1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2019 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 12.1.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 12.1.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * The dynamic linker accepts the --preload argument to preload shared
17 objects, in addition to the LD_PRELOAD environment variable.
19 * The twalk_r function has been added. It is similar to the existing
20 twalk function, but it passes an additional caller-supplied argument
21 to the callback function.
23 * On Linux, the getdents64, gettid, and tgkill functions have been added.
25 * Minguo (Republic of China) calendar support has been added as an
26 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
29 * The entry for the new Japanese era has been added for ja_JP locale.
31 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
32 pvalloc, memalign, and posix_memalign fail now with total object size
33 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
34 pointer subtraction within the allocated object, where results might
35 overflow the ptrdiff_t type.
37 * The dynamic linker no longer refuses to load objects which reference
38 versioned symbols whose implementation has moved to a different soname
39 since the object has been linked. The old error message, symbol
40 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
41 link time reference, is gone.
43 Deprecated and removed features, and other changes affecting compatibility:
45 * The copy_file_range function fails with ENOSYS if the kernel does not
46 support the system call of the same name. Previously, user space
47 emulation was performed, but its behavior did not match the kernel
48 behavior, which was deemed too confusing. Applications which use the
49 copy_file_range function can no longer rely on glibc to provide a fallback
50 on kernels that do not support the copy_file_range system call, and if
51 this function returns ENOSYS, they will need to use their own fallback.
52 Support for copy_file_range for most architectures was added in version
53 4.5 of the mainline Linux kernel.
55 * The functions clock_gettime, clock_getres, clock_settime,
56 clock_getcpuclockid, clock_nanosleep were removed from the librt library
57 for new applications (on architectures which had them). Instead, the
58 definitions in libc will be used automatically, which have been available
61 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
62 and <sys/stropts.h> have been removed.
64 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
65 resolver flag (deprecated in glibc 2.25) have been removed.
67 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
68 resolver have been removed from <resolv.h>.
70 * With --enable-bind-now, installed programs are now linked with the
73 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
74 configurations) has been removed, following the deprecation of this
75 subarchitecture in version 8 of GCC, and its removal in version 9.
77 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
78 header have been removed.
80 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
81 deprecated and will be removed from a future version of glibc.
82 Application should directly access /proc instead. For obtaining random
83 bits, the getentropy function can be used.
85 Changes to build and runtime requirements:
87 * GCC 6.2 or later is required to build the GNU C Library.
89 Older GCC versions and non-GNU compilers are still supported when
90 compiling programs that use the GNU C Library.
92 Security related changes:
94 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
95 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
96 has undefined behavior. On x32, the size_t argument may be passed
97 in the lower 32 bits of the 64-bit RDX register with non-zero upper
98 32 bits. When it happened with the sign bit of RDX register set,
99 memcmp gave the wrong result since it treated the size argument as
100 zero. Reported by H.J. Lu.
102 CVE-2019-9169: Attempted case-insensitive regular-expression match
103 via proceed_next_node in posix/regexec.c leads to heap-based buffer
104 over-read. Reported by Hongxu Chen.
106 The following bugs are resolved with this release:
108 [The release manager will add the list generated by
109 scripts/list-fixed-bugs.py just before the release.]
116 * The getcpu wrapper function has been added, which returns the currently
117 used CPU and NUMA node. This function is Linux-specific.
119 * A new convenience target has been added for distribution maintainers
120 to build and install all locales as directories with files. The new
121 target is run by issuing the following command in your build tree:
122 'make localedata/install-locale-files', with an optional DESTDIR
123 to set the install root if you wish to install into a non-default
126 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
128 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
129 for _GNU_SOURCE, to match BSD environments.
131 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
132 indicates that it will abort the transaction prior to entering the kernel
133 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
134 suspended, and this caused some undefined side-effects issues by aborting
135 transactions manually. Glibc avoided it by abort transactions manually on
136 each syscall, but it lead to performance issues on newer kernels where the
137 HTM state is saved and restore lazily (the state being saved even when the
138 process actually does not use HTM).
140 * The functions posix_spawn_file_actions_addchdir_np and
141 posix_spawn_file_actions_addfchdir_np have been added, enabling
142 posix_spawn and posix_spawnp to run the new process in a different
143 directory. These functions are GNU extensions. The function
144 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
147 * The popen and system do not run atfork handlers anymore (BZ#17490).
148 Although it is a possible POSIX violation, the POSIX rationale in
149 pthread_atfork documentation regarding atfork handlers is to handle
150 inconsistent mutex state after a fork call in a multi-threaded process.
151 In both popen and system there is no direct access to user-defined mutexes.
153 * Support for the C-SKY ABIV2 running on Linux has been added. This port
154 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
156 - C-SKY ABIV2 soft-float little-endian
157 - C-SKY ABIV2 hard-float little-endian
159 * strftime's default formatting of a locale's alternative year (%Ey)
160 has been changed to zero-pad the year to a minimum of two digits,
161 like "%y". This improves the display of Japanese era years during
162 the first nine years of a new era, and is expected to be harmless
163 for all other locales (only Japanese locales regularly have
164 alternative year numbers less than 10). Zero-padding can be
165 overridden with the '_' or '-' flags (which are GNU extensions).
167 * As a GNU extension, the '_' and '-' flags can now be applied to
168 "%EY" to control how the year number is formatted; they have the
169 same effect that they would on "%Ey".
171 Deprecated and removed features, and other changes affecting compatibility:
173 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
174 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
176 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
177 in <sys/procfs.h>, has been corrected to match the type actually used by
178 the Linux kernel. This affects the size and layout of that structure on
179 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
181 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
182 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
183 defined in <sys/procfs.h>, has been corrected to match the type actually
184 used by the Linux kernel. This affects the size and layout of those
187 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
188 meant to scan a string and allocate space for it with malloc, is now
189 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
190 defined. This extension conflicts with C99's use of '%a' to scan a
191 hexadecimal floating-point number, which is now available to programs
192 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
194 POSIX.1-2008 includes the feature of allocating a buffer for string input
195 with malloc, using the modifier letter 'm' instead. Programs using
196 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
197 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
198 C99 '%a' no longer need to avoid _GNU_SOURCE.
200 GCC's -Wformat warnings can detect most uses of this extension, as long
201 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
202 __attribute__ ((format (scanf, ...))).
204 Changes to build and runtime requirements:
206 * Python 3.4 or later is required to build the GNU C Library.
208 * On most architectures, GCC 5 or later is required to build the GNU C
209 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
211 Older GCC versions and non-GNU compilers are still supported when
212 compiling programs that use the GNU C Library.
214 Security related changes:
216 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
217 denial of service due to resource exhaustion when processing getaddrinfo
218 calls with crafted host names. Reported by Guido Vranken.
220 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
221 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
222 happened, accessing the 32-bit size_t value as the full 64-bit register
223 in the assembly string/memory functions would cause a buffer overflow.
226 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
227 addresses with arbitrary trailing characters, potentially leading to data
228 or command injection issues in applications.
230 The following bugs are resolved with this release:
232 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
233 [10496] localedata: 12h time representation in multiple locales faulty
234 [10797] localedata: it_IT locale numeric does not have a separator for
236 [11319] libc: dprintf doesn't handle errors properly
237 [16346] time: mktime: potentially unsafe use of localtime_offset
238 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
240 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
241 posix_spawn_file_actions_addfchdir_np
242 [17426] localedata: Indian locales: set the correct date format
243 [17490] stdio: popen should not invoke atfork handlers
244 [17783] libc: TIOCSER_TEMT conditions inconsistent
245 [18040] regex: use-after-free in regexec/get_subexp
246 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
247 [20018] network: getaddrinfo should reject IP addresses with trailing
248 characters (CVE-2016-10739)
249 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
250 [20271] libc: Missing "\n" in __libc_fatal calls
251 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
252 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
253 pointer argument is non-NULL
254 [21037] stdio: open_memstream and freopen
255 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
256 [21716] time: Crash in glibc's mktime in low-memory situations
257 [22834] stdio: Subprocess forked by popen may crash in Linux when
258 multithreads call popen
259 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
260 and pthread_create fails.
261 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
262 [23125] libc: riscv64: endless loop when throwing an exception from a
264 [23275] nptl: Race in pthread_mutex_lock while promoting to
265 PTHREAD_MUTEX_ELISION_NP.
266 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
268 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
270 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
272 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
273 [23509] dynamic-link: CET enabled glibc is incompatible with the older
275 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
276 [23521] nss: get_next_alias nss_files file stream leak
277 [23538] nptl: Hang in pthread_cond_broadcast
278 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
279 [23578] regex: Invalid memory access if regex pattern contains NUL byte
280 [23579] libc: Errors misreported in preadv2
281 [23597] build: support/test-container.c doesn't work with different
283 [23603] time: mktime signed integer overflow on large timestamps
284 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
285 [23614] libc: powerpc: missing CFI register information in __mpn_*
287 [23637] string: Generic strstr/strcasestr fails with huge needles
288 [23640] libc: no way to easily clear FD_CLOEXEC in
289 posix_spawn_file_actions_adddup2()
290 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
292 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
294 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
295 [23689] libc: Bug in documentation for rusage.ru_ixrss in
296 bits/types/struct_rusage.h
297 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
299 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
301 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
302 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
303 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
305 [23724] localedata: Albanian date formats are incorrect
306 [23735] math: libnldbl_nonshared.a references internal libm symbols
307 [23740] localedata: kl_GL: Month names and date formats need update
308 [23744] regex: regex refactorings to remove BE, avoid duplication
309 [23745] time: mktime fix for Gnulib + coreutils
310 [23758] time: Improve the width of alternate representation for year in
312 [23783] libc: [mips] Missing CMSPAR bits/termios.h
313 [23789] time: mktime does not set errno on failure
314 [23791] localedata: Wrong monetary format for ca_ES locale
315 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
316 [23794] locale: c16rtomb does not handle surrogate pairs
317 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
318 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
319 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
320 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
321 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
322 [23862] libc: [sh] missing kernel-features.h undefines
323 [23864] libc: [riscv] missing kernel-features.h undefines
324 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
325 [23907] malloc: Incorrect double-free malloc tcache check disregards
327 [23913] libc: off-by-one in function maybe_script_execute in
328 sysdeps/posix/spawni.c
329 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
330 [23923] locale: Add --no-hard-links option to localedef
331 [23927] network: Linux if_nametoindex() does not close descriptor
333 [23961] math: powf can overflow to inf without setting errno in non-
334 nearest rounding mode
335 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
336 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
337 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
338 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
339 [24011] localedata: Fixed small type in comment for locale bs_BA
340 [24018] libc: gettext() may return NULL
341 [24022] build: riscv build failure with Linux kernel 4.20-rc7
342 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
343 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
345 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
346 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
348 [24046] localedata: en_US locale doesn't define date_fmt
349 [24063] manual: @var{errno} should be @code{errno}
350 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
351 [24088] libc: VSCR field is not being correctly read in ucontext_t on
353 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
355 [24097] string: Can't use 64-bit register for size_t in assembly codes for
357 [24110] hurd: SS_DISABLE never set in stack_t value returned by
359 [24112] network: Do not send DNS queries for non-host names (where all
360 answers will be rejected)
361 [24130] libc: alpha __remqu corrupts $f3 register
368 * The localization data for ISO 14651 is updated to match the 2016
369 Edition 4 release of the standard, this matches data provided by
370 Unicode 9.0.0. This update introduces significant improvements to the
371 collation of Unicode characters. This release deviates slightly from
372 the standard in that the collation element ordering for lowercase and
373 uppercase LATIN script characters is adjusted to ensure that regular
374 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
375 is not matched by [a-z]. With the update many locales have been
376 updated to take advantage of the new collation information. The new
377 collation information has increased the size of the compiled locale
378 archive or binary locales.
380 * The GNU C Library can now be compiled with support for Intel CET, AKA
381 Intel Control-flow Enforcement Technology. When the library is built
382 with --enable-cet, the resulting glibc is protected with indirect
383 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
384 compatible with all existing executables and shared libraries. This
385 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
386 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
387 capable of multi-byte NOPs, like x86-64 processors as well as Intel
388 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
389 x86_64 and x32 on non-CET processors. --enable-cet has been tested
390 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
393 * The GNU C Library now has correct support for ABSOLUTE symbols
394 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
395 relocated incorrectly or in some cases discarded. The GNU linker can
396 make use of the newer semantics, but it must communicate it to the
397 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
398 field) to indicate such support is required.
400 * Unicode 11.0.0 Support: Character encoding, character type info, and
401 transliteration tables are all updated to Unicode 11.0.0, using
402 generator scripts contributed by Mike FABIAN (Red Hat).
404 * <math.h> functions that round their results to a narrower type are added
405 from TS 18661-1:2014 and TS 18661-3:2015:
407 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
410 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
413 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
416 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
419 * Two grammatical forms of month names are now supported for the following
420 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
421 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
422 support two grammatical forms in abbreviated month names: Catalan, Greek,
425 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
426 include the support for two grammatical forms of month names.
428 * Building and running on GNU/Hurd systems now works without out-of-tree
431 * The renameat2 function has been added, a variant of the renameat function
432 which has a flags argument. If the flags are zero, the renameat2 function
433 acts like renameat. If the flag is not zero and there is no kernel
434 support for renameat2, the function will fail with an errno value of
435 EINVAL. This is different from the existing gnulib function renameatu,
436 which performs a plain rename operation in case of a RENAME_NOREPLACE
437 flags and a non-existing destination (and therefore has a race condition
438 that can clobber the destination inadvertently).
440 * The statx function has been added, a variant of the fstatat64
441 function with an additional flags argument. If there is no direct
442 kernel support for statx, glibc provides basic stat support based on
443 the fstatat64 function.
445 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
446 library if installed. libidn2 version 2.0.5 or later is recommended. If
447 libidn2 is not available, internationalized domain names are not encoded
448 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
449 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
450 with an encoding error.) Flags which used to change the IDN encoding and
451 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
452 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
453 deprecated. They no longer have any effect.
455 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
456 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
457 range of ELF gABI expressions including such constructs as
458 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
459 have been further restricted, and where in the past a dynamic string
460 token sequence may have been interpreted as a literal string it will
461 now cause a load failure. These load failures were always considered
462 unspecified behaviour from the perspective of the dynamic loader, and
463 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
464 results in a load failure now.
466 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
467 implementation includes all the standard functions provided by
470 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
471 thrd_detach, thrd_exit, and thrd_join for thread management.
473 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
474 mtx_destroy for mutual exclusion.
476 - call_once for function call synchronization.
478 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
479 cnd_wait for conditional variables.
481 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
483 Application developers must link against libpthread to use ISO C threads.
485 Deprecated and removed features, and other changes affecting compatibility:
487 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
488 installed. Software that was using either header should be updated to
489 use standard <stdio.h> interfaces instead.
491 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
492 This was never required by the C standard, and the macros just expanded
493 to call alternative names for the same functions. If you hoped getc and
494 putc would provide performance improvements over fgetc and fputc, instead
495 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
496 necessary, flockfile and funlockfile.
498 * All stdio functions now treat end-of-file as a sticky condition. If you
499 read from a file until EOF, and then the file is enlarged by another
500 process, you must call clearerr or another function with the same effect
501 (e.g. fseek, rewind) before you can read the additional data. This
502 corrects a longstanding C99 conformance bug. It is most likely to affect
503 programs that use stdio to read interactive input from a terminal.
506 * The macros 'major', 'minor', and 'makedev' are now only available from
507 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
508 headers that happen to include <sys/types.h>. These macros are rarely
509 used, not part of POSIX nor XSI, and their names frequently collide with
510 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
513 <sys/sysmacros.h> is a GNU extension. Portable programs that require
514 these macros should first include <sys/types.h>, and then include
515 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
517 * The tilegx*-*-linux-gnu configurations are no longer supported.
519 * The obsolete function ustat is no longer available to newly linked
520 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
521 function has been deprecated in favor of fstatfs and statfs.
523 * The obsolete function nfsservctl is no longer available to newly linked
524 binaries. This function was specific to systems using the Linux kernel
525 and could not usefully be used with the GNU C Library on systems with
526 version 3.1 or later of the Linux kernel.
528 * The obsolete function name llseek is no longer available to newly linked
529 binaries. This function was specific to systems using the Linux kernel
530 and was not declared in a header. Programs should use the lseek64 name
531 for this function instead.
533 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
534 getaddrinfo and getnameinfo functions have been deprecated. The behavior
535 previously selected by them is now always enabled.
537 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
538 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
539 restriction (rejecting '_' in host names, among other things) has been
540 removed, for increased compatibility with non-IDN name resolution.
542 * The fcntl function now have a Long File Support variant named fcntl64. It
543 is added to fix some Linux Open File Description (OFD) locks usage on non
544 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
545 fcntl and LFS support is handled transparently. Also for Linux, the OFD
546 locks act as a cancellation entrypoint.
548 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
549 ecb_crypt, and des_setparity are no longer available to newly linked
550 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
551 longer installed. These functions encrypted and decrypted data with the
552 DES block cipher, which is no longer considered secure. Software that
553 still uses these functions should switch to a modern cryptography library,
556 * Reflecting the removal of the encrypt and setkey functions above, the
557 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
558 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
561 * The obsolete function fcrypt is no longer available to newly linked
562 binaries. It was just another name for the standard function crypt,
563 and it has not appeared in any header file in many years.
565 * We have tentative plans to hand off maintenance of the passphrase-hashing
566 library, libcrypt, to a separate development project that will, we hope,
567 keep up better with new passphrase-hashing algorithms. We will continue
568 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
569 'crypt_r' should not need to change at all; however, distributions will
570 need to install <crypt.h> and libcrypt from a separate project.
572 In this release, if the configure option --disable-crypt is used, glibc
573 will not install <crypt.h> or libcrypt, making room for the separate
574 project's versions of these files. The plan is to make this the default
575 behavior in a future release.
577 Changes to build and runtime requirements:
579 GNU make 4.0 or later is now required to build glibc.
581 Security related changes:
583 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
584 been fixed by removing the glibc-internal IDNA implementation and using
585 the system-provided libidn2 library instead. Originally reported by Hanno
586 Böck and Christian Weisgerber.
588 CVE-2017-18269: An SSE2-based memmove implementation for the i386
589 architecture could corrupt memory. Reported by Max Horn.
591 CVE-2018-11236: Very long pathname arguments to realpath function could
592 result in an integer overflow and buffer overflow. Reported by Alexey
595 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
596 architecture could write beyond the target buffer, resulting in a buffer
597 overflow. Reported by Andreas Schwab.
599 The following bugs are resolved with this release:
601 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
602 [6889] manual: 'PWD' mentioned but not specified
603 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
604 when __WORDSIZE != 64
605 [13762] regex: re_search etc. should return -2 on memory exhaustion
606 [13888] build: /tmp usage during testing
607 [13932] math: dbl-64 pow unexpectedly slow for some inputs
608 [14092] nptl: Support C11 threads
609 [14095] localedata: Review / update collation data from Unicode / ISO
611 [14508] libc: -Wformat warnings
612 [14553] libc: Namespace pollution loff_t in sys/types.h
613 [14890] libc: Make NT_PRFPREG canonical.
614 [15105] libc: Extra PLT references with -Os
615 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
617 [16335] manual: Feature test macro documentation incomplete and out of
619 [16552] libc: Unify umount implementations in terms of umount2
620 [17082] libc: htons et al.: statement-expressions prevent use on global
621 scope with -O1 and higher
622 [17343] libc: Signed integer overflow in /stdlib/random_r.c
623 [17438] localedata: pt_BR: wrong d_fmt delimiter
624 [17662] libc: please implement binding for the new renameat2 syscall
625 [17721] libc: __restrict defined as /* Ignore */ even in c11
626 [17979] libc: inconsistency between uchar.h and stdint.h
627 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
628 [18023] libc: extend_alloca is broken (questionable pointer comparison,
629 horrible machine code)
630 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
632 [18471] libc: llseek should be a compat symbol
633 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
635 [18991] nss: nss_files skips large entry in database
636 [19239] libc: Including stdlib.h ends up with macros major and minor being
638 [19463] libc: linknamespace failures when compiled with -Os
639 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
640 [19527] locale: Normalized charset name not recognized by setlocale
641 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
642 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
644 [19728] network: out of bounds stack read in libidn function
645 idna_to_ascii_4i (CVE-2016-6261)
646 [19729] network: out of bounds heap read on invalid utf-8 inputs in
647 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
648 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
650 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
651 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
652 [20419] dynamic-link: files with large allocated notes crash in
654 [20530] libc: bswap_16 should use __builtin_bswap16() when available
655 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
656 [20980] manual: CFLAGS environment variable replaces vital options
657 [21163] regex: Assertion failure in pop_fail_stack when executing a
658 malformed regexp (CVE-2015-8985)
659 [21234] manual: use of CFLAGS makes glibc detect no optimization
660 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
661 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
662 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
663 [21508] locale: intl/tst-gettext failure with latest msgfmt
664 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
665 [21812] network: getifaddrs() returns entries with ifa_name == NULL
666 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
668 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
670 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
671 [22247] network: Integer overflow in the decode_digit function in
672 puny_decode.c in libidn (CVE-2017-14062)
673 [22342] nscd: NSCD not properly caching netgroup
674 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
675 [22550] localedata: es_ES locale (and other es_* locales): collation
676 should treat ñ as a primary different character, sync the collation
677 for Spanish with CLDR
678 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
679 by gcc configured with --enable-default-pie
680 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
681 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
682 crossing 2GB threshold (CVE-2017-18269)
683 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
685 [22735] time: Misleading typo in time.h source comment regarding
687 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
688 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
689 `__assert_perror_fail ()' to `__assert_fail_base ()'
690 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
692 [22786] libc: Stack buffer overflow in realpath() if input size is close
693 to SSIZE_MAX (CVE-2018-11236)
694 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
695 through an absolute DT_NEEDED path
696 [22792] build: tcb-offsets.h dependency dropped
697 [22797] libc: pkey_get() uses non-reserved name of argument
698 [22807] libc: PTRACE_* constants missing for powerpc
699 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
700 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
701 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
702 [22848] localedata: ca_ES: update date definitions from CLDR
703 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
704 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
705 [22896] localedata: Update locale data for an_ES
706 [22902] math: float128 test failures with GCC 8
707 [22918] libc: multiple common of `__nss_shadow_database'
708 [22919] libc: sparc32: backtrace yields infinite backtrace with
710 [22926] libc: FTBFS on powerpcspe
711 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
713 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
714 [22947] libc: FAIL: misc/tst-preadvwritev2
715 [22963] localedata: cs_CZ: Add alternative month names
716 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
717 [22996] localedata: change LC_PAPER to en_US in es_BO locale
718 [22998] dynamic-link: execstack tests are disabled when SELinux is
720 [23005] network: Crash in __res_context_send after memory allocation
722 [23007] math: strtod cannot handle -nan
723 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
724 [23036] regex: regex equivalence class regression
725 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
726 [23069] libc: sigaction broken on riscv64-linux-gnu
727 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
728 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
729 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
730 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
731 and libc build with -Os)
732 [23140] localedata: More languages need two forms of month names
733 [23145] libc: _init/_fini aren't marked as hidden
734 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
735 [23171] math: C++ iseqsig for long double converts arguments to double
736 [23178] nscd: sudo will fail when it is run in concurrent with commands
737 that changes /etc/passwd
738 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
740 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
741 [23208] localedata: New locale - Lower Sorbian (dsb)
742 [23233] regex: Memory leak in build_charclass_op function in file
744 [23236] stdio: Harden function pointers in _IO_str_fields
745 [23250] nptl: Offset of __private_ss differs from GCC
746 [23253] math: tgamma test suite failures on i686 with -march=x86-64
747 -mtune=generic -mfpmath=sse
748 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
750 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
751 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
753 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
754 [23277] math: nan function should not have const attribute
755 [23279] math: scanf and strtod wrong for some hex floating-point
756 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
758 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
759 [23303] build: undefined reference to symbol
760 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
761 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
763 [23313] stdio: libio vtables validation and standard file object
765 [23329] libc: The __libc_freeres infrastructure is not properly run across
767 [23349] libc: Various glibc headers no longer compatible with
769 [23351] malloc: Remove unused code related to heap dumps and malloc
771 [23363] stdio: stdio-common/tst-printf.c has non-free license
772 [23396] regex: Regex equivalence regression in single-byte locales
773 [23422] localedata: oc_FR: More updates of locale data
774 [23442] build: New warning with GCC 8
775 [23448] libc: Out of bounds access in IBM-1390 converter
776 [23456] libc: Wrong index_cpu_LZCNT
777 [23458] build: tst-get-cpu-features-static isn't added to tests
778 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
780 [23467] dynamic-link: x86/CET: A property note parser bug
787 * The GNU C Library can now be compiled with support for building static
788 PIE executables (See --enable-static-pie in INSTALL). These static PIE
789 executables are like static executables but can be loaded at any address
790 and provide additional security hardening benefits at the cost of some
791 memory and performance. When the library is built with --enable-static-pie
792 the resulting libc.a is usable with GCC 8 and above to create static PIE
793 executables using the GCC option '-static-pie'. This feature is currently
794 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
795 aarch64 with binutils 2.30 or later.
797 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
798 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
801 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
803 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
805 * In order to support faster and safer process termination the malloc API
806 family of functions will no longer print a failure address and stack
807 backtrace after detecting heap corruption. The goal is to minimize the
808 amount of work done after corruption is detected and to avoid potential
809 security issues in continued process execution. Reducing shutdown time
810 leads to lower overall process restart latency, so there is benefit both
811 from a security and performance perspective.
813 * The abort function terminates the process immediately, without flushing
814 stdio streams. Previous glibc versions used to flush streams, resulting
815 in deadlocks and further data corruption. This change also affects
816 process aborts as the result of assertion failures.
818 * On platforms where long double has the IEEE binary128 format (aarch64,
819 alpha, mips64, riscv, s390 and sparc), the math library now implements
820 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
821 These are the same interfaces added in version 2.26 for some platforms where
822 this format is supported but is not the format of long double.
824 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
825 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
826 implements interfaces for that type, as defined by ISO/IEC TS
827 18661-3:2015. These are corresponding interfaces to those supported for
830 * The math library now implements interfaces for the _Float32, _Float64 and
831 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
832 corresponding interfaces to those supported for _Float128.
834 * glibc now implements the memfd_create and mlock2 functions on Linux.
836 * Support for memory protection keys was added. The <sys/mman.h> header now
837 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
840 * The copy_file_range function was added.
842 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
844 * The ldconfig utility now processes `include' directives using the C/POSIX
845 collation ordering. Previous glibc versions used locale-specific
846 ordering, the change might break systems that relied on that.
848 * Support for two grammatical forms of month names has been added.
849 In a call to strftime, the "%B" and "%b" format specifiers will now
850 produce the grammatical form required when the month is used as part
851 of a complete date. New "%OB" and "%Ob" specifiers produce the form
852 required when the month is named by itself. For instance, in Greek
853 and in many Slavic and Baltic languages, "%B" will produce the month
854 in genitive case, and "%OB" will produce the month in nominative case.
856 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
857 are all valid and will all accept any known form of month
858 name---standalone or complete, abbreviated or full. In a call to
859 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
860 the strings used by "%B" and "%b", respectively. New query
861 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
862 used by "%OB" and "%Ob", respectively.
864 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
865 define the strings for %OB and %Ob, respectively; these have the
866 same syntax as "mon" and "abmon". These arrays are optional; if they
867 are not provided then they have the same content as "mon" and "abmon",
870 These features are provided for locales which define "alt_mon" and/or
871 "ab_alt_mon" in their locale source data. This release includes such
872 alternative month name data for the following languages: Belarusian,
873 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
875 This feature is currently a GNU extension, but it is expected to
876 be added to the next revision of POSIX, and it is also already
877 available on some BSD-derived operating systems.
879 This feature will cause existing statically compiled applications
880 to fail to load locales and fall back to the builtin C/POSIX locales.
881 See notes below for other changes affecting compatibility.
883 * Support for the RISC-V ISA running on Linux has been added. This port
884 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
885 for the following ISA and ABI pairs:
891 Deprecated and removed features, and other changes affecting compatibility:
893 * Statically compiled applications attempting to load locales compiled for the
894 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
895 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
896 support for two grammatical forms of the month names, also extends the locale
897 data binary format. Static applications needing locale support must be
898 recompiled to match the runtime and data they are deployed with. In some
899 distributions there is an upgrade window where dynamically linked applications
900 may use a new library but the old locale data and also fall back to the
901 builtin C/POSIX locales; restarting the application process is sufficient to
904 * Support for statically linked applications which call dlopen is deprecated
905 and will be removed in a future version of glibc. Applications which call
906 dlopen need to be linked dynamically instead.
908 * Support for old programs which use internal stdio data structures and
909 functions is deprecated. This includes programs which use the C++ streams
910 provided by libstdc++ in GCC 2.95. Programs which use the internal
911 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
912 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
913 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
914 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
915 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
916 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
917 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
918 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
919 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
920 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
921 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
922 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
923 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
924 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
925 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
926 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
927 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
928 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
929 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
930 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
931 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
932 future version of glibc. Unlike other symbol removals, these old
933 applications will not be supported using compatibility symbols.
935 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
936 defined by <sys/ptrace.h>.
938 * libm no longer supports SVID error handling (calling a user-provided
939 matherr function on error) or the _LIB_VERSION variable to control error
940 handling. (SVID error handling and the _LIB_VERSION variable still work
941 for binaries linked against older versions of the GNU C Library.) The
942 libieee.a library is no longer provided. math.h no longer defines struct
943 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
944 TLOSS, PLOSS and HUGE.
946 * The libm functions pow10, pow10f and pow10l are no longer supported for
947 new programs. Programs should use the standard names exp10, exp10f and
948 exp10l for these functions instead.
950 * The mcontext_t type is no longer the same as struct sigcontext. On
951 platforms where it was previously the same, this changes the C++ name
952 mangling for interfaces involving this type.
954 * The add-ons mechanism for building additional packages at the same time as
955 glibc has been removed. The --enable-add-ons configure option is now
958 * The --without-fp configure option is now ignored. Whether hardware
959 floating-point instructions are used is now configured based on whether
960 the compiler used at configure time (without any options implied by a
961 --with-cpu= configure option) uses such instructions.
963 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
964 the specified string can be parsed as a domain name.
966 * In the malloc_info output, the <heap> element may contain another <aspace>
967 element, "subheaps", which contains the number of sub-heaps.
969 * The libresolv function p_secstodate is no longer supported for new
972 * The tilepro-*-linux-gnu configuration is no longer supported.
974 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
975 and will be removed in a future release. Software that is still using
976 either header should be updated to use standard <stdio.h> interfaces
979 libio.h was originally the header for a set of supported GNU extensions,
980 but they have not been maintained as such in many years, they are now
981 standing in the way of improvements to stdio, and we don't think there are
982 any remaining external users. _G_config.h was never intended for public
983 use, but predates the bits convention.
985 Changes to build and runtime requirements:
987 * bison version 2.7 or later is required to generate code in the 'intl'
990 Security related changes:
992 CVE-2009-5064: The ldd script would sometimes run the program under
993 examination directly, without preventing code execution through the
994 dynamic linker. (The glibc project disputes that this is a security
995 vulnerability; only trusted binaries must be examined using the ldd
998 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
999 suffered from a one-byte overflow during ~ operator processing (either
1000 on the stack or the heap, depending on the length of the user name).
1001 Reported by Tim Rühsen.
1003 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
1004 would sometimes fail to free memory allocated during ~ operator
1005 processing, leading to a memory leak and, potentially, to a denial
1008 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
1009 without GLOB_NOESCAPE, could write past the end of a buffer while
1010 unescaping user names. Reported by Tim Rühsen.
1012 CVE-2017-17426: The malloc function, when called with an object size near
1013 the value SIZE_MAX, would return a pointer to a buffer which is too small,
1014 instead of NULL. This was a regression introduced with the new malloc
1015 thread cache in glibc 2.26. Reported by Iain Buclaw.
1017 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
1018 to the allocation of too much memory. (This is not a security bug per se,
1019 it is mentioned here only because of the CVE assignment.) Reported by
1022 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
1023 of the number of search path components. (This is not a security
1024 vulnerability per se because no trust boundary is crossed if the fix for
1025 CVE-2017-1000366 has been applied, but it is mentioned here only because
1026 of the CVE assignment.) Reported by Qualys.
1028 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
1029 for AT_SECURE or SUID binaries could be used to load libraries from the
1032 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
1033 succeeds without returning an absolute path due to unexpected behaviour
1034 of the Linux kernel getcwd syscall. Reported by halfdog.
1036 CVE-2018-6485: The posix_memalign and memalign functions, when called with
1037 an object size near the value of SIZE_MAX, would return a pointer to a
1038 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
1040 CVE-2018-6551: The malloc function, when called with an object size near
1041 the value of SIZE_MAX, would return a pointer to a buffer which is too
1042 small, instead of NULL.
1044 The following bugs are resolved with this release:
1046 [866] glob: glob should match dangling symlinks
1047 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1048 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1050 [5997] math: Very slow execution of sinf function
1051 [10580] localedata: hr_HR: updated locale
1052 [10871] locale: 'mon' array should contain both nominative and genitive
1054 [12349] localedata: eu_ES: incorrect thousands separator
1055 [13605] localedata: shn_MM: new Shan locale
1056 [13805] localedata: ru_RU: currency should use ',' as radix point
1057 [13953] localedata: km_KH: locale update
1058 [13994] localedata: mjw_IN: new locale
1059 [14121] build: make writes .mo files in po directory
1060 [14333] libc: Fix the race between atexit() and exit()
1061 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1062 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1064 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1065 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1066 width Latin characters
1067 [15332] localedata: es_CU: locale update
1068 [15436] stdio: Don't close or flush stdio streams on abort
1069 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1071 [16148] localedata: ca_ES: incorrect thousands separator
1072 [16750] dynamic-link: ldd should not try to execute the binaries
1074 [16777] localedata: pl_PL: incorrect thousands separator in locale
1075 [16905] localedata: hanzi: new collation
1076 [17563] localedata: cmn_TW: add hanzi collation
1077 [17750] localedata: wrong collation order of diacritics in most locales
1078 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1080 [17956] build: Build fails on missing definitions from header file
1081 nss/nss.h when Mozilla NSS is used for cryptography
1082 [18203] libc: realpath() does not handle unreachable paths correctly
1083 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1084 [18812] localedata: kab_DZ: new Kabyle Algeria locale
1085 [18822] libc: Internal functions are called via PLT
1086 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1087 [19170] libc: __gmon_start__ defined in hppa in crtn.S
1088 [19574] libc: glibc should support building static PIE binaries
1089 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1091 [19971] glob: glob: Do not skip entries with zero d_ino values
1092 [19982] localedata: fr.po: spelling mistake for error code EXDEV
1093 [20008] localedata: km_KH: convert to translit_neutral
1094 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1095 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1096 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1097 [20482] localedata: de_CH: abbreviated weekdays should be two letters
1098 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
1100 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1101 they're set, wrong errors returned by gaih_inet when lookup functions
1103 [20756] localedata: [PATCH] Use Unicode wise thousands separator
1104 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1106 [20952] localedata: yuw_PG: new locale
1107 [21084] localedata: charmaps/IBM858: new codepage
1108 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1109 [21242] libc: assert gives pedantic warning in old gcc versions
1110 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1111 __regcall calling convention
1112 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1113 [21326] libc: C99 functions are not declared for C++11 and later if
1114 _GNU_SOURCE is not predefined by g++
1115 [21457] libc: sys/ucontext.h namespace
1116 [21530] libc: tmpfile() should be implemented using O_TMPFILE
1117 [21660] math: GCC fails to compile a formula with tgmath.h
1118 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1119 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1120 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1121 [21684] math: tgmath.h handling of complex integers
1122 [21685] math: tgmath.h handling of bit-fields
1123 [21686] math: tgmath.h handling of __int128
1124 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1126 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1128 [21750] localedata: column width of characters incompatible with classical
1130 [21754] malloc: malloc: Perform as little work as possible after heap
1131 consistency check failures
1132 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1133 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1134 [21791] string: Unused XXX_chk_XXX functions in libc.a
1135 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1137 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1139 [21845] localedata: Added new Locale bho_NP
1140 [21853] localedata: Fix abday Which looks same as day in zh_SG
1141 [21854] localedata: Added New Locale en_SC
1142 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1143 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1144 _dl_runtime_resolve_avx_slow
1145 [21885] network: getaddrinfo: gethosts does not release resolver context
1146 on memory allocation failure
1147 [21899] libc: XPG4.2 sigaction namespace
1148 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1150 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1152 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1153 errno value, causing getaddrinfo to fail
1154 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1155 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1156 instead of EAI_NODATA
1157 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1158 constant PTRACE_SEIZE_DEVEL
1159 [21930] math: C-only gcc builtins used in <math.h> isinf
1160 [21932] network: Unpaired __resolv_context_get in generic get*_r
1162 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1163 [21944] libc: sigval namespace
1164 [21951] localedata: Update hanzi collation by stroke
1165 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
1166 sysdeps/x86_64/fpu/e_expf.S
1167 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1168 allocation in syscall loops)
1169 [21959] localedata: Fix Country name for xh_ZA
1170 [21960] localedata: Fix abmon for bem_ZM
1171 [21966] math: AVX2 mathvec functions use FMA without checking
1172 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1173 [21971] localedata: Added New Locale for mfe_MU
1174 [21972] libc: assert macro requires operator== (int) for its argument type
1175 [21973] math: [sparc] libm missing sqrtl compat symbol
1176 [21974] libc: Remove __bb_init_func and __bb_exit_func
1177 [21982] string: stratcliff.c: error: assuming signed overflow does not
1179 [21986] stdio: __guess_grouping is called incorrectly
1180 [21987] math: [sparc32] wrong bits/long-double.h installed
1181 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1183 [22022] localedata: Missing country_name for mni_IN
1184 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1186 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1188 [22026] locale: iconv_open: heap overflow on gconv_init failure
1189 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1190 [22035] math: [m68k] bits/math-inline.h macro namespace
1191 [22038] localedata: Fix abbreviated weeks and months for Somali
1192 [22044] localedata: Remove redundant data for Limburgish Language
1193 [22050] malloc: Linking with -lmcheck does not hook
1194 __malloc_initialize_hook correctly
1195 [22051] libc: zero terminator in the middle of glibc's .eh_frame
1196 [22052] malloc: malloc failed to compile with GCC 7 and -O3
1197 [22070] localedata: charmaps/UTF-8: wcwidth for
1198 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1199 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1200 Jungseong and Jongseong) should be 0
1201 [22078] nss: nss_files performance issue in multi mode
1202 [22082] math: bits/math-finite.h exp10 condition
1203 [22086] libc: pcprofiledump incorrect cross-endian condition
1204 [22093] dynamic-link: ld.so no longer searches in .../x86_64
1205 [22095] network: Name server address allocation memory leak in resolv.conf
1207 [22096] network: __resolv_conf_attach can incorrectly free passed conf
1209 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1210 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1212 [22111] malloc: malloc: per thread cache is not returned when thread exits
1213 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1214 [22134] libc: [linux] implement fexecve with execveat
1215 [22142] libc: [powerpc] printf oupts a wrong value of DBL_MAX on ppc64 and
1217 [22145] libc: ttyname() gives up too early in the face of namespaces
1218 [22146] math: C++ build issue with float128 on x86_64
1219 [22153] nptl: nptl: save error code before process termination
1220 [22156] libc: [hppa,ia64,microblaze] Executable stack default
1221 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1222 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1223 [22165] libc: [hppa] Text relocations in libc.so
1224 [22180] libc: destructor registered via __cxa_atexit is called twice
1225 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1226 symlinks") cause "make" segfaults
1227 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1229 [22207] libc: FAIL: stdlib/test-atexit-race
1230 [22225] math: nearbyint arithmetic moved before feholdexcept
1231 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1232 [22235] math: iscanonical in C++ and float128
1233 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1234 the svid compat wrapper
1235 [22244] math: ynf and yn are wrong without the svid compat wrapper
1236 [22273] libc: Improper assert in Linux posix_spawn implementation
1237 [22284] libc: -pg -pie doesn't work
1238 [22292] locale: localedef exits with error 4 when it should be error 1
1239 [22294] locale: Allow "" for int_currency_symbol definition in locales.
1240 [22295] locale: Don't warn on non-symbolic characters in locale sources in
1242 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1243 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1245 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1246 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1247 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1248 [22322] libc: [mips64] wrong bits/long-double.h installed
1249 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1250 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1252 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1253 [22343] malloc: Integer overflow in posix_memalign
1254 [22347] libc: getrandom() returns the number of bytes that were copied to
1255 the buffer even though the comments say "Return 0 on success and -1 on
1257 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1258 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1260 [22370] dynamic-link: Incorrect note padding check
1261 [22375] libc: malloc returns pointer from tcache_get when should return
1262 NULL (CVE-2017-17426)
1263 [22377] math: iseqsig, float128 and C++
1264 [22382] localedata: Error in tpi_PG locale
1265 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1266 inside the ASCII printable range
1267 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1269 [22403] localedata: Slash needs escaping in some locales
1270 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1271 [22409] network: res_hnok does not accept some host names used on the
1273 [22412] network: res_dnok, res_hnok should perform syntax checks
1274 [22413] network: ns_name_pton ignores syntactically invalid trailing
1276 [22415] stdio: setvbuf can lead to invalid free/segfault
1277 [22432] build: Non-deterministic build
1278 [22439] malloc: malloc_info should compute summary statistics for all sub-
1280 [22442] network: if_nametoindex could report index for the wrong
1281 networking interface
1282 [22446] build: aliasing violation calling readlink in handle_request
1283 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
1284 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
1285 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
1286 __nscd_hash/__nss_hash
1287 [22463] network: p_secstodate overflow handling
1288 [22469] localedata: pl_PL LC_COLLATE does not use i18n
1289 [22478] libc: sigwait can fail with EINTR
1290 [22505] libc: ldconfig processes include directive in locale-specific
1292 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
1293 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
1294 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
1295 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
1296 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
1297 [22534] localedata: Collation rules for Serbian and Bosnian should be the
1298 same as for Croatian
1299 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
1300 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
1301 [22577] libc: missing newline after "cannot allocate TLS data structures
1303 [22588] manual: manual/conf.texi: missing underscore in front of
1305 [22593] math: nextafter and nexttoward are declared with const attribute
1306 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
1307 [22603] string: ia64 memchr overflows internal pointer check
1308 [22605] libc: SH clone does not set the exit code correctly
1309 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
1311 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
1312 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
1313 modified in case of success
1314 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
1315 [22615] manual: manual: ambiguous wording about errno value in case of
1317 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
1319 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
1320 binaries or if /proc is not mounted (CVE-2017-16997)
1321 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
1322 [22630] build: $(no-pie-ldflag) is no longer effective
1323 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
1324 [22635] nptl: pthread_self returns NULL before libpthread is loaded
1325 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
1326 [22637] nptl: guard size is subtracted from thread stack size instead of
1328 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
1329 [22657] localedata: hu_HU: Avoid double space in date
1330 [22660] math: fmax, fmin sNaN handling on alpha
1331 [22664] libc: New warning of GCC8
1332 [22665] math: alpha: ceil and floor raise inexact exceptions
1333 [22666] math: alpha: trunc raise inexact exceptions
1334 [22667] libc: makecontext lacks stack alignment on i386
1335 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
1336 [22679] libc: getcwd(3) can succeed without returning an absolute path
1338 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
1339 elision and tunables
1340 [22687] math: [powerpc-nofpu] complex long double functions spurious
1342 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
1343 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
1344 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
1346 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
1347 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
1349 [22701] nis: Incomplete removal of libnsl
1350 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
1351 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
1352 [22715] dynamic-link: FAIL: elf/tst-audit10
1353 [22719] libc: Backtrace tests fail on hppa
1354 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
1355 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
1356 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
1357 before the first call to crypt_r () in crypt/badsalttest.c
1364 * A per-thread cache has been added to malloc. Access to the cache requires
1365 no locks and therefore significantly accelerates the fast path to allocate
1366 and free small amounts of memory. Refilling an empty cache requires locking
1367 the underlying arena. Performance measurements show significant gains in a
1368 wide variety of user workloads. Workloads were captured using a special
1369 instrumented malloc and analyzed with a malloc simulator. Contributed by
1370 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
1372 * Unicode 10.0.0 Support: Character encoding, character type info, and
1373 transliteration tables are all updated to Unicode 10.0.0, using
1374 generator scripts contributed by Mike FABIAN (Red Hat).
1375 These updates cause user visible changes, especially the changes in
1376 wcwidth for many emoji characters cause problems when emoji sequences
1377 are rendered with pango, see for example:
1378 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
1380 * Collation of Hungarian has been overhauled and is now consistent with "The
1381 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
1384 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
1386 - The GNU C Library will now detect when /etc/resolv.conf has been
1387 modified and reload the changed configuration. The new resolver option
1388 “no-reload” (RES_NORELOAD) disables this behavior.
1390 - The GNU C Library now supports an arbitrary number of search domains
1391 (configured using the “search” directive in /etc/resolv.conf);
1392 previously, there was a hard limit of six domains. For backward
1393 compatibility, applications that directly modify the ‘_res’ global
1394 object are still limited to six search domains.
1396 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
1397 Library will now randomly pick a name server from the configuration as a
1398 starting point. (Previously, the second name server was always used.)
1400 * The tunables feature is now enabled by default. This allows users to tweak
1401 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
1403 * New function reallocarray, which resizes an allocated block (like realloc)
1404 to the product of two sizes, with a guaranteed clean failure upon integer
1405 overflow in the multiplication. Originally from OpenBSD, contributed by
1406 Dennis Wölfing and Rüdiger Sonderfeld.
1408 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
1409 These are extended versions of preadv and pwritev, respectively, taking an
1410 additional flags argument. The set of supported flags depends on the
1411 running kernel; full support currently requires kernel 4.7 or later.
1413 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
1414 create a new session ID for the spawned process. This feature is
1415 scheduled to be added to the next major revision of POSIX; for the time
1416 being, it is available under _GNU_SOURCE.
1418 * errno.h is now safe to use from C-preprocessed assembly language on all
1419 supported operating systems. In this context, it will only define the
1420 Exxxx constants, as preprocessor macros expanding to integer literals.
1422 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
1423 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
1424 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
1425 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
1427 To compile programs that use this feature, the compiler must support
1428 128-bit floating point with the type name _Float128 (as defined by TS
1429 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
1430 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
1431 must be defined to make the new interfaces visible.
1433 The new functions and macros correspond to those present for other
1434 floating-point types (except for a few obsolescent interfaces not
1435 supported for the new type), with F128 or f128 suffixes; for example,
1436 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
1437 printf or scanf formats for the new type; the strfromf128 and strtof128
1438 interfaces should be used instead.
1440 Deprecated and removed features, and other changes affecting compatibility:
1442 * The synchronization that pthread_spin_unlock performs has been changed to
1443 now be equivalent to a C11 atomic store with release memory order to the
1444 spin lock's memory location. Previously, several (but not all)
1445 architectures used stronger synchronization (e.g., containing what is
1446 often called a full barrier). This change can improve performance, but
1447 may affect odd fringe uses of spin locks that depend on the previous
1448 behavior (e.g., using spin locks as atomic variables to try to implement
1449 Dekker's mutual exclusion algorithm).
1451 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
1454 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
1455 will only be built and installed when the GNU C Library is configured with
1456 --enable-obsolete-rpc. This allows alternative RPC implementations, such
1457 as TIRPC or rpcsvc-proto, to be used.
1459 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
1460 libnss_compat, are deprecated, and will not be built or installed by
1463 The NIS(+) support library, libnsl, is also deprecated. By default, a
1464 compatibility shared library will be built and installed, but not headers
1465 or development libraries. Only a few NIS-related programs require this
1466 library. (In particular, the GNU C Library has never required programs
1467 that use 'gethostbyname' to be linked with libnsl.)
1469 Replacement implementations based on TIRPC, which additionally support
1470 IPv6, are available from <https://github.com/thkukuk/>. The configure
1471 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
1472 name service modules, to be built and installed.
1474 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
1475 support is enabled, the configured recursive resolver must support EDNS.
1476 (Responding to EDNS-enabled queries with responses which are not
1477 EDNS-enabled is fine, but FORMERR responses are not.)
1479 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
1480 servers have not supported this opcode for a long time.
1482 * The _res_opcodes variable has been removed from libresolv. It had been
1483 exported by accident.
1485 * <string.h> no longer includes inline versions of any string functions,
1486 as this kind of optimization is better done by the compiler. The macros
1487 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
1489 * The nonstandard header <xlocale.h> has been removed. Most programs should
1490 use <locale.h> instead. If you have a specific need for the definition of
1491 locale_t with no other declarations, please contact
1492 libc-alpha@sourceware.org and explain.
1494 * The obsolete header <sys/ultrasound.h> has been removed.
1496 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
1498 * The obsolete function cfree has been removed. Applications should use
1501 * The stack_t type no longer has the name struct sigaltstack. This changes
1502 the C++ name mangling for interfaces involving this type.
1504 * The ucontext_t type no longer has the name struct ucontext. This changes
1505 the C++ name mangling for interfaces involving this type.
1507 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
1508 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
1509 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
1510 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
1511 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
1512 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
1513 fpregset_t type no longer has the name struct fpu. This changes the C++
1514 name mangling for interfaces involving those types.
1516 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
1517 synced with the kernel:
1519 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
1520 are not supported on this architecture and have been removed.
1522 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
1523 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
1524 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
1526 Programs that assume the GET/SETREGS ptrace requests are universally
1527 available will now fail to build, instead of malfunctioning at runtime.
1529 Changes to build and runtime requirements:
1531 * Linux kernel 3.2 or later is required at runtime, on all architectures
1532 supported by that kernel. (This is a change from version 2.25 only for
1535 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
1537 * On most architectures, GCC 4.9 or later is required to build the GNU C
1538 Library. On powerpc64le, GCC 6.2 or later is required.
1540 Older GCC versions and non-GNU compilers are still supported when
1541 compiling programs that use the GNU C Library. (We do not know exactly
1542 how old, and some GNU extensions to C may be _de facto_ required. If you
1543 are interested in helping us make this statement less vague, please
1544 contact libc-alpha@sourceware.org.)
1546 Security related changes:
1548 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
1549 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
1551 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
1552 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
1554 * Avoid printing a backtrace from the __stack_chk_fail function since it is
1555 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
1558 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
1559 fixed (CVE-2017-12133).
1561 The following bugs are resolved with this release:
1563 [984] network: Respond to changed resolv.conf in gethostbyname
1564 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
1565 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
1567 [12189] libc: __stack_chk_fail should not attempt a backtrace
1569 [14096] time: Race condition on timezone/tst-timezone.out
1570 [14172] localedata: az_IR: new locale
1571 [14995] build: glibc fails to build if gold is the default linker, even if
1573 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
1574 [16637] network: inet_pton function is accepting IPv6 with bad format
1575 [16640] string: string/strtok.c: undefined behaviour inconsistent between
1576 x86 and other generic code
1577 [16875] localedata: ko_KR: fix lang_name
1578 [17225] localedata: ar_SY: localized month names for May and June are
1580 [17297] localedata: da_DK: wrong date_fmt string
1581 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
1582 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
1583 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
1584 [19066] localedata: ar_SA abbreviated day and month names are in English
1585 [19569] network: resolv: Support an arbitrary number of search domains
1586 [19570] network: Implement random DNS server selection in the stub
1588 [19838] locale: localedef fails on PA-RISC
1589 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
1590 order of 0D36 and 0D37
1591 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
1593 [20098] libc: FAIL: debug/backtrace-tst on hppa
1594 [20257] network: sunrpc: clntudp_call does not enforce timeout when
1596 [20275] localedata: locale day/abday/mon/abmon should not have trailing
1598 [20313] localedata: Update locale data to Unicode 9.0
1599 [20424] manual: Document how to provide a malloc replacement
1600 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
1602 [20686] locale: Add el_GR@euro to SUPPORTED.
1603 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
1604 failures consistently
1605 [21015] dynamic-link: Document and fix --enable-bind-now
1606 [21016] nptl: pthread_cond support is broken on hppa
1607 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
1608 frame-pointer on i386
1609 [21049] libc: segfault in longjmp_chk() due to clobbered processor
1611 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
1612 [21088] libc: Build fails with --enable-static-nss
1613 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
1614 generic c code is used
1615 [21109] libc: Tunables broken on big-endian
1616 [21112] math: powf has large ulp errors with base close to 1 and exponent
1618 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
1620 [21120] malloc: glibc malloc is incompatible with GCC 7
1621 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
1623 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
1624 (-0.0) when linking with -lieee
1625 [21171] math: log10, log2 and lgamma return incorrect results
1626 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
1627 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
1628 [21207] localedata: ce_RU: update weekdays from CLDR
1629 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
1630 [21217] localedata: Update months from CLDR-31
1631 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
1632 [21243] libc: support_delete_temp_file should issue warning for failed
1634 [21244] libc: support resolv_test_start() socket fd close should be
1636 [21253] libc: localedef randomly segfaults when using -fstack-check due to
1637 new posix_spawn implementation
1638 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
1639 leads to lower CPU frequency
1640 [21259] libc: [alpha] termios.h missing IXANY for POSIX
1641 [21261] libc: [sparc64] bits/setjmp.h namespace
1642 [21267] network: [mips] bits/socket.h IOC* namespace
1643 [21268] libc: [alpha] termios.h NL2, NL3 namespace
1644 [21270] libc: mmap64 silently truncates large offset values
1645 [21275] libc: posix_spawn always crashes on ia64 now
1646 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
1647 [21280] math: [powerpc] logbl for POWER7 return incorrect results
1648 [21289] libc: Incorrect declaration for 32-bit platforms with
1649 _FILE_OFFSET_BITS=64 causes build error
1650 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
1651 not support gethostbyname4_r
1652 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
1654 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
1656 [21340] libc: Support POSIX_SPAWN_SETSID
1657 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
1658 [21359] network: ns_name_pack needs additional byte in destination buffer
1659 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
1660 against fragmentation attacks (CVE-2017-12132)
1661 [21369] network: resolv: Remove EDNS fallback
1662 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
1664 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
1665 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
1666 [21393] stdio: Missing dup3 error check in freopen, freopen64
1667 [21396] libc: Use AVX2 memcpy/memset on Skylake server
1668 [21399] localedata: Bad description for U00EC in
1669 localedata/charmaps/CP1254
1670 [21411] malloc: realloc documentation error
1671 [21426] network: sys/socket.h uio.h namespace
1672 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
1673 [21445] libc: signal.h bsd_signal namespace
1674 [21455] network: Network headers stdint.h namespace
1675 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
1677 [21475] network: resolv: Overlong search path is truncated mid-label
1678 [21511] libc: sigstack namespace
1679 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
1680 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
1681 bits/syscall.h: No such file or directory
1682 [21517] libc: struct sigaltstack namespace
1683 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
1684 [21533] localedata: Update locale data to Unicode 10.0
1686 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
1687 junk at end of line, first unrecognized character is `@'
1688 [21538] libc: SIG_HOLD missing for XPG4
1689 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
1690 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
1691 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
1692 [21543] libc: sigevent namespace
1693 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
1694 size for general purpose registers in mcontext_t structure
1695 [21550] libc: sigwait namespace
1696 [21552] libc: XPG4 bsd_signal namespace
1697 [21554] libc: sigpause namespace
1698 [21560] libc: sys/wait.h signal.h namespace
1699 [21561] libc: waitid namespace
1700 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
1701 '/usr/include/stdlib.h': Permission denied
1702 [21575] libc: sys/wait.h missing struct rusage definition
1703 [21584] libc: sigaltstack etc namespace
1704 [21597] libc: siginterrupt namespace
1705 [21607] math: hppa: FAIL: math/test-tgmath
1706 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
1708 [21622] libc: [tile] missing SA_* for POSIX.1:2008
1709 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
1710 stack and heap (CVE-2017-1000366)
1711 [21625] libc: wait3 namespace
1712 [21654] nss: Incorrect pointer alignment in NSS group merge result
1714 [21657] network: Parse interface zone id for node-local multicast
1715 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
1717 [21666] libc: .symver is used on common symbol
1718 [21668] network: resolv: res_init cross-thread broadcast introduces race
1720 [21687] math: tgmath.h totalorder, totalordermag return type
1721 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
1723 [21696] libc: Incorrect assumption of of __cpu_mask in
1724 posix/sched_cpucount.c
1725 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
1726 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
1728 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
1729 leading to relocation crash
1730 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
1731 `resolv_conf_matches (resp, conf)' failed.
1732 [21710] localedata: Added Samoan language locale for Samoa
1733 [21711] localedata: Pashto yesstr/nostr locale are missing
1734 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
1735 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
1736 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
1737 [21723] localedata: yesstr/nostr missing for Chinese language locale
1738 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
1740 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
1742 [21728] localedata: New Locale for Tongan language
1743 [21729] localedata: incorrect LC_NAME fields for hi_IN
1744 [21733] localedata: yesstr and nostr are missing for zh_HK
1745 [21734] localedata: Missing yesstr and nostr are for kw_GB
1746 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
1747 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
1748 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
1749 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
1751 [21744] libc: Tests failing on --enable-tunables --enable-stack-
1753 [21749] localedata: Wrong abbreviated day name (“abday”) for
1755 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
1756 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
1757 [21759] localedata: missing yesstr and nostr for Tigrinya
1758 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
1759 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
1760 [21767] localedata: Missing Bislama locales
1761 [21768] localedata: Missing yesstr and nostr for aa_ET
1762 [21770] localedata: Missing Field in li_NL
1763 [21778] nptl: Robust mutex may deadlock
1764 [21779] libc: MicroBlaze segfaults when loading libpthread
1765 [21783] localedata: Fix int_select international_call_prefixes
1766 [21784] localedata: Inconsistency in country_isbn
1767 [21788] localedata: Missing Country Postal Abbreviations
1768 [21794] localedata: Added-country_isbn-for-Italy
1769 [21795] localedata: Add/Fix country_isbn for France
1770 [21796] localedata: Added country_isbn for Republic of Korea
1771 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
1772 [21799] localedata: Added int_select international_call_prefixes
1773 [21801] localedata: Added int_select international_call_prefixes
1774 [21804] nptl: Double semicolon in thread-shared-types.h
1775 [21807] localedata: LC_ADDRESS fix for pap_CW
1776 [21808] localedata: Fix LC_ADDRESS for pap_AW
1777 [21821] localedata: Added country_name in mai_IN
1778 [21822] localedata: Fix LC_TIME for mai_IN
1779 [21823] localedata: missing yesstr, nostr for sa_IN
1780 [21825] localedata: Fix name_mrs for mag_IN
1781 [21828] localedata: 2.26 changelog should mention user visible changes
1783 [21835] localedata: Added Maithili language locale for Nepal
1784 [21838] localedata: Removed redundant data for the_NP
1785 [21839] localedata: Fix LC_MONETARY for ta_LK
1786 [21844] localedata: Fix Latin characters and Months Sequence.
1787 [21848] localedata: Fix mai_NP Title Name
1792 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
1793 24731-2:2010, is supported to enable declarations of functions from that
1794 TR. Note that not all functions from that TR are supported by the GNU C
1797 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
1798 18661-1:2014, is supported to enable declarations of functions and macros
1799 from that TS. Note that not all features from that TS are supported by
1802 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
1803 18661-4:2015, is supported to enable declarations of functions and macros
1804 from that TS. Note that most features from that TS are not supported by
1807 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
1808 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
1809 Since the GNU C Library defaults to a much newer revision of POSIX, this
1810 will only affect programs that specifically request an old conformance
1811 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
1812 see a change in the visible declarations, but a program compiled with
1813 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
1816 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
1817 defined by all multithreaded code, but glibc has not required this for
1820 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
1821 means that in a future release, the macros “major”, “minor”, and “makedev”
1822 will only be available from <sys/sysmacros.h>.
1824 These macros are not part of POSIX nor XSI, and their names frequently
1825 collide with user code; see for instance glibc bug 19239 and Red Hat bug
1826 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
1827 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
1830 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
1831 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
1832 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
1834 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
1835 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
1836 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
1837 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
1838 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
1839 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
1840 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
1841 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
1842 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
1843 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
1844 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
1847 * New <math.h> features are added from TS 18661-1:2014:
1849 - Signaling NaN macros: SNANF, SNAN, SNANL.
1851 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
1852 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
1853 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
1855 - llogb functions: the llogb, llogbf and llogbl functions, and the
1856 FP_LLOGB0 and FP_LLOGBNAN macros.
1858 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
1861 - Comparison macros: iseqsig.
1863 - Classification macros: iscanonical, issubnormal, iszero.
1865 - Total order functions: totalorder, totalorderf, totalorderl,
1866 totalordermag, totalordermagf, totalordermagl.
1868 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
1870 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
1871 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
1873 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
1874 are added to libc. They convert a floating-point number into string.
1876 * Most of glibc can now be built with the stack smashing protector enabled.
1877 It is recommended to build glibc with --enable-stack-protector=strong.
1878 Implemented by Nick Alcock (Oracle).
1880 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
1881 intended to be used instead of memset() to erase sensitive data after use;
1882 the compiler will not optimize out calls to explicit_bzero even if they
1883 are "unnecessary" (in the sense that no _correct_ program can observe the
1884 effects of the memory clear).
1886 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
1887 to float instead of double. This does not affect the ABI of any libraries
1888 that are part of the GNU C Library, but may affect the ABI of other
1889 libraries that use this type in their interfaces.
1891 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
1892 float_t and double_t types are now defined to long double instead of float
1893 and double. These options are not the default, and this does not affect
1894 the ABI of any libraries that are part of the GNU C Library, but it may
1895 affect the ABI of other libraries that use this type in their interfaces,
1896 if they are compiled or used with those options.
1898 * The getentropy and getrandom functions, and the <sys/random.h> header file
1901 * The buffer size for byte-oriented stdio streams is now limited to 8192
1902 bytes by default. Previously, on Linux, the default buffer size on most
1903 file systems was 4096 bytes (and thus remains unchanged), except on
1904 network file systems, where the buffer size was unpredictable and could be
1905 as large as several megabytes.
1907 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
1908 for the Linux quota interface which predates kernel version 2.4.22 has
1911 * The malloc_get_state and malloc_set_state functions have been removed.
1912 Already-existing binaries that dynamically link to these functions will
1913 get a hidden implementation in which malloc_get_state is a stub. As far
1914 as we know, these functions are used only by GNU Emacs and this change
1915 will not adversely affect already-built Emacs executables. Any undumped
1916 Emacs executables, which normally exist only during an Emacs build, should
1917 be rebuilt by re-running “./configure; make” in the Emacs build tree.
1919 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
1920 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
1921 “no-ip6-dotint” had already been the default, and support for the
1922 “ip6-dotint” option was removed from the Internet in 2006.
1924 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
1925 flag from <resolv.h> have been removed. The option relied on a
1926 backwards-incompatible DNS extension which was never deployed on the
1929 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
1930 RES_BLAST defined in the <resolv.h> header file have been deprecated.
1931 They were already unimplemented.
1933 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
1934 _res.flags are deprecated. The flag was standardized in RFC 2133, but
1935 removed again from the IETF name lookup interface specification in RFC
1936 2553. Applications should use getaddrinfo instead.
1938 * DNSSEC-related declarations and definitions have been removed from the
1939 <arpa/nameser.h> header file, and libresolv will no longer attempt to
1940 decode the data part of DNSSEC record types. Previous versions of glibc
1941 only implemented minimal support for the previous version of DNSSEC, which
1942 is incompatible with the currently deployed version.
1944 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
1945 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
1946 <arpa/nameser.h> header file because the distinction between RR types and
1947 meta-RR types is not officially standardized, subject to revision, and
1948 thus not suitable for encoding in a macro.
1950 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
1951 and rhook members of the res_state type in <resolv.h> have been removed.
1952 The glibc stub resolver did not support these hooks, but the header file
1953 did not reflect that.
1955 * For multi-arch support it is recommended to use a GCC which has
1956 been built with support for GNU indirect functions. This ensures
1957 that correct debugging information is generated for functions
1958 selected by IFUNC resolvers. This support can either be enabled by
1959 configuring GCC with '--enable-gnu-indirect-function', or by
1960 enabling it by default by setting 'default_gnu_indirect_function'
1961 variable for a particular architecture in the GCC source file
1964 * GDB pretty printers have been added for mutex and condition variable
1965 structures in POSIX Threads. When installed and loaded in gdb these pretty
1966 printers show various pthread variables in human-readable form when read
1967 using the 'print' or 'display' commands in gdb.
1969 * Tunables feature added to allow tweaking of the runtime for an application
1970 program. This feature can be enabled with the '--enable-tunables' configure
1971 flag. The GNU C Library manual has details on usage and README.tunables has
1972 instructions on adding new tunables to the library.
1974 * A new version of condition variables functions have been implemented in
1975 the NPTL implementation of POSIX Threads to provide stronger ordering
1978 * A new version of pthread_rwlock functions have been implemented to use a more
1979 scalable algorithm primarily through not using a critical section anymore to
1982 Security related changes:
1984 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
1985 have been created with makecontext could fail to terminate due to a
1986 missing .cantunwind annotation. This has been observed to lead to a hang
1987 (denial of service) in some Go applications compiled with gccgo. Reported
1988 by Andreas Schwab. (CVE-2016-6323)
1990 * The DNS stub resolver functions would crash due to a NULL pointer
1991 dereference when processing a query with a valid DNS question type which
1992 was used internally in the implementation. The stub resolver now uses a
1993 question type which is outside the range of valid question type values.
1996 The following bugs are resolved with this release:
1998 [4099] stdio: Overly agressive caching by stream i/o functions.
1999 [7065] build: Support building glibc with -fstack-protector or -fstack-
2001 [9842] localedata: en_CA: incorrect date format
2002 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
2003 before it started waiting
2004 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
2005 [15765] nptl: sem_open is wrongly a cancellation point
2006 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
2007 [16458] libc: endian.h and netinet/in.h byte order macros return values of
2009 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
2010 library linked with pthread
2011 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
2012 "FIXME: Ingo" issue)
2013 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
2014 [17252] libc: getrandom and getentropy syscall
2015 [17730] malloc: thread-local storage is sometimes improperly free()'d
2016 after being __libc_memalign()'d
2017 [18241] stdio: failed fseek on memstream does not set errno and can fail
2019 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
2021 [18463] nptl: pthread_cond_broadcast issue when surrounded by
2022 PTHREAD_PRIO_INHERIT mutex on ARM
2023 [18784] network: res_query and related function crash for special record
2024 type queries (CVE-2015-5180)
2025 [19380] math: strtod does not raise "inexact"
2026 [19387] string: Integer overflow in memchr
2027 [19390] string: Integer overflow in strncat
2028 [19398] build: linknamespace tests fail with massively parallel build
2029 [19402] nptl: Deadlock with robust shared mutex and asynchronous
2031 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
2032 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
2033 [19514] libc: [PATCH] Fix spelling errors in spelling
2034 "implement"/"implementation" in several places
2035 [19582] network: Deprecate RES_USE_INET6
2036 [19673] manual: clog10 docs appear to be erroneous
2037 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2038 causes a segmentation fault
2039 [19826] libc: invalid pointer returned from __tls_get_addr with static
2041 [20016] network: resolv: Remove hooks support from the API
2042 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2044 [20033] math: [x86_64] vectorized math function don't call the __finite
2046 [20116] nptl: use after free in pthread_create
2047 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2048 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2050 [20311] nptl: please install proc_service.h
2051 [20366] libc: Compilation errors in installed headers in strict-compliance
2053 [20370] malloc: malloc: Arena free list management is still racy
2054 (incorrect fix in bug 19243)
2055 [20386] libc: assert (X = 0) does not result in GCC warning
2056 [20432] malloc: malloc: Minimize interface required for interposition
2057 [20435] libc: Missing unwind info in __startcontext causes infinite loop
2058 in _Unwind_Backtrace (CVE-2016-6323)
2059 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2060 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2062 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2063 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2064 [20477] network: resolv: incorrect double-checked locking related to
2066 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2068 [20495] math: x86_64 performance degradation due to AVX/SSE transition
2070 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2071 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2072 cause transition penalty
2073 [20517] math: sparcv9 missing fdiml compat symbol
2074 [20524] manual: strverscmp is inconsistent
2075 [20525] libc: <sys/quota.h> should be based on kernel headers
2076 [20539] math: GCC 7 -static -lm fails to link at -O3
2077 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2079 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2081 [20591] network: Remove obsolete DNSSEC support
2082 [20592] network: DNS resource record type classification macros in
2083 <arpa/nameser.h> are incorrect
2084 [20593] network: Update DNS RR type definitions
2085 [20611] network: getaddrinfo accepts invalid numeric scope IDs
2086 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2088 [20629] network: libresolv: Remove support for bitstring labels
2090 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2091 assertion: "maxidx >= 2"
2092 [20660] math: [arm] Use VSQRT
2093 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2094 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2095 [20689] libc: Test for FMA should also check for AVX.
2096 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2097 [20715] math: iszero macro breaks existing code
2098 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2099 [20728] libc: powerpc: Missing TOC stub in clone
2100 [20729] build: glibc-2.24 fails to build for i486 with -Os
2101 [20750] build: Build fails with default PIE enabled gcc-6.x
2102 [20768] math: [alpha] sqrt fegetenv namespace
2103 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2105 [20787] math: float_t is defined as float incorrectly on x86_64 even if
2106 __FLT_EVAL_METHOD__ is 2
2107 [20790] network: rpcgen buffer overrun in get_prog_declaration
2108 [20822] nptl: race condition in __lll_unlock_elision on powerpc
2109 [20829] libc: crypt snprintf namespace
2110 [20847] libc: tst-vfork3 failure
2111 [20855] math: Default bits/mathdef.h has inappropriate float_t
2112 [20859] math: [sh4] FP_ILOGB0 invalid
2113 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2114 U+20AC), not same as GBK
2115 [20915] dynamic-link: global-dynamic TLS broken on aarch64
2116 [20916] math: pow handling of sNaN arguments
2117 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2118 [20919] math: Bad pow (qNaN, 0) result with -lieee
2119 [20940] math: hypot sNaN handling
2120 [20947] math: fmax, fmin sNaN handling
2121 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2122 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2124 [20971] string: powerpc64/power7 memchr overflows internal pointer check
2125 [20973] nptl: robust mutexes: Lost wake-ups
2126 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2127 [20978] nis: strlen on null pointer in nss_nisplus
2128 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2130 [21014] string: i686 memchr overflows internal pointer check
2131 [21019] libc: [mips] n32 lseek incorrect on overflow
2132 [21022] libc: [microblaze] __backtrace get_frame_size namespace
2133 [21026] libc: [MIPS] readahead syscall is broken on n64
2134 [21028] math: Fallback fesetexceptflag should always succeed
2135 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2136 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2138 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2139 [21061] librt: [microblaze] librt lost clock_* exports
2140 [21073] libc: tunables: insecure environment variables passed to
2141 subprocesses with AT_SECURE
2142 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2146 * The minimum Linux kernel version that this version of the GNU C Library
2147 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2148 kernel version 2.6.32 or later suffices (on architectures that already
2149 required kernel versions more recent than 3.2, those requirements remain
2150 unchanged). Linux 3.2 or later kernel headers are required on all
2153 * The pap_AN locale has been deleted. This has been deprecated for a long
2154 time. It has been replaced by pap_AW & pap_CW, both of which have long
2155 been included in previous releases.
2157 * The readdir_r and readdir64_r functions have been deprecated. It is
2158 recommended to use readdir and readdir64 instead.
2160 * The type “union wait” has been removed. It was deprecated in the early
2161 1990s and never part of POSIX. Application code should use the int type
2162 instead of “union wait”.
2164 * A new NSS action is added to facilitate large distributed system
2165 administration. The action, MERGE, allows remote user stores like LDAP
2166 to be merged into local user stores like /etc/groups in order to provide
2167 easy to use, updated, and managed sets of merged credentials. The new
2168 action can be used by configuring it in /etc/nsswitch.conf:
2169 group: files [SUCCESS=merge] nis
2170 Implemented by Stephen Gallagher (Red Hat).
2172 * The deprecated __malloc_initialize_hook variable has been removed from the
2175 * The long unused localedef --old-style option has been removed. It hasn't
2176 done anything in over 16 years. Scripts using this option can safely
2179 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2180 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
2181 return the next representable value in the direction of positive infinity
2182 and the nextdown functions return the next representable value in the
2183 direction of negative infinity. These are currently enabled as GNU
2186 Security related changes:
2188 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
2189 could result in a stack overflow when getnetbyname was called with an
2190 overly long name. (CVE-2016-3075)
2192 * Previously, getaddrinfo copied large amounts of address data to the stack,
2193 even after the fix for CVE-2013-4458 has been applied, potentially
2194 resulting in a stack overflow. getaddrinfo now uses a heap allocation
2195 instead. Reported by Michael Petlan. (CVE-2016-3706)
2197 * The glob function suffered from a stack-based buffer overflow when it was
2198 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2199 Reported by Alexander Cherepanov. (CVE-2016-1234)
2201 * The Sun RPC UDP client could exhaust all available stack space when
2202 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
2203 alloca plugin for GCC. (CVE-2016-4429)
2205 * The IPv6 name server management code in libresolv could result in a memory
2206 leak for each thread which is created, performs a failing naming lookup,
2207 and exits. Over time, this could result in a denial of service due to
2208 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
2210 The following bugs are resolved with this release:
2212 [1170] localedata: ne_NP: update Nepali locale definition file
2213 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2215 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2216 [6796] math: fdim() does not set errno on overflow
2217 [10354] libc: posix_spawn should use vfork() in more cases than presently
2218 [11213] localedata: localedata: add copyright disclaimer to locale files
2219 [12143] localedata: chr_US: new Cherokee locale
2220 [12450] localedata: sgs_LT: new locale
2221 [12676] localedata: ln_CD: new locale
2222 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2224 [13304] math: fma, fmaf, fmal produce wrong results
2225 [14259] build: --localedir arg to configure is ignored
2226 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2227 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2228 [14934] localedata: es_CL: wrong first weekday chilean locale
2229 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2231 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2233 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2234 [15368] nptl: raise() is not async-signal-safe
2235 [15479] math: ceil, floor, round and trunc raise inexact exception
2236 [15578] localedata: kk_KZ: various updates
2237 [16003] localedata: pap_AN: punt old locale
2238 [16137] localedata: iw_IL: punt old locale
2239 [16190] localedata: eo: new esperanto locale
2240 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2241 [16742] malloc: race condition: pthread_atfork() called before first
2242 malloc() results in unexpected locking behaviour/deadlocks
2243 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2245 [16983] localedata: postal_fmt does not allow %l and %n modifiers
2246 [17565] localedata: pt_PT: wrong (work-)week start
2247 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2248 [17950] build: Build fails with -msse
2249 [18205] localedata: be_BY*: wrong first_weekday and first_workday
2250 [18433] libc: posix_spawn does not return correctly upon failure to
2252 [18453] localedata: charmaps/IBM875: incorrect codes
2253 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2255 [18896] localedata: he_IL: improvements for currency
2256 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2257 Romanian locale data
2258 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2260 [19056] libc: Deprecate readdir_r
2261 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2263 [19198] localedata: nl_NL: small improvements for Dutch locales
2264 [19257] network: Per-thread memory leak in __res_vinit with IPv6
2265 nameservers (CVE-2016-5417)
2266 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2268 [19400] locale: Language missing in "iso-639.def", trivial fix in
2270 [19431] malloc: Deadlock between fflush, getdelim, and fork
2271 [19505] libc: Incorrect file descriptor validity checks in
2272 posix_spawn_file_actions_add{open,close,dup2}
2273 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2274 when using RTLD_NEXT
2275 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2276 `intl/{gettextP,loadinfo}.h'
2277 [19534] libc: execle, execlp may use malloc
2278 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
2279 [19573] network: res_nclose and __res_maybe_init disagree about name
2280 server initialization, breaking Hesiod
2281 [19575] localedata: Status of GB18030 tables
2282 [19581] localedata: sr_* date_fmt string contains additional newline
2283 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
2285 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
2286 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
2287 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
2288 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
2290 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
2292 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
2294 [19610] dynamic-link: ldconfig -X removes stale symbolic links
2295 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
2296 [19633] locale: strfmon_l applies global locale to number formatting
2297 [19642] network: Memory leak in getnameinfo
2298 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
2299 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
2301 [19654] math: [x86_64] Need testcase for BZ #19590 fix
2302 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
2304 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
2305 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
2307 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
2309 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
2311 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
2312 pointers and lengths in error-case.
2313 [19727] locale: Converting from/to UTF-xx with iconv() does not always
2314 report errors on UTF-16 surrogates values.
2315 [19755] nscd: nscd assertion failure in gc
2316 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
2317 [19759] libc: mempcpy shouldn't be inlined
2318 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
2319 [19765] libc: s390 needs an optimized mempcpy
2320 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
2321 NAME_MAX limit assumption (CVE-2016-1234)
2322 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
2323 [19787] network: Missing and incorrect truncation checks in getnameinfo
2324 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
2326 [19791] network: Assertion failure in res_query.c with un-connectable name
2328 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
2329 [19822] math: libm.so install clobbers old version
2330 [19825] network: resolv: send_vc can return uninitialized data in second
2331 response to getaddrinfo
2332 [19830] network: nss_dns: should check RDATA length against buffer length
2333 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
2334 confronted with A/AAAA records of invalid size
2335 [19837] nss: nss_db: No retries for some long lines with a larger buffer
2336 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
2337 [19853] stdio: Printing IBM long double in decimal with high precision is
2339 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
2340 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
2341 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
2343 [19865] network: Assertion failure or memory leak in
2344 _nss_dns_getcanonname_r
2345 [19868] network: nss_dns: netent code does not skip over non-PTR records
2346 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
2348 [19881] string: Improve x86-64 memset
2349 [19907] string: Incorrect memcpy tests
2350 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
2352 [19925] libc: termios.h XCASE namespace
2353 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
2354 [19929] libc: limits.h NL_NMAX namespace
2355 [19931] stdio: Memory leak in vfprintf
2356 [19957] libc: clone(CLONE_VM) access invalid parent memory
2357 [19963] localedata: en_IL: New locale
2358 [19989] stdio: stdio.h cuserid namespace
2359 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
2361 [19996] locale: langinfo.h nl_langinfo_l namespace
2362 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
2363 [20010] network: getaddrinfo: Stack overflow in hostent translation
2365 [20012] stdio: libio: fmemopen append mode failure
2366 [20014] stdio: stdio.h namespace for pre-threads POSIX
2367 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
2368 [20023] libc: fcntl.h timespec namespace
2369 [20024] math: [x86_64] vectorized sincos trashes the stack
2370 [20031] network: nss_hesiod: Heap overflow in get_txt_records
2371 [20041] time: sys/time.h timespec namespace
2372 [20043] libc: unistd.h missing cuserid for UNIX98 and before
2373 [20044] libc: unistd.h missing pthread_atfork for UNIX98
2374 [20051] libc: ttyslot in wrong header under wrong conditions
2375 [20054] libc: gethostname not declared for XPG4
2376 [20055] libc: termios.h missing tcgetsid for XPG4
2377 [20072] dynamic-link: x86 init_cpu_features is called twice in static
2379 [20073] libc: sys/stat.h fchmod namespace
2380 [20074] libc: stdlib.h rand_r namespace
2381 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
2382 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
2384 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
2385 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
2387 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
2388 [20119] libc: Wrong mask for processors level type from CPUID
2389 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
2390 AS not supporting AVX512
2391 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
2393 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
2394 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
2396 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
2397 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
2398 [20178] libc: posix_spawn{p} should not call exit
2399 [20191] stdio: libio: vtables hardening
2400 [20195] string: FMA4 detection requires CPUID execution with register
2402 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
2403 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
2405 [20212] math: acos (sNaN) returns sNaN
2406 [20213] math: asin (sNaN) returns sNaN
2407 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
2408 [20218] math: [i386] asinhl (sNaN) returns sNaN
2409 [20219] math: [i386] atanhl (sNaN) returns sNaN
2410 [20222] stdio: fopencookie: Mangle function pointers
2411 [20224] math: [i386] cbrtl (sNaN) returns sNaN
2412 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
2413 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
2415 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
2416 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
2417 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
2418 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
2419 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
2420 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
2421 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
2422 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
2423 [20240] math: modf (sNaN) returns sNaN
2424 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
2425 [20250] math: frexp (sNaN) returns sNaN
2426 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
2427 [20255] math: [i386] fdim, fdimf return with excess range and precision /
2429 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
2430 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
2431 subscript is below array bounds [-Werror=array-bounds]
2432 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
2433 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
2435 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
2436 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
2438 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
2439 "invalid" exceptions
2440 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
2441 [20316] localedata: id_ID: Februari instead of Pebruari
2442 [20327] string: POWER8 strcasecmp returns incorrect result
2443 [20347] math: Failure: Test: j0_downward (0xap+0)
2444 [20348] libc: FAIL: misc/tst-preadvwritev64
2445 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
2446 [20350] libc: There is no test for p{read,write}64
2447 [20357] math: Incorrect cos result for 1.5174239687223976
2448 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
2452 * Unicode 8.0.0 Support: Character encoding, character type info, and
2453 transliteration tables are all updated to Unicode 8.0.0, using new
2454 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
2455 These updates cause user visible changes, such as the fixes for bugs
2456 89, 16061, and 18568.
2458 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
2459 kernel-internal CPU set size. This means that requests that change the
2460 CPU affinity which failed before (for example, an all-ones CPU mask) will
2461 now succeed. Applications that need to determine the effective CPU
2462 affinities need to call sched_getaffinity or pthread_getaffinity_np after
2463 setting it because the kernel can adjust it (and the previous size check
2464 would not detect this in the majority of cases).
2466 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
2467 the following new symbols are used: fts64_children, fts64_close,
2468 fts64_open, fts64_read and fts64_set.
2470 * getaddrinfo now detects certain invalid responses on an internal netlink
2471 socket. If such responses are received, an affected process will
2472 terminate with an error message of "Unexpected error <number> on netlink
2473 descriptor <number>" or "Unexpected netlink response of size <number> on
2474 descriptor <number>". The most likely cause for these errors is a
2475 multi-threaded application which erroneously closes and reuses the netlink
2476 file descriptor while it is used by getaddrinfo.
2478 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
2479 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
2480 unnecessary serialization of memory allocation requests across threads.
2481 The defect is now corrected. Users should see a substantial increase in
2482 the concurent throughput of allocation requests for applications which
2483 trigger this bug. Affected applications typically create and
2484 destroy threads frequently. (Bug 19048 was reported and analyzed by
2487 * There is now a --disable-timezone-tools configure option for disabling the
2488 building and installing of the timezone related utilities (zic, zdump, and
2489 tzselect). This is useful for people who build the timezone data and code
2490 independent of the GNU C Library.
2492 * The obsolete header <regexp.h> has been removed. Programs that require
2493 this header must be updated to use <regex.h> instead.
2495 * The obsolete functions bdflush, create_module, get_kernel_syms,
2496 query_module and uselib are no longer available to newly linked binaries;
2497 the header <sys/kdaemon.h> has been removed. These functions and header
2498 were specific to systems using the Linux kernel and could not usefully be
2499 used with the GNU C Library on systems with version 2.6 or later of the
2502 * Optimized string, wcsmbs and memory functions for IBM z13.
2503 Implemented by Stefan Liebler.
2505 * Newly linked programs that define a variable called signgam will no longer
2506 have it set by the lgamma, lgammaf and lgammal functions. Programs that
2507 require signgam to be set by those functions must ensure that they use the
2508 variable provided by the GNU C Library and declared in <math.h>, without
2509 defining their own copy.
2511 * The minimum GCC version that can be used to build this version of the GNU
2512 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
2513 still be used to compile programs using the GNU C Library.
2515 Security related changes:
2517 * An out-of-bounds value in a broken-out struct tm argument to strftime no
2518 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
2520 * The LD_POINTER_GUARD environment variable can no longer be used to disable
2521 the pointer guard feature. It is always enabled. Previously,
2522 LD_POINTER_GUARD could be used to disable security hardening in binaries
2523 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
2526 * An integer overflow in hcreate and hcreate_r could lead to an
2527 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
2529 * The catopen function no longer has unbounded stack usage. Reported by
2530 Max. (CVE-2015-8779)
2532 * The nan, nanf and nanl functions no longer have unbounded stack usage
2533 depending on the length of the string passed as an argument to the
2534 functions. Reported by Joseph Myers. (CVE-2014-9761)
2536 * A stack-based buffer overflow was found in libresolv when invoked from
2537 libnss_dns, allowing specially crafted DNS responses to seize control
2538 of execution flow in the DNS client. The buffer overflow occurs in
2539 the functions send_dg (send datagram) and send_vc (send TCP) for the
2540 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
2541 family. The use of AF_UNSPEC triggers the low-level resolver code to
2542 send out two parallel queries for A and AAAA. A mismanagement of the
2543 buffers used for those queries could result in the response of a query
2544 writing beyond the alloca allocated buffer created by
2545 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
2546 the overflow. Thanks to the Google Security Team and Red Hat for
2547 reporting the security impact of this issue, and Robert Holiday of
2548 Ciena for reporting the related bug 18665. (CVE-2015-7547)
2550 The following bugs are resolved with this release:
2552 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
2553 [887] math: Math library function "logb" and "nextafter" inconsistent
2554 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
2555 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
2556 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
2557 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
2559 [4404] localedata: German translation of "Alarm clock" is misleading
2560 [6799] math: nextafter() and nexttoward() doen't set errno on
2561 overflow/underflow errors
2562 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
2564 [10432] nis: _nss_nis_setnetgrent assertion failure
2565 [11460] libc: fts has no LFS support
2566 [12926] network: getaddrinfo()/make_request() may spin forever
2567 [13065] nptl: Race condition in pthread barriers
2568 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
2569 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
2571 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
2572 [14912] libc: Rename non-installed bits/*.h headers
2573 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
2574 [15367] math: Let gcc use __builtin_isinf
2575 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
2576 [15421] math: lgamma wrongly sets signgam for ISO C
2577 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
2578 FE_INVALID with argument out of range
2579 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
2581 [15786] dynamic-link: ifunc resolver functions can smash function
2583 [15918] math: Unnecessary check for equality in hypotf()
2584 [16061] localedata: Review / update transliteration data
2585 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
2587 [16141] time: strptime %z offset restriction
2588 [16171] math: drem should be alias of remainder
2589 [16296] math: fegetround is pure?
2590 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
2591 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
2593 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
2594 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
2596 [16422] math: [powerpc] math-float, math-double failing llrint tests with
2597 "Exception "Inexact" set" on ppc32
2598 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
2599 [16517] math: Missing underflow exception from tanf/tan/tanl
2600 [16519] math: Missing underflow exception from sinhf
2601 [16520] math: Missing underflow exception from tanhf
2602 [16521] math: Missing underflow exception from exp2
2603 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
2605 [16734] stdio: fopen calls mmap to allocate its buffer
2606 [16961] math: nan function incorrect handling of bad sequences
2607 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
2608 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
2609 [16985] locale: localedef: confusing error message when opening output
2611 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
2612 [17197] locale: Redundant shift character in iconv conversion output at
2614 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
2615 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
2616 [17250] dynamic-link: static linking breaks nss loading
2617 (getaddrinfo/getpwnam/etc...)
2618 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
2620 [17441] math: isnan() should use __builtin_isnan() in GCC
2621 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
2622 (related to lock elision)
2623 [17787] manual: Exponent on page 324 of the PDF ends prematurely
2624 [17886] time: strptime should be able to parse "Z" as a timezone with %z
2625 [17887] time: strptime should be able to parse "+01:00" style timezones
2626 [17905] libc: catopen() Multiple unbounded stack allocations
2628 [18084] libc: backtrace (..., 0) dumps core on x86
2629 [18086] libc: nice() sets errno to 0 on success
2630 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
2631 is too large (CVE-2015-8778)
2632 [18251] dynamic-link: SONAME missing when audit modules provides path
2633 [18265] libc: add attributes for wchar string and memory functions
2634 [18370] math: csqrt missing underflows
2635 [18421] libc: [hppa] read-only segment has dynamic relocations
2636 [18472] libc: Obsolete syscall wrappers should be compat symbols
2637 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
2638 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
2639 [18525] localedata: Remove locale timezone information
2640 [18560] libc: [powerpc] spurious bits/ipc.h definitions
2641 [18568] localedata: Update locale data to Unicode 8.0
2642 [18589] locale: sort-test.sh fails at random
2643 [18595] math: ctan, ctanh missing underflows
2644 [18604] libc: assert macro-expands its argument
2645 [18610] math: S390: fetestexcept() reports any exception if DXC-code
2646 contains a vector instruction exception.
2647 [18611] math: j1, jn missing errno setting on underflow
2648 [18618] localedata: sync Chechen locale definitions with other *_RU
2650 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
2651 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
2652 [18665] network: In send_dg, the recvfrom function is NOT always using the
2653 buffer size of a newly created buffer (CVE-2015-7547)
2654 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
2656 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
2658 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
2659 [18699] math: tilegx cproj() for various complex infinities does not yield
2661 [18724] libc: Harden put*ent functions against data injection
2662 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
2663 [18755] build: build errors with -DNDEBUG
2664 [18757] stdio: fmemopen fails to set errno on failure
2665 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
2667 [18781] libc: openat64 lacks O_LARGEFILE
2668 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
2669 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
2670 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
2671 [18790] math: [ldbl-128ibm] tanhl inaccurate
2672 [18795] libc: stpncpy fortification misses buffer lengths that are
2673 statically too large
2674 [18796] build: build fails for --disable-mathvec
2675 [18803] math: hypot missing underflows
2676 [18820] stdio: fmemopen may leak memory on failure
2677 [18823] math: csqrt spurious underflows
2678 [18824] math: fma spurious underflows
2679 [18825] math: pow missing underflows
2680 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
2681 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
2682 [18870] build: sem_open.c fails to compile with missing symbol
2684 [18872] stdio: Fix memory leak in printf_positional
2685 [18873] libc: posix_fallocate overflow check ineffective
2686 [18875] math: Excess precision leads incorrect libm
2687 [18877] libc: arm: mmap offset regression
2688 [18887] libc: memory corruption when using getmntent on blank lines
2689 [18918] localedata: hu_HU: change time to HH:MM:SS format
2690 [18921] libc: Regression: extraneous stat() and fstat() performed by
2692 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
2693 binaries (CVE-2015-8777)
2694 [18951] math: tgamma missing underflows
2695 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
2697 [18953] localedata: lt_LT: change currency symbol to the euro
2698 [18956] math: powf inaccuracy
2699 [18961] math: [i386] exp missing underflows
2700 [18966] math: [i386] exp10 missing underflows
2701 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
2702 [18969] build: multiple string test failures due to missing locale
2704 [18970] libc: Reference of pthread_setcancelstate in libc.a
2705 [18977] math: float / long double Bessel functions not in XSI POSIX
2706 [18980] math: i386 libm functions return with excess range and precision
2707 [18981] math: i386 scalb*, ldexp return with excess range and precision
2708 [18982] stdio: va_list and vprintf
2709 [18985] time: Passing out of range data to strftime() causes a segfault
2711 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
2712 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
2713 [19012] locale: iconv_open leaks memory on error path
2714 [19016] math: clog, clog10 inaccuracy
2715 [19018] nptl: Mangle function pointers in tls_dtor_list
2716 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
2717 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
2718 [19048] malloc: malloc: arena free list can become cyclic, increasing
2720 [19049] math: [powerpc] erfc incorrect zero sign
2721 [19050] math: [powerpc] log* incorrect zero sign
2722 [19058] math: [x86_64] Link fail with -fopenmp and -flto
2723 [19059] math: nexttoward overflow incorrect in non-default rounding modes
2724 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
2725 [19074] network: Data race in _res_hconf_reorder_addrs
2726 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
2727 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
2728 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
2730 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
2732 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
2733 [19086] manual: posix_fallocate64 documented argument order is wrong.
2734 [19088] math: lround, llround missing exceptions close to overflow
2736 [19094] math: lrint, llrint missing exceptions close to overflow threshold
2737 [19095] math: dbl-64 lrint incorrect for 64-bit long
2738 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
2739 [19124] dynamic-link: ld.so failed to build with older assmebler
2740 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
2741 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
2742 [19134] math: [powerpc32] lround, lroundf spurious exceptions
2743 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
2744 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
2745 pthread_setaffinity_np
2746 [19156] math: [ldbl-128] j0l spurious underflows
2747 [19164] nptl: tst-getcpu fails with many possible CPUs
2748 [19168] math: math/test-ildoubl and math/test-ldouble failure
2749 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
2750 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
2752 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
2753 (FE_NOMASK_ENV) do not clear SSE exceptions
2754 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
2755 _int_new_arena/reused_arena
2756 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
2757 [19201] math: dbl-64 remainder incorrect sign of zero result
2758 [19205] math: bits/math-finite.h conditions do not match math.h and
2760 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
2761 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
2762 for C99-based standards
2763 [19212] libc: features.h not -Wundef clean
2764 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
2766 [19214] libc: Family and model identification for AMD CPU's are incorrect.
2767 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
2768 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
2770 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
2771 "inexact" exceptions
2772 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
2774 [19242] libc: strtol incorrect in Turkish locales
2775 [19243] malloc: reused_arena can pick an arena on the free list, leading
2776 to an assertion failure and reference count corruption
2777 [19253] time: tzset() ineffective when temporary TZ did not include DST
2779 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
2780 [19270] math: [hppa] Shared libm missing __isnanl
2781 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
2782 MAP_HUGETLB and MAP_STACK defines
2783 [19313] nptl: Wrong __cpu_mask for x32
2784 [19347] libc: grantpt: try to force a specific gid even without pt_chown
2785 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
2786 [19350] math: [ldbl-128ibm] sinhl spurious overflows
2787 [19351] math: [ldbl-128ibm] logl inaccurate near 1
2788 [19363] time: x32: times() return value wrongly truncates/sign extends
2790 [19367] dynamic-link: Improve branch prediction on Silvermont
2791 [19369] network: Default domain name not reset by res_ninit when "search"
2792 / "domain" entry is removed from resolv.conf
2793 [19375] math: powerpc: incorrect results for POWER7 logb with negative
2795 [19385] localedata: bg_BG: time separator should be colon, not comma
2796 [19408] libc: linux personality syscall wrapper may erroneously return an
2797 error on 32-bit architectures
2798 [19415] libc: dladdr returns wrong names on hppa
2799 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
2800 IBM905, IBM907, and IBM909
2801 [19439] math: Unix98 isinf and isnan functions conflict with C++11
2802 [19443] build: build failures with -DDEBUG
2803 [19451] build: Make check fails on test-double-vlen2
2804 [19462] libc: Glibc failed to build with -Os
2805 [19465] math: Wrong code with -Os
2806 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
2808 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
2810 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
2811 [19486] math: S390: Math tests fail with "Exception Inexact set".
2812 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
2813 [19550] libc: [mips] mmap negative offset handling inconsistent with other
2815 [19590] math: Fail to build shared objects that use libmvec.so functions.
2819 * The following bugs are resolved with this release:
2821 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
2822 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
2823 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
2824 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
2825 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
2826 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
2827 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
2828 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
2829 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
2830 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
2831 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
2832 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
2833 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
2834 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
2835 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
2836 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
2837 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
2838 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
2839 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
2840 18657, 18676, 18694, 18696, 18887.
2842 * Cache information can be queried via sysconf() function on s390 e.g. with
2843 _SC_LEVEL1_ICACHE_SIZE as argument.
2845 * A buffer overflow in gethostbyname_r and related functions performing DNS
2846 requests has been fixed. If the NSS functions were called with a
2847 misaligned buffer, the buffer length change due to pointer alignment was
2848 not taken into account. This could result in application crashes or,
2849 potentially arbitrary code execution, using crafted, but syntactically
2850 valid DNS responses. (CVE-2015-1781)
2852 * The time zone file parser has been made more robust against crafted time
2853 zone files, avoiding heap buffer overflows related to the processing of
2854 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
2855 large time zone data files. Overly long time zone specifiers in the TZ
2856 variable no longer result in stack overflows and crashes.
2858 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
2859 for LD and GD on x86 and x86-64, has been implemented. You will need
2860 binutils-2.24 or later to enable this optimization.
2862 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
2863 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
2864 Hat). These updates cause user visible changes, such as the fix for bug
2867 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
2868 and getXXbyYY NSS calls for the same database, causing a denial-of-service
2869 condition in some applications.
2871 * Added vector math library named libmvec with the following vectorized x86_64
2872 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
2874 The library can be disabled with --disable-mathvec. Use of the functions is
2875 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
2876 Shared library libmvec.so is linked in as needed when using -lm (no need to
2877 specify -lmvec explicitly for not static builds).
2878 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
2880 * A new fmemopen implementation has been added with the goal of POSIX
2881 compliance. The new implementation fixes the following long-standing
2882 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
2883 old implementation is still present for use be by existing binaries.
2885 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
2886 releases. It has been fixed to match 2.19 and older, but binaries built
2887 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
2889 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
2890 Contributed by Roland McGrath (Google).
2892 * The header <regexp.h> is deprecated, and will be removed in a future
2893 release. Use of this header will trigger a deprecation warning.
2894 Application developers should update their code to use <regex.h> instead.
2896 This header was formerly part of SUS, but was deprecated in 1994 and
2897 removed from the standard in 2001. Also, the glibc implementation
2898 leaks memory. See BZ#18681 for more details.
2902 * The following bugs are resolved with this release:
2904 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
2905 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
2906 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
2907 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
2908 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
2909 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
2910 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
2911 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
2912 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
2913 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
2916 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
2917 too little memory for the to-be-scanned arguments and overflow the
2918 allocated buffer. The implementation now correctly computes the required
2919 buffer size when using malloc, and switches to malloc from alloca as
2922 * A new semaphore algorithm has been implemented in generic C code for all
2923 machines. Previous custom assembly implementations of semaphore were
2924 difficult to reason about or ensure that they were safe. The new version
2925 of semaphore supports machines with 64-bit or 32-bit atomic operations.
2926 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
2927 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
2929 * Port to Altera Nios II has been contributed by Mentor Graphics.
2931 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
2932 implementations for powerpc64/powerpc64le.
2933 Implemented by Adhemerval Zanella (IBM).
2935 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
2936 and powerpc64le. This may improve lock scaling of existing programs on
2937 HTM capable systems. The lock elision code is only enabled with
2938 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
2939 powerpc will issue a transaction abort on every syscall to avoid side
2940 effects being visible outside transactions.
2942 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
2943 AArch64. Contributed by ARM Ltd.
2945 * i386 memcpy functions optimized with SSE2 unaligned load/store.
2947 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
2948 under certain input conditions resulting in the execution of a shell for
2949 command substitution when the application did not request it. The
2950 implementation now checks WRDE_NOCMD immediately before executing the
2951 shell and returns the error WRDE_CMDSUB as expected.
2953 * CVE-2012-3406 printf-style functions could run into a stack overflow when
2954 processing format strings with a large number of format specifiers.
2956 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
2957 infinite loop if the DNS response contained a PTR record of an unexpected
2960 * The minimum GCC version that can be used to build this version of the GNU
2961 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
2962 still be used to compile programs using the GNU C Library.
2964 * The GNU C Library is now built with -Werror by default. This can be
2965 disabled by configuring with --disable-werror.
2967 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
2969 * The obsolete sigvec function has been removed. This was the original
2970 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
2971 programs have been using instead for about 25 years. Of course, ABI
2972 compatibility for old binaries using sigvec remains intact.
2974 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
2975 with newer versions of bison.
2977 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
2978 The original MIPS o32 hard-float ABI requires an FPU where double-precision
2979 registers overlay two consecutive single-precision registers. MIPS32R2
2980 introduced a new FPU mode (FR=1) where double-precision registers extend the
2981 corresponding single-precision registers which is incompatible with the
2982 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
2983 require the use of FR=1 making a transition necessary. New o32 ABI
2984 extensions enable users to migrate over time from the original o32 ABI
2985 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
2986 tracks the ABI of any loaded object and verifies that new objects are
2987 compatible. Mode transitions will also be requested as required and
2988 unsupportable objects will be rejected. The ABI checks include both soft and
2989 hard float ABIs for o32, n32 and n64.
2991 GCC 5 with GNU binutils 2.25 onwards:
2992 It is strongly recommended that all o32 system libraries are built using the
2993 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
2994 with the original and all new o32 ABI extensions. Configure a MIPS GCC
2995 compiler using --with-fp-32=xx to set this by default.
2999 * The following bugs are resolved with this release:
3001 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
3002 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
3003 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
3004 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
3005 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
3006 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
3007 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
3008 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
3009 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
3010 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
3011 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
3012 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
3013 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
3014 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
3015 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
3017 * Reverted change of ABI data structures for s390 and s390x:
3018 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
3019 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
3020 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
3021 are preserved pointing straight to the same implementation as the old ones.
3022 Given that, new callers will simply provide a too-big buffer to these
3023 functions. Any applications/libraries out there that embed jmp_buf or
3024 ucontext_t in an ABI-relevant data structure that have already been rebuilt
3025 against 2.19 headers will have to rebuilt again. This is necessary in any
3026 case to revert the breakage in their ABI caused by the glibc change.
3028 * Support for file description locks is added to systems running the
3029 Linux kernel. The standard file locking interfaces are extended to
3030 operate on file descriptions, not file descriptors, via the use of
3031 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
3032 are associated with an open file instead of a process.
3034 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
3036 * The minimum Linux kernel version that this version of the GNU C Library
3037 can be used with is 2.6.32.
3039 * Running the testsuite no longer terminates as soon as a test fails.
3040 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3041 with PASS or FAIL lines for individual tests. A summary of the results is
3042 printed, including a list of failing lists, and "make check" exits with
3043 error status if there were any unexpected failures. "make check
3044 stop-on-test-failure=y" may be used to keep the old behavior.
3046 * The am33 port, which had not worked for several years, has been removed
3049 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3050 supported; they now act the same as _DEFAULT_SOURCE (but generate a
3051 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
3052 conflicted with POSIX (support for which was removed in 2.19), the
3053 interfaces those macros enabled remain available when compiling with
3054 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3055 test macros defined.
3057 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
3059 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3060 This may improve lock scaling of existing programs on TX capable systems.
3061 The lock elision code is only built with --enable-lock-elision=yes and
3062 then requires a GCC version supporting the TX builtins. With lock elision
3063 default mutexes are elided via __builtin_tbegin, if the cpu supports
3064 transactions. By default lock elision is not enabled and the elision code
3067 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3068 copy the path argument. This allowed programs to cause posix_spawn to
3069 deference a dangling pointer, or use an unexpected pathname argument if
3070 the string was modified after the posix_spawn_file_actions_addopen
3073 * All supported architectures now use the main glibc sysdeps directory
3074 instead of some being in a separate "ports" directory (which was
3075 distributed separately before glibc 2.17).
3077 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3078 On configurations that support it (all Linux configurations), it's now
3079 used regardless of the --enable-add-ons switch to configure. It is no
3080 longer possible to build such configurations without pthreads support.
3082 * Locale names, including those obtained from environment variables (LANG
3083 and the LC_* variables), are more tightly checked for proper syntax.
3084 setlocale will now fail (with EINVAL) for locale names that are overly
3085 long, contain slashes without starting with a slash, or contain ".." path
3086 components. (CVE-2014-0475) Previously, some valid locale names were
3087 silently replaced with the "C" locale when running in AT_SECURE mode
3088 (e.g., in a SUID program). This is no longer necessary because of the
3091 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3092 with application code using Intel MPX instructions. (With all previous
3093 versions, the MPX register state could be clobbered when making calls
3094 into or out of a shared library.) Note that while the new dynamic
3095 linker is compatible with all known x86 hardware whether or not it
3096 supports Intel MPX, some x86 instruction-set emulators might fail to
3097 handle the new instruction encodings. This is known to affect Valgrind
3098 versions up through 3.9 (but will be fixed in the forthcoming 3.10
3099 release), and might affect other tools that do instruction emulation.
3101 * Support for loadable gconv transliteration modules has been removed.
3102 The support for transliteration modules has been non-functional for
3103 over a decade, and the removal is prompted by security defects. The
3104 normal gconv conversion modules are still supported. Transliteration
3105 with //TRANSLIT is still possible, and the //IGNORE specifier
3106 continues to be supported. (CVE-2014-5119)
3108 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3109 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3110 resulting a denial-of-service security vulnerability in applications which
3111 use functions related to iconv. (CVE-2014-6040)
3115 * The following bugs are resolved with this release:
3117 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3118 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3119 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3120 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3121 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3122 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3123 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3124 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3125 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3126 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3127 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3128 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3129 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3130 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3131 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3132 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3133 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3134 16431, 16453, 16474, 16506, 16510, 16529
3136 * Slovenian translations for glibc messages have been contributed by the
3137 Translation Project's Slovenian team of translators.
3139 * The public headers no longer use __unused nor __block. This change is to
3140 support compiling programs that are derived from BSD sources and use
3141 __unused internally, and to support compiling with Clang's -fblock
3142 extension which uses __block.
3144 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3145 large collation sequences to optimize multiple passes. This cache
3146 computation may overflow for large collation sequences and may cause a
3147 stack or buffer overflow. This is now fixed to use a slower algorithm
3148 which does not use a cache if there is an integer overflow.
3150 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3151 rules for large collation sequences to optimize multiple passes and falls
3152 back to alloca if malloc fails, resulting in a possible stack overflow.
3153 The implementation now falls back to an uncached collation sequence lookup
3156 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3157 initialized for static applications resulting in the security feature
3158 being disabled. The pointer guard is now correctly initialized to a
3159 random value for static applications. Existing static applications need
3160 to be recompiled to take advantage of the fix (bug 15754).
3162 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3163 to the d_name member of struct dirent, or omit the terminating NUL
3164 character. (Bugzilla #14699).
3166 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3167 aligned_alloc functions could allocate too few bytes or corrupt the
3168 heap when passed very large allocation size values (Bugzilla #15855,
3171 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3172 for AF_INET6 has been fixed (Bugzilla #16072).
3174 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3175 pap_CW, quz_PE, the_NP.
3177 * Substantially revised locales: gd_GB, ht_HT
3179 * The LC_ADDRESS field was updated to support country_car for almost all
3182 * ISO 1427 definitions were updated.
3184 * ISO 3166 definitions were updated.
3186 * The localedef utility now supports --big-endian and --little-endian
3187 command-line options to generate locales for a different system from that
3188 for which the C library was built.
3190 * Binary locale files now only depend on the endianness of the system for
3191 which they are generated and not on other properties of that system. As a
3192 consequence, binary files generated with new localedef may be incompatible
3193 with old versions of the GNU C Library, and binary files generated with
3194 old localedef may be incompatible with this version of the GNU C Library,
3195 in the following circumstances:
3197 + Locale files may be incompatible on m68k systems.
3199 + Locale archive files (but not separate files for individual locales) may
3200 be incompatible on systems where plain "char" is signed.
3202 * The configure option --disable-versioning has been removed. Builds with
3203 --disable-versioning had not worked for several years.
3205 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3206 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3208 * SystemTap probes for malloc have been introduced.
3210 * SystemTap probes for slow multiple precision fallback paths of
3211 transcendental functions have been introduced.
3213 * Support for powerpc64le has been added.
3215 * The soft-float powerpc port now supports e500 processors.
3217 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3219 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3220 set of header declarations that are enabled by default, even when other
3221 feature test macros or compiler options such as -std=c99 would otherwise
3222 disable some of those declarations.
3224 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3225 conflict with POSIX. The libbsd-compat library (which was a dummy library
3226 that did nothing) has also been removed.
3228 * Preliminary documentation about Multi-Thread, Async-Signal and
3229 Async-Cancel Safety has been added.
3231 * Change of ABI data structures for s390 and s390x:
3232 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3233 allow for future hardware extensions. All library functions that accept or
3234 return these structures were versioned in order to provide backwards
3235 compatibility with existing code. However, not all cases can be handled
3236 with interface versioning. If an application embeds either structure into
3237 another structure and that structure is passed to another compilation unit
3238 which expects the newer larger-sized object then any access to the new
3239 fields will result in undefined behaviour. Similarly any access to fields
3240 that were moved by the enlarging of the structures will cause undefined
3241 behaviour. To fix the undefined behaviour all objects that are part of the
3242 final in-memory image must agree on the size of structures, and this may
3243 require recompilation.
3247 * The following bugs are resolved with this release:
3249 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3250 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3251 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3252 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3253 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3254 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3255 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3256 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3257 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3258 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3259 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3260 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3261 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3264 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3265 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3266 Distributions can re-enable building and using pt_chown via the new configure
3267 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
3268 considerable security risks and should only be used if the distribution
3269 understands and accepts the risks.
3271 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3274 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3275 fixed (Bugzilla #15330).
3277 * Add support for calling C++11 thread_local object destructors on thread
3278 and program exit. This needs compiler support for offloading C++11
3279 destructor calls to glibc.
3281 * Improved worst case performance of libm functions with double inputs and
3284 * Support for priority inherited mutexes in pthread condition variables on
3285 non-x86 architectures.
3287 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
3289 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
3291 * Optimized string functions for ARM. Implemented by Will Newton and
3294 * Optimized libm functions for SPARC. Implemented by David S. Miller.
3296 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
3299 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
3300 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
3302 * Added a benchmark framework to track performance of functions in glibc.
3304 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
3305 It is based on draft TS 18661 and currently enabled as a GNU extension.
3307 * On Linux, the clock function now uses the clock_gettime system call
3308 for improved precision, rather than old times system call.
3310 * Added support for version-3 tz format files. This is needed when using
3311 the tz database release 2013e or later, and affects a few unusual cases --
3312 currently only TZ='America/Godthab' for time stamps after 2037.
3314 * Added new API functions pthread_getattr_default_np and
3315 pthread_setattr_default_np to get and set the default pthread
3316 attributes of a process.
3318 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
3319 This may improve lock scaling of existing programs on TSX capable systems.
3320 When the --enable-lock-elision=yes parameter is specified at configure
3321 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
3324 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
3325 availability). Implemented by Ryan S. Arnold.
3327 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
3331 * The following bugs are resolved with this release:
3333 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
3334 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
3335 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
3336 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
3337 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
3338 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
3339 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
3340 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
3341 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
3342 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
3343 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
3344 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
3345 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
3346 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
3347 14879, 14889, 14893, 14898, 14914.
3349 * Optimization of memcpy for MIPS.
3351 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
3352 EMFILE has been fixed (Bugzilla #14889).
3354 * The add-on ports collection is now distributed in the "ports" subdirectory
3355 of the main GNU C Library distribution, rather than separately.
3357 * Port to ARM AArch64 contributed by Linaro.
3359 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
3360 Optimized versions of memcpy, memset, and memcmp added for System z10 and
3362 Implemented by Andreas Krebbel.
3364 * The new function secure_getenv allows secure access to the environment,
3365 returning NULL if running in a SUID/SGID process. This function replaces
3366 the internal function __secure_getenv.
3368 * SystemTap static probes have been added into the dynamic linker.
3369 Implemented by Gary Benson.
3371 * Optimizations of string functions strstr, strcasestr and memmem.
3372 Implemented by Maxim Kuvyrkov.
3374 * The minimum Linux kernel version that this version of the GNU C Library
3375 can be used with is 2.6.16.
3377 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
3378 powerpc POWER7. Implemented by Will Schmidt.
3380 * New configure option --disable-nscd builds the C library such that it
3381 never attempts to contact the Name Service Caching Daemon (nscd).
3382 New configure option --disable-build-nscd avoids building nscd itself;
3383 this is the default if --disable-nscd is used.
3385 * Improved support for cross-compilation, including cross-testing and
3386 bootstrap builds without a previously built glibc.
3388 * Several testsuite tests are now able to test multiple IFUNC variants of an
3389 interface, rather than just testing the one that would be chooen by
3392 * New configure options --with-bugurl and --with-pkgversion, for
3393 distributors to use to embed their bug-reporting and package version
3394 information in --help and --version output.
3396 * The ttyname and ttyname_r functions on Linux now fall back to searching for
3397 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
3398 allows creation of chroots without the procfs mounted on /proc.
3400 * The `crypt' function now fails if passed salt bytes that violate the
3401 specification for those values. On Linux, the `crypt' function will
3402 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
3403 enabled, and fail on encrypted strings using the MD5 or DES algorithm
3404 when the mode is enabled.
3406 * The `clock_*' suite of functions (declared in <time.h>) is now available
3407 directly in the main C library. Previously it was necessary to link with
3408 -lrt to use these functions. This change has the effect that a
3409 single-threaded program that uses a function such as `clock_gettime' (and
3410 is not linked with -lrt) will no longer implicitly load the pthreads
3411 library at runtime and so will not suffer the overheads associated with
3412 multi-thread support in other code such as the C++ runtime library.
3414 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
3419 * The following bugs are resolved with this release:
3421 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
3422 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
3423 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
3424 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
3425 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
3426 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
3427 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
3428 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
3429 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
3430 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
3431 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
3432 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
3433 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
3434 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
3435 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
3436 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
3437 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
3438 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
3439 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
3440 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
3441 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
3442 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
3445 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
3446 configuring glibc with:
3447 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
3448 Visit <http://sites.google.com/site/x32abi/> for more x32 ABI info.
3449 Implemented by H.J. Lu.
3453 + define static_assert
3455 + do not declare gets
3457 + declare at_quick_exit and quick_exit also for ISO C11
3459 + aligned_alloc. NB: The code is deliberately allows the size parameter
3460 to not be a multiple of the alignment. This is a moronic requirement
3461 in the standard but it is only a requirement on the caller, not the
3464 + timespec_get added
3466 + uchar.h support added
3468 + CMPLX, CMPLXF, CMPLXL added
3470 Implemented by Ulrich Drepper.
3472 * Support for the IA-64 has been moved to ports.
3474 * Remove support for anything but ELF binary format
3476 * Checking versions of poll, ppoll added.
3477 Implemented by Ulrich Drepper.
3479 * More generic and 64-bit performance optimizations to math functions.
3480 Implemented by Ulrich Drepper.
3482 * New configure option --enable-obsolete-rpc makes the deprecated RPC
3483 headers and functions available at compile time as they were before
3484 version 2.14. This option will be removed at some time in the future
3485 after the TI-RPC library becomes fully sufficient for the needs of
3486 existing applications.
3488 * Compatibility code for Linux kernel versions before 2.4 has been removed.
3489 Note that glibc is not expected to work with any Linux kernel version
3492 * New header <sys/auxv.h> and function getauxval allowing easy access to
3493 the AT_* key-value pairs passed from the Linux kernel. The header also
3494 defines the HWCAP_* bits associated with the AT_HWCAP key.
3496 * New locales: mag_IN
3498 * New configure option --enable-systemtap builds SystemTap static probes
3499 into libc for setjmp and longjmp and into libpthread for various operations.
3500 So far the setjmp/longjmp probes and some of the libpthread probes are
3501 provided only for i*86 and x86_64.
3502 Implemented by Roland McGrath and Rayson Ho.
3504 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
3506 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
3509 * More optimized functions for SPARC. Implemented by David S. Miller.
3511 * Improved support for cross-compilation, especially bootstrap builds
3512 without a previously built glibc.
3514 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
3515 Chris Metcalf from Tilera.
3517 * Support for the old ARM ABI has been removed from ports. Only the EABI is
3518 now supported for ARM processors.
3520 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
3521 as the name of the dynamic linker, to distinguish it from the
3522 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
3524 * Support for CRIS has been removed from ports.
3526 * A new class of installed header has been documented for low-level
3527 platform-specific functionality. PowerPC added the first instance with a
3528 function to provide time base register access. Contributed by Tulio
3529 Magno Quites Machado Filho.
3531 * ix86 configurations now install header files that are consistent with
3532 what x86-64 configurations install. These same header files can be used
3533 for -m32, -m64, or -mx32 builds.
3534 Contributed by H.J. Lu.
3536 * Math library bug fixes. A thorough audit of all open math library bugs was
3537 conducted by Joseph Myers. Significant progress was made on many math
3538 library bugs resulting in more accurate exceptions and function results.
3539 Many thanks to all those that contributed including Andreas Jaeger for his
3540 patch review and work on the x87 trigonometric instruction issues.
3542 * Timezone data is no longer installed. Timezone-related binaries and scripts
3543 will continue to be installed. Users should obtain their timezone data from
3544 their distribution provider or from the tzdata package at
3545 <ftp://munnari.oz.au/pub/>.
3549 * The following bugs are resolved with this release:
3551 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
3552 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
3553 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
3554 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
3555 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
3556 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
3557 13484, 13506, 13515, 13523, 13524, 13538, 13540
3559 * New program pldd to list loaded object of a process
3560 Implemented by Ulrich Drepper.
3562 * Add nss_db support back to glibc. No more dependency on Berkeley db
3563 and support for initgroups lookups.
3564 Implemented by Ulrich Drepper.
3566 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
3567 Contributed by HJ Lu.
3569 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
3570 Contributed by HJ Lu.
3572 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
3573 on x86-32 and x86-64.
3574 Contributed by Liubov Dmitrieva.
3576 * Optimized strchr and strrchr for SSE on x86-32.
3577 Contributed by Liubov Dmitrieva.
3579 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
3580 for x86-64 and x86-32.
3581 Contributed by Liubov Dmitrieva.
3583 * New interfaces: scandirat, scandirat64
3584 Implemented by Ulrich Drepper.
3586 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
3587 Implemented by Ulrich Drepper.
3589 * nscd now also caches the netgroup database.
3590 Implemented by Ulrich Drepper.
3592 * Integrate libm with gcc's -ffinite-math-only option.
3593 Implemented by Ulrich Drepper.
3595 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
3596 to math functions. Implemented by Ulrich Drepper.
3598 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
3599 Implemented by Ulrich Drepper.
3601 * New Linux interfaces: process_vm_readv, process_vm_writev
3603 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
3604 Implemented by Ulrich Drepper.
3606 * Optimized nearbyint and strcasecmp for PPC.
3607 Implemented by Adhemerval Zanella.
3609 * New locales: bho_IN, unm_US, es_CU, ta_LK
3613 * The following bugs are resolved with this release:
3615 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
3616 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
3617 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
3618 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
3619 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
3620 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
3621 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
3622 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
3623 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
3624 12795, 12811, 12813, 12814, 12841
3626 * The RPC implementation in libc is obsoleted. Old programs keep working
3627 but new programs cannot be linked with the routines in libc anymore.
3628 Programs in need of RPC functionality must be linked against TI-RPC.
3629 The TI-RPC implementation is IPv6 enabled and there are other benefits.
3631 Visible changes of this change include (obviously) the inability to link
3632 programs using RPC functions without referencing the TI-RPC library and the
3633 removal of the RPC headers from the glibc headers.
3634 Implemented by Ulrich Drepper.
3636 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
3637 syncfs, setns, sendmmsg
3639 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
3640 yue_HK, lij_IT, mhr_RU
3642 * New encodings: CP770, CP771, CP772, CP773, CP774
3644 * New program sotruss to trace calls through PLTs
3645 Implemented by Ulrich Drepper.
3647 * The malloc hook implementation is marked deprecated and will be removed
3648 from the default implementation in the next version. The design never
3649 worked ever since the introduction of threads. Even programs which do
3650 not create threads themselves can use multiple threads created internally.
3654 * The following bugs are resolved with this release:
3656 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
3657 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
3658 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
3659 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
3662 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
3664 * POWER7 optimizations: memset, memcmp, strncmp
3666 * New optimized string functions for x86-64: strnlen (SSE2),
3667 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
3668 Implemented by Ulrich Drepper.
3672 * The following bugs are resolved with this release:
3674 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
3675 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
3676 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
3677 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
3678 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
3679 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
3680 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
3681 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
3683 * New interfaces: pthread_getname_np, pthread_setname_np
3685 * New Linux interface: recvmmsg
3687 * STT_GNU_IFUNC implemented for Sparc by David Miller.
3689 * The dynamic linker now recognizes supported ABI versions from the
3690 EI_ABIVERSION field in the ELF header.
3691 Implemented by Ulrich Drepper.
3693 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
3694 will not be used to fill in password fields in the passwd.byname replies.
3695 Instead it is used to synthesize the shadow.byname table, should it be
3696 missing. This is a useful mode in some installations involving Solaris.
3697 Implemented by Ulrich Drepper.
3699 * New locales: kok_IN, sq_MK, cv_RU
3703 * The following bugs are resolved with this release:
3705 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
3706 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
3707 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
3708 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
3709 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
3710 10789, 10817, 10823, 10840, 10847
3712 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
3714 Implemented by Ulrich Drepper.
3716 * Checking version of longjmp added that fails if an uninitialized stack
3717 frame would be created. Implemented by Ulrich Drepper.
3719 * STT_GNU_IFUNC is now supported in static executables.
3720 Implemented by H.J. Lu.
3722 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
3724 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
3725 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
3726 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
3727 Contributed by H.J. Lu.
3729 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
3730 Implemented by Ulrich Drepper.
3732 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
3734 Contributed by H.J. Lu.
3736 * Support for fma instruction in AVX on x86-64.
3737 Implemented by H.J. Lu and Ulrich Drepper.
3739 * AVX support in x86-64 auditing support in ld.so.
3740 Implemented by H.J. Lu.
3742 * STB_GNU_UNIQUE support added.
3743 Implemented by Ulrich Drepper.
3745 * Implement second fallback mode for optimized DNS lookup for even more
3746 broken environments. If two requests from the same port are not
3747 handled correctly close the socket and open a new one before sending
3748 the second request. The 'single-request-reopen' option in /etc/resolv.conf
3749 can be used to select this mode right away, instead of rediscovering the
3750 necessity is every process again.
3751 Implemented by Ulrich Drepper.
3753 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
3754 Implemented by Adam Tkac.
3756 * Optimized iconv conversions for S390x.
3757 Implemented by Andreas Krebbel.
3759 * Using condvars with PI mutexes is now more efficient due to kernel
3760 support for requeueing to PI futexes. NPTL support added for x86-64.
3761 Implemented by Ulrich Drepper.
3763 * New locales: ps_AF, my_MM
3767 * The following bugs are resolved with this release:
3769 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
3770 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
3771 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
3772 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
3773 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
3775 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
3776 Implemented by Ulrich Drepper.
3778 * New Linux interfaces: accept4, fallocate, fallocate64.
3779 Implemented by Ulrich Drepper.
3781 * Correct declarations of string function when used in C++ code. This
3782 could lead to compile errors for invalid C++ code.
3784 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
3787 * New POSIX 2008 interface: psiginfo
3788 Implemented by Ulrich Drepper.
3790 * New ISO C++1x interfaces: quick_exit, at_quick_exit
3791 Implemented by Ulrich Drepper.
3793 * Support for selecting between multiple function definitions at runtime
3794 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
3796 * The libcrypt library can now use the hash function implementations in
3797 NSS. Implemented by Ulrich Drepper.
3799 * The malloc implementation can be compiled to be less memory efficient
3800 but higher performing in multi-threaded programs.
3801 Implemented by Ulrich Drepper.
3803 * New locales: nan_TW@latin, ks_IN
3805 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
3806 Implemented by Ulrich Drepper.
3808 * Extended printf hook support. It is possible to use user-defined types
3809 and extend existing format specifiers.
3810 Implemented by Ulrich Drepper.
3812 * Handling for group shadow files has been added.
3813 Implemented by Ulrich Drepper.
3815 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
3816 servers (the case, e.g., for some people using the built-in DNS
3817 server in ADSL modems/routers). There is a once-per-process timeout
3818 in case of a broken server. To avoid it, users can run nscd or put
3819 'options single-request' in /etc/resolv.conf.
3820 Implemented by Ulrich Drepper.
3824 * The following bugs are resolved with this release:
3826 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
3827 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
3828 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
3829 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
3830 6968, 6974, 6980, 6995, 7008, 7009, 7029
3832 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
3833 up at the same time. Implemented by Ulrich Drepper.
3835 * TLS descriptors for LD and GD on x86 and x86-64.
3836 Implemented by Alexandre Oliva.
3838 * getaddrinfo now handles DCCP and UDPlite.
3839 Implemented by Ulrich Drepper.
3841 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
3842 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
3843 Implemented by Ulrich Drepper.
3845 * New implementation of memmem, strstr, and strcasestr which is O(n).
3846 Implemented by Eric Blake.
3848 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
3850 * Implement "e" option for popen to open file descriptor with the
3851 close-on-exec flag set. Implemented by Ulrich Drepper.
3853 * Implement "b" mode for fmemopen. In this mode writes writes don't
3854 implicitly add a NUL byte and seeks from the end of the buffer really
3855 use the buffer end, not the string length as the basis.
3856 Implemented by Ulrich Drepper.
3858 * Many functions, exported and internal, now atomically set the close-on-exec
3859 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
3861 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
3863 Implemented by Pravin Satpute.
3865 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
3869 * The following bugs are resolved with this release:
3871 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
3872 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
3873 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
3874 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
3875 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
3876 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
3877 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
3879 * New locales: bo_CN, bo_IN, shs_CA.
3881 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
3883 * Sorting rules for some Indian languages (Devanagari and Gujarati).
3884 Implemented by Pravin Satpute.
3886 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
3888 * nscd caches now all timeouts for DNS entries
3889 Implemented by Ulrich Drepper.
3891 * nscd is more efficient and wakes up less often.
3892 Implemented by Ulrich Drepper.
3894 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
3895 vdprintf, and obstack_vprintf.
3896 Implemented by Jakub Jelinek.
3898 * Faster memset for x86-64.
3899 Implemented by Harsha Jagasia and H.J. Lu.
3901 * Faster memcpy on x86.
3902 Implemented by Ulrich Drepper.
3904 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
3905 Implemented by Ulrich Drepper.
3907 * Faster sqrt and sqrtf implemention for some PPC variants.
3908 Implemented by Steven Munroe.
3912 * The following bugs are resolved with this release:
3914 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
3915 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
3916 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
3917 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
3918 5071, 5103, 5104, 5112, 5113, 5184, 5186
3920 * More checking functions: fread, fread_unlocked, open*, mq_open.
3921 Implemented by Jakub Jelinek and Ulrich Drepper.
3923 * Extend fortification to C++. Implemented by Jakub Jelinek.
3925 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
3926 by not recognizing 'a' as a modifier when those specs are requested.
3927 Implemented by Jakub Jelinek.
3929 * PPC optimizations to math and string functions.
3930 Implemented by Steven Munroe.
3932 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
3933 options to be passed. Implemented by Ulrich Drepper.
3935 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
3937 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
3938 Implemented by Ulrich Drepper.
3940 * Handle private futexes in the NPTL implementation.
3941 Implemented by Jakub Jelinek and Ulrich Drepper.
3943 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
3944 Implemented by Roland McGrath and Ulrich Drepper.
3946 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
3948 * SHA-256 and SHA-512 based password encryption.
3949 Implemented by Ulrich Drepper.
3951 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
3952 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
3955 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
3956 Implemented by Ulrich Drepper.
3960 * The following bugs are resolved with this release:
3962 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
3963 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
3964 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
3965 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
3966 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
3967 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
3968 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
3971 * New Linux interfaces: epoll_pwait, sched_getcpu.
3973 * New generic interfaces: strerror_l.
3975 * nscd can now cache the services database. Implemented by Ulrich Drepper.
3979 * The following bugs are resolved with this release:
3981 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
3982 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
3983 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
3984 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
3985 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
3986 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
3987 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
3988 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
3989 3225, 3251, 3252, 3253, 3273
3991 * For Linux, the sorting of addresses returned by getaddrinfo now also
3992 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
3993 Implemented by Ulrich Drepper.
3995 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
3996 Implemented by Ulrich Drepper.
3998 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
4000 * New iconv module for MIK. Contributed by Alexander Shopov.
4002 * For sites with broken group and/or passwd database, the auto-propagate
4003 option of nscd can prevent creating ID lookup entries from the results
4004 of a name lookup and vice versa. This usually is no problem but some
4005 site might have problems with the default behavior.
4006 Implemented by Ulrich Drepper.
4008 * Iterating over entire database in NIS can be slow. With the
4009 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
4010 to trade time for memory. The entire database will be read at once.
4011 Implemented by Ulrich Drepper.
4013 * The interfaces introduced in RFC 3542 have been implemented by
4016 * Support for the new ELF hash table format was added by Ulrich Drepper.
4018 * Support for priority inheritance mutexes added by Jakub Jelinek and
4021 * Support for priority protected mutexes added by Jakub Jelinek.
4023 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
4024 or_IN, csb_PL, fy_NL, sr_ME.
4028 * More overflow detection functions.
4030 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
4031 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
4033 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
4034 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4035 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4036 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4037 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4038 by Masahide Washizawa.
4040 * It is now possible to install audit libraries for the dynamic linker using
4041 LD_AUDIT. Implemented by Ulrich Drepper.
4043 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4044 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
4045 For a libc and libpthread that works well on Linux 2.4 kernels, we
4046 recommend using the stable 2.3 branch.
4048 * The new function open_wmemstream acts like open_memstream,
4049 but uses a wchar_t wide character buffer.
4051 * The new function ppoll is an improved version of poll, similar to pselect.
4053 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4054 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4055 renameat, unlinkat, linkat, symlinkat, readlinkat.
4057 * New Linux kernel system calls: unshare,
4058 inotify_init, inotify_add_watch, inotify_rm_watch.
4060 * The euidaccess function is now also known by the alias eaccess,
4061 for compatibility with some other systems.
4063 * Timezone data updated to 2006b version.
4067 * The following bugs are resolved with this release:
4069 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4070 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4071 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4072 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4073 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4074 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4076 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
4078 * As of this release, GCC 4 can be used to compile the C Library.
4080 * Timezone data updated to 2005m version.
4084 * The following bugs are resolved with this release:
4086 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4087 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4088 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4089 777, 787, 821, 822, 823, 825
4091 Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
4095 * Support for RFC 3678. Real implementations exist only for Linux so far.
4096 Implemented by Ulrich Drepper.
4098 * nscd can now cache entries persistently. Expiring entries are reloaded.
4099 For speedups the cache can be shared in memory with client processes.
4100 Implemented by Ulrich Drepper.
4102 * nscd can now perform SELinux checks.
4103 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4105 * getaddrinfo queries are now cached. Canonical name lookup is performed
4107 Implemented by Ulrich Drepper.
4109 * The nothrow function attribute is used when headers are used by gcc when
4110 compiling C code. This can avoid significant amounts of exception
4113 * The malloc functions perform more error checking and are stricter when
4114 it comes to reacting on errors. The default action is to terminate
4115 the process after showing an error message. Implemented by Ulrich Drepper.
4117 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4118 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
4120 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
4121 namespaces using the new function dlmopen(). This feature is of course,
4122 like most other dynamic loading functionality, not available in statically
4123 linked applications. Implemented by Ulrich Drepper.
4125 * Low-overhead boundary checking variants of string and some stdio functions
4126 were added. These are to be used in conjunction with a gcc patch by
4127 Jakub Jelinek which adds calls to these functions if possible.
4128 Implemented by Jakub Jelinek and Ulrich Drepper.
4130 * Old code for several operating systems and machine architectures that
4131 have not been in working condition in a long time have been removed from
4132 the main source tree maintained by the GNU C Library's maintainers.
4133 These files are now reside in the separate `ports' source module
4134 that is usable as an add-on when building the library.
4138 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4139 interrogate the dynamic linker, compatible with the Solaris interface.
4141 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4142 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4144 * getifaddrs now uses the netlink interface on Linux to get its information.
4145 Implemented by Thorsten Kukuk.
4147 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4148 Implemented by Ulrich Drepper.
4150 * support for non-executable stacks on x86 has been added. Changes mostly
4153 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
4156 * getaddrinfo now performs destination address selection according to
4161 * Thread-safe interfaces for many functions that access locale data
4162 were added in version 2.3, but these features were omitted from NEWS.
4163 Many functions have variants with an `_l' suffix that take a `locale_t'
4164 object as a parameter rather than consulting the current locale.
4165 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4166 create and maintain `locale_t' objects. Additionally, the new function
4167 `uselocale' sets "the current locale" (as used by functions not so
4168 parameterized) set for an individual thread. These features were added
4169 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4171 * The functions getresuid, getresgid, setresuid, and setresgid, which
4172 have long been available on Linux, are now declared in <unistd.h>
4173 and are now also available on the Hurd.
4175 * ELF thread-local storage support (TLS) now works on x86-64.
4177 * The new dynamic string token $LIB is expanded in shared library names.
4178 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4180 * Aldy Hernandez contributed complete software floating point support for
4181 PowerPC machines with no FPU.
4183 * fexecve is implemented on Linux.
4185 * The `btowc' function should work at least twice as fast due to
4186 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
4188 * With approriate thread add-ons cancelable functions are now implemented
4189 in libc.so as well. No need to call the function in libpthread. This
4190 change allowed to finally disable the incorrect and expensive handling
4191 of weak definition in ld.so.
4193 * Yet more PLT entries in libc.so have been removed. We finally arrived
4194 at the bare minimum. Startup times improved appropriately.
4196 * Support for the new Linux/x86 system call interface was added. The
4197 AT_SYSINFO auxiliary vector entry is recognized and handled.
4201 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4204 * iconv (the program and the interface) now accepts empty names (excluding
4205 options like //TRANSLIT) to mean "use charset of current locale".
4207 * localedef can now transliterate characters in strings which are not in
4208 the provided charmap. The information from the input locale is used.
4210 * Prelinking support was added for ELF targets. This requires additional
4211 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
4213 * Read-only stdio streams now use mmap to speed up operation by eliminating
4214 copying and buffer underflows. To use add 'm' to the mode string of
4215 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
4217 * The malloc functions were completely rewritten by Wolfram Gloger based
4218 on Doug Lea's malloc-2.7.0.c.
4220 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4221 implementation of regex.
4223 * Bruno Haible upgraded the iconv and locale implementation to support
4226 * Contents of the LC_* and LANG environment variables in the CEN style are
4227 not recognized anymore. It never was used. Change by Ulrich Drepper.
4229 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4230 thread-local storage (TLS) ABI on some platforms.
4231 Changes by Ulrich Drepper. SH support by Kaz Kojima.
4233 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4234 EUC-JISX0213, and TSCII.
4236 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4237 BSD-compatible interface for getting all network interface addresses.
4238 Implementation for IPv4 by Roland McGrath.
4240 * Loading of locale data is faster due to the introduction of a locale
4241 archive. Implemented by Roland McGrath and Ulrich Drepper.
4243 * Startup times are significantly reduced by not using exported functions
4244 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
4247 * Steven Munroe contributed a port to PowerPC64/Linux.
4251 * The Hurd now uses the GNU libio implementation of stdio rather than the
4252 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4254 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4255 with the same behavior as the Linux system call of the same name.
4259 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4260 128-bit long double format.
4262 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4263 IBM1161, and IBM1162 charsets.
4265 * Andreas Jaeger contributed a port to x86-64/Linux.
4267 * Peter Bruin contributed a port to PowerPC/Hurd.
4269 * libc functions using I/O streams now can handle wide-oriented streams
4272 * optimizations in the dynamic linker. Binaries created by recent binutils
4273 versions start up quicker due to reduced time spent on relocations.
4275 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
4279 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
4280 asinh, atanh, j0 for the 128-bit long double format.
4282 * Bruno Haible updated all the code handling Unicode in some form to
4283 support Unicode 3.1.
4285 * Speed of regex for single-byte locales is back to previous levels.
4286 Patch by Isamu Hasegawa.
4288 * Alpha, SPARC, and IA-64 now also using floating stacks.
4290 * Startup time of internationalized applications greatly improved through
4291 iconv cache. Use iconvconfig to generate the cache file.
4292 Contributed by Ulrich Drepper.
4294 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
4295 severe performance problems. Patch by David Mosberger.
4297 * The Hurd port got a lot more functionality like AIO, various stdio
4298 extensions, etc. Mainly done by Roland McGrath.
4300 * mtrace can now lookup symbols in shared libraries.
4304 * Intel's IA-64 math library is largely integrated. It provides fast and
4305 accurate implementatations for most basic and standard math functions
4306 in float, double, and long double format.
4308 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
4309 and asin for the 96-bit long double format and asin, log, tan for the
4310 128-bit long double format.
4312 * The beginning of a last-bit accurate math library by IBM Haifa were added.
4313 The basic double functions exist today. Contributed by Abraham Ziv
4314 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
4315 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
4317 * An asynchronous name lookup library was added. The interface is designed
4318 after POSIX AIO. The proposal was circulated beforehand to get comments.
4319 No negative ones came in. Implemented by Ulrich Drepper.
4321 * Port to S390/64bit contributed by Martin Schwidefsky
4322 <schwidefsky@de.ibm.com>.
4324 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
4325 of functions for Linux/IA-64.
4327 * The RPC code is now thread safe. Threads can now use the same service
4328 of different services at the same time. Patch by Eric Norum
4329 <eric.norum@usask.ca> with some help by Ulrich Drepper.
4331 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
4332 family of functions for Linux/S390.
4334 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
4335 of functions for Linux/x86.
4337 * Port to Linux/CRIS contributed by Axis Communications.
4341 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
4342 we can now check for namespace violations and missing declarations. The
4343 result is that almost all headers are now Unix-compliant (as defined in
4344 the upcoming XPG6). The negative side is that some programs might need
4345 corrections, too, if they depend on the incorrect form of the headers in
4346 previous versions which defined too many symbols and included too many
4349 * regex now handles multibyte character sets correctly.
4350 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
4352 * iconv (the program) does now conform to the upcoming XPG6 and handles
4353 charmaps. Instead of the charset names the path of charmaps can be
4354 provided and the conversion happens based on this data.
4355 Contributed by Ulrich Drepper.
4357 * The locale program now provides detailed information about the installed
4362 only lists the names of the supported locales
4366 provides details such as country, language, and codeset name.
4367 Contributed by Ulrich Drepper.
4371 * The gencat program now parses the input file according to the charset
4372 selected by the LC_CTYPE category. This is important for stateful
4373 character sets. To make generating catalogs easier there is a way
4374 to overwrite the charset selected by the locale: before the first
4375 message or $ quote line the catalog can contain a line like
4377 $ codeset=ISO-8859-2
4379 to select the charset (ISO-8859-2 in this case).
4381 Implemented by Shinya Hanataka and Ulrich Drepper.
4383 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
4384 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
4385 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
4387 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
4388 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
4390 * The LANGUAGE environment variable is now ignored unless the locale is
4391 changed from the default "C" locale.
4393 * The usual bug fixes.
4397 * Greg McGary added runtime support for bounds checking using gcc's
4398 new -fbounded-pointers option. ix86 target is complete. PowerPC
4401 * Thorsten Kukuk added secure mode support to nscd.
4403 * The Berkeley db libraries have been removed.
4405 Related, the nss_db module is now in a separate package since it
4406 obviously requires a database library being available.
4408 * Wide character I/O streams implemented by Ulrich Drepper.
4410 * Functions from the extended socket API added by Ulrich Drepper.
4412 * Functions feenableexcept and fedisableexcept to control the
4413 behaviour of individual exceptions have been added by Andreas Jaeger.
4415 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
4417 * The resolver code has been updated from bind 8.2.3-T5B which supports
4418 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
4421 This change could in some situations effect backward compatibility. Since
4422 now `_res' is a thread-local instead of a global variable, modifying it
4423 in one thread does not have any effect in other threads.
4425 The resolver library was also extended to allow IPv6 as the transport
4426 protocol for the requests. This work was done by Stig Venaas.
4428 * Compatibility code for K&R C compilers has been removed from the
4429 header files. A ISO C compiler is needed to use the library
4430 (conforming to either C89 or C99 standard).
4432 * Complete rewrite of the localedef program to support multibyte character
4433 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
4434 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
4435 Implemented by Ulrich Drepper.
4437 Bruno Haible significantly improved the generation and use of the data
4438 structures for the wide character tables.
4440 * Plural handling in gettext implemented by Ulrich Drepper.
4442 * The utmp daemon has been removed.
4444 * The port to MIPS-Linux has been finished by Andreas Jaeger.
4446 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
4449 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
4451 * POSIX barriers implemented by Kaz Kylheku.
4453 * POSIX spawn function family implemented by Ulrich Drepper.
4455 * POSIX spinlocks are now available.
4457 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
4459 * the configure option --enable-kernel=X.Y.Z allows to strip out
4460 compatibility for kernel versions before X.Y.Z. This is currently only
4461 implemented for Linux.
4463 * the sockaddr_in6 structure changed. The IPv6 working group added a new
4464 field sin6_scope_id. This means that all programs using IPv6 should be
4465 recompiled. Don't expect binary compatibility with previous glibc
4468 * various conversion modules for IBM character sets contributed by
4471 * IA-64 port by Jes Sorensen and HJ Lu.
4485 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
4487 * New xdr functions are added; some rpc functions are now 64bit clean.
4489 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
4491 * Fixed known incompatibilities with glibc 2.0.
4493 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
4495 * Optimized a number of functions (especially the ELF dynamic loader).
4497 * Update timezone data files.
4499 * lots of charmaps corrections
4501 * some new locale definitions and charmaps
4506 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
4507 conform to POSIX member type requirements. Symbol versions have been
4508 adjusted as needed within the library, and for direct use by applications,
4509 but there is potential for problems if third-party libraries use
4510 struct timeval as part of their interface. This does not present
4511 a problem for X and other "essential" system libraries.
4513 * An additional locale model to support C++ Standard Library locale
4514 model and probably more was implemented by Ulrich Drepper.
4516 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
4519 * Miles Bader provided the `argp' function family to support hierachical
4520 command line argument parsing, layered on top of getopt.
4522 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
4524 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
4527 * scanf recognizes the %a and %A format for scanning floating point numbers.
4529 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
4530 information and interfaces for the available integer types.
4532 * about 130 new math functions were added to implement the ISO C9x math
4535 * the new header <complex.h> contains definitions of the complex math
4536 functions from ISO C 9X.
4538 * the new header <tgmath.h> defines generic macros to use complex or
4539 real valued functions.
4541 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
4543 * Andreas Jaeger provided a test suite for the math library.
4545 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
4547 * Ulrich Drepper added character set conversion functions (iconv).
4549 * Optimized string functions have been added.
4551 * The localedata addon is now part of glibc.
4553 * An implementation of profiling shared libraries was added by Ulrich Drepper.
4555 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
4556 daemon for NSS (nscd).
4558 Missing a better place here are some numbers on improvements. Under
4559 Linux 2.1.125 un-tar-ing the kernel sources takes
4563 using local files 12.19s 6.88s 22.91s
4565 using NIS 13.92s 8.91s 26.34s
4567 using NIS & nscd 10.37s 7.34s 25.30s
4569 using NIS+ 27.57s 30.37s 640.46s
4571 using NIS+ & nscd 10.25s 7.83s 26.51s
4573 using NIS & old nscd [1] 13.83s 8.32s 29.60s
4575 Keep in mind that non-namelookup related operations dominate above times.
4576 It was just a common complain that using NIS+ unpacking the kernel is
4579 [1] The old nscd implementation is not available anymore since it was
4580 distributed with glibc up to version 2.0.98 and thus is now replaced.
4582 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
4584 * Mark Kettenis provided a Hesiod NSS module.
4586 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
4587 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
4589 * rcmd can now handle netgroups (Dick Streefland).
4591 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
4594 * Support for the IPv6 protocol has been added to the socket API, as per the
4595 latest draft standards.
4597 * Support for Linux 2.2 has been added.
4599 * Interface changes relative to the latest 2.0.x release:
4600 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4601 addseverity NEW: Unix98
4602 alphasort64 NEW: LFS
4603 argp_err_exit_status NEW: argp, GNU ext
4604 argp_error NEW: argp, GNU ext
4605 argp_failure NEW: argp, GNU ext
4606 argp_help NEW: argp, GNU ext
4607 argp_parse NEW: argp, GNU ext
4608 argp_program_bug_address NEW: argp, GNU ext
4609 argp_program_version NEW: argp, GNU ext
4610 argp_program_version_hook NEW: argp, GNU ext
4611 argp_state_help NEW: argp, GNU ext
4612 argp_usage NEW: argp, GNU ext
4613 authdes_create NEW: Secure RPC
4614 authdes_getucred NEW: Secure RPC
4615 authdes_pk_create NEW: Secure RPC
4616 backtrace NEW: GNU ext.
4617 backtrace_symbols NEW: GNU ext.
4618 backtrace_symbols_fd NEW: GNU ext.
4620 cacosf NEW: ISO C 9x
4621 cacosh NEW: ISO C 9x
4622 cacoshf NEW: ISO C 9x
4623 cacoshl NEW: ISO C 9x
4624 cacosl NEW: ISO C 9x
4631 casinf NEW: ISO C 9x
4632 casinh NEW: ISO C 9x
4633 casinhf NEW: ISO C 9x
4634 casinhl NEW: ISO C 9x
4635 casinl NEW: ISO C 9x
4637 catanf NEW: ISO C 9x
4638 catanh NEW: ISO C 9x
4639 catanhf NEW: ISO C 9x
4640 catanhl NEW: ISO C 9x
4641 catanl NEW: ISO C 9x
4642 cbc_crypt NEW: Secure RPC
4646 ccoshf NEW: ISO C 9x
4647 ccoshl NEW: ISO C 9x
4653 cimagf NEW: ISO C 9x
4654 cimagl NEW: ISO C 9x
4655 clearerr_locked REMOVED
4656 clntunix_create NEW: sunrpc ext
4658 clog10 NEW: ISO C 9x
4659 clog10f NEW: ISO C 9x
4660 clog10l NEW: ISO C 9x
4670 cprojf NEW: ISO C 9x
4671 cprojl NEW: ISO C 9x
4673 crealf NEW: ISO C 9x
4674 creall NEW: ISO C 9x
4679 csinhf NEW: ISO C 9x
4680 csinhl NEW: ISO C 9x
4683 csqrtf NEW: ISO C 9x
4684 csqrtl NEW: ISO C 9x
4688 ctanhf NEW: ISO C 9x
4689 ctanhl NEW: ISO C 9x
4691 des_setparity NEW: Secure RPC
4692 ecb_crypt NEW: Secure RPC
4693 endutxent NEW: Unix98
4695 exp10f NEW: ISO C 9x
4696 exp10l NEW: ISO C 9x
4700 fattach NEW: STREAMS
4701 fdetach NEW: STREAMS
4705 feclearexcept NEW: ISO C 9x
4706 fegetenv NEW: ISO C 9x
4707 fegetexceptflag NEW: ISO C 9x
4708 fegetround NEW: ISO C 9x
4709 feholdexcept NEW: ISO C 9x
4711 feraiseexcept NEW: ISO C 9x
4712 ferror_locked REMOVED
4713 fesetenv NEW: ISO C 9x
4714 fesetexceptflag NEW: ISO C 9x
4715 fesetround NEW: ISO C 9x
4716 fetestexcept NEW: ISO C 9x
4717 feupdateenv NEW: ISO C 9x
4718 fflush_locked REMOVED
4722 fgets_unlocked NEW: GNU ext.
4723 fileno_locked REMOVED
4735 fputc_locked REMOVED
4736 fputs_unlocked NEW: GNU ext.
4737 fread_unlocked NEW: GNU ext.
4742 fstatvfs NEW: Unix98
4746 ftruncate64 NEW: LFS
4748 fwrite_unlocked NEW: GNU ext.
4749 gai_strerror NEW: IPv6
4753 getchar_locked REMOVED
4755 getdate_err NEW: Unix98
4756 getdate_r NEW: GNU ext.
4758 getnameinfo NEW: IPv6
4759 getnetname NEW: Secure RPC
4760 getpmsg NEW: STREAMS
4761 getpt NEW: Unix98 PTY
4762 getrlimit64 NEW: LFS
4763 getutxent NEW: Unix98
4764 getutxid NEW: Unix98
4765 getutxline NEW: Unix98
4766 glob64 NEW: GNU ext.
4767 globfree64 NEW: GNU ext.
4768 gnu_get_libc_release NEW: GNU ext.
4769 gnu_get_libc_version NEW: GNU ext.
4770 grantpt NEW: Unix98 PTY
4771 host2netname NEW: Secure RPC
4773 iconv_close NEW: iconv
4774 iconv_open NEW: iconv
4775 if_freenameindex NEW: IPv6
4776 if_indextoname NEW: IPv6
4777 if_nameindex NEW: IPv6
4778 if_nametoindex NEW: IPv6
4779 in6addr_any NEW: IPv6
4780 in6addr_loopback NEW: IPv6
4781 inet6_isipv4mapped NEW: IPv6
4782 isastream NEW: STREAMS
4783 iswblank NEW: GNU ext.
4784 key_decryptsession NEW: Secure RPC
4785 key_decryptsession_pk NEW: Secure RPC
4786 key_encryptsession NEW: Secure RPC
4787 key_encryptsession_pk NEW: Secure RPC
4788 key_gendes NEW: Secure RPC
4789 key_get_conv NEW: Secure RPC
4790 key_secretkey_is_set NEW: Secure RPC
4791 key_setnet NEW: Secure RPC
4792 key_setsecret NEW: Secure RPC
4793 llrint NEW: ISO C 9x
4794 llrintf NEW: ISO C 9x
4795 llrintl NEW: ISO C 9x
4796 llround NEW: ISO C 9x
4797 llroundf NEW: ISO C 9x
4798 llroundl NEW: ISO C 9x
4803 lrintf NEW: ISO C 9x
4804 lrintl NEW: ISO C 9x
4805 lround NEW: ISO C 9x
4806 lroundf NEW: ISO C 9x
4807 lroundl NEW: ISO C 9x
4809 makecontext NEW: Unix98
4810 mempcpy NEW: GNU ext.
4813 modify_ldt NEW: kernel
4817 nearbyint NEW: ISO C 9x
4818 nearbyintf NEW: ISO C 9x
4819 nearbyintl NEW: ISO C 9x
4820 netname2host NEW: Secure RPC
4821 netname2user NEW: Secure RPC
4822 nexttoward NEW: ISO C 9x
4823 nexttowardf NEW: ISO C 9x
4824 nexttowardl NEW: ISO C 9x
4828 passwd2des NEW: Secure RPC
4830 pow10f NEW: GNU ext.
4831 pow10l NEW: GNU ext.
4834 printf_size NEW: GNU ext.
4835 printf_size_info NEW: GNU ext.
4836 profil_counter REMOVED
4837 pthread_mutexattr_getkind_np REPLACED
4838 pthread_mutexattr_setkind_np REPLACED
4839 ptsname NEW: Unix98 PTY
4840 ptsname_r NEW: Unix98 PTY
4842 putchar_locked REMOVED
4843 putgrent NEW: GNU ext.
4845 putpmsg NEW: STREAMS
4846 pututxline NEW: Unix98
4850 readdir64_r NEW: LFS
4851 remquo NEW: ISO C 9x
4852 remquof NEW: ISO C 9x
4853 remquol NEW: ISO C 9x
4855 roundf NEW: ISO C 9x
4856 roundl NEW: ISO C 9x
4858 scalbln NEW: ISO C 9x
4859 scalblnf NEW: ISO C 9x
4860 scalblnl NEW: ISO C 9x
4862 sendfile NEW: kernel
4863 setcontext NEW: Unix98
4864 setrlimit64 NEW: LFS
4865 setutxent NEW: Unix98
4867 sigignore NEW: Unix98
4868 sigqueue NEW: POSIX.1b
4869 sigrelse NEW: Unix98
4870 sigset NEW: POSIX.1b
4871 sigtimedwait NEW: POSIX.1b
4872 sigwaitinfo NEW: POSIX.1b
4873 sincos NEW: GNU ext.
4874 sincosf NEW: GNU ext.
4875 sincosl NEW: GNU ext.
4879 strcasestr NEW: GNU ext.
4880 strtoimax NEW: ISO C 9x
4881 strtoumax NEW: ISO C 9x
4882 strverscmp NEW: GNU ext.
4883 svcauthdes_stats NEW: Secure RPC
4884 svcunix_create NEW: sunrpc etx
4885 svcunixfd_create NEW: sunrpc ext
4886 swapcontext NEW: Unix98
4887 tcgetsid NEW: Unix98 PTY
4888 tdestroy NEW: GNU ext.
4889 tgamma NEW: ISO C 9x
4890 tgammaf NEW: ISO C 9x
4891 tgammal NEW: ISO C 9x
4895 truncf NEW: ISO C 9x
4896 truncl NEW: ISO C 9x
4898 unlockpt NEW: Unix98 PTY
4899 updwtmpx NEW: Unix98
4900 user2netname NEW: Secure RPC
4901 utmpxname NEW: Unix98
4902 versionsort NEW: GNU ext.
4903 versionsort64 NEW: GNU ext.
4905 wcscasecmp NEW: GNU ext.
4906 wcsncasecmp NEW: GNU ext.
4907 wcsnlen NEW: GNU ext.
4908 wcstoimax NEW: ISO C 9x
4909 wcstoll NEW: ISO C 9x
4910 wcstoull NEW: ISO C 9x
4911 wcstoumax NEW: ISO C 9x
4913 wordexp NEW: POSIX.2
4914 wordfree NEW: POSIX.2
4915 write_profiling REMOVED
4916 xdecrypt NEW: Secure RPC
4917 xdr_authdes_cred NEW: Secure RPC
4918 xdr_authdes_verf NEW: Secure RPC
4919 xdr_cryptkeyarg NEW: Secure RPC
4920 xdr_cryptkeyarg2 NEW: Secure RPC
4921 xdr_cryptkeyres NEW: Secure RPC
4922 xdr_getcredres NEW: Secure RPC
4923 xdr_key_netstarg NEW: Secure RPC
4924 xdr_key_netstres NEW: Secure RPC
4925 xdr_keybuf NEW: Secure RPC
4926 xdr_keystatus NEW: Secure RPC
4927 xdr_netnamestr NEW: Secure RPC
4928 xdr_sizeof NEW: Secure RPC
4929 xdr_unixcred NEW: sunrpc ext
4930 xencrypt NEW: Secure RPC
4931 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4942 * inet_ntoa is thread-safe
4944 * updwtmp is moved from libutil to libc
4946 * rewrite of cbrt function
4948 * update of timezone data
4962 * add atoll function
4964 * fix complex problems in Berkeley DB code
4966 * fix math functions
4970 * fixed lots of header problems (especially Linux/GNU specific)
4972 * dynamic loader preserves all registers
4974 * Roland McGrath provided support for handling of auxiliary objects in
4975 the ELF dynamic loader.
4977 * support for parallel builds is improved
4981 * GNU extensions are no longer declared by default. To enable them you
4982 must define the macro `_GNU_SOURCE' in your program or compile with
4985 * The library has changed from using GNU ld symbol aliases to using weak
4986 symbols where available. The ELF object file format supports weak
4987 symbols; GNU ld also supports weak symbols in the a.out format. (There
4988 is also now support for other GNU ld extensions in ELF. Use the
4989 `--with-elf' option to configure to indicate you have ELF, and
4990 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
4991 of many files which contained only symbol aliases, reducing the size of
4992 the source and the compiled library; many other files were renamed to
4993 less cryptic names previously occupied by the symbol alias files.
4994 There is a new header file <elf.h> for programs which operate on
4995 files in the ELF format.
4997 * Converted to Autoconf version 2, so `configure' has more options.
4998 Run `configure --help' to see the details.
5000 * The library can now be configured to build profiling, highly-optimized
5001 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
5002 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
5003 `configure' enable building these extra libraries. The shared library is
5004 built by default when using both ELF and GNU ld. When shared libraries
5005 are enabled, the new library `-ldl' is available for arbitrary run-time
5006 loading of shared objects; its interface is defined in <dlfcn.h>. The
5007 new header file <link.h> gives access to the internals of the run-time
5008 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
5009 application of same name on other systems and it provides information
5010 about dynamically linked binaries.
5012 * The C library now provides the run-time support code for profiling
5013 executables compiled with `-pg'. Programs can control the profiling code
5014 through the interface in <sys/gmon.h>. The `gmon.out' files written by
5015 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
5016 the support for this file format was contributed by David Mosberger-Tang.
5018 * The math code has been replaced with a math library based on fdlibm from
5019 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
5020 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
5021 functions. The math functions now reside in a separate library, so
5022 programs using them will need to use `-lm' their linking commands.
5024 * John C. Bowman contributed optimized ix87 assembler inline functions.
5026 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
5027 mechanism similar to that found in Solaris 2. This is now used for the
5028 group, passwd, hosts, networks, services, protocols, rpc, ethers,
5029 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
5030 file controls what services are used for each individual database. This
5031 works by loading shared libraries with names specified in `nsswitch.conf',
5032 so service modules can be changed or added at any time without even
5033 relinking any program. Currently there are the file, db, and NIS based
5034 NSS services available.
5036 * The new functions `strtoq' and `strtouq' parse integer values from
5037 strings, like `strtol' and `strtoul', but they return `long long int' and
5038 `unsigned long long int' values, respectively (64-bit quantities).
5040 * The new functions `strtof' and `strtold' parse floating-point values from
5041 strings, like `strtod', but they return `float' and `long double' values,
5042 respectively (on some machines `double' and `long double' are the same).
5044 * Ulrich Drepper has contributed new implementations of the floating-point
5045 printing and reading code used in the `printf' family of functions and
5046 `strtod', `strtof', and `strtold'. These new functions are perfectly
5047 accurate, and much faster than the old ones.
5049 * The implementation of the POSIX locale model was completely rewritten by
5050 Ulrich Drepper. This includes the new programs `localedef' and `locale'
5051 to compile the POSIX locale definition.
5053 * The former dummy implementations of the strcoll and strxfrm function are
5054 now replaced by fully functional code contributed by Ulrich Drepper. The
5055 collation information comes from the POSIX locale definitions.
5057 * The new header <langinfo.h> defines an interface for accessing
5058 various locale-dependent data (using the locale chosen with `setlocale').
5060 * Ulrich Drepper has contributed a new suite of functions for operation on
5061 wide-character and multibyte-character strings, in <wchar.h>;
5062 and classification and case conversion of wide characters, in <wctype.h>.
5063 These new functions are conforming to the ISO C, Amendement 1 specification.
5065 * There is now a second implementation of the standard I/O library available.
5066 It comes from GNU libg++ as was written by Per Bothner, heavily modified
5067 by Hongjiu Lu and made thread safe by Ulrich Drepper.
5069 * You can now use positional parameter specifications in format strings
5070 for the `printf' and `scanf' families of functions. For example,
5071 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5072 ``Number 6, Mr Jones''. This is mainly useful when providing different
5073 format strings for different languages, whose grammars may dictate
5074 different orderings of the values being printed. To support this
5075 feature, the interface for `register_printf_handler' has changed; see
5076 the header file <printf.h> for details.
5078 * The `printf' and `scanf' families of functions now understand a new
5079 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5080 to group numbers as indicated by the locale; for `scanf' and friends, this
5081 says to accept as valid only a number with all the proper grouping
5082 separators in the right places. In the default "C" locale, numbers are
5083 not grouped; but locales for specific countries will define the usual
5084 conventions (i.e. separate thousands with `,' in the US locale).
5086 * The pgrp functions have been regularized, slightly incompatibly but much
5087 less confusingly. The core functions are now `getpgid' and `setpgid',
5088 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5089 argument) and BSD `setpgrp' (identical to `setpgid') functions are
5090 provided for compatibility. There is no longer an incompatible `getpgrp'
5091 with an argument declared under _BSD_SOURCE; no BSD code uses it.
5093 * The new header file <fts.h> and suite of functions simplify programs that
5094 operate on directory trees. This code comes from 4.4 BSD.
5096 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5097 Parts of the code were heavily modified by Ulrich Drepper to fit in the
5098 NSS scheme used in glibc.
5100 * There is a new malloc debugging hook `__memalign_hook'.
5102 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5103 `unsigned int' in <sys/types.h>. These are for compatibility only and
5104 their use is discouraged.
5106 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5107 done differently, so that it works even without GNU ld.
5109 * New function `euidaccess' checks allowed access to a file like `access',
5110 but using the effective IDs instead of the real IDs.
5112 * The time zone data files have been updated for the latest and greatest
5113 local time conventions of the countries of the world.
5115 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5118 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5119 for formatting floating-point numbers. They are provided only for
5120 compatibility; new programs should use `sprintf' instead. There are
5121 also equivalent function for the `long double' floating-point type and
5122 all functions also exist in a reentrant form.
5124 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5125 functions for maintaining the login-record files (primarily of use to
5126 system programs such as `login'), and convenient functions for
5127 allocating and initializing a pseudo-terminal (pty) device.
5129 * Ulrich Drepper has contributed new support for System V style
5130 shared memory and IPC on systems that support it.
5132 * Ulrich Drepper has contributed several miscellaneous new functions found
5133 in System V: The `hsearch' family of functions provide an effective
5134 implementation of hash tables; `a64l' and `l64a' provide a very simple
5135 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5138 * Ulrich Drepper has contributed new reentrant counterparts for the
5139 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5141 * Ulrich Drepper has contributed new, highly-optimized versions of several
5142 string functions for the i486/Pentium family of processors.
5144 * Ulrich Drepper has updated the Linux-specific code, based largely
5145 on work done in Hongjiu Lu's version of GNU libc for Linux.
5146 The GNU library now supports Linux versions 2.0.10 and later,
5147 using the ELF object file format (i[3456]86-*-linux).
5149 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5151 * David Mosberger-Tang and Richard Henderson have ported the C library
5152 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
5153 dynamic linking support for ELF/Alpha.
5155 * Richard Henderson contributed several Alpha optimized assembler function
5156 for arithmetic and string handling.
5158 * Ulrich Drepper has contributed a new set of message catalog functions to
5159 support multiple languages using the <libintl.h> interface, for use with
5160 his new package GNU gettext. Translation volunteers have contributed
5161 catalogs of the library's messages in Spanish, German, and Korean.
5163 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5164 program and the `catgets' function for reading the catalog files it
5165 creates. (The <libintl.h> interface is preferred; we include the
5166 <nl_types.h> interface using `catgets' only for source compatibility with
5167 programs already written to use it.)
5169 * New header file <values.h> gives SVID-compatible names for <limits.h>
5172 * Various new macros, declarations, and small header files for compatibility
5175 * New function `group_member' is a convenient way to check if a process has
5176 a given effective group ID.
5178 * When using GCC 2.7 and later, the socket functions are now declared in a
5179 special way so that passing an argument of type `struct sockaddr_in *',
5180 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5181 `struct sockaddr *' type, does not generate a type-clash warning.
5183 * New function `error' declared in header file <error.h> is a convenient
5184 function for printing error messages and optionally exiting; this is the
5185 canonical function used in GNU programs. The new functions `err', `warn',
5186 and friends in header file <err.h> are the canonical 4.4 BSD interface for
5187 doing the same thing.
5189 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5190 POSIX.2 `glob' function to do ~ and {...} expansion.
5192 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5193 `clearenv' which is used in POSIX.9 is also available.
5195 * New function `getsid' returns session ID number on systems that support it.
5197 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
5198 files <db.h> and <mpool.h> provide a rich set of functions for several
5199 types of simple databases stored in memory and in files, and <ndbm.h> is
5200 an old `ndbm'-compatible interface using the `db' functions. Link with
5201 `-ldb' to get these functions.
5203 * New macro `strdupa' copies a string like `strdup', but uses local stack
5204 space from `alloca' instead of dynamic heap space from `malloc'.
5206 * New function `strnlen' is like `strlen' but searches only a given maximum
5207 number of characters for the null terminator. `stpncpy', `strndup' and
5208 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5211 * New function `statfs' in header <sys/statfs.h>.
5213 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5214 provide convenient functions for operating on blocks of null-terminated
5217 * A new suite of functions in <utmp.h> handle all the details of reading
5218 and writing the utmp file.
5220 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5223 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5224 completely POSIX compliant and also implemented the extended functionality
5225 to handle alternate digit representation and alternate era date formats.
5227 * Ulrich Drepper provided an implementation of the `strptime' function
5228 defined in XPG4.2 which transforms a string into a `struct tm' value.
5230 * Paul Eggert provided the tzselect shell script as part of the timezone
5231 code. The shell script makes it easy to select the correct timezone
5234 * The implementation of the malloc family of functions is completely replaced
5235 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5236 The implementation uses the mmap function (if available) and it is
5237 optimized for the use in multi threaded programs.
5239 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5240 functions. This new functionality is usable by specifying a special
5241 salt string and it is compatible with implementation on *BSD systems.
5243 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5244 `getsubopt' to handle second level command line options, `bsd_signal'
5245 to access BSD style `signal' functionality, the obsolete `regexp' style
5248 * the `lchown' function is available on system which support this
5251 * The implementation of the shadow password handling function was contributed
5254 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5256 * POSIX.1g support was added. The <sys/select.h> header is available,
5257 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
5258 implementation of `getaddrinfo'.
5262 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5264 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5265 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
5267 * The new function `daemon' from 4.4 BSD is useful for server programs that
5268 want to put themselves in the background.
5270 * Joel Sherrill has contributed support for several standalone boards that
5271 run without an operating system.
5273 * `printf', `scanf' and friends now accept a `q' type modifier for long
5274 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
5276 * All of the code taken from BSD (notably most of the math and networking
5277 routines) has been updated from the BSD 4.4-Lite release.
5279 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
5281 * The new functions `getdomainname' and `setdomainname' fetch or change the
5282 YP/NIS domain name. These are system calls which exist on systems which
5285 * The time zone data files have been updated for the latest international
5288 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
5289 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
5293 * The C library now includes support for Sun RPC, from Sun's free
5294 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
5295 are included. (There is still no support for YP.)
5297 * Tom Quinn has contributed a port of the C library to SGI machines running
5298 Irix 4 (mips-sgi-irix4).
5300 * The new `lockf' function is a simplified interface to the locking
5301 facilities of `fcntl', included for compatibility.
5303 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
5305 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
5307 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
5310 * The error message printed by `assert' for a failed assertion now includes
5311 the name of the program (if using GNU ld) and the name of the calling
5312 function (with versions of GCC that support this).
5314 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
5316 * The library now includes the <sys/mman.h> header file and memory
5317 management functions `mmap', `munmap', `mprotect', `msync', and
5318 `madvise', on systems that support those facilities.
5320 * The interface for `mcheck' has changed slightly: the function called to
5321 abort the program when an allocation inconsistency is detected now takes
5322 an argument that indicates the type of failure. The new function
5323 `mprobe' lets you request a consistency check for a particular block at
5324 any time (checks are normally done only when you call `free' or `realloc'
5327 * It is now possible to easily cross-compile the C library, building on one
5328 system a library to run on another machine and/or operating system. All
5329 you need to do is set the variable `HOST_CC' in `configparms' to the
5330 native compiler for programs to run on the machine you are building on (a
5331 few generator programs are used on Unix systems); set `CC' to the
5334 * The new function `fexecve' (only implemented on the GNU system) executes
5335 a program file given a file descriptor already open on the file.
5339 * Brendan Kehoe has contributed most of a port to the DEC Alpha
5340 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
5342 * You can set the variable `libprefix' in `configparms' to specify a prefix
5343 to be prepended to installed library files; this makes it easy to install
5344 the GNU C library to be linked as `-lgnuc' or whatever.
5346 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
5347 copies a limited number of characters from a string, and returns the
5348 address of the last character written.
5350 * You no longer need to check for whether the installed `stddef.h' is
5351 compatible with the GNU C library. configure now checks for you.
5353 * You can now define a per-stream `fileno' function to convert the
5354 stream's cookie into an integral file descriptor.
5356 * ``malloc (0)'' no longer returns a null pointer. Instead, it
5357 allocates zero bytes of storage, and returns a unique pointer which
5358 you can pass to `realloc' or `free'. The behavior is undefined if
5359 you dereference this pointer.
5361 * The C library now runs on Sony NEWS m68k machines running either
5362 NewsOS 3 or NewsOS 4.
5364 * The new `syscall' function is a system-dependent primitive function
5365 for invoking system calls. It has the canonical behavior on Unix
5366 systems, including unreliable return values for some calls (such as
5367 `pipe', `fork' and `getppid').
5369 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
5370 to `EAGAIN', which is the preferred name. On systems whose kernels
5371 use two distinct codes, the C library now translates EWOULDBLOCK to
5372 EAGAIN in every system call function.
5376 * The GNU C Library Reference Manual is now distributed with the library.
5377 `make dvi' will produce a DVI file of the printed manual.
5378 `make info' will produce Info files that you can read on line using C-h i
5379 in Emacs or the `info' program.
5380 Please send comments on the manual to bug-glibc-manual@gnu.org.
5382 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
5384 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
5386 * Jason Merrill has contributed a port to the Sequent Symmetry running
5387 Dynix version 3 (i386-sequent-dynix).
5389 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
5390 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
5392 * New function `memory_warnings' lets you arrange to get warnings when
5393 malloc is running out of memory to allocate, like Emacs gives you.
5395 * The C library now contains the relocating allocator used in Emacs 19 for
5396 its editing buffers. This allocator (ralloc) minimizes allocation
5397 overhead and fragmentation by moving allocated regions around whenever it
5398 needs to. You always refer to a ralloc'd region with a "handle" (a
5399 pointer to a pointer--an object of type `void **').
5401 * There is a new `printf' format: `%m' gives you the string corresponding
5402 to the error code in `errno'.
5404 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
5405 or `%[' conversion, but instead of filling in a fixed-sized buffer you
5406 pass, the `a' modifier says to fill in a `char **' you pass with a
5409 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
5410 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
5411 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
5413 * `mkstemp' is a traditional Unix function to atomically create and open a
5414 uniquely-named temporary file.
5418 * The standard location for the file that says what the local timezone is
5419 has changed again. It is now `/usr/local/etc/localtime' (or more
5420 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
5422 * The distribution no longer contains any files with names longer than 14
5425 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
5426 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
5428 * New functions `ttyslot' and `syslog' from 4.4 BSD.
5432 * The configuration process has changed quite a bit. The `configure'
5433 script is now used just like the configuration scripts for other GNU
5434 packages. The `sysdeps' directory hierarchy is much rearranged.
5435 The file `INSTALL' explains the new scheme in detail.
5437 * The header files no longer need to be processed into ANSI C and
5438 traditional C versions. There is just one set of files to install, and
5439 it will work with ANSI or old C compilers (including `gcc -traditional').
5441 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
5442 MIPS DECStation running Ultrix 4.
5444 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
5445 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
5446 made itself into a shared library.
5448 * Yet further improved support for the i386, running 4.3 BSD-like systems
5449 (such as Mach 3 with the Unix single-server), or System V.
5451 * New function `strncasecmp' to do case-insensitive string comparison
5452 with limited length.
5454 * New function `strsep' is a reentrant alternative to `strtok'.
5456 * New functions `scandir' and `alphasort' for searching directories.
5458 * New function `setenv' is a better interface to `putenv'.
5460 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
5461 function for traversing a directory tree.
5463 * The GNU obstack package is now also part of the C library.
5464 The new function `open_obstack_stream' creates a stdio stream that
5465 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
5466 formatted output directly to an obstack.
5468 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
5469 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
5471 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
5473 * The new functions `strfry' and `memfrob' do mysterious and wonderful
5474 things to your strings.
5476 * There are some new test programs: test-fseek, testmb, and testrand.
5478 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
5479 These ports are not finished, but are a good starting place for really
5480 supporting those systems.
5482 * `/etc/localtime' is now the standard location for the file that says what
5483 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
5484 This follows the general principle that `/etc' is the place for all local
5485 configuration files.
5487 * The C library header files now use `extern "C"' when used by the C++
5488 compiler, so the C library should now work with C++ code.
5490 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
5491 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
5494 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
5495 function which uses the `merge sort' algorithm, and is said to be
5496 significantly faster than the old GNU `qsort' function. Merge sort is
5497 now the standard `qsort' function. The new algorithm can require a lot
5498 of temporary storage; so, the old sorting function is called when the
5499 required storage is not available.
5501 * The C library now includes Michael Glad's Ultra Fast Crypt, which
5502 provides the Unix `crypt' function, plus some other entry points.
5504 * The code and header files taken from 4.4 BSD have been updated with the
5505 latest files released from Berkeley.
5507 ----------------------------------------------------------------------
5508 Copyright information:
5510 Copyright (C) 1992-2019 Free Software Foundation, Inc.
5512 Permission is granted to anyone to make or distribute verbatim copies
5513 of this document as received, in any medium, provided that the
5514 copyright notice and this permission notice are preserved,
5515 thus giving the recipient permission to redistribute in turn.
5517 Permission is granted to distribute modified versions
5518 of this document, or of portions of it,
5519 under the above conditions, provided also that they
5520 carry prominent notices stating who last changed them.
5523 version-control: never