1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2021 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _SC_SIGSTKSZ_SOURCE or
13 _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
14 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
15 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ).
17 * The dynamic linker implements the --list-diagnostics option, printing
18 a dump of information related to IFUNC resolver operation and
19 glibc-hwcaps subdirectory selection.
21 * On Linux, the function execveat has been added. It operates similar to
22 execve and it is is already used to implement fexecve without requiring
23 /proc to be mounted. However, different than fexecve, if the syscall is not
24 supported by the kernel an error is returned instead of trying a fallback.
26 * The ISO C2X function timespec_getres has been added.
28 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
29 C2X, is supported to enable declarations of functions defined in Annex F
30 of C2X. Those declarations are also enabled when
31 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
32 defined, and when _GNU_SOURCE is defined.
34 * On powerpc64*, glibc can now be compiled without scv support using the
35 --disable-scv configure option.
37 * Add support for 64-bit time_t on configurations like x86 where time_t
38 is traditionally 32-bit. Although time_t still defaults to 32-bit on
39 these configurations, this default may change in future versions.
40 This is enabled with the _TIME_BITS preprocessor set to 64 and only
41 supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is only
42 enabled for Linux and the full support requires a minimum version of 5.1.
44 * The main gconv-modules file in glibc now contains only a small set of
45 essential converter modules and the rest have been moved into a supplementary
46 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
47 in the same GCONV_PATH. Similarly, external converter modules directories
48 may have supplementary configuration files in a gconv-modules.d directory
49 with names ending with .conf to logically classify the converter modules in
52 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
53 to configure the size of the thread stack cache.
55 * The function _Fork has been added as an async-signal-safe fork replacement
56 since Austin Group issue 62 droped the async-signal-safe requirement for
57 fork (and it will be included in the future POSIX standard). The new _Fork
58 function does not run any atfork function neither resets any internal state
59 or lock (such as the malloc one), and only sets up a minimal state required
60 to call async-signal-safe functions (such as raise or execve). This function
61 is currently a GNU extension.
63 * On Linux, the close_range function has been added. It allows efficiently
64 closing a range of file descriptors on recent kernels (version 5.9).
66 Deprecated and removed features, and other changes affecting compatibility:
68 * The function pthread_mutex_consistent_np has been deprecated; programs
69 should use the equivalent standard function pthread_mutex_consistent
72 * The function pthread_mutexattr_getrobust_np has been deprecated;
73 programs should use the equivalent standard function
74 pthread_mutexattr_getrobust instead.
76 * The function pthread_mutexattr_setrobust_np has been deprecated;
77 programs should use the equivalent standard function
78 pthread_mutexattr_setrobust instead.
80 * The function pthread_yield has been deprecated; programs should use
81 the equivalent standard function sched_yield instead.
83 * The pthread cancellation handler is now installed with SA_RESTART and
84 pthread_cancel will always send the internal SIGCANCEL on a cancellation
85 request. It should not be visible to application since the cancellation
86 handler should either act upon cancellation (if asynchronous cancellation
87 is enabled) or ignore the cancellation internal signal. However there are
88 buggy kernel interfaces (for instance some CIFS version) that could still
89 see spurious EINTR error when cancellation interrupts a blocking syscall.
91 * Previously, glibc installed its various shared objects under versioned
92 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
93 were provided as symbolic links. Starting with glibc 2.34, the shared
94 objects are installed under their ABI sonames directly, without
95 symbolic links. This increases compatibility with distribution
96 package managers that delete removed files late during the package
97 upgrade or downgrade process.
99 * The symbols mallwatch and tr_break are now deprecated and no longer used in
100 mtrace. Similar functionality can be achieved by using conditional
101 breakpoints within mtrace functions from within gdb.
103 Changes to build and runtime requirements:
105 * On Linux, the shm_open, sem_open, and related functions now expect the
106 file shared memory file system to be mounted at /dev/shm. These functions
107 no longer search among the system's mount points for a suitable
108 replacement if /dev/shm is not available.
110 Security related changes:
112 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
113 a request for netgroup lookup, may crash due to a double-free,
114 potentially resulting in degraded service or Denial of Service on the
115 local system. Reported by Chris Schanzle.
117 CVE-2021-33574: The mq_notify function has a potential use-after-free
118 issue when using a notification type of SIGEV_THREAD and a thread
119 attribute with a non-default affinity mask.
121 The following bugs are resolved with this release:
123 [The release manager will add the list generated by
124 scripts/list-fixed-bugs.py just before the release.]
131 * The dynamic linker accepts the --list-tunables argument which prints
132 all the supported tunables. This option is disable if glibc is
133 configured with tunables disabled (--enable-tunables=no).
135 * The dynamic linker accepts the --argv0 argument and provides opportunity
136 to change argv[0] string.
138 * The dynamic linker loads optimized implementations of shared objects
139 from subdirectories under the glibc-hwcaps directory on the library
140 search path if the system's capabilities meet the requirements for
141 that subdirectory. Initially supported subdirectories include
142 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
143 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
144 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
145 subdirectory names correspond to the vendor-independent x86-64
146 microarchitecture levels defined in the x86-64 psABI supplement.
148 * The new --help option of the dynamic linker provides usage and
149 information and library search path diagnostics.
151 * The mallinfo2 function is added to report statistics as per mallinfo,
152 but with larger field widths to accurately report values that are
153 larger than fit in an integer.
155 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
157 * Support for the RISC-V ISA running on Linux has been expanded to run on
158 32-bit hardware. This is supported for the following ISA and ABI pairs:
164 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
167 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
168 glibc may use additional checks that may have an additional performance
169 overhead. At present these checks are available only on LLVM 9 and later.
170 The latest GCC available at this time (10.2) does not support this level of
173 Deprecated and removed features, and other changes affecting compatibility:
175 * The mallinfo function is marked deprecated. Callers should call
178 * When dlopen is used in statically linked programs, alternative library
179 implementations from HWCAP subdirectories are no longer loaded.
180 Instead, the default implementation is used.
182 * The deprecated <sys/vtimes.h> header and the function vtimes have been
183 removed. To support old binaries, the vtimes function continues to exist
184 as a compatibility symbol. Applications should use the getrlimit or
187 * Following a change in the tzdata 2018a release upstream, the zdump
188 program is now installed in the /usr/bin subdirectory. Previously,
189 the /usr/sbin subdirectory was used.
191 * On s390(x), the type float_t is now derived from the macro
192 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
193 hardcoded to double. This does not affect the ABI of any libraries
194 that are part of the GNU C Library, but may affect the ABI of other
195 libraries that use this type in their interfaces. The new definition
196 improves consistency with compiler behavior in many scenarios.
198 * A future version of glibc will stop loading shared objects from the
199 "tls" subdirectories on the library search path, the subdirectory that
200 corresponds to the AT_PLATFORM system name, and also stop employing
201 the legacy AT_HWCAP search mechanism. Applications should switch to
202 the new glibc-hwcaps mechanism instead; if they do not do that, only
203 the baseline version (directly from the search path directory) will be
206 Changes to build and runtime requirements:
208 * On Linux, the system administrator needs to configure /dev/pts with
209 the intended access modes for pseudo-terminals. glibc no longer
210 attemps to adjust permissions of terminal devices. The previous glibc
211 defaults ("tty" group, user read/write and group write) already
212 corresponded to what most systems used, so that grantpt did not
213 perform any adjustments.
215 * On Linux, the posix_openpt and getpt functions no longer attempt to
216 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
217 (and pseudo-terminals are supported), a devpts file system is mounted
218 on /dev/pts. Current systems already meet these requirements.
220 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
222 Security related changes:
224 CVE-2021-3326: An assertion failure during conversion from the
225 ISO-20220-JP-3 character set using the iconv function has been fixed.
226 This assertion was triggered by certain valid inputs in which the
227 converted output contains a combined sequence of two wide characters
228 crossing a buffer boundary. Reported by Tavis Ormandy.
230 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
231 invoked with input containing redundant shift sequences in the IBM1364,
232 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
234 CVE-2020-29562: An assertion failure has been fixed in the iconv function
235 when invoked with UCS4 input containing an invalid character.
237 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
238 invoked with EUC-KR input containing invalid multibyte input sequences.
240 The following bugs are resolved with this release:
242 [10635] libc: realpath portability patches
243 [16124] dynamic-link: ld.so should allow to change argv[0]
244 [17924] malloc: 'free' should not set errno
245 [18683] libc: Linux faccessat implementation can incorrectly ignore
247 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
248 [23091] hurd: missing waitid support
249 [23249] libc: Epyc and other current AMD CPUs do not select the
250 "haswell" platform subdirectory
251 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
253 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
255 [24941] libc: Make grantpt usable after multi-threaded fork in more
257 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
258 [24973] locale: iconv encounters segmentation fault when converting
259 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
260 [25399] string: undefined reference to `__warn_memset_zero_len' when
261 changing gnuc version
262 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
264 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
266 [25971] libc: s390 bits/hwcap.h out of sync with kernel
267 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
268 [26100] libc: Race in syslog(3) with regards to tag printing.
269 [26124] libc: Export <cpu-features.h>
270 [26130] nscd: Inconsistent nscd cache during pruning
271 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
272 [26224] locale: iconv hangs when converting some invalid inputs from
273 several IBM character sets (CVE-2020-27618)
274 [26341] libc: realpath cyclically call __alloca(path_max) to consume
276 [26343] manual: invalid documented return type for strerrorname_np(),
277 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
278 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
280 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
282 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
283 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
285 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
286 [26553] libc: mtx_init allows type set to "mtx_recursive" only
287 [26555] string: strerrorname_np does not return the documented value
288 [26592] libc: pointer arithmetic overflows in realpath
289 [26600] network: Transaction ID collisions cause slow DNS lookups in
291 [26606] libc: [2.33 Regression] pselect is broken on x32
292 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
293 [26620] glob: fnmatch with collating symbols results in segmentation
295 [26625] libc: [2.33 Regression] CET is disabled
296 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
297 at the end of a memory mapping
298 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
299 by the caller to the kernel
300 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
301 [26647] build: [-Werror=array-parameter=] due to different
302 declarations for __sigsetjmp
303 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
305 [26649] stdio: printf should handle non-normal x86 long double numbers
306 gracefully (CVE-2020-29573)
307 [26686] build: -Warray-parameter instances building with GCC 11
308 [26687] build: -Warray-bounds instances building with GCC 11
309 [26690] stdio: Aliasing violation in __vfscanf_internal
310 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
311 [26726] build: GCC warning calling new_composite_name with an array of
313 [26736] libc: FAIL: misc/tst-sysvshm-linux
314 [26737] libc: Random FAIL: rt/tst-shm
315 [26791] libc: Missing O_CLOEXEC in sysconf.c
316 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
318 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
320 [26818] string: aarch64: string tests may run ifunc variants that are
322 [26821] libc: Memory leak test failures on Fedora 33
323 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
324 FSGSBASE/LM/RDRAND check failure
325 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
327 [26853] libc: aarch64: Missing unwind information in statically linked
329 [26923] locale: Assertion failure in iconv when converting invalid
330 UCS4 (CVE-2020-29562)
331 [26926] dynamic-link: aarch64: library dependencies are not bti
333 [26932] libc: sh: Multiple floating point functions defined as stubs
335 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
337 [26988] dynamic-link: aarch64: BTI mprotect address is not page
339 [27002] build: libc_freeres_fn build failure with GCC 11
340 [27004] dynamic-link: ld.so is miscompiled by GCC 11
341 [27008] dynamic-link: ld.so.cache should have endianness markup
342 [27042] libc: [alpha] anonymous union in struct stat confuses
344 [27053] libc: Conformance regression in system(3) (and probably also
346 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
348 [27077] network: Do not reload /etc/nsswitch.conf from chroot
349 [27083] libc: Unsafe unbounded alloca in addmntent
350 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
352 [27130] string: "rep movsb" performance issue
353 [27150] libc: alpha: wait4() is unavailable in static linking
354 [27177] dynamic-link:
355 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
357 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
358 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
359 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
360 related to combining characters (CVE-2021-3326)
367 * Unicode 13.0.0 Support: Character encoding, character type info, and
368 transliteration tables are all updated to Unicode 13.0.0, using
369 generator scripts contributed by Mike FABIAN (Red Hat).
371 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
373 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
374 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
375 Three ABIs are supported:
381 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
382 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
384 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
385 DT_DEPAUDIT dynamic section entries of the main executable.
387 * powerpc64le supports IEEE128 long double libm/libc redirects when
388 using -mabi=ieeelongdouble to compile C code on supported GCC
389 toolchains. It is recommended to use GCC 8 or newer when testing
392 * To help detect buffer overflows and other out-of-bounds accesses
393 several APIs have been annotated with GCC 'access' attribute. This
394 should help GCC 10 issue better warnings.
396 * On Linux, functions pthread_attr_setsigmask_np and
397 pthread_attr_getsigmask_np have been added. They allow applications
398 to specify the signal mask of a thread created with pthread_create.
400 * The GNU C Library now provides the header file <sys/single_threaded.h>
401 which declares the variable __libc_single_threaded. Applications are
402 encouraged to use this variable for single-thread optimizations,
403 instead of weak references to symbols historically defined in
406 * The functions sigabbrev_np and sigdescr_np have been added. The
407 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
408 SIGHUP) while sigdescr_np returns a string describing the signal number
409 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
410 attempt to translate the return description, both functions return
411 NULL for an invalid signal number.
413 They should be used instead of sys_siglist or sys_sigabbrev and they
414 are both thread and async-signal safe. These functions are GNU extensions.
416 * The functions strerrorname_np and strerrordesc_np have been added. The
417 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
418 while strerrordesc_np returns a string describing the error number
419 (e.g "Invalid argument" for EINVAL). Different than strerror,
420 strerrordesc_np does not attempt to translate the return description, both
421 functions return NULL for an invalid error number.
423 They should be used instead of sys_errlist and sys_nerr, both are
424 thread and async-signal safe. These functions are GNU extensions.
426 * AArch64 now supports standard branch protection security hardening
427 in glibc when it is built with a GCC that is configured with
428 --enable-standard-branch-protection (or if -mbranch-protection=standard
429 flag is passed when building both GCC target libraries and glibc,
430 in either case a custom GCC is needed). This includes branch target
431 identification (BTI) and pointer authentication for return addresses
432 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
433 extensions respectively for the protection to be effective,
434 otherwise the used instructions are nops. User code can use PAC-RET
435 without libc support, but BTI requires a libc that is built with BTI
436 support, otherwise runtime objects linked into user code will not be
439 Deprecated and removed features, and other changes affecting compatibility:
441 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
442 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
443 RPC header files. Backward compatibility for old programs is kept
444 only for architectures and ABIs that have been added in or before
445 glibc 2.31. New programs need to use TI-RPC
446 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
447 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
449 * Remove configure option --enable-obsolete-nsl. libnsl is only built
450 as shared library for backward compatibility and the NSS modules "nis"
451 and "nisplus" are not built at all and libnsl's headers aren't
452 installed. This compatibility is kept only for architectures and ABIs
453 that have been added in or before version 2.28. Replacement
454 implementations based on TI-RPC, which additionally support IPv6, are
455 available from <https://github.com/thkukuk/>. This change does not
456 affect the "compat" NSS module, which does not depend on libnsl
457 since 2.27 and thus can be used without NIS.
459 * The deprecated <sys/sysctl.h> header and the sysctl function have been
460 removed. To support old binaries, the sysctl function continues to
461 exist as a compatibility symbol (on those architectures which had it),
462 but always fails with ENOSYS. This reflects the removal of the system
463 call from all architectures, starting with Linux 5.5.
465 * The sstk function is no longer available to newly linked binaries.
466 Its implementation always returned with a failure, and the function
467 was not declared in any header file.
469 * The legacy signal handling functions siginterrupt, sigpause, sighold,
470 sigrelse, sigignore and sigset, and the sigmask macro have been
471 deprecated. Applications should use the sigsuspend, sigprocmask and
472 sigaction functions instead.
474 * ldconfig now defaults to the new format for ld.so.cache. glibc has
475 already supported this format for almost 20 years.
477 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
478 are no longer available to newly linked binaries, and their declarations
479 have been removed from <string.h>. They are exported solely as
480 compatibility symbols to support old binaries. All programs should use
483 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
484 are no longer available to newly linked binaries, and their declarations
485 have been removed from <stdio.h>. They are exported solely as
486 compatibility symbols to support old binaries. All programs should use
487 strerror or strerror_r instead.
489 * Both strerror and strerror_l now share the same internal buffer in the
490 calling thread, meaning that the returned string pointer may be invalided
491 or contents might be overwritten on subsequent calls in the same thread or
492 if the thread is terminated. It makes strerror MT-safe.
494 * Using weak references to libpthread functions such as pthread_create
495 or pthread_key_create to detect the singled-threaded nature of a
496 program is an obsolescent feature. Future versions of glibc will
497 define pthread_create within libc.so.6 itself, so such checks will
498 always flag the program as multi-threaded. Applications should check
499 the __libc_single_threaded variable declared in
500 <sys/single_threaded.h> instead.
502 * The "files" NSS module no longer supports the "key" database (used for
503 secure RPC). The contents of the /etc/publickey file will be ignored,
504 regardless of the settings in /etc/nsswitch.conf. (This method of
505 storing RPC keys only supported the obsolete and insecure AUTH_DES
506 flavor of secure RPC.)
508 * The __morecore and __after_morecore_hook malloc hooks and the default
509 implementation __default_morecore have been deprecated. Applications
510 should use malloc interposition to change malloc behavior, and mmap to
511 allocate anonymous memory. A future version of glibc may require that
512 applications which use the malloc hooks must preload a special shared
513 object, to enable the hooks.
515 * The hesiod NSS module has been deprecated and will be removed in a
516 future version of glibc. System administrators are encouraged to
517 switch to other approaches for networked account databases, such as
520 Changes to build and runtime requirements:
522 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
523 long double redirects.
525 Security related changes:
527 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
528 invoked with the -c option and when processing invalid multi-byte input
529 sequences. Reported by Jan Engelhardt.
531 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
532 corruption when they were passed a pseudo-zero argument. Reported by Guido
533 Vranken / ForAllSecure Mayhem.
535 CVE-2020-1752: A use-after-free vulnerability in the glob function when
536 expanding ~user has been fixed.
538 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
539 memmove functions has been fixed. Discovered by Jason Royes and Samual
540 Dytrych of the Cisco Security Assessment and Penetration Team (See
543 The following bugs are resolved with this release:
545 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
546 [10441] manual: Backtraces code example lacks error checking
547 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
548 timer_sigev_thread dangerous
549 [14231] stdio: stdio-common tests memory requirements
550 [14578] libc: /proc-based emulation for lchmod, fchmodat
551 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
552 filtee has constructor
553 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
554 sequences (CVE-2016-10228)
555 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
556 character entities for infinity & pi
557 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
558 segfaults in applications
559 [20543] libc: Please move from .gnu.linkonce to comdat
560 [22489] network: gcc warns about implicit convertion in
561 ICMP6_FILTER_SETPASS with -Wsign-conversion
562 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
563 [23294] math: Complex _FloatN functions are redirected to the wrong
564 function with -mlong-double-64
565 [23296] libc: Data race in setting function descriptor during lazy
567 [23668] dynamic-link: ldconfig: Default to the new format for
569 [23819] hurd: hurd: Add C11 thread support
570 [23990] build: test-container error out on failure to exec child.
571 [23991] build: shell-container typo in run_command_array
572 [24638] manual: Error in example of parsing a template string
573 [24654] manual: Wrong declaration of wcschr in libc manual
574 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
576 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
577 dynamically loaded dsos
578 [25098] nptl: nptl: ctype classification functions are not AS-Safe
579 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
581 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
582 restore EAX, ECX and EDX
583 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
584 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
585 [25420] network: Race condition in resolv_conf.c can result in caching
586 stale configuration forever
587 [25487] math: sinl() stack corruption from crafted input
589 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
591 [25523] libc: MIPS/Linux inline syscall template is miscompiled
592 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
594 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
595 on 32 bit and old kernel
596 [25635] libc: arm: Wrong sysdep order selection for soft-fp
597 [25639] localedata: Some names of days and months wrongly spelt in
599 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
600 amount of sigset_t bytes
601 [25691] stdio: printf: memory leak when printing long multibyte
603 [25715] libc: system() returns wrong errors when posix_spawn fails
604 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
605 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
606 state for conversions that produce two Unicode code points
607 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
608 for linux x86_64 leads to livelock
609 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
610 test failures, invalid instruction in ld.so
611 [25790] glob: Typo in tst-fnmatch.input
612 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
614 [25819] localedata: Update locale data to Unicode 13.0.0
615 [25824] libc: Abnormal function of strnlen in aarch64
616 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
617 [25896] libc: Incorrect prctl
618 [25902] libc: Bad LOADARGS_N
619 [25905] dynamic-link: VSX registers are corrupted during PLT
620 resolution when glibc is built with --disable-multi-arch and --with-
622 [25933] string: Off by one error in __strncmp_avx2 when
623 length=VEC_SIZE*4 and strings are at page boundaries can cause a
625 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
626 exiting detached thread
627 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
629 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
631 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
632 [26073] math: getpayload() has wrong return value
633 [26076] dynamic-link: dlmopen crashes after failing to load
634 dependencies in audit mode
635 [26120] localedata: column width of of some Korean
636 JUNGSEONG/JONGSEONG characters wrong (should be 0)
637 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
638 [26133] libc: Incorrect need_arch_feature_F16C
639 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
641 [26149] libc: PKU is usable only if OSPKE is set
642 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
644 [26208] libc: Incorrect bit_cpu_CLFSH
645 [26210] network: Incorrect use of hidden symbols for global sunrpc
647 [26211] stdio: printf integer overflow calculating allocation size
648 [26214] stdio: printf_fp double free
649 [26215] stdio: printf_fp memory leak
650 [26232] time: FAIL: support/tst-timespec for 32-bit targets
651 [26258] nss: nss_compat should not read input files with mmap
652 [26332] string: Incorrect cache line size load causes memory
660 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
661 enable features from the draft ISO C2X standard. Only some features from
662 this draft standard are supported by the GNU C Library, and as the draft
663 is under active development, the set of features enabled by this macro is
664 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
665 by compiling with "gcc -std=gnu2x".
667 * The <math.h> functions that round their results to a narrower type now
668 have corresponding type-generic macros in <tgmath.h>, as defined in TS
669 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
670 Clarification Request 13 to TS 18661-3.
672 * The function pthread_clockjoin_np has been added, enabling join with a
673 terminated thread with a specific clock. It allows waiting against
674 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
676 * New locale added: mnw_MM (Mon language spoken in Myanmar).
678 * The DNS stub resolver will optionally send the AD (authenticated data) bit
679 in queries if the trust-ad option is set via the options directive in
680 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
681 mode, the AD bit, as provided by the name server, is available to
682 applications which call res_search and related functions. In the default
683 mode, the AD bit is not set in queries, and it is automatically cleared in
684 responses, indicating a lack of DNSSEC validation. (Therefore, the name
685 servers and the network path to them are treated as untrusted.)
687 Deprecated and removed features, and other changes affecting compatibility:
689 * The totalorder and totalordermag functions, and the corresponding
690 functions for other floating-point types, now take pointer arguments to
691 avoid signaling NaNs possibly being converted to quiet NaNs in argument
692 passing. This is in accordance with the resolution of Clarification
693 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
694 floating-point arguments directly will continue to work.
696 * The obsolete function stime is no longer available to newly linked
697 binaries, and its declaration has been removed from <time.h>.
698 Programs that set the system time should use clock_settime instead.
700 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
701 in a future version of glibc. In this release, the header still exists
702 but calling ftime will cause a compiler warning. All programs should use
703 gettimeofday or clock_gettime instead.
705 * The gettimeofday function no longer reports information about a
706 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
707 many years, as it cannot handle the full complexity of the world's
708 timezones, but hitherto we have supported it on a best-effort basis.
709 Changes required to support 64-bit time_t on 32-bit architectures have
710 made this no longer practical.
712 As of this release, callers of gettimeofday with a non-null 'tzp' argument
713 should expect to receive a 'struct timezone' whose tz_minuteswest and
714 tz_dsttime fields are zero. (For efficiency reasons, this does not always
715 happen on a few Linux-based ports. This will be corrected in a future
718 All callers should supply a null pointer for the 'tzp' argument to
719 gettimeofday. For accurate information about the time zone associated
720 with the current time, use the localtime function.
722 gettimeofday itself is obsolescent according to POSIX. We have no plans
723 to remove access to this function, but portable programs should consider
724 using clock_gettime instead.
726 * The settimeofday function can still be used to set a system-wide time
727 zone when the operating system supports it. This is because the Linux
728 kernel reused the API, on some architectures, to describe a system-wide
729 time-zone-like offset between the software clock maintained by the kernel,
730 and the "RTC" clock that keeps time when the system is shut down.
732 However, to reduce the odds of this offset being set by accident,
733 settimeofday can no longer be used to set the time and the offset
734 simultaneously. If both of its two arguments are non-null, the call
735 will fail (setting errno to EINVAL).
737 Callers attempting to set this offset should also be prepared for the call
738 to fail and set errno to ENOSYS; this already happens on the Hurd and on
739 some Linux architectures. The Linux kernel maintainers are discussing a
740 more principled replacement for the reused API. After a replacement
741 becomes available, we will change settimeofday to fail with ENOSYS on all
742 platforms when its 'tzp' argument is not a null pointer.
744 settimeofday itself is obsolescent according to POSIX. Programs that set
745 the system time should use clock_settime and/or the adjtime family of
746 functions instead. We may cease to make settimeofday available to newly
747 linked binaries after there is a replacement for Linux's time-zone-like
750 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
751 the optional CAS instruction is implemented (for instance, LEON processors
752 are still supported, but SuperSPARC processors are not).
754 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
757 * If a lazy binding failure happens during dlopen, during the execution of
758 an ELF constructor, the process is now terminated. Previously, the
759 dynamic loader would return NULL from dlopen, with the lazy binding error
760 captured in a dlerror message. In general, this is unsafe because
761 resetting the stack in an arbitrary function call is not possible.
763 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
764 executable stack unless explicitly configured at build time to require
765 minimum kernel version 4.8 or newer. This is because executing
766 floating-point branches on a non-executable stack on Linux kernels prior to
767 4.8 can lead to application crashes for some MIPS configurations. While
768 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
769 expected to enable non-executable stack by default with PT_GNU_STACK by
770 default and is thus likely to trigger a crash on older kernels.
772 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
773 non-executable stack while dropping support for older kernels.
775 * System call wrappers for time system calls now use the new time64 system
776 calls when available. On 32-bit targets, these wrappers attempt to call
777 the new system calls first and fall back to the older 32-bit time system
778 calls if they are not present. This may cause issues in environments
779 that cannot handle unsupported system calls gracefully by returning
780 -ENOSYS. Seccomp sandboxes are affected by this issue.
782 Changes to build and runtime requirements:
784 * It is no longer necessary to have recent Linux kernel headers to build
785 working (non-stub) system call wrappers on all architectures except 64-bit
786 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
788 * The ChangeLog file is no longer present in the toplevel directory of the
789 source tree. ChangeLog files are located in the ChangeLog.old directory as
790 ChangeLog.N where the highest N has the latest entries.
792 Security related changes:
794 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
795 out-of-bounds write when executed in a signal frame context.
797 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
798 environment variable during program execution after a security
799 transition, allowing local attackers to restrict the possible mapping
800 addresses for loaded libraries and thus bypass ASLR for a setuid
801 program. Reported by Marcin Kościelnicki.
803 The following bugs are resolved with this release:
805 [12031] localedata: iconv -t ascii//translit with Greek characters
806 [15813] libc: Multiple issues in __gen_tempname
807 [17726] libc: [arm, sparc] profil_counter should be compat symbol
808 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
809 [19767] libc: vdso is not used with static linking
810 [19903] hurd: Shared mappings not being inherited by children processes
811 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
812 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
814 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
815 Symbols-A/B Unicode blocks
816 [23518] libc: Eliminate __libc_utmp_jump_table
817 [24026] malloc: malloc_info() returns wrong numbers
818 [24054] localedata: Many locales are missing date_fmt
819 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
820 [24304] dynamic-link: Lazy binding failure during ELF
821 constructors/destructors is not fatal
822 [24376] libc: RISC-V symbol size confusion with _start
823 [24682] localedata: zh_CN first weekday should be Monday per GB/T
825 [24824] libc: test-in-container does not install charmap files compatible
827 [24844] regex: regex bad pointer / leakage if malloc fails
828 [24867] malloc: Unintended malloc_info formatting changes
829 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
830 [24880] libc: login: utmp implementation uses struct flock with fcntl64
831 [24882] libc: login: pututline uses potentially outdated cache
832 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
833 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
835 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
837 [24930] dynamic-link: dlopen of PIE executable can result in
838 _dl_allocate_tls_init assertion failure
839 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
840 (stringop-overflow error)
841 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
842 functions other can lead to crashes
843 [24967] libc: jemalloc static linking causes runtime failure
844 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
846 [25035] libc: sbrk() failure handled poorly in tunables_strdup
847 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
848 [25097] libc: new -Warray-bounds with GCC 10
849 [25112] dynamic-link: dlopen must not make new objects accessible when it
850 still can fail with an error
851 [25139] localedata: Please add the new mnw_MM locale
852 [25149] regex: Array bounds violation in proceed_next_node
853 [25157] dynamic-link: Audit cookie for the dynamic loader is not
854 initialized correctly
855 [25189] libc: glibc's __glibc_has_include causes issues with clang
857 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
859 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
860 binaries (CVE-2019-19126)
861 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
863 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
865 [25232] string: <string.h> does not enable const correctness for strchr et
867 [25233] localedata: Consider "." as the thousands separator for sl_SI
869 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
870 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
871 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
873 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
874 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
876 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
877 (dl_initfirst) link map pointer
878 [25401] malloc: pvalloc must not have __attribute_alloc_size__
879 [25423] libc: Array overflow in backtrace on powerpc
880 [25425] network: Missing call to __resolv_context_put in
881 getaddrinfo.c:gethosts
888 * Unicode 12.1.0 Support: Character encoding, character type info, and
889 transliteration tables are all updated to Unicode 12.1.0, using
890 generator scripts contributed by Mike FABIAN (Red Hat).
892 * The dynamic linker accepts the --preload argument to preload shared
893 objects, in addition to the LD_PRELOAD environment variable.
895 * The twalk_r function has been added. It is similar to the existing
896 twalk function, but it passes an additional caller-supplied argument
897 to the callback function.
899 * On Linux, the getdents64, gettid, and tgkill functions have been added.
901 * Minguo (Republic of China) calendar support has been added as an
902 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
905 * The entry for the new Japanese era has been added for ja_JP locale.
907 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
908 pvalloc, memalign, and posix_memalign fail now with total object size
909 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
910 pointer subtraction within the allocated object, where results might
911 overflow the ptrdiff_t type.
913 * The dynamic linker no longer refuses to load objects which reference
914 versioned symbols whose implementation has moved to a different soname
915 since the object has been linked. The old error message, symbol
916 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
917 link time reference, is gone.
919 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
920 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
921 functions. These behave similarly to their "timed" equivalents, but also
922 accept a clockid_t parameter to determine which clock their timeout should
923 be measured against. All functions allow waiting against CLOCK_MONOTONIC
924 and CLOCK_REALTIME. The decision of which clock to be used is made at the
925 time of the wait (unlike with pthread_condattr_setclock, which requires
926 the clock choice at initialization time).
928 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
929 work, new resolvers can use a second argument which can be extended in
930 the future, currently it contains the AT_HWCAP2 value.
932 Deprecated and removed features, and other changes affecting compatibility:
934 * The copy_file_range function fails with ENOSYS if the kernel does not
935 support the system call of the same name. Previously, user space
936 emulation was performed, but its behavior did not match the kernel
937 behavior, which was deemed too confusing. Applications which use the
938 copy_file_range function can no longer rely on glibc to provide a fallback
939 on kernels that do not support the copy_file_range system call, and if
940 this function returns ENOSYS, they will need to use their own fallback.
941 Support for copy_file_range for most architectures was added in version
942 4.5 of the mainline Linux kernel.
944 * The functions clock_gettime, clock_getres, clock_settime,
945 clock_getcpuclockid, clock_nanosleep were removed from the librt library
946 for new applications (on architectures which had them). Instead, the
947 definitions in libc will be used automatically, which have been available
950 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
951 and <sys/stropts.h> have been removed.
953 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
954 resolver flag (deprecated in glibc 2.25) have been removed.
956 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
957 resolver have been removed from <resolv.h>.
959 * With --enable-bind-now, installed programs are now linked with the
962 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
963 configurations) has been removed, following the deprecation of this
964 subarchitecture in version 8 of GCC, and its removal in version 9.
966 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
967 header have been removed.
969 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
970 deprecated and will be removed from a future version of glibc.
971 Application should directly access /proc instead. For obtaining random
972 bits, the getentropy function can be used.
974 Changes to build and runtime requirements:
976 * GCC 6.2 or later is required to build the GNU C Library.
978 Older GCC versions and non-GNU compilers are still supported when
979 compiling programs that use the GNU C Library.
981 Security related changes:
983 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
984 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
985 has undefined behavior. On x32, the size_t argument may be passed
986 in the lower 32 bits of the 64-bit RDX register with non-zero upper
987 32 bits. When it happened with the sign bit of RDX register set,
988 memcmp gave the wrong result since it treated the size argument as
989 zero. Reported by H.J. Lu.
991 CVE-2019-9169: Attempted case-insensitive regular-expression match
992 via proceed_next_node in posix/regexec.c leads to heap-based buffer
993 over-read. Reported by Hongxu Chen.
995 The following bugs are resolved with this release:
997 [2872] locale: Transliteration Cyrillic -> ASCII fails
998 [6399] libc: gettid() should have a wrapper
999 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1000 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1001 [17396] localedata: globbing for locale by [[.collating-element.]]
1002 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1003 [18465] malloc: memusagestat is built using system C library
1004 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1005 invalid input drops valid char
1006 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1007 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1008 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1009 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1010 [23352] malloc: __malloc_check_init still defined in public header
1012 [23403] nptl: Wrong alignment of TLS variables
1013 [23501] libc: nftw() doesn't return dangling symlink's inode
1014 [23733] malloc: Check the count before calling tcache_get()
1015 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1017 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1018 [23844] nptl: pthread_rwlock_trywrlock results in hang
1019 [23983] argparse: Missing compat versions of argp_failure and argp_error
1020 for long double = double
1021 [23984] libc: Missing compat versions of err.h and error.h functions for
1022 long double = double
1023 [23996] localedata: Dutch salutations
1024 [24040] libc: riscv64: unterminated call chain in __thread_start
1025 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1027 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1028 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1030 [24114] regex: regexec buffer read overrun in "grep -i
1031 '\(\(\)*.\)*\(\)\(\)\1'"
1032 [24122] libc: Segfaults if 0 returned from la_version
1033 [24153] stdio: Some input functions do not react to stdin assignment
1034 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1035 RDX is set) (CVE-2019-7309)
1036 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1037 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1038 not the default "nor"
1039 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1040 false positives, change to modern flexible array
1041 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1042 instructions while maintaining the robust mutex list due to missing
1044 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1045 unnecessary librt dependencies
1046 [24200] localedata: Revert first_weekday removal in en_IE locale
1047 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1048 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1049 [24216] malloc: Check for large bin list corruption when inserting
1051 [24228] stdio: old x86 applications that use legacy libio crash on exit
1052 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1054 [24293] localedata: Missing Minguo calendar support for TW locales
1055 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1056 tt_RU (Tatar) locale
1057 [24307] localedata: Update locale data to Unicode 12.0.0
1058 [24323] dynamic-link: dlopen should not be able open PIE objects
1059 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1060 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1061 tt_RU (Tatar) locale
1062 [24370] localedata: Add lang_name for tt_RU locale
1063 [24372] locale: Binary locale files are not architecture independent
1064 [24394] time: strptime %Ey mis-parses final year of era
1065 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1067 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1069 [24531] malloc: Malloc tunables give tcache assertion failures
1070 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1072 [24535] localedata: Update locale data to Unicode 12.1.0
1073 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1074 kernels and break testing
1075 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1076 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1077 [-Werror=format-overflow=]
1078 [24570] libc: alpha: compat msgctl uses __IPC_64
1079 [24584] locale: Data race in __wcsmbs_clone_conv
1080 [24588] stdio: Remove codecvt vtables from libio
1081 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1083 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1084 [24632] stdio: Old binaries which use freopen with default stdio handles
1086 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1088 [24652] localedata: szl_PL spelling correction
1089 [24695] nss: nss_db: calling getpwent after endpwent crashes
1090 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1091 in /etc/nsswitch.conf
1092 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1093 [24740] libc: getdents64 type confusion
1094 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1095 always implemented in the same library
1096 [24744] libc: Remove copy_file_range emulation
1097 [24757] malloc: memusagestat is linked against system libpthread
1098 [24794] libc: Partial test suite run builds corrupt test-in-container
1106 * The getcpu wrapper function has been added, which returns the currently
1107 used CPU and NUMA node. This function is Linux-specific.
1109 * A new convenience target has been added for distribution maintainers
1110 to build and install all locales as directories with files. The new
1111 target is run by issuing the following command in your build tree:
1112 'make localedata/install-locale-files', with an optional DESTDIR
1113 to set the install root if you wish to install into a non-default
1114 configured location.
1116 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1118 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1119 for _GNU_SOURCE, to match BSD environments.
1121 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1122 indicates that it will abort the transaction prior to entering the kernel
1123 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1124 suspended, and this caused some undefined side-effects issues by aborting
1125 transactions manually. Glibc avoided it by abort transactions manually on
1126 each syscall, but it lead to performance issues on newer kernels where the
1127 HTM state is saved and restore lazily (the state being saved even when the
1128 process actually does not use HTM).
1130 * The functions posix_spawn_file_actions_addchdir_np and
1131 posix_spawn_file_actions_addfchdir_np have been added, enabling
1132 posix_spawn and posix_spawnp to run the new process in a different
1133 directory. These functions are GNU extensions. The function
1134 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1137 * The popen and system do not run atfork handlers anymore (BZ#17490).
1138 Although it is a possible POSIX violation, the POSIX rationale in
1139 pthread_atfork documentation regarding atfork handlers is to handle
1140 inconsistent mutex state after a fork call in a multi-threaded process.
1141 In both popen and system there is no direct access to user-defined mutexes.
1143 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1144 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1146 - C-SKY ABIV2 soft-float little-endian
1147 - C-SKY ABIV2 hard-float little-endian
1149 * strftime's default formatting of a locale's alternative year (%Ey)
1150 has been changed to zero-pad the year to a minimum of two digits,
1151 like "%y". This improves the display of Japanese era years during
1152 the first nine years of a new era, and is expected to be harmless
1153 for all other locales (only Japanese locales regularly have
1154 alternative year numbers less than 10). Zero-padding can be
1155 overridden with the '_' or '-' flags (which are GNU extensions).
1157 * As a GNU extension, the '_' and '-' flags can now be applied to
1158 "%EY" to control how the year number is formatted; they have the
1159 same effect that they would on "%Ey".
1161 Deprecated and removed features, and other changes affecting compatibility:
1163 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1164 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1166 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1167 in <sys/procfs.h>, has been corrected to match the type actually used by
1168 the Linux kernel. This affects the size and layout of that structure on
1169 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1171 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1172 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1173 defined in <sys/procfs.h>, has been corrected to match the type actually
1174 used by the Linux kernel. This affects the size and layout of those
1177 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1178 meant to scan a string and allocate space for it with malloc, is now
1179 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1180 defined. This extension conflicts with C99's use of '%a' to scan a
1181 hexadecimal floating-point number, which is now available to programs
1182 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1184 POSIX.1-2008 includes the feature of allocating a buffer for string input
1185 with malloc, using the modifier letter 'm' instead. Programs using
1186 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1187 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1188 C99 '%a' no longer need to avoid _GNU_SOURCE.
1190 GCC's -Wformat warnings can detect most uses of this extension, as long
1191 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1192 __attribute__ ((format (scanf, ...))).
1194 Changes to build and runtime requirements:
1196 * Python 3.4 or later is required to build the GNU C Library.
1198 * On most architectures, GCC 5 or later is required to build the GNU C
1199 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1201 Older GCC versions and non-GNU compilers are still supported when
1202 compiling programs that use the GNU C Library.
1204 Security related changes:
1206 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1207 denial of service due to resource exhaustion when processing getaddrinfo
1208 calls with crafted host names. Reported by Guido Vranken.
1210 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1211 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1212 happened, accessing the 32-bit size_t value as the full 64-bit register
1213 in the assembly string/memory functions would cause a buffer overflow.
1214 Reported by H.J. Lu.
1216 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1217 addresses with arbitrary trailing characters, potentially leading to data
1218 or command injection issues in applications.
1220 The following bugs are resolved with this release:
1222 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1223 [10496] localedata: 12h time representation in multiple locales faulty
1224 [10797] localedata: it_IT locale numeric does not have a separator for
1226 [11319] libc: dprintf doesn't handle errors properly
1227 [16346] time: mktime: potentially unsafe use of localtime_offset
1228 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1230 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1231 posix_spawn_file_actions_addfchdir_np
1232 [17426] localedata: Indian locales: set the correct date format
1233 [17490] stdio: popen should not invoke atfork handlers
1234 [17783] libc: TIOCSER_TEMT conditions inconsistent
1235 [18040] regex: use-after-free in regexec/get_subexp
1236 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1237 [20018] network: getaddrinfo should reject IP addresses with trailing
1238 characters (CVE-2016-10739)
1239 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1240 [20271] libc: Missing "\n" in __libc_fatal calls
1241 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1242 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1243 pointer argument is non-NULL
1244 [21037] stdio: open_memstream and freopen
1245 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1246 [21716] time: Crash in glibc's mktime in low-memory situations
1247 [22834] stdio: Subprocess forked by popen may crash in Linux when
1248 multithreads call popen
1249 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1250 and pthread_create fails.
1251 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1252 [23125] libc: riscv64: endless loop when throwing an exception from a
1254 [23275] nptl: Race in pthread_mutex_lock while promoting to
1255 PTHREAD_MUTEX_ELISION_NP.
1256 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1258 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1260 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1262 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1263 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1265 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1266 [23521] nss: get_next_alias nss_files file stream leak
1267 [23538] nptl: Hang in pthread_cond_broadcast
1268 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1269 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1270 [23579] libc: Errors misreported in preadv2
1271 [23597] build: support/test-container.c doesn't work with different
1273 [23603] time: mktime signed integer overflow on large timestamps
1274 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1275 [23614] libc: powerpc: missing CFI register information in __mpn_*
1277 [23637] string: Generic strstr/strcasestr fails with huge needles
1278 [23640] libc: no way to easily clear FD_CLOEXEC in
1279 posix_spawn_file_actions_adddup2()
1280 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1282 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1284 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1285 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1286 bits/types/struct_rusage.h
1287 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1289 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1291 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1292 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1293 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1295 [23724] localedata: Albanian date formats are incorrect
1296 [23735] math: libnldbl_nonshared.a references internal libm symbols
1297 [23740] localedata: kl_GL: Month names and date formats need update
1298 [23744] regex: regex refactorings to remove BE, avoid duplication
1299 [23745] time: mktime fix for Gnulib + coreutils
1300 [23758] time: Improve the width of alternate representation for year in
1302 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1303 [23789] time: mktime does not set errno on failure
1304 [23791] localedata: Wrong monetary format for ca_ES locale
1305 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1306 [23794] locale: c16rtomb does not handle surrogate pairs
1307 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1308 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1309 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1310 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1311 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1312 [23862] libc: [sh] missing kernel-features.h undefines
1313 [23864] libc: [riscv] missing kernel-features.h undefines
1314 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1315 [23907] malloc: Incorrect double-free malloc tcache check disregards
1317 [23913] libc: off-by-one in function maybe_script_execute in
1318 sysdeps/posix/spawni.c
1319 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1320 [23923] locale: Add --no-hard-links option to localedef
1321 [23927] network: Linux if_nametoindex() does not close descriptor
1323 [23961] math: powf can overflow to inf without setting errno in non-
1324 nearest rounding mode
1325 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1326 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1327 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1328 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1329 [24011] localedata: Fixed small type in comment for locale bs_BA
1330 [24018] libc: gettext() may return NULL
1331 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1332 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1333 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1335 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1336 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1338 [24046] localedata: en_US locale doesn't define date_fmt
1339 [24063] manual: @var{errno} should be @code{errno}
1340 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1341 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1343 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1345 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1347 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1349 [24112] network: Do not send DNS queries for non-host names (where all
1350 answers will be rejected)
1351 [24130] libc: alpha __remqu corrupts $f3 register
1358 * The localization data for ISO 14651 is updated to match the 2016
1359 Edition 4 release of the standard, this matches data provided by
1360 Unicode 9.0.0. This update introduces significant improvements to the
1361 collation of Unicode characters. This release deviates slightly from
1362 the standard in that the collation element ordering for lowercase and
1363 uppercase LATIN script characters is adjusted to ensure that regular
1364 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1365 is not matched by [a-z]. With the update many locales have been
1366 updated to take advantage of the new collation information. The new
1367 collation information has increased the size of the compiled locale
1368 archive or binary locales.
1370 * The GNU C Library can now be compiled with support for Intel CET, AKA
1371 Intel Control-flow Enforcement Technology. When the library is built
1372 with --enable-cet, the resulting glibc is protected with indirect
1373 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1374 compatible with all existing executables and shared libraries. This
1375 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1376 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1377 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1378 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1379 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1380 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1383 * The GNU C Library now has correct support for ABSOLUTE symbols
1384 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1385 relocated incorrectly or in some cases discarded. The GNU linker can
1386 make use of the newer semantics, but it must communicate it to the
1387 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1388 field) to indicate such support is required.
1390 * Unicode 11.0.0 Support: Character encoding, character type info, and
1391 transliteration tables are all updated to Unicode 11.0.0, using
1392 generator scripts contributed by Mike FABIAN (Red Hat).
1394 * <math.h> functions that round their results to a narrower type are added
1395 from TS 18661-1:2014 and TS 18661-3:2015:
1397 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1398 fMxaddfNx functions.
1400 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1401 fMxsubfNx functions.
1403 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1404 fMxmulfNx functions.
1406 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1407 fMxdivfNx functions.
1409 * Two grammatical forms of month names are now supported for the following
1410 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1411 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1412 support two grammatical forms in abbreviated month names: Catalan, Greek,
1415 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1416 include the support for two grammatical forms of month names.
1418 * Building and running on GNU/Hurd systems now works without out-of-tree
1421 * The renameat2 function has been added, a variant of the renameat function
1422 which has a flags argument. If the flags are zero, the renameat2 function
1423 acts like renameat. If the flag is not zero and there is no kernel
1424 support for renameat2, the function will fail with an errno value of
1425 EINVAL. This is different from the existing gnulib function renameatu,
1426 which performs a plain rename operation in case of a RENAME_NOREPLACE
1427 flags and a non-existing destination (and therefore has a race condition
1428 that can clobber the destination inadvertently).
1430 * The statx function has been added, a variant of the fstatat64
1431 function with an additional flags argument. If there is no direct
1432 kernel support for statx, glibc provides basic stat support based on
1433 the fstatat64 function.
1435 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1436 library if installed. libidn2 version 2.0.5 or later is recommended. If
1437 libidn2 is not available, internationalized domain names are not encoded
1438 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1439 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1440 with an encoding error.) Flags which used to change the IDN encoding and
1441 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1442 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1443 deprecated. They no longer have any effect.
1445 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1446 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1447 range of ELF gABI expressions including such constructs as
1448 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1449 have been further restricted, and where in the past a dynamic string
1450 token sequence may have been interpreted as a literal string it will
1451 now cause a load failure. These load failures were always considered
1452 unspecified behaviour from the perspective of the dynamic loader, and
1453 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1454 results in a load failure now.
1456 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1457 implementation includes all the standard functions provided by
1460 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1461 thrd_detach, thrd_exit, and thrd_join for thread management.
1463 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1464 mtx_destroy for mutual exclusion.
1466 - call_once for function call synchronization.
1468 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1469 cnd_wait for conditional variables.
1471 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1473 Application developers must link against libpthread to use ISO C threads.
1475 Deprecated and removed features, and other changes affecting compatibility:
1477 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1478 installed. Software that was using either header should be updated to
1479 use standard <stdio.h> interfaces instead.
1481 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1482 This was never required by the C standard, and the macros just expanded
1483 to call alternative names for the same functions. If you hoped getc and
1484 putc would provide performance improvements over fgetc and fputc, instead
1485 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1486 necessary, flockfile and funlockfile.
1488 * All stdio functions now treat end-of-file as a sticky condition. If you
1489 read from a file until EOF, and then the file is enlarged by another
1490 process, you must call clearerr or another function with the same effect
1491 (e.g. fseek, rewind) before you can read the additional data. This
1492 corrects a longstanding C99 conformance bug. It is most likely to affect
1493 programs that use stdio to read interactive input from a terminal.
1496 * The macros 'major', 'minor', and 'makedev' are now only available from
1497 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1498 headers that happen to include <sys/types.h>. These macros are rarely
1499 used, not part of POSIX nor XSI, and their names frequently collide with
1500 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1501 further explanation.
1503 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1504 these macros should first include <sys/types.h>, and then include
1505 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1507 * The tilegx*-*-linux-gnu configurations are no longer supported.
1509 * The obsolete function ustat is no longer available to newly linked
1510 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1511 function has been deprecated in favor of fstatfs and statfs.
1513 * The obsolete function nfsservctl is no longer available to newly linked
1514 binaries. This function was specific to systems using the Linux kernel
1515 and could not usefully be used with the GNU C Library on systems with
1516 version 3.1 or later of the Linux kernel.
1518 * The obsolete function name llseek is no longer available to newly linked
1519 binaries. This function was specific to systems using the Linux kernel
1520 and was not declared in a header. Programs should use the lseek64 name
1521 for this function instead.
1523 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1524 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1525 previously selected by them is now always enabled.
1527 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1528 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1529 restriction (rejecting '_' in host names, among other things) has been
1530 removed, for increased compatibility with non-IDN name resolution.
1532 * The fcntl function now have a Long File Support variant named fcntl64. It
1533 is added to fix some Linux Open File Description (OFD) locks usage on non
1534 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1535 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1536 locks act as a cancellation entrypoint.
1538 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1539 ecb_crypt, and des_setparity are no longer available to newly linked
1540 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1541 longer installed. These functions encrypted and decrypted data with the
1542 DES block cipher, which is no longer considered secure. Software that
1543 still uses these functions should switch to a modern cryptography library,
1546 * Reflecting the removal of the encrypt and setkey functions above, the
1547 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1548 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1551 * The obsolete function fcrypt is no longer available to newly linked
1552 binaries. It was just another name for the standard function crypt,
1553 and it has not appeared in any header file in many years.
1555 * We have tentative plans to hand off maintenance of the passphrase-hashing
1556 library, libcrypt, to a separate development project that will, we hope,
1557 keep up better with new passphrase-hashing algorithms. We will continue
1558 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1559 'crypt_r' should not need to change at all; however, distributions will
1560 need to install <crypt.h> and libcrypt from a separate project.
1562 In this release, if the configure option --disable-crypt is used, glibc
1563 will not install <crypt.h> or libcrypt, making room for the separate
1564 project's versions of these files. The plan is to make this the default
1565 behavior in a future release.
1567 Changes to build and runtime requirements:
1569 GNU make 4.0 or later is now required to build glibc.
1571 Security related changes:
1573 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1574 been fixed by removing the glibc-internal IDNA implementation and using
1575 the system-provided libidn2 library instead. Originally reported by Hanno
1576 Böck and Christian Weisgerber.
1578 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1579 architecture could corrupt memory. Reported by Max Horn.
1581 CVE-2018-11236: Very long pathname arguments to realpath function could
1582 result in an integer overflow and buffer overflow. Reported by Alexey
1585 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1586 architecture could write beyond the target buffer, resulting in a buffer
1587 overflow. Reported by Andreas Schwab.
1589 The following bugs are resolved with this release:
1591 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1592 [6889] manual: 'PWD' mentioned but not specified
1593 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1594 when __WORDSIZE != 64
1595 [13762] regex: re_search etc. should return -2 on memory exhaustion
1596 [13888] build: /tmp usage during testing
1597 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1598 [14092] nptl: Support C11 threads
1599 [14095] localedata: Review / update collation data from Unicode / ISO
1601 [14508] libc: -Wformat warnings
1602 [14553] libc: Namespace pollution loff_t in sys/types.h
1603 [14890] libc: Make NT_PRFPREG canonical.
1604 [15105] libc: Extra PLT references with -Os
1605 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1607 [16335] manual: Feature test macro documentation incomplete and out of
1609 [16552] libc: Unify umount implementations in terms of umount2
1610 [17082] libc: htons et al.: statement-expressions prevent use on global
1611 scope with -O1 and higher
1612 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1613 [17438] localedata: pt_BR: wrong d_fmt delimiter
1614 [17662] libc: please implement binding for the new renameat2 syscall
1615 [17721] libc: __restrict defined as /* Ignore */ even in c11
1616 [17979] libc: inconsistency between uchar.h and stdint.h
1617 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1618 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1619 horrible machine code)
1620 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1622 [18471] libc: llseek should be a compat symbol
1623 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1625 [18991] nss: nss_files skips large entry in database
1626 [19239] libc: Including stdlib.h ends up with macros major and minor being
1628 [19463] libc: linknamespace failures when compiled with -Os
1629 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1630 [19527] locale: Normalized charset name not recognized by setlocale
1631 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1632 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1634 [19728] network: out of bounds stack read in libidn function
1635 idna_to_ascii_4i (CVE-2016-6261)
1636 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1637 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1638 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1640 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1641 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1642 [20419] dynamic-link: files with large allocated notes crash in
1644 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1645 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1646 [20980] manual: CFLAGS environment variable replaces vital options
1647 [21163] regex: Assertion failure in pop_fail_stack when executing a
1648 malformed regexp (CVE-2015-8985)
1649 [21234] manual: use of CFLAGS makes glibc detect no optimization
1650 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1651 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1652 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1653 [21508] locale: intl/tst-gettext failure with latest msgfmt
1654 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1655 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1656 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1658 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1660 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1661 [22247] network: Integer overflow in the decode_digit function in
1662 puny_decode.c in libidn (CVE-2017-14062)
1663 [22342] nscd: NSCD not properly caching netgroup
1664 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1665 [22550] localedata: es_ES locale (and other es_* locales): collation
1666 should treat ñ as a primary different character, sync the collation
1667 for Spanish with CLDR
1668 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1669 by gcc configured with --enable-default-pie
1670 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1671 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1672 crossing 2GB threshold (CVE-2017-18269)
1673 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1675 [22735] time: Misleading typo in time.h source comment regarding
1677 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1678 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1679 `__assert_perror_fail ()' to `__assert_fail_base ()'
1680 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1682 [22786] libc: Stack buffer overflow in realpath() if input size is close
1683 to SSIZE_MAX (CVE-2018-11236)
1684 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1685 through an absolute DT_NEEDED path
1686 [22792] build: tcb-offsets.h dependency dropped
1687 [22797] libc: pkey_get() uses non-reserved name of argument
1688 [22807] libc: PTRACE_* constants missing for powerpc
1689 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1690 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1691 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1692 [22848] localedata: ca_ES: update date definitions from CLDR
1693 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1694 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1695 [22896] localedata: Update locale data for an_ES
1696 [22902] math: float128 test failures with GCC 8
1697 [22918] libc: multiple common of `__nss_shadow_database'
1698 [22919] libc: sparc32: backtrace yields infinite backtrace with
1700 [22926] libc: FTBFS on powerpcspe
1701 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1703 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1704 [22947] libc: FAIL: misc/tst-preadvwritev2
1705 [22963] localedata: cs_CZ: Add alternative month names
1706 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1707 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1708 [22998] dynamic-link: execstack tests are disabled when SELinux is
1710 [23005] network: Crash in __res_context_send after memory allocation
1712 [23007] math: strtod cannot handle -nan
1713 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1714 [23036] regex: regex equivalence class regression
1715 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1716 [23069] libc: sigaction broken on riscv64-linux-gnu
1717 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1718 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1719 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1720 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1721 and libc build with -Os)
1722 [23140] localedata: More languages need two forms of month names
1723 [23145] libc: _init/_fini aren't marked as hidden
1724 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1725 [23171] math: C++ iseqsig for long double converts arguments to double
1726 [23178] nscd: sudo will fail when it is run in concurrent with commands
1727 that changes /etc/passwd
1728 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1730 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1731 [23208] localedata: New locale - Lower Sorbian (dsb)
1732 [23233] regex: Memory leak in build_charclass_op function in file
1734 [23236] stdio: Harden function pointers in _IO_str_fields
1735 [23250] nptl: Offset of __private_ss differs from GCC
1736 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1737 -mtune=generic -mfpmath=sse
1738 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1740 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1741 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1743 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1744 [23277] math: nan function should not have const attribute
1745 [23279] math: scanf and strtod wrong for some hex floating-point
1746 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1748 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1749 [23303] build: undefined reference to symbol
1750 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1751 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1753 [23313] stdio: libio vtables validation and standard file object
1755 [23329] libc: The __libc_freeres infrastructure is not properly run across
1757 [23349] libc: Various glibc headers no longer compatible with
1759 [23351] malloc: Remove unused code related to heap dumps and malloc
1761 [23363] stdio: stdio-common/tst-printf.c has non-free license
1762 [23396] regex: Regex equivalence regression in single-byte locales
1763 [23422] localedata: oc_FR: More updates of locale data
1764 [23442] build: New warning with GCC 8
1765 [23448] libc: Out of bounds access in IBM-1390 converter
1766 [23456] libc: Wrong index_cpu_LZCNT
1767 [23458] build: tst-get-cpu-features-static isn't added to tests
1768 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1770 [23467] dynamic-link: x86/CET: A property note parser bug
1777 * The GNU C Library can now be compiled with support for building static
1778 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1779 executables are like static executables but can be loaded at any address
1780 and provide additional security hardening benefits at the cost of some
1781 memory and performance. When the library is built with --enable-static-pie
1782 the resulting libc.a is usable with GCC 8 and above to create static PIE
1783 executables using the GCC option '-static-pie'. This feature is currently
1784 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1785 aarch64 with binutils 2.30 or later.
1787 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1788 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1791 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1793 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1795 * In order to support faster and safer process termination the malloc API
1796 family of functions will no longer print a failure address and stack
1797 backtrace after detecting heap corruption. The goal is to minimize the
1798 amount of work done after corruption is detected and to avoid potential
1799 security issues in continued process execution. Reducing shutdown time
1800 leads to lower overall process restart latency, so there is benefit both
1801 from a security and performance perspective.
1803 * The abort function terminates the process immediately, without flushing
1804 stdio streams. Previous glibc versions used to flush streams, resulting
1805 in deadlocks and further data corruption. This change also affects
1806 process aborts as the result of assertion failures.
1808 * On platforms where long double has the IEEE binary128 format (aarch64,
1809 alpha, mips64, riscv, s390 and sparc), the math library now implements
1810 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1811 These are the same interfaces added in version 2.26 for some platforms where
1812 this format is supported but is not the format of long double.
1814 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1815 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1816 implements interfaces for that type, as defined by ISO/IEC TS
1817 18661-3:2015. These are corresponding interfaces to those supported for
1820 * The math library now implements interfaces for the _Float32, _Float64 and
1821 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1822 corresponding interfaces to those supported for _Float128.
1824 * glibc now implements the memfd_create and mlock2 functions on Linux.
1826 * Support for memory protection keys was added. The <sys/mman.h> header now
1827 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1830 * The copy_file_range function was added.
1832 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1834 * The ldconfig utility now processes `include' directives using the C/POSIX
1835 collation ordering. Previous glibc versions used locale-specific
1836 ordering, the change might break systems that relied on that.
1838 * Support for two grammatical forms of month names has been added.
1839 In a call to strftime, the "%B" and "%b" format specifiers will now
1840 produce the grammatical form required when the month is used as part
1841 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1842 required when the month is named by itself. For instance, in Greek
1843 and in many Slavic and Baltic languages, "%B" will produce the month
1844 in genitive case, and "%OB" will produce the month in nominative case.
1846 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1847 are all valid and will all accept any known form of month
1848 name---standalone or complete, abbreviated or full. In a call to
1849 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1850 the strings used by "%B" and "%b", respectively. New query
1851 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1852 used by "%OB" and "%Ob", respectively.
1854 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1855 define the strings for %OB and %Ob, respectively; these have the
1856 same syntax as "mon" and "abmon". These arrays are optional; if they
1857 are not provided then they have the same content as "mon" and "abmon",
1860 These features are provided for locales which define "alt_mon" and/or
1861 "ab_alt_mon" in their locale source data. This release includes such
1862 alternative month name data for the following languages: Belarusian,
1863 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1865 This feature is currently a GNU extension, but it is expected to
1866 be added to the next revision of POSIX, and it is also already
1867 available on some BSD-derived operating systems.
1869 This feature will cause existing statically compiled applications
1870 to fail to load locales and fall back to the builtin C/POSIX locales.
1871 See notes below for other changes affecting compatibility.
1873 * Support for the RISC-V ISA running on Linux has been added. This port
1874 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1875 for the following ISA and ABI pairs:
1881 Deprecated and removed features, and other changes affecting compatibility:
1883 * Statically compiled applications attempting to load locales compiled for the
1884 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1885 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1886 support for two grammatical forms of the month names, also extends the locale
1887 data binary format. Static applications needing locale support must be
1888 recompiled to match the runtime and data they are deployed with. In some
1889 distributions there is an upgrade window where dynamically linked applications
1890 may use a new library but the old locale data and also fall back to the
1891 builtin C/POSIX locales; restarting the application process is sufficient to
1894 * Support for statically linked applications which call dlopen is deprecated
1895 and will be removed in a future version of glibc. Applications which call
1896 dlopen need to be linked dynamically instead.
1898 * Support for old programs which use internal stdio data structures and
1899 functions is deprecated. This includes programs which use the C++ streams
1900 provided by libstdc++ in GCC 2.95. Programs which use the internal
1901 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1902 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1903 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1904 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1905 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1906 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1907 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1908 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1909 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1910 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1911 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1912 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1913 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1914 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1915 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1916 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1917 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1918 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1919 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1920 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1921 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1922 future version of glibc. Unlike other symbol removals, these old
1923 applications will not be supported using compatibility symbols.
1925 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1926 defined by <sys/ptrace.h>.
1928 * libm no longer supports SVID error handling (calling a user-provided
1929 matherr function on error) or the _LIB_VERSION variable to control error
1930 handling. (SVID error handling and the _LIB_VERSION variable still work
1931 for binaries linked against older versions of the GNU C Library.) The
1932 libieee.a library is no longer provided. math.h no longer defines struct
1933 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1934 TLOSS, PLOSS and HUGE.
1936 * The libm functions pow10, pow10f and pow10l are no longer supported for
1937 new programs. Programs should use the standard names exp10, exp10f and
1938 exp10l for these functions instead.
1940 * The mcontext_t type is no longer the same as struct sigcontext. On
1941 platforms where it was previously the same, this changes the C++ name
1942 mangling for interfaces involving this type.
1944 * The add-ons mechanism for building additional packages at the same time as
1945 glibc has been removed. The --enable-add-ons configure option is now
1948 * The --without-fp configure option is now ignored. Whether hardware
1949 floating-point instructions are used is now configured based on whether
1950 the compiler used at configure time (without any options implied by a
1951 --with-cpu= configure option) uses such instructions.
1953 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1954 the specified string can be parsed as a domain name.
1956 * In the malloc_info output, the <heap> element may contain another <aspace>
1957 element, "subheaps", which contains the number of sub-heaps.
1959 * The libresolv function p_secstodate is no longer supported for new
1962 * The tilepro-*-linux-gnu configuration is no longer supported.
1964 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1965 and will be removed in a future release. Software that is still using
1966 either header should be updated to use standard <stdio.h> interfaces
1969 libio.h was originally the header for a set of supported GNU extensions,
1970 but they have not been maintained as such in many years, they are now
1971 standing in the way of improvements to stdio, and we don't think there are
1972 any remaining external users. _G_config.h was never intended for public
1973 use, but predates the bits convention.
1975 Changes to build and runtime requirements:
1977 * bison version 2.7 or later is required to generate code in the 'intl'
1980 Security related changes:
1982 CVE-2009-5064: The ldd script would sometimes run the program under
1983 examination directly, without preventing code execution through the
1984 dynamic linker. (The glibc project disputes that this is a security
1985 vulnerability; only trusted binaries must be examined using the ldd
1988 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1989 suffered from a one-byte overflow during ~ operator processing (either
1990 on the stack or the heap, depending on the length of the user name).
1991 Reported by Tim Rühsen.
1993 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1994 would sometimes fail to free memory allocated during ~ operator
1995 processing, leading to a memory leak and, potentially, to a denial
1998 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1999 without GLOB_NOESCAPE, could write past the end of a buffer while
2000 unescaping user names. Reported by Tim Rühsen.
2002 CVE-2017-17426: The malloc function, when called with an object size near
2003 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2004 instead of NULL. This was a regression introduced with the new malloc
2005 thread cache in glibc 2.26. Reported by Iain Buclaw.
2007 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2008 to the allocation of too much memory. (This is not a security bug per se,
2009 it is mentioned here only because of the CVE assignment.) Reported by
2012 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2013 of the number of search path components. (This is not a security
2014 vulnerability per se because no trust boundary is crossed if the fix for
2015 CVE-2017-1000366 has been applied, but it is mentioned here only because
2016 of the CVE assignment.) Reported by Qualys.
2018 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2019 for AT_SECURE or SUID binaries could be used to load libraries from the
2022 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2023 succeeds without returning an absolute path due to unexpected behaviour
2024 of the Linux kernel getcwd syscall. Reported by halfdog.
2026 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2027 an object size near the value of SIZE_MAX, would return a pointer to a
2028 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2030 CVE-2018-6551: The malloc function, when called with an object size near
2031 the value of SIZE_MAX, would return a pointer to a buffer which is too
2032 small, instead of NULL.
2034 The following bugs are resolved with this release:
2036 [866] glob: glob should match dangling symlinks
2037 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2038 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2040 [5997] math: Very slow execution of sinf function
2041 [10580] localedata: hr_HR: updated locale
2042 [10871] locale: 'mon' array should contain both nominative and genitive
2044 [12349] localedata: eu_ES: incorrect thousands separator
2045 [13605] localedata: shn_MM: new Shan locale
2046 [13805] localedata: ru_RU: currency should use ',' as radix point
2047 [13953] localedata: km_KH: locale update
2048 [13994] localedata: mjw_IN: new locale
2049 [14121] build: make writes .mo files in po directory
2050 [14333] libc: Fix the race between atexit() and exit()
2051 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2052 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2054 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2055 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2056 width Latin characters
2057 [15332] localedata: es_CU: locale update
2058 [15436] stdio: Don't close or flush stdio streams on abort
2059 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2061 [16148] localedata: ca_ES: incorrect thousands separator
2062 [16750] dynamic-link: ldd should not try to execute the binaries
2064 [16777] localedata: pl_PL: incorrect thousands separator in locale
2065 [16905] localedata: hanzi: new collation
2066 [17563] localedata: cmn_TW: add hanzi collation
2067 [17750] localedata: wrong collation order of diacritics in most locales
2068 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2070 [17956] build: Build fails on missing definitions from header file
2071 nss/nss.h when Mozilla NSS is used for cryptography
2072 [18203] libc: realpath() does not handle unreachable paths correctly
2073 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2074 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2075 [18822] libc: Internal functions are called via PLT
2076 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2077 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2078 [19574] libc: glibc should support building static PIE binaries
2079 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2081 [19971] glob: glob: Do not skip entries with zero d_ino values
2082 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2083 [20008] localedata: km_KH: convert to translit_neutral
2084 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2085 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2086 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2087 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2088 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2090 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2091 they're set, wrong errors returned by gaih_inet when lookup functions
2093 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2094 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2096 [20952] localedata: yuw_PG: new locale
2097 [21084] localedata: charmaps/IBM858: new codepage
2098 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2099 [21242] libc: assert gives pedantic warning in old gcc versions
2100 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2101 __regcall calling convention
2102 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2103 [21326] libc: C99 functions are not declared for C++11 and later if
2104 _GNU_SOURCE is not predefined by g++
2105 [21457] libc: sys/ucontext.h namespace
2106 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2107 [21660] math: GCC fails to compile a formula with tgmath.h
2108 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2109 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2110 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2111 [21684] math: tgmath.h handling of complex integers
2112 [21685] math: tgmath.h handling of bit-fields
2113 [21686] math: tgmath.h handling of __int128
2114 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2116 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2118 [21750] localedata: column width of characters incompatible with classical
2120 [21754] malloc: malloc: Perform as little work as possible after heap
2121 consistency check failures
2122 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2123 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2124 [21791] string: Unused XXX_chk_XXX functions in libc.a
2125 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2127 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2129 [21845] localedata: Added new Locale bho_NP
2130 [21853] localedata: Fix abday Which looks same as day in zh_SG
2131 [21854] localedata: Added New Locale en_SC
2132 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2133 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2134 _dl_runtime_resolve_avx_slow
2135 [21885] network: getaddrinfo: gethosts does not release resolver context
2136 on memory allocation failure
2137 [21899] libc: XPG4.2 sigaction namespace
2138 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2140 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2142 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2143 errno value, causing getaddrinfo to fail
2144 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2145 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2146 instead of EAI_NODATA
2147 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2148 constant PTRACE_SEIZE_DEVEL
2149 [21930] math: C-only gcc builtins used in <math.h> isinf
2150 [21932] network: Unpaired __resolv_context_get in generic get*_r
2152 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2153 [21944] libc: sigval namespace
2154 [21951] localedata: Update hanzi collation by stroke
2155 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2156 sysdeps/x86_64/fpu/e_expf.S
2157 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2158 allocation in syscall loops)
2159 [21959] localedata: Fix Country name for xh_ZA
2160 [21960] localedata: Fix abmon for bem_ZM
2161 [21966] math: AVX2 mathvec functions use FMA without checking
2162 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2163 [21971] localedata: Added New Locale for mfe_MU
2164 [21972] libc: assert macro requires operator== (int) for its argument type
2165 [21973] math: [sparc] libm missing sqrtl compat symbol
2166 [21974] libc: Remove __bb_init_func and __bb_exit_func
2167 [21982] string: stratcliff.c: error: assuming signed overflow does not
2169 [21986] stdio: __guess_grouping is called incorrectly
2170 [21987] math: [sparc32] wrong bits/long-double.h installed
2171 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2173 [22022] localedata: Missing country_name for mni_IN
2174 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2176 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2178 [22026] locale: iconv_open: heap overflow on gconv_init failure
2179 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2180 [22035] math: [m68k] bits/math-inline.h macro namespace
2181 [22038] localedata: Fix abbreviated weeks and months for Somali
2182 [22044] localedata: Remove redundant data for Limburgish Language
2183 [22050] malloc: Linking with -lmcheck does not hook
2184 __malloc_initialize_hook correctly
2185 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2186 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2187 [22070] localedata: charmaps/UTF-8: wcwidth for
2188 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2189 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2190 Jungseong and Jongseong) should be 0
2191 [22078] nss: nss_files performance issue in multi mode
2192 [22082] math: bits/math-finite.h exp10 condition
2193 [22086] libc: pcprofiledump incorrect cross-endian condition
2194 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2195 [22095] network: Name server address allocation memory leak in resolv.conf
2197 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2199 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2200 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2202 [22111] malloc: malloc: per thread cache is not returned when thread exits
2203 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2204 [22134] libc: [linux] implement fexecve with execveat
2205 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2207 [22145] libc: ttyname() gives up too early in the face of namespaces
2208 [22146] math: C++ build issue with float128 on x86_64
2209 [22153] nptl: nptl: save error code before process termination
2210 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2211 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2212 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2213 [22165] libc: [hppa] Text relocations in libc.so
2214 [22180] libc: destructor registered via __cxa_atexit is called twice
2215 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2216 symlinks") cause "make" segfaults
2217 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2219 [22207] libc: FAIL: stdlib/test-atexit-race
2220 [22225] math: nearbyint arithmetic moved before feholdexcept
2221 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2222 [22235] math: iscanonical in C++ and float128
2223 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2224 the svid compat wrapper
2225 [22244] math: ynf and yn are wrong without the svid compat wrapper
2226 [22273] libc: Improper assert in Linux posix_spawn implementation
2227 [22284] libc: -pg -pie doesn't work
2228 [22292] locale: localedef exits with error 4 when it should be error 1
2229 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2230 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2232 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2233 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2235 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2236 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2237 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2238 [22322] libc: [mips64] wrong bits/long-double.h installed
2239 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2240 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2242 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2243 [22343] malloc: Integer overflow in posix_memalign
2244 [22347] libc: getrandom() returns the number of bytes that were copied to
2245 the buffer even though the comments say "Return 0 on success and -1 on
2247 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2248 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2250 [22370] dynamic-link: Incorrect note padding check
2251 [22375] libc: malloc returns pointer from tcache_get when should return
2252 NULL (CVE-2017-17426)
2253 [22377] math: iseqsig, float128 and C++
2254 [22382] localedata: Error in tpi_PG locale
2255 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2256 inside the ASCII printable range
2257 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2259 [22403] localedata: Slash needs escaping in some locales
2260 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2261 [22409] network: res_hnok does not accept some host names used on the
2263 [22412] network: res_dnok, res_hnok should perform syntax checks
2264 [22413] network: ns_name_pton ignores syntactically invalid trailing
2266 [22415] stdio: setvbuf can lead to invalid free/segfault
2267 [22432] build: Non-deterministic build
2268 [22439] malloc: malloc_info should compute summary statistics for all sub-
2270 [22442] network: if_nametoindex could report index for the wrong
2271 networking interface
2272 [22446] build: aliasing violation calling readlink in handle_request
2273 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2274 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2275 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2276 __nscd_hash/__nss_hash
2277 [22463] network: p_secstodate overflow handling
2278 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2279 [22478] libc: sigwait can fail with EINTR
2280 [22505] libc: ldconfig processes include directive in locale-specific
2282 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2283 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2284 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2285 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2286 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2287 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2288 same as for Croatian
2289 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2290 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2291 [22577] libc: missing newline after "cannot allocate TLS data structures
2293 [22588] manual: manual/conf.texi: missing underscore in front of
2295 [22593] math: nextafter and nexttoward are declared with const attribute
2296 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2297 [22603] string: ia64 memchr overflows internal pointer check
2298 [22605] libc: SH clone does not set the exit code correctly
2299 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2301 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2302 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2303 modified in case of success
2304 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2305 [22615] manual: manual: ambiguous wording about errno value in case of
2307 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2309 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2310 binaries or if /proc is not mounted (CVE-2017-16997)
2311 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2312 [22630] build: $(no-pie-ldflag) is no longer effective
2313 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2314 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2315 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2316 [22637] nptl: guard size is subtracted from thread stack size instead of
2318 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2319 [22657] localedata: hu_HU: Avoid double space in date
2320 [22660] math: fmax, fmin sNaN handling on alpha
2321 [22664] libc: New warning of GCC8
2322 [22665] math: alpha: ceil and floor raise inexact exceptions
2323 [22666] math: alpha: trunc raise inexact exceptions
2324 [22667] libc: makecontext lacks stack alignment on i386
2325 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2326 [22679] libc: getcwd(3) can succeed without returning an absolute path
2328 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2329 elision and tunables
2330 [22687] math: [powerpc-nofpu] complex long double functions spurious
2332 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2333 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2334 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2336 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2337 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2339 [22701] nis: Incomplete removal of libnsl
2340 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2341 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2342 [22715] dynamic-link: FAIL: elf/tst-audit10
2343 [22719] libc: Backtrace tests fail on hppa
2344 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2345 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2346 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2347 before the first call to crypt_r () in crypt/badsalttest.c
2354 * A per-thread cache has been added to malloc. Access to the cache requires
2355 no locks and therefore significantly accelerates the fast path to allocate
2356 and free small amounts of memory. Refilling an empty cache requires locking
2357 the underlying arena. Performance measurements show significant gains in a
2358 wide variety of user workloads. Workloads were captured using a special
2359 instrumented malloc and analyzed with a malloc simulator. Contributed by
2360 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2362 * Unicode 10.0.0 Support: Character encoding, character type info, and
2363 transliteration tables are all updated to Unicode 10.0.0, using
2364 generator scripts contributed by Mike FABIAN (Red Hat).
2365 These updates cause user visible changes, especially the changes in
2366 wcwidth for many emoji characters cause problems when emoji sequences
2367 are rendered with pango, see for example:
2368 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2370 * Collation of Hungarian has been overhauled and is now consistent with "The
2371 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2374 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2376 - The GNU C Library will now detect when /etc/resolv.conf has been
2377 modified and reload the changed configuration. The new resolver option
2378 “no-reload” (RES_NORELOAD) disables this behavior.
2380 - The GNU C Library now supports an arbitrary number of search domains
2381 (configured using the “search” directive in /etc/resolv.conf);
2382 previously, there was a hard limit of six domains. For backward
2383 compatibility, applications that directly modify the ‘_res’ global
2384 object are still limited to six search domains.
2386 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2387 Library will now randomly pick a name server from the configuration as a
2388 starting point. (Previously, the second name server was always used.)
2390 * The tunables feature is now enabled by default. This allows users to tweak
2391 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2393 * New function reallocarray, which resizes an allocated block (like realloc)
2394 to the product of two sizes, with a guaranteed clean failure upon integer
2395 overflow in the multiplication. Originally from OpenBSD, contributed by
2396 Dennis Wölfing and Rüdiger Sonderfeld.
2398 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2399 These are extended versions of preadv and pwritev, respectively, taking an
2400 additional flags argument. The set of supported flags depends on the
2401 running kernel; full support currently requires kernel 4.7 or later.
2403 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2404 create a new session ID for the spawned process. This feature is
2405 scheduled to be added to the next major revision of POSIX; for the time
2406 being, it is available under _GNU_SOURCE.
2408 * errno.h is now safe to use from C-preprocessed assembly language on all
2409 supported operating systems. In this context, it will only define the
2410 Exxxx constants, as preprocessor macros expanding to integer literals.
2412 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2413 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2414 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2415 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2417 To compile programs that use this feature, the compiler must support
2418 128-bit floating point with the type name _Float128 (as defined by TS
2419 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2420 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2421 must be defined to make the new interfaces visible.
2423 The new functions and macros correspond to those present for other
2424 floating-point types (except for a few obsolescent interfaces not
2425 supported for the new type), with F128 or f128 suffixes; for example,
2426 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2427 printf or scanf formats for the new type; the strfromf128 and strtof128
2428 interfaces should be used instead.
2430 Deprecated and removed features, and other changes affecting compatibility:
2432 * The synchronization that pthread_spin_unlock performs has been changed to
2433 now be equivalent to a C11 atomic store with release memory order to the
2434 spin lock's memory location. Previously, several (but not all)
2435 architectures used stronger synchronization (e.g., containing what is
2436 often called a full barrier). This change can improve performance, but
2437 may affect odd fringe uses of spin locks that depend on the previous
2438 behavior (e.g., using spin locks as atomic variables to try to implement
2439 Dekker's mutual exclusion algorithm).
2441 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2444 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2445 will only be built and installed when the GNU C Library is configured with
2446 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2447 as TIRPC or rpcsvc-proto, to be used.
2449 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2450 libnss_compat, are deprecated, and will not be built or installed by
2453 The NIS(+) support library, libnsl, is also deprecated. By default, a
2454 compatibility shared library will be built and installed, but not headers
2455 or development libraries. Only a few NIS-related programs require this
2456 library. (In particular, the GNU C Library has never required programs
2457 that use 'gethostbyname' to be linked with libnsl.)
2459 Replacement implementations based on TIRPC, which additionally support
2460 IPv6, are available from <https://github.com/thkukuk/>. The configure
2461 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2462 name service modules, to be built and installed.
2464 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2465 support is enabled, the configured recursive resolver must support EDNS.
2466 (Responding to EDNS-enabled queries with responses which are not
2467 EDNS-enabled is fine, but FORMERR responses are not.)
2469 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2470 servers have not supported this opcode for a long time.
2472 * The _res_opcodes variable has been removed from libresolv. It had been
2473 exported by accident.
2475 * <string.h> no longer includes inline versions of any string functions,
2476 as this kind of optimization is better done by the compiler. The macros
2477 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2479 * The nonstandard header <xlocale.h> has been removed. Most programs should
2480 use <locale.h> instead. If you have a specific need for the definition of
2481 locale_t with no other declarations, please contact
2482 libc-alpha@sourceware.org and explain.
2484 * The obsolete header <sys/ultrasound.h> has been removed.
2486 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2488 * The obsolete function cfree has been removed. Applications should use
2491 * The stack_t type no longer has the name struct sigaltstack. This changes
2492 the C++ name mangling for interfaces involving this type.
2494 * The ucontext_t type no longer has the name struct ucontext. This changes
2495 the C++ name mangling for interfaces involving this type.
2497 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2498 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2499 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2500 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2501 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2502 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2503 fpregset_t type no longer has the name struct fpu. This changes the C++
2504 name mangling for interfaces involving those types.
2506 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2507 synced with the kernel:
2509 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2510 are not supported on this architecture and have been removed.
2512 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2513 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2514 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2516 Programs that assume the GET/SETREGS ptrace requests are universally
2517 available will now fail to build, instead of malfunctioning at runtime.
2519 Changes to build and runtime requirements:
2521 * Linux kernel 3.2 or later is required at runtime, on all architectures
2522 supported by that kernel. (This is a change from version 2.25 only for
2525 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2527 * On most architectures, GCC 4.9 or later is required to build the GNU C
2528 Library. On powerpc64le, GCC 6.2 or later is required.
2530 Older GCC versions and non-GNU compilers are still supported when
2531 compiling programs that use the GNU C Library. (We do not know exactly
2532 how old, and some GNU extensions to C may be _de facto_ required. If you
2533 are interested in helping us make this statement less vague, please
2534 contact libc-alpha@sourceware.org.)
2536 Security related changes:
2538 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2539 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2541 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2542 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2544 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2545 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2548 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2549 fixed (CVE-2017-12133).
2551 The following bugs are resolved with this release:
2553 [984] network: Respond to changed resolv.conf in gethostbyname
2554 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2555 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2557 [12189] libc: __stack_chk_fail should not attempt a backtrace
2559 [14096] time: Race condition on timezone/tst-timezone.out
2560 [14172] localedata: az_IR: new locale
2561 [14995] build: glibc fails to build if gold is the default linker, even if
2563 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2564 [16637] network: inet_pton function is accepting IPv6 with bad format
2565 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2566 x86 and other generic code
2567 [16875] localedata: ko_KR: fix lang_name
2568 [17225] localedata: ar_SY: localized month names for May and June are
2570 [17297] localedata: da_DK: wrong date_fmt string
2571 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2572 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2573 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2574 [19066] localedata: ar_SA abbreviated day and month names are in English
2575 [19569] network: resolv: Support an arbitrary number of search domains
2576 [19570] network: Implement random DNS server selection in the stub
2578 [19838] locale: localedef fails on PA-RISC
2579 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2580 order of 0D36 and 0D37
2581 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2583 [20098] libc: FAIL: debug/backtrace-tst on hppa
2584 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2586 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2588 [20313] localedata: Update locale data to Unicode 9.0
2589 [20424] manual: Document how to provide a malloc replacement
2590 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2592 [20686] locale: Add el_GR@euro to SUPPORTED.
2593 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2594 failures consistently
2595 [21015] dynamic-link: Document and fix --enable-bind-now
2596 [21016] nptl: pthread_cond support is broken on hppa
2597 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2598 frame-pointer on i386
2599 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2601 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2602 [21088] libc: Build fails with --enable-static-nss
2603 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2604 generic c code is used
2605 [21109] libc: Tunables broken on big-endian
2606 [21112] math: powf has large ulp errors with base close to 1 and exponent
2608 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2610 [21120] malloc: glibc malloc is incompatible with GCC 7
2611 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2613 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2614 (-0.0) when linking with -lieee
2615 [21171] math: log10, log2 and lgamma return incorrect results
2616 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2617 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2618 [21207] localedata: ce_RU: update weekdays from CLDR
2619 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2620 [21217] localedata: Update months from CLDR-31
2621 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2622 [21243] libc: support_delete_temp_file should issue warning for failed
2624 [21244] libc: support resolv_test_start() socket fd close should be
2626 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2627 new posix_spawn implementation
2628 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2629 leads to lower CPU frequency
2630 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2631 [21261] libc: [sparc64] bits/setjmp.h namespace
2632 [21267] network: [mips] bits/socket.h IOC* namespace
2633 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2634 [21270] libc: mmap64 silently truncates large offset values
2635 [21275] libc: posix_spawn always crashes on ia64 now
2636 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2637 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2638 [21289] libc: Incorrect declaration for 32-bit platforms with
2639 _FILE_OFFSET_BITS=64 causes build error
2640 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2641 not support gethostbyname4_r
2642 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2644 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2646 [21340] libc: Support POSIX_SPAWN_SETSID
2647 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2648 [21359] network: ns_name_pack needs additional byte in destination buffer
2649 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2650 against fragmentation attacks (CVE-2017-12132)
2651 [21369] network: resolv: Remove EDNS fallback
2652 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2654 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2655 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2656 [21393] stdio: Missing dup3 error check in freopen, freopen64
2657 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2658 [21399] localedata: Bad description for U00EC in
2659 localedata/charmaps/CP1254
2660 [21411] malloc: realloc documentation error
2661 [21426] network: sys/socket.h uio.h namespace
2662 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2663 [21445] libc: signal.h bsd_signal namespace
2664 [21455] network: Network headers stdint.h namespace
2665 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2667 [21475] network: resolv: Overlong search path is truncated mid-label
2668 [21511] libc: sigstack namespace
2669 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2670 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2671 bits/syscall.h: No such file or directory
2672 [21517] libc: struct sigaltstack namespace
2673 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2674 [21533] localedata: Update locale data to Unicode 10.0
2676 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2677 junk at end of line, first unrecognized character is `@'
2678 [21538] libc: SIG_HOLD missing for XPG4
2679 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2680 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2681 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2682 [21543] libc: sigevent namespace
2683 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2684 size for general purpose registers in mcontext_t structure
2685 [21550] libc: sigwait namespace
2686 [21552] libc: XPG4 bsd_signal namespace
2687 [21554] libc: sigpause namespace
2688 [21560] libc: sys/wait.h signal.h namespace
2689 [21561] libc: waitid namespace
2690 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2691 '/usr/include/stdlib.h': Permission denied
2692 [21575] libc: sys/wait.h missing struct rusage definition
2693 [21584] libc: sigaltstack etc namespace
2694 [21597] libc: siginterrupt namespace
2695 [21607] math: hppa: FAIL: math/test-tgmath
2696 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2698 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2699 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2700 stack and heap (CVE-2017-1000366)
2701 [21625] libc: wait3 namespace
2702 [21654] nss: Incorrect pointer alignment in NSS group merge result
2704 [21657] network: Parse interface zone id for node-local multicast
2705 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2707 [21666] libc: .symver is used on common symbol
2708 [21668] network: resolv: res_init cross-thread broadcast introduces race
2710 [21687] math: tgmath.h totalorder, totalordermag return type
2711 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2713 [21696] libc: Incorrect assumption of of __cpu_mask in
2714 posix/sched_cpucount.c
2715 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2716 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2718 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2719 leading to relocation crash
2720 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2721 `resolv_conf_matches (resp, conf)' failed.
2722 [21710] localedata: Added Samoan language locale for Samoa
2723 [21711] localedata: Pashto yesstr/nostr locale are missing
2724 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2725 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2726 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2727 [21723] localedata: yesstr/nostr missing for Chinese language locale
2728 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2730 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2732 [21728] localedata: New Locale for Tongan language
2733 [21729] localedata: incorrect LC_NAME fields for hi_IN
2734 [21733] localedata: yesstr and nostr are missing for zh_HK
2735 [21734] localedata: Missing yesstr and nostr are for kw_GB
2736 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2737 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2738 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2739 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2741 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2743 [21749] localedata: Wrong abbreviated day name (“abday”) for
2745 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2746 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2747 [21759] localedata: missing yesstr and nostr for Tigrinya
2748 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2749 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2750 [21767] localedata: Missing Bislama locales
2751 [21768] localedata: Missing yesstr and nostr for aa_ET
2752 [21770] localedata: Missing Field in li_NL
2753 [21778] nptl: Robust mutex may deadlock
2754 [21779] libc: MicroBlaze segfaults when loading libpthread
2755 [21783] localedata: Fix int_select international_call_prefixes
2756 [21784] localedata: Inconsistency in country_isbn
2757 [21788] localedata: Missing Country Postal Abbreviations
2758 [21794] localedata: Added-country_isbn-for-Italy
2759 [21795] localedata: Add/Fix country_isbn for France
2760 [21796] localedata: Added country_isbn for Republic of Korea
2761 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2762 [21799] localedata: Added int_select international_call_prefixes
2763 [21801] localedata: Added int_select international_call_prefixes
2764 [21804] nptl: Double semicolon in thread-shared-types.h
2765 [21807] localedata: LC_ADDRESS fix for pap_CW
2766 [21808] localedata: Fix LC_ADDRESS for pap_AW
2767 [21821] localedata: Added country_name in mai_IN
2768 [21822] localedata: Fix LC_TIME for mai_IN
2769 [21823] localedata: missing yesstr, nostr for sa_IN
2770 [21825] localedata: Fix name_mrs for mag_IN
2771 [21828] localedata: 2.26 changelog should mention user visible changes
2773 [21835] localedata: Added Maithili language locale for Nepal
2774 [21838] localedata: Removed redundant data for the_NP
2775 [21839] localedata: Fix LC_MONETARY for ta_LK
2776 [21844] localedata: Fix Latin characters and Months Sequence.
2777 [21848] localedata: Fix mai_NP Title Name
2782 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2783 24731-2:2010, is supported to enable declarations of functions from that
2784 TR. Note that not all functions from that TR are supported by the GNU C
2787 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2788 18661-1:2014, is supported to enable declarations of functions and macros
2789 from that TS. Note that not all features from that TS are supported by
2792 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2793 18661-4:2015, is supported to enable declarations of functions and macros
2794 from that TS. Note that most features from that TS are not supported by
2797 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2798 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2799 Since the GNU C Library defaults to a much newer revision of POSIX, this
2800 will only affect programs that specifically request an old conformance
2801 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2802 see a change in the visible declarations, but a program compiled with
2803 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2806 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2807 defined by all multithreaded code, but glibc has not required this for
2810 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2811 means that in a future release, the macros “major”, “minor”, and “makedev”
2812 will only be available from <sys/sysmacros.h>.
2814 These macros are not part of POSIX nor XSI, and their names frequently
2815 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2816 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2817 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2820 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2821 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2822 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2824 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2825 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2826 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2827 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2828 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2829 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2830 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2831 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2832 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2833 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2834 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2837 * New <math.h> features are added from TS 18661-1:2014:
2839 - Signaling NaN macros: SNANF, SNAN, SNANL.
2841 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2842 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2843 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2845 - llogb functions: the llogb, llogbf and llogbl functions, and the
2846 FP_LLOGB0 and FP_LLOGBNAN macros.
2848 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2851 - Comparison macros: iseqsig.
2853 - Classification macros: iscanonical, issubnormal, iszero.
2855 - Total order functions: totalorder, totalorderf, totalorderl,
2856 totalordermag, totalordermagf, totalordermagl.
2858 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2860 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2861 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2863 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2864 are added to libc. They convert a floating-point number into string.
2866 * Most of glibc can now be built with the stack smashing protector enabled.
2867 It is recommended to build glibc with --enable-stack-protector=strong.
2868 Implemented by Nick Alcock (Oracle).
2870 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2871 intended to be used instead of memset() to erase sensitive data after use;
2872 the compiler will not optimize out calls to explicit_bzero even if they
2873 are "unnecessary" (in the sense that no _correct_ program can observe the
2874 effects of the memory clear).
2876 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2877 to float instead of double. This does not affect the ABI of any libraries
2878 that are part of the GNU C Library, but may affect the ABI of other
2879 libraries that use this type in their interfaces.
2881 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2882 float_t and double_t types are now defined to long double instead of float
2883 and double. These options are not the default, and this does not affect
2884 the ABI of any libraries that are part of the GNU C Library, but it may
2885 affect the ABI of other libraries that use this type in their interfaces,
2886 if they are compiled or used with those options.
2888 * The getentropy and getrandom functions, and the <sys/random.h> header file
2891 * The buffer size for byte-oriented stdio streams is now limited to 8192
2892 bytes by default. Previously, on Linux, the default buffer size on most
2893 file systems was 4096 bytes (and thus remains unchanged), except on
2894 network file systems, where the buffer size was unpredictable and could be
2895 as large as several megabytes.
2897 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2898 for the Linux quota interface which predates kernel version 2.4.22 has
2901 * The malloc_get_state and malloc_set_state functions have been removed.
2902 Already-existing binaries that dynamically link to these functions will
2903 get a hidden implementation in which malloc_get_state is a stub. As far
2904 as we know, these functions are used only by GNU Emacs and this change
2905 will not adversely affect already-built Emacs executables. Any undumped
2906 Emacs executables, which normally exist only during an Emacs build, should
2907 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2909 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2910 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2911 “no-ip6-dotint” had already been the default, and support for the
2912 “ip6-dotint” option was removed from the Internet in 2006.
2914 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2915 flag from <resolv.h> have been removed. The option relied on a
2916 backwards-incompatible DNS extension which was never deployed on the
2919 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2920 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2921 They were already unimplemented.
2923 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2924 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2925 removed again from the IETF name lookup interface specification in RFC
2926 2553. Applications should use getaddrinfo instead.
2928 * DNSSEC-related declarations and definitions have been removed from the
2929 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2930 decode the data part of DNSSEC record types. Previous versions of glibc
2931 only implemented minimal support for the previous version of DNSSEC, which
2932 is incompatible with the currently deployed version.
2934 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2935 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2936 <arpa/nameser.h> header file because the distinction between RR types and
2937 meta-RR types is not officially standardized, subject to revision, and
2938 thus not suitable for encoding in a macro.
2940 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2941 and rhook members of the res_state type in <resolv.h> have been removed.
2942 The glibc stub resolver did not support these hooks, but the header file
2943 did not reflect that.
2945 * For multi-arch support it is recommended to use a GCC which has
2946 been built with support for GNU indirect functions. This ensures
2947 that correct debugging information is generated for functions
2948 selected by IFUNC resolvers. This support can either be enabled by
2949 configuring GCC with '--enable-gnu-indirect-function', or by
2950 enabling it by default by setting 'default_gnu_indirect_function'
2951 variable for a particular architecture in the GCC source file
2954 * GDB pretty printers have been added for mutex and condition variable
2955 structures in POSIX Threads. When installed and loaded in gdb these pretty
2956 printers show various pthread variables in human-readable form when read
2957 using the 'print' or 'display' commands in gdb.
2959 * Tunables feature added to allow tweaking of the runtime for an application
2960 program. This feature can be enabled with the '--enable-tunables' configure
2961 flag. The GNU C Library manual has details on usage and README.tunables has
2962 instructions on adding new tunables to the library.
2964 * A new version of condition variables functions have been implemented in
2965 the NPTL implementation of POSIX Threads to provide stronger ordering
2968 * A new version of pthread_rwlock functions have been implemented to use a more
2969 scalable algorithm primarily through not using a critical section anymore to
2972 Security related changes:
2974 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2975 have been created with makecontext could fail to terminate due to a
2976 missing .cantunwind annotation. This has been observed to lead to a hang
2977 (denial of service) in some Go applications compiled with gccgo. Reported
2978 by Andreas Schwab. (CVE-2016-6323)
2980 * The DNS stub resolver functions would crash due to a NULL pointer
2981 dereference when processing a query with a valid DNS question type which
2982 was used internally in the implementation. The stub resolver now uses a
2983 question type which is outside the range of valid question type values.
2986 The following bugs are resolved with this release:
2988 [4099] stdio: Overly aggressive caching by stream i/o functions.
2989 [7065] build: Support building glibc with -fstack-protector or -fstack-
2991 [9842] localedata: en_CA: incorrect date format
2992 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2993 before it started waiting
2994 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2995 [15765] nptl: sem_open is wrongly a cancellation point
2996 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2997 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2999 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3000 library linked with pthread
3001 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3002 "FIXME: Ingo" issue)
3003 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3004 [17252] libc: getrandom and getentropy syscall
3005 [17730] malloc: thread-local storage is sometimes improperly free()'d
3006 after being __libc_memalign()'d
3007 [18241] stdio: failed fseek on memstream does not set errno and can fail
3009 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3011 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3012 PTHREAD_PRIO_INHERIT mutex on ARM
3013 [18784] network: res_query and related function crash for special record
3014 type queries (CVE-2015-5180)
3015 [19380] math: strtod does not raise "inexact"
3016 [19387] string: Integer overflow in memchr
3017 [19390] string: Integer overflow in strncat
3018 [19398] build: linknamespace tests fail with massively parallel build
3019 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3021 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3022 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3023 [19514] libc: [PATCH] Fix spelling errors in spelling
3024 "implement"/"implementation" in several places
3025 [19582] network: Deprecate RES_USE_INET6
3026 [19673] manual: clog10 docs appear to be erroneous
3027 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3028 causes a segmentation fault
3029 [19826] libc: invalid pointer returned from __tls_get_addr with static
3031 [20016] network: resolv: Remove hooks support from the API
3032 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3034 [20033] math: [x86_64] vectorized math function don't call the __finite
3036 [20116] nptl: use after free in pthread_create
3037 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3038 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3040 [20311] nptl: please install proc_service.h
3041 [20366] libc: Compilation errors in installed headers in strict-compliance
3043 [20370] malloc: malloc: Arena free list management is still racy
3044 (incorrect fix in bug 19243)
3045 [20386] libc: assert (X = 0) does not result in GCC warning
3046 [20432] malloc: malloc: Minimize interface required for interposition
3047 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3048 in _Unwind_Backtrace (CVE-2016-6323)
3049 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3050 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3052 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3053 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3054 [20477] network: resolv: incorrect double-checked locking related to
3056 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3058 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3060 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3061 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3062 cause transition penalty
3063 [20517] math: sparcv9 missing fdiml compat symbol
3064 [20524] manual: strverscmp is inconsistent
3065 [20525] libc: <sys/quota.h> should be based on kernel headers
3066 [20539] math: GCC 7 -static -lm fails to link at -O3
3067 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3069 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3071 [20591] network: Remove obsolete DNSSEC support
3072 [20592] network: DNS resource record type classification macros in
3073 <arpa/nameser.h> are incorrect
3074 [20593] network: Update DNS RR type definitions
3075 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3076 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3078 [20629] network: libresolv: Remove support for bitstring labels
3080 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3081 assertion: "maxidx >= 2"
3082 [20660] math: [arm] Use VSQRT
3083 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3084 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3085 [20689] libc: Test for FMA should also check for AVX.
3086 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3087 [20715] math: iszero macro breaks existing code
3088 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3089 [20728] libc: powerpc: Missing TOC stub in clone
3090 [20729] build: glibc-2.24 fails to build for i486 with -Os
3091 [20750] build: Build fails with default PIE enabled gcc-6.x
3092 [20768] math: [alpha] sqrt fegetenv namespace
3093 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3095 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3096 __FLT_EVAL_METHOD__ is 2
3097 [20790] network: rpcgen buffer overrun in get_prog_declaration
3098 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3099 [20829] libc: crypt snprintf namespace
3100 [20847] libc: tst-vfork3 failure
3101 [20855] math: Default bits/mathdef.h has inappropriate float_t
3102 [20859] math: [sh4] FP_ILOGB0 invalid
3103 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3104 U+20AC), not same as GBK
3105 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3106 [20916] math: pow handling of sNaN arguments
3107 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3108 [20919] math: Bad pow (qNaN, 0) result with -lieee
3109 [20940] math: hypot sNaN handling
3110 [20947] math: fmax, fmin sNaN handling
3111 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3112 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3114 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3115 [20973] nptl: robust mutexes: Lost wake-ups
3116 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3117 [20978] nis: strlen on null pointer in nss_nisplus
3118 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3120 [21014] string: i686 memchr overflows internal pointer check
3121 [21019] libc: [mips] n32 lseek incorrect on overflow
3122 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3123 [21026] libc: [MIPS] readahead syscall is broken on n64
3124 [21028] math: Fallback fesetexceptflag should always succeed
3125 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3126 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3128 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3129 [21061] librt: [microblaze] librt lost clock_* exports
3130 [21073] libc: tunables: insecure environment variables passed to
3131 subprocesses with AT_SECURE
3132 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3136 * The minimum Linux kernel version that this version of the GNU C Library
3137 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3138 kernel version 2.6.32 or later suffices (on architectures that already
3139 required kernel versions more recent than 3.2, those requirements remain
3140 unchanged). Linux 3.2 or later kernel headers are required on all
3143 * The pap_AN locale has been deleted. This has been deprecated for a long
3144 time. It has been replaced by pap_AW & pap_CW, both of which have long
3145 been included in previous releases.
3147 * The readdir_r and readdir64_r functions have been deprecated. It is
3148 recommended to use readdir and readdir64 instead.
3150 * The type “union wait” has been removed. It was deprecated in the early
3151 1990s and never part of POSIX. Application code should use the int type
3152 instead of “union wait”.
3154 * A new NSS action is added to facilitate large distributed system
3155 administration. The action, MERGE, allows remote user stores like LDAP
3156 to be merged into local user stores like /etc/groups in order to provide
3157 easy to use, updated, and managed sets of merged credentials. The new
3158 action can be used by configuring it in /etc/nsswitch.conf:
3159 group: files [SUCCESS=merge] nis
3160 Implemented by Stephen Gallagher (Red Hat).
3162 * The deprecated __malloc_initialize_hook variable has been removed from the
3165 * The long unused localedef --old-style option has been removed. It hasn't
3166 done anything in over 16 years. Scripts using this option can safely
3169 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3170 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3171 return the next representable value in the direction of positive infinity
3172 and the nextdown functions return the next representable value in the
3173 direction of negative infinity. These are currently enabled as GNU
3176 Security related changes:
3178 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3179 could result in a stack overflow when getnetbyname was called with an
3180 overly long name. (CVE-2016-3075)
3182 * Previously, getaddrinfo copied large amounts of address data to the stack,
3183 even after the fix for CVE-2013-4458 has been applied, potentially
3184 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3185 instead. Reported by Michael Petlan. (CVE-2016-3706)
3187 * The glob function suffered from a stack-based buffer overflow when it was
3188 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3189 Reported by Alexander Cherepanov. (CVE-2016-1234)
3191 * The Sun RPC UDP client could exhaust all available stack space when
3192 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3193 alloca plugin for GCC. (CVE-2016-4429)
3195 * The IPv6 name server management code in libresolv could result in a memory
3196 leak for each thread which is created, performs a failing naming lookup,
3197 and exits. Over time, this could result in a denial of service due to
3198 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3200 The following bugs are resolved with this release:
3202 [1170] localedata: ne_NP: update Nepali locale definition file
3203 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3205 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3206 [6796] math: fdim() does not set errno on overflow
3207 [10354] libc: posix_spawn should use vfork() in more cases than presently
3208 [11213] localedata: localedata: add copyright disclaimer to locale files
3209 [12143] localedata: chr_US: new Cherokee locale
3210 [12450] localedata: sgs_LT: new locale
3211 [12676] localedata: ln_CD: new locale
3212 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3214 [13304] math: fma, fmaf, fmal produce wrong results
3215 [14259] build: --localedir arg to configure is ignored
3216 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3217 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3218 [14934] localedata: es_CL: wrong first weekday chilean locale
3219 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3221 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3223 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3224 [15368] nptl: raise() is not async-signal-safe
3225 [15479] math: ceil, floor, round and trunc raise inexact exception
3226 [15578] localedata: kk_KZ: various updates
3227 [16003] localedata: pap_AN: punt old locale
3228 [16137] localedata: iw_IL: punt old locale
3229 [16190] localedata: eo: new esperanto locale
3230 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3231 [16742] malloc: race condition: pthread_atfork() called before first
3232 malloc() results in unexpected locking behaviour/deadlocks
3233 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3235 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3236 [17565] localedata: pt_PT: wrong (work-)week start
3237 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3238 [17950] build: Build fails with -msse
3239 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3240 [18433] libc: posix_spawn does not return correctly upon failure to
3242 [18453] localedata: charmaps/IBM875: incorrect codes
3243 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3245 [18896] localedata: he_IL: improvements for currency
3246 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3247 Romanian locale data
3248 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3250 [19056] libc: Deprecate readdir_r
3251 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3253 [19198] localedata: nl_NL: small improvements for Dutch locales
3254 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3255 nameservers (CVE-2016-5417)
3256 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3258 [19400] locale: Language missing in "iso-639.def", trivial fix in
3260 [19431] malloc: Deadlock between fflush, getdelim, and fork
3261 [19505] libc: Incorrect file descriptor validity checks in
3262 posix_spawn_file_actions_add{open,close,dup2}
3263 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3264 when using RTLD_NEXT
3265 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3266 `intl/{gettextP,loadinfo}.h'
3267 [19534] libc: execle, execlp may use malloc
3268 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3269 [19573] network: res_nclose and __res_maybe_init disagree about name
3270 server initialization, breaking Hesiod
3271 [19575] localedata: Status of GB18030 tables
3272 [19581] localedata: sr_* date_fmt string contains additional newline
3273 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3275 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3276 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3277 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3278 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3280 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3282 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3284 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3285 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3286 [19633] locale: strfmon_l applies global locale to number formatting
3287 [19642] network: Memory leak in getnameinfo
3288 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3289 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3291 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3292 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3294 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3295 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3297 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3299 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3301 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3302 pointers and lengths in error-case.
3303 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3304 report errors on UTF-16 surrogates values.
3305 [19755] nscd: nscd assertion failure in gc
3306 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3307 [19759] libc: mempcpy shouldn't be inlined
3308 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3309 [19765] libc: s390 needs an optimized mempcpy
3310 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3311 NAME_MAX limit assumption (CVE-2016-1234)
3312 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3313 [19787] network: Missing and incorrect truncation checks in getnameinfo
3314 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3316 [19791] network: Assertion failure in res_query.c with un-connectable name
3318 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3319 [19822] math: libm.so install clobbers old version
3320 [19825] network: resolv: send_vc can return uninitialized data in second
3321 response to getaddrinfo
3322 [19830] network: nss_dns: should check RDATA length against buffer length
3323 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3324 confronted with A/AAAA records of invalid size
3325 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3326 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3327 [19853] stdio: Printing IBM long double in decimal with high precision is
3329 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3330 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3331 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3333 [19865] network: Assertion failure or memory leak in
3334 _nss_dns_getcanonname_r
3335 [19868] network: nss_dns: netent code does not skip over non-PTR records
3336 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3338 [19881] string: Improve x86-64 memset
3339 [19907] string: Incorrect memcpy tests
3340 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3342 [19925] libc: termios.h XCASE namespace
3343 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3344 [19929] libc: limits.h NL_NMAX namespace
3345 [19931] stdio: Memory leak in vfprintf
3346 [19957] libc: clone(CLONE_VM) access invalid parent memory
3347 [19963] localedata: en_IL: New locale
3348 [19989] stdio: stdio.h cuserid namespace
3349 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3351 [19996] locale: langinfo.h nl_langinfo_l namespace
3352 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3353 [20010] network: getaddrinfo: Stack overflow in hostent translation
3355 [20012] stdio: libio: fmemopen append mode failure
3356 [20014] stdio: stdio.h namespace for pre-threads POSIX
3357 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3358 [20023] libc: fcntl.h timespec namespace
3359 [20024] math: [x86_64] vectorized sincos trashes the stack
3360 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3361 [20041] time: sys/time.h timespec namespace
3362 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3363 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3364 [20051] libc: ttyslot in wrong header under wrong conditions
3365 [20054] libc: gethostname not declared for XPG4
3366 [20055] libc: termios.h missing tcgetsid for XPG4
3367 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3369 [20073] libc: sys/stat.h fchmod namespace
3370 [20074] libc: stdlib.h rand_r namespace
3371 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3372 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3374 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3375 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3377 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3378 [20119] libc: Wrong mask for processors level type from CPUID
3379 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3380 AS not supporting AVX512
3381 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3383 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3384 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3386 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3387 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3388 [20178] libc: posix_spawn{p} should not call exit
3389 [20191] stdio: libio: vtables hardening
3390 [20195] string: FMA4 detection requires CPUID execution with register
3392 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3393 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3395 [20212] math: acos (sNaN) returns sNaN
3396 [20213] math: asin (sNaN) returns sNaN
3397 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3398 [20218] math: [i386] asinhl (sNaN) returns sNaN
3399 [20219] math: [i386] atanhl (sNaN) returns sNaN
3400 [20222] stdio: fopencookie: Mangle function pointers
3401 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3402 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3403 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3405 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3406 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3407 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3408 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3409 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3410 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3411 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3412 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3413 [20240] math: modf (sNaN) returns sNaN
3414 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3415 [20250] math: frexp (sNaN) returns sNaN
3416 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3417 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3419 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3420 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3421 subscript is below array bounds [-Werror=array-bounds]
3422 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3423 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3425 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3426 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3428 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3429 "invalid" exceptions
3430 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3431 [20316] localedata: id_ID: Februari instead of Pebruari
3432 [20327] string: POWER8 strcasecmp returns incorrect result
3433 [20347] math: Failure: Test: j0_downward (0xap+0)
3434 [20348] libc: FAIL: misc/tst-preadvwritev64
3435 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3436 [20350] libc: There is no test for p{read,write}64
3437 [20357] math: Incorrect cos result for 1.5174239687223976
3438 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3442 * Unicode 8.0.0 Support: Character encoding, character type info, and
3443 transliteration tables are all updated to Unicode 8.0.0, using new
3444 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3445 These updates cause user visible changes, such as the fixes for bugs
3446 89, 16061, and 18568.
3448 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3449 kernel-internal CPU set size. This means that requests that change the
3450 CPU affinity which failed before (for example, an all-ones CPU mask) will
3451 now succeed. Applications that need to determine the effective CPU
3452 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3453 setting it because the kernel can adjust it (and the previous size check
3454 would not detect this in the majority of cases).
3456 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3457 the following new symbols are used: fts64_children, fts64_close,
3458 fts64_open, fts64_read and fts64_set.
3460 * getaddrinfo now detects certain invalid responses on an internal netlink
3461 socket. If such responses are received, an affected process will
3462 terminate with an error message of "Unexpected error <number> on netlink
3463 descriptor <number>" or "Unexpected netlink response of size <number> on
3464 descriptor <number>". The most likely cause for these errors is a
3465 multi-threaded application which erroneously closes and reuses the netlink
3466 file descriptor while it is used by getaddrinfo.
3468 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3469 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3470 unnecessary serialization of memory allocation requests across threads.
3471 The defect is now corrected. Users should see a substantial increase in
3472 the concurent throughput of allocation requests for applications which
3473 trigger this bug. Affected applications typically create and
3474 destroy threads frequently. (Bug 19048 was reported and analyzed by
3477 * There is now a --disable-timezone-tools configure option for disabling the
3478 building and installing of the timezone related utilities (zic, zdump, and
3479 tzselect). This is useful for people who build the timezone data and code
3480 independent of the GNU C Library.
3482 * The obsolete header <regexp.h> has been removed. Programs that require
3483 this header must be updated to use <regex.h> instead.
3485 * The obsolete functions bdflush, create_module, get_kernel_syms,
3486 query_module and uselib are no longer available to newly linked binaries;
3487 the header <sys/kdaemon.h> has been removed. These functions and header
3488 were specific to systems using the Linux kernel and could not usefully be
3489 used with the GNU C Library on systems with version 2.6 or later of the
3492 * Optimized string, wcsmbs and memory functions for IBM z13.
3493 Implemented by Stefan Liebler.
3495 * Newly linked programs that define a variable called signgam will no longer
3496 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3497 require signgam to be set by those functions must ensure that they use the
3498 variable provided by the GNU C Library and declared in <math.h>, without
3499 defining their own copy.
3501 * The minimum GCC version that can be used to build this version of the GNU
3502 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3503 still be used to compile programs using the GNU C Library.
3505 Security related changes:
3507 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3508 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3510 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3511 the pointer guard feature. It is always enabled. Previously,
3512 LD_POINTER_GUARD could be used to disable security hardening in binaries
3513 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3516 * An integer overflow in hcreate and hcreate_r could lead to an
3517 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3519 * The catopen function no longer has unbounded stack usage. Reported by
3520 Max. (CVE-2015-8779)
3522 * The nan, nanf and nanl functions no longer have unbounded stack usage
3523 depending on the length of the string passed as an argument to the
3524 functions. Reported by Joseph Myers. (CVE-2014-9761)
3526 * A stack-based buffer overflow was found in libresolv when invoked from
3527 libnss_dns, allowing specially crafted DNS responses to seize control
3528 of execution flow in the DNS client. The buffer overflow occurs in
3529 the functions send_dg (send datagram) and send_vc (send TCP) for the
3530 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3531 family. The use of AF_UNSPEC triggers the low-level resolver code to
3532 send out two parallel queries for A and AAAA. A mismanagement of the
3533 buffers used for those queries could result in the response of a query
3534 writing beyond the alloca allocated buffer created by
3535 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3536 the overflow. Thanks to the Google Security Team and Red Hat for
3537 reporting the security impact of this issue, and Robert Holiday of
3538 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3540 The following bugs are resolved with this release:
3542 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3543 [887] math: Math library function "logb" and "nextafter" inconsistent
3544 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3545 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3546 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3547 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3549 [4404] localedata: German translation of "Alarm clock" is misleading
3550 [6799] math: nextafter() and nexttoward() doen't set errno on
3551 overflow/underflow errors
3552 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3554 [10432] nis: _nss_nis_setnetgrent assertion failure
3555 [11460] libc: fts has no LFS support
3556 [12926] network: getaddrinfo()/make_request() may spin forever
3557 [13065] nptl: Race condition in pthread barriers
3558 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3559 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3561 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3562 [14912] libc: Rename non-installed bits/*.h headers
3563 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3564 [15367] math: Let gcc use __builtin_isinf
3565 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3566 [15421] math: lgamma wrongly sets signgam for ISO C
3567 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3568 FE_INVALID with argument out of range
3569 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3571 [15786] dynamic-link: ifunc resolver functions can smash function
3573 [15918] math: Unnecessary check for equality in hypotf()
3574 [16061] localedata: Review / update transliteration data
3575 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3577 [16141] time: strptime %z offset restriction
3578 [16171] math: drem should be alias of remainder
3579 [16296] math: fegetround is pure?
3580 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3581 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3583 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3584 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3586 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3587 "Exception "Inexact" set" on ppc32
3588 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3589 [16517] math: Missing underflow exception from tanf/tan/tanl
3590 [16519] math: Missing underflow exception from sinhf
3591 [16520] math: Missing underflow exception from tanhf
3592 [16521] math: Missing underflow exception from exp2
3593 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3595 [16734] stdio: fopen calls mmap to allocate its buffer
3596 [16961] math: nan function incorrect handling of bad sequences
3597 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3598 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3599 [16985] locale: localedef: confusing error message when opening output
3601 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3602 [17197] locale: Redundant shift character in iconv conversion output at
3604 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3605 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3606 [17250] dynamic-link: static linking breaks nss loading
3607 (getaddrinfo/getpwnam/etc...)
3608 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3610 [17441] math: isnan() should use __builtin_isnan() in GCC
3611 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3612 (related to lock elision)
3613 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3614 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3615 [17887] time: strptime should be able to parse "+01:00" style timezones
3616 [17905] libc: catopen() Multiple unbounded stack allocations
3618 [18084] libc: backtrace (..., 0) dumps core on x86
3619 [18086] libc: nice() sets errno to 0 on success
3620 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3621 is too large (CVE-2015-8778)
3622 [18251] dynamic-link: SONAME missing when audit modules provides path
3623 [18265] libc: add attributes for wchar string and memory functions
3624 [18370] math: csqrt missing underflows
3625 [18421] libc: [hppa] read-only segment has dynamic relocations
3626 [18472] libc: Obsolete syscall wrappers should be compat symbols
3627 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3628 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3629 [18525] localedata: Remove locale timezone information
3630 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3631 [18568] localedata: Update locale data to Unicode 8.0
3632 [18589] locale: sort-test.sh fails at random
3633 [18595] math: ctan, ctanh missing underflows
3634 [18604] libc: assert macro-expands its argument
3635 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3636 contains a vector instruction exception.
3637 [18611] math: j1, jn missing errno setting on underflow
3638 [18618] localedata: sync Chechen locale definitions with other *_RU
3640 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3641 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3642 [18665] network: In send_dg, the recvfrom function is NOT always using the
3643 buffer size of a newly created buffer (CVE-2015-7547)
3644 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3646 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3648 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3649 [18699] math: tilegx cproj() for various complex infinities does not yield
3651 [18724] libc: Harden put*ent functions against data injection
3652 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3653 [18755] build: build errors with -DNDEBUG
3654 [18757] stdio: fmemopen fails to set errno on failure
3655 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3657 [18781] libc: openat64 lacks O_LARGEFILE
3658 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3659 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3660 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3661 [18790] math: [ldbl-128ibm] tanhl inaccurate
3662 [18795] libc: stpncpy fortification misses buffer lengths that are
3663 statically too large
3664 [18796] build: build fails for --disable-mathvec
3665 [18803] math: hypot missing underflows
3666 [18820] stdio: fmemopen may leak memory on failure
3667 [18823] math: csqrt spurious underflows
3668 [18824] math: fma spurious underflows
3669 [18825] math: pow missing underflows
3670 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3671 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3672 [18870] build: sem_open.c fails to compile with missing symbol
3674 [18872] stdio: Fix memory leak in printf_positional
3675 [18873] libc: posix_fallocate overflow check ineffective
3676 [18875] math: Excess precision leads incorrect libm
3677 [18877] libc: arm: mmap offset regression
3678 [18887] libc: memory corruption when using getmntent on blank lines
3679 [18918] localedata: hu_HU: change time to HH:MM:SS format
3680 [18921] libc: Regression: extraneous stat() and fstat() performed by
3682 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3683 binaries (CVE-2015-8777)
3684 [18951] math: tgamma missing underflows
3685 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3687 [18953] localedata: lt_LT: change currency symbol to the euro
3688 [18956] math: powf inaccuracy
3689 [18961] math: [i386] exp missing underflows
3690 [18966] math: [i386] exp10 missing underflows
3691 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3692 [18969] build: multiple string test failures due to missing locale
3694 [18970] libc: Reference of pthread_setcancelstate in libc.a
3695 [18977] math: float / long double Bessel functions not in XSI POSIX
3696 [18980] math: i386 libm functions return with excess range and precision
3697 [18981] math: i386 scalb*, ldexp return with excess range and precision
3698 [18982] stdio: va_list and vprintf
3699 [18985] time: Passing out of range data to strftime() causes a segfault
3701 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3702 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3703 [19012] locale: iconv_open leaks memory on error path
3704 [19016] math: clog, clog10 inaccuracy
3705 [19018] nptl: Mangle function pointers in tls_dtor_list
3706 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3707 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3708 [19048] malloc: malloc: arena free list can become cyclic, increasing
3710 [19049] math: [powerpc] erfc incorrect zero sign
3711 [19050] math: [powerpc] log* incorrect zero sign
3712 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3713 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3714 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3715 [19074] network: Data race in _res_hconf_reorder_addrs
3716 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3717 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3718 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3720 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3722 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3723 [19086] manual: posix_fallocate64 documented argument order is wrong.
3724 [19088] math: lround, llround missing exceptions close to overflow
3726 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3727 [19095] math: dbl-64 lrint incorrect for 64-bit long
3728 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3729 [19124] dynamic-link: ld.so failed to build with older assmebler
3730 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3731 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3732 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3733 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3734 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3735 pthread_setaffinity_np
3736 [19156] math: [ldbl-128] j0l spurious underflows
3737 [19164] nptl: tst-getcpu fails with many possible CPUs
3738 [19168] math: math/test-ildoubl and math/test-ldouble failure
3739 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3740 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3742 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3743 (FE_NOMASK_ENV) do not clear SSE exceptions
3744 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3745 _int_new_arena/reused_arena
3746 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3747 [19201] math: dbl-64 remainder incorrect sign of zero result
3748 [19205] math: bits/math-finite.h conditions do not match math.h and
3750 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3751 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3752 for C99-based standards
3753 [19212] libc: features.h not -Wundef clean
3754 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3756 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3757 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3758 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3760 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3761 "inexact" exceptions
3762 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3764 [19242] libc: strtol incorrect in Turkish locales
3765 [19243] malloc: reused_arena can pick an arena on the free list, leading
3766 to an assertion failure and reference count corruption
3767 [19253] time: tzset() ineffective when temporary TZ did not include DST
3769 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3770 [19270] math: [hppa] Shared libm missing __isnanl
3771 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3772 MAP_HUGETLB and MAP_STACK defines
3773 [19313] nptl: Wrong __cpu_mask for x32
3774 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3775 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3776 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3777 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3778 [19363] time: x32: times() return value wrongly truncates/sign extends
3780 [19367] dynamic-link: Improve branch prediction on Silvermont
3781 [19369] network: Default domain name not reset by res_ninit when "search"
3782 / "domain" entry is removed from resolv.conf
3783 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3785 [19385] localedata: bg_BG: time separator should be colon, not comma
3786 [19408] libc: linux personality syscall wrapper may erroneously return an
3787 error on 32-bit architectures
3788 [19415] libc: dladdr returns wrong names on hppa
3789 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3790 IBM905, IBM907, and IBM909
3791 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3792 [19443] build: build failures with -DDEBUG
3793 [19451] build: Make check fails on test-double-vlen2
3794 [19462] libc: Glibc failed to build with -Os
3795 [19465] math: Wrong code with -Os
3796 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3798 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3800 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3801 [19486] math: S390: Math tests fail with "Exception Inexact set".
3802 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3803 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3805 [19590] math: Fail to build shared objects that use libmvec.so functions.
3809 * The following bugs are resolved with this release:
3811 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3812 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3813 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3814 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3815 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3816 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3817 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3818 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3819 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3820 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3821 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3822 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3823 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3824 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3825 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3826 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3827 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3828 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3829 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3830 18657, 18676, 18694, 18696, 18887.
3832 * Cache information can be queried via sysconf() function on s390 e.g. with
3833 _SC_LEVEL1_ICACHE_SIZE as argument.
3835 * A buffer overflow in gethostbyname_r and related functions performing DNS
3836 requests has been fixed. If the NSS functions were called with a
3837 misaligned buffer, the buffer length change due to pointer alignment was
3838 not taken into account. This could result in application crashes or,
3839 potentially arbitrary code execution, using crafted, but syntactically
3840 valid DNS responses. (CVE-2015-1781)
3842 * The time zone file parser has been made more robust against crafted time
3843 zone files, avoiding heap buffer overflows related to the processing of
3844 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3845 large time zone data files. Overly long time zone specifiers in the TZ
3846 variable no longer result in stack overflows and crashes.
3848 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3849 for LD and GD on x86 and x86-64, has been implemented. You will need
3850 binutils-2.24 or later to enable this optimization.
3852 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3853 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3854 Hat). These updates cause user visible changes, such as the fix for bug
3857 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3858 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3859 condition in some applications.
3861 * Added vector math library named libmvec with the following vectorized x86_64
3862 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3864 The library can be disabled with --disable-mathvec. Use of the functions is
3865 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3866 Shared library libmvec.so is linked in as needed when using -lm (no need to
3867 specify -lmvec explicitly for not static builds).
3868 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3870 * A new fmemopen implementation has been added with the goal of POSIX
3871 compliance. The new implementation fixes the following long-standing
3872 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3873 old implementation is still present for use be by existing binaries.
3875 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3876 releases. It has been fixed to match 2.19 and older, but binaries built
3877 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3879 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3880 Contributed by Roland McGrath (Google).
3882 * The header <regexp.h> is deprecated, and will be removed in a future
3883 release. Use of this header will trigger a deprecation warning.
3884 Application developers should update their code to use <regex.h> instead.
3886 This header was formerly part of SUS, but was deprecated in 1994 and
3887 removed from the standard in 2001. Also, the glibc implementation
3888 leaks memory. See BZ#18681 for more details.
3892 * The following bugs are resolved with this release:
3894 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3895 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3896 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3897 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3898 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3899 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3900 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3901 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3902 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3903 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3906 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3907 too little memory for the to-be-scanned arguments and overflow the
3908 allocated buffer. The implementation now correctly computes the required
3909 buffer size when using malloc, and switches to malloc from alloca as
3912 * A new semaphore algorithm has been implemented in generic C code for all
3913 machines. Previous custom assembly implementations of semaphore were
3914 difficult to reason about or ensure that they were safe. The new version
3915 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3916 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3917 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3919 * Port to Altera Nios II has been contributed by Mentor Graphics.
3921 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3922 implementations for powerpc64/powerpc64le.
3923 Implemented by Adhemerval Zanella (IBM).
3925 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3926 and powerpc64le. This may improve lock scaling of existing programs on
3927 HTM capable systems. The lock elision code is only enabled with
3928 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3929 powerpc will issue a transaction abort on every syscall to avoid side
3930 effects being visible outside transactions.
3932 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3933 AArch64. Contributed by ARM Ltd.
3935 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3937 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3938 under certain input conditions resulting in the execution of a shell for
3939 command substitution when the application did not request it. The
3940 implementation now checks WRDE_NOCMD immediately before executing the
3941 shell and returns the error WRDE_CMDSUB as expected.
3943 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3944 processing format strings with a large number of format specifiers.
3946 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3947 infinite loop if the DNS response contained a PTR record of an unexpected
3950 * The minimum GCC version that can be used to build this version of the GNU
3951 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3952 still be used to compile programs using the GNU C Library.
3954 * The GNU C Library is now built with -Werror by default. This can be
3955 disabled by configuring with --disable-werror.
3957 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3959 * The obsolete sigvec function has been removed. This was the original
3960 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3961 programs have been using instead for about 25 years. Of course, ABI
3962 compatibility for old binaries using sigvec remains intact.
3964 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3965 with newer versions of bison.
3967 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3968 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3969 registers overlay two consecutive single-precision registers. MIPS32R2
3970 introduced a new FPU mode (FR=1) where double-precision registers extend the
3971 corresponding single-precision registers which is incompatible with the
3972 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3973 require the use of FR=1 making a transition necessary. New o32 ABI
3974 extensions enable users to migrate over time from the original o32 ABI
3975 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3976 tracks the ABI of any loaded object and verifies that new objects are
3977 compatible. Mode transitions will also be requested as required and
3978 unsupportable objects will be rejected. The ABI checks include both soft and
3979 hard float ABIs for o32, n32 and n64.
3981 GCC 5 with GNU binutils 2.25 onwards:
3982 It is strongly recommended that all o32 system libraries are built using the
3983 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3984 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3985 compiler using --with-fp-32=xx to set this by default.
3989 * The following bugs are resolved with this release:
3991 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3992 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3993 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3994 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3995 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3996 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3997 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3998 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3999 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4000 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4001 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4002 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4003 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4004 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4005 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4007 * Reverted change of ABI data structures for s390 and s390x:
4008 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4009 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4010 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4011 are preserved pointing straight to the same implementation as the old ones.
4012 Given that, new callers will simply provide a too-big buffer to these
4013 functions. Any applications/libraries out there that embed jmp_buf or
4014 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4015 against 2.19 headers will have to rebuilt again. This is necessary in any
4016 case to revert the breakage in their ABI caused by the glibc change.
4018 * Support for file description locks is added to systems running the
4019 Linux kernel. The standard file locking interfaces are extended to
4020 operate on file descriptions, not file descriptors, via the use of
4021 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4022 are associated with an open file instead of a process.
4024 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4026 * The minimum Linux kernel version that this version of the GNU C Library
4027 can be used with is 2.6.32.
4029 * Running the testsuite no longer terminates as soon as a test fails.
4030 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4031 with PASS or FAIL lines for individual tests. A summary of the results is
4032 printed, including a list of failing lists, and "make check" exits with
4033 error status if there were any unexpected failures. "make check
4034 stop-on-test-failure=y" may be used to keep the old behavior.
4036 * The am33 port, which had not worked for several years, has been removed
4039 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4040 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4041 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4042 conflicted with POSIX (support for which was removed in 2.19), the
4043 interfaces those macros enabled remain available when compiling with
4044 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4045 test macros defined.
4047 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4049 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4050 This may improve lock scaling of existing programs on TX capable systems.
4051 The lock elision code is only built with --enable-lock-elision=yes and
4052 then requires a GCC version supporting the TX builtins. With lock elision
4053 default mutexes are elided via __builtin_tbegin, if the cpu supports
4054 transactions. By default lock elision is not enabled and the elision code
4057 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4058 copy the path argument. This allowed programs to cause posix_spawn to
4059 deference a dangling pointer, or use an unexpected pathname argument if
4060 the string was modified after the posix_spawn_file_actions_addopen
4063 * All supported architectures now use the main glibc sysdeps directory
4064 instead of some being in a separate "ports" directory (which was
4065 distributed separately before glibc 2.17).
4067 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4068 On configurations that support it (all Linux configurations), it's now
4069 used regardless of the --enable-add-ons switch to configure. It is no
4070 longer possible to build such configurations without pthreads support.
4072 * Locale names, including those obtained from environment variables (LANG
4073 and the LC_* variables), are more tightly checked for proper syntax.
4074 setlocale will now fail (with EINVAL) for locale names that are overly
4075 long, contain slashes without starting with a slash, or contain ".." path
4076 components. (CVE-2014-0475) Previously, some valid locale names were
4077 silently replaced with the "C" locale when running in AT_SECURE mode
4078 (e.g., in a SUID program). This is no longer necessary because of the
4081 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4082 with application code using Intel MPX instructions. (With all previous
4083 versions, the MPX register state could be clobbered when making calls
4084 into or out of a shared library.) Note that while the new dynamic
4085 linker is compatible with all known x86 hardware whether or not it
4086 supports Intel MPX, some x86 instruction-set emulators might fail to
4087 handle the new instruction encodings. This is known to affect Valgrind
4088 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4089 release), and might affect other tools that do instruction emulation.
4091 * Support for loadable gconv transliteration modules has been removed.
4092 The support for transliteration modules has been non-functional for
4093 over a decade, and the removal is prompted by security defects. The
4094 normal gconv conversion modules are still supported. Transliteration
4095 with //TRANSLIT is still possible, and the //IGNORE specifier
4096 continues to be supported. (CVE-2014-5119)
4098 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4099 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4100 resulting a denial-of-service security vulnerability in applications which
4101 use functions related to iconv. (CVE-2014-6040)
4105 * The following bugs are resolved with this release:
4107 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4108 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4109 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4110 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4111 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4112 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4113 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4114 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4115 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4116 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4117 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4118 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4119 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4120 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4121 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4122 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4123 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4124 16431, 16453, 16474, 16506, 16510, 16529
4126 * Slovenian translations for glibc messages have been contributed by the
4127 Translation Project's Slovenian team of translators.
4129 * The public headers no longer use __unused nor __block. This change is to
4130 support compiling programs that are derived from BSD sources and use
4131 __unused internally, and to support compiling with Clang's -fblock
4132 extension which uses __block.
4134 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4135 large collation sequences to optimize multiple passes. This cache
4136 computation may overflow for large collation sequences and may cause a
4137 stack or buffer overflow. This is now fixed to use a slower algorithm
4138 which does not use a cache if there is an integer overflow.
4140 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4141 rules for large collation sequences to optimize multiple passes and falls
4142 back to alloca if malloc fails, resulting in a possible stack overflow.
4143 The implementation now falls back to an uncached collation sequence lookup
4146 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4147 initialized for static applications resulting in the security feature
4148 being disabled. The pointer guard is now correctly initialized to a
4149 random value for static applications. Existing static applications need
4150 to be recompiled to take advantage of the fix (bug 15754).
4152 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4153 to the d_name member of struct dirent, or omit the terminating NUL
4154 character. (Bugzilla #14699).
4156 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4157 aligned_alloc functions could allocate too few bytes or corrupt the
4158 heap when passed very large allocation size values (Bugzilla #15855,
4161 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4162 for AF_INET6 has been fixed (Bugzilla #16072).
4164 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4165 pap_CW, quz_PE, the_NP.
4167 * Substantially revised locales: gd_GB, ht_HT
4169 * The LC_ADDRESS field was updated to support country_car for almost all
4172 * ISO 1427 definitions were updated.
4174 * ISO 3166 definitions were updated.
4176 * The localedef utility now supports --big-endian and --little-endian
4177 command-line options to generate locales for a different system from that
4178 for which the C library was built.
4180 * Binary locale files now only depend on the endianness of the system for
4181 which they are generated and not on other properties of that system. As a
4182 consequence, binary files generated with new localedef may be incompatible
4183 with old versions of the GNU C Library, and binary files generated with
4184 old localedef may be incompatible with this version of the GNU C Library,
4185 in the following circumstances:
4187 + Locale files may be incompatible on m68k systems.
4189 + Locale archive files (but not separate files for individual locales) may
4190 be incompatible on systems where plain "char" is signed.
4192 * The configure option --disable-versioning has been removed. Builds with
4193 --disable-versioning had not worked for several years.
4195 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4196 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4198 * SystemTap probes for malloc have been introduced.
4200 * SystemTap probes for slow multiple precision fallback paths of
4201 transcendental functions have been introduced.
4203 * Support for powerpc64le has been added.
4205 * The soft-float powerpc port now supports e500 processors.
4207 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4209 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4210 set of header declarations that are enabled by default, even when other
4211 feature test macros or compiler options such as -std=c99 would otherwise
4212 disable some of those declarations.
4214 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4215 conflict with POSIX. The libbsd-compat library (which was a dummy library
4216 that did nothing) has also been removed.
4218 * Preliminary documentation about Multi-Thread, Async-Signal and
4219 Async-Cancel Safety has been added.
4221 * Change of ABI data structures for s390 and s390x:
4222 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4223 allow for future hardware extensions. All library functions that accept or
4224 return these structures were versioned in order to provide backwards
4225 compatibility with existing code. However, not all cases can be handled
4226 with interface versioning. If an application embeds either structure into
4227 another structure and that structure is passed to another compilation unit
4228 which expects the newer larger-sized object then any access to the new
4229 fields will result in undefined behaviour. Similarly any access to fields
4230 that were moved by the enlarging of the structures will cause undefined
4231 behaviour. To fix the undefined behaviour all objects that are part of the
4232 final in-memory image must agree on the size of structures, and this may
4233 require recompilation.
4237 * The following bugs are resolved with this release:
4239 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4240 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4241 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4242 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4243 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4244 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4245 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4246 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4247 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4248 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4249 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4250 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4251 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4254 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4255 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4256 Distributions can re-enable building and using pt_chown via the new configure
4257 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4258 considerable security risks and should only be used if the distribution
4259 understands and accepts the risks.
4261 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4264 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4265 fixed (Bugzilla #15330).
4267 * Add support for calling C++11 thread_local object destructors on thread
4268 and program exit. This needs compiler support for offloading C++11
4269 destructor calls to glibc.
4271 * Improved worst case performance of libm functions with double inputs and
4274 * Support for priority inherited mutexes in pthread condition variables on
4275 non-x86 architectures.
4277 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4279 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4281 * Optimized string functions for ARM. Implemented by Will Newton and
4284 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4286 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4289 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4290 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4292 * Added a benchmark framework to track performance of functions in glibc.
4294 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4295 It is based on draft TS 18661 and currently enabled as a GNU extension.
4297 * On Linux, the clock function now uses the clock_gettime system call
4298 for improved precision, rather than old times system call.
4300 * Added support for version-3 tz format files. This is needed when using
4301 the tz database release 2013e or later, and affects a few unusual cases --
4302 currently only TZ='America/Godthab' for time stamps after 2037.
4304 * Added new API functions pthread_getattr_default_np and
4305 pthread_setattr_default_np to get and set the default pthread
4306 attributes of a process.
4308 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4309 This may improve lock scaling of existing programs on TSX capable systems.
4310 When the --enable-lock-elision=yes parameter is specified at configure
4311 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4314 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4315 availability). Implemented by Ryan S. Arnold.
4317 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4321 * The following bugs are resolved with this release:
4323 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4324 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4325 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4326 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4327 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4328 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4329 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4330 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4331 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4332 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4333 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4334 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4335 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4336 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4337 14879, 14889, 14893, 14898, 14914.
4339 * Optimization of memcpy for MIPS.
4341 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4342 EMFILE has been fixed (Bugzilla #14889).
4344 * The add-on ports collection is now distributed in the "ports" subdirectory
4345 of the main GNU C Library distribution, rather than separately.
4347 * Port to ARM AArch64 contributed by Linaro.
4349 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4350 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4352 Implemented by Andreas Krebbel.
4354 * The new function secure_getenv allows secure access to the environment,
4355 returning NULL if running in a SUID/SGID process. This function replaces
4356 the internal function __secure_getenv.
4358 * SystemTap static probes have been added into the dynamic linker.
4359 Implemented by Gary Benson.
4361 * Optimizations of string functions strstr, strcasestr and memmem.
4362 Implemented by Maxim Kuvyrkov.
4364 * The minimum Linux kernel version that this version of the GNU C Library
4365 can be used with is 2.6.16.
4367 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4368 powerpc POWER7. Implemented by Will Schmidt.
4370 * New configure option --disable-nscd builds the C library such that it
4371 never attempts to contact the Name Service Caching Daemon (nscd).
4372 New configure option --disable-build-nscd avoids building nscd itself;
4373 this is the default if --disable-nscd is used.
4375 * Improved support for cross-compilation, including cross-testing and
4376 bootstrap builds without a previously built glibc.
4378 * Several testsuite tests are now able to test multiple IFUNC variants of an
4379 interface, rather than just testing the one that would be chooen by
4382 * New configure options --with-bugurl and --with-pkgversion, for
4383 distributors to use to embed their bug-reporting and package version
4384 information in --help and --version output.
4386 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4387 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4388 allows creation of chroots without the procfs mounted on /proc.
4390 * The `crypt' function now fails if passed salt bytes that violate the
4391 specification for those values. On Linux, the `crypt' function will
4392 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4393 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4394 when the mode is enabled.
4396 * The `clock_*' suite of functions (declared in <time.h>) is now available
4397 directly in the main C library. Previously it was necessary to link with
4398 -lrt to use these functions. This change has the effect that a
4399 single-threaded program that uses a function such as `clock_gettime' (and
4400 is not linked with -lrt) will no longer implicitly load the pthreads
4401 library at runtime and so will not suffer the overheads associated with
4402 multi-thread support in other code such as the C++ runtime library.
4404 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4409 * The following bugs are resolved with this release:
4411 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4412 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4413 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4414 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4415 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4416 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4417 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4418 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4419 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4420 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4421 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4422 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4423 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4424 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4425 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4426 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4427 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4428 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4429 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4430 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4431 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4432 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4435 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4436 configuring glibc with:
4437 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4438 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4439 Implemented by H.J. Lu.
4443 + define static_assert
4445 + do not declare gets
4447 + declare at_quick_exit and quick_exit also for ISO C11
4449 + aligned_alloc. NB: The code is deliberately allows the size parameter
4450 to not be a multiple of the alignment. This is a moronic requirement
4451 in the standard but it is only a requirement on the caller, not the
4454 + timespec_get added
4456 + uchar.h support added
4458 + CMPLX, CMPLXF, CMPLXL added
4460 Implemented by Ulrich Drepper.
4462 * Support for the IA-64 has been moved to ports.
4464 * Remove support for anything but ELF binary format
4466 * Checking versions of poll, ppoll added.
4467 Implemented by Ulrich Drepper.
4469 * More generic and 64-bit performance optimizations to math functions.
4470 Implemented by Ulrich Drepper.
4472 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4473 headers and functions available at compile time as they were before
4474 version 2.14. This option will be removed at some time in the future
4475 after the TI-RPC library becomes fully sufficient for the needs of
4476 existing applications.
4478 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4479 Note that glibc is not expected to work with any Linux kernel version
4482 * New header <sys/auxv.h> and function getauxval allowing easy access to
4483 the AT_* key-value pairs passed from the Linux kernel. The header also
4484 defines the HWCAP_* bits associated with the AT_HWCAP key.
4486 * New locales: mag_IN
4488 * New configure option --enable-systemtap builds SystemTap static probes
4489 into libc for setjmp and longjmp and into libpthread for various operations.
4490 So far the setjmp/longjmp probes and some of the libpthread probes are
4491 provided only for i*86 and x86_64.
4492 Implemented by Roland McGrath and Rayson Ho.
4494 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4496 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4499 * More optimized functions for SPARC. Implemented by David S. Miller.
4501 * Improved support for cross-compilation, especially bootstrap builds
4502 without a previously built glibc.
4504 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4505 Chris Metcalf from Tilera.
4507 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4508 now supported for ARM processors.
4510 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4511 as the name of the dynamic linker, to distinguish it from the
4512 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4514 * Support for CRIS has been removed from ports.
4516 * A new class of installed header has been documented for low-level
4517 platform-specific functionality. PowerPC added the first instance with a
4518 function to provide time base register access. Contributed by Tulio
4519 Magno Quites Machado Filho.
4521 * ix86 configurations now install header files that are consistent with
4522 what x86-64 configurations install. These same header files can be used
4523 for -m32, -m64, or -mx32 builds.
4524 Contributed by H.J. Lu.
4526 * Math library bug fixes. A thorough audit of all open math library bugs was
4527 conducted by Joseph Myers. Significant progress was made on many math
4528 library bugs resulting in more accurate exceptions and function results.
4529 Many thanks to all those that contributed including Andreas Jaeger for his
4530 patch review and work on the x87 trigonometric instruction issues.
4532 * Timezone data is no longer installed. Timezone-related binaries and scripts
4533 will continue to be installed. Users should obtain their timezone data from
4534 their distribution provider or from the tzdata package at
4535 <ftp://munnari.oz.au/pub/>.
4539 * The following bugs are resolved with this release:
4541 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4542 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4543 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4544 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4545 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4546 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4547 13484, 13506, 13515, 13523, 13524, 13538, 13540
4549 * New program pldd to list loaded object of a process
4550 Implemented by Ulrich Drepper.
4552 * Add nss_db support back to glibc. No more dependency on Berkeley db
4553 and support for initgroups lookups.
4554 Implemented by Ulrich Drepper.
4556 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4557 Contributed by HJ Lu.
4559 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4560 Contributed by HJ Lu.
4562 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4563 on x86-32 and x86-64.
4564 Contributed by Liubov Dmitrieva.
4566 * Optimized strchr and strrchr for SSE on x86-32.
4567 Contributed by Liubov Dmitrieva.
4569 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4570 for x86-64 and x86-32.
4571 Contributed by Liubov Dmitrieva.
4573 * New interfaces: scandirat, scandirat64
4574 Implemented by Ulrich Drepper.
4576 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4577 Implemented by Ulrich Drepper.
4579 * nscd now also caches the netgroup database.
4580 Implemented by Ulrich Drepper.
4582 * Integrate libm with gcc's -ffinite-math-only option.
4583 Implemented by Ulrich Drepper.
4585 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4586 to math functions. Implemented by Ulrich Drepper.
4588 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4589 Implemented by Ulrich Drepper.
4591 * New Linux interfaces: process_vm_readv, process_vm_writev
4593 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4594 Implemented by Ulrich Drepper.
4596 * Optimized nearbyint and strcasecmp for PPC.
4597 Implemented by Adhemerval Zanella.
4599 * New locales: bho_IN, unm_US, es_CU, ta_LK
4603 * The following bugs are resolved with this release:
4605 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4606 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4607 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4608 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4609 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4610 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4611 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4612 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4613 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4614 12795, 12811, 12813, 12814, 12841
4616 * The RPC implementation in libc is obsoleted. Old programs keep working
4617 but new programs cannot be linked with the routines in libc anymore.
4618 Programs in need of RPC functionality must be linked against TI-RPC.
4619 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4621 Visible changes of this change include (obviously) the inability to link
4622 programs using RPC functions without referencing the TI-RPC library and the
4623 removal of the RPC headers from the glibc headers.
4624 Implemented by Ulrich Drepper.
4626 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4627 syncfs, setns, sendmmsg
4629 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4630 yue_HK, lij_IT, mhr_RU
4632 * New encodings: CP770, CP771, CP772, CP773, CP774
4634 * New program sotruss to trace calls through PLTs
4635 Implemented by Ulrich Drepper.
4637 * The malloc hook implementation is marked deprecated and will be removed
4638 from the default implementation in the next version. The design never
4639 worked ever since the introduction of threads. Even programs which do
4640 not create threads themselves can use multiple threads created internally.
4644 * The following bugs are resolved with this release:
4646 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4647 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4648 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4649 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4652 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4654 * POWER7 optimizations: memset, memcmp, strncmp
4656 * New optimized string functions for x86-64: strnlen (SSE2),
4657 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4658 Implemented by Ulrich Drepper.
4662 * The following bugs are resolved with this release:
4664 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4665 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4666 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4667 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4668 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4669 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4670 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4671 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4673 * New interfaces: pthread_getname_np, pthread_setname_np
4675 * New Linux interface: recvmmsg
4677 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4679 * The dynamic linker now recognizes supported ABI versions from the
4680 EI_ABIVERSION field in the ELF header.
4681 Implemented by Ulrich Drepper.
4683 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4684 will not be used to fill in password fields in the passwd.byname replies.
4685 Instead it is used to synthesize the shadow.byname table, should it be
4686 missing. This is a useful mode in some installations involving Solaris.
4687 Implemented by Ulrich Drepper.
4689 * New locales: kok_IN, sq_MK, cv_RU
4693 * The following bugs are resolved with this release:
4695 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4696 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4697 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4698 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4699 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4700 10789, 10817, 10823, 10840, 10847
4702 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4704 Implemented by Ulrich Drepper.
4706 * Checking version of longjmp added that fails if an uninitialized stack
4707 frame would be created. Implemented by Ulrich Drepper.
4709 * STT_GNU_IFUNC is now supported in static executables.
4710 Implemented by H.J. Lu.
4712 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4714 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4715 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4716 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4717 Contributed by H.J. Lu.
4719 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4720 Implemented by Ulrich Drepper.
4722 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4724 Contributed by H.J. Lu.
4726 * Support for fma instruction in AVX on x86-64.
4727 Implemented by H.J. Lu and Ulrich Drepper.
4729 * AVX support in x86-64 auditing support in ld.so.
4730 Implemented by H.J. Lu.
4732 * STB_GNU_UNIQUE support added.
4733 Implemented by Ulrich Drepper.
4735 * Implement second fallback mode for optimized DNS lookup for even more
4736 broken environments. If two requests from the same port are not
4737 handled correctly close the socket and open a new one before sending
4738 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4739 can be used to select this mode right away, instead of rediscovering the
4740 necessity is every process again.
4741 Implemented by Ulrich Drepper.
4743 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4744 Implemented by Adam Tkac.
4746 * Optimized iconv conversions for S390x.
4747 Implemented by Andreas Krebbel.
4749 * Using condvars with PI mutexes is now more efficient due to kernel
4750 support for requeueing to PI futexes. NPTL support added for x86-64.
4751 Implemented by Ulrich Drepper.
4753 * New locales: ps_AF, my_MM
4757 * The following bugs are resolved with this release:
4759 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4760 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4761 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4762 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4763 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4765 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4766 Implemented by Ulrich Drepper.
4768 * New Linux interfaces: accept4, fallocate, fallocate64.
4769 Implemented by Ulrich Drepper.
4771 * Correct declarations of string function when used in C++ code. This
4772 could lead to compile errors for invalid C++ code.
4774 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4777 * New POSIX 2008 interface: psiginfo
4778 Implemented by Ulrich Drepper.
4780 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4781 Implemented by Ulrich Drepper.
4783 * Support for selecting between multiple function definitions at runtime
4784 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4786 * The libcrypt library can now use the hash function implementations in
4787 NSS. Implemented by Ulrich Drepper.
4789 * The malloc implementation can be compiled to be less memory efficient
4790 but higher performing in multi-threaded programs.
4791 Implemented by Ulrich Drepper.
4793 * New locales: nan_TW@latin, ks_IN
4795 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4796 Implemented by Ulrich Drepper.
4798 * Extended printf hook support. It is possible to use user-defined types
4799 and extend existing format specifiers.
4800 Implemented by Ulrich Drepper.
4802 * Handling for group shadow files has been added.
4803 Implemented by Ulrich Drepper.
4805 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4806 servers (the case, e.g., for some people using the built-in DNS
4807 server in ADSL modems/routers). There is a once-per-process timeout
4808 in case of a broken server. To avoid it, users can run nscd or put
4809 'options single-request' in /etc/resolv.conf.
4810 Implemented by Ulrich Drepper.
4814 * The following bugs are resolved with this release:
4816 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
4817 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
4818 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
4819 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
4820 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
4822 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4823 up at the same time. Implemented by Ulrich Drepper.
4825 * TLS descriptors for LD and GD on x86 and x86-64.
4826 Implemented by Alexandre Oliva.
4828 * getaddrinfo now handles DCCP and UDPlite.
4829 Implemented by Ulrich Drepper.
4831 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4832 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4833 Implemented by Ulrich Drepper.
4835 * New implementation of memmem, strstr, and strcasestr which is O(n).
4836 Implemented by Eric Blake.
4838 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4840 * Implement "e" option for popen to open file descriptor with the
4841 close-on-exec flag set. Implemented by Ulrich Drepper.
4843 * Implement "b" mode for fmemopen. In this mode writes writes don't
4844 implicitly add a NUL byte and seeks from the end of the buffer really
4845 use the buffer end, not the string length as the basis.
4846 Implemented by Ulrich Drepper.
4848 * Many functions, exported and internal, now atomically set the close-on-exec
4849 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4851 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4853 Implemented by Pravin Satpute.
4855 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4859 * The following bugs are resolved with this release:
4861 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4862 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4863 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4864 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4865 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4866 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4867 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4869 * New locales: bo_CN, bo_IN, shs_CA.
4871 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4873 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4874 Implemented by Pravin Satpute.
4876 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4878 * nscd caches now all timeouts for DNS entries
4879 Implemented by Ulrich Drepper.
4881 * nscd is more efficient and wakes up less often.
4882 Implemented by Ulrich Drepper.
4884 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4885 vdprintf, and obstack_vprintf.
4886 Implemented by Jakub Jelinek.
4888 * Faster memset for x86-64.
4889 Implemented by Harsha Jagasia and H.J. Lu.
4891 * Faster memcpy on x86.
4892 Implemented by Ulrich Drepper.
4894 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4895 Implemented by Ulrich Drepper.
4897 * Faster sqrt and sqrtf implemention for some PPC variants.
4898 Implemented by Steven Munroe.
4902 * The following bugs are resolved with this release:
4904 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4905 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4906 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4907 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4908 5071, 5103, 5104, 5112, 5113, 5184, 5186
4910 * More checking functions: fread, fread_unlocked, open*, mq_open.
4911 Implemented by Jakub Jelinek and Ulrich Drepper.
4913 * Extend fortification to C++. Implemented by Jakub Jelinek.
4915 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4916 by not recognizing 'a' as a modifier when those specs are requested.
4917 Implemented by Jakub Jelinek.
4919 * PPC optimizations to math and string functions.
4920 Implemented by Steven Munroe.
4922 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4923 options to be passed. Implemented by Ulrich Drepper.
4925 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4927 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4928 Implemented by Ulrich Drepper.
4930 * Handle private futexes in the NPTL implementation.
4931 Implemented by Jakub Jelinek and Ulrich Drepper.
4933 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4934 Implemented by Roland McGrath and Ulrich Drepper.
4936 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4938 * SHA-256 and SHA-512 based password encryption.
4939 Implemented by Ulrich Drepper.
4941 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4942 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4945 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4946 Implemented by Ulrich Drepper.
4950 * The following bugs are resolved with this release:
4952 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4953 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4954 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4955 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4956 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4957 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4958 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4961 * New Linux interfaces: epoll_pwait, sched_getcpu.
4963 * New generic interfaces: strerror_l.
4965 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4969 * The following bugs are resolved with this release:
4971 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4972 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4973 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4974 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4975 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4976 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4977 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4978 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4979 3225, 3251, 3252, 3253, 3273
4981 * For Linux, the sorting of addresses returned by getaddrinfo now also
4982 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4983 Implemented by Ulrich Drepper.
4985 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4986 Implemented by Ulrich Drepper.
4988 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4990 * New iconv module for MIK. Contributed by Alexander Shopov.
4992 * For sites with broken group and/or passwd database, the auto-propagate
4993 option of nscd can prevent creating ID lookup entries from the results
4994 of a name lookup and vice versa. This usually is no problem but some
4995 site might have problems with the default behavior.
4996 Implemented by Ulrich Drepper.
4998 * Iterating over entire database in NIS can be slow. With the
4999 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5000 to trade time for memory. The entire database will be read at once.
5001 Implemented by Ulrich Drepper.
5003 * The interfaces introduced in RFC 3542 have been implemented by
5006 * Support for the new ELF hash table format was added by Ulrich Drepper.
5008 * Support for priority inheritance mutexes added by Jakub Jelinek and
5011 * Support for priority protected mutexes added by Jakub Jelinek.
5013 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5014 or_IN, csb_PL, fy_NL, sr_ME.
5018 * More overflow detection functions.
5020 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5021 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5023 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5024 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5025 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5026 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5027 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5028 by Masahide Washizawa.
5030 * It is now possible to install audit libraries for the dynamic linker using
5031 LD_AUDIT. Implemented by Ulrich Drepper.
5033 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5034 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5035 For a libc and libpthread that works well on Linux 2.4 kernels, we
5036 recommend using the stable 2.3 branch.
5038 * The new function open_wmemstream acts like open_memstream,
5039 but uses a wchar_t wide character buffer.
5041 * The new function ppoll is an improved version of poll, similar to pselect.
5043 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5044 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5045 renameat, unlinkat, linkat, symlinkat, readlinkat.
5047 * New Linux kernel system calls: unshare,
5048 inotify_init, inotify_add_watch, inotify_rm_watch.
5050 * The euidaccess function is now also known by the alias eaccess,
5051 for compatibility with some other systems.
5053 * Timezone data updated to 2006b version.
5057 * The following bugs are resolved with this release:
5059 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5060 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5061 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5062 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5063 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5064 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5066 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5068 * As of this release, GCC 4 can be used to compile the C Library.
5070 * Timezone data updated to 2005m version.
5074 * The following bugs are resolved with this release:
5076 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5077 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5078 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5079 777, 787, 821, 822, 823, 825
5081 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5085 * Support for RFC 3678. Real implementations exist only for Linux so far.
5086 Implemented by Ulrich Drepper.
5088 * nscd can now cache entries persistently. Expiring entries are reloaded.
5089 For speedups the cache can be shared in memory with client processes.
5090 Implemented by Ulrich Drepper.
5092 * nscd can now perform SELinux checks.
5093 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5095 * getaddrinfo queries are now cached. Canonical name lookup is performed
5097 Implemented by Ulrich Drepper.
5099 * The nothrow function attribute is used when headers are used by gcc when
5100 compiling C code. This can avoid significant amounts of exception
5103 * The malloc functions perform more error checking and are stricter when
5104 it comes to reacting on errors. The default action is to terminate
5105 the process after showing an error message. Implemented by Ulrich Drepper.
5107 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5108 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5110 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5111 namespaces using the new function dlmopen(). This feature is of course,
5112 like most other dynamic loading functionality, not available in statically
5113 linked applications. Implemented by Ulrich Drepper.
5115 * Low-overhead boundary checking variants of string and some stdio functions
5116 were added. These are to be used in conjunction with a gcc patch by
5117 Jakub Jelinek which adds calls to these functions if possible.
5118 Implemented by Jakub Jelinek and Ulrich Drepper.
5120 * Old code for several operating systems and machine architectures that
5121 have not been in working condition in a long time have been removed from
5122 the main source tree maintained by the GNU C Library's maintainers.
5123 These files are now reside in the separate `ports' source module
5124 that is usable as an add-on when building the library.
5128 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5129 interrogate the dynamic linker, compatible with the Solaris interface.
5131 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5132 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5134 * getifaddrs now uses the netlink interface on Linux to get its information.
5135 Implemented by Thorsten Kukuk.
5137 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5138 Implemented by Ulrich Drepper.
5140 * support for non-executable stacks on x86 has been added. Changes mostly
5143 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5146 * getaddrinfo now performs destination address selection according to
5151 * Thread-safe interfaces for many functions that access locale data
5152 were added in version 2.3, but these features were omitted from NEWS.
5153 Many functions have variants with an `_l' suffix that take a `locale_t'
5154 object as a parameter rather than consulting the current locale.
5155 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5156 create and maintain `locale_t' objects. Additionally, the new function
5157 `uselocale' sets "the current locale" (as used by functions not so
5158 parameterized) set for an individual thread. These features were added
5159 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5161 * The functions getresuid, getresgid, setresuid, and setresgid, which
5162 have long been available on Linux, are now declared in <unistd.h>
5163 and are now also available on the Hurd.
5165 * ELF thread-local storage support (TLS) now works on x86-64.
5167 * The new dynamic string token $LIB is expanded in shared library names.
5168 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5170 * Aldy Hernandez contributed complete software floating point support for
5171 PowerPC machines with no FPU.
5173 * fexecve is implemented on Linux.
5175 * The `btowc' function should work at least twice as fast due to
5176 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5178 * With approriate thread add-ons cancelable functions are now implemented
5179 in libc.so as well. No need to call the function in libpthread. This
5180 change allowed to finally disable the incorrect and expensive handling
5181 of weak definition in ld.so.
5183 * Yet more PLT entries in libc.so have been removed. We finally arrived
5184 at the bare minimum. Startup times improved appropriately.
5186 * Support for the new Linux/x86 system call interface was added. The
5187 AT_SYSINFO auxiliary vector entry is recognized and handled.
5191 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5194 * iconv (the program and the interface) now accepts empty names (excluding
5195 options like //TRANSLIT) to mean "use charset of current locale".
5197 * localedef can now transliterate characters in strings which are not in
5198 the provided charmap. The information from the input locale is used.
5200 * Prelinking support was added for ELF targets. This requires additional
5201 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5203 * Read-only stdio streams now use mmap to speed up operation by eliminating
5204 copying and buffer underflows. To use add 'm' to the mode string of
5205 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5207 * The malloc functions were completely rewritten by Wolfram Gloger based
5208 on Doug Lea's malloc-2.7.0.c.
5210 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5211 implementation of regex.
5213 * Bruno Haible upgraded the iconv and locale implementation to support
5216 * Contents of the LC_* and LANG environment variables in the CEN style are
5217 not recognized anymore. It never was used. Change by Ulrich Drepper.
5219 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5220 thread-local storage (TLS) ABI on some platforms.
5221 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5223 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5224 EUC-JISX0213, and TSCII.
5226 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5227 BSD-compatible interface for getting all network interface addresses.
5228 Implementation for IPv4 by Roland McGrath.
5230 * Loading of locale data is faster due to the introduction of a locale
5231 archive. Implemented by Roland McGrath and Ulrich Drepper.
5233 * Startup times are significantly reduced by not using exported functions
5234 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5237 * Steven Munroe contributed a port to PowerPC64/Linux.
5241 * The Hurd now uses the GNU libio implementation of stdio rather than the
5242 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5244 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5245 with the same behavior as the Linux system call of the same name.
5249 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5250 128-bit long double format.
5252 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5253 IBM1161, and IBM1162 charsets.
5255 * Andreas Jaeger contributed a port to x86-64/Linux.
5257 * Peter Bruin contributed a port to PowerPC/Hurd.
5259 * libc functions using I/O streams now can handle wide-oriented streams
5262 * optimizations in the dynamic linker. Binaries created by recent binutils
5263 versions start up quicker due to reduced time spent on relocations.
5265 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5269 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5270 asinh, atanh, j0 for the 128-bit long double format.
5272 * Bruno Haible updated all the code handling Unicode in some form to
5273 support Unicode 3.1.
5275 * Speed of regex for single-byte locales is back to previous levels.
5276 Patch by Isamu Hasegawa.
5278 * Alpha, SPARC, and IA-64 now also using floating stacks.
5280 * Startup time of internationalized applications greatly improved through
5281 iconv cache. Use iconvconfig to generate the cache file.
5282 Contributed by Ulrich Drepper.
5284 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5285 severe performance problems. Patch by David Mosberger.
5287 * The Hurd port got a lot more functionality like AIO, various stdio
5288 extensions, etc. Mainly done by Roland McGrath.
5290 * mtrace can now lookup symbols in shared libraries.
5294 * Intel's IA-64 math library is largely integrated. It provides fast and
5295 accurate implementatations for most basic and standard math functions
5296 in float, double, and long double format.
5298 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5299 and asin for the 96-bit long double format and asin, log, tan for the
5300 128-bit long double format.
5302 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5303 The basic double functions exist today. Contributed by Abraham Ziv
5304 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5305 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5307 * An asynchronous name lookup library was added. The interface is designed
5308 after POSIX AIO. The proposal was circulated beforehand to get comments.
5309 No negative ones came in. Implemented by Ulrich Drepper.
5311 * Port to S390/64bit contributed by Martin Schwidefsky
5312 <schwidefsky@de.ibm.com>.
5314 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5315 of functions for Linux/IA-64.
5317 * The RPC code is now thread safe. Threads can now use the same service
5318 of different services at the same time. Patch by Eric Norum
5319 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5321 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5322 family of functions for Linux/S390.
5324 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5325 of functions for Linux/x86.
5327 * Port to Linux/CRIS contributed by Axis Communications.
5331 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5332 we can now check for namespace violations and missing declarations. The
5333 result is that almost all headers are now Unix-compliant (as defined in
5334 the upcoming XPG6). The negative side is that some programs might need
5335 corrections, too, if they depend on the incorrect form of the headers in
5336 previous versions which defined too many symbols and included too many
5339 * regex now handles multibyte character sets correctly.
5340 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5342 * iconv (the program) does now conform to the upcoming XPG6 and handles
5343 charmaps. Instead of the charset names the path of charmaps can be
5344 provided and the conversion happens based on this data.
5345 Contributed by Ulrich Drepper.
5347 * The locale program now provides detailed information about the installed
5352 only lists the names of the supported locales
5356 provides details such as country, language, and codeset name.
5357 Contributed by Ulrich Drepper.
5361 * The gencat program now parses the input file according to the charset
5362 selected by the LC_CTYPE category. This is important for stateful
5363 character sets. To make generating catalogs easier there is a way
5364 to overwrite the charset selected by the locale: before the first
5365 message or $ quote line the catalog can contain a line like
5367 $ codeset=ISO-8859-2
5369 to select the charset (ISO-8859-2 in this case).
5371 Implemented by Shinya Hanataka and Ulrich Drepper.
5373 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5374 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5375 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5377 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5378 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5380 * The LANGUAGE environment variable is now ignored unless the locale is
5381 changed from the default "C" locale.
5383 * The usual bug fixes.
5387 * Greg McGary added runtime support for bounds checking using gcc's
5388 new -fbounded-pointers option. ix86 target is complete. PowerPC
5391 * Thorsten Kukuk added secure mode support to nscd.
5393 * The Berkeley db libraries have been removed.
5395 Related, the nss_db module is now in a separate package since it
5396 obviously requires a database library being available.
5398 * Wide character I/O streams implemented by Ulrich Drepper.
5400 * Functions from the extended socket API added by Ulrich Drepper.
5402 * Functions feenableexcept and fedisableexcept to control the
5403 behaviour of individual exceptions have been added by Andreas Jaeger.
5405 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5407 * The resolver code has been updated from bind 8.2.3-T5B which supports
5408 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5411 This change could in some situations effect backward compatibility. Since
5412 now `_res' is a thread-local instead of a global variable, modifying it
5413 in one thread does not have any effect in other threads.
5415 The resolver library was also extended to allow IPv6 as the transport
5416 protocol for the requests. This work was done by Stig Venaas.
5418 * Compatibility code for K&R C compilers has been removed from the
5419 header files. A ISO C compiler is needed to use the library
5420 (conforming to either C89 or C99 standard).
5422 * Complete rewrite of the localedef program to support multibyte character
5423 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5424 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5425 Implemented by Ulrich Drepper.
5427 Bruno Haible significantly improved the generation and use of the data
5428 structures for the wide character tables.
5430 * Plural handling in gettext implemented by Ulrich Drepper.
5432 * The utmp daemon has been removed.
5434 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5436 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5439 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5441 * POSIX barriers implemented by Kaz Kylheku.
5443 * POSIX spawn function family implemented by Ulrich Drepper.
5445 * POSIX spinlocks are now available.
5447 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5449 * the configure option --enable-kernel=X.Y.Z allows to strip out
5450 compatibility for kernel versions before X.Y.Z. This is currently only
5451 implemented for Linux.
5453 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5454 field sin6_scope_id. This means that all programs using IPv6 should be
5455 recompiled. Don't expect binary compatibility with previous glibc
5458 * various conversion modules for IBM character sets contributed by
5461 * IA-64 port by Jes Sorensen and HJ Lu.
5475 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5477 * New xdr functions are added; some rpc functions are now 64bit clean.
5479 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5481 * Fixed known incompatibilities with glibc 2.0.
5483 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5485 * Optimized a number of functions (especially the ELF dynamic loader).
5487 * Update timezone data files.
5489 * lots of charmaps corrections
5491 * some new locale definitions and charmaps
5496 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5497 conform to POSIX member type requirements. Symbol versions have been
5498 adjusted as needed within the library, and for direct use by applications,
5499 but there is potential for problems if third-party libraries use
5500 struct timeval as part of their interface. This does not present
5501 a problem for X and other "essential" system libraries.
5503 * An additional locale model to support C++ Standard Library locale
5504 model and probably more was implemented by Ulrich Drepper.
5506 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5509 * Miles Bader provided the `argp' function family to support hierachical
5510 command line argument parsing, layered on top of getopt.
5512 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5514 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5517 * scanf recognizes the %a and %A format for scanning floating point numbers.
5519 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5520 information and interfaces for the available integer types.
5522 * about 130 new math functions were added to implement the ISO C9x math
5525 * the new header <complex.h> contains definitions of the complex math
5526 functions from ISO C 9X.
5528 * the new header <tgmath.h> defines generic macros to use complex or
5529 real valued functions.
5531 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5533 * Andreas Jaeger provided a test suite for the math library.
5535 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5537 * Ulrich Drepper added character set conversion functions (iconv).
5539 * Optimized string functions have been added.
5541 * The localedata addon is now part of glibc.
5543 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5545 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5546 daemon for NSS (nscd).
5548 Missing a better place here are some numbers on improvements. Under
5549 Linux 2.1.125 un-tar-ing the kernel sources takes
5553 using local files 12.19s 6.88s 22.91s
5555 using NIS 13.92s 8.91s 26.34s
5557 using NIS & nscd 10.37s 7.34s 25.30s
5559 using NIS+ 27.57s 30.37s 640.46s
5561 using NIS+ & nscd 10.25s 7.83s 26.51s
5563 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5565 Keep in mind that non-namelookup related operations dominate above times.
5566 It was just a common complain that using NIS+ unpacking the kernel is
5569 [1] The old nscd implementation is not available anymore since it was
5570 distributed with glibc up to version 2.0.98 and thus is now replaced.
5572 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5574 * Mark Kettenis provided a Hesiod NSS module.
5576 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5577 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5579 * rcmd can now handle netgroups (Dick Streefland).
5581 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5584 * Support for the IPv6 protocol has been added to the socket API, as per the
5585 latest draft standards.
5587 * Support for Linux 2.2 has been added.
5589 * Interface changes relative to the latest 2.0.x release:
5590 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5591 addseverity NEW: Unix98
5592 alphasort64 NEW: LFS
5593 argp_err_exit_status NEW: argp, GNU ext
5594 argp_error NEW: argp, GNU ext
5595 argp_failure NEW: argp, GNU ext
5596 argp_help NEW: argp, GNU ext
5597 argp_parse NEW: argp, GNU ext
5598 argp_program_bug_address NEW: argp, GNU ext
5599 argp_program_version NEW: argp, GNU ext
5600 argp_program_version_hook NEW: argp, GNU ext
5601 argp_state_help NEW: argp, GNU ext
5602 argp_usage NEW: argp, GNU ext
5603 authdes_create NEW: Secure RPC
5604 authdes_getucred NEW: Secure RPC
5605 authdes_pk_create NEW: Secure RPC
5606 backtrace NEW: GNU ext.
5607 backtrace_symbols NEW: GNU ext.
5608 backtrace_symbols_fd NEW: GNU ext.
5610 cacosf NEW: ISO C 9x
5611 cacosh NEW: ISO C 9x
5612 cacoshf NEW: ISO C 9x
5613 cacoshl NEW: ISO C 9x
5614 cacosl NEW: ISO C 9x
5621 casinf NEW: ISO C 9x
5622 casinh NEW: ISO C 9x
5623 casinhf NEW: ISO C 9x
5624 casinhl NEW: ISO C 9x
5625 casinl NEW: ISO C 9x
5627 catanf NEW: ISO C 9x
5628 catanh NEW: ISO C 9x
5629 catanhf NEW: ISO C 9x
5630 catanhl NEW: ISO C 9x
5631 catanl NEW: ISO C 9x
5632 cbc_crypt NEW: Secure RPC
5636 ccoshf NEW: ISO C 9x
5637 ccoshl NEW: ISO C 9x
5643 cimagf NEW: ISO C 9x
5644 cimagl NEW: ISO C 9x
5645 clearerr_locked REMOVED
5646 clntunix_create NEW: sunrpc ext
5648 clog10 NEW: ISO C 9x
5649 clog10f NEW: ISO C 9x
5650 clog10l NEW: ISO C 9x
5660 cprojf NEW: ISO C 9x
5661 cprojl NEW: ISO C 9x
5663 crealf NEW: ISO C 9x
5664 creall NEW: ISO C 9x
5669 csinhf NEW: ISO C 9x
5670 csinhl NEW: ISO C 9x
5673 csqrtf NEW: ISO C 9x
5674 csqrtl NEW: ISO C 9x
5678 ctanhf NEW: ISO C 9x
5679 ctanhl NEW: ISO C 9x
5681 des_setparity NEW: Secure RPC
5682 ecb_crypt NEW: Secure RPC
5683 endutxent NEW: Unix98
5685 exp10f NEW: ISO C 9x
5686 exp10l NEW: ISO C 9x
5690 fattach NEW: STREAMS
5691 fdetach NEW: STREAMS
5695 feclearexcept NEW: ISO C 9x
5696 fegetenv NEW: ISO C 9x
5697 fegetexceptflag NEW: ISO C 9x
5698 fegetround NEW: ISO C 9x
5699 feholdexcept NEW: ISO C 9x
5701 feraiseexcept NEW: ISO C 9x
5702 ferror_locked REMOVED
5703 fesetenv NEW: ISO C 9x
5704 fesetexceptflag NEW: ISO C 9x
5705 fesetround NEW: ISO C 9x
5706 fetestexcept NEW: ISO C 9x
5707 feupdateenv NEW: ISO C 9x
5708 fflush_locked REMOVED
5712 fgets_unlocked NEW: GNU ext.
5713 fileno_locked REMOVED
5725 fputc_locked REMOVED
5726 fputs_unlocked NEW: GNU ext.
5727 fread_unlocked NEW: GNU ext.
5732 fstatvfs NEW: Unix98
5736 ftruncate64 NEW: LFS
5738 fwrite_unlocked NEW: GNU ext.
5739 gai_strerror NEW: IPv6
5743 getchar_locked REMOVED
5745 getdate_err NEW: Unix98
5746 getdate_r NEW: GNU ext.
5748 getnameinfo NEW: IPv6
5749 getnetname NEW: Secure RPC
5750 getpmsg NEW: STREAMS
5751 getpt NEW: Unix98 PTY
5752 getrlimit64 NEW: LFS
5753 getutxent NEW: Unix98
5754 getutxid NEW: Unix98
5755 getutxline NEW: Unix98
5756 glob64 NEW: GNU ext.
5757 globfree64 NEW: GNU ext.
5758 gnu_get_libc_release NEW: GNU ext.
5759 gnu_get_libc_version NEW: GNU ext.
5760 grantpt NEW: Unix98 PTY
5761 host2netname NEW: Secure RPC
5763 iconv_close NEW: iconv
5764 iconv_open NEW: iconv
5765 if_freenameindex NEW: IPv6
5766 if_indextoname NEW: IPv6
5767 if_nameindex NEW: IPv6
5768 if_nametoindex NEW: IPv6
5769 in6addr_any NEW: IPv6
5770 in6addr_loopback NEW: IPv6
5771 inet6_isipv4mapped NEW: IPv6
5772 isastream NEW: STREAMS
5773 iswblank NEW: GNU ext.
5774 key_decryptsession NEW: Secure RPC
5775 key_decryptsession_pk NEW: Secure RPC
5776 key_encryptsession NEW: Secure RPC
5777 key_encryptsession_pk NEW: Secure RPC
5778 key_gendes NEW: Secure RPC
5779 key_get_conv NEW: Secure RPC
5780 key_secretkey_is_set NEW: Secure RPC
5781 key_setnet NEW: Secure RPC
5782 key_setsecret NEW: Secure RPC
5783 llrint NEW: ISO C 9x
5784 llrintf NEW: ISO C 9x
5785 llrintl NEW: ISO C 9x
5786 llround NEW: ISO C 9x
5787 llroundf NEW: ISO C 9x
5788 llroundl NEW: ISO C 9x
5793 lrintf NEW: ISO C 9x
5794 lrintl NEW: ISO C 9x
5795 lround NEW: ISO C 9x
5796 lroundf NEW: ISO C 9x
5797 lroundl NEW: ISO C 9x
5799 makecontext NEW: Unix98
5800 mempcpy NEW: GNU ext.
5803 modify_ldt NEW: kernel
5807 nearbyint NEW: ISO C 9x
5808 nearbyintf NEW: ISO C 9x
5809 nearbyintl NEW: ISO C 9x
5810 netname2host NEW: Secure RPC
5811 netname2user NEW: Secure RPC
5812 nexttoward NEW: ISO C 9x
5813 nexttowardf NEW: ISO C 9x
5814 nexttowardl NEW: ISO C 9x
5818 passwd2des NEW: Secure RPC
5820 pow10f NEW: GNU ext.
5821 pow10l NEW: GNU ext.
5824 printf_size NEW: GNU ext.
5825 printf_size_info NEW: GNU ext.
5826 profil_counter REMOVED
5827 pthread_mutexattr_getkind_np REPLACED
5828 pthread_mutexattr_setkind_np REPLACED
5829 ptsname NEW: Unix98 PTY
5830 ptsname_r NEW: Unix98 PTY
5832 putchar_locked REMOVED
5833 putgrent NEW: GNU ext.
5835 putpmsg NEW: STREAMS
5836 pututxline NEW: Unix98
5840 readdir64_r NEW: LFS
5841 remquo NEW: ISO C 9x
5842 remquof NEW: ISO C 9x
5843 remquol NEW: ISO C 9x
5845 roundf NEW: ISO C 9x
5846 roundl NEW: ISO C 9x
5848 scalbln NEW: ISO C 9x
5849 scalblnf NEW: ISO C 9x
5850 scalblnl NEW: ISO C 9x
5852 sendfile NEW: kernel
5853 setcontext NEW: Unix98
5854 setrlimit64 NEW: LFS
5855 setutxent NEW: Unix98
5857 sigignore NEW: Unix98
5858 sigqueue NEW: POSIX.1b
5859 sigrelse NEW: Unix98
5860 sigset NEW: POSIX.1b
5861 sigtimedwait NEW: POSIX.1b
5862 sigwaitinfo NEW: POSIX.1b
5863 sincos NEW: GNU ext.
5864 sincosf NEW: GNU ext.
5865 sincosl NEW: GNU ext.
5869 strcasestr NEW: GNU ext.
5870 strtoimax NEW: ISO C 9x
5871 strtoumax NEW: ISO C 9x
5872 strverscmp NEW: GNU ext.
5873 svcauthdes_stats NEW: Secure RPC
5874 svcunix_create NEW: sunrpc etx
5875 svcunixfd_create NEW: sunrpc ext
5876 swapcontext NEW: Unix98
5877 tcgetsid NEW: Unix98 PTY
5878 tdestroy NEW: GNU ext.
5879 tgamma NEW: ISO C 9x
5880 tgammaf NEW: ISO C 9x
5881 tgammal NEW: ISO C 9x
5885 truncf NEW: ISO C 9x
5886 truncl NEW: ISO C 9x
5888 unlockpt NEW: Unix98 PTY
5889 updwtmpx NEW: Unix98
5890 user2netname NEW: Secure RPC
5891 utmpxname NEW: Unix98
5892 versionsort NEW: GNU ext.
5893 versionsort64 NEW: GNU ext.
5895 wcscasecmp NEW: GNU ext.
5896 wcsncasecmp NEW: GNU ext.
5897 wcsnlen NEW: GNU ext.
5898 wcstoimax NEW: ISO C 9x
5899 wcstoll NEW: ISO C 9x
5900 wcstoull NEW: ISO C 9x
5901 wcstoumax NEW: ISO C 9x
5903 wordexp NEW: POSIX.2
5904 wordfree NEW: POSIX.2
5905 write_profiling REMOVED
5906 xdecrypt NEW: Secure RPC
5907 xdr_authdes_cred NEW: Secure RPC
5908 xdr_authdes_verf NEW: Secure RPC
5909 xdr_cryptkeyarg NEW: Secure RPC
5910 xdr_cryptkeyarg2 NEW: Secure RPC
5911 xdr_cryptkeyres NEW: Secure RPC
5912 xdr_getcredres NEW: Secure RPC
5913 xdr_key_netstarg NEW: Secure RPC
5914 xdr_key_netstres NEW: Secure RPC
5915 xdr_keybuf NEW: Secure RPC
5916 xdr_keystatus NEW: Secure RPC
5917 xdr_netnamestr NEW: Secure RPC
5918 xdr_sizeof NEW: Secure RPC
5919 xdr_unixcred NEW: sunrpc ext
5920 xencrypt NEW: Secure RPC
5921 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5932 * inet_ntoa is thread-safe
5934 * updwtmp is moved from libutil to libc
5936 * rewrite of cbrt function
5938 * update of timezone data
5952 * add atoll function
5954 * fix complex problems in Berkeley DB code
5956 * fix math functions
5960 * fixed lots of header problems (especially Linux/GNU specific)
5962 * dynamic loader preserves all registers
5964 * Roland McGrath provided support for handling of auxiliary objects in
5965 the ELF dynamic loader.
5967 * support for parallel builds is improved
5971 * GNU extensions are no longer declared by default. To enable them you
5972 must define the macro `_GNU_SOURCE' in your program or compile with
5975 * The library has changed from using GNU ld symbol aliases to using weak
5976 symbols where available. The ELF object file format supports weak
5977 symbols; GNU ld also supports weak symbols in the a.out format. (There
5978 is also now support for other GNU ld extensions in ELF. Use the
5979 `--with-elf' option to configure to indicate you have ELF, and
5980 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5981 of many files which contained only symbol aliases, reducing the size of
5982 the source and the compiled library; many other files were renamed to
5983 less cryptic names previously occupied by the symbol alias files.
5984 There is a new header file <elf.h> for programs which operate on
5985 files in the ELF format.
5987 * Converted to Autoconf version 2, so `configure' has more options.
5988 Run `configure --help' to see the details.
5990 * The library can now be configured to build profiling, highly-optimized
5991 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5992 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5993 `configure' enable building these extra libraries. The shared library is
5994 built by default when using both ELF and GNU ld. When shared libraries
5995 are enabled, the new library `-ldl' is available for arbitrary run-time
5996 loading of shared objects; its interface is defined in <dlfcn.h>. The
5997 new header file <link.h> gives access to the internals of the run-time
5998 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5999 application of same name on other systems and it provides information
6000 about dynamically linked binaries.
6002 * The C library now provides the run-time support code for profiling
6003 executables compiled with `-pg'. Programs can control the profiling code
6004 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6005 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6006 the support for this file format was contributed by David Mosberger-Tang.
6008 * The math code has been replaced with a math library based on fdlibm from
6009 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6010 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6011 functions. The math functions now reside in a separate library, so
6012 programs using them will need to use `-lm' their linking commands.
6014 * John C. Bowman contributed optimized ix87 assembler inline functions.
6016 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6017 mechanism similar to that found in Solaris 2. This is now used for the
6018 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6019 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6020 file controls what services are used for each individual database. This
6021 works by loading shared libraries with names specified in `nsswitch.conf',
6022 so service modules can be changed or added at any time without even
6023 relinking any program. Currently there are the file, db, and NIS based
6024 NSS services available.
6026 * The new functions `strtoq' and `strtouq' parse integer values from
6027 strings, like `strtol' and `strtoul', but they return `long long int' and
6028 `unsigned long long int' values, respectively (64-bit quantities).
6030 * The new functions `strtof' and `strtold' parse floating-point values from
6031 strings, like `strtod', but they return `float' and `long double' values,
6032 respectively (on some machines `double' and `long double' are the same).
6034 * Ulrich Drepper has contributed new implementations of the floating-point
6035 printing and reading code used in the `printf' family of functions and
6036 `strtod', `strtof', and `strtold'. These new functions are perfectly
6037 accurate, and much faster than the old ones.
6039 * The implementation of the POSIX locale model was completely rewritten by
6040 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6041 to compile the POSIX locale definition.
6043 * The former dummy implementations of the strcoll and strxfrm function are
6044 now replaced by fully functional code contributed by Ulrich Drepper. The
6045 collation information comes from the POSIX locale definitions.
6047 * The new header <langinfo.h> defines an interface for accessing
6048 various locale-dependent data (using the locale chosen with `setlocale').
6050 * Ulrich Drepper has contributed a new suite of functions for operation on
6051 wide-character and multibyte-character strings, in <wchar.h>;
6052 and classification and case conversion of wide characters, in <wctype.h>.
6053 These new functions are conforming to the ISO C, Amendement 1 specification.
6055 * There is now a second implementation of the standard I/O library available.
6056 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6057 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6059 * You can now use positional parameter specifications in format strings
6060 for the `printf' and `scanf' families of functions. For example,
6061 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6062 ``Number 6, Mr Jones''. This is mainly useful when providing different
6063 format strings for different languages, whose grammars may dictate
6064 different orderings of the values being printed. To support this
6065 feature, the interface for `register_printf_handler' has changed; see
6066 the header file <printf.h> for details.
6068 * The `printf' and `scanf' families of functions now understand a new
6069 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6070 to group numbers as indicated by the locale; for `scanf' and friends, this
6071 says to accept as valid only a number with all the proper grouping
6072 separators in the right places. In the default "C" locale, numbers are
6073 not grouped; but locales for specific countries will define the usual
6074 conventions (i.e. separate thousands with `,' in the US locale).
6076 * The pgrp functions have been regularized, slightly incompatibly but much
6077 less confusingly. The core functions are now `getpgid' and `setpgid',
6078 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6079 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6080 provided for compatibility. There is no longer an incompatible `getpgrp'
6081 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6083 * The new header file <fts.h> and suite of functions simplify programs that
6084 operate on directory trees. This code comes from 4.4 BSD.
6086 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6087 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6088 NSS scheme used in glibc.
6090 * There is a new malloc debugging hook `__memalign_hook'.
6092 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6093 `unsigned int' in <sys/types.h>. These are for compatibility only and
6094 their use is discouraged.
6096 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6097 done differently, so that it works even without GNU ld.
6099 * New function `euidaccess' checks allowed access to a file like `access',
6100 but using the effective IDs instead of the real IDs.
6102 * The time zone data files have been updated for the latest and greatest
6103 local time conventions of the countries of the world.
6105 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6108 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6109 for formatting floating-point numbers. They are provided only for
6110 compatibility; new programs should use `sprintf' instead. There are
6111 also equivalent function for the `long double' floating-point type and
6112 all functions also exist in a reentrant form.
6114 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6115 functions for maintaining the login-record files (primarily of use to
6116 system programs such as `login'), and convenient functions for
6117 allocating and initializing a pseudo-terminal (pty) device.
6119 * Ulrich Drepper has contributed new support for System V style
6120 shared memory and IPC on systems that support it.
6122 * Ulrich Drepper has contributed several miscellaneous new functions found
6123 in System V: The `hsearch' family of functions provide an effective
6124 implementation of hash tables; `a64l' and `l64a' provide a very simple
6125 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6128 * Ulrich Drepper has contributed new reentrant counterparts for the
6129 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6131 * Ulrich Drepper has contributed new, highly-optimized versions of several
6132 string functions for the i486/Pentium family of processors.
6134 * Ulrich Drepper has updated the Linux-specific code, based largely
6135 on work done in Hongjiu Lu's version of GNU libc for Linux.
6136 The GNU library now supports Linux versions 2.0.10 and later,
6137 using the ELF object file format (i[3456]86-*-linux).
6139 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6141 * David Mosberger-Tang and Richard Henderson have ported the C library
6142 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6143 dynamic linking support for ELF/Alpha.
6145 * Richard Henderson contributed several Alpha optimized assembler function
6146 for arithmetic and string handling.
6148 * Ulrich Drepper has contributed a new set of message catalog functions to
6149 support multiple languages using the <libintl.h> interface, for use with
6150 his new package GNU gettext. Translation volunteers have contributed
6151 catalogs of the library's messages in Spanish, German, and Korean.
6153 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6154 program and the `catgets' function for reading the catalog files it
6155 creates. (The <libintl.h> interface is preferred; we include the
6156 <nl_types.h> interface using `catgets' only for source compatibility with
6157 programs already written to use it.)
6159 * New header file <values.h> gives SVID-compatible names for <limits.h>
6162 * Various new macros, declarations, and small header files for compatibility
6165 * New function `group_member' is a convenient way to check if a process has
6166 a given effective group ID.
6168 * When using GCC 2.7 and later, the socket functions are now declared in a
6169 special way so that passing an argument of type `struct sockaddr_in *',
6170 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6171 `struct sockaddr *' type, does not generate a type-clash warning.
6173 * New function `error' declared in header file <error.h> is a convenient
6174 function for printing error messages and optionally exiting; this is the
6175 canonical function used in GNU programs. The new functions `err', `warn',
6176 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6177 doing the same thing.
6179 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6180 POSIX.2 `glob' function to do ~ and {...} expansion.
6182 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6183 `clearenv' which is used in POSIX.9 is also available.
6185 * New function `getsid' returns session ID number on systems that support it.
6187 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6188 files <db.h> and <mpool.h> provide a rich set of functions for several
6189 types of simple databases stored in memory and in files, and <ndbm.h> is
6190 an old `ndbm'-compatible interface using the `db' functions. Link with
6191 `-ldb' to get these functions.
6193 * New macro `strdupa' copies a string like `strdup', but uses local stack
6194 space from `alloca' instead of dynamic heap space from `malloc'.
6196 * New function `strnlen' is like `strlen' but searches only a given maximum
6197 number of characters for the null terminator. `stpncpy', `strndup' and
6198 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6201 * New function `statfs' in header <sys/statfs.h>.
6203 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6204 provide convenient functions for operating on blocks of null-terminated
6207 * A new suite of functions in <utmp.h> handle all the details of reading
6208 and writing the utmp file.
6210 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6213 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6214 completely POSIX compliant and also implemented the extended functionality
6215 to handle alternate digit representation and alternate era date formats.
6217 * Ulrich Drepper provided an implementation of the `strptime' function
6218 defined in XPG4.2 which transforms a string into a `struct tm' value.
6220 * Paul Eggert provided the tzselect shell script as part of the timezone
6221 code. The shell script makes it easy to select the correct timezone
6224 * The implementation of the malloc family of functions is completely replaced
6225 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6226 The implementation uses the mmap function (if available) and it is
6227 optimized for the use in multi threaded programs.
6229 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6230 functions. This new functionality is usable by specifying a special
6231 salt string and it is compatible with implementation on *BSD systems.
6233 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6234 `getsubopt' to handle second level command line options, `bsd_signal'
6235 to access BSD style `signal' functionality, the obsolete `regexp' style
6238 * the `lchown' function is available on system which support this
6241 * The implementation of the shadow password handling function was contributed
6244 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6246 * POSIX.1g support was added. The <sys/select.h> header is available,
6247 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6248 implementation of `getaddrinfo'.
6252 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6254 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6255 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6257 * The new function `daemon' from 4.4 BSD is useful for server programs that
6258 want to put themselves in the background.
6260 * Joel Sherrill has contributed support for several standalone boards that
6261 run without an operating system.
6263 * `printf', `scanf' and friends now accept a `q' type modifier for long
6264 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6266 * All of the code taken from BSD (notably most of the math and networking
6267 routines) has been updated from the BSD 4.4-Lite release.
6269 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6271 * The new functions `getdomainname' and `setdomainname' fetch or change the
6272 YP/NIS domain name. These are system calls which exist on systems which
6275 * The time zone data files have been updated for the latest international
6278 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6279 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6283 * The C library now includes support for Sun RPC, from Sun's free
6284 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6285 are included. (There is still no support for YP.)
6287 * Tom Quinn has contributed a port of the C library to SGI machines running
6288 Irix 4 (mips-sgi-irix4).
6290 * The new `lockf' function is a simplified interface to the locking
6291 facilities of `fcntl', included for compatibility.
6293 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6295 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6297 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6300 * The error message printed by `assert' for a failed assertion now includes
6301 the name of the program (if using GNU ld) and the name of the calling
6302 function (with versions of GCC that support this).
6304 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6306 * The library now includes the <sys/mman.h> header file and memory
6307 management functions `mmap', `munmap', `mprotect', `msync', and
6308 `madvise', on systems that support those facilities.
6310 * The interface for `mcheck' has changed slightly: the function called to
6311 abort the program when an allocation inconsistency is detected now takes
6312 an argument that indicates the type of failure. The new function
6313 `mprobe' lets you request a consistency check for a particular block at
6314 any time (checks are normally done only when you call `free' or `realloc'
6317 * It is now possible to easily cross-compile the C library, building on one
6318 system a library to run on another machine and/or operating system. All
6319 you need to do is set the variable `HOST_CC' in `configparms' to the
6320 native compiler for programs to run on the machine you are building on (a
6321 few generator programs are used on Unix systems); set `CC' to the
6324 * The new function `fexecve' (only implemented on the GNU system) executes
6325 a program file given a file descriptor already open on the file.
6329 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6330 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6332 * You can set the variable `libprefix' in `configparms' to specify a prefix
6333 to be prepended to installed library files; this makes it easy to install
6334 the GNU C library to be linked as `-lgnuc' or whatever.
6336 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6337 copies a limited number of characters from a string, and returns the
6338 address of the last character written.
6340 * You no longer need to check for whether the installed `stddef.h' is
6341 compatible with the GNU C library. configure now checks for you.
6343 * You can now define a per-stream `fileno' function to convert the
6344 stream's cookie into an integral file descriptor.
6346 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6347 allocates zero bytes of storage, and returns a unique pointer which
6348 you can pass to `realloc' or `free'. The behavior is undefined if
6349 you dereference this pointer.
6351 * The C library now runs on Sony NEWS m68k machines running either
6352 NewsOS 3 or NewsOS 4.
6354 * The new `syscall' function is a system-dependent primitive function
6355 for invoking system calls. It has the canonical behavior on Unix
6356 systems, including unreliable return values for some calls (such as
6357 `pipe', `fork' and `getppid').
6359 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6360 to `EAGAIN', which is the preferred name. On systems whose kernels
6361 use two distinct codes, the C library now translates EWOULDBLOCK to
6362 EAGAIN in every system call function.
6366 * The GNU C Library Reference Manual is now distributed with the library.
6367 `make dvi' will produce a DVI file of the printed manual.
6368 `make info' will produce Info files that you can read on line using C-h i
6369 in Emacs or the `info' program.
6370 Please send comments on the manual to bug-glibc-manual@gnu.org.
6372 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6374 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6376 * Jason Merrill has contributed a port to the Sequent Symmetry running
6377 Dynix version 3 (i386-sequent-dynix).
6379 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6380 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6382 * New function `memory_warnings' lets you arrange to get warnings when
6383 malloc is running out of memory to allocate, like Emacs gives you.
6385 * The C library now contains the relocating allocator used in Emacs 19 for
6386 its editing buffers. This allocator (ralloc) minimizes allocation
6387 overhead and fragmentation by moving allocated regions around whenever it
6388 needs to. You always refer to a ralloc'd region with a "handle" (a
6389 pointer to a pointer--an object of type `void **').
6391 * There is a new `printf' format: `%m' gives you the string corresponding
6392 to the error code in `errno'.
6394 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6395 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6396 pass, the `a' modifier says to fill in a `char **' you pass with a
6399 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6400 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6401 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6403 * `mkstemp' is a traditional Unix function to atomically create and open a
6404 uniquely-named temporary file.
6408 * The standard location for the file that says what the local timezone is
6409 has changed again. It is now `/usr/local/etc/localtime' (or more
6410 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6412 * The distribution no longer contains any files with names longer than 14
6415 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6416 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6418 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6422 * The configuration process has changed quite a bit. The `configure'
6423 script is now used just like the configuration scripts for other GNU
6424 packages. The `sysdeps' directory hierarchy is much rearranged.
6425 The file `INSTALL' explains the new scheme in detail.
6427 * The header files no longer need to be processed into ANSI C and
6428 traditional C versions. There is just one set of files to install, and
6429 it will work with ANSI or old C compilers (including `gcc -traditional').
6431 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6432 MIPS DECStation running Ultrix 4.
6434 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6435 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6436 made itself into a shared library.
6438 * Yet further improved support for the i386, running 4.3 BSD-like systems
6439 (such as Mach 3 with the Unix single-server), or System V.
6441 * New function `strncasecmp' to do case-insensitive string comparison
6442 with limited length.
6444 * New function `strsep' is a reentrant alternative to `strtok'.
6446 * New functions `scandir' and `alphasort' for searching directories.
6448 * New function `setenv' is a better interface to `putenv'.
6450 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6451 function for traversing a directory tree.
6453 * The GNU obstack package is now also part of the C library.
6454 The new function `open_obstack_stream' creates a stdio stream that
6455 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6456 formatted output directly to an obstack.
6458 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6459 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6461 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6463 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6464 things to your strings.
6466 * There are some new test programs: test-fseek, testmb, and testrand.
6468 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6469 These ports are not finished, but are a good starting place for really
6470 supporting those systems.
6472 * `/etc/localtime' is now the standard location for the file that says what
6473 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6474 This follows the general principle that `/etc' is the place for all local
6475 configuration files.
6477 * The C library header files now use `extern "C"' when used by the C++
6478 compiler, so the C library should now work with C++ code.
6480 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6481 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6484 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6485 function which uses the `merge sort' algorithm, and is said to be
6486 significantly faster than the old GNU `qsort' function. Merge sort is
6487 now the standard `qsort' function. The new algorithm can require a lot
6488 of temporary storage; so, the old sorting function is called when the
6489 required storage is not available.
6491 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6492 provides the Unix `crypt' function, plus some other entry points.
6494 * The code and header files taken from 4.4 BSD have been updated with the
6495 latest files released from Berkeley.
6497 ----------------------------------------------------------------------
6500 Permission is granted to anyone to make or distribute verbatim copies
6501 of this document as received, in any medium, provided that the
6502 copyright notice and this permission notice are preserved,
6503 thus giving the recipient permission to redistribute in turn.
6505 Permission is granted to distribute modified versions
6506 of this document, or of portions of it,
6507 under the above conditions, provided also that they
6508 carry prominent notices stating who last changed them.
6511 version-control: never