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 Deprecated and removed features, and other changes affecting compatibility:
19 [Add deprecations, removals and changes affecting compatibility here]
21 Changes to build and runtime requirements:
23 [Add changes to build and runtime requirements here]
25 Security related changes:
27 [Add security related changes here]
29 The following bugs are resolved with this release:
31 [The release manager will add the list generated by
32 scripts/list-fixed-bugs.py just before the release.]
39 * The dynamic linker accepts the --list-tunables argument which prints
40 all the supported tunables. This option is disable if glibc is
41 configured with tunables disabled (--enable-tunables=no).
43 * The dynamic linker accepts the --argv0 argument and provides opportunity
44 to change argv[0] string.
46 * The dynamic linker loads optimized implementations of shared objects
47 from subdirectories under the glibc-hwcaps directory on the library
48 search path if the system's capabilities meet the requirements for
49 that subdirectory. Initially supported subdirectories include
50 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
51 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
52 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
53 subdirectory names correspond to the vendor-independent x86-64
54 microarchitecture levels defined in the x86-64 psABI supplement.
56 * The new --help option of the dynamic linker provides usage and
57 information and library search path diagnostics.
59 * The mallinfo2 function is added to report statistics as per mallinfo,
60 but with larger field widths to accurately report values that are
61 larger than fit in an integer.
63 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
65 * Support for the RISC-V ISA running on Linux has been expanded to run on
66 32-bit hardware. This is supported for the following ISA and ABI pairs:
72 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
75 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
76 glibc may use additional checks that may have an additional performance
77 overhead. At present these checks are available only on LLVM 9 and later.
78 The latest GCC available at this time (10.2) does not support this level of
81 Deprecated and removed features, and other changes affecting compatibility:
83 * The mallinfo function is marked deprecated. Callers should call
86 * When dlopen is used in statically linked programs, alternative library
87 implementations from HWCAP subdirectories are no longer loaded.
88 Instead, the default implementation is used.
90 * The deprecated <sys/vtimes.h> header and the function vtimes have been
91 removed. To support old binaries, the vtimes function continues to exist
92 as a compatibility symbol. Applications should use the getrlimit or
95 * Following a change in the tzdata 2018a release upstream, the zdump
96 program is now installed in the /usr/bin subdirectory. Previously,
97 the /usr/sbin subdirectory was used.
99 * On s390(x), the type float_t is now derived from the macro
100 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
101 hardcoded to double. This does not affect the ABI of any libraries
102 that are part of the GNU C Library, but may affect the ABI of other
103 libraries that use this type in their interfaces. The new definition
104 improves consistency with compiler behavior in many scenarios.
106 * A future version of glibc will stop loading shared objects from the
107 "tls" subdirectories on the library search path, the subdirectory that
108 corresponds to the AT_PLATFORM system name, and also stop employing
109 the legacy AT_HWCAP search mechanism. Applications should switch to
110 the new glibc-hwcaps mechanism instead; if they do not do that, only
111 the baseline version (directly from the search path directory) will be
114 Changes to build and runtime requirements:
116 * On Linux, the system administrator needs to configure /dev/pts with
117 the intended access modes for pseudo-terminals. glibc no longer
118 attemps to adjust permissions of terminal devices. The previous glibc
119 defaults ("tty" group, user read/write and group write) already
120 corresponded to what most systems used, so that grantpt did not
121 perform any adjustments.
123 * On Linux, the posix_openpt and getpt functions no longer attempt to
124 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
125 (and pseudo-terminals are supported), a devpts file system is mounted
126 on /dev/pts. Current systems already meet these requirements.
128 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
130 Security related changes:
132 CVE-2021-3326: An assertion failure during conversion from the
133 ISO-20220-JP-3 character set using the iconv function has been fixed.
134 This assertion was triggered by certain valid inputs in which the
135 converted output contains a combined sequence of two wide characters
136 crossing a buffer boundary. Reported by Tavis Ormandy.
138 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
139 invoked with input containing redundant shift sequences in the IBM1364,
140 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
142 CVE-2020-29562: An assertion failure has been fixed in the iconv function
143 when invoked with UCS4 input containing an invalid character.
145 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
146 invoked with EUC-KR input containing invalid multibyte input sequences.
148 The following bugs are resolved with this release:
150 [10635] libc: realpath portability patches
151 [16124] dynamic-link: ld.so should allow to change argv[0]
152 [17924] malloc: 'free' should not set errno
153 [18683] libc: Linux faccessat implementation can incorrectly ignore
155 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
156 [23249] libc: Epyc and other current AMD CPUs do not select the
157 "haswell" platform subdirectory
158 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
160 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
162 [24941] libc: Make grantpt usable after multi-threaded fork in more
164 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
165 [24973] locale: iconv encounters segmentation fault when converting
166 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
167 [25399] string: undefined reference to `__warn_memset_zero_len' when
168 changing gnuc version
169 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
171 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
173 [25971] libc: s390 bits/hwcap.h out of sync with kernel
174 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
175 [26100] libc: Race in syslog(3) with regards to tag printing.
176 [26124] libc: Export <cpu-features.h>
177 [26130] nscd: Inconsistent nscd cache during pruning
178 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
179 [26224] locale: iconv hangs when converting some invalid inputs from
180 several IBM character sets (CVE-2020-27618)
181 [26341] libc: realpath cyclically call __alloca(path_max) to consume
183 [26343] manual: invalid documented return type for strerrorname_np(),
184 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
185 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
187 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
189 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
190 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
192 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
193 [26553] libc: mtx_init allows type set to "mtx_recursive" only
194 [26555] string: strerrorname_np does not return the documented value
195 [26592] libc: pointer arithmetic overflows in realpath
196 [26600] network: Transaction ID collisions cause slow DNS lookups in
198 [26606] libc: [2.33 Regression] pselect is broken on x32
199 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
200 [26620] glob: fnmatch with collating symbols results in segmentation
202 [26625] libc: [2.33 Regression] CET is disabled
203 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
204 at the end of a memory mapping
205 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
206 by the caller to the kernel
207 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
208 [26647] build: [-Werror=array-parameter=] due to different
209 declarations for __sigsetjmp
210 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
212 [26649] stdio: printf should handle non-normal x86 long double numbers
213 gracefully (CVE-2020-29573)
214 [26686] build: -Warray-parameter instances building with GCC 11
215 [26687] build: -Warray-bounds instances building with GCC 11
216 [26690] stdio: Aliasing violation in __vfscanf_internal
217 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
218 [26726] build: GCC warning calling new_composite_name with an array of
220 [26736] libc: FAIL: misc/tst-sysvshm-linux
221 [26737] libc: Random FAIL: rt/tst-shm
222 [26791] libc: Missing O_CLOEXEC in sysconf.c
223 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
225 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
227 [26818] string: aarch64: string tests may run ifunc variants that are
229 [26821] libc: Memory leak test failures on Fedora 33
230 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
231 FSGSBASE/LM/RDRAND check failure
232 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
234 [26853] libc: aarch64: Missing unwind information in statically linked
236 [26923] locale: Assertion failure in iconv when converting invalid
237 UCS4 (CVE-2020-29562)
238 [26926] dynamic-link: aarch64: library dependencies are not bti
240 [26932] libc: sh: Multiple floating point functions defined as stubs
242 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
244 [26988] dynamic-link: aarch64: BTI mprotect address is not page
246 [27002] build: libc_freeres_fn build failure with GCC 11
247 [27004] dynamic-link: ld.so is miscompiled by GCC 11
248 [27008] dynamic-link: ld.so.cache should have endianness markup
249 [27042] libc: [alpha] anonymous union in struct stat confuses
251 [27053] libc: Conformance regression in system(3) (and probably also
253 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
255 [27077] network: Do not reload /etc/nsswitch.conf from chroot
256 [27083] libc: Unsafe unbounded alloca in addmntent
257 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
259 [27130] string: "rep movsb" performance issue
260 [27150] libc: alpha: wait4() is unavailable in static linking
261 [27177] dynamic-link:
262 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
264 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
265 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
266 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
267 related to combining characters (CVE-2021-3326)
274 * Unicode 13.0.0 Support: Character encoding, character type info, and
275 transliteration tables are all updated to Unicode 13.0.0, using
276 generator scripts contributed by Mike FABIAN (Red Hat).
278 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
280 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
281 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
282 Three ABIs are supported:
288 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
289 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
291 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
292 DT_DEPAUDIT dynamic section entries of the main executable.
294 * powerpc64le supports IEEE128 long double libm/libc redirects when
295 using -mabi=ieeelongdouble to compile C code on supported GCC
296 toolchains. It is recommended to use GCC 8 or newer when testing
299 * To help detect buffer overflows and other out-of-bounds accesses
300 several APIs have been annotated with GCC 'access' attribute. This
301 should help GCC 10 issue better warnings.
303 * On Linux, functions pthread_attr_setsigmask_np and
304 pthread_attr_getsigmask_np have been added. They allow applications
305 to specify the signal mask of a thread created with pthread_create.
307 * The GNU C Library now provides the header file <sys/single_threaded.h>
308 which declares the variable __libc_single_threaded. Applications are
309 encouraged to use this variable for single-thread optimizations,
310 instead of weak references to symbols historically defined in
313 * The functions sigabbrev_np and sigdescr_np have been added. The
314 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
315 SIGHUP) while sigdescr_np returns a string describing the signal number
316 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
317 attempt to translate the return description, both functions return
318 NULL for an invalid signal number.
320 They should be used instead of sys_siglist or sys_sigabbrev and they
321 are both thread and async-signal safe. These functions are GNU extensions.
323 * The functions strerrorname_np and strerrordesc_np have been added. The
324 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
325 while strerrordesc_np returns a string describing the error number
326 (e.g "Invalid argument" for EINVAL). Different than strerror,
327 strerrordesc_np does not attempt to translate the return description, both
328 functions return NULL for an invalid error number.
330 They should be used instead of sys_errlist and sys_nerr, both are
331 thread and async-signal safe. These functions are GNU extensions.
333 * AArch64 now supports standard branch protection security hardening
334 in glibc when it is built with a GCC that is configured with
335 --enable-standard-branch-protection (or if -mbranch-protection=standard
336 flag is passed when building both GCC target libraries and glibc,
337 in either case a custom GCC is needed). This includes branch target
338 identification (BTI) and pointer authentication for return addresses
339 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
340 extensions respectively for the protection to be effective,
341 otherwise the used instructions are nops. User code can use PAC-RET
342 without libc support, but BTI requires a libc that is built with BTI
343 support, otherwise runtime objects linked into user code will not be
346 Deprecated and removed features, and other changes affecting compatibility:
348 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
349 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
350 RPC header files. Backward compatibility for old programs is kept
351 only for architectures and ABIs that have been added in or before
352 glibc 2.31. New programs need to use TI-RPC
353 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
354 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
356 * Remove configure option --enable-obsolete-nsl. libnsl is only built
357 as shared library for backward compatibility and the NSS modules "nis"
358 and "nisplus" are not built at all and libnsl's headers aren't
359 installed. This compatibility is kept only for architectures and ABIs
360 that have been added in or before version 2.28. Replacement
361 implementations based on TI-RPC, which additionally support IPv6, are
362 available from <https://github.com/thkukuk/>. This change does not
363 affect the "compat" NSS module, which does not depend on libnsl
364 since 2.27 and thus can be used without NIS.
366 * The deprecated <sys/sysctl.h> header and the sysctl function have been
367 removed. To support old binaries, the sysctl function continues to
368 exist as a compatibility symbol (on those architectures which had it),
369 but always fails with ENOSYS. This reflects the removal of the system
370 call from all architectures, starting with Linux 5.5.
372 * The sstk function is no longer available to newly linked binaries.
373 Its implementation always returned with a failure, and the function
374 was not declared in any header file.
376 * The legacy signal handling functions siginterrupt, sigpause, sighold,
377 sigrelse, sigignore and sigset, and the sigmask macro have been
378 deprecated. Applications should use the sigsuspend, sigprocmask and
379 sigaction functions instead.
381 * ldconfig now defaults to the new format for ld.so.cache. glibc has
382 already supported this format for almost 20 years.
384 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
385 are no longer available to newly linked binaries, and their declarations
386 have been removed from <string.h>. They are exported solely as
387 compatibility symbols to support old binaries. All programs should use
390 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
391 are no longer available to newly linked binaries, and their declarations
392 have been removed from <stdio.h>. They are exported solely as
393 compatibility symbols to support old binaries. All programs should use
394 strerror or strerror_r instead.
396 * Both strerror and strerror_l now share the same internal buffer in the
397 calling thread, meaning that the returned string pointer may be invalided
398 or contents might be overwritten on subsequent calls in the same thread or
399 if the thread is terminated. It makes strerror MT-safe.
401 * Using weak references to libpthread functions such as pthread_create
402 or pthread_key_create to detect the singled-threaded nature of a
403 program is an obsolescent feature. Future versions of glibc will
404 define pthread_create within libc.so.6 itself, so such checks will
405 always flag the program as multi-threaded. Applications should check
406 the __libc_single_threaded variable declared in
407 <sys/single_threaded.h> instead.
409 * The "files" NSS module no longer supports the "key" database (used for
410 secure RPC). The contents of the /etc/publickey file will be ignored,
411 regardless of the settings in /etc/nsswitch.conf. (This method of
412 storing RPC keys only supported the obsolete and insecure AUTH_DES
413 flavor of secure RPC.)
415 * The __morecore and __after_morecore_hook malloc hooks and the default
416 implementation __default_morecore have been deprecated. Applications
417 should use malloc interposition to change malloc behavior, and mmap to
418 allocate anonymous memory. A future version of glibc may require that
419 applications which use the malloc hooks must preload a special shared
420 object, to enable the hooks.
422 * The hesiod NSS module has been deprecated and will be removed in a
423 future version of glibc. System administrators are encouraged to
424 switch to other approaches for networked account databases, such as
427 Changes to build and runtime requirements:
429 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
430 long double redirects.
432 Security related changes:
434 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
435 invoked with the -c option and when processing invalid multi-byte input
436 sequences. Reported by Jan Engelhardt.
438 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
439 corruption when they were passed a pseudo-zero argument. Reported by Guido
440 Vranken / ForAllSecure Mayhem.
442 CVE-2020-1752: A use-after-free vulnerability in the glob function when
443 expanding ~user has been fixed.
445 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
446 memmove functions has been fixed. Discovered by Jason Royes and Samual
447 Dytrych of the Cisco Security Assessment and Penetration Team (See
450 The following bugs are resolved with this release:
452 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
453 [10441] manual: Backtraces code example lacks error checking
454 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
455 timer_sigev_thread dangerous
456 [14231] stdio: stdio-common tests memory requirements
457 [14578] libc: /proc-based emulation for lchmod, fchmodat
458 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
459 filtee has constructor
460 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
461 sequences (CVE-2016-10228)
462 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
463 character entities for infinity & pi
464 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
465 segfaults in applications
466 [20543] libc: Please move from .gnu.linkonce to comdat
467 [22489] network: gcc warns about implicit convertion in
468 ICMP6_FILTER_SETPASS with -Wsign-conversion
469 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
470 [23294] math: Complex _FloatN functions are redirected to the wrong
471 function with -mlong-double-64
472 [23296] libc: Data race in setting function descriptor during lazy
474 [23668] dynamic-link: ldconfig: Default to the new format for
476 [23819] hurd: hurd: Add C11 thread support
477 [23990] build: test-container error out on failure to exec child.
478 [23991] build: shell-container typo in run_command_array
479 [24638] manual: Error in example of parsing a template string
480 [24654] manual: Wrong declaration of wcschr in libc manual
481 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
483 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
484 dynamically loaded dsos
485 [25098] nptl: nptl: ctype classification functions are not AS-Safe
486 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
488 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
489 restore EAX, ECX and EDX
490 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
491 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
492 [25420] network: Race condition in resolv_conf.c can result in caching
493 stale configuration forever
494 [25487] math: sinl() stack corruption from crafted input
496 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
498 [25523] libc: MIPS/Linux inline syscall template is miscompiled
499 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
501 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
502 on 32 bit and old kernel
503 [25635] libc: arm: Wrong sysdep order selection for soft-fp
504 [25639] localedata: Some names of days and months wrongly spelt in
506 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
507 amount of sigset_t bytes
508 [25691] stdio: printf: memory leak when printing long multibyte
510 [25715] libc: system() returns wrong errors when posix_spawn fails
511 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
512 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
513 state for conversions that produce two Unicode code points
514 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
515 for linux x86_64 leads to livelock
516 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
517 test failures, invalid instruction in ld.so
518 [25790] glob: Typo in tst-fnmatch.input
519 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
521 [25819] localedata: Update locale data to Unicode 13.0.0
522 [25824] libc: Abnormal function of strnlen in aarch64
523 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
524 [25896] libc: Incorrect prctl
525 [25902] libc: Bad LOADARGS_N
526 [25905] dynamic-link: VSX registers are corrupted during PLT
527 resolution when glibc is built with --disable-multi-arch and --with-
529 [25933] string: Off by one error in __strncmp_avx2 when
530 length=VEC_SIZE*4 and strings are at page boundaries can cause a
532 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
533 exiting detached thread
534 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
536 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
538 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
539 [26073] math: getpayload() has wrong return value
540 [26076] dynamic-link: dlmopen crashes after failing to load
541 dependencies in audit mode
542 [26120] localedata: column width of of some Korean
543 JUNGSEONG/JONGSEONG characters wrong (should be 0)
544 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
545 [26133] libc: Incorrect need_arch_feature_F16C
546 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
548 [26149] libc: PKU is usable only if OSPKE is set
549 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
551 [26208] libc: Incorrect bit_cpu_CLFSH
552 [26210] network: Incorrect use of hidden symbols for global sunrpc
554 [26211] stdio: printf integer overflow calculating allocation size
555 [26214] stdio: printf_fp double free
556 [26215] stdio: printf_fp memory leak
557 [26232] time: FAIL: support/tst-timespec for 32-bit targets
558 [26258] nss: nss_compat should not read input files with mmap
559 [26332] string: Incorrect cache line size load causes memory
567 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
568 enable features from the draft ISO C2X standard. Only some features from
569 this draft standard are supported by the GNU C Library, and as the draft
570 is under active development, the set of features enabled by this macro is
571 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
572 by compiling with "gcc -std=gnu2x".
574 * The <math.h> functions that round their results to a narrower type now
575 have corresponding type-generic macros in <tgmath.h>, as defined in TS
576 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
577 Clarification Request 13 to TS 18661-3.
579 * The function pthread_clockjoin_np has been added, enabling join with a
580 terminated thread with a specific clock. It allows waiting against
581 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
583 * New locale added: mnw_MM (Mon language spoken in Myanmar).
585 * The DNS stub resolver will optionally send the AD (authenticated data) bit
586 in queries if the trust-ad option is set via the options directive in
587 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
588 mode, the AD bit, as provided by the name server, is available to
589 applications which call res_search and related functions. In the default
590 mode, the AD bit is not set in queries, and it is automatically cleared in
591 responses, indicating a lack of DNSSEC validation. (Therefore, the name
592 servers and the network path to them are treated as untrusted.)
594 Deprecated and removed features, and other changes affecting compatibility:
596 * The totalorder and totalordermag functions, and the corresponding
597 functions for other floating-point types, now take pointer arguments to
598 avoid signaling NaNs possibly being converted to quiet NaNs in argument
599 passing. This is in accordance with the resolution of Clarification
600 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
601 floating-point arguments directly will continue to work.
603 * The obsolete function stime is no longer available to newly linked
604 binaries, and its declaration has been removed from <time.h>.
605 Programs that set the system time should use clock_settime instead.
607 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
608 in a future version of glibc. In this release, the header still exists
609 but calling ftime will cause a compiler warning. All programs should use
610 gettimeofday or clock_gettime instead.
612 * The gettimeofday function no longer reports information about a
613 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
614 many years, as it cannot handle the full complexity of the world's
615 timezones, but hitherto we have supported it on a best-effort basis.
616 Changes required to support 64-bit time_t on 32-bit architectures have
617 made this no longer practical.
619 As of this release, callers of gettimeofday with a non-null 'tzp' argument
620 should expect to receive a 'struct timezone' whose tz_minuteswest and
621 tz_dsttime fields are zero. (For efficiency reasons, this does not always
622 happen on a few Linux-based ports. This will be corrected in a future
625 All callers should supply a null pointer for the 'tzp' argument to
626 gettimeofday. For accurate information about the time zone associated
627 with the current time, use the localtime function.
629 gettimeofday itself is obsolescent according to POSIX. We have no plans
630 to remove access to this function, but portable programs should consider
631 using clock_gettime instead.
633 * The settimeofday function can still be used to set a system-wide time
634 zone when the operating system supports it. This is because the Linux
635 kernel reused the API, on some architectures, to describe a system-wide
636 time-zone-like offset between the software clock maintained by the kernel,
637 and the "RTC" clock that keeps time when the system is shut down.
639 However, to reduce the odds of this offset being set by accident,
640 settimeofday can no longer be used to set the time and the offset
641 simultaneously. If both of its two arguments are non-null, the call
642 will fail (setting errno to EINVAL).
644 Callers attempting to set this offset should also be prepared for the call
645 to fail and set errno to ENOSYS; this already happens on the Hurd and on
646 some Linux architectures. The Linux kernel maintainers are discussing a
647 more principled replacement for the reused API. After a replacement
648 becomes available, we will change settimeofday to fail with ENOSYS on all
649 platforms when its 'tzp' argument is not a null pointer.
651 settimeofday itself is obsolescent according to POSIX. Programs that set
652 the system time should use clock_settime and/or the adjtime family of
653 functions instead. We may cease to make settimeofday available to newly
654 linked binaries after there is a replacement for Linux's time-zone-like
657 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
658 the optional CAS instruction is implemented (for instance, LEON processors
659 are still supported, but SuperSPARC processors are not).
661 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
664 * If a lazy binding failure happens during dlopen, during the execution of
665 an ELF constructor, the process is now terminated. Previously, the
666 dynamic loader would return NULL from dlopen, with the lazy binding error
667 captured in a dlerror message. In general, this is unsafe because
668 resetting the stack in an arbitrary function call is not possible.
670 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
671 executable stack unless explicitly configured at build time to require
672 minimum kernel version 4.8 or newer. This is because executing
673 floating-point branches on a non-executable stack on Linux kernels prior to
674 4.8 can lead to application crashes for some MIPS configurations. While
675 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
676 expected to enable non-executable stack by default with PT_GNU_STACK by
677 default and is thus likely to trigger a crash on older kernels.
679 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
680 non-executable stack while dropping support for older kernels.
682 * System call wrappers for time system calls now use the new time64 system
683 calls when available. On 32-bit targets, these wrappers attempt to call
684 the new system calls first and fall back to the older 32-bit time system
685 calls if they are not present. This may cause issues in environments
686 that cannot handle unsupported system calls gracefully by returning
687 -ENOSYS. Seccomp sandboxes are affected by this issue.
689 Changes to build and runtime requirements:
691 * It is no longer necessary to have recent Linux kernel headers to build
692 working (non-stub) system call wrappers on all architectures except 64-bit
693 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
695 * The ChangeLog file is no longer present in the toplevel directory of the
696 source tree. ChangeLog files are located in the ChangeLog.old directory as
697 ChangeLog.N where the highest N has the latest entries.
699 Security related changes:
701 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
702 out-of-bounds write when executed in a signal frame context.
704 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
705 environment variable during program execution after a security
706 transition, allowing local attackers to restrict the possible mapping
707 addresses for loaded libraries and thus bypass ASLR for a setuid
708 program. Reported by Marcin Kościelnicki.
710 The following bugs are resolved with this release:
712 [12031] localedata: iconv -t ascii//translit with Greek characters
713 [15813] libc: Multiple issues in __gen_tempname
714 [17726] libc: [arm, sparc] profil_counter should be compat symbol
715 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
716 [19767] libc: vdso is not used with static linking
717 [19903] hurd: Shared mappings not being inherited by children processes
718 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
719 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
721 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
722 Symbols-A/B Unicode blocks
723 [23518] libc: Eliminate __libc_utmp_jump_table
724 [24026] malloc: malloc_info() returns wrong numbers
725 [24054] localedata: Many locales are missing date_fmt
726 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
727 [24304] dynamic-link: Lazy binding failure during ELF
728 constructors/destructors is not fatal
729 [24376] libc: RISC-V symbol size confusion with _start
730 [24682] localedata: zh_CN first weekday should be Monday per GB/T
732 [24824] libc: test-in-container does not install charmap files compatible
734 [24844] regex: regex bad pointer / leakage if malloc fails
735 [24867] malloc: Unintended malloc_info formatting changes
736 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
737 [24880] libc: login: utmp implementation uses struct flock with fcntl64
738 [24882] libc: login: pututline uses potentially outdated cache
739 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
740 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
742 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
744 [24930] dynamic-link: dlopen of PIE executable can result in
745 _dl_allocate_tls_init assertion failure
746 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
747 (stringop-overflow error)
748 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
749 functions other can lead to crashes
750 [24967] libc: jemalloc static linking causes runtime failure
751 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
753 [25035] libc: sbrk() failure handled poorly in tunables_strdup
754 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
755 [25097] libc: new -Warray-bounds with GCC 10
756 [25112] dynamic-link: dlopen must not make new objects accessible when it
757 still can fail with an error
758 [25139] localedata: Please add the new mnw_MM locale
759 [25149] regex: Array bounds violation in proceed_next_node
760 [25157] dynamic-link: Audit cookie for the dynamic loader is not
761 initialized correctly
762 [25189] libc: glibc's __glibc_has_include causes issues with clang
764 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
766 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
767 binaries (CVE-2019-19126)
768 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
770 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
772 [25232] string: <string.h> does not enable const correctness for strchr et
774 [25233] localedata: Consider "." as the thousands separator for sl_SI
776 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
777 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
778 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
780 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
781 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
783 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
784 (dl_initfirst) link map pointer
785 [25401] malloc: pvalloc must not have __attribute_alloc_size__
786 [25423] libc: Array overflow in backtrace on powerpc
787 [25425] network: Missing call to __resolv_context_put in
788 getaddrinfo.c:gethosts
795 * Unicode 12.1.0 Support: Character encoding, character type info, and
796 transliteration tables are all updated to Unicode 12.1.0, using
797 generator scripts contributed by Mike FABIAN (Red Hat).
799 * The dynamic linker accepts the --preload argument to preload shared
800 objects, in addition to the LD_PRELOAD environment variable.
802 * The twalk_r function has been added. It is similar to the existing
803 twalk function, but it passes an additional caller-supplied argument
804 to the callback function.
806 * On Linux, the getdents64, gettid, and tgkill functions have been added.
808 * Minguo (Republic of China) calendar support has been added as an
809 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
812 * The entry for the new Japanese era has been added for ja_JP locale.
814 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
815 pvalloc, memalign, and posix_memalign fail now with total object size
816 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
817 pointer subtraction within the allocated object, where results might
818 overflow the ptrdiff_t type.
820 * The dynamic linker no longer refuses to load objects which reference
821 versioned symbols whose implementation has moved to a different soname
822 since the object has been linked. The old error message, symbol
823 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
824 link time reference, is gone.
826 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
827 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
828 functions. These behave similarly to their "timed" equivalents, but also
829 accept a clockid_t parameter to determine which clock their timeout should
830 be measured against. All functions allow waiting against CLOCK_MONOTONIC
831 and CLOCK_REALTIME. The decision of which clock to be used is made at the
832 time of the wait (unlike with pthread_condattr_setclock, which requires
833 the clock choice at initialization time).
835 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
836 work, new resolvers can use a second argument which can be extended in
837 the future, currently it contains the AT_HWCAP2 value.
839 Deprecated and removed features, and other changes affecting compatibility:
841 * The copy_file_range function fails with ENOSYS if the kernel does not
842 support the system call of the same name. Previously, user space
843 emulation was performed, but its behavior did not match the kernel
844 behavior, which was deemed too confusing. Applications which use the
845 copy_file_range function can no longer rely on glibc to provide a fallback
846 on kernels that do not support the copy_file_range system call, and if
847 this function returns ENOSYS, they will need to use their own fallback.
848 Support for copy_file_range for most architectures was added in version
849 4.5 of the mainline Linux kernel.
851 * The functions clock_gettime, clock_getres, clock_settime,
852 clock_getcpuclockid, clock_nanosleep were removed from the librt library
853 for new applications (on architectures which had them). Instead, the
854 definitions in libc will be used automatically, which have been available
857 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
858 and <sys/stropts.h> have been removed.
860 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
861 resolver flag (deprecated in glibc 2.25) have been removed.
863 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
864 resolver have been removed from <resolv.h>.
866 * With --enable-bind-now, installed programs are now linked with the
869 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
870 configurations) has been removed, following the deprecation of this
871 subarchitecture in version 8 of GCC, and its removal in version 9.
873 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
874 header have been removed.
876 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
877 deprecated and will be removed from a future version of glibc.
878 Application should directly access /proc instead. For obtaining random
879 bits, the getentropy function can be used.
881 Changes to build and runtime requirements:
883 * GCC 6.2 or later is required to build the GNU C Library.
885 Older GCC versions and non-GNU compilers are still supported when
886 compiling programs that use the GNU C Library.
888 Security related changes:
890 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
891 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
892 has undefined behavior. On x32, the size_t argument may be passed
893 in the lower 32 bits of the 64-bit RDX register with non-zero upper
894 32 bits. When it happened with the sign bit of RDX register set,
895 memcmp gave the wrong result since it treated the size argument as
896 zero. Reported by H.J. Lu.
898 CVE-2019-9169: Attempted case-insensitive regular-expression match
899 via proceed_next_node in posix/regexec.c leads to heap-based buffer
900 over-read. Reported by Hongxu Chen.
902 The following bugs are resolved with this release:
904 [2872] locale: Transliteration Cyrillic -> ASCII fails
905 [6399] libc: gettid() should have a wrapper
906 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
907 [16976] glob: fnmatch unbounded stack VLA for collating symbols
908 [17396] localedata: globbing for locale by [[.collating-element.]]
909 [18035] dynamic-link: pldd does no longer work, enters infinite loop
910 [18465] malloc: memusagestat is built using system C library
911 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
912 invalid input drops valid char
913 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
914 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
915 [21897] localedata: Afar locales: Fix mon, abmon, and abday
916 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
917 [23352] malloc: __malloc_check_init still defined in public header
919 [23403] nptl: Wrong alignment of TLS variables
920 [23501] libc: nftw() doesn't return dangling symlink's inode
921 [23733] malloc: Check the count before calling tcache_get()
922 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
924 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
925 [23844] nptl: pthread_rwlock_trywrlock results in hang
926 [23983] argparse: Missing compat versions of argp_failure and argp_error
927 for long double = double
928 [23984] libc: Missing compat versions of err.h and error.h functions for
930 [23996] localedata: Dutch salutations
931 [24040] libc: riscv64: unterminated call chain in __thread_start
932 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
934 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
935 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
937 [24114] regex: regexec buffer read overrun in "grep -i
938 '\(\(\)*.\)*\(\)\(\)\1'"
939 [24122] libc: Segfaults if 0 returned from la_version
940 [24153] stdio: Some input functions do not react to stdin assignment
941 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
942 RDX is set) (CVE-2019-7309)
943 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
944 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
945 not the default "nor"
946 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
947 false positives, change to modern flexible array
948 [24180] nptl: pthread_mutex_trylock does not use the correct order of
949 instructions while maintaining the robust mutex list due to missing
951 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
952 unnecessary librt dependencies
953 [24200] localedata: Revert first_weekday removal in en_IE locale
954 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
955 [24215] nptl: pthread_timedjoin_np should be a cancellation point
956 [24216] malloc: Check for large bin list corruption when inserting
958 [24228] stdio: old x86 applications that use legacy libio crash on exit
959 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
961 [24293] localedata: Missing Minguo calendar support for TW locales
962 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
964 [24307] localedata: Update locale data to Unicode 12.0.0
965 [24323] dynamic-link: dlopen should not be able open PIE objects
966 [24335] build: "Obsolete types detected" with Linux 5.0 headers
967 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
969 [24370] localedata: Add lang_name for tt_RU locale
970 [24372] locale: Binary locale files are not architecture independent
971 [24394] time: strptime %Ey mis-parses final year of era
972 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
974 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
976 [24531] malloc: Malloc tunables give tcache assertion failures
977 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
979 [24535] localedata: Update locale data to Unicode 12.1.0
980 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
981 kernels and break testing
982 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
983 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
984 [-Werror=format-overflow=]
985 [24570] libc: alpha: compat msgctl uses __IPC_64
986 [24584] locale: Data race in __wcsmbs_clone_conv
987 [24588] stdio: Remove codecvt vtables from libio
988 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
990 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
991 [24632] stdio: Old binaries which use freopen with default stdio handles
993 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
995 [24652] localedata: szl_PL spelling correction
996 [24695] nss: nss_db: calling getpwent after endpwent crashes
997 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
998 in /etc/nsswitch.conf
999 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1000 [24740] libc: getdents64 type confusion
1001 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1002 always implemented in the same library
1003 [24744] libc: Remove copy_file_range emulation
1004 [24757] malloc: memusagestat is linked against system libpthread
1005 [24794] libc: Partial test suite run builds corrupt test-in-container
1013 * The getcpu wrapper function has been added, which returns the currently
1014 used CPU and NUMA node. This function is Linux-specific.
1016 * A new convenience target has been added for distribution maintainers
1017 to build and install all locales as directories with files. The new
1018 target is run by issuing the following command in your build tree:
1019 'make localedata/install-locale-files', with an optional DESTDIR
1020 to set the install root if you wish to install into a non-default
1021 configured location.
1023 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1025 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1026 for _GNU_SOURCE, to match BSD environments.
1028 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1029 indicates that it will abort the transaction prior to entering the kernel
1030 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1031 suspended, and this caused some undefined side-effects issues by aborting
1032 transactions manually. Glibc avoided it by abort transactions manually on
1033 each syscall, but it lead to performance issues on newer kernels where the
1034 HTM state is saved and restore lazily (the state being saved even when the
1035 process actually does not use HTM).
1037 * The functions posix_spawn_file_actions_addchdir_np and
1038 posix_spawn_file_actions_addfchdir_np have been added, enabling
1039 posix_spawn and posix_spawnp to run the new process in a different
1040 directory. These functions are GNU extensions. The function
1041 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1044 * The popen and system do not run atfork handlers anymore (BZ#17490).
1045 Although it is a possible POSIX violation, the POSIX rationale in
1046 pthread_atfork documentation regarding atfork handlers is to handle
1047 inconsistent mutex state after a fork call in a multi-threaded process.
1048 In both popen and system there is no direct access to user-defined mutexes.
1050 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1051 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1053 - C-SKY ABIV2 soft-float little-endian
1054 - C-SKY ABIV2 hard-float little-endian
1056 * strftime's default formatting of a locale's alternative year (%Ey)
1057 has been changed to zero-pad the year to a minimum of two digits,
1058 like "%y". This improves the display of Japanese era years during
1059 the first nine years of a new era, and is expected to be harmless
1060 for all other locales (only Japanese locales regularly have
1061 alternative year numbers less than 10). Zero-padding can be
1062 overridden with the '_' or '-' flags (which are GNU extensions).
1064 * As a GNU extension, the '_' and '-' flags can now be applied to
1065 "%EY" to control how the year number is formatted; they have the
1066 same effect that they would on "%Ey".
1068 Deprecated and removed features, and other changes affecting compatibility:
1070 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1071 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1073 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1074 in <sys/procfs.h>, has been corrected to match the type actually used by
1075 the Linux kernel. This affects the size and layout of that structure on
1076 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1078 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1079 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1080 defined in <sys/procfs.h>, has been corrected to match the type actually
1081 used by the Linux kernel. This affects the size and layout of those
1084 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1085 meant to scan a string and allocate space for it with malloc, is now
1086 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1087 defined. This extension conflicts with C99's use of '%a' to scan a
1088 hexadecimal floating-point number, which is now available to programs
1089 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1091 POSIX.1-2008 includes the feature of allocating a buffer for string input
1092 with malloc, using the modifier letter 'm' instead. Programs using
1093 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1094 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1095 C99 '%a' no longer need to avoid _GNU_SOURCE.
1097 GCC's -Wformat warnings can detect most uses of this extension, as long
1098 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1099 __attribute__ ((format (scanf, ...))).
1101 Changes to build and runtime requirements:
1103 * Python 3.4 or later is required to build the GNU C Library.
1105 * On most architectures, GCC 5 or later is required to build the GNU C
1106 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1108 Older GCC versions and non-GNU compilers are still supported when
1109 compiling programs that use the GNU C Library.
1111 Security related changes:
1113 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1114 denial of service due to resource exhaustion when processing getaddrinfo
1115 calls with crafted host names. Reported by Guido Vranken.
1117 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1118 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1119 happened, accessing the 32-bit size_t value as the full 64-bit register
1120 in the assembly string/memory functions would cause a buffer overflow.
1121 Reported by H.J. Lu.
1123 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1124 addresses with arbitrary trailing characters, potentially leading to data
1125 or command injection issues in applications.
1127 The following bugs are resolved with this release:
1129 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1130 [10496] localedata: 12h time representation in multiple locales faulty
1131 [10797] localedata: it_IT locale numeric does not have a separator for
1133 [11319] libc: dprintf doesn't handle errors properly
1134 [16346] time: mktime: potentially unsafe use of localtime_offset
1135 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1137 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1138 posix_spawn_file_actions_addfchdir_np
1139 [17426] localedata: Indian locales: set the correct date format
1140 [17490] stdio: popen should not invoke atfork handlers
1141 [17783] libc: TIOCSER_TEMT conditions inconsistent
1142 [18040] regex: use-after-free in regexec/get_subexp
1143 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1144 [20018] network: getaddrinfo should reject IP addresses with trailing
1145 characters (CVE-2016-10739)
1146 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1147 [20271] libc: Missing "\n" in __libc_fatal calls
1148 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1149 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1150 pointer argument is non-NULL
1151 [21037] stdio: open_memstream and freopen
1152 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1153 [21716] time: Crash in glibc's mktime in low-memory situations
1154 [22834] stdio: Subprocess forked by popen may crash in Linux when
1155 multithreads call popen
1156 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1157 and pthread_create fails.
1158 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1159 [23125] libc: riscv64: endless loop when throwing an exception from a
1161 [23275] nptl: Race in pthread_mutex_lock while promoting to
1162 PTHREAD_MUTEX_ELISION_NP.
1163 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1165 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1167 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1169 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1170 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1172 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1173 [23521] nss: get_next_alias nss_files file stream leak
1174 [23538] nptl: Hang in pthread_cond_broadcast
1175 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1176 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1177 [23579] libc: Errors misreported in preadv2
1178 [23597] build: support/test-container.c doesn't work with different
1180 [23603] time: mktime signed integer overflow on large timestamps
1181 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1182 [23614] libc: powerpc: missing CFI register information in __mpn_*
1184 [23637] string: Generic strstr/strcasestr fails with huge needles
1185 [23640] libc: no way to easily clear FD_CLOEXEC in
1186 posix_spawn_file_actions_adddup2()
1187 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1189 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1191 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1192 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1193 bits/types/struct_rusage.h
1194 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1196 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1198 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1199 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1200 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1202 [23724] localedata: Albanian date formats are incorrect
1203 [23735] math: libnldbl_nonshared.a references internal libm symbols
1204 [23740] localedata: kl_GL: Month names and date formats need update
1205 [23744] regex: regex refactorings to remove BE, avoid duplication
1206 [23745] time: mktime fix for Gnulib + coreutils
1207 [23758] time: Improve the width of alternate representation for year in
1209 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1210 [23789] time: mktime does not set errno on failure
1211 [23791] localedata: Wrong monetary format for ca_ES locale
1212 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1213 [23794] locale: c16rtomb does not handle surrogate pairs
1214 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1215 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1216 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1217 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1218 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1219 [23862] libc: [sh] missing kernel-features.h undefines
1220 [23864] libc: [riscv] missing kernel-features.h undefines
1221 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1222 [23907] malloc: Incorrect double-free malloc tcache check disregards
1224 [23913] libc: off-by-one in function maybe_script_execute in
1225 sysdeps/posix/spawni.c
1226 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1227 [23923] locale: Add --no-hard-links option to localedef
1228 [23927] network: Linux if_nametoindex() does not close descriptor
1230 [23961] math: powf can overflow to inf without setting errno in non-
1231 nearest rounding mode
1232 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1233 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1234 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1235 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1236 [24011] localedata: Fixed small type in comment for locale bs_BA
1237 [24018] libc: gettext() may return NULL
1238 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1239 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1240 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1242 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1243 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1245 [24046] localedata: en_US locale doesn't define date_fmt
1246 [24063] manual: @var{errno} should be @code{errno}
1247 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1248 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1250 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1252 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1254 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1256 [24112] network: Do not send DNS queries for non-host names (where all
1257 answers will be rejected)
1258 [24130] libc: alpha __remqu corrupts $f3 register
1265 * The localization data for ISO 14651 is updated to match the 2016
1266 Edition 4 release of the standard, this matches data provided by
1267 Unicode 9.0.0. This update introduces significant improvements to the
1268 collation of Unicode characters. This release deviates slightly from
1269 the standard in that the collation element ordering for lowercase and
1270 uppercase LATIN script characters is adjusted to ensure that regular
1271 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1272 is not matched by [a-z]. With the update many locales have been
1273 updated to take advantage of the new collation information. The new
1274 collation information has increased the size of the compiled locale
1275 archive or binary locales.
1277 * The GNU C Library can now be compiled with support for Intel CET, AKA
1278 Intel Control-flow Enforcement Technology. When the library is built
1279 with --enable-cet, the resulting glibc is protected with indirect
1280 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1281 compatible with all existing executables and shared libraries. This
1282 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1283 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1284 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1285 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1286 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1287 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1290 * The GNU C Library now has correct support for ABSOLUTE symbols
1291 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1292 relocated incorrectly or in some cases discarded. The GNU linker can
1293 make use of the newer semantics, but it must communicate it to the
1294 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1295 field) to indicate such support is required.
1297 * Unicode 11.0.0 Support: Character encoding, character type info, and
1298 transliteration tables are all updated to Unicode 11.0.0, using
1299 generator scripts contributed by Mike FABIAN (Red Hat).
1301 * <math.h> functions that round their results to a narrower type are added
1302 from TS 18661-1:2014 and TS 18661-3:2015:
1304 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1305 fMxaddfNx functions.
1307 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1308 fMxsubfNx functions.
1310 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1311 fMxmulfNx functions.
1313 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1314 fMxdivfNx functions.
1316 * Two grammatical forms of month names are now supported for the following
1317 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1318 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1319 support two grammatical forms in abbreviated month names: Catalan, Greek,
1322 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1323 include the support for two grammatical forms of month names.
1325 * Building and running on GNU/Hurd systems now works without out-of-tree
1328 * The renameat2 function has been added, a variant of the renameat function
1329 which has a flags argument. If the flags are zero, the renameat2 function
1330 acts like renameat. If the flag is not zero and there is no kernel
1331 support for renameat2, the function will fail with an errno value of
1332 EINVAL. This is different from the existing gnulib function renameatu,
1333 which performs a plain rename operation in case of a RENAME_NOREPLACE
1334 flags and a non-existing destination (and therefore has a race condition
1335 that can clobber the destination inadvertently).
1337 * The statx function has been added, a variant of the fstatat64
1338 function with an additional flags argument. If there is no direct
1339 kernel support for statx, glibc provides basic stat support based on
1340 the fstatat64 function.
1342 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1343 library if installed. libidn2 version 2.0.5 or later is recommended. If
1344 libidn2 is not available, internationalized domain names are not encoded
1345 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1346 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1347 with an encoding error.) Flags which used to change the IDN encoding and
1348 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1349 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1350 deprecated. They no longer have any effect.
1352 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1353 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1354 range of ELF gABI expressions including such constructs as
1355 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1356 have been further restricted, and where in the past a dynamic string
1357 token sequence may have been interpreted as a literal string it will
1358 now cause a load failure. These load failures were always considered
1359 unspecified behaviour from the perspective of the dynamic loader, and
1360 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1361 results in a load failure now.
1363 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1364 implementation includes all the standard functions provided by
1367 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1368 thrd_detach, thrd_exit, and thrd_join for thread management.
1370 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1371 mtx_destroy for mutual exclusion.
1373 - call_once for function call synchronization.
1375 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1376 cnd_wait for conditional variables.
1378 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1380 Application developers must link against libpthread to use ISO C threads.
1382 Deprecated and removed features, and other changes affecting compatibility:
1384 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1385 installed. Software that was using either header should be updated to
1386 use standard <stdio.h> interfaces instead.
1388 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1389 This was never required by the C standard, and the macros just expanded
1390 to call alternative names for the same functions. If you hoped getc and
1391 putc would provide performance improvements over fgetc and fputc, instead
1392 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1393 necessary, flockfile and funlockfile.
1395 * All stdio functions now treat end-of-file as a sticky condition. If you
1396 read from a file until EOF, and then the file is enlarged by another
1397 process, you must call clearerr or another function with the same effect
1398 (e.g. fseek, rewind) before you can read the additional data. This
1399 corrects a longstanding C99 conformance bug. It is most likely to affect
1400 programs that use stdio to read interactive input from a terminal.
1403 * The macros 'major', 'minor', and 'makedev' are now only available from
1404 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1405 headers that happen to include <sys/types.h>. These macros are rarely
1406 used, not part of POSIX nor XSI, and their names frequently collide with
1407 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1408 further explanation.
1410 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1411 these macros should first include <sys/types.h>, and then include
1412 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1414 * The tilegx*-*-linux-gnu configurations are no longer supported.
1416 * The obsolete function ustat is no longer available to newly linked
1417 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1418 function has been deprecated in favor of fstatfs and statfs.
1420 * The obsolete function nfsservctl is no longer available to newly linked
1421 binaries. This function was specific to systems using the Linux kernel
1422 and could not usefully be used with the GNU C Library on systems with
1423 version 3.1 or later of the Linux kernel.
1425 * The obsolete function name llseek is no longer available to newly linked
1426 binaries. This function was specific to systems using the Linux kernel
1427 and was not declared in a header. Programs should use the lseek64 name
1428 for this function instead.
1430 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1431 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1432 previously selected by them is now always enabled.
1434 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1435 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1436 restriction (rejecting '_' in host names, among other things) has been
1437 removed, for increased compatibility with non-IDN name resolution.
1439 * The fcntl function now have a Long File Support variant named fcntl64. It
1440 is added to fix some Linux Open File Description (OFD) locks usage on non
1441 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1442 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1443 locks act as a cancellation entrypoint.
1445 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1446 ecb_crypt, and des_setparity are no longer available to newly linked
1447 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1448 longer installed. These functions encrypted and decrypted data with the
1449 DES block cipher, which is no longer considered secure. Software that
1450 still uses these functions should switch to a modern cryptography library,
1453 * Reflecting the removal of the encrypt and setkey functions above, the
1454 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1455 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1458 * The obsolete function fcrypt is no longer available to newly linked
1459 binaries. It was just another name for the standard function crypt,
1460 and it has not appeared in any header file in many years.
1462 * We have tentative plans to hand off maintenance of the passphrase-hashing
1463 library, libcrypt, to a separate development project that will, we hope,
1464 keep up better with new passphrase-hashing algorithms. We will continue
1465 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1466 'crypt_r' should not need to change at all; however, distributions will
1467 need to install <crypt.h> and libcrypt from a separate project.
1469 In this release, if the configure option --disable-crypt is used, glibc
1470 will not install <crypt.h> or libcrypt, making room for the separate
1471 project's versions of these files. The plan is to make this the default
1472 behavior in a future release.
1474 Changes to build and runtime requirements:
1476 GNU make 4.0 or later is now required to build glibc.
1478 Security related changes:
1480 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1481 been fixed by removing the glibc-internal IDNA implementation and using
1482 the system-provided libidn2 library instead. Originally reported by Hanno
1483 Böck and Christian Weisgerber.
1485 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1486 architecture could corrupt memory. Reported by Max Horn.
1488 CVE-2018-11236: Very long pathname arguments to realpath function could
1489 result in an integer overflow and buffer overflow. Reported by Alexey
1492 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1493 architecture could write beyond the target buffer, resulting in a buffer
1494 overflow. Reported by Andreas Schwab.
1496 The following bugs are resolved with this release:
1498 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1499 [6889] manual: 'PWD' mentioned but not specified
1500 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1501 when __WORDSIZE != 64
1502 [13762] regex: re_search etc. should return -2 on memory exhaustion
1503 [13888] build: /tmp usage during testing
1504 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1505 [14092] nptl: Support C11 threads
1506 [14095] localedata: Review / update collation data from Unicode / ISO
1508 [14508] libc: -Wformat warnings
1509 [14553] libc: Namespace pollution loff_t in sys/types.h
1510 [14890] libc: Make NT_PRFPREG canonical.
1511 [15105] libc: Extra PLT references with -Os
1512 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1514 [16335] manual: Feature test macro documentation incomplete and out of
1516 [16552] libc: Unify umount implementations in terms of umount2
1517 [17082] libc: htons et al.: statement-expressions prevent use on global
1518 scope with -O1 and higher
1519 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1520 [17438] localedata: pt_BR: wrong d_fmt delimiter
1521 [17662] libc: please implement binding for the new renameat2 syscall
1522 [17721] libc: __restrict defined as /* Ignore */ even in c11
1523 [17979] libc: inconsistency between uchar.h and stdint.h
1524 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1525 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1526 horrible machine code)
1527 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1529 [18471] libc: llseek should be a compat symbol
1530 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1532 [18991] nss: nss_files skips large entry in database
1533 [19239] libc: Including stdlib.h ends up with macros major and minor being
1535 [19463] libc: linknamespace failures when compiled with -Os
1536 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1537 [19527] locale: Normalized charset name not recognized by setlocale
1538 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1539 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1541 [19728] network: out of bounds stack read in libidn function
1542 idna_to_ascii_4i (CVE-2016-6261)
1543 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1544 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1545 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1547 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1548 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1549 [20419] dynamic-link: files with large allocated notes crash in
1551 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1552 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1553 [20980] manual: CFLAGS environment variable replaces vital options
1554 [21163] regex: Assertion failure in pop_fail_stack when executing a
1555 malformed regexp (CVE-2015-8985)
1556 [21234] manual: use of CFLAGS makes glibc detect no optimization
1557 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1558 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1559 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1560 [21508] locale: intl/tst-gettext failure with latest msgfmt
1561 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1562 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1563 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1565 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1567 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1568 [22247] network: Integer overflow in the decode_digit function in
1569 puny_decode.c in libidn (CVE-2017-14062)
1570 [22342] nscd: NSCD not properly caching netgroup
1571 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1572 [22550] localedata: es_ES locale (and other es_* locales): collation
1573 should treat ñ as a primary different character, sync the collation
1574 for Spanish with CLDR
1575 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1576 by gcc configured with --enable-default-pie
1577 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1578 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1579 crossing 2GB threshold (CVE-2017-18269)
1580 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1582 [22735] time: Misleading typo in time.h source comment regarding
1584 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1585 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1586 `__assert_perror_fail ()' to `__assert_fail_base ()'
1587 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1589 [22786] libc: Stack buffer overflow in realpath() if input size is close
1590 to SSIZE_MAX (CVE-2018-11236)
1591 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1592 through an absolute DT_NEEDED path
1593 [22792] build: tcb-offsets.h dependency dropped
1594 [22797] libc: pkey_get() uses non-reserved name of argument
1595 [22807] libc: PTRACE_* constants missing for powerpc
1596 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1597 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1598 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1599 [22848] localedata: ca_ES: update date definitions from CLDR
1600 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1601 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1602 [22896] localedata: Update locale data for an_ES
1603 [22902] math: float128 test failures with GCC 8
1604 [22918] libc: multiple common of `__nss_shadow_database'
1605 [22919] libc: sparc32: backtrace yields infinite backtrace with
1607 [22926] libc: FTBFS on powerpcspe
1608 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1610 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1611 [22947] libc: FAIL: misc/tst-preadvwritev2
1612 [22963] localedata: cs_CZ: Add alternative month names
1613 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1614 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1615 [22998] dynamic-link: execstack tests are disabled when SELinux is
1617 [23005] network: Crash in __res_context_send after memory allocation
1619 [23007] math: strtod cannot handle -nan
1620 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1621 [23036] regex: regex equivalence class regression
1622 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1623 [23069] libc: sigaction broken on riscv64-linux-gnu
1624 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1625 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1626 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1627 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1628 and libc build with -Os)
1629 [23140] localedata: More languages need two forms of month names
1630 [23145] libc: _init/_fini aren't marked as hidden
1631 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1632 [23171] math: C++ iseqsig for long double converts arguments to double
1633 [23178] nscd: sudo will fail when it is run in concurrent with commands
1634 that changes /etc/passwd
1635 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1637 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1638 [23208] localedata: New locale - Lower Sorbian (dsb)
1639 [23233] regex: Memory leak in build_charclass_op function in file
1641 [23236] stdio: Harden function pointers in _IO_str_fields
1642 [23250] nptl: Offset of __private_ss differs from GCC
1643 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1644 -mtune=generic -mfpmath=sse
1645 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1647 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1648 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1650 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1651 [23277] math: nan function should not have const attribute
1652 [23279] math: scanf and strtod wrong for some hex floating-point
1653 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1655 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1656 [23303] build: undefined reference to symbol
1657 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1658 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1660 [23313] stdio: libio vtables validation and standard file object
1662 [23329] libc: The __libc_freeres infrastructure is not properly run across
1664 [23349] libc: Various glibc headers no longer compatible with
1666 [23351] malloc: Remove unused code related to heap dumps and malloc
1668 [23363] stdio: stdio-common/tst-printf.c has non-free license
1669 [23396] regex: Regex equivalence regression in single-byte locales
1670 [23422] localedata: oc_FR: More updates of locale data
1671 [23442] build: New warning with GCC 8
1672 [23448] libc: Out of bounds access in IBM-1390 converter
1673 [23456] libc: Wrong index_cpu_LZCNT
1674 [23458] build: tst-get-cpu-features-static isn't added to tests
1675 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1677 [23467] dynamic-link: x86/CET: A property note parser bug
1684 * The GNU C Library can now be compiled with support for building static
1685 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1686 executables are like static executables but can be loaded at any address
1687 and provide additional security hardening benefits at the cost of some
1688 memory and performance. When the library is built with --enable-static-pie
1689 the resulting libc.a is usable with GCC 8 and above to create static PIE
1690 executables using the GCC option '-static-pie'. This feature is currently
1691 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1692 aarch64 with binutils 2.30 or later.
1694 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1695 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1698 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1700 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1702 * In order to support faster and safer process termination the malloc API
1703 family of functions will no longer print a failure address and stack
1704 backtrace after detecting heap corruption. The goal is to minimize the
1705 amount of work done after corruption is detected and to avoid potential
1706 security issues in continued process execution. Reducing shutdown time
1707 leads to lower overall process restart latency, so there is benefit both
1708 from a security and performance perspective.
1710 * The abort function terminates the process immediately, without flushing
1711 stdio streams. Previous glibc versions used to flush streams, resulting
1712 in deadlocks and further data corruption. This change also affects
1713 process aborts as the result of assertion failures.
1715 * On platforms where long double has the IEEE binary128 format (aarch64,
1716 alpha, mips64, riscv, s390 and sparc), the math library now implements
1717 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1718 These are the same interfaces added in version 2.26 for some platforms where
1719 this format is supported but is not the format of long double.
1721 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1722 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1723 implements interfaces for that type, as defined by ISO/IEC TS
1724 18661-3:2015. These are corresponding interfaces to those supported for
1727 * The math library now implements interfaces for the _Float32, _Float64 and
1728 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1729 corresponding interfaces to those supported for _Float128.
1731 * glibc now implements the memfd_create and mlock2 functions on Linux.
1733 * Support for memory protection keys was added. The <sys/mman.h> header now
1734 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1737 * The copy_file_range function was added.
1739 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1741 * The ldconfig utility now processes `include' directives using the C/POSIX
1742 collation ordering. Previous glibc versions used locale-specific
1743 ordering, the change might break systems that relied on that.
1745 * Support for two grammatical forms of month names has been added.
1746 In a call to strftime, the "%B" and "%b" format specifiers will now
1747 produce the grammatical form required when the month is used as part
1748 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1749 required when the month is named by itself. For instance, in Greek
1750 and in many Slavic and Baltic languages, "%B" will produce the month
1751 in genitive case, and "%OB" will produce the month in nominative case.
1753 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1754 are all valid and will all accept any known form of month
1755 name---standalone or complete, abbreviated or full. In a call to
1756 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1757 the strings used by "%B" and "%b", respectively. New query
1758 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1759 used by "%OB" and "%Ob", respectively.
1761 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1762 define the strings for %OB and %Ob, respectively; these have the
1763 same syntax as "mon" and "abmon". These arrays are optional; if they
1764 are not provided then they have the same content as "mon" and "abmon",
1767 These features are provided for locales which define "alt_mon" and/or
1768 "ab_alt_mon" in their locale source data. This release includes such
1769 alternative month name data for the following languages: Belarusian,
1770 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1772 This feature is currently a GNU extension, but it is expected to
1773 be added to the next revision of POSIX, and it is also already
1774 available on some BSD-derived operating systems.
1776 This feature will cause existing statically compiled applications
1777 to fail to load locales and fall back to the builtin C/POSIX locales.
1778 See notes below for other changes affecting compatibility.
1780 * Support for the RISC-V ISA running on Linux has been added. This port
1781 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1782 for the following ISA and ABI pairs:
1788 Deprecated and removed features, and other changes affecting compatibility:
1790 * Statically compiled applications attempting to load locales compiled for the
1791 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1792 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1793 support for two grammatical forms of the month names, also extends the locale
1794 data binary format. Static applications needing locale support must be
1795 recompiled to match the runtime and data they are deployed with. In some
1796 distributions there is an upgrade window where dynamically linked applications
1797 may use a new library but the old locale data and also fall back to the
1798 builtin C/POSIX locales; restarting the application process is sufficient to
1801 * Support for statically linked applications which call dlopen is deprecated
1802 and will be removed in a future version of glibc. Applications which call
1803 dlopen need to be linked dynamically instead.
1805 * Support for old programs which use internal stdio data structures and
1806 functions is deprecated. This includes programs which use the C++ streams
1807 provided by libstdc++ in GCC 2.95. Programs which use the internal
1808 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1809 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1810 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1811 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1812 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1813 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1814 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1815 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1816 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1817 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1818 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1819 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1820 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1821 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1822 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1823 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1824 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1825 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1826 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1827 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1828 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1829 future version of glibc. Unlike other symbol removals, these old
1830 applications will not be supported using compatibility symbols.
1832 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1833 defined by <sys/ptrace.h>.
1835 * libm no longer supports SVID error handling (calling a user-provided
1836 matherr function on error) or the _LIB_VERSION variable to control error
1837 handling. (SVID error handling and the _LIB_VERSION variable still work
1838 for binaries linked against older versions of the GNU C Library.) The
1839 libieee.a library is no longer provided. math.h no longer defines struct
1840 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1841 TLOSS, PLOSS and HUGE.
1843 * The libm functions pow10, pow10f and pow10l are no longer supported for
1844 new programs. Programs should use the standard names exp10, exp10f and
1845 exp10l for these functions instead.
1847 * The mcontext_t type is no longer the same as struct sigcontext. On
1848 platforms where it was previously the same, this changes the C++ name
1849 mangling for interfaces involving this type.
1851 * The add-ons mechanism for building additional packages at the same time as
1852 glibc has been removed. The --enable-add-ons configure option is now
1855 * The --without-fp configure option is now ignored. Whether hardware
1856 floating-point instructions are used is now configured based on whether
1857 the compiler used at configure time (without any options implied by a
1858 --with-cpu= configure option) uses such instructions.
1860 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1861 the specified string can be parsed as a domain name.
1863 * In the malloc_info output, the <heap> element may contain another <aspace>
1864 element, "subheaps", which contains the number of sub-heaps.
1866 * The libresolv function p_secstodate is no longer supported for new
1869 * The tilepro-*-linux-gnu configuration is no longer supported.
1871 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1872 and will be removed in a future release. Software that is still using
1873 either header should be updated to use standard <stdio.h> interfaces
1876 libio.h was originally the header for a set of supported GNU extensions,
1877 but they have not been maintained as such in many years, they are now
1878 standing in the way of improvements to stdio, and we don't think there are
1879 any remaining external users. _G_config.h was never intended for public
1880 use, but predates the bits convention.
1882 Changes to build and runtime requirements:
1884 * bison version 2.7 or later is required to generate code in the 'intl'
1887 Security related changes:
1889 CVE-2009-5064: The ldd script would sometimes run the program under
1890 examination directly, without preventing code execution through the
1891 dynamic linker. (The glibc project disputes that this is a security
1892 vulnerability; only trusted binaries must be examined using the ldd
1895 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1896 suffered from a one-byte overflow during ~ operator processing (either
1897 on the stack or the heap, depending on the length of the user name).
1898 Reported by Tim Rühsen.
1900 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1901 would sometimes fail to free memory allocated during ~ operator
1902 processing, leading to a memory leak and, potentially, to a denial
1905 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1906 without GLOB_NOESCAPE, could write past the end of a buffer while
1907 unescaping user names. Reported by Tim Rühsen.
1909 CVE-2017-17426: The malloc function, when called with an object size near
1910 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1911 instead of NULL. This was a regression introduced with the new malloc
1912 thread cache in glibc 2.26. Reported by Iain Buclaw.
1914 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1915 to the allocation of too much memory. (This is not a security bug per se,
1916 it is mentioned here only because of the CVE assignment.) Reported by
1919 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1920 of the number of search path components. (This is not a security
1921 vulnerability per se because no trust boundary is crossed if the fix for
1922 CVE-2017-1000366 has been applied, but it is mentioned here only because
1923 of the CVE assignment.) Reported by Qualys.
1925 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1926 for AT_SECURE or SUID binaries could be used to load libraries from the
1929 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1930 succeeds without returning an absolute path due to unexpected behaviour
1931 of the Linux kernel getcwd syscall. Reported by halfdog.
1933 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1934 an object size near the value of SIZE_MAX, would return a pointer to a
1935 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1937 CVE-2018-6551: The malloc function, when called with an object size near
1938 the value of SIZE_MAX, would return a pointer to a buffer which is too
1939 small, instead of NULL.
1941 The following bugs are resolved with this release:
1943 [866] glob: glob should match dangling symlinks
1944 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1945 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1947 [5997] math: Very slow execution of sinf function
1948 [10580] localedata: hr_HR: updated locale
1949 [10871] locale: 'mon' array should contain both nominative and genitive
1951 [12349] localedata: eu_ES: incorrect thousands separator
1952 [13605] localedata: shn_MM: new Shan locale
1953 [13805] localedata: ru_RU: currency should use ',' as radix point
1954 [13953] localedata: km_KH: locale update
1955 [13994] localedata: mjw_IN: new locale
1956 [14121] build: make writes .mo files in po directory
1957 [14333] libc: Fix the race between atexit() and exit()
1958 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1959 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1961 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1962 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1963 width Latin characters
1964 [15332] localedata: es_CU: locale update
1965 [15436] stdio: Don't close or flush stdio streams on abort
1966 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1968 [16148] localedata: ca_ES: incorrect thousands separator
1969 [16750] dynamic-link: ldd should not try to execute the binaries
1971 [16777] localedata: pl_PL: incorrect thousands separator in locale
1972 [16905] localedata: hanzi: new collation
1973 [17563] localedata: cmn_TW: add hanzi collation
1974 [17750] localedata: wrong collation order of diacritics in most locales
1975 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1977 [17956] build: Build fails on missing definitions from header file
1978 nss/nss.h when Mozilla NSS is used for cryptography
1979 [18203] libc: realpath() does not handle unreachable paths correctly
1980 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1981 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1982 [18822] libc: Internal functions are called via PLT
1983 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1984 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1985 [19574] libc: glibc should support building static PIE binaries
1986 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1988 [19971] glob: glob: Do not skip entries with zero d_ino values
1989 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1990 [20008] localedata: km_KH: convert to translit_neutral
1991 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1992 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1993 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1994 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1995 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
1997 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1998 they're set, wrong errors returned by gaih_inet when lookup functions
2000 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2001 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2003 [20952] localedata: yuw_PG: new locale
2004 [21084] localedata: charmaps/IBM858: new codepage
2005 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2006 [21242] libc: assert gives pedantic warning in old gcc versions
2007 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2008 __regcall calling convention
2009 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2010 [21326] libc: C99 functions are not declared for C++11 and later if
2011 _GNU_SOURCE is not predefined by g++
2012 [21457] libc: sys/ucontext.h namespace
2013 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2014 [21660] math: GCC fails to compile a formula with tgmath.h
2015 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2016 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2017 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2018 [21684] math: tgmath.h handling of complex integers
2019 [21685] math: tgmath.h handling of bit-fields
2020 [21686] math: tgmath.h handling of __int128
2021 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2023 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2025 [21750] localedata: column width of characters incompatible with classical
2027 [21754] malloc: malloc: Perform as little work as possible after heap
2028 consistency check failures
2029 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2030 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2031 [21791] string: Unused XXX_chk_XXX functions in libc.a
2032 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2034 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2036 [21845] localedata: Added new Locale bho_NP
2037 [21853] localedata: Fix abday Which looks same as day in zh_SG
2038 [21854] localedata: Added New Locale en_SC
2039 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2040 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2041 _dl_runtime_resolve_avx_slow
2042 [21885] network: getaddrinfo: gethosts does not release resolver context
2043 on memory allocation failure
2044 [21899] libc: XPG4.2 sigaction namespace
2045 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2047 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2049 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2050 errno value, causing getaddrinfo to fail
2051 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2052 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2053 instead of EAI_NODATA
2054 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2055 constant PTRACE_SEIZE_DEVEL
2056 [21930] math: C-only gcc builtins used in <math.h> isinf
2057 [21932] network: Unpaired __resolv_context_get in generic get*_r
2059 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2060 [21944] libc: sigval namespace
2061 [21951] localedata: Update hanzi collation by stroke
2062 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2063 sysdeps/x86_64/fpu/e_expf.S
2064 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2065 allocation in syscall loops)
2066 [21959] localedata: Fix Country name for xh_ZA
2067 [21960] localedata: Fix abmon for bem_ZM
2068 [21966] math: AVX2 mathvec functions use FMA without checking
2069 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2070 [21971] localedata: Added New Locale for mfe_MU
2071 [21972] libc: assert macro requires operator== (int) for its argument type
2072 [21973] math: [sparc] libm missing sqrtl compat symbol
2073 [21974] libc: Remove __bb_init_func and __bb_exit_func
2074 [21982] string: stratcliff.c: error: assuming signed overflow does not
2076 [21986] stdio: __guess_grouping is called incorrectly
2077 [21987] math: [sparc32] wrong bits/long-double.h installed
2078 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2080 [22022] localedata: Missing country_name for mni_IN
2081 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2083 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2085 [22026] locale: iconv_open: heap overflow on gconv_init failure
2086 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2087 [22035] math: [m68k] bits/math-inline.h macro namespace
2088 [22038] localedata: Fix abbreviated weeks and months for Somali
2089 [22044] localedata: Remove redundant data for Limburgish Language
2090 [22050] malloc: Linking with -lmcheck does not hook
2091 __malloc_initialize_hook correctly
2092 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2093 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2094 [22070] localedata: charmaps/UTF-8: wcwidth for
2095 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2096 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2097 Jungseong and Jongseong) should be 0
2098 [22078] nss: nss_files performance issue in multi mode
2099 [22082] math: bits/math-finite.h exp10 condition
2100 [22086] libc: pcprofiledump incorrect cross-endian condition
2101 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2102 [22095] network: Name server address allocation memory leak in resolv.conf
2104 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2106 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2107 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2109 [22111] malloc: malloc: per thread cache is not returned when thread exits
2110 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2111 [22134] libc: [linux] implement fexecve with execveat
2112 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2114 [22145] libc: ttyname() gives up too early in the face of namespaces
2115 [22146] math: C++ build issue with float128 on x86_64
2116 [22153] nptl: nptl: save error code before process termination
2117 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2118 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2119 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2120 [22165] libc: [hppa] Text relocations in libc.so
2121 [22180] libc: destructor registered via __cxa_atexit is called twice
2122 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2123 symlinks") cause "make" segfaults
2124 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2126 [22207] libc: FAIL: stdlib/test-atexit-race
2127 [22225] math: nearbyint arithmetic moved before feholdexcept
2128 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2129 [22235] math: iscanonical in C++ and float128
2130 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2131 the svid compat wrapper
2132 [22244] math: ynf and yn are wrong without the svid compat wrapper
2133 [22273] libc: Improper assert in Linux posix_spawn implementation
2134 [22284] libc: -pg -pie doesn't work
2135 [22292] locale: localedef exits with error 4 when it should be error 1
2136 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2137 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2139 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2140 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2142 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2143 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2144 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2145 [22322] libc: [mips64] wrong bits/long-double.h installed
2146 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2147 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2149 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2150 [22343] malloc: Integer overflow in posix_memalign
2151 [22347] libc: getrandom() returns the number of bytes that were copied to
2152 the buffer even though the comments say "Return 0 on success and -1 on
2154 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2155 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2157 [22370] dynamic-link: Incorrect note padding check
2158 [22375] libc: malloc returns pointer from tcache_get when should return
2159 NULL (CVE-2017-17426)
2160 [22377] math: iseqsig, float128 and C++
2161 [22382] localedata: Error in tpi_PG locale
2162 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2163 inside the ASCII printable range
2164 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2166 [22403] localedata: Slash needs escaping in some locales
2167 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2168 [22409] network: res_hnok does not accept some host names used on the
2170 [22412] network: res_dnok, res_hnok should perform syntax checks
2171 [22413] network: ns_name_pton ignores syntactically invalid trailing
2173 [22415] stdio: setvbuf can lead to invalid free/segfault
2174 [22432] build: Non-deterministic build
2175 [22439] malloc: malloc_info should compute summary statistics for all sub-
2177 [22442] network: if_nametoindex could report index for the wrong
2178 networking interface
2179 [22446] build: aliasing violation calling readlink in handle_request
2180 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2181 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2182 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2183 __nscd_hash/__nss_hash
2184 [22463] network: p_secstodate overflow handling
2185 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2186 [22478] libc: sigwait can fail with EINTR
2187 [22505] libc: ldconfig processes include directive in locale-specific
2189 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2190 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2191 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2192 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2193 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2194 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2195 same as for Croatian
2196 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2197 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2198 [22577] libc: missing newline after "cannot allocate TLS data structures
2200 [22588] manual: manual/conf.texi: missing underscore in front of
2202 [22593] math: nextafter and nexttoward are declared with const attribute
2203 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2204 [22603] string: ia64 memchr overflows internal pointer check
2205 [22605] libc: SH clone does not set the exit code correctly
2206 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2208 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2209 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2210 modified in case of success
2211 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2212 [22615] manual: manual: ambiguous wording about errno value in case of
2214 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2216 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2217 binaries or if /proc is not mounted (CVE-2017-16997)
2218 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2219 [22630] build: $(no-pie-ldflag) is no longer effective
2220 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2221 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2222 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2223 [22637] nptl: guard size is subtracted from thread stack size instead of
2225 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2226 [22657] localedata: hu_HU: Avoid double space in date
2227 [22660] math: fmax, fmin sNaN handling on alpha
2228 [22664] libc: New warning of GCC8
2229 [22665] math: alpha: ceil and floor raise inexact exceptions
2230 [22666] math: alpha: trunc raise inexact exceptions
2231 [22667] libc: makecontext lacks stack alignment on i386
2232 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2233 [22679] libc: getcwd(3) can succeed without returning an absolute path
2235 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2236 elision and tunables
2237 [22687] math: [powerpc-nofpu] complex long double functions spurious
2239 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2240 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2241 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2243 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2244 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2246 [22701] nis: Incomplete removal of libnsl
2247 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2248 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2249 [22715] dynamic-link: FAIL: elf/tst-audit10
2250 [22719] libc: Backtrace tests fail on hppa
2251 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2252 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2253 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2254 before the first call to crypt_r () in crypt/badsalttest.c
2261 * A per-thread cache has been added to malloc. Access to the cache requires
2262 no locks and therefore significantly accelerates the fast path to allocate
2263 and free small amounts of memory. Refilling an empty cache requires locking
2264 the underlying arena. Performance measurements show significant gains in a
2265 wide variety of user workloads. Workloads were captured using a special
2266 instrumented malloc and analyzed with a malloc simulator. Contributed by
2267 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2269 * Unicode 10.0.0 Support: Character encoding, character type info, and
2270 transliteration tables are all updated to Unicode 10.0.0, using
2271 generator scripts contributed by Mike FABIAN (Red Hat).
2272 These updates cause user visible changes, especially the changes in
2273 wcwidth for many emoji characters cause problems when emoji sequences
2274 are rendered with pango, see for example:
2275 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2277 * Collation of Hungarian has been overhauled and is now consistent with "The
2278 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2281 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2283 - The GNU C Library will now detect when /etc/resolv.conf has been
2284 modified and reload the changed configuration. The new resolver option
2285 “no-reload” (RES_NORELOAD) disables this behavior.
2287 - The GNU C Library now supports an arbitrary number of search domains
2288 (configured using the “search” directive in /etc/resolv.conf);
2289 previously, there was a hard limit of six domains. For backward
2290 compatibility, applications that directly modify the ‘_res’ global
2291 object are still limited to six search domains.
2293 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2294 Library will now randomly pick a name server from the configuration as a
2295 starting point. (Previously, the second name server was always used.)
2297 * The tunables feature is now enabled by default. This allows users to tweak
2298 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2300 * New function reallocarray, which resizes an allocated block (like realloc)
2301 to the product of two sizes, with a guaranteed clean failure upon integer
2302 overflow in the multiplication. Originally from OpenBSD, contributed by
2303 Dennis Wölfing and Rüdiger Sonderfeld.
2305 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2306 These are extended versions of preadv and pwritev, respectively, taking an
2307 additional flags argument. The set of supported flags depends on the
2308 running kernel; full support currently requires kernel 4.7 or later.
2310 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2311 create a new session ID for the spawned process. This feature is
2312 scheduled to be added to the next major revision of POSIX; for the time
2313 being, it is available under _GNU_SOURCE.
2315 * errno.h is now safe to use from C-preprocessed assembly language on all
2316 supported operating systems. In this context, it will only define the
2317 Exxxx constants, as preprocessor macros expanding to integer literals.
2319 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2320 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2321 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2322 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2324 To compile programs that use this feature, the compiler must support
2325 128-bit floating point with the type name _Float128 (as defined by TS
2326 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2327 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2328 must be defined to make the new interfaces visible.
2330 The new functions and macros correspond to those present for other
2331 floating-point types (except for a few obsolescent interfaces not
2332 supported for the new type), with F128 or f128 suffixes; for example,
2333 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2334 printf or scanf formats for the new type; the strfromf128 and strtof128
2335 interfaces should be used instead.
2337 Deprecated and removed features, and other changes affecting compatibility:
2339 * The synchronization that pthread_spin_unlock performs has been changed to
2340 now be equivalent to a C11 atomic store with release memory order to the
2341 spin lock's memory location. Previously, several (but not all)
2342 architectures used stronger synchronization (e.g., containing what is
2343 often called a full barrier). This change can improve performance, but
2344 may affect odd fringe uses of spin locks that depend on the previous
2345 behavior (e.g., using spin locks as atomic variables to try to implement
2346 Dekker's mutual exclusion algorithm).
2348 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2351 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2352 will only be built and installed when the GNU C Library is configured with
2353 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2354 as TIRPC or rpcsvc-proto, to be used.
2356 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2357 libnss_compat, are deprecated, and will not be built or installed by
2360 The NIS(+) support library, libnsl, is also deprecated. By default, a
2361 compatibility shared library will be built and installed, but not headers
2362 or development libraries. Only a few NIS-related programs require this
2363 library. (In particular, the GNU C Library has never required programs
2364 that use 'gethostbyname' to be linked with libnsl.)
2366 Replacement implementations based on TIRPC, which additionally support
2367 IPv6, are available from <https://github.com/thkukuk/>. The configure
2368 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2369 name service modules, to be built and installed.
2371 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2372 support is enabled, the configured recursive resolver must support EDNS.
2373 (Responding to EDNS-enabled queries with responses which are not
2374 EDNS-enabled is fine, but FORMERR responses are not.)
2376 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2377 servers have not supported this opcode for a long time.
2379 * The _res_opcodes variable has been removed from libresolv. It had been
2380 exported by accident.
2382 * <string.h> no longer includes inline versions of any string functions,
2383 as this kind of optimization is better done by the compiler. The macros
2384 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2386 * The nonstandard header <xlocale.h> has been removed. Most programs should
2387 use <locale.h> instead. If you have a specific need for the definition of
2388 locale_t with no other declarations, please contact
2389 libc-alpha@sourceware.org and explain.
2391 * The obsolete header <sys/ultrasound.h> has been removed.
2393 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2395 * The obsolete function cfree has been removed. Applications should use
2398 * The stack_t type no longer has the name struct sigaltstack. This changes
2399 the C++ name mangling for interfaces involving this type.
2401 * The ucontext_t type no longer has the name struct ucontext. This changes
2402 the C++ name mangling for interfaces involving this type.
2404 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2405 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2406 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2407 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2408 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2409 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2410 fpregset_t type no longer has the name struct fpu. This changes the C++
2411 name mangling for interfaces involving those types.
2413 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2414 synced with the kernel:
2416 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2417 are not supported on this architecture and have been removed.
2419 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2420 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2421 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2423 Programs that assume the GET/SETREGS ptrace requests are universally
2424 available will now fail to build, instead of malfunctioning at runtime.
2426 Changes to build and runtime requirements:
2428 * Linux kernel 3.2 or later is required at runtime, on all architectures
2429 supported by that kernel. (This is a change from version 2.25 only for
2432 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2434 * On most architectures, GCC 4.9 or later is required to build the GNU C
2435 Library. On powerpc64le, GCC 6.2 or later is required.
2437 Older GCC versions and non-GNU compilers are still supported when
2438 compiling programs that use the GNU C Library. (We do not know exactly
2439 how old, and some GNU extensions to C may be _de facto_ required. If you
2440 are interested in helping us make this statement less vague, please
2441 contact libc-alpha@sourceware.org.)
2443 Security related changes:
2445 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2446 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2448 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2449 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2451 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2452 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2455 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2456 fixed (CVE-2017-12133).
2458 The following bugs are resolved with this release:
2460 [984] network: Respond to changed resolv.conf in gethostbyname
2461 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2462 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2464 [12189] libc: __stack_chk_fail should not attempt a backtrace
2466 [14096] time: Race condition on timezone/tst-timezone.out
2467 [14172] localedata: az_IR: new locale
2468 [14995] build: glibc fails to build if gold is the default linker, even if
2470 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2471 [16637] network: inet_pton function is accepting IPv6 with bad format
2472 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2473 x86 and other generic code
2474 [16875] localedata: ko_KR: fix lang_name
2475 [17225] localedata: ar_SY: localized month names for May and June are
2477 [17297] localedata: da_DK: wrong date_fmt string
2478 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2479 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2480 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2481 [19066] localedata: ar_SA abbreviated day and month names are in English
2482 [19569] network: resolv: Support an arbitrary number of search domains
2483 [19570] network: Implement random DNS server selection in the stub
2485 [19838] locale: localedef fails on PA-RISC
2486 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2487 order of 0D36 and 0D37
2488 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2490 [20098] libc: FAIL: debug/backtrace-tst on hppa
2491 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2493 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2495 [20313] localedata: Update locale data to Unicode 9.0
2496 [20424] manual: Document how to provide a malloc replacement
2497 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2499 [20686] locale: Add el_GR@euro to SUPPORTED.
2500 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2501 failures consistently
2502 [21015] dynamic-link: Document and fix --enable-bind-now
2503 [21016] nptl: pthread_cond support is broken on hppa
2504 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2505 frame-pointer on i386
2506 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2508 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2509 [21088] libc: Build fails with --enable-static-nss
2510 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2511 generic c code is used
2512 [21109] libc: Tunables broken on big-endian
2513 [21112] math: powf has large ulp errors with base close to 1 and exponent
2515 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2517 [21120] malloc: glibc malloc is incompatible with GCC 7
2518 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2520 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2521 (-0.0) when linking with -lieee
2522 [21171] math: log10, log2 and lgamma return incorrect results
2523 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2524 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2525 [21207] localedata: ce_RU: update weekdays from CLDR
2526 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2527 [21217] localedata: Update months from CLDR-31
2528 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2529 [21243] libc: support_delete_temp_file should issue warning for failed
2531 [21244] libc: support resolv_test_start() socket fd close should be
2533 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2534 new posix_spawn implementation
2535 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2536 leads to lower CPU frequency
2537 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2538 [21261] libc: [sparc64] bits/setjmp.h namespace
2539 [21267] network: [mips] bits/socket.h IOC* namespace
2540 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2541 [21270] libc: mmap64 silently truncates large offset values
2542 [21275] libc: posix_spawn always crashes on ia64 now
2543 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2544 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2545 [21289] libc: Incorrect declaration for 32-bit platforms with
2546 _FILE_OFFSET_BITS=64 causes build error
2547 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2548 not support gethostbyname4_r
2549 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2551 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2553 [21340] libc: Support POSIX_SPAWN_SETSID
2554 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2555 [21359] network: ns_name_pack needs additional byte in destination buffer
2556 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2557 against fragmentation attacks (CVE-2017-12132)
2558 [21369] network: resolv: Remove EDNS fallback
2559 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2561 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2562 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2563 [21393] stdio: Missing dup3 error check in freopen, freopen64
2564 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2565 [21399] localedata: Bad description for U00EC in
2566 localedata/charmaps/CP1254
2567 [21411] malloc: realloc documentation error
2568 [21426] network: sys/socket.h uio.h namespace
2569 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2570 [21445] libc: signal.h bsd_signal namespace
2571 [21455] network: Network headers stdint.h namespace
2572 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2574 [21475] network: resolv: Overlong search path is truncated mid-label
2575 [21511] libc: sigstack namespace
2576 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2577 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2578 bits/syscall.h: No such file or directory
2579 [21517] libc: struct sigaltstack namespace
2580 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2581 [21533] localedata: Update locale data to Unicode 10.0
2583 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2584 junk at end of line, first unrecognized character is `@'
2585 [21538] libc: SIG_HOLD missing for XPG4
2586 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2587 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2588 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2589 [21543] libc: sigevent namespace
2590 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2591 size for general purpose registers in mcontext_t structure
2592 [21550] libc: sigwait namespace
2593 [21552] libc: XPG4 bsd_signal namespace
2594 [21554] libc: sigpause namespace
2595 [21560] libc: sys/wait.h signal.h namespace
2596 [21561] libc: waitid namespace
2597 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2598 '/usr/include/stdlib.h': Permission denied
2599 [21575] libc: sys/wait.h missing struct rusage definition
2600 [21584] libc: sigaltstack etc namespace
2601 [21597] libc: siginterrupt namespace
2602 [21607] math: hppa: FAIL: math/test-tgmath
2603 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2605 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2606 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2607 stack and heap (CVE-2017-1000366)
2608 [21625] libc: wait3 namespace
2609 [21654] nss: Incorrect pointer alignment in NSS group merge result
2611 [21657] network: Parse interface zone id for node-local multicast
2612 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2614 [21666] libc: .symver is used on common symbol
2615 [21668] network: resolv: res_init cross-thread broadcast introduces race
2617 [21687] math: tgmath.h totalorder, totalordermag return type
2618 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2620 [21696] libc: Incorrect assumption of of __cpu_mask in
2621 posix/sched_cpucount.c
2622 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2623 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2625 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2626 leading to relocation crash
2627 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2628 `resolv_conf_matches (resp, conf)' failed.
2629 [21710] localedata: Added Samoan language locale for Samoa
2630 [21711] localedata: Pashto yesstr/nostr locale are missing
2631 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2632 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2633 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2634 [21723] localedata: yesstr/nostr missing for Chinese language locale
2635 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2637 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2639 [21728] localedata: New Locale for Tongan language
2640 [21729] localedata: incorrect LC_NAME fields for hi_IN
2641 [21733] localedata: yesstr and nostr are missing for zh_HK
2642 [21734] localedata: Missing yesstr and nostr are for kw_GB
2643 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2644 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2645 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2646 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2648 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2650 [21749] localedata: Wrong abbreviated day name (“abday”) for
2652 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2653 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2654 [21759] localedata: missing yesstr and nostr for Tigrinya
2655 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2656 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2657 [21767] localedata: Missing Bislama locales
2658 [21768] localedata: Missing yesstr and nostr for aa_ET
2659 [21770] localedata: Missing Field in li_NL
2660 [21778] nptl: Robust mutex may deadlock
2661 [21779] libc: MicroBlaze segfaults when loading libpthread
2662 [21783] localedata: Fix int_select international_call_prefixes
2663 [21784] localedata: Inconsistency in country_isbn
2664 [21788] localedata: Missing Country Postal Abbreviations
2665 [21794] localedata: Added-country_isbn-for-Italy
2666 [21795] localedata: Add/Fix country_isbn for France
2667 [21796] localedata: Added country_isbn for Republic of Korea
2668 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2669 [21799] localedata: Added int_select international_call_prefixes
2670 [21801] localedata: Added int_select international_call_prefixes
2671 [21804] nptl: Double semicolon in thread-shared-types.h
2672 [21807] localedata: LC_ADDRESS fix for pap_CW
2673 [21808] localedata: Fix LC_ADDRESS for pap_AW
2674 [21821] localedata: Added country_name in mai_IN
2675 [21822] localedata: Fix LC_TIME for mai_IN
2676 [21823] localedata: missing yesstr, nostr for sa_IN
2677 [21825] localedata: Fix name_mrs for mag_IN
2678 [21828] localedata: 2.26 changelog should mention user visible changes
2680 [21835] localedata: Added Maithili language locale for Nepal
2681 [21838] localedata: Removed redundant data for the_NP
2682 [21839] localedata: Fix LC_MONETARY for ta_LK
2683 [21844] localedata: Fix Latin characters and Months Sequence.
2684 [21848] localedata: Fix mai_NP Title Name
2689 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2690 24731-2:2010, is supported to enable declarations of functions from that
2691 TR. Note that not all functions from that TR are supported by the GNU C
2694 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2695 18661-1:2014, is supported to enable declarations of functions and macros
2696 from that TS. Note that not all features from that TS are supported by
2699 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2700 18661-4:2015, is supported to enable declarations of functions and macros
2701 from that TS. Note that most features from that TS are not supported by
2704 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2705 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2706 Since the GNU C Library defaults to a much newer revision of POSIX, this
2707 will only affect programs that specifically request an old conformance
2708 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2709 see a change in the visible declarations, but a program compiled with
2710 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2713 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2714 defined by all multithreaded code, but glibc has not required this for
2717 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2718 means that in a future release, the macros “major”, “minor”, and “makedev”
2719 will only be available from <sys/sysmacros.h>.
2721 These macros are not part of POSIX nor XSI, and their names frequently
2722 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2723 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2724 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2727 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2728 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2729 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2731 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2732 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2733 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2734 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2735 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2736 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2737 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2738 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2739 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2740 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2741 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2744 * New <math.h> features are added from TS 18661-1:2014:
2746 - Signaling NaN macros: SNANF, SNAN, SNANL.
2748 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2749 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2750 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2752 - llogb functions: the llogb, llogbf and llogbl functions, and the
2753 FP_LLOGB0 and FP_LLOGBNAN macros.
2755 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2758 - Comparison macros: iseqsig.
2760 - Classification macros: iscanonical, issubnormal, iszero.
2762 - Total order functions: totalorder, totalorderf, totalorderl,
2763 totalordermag, totalordermagf, totalordermagl.
2765 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2767 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2768 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2770 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2771 are added to libc. They convert a floating-point number into string.
2773 * Most of glibc can now be built with the stack smashing protector enabled.
2774 It is recommended to build glibc with --enable-stack-protector=strong.
2775 Implemented by Nick Alcock (Oracle).
2777 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2778 intended to be used instead of memset() to erase sensitive data after use;
2779 the compiler will not optimize out calls to explicit_bzero even if they
2780 are "unnecessary" (in the sense that no _correct_ program can observe the
2781 effects of the memory clear).
2783 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2784 to float instead of double. This does not affect the ABI of any libraries
2785 that are part of the GNU C Library, but may affect the ABI of other
2786 libraries that use this type in their interfaces.
2788 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2789 float_t and double_t types are now defined to long double instead of float
2790 and double. These options are not the default, and this does not affect
2791 the ABI of any libraries that are part of the GNU C Library, but it may
2792 affect the ABI of other libraries that use this type in their interfaces,
2793 if they are compiled or used with those options.
2795 * The getentropy and getrandom functions, and the <sys/random.h> header file
2798 * The buffer size for byte-oriented stdio streams is now limited to 8192
2799 bytes by default. Previously, on Linux, the default buffer size on most
2800 file systems was 4096 bytes (and thus remains unchanged), except on
2801 network file systems, where the buffer size was unpredictable and could be
2802 as large as several megabytes.
2804 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2805 for the Linux quota interface which predates kernel version 2.4.22 has
2808 * The malloc_get_state and malloc_set_state functions have been removed.
2809 Already-existing binaries that dynamically link to these functions will
2810 get a hidden implementation in which malloc_get_state is a stub. As far
2811 as we know, these functions are used only by GNU Emacs and this change
2812 will not adversely affect already-built Emacs executables. Any undumped
2813 Emacs executables, which normally exist only during an Emacs build, should
2814 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2816 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2817 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2818 “no-ip6-dotint” had already been the default, and support for the
2819 “ip6-dotint” option was removed from the Internet in 2006.
2821 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2822 flag from <resolv.h> have been removed. The option relied on a
2823 backwards-incompatible DNS extension which was never deployed on the
2826 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2827 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2828 They were already unimplemented.
2830 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2831 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2832 removed again from the IETF name lookup interface specification in RFC
2833 2553. Applications should use getaddrinfo instead.
2835 * DNSSEC-related declarations and definitions have been removed from the
2836 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2837 decode the data part of DNSSEC record types. Previous versions of glibc
2838 only implemented minimal support for the previous version of DNSSEC, which
2839 is incompatible with the currently deployed version.
2841 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2842 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2843 <arpa/nameser.h> header file because the distinction between RR types and
2844 meta-RR types is not officially standardized, subject to revision, and
2845 thus not suitable for encoding in a macro.
2847 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2848 and rhook members of the res_state type in <resolv.h> have been removed.
2849 The glibc stub resolver did not support these hooks, but the header file
2850 did not reflect that.
2852 * For multi-arch support it is recommended to use a GCC which has
2853 been built with support for GNU indirect functions. This ensures
2854 that correct debugging information is generated for functions
2855 selected by IFUNC resolvers. This support can either be enabled by
2856 configuring GCC with '--enable-gnu-indirect-function', or by
2857 enabling it by default by setting 'default_gnu_indirect_function'
2858 variable for a particular architecture in the GCC source file
2861 * GDB pretty printers have been added for mutex and condition variable
2862 structures in POSIX Threads. When installed and loaded in gdb these pretty
2863 printers show various pthread variables in human-readable form when read
2864 using the 'print' or 'display' commands in gdb.
2866 * Tunables feature added to allow tweaking of the runtime for an application
2867 program. This feature can be enabled with the '--enable-tunables' configure
2868 flag. The GNU C Library manual has details on usage and README.tunables has
2869 instructions on adding new tunables to the library.
2871 * A new version of condition variables functions have been implemented in
2872 the NPTL implementation of POSIX Threads to provide stronger ordering
2875 * A new version of pthread_rwlock functions have been implemented to use a more
2876 scalable algorithm primarily through not using a critical section anymore to
2879 Security related changes:
2881 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2882 have been created with makecontext could fail to terminate due to a
2883 missing .cantunwind annotation. This has been observed to lead to a hang
2884 (denial of service) in some Go applications compiled with gccgo. Reported
2885 by Andreas Schwab. (CVE-2016-6323)
2887 * The DNS stub resolver functions would crash due to a NULL pointer
2888 dereference when processing a query with a valid DNS question type which
2889 was used internally in the implementation. The stub resolver now uses a
2890 question type which is outside the range of valid question type values.
2893 The following bugs are resolved with this release:
2895 [4099] stdio: Overly aggressive caching by stream i/o functions.
2896 [7065] build: Support building glibc with -fstack-protector or -fstack-
2898 [9842] localedata: en_CA: incorrect date format
2899 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2900 before it started waiting
2901 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2902 [15765] nptl: sem_open is wrongly a cancellation point
2903 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2904 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2906 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2907 library linked with pthread
2908 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2909 "FIXME: Ingo" issue)
2910 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2911 [17252] libc: getrandom and getentropy syscall
2912 [17730] malloc: thread-local storage is sometimes improperly free()'d
2913 after being __libc_memalign()'d
2914 [18241] stdio: failed fseek on memstream does not set errno and can fail
2916 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2918 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2919 PTHREAD_PRIO_INHERIT mutex on ARM
2920 [18784] network: res_query and related function crash for special record
2921 type queries (CVE-2015-5180)
2922 [19380] math: strtod does not raise "inexact"
2923 [19387] string: Integer overflow in memchr
2924 [19390] string: Integer overflow in strncat
2925 [19398] build: linknamespace tests fail with massively parallel build
2926 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2928 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2929 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2930 [19514] libc: [PATCH] Fix spelling errors in spelling
2931 "implement"/"implementation" in several places
2932 [19582] network: Deprecate RES_USE_INET6
2933 [19673] manual: clog10 docs appear to be erroneous
2934 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2935 causes a segmentation fault
2936 [19826] libc: invalid pointer returned from __tls_get_addr with static
2938 [20016] network: resolv: Remove hooks support from the API
2939 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2941 [20033] math: [x86_64] vectorized math function don't call the __finite
2943 [20116] nptl: use after free in pthread_create
2944 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2945 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2947 [20311] nptl: please install proc_service.h
2948 [20366] libc: Compilation errors in installed headers in strict-compliance
2950 [20370] malloc: malloc: Arena free list management is still racy
2951 (incorrect fix in bug 19243)
2952 [20386] libc: assert (X = 0) does not result in GCC warning
2953 [20432] malloc: malloc: Minimize interface required for interposition
2954 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2955 in _Unwind_Backtrace (CVE-2016-6323)
2956 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2957 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2959 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2960 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2961 [20477] network: resolv: incorrect double-checked locking related to
2963 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2965 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2967 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2968 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2969 cause transition penalty
2970 [20517] math: sparcv9 missing fdiml compat symbol
2971 [20524] manual: strverscmp is inconsistent
2972 [20525] libc: <sys/quota.h> should be based on kernel headers
2973 [20539] math: GCC 7 -static -lm fails to link at -O3
2974 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2976 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2978 [20591] network: Remove obsolete DNSSEC support
2979 [20592] network: DNS resource record type classification macros in
2980 <arpa/nameser.h> are incorrect
2981 [20593] network: Update DNS RR type definitions
2982 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2983 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2985 [20629] network: libresolv: Remove support for bitstring labels
2987 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2988 assertion: "maxidx >= 2"
2989 [20660] math: [arm] Use VSQRT
2990 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2991 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2992 [20689] libc: Test for FMA should also check for AVX.
2993 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2994 [20715] math: iszero macro breaks existing code
2995 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2996 [20728] libc: powerpc: Missing TOC stub in clone
2997 [20729] build: glibc-2.24 fails to build for i486 with -Os
2998 [20750] build: Build fails with default PIE enabled gcc-6.x
2999 [20768] math: [alpha] sqrt fegetenv namespace
3000 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3002 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3003 __FLT_EVAL_METHOD__ is 2
3004 [20790] network: rpcgen buffer overrun in get_prog_declaration
3005 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3006 [20829] libc: crypt snprintf namespace
3007 [20847] libc: tst-vfork3 failure
3008 [20855] math: Default bits/mathdef.h has inappropriate float_t
3009 [20859] math: [sh4] FP_ILOGB0 invalid
3010 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3011 U+20AC), not same as GBK
3012 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3013 [20916] math: pow handling of sNaN arguments
3014 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3015 [20919] math: Bad pow (qNaN, 0) result with -lieee
3016 [20940] math: hypot sNaN handling
3017 [20947] math: fmax, fmin sNaN handling
3018 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3019 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3021 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3022 [20973] nptl: robust mutexes: Lost wake-ups
3023 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3024 [20978] nis: strlen on null pointer in nss_nisplus
3025 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3027 [21014] string: i686 memchr overflows internal pointer check
3028 [21019] libc: [mips] n32 lseek incorrect on overflow
3029 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3030 [21026] libc: [MIPS] readahead syscall is broken on n64
3031 [21028] math: Fallback fesetexceptflag should always succeed
3032 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3033 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3035 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3036 [21061] librt: [microblaze] librt lost clock_* exports
3037 [21073] libc: tunables: insecure environment variables passed to
3038 subprocesses with AT_SECURE
3039 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3043 * The minimum Linux kernel version that this version of the GNU C Library
3044 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3045 kernel version 2.6.32 or later suffices (on architectures that already
3046 required kernel versions more recent than 3.2, those requirements remain
3047 unchanged). Linux 3.2 or later kernel headers are required on all
3050 * The pap_AN locale has been deleted. This has been deprecated for a long
3051 time. It has been replaced by pap_AW & pap_CW, both of which have long
3052 been included in previous releases.
3054 * The readdir_r and readdir64_r functions have been deprecated. It is
3055 recommended to use readdir and readdir64 instead.
3057 * The type “union wait” has been removed. It was deprecated in the early
3058 1990s and never part of POSIX. Application code should use the int type
3059 instead of “union wait”.
3061 * A new NSS action is added to facilitate large distributed system
3062 administration. The action, MERGE, allows remote user stores like LDAP
3063 to be merged into local user stores like /etc/groups in order to provide
3064 easy to use, updated, and managed sets of merged credentials. The new
3065 action can be used by configuring it in /etc/nsswitch.conf:
3066 group: files [SUCCESS=merge] nis
3067 Implemented by Stephen Gallagher (Red Hat).
3069 * The deprecated __malloc_initialize_hook variable has been removed from the
3072 * The long unused localedef --old-style option has been removed. It hasn't
3073 done anything in over 16 years. Scripts using this option can safely
3076 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3077 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3078 return the next representable value in the direction of positive infinity
3079 and the nextdown functions return the next representable value in the
3080 direction of negative infinity. These are currently enabled as GNU
3083 Security related changes:
3085 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3086 could result in a stack overflow when getnetbyname was called with an
3087 overly long name. (CVE-2016-3075)
3089 * Previously, getaddrinfo copied large amounts of address data to the stack,
3090 even after the fix for CVE-2013-4458 has been applied, potentially
3091 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3092 instead. Reported by Michael Petlan. (CVE-2016-3706)
3094 * The glob function suffered from a stack-based buffer overflow when it was
3095 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3096 Reported by Alexander Cherepanov. (CVE-2016-1234)
3098 * The Sun RPC UDP client could exhaust all available stack space when
3099 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3100 alloca plugin for GCC. (CVE-2016-4429)
3102 * The IPv6 name server management code in libresolv could result in a memory
3103 leak for each thread which is created, performs a failing naming lookup,
3104 and exits. Over time, this could result in a denial of service due to
3105 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3107 The following bugs are resolved with this release:
3109 [1170] localedata: ne_NP: update Nepali locale definition file
3110 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3112 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3113 [6796] math: fdim() does not set errno on overflow
3114 [10354] libc: posix_spawn should use vfork() in more cases than presently
3115 [11213] localedata: localedata: add copyright disclaimer to locale files
3116 [12143] localedata: chr_US: new Cherokee locale
3117 [12450] localedata: sgs_LT: new locale
3118 [12676] localedata: ln_CD: new locale
3119 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3121 [13304] math: fma, fmaf, fmal produce wrong results
3122 [14259] build: --localedir arg to configure is ignored
3123 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3124 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3125 [14934] localedata: es_CL: wrong first weekday chilean locale
3126 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3128 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3130 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3131 [15368] nptl: raise() is not async-signal-safe
3132 [15479] math: ceil, floor, round and trunc raise inexact exception
3133 [15578] localedata: kk_KZ: various updates
3134 [16003] localedata: pap_AN: punt old locale
3135 [16137] localedata: iw_IL: punt old locale
3136 [16190] localedata: eo: new esperanto locale
3137 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3138 [16742] malloc: race condition: pthread_atfork() called before first
3139 malloc() results in unexpected locking behaviour/deadlocks
3140 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3142 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3143 [17565] localedata: pt_PT: wrong (work-)week start
3144 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3145 [17950] build: Build fails with -msse
3146 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3147 [18433] libc: posix_spawn does not return correctly upon failure to
3149 [18453] localedata: charmaps/IBM875: incorrect codes
3150 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3152 [18896] localedata: he_IL: improvements for currency
3153 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3154 Romanian locale data
3155 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3157 [19056] libc: Deprecate readdir_r
3158 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3160 [19198] localedata: nl_NL: small improvements for Dutch locales
3161 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3162 nameservers (CVE-2016-5417)
3163 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3165 [19400] locale: Language missing in "iso-639.def", trivial fix in
3167 [19431] malloc: Deadlock between fflush, getdelim, and fork
3168 [19505] libc: Incorrect file descriptor validity checks in
3169 posix_spawn_file_actions_add{open,close,dup2}
3170 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3171 when using RTLD_NEXT
3172 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3173 `intl/{gettextP,loadinfo}.h'
3174 [19534] libc: execle, execlp may use malloc
3175 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3176 [19573] network: res_nclose and __res_maybe_init disagree about name
3177 server initialization, breaking Hesiod
3178 [19575] localedata: Status of GB18030 tables
3179 [19581] localedata: sr_* date_fmt string contains additional newline
3180 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3182 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3183 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3184 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3185 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3187 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3189 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3191 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3192 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3193 [19633] locale: strfmon_l applies global locale to number formatting
3194 [19642] network: Memory leak in getnameinfo
3195 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3196 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3198 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3199 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3201 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3202 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3204 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3206 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3208 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3209 pointers and lengths in error-case.
3210 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3211 report errors on UTF-16 surrogates values.
3212 [19755] nscd: nscd assertion failure in gc
3213 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3214 [19759] libc: mempcpy shouldn't be inlined
3215 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3216 [19765] libc: s390 needs an optimized mempcpy
3217 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3218 NAME_MAX limit assumption (CVE-2016-1234)
3219 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3220 [19787] network: Missing and incorrect truncation checks in getnameinfo
3221 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3223 [19791] network: Assertion failure in res_query.c with un-connectable name
3225 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3226 [19822] math: libm.so install clobbers old version
3227 [19825] network: resolv: send_vc can return uninitialized data in second
3228 response to getaddrinfo
3229 [19830] network: nss_dns: should check RDATA length against buffer length
3230 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3231 confronted with A/AAAA records of invalid size
3232 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3233 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3234 [19853] stdio: Printing IBM long double in decimal with high precision is
3236 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3237 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3238 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3240 [19865] network: Assertion failure or memory leak in
3241 _nss_dns_getcanonname_r
3242 [19868] network: nss_dns: netent code does not skip over non-PTR records
3243 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3245 [19881] string: Improve x86-64 memset
3246 [19907] string: Incorrect memcpy tests
3247 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3249 [19925] libc: termios.h XCASE namespace
3250 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3251 [19929] libc: limits.h NL_NMAX namespace
3252 [19931] stdio: Memory leak in vfprintf
3253 [19957] libc: clone(CLONE_VM) access invalid parent memory
3254 [19963] localedata: en_IL: New locale
3255 [19989] stdio: stdio.h cuserid namespace
3256 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3258 [19996] locale: langinfo.h nl_langinfo_l namespace
3259 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3260 [20010] network: getaddrinfo: Stack overflow in hostent translation
3262 [20012] stdio: libio: fmemopen append mode failure
3263 [20014] stdio: stdio.h namespace for pre-threads POSIX
3264 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3265 [20023] libc: fcntl.h timespec namespace
3266 [20024] math: [x86_64] vectorized sincos trashes the stack
3267 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3268 [20041] time: sys/time.h timespec namespace
3269 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3270 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3271 [20051] libc: ttyslot in wrong header under wrong conditions
3272 [20054] libc: gethostname not declared for XPG4
3273 [20055] libc: termios.h missing tcgetsid for XPG4
3274 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3276 [20073] libc: sys/stat.h fchmod namespace
3277 [20074] libc: stdlib.h rand_r namespace
3278 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3279 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3281 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3282 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3284 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3285 [20119] libc: Wrong mask for processors level type from CPUID
3286 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3287 AS not supporting AVX512
3288 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3290 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3291 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3293 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3294 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3295 [20178] libc: posix_spawn{p} should not call exit
3296 [20191] stdio: libio: vtables hardening
3297 [20195] string: FMA4 detection requires CPUID execution with register
3299 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3300 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3302 [20212] math: acos (sNaN) returns sNaN
3303 [20213] math: asin (sNaN) returns sNaN
3304 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3305 [20218] math: [i386] asinhl (sNaN) returns sNaN
3306 [20219] math: [i386] atanhl (sNaN) returns sNaN
3307 [20222] stdio: fopencookie: Mangle function pointers
3308 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3309 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3310 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3312 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3313 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3314 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3315 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3316 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3317 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3318 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3319 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3320 [20240] math: modf (sNaN) returns sNaN
3321 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3322 [20250] math: frexp (sNaN) returns sNaN
3323 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3324 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3326 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3327 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3328 subscript is below array bounds [-Werror=array-bounds]
3329 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3330 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3332 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3333 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3335 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3336 "invalid" exceptions
3337 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3338 [20316] localedata: id_ID: Februari instead of Pebruari
3339 [20327] string: POWER8 strcasecmp returns incorrect result
3340 [20347] math: Failure: Test: j0_downward (0xap+0)
3341 [20348] libc: FAIL: misc/tst-preadvwritev64
3342 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3343 [20350] libc: There is no test for p{read,write}64
3344 [20357] math: Incorrect cos result for 1.5174239687223976
3345 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3349 * Unicode 8.0.0 Support: Character encoding, character type info, and
3350 transliteration tables are all updated to Unicode 8.0.0, using new
3351 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3352 These updates cause user visible changes, such as the fixes for bugs
3353 89, 16061, and 18568.
3355 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3356 kernel-internal CPU set size. This means that requests that change the
3357 CPU affinity which failed before (for example, an all-ones CPU mask) will
3358 now succeed. Applications that need to determine the effective CPU
3359 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3360 setting it because the kernel can adjust it (and the previous size check
3361 would not detect this in the majority of cases).
3363 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3364 the following new symbols are used: fts64_children, fts64_close,
3365 fts64_open, fts64_read and fts64_set.
3367 * getaddrinfo now detects certain invalid responses on an internal netlink
3368 socket. If such responses are received, an affected process will
3369 terminate with an error message of "Unexpected error <number> on netlink
3370 descriptor <number>" or "Unexpected netlink response of size <number> on
3371 descriptor <number>". The most likely cause for these errors is a
3372 multi-threaded application which erroneously closes and reuses the netlink
3373 file descriptor while it is used by getaddrinfo.
3375 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3376 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3377 unnecessary serialization of memory allocation requests across threads.
3378 The defect is now corrected. Users should see a substantial increase in
3379 the concurent throughput of allocation requests for applications which
3380 trigger this bug. Affected applications typically create and
3381 destroy threads frequently. (Bug 19048 was reported and analyzed by
3384 * There is now a --disable-timezone-tools configure option for disabling the
3385 building and installing of the timezone related utilities (zic, zdump, and
3386 tzselect). This is useful for people who build the timezone data and code
3387 independent of the GNU C Library.
3389 * The obsolete header <regexp.h> has been removed. Programs that require
3390 this header must be updated to use <regex.h> instead.
3392 * The obsolete functions bdflush, create_module, get_kernel_syms,
3393 query_module and uselib are no longer available to newly linked binaries;
3394 the header <sys/kdaemon.h> has been removed. These functions and header
3395 were specific to systems using the Linux kernel and could not usefully be
3396 used with the GNU C Library on systems with version 2.6 or later of the
3399 * Optimized string, wcsmbs and memory functions for IBM z13.
3400 Implemented by Stefan Liebler.
3402 * Newly linked programs that define a variable called signgam will no longer
3403 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3404 require signgam to be set by those functions must ensure that they use the
3405 variable provided by the GNU C Library and declared in <math.h>, without
3406 defining their own copy.
3408 * The minimum GCC version that can be used to build this version of the GNU
3409 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3410 still be used to compile programs using the GNU C Library.
3412 Security related changes:
3414 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3415 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3417 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3418 the pointer guard feature. It is always enabled. Previously,
3419 LD_POINTER_GUARD could be used to disable security hardening in binaries
3420 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3423 * An integer overflow in hcreate and hcreate_r could lead to an
3424 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3426 * The catopen function no longer has unbounded stack usage. Reported by
3427 Max. (CVE-2015-8779)
3429 * The nan, nanf and nanl functions no longer have unbounded stack usage
3430 depending on the length of the string passed as an argument to the
3431 functions. Reported by Joseph Myers. (CVE-2014-9761)
3433 * A stack-based buffer overflow was found in libresolv when invoked from
3434 libnss_dns, allowing specially crafted DNS responses to seize control
3435 of execution flow in the DNS client. The buffer overflow occurs in
3436 the functions send_dg (send datagram) and send_vc (send TCP) for the
3437 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3438 family. The use of AF_UNSPEC triggers the low-level resolver code to
3439 send out two parallel queries for A and AAAA. A mismanagement of the
3440 buffers used for those queries could result in the response of a query
3441 writing beyond the alloca allocated buffer created by
3442 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3443 the overflow. Thanks to the Google Security Team and Red Hat for
3444 reporting the security impact of this issue, and Robert Holiday of
3445 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3447 The following bugs are resolved with this release:
3449 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3450 [887] math: Math library function "logb" and "nextafter" inconsistent
3451 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3452 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3453 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3454 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3456 [4404] localedata: German translation of "Alarm clock" is misleading
3457 [6799] math: nextafter() and nexttoward() doen't set errno on
3458 overflow/underflow errors
3459 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3461 [10432] nis: _nss_nis_setnetgrent assertion failure
3462 [11460] libc: fts has no LFS support
3463 [12926] network: getaddrinfo()/make_request() may spin forever
3464 [13065] nptl: Race condition in pthread barriers
3465 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3466 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3468 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3469 [14912] libc: Rename non-installed bits/*.h headers
3470 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3471 [15367] math: Let gcc use __builtin_isinf
3472 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3473 [15421] math: lgamma wrongly sets signgam for ISO C
3474 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3475 FE_INVALID with argument out of range
3476 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3478 [15786] dynamic-link: ifunc resolver functions can smash function
3480 [15918] math: Unnecessary check for equality in hypotf()
3481 [16061] localedata: Review / update transliteration data
3482 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3484 [16141] time: strptime %z offset restriction
3485 [16171] math: drem should be alias of remainder
3486 [16296] math: fegetround is pure?
3487 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3488 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3490 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3491 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3493 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3494 "Exception "Inexact" set" on ppc32
3495 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3496 [16517] math: Missing underflow exception from tanf/tan/tanl
3497 [16519] math: Missing underflow exception from sinhf
3498 [16520] math: Missing underflow exception from tanhf
3499 [16521] math: Missing underflow exception from exp2
3500 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3502 [16734] stdio: fopen calls mmap to allocate its buffer
3503 [16961] math: nan function incorrect handling of bad sequences
3504 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3505 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3506 [16985] locale: localedef: confusing error message when opening output
3508 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3509 [17197] locale: Redundant shift character in iconv conversion output at
3511 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3512 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3513 [17250] dynamic-link: static linking breaks nss loading
3514 (getaddrinfo/getpwnam/etc...)
3515 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3517 [17441] math: isnan() should use __builtin_isnan() in GCC
3518 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3519 (related to lock elision)
3520 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3521 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3522 [17887] time: strptime should be able to parse "+01:00" style timezones
3523 [17905] libc: catopen() Multiple unbounded stack allocations
3525 [18084] libc: backtrace (..., 0) dumps core on x86
3526 [18086] libc: nice() sets errno to 0 on success
3527 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3528 is too large (CVE-2015-8778)
3529 [18251] dynamic-link: SONAME missing when audit modules provides path
3530 [18265] libc: add attributes for wchar string and memory functions
3531 [18370] math: csqrt missing underflows
3532 [18421] libc: [hppa] read-only segment has dynamic relocations
3533 [18472] libc: Obsolete syscall wrappers should be compat symbols
3534 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3535 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3536 [18525] localedata: Remove locale timezone information
3537 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3538 [18568] localedata: Update locale data to Unicode 8.0
3539 [18589] locale: sort-test.sh fails at random
3540 [18595] math: ctan, ctanh missing underflows
3541 [18604] libc: assert macro-expands its argument
3542 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3543 contains a vector instruction exception.
3544 [18611] math: j1, jn missing errno setting on underflow
3545 [18618] localedata: sync Chechen locale definitions with other *_RU
3547 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3548 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3549 [18665] network: In send_dg, the recvfrom function is NOT always using the
3550 buffer size of a newly created buffer (CVE-2015-7547)
3551 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3553 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3555 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3556 [18699] math: tilegx cproj() for various complex infinities does not yield
3558 [18724] libc: Harden put*ent functions against data injection
3559 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3560 [18755] build: build errors with -DNDEBUG
3561 [18757] stdio: fmemopen fails to set errno on failure
3562 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3564 [18781] libc: openat64 lacks O_LARGEFILE
3565 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3566 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3567 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3568 [18790] math: [ldbl-128ibm] tanhl inaccurate
3569 [18795] libc: stpncpy fortification misses buffer lengths that are
3570 statically too large
3571 [18796] build: build fails for --disable-mathvec
3572 [18803] math: hypot missing underflows
3573 [18820] stdio: fmemopen may leak memory on failure
3574 [18823] math: csqrt spurious underflows
3575 [18824] math: fma spurious underflows
3576 [18825] math: pow missing underflows
3577 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3578 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3579 [18870] build: sem_open.c fails to compile with missing symbol
3581 [18872] stdio: Fix memory leak in printf_positional
3582 [18873] libc: posix_fallocate overflow check ineffective
3583 [18875] math: Excess precision leads incorrect libm
3584 [18877] libc: arm: mmap offset regression
3585 [18887] libc: memory corruption when using getmntent on blank lines
3586 [18918] localedata: hu_HU: change time to HH:MM:SS format
3587 [18921] libc: Regression: extraneous stat() and fstat() performed by
3589 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3590 binaries (CVE-2015-8777)
3591 [18951] math: tgamma missing underflows
3592 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3594 [18953] localedata: lt_LT: change currency symbol to the euro
3595 [18956] math: powf inaccuracy
3596 [18961] math: [i386] exp missing underflows
3597 [18966] math: [i386] exp10 missing underflows
3598 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3599 [18969] build: multiple string test failures due to missing locale
3601 [18970] libc: Reference of pthread_setcancelstate in libc.a
3602 [18977] math: float / long double Bessel functions not in XSI POSIX
3603 [18980] math: i386 libm functions return with excess range and precision
3604 [18981] math: i386 scalb*, ldexp return with excess range and precision
3605 [18982] stdio: va_list and vprintf
3606 [18985] time: Passing out of range data to strftime() causes a segfault
3608 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3609 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3610 [19012] locale: iconv_open leaks memory on error path
3611 [19016] math: clog, clog10 inaccuracy
3612 [19018] nptl: Mangle function pointers in tls_dtor_list
3613 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3614 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3615 [19048] malloc: malloc: arena free list can become cyclic, increasing
3617 [19049] math: [powerpc] erfc incorrect zero sign
3618 [19050] math: [powerpc] log* incorrect zero sign
3619 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3620 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3621 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3622 [19074] network: Data race in _res_hconf_reorder_addrs
3623 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3624 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3625 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3627 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3629 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3630 [19086] manual: posix_fallocate64 documented argument order is wrong.
3631 [19088] math: lround, llround missing exceptions close to overflow
3633 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3634 [19095] math: dbl-64 lrint incorrect for 64-bit long
3635 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3636 [19124] dynamic-link: ld.so failed to build with older assmebler
3637 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3638 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3639 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3640 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3641 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3642 pthread_setaffinity_np
3643 [19156] math: [ldbl-128] j0l spurious underflows
3644 [19164] nptl: tst-getcpu fails with many possible CPUs
3645 [19168] math: math/test-ildoubl and math/test-ldouble failure
3646 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3647 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3649 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3650 (FE_NOMASK_ENV) do not clear SSE exceptions
3651 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3652 _int_new_arena/reused_arena
3653 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3654 [19201] math: dbl-64 remainder incorrect sign of zero result
3655 [19205] math: bits/math-finite.h conditions do not match math.h and
3657 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3658 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3659 for C99-based standards
3660 [19212] libc: features.h not -Wundef clean
3661 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3663 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3664 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3665 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3667 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3668 "inexact" exceptions
3669 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3671 [19242] libc: strtol incorrect in Turkish locales
3672 [19243] malloc: reused_arena can pick an arena on the free list, leading
3673 to an assertion failure and reference count corruption
3674 [19253] time: tzset() ineffective when temporary TZ did not include DST
3676 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3677 [19270] math: [hppa] Shared libm missing __isnanl
3678 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3679 MAP_HUGETLB and MAP_STACK defines
3680 [19313] nptl: Wrong __cpu_mask for x32
3681 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3682 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3683 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3684 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3685 [19363] time: x32: times() return value wrongly truncates/sign extends
3687 [19367] dynamic-link: Improve branch prediction on Silvermont
3688 [19369] network: Default domain name not reset by res_ninit when "search"
3689 / "domain" entry is removed from resolv.conf
3690 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3692 [19385] localedata: bg_BG: time separator should be colon, not comma
3693 [19408] libc: linux personality syscall wrapper may erroneously return an
3694 error on 32-bit architectures
3695 [19415] libc: dladdr returns wrong names on hppa
3696 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3697 IBM905, IBM907, and IBM909
3698 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3699 [19443] build: build failures with -DDEBUG
3700 [19451] build: Make check fails on test-double-vlen2
3701 [19462] libc: Glibc failed to build with -Os
3702 [19465] math: Wrong code with -Os
3703 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3705 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3707 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3708 [19486] math: S390: Math tests fail with "Exception Inexact set".
3709 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3710 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3712 [19590] math: Fail to build shared objects that use libmvec.so functions.
3716 * The following bugs are resolved with this release:
3718 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3719 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3720 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3721 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3722 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3723 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3724 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3725 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3726 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3727 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3728 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3729 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3730 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3731 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3732 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3733 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3734 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3735 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3736 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3737 18657, 18676, 18694, 18696, 18887.
3739 * Cache information can be queried via sysconf() function on s390 e.g. with
3740 _SC_LEVEL1_ICACHE_SIZE as argument.
3742 * A buffer overflow in gethostbyname_r and related functions performing DNS
3743 requests has been fixed. If the NSS functions were called with a
3744 misaligned buffer, the buffer length change due to pointer alignment was
3745 not taken into account. This could result in application crashes or,
3746 potentially arbitrary code execution, using crafted, but syntactically
3747 valid DNS responses. (CVE-2015-1781)
3749 * The time zone file parser has been made more robust against crafted time
3750 zone files, avoiding heap buffer overflows related to the processing of
3751 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3752 large time zone data files. Overly long time zone specifiers in the TZ
3753 variable no longer result in stack overflows and crashes.
3755 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3756 for LD and GD on x86 and x86-64, has been implemented. You will need
3757 binutils-2.24 or later to enable this optimization.
3759 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3760 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3761 Hat). These updates cause user visible changes, such as the fix for bug
3764 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3765 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3766 condition in some applications.
3768 * Added vector math library named libmvec with the following vectorized x86_64
3769 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3771 The library can be disabled with --disable-mathvec. Use of the functions is
3772 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3773 Shared library libmvec.so is linked in as needed when using -lm (no need to
3774 specify -lmvec explicitly for not static builds).
3775 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3777 * A new fmemopen implementation has been added with the goal of POSIX
3778 compliance. The new implementation fixes the following long-standing
3779 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3780 old implementation is still present for use be by existing binaries.
3782 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3783 releases. It has been fixed to match 2.19 and older, but binaries built
3784 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3786 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3787 Contributed by Roland McGrath (Google).
3789 * The header <regexp.h> is deprecated, and will be removed in a future
3790 release. Use of this header will trigger a deprecation warning.
3791 Application developers should update their code to use <regex.h> instead.
3793 This header was formerly part of SUS, but was deprecated in 1994 and
3794 removed from the standard in 2001. Also, the glibc implementation
3795 leaks memory. See BZ#18681 for more details.
3799 * The following bugs are resolved with this release:
3801 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3802 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3803 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3804 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3805 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3806 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3807 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3808 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3809 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3810 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3813 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3814 too little memory for the to-be-scanned arguments and overflow the
3815 allocated buffer. The implementation now correctly computes the required
3816 buffer size when using malloc, and switches to malloc from alloca as
3819 * A new semaphore algorithm has been implemented in generic C code for all
3820 machines. Previous custom assembly implementations of semaphore were
3821 difficult to reason about or ensure that they were safe. The new version
3822 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3823 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3824 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3826 * Port to Altera Nios II has been contributed by Mentor Graphics.
3828 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3829 implementations for powerpc64/powerpc64le.
3830 Implemented by Adhemerval Zanella (IBM).
3832 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3833 and powerpc64le. This may improve lock scaling of existing programs on
3834 HTM capable systems. The lock elision code is only enabled with
3835 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3836 powerpc will issue a transaction abort on every syscall to avoid side
3837 effects being visible outside transactions.
3839 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3840 AArch64. Contributed by ARM Ltd.
3842 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3844 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3845 under certain input conditions resulting in the execution of a shell for
3846 command substitution when the application did not request it. The
3847 implementation now checks WRDE_NOCMD immediately before executing the
3848 shell and returns the error WRDE_CMDSUB as expected.
3850 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3851 processing format strings with a large number of format specifiers.
3853 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3854 infinite loop if the DNS response contained a PTR record of an unexpected
3857 * The minimum GCC version that can be used to build this version of the GNU
3858 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3859 still be used to compile programs using the GNU C Library.
3861 * The GNU C Library is now built with -Werror by default. This can be
3862 disabled by configuring with --disable-werror.
3864 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3866 * The obsolete sigvec function has been removed. This was the original
3867 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3868 programs have been using instead for about 25 years. Of course, ABI
3869 compatibility for old binaries using sigvec remains intact.
3871 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3872 with newer versions of bison.
3874 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3875 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3876 registers overlay two consecutive single-precision registers. MIPS32R2
3877 introduced a new FPU mode (FR=1) where double-precision registers extend the
3878 corresponding single-precision registers which is incompatible with the
3879 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3880 require the use of FR=1 making a transition necessary. New o32 ABI
3881 extensions enable users to migrate over time from the original o32 ABI
3882 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3883 tracks the ABI of any loaded object and verifies that new objects are
3884 compatible. Mode transitions will also be requested as required and
3885 unsupportable objects will be rejected. The ABI checks include both soft and
3886 hard float ABIs for o32, n32 and n64.
3888 GCC 5 with GNU binutils 2.25 onwards:
3889 It is strongly recommended that all o32 system libraries are built using the
3890 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3891 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3892 compiler using --with-fp-32=xx to set this by default.
3896 * The following bugs are resolved with this release:
3898 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3899 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3900 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3901 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3902 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3903 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3904 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3905 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3906 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3907 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3908 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3909 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3910 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3911 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3912 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3914 * Reverted change of ABI data structures for s390 and s390x:
3915 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3916 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3917 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3918 are preserved pointing straight to the same implementation as the old ones.
3919 Given that, new callers will simply provide a too-big buffer to these
3920 functions. Any applications/libraries out there that embed jmp_buf or
3921 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3922 against 2.19 headers will have to rebuilt again. This is necessary in any
3923 case to revert the breakage in their ABI caused by the glibc change.
3925 * Support for file description locks is added to systems running the
3926 Linux kernel. The standard file locking interfaces are extended to
3927 operate on file descriptions, not file descriptors, via the use of
3928 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3929 are associated with an open file instead of a process.
3931 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3933 * The minimum Linux kernel version that this version of the GNU C Library
3934 can be used with is 2.6.32.
3936 * Running the testsuite no longer terminates as soon as a test fails.
3937 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3938 with PASS or FAIL lines for individual tests. A summary of the results is
3939 printed, including a list of failing lists, and "make check" exits with
3940 error status if there were any unexpected failures. "make check
3941 stop-on-test-failure=y" may be used to keep the old behavior.
3943 * The am33 port, which had not worked for several years, has been removed
3946 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3947 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3948 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3949 conflicted with POSIX (support for which was removed in 2.19), the
3950 interfaces those macros enabled remain available when compiling with
3951 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3952 test macros defined.
3954 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3956 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3957 This may improve lock scaling of existing programs on TX capable systems.
3958 The lock elision code is only built with --enable-lock-elision=yes and
3959 then requires a GCC version supporting the TX builtins. With lock elision
3960 default mutexes are elided via __builtin_tbegin, if the cpu supports
3961 transactions. By default lock elision is not enabled and the elision code
3964 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3965 copy the path argument. This allowed programs to cause posix_spawn to
3966 deference a dangling pointer, or use an unexpected pathname argument if
3967 the string was modified after the posix_spawn_file_actions_addopen
3970 * All supported architectures now use the main glibc sysdeps directory
3971 instead of some being in a separate "ports" directory (which was
3972 distributed separately before glibc 2.17).
3974 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3975 On configurations that support it (all Linux configurations), it's now
3976 used regardless of the --enable-add-ons switch to configure. It is no
3977 longer possible to build such configurations without pthreads support.
3979 * Locale names, including those obtained from environment variables (LANG
3980 and the LC_* variables), are more tightly checked for proper syntax.
3981 setlocale will now fail (with EINVAL) for locale names that are overly
3982 long, contain slashes without starting with a slash, or contain ".." path
3983 components. (CVE-2014-0475) Previously, some valid locale names were
3984 silently replaced with the "C" locale when running in AT_SECURE mode
3985 (e.g., in a SUID program). This is no longer necessary because of the
3988 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3989 with application code using Intel MPX instructions. (With all previous
3990 versions, the MPX register state could be clobbered when making calls
3991 into or out of a shared library.) Note that while the new dynamic
3992 linker is compatible with all known x86 hardware whether or not it
3993 supports Intel MPX, some x86 instruction-set emulators might fail to
3994 handle the new instruction encodings. This is known to affect Valgrind
3995 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3996 release), and might affect other tools that do instruction emulation.
3998 * Support for loadable gconv transliteration modules has been removed.
3999 The support for transliteration modules has been non-functional for
4000 over a decade, and the removal is prompted by security defects. The
4001 normal gconv conversion modules are still supported. Transliteration
4002 with //TRANSLIT is still possible, and the //IGNORE specifier
4003 continues to be supported. (CVE-2014-5119)
4005 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4006 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4007 resulting a denial-of-service security vulnerability in applications which
4008 use functions related to iconv. (CVE-2014-6040)
4012 * The following bugs are resolved with this release:
4014 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4015 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4016 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4017 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4018 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4019 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4020 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4021 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4022 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4023 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4024 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4025 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4026 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4027 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4028 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4029 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4030 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4031 16431, 16453, 16474, 16506, 16510, 16529
4033 * Slovenian translations for glibc messages have been contributed by the
4034 Translation Project's Slovenian team of translators.
4036 * The public headers no longer use __unused nor __block. This change is to
4037 support compiling programs that are derived from BSD sources and use
4038 __unused internally, and to support compiling with Clang's -fblock
4039 extension which uses __block.
4041 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4042 large collation sequences to optimize multiple passes. This cache
4043 computation may overflow for large collation sequences and may cause a
4044 stack or buffer overflow. This is now fixed to use a slower algorithm
4045 which does not use a cache if there is an integer overflow.
4047 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4048 rules for large collation sequences to optimize multiple passes and falls
4049 back to alloca if malloc fails, resulting in a possible stack overflow.
4050 The implementation now falls back to an uncached collation sequence lookup
4053 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4054 initialized for static applications resulting in the security feature
4055 being disabled. The pointer guard is now correctly initialized to a
4056 random value for static applications. Existing static applications need
4057 to be recompiled to take advantage of the fix (bug 15754).
4059 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4060 to the d_name member of struct dirent, or omit the terminating NUL
4061 character. (Bugzilla #14699).
4063 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4064 aligned_alloc functions could allocate too few bytes or corrupt the
4065 heap when passed very large allocation size values (Bugzilla #15855,
4068 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4069 for AF_INET6 has been fixed (Bugzilla #16072).
4071 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4072 pap_CW, quz_PE, the_NP.
4074 * Substantially revised locales: gd_GB, ht_HT
4076 * The LC_ADDRESS field was updated to support country_car for almost all
4079 * ISO 1427 definitions were updated.
4081 * ISO 3166 definitions were updated.
4083 * The localedef utility now supports --big-endian and --little-endian
4084 command-line options to generate locales for a different system from that
4085 for which the C library was built.
4087 * Binary locale files now only depend on the endianness of the system for
4088 which they are generated and not on other properties of that system. As a
4089 consequence, binary files generated with new localedef may be incompatible
4090 with old versions of the GNU C Library, and binary files generated with
4091 old localedef may be incompatible with this version of the GNU C Library,
4092 in the following circumstances:
4094 + Locale files may be incompatible on m68k systems.
4096 + Locale archive files (but not separate files for individual locales) may
4097 be incompatible on systems where plain "char" is signed.
4099 * The configure option --disable-versioning has been removed. Builds with
4100 --disable-versioning had not worked for several years.
4102 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4103 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4105 * SystemTap probes for malloc have been introduced.
4107 * SystemTap probes for slow multiple precision fallback paths of
4108 transcendental functions have been introduced.
4110 * Support for powerpc64le has been added.
4112 * The soft-float powerpc port now supports e500 processors.
4114 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4116 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4117 set of header declarations that are enabled by default, even when other
4118 feature test macros or compiler options such as -std=c99 would otherwise
4119 disable some of those declarations.
4121 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4122 conflict with POSIX. The libbsd-compat library (which was a dummy library
4123 that did nothing) has also been removed.
4125 * Preliminary documentation about Multi-Thread, Async-Signal and
4126 Async-Cancel Safety has been added.
4128 * Change of ABI data structures for s390 and s390x:
4129 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4130 allow for future hardware extensions. All library functions that accept or
4131 return these structures were versioned in order to provide backwards
4132 compatibility with existing code. However, not all cases can be handled
4133 with interface versioning. If an application embeds either structure into
4134 another structure and that structure is passed to another compilation unit
4135 which expects the newer larger-sized object then any access to the new
4136 fields will result in undefined behaviour. Similarly any access to fields
4137 that were moved by the enlarging of the structures will cause undefined
4138 behaviour. To fix the undefined behaviour all objects that are part of the
4139 final in-memory image must agree on the size of structures, and this may
4140 require recompilation.
4144 * The following bugs are resolved with this release:
4146 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4147 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4148 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4149 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4150 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4151 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4152 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4153 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4154 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4155 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4156 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4157 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4158 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4161 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4162 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4163 Distributions can re-enable building and using pt_chown via the new configure
4164 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4165 considerable security risks and should only be used if the distribution
4166 understands and accepts the risks.
4168 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4171 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4172 fixed (Bugzilla #15330).
4174 * Add support for calling C++11 thread_local object destructors on thread
4175 and program exit. This needs compiler support for offloading C++11
4176 destructor calls to glibc.
4178 * Improved worst case performance of libm functions with double inputs and
4181 * Support for priority inherited mutexes in pthread condition variables on
4182 non-x86 architectures.
4184 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4186 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4188 * Optimized string functions for ARM. Implemented by Will Newton and
4191 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4193 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4196 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4197 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4199 * Added a benchmark framework to track performance of functions in glibc.
4201 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4202 It is based on draft TS 18661 and currently enabled as a GNU extension.
4204 * On Linux, the clock function now uses the clock_gettime system call
4205 for improved precision, rather than old times system call.
4207 * Added support for version-3 tz format files. This is needed when using
4208 the tz database release 2013e or later, and affects a few unusual cases --
4209 currently only TZ='America/Godthab' for time stamps after 2037.
4211 * Added new API functions pthread_getattr_default_np and
4212 pthread_setattr_default_np to get and set the default pthread
4213 attributes of a process.
4215 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4216 This may improve lock scaling of existing programs on TSX capable systems.
4217 When the --enable-lock-elision=yes parameter is specified at configure
4218 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4221 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4222 availability). Implemented by Ryan S. Arnold.
4224 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4228 * The following bugs are resolved with this release:
4230 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4231 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4232 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4233 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4234 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4235 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4236 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4237 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4238 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4239 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4240 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4241 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4242 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4243 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4244 14879, 14889, 14893, 14898, 14914.
4246 * Optimization of memcpy for MIPS.
4248 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4249 EMFILE has been fixed (Bugzilla #14889).
4251 * The add-on ports collection is now distributed in the "ports" subdirectory
4252 of the main GNU C Library distribution, rather than separately.
4254 * Port to ARM AArch64 contributed by Linaro.
4256 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4257 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4259 Implemented by Andreas Krebbel.
4261 * The new function secure_getenv allows secure access to the environment,
4262 returning NULL if running in a SUID/SGID process. This function replaces
4263 the internal function __secure_getenv.
4265 * SystemTap static probes have been added into the dynamic linker.
4266 Implemented by Gary Benson.
4268 * Optimizations of string functions strstr, strcasestr and memmem.
4269 Implemented by Maxim Kuvyrkov.
4271 * The minimum Linux kernel version that this version of the GNU C Library
4272 can be used with is 2.6.16.
4274 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4275 powerpc POWER7. Implemented by Will Schmidt.
4277 * New configure option --disable-nscd builds the C library such that it
4278 never attempts to contact the Name Service Caching Daemon (nscd).
4279 New configure option --disable-build-nscd avoids building nscd itself;
4280 this is the default if --disable-nscd is used.
4282 * Improved support for cross-compilation, including cross-testing and
4283 bootstrap builds without a previously built glibc.
4285 * Several testsuite tests are now able to test multiple IFUNC variants of an
4286 interface, rather than just testing the one that would be chooen by
4289 * New configure options --with-bugurl and --with-pkgversion, for
4290 distributors to use to embed their bug-reporting and package version
4291 information in --help and --version output.
4293 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4294 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4295 allows creation of chroots without the procfs mounted on /proc.
4297 * The `crypt' function now fails if passed salt bytes that violate the
4298 specification for those values. On Linux, the `crypt' function will
4299 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4300 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4301 when the mode is enabled.
4303 * The `clock_*' suite of functions (declared in <time.h>) is now available
4304 directly in the main C library. Previously it was necessary to link with
4305 -lrt to use these functions. This change has the effect that a
4306 single-threaded program that uses a function such as `clock_gettime' (and
4307 is not linked with -lrt) will no longer implicitly load the pthreads
4308 library at runtime and so will not suffer the overheads associated with
4309 multi-thread support in other code such as the C++ runtime library.
4311 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4316 * The following bugs are resolved with this release:
4318 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4319 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4320 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4321 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4322 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4323 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4324 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4325 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4326 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4327 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4328 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4329 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4330 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4331 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4332 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4333 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4334 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4335 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4336 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4337 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4338 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4339 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4342 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4343 configuring glibc with:
4344 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4345 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4346 Implemented by H.J. Lu.
4350 + define static_assert
4352 + do not declare gets
4354 + declare at_quick_exit and quick_exit also for ISO C11
4356 + aligned_alloc. NB: The code is deliberately allows the size parameter
4357 to not be a multiple of the alignment. This is a moronic requirement
4358 in the standard but it is only a requirement on the caller, not the
4361 + timespec_get added
4363 + uchar.h support added
4365 + CMPLX, CMPLXF, CMPLXL added
4367 Implemented by Ulrich Drepper.
4369 * Support for the IA-64 has been moved to ports.
4371 * Remove support for anything but ELF binary format
4373 * Checking versions of poll, ppoll added.
4374 Implemented by Ulrich Drepper.
4376 * More generic and 64-bit performance optimizations to math functions.
4377 Implemented by Ulrich Drepper.
4379 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4380 headers and functions available at compile time as they were before
4381 version 2.14. This option will be removed at some time in the future
4382 after the TI-RPC library becomes fully sufficient for the needs of
4383 existing applications.
4385 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4386 Note that glibc is not expected to work with any Linux kernel version
4389 * New header <sys/auxv.h> and function getauxval allowing easy access to
4390 the AT_* key-value pairs passed from the Linux kernel. The header also
4391 defines the HWCAP_* bits associated with the AT_HWCAP key.
4393 * New locales: mag_IN
4395 * New configure option --enable-systemtap builds SystemTap static probes
4396 into libc for setjmp and longjmp and into libpthread for various operations.
4397 So far the setjmp/longjmp probes and some of the libpthread probes are
4398 provided only for i*86 and x86_64.
4399 Implemented by Roland McGrath and Rayson Ho.
4401 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4403 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4406 * More optimized functions for SPARC. Implemented by David S. Miller.
4408 * Improved support for cross-compilation, especially bootstrap builds
4409 without a previously built glibc.
4411 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4412 Chris Metcalf from Tilera.
4414 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4415 now supported for ARM processors.
4417 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4418 as the name of the dynamic linker, to distinguish it from the
4419 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4421 * Support for CRIS has been removed from ports.
4423 * A new class of installed header has been documented for low-level
4424 platform-specific functionality. PowerPC added the first instance with a
4425 function to provide time base register access. Contributed by Tulio
4426 Magno Quites Machado Filho.
4428 * ix86 configurations now install header files that are consistent with
4429 what x86-64 configurations install. These same header files can be used
4430 for -m32, -m64, or -mx32 builds.
4431 Contributed by H.J. Lu.
4433 * Math library bug fixes. A thorough audit of all open math library bugs was
4434 conducted by Joseph Myers. Significant progress was made on many math
4435 library bugs resulting in more accurate exceptions and function results.
4436 Many thanks to all those that contributed including Andreas Jaeger for his
4437 patch review and work on the x87 trigonometric instruction issues.
4439 * Timezone data is no longer installed. Timezone-related binaries and scripts
4440 will continue to be installed. Users should obtain their timezone data from
4441 their distribution provider or from the tzdata package at
4442 <ftp://munnari.oz.au/pub/>.
4446 * The following bugs are resolved with this release:
4448 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4449 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4450 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4451 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4452 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4453 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4454 13484, 13506, 13515, 13523, 13524, 13538, 13540
4456 * New program pldd to list loaded object of a process
4457 Implemented by Ulrich Drepper.
4459 * Add nss_db support back to glibc. No more dependency on Berkeley db
4460 and support for initgroups lookups.
4461 Implemented by Ulrich Drepper.
4463 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4464 Contributed by HJ Lu.
4466 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4467 Contributed by HJ Lu.
4469 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4470 on x86-32 and x86-64.
4471 Contributed by Liubov Dmitrieva.
4473 * Optimized strchr and strrchr for SSE on x86-32.
4474 Contributed by Liubov Dmitrieva.
4476 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4477 for x86-64 and x86-32.
4478 Contributed by Liubov Dmitrieva.
4480 * New interfaces: scandirat, scandirat64
4481 Implemented by Ulrich Drepper.
4483 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4484 Implemented by Ulrich Drepper.
4486 * nscd now also caches the netgroup database.
4487 Implemented by Ulrich Drepper.
4489 * Integrate libm with gcc's -ffinite-math-only option.
4490 Implemented by Ulrich Drepper.
4492 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4493 to math functions. Implemented by Ulrich Drepper.
4495 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4496 Implemented by Ulrich Drepper.
4498 * New Linux interfaces: process_vm_readv, process_vm_writev
4500 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4501 Implemented by Ulrich Drepper.
4503 * Optimized nearbyint and strcasecmp for PPC.
4504 Implemented by Adhemerval Zanella.
4506 * New locales: bho_IN, unm_US, es_CU, ta_LK
4510 * The following bugs are resolved with this release:
4512 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4513 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4514 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4515 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4516 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4517 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4518 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4519 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4520 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4521 12795, 12811, 12813, 12814, 12841
4523 * The RPC implementation in libc is obsoleted. Old programs keep working
4524 but new programs cannot be linked with the routines in libc anymore.
4525 Programs in need of RPC functionality must be linked against TI-RPC.
4526 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4528 Visible changes of this change include (obviously) the inability to link
4529 programs using RPC functions without referencing the TI-RPC library and the
4530 removal of the RPC headers from the glibc headers.
4531 Implemented by Ulrich Drepper.
4533 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4534 syncfs, setns, sendmmsg
4536 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4537 yue_HK, lij_IT, mhr_RU
4539 * New encodings: CP770, CP771, CP772, CP773, CP774
4541 * New program sotruss to trace calls through PLTs
4542 Implemented by Ulrich Drepper.
4544 * The malloc hook implementation is marked deprecated and will be removed
4545 from the default implementation in the next version. The design never
4546 worked ever since the introduction of threads. Even programs which do
4547 not create threads themselves can use multiple threads created internally.
4551 * The following bugs are resolved with this release:
4553 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4554 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4555 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4556 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4559 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4561 * POWER7 optimizations: memset, memcmp, strncmp
4563 * New optimized string functions for x86-64: strnlen (SSE2),
4564 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4565 Implemented by Ulrich Drepper.
4569 * The following bugs are resolved with this release:
4571 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4572 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4573 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4574 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4575 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4576 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4577 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4578 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4580 * New interfaces: pthread_getname_np, pthread_setname_np
4582 * New Linux interface: recvmmsg
4584 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4586 * The dynamic linker now recognizes supported ABI versions from the
4587 EI_ABIVERSION field in the ELF header.
4588 Implemented by Ulrich Drepper.
4590 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4591 will not be used to fill in password fields in the passwd.byname replies.
4592 Instead it is used to synthesize the shadow.byname table, should it be
4593 missing. This is a useful mode in some installations involving Solaris.
4594 Implemented by Ulrich Drepper.
4596 * New locales: kok_IN, sq_MK, cv_RU
4600 * The following bugs are resolved with this release:
4602 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4603 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4604 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4605 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4606 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4607 10789, 10817, 10823, 10840, 10847
4609 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4611 Implemented by Ulrich Drepper.
4613 * Checking version of longjmp added that fails if an uninitialized stack
4614 frame would be created. Implemented by Ulrich Drepper.
4616 * STT_GNU_IFUNC is now supported in static executables.
4617 Implemented by H.J. Lu.
4619 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4621 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4622 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4623 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4624 Contributed by H.J. Lu.
4626 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4627 Implemented by Ulrich Drepper.
4629 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4631 Contributed by H.J. Lu.
4633 * Support for fma instruction in AVX on x86-64.
4634 Implemented by H.J. Lu and Ulrich Drepper.
4636 * AVX support in x86-64 auditing support in ld.so.
4637 Implemented by H.J. Lu.
4639 * STB_GNU_UNIQUE support added.
4640 Implemented by Ulrich Drepper.
4642 * Implement second fallback mode for optimized DNS lookup for even more
4643 broken environments. If two requests from the same port are not
4644 handled correctly close the socket and open a new one before sending
4645 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4646 can be used to select this mode right away, instead of rediscovering the
4647 necessity is every process again.
4648 Implemented by Ulrich Drepper.
4650 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4651 Implemented by Adam Tkac.
4653 * Optimized iconv conversions for S390x.
4654 Implemented by Andreas Krebbel.
4656 * Using condvars with PI mutexes is now more efficient due to kernel
4657 support for requeueing to PI futexes. NPTL support added for x86-64.
4658 Implemented by Ulrich Drepper.
4660 * New locales: ps_AF, my_MM
4664 * The following bugs are resolved with this release:
4666 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4667 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4668 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4669 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4670 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4672 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4673 Implemented by Ulrich Drepper.
4675 * New Linux interfaces: accept4, fallocate, fallocate64.
4676 Implemented by Ulrich Drepper.
4678 * Correct declarations of string function when used in C++ code. This
4679 could lead to compile errors for invalid C++ code.
4681 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4684 * New POSIX 2008 interface: psiginfo
4685 Implemented by Ulrich Drepper.
4687 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4688 Implemented by Ulrich Drepper.
4690 * Support for selecting between multiple function definitions at runtime
4691 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4693 * The libcrypt library can now use the hash function implementations in
4694 NSS. Implemented by Ulrich Drepper.
4696 * The malloc implementation can be compiled to be less memory efficient
4697 but higher performing in multi-threaded programs.
4698 Implemented by Ulrich Drepper.
4700 * New locales: nan_TW@latin, ks_IN
4702 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4703 Implemented by Ulrich Drepper.
4705 * Extended printf hook support. It is possible to use user-defined types
4706 and extend existing format specifiers.
4707 Implemented by Ulrich Drepper.
4709 * Handling for group shadow files has been added.
4710 Implemented by Ulrich Drepper.
4712 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4713 servers (the case, e.g., for some people using the built-in DNS
4714 server in ADSL modems/routers). There is a once-per-process timeout
4715 in case of a broken server. To avoid it, users can run nscd or put
4716 'options single-request' in /etc/resolv.conf.
4717 Implemented by Ulrich Drepper.
4721 * The following bugs are resolved with this release:
4723 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
4724 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
4725 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
4726 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
4727 6968, 6974, 6980, 6995, 7008, 7009, 7029
4729 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4730 up at the same time. Implemented by Ulrich Drepper.
4732 * TLS descriptors for LD and GD on x86 and x86-64.
4733 Implemented by Alexandre Oliva.
4735 * getaddrinfo now handles DCCP and UDPlite.
4736 Implemented by Ulrich Drepper.
4738 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4739 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4740 Implemented by Ulrich Drepper.
4742 * New implementation of memmem, strstr, and strcasestr which is O(n).
4743 Implemented by Eric Blake.
4745 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4747 * Implement "e" option for popen to open file descriptor with the
4748 close-on-exec flag set. Implemented by Ulrich Drepper.
4750 * Implement "b" mode for fmemopen. In this mode writes writes don't
4751 implicitly add a NUL byte and seeks from the end of the buffer really
4752 use the buffer end, not the string length as the basis.
4753 Implemented by Ulrich Drepper.
4755 * Many functions, exported and internal, now atomically set the close-on-exec
4756 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4758 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4760 Implemented by Pravin Satpute.
4762 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4766 * The following bugs are resolved with this release:
4768 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4769 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4770 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4771 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4772 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4773 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4774 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4776 * New locales: bo_CN, bo_IN, shs_CA.
4778 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4780 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4781 Implemented by Pravin Satpute.
4783 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4785 * nscd caches now all timeouts for DNS entries
4786 Implemented by Ulrich Drepper.
4788 * nscd is more efficient and wakes up less often.
4789 Implemented by Ulrich Drepper.
4791 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4792 vdprintf, and obstack_vprintf.
4793 Implemented by Jakub Jelinek.
4795 * Faster memset for x86-64.
4796 Implemented by Harsha Jagasia and H.J. Lu.
4798 * Faster memcpy on x86.
4799 Implemented by Ulrich Drepper.
4801 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4802 Implemented by Ulrich Drepper.
4804 * Faster sqrt and sqrtf implemention for some PPC variants.
4805 Implemented by Steven Munroe.
4809 * The following bugs are resolved with this release:
4811 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4812 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4813 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4814 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4815 5071, 5103, 5104, 5112, 5113, 5184, 5186
4817 * More checking functions: fread, fread_unlocked, open*, mq_open.
4818 Implemented by Jakub Jelinek and Ulrich Drepper.
4820 * Extend fortification to C++. Implemented by Jakub Jelinek.
4822 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4823 by not recognizing 'a' as a modifier when those specs are requested.
4824 Implemented by Jakub Jelinek.
4826 * PPC optimizations to math and string functions.
4827 Implemented by Steven Munroe.
4829 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4830 options to be passed. Implemented by Ulrich Drepper.
4832 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4834 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4835 Implemented by Ulrich Drepper.
4837 * Handle private futexes in the NPTL implementation.
4838 Implemented by Jakub Jelinek and Ulrich Drepper.
4840 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4841 Implemented by Roland McGrath and Ulrich Drepper.
4843 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4845 * SHA-256 and SHA-512 based password encryption.
4846 Implemented by Ulrich Drepper.
4848 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4849 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4852 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4853 Implemented by Ulrich Drepper.
4857 * The following bugs are resolved with this release:
4859 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4860 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4861 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4862 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4863 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4864 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4865 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4868 * New Linux interfaces: epoll_pwait, sched_getcpu.
4870 * New generic interfaces: strerror_l.
4872 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4876 * The following bugs are resolved with this release:
4878 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4879 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4880 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4881 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4882 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4883 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4884 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4885 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4886 3225, 3251, 3252, 3253, 3273
4888 * For Linux, the sorting of addresses returned by getaddrinfo now also
4889 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4890 Implemented by Ulrich Drepper.
4892 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4893 Implemented by Ulrich Drepper.
4895 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4897 * New iconv module for MIK. Contributed by Alexander Shopov.
4899 * For sites with broken group and/or passwd database, the auto-propagate
4900 option of nscd can prevent creating ID lookup entries from the results
4901 of a name lookup and vice versa. This usually is no problem but some
4902 site might have problems with the default behavior.
4903 Implemented by Ulrich Drepper.
4905 * Iterating over entire database in NIS can be slow. With the
4906 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4907 to trade time for memory. The entire database will be read at once.
4908 Implemented by Ulrich Drepper.
4910 * The interfaces introduced in RFC 3542 have been implemented by
4913 * Support for the new ELF hash table format was added by Ulrich Drepper.
4915 * Support for priority inheritance mutexes added by Jakub Jelinek and
4918 * Support for priority protected mutexes added by Jakub Jelinek.
4920 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4921 or_IN, csb_PL, fy_NL, sr_ME.
4925 * More overflow detection functions.
4927 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4928 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4930 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4931 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4932 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4933 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4934 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4935 by Masahide Washizawa.
4937 * It is now possible to install audit libraries for the dynamic linker using
4938 LD_AUDIT. Implemented by Ulrich Drepper.
4940 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4941 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4942 For a libc and libpthread that works well on Linux 2.4 kernels, we
4943 recommend using the stable 2.3 branch.
4945 * The new function open_wmemstream acts like open_memstream,
4946 but uses a wchar_t wide character buffer.
4948 * The new function ppoll is an improved version of poll, similar to pselect.
4950 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4951 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4952 renameat, unlinkat, linkat, symlinkat, readlinkat.
4954 * New Linux kernel system calls: unshare,
4955 inotify_init, inotify_add_watch, inotify_rm_watch.
4957 * The euidaccess function is now also known by the alias eaccess,
4958 for compatibility with some other systems.
4960 * Timezone data updated to 2006b version.
4964 * The following bugs are resolved with this release:
4966 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4967 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4968 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4969 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4970 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4971 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4973 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4975 * As of this release, GCC 4 can be used to compile the C Library.
4977 * Timezone data updated to 2005m version.
4981 * The following bugs are resolved with this release:
4983 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4984 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4985 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4986 777, 787, 821, 822, 823, 825
4988 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4992 * Support for RFC 3678. Real implementations exist only for Linux so far.
4993 Implemented by Ulrich Drepper.
4995 * nscd can now cache entries persistently. Expiring entries are reloaded.
4996 For speedups the cache can be shared in memory with client processes.
4997 Implemented by Ulrich Drepper.
4999 * nscd can now perform SELinux checks.
5000 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5002 * getaddrinfo queries are now cached. Canonical name lookup is performed
5004 Implemented by Ulrich Drepper.
5006 * The nothrow function attribute is used when headers are used by gcc when
5007 compiling C code. This can avoid significant amounts of exception
5010 * The malloc functions perform more error checking and are stricter when
5011 it comes to reacting on errors. The default action is to terminate
5012 the process after showing an error message. Implemented by Ulrich Drepper.
5014 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5015 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5017 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5018 namespaces using the new function dlmopen(). This feature is of course,
5019 like most other dynamic loading functionality, not available in statically
5020 linked applications. Implemented by Ulrich Drepper.
5022 * Low-overhead boundary checking variants of string and some stdio functions
5023 were added. These are to be used in conjunction with a gcc patch by
5024 Jakub Jelinek which adds calls to these functions if possible.
5025 Implemented by Jakub Jelinek and Ulrich Drepper.
5027 * Old code for several operating systems and machine architectures that
5028 have not been in working condition in a long time have been removed from
5029 the main source tree maintained by the GNU C Library's maintainers.
5030 These files are now reside in the separate `ports' source module
5031 that is usable as an add-on when building the library.
5035 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5036 interrogate the dynamic linker, compatible with the Solaris interface.
5038 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5039 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5041 * getifaddrs now uses the netlink interface on Linux to get its information.
5042 Implemented by Thorsten Kukuk.
5044 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5045 Implemented by Ulrich Drepper.
5047 * support for non-executable stacks on x86 has been added. Changes mostly
5050 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5053 * getaddrinfo now performs destination address selection according to
5058 * Thread-safe interfaces for many functions that access locale data
5059 were added in version 2.3, but these features were omitted from NEWS.
5060 Many functions have variants with an `_l' suffix that take a `locale_t'
5061 object as a parameter rather than consulting the current locale.
5062 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5063 create and maintain `locale_t' objects. Additionally, the new function
5064 `uselocale' sets "the current locale" (as used by functions not so
5065 parameterized) set for an individual thread. These features were added
5066 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5068 * The functions getresuid, getresgid, setresuid, and setresgid, which
5069 have long been available on Linux, are now declared in <unistd.h>
5070 and are now also available on the Hurd.
5072 * ELF thread-local storage support (TLS) now works on x86-64.
5074 * The new dynamic string token $LIB is expanded in shared library names.
5075 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5077 * Aldy Hernandez contributed complete software floating point support for
5078 PowerPC machines with no FPU.
5080 * fexecve is implemented on Linux.
5082 * The `btowc' function should work at least twice as fast due to
5083 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5085 * With approriate thread add-ons cancelable functions are now implemented
5086 in libc.so as well. No need to call the function in libpthread. This
5087 change allowed to finally disable the incorrect and expensive handling
5088 of weak definition in ld.so.
5090 * Yet more PLT entries in libc.so have been removed. We finally arrived
5091 at the bare minimum. Startup times improved appropriately.
5093 * Support for the new Linux/x86 system call interface was added. The
5094 AT_SYSINFO auxiliary vector entry is recognized and handled.
5098 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5101 * iconv (the program and the interface) now accepts empty names (excluding
5102 options like //TRANSLIT) to mean "use charset of current locale".
5104 * localedef can now transliterate characters in strings which are not in
5105 the provided charmap. The information from the input locale is used.
5107 * Prelinking support was added for ELF targets. This requires additional
5108 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5110 * Read-only stdio streams now use mmap to speed up operation by eliminating
5111 copying and buffer underflows. To use add 'm' to the mode string of
5112 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5114 * The malloc functions were completely rewritten by Wolfram Gloger based
5115 on Doug Lea's malloc-2.7.0.c.
5117 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5118 implementation of regex.
5120 * Bruno Haible upgraded the iconv and locale implementation to support
5123 * Contents of the LC_* and LANG environment variables in the CEN style are
5124 not recognized anymore. It never was used. Change by Ulrich Drepper.
5126 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5127 thread-local storage (TLS) ABI on some platforms.
5128 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5130 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5131 EUC-JISX0213, and TSCII.
5133 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5134 BSD-compatible interface for getting all network interface addresses.
5135 Implementation for IPv4 by Roland McGrath.
5137 * Loading of locale data is faster due to the introduction of a locale
5138 archive. Implemented by Roland McGrath and Ulrich Drepper.
5140 * Startup times are significantly reduced by not using exported functions
5141 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5144 * Steven Munroe contributed a port to PowerPC64/Linux.
5148 * The Hurd now uses the GNU libio implementation of stdio rather than the
5149 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5151 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5152 with the same behavior as the Linux system call of the same name.
5156 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5157 128-bit long double format.
5159 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5160 IBM1161, and IBM1162 charsets.
5162 * Andreas Jaeger contributed a port to x86-64/Linux.
5164 * Peter Bruin contributed a port to PowerPC/Hurd.
5166 * libc functions using I/O streams now can handle wide-oriented streams
5169 * optimizations in the dynamic linker. Binaries created by recent binutils
5170 versions start up quicker due to reduced time spent on relocations.
5172 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5176 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5177 asinh, atanh, j0 for the 128-bit long double format.
5179 * Bruno Haible updated all the code handling Unicode in some form to
5180 support Unicode 3.1.
5182 * Speed of regex for single-byte locales is back to previous levels.
5183 Patch by Isamu Hasegawa.
5185 * Alpha, SPARC, and IA-64 now also using floating stacks.
5187 * Startup time of internationalized applications greatly improved through
5188 iconv cache. Use iconvconfig to generate the cache file.
5189 Contributed by Ulrich Drepper.
5191 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5192 severe performance problems. Patch by David Mosberger.
5194 * The Hurd port got a lot more functionality like AIO, various stdio
5195 extensions, etc. Mainly done by Roland McGrath.
5197 * mtrace can now lookup symbols in shared libraries.
5201 * Intel's IA-64 math library is largely integrated. It provides fast and
5202 accurate implementatations for most basic and standard math functions
5203 in float, double, and long double format.
5205 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5206 and asin for the 96-bit long double format and asin, log, tan for the
5207 128-bit long double format.
5209 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5210 The basic double functions exist today. Contributed by Abraham Ziv
5211 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5212 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5214 * An asynchronous name lookup library was added. The interface is designed
5215 after POSIX AIO. The proposal was circulated beforehand to get comments.
5216 No negative ones came in. Implemented by Ulrich Drepper.
5218 * Port to S390/64bit contributed by Martin Schwidefsky
5219 <schwidefsky@de.ibm.com>.
5221 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5222 of functions for Linux/IA-64.
5224 * The RPC code is now thread safe. Threads can now use the same service
5225 of different services at the same time. Patch by Eric Norum
5226 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5228 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5229 family of functions for Linux/S390.
5231 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5232 of functions for Linux/x86.
5234 * Port to Linux/CRIS contributed by Axis Communications.
5238 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5239 we can now check for namespace violations and missing declarations. The
5240 result is that almost all headers are now Unix-compliant (as defined in
5241 the upcoming XPG6). The negative side is that some programs might need
5242 corrections, too, if they depend on the incorrect form of the headers in
5243 previous versions which defined too many symbols and included too many
5246 * regex now handles multibyte character sets correctly.
5247 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5249 * iconv (the program) does now conform to the upcoming XPG6 and handles
5250 charmaps. Instead of the charset names the path of charmaps can be
5251 provided and the conversion happens based on this data.
5252 Contributed by Ulrich Drepper.
5254 * The locale program now provides detailed information about the installed
5259 only lists the names of the supported locales
5263 provides details such as country, language, and codeset name.
5264 Contributed by Ulrich Drepper.
5268 * The gencat program now parses the input file according to the charset
5269 selected by the LC_CTYPE category. This is important for stateful
5270 character sets. To make generating catalogs easier there is a way
5271 to overwrite the charset selected by the locale: before the first
5272 message or $ quote line the catalog can contain a line like
5274 $ codeset=ISO-8859-2
5276 to select the charset (ISO-8859-2 in this case).
5278 Implemented by Shinya Hanataka and Ulrich Drepper.
5280 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5281 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5282 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5284 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5285 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5287 * The LANGUAGE environment variable is now ignored unless the locale is
5288 changed from the default "C" locale.
5290 * The usual bug fixes.
5294 * Greg McGary added runtime support for bounds checking using gcc's
5295 new -fbounded-pointers option. ix86 target is complete. PowerPC
5298 * Thorsten Kukuk added secure mode support to nscd.
5300 * The Berkeley db libraries have been removed.
5302 Related, the nss_db module is now in a separate package since it
5303 obviously requires a database library being available.
5305 * Wide character I/O streams implemented by Ulrich Drepper.
5307 * Functions from the extended socket API added by Ulrich Drepper.
5309 * Functions feenableexcept and fedisableexcept to control the
5310 behaviour of individual exceptions have been added by Andreas Jaeger.
5312 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5314 * The resolver code has been updated from bind 8.2.3-T5B which supports
5315 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5318 This change could in some situations effect backward compatibility. Since
5319 now `_res' is a thread-local instead of a global variable, modifying it
5320 in one thread does not have any effect in other threads.
5322 The resolver library was also extended to allow IPv6 as the transport
5323 protocol for the requests. This work was done by Stig Venaas.
5325 * Compatibility code for K&R C compilers has been removed from the
5326 header files. A ISO C compiler is needed to use the library
5327 (conforming to either C89 or C99 standard).
5329 * Complete rewrite of the localedef program to support multibyte character
5330 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5331 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5332 Implemented by Ulrich Drepper.
5334 Bruno Haible significantly improved the generation and use of the data
5335 structures for the wide character tables.
5337 * Plural handling in gettext implemented by Ulrich Drepper.
5339 * The utmp daemon has been removed.
5341 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5343 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5346 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5348 * POSIX barriers implemented by Kaz Kylheku.
5350 * POSIX spawn function family implemented by Ulrich Drepper.
5352 * POSIX spinlocks are now available.
5354 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5356 * the configure option --enable-kernel=X.Y.Z allows to strip out
5357 compatibility for kernel versions before X.Y.Z. This is currently only
5358 implemented for Linux.
5360 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5361 field sin6_scope_id. This means that all programs using IPv6 should be
5362 recompiled. Don't expect binary compatibility with previous glibc
5365 * various conversion modules for IBM character sets contributed by
5368 * IA-64 port by Jes Sorensen and HJ Lu.
5382 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5384 * New xdr functions are added; some rpc functions are now 64bit clean.
5386 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5388 * Fixed known incompatibilities with glibc 2.0.
5390 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5392 * Optimized a number of functions (especially the ELF dynamic loader).
5394 * Update timezone data files.
5396 * lots of charmaps corrections
5398 * some new locale definitions and charmaps
5403 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5404 conform to POSIX member type requirements. Symbol versions have been
5405 adjusted as needed within the library, and for direct use by applications,
5406 but there is potential for problems if third-party libraries use
5407 struct timeval as part of their interface. This does not present
5408 a problem for X and other "essential" system libraries.
5410 * An additional locale model to support C++ Standard Library locale
5411 model and probably more was implemented by Ulrich Drepper.
5413 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5416 * Miles Bader provided the `argp' function family to support hierachical
5417 command line argument parsing, layered on top of getopt.
5419 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5421 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5424 * scanf recognizes the %a and %A format for scanning floating point numbers.
5426 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5427 information and interfaces for the available integer types.
5429 * about 130 new math functions were added to implement the ISO C9x math
5432 * the new header <complex.h> contains definitions of the complex math
5433 functions from ISO C 9X.
5435 * the new header <tgmath.h> defines generic macros to use complex or
5436 real valued functions.
5438 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5440 * Andreas Jaeger provided a test suite for the math library.
5442 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5444 * Ulrich Drepper added character set conversion functions (iconv).
5446 * Optimized string functions have been added.
5448 * The localedata addon is now part of glibc.
5450 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5452 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5453 daemon for NSS (nscd).
5455 Missing a better place here are some numbers on improvements. Under
5456 Linux 2.1.125 un-tar-ing the kernel sources takes
5460 using local files 12.19s 6.88s 22.91s
5462 using NIS 13.92s 8.91s 26.34s
5464 using NIS & nscd 10.37s 7.34s 25.30s
5466 using NIS+ 27.57s 30.37s 640.46s
5468 using NIS+ & nscd 10.25s 7.83s 26.51s
5470 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5472 Keep in mind that non-namelookup related operations dominate above times.
5473 It was just a common complain that using NIS+ unpacking the kernel is
5476 [1] The old nscd implementation is not available anymore since it was
5477 distributed with glibc up to version 2.0.98 and thus is now replaced.
5479 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5481 * Mark Kettenis provided a Hesiod NSS module.
5483 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5484 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5486 * rcmd can now handle netgroups (Dick Streefland).
5488 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5491 * Support for the IPv6 protocol has been added to the socket API, as per the
5492 latest draft standards.
5494 * Support for Linux 2.2 has been added.
5496 * Interface changes relative to the latest 2.0.x release:
5497 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5498 addseverity NEW: Unix98
5499 alphasort64 NEW: LFS
5500 argp_err_exit_status NEW: argp, GNU ext
5501 argp_error NEW: argp, GNU ext
5502 argp_failure NEW: argp, GNU ext
5503 argp_help NEW: argp, GNU ext
5504 argp_parse NEW: argp, GNU ext
5505 argp_program_bug_address NEW: argp, GNU ext
5506 argp_program_version NEW: argp, GNU ext
5507 argp_program_version_hook NEW: argp, GNU ext
5508 argp_state_help NEW: argp, GNU ext
5509 argp_usage NEW: argp, GNU ext
5510 authdes_create NEW: Secure RPC
5511 authdes_getucred NEW: Secure RPC
5512 authdes_pk_create NEW: Secure RPC
5513 backtrace NEW: GNU ext.
5514 backtrace_symbols NEW: GNU ext.
5515 backtrace_symbols_fd NEW: GNU ext.
5517 cacosf NEW: ISO C 9x
5518 cacosh NEW: ISO C 9x
5519 cacoshf NEW: ISO C 9x
5520 cacoshl NEW: ISO C 9x
5521 cacosl NEW: ISO C 9x
5528 casinf NEW: ISO C 9x
5529 casinh NEW: ISO C 9x
5530 casinhf NEW: ISO C 9x
5531 casinhl NEW: ISO C 9x
5532 casinl NEW: ISO C 9x
5534 catanf NEW: ISO C 9x
5535 catanh NEW: ISO C 9x
5536 catanhf NEW: ISO C 9x
5537 catanhl NEW: ISO C 9x
5538 catanl NEW: ISO C 9x
5539 cbc_crypt NEW: Secure RPC
5543 ccoshf NEW: ISO C 9x
5544 ccoshl NEW: ISO C 9x
5550 cimagf NEW: ISO C 9x
5551 cimagl NEW: ISO C 9x
5552 clearerr_locked REMOVED
5553 clntunix_create NEW: sunrpc ext
5555 clog10 NEW: ISO C 9x
5556 clog10f NEW: ISO C 9x
5557 clog10l NEW: ISO C 9x
5567 cprojf NEW: ISO C 9x
5568 cprojl NEW: ISO C 9x
5570 crealf NEW: ISO C 9x
5571 creall NEW: ISO C 9x
5576 csinhf NEW: ISO C 9x
5577 csinhl NEW: ISO C 9x
5580 csqrtf NEW: ISO C 9x
5581 csqrtl NEW: ISO C 9x
5585 ctanhf NEW: ISO C 9x
5586 ctanhl NEW: ISO C 9x
5588 des_setparity NEW: Secure RPC
5589 ecb_crypt NEW: Secure RPC
5590 endutxent NEW: Unix98
5592 exp10f NEW: ISO C 9x
5593 exp10l NEW: ISO C 9x
5597 fattach NEW: STREAMS
5598 fdetach NEW: STREAMS
5602 feclearexcept NEW: ISO C 9x
5603 fegetenv NEW: ISO C 9x
5604 fegetexceptflag NEW: ISO C 9x
5605 fegetround NEW: ISO C 9x
5606 feholdexcept NEW: ISO C 9x
5608 feraiseexcept NEW: ISO C 9x
5609 ferror_locked REMOVED
5610 fesetenv NEW: ISO C 9x
5611 fesetexceptflag NEW: ISO C 9x
5612 fesetround NEW: ISO C 9x
5613 fetestexcept NEW: ISO C 9x
5614 feupdateenv NEW: ISO C 9x
5615 fflush_locked REMOVED
5619 fgets_unlocked NEW: GNU ext.
5620 fileno_locked REMOVED
5632 fputc_locked REMOVED
5633 fputs_unlocked NEW: GNU ext.
5634 fread_unlocked NEW: GNU ext.
5639 fstatvfs NEW: Unix98
5643 ftruncate64 NEW: LFS
5645 fwrite_unlocked NEW: GNU ext.
5646 gai_strerror NEW: IPv6
5650 getchar_locked REMOVED
5652 getdate_err NEW: Unix98
5653 getdate_r NEW: GNU ext.
5655 getnameinfo NEW: IPv6
5656 getnetname NEW: Secure RPC
5657 getpmsg NEW: STREAMS
5658 getpt NEW: Unix98 PTY
5659 getrlimit64 NEW: LFS
5660 getutxent NEW: Unix98
5661 getutxid NEW: Unix98
5662 getutxline NEW: Unix98
5663 glob64 NEW: GNU ext.
5664 globfree64 NEW: GNU ext.
5665 gnu_get_libc_release NEW: GNU ext.
5666 gnu_get_libc_version NEW: GNU ext.
5667 grantpt NEW: Unix98 PTY
5668 host2netname NEW: Secure RPC
5670 iconv_close NEW: iconv
5671 iconv_open NEW: iconv
5672 if_freenameindex NEW: IPv6
5673 if_indextoname NEW: IPv6
5674 if_nameindex NEW: IPv6
5675 if_nametoindex NEW: IPv6
5676 in6addr_any NEW: IPv6
5677 in6addr_loopback NEW: IPv6
5678 inet6_isipv4mapped NEW: IPv6
5679 isastream NEW: STREAMS
5680 iswblank NEW: GNU ext.
5681 key_decryptsession NEW: Secure RPC
5682 key_decryptsession_pk NEW: Secure RPC
5683 key_encryptsession NEW: Secure RPC
5684 key_encryptsession_pk NEW: Secure RPC
5685 key_gendes NEW: Secure RPC
5686 key_get_conv NEW: Secure RPC
5687 key_secretkey_is_set NEW: Secure RPC
5688 key_setnet NEW: Secure RPC
5689 key_setsecret NEW: Secure RPC
5690 llrint NEW: ISO C 9x
5691 llrintf NEW: ISO C 9x
5692 llrintl NEW: ISO C 9x
5693 llround NEW: ISO C 9x
5694 llroundf NEW: ISO C 9x
5695 llroundl NEW: ISO C 9x
5700 lrintf NEW: ISO C 9x
5701 lrintl NEW: ISO C 9x
5702 lround NEW: ISO C 9x
5703 lroundf NEW: ISO C 9x
5704 lroundl NEW: ISO C 9x
5706 makecontext NEW: Unix98
5707 mempcpy NEW: GNU ext.
5710 modify_ldt NEW: kernel
5714 nearbyint NEW: ISO C 9x
5715 nearbyintf NEW: ISO C 9x
5716 nearbyintl NEW: ISO C 9x
5717 netname2host NEW: Secure RPC
5718 netname2user NEW: Secure RPC
5719 nexttoward NEW: ISO C 9x
5720 nexttowardf NEW: ISO C 9x
5721 nexttowardl NEW: ISO C 9x
5725 passwd2des NEW: Secure RPC
5727 pow10f NEW: GNU ext.
5728 pow10l NEW: GNU ext.
5731 printf_size NEW: GNU ext.
5732 printf_size_info NEW: GNU ext.
5733 profil_counter REMOVED
5734 pthread_mutexattr_getkind_np REPLACED
5735 pthread_mutexattr_setkind_np REPLACED
5736 ptsname NEW: Unix98 PTY
5737 ptsname_r NEW: Unix98 PTY
5739 putchar_locked REMOVED
5740 putgrent NEW: GNU ext.
5742 putpmsg NEW: STREAMS
5743 pututxline NEW: Unix98
5747 readdir64_r NEW: LFS
5748 remquo NEW: ISO C 9x
5749 remquof NEW: ISO C 9x
5750 remquol NEW: ISO C 9x
5752 roundf NEW: ISO C 9x
5753 roundl NEW: ISO C 9x
5755 scalbln NEW: ISO C 9x
5756 scalblnf NEW: ISO C 9x
5757 scalblnl NEW: ISO C 9x
5759 sendfile NEW: kernel
5760 setcontext NEW: Unix98
5761 setrlimit64 NEW: LFS
5762 setutxent NEW: Unix98
5764 sigignore NEW: Unix98
5765 sigqueue NEW: POSIX.1b
5766 sigrelse NEW: Unix98
5767 sigset NEW: POSIX.1b
5768 sigtimedwait NEW: POSIX.1b
5769 sigwaitinfo NEW: POSIX.1b
5770 sincos NEW: GNU ext.
5771 sincosf NEW: GNU ext.
5772 sincosl NEW: GNU ext.
5776 strcasestr NEW: GNU ext.
5777 strtoimax NEW: ISO C 9x
5778 strtoumax NEW: ISO C 9x
5779 strverscmp NEW: GNU ext.
5780 svcauthdes_stats NEW: Secure RPC
5781 svcunix_create NEW: sunrpc etx
5782 svcunixfd_create NEW: sunrpc ext
5783 swapcontext NEW: Unix98
5784 tcgetsid NEW: Unix98 PTY
5785 tdestroy NEW: GNU ext.
5786 tgamma NEW: ISO C 9x
5787 tgammaf NEW: ISO C 9x
5788 tgammal NEW: ISO C 9x
5792 truncf NEW: ISO C 9x
5793 truncl NEW: ISO C 9x
5795 unlockpt NEW: Unix98 PTY
5796 updwtmpx NEW: Unix98
5797 user2netname NEW: Secure RPC
5798 utmpxname NEW: Unix98
5799 versionsort NEW: GNU ext.
5800 versionsort64 NEW: GNU ext.
5802 wcscasecmp NEW: GNU ext.
5803 wcsncasecmp NEW: GNU ext.
5804 wcsnlen NEW: GNU ext.
5805 wcstoimax NEW: ISO C 9x
5806 wcstoll NEW: ISO C 9x
5807 wcstoull NEW: ISO C 9x
5808 wcstoumax NEW: ISO C 9x
5810 wordexp NEW: POSIX.2
5811 wordfree NEW: POSIX.2
5812 write_profiling REMOVED
5813 xdecrypt NEW: Secure RPC
5814 xdr_authdes_cred NEW: Secure RPC
5815 xdr_authdes_verf NEW: Secure RPC
5816 xdr_cryptkeyarg NEW: Secure RPC
5817 xdr_cryptkeyarg2 NEW: Secure RPC
5818 xdr_cryptkeyres NEW: Secure RPC
5819 xdr_getcredres NEW: Secure RPC
5820 xdr_key_netstarg NEW: Secure RPC
5821 xdr_key_netstres NEW: Secure RPC
5822 xdr_keybuf NEW: Secure RPC
5823 xdr_keystatus NEW: Secure RPC
5824 xdr_netnamestr NEW: Secure RPC
5825 xdr_sizeof NEW: Secure RPC
5826 xdr_unixcred NEW: sunrpc ext
5827 xencrypt NEW: Secure RPC
5828 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5839 * inet_ntoa is thread-safe
5841 * updwtmp is moved from libutil to libc
5843 * rewrite of cbrt function
5845 * update of timezone data
5859 * add atoll function
5861 * fix complex problems in Berkeley DB code
5863 * fix math functions
5867 * fixed lots of header problems (especially Linux/GNU specific)
5869 * dynamic loader preserves all registers
5871 * Roland McGrath provided support for handling of auxiliary objects in
5872 the ELF dynamic loader.
5874 * support for parallel builds is improved
5878 * GNU extensions are no longer declared by default. To enable them you
5879 must define the macro `_GNU_SOURCE' in your program or compile with
5882 * The library has changed from using GNU ld symbol aliases to using weak
5883 symbols where available. The ELF object file format supports weak
5884 symbols; GNU ld also supports weak symbols in the a.out format. (There
5885 is also now support for other GNU ld extensions in ELF. Use the
5886 `--with-elf' option to configure to indicate you have ELF, and
5887 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5888 of many files which contained only symbol aliases, reducing the size of
5889 the source and the compiled library; many other files were renamed to
5890 less cryptic names previously occupied by the symbol alias files.
5891 There is a new header file <elf.h> for programs which operate on
5892 files in the ELF format.
5894 * Converted to Autoconf version 2, so `configure' has more options.
5895 Run `configure --help' to see the details.
5897 * The library can now be configured to build profiling, highly-optimized
5898 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5899 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5900 `configure' enable building these extra libraries. The shared library is
5901 built by default when using both ELF and GNU ld. When shared libraries
5902 are enabled, the new library `-ldl' is available for arbitrary run-time
5903 loading of shared objects; its interface is defined in <dlfcn.h>. The
5904 new header file <link.h> gives access to the internals of the run-time
5905 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5906 application of same name on other systems and it provides information
5907 about dynamically linked binaries.
5909 * The C library now provides the run-time support code for profiling
5910 executables compiled with `-pg'. Programs can control the profiling code
5911 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5912 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5913 the support for this file format was contributed by David Mosberger-Tang.
5915 * The math code has been replaced with a math library based on fdlibm from
5916 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5917 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5918 functions. The math functions now reside in a separate library, so
5919 programs using them will need to use `-lm' their linking commands.
5921 * John C. Bowman contributed optimized ix87 assembler inline functions.
5923 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5924 mechanism similar to that found in Solaris 2. This is now used for the
5925 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5926 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5927 file controls what services are used for each individual database. This
5928 works by loading shared libraries with names specified in `nsswitch.conf',
5929 so service modules can be changed or added at any time without even
5930 relinking any program. Currently there are the file, db, and NIS based
5931 NSS services available.
5933 * The new functions `strtoq' and `strtouq' parse integer values from
5934 strings, like `strtol' and `strtoul', but they return `long long int' and
5935 `unsigned long long int' values, respectively (64-bit quantities).
5937 * The new functions `strtof' and `strtold' parse floating-point values from
5938 strings, like `strtod', but they return `float' and `long double' values,
5939 respectively (on some machines `double' and `long double' are the same).
5941 * Ulrich Drepper has contributed new implementations of the floating-point
5942 printing and reading code used in the `printf' family of functions and
5943 `strtod', `strtof', and `strtold'. These new functions are perfectly
5944 accurate, and much faster than the old ones.
5946 * The implementation of the POSIX locale model was completely rewritten by
5947 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5948 to compile the POSIX locale definition.
5950 * The former dummy implementations of the strcoll and strxfrm function are
5951 now replaced by fully functional code contributed by Ulrich Drepper. The
5952 collation information comes from the POSIX locale definitions.
5954 * The new header <langinfo.h> defines an interface for accessing
5955 various locale-dependent data (using the locale chosen with `setlocale').
5957 * Ulrich Drepper has contributed a new suite of functions for operation on
5958 wide-character and multibyte-character strings, in <wchar.h>;
5959 and classification and case conversion of wide characters, in <wctype.h>.
5960 These new functions are conforming to the ISO C, Amendement 1 specification.
5962 * There is now a second implementation of the standard I/O library available.
5963 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5964 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5966 * You can now use positional parameter specifications in format strings
5967 for the `printf' and `scanf' families of functions. For example,
5968 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5969 ``Number 6, Mr Jones''. This is mainly useful when providing different
5970 format strings for different languages, whose grammars may dictate
5971 different orderings of the values being printed. To support this
5972 feature, the interface for `register_printf_handler' has changed; see
5973 the header file <printf.h> for details.
5975 * The `printf' and `scanf' families of functions now understand a new
5976 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5977 to group numbers as indicated by the locale; for `scanf' and friends, this
5978 says to accept as valid only a number with all the proper grouping
5979 separators in the right places. In the default "C" locale, numbers are
5980 not grouped; but locales for specific countries will define the usual
5981 conventions (i.e. separate thousands with `,' in the US locale).
5983 * The pgrp functions have been regularized, slightly incompatibly but much
5984 less confusingly. The core functions are now `getpgid' and `setpgid',
5985 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5986 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5987 provided for compatibility. There is no longer an incompatible `getpgrp'
5988 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5990 * The new header file <fts.h> and suite of functions simplify programs that
5991 operate on directory trees. This code comes from 4.4 BSD.
5993 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5994 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5995 NSS scheme used in glibc.
5997 * There is a new malloc debugging hook `__memalign_hook'.
5999 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6000 `unsigned int' in <sys/types.h>. These are for compatibility only and
6001 their use is discouraged.
6003 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6004 done differently, so that it works even without GNU ld.
6006 * New function `euidaccess' checks allowed access to a file like `access',
6007 but using the effective IDs instead of the real IDs.
6009 * The time zone data files have been updated for the latest and greatest
6010 local time conventions of the countries of the world.
6012 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6015 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6016 for formatting floating-point numbers. They are provided only for
6017 compatibility; new programs should use `sprintf' instead. There are
6018 also equivalent function for the `long double' floating-point type and
6019 all functions also exist in a reentrant form.
6021 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6022 functions for maintaining the login-record files (primarily of use to
6023 system programs such as `login'), and convenient functions for
6024 allocating and initializing a pseudo-terminal (pty) device.
6026 * Ulrich Drepper has contributed new support for System V style
6027 shared memory and IPC on systems that support it.
6029 * Ulrich Drepper has contributed several miscellaneous new functions found
6030 in System V: The `hsearch' family of functions provide an effective
6031 implementation of hash tables; `a64l' and `l64a' provide a very simple
6032 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6035 * Ulrich Drepper has contributed new reentrant counterparts for the
6036 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6038 * Ulrich Drepper has contributed new, highly-optimized versions of several
6039 string functions for the i486/Pentium family of processors.
6041 * Ulrich Drepper has updated the Linux-specific code, based largely
6042 on work done in Hongjiu Lu's version of GNU libc for Linux.
6043 The GNU library now supports Linux versions 2.0.10 and later,
6044 using the ELF object file format (i[3456]86-*-linux).
6046 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6048 * David Mosberger-Tang and Richard Henderson have ported the C library
6049 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6050 dynamic linking support for ELF/Alpha.
6052 * Richard Henderson contributed several Alpha optimized assembler function
6053 for arithmetic and string handling.
6055 * Ulrich Drepper has contributed a new set of message catalog functions to
6056 support multiple languages using the <libintl.h> interface, for use with
6057 his new package GNU gettext. Translation volunteers have contributed
6058 catalogs of the library's messages in Spanish, German, and Korean.
6060 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6061 program and the `catgets' function for reading the catalog files it
6062 creates. (The <libintl.h> interface is preferred; we include the
6063 <nl_types.h> interface using `catgets' only for source compatibility with
6064 programs already written to use it.)
6066 * New header file <values.h> gives SVID-compatible names for <limits.h>
6069 * Various new macros, declarations, and small header files for compatibility
6072 * New function `group_member' is a convenient way to check if a process has
6073 a given effective group ID.
6075 * When using GCC 2.7 and later, the socket functions are now declared in a
6076 special way so that passing an argument of type `struct sockaddr_in *',
6077 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6078 `struct sockaddr *' type, does not generate a type-clash warning.
6080 * New function `error' declared in header file <error.h> is a convenient
6081 function for printing error messages and optionally exiting; this is the
6082 canonical function used in GNU programs. The new functions `err', `warn',
6083 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6084 doing the same thing.
6086 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6087 POSIX.2 `glob' function to do ~ and {...} expansion.
6089 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6090 `clearenv' which is used in POSIX.9 is also available.
6092 * New function `getsid' returns session ID number on systems that support it.
6094 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6095 files <db.h> and <mpool.h> provide a rich set of functions for several
6096 types of simple databases stored in memory and in files, and <ndbm.h> is
6097 an old `ndbm'-compatible interface using the `db' functions. Link with
6098 `-ldb' to get these functions.
6100 * New macro `strdupa' copies a string like `strdup', but uses local stack
6101 space from `alloca' instead of dynamic heap space from `malloc'.
6103 * New function `strnlen' is like `strlen' but searches only a given maximum
6104 number of characters for the null terminator. `stpncpy', `strndup' and
6105 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6108 * New function `statfs' in header <sys/statfs.h>.
6110 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6111 provide convenient functions for operating on blocks of null-terminated
6114 * A new suite of functions in <utmp.h> handle all the details of reading
6115 and writing the utmp file.
6117 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6120 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6121 completely POSIX compliant and also implemented the extended functionality
6122 to handle alternate digit representation and alternate era date formats.
6124 * Ulrich Drepper provided an implementation of the `strptime' function
6125 defined in XPG4.2 which transforms a string into a `struct tm' value.
6127 * Paul Eggert provided the tzselect shell script as part of the timezone
6128 code. The shell script makes it easy to select the correct timezone
6131 * The implementation of the malloc family of functions is completely replaced
6132 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6133 The implementation uses the mmap function (if available) and it is
6134 optimized for the use in multi threaded programs.
6136 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6137 functions. This new functionality is usable by specifying a special
6138 salt string and it is compatible with implementation on *BSD systems.
6140 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6141 `getsubopt' to handle second level command line options, `bsd_signal'
6142 to access BSD style `signal' functionality, the obsolete `regexp' style
6145 * the `lchown' function is available on system which support this
6148 * The implementation of the shadow password handling function was contributed
6151 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6153 * POSIX.1g support was added. The <sys/select.h> header is available,
6154 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6155 implementation of `getaddrinfo'.
6159 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6161 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6162 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6164 * The new function `daemon' from 4.4 BSD is useful for server programs that
6165 want to put themselves in the background.
6167 * Joel Sherrill has contributed support for several standalone boards that
6168 run without an operating system.
6170 * `printf', `scanf' and friends now accept a `q' type modifier for long
6171 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6173 * All of the code taken from BSD (notably most of the math and networking
6174 routines) has been updated from the BSD 4.4-Lite release.
6176 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6178 * The new functions `getdomainname' and `setdomainname' fetch or change the
6179 YP/NIS domain name. These are system calls which exist on systems which
6182 * The time zone data files have been updated for the latest international
6185 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6186 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6190 * The C library now includes support for Sun RPC, from Sun's free
6191 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6192 are included. (There is still no support for YP.)
6194 * Tom Quinn has contributed a port of the C library to SGI machines running
6195 Irix 4 (mips-sgi-irix4).
6197 * The new `lockf' function is a simplified interface to the locking
6198 facilities of `fcntl', included for compatibility.
6200 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6202 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6204 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6207 * The error message printed by `assert' for a failed assertion now includes
6208 the name of the program (if using GNU ld) and the name of the calling
6209 function (with versions of GCC that support this).
6211 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6213 * The library now includes the <sys/mman.h> header file and memory
6214 management functions `mmap', `munmap', `mprotect', `msync', and
6215 `madvise', on systems that support those facilities.
6217 * The interface for `mcheck' has changed slightly: the function called to
6218 abort the program when an allocation inconsistency is detected now takes
6219 an argument that indicates the type of failure. The new function
6220 `mprobe' lets you request a consistency check for a particular block at
6221 any time (checks are normally done only when you call `free' or `realloc'
6224 * It is now possible to easily cross-compile the C library, building on one
6225 system a library to run on another machine and/or operating system. All
6226 you need to do is set the variable `HOST_CC' in `configparms' to the
6227 native compiler for programs to run on the machine you are building on (a
6228 few generator programs are used on Unix systems); set `CC' to the
6231 * The new function `fexecve' (only implemented on the GNU system) executes
6232 a program file given a file descriptor already open on the file.
6236 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6237 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6239 * You can set the variable `libprefix' in `configparms' to specify a prefix
6240 to be prepended to installed library files; this makes it easy to install
6241 the GNU C library to be linked as `-lgnuc' or whatever.
6243 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6244 copies a limited number of characters from a string, and returns the
6245 address of the last character written.
6247 * You no longer need to check for whether the installed `stddef.h' is
6248 compatible with the GNU C library. configure now checks for you.
6250 * You can now define a per-stream `fileno' function to convert the
6251 stream's cookie into an integral file descriptor.
6253 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6254 allocates zero bytes of storage, and returns a unique pointer which
6255 you can pass to `realloc' or `free'. The behavior is undefined if
6256 you dereference this pointer.
6258 * The C library now runs on Sony NEWS m68k machines running either
6259 NewsOS 3 or NewsOS 4.
6261 * The new `syscall' function is a system-dependent primitive function
6262 for invoking system calls. It has the canonical behavior on Unix
6263 systems, including unreliable return values for some calls (such as
6264 `pipe', `fork' and `getppid').
6266 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6267 to `EAGAIN', which is the preferred name. On systems whose kernels
6268 use two distinct codes, the C library now translates EWOULDBLOCK to
6269 EAGAIN in every system call function.
6273 * The GNU C Library Reference Manual is now distributed with the library.
6274 `make dvi' will produce a DVI file of the printed manual.
6275 `make info' will produce Info files that you can read on line using C-h i
6276 in Emacs or the `info' program.
6277 Please send comments on the manual to bug-glibc-manual@gnu.org.
6279 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6281 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6283 * Jason Merrill has contributed a port to the Sequent Symmetry running
6284 Dynix version 3 (i386-sequent-dynix).
6286 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6287 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6289 * New function `memory_warnings' lets you arrange to get warnings when
6290 malloc is running out of memory to allocate, like Emacs gives you.
6292 * The C library now contains the relocating allocator used in Emacs 19 for
6293 its editing buffers. This allocator (ralloc) minimizes allocation
6294 overhead and fragmentation by moving allocated regions around whenever it
6295 needs to. You always refer to a ralloc'd region with a "handle" (a
6296 pointer to a pointer--an object of type `void **').
6298 * There is a new `printf' format: `%m' gives you the string corresponding
6299 to the error code in `errno'.
6301 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6302 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6303 pass, the `a' modifier says to fill in a `char **' you pass with a
6306 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6307 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6308 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6310 * `mkstemp' is a traditional Unix function to atomically create and open a
6311 uniquely-named temporary file.
6315 * The standard location for the file that says what the local timezone is
6316 has changed again. It is now `/usr/local/etc/localtime' (or more
6317 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6319 * The distribution no longer contains any files with names longer than 14
6322 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6323 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6325 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6329 * The configuration process has changed quite a bit. The `configure'
6330 script is now used just like the configuration scripts for other GNU
6331 packages. The `sysdeps' directory hierarchy is much rearranged.
6332 The file `INSTALL' explains the new scheme in detail.
6334 * The header files no longer need to be processed into ANSI C and
6335 traditional C versions. There is just one set of files to install, and
6336 it will work with ANSI or old C compilers (including `gcc -traditional').
6338 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6339 MIPS DECStation running Ultrix 4.
6341 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6342 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6343 made itself into a shared library.
6345 * Yet further improved support for the i386, running 4.3 BSD-like systems
6346 (such as Mach 3 with the Unix single-server), or System V.
6348 * New function `strncasecmp' to do case-insensitive string comparison
6349 with limited length.
6351 * New function `strsep' is a reentrant alternative to `strtok'.
6353 * New functions `scandir' and `alphasort' for searching directories.
6355 * New function `setenv' is a better interface to `putenv'.
6357 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6358 function for traversing a directory tree.
6360 * The GNU obstack package is now also part of the C library.
6361 The new function `open_obstack_stream' creates a stdio stream that
6362 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6363 formatted output directly to an obstack.
6365 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6366 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6368 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6370 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6371 things to your strings.
6373 * There are some new test programs: test-fseek, testmb, and testrand.
6375 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6376 These ports are not finished, but are a good starting place for really
6377 supporting those systems.
6379 * `/etc/localtime' is now the standard location for the file that says what
6380 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6381 This follows the general principle that `/etc' is the place for all local
6382 configuration files.
6384 * The C library header files now use `extern "C"' when used by the C++
6385 compiler, so the C library should now work with C++ code.
6387 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6388 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6391 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6392 function which uses the `merge sort' algorithm, and is said to be
6393 significantly faster than the old GNU `qsort' function. Merge sort is
6394 now the standard `qsort' function. The new algorithm can require a lot
6395 of temporary storage; so, the old sorting function is called when the
6396 required storage is not available.
6398 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6399 provides the Unix `crypt' function, plus some other entry points.
6401 * The code and header files taken from 4.4 BSD have been updated with the
6402 latest files released from Berkeley.
6404 ----------------------------------------------------------------------
6407 Permission is granted to anyone to make or distribute verbatim copies
6408 of this document as received, in any medium, provided that the
6409 copyright notice and this permission notice are preserved,
6410 thus giving the recipient permission to redistribute in turn.
6412 Permission is granted to distribute modified versions
6413 of this document, or of portions of it,
6414 under the above conditions, provided also that they
6415 carry prominent notices stating who last changed them.
6418 version-control: never