1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2021 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _SC_SIGSTKSZ_SOURCE or
13 _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
14 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
15 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
17 * The dynamic linker implements the --list-diagnostics option, printing
18 a dump of information related to IFUNC resolver operation and
19 glibc-hwcaps subdirectory selection.
21 * On Linux, the function execveat has been added. It operates similar to
22 execve and it is is already used to implement fexecve without requiring
23 /proc to be mounted. However, different than fexecve, if the syscall is not
24 supported by the kernel an error is returned instead of trying a fallback.
26 * The ISO C2X function timespec_getres has been added.
28 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
29 C2X, is supported to enable declarations of functions defined in Annex F
30 of C2X. Those declarations are also enabled when
31 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
32 defined, and when _GNU_SOURCE is defined.
34 * On powerpc64*, glibc can now be compiled without scv support using the
35 --disable-scv configure option.
37 * Add support for 64-bit time_t on configurations like x86 where time_t
38 is traditionally 32-bit. Although time_t still defaults to 32-bit on
39 these configurations, this default may change in future versions.
40 This is enabled with the _TIME_BITS preprocessor set to 64 and only
41 supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is only
42 enabled for Linux and the full support requires a minimum version of 5.1.
44 * The main gconv-modules file in glibc now contains only a small set of
45 essential converter modules and the rest have been moved into a supplementary
46 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
47 in the same GCONV_PATH. Similarly, external converter modules directories
48 may have supplementary configuration files in a gconv-modules.d directory
49 with names ending with .conf to logically classify the converter modules in
52 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
53 to configure the size of the thread stack cache.
55 * The function _Fork has been added as an async-signal-safe fork replacement
56 since Austin Group issue 62 droped the async-signal-safe requirement for
57 fork (and it will be included in the future POSIX standard). The new _Fork
58 function does not run any atfork function neither resets any internal state
59 or lock (such as the malloc one), and only sets up a minimal state required
60 to call async-signal-safe functions (such as raise or execve). This function
61 is currently a GNU extension.
63 * On Linux, the close_range function has been added. It allows efficiently
64 closing a range of file descriptors on recent kernels (version 5.9).
66 * The function closefrom has been added. It closes all file descriptors
67 greater than given integer. This function is a GNU extension, although it
68 also present in other systems.
70 Deprecated and removed features, and other changes affecting compatibility:
72 * The function pthread_mutex_consistent_np has been deprecated; programs
73 should use the equivalent standard function pthread_mutex_consistent
76 * The function pthread_mutexattr_getrobust_np has been deprecated;
77 programs should use the equivalent standard function
78 pthread_mutexattr_getrobust instead.
80 * The function pthread_mutexattr_setrobust_np has been deprecated;
81 programs should use the equivalent standard function
82 pthread_mutexattr_setrobust instead.
84 * The function pthread_yield has been deprecated; programs should use
85 the equivalent standard function sched_yield instead.
87 * The pthread cancellation handler is now installed with SA_RESTART and
88 pthread_cancel will always send the internal SIGCANCEL on a cancellation
89 request. It should not be visible to application since the cancellation
90 handler should either act upon cancellation (if asynchronous cancellation
91 is enabled) or ignore the cancellation internal signal. However there are
92 buggy kernel interfaces (for instance some CIFS version) that could still
93 see spurious EINTR error when cancellation interrupts a blocking syscall.
95 * Previously, glibc installed its various shared objects under versioned
96 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
97 were provided as symbolic links. Starting with glibc 2.34, the shared
98 objects are installed under their ABI sonames directly, without
99 symbolic links. This increases compatibility with distribution
100 package managers that delete removed files late during the package
101 upgrade or downgrade process.
103 * The symbols mallwatch and tr_break are now deprecated and no longer used in
104 mtrace. Similar functionality can be achieved by using conditional
105 breakpoints within mtrace functions from within gdb.
107 Changes to build and runtime requirements:
109 * On Linux, the shm_open, sem_open, and related functions now expect the
110 file shared memory file system to be mounted at /dev/shm. These functions
111 no longer search among the system's mount points for a suitable
112 replacement if /dev/shm is not available.
114 Security related changes:
116 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
117 a request for netgroup lookup, may crash due to a double-free,
118 potentially resulting in degraded service or Denial of Service on the
119 local system. Reported by Chris Schanzle.
121 CVE-2021-33574: The mq_notify function has a potential use-after-free
122 issue when using a notification type of SIGEV_THREAD and a thread
123 attribute with a non-default affinity mask.
125 The following bugs are resolved with this release:
127 [The release manager will add the list generated by
128 scripts/list-fixed-bugs.py just before the release.]
135 * The dynamic linker accepts the --list-tunables argument which prints
136 all the supported tunables. This option is disable if glibc is
137 configured with tunables disabled (--enable-tunables=no).
139 * The dynamic linker accepts the --argv0 argument and provides opportunity
140 to change argv[0] string.
142 * The dynamic linker loads optimized implementations of shared objects
143 from subdirectories under the glibc-hwcaps directory on the library
144 search path if the system's capabilities meet the requirements for
145 that subdirectory. Initially supported subdirectories include
146 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
147 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
148 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
149 subdirectory names correspond to the vendor-independent x86-64
150 microarchitecture levels defined in the x86-64 psABI supplement.
152 * The new --help option of the dynamic linker provides usage and
153 information and library search path diagnostics.
155 * The mallinfo2 function is added to report statistics as per mallinfo,
156 but with larger field widths to accurately report values that are
157 larger than fit in an integer.
159 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
161 * Support for the RISC-V ISA running on Linux has been expanded to run on
162 32-bit hardware. This is supported for the following ISA and ABI pairs:
168 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
171 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
172 glibc may use additional checks that may have an additional performance
173 overhead. At present these checks are available only on LLVM 9 and later.
174 The latest GCC available at this time (10.2) does not support this level of
177 Deprecated and removed features, and other changes affecting compatibility:
179 * The mallinfo function is marked deprecated. Callers should call
182 * When dlopen is used in statically linked programs, alternative library
183 implementations from HWCAP subdirectories are no longer loaded.
184 Instead, the default implementation is used.
186 * The deprecated <sys/vtimes.h> header and the function vtimes have been
187 removed. To support old binaries, the vtimes function continues to exist
188 as a compatibility symbol. Applications should use the getrlimit or
191 * Following a change in the tzdata 2018a release upstream, the zdump
192 program is now installed in the /usr/bin subdirectory. Previously,
193 the /usr/sbin subdirectory was used.
195 * On s390(x), the type float_t is now derived from the macro
196 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
197 hardcoded to double. This does not affect the ABI of any libraries
198 that are part of the GNU C Library, but may affect the ABI of other
199 libraries that use this type in their interfaces. The new definition
200 improves consistency with compiler behavior in many scenarios.
202 * A future version of glibc will stop loading shared objects from the
203 "tls" subdirectories on the library search path, the subdirectory that
204 corresponds to the AT_PLATFORM system name, and also stop employing
205 the legacy AT_HWCAP search mechanism. Applications should switch to
206 the new glibc-hwcaps mechanism instead; if they do not do that, only
207 the baseline version (directly from the search path directory) will be
210 Changes to build and runtime requirements:
212 * On Linux, the system administrator needs to configure /dev/pts with
213 the intended access modes for pseudo-terminals. glibc no longer
214 attemps to adjust permissions of terminal devices. The previous glibc
215 defaults ("tty" group, user read/write and group write) already
216 corresponded to what most systems used, so that grantpt did not
217 perform any adjustments.
219 * On Linux, the posix_openpt and getpt functions no longer attempt to
220 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
221 (and pseudo-terminals are supported), a devpts file system is mounted
222 on /dev/pts. Current systems already meet these requirements.
224 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
226 Security related changes:
228 CVE-2021-3326: An assertion failure during conversion from the
229 ISO-20220-JP-3 character set using the iconv function has been fixed.
230 This assertion was triggered by certain valid inputs in which the
231 converted output contains a combined sequence of two wide characters
232 crossing a buffer boundary. Reported by Tavis Ormandy.
234 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
235 invoked with input containing redundant shift sequences in the IBM1364,
236 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
238 CVE-2020-29562: An assertion failure has been fixed in the iconv function
239 when invoked with UCS4 input containing an invalid character.
241 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
242 invoked with EUC-KR input containing invalid multibyte input sequences.
244 The following bugs are resolved with this release:
246 [10635] libc: realpath portability patches
247 [16124] dynamic-link: ld.so should allow to change argv[0]
248 [17924] malloc: 'free' should not set errno
249 [18683] libc: Linux faccessat implementation can incorrectly ignore
251 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
252 [23091] hurd: missing waitid support
253 [23249] libc: Epyc and other current AMD CPUs do not select the
254 "haswell" platform subdirectory
255 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
257 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
259 [24941] libc: Make grantpt usable after multi-threaded fork in more
261 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
262 [24973] locale: iconv encounters segmentation fault when converting
263 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
264 [25399] string: undefined reference to `__warn_memset_zero_len' when
265 changing gnuc version
266 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
268 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
270 [25971] libc: s390 bits/hwcap.h out of sync with kernel
271 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
272 [26100] libc: Race in syslog(3) with regards to tag printing.
273 [26124] libc: Export <cpu-features.h>
274 [26130] nscd: Inconsistent nscd cache during pruning
275 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
276 [26224] locale: iconv hangs when converting some invalid inputs from
277 several IBM character sets (CVE-2020-27618)
278 [26341] libc: realpath cyclically call __alloca(path_max) to consume
280 [26343] manual: invalid documented return type for strerrorname_np(),
281 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
282 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
284 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
286 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
287 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
289 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
290 [26553] libc: mtx_init allows type set to "mtx_recursive" only
291 [26555] string: strerrorname_np does not return the documented value
292 [26592] libc: pointer arithmetic overflows in realpath
293 [26600] network: Transaction ID collisions cause slow DNS lookups in
295 [26606] libc: [2.33 Regression] pselect is broken on x32
296 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
297 [26620] glob: fnmatch with collating symbols results in segmentation
299 [26625] libc: [2.33 Regression] CET is disabled
300 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
301 at the end of a memory mapping
302 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
303 by the caller to the kernel
304 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
305 [26647] build: [-Werror=array-parameter=] due to different
306 declarations for __sigsetjmp
307 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
309 [26649] stdio: printf should handle non-normal x86 long double numbers
310 gracefully (CVE-2020-29573)
311 [26686] build: -Warray-parameter instances building with GCC 11
312 [26687] build: -Warray-bounds instances building with GCC 11
313 [26690] stdio: Aliasing violation in __vfscanf_internal
314 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
315 [26726] build: GCC warning calling new_composite_name with an array of
317 [26736] libc: FAIL: misc/tst-sysvshm-linux
318 [26737] libc: Random FAIL: rt/tst-shm
319 [26791] libc: Missing O_CLOEXEC in sysconf.c
320 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
322 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
324 [26818] string: aarch64: string tests may run ifunc variants that are
326 [26821] libc: Memory leak test failures on Fedora 33
327 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
328 FSGSBASE/LM/RDRAND check failure
329 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
331 [26853] libc: aarch64: Missing unwind information in statically linked
333 [26923] locale: Assertion failure in iconv when converting invalid
334 UCS4 (CVE-2020-29562)
335 [26926] dynamic-link: aarch64: library dependencies are not bti
337 [26932] libc: sh: Multiple floating point functions defined as stubs
339 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
341 [26988] dynamic-link: aarch64: BTI mprotect address is not page
343 [27002] build: libc_freeres_fn build failure with GCC 11
344 [27004] dynamic-link: ld.so is miscompiled by GCC 11
345 [27008] dynamic-link: ld.so.cache should have endianness markup
346 [27042] libc: [alpha] anonymous union in struct stat confuses
348 [27053] libc: Conformance regression in system(3) (and probably also
350 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
352 [27077] network: Do not reload /etc/nsswitch.conf from chroot
353 [27083] libc: Unsafe unbounded alloca in addmntent
354 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
356 [27130] string: "rep movsb" performance issue
357 [27150] libc: alpha: wait4() is unavailable in static linking
358 [27177] dynamic-link:
359 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
361 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
362 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
363 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
364 related to combining characters (CVE-2021-3326)
371 * Unicode 13.0.0 Support: Character encoding, character type info, and
372 transliteration tables are all updated to Unicode 13.0.0, using
373 generator scripts contributed by Mike FABIAN (Red Hat).
375 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
377 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
378 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
379 Three ABIs are supported:
385 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
386 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
388 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
389 DT_DEPAUDIT dynamic section entries of the main executable.
391 * powerpc64le supports IEEE128 long double libm/libc redirects when
392 using -mabi=ieeelongdouble to compile C code on supported GCC
393 toolchains. It is recommended to use GCC 8 or newer when testing
396 * To help detect buffer overflows and other out-of-bounds accesses
397 several APIs have been annotated with GCC 'access' attribute. This
398 should help GCC 10 issue better warnings.
400 * On Linux, functions pthread_attr_setsigmask_np and
401 pthread_attr_getsigmask_np have been added. They allow applications
402 to specify the signal mask of a thread created with pthread_create.
404 * The GNU C Library now provides the header file <sys/single_threaded.h>
405 which declares the variable __libc_single_threaded. Applications are
406 encouraged to use this variable for single-thread optimizations,
407 instead of weak references to symbols historically defined in
410 * The functions sigabbrev_np and sigdescr_np have been added. The
411 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
412 SIGHUP) while sigdescr_np returns a string describing the signal number
413 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
414 attempt to translate the return description, both functions return
415 NULL for an invalid signal number.
417 They should be used instead of sys_siglist or sys_sigabbrev and they
418 are both thread and async-signal safe. These functions are GNU extensions.
420 * The functions strerrorname_np and strerrordesc_np have been added. The
421 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
422 while strerrordesc_np returns a string describing the error number
423 (e.g "Invalid argument" for EINVAL). Different than strerror,
424 strerrordesc_np does not attempt to translate the return description, both
425 functions return NULL for an invalid error number.
427 They should be used instead of sys_errlist and sys_nerr, both are
428 thread and async-signal safe. These functions are GNU extensions.
430 * AArch64 now supports standard branch protection security hardening
431 in glibc when it is built with a GCC that is configured with
432 --enable-standard-branch-protection (or if -mbranch-protection=standard
433 flag is passed when building both GCC target libraries and glibc,
434 in either case a custom GCC is needed). This includes branch target
435 identification (BTI) and pointer authentication for return addresses
436 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
437 extensions respectively for the protection to be effective,
438 otherwise the used instructions are nops. User code can use PAC-RET
439 without libc support, but BTI requires a libc that is built with BTI
440 support, otherwise runtime objects linked into user code will not be
443 Deprecated and removed features, and other changes affecting compatibility:
445 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
446 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
447 RPC header files. Backward compatibility for old programs is kept
448 only for architectures and ABIs that have been added in or before
449 glibc 2.31. New programs need to use TI-RPC
450 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
451 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
453 * Remove configure option --enable-obsolete-nsl. libnsl is only built
454 as shared library for backward compatibility and the NSS modules "nis"
455 and "nisplus" are not built at all and libnsl's headers aren't
456 installed. This compatibility is kept only for architectures and ABIs
457 that have been added in or before version 2.28. Replacement
458 implementations based on TI-RPC, which additionally support IPv6, are
459 available from <https://github.com/thkukuk/>. This change does not
460 affect the "compat" NSS module, which does not depend on libnsl
461 since 2.27 and thus can be used without NIS.
463 * The deprecated <sys/sysctl.h> header and the sysctl function have been
464 removed. To support old binaries, the sysctl function continues to
465 exist as a compatibility symbol (on those architectures which had it),
466 but always fails with ENOSYS. This reflects the removal of the system
467 call from all architectures, starting with Linux 5.5.
469 * The sstk function is no longer available to newly linked binaries.
470 Its implementation always returned with a failure, and the function
471 was not declared in any header file.
473 * The legacy signal handling functions siginterrupt, sigpause, sighold,
474 sigrelse, sigignore and sigset, and the sigmask macro have been
475 deprecated. Applications should use the sigsuspend, sigprocmask and
476 sigaction functions instead.
478 * ldconfig now defaults to the new format for ld.so.cache. glibc has
479 already supported this format for almost 20 years.
481 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
482 are no longer available to newly linked binaries, and their declarations
483 have been removed from <string.h>. They are exported solely as
484 compatibility symbols to support old binaries. All programs should use
487 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
488 are no longer available to newly linked binaries, and their declarations
489 have been removed from <stdio.h>. They are exported solely as
490 compatibility symbols to support old binaries. All programs should use
491 strerror or strerror_r instead.
493 * Both strerror and strerror_l now share the same internal buffer in the
494 calling thread, meaning that the returned string pointer may be invalided
495 or contents might be overwritten on subsequent calls in the same thread or
496 if the thread is terminated. It makes strerror MT-safe.
498 * Using weak references to libpthread functions such as pthread_create
499 or pthread_key_create to detect the singled-threaded nature of a
500 program is an obsolescent feature. Future versions of glibc will
501 define pthread_create within libc.so.6 itself, so such checks will
502 always flag the program as multi-threaded. Applications should check
503 the __libc_single_threaded variable declared in
504 <sys/single_threaded.h> instead.
506 * The "files" NSS module no longer supports the "key" database (used for
507 secure RPC). The contents of the /etc/publickey file will be ignored,
508 regardless of the settings in /etc/nsswitch.conf. (This method of
509 storing RPC keys only supported the obsolete and insecure AUTH_DES
510 flavor of secure RPC.)
512 * The __morecore and __after_morecore_hook malloc hooks and the default
513 implementation __default_morecore have been deprecated. Applications
514 should use malloc interposition to change malloc behavior, and mmap to
515 allocate anonymous memory. A future version of glibc may require that
516 applications which use the malloc hooks must preload a special shared
517 object, to enable the hooks.
519 * The hesiod NSS module has been deprecated and will be removed in a
520 future version of glibc. System administrators are encouraged to
521 switch to other approaches for networked account databases, such as
524 Changes to build and runtime requirements:
526 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
527 long double redirects.
529 Security related changes:
531 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
532 invoked with the -c option and when processing invalid multi-byte input
533 sequences. Reported by Jan Engelhardt.
535 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
536 corruption when they were passed a pseudo-zero argument. Reported by Guido
537 Vranken / ForAllSecure Mayhem.
539 CVE-2020-1752: A use-after-free vulnerability in the glob function when
540 expanding ~user has been fixed.
542 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
543 memmove functions has been fixed. Discovered by Jason Royes and Samual
544 Dytrych of the Cisco Security Assessment and Penetration Team (See
547 The following bugs are resolved with this release:
549 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
550 [10441] manual: Backtraces code example lacks error checking
551 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
552 timer_sigev_thread dangerous
553 [14231] stdio: stdio-common tests memory requirements
554 [14578] libc: /proc-based emulation for lchmod, fchmodat
555 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
556 filtee has constructor
557 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
558 sequences (CVE-2016-10228)
559 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
560 character entities for infinity & pi
561 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
562 segfaults in applications
563 [20543] libc: Please move from .gnu.linkonce to comdat
564 [22489] network: gcc warns about implicit convertion in
565 ICMP6_FILTER_SETPASS with -Wsign-conversion
566 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
567 [23294] math: Complex _FloatN functions are redirected to the wrong
568 function with -mlong-double-64
569 [23296] libc: Data race in setting function descriptor during lazy
571 [23668] dynamic-link: ldconfig: Default to the new format for
573 [23819] hurd: hurd: Add C11 thread support
574 [23990] build: test-container error out on failure to exec child.
575 [23991] build: shell-container typo in run_command_array
576 [24638] manual: Error in example of parsing a template string
577 [24654] manual: Wrong declaration of wcschr in libc manual
578 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
580 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
581 dynamically loaded dsos
582 [25098] nptl: nptl: ctype classification functions are not AS-Safe
583 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
585 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
586 restore EAX, ECX and EDX
587 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
588 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
589 [25420] network: Race condition in resolv_conf.c can result in caching
590 stale configuration forever
591 [25487] math: sinl() stack corruption from crafted input
593 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
595 [25523] libc: MIPS/Linux inline syscall template is miscompiled
596 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
598 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
599 on 32 bit and old kernel
600 [25635] libc: arm: Wrong sysdep order selection for soft-fp
601 [25639] localedata: Some names of days and months wrongly spelt in
603 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
604 amount of sigset_t bytes
605 [25691] stdio: printf: memory leak when printing long multibyte
607 [25715] libc: system() returns wrong errors when posix_spawn fails
608 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
609 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
610 state for conversions that produce two Unicode code points
611 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
612 for linux x86_64 leads to livelock
613 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
614 test failures, invalid instruction in ld.so
615 [25790] glob: Typo in tst-fnmatch.input
616 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
618 [25819] localedata: Update locale data to Unicode 13.0.0
619 [25824] libc: Abnormal function of strnlen in aarch64
620 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
621 [25896] libc: Incorrect prctl
622 [25902] libc: Bad LOADARGS_N
623 [25905] dynamic-link: VSX registers are corrupted during PLT
624 resolution when glibc is built with --disable-multi-arch and --with-
626 [25933] string: Off by one error in __strncmp_avx2 when
627 length=VEC_SIZE*4 and strings are at page boundaries can cause a
629 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
630 exiting detached thread
631 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
633 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
635 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
636 [26073] math: getpayload() has wrong return value
637 [26076] dynamic-link: dlmopen crashes after failing to load
638 dependencies in audit mode
639 [26120] localedata: column width of of some Korean
640 JUNGSEONG/JONGSEONG characters wrong (should be 0)
641 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
642 [26133] libc: Incorrect need_arch_feature_F16C
643 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
645 [26149] libc: PKU is usable only if OSPKE is set
646 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
648 [26208] libc: Incorrect bit_cpu_CLFSH
649 [26210] network: Incorrect use of hidden symbols for global sunrpc
651 [26211] stdio: printf integer overflow calculating allocation size
652 [26214] stdio: printf_fp double free
653 [26215] stdio: printf_fp memory leak
654 [26232] time: FAIL: support/tst-timespec for 32-bit targets
655 [26258] nss: nss_compat should not read input files with mmap
656 [26332] string: Incorrect cache line size load causes memory
664 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
665 enable features from the draft ISO C2X standard. Only some features from
666 this draft standard are supported by the GNU C Library, and as the draft
667 is under active development, the set of features enabled by this macro is
668 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
669 by compiling with "gcc -std=gnu2x".
671 * The <math.h> functions that round their results to a narrower type now
672 have corresponding type-generic macros in <tgmath.h>, as defined in TS
673 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
674 Clarification Request 13 to TS 18661-3.
676 * The function pthread_clockjoin_np has been added, enabling join with a
677 terminated thread with a specific clock. It allows waiting against
678 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
680 * New locale added: mnw_MM (Mon language spoken in Myanmar).
682 * The DNS stub resolver will optionally send the AD (authenticated data) bit
683 in queries if the trust-ad option is set via the options directive in
684 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
685 mode, the AD bit, as provided by the name server, is available to
686 applications which call res_search and related functions. In the default
687 mode, the AD bit is not set in queries, and it is automatically cleared in
688 responses, indicating a lack of DNSSEC validation. (Therefore, the name
689 servers and the network path to them are treated as untrusted.)
691 Deprecated and removed features, and other changes affecting compatibility:
693 * The totalorder and totalordermag functions, and the corresponding
694 functions for other floating-point types, now take pointer arguments to
695 avoid signaling NaNs possibly being converted to quiet NaNs in argument
696 passing. This is in accordance with the resolution of Clarification
697 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
698 floating-point arguments directly will continue to work.
700 * The obsolete function stime is no longer available to newly linked
701 binaries, and its declaration has been removed from <time.h>.
702 Programs that set the system time should use clock_settime instead.
704 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
705 in a future version of glibc. In this release, the header still exists
706 but calling ftime will cause a compiler warning. All programs should use
707 gettimeofday or clock_gettime instead.
709 * The gettimeofday function no longer reports information about a
710 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
711 many years, as it cannot handle the full complexity of the world's
712 timezones, but hitherto we have supported it on a best-effort basis.
713 Changes required to support 64-bit time_t on 32-bit architectures have
714 made this no longer practical.
716 As of this release, callers of gettimeofday with a non-null 'tzp' argument
717 should expect to receive a 'struct timezone' whose tz_minuteswest and
718 tz_dsttime fields are zero. (For efficiency reasons, this does not always
719 happen on a few Linux-based ports. This will be corrected in a future
722 All callers should supply a null pointer for the 'tzp' argument to
723 gettimeofday. For accurate information about the time zone associated
724 with the current time, use the localtime function.
726 gettimeofday itself is obsolescent according to POSIX. We have no plans
727 to remove access to this function, but portable programs should consider
728 using clock_gettime instead.
730 * The settimeofday function can still be used to set a system-wide time
731 zone when the operating system supports it. This is because the Linux
732 kernel reused the API, on some architectures, to describe a system-wide
733 time-zone-like offset between the software clock maintained by the kernel,
734 and the "RTC" clock that keeps time when the system is shut down.
736 However, to reduce the odds of this offset being set by accident,
737 settimeofday can no longer be used to set the time and the offset
738 simultaneously. If both of its two arguments are non-null, the call
739 will fail (setting errno to EINVAL).
741 Callers attempting to set this offset should also be prepared for the call
742 to fail and set errno to ENOSYS; this already happens on the Hurd and on
743 some Linux architectures. The Linux kernel maintainers are discussing a
744 more principled replacement for the reused API. After a replacement
745 becomes available, we will change settimeofday to fail with ENOSYS on all
746 platforms when its 'tzp' argument is not a null pointer.
748 settimeofday itself is obsolescent according to POSIX. Programs that set
749 the system time should use clock_settime and/or the adjtime family of
750 functions instead. We may cease to make settimeofday available to newly
751 linked binaries after there is a replacement for Linux's time-zone-like
754 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
755 the optional CAS instruction is implemented (for instance, LEON processors
756 are still supported, but SuperSPARC processors are not).
758 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
761 * If a lazy binding failure happens during dlopen, during the execution of
762 an ELF constructor, the process is now terminated. Previously, the
763 dynamic loader would return NULL from dlopen, with the lazy binding error
764 captured in a dlerror message. In general, this is unsafe because
765 resetting the stack in an arbitrary function call is not possible.
767 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
768 executable stack unless explicitly configured at build time to require
769 minimum kernel version 4.8 or newer. This is because executing
770 floating-point branches on a non-executable stack on Linux kernels prior to
771 4.8 can lead to application crashes for some MIPS configurations. While
772 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
773 expected to enable non-executable stack by default with PT_GNU_STACK by
774 default and is thus likely to trigger a crash on older kernels.
776 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
777 non-executable stack while dropping support for older kernels.
779 * System call wrappers for time system calls now use the new time64 system
780 calls when available. On 32-bit targets, these wrappers attempt to call
781 the new system calls first and fall back to the older 32-bit time system
782 calls if they are not present. This may cause issues in environments
783 that cannot handle unsupported system calls gracefully by returning
784 -ENOSYS. Seccomp sandboxes are affected by this issue.
786 Changes to build and runtime requirements:
788 * It is no longer necessary to have recent Linux kernel headers to build
789 working (non-stub) system call wrappers on all architectures except 64-bit
790 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
792 * The ChangeLog file is no longer present in the toplevel directory of the
793 source tree. ChangeLog files are located in the ChangeLog.old directory as
794 ChangeLog.N where the highest N has the latest entries.
796 Security related changes:
798 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
799 out-of-bounds write when executed in a signal frame context.
801 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
802 environment variable during program execution after a security
803 transition, allowing local attackers to restrict the possible mapping
804 addresses for loaded libraries and thus bypass ASLR for a setuid
805 program. Reported by Marcin Kościelnicki.
807 The following bugs are resolved with this release:
809 [12031] localedata: iconv -t ascii//translit with Greek characters
810 [15813] libc: Multiple issues in __gen_tempname
811 [17726] libc: [arm, sparc] profil_counter should be compat symbol
812 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
813 [19767] libc: vdso is not used with static linking
814 [19903] hurd: Shared mappings not being inherited by children processes
815 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
816 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
818 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
819 Symbols-A/B Unicode blocks
820 [23518] libc: Eliminate __libc_utmp_jump_table
821 [24026] malloc: malloc_info() returns wrong numbers
822 [24054] localedata: Many locales are missing date_fmt
823 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
824 [24304] dynamic-link: Lazy binding failure during ELF
825 constructors/destructors is not fatal
826 [24376] libc: RISC-V symbol size confusion with _start
827 [24682] localedata: zh_CN first weekday should be Monday per GB/T
829 [24824] libc: test-in-container does not install charmap files compatible
831 [24844] regex: regex bad pointer / leakage if malloc fails
832 [24867] malloc: Unintended malloc_info formatting changes
833 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
834 [24880] libc: login: utmp implementation uses struct flock with fcntl64
835 [24882] libc: login: pututline uses potentially outdated cache
836 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
837 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
839 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
841 [24930] dynamic-link: dlopen of PIE executable can result in
842 _dl_allocate_tls_init assertion failure
843 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
844 (stringop-overflow error)
845 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
846 functions other can lead to crashes
847 [24967] libc: jemalloc static linking causes runtime failure
848 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
850 [25035] libc: sbrk() failure handled poorly in tunables_strdup
851 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
852 [25097] libc: new -Warray-bounds with GCC 10
853 [25112] dynamic-link: dlopen must not make new objects accessible when it
854 still can fail with an error
855 [25139] localedata: Please add the new mnw_MM locale
856 [25149] regex: Array bounds violation in proceed_next_node
857 [25157] dynamic-link: Audit cookie for the dynamic loader is not
858 initialized correctly
859 [25189] libc: glibc's __glibc_has_include causes issues with clang
861 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
863 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
864 binaries (CVE-2019-19126)
865 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
867 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
869 [25232] string: <string.h> does not enable const correctness for strchr et
871 [25233] localedata: Consider "." as the thousands separator for sl_SI
873 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
874 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
875 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
877 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
878 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
880 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
881 (dl_initfirst) link map pointer
882 [25401] malloc: pvalloc must not have __attribute_alloc_size__
883 [25423] libc: Array overflow in backtrace on powerpc
884 [25425] network: Missing call to __resolv_context_put in
885 getaddrinfo.c:gethosts
892 * Unicode 12.1.0 Support: Character encoding, character type info, and
893 transliteration tables are all updated to Unicode 12.1.0, using
894 generator scripts contributed by Mike FABIAN (Red Hat).
896 * The dynamic linker accepts the --preload argument to preload shared
897 objects, in addition to the LD_PRELOAD environment variable.
899 * The twalk_r function has been added. It is similar to the existing
900 twalk function, but it passes an additional caller-supplied argument
901 to the callback function.
903 * On Linux, the getdents64, gettid, and tgkill functions have been added.
905 * Minguo (Republic of China) calendar support has been added as an
906 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
909 * The entry for the new Japanese era has been added for ja_JP locale.
911 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
912 pvalloc, memalign, and posix_memalign fail now with total object size
913 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
914 pointer subtraction within the allocated object, where results might
915 overflow the ptrdiff_t type.
917 * The dynamic linker no longer refuses to load objects which reference
918 versioned symbols whose implementation has moved to a different soname
919 since the object has been linked. The old error message, symbol
920 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
921 link time reference, is gone.
923 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
924 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
925 functions. These behave similarly to their "timed" equivalents, but also
926 accept a clockid_t parameter to determine which clock their timeout should
927 be measured against. All functions allow waiting against CLOCK_MONOTONIC
928 and CLOCK_REALTIME. The decision of which clock to be used is made at the
929 time of the wait (unlike with pthread_condattr_setclock, which requires
930 the clock choice at initialization time).
932 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
933 work, new resolvers can use a second argument which can be extended in
934 the future, currently it contains the AT_HWCAP2 value.
936 Deprecated and removed features, and other changes affecting compatibility:
938 * The copy_file_range function fails with ENOSYS if the kernel does not
939 support the system call of the same name. Previously, user space
940 emulation was performed, but its behavior did not match the kernel
941 behavior, which was deemed too confusing. Applications which use the
942 copy_file_range function can no longer rely on glibc to provide a fallback
943 on kernels that do not support the copy_file_range system call, and if
944 this function returns ENOSYS, they will need to use their own fallback.
945 Support for copy_file_range for most architectures was added in version
946 4.5 of the mainline Linux kernel.
948 * The functions clock_gettime, clock_getres, clock_settime,
949 clock_getcpuclockid, clock_nanosleep were removed from the librt library
950 for new applications (on architectures which had them). Instead, the
951 definitions in libc will be used automatically, which have been available
954 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
955 and <sys/stropts.h> have been removed.
957 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
958 resolver flag (deprecated in glibc 2.25) have been removed.
960 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
961 resolver have been removed from <resolv.h>.
963 * With --enable-bind-now, installed programs are now linked with the
966 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
967 configurations) has been removed, following the deprecation of this
968 subarchitecture in version 8 of GCC, and its removal in version 9.
970 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
971 header have been removed.
973 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
974 deprecated and will be removed from a future version of glibc.
975 Application should directly access /proc instead. For obtaining random
976 bits, the getentropy function can be used.
978 Changes to build and runtime requirements:
980 * GCC 6.2 or later is required to build the GNU C Library.
982 Older GCC versions and non-GNU compilers are still supported when
983 compiling programs that use the GNU C Library.
985 Security related changes:
987 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
988 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
989 has undefined behavior. On x32, the size_t argument may be passed
990 in the lower 32 bits of the 64-bit RDX register with non-zero upper
991 32 bits. When it happened with the sign bit of RDX register set,
992 memcmp gave the wrong result since it treated the size argument as
993 zero. Reported by H.J. Lu.
995 CVE-2019-9169: Attempted case-insensitive regular-expression match
996 via proceed_next_node in posix/regexec.c leads to heap-based buffer
997 over-read. Reported by Hongxu Chen.
999 The following bugs are resolved with this release:
1001 [2872] locale: Transliteration Cyrillic -> ASCII fails
1002 [6399] libc: gettid() should have a wrapper
1003 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1004 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1005 [17396] localedata: globbing for locale by [[.collating-element.]]
1006 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1007 [18465] malloc: memusagestat is built using system C library
1008 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1009 invalid input drops valid char
1010 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1011 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1012 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1013 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1014 [23352] malloc: __malloc_check_init still defined in public header
1016 [23403] nptl: Wrong alignment of TLS variables
1017 [23501] libc: nftw() doesn't return dangling symlink's inode
1018 [23733] malloc: Check the count before calling tcache_get()
1019 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1021 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1022 [23844] nptl: pthread_rwlock_trywrlock results in hang
1023 [23983] argparse: Missing compat versions of argp_failure and argp_error
1024 for long double = double
1025 [23984] libc: Missing compat versions of err.h and error.h functions for
1026 long double = double
1027 [23996] localedata: Dutch salutations
1028 [24040] libc: riscv64: unterminated call chain in __thread_start
1029 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1031 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1032 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1034 [24114] regex: regexec buffer read overrun in "grep -i
1035 '\(\(\)*.\)*\(\)\(\)\1'"
1036 [24122] libc: Segfaults if 0 returned from la_version
1037 [24153] stdio: Some input functions do not react to stdin assignment
1038 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1039 RDX is set) (CVE-2019-7309)
1040 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1041 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1042 not the default "nor"
1043 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1044 false positives, change to modern flexible array
1045 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1046 instructions while maintaining the robust mutex list due to missing
1048 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1049 unnecessary librt dependencies
1050 [24200] localedata: Revert first_weekday removal in en_IE locale
1051 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1052 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1053 [24216] malloc: Check for large bin list corruption when inserting
1055 [24228] stdio: old x86 applications that use legacy libio crash on exit
1056 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1058 [24293] localedata: Missing Minguo calendar support for TW locales
1059 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1060 tt_RU (Tatar) locale
1061 [24307] localedata: Update locale data to Unicode 12.0.0
1062 [24323] dynamic-link: dlopen should not be able open PIE objects
1063 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1064 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1065 tt_RU (Tatar) locale
1066 [24370] localedata: Add lang_name for tt_RU locale
1067 [24372] locale: Binary locale files are not architecture independent
1068 [24394] time: strptime %Ey mis-parses final year of era
1069 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1071 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1073 [24531] malloc: Malloc tunables give tcache assertion failures
1074 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1076 [24535] localedata: Update locale data to Unicode 12.1.0
1077 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1078 kernels and break testing
1079 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1080 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1081 [-Werror=format-overflow=]
1082 [24570] libc: alpha: compat msgctl uses __IPC_64
1083 [24584] locale: Data race in __wcsmbs_clone_conv
1084 [24588] stdio: Remove codecvt vtables from libio
1085 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1087 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1088 [24632] stdio: Old binaries which use freopen with default stdio handles
1090 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1092 [24652] localedata: szl_PL spelling correction
1093 [24695] nss: nss_db: calling getpwent after endpwent crashes
1094 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1095 in /etc/nsswitch.conf
1096 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1097 [24740] libc: getdents64 type confusion
1098 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1099 always implemented in the same library
1100 [24744] libc: Remove copy_file_range emulation
1101 [24757] malloc: memusagestat is linked against system libpthread
1102 [24794] libc: Partial test suite run builds corrupt test-in-container
1110 * The getcpu wrapper function has been added, which returns the currently
1111 used CPU and NUMA node. This function is Linux-specific.
1113 * A new convenience target has been added for distribution maintainers
1114 to build and install all locales as directories with files. The new
1115 target is run by issuing the following command in your build tree:
1116 'make localedata/install-locale-files', with an optional DESTDIR
1117 to set the install root if you wish to install into a non-default
1118 configured location.
1120 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1122 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1123 for _GNU_SOURCE, to match BSD environments.
1125 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1126 indicates that it will abort the transaction prior to entering the kernel
1127 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1128 suspended, and this caused some undefined side-effects issues by aborting
1129 transactions manually. Glibc avoided it by abort transactions manually on
1130 each syscall, but it lead to performance issues on newer kernels where the
1131 HTM state is saved and restore lazily (the state being saved even when the
1132 process actually does not use HTM).
1134 * The functions posix_spawn_file_actions_addchdir_np and
1135 posix_spawn_file_actions_addfchdir_np have been added, enabling
1136 posix_spawn and posix_spawnp to run the new process in a different
1137 directory. These functions are GNU extensions. The function
1138 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1141 * The popen and system do not run atfork handlers anymore (BZ#17490).
1142 Although it is a possible POSIX violation, the POSIX rationale in
1143 pthread_atfork documentation regarding atfork handlers is to handle
1144 inconsistent mutex state after a fork call in a multi-threaded process.
1145 In both popen and system there is no direct access to user-defined mutexes.
1147 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1148 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1150 - C-SKY ABIV2 soft-float little-endian
1151 - C-SKY ABIV2 hard-float little-endian
1153 * strftime's default formatting of a locale's alternative year (%Ey)
1154 has been changed to zero-pad the year to a minimum of two digits,
1155 like "%y". This improves the display of Japanese era years during
1156 the first nine years of a new era, and is expected to be harmless
1157 for all other locales (only Japanese locales regularly have
1158 alternative year numbers less than 10). Zero-padding can be
1159 overridden with the '_' or '-' flags (which are GNU extensions).
1161 * As a GNU extension, the '_' and '-' flags can now be applied to
1162 "%EY" to control how the year number is formatted; they have the
1163 same effect that they would on "%Ey".
1165 Deprecated and removed features, and other changes affecting compatibility:
1167 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1168 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1170 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1171 in <sys/procfs.h>, has been corrected to match the type actually used by
1172 the Linux kernel. This affects the size and layout of that structure on
1173 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1175 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1176 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1177 defined in <sys/procfs.h>, has been corrected to match the type actually
1178 used by the Linux kernel. This affects the size and layout of those
1181 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1182 meant to scan a string and allocate space for it with malloc, is now
1183 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1184 defined. This extension conflicts with C99's use of '%a' to scan a
1185 hexadecimal floating-point number, which is now available to programs
1186 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1188 POSIX.1-2008 includes the feature of allocating a buffer for string input
1189 with malloc, using the modifier letter 'm' instead. Programs using
1190 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1191 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1192 C99 '%a' no longer need to avoid _GNU_SOURCE.
1194 GCC's -Wformat warnings can detect most uses of this extension, as long
1195 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1196 __attribute__ ((format (scanf, ...))).
1198 Changes to build and runtime requirements:
1200 * Python 3.4 or later is required to build the GNU C Library.
1202 * On most architectures, GCC 5 or later is required to build the GNU C
1203 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1205 Older GCC versions and non-GNU compilers are still supported when
1206 compiling programs that use the GNU C Library.
1208 Security related changes:
1210 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1211 denial of service due to resource exhaustion when processing getaddrinfo
1212 calls with crafted host names. Reported by Guido Vranken.
1214 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1215 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1216 happened, accessing the 32-bit size_t value as the full 64-bit register
1217 in the assembly string/memory functions would cause a buffer overflow.
1218 Reported by H.J. Lu.
1220 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1221 addresses with arbitrary trailing characters, potentially leading to data
1222 or command injection issues in applications.
1224 The following bugs are resolved with this release:
1226 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1227 [10496] localedata: 12h time representation in multiple locales faulty
1228 [10797] localedata: it_IT locale numeric does not have a separator for
1230 [11319] libc: dprintf doesn't handle errors properly
1231 [16346] time: mktime: potentially unsafe use of localtime_offset
1232 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1234 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1235 posix_spawn_file_actions_addfchdir_np
1236 [17426] localedata: Indian locales: set the correct date format
1237 [17490] stdio: popen should not invoke atfork handlers
1238 [17783] libc: TIOCSER_TEMT conditions inconsistent
1239 [18040] regex: use-after-free in regexec/get_subexp
1240 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1241 [20018] network: getaddrinfo should reject IP addresses with trailing
1242 characters (CVE-2016-10739)
1243 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1244 [20271] libc: Missing "\n" in __libc_fatal calls
1245 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1246 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1247 pointer argument is non-NULL
1248 [21037] stdio: open_memstream and freopen
1249 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1250 [21716] time: Crash in glibc's mktime in low-memory situations
1251 [22834] stdio: Subprocess forked by popen may crash in Linux when
1252 multithreads call popen
1253 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1254 and pthread_create fails.
1255 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1256 [23125] libc: riscv64: endless loop when throwing an exception from a
1258 [23275] nptl: Race in pthread_mutex_lock while promoting to
1259 PTHREAD_MUTEX_ELISION_NP.
1260 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1262 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1264 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1266 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1267 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1269 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1270 [23521] nss: get_next_alias nss_files file stream leak
1271 [23538] nptl: Hang in pthread_cond_broadcast
1272 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1273 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1274 [23579] libc: Errors misreported in preadv2
1275 [23597] build: support/test-container.c doesn't work with different
1277 [23603] time: mktime signed integer overflow on large timestamps
1278 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1279 [23614] libc: powerpc: missing CFI register information in __mpn_*
1281 [23637] string: Generic strstr/strcasestr fails with huge needles
1282 [23640] libc: no way to easily clear FD_CLOEXEC in
1283 posix_spawn_file_actions_adddup2()
1284 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1286 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1288 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1289 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1290 bits/types/struct_rusage.h
1291 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1293 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1295 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1296 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1297 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1299 [23724] localedata: Albanian date formats are incorrect
1300 [23735] math: libnldbl_nonshared.a references internal libm symbols
1301 [23740] localedata: kl_GL: Month names and date formats need update
1302 [23744] regex: regex refactorings to remove BE, avoid duplication
1303 [23745] time: mktime fix for Gnulib + coreutils
1304 [23758] time: Improve the width of alternate representation for year in
1306 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1307 [23789] time: mktime does not set errno on failure
1308 [23791] localedata: Wrong monetary format for ca_ES locale
1309 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1310 [23794] locale: c16rtomb does not handle surrogate pairs
1311 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1312 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1313 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1314 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1315 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1316 [23862] libc: [sh] missing kernel-features.h undefines
1317 [23864] libc: [riscv] missing kernel-features.h undefines
1318 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1319 [23907] malloc: Incorrect double-free malloc tcache check disregards
1321 [23913] libc: off-by-one in function maybe_script_execute in
1322 sysdeps/posix/spawni.c
1323 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1324 [23923] locale: Add --no-hard-links option to localedef
1325 [23927] network: Linux if_nametoindex() does not close descriptor
1327 [23961] math: powf can overflow to inf without setting errno in non-
1328 nearest rounding mode
1329 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1330 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1331 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1332 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1333 [24011] localedata: Fixed small type in comment for locale bs_BA
1334 [24018] libc: gettext() may return NULL
1335 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1336 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1337 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1339 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1340 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1342 [24046] localedata: en_US locale doesn't define date_fmt
1343 [24063] manual: @var{errno} should be @code{errno}
1344 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1345 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1347 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1349 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1351 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1353 [24112] network: Do not send DNS queries for non-host names (where all
1354 answers will be rejected)
1355 [24130] libc: alpha __remqu corrupts $f3 register
1362 * The localization data for ISO 14651 is updated to match the 2016
1363 Edition 4 release of the standard, this matches data provided by
1364 Unicode 9.0.0. This update introduces significant improvements to the
1365 collation of Unicode characters. This release deviates slightly from
1366 the standard in that the collation element ordering for lowercase and
1367 uppercase LATIN script characters is adjusted to ensure that regular
1368 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1369 is not matched by [a-z]. With the update many locales have been
1370 updated to take advantage of the new collation information. The new
1371 collation information has increased the size of the compiled locale
1372 archive or binary locales.
1374 * The GNU C Library can now be compiled with support for Intel CET, AKA
1375 Intel Control-flow Enforcement Technology. When the library is built
1376 with --enable-cet, the resulting glibc is protected with indirect
1377 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1378 compatible with all existing executables and shared libraries. This
1379 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1380 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1381 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1382 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1383 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1384 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1387 * The GNU C Library now has correct support for ABSOLUTE symbols
1388 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1389 relocated incorrectly or in some cases discarded. The GNU linker can
1390 make use of the newer semantics, but it must communicate it to the
1391 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1392 field) to indicate such support is required.
1394 * Unicode 11.0.0 Support: Character encoding, character type info, and
1395 transliteration tables are all updated to Unicode 11.0.0, using
1396 generator scripts contributed by Mike FABIAN (Red Hat).
1398 * <math.h> functions that round their results to a narrower type are added
1399 from TS 18661-1:2014 and TS 18661-3:2015:
1401 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1402 fMxaddfNx functions.
1404 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1405 fMxsubfNx functions.
1407 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1408 fMxmulfNx functions.
1410 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1411 fMxdivfNx functions.
1413 * Two grammatical forms of month names are now supported for the following
1414 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1415 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1416 support two grammatical forms in abbreviated month names: Catalan, Greek,
1419 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1420 include the support for two grammatical forms of month names.
1422 * Building and running on GNU/Hurd systems now works without out-of-tree
1425 * The renameat2 function has been added, a variant of the renameat function
1426 which has a flags argument. If the flags are zero, the renameat2 function
1427 acts like renameat. If the flag is not zero and there is no kernel
1428 support for renameat2, the function will fail with an errno value of
1429 EINVAL. This is different from the existing gnulib function renameatu,
1430 which performs a plain rename operation in case of a RENAME_NOREPLACE
1431 flags and a non-existing destination (and therefore has a race condition
1432 that can clobber the destination inadvertently).
1434 * The statx function has been added, a variant of the fstatat64
1435 function with an additional flags argument. If there is no direct
1436 kernel support for statx, glibc provides basic stat support based on
1437 the fstatat64 function.
1439 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1440 library if installed. libidn2 version 2.0.5 or later is recommended. If
1441 libidn2 is not available, internationalized domain names are not encoded
1442 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1443 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1444 with an encoding error.) Flags which used to change the IDN encoding and
1445 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1446 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1447 deprecated. They no longer have any effect.
1449 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1450 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1451 range of ELF gABI expressions including such constructs as
1452 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1453 have been further restricted, and where in the past a dynamic string
1454 token sequence may have been interpreted as a literal string it will
1455 now cause a load failure. These load failures were always considered
1456 unspecified behaviour from the perspective of the dynamic loader, and
1457 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1458 results in a load failure now.
1460 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1461 implementation includes all the standard functions provided by
1464 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1465 thrd_detach, thrd_exit, and thrd_join for thread management.
1467 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1468 mtx_destroy for mutual exclusion.
1470 - call_once for function call synchronization.
1472 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1473 cnd_wait for conditional variables.
1475 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1477 Application developers must link against libpthread to use ISO C threads.
1479 Deprecated and removed features, and other changes affecting compatibility:
1481 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1482 installed. Software that was using either header should be updated to
1483 use standard <stdio.h> interfaces instead.
1485 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1486 This was never required by the C standard, and the macros just expanded
1487 to call alternative names for the same functions. If you hoped getc and
1488 putc would provide performance improvements over fgetc and fputc, instead
1489 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1490 necessary, flockfile and funlockfile.
1492 * All stdio functions now treat end-of-file as a sticky condition. If you
1493 read from a file until EOF, and then the file is enlarged by another
1494 process, you must call clearerr or another function with the same effect
1495 (e.g. fseek, rewind) before you can read the additional data. This
1496 corrects a longstanding C99 conformance bug. It is most likely to affect
1497 programs that use stdio to read interactive input from a terminal.
1500 * The macros 'major', 'minor', and 'makedev' are now only available from
1501 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1502 headers that happen to include <sys/types.h>. These macros are rarely
1503 used, not part of POSIX nor XSI, and their names frequently collide with
1504 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1505 further explanation.
1507 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1508 these macros should first include <sys/types.h>, and then include
1509 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1511 * The tilegx*-*-linux-gnu configurations are no longer supported.
1513 * The obsolete function ustat is no longer available to newly linked
1514 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1515 function has been deprecated in favor of fstatfs and statfs.
1517 * The obsolete function nfsservctl is no longer available to newly linked
1518 binaries. This function was specific to systems using the Linux kernel
1519 and could not usefully be used with the GNU C Library on systems with
1520 version 3.1 or later of the Linux kernel.
1522 * The obsolete function name llseek is no longer available to newly linked
1523 binaries. This function was specific to systems using the Linux kernel
1524 and was not declared in a header. Programs should use the lseek64 name
1525 for this function instead.
1527 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1528 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1529 previously selected by them is now always enabled.
1531 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1532 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1533 restriction (rejecting '_' in host names, among other things) has been
1534 removed, for increased compatibility with non-IDN name resolution.
1536 * The fcntl function now have a Long File Support variant named fcntl64. It
1537 is added to fix some Linux Open File Description (OFD) locks usage on non
1538 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1539 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1540 locks act as a cancellation entrypoint.
1542 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1543 ecb_crypt, and des_setparity are no longer available to newly linked
1544 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1545 longer installed. These functions encrypted and decrypted data with the
1546 DES block cipher, which is no longer considered secure. Software that
1547 still uses these functions should switch to a modern cryptography library,
1550 * Reflecting the removal of the encrypt and setkey functions above, the
1551 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1552 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1555 * The obsolete function fcrypt is no longer available to newly linked
1556 binaries. It was just another name for the standard function crypt,
1557 and it has not appeared in any header file in many years.
1559 * We have tentative plans to hand off maintenance of the passphrase-hashing
1560 library, libcrypt, to a separate development project that will, we hope,
1561 keep up better with new passphrase-hashing algorithms. We will continue
1562 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1563 'crypt_r' should not need to change at all; however, distributions will
1564 need to install <crypt.h> and libcrypt from a separate project.
1566 In this release, if the configure option --disable-crypt is used, glibc
1567 will not install <crypt.h> or libcrypt, making room for the separate
1568 project's versions of these files. The plan is to make this the default
1569 behavior in a future release.
1571 Changes to build and runtime requirements:
1573 GNU make 4.0 or later is now required to build glibc.
1575 Security related changes:
1577 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1578 been fixed by removing the glibc-internal IDNA implementation and using
1579 the system-provided libidn2 library instead. Originally reported by Hanno
1580 Böck and Christian Weisgerber.
1582 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1583 architecture could corrupt memory. Reported by Max Horn.
1585 CVE-2018-11236: Very long pathname arguments to realpath function could
1586 result in an integer overflow and buffer overflow. Reported by Alexey
1589 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1590 architecture could write beyond the target buffer, resulting in a buffer
1591 overflow. Reported by Andreas Schwab.
1593 The following bugs are resolved with this release:
1595 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1596 [6889] manual: 'PWD' mentioned but not specified
1597 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1598 when __WORDSIZE != 64
1599 [13762] regex: re_search etc. should return -2 on memory exhaustion
1600 [13888] build: /tmp usage during testing
1601 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1602 [14092] nptl: Support C11 threads
1603 [14095] localedata: Review / update collation data from Unicode / ISO
1605 [14508] libc: -Wformat warnings
1606 [14553] libc: Namespace pollution loff_t in sys/types.h
1607 [14890] libc: Make NT_PRFPREG canonical.
1608 [15105] libc: Extra PLT references with -Os
1609 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1611 [16335] manual: Feature test macro documentation incomplete and out of
1613 [16552] libc: Unify umount implementations in terms of umount2
1614 [17082] libc: htons et al.: statement-expressions prevent use on global
1615 scope with -O1 and higher
1616 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1617 [17438] localedata: pt_BR: wrong d_fmt delimiter
1618 [17662] libc: please implement binding for the new renameat2 syscall
1619 [17721] libc: __restrict defined as /* Ignore */ even in c11
1620 [17979] libc: inconsistency between uchar.h and stdint.h
1621 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1622 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1623 horrible machine code)
1624 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1626 [18471] libc: llseek should be a compat symbol
1627 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1629 [18991] nss: nss_files skips large entry in database
1630 [19239] libc: Including stdlib.h ends up with macros major and minor being
1632 [19463] libc: linknamespace failures when compiled with -Os
1633 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1634 [19527] locale: Normalized charset name not recognized by setlocale
1635 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1636 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1638 [19728] network: out of bounds stack read in libidn function
1639 idna_to_ascii_4i (CVE-2016-6261)
1640 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1641 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1642 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1644 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1645 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1646 [20419] dynamic-link: files with large allocated notes crash in
1648 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1649 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1650 [20980] manual: CFLAGS environment variable replaces vital options
1651 [21163] regex: Assertion failure in pop_fail_stack when executing a
1652 malformed regexp (CVE-2015-8985)
1653 [21234] manual: use of CFLAGS makes glibc detect no optimization
1654 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1655 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1656 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1657 [21508] locale: intl/tst-gettext failure with latest msgfmt
1658 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1659 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1660 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1662 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1664 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1665 [22247] network: Integer overflow in the decode_digit function in
1666 puny_decode.c in libidn (CVE-2017-14062)
1667 [22342] nscd: NSCD not properly caching netgroup
1668 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1669 [22550] localedata: es_ES locale (and other es_* locales): collation
1670 should treat ñ as a primary different character, sync the collation
1671 for Spanish with CLDR
1672 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1673 by gcc configured with --enable-default-pie
1674 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1675 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1676 crossing 2GB threshold (CVE-2017-18269)
1677 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1679 [22735] time: Misleading typo in time.h source comment regarding
1681 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1682 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1683 `__assert_perror_fail ()' to `__assert_fail_base ()'
1684 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1686 [22786] libc: Stack buffer overflow in realpath() if input size is close
1687 to SSIZE_MAX (CVE-2018-11236)
1688 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1689 through an absolute DT_NEEDED path
1690 [22792] build: tcb-offsets.h dependency dropped
1691 [22797] libc: pkey_get() uses non-reserved name of argument
1692 [22807] libc: PTRACE_* constants missing for powerpc
1693 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1694 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1695 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1696 [22848] localedata: ca_ES: update date definitions from CLDR
1697 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1698 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1699 [22896] localedata: Update locale data for an_ES
1700 [22902] math: float128 test failures with GCC 8
1701 [22918] libc: multiple common of `__nss_shadow_database'
1702 [22919] libc: sparc32: backtrace yields infinite backtrace with
1704 [22926] libc: FTBFS on powerpcspe
1705 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1707 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1708 [22947] libc: FAIL: misc/tst-preadvwritev2
1709 [22963] localedata: cs_CZ: Add alternative month names
1710 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1711 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1712 [22998] dynamic-link: execstack tests are disabled when SELinux is
1714 [23005] network: Crash in __res_context_send after memory allocation
1716 [23007] math: strtod cannot handle -nan
1717 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1718 [23036] regex: regex equivalence class regression
1719 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1720 [23069] libc: sigaction broken on riscv64-linux-gnu
1721 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1722 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1723 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1724 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1725 and libc build with -Os)
1726 [23140] localedata: More languages need two forms of month names
1727 [23145] libc: _init/_fini aren't marked as hidden
1728 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1729 [23171] math: C++ iseqsig for long double converts arguments to double
1730 [23178] nscd: sudo will fail when it is run in concurrent with commands
1731 that changes /etc/passwd
1732 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1734 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1735 [23208] localedata: New locale - Lower Sorbian (dsb)
1736 [23233] regex: Memory leak in build_charclass_op function in file
1738 [23236] stdio: Harden function pointers in _IO_str_fields
1739 [23250] nptl: Offset of __private_ss differs from GCC
1740 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1741 -mtune=generic -mfpmath=sse
1742 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1744 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1745 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1747 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1748 [23277] math: nan function should not have const attribute
1749 [23279] math: scanf and strtod wrong for some hex floating-point
1750 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1752 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1753 [23303] build: undefined reference to symbol
1754 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1755 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1757 [23313] stdio: libio vtables validation and standard file object
1759 [23329] libc: The __libc_freeres infrastructure is not properly run across
1761 [23349] libc: Various glibc headers no longer compatible with
1763 [23351] malloc: Remove unused code related to heap dumps and malloc
1765 [23363] stdio: stdio-common/tst-printf.c has non-free license
1766 [23396] regex: Regex equivalence regression in single-byte locales
1767 [23422] localedata: oc_FR: More updates of locale data
1768 [23442] build: New warning with GCC 8
1769 [23448] libc: Out of bounds access in IBM-1390 converter
1770 [23456] libc: Wrong index_cpu_LZCNT
1771 [23458] build: tst-get-cpu-features-static isn't added to tests
1772 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1774 [23467] dynamic-link: x86/CET: A property note parser bug
1781 * The GNU C Library can now be compiled with support for building static
1782 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1783 executables are like static executables but can be loaded at any address
1784 and provide additional security hardening benefits at the cost of some
1785 memory and performance. When the library is built with --enable-static-pie
1786 the resulting libc.a is usable with GCC 8 and above to create static PIE
1787 executables using the GCC option '-static-pie'. This feature is currently
1788 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1789 aarch64 with binutils 2.30 or later.
1791 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1792 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1795 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1797 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1799 * In order to support faster and safer process termination the malloc API
1800 family of functions will no longer print a failure address and stack
1801 backtrace after detecting heap corruption. The goal is to minimize the
1802 amount of work done after corruption is detected and to avoid potential
1803 security issues in continued process execution. Reducing shutdown time
1804 leads to lower overall process restart latency, so there is benefit both
1805 from a security and performance perspective.
1807 * The abort function terminates the process immediately, without flushing
1808 stdio streams. Previous glibc versions used to flush streams, resulting
1809 in deadlocks and further data corruption. This change also affects
1810 process aborts as the result of assertion failures.
1812 * On platforms where long double has the IEEE binary128 format (aarch64,
1813 alpha, mips64, riscv, s390 and sparc), the math library now implements
1814 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1815 These are the same interfaces added in version 2.26 for some platforms where
1816 this format is supported but is not the format of long double.
1818 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1819 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1820 implements interfaces for that type, as defined by ISO/IEC TS
1821 18661-3:2015. These are corresponding interfaces to those supported for
1824 * The math library now implements interfaces for the _Float32, _Float64 and
1825 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1826 corresponding interfaces to those supported for _Float128.
1828 * glibc now implements the memfd_create and mlock2 functions on Linux.
1830 * Support for memory protection keys was added. The <sys/mman.h> header now
1831 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1834 * The copy_file_range function was added.
1836 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1838 * The ldconfig utility now processes `include' directives using the C/POSIX
1839 collation ordering. Previous glibc versions used locale-specific
1840 ordering, the change might break systems that relied on that.
1842 * Support for two grammatical forms of month names has been added.
1843 In a call to strftime, the "%B" and "%b" format specifiers will now
1844 produce the grammatical form required when the month is used as part
1845 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1846 required when the month is named by itself. For instance, in Greek
1847 and in many Slavic and Baltic languages, "%B" will produce the month
1848 in genitive case, and "%OB" will produce the month in nominative case.
1850 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1851 are all valid and will all accept any known form of month
1852 name---standalone or complete, abbreviated or full. In a call to
1853 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1854 the strings used by "%B" and "%b", respectively. New query
1855 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1856 used by "%OB" and "%Ob", respectively.
1858 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1859 define the strings for %OB and %Ob, respectively; these have the
1860 same syntax as "mon" and "abmon". These arrays are optional; if they
1861 are not provided then they have the same content as "mon" and "abmon",
1864 These features are provided for locales which define "alt_mon" and/or
1865 "ab_alt_mon" in their locale source data. This release includes such
1866 alternative month name data for the following languages: Belarusian,
1867 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1869 This feature is currently a GNU extension, but it is expected to
1870 be added to the next revision of POSIX, and it is also already
1871 available on some BSD-derived operating systems.
1873 This feature will cause existing statically compiled applications
1874 to fail to load locales and fall back to the builtin C/POSIX locales.
1875 See notes below for other changes affecting compatibility.
1877 * Support for the RISC-V ISA running on Linux has been added. This port
1878 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1879 for the following ISA and ABI pairs:
1885 Deprecated and removed features, and other changes affecting compatibility:
1887 * Statically compiled applications attempting to load locales compiled for the
1888 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1889 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1890 support for two grammatical forms of the month names, also extends the locale
1891 data binary format. Static applications needing locale support must be
1892 recompiled to match the runtime and data they are deployed with. In some
1893 distributions there is an upgrade window where dynamically linked applications
1894 may use a new library but the old locale data and also fall back to the
1895 builtin C/POSIX locales; restarting the application process is sufficient to
1898 * Support for statically linked applications which call dlopen is deprecated
1899 and will be removed in a future version of glibc. Applications which call
1900 dlopen need to be linked dynamically instead.
1902 * Support for old programs which use internal stdio data structures and
1903 functions is deprecated. This includes programs which use the C++ streams
1904 provided by libstdc++ in GCC 2.95. Programs which use the internal
1905 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1906 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1907 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1908 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1909 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1910 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1911 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1912 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1913 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1914 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1915 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1916 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1917 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1918 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1919 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1920 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1921 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1922 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1923 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1924 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1925 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1926 future version of glibc. Unlike other symbol removals, these old
1927 applications will not be supported using compatibility symbols.
1929 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1930 defined by <sys/ptrace.h>.
1932 * libm no longer supports SVID error handling (calling a user-provided
1933 matherr function on error) or the _LIB_VERSION variable to control error
1934 handling. (SVID error handling and the _LIB_VERSION variable still work
1935 for binaries linked against older versions of the GNU C Library.) The
1936 libieee.a library is no longer provided. math.h no longer defines struct
1937 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1938 TLOSS, PLOSS and HUGE.
1940 * The libm functions pow10, pow10f and pow10l are no longer supported for
1941 new programs. Programs should use the standard names exp10, exp10f and
1942 exp10l for these functions instead.
1944 * The mcontext_t type is no longer the same as struct sigcontext. On
1945 platforms where it was previously the same, this changes the C++ name
1946 mangling for interfaces involving this type.
1948 * The add-ons mechanism for building additional packages at the same time as
1949 glibc has been removed. The --enable-add-ons configure option is now
1952 * The --without-fp configure option is now ignored. Whether hardware
1953 floating-point instructions are used is now configured based on whether
1954 the compiler used at configure time (without any options implied by a
1955 --with-cpu= configure option) uses such instructions.
1957 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1958 the specified string can be parsed as a domain name.
1960 * In the malloc_info output, the <heap> element may contain another <aspace>
1961 element, "subheaps", which contains the number of sub-heaps.
1963 * The libresolv function p_secstodate is no longer supported for new
1966 * The tilepro-*-linux-gnu configuration is no longer supported.
1968 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1969 and will be removed in a future release. Software that is still using
1970 either header should be updated to use standard <stdio.h> interfaces
1973 libio.h was originally the header for a set of supported GNU extensions,
1974 but they have not been maintained as such in many years, they are now
1975 standing in the way of improvements to stdio, and we don't think there are
1976 any remaining external users. _G_config.h was never intended for public
1977 use, but predates the bits convention.
1979 Changes to build and runtime requirements:
1981 * bison version 2.7 or later is required to generate code in the 'intl'
1984 Security related changes:
1986 CVE-2009-5064: The ldd script would sometimes run the program under
1987 examination directly, without preventing code execution through the
1988 dynamic linker. (The glibc project disputes that this is a security
1989 vulnerability; only trusted binaries must be examined using the ldd
1992 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1993 suffered from a one-byte overflow during ~ operator processing (either
1994 on the stack or the heap, depending on the length of the user name).
1995 Reported by Tim Rühsen.
1997 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1998 would sometimes fail to free memory allocated during ~ operator
1999 processing, leading to a memory leak and, potentially, to a denial
2002 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2003 without GLOB_NOESCAPE, could write past the end of a buffer while
2004 unescaping user names. Reported by Tim Rühsen.
2006 CVE-2017-17426: The malloc function, when called with an object size near
2007 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2008 instead of NULL. This was a regression introduced with the new malloc
2009 thread cache in glibc 2.26. Reported by Iain Buclaw.
2011 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2012 to the allocation of too much memory. (This is not a security bug per se,
2013 it is mentioned here only because of the CVE assignment.) Reported by
2016 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2017 of the number of search path components. (This is not a security
2018 vulnerability per se because no trust boundary is crossed if the fix for
2019 CVE-2017-1000366 has been applied, but it is mentioned here only because
2020 of the CVE assignment.) Reported by Qualys.
2022 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2023 for AT_SECURE or SUID binaries could be used to load libraries from the
2026 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2027 succeeds without returning an absolute path due to unexpected behaviour
2028 of the Linux kernel getcwd syscall. Reported by halfdog.
2030 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2031 an object size near the value of SIZE_MAX, would return a pointer to a
2032 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2034 CVE-2018-6551: The malloc function, when called with an object size near
2035 the value of SIZE_MAX, would return a pointer to a buffer which is too
2036 small, instead of NULL.
2038 The following bugs are resolved with this release:
2040 [866] glob: glob should match dangling symlinks
2041 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2042 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2044 [5997] math: Very slow execution of sinf function
2045 [10580] localedata: hr_HR: updated locale
2046 [10871] locale: 'mon' array should contain both nominative and genitive
2048 [12349] localedata: eu_ES: incorrect thousands separator
2049 [13605] localedata: shn_MM: new Shan locale
2050 [13805] localedata: ru_RU: currency should use ',' as radix point
2051 [13953] localedata: km_KH: locale update
2052 [13994] localedata: mjw_IN: new locale
2053 [14121] build: make writes .mo files in po directory
2054 [14333] libc: Fix the race between atexit() and exit()
2055 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2056 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2058 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2059 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2060 width Latin characters
2061 [15332] localedata: es_CU: locale update
2062 [15436] stdio: Don't close or flush stdio streams on abort
2063 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2065 [16148] localedata: ca_ES: incorrect thousands separator
2066 [16750] dynamic-link: ldd should not try to execute the binaries
2068 [16777] localedata: pl_PL: incorrect thousands separator in locale
2069 [16905] localedata: hanzi: new collation
2070 [17563] localedata: cmn_TW: add hanzi collation
2071 [17750] localedata: wrong collation order of diacritics in most locales
2072 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2074 [17956] build: Build fails on missing definitions from header file
2075 nss/nss.h when Mozilla NSS is used for cryptography
2076 [18203] libc: realpath() does not handle unreachable paths correctly
2077 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2078 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2079 [18822] libc: Internal functions are called via PLT
2080 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2081 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2082 [19574] libc: glibc should support building static PIE binaries
2083 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2085 [19971] glob: glob: Do not skip entries with zero d_ino values
2086 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2087 [20008] localedata: km_KH: convert to translit_neutral
2088 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2089 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2090 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2091 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2092 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2094 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2095 they're set, wrong errors returned by gaih_inet when lookup functions
2097 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2098 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2100 [20952] localedata: yuw_PG: new locale
2101 [21084] localedata: charmaps/IBM858: new codepage
2102 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2103 [21242] libc: assert gives pedantic warning in old gcc versions
2104 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2105 __regcall calling convention
2106 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2107 [21326] libc: C99 functions are not declared for C++11 and later if
2108 _GNU_SOURCE is not predefined by g++
2109 [21457] libc: sys/ucontext.h namespace
2110 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2111 [21660] math: GCC fails to compile a formula with tgmath.h
2112 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2113 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2114 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2115 [21684] math: tgmath.h handling of complex integers
2116 [21685] math: tgmath.h handling of bit-fields
2117 [21686] math: tgmath.h handling of __int128
2118 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2120 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2122 [21750] localedata: column width of characters incompatible with classical
2124 [21754] malloc: malloc: Perform as little work as possible after heap
2125 consistency check failures
2126 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2127 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2128 [21791] string: Unused XXX_chk_XXX functions in libc.a
2129 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2131 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2133 [21845] localedata: Added new Locale bho_NP
2134 [21853] localedata: Fix abday Which looks same as day in zh_SG
2135 [21854] localedata: Added New Locale en_SC
2136 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2137 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2138 _dl_runtime_resolve_avx_slow
2139 [21885] network: getaddrinfo: gethosts does not release resolver context
2140 on memory allocation failure
2141 [21899] libc: XPG4.2 sigaction namespace
2142 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2144 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2146 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2147 errno value, causing getaddrinfo to fail
2148 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2149 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2150 instead of EAI_NODATA
2151 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2152 constant PTRACE_SEIZE_DEVEL
2153 [21930] math: C-only gcc builtins used in <math.h> isinf
2154 [21932] network: Unpaired __resolv_context_get in generic get*_r
2156 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2157 [21944] libc: sigval namespace
2158 [21951] localedata: Update hanzi collation by stroke
2159 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2160 sysdeps/x86_64/fpu/e_expf.S
2161 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2162 allocation in syscall loops)
2163 [21959] localedata: Fix Country name for xh_ZA
2164 [21960] localedata: Fix abmon for bem_ZM
2165 [21966] math: AVX2 mathvec functions use FMA without checking
2166 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2167 [21971] localedata: Added New Locale for mfe_MU
2168 [21972] libc: assert macro requires operator== (int) for its argument type
2169 [21973] math: [sparc] libm missing sqrtl compat symbol
2170 [21974] libc: Remove __bb_init_func and __bb_exit_func
2171 [21982] string: stratcliff.c: error: assuming signed overflow does not
2173 [21986] stdio: __guess_grouping is called incorrectly
2174 [21987] math: [sparc32] wrong bits/long-double.h installed
2175 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2177 [22022] localedata: Missing country_name for mni_IN
2178 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2180 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2182 [22026] locale: iconv_open: heap overflow on gconv_init failure
2183 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2184 [22035] math: [m68k] bits/math-inline.h macro namespace
2185 [22038] localedata: Fix abbreviated weeks and months for Somali
2186 [22044] localedata: Remove redundant data for Limburgish Language
2187 [22050] malloc: Linking with -lmcheck does not hook
2188 __malloc_initialize_hook correctly
2189 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2190 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2191 [22070] localedata: charmaps/UTF-8: wcwidth for
2192 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2193 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2194 Jungseong and Jongseong) should be 0
2195 [22078] nss: nss_files performance issue in multi mode
2196 [22082] math: bits/math-finite.h exp10 condition
2197 [22086] libc: pcprofiledump incorrect cross-endian condition
2198 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2199 [22095] network: Name server address allocation memory leak in resolv.conf
2201 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2203 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2204 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2206 [22111] malloc: malloc: per thread cache is not returned when thread exits
2207 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2208 [22134] libc: [linux] implement fexecve with execveat
2209 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2211 [22145] libc: ttyname() gives up too early in the face of namespaces
2212 [22146] math: C++ build issue with float128 on x86_64
2213 [22153] nptl: nptl: save error code before process termination
2214 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2215 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2216 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2217 [22165] libc: [hppa] Text relocations in libc.so
2218 [22180] libc: destructor registered via __cxa_atexit is called twice
2219 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2220 symlinks") cause "make" segfaults
2221 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2223 [22207] libc: FAIL: stdlib/test-atexit-race
2224 [22225] math: nearbyint arithmetic moved before feholdexcept
2225 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2226 [22235] math: iscanonical in C++ and float128
2227 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2228 the svid compat wrapper
2229 [22244] math: ynf and yn are wrong without the svid compat wrapper
2230 [22273] libc: Improper assert in Linux posix_spawn implementation
2231 [22284] libc: -pg -pie doesn't work
2232 [22292] locale: localedef exits with error 4 when it should be error 1
2233 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2234 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2236 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2237 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2239 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2240 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2241 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2242 [22322] libc: [mips64] wrong bits/long-double.h installed
2243 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2244 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2246 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2247 [22343] malloc: Integer overflow in posix_memalign
2248 [22347] libc: getrandom() returns the number of bytes that were copied to
2249 the buffer even though the comments say "Return 0 on success and -1 on
2251 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2252 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2254 [22370] dynamic-link: Incorrect note padding check
2255 [22375] libc: malloc returns pointer from tcache_get when should return
2256 NULL (CVE-2017-17426)
2257 [22377] math: iseqsig, float128 and C++
2258 [22382] localedata: Error in tpi_PG locale
2259 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2260 inside the ASCII printable range
2261 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2263 [22403] localedata: Slash needs escaping in some locales
2264 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2265 [22409] network: res_hnok does not accept some host names used on the
2267 [22412] network: res_dnok, res_hnok should perform syntax checks
2268 [22413] network: ns_name_pton ignores syntactically invalid trailing
2270 [22415] stdio: setvbuf can lead to invalid free/segfault
2271 [22432] build: Non-deterministic build
2272 [22439] malloc: malloc_info should compute summary statistics for all sub-
2274 [22442] network: if_nametoindex could report index for the wrong
2275 networking interface
2276 [22446] build: aliasing violation calling readlink in handle_request
2277 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2278 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2279 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2280 __nscd_hash/__nss_hash
2281 [22463] network: p_secstodate overflow handling
2282 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2283 [22478] libc: sigwait can fail with EINTR
2284 [22505] libc: ldconfig processes include directive in locale-specific
2286 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2287 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2288 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2289 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2290 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2291 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2292 same as for Croatian
2293 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2294 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2295 [22577] libc: missing newline after "cannot allocate TLS data structures
2297 [22588] manual: manual/conf.texi: missing underscore in front of
2299 [22593] math: nextafter and nexttoward are declared with const attribute
2300 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2301 [22603] string: ia64 memchr overflows internal pointer check
2302 [22605] libc: SH clone does not set the exit code correctly
2303 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2305 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2306 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2307 modified in case of success
2308 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2309 [22615] manual: manual: ambiguous wording about errno value in case of
2311 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2313 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2314 binaries or if /proc is not mounted (CVE-2017-16997)
2315 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2316 [22630] build: $(no-pie-ldflag) is no longer effective
2317 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2318 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2319 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2320 [22637] nptl: guard size is subtracted from thread stack size instead of
2322 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2323 [22657] localedata: hu_HU: Avoid double space in date
2324 [22660] math: fmax, fmin sNaN handling on alpha
2325 [22664] libc: New warning of GCC8
2326 [22665] math: alpha: ceil and floor raise inexact exceptions
2327 [22666] math: alpha: trunc raise inexact exceptions
2328 [22667] libc: makecontext lacks stack alignment on i386
2329 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2330 [22679] libc: getcwd(3) can succeed without returning an absolute path
2332 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2333 elision and tunables
2334 [22687] math: [powerpc-nofpu] complex long double functions spurious
2336 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2337 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2338 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2340 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2341 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2343 [22701] nis: Incomplete removal of libnsl
2344 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2345 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2346 [22715] dynamic-link: FAIL: elf/tst-audit10
2347 [22719] libc: Backtrace tests fail on hppa
2348 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2349 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2350 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2351 before the first call to crypt_r () in crypt/badsalttest.c
2358 * A per-thread cache has been added to malloc. Access to the cache requires
2359 no locks and therefore significantly accelerates the fast path to allocate
2360 and free small amounts of memory. Refilling an empty cache requires locking
2361 the underlying arena. Performance measurements show significant gains in a
2362 wide variety of user workloads. Workloads were captured using a special
2363 instrumented malloc and analyzed with a malloc simulator. Contributed by
2364 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2366 * Unicode 10.0.0 Support: Character encoding, character type info, and
2367 transliteration tables are all updated to Unicode 10.0.0, using
2368 generator scripts contributed by Mike FABIAN (Red Hat).
2369 These updates cause user visible changes, especially the changes in
2370 wcwidth for many emoji characters cause problems when emoji sequences
2371 are rendered with pango, see for example:
2372 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2374 * Collation of Hungarian has been overhauled and is now consistent with "The
2375 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2378 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2380 - The GNU C Library will now detect when /etc/resolv.conf has been
2381 modified and reload the changed configuration. The new resolver option
2382 “no-reload” (RES_NORELOAD) disables this behavior.
2384 - The GNU C Library now supports an arbitrary number of search domains
2385 (configured using the “search” directive in /etc/resolv.conf);
2386 previously, there was a hard limit of six domains. For backward
2387 compatibility, applications that directly modify the ‘_res’ global
2388 object are still limited to six search domains.
2390 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2391 Library will now randomly pick a name server from the configuration as a
2392 starting point. (Previously, the second name server was always used.)
2394 * The tunables feature is now enabled by default. This allows users to tweak
2395 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2397 * New function reallocarray, which resizes an allocated block (like realloc)
2398 to the product of two sizes, with a guaranteed clean failure upon integer
2399 overflow in the multiplication. Originally from OpenBSD, contributed by
2400 Dennis Wölfing and Rüdiger Sonderfeld.
2402 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2403 These are extended versions of preadv and pwritev, respectively, taking an
2404 additional flags argument. The set of supported flags depends on the
2405 running kernel; full support currently requires kernel 4.7 or later.
2407 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2408 create a new session ID for the spawned process. This feature is
2409 scheduled to be added to the next major revision of POSIX; for the time
2410 being, it is available under _GNU_SOURCE.
2412 * errno.h is now safe to use from C-preprocessed assembly language on all
2413 supported operating systems. In this context, it will only define the
2414 Exxxx constants, as preprocessor macros expanding to integer literals.
2416 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2417 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2418 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2419 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2421 To compile programs that use this feature, the compiler must support
2422 128-bit floating point with the type name _Float128 (as defined by TS
2423 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2424 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2425 must be defined to make the new interfaces visible.
2427 The new functions and macros correspond to those present for other
2428 floating-point types (except for a few obsolescent interfaces not
2429 supported for the new type), with F128 or f128 suffixes; for example,
2430 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2431 printf or scanf formats for the new type; the strfromf128 and strtof128
2432 interfaces should be used instead.
2434 Deprecated and removed features, and other changes affecting compatibility:
2436 * The synchronization that pthread_spin_unlock performs has been changed to
2437 now be equivalent to a C11 atomic store with release memory order to the
2438 spin lock's memory location. Previously, several (but not all)
2439 architectures used stronger synchronization (e.g., containing what is
2440 often called a full barrier). This change can improve performance, but
2441 may affect odd fringe uses of spin locks that depend on the previous
2442 behavior (e.g., using spin locks as atomic variables to try to implement
2443 Dekker's mutual exclusion algorithm).
2445 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2448 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2449 will only be built and installed when the GNU C Library is configured with
2450 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2451 as TIRPC or rpcsvc-proto, to be used.
2453 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2454 libnss_compat, are deprecated, and will not be built or installed by
2457 The NIS(+) support library, libnsl, is also deprecated. By default, a
2458 compatibility shared library will be built and installed, but not headers
2459 or development libraries. Only a few NIS-related programs require this
2460 library. (In particular, the GNU C Library has never required programs
2461 that use 'gethostbyname' to be linked with libnsl.)
2463 Replacement implementations based on TIRPC, which additionally support
2464 IPv6, are available from <https://github.com/thkukuk/>. The configure
2465 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2466 name service modules, to be built and installed.
2468 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2469 support is enabled, the configured recursive resolver must support EDNS.
2470 (Responding to EDNS-enabled queries with responses which are not
2471 EDNS-enabled is fine, but FORMERR responses are not.)
2473 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2474 servers have not supported this opcode for a long time.
2476 * The _res_opcodes variable has been removed from libresolv. It had been
2477 exported by accident.
2479 * <string.h> no longer includes inline versions of any string functions,
2480 as this kind of optimization is better done by the compiler. The macros
2481 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2483 * The nonstandard header <xlocale.h> has been removed. Most programs should
2484 use <locale.h> instead. If you have a specific need for the definition of
2485 locale_t with no other declarations, please contact
2486 libc-alpha@sourceware.org and explain.
2488 * The obsolete header <sys/ultrasound.h> has been removed.
2490 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2492 * The obsolete function cfree has been removed. Applications should use
2495 * The stack_t type no longer has the name struct sigaltstack. This changes
2496 the C++ name mangling for interfaces involving this type.
2498 * The ucontext_t type no longer has the name struct ucontext. This changes
2499 the C++ name mangling for interfaces involving this type.
2501 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2502 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2503 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2504 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2505 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2506 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2507 fpregset_t type no longer has the name struct fpu. This changes the C++
2508 name mangling for interfaces involving those types.
2510 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2511 synced with the kernel:
2513 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2514 are not supported on this architecture and have been removed.
2516 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2517 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2518 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2520 Programs that assume the GET/SETREGS ptrace requests are universally
2521 available will now fail to build, instead of malfunctioning at runtime.
2523 Changes to build and runtime requirements:
2525 * Linux kernel 3.2 or later is required at runtime, on all architectures
2526 supported by that kernel. (This is a change from version 2.25 only for
2529 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2531 * On most architectures, GCC 4.9 or later is required to build the GNU C
2532 Library. On powerpc64le, GCC 6.2 or later is required.
2534 Older GCC versions and non-GNU compilers are still supported when
2535 compiling programs that use the GNU C Library. (We do not know exactly
2536 how old, and some GNU extensions to C may be _de facto_ required. If you
2537 are interested in helping us make this statement less vague, please
2538 contact libc-alpha@sourceware.org.)
2540 Security related changes:
2542 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2543 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2545 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2546 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2548 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2549 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2552 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2553 fixed (CVE-2017-12133).
2555 The following bugs are resolved with this release:
2557 [984] network: Respond to changed resolv.conf in gethostbyname
2558 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2559 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2561 [12189] libc: __stack_chk_fail should not attempt a backtrace
2563 [14096] time: Race condition on timezone/tst-timezone.out
2564 [14172] localedata: az_IR: new locale
2565 [14995] build: glibc fails to build if gold is the default linker, even if
2567 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2568 [16637] network: inet_pton function is accepting IPv6 with bad format
2569 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2570 x86 and other generic code
2571 [16875] localedata: ko_KR: fix lang_name
2572 [17225] localedata: ar_SY: localized month names for May and June are
2574 [17297] localedata: da_DK: wrong date_fmt string
2575 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2576 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2577 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2578 [19066] localedata: ar_SA abbreviated day and month names are in English
2579 [19569] network: resolv: Support an arbitrary number of search domains
2580 [19570] network: Implement random DNS server selection in the stub
2582 [19838] locale: localedef fails on PA-RISC
2583 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2584 order of 0D36 and 0D37
2585 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2587 [20098] libc: FAIL: debug/backtrace-tst on hppa
2588 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2590 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2592 [20313] localedata: Update locale data to Unicode 9.0
2593 [20424] manual: Document how to provide a malloc replacement
2594 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2596 [20686] locale: Add el_GR@euro to SUPPORTED.
2597 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2598 failures consistently
2599 [21015] dynamic-link: Document and fix --enable-bind-now
2600 [21016] nptl: pthread_cond support is broken on hppa
2601 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2602 frame-pointer on i386
2603 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2605 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2606 [21088] libc: Build fails with --enable-static-nss
2607 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2608 generic c code is used
2609 [21109] libc: Tunables broken on big-endian
2610 [21112] math: powf has large ulp errors with base close to 1 and exponent
2612 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2614 [21120] malloc: glibc malloc is incompatible with GCC 7
2615 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2617 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2618 (-0.0) when linking with -lieee
2619 [21171] math: log10, log2 and lgamma return incorrect results
2620 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2621 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2622 [21207] localedata: ce_RU: update weekdays from CLDR
2623 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2624 [21217] localedata: Update months from CLDR-31
2625 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2626 [21243] libc: support_delete_temp_file should issue warning for failed
2628 [21244] libc: support resolv_test_start() socket fd close should be
2630 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2631 new posix_spawn implementation
2632 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2633 leads to lower CPU frequency
2634 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2635 [21261] libc: [sparc64] bits/setjmp.h namespace
2636 [21267] network: [mips] bits/socket.h IOC* namespace
2637 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2638 [21270] libc: mmap64 silently truncates large offset values
2639 [21275] libc: posix_spawn always crashes on ia64 now
2640 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2641 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2642 [21289] libc: Incorrect declaration for 32-bit platforms with
2643 _FILE_OFFSET_BITS=64 causes build error
2644 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2645 not support gethostbyname4_r
2646 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2648 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2650 [21340] libc: Support POSIX_SPAWN_SETSID
2651 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2652 [21359] network: ns_name_pack needs additional byte in destination buffer
2653 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2654 against fragmentation attacks (CVE-2017-12132)
2655 [21369] network: resolv: Remove EDNS fallback
2656 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2658 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2659 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2660 [21393] stdio: Missing dup3 error check in freopen, freopen64
2661 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2662 [21399] localedata: Bad description for U00EC in
2663 localedata/charmaps/CP1254
2664 [21411] malloc: realloc documentation error
2665 [21426] network: sys/socket.h uio.h namespace
2666 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2667 [21445] libc: signal.h bsd_signal namespace
2668 [21455] network: Network headers stdint.h namespace
2669 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2671 [21475] network: resolv: Overlong search path is truncated mid-label
2672 [21511] libc: sigstack namespace
2673 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2674 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2675 bits/syscall.h: No such file or directory
2676 [21517] libc: struct sigaltstack namespace
2677 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2678 [21533] localedata: Update locale data to Unicode 10.0
2680 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2681 junk at end of line, first unrecognized character is `@'
2682 [21538] libc: SIG_HOLD missing for XPG4
2683 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2684 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2685 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2686 [21543] libc: sigevent namespace
2687 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2688 size for general purpose registers in mcontext_t structure
2689 [21550] libc: sigwait namespace
2690 [21552] libc: XPG4 bsd_signal namespace
2691 [21554] libc: sigpause namespace
2692 [21560] libc: sys/wait.h signal.h namespace
2693 [21561] libc: waitid namespace
2694 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2695 '/usr/include/stdlib.h': Permission denied
2696 [21575] libc: sys/wait.h missing struct rusage definition
2697 [21584] libc: sigaltstack etc namespace
2698 [21597] libc: siginterrupt namespace
2699 [21607] math: hppa: FAIL: math/test-tgmath
2700 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2702 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2703 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2704 stack and heap (CVE-2017-1000366)
2705 [21625] libc: wait3 namespace
2706 [21654] nss: Incorrect pointer alignment in NSS group merge result
2708 [21657] network: Parse interface zone id for node-local multicast
2709 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2711 [21666] libc: .symver is used on common symbol
2712 [21668] network: resolv: res_init cross-thread broadcast introduces race
2714 [21687] math: tgmath.h totalorder, totalordermag return type
2715 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2717 [21696] libc: Incorrect assumption of of __cpu_mask in
2718 posix/sched_cpucount.c
2719 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2720 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2722 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2723 leading to relocation crash
2724 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2725 `resolv_conf_matches (resp, conf)' failed.
2726 [21710] localedata: Added Samoan language locale for Samoa
2727 [21711] localedata: Pashto yesstr/nostr locale are missing
2728 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2729 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2730 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2731 [21723] localedata: yesstr/nostr missing for Chinese language locale
2732 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2734 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2736 [21728] localedata: New Locale for Tongan language
2737 [21729] localedata: incorrect LC_NAME fields for hi_IN
2738 [21733] localedata: yesstr and nostr are missing for zh_HK
2739 [21734] localedata: Missing yesstr and nostr are for kw_GB
2740 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2741 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2742 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2743 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2745 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2747 [21749] localedata: Wrong abbreviated day name (“abday”) for
2749 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2750 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2751 [21759] localedata: missing yesstr and nostr for Tigrinya
2752 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2753 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2754 [21767] localedata: Missing Bislama locales
2755 [21768] localedata: Missing yesstr and nostr for aa_ET
2756 [21770] localedata: Missing Field in li_NL
2757 [21778] nptl: Robust mutex may deadlock
2758 [21779] libc: MicroBlaze segfaults when loading libpthread
2759 [21783] localedata: Fix int_select international_call_prefixes
2760 [21784] localedata: Inconsistency in country_isbn
2761 [21788] localedata: Missing Country Postal Abbreviations
2762 [21794] localedata: Added-country_isbn-for-Italy
2763 [21795] localedata: Add/Fix country_isbn for France
2764 [21796] localedata: Added country_isbn for Republic of Korea
2765 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2766 [21799] localedata: Added int_select international_call_prefixes
2767 [21801] localedata: Added int_select international_call_prefixes
2768 [21804] nptl: Double semicolon in thread-shared-types.h
2769 [21807] localedata: LC_ADDRESS fix for pap_CW
2770 [21808] localedata: Fix LC_ADDRESS for pap_AW
2771 [21821] localedata: Added country_name in mai_IN
2772 [21822] localedata: Fix LC_TIME for mai_IN
2773 [21823] localedata: missing yesstr, nostr for sa_IN
2774 [21825] localedata: Fix name_mrs for mag_IN
2775 [21828] localedata: 2.26 changelog should mention user visible changes
2777 [21835] localedata: Added Maithili language locale for Nepal
2778 [21838] localedata: Removed redundant data for the_NP
2779 [21839] localedata: Fix LC_MONETARY for ta_LK
2780 [21844] localedata: Fix Latin characters and Months Sequence.
2781 [21848] localedata: Fix mai_NP Title Name
2786 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2787 24731-2:2010, is supported to enable declarations of functions from that
2788 TR. Note that not all functions from that TR are supported by the GNU C
2791 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2792 18661-1:2014, is supported to enable declarations of functions and macros
2793 from that TS. Note that not all features from that TS are supported by
2796 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2797 18661-4:2015, is supported to enable declarations of functions and macros
2798 from that TS. Note that most features from that TS are not supported by
2801 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2802 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2803 Since the GNU C Library defaults to a much newer revision of POSIX, this
2804 will only affect programs that specifically request an old conformance
2805 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2806 see a change in the visible declarations, but a program compiled with
2807 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2810 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2811 defined by all multithreaded code, but glibc has not required this for
2814 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2815 means that in a future release, the macros “major”, “minor”, and “makedev”
2816 will only be available from <sys/sysmacros.h>.
2818 These macros are not part of POSIX nor XSI, and their names frequently
2819 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2820 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2821 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2824 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2825 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2826 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2828 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2829 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2830 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2831 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2832 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2833 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2834 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2835 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2836 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2837 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2838 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2841 * New <math.h> features are added from TS 18661-1:2014:
2843 - Signaling NaN macros: SNANF, SNAN, SNANL.
2845 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2846 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2847 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2849 - llogb functions: the llogb, llogbf and llogbl functions, and the
2850 FP_LLOGB0 and FP_LLOGBNAN macros.
2852 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2855 - Comparison macros: iseqsig.
2857 - Classification macros: iscanonical, issubnormal, iszero.
2859 - Total order functions: totalorder, totalorderf, totalorderl,
2860 totalordermag, totalordermagf, totalordermagl.
2862 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2864 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2865 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2867 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2868 are added to libc. They convert a floating-point number into string.
2870 * Most of glibc can now be built with the stack smashing protector enabled.
2871 It is recommended to build glibc with --enable-stack-protector=strong.
2872 Implemented by Nick Alcock (Oracle).
2874 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2875 intended to be used instead of memset() to erase sensitive data after use;
2876 the compiler will not optimize out calls to explicit_bzero even if they
2877 are "unnecessary" (in the sense that no _correct_ program can observe the
2878 effects of the memory clear).
2880 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2881 to float instead of double. This does not affect the ABI of any libraries
2882 that are part of the GNU C Library, but may affect the ABI of other
2883 libraries that use this type in their interfaces.
2885 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2886 float_t and double_t types are now defined to long double instead of float
2887 and double. These options are not the default, and this does not affect
2888 the ABI of any libraries that are part of the GNU C Library, but it may
2889 affect the ABI of other libraries that use this type in their interfaces,
2890 if they are compiled or used with those options.
2892 * The getentropy and getrandom functions, and the <sys/random.h> header file
2895 * The buffer size for byte-oriented stdio streams is now limited to 8192
2896 bytes by default. Previously, on Linux, the default buffer size on most
2897 file systems was 4096 bytes (and thus remains unchanged), except on
2898 network file systems, where the buffer size was unpredictable and could be
2899 as large as several megabytes.
2901 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2902 for the Linux quota interface which predates kernel version 2.4.22 has
2905 * The malloc_get_state and malloc_set_state functions have been removed.
2906 Already-existing binaries that dynamically link to these functions will
2907 get a hidden implementation in which malloc_get_state is a stub. As far
2908 as we know, these functions are used only by GNU Emacs and this change
2909 will not adversely affect already-built Emacs executables. Any undumped
2910 Emacs executables, which normally exist only during an Emacs build, should
2911 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2913 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2914 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2915 “no-ip6-dotint” had already been the default, and support for the
2916 “ip6-dotint” option was removed from the Internet in 2006.
2918 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2919 flag from <resolv.h> have been removed. The option relied on a
2920 backwards-incompatible DNS extension which was never deployed on the
2923 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2924 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2925 They were already unimplemented.
2927 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2928 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2929 removed again from the IETF name lookup interface specification in RFC
2930 2553. Applications should use getaddrinfo instead.
2932 * DNSSEC-related declarations and definitions have been removed from the
2933 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2934 decode the data part of DNSSEC record types. Previous versions of glibc
2935 only implemented minimal support for the previous version of DNSSEC, which
2936 is incompatible with the currently deployed version.
2938 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2939 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2940 <arpa/nameser.h> header file because the distinction between RR types and
2941 meta-RR types is not officially standardized, subject to revision, and
2942 thus not suitable for encoding in a macro.
2944 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2945 and rhook members of the res_state type in <resolv.h> have been removed.
2946 The glibc stub resolver did not support these hooks, but the header file
2947 did not reflect that.
2949 * For multi-arch support it is recommended to use a GCC which has
2950 been built with support for GNU indirect functions. This ensures
2951 that correct debugging information is generated for functions
2952 selected by IFUNC resolvers. This support can either be enabled by
2953 configuring GCC with '--enable-gnu-indirect-function', or by
2954 enabling it by default by setting 'default_gnu_indirect_function'
2955 variable for a particular architecture in the GCC source file
2958 * GDB pretty printers have been added for mutex and condition variable
2959 structures in POSIX Threads. When installed and loaded in gdb these pretty
2960 printers show various pthread variables in human-readable form when read
2961 using the 'print' or 'display' commands in gdb.
2963 * Tunables feature added to allow tweaking of the runtime for an application
2964 program. This feature can be enabled with the '--enable-tunables' configure
2965 flag. The GNU C Library manual has details on usage and README.tunables has
2966 instructions on adding new tunables to the library.
2968 * A new version of condition variables functions have been implemented in
2969 the NPTL implementation of POSIX Threads to provide stronger ordering
2972 * A new version of pthread_rwlock functions have been implemented to use a more
2973 scalable algorithm primarily through not using a critical section anymore to
2976 Security related changes:
2978 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2979 have been created with makecontext could fail to terminate due to a
2980 missing .cantunwind annotation. This has been observed to lead to a hang
2981 (denial of service) in some Go applications compiled with gccgo. Reported
2982 by Andreas Schwab. (CVE-2016-6323)
2984 * The DNS stub resolver functions would crash due to a NULL pointer
2985 dereference when processing a query with a valid DNS question type which
2986 was used internally in the implementation. The stub resolver now uses a
2987 question type which is outside the range of valid question type values.
2990 The following bugs are resolved with this release:
2992 [4099] stdio: Overly aggressive caching by stream i/o functions.
2993 [7065] build: Support building glibc with -fstack-protector or -fstack-
2995 [9842] localedata: en_CA: incorrect date format
2996 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2997 before it started waiting
2998 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2999 [15765] nptl: sem_open is wrongly a cancellation point
3000 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3001 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3003 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3004 library linked with pthread
3005 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3006 "FIXME: Ingo" issue)
3007 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3008 [17252] libc: getrandom and getentropy syscall
3009 [17730] malloc: thread-local storage is sometimes improperly free()'d
3010 after being __libc_memalign()'d
3011 [18241] stdio: failed fseek on memstream does not set errno and can fail
3013 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3015 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3016 PTHREAD_PRIO_INHERIT mutex on ARM
3017 [18784] network: res_query and related function crash for special record
3018 type queries (CVE-2015-5180)
3019 [19380] math: strtod does not raise "inexact"
3020 [19387] string: Integer overflow in memchr
3021 [19390] string: Integer overflow in strncat
3022 [19398] build: linknamespace tests fail with massively parallel build
3023 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3025 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3026 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3027 [19514] libc: [PATCH] Fix spelling errors in spelling
3028 "implement"/"implementation" in several places
3029 [19582] network: Deprecate RES_USE_INET6
3030 [19673] manual: clog10 docs appear to be erroneous
3031 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3032 causes a segmentation fault
3033 [19826] libc: invalid pointer returned from __tls_get_addr with static
3035 [20016] network: resolv: Remove hooks support from the API
3036 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3038 [20033] math: [x86_64] vectorized math function don't call the __finite
3040 [20116] nptl: use after free in pthread_create
3041 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3042 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3044 [20311] nptl: please install proc_service.h
3045 [20366] libc: Compilation errors in installed headers in strict-compliance
3047 [20370] malloc: malloc: Arena free list management is still racy
3048 (incorrect fix in bug 19243)
3049 [20386] libc: assert (X = 0) does not result in GCC warning
3050 [20432] malloc: malloc: Minimize interface required for interposition
3051 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3052 in _Unwind_Backtrace (CVE-2016-6323)
3053 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3054 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3056 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3057 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3058 [20477] network: resolv: incorrect double-checked locking related to
3060 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3062 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3064 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3065 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3066 cause transition penalty
3067 [20517] math: sparcv9 missing fdiml compat symbol
3068 [20524] manual: strverscmp is inconsistent
3069 [20525] libc: <sys/quota.h> should be based on kernel headers
3070 [20539] math: GCC 7 -static -lm fails to link at -O3
3071 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3073 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3075 [20591] network: Remove obsolete DNSSEC support
3076 [20592] network: DNS resource record type classification macros in
3077 <arpa/nameser.h> are incorrect
3078 [20593] network: Update DNS RR type definitions
3079 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3080 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3082 [20629] network: libresolv: Remove support for bitstring labels
3084 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3085 assertion: "maxidx >= 2"
3086 [20660] math: [arm] Use VSQRT
3087 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3088 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3089 [20689] libc: Test for FMA should also check for AVX.
3090 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3091 [20715] math: iszero macro breaks existing code
3092 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3093 [20728] libc: powerpc: Missing TOC stub in clone
3094 [20729] build: glibc-2.24 fails to build for i486 with -Os
3095 [20750] build: Build fails with default PIE enabled gcc-6.x
3096 [20768] math: [alpha] sqrt fegetenv namespace
3097 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3099 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3100 __FLT_EVAL_METHOD__ is 2
3101 [20790] network: rpcgen buffer overrun in get_prog_declaration
3102 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3103 [20829] libc: crypt snprintf namespace
3104 [20847] libc: tst-vfork3 failure
3105 [20855] math: Default bits/mathdef.h has inappropriate float_t
3106 [20859] math: [sh4] FP_ILOGB0 invalid
3107 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3108 U+20AC), not same as GBK
3109 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3110 [20916] math: pow handling of sNaN arguments
3111 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3112 [20919] math: Bad pow (qNaN, 0) result with -lieee
3113 [20940] math: hypot sNaN handling
3114 [20947] math: fmax, fmin sNaN handling
3115 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3116 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3118 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3119 [20973] nptl: robust mutexes: Lost wake-ups
3120 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3121 [20978] nis: strlen on null pointer in nss_nisplus
3122 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3124 [21014] string: i686 memchr overflows internal pointer check
3125 [21019] libc: [mips] n32 lseek incorrect on overflow
3126 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3127 [21026] libc: [MIPS] readahead syscall is broken on n64
3128 [21028] math: Fallback fesetexceptflag should always succeed
3129 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3130 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3132 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3133 [21061] librt: [microblaze] librt lost clock_* exports
3134 [21073] libc: tunables: insecure environment variables passed to
3135 subprocesses with AT_SECURE
3136 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3140 * The minimum Linux kernel version that this version of the GNU C Library
3141 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3142 kernel version 2.6.32 or later suffices (on architectures that already
3143 required kernel versions more recent than 3.2, those requirements remain
3144 unchanged). Linux 3.2 or later kernel headers are required on all
3147 * The pap_AN locale has been deleted. This has been deprecated for a long
3148 time. It has been replaced by pap_AW & pap_CW, both of which have long
3149 been included in previous releases.
3151 * The readdir_r and readdir64_r functions have been deprecated. It is
3152 recommended to use readdir and readdir64 instead.
3154 * The type “union wait” has been removed. It was deprecated in the early
3155 1990s and never part of POSIX. Application code should use the int type
3156 instead of “union wait”.
3158 * A new NSS action is added to facilitate large distributed system
3159 administration. The action, MERGE, allows remote user stores like LDAP
3160 to be merged into local user stores like /etc/groups in order to provide
3161 easy to use, updated, and managed sets of merged credentials. The new
3162 action can be used by configuring it in /etc/nsswitch.conf:
3163 group: files [SUCCESS=merge] nis
3164 Implemented by Stephen Gallagher (Red Hat).
3166 * The deprecated __malloc_initialize_hook variable has been removed from the
3169 * The long unused localedef --old-style option has been removed. It hasn't
3170 done anything in over 16 years. Scripts using this option can safely
3173 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3174 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3175 return the next representable value in the direction of positive infinity
3176 and the nextdown functions return the next representable value in the
3177 direction of negative infinity. These are currently enabled as GNU
3180 Security related changes:
3182 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3183 could result in a stack overflow when getnetbyname was called with an
3184 overly long name. (CVE-2016-3075)
3186 * Previously, getaddrinfo copied large amounts of address data to the stack,
3187 even after the fix for CVE-2013-4458 has been applied, potentially
3188 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3189 instead. Reported by Michael Petlan. (CVE-2016-3706)
3191 * The glob function suffered from a stack-based buffer overflow when it was
3192 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3193 Reported by Alexander Cherepanov. (CVE-2016-1234)
3195 * The Sun RPC UDP client could exhaust all available stack space when
3196 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3197 alloca plugin for GCC. (CVE-2016-4429)
3199 * The IPv6 name server management code in libresolv could result in a memory
3200 leak for each thread which is created, performs a failing naming lookup,
3201 and exits. Over time, this could result in a denial of service due to
3202 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3204 The following bugs are resolved with this release:
3206 [1170] localedata: ne_NP: update Nepali locale definition file
3207 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3209 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3210 [6796] math: fdim() does not set errno on overflow
3211 [10354] libc: posix_spawn should use vfork() in more cases than presently
3212 [11213] localedata: localedata: add copyright disclaimer to locale files
3213 [12143] localedata: chr_US: new Cherokee locale
3214 [12450] localedata: sgs_LT: new locale
3215 [12676] localedata: ln_CD: new locale
3216 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3218 [13304] math: fma, fmaf, fmal produce wrong results
3219 [14259] build: --localedir arg to configure is ignored
3220 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3221 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3222 [14934] localedata: es_CL: wrong first weekday chilean locale
3223 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3225 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3227 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3228 [15368] nptl: raise() is not async-signal-safe
3229 [15479] math: ceil, floor, round and trunc raise inexact exception
3230 [15578] localedata: kk_KZ: various updates
3231 [16003] localedata: pap_AN: punt old locale
3232 [16137] localedata: iw_IL: punt old locale
3233 [16190] localedata: eo: new esperanto locale
3234 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3235 [16742] malloc: race condition: pthread_atfork() called before first
3236 malloc() results in unexpected locking behaviour/deadlocks
3237 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3239 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3240 [17565] localedata: pt_PT: wrong (work-)week start
3241 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3242 [17950] build: Build fails with -msse
3243 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3244 [18433] libc: posix_spawn does not return correctly upon failure to
3246 [18453] localedata: charmaps/IBM875: incorrect codes
3247 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3249 [18896] localedata: he_IL: improvements for currency
3250 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3251 Romanian locale data
3252 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3254 [19056] libc: Deprecate readdir_r
3255 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3257 [19198] localedata: nl_NL: small improvements for Dutch locales
3258 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3259 nameservers (CVE-2016-5417)
3260 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3262 [19400] locale: Language missing in "iso-639.def", trivial fix in
3264 [19431] malloc: Deadlock between fflush, getdelim, and fork
3265 [19505] libc: Incorrect file descriptor validity checks in
3266 posix_spawn_file_actions_add{open,close,dup2}
3267 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3268 when using RTLD_NEXT
3269 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3270 `intl/{gettextP,loadinfo}.h'
3271 [19534] libc: execle, execlp may use malloc
3272 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3273 [19573] network: res_nclose and __res_maybe_init disagree about name
3274 server initialization, breaking Hesiod
3275 [19575] localedata: Status of GB18030 tables
3276 [19581] localedata: sr_* date_fmt string contains additional newline
3277 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3279 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3280 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3281 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3282 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3284 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3286 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3288 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3289 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3290 [19633] locale: strfmon_l applies global locale to number formatting
3291 [19642] network: Memory leak in getnameinfo
3292 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3293 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3295 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3296 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3298 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3299 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3301 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3303 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3305 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3306 pointers and lengths in error-case.
3307 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3308 report errors on UTF-16 surrogates values.
3309 [19755] nscd: nscd assertion failure in gc
3310 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3311 [19759] libc: mempcpy shouldn't be inlined
3312 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3313 [19765] libc: s390 needs an optimized mempcpy
3314 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3315 NAME_MAX limit assumption (CVE-2016-1234)
3316 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3317 [19787] network: Missing and incorrect truncation checks in getnameinfo
3318 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3320 [19791] network: Assertion failure in res_query.c with un-connectable name
3322 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3323 [19822] math: libm.so install clobbers old version
3324 [19825] network: resolv: send_vc can return uninitialized data in second
3325 response to getaddrinfo
3326 [19830] network: nss_dns: should check RDATA length against buffer length
3327 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3328 confronted with A/AAAA records of invalid size
3329 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3330 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3331 [19853] stdio: Printing IBM long double in decimal with high precision is
3333 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3334 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3335 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3337 [19865] network: Assertion failure or memory leak in
3338 _nss_dns_getcanonname_r
3339 [19868] network: nss_dns: netent code does not skip over non-PTR records
3340 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3342 [19881] string: Improve x86-64 memset
3343 [19907] string: Incorrect memcpy tests
3344 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3346 [19925] libc: termios.h XCASE namespace
3347 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3348 [19929] libc: limits.h NL_NMAX namespace
3349 [19931] stdio: Memory leak in vfprintf
3350 [19957] libc: clone(CLONE_VM) access invalid parent memory
3351 [19963] localedata: en_IL: New locale
3352 [19989] stdio: stdio.h cuserid namespace
3353 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3355 [19996] locale: langinfo.h nl_langinfo_l namespace
3356 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3357 [20010] network: getaddrinfo: Stack overflow in hostent translation
3359 [20012] stdio: libio: fmemopen append mode failure
3360 [20014] stdio: stdio.h namespace for pre-threads POSIX
3361 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3362 [20023] libc: fcntl.h timespec namespace
3363 [20024] math: [x86_64] vectorized sincos trashes the stack
3364 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3365 [20041] time: sys/time.h timespec namespace
3366 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3367 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3368 [20051] libc: ttyslot in wrong header under wrong conditions
3369 [20054] libc: gethostname not declared for XPG4
3370 [20055] libc: termios.h missing tcgetsid for XPG4
3371 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3373 [20073] libc: sys/stat.h fchmod namespace
3374 [20074] libc: stdlib.h rand_r namespace
3375 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3376 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3378 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3379 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3381 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3382 [20119] libc: Wrong mask for processors level type from CPUID
3383 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3384 AS not supporting AVX512
3385 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3387 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3388 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3390 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3391 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3392 [20178] libc: posix_spawn{p} should not call exit
3393 [20191] stdio: libio: vtables hardening
3394 [20195] string: FMA4 detection requires CPUID execution with register
3396 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3397 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3399 [20212] math: acos (sNaN) returns sNaN
3400 [20213] math: asin (sNaN) returns sNaN
3401 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3402 [20218] math: [i386] asinhl (sNaN) returns sNaN
3403 [20219] math: [i386] atanhl (sNaN) returns sNaN
3404 [20222] stdio: fopencookie: Mangle function pointers
3405 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3406 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3407 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3409 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3410 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3411 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3412 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3413 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3414 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3415 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3416 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3417 [20240] math: modf (sNaN) returns sNaN
3418 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3419 [20250] math: frexp (sNaN) returns sNaN
3420 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3421 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3423 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3424 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3425 subscript is below array bounds [-Werror=array-bounds]
3426 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3427 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3429 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3430 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3432 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3433 "invalid" exceptions
3434 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3435 [20316] localedata: id_ID: Februari instead of Pebruari
3436 [20327] string: POWER8 strcasecmp returns incorrect result
3437 [20347] math: Failure: Test: j0_downward (0xap+0)
3438 [20348] libc: FAIL: misc/tst-preadvwritev64
3439 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3440 [20350] libc: There is no test for p{read,write}64
3441 [20357] math: Incorrect cos result for 1.5174239687223976
3442 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3446 * Unicode 8.0.0 Support: Character encoding, character type info, and
3447 transliteration tables are all updated to Unicode 8.0.0, using new
3448 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3449 These updates cause user visible changes, such as the fixes for bugs
3450 89, 16061, and 18568.
3452 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3453 kernel-internal CPU set size. This means that requests that change the
3454 CPU affinity which failed before (for example, an all-ones CPU mask) will
3455 now succeed. Applications that need to determine the effective CPU
3456 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3457 setting it because the kernel can adjust it (and the previous size check
3458 would not detect this in the majority of cases).
3460 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3461 the following new symbols are used: fts64_children, fts64_close,
3462 fts64_open, fts64_read and fts64_set.
3464 * getaddrinfo now detects certain invalid responses on an internal netlink
3465 socket. If such responses are received, an affected process will
3466 terminate with an error message of "Unexpected error <number> on netlink
3467 descriptor <number>" or "Unexpected netlink response of size <number> on
3468 descriptor <number>". The most likely cause for these errors is a
3469 multi-threaded application which erroneously closes and reuses the netlink
3470 file descriptor while it is used by getaddrinfo.
3472 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3473 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3474 unnecessary serialization of memory allocation requests across threads.
3475 The defect is now corrected. Users should see a substantial increase in
3476 the concurent throughput of allocation requests for applications which
3477 trigger this bug. Affected applications typically create and
3478 destroy threads frequently. (Bug 19048 was reported and analyzed by
3481 * There is now a --disable-timezone-tools configure option for disabling the
3482 building and installing of the timezone related utilities (zic, zdump, and
3483 tzselect). This is useful for people who build the timezone data and code
3484 independent of the GNU C Library.
3486 * The obsolete header <regexp.h> has been removed. Programs that require
3487 this header must be updated to use <regex.h> instead.
3489 * The obsolete functions bdflush, create_module, get_kernel_syms,
3490 query_module and uselib are no longer available to newly linked binaries;
3491 the header <sys/kdaemon.h> has been removed. These functions and header
3492 were specific to systems using the Linux kernel and could not usefully be
3493 used with the GNU C Library on systems with version 2.6 or later of the
3496 * Optimized string, wcsmbs and memory functions for IBM z13.
3497 Implemented by Stefan Liebler.
3499 * Newly linked programs that define a variable called signgam will no longer
3500 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3501 require signgam to be set by those functions must ensure that they use the
3502 variable provided by the GNU C Library and declared in <math.h>, without
3503 defining their own copy.
3505 * The minimum GCC version that can be used to build this version of the GNU
3506 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3507 still be used to compile programs using the GNU C Library.
3509 Security related changes:
3511 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3512 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3514 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3515 the pointer guard feature. It is always enabled. Previously,
3516 LD_POINTER_GUARD could be used to disable security hardening in binaries
3517 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3520 * An integer overflow in hcreate and hcreate_r could lead to an
3521 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3523 * The catopen function no longer has unbounded stack usage. Reported by
3524 Max. (CVE-2015-8779)
3526 * The nan, nanf and nanl functions no longer have unbounded stack usage
3527 depending on the length of the string passed as an argument to the
3528 functions. Reported by Joseph Myers. (CVE-2014-9761)
3530 * A stack-based buffer overflow was found in libresolv when invoked from
3531 libnss_dns, allowing specially crafted DNS responses to seize control
3532 of execution flow in the DNS client. The buffer overflow occurs in
3533 the functions send_dg (send datagram) and send_vc (send TCP) for the
3534 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3535 family. The use of AF_UNSPEC triggers the low-level resolver code to
3536 send out two parallel queries for A and AAAA. A mismanagement of the
3537 buffers used for those queries could result in the response of a query
3538 writing beyond the alloca allocated buffer created by
3539 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3540 the overflow. Thanks to the Google Security Team and Red Hat for
3541 reporting the security impact of this issue, and Robert Holiday of
3542 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3544 The following bugs are resolved with this release:
3546 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3547 [887] math: Math library function "logb" and "nextafter" inconsistent
3548 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3549 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3550 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3551 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3553 [4404] localedata: German translation of "Alarm clock" is misleading
3554 [6799] math: nextafter() and nexttoward() doen't set errno on
3555 overflow/underflow errors
3556 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3558 [10432] nis: _nss_nis_setnetgrent assertion failure
3559 [11460] libc: fts has no LFS support
3560 [12926] network: getaddrinfo()/make_request() may spin forever
3561 [13065] nptl: Race condition in pthread barriers
3562 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3563 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3565 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3566 [14912] libc: Rename non-installed bits/*.h headers
3567 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3568 [15367] math: Let gcc use __builtin_isinf
3569 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3570 [15421] math: lgamma wrongly sets signgam for ISO C
3571 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3572 FE_INVALID with argument out of range
3573 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3575 [15786] dynamic-link: ifunc resolver functions can smash function
3577 [15918] math: Unnecessary check for equality in hypotf()
3578 [16061] localedata: Review / update transliteration data
3579 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3581 [16141] time: strptime %z offset restriction
3582 [16171] math: drem should be alias of remainder
3583 [16296] math: fegetround is pure?
3584 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3585 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3587 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3588 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3590 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3591 "Exception "Inexact" set" on ppc32
3592 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3593 [16517] math: Missing underflow exception from tanf/tan/tanl
3594 [16519] math: Missing underflow exception from sinhf
3595 [16520] math: Missing underflow exception from tanhf
3596 [16521] math: Missing underflow exception from exp2
3597 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3599 [16734] stdio: fopen calls mmap to allocate its buffer
3600 [16961] math: nan function incorrect handling of bad sequences
3601 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3602 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3603 [16985] locale: localedef: confusing error message when opening output
3605 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3606 [17197] locale: Redundant shift character in iconv conversion output at
3608 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3609 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3610 [17250] dynamic-link: static linking breaks nss loading
3611 (getaddrinfo/getpwnam/etc...)
3612 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3614 [17441] math: isnan() should use __builtin_isnan() in GCC
3615 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3616 (related to lock elision)
3617 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3618 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3619 [17887] time: strptime should be able to parse "+01:00" style timezones
3620 [17905] libc: catopen() Multiple unbounded stack allocations
3622 [18084] libc: backtrace (..., 0) dumps core on x86
3623 [18086] libc: nice() sets errno to 0 on success
3624 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3625 is too large (CVE-2015-8778)
3626 [18251] dynamic-link: SONAME missing when audit modules provides path
3627 [18265] libc: add attributes for wchar string and memory functions
3628 [18370] math: csqrt missing underflows
3629 [18421] libc: [hppa] read-only segment has dynamic relocations
3630 [18472] libc: Obsolete syscall wrappers should be compat symbols
3631 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3632 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3633 [18525] localedata: Remove locale timezone information
3634 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3635 [18568] localedata: Update locale data to Unicode 8.0
3636 [18589] locale: sort-test.sh fails at random
3637 [18595] math: ctan, ctanh missing underflows
3638 [18604] libc: assert macro-expands its argument
3639 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3640 contains a vector instruction exception.
3641 [18611] math: j1, jn missing errno setting on underflow
3642 [18618] localedata: sync Chechen locale definitions with other *_RU
3644 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3645 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3646 [18665] network: In send_dg, the recvfrom function is NOT always using the
3647 buffer size of a newly created buffer (CVE-2015-7547)
3648 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3650 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3652 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3653 [18699] math: tilegx cproj() for various complex infinities does not yield
3655 [18724] libc: Harden put*ent functions against data injection
3656 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3657 [18755] build: build errors with -DNDEBUG
3658 [18757] stdio: fmemopen fails to set errno on failure
3659 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3661 [18781] libc: openat64 lacks O_LARGEFILE
3662 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3663 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3664 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3665 [18790] math: [ldbl-128ibm] tanhl inaccurate
3666 [18795] libc: stpncpy fortification misses buffer lengths that are
3667 statically too large
3668 [18796] build: build fails for --disable-mathvec
3669 [18803] math: hypot missing underflows
3670 [18820] stdio: fmemopen may leak memory on failure
3671 [18823] math: csqrt spurious underflows
3672 [18824] math: fma spurious underflows
3673 [18825] math: pow missing underflows
3674 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3675 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3676 [18870] build: sem_open.c fails to compile with missing symbol
3678 [18872] stdio: Fix memory leak in printf_positional
3679 [18873] libc: posix_fallocate overflow check ineffective
3680 [18875] math: Excess precision leads incorrect libm
3681 [18877] libc: arm: mmap offset regression
3682 [18887] libc: memory corruption when using getmntent on blank lines
3683 [18918] localedata: hu_HU: change time to HH:MM:SS format
3684 [18921] libc: Regression: extraneous stat() and fstat() performed by
3686 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3687 binaries (CVE-2015-8777)
3688 [18951] math: tgamma missing underflows
3689 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3691 [18953] localedata: lt_LT: change currency symbol to the euro
3692 [18956] math: powf inaccuracy
3693 [18961] math: [i386] exp missing underflows
3694 [18966] math: [i386] exp10 missing underflows
3695 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3696 [18969] build: multiple string test failures due to missing locale
3698 [18970] libc: Reference of pthread_setcancelstate in libc.a
3699 [18977] math: float / long double Bessel functions not in XSI POSIX
3700 [18980] math: i386 libm functions return with excess range and precision
3701 [18981] math: i386 scalb*, ldexp return with excess range and precision
3702 [18982] stdio: va_list and vprintf
3703 [18985] time: Passing out of range data to strftime() causes a segfault
3705 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3706 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3707 [19012] locale: iconv_open leaks memory on error path
3708 [19016] math: clog, clog10 inaccuracy
3709 [19018] nptl: Mangle function pointers in tls_dtor_list
3710 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3711 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3712 [19048] malloc: malloc: arena free list can become cyclic, increasing
3714 [19049] math: [powerpc] erfc incorrect zero sign
3715 [19050] math: [powerpc] log* incorrect zero sign
3716 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3717 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3718 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3719 [19074] network: Data race in _res_hconf_reorder_addrs
3720 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3721 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3722 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3724 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3726 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3727 [19086] manual: posix_fallocate64 documented argument order is wrong.
3728 [19088] math: lround, llround missing exceptions close to overflow
3730 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3731 [19095] math: dbl-64 lrint incorrect for 64-bit long
3732 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3733 [19124] dynamic-link: ld.so failed to build with older assmebler
3734 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3735 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3736 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3737 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3738 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3739 pthread_setaffinity_np
3740 [19156] math: [ldbl-128] j0l spurious underflows
3741 [19164] nptl: tst-getcpu fails with many possible CPUs
3742 [19168] math: math/test-ildoubl and math/test-ldouble failure
3743 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3744 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3746 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3747 (FE_NOMASK_ENV) do not clear SSE exceptions
3748 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3749 _int_new_arena/reused_arena
3750 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3751 [19201] math: dbl-64 remainder incorrect sign of zero result
3752 [19205] math: bits/math-finite.h conditions do not match math.h and
3754 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3755 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3756 for C99-based standards
3757 [19212] libc: features.h not -Wundef clean
3758 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3760 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3761 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3762 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3764 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3765 "inexact" exceptions
3766 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3768 [19242] libc: strtol incorrect in Turkish locales
3769 [19243] malloc: reused_arena can pick an arena on the free list, leading
3770 to an assertion failure and reference count corruption
3771 [19253] time: tzset() ineffective when temporary TZ did not include DST
3773 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3774 [19270] math: [hppa] Shared libm missing __isnanl
3775 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3776 MAP_HUGETLB and MAP_STACK defines
3777 [19313] nptl: Wrong __cpu_mask for x32
3778 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3779 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3780 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3781 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3782 [19363] time: x32: times() return value wrongly truncates/sign extends
3784 [19367] dynamic-link: Improve branch prediction on Silvermont
3785 [19369] network: Default domain name not reset by res_ninit when "search"
3786 / "domain" entry is removed from resolv.conf
3787 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3789 [19385] localedata: bg_BG: time separator should be colon, not comma
3790 [19408] libc: linux personality syscall wrapper may erroneously return an
3791 error on 32-bit architectures
3792 [19415] libc: dladdr returns wrong names on hppa
3793 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3794 IBM905, IBM907, and IBM909
3795 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3796 [19443] build: build failures with -DDEBUG
3797 [19451] build: Make check fails on test-double-vlen2
3798 [19462] libc: Glibc failed to build with -Os
3799 [19465] math: Wrong code with -Os
3800 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3802 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3804 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3805 [19486] math: S390: Math tests fail with "Exception Inexact set".
3806 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3807 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3809 [19590] math: Fail to build shared objects that use libmvec.so functions.
3813 * The following bugs are resolved with this release:
3815 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3816 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3817 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3818 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3819 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3820 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3821 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3822 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3823 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3824 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3825 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3826 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3827 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3828 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3829 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3830 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3831 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3832 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3833 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3834 18657, 18676, 18694, 18696, 18887.
3836 * Cache information can be queried via sysconf() function on s390 e.g. with
3837 _SC_LEVEL1_ICACHE_SIZE as argument.
3839 * A buffer overflow in gethostbyname_r and related functions performing DNS
3840 requests has been fixed. If the NSS functions were called with a
3841 misaligned buffer, the buffer length change due to pointer alignment was
3842 not taken into account. This could result in application crashes or,
3843 potentially arbitrary code execution, using crafted, but syntactically
3844 valid DNS responses. (CVE-2015-1781)
3846 * The time zone file parser has been made more robust against crafted time
3847 zone files, avoiding heap buffer overflows related to the processing of
3848 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3849 large time zone data files. Overly long time zone specifiers in the TZ
3850 variable no longer result in stack overflows and crashes.
3852 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3853 for LD and GD on x86 and x86-64, has been implemented. You will need
3854 binutils-2.24 or later to enable this optimization.
3856 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3857 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3858 Hat). These updates cause user visible changes, such as the fix for bug
3861 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3862 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3863 condition in some applications.
3865 * Added vector math library named libmvec with the following vectorized x86_64
3866 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3868 The library can be disabled with --disable-mathvec. Use of the functions is
3869 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3870 Shared library libmvec.so is linked in as needed when using -lm (no need to
3871 specify -lmvec explicitly for not static builds).
3872 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3874 * A new fmemopen implementation has been added with the goal of POSIX
3875 compliance. The new implementation fixes the following long-standing
3876 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3877 old implementation is still present for use be by existing binaries.
3879 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3880 releases. It has been fixed to match 2.19 and older, but binaries built
3881 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3883 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3884 Contributed by Roland McGrath (Google).
3886 * The header <regexp.h> is deprecated, and will be removed in a future
3887 release. Use of this header will trigger a deprecation warning.
3888 Application developers should update their code to use <regex.h> instead.
3890 This header was formerly part of SUS, but was deprecated in 1994 and
3891 removed from the standard in 2001. Also, the glibc implementation
3892 leaks memory. See BZ#18681 for more details.
3896 * The following bugs are resolved with this release:
3898 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3899 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3900 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3901 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3902 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3903 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3904 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3905 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3906 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3907 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3910 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3911 too little memory for the to-be-scanned arguments and overflow the
3912 allocated buffer. The implementation now correctly computes the required
3913 buffer size when using malloc, and switches to malloc from alloca as
3916 * A new semaphore algorithm has been implemented in generic C code for all
3917 machines. Previous custom assembly implementations of semaphore were
3918 difficult to reason about or ensure that they were safe. The new version
3919 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3920 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3921 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3923 * Port to Altera Nios II has been contributed by Mentor Graphics.
3925 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3926 implementations for powerpc64/powerpc64le.
3927 Implemented by Adhemerval Zanella (IBM).
3929 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3930 and powerpc64le. This may improve lock scaling of existing programs on
3931 HTM capable systems. The lock elision code is only enabled with
3932 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3933 powerpc will issue a transaction abort on every syscall to avoid side
3934 effects being visible outside transactions.
3936 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3937 AArch64. Contributed by ARM Ltd.
3939 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3941 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3942 under certain input conditions resulting in the execution of a shell for
3943 command substitution when the application did not request it. The
3944 implementation now checks WRDE_NOCMD immediately before executing the
3945 shell and returns the error WRDE_CMDSUB as expected.
3947 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3948 processing format strings with a large number of format specifiers.
3950 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3951 infinite loop if the DNS response contained a PTR record of an unexpected
3954 * The minimum GCC version that can be used to build this version of the GNU
3955 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3956 still be used to compile programs using the GNU C Library.
3958 * The GNU C Library is now built with -Werror by default. This can be
3959 disabled by configuring with --disable-werror.
3961 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3963 * The obsolete sigvec function has been removed. This was the original
3964 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3965 programs have been using instead for about 25 years. Of course, ABI
3966 compatibility for old binaries using sigvec remains intact.
3968 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3969 with newer versions of bison.
3971 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3972 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3973 registers overlay two consecutive single-precision registers. MIPS32R2
3974 introduced a new FPU mode (FR=1) where double-precision registers extend the
3975 corresponding single-precision registers which is incompatible with the
3976 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3977 require the use of FR=1 making a transition necessary. New o32 ABI
3978 extensions enable users to migrate over time from the original o32 ABI
3979 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3980 tracks the ABI of any loaded object and verifies that new objects are
3981 compatible. Mode transitions will also be requested as required and
3982 unsupportable objects will be rejected. The ABI checks include both soft and
3983 hard float ABIs for o32, n32 and n64.
3985 GCC 5 with GNU binutils 2.25 onwards:
3986 It is strongly recommended that all o32 system libraries are built using the
3987 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3988 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3989 compiler using --with-fp-32=xx to set this by default.
3993 * The following bugs are resolved with this release:
3995 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3996 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3997 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3998 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3999 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4000 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4001 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4002 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4003 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4004 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4005 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4006 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4007 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4008 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4009 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4011 * Reverted change of ABI data structures for s390 and s390x:
4012 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4013 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4014 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4015 are preserved pointing straight to the same implementation as the old ones.
4016 Given that, new callers will simply provide a too-big buffer to these
4017 functions. Any applications/libraries out there that embed jmp_buf or
4018 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4019 against 2.19 headers will have to rebuilt again. This is necessary in any
4020 case to revert the breakage in their ABI caused by the glibc change.
4022 * Support for file description locks is added to systems running the
4023 Linux kernel. The standard file locking interfaces are extended to
4024 operate on file descriptions, not file descriptors, via the use of
4025 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4026 are associated with an open file instead of a process.
4028 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4030 * The minimum Linux kernel version that this version of the GNU C Library
4031 can be used with is 2.6.32.
4033 * Running the testsuite no longer terminates as soon as a test fails.
4034 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4035 with PASS or FAIL lines for individual tests. A summary of the results is
4036 printed, including a list of failing lists, and "make check" exits with
4037 error status if there were any unexpected failures. "make check
4038 stop-on-test-failure=y" may be used to keep the old behavior.
4040 * The am33 port, which had not worked for several years, has been removed
4043 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4044 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4045 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4046 conflicted with POSIX (support for which was removed in 2.19), the
4047 interfaces those macros enabled remain available when compiling with
4048 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4049 test macros defined.
4051 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4053 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4054 This may improve lock scaling of existing programs on TX capable systems.
4055 The lock elision code is only built with --enable-lock-elision=yes and
4056 then requires a GCC version supporting the TX builtins. With lock elision
4057 default mutexes are elided via __builtin_tbegin, if the cpu supports
4058 transactions. By default lock elision is not enabled and the elision code
4061 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4062 copy the path argument. This allowed programs to cause posix_spawn to
4063 deference a dangling pointer, or use an unexpected pathname argument if
4064 the string was modified after the posix_spawn_file_actions_addopen
4067 * All supported architectures now use the main glibc sysdeps directory
4068 instead of some being in a separate "ports" directory (which was
4069 distributed separately before glibc 2.17).
4071 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4072 On configurations that support it (all Linux configurations), it's now
4073 used regardless of the --enable-add-ons switch to configure. It is no
4074 longer possible to build such configurations without pthreads support.
4076 * Locale names, including those obtained from environment variables (LANG
4077 and the LC_* variables), are more tightly checked for proper syntax.
4078 setlocale will now fail (with EINVAL) for locale names that are overly
4079 long, contain slashes without starting with a slash, or contain ".." path
4080 components. (CVE-2014-0475) Previously, some valid locale names were
4081 silently replaced with the "C" locale when running in AT_SECURE mode
4082 (e.g., in a SUID program). This is no longer necessary because of the
4085 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4086 with application code using Intel MPX instructions. (With all previous
4087 versions, the MPX register state could be clobbered when making calls
4088 into or out of a shared library.) Note that while the new dynamic
4089 linker is compatible with all known x86 hardware whether or not it
4090 supports Intel MPX, some x86 instruction-set emulators might fail to
4091 handle the new instruction encodings. This is known to affect Valgrind
4092 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4093 release), and might affect other tools that do instruction emulation.
4095 * Support for loadable gconv transliteration modules has been removed.
4096 The support for transliteration modules has been non-functional for
4097 over a decade, and the removal is prompted by security defects. The
4098 normal gconv conversion modules are still supported. Transliteration
4099 with //TRANSLIT is still possible, and the //IGNORE specifier
4100 continues to be supported. (CVE-2014-5119)
4102 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4103 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4104 resulting a denial-of-service security vulnerability in applications which
4105 use functions related to iconv. (CVE-2014-6040)
4109 * The following bugs are resolved with this release:
4111 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4112 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4113 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4114 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4115 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4116 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4117 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4118 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4119 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4120 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4121 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4122 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4123 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4124 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4125 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4126 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4127 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4128 16431, 16453, 16474, 16506, 16510, 16529
4130 * Slovenian translations for glibc messages have been contributed by the
4131 Translation Project's Slovenian team of translators.
4133 * The public headers no longer use __unused nor __block. This change is to
4134 support compiling programs that are derived from BSD sources and use
4135 __unused internally, and to support compiling with Clang's -fblock
4136 extension which uses __block.
4138 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4139 large collation sequences to optimize multiple passes. This cache
4140 computation may overflow for large collation sequences and may cause a
4141 stack or buffer overflow. This is now fixed to use a slower algorithm
4142 which does not use a cache if there is an integer overflow.
4144 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4145 rules for large collation sequences to optimize multiple passes and falls
4146 back to alloca if malloc fails, resulting in a possible stack overflow.
4147 The implementation now falls back to an uncached collation sequence lookup
4150 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4151 initialized for static applications resulting in the security feature
4152 being disabled. The pointer guard is now correctly initialized to a
4153 random value for static applications. Existing static applications need
4154 to be recompiled to take advantage of the fix (bug 15754).
4156 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4157 to the d_name member of struct dirent, or omit the terminating NUL
4158 character. (Bugzilla #14699).
4160 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4161 aligned_alloc functions could allocate too few bytes or corrupt the
4162 heap when passed very large allocation size values (Bugzilla #15855,
4165 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4166 for AF_INET6 has been fixed (Bugzilla #16072).
4168 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4169 pap_CW, quz_PE, the_NP.
4171 * Substantially revised locales: gd_GB, ht_HT
4173 * The LC_ADDRESS field was updated to support country_car for almost all
4176 * ISO 1427 definitions were updated.
4178 * ISO 3166 definitions were updated.
4180 * The localedef utility now supports --big-endian and --little-endian
4181 command-line options to generate locales for a different system from that
4182 for which the C library was built.
4184 * Binary locale files now only depend on the endianness of the system for
4185 which they are generated and not on other properties of that system. As a
4186 consequence, binary files generated with new localedef may be incompatible
4187 with old versions of the GNU C Library, and binary files generated with
4188 old localedef may be incompatible with this version of the GNU C Library,
4189 in the following circumstances:
4191 + Locale files may be incompatible on m68k systems.
4193 + Locale archive files (but not separate files for individual locales) may
4194 be incompatible on systems where plain "char" is signed.
4196 * The configure option --disable-versioning has been removed. Builds with
4197 --disable-versioning had not worked for several years.
4199 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4200 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4202 * SystemTap probes for malloc have been introduced.
4204 * SystemTap probes for slow multiple precision fallback paths of
4205 transcendental functions have been introduced.
4207 * Support for powerpc64le has been added.
4209 * The soft-float powerpc port now supports e500 processors.
4211 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4213 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4214 set of header declarations that are enabled by default, even when other
4215 feature test macros or compiler options such as -std=c99 would otherwise
4216 disable some of those declarations.
4218 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4219 conflict with POSIX. The libbsd-compat library (which was a dummy library
4220 that did nothing) has also been removed.
4222 * Preliminary documentation about Multi-Thread, Async-Signal and
4223 Async-Cancel Safety has been added.
4225 * Change of ABI data structures for s390 and s390x:
4226 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4227 allow for future hardware extensions. All library functions that accept or
4228 return these structures were versioned in order to provide backwards
4229 compatibility with existing code. However, not all cases can be handled
4230 with interface versioning. If an application embeds either structure into
4231 another structure and that structure is passed to another compilation unit
4232 which expects the newer larger-sized object then any access to the new
4233 fields will result in undefined behaviour. Similarly any access to fields
4234 that were moved by the enlarging of the structures will cause undefined
4235 behaviour. To fix the undefined behaviour all objects that are part of the
4236 final in-memory image must agree on the size of structures, and this may
4237 require recompilation.
4241 * The following bugs are resolved with this release:
4243 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4244 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4245 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4246 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4247 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4248 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4249 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4250 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4251 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4252 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4253 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4254 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4255 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4258 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4259 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4260 Distributions can re-enable building and using pt_chown via the new configure
4261 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4262 considerable security risks and should only be used if the distribution
4263 understands and accepts the risks.
4265 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4268 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4269 fixed (Bugzilla #15330).
4271 * Add support for calling C++11 thread_local object destructors on thread
4272 and program exit. This needs compiler support for offloading C++11
4273 destructor calls to glibc.
4275 * Improved worst case performance of libm functions with double inputs and
4278 * Support for priority inherited mutexes in pthread condition variables on
4279 non-x86 architectures.
4281 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4283 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4285 * Optimized string functions for ARM. Implemented by Will Newton and
4288 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4290 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4293 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4294 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4296 * Added a benchmark framework to track performance of functions in glibc.
4298 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4299 It is based on draft TS 18661 and currently enabled as a GNU extension.
4301 * On Linux, the clock function now uses the clock_gettime system call
4302 for improved precision, rather than old times system call.
4304 * Added support for version-3 tz format files. This is needed when using
4305 the tz database release 2013e or later, and affects a few unusual cases --
4306 currently only TZ='America/Godthab' for time stamps after 2037.
4308 * Added new API functions pthread_getattr_default_np and
4309 pthread_setattr_default_np to get and set the default pthread
4310 attributes of a process.
4312 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4313 This may improve lock scaling of existing programs on TSX capable systems.
4314 When the --enable-lock-elision=yes parameter is specified at configure
4315 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4318 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4319 availability). Implemented by Ryan S. Arnold.
4321 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4325 * The following bugs are resolved with this release:
4327 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4328 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4329 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4330 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4331 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4332 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4333 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4334 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4335 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4336 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4337 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4338 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4339 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4340 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4341 14879, 14889, 14893, 14898, 14914.
4343 * Optimization of memcpy for MIPS.
4345 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4346 EMFILE has been fixed (Bugzilla #14889).
4348 * The add-on ports collection is now distributed in the "ports" subdirectory
4349 of the main GNU C Library distribution, rather than separately.
4351 * Port to ARM AArch64 contributed by Linaro.
4353 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4354 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4356 Implemented by Andreas Krebbel.
4358 * The new function secure_getenv allows secure access to the environment,
4359 returning NULL if running in a SUID/SGID process. This function replaces
4360 the internal function __secure_getenv.
4362 * SystemTap static probes have been added into the dynamic linker.
4363 Implemented by Gary Benson.
4365 * Optimizations of string functions strstr, strcasestr and memmem.
4366 Implemented by Maxim Kuvyrkov.
4368 * The minimum Linux kernel version that this version of the GNU C Library
4369 can be used with is 2.6.16.
4371 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4372 powerpc POWER7. Implemented by Will Schmidt.
4374 * New configure option --disable-nscd builds the C library such that it
4375 never attempts to contact the Name Service Caching Daemon (nscd).
4376 New configure option --disable-build-nscd avoids building nscd itself;
4377 this is the default if --disable-nscd is used.
4379 * Improved support for cross-compilation, including cross-testing and
4380 bootstrap builds without a previously built glibc.
4382 * Several testsuite tests are now able to test multiple IFUNC variants of an
4383 interface, rather than just testing the one that would be chooen by
4386 * New configure options --with-bugurl and --with-pkgversion, for
4387 distributors to use to embed their bug-reporting and package version
4388 information in --help and --version output.
4390 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4391 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4392 allows creation of chroots without the procfs mounted on /proc.
4394 * The `crypt' function now fails if passed salt bytes that violate the
4395 specification for those values. On Linux, the `crypt' function will
4396 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4397 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4398 when the mode is enabled.
4400 * The `clock_*' suite of functions (declared in <time.h>) is now available
4401 directly in the main C library. Previously it was necessary to link with
4402 -lrt to use these functions. This change has the effect that a
4403 single-threaded program that uses a function such as `clock_gettime' (and
4404 is not linked with -lrt) will no longer implicitly load the pthreads
4405 library at runtime and so will not suffer the overheads associated with
4406 multi-thread support in other code such as the C++ runtime library.
4408 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4413 * The following bugs are resolved with this release:
4415 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4416 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4417 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4418 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4419 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4420 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4421 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4422 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4423 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4424 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4425 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4426 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4427 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4428 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4429 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4430 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4431 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4432 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4433 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4434 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4435 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4436 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4439 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4440 configuring glibc with:
4441 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4442 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4443 Implemented by H.J. Lu.
4447 + define static_assert
4449 + do not declare gets
4451 + declare at_quick_exit and quick_exit also for ISO C11
4453 + aligned_alloc. NB: The code is deliberately allows the size parameter
4454 to not be a multiple of the alignment. This is a moronic requirement
4455 in the standard but it is only a requirement on the caller, not the
4458 + timespec_get added
4460 + uchar.h support added
4462 + CMPLX, CMPLXF, CMPLXL added
4464 Implemented by Ulrich Drepper.
4466 * Support for the IA-64 has been moved to ports.
4468 * Remove support for anything but ELF binary format
4470 * Checking versions of poll, ppoll added.
4471 Implemented by Ulrich Drepper.
4473 * More generic and 64-bit performance optimizations to math functions.
4474 Implemented by Ulrich Drepper.
4476 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4477 headers and functions available at compile time as they were before
4478 version 2.14. This option will be removed at some time in the future
4479 after the TI-RPC library becomes fully sufficient for the needs of
4480 existing applications.
4482 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4483 Note that glibc is not expected to work with any Linux kernel version
4486 * New header <sys/auxv.h> and function getauxval allowing easy access to
4487 the AT_* key-value pairs passed from the Linux kernel. The header also
4488 defines the HWCAP_* bits associated with the AT_HWCAP key.
4490 * New locales: mag_IN
4492 * New configure option --enable-systemtap builds SystemTap static probes
4493 into libc for setjmp and longjmp and into libpthread for various operations.
4494 So far the setjmp/longjmp probes and some of the libpthread probes are
4495 provided only for i*86 and x86_64.
4496 Implemented by Roland McGrath and Rayson Ho.
4498 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4500 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4503 * More optimized functions for SPARC. Implemented by David S. Miller.
4505 * Improved support for cross-compilation, especially bootstrap builds
4506 without a previously built glibc.
4508 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4509 Chris Metcalf from Tilera.
4511 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4512 now supported for ARM processors.
4514 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4515 as the name of the dynamic linker, to distinguish it from the
4516 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4518 * Support for CRIS has been removed from ports.
4520 * A new class of installed header has been documented for low-level
4521 platform-specific functionality. PowerPC added the first instance with a
4522 function to provide time base register access. Contributed by Tulio
4523 Magno Quites Machado Filho.
4525 * ix86 configurations now install header files that are consistent with
4526 what x86-64 configurations install. These same header files can be used
4527 for -m32, -m64, or -mx32 builds.
4528 Contributed by H.J. Lu.
4530 * Math library bug fixes. A thorough audit of all open math library bugs was
4531 conducted by Joseph Myers. Significant progress was made on many math
4532 library bugs resulting in more accurate exceptions and function results.
4533 Many thanks to all those that contributed including Andreas Jaeger for his
4534 patch review and work on the x87 trigonometric instruction issues.
4536 * Timezone data is no longer installed. Timezone-related binaries and scripts
4537 will continue to be installed. Users should obtain their timezone data from
4538 their distribution provider or from the tzdata package at
4539 <ftp://munnari.oz.au/pub/>.
4543 * The following bugs are resolved with this release:
4545 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4546 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4547 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4548 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4549 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4550 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4551 13484, 13506, 13515, 13523, 13524, 13538, 13540
4553 * New program pldd to list loaded object of a process
4554 Implemented by Ulrich Drepper.
4556 * Add nss_db support back to glibc. No more dependency on Berkeley db
4557 and support for initgroups lookups.
4558 Implemented by Ulrich Drepper.
4560 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4561 Contributed by HJ Lu.
4563 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4564 Contributed by HJ Lu.
4566 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4567 on x86-32 and x86-64.
4568 Contributed by Liubov Dmitrieva.
4570 * Optimized strchr and strrchr for SSE on x86-32.
4571 Contributed by Liubov Dmitrieva.
4573 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4574 for x86-64 and x86-32.
4575 Contributed by Liubov Dmitrieva.
4577 * New interfaces: scandirat, scandirat64
4578 Implemented by Ulrich Drepper.
4580 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4581 Implemented by Ulrich Drepper.
4583 * nscd now also caches the netgroup database.
4584 Implemented by Ulrich Drepper.
4586 * Integrate libm with gcc's -ffinite-math-only option.
4587 Implemented by Ulrich Drepper.
4589 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4590 to math functions. Implemented by Ulrich Drepper.
4592 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4593 Implemented by Ulrich Drepper.
4595 * New Linux interfaces: process_vm_readv, process_vm_writev
4597 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4598 Implemented by Ulrich Drepper.
4600 * Optimized nearbyint and strcasecmp for PPC.
4601 Implemented by Adhemerval Zanella.
4603 * New locales: bho_IN, unm_US, es_CU, ta_LK
4607 * The following bugs are resolved with this release:
4609 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4610 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4611 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4612 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4613 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4614 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4615 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4616 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4617 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4618 12795, 12811, 12813, 12814, 12841
4620 * The RPC implementation in libc is obsoleted. Old programs keep working
4621 but new programs cannot be linked with the routines in libc anymore.
4622 Programs in need of RPC functionality must be linked against TI-RPC.
4623 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4625 Visible changes of this change include (obviously) the inability to link
4626 programs using RPC functions without referencing the TI-RPC library and the
4627 removal of the RPC headers from the glibc headers.
4628 Implemented by Ulrich Drepper.
4630 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4631 syncfs, setns, sendmmsg
4633 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4634 yue_HK, lij_IT, mhr_RU
4636 * New encodings: CP770, CP771, CP772, CP773, CP774
4638 * New program sotruss to trace calls through PLTs
4639 Implemented by Ulrich Drepper.
4641 * The malloc hook implementation is marked deprecated and will be removed
4642 from the default implementation in the next version. The design never
4643 worked ever since the introduction of threads. Even programs which do
4644 not create threads themselves can use multiple threads created internally.
4648 * The following bugs are resolved with this release:
4650 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4651 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4652 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4653 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4656 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4658 * POWER7 optimizations: memset, memcmp, strncmp
4660 * New optimized string functions for x86-64: strnlen (SSE2),
4661 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4662 Implemented by Ulrich Drepper.
4666 * The following bugs are resolved with this release:
4668 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4669 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4670 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4671 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4672 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4673 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4674 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4675 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4677 * New interfaces: pthread_getname_np, pthread_setname_np
4679 * New Linux interface: recvmmsg
4681 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4683 * The dynamic linker now recognizes supported ABI versions from the
4684 EI_ABIVERSION field in the ELF header.
4685 Implemented by Ulrich Drepper.
4687 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4688 will not be used to fill in password fields in the passwd.byname replies.
4689 Instead it is used to synthesize the shadow.byname table, should it be
4690 missing. This is a useful mode in some installations involving Solaris.
4691 Implemented by Ulrich Drepper.
4693 * New locales: kok_IN, sq_MK, cv_RU
4697 * The following bugs are resolved with this release:
4699 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4700 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4701 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4702 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4703 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4704 10789, 10817, 10823, 10840, 10847
4706 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4708 Implemented by Ulrich Drepper.
4710 * Checking version of longjmp added that fails if an uninitialized stack
4711 frame would be created. Implemented by Ulrich Drepper.
4713 * STT_GNU_IFUNC is now supported in static executables.
4714 Implemented by H.J. Lu.
4716 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4718 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4719 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4720 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4721 Contributed by H.J. Lu.
4723 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4724 Implemented by Ulrich Drepper.
4726 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4728 Contributed by H.J. Lu.
4730 * Support for fma instruction in AVX on x86-64.
4731 Implemented by H.J. Lu and Ulrich Drepper.
4733 * AVX support in x86-64 auditing support in ld.so.
4734 Implemented by H.J. Lu.
4736 * STB_GNU_UNIQUE support added.
4737 Implemented by Ulrich Drepper.
4739 * Implement second fallback mode for optimized DNS lookup for even more
4740 broken environments. If two requests from the same port are not
4741 handled correctly close the socket and open a new one before sending
4742 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4743 can be used to select this mode right away, instead of rediscovering the
4744 necessity is every process again.
4745 Implemented by Ulrich Drepper.
4747 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4748 Implemented by Adam Tkac.
4750 * Optimized iconv conversions for S390x.
4751 Implemented by Andreas Krebbel.
4753 * Using condvars with PI mutexes is now more efficient due to kernel
4754 support for requeueing to PI futexes. NPTL support added for x86-64.
4755 Implemented by Ulrich Drepper.
4757 * New locales: ps_AF, my_MM
4761 * The following bugs are resolved with this release:
4763 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4764 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4765 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4766 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4767 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4769 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4770 Implemented by Ulrich Drepper.
4772 * New Linux interfaces: accept4, fallocate, fallocate64.
4773 Implemented by Ulrich Drepper.
4775 * Correct declarations of string function when used in C++ code. This
4776 could lead to compile errors for invalid C++ code.
4778 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4781 * New POSIX 2008 interface: psiginfo
4782 Implemented by Ulrich Drepper.
4784 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4785 Implemented by Ulrich Drepper.
4787 * Support for selecting between multiple function definitions at runtime
4788 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4790 * The libcrypt library can now use the hash function implementations in
4791 NSS. Implemented by Ulrich Drepper.
4793 * The malloc implementation can be compiled to be less memory efficient
4794 but higher performing in multi-threaded programs.
4795 Implemented by Ulrich Drepper.
4797 * New locales: nan_TW@latin, ks_IN
4799 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4800 Implemented by Ulrich Drepper.
4802 * Extended printf hook support. It is possible to use user-defined types
4803 and extend existing format specifiers.
4804 Implemented by Ulrich Drepper.
4806 * Handling for group shadow files has been added.
4807 Implemented by Ulrich Drepper.
4809 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4810 servers (the case, e.g., for some people using the built-in DNS
4811 server in ADSL modems/routers). There is a once-per-process timeout
4812 in case of a broken server. To avoid it, users can run nscd or put
4813 'options single-request' in /etc/resolv.conf.
4814 Implemented by Ulrich Drepper.
4818 * The following bugs are resolved with this release:
4820 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
4821 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
4822 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
4823 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
4824 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
4826 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4827 up at the same time. Implemented by Ulrich Drepper.
4829 * TLS descriptors for LD and GD on x86 and x86-64.
4830 Implemented by Alexandre Oliva.
4832 * getaddrinfo now handles DCCP and UDPlite.
4833 Implemented by Ulrich Drepper.
4835 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4836 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4837 Implemented by Ulrich Drepper.
4839 * New implementation of memmem, strstr, and strcasestr which is O(n).
4840 Implemented by Eric Blake.
4842 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4844 * Implement "e" option for popen to open file descriptor with the
4845 close-on-exec flag set. Implemented by Ulrich Drepper.
4847 * Implement "b" mode for fmemopen. In this mode writes writes don't
4848 implicitly add a NUL byte and seeks from the end of the buffer really
4849 use the buffer end, not the string length as the basis.
4850 Implemented by Ulrich Drepper.
4852 * Many functions, exported and internal, now atomically set the close-on-exec
4853 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4855 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4857 Implemented by Pravin Satpute.
4859 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4863 * The following bugs are resolved with this release:
4865 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4866 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4867 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4868 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4869 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4870 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4871 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4873 * New locales: bo_CN, bo_IN, shs_CA.
4875 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4877 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4878 Implemented by Pravin Satpute.
4880 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4882 * nscd caches now all timeouts for DNS entries
4883 Implemented by Ulrich Drepper.
4885 * nscd is more efficient and wakes up less often.
4886 Implemented by Ulrich Drepper.
4888 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4889 vdprintf, and obstack_vprintf.
4890 Implemented by Jakub Jelinek.
4892 * Faster memset for x86-64.
4893 Implemented by Harsha Jagasia and H.J. Lu.
4895 * Faster memcpy on x86.
4896 Implemented by Ulrich Drepper.
4898 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4899 Implemented by Ulrich Drepper.
4901 * Faster sqrt and sqrtf implemention for some PPC variants.
4902 Implemented by Steven Munroe.
4906 * The following bugs are resolved with this release:
4908 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4909 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4910 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4911 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4912 5071, 5103, 5104, 5112, 5113, 5184, 5186
4914 * More checking functions: fread, fread_unlocked, open*, mq_open.
4915 Implemented by Jakub Jelinek and Ulrich Drepper.
4917 * Extend fortification to C++. Implemented by Jakub Jelinek.
4919 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4920 by not recognizing 'a' as a modifier when those specs are requested.
4921 Implemented by Jakub Jelinek.
4923 * PPC optimizations to math and string functions.
4924 Implemented by Steven Munroe.
4926 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4927 options to be passed. Implemented by Ulrich Drepper.
4929 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4931 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4932 Implemented by Ulrich Drepper.
4934 * Handle private futexes in the NPTL implementation.
4935 Implemented by Jakub Jelinek and Ulrich Drepper.
4937 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4938 Implemented by Roland McGrath and Ulrich Drepper.
4940 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4942 * SHA-256 and SHA-512 based password encryption.
4943 Implemented by Ulrich Drepper.
4945 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4946 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4949 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4950 Implemented by Ulrich Drepper.
4954 * The following bugs are resolved with this release:
4956 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4957 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4958 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4959 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4960 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4961 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4962 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4965 * New Linux interfaces: epoll_pwait, sched_getcpu.
4967 * New generic interfaces: strerror_l.
4969 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4973 * The following bugs are resolved with this release:
4975 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4976 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4977 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4978 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4979 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4980 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4981 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4982 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4983 3225, 3251, 3252, 3253, 3273
4985 * For Linux, the sorting of addresses returned by getaddrinfo now also
4986 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4987 Implemented by Ulrich Drepper.
4989 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4990 Implemented by Ulrich Drepper.
4992 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4994 * New iconv module for MIK. Contributed by Alexander Shopov.
4996 * For sites with broken group and/or passwd database, the auto-propagate
4997 option of nscd can prevent creating ID lookup entries from the results
4998 of a name lookup and vice versa. This usually is no problem but some
4999 site might have problems with the default behavior.
5000 Implemented by Ulrich Drepper.
5002 * Iterating over entire database in NIS can be slow. With the
5003 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5004 to trade time for memory. The entire database will be read at once.
5005 Implemented by Ulrich Drepper.
5007 * The interfaces introduced in RFC 3542 have been implemented by
5010 * Support for the new ELF hash table format was added by Ulrich Drepper.
5012 * Support for priority inheritance mutexes added by Jakub Jelinek and
5015 * Support for priority protected mutexes added by Jakub Jelinek.
5017 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5018 or_IN, csb_PL, fy_NL, sr_ME.
5022 * More overflow detection functions.
5024 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5025 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5027 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5028 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5029 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5030 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5031 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5032 by Masahide Washizawa.
5034 * It is now possible to install audit libraries for the dynamic linker using
5035 LD_AUDIT. Implemented by Ulrich Drepper.
5037 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5038 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5039 For a libc and libpthread that works well on Linux 2.4 kernels, we
5040 recommend using the stable 2.3 branch.
5042 * The new function open_wmemstream acts like open_memstream,
5043 but uses a wchar_t wide character buffer.
5045 * The new function ppoll is an improved version of poll, similar to pselect.
5047 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5048 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5049 renameat, unlinkat, linkat, symlinkat, readlinkat.
5051 * New Linux kernel system calls: unshare,
5052 inotify_init, inotify_add_watch, inotify_rm_watch.
5054 * The euidaccess function is now also known by the alias eaccess,
5055 for compatibility with some other systems.
5057 * Timezone data updated to 2006b version.
5061 * The following bugs are resolved with this release:
5063 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5064 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5065 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5066 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5067 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5068 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5070 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5072 * As of this release, GCC 4 can be used to compile the C Library.
5074 * Timezone data updated to 2005m version.
5078 * The following bugs are resolved with this release:
5080 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5081 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5082 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5083 777, 787, 821, 822, 823, 825
5085 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5089 * Support for RFC 3678. Real implementations exist only for Linux so far.
5090 Implemented by Ulrich Drepper.
5092 * nscd can now cache entries persistently. Expiring entries are reloaded.
5093 For speedups the cache can be shared in memory with client processes.
5094 Implemented by Ulrich Drepper.
5096 * nscd can now perform SELinux checks.
5097 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5099 * getaddrinfo queries are now cached. Canonical name lookup is performed
5101 Implemented by Ulrich Drepper.
5103 * The nothrow function attribute is used when headers are used by gcc when
5104 compiling C code. This can avoid significant amounts of exception
5107 * The malloc functions perform more error checking and are stricter when
5108 it comes to reacting on errors. The default action is to terminate
5109 the process after showing an error message. Implemented by Ulrich Drepper.
5111 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5112 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5114 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5115 namespaces using the new function dlmopen(). This feature is of course,
5116 like most other dynamic loading functionality, not available in statically
5117 linked applications. Implemented by Ulrich Drepper.
5119 * Low-overhead boundary checking variants of string and some stdio functions
5120 were added. These are to be used in conjunction with a gcc patch by
5121 Jakub Jelinek which adds calls to these functions if possible.
5122 Implemented by Jakub Jelinek and Ulrich Drepper.
5124 * Old code for several operating systems and machine architectures that
5125 have not been in working condition in a long time have been removed from
5126 the main source tree maintained by the GNU C Library's maintainers.
5127 These files are now reside in the separate `ports' source module
5128 that is usable as an add-on when building the library.
5132 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5133 interrogate the dynamic linker, compatible with the Solaris interface.
5135 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5136 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5138 * getifaddrs now uses the netlink interface on Linux to get its information.
5139 Implemented by Thorsten Kukuk.
5141 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5142 Implemented by Ulrich Drepper.
5144 * support for non-executable stacks on x86 has been added. Changes mostly
5147 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5150 * getaddrinfo now performs destination address selection according to
5155 * Thread-safe interfaces for many functions that access locale data
5156 were added in version 2.3, but these features were omitted from NEWS.
5157 Many functions have variants with an `_l' suffix that take a `locale_t'
5158 object as a parameter rather than consulting the current locale.
5159 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5160 create and maintain `locale_t' objects. Additionally, the new function
5161 `uselocale' sets "the current locale" (as used by functions not so
5162 parameterized) set for an individual thread. These features were added
5163 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5165 * The functions getresuid, getresgid, setresuid, and setresgid, which
5166 have long been available on Linux, are now declared in <unistd.h>
5167 and are now also available on the Hurd.
5169 * ELF thread-local storage support (TLS) now works on x86-64.
5171 * The new dynamic string token $LIB is expanded in shared library names.
5172 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5174 * Aldy Hernandez contributed complete software floating point support for
5175 PowerPC machines with no FPU.
5177 * fexecve is implemented on Linux.
5179 * The `btowc' function should work at least twice as fast due to
5180 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5182 * With approriate thread add-ons cancelable functions are now implemented
5183 in libc.so as well. No need to call the function in libpthread. This
5184 change allowed to finally disable the incorrect and expensive handling
5185 of weak definition in ld.so.
5187 * Yet more PLT entries in libc.so have been removed. We finally arrived
5188 at the bare minimum. Startup times improved appropriately.
5190 * Support for the new Linux/x86 system call interface was added. The
5191 AT_SYSINFO auxiliary vector entry is recognized and handled.
5195 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5198 * iconv (the program and the interface) now accepts empty names (excluding
5199 options like //TRANSLIT) to mean "use charset of current locale".
5201 * localedef can now transliterate characters in strings which are not in
5202 the provided charmap. The information from the input locale is used.
5204 * Prelinking support was added for ELF targets. This requires additional
5205 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5207 * Read-only stdio streams now use mmap to speed up operation by eliminating
5208 copying and buffer underflows. To use add 'm' to the mode string of
5209 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5211 * The malloc functions were completely rewritten by Wolfram Gloger based
5212 on Doug Lea's malloc-2.7.0.c.
5214 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5215 implementation of regex.
5217 * Bruno Haible upgraded the iconv and locale implementation to support
5220 * Contents of the LC_* and LANG environment variables in the CEN style are
5221 not recognized anymore. It never was used. Change by Ulrich Drepper.
5223 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5224 thread-local storage (TLS) ABI on some platforms.
5225 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5227 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5228 EUC-JISX0213, and TSCII.
5230 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5231 BSD-compatible interface for getting all network interface addresses.
5232 Implementation for IPv4 by Roland McGrath.
5234 * Loading of locale data is faster due to the introduction of a locale
5235 archive. Implemented by Roland McGrath and Ulrich Drepper.
5237 * Startup times are significantly reduced by not using exported functions
5238 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5241 * Steven Munroe contributed a port to PowerPC64/Linux.
5245 * The Hurd now uses the GNU libio implementation of stdio rather than the
5246 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5248 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5249 with the same behavior as the Linux system call of the same name.
5253 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5254 128-bit long double format.
5256 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5257 IBM1161, and IBM1162 charsets.
5259 * Andreas Jaeger contributed a port to x86-64/Linux.
5261 * Peter Bruin contributed a port to PowerPC/Hurd.
5263 * libc functions using I/O streams now can handle wide-oriented streams
5266 * optimizations in the dynamic linker. Binaries created by recent binutils
5267 versions start up quicker due to reduced time spent on relocations.
5269 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5273 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5274 asinh, atanh, j0 for the 128-bit long double format.
5276 * Bruno Haible updated all the code handling Unicode in some form to
5277 support Unicode 3.1.
5279 * Speed of regex for single-byte locales is back to previous levels.
5280 Patch by Isamu Hasegawa.
5282 * Alpha, SPARC, and IA-64 now also using floating stacks.
5284 * Startup time of internationalized applications greatly improved through
5285 iconv cache. Use iconvconfig to generate the cache file.
5286 Contributed by Ulrich Drepper.
5288 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5289 severe performance problems. Patch by David Mosberger.
5291 * The Hurd port got a lot more functionality like AIO, various stdio
5292 extensions, etc. Mainly done by Roland McGrath.
5294 * mtrace can now lookup symbols in shared libraries.
5298 * Intel's IA-64 math library is largely integrated. It provides fast and
5299 accurate implementatations for most basic and standard math functions
5300 in float, double, and long double format.
5302 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5303 and asin for the 96-bit long double format and asin, log, tan for the
5304 128-bit long double format.
5306 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5307 The basic double functions exist today. Contributed by Abraham Ziv
5308 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5309 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5311 * An asynchronous name lookup library was added. The interface is designed
5312 after POSIX AIO. The proposal was circulated beforehand to get comments.
5313 No negative ones came in. Implemented by Ulrich Drepper.
5315 * Port to S390/64bit contributed by Martin Schwidefsky
5316 <schwidefsky@de.ibm.com>.
5318 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5319 of functions for Linux/IA-64.
5321 * The RPC code is now thread safe. Threads can now use the same service
5322 of different services at the same time. Patch by Eric Norum
5323 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5325 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5326 family of functions for Linux/S390.
5328 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5329 of functions for Linux/x86.
5331 * Port to Linux/CRIS contributed by Axis Communications.
5335 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5336 we can now check for namespace violations and missing declarations. The
5337 result is that almost all headers are now Unix-compliant (as defined in
5338 the upcoming XPG6). The negative side is that some programs might need
5339 corrections, too, if they depend on the incorrect form of the headers in
5340 previous versions which defined too many symbols and included too many
5343 * regex now handles multibyte character sets correctly.
5344 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5346 * iconv (the program) does now conform to the upcoming XPG6 and handles
5347 charmaps. Instead of the charset names the path of charmaps can be
5348 provided and the conversion happens based on this data.
5349 Contributed by Ulrich Drepper.
5351 * The locale program now provides detailed information about the installed
5356 only lists the names of the supported locales
5360 provides details such as country, language, and codeset name.
5361 Contributed by Ulrich Drepper.
5365 * The gencat program now parses the input file according to the charset
5366 selected by the LC_CTYPE category. This is important for stateful
5367 character sets. To make generating catalogs easier there is a way
5368 to overwrite the charset selected by the locale: before the first
5369 message or $ quote line the catalog can contain a line like
5371 $ codeset=ISO-8859-2
5373 to select the charset (ISO-8859-2 in this case).
5375 Implemented by Shinya Hanataka and Ulrich Drepper.
5377 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5378 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5379 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5381 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5382 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5384 * The LANGUAGE environment variable is now ignored unless the locale is
5385 changed from the default "C" locale.
5387 * The usual bug fixes.
5391 * Greg McGary added runtime support for bounds checking using gcc's
5392 new -fbounded-pointers option. ix86 target is complete. PowerPC
5395 * Thorsten Kukuk added secure mode support to nscd.
5397 * The Berkeley db libraries have been removed.
5399 Related, the nss_db module is now in a separate package since it
5400 obviously requires a database library being available.
5402 * Wide character I/O streams implemented by Ulrich Drepper.
5404 * Functions from the extended socket API added by Ulrich Drepper.
5406 * Functions feenableexcept and fedisableexcept to control the
5407 behaviour of individual exceptions have been added by Andreas Jaeger.
5409 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5411 * The resolver code has been updated from bind 8.2.3-T5B which supports
5412 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5415 This change could in some situations effect backward compatibility. Since
5416 now `_res' is a thread-local instead of a global variable, modifying it
5417 in one thread does not have any effect in other threads.
5419 The resolver library was also extended to allow IPv6 as the transport
5420 protocol for the requests. This work was done by Stig Venaas.
5422 * Compatibility code for K&R C compilers has been removed from the
5423 header files. A ISO C compiler is needed to use the library
5424 (conforming to either C89 or C99 standard).
5426 * Complete rewrite of the localedef program to support multibyte character
5427 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5428 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5429 Implemented by Ulrich Drepper.
5431 Bruno Haible significantly improved the generation and use of the data
5432 structures for the wide character tables.
5434 * Plural handling in gettext implemented by Ulrich Drepper.
5436 * The utmp daemon has been removed.
5438 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5440 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5443 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5445 * POSIX barriers implemented by Kaz Kylheku.
5447 * POSIX spawn function family implemented by Ulrich Drepper.
5449 * POSIX spinlocks are now available.
5451 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5453 * the configure option --enable-kernel=X.Y.Z allows to strip out
5454 compatibility for kernel versions before X.Y.Z. This is currently only
5455 implemented for Linux.
5457 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5458 field sin6_scope_id. This means that all programs using IPv6 should be
5459 recompiled. Don't expect binary compatibility with previous glibc
5462 * various conversion modules for IBM character sets contributed by
5465 * IA-64 port by Jes Sorensen and HJ Lu.
5479 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5481 * New xdr functions are added; some rpc functions are now 64bit clean.
5483 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5485 * Fixed known incompatibilities with glibc 2.0.
5487 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5489 * Optimized a number of functions (especially the ELF dynamic loader).
5491 * Update timezone data files.
5493 * lots of charmaps corrections
5495 * some new locale definitions and charmaps
5500 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5501 conform to POSIX member type requirements. Symbol versions have been
5502 adjusted as needed within the library, and for direct use by applications,
5503 but there is potential for problems if third-party libraries use
5504 struct timeval as part of their interface. This does not present
5505 a problem for X and other "essential" system libraries.
5507 * An additional locale model to support C++ Standard Library locale
5508 model and probably more was implemented by Ulrich Drepper.
5510 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5513 * Miles Bader provided the `argp' function family to support hierachical
5514 command line argument parsing, layered on top of getopt.
5516 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5518 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5521 * scanf recognizes the %a and %A format for scanning floating point numbers.
5523 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5524 information and interfaces for the available integer types.
5526 * about 130 new math functions were added to implement the ISO C9x math
5529 * the new header <complex.h> contains definitions of the complex math
5530 functions from ISO C 9X.
5532 * the new header <tgmath.h> defines generic macros to use complex or
5533 real valued functions.
5535 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5537 * Andreas Jaeger provided a test suite for the math library.
5539 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5541 * Ulrich Drepper added character set conversion functions (iconv).
5543 * Optimized string functions have been added.
5545 * The localedata addon is now part of glibc.
5547 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5549 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5550 daemon for NSS (nscd).
5552 Missing a better place here are some numbers on improvements. Under
5553 Linux 2.1.125 un-tar-ing the kernel sources takes
5557 using local files 12.19s 6.88s 22.91s
5559 using NIS 13.92s 8.91s 26.34s
5561 using NIS & nscd 10.37s 7.34s 25.30s
5563 using NIS+ 27.57s 30.37s 640.46s
5565 using NIS+ & nscd 10.25s 7.83s 26.51s
5567 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5569 Keep in mind that non-namelookup related operations dominate above times.
5570 It was just a common complain that using NIS+ unpacking the kernel is
5573 [1] The old nscd implementation is not available anymore since it was
5574 distributed with glibc up to version 2.0.98 and thus is now replaced.
5576 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5578 * Mark Kettenis provided a Hesiod NSS module.
5580 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5581 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5583 * rcmd can now handle netgroups (Dick Streefland).
5585 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5588 * Support for the IPv6 protocol has been added to the socket API, as per the
5589 latest draft standards.
5591 * Support for Linux 2.2 has been added.
5593 * Interface changes relative to the latest 2.0.x release:
5594 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5595 addseverity NEW: Unix98
5596 alphasort64 NEW: LFS
5597 argp_err_exit_status NEW: argp, GNU ext
5598 argp_error NEW: argp, GNU ext
5599 argp_failure NEW: argp, GNU ext
5600 argp_help NEW: argp, GNU ext
5601 argp_parse NEW: argp, GNU ext
5602 argp_program_bug_address NEW: argp, GNU ext
5603 argp_program_version NEW: argp, GNU ext
5604 argp_program_version_hook NEW: argp, GNU ext
5605 argp_state_help NEW: argp, GNU ext
5606 argp_usage NEW: argp, GNU ext
5607 authdes_create NEW: Secure RPC
5608 authdes_getucred NEW: Secure RPC
5609 authdes_pk_create NEW: Secure RPC
5610 backtrace NEW: GNU ext.
5611 backtrace_symbols NEW: GNU ext.
5612 backtrace_symbols_fd NEW: GNU ext.
5614 cacosf NEW: ISO C 9x
5615 cacosh NEW: ISO C 9x
5616 cacoshf NEW: ISO C 9x
5617 cacoshl NEW: ISO C 9x
5618 cacosl NEW: ISO C 9x
5625 casinf NEW: ISO C 9x
5626 casinh NEW: ISO C 9x
5627 casinhf NEW: ISO C 9x
5628 casinhl NEW: ISO C 9x
5629 casinl NEW: ISO C 9x
5631 catanf NEW: ISO C 9x
5632 catanh NEW: ISO C 9x
5633 catanhf NEW: ISO C 9x
5634 catanhl NEW: ISO C 9x
5635 catanl NEW: ISO C 9x
5636 cbc_crypt NEW: Secure RPC
5640 ccoshf NEW: ISO C 9x
5641 ccoshl NEW: ISO C 9x
5647 cimagf NEW: ISO C 9x
5648 cimagl NEW: ISO C 9x
5649 clearerr_locked REMOVED
5650 clntunix_create NEW: sunrpc ext
5652 clog10 NEW: ISO C 9x
5653 clog10f NEW: ISO C 9x
5654 clog10l NEW: ISO C 9x
5664 cprojf NEW: ISO C 9x
5665 cprojl NEW: ISO C 9x
5667 crealf NEW: ISO C 9x
5668 creall NEW: ISO C 9x
5673 csinhf NEW: ISO C 9x
5674 csinhl NEW: ISO C 9x
5677 csqrtf NEW: ISO C 9x
5678 csqrtl NEW: ISO C 9x
5682 ctanhf NEW: ISO C 9x
5683 ctanhl NEW: ISO C 9x
5685 des_setparity NEW: Secure RPC
5686 ecb_crypt NEW: Secure RPC
5687 endutxent NEW: Unix98
5689 exp10f NEW: ISO C 9x
5690 exp10l NEW: ISO C 9x
5694 fattach NEW: STREAMS
5695 fdetach NEW: STREAMS
5699 feclearexcept NEW: ISO C 9x
5700 fegetenv NEW: ISO C 9x
5701 fegetexceptflag NEW: ISO C 9x
5702 fegetround NEW: ISO C 9x
5703 feholdexcept NEW: ISO C 9x
5705 feraiseexcept NEW: ISO C 9x
5706 ferror_locked REMOVED
5707 fesetenv NEW: ISO C 9x
5708 fesetexceptflag NEW: ISO C 9x
5709 fesetround NEW: ISO C 9x
5710 fetestexcept NEW: ISO C 9x
5711 feupdateenv NEW: ISO C 9x
5712 fflush_locked REMOVED
5716 fgets_unlocked NEW: GNU ext.
5717 fileno_locked REMOVED
5729 fputc_locked REMOVED
5730 fputs_unlocked NEW: GNU ext.
5731 fread_unlocked NEW: GNU ext.
5736 fstatvfs NEW: Unix98
5740 ftruncate64 NEW: LFS
5742 fwrite_unlocked NEW: GNU ext.
5743 gai_strerror NEW: IPv6
5747 getchar_locked REMOVED
5749 getdate_err NEW: Unix98
5750 getdate_r NEW: GNU ext.
5752 getnameinfo NEW: IPv6
5753 getnetname NEW: Secure RPC
5754 getpmsg NEW: STREAMS
5755 getpt NEW: Unix98 PTY
5756 getrlimit64 NEW: LFS
5757 getutxent NEW: Unix98
5758 getutxid NEW: Unix98
5759 getutxline NEW: Unix98
5760 glob64 NEW: GNU ext.
5761 globfree64 NEW: GNU ext.
5762 gnu_get_libc_release NEW: GNU ext.
5763 gnu_get_libc_version NEW: GNU ext.
5764 grantpt NEW: Unix98 PTY
5765 host2netname NEW: Secure RPC
5767 iconv_close NEW: iconv
5768 iconv_open NEW: iconv
5769 if_freenameindex NEW: IPv6
5770 if_indextoname NEW: IPv6
5771 if_nameindex NEW: IPv6
5772 if_nametoindex NEW: IPv6
5773 in6addr_any NEW: IPv6
5774 in6addr_loopback NEW: IPv6
5775 inet6_isipv4mapped NEW: IPv6
5776 isastream NEW: STREAMS
5777 iswblank NEW: GNU ext.
5778 key_decryptsession NEW: Secure RPC
5779 key_decryptsession_pk NEW: Secure RPC
5780 key_encryptsession NEW: Secure RPC
5781 key_encryptsession_pk NEW: Secure RPC
5782 key_gendes NEW: Secure RPC
5783 key_get_conv NEW: Secure RPC
5784 key_secretkey_is_set NEW: Secure RPC
5785 key_setnet NEW: Secure RPC
5786 key_setsecret NEW: Secure RPC
5787 llrint NEW: ISO C 9x
5788 llrintf NEW: ISO C 9x
5789 llrintl NEW: ISO C 9x
5790 llround NEW: ISO C 9x
5791 llroundf NEW: ISO C 9x
5792 llroundl NEW: ISO C 9x
5797 lrintf NEW: ISO C 9x
5798 lrintl NEW: ISO C 9x
5799 lround NEW: ISO C 9x
5800 lroundf NEW: ISO C 9x
5801 lroundl NEW: ISO C 9x
5803 makecontext NEW: Unix98
5804 mempcpy NEW: GNU ext.
5807 modify_ldt NEW: kernel
5811 nearbyint NEW: ISO C 9x
5812 nearbyintf NEW: ISO C 9x
5813 nearbyintl NEW: ISO C 9x
5814 netname2host NEW: Secure RPC
5815 netname2user NEW: Secure RPC
5816 nexttoward NEW: ISO C 9x
5817 nexttowardf NEW: ISO C 9x
5818 nexttowardl NEW: ISO C 9x
5822 passwd2des NEW: Secure RPC
5824 pow10f NEW: GNU ext.
5825 pow10l NEW: GNU ext.
5828 printf_size NEW: GNU ext.
5829 printf_size_info NEW: GNU ext.
5830 profil_counter REMOVED
5831 pthread_mutexattr_getkind_np REPLACED
5832 pthread_mutexattr_setkind_np REPLACED
5833 ptsname NEW: Unix98 PTY
5834 ptsname_r NEW: Unix98 PTY
5836 putchar_locked REMOVED
5837 putgrent NEW: GNU ext.
5839 putpmsg NEW: STREAMS
5840 pututxline NEW: Unix98
5844 readdir64_r NEW: LFS
5845 remquo NEW: ISO C 9x
5846 remquof NEW: ISO C 9x
5847 remquol NEW: ISO C 9x
5849 roundf NEW: ISO C 9x
5850 roundl NEW: ISO C 9x
5852 scalbln NEW: ISO C 9x
5853 scalblnf NEW: ISO C 9x
5854 scalblnl NEW: ISO C 9x
5856 sendfile NEW: kernel
5857 setcontext NEW: Unix98
5858 setrlimit64 NEW: LFS
5859 setutxent NEW: Unix98
5861 sigignore NEW: Unix98
5862 sigqueue NEW: POSIX.1b
5863 sigrelse NEW: Unix98
5864 sigset NEW: POSIX.1b
5865 sigtimedwait NEW: POSIX.1b
5866 sigwaitinfo NEW: POSIX.1b
5867 sincos NEW: GNU ext.
5868 sincosf NEW: GNU ext.
5869 sincosl NEW: GNU ext.
5873 strcasestr NEW: GNU ext.
5874 strtoimax NEW: ISO C 9x
5875 strtoumax NEW: ISO C 9x
5876 strverscmp NEW: GNU ext.
5877 svcauthdes_stats NEW: Secure RPC
5878 svcunix_create NEW: sunrpc etx
5879 svcunixfd_create NEW: sunrpc ext
5880 swapcontext NEW: Unix98
5881 tcgetsid NEW: Unix98 PTY
5882 tdestroy NEW: GNU ext.
5883 tgamma NEW: ISO C 9x
5884 tgammaf NEW: ISO C 9x
5885 tgammal NEW: ISO C 9x
5889 truncf NEW: ISO C 9x
5890 truncl NEW: ISO C 9x
5892 unlockpt NEW: Unix98 PTY
5893 updwtmpx NEW: Unix98
5894 user2netname NEW: Secure RPC
5895 utmpxname NEW: Unix98
5896 versionsort NEW: GNU ext.
5897 versionsort64 NEW: GNU ext.
5899 wcscasecmp NEW: GNU ext.
5900 wcsncasecmp NEW: GNU ext.
5901 wcsnlen NEW: GNU ext.
5902 wcstoimax NEW: ISO C 9x
5903 wcstoll NEW: ISO C 9x
5904 wcstoull NEW: ISO C 9x
5905 wcstoumax NEW: ISO C 9x
5907 wordexp NEW: POSIX.2
5908 wordfree NEW: POSIX.2
5909 write_profiling REMOVED
5910 xdecrypt NEW: Secure RPC
5911 xdr_authdes_cred NEW: Secure RPC
5912 xdr_authdes_verf NEW: Secure RPC
5913 xdr_cryptkeyarg NEW: Secure RPC
5914 xdr_cryptkeyarg2 NEW: Secure RPC
5915 xdr_cryptkeyres NEW: Secure RPC
5916 xdr_getcredres NEW: Secure RPC
5917 xdr_key_netstarg NEW: Secure RPC
5918 xdr_key_netstres NEW: Secure RPC
5919 xdr_keybuf NEW: Secure RPC
5920 xdr_keystatus NEW: Secure RPC
5921 xdr_netnamestr NEW: Secure RPC
5922 xdr_sizeof NEW: Secure RPC
5923 xdr_unixcred NEW: sunrpc ext
5924 xencrypt NEW: Secure RPC
5925 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5936 * inet_ntoa is thread-safe
5938 * updwtmp is moved from libutil to libc
5940 * rewrite of cbrt function
5942 * update of timezone data
5956 * add atoll function
5958 * fix complex problems in Berkeley DB code
5960 * fix math functions
5964 * fixed lots of header problems (especially Linux/GNU specific)
5966 * dynamic loader preserves all registers
5968 * Roland McGrath provided support for handling of auxiliary objects in
5969 the ELF dynamic loader.
5971 * support for parallel builds is improved
5975 * GNU extensions are no longer declared by default. To enable them you
5976 must define the macro `_GNU_SOURCE' in your program or compile with
5979 * The library has changed from using GNU ld symbol aliases to using weak
5980 symbols where available. The ELF object file format supports weak
5981 symbols; GNU ld also supports weak symbols in the a.out format. (There
5982 is also now support for other GNU ld extensions in ELF. Use the
5983 `--with-elf' option to configure to indicate you have ELF, and
5984 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5985 of many files which contained only symbol aliases, reducing the size of
5986 the source and the compiled library; many other files were renamed to
5987 less cryptic names previously occupied by the symbol alias files.
5988 There is a new header file <elf.h> for programs which operate on
5989 files in the ELF format.
5991 * Converted to Autoconf version 2, so `configure' has more options.
5992 Run `configure --help' to see the details.
5994 * The library can now be configured to build profiling, highly-optimized
5995 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5996 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5997 `configure' enable building these extra libraries. The shared library is
5998 built by default when using both ELF and GNU ld. When shared libraries
5999 are enabled, the new library `-ldl' is available for arbitrary run-time
6000 loading of shared objects; its interface is defined in <dlfcn.h>. The
6001 new header file <link.h> gives access to the internals of the run-time
6002 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6003 application of same name on other systems and it provides information
6004 about dynamically linked binaries.
6006 * The C library now provides the run-time support code for profiling
6007 executables compiled with `-pg'. Programs can control the profiling code
6008 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6009 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6010 the support for this file format was contributed by David Mosberger-Tang.
6012 * The math code has been replaced with a math library based on fdlibm from
6013 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6014 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6015 functions. The math functions now reside in a separate library, so
6016 programs using them will need to use `-lm' their linking commands.
6018 * John C. Bowman contributed optimized ix87 assembler inline functions.
6020 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6021 mechanism similar to that found in Solaris 2. This is now used for the
6022 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6023 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6024 file controls what services are used for each individual database. This
6025 works by loading shared libraries with names specified in `nsswitch.conf',
6026 so service modules can be changed or added at any time without even
6027 relinking any program. Currently there are the file, db, and NIS based
6028 NSS services available.
6030 * The new functions `strtoq' and `strtouq' parse integer values from
6031 strings, like `strtol' and `strtoul', but they return `long long int' and
6032 `unsigned long long int' values, respectively (64-bit quantities).
6034 * The new functions `strtof' and `strtold' parse floating-point values from
6035 strings, like `strtod', but they return `float' and `long double' values,
6036 respectively (on some machines `double' and `long double' are the same).
6038 * Ulrich Drepper has contributed new implementations of the floating-point
6039 printing and reading code used in the `printf' family of functions and
6040 `strtod', `strtof', and `strtold'. These new functions are perfectly
6041 accurate, and much faster than the old ones.
6043 * The implementation of the POSIX locale model was completely rewritten by
6044 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6045 to compile the POSIX locale definition.
6047 * The former dummy implementations of the strcoll and strxfrm function are
6048 now replaced by fully functional code contributed by Ulrich Drepper. The
6049 collation information comes from the POSIX locale definitions.
6051 * The new header <langinfo.h> defines an interface for accessing
6052 various locale-dependent data (using the locale chosen with `setlocale').
6054 * Ulrich Drepper has contributed a new suite of functions for operation on
6055 wide-character and multibyte-character strings, in <wchar.h>;
6056 and classification and case conversion of wide characters, in <wctype.h>.
6057 These new functions are conforming to the ISO C, Amendement 1 specification.
6059 * There is now a second implementation of the standard I/O library available.
6060 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6061 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6063 * You can now use positional parameter specifications in format strings
6064 for the `printf' and `scanf' families of functions. For example,
6065 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6066 ``Number 6, Mr Jones''. This is mainly useful when providing different
6067 format strings for different languages, whose grammars may dictate
6068 different orderings of the values being printed. To support this
6069 feature, the interface for `register_printf_handler' has changed; see
6070 the header file <printf.h> for details.
6072 * The `printf' and `scanf' families of functions now understand a new
6073 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6074 to group numbers as indicated by the locale; for `scanf' and friends, this
6075 says to accept as valid only a number with all the proper grouping
6076 separators in the right places. In the default "C" locale, numbers are
6077 not grouped; but locales for specific countries will define the usual
6078 conventions (i.e. separate thousands with `,' in the US locale).
6080 * The pgrp functions have been regularized, slightly incompatibly but much
6081 less confusingly. The core functions are now `getpgid' and `setpgid',
6082 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6083 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6084 provided for compatibility. There is no longer an incompatible `getpgrp'
6085 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6087 * The new header file <fts.h> and suite of functions simplify programs that
6088 operate on directory trees. This code comes from 4.4 BSD.
6090 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6091 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6092 NSS scheme used in glibc.
6094 * There is a new malloc debugging hook `__memalign_hook'.
6096 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6097 `unsigned int' in <sys/types.h>. These are for compatibility only and
6098 their use is discouraged.
6100 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6101 done differently, so that it works even without GNU ld.
6103 * New function `euidaccess' checks allowed access to a file like `access',
6104 but using the effective IDs instead of the real IDs.
6106 * The time zone data files have been updated for the latest and greatest
6107 local time conventions of the countries of the world.
6109 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6112 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6113 for formatting floating-point numbers. They are provided only for
6114 compatibility; new programs should use `sprintf' instead. There are
6115 also equivalent function for the `long double' floating-point type and
6116 all functions also exist in a reentrant form.
6118 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6119 functions for maintaining the login-record files (primarily of use to
6120 system programs such as `login'), and convenient functions for
6121 allocating and initializing a pseudo-terminal (pty) device.
6123 * Ulrich Drepper has contributed new support for System V style
6124 shared memory and IPC on systems that support it.
6126 * Ulrich Drepper has contributed several miscellaneous new functions found
6127 in System V: The `hsearch' family of functions provide an effective
6128 implementation of hash tables; `a64l' and `l64a' provide a very simple
6129 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6132 * Ulrich Drepper has contributed new reentrant counterparts for the
6133 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6135 * Ulrich Drepper has contributed new, highly-optimized versions of several
6136 string functions for the i486/Pentium family of processors.
6138 * Ulrich Drepper has updated the Linux-specific code, based largely
6139 on work done in Hongjiu Lu's version of GNU libc for Linux.
6140 The GNU library now supports Linux versions 2.0.10 and later,
6141 using the ELF object file format (i[3456]86-*-linux).
6143 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6145 * David Mosberger-Tang and Richard Henderson have ported the C library
6146 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6147 dynamic linking support for ELF/Alpha.
6149 * Richard Henderson contributed several Alpha optimized assembler function
6150 for arithmetic and string handling.
6152 * Ulrich Drepper has contributed a new set of message catalog functions to
6153 support multiple languages using the <libintl.h> interface, for use with
6154 his new package GNU gettext. Translation volunteers have contributed
6155 catalogs of the library's messages in Spanish, German, and Korean.
6157 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6158 program and the `catgets' function for reading the catalog files it
6159 creates. (The <libintl.h> interface is preferred; we include the
6160 <nl_types.h> interface using `catgets' only for source compatibility with
6161 programs already written to use it.)
6163 * New header file <values.h> gives SVID-compatible names for <limits.h>
6166 * Various new macros, declarations, and small header files for compatibility
6169 * New function `group_member' is a convenient way to check if a process has
6170 a given effective group ID.
6172 * When using GCC 2.7 and later, the socket functions are now declared in a
6173 special way so that passing an argument of type `struct sockaddr_in *',
6174 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6175 `struct sockaddr *' type, does not generate a type-clash warning.
6177 * New function `error' declared in header file <error.h> is a convenient
6178 function for printing error messages and optionally exiting; this is the
6179 canonical function used in GNU programs. The new functions `err', `warn',
6180 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6181 doing the same thing.
6183 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6184 POSIX.2 `glob' function to do ~ and {...} expansion.
6186 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6187 `clearenv' which is used in POSIX.9 is also available.
6189 * New function `getsid' returns session ID number on systems that support it.
6191 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6192 files <db.h> and <mpool.h> provide a rich set of functions for several
6193 types of simple databases stored in memory and in files, and <ndbm.h> is
6194 an old `ndbm'-compatible interface using the `db' functions. Link with
6195 `-ldb' to get these functions.
6197 * New macro `strdupa' copies a string like `strdup', but uses local stack
6198 space from `alloca' instead of dynamic heap space from `malloc'.
6200 * New function `strnlen' is like `strlen' but searches only a given maximum
6201 number of characters for the null terminator. `stpncpy', `strndup' and
6202 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6205 * New function `statfs' in header <sys/statfs.h>.
6207 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6208 provide convenient functions for operating on blocks of null-terminated
6211 * A new suite of functions in <utmp.h> handle all the details of reading
6212 and writing the utmp file.
6214 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6217 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6218 completely POSIX compliant and also implemented the extended functionality
6219 to handle alternate digit representation and alternate era date formats.
6221 * Ulrich Drepper provided an implementation of the `strptime' function
6222 defined in XPG4.2 which transforms a string into a `struct tm' value.
6224 * Paul Eggert provided the tzselect shell script as part of the timezone
6225 code. The shell script makes it easy to select the correct timezone
6228 * The implementation of the malloc family of functions is completely replaced
6229 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6230 The implementation uses the mmap function (if available) and it is
6231 optimized for the use in multi threaded programs.
6233 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6234 functions. This new functionality is usable by specifying a special
6235 salt string and it is compatible with implementation on *BSD systems.
6237 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6238 `getsubopt' to handle second level command line options, `bsd_signal'
6239 to access BSD style `signal' functionality, the obsolete `regexp' style
6242 * the `lchown' function is available on system which support this
6245 * The implementation of the shadow password handling function was contributed
6248 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6250 * POSIX.1g support was added. The <sys/select.h> header is available,
6251 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6252 implementation of `getaddrinfo'.
6256 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6258 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6259 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6261 * The new function `daemon' from 4.4 BSD is useful for server programs that
6262 want to put themselves in the background.
6264 * Joel Sherrill has contributed support for several standalone boards that
6265 run without an operating system.
6267 * `printf', `scanf' and friends now accept a `q' type modifier for long
6268 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6270 * All of the code taken from BSD (notably most of the math and networking
6271 routines) has been updated from the BSD 4.4-Lite release.
6273 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6275 * The new functions `getdomainname' and `setdomainname' fetch or change the
6276 YP/NIS domain name. These are system calls which exist on systems which
6279 * The time zone data files have been updated for the latest international
6282 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6283 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6287 * The C library now includes support for Sun RPC, from Sun's free
6288 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6289 are included. (There is still no support for YP.)
6291 * Tom Quinn has contributed a port of the C library to SGI machines running
6292 Irix 4 (mips-sgi-irix4).
6294 * The new `lockf' function is a simplified interface to the locking
6295 facilities of `fcntl', included for compatibility.
6297 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6299 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6301 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6304 * The error message printed by `assert' for a failed assertion now includes
6305 the name of the program (if using GNU ld) and the name of the calling
6306 function (with versions of GCC that support this).
6308 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6310 * The library now includes the <sys/mman.h> header file and memory
6311 management functions `mmap', `munmap', `mprotect', `msync', and
6312 `madvise', on systems that support those facilities.
6314 * The interface for `mcheck' has changed slightly: the function called to
6315 abort the program when an allocation inconsistency is detected now takes
6316 an argument that indicates the type of failure. The new function
6317 `mprobe' lets you request a consistency check for a particular block at
6318 any time (checks are normally done only when you call `free' or `realloc'
6321 * It is now possible to easily cross-compile the C library, building on one
6322 system a library to run on another machine and/or operating system. All
6323 you need to do is set the variable `HOST_CC' in `configparms' to the
6324 native compiler for programs to run on the machine you are building on (a
6325 few generator programs are used on Unix systems); set `CC' to the
6328 * The new function `fexecve' (only implemented on the GNU system) executes
6329 a program file given a file descriptor already open on the file.
6333 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6334 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6336 * You can set the variable `libprefix' in `configparms' to specify a prefix
6337 to be prepended to installed library files; this makes it easy to install
6338 the GNU C library to be linked as `-lgnuc' or whatever.
6340 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6341 copies a limited number of characters from a string, and returns the
6342 address of the last character written.
6344 * You no longer need to check for whether the installed `stddef.h' is
6345 compatible with the GNU C library. configure now checks for you.
6347 * You can now define a per-stream `fileno' function to convert the
6348 stream's cookie into an integral file descriptor.
6350 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6351 allocates zero bytes of storage, and returns a unique pointer which
6352 you can pass to `realloc' or `free'. The behavior is undefined if
6353 you dereference this pointer.
6355 * The C library now runs on Sony NEWS m68k machines running either
6356 NewsOS 3 or NewsOS 4.
6358 * The new `syscall' function is a system-dependent primitive function
6359 for invoking system calls. It has the canonical behavior on Unix
6360 systems, including unreliable return values for some calls (such as
6361 `pipe', `fork' and `getppid').
6363 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6364 to `EAGAIN', which is the preferred name. On systems whose kernels
6365 use two distinct codes, the C library now translates EWOULDBLOCK to
6366 EAGAIN in every system call function.
6370 * The GNU C Library Reference Manual is now distributed with the library.
6371 `make dvi' will produce a DVI file of the printed manual.
6372 `make info' will produce Info files that you can read on line using C-h i
6373 in Emacs or the `info' program.
6374 Please send comments on the manual to bug-glibc-manual@gnu.org.
6376 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6378 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6380 * Jason Merrill has contributed a port to the Sequent Symmetry running
6381 Dynix version 3 (i386-sequent-dynix).
6383 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6384 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6386 * New function `memory_warnings' lets you arrange to get warnings when
6387 malloc is running out of memory to allocate, like Emacs gives you.
6389 * The C library now contains the relocating allocator used in Emacs 19 for
6390 its editing buffers. This allocator (ralloc) minimizes allocation
6391 overhead and fragmentation by moving allocated regions around whenever it
6392 needs to. You always refer to a ralloc'd region with a "handle" (a
6393 pointer to a pointer--an object of type `void **').
6395 * There is a new `printf' format: `%m' gives you the string corresponding
6396 to the error code in `errno'.
6398 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6399 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6400 pass, the `a' modifier says to fill in a `char **' you pass with a
6403 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6404 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6405 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6407 * `mkstemp' is a traditional Unix function to atomically create and open a
6408 uniquely-named temporary file.
6412 * The standard location for the file that says what the local timezone is
6413 has changed again. It is now `/usr/local/etc/localtime' (or more
6414 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6416 * The distribution no longer contains any files with names longer than 14
6419 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6420 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6422 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6426 * The configuration process has changed quite a bit. The `configure'
6427 script is now used just like the configuration scripts for other GNU
6428 packages. The `sysdeps' directory hierarchy is much rearranged.
6429 The file `INSTALL' explains the new scheme in detail.
6431 * The header files no longer need to be processed into ANSI C and
6432 traditional C versions. There is just one set of files to install, and
6433 it will work with ANSI or old C compilers (including `gcc -traditional').
6435 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6436 MIPS DECStation running Ultrix 4.
6438 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6439 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6440 made itself into a shared library.
6442 * Yet further improved support for the i386, running 4.3 BSD-like systems
6443 (such as Mach 3 with the Unix single-server), or System V.
6445 * New function `strncasecmp' to do case-insensitive string comparison
6446 with limited length.
6448 * New function `strsep' is a reentrant alternative to `strtok'.
6450 * New functions `scandir' and `alphasort' for searching directories.
6452 * New function `setenv' is a better interface to `putenv'.
6454 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6455 function for traversing a directory tree.
6457 * The GNU obstack package is now also part of the C library.
6458 The new function `open_obstack_stream' creates a stdio stream that
6459 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6460 formatted output directly to an obstack.
6462 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6463 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6465 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6467 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6468 things to your strings.
6470 * There are some new test programs: test-fseek, testmb, and testrand.
6472 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6473 These ports are not finished, but are a good starting place for really
6474 supporting those systems.
6476 * `/etc/localtime' is now the standard location for the file that says what
6477 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6478 This follows the general principle that `/etc' is the place for all local
6479 configuration files.
6481 * The C library header files now use `extern "C"' when used by the C++
6482 compiler, so the C library should now work with C++ code.
6484 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6485 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6488 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6489 function which uses the `merge sort' algorithm, and is said to be
6490 significantly faster than the old GNU `qsort' function. Merge sort is
6491 now the standard `qsort' function. The new algorithm can require a lot
6492 of temporary storage; so, the old sorting function is called when the
6493 required storage is not available.
6495 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6496 provides the Unix `crypt' function, plus some other entry points.
6498 * The code and header files taken from 4.4 BSD have been updated with the
6499 latest files released from Berkeley.
6501 ----------------------------------------------------------------------
6504 Permission is granted to anyone to make or distribute verbatim copies
6505 of this document as received, in any medium, provided that the
6506 copyright notice and this permission notice are preserved,
6507 thus giving the recipient permission to redistribute in turn.
6509 Permission is granted to distribute modified versions
6510 of this document, or of portions of it,
6511 under the above conditions, provided also that they
6512 carry prominent notices stating who last changed them.
6515 version-control: never