1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2020 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 * Unicode 13.0.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 13.0.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
18 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
19 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
20 Three ABIs are supported:
26 The arc* ABI is little-endian while arceb is big-endian. All ABIs use
27 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
29 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
30 DT_DEPAUDIT dynamic section entries of the main executable.
32 * powerpc64le supports IEEE128 long double libm/libc redirects when
33 using the -mabi=ieeelongdouble to compile C code on supported GCC
34 toolchains. It is recommended to use GCC 8 or newer when testing
37 * To help detect buffer overflows and other out-of-bounds accesses
38 several APIs have been annotated with GCC 'access' attribute. This
39 should help GCC 10 issue better warnings.
41 * On Linux, functions the pthread_attr_setsigmask_np and
42 pthread_attr_getsigmask_np have been added. They allow applications
43 to specify the signal mask of a thread created with pthread_create.
45 * The GNU C Library now provides the header file <sys/single_threaded.h>
46 which declares the variable __libc_single_threaded. Applications are
47 encouraged to use this variable for single-thread optimizations,
48 instead of weak references to symbols historically defined in
51 * The functions sigabbrev_np and sigdescr_np have been added. The
52 sigabbrev_np returns the abbreviated signal name (e.g. "HUP" for SIGHUP)
53 while sigdescr_np returns a string describing the signal number (e.g
54 "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
55 attempt to translate the return description, both functions return
56 NULL for an invalid signal number.
58 They should be used instead of sys_siglist or sys_sigabbrev and they
59 are both thread and async-signal safe. These functions are GNU extensions.
61 * The functions strerrorname_np and strerrordesc_np have been added. The
62 strerroname_np returns error number name (e.g. "EINVAL" for EINVAL) while
63 strerrordesc_np returns string describing error number
64 (e.g "Invalid argument" for EINVAL). Different than strerror,
65 strerrordesc_np does not attempt to translate the return description, both
66 functions return NULL for an invalid error number.
68 They should be used instead of sys_errlist and sys_nerr, both are
69 thread and async-signal safe. These functions are GNU extensions.
71 * AArch64 now supports standard branch protection security hardening
72 in glibc when it is built with a GCC that is configured with
73 --enable-standard-branch-protection. This includes branch target
74 identification (BTI) and pointer authentication for return addresses
75 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
76 extensions respectively for the protection to be effective,
77 otherwise the used instructions are nops. User code can use PAC-RET
78 without libc support, but BTI requires a libc that is built with BTI
79 support, otherwise runtime objects linked into user code will not be
82 Deprecated and removed features, and other changes affecting compatibility:
84 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
85 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
86 RPC header files. Backward compatibility for old programs is kept
87 only for architectures and ABIs that have been added in or before
88 glibc 2.31. New programs need to use TI-RPC
89 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
90 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
92 * Remove configure option --enable-obsolete-nsl. libnsl is only built
93 as shared library for backward compatibility and the NSS modules "nis"
94 and "nisplus" are not built at all and libnsl's headers aren't
95 installed. This compatibility is kept only for architectures and ABIs
96 that have been added in or before version 2.28. Replacement
97 implementations based on TI-RPC, which additionally support IPv6, are
98 available from <https://github.com/thkukuk/>. This change does not
99 affect the "compat" NSS module, which does not depended on libnsl
100 since 2.27 and thus can be used without NIS.
102 * The deprecated <sys/sysctl.h> header and the sysctl function have been
103 removed. To support old binaries, the sysctl function continues to
104 exist as a compatibility symbol (on those architectures which had it),
105 but always fails with ENOSYS. This reflects the removal of the system
106 call from all architectures, starting with Linux 5.5.
108 * The sstk function is no longer available to newly linked binaries.
109 Its implementation always returned with a failure, and the function
110 was not declared in any header file.
112 * The legacy signal handling functions siginterrupt, sigpause, sighold,
113 sigrelse, sigignore and sigset, and the sigmask macro have been
114 deprecated. Applications should use the sigsuspend, sigprocmask and
115 sigaction functions instead.
117 * ldconfig now defaults to the new format for ld.so.cache. glibc has
118 already supported this format for almost 20 years.
120 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
121 are no longer available to newly linked binaries, and their declarations
122 have been removed from <string.h>. They are exported solely as
123 compatibility symbols to support old binaries. All programs should use
126 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
127 are no longer available to newly linked binaries, and their declarations
128 have been removed from from <stdio.h>. They are exported solely as
129 compatibility symbols to support old binaries. All programs should use
130 strerror or strerror_r instead.
132 * Both strerror and strerror_l now share the same internal buffer in the
133 calling thread, meaning that the returned string pointer may be invalided
134 or contents might be overwritten on subsequent calls in the same thread or
135 if the thread is terminated. It makes strerror MT-safe.
137 * Using weak references to libpthread functions such as pthread_create
138 or pthread_key_create to detect the singled-threaded nature of a
139 program is an obsolescent feature. Future versions of glibc will
140 define pthread_create within libc.so.6 itself, so such checks will
141 always flag the program as multi-threaded. Applications should check
142 the __libc_single_threaded variable declared in
143 <sys/single_threaded.h> instead.
145 * The "files" NSS module no longer supports the "key" database (used for
146 secure RPC). The contents of the /etc/publickey file will be ignored,
147 regardless of the settings in /etc/nsswitch.conf. (This method of
148 storing RPC keys only supported the obsolete and insecure AUTH_DES
149 flavor of secure RPC.)
151 * The __morecore and __after_morecore_hook malloc hooks and the default
152 implementation __default_morecore have been deprecated. Applications
153 should use malloc interposition to change malloc behavior, and mmap to
154 allocate anonymous memory. A future version of glibc may require that
155 applications which use the malloc hooks must preload a special shared
156 object, to enable the hooks.
158 * The hesiod NSS module has been deprecated and will be removed in a
159 future version of glibc. System administrators are encouraged to
160 switch to other approaches for networked account databases, such as
163 Changes to build and runtime requirements:
165 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
166 long double redirects.
168 Security related changes:
170 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
171 invoked with the -c option and when processing invalid multi-byte input
172 sequences. Reported by Jan Engelhardt.
174 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
175 corruption when they were passed a pseudo-zero argument. Reported by Guido
176 Vranken / ForAllSecure Mayhem.
178 CVE-2020-1752: A use-after-free vulnerability in the glob function when
179 expanding ~user has been fixed.
181 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
182 memmove functions has been fixed. Discovered by Jason Royes and Samual
183 Dytrych of the Cisco Security Assessment and Penetration Team (See
186 The following bugs are resolved with this release:
188 [The release manager will add the list generated by
189 scripts/list-fixed-bugs.py just before the release.]
195 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
196 enable features from the draft ISO C2X standard. Only some features from
197 this draft standard are supported by the GNU C Library, and as the draft
198 is under active development, the set of features enabled by this macro is
199 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
200 by compiling with "gcc -std=gnu2x".
202 * The <math.h> functions that round their results to a narrower type now
203 have corresponding type-generic macros in <tgmath.h>, as defined in TS
204 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
205 Clarification Request 13 to TS 18661-3.
207 * The function pthread_clockjoin_np has been added, enabling join with a
208 terminated thread with a specific clock. It allows waiting against
209 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
211 * New locale added: mnw_MM (Mon language spoken in Myanmar).
213 * The DNS stub resolver will optionally send the AD (authenticated data) bit
214 in queries if the trust-ad option is set via the options directive in
215 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
216 mode, the AD bit, as provided by the name server, is available to
217 applications which call res_search and related functions. In the default
218 mode, the AD bit is not set in queries, and it is automatically cleared in
219 responses, indicating a lack of DNSSEC validation. (Therefore, the name
220 servers and the network path to them are treated as untrusted.)
222 Deprecated and removed features, and other changes affecting compatibility:
224 * The totalorder and totalordermag functions, and the corresponding
225 functions for other floating-point types, now take pointer arguments to
226 avoid signaling NaNs possibly being converted to quiet NaNs in argument
227 passing. This is in accordance with the resolution of Clarification
228 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
229 floating-point arguments directly will continue to work.
231 * The obsolete function stime is no longer available to newly linked
232 binaries, and its declaration has been removed from <time.h>.
233 Programs that set the system time should use clock_settime instead.
235 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
236 in a future version of glibc. In this release, the header still exists
237 but calling ftime will cause a compiler warning. All programs should use
238 gettimeofday or clock_gettime instead.
240 * The gettimeofday function no longer reports information about a
241 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
242 many years, as it cannot handle the full complexity of the world's
243 timezones, but hitherto we have supported it on a best-effort basis.
244 Changes required to support 64-bit time_t on 32-bit architectures have
245 made this no longer practical.
247 As of this release, callers of gettimeofday with a non-null 'tzp' argument
248 should expect to receive a 'struct timezone' whose tz_minuteswest and
249 tz_dsttime fields are zero. (For efficiency reasons, this does not always
250 happen on a few Linux-based ports. This will be corrected in a future
253 All callers should supply a null pointer for the 'tzp' argument to
254 gettimeofday. For accurate information about the time zone associated
255 with the current time, use the localtime function.
257 gettimeofday itself is obsolescent according to POSIX. We have no plans
258 to remove access to this function, but portable programs should consider
259 using clock_gettime instead.
261 * The settimeofday function can still be used to set a system-wide time
262 zone when the operating system supports it. This is because the Linux
263 kernel reused the API, on some architectures, to describe a system-wide
264 time-zone-like offset between the software clock maintained by the kernel,
265 and the "RTC" clock that keeps time when the system is shut down.
267 However, to reduce the odds of this offset being set by accident,
268 settimeofday can no longer be used to set the time and the offset
269 simultaneously. If both of its two arguments are non-null, the call
270 will fail (setting errno to EINVAL).
272 Callers attempting to set this offset should also be prepared for the call
273 to fail and set errno to ENOSYS; this already happens on the Hurd and on
274 some Linux architectures. The Linux kernel maintainers are discussing a
275 more principled replacement for the reused API. After a replacement
276 becomes available, we will change settimeofday to fail with ENOSYS on all
277 platforms when its 'tzp' argument is not a null pointer.
279 settimeofday itself is obsolescent according to POSIX. Programs that set
280 the system time should use clock_settime and/or the adjtime family of
281 functions instead. We may cease to make settimeofday available to newly
282 linked binaries after there is a replacement for Linux's time-zone-like
285 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
286 the optional CAS instruction is implemented (for instance, LEON processors
287 are still supported, but SuperSPARC processors are not).
289 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
292 * If a lazy binding failure happens during dlopen, during the execution of
293 an ELF constructor, the process is now terminated. Previously, the
294 dynamic loader would return NULL from dlopen, with the lazy binding error
295 captured in a dlerror message. In general, this is unsafe because
296 resetting the stack in an arbitrary function call is not possible.
298 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
299 executable stack unless explicitly configured at build time to require
300 minimum kernel version 4.8 or newer. This is because executing
301 floating-point branches on a non-executable stack on Linux kernels prior to
302 4.8 can lead to application crashes for some MIPS configurations. While
303 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
304 expected to enable non-executable stack by default with PT_GNU_STACK by
305 default and is thus likely to trigger a crash on older kernels.
307 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
308 non-executable stack while dropping support for older kernels.
310 * System call wrappers for time system calls now use the new time64 system
311 calls when available. On 32-bit targets, these wrappers attempt to call
312 the new system calls first and fall back to the older 32-bit time system
313 calls if they are not present. This may cause issues in environments
314 that cannot handle unsupported system calls gracefully by returning
315 -ENOSYS. Seccomp sandboxes are affected by this issue.
317 Changes to build and runtime requirements:
319 * It is no longer necessary to have recent Linux kernel headers to build
320 working (non-stub) system call wrappers on all architectures except 64-bit
321 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
323 * The ChangeLog file is no longer present in the toplevel directory of the
324 source tree. ChangeLog files are located in the ChangeLog.old directory as
325 ChangeLog.N where the highest N has the latest entries.
327 Security related changes:
329 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
330 out-of-bounds write when executed in a signal frame context.
332 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
333 environment variable during program execution after a security
334 transition, allowing local attackers to restrict the possible mapping
335 addresses for loaded libraries and thus bypass ASLR for a setuid
336 program. Reported by Marcin Kościelnicki.
338 The following bugs are resolved with this release:
340 [12031] localedata: iconv -t ascii//translit with Greek characters
341 [15813] libc: Multiple issues in __gen_tempname
342 [17726] libc: [arm, sparc] profil_counter should be compat symbol
343 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
344 [19767] libc: vdso is not used with static linking
345 [19903] hurd: Shared mappings not being inherited by children processes
346 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
347 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
349 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
350 Symbols-A/B Unicode blocks
351 [23518] libc: Eliminate __libc_utmp_jump_table
352 [24026] malloc: malloc_info() returns wrong numbers
353 [24054] localedata: Many locales are missing date_fmt
354 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
355 [24304] dynamic-link: Lazy binding failure during ELF
356 constructors/destructors is not fatal
357 [24376] libc: RISC-V symbol size confusion with _start
358 [24682] localedata: zh_CN first weekday should be Monday per GB/T
360 [24824] libc: test-in-container does not install charmap files compatible
362 [24844] regex: regex bad pointer / leakage if malloc fails
363 [24867] malloc: Unintended malloc_info formatting changes
364 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
365 [24880] libc: login: utmp implementation uses struct flock with fcntl64
366 [24882] libc: login: pututline uses potentially outdated cache
367 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
368 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
370 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
372 [24930] dynamic-link: dlopen of PIE executable can result in
373 _dl_allocate_tls_init assertion failure
374 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
375 (stringop-overflow error)
376 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
377 functions other can lead to crashes
378 [24967] libc: jemalloc static linking causes runtime failure
379 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
381 [25035] libc: sbrk() failure handled poorly in tunables_strdup
382 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
383 [25097] libc: new -Warray-bounds with GCC 10
384 [25112] dynamic-link: dlopen must not make new objects accessible when it
385 still can fail with an error
386 [25139] localedata: Please add the new mnw_MM locale
387 [25149] regex: Array bounds violation in proceed_next_node
388 [25157] dynamic-link: Audit cookie for the dynamic loader is not
389 initialized correctly
390 [25189] libc: glibc's __glibc_has_include causes issues with clang
392 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
394 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
395 binaries (CVE-2019-19126)
396 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
398 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
400 [25232] string: <string.h> does not enable const correctness for strchr et
402 [25233] localedata: Consider "." as the thousands separator for sl_SI
404 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
405 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
406 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
408 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
409 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
411 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
412 (dl_initfirst) link map pointer
413 [25401] malloc: pvalloc must not have __attribute_alloc_size__
414 [25423] libc: Array overflow in backtrace on powerpc
415 [25425] network: Missing call to __resolv_context_put in
416 getaddrinfo.c:gethosts
423 * Unicode 12.1.0 Support: Character encoding, character type info, and
424 transliteration tables are all updated to Unicode 12.1.0, using
425 generator scripts contributed by Mike FABIAN (Red Hat).
427 * The dynamic linker accepts the --preload argument to preload shared
428 objects, in addition to the LD_PRELOAD environment variable.
430 * The twalk_r function has been added. It is similar to the existing
431 twalk function, but it passes an additional caller-supplied argument
432 to the callback function.
434 * On Linux, the getdents64, gettid, and tgkill functions have been added.
436 * Minguo (Republic of China) calendar support has been added as an
437 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
440 * The entry for the new Japanese era has been added for ja_JP locale.
442 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
443 pvalloc, memalign, and posix_memalign fail now with total object size
444 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
445 pointer subtraction within the allocated object, where results might
446 overflow the ptrdiff_t type.
448 * The dynamic linker no longer refuses to load objects which reference
449 versioned symbols whose implementation has moved to a different soname
450 since the object has been linked. The old error message, symbol
451 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
452 link time reference, is gone.
454 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
455 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
456 functions. These behave similarly to their "timed" equivalents, but also
457 accept a clockid_t parameter to determine which clock their timeout should
458 be measured against. All functions allow waiting against CLOCK_MONOTONIC
459 and CLOCK_REALTIME. The decision of which clock to be used is made at the
460 time of the wait (unlike with pthread_condattr_setclock, which requires
461 the clock choice at initialization time).
463 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
464 work, new resolvers can use a second argument which can be extended in
465 the future, currently it contains the AT_HWCAP2 value.
467 Deprecated and removed features, and other changes affecting compatibility:
469 * The copy_file_range function fails with ENOSYS if the kernel does not
470 support the system call of the same name. Previously, user space
471 emulation was performed, but its behavior did not match the kernel
472 behavior, which was deemed too confusing. Applications which use the
473 copy_file_range function can no longer rely on glibc to provide a fallback
474 on kernels that do not support the copy_file_range system call, and if
475 this function returns ENOSYS, they will need to use their own fallback.
476 Support for copy_file_range for most architectures was added in version
477 4.5 of the mainline Linux kernel.
479 * The functions clock_gettime, clock_getres, clock_settime,
480 clock_getcpuclockid, clock_nanosleep were removed from the librt library
481 for new applications (on architectures which had them). Instead, the
482 definitions in libc will be used automatically, which have been available
485 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
486 and <sys/stropts.h> have been removed.
488 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
489 resolver flag (deprecated in glibc 2.25) have been removed.
491 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
492 resolver have been removed from <resolv.h>.
494 * With --enable-bind-now, installed programs are now linked with the
497 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
498 configurations) has been removed, following the deprecation of this
499 subarchitecture in version 8 of GCC, and its removal in version 9.
501 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
502 header have been removed.
504 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
505 deprecated and will be removed from a future version of glibc.
506 Application should directly access /proc instead. For obtaining random
507 bits, the getentropy function can be used.
509 Changes to build and runtime requirements:
511 * GCC 6.2 or later is required to build the GNU C Library.
513 Older GCC versions and non-GNU compilers are still supported when
514 compiling programs that use the GNU C Library.
516 Security related changes:
518 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
519 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
520 has undefined behavior. On x32, the size_t argument may be passed
521 in the lower 32 bits of the 64-bit RDX register with non-zero upper
522 32 bits. When it happened with the sign bit of RDX register set,
523 memcmp gave the wrong result since it treated the size argument as
524 zero. Reported by H.J. Lu.
526 CVE-2019-9169: Attempted case-insensitive regular-expression match
527 via proceed_next_node in posix/regexec.c leads to heap-based buffer
528 over-read. Reported by Hongxu Chen.
530 The following bugs are resolved with this release:
532 [2872] locale: Transliteration Cyrillic -> ASCII fails
533 [6399] libc: gettid() should have a wrapper
534 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
535 [16976] glob: fnmatch unbounded stack VLA for collating symbols
536 [17396] localedata: globbing for locale by [[.collating-element.]]
537 [18035] dynamic-link: pldd does no longer work, enters infinite loop
538 [18465] malloc: memusagestat is built using system C library
539 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
540 invalid input drops valid char
541 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
542 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
543 [21897] localedata: Afar locales: Fix mon, abmon, and abday
544 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
545 [23352] malloc: __malloc_check_init still defined in public header
547 [23403] nptl: Wrong alignment of TLS variables
548 [23501] libc: nftw() doesn't return dangling symlink's inode
549 [23733] malloc: Check the count before calling tcache_get()
550 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
552 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
553 [23844] nptl: pthread_rwlock_trywrlock results in hang
554 [23983] argparse: Missing compat versions of argp_failure and argp_error
555 for long double = double
556 [23984] libc: Missing compat versions of err.h and error.h functions for
558 [23996] localedata: Dutch salutations
559 [24040] libc: riscv64: unterminated call chain in __thread_start
560 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
562 [24051] stdio: puts and putchar ouput to _IO_stdout instead of stdout
563 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
565 [24114] regex: regexec buffer read overrun in "grep -i
566 '\(\(\)*.\)*\(\)\(\)\1'"
567 [24122] libc: Segfaults if 0 returned from la_version
568 [24153] stdio: Some input functions do not react to stdin assignment
569 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
570 RDX is set) (CVE-2019-7309)
571 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
572 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
573 not the default "nor"
574 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
575 false positives, change to modern flexible array
576 [24180] nptl: pthread_mutex_trylock does not use the correct order of
577 instructions while maintaining the robust mutex list due to missing
579 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
580 unnecessary librt dependencies
581 [24200] localedata: Revert first_weekday removal in en_IE locale
582 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
583 [24215] nptl: pthread_timedjoin_np should be a cancellation point
584 [24216] malloc: Check for large bin list corruption when inserting
586 [24228] stdio: old x86 applications that use legacy libio crash on exit
587 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
589 [24293] localedata: Missing Minguo calendar support for TW locales
590 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
592 [24307] localedata: Update locale data to Unicode 12.0.0
593 [24323] dynamic-link: dlopen should not be able open PIE objects
594 [24335] build: "Obsolete types detected" with Linux 5.0 headers
595 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
597 [24370] localedata: Add lang_name for tt_RU locale
598 [24372] locale: Binary locale files are not architecture independent
599 [24394] time: strptime %Ey mis-parses final year of era
600 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
602 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
604 [24531] malloc: Malloc tunables give tcache assertion failures
605 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
607 [24535] localedata: Update locale data to Unicode 12.1.0
608 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
609 kernels and break testing
610 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
611 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
612 [-Werror=format-overflow=]
613 [24570] libc: alpha: compat msgctl uses __IPC_64
614 [24584] locale: Data race in __wcsmbs_clone_conv
615 [24588] stdio: Remove codecvt vtables from libio
616 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
618 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
619 [24632] stdio: Old binaries which use freopen with default stdio handles
621 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
623 [24652] localedata: szl_PL spelling correction
624 [24695] nss: nss_db: calling getpwent after endpwent crashes
625 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
626 in /etc/nsswitch.conf
627 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
628 [24740] libc: getdents64 type confusion
629 [24741] dynamic-link: ld.so should not require that a versioned symbol is
630 always implemented in the same library
631 [24744] libc: Remove copy_file_range emulation
632 [24757] malloc: memusagestat is linked against system libpthread
633 [24794] libc: Partial test suite run builds corrupt test-in-container
641 * The getcpu wrapper function has been added, which returns the currently
642 used CPU and NUMA node. This function is Linux-specific.
644 * A new convenience target has been added for distribution maintainers
645 to build and install all locales as directories with files. The new
646 target is run by issuing the following command in your build tree:
647 'make localedata/install-locale-files', with an optional DESTDIR
648 to set the install root if you wish to install into a non-default
651 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
653 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
654 for _GNU_SOURCE, to match BSD environments.
656 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
657 indicates that it will abort the transaction prior to entering the kernel
658 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
659 suspended, and this caused some undefined side-effects issues by aborting
660 transactions manually. Glibc avoided it by abort transactions manually on
661 each syscall, but it lead to performance issues on newer kernels where the
662 HTM state is saved and restore lazily (the state being saved even when the
663 process actually does not use HTM).
665 * The functions posix_spawn_file_actions_addchdir_np and
666 posix_spawn_file_actions_addfchdir_np have been added, enabling
667 posix_spawn and posix_spawnp to run the new process in a different
668 directory. These functions are GNU extensions. The function
669 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
672 * The popen and system do not run atfork handlers anymore (BZ#17490).
673 Although it is a possible POSIX violation, the POSIX rationale in
674 pthread_atfork documentation regarding atfork handlers is to handle
675 inconsistent mutex state after a fork call in a multi-threaded process.
676 In both popen and system there is no direct access to user-defined mutexes.
678 * Support for the C-SKY ABIV2 running on Linux has been added. This port
679 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
681 - C-SKY ABIV2 soft-float little-endian
682 - C-SKY ABIV2 hard-float little-endian
684 * strftime's default formatting of a locale's alternative year (%Ey)
685 has been changed to zero-pad the year to a minimum of two digits,
686 like "%y". This improves the display of Japanese era years during
687 the first nine years of a new era, and is expected to be harmless
688 for all other locales (only Japanese locales regularly have
689 alternative year numbers less than 10). Zero-padding can be
690 overridden with the '_' or '-' flags (which are GNU extensions).
692 * As a GNU extension, the '_' and '-' flags can now be applied to
693 "%EY" to control how the year number is formatted; they have the
694 same effect that they would on "%Ey".
696 Deprecated and removed features, and other changes affecting compatibility:
698 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
699 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
701 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
702 in <sys/procfs.h>, has been corrected to match the type actually used by
703 the Linux kernel. This affects the size and layout of that structure on
704 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
706 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
707 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
708 defined in <sys/procfs.h>, has been corrected to match the type actually
709 used by the Linux kernel. This affects the size and layout of those
712 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
713 meant to scan a string and allocate space for it with malloc, is now
714 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
715 defined. This extension conflicts with C99's use of '%a' to scan a
716 hexadecimal floating-point number, which is now available to programs
717 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
719 POSIX.1-2008 includes the feature of allocating a buffer for string input
720 with malloc, using the modifier letter 'm' instead. Programs using
721 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
722 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
723 C99 '%a' no longer need to avoid _GNU_SOURCE.
725 GCC's -Wformat warnings can detect most uses of this extension, as long
726 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
727 __attribute__ ((format (scanf, ...))).
729 Changes to build and runtime requirements:
731 * Python 3.4 or later is required to build the GNU C Library.
733 * On most architectures, GCC 5 or later is required to build the GNU C
734 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
736 Older GCC versions and non-GNU compilers are still supported when
737 compiling programs that use the GNU C Library.
739 Security related changes:
741 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
742 denial of service due to resource exhaustion when processing getaddrinfo
743 calls with crafted host names. Reported by Guido Vranken.
745 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
746 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
747 happened, accessing the 32-bit size_t value as the full 64-bit register
748 in the assembly string/memory functions would cause a buffer overflow.
751 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
752 addresses with arbitrary trailing characters, potentially leading to data
753 or command injection issues in applications.
755 The following bugs are resolved with this release:
757 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
758 [10496] localedata: 12h time representation in multiple locales faulty
759 [10797] localedata: it_IT locale numeric does not have a separator for
761 [11319] libc: dprintf doesn't handle errors properly
762 [16346] time: mktime: potentially unsafe use of localtime_offset
763 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
765 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
766 posix_spawn_file_actions_addfchdir_np
767 [17426] localedata: Indian locales: set the correct date format
768 [17490] stdio: popen should not invoke atfork handlers
769 [17783] libc: TIOCSER_TEMT conditions inconsistent
770 [18040] regex: use-after-free in regexec/get_subexp
771 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
772 [20018] network: getaddrinfo should reject IP addresses with trailing
773 characters (CVE-2016-10739)
774 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
775 [20271] libc: Missing "\n" in __libc_fatal calls
776 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
777 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
778 pointer argument is non-NULL
779 [21037] stdio: open_memstream and freopen
780 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
781 [21716] time: Crash in glibc's mktime in low-memory situations
782 [22834] stdio: Subprocess forked by popen may crash in Linux when
783 multithreads call popen
784 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
785 and pthread_create fails.
786 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
787 [23125] libc: riscv64: endless loop when throwing an exception from a
789 [23275] nptl: Race in pthread_mutex_lock while promoting to
790 PTHREAD_MUTEX_ELISION_NP.
791 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
793 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
795 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
797 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
798 [23509] dynamic-link: CET enabled glibc is incompatible with the older
800 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
801 [23521] nss: get_next_alias nss_files file stream leak
802 [23538] nptl: Hang in pthread_cond_broadcast
803 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
804 [23578] regex: Invalid memory access if regex pattern contains NUL byte
805 [23579] libc: Errors misreported in preadv2
806 [23597] build: support/test-container.c doesn't work with different
808 [23603] time: mktime signed integer overflow on large timestamps
809 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
810 [23614] libc: powerpc: missing CFI register information in __mpn_*
812 [23637] string: Generic strstr/strcasestr fails with huge needles
813 [23640] libc: no way to easily clear FD_CLOEXEC in
814 posix_spawn_file_actions_adddup2()
815 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
817 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
819 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
820 [23689] libc: Bug in documentation for rusage.ru_ixrss in
821 bits/types/struct_rusage.h
822 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
824 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
826 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
827 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
828 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
830 [23724] localedata: Albanian date formats are incorrect
831 [23735] math: libnldbl_nonshared.a references internal libm symbols
832 [23740] localedata: kl_GL: Month names and date formats need update
833 [23744] regex: regex refactorings to remove BE, avoid duplication
834 [23745] time: mktime fix for Gnulib + coreutils
835 [23758] time: Improve the width of alternate representation for year in
837 [23783] libc: [mips] Missing CMSPAR bits/termios.h
838 [23789] time: mktime does not set errno on failure
839 [23791] localedata: Wrong monetary format for ca_ES locale
840 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
841 [23794] locale: c16rtomb does not handle surrogate pairs
842 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
843 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
844 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
845 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
846 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
847 [23862] libc: [sh] missing kernel-features.h undefines
848 [23864] libc: [riscv] missing kernel-features.h undefines
849 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
850 [23907] malloc: Incorrect double-free malloc tcache check disregards
852 [23913] libc: off-by-one in function maybe_script_execute in
853 sysdeps/posix/spawni.c
854 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
855 [23923] locale: Add --no-hard-links option to localedef
856 [23927] network: Linux if_nametoindex() does not close descriptor
858 [23961] math: powf can overflow to inf without setting errno in non-
859 nearest rounding mode
860 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
861 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
862 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
863 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
864 [24011] localedata: Fixed small type in comment for locale bs_BA
865 [24018] libc: gettext() may return NULL
866 [24022] build: riscv build failure with Linux kernel 4.20-rc7
867 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
868 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
870 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
871 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
873 [24046] localedata: en_US locale doesn't define date_fmt
874 [24063] manual: @var{errno} should be @code{errno}
875 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
876 [24088] libc: VSCR field is not being correctly read in ucontext_t on
878 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
880 [24097] string: Can't use 64-bit register for size_t in assembly codes for
882 [24110] hurd: SS_DISABLE never set in stack_t value returned by
884 [24112] network: Do not send DNS queries for non-host names (where all
885 answers will be rejected)
886 [24130] libc: alpha __remqu corrupts $f3 register
893 * The localization data for ISO 14651 is updated to match the 2016
894 Edition 4 release of the standard, this matches data provided by
895 Unicode 9.0.0. This update introduces significant improvements to the
896 collation of Unicode characters. This release deviates slightly from
897 the standard in that the collation element ordering for lowercase and
898 uppercase LATIN script characters is adjusted to ensure that regular
899 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
900 is not matched by [a-z]. With the update many locales have been
901 updated to take advantage of the new collation information. The new
902 collation information has increased the size of the compiled locale
903 archive or binary locales.
905 * The GNU C Library can now be compiled with support for Intel CET, AKA
906 Intel Control-flow Enforcement Technology. When the library is built
907 with --enable-cet, the resulting glibc is protected with indirect
908 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
909 compatible with all existing executables and shared libraries. This
910 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
911 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
912 capable of multi-byte NOPs, like x86-64 processors as well as Intel
913 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
914 x86_64 and x32 on non-CET processors. --enable-cet has been tested
915 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
918 * The GNU C Library now has correct support for ABSOLUTE symbols
919 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
920 relocated incorrectly or in some cases discarded. The GNU linker can
921 make use of the newer semantics, but it must communicate it to the
922 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
923 field) to indicate such support is required.
925 * Unicode 11.0.0 Support: Character encoding, character type info, and
926 transliteration tables are all updated to Unicode 11.0.0, using
927 generator scripts contributed by Mike FABIAN (Red Hat).
929 * <math.h> functions that round their results to a narrower type are added
930 from TS 18661-1:2014 and TS 18661-3:2015:
932 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
935 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
938 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
941 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
944 * Two grammatical forms of month names are now supported for the following
945 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
946 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
947 support two grammatical forms in abbreviated month names: Catalan, Greek,
950 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
951 include the support for two grammatical forms of month names.
953 * Building and running on GNU/Hurd systems now works without out-of-tree
956 * The renameat2 function has been added, a variant of the renameat function
957 which has a flags argument. If the flags are zero, the renameat2 function
958 acts like renameat. If the flag is not zero and there is no kernel
959 support for renameat2, the function will fail with an errno value of
960 EINVAL. This is different from the existing gnulib function renameatu,
961 which performs a plain rename operation in case of a RENAME_NOREPLACE
962 flags and a non-existing destination (and therefore has a race condition
963 that can clobber the destination inadvertently).
965 * The statx function has been added, a variant of the fstatat64
966 function with an additional flags argument. If there is no direct
967 kernel support for statx, glibc provides basic stat support based on
968 the fstatat64 function.
970 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
971 library if installed. libidn2 version 2.0.5 or later is recommended. If
972 libidn2 is not available, internationalized domain names are not encoded
973 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
974 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
975 with an encoding error.) Flags which used to change the IDN encoding and
976 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
977 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
978 deprecated. They no longer have any effect.
980 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
981 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
982 range of ELF gABI expressions including such constructs as
983 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
984 have been further restricted, and where in the past a dynamic string
985 token sequence may have been interpreted as a literal string it will
986 now cause a load failure. These load failures were always considered
987 unspecified behaviour from the perspective of the dynamic loader, and
988 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
989 results in a load failure now.
991 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
992 implementation includes all the standard functions provided by
995 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
996 thrd_detach, thrd_exit, and thrd_join for thread management.
998 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
999 mtx_destroy for mutual exclusion.
1001 - call_once for function call synchronization.
1003 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1004 cnd_wait for conditional variables.
1006 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1008 Application developers must link against libpthread to use ISO C threads.
1010 Deprecated and removed features, and other changes affecting compatibility:
1012 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1013 installed. Software that was using either header should be updated to
1014 use standard <stdio.h> interfaces instead.
1016 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1017 This was never required by the C standard, and the macros just expanded
1018 to call alternative names for the same functions. If you hoped getc and
1019 putc would provide performance improvements over fgetc and fputc, instead
1020 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1021 necessary, flockfile and funlockfile.
1023 * All stdio functions now treat end-of-file as a sticky condition. If you
1024 read from a file until EOF, and then the file is enlarged by another
1025 process, you must call clearerr or another function with the same effect
1026 (e.g. fseek, rewind) before you can read the additional data. This
1027 corrects a longstanding C99 conformance bug. It is most likely to affect
1028 programs that use stdio to read interactive input from a terminal.
1031 * The macros 'major', 'minor', and 'makedev' are now only available from
1032 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1033 headers that happen to include <sys/types.h>. These macros are rarely
1034 used, not part of POSIX nor XSI, and their names frequently collide with
1035 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1036 further explanation.
1038 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1039 these macros should first include <sys/types.h>, and then include
1040 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1042 * The tilegx*-*-linux-gnu configurations are no longer supported.
1044 * The obsolete function ustat is no longer available to newly linked
1045 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1046 function has been deprecated in favor of fstatfs and statfs.
1048 * The obsolete function nfsservctl is no longer available to newly linked
1049 binaries. This function was specific to systems using the Linux kernel
1050 and could not usefully be used with the GNU C Library on systems with
1051 version 3.1 or later of the Linux kernel.
1053 * The obsolete function name llseek is no longer available to newly linked
1054 binaries. This function was specific to systems using the Linux kernel
1055 and was not declared in a header. Programs should use the lseek64 name
1056 for this function instead.
1058 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1059 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1060 previously selected by them is now always enabled.
1062 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1063 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1064 restriction (rejecting '_' in host names, among other things) has been
1065 removed, for increased compatibility with non-IDN name resolution.
1067 * The fcntl function now have a Long File Support variant named fcntl64. It
1068 is added to fix some Linux Open File Description (OFD) locks usage on non
1069 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1070 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1071 locks act as a cancellation entrypoint.
1073 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1074 ecb_crypt, and des_setparity are no longer available to newly linked
1075 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1076 longer installed. These functions encrypted and decrypted data with the
1077 DES block cipher, which is no longer considered secure. Software that
1078 still uses these functions should switch to a modern cryptography library,
1081 * Reflecting the removal of the encrypt and setkey functions above, the
1082 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1083 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1086 * The obsolete function fcrypt is no longer available to newly linked
1087 binaries. It was just another name for the standard function crypt,
1088 and it has not appeared in any header file in many years.
1090 * We have tentative plans to hand off maintenance of the passphrase-hashing
1091 library, libcrypt, to a separate development project that will, we hope,
1092 keep up better with new passphrase-hashing algorithms. We will continue
1093 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1094 'crypt_r' should not need to change at all; however, distributions will
1095 need to install <crypt.h> and libcrypt from a separate project.
1097 In this release, if the configure option --disable-crypt is used, glibc
1098 will not install <crypt.h> or libcrypt, making room for the separate
1099 project's versions of these files. The plan is to make this the default
1100 behavior in a future release.
1102 Changes to build and runtime requirements:
1104 GNU make 4.0 or later is now required to build glibc.
1106 Security related changes:
1108 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1109 been fixed by removing the glibc-internal IDNA implementation and using
1110 the system-provided libidn2 library instead. Originally reported by Hanno
1111 Böck and Christian Weisgerber.
1113 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1114 architecture could corrupt memory. Reported by Max Horn.
1116 CVE-2018-11236: Very long pathname arguments to realpath function could
1117 result in an integer overflow and buffer overflow. Reported by Alexey
1120 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1121 architecture could write beyond the target buffer, resulting in a buffer
1122 overflow. Reported by Andreas Schwab.
1124 The following bugs are resolved with this release:
1126 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1127 [6889] manual: 'PWD' mentioned but not specified
1128 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1129 when __WORDSIZE != 64
1130 [13762] regex: re_search etc. should return -2 on memory exhaustion
1131 [13888] build: /tmp usage during testing
1132 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1133 [14092] nptl: Support C11 threads
1134 [14095] localedata: Review / update collation data from Unicode / ISO
1136 [14508] libc: -Wformat warnings
1137 [14553] libc: Namespace pollution loff_t in sys/types.h
1138 [14890] libc: Make NT_PRFPREG canonical.
1139 [15105] libc: Extra PLT references with -Os
1140 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1142 [16335] manual: Feature test macro documentation incomplete and out of
1144 [16552] libc: Unify umount implementations in terms of umount2
1145 [17082] libc: htons et al.: statement-expressions prevent use on global
1146 scope with -O1 and higher
1147 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1148 [17438] localedata: pt_BR: wrong d_fmt delimiter
1149 [17662] libc: please implement binding for the new renameat2 syscall
1150 [17721] libc: __restrict defined as /* Ignore */ even in c11
1151 [17979] libc: inconsistency between uchar.h and stdint.h
1152 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1153 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1154 horrible machine code)
1155 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1157 [18471] libc: llseek should be a compat symbol
1158 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1160 [18991] nss: nss_files skips large entry in database
1161 [19239] libc: Including stdlib.h ends up with macros major and minor being
1163 [19463] libc: linknamespace failures when compiled with -Os
1164 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1165 [19527] locale: Normalized charset name not recognized by setlocale
1166 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1167 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1169 [19728] network: out of bounds stack read in libidn function
1170 idna_to_ascii_4i (CVE-2016-6261)
1171 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1172 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1173 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1175 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1176 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1177 [20419] dynamic-link: files with large allocated notes crash in
1179 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1180 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1181 [20980] manual: CFLAGS environment variable replaces vital options
1182 [21163] regex: Assertion failure in pop_fail_stack when executing a
1183 malformed regexp (CVE-2015-8985)
1184 [21234] manual: use of CFLAGS makes glibc detect no optimization
1185 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1186 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1187 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1188 [21508] locale: intl/tst-gettext failure with latest msgfmt
1189 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1190 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1191 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1193 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1195 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1196 [22247] network: Integer overflow in the decode_digit function in
1197 puny_decode.c in libidn (CVE-2017-14062)
1198 [22342] nscd: NSCD not properly caching netgroup
1199 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1200 [22550] localedata: es_ES locale (and other es_* locales): collation
1201 should treat ñ as a primary different character, sync the collation
1202 for Spanish with CLDR
1203 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1204 by gcc configured with --enable-default-pie
1205 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1206 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1207 crossing 2GB threshold (CVE-2017-18269)
1208 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1210 [22735] time: Misleading typo in time.h source comment regarding
1212 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1213 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1214 `__assert_perror_fail ()' to `__assert_fail_base ()'
1215 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1217 [22786] libc: Stack buffer overflow in realpath() if input size is close
1218 to SSIZE_MAX (CVE-2018-11236)
1219 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1220 through an absolute DT_NEEDED path
1221 [22792] build: tcb-offsets.h dependency dropped
1222 [22797] libc: pkey_get() uses non-reserved name of argument
1223 [22807] libc: PTRACE_* constants missing for powerpc
1224 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1225 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1226 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1227 [22848] localedata: ca_ES: update date definitions from CLDR
1228 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1229 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1230 [22896] localedata: Update locale data for an_ES
1231 [22902] math: float128 test failures with GCC 8
1232 [22918] libc: multiple common of `__nss_shadow_database'
1233 [22919] libc: sparc32: backtrace yields infinite backtrace with
1235 [22926] libc: FTBFS on powerpcspe
1236 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1238 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1239 [22947] libc: FAIL: misc/tst-preadvwritev2
1240 [22963] localedata: cs_CZ: Add alternative month names
1241 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1242 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1243 [22998] dynamic-link: execstack tests are disabled when SELinux is
1245 [23005] network: Crash in __res_context_send after memory allocation
1247 [23007] math: strtod cannot handle -nan
1248 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1249 [23036] regex: regex equivalence class regression
1250 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1251 [23069] libc: sigaction broken on riscv64-linux-gnu
1252 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
1253 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
1254 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
1255 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
1256 and libc build with -Os)
1257 [23140] localedata: More languages need two forms of month names
1258 [23145] libc: _init/_fini aren't marked as hidden
1259 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
1260 [23171] math: C++ iseqsig for long double converts arguments to double
1261 [23178] nscd: sudo will fail when it is run in concurrent with commands
1262 that changes /etc/passwd
1263 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
1265 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
1266 [23208] localedata: New locale - Lower Sorbian (dsb)
1267 [23233] regex: Memory leak in build_charclass_op function in file
1269 [23236] stdio: Harden function pointers in _IO_str_fields
1270 [23250] nptl: Offset of __private_ss differs from GCC
1271 [23253] math: tgamma test suite failures on i686 with -march=x86-64
1272 -mtune=generic -mfpmath=sse
1273 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
1275 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
1276 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
1278 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
1279 [23277] math: nan function should not have const attribute
1280 [23279] math: scanf and strtod wrong for some hex floating-point
1281 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
1283 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
1284 [23303] build: undefined reference to symbol
1285 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
1286 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
1288 [23313] stdio: libio vtables validation and standard file object
1290 [23329] libc: The __libc_freeres infrastructure is not properly run across
1292 [23349] libc: Various glibc headers no longer compatible with
1294 [23351] malloc: Remove unused code related to heap dumps and malloc
1296 [23363] stdio: stdio-common/tst-printf.c has non-free license
1297 [23396] regex: Regex equivalence regression in single-byte locales
1298 [23422] localedata: oc_FR: More updates of locale data
1299 [23442] build: New warning with GCC 8
1300 [23448] libc: Out of bounds access in IBM-1390 converter
1301 [23456] libc: Wrong index_cpu_LZCNT
1302 [23458] build: tst-get-cpu-features-static isn't added to tests
1303 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
1305 [23467] dynamic-link: x86/CET: A property note parser bug
1312 * The GNU C Library can now be compiled with support for building static
1313 PIE executables (See --enable-static-pie in INSTALL). These static PIE
1314 executables are like static executables but can be loaded at any address
1315 and provide additional security hardening benefits at the cost of some
1316 memory and performance. When the library is built with --enable-static-pie
1317 the resulting libc.a is usable with GCC 8 and above to create static PIE
1318 executables using the GCC option '-static-pie'. This feature is currently
1319 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
1320 aarch64 with binutils 2.30 or later.
1322 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
1323 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
1326 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
1328 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
1330 * In order to support faster and safer process termination the malloc API
1331 family of functions will no longer print a failure address and stack
1332 backtrace after detecting heap corruption. The goal is to minimize the
1333 amount of work done after corruption is detected and to avoid potential
1334 security issues in continued process execution. Reducing shutdown time
1335 leads to lower overall process restart latency, so there is benefit both
1336 from a security and performance perspective.
1338 * The abort function terminates the process immediately, without flushing
1339 stdio streams. Previous glibc versions used to flush streams, resulting
1340 in deadlocks and further data corruption. This change also affects
1341 process aborts as the result of assertion failures.
1343 * On platforms where long double has the IEEE binary128 format (aarch64,
1344 alpha, mips64, riscv, s390 and sparc), the math library now implements
1345 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
1346 These are the same interfaces added in version 2.26 for some platforms where
1347 this format is supported but is not the format of long double.
1349 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
1350 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
1351 implements interfaces for that type, as defined by ISO/IEC TS
1352 18661-3:2015. These are corresponding interfaces to those supported for
1355 * The math library now implements interfaces for the _Float32, _Float64 and
1356 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
1357 corresponding interfaces to those supported for _Float128.
1359 * glibc now implements the memfd_create and mlock2 functions on Linux.
1361 * Support for memory protection keys was added. The <sys/mman.h> header now
1362 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
1365 * The copy_file_range function was added.
1367 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
1369 * The ldconfig utility now processes `include' directives using the C/POSIX
1370 collation ordering. Previous glibc versions used locale-specific
1371 ordering, the change might break systems that relied on that.
1373 * Support for two grammatical forms of month names has been added.
1374 In a call to strftime, the "%B" and "%b" format specifiers will now
1375 produce the grammatical form required when the month is used as part
1376 of a complete date. New "%OB" and "%Ob" specifiers produce the form
1377 required when the month is named by itself. For instance, in Greek
1378 and in many Slavic and Baltic languages, "%B" will produce the month
1379 in genitive case, and "%OB" will produce the month in nominative case.
1381 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
1382 are all valid and will all accept any known form of month
1383 name---standalone or complete, abbreviated or full. In a call to
1384 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
1385 the strings used by "%B" and "%b", respectively. New query
1386 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
1387 used by "%OB" and "%Ob", respectively.
1389 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
1390 define the strings for %OB and %Ob, respectively; these have the
1391 same syntax as "mon" and "abmon". These arrays are optional; if they
1392 are not provided then they have the same content as "mon" and "abmon",
1395 These features are provided for locales which define "alt_mon" and/or
1396 "ab_alt_mon" in their locale source data. This release includes such
1397 alternative month name data for the following languages: Belarusian,
1398 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
1400 This feature is currently a GNU extension, but it is expected to
1401 be added to the next revision of POSIX, and it is also already
1402 available on some BSD-derived operating systems.
1404 This feature will cause existing statically compiled applications
1405 to fail to load locales and fall back to the builtin C/POSIX locales.
1406 See notes below for other changes affecting compatibility.
1408 * Support for the RISC-V ISA running on Linux has been added. This port
1409 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
1410 for the following ISA and ABI pairs:
1416 Deprecated and removed features, and other changes affecting compatibility:
1418 * Statically compiled applications attempting to load locales compiled for the
1419 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
1420 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
1421 support for two grammatical forms of the month names, also extends the locale
1422 data binary format. Static applications needing locale support must be
1423 recompiled to match the runtime and data they are deployed with. In some
1424 distributions there is an upgrade window where dynamically linked applications
1425 may use a new library but the old locale data and also fall back to the
1426 builtin C/POSIX locales; restarting the application process is sufficient to
1429 * Support for statically linked applications which call dlopen is deprecated
1430 and will be removed in a future version of glibc. Applications which call
1431 dlopen need to be linked dynamically instead.
1433 * Support for old programs which use internal stdio data structures and
1434 functions is deprecated. This includes programs which use the C++ streams
1435 provided by libstdc++ in GCC 2.95. Programs which use the internal
1436 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
1437 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
1438 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
1439 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
1440 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
1441 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
1442 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
1443 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
1444 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
1445 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
1446 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
1447 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
1448 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
1449 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
1450 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
1451 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
1452 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
1453 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
1454 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
1455 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
1456 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
1457 future version of glibc. Unlike other symbol removals, these old
1458 applications will not be supported using compatibility symbols.
1460 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
1461 defined by <sys/ptrace.h>.
1463 * libm no longer supports SVID error handling (calling a user-provided
1464 matherr function on error) or the _LIB_VERSION variable to control error
1465 handling. (SVID error handling and the _LIB_VERSION variable still work
1466 for binaries linked against older versions of the GNU C Library.) The
1467 libieee.a library is no longer provided. math.h no longer defines struct
1468 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
1469 TLOSS, PLOSS and HUGE.
1471 * The libm functions pow10, pow10f and pow10l are no longer supported for
1472 new programs. Programs should use the standard names exp10, exp10f and
1473 exp10l for these functions instead.
1475 * The mcontext_t type is no longer the same as struct sigcontext. On
1476 platforms where it was previously the same, this changes the C++ name
1477 mangling for interfaces involving this type.
1479 * The add-ons mechanism for building additional packages at the same time as
1480 glibc has been removed. The --enable-add-ons configure option is now
1483 * The --without-fp configure option is now ignored. Whether hardware
1484 floating-point instructions are used is now configured based on whether
1485 the compiler used at configure time (without any options implied by a
1486 --with-cpu= configure option) uses such instructions.
1488 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
1489 the specified string can be parsed as a domain name.
1491 * In the malloc_info output, the <heap> element may contain another <aspace>
1492 element, "subheaps", which contains the number of sub-heaps.
1494 * The libresolv function p_secstodate is no longer supported for new
1497 * The tilepro-*-linux-gnu configuration is no longer supported.
1499 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
1500 and will be removed in a future release. Software that is still using
1501 either header should be updated to use standard <stdio.h> interfaces
1504 libio.h was originally the header for a set of supported GNU extensions,
1505 but they have not been maintained as such in many years, they are now
1506 standing in the way of improvements to stdio, and we don't think there are
1507 any remaining external users. _G_config.h was never intended for public
1508 use, but predates the bits convention.
1510 Changes to build and runtime requirements:
1512 * bison version 2.7 or later is required to generate code in the 'intl'
1515 Security related changes:
1517 CVE-2009-5064: The ldd script would sometimes run the program under
1518 examination directly, without preventing code execution through the
1519 dynamic linker. (The glibc project disputes that this is a security
1520 vulnerability; only trusted binaries must be examined using the ldd
1523 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
1524 suffered from a one-byte overflow during ~ operator processing (either
1525 on the stack or the heap, depending on the length of the user name).
1526 Reported by Tim Rühsen.
1528 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1529 would sometimes fail to free memory allocated during ~ operator
1530 processing, leading to a memory leak and, potentially, to a denial
1533 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1534 without GLOB_NOESCAPE, could write past the end of a buffer while
1535 unescaping user names. Reported by Tim Rühsen.
1537 CVE-2017-17426: The malloc function, when called with an object size near
1538 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1539 instead of NULL. This was a regression introduced with the new malloc
1540 thread cache in glibc 2.26. Reported by Iain Buclaw.
1542 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1543 to the allocation of too much memory. (This is not a security bug per se,
1544 it is mentioned here only because of the CVE assignment.) Reported by
1547 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1548 of the number of search path components. (This is not a security
1549 vulnerability per se because no trust boundary is crossed if the fix for
1550 CVE-2017-1000366 has been applied, but it is mentioned here only because
1551 of the CVE assignment.) Reported by Qualys.
1553 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1554 for AT_SECURE or SUID binaries could be used to load libraries from the
1557 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1558 succeeds without returning an absolute path due to unexpected behaviour
1559 of the Linux kernel getcwd syscall. Reported by halfdog.
1561 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1562 an object size near the value of SIZE_MAX, would return a pointer to a
1563 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1565 CVE-2018-6551: The malloc function, when called with an object size near
1566 the value of SIZE_MAX, would return a pointer to a buffer which is too
1567 small, instead of NULL.
1569 The following bugs are resolved with this release:
1571 [866] glob: glob should match dangling symlinks
1572 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1573 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1575 [5997] math: Very slow execution of sinf function
1576 [10580] localedata: hr_HR: updated locale
1577 [10871] locale: 'mon' array should contain both nominative and genitive
1579 [12349] localedata: eu_ES: incorrect thousands separator
1580 [13605] localedata: shn_MM: new Shan locale
1581 [13805] localedata: ru_RU: currency should use ',' as radix point
1582 [13953] localedata: km_KH: locale update
1583 [13994] localedata: mjw_IN: new locale
1584 [14121] build: make writes .mo files in po directory
1585 [14333] libc: Fix the race between atexit() and exit()
1586 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1587 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1589 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1590 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1591 width Latin characters
1592 [15332] localedata: es_CU: locale update
1593 [15436] stdio: Don't close or flush stdio streams on abort
1594 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1596 [16148] localedata: ca_ES: incorrect thousands separator
1597 [16750] dynamic-link: ldd should not try to execute the binaries
1599 [16777] localedata: pl_PL: incorrect thousands separator in locale
1600 [16905] localedata: hanzi: new collation
1601 [17563] localedata: cmn_TW: add hanzi collation
1602 [17750] localedata: wrong collation order of diacritics in most locales
1603 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1605 [17956] build: Build fails on missing definitions from header file
1606 nss/nss.h when Mozilla NSS is used for cryptography
1607 [18203] libc: realpath() does not handle unreachable paths correctly
1608 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1609 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1610 [18822] libc: Internal functions are called via PLT
1611 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1612 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1613 [19574] libc: glibc should support building static PIE binaries
1614 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1616 [19971] glob: glob: Do not skip entries with zero d_ino values
1617 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1618 [20008] localedata: km_KH: convert to translit_neutral
1619 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1620 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1621 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1622 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1623 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
1625 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1626 they're set, wrong errors returned by gaih_inet when lookup functions
1628 [20756] localedata: [PATCH] Use Unicode wise thousands separator
1629 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1631 [20952] localedata: yuw_PG: new locale
1632 [21084] localedata: charmaps/IBM858: new codepage
1633 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1634 [21242] libc: assert gives pedantic warning in old gcc versions
1635 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1636 __regcall calling convention
1637 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1638 [21326] libc: C99 functions are not declared for C++11 and later if
1639 _GNU_SOURCE is not predefined by g++
1640 [21457] libc: sys/ucontext.h namespace
1641 [21530] libc: tmpfile() should be implemented using O_TMPFILE
1642 [21660] math: GCC fails to compile a formula with tgmath.h
1643 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1644 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1645 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1646 [21684] math: tgmath.h handling of complex integers
1647 [21685] math: tgmath.h handling of bit-fields
1648 [21686] math: tgmath.h handling of __int128
1649 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1651 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1653 [21750] localedata: column width of characters incompatible with classical
1655 [21754] malloc: malloc: Perform as little work as possible after heap
1656 consistency check failures
1657 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1658 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1659 [21791] string: Unused XXX_chk_XXX functions in libc.a
1660 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1662 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1664 [21845] localedata: Added new Locale bho_NP
1665 [21853] localedata: Fix abday Which looks same as day in zh_SG
1666 [21854] localedata: Added New Locale en_SC
1667 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1668 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1669 _dl_runtime_resolve_avx_slow
1670 [21885] network: getaddrinfo: gethosts does not release resolver context
1671 on memory allocation failure
1672 [21899] libc: XPG4.2 sigaction namespace
1673 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1675 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1677 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1678 errno value, causing getaddrinfo to fail
1679 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1680 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1681 instead of EAI_NODATA
1682 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1683 constant PTRACE_SEIZE_DEVEL
1684 [21930] math: C-only gcc builtins used in <math.h> isinf
1685 [21932] network: Unpaired __resolv_context_get in generic get*_r
1687 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1688 [21944] libc: sigval namespace
1689 [21951] localedata: Update hanzi collation by stroke
1690 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
1691 sysdeps/x86_64/fpu/e_expf.S
1692 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1693 allocation in syscall loops)
1694 [21959] localedata: Fix Country name for xh_ZA
1695 [21960] localedata: Fix abmon for bem_ZM
1696 [21966] math: AVX2 mathvec functions use FMA without checking
1697 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1698 [21971] localedata: Added New Locale for mfe_MU
1699 [21972] libc: assert macro requires operator== (int) for its argument type
1700 [21973] math: [sparc] libm missing sqrtl compat symbol
1701 [21974] libc: Remove __bb_init_func and __bb_exit_func
1702 [21982] string: stratcliff.c: error: assuming signed overflow does not
1704 [21986] stdio: __guess_grouping is called incorrectly
1705 [21987] math: [sparc32] wrong bits/long-double.h installed
1706 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1708 [22022] localedata: Missing country_name for mni_IN
1709 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1711 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1713 [22026] locale: iconv_open: heap overflow on gconv_init failure
1714 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1715 [22035] math: [m68k] bits/math-inline.h macro namespace
1716 [22038] localedata: Fix abbreviated weeks and months for Somali
1717 [22044] localedata: Remove redundant data for Limburgish Language
1718 [22050] malloc: Linking with -lmcheck does not hook
1719 __malloc_initialize_hook correctly
1720 [22051] libc: zero terminator in the middle of glibc's .eh_frame
1721 [22052] malloc: malloc failed to compile with GCC 7 and -O3
1722 [22070] localedata: charmaps/UTF-8: wcwidth for
1723 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1724 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1725 Jungseong and Jongseong) should be 0
1726 [22078] nss: nss_files performance issue in multi mode
1727 [22082] math: bits/math-finite.h exp10 condition
1728 [22086] libc: pcprofiledump incorrect cross-endian condition
1729 [22093] dynamic-link: ld.so no longer searches in .../x86_64
1730 [22095] network: Name server address allocation memory leak in resolv.conf
1732 [22096] network: __resolv_conf_attach can incorrectly free passed conf
1734 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1735 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1737 [22111] malloc: malloc: per thread cache is not returned when thread exits
1738 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1739 [22134] libc: [linux] implement fexecve with execveat
1740 [22142] libc: [powerpc] printf oupts a wrong value of DBL_MAX on ppc64 and
1742 [22145] libc: ttyname() gives up too early in the face of namespaces
1743 [22146] math: C++ build issue with float128 on x86_64
1744 [22153] nptl: nptl: save error code before process termination
1745 [22156] libc: [hppa,ia64,microblaze] Executable stack default
1746 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1747 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1748 [22165] libc: [hppa] Text relocations in libc.so
1749 [22180] libc: destructor registered via __cxa_atexit is called twice
1750 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1751 symlinks") cause "make" segfaults
1752 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1754 [22207] libc: FAIL: stdlib/test-atexit-race
1755 [22225] math: nearbyint arithmetic moved before feholdexcept
1756 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1757 [22235] math: iscanonical in C++ and float128
1758 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1759 the svid compat wrapper
1760 [22244] math: ynf and yn are wrong without the svid compat wrapper
1761 [22273] libc: Improper assert in Linux posix_spawn implementation
1762 [22284] libc: -pg -pie doesn't work
1763 [22292] locale: localedef exits with error 4 when it should be error 1
1764 [22294] locale: Allow "" for int_currency_symbol definition in locales.
1765 [22295] locale: Don't warn on non-symbolic characters in locale sources in
1767 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1768 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1770 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1771 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1772 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1773 [22322] libc: [mips64] wrong bits/long-double.h installed
1774 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1775 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1777 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1778 [22343] malloc: Integer overflow in posix_memalign
1779 [22347] libc: getrandom() returns the number of bytes that were copied to
1780 the buffer even though the comments say "Return 0 on success and -1 on
1782 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1783 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1785 [22370] dynamic-link: Incorrect note padding check
1786 [22375] libc: malloc returns pointer from tcache_get when should return
1787 NULL (CVE-2017-17426)
1788 [22377] math: iseqsig, float128 and C++
1789 [22382] localedata: Error in tpi_PG locale
1790 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1791 inside the ASCII printable range
1792 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1794 [22403] localedata: Slash needs escaping in some locales
1795 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1796 [22409] network: res_hnok does not accept some host names used on the
1798 [22412] network: res_dnok, res_hnok should perform syntax checks
1799 [22413] network: ns_name_pton ignores syntactically invalid trailing
1801 [22415] stdio: setvbuf can lead to invalid free/segfault
1802 [22432] build: Non-deterministic build
1803 [22439] malloc: malloc_info should compute summary statistics for all sub-
1805 [22442] network: if_nametoindex could report index for the wrong
1806 networking interface
1807 [22446] build: aliasing violation calling readlink in handle_request
1808 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
1809 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
1810 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
1811 __nscd_hash/__nss_hash
1812 [22463] network: p_secstodate overflow handling
1813 [22469] localedata: pl_PL LC_COLLATE does not use i18n
1814 [22478] libc: sigwait can fail with EINTR
1815 [22505] libc: ldconfig processes include directive in locale-specific
1817 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
1818 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
1819 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
1820 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
1821 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
1822 [22534] localedata: Collation rules for Serbian and Bosnian should be the
1823 same as for Croatian
1824 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
1825 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
1826 [22577] libc: missing newline after "cannot allocate TLS data structures
1828 [22588] manual: manual/conf.texi: missing underscore in front of
1830 [22593] math: nextafter and nexttoward are declared with const attribute
1831 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
1832 [22603] string: ia64 memchr overflows internal pointer check
1833 [22605] libc: SH clone does not set the exit code correctly
1834 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
1836 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
1837 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
1838 modified in case of success
1839 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
1840 [22615] manual: manual: ambiguous wording about errno value in case of
1842 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
1844 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
1845 binaries or if /proc is not mounted (CVE-2017-16997)
1846 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
1847 [22630] build: $(no-pie-ldflag) is no longer effective
1848 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
1849 [22635] nptl: pthread_self returns NULL before libpthread is loaded
1850 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
1851 [22637] nptl: guard size is subtracted from thread stack size instead of
1853 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
1854 [22657] localedata: hu_HU: Avoid double space in date
1855 [22660] math: fmax, fmin sNaN handling on alpha
1856 [22664] libc: New warning of GCC8
1857 [22665] math: alpha: ceil and floor raise inexact exceptions
1858 [22666] math: alpha: trunc raise inexact exceptions
1859 [22667] libc: makecontext lacks stack alignment on i386
1860 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
1861 [22679] libc: getcwd(3) can succeed without returning an absolute path
1863 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
1864 elision and tunables
1865 [22687] math: [powerpc-nofpu] complex long double functions spurious
1867 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
1868 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
1869 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
1871 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
1872 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
1874 [22701] nis: Incomplete removal of libnsl
1875 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
1876 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
1877 [22715] dynamic-link: FAIL: elf/tst-audit10
1878 [22719] libc: Backtrace tests fail on hppa
1879 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
1880 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
1881 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
1882 before the first call to crypt_r () in crypt/badsalttest.c
1889 * A per-thread cache has been added to malloc. Access to the cache requires
1890 no locks and therefore significantly accelerates the fast path to allocate
1891 and free small amounts of memory. Refilling an empty cache requires locking
1892 the underlying arena. Performance measurements show significant gains in a
1893 wide variety of user workloads. Workloads were captured using a special
1894 instrumented malloc and analyzed with a malloc simulator. Contributed by
1895 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
1897 * Unicode 10.0.0 Support: Character encoding, character type info, and
1898 transliteration tables are all updated to Unicode 10.0.0, using
1899 generator scripts contributed by Mike FABIAN (Red Hat).
1900 These updates cause user visible changes, especially the changes in
1901 wcwidth for many emoji characters cause problems when emoji sequences
1902 are rendered with pango, see for example:
1903 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
1905 * Collation of Hungarian has been overhauled and is now consistent with "The
1906 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
1909 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
1911 - The GNU C Library will now detect when /etc/resolv.conf has been
1912 modified and reload the changed configuration. The new resolver option
1913 “no-reload” (RES_NORELOAD) disables this behavior.
1915 - The GNU C Library now supports an arbitrary number of search domains
1916 (configured using the “search” directive in /etc/resolv.conf);
1917 previously, there was a hard limit of six domains. For backward
1918 compatibility, applications that directly modify the ‘_res’ global
1919 object are still limited to six search domains.
1921 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
1922 Library will now randomly pick a name server from the configuration as a
1923 starting point. (Previously, the second name server was always used.)
1925 * The tunables feature is now enabled by default. This allows users to tweak
1926 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
1928 * New function reallocarray, which resizes an allocated block (like realloc)
1929 to the product of two sizes, with a guaranteed clean failure upon integer
1930 overflow in the multiplication. Originally from OpenBSD, contributed by
1931 Dennis Wölfing and Rüdiger Sonderfeld.
1933 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
1934 These are extended versions of preadv and pwritev, respectively, taking an
1935 additional flags argument. The set of supported flags depends on the
1936 running kernel; full support currently requires kernel 4.7 or later.
1938 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
1939 create a new session ID for the spawned process. This feature is
1940 scheduled to be added to the next major revision of POSIX; for the time
1941 being, it is available under _GNU_SOURCE.
1943 * errno.h is now safe to use from C-preprocessed assembly language on all
1944 supported operating systems. In this context, it will only define the
1945 Exxxx constants, as preprocessor macros expanding to integer literals.
1947 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
1948 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
1949 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
1950 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
1952 To compile programs that use this feature, the compiler must support
1953 128-bit floating point with the type name _Float128 (as defined by TS
1954 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
1955 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
1956 must be defined to make the new interfaces visible.
1958 The new functions and macros correspond to those present for other
1959 floating-point types (except for a few obsolescent interfaces not
1960 supported for the new type), with F128 or f128 suffixes; for example,
1961 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
1962 printf or scanf formats for the new type; the strfromf128 and strtof128
1963 interfaces should be used instead.
1965 Deprecated and removed features, and other changes affecting compatibility:
1967 * The synchronization that pthread_spin_unlock performs has been changed to
1968 now be equivalent to a C11 atomic store with release memory order to the
1969 spin lock's memory location. Previously, several (but not all)
1970 architectures used stronger synchronization (e.g., containing what is
1971 often called a full barrier). This change can improve performance, but
1972 may affect odd fringe uses of spin locks that depend on the previous
1973 behavior (e.g., using spin locks as atomic variables to try to implement
1974 Dekker's mutual exclusion algorithm).
1976 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
1979 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
1980 will only be built and installed when the GNU C Library is configured with
1981 --enable-obsolete-rpc. This allows alternative RPC implementations, such
1982 as TIRPC or rpcsvc-proto, to be used.
1984 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
1985 libnss_compat, are deprecated, and will not be built or installed by
1988 The NIS(+) support library, libnsl, is also deprecated. By default, a
1989 compatibility shared library will be built and installed, but not headers
1990 or development libraries. Only a few NIS-related programs require this
1991 library. (In particular, the GNU C Library has never required programs
1992 that use 'gethostbyname' to be linked with libnsl.)
1994 Replacement implementations based on TIRPC, which additionally support
1995 IPv6, are available from <https://github.com/thkukuk/>. The configure
1996 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
1997 name service modules, to be built and installed.
1999 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2000 support is enabled, the configured recursive resolver must support EDNS.
2001 (Responding to EDNS-enabled queries with responses which are not
2002 EDNS-enabled is fine, but FORMERR responses are not.)
2004 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2005 servers have not supported this opcode for a long time.
2007 * The _res_opcodes variable has been removed from libresolv. It had been
2008 exported by accident.
2010 * <string.h> no longer includes inline versions of any string functions,
2011 as this kind of optimization is better done by the compiler. The macros
2012 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2014 * The nonstandard header <xlocale.h> has been removed. Most programs should
2015 use <locale.h> instead. If you have a specific need for the definition of
2016 locale_t with no other declarations, please contact
2017 libc-alpha@sourceware.org and explain.
2019 * The obsolete header <sys/ultrasound.h> has been removed.
2021 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2023 * The obsolete function cfree has been removed. Applications should use
2026 * The stack_t type no longer has the name struct sigaltstack. This changes
2027 the C++ name mangling for interfaces involving this type.
2029 * The ucontext_t type no longer has the name struct ucontext. This changes
2030 the C++ name mangling for interfaces involving this type.
2032 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2033 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2034 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2035 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2036 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2037 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2038 fpregset_t type no longer has the name struct fpu. This changes the C++
2039 name mangling for interfaces involving those types.
2041 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2042 synced with the kernel:
2044 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2045 are not supported on this architecture and have been removed.
2047 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2048 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2049 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2051 Programs that assume the GET/SETREGS ptrace requests are universally
2052 available will now fail to build, instead of malfunctioning at runtime.
2054 Changes to build and runtime requirements:
2056 * Linux kernel 3.2 or later is required at runtime, on all architectures
2057 supported by that kernel. (This is a change from version 2.25 only for
2060 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2062 * On most architectures, GCC 4.9 or later is required to build the GNU C
2063 Library. On powerpc64le, GCC 6.2 or later is required.
2065 Older GCC versions and non-GNU compilers are still supported when
2066 compiling programs that use the GNU C Library. (We do not know exactly
2067 how old, and some GNU extensions to C may be _de facto_ required. If you
2068 are interested in helping us make this statement less vague, please
2069 contact libc-alpha@sourceware.org.)
2071 Security related changes:
2073 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2074 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2076 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2077 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2079 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2080 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2083 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2084 fixed (CVE-2017-12133).
2086 The following bugs are resolved with this release:
2088 [984] network: Respond to changed resolv.conf in gethostbyname
2089 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2090 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2092 [12189] libc: __stack_chk_fail should not attempt a backtrace
2094 [14096] time: Race condition on timezone/tst-timezone.out
2095 [14172] localedata: az_IR: new locale
2096 [14995] build: glibc fails to build if gold is the default linker, even if
2098 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2099 [16637] network: inet_pton function is accepting IPv6 with bad format
2100 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2101 x86 and other generic code
2102 [16875] localedata: ko_KR: fix lang_name
2103 [17225] localedata: ar_SY: localized month names for May and June are
2105 [17297] localedata: da_DK: wrong date_fmt string
2106 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2107 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2108 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2109 [19066] localedata: ar_SA abbreviated day and month names are in English
2110 [19569] network: resolv: Support an arbitrary number of search domains
2111 [19570] network: Implement random DNS server selection in the stub
2113 [19838] locale: localedef fails on PA-RISC
2114 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2115 order of 0D36 and 0D37
2116 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2118 [20098] libc: FAIL: debug/backtrace-tst on hppa
2119 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2121 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2123 [20313] localedata: Update locale data to Unicode 9.0
2124 [20424] manual: Document how to provide a malloc replacement
2125 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2127 [20686] locale: Add el_GR@euro to SUPPORTED.
2128 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2129 failures consistently
2130 [21015] dynamic-link: Document and fix --enable-bind-now
2131 [21016] nptl: pthread_cond support is broken on hppa
2132 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2133 frame-pointer on i386
2134 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2136 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2137 [21088] libc: Build fails with --enable-static-nss
2138 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2139 generic c code is used
2140 [21109] libc: Tunables broken on big-endian
2141 [21112] math: powf has large ulp errors with base close to 1 and exponent
2143 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2145 [21120] malloc: glibc malloc is incompatible with GCC 7
2146 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2148 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2149 (-0.0) when linking with -lieee
2150 [21171] math: log10, log2 and lgamma return incorrect results
2151 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2152 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2153 [21207] localedata: ce_RU: update weekdays from CLDR
2154 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2155 [21217] localedata: Update months from CLDR-31
2156 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2157 [21243] libc: support_delete_temp_file should issue warning for failed
2159 [21244] libc: support resolv_test_start() socket fd close should be
2161 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2162 new posix_spawn implementation
2163 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2164 leads to lower CPU frequency
2165 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2166 [21261] libc: [sparc64] bits/setjmp.h namespace
2167 [21267] network: [mips] bits/socket.h IOC* namespace
2168 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2169 [21270] libc: mmap64 silently truncates large offset values
2170 [21275] libc: posix_spawn always crashes on ia64 now
2171 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2172 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2173 [21289] libc: Incorrect declaration for 32-bit platforms with
2174 _FILE_OFFSET_BITS=64 causes build error
2175 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2176 not support gethostbyname4_r
2177 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2179 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2181 [21340] libc: Support POSIX_SPAWN_SETSID
2182 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2183 [21359] network: ns_name_pack needs additional byte in destination buffer
2184 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2185 against fragmentation attacks (CVE-2017-12132)
2186 [21369] network: resolv: Remove EDNS fallback
2187 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2189 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2190 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2191 [21393] stdio: Missing dup3 error check in freopen, freopen64
2192 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2193 [21399] localedata: Bad description for U00EC in
2194 localedata/charmaps/CP1254
2195 [21411] malloc: realloc documentation error
2196 [21426] network: sys/socket.h uio.h namespace
2197 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2198 [21445] libc: signal.h bsd_signal namespace
2199 [21455] network: Network headers stdint.h namespace
2200 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2202 [21475] network: resolv: Overlong search path is truncated mid-label
2203 [21511] libc: sigstack namespace
2204 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2205 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2206 bits/syscall.h: No such file or directory
2207 [21517] libc: struct sigaltstack namespace
2208 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2209 [21533] localedata: Update locale data to Unicode 10.0
2211 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2212 junk at end of line, first unrecognized character is `@'
2213 [21538] libc: SIG_HOLD missing for XPG4
2214 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2215 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2216 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2217 [21543] libc: sigevent namespace
2218 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2219 size for general purpose registers in mcontext_t structure
2220 [21550] libc: sigwait namespace
2221 [21552] libc: XPG4 bsd_signal namespace
2222 [21554] libc: sigpause namespace
2223 [21560] libc: sys/wait.h signal.h namespace
2224 [21561] libc: waitid namespace
2225 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2226 '/usr/include/stdlib.h': Permission denied
2227 [21575] libc: sys/wait.h missing struct rusage definition
2228 [21584] libc: sigaltstack etc namespace
2229 [21597] libc: siginterrupt namespace
2230 [21607] math: hppa: FAIL: math/test-tgmath
2231 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2233 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2234 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2235 stack and heap (CVE-2017-1000366)
2236 [21625] libc: wait3 namespace
2237 [21654] nss: Incorrect pointer alignment in NSS group merge result
2239 [21657] network: Parse interface zone id for node-local multicast
2240 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2242 [21666] libc: .symver is used on common symbol
2243 [21668] network: resolv: res_init cross-thread broadcast introduces race
2245 [21687] math: tgmath.h totalorder, totalordermag return type
2246 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2248 [21696] libc: Incorrect assumption of of __cpu_mask in
2249 posix/sched_cpucount.c
2250 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2251 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2253 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
2254 leading to relocation crash
2255 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
2256 `resolv_conf_matches (resp, conf)' failed.
2257 [21710] localedata: Added Samoan language locale for Samoa
2258 [21711] localedata: Pashto yesstr/nostr locale are missing
2259 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
2260 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
2261 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
2262 [21723] localedata: yesstr/nostr missing for Chinese language locale
2263 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
2265 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
2267 [21728] localedata: New Locale for Tongan language
2268 [21729] localedata: incorrect LC_NAME fields for hi_IN
2269 [21733] localedata: yesstr and nostr are missing for zh_HK
2270 [21734] localedata: Missing yesstr and nostr are for kw_GB
2271 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
2272 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
2273 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
2274 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
2276 [21744] libc: Tests failing on --enable-tunables --enable-stack-
2278 [21749] localedata: Wrong abbreviated day name (“abday”) for
2280 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
2281 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
2282 [21759] localedata: missing yesstr and nostr for Tigrinya
2283 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
2284 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
2285 [21767] localedata: Missing Bislama locales
2286 [21768] localedata: Missing yesstr and nostr for aa_ET
2287 [21770] localedata: Missing Field in li_NL
2288 [21778] nptl: Robust mutex may deadlock
2289 [21779] libc: MicroBlaze segfaults when loading libpthread
2290 [21783] localedata: Fix int_select international_call_prefixes
2291 [21784] localedata: Inconsistency in country_isbn
2292 [21788] localedata: Missing Country Postal Abbreviations
2293 [21794] localedata: Added-country_isbn-for-Italy
2294 [21795] localedata: Add/Fix country_isbn for France
2295 [21796] localedata: Added country_isbn for Republic of Korea
2296 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
2297 [21799] localedata: Added int_select international_call_prefixes
2298 [21801] localedata: Added int_select international_call_prefixes
2299 [21804] nptl: Double semicolon in thread-shared-types.h
2300 [21807] localedata: LC_ADDRESS fix for pap_CW
2301 [21808] localedata: Fix LC_ADDRESS for pap_AW
2302 [21821] localedata: Added country_name in mai_IN
2303 [21822] localedata: Fix LC_TIME for mai_IN
2304 [21823] localedata: missing yesstr, nostr for sa_IN
2305 [21825] localedata: Fix name_mrs for mag_IN
2306 [21828] localedata: 2.26 changelog should mention user visible changes
2308 [21835] localedata: Added Maithili language locale for Nepal
2309 [21838] localedata: Removed redundant data for the_NP
2310 [21839] localedata: Fix LC_MONETARY for ta_LK
2311 [21844] localedata: Fix Latin characters and Months Sequence.
2312 [21848] localedata: Fix mai_NP Title Name
2317 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
2318 24731-2:2010, is supported to enable declarations of functions from that
2319 TR. Note that not all functions from that TR are supported by the GNU C
2322 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
2323 18661-1:2014, is supported to enable declarations of functions and macros
2324 from that TS. Note that not all features from that TS are supported by
2327 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
2328 18661-4:2015, is supported to enable declarations of functions and macros
2329 from that TS. Note that most features from that TS are not supported by
2332 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
2333 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
2334 Since the GNU C Library defaults to a much newer revision of POSIX, this
2335 will only affect programs that specifically request an old conformance
2336 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
2337 see a change in the visible declarations, but a program compiled with
2338 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
2341 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
2342 defined by all multithreaded code, but glibc has not required this for
2345 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
2346 means that in a future release, the macros “major”, “minor”, and “makedev”
2347 will only be available from <sys/sysmacros.h>.
2349 These macros are not part of POSIX nor XSI, and their names frequently
2350 collide with user code; see for instance glibc bug 19239 and Red Hat bug
2351 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
2352 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
2355 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
2356 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
2357 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
2359 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
2360 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
2361 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
2362 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
2363 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
2364 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
2365 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
2366 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
2367 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
2368 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
2369 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
2372 * New <math.h> features are added from TS 18661-1:2014:
2374 - Signaling NaN macros: SNANF, SNAN, SNANL.
2376 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
2377 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
2378 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
2380 - llogb functions: the llogb, llogbf and llogbl functions, and the
2381 FP_LLOGB0 and FP_LLOGBNAN macros.
2383 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
2386 - Comparison macros: iseqsig.
2388 - Classification macros: iscanonical, issubnormal, iszero.
2390 - Total order functions: totalorder, totalorderf, totalorderl,
2391 totalordermag, totalordermagf, totalordermagl.
2393 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
2395 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
2396 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
2398 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
2399 are added to libc. They convert a floating-point number into string.
2401 * Most of glibc can now be built with the stack smashing protector enabled.
2402 It is recommended to build glibc with --enable-stack-protector=strong.
2403 Implemented by Nick Alcock (Oracle).
2405 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
2406 intended to be used instead of memset() to erase sensitive data after use;
2407 the compiler will not optimize out calls to explicit_bzero even if they
2408 are "unnecessary" (in the sense that no _correct_ program can observe the
2409 effects of the memory clear).
2411 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
2412 to float instead of double. This does not affect the ABI of any libraries
2413 that are part of the GNU C Library, but may affect the ABI of other
2414 libraries that use this type in their interfaces.
2416 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
2417 float_t and double_t types are now defined to long double instead of float
2418 and double. These options are not the default, and this does not affect
2419 the ABI of any libraries that are part of the GNU C Library, but it may
2420 affect the ABI of other libraries that use this type in their interfaces,
2421 if they are compiled or used with those options.
2423 * The getentropy and getrandom functions, and the <sys/random.h> header file
2426 * The buffer size for byte-oriented stdio streams is now limited to 8192
2427 bytes by default. Previously, on Linux, the default buffer size on most
2428 file systems was 4096 bytes (and thus remains unchanged), except on
2429 network file systems, where the buffer size was unpredictable and could be
2430 as large as several megabytes.
2432 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
2433 for the Linux quota interface which predates kernel version 2.4.22 has
2436 * The malloc_get_state and malloc_set_state functions have been removed.
2437 Already-existing binaries that dynamically link to these functions will
2438 get a hidden implementation in which malloc_get_state is a stub. As far
2439 as we know, these functions are used only by GNU Emacs and this change
2440 will not adversely affect already-built Emacs executables. Any undumped
2441 Emacs executables, which normally exist only during an Emacs build, should
2442 be rebuilt by re-running “./configure; make” in the Emacs build tree.
2444 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
2445 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
2446 “no-ip6-dotint” had already been the default, and support for the
2447 “ip6-dotint” option was removed from the Internet in 2006.
2449 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
2450 flag from <resolv.h> have been removed. The option relied on a
2451 backwards-incompatible DNS extension which was never deployed on the
2454 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
2455 RES_BLAST defined in the <resolv.h> header file have been deprecated.
2456 They were already unimplemented.
2458 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
2459 _res.flags are deprecated. The flag was standardized in RFC 2133, but
2460 removed again from the IETF name lookup interface specification in RFC
2461 2553. Applications should use getaddrinfo instead.
2463 * DNSSEC-related declarations and definitions have been removed from the
2464 <arpa/nameser.h> header file, and libresolv will no longer attempt to
2465 decode the data part of DNSSEC record types. Previous versions of glibc
2466 only implemented minimal support for the previous version of DNSSEC, which
2467 is incompatible with the currently deployed version.
2469 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
2470 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
2471 <arpa/nameser.h> header file because the distinction between RR types and
2472 meta-RR types is not officially standardized, subject to revision, and
2473 thus not suitable for encoding in a macro.
2475 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
2476 and rhook members of the res_state type in <resolv.h> have been removed.
2477 The glibc stub resolver did not support these hooks, but the header file
2478 did not reflect that.
2480 * For multi-arch support it is recommended to use a GCC which has
2481 been built with support for GNU indirect functions. This ensures
2482 that correct debugging information is generated for functions
2483 selected by IFUNC resolvers. This support can either be enabled by
2484 configuring GCC with '--enable-gnu-indirect-function', or by
2485 enabling it by default by setting 'default_gnu_indirect_function'
2486 variable for a particular architecture in the GCC source file
2489 * GDB pretty printers have been added for mutex and condition variable
2490 structures in POSIX Threads. When installed and loaded in gdb these pretty
2491 printers show various pthread variables in human-readable form when read
2492 using the 'print' or 'display' commands in gdb.
2494 * Tunables feature added to allow tweaking of the runtime for an application
2495 program. This feature can be enabled with the '--enable-tunables' configure
2496 flag. The GNU C Library manual has details on usage and README.tunables has
2497 instructions on adding new tunables to the library.
2499 * A new version of condition variables functions have been implemented in
2500 the NPTL implementation of POSIX Threads to provide stronger ordering
2503 * A new version of pthread_rwlock functions have been implemented to use a more
2504 scalable algorithm primarily through not using a critical section anymore to
2507 Security related changes:
2509 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
2510 have been created with makecontext could fail to terminate due to a
2511 missing .cantunwind annotation. This has been observed to lead to a hang
2512 (denial of service) in some Go applications compiled with gccgo. Reported
2513 by Andreas Schwab. (CVE-2016-6323)
2515 * The DNS stub resolver functions would crash due to a NULL pointer
2516 dereference when processing a query with a valid DNS question type which
2517 was used internally in the implementation. The stub resolver now uses a
2518 question type which is outside the range of valid question type values.
2521 The following bugs are resolved with this release:
2523 [4099] stdio: Overly agressive caching by stream i/o functions.
2524 [7065] build: Support building glibc with -fstack-protector or -fstack-
2526 [9842] localedata: en_CA: incorrect date format
2527 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2528 before it started waiting
2529 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2530 [15765] nptl: sem_open is wrongly a cancellation point
2531 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2532 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2534 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2535 library linked with pthread
2536 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2537 "FIXME: Ingo" issue)
2538 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2539 [17252] libc: getrandom and getentropy syscall
2540 [17730] malloc: thread-local storage is sometimes improperly free()'d
2541 after being __libc_memalign()'d
2542 [18241] stdio: failed fseek on memstream does not set errno and can fail
2544 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2546 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2547 PTHREAD_PRIO_INHERIT mutex on ARM
2548 [18784] network: res_query and related function crash for special record
2549 type queries (CVE-2015-5180)
2550 [19380] math: strtod does not raise "inexact"
2551 [19387] string: Integer overflow in memchr
2552 [19390] string: Integer overflow in strncat
2553 [19398] build: linknamespace tests fail with massively parallel build
2554 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2556 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2557 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2558 [19514] libc: [PATCH] Fix spelling errors in spelling
2559 "implement"/"implementation" in several places
2560 [19582] network: Deprecate RES_USE_INET6
2561 [19673] manual: clog10 docs appear to be erroneous
2562 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2563 causes a segmentation fault
2564 [19826] libc: invalid pointer returned from __tls_get_addr with static
2566 [20016] network: resolv: Remove hooks support from the API
2567 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2569 [20033] math: [x86_64] vectorized math function don't call the __finite
2571 [20116] nptl: use after free in pthread_create
2572 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2573 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2575 [20311] nptl: please install proc_service.h
2576 [20366] libc: Compilation errors in installed headers in strict-compliance
2578 [20370] malloc: malloc: Arena free list management is still racy
2579 (incorrect fix in bug 19243)
2580 [20386] libc: assert (X = 0) does not result in GCC warning
2581 [20432] malloc: malloc: Minimize interface required for interposition
2582 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2583 in _Unwind_Backtrace (CVE-2016-6323)
2584 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2585 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2587 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2588 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2589 [20477] network: resolv: incorrect double-checked locking related to
2591 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2593 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2595 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2596 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2597 cause transition penalty
2598 [20517] math: sparcv9 missing fdiml compat symbol
2599 [20524] manual: strverscmp is inconsistent
2600 [20525] libc: <sys/quota.h> should be based on kernel headers
2601 [20539] math: GCC 7 -static -lm fails to link at -O3
2602 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2604 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2606 [20591] network: Remove obsolete DNSSEC support
2607 [20592] network: DNS resource record type classification macros in
2608 <arpa/nameser.h> are incorrect
2609 [20593] network: Update DNS RR type definitions
2610 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2611 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2613 [20629] network: libresolv: Remove support for bitstring labels
2615 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2616 assertion: "maxidx >= 2"
2617 [20660] math: [arm] Use VSQRT
2618 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2619 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2620 [20689] libc: Test for FMA should also check for AVX.
2621 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2622 [20715] math: iszero macro breaks existing code
2623 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2624 [20728] libc: powerpc: Missing TOC stub in clone
2625 [20729] build: glibc-2.24 fails to build for i486 with -Os
2626 [20750] build: Build fails with default PIE enabled gcc-6.x
2627 [20768] math: [alpha] sqrt fegetenv namespace
2628 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2630 [20787] math: float_t is defined as float incorrectly on x86_64 even if
2631 __FLT_EVAL_METHOD__ is 2
2632 [20790] network: rpcgen buffer overrun in get_prog_declaration
2633 [20822] nptl: race condition in __lll_unlock_elision on powerpc
2634 [20829] libc: crypt snprintf namespace
2635 [20847] libc: tst-vfork3 failure
2636 [20855] math: Default bits/mathdef.h has inappropriate float_t
2637 [20859] math: [sh4] FP_ILOGB0 invalid
2638 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2639 U+20AC), not same as GBK
2640 [20915] dynamic-link: global-dynamic TLS broken on aarch64
2641 [20916] math: pow handling of sNaN arguments
2642 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2643 [20919] math: Bad pow (qNaN, 0) result with -lieee
2644 [20940] math: hypot sNaN handling
2645 [20947] math: fmax, fmin sNaN handling
2646 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2647 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2649 [20971] string: powerpc64/power7 memchr overflows internal pointer check
2650 [20973] nptl: robust mutexes: Lost wake-ups
2651 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2652 [20978] nis: strlen on null pointer in nss_nisplus
2653 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2655 [21014] string: i686 memchr overflows internal pointer check
2656 [21019] libc: [mips] n32 lseek incorrect on overflow
2657 [21022] libc: [microblaze] __backtrace get_frame_size namespace
2658 [21026] libc: [MIPS] readahead syscall is broken on n64
2659 [21028] math: Fallback fesetexceptflag should always succeed
2660 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2661 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2663 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2664 [21061] librt: [microblaze] librt lost clock_* exports
2665 [21073] libc: tunables: insecure environment variables passed to
2666 subprocesses with AT_SECURE
2667 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2671 * The minimum Linux kernel version that this version of the GNU C Library
2672 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2673 kernel version 2.6.32 or later suffices (on architectures that already
2674 required kernel versions more recent than 3.2, those requirements remain
2675 unchanged). Linux 3.2 or later kernel headers are required on all
2678 * The pap_AN locale has been deleted. This has been deprecated for a long
2679 time. It has been replaced by pap_AW & pap_CW, both of which have long
2680 been included in previous releases.
2682 * The readdir_r and readdir64_r functions have been deprecated. It is
2683 recommended to use readdir and readdir64 instead.
2685 * The type “union wait” has been removed. It was deprecated in the early
2686 1990s and never part of POSIX. Application code should use the int type
2687 instead of “union wait”.
2689 * A new NSS action is added to facilitate large distributed system
2690 administration. The action, MERGE, allows remote user stores like LDAP
2691 to be merged into local user stores like /etc/groups in order to provide
2692 easy to use, updated, and managed sets of merged credentials. The new
2693 action can be used by configuring it in /etc/nsswitch.conf:
2694 group: files [SUCCESS=merge] nis
2695 Implemented by Stephen Gallagher (Red Hat).
2697 * The deprecated __malloc_initialize_hook variable has been removed from the
2700 * The long unused localedef --old-style option has been removed. It hasn't
2701 done anything in over 16 years. Scripts using this option can safely
2704 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2705 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
2706 return the next representable value in the direction of positive infinity
2707 and the nextdown functions return the next representable value in the
2708 direction of negative infinity. These are currently enabled as GNU
2711 Security related changes:
2713 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
2714 could result in a stack overflow when getnetbyname was called with an
2715 overly long name. (CVE-2016-3075)
2717 * Previously, getaddrinfo copied large amounts of address data to the stack,
2718 even after the fix for CVE-2013-4458 has been applied, potentially
2719 resulting in a stack overflow. getaddrinfo now uses a heap allocation
2720 instead. Reported by Michael Petlan. (CVE-2016-3706)
2722 * The glob function suffered from a stack-based buffer overflow when it was
2723 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2724 Reported by Alexander Cherepanov. (CVE-2016-1234)
2726 * The Sun RPC UDP client could exhaust all available stack space when
2727 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
2728 alloca plugin for GCC. (CVE-2016-4429)
2730 * The IPv6 name server management code in libresolv could result in a memory
2731 leak for each thread which is created, performs a failing naming lookup,
2732 and exits. Over time, this could result in a denial of service due to
2733 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
2735 The following bugs are resolved with this release:
2737 [1170] localedata: ne_NP: update Nepali locale definition file
2738 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2740 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2741 [6796] math: fdim() does not set errno on overflow
2742 [10354] libc: posix_spawn should use vfork() in more cases than presently
2743 [11213] localedata: localedata: add copyright disclaimer to locale files
2744 [12143] localedata: chr_US: new Cherokee locale
2745 [12450] localedata: sgs_LT: new locale
2746 [12676] localedata: ln_CD: new locale
2747 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2749 [13304] math: fma, fmaf, fmal produce wrong results
2750 [14259] build: --localedir arg to configure is ignored
2751 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2752 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2753 [14934] localedata: es_CL: wrong first weekday chilean locale
2754 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2756 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2758 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2759 [15368] nptl: raise() is not async-signal-safe
2760 [15479] math: ceil, floor, round and trunc raise inexact exception
2761 [15578] localedata: kk_KZ: various updates
2762 [16003] localedata: pap_AN: punt old locale
2763 [16137] localedata: iw_IL: punt old locale
2764 [16190] localedata: eo: new esperanto locale
2765 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2766 [16742] malloc: race condition: pthread_atfork() called before first
2767 malloc() results in unexpected locking behaviour/deadlocks
2768 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2770 [16983] localedata: postal_fmt does not allow %l and %n modifiers
2771 [17565] localedata: pt_PT: wrong (work-)week start
2772 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2773 [17950] build: Build fails with -msse
2774 [18205] localedata: be_BY*: wrong first_weekday and first_workday
2775 [18433] libc: posix_spawn does not return correctly upon failure to
2777 [18453] localedata: charmaps/IBM875: incorrect codes
2778 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2780 [18896] localedata: he_IL: improvements for currency
2781 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2782 Romanian locale data
2783 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2785 [19056] libc: Deprecate readdir_r
2786 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2788 [19198] localedata: nl_NL: small improvements for Dutch locales
2789 [19257] network: Per-thread memory leak in __res_vinit with IPv6
2790 nameservers (CVE-2016-5417)
2791 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2793 [19400] locale: Language missing in "iso-639.def", trivial fix in
2795 [19431] malloc: Deadlock between fflush, getdelim, and fork
2796 [19505] libc: Incorrect file descriptor validity checks in
2797 posix_spawn_file_actions_add{open,close,dup2}
2798 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2799 when using RTLD_NEXT
2800 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2801 `intl/{gettextP,loadinfo}.h'
2802 [19534] libc: execle, execlp may use malloc
2803 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
2804 [19573] network: res_nclose and __res_maybe_init disagree about name
2805 server initialization, breaking Hesiod
2806 [19575] localedata: Status of GB18030 tables
2807 [19581] localedata: sr_* date_fmt string contains additional newline
2808 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
2810 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
2811 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
2812 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
2813 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
2815 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
2817 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
2819 [19610] dynamic-link: ldconfig -X removes stale symbolic links
2820 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
2821 [19633] locale: strfmon_l applies global locale to number formatting
2822 [19642] network: Memory leak in getnameinfo
2823 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
2824 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
2826 [19654] math: [x86_64] Need testcase for BZ #19590 fix
2827 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
2829 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
2830 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
2832 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
2834 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
2836 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
2837 pointers and lengths in error-case.
2838 [19727] locale: Converting from/to UTF-xx with iconv() does not always
2839 report errors on UTF-16 surrogates values.
2840 [19755] nscd: nscd assertion failure in gc
2841 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
2842 [19759] libc: mempcpy shouldn't be inlined
2843 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
2844 [19765] libc: s390 needs an optimized mempcpy
2845 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
2846 NAME_MAX limit assumption (CVE-2016-1234)
2847 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
2848 [19787] network: Missing and incorrect truncation checks in getnameinfo
2849 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
2851 [19791] network: Assertion failure in res_query.c with un-connectable name
2853 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
2854 [19822] math: libm.so install clobbers old version
2855 [19825] network: resolv: send_vc can return uninitialized data in second
2856 response to getaddrinfo
2857 [19830] network: nss_dns: should check RDATA length against buffer length
2858 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
2859 confronted with A/AAAA records of invalid size
2860 [19837] nss: nss_db: No retries for some long lines with a larger buffer
2861 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
2862 [19853] stdio: Printing IBM long double in decimal with high precision is
2864 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
2865 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
2866 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
2868 [19865] network: Assertion failure or memory leak in
2869 _nss_dns_getcanonname_r
2870 [19868] network: nss_dns: netent code does not skip over non-PTR records
2871 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
2873 [19881] string: Improve x86-64 memset
2874 [19907] string: Incorrect memcpy tests
2875 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
2877 [19925] libc: termios.h XCASE namespace
2878 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
2879 [19929] libc: limits.h NL_NMAX namespace
2880 [19931] stdio: Memory leak in vfprintf
2881 [19957] libc: clone(CLONE_VM) access invalid parent memory
2882 [19963] localedata: en_IL: New locale
2883 [19989] stdio: stdio.h cuserid namespace
2884 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
2886 [19996] locale: langinfo.h nl_langinfo_l namespace
2887 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
2888 [20010] network: getaddrinfo: Stack overflow in hostent translation
2890 [20012] stdio: libio: fmemopen append mode failure
2891 [20014] stdio: stdio.h namespace for pre-threads POSIX
2892 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
2893 [20023] libc: fcntl.h timespec namespace
2894 [20024] math: [x86_64] vectorized sincos trashes the stack
2895 [20031] network: nss_hesiod: Heap overflow in get_txt_records
2896 [20041] time: sys/time.h timespec namespace
2897 [20043] libc: unistd.h missing cuserid for UNIX98 and before
2898 [20044] libc: unistd.h missing pthread_atfork for UNIX98
2899 [20051] libc: ttyslot in wrong header under wrong conditions
2900 [20054] libc: gethostname not declared for XPG4
2901 [20055] libc: termios.h missing tcgetsid for XPG4
2902 [20072] dynamic-link: x86 init_cpu_features is called twice in static
2904 [20073] libc: sys/stat.h fchmod namespace
2905 [20074] libc: stdlib.h rand_r namespace
2906 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
2907 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
2909 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
2910 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
2912 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
2913 [20119] libc: Wrong mask for processors level type from CPUID
2914 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
2915 AS not supporting AVX512
2916 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
2918 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
2919 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
2921 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
2922 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
2923 [20178] libc: posix_spawn{p} should not call exit
2924 [20191] stdio: libio: vtables hardening
2925 [20195] string: FMA4 detection requires CPUID execution with register
2927 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
2928 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
2930 [20212] math: acos (sNaN) returns sNaN
2931 [20213] math: asin (sNaN) returns sNaN
2932 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
2933 [20218] math: [i386] asinhl (sNaN) returns sNaN
2934 [20219] math: [i386] atanhl (sNaN) returns sNaN
2935 [20222] stdio: fopencookie: Mangle function pointers
2936 [20224] math: [i386] cbrtl (sNaN) returns sNaN
2937 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
2938 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
2940 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
2941 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
2942 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
2943 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
2944 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
2945 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
2946 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
2947 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
2948 [20240] math: modf (sNaN) returns sNaN
2949 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
2950 [20250] math: frexp (sNaN) returns sNaN
2951 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
2952 [20255] math: [i386] fdim, fdimf return with excess range and precision /
2954 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
2955 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
2956 subscript is below array bounds [-Werror=array-bounds]
2957 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
2958 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
2960 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
2961 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
2963 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
2964 "invalid" exceptions
2965 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
2966 [20316] localedata: id_ID: Februari instead of Pebruari
2967 [20327] string: POWER8 strcasecmp returns incorrect result
2968 [20347] math: Failure: Test: j0_downward (0xap+0)
2969 [20348] libc: FAIL: misc/tst-preadvwritev64
2970 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
2971 [20350] libc: There is no test for p{read,write}64
2972 [20357] math: Incorrect cos result for 1.5174239687223976
2973 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
2977 * Unicode 8.0.0 Support: Character encoding, character type info, and
2978 transliteration tables are all updated to Unicode 8.0.0, using new
2979 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
2980 These updates cause user visible changes, such as the fixes for bugs
2981 89, 16061, and 18568.
2983 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
2984 kernel-internal CPU set size. This means that requests that change the
2985 CPU affinity which failed before (for example, an all-ones CPU mask) will
2986 now succeed. Applications that need to determine the effective CPU
2987 affinities need to call sched_getaffinity or pthread_getaffinity_np after
2988 setting it because the kernel can adjust it (and the previous size check
2989 would not detect this in the majority of cases).
2991 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
2992 the following new symbols are used: fts64_children, fts64_close,
2993 fts64_open, fts64_read and fts64_set.
2995 * getaddrinfo now detects certain invalid responses on an internal netlink
2996 socket. If such responses are received, an affected process will
2997 terminate with an error message of "Unexpected error <number> on netlink
2998 descriptor <number>" or "Unexpected netlink response of size <number> on
2999 descriptor <number>". The most likely cause for these errors is a
3000 multi-threaded application which erroneously closes and reuses the netlink
3001 file descriptor while it is used by getaddrinfo.
3003 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3004 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3005 unnecessary serialization of memory allocation requests across threads.
3006 The defect is now corrected. Users should see a substantial increase in
3007 the concurent throughput of allocation requests for applications which
3008 trigger this bug. Affected applications typically create and
3009 destroy threads frequently. (Bug 19048 was reported and analyzed by
3012 * There is now a --disable-timezone-tools configure option for disabling the
3013 building and installing of the timezone related utilities (zic, zdump, and
3014 tzselect). This is useful for people who build the timezone data and code
3015 independent of the GNU C Library.
3017 * The obsolete header <regexp.h> has been removed. Programs that require
3018 this header must be updated to use <regex.h> instead.
3020 * The obsolete functions bdflush, create_module, get_kernel_syms,
3021 query_module and uselib are no longer available to newly linked binaries;
3022 the header <sys/kdaemon.h> has been removed. These functions and header
3023 were specific to systems using the Linux kernel and could not usefully be
3024 used with the GNU C Library on systems with version 2.6 or later of the
3027 * Optimized string, wcsmbs and memory functions for IBM z13.
3028 Implemented by Stefan Liebler.
3030 * Newly linked programs that define a variable called signgam will no longer
3031 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3032 require signgam to be set by those functions must ensure that they use the
3033 variable provided by the GNU C Library and declared in <math.h>, without
3034 defining their own copy.
3036 * The minimum GCC version that can be used to build this version of the GNU
3037 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3038 still be used to compile programs using the GNU C Library.
3040 Security related changes:
3042 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3043 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3045 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3046 the pointer guard feature. It is always enabled. Previously,
3047 LD_POINTER_GUARD could be used to disable security hardening in binaries
3048 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3051 * An integer overflow in hcreate and hcreate_r could lead to an
3052 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3054 * The catopen function no longer has unbounded stack usage. Reported by
3055 Max. (CVE-2015-8779)
3057 * The nan, nanf and nanl functions no longer have unbounded stack usage
3058 depending on the length of the string passed as an argument to the
3059 functions. Reported by Joseph Myers. (CVE-2014-9761)
3061 * A stack-based buffer overflow was found in libresolv when invoked from
3062 libnss_dns, allowing specially crafted DNS responses to seize control
3063 of execution flow in the DNS client. The buffer overflow occurs in
3064 the functions send_dg (send datagram) and send_vc (send TCP) for the
3065 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3066 family. The use of AF_UNSPEC triggers the low-level resolver code to
3067 send out two parallel queries for A and AAAA. A mismanagement of the
3068 buffers used for those queries could result in the response of a query
3069 writing beyond the alloca allocated buffer created by
3070 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3071 the overflow. Thanks to the Google Security Team and Red Hat for
3072 reporting the security impact of this issue, and Robert Holiday of
3073 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3075 The following bugs are resolved with this release:
3077 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3078 [887] math: Math library function "logb" and "nextafter" inconsistent
3079 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3080 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3081 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3082 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3084 [4404] localedata: German translation of "Alarm clock" is misleading
3085 [6799] math: nextafter() and nexttoward() doen't set errno on
3086 overflow/underflow errors
3087 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3089 [10432] nis: _nss_nis_setnetgrent assertion failure
3090 [11460] libc: fts has no LFS support
3091 [12926] network: getaddrinfo()/make_request() may spin forever
3092 [13065] nptl: Race condition in pthread barriers
3093 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3094 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3096 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3097 [14912] libc: Rename non-installed bits/*.h headers
3098 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3099 [15367] math: Let gcc use __builtin_isinf
3100 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3101 [15421] math: lgamma wrongly sets signgam for ISO C
3102 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3103 FE_INVALID with argument out of range
3104 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3106 [15786] dynamic-link: ifunc resolver functions can smash function
3108 [15918] math: Unnecessary check for equality in hypotf()
3109 [16061] localedata: Review / update transliteration data
3110 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3112 [16141] time: strptime %z offset restriction
3113 [16171] math: drem should be alias of remainder
3114 [16296] math: fegetround is pure?
3115 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3116 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3118 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3119 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3121 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3122 "Exception "Inexact" set" on ppc32
3123 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3124 [16517] math: Missing underflow exception from tanf/tan/tanl
3125 [16519] math: Missing underflow exception from sinhf
3126 [16520] math: Missing underflow exception from tanhf
3127 [16521] math: Missing underflow exception from exp2
3128 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3130 [16734] stdio: fopen calls mmap to allocate its buffer
3131 [16961] math: nan function incorrect handling of bad sequences
3132 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3133 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3134 [16985] locale: localedef: confusing error message when opening output
3136 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3137 [17197] locale: Redundant shift character in iconv conversion output at
3139 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3140 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3141 [17250] dynamic-link: static linking breaks nss loading
3142 (getaddrinfo/getpwnam/etc...)
3143 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3145 [17441] math: isnan() should use __builtin_isnan() in GCC
3146 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3147 (related to lock elision)
3148 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3149 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3150 [17887] time: strptime should be able to parse "+01:00" style timezones
3151 [17905] libc: catopen() Multiple unbounded stack allocations
3153 [18084] libc: backtrace (..., 0) dumps core on x86
3154 [18086] libc: nice() sets errno to 0 on success
3155 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3156 is too large (CVE-2015-8778)
3157 [18251] dynamic-link: SONAME missing when audit modules provides path
3158 [18265] libc: add attributes for wchar string and memory functions
3159 [18370] math: csqrt missing underflows
3160 [18421] libc: [hppa] read-only segment has dynamic relocations
3161 [18472] libc: Obsolete syscall wrappers should be compat symbols
3162 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3163 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3164 [18525] localedata: Remove locale timezone information
3165 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3166 [18568] localedata: Update locale data to Unicode 8.0
3167 [18589] locale: sort-test.sh fails at random
3168 [18595] math: ctan, ctanh missing underflows
3169 [18604] libc: assert macro-expands its argument
3170 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3171 contains a vector instruction exception.
3172 [18611] math: j1, jn missing errno setting on underflow
3173 [18618] localedata: sync Chechen locale definitions with other *_RU
3175 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3176 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3177 [18665] network: In send_dg, the recvfrom function is NOT always using the
3178 buffer size of a newly created buffer (CVE-2015-7547)
3179 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3181 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3183 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3184 [18699] math: tilegx cproj() for various complex infinities does not yield
3186 [18724] libc: Harden put*ent functions against data injection
3187 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3188 [18755] build: build errors with -DNDEBUG
3189 [18757] stdio: fmemopen fails to set errno on failure
3190 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3192 [18781] libc: openat64 lacks O_LARGEFILE
3193 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3194 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3195 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3196 [18790] math: [ldbl-128ibm] tanhl inaccurate
3197 [18795] libc: stpncpy fortification misses buffer lengths that are
3198 statically too large
3199 [18796] build: build fails for --disable-mathvec
3200 [18803] math: hypot missing underflows
3201 [18820] stdio: fmemopen may leak memory on failure
3202 [18823] math: csqrt spurious underflows
3203 [18824] math: fma spurious underflows
3204 [18825] math: pow missing underflows
3205 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3206 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3207 [18870] build: sem_open.c fails to compile with missing symbol
3209 [18872] stdio: Fix memory leak in printf_positional
3210 [18873] libc: posix_fallocate overflow check ineffective
3211 [18875] math: Excess precision leads incorrect libm
3212 [18877] libc: arm: mmap offset regression
3213 [18887] libc: memory corruption when using getmntent on blank lines
3214 [18918] localedata: hu_HU: change time to HH:MM:SS format
3215 [18921] libc: Regression: extraneous stat() and fstat() performed by
3217 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3218 binaries (CVE-2015-8777)
3219 [18951] math: tgamma missing underflows
3220 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3222 [18953] localedata: lt_LT: change currency symbol to the euro
3223 [18956] math: powf inaccuracy
3224 [18961] math: [i386] exp missing underflows
3225 [18966] math: [i386] exp10 missing underflows
3226 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3227 [18969] build: multiple string test failures due to missing locale
3229 [18970] libc: Reference of pthread_setcancelstate in libc.a
3230 [18977] math: float / long double Bessel functions not in XSI POSIX
3231 [18980] math: i386 libm functions return with excess range and precision
3232 [18981] math: i386 scalb*, ldexp return with excess range and precision
3233 [18982] stdio: va_list and vprintf
3234 [18985] time: Passing out of range data to strftime() causes a segfault
3236 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3237 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3238 [19012] locale: iconv_open leaks memory on error path
3239 [19016] math: clog, clog10 inaccuracy
3240 [19018] nptl: Mangle function pointers in tls_dtor_list
3241 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3242 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3243 [19048] malloc: malloc: arena free list can become cyclic, increasing
3245 [19049] math: [powerpc] erfc incorrect zero sign
3246 [19050] math: [powerpc] log* incorrect zero sign
3247 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3248 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3249 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3250 [19074] network: Data race in _res_hconf_reorder_addrs
3251 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
3252 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
3253 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
3255 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
3257 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
3258 [19086] manual: posix_fallocate64 documented argument order is wrong.
3259 [19088] math: lround, llround missing exceptions close to overflow
3261 [19094] math: lrint, llrint missing exceptions close to overflow threshold
3262 [19095] math: dbl-64 lrint incorrect for 64-bit long
3263 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
3264 [19124] dynamic-link: ld.so failed to build with older assmebler
3265 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
3266 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
3267 [19134] math: [powerpc32] lround, lroundf spurious exceptions
3268 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
3269 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
3270 pthread_setaffinity_np
3271 [19156] math: [ldbl-128] j0l spurious underflows
3272 [19164] nptl: tst-getcpu fails with many possible CPUs
3273 [19168] math: math/test-ildoubl and math/test-ldouble failure
3274 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
3275 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
3277 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
3278 (FE_NOMASK_ENV) do not clear SSE exceptions
3279 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
3280 _int_new_arena/reused_arena
3281 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
3282 [19201] math: dbl-64 remainder incorrect sign of zero result
3283 [19205] math: bits/math-finite.h conditions do not match math.h and
3285 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
3286 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
3287 for C99-based standards
3288 [19212] libc: features.h not -Wundef clean
3289 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
3291 [19214] libc: Family and model identification for AMD CPU's are incorrect.
3292 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
3293 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
3295 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
3296 "inexact" exceptions
3297 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
3299 [19242] libc: strtol incorrect in Turkish locales
3300 [19243] malloc: reused_arena can pick an arena on the free list, leading
3301 to an assertion failure and reference count corruption
3302 [19253] time: tzset() ineffective when temporary TZ did not include DST
3304 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
3305 [19270] math: [hppa] Shared libm missing __isnanl
3306 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
3307 MAP_HUGETLB and MAP_STACK defines
3308 [19313] nptl: Wrong __cpu_mask for x32
3309 [19347] libc: grantpt: try to force a specific gid even without pt_chown
3310 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
3311 [19350] math: [ldbl-128ibm] sinhl spurious overflows
3312 [19351] math: [ldbl-128ibm] logl inaccurate near 1
3313 [19363] time: x32: times() return value wrongly truncates/sign extends
3315 [19367] dynamic-link: Improve branch prediction on Silvermont
3316 [19369] network: Default domain name not reset by res_ninit when "search"
3317 / "domain" entry is removed from resolv.conf
3318 [19375] math: powerpc: incorrect results for POWER7 logb with negative
3320 [19385] localedata: bg_BG: time separator should be colon, not comma
3321 [19408] libc: linux personality syscall wrapper may erroneously return an
3322 error on 32-bit architectures
3323 [19415] libc: dladdr returns wrong names on hppa
3324 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
3325 IBM905, IBM907, and IBM909
3326 [19439] math: Unix98 isinf and isnan functions conflict with C++11
3327 [19443] build: build failures with -DDEBUG
3328 [19451] build: Make check fails on test-double-vlen2
3329 [19462] libc: Glibc failed to build with -Os
3330 [19465] math: Wrong code with -Os
3331 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
3333 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
3335 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
3336 [19486] math: S390: Math tests fail with "Exception Inexact set".
3337 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
3338 [19550] libc: [mips] mmap negative offset handling inconsistent with other
3340 [19590] math: Fail to build shared objects that use libmvec.so functions.
3344 * The following bugs are resolved with this release:
3346 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
3347 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
3348 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
3349 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
3350 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
3351 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
3352 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
3353 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
3354 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
3355 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
3356 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
3357 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
3358 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
3359 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
3360 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
3361 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
3362 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
3363 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
3364 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
3365 18657, 18676, 18694, 18696, 18887.
3367 * Cache information can be queried via sysconf() function on s390 e.g. with
3368 _SC_LEVEL1_ICACHE_SIZE as argument.
3370 * A buffer overflow in gethostbyname_r and related functions performing DNS
3371 requests has been fixed. If the NSS functions were called with a
3372 misaligned buffer, the buffer length change due to pointer alignment was
3373 not taken into account. This could result in application crashes or,
3374 potentially arbitrary code execution, using crafted, but syntactically
3375 valid DNS responses. (CVE-2015-1781)
3377 * The time zone file parser has been made more robust against crafted time
3378 zone files, avoiding heap buffer overflows related to the processing of
3379 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
3380 large time zone data files. Overly long time zone specifiers in the TZ
3381 variable no longer result in stack overflows and crashes.
3383 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
3384 for LD and GD on x86 and x86-64, has been implemented. You will need
3385 binutils-2.24 or later to enable this optimization.
3387 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
3388 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
3389 Hat). These updates cause user visible changes, such as the fix for bug
3392 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
3393 and getXXbyYY NSS calls for the same database, causing a denial-of-service
3394 condition in some applications.
3396 * Added vector math library named libmvec with the following vectorized x86_64
3397 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
3399 The library can be disabled with --disable-mathvec. Use of the functions is
3400 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
3401 Shared library libmvec.so is linked in as needed when using -lm (no need to
3402 specify -lmvec explicitly for not static builds).
3403 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
3405 * A new fmemopen implementation has been added with the goal of POSIX
3406 compliance. The new implementation fixes the following long-standing
3407 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
3408 old implementation is still present for use be by existing binaries.
3410 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
3411 releases. It has been fixed to match 2.19 and older, but binaries built
3412 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
3414 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
3415 Contributed by Roland McGrath (Google).
3417 * The header <regexp.h> is deprecated, and will be removed in a future
3418 release. Use of this header will trigger a deprecation warning.
3419 Application developers should update their code to use <regex.h> instead.
3421 This header was formerly part of SUS, but was deprecated in 1994 and
3422 removed from the standard in 2001. Also, the glibc implementation
3423 leaks memory. See BZ#18681 for more details.
3427 * The following bugs are resolved with this release:
3429 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
3430 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
3431 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
3432 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
3433 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
3434 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
3435 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
3436 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
3437 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
3438 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
3441 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
3442 too little memory for the to-be-scanned arguments and overflow the
3443 allocated buffer. The implementation now correctly computes the required
3444 buffer size when using malloc, and switches to malloc from alloca as
3447 * A new semaphore algorithm has been implemented in generic C code for all
3448 machines. Previous custom assembly implementations of semaphore were
3449 difficult to reason about or ensure that they were safe. The new version
3450 of semaphore supports machines with 64-bit or 32-bit atomic operations.
3451 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
3452 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
3454 * Port to Altera Nios II has been contributed by Mentor Graphics.
3456 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
3457 implementations for powerpc64/powerpc64le.
3458 Implemented by Adhemerval Zanella (IBM).
3460 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
3461 and powerpc64le. This may improve lock scaling of existing programs on
3462 HTM capable systems. The lock elision code is only enabled with
3463 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
3464 powerpc will issue a transaction abort on every syscall to avoid side
3465 effects being visible outside transactions.
3467 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
3468 AArch64. Contributed by ARM Ltd.
3470 * i386 memcpy functions optimized with SSE2 unaligned load/store.
3472 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
3473 under certain input conditions resulting in the execution of a shell for
3474 command substitution when the application did not request it. The
3475 implementation now checks WRDE_NOCMD immediately before executing the
3476 shell and returns the error WRDE_CMDSUB as expected.
3478 * CVE-2012-3406 printf-style functions could run into a stack overflow when
3479 processing format strings with a large number of format specifiers.
3481 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
3482 infinite loop if the DNS response contained a PTR record of an unexpected
3485 * The minimum GCC version that can be used to build this version of the GNU
3486 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
3487 still be used to compile programs using the GNU C Library.
3489 * The GNU C Library is now built with -Werror by default. This can be
3490 disabled by configuring with --disable-werror.
3492 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
3494 * The obsolete sigvec function has been removed. This was the original
3495 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
3496 programs have been using instead for about 25 years. Of course, ABI
3497 compatibility for old binaries using sigvec remains intact.
3499 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
3500 with newer versions of bison.
3502 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
3503 The original MIPS o32 hard-float ABI requires an FPU where double-precision
3504 registers overlay two consecutive single-precision registers. MIPS32R2
3505 introduced a new FPU mode (FR=1) where double-precision registers extend the
3506 corresponding single-precision registers which is incompatible with the
3507 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
3508 require the use of FR=1 making a transition necessary. New o32 ABI
3509 extensions enable users to migrate over time from the original o32 ABI
3510 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
3511 tracks the ABI of any loaded object and verifies that new objects are
3512 compatible. Mode transitions will also be requested as required and
3513 unsupportable objects will be rejected. The ABI checks include both soft and
3514 hard float ABIs for o32, n32 and n64.
3516 GCC 5 with GNU binutils 2.25 onwards:
3517 It is strongly recommended that all o32 system libraries are built using the
3518 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
3519 with the original and all new o32 ABI extensions. Configure a MIPS GCC
3520 compiler using --with-fp-32=xx to set this by default.
3524 * The following bugs are resolved with this release:
3526 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3527 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3528 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3529 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3530 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3531 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3532 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3533 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3534 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3535 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3536 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3537 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3538 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3539 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3540 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3542 * Reverted change of ABI data structures for s390 and s390x:
3543 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3544 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3545 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3546 are preserved pointing straight to the same implementation as the old ones.
3547 Given that, new callers will simply provide a too-big buffer to these
3548 functions. Any applications/libraries out there that embed jmp_buf or
3549 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3550 against 2.19 headers will have to rebuilt again. This is necessary in any
3551 case to revert the breakage in their ABI caused by the glibc change.
3553 * Support for file description locks is added to systems running the
3554 Linux kernel. The standard file locking interfaces are extended to
3555 operate on file descriptions, not file descriptors, via the use of
3556 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3557 are associated with an open file instead of a process.
3559 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3561 * The minimum Linux kernel version that this version of the GNU C Library
3562 can be used with is 2.6.32.
3564 * Running the testsuite no longer terminates as soon as a test fails.
3565 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3566 with PASS or FAIL lines for individual tests. A summary of the results is
3567 printed, including a list of failing lists, and "make check" exits with
3568 error status if there were any unexpected failures. "make check
3569 stop-on-test-failure=y" may be used to keep the old behavior.
3571 * The am33 port, which had not worked for several years, has been removed
3574 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3575 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3576 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3577 conflicted with POSIX (support for which was removed in 2.19), the
3578 interfaces those macros enabled remain available when compiling with
3579 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3580 test macros defined.
3582 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3584 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3585 This may improve lock scaling of existing programs on TX capable systems.
3586 The lock elision code is only built with --enable-lock-elision=yes and
3587 then requires a GCC version supporting the TX builtins. With lock elision
3588 default mutexes are elided via __builtin_tbegin, if the cpu supports
3589 transactions. By default lock elision is not enabled and the elision code
3592 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3593 copy the path argument. This allowed programs to cause posix_spawn to
3594 deference a dangling pointer, or use an unexpected pathname argument if
3595 the string was modified after the posix_spawn_file_actions_addopen
3598 * All supported architectures now use the main glibc sysdeps directory
3599 instead of some being in a separate "ports" directory (which was
3600 distributed separately before glibc 2.17).
3602 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3603 On configurations that support it (all Linux configurations), it's now
3604 used regardless of the --enable-add-ons switch to configure. It is no
3605 longer possible to build such configurations without pthreads support.
3607 * Locale names, including those obtained from environment variables (LANG
3608 and the LC_* variables), are more tightly checked for proper syntax.
3609 setlocale will now fail (with EINVAL) for locale names that are overly
3610 long, contain slashes without starting with a slash, or contain ".." path
3611 components. (CVE-2014-0475) Previously, some valid locale names were
3612 silently replaced with the "C" locale when running in AT_SECURE mode
3613 (e.g., in a SUID program). This is no longer necessary because of the
3616 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3617 with application code using Intel MPX instructions. (With all previous
3618 versions, the MPX register state could be clobbered when making calls
3619 into or out of a shared library.) Note that while the new dynamic
3620 linker is compatible with all known x86 hardware whether or not it
3621 supports Intel MPX, some x86 instruction-set emulators might fail to
3622 handle the new instruction encodings. This is known to affect Valgrind
3623 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3624 release), and might affect other tools that do instruction emulation.
3626 * Support for loadable gconv transliteration modules has been removed.
3627 The support for transliteration modules has been non-functional for
3628 over a decade, and the removal is prompted by security defects. The
3629 normal gconv conversion modules are still supported. Transliteration
3630 with //TRANSLIT is still possible, and the //IGNORE specifier
3631 continues to be supported. (CVE-2014-5119)
3633 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3634 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3635 resulting a denial-of-service security vulnerability in applications which
3636 use functions related to iconv. (CVE-2014-6040)
3640 * The following bugs are resolved with this release:
3642 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3643 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3644 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3645 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3646 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3647 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3648 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3649 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3650 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3651 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3652 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3653 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3654 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3655 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3656 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3657 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3658 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3659 16431, 16453, 16474, 16506, 16510, 16529
3661 * Slovenian translations for glibc messages have been contributed by the
3662 Translation Project's Slovenian team of translators.
3664 * The public headers no longer use __unused nor __block. This change is to
3665 support compiling programs that are derived from BSD sources and use
3666 __unused internally, and to support compiling with Clang's -fblock
3667 extension which uses __block.
3669 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3670 large collation sequences to optimize multiple passes. This cache
3671 computation may overflow for large collation sequences and may cause a
3672 stack or buffer overflow. This is now fixed to use a slower algorithm
3673 which does not use a cache if there is an integer overflow.
3675 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3676 rules for large collation sequences to optimize multiple passes and falls
3677 back to alloca if malloc fails, resulting in a possible stack overflow.
3678 The implementation now falls back to an uncached collation sequence lookup
3681 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3682 initialized for static applications resulting in the security feature
3683 being disabled. The pointer guard is now correctly initialized to a
3684 random value for static applications. Existing static applications need
3685 to be recompiled to take advantage of the fix (bug 15754).
3687 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3688 to the d_name member of struct dirent, or omit the terminating NUL
3689 character. (Bugzilla #14699).
3691 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3692 aligned_alloc functions could allocate too few bytes or corrupt the
3693 heap when passed very large allocation size values (Bugzilla #15855,
3696 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3697 for AF_INET6 has been fixed (Bugzilla #16072).
3699 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3700 pap_CW, quz_PE, the_NP.
3702 * Substantially revised locales: gd_GB, ht_HT
3704 * The LC_ADDRESS field was updated to support country_car for almost all
3707 * ISO 1427 definitions were updated.
3709 * ISO 3166 definitions were updated.
3711 * The localedef utility now supports --big-endian and --little-endian
3712 command-line options to generate locales for a different system from that
3713 for which the C library was built.
3715 * Binary locale files now only depend on the endianness of the system for
3716 which they are generated and not on other properties of that system. As a
3717 consequence, binary files generated with new localedef may be incompatible
3718 with old versions of the GNU C Library, and binary files generated with
3719 old localedef may be incompatible with this version of the GNU C Library,
3720 in the following circumstances:
3722 + Locale files may be incompatible on m68k systems.
3724 + Locale archive files (but not separate files for individual locales) may
3725 be incompatible on systems where plain "char" is signed.
3727 * The configure option --disable-versioning has been removed. Builds with
3728 --disable-versioning had not worked for several years.
3730 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3731 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3733 * SystemTap probes for malloc have been introduced.
3735 * SystemTap probes for slow multiple precision fallback paths of
3736 transcendental functions have been introduced.
3738 * Support for powerpc64le has been added.
3740 * The soft-float powerpc port now supports e500 processors.
3742 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3744 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3745 set of header declarations that are enabled by default, even when other
3746 feature test macros or compiler options such as -std=c99 would otherwise
3747 disable some of those declarations.
3749 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3750 conflict with POSIX. The libbsd-compat library (which was a dummy library
3751 that did nothing) has also been removed.
3753 * Preliminary documentation about Multi-Thread, Async-Signal and
3754 Async-Cancel Safety has been added.
3756 * Change of ABI data structures for s390 and s390x:
3757 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3758 allow for future hardware extensions. All library functions that accept or
3759 return these structures were versioned in order to provide backwards
3760 compatibility with existing code. However, not all cases can be handled
3761 with interface versioning. If an application embeds either structure into
3762 another structure and that structure is passed to another compilation unit
3763 which expects the newer larger-sized object then any access to the new
3764 fields will result in undefined behaviour. Similarly any access to fields
3765 that were moved by the enlarging of the structures will cause undefined
3766 behaviour. To fix the undefined behaviour all objects that are part of the
3767 final in-memory image must agree on the size of structures, and this may
3768 require recompilation.
3772 * The following bugs are resolved with this release:
3774 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3775 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3776 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3777 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3778 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3779 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3780 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3781 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3782 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3783 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3784 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3785 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3786 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3789 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3790 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3791 Distributions can re-enable building and using pt_chown via the new configure
3792 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
3793 considerable security risks and should only be used if the distribution
3794 understands and accepts the risks.
3796 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3799 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3800 fixed (Bugzilla #15330).
3802 * Add support for calling C++11 thread_local object destructors on thread
3803 and program exit. This needs compiler support for offloading C++11
3804 destructor calls to glibc.
3806 * Improved worst case performance of libm functions with double inputs and
3809 * Support for priority inherited mutexes in pthread condition variables on
3810 non-x86 architectures.
3812 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
3814 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
3816 * Optimized string functions for ARM. Implemented by Will Newton and
3819 * Optimized libm functions for SPARC. Implemented by David S. Miller.
3821 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
3824 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
3825 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
3827 * Added a benchmark framework to track performance of functions in glibc.
3829 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
3830 It is based on draft TS 18661 and currently enabled as a GNU extension.
3832 * On Linux, the clock function now uses the clock_gettime system call
3833 for improved precision, rather than old times system call.
3835 * Added support for version-3 tz format files. This is needed when using
3836 the tz database release 2013e or later, and affects a few unusual cases --
3837 currently only TZ='America/Godthab' for time stamps after 2037.
3839 * Added new API functions pthread_getattr_default_np and
3840 pthread_setattr_default_np to get and set the default pthread
3841 attributes of a process.
3843 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
3844 This may improve lock scaling of existing programs on TSX capable systems.
3845 When the --enable-lock-elision=yes parameter is specified at configure
3846 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
3849 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
3850 availability). Implemented by Ryan S. Arnold.
3852 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
3856 * The following bugs are resolved with this release:
3858 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
3859 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
3860 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
3861 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
3862 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
3863 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
3864 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
3865 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
3866 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
3867 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
3868 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
3869 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
3870 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
3871 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
3872 14879, 14889, 14893, 14898, 14914.
3874 * Optimization of memcpy for MIPS.
3876 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
3877 EMFILE has been fixed (Bugzilla #14889).
3879 * The add-on ports collection is now distributed in the "ports" subdirectory
3880 of the main GNU C Library distribution, rather than separately.
3882 * Port to ARM AArch64 contributed by Linaro.
3884 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
3885 Optimized versions of memcpy, memset, and memcmp added for System z10 and
3887 Implemented by Andreas Krebbel.
3889 * The new function secure_getenv allows secure access to the environment,
3890 returning NULL if running in a SUID/SGID process. This function replaces
3891 the internal function __secure_getenv.
3893 * SystemTap static probes have been added into the dynamic linker.
3894 Implemented by Gary Benson.
3896 * Optimizations of string functions strstr, strcasestr and memmem.
3897 Implemented by Maxim Kuvyrkov.
3899 * The minimum Linux kernel version that this version of the GNU C Library
3900 can be used with is 2.6.16.
3902 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
3903 powerpc POWER7. Implemented by Will Schmidt.
3905 * New configure option --disable-nscd builds the C library such that it
3906 never attempts to contact the Name Service Caching Daemon (nscd).
3907 New configure option --disable-build-nscd avoids building nscd itself;
3908 this is the default if --disable-nscd is used.
3910 * Improved support for cross-compilation, including cross-testing and
3911 bootstrap builds without a previously built glibc.
3913 * Several testsuite tests are now able to test multiple IFUNC variants of an
3914 interface, rather than just testing the one that would be chooen by
3917 * New configure options --with-bugurl and --with-pkgversion, for
3918 distributors to use to embed their bug-reporting and package version
3919 information in --help and --version output.
3921 * The ttyname and ttyname_r functions on Linux now fall back to searching for
3922 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
3923 allows creation of chroots without the procfs mounted on /proc.
3925 * The `crypt' function now fails if passed salt bytes that violate the
3926 specification for those values. On Linux, the `crypt' function will
3927 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
3928 enabled, and fail on encrypted strings using the MD5 or DES algorithm
3929 when the mode is enabled.
3931 * The `clock_*' suite of functions (declared in <time.h>) is now available
3932 directly in the main C library. Previously it was necessary to link with
3933 -lrt to use these functions. This change has the effect that a
3934 single-threaded program that uses a function such as `clock_gettime' (and
3935 is not linked with -lrt) will no longer implicitly load the pthreads
3936 library at runtime and so will not suffer the overheads associated with
3937 multi-thread support in other code such as the C++ runtime library.
3939 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
3944 * The following bugs are resolved with this release:
3946 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
3947 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
3948 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
3949 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
3950 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
3951 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
3952 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
3953 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
3954 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
3955 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
3956 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
3957 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
3958 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
3959 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
3960 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
3961 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
3962 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
3963 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
3964 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
3965 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
3966 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
3967 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
3970 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
3971 configuring glibc with:
3972 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
3973 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
3974 Implemented by H.J. Lu.
3978 + define static_assert
3980 + do not declare gets
3982 + declare at_quick_exit and quick_exit also for ISO C11
3984 + aligned_alloc. NB: The code is deliberately allows the size parameter
3985 to not be a multiple of the alignment. This is a moronic requirement
3986 in the standard but it is only a requirement on the caller, not the
3989 + timespec_get added
3991 + uchar.h support added
3993 + CMPLX, CMPLXF, CMPLXL added
3995 Implemented by Ulrich Drepper.
3997 * Support for the IA-64 has been moved to ports.
3999 * Remove support for anything but ELF binary format
4001 * Checking versions of poll, ppoll added.
4002 Implemented by Ulrich Drepper.
4004 * More generic and 64-bit performance optimizations to math functions.
4005 Implemented by Ulrich Drepper.
4007 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4008 headers and functions available at compile time as they were before
4009 version 2.14. This option will be removed at some time in the future
4010 after the TI-RPC library becomes fully sufficient for the needs of
4011 existing applications.
4013 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4014 Note that glibc is not expected to work with any Linux kernel version
4017 * New header <sys/auxv.h> and function getauxval allowing easy access to
4018 the AT_* key-value pairs passed from the Linux kernel. The header also
4019 defines the HWCAP_* bits associated with the AT_HWCAP key.
4021 * New locales: mag_IN
4023 * New configure option --enable-systemtap builds SystemTap static probes
4024 into libc for setjmp and longjmp and into libpthread for various operations.
4025 So far the setjmp/longjmp probes and some of the libpthread probes are
4026 provided only for i*86 and x86_64.
4027 Implemented by Roland McGrath and Rayson Ho.
4029 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4031 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4034 * More optimized functions for SPARC. Implemented by David S. Miller.
4036 * Improved support for cross-compilation, especially bootstrap builds
4037 without a previously built glibc.
4039 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4040 Chris Metcalf from Tilera.
4042 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4043 now supported for ARM processors.
4045 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4046 as the name of the dynamic linker, to distinguish it from the
4047 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4049 * Support for CRIS has been removed from ports.
4051 * A new class of installed header has been documented for low-level
4052 platform-specific functionality. PowerPC added the first instance with a
4053 function to provide time base register access. Contributed by Tulio
4054 Magno Quites Machado Filho.
4056 * ix86 configurations now install header files that are consistent with
4057 what x86-64 configurations install. These same header files can be used
4058 for -m32, -m64, or -mx32 builds.
4059 Contributed by H.J. Lu.
4061 * Math library bug fixes. A thorough audit of all open math library bugs was
4062 conducted by Joseph Myers. Significant progress was made on many math
4063 library bugs resulting in more accurate exceptions and function results.
4064 Many thanks to all those that contributed including Andreas Jaeger for his
4065 patch review and work on the x87 trigonometric instruction issues.
4067 * Timezone data is no longer installed. Timezone-related binaries and scripts
4068 will continue to be installed. Users should obtain their timezone data from
4069 their distribution provider or from the tzdata package at
4070 <ftp://munnari.oz.au/pub/>.
4074 * The following bugs are resolved with this release:
4076 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4077 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4078 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4079 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4080 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4081 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4082 13484, 13506, 13515, 13523, 13524, 13538, 13540
4084 * New program pldd to list loaded object of a process
4085 Implemented by Ulrich Drepper.
4087 * Add nss_db support back to glibc. No more dependency on Berkeley db
4088 and support for initgroups lookups.
4089 Implemented by Ulrich Drepper.
4091 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4092 Contributed by HJ Lu.
4094 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4095 Contributed by HJ Lu.
4097 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4098 on x86-32 and x86-64.
4099 Contributed by Liubov Dmitrieva.
4101 * Optimized strchr and strrchr for SSE on x86-32.
4102 Contributed by Liubov Dmitrieva.
4104 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4105 for x86-64 and x86-32.
4106 Contributed by Liubov Dmitrieva.
4108 * New interfaces: scandirat, scandirat64
4109 Implemented by Ulrich Drepper.
4111 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4112 Implemented by Ulrich Drepper.
4114 * nscd now also caches the netgroup database.
4115 Implemented by Ulrich Drepper.
4117 * Integrate libm with gcc's -ffinite-math-only option.
4118 Implemented by Ulrich Drepper.
4120 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4121 to math functions. Implemented by Ulrich Drepper.
4123 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4124 Implemented by Ulrich Drepper.
4126 * New Linux interfaces: process_vm_readv, process_vm_writev
4128 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4129 Implemented by Ulrich Drepper.
4131 * Optimized nearbyint and strcasecmp for PPC.
4132 Implemented by Adhemerval Zanella.
4134 * New locales: bho_IN, unm_US, es_CU, ta_LK
4138 * The following bugs are resolved with this release:
4140 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4141 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4142 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4143 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4144 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4145 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4146 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4147 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4148 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4149 12795, 12811, 12813, 12814, 12841
4151 * The RPC implementation in libc is obsoleted. Old programs keep working
4152 but new programs cannot be linked with the routines in libc anymore.
4153 Programs in need of RPC functionality must be linked against TI-RPC.
4154 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4156 Visible changes of this change include (obviously) the inability to link
4157 programs using RPC functions without referencing the TI-RPC library and the
4158 removal of the RPC headers from the glibc headers.
4159 Implemented by Ulrich Drepper.
4161 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4162 syncfs, setns, sendmmsg
4164 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4165 yue_HK, lij_IT, mhr_RU
4167 * New encodings: CP770, CP771, CP772, CP773, CP774
4169 * New program sotruss to trace calls through PLTs
4170 Implemented by Ulrich Drepper.
4172 * The malloc hook implementation is marked deprecated and will be removed
4173 from the default implementation in the next version. The design never
4174 worked ever since the introduction of threads. Even programs which do
4175 not create threads themselves can use multiple threads created internally.
4179 * The following bugs are resolved with this release:
4181 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4182 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4183 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4184 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4187 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4189 * POWER7 optimizations: memset, memcmp, strncmp
4191 * New optimized string functions for x86-64: strnlen (SSE2),
4192 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4193 Implemented by Ulrich Drepper.
4197 * The following bugs are resolved with this release:
4199 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4200 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4201 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4202 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4203 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4204 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4205 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4206 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4208 * New interfaces: pthread_getname_np, pthread_setname_np
4210 * New Linux interface: recvmmsg
4212 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4214 * The dynamic linker now recognizes supported ABI versions from the
4215 EI_ABIVERSION field in the ELF header.
4216 Implemented by Ulrich Drepper.
4218 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4219 will not be used to fill in password fields in the passwd.byname replies.
4220 Instead it is used to synthesize the shadow.byname table, should it be
4221 missing. This is a useful mode in some installations involving Solaris.
4222 Implemented by Ulrich Drepper.
4224 * New locales: kok_IN, sq_MK, cv_RU
4228 * The following bugs are resolved with this release:
4230 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4231 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4232 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4233 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4234 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4235 10789, 10817, 10823, 10840, 10847
4237 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4239 Implemented by Ulrich Drepper.
4241 * Checking version of longjmp added that fails if an uninitialized stack
4242 frame would be created. Implemented by Ulrich Drepper.
4244 * STT_GNU_IFUNC is now supported in static executables.
4245 Implemented by H.J. Lu.
4247 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4249 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4250 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4251 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
4252 Contributed by H.J. Lu.
4254 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
4255 Implemented by Ulrich Drepper.
4257 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
4259 Contributed by H.J. Lu.
4261 * Support for fma instruction in AVX on x86-64.
4262 Implemented by H.J. Lu and Ulrich Drepper.
4264 * AVX support in x86-64 auditing support in ld.so.
4265 Implemented by H.J. Lu.
4267 * STB_GNU_UNIQUE support added.
4268 Implemented by Ulrich Drepper.
4270 * Implement second fallback mode for optimized DNS lookup for even more
4271 broken environments. If two requests from the same port are not
4272 handled correctly close the socket and open a new one before sending
4273 the second request. The 'single-request-reopen' option in /etc/resolv.conf
4274 can be used to select this mode right away, instead of rediscovering the
4275 necessity is every process again.
4276 Implemented by Ulrich Drepper.
4278 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
4279 Implemented by Adam Tkac.
4281 * Optimized iconv conversions for S390x.
4282 Implemented by Andreas Krebbel.
4284 * Using condvars with PI mutexes is now more efficient due to kernel
4285 support for requeueing to PI futexes. NPTL support added for x86-64.
4286 Implemented by Ulrich Drepper.
4288 * New locales: ps_AF, my_MM
4292 * The following bugs are resolved with this release:
4294 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
4295 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
4296 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
4297 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
4298 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
4300 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
4301 Implemented by Ulrich Drepper.
4303 * New Linux interfaces: accept4, fallocate, fallocate64.
4304 Implemented by Ulrich Drepper.
4306 * Correct declarations of string function when used in C++ code. This
4307 could lead to compile errors for invalid C++ code.
4309 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
4312 * New POSIX 2008 interface: psiginfo
4313 Implemented by Ulrich Drepper.
4315 * New ISO C++1x interfaces: quick_exit, at_quick_exit
4316 Implemented by Ulrich Drepper.
4318 * Support for selecting between multiple function definitions at runtime
4319 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
4321 * The libcrypt library can now use the hash function implementations in
4322 NSS. Implemented by Ulrich Drepper.
4324 * The malloc implementation can be compiled to be less memory efficient
4325 but higher performing in multi-threaded programs.
4326 Implemented by Ulrich Drepper.
4328 * New locales: nan_TW@latin, ks_IN
4330 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
4331 Implemented by Ulrich Drepper.
4333 * Extended printf hook support. It is possible to use user-defined types
4334 and extend existing format specifiers.
4335 Implemented by Ulrich Drepper.
4337 * Handling for group shadow files has been added.
4338 Implemented by Ulrich Drepper.
4340 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
4341 servers (the case, e.g., for some people using the built-in DNS
4342 server in ADSL modems/routers). There is a once-per-process timeout
4343 in case of a broken server. To avoid it, users can run nscd or put
4344 'options single-request' in /etc/resolv.conf.
4345 Implemented by Ulrich Drepper.
4349 * The following bugs are resolved with this release:
4351 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
4352 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
4353 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
4354 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
4355 6968, 6974, 6980, 6995, 7008, 7009, 7029
4357 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
4358 up at the same time. Implemented by Ulrich Drepper.
4360 * TLS descriptors for LD and GD on x86 and x86-64.
4361 Implemented by Alexandre Oliva.
4363 * getaddrinfo now handles DCCP and UDPlite.
4364 Implemented by Ulrich Drepper.
4366 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
4367 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
4368 Implemented by Ulrich Drepper.
4370 * New implementation of memmem, strstr, and strcasestr which is O(n).
4371 Implemented by Eric Blake.
4373 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
4375 * Implement "e" option for popen to open file descriptor with the
4376 close-on-exec flag set. Implemented by Ulrich Drepper.
4378 * Implement "b" mode for fmemopen. In this mode writes writes don't
4379 implicitly add a NUL byte and seeks from the end of the buffer really
4380 use the buffer end, not the string length as the basis.
4381 Implemented by Ulrich Drepper.
4383 * Many functions, exported and internal, now atomically set the close-on-exec
4384 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
4386 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
4388 Implemented by Pravin Satpute.
4390 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
4394 * The following bugs are resolved with this release:
4396 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
4397 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
4398 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
4399 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
4400 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
4401 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
4402 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
4404 * New locales: bo_CN, bo_IN, shs_CA.
4406 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
4408 * Sorting rules for some Indian languages (Devanagari and Gujarati).
4409 Implemented by Pravin Satpute.
4411 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
4413 * nscd caches now all timeouts for DNS entries
4414 Implemented by Ulrich Drepper.
4416 * nscd is more efficient and wakes up less often.
4417 Implemented by Ulrich Drepper.
4419 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
4420 vdprintf, and obstack_vprintf.
4421 Implemented by Jakub Jelinek.
4423 * Faster memset for x86-64.
4424 Implemented by Harsha Jagasia and H.J. Lu.
4426 * Faster memcpy on x86.
4427 Implemented by Ulrich Drepper.
4429 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
4430 Implemented by Ulrich Drepper.
4432 * Faster sqrt and sqrtf implemention for some PPC variants.
4433 Implemented by Steven Munroe.
4437 * The following bugs are resolved with this release:
4439 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
4440 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
4441 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
4442 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
4443 5071, 5103, 5104, 5112, 5113, 5184, 5186
4445 * More checking functions: fread, fread_unlocked, open*, mq_open.
4446 Implemented by Jakub Jelinek and Ulrich Drepper.
4448 * Extend fortification to C++. Implemented by Jakub Jelinek.
4450 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
4451 by not recognizing 'a' as a modifier when those specs are requested.
4452 Implemented by Jakub Jelinek.
4454 * PPC optimizations to math and string functions.
4455 Implemented by Steven Munroe.
4457 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
4458 options to be passed. Implemented by Ulrich Drepper.
4460 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
4462 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
4463 Implemented by Ulrich Drepper.
4465 * Handle private futexes in the NPTL implementation.
4466 Implemented by Jakub Jelinek and Ulrich Drepper.
4468 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
4469 Implemented by Roland McGrath and Ulrich Drepper.
4471 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
4473 * SHA-256 and SHA-512 based password encryption.
4474 Implemented by Ulrich Drepper.
4476 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
4477 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
4480 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
4481 Implemented by Ulrich Drepper.
4485 * The following bugs are resolved with this release:
4487 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
4488 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
4489 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
4490 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
4491 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
4492 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
4493 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
4496 * New Linux interfaces: epoll_pwait, sched_getcpu.
4498 * New generic interfaces: strerror_l.
4500 * nscd can now cache the services database. Implemented by Ulrich Drepper.
4504 * The following bugs are resolved with this release:
4506 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
4507 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
4508 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
4509 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
4510 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
4511 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
4512 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
4513 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
4514 3225, 3251, 3252, 3253, 3273
4516 * For Linux, the sorting of addresses returned by getaddrinfo now also
4517 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
4518 Implemented by Ulrich Drepper.
4520 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
4521 Implemented by Ulrich Drepper.
4523 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4525 * New iconv module for MIK. Contributed by Alexander Shopov.
4527 * For sites with broken group and/or passwd database, the auto-propagate
4528 option of nscd can prevent creating ID lookup entries from the results
4529 of a name lookup and vice versa. This usually is no problem but some
4530 site might have problems with the default behavior.
4531 Implemented by Ulrich Drepper.
4533 * Iterating over entire database in NIS can be slow. With the
4534 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4535 to trade time for memory. The entire database will be read at once.
4536 Implemented by Ulrich Drepper.
4538 * The interfaces introduced in RFC 3542 have been implemented by
4541 * Support for the new ELF hash table format was added by Ulrich Drepper.
4543 * Support for priority inheritance mutexes added by Jakub Jelinek and
4546 * Support for priority protected mutexes added by Jakub Jelinek.
4548 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4549 or_IN, csb_PL, fy_NL, sr_ME.
4553 * More overflow detection functions.
4555 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4556 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4558 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4559 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4560 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4561 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4562 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4563 by Masahide Washizawa.
4565 * It is now possible to install audit libraries for the dynamic linker using
4566 LD_AUDIT. Implemented by Ulrich Drepper.
4568 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4569 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4570 For a libc and libpthread that works well on Linux 2.4 kernels, we
4571 recommend using the stable 2.3 branch.
4573 * The new function open_wmemstream acts like open_memstream,
4574 but uses a wchar_t wide character buffer.
4576 * The new function ppoll is an improved version of poll, similar to pselect.
4578 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4579 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4580 renameat, unlinkat, linkat, symlinkat, readlinkat.
4582 * New Linux kernel system calls: unshare,
4583 inotify_init, inotify_add_watch, inotify_rm_watch.
4585 * The euidaccess function is now also known by the alias eaccess,
4586 for compatibility with some other systems.
4588 * Timezone data updated to 2006b version.
4592 * The following bugs are resolved with this release:
4594 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4595 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4596 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4597 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4598 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4599 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4601 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4603 * As of this release, GCC 4 can be used to compile the C Library.
4605 * Timezone data updated to 2005m version.
4609 * The following bugs are resolved with this release:
4611 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4612 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4613 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4614 777, 787, 821, 822, 823, 825
4616 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
4620 * Support for RFC 3678. Real implementations exist only for Linux so far.
4621 Implemented by Ulrich Drepper.
4623 * nscd can now cache entries persistently. Expiring entries are reloaded.
4624 For speedups the cache can be shared in memory with client processes.
4625 Implemented by Ulrich Drepper.
4627 * nscd can now perform SELinux checks.
4628 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4630 * getaddrinfo queries are now cached. Canonical name lookup is performed
4632 Implemented by Ulrich Drepper.
4634 * The nothrow function attribute is used when headers are used by gcc when
4635 compiling C code. This can avoid significant amounts of exception
4638 * The malloc functions perform more error checking and are stricter when
4639 it comes to reacting on errors. The default action is to terminate
4640 the process after showing an error message. Implemented by Ulrich Drepper.
4642 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4643 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
4645 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
4646 namespaces using the new function dlmopen(). This feature is of course,
4647 like most other dynamic loading functionality, not available in statically
4648 linked applications. Implemented by Ulrich Drepper.
4650 * Low-overhead boundary checking variants of string and some stdio functions
4651 were added. These are to be used in conjunction with a gcc patch by
4652 Jakub Jelinek which adds calls to these functions if possible.
4653 Implemented by Jakub Jelinek and Ulrich Drepper.
4655 * Old code for several operating systems and machine architectures that
4656 have not been in working condition in a long time have been removed from
4657 the main source tree maintained by the GNU C Library's maintainers.
4658 These files are now reside in the separate `ports' source module
4659 that is usable as an add-on when building the library.
4663 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4664 interrogate the dynamic linker, compatible with the Solaris interface.
4666 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4667 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4669 * getifaddrs now uses the netlink interface on Linux to get its information.
4670 Implemented by Thorsten Kukuk.
4672 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4673 Implemented by Ulrich Drepper.
4675 * support for non-executable stacks on x86 has been added. Changes mostly
4678 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
4681 * getaddrinfo now performs destination address selection according to
4686 * Thread-safe interfaces for many functions that access locale data
4687 were added in version 2.3, but these features were omitted from NEWS.
4688 Many functions have variants with an `_l' suffix that take a `locale_t'
4689 object as a parameter rather than consulting the current locale.
4690 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4691 create and maintain `locale_t' objects. Additionally, the new function
4692 `uselocale' sets "the current locale" (as used by functions not so
4693 parameterized) set for an individual thread. These features were added
4694 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4696 * The functions getresuid, getresgid, setresuid, and setresgid, which
4697 have long been available on Linux, are now declared in <unistd.h>
4698 and are now also available on the Hurd.
4700 * ELF thread-local storage support (TLS) now works on x86-64.
4702 * The new dynamic string token $LIB is expanded in shared library names.
4703 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4705 * Aldy Hernandez contributed complete software floating point support for
4706 PowerPC machines with no FPU.
4708 * fexecve is implemented on Linux.
4710 * The `btowc' function should work at least twice as fast due to
4711 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
4713 * With approriate thread add-ons cancelable functions are now implemented
4714 in libc.so as well. No need to call the function in libpthread. This
4715 change allowed to finally disable the incorrect and expensive handling
4716 of weak definition in ld.so.
4718 * Yet more PLT entries in libc.so have been removed. We finally arrived
4719 at the bare minimum. Startup times improved appropriately.
4721 * Support for the new Linux/x86 system call interface was added. The
4722 AT_SYSINFO auxiliary vector entry is recognized and handled.
4726 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4729 * iconv (the program and the interface) now accepts empty names (excluding
4730 options like //TRANSLIT) to mean "use charset of current locale".
4732 * localedef can now transliterate characters in strings which are not in
4733 the provided charmap. The information from the input locale is used.
4735 * Prelinking support was added for ELF targets. This requires additional
4736 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
4738 * Read-only stdio streams now use mmap to speed up operation by eliminating
4739 copying and buffer underflows. To use add 'm' to the mode string of
4740 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
4742 * The malloc functions were completely rewritten by Wolfram Gloger based
4743 on Doug Lea's malloc-2.7.0.c.
4745 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4746 implementation of regex.
4748 * Bruno Haible upgraded the iconv and locale implementation to support
4751 * Contents of the LC_* and LANG environment variables in the CEN style are
4752 not recognized anymore. It never was used. Change by Ulrich Drepper.
4754 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4755 thread-local storage (TLS) ABI on some platforms.
4756 Changes by Ulrich Drepper. SH support by Kaz Kojima.
4758 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4759 EUC-JISX0213, and TSCII.
4761 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4762 BSD-compatible interface for getting all network interface addresses.
4763 Implementation for IPv4 by Roland McGrath.
4765 * Loading of locale data is faster due to the introduction of a locale
4766 archive. Implemented by Roland McGrath and Ulrich Drepper.
4768 * Startup times are significantly reduced by not using exported functions
4769 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
4772 * Steven Munroe contributed a port to PowerPC64/Linux.
4776 * The Hurd now uses the GNU libio implementation of stdio rather than the
4777 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4779 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4780 with the same behavior as the Linux system call of the same name.
4784 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4785 128-bit long double format.
4787 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4788 IBM1161, and IBM1162 charsets.
4790 * Andreas Jaeger contributed a port to x86-64/Linux.
4792 * Peter Bruin contributed a port to PowerPC/Hurd.
4794 * libc functions using I/O streams now can handle wide-oriented streams
4797 * optimizations in the dynamic linker. Binaries created by recent binutils
4798 versions start up quicker due to reduced time spent on relocations.
4800 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
4804 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
4805 asinh, atanh, j0 for the 128-bit long double format.
4807 * Bruno Haible updated all the code handling Unicode in some form to
4808 support Unicode 3.1.
4810 * Speed of regex for single-byte locales is back to previous levels.
4811 Patch by Isamu Hasegawa.
4813 * Alpha, SPARC, and IA-64 now also using floating stacks.
4815 * Startup time of internationalized applications greatly improved through
4816 iconv cache. Use iconvconfig to generate the cache file.
4817 Contributed by Ulrich Drepper.
4819 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
4820 severe performance problems. Patch by David Mosberger.
4822 * The Hurd port got a lot more functionality like AIO, various stdio
4823 extensions, etc. Mainly done by Roland McGrath.
4825 * mtrace can now lookup symbols in shared libraries.
4829 * Intel's IA-64 math library is largely integrated. It provides fast and
4830 accurate implementatations for most basic and standard math functions
4831 in float, double, and long double format.
4833 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
4834 and asin for the 96-bit long double format and asin, log, tan for the
4835 128-bit long double format.
4837 * The beginning of a last-bit accurate math library by IBM Haifa were added.
4838 The basic double functions exist today. Contributed by Abraham Ziv
4839 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
4840 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
4842 * An asynchronous name lookup library was added. The interface is designed
4843 after POSIX AIO. The proposal was circulated beforehand to get comments.
4844 No negative ones came in. Implemented by Ulrich Drepper.
4846 * Port to S390/64bit contributed by Martin Schwidefsky
4847 <schwidefsky@de.ibm.com>.
4849 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
4850 of functions for Linux/IA-64.
4852 * The RPC code is now thread safe. Threads can now use the same service
4853 of different services at the same time. Patch by Eric Norum
4854 <eric.norum@usask.ca> with some help by Ulrich Drepper.
4856 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
4857 family of functions for Linux/S390.
4859 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
4860 of functions for Linux/x86.
4862 * Port to Linux/CRIS contributed by Axis Communications.
4866 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
4867 we can now check for namespace violations and missing declarations. The
4868 result is that almost all headers are now Unix-compliant (as defined in
4869 the upcoming XPG6). The negative side is that some programs might need
4870 corrections, too, if they depend on the incorrect form of the headers in
4871 previous versions which defined too many symbols and included too many
4874 * regex now handles multibyte character sets correctly.
4875 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
4877 * iconv (the program) does now conform to the upcoming XPG6 and handles
4878 charmaps. Instead of the charset names the path of charmaps can be
4879 provided and the conversion happens based on this data.
4880 Contributed by Ulrich Drepper.
4882 * The locale program now provides detailed information about the installed
4887 only lists the names of the supported locales
4891 provides details such as country, language, and codeset name.
4892 Contributed by Ulrich Drepper.
4896 * The gencat program now parses the input file according to the charset
4897 selected by the LC_CTYPE category. This is important for stateful
4898 character sets. To make generating catalogs easier there is a way
4899 to overwrite the charset selected by the locale: before the first
4900 message or $ quote line the catalog can contain a line like
4902 $ codeset=ISO-8859-2
4904 to select the charset (ISO-8859-2 in this case).
4906 Implemented by Shinya Hanataka and Ulrich Drepper.
4908 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
4909 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
4910 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
4912 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
4913 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
4915 * The LANGUAGE environment variable is now ignored unless the locale is
4916 changed from the default "C" locale.
4918 * The usual bug fixes.
4922 * Greg McGary added runtime support for bounds checking using gcc's
4923 new -fbounded-pointers option. ix86 target is complete. PowerPC
4926 * Thorsten Kukuk added secure mode support to nscd.
4928 * The Berkeley db libraries have been removed.
4930 Related, the nss_db module is now in a separate package since it
4931 obviously requires a database library being available.
4933 * Wide character I/O streams implemented by Ulrich Drepper.
4935 * Functions from the extended socket API added by Ulrich Drepper.
4937 * Functions feenableexcept and fedisableexcept to control the
4938 behaviour of individual exceptions have been added by Andreas Jaeger.
4940 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
4942 * The resolver code has been updated from bind 8.2.3-T5B which supports
4943 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
4946 This change could in some situations effect backward compatibility. Since
4947 now `_res' is a thread-local instead of a global variable, modifying it
4948 in one thread does not have any effect in other threads.
4950 The resolver library was also extended to allow IPv6 as the transport
4951 protocol for the requests. This work was done by Stig Venaas.
4953 * Compatibility code for K&R C compilers has been removed from the
4954 header files. A ISO C compiler is needed to use the library
4955 (conforming to either C89 or C99 standard).
4957 * Complete rewrite of the localedef program to support multibyte character
4958 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
4959 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
4960 Implemented by Ulrich Drepper.
4962 Bruno Haible significantly improved the generation and use of the data
4963 structures for the wide character tables.
4965 * Plural handling in gettext implemented by Ulrich Drepper.
4967 * The utmp daemon has been removed.
4969 * The port to MIPS-Linux has been finished by Andreas Jaeger.
4971 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
4974 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
4976 * POSIX barriers implemented by Kaz Kylheku.
4978 * POSIX spawn function family implemented by Ulrich Drepper.
4980 * POSIX spinlocks are now available.
4982 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
4984 * the configure option --enable-kernel=X.Y.Z allows to strip out
4985 compatibility for kernel versions before X.Y.Z. This is currently only
4986 implemented for Linux.
4988 * the sockaddr_in6 structure changed. The IPv6 working group added a new
4989 field sin6_scope_id. This means that all programs using IPv6 should be
4990 recompiled. Don't expect binary compatibility with previous glibc
4993 * various conversion modules for IBM character sets contributed by
4996 * IA-64 port by Jes Sorensen and HJ Lu.
5010 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5012 * New xdr functions are added; some rpc functions are now 64bit clean.
5014 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5016 * Fixed known incompatibilities with glibc 2.0.
5018 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5020 * Optimized a number of functions (especially the ELF dynamic loader).
5022 * Update timezone data files.
5024 * lots of charmaps corrections
5026 * some new locale definitions and charmaps
5031 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5032 conform to POSIX member type requirements. Symbol versions have been
5033 adjusted as needed within the library, and for direct use by applications,
5034 but there is potential for problems if third-party libraries use
5035 struct timeval as part of their interface. This does not present
5036 a problem for X and other "essential" system libraries.
5038 * An additional locale model to support C++ Standard Library locale
5039 model and probably more was implemented by Ulrich Drepper.
5041 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5044 * Miles Bader provided the `argp' function family to support hierachical
5045 command line argument parsing, layered on top of getopt.
5047 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5049 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5052 * scanf recognizes the %a and %A format for scanning floating point numbers.
5054 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5055 information and interfaces for the available integer types.
5057 * about 130 new math functions were added to implement the ISO C9x math
5060 * the new header <complex.h> contains definitions of the complex math
5061 functions from ISO C 9X.
5063 * the new header <tgmath.h> defines generic macros to use complex or
5064 real valued functions.
5066 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5068 * Andreas Jaeger provided a test suite for the math library.
5070 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5072 * Ulrich Drepper added character set conversion functions (iconv).
5074 * Optimized string functions have been added.
5076 * The localedata addon is now part of glibc.
5078 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5080 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5081 daemon for NSS (nscd).
5083 Missing a better place here are some numbers on improvements. Under
5084 Linux 2.1.125 un-tar-ing the kernel sources takes
5088 using local files 12.19s 6.88s 22.91s
5090 using NIS 13.92s 8.91s 26.34s
5092 using NIS & nscd 10.37s 7.34s 25.30s
5094 using NIS+ 27.57s 30.37s 640.46s
5096 using NIS+ & nscd 10.25s 7.83s 26.51s
5098 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5100 Keep in mind that non-namelookup related operations dominate above times.
5101 It was just a common complain that using NIS+ unpacking the kernel is
5104 [1] The old nscd implementation is not available anymore since it was
5105 distributed with glibc up to version 2.0.98 and thus is now replaced.
5107 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5109 * Mark Kettenis provided a Hesiod NSS module.
5111 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5112 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5114 * rcmd can now handle netgroups (Dick Streefland).
5116 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5119 * Support for the IPv6 protocol has been added to the socket API, as per the
5120 latest draft standards.
5122 * Support for Linux 2.2 has been added.
5124 * Interface changes relative to the latest 2.0.x release:
5125 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5126 addseverity NEW: Unix98
5127 alphasort64 NEW: LFS
5128 argp_err_exit_status NEW: argp, GNU ext
5129 argp_error NEW: argp, GNU ext
5130 argp_failure NEW: argp, GNU ext
5131 argp_help NEW: argp, GNU ext
5132 argp_parse NEW: argp, GNU ext
5133 argp_program_bug_address NEW: argp, GNU ext
5134 argp_program_version NEW: argp, GNU ext
5135 argp_program_version_hook NEW: argp, GNU ext
5136 argp_state_help NEW: argp, GNU ext
5137 argp_usage NEW: argp, GNU ext
5138 authdes_create NEW: Secure RPC
5139 authdes_getucred NEW: Secure RPC
5140 authdes_pk_create NEW: Secure RPC
5141 backtrace NEW: GNU ext.
5142 backtrace_symbols NEW: GNU ext.
5143 backtrace_symbols_fd NEW: GNU ext.
5145 cacosf NEW: ISO C 9x
5146 cacosh NEW: ISO C 9x
5147 cacoshf NEW: ISO C 9x
5148 cacoshl NEW: ISO C 9x
5149 cacosl NEW: ISO C 9x
5156 casinf NEW: ISO C 9x
5157 casinh NEW: ISO C 9x
5158 casinhf NEW: ISO C 9x
5159 casinhl NEW: ISO C 9x
5160 casinl NEW: ISO C 9x
5162 catanf NEW: ISO C 9x
5163 catanh NEW: ISO C 9x
5164 catanhf NEW: ISO C 9x
5165 catanhl NEW: ISO C 9x
5166 catanl NEW: ISO C 9x
5167 cbc_crypt NEW: Secure RPC
5171 ccoshf NEW: ISO C 9x
5172 ccoshl NEW: ISO C 9x
5178 cimagf NEW: ISO C 9x
5179 cimagl NEW: ISO C 9x
5180 clearerr_locked REMOVED
5181 clntunix_create NEW: sunrpc ext
5183 clog10 NEW: ISO C 9x
5184 clog10f NEW: ISO C 9x
5185 clog10l NEW: ISO C 9x
5195 cprojf NEW: ISO C 9x
5196 cprojl NEW: ISO C 9x
5198 crealf NEW: ISO C 9x
5199 creall NEW: ISO C 9x
5204 csinhf NEW: ISO C 9x
5205 csinhl NEW: ISO C 9x
5208 csqrtf NEW: ISO C 9x
5209 csqrtl NEW: ISO C 9x
5213 ctanhf NEW: ISO C 9x
5214 ctanhl NEW: ISO C 9x
5216 des_setparity NEW: Secure RPC
5217 ecb_crypt NEW: Secure RPC
5218 endutxent NEW: Unix98
5220 exp10f NEW: ISO C 9x
5221 exp10l NEW: ISO C 9x
5225 fattach NEW: STREAMS
5226 fdetach NEW: STREAMS
5230 feclearexcept NEW: ISO C 9x
5231 fegetenv NEW: ISO C 9x
5232 fegetexceptflag NEW: ISO C 9x
5233 fegetround NEW: ISO C 9x
5234 feholdexcept NEW: ISO C 9x
5236 feraiseexcept NEW: ISO C 9x
5237 ferror_locked REMOVED
5238 fesetenv NEW: ISO C 9x
5239 fesetexceptflag NEW: ISO C 9x
5240 fesetround NEW: ISO C 9x
5241 fetestexcept NEW: ISO C 9x
5242 feupdateenv NEW: ISO C 9x
5243 fflush_locked REMOVED
5247 fgets_unlocked NEW: GNU ext.
5248 fileno_locked REMOVED
5260 fputc_locked REMOVED
5261 fputs_unlocked NEW: GNU ext.
5262 fread_unlocked NEW: GNU ext.
5267 fstatvfs NEW: Unix98
5271 ftruncate64 NEW: LFS
5273 fwrite_unlocked NEW: GNU ext.
5274 gai_strerror NEW: IPv6
5278 getchar_locked REMOVED
5280 getdate_err NEW: Unix98
5281 getdate_r NEW: GNU ext.
5283 getnameinfo NEW: IPv6
5284 getnetname NEW: Secure RPC
5285 getpmsg NEW: STREAMS
5286 getpt NEW: Unix98 PTY
5287 getrlimit64 NEW: LFS
5288 getutxent NEW: Unix98
5289 getutxid NEW: Unix98
5290 getutxline NEW: Unix98
5291 glob64 NEW: GNU ext.
5292 globfree64 NEW: GNU ext.
5293 gnu_get_libc_release NEW: GNU ext.
5294 gnu_get_libc_version NEW: GNU ext.
5295 grantpt NEW: Unix98 PTY
5296 host2netname NEW: Secure RPC
5298 iconv_close NEW: iconv
5299 iconv_open NEW: iconv
5300 if_freenameindex NEW: IPv6
5301 if_indextoname NEW: IPv6
5302 if_nameindex NEW: IPv6
5303 if_nametoindex NEW: IPv6
5304 in6addr_any NEW: IPv6
5305 in6addr_loopback NEW: IPv6
5306 inet6_isipv4mapped NEW: IPv6
5307 isastream NEW: STREAMS
5308 iswblank NEW: GNU ext.
5309 key_decryptsession NEW: Secure RPC
5310 key_decryptsession_pk NEW: Secure RPC
5311 key_encryptsession NEW: Secure RPC
5312 key_encryptsession_pk NEW: Secure RPC
5313 key_gendes NEW: Secure RPC
5314 key_get_conv NEW: Secure RPC
5315 key_secretkey_is_set NEW: Secure RPC
5316 key_setnet NEW: Secure RPC
5317 key_setsecret NEW: Secure RPC
5318 llrint NEW: ISO C 9x
5319 llrintf NEW: ISO C 9x
5320 llrintl NEW: ISO C 9x
5321 llround NEW: ISO C 9x
5322 llroundf NEW: ISO C 9x
5323 llroundl NEW: ISO C 9x
5328 lrintf NEW: ISO C 9x
5329 lrintl NEW: ISO C 9x
5330 lround NEW: ISO C 9x
5331 lroundf NEW: ISO C 9x
5332 lroundl NEW: ISO C 9x
5334 makecontext NEW: Unix98
5335 mempcpy NEW: GNU ext.
5338 modify_ldt NEW: kernel
5342 nearbyint NEW: ISO C 9x
5343 nearbyintf NEW: ISO C 9x
5344 nearbyintl NEW: ISO C 9x
5345 netname2host NEW: Secure RPC
5346 netname2user NEW: Secure RPC
5347 nexttoward NEW: ISO C 9x
5348 nexttowardf NEW: ISO C 9x
5349 nexttowardl NEW: ISO C 9x
5353 passwd2des NEW: Secure RPC
5355 pow10f NEW: GNU ext.
5356 pow10l NEW: GNU ext.
5359 printf_size NEW: GNU ext.
5360 printf_size_info NEW: GNU ext.
5361 profil_counter REMOVED
5362 pthread_mutexattr_getkind_np REPLACED
5363 pthread_mutexattr_setkind_np REPLACED
5364 ptsname NEW: Unix98 PTY
5365 ptsname_r NEW: Unix98 PTY
5367 putchar_locked REMOVED
5368 putgrent NEW: GNU ext.
5370 putpmsg NEW: STREAMS
5371 pututxline NEW: Unix98
5375 readdir64_r NEW: LFS
5376 remquo NEW: ISO C 9x
5377 remquof NEW: ISO C 9x
5378 remquol NEW: ISO C 9x
5380 roundf NEW: ISO C 9x
5381 roundl NEW: ISO C 9x
5383 scalbln NEW: ISO C 9x
5384 scalblnf NEW: ISO C 9x
5385 scalblnl NEW: ISO C 9x
5387 sendfile NEW: kernel
5388 setcontext NEW: Unix98
5389 setrlimit64 NEW: LFS
5390 setutxent NEW: Unix98
5392 sigignore NEW: Unix98
5393 sigqueue NEW: POSIX.1b
5394 sigrelse NEW: Unix98
5395 sigset NEW: POSIX.1b
5396 sigtimedwait NEW: POSIX.1b
5397 sigwaitinfo NEW: POSIX.1b
5398 sincos NEW: GNU ext.
5399 sincosf NEW: GNU ext.
5400 sincosl NEW: GNU ext.
5404 strcasestr NEW: GNU ext.
5405 strtoimax NEW: ISO C 9x
5406 strtoumax NEW: ISO C 9x
5407 strverscmp NEW: GNU ext.
5408 svcauthdes_stats NEW: Secure RPC
5409 svcunix_create NEW: sunrpc etx
5410 svcunixfd_create NEW: sunrpc ext
5411 swapcontext NEW: Unix98
5412 tcgetsid NEW: Unix98 PTY
5413 tdestroy NEW: GNU ext.
5414 tgamma NEW: ISO C 9x
5415 tgammaf NEW: ISO C 9x
5416 tgammal NEW: ISO C 9x
5420 truncf NEW: ISO C 9x
5421 truncl NEW: ISO C 9x
5423 unlockpt NEW: Unix98 PTY
5424 updwtmpx NEW: Unix98
5425 user2netname NEW: Secure RPC
5426 utmpxname NEW: Unix98
5427 versionsort NEW: GNU ext.
5428 versionsort64 NEW: GNU ext.
5430 wcscasecmp NEW: GNU ext.
5431 wcsncasecmp NEW: GNU ext.
5432 wcsnlen NEW: GNU ext.
5433 wcstoimax NEW: ISO C 9x
5434 wcstoll NEW: ISO C 9x
5435 wcstoull NEW: ISO C 9x
5436 wcstoumax NEW: ISO C 9x
5438 wordexp NEW: POSIX.2
5439 wordfree NEW: POSIX.2
5440 write_profiling REMOVED
5441 xdecrypt NEW: Secure RPC
5442 xdr_authdes_cred NEW: Secure RPC
5443 xdr_authdes_verf NEW: Secure RPC
5444 xdr_cryptkeyarg NEW: Secure RPC
5445 xdr_cryptkeyarg2 NEW: Secure RPC
5446 xdr_cryptkeyres NEW: Secure RPC
5447 xdr_getcredres NEW: Secure RPC
5448 xdr_key_netstarg NEW: Secure RPC
5449 xdr_key_netstres NEW: Secure RPC
5450 xdr_keybuf NEW: Secure RPC
5451 xdr_keystatus NEW: Secure RPC
5452 xdr_netnamestr NEW: Secure RPC
5453 xdr_sizeof NEW: Secure RPC
5454 xdr_unixcred NEW: sunrpc ext
5455 xencrypt NEW: Secure RPC
5456 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5467 * inet_ntoa is thread-safe
5469 * updwtmp is moved from libutil to libc
5471 * rewrite of cbrt function
5473 * update of timezone data
5487 * add atoll function
5489 * fix complex problems in Berkeley DB code
5491 * fix math functions
5495 * fixed lots of header problems (especially Linux/GNU specific)
5497 * dynamic loader preserves all registers
5499 * Roland McGrath provided support for handling of auxiliary objects in
5500 the ELF dynamic loader.
5502 * support for parallel builds is improved
5506 * GNU extensions are no longer declared by default. To enable them you
5507 must define the macro `_GNU_SOURCE' in your program or compile with
5510 * The library has changed from using GNU ld symbol aliases to using weak
5511 symbols where available. The ELF object file format supports weak
5512 symbols; GNU ld also supports weak symbols in the a.out format. (There
5513 is also now support for other GNU ld extensions in ELF. Use the
5514 `--with-elf' option to configure to indicate you have ELF, and
5515 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
5516 of many files which contained only symbol aliases, reducing the size of
5517 the source and the compiled library; many other files were renamed to
5518 less cryptic names previously occupied by the symbol alias files.
5519 There is a new header file <elf.h> for programs which operate on
5520 files in the ELF format.
5522 * Converted to Autoconf version 2, so `configure' has more options.
5523 Run `configure --help' to see the details.
5525 * The library can now be configured to build profiling, highly-optimized
5526 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5527 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5528 `configure' enable building these extra libraries. The shared library is
5529 built by default when using both ELF and GNU ld. When shared libraries
5530 are enabled, the new library `-ldl' is available for arbitrary run-time
5531 loading of shared objects; its interface is defined in <dlfcn.h>. The
5532 new header file <link.h> gives access to the internals of the run-time
5533 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5534 application of same name on other systems and it provides information
5535 about dynamically linked binaries.
5537 * The C library now provides the run-time support code for profiling
5538 executables compiled with `-pg'. Programs can control the profiling code
5539 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5540 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5541 the support for this file format was contributed by David Mosberger-Tang.
5543 * The math code has been replaced with a math library based on fdlibm from
5544 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5545 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5546 functions. The math functions now reside in a separate library, so
5547 programs using them will need to use `-lm' their linking commands.
5549 * John C. Bowman contributed optimized ix87 assembler inline functions.
5551 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5552 mechanism similar to that found in Solaris 2. This is now used for the
5553 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5554 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5555 file controls what services are used for each individual database. This
5556 works by loading shared libraries with names specified in `nsswitch.conf',
5557 so service modules can be changed or added at any time without even
5558 relinking any program. Currently there are the file, db, and NIS based
5559 NSS services available.
5561 * The new functions `strtoq' and `strtouq' parse integer values from
5562 strings, like `strtol' and `strtoul', but they return `long long int' and
5563 `unsigned long long int' values, respectively (64-bit quantities).
5565 * The new functions `strtof' and `strtold' parse floating-point values from
5566 strings, like `strtod', but they return `float' and `long double' values,
5567 respectively (on some machines `double' and `long double' are the same).
5569 * Ulrich Drepper has contributed new implementations of the floating-point
5570 printing and reading code used in the `printf' family of functions and
5571 `strtod', `strtof', and `strtold'. These new functions are perfectly
5572 accurate, and much faster than the old ones.
5574 * The implementation of the POSIX locale model was completely rewritten by
5575 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5576 to compile the POSIX locale definition.
5578 * The former dummy implementations of the strcoll and strxfrm function are
5579 now replaced by fully functional code contributed by Ulrich Drepper. The
5580 collation information comes from the POSIX locale definitions.
5582 * The new header <langinfo.h> defines an interface for accessing
5583 various locale-dependent data (using the locale chosen with `setlocale').
5585 * Ulrich Drepper has contributed a new suite of functions for operation on
5586 wide-character and multibyte-character strings, in <wchar.h>;
5587 and classification and case conversion of wide characters, in <wctype.h>.
5588 These new functions are conforming to the ISO C, Amendement 1 specification.
5590 * There is now a second implementation of the standard I/O library available.
5591 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5592 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5594 * You can now use positional parameter specifications in format strings
5595 for the `printf' and `scanf' families of functions. For example,
5596 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5597 ``Number 6, Mr Jones''. This is mainly useful when providing different
5598 format strings for different languages, whose grammars may dictate
5599 different orderings of the values being printed. To support this
5600 feature, the interface for `register_printf_handler' has changed; see
5601 the header file <printf.h> for details.
5603 * The `printf' and `scanf' families of functions now understand a new
5604 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5605 to group numbers as indicated by the locale; for `scanf' and friends, this
5606 says to accept as valid only a number with all the proper grouping
5607 separators in the right places. In the default "C" locale, numbers are
5608 not grouped; but locales for specific countries will define the usual
5609 conventions (i.e. separate thousands with `,' in the US locale).
5611 * The pgrp functions have been regularized, slightly incompatibly but much
5612 less confusingly. The core functions are now `getpgid' and `setpgid',
5613 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5614 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5615 provided for compatibility. There is no longer an incompatible `getpgrp'
5616 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5618 * The new header file <fts.h> and suite of functions simplify programs that
5619 operate on directory trees. This code comes from 4.4 BSD.
5621 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5622 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5623 NSS scheme used in glibc.
5625 * There is a new malloc debugging hook `__memalign_hook'.
5627 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5628 `unsigned int' in <sys/types.h>. These are for compatibility only and
5629 their use is discouraged.
5631 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5632 done differently, so that it works even without GNU ld.
5634 * New function `euidaccess' checks allowed access to a file like `access',
5635 but using the effective IDs instead of the real IDs.
5637 * The time zone data files have been updated for the latest and greatest
5638 local time conventions of the countries of the world.
5640 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5643 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5644 for formatting floating-point numbers. They are provided only for
5645 compatibility; new programs should use `sprintf' instead. There are
5646 also equivalent function for the `long double' floating-point type and
5647 all functions also exist in a reentrant form.
5649 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5650 functions for maintaining the login-record files (primarily of use to
5651 system programs such as `login'), and convenient functions for
5652 allocating and initializing a pseudo-terminal (pty) device.
5654 * Ulrich Drepper has contributed new support for System V style
5655 shared memory and IPC on systems that support it.
5657 * Ulrich Drepper has contributed several miscellaneous new functions found
5658 in System V: The `hsearch' family of functions provide an effective
5659 implementation of hash tables; `a64l' and `l64a' provide a very simple
5660 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5663 * Ulrich Drepper has contributed new reentrant counterparts for the
5664 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5666 * Ulrich Drepper has contributed new, highly-optimized versions of several
5667 string functions for the i486/Pentium family of processors.
5669 * Ulrich Drepper has updated the Linux-specific code, based largely
5670 on work done in Hongjiu Lu's version of GNU libc for Linux.
5671 The GNU library now supports Linux versions 2.0.10 and later,
5672 using the ELF object file format (i[3456]86-*-linux).
5674 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5676 * David Mosberger-Tang and Richard Henderson have ported the C library
5677 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
5678 dynamic linking support for ELF/Alpha.
5680 * Richard Henderson contributed several Alpha optimized assembler function
5681 for arithmetic and string handling.
5683 * Ulrich Drepper has contributed a new set of message catalog functions to
5684 support multiple languages using the <libintl.h> interface, for use with
5685 his new package GNU gettext. Translation volunteers have contributed
5686 catalogs of the library's messages in Spanish, German, and Korean.
5688 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5689 program and the `catgets' function for reading the catalog files it
5690 creates. (The <libintl.h> interface is preferred; we include the
5691 <nl_types.h> interface using `catgets' only for source compatibility with
5692 programs already written to use it.)
5694 * New header file <values.h> gives SVID-compatible names for <limits.h>
5697 * Various new macros, declarations, and small header files for compatibility
5700 * New function `group_member' is a convenient way to check if a process has
5701 a given effective group ID.
5703 * When using GCC 2.7 and later, the socket functions are now declared in a
5704 special way so that passing an argument of type `struct sockaddr_in *',
5705 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5706 `struct sockaddr *' type, does not generate a type-clash warning.
5708 * New function `error' declared in header file <error.h> is a convenient
5709 function for printing error messages and optionally exiting; this is the
5710 canonical function used in GNU programs. The new functions `err', `warn',
5711 and friends in header file <err.h> are the canonical 4.4 BSD interface for
5712 doing the same thing.
5714 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5715 POSIX.2 `glob' function to do ~ and {...} expansion.
5717 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5718 `clearenv' which is used in POSIX.9 is also available.
5720 * New function `getsid' returns session ID number on systems that support it.
5722 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
5723 files <db.h> and <mpool.h> provide a rich set of functions for several
5724 types of simple databases stored in memory and in files, and <ndbm.h> is
5725 an old `ndbm'-compatible interface using the `db' functions. Link with
5726 `-ldb' to get these functions.
5728 * New macro `strdupa' copies a string like `strdup', but uses local stack
5729 space from `alloca' instead of dynamic heap space from `malloc'.
5731 * New function `strnlen' is like `strlen' but searches only a given maximum
5732 number of characters for the null terminator. `stpncpy', `strndup' and
5733 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5736 * New function `statfs' in header <sys/statfs.h>.
5738 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5739 provide convenient functions for operating on blocks of null-terminated
5742 * A new suite of functions in <utmp.h> handle all the details of reading
5743 and writing the utmp file.
5745 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5748 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5749 completely POSIX compliant and also implemented the extended functionality
5750 to handle alternate digit representation and alternate era date formats.
5752 * Ulrich Drepper provided an implementation of the `strptime' function
5753 defined in XPG4.2 which transforms a string into a `struct tm' value.
5755 * Paul Eggert provided the tzselect shell script as part of the timezone
5756 code. The shell script makes it easy to select the correct timezone
5759 * The implementation of the malloc family of functions is completely replaced
5760 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5761 The implementation uses the mmap function (if available) and it is
5762 optimized for the use in multi threaded programs.
5764 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5765 functions. This new functionality is usable by specifying a special
5766 salt string and it is compatible with implementation on *BSD systems.
5768 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5769 `getsubopt' to handle second level command line options, `bsd_signal'
5770 to access BSD style `signal' functionality, the obsolete `regexp' style
5773 * the `lchown' function is available on system which support this
5776 * The implementation of the shadow password handling function was contributed
5779 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5781 * POSIX.1g support was added. The <sys/select.h> header is available,
5782 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
5783 implementation of `getaddrinfo'.
5787 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5789 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5790 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
5792 * The new function `daemon' from 4.4 BSD is useful for server programs that
5793 want to put themselves in the background.
5795 * Joel Sherrill has contributed support for several standalone boards that
5796 run without an operating system.
5798 * `printf', `scanf' and friends now accept a `q' type modifier for long
5799 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
5801 * All of the code taken from BSD (notably most of the math and networking
5802 routines) has been updated from the BSD 4.4-Lite release.
5804 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
5806 * The new functions `getdomainname' and `setdomainname' fetch or change the
5807 YP/NIS domain name. These are system calls which exist on systems which
5810 * The time zone data files have been updated for the latest international
5813 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
5814 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
5818 * The C library now includes support for Sun RPC, from Sun's free
5819 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
5820 are included. (There is still no support for YP.)
5822 * Tom Quinn has contributed a port of the C library to SGI machines running
5823 Irix 4 (mips-sgi-irix4).
5825 * The new `lockf' function is a simplified interface to the locking
5826 facilities of `fcntl', included for compatibility.
5828 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
5830 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
5832 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
5835 * The error message printed by `assert' for a failed assertion now includes
5836 the name of the program (if using GNU ld) and the name of the calling
5837 function (with versions of GCC that support this).
5839 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
5841 * The library now includes the <sys/mman.h> header file and memory
5842 management functions `mmap', `munmap', `mprotect', `msync', and
5843 `madvise', on systems that support those facilities.
5845 * The interface for `mcheck' has changed slightly: the function called to
5846 abort the program when an allocation inconsistency is detected now takes
5847 an argument that indicates the type of failure. The new function
5848 `mprobe' lets you request a consistency check for a particular block at
5849 any time (checks are normally done only when you call `free' or `realloc'
5852 * It is now possible to easily cross-compile the C library, building on one
5853 system a library to run on another machine and/or operating system. All
5854 you need to do is set the variable `HOST_CC' in `configparms' to the
5855 native compiler for programs to run on the machine you are building on (a
5856 few generator programs are used on Unix systems); set `CC' to the
5859 * The new function `fexecve' (only implemented on the GNU system) executes
5860 a program file given a file descriptor already open on the file.
5864 * Brendan Kehoe has contributed most of a port to the DEC Alpha
5865 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
5867 * You can set the variable `libprefix' in `configparms' to specify a prefix
5868 to be prepended to installed library files; this makes it easy to install
5869 the GNU C library to be linked as `-lgnuc' or whatever.
5871 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
5872 copies a limited number of characters from a string, and returns the
5873 address of the last character written.
5875 * You no longer need to check for whether the installed `stddef.h' is
5876 compatible with the GNU C library. configure now checks for you.
5878 * You can now define a per-stream `fileno' function to convert the
5879 stream's cookie into an integral file descriptor.
5881 * ``malloc (0)'' no longer returns a null pointer. Instead, it
5882 allocates zero bytes of storage, and returns a unique pointer which
5883 you can pass to `realloc' or `free'. The behavior is undefined if
5884 you dereference this pointer.
5886 * The C library now runs on Sony NEWS m68k machines running either
5887 NewsOS 3 or NewsOS 4.
5889 * The new `syscall' function is a system-dependent primitive function
5890 for invoking system calls. It has the canonical behavior on Unix
5891 systems, including unreliable return values for some calls (such as
5892 `pipe', `fork' and `getppid').
5894 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
5895 to `EAGAIN', which is the preferred name. On systems whose kernels
5896 use two distinct codes, the C library now translates EWOULDBLOCK to
5897 EAGAIN in every system call function.
5901 * The GNU C Library Reference Manual is now distributed with the library.
5902 `make dvi' will produce a DVI file of the printed manual.
5903 `make info' will produce Info files that you can read on line using C-h i
5904 in Emacs or the `info' program.
5905 Please send comments on the manual to bug-glibc-manual@gnu.org.
5907 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
5909 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
5911 * Jason Merrill has contributed a port to the Sequent Symmetry running
5912 Dynix version 3 (i386-sequent-dynix).
5914 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
5915 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
5917 * New function `memory_warnings' lets you arrange to get warnings when
5918 malloc is running out of memory to allocate, like Emacs gives you.
5920 * The C library now contains the relocating allocator used in Emacs 19 for
5921 its editing buffers. This allocator (ralloc) minimizes allocation
5922 overhead and fragmentation by moving allocated regions around whenever it
5923 needs to. You always refer to a ralloc'd region with a "handle" (a
5924 pointer to a pointer--an object of type `void **').
5926 * There is a new `printf' format: `%m' gives you the string corresponding
5927 to the error code in `errno'.
5929 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
5930 or `%[' conversion, but instead of filling in a fixed-sized buffer you
5931 pass, the `a' modifier says to fill in a `char **' you pass with a
5934 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
5935 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
5936 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
5938 * `mkstemp' is a traditional Unix function to atomically create and open a
5939 uniquely-named temporary file.
5943 * The standard location for the file that says what the local timezone is
5944 has changed again. It is now `/usr/local/etc/localtime' (or more
5945 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
5947 * The distribution no longer contains any files with names longer than 14
5950 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
5951 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
5953 * New functions `ttyslot' and `syslog' from 4.4 BSD.
5957 * The configuration process has changed quite a bit. The `configure'
5958 script is now used just like the configuration scripts for other GNU
5959 packages. The `sysdeps' directory hierarchy is much rearranged.
5960 The file `INSTALL' explains the new scheme in detail.
5962 * The header files no longer need to be processed into ANSI C and
5963 traditional C versions. There is just one set of files to install, and
5964 it will work with ANSI or old C compilers (including `gcc -traditional').
5966 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
5967 MIPS DECStation running Ultrix 4.
5969 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
5970 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
5971 made itself into a shared library.
5973 * Yet further improved support for the i386, running 4.3 BSD-like systems
5974 (such as Mach 3 with the Unix single-server), or System V.
5976 * New function `strncasecmp' to do case-insensitive string comparison
5977 with limited length.
5979 * New function `strsep' is a reentrant alternative to `strtok'.
5981 * New functions `scandir' and `alphasort' for searching directories.
5983 * New function `setenv' is a better interface to `putenv'.
5985 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
5986 function for traversing a directory tree.
5988 * The GNU obstack package is now also part of the C library.
5989 The new function `open_obstack_stream' creates a stdio stream that
5990 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
5991 formatted output directly to an obstack.
5993 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
5994 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
5996 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
5998 * The new functions `strfry' and `memfrob' do mysterious and wonderful
5999 things to your strings.
6001 * There are some new test programs: test-fseek, testmb, and testrand.
6003 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6004 These ports are not finished, but are a good starting place for really
6005 supporting those systems.
6007 * `/etc/localtime' is now the standard location for the file that says what
6008 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6009 This follows the general principle that `/etc' is the place for all local
6010 configuration files.
6012 * The C library header files now use `extern "C"' when used by the C++
6013 compiler, so the C library should now work with C++ code.
6015 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6016 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6019 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6020 function which uses the `merge sort' algorithm, and is said to be
6021 significantly faster than the old GNU `qsort' function. Merge sort is
6022 now the standard `qsort' function. The new algorithm can require a lot
6023 of temporary storage; so, the old sorting function is called when the
6024 required storage is not available.
6026 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6027 provides the Unix `crypt' function, plus some other entry points.
6029 * The code and header files taken from 4.4 BSD have been updated with the
6030 latest files released from Berkeley.
6032 ----------------------------------------------------------------------
6033 Copyright information:
6035 Copyright (C) 1992-2020 Free Software Foundation, Inc.
6037 Permission is granted to anyone to make or distribute verbatim copies
6038 of this document as received, in any medium, provided that the
6039 copyright notice and this permission notice are preserved,
6040 thus giving the recipient permission to redistribute in turn.
6042 Permission is granted to distribute modified versions
6043 of this document, or of portions of it,
6044 under the above conditions, provided also that they
6045 carry prominent notices stating who last changed them.
6048 version-control: never