contributed by Liubov Dmitrieva.
4520 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4521 for x86-64 and x86-32.
4522 Contributed by Liubov Dmitrieva.
4524 * New interfaces: scandirat, scandirat64
4525 Implemented by Ulrich Drepper.
4527 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4528 Implemented by Ulrich Drepper.
4530 * nscd now also caches the netgroup database.
4531 Implemented by Ulrich Drepper.
4533 * Integrate libm with gcc's -ffinite-math-only option.
4534 Implemented by Ulrich Drepper.
4536 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4537 to math functions. Implemented by Ulrich Drepper.
4539 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4540 Implemented by Ulrich Drepper.
4542 * New Linux interfaces: process_vm_readv, process_vm_writev
4544 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4545 Implemented by Ulrich Drepper.
4547 * Optimized nearbyint and strcasecmp for PPC.
4548 Implemented by Adhemerval Zanella.
4550 * New locales: bho_IN, unm_US, es_CU, ta_LK
4554 * The following bugs are resolved with this release:
4556 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4557 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4558 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4559 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4560 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4561 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4562 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4563 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4564 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4565 12795, 12811, 12813, 12814, 12841
4567 * The RPC implementation in libc is obsoleted. Old programs keep working
4568 but new programs cannot be linked with the routines in libc anymore.
4569 Programs in need of RPC functionality must be linked against TI-RPC.
4570 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4572 Visible changes of this change include (obviously) the inability to link
4573 programs using RPC functions without referencing the TI-RPC library and the
4574 removal of the RPC headers from the glibc headers.
4575 Implemented by Ulrich Drepper.
4577 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4578 syncfs, setns, sendmmsg
4580 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4581 yue_HK, lij_IT, mhr_RU
4583 * New encodings: CP770, CP771, CP772, CP773, CP774
4585 * New program sotruss to trace calls through PLTs
4586 Implemented by Ulrich Drepper.
4588 * The malloc hook implementation is marked deprecated and will be removed
4589 from the default implementation in the next version. The design never
4590 worked ever since the introduction of threads. Even programs which do
4591 not create threads themselves can use multiple threads created internally.
4595 * The following bugs are resolved with this release:
4597 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4598 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4599 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4600 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4603 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4605 * POWER7 optimizations: memset, memcmp, strncmp
4607 * New optimized string functions for x86-64: strnlen (SSE2),
4608 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4609 Implemented by Ulrich Drepper.
4613 * The following bugs are resolved with this release:
4615 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4616 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4617 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4618 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4619 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4620 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4621 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4622 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4624 * New interfaces: pthread_getname_np, pthread_setname_np
4626 * New Linux interface: recvmmsg
4628 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4630 * The dynamic linker now recognizes supported ABI versions from the
4631 EI_ABIVERSION field in the ELF header.
4632 Implemented by Ulrich Drepper.
4634 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4635 will not be used to fill in password fields in the passwd.byname replies.
4636 Instead it is used to synthesize the shadow.byname table, should it be
4637 missing. This is a useful mode in some installations involving Solaris.
4638 Implemented by Ulrich Drepper.
4640 * New locales: kok_IN, sq_MK, cv_RU
4644 * The following bugs are resolved with this release:
4646 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4647 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4648 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4649 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4650 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4651 10789, 10817, 10823, 10840, 10847
4653 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4655 Implemented by Ulrich Drepper.
4657 * Checking version of longjmp added that fails if an uninitialized stack
4658 frame would be created. Implemented by Ulrich Drepper.
4660 * STT_GNU_IFUNC is now supported in static executables.
4661 Implemented by H.J. Lu.
4663 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4665 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4666 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4667 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4668 Contributed by H.J. Lu.
4670 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4671 Implemented by Ulrich Drepper.
4673 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4675 Contributed by H.J. Lu.
4677 * Support for fma instruction in AVX on x86-64.
4678 Implemented by H.J. Lu and Ulrich Drepper.
4680 * AVX support in x86-64 auditing support in ld.so.
4681 Implemented by H.J. Lu.
4683 * STB_GNU_UNIQUE support added.
4684 Implemented by Ulrich Drepper.
4686 * Implement second fallback mode for optimized DNS lookup for even more
4687 broken environments. If two requests from the same port are not
4688 handled correctly close the socket and open a new one before sending
4689 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4690 can be used to select this mode right away, instead of rediscovering the
4691 necessity is every process again.
4692 Implemented by Ulrich Drepper.
4694 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4695 Implemented by Adam Tkac.
4697 * Optimized iconv conversions for S390x.
4698 Implemented by Andreas Krebbel.
4700 * Using condvars with PI mutexes is now more efficient due to kernel
4701 support for requeueing to PI futexes. NPTL support added for x86-64.
4702 Implemented by Ulrich Drepper.
4704 * New locales: ps_AF, my_MM
4708 * The following bugs are resolved with this release:
4710 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4711 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4712 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4713 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4714 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4716 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4717 Implemented by Ulrich Drepper.
4719 * New Linux interfaces: accept4, fallocate, fallocate64.
4720 Implemented by Ulrich Drepper.
4722 * Correct declarations of string function when used in C++ code. This
4723 could lead to compile errors for invalid C++ code.
4725 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4728 * New POSIX 2008 interface: psiginfo
4729 Implemented by Ulrich Drepper.
4731 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4732 Implemented by Ulrich Drepper.
4734 * Support for selecting between multiple function definitions at runtime
4735 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4737 * The libcrypt library can now use the hash function implementations in
4738 NSS. Implemented by Ulrich Drepper.
4740 * The malloc implementation can be compiled to be less memory efficient
4741 but higher performing in multi-threaded programs.
4742 Implemented by Ulrich Drepper.
4744 * New locales: nan_TW@latin, ks_IN
4746 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4747 Implemented by Ulrich Drepper.
4749 * Extended printf hook support. It is possible to use user-defined types
4750 and extend existing format specifiers.
4751 Implemented by Ulrich Drepper.
4753 * Handling for group shadow files has been added.
4754 Implemented by Ulrich Drepper.
4756 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4757 servers (the case, e.g., for some people using the built-in DNS
4758 server in ADSL modems/routers). There is a once-per-process timeout
4759 in case of a broken server. To avoid it, users can run nscd or put
4760 'options single-request' in /etc/resolv.conf.
4761 Implemented by Ulrich Drepper.
4765 * The following bugs are resolved with this release:
4767 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
4768 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
4769 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
4770 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
4771 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
4773 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4774 up at the same time. Implemented by Ulrich Drepper.
4776 * TLS descriptors for LD and GD on x86 and x86-64.
4777 Implemented by Alexandre Oliva.
4779 * getaddrinfo now handles DCCP and UDPlite.
4780 Implemented by Ulrich Drepper.
4782 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4783 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4784 Implemented by Ulrich Drepper.
4786 * New implementation of memmem, strstr, and strcasestr which is O(n).
4787 Implemented by Eric Blake.
4789 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4791 * Implement "e" option for popen to open file descriptor with the
4792 close-on-exec flag set. Implemented by Ulrich Drepper.
4794 * Implement "b" mode for fmemopen. In this mode writes writes don't
4795 implicitly add a NUL byte and seeks from the end of the buffer really
4796 use the buffer end, not the string length as the basis.
4797 Implemented by Ulrich Drepper.
4799 * Many functions, exported and internal, now atomically set the close-on-exec
4800 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4802 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4804 Implemented by Pravin Satpute.
4806 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4810 * The following bugs are resolved with this release:
4812 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4813 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4814 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4815 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4816 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4817 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4818 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4820 * New locales: bo_CN, bo_IN, shs_CA.
4822 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4824 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4825 Implemented by Pravin Satpute.
4827 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4829 * nscd caches now all timeouts for DNS entries
4830 Implemented by Ulrich Drepper.
4832 * nscd is more efficient and wakes up less often.
4833 Implemented by Ulrich Drepper.
4835 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4836 vdprintf, and obstack_vprintf.
4837 Implemented by Jakub Jelinek.
4839 * Faster memset for x86-64.
4840 Implemented by Harsha Jagasia and H.J. Lu.
4842 * Faster memcpy on x86.
4843 Implemented by Ulrich Drepper.
4845 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4846 Implemented by Ulrich Drepper.
4848 * Faster sqrt and sqrtf implemention for some PPC variants.
4849 Implemented by Steven Munroe.
4853 * The following bugs are resolved with this release:
4855 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4856 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4857 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4858 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4859 5071, 5103, 5104, 5112, 5113, 5184, 5186
4861 * More checking functions: fread, fread_unlocked, open*, mq_open.
4862 Implemented by Jakub Jelinek and Ulrich Drepper.
4864 * Extend fortification to C++. Implemented by Jakub Jelinek.
4866 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4867 by not recognizing 'a' as a modifier when those specs are requested.
4868 Implemented by Jakub Jelinek.
4870 * PPC optimizations to math and string functions.
4871 Implemented by Steven Munroe.
4873 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4874 options to be passed. Implemented by Ulrich Drepper.
4876 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4878 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4879 Implemented by Ulrich Drepper.
4881 * Handle private futexes in the NPTL implementation.
4882 Implemented by Jakub Jelinek and Ulrich Drepper.
4884 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4885 Implemented by Roland McGrath and Ulrich Drepper.
4887 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4889 * SHA-256 and SHA-512 based password encryption.
4890 Implemented by Ulrich Drepper.
4892 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4893 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4896 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4897 Implemented by Ulrich Drepper.
4901 * The following bugs are resolved with this release:
4903 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4904 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4905 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4906 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4907 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4908 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4909 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4912 * New Linux interfaces: epoll_pwait, sched_getcpu.
4914 * New generic interfaces: strerror_l.
4916 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4920 * The following bugs are resolved with this release:
4922 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4923 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4924 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4925 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4926 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4927 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4928 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4929 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4930 3225, 3251, 3252, 3253, 3273
4932 * For Linux, the sorting of addresses returned by getaddrinfo now also
4933 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4934 Implemented by Ulrich Drepper.
4936 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4937 Implemented by Ulrich Drepper.
4939 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4941 * New iconv module for MIK. Contributed by Alexander Shopov.
4943 * For sites with broken group and/or passwd database, the auto-propagate
4944 option of nscd can prevent creating ID lookup entries from the results
4945 of a name lookup and vice versa. This usually is no problem but some
4946 site might have problems with the default behavior.
4947 Implemented by Ulrich Drepper.
4949 * Iterating over entire database in NIS can be slow. With the
4950 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4951 to trade time for memory. The entire database will be read at once.
4952 Implemented by Ulrich Drepper.
4954 * The interfaces introduced in RFC 3542 have been implemented by
4957 * Support for the new ELF hash table format was added by Ulrich Drepper.
4959 * Support for priority inheritance mutexes added by Jakub Jelinek and
4962 * Support for priority protected mutexes added by Jakub Jelinek.
4964 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4965 or_IN, csb_PL, fy_NL, sr_ME.
4969 * More overflow detection functions.
4971 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4972 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4974 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4975 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4976 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4977 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4978 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4979 by Masahide Washizawa.
4981 * It is now possible to install audit libraries for the dynamic linker using
4982 LD_AUDIT. Implemented by Ulrich Drepper.
4984 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4985 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4986 For a libc and libpthread that works well on Linux 2.4 kernels, we
4987 recommend using the stable 2.3 branch.
4989 * The new function open_wmemstream acts like open_memstream,
4990 but uses a wchar_t wide character buffer.
4992 * The new function ppoll is an improved version of poll, similar to pselect.
4994 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4995 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4996 renameat, unlinkat, linkat, symlinkat, readlinkat.
4998 * New Linux kernel system calls: unshare,
4999 inotify_init, inotify_add_watch, inotify_rm_watch.
5001 * The euidaccess function is now also known by the alias eaccess,
5002 for compatibility with some other systems.
5004 * Timezone data updated to 2006b version.
5008 * The following bugs are resolved with this release:
5010 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5011 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5012 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5013 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5014 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5015 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5017 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5019 * As of this release, GCC 4 can be used to compile the C Library.
5021 * Timezone data updated to 2005m version.
5025 * The following bugs are resolved with this release:
5027 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5028 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5029 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5030 777, 787, 821, 822, 823, 825
5032 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5036 * Support for RFC 3678. Real implementations exist only for Linux so far.
5037 Implemented by Ulrich Drepper.
5039 * nscd can now cache entries persistently. Expiring entries are reloaded.
5040 For speedups the cache can be shared in memory with client processes.
5041 Implemented by Ulrich Drepper.
5043 * nscd can now perform SELinux checks.
5044 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5046 * getaddrinfo queries are now cached. Canonical name lookup is performed
5048 Implemented by Ulrich Drepper.
5050 * The nothrow function attribute is used when headers are used by gcc when
5051 compiling C code. This can avoid significant amounts of exception
5054 * The malloc functions perform more error checking and are stricter when
5055 it comes to reacting on errors. The default action is to terminate
5056 the process after showing an error message. Implemented by Ulrich Drepper.
5058 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5059 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5061 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5062 namespaces using the new function dlmopen(). This feature is of course,
5063 like most other dynamic loading functionality, not available in statically
5064 linked applications. Implemented by Ulrich Drepper.
5066 * Low-overhead boundary checking variants of string and some stdio functions
5067 were added. These are to be used in conjunction with a gcc patch by
5068 Jakub Jelinek which adds calls to these functions if possible.
5069 Implemented by Jakub Jelinek and Ulrich Drepper.
5071 * Old code for several operating systems and machine architectures that
5072 have not been in working condition in a long time have been removed from
5073 the main source tree maintained by the GNU C Library's maintainers.
5074 These files are now reside in the separate `ports' source module
5075 that is usable as an add-on when building the library.
5079 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5080 interrogate the dynamic linker, compatible with the Solaris interface.
5082 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5083 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5085 * getifaddrs now uses the netlink interface on Linux to get its information.
5086 Implemented by Thorsten Kukuk.
5088 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5089 Implemented by Ulrich Drepper.
5091 * support for non-executable stacks on x86 has been added. Changes mostly
5094 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5097 * getaddrinfo now performs destination address selection according to
5102 * Thread-safe interfaces for many functions that access locale data
5103 were added in version 2.3, but these features were omitted from NEWS.
5104 Many functions have variants with an `_l' suffix that take a `locale_t'
5105 object as a parameter rather than consulting the current locale.
5106 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5107 create and maintain `locale_t' objects. Additionally, the new function
5108 `uselocale' sets "the current locale" (as used by functions not so
5109 parameterized) set for an individual thread. These features were added
5110 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5112 * The functions getresuid, getresgid, setresuid, and setresgid, which
5113 have long been available on Linux, are now declared in <unistd.h>
5114 and are now also available on the Hurd.
5116 * ELF thread-local storage support (TLS) now works on x86-64.
5118 * The new dynamic string token $LIB is expanded in shared library names.
5119 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5121 * Aldy Hernandez contributed complete software floating point support for
5122 PowerPC machines with no FPU.
5124 * fexecve is implemented on Linux.
5126 * The `btowc' function should work at least twice as fast due to
5127 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5129 * With approriate thread add-ons cancelable functions are now implemented
5130 in libc.so as well. No need to call the function in libpthread. This
5131 change allowed to finally disable the incorrect and expensive handling
5132 of weak definition in ld.so.
5134 * Yet more PLT entries in libc.so have been removed. We finally arrived
5135 at the bare minimum. Startup times improved appropriately.
5137 * Support for the new Linux/x86 system call interface was added. The
5138 AT_SYSINFO auxiliary vector entry is recognized and handled.
5142 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5145 * iconv (the program and the interface) now accepts empty names (excluding
5146 options like //TRANSLIT) to mean "use charset of current locale".
5148 * localedef can now transliterate characters in strings which are not in
5149 the provided charmap. The information from the input locale is used.
5151 * Prelinking support was added for ELF targets. This requires additional
5152 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5154 * Read-only stdio streams now use mmap to speed up operation by eliminating
5155 copying and buffer underflows. To use add 'm' to the mode string of
5156 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5158 * The malloc functions were completely rewritten by Wolfram Gloger based
5159 on Doug Lea's malloc-2.7.0.c.
5161 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5162 implementation of regex.
5164 * Bruno Haible upgraded the iconv and locale implementation to support
5167 * Contents of the LC_* and LANG environment variables in the CEN style are
5168 not recognized anymore. It never was used. Change by Ulrich Drepper.
5170 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5171 thread-local storage (TLS) ABI on some platforms.
5172 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5174 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5175 EUC-JISX0213, and TSCII.
5177 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5178 BSD-compatible interface for getting all network interface addresses.
5179 Implementation for IPv4 by Roland McGrath.
5181 * Loading of locale data is faster due to the introduction of a locale
5182 archive. Implemented by Roland McGrath and Ulrich Drepper.
5184 * Startup times are significantly reduced by not using exported functions
5185 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5188 * Steven Munroe contributed a port to PowerPC64/Linux.
5192 * The Hurd now uses the GNU libio implementation of stdio rather than the
5193 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5195 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5196 with the same behavior as the Linux system call of the same name.
5200 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5201 128-bit long double format.
5203 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5204 IBM1161, and IBM1162 charsets.
5206 * Andreas Jaeger contributed a port to x86-64/Linux.
5208 * Peter Bruin contributed a port to PowerPC/Hurd.
5210 * libc functions using I/O streams now can handle wide-oriented streams
5213 * optimizations in the dynamic linker. Binaries created by recent binutils
5214 versions start up quicker due to reduced time spent on relocations.
5216 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5220 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5221 asinh, atanh, j0 for the 128-bit long double format.
5223 * Bruno Haible updated all the code handling Unicode in some form to
5224 support Unicode 3.1.
5226 * Speed of regex for single-byte locales is back to previous levels.
5227 Patch by Isamu Hasegawa.
5229 * Alpha, SPARC, and IA-64 now also using floating stacks.
5231 * Startup time of internationalized applications greatly improved through
5232 iconv cache. Use iconvconfig to generate the cache file.
5233 Contributed by Ulrich Drepper.
5235 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5236 severe performance problems. Patch by David Mosberger.
5238 * The Hurd port got a lot more functionality like AIO, various stdio
5239 extensions, etc. Mainly done by Roland McGrath.
5241 * mtrace can now lookup symbols in shared libraries.
5245 * Intel's IA-64 math library is largely integrated. It provides fast and
5246 accurate implementatations for most basic and standard math functions
5247 in float, double, and long double format.
5249 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5250 and asin for the 96-bit long double format and asin, log, tan for the
5251 128-bit long double format.
5253 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5254 The basic double functions exist today. Contributed by Abraham Ziv
5255 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5256 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5258 * An asynchronous name lookup library was added. The interface is designed
5259 after POSIX AIO. The proposal was circulated beforehand to get comments.
5260 No negative ones came in. Implemented by Ulrich Drepper.
5262 * Port to S390/64bit contributed by Martin Schwidefsky
5263 <schwidefsky@de.ibm.com>.
5265 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5266 of functions for Linux/IA-64.
5268 * The RPC code is now thread safe. Threads can now use the same service
5269 of different services at the same time. Patch by Eric Norum
5270 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5272 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5273 family of functions for Linux/S390.
5275 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5276 of functions for Linux/x86.
5278 * Port to Linux/CRIS contributed by Axis Communications.
5282 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5283 we can now check for namespace violations and missing declarations. The
5284 result is that almost all headers are now Unix-compliant (as defined in
5285 the upcoming XPG6). The negative side is that some programs might need
5286 corrections, too, if they depend on the incorrect form of the headers in
5287 previous versions which defined too many symbols and included too many
5290 * regex now handles multibyte character sets correctly.
5291 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5293 * iconv (the program) does now conform to the upcoming XPG6 and handles
5294 charmaps. Instead of the charset names the path of charmaps can be
5295 provided and the conversion happens based on this data.
5296 Contributed by Ulrich Drepper.
5298 * The locale program now provides detailed information about the installed
5303 only lists the names of the supported locales
5307 provides details such as country, language, and codeset name.
5308 Contributed by Ulrich Drepper.
5312 * The gencat program now parses the input file according to the charset
5313 selected by the LC_CTYPE category. This is important for stateful
5314 character sets. To make generating catalogs easier there is a way
5315 to overwrite the charset selected by the locale: before the first
5316 message or $ quote line the catalog can contain a line like
5318 $ codeset=ISO-8859-2
5320 to select the charset (ISO-8859-2 in this case).
5322 Implemented by Shinya Hanataka and Ulrich Drepper.
5324 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5325 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5326 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5328 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5329 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5331 * The LANGUAGE environment variable is now ignored unless the locale is
5332 changed from the default "C" locale.
5334 * The usual bug fixes.
5338 * Greg McGary added runtime support for bounds checking using gcc's
5339 new -fbounded-pointers option. ix86 target is complete. PowerPC
5342 * Thorsten Kukuk added secure mode support to nscd.
5344 * The Berkeley db libraries have been removed.
5346 Related, the nss_db module is now in a separate package since it
5347 obviously requires a database library being available.
5349 * Wide character I/O streams implemented by Ulrich Drepper.
5351 * Functions from the extended socket API added by Ulrich Drepper.
5353 * Functions feenableexcept and fedisableexcept to control the
5354 behaviour of individual exceptions have been added by Andreas Jaeger.
5356 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5358 * The resolver code has been updated from bind 8.2.3-T5B which supports
5359 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5362 This change could in some situations effect backward compatibility. Since
5363 now `_res' is a thread-local instead of a global variable, modifying it
5364 in one thread does not have any effect in other threads.
5366 The resolver library was also extended to allow IPv6 as the transport
5367 protocol for the requests. This work was done by Stig Venaas.
5369 * Compatibility code for K&R C compilers has been removed from the
5370 header files. A ISO C compiler is needed to use the library
5371 (conforming to either C89 or C99 standard).
5373 * Complete rewrite of the localedef program to support multibyte character
5374 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5375 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5376 Implemented by Ulrich Drepper.
5378 Bruno Haible significantly improved the generation and use of the data
5379 structures for the wide character tables.
5381 * Plural handling in gettext implemented by Ulrich Drepper.
5383 * The utmp daemon has been removed.
5385 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5387 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5390 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5392 * POSIX barriers implemented by Kaz Kylheku.
5394 * POSIX spawn function family implemented by Ulrich Drepper.
5396 * POSIX spinlocks are now available.
5398 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5400 * the configure option --enable-kernel=X.Y.Z allows to strip out
5401 compatibility for kernel versions before X.Y.Z. This is currently only
5402 implemented for Linux.
5404 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5405 field sin6_scope_id. This means that all programs using IPv6 should be
5406 recompiled. Don't expect binary compatibility with previous glibc
5409 * various conversion modules for IBM character sets contributed by
5412 * IA-64 port by Jes Sorensen and HJ Lu.
5426 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5428 * New xdr functions are added; some rpc functions are now 64bit clean.
5430 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5432 * Fixed known incompatibilities with glibc 2.0.
5434 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5436 * Optimized a number of functions (especially the ELF dynamic loader).
5438 * Update timezone data files.
5440 * lots of charmaps corrections
5442 * some new locale definitions and charmaps
5447 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5448 conform to POSIX member type requirements. Symbol versions have been
5449 adjusted as needed within the library, and for direct use by applications,
5450 but there is potential for problems if third-party libraries use
5451 struct timeval as part of their interface. This does not present
5452 a problem for X and other "essential" system libraries.
5454 * An additional locale model to support C++ Standard Library locale
5455 model and probably more was implemented by Ulrich Drepper.
5457 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5460 * Miles Bader provided the `argp' function family to support hierachical
5461 command line argument parsing, layered on top of getopt.
5463 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5465 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5468 * scanf recognizes the %a and %A format for scanning floating point numbers.
5470 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5471 information and interfaces for the available integer types.
5473 * about 130 new math functions were added to implement the ISO C9x math
5476 * the new header <complex.h> contains definitions of the complex math
5477 functions from ISO C 9X.
5479 * the new header <tgmath.h> defines generic macros to use complex or
5480 real valued functions.
5482 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5484 * Andreas Jaeger provided a test suite for the math library.
5486 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5488 * Ulrich Drepper added character set conversion functions (iconv).
5490 * Optimized string functions have been added.
5492 * The localedata addon is now part of glibc.
5494 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5496 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5497 daemon for NSS (nscd).
5499 Missing a better place here are some numbers on improvements. Under
5500 Linux 2.1.125 un-tar-ing the kernel sources takes
5504 using local files 12.19s 6.88s 22.91s
5506 using NIS 13.92s 8.91s 26.34s
5508 using NIS & nscd 10.37s 7.34s 25.30s
5510 using NIS+ 27.57s 30.37s 640.46s
5512 using NIS+ & nscd 10.25s 7.83s 26.51s
5514 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5516 Keep in mind that non-namelookup related operations dominate above times.
5517 It was just a common complain that using NIS+ unpacking the kernel is
5520 [1] The old nscd implementation is not available anymore since it was
5521 distributed with glibc up to version 2.0.98 and thus is now replaced.
5523 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5525 * Mark Kettenis provided a Hesiod NSS module.
5527 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5528 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5530 * rcmd can now handle netgroups (Dick Streefland).
5532 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5535 * Support for the IPv6 protocol has been added to the socket API, as per the
5536 latest draft standards.
5538 * Support for Linux 2.2 has been added.
5540 * Interface changes relative to the latest 2.0.x release:
5541 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5542 addseverity NEW: Unix98
5543 alphasort64 NEW: LFS
5544 argp_err_exit_status NEW: argp, GNU ext
5545 argp_error NEW: argp, GNU ext
5546 argp_failure NEW: argp, GNU ext
5547 argp_help NEW: argp, GNU ext
5548 argp_parse NEW: argp, GNU ext
5549 argp_program_bug_address NEW: argp, GNU ext
5550 argp_program_version NEW: argp, GNU ext
5551 argp_program_version_hook NEW: argp, GNU ext
5552 argp_state_help NEW: argp, GNU ext
5553 argp_usage NEW: argp, GNU ext
5554 authdes_create NEW: Secure RPC
5555 authdes_getucred NEW: Secure RPC
5556 authdes_pk_create NEW: Secure RPC
5557 backtrace NEW: GNU ext.
5558 backtrace_symbols NEW: GNU ext.
5559 backtrace_symbols_fd NEW: GNU ext.
5561 cacosf NEW: ISO C 9x
5562 cacosh NEW: ISO C 9x
5563 cacoshf NEW: ISO C 9x
5564 cacoshl NEW: ISO C 9x
5565 cacosl NEW: ISO C 9x
5572 casinf NEW: ISO C 9x
5573 casinh NEW: ISO C 9x
5574 casinhf NEW: ISO C 9x
5575 casinhl NEW: ISO C 9x
5576 casinl NEW: ISO C 9x
5578 catanf NEW: ISO C 9x
5579 catanh NEW: ISO C 9x
5580 catanhf NEW: ISO C 9x
5581 catanhl NEW: ISO C 9x
5582 catanl NEW: ISO C 9x
5583 cbc_crypt NEW: Secure RPC
5587 ccoshf NEW: ISO C 9x
5588 ccoshl NEW: ISO C 9x
5594 cimagf NEW: ISO C 9x
5595 cimagl NEW: ISO C 9x
5596 clearerr_locked REMOVED
5597 clntunix_create NEW: sunrpc ext
5599 clog10 NEW: ISO C 9x
5600 clog10f NEW: ISO C 9x
5601 clog10l NEW: ISO C 9x
5611 cprojf NEW: ISO C 9x
5612 cprojl NEW: ISO C 9x
5614 crealf NEW: ISO C 9x
5615 creall NEW: ISO C 9x
5620 csinhf NEW: ISO C 9x
5621 csinhl NEW: ISO C 9x
5624 csqrtf NEW: ISO C 9x
5625 csqrtl NEW: ISO C 9x
5629 ctanhf NEW: ISO C 9x
5630 ctanhl NEW: ISO C 9x
5632 des_setparity NEW: Secure RPC
5633 ecb_crypt NEW: Secure RPC
5634 endutxent NEW: Unix98
5636 exp10f NEW: ISO C 9x
5637 exp10l NEW: ISO C 9x
5641 fattach NEW: STREAMS
5642 fdetach NEW: STREAMS
5646 feclearexcept NEW: ISO C 9x
5647 fegetenv NEW: ISO C 9x
5648 fegetexceptflag NEW: ISO C 9x
5649 fegetround NEW: ISO C 9x
5650 feholdexcept NEW: ISO C 9x
5652 feraiseexcept NEW: ISO C 9x
5653 ferror_locked REMOVED
5654 fesetenv NEW: ISO C 9x
5655 fesetexceptflag NEW: ISO C 9x
5656 fesetround NEW: ISO C 9x
5657 fetestexcept NEW: ISO C 9x
5658 feupdateenv NEW: ISO C 9x
5659 fflush_locked REMOVED
5663 fgets_unlocked NEW: GNU ext.
5664 fileno_locked REMOVED
5676 fputc_locked REMOVED
5677 fputs_unlocked NEW: GNU ext.
5678 fread_unlocked NEW: GNU ext.
5683 fstatvfs NEW: Unix98
5687 ftruncate64 NEW: LFS
5689 fwrite_unlocked NEW: GNU ext.
5690 gai_strerror NEW: IPv6
5694 getchar_locked REMOVED
5696 getdate_err NEW: Unix98
5697 getdate_r NEW: GNU ext.
5699 getnameinfo NEW: IPv6
5700 getnetname NEW: Secure RPC
5701 getpmsg NEW: STREAMS
5702 getpt NEW: Unix98 PTY
5703 getrlimit64 NEW: LFS
5704 getutxent NEW: Unix98
5705 getutxid NEW: Unix98
5706 getutxline NEW: Unix98
5707 glob64 NEW: GNU ext.
5708 globfree64 NEW: GNU ext.
5709 gnu_get_libc_release NEW: GNU ext.
5710 gnu_get_libc_version NEW: GNU ext.
5711 grantpt NEW: Unix98 PTY
5712 host2netname NEW: Secure RPC
5714 iconv_close NEW: iconv
5715 iconv_open NEW: iconv
5716 if_freenameindex NEW: IPv6
5717 if_indextoname NEW: IPv6
5718 if_nameindex NEW: IPv6
5719 if_nametoindex NEW: IPv6
5720 in6addr_any NEW: IPv6
5721 in6addr_loopback NEW: IPv6
5722 inet6_isipv4mapped NEW: IPv6
5723 isastream NEW: STREAMS
5724 iswblank NEW: GNU ext.
5725 key_decryptsession NEW: Secure RPC
5726 key_decryptsession_pk NEW: Secure RPC
5727 key_encryptsession NEW: Secure RPC
5728 key_encryptsession_pk NEW: Secure RPC
5729 key_gendes NEW: Secure RPC
5730 key_get_conv NEW: Secure RPC
5731 key_secretkey_is_set NEW: Secure RPC
5732 key_setnet NEW: Secure RPC
5733 key_setsecret NEW: Secure RPC
5734 llrint NEW: ISO C 9x
5735 llrintf NEW: ISO C 9x
5736 llrintl NEW: ISO C 9x
5737 llround NEW: ISO C 9x
5738 llroundf NEW: ISO C 9x
5739 llroundl NEW: ISO C 9x
5744 lrintf NEW: ISO C 9x
5745 lrintl NEW: ISO C 9x
5746 lround NEW: ISO C 9x
5747 lroundf NEW: ISO C 9x
5748 lroundl NEW: ISO C 9x
5750 makecontext NEW: Unix98
5751 mempcpy NEW: GNU ext.
5754 modify_ldt NEW: kernel
5758 nearbyint NEW: ISO C 9x
5759 nearbyintf NEW: ISO C 9x
5760 nearbyintl NEW: ISO C 9x
5761 netname2host NEW: Secure RPC
5762 netname2user NEW: Secure RPC
5763 nexttoward NEW: ISO C 9x
5764 nexttowardf NEW: ISO C 9x
5765 nexttowardl NEW: ISO C 9x
5769 passwd2des NEW: Secure RPC
5771 pow10f NEW: GNU ext.
5772 pow10l NEW: GNU ext.
5775 printf_size NEW: GNU ext.
5776 printf_size_info NEW: GNU ext.
5777 profil_counter REMOVED
5778 pthread_mutexattr_getkind_np REPLACED
5779 pthread_mutexattr_setkind_np REPLACED
5780 ptsname NEW: Unix98 PTY
5781 ptsname_r NEW: Unix98 PTY
5783 putchar_locked REMOVED
5784 putgrent NEW: GNU ext.
5786 putpmsg NEW: STREAMS
5787 pututxline NEW: Unix98
5791 readdir64_r NEW: LFS
5792 remquo NEW: ISO C 9x
5793 remquof NEW: ISO C 9x
5794 remquol NEW: ISO C 9x
5796 roundf NEW: ISO C 9x
5797 roundl NEW: ISO C 9x
5799 scalbln NEW: ISO C 9x
5800 scalblnf NEW: ISO C 9x
5801 scalblnl NEW: ISO C 9x
5803 sendfile NEW: kernel
5804 setcontext NEW: Unix98
5805 setrlimit64 NEW: LFS
5806 setutxent NEW: Unix98
5808 sigignore NEW: Unix98
5809 sigqueue NEW: POSIX.1b
5810 sigrelse NEW: Unix98
5811 sigset NEW: POSIX.1b
5812 sigtimedwait NEW: POSIX.1b
5813 sigwaitinfo NEW: POSIX.1b
5814 sincos NEW: GNU ext.
5815 sincosf NEW: GNU ext.
5816 sincosl NEW: GNU ext.
5820 strcasestr NEW: GNU ext.
5821 strtoimax NEW: ISO C 9x
5822 strtoumax NEW: ISO C 9x
5823 strverscmp NEW: GNU ext.
5824 svcauthdes_stats NEW: Secure RPC
5825 svcunix_create NEW: sunrpc etx
5826 svcunixfd_create NEW: sunrpc ext
5827 swapcontext NEW: Unix98
5828 tcgetsid NEW: Unix98 PTY
5829 tdestroy NEW: GNU ext.
5830 tgamma NEW: ISO C 9x
5831 tgammaf NEW: ISO C 9x
5832 tgammal NEW: ISO C 9x
5836 truncf NEW: ISO C 9x
5837 truncl NEW: ISO C 9x
5839 unlockpt NEW: Unix98 PTY
5840 updwtmpx NEW: Unix98
5841 user2netname NEW: Secure RPC
5842 utmpxname NEW: Unix98
5843 versionsort NEW: GNU ext.
5844 versionsort64 NEW: GNU ext.
5846 wcscasecmp NEW: GNU ext.
5847 wcsncasecmp NEW: GNU ext.
5848 wcsnlen NEW: GNU ext.
5849 wcstoimax NEW: ISO C 9x
5850 wcstoll NEW: ISO C 9x
5851 wcstoull NEW: ISO C 9x
5852 wcstoumax NEW: ISO C 9x
5854 wordexp NEW: POSIX.2
5855 wordfree NEW: POSIX.2
5856 write_profiling REMOVED
5857 xdecrypt NEW: Secure RPC
5858 xdr_authdes_cred NEW: Secure RPC
5859 xdr_authdes_verf NEW: Secure RPC
5860 xdr_cryptkeyarg NEW: Secure RPC
5861 xdr_cryptkeyarg2 NEW: Secure RPC
5862 xdr_cryptkeyres NEW: Secure RPC
5863 xdr_getcredres NEW: Secure RPC
5864 xdr_key_netstarg NEW: Secure RPC
5865 xdr_key_netstres NEW: Secure RPC
5866 xdr_keybuf NEW: Secure RPC
5867 xdr_keystatus NEW: Secure RPC
5868 xdr_netnamestr NEW: Secure RPC
5869 xdr_sizeof NEW: Secure RPC
5870 xdr_unixcred NEW: sunrpc ext
5871 xencrypt NEW: Secure RPC
5872 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5883 * inet_ntoa is thread-safe
5885 * updwtmp is moved from libutil to libc
5887 * rewrite of cbrt function
5889 * update of timezone data
5903 * add atoll function
5905 * fix complex problems in Berkeley DB code
5907 * fix math functions
5911 * fixed lots of header problems (especially Linux/GNU specific)
5913 * dynamic loader preserves all registers
5915 * Roland McGrath provided support for handling of auxiliary objects in
5916 the ELF dynamic loader.
5918 * support for parallel builds is improved
5922 * GNU extensions are no longer declared by default. To enable them you
5923 must define the macro `_GNU_SOURCE' in your program or compile with
5926 * The library has changed from using GNU ld symbol aliases to using weak
5927 symbols where available. The ELF object file format supports weak
5928 symbols; GNU ld also supports weak symbols in the a.out format. (There
5929 is also now support for other GNU ld extensions in ELF. Use the
5930 `--with-elf' option to configure to indicate you have ELF, and
5931 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5932 of many files which contained only symbol aliases, reducing the size of
5933 the source and the compiled library; many other files were renamed to
5934 less cryptic names previously occupied by the symbol alias files.
5935 There is a new header file <elf.h> for programs which operate on
5936 files in the ELF format.
5938 * Converted to Autoconf version 2, so `configure' has more options.
5939 Run `configure --help' to see the details.
5941 * The library can now be configured to build profiling, highly-optimized
5942 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5943 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5944 `configure' enable building these extra libraries. The shared library is
5945 built by default when using both ELF and GNU ld. When shared libraries
5946 are enabled, the new library `-ldl' is available for arbitrary run-time
5947 loading of shared objects; its interface is defined in <dlfcn.h>. The
5948 new header file <link.h> gives access to the internals of the run-time
5949 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5950 application of same name on other systems and it provides information
5951 about dynamically linked binaries.
5953 * The C library now provides the run-time support code for profiling
5954 executables compiled with `-pg'. Programs can control the profiling code
5955 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5956 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5957 the support for this file format was contributed by David Mosberger-Tang.
5959 * The math code has been replaced with a math library based on fdlibm from
5960 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5961 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5962 functions. The math functions now reside in a separate library, so
5963 programs using them will need to use `-lm' their linking commands.
5965 * John C. Bowman contributed optimized ix87 assembler inline functions.
5967 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5968 mechanism similar to that found in Solaris 2. This is now used for the
5969 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5970 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5971 file controls what services are used for each individual database. This
5972 works by loading shared libraries with names specified in `nsswitch.conf',
5973 so service modules can be changed or added at any time without even
5974 relinking any program. Currently there are the file, db, and NIS based
5975 NSS services available.
5977 * The new functions `strtoq' and `strtouq' parse integer values from
5978 strings, like `strtol' and `strtoul', but they return `long long int' and
5979 `unsigned long long int' values, respectively (64-bit quantities).
5981 * The new functions `strtof' and `strtold' parse floating-point values from
5982 strings, like `strtod', but they return `float' and `long double' values,
5983 respectively (on some machines `double' and `long double' are the same).
5985 * Ulrich Drepper has contributed new implementations of the floating-point
5986 printing and reading code used in the `printf' family of functions and
5987 `strtod', `strtof', and `strtold'. These new functions are perfectly
5988 accurate, and much faster than the old ones.
5990 * The implementation of the POSIX locale model was completely rewritten by
5991 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5992 to compile the POSIX locale definition.
5994 * The former dummy implementations of the strcoll and strxfrm function are
5995 now replaced by fully functional code contributed by Ulrich Drepper. The
5996 collation information comes from the POSIX locale definitions.
5998 * The new header <langinfo.h> defines an interface for accessing
5999 various locale-dependent data (using the locale chosen with `setlocale').
6001 * Ulrich Drepper has contributed a new suite of functions for operation on
6002 wide-character and multibyte-character strings, in <wchar.h>;
6003 and classification and case conversion of wide characters, in <wctype.h>.
6004 These new functions are conforming to the ISO C, Amendement 1 specification.
6006 * There is now a second implementation of the standard I/O library available.
6007 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6008 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6010 * You can now use positional parameter specifications in format strings
6011 for the `printf' and `scanf' families of functions. For example,
6012 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6013 ``Number 6, Mr Jones''. This is mainly useful when providing different
6014 format strings for different languages, whose grammars may dictate
6015 different orderings of the values being printed. To support this
6016 feature, the interface for `register_printf_handler' has changed; see
6017 the header file <printf.h> for details.
6019 * The `printf' and `scanf' families of functions now understand a new
6020 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6021 to group numbers as indicated by the locale; for `scanf' and friends, this
6022 says to accept as valid only a number with all the proper grouping
6023 separators in the right places. In the default "C" locale, numbers are
6024 not grouped; but locales for specific countries will define the usual
6025 conventions (i.e. separate thousands with `,' in the US locale).
6027 * The pgrp functions have been regularized, slightly incompatibly but much
6028 less confusingly. The core functions are now `getpgid' and `setpgid',
6029 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6030 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6031 provided for compatibility. There is no longer an incompatible `getpgrp'
6032 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6034 * The new header file <fts.h> and suite of functions simplify programs that
6035 operate on directory trees. This code comes from 4.4 BSD.
6037 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6038 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6039 NSS scheme used in glibc.
6041 * There is a new malloc debugging hook `__memalign_hook'.
6043 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6044 `unsigned int' in <sys/types.h>. These are for compatibility only and
6045 their use is discouraged.
6047 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6048 done differently, so that it works even without GNU ld.
6050 * New function `euidaccess' checks allowed access to a file like `access',
6051 but using the effective IDs instead of the real IDs.
6053 * The time zone data files have been updated for the latest and greatest
6054 local time conventions of the countries of the world.
6056 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6059 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6060 for formatting floating-point numbers. They are provided only for
6061 compatibility; new programs should use `sprintf' instead. There are
6062 also equivalent function for the `long double' floating-point type and
6063 all functions also exist in a reentrant form.
6065 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6066 functions for maintaining the login-record files (primarily of use to
6067 system programs such as `login'), and convenient functions for
6068 allocating and initializing a pseudo-terminal (pty) device.
6070 * Ulrich Drepper has contributed new support for System V style
6071 shared memory and IPC on systems that support it.
6073 * Ulrich Drepper has contributed several miscellaneous new functions found
6074 in System V: The `hsearch' family of functions provide an effective
6075 implementation of hash tables; `a64l' and `l64a' provide a very simple
6076 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6079 * Ulrich Drepper has contributed new reentrant counterparts for the
6080 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6082 * Ulrich Drepper has contributed new, highly-optimized versions of several
6083 string functions for the i486/Pentium family of processors.
6085 * Ulrich Drepper has updated the Linux-specific code, based largely
6086 on work done in Hongjiu Lu's version of GNU libc for Linux.
6087 The GNU library now supports Linux versions 2.0.10 and later,
6088 using the ELF object file format (i[3456]86-*-linux).
6090 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6092 * David Mosberger-Tang and Richard Henderson have ported the C library
6093 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6094 dynamic linking support for ELF/Alpha.
6096 * Richard Henderson contributed several Alpha optimized assembler function
6097 for arithmetic and string handling.
6099 * Ulrich Drepper has contributed a new set of message catalog functions to
6100 support multiple languages using the <libintl.h> interface, for use with
6101 his new package GNU gettext. Translation volunteers have contributed
6102 catalogs of the library's messages in Spanish, German, and Korean.
6104 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6105 program and the `catgets' function for reading the catalog files it
6106 creates. (The <libintl.h> interface is preferred; we include the
6107 <nl_types.h> interface using `catgets' only for source compatibility with
6108 programs already written to use it.)
6110 * New header file <values.h> gives SVID-compatible names for <limits.h>
6113 * Various new macros, declarations, and small header files for compatibility
6116 * New function `group_member' is a convenient way to check if a process has
6117 a given effective group ID.
6119 * When using GCC 2.7 and later, the socket functions are now declared in a
6120 special way so that passing an argument of type `struct sockaddr_in *',
6121 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6122 `struct sockaddr *' type, does not generate a type-clash warning.
6124 * New function `error' declared in header file <error.h> is a convenient
6125 function for printing error messages and optionally exiting; this is the
6126 canonical function used in GNU programs. The new functions `err', `warn',
6127 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6128 doing the same thing.
6130 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6131 POSIX.2 `glob' function to do ~ and {...} expansion.
6133 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6134 `clearenv' which is used in POSIX.9 is also available.
6136 * New function `getsid' returns session ID number on systems that support it.
6138 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6139 files <db.h> and <mpool.h> provide a rich set of functions for several
6140 types of simple databases stored in memory and in files, and <ndbm.h> is
6141 an old `ndbm'-compatible interface using the `db' functions. Link with
6142 `-ldb' to get these functions.
6144 * New macro `strdupa' copies a string like `strdup', but uses local stack
6145 space from `alloca' instead of dynamic heap space from `malloc'.
6147 * New function `strnlen' is like `strlen' but searches only a given maximum
6148 number of characters for the null terminator. `stpncpy', `strndup' and
6149 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6152 * New function `statfs' in header <sys/statfs.h>.
6154 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6155 provide convenient functions for operating on blocks of null-terminated
6158 * A new suite of functions in <utmp.h> handle all the details of reading
6159 and writing the utmp file.
6161 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6164 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6165 completely POSIX compliant and also implemented the extended functionality
6166 to handle alternate digit representation and alternate era date formats.
6168 * Ulrich Drepper provided an implementation of the `strptime' function
6169 defined in XPG4.2 which transforms a string into a `struct tm' value.
6171 * Paul Eggert provided the tzselect shell script as part of the timezone
6172 code. The shell script makes it easy to select the correct timezone
6175 * The implementation of the malloc family of functions is completely replaced
6176 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6177 The implementation uses the mmap function (if available) and it is
6178 optimized for the use in multi threaded programs.
6180 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6181 functions. This new functionality is usable by specifying a special
6182 salt string and it is compatible with implementation on *BSD systems.
6184 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6185 `getsubopt' to handle second level command line options, `bsd_signal'
6186 to access BSD style `signal' functionality, the obsolete `regexp' style
6189 * the `lchown' function is available on system which support this
6192 * The implementation of the shadow password handling function was contributed
6195 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6197 * POSIX.1g support was added. The <sys/select.h> header is available,
6198 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6199 implementation of `getaddrinfo'.
6203 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6205 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6206 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6208 * The new function `daemon' from 4.4 BSD is useful for server programs that
6209 want to put themselves in the background.
6211 * Joel Sherrill has contributed support for several standalone boards that
6212 run without an operating system.
6214 * `printf', `scanf' and friends now accept a `q' type modifier for long
6215 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6217 * All of the code taken from BSD (notably most of the math and networking
6218 routines) has been updated from the BSD 4.4-Lite release.
6220 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6222 * The new functions `getdomainname' and `setdomainname' fetch or change the
6223 YP/NIS domain name. These are system calls which exist on systems which
6226 * The time zone data files have been updated for the latest international
6229 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6230 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6234 * The C library now includes support for Sun RPC, from Sun's free
6235 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6236 are included. (There is still no support for YP.)
6238 * Tom Quinn has contributed a port of the C library to SGI machines running
6239 Irix 4 (mips-sgi-irix4).
6241 * The new `lockf' function is a simplified interface to the locking
6242 facilities of `fcntl', included for compatibility.
6244 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6246 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6248 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6251 * The error message printed by `assert' for a failed assertion now includes
6252 the name of the program (if using GNU ld) and the name of the calling
6253 function (with versions of GCC that support this).
6255 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6257 * The library now includes the <sys/mman.h> header file and memory
6258 management functions `mmap', `munmap', `mprotect', `msync', and
6259 `madvise', on systems that support those facilities.
6261 * The interface for `mcheck' has changed slightly: the function called to
6262 abort the program when an allocation inconsistency is detected now takes
6263 an argument that indicates the type of failure. The new function
6264 `mprobe' lets you request a consistency check for a particular block at
6265 any time (checks are normally done only when you call `free' or `realloc'
6268 * It is now possible to easily cross-compile the C library, building on one
6269 system a library to run on another machine and/or operating system. All
6270 you need to do is set the variable `HOST_CC' in `configparms' to the
6271 native compiler for programs to run on the machine you are building on (a
6272 few generator programs are used on Unix systems); set `CC' to the
6275 * The new function `fexecve' (only implemented on the GNU system) executes
6276 a program file given a file descriptor already open on the file.
6280 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6281 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6283 * You can set the variable `libprefix' in `configparms' to specify a prefix
6284 to be prepended to installed library files; this makes it easy to install
6285 the GNU C library to be linked as `-lgnuc' or whatever.
6287 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6288 copies a limited number of characters from a string, and returns the
6289 address of the last character written.
6291 * You no longer need to check for whether the installed `stddef.h' is
6292 compatible with the GNU C library. configure now checks for you.
6294 * You can now define a per-stream `fileno' function to convert the
6295 stream's cookie into an integral file descriptor.
6297 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6298 allocates zero bytes of storage, and returns a unique pointer which
6299 you can pass to `realloc' or `free'. The behavior is undefined if
6300 you dereference this pointer.
6302 * The C library now runs on Sony NEWS m68k machines running either
6303 NewsOS 3 or NewsOS 4.
6305 * The new `syscall' function is a system-dependent primitive function
6306 for invoking system calls. It has the canonical behavior on Unix
6307 systems, including unreliable return values for some calls (such as
6308 `pipe', `fork' and `getppid').
6310 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6311 to `EAGAIN', which is the preferred name. On systems whose kernels
6312 use two distinct codes, the C library now translates EWOULDBLOCK to
6313 EAGAIN in every system call function.
6317 * The GNU C Library Reference Manual is now distributed with the library.
6318 `make dvi' will produce a DVI file of the printed manual.
6319 `make info' will produce Info files that you can read on line using C-h i
6320 in Emacs or the `info' program.
6321 Please send comments on the manual to bug-glibc-manual@gnu.org.
6323 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6325 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6327 * Jason Merrill has contributed a port to the Sequent Symmetry running
6328 Dynix version 3 (i386-sequent-dynix).
6330 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6331 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6333 * New function `memory_warnings' lets you arrange to get warnings when
6334 malloc is running out of memory to allocate, like Emacs gives you.
6336 * The C library now contains the relocating allocator used in Emacs 19 for
6337 its editing buffers. This allocator (ralloc) minimizes allocation
6338 overhead and fragmentation by moving allocated regions around whenever it
6339 needs to. You always refer to a ralloc'd region with a "handle" (a
6340 pointer to a pointer--an object of type `void **').
6342 * There is a new `printf' format: `%m' gives you the string corresponding
6343 to the error code in `errno'.
6345 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6346 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6347 pass, the `a' modifier says to fill in a `char **' you pass with a
6350 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6351 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6352 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6354 * `mkstemp' is a traditional Unix function to atomically create and open a
6355 uniquely-named temporary file.
6359 * The standard location for the file that says what the local timezone is
6360 has changed again. It is now `/usr/local/etc/localtime' (or more
6361 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6363 * The distribution no longer contains any files with names longer than 14
6366 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6367 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6369 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6373 * The configuration process has changed quite a bit. The `configure'
6374 script is now used just like the configuration scripts for other GNU
6375 packages. The `sysdeps' directory hierarchy is much rearranged.
6376 The file `INSTALL' explains the new scheme in detail.
6378 * The header files no longer need to be processed into ANSI C and
6379 traditional C versions. There is just one set of files to install, and
6380 it will work with ANSI or old C compilers (including `gcc -traditional').
6382 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6383 MIPS DECStation running Ultrix 4.
6385 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6386 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6387 made itself into a shared library.
6389 * Yet further improved support for the i386, running 4.3 BSD-like systems
6390 (such as Mach 3 with the Unix single-server), or System V.
6392 * New function `strncasecmp' to do case-insensitive string comparison
6393 with limited length.
6395 * New function `strsep' is a reentrant alternative to `strtok'.
6397 * New functions `scandir' and `alphasort' for searching directories.
6399 * New function `setenv' is a better interface to `putenv'.
6401 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6402 function for traversing a directory tree.
6404 * The GNU obstack package is now also part of the C library.
6405 The new function `open_obstack_stream' creates a stdio stream that
6406 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6407 formatted output directly to an obstack.
6409 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6410 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6412 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6414 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6415 things to your strings.
6417 * There are some new test programs: test-fseek, testmb, and testrand.
6419 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6420 These ports are not finished, but are a good starting place for really
6421 supporting those systems.
6423 * `/etc/localtime' is now the standard location for the file that says what
6424 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6425 This follows the general principle that `/etc' is the place for all local
6426 configuration files.
6428 * The C library header files now use `extern "C"' when used by the C++
6429 compiler, so the C library should now work with C++ code.
6431 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6432 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6435 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6436 function which uses the `merge sort' algorithm, and is said to be
6437 significantly faster than the old GNU `qsort' function. Merge sort is
6438 now the standard `qsort' function. The new algorithm can require a lot
6439 of temporary storage; so, the old sorting function is called when the
6440 required storage is not available.
6442 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6443 provides the Unix `crypt' function, plus some other entry points.
6445 * The code and header files taken from 4.4 BSD have been updated with the
6446 latest files released from Berkeley.
6448 ----------------------------------------------------------------------
6451 Permission is granted to anyone to make or distribute verbatim copies
6452 of this document as received, in any medium, provided that the
6453 copyright notice and this permission notice are preserved,
6454 thus giving the recipient permission to redistribute in turn.
6456 Permission is granted to distribute modified versions
6457 of this document, or of portions of it,
6458 under the above conditions, provided also that they
6459 carry prominent notices stating who last changed them.
6462 version-control: never