1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2021 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Unicode 14.0.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 14.0.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * Bump r_version in the debugger interface to 2 and add a new field,
17 r_next, support multiple namespaces.
19 * Support for the C.UTF-8 locale has been added to glibc. The locale
20 supports full code-point sorting for all valid Unicode code points. A
21 limitation in the framework for fnmatch, regexec, and regcomp requires
22 a compromise to save space and only ASCII-based range expressions are
23 supported for now (see bug 28255). The full size of the locale is
24 only ~400KiB, with 346KiB coming from LC_CTYPE information for
25 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
26 in various downstream distributions. The locale is not built into
27 glibc, and must be installed.
29 * <math.h> functions that round their results to a narrower type, and
30 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
31 18661-3:2015 and draft ISO C2X:
33 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
34 fMxsqrtfN and fMxsqrtfNx functions.
36 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
39 * <math.h> functions for floating-point maximum and minimum,
40 corresponding to new operations in IEEE 754-2019, and corresponding
41 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
42 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
43 fminimum_mag, fminimum_mag_num and corresponding functions for float,
44 long double, _FloatN and _FloatNx.
46 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
47 predefined as specified in TS 18661-1:2014.
49 * The exp10 functions in <math.h> now have a corresponding type-generic
52 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
54 * A new DSO sorting algorithm has been added in the dynamic linker that uses
55 topological sorting by depth-first search (DFS), solving performance issues
56 of the existing sorting algorithm when encountering particular circular
57 object dependency cases.
59 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between the two
60 DSO sorting algorithms. The default setting of '1' uses the current existing
61 algorithm, while a value of '2' selects the new DFS-based algorithm.
63 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
64 to be used by compilers for optimizing usage of 'memcmp' when its
65 return value is only used for its boolean status.
67 Deprecated and removed features, and other changes affecting compatibility:
69 * The r_version update in the debugger interface makes the glibc binary
70 incompatible with GDB binaries built without the following commits:
72 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
73 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
75 when audit modules or dlmopen are used.
77 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
79 Changes to build and runtime requirements:
81 [Add changes to build and runtime requirements here]
83 Security related changes:
85 [Add security related changes here]
87 The following bugs are resolved with this release:
89 [The release manager will add the list generated by
90 scripts/list-fixed-bugs.py just before the release.]
97 * In order to support smoother in-place-upgrades and to simplify
98 the implementation of the runtime all functionality formerly
99 implemented in the libraries libpthread, libdl, libutil, libanl has
100 been integrated into libc. New applications do not need to link with
101 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
102 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
103 provided, so that the linker options keep working. Applications which
104 have been linked against glibc 2.33 or earlier continue to load the
105 corresponding shared objects (which are now empty). The integration
106 of those libraries into libc means that additional symbols become
107 available by default. This can cause applications that contain weak
108 references to take unexpected code paths that would only have been
109 used in previous glibc versions when e.g. preloading libpthread.so.0,
110 potentially exposing application bugs.
112 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
113 PTHREAD_STACK_MIN is no longer constant and is redefined to
114 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
115 sets for modern architectural features like Arm SVE.
117 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
118 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
119 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
120 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
121 dynamic sized register sets for modern architectural features like
124 * The dynamic linker implements the --list-diagnostics option, printing
125 a dump of information related to IFUNC resolver operation and
126 glibc-hwcaps subdirectory selection.
128 * On Linux, the function execveat has been added. It operates similar to
129 execve and it is is already used to implement fexecve without requiring
130 /proc to be mounted. However, different than fexecve, if the syscall is not
131 supported by the kernel an error is returned instead of trying a fallback.
133 * The ISO C2X function timespec_getres has been added.
135 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
136 C2X, is supported to enable declarations of functions defined in Annex F
137 of C2X. Those declarations are also enabled when
138 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
139 defined, and when _GNU_SOURCE is defined.
141 * On powerpc64*, glibc can now be compiled without scv support using the
142 --disable-scv configure option.
144 * Add support for 64-bit time_t on configurations like x86 where time_t
145 is traditionally 32-bit. Although time_t still defaults to 32-bit on
146 these configurations, this default may change in future versions.
147 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
148 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
149 only enabled for Linux and the full support requires a minimum kernel
152 * The main gconv-modules file in glibc now contains only a small set of
153 essential converter modules and the rest have been moved into a supplementary
154 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
155 in the same GCONV_PATH. Similarly, external converter modules directories
156 may have supplementary configuration files in a gconv-modules.d directory
157 with names ending with .conf to logically classify the converter modules in
160 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
161 to configure the size of the thread stack cache.
163 * The function _Fork has been added as an async-signal-safe fork replacement
164 since Austin Group issue 62 droped the async-signal-safe requirement for
165 fork (and it will be included in the future POSIX standard). The new _Fork
166 function does not run any atfork function neither resets any internal state
167 or lock (such as the malloc one), and only sets up a minimal state required
168 to call async-signal-safe functions (such as raise or execve). This function
169 is currently a GNU extension.
171 * On Linux, the close_range function has been added. It allows efficiently
172 closing a range of file descriptors on recent kernels (version 5.9).
174 * The function closefrom has been added. It closes all file descriptors
175 greater than or equal to a given integer. This function is a GNU extension,
176 although it is also present in other systems.
178 * The posix_spawn_file_actions_addclosefrom_np function has been added,
179 enabling posix_spawn and posix_spawnp to close all file descriptors greater
180 than or equal to a given integer. This function is a GNU extension,
181 although Solaris also provides a similar function.
183 Deprecated and removed features, and other changes affecting compatibility:
185 * The function pthread_mutex_consistent_np has been deprecated; programs
186 should use the equivalent standard function pthread_mutex_consistent
189 * The function pthread_mutexattr_getrobust_np has been deprecated;
190 programs should use the equivalent standard function
191 pthread_mutexattr_getrobust instead.
193 * The function pthread_mutexattr_setrobust_np has been deprecated;
194 programs should use the equivalent standard function
195 pthread_mutexattr_setrobust instead.
197 * The function pthread_yield has been deprecated; programs should use
198 the equivalent standard function sched_yield instead.
200 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
202 * Various rarely-used functions declared in <resolv.h> and
203 <arpa/nameser.h> have been deprecated. Applications are encouraged to
204 use dedicated DNS processing libraries if applicable. For <resolv.h>,
205 this affects the functions dn_count_labels, fp_nquery, fp_query,
206 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
207 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
208 p_type, putlong, putshort, res_hostalias, res_isourserver,
209 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
210 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
211 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
212 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
214 * Various symbols previously defined in libresolv have been moved to libc
215 in order to prepare for libresolv moving entirely into libc (see earlier
216 entry for merging libraries into libc). The symbols __dn_comp,
217 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
218 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
219 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
220 __res_search, __res_send formerly in libresolv have been renamed and no
221 longer have a __ prefix. They are now available in libc.
223 * The pthread cancellation handler is now installed with SA_RESTART and
224 pthread_cancel will always send the internal SIGCANCEL on a cancellation
225 request. It should not be visible to applications since the cancellation
226 handler should either act upon cancellation (if asynchronous cancellation
227 is enabled) or ignore the cancellation internal signal. However there are
228 buggy kernel interfaces (for instance some CIFS versions) that could still
229 see a spurious EINTR error when cancellation interrupts a blocking syscall.
231 * Previously, glibc installed its various shared objects under versioned
232 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
233 were provided as symbolic links. Starting with glibc 2.34, the shared
234 objects are installed under their ABI sonames directly, without
235 symbolic links. This increases compatibility with distribution
236 package managers that delete removed files late during the package
237 upgrade or downgrade process.
239 * The symbols mallwatch and tr_break are now deprecated and no longer used in
240 mtrace. Similar functionality can be achieved by using conditional
241 breakpoints within mtrace functions from within gdb.
243 * The __morecore and __after_morecore_hook malloc hooks and the default
244 implementation __default_morecore have been removed from the API. Existing
245 applications will continue to link against these symbols but the interfaces
246 no longer have any effect on malloc.
248 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
249 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
250 disabled by default in the main C library. Users looking to use these
251 features now need to preload a new debugging DSO libc_malloc_debug.so to get
252 this functionality back.
254 * The deprecated functions malloc_get_state and malloc_set_state have been
255 moved from the core C library into libc_malloc_debug.so. Legacy applications
256 that still use these functions will now need to preload libc_malloc_debug.so
257 in their environment using the LD_PRELOAD environment variable.
259 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
260 __memalign_hook and __free_hook are now removed from the API. Compatibility
261 symbols are present to support legacy programs but new applications can no
262 longer link to these symbols. These hooks no longer have any effect on glibc
263 functionality. The malloc debugging DSO libc_malloc_debug.so currently
264 supports hooks and can be preloaded to get this functionality back for older
265 programs. However this is a transitional measure and may be removed in a
266 future release of the GNU C Library. Users may port away from these hooks by
267 writing and preloading their own malloc interposition library.
269 Changes to build and runtime requirements:
271 * On Linux, the shm_open, sem_open, and related functions now expect the
272 file shared memory file system to be mounted at /dev/shm. These functions
273 no longer search among the system's mount points for a suitable
274 replacement if /dev/shm is not available.
276 Security related changes:
278 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
279 a request for netgroup lookup, may crash due to a double-free,
280 potentially resulting in degraded service or Denial of Service on the
281 local system. Reported by Chris Schanzle.
283 CVE-2021-33574: The mq_notify function has a potential use-after-free
284 issue when using a notification type of SIGEV_THREAD and a thread
285 attribute with a non-default affinity mask.
287 CVE-2021-35942: The wordexp function may overflow the positional
288 parameter number when processing the expansion resulting in a crash.
289 Reported by Philippe Antoine.
291 The following bugs are resolved with this release:
293 [4737] libc: fork is not async-signal-safe
294 [5781] math: Slow dbl-64 sin/cos/sincos for special values
295 [10353] libc: Methods for deleting all file descriptors greater than
296 given integer (closefrom)
297 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
298 name containing multi-byte character(s)
299 [14469] math: Inaccurate j0f function
300 [14470] math: Inaccurate j1f function
301 [14471] math: Inaccurate y0f function
302 [14472] math: Inaccurate y1f function
303 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
305 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
306 crashes if it fails dlsym() twice
307 [15648] nptl: multiple definition of `__lll_lock_wait_private'
308 [16063] nptl: Provide a pthread_once variant in libc directly
309 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
310 [17145] libc: syslog with LOG_CONS leaks console file descriptor
311 [17183] manual: description of ENTRY struct in <search.h> in glibc
313 [18435] nptl: pthread_once hangs when init routine throws an exception
314 [18524] nptl: Missing calloc error checking in
315 __cxa_thread_atexit_impl
316 [19329] dynamic-link: dl-tls.c assert failure at concurrent
317 pthread_create and dlopen
318 [19366] nptl: returning from a thread should disable cancellation
319 [19511] nptl: 8MB memory leak in pthread_create in case of failure
320 when non-root user changes priority
321 [20802] dynamic-link: getauxval NULL pointer dereference after static
323 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
324 [22057] malloc: malloc_usable_size is broken with mcheck
325 [22668] locale: LC_COLLATE: the last character of ellipsis is not
327 [23323] libc: [RFE] CSU startup hardening.
328 [23328] malloc: Remove malloc hooks and ensure related APIs return no
330 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
331 $PLATFORM, $ORIGIN) crashes
332 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
333 [23554] nptl: pthread_getattr_np reports wrong stack size with
335 [24106] libc: Bash interpreter in ldd script is taken from host
336 [24773] dynamic-link: dlerror in an secondary namespace does not use
337 the right free implementation
338 [25036] localedata: Update collation order for Swedish
339 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
340 shm_open to pick wrong directory
341 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
342 crash in IFUNC resolver due to stack canary (--enable-stack-
344 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
345 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
346 [27111] dynamic-link: pthread_create and tls access use link_map
347 objects that may be concurrently freed by dlclose
348 [27132] malloc: memusagestat is linked to system librt, leading to
349 undefined symbols on major version upgrade
350 [27136] dynamic-link: dtv setup at thread creation may leave an entry
352 [27249] libc: libSegFault.so does not output signal number properly
353 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
355 [27318] dynamic-link: glibc fails to load binaries when built with
356 -march=sandybridge: CPU ISA level is lower than required
357 [27343] nss: initgroups() SIGSEGVs when called on a system without
358 nsswich.conf (in a chroot)
359 [27346] dynamic-link: x86: PTWRITE feature check is missing
360 [27389] network: NSS chroot hardening causes regressions in chroot
362 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
363 [27444] libc: sysconf reports unsupported option (-1) for
364 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
365 [27462] nscd: double-free in nscd (CVE-2021-27645)
366 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
367 malloc/tst-malloc-thread-fail
368 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
369 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
371 [27522] glob: glob, glob64 incorrectly marked as __THROW
372 [27555] dynamic-link: Static tests fail with --enable-stack-
374 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
375 information for the current directory
376 [27577] dynamic-link: elf/ld.so --help doesn't work
377 [27605] libc: tunables can't control xsave/xsavec selection in
379 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
380 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
382 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
383 _nss_files_getcanonname_r) from within a dlmopen namespace.
384 [27648] libc: FAIL: misc/tst-select
385 [27650] stdio: vfscanf returns too early if a match is longer than
387 [27651] libc: Performance regression after updating to 2.33
388 [27655] string: Wrong size calculation in string/test-strnlen.c
389 [27706] libc: select fails to update timeout on error
390 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
391 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
392 tries resolving them lazily
393 [27744] nptl: Support different libpthread/ld.so load orders in
395 [27749] libc: Data race __run_exit_handlers
396 [27761] libc: getconf: Segmentation fault when passing '-vq' as
398 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
399 exceeds maximum object size 2147483647
400 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
402 [27872] build: Obsolete configure option --enable-stackguard-
404 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
405 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
406 [27892] libc: powerpc: scv ABI error handling fails to check
408 [27896] nptl: mq_notify does not handle separately allocated thread
409 attributes (CVE-2021-33574)
410 [27901] libc: TEST_STACK_ALIGN doesn't work
411 [27902] libc: The x86-64 clone wrapper fails to align child stack
412 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
413 [27939] libc: aarch64: clone does not align the stack
414 [27968] libc: s390x: clone does not align the stack
415 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
416 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
418 [28028] malloc: malloc: tcache shutdown sequence does not work if the
419 thread never allocated anything
420 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
421 [28064] string: x86_64:wcslen implementation list has wcsnlen
422 [28067] libc: FAIL: posix/tst-spawn5
423 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
424 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
426 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
427 [28089] build: tst-tls20 fails when linker defaults to --as-needed
428 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
430 [28091] network: ns_name_skip may return 0 for domain names without
438 * The dynamic linker accepts the --list-tunables argument which prints
439 all the supported tunables. This option is disable if glibc is
440 configured with tunables disabled (--enable-tunables=no).
442 * The dynamic linker accepts the --argv0 argument and provides opportunity
443 to change argv[0] string.
445 * The dynamic linker loads optimized implementations of shared objects
446 from subdirectories under the glibc-hwcaps directory on the library
447 search path if the system's capabilities meet the requirements for
448 that subdirectory. Initially supported subdirectories include
449 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
450 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
451 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
452 subdirectory names correspond to the vendor-independent x86-64
453 microarchitecture levels defined in the x86-64 psABI supplement.
455 * The new --help option of the dynamic linker provides usage and
456 information and library search path diagnostics.
458 * The mallinfo2 function is added to report statistics as per mallinfo,
459 but with larger field widths to accurately report values that are
460 larger than fit in an integer.
462 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
464 * Support for the RISC-V ISA running on Linux has been expanded to run on
465 32-bit hardware. This is supported for the following ISA and ABI pairs:
471 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
474 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
475 glibc may use additional checks that may have an additional performance
476 overhead. At present these checks are available only on LLVM 9 and later.
477 The latest GCC available at this time (10.2) does not support this level of
480 Deprecated and removed features, and other changes affecting compatibility:
482 * The mallinfo function is marked deprecated. Callers should call
485 * When dlopen is used in statically linked programs, alternative library
486 implementations from HWCAP subdirectories are no longer loaded.
487 Instead, the default implementation is used.
489 * The deprecated <sys/vtimes.h> header and the function vtimes have been
490 removed. To support old binaries, the vtimes function continues to exist
491 as a compatibility symbol. Applications should use the getrlimit or
494 * Following a change in the tzdata 2018a release upstream, the zdump
495 program is now installed in the /usr/bin subdirectory. Previously,
496 the /usr/sbin subdirectory was used.
498 * On s390(x), the type float_t is now derived from the macro
499 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
500 hardcoded to double. This does not affect the ABI of any libraries
501 that are part of the GNU C Library, but may affect the ABI of other
502 libraries that use this type in their interfaces. The new definition
503 improves consistency with compiler behavior in many scenarios.
505 * A future version of glibc will stop loading shared objects from the
506 "tls" subdirectories on the library search path, the subdirectory that
507 corresponds to the AT_PLATFORM system name, and also stop employing
508 the legacy AT_HWCAP search mechanism. Applications should switch to
509 the new glibc-hwcaps mechanism instead; if they do not do that, only
510 the baseline version (directly from the search path directory) will be
513 Changes to build and runtime requirements:
515 * On Linux, the system administrator needs to configure /dev/pts with
516 the intended access modes for pseudo-terminals. glibc no longer
517 attemps to adjust permissions of terminal devices. The previous glibc
518 defaults ("tty" group, user read/write and group write) already
519 corresponded to what most systems used, so that grantpt did not
520 perform any adjustments.
522 * On Linux, the posix_openpt and getpt functions no longer attempt to
523 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
524 (and pseudo-terminals are supported), a devpts file system is mounted
525 on /dev/pts. Current systems already meet these requirements.
527 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
529 Security related changes:
531 CVE-2021-3326: An assertion failure during conversion from the
532 ISO-20220-JP-3 character set using the iconv function has been fixed.
533 This assertion was triggered by certain valid inputs in which the
534 converted output contains a combined sequence of two wide characters
535 crossing a buffer boundary. Reported by Tavis Ormandy.
537 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
538 invoked with input containing redundant shift sequences in the IBM1364,
539 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
541 CVE-2020-29562: An assertion failure has been fixed in the iconv function
542 when invoked with UCS4 input containing an invalid character.
544 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
545 invoked with EUC-KR input containing invalid multibyte input sequences.
547 The following bugs are resolved with this release:
549 [10635] libc: realpath portability patches
550 [16124] dynamic-link: ld.so should allow to change argv[0]
551 [17924] malloc: 'free' should not set errno
552 [18683] libc: Linux faccessat implementation can incorrectly ignore
554 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
555 [23091] hurd: missing waitid support
556 [23249] libc: Epyc and other current AMD CPUs do not select the
557 "haswell" platform subdirectory
558 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
560 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
562 [24941] libc: Make grantpt usable after multi-threaded fork in more
564 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
565 [24973] locale: iconv encounters segmentation fault when converting
566 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
567 [25399] string: undefined reference to `__warn_memset_zero_len' when
568 changing gnuc version
569 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
571 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
573 [25971] libc: s390 bits/hwcap.h out of sync with kernel
574 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
575 [26100] libc: Race in syslog(3) with regards to tag printing.
576 [26124] libc: Export <cpu-features.h>
577 [26130] nscd: Inconsistent nscd cache during pruning
578 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
579 [26224] locale: iconv hangs when converting some invalid inputs from
580 several IBM character sets (CVE-2020-27618)
581 [26341] libc: realpath cyclically call __alloca(path_max) to consume
583 [26343] manual: invalid documented return type for strerrorname_np(),
584 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
585 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
587 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
589 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
590 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
592 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
593 [26553] libc: mtx_init allows type set to "mtx_recursive" only
594 [26555] string: strerrorname_np does not return the documented value
595 [26592] libc: pointer arithmetic overflows in realpath
596 [26600] network: Transaction ID collisions cause slow DNS lookups in
598 [26606] libc: [2.33 Regression] pselect is broken on x32
599 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
600 [26620] glob: fnmatch with collating symbols results in segmentation
602 [26625] libc: [2.33 Regression] CET is disabled
603 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
604 at the end of a memory mapping
605 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
606 by the caller to the kernel
607 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
608 [26647] build: [-Werror=array-parameter=] due to different
609 declarations for __sigsetjmp
610 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
612 [26649] stdio: printf should handle non-normal x86 long double numbers
613 gracefully (CVE-2020-29573)
614 [26686] build: -Warray-parameter instances building with GCC 11
615 [26687] build: -Warray-bounds instances building with GCC 11
616 [26690] stdio: Aliasing violation in __vfscanf_internal
617 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
618 [26726] build: GCC warning calling new_composite_name with an array of
620 [26736] libc: FAIL: misc/tst-sysvshm-linux
621 [26737] libc: Random FAIL: rt/tst-shm
622 [26791] libc: Missing O_CLOEXEC in sysconf.c
623 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
625 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
627 [26818] string: aarch64: string tests may run ifunc variants that are
629 [26821] libc: Memory leak test failures on Fedora 33
630 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
631 FSGSBASE/LM/RDRAND check failure
632 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
634 [26853] libc: aarch64: Missing unwind information in statically linked
636 [26923] locale: Assertion failure in iconv when converting invalid
637 UCS4 (CVE-2020-29562)
638 [26926] dynamic-link: aarch64: library dependencies are not bti
640 [26932] libc: sh: Multiple floating point functions defined as stubs
642 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
644 [26988] dynamic-link: aarch64: BTI mprotect address is not page
646 [27002] build: libc_freeres_fn build failure with GCC 11
647 [27004] dynamic-link: ld.so is miscompiled by GCC 11
648 [27008] dynamic-link: ld.so.cache should have endianness markup
649 [27042] libc: [alpha] anonymous union in struct stat confuses
651 [27053] libc: Conformance regression in system(3) (and probably also
653 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
655 [27077] network: Do not reload /etc/nsswitch.conf from chroot
656 [27083] libc: Unsafe unbounded alloca in addmntent
657 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
659 [27130] string: "rep movsb" performance issue
660 [27150] libc: alpha: wait4() is unavailable in static linking
661 [27177] dynamic-link:
662 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
664 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
665 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
666 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
667 related to combining characters (CVE-2021-3326)
674 * Unicode 13.0.0 Support: Character encoding, character type info, and
675 transliteration tables are all updated to Unicode 13.0.0, using
676 generator scripts contributed by Mike FABIAN (Red Hat).
678 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
680 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
681 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
682 Three ABIs are supported:
688 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
689 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
691 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
692 DT_DEPAUDIT dynamic section entries of the main executable.
694 * powerpc64le supports IEEE128 long double libm/libc redirects when
695 using -mabi=ieeelongdouble to compile C code on supported GCC
696 toolchains. It is recommended to use GCC 8 or newer when testing
699 * To help detect buffer overflows and other out-of-bounds accesses
700 several APIs have been annotated with GCC 'access' attribute. This
701 should help GCC 10 issue better warnings.
703 * On Linux, functions pthread_attr_setsigmask_np and
704 pthread_attr_getsigmask_np have been added. They allow applications
705 to specify the signal mask of a thread created with pthread_create.
707 * The GNU C Library now provides the header file <sys/single_threaded.h>
708 which declares the variable __libc_single_threaded. Applications are
709 encouraged to use this variable for single-thread optimizations,
710 instead of weak references to symbols historically defined in
713 * The functions sigabbrev_np and sigdescr_np have been added. The
714 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
715 SIGHUP) while sigdescr_np returns a string describing the signal number
716 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
717 attempt to translate the return description, both functions return
718 NULL for an invalid signal number.
720 They should be used instead of sys_siglist or sys_sigabbrev and they
721 are both thread and async-signal safe. These functions are GNU extensions.
723 * The functions strerrorname_np and strerrordesc_np have been added. The
724 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
725 while strerrordesc_np returns a string describing the error number
726 (e.g "Invalid argument" for EINVAL). Different than strerror,
727 strerrordesc_np does not attempt to translate the return description, both
728 functions return NULL for an invalid error number.
730 They should be used instead of sys_errlist and sys_nerr, both are
731 thread and async-signal safe. These functions are GNU extensions.
733 * AArch64 now supports standard branch protection security hardening
734 in glibc when it is built with a GCC that is configured with
735 --enable-standard-branch-protection (or if -mbranch-protection=standard
736 flag is passed when building both GCC target libraries and glibc,
737 in either case a custom GCC is needed). This includes branch target
738 identification (BTI) and pointer authentication for return addresses
739 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
740 extensions respectively for the protection to be effective,
741 otherwise the used instructions are nops. User code can use PAC-RET
742 without libc support, but BTI requires a libc that is built with BTI
743 support, otherwise runtime objects linked into user code will not be
746 Deprecated and removed features, and other changes affecting compatibility:
748 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
749 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
750 RPC header files. Backward compatibility for old programs is kept
751 only for architectures and ABIs that have been added in or before
752 glibc 2.31. New programs need to use TI-RPC
753 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
754 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
756 * Remove configure option --enable-obsolete-nsl. libnsl is only built
757 as shared library for backward compatibility and the NSS modules "nis"
758 and "nisplus" are not built at all and libnsl's headers aren't
759 installed. This compatibility is kept only for architectures and ABIs
760 that have been added in or before version 2.28. Replacement
761 implementations based on TI-RPC, which additionally support IPv6, are
762 available from <https://github.com/thkukuk/>. This change does not
763 affect the "compat" NSS module, which does not depend on libnsl
764 since 2.27 and thus can be used without NIS.
766 * The deprecated <sys/sysctl.h> header and the sysctl function have been
767 removed. To support old binaries, the sysctl function continues to
768 exist as a compatibility symbol (on those architectures which had it),
769 but always fails with ENOSYS. This reflects the removal of the system
770 call from all architectures, starting with Linux 5.5.
772 * The sstk function is no longer available to newly linked binaries.
773 Its implementation always returned with a failure, and the function
774 was not declared in any header file.
776 * The legacy signal handling functions siginterrupt, sigpause, sighold,
777 sigrelse, sigignore and sigset, and the sigmask macro have been
778 deprecated. Applications should use the sigsuspend, sigprocmask and
779 sigaction functions instead.
781 * ldconfig now defaults to the new format for ld.so.cache. glibc has
782 already supported this format for almost 20 years.
784 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
785 are no longer available to newly linked binaries, and their declarations
786 have been removed from <string.h>. They are exported solely as
787 compatibility symbols to support old binaries. All programs should use
790 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
791 are no longer available to newly linked binaries, and their declarations
792 have been removed from <stdio.h>. They are exported solely as
793 compatibility symbols to support old binaries. All programs should use
794 strerror or strerror_r instead.
796 * Both strerror and strerror_l now share the same internal buffer in the
797 calling thread, meaning that the returned string pointer may be invalided
798 or contents might be overwritten on subsequent calls in the same thread or
799 if the thread is terminated. It makes strerror MT-safe.
801 * Using weak references to libpthread functions such as pthread_create
802 or pthread_key_create to detect the singled-threaded nature of a
803 program is an obsolescent feature. Future versions of glibc will
804 define pthread_create within libc.so.6 itself, so such checks will
805 always flag the program as multi-threaded. Applications should check
806 the __libc_single_threaded variable declared in
807 <sys/single_threaded.h> instead.
809 * The "files" NSS module no longer supports the "key" database (used for
810 secure RPC). The contents of the /etc/publickey file will be ignored,
811 regardless of the settings in /etc/nsswitch.conf. (This method of
812 storing RPC keys only supported the obsolete and insecure AUTH_DES
813 flavor of secure RPC.)
815 * The __morecore and __after_morecore_hook malloc hooks and the default
816 implementation __default_morecore have been deprecated. Applications
817 should use malloc interposition to change malloc behavior, and mmap to
818 allocate anonymous memory. A future version of glibc may require that
819 applications which use the malloc hooks must preload a special shared
820 object, to enable the hooks.
822 * The hesiod NSS module has been deprecated and will be removed in a
823 future version of glibc. System administrators are encouraged to
824 switch to other approaches for networked account databases, such as
827 Changes to build and runtime requirements:
829 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
830 long double redirects.
832 Security related changes:
834 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
835 invoked with the -c option and when processing invalid multi-byte input
836 sequences. Reported by Jan Engelhardt.
838 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
839 corruption when they were passed a pseudo-zero argument. Reported by Guido
840 Vranken / ForAllSecure Mayhem.
842 CVE-2020-1752: A use-after-free vulnerability in the glob function when
843 expanding ~user has been fixed.
845 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
846 memmove functions has been fixed. Discovered by Jason Royes and Samual
847 Dytrych of the Cisco Security Assessment and Penetration Team (See
850 The following bugs are resolved with this release:
852 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
853 [10441] manual: Backtraces code example lacks error checking
854 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
855 timer_sigev_thread dangerous
856 [14231] stdio: stdio-common tests memory requirements
857 [14578] libc: /proc-based emulation for lchmod, fchmodat
858 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
859 filtee has constructor
860 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
861 sequences (CVE-2016-10228)
862 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
863 character entities for infinity & pi
864 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
865 segfaults in applications
866 [20543] libc: Please move from .gnu.linkonce to comdat
867 [22489] network: gcc warns about implicit convertion in
868 ICMP6_FILTER_SETPASS with -Wsign-conversion
869 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
870 [23294] math: Complex _FloatN functions are redirected to the wrong
871 function with -mlong-double-64
872 [23296] libc: Data race in setting function descriptor during lazy
874 [23668] dynamic-link: ldconfig: Default to the new format for
876 [23819] hurd: hurd: Add C11 thread support
877 [23990] build: test-container error out on failure to exec child.
878 [23991] build: shell-container typo in run_command_array
879 [24638] manual: Error in example of parsing a template string
880 [24654] manual: Wrong declaration of wcschr in libc manual
881 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
883 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
884 dynamically loaded dsos
885 [25098] nptl: nptl: ctype classification functions are not AS-Safe
886 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
888 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
889 restore EAX, ECX and EDX
890 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
891 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
892 [25420] network: Race condition in resolv_conf.c can result in caching
893 stale configuration forever
894 [25487] math: sinl() stack corruption from crafted input
896 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
898 [25523] libc: MIPS/Linux inline syscall template is miscompiled
899 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
901 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
902 on 32 bit and old kernel
903 [25635] libc: arm: Wrong sysdep order selection for soft-fp
904 [25639] localedata: Some names of days and months wrongly spelt in
906 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
907 amount of sigset_t bytes
908 [25691] stdio: printf: memory leak when printing long multibyte
910 [25715] libc: system() returns wrong errors when posix_spawn fails
911 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
912 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
913 state for conversions that produce two Unicode code points
914 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
915 for linux x86_64 leads to livelock
916 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
917 test failures, invalid instruction in ld.so
918 [25790] glob: Typo in tst-fnmatch.input
919 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
921 [25819] localedata: Update locale data to Unicode 13.0.0
922 [25824] libc: Abnormal function of strnlen in aarch64
923 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
924 [25896] libc: Incorrect prctl
925 [25902] libc: Bad LOADARGS_N
926 [25905] dynamic-link: VSX registers are corrupted during PLT
927 resolution when glibc is built with --disable-multi-arch and --with-
929 [25933] string: Off by one error in __strncmp_avx2 when
930 length=VEC_SIZE*4 and strings are at page boundaries can cause a
932 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
933 exiting detached thread
934 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
936 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
938 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
939 [26073] math: getpayload() has wrong return value
940 [26076] dynamic-link: dlmopen crashes after failing to load
941 dependencies in audit mode
942 [26120] localedata: column width of of some Korean
943 JUNGSEONG/JONGSEONG characters wrong (should be 0)
944 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
945 [26133] libc: Incorrect need_arch_feature_F16C
946 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
948 [26149] libc: PKU is usable only if OSPKE is set
949 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
951 [26208] libc: Incorrect bit_cpu_CLFSH
952 [26210] network: Incorrect use of hidden symbols for global sunrpc
954 [26211] stdio: printf integer overflow calculating allocation size
955 [26214] stdio: printf_fp double free
956 [26215] stdio: printf_fp memory leak
957 [26232] time: FAIL: support/tst-timespec for 32-bit targets
958 [26258] nss: nss_compat should not read input files with mmap
959 [26332] string: Incorrect cache line size load causes memory
967 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
968 enable features from the draft ISO C2X standard. Only some features from
969 this draft standard are supported by the GNU C Library, and as the draft
970 is under active development, the set of features enabled by this macro is
971 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
972 by compiling with "gcc -std=gnu2x".
974 * The <math.h> functions that round their results to a narrower type now
975 have corresponding type-generic macros in <tgmath.h>, as defined in TS
976 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
977 Clarification Request 13 to TS 18661-3.
979 * The function pthread_clockjoin_np has been added, enabling join with a
980 terminated thread with a specific clock. It allows waiting against
981 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
983 * New locale added: mnw_MM (Mon language spoken in Myanmar).
985 * The DNS stub resolver will optionally send the AD (authenticated data) bit
986 in queries if the trust-ad option is set via the options directive in
987 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
988 mode, the AD bit, as provided by the name server, is available to
989 applications which call res_search and related functions. In the default
990 mode, the AD bit is not set in queries, and it is automatically cleared in
991 responses, indicating a lack of DNSSEC validation. (Therefore, the name
992 servers and the network path to them are treated as untrusted.)
994 Deprecated and removed features, and other changes affecting compatibility:
996 * The totalorder and totalordermag functions, and the corresponding
997 functions for other floating-point types, now take pointer arguments to
998 avoid signaling NaNs possibly being converted to quiet NaNs in argument
999 passing. This is in accordance with the resolution of Clarification
1000 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1001 floating-point arguments directly will continue to work.
1003 * The obsolete function stime is no longer available to newly linked
1004 binaries, and its declaration has been removed from <time.h>.
1005 Programs that set the system time should use clock_settime instead.
1007 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1008 in a future version of glibc. In this release, the header still exists
1009 but calling ftime will cause a compiler warning. All programs should use
1010 gettimeofday or clock_gettime instead.
1012 * The gettimeofday function no longer reports information about a
1013 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1014 many years, as it cannot handle the full complexity of the world's
1015 timezones, but hitherto we have supported it on a best-effort basis.
1016 Changes required to support 64-bit time_t on 32-bit architectures have
1017 made this no longer practical.
1019 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1020 should expect to receive a 'struct timezone' whose tz_minuteswest and
1021 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1022 happen on a few Linux-based ports. This will be corrected in a future
1025 All callers should supply a null pointer for the 'tzp' argument to
1026 gettimeofday. For accurate information about the time zone associated
1027 with the current time, use the localtime function.
1029 gettimeofday itself is obsolescent according to POSIX. We have no plans
1030 to remove access to this function, but portable programs should consider
1031 using clock_gettime instead.
1033 * The settimeofday function can still be used to set a system-wide time
1034 zone when the operating system supports it. This is because the Linux
1035 kernel reused the API, on some architectures, to describe a system-wide
1036 time-zone-like offset between the software clock maintained by the kernel,
1037 and the "RTC" clock that keeps time when the system is shut down.
1039 However, to reduce the odds of this offset being set by accident,
1040 settimeofday can no longer be used to set the time and the offset
1041 simultaneously. If both of its two arguments are non-null, the call
1042 will fail (setting errno to EINVAL).
1044 Callers attempting to set this offset should also be prepared for the call
1045 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1046 some Linux architectures. The Linux kernel maintainers are discussing a
1047 more principled replacement for the reused API. After a replacement
1048 becomes available, we will change settimeofday to fail with ENOSYS on all
1049 platforms when its 'tzp' argument is not a null pointer.
1051 settimeofday itself is obsolescent according to POSIX. Programs that set
1052 the system time should use clock_settime and/or the adjtime family of
1053 functions instead. We may cease to make settimeofday available to newly
1054 linked binaries after there is a replacement for Linux's time-zone-like
1057 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1058 the optional CAS instruction is implemented (for instance, LEON processors
1059 are still supported, but SuperSPARC processors are not).
1061 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1064 * If a lazy binding failure happens during dlopen, during the execution of
1065 an ELF constructor, the process is now terminated. Previously, the
1066 dynamic loader would return NULL from dlopen, with the lazy binding error
1067 captured in a dlerror message. In general, this is unsafe because
1068 resetting the stack in an arbitrary function call is not possible.
1070 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1071 executable stack unless explicitly configured at build time to require
1072 minimum kernel version 4.8 or newer. This is because executing
1073 floating-point branches on a non-executable stack on Linux kernels prior to
1074 4.8 can lead to application crashes for some MIPS configurations. While
1075 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1076 expected to enable non-executable stack by default with PT_GNU_STACK by
1077 default and is thus likely to trigger a crash on older kernels.
1079 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1080 non-executable stack while dropping support for older kernels.
1082 * System call wrappers for time system calls now use the new time64 system
1083 calls when available. On 32-bit targets, these wrappers attempt to call
1084 the new system calls first and fall back to the older 32-bit time system
1085 calls if they are not present. This may cause issues in environments
1086 that cannot handle unsupported system calls gracefully by returning
1087 -ENOSYS. Seccomp sandboxes are affected by this issue.
1089 Changes to build and runtime requirements:
1091 * It is no longer necessary to have recent Linux kernel headers to build
1092 working (non-stub) system call wrappers on all architectures except 64-bit
1093 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1095 * The ChangeLog file is no longer present in the toplevel directory of the
1096 source tree. ChangeLog files are located in the ChangeLog.old directory as
1097 ChangeLog.N where the highest N has the latest entries.
1099 Security related changes:
1101 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1102 out-of-bounds write when executed in a signal frame context.
1104 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1105 environment variable during program execution after a security
1106 transition, allowing local attackers to restrict the possible mapping
1107 addresses for loaded libraries and thus bypass ASLR for a setuid
1108 program. Reported by Marcin Kościelnicki.
1110 The following bugs are resolved with this release:
1112 [12031] localedata: iconv -t ascii//translit with Greek characters
1113 [15813] libc: Multiple issues in __gen_tempname
1114 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1115 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1116 [19767] libc: vdso is not used with static linking
1117 [19903] hurd: Shared mappings not being inherited by children processes
1118 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1119 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1121 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1122 Symbols-A/B Unicode blocks
1123 [23518] libc: Eliminate __libc_utmp_jump_table
1124 [24026] malloc: malloc_info() returns wrong numbers
1125 [24054] localedata: Many locales are missing date_fmt
1126 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1127 [24304] dynamic-link: Lazy binding failure during ELF
1128 constructors/destructors is not fatal
1129 [24376] libc: RISC-V symbol size confusion with _start
1130 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1132 [24824] libc: test-in-container does not install charmap files compatible
1134 [24844] regex: regex bad pointer / leakage if malloc fails
1135 [24867] malloc: Unintended malloc_info formatting changes
1136 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1137 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1138 [24882] libc: login: pututline uses potentially outdated cache
1139 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1140 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1142 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1144 [24930] dynamic-link: dlopen of PIE executable can result in
1145 _dl_allocate_tls_init assertion failure
1146 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1147 (stringop-overflow error)
1148 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1149 functions other can lead to crashes
1150 [24967] libc: jemalloc static linking causes runtime failure
1151 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1153 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1154 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1155 [25097] libc: new -Warray-bounds with GCC 10
1156 [25112] dynamic-link: dlopen must not make new objects accessible when it
1157 still can fail with an error
1158 [25139] localedata: Please add the new mnw_MM locale
1159 [25149] regex: Array bounds violation in proceed_next_node
1160 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1161 initialized correctly
1162 [25189] libc: glibc's __glibc_has_include causes issues with clang
1164 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1165 value to an unsigned
1166 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1167 binaries (CVE-2019-19126)
1168 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1170 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1172 [25232] string: <string.h> does not enable const correctness for strchr et
1174 [25233] localedata: Consider "." as the thousands separator for sl_SI
1176 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1177 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1178 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1180 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1181 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1183 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1184 (dl_initfirst) link map pointer
1185 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1186 [25423] libc: Array overflow in backtrace on powerpc
1187 [25425] network: Missing call to __resolv_context_put in
1188 getaddrinfo.c:gethosts
1195 * Unicode 12.1.0 Support: Character encoding, character type info, and
1196 transliteration tables are all updated to Unicode 12.1.0, using
1197 generator scripts contributed by Mike FABIAN (Red Hat).
1199 * The dynamic linker accepts the --preload argument to preload shared
1200 objects, in addition to the LD_PRELOAD environment variable.
1202 * The twalk_r function has been added. It is similar to the existing
1203 twalk function, but it passes an additional caller-supplied argument
1204 to the callback function.
1206 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1208 * Minguo (Republic of China) calendar support has been added as an
1209 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1212 * The entry for the new Japanese era has been added for ja_JP locale.
1214 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1215 pvalloc, memalign, and posix_memalign fail now with total object size
1216 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1217 pointer subtraction within the allocated object, where results might
1218 overflow the ptrdiff_t type.
1220 * The dynamic linker no longer refuses to load objects which reference
1221 versioned symbols whose implementation has moved to a different soname
1222 since the object has been linked. The old error message, symbol
1223 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1224 link time reference, is gone.
1226 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1227 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1228 functions. These behave similarly to their "timed" equivalents, but also
1229 accept a clockid_t parameter to determine which clock their timeout should
1230 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1231 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1232 time of the wait (unlike with pthread_condattr_setclock, which requires
1233 the clock choice at initialization time).
1235 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1236 work, new resolvers can use a second argument which can be extended in
1237 the future, currently it contains the AT_HWCAP2 value.
1239 Deprecated and removed features, and other changes affecting compatibility:
1241 * The copy_file_range function fails with ENOSYS if the kernel does not
1242 support the system call of the same name. Previously, user space
1243 emulation was performed, but its behavior did not match the kernel
1244 behavior, which was deemed too confusing. Applications which use the
1245 copy_file_range function can no longer rely on glibc to provide a fallback
1246 on kernels that do not support the copy_file_range system call, and if
1247 this function returns ENOSYS, they will need to use their own fallback.
1248 Support for copy_file_range for most architectures was added in version
1249 4.5 of the mainline Linux kernel.
1251 * The functions clock_gettime, clock_getres, clock_settime,
1252 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1253 for new applications (on architectures which had them). Instead, the
1254 definitions in libc will be used automatically, which have been available
1257 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1258 and <sys/stropts.h> have been removed.
1260 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1261 resolver flag (deprecated in glibc 2.25) have been removed.
1263 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1264 resolver have been removed from <resolv.h>.
1266 * With --enable-bind-now, installed programs are now linked with the
1269 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1270 configurations) has been removed, following the deprecation of this
1271 subarchitecture in version 8 of GCC, and its removal in version 9.
1273 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1274 header have been removed.
1276 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1277 deprecated and will be removed from a future version of glibc.
1278 Application should directly access /proc instead. For obtaining random
1279 bits, the getentropy function can be used.
1281 Changes to build and runtime requirements:
1283 * GCC 6.2 or later is required to build the GNU C Library.
1285 Older GCC versions and non-GNU compilers are still supported when
1286 compiling programs that use the GNU C Library.
1288 Security related changes:
1290 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1291 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1292 has undefined behavior. On x32, the size_t argument may be passed
1293 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1294 32 bits. When it happened with the sign bit of RDX register set,
1295 memcmp gave the wrong result since it treated the size argument as
1296 zero. Reported by H.J. Lu.
1298 CVE-2019-9169: Attempted case-insensitive regular-expression match
1299 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1300 over-read. Reported by Hongxu Chen.
1302 The following bugs are resolved with this release:
1304 [2872] locale: Transliteration Cyrillic -> ASCII fails
1305 [6399] libc: gettid() should have a wrapper
1306 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1307 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1308 [17396] localedata: globbing for locale by [[.collating-element.]]
1309 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1310 [18465] malloc: memusagestat is built using system C library
1311 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1312 invalid input drops valid char
1313 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1314 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1315 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1316 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1317 [23352] malloc: __malloc_check_init still defined in public header
1319 [23403] nptl: Wrong alignment of TLS variables
1320 [23501] libc: nftw() doesn't return dangling symlink's inode
1321 [23733] malloc: Check the count before calling tcache_get()
1322 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1324 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1325 [23844] nptl: pthread_rwlock_trywrlock results in hang
1326 [23983] argparse: Missing compat versions of argp_failure and argp_error
1327 for long double = double
1328 [23984] libc: Missing compat versions of err.h and error.h functions for
1329 long double = double
1330 [23996] localedata: Dutch salutations
1331 [24040] libc: riscv64: unterminated call chain in __thread_start
1332 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1334 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1335 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1337 [24114] regex: regexec buffer read overrun in "grep -i
1338 '\(\(\)*.\)*\(\)\(\)\1'"
1339 [24122] libc: Segfaults if 0 returned from la_version
1340 [24153] stdio: Some input functions do not react to stdin assignment
1341 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1342 RDX is set) (CVE-2019-7309)
1343 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1344 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1345 not the default "nor"
1346 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1347 false positives, change to modern flexible array
1348 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1349 instructions while maintaining the robust mutex list due to missing
1351 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1352 unnecessary librt dependencies
1353 [24200] localedata: Revert first_weekday removal in en_IE locale
1354 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1355 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1356 [24216] malloc: Check for large bin list corruption when inserting
1358 [24228] stdio: old x86 applications that use legacy libio crash on exit
1359 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1361 [24293] localedata: Missing Minguo calendar support for TW locales
1362 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1363 tt_RU (Tatar) locale
1364 [24307] localedata: Update locale data to Unicode 12.0.0
1365 [24323] dynamic-link: dlopen should not be able open PIE objects
1366 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1367 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1368 tt_RU (Tatar) locale
1369 [24370] localedata: Add lang_name for tt_RU locale
1370 [24372] locale: Binary locale files are not architecture independent
1371 [24394] time: strptime %Ey mis-parses final year of era
1372 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1374 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1376 [24531] malloc: Malloc tunables give tcache assertion failures
1377 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1379 [24535] localedata: Update locale data to Unicode 12.1.0
1380 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1381 kernels and break testing
1382 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1383 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1384 [-Werror=format-overflow=]
1385 [24570] libc: alpha: compat msgctl uses __IPC_64
1386 [24584] locale: Data race in __wcsmbs_clone_conv
1387 [24588] stdio: Remove codecvt vtables from libio
1388 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1390 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1391 [24632] stdio: Old binaries which use freopen with default stdio handles
1393 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1395 [24652] localedata: szl_PL spelling correction
1396 [24695] nss: nss_db: calling getpwent after endpwent crashes
1397 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1398 in /etc/nsswitch.conf
1399 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1400 [24740] libc: getdents64 type confusion
1401 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1402 always implemented in the same library
1403 [24744] libc: Remove copy_file_range emulation
1404 [24757] malloc: memusagestat is linked against system libpthread
1405 [24794] libc: Partial test suite run builds corrupt test-in-container
1413 * The getcpu wrapper function has been added, which returns the currently
1414 used CPU and NUMA node. This function is Linux-specific.
1416 * A new convenience target has been added for distribution maintainers
1417 to build and install all locales as directories with files. The new
1418 target is run by issuing the following command in your build tree:
1419 'make localedata/install-locale-files', with an optional DESTDIR
1420 to set the install root if you wish to install into a non-default
1421 configured location.
1423 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1425 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1426 for _GNU_SOURCE, to match BSD environments.
1428 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1429 indicates that it will abort the transaction prior to entering the kernel
1430 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1431 suspended, and this caused some undefined side-effects issues by aborting
1432 transactions manually. Glibc avoided it by abort transactions manually on
1433 each syscall, but it lead to performance issues on newer kernels where the
1434 HTM state is saved and restore lazily (the state being saved even when the
1435 process actually does not use HTM).
1437 * The functions posix_spawn_file_actions_addchdir_np and
1438 posix_spawn_file_actions_addfchdir_np have been added, enabling
1439 posix_spawn and posix_spawnp to run the new process in a different
1440 directory. These functions are GNU extensions. The function
1441 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1444 * The popen and system do not run atfork handlers anymore (BZ#17490).
1445 Although it is a possible POSIX violation, the POSIX rationale in
1446 pthread_atfork documentation regarding atfork handlers is to handle
1447 inconsistent mutex state after a fork call in a multi-threaded process.
1448 In both popen and system there is no direct access to user-defined mutexes.
1450 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1451 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1453 - C-SKY ABIV2 soft-float little-endian
1454 - C-SKY ABIV2 hard-float little-endian
1456 * strftime's default formatting of a locale's alternative year (%Ey)
1457 has been changed to zero-pad the year to a minimum of two digits,
1458 like "%y". This improves the display of Japanese era years during
1459 the first nine years of a new era, and is expected to be harmless
1460 for all other locales (only Japanese locales regularly have
1461 alternative year numbers less than 10). Zero-padding can be
1462 overridden with the '_' or '-' flags (which are GNU extensions).
1464 * As a GNU extension, the '_' and '-' flags can now be applied to
1465 "%EY" to control how the year number is formatted; they have the
1466 same effect that they would on "%Ey".
1468 Deprecated and removed features, and other changes affecting compatibility:
1470 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1471 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1473 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1474 in <sys/procfs.h>, has been corrected to match the type actually used by
1475 the Linux kernel. This affects the size and layout of that structure on
1476 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1478 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1479 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1480 defined in <sys/procfs.h>, has been corrected to match the type actually
1481 used by the Linux kernel. This affects the size and layout of those
1484 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1485 meant to scan a string and allocate space for it with malloc, is now
1486 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1487 defined. This extension conflicts with C99's use of '%a' to scan a
1488 hexadecimal floating-point number, which is now available to programs
1489 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1491 POSIX.1-2008 includes the feature of allocating a buffer for string input
1492 with malloc, using the modifier letter 'm' instead. Programs using
1493 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1494 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1495 C99 '%a' no longer need to avoid _GNU_SOURCE.
1497 GCC's -Wformat warnings can detect most uses of this extension, as long
1498 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1499 __attribute__ ((format (scanf, ...))).
1501 Changes to build and runtime requirements:
1503 * Python 3.4 or later is required to build the GNU C Library.
1505 * On most architectures, GCC 5 or later is required to build the GNU C
1506 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1508 Older GCC versions and non-GNU compilers are still supported when
1509 compiling programs that use the GNU C Library.
1511 Security related changes:
1513 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1514 denial of service due to resource exhaustion when processing getaddrinfo
1515 calls with crafted host names. Reported by Guido Vranken.
1517 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1518 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1519 happened, accessing the 32-bit size_t value as the full 64-bit register
1520 in the assembly string/memory functions would cause a buffer overflow.
1521 Reported by H.J. Lu.
1523 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1524 addresses with arbitrary trailing characters, potentially leading to data
1525 or command injection issues in applications.
1527 The following bugs are resolved with this release:
1529 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1530 [10496] localedata: 12h time representation in multiple locales faulty
1531 [10797] localedata: it_IT locale numeric does not have a separator for
1533 [11319] libc: dprintf doesn't handle errors properly
1534 [16346] time: mktime: potentially unsafe use of localtime_offset
1535 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1537 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1538 posix_spawn_file_actions_addfchdir_np
1539 [17426] localedata: Indian locales: set the correct date format
1540 [17490] stdio: popen should not invoke atfork handlers
1541 [17783] libc: TIOCSER_TEMT conditions inconsistent
1542 [18040] regex: use-after-free in regexec/get_subexp
1543 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1544 [20018] network: getaddrinfo should reject IP addresses with trailing
1545 characters (CVE-2016-10739)
1546 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1547 [20271] libc: Missing "\n" in __libc_fatal calls
1548 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1549 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1550 pointer argument is non-NULL
1551 [21037] stdio: open_memstream and freopen
1552 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1553 [21716] time: Crash in glibc's mktime in low-memory situations
1554 [22834] stdio: Subprocess forked by popen may crash in Linux when
1555 multithreads call popen
1556 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1557 and pthread_create fails.
1558 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1559 [23125] libc: riscv64: endless loop when throwing an exception from a
1561 [23275] nptl: Race in pthread_mutex_lock while promoting to
1562 PTHREAD_MUTEX_ELISION_NP.
1563 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1565 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1567 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1569 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1570 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1572 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1573 [23521] nss: get_next_alias nss_files file stream leak
1574 [23538] nptl: Hang in pthread_cond_broadcast
1575 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1576 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1577 [23579] libc: Errors misreported in preadv2
1578 [23597] build: support/test-container.c doesn't work with different
1580 [23603] time: mktime signed integer overflow on large timestamps
1581 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1582 [23614] libc: powerpc: missing CFI register information in __mpn_*
1584 [23637] string: Generic strstr/strcasestr fails with huge needles
1585 [23640] libc: no way to easily clear FD_CLOEXEC in
1586 posix_spawn_file_actions_adddup2()
1587 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1589 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1591 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1592 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1593 bits/types/struct_rusage.h
1594 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1596 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1598 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1599 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1600 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1602 [23724] localedata: Albanian date formats are incorrect
1603 [23735] math: libnldbl_nonshared.a references internal libm symbols
1604 [23740] localedata: kl_GL: Month names and date formats need update
1605 [23744] regex: regex refactorings to remove BE, avoid duplication
1606 [23745] time: mktime fix for Gnulib + coreutils
1607 [23758] time: Improve the width of alternate representation for year in
1609 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1610 [23789] time: mktime does not set errno on failure
1611 [23791] localedata: Wrong monetary format for ca_ES locale
1612 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1613 [23794] locale: c16rtomb does not handle surrogate pairs
1614 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1615 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1616 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1617 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1618 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1619 [23862] libc: [sh] missing kernel-features.h undefines
1620 [23864] libc: [riscv] missing kernel-features.h undefines
1621 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1622 [23907] malloc: Incorrect double-free malloc tcache check disregards
1624 [23913] libc: off-by-one in function maybe_script_execute in
1625 sysdeps/posix/spawni.c
1626 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1627 [23923] locale: Add --no-hard-links option to localedef
1628 [23927] network: Linux if_nametoindex() does not close descriptor
1630 [23961] math: powf can overflow to inf without setting errno in non-
1631 nearest rounding mode
1632 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1633 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1634 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1635 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1636 [24011] localedata: Fixed small type in comment for locale bs_BA
1637 [24018] libc: gettext() may return NULL
1638 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1639 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1640 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1642 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1643 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1645 [24046] localedata: en_US locale doesn't define date_fmt
1646 [24063] manual: @var{errno} should be @code{errno}
1647 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1648 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1650 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1652 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1654 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1656 [24112] network: Do not send DNS queries for non-host names (where all
1657 answers will be rejected)
1658 [24130] libc: alpha __remqu corrupts $f3 register
1665 * The localization data for ISO 14651 is updated to match the 2016
1666 Edition 4 release of the standard, this matches data provided by
1667 Unicode 9.0.0. This update introduces significant improvements to the
1668 collation of Unicode characters. This release deviates slightly from
1669 the standard in that the collation element ordering for lowercase and
1670 uppercase LATIN script characters is adjusted to ensure that regular
1671 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1672 is not matched by [a-z]. With the update many locales have been
1673 updated to take advantage of the new collation information. The new
1674 collation information has increased the size of the compiled locale
1675 archive or binary locales.
1677 * The GNU C Library can now be compiled with support for Intel CET, AKA
1678 Intel Control-flow Enforcement Technology. When the library is built
1679 with --enable-cet, the resulting glibc is protected with indirect
1680 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1681 compatible with all existing executables and shared libraries. This
1682 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1683 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1684 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1685 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1686 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1687 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1690 * The GNU C Library now has correct support for ABSOLUTE symbols
1691 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1692 relocated incorrectly or in some cases discarded. The GNU linker can
1693 make use of the newer semantics, but it must communicate it to the
1694 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1695 field) to indicate such support is required.
1697 * Unicode 11.0.0 Support: Character encoding, character type info, and
1698 transliteration tables are all updated to Unicode 11.0.0, using
1699 generator scripts contributed by Mike FABIAN (Red Hat).
1701 * <math.h> functions that round their results to a narrower type are added
1702 from TS 18661-1:2014 and TS 18661-3:2015:
1704 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1705 fMxaddfNx functions.
1707 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1708 fMxsubfNx functions.
1710 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1711 fMxmulfNx functions.
1713 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1714 fMxdivfNx functions.
1716 * Two grammatical forms of month names are now supported for the following
1717 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1718 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1719 support two grammatical forms in abbreviated month names: Catalan, Greek,
1722 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1723 include the support for two grammatical forms of month names.
1725 * Building and running on GNU/Hurd systems now works without out-of-tree
1728 * The renameat2 function has been added, a variant of the renameat function
1729 which has a flags argument. If the flags are zero, the renameat2 function
1730 acts like renameat. If the flag is not zero and there is no kernel
1731 support for renameat2, the function will fail with an errno value of
1732 EINVAL. This is different from the existing gnulib function renameatu,
1733 which performs a plain rename operation in case of a RENAME_NOREPLACE
1734 flags and a non-existing destination (and therefore has a race condition
1735 that can clobber the destination inadvertently).
1737 * The statx function has been added, a variant of the fstatat64
1738 function with an additional flags argument. If there is no direct
1739 kernel support for statx, glibc provides basic stat support based on
1740 the fstatat64 function.
1742 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1743 library if installed. libidn2 version 2.0.5 or later is recommended. If
1744 libidn2 is not available, internationalized domain names are not encoded
1745 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1746 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1747 with an encoding error.) Flags which used to change the IDN encoding and
1748 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1749 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1750 deprecated. They no longer have any effect.
1752 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1753 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1754 range of ELF gABI expressions including such constructs as
1755 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1756 have been further restricted, and where in the past a dynamic string
1757 token sequence may have been interpreted as a literal string it will
1758 now cause a load failure. These load failures were always considered
1759 unspecified behaviour from the perspective of the dynamic loader, and
1760 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1761 results in a load failure now.
1763 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1764 implementation includes all the standard functions provided by
1767 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1768 thrd_detach, thrd_exit, and thrd_join for thread management.
1770 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1771 mtx_destroy for mutual exclusion.
1773 - call_once for function call synchronization.
1775 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1776 cnd_wait for conditional variables.
1778 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1780 Application developers must link against libpthread to use ISO C threads.
1782 Deprecated and removed features, and other changes affecting compatibility:
1784 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1785 installed. Software that was using either header should be updated to
1786 use standard <stdio.h> interfaces instead.
1788 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1789 This was never required by the C standard, and the macros just expanded
1790 to call alternative names for the same functions. If you hoped getc and
1791 putc would provide performance improvements over fgetc and fputc, instead
1792 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1793 necessary, flockfile and funlockfile.
1795 * All stdio functions now treat end-of-file as a sticky condition. If you
1796 read from a file until EOF, and then the file is enlarged by another
1797 process, you must call clearerr or another function with the same effect
1798 (e.g. fseek, rewind) before you can read the additional data. This
1799 corrects a longstanding C99 conformance bug. It is most likely to affect
1800 programs that use stdio to read interactive input from a terminal.
1803 * The macros 'major', 'minor', and 'makedev' are now only available from
1804 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1805 headers that happen to include <sys/types.h>. These macros are rarely
1806 used, not part of POSIX nor XSI, and their names frequently collide with
1807 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1808 further explanation.
1810 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1811 these macros should first include <sys/types.h>, and then include
1812 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1814 * The tilegx*-*-linux-gnu configurations are no longer supported.
1816 * The obsolete function ustat is no longer available to newly linked
1817 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1818 function has been deprecated in favor of fstatfs and statfs.
1820 * The obsolete function nfsservctl is no longer available to newly linked
1821 binaries. This function was specific to systems using the Linux kernel
1822 and could not usefully be used with the GNU C Library on systems with
1823 version 3.1 or later of the Linux kernel.
1825 * The obsolete function name llseek is no longer available to newly linked
1826 binaries. This function was specific to systems using the Linux kernel
1827 and was not declared in a header. Programs should use the lseek64 name
1828 for this function instead.
1830 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1831 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1832 previously selected by them is now always enabled.
1834 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1835 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1836 restriction (rejecting '_' in host names, among other things) has been
1837 removed, for increased compatibility with non-IDN name resolution.
1839 * The fcntl function now have a Long File Support variant named fcntl64. It
1840 is added to fix some Linux Open File Description (OFD) locks usage on non
1841 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1842 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1843 locks act as a cancellation entrypoint.
1845 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1846 ecb_crypt, and des_setparity are no longer available to newly linked
1847 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1848 longer installed. These functions encrypted and decrypted data with the
1849 DES block cipher, which is no longer considered secure. Software that
1850 still uses these functions should switch to a modern cryptography library,
1853 * Reflecting the removal of the encrypt and setkey functions above, the
1854 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1855 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1858 * The obsolete function fcrypt is no longer available to newly linked
1859 binaries. It was just another name for the standard function crypt,
1860 and it has not appeared in any header file in many years.
1862 * We have tentative plans to hand off maintenance of the passphrase-hashing
1863 library, libcrypt, to a separate development project that will, we hope,
1864 keep up better with new passphrase-hashing algorithms. We will continue
1865 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1866 'crypt_r' should not need to change at all; however, distributions will
1867 need to install <crypt.h> and libcrypt from a separate project.
1869 In this release, if the configure option --disable-crypt is used, glibc
1870 will not install <crypt.h> or libcrypt, making room for the separate
1871 project's versions of these files. The plan is to make this the default
1872 behavior in a future release.
1874 Changes to build and runtime requirements:
1876 GNU make 4.0 or later is now required to build glibc.
1878 Security related changes:
1880 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1881 been fixed by removing the glibc-internal IDNA implementation and using
1882 the system-provided libidn2 library instead. Originally reported by Hanno
1883 Böck and Christian Weisgerber.
1885 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1886 architecture could corrupt memory. Reported by Max Horn.
1888 CVE-2018-11236: Very long pathname arguments to realpath function could
1889 result in an integer overflow and buffer overflow. Reported by Alexey
1892 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1893 architecture could write beyond the target buffer, resulting in a buffer
1894 overflow. Reported by Andreas Schwab.
1896 The following bugs are resolved with this release:
1898 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1899 [6889] manual: 'PWD' mentioned but not specified
1900 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1901 when __WORDSIZE != 64
1902 [13762] regex: re_search etc. should return -2 on memory exhaustion
1903 [13888] build: /tmp usage during testing
1904 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1905 [14092] nptl: Support C11 threads
1906 [14095] localedata: Review / update collation data from Unicode / ISO
1908 [14508] libc: -Wformat warnings
1909 [14553] libc: Namespace pollution loff_t in sys/types.h
1910 [14890] libc: Make NT_PRFPREG canonical.
1911 [15105] libc: Extra PLT references with -Os
1912 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1914 [16335] manual: Feature test macro documentation incomplete and out of
1916 [16552] libc: Unify umount implementations in terms of umount2
1917 [17082] libc: htons et al.: statement-expressions prevent use on global
1918 scope with -O1 and higher
1919 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1920 [17438] localedata: pt_BR: wrong d_fmt delimiter
1921 [17662] libc: please implement binding for the new renameat2 syscall
1922 [17721] libc: __restrict defined as /* Ignore */ even in c11
1923 [17979] libc: inconsistency between uchar.h and stdint.h
1924 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1925 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1926 horrible machine code)
1927 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1929 [18471] libc: llseek should be a compat symbol
1930 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1932 [18991] nss: nss_files skips large entry in database
1933 [19239] libc: Including stdlib.h ends up with macros major and minor being
1935 [19463] libc: linknamespace failures when compiled with -Os
1936 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1937 [19527] locale: Normalized charset name not recognized by setlocale
1938 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1939 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1941 [19728] network: out of bounds stack read in libidn function
1942 idna_to_ascii_4i (CVE-2016-6261)
1943 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1944 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1945 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1947 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1948 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1949 [20419] dynamic-link: files with large allocated notes crash in
1951 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1952 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1953 [20980] manual: CFLAGS environment variable replaces vital options
1954 [21163] regex: Assertion failure in pop_fail_stack when executing a
1955 malformed regexp (CVE-2015-8985)
1956 [21234] manual: use of CFLAGS makes glibc detect no optimization
1957 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1958 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1959 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1960 [21508] locale: intl/tst-gettext failure with latest msgfmt
1961 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1962 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1963 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1965 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1967 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1968 [22247] network: Integer overflow in the decode_digit function in
1969 puny_decode.c in libidn (CVE-2017-14062)
1970 [22342] nscd: NSCD not properly caching netgroup
1971 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1972 [22550] localedata: es_ES locale (and other es_* locales): collation
1973 should treat ñ as a primary different character, sync the collation
1974 for Spanish with CLDR
1975 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1976 by gcc configured with --enable-default-pie
1977 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1978 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1979 crossing 2GB threshold (CVE-2017-18269)
1980 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1982 [22735] time: Misleading typo in time.h source comment regarding
1984 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1985 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1986 `__assert_perror_fail ()' to `__assert_fail_base ()'
1987 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1989 [22786] libc: Stack buffer overflow in realpath() if input size is close
1990 to SSIZE_MAX (CVE-2018-11236)
1991 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1992 through an absolute DT_NEEDED path
1993 [22792] build: tcb-offsets.h dependency dropped
1994 [22797] libc: pkey_get() uses non-reserved name of argument
1995 [22807] libc: PTRACE_* constants missing for powerpc
1996 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1997 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1998 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1999 [22848] localedata: ca_ES: update date definitions from CLDR
2000 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2001 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2002 [22896] localedata: Update locale data for an_ES
2003 [22902] math: float128 test failures with GCC 8
2004 [22918] libc: multiple common of `__nss_shadow_database'
2005 [22919] libc: sparc32: backtrace yields infinite backtrace with
2007 [22926] libc: FTBFS on powerpcspe
2008 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2010 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2011 [22947] libc: FAIL: misc/tst-preadvwritev2
2012 [22963] localedata: cs_CZ: Add alternative month names
2013 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2014 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2015 [22998] dynamic-link: execstack tests are disabled when SELinux is
2017 [23005] network: Crash in __res_context_send after memory allocation
2019 [23007] math: strtod cannot handle -nan
2020 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2021 [23036] regex: regex equivalence class regression
2022 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2023 [23069] libc: sigaction broken on riscv64-linux-gnu
2024 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2025 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2026 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2027 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2028 and libc build with -Os)
2029 [23140] localedata: More languages need two forms of month names
2030 [23145] libc: _init/_fini aren't marked as hidden
2031 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2032 [23171] math: C++ iseqsig for long double converts arguments to double
2033 [23178] nscd: sudo will fail when it is run in concurrent with commands
2034 that changes /etc/passwd
2035 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2037 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2038 [23208] localedata: New locale - Lower Sorbian (dsb)
2039 [23233] regex: Memory leak in build_charclass_op function in file
2041 [23236] stdio: Harden function pointers in _IO_str_fields
2042 [23250] nptl: Offset of __private_ss differs from GCC
2043 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2044 -mtune=generic -mfpmath=sse
2045 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2047 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2048 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2050 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2051 [23277] math: nan function should not have const attribute
2052 [23279] math: scanf and strtod wrong for some hex floating-point
2053 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2055 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2056 [23303] build: undefined reference to symbol
2057 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2058 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2060 [23313] stdio: libio vtables validation and standard file object
2062 [23329] libc: The __libc_freeres infrastructure is not properly run across
2064 [23349] libc: Various glibc headers no longer compatible with
2066 [23351] malloc: Remove unused code related to heap dumps and malloc
2068 [23363] stdio: stdio-common/tst-printf.c has non-free license
2069 [23396] regex: Regex equivalence regression in single-byte locales
2070 [23422] localedata: oc_FR: More updates of locale data
2071 [23442] build: New warning with GCC 8
2072 [23448] libc: Out of bounds access in IBM-1390 converter
2073 [23456] libc: Wrong index_cpu_LZCNT
2074 [23458] build: tst-get-cpu-features-static isn't added to tests
2075 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2077 [23467] dynamic-link: x86/CET: A property note parser bug
2084 * The GNU C Library can now be compiled with support for building static
2085 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2086 executables are like static executables but can be loaded at any address
2087 and provide additional security hardening benefits at the cost of some
2088 memory and performance. When the library is built with --enable-static-pie
2089 the resulting libc.a is usable with GCC 8 and above to create static PIE
2090 executables using the GCC option '-static-pie'. This feature is currently
2091 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2092 aarch64 with binutils 2.30 or later.
2094 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2095 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2098 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2100 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2102 * In order to support faster and safer process termination the malloc API
2103 family of functions will no longer print a failure address and stack
2104 backtrace after detecting heap corruption. The goal is to minimize the
2105 amount of work done after corruption is detected and to avoid potential
2106 security issues in continued process execution. Reducing shutdown time
2107 leads to lower overall process restart latency, so there is benefit both
2108 from a security and performance perspective.
2110 * The abort function terminates the process immediately, without flushing
2111 stdio streams. Previous glibc versions used to flush streams, resulting
2112 in deadlocks and further data corruption. This change also affects
2113 process aborts as the result of assertion failures.
2115 * On platforms where long double has the IEEE binary128 format (aarch64,
2116 alpha, mips64, riscv, s390 and sparc), the math library now implements
2117 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2118 These are the same interfaces added in version 2.26 for some platforms where
2119 this format is supported but is not the format of long double.
2121 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2122 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2123 implements interfaces for that type, as defined by ISO/IEC TS
2124 18661-3:2015. These are corresponding interfaces to those supported for
2127 * The math library now implements interfaces for the _Float32, _Float64 and
2128 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2129 corresponding interfaces to those supported for _Float128.
2131 * glibc now implements the memfd_create and mlock2 functions on Linux.
2133 * Support for memory protection keys was added. The <sys/mman.h> header now
2134 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2137 * The copy_file_range function was added.
2139 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2141 * The ldconfig utility now processes `include' directives using the C/POSIX
2142 collation ordering. Previous glibc versions used locale-specific
2143 ordering, the change might break systems that relied on that.
2145 * Support for two grammatical forms of month names has been added.
2146 In a call to strftime, the "%B" and "%b" format specifiers will now
2147 produce the grammatical form required when the month is used as part
2148 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2149 required when the month is named by itself. For instance, in Greek
2150 and in many Slavic and Baltic languages, "%B" will produce the month
2151 in genitive case, and "%OB" will produce the month in nominative case.
2153 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2154 are all valid and will all accept any known form of month
2155 name---standalone or complete, abbreviated or full. In a call to
2156 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2157 the strings used by "%B" and "%b", respectively. New query
2158 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2159 used by "%OB" and "%Ob", respectively.
2161 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2162 define the strings for %OB and %Ob, respectively; these have the
2163 same syntax as "mon" and "abmon". These arrays are optional; if they
2164 are not provided then they have the same content as "mon" and "abmon",
2167 These features are provided for locales which define "alt_mon" and/or
2168 "ab_alt_mon" in their locale source data. This release includes such
2169 alternative month name data for the following languages: Belarusian,
2170 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2172 This feature is currently a GNU extension, but it is expected to
2173 be added to the next revision of POSIX, and it is also already
2174 available on some BSD-derived operating systems.
2176 This feature will cause existing statically compiled applications
2177 to fail to load locales and fall back to the builtin C/POSIX locales.
2178 See notes below for other changes affecting compatibility.
2180 * Support for the RISC-V ISA running on Linux has been added. This port
2181 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2182 for the following ISA and ABI pairs:
2188 Deprecated and removed features, and other changes affecting compatibility:
2190 * Statically compiled applications attempting to load locales compiled for the
2191 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2192 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2193 support for two grammatical forms of the month names, also extends the locale
2194 data binary format. Static applications needing locale support must be
2195 recompiled to match the runtime and data they are deployed with. In some
2196 distributions there is an upgrade window where dynamically linked applications
2197 may use a new library but the old locale data and also fall back to the
2198 builtin C/POSIX locales; restarting the application process is sufficient to
2201 * Support for statically linked applications which call dlopen is deprecated
2202 and will be removed in a future version of glibc. Applications which call
2203 dlopen need to be linked dynamically instead.
2205 * Support for old programs which use internal stdio data structures and
2206 functions is deprecated. This includes programs which use the C++ streams
2207 provided by libstdc++ in GCC 2.95. Programs which use the internal
2208 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2209 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2210 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2211 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2212 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2213 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2214 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2215 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2216 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2217 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2218 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2219 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2220 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2221 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2222 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2223 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2224 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2225 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2226 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2227 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2228 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2229 future version of glibc. Unlike other symbol removals, these old
2230 applications will not be supported using compatibility symbols.
2232 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2233 defined by <sys/ptrace.h>.
2235 * libm no longer supports SVID error handling (calling a user-provided
2236 matherr function on error) or the _LIB_VERSION variable to control error
2237 handling. (SVID error handling and the _LIB_VERSION variable still work
2238 for binaries linked against older versions of the GNU C Library.) The
2239 libieee.a library is no longer provided. math.h no longer defines struct
2240 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2241 TLOSS, PLOSS and HUGE.
2243 * The libm functions pow10, pow10f and pow10l are no longer supported for
2244 new programs. Programs should use the standard names exp10, exp10f and
2245 exp10l for these functions instead.
2247 * The mcontext_t type is no longer the same as struct sigcontext. On
2248 platforms where it was previously the same, this changes the C++ name
2249 mangling for interfaces involving this type.
2251 * The add-ons mechanism for building additional packages at the same time as
2252 glibc has been removed. The --enable-add-ons configure option is now
2255 * The --without-fp configure option is now ignored. Whether hardware
2256 floating-point instructions are used is now configured based on whether
2257 the compiler used at configure time (without any options implied by a
2258 --with-cpu= configure option) uses such instructions.
2260 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2261 the specified string can be parsed as a domain name.
2263 * In the malloc_info output, the <heap> element may contain another <aspace>
2264 element, "subheaps", which contains the number of sub-heaps.
2266 * The libresolv function p_secstodate is no longer supported for new
2269 * The tilepro-*-linux-gnu configuration is no longer supported.
2271 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2272 and will be removed in a future release. Software that is still using
2273 either header should be updated to use standard <stdio.h> interfaces
2276 libio.h was originally the header for a set of supported GNU extensions,
2277 but they have not been maintained as such in many years, they are now
2278 standing in the way of improvements to stdio, and we don't think there are
2279 any remaining external users. _G_config.h was never intended for public
2280 use, but predates the bits convention.
2282 Changes to build and runtime requirements:
2284 * bison version 2.7 or later is required to generate code in the 'intl'
2287 Security related changes:
2289 CVE-2009-5064: The ldd script would sometimes run the program under
2290 examination directly, without preventing code execution through the
2291 dynamic linker. (The glibc project disputes that this is a security
2292 vulnerability; only trusted binaries must be examined using the ldd
2295 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2296 suffered from a one-byte overflow during ~ operator processing (either
2297 on the stack or the heap, depending on the length of the user name).
2298 Reported by Tim Rühsen.
2300 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2301 would sometimes fail to free memory allocated during ~ operator
2302 processing, leading to a memory leak and, potentially, to a denial
2305 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2306 without GLOB_NOESCAPE, could write past the end of a buffer while
2307 unescaping user names. Reported by Tim Rühsen.
2309 CVE-2017-17426: The malloc function, when called with an object size near
2310 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2311 instead of NULL. This was a regression introduced with the new malloc
2312 thread cache in glibc 2.26. Reported by Iain Buclaw.
2314 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2315 to the allocation of too much memory. (This is not a security bug per se,
2316 it is mentioned here only because of the CVE assignment.) Reported by
2319 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2320 of the number of search path components. (This is not a security
2321 vulnerability per se because no trust boundary is crossed if the fix for
2322 CVE-2017-1000366 has been applied, but it is mentioned here only because
2323 of the CVE assignment.) Reported by Qualys.
2325 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2326 for AT_SECURE or SUID binaries could be used to load libraries from the
2329 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2330 succeeds without returning an absolute path due to unexpected behaviour
2331 of the Linux kernel getcwd syscall. Reported by halfdog.
2333 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2334 an object size near the value of SIZE_MAX, would return a pointer to a
2335 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2337 CVE-2018-6551: The malloc function, when called with an object size near
2338 the value of SIZE_MAX, would return a pointer to a buffer which is too
2339 small, instead of NULL.
2341 The following bugs are resolved with this release:
2343 [866] glob: glob should match dangling symlinks
2344 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2345 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2347 [5997] math: Very slow execution of sinf function
2348 [10580] localedata: hr_HR: updated locale
2349 [10871] locale: 'mon' array should contain both nominative and genitive
2351 [12349] localedata: eu_ES: incorrect thousands separator
2352 [13605] localedata: shn_MM: new Shan locale
2353 [13805] localedata: ru_RU: currency should use ',' as radix point
2354 [13953] localedata: km_KH: locale update
2355 [13994] localedata: mjw_IN: new locale
2356 [14121] build: make writes .mo files in po directory
2357 [14333] libc: Fix the race between atexit() and exit()
2358 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2359 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2361 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2362 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2363 width Latin characters
2364 [15332] localedata: es_CU: locale update
2365 [15436] stdio: Don't close or flush stdio streams on abort
2366 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2368 [16148] localedata: ca_ES: incorrect thousands separator
2369 [16750] dynamic-link: ldd should not try to execute the binaries
2371 [16777] localedata: pl_PL: incorrect thousands separator in locale
2372 [16905] localedata: hanzi: new collation
2373 [17563] localedata: cmn_TW: add hanzi collation
2374 [17750] localedata: wrong collation order of diacritics in most locales
2375 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2377 [17956] build: Build fails on missing definitions from header file
2378 nss/nss.h when Mozilla NSS is used for cryptography
2379 [18203] libc: realpath() does not handle unreachable paths correctly
2380 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2381 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2382 [18822] libc: Internal functions are called via PLT
2383 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2384 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2385 [19574] libc: glibc should support building static PIE binaries
2386 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2388 [19971] glob: glob: Do not skip entries with zero d_ino values
2389 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2390 [20008] localedata: km_KH: convert to translit_neutral
2391 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2392 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2393 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2394 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2395 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2397 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2398 they're set, wrong errors returned by gaih_inet when lookup functions
2400 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2401 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2403 [20952] localedata: yuw_PG: new locale
2404 [21084] localedata: charmaps/IBM858: new codepage
2405 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2406 [21242] libc: assert gives pedantic warning in old gcc versions
2407 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2408 __regcall calling convention
2409 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2410 [21326] libc: C99 functions are not declared for C++11 and later if
2411 _GNU_SOURCE is not predefined by g++
2412 [21457] libc: sys/ucontext.h namespace
2413 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2414 [21660] math: GCC fails to compile a formula with tgmath.h
2415 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2416 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2417 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2418 [21684] math: tgmath.h handling of complex integers
2419 [21685] math: tgmath.h handling of bit-fields
2420 [21686] math: tgmath.h handling of __int128
2421 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2423 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2425 [21750] localedata: column width of characters incompatible with classical
2427 [21754] malloc: malloc: Perform as little work as possible after heap
2428 consistency check failures
2429 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2430 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2431 [21791] string: Unused XXX_chk_XXX functions in libc.a
2432 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2434 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2436 [21845] localedata: Added new Locale bho_NP
2437 [21853] localedata: Fix abday Which looks same as day in zh_SG
2438 [21854] localedata: Added New Locale en_SC
2439 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2440 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2441 _dl_runtime_resolve_avx_slow
2442 [21885] network: getaddrinfo: gethosts does not release resolver context
2443 on memory allocation failure
2444 [21899] libc: XPG4.2 sigaction namespace
2445 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2447 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2449 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2450 errno value, causing getaddrinfo to fail
2451 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2452 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2453 instead of EAI_NODATA
2454 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2455 constant PTRACE_SEIZE_DEVEL
2456 [21930] math: C-only gcc builtins used in <math.h> isinf
2457 [21932] network: Unpaired __resolv_context_get in generic get*_r
2459 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2460 [21944] libc: sigval namespace
2461 [21951] localedata: Update hanzi collation by stroke
2462 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2463 sysdeps/x86_64/fpu/e_expf.S
2464 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2465 allocation in syscall loops)
2466 [21959] localedata: Fix Country name for xh_ZA
2467 [21960] localedata: Fix abmon for bem_ZM
2468 [21966] math: AVX2 mathvec functions use FMA without checking
2469 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2470 [21971] localedata: Added New Locale for mfe_MU
2471 [21972] libc: assert macro requires operator== (int) for its argument type
2472 [21973] math: [sparc] libm missing sqrtl compat symbol
2473 [21974] libc: Remove __bb_init_func and __bb_exit_func
2474 [21982] string: stratcliff.c: error: assuming signed overflow does not
2476 [21986] stdio: __guess_grouping is called incorrectly
2477 [21987] math: [sparc32] wrong bits/long-double.h installed
2478 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2480 [22022] localedata: Missing country_name for mni_IN
2481 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2483 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2485 [22026] locale: iconv_open: heap overflow on gconv_init failure
2486 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2487 [22035] math: [m68k] bits/math-inline.h macro namespace
2488 [22038] localedata: Fix abbreviated weeks and months for Somali
2489 [22044] localedata: Remove redundant data for Limburgish Language
2490 [22050] malloc: Linking with -lmcheck does not hook
2491 __malloc_initialize_hook correctly
2492 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2493 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2494 [22070] localedata: charmaps/UTF-8: wcwidth for
2495 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2496 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2497 Jungseong and Jongseong) should be 0
2498 [22078] nss: nss_files performance issue in multi mode
2499 [22082] math: bits/math-finite.h exp10 condition
2500 [22086] libc: pcprofiledump incorrect cross-endian condition
2501 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2502 [22095] network: Name server address allocation memory leak in resolv.conf
2504 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2506 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2507 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2509 [22111] malloc: malloc: per thread cache is not returned when thread exits
2510 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2511 [22134] libc: [linux] implement fexecve with execveat
2512 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2514 [22145] libc: ttyname() gives up too early in the face of namespaces
2515 [22146] math: C++ build issue with float128 on x86_64
2516 [22153] nptl: nptl: save error code before process termination
2517 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2518 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2519 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2520 [22165] libc: [hppa] Text relocations in libc.so
2521 [22180] libc: destructor registered via __cxa_atexit is called twice
2522 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2523 symlinks") cause "make" segfaults
2524 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2526 [22207] libc: FAIL: stdlib/test-atexit-race
2527 [22225] math: nearbyint arithmetic moved before feholdexcept
2528 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2529 [22235] math: iscanonical in C++ and float128
2530 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2531 the svid compat wrapper
2532 [22244] math: ynf and yn are wrong without the svid compat wrapper
2533 [22273] libc: Improper assert in Linux posix_spawn implementation
2534 [22284] libc: -pg -pie doesn't work
2535 [22292] locale: localedef exits with error 4 when it should be error 1
2536 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2537 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2539 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2540 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2542 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2543 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2544 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2545 [22322] libc: [mips64] wrong bits/long-double.h installed
2546 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2547 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2549 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2550 [22343] malloc: Integer overflow in posix_memalign
2551 [22347] libc: getrandom() returns the number of bytes that were copied to
2552 the buffer even though the comments say "Return 0 on success and -1 on
2554 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2555 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2557 [22370] dynamic-link: Incorrect note padding check
2558 [22375] libc: malloc returns pointer from tcache_get when should return
2559 NULL (CVE-2017-17426)
2560 [22377] math: iseqsig, float128 and C++
2561 [22382] localedata: Error in tpi_PG locale
2562 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2563 inside the ASCII printable range
2564 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2566 [22403] localedata: Slash needs escaping in some locales
2567 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2568 [22409] network: res_hnok does not accept some host names used on the
2570 [22412] network: res_dnok, res_hnok should perform syntax checks
2571 [22413] network: ns_name_pton ignores syntactically invalid trailing
2573 [22415] stdio: setvbuf can lead to invalid free/segfault
2574 [22432] build: Non-deterministic build
2575 [22439] malloc: malloc_info should compute summary statistics for all sub-
2577 [22442] network: if_nametoindex could report index for the wrong
2578 networking interface
2579 [22446] build: aliasing violation calling readlink in handle_request
2580 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2581 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2582 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2583 __nscd_hash/__nss_hash
2584 [22463] network: p_secstodate overflow handling
2585 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2586 [22478] libc: sigwait can fail with EINTR
2587 [22505] libc: ldconfig processes include directive in locale-specific
2589 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2590 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2591 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2592 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2593 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2594 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2595 same as for Croatian
2596 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2597 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2598 [22577] libc: missing newline after "cannot allocate TLS data structures
2600 [22588] manual: manual/conf.texi: missing underscore in front of
2602 [22593] math: nextafter and nexttoward are declared with const attribute
2603 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2604 [22603] string: ia64 memchr overflows internal pointer check
2605 [22605] libc: SH clone does not set the exit code correctly
2606 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2608 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2609 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2610 modified in case of success
2611 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2612 [22615] manual: manual: ambiguous wording about errno value in case of
2614 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2616 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2617 binaries or if /proc is not mounted (CVE-2017-16997)
2618 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2619 [22630] build: $(no-pie-ldflag) is no longer effective
2620 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2621 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2622 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2623 [22637] nptl: guard size is subtracted from thread stack size instead of
2625 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2626 [22657] localedata: hu_HU: Avoid double space in date
2627 [22660] math: fmax, fmin sNaN handling on alpha
2628 [22664] libc: New warning of GCC8
2629 [22665] math: alpha: ceil and floor raise inexact exceptions
2630 [22666] math: alpha: trunc raise inexact exceptions
2631 [22667] libc: makecontext lacks stack alignment on i386
2632 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2633 [22679] libc: getcwd(3) can succeed without returning an absolute path
2635 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2636 elision and tunables
2637 [22687] math: [powerpc-nofpu] complex long double functions spurious
2639 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2640 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2641 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2643 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2644 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2646 [22701] nis: Incomplete removal of libnsl
2647 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2648 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2649 [22715] dynamic-link: FAIL: elf/tst-audit10
2650 [22719] libc: Backtrace tests fail on hppa
2651 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2652 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2653 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2654 before the first call to crypt_r () in crypt/badsalttest.c
2661 * A per-thread cache has been added to malloc. Access to the cache requires
2662 no locks and therefore significantly accelerates the fast path to allocate
2663 and free small amounts of memory. Refilling an empty cache requires locking
2664 the underlying arena. Performance measurements show significant gains in a
2665 wide variety of user workloads. Workloads were captured using a special
2666 instrumented malloc and analyzed with a malloc simulator. Contributed by
2667 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2669 * Unicode 10.0.0 Support: Character encoding, character type info, and
2670 transliteration tables are all updated to Unicode 10.0.0, using
2671 generator scripts contributed by Mike FABIAN (Red Hat).
2672 These updates cause user visible changes, especially the changes in
2673 wcwidth for many emoji characters cause problems when emoji sequences
2674 are rendered with pango, see for example:
2675 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2677 * Collation of Hungarian has been overhauled and is now consistent with "The
2678 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2681 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2683 - The GNU C Library will now detect when /etc/resolv.conf has been
2684 modified and reload the changed configuration. The new resolver option
2685 “no-reload” (RES_NORELOAD) disables this behavior.
2687 - The GNU C Library now supports an arbitrary number of search domains
2688 (configured using the “search” directive in /etc/resolv.conf);
2689 previously, there was a hard limit of six domains. For backward
2690 compatibility, applications that directly modify the ‘_res’ global
2691 object are still limited to six search domains.
2693 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2694 Library will now randomly pick a name server from the configuration as a
2695 starting point. (Previously, the second name server was always used.)
2697 * The tunables feature is now enabled by default. This allows users to tweak
2698 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2700 * New function reallocarray, which resizes an allocated block (like realloc)
2701 to the product of two sizes, with a guaranteed clean failure upon integer
2702 overflow in the multiplication. Originally from OpenBSD, contributed by
2703 Dennis Wölfing and Rüdiger Sonderfeld.
2705 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2706 These are extended versions of preadv and pwritev, respectively, taking an
2707 additional flags argument. The set of supported flags depends on the
2708 running kernel; full support currently requires kernel 4.7 or later.
2710 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2711 create a new session ID for the spawned process. This feature is
2712 scheduled to be added to the next major revision of POSIX; for the time
2713 being, it is available under _GNU_SOURCE.
2715 * errno.h is now safe to use from C-preprocessed assembly language on all
2716 supported operating systems. In this context, it will only define the
2717 Exxxx constants, as preprocessor macros expanding to integer literals.
2719 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2720 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2721 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2722 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2724 To compile programs that use this feature, the compiler must support
2725 128-bit floating point with the type name _Float128 (as defined by TS
2726 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2727 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2728 must be defined to make the new interfaces visible.
2730 The new functions and macros correspond to those present for other
2731 floating-point types (except for a few obsolescent interfaces not
2732 supported for the new type), with F128 or f128 suffixes; for example,
2733 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2734 printf or scanf formats for the new type; the strfromf128 and strtof128
2735 interfaces should be used instead.
2737 Deprecated and removed features, and other changes affecting compatibility:
2739 * The synchronization that pthread_spin_unlock performs has been changed to
2740 now be equivalent to a C11 atomic store with release memory order to the
2741 spin lock's memory location. Previously, several (but not all)
2742 architectures used stronger synchronization (e.g., containing what is
2743 often called a full barrier). This change can improve performance, but
2744 may affect odd fringe uses of spin locks that depend on the previous
2745 behavior (e.g., using spin locks as atomic variables to try to implement
2746 Dekker's mutual exclusion algorithm).
2748 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2751 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2752 will only be built and installed when the GNU C Library is configured with
2753 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2754 as TIRPC or rpcsvc-proto, to be used.
2756 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2757 libnss_compat, are deprecated, and will not be built or installed by
2760 The NIS(+) support library, libnsl, is also deprecated. By default, a
2761 compatibility shared library will be built and installed, but not headers
2762 or development libraries. Only a few NIS-related programs require this
2763 library. (In particular, the GNU C Library has never required programs
2764 that use 'gethostbyname' to be linked with libnsl.)
2766 Replacement implementations based on TIRPC, which additionally support
2767 IPv6, are available from <https://github.com/thkukuk/>. The configure
2768 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2769 name service modules, to be built and installed.
2771 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2772 support is enabled, the configured recursive resolver must support EDNS.
2773 (Responding to EDNS-enabled queries with responses which are not
2774 EDNS-enabled is fine, but FORMERR responses are not.)
2776 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2777 servers have not supported this opcode for a long time.
2779 * The _res_opcodes variable has been removed from libresolv. It had been
2780 exported by accident.
2782 * <string.h> no longer includes inline versions of any string functions,
2783 as this kind of optimization is better done by the compiler. The macros
2784 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2786 * The nonstandard header <xlocale.h> has been removed. Most programs should
2787 use <locale.h> instead. If you have a specific need for the definition of
2788 locale_t with no other declarations, please contact
2789 libc-alpha@sourceware.org and explain.
2791 * The obsolete header <sys/ultrasound.h> has been removed.
2793 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2795 * The obsolete function cfree has been removed. Applications should use
2798 * The stack_t type no longer has the name struct sigaltstack. This changes
2799 the C++ name mangling for interfaces involving this type.
2801 * The ucontext_t type no longer has the name struct ucontext. This changes
2802 the C++ name mangling for interfaces involving this type.
2804 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2805 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2806 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2807 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2808 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2809 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2810 fpregset_t type no longer has the name struct fpu. This changes the C++
2811 name mangling for interfaces involving those types.
2813 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2814 synced with the kernel:
2816 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2817 are not supported on this architecture and have been removed.
2819 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2820 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2821 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2823 Programs that assume the GET/SETREGS ptrace requests are universally
2824 available will now fail to build, instead of malfunctioning at runtime.
2826 Changes to build and runtime requirements:
2828 * Linux kernel 3.2 or later is required at runtime, on all architectures
2829 supported by that kernel. (This is a change from version 2.25 only for
2832 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2834 * On most architectures, GCC 4.9 or later is required to build the GNU C
2835 Library. On powerpc64le, GCC 6.2 or later is required.
2837 Older GCC versions and non-GNU compilers are still supported when
2838 compiling programs that use the GNU C Library. (We do not know exactly
2839 how old, and some GNU extensions to C may be _de facto_ required. If you
2840 are interested in helping us make this statement less vague, please
2841 contact libc-alpha@sourceware.org.)
2843 Security related changes:
2845 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2846 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2848 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2849 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2851 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2852 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2855 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2856 fixed (CVE-2017-12133).
2858 The following bugs are resolved with this release:
2860 [984] network: Respond to changed resolv.conf in gethostbyname
2861 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2862 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2864 [12189] libc: __stack_chk_fail should not attempt a backtrace
2866 [14096] time: Race condition on timezone/tst-timezone.out
2867 [14172] localedata: az_IR: new locale
2868 [14995] build: glibc fails to build if gold is the default linker, even if
2870 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2871 [16637] network: inet_pton function is accepting IPv6 with bad format
2872 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2873 x86 and other generic code
2874 [16875] localedata: ko_KR: fix lang_name
2875 [17225] localedata: ar_SY: localized month names for May and June are
2877 [17297] localedata: da_DK: wrong date_fmt string
2878 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2879 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2880 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2881 [19066] localedata: ar_SA abbreviated day and month names are in English
2882 [19569] network: resolv: Support an arbitrary number of search domains
2883 [19570] network: Implement random DNS server selection in the stub
2885 [19838] locale: localedef fails on PA-RISC
2886 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2887 order of 0D36 and 0D37
2888 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2890 [20098] libc: FAIL: debug/backtrace-tst on hppa
2891 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2893 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2895 [20313] localedata: Update locale data to Unicode 9.0
2896 [20424] manual: Document how to provide a malloc replacement
2897 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2899 [20686] locale: Add el_GR@euro to SUPPORTED.
2900 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2901 failures consistently
2902 [21015] dynamic-link: Document and fix --enable-bind-now
2903 [21016] nptl: pthread_cond support is broken on hppa
2904 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2905 frame-pointer on i386
2906 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2908 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2909 [21088] libc: Build fails with --enable-static-nss
2910 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2911 generic c code is used
2912 [21109] libc: Tunables broken on big-endian
2913 [21112] math: powf has large ulp errors with base close to 1 and exponent
2915 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2917 [21120] malloc: glibc malloc is incompatible with GCC 7
2918 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2920 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2921 (-0.0) when linking with -lieee
2922 [21171] math: log10, log2 and lgamma return incorrect results
2923 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2924 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2925 [21207] localedata: ce_RU: update weekdays from CLDR
2926 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2927 [21217] localedata: Update months from CLDR-31
2928 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2929 [21243] libc: support_delete_temp_file should issue warning for failed
2931 [21244] libc: support resolv_test_start() socket fd close should be
2933 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2934 new posix_spawn implementation
2935 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2936 leads to lower CPU frequency
2937 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2938 [21261] libc: [sparc64] bits/setjmp.h namespace
2939 [21267] network: [mips] bits/socket.h IOC* namespace
2940 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2941 [21270] libc: mmap64 silently truncates large offset values
2942 [21275] libc: posix_spawn always crashes on ia64 now
2943 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2944 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2945 [21289] libc: Incorrect declaration for 32-bit platforms with
2946 _FILE_OFFSET_BITS=64 causes build error
2947 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2948 not support gethostbyname4_r
2949 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2951 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2953 [21340] libc: Support POSIX_SPAWN_SETSID
2954 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2955 [21359] network: ns_name_pack needs additional byte in destination buffer
2956 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2957 against fragmentation attacks (CVE-2017-12132)
2958 [21369] network: resolv: Remove EDNS fallback
2959 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2961 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2962 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2963 [21393] stdio: Missing dup3 error check in freopen, freopen64
2964 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2965 [21399] localedata: Bad description for U00EC in
2966 localedata/charmaps/CP1254
2967 [21411] malloc: realloc documentation error
2968 [21426] network: sys/socket.h uio.h namespace
2969 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2970 [21445] libc: signal.h bsd_signal namespace
2971 [21455] network: Network headers stdint.h namespace
2972 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2974 [21475] network: resolv: Overlong search path is truncated mid-label
2975 [21511] libc: sigstack namespace
2976 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2977 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2978 bits/syscall.h: No such file or directory
2979 [21517] libc: struct sigaltstack namespace
2980 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2981 [21533] localedata: Update locale data to Unicode 10.0
2983 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2984 junk at end of line, first unrecognized character is `@'
2985 [21538] libc: SIG_HOLD missing for XPG4
2986 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2987 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2988 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2989 [21543] libc: sigevent namespace
2990 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2991 size for general purpose registers in mcontext_t structure
2992 [21550] libc: sigwait namespace
2993 [21552] libc: XPG4 bsd_signal namespace
2994 [21554] libc: sigpause namespace
2995 [21560] libc: sys/wait.h signal.h namespace
2996 [21561] libc: waitid namespace
2997 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2998 '/usr/include/stdlib.h': Permission denied
2999 [21575] libc: sys/wait.h missing struct rusage definition
3000 [21584] libc: sigaltstack etc namespace
3001 [21597] libc: siginterrupt namespace
3002 [21607] math: hppa: FAIL: math/test-tgmath
3003 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3005 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3006 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3007 stack and heap (CVE-2017-1000366)
3008 [21625] libc: wait3 namespace
3009 [21654] nss: Incorrect pointer alignment in NSS group merge result
3011 [21657] network: Parse interface zone id for node-local multicast
3012 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3014 [21666] libc: .symver is used on common symbol
3015 [21668] network: resolv: res_init cross-thread broadcast introduces race
3017 [21687] math: tgmath.h totalorder, totalordermag return type
3018 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3020 [21696] libc: Incorrect assumption of of __cpu_mask in
3021 posix/sched_cpucount.c
3022 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3023 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3025 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3026 leading to relocation crash
3027 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3028 `resolv_conf_matches (resp, conf)' failed.
3029 [21710] localedata: Added Samoan language locale for Samoa
3030 [21711] localedata: Pashto yesstr/nostr locale are missing
3031 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3032 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3033 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3034 [21723] localedata: yesstr/nostr missing for Chinese language locale
3035 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3037 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3039 [21728] localedata: New Locale for Tongan language
3040 [21729] localedata: incorrect LC_NAME fields for hi_IN
3041 [21733] localedata: yesstr and nostr are missing for zh_HK
3042 [21734] localedata: Missing yesstr and nostr are for kw_GB
3043 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3044 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3045 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3046 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3048 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3050 [21749] localedata: Wrong abbreviated day name (“abday”) for
3052 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3053 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3054 [21759] localedata: missing yesstr and nostr for Tigrinya
3055 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3056 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3057 [21767] localedata: Missing Bislama locales
3058 [21768] localedata: Missing yesstr and nostr for aa_ET
3059 [21770] localedata: Missing Field in li_NL
3060 [21778] nptl: Robust mutex may deadlock
3061 [21779] libc: MicroBlaze segfaults when loading libpthread
3062 [21783] localedata: Fix int_select international_call_prefixes
3063 [21784] localedata: Inconsistency in country_isbn
3064 [21788] localedata: Missing Country Postal Abbreviations
3065 [21794] localedata: Added-country_isbn-for-Italy
3066 [21795] localedata: Add/Fix country_isbn for France
3067 [21796] localedata: Added country_isbn for Republic of Korea
3068 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3069 [21799] localedata: Added int_select international_call_prefixes
3070 [21801] localedata: Added int_select international_call_prefixes
3071 [21804] nptl: Double semicolon in thread-shared-types.h
3072 [21807] localedata: LC_ADDRESS fix for pap_CW
3073 [21808] localedata: Fix LC_ADDRESS for pap_AW
3074 [21821] localedata: Added country_name in mai_IN
3075 [21822] localedata: Fix LC_TIME for mai_IN
3076 [21823] localedata: missing yesstr, nostr for sa_IN
3077 [21825] localedata: Fix name_mrs for mag_IN
3078 [21828] localedata: 2.26 changelog should mention user visible changes
3080 [21835] localedata: Added Maithili language locale for Nepal
3081 [21838] localedata: Removed redundant data for the_NP
3082 [21839] localedata: Fix LC_MONETARY for ta_LK
3083 [21844] localedata: Fix Latin characters and Months Sequence.
3084 [21848] localedata: Fix mai_NP Title Name
3089 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3090 24731-2:2010, is supported to enable declarations of functions from that
3091 TR. Note that not all functions from that TR are supported by the GNU C
3094 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3095 18661-1:2014, is supported to enable declarations of functions and macros
3096 from that TS. Note that not all features from that TS are supported by
3099 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3100 18661-4:2015, is supported to enable declarations of functions and macros
3101 from that TS. Note that most features from that TS are not supported by
3104 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3105 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3106 Since the GNU C Library defaults to a much newer revision of POSIX, this
3107 will only affect programs that specifically request an old conformance
3108 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3109 see a change in the visible declarations, but a program compiled with
3110 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3113 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3114 defined by all multithreaded code, but glibc has not required this for
3117 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3118 means that in a future release, the macros “major”, “minor”, and “makedev”
3119 will only be available from <sys/sysmacros.h>.
3121 These macros are not part of POSIX nor XSI, and their names frequently
3122 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3123 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3124 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3127 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3128 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3129 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3131 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3132 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3133 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3134 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3135 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3136 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3137 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3138 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3139 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3140 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3141 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3144 * New <math.h> features are added from TS 18661-1:2014:
3146 - Signaling NaN macros: SNANF, SNAN, SNANL.
3148 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3149 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3150 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3152 - llogb functions: the llogb, llogbf and llogbl functions, and the
3153 FP_LLOGB0 and FP_LLOGBNAN macros.
3155 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3158 - Comparison macros: iseqsig.
3160 - Classification macros: iscanonical, issubnormal, iszero.
3162 - Total order functions: totalorder, totalorderf, totalorderl,
3163 totalordermag, totalordermagf, totalordermagl.
3165 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3167 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3168 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3170 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3171 are added to libc. They convert a floating-point number into string.
3173 * Most of glibc can now be built with the stack smashing protector enabled.
3174 It is recommended to build glibc with --enable-stack-protector=strong.
3175 Implemented by Nick Alcock (Oracle).
3177 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3178 intended to be used instead of memset() to erase sensitive data after use;
3179 the compiler will not optimize out calls to explicit_bzero even if they
3180 are "unnecessary" (in the sense that no _correct_ program can observe the
3181 effects of the memory clear).
3183 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3184 to float instead of double. This does not affect the ABI of any libraries
3185 that are part of the GNU C Library, but may affect the ABI of other
3186 libraries that use this type in their interfaces.
3188 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3189 float_t and double_t types are now defined to long double instead of float
3190 and double. These options are not the default, and this does not affect
3191 the ABI of any libraries that are part of the GNU C Library, but it may
3192 affect the ABI of other libraries that use this type in their interfaces,
3193 if they are compiled or used with those options.
3195 * The getentropy and getrandom functions, and the <sys/random.h> header file
3198 * The buffer size for byte-oriented stdio streams is now limited to 8192
3199 bytes by default. Previously, on Linux, the default buffer size on most
3200 file systems was 4096 bytes (and thus remains unchanged), except on
3201 network file systems, where the buffer size was unpredictable and could be
3202 as large as several megabytes.
3204 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3205 for the Linux quota interface which predates kernel version 2.4.22 has
3208 * The malloc_get_state and malloc_set_state functions have been removed.
3209 Already-existing binaries that dynamically link to these functions will
3210 get a hidden implementation in which malloc_get_state is a stub. As far
3211 as we know, these functions are used only by GNU Emacs and this change
3212 will not adversely affect already-built Emacs executables. Any undumped
3213 Emacs executables, which normally exist only during an Emacs build, should
3214 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3216 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3217 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3218 “no-ip6-dotint” had already been the default, and support for the
3219 “ip6-dotint” option was removed from the Internet in 2006.
3221 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3222 flag from <resolv.h> have been removed. The option relied on a
3223 backwards-incompatible DNS extension which was never deployed on the
3226 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3227 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3228 They were already unimplemented.
3230 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3231 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3232 removed again from the IETF name lookup interface specification in RFC
3233 2553. Applications should use getaddrinfo instead.
3235 * DNSSEC-related declarations and definitions have been removed from the
3236 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3237 decode the data part of DNSSEC record types. Previous versions of glibc
3238 only implemented minimal support for the previous version of DNSSEC, which
3239 is incompatible with the currently deployed version.
3241 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3242 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3243 <arpa/nameser.h> header file because the distinction between RR types and
3244 meta-RR types is not officially standardized, subject to revision, and
3245 thus not suitable for encoding in a macro.
3247 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3248 and rhook members of the res_state type in <resolv.h> have been removed.
3249 The glibc stub resolver did not support these hooks, but the header file
3250 did not reflect that.
3252 * For multi-arch support it is recommended to use a GCC which has
3253 been built with support for GNU indirect functions. This ensures
3254 that correct debugging information is generated for functions
3255 selected by IFUNC resolvers. This support can either be enabled by
3256 configuring GCC with '--enable-gnu-indirect-function', or by
3257 enabling it by default by setting 'default_gnu_indirect_function'
3258 variable for a particular architecture in the GCC source file
3261 * GDB pretty printers have been added for mutex and condition variable
3262 structures in POSIX Threads. When installed and loaded in gdb these pretty
3263 printers show various pthread variables in human-readable form when read
3264 using the 'print' or 'display' commands in gdb.
3266 * Tunables feature added to allow tweaking of the runtime for an application
3267 program. This feature can be enabled with the '--enable-tunables' configure
3268 flag. The GNU C Library manual has details on usage and README.tunables has
3269 instructions on adding new tunables to the library.
3271 * A new version of condition variables functions have been implemented in
3272 the NPTL implementation of POSIX Threads to provide stronger ordering
3275 * A new version of pthread_rwlock functions have been implemented to use a more
3276 scalable algorithm primarily through not using a critical section anymore to
3279 Security related changes:
3281 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3282 have been created with makecontext could fail to terminate due to a
3283 missing .cantunwind annotation. This has been observed to lead to a hang
3284 (denial of service) in some Go applications compiled with gccgo. Reported
3285 by Andreas Schwab. (CVE-2016-6323)
3287 * The DNS stub resolver functions would crash due to a NULL pointer
3288 dereference when processing a query with a valid DNS question type which
3289 was used internally in the implementation. The stub resolver now uses a
3290 question type which is outside the range of valid question type values.
3293 The following bugs are resolved with this release:
3295 [4099] stdio: Overly aggressive caching by stream i/o functions.
3296 [7065] build: Support building glibc with -fstack-protector or -fstack-
3298 [9842] localedata: en_CA: incorrect date format
3299 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3300 before it started waiting
3301 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3302 [15765] nptl: sem_open is wrongly a cancellation point
3303 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3304 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3306 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3307 library linked with pthread
3308 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3309 "FIXME: Ingo" issue)
3310 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3311 [17252] libc: getrandom and getentropy syscall
3312 [17730] malloc: thread-local storage is sometimes improperly free()'d
3313 after being __libc_memalign()'d
3314 [18241] stdio: failed fseek on memstream does not set errno and can fail
3316 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3318 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3319 PTHREAD_PRIO_INHERIT mutex on ARM
3320 [18784] network: res_query and related function crash for special record
3321 type queries (CVE-2015-5180)
3322 [19380] math: strtod does not raise "inexact"
3323 [19387] string: Integer overflow in memchr
3324 [19390] string: Integer overflow in strncat
3325 [19398] build: linknamespace tests fail with massively parallel build
3326 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3328 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3329 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3330 [19514] libc: [PATCH] Fix spelling errors in spelling
3331 "implement"/"implementation" in several places
3332 [19582] network: Deprecate RES_USE_INET6
3333 [19673] manual: clog10 docs appear to be erroneous
3334 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3335 causes a segmentation fault
3336 [19826] libc: invalid pointer returned from __tls_get_addr with static
3338 [20016] network: resolv: Remove hooks support from the API
3339 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3341 [20033] math: [x86_64] vectorized math function don't call the __finite
3343 [20116] nptl: use after free in pthread_create
3344 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3345 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3347 [20311] nptl: please install proc_service.h
3348 [20366] libc: Compilation errors in installed headers in strict-compliance
3350 [20370] malloc: malloc: Arena free list management is still racy
3351 (incorrect fix in bug 19243)
3352 [20386] libc: assert (X = 0) does not result in GCC warning
3353 [20432] malloc: malloc: Minimize interface required for interposition
3354 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3355 in _Unwind_Backtrace (CVE-2016-6323)
3356 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3357 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3359 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3360 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3361 [20477] network: resolv: incorrect double-checked locking related to
3363 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3365 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3367 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3368 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3369 cause transition penalty
3370 [20517] math: sparcv9 missing fdiml compat symbol
3371 [20524] manual: strverscmp is inconsistent
3372 [20525] libc: <sys/quota.h> should be based on kernel headers
3373 [20539] math: GCC 7 -static -lm fails to link at -O3
3374 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3376 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3378 [20591] network: Remove obsolete DNSSEC support
3379 [20592] network: DNS resource record type classification macros in
3380 <arpa/nameser.h> are incorrect
3381 [20593] network: Update DNS RR type definitions
3382 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3383 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3385 [20629] network: libresolv: Remove support for bitstring labels
3387 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3388 assertion: "maxidx >= 2"
3389 [20660] math: [arm] Use VSQRT
3390 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3391 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3392 [20689] libc: Test for FMA should also check for AVX.
3393 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3394 [20715] math: iszero macro breaks existing code
3395 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3396 [20728] libc: powerpc: Missing TOC stub in clone
3397 [20729] build: glibc-2.24 fails to build for i486 with -Os
3398 [20750] build: Build fails with default PIE enabled gcc-6.x
3399 [20768] math: [alpha] sqrt fegetenv namespace
3400 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3402 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3403 __FLT_EVAL_METHOD__ is 2
3404 [20790] network: rpcgen buffer overrun in get_prog_declaration
3405 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3406 [20829] libc: crypt snprintf namespace
3407 [20847] libc: tst-vfork3 failure
3408 [20855] math: Default bits/mathdef.h has inappropriate float_t
3409 [20859] math: [sh4] FP_ILOGB0 invalid
3410 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3411 U+20AC), not same as GBK
3412 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3413 [20916] math: pow handling of sNaN arguments
3414 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3415 [20919] math: Bad pow (qNaN, 0) result with -lieee
3416 [20940] math: hypot sNaN handling
3417 [20947] math: fmax, fmin sNaN handling
3418 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3419 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3421 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3422 [20973] nptl: robust mutexes: Lost wake-ups
3423 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3424 [20978] nis: strlen on null pointer in nss_nisplus
3425 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3427 [21014] string: i686 memchr overflows internal pointer check
3428 [21019] libc: [mips] n32 lseek incorrect on overflow
3429 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3430 [21026] libc: [MIPS] readahead syscall is broken on n64
3431 [21028] math: Fallback fesetexceptflag should always succeed
3432 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3433 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3435 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3436 [21061] librt: [microblaze] librt lost clock_* exports
3437 [21073] libc: tunables: insecure environment variables passed to
3438 subprocesses with AT_SECURE
3439 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3443 * The minimum Linux kernel version that this version of the GNU C Library
3444 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3445 kernel version 2.6.32 or later suffices (on architectures that already
3446 required kernel versions more recent than 3.2, those requirements remain
3447 unchanged). Linux 3.2 or later kernel headers are required on all
3450 * The pap_AN locale has been deleted. This has been deprecated for a long
3451 time. It has been replaced by pap_AW & pap_CW, both of which have long
3452 been included in previous releases.
3454 * The readdir_r and readdir64_r functions have been deprecated. It is
3455 recommended to use readdir and readdir64 instead.
3457 * The type “union wait” has been removed. It was deprecated in the early
3458 1990s and never part of POSIX. Application code should use the int type
3459 instead of “union wait”.
3461 * A new NSS action is added to facilitate large distributed system
3462 administration. The action, MERGE, allows remote user stores like LDAP
3463 to be merged into local user stores like /etc/groups in order to provide
3464 easy to use, updated, and managed sets of merged credentials. The new
3465 action can be used by configuring it in /etc/nsswitch.conf:
3466 group: files [SUCCESS=merge] nis
3467 Implemented by Stephen Gallagher (Red Hat).
3469 * The deprecated __malloc_initialize_hook variable has been removed from the
3472 * The long unused localedef --old-style option has been removed. It hasn't
3473 done anything in over 16 years. Scripts using this option can safely
3476 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3477 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3478 return the next representable value in the direction of positive infinity
3479 and the nextdown functions return the next representable value in the
3480 direction of negative infinity. These are currently enabled as GNU
3483 Security related changes:
3485 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3486 could result in a stack overflow when getnetbyname was called with an
3487 overly long name. (CVE-2016-3075)
3489 * Previously, getaddrinfo copied large amounts of address data to the stack,
3490 even after the fix for CVE-2013-4458 has been applied, potentially
3491 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3492 instead. Reported by Michael Petlan. (CVE-2016-3706)
3494 * The glob function suffered from a stack-based buffer overflow when it was
3495 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3496 Reported by Alexander Cherepanov. (CVE-2016-1234)
3498 * The Sun RPC UDP client could exhaust all available stack space when
3499 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3500 alloca plugin for GCC. (CVE-2016-4429)
3502 * The IPv6 name server management code in libresolv could result in a memory
3503 leak for each thread which is created, performs a failing naming lookup,
3504 and exits. Over time, this could result in a denial of service due to
3505 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3507 The following bugs are resolved with this release:
3509 [1170] localedata: ne_NP: update Nepali locale definition file
3510 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3512 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3513 [6796] math: fdim() does not set errno on overflow
3514 [10354] libc: posix_spawn should use vfork() in more cases than presently
3515 [11213] localedata: localedata: add copyright disclaimer to locale files
3516 [12143] localedata: chr_US: new Cherokee locale
3517 [12450] localedata: sgs_LT: new locale
3518 [12676] localedata: ln_CD: new locale
3519 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3521 [13304] math: fma, fmaf, fmal produce wrong results
3522 [14259] build: --localedir arg to configure is ignored
3523 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3524 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3525 [14934] localedata: es_CL: wrong first weekday chilean locale
3526 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3528 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3530 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3531 [15368] nptl: raise() is not async-signal-safe
3532 [15479] math: ceil, floor, round and trunc raise inexact exception
3533 [15578] localedata: kk_KZ: various updates
3534 [16003] localedata: pap_AN: punt old locale
3535 [16137] localedata: iw_IL: punt old locale
3536 [16190] localedata: eo: new esperanto locale
3537 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3538 [16742] malloc: race condition: pthread_atfork() called before first
3539 malloc() results in unexpected locking behaviour/deadlocks
3540 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3542 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3543 [17565] localedata: pt_PT: wrong (work-)week start
3544 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3545 [17950] build: Build fails with -msse
3546 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3547 [18433] libc: posix_spawn does not return correctly upon failure to
3549 [18453] localedata: charmaps/IBM875: incorrect codes
3550 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3552 [18896] localedata: he_IL: improvements for currency
3553 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3554 Romanian locale data
3555 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3557 [19056] libc: Deprecate readdir_r
3558 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3560 [19198] localedata: nl_NL: small improvements for Dutch locales
3561 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3562 nameservers (CVE-2016-5417)
3563 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3565 [19400] locale: Language missing in "iso-639.def", trivial fix in
3567 [19431] malloc: Deadlock between fflush, getdelim, and fork
3568 [19505] libc: Incorrect file descriptor validity checks in
3569 posix_spawn_file_actions_add{open,close,dup2}
3570 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3571 when using RTLD_NEXT
3572 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3573 `intl/{gettextP,loadinfo}.h'
3574 [19534] libc: execle, execlp may use malloc
3575 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3576 [19573] network: res_nclose and __res_maybe_init disagree about name
3577 server initialization, breaking Hesiod
3578 [19575] localedata: Status of GB18030 tables
3579 [19581] localedata: sr_* date_fmt string contains additional newline
3580 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3582 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3583 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3584 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3585 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3587 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3589 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3591 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3592 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3593 [19633] locale: strfmon_l applies global locale to number formatting
3594 [19642] network: Memory leak in getnameinfo
3595 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3596 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3598 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3599 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3601 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3602 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3604 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3606 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3608 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3609 pointers and lengths in error-case.
3610 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3611 report errors on UTF-16 surrogates values.
3612 [19755] nscd: nscd assertion failure in gc
3613 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3614 [19759] libc: mempcpy shouldn't be inlined
3615 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3616 [19765] libc: s390 needs an optimized mempcpy
3617 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3618 NAME_MAX limit assumption (CVE-2016-1234)
3619 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3620 [19787] network: Missing and incorrect truncation checks in getnameinfo
3621 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3623 [19791] network: Assertion failure in res_query.c with un-connectable name
3625 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3626 [19822] math: libm.so install clobbers old version
3627 [19825] network: resolv: send_vc can return uninitialized data in second
3628 response to getaddrinfo
3629 [19830] network: nss_dns: should check RDATA length against buffer length
3630 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3631 confronted with A/AAAA records of invalid size
3632 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3633 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3634 [19853] stdio: Printing IBM long double in decimal with high precision is
3636 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3637 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3638 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3640 [19865] network: Assertion failure or memory leak in
3641 _nss_dns_getcanonname_r
3642 [19868] network: nss_dns: netent code does not skip over non-PTR records
3643 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3645 [19881] string: Improve x86-64 memset
3646 [19907] string: Incorrect memcpy tests
3647 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3649 [19925] libc: termios.h XCASE namespace
3650 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3651 [19929] libc: limits.h NL_NMAX namespace
3652 [19931] stdio: Memory leak in vfprintf
3653 [19957] libc: clone(CLONE_VM) access invalid parent memory
3654 [19963] localedata: en_IL: New locale
3655 [19989] stdio: stdio.h cuserid namespace
3656 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3658 [19996] locale: langinfo.h nl_langinfo_l namespace
3659 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3660 [20010] network: getaddrinfo: Stack overflow in hostent translation
3662 [20012] stdio: libio: fmemopen append mode failure
3663 [20014] stdio: stdio.h namespace for pre-threads POSIX
3664 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3665 [20023] libc: fcntl.h timespec namespace
3666 [20024] math: [x86_64] vectorized sincos trashes the stack
3667 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3668 [20041] time: sys/time.h timespec namespace
3669 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3670 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3671 [20051] libc: ttyslot in wrong header under wrong conditions
3672 [20054] libc: gethostname not declared for XPG4
3673 [20055] libc: termios.h missing tcgetsid for XPG4
3674 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3676 [20073] libc: sys/stat.h fchmod namespace
3677 [20074] libc: stdlib.h rand_r namespace
3678 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3679 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3681 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3682 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3684 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3685 [20119] libc: Wrong mask for processors level type from CPUID
3686 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3687 AS not supporting AVX512
3688 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3690 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3691 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3693 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3694 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3695 [20178] libc: posix_spawn{p} should not call exit
3696 [20191] stdio: libio: vtables hardening
3697 [20195] string: FMA4 detection requires CPUID execution with register
3699 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3700 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3702 [20212] math: acos (sNaN) returns sNaN
3703 [20213] math: asin (sNaN) returns sNaN
3704 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3705 [20218] math: [i386] asinhl (sNaN) returns sNaN
3706 [20219] math: [i386] atanhl (sNaN) returns sNaN
3707 [20222] stdio: fopencookie: Mangle function pointers
3708 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3709 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3710 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3712 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3713 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3714 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3715 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3716 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3717 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3718 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3719 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3720 [20240] math: modf (sNaN) returns sNaN
3721 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3722 [20250] math: frexp (sNaN) returns sNaN
3723 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3724 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3726 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3727 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3728 subscript is below array bounds [-Werror=array-bounds]
3729 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3730 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3732 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3733 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3735 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3736 "invalid" exceptions
3737 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3738 [20316] localedata: id_ID: Februari instead of Pebruari
3739 [20327] string: POWER8 strcasecmp returns incorrect result
3740 [20347] math: Failure: Test: j0_downward (0xap+0)
3741 [20348] libc: FAIL: misc/tst-preadvwritev64
3742 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3743 [20350] libc: There is no test for p{read,write}64
3744 [20357] math: Incorrect cos result for 1.5174239687223976
3745 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3749 * Unicode 8.0.0 Support: Character encoding, character type info, and
3750 transliteration tables are all updated to Unicode 8.0.0, using new
3751 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3752 These updates cause user visible changes, such as the fixes for bugs
3753 89, 16061, and 18568.
3755 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3756 kernel-internal CPU set size. This means that requests that change the
3757 CPU affinity which failed before (for example, an all-ones CPU mask) will
3758 now succeed. Applications that need to determine the effective CPU
3759 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3760 setting it because the kernel can adjust it (and the previous size check
3761 would not detect this in the majority of cases).
3763 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3764 the following new symbols are used: fts64_children, fts64_close,
3765 fts64_open, fts64_read and fts64_set.
3767 * getaddrinfo now detects certain invalid responses on an internal netlink
3768 socket. If such responses are received, an affected process will
3769 terminate with an error message of "Unexpected error <number> on netlink
3770 descriptor <number>" or "Unexpected netlink response of size <number> on
3771 descriptor <number>". The most likely cause for these errors is a
3772 multi-threaded application which erroneously closes and reuses the netlink
3773 file descriptor while it is used by getaddrinfo.
3775 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3776 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3777 unnecessary serialization of memory allocation requests across threads.
3778 The defect is now corrected. Users should see a substantial increase in
3779 the concurent throughput of allocation requests for applications which
3780 trigger this bug. Affected applications typically create and
3781 destroy threads frequently. (Bug 19048 was reported and analyzed by
3784 * There is now a --disable-timezone-tools configure option for disabling the
3785 building and installing of the timezone related utilities (zic, zdump, and
3786 tzselect). This is useful for people who build the timezone data and code
3787 independent of the GNU C Library.
3789 * The obsolete header <regexp.h> has been removed. Programs that require
3790 this header must be updated to use <regex.h> instead.
3792 * The obsolete functions bdflush, create_module, get_kernel_syms,
3793 query_module and uselib are no longer available to newly linked binaries;
3794 the header <sys/kdaemon.h> has been removed. These functions and header
3795 were specific to systems using the Linux kernel and could not usefully be
3796 used with the GNU C Library on systems with version 2.6 or later of the
3799 * Optimized string, wcsmbs and memory functions for IBM z13.
3800 Implemented by Stefan Liebler.
3802 * Newly linked programs that define a variable called signgam will no longer
3803 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3804 require signgam to be set by those functions must ensure that they use the
3805 variable provided by the GNU C Library and declared in <math.h>, without
3806 defining their own copy.
3808 * The minimum GCC version that can be used to build this version of the GNU
3809 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3810 still be used to compile programs using the GNU C Library.
3812 Security related changes:
3814 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3815 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3817 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3818 the pointer guard feature. It is always enabled. Previously,
3819 LD_POINTER_GUARD could be used to disable security hardening in binaries
3820 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3823 * An integer overflow in hcreate and hcreate_r could lead to an
3824 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3826 * The catopen function no longer has unbounded stack usage. Reported by
3827 Max. (CVE-2015-8779)
3829 * The nan, nanf and nanl functions no longer have unbounded stack usage
3830 depending on the length of the string passed as an argument to the
3831 functions. Reported by Joseph Myers. (CVE-2014-9761)
3833 * A stack-based buffer overflow was found in libresolv when invoked from
3834 libnss_dns, allowing specially crafted DNS responses to seize control
3835 of execution flow in the DNS client. The buffer overflow occurs in
3836 the functions send_dg (send datagram) and send_vc (send TCP) for the
3837 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3838 family. The use of AF_UNSPEC triggers the low-level resolver code to
3839 send out two parallel queries for A and AAAA. A mismanagement of the
3840 buffers used for those queries could result in the response of a query
3841 writing beyond the alloca allocated buffer created by
3842 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3843 the overflow. Thanks to the Google Security Team and Red Hat for
3844 reporting the security impact of this issue, and Robert Holiday of
3845 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3847 The following bugs are resolved with this release:
3849 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3850 [887] math: Math library function "logb" and "nextafter" inconsistent
3851 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3852 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3853 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3854 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3856 [4404] localedata: German translation of "Alarm clock" is misleading
3857 [6799] math: nextafter() and nexttoward() doen't set errno on
3858 overflow/underflow errors
3859 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3861 [10432] nis: _nss_nis_setnetgrent assertion failure
3862 [11460] libc: fts has no LFS support
3863 [12926] network: getaddrinfo()/make_request() may spin forever
3864 [13065] nptl: Race condition in pthread barriers
3865 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3866 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3868 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3869 [14912] libc: Rename non-installed bits/*.h headers
3870 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3871 [15367] math: Let gcc use __builtin_isinf
3872 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3873 [15421] math: lgamma wrongly sets signgam for ISO C
3874 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3875 FE_INVALID with argument out of range
3876 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3878 [15786] dynamic-link: ifunc resolver functions can smash function
3880 [15918] math: Unnecessary check for equality in hypotf()
3881 [16061] localedata: Review / update transliteration data
3882 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3884 [16141] time: strptime %z offset restriction
3885 [16171] math: drem should be alias of remainder
3886 [16296] math: fegetround is pure?
3887 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3888 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3890 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3891 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3893 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3894 "Exception "Inexact" set" on ppc32
3895 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3896 [16517] math: Missing underflow exception from tanf/tan/tanl
3897 [16519] math: Missing underflow exception from sinhf
3898 [16520] math: Missing underflow exception from tanhf
3899 [16521] math: Missing underflow exception from exp2
3900 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3902 [16734] stdio: fopen calls mmap to allocate its buffer
3903 [16961] math: nan function incorrect handling of bad sequences
3904 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3905 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3906 [16985] locale: localedef: confusing error message when opening output
3908 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3909 [17197] locale: Redundant shift character in iconv conversion output at
3911 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3912 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3913 [17250] dynamic-link: static linking breaks nss loading
3914 (getaddrinfo/getpwnam/etc...)
3915 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3917 [17441] math: isnan() should use __builtin_isnan() in GCC
3918 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3919 (related to lock elision)
3920 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3921 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3922 [17887] time: strptime should be able to parse "+01:00" style timezones
3923 [17905] libc: catopen() Multiple unbounded stack allocations
3925 [18084] libc: backtrace (..., 0) dumps core on x86
3926 [18086] libc: nice() sets errno to 0 on success
3927 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3928 is too large (CVE-2015-8778)
3929 [18251] dynamic-link: SONAME missing when audit modules provides path
3930 [18265] libc: add attributes for wchar string and memory functions
3931 [18370] math: csqrt missing underflows
3932 [18421] libc: [hppa] read-only segment has dynamic relocations
3933 [18472] libc: Obsolete syscall wrappers should be compat symbols
3934 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3935 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3936 [18525] localedata: Remove locale timezone information
3937 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3938 [18568] localedata: Update locale data to Unicode 8.0
3939 [18589] locale: sort-test.sh fails at random
3940 [18595] math: ctan, ctanh missing underflows
3941 [18604] libc: assert macro-expands its argument
3942 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3943 contains a vector instruction exception.
3944 [18611] math: j1, jn missing errno setting on underflow
3945 [18618] localedata: sync Chechen locale definitions with other *_RU
3947 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3948 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3949 [18665] network: In send_dg, the recvfrom function is NOT always using the
3950 buffer size of a newly created buffer (CVE-2015-7547)
3951 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3953 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3955 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3956 [18699] math: tilegx cproj() for various complex infinities does not yield
3958 [18724] libc: Harden put*ent functions against data injection
3959 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3960 [18755] build: build errors with -DNDEBUG
3961 [18757] stdio: fmemopen fails to set errno on failure
3962 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3964 [18781] libc: openat64 lacks O_LARGEFILE
3965 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3966 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3967 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3968 [18790] math: [ldbl-128ibm] tanhl inaccurate
3969 [18795] libc: stpncpy fortification misses buffer lengths that are
3970 statically too large
3971 [18796] build: build fails for --disable-mathvec
3972 [18803] math: hypot missing underflows
3973 [18820] stdio: fmemopen may leak memory on failure
3974 [18823] math: csqrt spurious underflows
3975 [18824] math: fma spurious underflows
3976 [18825] math: pow missing underflows
3977 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3978 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3979 [18870] build: sem_open.c fails to compile with missing symbol
3981 [18872] stdio: Fix memory leak in printf_positional
3982 [18873] libc: posix_fallocate overflow check ineffective
3983 [18875] math: Excess precision leads incorrect libm
3984 [18877] libc: arm: mmap offset regression
3985 [18887] libc: memory corruption when using getmntent on blank lines
3986 [18918] localedata: hu_HU: change time to HH:MM:SS format
3987 [18921] libc: Regression: extraneous stat() and fstat() performed by
3989 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3990 binaries (CVE-2015-8777)
3991 [18951] math: tgamma missing underflows
3992 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3994 [18953] localedata: lt_LT: change currency symbol to the euro
3995 [18956] math: powf inaccuracy
3996 [18961] math: [i386] exp missing underflows
3997 [18966] math: [i386] exp10 missing underflows
3998 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3999 [18969] build: multiple string test failures due to missing locale
4001 [18970] libc: Reference of pthread_setcancelstate in libc.a
4002 [18977] math: float / long double Bessel functions not in XSI POSIX
4003 [18980] math: i386 libm functions return with excess range and precision
4004 [18981] math: i386 scalb*, ldexp return with excess range and precision
4005 [18982] stdio: va_list and vprintf
4006 [18985] time: Passing out of range data to strftime() causes a segfault
4008 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4009 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4010 [19012] locale: iconv_open leaks memory on error path
4011 [19016] math: clog, clog10 inaccuracy
4012 [19018] nptl: Mangle function pointers in tls_dtor_list
4013 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4014 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4015 [19048] malloc: malloc: arena free list can become cyclic, increasing
4017 [19049] math: [powerpc] erfc incorrect zero sign
4018 [19050] math: [powerpc] log* incorrect zero sign
4019 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4020 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4021 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4022 [19074] network: Data race in _res_hconf_reorder_addrs
4023 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4024 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4025 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4027 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4029 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4030 [19086] manual: posix_fallocate64 documented argument order is wrong.
4031 [19088] math: lround, llround missing exceptions close to overflow
4033 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4034 [19095] math: dbl-64 lrint incorrect for 64-bit long
4035 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4036 [19124] dynamic-link: ld.so failed to build with older assmebler
4037 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4038 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4039 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4040 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4041 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4042 pthread_setaffinity_np
4043 [19156] math: [ldbl-128] j0l spurious underflows
4044 [19164] nptl: tst-getcpu fails with many possible CPUs
4045 [19168] math: math/test-ildoubl and math/test-ldouble failure
4046 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4047 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4049 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4050 (FE_NOMASK_ENV) do not clear SSE exceptions
4051 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4052 _int_new_arena/reused_arena
4053 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4054 [19201] math: dbl-64 remainder incorrect sign of zero result
4055 [19205] math: bits/math-finite.h conditions do not match math.h and
4057 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4058 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4059 for C99-based standards
4060 [19212] libc: features.h not -Wundef clean
4061 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4063 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4064 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4065 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4067 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4068 "inexact" exceptions
4069 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4071 [19242] libc: strtol incorrect in Turkish locales
4072 [19243] malloc: reused_arena can pick an arena on the free list, leading
4073 to an assertion failure and reference count corruption
4074 [19253] time: tzset() ineffective when temporary TZ did not include DST
4076 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4077 [19270] math: [hppa] Shared libm missing __isnanl
4078 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4079 MAP_HUGETLB and MAP_STACK defines
4080 [19313] nptl: Wrong __cpu_mask for x32
4081 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4082 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4083 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4084 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4085 [19363] time: x32: times() return value wrongly truncates/sign extends
4087 [19367] dynamic-link: Improve branch prediction on Silvermont
4088 [19369] network: Default domain name not reset by res_ninit when "search"
4089 / "domain" entry is removed from resolv.conf
4090 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4092 [19385] localedata: bg_BG: time separator should be colon, not comma
4093 [19408] libc: linux personality syscall wrapper may erroneously return an
4094 error on 32-bit architectures
4095 [19415] libc: dladdr returns wrong names on hppa
4096 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4097 IBM905, IBM907, and IBM909
4098 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4099 [19443] build: build failures with -DDEBUG
4100 [19451] build: Make check fails on test-double-vlen2
4101 [19462] libc: Glibc failed to build with -Os
4102 [19465] math: Wrong code with -Os
4103 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4105 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4107 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4108 [19486] math: S390: Math tests fail with "Exception Inexact set".
4109 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4110 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4112 [19590] math: Fail to build shared objects that use libmvec.so functions.
4116 * The following bugs are resolved with this release:
4118 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4119 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4120 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4121 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4122 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4123 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4124 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4125 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4126 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4127 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4128 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4129 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4130 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4131 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4132 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4133 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4134 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4135 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4136 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4137 18657, 18676, 18694, 18696, 18887.
4139 * Cache information can be queried via sysconf() function on s390 e.g. with
4140 _SC_LEVEL1_ICACHE_SIZE as argument.
4142 * A buffer overflow in gethostbyname_r and related functions performing DNS
4143 requests has been fixed. If the NSS functions were called with a
4144 misaligned buffer, the buffer length change due to pointer alignment was
4145 not taken into account. This could result in application crashes or,
4146 potentially arbitrary code execution, using crafted, but syntactically
4147 valid DNS responses. (CVE-2015-1781)
4149 * The time zone file parser has been made more robust against crafted time
4150 zone files, avoiding heap buffer overflows related to the processing of
4151 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4152 large time zone data files. Overly long time zone specifiers in the TZ
4153 variable no longer result in stack overflows and crashes.
4155 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4156 for LD and GD on x86 and x86-64, has been implemented. You will need
4157 binutils-2.24 or later to enable this optimization.
4159 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4160 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4161 Hat). These updates cause user visible changes, such as the fix for bug
4164 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4165 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4166 condition in some applications.
4168 * Added vector math library named libmvec with the following vectorized x86_64
4169 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4171 The library can be disabled with --disable-mathvec. Use of the functions is
4172 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4173 Shared library libmvec.so is linked in as needed when using -lm (no need to
4174 specify -lmvec explicitly for not static builds).
4175 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4177 * A new fmemopen implementation has been added with the goal of POSIX
4178 compliance. The new implementation fixes the following long-standing
4179 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4180 old implementation is still present for use be by existing binaries.
4182 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4183 releases. It has been fixed to match 2.19 and older, but binaries built
4184 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4186 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4187 Contributed by Roland McGrath (Google).
4189 * The header <regexp.h> is deprecated, and will be removed in a future
4190 release. Use of this header will trigger a deprecation warning.
4191 Application developers should update their code to use <regex.h> instead.
4193 This header was formerly part of SUS, but was deprecated in 1994 and
4194 removed from the standard in 2001. Also, the glibc implementation
4195 leaks memory. See BZ#18681 for more details.
4199 * The following bugs are resolved with this release:
4201 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4202 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4203 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4204 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4205 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4206 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4207 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4208 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4209 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4210 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4213 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4214 too little memory for the to-be-scanned arguments and overflow the
4215 allocated buffer. The implementation now correctly computes the required
4216 buffer size when using malloc, and switches to malloc from alloca as
4219 * A new semaphore algorithm has been implemented in generic C code for all
4220 machines. Previous custom assembly implementations of semaphore were
4221 difficult to reason about or ensure that they were safe. The new version
4222 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4223 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4224 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4226 * Port to Altera Nios II has been contributed by Mentor Graphics.
4228 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4229 implementations for powerpc64/powerpc64le.
4230 Implemented by Adhemerval Zanella (IBM).
4232 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4233 and powerpc64le. This may improve lock scaling of existing programs on
4234 HTM capable systems. The lock elision code is only enabled with
4235 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4236 powerpc will issue a transaction abort on every syscall to avoid side
4237 effects being visible outside transactions.
4239 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4240 AArch64. Contributed by ARM Ltd.
4242 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4244 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4245 under certain input conditions resulting in the execution of a shell for
4246 command substitution when the application did not request it. The
4247 implementation now checks WRDE_NOCMD immediately before executing the
4248 shell and returns the error WRDE_CMDSUB as expected.
4250 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4251 processing format strings with a large number of format specifiers.
4253 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4254 infinite loop if the DNS response contained a PTR record of an unexpected
4257 * The minimum GCC version that can be used to build this version of the GNU
4258 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4259 still be used to compile programs using the GNU C Library.
4261 * The GNU C Library is now built with -Werror by default. This can be
4262 disabled by configuring with --disable-werror.
4264 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4266 * The obsolete sigvec function has been removed. This was the original
4267 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4268 programs have been using instead for about 25 years. Of course, ABI
4269 compatibility for old binaries using sigvec remains intact.
4271 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4272 with newer versions of bison.
4274 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4275 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4276 registers overlay two consecutive single-precision registers. MIPS32R2
4277 introduced a new FPU mode (FR=1) where double-precision registers extend the
4278 corresponding single-precision registers which is incompatible with the
4279 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4280 require the use of FR=1 making a transition necessary. New o32 ABI
4281 extensions enable users to migrate over time from the original o32 ABI
4282 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4283 tracks the ABI of any loaded object and verifies that new objects are
4284 compatible. Mode transitions will also be requested as required and
4285 unsupportable objects will be rejected. The ABI checks include both soft and
4286 hard float ABIs for o32, n32 and n64.
4288 GCC 5 with GNU binutils 2.25 onwards:
4289 It is strongly recommended that all o32 system libraries are built using the
4290 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4291 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4292 compiler using --with-fp-32=xx to set this by default.
4296 * The following bugs are resolved with this release:
4298 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4299 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4300 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4301 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4302 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4303 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4304 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4305 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4306 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4307 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4308 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4309 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4310 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4311 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4312 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4314 * Reverted change of ABI data structures for s390 and s390x:
4315 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4316 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4317 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4318 are preserved pointing straight to the same implementation as the old ones.
4319 Given that, new callers will simply provide a too-big buffer to these
4320 functions. Any applications/libraries out there that embed jmp_buf or
4321 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4322 against 2.19 headers will have to rebuilt again. This is necessary in any
4323 case to revert the breakage in their ABI caused by the glibc change.
4325 * Support for file description locks is added to systems running the
4326 Linux kernel. The standard file locking interfaces are extended to
4327 operate on file descriptions, not file descriptors, via the use of
4328 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4329 are associated with an open file instead of a process.
4331 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4333 * The minimum Linux kernel version that this version of the GNU C Library
4334 can be used with is 2.6.32.
4336 * Running the testsuite no longer terminates as soon as a test fails.
4337 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4338 with PASS or FAIL lines for individual tests. A summary of the results is
4339 printed, including a list of failing lists, and "make check" exits with
4340 error status if there were any unexpected failures. "make check
4341 stop-on-test-failure=y" may be used to keep the old behavior.
4343 * The am33 port, which had not worked for several years, has been removed
4346 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4347 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4348 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4349 conflicted with POSIX (support for which was removed in 2.19), the
4350 interfaces those macros enabled remain available when compiling with
4351 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4352 test macros defined.
4354 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4356 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4357 This may improve lock scaling of existing programs on TX capable systems.
4358 The lock elision code is only built with --enable-lock-elision=yes and
4359 then requires a GCC version supporting the TX builtins. With lock elision
4360 default mutexes are elided via __builtin_tbegin, if the cpu supports
4361 transactions. By default lock elision is not enabled and the elision code
4364 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4365 copy the path argument. This allowed programs to cause posix_spawn to
4366 deference a dangling pointer, or use an unexpected pathname argument if
4367 the string was modified after the posix_spawn_file_actions_addopen
4370 * All supported architectures now use the main glibc sysdeps directory
4371 instead of some being in a separate "ports" directory (which was
4372 distributed separately before glibc 2.17).
4374 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4375 On configurations that support it (all Linux configurations), it's now
4376 used regardless of the --enable-add-ons switch to configure. It is no
4377 longer possible to build such configurations without pthreads support.
4379 * Locale names, including those obtained from environment variables (LANG
4380 and the LC_* variables), are more tightly checked for proper syntax.
4381 setlocale will now fail (with EINVAL) for locale names that are overly
4382 long, contain slashes without starting with a slash, or contain ".." path
4383 components. (CVE-2014-0475) Previously, some valid locale names were
4384 silently replaced with the "C" locale when running in AT_SECURE mode
4385 (e.g., in a SUID program). This is no longer necessary because of the
4388 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4389 with application code using Intel MPX instructions. (With all previous
4390 versions, the MPX register state could be clobbered when making calls
4391 into or out of a shared library.) Note that while the new dynamic
4392 linker is compatible with all known x86 hardware whether or not it
4393 supports Intel MPX, some x86 instruction-set emulators might fail to
4394 handle the new instruction encodings. This is known to affect Valgrind
4395 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4396 release), and might affect other tools that do instruction emulation.
4398 * Support for loadable gconv transliteration modules has been removed.
4399 The support for transliteration modules has been non-functional for
4400 over a decade, and the removal is prompted by security defects. The
4401 normal gconv conversion modules are still supported. Transliteration
4402 with //TRANSLIT is still possible, and the //IGNORE specifier
4403 continues to be supported. (CVE-2014-5119)
4405 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4406 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4407 resulting a denial-of-service security vulnerability in applications which
4408 use functions related to iconv. (CVE-2014-6040)
4412 * The following bugs are resolved with this release:
4414 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4415 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4416 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4417 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4418 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4419 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4420 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4421 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4422 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4423 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4424 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4425 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4426 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4427 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4428 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4429 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4430 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4431 16431, 16453, 16474, 16506, 16510, 16529
4433 * Slovenian translations for glibc messages have been contributed by the
4434 Translation Project's Slovenian team of translators.
4436 * The public headers no longer use __unused nor __block. This change is to
4437 support compiling programs that are derived from BSD sources and use
4438 __unused internally, and to support compiling with Clang's -fblock
4439 extension which uses __block.
4441 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4442 large collation sequences to optimize multiple passes. This cache
4443 computation may overflow for large collation sequences and may cause a
4444 stack or buffer overflow. This is now fixed to use a slower algorithm
4445 which does not use a cache if there is an integer overflow.
4447 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4448 rules for large collation sequences to optimize multiple passes and falls
4449 back to alloca if malloc fails, resulting in a possible stack overflow.
4450 The implementation now falls back to an uncached collation sequence lookup
4453 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4454 initialized for static applications resulting in the security feature
4455 being disabled. The pointer guard is now correctly initialized to a
4456 random value for static applications. Existing static applications need
4457 to be recompiled to take advantage of the fix (bug 15754).
4459 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4460 to the d_name member of struct dirent, or omit the terminating NUL
4461 character. (Bugzilla #14699).
4463 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4464 aligned_alloc functions could allocate too few bytes or corrupt the
4465 heap when passed very large allocation size values (Bugzilla #15855,
4468 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4469 for AF_INET6 has been fixed (Bugzilla #16072).
4471 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4472 pap_CW, quz_PE, the_NP.
4474 * Substantially revised locales: gd_GB, ht_HT
4476 * The LC_ADDRESS field was updated to support country_car for almost all
4479 * ISO 1427 definitions were updated.
4481 * ISO 3166 definitions were updated.
4483 * The localedef utility now supports --big-endian and --little-endian
4484 command-line options to generate locales for a different system from that
4485 for which the C library was built.
4487 * Binary locale files now only depend on the endianness of the system for
4488 which they are generated and not on other properties of that system. As a
4489 consequence, binary files generated with new localedef may be incompatible
4490 with old versions of the GNU C Library, and binary files generated with
4491 old localedef may be incompatible with this version of the GNU C Library,
4492 in the following circumstances:
4494 + Locale files may be incompatible on m68k systems.
4496 + Locale archive files (but not separate files for individual locales) may
4497 be incompatible on systems where plain "char" is signed.
4499 * The configure option --disable-versioning has been removed. Builds with
4500 --disable-versioning had not worked for several years.
4502 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4503 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4505 * SystemTap probes for malloc have been introduced.
4507 * SystemTap probes for slow multiple precision fallback paths of
4508 transcendental functions have been introduced.
4510 * Support for powerpc64le has been added.
4512 * The soft-float powerpc port now supports e500 processors.
4514 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4516 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4517 set of header declarations that are enabled by default, even when other
4518 feature test macros or compiler options such as -std=c99 would otherwise
4519 disable some of those declarations.
4521 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4522 conflict with POSIX. The libbsd-compat library (which was a dummy library
4523 that did nothing) has also been removed.
4525 * Preliminary documentation about Multi-Thread, Async-Signal and
4526 Async-Cancel Safety has been added.
4528 * Change of ABI data structures for s390 and s390x:
4529 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4530 allow for future hardware extensions. All library functions that accept or
4531 return these structures were versioned in order to provide backwards
4532 compatibility with existing code. However, not all cases can be handled
4533 with interface versioning. If an application embeds either structure into
4534 another structure and that structure is passed to another compilation unit
4535 which expects the newer larger-sized object then any access to the new
4536 fields will result in undefined behaviour. Similarly any access to fields
4537 that were moved by the enlarging of the structures will cause undefined
4538 behaviour. To fix the undefined behaviour all objects that are part of the
4539 final in-memory image must agree on the size of structures, and this may
4540 require recompilation.
4544 * The following bugs are resolved with this release:
4546 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4547 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4548 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4549 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4550 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4551 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4552 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4553 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4554 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4555 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4556 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4557 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4558 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4561 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4562 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4563 Distributions can re-enable building and using pt_chown via the new configure
4564 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4565 considerable security risks and should only be used if the distribution
4566 understands and accepts the risks.
4568 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4571 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4572 fixed (Bugzilla #15330).
4574 * Add support for calling C++11 thread_local object destructors on thread
4575 and program exit. This needs compiler support for offloading C++11
4576 destructor calls to glibc.
4578 * Improved worst case performance of libm functions with double inputs and
4581 * Support for priority inherited mutexes in pthread condition variables on
4582 non-x86 architectures.
4584 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4586 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4588 * Optimized string functions for ARM. Implemented by Will Newton and
4591 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4593 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4596 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4597 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4599 * Added a benchmark framework to track performance of functions in glibc.
4601 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4602 It is based on draft TS 18661 and currently enabled as a GNU extension.
4604 * On Linux, the clock function now uses the clock_gettime system call
4605 for improved precision, rather than old times system call.
4607 * Added support for version-3 tz format files. This is needed when using
4608 the tz database release 2013e or later, and affects a few unusual cases --
4609 currently only TZ='America/Godthab' for time stamps after 2037.
4611 * Added new API functions pthread_getattr_default_np and
4612 pthread_setattr_default_np to get and set the default pthread
4613 attributes of a process.
4615 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4616 This may improve lock scaling of existing programs on TSX capable systems.
4617 When the --enable-lock-elision=yes parameter is specified at configure
4618 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4621 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4622 availability). Implemented by Ryan S. Arnold.
4624 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4628 * The following bugs are resolved with this release:
4630 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4631 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4632 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4633 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4634 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4635 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4636 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4637 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4638 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4639 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4640 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4641 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4642 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4643 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4644 14879, 14889, 14893, 14898, 14914.
4646 * Optimization of memcpy for MIPS.
4648 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4649 EMFILE has been fixed (Bugzilla #14889).
4651 * The add-on ports collection is now distributed in the "ports" subdirectory
4652 of the main GNU C Library distribution, rather than separately.
4654 * Port to ARM AArch64 contributed by Linaro.
4656 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4657 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4659 Implemented by Andreas Krebbel.
4661 * The new function secure_getenv allows secure access to the environment,
4662 returning NULL if running in a SUID/SGID process. This function replaces
4663 the internal function __secure_getenv.
4665 * SystemTap static probes have been added into the dynamic linker.
4666 Implemented by Gary Benson.
4668 * Optimizations of string functions strstr, strcasestr and memmem.
4669 Implemented by Maxim Kuvyrkov.
4671 * The minimum Linux kernel version that this version of the GNU C Library
4672 can be used with is 2.6.16.
4674 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4675 powerpc POWER7. Implemented by Will Schmidt.
4677 * New configure option --disable-nscd builds the C library such that it
4678 never attempts to contact the Name Service Caching Daemon (nscd).
4679 New configure option --disable-build-nscd avoids building nscd itself;
4680 this is the default if --disable-nscd is used.
4682 * Improved support for cross-compilation, including cross-testing and
4683 bootstrap builds without a previously built glibc.
4685 * Several testsuite tests are now able to test multiple IFUNC variants of an
4686 interface, rather than just testing the one that would be chooen by
4689 * New configure options --with-bugurl and --with-pkgversion, for
4690 distributors to use to embed their bug-reporting and package version
4691 information in --help and --version output.
4693 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4694 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4695 allows creation of chroots without the procfs mounted on /proc.
4697 * The `crypt' function now fails if passed salt bytes that violate the
4698 specification for those values. On Linux, the `crypt' function will
4699 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4700 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4701 when the mode is enabled.
4703 * The `clock_*' suite of functions (declared in <time.h>) is now available
4704 directly in the main C library. Previously it was necessary to link with
4705 -lrt to use these functions. This change has the effect that a
4706 single-threaded program that uses a function such as `clock_gettime' (and
4707 is not linked with -lrt) will no longer implicitly load the pthreads
4708 library at runtime and so will not suffer the overheads associated with
4709 multi-thread support in other code such as the C++ runtime library.
4711 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4716 * The following bugs are resolved with this release:
4718 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4719 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4720 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4721 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4722 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4723 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4724 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4725 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4726 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4727 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4728 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4729 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4730 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4731 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4732 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4733 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4734 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4735 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4736 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4737 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4738 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4739 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4742 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4743 configuring glibc with:
4744 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4745 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4746 Implemented by H.J. Lu.
4750 + define static_assert
4752 + do not declare gets
4754 + declare at_quick_exit and quick_exit also for ISO C11
4756 + aligned_alloc. NB: The code is deliberately allows the size parameter
4757 to not be a multiple of the alignment. This is a moronic requirement
4758 in the standard but it is only a requirement on the caller, not the
4761 + timespec_get added
4763 + uchar.h support added
4765 + CMPLX, CMPLXF, CMPLXL added
4767 Implemented by Ulrich Drepper.
4769 * Support for the IA-64 has been moved to ports.
4771 * Remove support for anything but ELF binary format
4773 * Checking versions of poll, ppoll added.
4774 Implemented by Ulrich Drepper.
4776 * More generic and 64-bit performance optimizations to math functions.
4777 Implemented by Ulrich Drepper.
4779 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4780 headers and functions available at compile time as they were before
4781 version 2.14. This option will be removed at some time in the future
4782 after the TI-RPC library becomes fully sufficient for the needs of
4783 existing applications.
4785 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4786 Note that glibc is not expected to work with any Linux kernel version
4789 * New header <sys/auxv.h> and function getauxval allowing easy access to
4790 the AT_* key-value pairs passed from the Linux kernel. The header also
4791 defines the HWCAP_* bits associated with the AT_HWCAP key.
4793 * New locales: mag_IN
4795 * New configure option --enable-systemtap builds SystemTap static probes
4796 into libc for setjmp and longjmp and into libpthread for various operations.
4797 So far the setjmp/longjmp probes and some of the libpthread probes are
4798 provided only for i*86 and x86_64.
4799 Implemented by Roland McGrath and Rayson Ho.
4801 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4803 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4806 * More optimized functions for SPARC. Implemented by David S. Miller.
4808 * Improved support for cross-compilation, especially bootstrap builds
4809 without a previously built glibc.
4811 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4812 Chris Metcalf from Tilera.
4814 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4815 now supported for ARM processors.
4817 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4818 as the name of the dynamic linker, to distinguish it from the
4819 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4821 * Support for CRIS has been removed from ports.
4823 * A new class of installed header has been documented for low-level
4824 platform-specific functionality. PowerPC added the first instance with a
4825 function to provide time base register access. Contributed by Tulio
4826 Magno Quites Machado Filho.
4828 * ix86 configurations now install header files that are consistent with
4829 what x86-64 configurations install. These same header files can be used
4830 for -m32, -m64, or -mx32 builds.
4831 Contributed by H.J. Lu.
4833 * Math library bug fixes. A thorough audit of all open math library bugs was
4834 conducted by Joseph Myers. Significant progress was made on many math
4835 library bugs resulting in more accurate exceptions and function results.
4836 Many thanks to all those that contributed including Andreas Jaeger for his
4837 patch review and work on the x87 trigonometric instruction issues.
4839 * Timezone data is no longer installed. Timezone-related binaries and scripts
4840 will continue to be installed. Users should obtain their timezone data from
4841 their distribution provider or from the tzdata package at
4842 <ftp://munnari.oz.au/pub/>.
4846 * The following bugs are resolved with this release:
4848 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4849 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4850 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4851 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4852 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4853 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4854 13484, 13506, 13515, 13523, 13524, 13538, 13540
4856 * New program pldd to list loaded object of a process
4857 Implemented by Ulrich Drepper.
4859 * Add nss_db support back to glibc. No more dependency on Berkeley db
4860 and support for initgroups lookups.
4861 Implemented by Ulrich Drepper.
4863 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4864 Contributed by HJ Lu.
4866 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4867 Contributed by HJ Lu.
4869 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4870 on x86-32 and x86-64.
4871 Contributed by Liubov Dmitrieva.
4873 * Optimized strchr and strrchr for SSE on x86-32.
4874 Contributed by Liubov Dmitrieva.
4876 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4877 for x86-64 and x86-32.
4878 Contributed by Liubov Dmitrieva.
4880 * New interfaces: scandirat, scandirat64
4881 Implemented by Ulrich Drepper.
4883 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4884 Implemented by Ulrich Drepper.
4886 * nscd now also caches the netgroup database.
4887 Implemented by Ulrich Drepper.
4889 * Integrate libm with gcc's -ffinite-math-only option.
4890 Implemented by Ulrich Drepper.
4892 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4893 to math functions. Implemented by Ulrich Drepper.
4895 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4896 Implemented by Ulrich Drepper.
4898 * New Linux interfaces: process_vm_readv, process_vm_writev
4900 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4901 Implemented by Ulrich Drepper.
4903 * Optimized nearbyint and strcasecmp for PPC.
4904 Implemented by Adhemerval Zanella.
4906 * New locales: bho_IN, unm_US, es_CU, ta_LK
4910 * The following bugs are resolved with this release:
4912 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4913 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4914 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4915 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4916 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4917 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4918 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4919 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4920 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4921 12795, 12811, 12813, 12814, 12841
4923 * The RPC implementation in libc is obsoleted. Old programs keep working
4924 but new programs cannot be linked with the routines in libc anymore.
4925 Programs in need of RPC functionality must be linked against TI-RPC.
4926 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4928 Visible changes of this change include (obviously) the inability to link
4929 programs using RPC functions without referencing the TI-RPC library and the
4930 removal of the RPC headers from the glibc headers.
4931 Implemented by Ulrich Drepper.
4933 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4934 syncfs, setns, sendmmsg
4936 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4937 yue_HK, lij_IT, mhr_RU
4939 * New encodings: CP770, CP771, CP772, CP773, CP774
4941 * New program sotruss to trace calls through PLTs
4942 Implemented by Ulrich Drepper.
4944 * The malloc hook implementation is marked deprecated and will be removed
4945 from the default implementation in the next version. The design never
4946 worked ever since the introduction of threads. Even programs which do
4947 not create threads themselves can use multiple threads created internally.
4951 * The following bugs are resolved with this release:
4953 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4954 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4955 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4956 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4959 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4961 * POWER7 optimizations: memset, memcmp, strncmp
4963 * New optimized string functions for x86-64: strnlen (SSE2),
4964 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4965 Implemented by Ulrich Drepper.
4969 * The following bugs are resolved with this release:
4971 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4972 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4973 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4974 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4975 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4976 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4977 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4978 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4980 * New interfaces: pthread_getname_np, pthread_setname_np
4982 * New Linux interface: recvmmsg
4984 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4986 * The dynamic linker now recognizes supported ABI versions from the
4987 EI_ABIVERSION field in the ELF header.
4988 Implemented by Ulrich Drepper.
4990 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4991 will not be used to fill in password fields in the passwd.byname replies.
4992 Instead it is used to synthesize the shadow.byname table, should it be
4993 missing. This is a useful mode in some installations involving Solaris.
4994 Implemented by Ulrich Drepper.
4996 * New locales: kok_IN, sq_MK, cv_RU
5000 * The following bugs are resolved with this release:
5002 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5003 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5004 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5005 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5006 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5007 10789, 10817, 10823, 10840, 10847
5009 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5011 Implemented by Ulrich Drepper.
5013 * Checking version of longjmp added that fails if an uninitialized stack
5014 frame would be created. Implemented by Ulrich Drepper.
5016 * STT_GNU_IFUNC is now supported in static executables.
5017 Implemented by H.J. Lu.
5019 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5021 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5022 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5023 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5024 Contributed by H.J. Lu.
5026 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5027 Implemented by Ulrich Drepper.
5029 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5031 Contributed by H.J. Lu.
5033 * Support for fma instruction in AVX on x86-64.
5034 Implemented by H.J. Lu and Ulrich Drepper.
5036 * AVX support in x86-64 auditing support in ld.so.
5037 Implemented by H.J. Lu.
5039 * STB_GNU_UNIQUE support added.
5040 Implemented by Ulrich Drepper.
5042 * Implement second fallback mode for optimized DNS lookup for even more
5043 broken environments. If two requests from the same port are not
5044 handled correctly close the socket and open a new one before sending
5045 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5046 can be used to select this mode right away, instead of rediscovering the
5047 necessity is every process again.
5048 Implemented by Ulrich Drepper.
5050 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5051 Implemented by Adam Tkac.
5053 * Optimized iconv conversions for S390x.
5054 Implemented by Andreas Krebbel.
5056 * Using condvars with PI mutexes is now more efficient due to kernel
5057 support for requeueing to PI futexes. NPTL support added for x86-64.
5058 Implemented by Ulrich Drepper.
5060 * New locales: ps_AF, my_MM
5064 * The following bugs are resolved with this release:
5066 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5067 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5068 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5069 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5070 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5072 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5073 Implemented by Ulrich Drepper.
5075 * New Linux interfaces: accept4, fallocate, fallocate64.
5076 Implemented by Ulrich Drepper.
5078 * Correct declarations of string function when used in C++ code. This
5079 could lead to compile errors for invalid C++ code.
5081 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5084 * New POSIX 2008 interface: psiginfo
5085 Implemented by Ulrich Drepper.
5087 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5088 Implemented by Ulrich Drepper.
5090 * Support for selecting between multiple function definitions at runtime
5091 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5093 * The libcrypt library can now use the hash function implementations in
5094 NSS. Implemented by Ulrich Drepper.
5096 * The malloc implementation can be compiled to be less memory efficient
5097 but higher performing in multi-threaded programs.
5098 Implemented by Ulrich Drepper.
5100 * New locales: nan_TW@latin, ks_IN
5102 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5103 Implemented by Ulrich Drepper.
5105 * Extended printf hook support. It is possible to use user-defined types
5106 and extend existing format specifiers.
5107 Implemented by Ulrich Drepper.
5109 * Handling for group shadow files has been added.
5110 Implemented by Ulrich Drepper.
5112 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5113 servers (the case, e.g., for some people using the built-in DNS
5114 server in ADSL modems/routers). There is a once-per-process timeout
5115 in case of a broken server. To avoid it, users can run nscd or put
5116 'options single-request' in /etc/resolv.conf.
5117 Implemented by Ulrich Drepper.
5121 * The following bugs are resolved with this release:
5123 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5124 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5125 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5126 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5127 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5129 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5130 up at the same time. Implemented by Ulrich Drepper.
5132 * TLS descriptors for LD and GD on x86 and x86-64.
5133 Implemented by Alexandre Oliva.
5135 * getaddrinfo now handles DCCP and UDPlite.
5136 Implemented by Ulrich Drepper.
5138 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5139 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5140 Implemented by Ulrich Drepper.
5142 * New implementation of memmem, strstr, and strcasestr which is O(n).
5143 Implemented by Eric Blake.
5145 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5147 * Implement "e" option for popen to open file descriptor with the
5148 close-on-exec flag set. Implemented by Ulrich Drepper.
5150 * Implement "b" mode for fmemopen. In this mode writes writes don't
5151 implicitly add a NUL byte and seeks from the end of the buffer really
5152 use the buffer end, not the string length as the basis.
5153 Implemented by Ulrich Drepper.
5155 * Many functions, exported and internal, now atomically set the close-on-exec
5156 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5158 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5160 Implemented by Pravin Satpute.
5162 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5166 * The following bugs are resolved with this release:
5168 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5169 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5170 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5171 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5172 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5173 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5174 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5176 * New locales: bo_CN, bo_IN, shs_CA.
5178 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5180 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5181 Implemented by Pravin Satpute.
5183 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5185 * nscd caches now all timeouts for DNS entries
5186 Implemented by Ulrich Drepper.
5188 * nscd is more efficient and wakes up less often.
5189 Implemented by Ulrich Drepper.
5191 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5192 vdprintf, and obstack_vprintf.
5193 Implemented by Jakub Jelinek.
5195 * Faster memset for x86-64.
5196 Implemented by Harsha Jagasia and H.J. Lu.
5198 * Faster memcpy on x86.
5199 Implemented by Ulrich Drepper.
5201 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5202 Implemented by Ulrich Drepper.
5204 * Faster sqrt and sqrtf implemention for some PPC variants.
5205 Implemented by Steven Munroe.
5209 * The following bugs are resolved with this release:
5211 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5212 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5213 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5214 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5215 5071, 5103, 5104, 5112, 5113, 5184, 5186
5217 * More checking functions: fread, fread_unlocked, open*, mq_open.
5218 Implemented by Jakub Jelinek and Ulrich Drepper.
5220 * Extend fortification to C++. Implemented by Jakub Jelinek.
5222 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5223 by not recognizing 'a' as a modifier when those specs are requested.
5224 Implemented by Jakub Jelinek.
5226 * PPC optimizations to math and string functions.
5227 Implemented by Steven Munroe.
5229 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5230 options to be passed. Implemented by Ulrich Drepper.
5232 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5234 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5235 Implemented by Ulrich Drepper.
5237 * Handle private futexes in the NPTL implementation.
5238 Implemented by Jakub Jelinek and Ulrich Drepper.
5240 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5241 Implemented by Roland McGrath and Ulrich Drepper.
5243 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5245 * SHA-256 and SHA-512 based password encryption.
5246 Implemented by Ulrich Drepper.
5248 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5249 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5252 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5253 Implemented by Ulrich Drepper.
5257 * The following bugs are resolved with this release:
5259 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5260 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5261 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5262 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5263 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5264 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5265 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5268 * New Linux interfaces: epoll_pwait, sched_getcpu.
5270 * New generic interfaces: strerror_l.
5272 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5276 * The following bugs are resolved with this release:
5278 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5279 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5280 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5281 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5282 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5283 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5284 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5285 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5286 3225, 3251, 3252, 3253, 3273
5288 * For Linux, the sorting of addresses returned by getaddrinfo now also
5289 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5290 Implemented by Ulrich Drepper.
5292 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5293 Implemented by Ulrich Drepper.
5295 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5297 * New iconv module for MIK. Contributed by Alexander Shopov.
5299 * For sites with broken group and/or passwd database, the auto-propagate
5300 option of nscd can prevent creating ID lookup entries from the results
5301 of a name lookup and vice versa. This usually is no problem but some
5302 site might have problems with the default behavior.
5303 Implemented by Ulrich Drepper.
5305 * Iterating over entire database in NIS can be slow. With the
5306 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5307 to trade time for memory. The entire database will be read at once.
5308 Implemented by Ulrich Drepper.
5310 * The interfaces introduced in RFC 3542 have been implemented by
5313 * Support for the new ELF hash table format was added by Ulrich Drepper.
5315 * Support for priority inheritance mutexes added by Jakub Jelinek and
5318 * Support for priority protected mutexes added by Jakub Jelinek.
5320 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5321 or_IN, csb_PL, fy_NL, sr_ME.
5325 * More overflow detection functions.
5327 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5328 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5330 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5331 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5332 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5333 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5334 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5335 by Masahide Washizawa.
5337 * It is now possible to install audit libraries for the dynamic linker using
5338 LD_AUDIT. Implemented by Ulrich Drepper.
5340 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5341 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5342 For a libc and libpthread that works well on Linux 2.4 kernels, we
5343 recommend using the stable 2.3 branch.
5345 * The new function open_wmemstream acts like open_memstream,
5346 but uses a wchar_t wide character buffer.
5348 * The new function ppoll is an improved version of poll, similar to pselect.
5350 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5351 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5352 renameat, unlinkat, linkat, symlinkat, readlinkat.
5354 * New Linux kernel system calls: unshare,
5355 inotify_init, inotify_add_watch, inotify_rm_watch.
5357 * The euidaccess function is now also known by the alias eaccess,
5358 for compatibility with some other systems.
5360 * Timezone data updated to 2006b version.
5364 * The following bugs are resolved with this release:
5366 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5367 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5368 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5369 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5370 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5371 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5373 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5375 * As of this release, GCC 4 can be used to compile the C Library.
5377 * Timezone data updated to 2005m version.
5381 * The following bugs are resolved with this release:
5383 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5384 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5385 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5386 777, 787, 821, 822, 823, 825
5388 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5392 * Support for RFC 3678. Real implementations exist only for Linux so far.
5393 Implemented by Ulrich Drepper.
5395 * nscd can now cache entries persistently. Expiring entries are reloaded.
5396 For speedups the cache can be shared in memory with client processes.
5397 Implemented by Ulrich Drepper.
5399 * nscd can now perform SELinux checks.
5400 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5402 * getaddrinfo queries are now cached. Canonical name lookup is performed
5404 Implemented by Ulrich Drepper.
5406 * The nothrow function attribute is used when headers are used by gcc when
5407 compiling C code. This can avoid significant amounts of exception
5410 * The malloc functions perform more error checking and are stricter when
5411 it comes to reacting on errors. The default action is to terminate
5412 the process after showing an error message. Implemented by Ulrich Drepper.
5414 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5415 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5417 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5418 namespaces using the new function dlmopen(). This feature is of course,
5419 like most other dynamic loading functionality, not available in statically
5420 linked applications. Implemented by Ulrich Drepper.
5422 * Low-overhead boundary checking variants of string and some stdio functions
5423 were added. These are to be used in conjunction with a gcc patch by
5424 Jakub Jelinek which adds calls to these functions if possible.
5425 Implemented by Jakub Jelinek and Ulrich Drepper.
5427 * Old code for several operating systems and machine architectures that
5428 have not been in working condition in a long time have been removed from
5429 the main source tree maintained by the GNU C Library's maintainers.
5430 These files are now reside in the separate `ports' source module
5431 that is usable as an add-on when building the library.
5435 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5436 interrogate the dynamic linker, compatible with the Solaris interface.
5438 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5439 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5441 * getifaddrs now uses the netlink interface on Linux to get its information.
5442 Implemented by Thorsten Kukuk.
5444 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5445 Implemented by Ulrich Drepper.
5447 * support for non-executable stacks on x86 has been added. Changes mostly
5450 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5453 * getaddrinfo now performs destination address selection according to
5458 * Thread-safe interfaces for many functions that access locale data
5459 were added in version 2.3, but these features were omitted from NEWS.
5460 Many functions have variants with an `_l' suffix that take a `locale_t'
5461 object as a parameter rather than consulting the current locale.
5462 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5463 create and maintain `locale_t' objects. Additionally, the new function
5464 `uselocale' sets "the current locale" (as used by functions not so
5465 parameterized) set for an individual thread. These features were added
5466 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5468 * The functions getresuid, getresgid, setresuid, and setresgid, which
5469 have long been available on Linux, are now declared in <unistd.h>
5470 and are now also available on the Hurd.
5472 * ELF thread-local storage support (TLS) now works on x86-64.
5474 * The new dynamic string token $LIB is expanded in shared library names.
5475 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5477 * Aldy Hernandez contributed complete software floating point support for
5478 PowerPC machines with no FPU.
5480 * fexecve is implemented on Linux.
5482 * The `btowc' function should work at least twice as fast due to
5483 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5485 * With approriate thread add-ons cancelable functions are now implemented
5486 in libc.so as well. No need to call the function in libpthread. This
5487 change allowed to finally disable the incorrect and expensive handling
5488 of weak definition in ld.so.
5490 * Yet more PLT entries in libc.so have been removed. We finally arrived
5491 at the bare minimum. Startup times improved appropriately.
5493 * Support for the new Linux/x86 system call interface was added. The
5494 AT_SYSINFO auxiliary vector entry is recognized and handled.
5498 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5501 * iconv (the program and the interface) now accepts empty names (excluding
5502 options like //TRANSLIT) to mean "use charset of current locale".
5504 * localedef can now transliterate characters in strings which are not in
5505 the provided charmap. The information from the input locale is used.
5507 * Prelinking support was added for ELF targets. This requires additional
5508 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5510 * Read-only stdio streams now use mmap to speed up operation by eliminating
5511 copying and buffer underflows. To use add 'm' to the mode string of
5512 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5514 * The malloc functions were completely rewritten by Wolfram Gloger based
5515 on Doug Lea's malloc-2.7.0.c.
5517 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5518 implementation of regex.
5520 * Bruno Haible upgraded the iconv and locale implementation to support
5523 * Contents of the LC_* and LANG environment variables in the CEN style are
5524 not recognized anymore. It never was used. Change by Ulrich Drepper.
5526 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5527 thread-local storage (TLS) ABI on some platforms.
5528 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5530 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5531 EUC-JISX0213, and TSCII.
5533 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5534 BSD-compatible interface for getting all network interface addresses.
5535 Implementation for IPv4 by Roland McGrath.
5537 * Loading of locale data is faster due to the introduction of a locale
5538 archive. Implemented by Roland McGrath and Ulrich Drepper.
5540 * Startup times are significantly reduced by not using exported functions
5541 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5544 * Steven Munroe contributed a port to PowerPC64/Linux.
5548 * The Hurd now uses the GNU libio implementation of stdio rather than the
5549 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5551 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5552 with the same behavior as the Linux system call of the same name.
5556 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5557 128-bit long double format.
5559 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5560 IBM1161, and IBM1162 charsets.
5562 * Andreas Jaeger contributed a port to x86-64/Linux.
5564 * Peter Bruin contributed a port to PowerPC/Hurd.
5566 * libc functions using I/O streams now can handle wide-oriented streams
5569 * optimizations in the dynamic linker. Binaries created by recent binutils
5570 versions start up quicker due to reduced time spent on relocations.
5572 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5576 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5577 asinh, atanh, j0 for the 128-bit long double format.
5579 * Bruno Haible updated all the code handling Unicode in some form to
5580 support Unicode 3.1.
5582 * Speed of regex for single-byte locales is back to previous levels.
5583 Patch by Isamu Hasegawa.
5585 * Alpha, SPARC, and IA-64 now also using floating stacks.
5587 * Startup time of internationalized applications greatly improved through
5588 iconv cache. Use iconvconfig to generate the cache file.
5589 Contributed by Ulrich Drepper.
5591 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5592 severe performance problems. Patch by David Mosberger.
5594 * The Hurd port got a lot more functionality like AIO, various stdio
5595 extensions, etc. Mainly done by Roland McGrath.
5597 * mtrace can now lookup symbols in shared libraries.
5601 * Intel's IA-64 math library is largely integrated. It provides fast and
5602 accurate implementatations for most basic and standard math functions
5603 in float, double, and long double format.
5605 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5606 and asin for the 96-bit long double format and asin, log, tan for the
5607 128-bit long double format.
5609 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5610 The basic double functions exist today. Contributed by Abraham Ziv
5611 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5612 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5614 * An asynchronous name lookup library was added. The interface is designed
5615 after POSIX AIO. The proposal was circulated beforehand to get comments.
5616 No negative ones came in. Implemented by Ulrich Drepper.
5618 * Port to S390/64bit contributed by Martin Schwidefsky
5619 <schwidefsky@de.ibm.com>.
5621 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5622 of functions for Linux/IA-64.
5624 * The RPC code is now thread safe. Threads can now use the same service
5625 of different services at the same time. Patch by Eric Norum
5626 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5628 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5629 family of functions for Linux/S390.
5631 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5632 of functions for Linux/x86.
5634 * Port to Linux/CRIS contributed by Axis Communications.
5638 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5639 we can now check for namespace violations and missing declarations. The
5640 result is that almost all headers are now Unix-compliant (as defined in
5641 the upcoming XPG6). The negative side is that some programs might need
5642 corrections, too, if they depend on the incorrect form of the headers in
5643 previous versions which defined too many symbols and included too many
5646 * regex now handles multibyte character sets correctly.
5647 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5649 * iconv (the program) does now conform to the upcoming XPG6 and handles
5650 charmaps. Instead of the charset names the path of charmaps can be
5651 provided and the conversion happens based on this data.
5652 Contributed by Ulrich Drepper.
5654 * The locale program now provides detailed information about the installed
5659 only lists the names of the supported locales
5663 provides details such as country, language, and codeset name.
5664 Contributed by Ulrich Drepper.
5668 * The gencat program now parses the input file according to the charset
5669 selected by the LC_CTYPE category. This is important for stateful
5670 character sets. To make generating catalogs easier there is a way
5671 to overwrite the charset selected by the locale: before the first
5672 message or $ quote line the catalog can contain a line like
5674 $ codeset=ISO-8859-2
5676 to select the charset (ISO-8859-2 in this case).
5678 Implemented by Shinya Hanataka and Ulrich Drepper.
5680 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5681 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5682 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5684 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5685 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5687 * The LANGUAGE environment variable is now ignored unless the locale is
5688 changed from the default "C" locale.
5690 * The usual bug fixes.
5694 * Greg McGary added runtime support for bounds checking using gcc's
5695 new -fbounded-pointers option. ix86 target is complete. PowerPC
5698 * Thorsten Kukuk added secure mode support to nscd.
5700 * The Berkeley db libraries have been removed.
5702 Related, the nss_db module is now in a separate package since it
5703 obviously requires a database library being available.
5705 * Wide character I/O streams implemented by Ulrich Drepper.
5707 * Functions from the extended socket API added by Ulrich Drepper.
5709 * Functions feenableexcept and fedisableexcept to control the
5710 behaviour of individual exceptions have been added by Andreas Jaeger.
5712 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5714 * The resolver code has been updated from bind 8.2.3-T5B which supports
5715 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5718 This change could in some situations effect backward compatibility. Since
5719 now `_res' is a thread-local instead of a global variable, modifying it
5720 in one thread does not have any effect in other threads.
5722 The resolver library was also extended to allow IPv6 as the transport
5723 protocol for the requests. This work was done by Stig Venaas.
5725 * Compatibility code for K&R C compilers has been removed from the
5726 header files. A ISO C compiler is needed to use the library
5727 (conforming to either C89 or C99 standard).
5729 * Complete rewrite of the localedef program to support multibyte character
5730 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5731 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5732 Implemented by Ulrich Drepper.
5734 Bruno Haible significantly improved the generation and use of the data
5735 structures for the wide character tables.
5737 * Plural handling in gettext implemented by Ulrich Drepper.
5739 * The utmp daemon has been removed.
5741 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5743 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5746 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5748 * POSIX barriers implemented by Kaz Kylheku.
5750 * POSIX spawn function family implemented by Ulrich Drepper.
5752 * POSIX spinlocks are now available.
5754 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5756 * the configure option --enable-kernel=X.Y.Z allows to strip out
5757 compatibility for kernel versions before X.Y.Z. This is currently only
5758 implemented for Linux.
5760 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5761 field sin6_scope_id. This means that all programs using IPv6 should be
5762 recompiled. Don't expect binary compatibility with previous glibc
5765 * various conversion modules for IBM character sets contributed by
5768 * IA-64 port by Jes Sorensen and HJ Lu.
5782 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5784 * New xdr functions are added; some rpc functions are now 64bit clean.
5786 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5788 * Fixed known incompatibilities with glibc 2.0.
5790 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5792 * Optimized a number of functions (especially the ELF dynamic loader).
5794 * Update timezone data files.
5796 * lots of charmaps corrections
5798 * some new locale definitions and charmaps
5803 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5804 conform to POSIX member type requirements. Symbol versions have been
5805 adjusted as needed within the library, and for direct use by applications,
5806 but there is potential for problems if third-party libraries use
5807 struct timeval as part of their interface. This does not present
5808 a problem for X and other "essential" system libraries.
5810 * An additional locale model to support C++ Standard Library locale
5811 model and probably more was implemented by Ulrich Drepper.
5813 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5816 * Miles Bader provided the `argp' function family to support hierachical
5817 command line argument parsing, layered on top of getopt.
5819 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5821 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5824 * scanf recognizes the %a and %A format for scanning floating point numbers.
5826 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5827 information and interfaces for the available integer types.
5829 * about 130 new math functions were added to implement the ISO C9x math
5832 * the new header <complex.h> contains definitions of the complex math
5833 functions from ISO C 9X.
5835 * the new header <tgmath.h> defines generic macros to use complex or
5836 real valued functions.
5838 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5840 * Andreas Jaeger provided a test suite for the math library.
5842 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5844 * Ulrich Drepper added character set conversion functions (iconv).
5846 * Optimized string functions have been added.
5848 * The localedata addon is now part of glibc.
5850 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5852 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5853 daemon for NSS (nscd).
5855 Missing a better place here are some numbers on improvements. Under
5856 Linux 2.1.125 un-tar-ing the kernel sources takes
5860 using local files 12.19s 6.88s 22.91s
5862 using NIS 13.92s 8.91s 26.34s
5864 using NIS & nscd 10.37s 7.34s 25.30s
5866 using NIS+ 27.57s 30.37s 640.46s
5868 using NIS+ & nscd 10.25s 7.83s 26.51s
5870 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5872 Keep in mind that non-namelookup related operations dominate above times.
5873 It was just a common complain that using NIS+ unpacking the kernel is
5876 [1] The old nscd implementation is not available anymore since it was
5877 distributed with glibc up to version 2.0.98 and thus is now replaced.
5879 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5881 * Mark Kettenis provided a Hesiod NSS module.
5883 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5884 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5886 * rcmd can now handle netgroups (Dick Streefland).
5888 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5891 * Support for the IPv6 protocol has been added to the socket API, as per the
5892 latest draft standards.
5894 * Support for Linux 2.2 has been added.
5896 * Interface changes relative to the latest 2.0.x release:
5897 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5898 addseverity NEW: Unix98
5899 alphasort64 NEW: LFS
5900 argp_err_exit_status NEW: argp, GNU ext
5901 argp_error NEW: argp, GNU ext
5902 argp_failure NEW: argp, GNU ext
5903 argp_help NEW: argp, GNU ext
5904 argp_parse NEW: argp, GNU ext
5905 argp_program_bug_address NEW: argp, GNU ext
5906 argp_program_version NEW: argp, GNU ext
5907 argp_program_version_hook NEW: argp, GNU ext
5908 argp_state_help NEW: argp, GNU ext
5909 argp_usage NEW: argp, GNU ext
5910 authdes_create NEW: Secure RPC
5911 authdes_getucred NEW: Secure RPC
5912 authdes_pk_create NEW: Secure RPC
5913 backtrace NEW: GNU ext.
5914 backtrace_symbols NEW: GNU ext.
5915 backtrace_symbols_fd NEW: GNU ext.
5917 cacosf NEW: ISO C 9x
5918 cacosh NEW: ISO C 9x
5919 cacoshf NEW: ISO C 9x
5920 cacoshl NEW: ISO C 9x
5921 cacosl NEW: ISO C 9x
5928 casinf NEW: ISO C 9x
5929 casinh NEW: ISO C 9x
5930 casinhf NEW: ISO C 9x
5931 casinhl NEW: ISO C 9x
5932 casinl NEW: ISO C 9x
5934 catanf NEW: ISO C 9x
5935 catanh NEW: ISO C 9x
5936 catanhf NEW: ISO C 9x
5937 catanhl NEW: ISO C 9x
5938 catanl NEW: ISO C 9x
5939 cbc_crypt NEW: Secure RPC
5943 ccoshf NEW: ISO C 9x
5944 ccoshl NEW: ISO C 9x
5950 cimagf NEW: ISO C 9x
5951 cimagl NEW: ISO C 9x
5952 clearerr_locked REMOVED
5953 clntunix_create NEW: sunrpc ext
5955 clog10 NEW: ISO C 9x
5956 clog10f NEW: ISO C 9x
5957 clog10l NEW: ISO C 9x
5967 cprojf NEW: ISO C 9x
5968 cprojl NEW: ISO C 9x
5970 crealf NEW: ISO C 9x
5971 creall NEW: ISO C 9x
5976 csinhf NEW: ISO C 9x
5977 csinhl NEW: ISO C 9x
5980 csqrtf NEW: ISO C 9x
5981 csqrtl NEW: ISO C 9x
5985 ctanhf NEW: ISO C 9x
5986 ctanhl NEW: ISO C 9x
5988 des_setparity NEW: Secure RPC
5989 ecb_crypt NEW: Secure RPC
5990 endutxent NEW: Unix98
5992 exp10f NEW: ISO C 9x
5993 exp10l NEW: ISO C 9x
5997 fattach NEW: STREAMS
5998 fdetach NEW: STREAMS
6002 feclearexcept NEW: ISO C 9x
6003 fegetenv NEW: ISO C 9x
6004 fegetexceptflag NEW: ISO C 9x
6005 fegetround NEW: ISO C 9x
6006 feholdexcept NEW: ISO C 9x
6008 feraiseexcept NEW: ISO C 9x
6009 ferror_locked REMOVED
6010 fesetenv NEW: ISO C 9x
6011 fesetexceptflag NEW: ISO C 9x
6012 fesetround NEW: ISO C 9x
6013 fetestexcept NEW: ISO C 9x
6014 feupdateenv NEW: ISO C 9x
6015 fflush_locked REMOVED
6019 fgets_unlocked NEW: GNU ext.
6020 fileno_locked REMOVED
6032 fputc_locked REMOVED
6033 fputs_unlocked NEW: GNU ext.
6034 fread_unlocked NEW: GNU ext.
6039 fstatvfs NEW: Unix98
6043 ftruncate64 NEW: LFS
6045 fwrite_unlocked NEW: GNU ext.
6046 gai_strerror NEW: IPv6
6050 getchar_locked REMOVED
6052 getdate_err NEW: Unix98
6053 getdate_r NEW: GNU ext.
6055 getnameinfo NEW: IPv6
6056 getnetname NEW: Secure RPC
6057 getpmsg NEW: STREAMS
6058 getpt NEW: Unix98 PTY
6059 getrlimit64 NEW: LFS
6060 getutxent NEW: Unix98
6061 getutxid NEW: Unix98
6062 getutxline NEW: Unix98
6063 glob64 NEW: GNU ext.
6064 globfree64 NEW: GNU ext.
6065 gnu_get_libc_release NEW: GNU ext.
6066 gnu_get_libc_version NEW: GNU ext.
6067 grantpt NEW: Unix98 PTY
6068 host2netname NEW: Secure RPC
6070 iconv_close NEW: iconv
6071 iconv_open NEW: iconv
6072 if_freenameindex NEW: IPv6
6073 if_indextoname NEW: IPv6
6074 if_nameindex NEW: IPv6
6075 if_nametoindex NEW: IPv6
6076 in6addr_any NEW: IPv6
6077 in6addr_loopback NEW: IPv6
6078 inet6_isipv4mapped NEW: IPv6
6079 isastream NEW: STREAMS
6080 iswblank NEW: GNU ext.
6081 key_decryptsession NEW: Secure RPC
6082 key_decryptsession_pk NEW: Secure RPC
6083 key_encryptsession NEW: Secure RPC
6084 key_encryptsession_pk NEW: Secure RPC
6085 key_gendes NEW: Secure RPC
6086 key_get_conv NEW: Secure RPC
6087 key_secretkey_is_set NEW: Secure RPC
6088 key_setnet NEW: Secure RPC
6089 key_setsecret NEW: Secure RPC
6090 llrint NEW: ISO C 9x
6091 llrintf NEW: ISO C 9x
6092 llrintl NEW: ISO C 9x
6093 llround NEW: ISO C 9x
6094 llroundf NEW: ISO C 9x
6095 llroundl NEW: ISO C 9x
6100 lrintf NEW: ISO C 9x
6101 lrintl NEW: ISO C 9x
6102 lround NEW: ISO C 9x
6103 lroundf NEW: ISO C 9x
6104 lroundl NEW: ISO C 9x
6106 makecontext NEW: Unix98
6107 mempcpy NEW: GNU ext.
6110 modify_ldt NEW: kernel
6114 nearbyint NEW: ISO C 9x
6115 nearbyintf NEW: ISO C 9x
6116 nearbyintl NEW: ISO C 9x
6117 netname2host NEW: Secure RPC
6118 netname2user NEW: Secure RPC
6119 nexttoward NEW: ISO C 9x
6120 nexttowardf NEW: ISO C 9x
6121 nexttowardl NEW: ISO C 9x
6125 passwd2des NEW: Secure RPC
6127 pow10f NEW: GNU ext.
6128 pow10l NEW: GNU ext.
6131 printf_size NEW: GNU ext.
6132 printf_size_info NEW: GNU ext.
6133 profil_counter REMOVED
6134 pthread_mutexattr_getkind_np REPLACED
6135 pthread_mutexattr_setkind_np REPLACED
6136 ptsname NEW: Unix98 PTY
6137 ptsname_r NEW: Unix98 PTY
6139 putchar_locked REMOVED
6140 putgrent NEW: GNU ext.
6142 putpmsg NEW: STREAMS
6143 pututxline NEW: Unix98
6147 readdir64_r NEW: LFS
6148 remquo NEW: ISO C 9x
6149 remquof NEW: ISO C 9x
6150 remquol NEW: ISO C 9x
6152 roundf NEW: ISO C 9x
6153 roundl NEW: ISO C 9x
6155 scalbln NEW: ISO C 9x
6156 scalblnf NEW: ISO C 9x
6157 scalblnl NEW: ISO C 9x
6159 sendfile NEW: kernel
6160 setcontext NEW: Unix98
6161 setrlimit64 NEW: LFS
6162 setutxent NEW: Unix98
6164 sigignore NEW: Unix98
6165 sigqueue NEW: POSIX.1b
6166 sigrelse NEW: Unix98
6167 sigset NEW: POSIX.1b
6168 sigtimedwait NEW: POSIX.1b
6169 sigwaitinfo NEW: POSIX.1b
6170 sincos NEW: GNU ext.
6171 sincosf NEW: GNU ext.
6172 sincosl NEW: GNU ext.
6176 strcasestr NEW: GNU ext.
6177 strtoimax NEW: ISO C 9x
6178 strtoumax NEW: ISO C 9x
6179 strverscmp NEW: GNU ext.
6180 svcauthdes_stats NEW: Secure RPC
6181 svcunix_create NEW: sunrpc etx
6182 svcunixfd_create NEW: sunrpc ext
6183 swapcontext NEW: Unix98
6184 tcgetsid NEW: Unix98 PTY
6185 tdestroy NEW: GNU ext.
6186 tgamma NEW: ISO C 9x
6187 tgammaf NEW: ISO C 9x
6188 tgammal NEW: ISO C 9x
6192 truncf NEW: ISO C 9x
6193 truncl NEW: ISO C 9x
6195 unlockpt NEW: Unix98 PTY
6196 updwtmpx NEW: Unix98
6197 user2netname NEW: Secure RPC
6198 utmpxname NEW: Unix98
6199 versionsort NEW: GNU ext.
6200 versionsort64 NEW: GNU ext.
6202 wcscasecmp NEW: GNU ext.
6203 wcsncasecmp NEW: GNU ext.
6204 wcsnlen NEW: GNU ext.
6205 wcstoimax NEW: ISO C 9x
6206 wcstoll NEW: ISO C 9x
6207 wcstoull NEW: ISO C 9x
6208 wcstoumax NEW: ISO C 9x
6210 wordexp NEW: POSIX.2
6211 wordfree NEW: POSIX.2
6212 write_profiling REMOVED
6213 xdecrypt NEW: Secure RPC
6214 xdr_authdes_cred NEW: Secure RPC
6215 xdr_authdes_verf NEW: Secure RPC
6216 xdr_cryptkeyarg NEW: Secure RPC
6217 xdr_cryptkeyarg2 NEW: Secure RPC
6218 xdr_cryptkeyres NEW: Secure RPC
6219 xdr_getcredres NEW: Secure RPC
6220 xdr_key_netstarg NEW: Secure RPC
6221 xdr_key_netstres NEW: Secure RPC
6222 xdr_keybuf NEW: Secure RPC
6223 xdr_keystatus NEW: Secure RPC
6224 xdr_netnamestr NEW: Secure RPC
6225 xdr_sizeof NEW: Secure RPC
6226 xdr_unixcred NEW: sunrpc ext
6227 xencrypt NEW: Secure RPC
6228 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6239 * inet_ntoa is thread-safe
6241 * updwtmp is moved from libutil to libc
6243 * rewrite of cbrt function
6245 * update of timezone data
6259 * add atoll function
6261 * fix complex problems in Berkeley DB code
6263 * fix math functions
6267 * fixed lots of header problems (especially Linux/GNU specific)
6269 * dynamic loader preserves all registers
6271 * Roland McGrath provided support for handling of auxiliary objects in
6272 the ELF dynamic loader.
6274 * support for parallel builds is improved
6278 * GNU extensions are no longer declared by default. To enable them you
6279 must define the macro `_GNU_SOURCE' in your program or compile with
6282 * The library has changed from using GNU ld symbol aliases to using weak
6283 symbols where available. The ELF object file format supports weak
6284 symbols; GNU ld also supports weak symbols in the a.out format. (There
6285 is also now support for other GNU ld extensions in ELF. Use the
6286 `--with-elf' option to configure to indicate you have ELF, and
6287 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6288 of many files which contained only symbol aliases, reducing the size of
6289 the source and the compiled library; many other files were renamed to
6290 less cryptic names previously occupied by the symbol alias files.
6291 There is a new header file <elf.h> for programs which operate on
6292 files in the ELF format.
6294 * Converted to Autoconf version 2, so `configure' has more options.
6295 Run `configure --help' to see the details.
6297 * The library can now be configured to build profiling, highly-optimized
6298 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6299 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6300 `configure' enable building these extra libraries. The shared library is
6301 built by default when using both ELF and GNU ld. When shared libraries
6302 are enabled, the new library `-ldl' is available for arbitrary run-time
6303 loading of shared objects; its interface is defined in <dlfcn.h>. The
6304 new header file <link.h> gives access to the internals of the run-time
6305 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6306 application of same name on other systems and it provides information
6307 about dynamically linked binaries.
6309 * The C library now provides the run-time support code for profiling
6310 executables compiled with `-pg'. Programs can control the profiling code
6311 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6312 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6313 the support for this file format was contributed by David Mosberger-Tang.
6315 * The math code has been replaced with a math library based on fdlibm from
6316 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6317 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6318 functions. The math functions now reside in a separate library, so
6319 programs using them will need to use `-lm' their linking commands.
6321 * John C. Bowman contributed optimized ix87 assembler inline functions.
6323 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6324 mechanism similar to that found in Solaris 2. This is now used for the
6325 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6326 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6327 file controls what services are used for each individual database. This
6328 works by loading shared libraries with names specified in `nsswitch.conf',
6329 so service modules can be changed or added at any time without even
6330 relinking any program. Currently there are the file, db, and NIS based
6331 NSS services available.
6333 * The new functions `strtoq' and `strtouq' parse integer values from
6334 strings, like `strtol' and `strtoul', but they return `long long int' and
6335 `unsigned long long int' values, respectively (64-bit quantities).
6337 * The new functions `strtof' and `strtold' parse floating-point values from
6338 strings, like `strtod', but they return `float' and `long double' values,
6339 respectively (on some machines `double' and `long double' are the same).
6341 * Ulrich Drepper has contributed new implementations of the floating-point
6342 printing and reading code used in the `printf' family of functions and
6343 `strtod', `strtof', and `strtold'. These new functions are perfectly
6344 accurate, and much faster than the old ones.
6346 * The implementation of the POSIX locale model was completely rewritten by
6347 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6348 to compile the POSIX locale definition.
6350 * The former dummy implementations of the strcoll and strxfrm function are
6351 now replaced by fully functional code contributed by Ulrich Drepper. The
6352 collation information comes from the POSIX locale definitions.
6354 * The new header <langinfo.h> defines an interface for accessing
6355 various locale-dependent data (using the locale chosen with `setlocale').
6357 * Ulrich Drepper has contributed a new suite of functions for operation on
6358 wide-character and multibyte-character strings, in <wchar.h>;
6359 and classification and case conversion of wide characters, in <wctype.h>.
6360 These new functions are conforming to the ISO C, Amendement 1 specification.
6362 * There is now a second implementation of the standard I/O library available.
6363 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6364 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6366 * You can now use positional parameter specifications in format strings
6367 for the `printf' and `scanf' families of functions. For example,
6368 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6369 ``Number 6, Mr Jones''. This is mainly useful when providing different
6370 format strings for different languages, whose grammars may dictate
6371 different orderings of the values being printed. To support this
6372 feature, the interface for `register_printf_handler' has changed; see
6373 the header file <printf.h> for details.
6375 * The `printf' and `scanf' families of functions now understand a new
6376 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6377 to group numbers as indicated by the locale; for `scanf' and friends, this
6378 says to accept as valid only a number with all the proper grouping
6379 separators in the right places. In the default "C" locale, numbers are
6380 not grouped; but locales for specific countries will define the usual
6381 conventions (i.e. separate thousands with `,' in the US locale).
6383 * The pgrp functions have been regularized, slightly incompatibly but much
6384 less confusingly. The core functions are now `getpgid' and `setpgid',
6385 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6386 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6387 provided for compatibility. There is no longer an incompatible `getpgrp'
6388 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6390 * The new header file <fts.h> and suite of functions simplify programs that
6391 operate on directory trees. This code comes from 4.4 BSD.
6393 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6394 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6395 NSS scheme used in glibc.
6397 * There is a new malloc debugging hook `__memalign_hook'.
6399 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6400 `unsigned int' in <sys/types.h>. These are for compatibility only and
6401 their use is discouraged.
6403 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6404 done differently, so that it works even without GNU ld.
6406 * New function `euidaccess' checks allowed access to a file like `access',
6407 but using the effective IDs instead of the real IDs.
6409 * The time zone data files have been updated for the latest and greatest
6410 local time conventions of the countries of the world.
6412 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6415 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6416 for formatting floating-point numbers. They are provided only for
6417 compatibility; new programs should use `sprintf' instead. There are
6418 also equivalent function for the `long double' floating-point type and
6419 all functions also exist in a reentrant form.
6421 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6422 functions for maintaining the login-record files (primarily of use to
6423 system programs such as `login'), and convenient functions for
6424 allocating and initializing a pseudo-terminal (pty) device.
6426 * Ulrich Drepper has contributed new support for System V style
6427 shared memory and IPC on systems that support it.
6429 * Ulrich Drepper has contributed several miscellaneous new functions found
6430 in System V: The `hsearch' family of functions provide an effective
6431 implementation of hash tables; `a64l' and `l64a' provide a very simple
6432 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6435 * Ulrich Drepper has contributed new reentrant counterparts for the
6436 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6438 * Ulrich Drepper has contributed new, highly-optimized versions of several
6439 string functions for the i486/Pentium family of processors.
6441 * Ulrich Drepper has updated the Linux-specific code, based largely
6442 on work done in Hongjiu Lu's version of GNU libc for Linux.
6443 The GNU library now supports Linux versions 2.0.10 and later,
6444 using the ELF object file format (i[3456]86-*-linux).
6446 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6448 * David Mosberger-Tang and Richard Henderson have ported the C library
6449 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6450 dynamic linking support for ELF/Alpha.
6452 * Richard Henderson contributed several Alpha optimized assembler function
6453 for arithmetic and string handling.
6455 * Ulrich Drepper has contributed a new set of message catalog functions to
6456 support multiple languages using the <libintl.h> interface, for use with
6457 his new package GNU gettext. Translation volunteers have contributed
6458 catalogs of the library's messages in Spanish, German, and Korean.
6460 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6461 program and the `catgets' function for reading the catalog files it
6462 creates. (The <libintl.h> interface is preferred; we include the
6463 <nl_types.h> interface using `catgets' only for source compatibility with
6464 programs already written to use it.)
6466 * New header file <values.h> gives SVID-compatible names for <limits.h>
6469 * Various new macros, declarations, and small header files for compatibility
6472 * New function `group_member' is a convenient way to check if a process has
6473 a given effective group ID.
6475 * When using GCC 2.7 and later, the socket functions are now declared in a
6476 special way so that passing an argument of type `struct sockaddr_in *',
6477 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6478 `struct sockaddr *' type, does not generate a type-clash warning.
6480 * New function `error' declared in header file <error.h> is a convenient
6481 function for printing error messages and optionally exiting; this is the
6482 canonical function used in GNU programs. The new functions `err', `warn',
6483 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6484 doing the same thing.
6486 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6487 POSIX.2 `glob' function to do ~ and {...} expansion.
6489 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6490 `clearenv' which is used in POSIX.9 is also available.
6492 * New function `getsid' returns session ID number on systems that support it.
6494 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6495 files <db.h> and <mpool.h> provide a rich set of functions for several
6496 types of simple databases stored in memory and in files, and <ndbm.h> is
6497 an old `ndbm'-compatible interface using the `db' functions. Link with
6498 `-ldb' to get these functions.
6500 * New macro `strdupa' copies a string like `strdup', but uses local stack
6501 space from `alloca' instead of dynamic heap space from `malloc'.
6503 * New function `strnlen' is like `strlen' but searches only a given maximum
6504 number of characters for the null terminator. `stpncpy', `strndup' and
6505 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6508 * New function `statfs' in header <sys/statfs.h>.
6510 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6511 provide convenient functions for operating on blocks of null-terminated
6514 * A new suite of functions in <utmp.h> handle all the details of reading
6515 and writing the utmp file.
6517 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6520 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6521 completely POSIX compliant and also implemented the extended functionality
6522 to handle alternate digit representation and alternate era date formats.
6524 * Ulrich Drepper provided an implementation of the `strptime' function
6525 defined in XPG4.2 which transforms a string into a `struct tm' value.
6527 * Paul Eggert provided the tzselect shell script as part of the timezone
6528 code. The shell script makes it easy to select the correct timezone
6531 * The implementation of the malloc family of functions is completely replaced
6532 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6533 The implementation uses the mmap function (if available) and it is
6534 optimized for the use in multi threaded programs.
6536 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6537 functions. This new functionality is usable by specifying a special
6538 salt string and it is compatible with implementation on *BSD systems.
6540 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6541 `getsubopt' to handle second level command line options, `bsd_signal'
6542 to access BSD style `signal' functionality, the obsolete `regexp' style
6545 * the `lchown' function is available on system which support this
6548 * The implementation of the shadow password handling function was contributed
6551 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6553 * POSIX.1g support was added. The <sys/select.h> header is available,
6554 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6555 implementation of `getaddrinfo'.
6559 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6561 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6562 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6564 * The new function `daemon' from 4.4 BSD is useful for server programs that
6565 want to put themselves in the background.
6567 * Joel Sherrill has contributed support for several standalone boards that
6568 run without an operating system.
6570 * `printf', `scanf' and friends now accept a `q' type modifier for long
6571 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6573 * All of the code taken from BSD (notably most of the math and networking
6574 routines) has been updated from the BSD 4.4-Lite release.
6576 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6578 * The new functions `getdomainname' and `setdomainname' fetch or change the
6579 YP/NIS domain name. These are system calls which exist on systems which
6582 * The time zone data files have been updated for the latest international
6585 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6586 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6590 * The C library now includes support for Sun RPC, from Sun's free
6591 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6592 are included. (There is still no support for YP.)
6594 * Tom Quinn has contributed a port of the C library to SGI machines running
6595 Irix 4 (mips-sgi-irix4).
6597 * The new `lockf' function is a simplified interface to the locking
6598 facilities of `fcntl', included for compatibility.
6600 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6602 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6604 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6607 * The error message printed by `assert' for a failed assertion now includes
6608 the name of the program (if using GNU ld) and the name of the calling
6609 function (with versions of GCC that support this).
6611 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6613 * The library now includes the <sys/mman.h> header file and memory
6614 management functions `mmap', `munmap', `mprotect', `msync', and
6615 `madvise', on systems that support those facilities.
6617 * The interface for `mcheck' has changed slightly: the function called to
6618 abort the program when an allocation inconsistency is detected now takes
6619 an argument that indicates the type of failure. The new function
6620 `mprobe' lets you request a consistency check for a particular block at
6621 any time (checks are normally done only when you call `free' or `realloc'
6624 * It is now possible to easily cross-compile the C library, building on one
6625 system a library to run on another machine and/or operating system. All
6626 you need to do is set the variable `HOST_CC' in `configparms' to the
6627 native compiler for programs to run on the machine you are building on (a
6628 few generator programs are used on Unix systems); set `CC' to the
6631 * The new function `fexecve' (only implemented on the GNU system) executes
6632 a program file given a file descriptor already open on the file.
6636 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6637 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6639 * You can set the variable `libprefix' in `configparms' to specify a prefix
6640 to be prepended to installed library files; this makes it easy to install
6641 the GNU C library to be linked as `-lgnuc' or whatever.
6643 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6644 copies a limited number of characters from a string, and returns the
6645 address of the last character written.
6647 * You no longer need to check for whether the installed `stddef.h' is
6648 compatible with the GNU C library. configure now checks for you.
6650 * You can now define a per-stream `fileno' function to convert the
6651 stream's cookie into an integral file descriptor.
6653 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6654 allocates zero bytes of storage, and returns a unique pointer which
6655 you can pass to `realloc' or `free'. The behavior is undefined if
6656 you dereference this pointer.
6658 * The C library now runs on Sony NEWS m68k machines running either
6659 NewsOS 3 or NewsOS 4.
6661 * The new `syscall' function is a system-dependent primitive function
6662 for invoking system calls. It has the canonical behavior on Unix
6663 systems, including unreliable return values for some calls (such as
6664 `pipe', `fork' and `getppid').
6666 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6667 to `EAGAIN', which is the preferred name. On systems whose kernels
6668 use two distinct codes, the C library now translates EWOULDBLOCK to
6669 EAGAIN in every system call function.
6673 * The GNU C Library Reference Manual is now distributed with the library.
6674 `make dvi' will produce a DVI file of the printed manual.
6675 `make info' will produce Info files that you can read on line using C-h i
6676 in Emacs or the `info' program.
6677 Please send comments on the manual to bug-glibc-manual@gnu.org.
6679 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6681 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6683 * Jason Merrill has contributed a port to the Sequent Symmetry running
6684 Dynix version 3 (i386-sequent-dynix).
6686 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6687 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6689 * New function `memory_warnings' lets you arrange to get warnings when
6690 malloc is running out of memory to allocate, like Emacs gives you.
6692 * The C library now contains the relocating allocator used in Emacs 19 for
6693 its editing buffers. This allocator (ralloc) minimizes allocation
6694 overhead and fragmentation by moving allocated regions around whenever it
6695 needs to. You always refer to a ralloc'd region with a "handle" (a
6696 pointer to a pointer--an object of type `void **').
6698 * There is a new `printf' format: `%m' gives you the string corresponding
6699 to the error code in `errno'.
6701 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6702 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6703 pass, the `a' modifier says to fill in a `char **' you pass with a
6706 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6707 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6708 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6710 * `mkstemp' is a traditional Unix function to atomically create and open a
6711 uniquely-named temporary file.
6715 * The standard location for the file that says what the local timezone is
6716 has changed again. It is now `/usr/local/etc/localtime' (or more
6717 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6719 * The distribution no longer contains any files with names longer than 14
6722 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6723 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6725 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6729 * The configuration process has changed quite a bit. The `configure'
6730 script is now used just like the configuration scripts for other GNU
6731 packages. The `sysdeps' directory hierarchy is much rearranged.
6732 The file `INSTALL' explains the new scheme in detail.
6734 * The header files no longer need to be processed into ANSI C and
6735 traditional C versions. There is just one set of files to install, and
6736 it will work with ANSI or old C compilers (including `gcc -traditional').
6738 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6739 MIPS DECStation running Ultrix 4.
6741 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6742 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6743 made itself into a shared library.
6745 * Yet further improved support for the i386, running 4.3 BSD-like systems
6746 (such as Mach 3 with the Unix single-server), or System V.
6748 * New function `strncasecmp' to do case-insensitive string comparison
6749 with limited length.
6751 * New function `strsep' is a reentrant alternative to `strtok'.
6753 * New functions `scandir' and `alphasort' for searching directories.
6755 * New function `setenv' is a better interface to `putenv'.
6757 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6758 function for traversing a directory tree.
6760 * The GNU obstack package is now also part of the C library.
6761 The new function `open_obstack_stream' creates a stdio stream that
6762 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6763 formatted output directly to an obstack.
6765 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6766 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6768 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6770 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6771 things to your strings.
6773 * There are some new test programs: test-fseek, testmb, and testrand.
6775 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6776 These ports are not finished, but are a good starting place for really
6777 supporting those systems.
6779 * `/etc/localtime' is now the standard location for the file that says what
6780 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6781 This follows the general principle that `/etc' is the place for all local
6782 configuration files.
6784 * The C library header files now use `extern "C"' when used by the C++
6785 compiler, so the C library should now work with C++ code.
6787 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6788 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6791 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6792 function which uses the `merge sort' algorithm, and is said to be
6793 significantly faster than the old GNU `qsort' function. Merge sort is
6794 now the standard `qsort' function. The new algorithm can require a lot
6795 of temporary storage; so, the old sorting function is called when the
6796 required storage is not available.
6798 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6799 provides the Unix `crypt' function, plus some other entry points.
6801 * The code and header files taken from 4.4 BSD have been updated with the
6802 latest files released from Berkeley.
6804 ----------------------------------------------------------------------
6807 Permission is granted to anyone to make or distribute verbatim copies
6808 of this document as received, in any medium, provided that the
6809 copyright notice and this permission notice are preserved,
6810 thus giving the recipient permission to redistribute in turn.
6812 Permission is granted to distribute modified versions
6813 of this document, or of portions of it,
6814 under the above conditions, provided also that they
6815 carry prominent notices stating who last changed them.
6818 version-control: never