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 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
13 PTHREAD_STACK_MIN is no longer constant and is redefined to
14 sysconf(_SC_THREAD_STACK_MIN).
16 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
17 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
18 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
19 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
21 * The dynamic linker implements the --list-diagnostics option, printing
22 a dump of information related to IFUNC resolver operation and
23 glibc-hwcaps subdirectory selection.
25 * On Linux, the function execveat has been added. It operates similar to
26 execve and it is is already used to implement fexecve without requiring
27 /proc to be mounted. However, different than fexecve, if the syscall is not
28 supported by the kernel an error is returned instead of trying a fallback.
30 * The ISO C2X function timespec_getres has been added.
32 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
33 C2X, is supported to enable declarations of functions defined in Annex F
34 of C2X. Those declarations are also enabled when
35 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
36 defined, and when _GNU_SOURCE is defined.
38 * On powerpc64*, glibc can now be compiled without scv support using the
39 --disable-scv configure option.
41 * Add support for 64-bit time_t on configurations like x86 where time_t
42 is traditionally 32-bit. Although time_t still defaults to 32-bit on
43 these configurations, this default may change in future versions.
44 This is enabled with the _TIME_BITS preprocessor set to 64 and only
45 supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is only
46 enabled for Linux and the full support requires a minimum version of 5.1.
48 * The main gconv-modules file in glibc now contains only a small set of
49 essential converter modules and the rest have been moved into a supplementary
50 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
51 in the same GCONV_PATH. Similarly, external converter modules directories
52 may have supplementary configuration files in a gconv-modules.d directory
53 with names ending with .conf to logically classify the converter modules in
56 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
57 to configure the size of the thread stack cache.
59 * The function _Fork has been added as an async-signal-safe fork replacement
60 since Austin Group issue 62 droped the async-signal-safe requirement for
61 fork (and it will be included in the future POSIX standard). The new _Fork
62 function does not run any atfork function neither resets any internal state
63 or lock (such as the malloc one), and only sets up a minimal state required
64 to call async-signal-safe functions (such as raise or execve). This function
65 is currently a GNU extension.
67 * On Linux, the close_range function has been added. It allows efficiently
68 closing a range of file descriptors on recent kernels (version 5.9).
70 * The function closefrom has been added. It closes all file descriptors
71 greater than given integer. This function is a GNU extension, although it
72 also present in other systems.
74 * The posix_spawn_file_actions_closefrom_np function has been added, enabling
75 posix_spawn and posix_spawnp to close all file descriptors great than or
76 equal to a giver integer. This function is a GNU extension, although
77 Solaris also provides a similar function.
79 Deprecated and removed features, and other changes affecting compatibility:
81 * The function pthread_mutex_consistent_np has been deprecated; programs
82 should use the equivalent standard function pthread_mutex_consistent
85 * The function pthread_mutexattr_getrobust_np has been deprecated;
86 programs should use the equivalent standard function
87 pthread_mutexattr_getrobust instead.
89 * The function pthread_mutexattr_setrobust_np has been deprecated;
90 programs should use the equivalent standard function
91 pthread_mutexattr_setrobust instead.
93 * The function pthread_yield has been deprecated; programs should use
94 the equivalent standard function sched_yield instead.
96 * The pthread cancellation handler is now installed with SA_RESTART and
97 pthread_cancel will always send the internal SIGCANCEL on a cancellation
98 request. It should not be visible to application since the cancellation
99 handler should either act upon cancellation (if asynchronous cancellation
100 is enabled) or ignore the cancellation internal signal. However there are
101 buggy kernel interfaces (for instance some CIFS version) that could still
102 see spurious EINTR error when cancellation interrupts a blocking syscall.
104 * Previously, glibc installed its various shared objects under versioned
105 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
106 were provided as symbolic links. Starting with glibc 2.34, the shared
107 objects are installed under their ABI sonames directly, without
108 symbolic links. This increases compatibility with distribution
109 package managers that delete removed files late during the package
110 upgrade or downgrade process.
112 * The symbols mallwatch and tr_break are now deprecated and no longer used in
113 mtrace. Similar functionality can be achieved by using conditional
114 breakpoints within mtrace functions from within gdb.
116 Changes to build and runtime requirements:
118 * On Linux, the shm_open, sem_open, and related functions now expect the
119 file shared memory file system to be mounted at /dev/shm. These functions
120 no longer search among the system's mount points for a suitable
121 replacement if /dev/shm is not available.
123 Security related changes:
125 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
126 a request for netgroup lookup, may crash due to a double-free,
127 potentially resulting in degraded service or Denial of Service on the
128 local system. Reported by Chris Schanzle.
130 CVE-2021-33574: The mq_notify function has a potential use-after-free
131 issue when using a notification type of SIGEV_THREAD and a thread
132 attribute with a non-default affinity mask.
134 The following bugs are resolved with this release:
136 [The release manager will add the list generated by
137 scripts/list-fixed-bugs.py just before the release.]
144 * The dynamic linker accepts the --list-tunables argument which prints
145 all the supported tunables. This option is disable if glibc is
146 configured with tunables disabled (--enable-tunables=no).
148 * The dynamic linker accepts the --argv0 argument and provides opportunity
149 to change argv[0] string.
151 * The dynamic linker loads optimized implementations of shared objects
152 from subdirectories under the glibc-hwcaps directory on the library
153 search path if the system's capabilities meet the requirements for
154 that subdirectory. Initially supported subdirectories include
155 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
156 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
157 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
158 subdirectory names correspond to the vendor-independent x86-64
159 microarchitecture levels defined in the x86-64 psABI supplement.
161 * The new --help option of the dynamic linker provides usage and
162 information and library search path diagnostics.
164 * The mallinfo2 function is added to report statistics as per mallinfo,
165 but with larger field widths to accurately report values that are
166 larger than fit in an integer.
168 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
170 * Support for the RISC-V ISA running on Linux has been expanded to run on
171 32-bit hardware. This is supported for the following ISA and ABI pairs:
177 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
180 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
181 glibc may use additional checks that may have an additional performance
182 overhead. At present these checks are available only on LLVM 9 and later.
183 The latest GCC available at this time (10.2) does not support this level of
186 Deprecated and removed features, and other changes affecting compatibility:
188 * The mallinfo function is marked deprecated. Callers should call
191 * When dlopen is used in statically linked programs, alternative library
192 implementations from HWCAP subdirectories are no longer loaded.
193 Instead, the default implementation is used.
195 * The deprecated <sys/vtimes.h> header and the function vtimes have been
196 removed. To support old binaries, the vtimes function continues to exist
197 as a compatibility symbol. Applications should use the getrlimit or
200 * Following a change in the tzdata 2018a release upstream, the zdump
201 program is now installed in the /usr/bin subdirectory. Previously,
202 the /usr/sbin subdirectory was used.
204 * On s390(x), the type float_t is now derived from the macro
205 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
206 hardcoded to double. This does not affect the ABI of any libraries
207 that are part of the GNU C Library, but may affect the ABI of other
208 libraries that use this type in their interfaces. The new definition
209 improves consistency with compiler behavior in many scenarios.
211 * A future version of glibc will stop loading shared objects from the
212 "tls" subdirectories on the library search path, the subdirectory that
213 corresponds to the AT_PLATFORM system name, and also stop employing
214 the legacy AT_HWCAP search mechanism. Applications should switch to
215 the new glibc-hwcaps mechanism instead; if they do not do that, only
216 the baseline version (directly from the search path directory) will be
219 Changes to build and runtime requirements:
221 * On Linux, the system administrator needs to configure /dev/pts with
222 the intended access modes for pseudo-terminals. glibc no longer
223 attemps to adjust permissions of terminal devices. The previous glibc
224 defaults ("tty" group, user read/write and group write) already
225 corresponded to what most systems used, so that grantpt did not
226 perform any adjustments.
228 * On Linux, the posix_openpt and getpt functions no longer attempt to
229 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
230 (and pseudo-terminals are supported), a devpts file system is mounted
231 on /dev/pts. Current systems already meet these requirements.
233 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
235 Security related changes:
237 CVE-2021-3326: An assertion failure during conversion from the
238 ISO-20220-JP-3 character set using the iconv function has been fixed.
239 This assertion was triggered by certain valid inputs in which the
240 converted output contains a combined sequence of two wide characters
241 crossing a buffer boundary. Reported by Tavis Ormandy.
243 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
244 invoked with input containing redundant shift sequences in the IBM1364,
245 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
247 CVE-2020-29562: An assertion failure has been fixed in the iconv function
248 when invoked with UCS4 input containing an invalid character.
250 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
251 invoked with EUC-KR input containing invalid multibyte input sequences.
253 The following bugs are resolved with this release:
255 [10635] libc: realpath portability patches
256 [16124] dynamic-link: ld.so should allow to change argv[0]
257 [17924] malloc: 'free' should not set errno
258 [18683] libc: Linux faccessat implementation can incorrectly ignore
260 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
261 [23091] hurd: missing waitid support
262 [23249] libc: Epyc and other current AMD CPUs do not select the
263 "haswell" platform subdirectory
264 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
266 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
268 [24941] libc: Make grantpt usable after multi-threaded fork in more
270 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
271 [24973] locale: iconv encounters segmentation fault when converting
272 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
273 [25399] string: undefined reference to `__warn_memset_zero_len' when
274 changing gnuc version
275 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
277 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
279 [25971] libc: s390 bits/hwcap.h out of sync with kernel
280 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
281 [26100] libc: Race in syslog(3) with regards to tag printing.
282 [26124] libc: Export <cpu-features.h>
283 [26130] nscd: Inconsistent nscd cache during pruning
284 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
285 [26224] locale: iconv hangs when converting some invalid inputs from
286 several IBM character sets (CVE-2020-27618)
287 [26341] libc: realpath cyclically call __alloca(path_max) to consume
289 [26343] manual: invalid documented return type for strerrorname_np(),
290 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
291 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
293 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
295 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
296 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
298 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
299 [26553] libc: mtx_init allows type set to "mtx_recursive" only
300 [26555] string: strerrorname_np does not return the documented value
301 [26592] libc: pointer arithmetic overflows in realpath
302 [26600] network: Transaction ID collisions cause slow DNS lookups in
304 [26606] libc: [2.33 Regression] pselect is broken on x32
305 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
306 [26620] glob: fnmatch with collating symbols results in segmentation
308 [26625] libc: [2.33 Regression] CET is disabled
309 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
310 at the end of a memory mapping
311 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
312 by the caller to the kernel
313 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
314 [26647] build: [-Werror=array-parameter=] due to different
315 declarations for __sigsetjmp
316 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
318 [26649] stdio: printf should handle non-normal x86 long double numbers
319 gracefully (CVE-2020-29573)
320 [26686] build: -Warray-parameter instances building with GCC 11
321 [26687] build: -Warray-bounds instances building with GCC 11
322 [26690] stdio: Aliasing violation in __vfscanf_internal
323 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
324 [26726] build: GCC warning calling new_composite_name with an array of
326 [26736] libc: FAIL: misc/tst-sysvshm-linux
327 [26737] libc: Random FAIL: rt/tst-shm
328 [26791] libc: Missing O_CLOEXEC in sysconf.c
329 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
331 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
333 [26818] string: aarch64: string tests may run ifunc variants that are
335 [26821] libc: Memory leak test failures on Fedora 33
336 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
337 FSGSBASE/LM/RDRAND check failure
338 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
340 [26853] libc: aarch64: Missing unwind information in statically linked
342 [26923] locale: Assertion failure in iconv when converting invalid
343 UCS4 (CVE-2020-29562)
344 [26926] dynamic-link: aarch64: library dependencies are not bti
346 [26932] libc: sh: Multiple floating point functions defined as stubs
348 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
350 [26988] dynamic-link: aarch64: BTI mprotect address is not page
352 [27002] build: libc_freeres_fn build failure with GCC 11
353 [27004] dynamic-link: ld.so is miscompiled by GCC 11
354 [27008] dynamic-link: ld.so.cache should have endianness markup
355 [27042] libc: [alpha] anonymous union in struct stat confuses
357 [27053] libc: Conformance regression in system(3) (and probably also
359 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
361 [27077] network: Do not reload /etc/nsswitch.conf from chroot
362 [27083] libc: Unsafe unbounded alloca in addmntent
363 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
365 [27130] string: "rep movsb" performance issue
366 [27150] libc: alpha: wait4() is unavailable in static linking
367 [27177] dynamic-link:
368 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
370 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
371 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
372 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
373 related to combining characters (CVE-2021-3326)
380 * Unicode 13.0.0 Support: Character encoding, character type info, and
381 transliteration tables are all updated to Unicode 13.0.0, using
382 generator scripts contributed by Mike FABIAN (Red Hat).
384 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
386 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
387 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
388 Three ABIs are supported:
394 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
395 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
397 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
398 DT_DEPAUDIT dynamic section entries of the main executable.
400 * powerpc64le supports IEEE128 long double libm/libc redirects when
401 using -mabi=ieeelongdouble to compile C code on supported GCC
402 toolchains. It is recommended to use GCC 8 or newer when testing
405 * To help detect buffer overflows and other out-of-bounds accesses
406 several APIs have been annotated with GCC 'access' attribute. This
407 should help GCC 10 issue better warnings.
409 * On Linux, functions pthread_attr_setsigmask_np and
410 pthread_attr_getsigmask_np have been added. They allow applications
411 to specify the signal mask of a thread created with pthread_create.
413 * The GNU C Library now provides the header file <sys/single_threaded.h>
414 which declares the variable __libc_single_threaded. Applications are
415 encouraged to use this variable for single-thread optimizations,
416 instead of weak references to symbols historically defined in
419 * The functions sigabbrev_np and sigdescr_np have been added. The
420 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
421 SIGHUP) while sigdescr_np returns a string describing the signal number
422 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
423 attempt to translate the return description, both functions return
424 NULL for an invalid signal number.
426 They should be used instead of sys_siglist or sys_sigabbrev and they
427 are both thread and async-signal safe. These functions are GNU extensions.
429 * The functions strerrorname_np and strerrordesc_np have been added. The
430 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
431 while strerrordesc_np returns a string describing the error number
432 (e.g "Invalid argument" for EINVAL). Different than strerror,
433 strerrordesc_np does not attempt to translate the return description, both
434 functions return NULL for an invalid error number.
436 They should be used instead of sys_errlist and sys_nerr, both are
437 thread and async-signal safe. These functions are GNU extensions.
439 * AArch64 now supports standard branch protection security hardening
440 in glibc when it is built with a GCC that is configured with
441 --enable-standard-branch-protection (or if -mbranch-protection=standard
442 flag is passed when building both GCC target libraries and glibc,
443 in either case a custom GCC is needed). This includes branch target
444 identification (BTI) and pointer authentication for return addresses
445 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
446 extensions respectively for the protection to be effective,
447 otherwise the used instructions are nops. User code can use PAC-RET
448 without libc support, but BTI requires a libc that is built with BTI
449 support, otherwise runtime objects linked into user code will not be
452 Deprecated and removed features, and other changes affecting compatibility:
454 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
455 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
456 RPC header files. Backward compatibility for old programs is kept
457 only for architectures and ABIs that have been added in or before
458 glibc 2.31. New programs need to use TI-RPC
459 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
460 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
462 * Remove configure option --enable-obsolete-nsl. libnsl is only built
463 as shared library for backward compatibility and the NSS modules "nis"
464 and "nisplus" are not built at all and libnsl's headers aren't
465 installed. This compatibility is kept only for architectures and ABIs
466 that have been added in or before version 2.28. Replacement
467 implementations based on TI-RPC, which additionally support IPv6, are
468 available from <https://github.com/thkukuk/>. This change does not
469 affect the "compat" NSS module, which does not depend on libnsl
470 since 2.27 and thus can be used without NIS.
472 * The deprecated <sys/sysctl.h> header and the sysctl function have been
473 removed. To support old binaries, the sysctl function continues to
474 exist as a compatibility symbol (on those architectures which had it),
475 but always fails with ENOSYS. This reflects the removal of the system
476 call from all architectures, starting with Linux 5.5.
478 * The sstk function is no longer available to newly linked binaries.
479 Its implementation always returned with a failure, and the function
480 was not declared in any header file.
482 * The legacy signal handling functions siginterrupt, sigpause, sighold,
483 sigrelse, sigignore and sigset, and the sigmask macro have been
484 deprecated. Applications should use the sigsuspend, sigprocmask and
485 sigaction functions instead.
487 * ldconfig now defaults to the new format for ld.so.cache. glibc has
488 already supported this format for almost 20 years.
490 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
491 are no longer available to newly linked binaries, and their declarations
492 have been removed from <string.h>. They are exported solely as
493 compatibility symbols to support old binaries. All programs should use
496 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
497 are no longer available to newly linked binaries, and their declarations
498 have been removed from <stdio.h>. They are exported solely as
499 compatibility symbols to support old binaries. All programs should use
500 strerror or strerror_r instead.
502 * Both strerror and strerror_l now share the same internal buffer in the
503 calling thread, meaning that the returned string pointer may be invalided
504 or contents might be overwritten on subsequent calls in the same thread or
505 if the thread is terminated. It makes strerror MT-safe.
507 * Using weak references to libpthread functions such as pthread_create
508 or pthread_key_create to detect the singled-threaded nature of a
509 program is an obsolescent feature. Future versions of glibc will
510 define pthread_create within libc.so.6 itself, so such checks will
511 always flag the program as multi-threaded. Applications should check
512 the __libc_single_threaded variable declared in
513 <sys/single_threaded.h> instead.
515 * The "files" NSS module no longer supports the "key" database (used for
516 secure RPC). The contents of the /etc/publickey file will be ignored,
517 regardless of the settings in /etc/nsswitch.conf. (This method of
518 storing RPC keys only supported the obsolete and insecure AUTH_DES
519 flavor of secure RPC.)
521 * The __morecore and __after_morecore_hook malloc hooks and the default
522 implementation __default_morecore have been deprecated. Applications
523 should use malloc interposition to change malloc behavior, and mmap to
524 allocate anonymous memory. A future version of glibc may require that
525 applications which use the malloc hooks must preload a special shared
526 object, to enable the hooks.
528 * The hesiod NSS module has been deprecated and will be removed in a
529 future version of glibc. System administrators are encouraged to
530 switch to other approaches for networked account databases, such as
533 Changes to build and runtime requirements:
535 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
536 long double redirects.
538 Security related changes:
540 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
541 invoked with the -c option and when processing invalid multi-byte input
542 sequences. Reported by Jan Engelhardt.
544 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
545 corruption when they were passed a pseudo-zero argument. Reported by Guido
546 Vranken / ForAllSecure Mayhem.
548 CVE-2020-1752: A use-after-free vulnerability in the glob function when
549 expanding ~user has been fixed.
551 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
552 memmove functions has been fixed. Discovered by Jason Royes and Samual
553 Dytrych of the Cisco Security Assessment and Penetration Team (See
556 The following bugs are resolved with this release:
558 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
559 [10441] manual: Backtraces code example lacks error checking
560 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
561 timer_sigev_thread dangerous
562 [14231] stdio: stdio-common tests memory requirements
563 [14578] libc: /proc-based emulation for lchmod, fchmodat
564 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
565 filtee has constructor
566 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
567 sequences (CVE-2016-10228)
568 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
569 character entities for infinity & pi
570 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
571 segfaults in applications
572 [20543] libc: Please move from .gnu.linkonce to comdat
573 [22489] network: gcc warns about implicit convertion in
574 ICMP6_FILTER_SETPASS with -Wsign-conversion
575 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
576 [23294] math: Complex _FloatN functions are redirected to the wrong
577 function with -mlong-double-64
578 [23296] libc: Data race in setting function descriptor during lazy
580 [23668] dynamic-link: ldconfig: Default to the new format for
582 [23819] hurd: hurd: Add C11 thread support
583 [23990] build: test-container error out on failure to exec child.
584 [23991] build: shell-container typo in run_command_array
585 [24638] manual: Error in example of parsing a template string
586 [24654] manual: Wrong declaration of wcschr in libc manual
587 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
589 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
590 dynamically loaded dsos
591 [25098] nptl: nptl: ctype classification functions are not AS-Safe
592 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
594 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
595 restore EAX, ECX and EDX
596 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
597 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
598 [25420] network: Race condition in resolv_conf.c can result in caching
599 stale configuration forever
600 [25487] math: sinl() stack corruption from crafted input
602 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
604 [25523] libc: MIPS/Linux inline syscall template is miscompiled
605 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
607 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
608 on 32 bit and old kernel
609 [25635] libc: arm: Wrong sysdep order selection for soft-fp
610 [25639] localedata: Some names of days and months wrongly spelt in
612 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
613 amount of sigset_t bytes
614 [25691] stdio: printf: memory leak when printing long multibyte
616 [25715] libc: system() returns wrong errors when posix_spawn fails
617 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
618 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
619 state for conversions that produce two Unicode code points
620 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
621 for linux x86_64 leads to livelock
622 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
623 test failures, invalid instruction in ld.so
624 [25790] glob: Typo in tst-fnmatch.input
625 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
627 [25819] localedata: Update locale data to Unicode 13.0.0
628 [25824] libc: Abnormal function of strnlen in aarch64
629 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
630 [25896] libc: Incorrect prctl
631 [25902] libc: Bad LOADARGS_N
632 [25905] dynamic-link: VSX registers are corrupted during PLT
633 resolution when glibc is built with --disable-multi-arch and --with-
635 [25933] string: Off by one error in __strncmp_avx2 when
636 length=VEC_SIZE*4 and strings are at page boundaries can cause a
638 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
639 exiting detached thread
640 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
642 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
644 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
645 [26073] math: getpayload() has wrong return value
646 [26076] dynamic-link: dlmopen crashes after failing to load
647 dependencies in audit mode
648 [26120] localedata: column width of of some Korean
649 JUNGSEONG/JONGSEONG characters wrong (should be 0)
650 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
651 [26133] libc: Incorrect need_arch_feature_F16C
652 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
654 [26149] libc: PKU is usable only if OSPKE is set
655 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
657 [26208] libc: Incorrect bit_cpu_CLFSH
658 [26210] network: Incorrect use of hidden symbols for global sunrpc
660 [26211] stdio: printf integer overflow calculating allocation size
661 [26214] stdio: printf_fp double free
662 [26215] stdio: printf_fp memory leak
663 [26232] time: FAIL: support/tst-timespec for 32-bit targets
664 [26258] nss: nss_compat should not read input files with mmap
665 [26332] string: Incorrect cache line size load causes memory
673 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
674 enable features from the draft ISO C2X standard. Only some features from
675 this draft standard are supported by the GNU C Library, and as the draft
676 is under active development, the set of features enabled by this macro is
677 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
678 by compiling with "gcc -std=gnu2x".
680 * The <math.h> functions that round their results to a narrower type now
681 have corresponding type-generic macros in <tgmath.h>, as defined in TS
682 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
683 Clarification Request 13 to TS 18661-3.
685 * The function pthread_clockjoin_np has been added, enabling join with a
686 terminated thread with a specific clock. It allows waiting against
687 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
689 * New locale added: mnw_MM (Mon language spoken in Myanmar).
691 * The DNS stub resolver will optionally send the AD (authenticated data) bit
692 in queries if the trust-ad option is set via the options directive in
693 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
694 mode, the AD bit, as provided by the name server, is available to
695 applications which call res_search and related functions. In the default
696 mode, the AD bit is not set in queries, and it is automatically cleared in
697 responses, indicating a lack of DNSSEC validation. (Therefore, the name
698 servers and the network path to them are treated as untrusted.)
700 Deprecated and removed features, and other changes affecting compatibility:
702 * The totalorder and totalordermag functions, and the corresponding
703 functions for other floating-point types, now take pointer arguments to
704 avoid signaling NaNs possibly being converted to quiet NaNs in argument
705 passing. This is in accordance with the resolution of Clarification
706 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
707 floating-point arguments directly will continue to work.
709 * The obsolete function stime is no longer available to newly linked
710 binaries, and its declaration has been removed from <time.h>.
711 Programs that set the system time should use clock_settime instead.
713 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
714 in a future version of glibc. In this release, the header still exists
715 but calling ftime will cause a compiler warning. All programs should use
716 gettimeofday or clock_gettime instead.
718 * The gettimeofday function no longer reports information about a
719 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
720 many years, as it cannot handle the full complexity of the world's
721 timezones, but hitherto we have supported it on a best-effort basis.
722 Changes required to support 64-bit time_t on 32-bit architectures have
723 made this no longer practical.
725 As of this release, callers of gettimeofday with a non-null 'tzp' argument
726 should expect to receive a 'struct timezone' whose tz_minuteswest and
727 tz_dsttime fields are zero. (For efficiency reasons, this does not always
728 happen on a few Linux-based ports. This will be corrected in a future
731 All callers should supply a null pointer for the 'tzp' argument to
732 gettimeofday. For accurate information about the time zone associated
733 with the current time, use the localtime function.
735 gettimeofday itself is obsolescent according to POSIX. We have no plans
736 to remove access to this function, but portable programs should consider
737 using clock_gettime instead.
739 * The settimeofday function can still be used to set a system-wide time
740 zone when the operating system supports it. This is because the Linux
741 kernel reused the API, on some architectures, to describe a system-wide
742 time-zone-like offset between the software clock maintained by the kernel,
743 and the "RTC" clock that keeps time when the system is shut down.
745 However, to reduce the odds of this offset being set by accident,
746 settimeofday can no longer be used to set the time and the offset
747 simultaneously. If both of its two arguments are non-null, the call
748 will fail (setting errno to EINVAL).
750 Callers attempting to set this offset should also be prepared for the call
751 to fail and set errno to ENOSYS; this already happens on the Hurd and on
752 some Linux architectures. The Linux kernel maintainers are discussing a
753 more principled replacement for the reused API. After a replacement
754 becomes available, we will change settimeofday to fail with ENOSYS on all
755 platforms when its 'tzp' argument is not a null pointer.
757 settimeofday itself is obsolescent according to POSIX. Programs that set
758 the system time should use clock_settime and/or the adjtime family of
759 functions instead. We may cease to make settimeofday available to newly
760 linked binaries after there is a replacement for Linux's time-zone-like
763 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
764 the optional CAS instruction is implemented (for instance, LEON processors
765 are still supported, but SuperSPARC processors are not).
767 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
770 * If a lazy binding failure happens during dlopen, during the execution of
771 an ELF constructor, the process is now terminated. Previously, the
772 dynamic loader would return NULL from dlopen, with the lazy binding error
773 captured in a dlerror message. In general, this is unsafe because
774 resetting the stack in an arbitrary function call is not possible.
776 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
777 executable stack unless explicitly configured at build time to require
778 minimum kernel version 4.8 or newer. This is because executing
779 floating-point branches on a non-executable stack on Linux kernels prior to
780 4.8 can lead to application crashes for some MIPS configurations. While
781 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
782 expected to enable non-executable stack by default with PT_GNU_STACK by
783 default and is thus likely to trigger a crash on older kernels.
785 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
786 non-executable stack while dropping support for older kernels.
788 * System call wrappers for time system calls now use the new time64 system
789 calls when available. On 32-bit targets, these wrappers attempt to call
790 the new system calls first and fall back to the older 32-bit time system
791 calls if they are not present. This may cause issues in environments
792 that cannot handle unsupported system calls gracefully by returning
793 -ENOSYS. Seccomp sandboxes are affected by this issue.
795 Changes to build and runtime requirements:
797 * It is no longer necessary to have recent Linux kernel headers to build
798 working (non-stub) system call wrappers on all architectures except 64-bit
799 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
801 * The ChangeLog file is no longer present in the toplevel directory of the
802 source tree. ChangeLog files are located in the ChangeLog.old directory as
803 ChangeLog.N where the highest N has the latest entries.
805 Security related changes:
807 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
808 out-of-bounds write when executed in a signal frame context.
810 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
811 environment variable during program execution after a security
812 transition, allowing local attackers to restrict the possible mapping
813 addresses for loaded libraries and thus bypass ASLR for a setuid
814 program. Reported by Marcin Kościelnicki.
816 The following bugs are resolved with this release:
818 [12031] localedata: iconv -t ascii//translit with Greek characters
819 [15813] libc: Multiple issues in __gen_tempname
820 [17726] libc: [arm, sparc] profil_counter should be compat symbol
821 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
822 [19767] libc: vdso is not used with static linking
823 [19903] hurd: Shared mappings not being inherited by children processes
824 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
825 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
827 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
828 Symbols-A/B Unicode blocks
829 [23518] libc: Eliminate __libc_utmp_jump_table
830 [24026] malloc: malloc_info() returns wrong numbers
831 [24054] localedata: Many locales are missing date_fmt
832 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
833 [24304] dynamic-link: Lazy binding failure during ELF
834 constructors/destructors is not fatal
835 [24376] libc: RISC-V symbol size confusion with _start
836 [24682] localedata: zh_CN first weekday should be Monday per GB/T
838 [24824] libc: test-in-container does not install charmap files compatible
840 [24844] regex: regex bad pointer / leakage if malloc fails
841 [24867] malloc: Unintended malloc_info formatting changes
842 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
843 [24880] libc: login: utmp implementation uses struct flock with fcntl64
844 [24882] libc: login: pututline uses potentially outdated cache
845 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
846 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
848 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
850 [24930] dynamic-link: dlopen of PIE executable can result in
851 _dl_allocate_tls_init assertion failure
852 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
853 (stringop-overflow error)
854 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
855 functions other can lead to crashes
856 [24967] libc: jemalloc static linking causes runtime failure
857 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
859 [25035] libc: sbrk() failure handled poorly in tunables_strdup
860 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
861 [25097] libc: new -Warray-bounds with GCC 10
862 [25112] dynamic-link: dlopen must not make new objects accessible when it
863 still can fail with an error
864 [25139] localedata: Please add the new mnw_MM locale
865 [25149] regex: Array bounds violation in proceed_next_node
866 [25157] dynamic-link: Audit cookie for the dynamic loader is not
867 initialized correctly
868 [25189] libc: glibc's __glibc_has_include causes issues with clang
870 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
872 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
873 binaries (CVE-2019-19126)
874 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
876 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
878 [25232] string: <string.h> does not enable const correctness for strchr et
880 [25233] localedata: Consider "." as the thousands separator for sl_SI
882 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
883 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
884 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
886 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
887 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
889 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
890 (dl_initfirst) link map pointer
891 [25401] malloc: pvalloc must not have __attribute_alloc_size__
892 [25423] libc: Array overflow in backtrace on powerpc
893 [25425] network: Missing call to __resolv_context_put in
894 getaddrinfo.c:gethosts
901 * Unicode 12.1.0 Support: Character encoding, character type info, and
902 transliteration tables are all updated to Unicode 12.1.0, using
903 generator scripts contributed by Mike FABIAN (Red Hat).
905 * The dynamic linker accepts the --preload argument to preload shared
906 objects, in addition to the LD_PRELOAD environment variable.
908 * The twalk_r function has been added. It is similar to the existing
909 twalk function, but it passes an additional caller-supplied argument
910 to the callback function.
912 * On Linux, the getdents64, gettid, and tgkill functions have been added.
914 * Minguo (Republic of China) calendar support has been added as an
915 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
918 * The entry for the new Japanese era has been added for ja_JP locale.
920 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
921 pvalloc, memalign, and posix_memalign fail now with total object size
922 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
923 pointer subtraction within the allocated object, where results might
924 overflow the ptrdiff_t type.
926 * The dynamic linker no longer refuses to load objects which reference
927 versioned symbols whose implementation has moved to a different soname
928 since the object has been linked. The old error message, symbol
929 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
930 link time reference, is gone.
932 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
933 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
934 functions. These behave similarly to their "timed" equivalents, but also
935 accept a clockid_t parameter to determine which clock their timeout should
936 be measured against. All functions allow waiting against CLOCK_MONOTONIC
937 and CLOCK_REALTIME. The decision of which clock to be used is made at the
938 time of the wait (unlike with pthread_condattr_setclock, which requires
939 the clock choice at initialization time).
941 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
942 work, new resolvers can use a second argument which can be extended in
943 the future, currently it contains the AT_HWCAP2 value.
945 Deprecated and removed features, and other changes affecting compatibility:
947 * The copy_file_range function fails with ENOSYS if the kernel does not
948 support the system call of the same name. Previously, user space
949 emulation was performed, but its behavior did not match the kernel
950 behavior, which was deemed too confusing. Applications which use the
951 copy_file_range function can no longer rely on glibc to provide a fallback
952 on kernels that do not support the copy_file_range system call, and if
953 this function returns ENOSYS, they will need to use their own fallback.
954 Support for copy_file_range for most architectures was added in version
955 4.5 of the mainline Linux kernel.
957 * The functions clock_gettime, clock_getres, clock_settime,
958 clock_getcpuclockid, clock_nanosleep were removed from the librt library
959 for new applications (on architectures which had them). Instead, the
960 definitions in libc will be used automatically, which have been available
963 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
964 and <sys/stropts.h> have been removed.
966 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
967 resolver flag (deprecated in glibc 2.25) have been removed.
969 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
970 resolver have been removed from <resolv.h>.
972 * With --enable-bind-now, installed programs are now linked with the
975 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
976 configurations) has been removed, following the deprecation of this
977 subarchitecture in version 8 of GCC, and its removal in version 9.
979 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
980 header have been removed.
982 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
983 deprecated and will be removed from a future version of glibc.
984 Application should directly access /proc instead. For obtaining random
985 bits, the getentropy function can be used.
987 Changes to build and runtime requirements:
989 * GCC 6.2 or later is required to build the GNU C Library.
991 Older GCC versions and non-GNU compilers are still supported when
992 compiling programs that use the GNU C Library.
994 Security related changes:
996 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
997 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
998 has undefined behavior. On x32, the size_t argument may be passed
999 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1000 32 bits. When it happened with the sign bit of RDX register set,
1001 memcmp gave the wrong result since it treated the size argument as
1002 zero. Reported by H.J. Lu.
1004 CVE-2019-9169: Attempted case-insensitive regular-expression match
1005 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1006 over-read. Reported by Hongxu Chen.
1008 The following bugs are resolved with this release:
1010 [2872] locale: Transliteration Cyrillic -> ASCII fails
1011 [6399] libc: gettid() should have a wrapper
1012 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1013 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1014 [17396] localedata: globbing for locale by [[.collating-element.]]
1015 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1016 [18465] malloc: memusagestat is built using system C library
1017 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1018 invalid input drops valid char
1019 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1020 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1021 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1022 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1023 [23352] malloc: __malloc_check_init still defined in public header
1025 [23403] nptl: Wrong alignment of TLS variables
1026 [23501] libc: nftw() doesn't return dangling symlink's inode
1027 [23733] malloc: Check the count before calling tcache_get()
1028 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1030 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1031 [23844] nptl: pthread_rwlock_trywrlock results in hang
1032 [23983] argparse: Missing compat versions of argp_failure and argp_error
1033 for long double = double
1034 [23984] libc: Missing compat versions of err.h and error.h functions for
1035 long double = double
1036 [23996] localedata: Dutch salutations
1037 [24040] libc: riscv64: unterminated call chain in __thread_start
1038 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1040 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1041 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1043 [24114] regex: regexec buffer read overrun in "grep -i
1044 '\(\(\)*.\)*\(\)\(\)\1'"
1045 [24122] libc: Segfaults if 0 returned from la_version
1046 [24153] stdio: Some input functions do not react to stdin assignment
1047 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1048 RDX is set) (CVE-2019-7309)
1049 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1050 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1051 not the default "nor"
1052 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1053 false positives, change to modern flexible array
1054 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1055 instructions while maintaining the robust mutex list due to missing
1057 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1058 unnecessary librt dependencies
1059 [24200] localedata: Revert first_weekday removal in en_IE locale
1060 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1061 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1062 [24216] malloc: Check for large bin list corruption when inserting
1064 [24228] stdio: old x86 applications that use legacy libio crash on exit
1065 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1067 [24293] localedata: Missing Minguo calendar support for TW locales
1068 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1069 tt_RU (Tatar) locale
1070 [24307] localedata: Update locale data to Unicode 12.0.0
1071 [24323] dynamic-link: dlopen should not be able open PIE objects
1072 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1073 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1074 tt_RU (Tatar) locale
1075 [24370] localedata: Add lang_name for tt_RU locale
1076 [24372] locale: Binary locale files are not architecture independent
1077 [24394] time: strptime %Ey mis-parses final year of era
1078 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1080 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1082 [24531] malloc: Malloc tunables give tcache assertion failures
1083 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1085 [24535] localedata: Update locale data to Unicode 12.1.0
1086 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1087 kernels and break testing
1088 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1089 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1090 [-Werror=format-overflow=]
1091 [24570] libc: alpha: compat msgctl uses __IPC_64
1092 [24584] locale: Data race in __wcsmbs_clone_conv
1093 [24588] stdio: Remove codecvt vtables from libio
1094 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1096 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1097 [24632] stdio: Old binaries which use freopen with default stdio handles
1099 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1101 [24652] localedata: szl_PL spelling correction
1102 [24695] nss: nss_db: calling getpwent after endpwent crashes
1103 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1104 in /etc/nsswitch.conf
1105 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1106 [24740] libc: getdents64 type confusion
1107 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1108 always implemented in the same library
1109 [24744] libc: Remove copy_file_range emulation
1110 [24757] malloc: memusagestat is linked against system libpthread
1111 [24794] libc: Partial test suite run builds corrupt test-in-container
1119 * The getcpu wrapper function has been added, which returns the currently
1120 used CPU and NUMA node. This function is Linux-specific.
1122 * A new convenience target has been added for distribution maintainers
1123 to build and install all locales as directories with files. The new
1124 target is run by issuing the following command in your build tree:
1125 'make localedata/install-locale-files', with an optional DESTDIR
1126 to set the install root if you wish to install into a non-default
1127 configured location.
1129 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1131 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1132 for _GNU_SOURCE, to match BSD environments.
1134 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1135 indicates that it will abort the transaction prior to entering the kernel
1136 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1137 suspended, and this caused some undefined side-effects issues by aborting
1138 transactions manually. Glibc avoided it by abort transactions manually on
1139 each syscall, but it lead to performance issues on newer kernels where the
1140 HTM state is saved and restore lazily (the state being saved even when the
1141 process actually does not use HTM).
1143 * The functions posix_spawn_file_actions_addchdir_np and
1144 posix_spawn_file_actions_addfchdir_np have been added, enabling
1145 posix_spawn and posix_spawnp to run the new process in a different
1146 directory. These functions are GNU extensions. The function
1147 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1150 * The popen and system do not run atfork handlers anymore (BZ#17490).
1151 Although it is a possible POSIX violation, the POSIX rationale in
1152 pthread_atfork documentation regarding atfork handlers is to handle
1153 inconsistent mutex state after a fork call in a multi-threaded process.
1154 In both popen and system there is no direct access to user-defined mutexes.
1156 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1157 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1159 - C-SKY ABIV2 soft-float little-endian
1160 - C-SKY ABIV2 hard-float little-endian
1162 * strftime's default formatting of a locale's alternative year (%Ey)
1163 has been changed to zero-pad the year to a minimum of two digits,
1164 like "%y". This improves the display of Japanese era years during
1165 the first nine years of a new era, and is expected to be harmless
1166 for all other locales (only Japanese locales regularly have
1167 alternative year numbers less than 10). Zero-padding can be
1168 overridden with the '_' or '-' flags (which are GNU extensions).
1170 * As a GNU extension, the '_' and '-' flags can now be applied to
1171 "%EY" to control how the year number is formatted; they have the
1172 same effect that they would on "%Ey".
1174 Deprecated and removed features, and other changes affecting compatibility:
1176 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1177 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1179 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1180 in <sys/procfs.h>, has been corrected to match the type actually used by
1181 the Linux kernel. This affects the size and layout of that structure on
1182 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1184 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1185 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1186 defined in <sys/procfs.h>, has been corrected to match the type actually
1187 used by the Linux kernel. This affects the size and layout of those
1190 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1191 meant to scan a string and allocate space for it with malloc, is now
1192 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1193 defined. This extension conflicts with C99's use of '%a' to scan a
1194 hexadecimal floating-point number, which is now available to programs
1195 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1197 POSIX.1-2008 includes the feature of allocating a buffer for string input
1198 with malloc, using the modifier letter 'm' instead. Programs using
1199 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1200 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1201 C99 '%a' no longer need to avoid _GNU_SOURCE.
1203 GCC's -Wformat warnings can detect most uses of this extension, as long
1204 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1205 __attribute__ ((format (scanf, ...))).
1207 Changes to build and runtime requirements:
1209 * Python 3.4 or later is required to build the GNU C Library.
1211 * On most architectures, GCC 5 or later is required to build the GNU C
1212 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1214 Older GCC versions and non-GNU compilers are still supported when
1215 compiling programs that use the GNU C Library.
1217 Security related changes:
1219 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1220 denial of service due to resource exhaustion when processing getaddrinfo
1221 calls with crafted host names. Reported by Guido Vranken.
1223 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1224 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1225 happened, accessing the 32-bit size_t value as the full 64-bit register
1226 in the assembly string/memory functions would cause a buffer overflow.
1227 Reported by H.J. Lu.
1229 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1230 addresses with arbitrary trailing characters, potentially leading to data
1231 or command injection issues in applications.
1233 The following bugs are resolved with this release:
1235 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1236 [10496] localedata: 12h time representation in multiple locales faulty
1237 [10797] localedata: it_IT locale numeric does not have a separator for
1239 [11319] libc: dprintf doesn't handle errors properly
1240 [16346] time: mktime: potentially unsafe use of localtime_offset
1241 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1243 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1244 posix_spawn_file_actions_addfchdir_np
1245 [17426] localedata: Indian locales: set the correct date format
1246 [17490] stdio: popen should not invoke atfork handlers
1247 [17783] libc: TIOCSER_TEMT conditions inconsistent
1248 [18040] regex: use-after-free in regexec/get_subexp
1249 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1250 [20018] network: getaddrinfo should reject IP addresses with trailing
1251 characters (CVE-2016-10739)
1252 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1253 [20271] libc: Missing "\n" in __libc_fatal calls
1254 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1255 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1256 pointer argument is non-NULL
1257 [21037] stdio: open_memstream and freopen
1258 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1259 [21716] time: Crash in glibc's mktime in low-memory situations
1260 [22834] stdio: Subprocess forked by popen may crash in Linux when
1261 multithreads call popen
1262 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1263 and pthread_create fails.
1264 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1265 [23125] libc: riscv64: endless loop when throwing an exception from a
1267 [23275] nptl: Race in pthread_mutex_lock while promoting to
1268 PTHREAD_MUTEX_ELISION_NP.
1269 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1271 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1273 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1275 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1276 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1278 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1279 [23521] nss: get_next_alias nss_files file stream leak
1280 [23538] nptl: Hang in pthread_cond_broadcast
1281 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1282 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1283 [23579] libc: Errors misreported in preadv2
1284 [23597] build: support/test-container.c doesn't work with different
1286 [23603] time: mktime signed integer overflow on large timestamps
1287 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1288 [23614] libc: powerpc: missing CFI register information in __mpn_*
1290 [23637] string: Generic strstr/strcasestr fails with huge needles
1291 [23640] libc: no way to easily clear FD_CLOEXEC in
1292 posix_spawn_file_actions_adddup2()
1293 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1295 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1297 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1298 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1299 bits/types/struct_rusage.h
1300 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1302 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1304 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1305 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1306 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1308 [23724] localedata: Albanian date formats are incorrect
1309 [23735] math: libnldbl_nonshared.a references internal libm symbols
1310 [23740] localedata: kl_GL: Month names and date formats need update
1311 [23744] regex: regex refactorings to remove BE, avoid duplication
1312 [23745] time: mktime fix for Gnulib + coreutils
1313 [23758] time: Improve the width of alternate representation for year in
1315 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1316 [23789] time: mktime does not set errno on failure
1317 [23791] localedata: Wrong monetary format for ca_ES locale
1318 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1319 [23794] locale: c16rtomb does not handle surrogate pairs
1320 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1321 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1322 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1323 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1324 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1325 [23862] libc: [sh] missing kernel-features.h undefines
1326 [23864] libc: [riscv] missing kernel-features.h undefines
1327 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1328 [23907] malloc: Incorrect double-free malloc tcache check disregards
1330 [23913] libc: off-by-one in function maybe_script_execute in
1331 sysdeps/posix/spawni.c
1332 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1333 [23923] locale: Add --no-hard-links option to localedef
1334 [23927] network: Linux if_nametoindex() does not close descriptor
1336 [23961] math: powf can overflow to inf without setting errno in non-
1337 nearest rounding mode
1338 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1339 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1340 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1341 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1342 [24011] localedata: Fixed small type in comment for locale bs_BA
1343 [24018] libc: gettext() may return NULL
1344 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1345 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1346 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1348 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1349 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1351 [24046] localedata: en_US locale doesn't define date_fmt
1352 [24063] manual: @var{errno} should be @code{errno}
1353 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1354 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1356 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1358 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1360 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1362 [24112] network: Do not send DNS queries for non-host names (where all
1363 answers will be rejected)
1364 [24130] libc: alpha __remqu corrupts $f3 register
1371 * The localization data for ISO 14651 is updated to match the 2016
1372 Edition 4 release of the standard, this matches data provided by
1373 Unicode 9.0.0. This update introduces significant improvements to the
1374 collation of Unicode characters. This release deviates slightly from
1375 the standard in that the collation element ordering for lowercase and
1376 uppercase LATIN script characters is adjusted to ensure that regular
1377 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1378 is not matched by [a-z]. With the update many locales have been
1379 updated to take advantage of the new collation information. The new
1380 collation information has increased the size of the compiled locale
1381 archive or binary locales.
1383 * The GNU C Library can now be compiled with support for Intel CET, AKA
1384 Intel Control-flow Enforcement Technology. When the library is built
1385 with --enable-cet, the resulting glibc is protected with indirect
1386 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1387 compatible with all existing executables and shared libraries. This
1388 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1389 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1390 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1391 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1392 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1393 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1396 * The GNU C Library now has correct support for ABSOLUTE symbols
1397 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1398 relocated incorrectly or in some cases discarded. The GNU linker can
1399 make use of the newer semantics, but it must communicate it to the
1400 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1401 field) to indicate such support is required.
1403 * Unicode 11.0.0 Support: Character encoding, character type info, and
1404 transliteration tables are all updated to Unicode 11.0.0, using
1405 generator scripts contributed by Mike FABIAN (Red Hat).
1407 * <math.h> functions that round their results to a narrower type are added
1408 from TS 18661-1:2014 and TS 18661-3:2015:
1410 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1411 fMxaddfNx functions.
1413 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1414 fMxsubfNx functions.
1416 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1417 fMxmulfNx functions.
1419 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1420 fMxdivfNx functions.
1422 * Two grammatical forms of month names are now supported for the following
1423 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1424 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1425 support two grammatical forms in abbreviated month names: Catalan, Greek,
1428 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1429 include the support for two grammatical forms of month names.
1431 * Building and running on GNU/Hurd systems now works without out-of-tree
1434 * The renameat2 function has been added, a variant of the renameat function
1435 which has a flags argument. If the flags are zero, the renameat2 function
1436 acts like renameat. If the flag is not zero and there is no kernel
1437 support for renameat2, the function will fail with an errno value of
1438 EINVAL. This is different from the existing gnulib function renameatu,
1439 which performs a plain rename operation in case of a RENAME_NOREPLACE
1440 flags and a non-existing destination (and therefore has a race condition
1441 that can clobber the destination inadvertently).
1443 * The statx function has been added, a variant of the fstatat64
1444 function with an additional flags argument. If there is no direct
1445 kernel support for statx, glibc provides basic stat support based on
1446 the fstatat64 function.
1448 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1449 library if installed. libidn2 version 2.0.5 or later is recommended. If
1450 libidn2 is not available, internationalized domain names are not encoded
1451 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1452 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1453 with an encoding error.) Flags which used to change the IDN encoding and
1454 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1455 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1456 deprecated. They no longer have any effect.
1458 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1459 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1460 range of ELF gABI expressions including such constructs as
1461 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1462 have been further restricted, and where in the past a dynamic string
1463 token sequence may have been interpreted as a literal string it will
1464 now cause a load failure. These load failures were always considered
1465 unspecified behaviour from the perspective of the dynamic loader, and
1466 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1467 results in a load failure now.
1469 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1470 implementation includes all the standard functions provided by
1473 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1474 thrd_detach, thrd_exit, and thrd_join for thread management.
1476 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1477 mtx_destroy for mutual exclusion.
1479 - call_once for function call synchronization.
1481 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1482 cnd_wait for conditional variables.
1484 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1486 Application developers must link against libpthread to use ISO C threads.
1488 Deprecated and removed features, and other changes affecting compatibility:
1490 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1491 installed. Software that was using either header should be updated to
1492 use standard <stdio.h> interfaces instead.
1494 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1495 This was never required by the C standard, and the macros just expanded
1496 to call alternative names for the same functions. If you hoped getc and
1497 putc would provide performance improvements over fgetc and fputc, instead
1498 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1499 necessary, flockfile and funlockfile.
1501 * All stdio functions now treat end-of-file as a sticky condition. If you
1502 read from a file until EOF, and then the file is enlarged by another
1503 process, you must call clearerr or another function with the same effect
1504 (e.g. fseek, rewind) before you can read the additional data. This
1505 corrects a longstanding C99 conformance bug. It is most likely to affect
1506 programs that use stdio to read interactive input from a terminal.
1509 * The macros 'major', 'minor', and 'makedev' are now only available from
1510 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1511 headers that happen to include <sys/types.h>. These macros are rarely
1512 used, not part of POSIX nor XSI, and their names frequently collide with
1513 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1514 further explanation.
1516 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1517 these macros should first include <sys/types.h>, and then include
1518 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1520 * The tilegx*-*-linux-gnu configurations are no longer supported.
1522 * The obsolete function ustat is no longer available to newly linked
1523 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1524 function has been deprecated in favor of fstatfs and statfs.
1526 * The obsolete function nfsservctl is no longer available to newly linked
1527 binaries. This function was specific to systems using the Linux kernel
1528 and could not usefully be used with the GNU C Library on systems with
1529 version 3.1 or later of the Linux kernel.
1531 * The obsolete function name llseek is no longer available to newly linked
1532 binaries. This function was specific to systems using the Linux kernel
1533 and was not declared in a header. Programs should use the lseek64 name
1534 for this function instead.
1536 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1537 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1538 previously selected by them is now always enabled.
1540 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1541 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1542 restriction (rejecting '_' in host names, among other things) has been
1543 removed, for increased compatibility with non-IDN name resolution.
1545 * The fcntl function now have a Long File Support variant named fcntl64. It
1546 is added to fix some Linux Open File Description (OFD) locks usage on non
1547 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1548 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1549 locks act as a cancellation entrypoint.
1551 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1552 ecb_crypt, and des_setparity are no longer available to newly linked
1553 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1554 longer installed. These functions encrypted and decrypted data with the
1555 DES block cipher, which is no longer considered secure. Software that
1556 still uses these functions should switch to a modern cryptography library,
1559 * Reflecting the removal of the encrypt and setkey functions above, the
1560 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1561 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1564 * The obsolete function fcrypt is no longer available to newly linked
1565 binaries. It was just another name for the standard function crypt,
1566 and it has not appeared in any header file in many years.
1568 * We have tentative plans to hand off maintenance of the passphrase-hashing
1569 library, libcrypt, to a separate development project that will, we hope,
1570 keep up better with new passphrase-hashing algorithms. We will continue
1571 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1572 'crypt_r' should not need to change at all; however, distributions will
1573 need to install <crypt.h> and libcrypt from a separate project.
1575 In this release, if the configure option --disable-crypt is used, glibc
1576 will not install <crypt.h> or libcrypt, making room for the separate
1577 project's versions of these files. The plan is to make this the default
1578 behavior in a future release.
1580 Changes to build and runtime requirements:
1582 GNU make 4.0 or later is now required to build glibc.
1584 Security related changes:
1586 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1587 been fixed by removing the glibc-internal IDNA implementation and using
1588 the system-provided libidn2 library instead. Originally reported by Hanno
1589 Böck and Christian Weisgerber.
1591 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1592 architecture could corrupt memory. Reported by Max Horn.
1594 CVE-2018-11236: Very long pathname arguments to realpath function could
1595 result in an integer overflow and buffer overflow. Reported by Alexey
1598 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1599 architecture could write beyond the target buffer, resulting in a buffer
1600 overflow. Reported by Andreas Schwab.
1602 The following bugs are resolved with this release:
1604 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1605 [6889] manual: 'PWD' mentioned but not specified
1606 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1607 when __WORDSIZE != 64
1608 [13762] regex: re_search etc. should return -2 on memory exhaustion
1609 [13888] build: /tmp usage during testing
1610 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1611 [14092] nptl: Support C11 threads
1612 [14095] localedata: Review / update collation data from Unicode / ISO
1614 [14508] libc: -Wformat warnings
1615 [14553] libc: Namespace pollution loff_t in sys/types.h
1616 [14890] libc: Make NT_PRFPREG canonical.
1617 [15105] libc: Extra PLT references with -Os
1618 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1620 [16335] manual: Feature test macro documentation incomplete and out of
1622 [16552] libc: Unify umount implementations in terms of umount2
1623 [17082] libc: htons et al.: statement-expressions prevent use on global
1624 scope with -O1 and higher
1625 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1626 [17438] localedata: pt_BR: wrong d_fmt delimiter
1627 [17662] libc: please implement binding for the new renameat2 syscall
1628 [17721] libc: __restrict defined as /* Ignore */ even in c11
1629 [17979] libc: inconsistency between uchar.h and stdint.h
1630 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1631 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1632 horrible machine code)
1633 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1635 [18471] libc: llseek should be a compat symbol
1636 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1638 [18991] nss: nss_files skips large entry in database
1639 [19239] libc: Including stdlib.h ends up with macros major and minor being
1641 [19463] libc: linknamespace failures when compiled with -Os
1642 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1643 [19527] locale: Normalized charset name not recognized by setlocale
1644 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1645 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1647 [19728] network: out of bounds stack read in libidn function
1648 idna_to_ascii_4i (CVE-2016-6261)
1649 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1650 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1651 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1653 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1654 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1655 [20419] dynamic-link: files with large allocated notes crash in
1657 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1658 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1659 [20980] manual: CFLAGS environment variable replaces vital options
1660 [21163] regex: Assertion failure in pop_fail_stack when executing a
1661 malformed regexp (CVE-2015-8985)
1662 [21234] manual: use of CFLAGS makes glibc detect no optimization
1663 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1664 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1665 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1666 [21508] locale: intl/tst-gettext failure with latest msgfmt
1667 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1668 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1669 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1671 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1673 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1674 [22247] network: Integer overflow in the decode_digit function in
1675 puny_decode.c in libidn (CVE-2017-14062)
1676 [22342] nscd: NSCD not properly caching netgroup
1677 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1678 [22550] localedata: es_ES locale (and other es_* locales): collation
1679 should treat ñ as a primary different character, sync the collation
1680 for Spanish with CLDR
1681 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1682 by gcc configured with --enable-default-pie
1683 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1684 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1685 crossing 2GB threshold (CVE-2017-18269)
1686 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1688 [22735] time: Misleading typo in time.h source comment regarding
1690 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1691 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1692 `__assert_perror_fail ()' to `__assert_fail_base ()'
1693 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1695 [22786] libc: Stack buffer overflow in realpath() if input size is close
1696 to SSIZE_MAX (CVE-2018-11236)
1697 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1698 through an absolute DT_NEEDED path
1699 [22792] build: tcb-offsets.h dependency dropped
1700 [22797] libc: pkey_get() uses non-reserved name of argument
1701 [22807] libc: PTRACE_* constants missing for powerpc
1702 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1703 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1704 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1705 [22848] localedata: ca_ES: update date definitions from CLDR
1706 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1707 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1708 [22896] localedata: Update locale data for an_ES
1709 [22902] math: float128 test failures with GCC 8
1710 [22918] libc: multiple common of `__nss_shadow_database'
1711 [22919] libc: sparc32: backtrace yields infinite backtrace with
1713 [22926] libc: FTBFS on powerpcspe
1714 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1716 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1717 [22947] libc: FAIL: misc/tst-preadvwritev2
1718 [22963] localedata: cs_CZ: Add alternative month names
1719 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1720 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1721 [22998] dynamic-link: execstack tests are disabled when SELinux is
1723 [23005] network: Crash in __res_context_send after memory allocation
1725 [23007] math: strtod cannot handle -nan
1726 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1727 [23036] regex: regex equivalence class regression
1728 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1729 [23069] libc: sigaction broken on riscv64-linux-gnu
1730 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1731 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1732 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1733 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1734 and libc build with -Os)
1735 [23140] localedata: More languages need two forms of month names
1736 [23145] libc: _init/_fini aren't marked as hidden
1737 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1738 [23171] math: C++ iseqsig for long double converts arguments to double
1739 [23178] nscd: sudo will fail when it is run in concurrent with commands
1740 that changes /etc/passwd
1741 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1743 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1744 [23208] localedata: New locale - Lower Sorbian (dsb)
1745 [23233] regex: Memory leak in build_charclass_op function in file
1747 [23236] stdio: Harden function pointers in _IO_str_fields
1748 [23250] nptl: Offset of __private_ss differs from GCC
1749 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1750 -mtune=generic -mfpmath=sse
1751 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1753 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1754 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1756 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1757 [23277] math: nan function should not have const attribute
1758 [23279] math: scanf and strtod wrong for some hex floating-point
1759 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1761 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1762 [23303] build: undefined reference to symbol
1763 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1764 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1766 [23313] stdio: libio vtables validation and standard file object
1768 [23329] libc: The __libc_freeres infrastructure is not properly run across
1770 [23349] libc: Various glibc headers no longer compatible with
1772 [23351] malloc: Remove unused code related to heap dumps and malloc
1774 [23363] stdio: stdio-common/tst-printf.c has non-free license
1775 [23396] regex: Regex equivalence regression in single-byte locales
1776 [23422] localedata: oc_FR: More updates of locale data
1777 [23442] build: New warning with GCC 8
1778 [23448] libc: Out of bounds access in IBM-1390 converter
1779 [23456] libc: Wrong index_cpu_LZCNT
1780 [23458] build: tst-get-cpu-features-static isn't added to tests
1781 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1783 [23467] dynamic-link: x86/CET: A property note parser bug
1790 * The GNU C Library can now be compiled with support for building static
1791 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1792 executables are like static executables but can be loaded at any address
1793 and provide additional security hardening benefits at the cost of some
1794 memory and performance. When the library is built with --enable-static-pie
1795 the resulting libc.a is usable with GCC 8 and above to create static PIE
1796 executables using the GCC option '-static-pie'. This feature is currently
1797 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1798 aarch64 with binutils 2.30 or later.
1800 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1801 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1804 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1806 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1808 * In order to support faster and safer process termination the malloc API
1809 family of functions will no longer print a failure address and stack
1810 backtrace after detecting heap corruption. The goal is to minimize the
1811 amount of work done after corruption is detected and to avoid potential
1812 security issues in continued process execution. Reducing shutdown time
1813 leads to lower overall process restart latency, so there is benefit both
1814 from a security and performance perspective.
1816 * The abort function terminates the process immediately, without flushing
1817 stdio streams. Previous glibc versions used to flush streams, resulting
1818 in deadlocks and further data corruption. This change also affects
1819 process aborts as the result of assertion failures.
1821 * On platforms where long double has the IEEE binary128 format (aarch64,
1822 alpha, mips64, riscv, s390 and sparc), the math library now implements
1823 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1824 These are the same interfaces added in version 2.26 for some platforms where
1825 this format is supported but is not the format of long double.
1827 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1828 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1829 implements interfaces for that type, as defined by ISO/IEC TS
1830 18661-3:2015. These are corresponding interfaces to those supported for
1833 * The math library now implements interfaces for the _Float32, _Float64 and
1834 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1835 corresponding interfaces to those supported for _Float128.
1837 * glibc now implements the memfd_create and mlock2 functions on Linux.
1839 * Support for memory protection keys was added. The <sys/mman.h> header now
1840 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1843 * The copy_file_range function was added.
1845 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1847 * The ldconfig utility now processes `include' directives using the C/POSIX
1848 collation ordering. Previous glibc versions used locale-specific
1849 ordering, the change might break systems that relied on that.
1851 * Support for two grammatical forms of month names has been added.
1852 In a call to strftime, the "%B" and "%b" format specifiers will now
1853 produce the grammatical form required when the month is used as part
1854 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1855 required when the month is named by itself. For instance, in Greek
1856 and in many Slavic and Baltic languages, "%B" will produce the month
1857 in genitive case, and "%OB" will produce the month in nominative case.
1859 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1860 are all valid and will all accept any known form of month
1861 name---standalone or complete, abbreviated or full. In a call to
1862 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1863 the strings used by "%B" and "%b", respectively. New query
1864 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1865 used by "%OB" and "%Ob", respectively.
1867 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1868 define the strings for %OB and %Ob, respectively; these have the
1869 same syntax as "mon" and "abmon". These arrays are optional; if they
1870 are not provided then they have the same content as "mon" and "abmon",
1873 These features are provided for locales which define "alt_mon" and/or
1874 "ab_alt_mon" in their locale source data. This release includes such
1875 alternative month name data for the following languages: Belarusian,
1876 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1878 This feature is currently a GNU extension, but it is expected to
1879 be added to the next revision of POSIX, and it is also already
1880 available on some BSD-derived operating systems.
1882 This feature will cause existing statically compiled applications
1883 to fail to load locales and fall back to the builtin C/POSIX locales.
1884 See notes below for other changes affecting compatibility.
1886 * Support for the RISC-V ISA running on Linux has been added. This port
1887 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1888 for the following ISA and ABI pairs:
1894 Deprecated and removed features, and other changes affecting compatibility:
1896 * Statically compiled applications attempting to load locales compiled for the
1897 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1898 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1899 support for two grammatical forms of the month names, also extends the locale
1900 data binary format. Static applications needing locale support must be
1901 recompiled to match the runtime and data they are deployed with. In some
1902 distributions there is an upgrade window where dynamically linked applications
1903 may use a new library but the old locale data and also fall back to the
1904 builtin C/POSIX locales; restarting the application process is sufficient to
1907 * Support for statically linked applications which call dlopen is deprecated
1908 and will be removed in a future version of glibc. Applications which call
1909 dlopen need to be linked dynamically instead.
1911 * Support for old programs which use internal stdio data structures and
1912 functions is deprecated. This includes programs which use the C++ streams
1913 provided by libstdc++ in GCC 2.95. Programs which use the internal
1914 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1915 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1916 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1917 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1918 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1919 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1920 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1921 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1922 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1923 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1924 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1925 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1926 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1927 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1928 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1929 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1930 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1931 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1932 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1933 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1934 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1935 future version of glibc. Unlike other symbol removals, these old
1936 applications will not be supported using compatibility symbols.
1938 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1939 defined by <sys/ptrace.h>.
1941 * libm no longer supports SVID error handling (calling a user-provided
1942 matherr function on error) or the _LIB_VERSION variable to control error
1943 handling. (SVID error handling and the _LIB_VERSION variable still work
1944 for binaries linked against older versions of the GNU C Library.) The
1945 libieee.a library is no longer provided. math.h no longer defines struct
1946 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1947 TLOSS, PLOSS and HUGE.
1949 * The libm functions pow10, pow10f and pow10l are no longer supported for
1950 new programs. Programs should use the standard names exp10, exp10f and
1951 exp10l for these functions instead.
1953 * The mcontext_t type is no longer the same as struct sigcontext. On
1954 platforms where it was previously the same, this changes the C++ name
1955 mangling for interfaces involving this type.
1957 * The add-ons mechanism for building additional packages at the same time as
1958 glibc has been removed. The --enable-add-ons configure option is now
1961 * The --without-fp configure option is now ignored. Whether hardware
1962 floating-point instructions are used is now configured based on whether
1963 the compiler used at configure time (without any options implied by a
1964 --with-cpu= configure option) uses such instructions.
1966 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1967 the specified string can be parsed as a domain name.
1969 * In the malloc_info output, the <heap> element may contain another <aspace>
1970 element, "subheaps", which contains the number of sub-heaps.
1972 * The libresolv function p_secstodate is no longer supported for new
1975 * The tilepro-*-linux-gnu configuration is no longer supported.
1977 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1978 and will be removed in a future release. Software that is still using
1979 either header should be updated to use standard <stdio.h> interfaces
1982 libio.h was originally the header for a set of supported GNU extensions,
1983 but they have not been maintained as such in many years, they are now
1984 standing in the way of improvements to stdio, and we don't think there are
1985 any remaining external users. _G_config.h was never intended for public
1986 use, but predates the bits convention.
1988 Changes to build and runtime requirements:
1990 * bison version 2.7 or later is required to generate code in the 'intl'
1993 Security related changes:
1995 CVE-2009-5064: The ldd script would sometimes run the program under
1996 examination directly, without preventing code execution through the
1997 dynamic linker. (The glibc project disputes that this is a security
1998 vulnerability; only trusted binaries must be examined using the ldd
2001 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2002 suffered from a one-byte overflow during ~ operator processing (either
2003 on the stack or the heap, depending on the length of the user name).
2004 Reported by Tim Rühsen.
2006 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2007 would sometimes fail to free memory allocated during ~ operator
2008 processing, leading to a memory leak and, potentially, to a denial
2011 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2012 without GLOB_NOESCAPE, could write past the end of a buffer while
2013 unescaping user names. Reported by Tim Rühsen.
2015 CVE-2017-17426: The malloc function, when called with an object size near
2016 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2017 instead of NULL. This was a regression introduced with the new malloc
2018 thread cache in glibc 2.26. Reported by Iain Buclaw.
2020 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2021 to the allocation of too much memory. (This is not a security bug per se,
2022 it is mentioned here only because of the CVE assignment.) Reported by
2025 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2026 of the number of search path components. (This is not a security
2027 vulnerability per se because no trust boundary is crossed if the fix for
2028 CVE-2017-1000366 has been applied, but it is mentioned here only because
2029 of the CVE assignment.) Reported by Qualys.
2031 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2032 for AT_SECURE or SUID binaries could be used to load libraries from the
2035 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2036 succeeds without returning an absolute path due to unexpected behaviour
2037 of the Linux kernel getcwd syscall. Reported by halfdog.
2039 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2040 an object size near the value of SIZE_MAX, would return a pointer to a
2041 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2043 CVE-2018-6551: The malloc function, when called with an object size near
2044 the value of SIZE_MAX, would return a pointer to a buffer which is too
2045 small, instead of NULL.
2047 The following bugs are resolved with this release:
2049 [866] glob: glob should match dangling symlinks
2050 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2051 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2053 [5997] math: Very slow execution of sinf function
2054 [10580] localedata: hr_HR: updated locale
2055 [10871] locale: 'mon' array should contain both nominative and genitive
2057 [12349] localedata: eu_ES: incorrect thousands separator
2058 [13605] localedata: shn_MM: new Shan locale
2059 [13805] localedata: ru_RU: currency should use ',' as radix point
2060 [13953] localedata: km_KH: locale update
2061 [13994] localedata: mjw_IN: new locale
2062 [14121] build: make writes .mo files in po directory
2063 [14333] libc: Fix the race between atexit() and exit()
2064 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2065 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2067 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2068 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2069 width Latin characters
2070 [15332] localedata: es_CU: locale update
2071 [15436] stdio: Don't close or flush stdio streams on abort
2072 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2074 [16148] localedata: ca_ES: incorrect thousands separator
2075 [16750] dynamic-link: ldd should not try to execute the binaries
2077 [16777] localedata: pl_PL: incorrect thousands separator in locale
2078 [16905] localedata: hanzi: new collation
2079 [17563] localedata: cmn_TW: add hanzi collation
2080 [17750] localedata: wrong collation order of diacritics in most locales
2081 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2083 [17956] build: Build fails on missing definitions from header file
2084 nss/nss.h when Mozilla NSS is used for cryptography
2085 [18203] libc: realpath() does not handle unreachable paths correctly
2086 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2087 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2088 [18822] libc: Internal functions are called via PLT
2089 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2090 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2091 [19574] libc: glibc should support building static PIE binaries
2092 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2094 [19971] glob: glob: Do not skip entries with zero d_ino values
2095 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2096 [20008] localedata: km_KH: convert to translit_neutral
2097 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2098 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2099 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2100 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2101 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2103 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2104 they're set, wrong errors returned by gaih_inet when lookup functions
2106 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2107 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2109 [20952] localedata: yuw_PG: new locale
2110 [21084] localedata: charmaps/IBM858: new codepage
2111 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2112 [21242] libc: assert gives pedantic warning in old gcc versions
2113 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2114 __regcall calling convention
2115 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2116 [21326] libc: C99 functions are not declared for C++11 and later if
2117 _GNU_SOURCE is not predefined by g++
2118 [21457] libc: sys/ucontext.h namespace
2119 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2120 [21660] math: GCC fails to compile a formula with tgmath.h
2121 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2122 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2123 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2124 [21684] math: tgmath.h handling of complex integers
2125 [21685] math: tgmath.h handling of bit-fields
2126 [21686] math: tgmath.h handling of __int128
2127 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2129 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2131 [21750] localedata: column width of characters incompatible with classical
2133 [21754] malloc: malloc: Perform as little work as possible after heap
2134 consistency check failures
2135 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2136 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2137 [21791] string: Unused XXX_chk_XXX functions in libc.a
2138 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2140 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2142 [21845] localedata: Added new Locale bho_NP
2143 [21853] localedata: Fix abday Which looks same as day in zh_SG
2144 [21854] localedata: Added New Locale en_SC
2145 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2146 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2147 _dl_runtime_resolve_avx_slow
2148 [21885] network: getaddrinfo: gethosts does not release resolver context
2149 on memory allocation failure
2150 [21899] libc: XPG4.2 sigaction namespace
2151 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2153 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2155 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2156 errno value, causing getaddrinfo to fail
2157 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2158 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2159 instead of EAI_NODATA
2160 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2161 constant PTRACE_SEIZE_DEVEL
2162 [21930] math: C-only gcc builtins used in <math.h> isinf
2163 [21932] network: Unpaired __resolv_context_get in generic get*_r
2165 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2166 [21944] libc: sigval namespace
2167 [21951] localedata: Update hanzi collation by stroke
2168 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2169 sysdeps/x86_64/fpu/e_expf.S
2170 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2171 allocation in syscall loops)
2172 [21959] localedata: Fix Country name for xh_ZA
2173 [21960] localedata: Fix abmon for bem_ZM
2174 [21966] math: AVX2 mathvec functions use FMA without checking
2175 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2176 [21971] localedata: Added New Locale for mfe_MU
2177 [21972] libc: assert macro requires operator== (int) for its argument type
2178 [21973] math: [sparc] libm missing sqrtl compat symbol
2179 [21974] libc: Remove __bb_init_func and __bb_exit_func
2180 [21982] string: stratcliff.c: error: assuming signed overflow does not
2182 [21986] stdio: __guess_grouping is called incorrectly
2183 [21987] math: [sparc32] wrong bits/long-double.h installed
2184 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2186 [22022] localedata: Missing country_name for mni_IN
2187 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2189 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2191 [22026] locale: iconv_open: heap overflow on gconv_init failure
2192 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2193 [22035] math: [m68k] bits/math-inline.h macro namespace
2194 [22038] localedata: Fix abbreviated weeks and months for Somali
2195 [22044] localedata: Remove redundant data for Limburgish Language
2196 [22050] malloc: Linking with -lmcheck does not hook
2197 __malloc_initialize_hook correctly
2198 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2199 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2200 [22070] localedata: charmaps/UTF-8: wcwidth for
2201 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2202 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2203 Jungseong and Jongseong) should be 0
2204 [22078] nss: nss_files performance issue in multi mode
2205 [22082] math: bits/math-finite.h exp10 condition
2206 [22086] libc: pcprofiledump incorrect cross-endian condition
2207 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2208 [22095] network: Name server address allocation memory leak in resolv.conf
2210 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2212 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2213 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2215 [22111] malloc: malloc: per thread cache is not returned when thread exits
2216 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2217 [22134] libc: [linux] implement fexecve with execveat
2218 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2220 [22145] libc: ttyname() gives up too early in the face of namespaces
2221 [22146] math: C++ build issue with float128 on x86_64
2222 [22153] nptl: nptl: save error code before process termination
2223 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2224 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2225 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2226 [22165] libc: [hppa] Text relocations in libc.so
2227 [22180] libc: destructor registered via __cxa_atexit is called twice
2228 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2229 symlinks") cause "make" segfaults
2230 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2232 [22207] libc: FAIL: stdlib/test-atexit-race
2233 [22225] math: nearbyint arithmetic moved before feholdexcept
2234 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2235 [22235] math: iscanonical in C++ and float128
2236 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2237 the svid compat wrapper
2238 [22244] math: ynf and yn are wrong without the svid compat wrapper
2239 [22273] libc: Improper assert in Linux posix_spawn implementation
2240 [22284] libc: -pg -pie doesn't work
2241 [22292] locale: localedef exits with error 4 when it should be error 1
2242 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2243 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2245 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2246 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2248 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2249 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2250 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2251 [22322] libc: [mips64] wrong bits/long-double.h installed
2252 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2253 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2255 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2256 [22343] malloc: Integer overflow in posix_memalign
2257 [22347] libc: getrandom() returns the number of bytes that were copied to
2258 the buffer even though the comments say "Return 0 on success and -1 on
2260 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2261 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2263 [22370] dynamic-link: Incorrect note padding check
2264 [22375] libc: malloc returns pointer from tcache_get when should return
2265 NULL (CVE-2017-17426)
2266 [22377] math: iseqsig, float128 and C++
2267 [22382] localedata: Error in tpi_PG locale
2268 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2269 inside the ASCII printable range
2270 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2272 [22403] localedata: Slash needs escaping in some locales
2273 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2274 [22409] network: res_hnok does not accept some host names used on the
2276 [22412] network: res_dnok, res_hnok should perform syntax checks
2277 [22413] network: ns_name_pton ignores syntactically invalid trailing
2279 [22415] stdio: setvbuf can lead to invalid free/segfault
2280 [22432] build: Non-deterministic build
2281 [22439] malloc: malloc_info should compute summary statistics for all sub-
2283 [22442] network: if_nametoindex could report index for the wrong
2284 networking interface
2285 [22446] build: aliasing violation calling readlink in handle_request
2286 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2287 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2288 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2289 __nscd_hash/__nss_hash
2290 [22463] network: p_secstodate overflow handling
2291 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2292 [22478] libc: sigwait can fail with EINTR
2293 [22505] libc: ldconfig processes include directive in locale-specific
2295 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2296 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2297 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2298 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2299 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2300 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2301 same as for Croatian
2302 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2303 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2304 [22577] libc: missing newline after "cannot allocate TLS data structures
2306 [22588] manual: manual/conf.texi: missing underscore in front of
2308 [22593] math: nextafter and nexttoward are declared with const attribute
2309 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2310 [22603] string: ia64 memchr overflows internal pointer check
2311 [22605] libc: SH clone does not set the exit code correctly
2312 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2314 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2315 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2316 modified in case of success
2317 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2318 [22615] manual: manual: ambiguous wording about errno value in case of
2320 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2322 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2323 binaries or if /proc is not mounted (CVE-2017-16997)
2324 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2325 [22630] build: $(no-pie-ldflag) is no longer effective
2326 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2327 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2328 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2329 [22637] nptl: guard size is subtracted from thread stack size instead of
2331 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2332 [22657] localedata: hu_HU: Avoid double space in date
2333 [22660] math: fmax, fmin sNaN handling on alpha
2334 [22664] libc: New warning of GCC8
2335 [22665] math: alpha: ceil and floor raise inexact exceptions
2336 [22666] math: alpha: trunc raise inexact exceptions
2337 [22667] libc: makecontext lacks stack alignment on i386
2338 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2339 [22679] libc: getcwd(3) can succeed without returning an absolute path
2341 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2342 elision and tunables
2343 [22687] math: [powerpc-nofpu] complex long double functions spurious
2345 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2346 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2347 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2349 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2350 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2352 [22701] nis: Incomplete removal of libnsl
2353 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2354 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2355 [22715] dynamic-link: FAIL: elf/tst-audit10
2356 [22719] libc: Backtrace tests fail on hppa
2357 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2358 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2359 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2360 before the first call to crypt_r () in crypt/badsalttest.c
2367 * A per-thread cache has been added to malloc. Access to the cache requires
2368 no locks and therefore significantly accelerates the fast path to allocate
2369 and free small amounts of memory. Refilling an empty cache requires locking
2370 the underlying arena. Performance measurements show significant gains in a
2371 wide variety of user workloads. Workloads were captured using a special
2372 instrumented malloc and analyzed with a malloc simulator. Contributed by
2373 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2375 * Unicode 10.0.0 Support: Character encoding, character type info, and
2376 transliteration tables are all updated to Unicode 10.0.0, using
2377 generator scripts contributed by Mike FABIAN (Red Hat).
2378 These updates cause user visible changes, especially the changes in
2379 wcwidth for many emoji characters cause problems when emoji sequences
2380 are rendered with pango, see for example:
2381 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2383 * Collation of Hungarian has been overhauled and is now consistent with "The
2384 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2387 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2389 - The GNU C Library will now detect when /etc/resolv.conf has been
2390 modified and reload the changed configuration. The new resolver option
2391 “no-reload” (RES_NORELOAD) disables this behavior.
2393 - The GNU C Library now supports an arbitrary number of search domains
2394 (configured using the “search” directive in /etc/resolv.conf);
2395 previously, there was a hard limit of six domains. For backward
2396 compatibility, applications that directly modify the ‘_res’ global
2397 object are still limited to six search domains.
2399 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2400 Library will now randomly pick a name server from the configuration as a
2401 starting point. (Previously, the second name server was always used.)
2403 * The tunables feature is now enabled by default. This allows users to tweak
2404 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2406 * New function reallocarray, which resizes an allocated block (like realloc)
2407 to the product of two sizes, with a guaranteed clean failure upon integer
2408 overflow in the multiplication. Originally from OpenBSD, contributed by
2409 Dennis Wölfing and Rüdiger Sonderfeld.
2411 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2412 These are extended versions of preadv and pwritev, respectively, taking an
2413 additional flags argument. The set of supported flags depends on the
2414 running kernel; full support currently requires kernel 4.7 or later.
2416 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2417 create a new session ID for the spawned process. This feature is
2418 scheduled to be added to the next major revision of POSIX; for the time
2419 being, it is available under _GNU_SOURCE.
2421 * errno.h is now safe to use from C-preprocessed assembly language on all
2422 supported operating systems. In this context, it will only define the
2423 Exxxx constants, as preprocessor macros expanding to integer literals.
2425 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2426 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2427 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2428 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2430 To compile programs that use this feature, the compiler must support
2431 128-bit floating point with the type name _Float128 (as defined by TS
2432 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2433 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2434 must be defined to make the new interfaces visible.
2436 The new functions and macros correspond to those present for other
2437 floating-point types (except for a few obsolescent interfaces not
2438 supported for the new type), with F128 or f128 suffixes; for example,
2439 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2440 printf or scanf formats for the new type; the strfromf128 and strtof128
2441 interfaces should be used instead.
2443 Deprecated and removed features, and other changes affecting compatibility:
2445 * The synchronization that pthread_spin_unlock performs has been changed to
2446 now be equivalent to a C11 atomic store with release memory order to the
2447 spin lock's memory location. Previously, several (but not all)
2448 architectures used stronger synchronization (e.g., containing what is
2449 often called a full barrier). This change can improve performance, but
2450 may affect odd fringe uses of spin locks that depend on the previous
2451 behavior (e.g., using spin locks as atomic variables to try to implement
2452 Dekker's mutual exclusion algorithm).
2454 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2457 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2458 will only be built and installed when the GNU C Library is configured with
2459 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2460 as TIRPC or rpcsvc-proto, to be used.
2462 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2463 libnss_compat, are deprecated, and will not be built or installed by
2466 The NIS(+) support library, libnsl, is also deprecated. By default, a
2467 compatibility shared library will be built and installed, but not headers
2468 or development libraries. Only a few NIS-related programs require this
2469 library. (In particular, the GNU C Library has never required programs
2470 that use 'gethostbyname' to be linked with libnsl.)
2472 Replacement implementations based on TIRPC, which additionally support
2473 IPv6, are available from <https://github.com/thkukuk/>. The configure
2474 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2475 name service modules, to be built and installed.
2477 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2478 support is enabled, the configured recursive resolver must support EDNS.
2479 (Responding to EDNS-enabled queries with responses which are not
2480 EDNS-enabled is fine, but FORMERR responses are not.)
2482 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2483 servers have not supported this opcode for a long time.
2485 * The _res_opcodes variable has been removed from libresolv. It had been
2486 exported by accident.
2488 * <string.h> no longer includes inline versions of any string functions,
2489 as this kind of optimization is better done by the compiler. The macros
2490 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2492 * The nonstandard header <xlocale.h> has been removed. Most programs should
2493 use <locale.h> instead. If you have a specific need for the definition of
2494 locale_t with no other declarations, please contact
2495 libc-alpha@sourceware.org and explain.
2497 * The obsolete header <sys/ultrasound.h> has been removed.
2499 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2501 * The obsolete function cfree has been removed. Applications should use
2504 * The stack_t type no longer has the name struct sigaltstack. This changes
2505 the C++ name mangling for interfaces involving this type.
2507 * The ucontext_t type no longer has the name struct ucontext. This changes
2508 the C++ name mangling for interfaces involving this type.
2510 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2511 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2512 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2513 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2514 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2515 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2516 fpregset_t type no longer has the name struct fpu. This changes the C++
2517 name mangling for interfaces involving those types.
2519 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2520 synced with the kernel:
2522 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2523 are not supported on this architecture and have been removed.
2525 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2526 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2527 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2529 Programs that assume the GET/SETREGS ptrace requests are universally
2530 available will now fail to build, instead of malfunctioning at runtime.
2532 Changes to build and runtime requirements:
2534 * Linux kernel 3.2 or later is required at runtime, on all architectures
2535 supported by that kernel. (This is a change from version 2.25 only for
2538 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2540 * On most architectures, GCC 4.9 or later is required to build the GNU C
2541 Library. On powerpc64le, GCC 6.2 or later is required.
2543 Older GCC versions and non-GNU compilers are still supported when
2544 compiling programs that use the GNU C Library. (We do not know exactly
2545 how old, and some GNU extensions to C may be _de facto_ required. If you
2546 are interested in helping us make this statement less vague, please
2547 contact libc-alpha@sourceware.org.)
2549 Security related changes:
2551 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2552 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2554 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2555 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2557 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2558 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2561 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2562 fixed (CVE-2017-12133).
2564 The following bugs are resolved with this release:
2566 [984] network: Respond to changed resolv.conf in gethostbyname
2567 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2568 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2570 [12189] libc: __stack_chk_fail should not attempt a backtrace
2572 [14096] time: Race condition on timezone/tst-timezone.out
2573 [14172] localedata: az_IR: new locale
2574 [14995] build: glibc fails to build if gold is the default linker, even if
2576 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2577 [16637] network: inet_pton function is accepting IPv6 with bad format
2578 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2579 x86 and other generic code
2580 [16875] localedata: ko_KR: fix lang_name
2581 [17225] localedata: ar_SY: localized month names for May and June are
2583 [17297] localedata: da_DK: wrong date_fmt string
2584 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2585 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2586 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2587 [19066] localedata: ar_SA abbreviated day and month names are in English
2588 [19569] network: resolv: Support an arbitrary number of search domains
2589 [19570] network: Implement random DNS server selection in the stub
2591 [19838] locale: localedef fails on PA-RISC
2592 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2593 order of 0D36 and 0D37
2594 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2596 [20098] libc: FAIL: debug/backtrace-tst on hppa
2597 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2599 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2601 [20313] localedata: Update locale data to Unicode 9.0
2602 [20424] manual: Document how to provide a malloc replacement
2603 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2605 [20686] locale: Add el_GR@euro to SUPPORTED.
2606 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2607 failures consistently
2608 [21015] dynamic-link: Document and fix --enable-bind-now
2609 [21016] nptl: pthread_cond support is broken on hppa
2610 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2611 frame-pointer on i386
2612 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2614 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2615 [21088] libc: Build fails with --enable-static-nss
2616 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2617 generic c code is used
2618 [21109] libc: Tunables broken on big-endian
2619 [21112] math: powf has large ulp errors with base close to 1 and exponent
2621 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2623 [21120] malloc: glibc malloc is incompatible with GCC 7
2624 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2626 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2627 (-0.0) when linking with -lieee
2628 [21171] math: log10, log2 and lgamma return incorrect results
2629 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2630 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2631 [21207] localedata: ce_RU: update weekdays from CLDR
2632 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2633 [21217] localedata: Update months from CLDR-31
2634 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2635 [21243] libc: support_delete_temp_file should issue warning for failed
2637 [21244] libc: support resolv_test_start() socket fd close should be
2639 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2640 new posix_spawn implementation
2641 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2642 leads to lower CPU frequency
2643 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2644 [21261] libc: [sparc64] bits/setjmp.h namespace
2645 [21267] network: [mips] bits/socket.h IOC* namespace
2646 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2647 [21270] libc: mmap64 silently truncates large offset values
2648 [21275] libc: posix_spawn always crashes on ia64 now
2649 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2650 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2651 [21289] libc: Incorrect declaration for 32-bit platforms with
2652 _FILE_OFFSET_BITS=64 causes build error
2653 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2654 not support gethostbyname4_r
2655 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2657 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2659 [21340] libc: Support POSIX_SPAWN_SETSID
2660 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2661 [21359] network: ns_name_pack needs additional byte in destination buffer
2662 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2663 against fragmentation attacks (CVE-2017-12132)
2664 [21369] network: resolv: Remove EDNS fallback
2665 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2667 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2668 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2669 [21393] stdio: Missing dup3 error check in freopen, freopen64
2670 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2671 [21399] localedata: Bad description for U00EC in
2672 localedata/charmaps/CP1254
2673 [21411] malloc: realloc documentation error
2674 [21426] network: sys/socket.h uio.h namespace
2675 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2676 [21445] libc: signal.h bsd_signal namespace
2677 [21455] network: Network headers stdint.h namespace
2678 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2680 [21475] network: resolv: Overlong search path is truncated mid-label
2681 [21511] libc: sigstack namespace
2682 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2683 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2684 bits/syscall.h: No such file or directory
2685 [21517] libc: struct sigaltstack namespace
2686 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2687 [21533] localedata: Update locale data to Unicode 10.0
2689 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2690 junk at end of line, first unrecognized character is `@'
2691 [21538] libc: SIG_HOLD missing for XPG4
2692 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2693 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2694 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2695 [21543] libc: sigevent namespace
2696 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2697 size for general purpose registers in mcontext_t structure
2698 [21550] libc: sigwait namespace
2699 [21552] libc: XPG4 bsd_signal namespace
2700 [21554] libc: sigpause namespace
2701 [21560] libc: sys/wait.h signal.h namespace
2702 [21561] libc: waitid namespace
2703 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2704 '/usr/include/stdlib.h': Permission denied
2705 [21575] libc: sys/wait.h missing struct rusage definition
2706 [21584] libc: sigaltstack etc namespace
2707 [21597] libc: siginterrupt namespace
2708 [21607] math: hppa: FAIL: math/test-tgmath
2709 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2711 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2712 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2713 stack and heap (CVE-2017-1000366)
2714 [21625] libc: wait3 namespace
2715 [21654] nss: Incorrect pointer alignment in NSS group merge result
2717 [21657] network: Parse interface zone id for node-local multicast
2718 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2720 [21666] libc: .symver is used on common symbol
2721 [21668] network: resolv: res_init cross-thread broadcast introduces race
2723 [21687] math: tgmath.h totalorder, totalordermag return type
2724 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2726 [21696] libc: Incorrect assumption of of __cpu_mask in
2727 posix/sched_cpucount.c
2728 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2729 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2731 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2732 leading to relocation crash
2733 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2734 `resolv_conf_matches (resp, conf)' failed.
2735 [21710] localedata: Added Samoan language locale for Samoa
2736 [21711] localedata: Pashto yesstr/nostr locale are missing
2737 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2738 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2739 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2740 [21723] localedata: yesstr/nostr missing for Chinese language locale
2741 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2743 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2745 [21728] localedata: New Locale for Tongan language
2746 [21729] localedata: incorrect LC_NAME fields for hi_IN
2747 [21733] localedata: yesstr and nostr are missing for zh_HK
2748 [21734] localedata: Missing yesstr and nostr are for kw_GB
2749 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2750 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2751 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2752 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2754 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2756 [21749] localedata: Wrong abbreviated day name (“abday”) for
2758 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2759 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2760 [21759] localedata: missing yesstr and nostr for Tigrinya
2761 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2762 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2763 [21767] localedata: Missing Bislama locales
2764 [21768] localedata: Missing yesstr and nostr for aa_ET
2765 [21770] localedata: Missing Field in li_NL
2766 [21778] nptl: Robust mutex may deadlock
2767 [21779] libc: MicroBlaze segfaults when loading libpthread
2768 [21783] localedata: Fix int_select international_call_prefixes
2769 [21784] localedata: Inconsistency in country_isbn
2770 [21788] localedata: Missing Country Postal Abbreviations
2771 [21794] localedata: Added-country_isbn-for-Italy
2772 [21795] localedata: Add/Fix country_isbn for France
2773 [21796] localedata: Added country_isbn for Republic of Korea
2774 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2775 [21799] localedata: Added int_select international_call_prefixes
2776 [21801] localedata: Added int_select international_call_prefixes
2777 [21804] nptl: Double semicolon in thread-shared-types.h
2778 [21807] localedata: LC_ADDRESS fix for pap_CW
2779 [21808] localedata: Fix LC_ADDRESS for pap_AW
2780 [21821] localedata: Added country_name in mai_IN
2781 [21822] localedata: Fix LC_TIME for mai_IN
2782 [21823] localedata: missing yesstr, nostr for sa_IN
2783 [21825] localedata: Fix name_mrs for mag_IN
2784 [21828] localedata: 2.26 changelog should mention user visible changes
2786 [21835] localedata: Added Maithili language locale for Nepal
2787 [21838] localedata: Removed redundant data for the_NP
2788 [21839] localedata: Fix LC_MONETARY for ta_LK
2789 [21844] localedata: Fix Latin characters and Months Sequence.
2790 [21848] localedata: Fix mai_NP Title Name
2795 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2796 24731-2:2010, is supported to enable declarations of functions from that
2797 TR. Note that not all functions from that TR are supported by the GNU C
2800 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2801 18661-1:2014, is supported to enable declarations of functions and macros
2802 from that TS. Note that not all features from that TS are supported by
2805 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2806 18661-4:2015, is supported to enable declarations of functions and macros
2807 from that TS. Note that most features from that TS are not supported by
2810 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2811 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2812 Since the GNU C Library defaults to a much newer revision of POSIX, this
2813 will only affect programs that specifically request an old conformance
2814 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2815 see a change in the visible declarations, but a program compiled with
2816 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2819 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2820 defined by all multithreaded code, but glibc has not required this for
2823 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2824 means that in a future release, the macros “major”, “minor”, and “makedev”
2825 will only be available from <sys/sysmacros.h>.
2827 These macros are not part of POSIX nor XSI, and their names frequently
2828 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2829 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2830 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2833 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2834 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2835 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2837 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2838 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2839 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2840 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2841 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2842 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2843 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2844 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2845 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2846 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2847 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2850 * New <math.h> features are added from TS 18661-1:2014:
2852 - Signaling NaN macros: SNANF, SNAN, SNANL.
2854 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2855 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2856 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2858 - llogb functions: the llogb, llogbf and llogbl functions, and the
2859 FP_LLOGB0 and FP_LLOGBNAN macros.
2861 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2864 - Comparison macros: iseqsig.
2866 - Classification macros: iscanonical, issubnormal, iszero.
2868 - Total order functions: totalorder, totalorderf, totalorderl,
2869 totalordermag, totalordermagf, totalordermagl.
2871 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2873 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2874 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2876 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2877 are added to libc. They convert a floating-point number into string.
2879 * Most of glibc can now be built with the stack smashing protector enabled.
2880 It is recommended to build glibc with --enable-stack-protector=strong.
2881 Implemented by Nick Alcock (Oracle).
2883 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2884 intended to be used instead of memset() to erase sensitive data after use;
2885 the compiler will not optimize out calls to explicit_bzero even if they
2886 are "unnecessary" (in the sense that no _correct_ program can observe the
2887 effects of the memory clear).
2889 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2890 to float instead of double. This does not affect the ABI of any libraries
2891 that are part of the GNU C Library, but may affect the ABI of other
2892 libraries that use this type in their interfaces.
2894 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2895 float_t and double_t types are now defined to long double instead of float
2896 and double. These options are not the default, and this does not affect
2897 the ABI of any libraries that are part of the GNU C Library, but it may
2898 affect the ABI of other libraries that use this type in their interfaces,
2899 if they are compiled or used with those options.
2901 * The getentropy and getrandom functions, and the <sys/random.h> header file
2904 * The buffer size for byte-oriented stdio streams is now limited to 8192
2905 bytes by default. Previously, on Linux, the default buffer size on most
2906 file systems was 4096 bytes (and thus remains unchanged), except on
2907 network file systems, where the buffer size was unpredictable and could be
2908 as large as several megabytes.
2910 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2911 for the Linux quota interface which predates kernel version 2.4.22 has
2914 * The malloc_get_state and malloc_set_state functions have been removed.
2915 Already-existing binaries that dynamically link to these functions will
2916 get a hidden implementation in which malloc_get_state is a stub. As far
2917 as we know, these functions are used only by GNU Emacs and this change
2918 will not adversely affect already-built Emacs executables. Any undumped
2919 Emacs executables, which normally exist only during an Emacs build, should
2920 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2922 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2923 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2924 “no-ip6-dotint” had already been the default, and support for the
2925 “ip6-dotint” option was removed from the Internet in 2006.
2927 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2928 flag from <resolv.h> have been removed. The option relied on a
2929 backwards-incompatible DNS extension which was never deployed on the
2932 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2933 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2934 They were already unimplemented.
2936 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2937 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2938 removed again from the IETF name lookup interface specification in RFC
2939 2553. Applications should use getaddrinfo instead.
2941 * DNSSEC-related declarations and definitions have been removed from the
2942 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2943 decode the data part of DNSSEC record types. Previous versions of glibc
2944 only implemented minimal support for the previous version of DNSSEC, which
2945 is incompatible with the currently deployed version.
2947 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2948 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2949 <arpa/nameser.h> header file because the distinction between RR types and
2950 meta-RR types is not officially standardized, subject to revision, and
2951 thus not suitable for encoding in a macro.
2953 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2954 and rhook members of the res_state type in <resolv.h> have been removed.
2955 The glibc stub resolver did not support these hooks, but the header file
2956 did not reflect that.
2958 * For multi-arch support it is recommended to use a GCC which has
2959 been built with support for GNU indirect functions. This ensures
2960 that correct debugging information is generated for functions
2961 selected by IFUNC resolvers. This support can either be enabled by
2962 configuring GCC with '--enable-gnu-indirect-function', or by
2963 enabling it by default by setting 'default_gnu_indirect_function'
2964 variable for a particular architecture in the GCC source file
2967 * GDB pretty printers have been added for mutex and condition variable
2968 structures in POSIX Threads. When installed and loaded in gdb these pretty
2969 printers show various pthread variables in human-readable form when read
2970 using the 'print' or 'display' commands in gdb.
2972 * Tunables feature added to allow tweaking of the runtime for an application
2973 program. This feature can be enabled with the '--enable-tunables' configure
2974 flag. The GNU C Library manual has details on usage and README.tunables has
2975 instructions on adding new tunables to the library.
2977 * A new version of condition variables functions have been implemented in
2978 the NPTL implementation of POSIX Threads to provide stronger ordering
2981 * A new version of pthread_rwlock functions have been implemented to use a more
2982 scalable algorithm primarily through not using a critical section anymore to
2985 Security related changes:
2987 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2988 have been created with makecontext could fail to terminate due to a
2989 missing .cantunwind annotation. This has been observed to lead to a hang
2990 (denial of service) in some Go applications compiled with gccgo. Reported
2991 by Andreas Schwab. (CVE-2016-6323)
2993 * The DNS stub resolver functions would crash due to a NULL pointer
2994 dereference when processing a query with a valid DNS question type which
2995 was used internally in the implementation. The stub resolver now uses a
2996 question type which is outside the range of valid question type values.
2999 The following bugs are resolved with this release:
3001 [4099] stdio: Overly aggressive caching by stream i/o functions.
3002 [7065] build: Support building glibc with -fstack-protector or -fstack-
3004 [9842] localedata: en_CA: incorrect date format
3005 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3006 before it started waiting
3007 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3008 [15765] nptl: sem_open is wrongly a cancellation point
3009 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3010 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3012 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3013 library linked with pthread
3014 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3015 "FIXME: Ingo" issue)
3016 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3017 [17252] libc: getrandom and getentropy syscall
3018 [17730] malloc: thread-local storage is sometimes improperly free()'d
3019 after being __libc_memalign()'d
3020 [18241] stdio: failed fseek on memstream does not set errno and can fail
3022 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3024 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3025 PTHREAD_PRIO_INHERIT mutex on ARM
3026 [18784] network: res_query and related function crash for special record
3027 type queries (CVE-2015-5180)
3028 [19380] math: strtod does not raise "inexact"
3029 [19387] string: Integer overflow in memchr
3030 [19390] string: Integer overflow in strncat
3031 [19398] build: linknamespace tests fail with massively parallel build
3032 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3034 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3035 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3036 [19514] libc: [PATCH] Fix spelling errors in spelling
3037 "implement"/"implementation" in several places
3038 [19582] network: Deprecate RES_USE_INET6
3039 [19673] manual: clog10 docs appear to be erroneous
3040 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3041 causes a segmentation fault
3042 [19826] libc: invalid pointer returned from __tls_get_addr with static
3044 [20016] network: resolv: Remove hooks support from the API
3045 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3047 [20033] math: [x86_64] vectorized math function don't call the __finite
3049 [20116] nptl: use after free in pthread_create
3050 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3051 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3053 [20311] nptl: please install proc_service.h
3054 [20366] libc: Compilation errors in installed headers in strict-compliance
3056 [20370] malloc: malloc: Arena free list management is still racy
3057 (incorrect fix in bug 19243)
3058 [20386] libc: assert (X = 0) does not result in GCC warning
3059 [20432] malloc: malloc: Minimize interface required for interposition
3060 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3061 in _Unwind_Backtrace (CVE-2016-6323)
3062 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3063 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3065 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3066 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3067 [20477] network: resolv: incorrect double-checked locking related to
3069 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3071 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3073 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3074 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3075 cause transition penalty
3076 [20517] math: sparcv9 missing fdiml compat symbol
3077 [20524] manual: strverscmp is inconsistent
3078 [20525] libc: <sys/quota.h> should be based on kernel headers
3079 [20539] math: GCC 7 -static -lm fails to link at -O3
3080 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3082 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3084 [20591] network: Remove obsolete DNSSEC support
3085 [20592] network: DNS resource record type classification macros in
3086 <arpa/nameser.h> are incorrect
3087 [20593] network: Update DNS RR type definitions
3088 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3089 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3091 [20629] network: libresolv: Remove support for bitstring labels
3093 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3094 assertion: "maxidx >= 2"
3095 [20660] math: [arm] Use VSQRT
3096 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3097 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3098 [20689] libc: Test for FMA should also check for AVX.
3099 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3100 [20715] math: iszero macro breaks existing code
3101 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3102 [20728] libc: powerpc: Missing TOC stub in clone
3103 [20729] build: glibc-2.24 fails to build for i486 with -Os
3104 [20750] build: Build fails with default PIE enabled gcc-6.x
3105 [20768] math: [alpha] sqrt fegetenv namespace
3106 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3108 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3109 __FLT_EVAL_METHOD__ is 2
3110 [20790] network: rpcgen buffer overrun in get_prog_declaration
3111 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3112 [20829] libc: crypt snprintf namespace
3113 [20847] libc: tst-vfork3 failure
3114 [20855] math: Default bits/mathdef.h has inappropriate float_t
3115 [20859] math: [sh4] FP_ILOGB0 invalid
3116 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3117 U+20AC), not same as GBK
3118 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3119 [20916] math: pow handling of sNaN arguments
3120 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3121 [20919] math: Bad pow (qNaN, 0) result with -lieee
3122 [20940] math: hypot sNaN handling
3123 [20947] math: fmax, fmin sNaN handling
3124 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3125 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3127 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3128 [20973] nptl: robust mutexes: Lost wake-ups
3129 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3130 [20978] nis: strlen on null pointer in nss_nisplus
3131 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3133 [21014] string: i686 memchr overflows internal pointer check
3134 [21019] libc: [mips] n32 lseek incorrect on overflow
3135 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3136 [21026] libc: [MIPS] readahead syscall is broken on n64
3137 [21028] math: Fallback fesetexceptflag should always succeed
3138 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3139 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3141 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3142 [21061] librt: [microblaze] librt lost clock_* exports
3143 [21073] libc: tunables: insecure environment variables passed to
3144 subprocesses with AT_SECURE
3145 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3149 * The minimum Linux kernel version that this version of the GNU C Library
3150 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3151 kernel version 2.6.32 or later suffices (on architectures that already
3152 required kernel versions more recent than 3.2, those requirements remain
3153 unchanged). Linux 3.2 or later kernel headers are required on all
3156 * The pap_AN locale has been deleted. This has been deprecated for a long
3157 time. It has been replaced by pap_AW & pap_CW, both of which have long
3158 been included in previous releases.
3160 * The readdir_r and readdir64_r functions have been deprecated. It is
3161 recommended to use readdir and readdir64 instead.
3163 * The type “union wait” has been removed. It was deprecated in the early
3164 1990s and never part of POSIX. Application code should use the int type
3165 instead of “union wait”.
3167 * A new NSS action is added to facilitate large distributed system
3168 administration. The action, MERGE, allows remote user stores like LDAP
3169 to be merged into local user stores like /etc/groups in order to provide
3170 easy to use, updated, and managed sets of merged credentials. The new
3171 action can be used by configuring it in /etc/nsswitch.conf:
3172 group: files [SUCCESS=merge] nis
3173 Implemented by Stephen Gallagher (Red Hat).
3175 * The deprecated __malloc_initialize_hook variable has been removed from the
3178 * The long unused localedef --old-style option has been removed. It hasn't
3179 done anything in over 16 years. Scripts using this option can safely
3182 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3183 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3184 return the next representable value in the direction of positive infinity
3185 and the nextdown functions return the next representable value in the
3186 direction of negative infinity. These are currently enabled as GNU
3189 Security related changes:
3191 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3192 could result in a stack overflow when getnetbyname was called with an
3193 overly long name. (CVE-2016-3075)
3195 * Previously, getaddrinfo copied large amounts of address data to the stack,
3196 even after the fix for CVE-2013-4458 has been applied, potentially
3197 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3198 instead. Reported by Michael Petlan. (CVE-2016-3706)
3200 * The glob function suffered from a stack-based buffer overflow when it was
3201 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3202 Reported by Alexander Cherepanov. (CVE-2016-1234)
3204 * The Sun RPC UDP client could exhaust all available stack space when
3205 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3206 alloca plugin for GCC. (CVE-2016-4429)
3208 * The IPv6 name server management code in libresolv could result in a memory
3209 leak for each thread which is created, performs a failing naming lookup,
3210 and exits. Over time, this could result in a denial of service due to
3211 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3213 The following bugs are resolved with this release:
3215 [1170] localedata: ne_NP: update Nepali locale definition file
3216 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3218 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3219 [6796] math: fdim() does not set errno on overflow
3220 [10354] libc: posix_spawn should use vfork() in more cases than presently
3221 [11213] localedata: localedata: add copyright disclaimer to locale files
3222 [12143] localedata: chr_US: new Cherokee locale
3223 [12450] localedata: sgs_LT: new locale
3224 [12676] localedata: ln_CD: new locale
3225 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3227 [13304] math: fma, fmaf, fmal produce wrong results
3228 [14259] build: --localedir arg to configure is ignored
3229 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3230 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3231 [14934] localedata: es_CL: wrong first weekday chilean locale
3232 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3234 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3236 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3237 [15368] nptl: raise() is not async-signal-safe
3238 [15479] math: ceil, floor, round and trunc raise inexact exception
3239 [15578] localedata: kk_KZ: various updates
3240 [16003] localedata: pap_AN: punt old locale
3241 [16137] localedata: iw_IL: punt old locale
3242 [16190] localedata: eo: new esperanto locale
3243 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3244 [16742] malloc: race condition: pthread_atfork() called before first
3245 malloc() results in unexpected locking behaviour/deadlocks
3246 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3248 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3249 [17565] localedata: pt_PT: wrong (work-)week start
3250 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3251 [17950] build: Build fails with -msse
3252 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3253 [18433] libc: posix_spawn does not return correctly upon failure to
3255 [18453] localedata: charmaps/IBM875: incorrect codes
3256 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3258 [18896] localedata: he_IL: improvements for currency
3259 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3260 Romanian locale data
3261 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3263 [19056] libc: Deprecate readdir_r
3264 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3266 [19198] localedata: nl_NL: small improvements for Dutch locales
3267 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3268 nameservers (CVE-2016-5417)
3269 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3271 [19400] locale: Language missing in "iso-639.def", trivial fix in
3273 [19431] malloc: Deadlock between fflush, getdelim, and fork
3274 [19505] libc: Incorrect file descriptor validity checks in
3275 posix_spawn_file_actions_add{open,close,dup2}
3276 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3277 when using RTLD_NEXT
3278 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3279 `intl/{gettextP,loadinfo}.h'
3280 [19534] libc: execle, execlp may use malloc
3281 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3282 [19573] network: res_nclose and __res_maybe_init disagree about name
3283 server initialization, breaking Hesiod
3284 [19575] localedata: Status of GB18030 tables
3285 [19581] localedata: sr_* date_fmt string contains additional newline
3286 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3288 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3289 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3290 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3291 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3293 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3295 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3297 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3298 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3299 [19633] locale: strfmon_l applies global locale to number formatting
3300 [19642] network: Memory leak in getnameinfo
3301 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3302 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3304 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3305 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3307 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3308 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3310 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3312 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3314 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3315 pointers and lengths in error-case.
3316 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3317 report errors on UTF-16 surrogates values.
3318 [19755] nscd: nscd assertion failure in gc
3319 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3320 [19759] libc: mempcpy shouldn't be inlined
3321 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3322 [19765] libc: s390 needs an optimized mempcpy
3323 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3324 NAME_MAX limit assumption (CVE-2016-1234)
3325 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3326 [19787] network: Missing and incorrect truncation checks in getnameinfo
3327 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3329 [19791] network: Assertion failure in res_query.c with un-connectable name
3331 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3332 [19822] math: libm.so install clobbers old version
3333 [19825] network: resolv: send_vc can return uninitialized data in second
3334 response to getaddrinfo
3335 [19830] network: nss_dns: should check RDATA length against buffer length
3336 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3337 confronted with A/AAAA records of invalid size
3338 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3339 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3340 [19853] stdio: Printing IBM long double in decimal with high precision is
3342 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3343 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3344 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3346 [19865] network: Assertion failure or memory leak in
3347 _nss_dns_getcanonname_r
3348 [19868] network: nss_dns: netent code does not skip over non-PTR records
3349 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3351 [19881] string: Improve x86-64 memset
3352 [19907] string: Incorrect memcpy tests
3353 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3355 [19925] libc: termios.h XCASE namespace
3356 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3357 [19929] libc: limits.h NL_NMAX namespace
3358 [19931] stdio: Memory leak in vfprintf
3359 [19957] libc: clone(CLONE_VM) access invalid parent memory
3360 [19963] localedata: en_IL: New locale
3361 [19989] stdio: stdio.h cuserid namespace
3362 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3364 [19996] locale: langinfo.h nl_langinfo_l namespace
3365 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3366 [20010] network: getaddrinfo: Stack overflow in hostent translation
3368 [20012] stdio: libio: fmemopen append mode failure
3369 [20014] stdio: stdio.h namespace for pre-threads POSIX
3370 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3371 [20023] libc: fcntl.h timespec namespace
3372 [20024] math: [x86_64] vectorized sincos trashes the stack
3373 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3374 [20041] time: sys/time.h timespec namespace
3375 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3376 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3377 [20051] libc: ttyslot in wrong header under wrong conditions
3378 [20054] libc: gethostname not declared for XPG4
3379 [20055] libc: termios.h missing tcgetsid for XPG4
3380 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3382 [20073] libc: sys/stat.h fchmod namespace
3383 [20074] libc: stdlib.h rand_r namespace
3384 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3385 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3387 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3388 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3390 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3391 [20119] libc: Wrong mask for processors level type from CPUID
3392 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3393 AS not supporting AVX512
3394 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3396 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3397 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3399 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3400 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3401 [20178] libc: posix_spawn{p} should not call exit
3402 [20191] stdio: libio: vtables hardening
3403 [20195] string: FMA4 detection requires CPUID execution with register
3405 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3406 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3408 [20212] math: acos (sNaN) returns sNaN
3409 [20213] math: asin (sNaN) returns sNaN
3410 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3411 [20218] math: [i386] asinhl (sNaN) returns sNaN
3412 [20219] math: [i386] atanhl (sNaN) returns sNaN
3413 [20222] stdio: fopencookie: Mangle function pointers
3414 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3415 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3416 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3418 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3419 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3420 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3421 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3422 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3423 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3424 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3425 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3426 [20240] math: modf (sNaN) returns sNaN
3427 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3428 [20250] math: frexp (sNaN) returns sNaN
3429 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3430 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3432 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3433 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3434 subscript is below array bounds [-Werror=array-bounds]
3435 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3436 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3438 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3439 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3441 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3442 "invalid" exceptions
3443 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3444 [20316] localedata: id_ID: Februari instead of Pebruari
3445 [20327] string: POWER8 strcasecmp returns incorrect result
3446 [20347] math: Failure: Test: j0_downward (0xap+0)
3447 [20348] libc: FAIL: misc/tst-preadvwritev64
3448 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3449 [20350] libc: There is no test for p{read,write}64
3450 [20357] math: Incorrect cos result for 1.5174239687223976
3451 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3455 * Unicode 8.0.0 Support: Character encoding, character type info, and
3456 transliteration tables are all updated to Unicode 8.0.0, using new
3457 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3458 These updates cause user visible changes, such as the fixes for bugs
3459 89, 16061, and 18568.
3461 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3462 kernel-internal CPU set size. This means that requests that change the
3463 CPU affinity which failed before (for example, an all-ones CPU mask) will
3464 now succeed. Applications that need to determine the effective CPU
3465 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3466 setting it because the kernel can adjust it (and the previous size check
3467 would not detect this in the majority of cases).
3469 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3470 the following new symbols are used: fts64_children, fts64_close,
3471 fts64_open, fts64_read and fts64_set.
3473 * getaddrinfo now detects certain invalid responses on an internal netlink
3474 socket. If such responses are received, an affected process will
3475 terminate with an error message of "Unexpected error <number> on netlink
3476 descriptor <number>" or "Unexpected netlink response of size <number> on
3477 descriptor <number>". The most likely cause for these errors is a
3478 multi-threaded application which erroneously closes and reuses the netlink
3479 file descriptor while it is used by getaddrinfo.
3481 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3482 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3483 unnecessary serialization of memory allocation requests across threads.
3484 The defect is now corrected. Users should see a substantial increase in
3485 the concurent throughput of allocation requests for applications which
3486 trigger this bug. Affected applications typically create and
3487 destroy threads frequently. (Bug 19048 was reported and analyzed by
3490 * There is now a --disable-timezone-tools configure option for disabling the
3491 building and installing of the timezone related utilities (zic, zdump, and
3492 tzselect). This is useful for people who build the timezone data and code
3493 independent of the GNU C Library.
3495 * The obsolete header <regexp.h> has been removed. Programs that require
3496 this header must be updated to use <regex.h> instead.
3498 * The obsolete functions bdflush, create_module, get_kernel_syms,
3499 query_module and uselib are no longer available to newly linked binaries;
3500 the header <sys/kdaemon.h> has been removed. These functions and header
3501 were specific to systems using the Linux kernel and could not usefully be
3502 used with the GNU C Library on systems with version 2.6 or later of the
3505 * Optimized string, wcsmbs and memory functions for IBM z13.
3506 Implemented by Stefan Liebler.
3508 * Newly linked programs that define a variable called signgam will no longer
3509 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3510 require signgam to be set by those functions must ensure that they use the
3511 variable provided by the GNU C Library and declared in <math.h>, without
3512 defining their own copy.
3514 * The minimum GCC version that can be used to build this version of the GNU
3515 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3516 still be used to compile programs using the GNU C Library.
3518 Security related changes:
3520 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3521 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3523 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3524 the pointer guard feature. It is always enabled. Previously,
3525 LD_POINTER_GUARD could be used to disable security hardening in binaries
3526 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3529 * An integer overflow in hcreate and hcreate_r could lead to an
3530 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3532 * The catopen function no longer has unbounded stack usage. Reported by
3533 Max. (CVE-2015-8779)
3535 * The nan, nanf and nanl functions no longer have unbounded stack usage
3536 depending on the length of the string passed as an argument to the
3537 functions. Reported by Joseph Myers. (CVE-2014-9761)
3539 * A stack-based buffer overflow was found in libresolv when invoked from
3540 libnss_dns, allowing specially crafted DNS responses to seize control
3541 of execution flow in the DNS client. The buffer overflow occurs in
3542 the functions send_dg (send datagram) and send_vc (send TCP) for the
3543 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3544 family. The use of AF_UNSPEC triggers the low-level resolver code to
3545 send out two parallel queries for A and AAAA. A mismanagement of the
3546 buffers used for those queries could result in the response of a query
3547 writing beyond the alloca allocated buffer created by
3548 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3549 the overflow. Thanks to the Google Security Team and Red Hat for
3550 reporting the security impact of this issue, and Robert Holiday of
3551 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3553 The following bugs are resolved with this release:
3555 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3556 [887] math: Math library function "logb" and "nextafter" inconsistent
3557 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3558 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3559 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3560 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3562 [4404] localedata: German translation of "Alarm clock" is misleading
3563 [6799] math: nextafter() and nexttoward() doen't set errno on
3564 overflow/underflow errors
3565 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3567 [10432] nis: _nss_nis_setnetgrent assertion failure
3568 [11460] libc: fts has no LFS support
3569 [12926] network: getaddrinfo()/make_request() may spin forever
3570 [13065] nptl: Race condition in pthread barriers
3571 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3572 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3574 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3575 [14912] libc: Rename non-installed bits/*.h headers
3576 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3577 [15367] math: Let gcc use __builtin_isinf
3578 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3579 [15421] math: lgamma wrongly sets signgam for ISO C
3580 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3581 FE_INVALID with argument out of range
3582 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3584 [15786] dynamic-link: ifunc resolver functions can smash function
3586 [15918] math: Unnecessary check for equality in hypotf()
3587 [16061] localedata: Review / update transliteration data
3588 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3590 [16141] time: strptime %z offset restriction
3591 [16171] math: drem should be alias of remainder
3592 [16296] math: fegetround is pure?
3593 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3594 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3596 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3597 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3599 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3600 "Exception "Inexact" set" on ppc32
3601 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3602 [16517] math: Missing underflow exception from tanf/tan/tanl
3603 [16519] math: Missing underflow exception from sinhf
3604 [16520] math: Missing underflow exception from tanhf
3605 [16521] math: Missing underflow exception from exp2
3606 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3608 [16734] stdio: fopen calls mmap to allocate its buffer
3609 [16961] math: nan function incorrect handling of bad sequences
3610 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3611 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3612 [16985] locale: localedef: confusing error message when opening output
3614 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3615 [17197] locale: Redundant shift character in iconv conversion output at
3617 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3618 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3619 [17250] dynamic-link: static linking breaks nss loading
3620 (getaddrinfo/getpwnam/etc...)
3621 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3623 [17441] math: isnan() should use __builtin_isnan() in GCC
3624 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3625 (related to lock elision)
3626 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3627 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3628 [17887] time: strptime should be able to parse "+01:00" style timezones
3629 [17905] libc: catopen() Multiple unbounded stack allocations
3631 [18084] libc: backtrace (..., 0) dumps core on x86
3632 [18086] libc: nice() sets errno to 0 on success
3633 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3634 is too large (CVE-2015-8778)
3635 [18251] dynamic-link: SONAME missing when audit modules provides path
3636 [18265] libc: add attributes for wchar string and memory functions
3637 [18370] math: csqrt missing underflows
3638 [18421] libc: [hppa] read-only segment has dynamic relocations
3639 [18472] libc: Obsolete syscall wrappers should be compat symbols
3640 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3641 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3642 [18525] localedata: Remove locale timezone information
3643 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3644 [18568] localedata: Update locale data to Unicode 8.0
3645 [18589] locale: sort-test.sh fails at random
3646 [18595] math: ctan, ctanh missing underflows
3647 [18604] libc: assert macro-expands its argument
3648 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3649 contains a vector instruction exception.
3650 [18611] math: j1, jn missing errno setting on underflow
3651 [18618] localedata: sync Chechen locale definitions with other *_RU
3653 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3654 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3655 [18665] network: In send_dg, the recvfrom function is NOT always using the
3656 buffer size of a newly created buffer (CVE-2015-7547)
3657 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3659 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3661 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3662 [18699] math: tilegx cproj() for various complex infinities does not yield
3664 [18724] libc: Harden put*ent functions against data injection
3665 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3666 [18755] build: build errors with -DNDEBUG
3667 [18757] stdio: fmemopen fails to set errno on failure
3668 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3670 [18781] libc: openat64 lacks O_LARGEFILE
3671 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3672 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3673 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3674 [18790] math: [ldbl-128ibm] tanhl inaccurate
3675 [18795] libc: stpncpy fortification misses buffer lengths that are
3676 statically too large
3677 [18796] build: build fails for --disable-mathvec
3678 [18803] math: hypot missing underflows
3679 [18820] stdio: fmemopen may leak memory on failure
3680 [18823] math: csqrt spurious underflows
3681 [18824] math: fma spurious underflows
3682 [18825] math: pow missing underflows
3683 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3684 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3685 [18870] build: sem_open.c fails to compile with missing symbol
3687 [18872] stdio: Fix memory leak in printf_positional
3688 [18873] libc: posix_fallocate overflow check ineffective
3689 [18875] math: Excess precision leads incorrect libm
3690 [18877] libc: arm: mmap offset regression
3691 [18887] libc: memory corruption when using getmntent on blank lines
3692 [18918] localedata: hu_HU: change time to HH:MM:SS format
3693 [18921] libc: Regression: extraneous stat() and fstat() performed by
3695 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3696 binaries (CVE-2015-8777)
3697 [18951] math: tgamma missing underflows
3698 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3700 [18953] localedata: lt_LT: change currency symbol to the euro
3701 [18956] math: powf inaccuracy
3702 [18961] math: [i386] exp missing underflows
3703 [18966] math: [i386] exp10 missing underflows
3704 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3705 [18969] build: multiple string test failures due to missing locale
3707 [18970] libc: Reference of pthread_setcancelstate in libc.a
3708 [18977] math: float / long double Bessel functions not in XSI POSIX
3709 [18980] math: i386 libm functions return with excess range and precision
3710 [18981] math: i386 scalb*, ldexp return with excess range and precision
3711 [18982] stdio: va_list and vprintf
3712 [18985] time: Passing out of range data to strftime() causes a segfault
3714 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3715 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3716 [19012] locale: iconv_open leaks memory on error path
3717 [19016] math: clog, clog10 inaccuracy
3718 [19018] nptl: Mangle function pointers in tls_dtor_list
3719 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3720 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3721 [19048] malloc: malloc: arena free list can become cyclic, increasing
3723 [19049] math: [powerpc] erfc incorrect zero sign
3724 [19050] math: [powerpc] log* incorrect zero sign
3725 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3726 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3727 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3728 [19074] network: Data race in _res_hconf_reorder_addrs
3729 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3730 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3731 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3733 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3735 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3736 [19086] manual: posix_fallocate64 documented argument order is wrong.
3737 [19088] math: lround, llround missing exceptions close to overflow
3739 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3740 [19095] math: dbl-64 lrint incorrect for 64-bit long
3741 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3742 [19124] dynamic-link: ld.so failed to build with older assmebler
3743 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3744 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3745 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3746 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3747 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3748 pthread_setaffinity_np
3749 [19156] math: [ldbl-128] j0l spurious underflows
3750 [19164] nptl: tst-getcpu fails with many possible CPUs
3751 [19168] math: math/test-ildoubl and math/test-ldouble failure
3752 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3753 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3755 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3756 (FE_NOMASK_ENV) do not clear SSE exceptions
3757 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3758 _int_new_arena/reused_arena
3759 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3760 [19201] math: dbl-64 remainder incorrect sign of zero result
3761 [19205] math: bits/math-finite.h conditions do not match math.h and
3763 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3764 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3765 for C99-based standards
3766 [19212] libc: features.h not -Wundef clean
3767 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3769 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3770 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3771 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3773 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3774 "inexact" exceptions
3775 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3777 [19242] libc: strtol incorrect in Turkish locales
3778 [19243] malloc: reused_arena can pick an arena on the free list, leading
3779 to an assertion failure and reference count corruption
3780 [19253] time: tzset() ineffective when temporary TZ did not include DST
3782 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3783 [19270] math: [hppa] Shared libm missing __isnanl
3784 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3785 MAP_HUGETLB and MAP_STACK defines
3786 [19313] nptl: Wrong __cpu_mask for x32
3787 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3788 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3789 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3790 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3791 [19363] time: x32: times() return value wrongly truncates/sign extends
3793 [19367] dynamic-link: Improve branch prediction on Silvermont
3794 [19369] network: Default domain name not reset by res_ninit when "search"
3795 / "domain" entry is removed from resolv.conf
3796 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3798 [19385] localedata: bg_BG: time separator should be colon, not comma
3799 [19408] libc: linux personality syscall wrapper may erroneously return an
3800 error on 32-bit architectures
3801 [19415] libc: dladdr returns wrong names on hppa
3802 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3803 IBM905, IBM907, and IBM909
3804 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3805 [19443] build: build failures with -DDEBUG
3806 [19451] build: Make check fails on test-double-vlen2
3807 [19462] libc: Glibc failed to build with -Os
3808 [19465] math: Wrong code with -Os
3809 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3811 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3813 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3814 [19486] math: S390: Math tests fail with "Exception Inexact set".
3815 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3816 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3818 [19590] math: Fail to build shared objects that use libmvec.so functions.
3822 * The following bugs are resolved with this release:
3824 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3825 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3826 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3827 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3828 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3829 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3830 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3831 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3832 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3833 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3834 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3835 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3836 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3837 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3838 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3839 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3840 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3841 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3842 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3843 18657, 18676, 18694, 18696, 18887.
3845 * Cache information can be queried via sysconf() function on s390 e.g. with
3846 _SC_LEVEL1_ICACHE_SIZE as argument.
3848 * A buffer overflow in gethostbyname_r and related functions performing DNS
3849 requests has been fixed. If the NSS functions were called with a
3850 misaligned buffer, the buffer length change due to pointer alignment was
3851 not taken into account. This could result in application crashes or,
3852 potentially arbitrary code execution, using crafted, but syntactically
3853 valid DNS responses. (CVE-2015-1781)
3855 * The time zone file parser has been made more robust against crafted time
3856 zone files, avoiding heap buffer overflows related to the processing of
3857 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3858 large time zone data files. Overly long time zone specifiers in the TZ
3859 variable no longer result in stack overflows and crashes.
3861 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3862 for LD and GD on x86 and x86-64, has been implemented. You will need
3863 binutils-2.24 or later to enable this optimization.
3865 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3866 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3867 Hat). These updates cause user visible changes, such as the fix for bug
3870 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3871 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3872 condition in some applications.
3874 * Added vector math library named libmvec with the following vectorized x86_64
3875 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3877 The library can be disabled with --disable-mathvec. Use of the functions is
3878 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3879 Shared library libmvec.so is linked in as needed when using -lm (no need to
3880 specify -lmvec explicitly for not static builds).
3881 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3883 * A new fmemopen implementation has been added with the goal of POSIX
3884 compliance. The new implementation fixes the following long-standing
3885 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3886 old implementation is still present for use be by existing binaries.
3888 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3889 releases. It has been fixed to match 2.19 and older, but binaries built
3890 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3892 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3893 Contributed by Roland McGrath (Google).
3895 * The header <regexp.h> is deprecated, and will be removed in a future
3896 release. Use of this header will trigger a deprecation warning.
3897 Application developers should update their code to use <regex.h> instead.
3899 This header was formerly part of SUS, but was deprecated in 1994 and
3900 removed from the standard in 2001. Also, the glibc implementation
3901 leaks memory. See BZ#18681 for more details.
3905 * The following bugs are resolved with this release:
3907 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3908 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3909 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3910 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3911 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3912 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3913 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3914 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3915 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3916 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3919 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3920 too little memory for the to-be-scanned arguments and overflow the
3921 allocated buffer. The implementation now correctly computes the required
3922 buffer size when using malloc, and switches to malloc from alloca as
3925 * A new semaphore algorithm has been implemented in generic C code for all
3926 machines. Previous custom assembly implementations of semaphore were
3927 difficult to reason about or ensure that they were safe. The new version
3928 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3929 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3930 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3932 * Port to Altera Nios II has been contributed by Mentor Graphics.
3934 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3935 implementations for powerpc64/powerpc64le.
3936 Implemented by Adhemerval Zanella (IBM).
3938 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3939 and powerpc64le. This may improve lock scaling of existing programs on
3940 HTM capable systems. The lock elision code is only enabled with
3941 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3942 powerpc will issue a transaction abort on every syscall to avoid side
3943 effects being visible outside transactions.
3945 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3946 AArch64. Contributed by ARM Ltd.
3948 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3950 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3951 under certain input conditions resulting in the execution of a shell for
3952 command substitution when the application did not request it. The
3953 implementation now checks WRDE_NOCMD immediately before executing the
3954 shell and returns the error WRDE_CMDSUB as expected.
3956 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3957 processing format strings with a large number of format specifiers.
3959 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3960 infinite loop if the DNS response contained a PTR record of an unexpected
3963 * The minimum GCC version that can be used to build this version of the GNU
3964 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3965 still be used to compile programs using the GNU C Library.
3967 * The GNU C Library is now built with -Werror by default. This can be
3968 disabled by configuring with --disable-werror.
3970 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3972 * The obsolete sigvec function has been removed. This was the original
3973 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3974 programs have been using instead for about 25 years. Of course, ABI
3975 compatibility for old binaries using sigvec remains intact.
3977 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3978 with newer versions of bison.
3980 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3981 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3982 registers overlay two consecutive single-precision registers. MIPS32R2
3983 introduced a new FPU mode (FR=1) where double-precision registers extend the
3984 corresponding single-precision registers which is incompatible with the
3985 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3986 require the use of FR=1 making a transition necessary. New o32 ABI
3987 extensions enable users to migrate over time from the original o32 ABI
3988 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3989 tracks the ABI of any loaded object and verifies that new objects are
3990 compatible. Mode transitions will also be requested as required and
3991 unsupportable objects will be rejected. The ABI checks include both soft and
3992 hard float ABIs for o32, n32 and n64.
3994 GCC 5 with GNU binutils 2.25 onwards:
3995 It is strongly recommended that all o32 system libraries are built using the
3996 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3997 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3998 compiler using --with-fp-32=xx to set this by default.
4002 * The following bugs are resolved with this release:
4004 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4005 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4006 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4007 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4008 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4009 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4010 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4011 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4012 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4013 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4014 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4015 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4016 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4017 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4018 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4020 * Reverted change of ABI data structures for s390 and s390x:
4021 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4022 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4023 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4024 are preserved pointing straight to the same implementation as the old ones.
4025 Given that, new callers will simply provide a too-big buffer to these
4026 functions. Any applications/libraries out there that embed jmp_buf or
4027 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4028 against 2.19 headers will have to rebuilt again. This is necessary in any
4029 case to revert the breakage in their ABI caused by the glibc change.
4031 * Support for file description locks is added to systems running the
4032 Linux kernel. The standard file locking interfaces are extended to
4033 operate on file descriptions, not file descriptors, via the use of
4034 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4035 are associated with an open file instead of a process.
4037 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4039 * The minimum Linux kernel version that this version of the GNU C Library
4040 can be used with is 2.6.32.
4042 * Running the testsuite no longer terminates as soon as a test fails.
4043 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4044 with PASS or FAIL lines for individual tests. A summary of the results is
4045 printed, including a list of failing lists, and "make check" exits with
4046 error status if there were any unexpected failures. "make check
4047 stop-on-test-failure=y" may be used to keep the old behavior.
4049 * The am33 port, which had not worked for several years, has been removed
4052 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4053 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4054 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4055 conflicted with POSIX (support for which was removed in 2.19), the
4056 interfaces those macros enabled remain available when compiling with
4057 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4058 test macros defined.
4060 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4062 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4063 This may improve lock scaling of existing programs on TX capable systems.
4064 The lock elision code is only built with --enable-lock-elision=yes and
4065 then requires a GCC version supporting the TX builtins. With lock elision
4066 default mutexes are elided via __builtin_tbegin, if the cpu supports
4067 transactions. By default lock elision is not enabled and the elision code
4070 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4071 copy the path argument. This allowed programs to cause posix_spawn to
4072 deference a dangling pointer, or use an unexpected pathname argument if
4073 the string was modified after the posix_spawn_file_actions_addopen
4076 * All supported architectures now use the main glibc sysdeps directory
4077 instead of some being in a separate "ports" directory (which was
4078 distributed separately before glibc 2.17).
4080 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4081 On configurations that support it (all Linux configurations), it's now
4082 used regardless of the --enable-add-ons switch to configure. It is no
4083 longer possible to build such configurations without pthreads support.
4085 * Locale names, including those obtained from environment variables (LANG
4086 and the LC_* variables), are more tightly checked for proper syntax.
4087 setlocale will now fail (with EINVAL) for locale names that are overly
4088 long, contain slashes without starting with a slash, or contain ".." path
4089 components. (CVE-2014-0475) Previously, some valid locale names were
4090 silently replaced with the "C" locale when running in AT_SECURE mode
4091 (e.g., in a SUID program). This is no longer necessary because of the
4094 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4095 with application code using Intel MPX instructions. (With all previous
4096 versions, the MPX register state could be clobbered when making calls
4097 into or out of a shared library.) Note that while the new dynamic
4098 linker is compatible with all known x86 hardware whether or not it
4099 supports Intel MPX, some x86 instruction-set emulators might fail to
4100 handle the new instruction encodings. This is known to affect Valgrind
4101 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4102 release), and might affect other tools that do instruction emulation.
4104 * Support for loadable gconv transliteration modules has been removed.
4105 The support for transliteration modules has been non-functional for
4106 over a decade, and the removal is prompted by security defects. The
4107 normal gconv conversion modules are still supported. Transliteration
4108 with //TRANSLIT is still possible, and the //IGNORE specifier
4109 continues to be supported. (CVE-2014-5119)
4111 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4112 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4113 resulting a denial-of-service security vulnerability in applications which
4114 use functions related to iconv. (CVE-2014-6040)
4118 * The following bugs are resolved with this release:
4120 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4121 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4122 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4123 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4124 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4125 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4126 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4127 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4128 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4129 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4130 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4131 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4132 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4133 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4134 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4135 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4136 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4137 16431, 16453, 16474, 16506, 16510, 16529
4139 * Slovenian translations for glibc messages have been contributed by the
4140 Translation Project's Slovenian team of translators.
4142 * The public headers no longer use __unused nor __block. This change is to
4143 support compiling programs that are derived from BSD sources and use
4144 __unused internally, and to support compiling with Clang's -fblock
4145 extension which uses __block.
4147 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4148 large collation sequences to optimize multiple passes. This cache
4149 computation may overflow for large collation sequences and may cause a
4150 stack or buffer overflow. This is now fixed to use a slower algorithm
4151 which does not use a cache if there is an integer overflow.
4153 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4154 rules for large collation sequences to optimize multiple passes and falls
4155 back to alloca if malloc fails, resulting in a possible stack overflow.
4156 The implementation now falls back to an uncached collation sequence lookup
4159 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4160 initialized for static applications resulting in the security feature
4161 being disabled. The pointer guard is now correctly initialized to a
4162 random value for static applications. Existing static applications need
4163 to be recompiled to take advantage of the fix (bug 15754).
4165 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4166 to the d_name member of struct dirent, or omit the terminating NUL
4167 character. (Bugzilla #14699).
4169 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4170 aligned_alloc functions could allocate too few bytes or corrupt the
4171 heap when passed very large allocation size values (Bugzilla #15855,
4174 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4175 for AF_INET6 has been fixed (Bugzilla #16072).
4177 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4178 pap_CW, quz_PE, the_NP.
4180 * Substantially revised locales: gd_GB, ht_HT
4182 * The LC_ADDRESS field was updated to support country_car for almost all
4185 * ISO 1427 definitions were updated.
4187 * ISO 3166 definitions were updated.
4189 * The localedef utility now supports --big-endian and --little-endian
4190 command-line options to generate locales for a different system from that
4191 for which the C library was built.
4193 * Binary locale files now only depend on the endianness of the system for
4194 which they are generated and not on other properties of that system. As a
4195 consequence, binary files generated with new localedef may be incompatible
4196 with old versions of the GNU C Library, and binary files generated with
4197 old localedef may be incompatible with this version of the GNU C Library,
4198 in the following circumstances:
4200 + Locale files may be incompatible on m68k systems.
4202 + Locale archive files (but not separate files for individual locales) may
4203 be incompatible on systems where plain "char" is signed.
4205 * The configure option --disable-versioning has been removed. Builds with
4206 --disable-versioning had not worked for several years.
4208 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4209 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4211 * SystemTap probes for malloc have been introduced.
4213 * SystemTap probes for slow multiple precision fallback paths of
4214 transcendental functions have been introduced.
4216 * Support for powerpc64le has been added.
4218 * The soft-float powerpc port now supports e500 processors.
4220 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4222 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4223 set of header declarations that are enabled by default, even when other
4224 feature test macros or compiler options such as -std=c99 would otherwise
4225 disable some of those declarations.
4227 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4228 conflict with POSIX. The libbsd-compat library (which was a dummy library
4229 that did nothing) has also been removed.
4231 * Preliminary documentation about Multi-Thread, Async-Signal and
4232 Async-Cancel Safety has been added.
4234 * Change of ABI data structures for s390 and s390x:
4235 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4236 allow for future hardware extensions. All library functions that accept or
4237 return these structures were versioned in order to provide backwards
4238 compatibility with existing code. However, not all cases can be handled
4239 with interface versioning. If an application embeds either structure into
4240 another structure and that structure is passed to another compilation unit
4241 which expects the newer larger-sized object then any access to the new
4242 fields will result in undefined behaviour. Similarly any access to fields
4243 that were moved by the enlarging of the structures will cause undefined
4244 behaviour. To fix the undefined behaviour all objects that are part of the
4245 final in-memory image must agree on the size of structures, and this may
4246 require recompilation.
4250 * The following bugs are resolved with this release:
4252 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4253 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4254 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4255 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4256 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4257 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4258 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4259 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4260 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4261 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4262 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4263 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4264 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4267 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4268 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4269 Distributions can re-enable building and using pt_chown via the new configure
4270 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4271 considerable security risks and should only be used if the distribution
4272 understands and accepts the risks.
4274 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4277 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4278 fixed (Bugzilla #15330).
4280 * Add support for calling C++11 thread_local object destructors on thread
4281 and program exit. This needs compiler support for offloading C++11
4282 destructor calls to glibc.
4284 * Improved worst case performance of libm functions with double inputs and
4287 * Support for priority inherited mutexes in pthread condition variables on
4288 non-x86 architectures.
4290 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4292 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4294 * Optimized string functions for ARM. Implemented by Will Newton and
4297 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4299 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4302 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4303 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4305 * Added a benchmark framework to track performance of functions in glibc.
4307 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4308 It is based on draft TS 18661 and currently enabled as a GNU extension.
4310 * On Linux, the clock function now uses the clock_gettime system call
4311 for improved precision, rather than old times system call.
4313 * Added support for version-3 tz format files. This is needed when using
4314 the tz database release 2013e or later, and affects a few unusual cases --
4315 currently only TZ='America/Godthab' for time stamps after 2037.
4317 * Added new API functions pthread_getattr_default_np and
4318 pthread_setattr_default_np to get and set the default pthread
4319 attributes of a process.
4321 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4322 This may improve lock scaling of existing programs on TSX capable systems.
4323 When the --enable-lock-elision=yes parameter is specified at configure
4324 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4327 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4328 availability). Implemented by Ryan S. Arnold.
4330 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4334 * The following bugs are resolved with this release:
4336 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4337 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4338 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4339 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4340 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4341 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4342 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4343 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4344 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4345 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4346 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4347 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4348 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4349 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4350 14879, 14889, 14893, 14898, 14914.
4352 * Optimization of memcpy for MIPS.
4354 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4355 EMFILE has been fixed (Bugzilla #14889).
4357 * The add-on ports collection is now distributed in the "ports" subdirectory
4358 of the main GNU C Library distribution, rather than separately.
4360 * Port to ARM AArch64 contributed by Linaro.
4362 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4363 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4365 Implemented by Andreas Krebbel.
4367 * The new function secure_getenv allows secure access to the environment,
4368 returning NULL if running in a SUID/SGID process. This function replaces
4369 the internal function __secure_getenv.
4371 * SystemTap static probes have been added into the dynamic linker.
4372 Implemented by Gary Benson.
4374 * Optimizations of string functions strstr, strcasestr and memmem.
4375 Implemented by Maxim Kuvyrkov.
4377 * The minimum Linux kernel version that this version of the GNU C Library
4378 can be used with is 2.6.16.
4380 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4381 powerpc POWER7. Implemented by Will Schmidt.
4383 * New configure option --disable-nscd builds the C library such that it
4384 never attempts to contact the Name Service Caching Daemon (nscd).
4385 New configure option --disable-build-nscd avoids building nscd itself;
4386 this is the default if --disable-nscd is used.
4388 * Improved support for cross-compilation, including cross-testing and
4389 bootstrap builds without a previously built glibc.
4391 * Several testsuite tests are now able to test multiple IFUNC variants of an
4392 interface, rather than just testing the one that would be chooen by
4395 * New configure options --with-bugurl and --with-pkgversion, for
4396 distributors to use to embed their bug-reporting and package version
4397 information in --help and --version output.
4399 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4400 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4401 allows creation of chroots without the procfs mounted on /proc.
4403 * The `crypt' function now fails if passed salt bytes that violate the
4404 specification for those values. On Linux, the `crypt' function will
4405 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4406 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4407 when the mode is enabled.
4409 * The `clock_*' suite of functions (declared in <time.h>) is now available
4410 directly in the main C library. Previously it was necessary to link with
4411 -lrt to use these functions. This change has the effect that a
4412 single-threaded program that uses a function such as `clock_gettime' (and
4413 is not linked with -lrt) will no longer implicitly load the pthreads
4414 library at runtime and so will not suffer the overheads associated with
4415 multi-thread support in other code such as the C++ runtime library.
4417 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4422 * The following bugs are resolved with this release:
4424 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4425 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4426 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4427 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4428 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4429 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4430 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4431 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4432 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4433 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4434 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4435 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4436 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4437 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4438 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4439 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4440 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4441 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4442 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4443 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4444 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4445 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4448 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4449 configuring glibc with:
4450 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4451 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4452 Implemented by H.J. Lu.
4456 + define static_assert
4458 + do not declare gets
4460 + declare at_quick_exit and quick_exit also for ISO C11
4462 + aligned_alloc. NB: The code is deliberately allows the size parameter
4463 to not be a multiple of the alignment. This is a moronic requirement
4464 in the standard but it is only a requirement on the caller, not the
4467 + timespec_get added
4469 + uchar.h support added
4471 + CMPLX, CMPLXF, CMPLXL added
4473 Implemented by Ulrich Drepper.
4475 * Support for the IA-64 has been moved to ports.
4477 * Remove support for anything but ELF binary format
4479 * Checking versions of poll, ppoll added.
4480 Implemented by Ulrich Drepper.
4482 * More generic and 64-bit performance optimizations to math functions.
4483 Implemented by Ulrich Drepper.
4485 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4486 headers and functions available at compile time as they were before
4487 version 2.14. This option will be removed at some time in the future
4488 after the TI-RPC library becomes fully sufficient for the needs of
4489 existing applications.
4491 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4492 Note that glibc is not expected to work with any Linux kernel version
4495 * New header <sys/auxv.h> and function getauxval allowing easy access to
4496 the AT_* key-value pairs passed from the Linux kernel. The header also
4497 defines the HWCAP_* bits associated with the AT_HWCAP key.
4499 * New locales: mag_IN
4501 * New configure option --enable-systemtap builds SystemTap static probes
4502 into libc for setjmp and longjmp and into libpthread for various operations.
4503 So far the setjmp/longjmp probes and some of the libpthread probes are
4504 provided only for i*86 and x86_64.
4505 Implemented by Roland McGrath and Rayson Ho.
4507 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4509 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4512 * More optimized functions for SPARC. Implemented by David S. Miller.
4514 * Improved support for cross-compilation, especially bootstrap builds
4515 without a previously built glibc.
4517 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4518 Chris Metcalf from Tilera.
4520 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4521 now supported for ARM processors.
4523 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4524 as the name of the dynamic linker, to distinguish it from the
4525 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4527 * Support for CRIS has been removed from ports.
4529 * A new class of installed header has been documented for low-level
4530 platform-specific functionality. PowerPC added the first instance with a
4531 function to provide time base register access. Contributed by Tulio
4532 Magno Quites Machado Filho.
4534 * ix86 configurations now install header files that are consistent with
4535 what x86-64 configurations install. These same header files can be used
4536 for -m32, -m64, or -mx32 builds.
4537 Contributed by H.J. Lu.
4539 * Math library bug fixes. A thorough audit of all open math library bugs was
4540 conducted by Joseph Myers. Significant progress was made on many math
4541 library bugs resulting in more accurate exceptions and function results.
4542 Many thanks to all those that contributed including Andreas Jaeger for his
4543 patch review and work on the x87 trigonometric instruction issues.
4545 * Timezone data is no longer installed. Timezone-related binaries and scripts
4546 will continue to be installed. Users should obtain their timezone data from
4547 their distribution provider or from the tzdata package at
4548 <ftp://munnari.oz.au/pub/>.
4552 * The following bugs are resolved with this release:
4554 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4555 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4556 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4557 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4558 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4559 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4560 13484, 13506, 13515, 13523, 13524, 13538, 13540
4562 * New program pldd to list loaded object of a process
4563 Implemented by Ulrich Drepper.
4565 * Add nss_db support back to glibc. No more dependency on Berkeley db
4566 and support for initgroups lookups.
4567 Implemented by Ulrich Drepper.
4569 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4570 Contributed by HJ Lu.
4572 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4573 Contributed by HJ Lu.
4575 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4576 on x86-32 and x86-64.
4577 Contributed by Liubov Dmitrieva.
4579 * Optimized strchr and strrchr for SSE on x86-32.
4580 Contributed by Liubov Dmitrieva.
4582 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4583 for x86-64 and x86-32.
4584 Contributed by Liubov Dmitrieva.
4586 * New interfaces: scandirat, scandirat64
4587 Implemented by Ulrich Drepper.
4589 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4590 Implemented by Ulrich Drepper.
4592 * nscd now also caches the netgroup database.
4593 Implemented by Ulrich Drepper.
4595 * Integrate libm with gcc's -ffinite-math-only option.
4596 Implemented by Ulrich Drepper.
4598 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4599 to math functions. Implemented by Ulrich Drepper.
4601 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4602 Implemented by Ulrich Drepper.
4604 * New Linux interfaces: process_vm_readv, process_vm_writev
4606 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4607 Implemented by Ulrich Drepper.
4609 * Optimized nearbyint and strcasecmp for PPC.
4610 Implemented by Adhemerval Zanella.
4612 * New locales: bho_IN, unm_US, es_CU, ta_LK
4616 * The following bugs are resolved with this release:
4618 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4619 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4620 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4621 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4622 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4623 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4624 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4625 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4626 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4627 12795, 12811, 12813, 12814, 12841
4629 * The RPC implementation in libc is obsoleted. Old programs keep working
4630 but new programs cannot be linked with the routines in libc anymore.
4631 Programs in need of RPC functionality must be linked against TI-RPC.
4632 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4634 Visible changes of this change include (obviously) the inability to link
4635 programs using RPC functions without referencing the TI-RPC library and the
4636 removal of the RPC headers from the glibc headers.
4637 Implemented by Ulrich Drepper.
4639 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4640 syncfs, setns, sendmmsg
4642 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4643 yue_HK, lij_IT, mhr_RU
4645 * New encodings: CP770, CP771, CP772, CP773, CP774
4647 * New program sotruss to trace calls through PLTs
4648 Implemented by Ulrich Drepper.
4650 * The malloc hook implementation is marked deprecated and will be removed
4651 from the default implementation in the next version. The design never
4652 worked ever since the introduction of threads. Even programs which do
4653 not create threads themselves can use multiple threads created internally.
4657 * The following bugs are resolved with this release:
4659 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4660 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4661 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4662 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4665 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4667 * POWER7 optimizations: memset, memcmp, strncmp
4669 * New optimized string functions for x86-64: strnlen (SSE2),
4670 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4671 Implemented by Ulrich Drepper.
4675 * The following bugs are resolved with this release:
4677 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4678 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4679 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4680 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4681 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4682 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4683 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4684 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4686 * New interfaces: pthread_getname_np, pthread_setname_np
4688 * New Linux interface: recvmmsg
4690 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4692 * The dynamic linker now recognizes supported ABI versions from the
4693 EI_ABIVERSION field in the ELF header.
4694 Implemented by Ulrich Drepper.
4696 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4697 will not be used to fill in password fields in the passwd.byname replies.
4698 Instead it is used to synthesize the shadow.byname table, should it be
4699 missing. This is a useful mode in some installations involving Solaris.
4700 Implemented by Ulrich Drepper.
4702 * New locales: kok_IN, sq_MK, cv_RU
4706 * The following bugs are resolved with this release:
4708 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4709 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4710 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4711 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4712 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4713 10789, 10817, 10823, 10840, 10847
4715 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4717 Implemented by Ulrich Drepper.
4719 * Checking version of longjmp added that fails if an uninitialized stack
4720 frame would be created. Implemented by Ulrich Drepper.
4722 * STT_GNU_IFUNC is now supported in static executables.
4723 Implemented by H.J. Lu.
4725 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4727 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4728 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4729 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4730 Contributed by H.J. Lu.
4732 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4733 Implemented by Ulrich Drepper.
4735 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4737 Contributed by H.J. Lu.
4739 * Support for fma instruction in AVX on x86-64.
4740 Implemented by H.J. Lu and Ulrich Drepper.
4742 * AVX support in x86-64 auditing support in ld.so.
4743 Implemented by H.J. Lu.
4745 * STB_GNU_UNIQUE support added.
4746 Implemented by Ulrich Drepper.
4748 * Implement second fallback mode for optimized DNS lookup for even more
4749 broken environments. If two requests from the same port are not
4750 handled correctly close the socket and open a new one before sending
4751 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4752 can be used to select this mode right away, instead of rediscovering the
4753 necessity is every process again.
4754 Implemented by Ulrich Drepper.
4756 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4757 Implemented by Adam Tkac.
4759 * Optimized iconv conversions for S390x.
4760 Implemented by Andreas Krebbel.
4762 * Using condvars with PI mutexes is now more efficient due to kernel
4763 support for requeueing to PI futexes. NPTL support added for x86-64.
4764 Implemented by Ulrich Drepper.
4766 * New locales: ps_AF, my_MM
4770 * The following bugs are resolved with this release:
4772 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4773 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4774 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4775 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4776 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4778 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4779 Implemented by Ulrich Drepper.
4781 * New Linux interfaces: accept4, fallocate, fallocate64.
4782 Implemented by Ulrich Drepper.
4784 * Correct declarations of string function when used in C++ code. This
4785 could lead to compile errors for invalid C++ code.
4787 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4790 * New POSIX 2008 interface: psiginfo
4791 Implemented by Ulrich Drepper.
4793 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4794 Implemented by Ulrich Drepper.
4796 * Support for selecting between multiple function definitions at runtime
4797 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4799 * The libcrypt library can now use the hash function implementations in
4800 NSS. Implemented by Ulrich Drepper.
4802 * The malloc implementation can be compiled to be less memory efficient
4803 but higher performing in multi-threaded programs.
4804 Implemented by Ulrich Drepper.
4806 * New locales: nan_TW@latin, ks_IN
4808 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4809 Implemented by Ulrich Drepper.
4811 * Extended printf hook support. It is possible to use user-defined types
4812 and extend existing format specifiers.
4813 Implemented by Ulrich Drepper.
4815 * Handling for group shadow files has been added.
4816 Implemented by Ulrich Drepper.
4818 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4819 servers (the case, e.g., for some people using the built-in DNS
4820 server in ADSL modems/routers). There is a once-per-process timeout
4821 in case of a broken server. To avoid it, users can run nscd or put
4822 'options single-request' in /etc/resolv.conf.
4823 Implemented by Ulrich Drepper.
4827 * The following bugs are resolved with this release:
4829 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
4830 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
4831 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
4832 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
4833 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
4835 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4836 up at the same time. Implemented by Ulrich Drepper.
4838 * TLS descriptors for LD and GD on x86 and x86-64.
4839 Implemented by Alexandre Oliva.
4841 * getaddrinfo now handles DCCP and UDPlite.
4842 Implemented by Ulrich Drepper.
4844 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4845 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4846 Implemented by Ulrich Drepper.
4848 * New implementation of memmem, strstr, and strcasestr which is O(n).
4849 Implemented by Eric Blake.
4851 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4853 * Implement "e" option for popen to open file descriptor with the
4854 close-on-exec flag set. Implemented by Ulrich Drepper.
4856 * Implement "b" mode for fmemopen. In this mode writes writes don't
4857 implicitly add a NUL byte and seeks from the end of the buffer really
4858 use the buffer end, not the string length as the basis.
4859 Implemented by Ulrich Drepper.
4861 * Many functions, exported and internal, now atomically set the close-on-exec
4862 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4864 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4866 Implemented by Pravin Satpute.
4868 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4872 * The following bugs are resolved with this release:
4874 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4875 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4876 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4877 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4878 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4879 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4880 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4882 * New locales: bo_CN, bo_IN, shs_CA.
4884 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4886 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4887 Implemented by Pravin Satpute.
4889 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4891 * nscd caches now all timeouts for DNS entries
4892 Implemented by Ulrich Drepper.
4894 * nscd is more efficient and wakes up less often.
4895 Implemented by Ulrich Drepper.
4897 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4898 vdprintf, and obstack_vprintf.
4899 Implemented by Jakub Jelinek.
4901 * Faster memset for x86-64.
4902 Implemented by Harsha Jagasia and H.J. Lu.
4904 * Faster memcpy on x86.
4905 Implemented by Ulrich Drepper.
4907 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4908 Implemented by Ulrich Drepper.
4910 * Faster sqrt and sqrtf implemention for some PPC variants.
4911 Implemented by Steven Munroe.
4915 * The following bugs are resolved with this release:
4917 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4918 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4919 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4920 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4921 5071, 5103, 5104, 5112, 5113, 5184, 5186
4923 * More checking functions: fread, fread_unlocked, open*, mq_open.
4924 Implemented by Jakub Jelinek and Ulrich Drepper.
4926 * Extend fortification to C++. Implemented by Jakub Jelinek.
4928 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4929 by not recognizing 'a' as a modifier when those specs are requested.
4930 Implemented by Jakub Jelinek.
4932 * PPC optimizations to math and string functions.
4933 Implemented by Steven Munroe.
4935 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4936 options to be passed. Implemented by Ulrich Drepper.
4938 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4940 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4941 Implemented by Ulrich Drepper.
4943 * Handle private futexes in the NPTL implementation.
4944 Implemented by Jakub Jelinek and Ulrich Drepper.
4946 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4947 Implemented by Roland McGrath and Ulrich Drepper.
4949 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4951 * SHA-256 and SHA-512 based password encryption.
4952 Implemented by Ulrich Drepper.
4954 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4955 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4958 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4959 Implemented by Ulrich Drepper.
4963 * The following bugs are resolved with this release:
4965 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4966 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4967 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4968 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4969 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4970 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4971 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4974 * New Linux interfaces: epoll_pwait, sched_getcpu.
4976 * New generic interfaces: strerror_l.
4978 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4982 * The following bugs are resolved with this release:
4984 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4985 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4986 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4987 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4988 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4989 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4990 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4991 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4992 3225, 3251, 3252, 3253, 3273
4994 * For Linux, the sorting of addresses returned by getaddrinfo now also
4995 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4996 Implemented by Ulrich Drepper.
4998 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4999 Implemented by Ulrich Drepper.
5001 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5003 * New iconv module for MIK. Contributed by Alexander Shopov.
5005 * For sites with broken group and/or passwd database, the auto-propagate
5006 option of nscd can prevent creating ID lookup entries from the results
5007 of a name lookup and vice versa. This usually is no problem but some
5008 site might have problems with the default behavior.
5009 Implemented by Ulrich Drepper.
5011 * Iterating over entire database in NIS can be slow. With the
5012 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5013 to trade time for memory. The entire database will be read at once.
5014 Implemented by Ulrich Drepper.
5016 * The interfaces introduced in RFC 3542 have been implemented by
5019 * Support for the new ELF hash table format was added by Ulrich Drepper.
5021 * Support for priority inheritance mutexes added by Jakub Jelinek and
5024 * Support for priority protected mutexes added by Jakub Jelinek.
5026 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5027 or_IN, csb_PL, fy_NL, sr_ME.
5031 * More overflow detection functions.
5033 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5034 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5036 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5037 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5038 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5039 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5040 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5041 by Masahide Washizawa.
5043 * It is now possible to install audit libraries for the dynamic linker using
5044 LD_AUDIT. Implemented by Ulrich Drepper.
5046 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5047 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5048 For a libc and libpthread that works well on Linux 2.4 kernels, we
5049 recommend using the stable 2.3 branch.
5051 * The new function open_wmemstream acts like open_memstream,
5052 but uses a wchar_t wide character buffer.
5054 * The new function ppoll is an improved version of poll, similar to pselect.
5056 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5057 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5058 renameat, unlinkat, linkat, symlinkat, readlinkat.
5060 * New Linux kernel system calls: unshare,
5061 inotify_init, inotify_add_watch, inotify_rm_watch.
5063 * The euidaccess function is now also known by the alias eaccess,
5064 for compatibility with some other systems.
5066 * Timezone data updated to 2006b version.
5070 * The following bugs are resolved with this release:
5072 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5073 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5074 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5075 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5076 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5077 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5079 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5081 * As of this release, GCC 4 can be used to compile the C Library.
5083 * Timezone data updated to 2005m version.
5087 * The following bugs are resolved with this release:
5089 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5090 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5091 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5092 777, 787, 821, 822, 823, 825
5094 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5098 * Support for RFC 3678. Real implementations exist only for Linux so far.
5099 Implemented by Ulrich Drepper.
5101 * nscd can now cache entries persistently. Expiring entries are reloaded.
5102 For speedups the cache can be shared in memory with client processes.
5103 Implemented by Ulrich Drepper.
5105 * nscd can now perform SELinux checks.
5106 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5108 * getaddrinfo queries are now cached. Canonical name lookup is performed
5110 Implemented by Ulrich Drepper.
5112 * The nothrow function attribute is used when headers are used by gcc when
5113 compiling C code. This can avoid significant amounts of exception
5116 * The malloc functions perform more error checking and are stricter when
5117 it comes to reacting on errors. The default action is to terminate
5118 the process after showing an error message. Implemented by Ulrich Drepper.
5120 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5121 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5123 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5124 namespaces using the new function dlmopen(). This feature is of course,
5125 like most other dynamic loading functionality, not available in statically
5126 linked applications. Implemented by Ulrich Drepper.
5128 * Low-overhead boundary checking variants of string and some stdio functions
5129 were added. These are to be used in conjunction with a gcc patch by
5130 Jakub Jelinek which adds calls to these functions if possible.
5131 Implemented by Jakub Jelinek and Ulrich Drepper.
5133 * Old code for several operating systems and machine architectures that
5134 have not been in working condition in a long time have been removed from
5135 the main source tree maintained by the GNU C Library's maintainers.
5136 These files are now reside in the separate `ports' source module
5137 that is usable as an add-on when building the library.
5141 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5142 interrogate the dynamic linker, compatible with the Solaris interface.
5144 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5145 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5147 * getifaddrs now uses the netlink interface on Linux to get its information.
5148 Implemented by Thorsten Kukuk.
5150 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5151 Implemented by Ulrich Drepper.
5153 * support for non-executable stacks on x86 has been added. Changes mostly
5156 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5159 * getaddrinfo now performs destination address selection according to
5164 * Thread-safe interfaces for many functions that access locale data
5165 were added in version 2.3, but these features were omitted from NEWS.
5166 Many functions have variants with an `_l' suffix that take a `locale_t'
5167 object as a parameter rather than consulting the current locale.
5168 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5169 create and maintain `locale_t' objects. Additionally, the new function
5170 `uselocale' sets "the current locale" (as used by functions not so
5171 parameterized) set for an individual thread. These features were added
5172 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5174 * The functions getresuid, getresgid, setresuid, and setresgid, which
5175 have long been available on Linux, are now declared in <unistd.h>
5176 and are now also available on the Hurd.
5178 * ELF thread-local storage support (TLS) now works on x86-64.
5180 * The new dynamic string token $LIB is expanded in shared library names.
5181 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5183 * Aldy Hernandez contributed complete software floating point support for
5184 PowerPC machines with no FPU.
5186 * fexecve is implemented on Linux.
5188 * The `btowc' function should work at least twice as fast due to
5189 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5191 * With approriate thread add-ons cancelable functions are now implemented
5192 in libc.so as well. No need to call the function in libpthread. This
5193 change allowed to finally disable the incorrect and expensive handling
5194 of weak definition in ld.so.
5196 * Yet more PLT entries in libc.so have been removed. We finally arrived
5197 at the bare minimum. Startup times improved appropriately.
5199 * Support for the new Linux/x86 system call interface was added. The
5200 AT_SYSINFO auxiliary vector entry is recognized and handled.
5204 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5207 * iconv (the program and the interface) now accepts empty names (excluding
5208 options like //TRANSLIT) to mean "use charset of current locale".
5210 * localedef can now transliterate characters in strings which are not in
5211 the provided charmap. The information from the input locale is used.
5213 * Prelinking support was added for ELF targets. This requires additional
5214 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5216 * Read-only stdio streams now use mmap to speed up operation by eliminating
5217 copying and buffer underflows. To use add 'm' to the mode string of
5218 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5220 * The malloc functions were completely rewritten by Wolfram Gloger based
5221 on Doug Lea's malloc-2.7.0.c.
5223 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5224 implementation of regex.
5226 * Bruno Haible upgraded the iconv and locale implementation to support
5229 * Contents of the LC_* and LANG environment variables in the CEN style are
5230 not recognized anymore. It never was used. Change by Ulrich Drepper.
5232 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5233 thread-local storage (TLS) ABI on some platforms.
5234 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5236 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5237 EUC-JISX0213, and TSCII.
5239 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5240 BSD-compatible interface for getting all network interface addresses.
5241 Implementation for IPv4 by Roland McGrath.
5243 * Loading of locale data is faster due to the introduction of a locale
5244 archive. Implemented by Roland McGrath and Ulrich Drepper.
5246 * Startup times are significantly reduced by not using exported functions
5247 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5250 * Steven Munroe contributed a port to PowerPC64/Linux.
5254 * The Hurd now uses the GNU libio implementation of stdio rather than the
5255 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5257 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5258 with the same behavior as the Linux system call of the same name.
5262 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5263 128-bit long double format.
5265 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5266 IBM1161, and IBM1162 charsets.
5268 * Andreas Jaeger contributed a port to x86-64/Linux.
5270 * Peter Bruin contributed a port to PowerPC/Hurd.
5272 * libc functions using I/O streams now can handle wide-oriented streams
5275 * optimizations in the dynamic linker. Binaries created by recent binutils
5276 versions start up quicker due to reduced time spent on relocations.
5278 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5282 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5283 asinh, atanh, j0 for the 128-bit long double format.
5285 * Bruno Haible updated all the code handling Unicode in some form to
5286 support Unicode 3.1.
5288 * Speed of regex for single-byte locales is back to previous levels.
5289 Patch by Isamu Hasegawa.
5291 * Alpha, SPARC, and IA-64 now also using floating stacks.
5293 * Startup time of internationalized applications greatly improved through
5294 iconv cache. Use iconvconfig to generate the cache file.
5295 Contributed by Ulrich Drepper.
5297 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5298 severe performance problems. Patch by David Mosberger.
5300 * The Hurd port got a lot more functionality like AIO, various stdio
5301 extensions, etc. Mainly done by Roland McGrath.
5303 * mtrace can now lookup symbols in shared libraries.
5307 * Intel's IA-64 math library is largely integrated. It provides fast and
5308 accurate implementatations for most basic and standard math functions
5309 in float, double, and long double format.
5311 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5312 and asin for the 96-bit long double format and asin, log, tan for the
5313 128-bit long double format.
5315 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5316 The basic double functions exist today. Contributed by Abraham Ziv
5317 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5318 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5320 * An asynchronous name lookup library was added. The interface is designed
5321 after POSIX AIO. The proposal was circulated beforehand to get comments.
5322 No negative ones came in. Implemented by Ulrich Drepper.
5324 * Port to S390/64bit contributed by Martin Schwidefsky
5325 <schwidefsky@de.ibm.com>.
5327 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5328 of functions for Linux/IA-64.
5330 * The RPC code is now thread safe. Threads can now use the same service
5331 of different services at the same time. Patch by Eric Norum
5332 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5334 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5335 family of functions for Linux/S390.
5337 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5338 of functions for Linux/x86.
5340 * Port to Linux/CRIS contributed by Axis Communications.
5344 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5345 we can now check for namespace violations and missing declarations. The
5346 result is that almost all headers are now Unix-compliant (as defined in
5347 the upcoming XPG6). The negative side is that some programs might need
5348 corrections, too, if they depend on the incorrect form of the headers in
5349 previous versions which defined too many symbols and included too many
5352 * regex now handles multibyte character sets correctly.
5353 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5355 * iconv (the program) does now conform to the upcoming XPG6 and handles
5356 charmaps. Instead of the charset names the path of charmaps can be
5357 provided and the conversion happens based on this data.
5358 Contributed by Ulrich Drepper.
5360 * The locale program now provides detailed information about the installed
5365 only lists the names of the supported locales
5369 provides details such as country, language, and codeset name.
5370 Contributed by Ulrich Drepper.
5374 * The gencat program now parses the input file according to the charset
5375 selected by the LC_CTYPE category. This is important for stateful
5376 character sets. To make generating catalogs easier there is a way
5377 to overwrite the charset selected by the locale: before the first
5378 message or $ quote line the catalog can contain a line like
5380 $ codeset=ISO-8859-2
5382 to select the charset (ISO-8859-2 in this case).
5384 Implemented by Shinya Hanataka and Ulrich Drepper.
5386 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5387 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5388 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5390 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5391 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5393 * The LANGUAGE environment variable is now ignored unless the locale is
5394 changed from the default "C" locale.
5396 * The usual bug fixes.
5400 * Greg McGary added runtime support for bounds checking using gcc's
5401 new -fbounded-pointers option. ix86 target is complete. PowerPC
5404 * Thorsten Kukuk added secure mode support to nscd.
5406 * The Berkeley db libraries have been removed.
5408 Related, the nss_db module is now in a separate package since it
5409 obviously requires a database library being available.
5411 * Wide character I/O streams implemented by Ulrich Drepper.
5413 * Functions from the extended socket API added by Ulrich Drepper.
5415 * Functions feenableexcept and fedisableexcept to control the
5416 behaviour of individual exceptions have been added by Andreas Jaeger.
5418 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5420 * The resolver code has been updated from bind 8.2.3-T5B which supports
5421 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5424 This change could in some situations effect backward compatibility. Since
5425 now `_res' is a thread-local instead of a global variable, modifying it
5426 in one thread does not have any effect in other threads.
5428 The resolver library was also extended to allow IPv6 as the transport
5429 protocol for the requests. This work was done by Stig Venaas.
5431 * Compatibility code for K&R C compilers has been removed from the
5432 header files. A ISO C compiler is needed to use the library
5433 (conforming to either C89 or C99 standard).
5435 * Complete rewrite of the localedef program to support multibyte character
5436 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5437 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5438 Implemented by Ulrich Drepper.
5440 Bruno Haible significantly improved the generation and use of the data
5441 structures for the wide character tables.
5443 * Plural handling in gettext implemented by Ulrich Drepper.
5445 * The utmp daemon has been removed.
5447 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5449 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5452 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5454 * POSIX barriers implemented by Kaz Kylheku.
5456 * POSIX spawn function family implemented by Ulrich Drepper.
5458 * POSIX spinlocks are now available.
5460 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5462 * the configure option --enable-kernel=X.Y.Z allows to strip out
5463 compatibility for kernel versions before X.Y.Z. This is currently only
5464 implemented for Linux.
5466 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5467 field sin6_scope_id. This means that all programs using IPv6 should be
5468 recompiled. Don't expect binary compatibility with previous glibc
5471 * various conversion modules for IBM character sets contributed by
5474 * IA-64 port by Jes Sorensen and HJ Lu.
5488 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5490 * New xdr functions are added; some rpc functions are now 64bit clean.
5492 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5494 * Fixed known incompatibilities with glibc 2.0.
5496 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5498 * Optimized a number of functions (especially the ELF dynamic loader).
5500 * Update timezone data files.
5502 * lots of charmaps corrections
5504 * some new locale definitions and charmaps
5509 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5510 conform to POSIX member type requirements. Symbol versions have been
5511 adjusted as needed within the library, and for direct use by applications,
5512 but there is potential for problems if third-party libraries use
5513 struct timeval as part of their interface. This does not present
5514 a problem for X and other "essential" system libraries.
5516 * An additional locale model to support C++ Standard Library locale
5517 model and probably more was implemented by Ulrich Drepper.
5519 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5522 * Miles Bader provided the `argp' function family to support hierachical
5523 command line argument parsing, layered on top of getopt.
5525 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5527 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5530 * scanf recognizes the %a and %A format for scanning floating point numbers.
5532 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5533 information and interfaces for the available integer types.
5535 * about 130 new math functions were added to implement the ISO C9x math
5538 * the new header <complex.h> contains definitions of the complex math
5539 functions from ISO C 9X.
5541 * the new header <tgmath.h> defines generic macros to use complex or
5542 real valued functions.
5544 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5546 * Andreas Jaeger provided a test suite for the math library.
5548 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5550 * Ulrich Drepper added character set conversion functions (iconv).
5552 * Optimized string functions have been added.
5554 * The localedata addon is now part of glibc.
5556 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5558 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5559 daemon for NSS (nscd).
5561 Missing a better place here are some numbers on improvements. Under
5562 Linux 2.1.125 un-tar-ing the kernel sources takes
5566 using local files 12.19s 6.88s 22.91s
5568 using NIS 13.92s 8.91s 26.34s
5570 using NIS & nscd 10.37s 7.34s 25.30s
5572 using NIS+ 27.57s 30.37s 640.46s
5574 using NIS+ & nscd 10.25s 7.83s 26.51s
5576 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5578 Keep in mind that non-namelookup related operations dominate above times.
5579 It was just a common complain that using NIS+ unpacking the kernel is
5582 [1] The old nscd implementation is not available anymore since it was
5583 distributed with glibc up to version 2.0.98 and thus is now replaced.
5585 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5587 * Mark Kettenis provided a Hesiod NSS module.
5589 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5590 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5592 * rcmd can now handle netgroups (Dick Streefland).
5594 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5597 * Support for the IPv6 protocol has been added to the socket API, as per the
5598 latest draft standards.
5600 * Support for Linux 2.2 has been added.
5602 * Interface changes relative to the latest 2.0.x release:
5603 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5604 addseverity NEW: Unix98
5605 alphasort64 NEW: LFS
5606 argp_err_exit_status NEW: argp, GNU ext
5607 argp_error NEW: argp, GNU ext
5608 argp_failure NEW: argp, GNU ext
5609 argp_help NEW: argp, GNU ext
5610 argp_parse NEW: argp, GNU ext
5611 argp_program_bug_address NEW: argp, GNU ext
5612 argp_program_version NEW: argp, GNU ext
5613 argp_program_version_hook NEW: argp, GNU ext
5614 argp_state_help NEW: argp, GNU ext
5615 argp_usage NEW: argp, GNU ext
5616 authdes_create NEW: Secure RPC
5617 authdes_getucred NEW: Secure RPC
5618 authdes_pk_create NEW: Secure RPC
5619 backtrace NEW: GNU ext.
5620 backtrace_symbols NEW: GNU ext.
5621 backtrace_symbols_fd NEW: GNU ext.
5623 cacosf NEW: ISO C 9x
5624 cacosh NEW: ISO C 9x
5625 cacoshf NEW: ISO C 9x
5626 cacoshl NEW: ISO C 9x
5627 cacosl NEW: ISO C 9x
5634 casinf NEW: ISO C 9x
5635 casinh NEW: ISO C 9x
5636 casinhf NEW: ISO C 9x
5637 casinhl NEW: ISO C 9x
5638 casinl NEW: ISO C 9x
5640 catanf NEW: ISO C 9x
5641 catanh NEW: ISO C 9x
5642 catanhf NEW: ISO C 9x
5643 catanhl NEW: ISO C 9x
5644 catanl NEW: ISO C 9x
5645 cbc_crypt NEW: Secure RPC
5649 ccoshf NEW: ISO C 9x
5650 ccoshl NEW: ISO C 9x
5656 cimagf NEW: ISO C 9x
5657 cimagl NEW: ISO C 9x
5658 clearerr_locked REMOVED
5659 clntunix_create NEW: sunrpc ext
5661 clog10 NEW: ISO C 9x
5662 clog10f NEW: ISO C 9x
5663 clog10l NEW: ISO C 9x
5673 cprojf NEW: ISO C 9x
5674 cprojl NEW: ISO C 9x
5676 crealf NEW: ISO C 9x
5677 creall NEW: ISO C 9x
5682 csinhf NEW: ISO C 9x
5683 csinhl NEW: ISO C 9x
5686 csqrtf NEW: ISO C 9x
5687 csqrtl NEW: ISO C 9x
5691 ctanhf NEW: ISO C 9x
5692 ctanhl NEW: ISO C 9x
5694 des_setparity NEW: Secure RPC
5695 ecb_crypt NEW: Secure RPC
5696 endutxent NEW: Unix98
5698 exp10f NEW: ISO C 9x
5699 exp10l NEW: ISO C 9x
5703 fattach NEW: STREAMS
5704 fdetach NEW: STREAMS
5708 feclearexcept NEW: ISO C 9x
5709 fegetenv NEW: ISO C 9x
5710 fegetexceptflag NEW: ISO C 9x
5711 fegetround NEW: ISO C 9x
5712 feholdexcept NEW: ISO C 9x
5714 feraiseexcept NEW: ISO C 9x
5715 ferror_locked REMOVED
5716 fesetenv NEW: ISO C 9x
5717 fesetexceptflag NEW: ISO C 9x
5718 fesetround NEW: ISO C 9x
5719 fetestexcept NEW: ISO C 9x
5720 feupdateenv NEW: ISO C 9x
5721 fflush_locked REMOVED
5725 fgets_unlocked NEW: GNU ext.
5726 fileno_locked REMOVED
5738 fputc_locked REMOVED
5739 fputs_unlocked NEW: GNU ext.
5740 fread_unlocked NEW: GNU ext.
5745 fstatvfs NEW: Unix98
5749 ftruncate64 NEW: LFS
5751 fwrite_unlocked NEW: GNU ext.
5752 gai_strerror NEW: IPv6
5756 getchar_locked REMOVED
5758 getdate_err NEW: Unix98
5759 getdate_r NEW: GNU ext.
5761 getnameinfo NEW: IPv6
5762 getnetname NEW: Secure RPC
5763 getpmsg NEW: STREAMS
5764 getpt NEW: Unix98 PTY
5765 getrlimit64 NEW: LFS
5766 getutxent NEW: Unix98
5767 getutxid NEW: Unix98
5768 getutxline NEW: Unix98
5769 glob64 NEW: GNU ext.
5770 globfree64 NEW: GNU ext.
5771 gnu_get_libc_release NEW: GNU ext.
5772 gnu_get_libc_version NEW: GNU ext.
5773 grantpt NEW: Unix98 PTY
5774 host2netname NEW: Secure RPC
5776 iconv_close NEW: iconv
5777 iconv_open NEW: iconv
5778 if_freenameindex NEW: IPv6
5779 if_indextoname NEW: IPv6
5780 if_nameindex NEW: IPv6
5781 if_nametoindex NEW: IPv6
5782 in6addr_any NEW: IPv6
5783 in6addr_loopback NEW: IPv6
5784 inet6_isipv4mapped NEW: IPv6
5785 isastream NEW: STREAMS
5786 iswblank NEW: GNU ext.
5787 key_decryptsession NEW: Secure RPC
5788 key_decryptsession_pk NEW: Secure RPC
5789 key_encryptsession NEW: Secure RPC
5790 key_encryptsession_pk NEW: Secure RPC
5791 key_gendes NEW: Secure RPC
5792 key_get_conv NEW: Secure RPC
5793 key_secretkey_is_set NEW: Secure RPC
5794 key_setnet NEW: Secure RPC
5795 key_setsecret NEW: Secure RPC
5796 llrint NEW: ISO C 9x
5797 llrintf NEW: ISO C 9x
5798 llrintl NEW: ISO C 9x
5799 llround NEW: ISO C 9x
5800 llroundf NEW: ISO C 9x
5801 llroundl NEW: ISO C 9x
5806 lrintf NEW: ISO C 9x
5807 lrintl NEW: ISO C 9x
5808 lround NEW: ISO C 9x
5809 lroundf NEW: ISO C 9x
5810 lroundl NEW: ISO C 9x
5812 makecontext NEW: Unix98
5813 mempcpy NEW: GNU ext.
5816 modify_ldt NEW: kernel
5820 nearbyint NEW: ISO C 9x
5821 nearbyintf NEW: ISO C 9x
5822 nearbyintl NEW: ISO C 9x
5823 netname2host NEW: Secure RPC
5824 netname2user NEW: Secure RPC
5825 nexttoward NEW: ISO C 9x
5826 nexttowardf NEW: ISO C 9x
5827 nexttowardl NEW: ISO C 9x
5831 passwd2des NEW: Secure RPC
5833 pow10f NEW: GNU ext.
5834 pow10l NEW: GNU ext.
5837 printf_size NEW: GNU ext.
5838 printf_size_info NEW: GNU ext.
5839 profil_counter REMOVED
5840 pthread_mutexattr_getkind_np REPLACED
5841 pthread_mutexattr_setkind_np REPLACED
5842 ptsname NEW: Unix98 PTY
5843 ptsname_r NEW: Unix98 PTY
5845 putchar_locked REMOVED
5846 putgrent NEW: GNU ext.
5848 putpmsg NEW: STREAMS
5849 pututxline NEW: Unix98
5853 readdir64_r NEW: LFS
5854 remquo NEW: ISO C 9x
5855 remquof NEW: ISO C 9x
5856 remquol NEW: ISO C 9x
5858 roundf NEW: ISO C 9x
5859 roundl NEW: ISO C 9x
5861 scalbln NEW: ISO C 9x
5862 scalblnf NEW: ISO C 9x
5863 scalblnl NEW: ISO C 9x
5865 sendfile NEW: kernel
5866 setcontext NEW: Unix98
5867 setrlimit64 NEW: LFS
5868 setutxent NEW: Unix98
5870 sigignore NEW: Unix98
5871 sigqueue NEW: POSIX.1b
5872 sigrelse NEW: Unix98
5873 sigset NEW: POSIX.1b
5874 sigtimedwait NEW: POSIX.1b
5875 sigwaitinfo NEW: POSIX.1b
5876 sincos NEW: GNU ext.
5877 sincosf NEW: GNU ext.
5878 sincosl NEW: GNU ext.
5882 strcasestr NEW: GNU ext.
5883 strtoimax NEW: ISO C 9x
5884 strtoumax NEW: ISO C 9x
5885 strverscmp NEW: GNU ext.
5886 svcauthdes_stats NEW: Secure RPC
5887 svcunix_create NEW: sunrpc etx
5888 svcunixfd_create NEW: sunrpc ext
5889 swapcontext NEW: Unix98
5890 tcgetsid NEW: Unix98 PTY
5891 tdestroy NEW: GNU ext.
5892 tgamma NEW: ISO C 9x
5893 tgammaf NEW: ISO C 9x
5894 tgammal NEW: ISO C 9x
5898 truncf NEW: ISO C 9x
5899 truncl NEW: ISO C 9x
5901 unlockpt NEW: Unix98 PTY
5902 updwtmpx NEW: Unix98
5903 user2netname NEW: Secure RPC
5904 utmpxname NEW: Unix98
5905 versionsort NEW: GNU ext.
5906 versionsort64 NEW: GNU ext.
5908 wcscasecmp NEW: GNU ext.
5909 wcsncasecmp NEW: GNU ext.
5910 wcsnlen NEW: GNU ext.
5911 wcstoimax NEW: ISO C 9x
5912 wcstoll NEW: ISO C 9x
5913 wcstoull NEW: ISO C 9x
5914 wcstoumax NEW: ISO C 9x
5916 wordexp NEW: POSIX.2
5917 wordfree NEW: POSIX.2
5918 write_profiling REMOVED
5919 xdecrypt NEW: Secure RPC
5920 xdr_authdes_cred NEW: Secure RPC
5921 xdr_authdes_verf NEW: Secure RPC
5922 xdr_cryptkeyarg NEW: Secure RPC
5923 xdr_cryptkeyarg2 NEW: Secure RPC
5924 xdr_cryptkeyres NEW: Secure RPC
5925 xdr_getcredres NEW: Secure RPC
5926 xdr_key_netstarg NEW: Secure RPC
5927 xdr_key_netstres NEW: Secure RPC
5928 xdr_keybuf NEW: Secure RPC
5929 xdr_keystatus NEW: Secure RPC
5930 xdr_netnamestr NEW: Secure RPC
5931 xdr_sizeof NEW: Secure RPC
5932 xdr_unixcred NEW: sunrpc ext
5933 xencrypt NEW: Secure RPC
5934 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5945 * inet_ntoa is thread-safe
5947 * updwtmp is moved from libutil to libc
5949 * rewrite of cbrt function
5951 * update of timezone data
5965 * add atoll function
5967 * fix complex problems in Berkeley DB code
5969 * fix math functions
5973 * fixed lots of header problems (especially Linux/GNU specific)
5975 * dynamic loader preserves all registers
5977 * Roland McGrath provided support for handling of auxiliary objects in
5978 the ELF dynamic loader.
5980 * support for parallel builds is improved
5984 * GNU extensions are no longer declared by default. To enable them you
5985 must define the macro `_GNU_SOURCE' in your program or compile with
5988 * The library has changed from using GNU ld symbol aliases to using weak
5989 symbols where available. The ELF object file format supports weak
5990 symbols; GNU ld also supports weak symbols in the a.out format. (There
5991 is also now support for other GNU ld extensions in ELF. Use the
5992 `--with-elf' option to configure to indicate you have ELF, and
5993 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5994 of many files which contained only symbol aliases, reducing the size of
5995 the source and the compiled library; many other files were renamed to
5996 less cryptic names previously occupied by the symbol alias files.
5997 There is a new header file <elf.h> for programs which operate on
5998 files in the ELF format.
6000 * Converted to Autoconf version 2, so `configure' has more options.
6001 Run `configure --help' to see the details.
6003 * The library can now be configured to build profiling, highly-optimized
6004 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6005 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6006 `configure' enable building these extra libraries. The shared library is
6007 built by default when using both ELF and GNU ld. When shared libraries
6008 are enabled, the new library `-ldl' is available for arbitrary run-time
6009 loading of shared objects; its interface is defined in <dlfcn.h>. The
6010 new header file <link.h> gives access to the internals of the run-time
6011 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6012 application of same name on other systems and it provides information
6013 about dynamically linked binaries.
6015 * The C library now provides the run-time support code for profiling
6016 executables compiled with `-pg'. Programs can control the profiling code
6017 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6018 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6019 the support for this file format was contributed by David Mosberger-Tang.
6021 * The math code has been replaced with a math library based on fdlibm from
6022 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6023 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6024 functions. The math functions now reside in a separate library, so
6025 programs using them will need to use `-lm' their linking commands.
6027 * John C. Bowman contributed optimized ix87 assembler inline functions.
6029 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6030 mechanism similar to that found in Solaris 2. This is now used for the
6031 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6032 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6033 file controls what services are used for each individual database. This
6034 works by loading shared libraries with names specified in `nsswitch.conf',
6035 so service modules can be changed or added at any time without even
6036 relinking any program. Currently there are the file, db, and NIS based
6037 NSS services available.
6039 * The new functions `strtoq' and `strtouq' parse integer values from
6040 strings, like `strtol' and `strtoul', but they return `long long int' and
6041 `unsigned long long int' values, respectively (64-bit quantities).
6043 * The new functions `strtof' and `strtold' parse floating-point values from
6044 strings, like `strtod', but they return `float' and `long double' values,
6045 respectively (on some machines `double' and `long double' are the same).
6047 * Ulrich Drepper has contributed new implementations of the floating-point
6048 printing and reading code used in the `printf' family of functions and
6049 `strtod', `strtof', and `strtold'. These new functions are perfectly
6050 accurate, and much faster than the old ones.
6052 * The implementation of the POSIX locale model was completely rewritten by
6053 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6054 to compile the POSIX locale definition.
6056 * The former dummy implementations of the strcoll and strxfrm function are
6057 now replaced by fully functional code contributed by Ulrich Drepper. The
6058 collation information comes from the POSIX locale definitions.
6060 * The new header <langinfo.h> defines an interface for accessing
6061 various locale-dependent data (using the locale chosen with `setlocale').
6063 * Ulrich Drepper has contributed a new suite of functions for operation on
6064 wide-character and multibyte-character strings, in <wchar.h>;
6065 and classification and case conversion of wide characters, in <wctype.h>.
6066 These new functions are conforming to the ISO C, Amendement 1 specification.
6068 * There is now a second implementation of the standard I/O library available.
6069 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6070 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6072 * You can now use positional parameter specifications in format strings
6073 for the `printf' and `scanf' families of functions. For example,
6074 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6075 ``Number 6, Mr Jones''. This is mainly useful when providing different
6076 format strings for different languages, whose grammars may dictate
6077 different orderings of the values being printed. To support this
6078 feature, the interface for `register_printf_handler' has changed; see
6079 the header file <printf.h> for details.
6081 * The `printf' and `scanf' families of functions now understand a new
6082 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6083 to group numbers as indicated by the locale; for `scanf' and friends, this
6084 says to accept as valid only a number with all the proper grouping
6085 separators in the right places. In the default "C" locale, numbers are
6086 not grouped; but locales for specific countries will define the usual
6087 conventions (i.e. separate thousands with `,' in the US locale).
6089 * The pgrp functions have been regularized, slightly incompatibly but much
6090 less confusingly. The core functions are now `getpgid' and `setpgid',
6091 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6092 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6093 provided for compatibility. There is no longer an incompatible `getpgrp'
6094 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6096 * The new header file <fts.h> and suite of functions simplify programs that
6097 operate on directory trees. This code comes from 4.4 BSD.
6099 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6100 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6101 NSS scheme used in glibc.
6103 * There is a new malloc debugging hook `__memalign_hook'.
6105 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6106 `unsigned int' in <sys/types.h>. These are for compatibility only and
6107 their use is discouraged.
6109 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6110 done differently, so that it works even without GNU ld.
6112 * New function `euidaccess' checks allowed access to a file like `access',
6113 but using the effective IDs instead of the real IDs.
6115 * The time zone data files have been updated for the latest and greatest
6116 local time conventions of the countries of the world.
6118 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6121 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6122 for formatting floating-point numbers. They are provided only for
6123 compatibility; new programs should use `sprintf' instead. There are
6124 also equivalent function for the `long double' floating-point type and
6125 all functions also exist in a reentrant form.
6127 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6128 functions for maintaining the login-record files (primarily of use to
6129 system programs such as `login'), and convenient functions for
6130 allocating and initializing a pseudo-terminal (pty) device.
6132 * Ulrich Drepper has contributed new support for System V style
6133 shared memory and IPC on systems that support it.
6135 * Ulrich Drepper has contributed several miscellaneous new functions found
6136 in System V: The `hsearch' family of functions provide an effective
6137 implementation of hash tables; `a64l' and `l64a' provide a very simple
6138 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6141 * Ulrich Drepper has contributed new reentrant counterparts for the
6142 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6144 * Ulrich Drepper has contributed new, highly-optimized versions of several
6145 string functions for the i486/Pentium family of processors.
6147 * Ulrich Drepper has updated the Linux-specific code, based largely
6148 on work done in Hongjiu Lu's version of GNU libc for Linux.
6149 The GNU library now supports Linux versions 2.0.10 and later,
6150 using the ELF object file format (i[3456]86-*-linux).
6152 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6154 * David Mosberger-Tang and Richard Henderson have ported the C library
6155 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6156 dynamic linking support for ELF/Alpha.
6158 * Richard Henderson contributed several Alpha optimized assembler function
6159 for arithmetic and string handling.
6161 * Ulrich Drepper has contributed a new set of message catalog functions to
6162 support multiple languages using the <libintl.h> interface, for use with
6163 his new package GNU gettext. Translation volunteers have contributed
6164 catalogs of the library's messages in Spanish, German, and Korean.
6166 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6167 program and the `catgets' function for reading the catalog files it
6168 creates. (The <libintl.h> interface is preferred; we include the
6169 <nl_types.h> interface using `catgets' only for source compatibility with
6170 programs already written to use it.)
6172 * New header file <values.h> gives SVID-compatible names for <limits.h>
6175 * Various new macros, declarations, and small header files for compatibility
6178 * New function `group_member' is a convenient way to check if a process has
6179 a given effective group ID.
6181 * When using GCC 2.7 and later, the socket functions are now declared in a
6182 special way so that passing an argument of type `struct sockaddr_in *',
6183 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6184 `struct sockaddr *' type, does not generate a type-clash warning.
6186 * New function `error' declared in header file <error.h> is a convenient
6187 function for printing error messages and optionally exiting; this is the
6188 canonical function used in GNU programs. The new functions `err', `warn',
6189 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6190 doing the same thing.
6192 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6193 POSIX.2 `glob' function to do ~ and {...} expansion.
6195 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6196 `clearenv' which is used in POSIX.9 is also available.
6198 * New function `getsid' returns session ID number on systems that support it.
6200 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6201 files <db.h> and <mpool.h> provide a rich set of functions for several
6202 types of simple databases stored in memory and in files, and <ndbm.h> is
6203 an old `ndbm'-compatible interface using the `db' functions. Link with
6204 `-ldb' to get these functions.
6206 * New macro `strdupa' copies a string like `strdup', but uses local stack
6207 space from `alloca' instead of dynamic heap space from `malloc'.
6209 * New function `strnlen' is like `strlen' but searches only a given maximum
6210 number of characters for the null terminator. `stpncpy', `strndup' and
6211 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6214 * New function `statfs' in header <sys/statfs.h>.
6216 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6217 provide convenient functions for operating on blocks of null-terminated
6220 * A new suite of functions in <utmp.h> handle all the details of reading
6221 and writing the utmp file.
6223 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6226 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6227 completely POSIX compliant and also implemented the extended functionality
6228 to handle alternate digit representation and alternate era date formats.
6230 * Ulrich Drepper provided an implementation of the `strptime' function
6231 defined in XPG4.2 which transforms a string into a `struct tm' value.
6233 * Paul Eggert provided the tzselect shell script as part of the timezone
6234 code. The shell script makes it easy to select the correct timezone
6237 * The implementation of the malloc family of functions is completely replaced
6238 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6239 The implementation uses the mmap function (if available) and it is
6240 optimized for the use in multi threaded programs.
6242 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6243 functions. This new functionality is usable by specifying a special
6244 salt string and it is compatible with implementation on *BSD systems.
6246 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6247 `getsubopt' to handle second level command line options, `bsd_signal'
6248 to access BSD style `signal' functionality, the obsolete `regexp' style
6251 * the `lchown' function is available on system which support this
6254 * The implementation of the shadow password handling function was contributed
6257 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6259 * POSIX.1g support was added. The <sys/select.h> header is available,
6260 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6261 implementation of `getaddrinfo'.
6265 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6267 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6268 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6270 * The new function `daemon' from 4.4 BSD is useful for server programs that
6271 want to put themselves in the background.
6273 * Joel Sherrill has contributed support for several standalone boards that
6274 run without an operating system.
6276 * `printf', `scanf' and friends now accept a `q' type modifier for long
6277 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6279 * All of the code taken from BSD (notably most of the math and networking
6280 routines) has been updated from the BSD 4.4-Lite release.
6282 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6284 * The new functions `getdomainname' and `setdomainname' fetch or change the
6285 YP/NIS domain name. These are system calls which exist on systems which
6288 * The time zone data files have been updated for the latest international
6291 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6292 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6296 * The C library now includes support for Sun RPC, from Sun's free
6297 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6298 are included. (There is still no support for YP.)
6300 * Tom Quinn has contributed a port of the C library to SGI machines running
6301 Irix 4 (mips-sgi-irix4).
6303 * The new `lockf' function is a simplified interface to the locking
6304 facilities of `fcntl', included for compatibility.
6306 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6308 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6310 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6313 * The error message printed by `assert' for a failed assertion now includes
6314 the name of the program (if using GNU ld) and the name of the calling
6315 function (with versions of GCC that support this).
6317 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6319 * The library now includes the <sys/mman.h> header file and memory
6320 management functions `mmap', `munmap', `mprotect', `msync', and
6321 `madvise', on systems that support those facilities.
6323 * The interface for `mcheck' has changed slightly: the function called to
6324 abort the program when an allocation inconsistency is detected now takes
6325 an argument that indicates the type of failure. The new function
6326 `mprobe' lets you request a consistency check for a particular block at
6327 any time (checks are normally done only when you call `free' or `realloc'
6330 * It is now possible to easily cross-compile the C library, building on one
6331 system a library to run on another machine and/or operating system. All
6332 you need to do is set the variable `HOST_CC' in `configparms' to the
6333 native compiler for programs to run on the machine you are building on (a
6334 few generator programs are used on Unix systems); set `CC' to the
6337 * The new function `fexecve' (only implemented on the GNU system) executes
6338 a program file given a file descriptor already open on the file.
6342 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6343 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6345 * You can set the variable `libprefix' in `configparms' to specify a prefix
6346 to be prepended to installed library files; this makes it easy to install
6347 the GNU C library to be linked as `-lgnuc' or whatever.
6349 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6350 copies a limited number of characters from a string, and returns the
6351 address of the last character written.
6353 * You no longer need to check for whether the installed `stddef.h' is
6354 compatible with the GNU C library. configure now checks for you.
6356 * You can now define a per-stream `fileno' function to convert the
6357 stream's cookie into an integral file descriptor.
6359 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6360 allocates zero bytes of storage, and returns a unique pointer which
6361 you can pass to `realloc' or `free'. The behavior is undefined if
6362 you dereference this pointer.
6364 * The C library now runs on Sony NEWS m68k machines running either
6365 NewsOS 3 or NewsOS 4.
6367 * The new `syscall' function is a system-dependent primitive function
6368 for invoking system calls. It has the canonical behavior on Unix
6369 systems, including unreliable return values for some calls (such as
6370 `pipe', `fork' and `getppid').
6372 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6373 to `EAGAIN', which is the preferred name. On systems whose kernels
6374 use two distinct codes, the C library now translates EWOULDBLOCK to
6375 EAGAIN in every system call function.
6379 * The GNU C Library Reference Manual is now distributed with the library.
6380 `make dvi' will produce a DVI file of the printed manual.
6381 `make info' will produce Info files that you can read on line using C-h i
6382 in Emacs or the `info' program.
6383 Please send comments on the manual to bug-glibc-manual@gnu.org.
6385 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6387 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6389 * Jason Merrill has contributed a port to the Sequent Symmetry running
6390 Dynix version 3 (i386-sequent-dynix).
6392 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6393 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6395 * New function `memory_warnings' lets you arrange to get warnings when
6396 malloc is running out of memory to allocate, like Emacs gives you.
6398 * The C library now contains the relocating allocator used in Emacs 19 for
6399 its editing buffers. This allocator (ralloc) minimizes allocation
6400 overhead and fragmentation by moving allocated regions around whenever it
6401 needs to. You always refer to a ralloc'd region with a "handle" (a
6402 pointer to a pointer--an object of type `void **').
6404 * There is a new `printf' format: `%m' gives you the string corresponding
6405 to the error code in `errno'.
6407 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6408 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6409 pass, the `a' modifier says to fill in a `char **' you pass with a
6412 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6413 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6414 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6416 * `mkstemp' is a traditional Unix function to atomically create and open a
6417 uniquely-named temporary file.
6421 * The standard location for the file that says what the local timezone is
6422 has changed again. It is now `/usr/local/etc/localtime' (or more
6423 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6425 * The distribution no longer contains any files with names longer than 14
6428 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6429 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6431 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6435 * The configuration process has changed quite a bit. The `configure'
6436 script is now used just like the configuration scripts for other GNU
6437 packages. The `sysdeps' directory hierarchy is much rearranged.
6438 The file `INSTALL' explains the new scheme in detail.
6440 * The header files no longer need to be processed into ANSI C and
6441 traditional C versions. There is just one set of files to install, and
6442 it will work with ANSI or old C compilers (including `gcc -traditional').
6444 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6445 MIPS DECStation running Ultrix 4.
6447 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6448 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6449 made itself into a shared library.
6451 * Yet further improved support for the i386, running 4.3 BSD-like systems
6452 (such as Mach 3 with the Unix single-server), or System V.
6454 * New function `strncasecmp' to do case-insensitive string comparison
6455 with limited length.
6457 * New function `strsep' is a reentrant alternative to `strtok'.
6459 * New functions `scandir' and `alphasort' for searching directories.
6461 * New function `setenv' is a better interface to `putenv'.
6463 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6464 function for traversing a directory tree.
6466 * The GNU obstack package is now also part of the C library.
6467 The new function `open_obstack_stream' creates a stdio stream that
6468 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6469 formatted output directly to an obstack.
6471 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6472 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6474 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6476 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6477 things to your strings.
6479 * There are some new test programs: test-fseek, testmb, and testrand.
6481 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6482 These ports are not finished, but are a good starting place for really
6483 supporting those systems.
6485 * `/etc/localtime' is now the standard location for the file that says what
6486 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6487 This follows the general principle that `/etc' is the place for all local
6488 configuration files.
6490 * The C library header files now use `extern "C"' when used by the C++
6491 compiler, so the C library should now work with C++ code.
6493 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6494 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6497 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6498 function which uses the `merge sort' algorithm, and is said to be
6499 significantly faster than the old GNU `qsort' function. Merge sort is
6500 now the standard `qsort' function. The new algorithm can require a lot
6501 of temporary storage; so, the old sorting function is called when the
6502 required storage is not available.
6504 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6505 provides the Unix `crypt' function, plus some other entry points.
6507 * The code and header files taken from 4.4 BSD have been updated with the
6508 latest files released from Berkeley.
6510 ----------------------------------------------------------------------
6513 Permission is granted to anyone to make or distribute verbatim copies
6514 of this document as received, in any medium, provided that the
6515 copyright notice and this permission notice are preserved,
6516 thus giving the recipient permission to redistribute in turn.
6518 Permission is granted to distribute modified versions
6519 of this document, or of portions of it,
6520 under the above conditions, provided also that they
6521 carry prominent notices stating who last changed them.
6524 version-control: never