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 * printf-family functions now support the %b format for output of
55 integers in binary, as specified in draft ISO C2X, and the %B variant
56 of that format recommended by draft ISO C2X.
58 * A new DSO sorting algorithm has been added in the dynamic linker that uses
59 topological sorting by depth-first search (DFS), solving performance issues
60 of the existing sorting algorithm when encountering particular circular
61 object dependency cases.
63 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between the two
64 DSO sorting algorithms. The default setting of '1' uses the current existing
65 algorithm, while a value of '2' selects the new DFS-based algorithm.
67 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
68 to be used by compilers for optimizing usage of 'memcmp' when its
69 return value is only used for its boolean status.
71 Deprecated and removed features, and other changes affecting compatibility:
73 * The r_version update in the debugger interface makes the glibc binary
74 incompatible with GDB binaries built without the following commits:
76 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
77 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
79 when audit modules or dlmopen are used.
81 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
83 Changes to build and runtime requirements:
85 [Add changes to build and runtime requirements here]
87 Security related changes:
89 [Add security related changes here]
91 The following bugs are resolved with this release:
93 [The release manager will add the list generated by
94 scripts/list-fixed-bugs.py just before the release.]
101 * In order to support smoother in-place-upgrades and to simplify
102 the implementation of the runtime all functionality formerly
103 implemented in the libraries libpthread, libdl, libutil, libanl has
104 been integrated into libc. New applications do not need to link with
105 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
106 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
107 provided, so that the linker options keep working. Applications which
108 have been linked against glibc 2.33 or earlier continue to load the
109 corresponding shared objects (which are now empty). The integration
110 of those libraries into libc means that additional symbols become
111 available by default. This can cause applications that contain weak
112 references to take unexpected code paths that would only have been
113 used in previous glibc versions when e.g. preloading libpthread.so.0,
114 potentially exposing application bugs.
116 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
117 PTHREAD_STACK_MIN is no longer constant and is redefined to
118 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
119 sets for modern architectural features like Arm SVE.
121 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
122 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
123 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
124 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
125 dynamic sized register sets for modern architectural features like
128 * The dynamic linker implements the --list-diagnostics option, printing
129 a dump of information related to IFUNC resolver operation and
130 glibc-hwcaps subdirectory selection.
132 * On Linux, the function execveat has been added. It operates similar to
133 execve and it is is already used to implement fexecve without requiring
134 /proc to be mounted. However, different than fexecve, if the syscall is not
135 supported by the kernel an error is returned instead of trying a fallback.
137 * The ISO C2X function timespec_getres has been added.
139 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
140 C2X, is supported to enable declarations of functions defined in Annex F
141 of C2X. Those declarations are also enabled when
142 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
143 defined, and when _GNU_SOURCE is defined.
145 * On powerpc64*, glibc can now be compiled without scv support using the
146 --disable-scv configure option.
148 * Add support for 64-bit time_t on configurations like x86 where time_t
149 is traditionally 32-bit. Although time_t still defaults to 32-bit on
150 these configurations, this default may change in future versions.
151 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
152 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
153 only enabled for Linux and the full support requires a minimum kernel
156 * The main gconv-modules file in glibc now contains only a small set of
157 essential converter modules and the rest have been moved into a supplementary
158 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
159 in the same GCONV_PATH. Similarly, external converter modules directories
160 may have supplementary configuration files in a gconv-modules.d directory
161 with names ending with .conf to logically classify the converter modules in
164 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
165 to configure the size of the thread stack cache.
167 * The function _Fork has been added as an async-signal-safe fork replacement
168 since Austin Group issue 62 droped the async-signal-safe requirement for
169 fork (and it will be included in the future POSIX standard). The new _Fork
170 function does not run any atfork function neither resets any internal state
171 or lock (such as the malloc one), and only sets up a minimal state required
172 to call async-signal-safe functions (such as raise or execve). This function
173 is currently a GNU extension.
175 * On Linux, the close_range function has been added. It allows efficiently
176 closing a range of file descriptors on recent kernels (version 5.9).
178 * The function closefrom has been added. It closes all file descriptors
179 greater than or equal to a given integer. This function is a GNU extension,
180 although it is also present in other systems.
182 * The posix_spawn_file_actions_addclosefrom_np function has been added,
183 enabling posix_spawn and posix_spawnp to close all file descriptors greater
184 than or equal to a given integer. This function is a GNU extension,
185 although Solaris also provides a similar function.
187 Deprecated and removed features, and other changes affecting compatibility:
189 * The function pthread_mutex_consistent_np has been deprecated; programs
190 should use the equivalent standard function pthread_mutex_consistent
193 * The function pthread_mutexattr_getrobust_np has been deprecated;
194 programs should use the equivalent standard function
195 pthread_mutexattr_getrobust instead.
197 * The function pthread_mutexattr_setrobust_np has been deprecated;
198 programs should use the equivalent standard function
199 pthread_mutexattr_setrobust instead.
201 * The function pthread_yield has been deprecated; programs should use
202 the equivalent standard function sched_yield instead.
204 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
206 * Various rarely-used functions declared in <resolv.h> and
207 <arpa/nameser.h> have been deprecated. Applications are encouraged to
208 use dedicated DNS processing libraries if applicable. For <resolv.h>,
209 this affects the functions dn_count_labels, fp_nquery, fp_query,
210 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
211 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
212 p_type, putlong, putshort, res_hostalias, res_isourserver,
213 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
214 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
215 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
216 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
218 * Various symbols previously defined in libresolv have been moved to libc
219 in order to prepare for libresolv moving entirely into libc (see earlier
220 entry for merging libraries into libc). The symbols __dn_comp,
221 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
222 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
223 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
224 __res_search, __res_send formerly in libresolv have been renamed and no
225 longer have a __ prefix. They are now available in libc.
227 * The pthread cancellation handler is now installed with SA_RESTART and
228 pthread_cancel will always send the internal SIGCANCEL on a cancellation
229 request. It should not be visible to applications since the cancellation
230 handler should either act upon cancellation (if asynchronous cancellation
231 is enabled) or ignore the cancellation internal signal. However there are
232 buggy kernel interfaces (for instance some CIFS versions) that could still
233 see a spurious EINTR error when cancellation interrupts a blocking syscall.
235 * Previously, glibc installed its various shared objects under versioned
236 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
237 were provided as symbolic links. Starting with glibc 2.34, the shared
238 objects are installed under their ABI sonames directly, without
239 symbolic links. This increases compatibility with distribution
240 package managers that delete removed files late during the package
241 upgrade or downgrade process.
243 * The symbols mallwatch and tr_break are now deprecated and no longer used in
244 mtrace. Similar functionality can be achieved by using conditional
245 breakpoints within mtrace functions from within gdb.
247 * The __morecore and __after_morecore_hook malloc hooks and the default
248 implementation __default_morecore have been removed from the API. Existing
249 applications will continue to link against these symbols but the interfaces
250 no longer have any effect on malloc.
252 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
253 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
254 disabled by default in the main C library. Users looking to use these
255 features now need to preload a new debugging DSO libc_malloc_debug.so to get
256 this functionality back.
258 * The deprecated functions malloc_get_state and malloc_set_state have been
259 moved from the core C library into libc_malloc_debug.so. Legacy applications
260 that still use these functions will now need to preload libc_malloc_debug.so
261 in their environment using the LD_PRELOAD environment variable.
263 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
264 __memalign_hook and __free_hook are now removed from the API. Compatibility
265 symbols are present to support legacy programs but new applications can no
266 longer link to these symbols. These hooks no longer have any effect on glibc
267 functionality. The malloc debugging DSO libc_malloc_debug.so currently
268 supports hooks and can be preloaded to get this functionality back for older
269 programs. However this is a transitional measure and may be removed in a
270 future release of the GNU C Library. Users may port away from these hooks by
271 writing and preloading their own malloc interposition library.
273 Changes to build and runtime requirements:
275 * On Linux, the shm_open, sem_open, and related functions now expect the
276 file shared memory file system to be mounted at /dev/shm. These functions
277 no longer search among the system's mount points for a suitable
278 replacement if /dev/shm is not available.
280 Security related changes:
282 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
283 a request for netgroup lookup, may crash due to a double-free,
284 potentially resulting in degraded service or Denial of Service on the
285 local system. Reported by Chris Schanzle.
287 CVE-2021-33574: The mq_notify function has a potential use-after-free
288 issue when using a notification type of SIGEV_THREAD and a thread
289 attribute with a non-default affinity mask.
291 CVE-2021-35942: The wordexp function may overflow the positional
292 parameter number when processing the expansion resulting in a crash.
293 Reported by Philippe Antoine.
295 The following bugs are resolved with this release:
297 [4737] libc: fork is not async-signal-safe
298 [5781] math: Slow dbl-64 sin/cos/sincos for special values
299 [10353] libc: Methods for deleting all file descriptors greater than
300 given integer (closefrom)
301 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
302 name containing multi-byte character(s)
303 [14469] math: Inaccurate j0f function
304 [14470] math: Inaccurate j1f function
305 [14471] math: Inaccurate y0f function
306 [14472] math: Inaccurate y1f function
307 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
309 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
310 crashes if it fails dlsym() twice
311 [15648] nptl: multiple definition of `__lll_lock_wait_private'
312 [16063] nptl: Provide a pthread_once variant in libc directly
313 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
314 [17145] libc: syslog with LOG_CONS leaks console file descriptor
315 [17183] manual: description of ENTRY struct in <search.h> in glibc
317 [18435] nptl: pthread_once hangs when init routine throws an exception
318 [18524] nptl: Missing calloc error checking in
319 __cxa_thread_atexit_impl
320 [19329] dynamic-link: dl-tls.c assert failure at concurrent
321 pthread_create and dlopen
322 [19366] nptl: returning from a thread should disable cancellation
323 [19511] nptl: 8MB memory leak in pthread_create in case of failure
324 when non-root user changes priority
325 [20802] dynamic-link: getauxval NULL pointer dereference after static
327 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
328 [22057] malloc: malloc_usable_size is broken with mcheck
329 [22668] locale: LC_COLLATE: the last character of ellipsis is not
331 [23323] libc: [RFE] CSU startup hardening.
332 [23328] malloc: Remove malloc hooks and ensure related APIs return no
334 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
335 $PLATFORM, $ORIGIN) crashes
336 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
337 [23554] nptl: pthread_getattr_np reports wrong stack size with
339 [24106] libc: Bash interpreter in ldd script is taken from host
340 [24773] dynamic-link: dlerror in an secondary namespace does not use
341 the right free implementation
342 [25036] localedata: Update collation order for Swedish
343 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
344 shm_open to pick wrong directory
345 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
346 crash in IFUNC resolver due to stack canary (--enable-stack-
348 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
349 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
350 [27111] dynamic-link: pthread_create and tls access use link_map
351 objects that may be concurrently freed by dlclose
352 [27132] malloc: memusagestat is linked to system librt, leading to
353 undefined symbols on major version upgrade
354 [27136] dynamic-link: dtv setup at thread creation may leave an entry
356 [27249] libc: libSegFault.so does not output signal number properly
357 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
359 [27318] dynamic-link: glibc fails to load binaries when built with
360 -march=sandybridge: CPU ISA level is lower than required
361 [27343] nss: initgroups() SIGSEGVs when called on a system without
362 nsswich.conf (in a chroot)
363 [27346] dynamic-link: x86: PTWRITE feature check is missing
364 [27389] network: NSS chroot hardening causes regressions in chroot
366 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
367 [27444] libc: sysconf reports unsupported option (-1) for
368 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
369 [27462] nscd: double-free in nscd (CVE-2021-27645)
370 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
371 malloc/tst-malloc-thread-fail
372 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
373 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
375 [27522] glob: glob, glob64 incorrectly marked as __THROW
376 [27555] dynamic-link: Static tests fail with --enable-stack-
378 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
379 information for the current directory
380 [27577] dynamic-link: elf/ld.so --help doesn't work
381 [27605] libc: tunables can't control xsave/xsavec selection in
383 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
384 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
386 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
387 _nss_files_getcanonname_r) from within a dlmopen namespace.
388 [27648] libc: FAIL: misc/tst-select
389 [27650] stdio: vfscanf returns too early if a match is longer than
391 [27651] libc: Performance regression after updating to 2.33
392 [27655] string: Wrong size calculation in string/test-strnlen.c
393 [27706] libc: select fails to update timeout on error
394 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
395 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
396 tries resolving them lazily
397 [27744] nptl: Support different libpthread/ld.so load orders in
399 [27749] libc: Data race __run_exit_handlers
400 [27761] libc: getconf: Segmentation fault when passing '-vq' as
402 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
403 exceeds maximum object size 2147483647
404 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
406 [27872] build: Obsolete configure option --enable-stackguard-
408 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
409 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
410 [27892] libc: powerpc: scv ABI error handling fails to check
412 [27896] nptl: mq_notify does not handle separately allocated thread
413 attributes (CVE-2021-33574)
414 [27901] libc: TEST_STACK_ALIGN doesn't work
415 [27902] libc: The x86-64 clone wrapper fails to align child stack
416 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
417 [27939] libc: aarch64: clone does not align the stack
418 [27968] libc: s390x: clone does not align the stack
419 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
420 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
422 [28028] malloc: malloc: tcache shutdown sequence does not work if the
423 thread never allocated anything
424 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
425 [28064] string: x86_64:wcslen implementation list has wcsnlen
426 [28067] libc: FAIL: posix/tst-spawn5
427 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
428 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
430 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
431 [28089] build: tst-tls20 fails when linker defaults to --as-needed
432 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
434 [28091] network: ns_name_skip may return 0 for domain names without
442 * The dynamic linker accepts the --list-tunables argument which prints
443 all the supported tunables. This option is disable if glibc is
444 configured with tunables disabled (--enable-tunables=no).
446 * The dynamic linker accepts the --argv0 argument and provides opportunity
447 to change argv[0] string.
449 * The dynamic linker loads optimized implementations of shared objects
450 from subdirectories under the glibc-hwcaps directory on the library
451 search path if the system's capabilities meet the requirements for
452 that subdirectory. Initially supported subdirectories include
453 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
454 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
455 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
456 subdirectory names correspond to the vendor-independent x86-64
457 microarchitecture levels defined in the x86-64 psABI supplement.
459 * The new --help option of the dynamic linker provides usage and
460 information and library search path diagnostics.
462 * The mallinfo2 function is added to report statistics as per mallinfo,
463 but with larger field widths to accurately report values that are
464 larger than fit in an integer.
466 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
468 * Support for the RISC-V ISA running on Linux has been expanded to run on
469 32-bit hardware. This is supported for the following ISA and ABI pairs:
475 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
478 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
479 glibc may use additional checks that may have an additional performance
480 overhead. At present these checks are available only on LLVM 9 and later.
481 The latest GCC available at this time (10.2) does not support this level of
484 Deprecated and removed features, and other changes affecting compatibility:
486 * The mallinfo function is marked deprecated. Callers should call
489 * When dlopen is used in statically linked programs, alternative library
490 implementations from HWCAP subdirectories are no longer loaded.
491 Instead, the default implementation is used.
493 * The deprecated <sys/vtimes.h> header and the function vtimes have been
494 removed. To support old binaries, the vtimes function continues to exist
495 as a compatibility symbol. Applications should use the getrlimit or
498 * Following a change in the tzdata 2018a release upstream, the zdump
499 program is now installed in the /usr/bin subdirectory. Previously,
500 the /usr/sbin subdirectory was used.
502 * On s390(x), the type float_t is now derived from the macro
503 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
504 hardcoded to double. This does not affect the ABI of any libraries
505 that are part of the GNU C Library, but may affect the ABI of other
506 libraries that use this type in their interfaces. The new definition
507 improves consistency with compiler behavior in many scenarios.
509 * A future version of glibc will stop loading shared objects from the
510 "tls" subdirectories on the library search path, the subdirectory that
511 corresponds to the AT_PLATFORM system name, and also stop employing
512 the legacy AT_HWCAP search mechanism. Applications should switch to
513 the new glibc-hwcaps mechanism instead; if they do not do that, only
514 the baseline version (directly from the search path directory) will be
517 Changes to build and runtime requirements:
519 * On Linux, the system administrator needs to configure /dev/pts with
520 the intended access modes for pseudo-terminals. glibc no longer
521 attemps to adjust permissions of terminal devices. The previous glibc
522 defaults ("tty" group, user read/write and group write) already
523 corresponded to what most systems used, so that grantpt did not
524 perform any adjustments.
526 * On Linux, the posix_openpt and getpt functions no longer attempt to
527 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
528 (and pseudo-terminals are supported), a devpts file system is mounted
529 on /dev/pts. Current systems already meet these requirements.
531 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
533 Security related changes:
535 CVE-2021-3326: An assertion failure during conversion from the
536 ISO-20220-JP-3 character set using the iconv function has been fixed.
537 This assertion was triggered by certain valid inputs in which the
538 converted output contains a combined sequence of two wide characters
539 crossing a buffer boundary. Reported by Tavis Ormandy.
541 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
542 invoked with input containing redundant shift sequences in the IBM1364,
543 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
545 CVE-2020-29562: An assertion failure has been fixed in the iconv function
546 when invoked with UCS4 input containing an invalid character.
548 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
549 invoked with EUC-KR input containing invalid multibyte input sequences.
551 The following bugs are resolved with this release:
553 [10635] libc: realpath portability patches
554 [16124] dynamic-link: ld.so should allow to change argv[0]
555 [17924] malloc: 'free' should not set errno
556 [18683] libc: Linux faccessat implementation can incorrectly ignore
558 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
559 [23091] hurd: missing waitid support
560 [23249] libc: Epyc and other current AMD CPUs do not select the
561 "haswell" platform subdirectory
562 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
564 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
566 [24941] libc: Make grantpt usable after multi-threaded fork in more
568 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
569 [24973] locale: iconv encounters segmentation fault when converting
570 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
571 [25399] string: undefined reference to `__warn_memset_zero_len' when
572 changing gnuc version
573 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
575 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
577 [25971] libc: s390 bits/hwcap.h out of sync with kernel
578 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
579 [26100] libc: Race in syslog(3) with regards to tag printing.
580 [26124] libc: Export <cpu-features.h>
581 [26130] nscd: Inconsistent nscd cache during pruning
582 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
583 [26224] locale: iconv hangs when converting some invalid inputs from
584 several IBM character sets (CVE-2020-27618)
585 [26341] libc: realpath cyclically call __alloca(path_max) to consume
587 [26343] manual: invalid documented return type for strerrorname_np(),
588 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
589 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
591 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
593 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
594 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
596 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
597 [26553] libc: mtx_init allows type set to "mtx_recursive" only
598 [26555] string: strerrorname_np does not return the documented value
599 [26592] libc: pointer arithmetic overflows in realpath
600 [26600] network: Transaction ID collisions cause slow DNS lookups in
602 [26606] libc: [2.33 Regression] pselect is broken on x32
603 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
604 [26620] glob: fnmatch with collating symbols results in segmentation
606 [26625] libc: [2.33 Regression] CET is disabled
607 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
608 at the end of a memory mapping
609 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
610 by the caller to the kernel
611 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
612 [26647] build: [-Werror=array-parameter=] due to different
613 declarations for __sigsetjmp
614 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
616 [26649] stdio: printf should handle non-normal x86 long double numbers
617 gracefully (CVE-2020-29573)
618 [26686] build: -Warray-parameter instances building with GCC 11
619 [26687] build: -Warray-bounds instances building with GCC 11
620 [26690] stdio: Aliasing violation in __vfscanf_internal
621 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
622 [26726] build: GCC warning calling new_composite_name with an array of
624 [26736] libc: FAIL: misc/tst-sysvshm-linux
625 [26737] libc: Random FAIL: rt/tst-shm
626 [26791] libc: Missing O_CLOEXEC in sysconf.c
627 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
629 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
631 [26818] string: aarch64: string tests may run ifunc variants that are
633 [26821] libc: Memory leak test failures on Fedora 33
634 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
635 FSGSBASE/LM/RDRAND check failure
636 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
638 [26853] libc: aarch64: Missing unwind information in statically linked
640 [26923] locale: Assertion failure in iconv when converting invalid
641 UCS4 (CVE-2020-29562)
642 [26926] dynamic-link: aarch64: library dependencies are not bti
644 [26932] libc: sh: Multiple floating point functions defined as stubs
646 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
648 [26988] dynamic-link: aarch64: BTI mprotect address is not page
650 [27002] build: libc_freeres_fn build failure with GCC 11
651 [27004] dynamic-link: ld.so is miscompiled by GCC 11
652 [27008] dynamic-link: ld.so.cache should have endianness markup
653 [27042] libc: [alpha] anonymous union in struct stat confuses
655 [27053] libc: Conformance regression in system(3) (and probably also
657 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
659 [27077] network: Do not reload /etc/nsswitch.conf from chroot
660 [27083] libc: Unsafe unbounded alloca in addmntent
661 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
663 [27130] string: "rep movsb" performance issue
664 [27150] libc: alpha: wait4() is unavailable in static linking
665 [27177] dynamic-link:
666 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
668 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
669 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
670 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
671 related to combining characters (CVE-2021-3326)
678 * Unicode 13.0.0 Support: Character encoding, character type info, and
679 transliteration tables are all updated to Unicode 13.0.0, using
680 generator scripts contributed by Mike FABIAN (Red Hat).
682 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
684 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
685 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
686 Three ABIs are supported:
692 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
693 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
695 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
696 DT_DEPAUDIT dynamic section entries of the main executable.
698 * powerpc64le supports IEEE128 long double libm/libc redirects when
699 using -mabi=ieeelongdouble to compile C code on supported GCC
700 toolchains. It is recommended to use GCC 8 or newer when testing
703 * To help detect buffer overflows and other out-of-bounds accesses
704 several APIs have been annotated with GCC 'access' attribute. This
705 should help GCC 10 issue better warnings.
707 * On Linux, functions pthread_attr_setsigmask_np and
708 pthread_attr_getsigmask_np have been added. They allow applications
709 to specify the signal mask of a thread created with pthread_create.
711 * The GNU C Library now provides the header file <sys/single_threaded.h>
712 which declares the variable __libc_single_threaded. Applications are
713 encouraged to use this variable for single-thread optimizations,
714 instead of weak references to symbols historically defined in
717 * The functions sigabbrev_np and sigdescr_np have been added. The
718 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
719 SIGHUP) while sigdescr_np returns a string describing the signal number
720 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
721 attempt to translate the return description, both functions return
722 NULL for an invalid signal number.
724 They should be used instead of sys_siglist or sys_sigabbrev and they
725 are both thread and async-signal safe. These functions are GNU extensions.
727 * The functions strerrorname_np and strerrordesc_np have been added. The
728 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
729 while strerrordesc_np returns a string describing the error number
730 (e.g "Invalid argument" for EINVAL). Different than strerror,
731 strerrordesc_np does not attempt to translate the return description, both
732 functions return NULL for an invalid error number.
734 They should be used instead of sys_errlist and sys_nerr, both are
735 thread and async-signal safe. These functions are GNU extensions.
737 * AArch64 now supports standard branch protection security hardening
738 in glibc when it is built with a GCC that is configured with
739 --enable-standard-branch-protection (or if -mbranch-protection=standard
740 flag is passed when building both GCC target libraries and glibc,
741 in either case a custom GCC is needed). This includes branch target
742 identification (BTI) and pointer authentication for return addresses
743 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
744 extensions respectively for the protection to be effective,
745 otherwise the used instructions are nops. User code can use PAC-RET
746 without libc support, but BTI requires a libc that is built with BTI
747 support, otherwise runtime objects linked into user code will not be
750 Deprecated and removed features, and other changes affecting compatibility:
752 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
753 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
754 RPC header files. Backward compatibility for old programs is kept
755 only for architectures and ABIs that have been added in or before
756 glibc 2.31. New programs need to use TI-RPC
757 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
758 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
760 * Remove configure option --enable-obsolete-nsl. libnsl is only built
761 as shared library for backward compatibility and the NSS modules "nis"
762 and "nisplus" are not built at all and libnsl's headers aren't
763 installed. This compatibility is kept only for architectures and ABIs
764 that have been added in or before version 2.28. Replacement
765 implementations based on TI-RPC, which additionally support IPv6, are
766 available from <https://github.com/thkukuk/>. This change does not
767 affect the "compat" NSS module, which does not depend on libnsl
768 since 2.27 and thus can be used without NIS.
770 * The deprecated <sys/sysctl.h> header and the sysctl function have been
771 removed. To support old binaries, the sysctl function continues to
772 exist as a compatibility symbol (on those architectures which had it),
773 but always fails with ENOSYS. This reflects the removal of the system
774 call from all architectures, starting with Linux 5.5.
776 * The sstk function is no longer available to newly linked binaries.
777 Its implementation always returned with a failure, and the function
778 was not declared in any header file.
780 * The legacy signal handling functions siginterrupt, sigpause, sighold,
781 sigrelse, sigignore and sigset, and the sigmask macro have been
782 deprecated. Applications should use the sigsuspend, sigprocmask and
783 sigaction functions instead.
785 * ldconfig now defaults to the new format for ld.so.cache. glibc has
786 already supported this format for almost 20 years.
788 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
789 are no longer available to newly linked binaries, and their declarations
790 have been removed from <string.h>. They are exported solely as
791 compatibility symbols to support old binaries. All programs should use
794 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
795 are no longer available to newly linked binaries, and their declarations
796 have been removed from <stdio.h>. They are exported solely as
797 compatibility symbols to support old binaries. All programs should use
798 strerror or strerror_r instead.
800 * Both strerror and strerror_l now share the same internal buffer in the
801 calling thread, meaning that the returned string pointer may be invalided
802 or contents might be overwritten on subsequent calls in the same thread or
803 if the thread is terminated. It makes strerror MT-safe.
805 * Using weak references to libpthread functions such as pthread_create
806 or pthread_key_create to detect the singled-threaded nature of a
807 program is an obsolescent feature. Future versions of glibc will
808 define pthread_create within libc.so.6 itself, so such checks will
809 always flag the program as multi-threaded. Applications should check
810 the __libc_single_threaded variable declared in
811 <sys/single_threaded.h> instead.
813 * The "files" NSS module no longer supports the "key" database (used for
814 secure RPC). The contents of the /etc/publickey file will be ignored,
815 regardless of the settings in /etc/nsswitch.conf. (This method of
816 storing RPC keys only supported the obsolete and insecure AUTH_DES
817 flavor of secure RPC.)
819 * The __morecore and __after_morecore_hook malloc hooks and the default
820 implementation __default_morecore have been deprecated. Applications
821 should use malloc interposition to change malloc behavior, and mmap to
822 allocate anonymous memory. A future version of glibc may require that
823 applications which use the malloc hooks must preload a special shared
824 object, to enable the hooks.
826 * The hesiod NSS module has been deprecated and will be removed in a
827 future version of glibc. System administrators are encouraged to
828 switch to other approaches for networked account databases, such as
831 Changes to build and runtime requirements:
833 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
834 long double redirects.
836 Security related changes:
838 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
839 invoked with the -c option and when processing invalid multi-byte input
840 sequences. Reported by Jan Engelhardt.
842 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
843 corruption when they were passed a pseudo-zero argument. Reported by Guido
844 Vranken / ForAllSecure Mayhem.
846 CVE-2020-1752: A use-after-free vulnerability in the glob function when
847 expanding ~user has been fixed.
849 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
850 memmove functions has been fixed. Discovered by Jason Royes and Samual
851 Dytrych of the Cisco Security Assessment and Penetration Team (See
854 The following bugs are resolved with this release:
856 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
857 [10441] manual: Backtraces code example lacks error checking
858 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
859 timer_sigev_thread dangerous
860 [14231] stdio: stdio-common tests memory requirements
861 [14578] libc: /proc-based emulation for lchmod, fchmodat
862 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
863 filtee has constructor
864 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
865 sequences (CVE-2016-10228)
866 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
867 character entities for infinity & pi
868 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
869 segfaults in applications
870 [20543] libc: Please move from .gnu.linkonce to comdat
871 [22489] network: gcc warns about implicit convertion in
872 ICMP6_FILTER_SETPASS with -Wsign-conversion
873 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
874 [23294] math: Complex _FloatN functions are redirected to the wrong
875 function with -mlong-double-64
876 [23296] libc: Data race in setting function descriptor during lazy
878 [23668] dynamic-link: ldconfig: Default to the new format for
880 [23819] hurd: hurd: Add C11 thread support
881 [23990] build: test-container error out on failure to exec child.
882 [23991] build: shell-container typo in run_command_array
883 [24638] manual: Error in example of parsing a template string
884 [24654] manual: Wrong declaration of wcschr in libc manual
885 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
887 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
888 dynamically loaded dsos
889 [25098] nptl: nptl: ctype classification functions are not AS-Safe
890 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
892 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
893 restore EAX, ECX and EDX
894 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
895 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
896 [25420] network: Race condition in resolv_conf.c can result in caching
897 stale configuration forever
898 [25487] math: sinl() stack corruption from crafted input
900 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
902 [25523] libc: MIPS/Linux inline syscall template is miscompiled
903 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
905 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
906 on 32 bit and old kernel
907 [25635] libc: arm: Wrong sysdep order selection for soft-fp
908 [25639] localedata: Some names of days and months wrongly spelt in
910 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
911 amount of sigset_t bytes
912 [25691] stdio: printf: memory leak when printing long multibyte
914 [25715] libc: system() returns wrong errors when posix_spawn fails
915 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
916 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
917 state for conversions that produce two Unicode code points
918 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
919 for linux x86_64 leads to livelock
920 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
921 test failures, invalid instruction in ld.so
922 [25790] glob: Typo in tst-fnmatch.input
923 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
925 [25819] localedata: Update locale data to Unicode 13.0.0
926 [25824] libc: Abnormal function of strnlen in aarch64
927 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
928 [25896] libc: Incorrect prctl
929 [25902] libc: Bad LOADARGS_N
930 [25905] dynamic-link: VSX registers are corrupted during PLT
931 resolution when glibc is built with --disable-multi-arch and --with-
933 [25933] string: Off by one error in __strncmp_avx2 when
934 length=VEC_SIZE*4 and strings are at page boundaries can cause a
936 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
937 exiting detached thread
938 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
940 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
942 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
943 [26073] math: getpayload() has wrong return value
944 [26076] dynamic-link: dlmopen crashes after failing to load
945 dependencies in audit mode
946 [26120] localedata: column width of of some Korean
947 JUNGSEONG/JONGSEONG characters wrong (should be 0)
948 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
949 [26133] libc: Incorrect need_arch_feature_F16C
950 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
952 [26149] libc: PKU is usable only if OSPKE is set
953 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
955 [26208] libc: Incorrect bit_cpu_CLFSH
956 [26210] network: Incorrect use of hidden symbols for global sunrpc
958 [26211] stdio: printf integer overflow calculating allocation size
959 [26214] stdio: printf_fp double free
960 [26215] stdio: printf_fp memory leak
961 [26232] time: FAIL: support/tst-timespec for 32-bit targets
962 [26258] nss: nss_compat should not read input files with mmap
963 [26332] string: Incorrect cache line size load causes memory
971 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
972 enable features from the draft ISO C2X standard. Only some features from
973 this draft standard are supported by the GNU C Library, and as the draft
974 is under active development, the set of features enabled by this macro is
975 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
976 by compiling with "gcc -std=gnu2x".
978 * The <math.h> functions that round their results to a narrower type now
979 have corresponding type-generic macros in <tgmath.h>, as defined in TS
980 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
981 Clarification Request 13 to TS 18661-3.
983 * The function pthread_clockjoin_np has been added, enabling join with a
984 terminated thread with a specific clock. It allows waiting against
985 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
987 * New locale added: mnw_MM (Mon language spoken in Myanmar).
989 * The DNS stub resolver will optionally send the AD (authenticated data) bit
990 in queries if the trust-ad option is set via the options directive in
991 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
992 mode, the AD bit, as provided by the name server, is available to
993 applications which call res_search and related functions. In the default
994 mode, the AD bit is not set in queries, and it is automatically cleared in
995 responses, indicating a lack of DNSSEC validation. (Therefore, the name
996 servers and the network path to them are treated as untrusted.)
998 Deprecated and removed features, and other changes affecting compatibility:
1000 * The totalorder and totalordermag functions, and the corresponding
1001 functions for other floating-point types, now take pointer arguments to
1002 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1003 passing. This is in accordance with the resolution of Clarification
1004 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1005 floating-point arguments directly will continue to work.
1007 * The obsolete function stime is no longer available to newly linked
1008 binaries, and its declaration has been removed from <time.h>.
1009 Programs that set the system time should use clock_settime instead.
1011 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1012 in a future version of glibc. In this release, the header still exists
1013 but calling ftime will cause a compiler warning. All programs should use
1014 gettimeofday or clock_gettime instead.
1016 * The gettimeofday function no longer reports information about a
1017 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1018 many years, as it cannot handle the full complexity of the world's
1019 timezones, but hitherto we have supported it on a best-effort basis.
1020 Changes required to support 64-bit time_t on 32-bit architectures have
1021 made this no longer practical.
1023 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1024 should expect to receive a 'struct timezone' whose tz_minuteswest and
1025 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1026 happen on a few Linux-based ports. This will be corrected in a future
1029 All callers should supply a null pointer for the 'tzp' argument to
1030 gettimeofday. For accurate information about the time zone associated
1031 with the current time, use the localtime function.
1033 gettimeofday itself is obsolescent according to POSIX. We have no plans
1034 to remove access to this function, but portable programs should consider
1035 using clock_gettime instead.
1037 * The settimeofday function can still be used to set a system-wide time
1038 zone when the operating system supports it. This is because the Linux
1039 kernel reused the API, on some architectures, to describe a system-wide
1040 time-zone-like offset between the software clock maintained by the kernel,
1041 and the "RTC" clock that keeps time when the system is shut down.
1043 However, to reduce the odds of this offset being set by accident,
1044 settimeofday can no longer be used to set the time and the offset
1045 simultaneously. If both of its two arguments are non-null, the call
1046 will fail (setting errno to EINVAL).
1048 Callers attempting to set this offset should also be prepared for the call
1049 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1050 some Linux architectures. The Linux kernel maintainers are discussing a
1051 more principled replacement for the reused API. After a replacement
1052 becomes available, we will change settimeofday to fail with ENOSYS on all
1053 platforms when its 'tzp' argument is not a null pointer.
1055 settimeofday itself is obsolescent according to POSIX. Programs that set
1056 the system time should use clock_settime and/or the adjtime family of
1057 functions instead. We may cease to make settimeofday available to newly
1058 linked binaries after there is a replacement for Linux's time-zone-like
1061 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1062 the optional CAS instruction is implemented (for instance, LEON processors
1063 are still supported, but SuperSPARC processors are not).
1065 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1068 * If a lazy binding failure happens during dlopen, during the execution of
1069 an ELF constructor, the process is now terminated. Previously, the
1070 dynamic loader would return NULL from dlopen, with the lazy binding error
1071 captured in a dlerror message. In general, this is unsafe because
1072 resetting the stack in an arbitrary function call is not possible.
1074 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1075 executable stack unless explicitly configured at build time to require
1076 minimum kernel version 4.8 or newer. This is because executing
1077 floating-point branches on a non-executable stack on Linux kernels prior to
1078 4.8 can lead to application crashes for some MIPS configurations. While
1079 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1080 expected to enable non-executable stack by default with PT_GNU_STACK by
1081 default and is thus likely to trigger a crash on older kernels.
1083 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1084 non-executable stack while dropping support for older kernels.
1086 * System call wrappers for time system calls now use the new time64 system
1087 calls when available. On 32-bit targets, these wrappers attempt to call
1088 the new system calls first and fall back to the older 32-bit time system
1089 calls if they are not present. This may cause issues in environments
1090 that cannot handle unsupported system calls gracefully by returning
1091 -ENOSYS. Seccomp sandboxes are affected by this issue.
1093 Changes to build and runtime requirements:
1095 * It is no longer necessary to have recent Linux kernel headers to build
1096 working (non-stub) system call wrappers on all architectures except 64-bit
1097 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1099 * The ChangeLog file is no longer present in the toplevel directory of the
1100 source tree. ChangeLog files are located in the ChangeLog.old directory as
1101 ChangeLog.N where the highest N has the latest entries.
1103 Security related changes:
1105 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1106 out-of-bounds write when executed in a signal frame context.
1108 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1109 environment variable during program execution after a security
1110 transition, allowing local attackers to restrict the possible mapping
1111 addresses for loaded libraries and thus bypass ASLR for a setuid
1112 program. Reported by Marcin Kościelnicki.
1114 The following bugs are resolved with this release:
1116 [12031] localedata: iconv -t ascii//translit with Greek characters
1117 [15813] libc: Multiple issues in __gen_tempname
1118 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1119 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1120 [19767] libc: vdso is not used with static linking
1121 [19903] hurd: Shared mappings not being inherited by children processes
1122 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1123 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1125 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1126 Symbols-A/B Unicode blocks
1127 [23518] libc: Eliminate __libc_utmp_jump_table
1128 [24026] malloc: malloc_info() returns wrong numbers
1129 [24054] localedata: Many locales are missing date_fmt
1130 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1131 [24304] dynamic-link: Lazy binding failure during ELF
1132 constructors/destructors is not fatal
1133 [24376] libc: RISC-V symbol size confusion with _start
1134 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1136 [24824] libc: test-in-container does not install charmap files compatible
1138 [24844] regex: regex bad pointer / leakage if malloc fails
1139 [24867] malloc: Unintended malloc_info formatting changes
1140 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1141 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1142 [24882] libc: login: pututline uses potentially outdated cache
1143 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1144 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1146 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1148 [24930] dynamic-link: dlopen of PIE executable can result in
1149 _dl_allocate_tls_init assertion failure
1150 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1151 (stringop-overflow error)
1152 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1153 functions other can lead to crashes
1154 [24967] libc: jemalloc static linking causes runtime failure
1155 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1157 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1158 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1159 [25097] libc: new -Warray-bounds with GCC 10
1160 [25112] dynamic-link: dlopen must not make new objects accessible when it
1161 still can fail with an error
1162 [25139] localedata: Please add the new mnw_MM locale
1163 [25149] regex: Array bounds violation in proceed_next_node
1164 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1165 initialized correctly
1166 [25189] libc: glibc's __glibc_has_include causes issues with clang
1168 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1169 value to an unsigned
1170 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1171 binaries (CVE-2019-19126)
1172 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1174 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1176 [25232] string: <string.h> does not enable const correctness for strchr et
1178 [25233] localedata: Consider "." as the thousands separator for sl_SI
1180 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1181 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1182 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1184 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1185 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1187 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1188 (dl_initfirst) link map pointer
1189 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1190 [25423] libc: Array overflow in backtrace on powerpc
1191 [25425] network: Missing call to __resolv_context_put in
1192 getaddrinfo.c:gethosts
1199 * Unicode 12.1.0 Support: Character encoding, character type info, and
1200 transliteration tables are all updated to Unicode 12.1.0, using
1201 generator scripts contributed by Mike FABIAN (Red Hat).
1203 * The dynamic linker accepts the --preload argument to preload shared
1204 objects, in addition to the LD_PRELOAD environment variable.
1206 * The twalk_r function has been added. It is similar to the existing
1207 twalk function, but it passes an additional caller-supplied argument
1208 to the callback function.
1210 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1212 * Minguo (Republic of China) calendar support has been added as an
1213 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1216 * The entry for the new Japanese era has been added for ja_JP locale.
1218 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1219 pvalloc, memalign, and posix_memalign fail now with total object size
1220 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1221 pointer subtraction within the allocated object, where results might
1222 overflow the ptrdiff_t type.
1224 * The dynamic linker no longer refuses to load objects which reference
1225 versioned symbols whose implementation has moved to a different soname
1226 since the object has been linked. The old error message, symbol
1227 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1228 link time reference, is gone.
1230 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1231 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1232 functions. These behave similarly to their "timed" equivalents, but also
1233 accept a clockid_t parameter to determine which clock their timeout should
1234 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1235 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1236 time of the wait (unlike with pthread_condattr_setclock, which requires
1237 the clock choice at initialization time).
1239 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1240 work, new resolvers can use a second argument which can be extended in
1241 the future, currently it contains the AT_HWCAP2 value.
1243 Deprecated and removed features, and other changes affecting compatibility:
1245 * The copy_file_range function fails with ENOSYS if the kernel does not
1246 support the system call of the same name. Previously, user space
1247 emulation was performed, but its behavior did not match the kernel
1248 behavior, which was deemed too confusing. Applications which use the
1249 copy_file_range function can no longer rely on glibc to provide a fallback
1250 on kernels that do not support the copy_file_range system call, and if
1251 this function returns ENOSYS, they will need to use their own fallback.
1252 Support for copy_file_range for most architectures was added in version
1253 4.5 of the mainline Linux kernel.
1255 * The functions clock_gettime, clock_getres, clock_settime,
1256 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1257 for new applications (on architectures which had them). Instead, the
1258 definitions in libc will be used automatically, which have been available
1261 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1262 and <sys/stropts.h> have been removed.
1264 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1265 resolver flag (deprecated in glibc 2.25) have been removed.
1267 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1268 resolver have been removed from <resolv.h>.
1270 * With --enable-bind-now, installed programs are now linked with the
1273 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1274 configurations) has been removed, following the deprecation of this
1275 subarchitecture in version 8 of GCC, and its removal in version 9.
1277 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1278 header have been removed.
1280 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1281 deprecated and will be removed from a future version of glibc.
1282 Application should directly access /proc instead. For obtaining random
1283 bits, the getentropy function can be used.
1285 Changes to build and runtime requirements:
1287 * GCC 6.2 or later is required to build the GNU C Library.
1289 Older GCC versions and non-GNU compilers are still supported when
1290 compiling programs that use the GNU C Library.
1292 Security related changes:
1294 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1295 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1296 has undefined behavior. On x32, the size_t argument may be passed
1297 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1298 32 bits. When it happened with the sign bit of RDX register set,
1299 memcmp gave the wrong result since it treated the size argument as
1300 zero. Reported by H.J. Lu.
1302 CVE-2019-9169: Attempted case-insensitive regular-expression match
1303 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1304 over-read. Reported by Hongxu Chen.
1306 The following bugs are resolved with this release:
1308 [2872] locale: Transliteration Cyrillic -> ASCII fails
1309 [6399] libc: gettid() should have a wrapper
1310 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1311 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1312 [17396] localedata: globbing for locale by [[.collating-element.]]
1313 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1314 [18465] malloc: memusagestat is built using system C library
1315 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1316 invalid input drops valid char
1317 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1318 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1319 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1320 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1321 [23352] malloc: __malloc_check_init still defined in public header
1323 [23403] nptl: Wrong alignment of TLS variables
1324 [23501] libc: nftw() doesn't return dangling symlink's inode
1325 [23733] malloc: Check the count before calling tcache_get()
1326 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1328 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1329 [23844] nptl: pthread_rwlock_trywrlock results in hang
1330 [23983] argparse: Missing compat versions of argp_failure and argp_error
1331 for long double = double
1332 [23984] libc: Missing compat versions of err.h and error.h functions for
1333 long double = double
1334 [23996] localedata: Dutch salutations
1335 [24040] libc: riscv64: unterminated call chain in __thread_start
1336 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1338 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1339 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1341 [24114] regex: regexec buffer read overrun in "grep -i
1342 '\(\(\)*.\)*\(\)\(\)\1'"
1343 [24122] libc: Segfaults if 0 returned from la_version
1344 [24153] stdio: Some input functions do not react to stdin assignment
1345 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1346 RDX is set) (CVE-2019-7309)
1347 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1348 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1349 not the default "nor"
1350 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1351 false positives, change to modern flexible array
1352 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1353 instructions while maintaining the robust mutex list due to missing
1355 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1356 unnecessary librt dependencies
1357 [24200] localedata: Revert first_weekday removal in en_IE locale
1358 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1359 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1360 [24216] malloc: Check for large bin list corruption when inserting
1362 [24228] stdio: old x86 applications that use legacy libio crash on exit
1363 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1365 [24293] localedata: Missing Minguo calendar support for TW locales
1366 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1367 tt_RU (Tatar) locale
1368 [24307] localedata: Update locale data to Unicode 12.0.0
1369 [24323] dynamic-link: dlopen should not be able open PIE objects
1370 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1371 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1372 tt_RU (Tatar) locale
1373 [24370] localedata: Add lang_name for tt_RU locale
1374 [24372] locale: Binary locale files are not architecture independent
1375 [24394] time: strptime %Ey mis-parses final year of era
1376 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1378 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1380 [24531] malloc: Malloc tunables give tcache assertion failures
1381 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1383 [24535] localedata: Update locale data to Unicode 12.1.0
1384 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1385 kernels and break testing
1386 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1387 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1388 [-Werror=format-overflow=]
1389 [24570] libc: alpha: compat msgctl uses __IPC_64
1390 [24584] locale: Data race in __wcsmbs_clone_conv
1391 [24588] stdio: Remove codecvt vtables from libio
1392 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1394 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1395 [24632] stdio: Old binaries which use freopen with default stdio handles
1397 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1399 [24652] localedata: szl_PL spelling correction
1400 [24695] nss: nss_db: calling getpwent after endpwent crashes
1401 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1402 in /etc/nsswitch.conf
1403 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1404 [24740] libc: getdents64 type confusion
1405 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1406 always implemented in the same library
1407 [24744] libc: Remove copy_file_range emulation
1408 [24757] malloc: memusagestat is linked against system libpthread
1409 [24794] libc: Partial test suite run builds corrupt test-in-container
1417 * The getcpu wrapper function has been added, which returns the currently
1418 used CPU and NUMA node. This function is Linux-specific.
1420 * A new convenience target has been added for distribution maintainers
1421 to build and install all locales as directories with files. The new
1422 target is run by issuing the following command in your build tree:
1423 'make localedata/install-locale-files', with an optional DESTDIR
1424 to set the install root if you wish to install into a non-default
1425 configured location.
1427 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1429 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1430 for _GNU_SOURCE, to match BSD environments.
1432 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1433 indicates that it will abort the transaction prior to entering the kernel
1434 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1435 suspended, and this caused some undefined side-effects issues by aborting
1436 transactions manually. Glibc avoided it by abort transactions manually on
1437 each syscall, but it lead to performance issues on newer kernels where the
1438 HTM state is saved and restore lazily (the state being saved even when the
1439 process actually does not use HTM).
1441 * The functions posix_spawn_file_actions_addchdir_np and
1442 posix_spawn_file_actions_addfchdir_np have been added, enabling
1443 posix_spawn and posix_spawnp to run the new process in a different
1444 directory. These functions are GNU extensions. The function
1445 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1448 * The popen and system do not run atfork handlers anymore (BZ#17490).
1449 Although it is a possible POSIX violation, the POSIX rationale in
1450 pthread_atfork documentation regarding atfork handlers is to handle
1451 inconsistent mutex state after a fork call in a multi-threaded process.
1452 In both popen and system there is no direct access to user-defined mutexes.
1454 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1455 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1457 - C-SKY ABIV2 soft-float little-endian
1458 - C-SKY ABIV2 hard-float little-endian
1460 * strftime's default formatting of a locale's alternative year (%Ey)
1461 has been changed to zero-pad the year to a minimum of two digits,
1462 like "%y". This improves the display of Japanese era years during
1463 the first nine years of a new era, and is expected to be harmless
1464 for all other locales (only Japanese locales regularly have
1465 alternative year numbers less than 10). Zero-padding can be
1466 overridden with the '_' or '-' flags (which are GNU extensions).
1468 * As a GNU extension, the '_' and '-' flags can now be applied to
1469 "%EY" to control how the year number is formatted; they have the
1470 same effect that they would on "%Ey".
1472 Deprecated and removed features, and other changes affecting compatibility:
1474 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1475 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1477 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1478 in <sys/procfs.h>, has been corrected to match the type actually used by
1479 the Linux kernel. This affects the size and layout of that structure on
1480 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1482 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1483 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1484 defined in <sys/procfs.h>, has been corrected to match the type actually
1485 used by the Linux kernel. This affects the size and layout of those
1488 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1489 meant to scan a string and allocate space for it with malloc, is now
1490 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1491 defined. This extension conflicts with C99's use of '%a' to scan a
1492 hexadecimal floating-point number, which is now available to programs
1493 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1495 POSIX.1-2008 includes the feature of allocating a buffer for string input
1496 with malloc, using the modifier letter 'm' instead. Programs using
1497 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1498 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1499 C99 '%a' no longer need to avoid _GNU_SOURCE.
1501 GCC's -Wformat warnings can detect most uses of this extension, as long
1502 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1503 __attribute__ ((format (scanf, ...))).
1505 Changes to build and runtime requirements:
1507 * Python 3.4 or later is required to build the GNU C Library.
1509 * On most architectures, GCC 5 or later is required to build the GNU C
1510 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1512 Older GCC versions and non-GNU compilers are still supported when
1513 compiling programs that use the GNU C Library.
1515 Security related changes:
1517 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1518 denial of service due to resource exhaustion when processing getaddrinfo
1519 calls with crafted host names. Reported by Guido Vranken.
1521 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1522 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1523 happened, accessing the 32-bit size_t value as the full 64-bit register
1524 in the assembly string/memory functions would cause a buffer overflow.
1525 Reported by H.J. Lu.
1527 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1528 addresses with arbitrary trailing characters, potentially leading to data
1529 or command injection issues in applications.
1531 The following bugs are resolved with this release:
1533 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1534 [10496] localedata: 12h time representation in multiple locales faulty
1535 [10797] localedata: it_IT locale numeric does not have a separator for
1537 [11319] libc: dprintf doesn't handle errors properly
1538 [16346] time: mktime: potentially unsafe use of localtime_offset
1539 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1541 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1542 posix_spawn_file_actions_addfchdir_np
1543 [17426] localedata: Indian locales: set the correct date format
1544 [17490] stdio: popen should not invoke atfork handlers
1545 [17783] libc: TIOCSER_TEMT conditions inconsistent
1546 [18040] regex: use-after-free in regexec/get_subexp
1547 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1548 [20018] network: getaddrinfo should reject IP addresses with trailing
1549 characters (CVE-2016-10739)
1550 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1551 [20271] libc: Missing "\n" in __libc_fatal calls
1552 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1553 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1554 pointer argument is non-NULL
1555 [21037] stdio: open_memstream and freopen
1556 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1557 [21716] time: Crash in glibc's mktime in low-memory situations
1558 [22834] stdio: Subprocess forked by popen may crash in Linux when
1559 multithreads call popen
1560 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1561 and pthread_create fails.
1562 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1563 [23125] libc: riscv64: endless loop when throwing an exception from a
1565 [23275] nptl: Race in pthread_mutex_lock while promoting to
1566 PTHREAD_MUTEX_ELISION_NP.
1567 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1569 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1571 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1573 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1574 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1576 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1577 [23521] nss: get_next_alias nss_files file stream leak
1578 [23538] nptl: Hang in pthread_cond_broadcast
1579 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1580 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1581 [23579] libc: Errors misreported in preadv2
1582 [23597] build: support/test-container.c doesn't work with different
1584 [23603] time: mktime signed integer overflow on large timestamps
1585 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1586 [23614] libc: powerpc: missing CFI register information in __mpn_*
1588 [23637] string: Generic strstr/strcasestr fails with huge needles
1589 [23640] libc: no way to easily clear FD_CLOEXEC in
1590 posix_spawn_file_actions_adddup2()
1591 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1593 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1595 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1596 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1597 bits/types/struct_rusage.h
1598 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1600 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1602 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1603 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1604 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1606 [23724] localedata: Albanian date formats are incorrect
1607 [23735] math: libnldbl_nonshared.a references internal libm symbols
1608 [23740] localedata: kl_GL: Month names and date formats need update
1609 [23744] regex: regex refactorings to remove BE, avoid duplication
1610 [23745] time: mktime fix for Gnulib + coreutils
1611 [23758] time: Improve the width of alternate representation for year in
1613 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1614 [23789] time: mktime does not set errno on failure
1615 [23791] localedata: Wrong monetary format for ca_ES locale
1616 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1617 [23794] locale: c16rtomb does not handle surrogate pairs
1618 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1619 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1620 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1621 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1622 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1623 [23862] libc: [sh] missing kernel-features.h undefines
1624 [23864] libc: [riscv] missing kernel-features.h undefines
1625 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1626 [23907] malloc: Incorrect double-free malloc tcache check disregards
1628 [23913] libc: off-by-one in function maybe_script_execute in
1629 sysdeps/posix/spawni.c
1630 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1631 [23923] locale: Add --no-hard-links option to localedef
1632 [23927] network: Linux if_nametoindex() does not close descriptor
1634 [23961] math: powf can overflow to inf without setting errno in non-
1635 nearest rounding mode
1636 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1637 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1638 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1639 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1640 [24011] localedata: Fixed small type in comment for locale bs_BA
1641 [24018] libc: gettext() may return NULL
1642 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1643 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1644 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1646 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1647 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1649 [24046] localedata: en_US locale doesn't define date_fmt
1650 [24063] manual: @var{errno} should be @code{errno}
1651 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1652 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1654 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1656 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1658 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1660 [24112] network: Do not send DNS queries for non-host names (where all
1661 answers will be rejected)
1662 [24130] libc: alpha __remqu corrupts $f3 register
1669 * The localization data for ISO 14651 is updated to match the 2016
1670 Edition 4 release of the standard, this matches data provided by
1671 Unicode 9.0.0. This update introduces significant improvements to the
1672 collation of Unicode characters. This release deviates slightly from
1673 the standard in that the collation element ordering for lowercase and
1674 uppercase LATIN script characters is adjusted to ensure that regular
1675 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1676 is not matched by [a-z]. With the update many locales have been
1677 updated to take advantage of the new collation information. The new
1678 collation information has increased the size of the compiled locale
1679 archive or binary locales.
1681 * The GNU C Library can now be compiled with support for Intel CET, AKA
1682 Intel Control-flow Enforcement Technology. When the library is built
1683 with --enable-cet, the resulting glibc is protected with indirect
1684 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1685 compatible with all existing executables and shared libraries. This
1686 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1687 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1688 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1689 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1690 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1691 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1694 * The GNU C Library now has correct support for ABSOLUTE symbols
1695 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1696 relocated incorrectly or in some cases discarded. The GNU linker can
1697 make use of the newer semantics, but it must communicate it to the
1698 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1699 field) to indicate such support is required.
1701 * Unicode 11.0.0 Support: Character encoding, character type info, and
1702 transliteration tables are all updated to Unicode 11.0.0, using
1703 generator scripts contributed by Mike FABIAN (Red Hat).
1705 * <math.h> functions that round their results to a narrower type are added
1706 from TS 18661-1:2014 and TS 18661-3:2015:
1708 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1709 fMxaddfNx functions.
1711 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1712 fMxsubfNx functions.
1714 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1715 fMxmulfNx functions.
1717 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1718 fMxdivfNx functions.
1720 * Two grammatical forms of month names are now supported for the following
1721 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1722 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1723 support two grammatical forms in abbreviated month names: Catalan, Greek,
1726 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1727 include the support for two grammatical forms of month names.
1729 * Building and running on GNU/Hurd systems now works without out-of-tree
1732 * The renameat2 function has been added, a variant of the renameat function
1733 which has a flags argument. If the flags are zero, the renameat2 function
1734 acts like renameat. If the flag is not zero and there is no kernel
1735 support for renameat2, the function will fail with an errno value of
1736 EINVAL. This is different from the existing gnulib function renameatu,
1737 which performs a plain rename operation in case of a RENAME_NOREPLACE
1738 flags and a non-existing destination (and therefore has a race condition
1739 that can clobber the destination inadvertently).
1741 * The statx function has been added, a variant of the fstatat64
1742 function with an additional flags argument. If there is no direct
1743 kernel support for statx, glibc provides basic stat support based on
1744 the fstatat64 function.
1746 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1747 library if installed. libidn2 version 2.0.5 or later is recommended. If
1748 libidn2 is not available, internationalized domain names are not encoded
1749 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1750 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1751 with an encoding error.) Flags which used to change the IDN encoding and
1752 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1753 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1754 deprecated. They no longer have any effect.
1756 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1757 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1758 range of ELF gABI expressions including such constructs as
1759 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1760 have been further restricted, and where in the past a dynamic string
1761 token sequence may have been interpreted as a literal string it will
1762 now cause a load failure. These load failures were always considered
1763 unspecified behaviour from the perspective of the dynamic loader, and
1764 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1765 results in a load failure now.
1767 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1768 implementation includes all the standard functions provided by
1771 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1772 thrd_detach, thrd_exit, and thrd_join for thread management.
1774 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1775 mtx_destroy for mutual exclusion.
1777 - call_once for function call synchronization.
1779 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1780 cnd_wait for conditional variables.
1782 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1784 Application developers must link against libpthread to use ISO C threads.
1786 Deprecated and removed features, and other changes affecting compatibility:
1788 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1789 installed. Software that was using either header should be updated to
1790 use standard <stdio.h> interfaces instead.
1792 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1793 This was never required by the C standard, and the macros just expanded
1794 to call alternative names for the same functions. If you hoped getc and
1795 putc would provide performance improvements over fgetc and fputc, instead
1796 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1797 necessary, flockfile and funlockfile.
1799 * All stdio functions now treat end-of-file as a sticky condition. If you
1800 read from a file until EOF, and then the file is enlarged by another
1801 process, you must call clearerr or another function with the same effect
1802 (e.g. fseek, rewind) before you can read the additional data. This
1803 corrects a longstanding C99 conformance bug. It is most likely to affect
1804 programs that use stdio to read interactive input from a terminal.
1807 * The macros 'major', 'minor', and 'makedev' are now only available from
1808 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1809 headers that happen to include <sys/types.h>. These macros are rarely
1810 used, not part of POSIX nor XSI, and their names frequently collide with
1811 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1812 further explanation.
1814 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1815 these macros should first include <sys/types.h>, and then include
1816 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1818 * The tilegx*-*-linux-gnu configurations are no longer supported.
1820 * The obsolete function ustat is no longer available to newly linked
1821 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1822 function has been deprecated in favor of fstatfs and statfs.
1824 * The obsolete function nfsservctl is no longer available to newly linked
1825 binaries. This function was specific to systems using the Linux kernel
1826 and could not usefully be used with the GNU C Library on systems with
1827 version 3.1 or later of the Linux kernel.
1829 * The obsolete function name llseek is no longer available to newly linked
1830 binaries. This function was specific to systems using the Linux kernel
1831 and was not declared in a header. Programs should use the lseek64 name
1832 for this function instead.
1834 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1835 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1836 previously selected by them is now always enabled.
1838 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1839 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1840 restriction (rejecting '_' in host names, among other things) has been
1841 removed, for increased compatibility with non-IDN name resolution.
1843 * The fcntl function now have a Long File Support variant named fcntl64. It
1844 is added to fix some Linux Open File Description (OFD) locks usage on non
1845 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1846 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1847 locks act as a cancellation entrypoint.
1849 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1850 ecb_crypt, and des_setparity are no longer available to newly linked
1851 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1852 longer installed. These functions encrypted and decrypted data with the
1853 DES block cipher, which is no longer considered secure. Software that
1854 still uses these functions should switch to a modern cryptography library,
1857 * Reflecting the removal of the encrypt and setkey functions above, the
1858 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1859 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1862 * The obsolete function fcrypt is no longer available to newly linked
1863 binaries. It was just another name for the standard function crypt,
1864 and it has not appeared in any header file in many years.
1866 * We have tentative plans to hand off maintenance of the passphrase-hashing
1867 library, libcrypt, to a separate development project that will, we hope,
1868 keep up better with new passphrase-hashing algorithms. We will continue
1869 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1870 'crypt_r' should not need to change at all; however, distributions will
1871 need to install <crypt.h> and libcrypt from a separate project.
1873 In this release, if the configure option --disable-crypt is used, glibc
1874 will not install <crypt.h> or libcrypt, making room for the separate
1875 project's versions of these files. The plan is to make this the default
1876 behavior in a future release.
1878 Changes to build and runtime requirements:
1880 GNU make 4.0 or later is now required to build glibc.
1882 Security related changes:
1884 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1885 been fixed by removing the glibc-internal IDNA implementation and using
1886 the system-provided libidn2 library instead. Originally reported by Hanno
1887 Böck and Christian Weisgerber.
1889 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1890 architecture could corrupt memory. Reported by Max Horn.
1892 CVE-2018-11236: Very long pathname arguments to realpath function could
1893 result in an integer overflow and buffer overflow. Reported by Alexey
1896 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1897 architecture could write beyond the target buffer, resulting in a buffer
1898 overflow. Reported by Andreas Schwab.
1900 The following bugs are resolved with this release:
1902 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1903 [6889] manual: 'PWD' mentioned but not specified
1904 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1905 when __WORDSIZE != 64
1906 [13762] regex: re_search etc. should return -2 on memory exhaustion
1907 [13888] build: /tmp usage during testing
1908 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1909 [14092] nptl: Support C11 threads
1910 [14095] localedata: Review / update collation data from Unicode / ISO
1912 [14508] libc: -Wformat warnings
1913 [14553] libc: Namespace pollution loff_t in sys/types.h
1914 [14890] libc: Make NT_PRFPREG canonical.
1915 [15105] libc: Extra PLT references with -Os
1916 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1918 [16335] manual: Feature test macro documentation incomplete and out of
1920 [16552] libc: Unify umount implementations in terms of umount2
1921 [17082] libc: htons et al.: statement-expressions prevent use on global
1922 scope with -O1 and higher
1923 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1924 [17438] localedata: pt_BR: wrong d_fmt delimiter
1925 [17662] libc: please implement binding for the new renameat2 syscall
1926 [17721] libc: __restrict defined as /* Ignore */ even in c11
1927 [17979] libc: inconsistency between uchar.h and stdint.h
1928 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1929 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1930 horrible machine code)
1931 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1933 [18471] libc: llseek should be a compat symbol
1934 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1936 [18991] nss: nss_files skips large entry in database
1937 [19239] libc: Including stdlib.h ends up with macros major and minor being
1939 [19463] libc: linknamespace failures when compiled with -Os
1940 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1941 [19527] locale: Normalized charset name not recognized by setlocale
1942 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1943 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1945 [19728] network: out of bounds stack read in libidn function
1946 idna_to_ascii_4i (CVE-2016-6261)
1947 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1948 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1949 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1951 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1952 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1953 [20419] dynamic-link: files with large allocated notes crash in
1955 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1956 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1957 [20980] manual: CFLAGS environment variable replaces vital options
1958 [21163] regex: Assertion failure in pop_fail_stack when executing a
1959 malformed regexp (CVE-2015-8985)
1960 [21234] manual: use of CFLAGS makes glibc detect no optimization
1961 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1962 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1963 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1964 [21508] locale: intl/tst-gettext failure with latest msgfmt
1965 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1966 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1967 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1969 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1971 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1972 [22247] network: Integer overflow in the decode_digit function in
1973 puny_decode.c in libidn (CVE-2017-14062)
1974 [22342] nscd: NSCD not properly caching netgroup
1975 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1976 [22550] localedata: es_ES locale (and other es_* locales): collation
1977 should treat ñ as a primary different character, sync the collation
1978 for Spanish with CLDR
1979 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1980 by gcc configured with --enable-default-pie
1981 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1982 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1983 crossing 2GB threshold (CVE-2017-18269)
1984 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1986 [22735] time: Misleading typo in time.h source comment regarding
1988 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1989 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1990 `__assert_perror_fail ()' to `__assert_fail_base ()'
1991 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1993 [22786] libc: Stack buffer overflow in realpath() if input size is close
1994 to SSIZE_MAX (CVE-2018-11236)
1995 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1996 through an absolute DT_NEEDED path
1997 [22792] build: tcb-offsets.h dependency dropped
1998 [22797] libc: pkey_get() uses non-reserved name of argument
1999 [22807] libc: PTRACE_* constants missing for powerpc
2000 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2001 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2002 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2003 [22848] localedata: ca_ES: update date definitions from CLDR
2004 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2005 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2006 [22896] localedata: Update locale data for an_ES
2007 [22902] math: float128 test failures with GCC 8
2008 [22918] libc: multiple common of `__nss_shadow_database'
2009 [22919] libc: sparc32: backtrace yields infinite backtrace with
2011 [22926] libc: FTBFS on powerpcspe
2012 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2014 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2015 [22947] libc: FAIL: misc/tst-preadvwritev2
2016 [22963] localedata: cs_CZ: Add alternative month names
2017 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2018 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2019 [22998] dynamic-link: execstack tests are disabled when SELinux is
2021 [23005] network: Crash in __res_context_send after memory allocation
2023 [23007] math: strtod cannot handle -nan
2024 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2025 [23036] regex: regex equivalence class regression
2026 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2027 [23069] libc: sigaction broken on riscv64-linux-gnu
2028 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2029 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2030 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2031 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2032 and libc build with -Os)
2033 [23140] localedata: More languages need two forms of month names
2034 [23145] libc: _init/_fini aren't marked as hidden
2035 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2036 [23171] math: C++ iseqsig for long double converts arguments to double
2037 [23178] nscd: sudo will fail when it is run in concurrent with commands
2038 that changes /etc/passwd
2039 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2041 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2042 [23208] localedata: New locale - Lower Sorbian (dsb)
2043 [23233] regex: Memory leak in build_charclass_op function in file
2045 [23236] stdio: Harden function pointers in _IO_str_fields
2046 [23250] nptl: Offset of __private_ss differs from GCC
2047 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2048 -mtune=generic -mfpmath=sse
2049 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2051 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2052 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2054 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2055 [23277] math: nan function should not have const attribute
2056 [23279] math: scanf and strtod wrong for some hex floating-point
2057 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2059 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2060 [23303] build: undefined reference to symbol
2061 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2062 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2064 [23313] stdio: libio vtables validation and standard file object
2066 [23329] libc: The __libc_freeres infrastructure is not properly run across
2068 [23349] libc: Various glibc headers no longer compatible with
2070 [23351] malloc: Remove unused code related to heap dumps and malloc
2072 [23363] stdio: stdio-common/tst-printf.c has non-free license
2073 [23396] regex: Regex equivalence regression in single-byte locales
2074 [23422] localedata: oc_FR: More updates of locale data
2075 [23442] build: New warning with GCC 8
2076 [23448] libc: Out of bounds access in IBM-1390 converter
2077 [23456] libc: Wrong index_cpu_LZCNT
2078 [23458] build: tst-get-cpu-features-static isn't added to tests
2079 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2081 [23467] dynamic-link: x86/CET: A property note parser bug
2088 * The GNU C Library can now be compiled with support for building static
2089 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2090 executables are like static executables but can be loaded at any address
2091 and provide additional security hardening benefits at the cost of some
2092 memory and performance. When the library is built with --enable-static-pie
2093 the resulting libc.a is usable with GCC 8 and above to create static PIE
2094 executables using the GCC option '-static-pie'. This feature is currently
2095 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2096 aarch64 with binutils 2.30 or later.
2098 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2099 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2102 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2104 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2106 * In order to support faster and safer process termination the malloc API
2107 family of functions will no longer print a failure address and stack
2108 backtrace after detecting heap corruption. The goal is to minimize the
2109 amount of work done after corruption is detected and to avoid potential
2110 security issues in continued process execution. Reducing shutdown time
2111 leads to lower overall process restart latency, so there is benefit both
2112 from a security and performance perspective.
2114 * The abort function terminates the process immediately, without flushing
2115 stdio streams. Previous glibc versions used to flush streams, resulting
2116 in deadlocks and further data corruption. This change also affects
2117 process aborts as the result of assertion failures.
2119 * On platforms where long double has the IEEE binary128 format (aarch64,
2120 alpha, mips64, riscv, s390 and sparc), the math library now implements
2121 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2122 These are the same interfaces added in version 2.26 for some platforms where
2123 this format is supported but is not the format of long double.
2125 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2126 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2127 implements interfaces for that type, as defined by ISO/IEC TS
2128 18661-3:2015. These are corresponding interfaces to those supported for
2131 * The math library now implements interfaces for the _Float32, _Float64 and
2132 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2133 corresponding interfaces to those supported for _Float128.
2135 * glibc now implements the memfd_create and mlock2 functions on Linux.
2137 * Support for memory protection keys was added. The <sys/mman.h> header now
2138 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2141 * The copy_file_range function was added.
2143 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2145 * The ldconfig utility now processes `include' directives using the C/POSIX
2146 collation ordering. Previous glibc versions used locale-specific
2147 ordering, the change might break systems that relied on that.
2149 * Support for two grammatical forms of month names has been added.
2150 In a call to strftime, the "%B" and "%b" format specifiers will now
2151 produce the grammatical form required when the month is used as part
2152 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2153 required when the month is named by itself. For instance, in Greek
2154 and in many Slavic and Baltic languages, "%B" will produce the month
2155 in genitive case, and "%OB" will produce the month in nominative case.
2157 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2158 are all valid and will all accept any known form of month
2159 name---standalone or complete, abbreviated or full. In a call to
2160 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2161 the strings used by "%B" and "%b", respectively. New query
2162 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2163 used by "%OB" and "%Ob", respectively.
2165 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2166 define the strings for %OB and %Ob, respectively; these have the
2167 same syntax as "mon" and "abmon". These arrays are optional; if they
2168 are not provided then they have the same content as "mon" and "abmon",
2171 These features are provided for locales which define "alt_mon" and/or
2172 "ab_alt_mon" in their locale source data. This release includes such
2173 alternative month name data for the following languages: Belarusian,
2174 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2176 This feature is currently a GNU extension, but it is expected to
2177 be added to the next revision of POSIX, and it is also already
2178 available on some BSD-derived operating systems.
2180 This feature will cause existing statically compiled applications
2181 to fail to load locales and fall back to the builtin C/POSIX locales.
2182 See notes below for other changes affecting compatibility.
2184 * Support for the RISC-V ISA running on Linux has been added. This port
2185 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2186 for the following ISA and ABI pairs:
2192 Deprecated and removed features, and other changes affecting compatibility:
2194 * Statically compiled applications attempting to load locales compiled for the
2195 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2196 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2197 support for two grammatical forms of the month names, also extends the locale
2198 data binary format. Static applications needing locale support must be
2199 recompiled to match the runtime and data they are deployed with. In some
2200 distributions there is an upgrade window where dynamically linked applications
2201 may use a new library but the old locale data and also fall back to the
2202 builtin C/POSIX locales; restarting the application process is sufficient to
2205 * Support for statically linked applications which call dlopen is deprecated
2206 and will be removed in a future version of glibc. Applications which call
2207 dlopen need to be linked dynamically instead.
2209 * Support for old programs which use internal stdio data structures and
2210 functions is deprecated. This includes programs which use the C++ streams
2211 provided by libstdc++ in GCC 2.95. Programs which use the internal
2212 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2213 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2214 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2215 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2216 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2217 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2218 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2219 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2220 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2221 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2222 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2223 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2224 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2225 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2226 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2227 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2228 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2229 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2230 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2231 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2232 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2233 future version of glibc. Unlike other symbol removals, these old
2234 applications will not be supported using compatibility symbols.
2236 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2237 defined by <sys/ptrace.h>.
2239 * libm no longer supports SVID error handling (calling a user-provided
2240 matherr function on error) or the _LIB_VERSION variable to control error
2241 handling. (SVID error handling and the _LIB_VERSION variable still work
2242 for binaries linked against older versions of the GNU C Library.) The
2243 libieee.a library is no longer provided. math.h no longer defines struct
2244 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2245 TLOSS, PLOSS and HUGE.
2247 * The libm functions pow10, pow10f and pow10l are no longer supported for
2248 new programs. Programs should use the standard names exp10, exp10f and
2249 exp10l for these functions instead.
2251 * The mcontext_t type is no longer the same as struct sigcontext. On
2252 platforms where it was previously the same, this changes the C++ name
2253 mangling for interfaces involving this type.
2255 * The add-ons mechanism for building additional packages at the same time as
2256 glibc has been removed. The --enable-add-ons configure option is now
2259 * The --without-fp configure option is now ignored. Whether hardware
2260 floating-point instructions are used is now configured based on whether
2261 the compiler used at configure time (without any options implied by a
2262 --with-cpu= configure option) uses such instructions.
2264 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2265 the specified string can be parsed as a domain name.
2267 * In the malloc_info output, the <heap> element may contain another <aspace>
2268 element, "subheaps", which contains the number of sub-heaps.
2270 * The libresolv function p_secstodate is no longer supported for new
2273 * The tilepro-*-linux-gnu configuration is no longer supported.
2275 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2276 and will be removed in a future release. Software that is still using
2277 either header should be updated to use standard <stdio.h> interfaces
2280 libio.h was originally the header for a set of supported GNU extensions,
2281 but they have not been maintained as such in many years, they are now
2282 standing in the way of improvements to stdio, and we don't think there are
2283 any remaining external users. _G_config.h was never intended for public
2284 use, but predates the bits convention.
2286 Changes to build and runtime requirements:
2288 * bison version 2.7 or later is required to generate code in the 'intl'
2291 Security related changes:
2293 CVE-2009-5064: The ldd script would sometimes run the program under
2294 examination directly, without preventing code execution through the
2295 dynamic linker. (The glibc project disputes that this is a security
2296 vulnerability; only trusted binaries must be examined using the ldd
2299 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2300 suffered from a one-byte overflow during ~ operator processing (either
2301 on the stack or the heap, depending on the length of the user name).
2302 Reported by Tim Rühsen.
2304 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2305 would sometimes fail to free memory allocated during ~ operator
2306 processing, leading to a memory leak and, potentially, to a denial
2309 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2310 without GLOB_NOESCAPE, could write past the end of a buffer while
2311 unescaping user names. Reported by Tim Rühsen.
2313 CVE-2017-17426: The malloc function, when called with an object size near
2314 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2315 instead of NULL. This was a regression introduced with the new malloc
2316 thread cache in glibc 2.26. Reported by Iain Buclaw.
2318 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2319 to the allocation of too much memory. (This is not a security bug per se,
2320 it is mentioned here only because of the CVE assignment.) Reported by
2323 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2324 of the number of search path components. (This is not a security
2325 vulnerability per se because no trust boundary is crossed if the fix for
2326 CVE-2017-1000366 has been applied, but it is mentioned here only because
2327 of the CVE assignment.) Reported by Qualys.
2329 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2330 for AT_SECURE or SUID binaries could be used to load libraries from the
2333 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2334 succeeds without returning an absolute path due to unexpected behaviour
2335 of the Linux kernel getcwd syscall. Reported by halfdog.
2337 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2338 an object size near the value of SIZE_MAX, would return a pointer to a
2339 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2341 CVE-2018-6551: The malloc function, when called with an object size near
2342 the value of SIZE_MAX, would return a pointer to a buffer which is too
2343 small, instead of NULL.
2345 The following bugs are resolved with this release:
2347 [866] glob: glob should match dangling symlinks
2348 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2349 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2351 [5997] math: Very slow execution of sinf function
2352 [10580] localedata: hr_HR: updated locale
2353 [10871] locale: 'mon' array should contain both nominative and genitive
2355 [12349] localedata: eu_ES: incorrect thousands separator
2356 [13605] localedata: shn_MM: new Shan locale
2357 [13805] localedata: ru_RU: currency should use ',' as radix point
2358 [13953] localedata: km_KH: locale update
2359 [13994] localedata: mjw_IN: new locale
2360 [14121] build: make writes .mo files in po directory
2361 [14333] libc: Fix the race between atexit() and exit()
2362 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2363 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2365 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2366 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2367 width Latin characters
2368 [15332] localedata: es_CU: locale update
2369 [15436] stdio: Don't close or flush stdio streams on abort
2370 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2372 [16148] localedata: ca_ES: incorrect thousands separator
2373 [16750] dynamic-link: ldd should not try to execute the binaries
2375 [16777] localedata: pl_PL: incorrect thousands separator in locale
2376 [16905] localedata: hanzi: new collation
2377 [17563] localedata: cmn_TW: add hanzi collation
2378 [17750] localedata: wrong collation order of diacritics in most locales
2379 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2381 [17956] build: Build fails on missing definitions from header file
2382 nss/nss.h when Mozilla NSS is used for cryptography
2383 [18203] libc: realpath() does not handle unreachable paths correctly
2384 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2385 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2386 [18822] libc: Internal functions are called via PLT
2387 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2388 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2389 [19574] libc: glibc should support building static PIE binaries
2390 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2392 [19971] glob: glob: Do not skip entries with zero d_ino values
2393 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2394 [20008] localedata: km_KH: convert to translit_neutral
2395 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2396 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2397 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2398 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2399 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2401 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2402 they're set, wrong errors returned by gaih_inet when lookup functions
2404 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2405 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2407 [20952] localedata: yuw_PG: new locale
2408 [21084] localedata: charmaps/IBM858: new codepage
2409 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2410 [21242] libc: assert gives pedantic warning in old gcc versions
2411 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2412 __regcall calling convention
2413 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2414 [21326] libc: C99 functions are not declared for C++11 and later if
2415 _GNU_SOURCE is not predefined by g++
2416 [21457] libc: sys/ucontext.h namespace
2417 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2418 [21660] math: GCC fails to compile a formula with tgmath.h
2419 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2420 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2421 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2422 [21684] math: tgmath.h handling of complex integers
2423 [21685] math: tgmath.h handling of bit-fields
2424 [21686] math: tgmath.h handling of __int128
2425 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2427 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2429 [21750] localedata: column width of characters incompatible with classical
2431 [21754] malloc: malloc: Perform as little work as possible after heap
2432 consistency check failures
2433 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2434 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2435 [21791] string: Unused XXX_chk_XXX functions in libc.a
2436 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2438 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2440 [21845] localedata: Added new Locale bho_NP
2441 [21853] localedata: Fix abday Which looks same as day in zh_SG
2442 [21854] localedata: Added New Locale en_SC
2443 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2444 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2445 _dl_runtime_resolve_avx_slow
2446 [21885] network: getaddrinfo: gethosts does not release resolver context
2447 on memory allocation failure
2448 [21899] libc: XPG4.2 sigaction namespace
2449 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2451 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2453 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2454 errno value, causing getaddrinfo to fail
2455 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2456 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2457 instead of EAI_NODATA
2458 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2459 constant PTRACE_SEIZE_DEVEL
2460 [21930] math: C-only gcc builtins used in <math.h> isinf
2461 [21932] network: Unpaired __resolv_context_get in generic get*_r
2463 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2464 [21944] libc: sigval namespace
2465 [21951] localedata: Update hanzi collation by stroke
2466 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2467 sysdeps/x86_64/fpu/e_expf.S
2468 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2469 allocation in syscall loops)
2470 [21959] localedata: Fix Country name for xh_ZA
2471 [21960] localedata: Fix abmon for bem_ZM
2472 [21966] math: AVX2 mathvec functions use FMA without checking
2473 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2474 [21971] localedata: Added New Locale for mfe_MU
2475 [21972] libc: assert macro requires operator== (int) for its argument type
2476 [21973] math: [sparc] libm missing sqrtl compat symbol
2477 [21974] libc: Remove __bb_init_func and __bb_exit_func
2478 [21982] string: stratcliff.c: error: assuming signed overflow does not
2480 [21986] stdio: __guess_grouping is called incorrectly
2481 [21987] math: [sparc32] wrong bits/long-double.h installed
2482 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2484 [22022] localedata: Missing country_name for mni_IN
2485 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2487 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2489 [22026] locale: iconv_open: heap overflow on gconv_init failure
2490 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2491 [22035] math: [m68k] bits/math-inline.h macro namespace
2492 [22038] localedata: Fix abbreviated weeks and months for Somali
2493 [22044] localedata: Remove redundant data for Limburgish Language
2494 [22050] malloc: Linking with -lmcheck does not hook
2495 __malloc_initialize_hook correctly
2496 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2497 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2498 [22070] localedata: charmaps/UTF-8: wcwidth for
2499 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2500 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2501 Jungseong and Jongseong) should be 0
2502 [22078] nss: nss_files performance issue in multi mode
2503 [22082] math: bits/math-finite.h exp10 condition
2504 [22086] libc: pcprofiledump incorrect cross-endian condition
2505 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2506 [22095] network: Name server address allocation memory leak in resolv.conf
2508 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2510 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2511 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2513 [22111] malloc: malloc: per thread cache is not returned when thread exits
2514 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2515 [22134] libc: [linux] implement fexecve with execveat
2516 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2518 [22145] libc: ttyname() gives up too early in the face of namespaces
2519 [22146] math: C++ build issue with float128 on x86_64
2520 [22153] nptl: nptl: save error code before process termination
2521 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2522 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2523 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2524 [22165] libc: [hppa] Text relocations in libc.so
2525 [22180] libc: destructor registered via __cxa_atexit is called twice
2526 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2527 symlinks") cause "make" segfaults
2528 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2530 [22207] libc: FAIL: stdlib/test-atexit-race
2531 [22225] math: nearbyint arithmetic moved before feholdexcept
2532 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2533 [22235] math: iscanonical in C++ and float128
2534 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2535 the svid compat wrapper
2536 [22244] math: ynf and yn are wrong without the svid compat wrapper
2537 [22273] libc: Improper assert in Linux posix_spawn implementation
2538 [22284] libc: -pg -pie doesn't work
2539 [22292] locale: localedef exits with error 4 when it should be error 1
2540 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2541 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2543 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2544 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2546 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2547 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2548 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2549 [22322] libc: [mips64] wrong bits/long-double.h installed
2550 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2551 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2553 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2554 [22343] malloc: Integer overflow in posix_memalign
2555 [22347] libc: getrandom() returns the number of bytes that were copied to
2556 the buffer even though the comments say "Return 0 on success and -1 on
2558 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2559 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2561 [22370] dynamic-link: Incorrect note padding check
2562 [22375] libc: malloc returns pointer from tcache_get when should return
2563 NULL (CVE-2017-17426)
2564 [22377] math: iseqsig, float128 and C++
2565 [22382] localedata: Error in tpi_PG locale
2566 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2567 inside the ASCII printable range
2568 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2570 [22403] localedata: Slash needs escaping in some locales
2571 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2572 [22409] network: res_hnok does not accept some host names used on the
2574 [22412] network: res_dnok, res_hnok should perform syntax checks
2575 [22413] network: ns_name_pton ignores syntactically invalid trailing
2577 [22415] stdio: setvbuf can lead to invalid free/segfault
2578 [22432] build: Non-deterministic build
2579 [22439] malloc: malloc_info should compute summary statistics for all sub-
2581 [22442] network: if_nametoindex could report index for the wrong
2582 networking interface
2583 [22446] build: aliasing violation calling readlink in handle_request
2584 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2585 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2586 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2587 __nscd_hash/__nss_hash
2588 [22463] network: p_secstodate overflow handling
2589 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2590 [22478] libc: sigwait can fail with EINTR
2591 [22505] libc: ldconfig processes include directive in locale-specific
2593 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2594 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2595 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2596 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2597 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2598 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2599 same as for Croatian
2600 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2601 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2602 [22577] libc: missing newline after "cannot allocate TLS data structures
2604 [22588] manual: manual/conf.texi: missing underscore in front of
2606 [22593] math: nextafter and nexttoward are declared with const attribute
2607 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2608 [22603] string: ia64 memchr overflows internal pointer check
2609 [22605] libc: SH clone does not set the exit code correctly
2610 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2612 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2613 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2614 modified in case of success
2615 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2616 [22615] manual: manual: ambiguous wording about errno value in case of
2618 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2620 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2621 binaries or if /proc is not mounted (CVE-2017-16997)
2622 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2623 [22630] build: $(no-pie-ldflag) is no longer effective
2624 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2625 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2626 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2627 [22637] nptl: guard size is subtracted from thread stack size instead of
2629 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2630 [22657] localedata: hu_HU: Avoid double space in date
2631 [22660] math: fmax, fmin sNaN handling on alpha
2632 [22664] libc: New warning of GCC8
2633 [22665] math: alpha: ceil and floor raise inexact exceptions
2634 [22666] math: alpha: trunc raise inexact exceptions
2635 [22667] libc: makecontext lacks stack alignment on i386
2636 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2637 [22679] libc: getcwd(3) can succeed without returning an absolute path
2639 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2640 elision and tunables
2641 [22687] math: [powerpc-nofpu] complex long double functions spurious
2643 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2644 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2645 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2647 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2648 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2650 [22701] nis: Incomplete removal of libnsl
2651 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2652 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2653 [22715] dynamic-link: FAIL: elf/tst-audit10
2654 [22719] libc: Backtrace tests fail on hppa
2655 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2656 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2657 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2658 before the first call to crypt_r () in crypt/badsalttest.c
2665 * A per-thread cache has been added to malloc. Access to the cache requires
2666 no locks and therefore significantly accelerates the fast path to allocate
2667 and free small amounts of memory. Refilling an empty cache requires locking
2668 the underlying arena. Performance measurements show significant gains in a
2669 wide variety of user workloads. Workloads were captured using a special
2670 instrumented malloc and analyzed with a malloc simulator. Contributed by
2671 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2673 * Unicode 10.0.0 Support: Character encoding, character type info, and
2674 transliteration tables are all updated to Unicode 10.0.0, using
2675 generator scripts contributed by Mike FABIAN (Red Hat).
2676 These updates cause user visible changes, especially the changes in
2677 wcwidth for many emoji characters cause problems when emoji sequences
2678 are rendered with pango, see for example:
2679 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2681 * Collation of Hungarian has been overhauled and is now consistent with "The
2682 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2685 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2687 - The GNU C Library will now detect when /etc/resolv.conf has been
2688 modified and reload the changed configuration. The new resolver option
2689 “no-reload” (RES_NORELOAD) disables this behavior.
2691 - The GNU C Library now supports an arbitrary number of search domains
2692 (configured using the “search” directive in /etc/resolv.conf);
2693 previously, there was a hard limit of six domains. For backward
2694 compatibility, applications that directly modify the ‘_res’ global
2695 object are still limited to six search domains.
2697 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2698 Library will now randomly pick a name server from the configuration as a
2699 starting point. (Previously, the second name server was always used.)
2701 * The tunables feature is now enabled by default. This allows users to tweak
2702 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2704 * New function reallocarray, which resizes an allocated block (like realloc)
2705 to the product of two sizes, with a guaranteed clean failure upon integer
2706 overflow in the multiplication. Originally from OpenBSD, contributed by
2707 Dennis Wölfing and Rüdiger Sonderfeld.
2709 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2710 These are extended versions of preadv and pwritev, respectively, taking an
2711 additional flags argument. The set of supported flags depends on the
2712 running kernel; full support currently requires kernel 4.7 or later.
2714 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2715 create a new session ID for the spawned process. This feature is
2716 scheduled to be added to the next major revision of POSIX; for the time
2717 being, it is available under _GNU_SOURCE.
2719 * errno.h is now safe to use from C-preprocessed assembly language on all
2720 supported operating systems. In this context, it will only define the
2721 Exxxx constants, as preprocessor macros expanding to integer literals.
2723 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2724 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2725 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2726 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2728 To compile programs that use this feature, the compiler must support
2729 128-bit floating point with the type name _Float128 (as defined by TS
2730 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2731 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2732 must be defined to make the new interfaces visible.
2734 The new functions and macros correspond to those present for other
2735 floating-point types (except for a few obsolescent interfaces not
2736 supported for the new type), with F128 or f128 suffixes; for example,
2737 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2738 printf or scanf formats for the new type; the strfromf128 and strtof128
2739 interfaces should be used instead.
2741 Deprecated and removed features, and other changes affecting compatibility:
2743 * The synchronization that pthread_spin_unlock performs has been changed to
2744 now be equivalent to a C11 atomic store with release memory order to the
2745 spin lock's memory location. Previously, several (but not all)
2746 architectures used stronger synchronization (e.g., containing what is
2747 often called a full barrier). This change can improve performance, but
2748 may affect odd fringe uses of spin locks that depend on the previous
2749 behavior (e.g., using spin locks as atomic variables to try to implement
2750 Dekker's mutual exclusion algorithm).
2752 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2755 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2756 will only be built and installed when the GNU C Library is configured with
2757 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2758 as TIRPC or rpcsvc-proto, to be used.
2760 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2761 libnss_compat, are deprecated, and will not be built or installed by
2764 The NIS(+) support library, libnsl, is also deprecated. By default, a
2765 compatibility shared library will be built and installed, but not headers
2766 or development libraries. Only a few NIS-related programs require this
2767 library. (In particular, the GNU C Library has never required programs
2768 that use 'gethostbyname' to be linked with libnsl.)
2770 Replacement implementations based on TIRPC, which additionally support
2771 IPv6, are available from <https://github.com/thkukuk/>. The configure
2772 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2773 name service modules, to be built and installed.
2775 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2776 support is enabled, the configured recursive resolver must support EDNS.
2777 (Responding to EDNS-enabled queries with responses which are not
2778 EDNS-enabled is fine, but FORMERR responses are not.)
2780 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2781 servers have not supported this opcode for a long time.
2783 * The _res_opcodes variable has been removed from libresolv. It had been
2784 exported by accident.
2786 * <string.h> no longer includes inline versions of any string functions,
2787 as this kind of optimization is better done by the compiler. The macros
2788 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2790 * The nonstandard header <xlocale.h> has been removed. Most programs should
2791 use <locale.h> instead. If you have a specific need for the definition of
2792 locale_t with no other declarations, please contact
2793 libc-alpha@sourceware.org and explain.
2795 * The obsolete header <sys/ultrasound.h> has been removed.
2797 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2799 * The obsolete function cfree has been removed. Applications should use
2802 * The stack_t type no longer has the name struct sigaltstack. This changes
2803 the C++ name mangling for interfaces involving this type.
2805 * The ucontext_t type no longer has the name struct ucontext. This changes
2806 the C++ name mangling for interfaces involving this type.
2808 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2809 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2810 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2811 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2812 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2813 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2814 fpregset_t type no longer has the name struct fpu. This changes the C++
2815 name mangling for interfaces involving those types.
2817 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2818 synced with the kernel:
2820 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2821 are not supported on this architecture and have been removed.
2823 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2824 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2825 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2827 Programs that assume the GET/SETREGS ptrace requests are universally
2828 available will now fail to build, instead of malfunctioning at runtime.
2830 Changes to build and runtime requirements:
2832 * Linux kernel 3.2 or later is required at runtime, on all architectures
2833 supported by that kernel. (This is a change from version 2.25 only for
2836 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2838 * On most architectures, GCC 4.9 or later is required to build the GNU C
2839 Library. On powerpc64le, GCC 6.2 or later is required.
2841 Older GCC versions and non-GNU compilers are still supported when
2842 compiling programs that use the GNU C Library. (We do not know exactly
2843 how old, and some GNU extensions to C may be _de facto_ required. If you
2844 are interested in helping us make this statement less vague, please
2845 contact libc-alpha@sourceware.org.)
2847 Security related changes:
2849 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2850 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2852 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2853 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2855 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2856 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2859 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2860 fixed (CVE-2017-12133).
2862 The following bugs are resolved with this release:
2864 [984] network: Respond to changed resolv.conf in gethostbyname
2865 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2866 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2868 [12189] libc: __stack_chk_fail should not attempt a backtrace
2870 [14096] time: Race condition on timezone/tst-timezone.out
2871 [14172] localedata: az_IR: new locale
2872 [14995] build: glibc fails to build if gold is the default linker, even if
2874 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2875 [16637] network: inet_pton function is accepting IPv6 with bad format
2876 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2877 x86 and other generic code
2878 [16875] localedata: ko_KR: fix lang_name
2879 [17225] localedata: ar_SY: localized month names for May and June are
2881 [17297] localedata: da_DK: wrong date_fmt string
2882 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2883 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2884 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2885 [19066] localedata: ar_SA abbreviated day and month names are in English
2886 [19569] network: resolv: Support an arbitrary number of search domains
2887 [19570] network: Implement random DNS server selection in the stub
2889 [19838] locale: localedef fails on PA-RISC
2890 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2891 order of 0D36 and 0D37
2892 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2894 [20098] libc: FAIL: debug/backtrace-tst on hppa
2895 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2897 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2899 [20313] localedata: Update locale data to Unicode 9.0
2900 [20424] manual: Document how to provide a malloc replacement
2901 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2903 [20686] locale: Add el_GR@euro to SUPPORTED.
2904 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2905 failures consistently
2906 [21015] dynamic-link: Document and fix --enable-bind-now
2907 [21016] nptl: pthread_cond support is broken on hppa
2908 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2909 frame-pointer on i386
2910 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2912 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2913 [21088] libc: Build fails with --enable-static-nss
2914 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2915 generic c code is used
2916 [21109] libc: Tunables broken on big-endian
2917 [21112] math: powf has large ulp errors with base close to 1 and exponent
2919 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2921 [21120] malloc: glibc malloc is incompatible with GCC 7
2922 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2924 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2925 (-0.0) when linking with -lieee
2926 [21171] math: log10, log2 and lgamma return incorrect results
2927 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2928 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2929 [21207] localedata: ce_RU: update weekdays from CLDR
2930 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2931 [21217] localedata: Update months from CLDR-31
2932 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2933 [21243] libc: support_delete_temp_file should issue warning for failed
2935 [21244] libc: support resolv_test_start() socket fd close should be
2937 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2938 new posix_spawn implementation
2939 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2940 leads to lower CPU frequency
2941 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2942 [21261] libc: [sparc64] bits/setjmp.h namespace
2943 [21267] network: [mips] bits/socket.h IOC* namespace
2944 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2945 [21270] libc: mmap64 silently truncates large offset values
2946 [21275] libc: posix_spawn always crashes on ia64 now
2947 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2948 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2949 [21289] libc: Incorrect declaration for 32-bit platforms with
2950 _FILE_OFFSET_BITS=64 causes build error
2951 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2952 not support gethostbyname4_r
2953 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2955 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2957 [21340] libc: Support POSIX_SPAWN_SETSID
2958 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2959 [21359] network: ns_name_pack needs additional byte in destination buffer
2960 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2961 against fragmentation attacks (CVE-2017-12132)
2962 [21369] network: resolv: Remove EDNS fallback
2963 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2965 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2966 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2967 [21393] stdio: Missing dup3 error check in freopen, freopen64
2968 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2969 [21399] localedata: Bad description for U00EC in
2970 localedata/charmaps/CP1254
2971 [21411] malloc: realloc documentation error
2972 [21426] network: sys/socket.h uio.h namespace
2973 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2974 [21445] libc: signal.h bsd_signal namespace
2975 [21455] network: Network headers stdint.h namespace
2976 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2978 [21475] network: resolv: Overlong search path is truncated mid-label
2979 [21511] libc: sigstack namespace
2980 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2981 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2982 bits/syscall.h: No such file or directory
2983 [21517] libc: struct sigaltstack namespace
2984 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2985 [21533] localedata: Update locale data to Unicode 10.0
2987 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2988 junk at end of line, first unrecognized character is `@'
2989 [21538] libc: SIG_HOLD missing for XPG4
2990 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2991 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2992 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2993 [21543] libc: sigevent namespace
2994 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2995 size for general purpose registers in mcontext_t structure
2996 [21550] libc: sigwait namespace
2997 [21552] libc: XPG4 bsd_signal namespace
2998 [21554] libc: sigpause namespace
2999 [21560] libc: sys/wait.h signal.h namespace
3000 [21561] libc: waitid namespace
3001 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3002 '/usr/include/stdlib.h': Permission denied
3003 [21575] libc: sys/wait.h missing struct rusage definition
3004 [21584] libc: sigaltstack etc namespace
3005 [21597] libc: siginterrupt namespace
3006 [21607] math: hppa: FAIL: math/test-tgmath
3007 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3009 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3010 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3011 stack and heap (CVE-2017-1000366)
3012 [21625] libc: wait3 namespace
3013 [21654] nss: Incorrect pointer alignment in NSS group merge result
3015 [21657] network: Parse interface zone id for node-local multicast
3016 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3018 [21666] libc: .symver is used on common symbol
3019 [21668] network: resolv: res_init cross-thread broadcast introduces race
3021 [21687] math: tgmath.h totalorder, totalordermag return type
3022 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3024 [21696] libc: Incorrect assumption of of __cpu_mask in
3025 posix/sched_cpucount.c
3026 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3027 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3029 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3030 leading to relocation crash
3031 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3032 `resolv_conf_matches (resp, conf)' failed.
3033 [21710] localedata: Added Samoan language locale for Samoa
3034 [21711] localedata: Pashto yesstr/nostr locale are missing
3035 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3036 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3037 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3038 [21723] localedata: yesstr/nostr missing for Chinese language locale
3039 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3041 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3043 [21728] localedata: New Locale for Tongan language
3044 [21729] localedata: incorrect LC_NAME fields for hi_IN
3045 [21733] localedata: yesstr and nostr are missing for zh_HK
3046 [21734] localedata: Missing yesstr and nostr are for kw_GB
3047 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3048 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3049 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3050 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3052 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3054 [21749] localedata: Wrong abbreviated day name (“abday”) for
3056 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3057 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3058 [21759] localedata: missing yesstr and nostr for Tigrinya
3059 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3060 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3061 [21767] localedata: Missing Bislama locales
3062 [21768] localedata: Missing yesstr and nostr for aa_ET
3063 [21770] localedata: Missing Field in li_NL
3064 [21778] nptl: Robust mutex may deadlock
3065 [21779] libc: MicroBlaze segfaults when loading libpthread
3066 [21783] localedata: Fix int_select international_call_prefixes
3067 [21784] localedata: Inconsistency in country_isbn
3068 [21788] localedata: Missing Country Postal Abbreviations
3069 [21794] localedata: Added-country_isbn-for-Italy
3070 [21795] localedata: Add/Fix country_isbn for France
3071 [21796] localedata: Added country_isbn for Republic of Korea
3072 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3073 [21799] localedata: Added int_select international_call_prefixes
3074 [21801] localedata: Added int_select international_call_prefixes
3075 [21804] nptl: Double semicolon in thread-shared-types.h
3076 [21807] localedata: LC_ADDRESS fix for pap_CW
3077 [21808] localedata: Fix LC_ADDRESS for pap_AW
3078 [21821] localedata: Added country_name in mai_IN
3079 [21822] localedata: Fix LC_TIME for mai_IN
3080 [21823] localedata: missing yesstr, nostr for sa_IN
3081 [21825] localedata: Fix name_mrs for mag_IN
3082 [21828] localedata: 2.26 changelog should mention user visible changes
3084 [21835] localedata: Added Maithili language locale for Nepal
3085 [21838] localedata: Removed redundant data for the_NP
3086 [21839] localedata: Fix LC_MONETARY for ta_LK
3087 [21844] localedata: Fix Latin characters and Months Sequence.
3088 [21848] localedata: Fix mai_NP Title Name
3093 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3094 24731-2:2010, is supported to enable declarations of functions from that
3095 TR. Note that not all functions from that TR are supported by the GNU C
3098 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3099 18661-1:2014, is supported to enable declarations of functions and macros
3100 from that TS. Note that not all features from that TS are supported by
3103 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3104 18661-4:2015, is supported to enable declarations of functions and macros
3105 from that TS. Note that most features from that TS are not supported by
3108 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3109 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3110 Since the GNU C Library defaults to a much newer revision of POSIX, this
3111 will only affect programs that specifically request an old conformance
3112 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3113 see a change in the visible declarations, but a program compiled with
3114 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3117 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3118 defined by all multithreaded code, but glibc has not required this for
3121 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3122 means that in a future release, the macros “major”, “minor”, and “makedev”
3123 will only be available from <sys/sysmacros.h>.
3125 These macros are not part of POSIX nor XSI, and their names frequently
3126 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3127 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3128 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3131 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3132 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3133 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3135 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3136 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3137 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3138 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3139 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3140 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3141 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3142 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3143 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3144 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3145 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3148 * New <math.h> features are added from TS 18661-1:2014:
3150 - Signaling NaN macros: SNANF, SNAN, SNANL.
3152 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3153 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3154 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3156 - llogb functions: the llogb, llogbf and llogbl functions, and the
3157 FP_LLOGB0 and FP_LLOGBNAN macros.
3159 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3162 - Comparison macros: iseqsig.
3164 - Classification macros: iscanonical, issubnormal, iszero.
3166 - Total order functions: totalorder, totalorderf, totalorderl,
3167 totalordermag, totalordermagf, totalordermagl.
3169 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3171 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3172 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3174 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3175 are added to libc. They convert a floating-point number into string.
3177 * Most of glibc can now be built with the stack smashing protector enabled.
3178 It is recommended to build glibc with --enable-stack-protector=strong.
3179 Implemented by Nick Alcock (Oracle).
3181 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3182 intended to be used instead of memset() to erase sensitive data after use;
3183 the compiler will not optimize out calls to explicit_bzero even if they
3184 are "unnecessary" (in the sense that no _correct_ program can observe the
3185 effects of the memory clear).
3187 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3188 to float instead of double. This does not affect the ABI of any libraries
3189 that are part of the GNU C Library, but may affect the ABI of other
3190 libraries that use this type in their interfaces.
3192 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3193 float_t and double_t types are now defined to long double instead of float
3194 and double. These options are not the default, and this does not affect
3195 the ABI of any libraries that are part of the GNU C Library, but it may
3196 affect the ABI of other libraries that use this type in their interfaces,
3197 if they are compiled or used with those options.
3199 * The getentropy and getrandom functions, and the <sys/random.h> header file
3202 * The buffer size for byte-oriented stdio streams is now limited to 8192
3203 bytes by default. Previously, on Linux, the default buffer size on most
3204 file systems was 4096 bytes (and thus remains unchanged), except on
3205 network file systems, where the buffer size was unpredictable and could be
3206 as large as several megabytes.
3208 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3209 for the Linux quota interface which predates kernel version 2.4.22 has
3212 * The malloc_get_state and malloc_set_state functions have been removed.
3213 Already-existing binaries that dynamically link to these functions will
3214 get a hidden implementation in which malloc_get_state is a stub. As far
3215 as we know, these functions are used only by GNU Emacs and this change
3216 will not adversely affect already-built Emacs executables. Any undumped
3217 Emacs executables, which normally exist only during an Emacs build, should
3218 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3220 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3221 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3222 “no-ip6-dotint” had already been the default, and support for the
3223 “ip6-dotint” option was removed from the Internet in 2006.
3225 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3226 flag from <resolv.h> have been removed. The option relied on a
3227 backwards-incompatible DNS extension which was never deployed on the
3230 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3231 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3232 They were already unimplemented.
3234 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3235 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3236 removed again from the IETF name lookup interface specification in RFC
3237 2553. Applications should use getaddrinfo instead.
3239 * DNSSEC-related declarations and definitions have been removed from the
3240 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3241 decode the data part of DNSSEC record types. Previous versions of glibc
3242 only implemented minimal support for the previous version of DNSSEC, which
3243 is incompatible with the currently deployed version.
3245 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3246 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3247 <arpa/nameser.h> header file because the distinction between RR types and
3248 meta-RR types is not officially standardized, subject to revision, and
3249 thus not suitable for encoding in a macro.
3251 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3252 and rhook members of the res_state type in <resolv.h> have been removed.
3253 The glibc stub resolver did not support these hooks, but the header file
3254 did not reflect that.
3256 * For multi-arch support it is recommended to use a GCC which has
3257 been built with support for GNU indirect functions. This ensures
3258 that correct debugging information is generated for functions
3259 selected by IFUNC resolvers. This support can either be enabled by
3260 configuring GCC with '--enable-gnu-indirect-function', or by
3261 enabling it by default by setting 'default_gnu_indirect_function'
3262 variable for a particular architecture in the GCC source file
3265 * GDB pretty printers have been added for mutex and condition variable
3266 structures in POSIX Threads. When installed and loaded in gdb these pretty
3267 printers show various pthread variables in human-readable form when read
3268 using the 'print' or 'display' commands in gdb.
3270 * Tunables feature added to allow tweaking of the runtime for an application
3271 program. This feature can be enabled with the '--enable-tunables' configure
3272 flag. The GNU C Library manual has details on usage and README.tunables has
3273 instructions on adding new tunables to the library.
3275 * A new version of condition variables functions have been implemented in
3276 the NPTL implementation of POSIX Threads to provide stronger ordering
3279 * A new version of pthread_rwlock functions have been implemented to use a more
3280 scalable algorithm primarily through not using a critical section anymore to
3283 Security related changes:
3285 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3286 have been created with makecontext could fail to terminate due to a
3287 missing .cantunwind annotation. This has been observed to lead to a hang
3288 (denial of service) in some Go applications compiled with gccgo. Reported
3289 by Andreas Schwab. (CVE-2016-6323)
3291 * The DNS stub resolver functions would crash due to a NULL pointer
3292 dereference when processing a query with a valid DNS question type which
3293 was used internally in the implementation. The stub resolver now uses a
3294 question type which is outside the range of valid question type values.
3297 The following bugs are resolved with this release:
3299 [4099] stdio: Overly aggressive caching by stream i/o functions.
3300 [7065] build: Support building glibc with -fstack-protector or -fstack-
3302 [9842] localedata: en_CA: incorrect date format
3303 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3304 before it started waiting
3305 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3306 [15765] nptl: sem_open is wrongly a cancellation point
3307 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3308 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3310 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3311 library linked with pthread
3312 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3313 "FIXME: Ingo" issue)
3314 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3315 [17252] libc: getrandom and getentropy syscall
3316 [17730] malloc: thread-local storage is sometimes improperly free()'d
3317 after being __libc_memalign()'d
3318 [18241] stdio: failed fseek on memstream does not set errno and can fail
3320 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3322 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3323 PTHREAD_PRIO_INHERIT mutex on ARM
3324 [18784] network: res_query and related function crash for special record
3325 type queries (CVE-2015-5180)
3326 [19380] math: strtod does not raise "inexact"
3327 [19387] string: Integer overflow in memchr
3328 [19390] string: Integer overflow in strncat
3329 [19398] build: linknamespace tests fail with massively parallel build
3330 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3332 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3333 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3334 [19514] libc: [PATCH] Fix spelling errors in spelling
3335 "implement"/"implementation" in several places
3336 [19582] network: Deprecate RES_USE_INET6
3337 [19673] manual: clog10 docs appear to be erroneous
3338 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3339 causes a segmentation fault
3340 [19826] libc: invalid pointer returned from __tls_get_addr with static
3342 [20016] network: resolv: Remove hooks support from the API
3343 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3345 [20033] math: [x86_64] vectorized math function don't call the __finite
3347 [20116] nptl: use after free in pthread_create
3348 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3349 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3351 [20311] nptl: please install proc_service.h
3352 [20366] libc: Compilation errors in installed headers in strict-compliance
3354 [20370] malloc: malloc: Arena free list management is still racy
3355 (incorrect fix in bug 19243)
3356 [20386] libc: assert (X = 0) does not result in GCC warning
3357 [20432] malloc: malloc: Minimize interface required for interposition
3358 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3359 in _Unwind_Backtrace (CVE-2016-6323)
3360 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3361 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3363 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3364 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3365 [20477] network: resolv: incorrect double-checked locking related to
3367 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3369 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3371 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3372 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3373 cause transition penalty
3374 [20517] math: sparcv9 missing fdiml compat symbol
3375 [20524] manual: strverscmp is inconsistent
3376 [20525] libc: <sys/quota.h> should be based on kernel headers
3377 [20539] math: GCC 7 -static -lm fails to link at -O3
3378 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3380 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3382 [20591] network: Remove obsolete DNSSEC support
3383 [20592] network: DNS resource record type classification macros in
3384 <arpa/nameser.h> are incorrect
3385 [20593] network: Update DNS RR type definitions
3386 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3387 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3389 [20629] network: libresolv: Remove support for bitstring labels
3391 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3392 assertion: "maxidx >= 2"
3393 [20660] math: [arm] Use VSQRT
3394 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3395 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3396 [20689] libc: Test for FMA should also check for AVX.
3397 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3398 [20715] math: iszero macro breaks existing code
3399 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3400 [20728] libc: powerpc: Missing TOC stub in clone
3401 [20729] build: glibc-2.24 fails to build for i486 with -Os
3402 [20750] build: Build fails with default PIE enabled gcc-6.x
3403 [20768] math: [alpha] sqrt fegetenv namespace
3404 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3406 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3407 __FLT_EVAL_METHOD__ is 2
3408 [20790] network: rpcgen buffer overrun in get_prog_declaration
3409 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3410 [20829] libc: crypt snprintf namespace
3411 [20847] libc: tst-vfork3 failure
3412 [20855] math: Default bits/mathdef.h has inappropriate float_t
3413 [20859] math: [sh4] FP_ILOGB0 invalid
3414 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3415 U+20AC), not same as GBK
3416 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3417 [20916] math: pow handling of sNaN arguments
3418 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3419 [20919] math: Bad pow (qNaN, 0) result with -lieee
3420 [20940] math: hypot sNaN handling
3421 [20947] math: fmax, fmin sNaN handling
3422 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3423 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3425 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3426 [20973] nptl: robust mutexes: Lost wake-ups
3427 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3428 [20978] nis: strlen on null pointer in nss_nisplus
3429 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3431 [21014] string: i686 memchr overflows internal pointer check
3432 [21019] libc: [mips] n32 lseek incorrect on overflow
3433 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3434 [21026] libc: [MIPS] readahead syscall is broken on n64
3435 [21028] math: Fallback fesetexceptflag should always succeed
3436 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3437 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3439 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3440 [21061] librt: [microblaze] librt lost clock_* exports
3441 [21073] libc: tunables: insecure environment variables passed to
3442 subprocesses with AT_SECURE
3443 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3447 * The minimum Linux kernel version that this version of the GNU C Library
3448 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3449 kernel version 2.6.32 or later suffices (on architectures that already
3450 required kernel versions more recent than 3.2, those requirements remain
3451 unchanged). Linux 3.2 or later kernel headers are required on all
3454 * The pap_AN locale has been deleted. This has been deprecated for a long
3455 time. It has been replaced by pap_AW & pap_CW, both of which have long
3456 been included in previous releases.
3458 * The readdir_r and readdir64_r functions have been deprecated. It is
3459 recommended to use readdir and readdir64 instead.
3461 * The type “union wait” has been removed. It was deprecated in the early
3462 1990s and never part of POSIX. Application code should use the int type
3463 instead of “union wait”.
3465 * A new NSS action is added to facilitate large distributed system
3466 administration. The action, MERGE, allows remote user stores like LDAP
3467 to be merged into local user stores like /etc/groups in order to provide
3468 easy to use, updated, and managed sets of merged credentials. The new
3469 action can be used by configuring it in /etc/nsswitch.conf:
3470 group: files [SUCCESS=merge] nis
3471 Implemented by Stephen Gallagher (Red Hat).
3473 * The deprecated __malloc_initialize_hook variable has been removed from the
3476 * The long unused localedef --old-style option has been removed. It hasn't
3477 done anything in over 16 years. Scripts using this option can safely
3480 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3481 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3482 return the next representable value in the direction of positive infinity
3483 and the nextdown functions return the next representable value in the
3484 direction of negative infinity. These are currently enabled as GNU
3487 Security related changes:
3489 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3490 could result in a stack overflow when getnetbyname was called with an
3491 overly long name. (CVE-2016-3075)
3493 * Previously, getaddrinfo copied large amounts of address data to the stack,
3494 even after the fix for CVE-2013-4458 has been applied, potentially
3495 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3496 instead. Reported by Michael Petlan. (CVE-2016-3706)
3498 * The glob function suffered from a stack-based buffer overflow when it was
3499 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3500 Reported by Alexander Cherepanov. (CVE-2016-1234)
3502 * The Sun RPC UDP client could exhaust all available stack space when
3503 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3504 alloca plugin for GCC. (CVE-2016-4429)
3506 * The IPv6 name server management code in libresolv could result in a memory
3507 leak for each thread which is created, performs a failing naming lookup,
3508 and exits. Over time, this could result in a denial of service due to
3509 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3511 The following bugs are resolved with this release:
3513 [1170] localedata: ne_NP: update Nepali locale definition file
3514 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3516 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3517 [6796] math: fdim() does not set errno on overflow
3518 [10354] libc: posix_spawn should use vfork() in more cases than presently
3519 [11213] localedata: localedata: add copyright disclaimer to locale files
3520 [12143] localedata: chr_US: new Cherokee locale
3521 [12450] localedata: sgs_LT: new locale
3522 [12676] localedata: ln_CD: new locale
3523 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3525 [13304] math: fma, fmaf, fmal produce wrong results
3526 [14259] build: --localedir arg to configure is ignored
3527 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3528 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3529 [14934] localedata: es_CL: wrong first weekday chilean locale
3530 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3532 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3534 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3535 [15368] nptl: raise() is not async-signal-safe
3536 [15479] math: ceil, floor, round and trunc raise inexact exception
3537 [15578] localedata: kk_KZ: various updates
3538 [16003] localedata: pap_AN: punt old locale
3539 [16137] localedata: iw_IL: punt old locale
3540 [16190] localedata: eo: new esperanto locale
3541 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3542 [16742] malloc: race condition: pthread_atfork() called before first
3543 malloc() results in unexpected locking behaviour/deadlocks
3544 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3546 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3547 [17565] localedata: pt_PT: wrong (work-)week start
3548 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3549 [17950] build: Build fails with -msse
3550 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3551 [18433] libc: posix_spawn does not return correctly upon failure to
3553 [18453] localedata: charmaps/IBM875: incorrect codes
3554 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3556 [18896] localedata: he_IL: improvements for currency
3557 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3558 Romanian locale data
3559 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3561 [19056] libc: Deprecate readdir_r
3562 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3564 [19198] localedata: nl_NL: small improvements for Dutch locales
3565 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3566 nameservers (CVE-2016-5417)
3567 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3569 [19400] locale: Language missing in "iso-639.def", trivial fix in
3571 [19431] malloc: Deadlock between fflush, getdelim, and fork
3572 [19505] libc: Incorrect file descriptor validity checks in
3573 posix_spawn_file_actions_add{open,close,dup2}
3574 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3575 when using RTLD_NEXT
3576 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3577 `intl/{gettextP,loadinfo}.h'
3578 [19534] libc: execle, execlp may use malloc
3579 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3580 [19573] network: res_nclose and __res_maybe_init disagree about name
3581 server initialization, breaking Hesiod
3582 [19575] localedata: Status of GB18030 tables
3583 [19581] localedata: sr_* date_fmt string contains additional newline
3584 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3586 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3587 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3588 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3589 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3591 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3593 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3595 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3596 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3597 [19633] locale: strfmon_l applies global locale to number formatting
3598 [19642] network: Memory leak in getnameinfo
3599 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3600 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3602 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3603 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3605 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3606 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3608 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3610 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3612 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3613 pointers and lengths in error-case.
3614 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3615 report errors on UTF-16 surrogates values.
3616 [19755] nscd: nscd assertion failure in gc
3617 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3618 [19759] libc: mempcpy shouldn't be inlined
3619 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3620 [19765] libc: s390 needs an optimized mempcpy
3621 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3622 NAME_MAX limit assumption (CVE-2016-1234)
3623 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3624 [19787] network: Missing and incorrect truncation checks in getnameinfo
3625 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3627 [19791] network: Assertion failure in res_query.c with un-connectable name
3629 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3630 [19822] math: libm.so install clobbers old version
3631 [19825] network: resolv: send_vc can return uninitialized data in second
3632 response to getaddrinfo
3633 [19830] network: nss_dns: should check RDATA length against buffer length
3634 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3635 confronted with A/AAAA records of invalid size
3636 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3637 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3638 [19853] stdio: Printing IBM long double in decimal with high precision is
3640 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3641 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3642 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3644 [19865] network: Assertion failure or memory leak in
3645 _nss_dns_getcanonname_r
3646 [19868] network: nss_dns: netent code does not skip over non-PTR records
3647 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3649 [19881] string: Improve x86-64 memset
3650 [19907] string: Incorrect memcpy tests
3651 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3653 [19925] libc: termios.h XCASE namespace
3654 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3655 [19929] libc: limits.h NL_NMAX namespace
3656 [19931] stdio: Memory leak in vfprintf
3657 [19957] libc: clone(CLONE_VM) access invalid parent memory
3658 [19963] localedata: en_IL: New locale
3659 [19989] stdio: stdio.h cuserid namespace
3660 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3662 [19996] locale: langinfo.h nl_langinfo_l namespace
3663 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3664 [20010] network: getaddrinfo: Stack overflow in hostent translation
3666 [20012] stdio: libio: fmemopen append mode failure
3667 [20014] stdio: stdio.h namespace for pre-threads POSIX
3668 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3669 [20023] libc: fcntl.h timespec namespace
3670 [20024] math: [x86_64] vectorized sincos trashes the stack
3671 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3672 [20041] time: sys/time.h timespec namespace
3673 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3674 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3675 [20051] libc: ttyslot in wrong header under wrong conditions
3676 [20054] libc: gethostname not declared for XPG4
3677 [20055] libc: termios.h missing tcgetsid for XPG4
3678 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3680 [20073] libc: sys/stat.h fchmod namespace
3681 [20074] libc: stdlib.h rand_r namespace
3682 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3683 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3685 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3686 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3688 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3689 [20119] libc: Wrong mask for processors level type from CPUID
3690 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3691 AS not supporting AVX512
3692 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3694 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3695 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3697 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3698 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3699 [20178] libc: posix_spawn{p} should not call exit
3700 [20191] stdio: libio: vtables hardening
3701 [20195] string: FMA4 detection requires CPUID execution with register
3703 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3704 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3706 [20212] math: acos (sNaN) returns sNaN
3707 [20213] math: asin (sNaN) returns sNaN
3708 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3709 [20218] math: [i386] asinhl (sNaN) returns sNaN
3710 [20219] math: [i386] atanhl (sNaN) returns sNaN
3711 [20222] stdio: fopencookie: Mangle function pointers
3712 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3713 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3714 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3716 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3717 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3718 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3719 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3720 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3721 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3722 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3723 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3724 [20240] math: modf (sNaN) returns sNaN
3725 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3726 [20250] math: frexp (sNaN) returns sNaN
3727 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3728 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3730 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3731 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3732 subscript is below array bounds [-Werror=array-bounds]
3733 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3734 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3736 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3737 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3739 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3740 "invalid" exceptions
3741 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3742 [20316] localedata: id_ID: Februari instead of Pebruari
3743 [20327] string: POWER8 strcasecmp returns incorrect result
3744 [20347] math: Failure: Test: j0_downward (0xap+0)
3745 [20348] libc: FAIL: misc/tst-preadvwritev64
3746 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3747 [20350] libc: There is no test for p{read,write}64
3748 [20357] math: Incorrect cos result for 1.5174239687223976
3749 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3753 * Unicode 8.0.0 Support: Character encoding, character type info, and
3754 transliteration tables are all updated to Unicode 8.0.0, using new
3755 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3756 These updates cause user visible changes, such as the fixes for bugs
3757 89, 16061, and 18568.
3759 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3760 kernel-internal CPU set size. This means that requests that change the
3761 CPU affinity which failed before (for example, an all-ones CPU mask) will
3762 now succeed. Applications that need to determine the effective CPU
3763 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3764 setting it because the kernel can adjust it (and the previous size check
3765 would not detect this in the majority of cases).
3767 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3768 the following new symbols are used: fts64_children, fts64_close,
3769 fts64_open, fts64_read and fts64_set.
3771 * getaddrinfo now detects certain invalid responses on an internal netlink
3772 socket. If such responses are received, an affected process will
3773 terminate with an error message of "Unexpected error <number> on netlink
3774 descriptor <number>" or "Unexpected netlink response of size <number> on
3775 descriptor <number>". The most likely cause for these errors is a
3776 multi-threaded application which erroneously closes and reuses the netlink
3777 file descriptor while it is used by getaddrinfo.
3779 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3780 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3781 unnecessary serialization of memory allocation requests across threads.
3782 The defect is now corrected. Users should see a substantial increase in
3783 the concurent throughput of allocation requests for applications which
3784 trigger this bug. Affected applications typically create and
3785 destroy threads frequently. (Bug 19048 was reported and analyzed by
3788 * There is now a --disable-timezone-tools configure option for disabling the
3789 building and installing of the timezone related utilities (zic, zdump, and
3790 tzselect). This is useful for people who build the timezone data and code
3791 independent of the GNU C Library.
3793 * The obsolete header <regexp.h> has been removed. Programs that require
3794 this header must be updated to use <regex.h> instead.
3796 * The obsolete functions bdflush, create_module, get_kernel_syms,
3797 query_module and uselib are no longer available to newly linked binaries;
3798 the header <sys/kdaemon.h> has been removed. These functions and header
3799 were specific to systems using the Linux kernel and could not usefully be
3800 used with the GNU C Library on systems with version 2.6 or later of the
3803 * Optimized string, wcsmbs and memory functions for IBM z13.
3804 Implemented by Stefan Liebler.
3806 * Newly linked programs that define a variable called signgam will no longer
3807 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3808 require signgam to be set by those functions must ensure that they use the
3809 variable provided by the GNU C Library and declared in <math.h>, without
3810 defining their own copy.
3812 * The minimum GCC version that can be used to build this version of the GNU
3813 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3814 still be used to compile programs using the GNU C Library.
3816 Security related changes:
3818 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3819 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3821 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3822 the pointer guard feature. It is always enabled. Previously,
3823 LD_POINTER_GUARD could be used to disable security hardening in binaries
3824 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3827 * An integer overflow in hcreate and hcreate_r could lead to an
3828 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3830 * The catopen function no longer has unbounded stack usage. Reported by
3831 Max. (CVE-2015-8779)
3833 * The nan, nanf and nanl functions no longer have unbounded stack usage
3834 depending on the length of the string passed as an argument to the
3835 functions. Reported by Joseph Myers. (CVE-2014-9761)
3837 * A stack-based buffer overflow was found in libresolv when invoked from
3838 libnss_dns, allowing specially crafted DNS responses to seize control
3839 of execution flow in the DNS client. The buffer overflow occurs in
3840 the functions send_dg (send datagram) and send_vc (send TCP) for the
3841 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3842 family. The use of AF_UNSPEC triggers the low-level resolver code to
3843 send out two parallel queries for A and AAAA. A mismanagement of the
3844 buffers used for those queries could result in the response of a query
3845 writing beyond the alloca allocated buffer created by
3846 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3847 the overflow. Thanks to the Google Security Team and Red Hat for
3848 reporting the security impact of this issue, and Robert Holiday of
3849 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3851 The following bugs are resolved with this release:
3853 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3854 [887] math: Math library function "logb" and "nextafter" inconsistent
3855 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3856 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3857 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3858 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3860 [4404] localedata: German translation of "Alarm clock" is misleading
3861 [6799] math: nextafter() and nexttoward() doen't set errno on
3862 overflow/underflow errors
3863 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3865 [10432] nis: _nss_nis_setnetgrent assertion failure
3866 [11460] libc: fts has no LFS support
3867 [12926] network: getaddrinfo()/make_request() may spin forever
3868 [13065] nptl: Race condition in pthread barriers
3869 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3870 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3872 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3873 [14912] libc: Rename non-installed bits/*.h headers
3874 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3875 [15367] math: Let gcc use __builtin_isinf
3876 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3877 [15421] math: lgamma wrongly sets signgam for ISO C
3878 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3879 FE_INVALID with argument out of range
3880 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3882 [15786] dynamic-link: ifunc resolver functions can smash function
3884 [15918] math: Unnecessary check for equality in hypotf()
3885 [16061] localedata: Review / update transliteration data
3886 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3888 [16141] time: strptime %z offset restriction
3889 [16171] math: drem should be alias of remainder
3890 [16296] math: fegetround is pure?
3891 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3892 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3894 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3895 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3897 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3898 "Exception "Inexact" set" on ppc32
3899 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3900 [16517] math: Missing underflow exception from tanf/tan/tanl
3901 [16519] math: Missing underflow exception from sinhf
3902 [16520] math: Missing underflow exception from tanhf
3903 [16521] math: Missing underflow exception from exp2
3904 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3906 [16734] stdio: fopen calls mmap to allocate its buffer
3907 [16961] math: nan function incorrect handling of bad sequences
3908 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3909 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3910 [16985] locale: localedef: confusing error message when opening output
3912 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3913 [17197] locale: Redundant shift character in iconv conversion output at
3915 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3916 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3917 [17250] dynamic-link: static linking breaks nss loading
3918 (getaddrinfo/getpwnam/etc...)
3919 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3921 [17441] math: isnan() should use __builtin_isnan() in GCC
3922 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3923 (related to lock elision)
3924 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3925 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3926 [17887] time: strptime should be able to parse "+01:00" style timezones
3927 [17905] libc: catopen() Multiple unbounded stack allocations
3929 [18084] libc: backtrace (..., 0) dumps core on x86
3930 [18086] libc: nice() sets errno to 0 on success
3931 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3932 is too large (CVE-2015-8778)
3933 [18251] dynamic-link: SONAME missing when audit modules provides path
3934 [18265] libc: add attributes for wchar string and memory functions
3935 [18370] math: csqrt missing underflows
3936 [18421] libc: [hppa] read-only segment has dynamic relocations
3937 [18472] libc: Obsolete syscall wrappers should be compat symbols
3938 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3939 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3940 [18525] localedata: Remove locale timezone information
3941 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3942 [18568] localedata: Update locale data to Unicode 8.0
3943 [18589] locale: sort-test.sh fails at random
3944 [18595] math: ctan, ctanh missing underflows
3945 [18604] libc: assert macro-expands its argument
3946 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3947 contains a vector instruction exception.
3948 [18611] math: j1, jn missing errno setting on underflow
3949 [18618] localedata: sync Chechen locale definitions with other *_RU
3951 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3952 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3953 [18665] network: In send_dg, the recvfrom function is NOT always using the
3954 buffer size of a newly created buffer (CVE-2015-7547)
3955 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3957 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3959 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3960 [18699] math: tilegx cproj() for various complex infinities does not yield
3962 [18724] libc: Harden put*ent functions against data injection
3963 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3964 [18755] build: build errors with -DNDEBUG
3965 [18757] stdio: fmemopen fails to set errno on failure
3966 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3968 [18781] libc: openat64 lacks O_LARGEFILE
3969 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3970 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3971 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3972 [18790] math: [ldbl-128ibm] tanhl inaccurate
3973 [18795] libc: stpncpy fortification misses buffer lengths that are
3974 statically too large
3975 [18796] build: build fails for --disable-mathvec
3976 [18803] math: hypot missing underflows
3977 [18820] stdio: fmemopen may leak memory on failure
3978 [18823] math: csqrt spurious underflows
3979 [18824] math: fma spurious underflows
3980 [18825] math: pow missing underflows
3981 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3982 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3983 [18870] build: sem_open.c fails to compile with missing symbol
3985 [18872] stdio: Fix memory leak in printf_positional
3986 [18873] libc: posix_fallocate overflow check ineffective
3987 [18875] math: Excess precision leads incorrect libm
3988 [18877] libc: arm: mmap offset regression
3989 [18887] libc: memory corruption when using getmntent on blank lines
3990 [18918] localedata: hu_HU: change time to HH:MM:SS format
3991 [18921] libc: Regression: extraneous stat() and fstat() performed by
3993 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3994 binaries (CVE-2015-8777)
3995 [18951] math: tgamma missing underflows
3996 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3998 [18953] localedata: lt_LT: change currency symbol to the euro
3999 [18956] math: powf inaccuracy
4000 [18961] math: [i386] exp missing underflows
4001 [18966] math: [i386] exp10 missing underflows
4002 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4003 [18969] build: multiple string test failures due to missing locale
4005 [18970] libc: Reference of pthread_setcancelstate in libc.a
4006 [18977] math: float / long double Bessel functions not in XSI POSIX
4007 [18980] math: i386 libm functions return with excess range and precision
4008 [18981] math: i386 scalb*, ldexp return with excess range and precision
4009 [18982] stdio: va_list and vprintf
4010 [18985] time: Passing out of range data to strftime() causes a segfault
4012 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4013 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4014 [19012] locale: iconv_open leaks memory on error path
4015 [19016] math: clog, clog10 inaccuracy
4016 [19018] nptl: Mangle function pointers in tls_dtor_list
4017 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4018 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4019 [19048] malloc: malloc: arena free list can become cyclic, increasing
4021 [19049] math: [powerpc] erfc incorrect zero sign
4022 [19050] math: [powerpc] log* incorrect zero sign
4023 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4024 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4025 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4026 [19074] network: Data race in _res_hconf_reorder_addrs
4027 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4028 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4029 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4031 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4033 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4034 [19086] manual: posix_fallocate64 documented argument order is wrong.
4035 [19088] math: lround, llround missing exceptions close to overflow
4037 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4038 [19095] math: dbl-64 lrint incorrect for 64-bit long
4039 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4040 [19124] dynamic-link: ld.so failed to build with older assmebler
4041 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4042 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4043 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4044 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4045 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4046 pthread_setaffinity_np
4047 [19156] math: [ldbl-128] j0l spurious underflows
4048 [19164] nptl: tst-getcpu fails with many possible CPUs
4049 [19168] math: math/test-ildoubl and math/test-ldouble failure
4050 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4051 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4053 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4054 (FE_NOMASK_ENV) do not clear SSE exceptions
4055 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4056 _int_new_arena/reused_arena
4057 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4058 [19201] math: dbl-64 remainder incorrect sign of zero result
4059 [19205] math: bits/math-finite.h conditions do not match math.h and
4061 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4062 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4063 for C99-based standards
4064 [19212] libc: features.h not -Wundef clean
4065 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4067 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4068 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4069 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4071 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4072 "inexact" exceptions
4073 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4075 [19242] libc: strtol incorrect in Turkish locales
4076 [19243] malloc: reused_arena can pick an arena on the free list, leading
4077 to an assertion failure and reference count corruption
4078 [19253] time: tzset() ineffective when temporary TZ did not include DST
4080 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4081 [19270] math: [hppa] Shared libm missing __isnanl
4082 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4083 MAP_HUGETLB and MAP_STACK defines
4084 [19313] nptl: Wrong __cpu_mask for x32
4085 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4086 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4087 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4088 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4089 [19363] time: x32: times() return value wrongly truncates/sign extends
4091 [19367] dynamic-link: Improve branch prediction on Silvermont
4092 [19369] network: Default domain name not reset by res_ninit when "search"
4093 / "domain" entry is removed from resolv.conf
4094 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4096 [19385] localedata: bg_BG: time separator should be colon, not comma
4097 [19408] libc: linux personality syscall wrapper may erroneously return an
4098 error on 32-bit architectures
4099 [19415] libc: dladdr returns wrong names on hppa
4100 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4101 IBM905, IBM907, and IBM909
4102 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4103 [19443] build: build failures with -DDEBUG
4104 [19451] build: Make check fails on test-double-vlen2
4105 [19462] libc: Glibc failed to build with -Os
4106 [19465] math: Wrong code with -Os
4107 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4109 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4111 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4112 [19486] math: S390: Math tests fail with "Exception Inexact set".
4113 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4114 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4116 [19590] math: Fail to build shared objects that use libmvec.so functions.
4120 * The following bugs are resolved with this release:
4122 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4123 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4124 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4125 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4126 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4127 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4128 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4129 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4130 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4131 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4132 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4133 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4134 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4135 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4136 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4137 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4138 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4139 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4140 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4141 18657, 18676, 18694, 18696, 18887.
4143 * Cache information can be queried via sysconf() function on s390 e.g. with
4144 _SC_LEVEL1_ICACHE_SIZE as argument.
4146 * A buffer overflow in gethostbyname_r and related functions performing DNS
4147 requests has been fixed. If the NSS functions were called with a
4148 misaligned buffer, the buffer length change due to pointer alignment was
4149 not taken into account. This could result in application crashes or,
4150 potentially arbitrary code execution, using crafted, but syntactically
4151 valid DNS responses. (CVE-2015-1781)
4153 * The time zone file parser has been made more robust against crafted time
4154 zone files, avoiding heap buffer overflows related to the processing of
4155 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4156 large time zone data files. Overly long time zone specifiers in the TZ
4157 variable no longer result in stack overflows and crashes.
4159 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4160 for LD and GD on x86 and x86-64, has been implemented. You will need
4161 binutils-2.24 or later to enable this optimization.
4163 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4164 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4165 Hat). These updates cause user visible changes, such as the fix for bug
4168 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4169 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4170 condition in some applications.
4172 * Added vector math library named libmvec with the following vectorized x86_64
4173 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4175 The library can be disabled with --disable-mathvec. Use of the functions is
4176 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4177 Shared library libmvec.so is linked in as needed when using -lm (no need to
4178 specify -lmvec explicitly for not static builds).
4179 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4181 * A new fmemopen implementation has been added with the goal of POSIX
4182 compliance. The new implementation fixes the following long-standing
4183 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4184 old implementation is still present for use be by existing binaries.
4186 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4187 releases. It has been fixed to match 2.19 and older, but binaries built
4188 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4190 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4191 Contributed by Roland McGrath (Google).
4193 * The header <regexp.h> is deprecated, and will be removed in a future
4194 release. Use of this header will trigger a deprecation warning.
4195 Application developers should update their code to use <regex.h> instead.
4197 This header was formerly part of SUS, but was deprecated in 1994 and
4198 removed from the standard in 2001. Also, the glibc implementation
4199 leaks memory. See BZ#18681 for more details.
4203 * The following bugs are resolved with this release:
4205 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4206 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4207 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4208 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4209 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4210 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4211 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4212 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4213 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4214 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4217 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4218 too little memory for the to-be-scanned arguments and overflow the
4219 allocated buffer. The implementation now correctly computes the required
4220 buffer size when using malloc, and switches to malloc from alloca as
4223 * A new semaphore algorithm has been implemented in generic C code for all
4224 machines. Previous custom assembly implementations of semaphore were
4225 difficult to reason about or ensure that they were safe. The new version
4226 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4227 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4228 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4230 * Port to Altera Nios II has been contributed by Mentor Graphics.
4232 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4233 implementations for powerpc64/powerpc64le.
4234 Implemented by Adhemerval Zanella (IBM).
4236 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4237 and powerpc64le. This may improve lock scaling of existing programs on
4238 HTM capable systems. The lock elision code is only enabled with
4239 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4240 powerpc will issue a transaction abort on every syscall to avoid side
4241 effects being visible outside transactions.
4243 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4244 AArch64. Contributed by ARM Ltd.
4246 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4248 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4249 under certain input conditions resulting in the execution of a shell for
4250 command substitution when the application did not request it. The
4251 implementation now checks WRDE_NOCMD immediately before executing the
4252 shell and returns the error WRDE_CMDSUB as expected.
4254 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4255 processing format strings with a large number of format specifiers.
4257 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4258 infinite loop if the DNS response contained a PTR record of an unexpected
4261 * The minimum GCC version that can be used to build this version of the GNU
4262 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4263 still be used to compile programs using the GNU C Library.
4265 * The GNU C Library is now built with -Werror by default. This can be
4266 disabled by configuring with --disable-werror.
4268 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4270 * The obsolete sigvec function has been removed. This was the original
4271 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4272 programs have been using instead for about 25 years. Of course, ABI
4273 compatibility for old binaries using sigvec remains intact.
4275 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4276 with newer versions of bison.
4278 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4279 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4280 registers overlay two consecutive single-precision registers. MIPS32R2
4281 introduced a new FPU mode (FR=1) where double-precision registers extend the
4282 corresponding single-precision registers which is incompatible with the
4283 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4284 require the use of FR=1 making a transition necessary. New o32 ABI
4285 extensions enable users to migrate over time from the original o32 ABI
4286 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4287 tracks the ABI of any loaded object and verifies that new objects are
4288 compatible. Mode transitions will also be requested as required and
4289 unsupportable objects will be rejected. The ABI checks include both soft and
4290 hard float ABIs for o32, n32 and n64.
4292 GCC 5 with GNU binutils 2.25 onwards:
4293 It is strongly recommended that all o32 system libraries are built using the
4294 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4295 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4296 compiler using --with-fp-32=xx to set this by default.
4300 * The following bugs are resolved with this release:
4302 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4303 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4304 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4305 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4306 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4307 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4308 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4309 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4310 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4311 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4312 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4313 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4314 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4315 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4316 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4318 * Reverted change of ABI data structures for s390 and s390x:
4319 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4320 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4321 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4322 are preserved pointing straight to the same implementation as the old ones.
4323 Given that, new callers will simply provide a too-big buffer to these
4324 functions. Any applications/libraries out there that embed jmp_buf or
4325 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4326 against 2.19 headers will have to rebuilt again. This is necessary in any
4327 case to revert the breakage in their ABI caused by the glibc change.
4329 * Support for file description locks is added to systems running the
4330 Linux kernel. The standard file locking interfaces are extended to
4331 operate on file descriptions, not file descriptors, via the use of
4332 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4333 are associated with an open file instead of a process.
4335 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4337 * The minimum Linux kernel version that this version of the GNU C Library
4338 can be used with is 2.6.32.
4340 * Running the testsuite no longer terminates as soon as a test fails.
4341 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4342 with PASS or FAIL lines for individual tests. A summary of the results is
4343 printed, including a list of failing lists, and "make check" exits with
4344 error status if there were any unexpected failures. "make check
4345 stop-on-test-failure=y" may be used to keep the old behavior.
4347 * The am33 port, which had not worked for several years, has been removed
4350 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4351 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4352 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4353 conflicted with POSIX (support for which was removed in 2.19), the
4354 interfaces those macros enabled remain available when compiling with
4355 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4356 test macros defined.
4358 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4360 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4361 This may improve lock scaling of existing programs on TX capable systems.
4362 The lock elision code is only built with --enable-lock-elision=yes and
4363 then requires a GCC version supporting the TX builtins. With lock elision
4364 default mutexes are elided via __builtin_tbegin, if the cpu supports
4365 transactions. By default lock elision is not enabled and the elision code
4368 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4369 copy the path argument. This allowed programs to cause posix_spawn to
4370 deference a dangling pointer, or use an unexpected pathname argument if
4371 the string was modified after the posix_spawn_file_actions_addopen
4374 * All supported architectures now use the main glibc sysdeps directory
4375 instead of some being in a separate "ports" directory (which was
4376 distributed separately before glibc 2.17).
4378 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4379 On configurations that support it (all Linux configurations), it's now
4380 used regardless of the --enable-add-ons switch to configure. It is no
4381 longer possible to build such configurations without pthreads support.
4383 * Locale names, including those obtained from environment variables (LANG
4384 and the LC_* variables), are more tightly checked for proper syntax.
4385 setlocale will now fail (with EINVAL) for locale names that are overly
4386 long, contain slashes without starting with a slash, or contain ".." path
4387 components. (CVE-2014-0475) Previously, some valid locale names were
4388 silently replaced with the "C" locale when running in AT_SECURE mode
4389 (e.g., in a SUID program). This is no longer necessary because of the
4392 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4393 with application code using Intel MPX instructions. (With all previous
4394 versions, the MPX register state could be clobbered when making calls
4395 into or out of a shared library.) Note that while the new dynamic
4396 linker is compatible with all known x86 hardware whether or not it
4397 supports Intel MPX, some x86 instruction-set emulators might fail to
4398 handle the new instruction encodings. This is known to affect Valgrind
4399 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4400 release), and might affect other tools that do instruction emulation.
4402 * Support for loadable gconv transliteration modules has been removed.
4403 The support for transliteration modules has been non-functional for
4404 over a decade, and the removal is prompted by security defects. The
4405 normal gconv conversion modules are still supported. Transliteration
4406 with //TRANSLIT is still possible, and the //IGNORE specifier
4407 continues to be supported. (CVE-2014-5119)
4409 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4410 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4411 resulting a denial-of-service security vulnerability in applications which
4412 use functions related to iconv. (CVE-2014-6040)
4416 * The following bugs are resolved with this release:
4418 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4419 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4420 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4421 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4422 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4423 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4424 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4425 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4426 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4427 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4428 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4429 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4430 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4431 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4432 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4433 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4434 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4435 16431, 16453, 16474, 16506, 16510, 16529
4437 * Slovenian translations for glibc messages have been contributed by the
4438 Translation Project's Slovenian team of translators.
4440 * The public headers no longer use __unused nor __block. This change is to
4441 support compiling programs that are derived from BSD sources and use
4442 __unused internally, and to support compiling with Clang's -fblock
4443 extension which uses __block.
4445 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4446 large collation sequences to optimize multiple passes. This cache
4447 computation may overflow for large collation sequences and may cause a
4448 stack or buffer overflow. This is now fixed to use a slower algorithm
4449 which does not use a cache if there is an integer overflow.
4451 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4452 rules for large collation sequences to optimize multiple passes and falls
4453 back to alloca if malloc fails, resulting in a possible stack overflow.
4454 The implementation now falls back to an uncached collation sequence lookup
4457 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4458 initialized for static applications resulting in the security feature
4459 being disabled. The pointer guard is now correctly initialized to a
4460 random value for static applications. Existing static applications need
4461 to be recompiled to take advantage of the fix (bug 15754).
4463 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4464 to the d_name member of struct dirent, or omit the terminating NUL
4465 character. (Bugzilla #14699).
4467 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4468 aligned_alloc functions could allocate too few bytes or corrupt the
4469 heap when passed very large allocation size values (Bugzilla #15855,
4472 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4473 for AF_INET6 has been fixed (Bugzilla #16072).
4475 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4476 pap_CW, quz_PE, the_NP.
4478 * Substantially revised locales: gd_GB, ht_HT
4480 * The LC_ADDRESS field was updated to support country_car for almost all
4483 * ISO 1427 definitions were updated.
4485 * ISO 3166 definitions were updated.
4487 * The localedef utility now supports --big-endian and --little-endian
4488 command-line options to generate locales for a different system from that
4489 for which the C library was built.
4491 * Binary locale files now only depend on the endianness of the system for
4492 which they are generated and not on other properties of that system. As a
4493 consequence, binary files generated with new localedef may be incompatible
4494 with old versions of the GNU C Library, and binary files generated with
4495 old localedef may be incompatible with this version of the GNU C Library,
4496 in the following circumstances:
4498 + Locale files may be incompatible on m68k systems.
4500 + Locale archive files (but not separate files for individual locales) may
4501 be incompatible on systems where plain "char" is signed.
4503 * The configure option --disable-versioning has been removed. Builds with
4504 --disable-versioning had not worked for several years.
4506 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4507 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4509 * SystemTap probes for malloc have been introduced.
4511 * SystemTap probes for slow multiple precision fallback paths of
4512 transcendental functions have been introduced.
4514 * Support for powerpc64le has been added.
4516 * The soft-float powerpc port now supports e500 processors.
4518 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4520 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4521 set of header declarations that are enabled by default, even when other
4522 feature test macros or compiler options such as -std=c99 would otherwise
4523 disable some of those declarations.
4525 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4526 conflict with POSIX. The libbsd-compat library (which was a dummy library
4527 that did nothing) has also been removed.
4529 * Preliminary documentation about Multi-Thread, Async-Signal and
4530 Async-Cancel Safety has been added.
4532 * Change of ABI data structures for s390 and s390x:
4533 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4534 allow for future hardware extensions. All library functions that accept or
4535 return these structures were versioned in order to provide backwards
4536 compatibility with existing code. However, not all cases can be handled
4537 with interface versioning. If an application embeds either structure into
4538 another structure and that structure is passed to another compilation unit
4539 which expects the newer larger-sized object then any access to the new
4540 fields will result in undefined behaviour. Similarly any access to fields
4541 that were moved by the enlarging of the structures will cause undefined
4542 behaviour. To fix the undefined behaviour all objects that are part of the
4543 final in-memory image must agree on the size of structures, and this may
4544 require recompilation.
4548 * The following bugs are resolved with this release:
4550 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4551 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4552 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4553 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4554 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4555 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4556 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4557 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4558 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4559 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4560 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4561 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4562 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4565 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4566 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4567 Distributions can re-enable building and using pt_chown via the new configure
4568 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4569 considerable security risks and should only be used if the distribution
4570 understands and accepts the risks.
4572 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4575 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4576 fixed (Bugzilla #15330).
4578 * Add support for calling C++11 thread_local object destructors on thread
4579 and program exit. This needs compiler support for offloading C++11
4580 destructor calls to glibc.
4582 * Improved worst case performance of libm functions with double inputs and
4585 * Support for priority inherited mutexes in pthread condition variables on
4586 non-x86 architectures.
4588 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4590 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4592 * Optimized string functions for ARM. Implemented by Will Newton and
4595 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4597 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4600 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4601 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4603 * Added a benchmark framework to track performance of functions in glibc.
4605 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4606 It is based on draft TS 18661 and currently enabled as a GNU extension.
4608 * On Linux, the clock function now uses the clock_gettime system call
4609 for improved precision, rather than old times system call.
4611 * Added support for version-3 tz format files. This is needed when using
4612 the tz database release 2013e or later, and affects a few unusual cases --
4613 currently only TZ='America/Godthab' for time stamps after 2037.
4615 * Added new API functions pthread_getattr_default_np and
4616 pthread_setattr_default_np to get and set the default pthread
4617 attributes of a process.
4619 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4620 This may improve lock scaling of existing programs on TSX capable systems.
4621 When the --enable-lock-elision=yes parameter is specified at configure
4622 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4625 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4626 availability). Implemented by Ryan S. Arnold.
4628 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4632 * The following bugs are resolved with this release:
4634 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4635 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4636 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4637 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4638 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4639 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4640 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4641 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4642 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4643 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4644 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4645 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4646 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4647 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4648 14879, 14889, 14893, 14898, 14914.
4650 * Optimization of memcpy for MIPS.
4652 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4653 EMFILE has been fixed (Bugzilla #14889).
4655 * The add-on ports collection is now distributed in the "ports" subdirectory
4656 of the main GNU C Library distribution, rather than separately.
4658 * Port to ARM AArch64 contributed by Linaro.
4660 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4661 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4663 Implemented by Andreas Krebbel.
4665 * The new function secure_getenv allows secure access to the environment,
4666 returning NULL if running in a SUID/SGID process. This function replaces
4667 the internal function __secure_getenv.
4669 * SystemTap static probes have been added into the dynamic linker.
4670 Implemented by Gary Benson.
4672 * Optimizations of string functions strstr, strcasestr and memmem.
4673 Implemented by Maxim Kuvyrkov.
4675 * The minimum Linux kernel version that this version of the GNU C Library
4676 can be used with is 2.6.16.
4678 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4679 powerpc POWER7. Implemented by Will Schmidt.
4681 * New configure option --disable-nscd builds the C library such that it
4682 never attempts to contact the Name Service Caching Daemon (nscd).
4683 New configure option --disable-build-nscd avoids building nscd itself;
4684 this is the default if --disable-nscd is used.
4686 * Improved support for cross-compilation, including cross-testing and
4687 bootstrap builds without a previously built glibc.
4689 * Several testsuite tests are now able to test multiple IFUNC variants of an
4690 interface, rather than just testing the one that would be chooen by
4693 * New configure options --with-bugurl and --with-pkgversion, for
4694 distributors to use to embed their bug-reporting and package version
4695 information in --help and --version output.
4697 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4698 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4699 allows creation of chroots without the procfs mounted on /proc.
4701 * The `crypt' function now fails if passed salt bytes that violate the
4702 specification for those values. On Linux, the `crypt' function will
4703 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4704 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4705 when the mode is enabled.
4707 * The `clock_*' suite of functions (declared in <time.h>) is now available
4708 directly in the main C library. Previously it was necessary to link with
4709 -lrt to use these functions. This change has the effect that a
4710 single-threaded program that uses a function such as `clock_gettime' (and
4711 is not linked with -lrt) will no longer implicitly load the pthreads
4712 library at runtime and so will not suffer the overheads associated with
4713 multi-thread support in other code such as the C++ runtime library.
4715 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4720 * The following bugs are resolved with this release:
4722 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4723 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4724 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4725 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4726 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4727 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4728 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4729 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4730 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4731 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4732 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4733 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4734 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4735 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4736 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4737 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4738 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4739 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4740 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4741 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4742 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4743 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4746 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4747 configuring glibc with:
4748 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4749 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4750 Implemented by H.J. Lu.
4754 + define static_assert
4756 + do not declare gets
4758 + declare at_quick_exit and quick_exit also for ISO C11
4760 + aligned_alloc. NB: The code is deliberately allows the size parameter
4761 to not be a multiple of the alignment. This is a moronic requirement
4762 in the standard but it is only a requirement on the caller, not the
4765 + timespec_get added
4767 + uchar.h support added
4769 + CMPLX, CMPLXF, CMPLXL added
4771 Implemented by Ulrich Drepper.
4773 * Support for the IA-64 has been moved to ports.
4775 * Remove support for anything but ELF binary format
4777 * Checking versions of poll, ppoll added.
4778 Implemented by Ulrich Drepper.
4780 * More generic and 64-bit performance optimizations to math functions.
4781 Implemented by Ulrich Drepper.
4783 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4784 headers and functions available at compile time as they were before
4785 version 2.14. This option will be removed at some time in the future
4786 after the TI-RPC library becomes fully sufficient for the needs of
4787 existing applications.
4789 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4790 Note that glibc is not expected to work with any Linux kernel version
4793 * New header <sys/auxv.h> and function getauxval allowing easy access to
4794 the AT_* key-value pairs passed from the Linux kernel. The header also
4795 defines the HWCAP_* bits associated with the AT_HWCAP key.
4797 * New locales: mag_IN
4799 * New configure option --enable-systemtap builds SystemTap static probes
4800 into libc for setjmp and longjmp and into libpthread for various operations.
4801 So far the setjmp/longjmp probes and some of the libpthread probes are
4802 provided only for i*86 and x86_64.
4803 Implemented by Roland McGrath and Rayson Ho.
4805 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4807 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4810 * More optimized functions for SPARC. Implemented by David S. Miller.
4812 * Improved support for cross-compilation, especially bootstrap builds
4813 without a previously built glibc.
4815 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4816 Chris Metcalf from Tilera.
4818 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4819 now supported for ARM processors.
4821 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4822 as the name of the dynamic linker, to distinguish it from the
4823 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4825 * Support for CRIS has been removed from ports.
4827 * A new class of installed header has been documented for low-level
4828 platform-specific functionality. PowerPC added the first instance with a
4829 function to provide time base register access. Contributed by Tulio
4830 Magno Quites Machado Filho.
4832 * ix86 configurations now install header files that are consistent with
4833 what x86-64 configurations install. These same header files can be used
4834 for -m32, -m64, or -mx32 builds.
4835 Contributed by H.J. Lu.
4837 * Math library bug fixes. A thorough audit of all open math library bugs was
4838 conducted by Joseph Myers. Significant progress was made on many math
4839 library bugs resulting in more accurate exceptions and function results.
4840 Many thanks to all those that contributed including Andreas Jaeger for his
4841 patch review and work on the x87 trigonometric instruction issues.
4843 * Timezone data is no longer installed. Timezone-related binaries and scripts
4844 will continue to be installed. Users should obtain their timezone data from
4845 their distribution provider or from the tzdata package at
4846 <ftp://munnari.oz.au/pub/>.
4850 * The following bugs are resolved with this release:
4852 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4853 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4854 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4855 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4856 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4857 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4858 13484, 13506, 13515, 13523, 13524, 13538, 13540
4860 * New program pldd to list loaded object of a process
4861 Implemented by Ulrich Drepper.
4863 * Add nss_db support back to glibc. No more dependency on Berkeley db
4864 and support for initgroups lookups.
4865 Implemented by Ulrich Drepper.
4867 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4868 Contributed by HJ Lu.
4870 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4871 Contributed by HJ Lu.
4873 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4874 on x86-32 and x86-64.
4875 Contributed by Liubov Dmitrieva.
4877 * Optimized strchr and strrchr for SSE on x86-32.
4878 Contributed by Liubov Dmitrieva.
4880 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4881 for x86-64 and x86-32.
4882 Contributed by Liubov Dmitrieva.
4884 * New interfaces: scandirat, scandirat64
4885 Implemented by Ulrich Drepper.
4887 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4888 Implemented by Ulrich Drepper.
4890 * nscd now also caches the netgroup database.
4891 Implemented by Ulrich Drepper.
4893 * Integrate libm with gcc's -ffinite-math-only option.
4894 Implemented by Ulrich Drepper.
4896 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4897 to math functions. Implemented by Ulrich Drepper.
4899 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4900 Implemented by Ulrich Drepper.
4902 * New Linux interfaces: process_vm_readv, process_vm_writev
4904 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4905 Implemented by Ulrich Drepper.
4907 * Optimized nearbyint and strcasecmp for PPC.
4908 Implemented by Adhemerval Zanella.
4910 * New locales: bho_IN, unm_US, es_CU, ta_LK
4914 * The following bugs are resolved with this release:
4916 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4917 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4918 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4919 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4920 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4921 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4922 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4923 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4924 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4925 12795, 12811, 12813, 12814, 12841
4927 * The RPC implementation in libc is obsoleted. Old programs keep working
4928 but new programs cannot be linked with the routines in libc anymore.
4929 Programs in need of RPC functionality must be linked against TI-RPC.
4930 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4932 Visible changes of this change include (obviously) the inability to link
4933 programs using RPC functions without referencing the TI-RPC library and the
4934 removal of the RPC headers from the glibc headers.
4935 Implemented by Ulrich Drepper.
4937 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4938 syncfs, setns, sendmmsg
4940 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4941 yue_HK, lij_IT, mhr_RU
4943 * New encodings: CP770, CP771, CP772, CP773, CP774
4945 * New program sotruss to trace calls through PLTs
4946 Implemented by Ulrich Drepper.
4948 * The malloc hook implementation is marked deprecated and will be removed
4949 from the default implementation in the next version. The design never
4950 worked ever since the introduction of threads. Even programs which do
4951 not create threads themselves can use multiple threads created internally.
4955 * The following bugs are resolved with this release:
4957 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4958 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4959 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4960 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4963 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4965 * POWER7 optimizations: memset, memcmp, strncmp
4967 * New optimized string functions for x86-64: strnlen (SSE2),
4968 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4969 Implemented by Ulrich Drepper.
4973 * The following bugs are resolved with this release:
4975 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4976 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4977 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4978 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4979 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4980 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4981 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4982 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4984 * New interfaces: pthread_getname_np, pthread_setname_np
4986 * New Linux interface: recvmmsg
4988 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4990 * The dynamic linker now recognizes supported ABI versions from the
4991 EI_ABIVERSION field in the ELF header.
4992 Implemented by Ulrich Drepper.
4994 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4995 will not be used to fill in password fields in the passwd.byname replies.
4996 Instead it is used to synthesize the shadow.byname table, should it be
4997 missing. This is a useful mode in some installations involving Solaris.
4998 Implemented by Ulrich Drepper.
5000 * New locales: kok_IN, sq_MK, cv_RU
5004 * The following bugs are resolved with this release:
5006 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5007 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5008 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5009 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5010 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5011 10789, 10817, 10823, 10840, 10847
5013 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5015 Implemented by Ulrich Drepper.
5017 * Checking version of longjmp added that fails if an uninitialized stack
5018 frame would be created. Implemented by Ulrich Drepper.
5020 * STT_GNU_IFUNC is now supported in static executables.
5021 Implemented by H.J. Lu.
5023 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5025 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5026 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5027 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5028 Contributed by H.J. Lu.
5030 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5031 Implemented by Ulrich Drepper.
5033 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5035 Contributed by H.J. Lu.
5037 * Support for fma instruction in AVX on x86-64.
5038 Implemented by H.J. Lu and Ulrich Drepper.
5040 * AVX support in x86-64 auditing support in ld.so.
5041 Implemented by H.J. Lu.
5043 * STB_GNU_UNIQUE support added.
5044 Implemented by Ulrich Drepper.
5046 * Implement second fallback mode for optimized DNS lookup for even more
5047 broken environments. If two requests from the same port are not
5048 handled correctly close the socket and open a new one before sending
5049 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5050 can be used to select this mode right away, instead of rediscovering the
5051 necessity is every process again.
5052 Implemented by Ulrich Drepper.
5054 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5055 Implemented by Adam Tkac.
5057 * Optimized iconv conversions for S390x.
5058 Implemented by Andreas Krebbel.
5060 * Using condvars with PI mutexes is now more efficient due to kernel
5061 support for requeueing to PI futexes. NPTL support added for x86-64.
5062 Implemented by Ulrich Drepper.
5064 * New locales: ps_AF, my_MM
5068 * The following bugs are resolved with this release:
5070 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5071 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5072 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5073 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5074 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5076 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5077 Implemented by Ulrich Drepper.
5079 * New Linux interfaces: accept4, fallocate, fallocate64.
5080 Implemented by Ulrich Drepper.
5082 * Correct declarations of string function when used in C++ code. This
5083 could lead to compile errors for invalid C++ code.
5085 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5088 * New POSIX 2008 interface: psiginfo
5089 Implemented by Ulrich Drepper.
5091 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5092 Implemented by Ulrich Drepper.
5094 * Support for selecting between multiple function definitions at runtime
5095 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5097 * The libcrypt library can now use the hash function implementations in
5098 NSS. Implemented by Ulrich Drepper.
5100 * The malloc implementation can be compiled to be less memory efficient
5101 but higher performing in multi-threaded programs.
5102 Implemented by Ulrich Drepper.
5104 * New locales: nan_TW@latin, ks_IN
5106 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5107 Implemented by Ulrich Drepper.
5109 * Extended printf hook support. It is possible to use user-defined types
5110 and extend existing format specifiers.
5111 Implemented by Ulrich Drepper.
5113 * Handling for group shadow files has been added.
5114 Implemented by Ulrich Drepper.
5116 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5117 servers (the case, e.g., for some people using the built-in DNS
5118 server in ADSL modems/routers). There is a once-per-process timeout
5119 in case of a broken server. To avoid it, users can run nscd or put
5120 'options single-request' in /etc/resolv.conf.
5121 Implemented by Ulrich Drepper.
5125 * The following bugs are resolved with this release:
5127 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5128 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5129 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5130 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5131 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5133 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5134 up at the same time. Implemented by Ulrich Drepper.
5136 * TLS descriptors for LD and GD on x86 and x86-64.
5137 Implemented by Alexandre Oliva.
5139 * getaddrinfo now handles DCCP and UDPlite.
5140 Implemented by Ulrich Drepper.
5142 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5143 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5144 Implemented by Ulrich Drepper.
5146 * New implementation of memmem, strstr, and strcasestr which is O(n).
5147 Implemented by Eric Blake.
5149 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5151 * Implement "e" option for popen to open file descriptor with the
5152 close-on-exec flag set. Implemented by Ulrich Drepper.
5154 * Implement "b" mode for fmemopen. In this mode writes writes don't
5155 implicitly add a NUL byte and seeks from the end of the buffer really
5156 use the buffer end, not the string length as the basis.
5157 Implemented by Ulrich Drepper.
5159 * Many functions, exported and internal, now atomically set the close-on-exec
5160 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5162 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5164 Implemented by Pravin Satpute.
5166 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5170 * The following bugs are resolved with this release:
5172 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5173 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5174 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5175 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5176 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5177 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5178 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5180 * New locales: bo_CN, bo_IN, shs_CA.
5182 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5184 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5185 Implemented by Pravin Satpute.
5187 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5189 * nscd caches now all timeouts for DNS entries
5190 Implemented by Ulrich Drepper.
5192 * nscd is more efficient and wakes up less often.
5193 Implemented by Ulrich Drepper.
5195 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5196 vdprintf, and obstack_vprintf.
5197 Implemented by Jakub Jelinek.
5199 * Faster memset for x86-64.
5200 Implemented by Harsha Jagasia and H.J. Lu.
5202 * Faster memcpy on x86.
5203 Implemented by Ulrich Drepper.
5205 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5206 Implemented by Ulrich Drepper.
5208 * Faster sqrt and sqrtf implemention for some PPC variants.
5209 Implemented by Steven Munroe.
5213 * The following bugs are resolved with this release:
5215 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5216 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5217 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5218 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5219 5071, 5103, 5104, 5112, 5113, 5184, 5186
5221 * More checking functions: fread, fread_unlocked, open*, mq_open.
5222 Implemented by Jakub Jelinek and Ulrich Drepper.
5224 * Extend fortification to C++. Implemented by Jakub Jelinek.
5226 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5227 by not recognizing 'a' as a modifier when those specs are requested.
5228 Implemented by Jakub Jelinek.
5230 * PPC optimizations to math and string functions.
5231 Implemented by Steven Munroe.
5233 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5234 options to be passed. Implemented by Ulrich Drepper.
5236 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5238 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5239 Implemented by Ulrich Drepper.
5241 * Handle private futexes in the NPTL implementation.
5242 Implemented by Jakub Jelinek and Ulrich Drepper.
5244 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5245 Implemented by Roland McGrath and Ulrich Drepper.
5247 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5249 * SHA-256 and SHA-512 based password encryption.
5250 Implemented by Ulrich Drepper.
5252 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5253 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5256 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5257 Implemented by Ulrich Drepper.
5261 * The following bugs are resolved with this release:
5263 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5264 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5265 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5266 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5267 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5268 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5269 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5272 * New Linux interfaces: epoll_pwait, sched_getcpu.
5274 * New generic interfaces: strerror_l.
5276 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5280 * The following bugs are resolved with this release:
5282 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5283 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5284 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5285 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5286 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5287 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5288 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5289 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5290 3225, 3251, 3252, 3253, 3273
5292 * For Linux, the sorting of addresses returned by getaddrinfo now also
5293 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5294 Implemented by Ulrich Drepper.
5296 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5297 Implemented by Ulrich Drepper.
5299 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5301 * New iconv module for MIK. Contributed by Alexander Shopov.
5303 * For sites with broken group and/or passwd database, the auto-propagate
5304 option of nscd can prevent creating ID lookup entries from the results
5305 of a name lookup and vice versa. This usually is no problem but some
5306 site might have problems with the default behavior.
5307 Implemented by Ulrich Drepper.
5309 * Iterating over entire database in NIS can be slow. With the
5310 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5311 to trade time for memory. The entire database will be read at once.
5312 Implemented by Ulrich Drepper.
5314 * The interfaces introduced in RFC 3542 have been implemented by
5317 * Support for the new ELF hash table format was added by Ulrich Drepper.
5319 * Support for priority inheritance mutexes added by Jakub Jelinek and
5322 * Support for priority protected mutexes added by Jakub Jelinek.
5324 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5325 or_IN, csb_PL, fy_NL, sr_ME.
5329 * More overflow detection functions.
5331 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5332 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5334 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5335 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5336 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5337 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5338 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5339 by Masahide Washizawa.
5341 * It is now possible to install audit libraries for the dynamic linker using
5342 LD_AUDIT. Implemented by Ulrich Drepper.
5344 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5345 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5346 For a libc and libpthread that works well on Linux 2.4 kernels, we
5347 recommend using the stable 2.3 branch.
5349 * The new function open_wmemstream acts like open_memstream,
5350 but uses a wchar_t wide character buffer.
5352 * The new function ppoll is an improved version of poll, similar to pselect.
5354 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5355 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5356 renameat, unlinkat, linkat, symlinkat, readlinkat.
5358 * New Linux kernel system calls: unshare,
5359 inotify_init, inotify_add_watch, inotify_rm_watch.
5361 * The euidaccess function is now also known by the alias eaccess,
5362 for compatibility with some other systems.
5364 * Timezone data updated to 2006b version.
5368 * The following bugs are resolved with this release:
5370 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5371 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5372 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5373 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5374 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5375 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5377 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5379 * As of this release, GCC 4 can be used to compile the C Library.
5381 * Timezone data updated to 2005m version.
5385 * The following bugs are resolved with this release:
5387 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5388 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5389 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5390 777, 787, 821, 822, 823, 825
5392 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5396 * Support for RFC 3678. Real implementations exist only for Linux so far.
5397 Implemented by Ulrich Drepper.
5399 * nscd can now cache entries persistently. Expiring entries are reloaded.
5400 For speedups the cache can be shared in memory with client processes.
5401 Implemented by Ulrich Drepper.
5403 * nscd can now perform SELinux checks.
5404 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5406 * getaddrinfo queries are now cached. Canonical name lookup is performed
5408 Implemented by Ulrich Drepper.
5410 * The nothrow function attribute is used when headers are used by gcc when
5411 compiling C code. This can avoid significant amounts of exception
5414 * The malloc functions perform more error checking and are stricter when
5415 it comes to reacting on errors. The default action is to terminate
5416 the process after showing an error message. Implemented by Ulrich Drepper.
5418 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5419 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5421 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5422 namespaces using the new function dlmopen(). This feature is of course,
5423 like most other dynamic loading functionality, not available in statically
5424 linked applications. Implemented by Ulrich Drepper.
5426 * Low-overhead boundary checking variants of string and some stdio functions
5427 were added. These are to be used in conjunction with a gcc patch by
5428 Jakub Jelinek which adds calls to these functions if possible.
5429 Implemented by Jakub Jelinek and Ulrich Drepper.
5431 * Old code for several operating systems and machine architectures that
5432 have not been in working condition in a long time have been removed from
5433 the main source tree maintained by the GNU C Library's maintainers.
5434 These files are now reside in the separate `ports' source module
5435 that is usable as an add-on when building the library.
5439 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5440 interrogate the dynamic linker, compatible with the Solaris interface.
5442 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5443 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5445 * getifaddrs now uses the netlink interface on Linux to get its information.
5446 Implemented by Thorsten Kukuk.
5448 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5449 Implemented by Ulrich Drepper.
5451 * support for non-executable stacks on x86 has been added. Changes mostly
5454 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5457 * getaddrinfo now performs destination address selection according to
5462 * Thread-safe interfaces for many functions that access locale data
5463 were added in version 2.3, but these features were omitted from NEWS.
5464 Many functions have variants with an `_l' suffix that take a `locale_t'
5465 object as a parameter rather than consulting the current locale.
5466 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5467 create and maintain `locale_t' objects. Additionally, the new function
5468 `uselocale' sets "the current locale" (as used by functions not so
5469 parameterized) set for an individual thread. These features were added
5470 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5472 * The functions getresuid, getresgid, setresuid, and setresgid, which
5473 have long been available on Linux, are now declared in <unistd.h>
5474 and are now also available on the Hurd.
5476 * ELF thread-local storage support (TLS) now works on x86-64.
5478 * The new dynamic string token $LIB is expanded in shared library names.
5479 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5481 * Aldy Hernandez contributed complete software floating point support for
5482 PowerPC machines with no FPU.
5484 * fexecve is implemented on Linux.
5486 * The `btowc' function should work at least twice as fast due to
5487 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5489 * With approriate thread add-ons cancelable functions are now implemented
5490 in libc.so as well. No need to call the function in libpthread. This
5491 change allowed to finally disable the incorrect and expensive handling
5492 of weak definition in ld.so.
5494 * Yet more PLT entries in libc.so have been removed. We finally arrived
5495 at the bare minimum. Startup times improved appropriately.
5497 * Support for the new Linux/x86 system call interface was added. The
5498 AT_SYSINFO auxiliary vector entry is recognized and handled.
5502 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5505 * iconv (the program and the interface) now accepts empty names (excluding
5506 options like //TRANSLIT) to mean "use charset of current locale".
5508 * localedef can now transliterate characters in strings which are not in
5509 the provided charmap. The information from the input locale is used.
5511 * Prelinking support was added for ELF targets. This requires additional
5512 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5514 * Read-only stdio streams now use mmap to speed up operation by eliminating
5515 copying and buffer underflows. To use add 'm' to the mode string of
5516 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5518 * The malloc functions were completely rewritten by Wolfram Gloger based
5519 on Doug Lea's malloc-2.7.0.c.
5521 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5522 implementation of regex.
5524 * Bruno Haible upgraded the iconv and locale implementation to support
5527 * Contents of the LC_* and LANG environment variables in the CEN style are
5528 not recognized anymore. It never was used. Change by Ulrich Drepper.
5530 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5531 thread-local storage (TLS) ABI on some platforms.
5532 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5534 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5535 EUC-JISX0213, and TSCII.
5537 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5538 BSD-compatible interface for getting all network interface addresses.
5539 Implementation for IPv4 by Roland McGrath.
5541 * Loading of locale data is faster due to the introduction of a locale
5542 archive. Implemented by Roland McGrath and Ulrich Drepper.
5544 * Startup times are significantly reduced by not using exported functions
5545 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5548 * Steven Munroe contributed a port to PowerPC64/Linux.
5552 * The Hurd now uses the GNU libio implementation of stdio rather than the
5553 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5555 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5556 with the same behavior as the Linux system call of the same name.
5560 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5561 128-bit long double format.
5563 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5564 IBM1161, and IBM1162 charsets.
5566 * Andreas Jaeger contributed a port to x86-64/Linux.
5568 * Peter Bruin contributed a port to PowerPC/Hurd.
5570 * libc functions using I/O streams now can handle wide-oriented streams
5573 * optimizations in the dynamic linker. Binaries created by recent binutils
5574 versions start up quicker due to reduced time spent on relocations.
5576 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5580 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5581 asinh, atanh, j0 for the 128-bit long double format.
5583 * Bruno Haible updated all the code handling Unicode in some form to
5584 support Unicode 3.1.
5586 * Speed of regex for single-byte locales is back to previous levels.
5587 Patch by Isamu Hasegawa.
5589 * Alpha, SPARC, and IA-64 now also using floating stacks.
5591 * Startup time of internationalized applications greatly improved through
5592 iconv cache. Use iconvconfig to generate the cache file.
5593 Contributed by Ulrich Drepper.
5595 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5596 severe performance problems. Patch by David Mosberger.
5598 * The Hurd port got a lot more functionality like AIO, various stdio
5599 extensions, etc. Mainly done by Roland McGrath.
5601 * mtrace can now lookup symbols in shared libraries.
5605 * Intel's IA-64 math library is largely integrated. It provides fast and
5606 accurate implementatations for most basic and standard math functions
5607 in float, double, and long double format.
5609 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5610 and asin for the 96-bit long double format and asin, log, tan for the
5611 128-bit long double format.
5613 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5614 The basic double functions exist today. Contributed by Abraham Ziv
5615 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5616 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5618 * An asynchronous name lookup library was added. The interface is designed
5619 after POSIX AIO. The proposal was circulated beforehand to get comments.
5620 No negative ones came in. Implemented by Ulrich Drepper.
5622 * Port to S390/64bit contributed by Martin Schwidefsky
5623 <schwidefsky@de.ibm.com>.
5625 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5626 of functions for Linux/IA-64.
5628 * The RPC code is now thread safe. Threads can now use the same service
5629 of different services at the same time. Patch by Eric Norum
5630 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5632 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5633 family of functions for Linux/S390.
5635 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5636 of functions for Linux/x86.
5638 * Port to Linux/CRIS contributed by Axis Communications.
5642 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5643 we can now check for namespace violations and missing declarations. The
5644 result is that almost all headers are now Unix-compliant (as defined in
5645 the upcoming XPG6). The negative side is that some programs might need
5646 corrections, too, if they depend on the incorrect form of the headers in
5647 previous versions which defined too many symbols and included too many
5650 * regex now handles multibyte character sets correctly.
5651 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5653 * iconv (the program) does now conform to the upcoming XPG6 and handles
5654 charmaps. Instead of the charset names the path of charmaps can be
5655 provided and the conversion happens based on this data.
5656 Contributed by Ulrich Drepper.
5658 * The locale program now provides detailed information about the installed
5663 only lists the names of the supported locales
5667 provides details such as country, language, and codeset name.
5668 Contributed by Ulrich Drepper.
5672 * The gencat program now parses the input file according to the charset
5673 selected by the LC_CTYPE category. This is important for stateful
5674 character sets. To make generating catalogs easier there is a way
5675 to overwrite the charset selected by the locale: before the first
5676 message or $ quote line the catalog can contain a line like
5678 $ codeset=ISO-8859-2
5680 to select the charset (ISO-8859-2 in this case).
5682 Implemented by Shinya Hanataka and Ulrich Drepper.
5684 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5685 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5686 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5688 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5689 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5691 * The LANGUAGE environment variable is now ignored unless the locale is
5692 changed from the default "C" locale.
5694 * The usual bug fixes.
5698 * Greg McGary added runtime support for bounds checking using gcc's
5699 new -fbounded-pointers option. ix86 target is complete. PowerPC
5702 * Thorsten Kukuk added secure mode support to nscd.
5704 * The Berkeley db libraries have been removed.
5706 Related, the nss_db module is now in a separate package since it
5707 obviously requires a database library being available.
5709 * Wide character I/O streams implemented by Ulrich Drepper.
5711 * Functions from the extended socket API added by Ulrich Drepper.
5713 * Functions feenableexcept and fedisableexcept to control the
5714 behaviour of individual exceptions have been added by Andreas Jaeger.
5716 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5718 * The resolver code has been updated from bind 8.2.3-T5B which supports
5719 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5722 This change could in some situations effect backward compatibility. Since
5723 now `_res' is a thread-local instead of a global variable, modifying it
5724 in one thread does not have any effect in other threads.
5726 The resolver library was also extended to allow IPv6 as the transport
5727 protocol for the requests. This work was done by Stig Venaas.
5729 * Compatibility code for K&R C compilers has been removed from the
5730 header files. A ISO C compiler is needed to use the library
5731 (conforming to either C89 or C99 standard).
5733 * Complete rewrite of the localedef program to support multibyte character
5734 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5735 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5736 Implemented by Ulrich Drepper.
5738 Bruno Haible significantly improved the generation and use of the data
5739 structures for the wide character tables.
5741 * Plural handling in gettext implemented by Ulrich Drepper.
5743 * The utmp daemon has been removed.
5745 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5747 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5750 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5752 * POSIX barriers implemented by Kaz Kylheku.
5754 * POSIX spawn function family implemented by Ulrich Drepper.
5756 * POSIX spinlocks are now available.
5758 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5760 * the configure option --enable-kernel=X.Y.Z allows to strip out
5761 compatibility for kernel versions before X.Y.Z. This is currently only
5762 implemented for Linux.
5764 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5765 field sin6_scope_id. This means that all programs using IPv6 should be
5766 recompiled. Don't expect binary compatibility with previous glibc
5769 * various conversion modules for IBM character sets contributed by
5772 * IA-64 port by Jes Sorensen and HJ Lu.
5786 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5788 * New xdr functions are added; some rpc functions are now 64bit clean.
5790 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5792 * Fixed known incompatibilities with glibc 2.0.
5794 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5796 * Optimized a number of functions (especially the ELF dynamic loader).
5798 * Update timezone data files.
5800 * lots of charmaps corrections
5802 * some new locale definitions and charmaps
5807 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5808 conform to POSIX member type requirements. Symbol versions have been
5809 adjusted as needed within the library, and for direct use by applications,
5810 but there is potential for problems if third-party libraries use
5811 struct timeval as part of their interface. This does not present
5812 a problem for X and other "essential" system libraries.
5814 * An additional locale model to support C++ Standard Library locale
5815 model and probably more was implemented by Ulrich Drepper.
5817 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5820 * Miles Bader provided the `argp' function family to support hierachical
5821 command line argument parsing, layered on top of getopt.
5823 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5825 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5828 * scanf recognizes the %a and %A format for scanning floating point numbers.
5830 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5831 information and interfaces for the available integer types.
5833 * about 130 new math functions were added to implement the ISO C9x math
5836 * the new header <complex.h> contains definitions of the complex math
5837 functions from ISO C 9X.
5839 * the new header <tgmath.h> defines generic macros to use complex or
5840 real valued functions.
5842 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5844 * Andreas Jaeger provided a test suite for the math library.
5846 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5848 * Ulrich Drepper added character set conversion functions (iconv).
5850 * Optimized string functions have been added.
5852 * The localedata addon is now part of glibc.
5854 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5856 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5857 daemon for NSS (nscd).
5859 Missing a better place here are some numbers on improvements. Under
5860 Linux 2.1.125 un-tar-ing the kernel sources takes
5864 using local files 12.19s 6.88s 22.91s
5866 using NIS 13.92s 8.91s 26.34s
5868 using NIS & nscd 10.37s 7.34s 25.30s
5870 using NIS+ 27.57s 30.37s 640.46s
5872 using NIS+ & nscd 10.25s 7.83s 26.51s
5874 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5876 Keep in mind that non-namelookup related operations dominate above times.
5877 It was just a common complain that using NIS+ unpacking the kernel is
5880 [1] The old nscd implementation is not available anymore since it was
5881 distributed with glibc up to version 2.0.98 and thus is now replaced.
5883 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5885 * Mark Kettenis provided a Hesiod NSS module.
5887 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5888 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5890 * rcmd can now handle netgroups (Dick Streefland).
5892 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5895 * Support for the IPv6 protocol has been added to the socket API, as per the
5896 latest draft standards.
5898 * Support for Linux 2.2 has been added.
5900 * Interface changes relative to the latest 2.0.x release:
5901 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5902 addseverity NEW: Unix98
5903 alphasort64 NEW: LFS
5904 argp_err_exit_status NEW: argp, GNU ext
5905 argp_error NEW: argp, GNU ext
5906 argp_failure NEW: argp, GNU ext
5907 argp_help NEW: argp, GNU ext
5908 argp_parse NEW: argp, GNU ext
5909 argp_program_bug_address NEW: argp, GNU ext
5910 argp_program_version NEW: argp, GNU ext
5911 argp_program_version_hook NEW: argp, GNU ext
5912 argp_state_help NEW: argp, GNU ext
5913 argp_usage NEW: argp, GNU ext
5914 authdes_create NEW: Secure RPC
5915 authdes_getucred NEW: Secure RPC
5916 authdes_pk_create NEW: Secure RPC
5917 backtrace NEW: GNU ext.
5918 backtrace_symbols NEW: GNU ext.
5919 backtrace_symbols_fd NEW: GNU ext.
5921 cacosf NEW: ISO C 9x
5922 cacosh NEW: ISO C 9x
5923 cacoshf NEW: ISO C 9x
5924 cacoshl NEW: ISO C 9x
5925 cacosl NEW: ISO C 9x
5932 casinf NEW: ISO C 9x
5933 casinh NEW: ISO C 9x
5934 casinhf NEW: ISO C 9x
5935 casinhl NEW: ISO C 9x
5936 casinl NEW: ISO C 9x
5938 catanf NEW: ISO C 9x
5939 catanh NEW: ISO C 9x
5940 catanhf NEW: ISO C 9x
5941 catanhl NEW: ISO C 9x
5942 catanl NEW: ISO C 9x
5943 cbc_crypt NEW: Secure RPC
5947 ccoshf NEW: ISO C 9x
5948 ccoshl NEW: ISO C 9x
5954 cimagf NEW: ISO C 9x
5955 cimagl NEW: ISO C 9x
5956 clearerr_locked REMOVED
5957 clntunix_create NEW: sunrpc ext
5959 clog10 NEW: ISO C 9x
5960 clog10f NEW: ISO C 9x
5961 clog10l NEW: ISO C 9x
5971 cprojf NEW: ISO C 9x
5972 cprojl NEW: ISO C 9x
5974 crealf NEW: ISO C 9x
5975 creall NEW: ISO C 9x
5980 csinhf NEW: ISO C 9x
5981 csinhl NEW: ISO C 9x
5984 csqrtf NEW: ISO C 9x
5985 csqrtl NEW: ISO C 9x
5989 ctanhf NEW: ISO C 9x
5990 ctanhl NEW: ISO C 9x
5992 des_setparity NEW: Secure RPC
5993 ecb_crypt NEW: Secure RPC
5994 endutxent NEW: Unix98
5996 exp10f NEW: ISO C 9x
5997 exp10l NEW: ISO C 9x
6001 fattach NEW: STREAMS
6002 fdetach NEW: STREAMS
6006 feclearexcept NEW: ISO C 9x
6007 fegetenv NEW: ISO C 9x
6008 fegetexceptflag NEW: ISO C 9x
6009 fegetround NEW: ISO C 9x
6010 feholdexcept NEW: ISO C 9x
6012 feraiseexcept NEW: ISO C 9x
6013 ferror_locked REMOVED
6014 fesetenv NEW: ISO C 9x
6015 fesetexceptflag NEW: ISO C 9x
6016 fesetround NEW: ISO C 9x
6017 fetestexcept NEW: ISO C 9x
6018 feupdateenv NEW: ISO C 9x
6019 fflush_locked REMOVED
6023 fgets_unlocked NEW: GNU ext.
6024 fileno_locked REMOVED
6036 fputc_locked REMOVED
6037 fputs_unlocked NEW: GNU ext.
6038 fread_unlocked NEW: GNU ext.
6043 fstatvfs NEW: Unix98
6047 ftruncate64 NEW: LFS
6049 fwrite_unlocked NEW: GNU ext.
6050 gai_strerror NEW: IPv6
6054 getchar_locked REMOVED
6056 getdate_err NEW: Unix98
6057 getdate_r NEW: GNU ext.
6059 getnameinfo NEW: IPv6
6060 getnetname NEW: Secure RPC
6061 getpmsg NEW: STREAMS
6062 getpt NEW: Unix98 PTY
6063 getrlimit64 NEW: LFS
6064 getutxent NEW: Unix98
6065 getutxid NEW: Unix98
6066 getutxline NEW: Unix98
6067 glob64 NEW: GNU ext.
6068 globfree64 NEW: GNU ext.
6069 gnu_get_libc_release NEW: GNU ext.
6070 gnu_get_libc_version NEW: GNU ext.
6071 grantpt NEW: Unix98 PTY
6072 host2netname NEW: Secure RPC
6074 iconv_close NEW: iconv
6075 iconv_open NEW: iconv
6076 if_freenameindex NEW: IPv6
6077 if_indextoname NEW: IPv6
6078 if_nameindex NEW: IPv6
6079 if_nametoindex NEW: IPv6
6080 in6addr_any NEW: IPv6
6081 in6addr_loopback NEW: IPv6
6082 inet6_isipv4mapped NEW: IPv6
6083 isastream NEW: STREAMS
6084 iswblank NEW: GNU ext.
6085 key_decryptsession NEW: Secure RPC
6086 key_decryptsession_pk NEW: Secure RPC
6087 key_encryptsession NEW: Secure RPC
6088 key_encryptsession_pk NEW: Secure RPC
6089 key_gendes NEW: Secure RPC
6090 key_get_conv NEW: Secure RPC
6091 key_secretkey_is_set NEW: Secure RPC
6092 key_setnet NEW: Secure RPC
6093 key_setsecret NEW: Secure RPC
6094 llrint NEW: ISO C 9x
6095 llrintf NEW: ISO C 9x
6096 llrintl NEW: ISO C 9x
6097 llround NEW: ISO C 9x
6098 llroundf NEW: ISO C 9x
6099 llroundl NEW: ISO C 9x
6104 lrintf NEW: ISO C 9x
6105 lrintl NEW: ISO C 9x
6106 lround NEW: ISO C 9x
6107 lroundf NEW: ISO C 9x
6108 lroundl NEW: ISO C 9x
6110 makecontext NEW: Unix98
6111 mempcpy NEW: GNU ext.
6114 modify_ldt NEW: kernel
6118 nearbyint NEW: ISO C 9x
6119 nearbyintf NEW: ISO C 9x
6120 nearbyintl NEW: ISO C 9x
6121 netname2host NEW: Secure RPC
6122 netname2user NEW: Secure RPC
6123 nexttoward NEW: ISO C 9x
6124 nexttowardf NEW: ISO C 9x
6125 nexttowardl NEW: ISO C 9x
6129 passwd2des NEW: Secure RPC
6131 pow10f NEW: GNU ext.
6132 pow10l NEW: GNU ext.
6135 printf_size NEW: GNU ext.
6136 printf_size_info NEW: GNU ext.
6137 profil_counter REMOVED
6138 pthread_mutexattr_getkind_np REPLACED
6139 pthread_mutexattr_setkind_np REPLACED
6140 ptsname NEW: Unix98 PTY
6141 ptsname_r NEW: Unix98 PTY
6143 putchar_locked REMOVED
6144 putgrent NEW: GNU ext.
6146 putpmsg NEW: STREAMS
6147 pututxline NEW: Unix98
6151 readdir64_r NEW: LFS
6152 remquo NEW: ISO C 9x
6153 remquof NEW: ISO C 9x
6154 remquol NEW: ISO C 9x
6156 roundf NEW: ISO C 9x
6157 roundl NEW: ISO C 9x
6159 scalbln NEW: ISO C 9x
6160 scalblnf NEW: ISO C 9x
6161 scalblnl NEW: ISO C 9x
6163 sendfile NEW: kernel
6164 setcontext NEW: Unix98
6165 setrlimit64 NEW: LFS
6166 setutxent NEW: Unix98
6168 sigignore NEW: Unix98
6169 sigqueue NEW: POSIX.1b
6170 sigrelse NEW: Unix98
6171 sigset NEW: POSIX.1b
6172 sigtimedwait NEW: POSIX.1b
6173 sigwaitinfo NEW: POSIX.1b
6174 sincos NEW: GNU ext.
6175 sincosf NEW: GNU ext.
6176 sincosl NEW: GNU ext.
6180 strcasestr NEW: GNU ext.
6181 strtoimax NEW: ISO C 9x
6182 strtoumax NEW: ISO C 9x
6183 strverscmp NEW: GNU ext.
6184 svcauthdes_stats NEW: Secure RPC
6185 svcunix_create NEW: sunrpc etx
6186 svcunixfd_create NEW: sunrpc ext
6187 swapcontext NEW: Unix98
6188 tcgetsid NEW: Unix98 PTY
6189 tdestroy NEW: GNU ext.
6190 tgamma NEW: ISO C 9x
6191 tgammaf NEW: ISO C 9x
6192 tgammal NEW: ISO C 9x
6196 truncf NEW: ISO C 9x
6197 truncl NEW: ISO C 9x
6199 unlockpt NEW: Unix98 PTY
6200 updwtmpx NEW: Unix98
6201 user2netname NEW: Secure RPC
6202 utmpxname NEW: Unix98
6203 versionsort NEW: GNU ext.
6204 versionsort64 NEW: GNU ext.
6206 wcscasecmp NEW: GNU ext.
6207 wcsncasecmp NEW: GNU ext.
6208 wcsnlen NEW: GNU ext.
6209 wcstoimax NEW: ISO C 9x
6210 wcstoll NEW: ISO C 9x
6211 wcstoull NEW: ISO C 9x
6212 wcstoumax NEW: ISO C 9x
6214 wordexp NEW: POSIX.2
6215 wordfree NEW: POSIX.2
6216 write_profiling REMOVED
6217 xdecrypt NEW: Secure RPC
6218 xdr_authdes_cred NEW: Secure RPC
6219 xdr_authdes_verf NEW: Secure RPC
6220 xdr_cryptkeyarg NEW: Secure RPC
6221 xdr_cryptkeyarg2 NEW: Secure RPC
6222 xdr_cryptkeyres NEW: Secure RPC
6223 xdr_getcredres NEW: Secure RPC
6224 xdr_key_netstarg NEW: Secure RPC
6225 xdr_key_netstres NEW: Secure RPC
6226 xdr_keybuf NEW: Secure RPC
6227 xdr_keystatus NEW: Secure RPC
6228 xdr_netnamestr NEW: Secure RPC
6229 xdr_sizeof NEW: Secure RPC
6230 xdr_unixcred NEW: sunrpc ext
6231 xencrypt NEW: Secure RPC
6232 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6243 * inet_ntoa is thread-safe
6245 * updwtmp is moved from libutil to libc
6247 * rewrite of cbrt function
6249 * update of timezone data
6263 * add atoll function
6265 * fix complex problems in Berkeley DB code
6267 * fix math functions
6271 * fixed lots of header problems (especially Linux/GNU specific)
6273 * dynamic loader preserves all registers
6275 * Roland McGrath provided support for handling of auxiliary objects in
6276 the ELF dynamic loader.
6278 * support for parallel builds is improved
6282 * GNU extensions are no longer declared by default. To enable them you
6283 must define the macro `_GNU_SOURCE' in your program or compile with
6286 * The library has changed from using GNU ld symbol aliases to using weak
6287 symbols where available. The ELF object file format supports weak
6288 symbols; GNU ld also supports weak symbols in the a.out format. (There
6289 is also now support for other GNU ld extensions in ELF. Use the
6290 `--with-elf' option to configure to indicate you have ELF, and
6291 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6292 of many files which contained only symbol aliases, reducing the size of
6293 the source and the compiled library; many other files were renamed to
6294 less cryptic names previously occupied by the symbol alias files.
6295 There is a new header file <elf.h> for programs which operate on
6296 files in the ELF format.
6298 * Converted to Autoconf version 2, so `configure' has more options.
6299 Run `configure --help' to see the details.
6301 * The library can now be configured to build profiling, highly-optimized
6302 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6303 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6304 `configure' enable building these extra libraries. The shared library is
6305 built by default when using both ELF and GNU ld. When shared libraries
6306 are enabled, the new library `-ldl' is available for arbitrary run-time
6307 loading of shared objects; its interface is defined in <dlfcn.h>. The
6308 new header file <link.h> gives access to the internals of the run-time
6309 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6310 application of same name on other systems and it provides information
6311 about dynamically linked binaries.
6313 * The C library now provides the run-time support code for profiling
6314 executables compiled with `-pg'. Programs can control the profiling code
6315 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6316 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6317 the support for this file format was contributed by David Mosberger-Tang.
6319 * The math code has been replaced with a math library based on fdlibm from
6320 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6321 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6322 functions. The math functions now reside in a separate library, so
6323 programs using them will need to use `-lm' their linking commands.
6325 * John C. Bowman contributed optimized ix87 assembler inline functions.
6327 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6328 mechanism similar to that found in Solaris 2. This is now used for the
6329 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6330 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6331 file controls what services are used for each individual database. This
6332 works by loading shared libraries with names specified in `nsswitch.conf',
6333 so service modules can be changed or added at any time without even
6334 relinking any program. Currently there are the file, db, and NIS based
6335 NSS services available.
6337 * The new functions `strtoq' and `strtouq' parse integer values from
6338 strings, like `strtol' and `strtoul', but they return `long long int' and
6339 `unsigned long long int' values, respectively (64-bit quantities).
6341 * The new functions `strtof' and `strtold' parse floating-point values from
6342 strings, like `strtod', but they return `float' and `long double' values,
6343 respectively (on some machines `double' and `long double' are the same).
6345 * Ulrich Drepper has contributed new implementations of the floating-point
6346 printing and reading code used in the `printf' family of functions and
6347 `strtod', `strtof', and `strtold'. These new functions are perfectly
6348 accurate, and much faster than the old ones.
6350 * The implementation of the POSIX locale model was completely rewritten by
6351 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6352 to compile the POSIX locale definition.
6354 * The former dummy implementations of the strcoll and strxfrm function are
6355 now replaced by fully functional code contributed by Ulrich Drepper. The
6356 collation information comes from the POSIX locale definitions.
6358 * The new header <langinfo.h> defines an interface for accessing
6359 various locale-dependent data (using the locale chosen with `setlocale').
6361 * Ulrich Drepper has contributed a new suite of functions for operation on
6362 wide-character and multibyte-character strings, in <wchar.h>;
6363 and classification and case conversion of wide characters, in <wctype.h>.
6364 These new functions are conforming to the ISO C, Amendement 1 specification.
6366 * There is now a second implementation of the standard I/O library available.
6367 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6368 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6370 * You can now use positional parameter specifications in format strings
6371 for the `printf' and `scanf' families of functions. For example,
6372 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6373 ``Number 6, Mr Jones''. This is mainly useful when providing different
6374 format strings for different languages, whose grammars may dictate
6375 different orderings of the values being printed. To support this
6376 feature, the interface for `register_printf_handler' has changed; see
6377 the header file <printf.h> for details.
6379 * The `printf' and `scanf' families of functions now understand a new
6380 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6381 to group numbers as indicated by the locale; for `scanf' and friends, this
6382 says to accept as valid only a number with all the proper grouping
6383 separators in the right places. In the default "C" locale, numbers are
6384 not grouped; but locales for specific countries will define the usual
6385 conventions (i.e. separate thousands with `,' in the US locale).
6387 * The pgrp functions have been regularized, slightly incompatibly but much
6388 less confusingly. The core functions are now `getpgid' and `setpgid',
6389 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6390 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6391 provided for compatibility. There is no longer an incompatible `getpgrp'
6392 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6394 * The new header file <fts.h> and suite of functions simplify programs that
6395 operate on directory trees. This code comes from 4.4 BSD.
6397 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6398 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6399 NSS scheme used in glibc.
6401 * There is a new malloc debugging hook `__memalign_hook'.
6403 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6404 `unsigned int' in <sys/types.h>. These are for compatibility only and
6405 their use is discouraged.
6407 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6408 done differently, so that it works even without GNU ld.
6410 * New function `euidaccess' checks allowed access to a file like `access',
6411 but using the effective IDs instead of the real IDs.
6413 * The time zone data files have been updated for the latest and greatest
6414 local time conventions of the countries of the world.
6416 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6419 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6420 for formatting floating-point numbers. They are provided only for
6421 compatibility; new programs should use `sprintf' instead. There are
6422 also equivalent function for the `long double' floating-point type and
6423 all functions also exist in a reentrant form.
6425 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6426 functions for maintaining the login-record files (primarily of use to
6427 system programs such as `login'), and convenient functions for
6428 allocating and initializing a pseudo-terminal (pty) device.
6430 * Ulrich Drepper has contributed new support for System V style
6431 shared memory and IPC on systems that support it.
6433 * Ulrich Drepper has contributed several miscellaneous new functions found
6434 in System V: The `hsearch' family of functions provide an effective
6435 implementation of hash tables; `a64l' and `l64a' provide a very simple
6436 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6439 * Ulrich Drepper has contributed new reentrant counterparts for the
6440 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6442 * Ulrich Drepper has contributed new, highly-optimized versions of several
6443 string functions for the i486/Pentium family of processors.
6445 * Ulrich Drepper has updated the Linux-specific code, based largely
6446 on work done in Hongjiu Lu's version of GNU libc for Linux.
6447 The GNU library now supports Linux versions 2.0.10 and later,
6448 using the ELF object file format (i[3456]86-*-linux).
6450 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6452 * David Mosberger-Tang and Richard Henderson have ported the C library
6453 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6454 dynamic linking support for ELF/Alpha.
6456 * Richard Henderson contributed several Alpha optimized assembler function
6457 for arithmetic and string handling.
6459 * Ulrich Drepper has contributed a new set of message catalog functions to
6460 support multiple languages using the <libintl.h> interface, for use with
6461 his new package GNU gettext. Translation volunteers have contributed
6462 catalogs of the library's messages in Spanish, German, and Korean.
6464 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6465 program and the `catgets' function for reading the catalog files it
6466 creates. (The <libintl.h> interface is preferred; we include the
6467 <nl_types.h> interface using `catgets' only for source compatibility with
6468 programs already written to use it.)
6470 * New header file <values.h> gives SVID-compatible names for <limits.h>
6473 * Various new macros, declarations, and small header files for compatibility
6476 * New function `group_member' is a convenient way to check if a process has
6477 a given effective group ID.
6479 * When using GCC 2.7 and later, the socket functions are now declared in a
6480 special way so that passing an argument of type `struct sockaddr_in *',
6481 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6482 `struct sockaddr *' type, does not generate a type-clash warning.
6484 * New function `error' declared in header file <error.h> is a convenient
6485 function for printing error messages and optionally exiting; this is the
6486 canonical function used in GNU programs. The new functions `err', `warn',
6487 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6488 doing the same thing.
6490 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6491 POSIX.2 `glob' function to do ~ and {...} expansion.
6493 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6494 `clearenv' which is used in POSIX.9 is also available.
6496 * New function `getsid' returns session ID number on systems that support it.
6498 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6499 files <db.h> and <mpool.h> provide a rich set of functions for several
6500 types of simple databases stored in memory and in files, and <ndbm.h> is
6501 an old `ndbm'-compatible interface using the `db' functions. Link with
6502 `-ldb' to get these functions.
6504 * New macro `strdupa' copies a string like `strdup', but uses local stack
6505 space from `alloca' instead of dynamic heap space from `malloc'.
6507 * New function `strnlen' is like `strlen' but searches only a given maximum
6508 number of characters for the null terminator. `stpncpy', `strndup' and
6509 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6512 * New function `statfs' in header <sys/statfs.h>.
6514 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6515 provide convenient functions for operating on blocks of null-terminated
6518 * A new suite of functions in <utmp.h> handle all the details of reading
6519 and writing the utmp file.
6521 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6524 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6525 completely POSIX compliant and also implemented the extended functionality
6526 to handle alternate digit representation and alternate era date formats.
6528 * Ulrich Drepper provided an implementation of the `strptime' function
6529 defined in XPG4.2 which transforms a string into a `struct tm' value.
6531 * Paul Eggert provided the tzselect shell script as part of the timezone
6532 code. The shell script makes it easy to select the correct timezone
6535 * The implementation of the malloc family of functions is completely replaced
6536 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6537 The implementation uses the mmap function (if available) and it is
6538 optimized for the use in multi threaded programs.
6540 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6541 functions. This new functionality is usable by specifying a special
6542 salt string and it is compatible with implementation on *BSD systems.
6544 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6545 `getsubopt' to handle second level command line options, `bsd_signal'
6546 to access BSD style `signal' functionality, the obsolete `regexp' style
6549 * the `lchown' function is available on system which support this
6552 * The implementation of the shadow password handling function was contributed
6555 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6557 * POSIX.1g support was added. The <sys/select.h> header is available,
6558 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6559 implementation of `getaddrinfo'.
6563 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6565 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6566 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6568 * The new function `daemon' from 4.4 BSD is useful for server programs that
6569 want to put themselves in the background.
6571 * Joel Sherrill has contributed support for several standalone boards that
6572 run without an operating system.
6574 * `printf', `scanf' and friends now accept a `q' type modifier for long
6575 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6577 * All of the code taken from BSD (notably most of the math and networking
6578 routines) has been updated from the BSD 4.4-Lite release.
6580 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6582 * The new functions `getdomainname' and `setdomainname' fetch or change the
6583 YP/NIS domain name. These are system calls which exist on systems which
6586 * The time zone data files have been updated for the latest international
6589 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6590 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6594 * The C library now includes support for Sun RPC, from Sun's free
6595 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6596 are included. (There is still no support for YP.)
6598 * Tom Quinn has contributed a port of the C library to SGI machines running
6599 Irix 4 (mips-sgi-irix4).
6601 * The new `lockf' function is a simplified interface to the locking
6602 facilities of `fcntl', included for compatibility.
6604 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6606 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6608 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6611 * The error message printed by `assert' for a failed assertion now includes
6612 the name of the program (if using GNU ld) and the name of the calling
6613 function (with versions of GCC that support this).
6615 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6617 * The library now includes the <sys/mman.h> header file and memory
6618 management functions `mmap', `munmap', `mprotect', `msync', and
6619 `madvise', on systems that support those facilities.
6621 * The interface for `mcheck' has changed slightly: the function called to
6622 abort the program when an allocation inconsistency is detected now takes
6623 an argument that indicates the type of failure. The new function
6624 `mprobe' lets you request a consistency check for a particular block at
6625 any time (checks are normally done only when you call `free' or `realloc'
6628 * It is now possible to easily cross-compile the C library, building on one
6629 system a library to run on another machine and/or operating system. All
6630 you need to do is set the variable `HOST_CC' in `configparms' to the
6631 native compiler for programs to run on the machine you are building on (a
6632 few generator programs are used on Unix systems); set `CC' to the
6635 * The new function `fexecve' (only implemented on the GNU system) executes
6636 a program file given a file descriptor already open on the file.
6640 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6641 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6643 * You can set the variable `libprefix' in `configparms' to specify a prefix
6644 to be prepended to installed library files; this makes it easy to install
6645 the GNU C library to be linked as `-lgnuc' or whatever.
6647 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6648 copies a limited number of characters from a string, and returns the
6649 address of the last character written.
6651 * You no longer need to check for whether the installed `stddef.h' is
6652 compatible with the GNU C library. configure now checks for you.
6654 * You can now define a per-stream `fileno' function to convert the
6655 stream's cookie into an integral file descriptor.
6657 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6658 allocates zero bytes of storage, and returns a unique pointer which
6659 you can pass to `realloc' or `free'. The behavior is undefined if
6660 you dereference this pointer.
6662 * The C library now runs on Sony NEWS m68k machines running either
6663 NewsOS 3 or NewsOS 4.
6665 * The new `syscall' function is a system-dependent primitive function
6666 for invoking system calls. It has the canonical behavior on Unix
6667 systems, including unreliable return values for some calls (such as
6668 `pipe', `fork' and `getppid').
6670 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6671 to `EAGAIN', which is the preferred name. On systems whose kernels
6672 use two distinct codes, the C library now translates EWOULDBLOCK to
6673 EAGAIN in every system call function.
6677 * The GNU C Library Reference Manual is now distributed with the library.
6678 `make dvi' will produce a DVI file of the printed manual.
6679 `make info' will produce Info files that you can read on line using C-h i
6680 in Emacs or the `info' program.
6681 Please send comments on the manual to bug-glibc-manual@gnu.org.
6683 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6685 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6687 * Jason Merrill has contributed a port to the Sequent Symmetry running
6688 Dynix version 3 (i386-sequent-dynix).
6690 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6691 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6693 * New function `memory_warnings' lets you arrange to get warnings when
6694 malloc is running out of memory to allocate, like Emacs gives you.
6696 * The C library now contains the relocating allocator used in Emacs 19 for
6697 its editing buffers. This allocator (ralloc) minimizes allocation
6698 overhead and fragmentation by moving allocated regions around whenever it
6699 needs to. You always refer to a ralloc'd region with a "handle" (a
6700 pointer to a pointer--an object of type `void **').
6702 * There is a new `printf' format: `%m' gives you the string corresponding
6703 to the error code in `errno'.
6705 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6706 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6707 pass, the `a' modifier says to fill in a `char **' you pass with a
6710 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6711 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6712 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6714 * `mkstemp' is a traditional Unix function to atomically create and open a
6715 uniquely-named temporary file.
6719 * The standard location for the file that says what the local timezone is
6720 has changed again. It is now `/usr/local/etc/localtime' (or more
6721 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6723 * The distribution no longer contains any files with names longer than 14
6726 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6727 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6729 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6733 * The configuration process has changed quite a bit. The `configure'
6734 script is now used just like the configuration scripts for other GNU
6735 packages. The `sysdeps' directory hierarchy is much rearranged.
6736 The file `INSTALL' explains the new scheme in detail.
6738 * The header files no longer need to be processed into ANSI C and
6739 traditional C versions. There is just one set of files to install, and
6740 it will work with ANSI or old C compilers (including `gcc -traditional').
6742 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6743 MIPS DECStation running Ultrix 4.
6745 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6746 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6747 made itself into a shared library.
6749 * Yet further improved support for the i386, running 4.3 BSD-like systems
6750 (such as Mach 3 with the Unix single-server), or System V.
6752 * New function `strncasecmp' to do case-insensitive string comparison
6753 with limited length.
6755 * New function `strsep' is a reentrant alternative to `strtok'.
6757 * New functions `scandir' and `alphasort' for searching directories.
6759 * New function `setenv' is a better interface to `putenv'.
6761 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6762 function for traversing a directory tree.
6764 * The GNU obstack package is now also part of the C library.
6765 The new function `open_obstack_stream' creates a stdio stream that
6766 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6767 formatted output directly to an obstack.
6769 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6770 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6772 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6774 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6775 things to your strings.
6777 * There are some new test programs: test-fseek, testmb, and testrand.
6779 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6780 These ports are not finished, but are a good starting place for really
6781 supporting those systems.
6783 * `/etc/localtime' is now the standard location for the file that says what
6784 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6785 This follows the general principle that `/etc' is the place for all local
6786 configuration files.
6788 * The C library header files now use `extern "C"' when used by the C++
6789 compiler, so the C library should now work with C++ code.
6791 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6792 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6795 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6796 function which uses the `merge sort' algorithm, and is said to be
6797 significantly faster than the old GNU `qsort' function. Merge sort is
6798 now the standard `qsort' function. The new algorithm can require a lot
6799 of temporary storage; so, the old sorting function is called when the
6800 required storage is not available.
6802 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6803 provides the Unix `crypt' function, plus some other entry points.
6805 * The code and header files taken from 4.4 BSD have been updated with the
6806 latest files released from Berkeley.
6808 ----------------------------------------------------------------------
6811 Permission is granted to anyone to make or distribute verbatim copies
6812 of this document as received, in any medium, provided that the
6813 copyright notice and this permission notice are preserved,
6814 thus giving the recipient permission to redistribute in turn.
6816 Permission is granted to distribute modified versions
6817 of this document, or of portions of it,
6818 under the above conditions, provided also that they
6819 carry prominent notices stating who last changed them.
6822 version-control: never