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 * Bump r_version in the debugger interface to 2 and add a new field,
13 r_next, support multiple namespaces.
15 * Support for the C.UTF-8 locale has been added to glibc. The locale
16 supports full code-point sorting for all valid Unicode code points. A
17 limitation in the framework for fnmatch, regexec, and regcomp requires
18 a compromise to save space and only ASCII-based range expressions are
19 supported for now (see bug 28255). The full size of the locale is
20 only ~400KiB, with 346KiB coming from LC_CTYPE information for
21 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
22 in various downstream distributions. The locale is not built into
23 glibc, and must be installed.
25 * <math.h> functions that round their results to a narrower type, and
26 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
27 18661-3:2015 and draft ISO C2X:
29 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
30 fMxsqrtfN and fMxsqrtfNx functions.
32 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
35 * <math.h> functions for floating-point maximum and minimum,
36 corresponding to new operations in IEEE 754-2019, and corresponding
37 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
38 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
39 fminimum_mag, fminimum_mag_num and corresponding functions for float,
40 long double, _FloatN and _FloatNx.
42 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
43 predefined as specified in TS 18661-1:2014.
45 Deprecated and removed features, and other changes affecting compatibility:
47 * The r_version update in the debugger interface makes the glibc binary
48 incompatible with GDB binaries built without the following commits:
50 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
51 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
53 when audit modules or dlmopen are used.
55 Changes to build and runtime requirements:
57 [Add changes to build and runtime requirements here]
59 Security related changes:
61 [Add security related changes here]
63 The following bugs are resolved with this release:
65 [The release manager will add the list generated by
66 scripts/list-fixed-bugs.py just before the release.]
73 * In order to support smoother in-place-upgrades and to simplify
74 the implementation of the runtime all functionality formerly
75 implemented in the libraries libpthread, libdl, libutil, libanl has
76 been integrated into libc. New applications do not need to link with
77 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
78 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
79 provided, so that the linker options keep working. Applications which
80 have been linked against glibc 2.33 or earlier continue to load the
81 corresponding shared objects (which are now empty). The integration
82 of those libraries into libc means that additional symbols become
83 available by default. This can cause applications that contain weak
84 references to take unexpected code paths that would only have been
85 used in previous glibc versions when e.g. preloading libpthread.so.0,
86 potentially exposing application bugs.
88 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
89 PTHREAD_STACK_MIN is no longer constant and is redefined to
90 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
91 sets for modern architectural features like Arm SVE.
93 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
94 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
95 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
96 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
97 dynamic sized register sets for modern architectural features like
100 * The dynamic linker implements the --list-diagnostics option, printing
101 a dump of information related to IFUNC resolver operation and
102 glibc-hwcaps subdirectory selection.
104 * On Linux, the function execveat has been added. It operates similar to
105 execve and it is is already used to implement fexecve without requiring
106 /proc to be mounted. However, different than fexecve, if the syscall is not
107 supported by the kernel an error is returned instead of trying a fallback.
109 * The ISO C2X function timespec_getres has been added.
111 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
112 C2X, is supported to enable declarations of functions defined in Annex F
113 of C2X. Those declarations are also enabled when
114 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
115 defined, and when _GNU_SOURCE is defined.
117 * On powerpc64*, glibc can now be compiled without scv support using the
118 --disable-scv configure option.
120 * Add support for 64-bit time_t on configurations like x86 where time_t
121 is traditionally 32-bit. Although time_t still defaults to 32-bit on
122 these configurations, this default may change in future versions.
123 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
124 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
125 only enabled for Linux and the full support requires a minimum kernel
128 * The main gconv-modules file in glibc now contains only a small set of
129 essential converter modules and the rest have been moved into a supplementary
130 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
131 in the same GCONV_PATH. Similarly, external converter modules directories
132 may have supplementary configuration files in a gconv-modules.d directory
133 with names ending with .conf to logically classify the converter modules in
136 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
137 to configure the size of the thread stack cache.
139 * The function _Fork has been added as an async-signal-safe fork replacement
140 since Austin Group issue 62 droped the async-signal-safe requirement for
141 fork (and it will be included in the future POSIX standard). The new _Fork
142 function does not run any atfork function neither resets any internal state
143 or lock (such as the malloc one), and only sets up a minimal state required
144 to call async-signal-safe functions (such as raise or execve). This function
145 is currently a GNU extension.
147 * On Linux, the close_range function has been added. It allows efficiently
148 closing a range of file descriptors on recent kernels (version 5.9).
150 * The function closefrom has been added. It closes all file descriptors
151 greater than or equal to a given integer. This function is a GNU extension,
152 although it is also present in other systems.
154 * The posix_spawn_file_actions_addclosefrom_np function has been added,
155 enabling posix_spawn and posix_spawnp to close all file descriptors greater
156 than or equal to a given integer. This function is a GNU extension,
157 although Solaris also provides a similar function.
159 Deprecated and removed features, and other changes affecting compatibility:
161 * The function pthread_mutex_consistent_np has been deprecated; programs
162 should use the equivalent standard function pthread_mutex_consistent
165 * The function pthread_mutexattr_getrobust_np has been deprecated;
166 programs should use the equivalent standard function
167 pthread_mutexattr_getrobust instead.
169 * The function pthread_mutexattr_setrobust_np has been deprecated;
170 programs should use the equivalent standard function
171 pthread_mutexattr_setrobust instead.
173 * The function pthread_yield has been deprecated; programs should use
174 the equivalent standard function sched_yield instead.
176 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
178 * Various rarely-used functions declared in <resolv.h> and
179 <arpa/nameser.h> have been deprecated. Applications are encouraged to
180 use dedicated DNS processing libraries if applicable. For <resolv.h>,
181 this affects the functions dn_count_labels, fp_nquery, fp_query,
182 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
183 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
184 p_type, putlong, putshort, res_hostalias, res_isourserver,
185 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
186 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
187 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
188 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
190 * Various symbols previously defined in libresolv have been moved to libc
191 in order to prepare for libresolv moving entirely into libc (see earlier
192 entry for merging libraries into libc). The symbols __dn_comp,
193 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
194 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
195 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
196 __res_search, __res_send formerly in libresolv have been renamed and no
197 longer have a __ prefix. They are now available in libc.
199 * The pthread cancellation handler is now installed with SA_RESTART and
200 pthread_cancel will always send the internal SIGCANCEL on a cancellation
201 request. It should not be visible to applications since the cancellation
202 handler should either act upon cancellation (if asynchronous cancellation
203 is enabled) or ignore the cancellation internal signal. However there are
204 buggy kernel interfaces (for instance some CIFS versions) that could still
205 see a spurious EINTR error when cancellation interrupts a blocking syscall.
207 * Previously, glibc installed its various shared objects under versioned
208 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
209 were provided as symbolic links. Starting with glibc 2.34, the shared
210 objects are installed under their ABI sonames directly, without
211 symbolic links. This increases compatibility with distribution
212 package managers that delete removed files late during the package
213 upgrade or downgrade process.
215 * The symbols mallwatch and tr_break are now deprecated and no longer used in
216 mtrace. Similar functionality can be achieved by using conditional
217 breakpoints within mtrace functions from within gdb.
219 * The __morecore and __after_morecore_hook malloc hooks and the default
220 implementation __default_morecore have been removed from the API. Existing
221 applications will continue to link against these symbols but the interfaces
222 no longer have any effect on malloc.
224 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
225 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
226 disabled by default in the main C library. Users looking to use these
227 features now need to preload a new debugging DSO libc_malloc_debug.so to get
228 this functionality back.
230 * The deprecated functions malloc_get_state and malloc_set_state have been
231 moved from the core C library into libc_malloc_debug.so. Legacy applications
232 that still use these functions will now need to preload libc_malloc_debug.so
233 in their environment using the LD_PRELOAD environment variable.
235 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
236 __memalign_hook and __free_hook are now removed from the API. Compatibility
237 symbols are present to support legacy programs but new applications can no
238 longer link to these symbols. These hooks no longer have any effect on glibc
239 functionality. The malloc debugging DSO libc_malloc_debug.so currently
240 supports hooks and can be preloaded to get this functionality back for older
241 programs. However this is a transitional measure and may be removed in a
242 future release of the GNU C Library. Users may port away from these hooks by
243 writing and preloading their own malloc interposition library.
245 Changes to build and runtime requirements:
247 * On Linux, the shm_open, sem_open, and related functions now expect the
248 file shared memory file system to be mounted at /dev/shm. These functions
249 no longer search among the system's mount points for a suitable
250 replacement if /dev/shm is not available.
252 Security related changes:
254 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
255 a request for netgroup lookup, may crash due to a double-free,
256 potentially resulting in degraded service or Denial of Service on the
257 local system. Reported by Chris Schanzle.
259 CVE-2021-33574: The mq_notify function has a potential use-after-free
260 issue when using a notification type of SIGEV_THREAD and a thread
261 attribute with a non-default affinity mask.
263 CVE-2021-35942: The wordexp function may overflow the positional
264 parameter number when processing the expansion resulting in a crash.
265 Reported by Philippe Antoine.
267 The following bugs are resolved with this release:
269 [4737] libc: fork is not async-signal-safe
270 [5781] math: Slow dbl-64 sin/cos/sincos for special values
271 [10353] libc: Methods for deleting all file descriptors greater than
272 given integer (closefrom)
273 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
274 name containing multi-byte character(s)
275 [14469] math: Inaccurate j0f function
276 [14470] math: Inaccurate j1f function
277 [14471] math: Inaccurate y0f function
278 [14472] math: Inaccurate y1f function
279 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
281 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
282 crashes if it fails dlsym() twice
283 [15648] nptl: multiple definition of `__lll_lock_wait_private'
284 [16063] nptl: Provide a pthread_once variant in libc directly
285 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
286 [17145] libc: syslog with LOG_CONS leaks console file descriptor
287 [17183] manual: description of ENTRY struct in <search.h> in glibc
289 [18435] nptl: pthread_once hangs when init routine throws an exception
290 [18524] nptl: Missing calloc error checking in
291 __cxa_thread_atexit_impl
292 [19329] dynamic-link: dl-tls.c assert failure at concurrent
293 pthread_create and dlopen
294 [19366] nptl: returning from a thread should disable cancellation
295 [19511] nptl: 8MB memory leak in pthread_create in case of failure
296 when non-root user changes priority
297 [20802] dynamic-link: getauxval NULL pointer dereference after static
299 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
300 [22057] malloc: malloc_usable_size is broken with mcheck
301 [22668] locale: LC_COLLATE: the last character of ellipsis is not
303 [23323] libc: [RFE] CSU startup hardening.
304 [23328] malloc: Remove malloc hooks and ensure related APIs return no
306 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
307 $PLATFORM, $ORIGIN) crashes
308 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
309 [23554] nptl: pthread_getattr_np reports wrong stack size with
311 [24106] libc: Bash interpreter in ldd script is taken from host
312 [24773] dynamic-link: dlerror in an secondary namespace does not use
313 the right free implementation
314 [25036] localedata: Update collation order for Swedish
315 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
316 shm_open to pick wrong directory
317 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
318 crash in IFUNC resolver due to stack canary (--enable-stack-
320 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
321 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
322 [27111] dynamic-link: pthread_create and tls access use link_map
323 objects that may be concurrently freed by dlclose
324 [27132] malloc: memusagestat is linked to system librt, leading to
325 undefined symbols on major version upgrade
326 [27136] dynamic-link: dtv setup at thread creation may leave an entry
328 [27249] libc: libSegFault.so does not output signal number properly
329 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
331 [27318] dynamic-link: glibc fails to load binaries when built with
332 -march=sandybridge: CPU ISA level is lower than required
333 [27343] nss: initgroups() SIGSEGVs when called on a system without
334 nsswich.conf (in a chroot)
335 [27346] dynamic-link: x86: PTWRITE feature check is missing
336 [27389] network: NSS chroot hardening causes regressions in chroot
338 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
339 [27444] libc: sysconf reports unsupported option (-1) for
340 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
341 [27462] nscd: double-free in nscd (CVE-2021-27645)
342 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
343 malloc/tst-malloc-thread-fail
344 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
345 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
347 [27522] glob: glob, glob64 incorrectly marked as __THROW
348 [27555] dynamic-link: Static tests fail with --enable-stack-
350 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
351 information for the current directory
352 [27577] dynamic-link: elf/ld.so --help doesn't work
353 [27605] libc: tunables can't control xsave/xsavec selection in
355 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
356 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
358 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
359 _nss_files_getcanonname_r) from within a dlmopen namespace.
360 [27648] libc: FAIL: misc/tst-select
361 [27650] stdio: vfscanf returns too early if a match is longer than
363 [27651] libc: Performance regression after updating to 2.33
364 [27655] string: Wrong size calculation in string/test-strnlen.c
365 [27706] libc: select fails to update timeout on error
366 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
367 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
368 tries resolving them lazily
369 [27744] nptl: Support different libpthread/ld.so load orders in
371 [27749] libc: Data race __run_exit_handlers
372 [27761] libc: getconf: Segmentation fault when passing '-vq' as
374 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
375 exceeds maximum object size 2147483647
376 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
378 [27872] build: Obsolete configure option --enable-stackguard-
380 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
381 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
382 [27892] libc: powerpc: scv ABI error handling fails to check
384 [27896] nptl: mq_notify does not handle separately allocated thread
385 attributes (CVE-2021-33574)
386 [27901] libc: TEST_STACK_ALIGN doesn't work
387 [27902] libc: The x86-64 clone wrapper fails to align child stack
388 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
389 [27939] libc: aarch64: clone does not align the stack
390 [27968] libc: s390x: clone does not align the stack
391 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
392 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
394 [28028] malloc: malloc: tcache shutdown sequence does not work if the
395 thread never allocated anything
396 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
397 [28064] string: x86_64:wcslen implementation list has wcsnlen
398 [28067] libc: FAIL: posix/tst-spawn5
399 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
400 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
402 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
403 [28089] build: tst-tls20 fails when linker defaults to --as-needed
404 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
406 [28091] network: ns_name_skip may return 0 for domain names without
414 * The dynamic linker accepts the --list-tunables argument which prints
415 all the supported tunables. This option is disable if glibc is
416 configured with tunables disabled (--enable-tunables=no).
418 * The dynamic linker accepts the --argv0 argument and provides opportunity
419 to change argv[0] string.
421 * The dynamic linker loads optimized implementations of shared objects
422 from subdirectories under the glibc-hwcaps directory on the library
423 search path if the system's capabilities meet the requirements for
424 that subdirectory. Initially supported subdirectories include
425 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
426 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
427 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
428 subdirectory names correspond to the vendor-independent x86-64
429 microarchitecture levels defined in the x86-64 psABI supplement.
431 * The new --help option of the dynamic linker provides usage and
432 information and library search path diagnostics.
434 * The mallinfo2 function is added to report statistics as per mallinfo,
435 but with larger field widths to accurately report values that are
436 larger than fit in an integer.
438 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
440 * Support for the RISC-V ISA running on Linux has been expanded to run on
441 32-bit hardware. This is supported for the following ISA and ABI pairs:
447 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
450 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
451 glibc may use additional checks that may have an additional performance
452 overhead. At present these checks are available only on LLVM 9 and later.
453 The latest GCC available at this time (10.2) does not support this level of
456 Deprecated and removed features, and other changes affecting compatibility:
458 * The mallinfo function is marked deprecated. Callers should call
461 * When dlopen is used in statically linked programs, alternative library
462 implementations from HWCAP subdirectories are no longer loaded.
463 Instead, the default implementation is used.
465 * The deprecated <sys/vtimes.h> header and the function vtimes have been
466 removed. To support old binaries, the vtimes function continues to exist
467 as a compatibility symbol. Applications should use the getrlimit or
470 * Following a change in the tzdata 2018a release upstream, the zdump
471 program is now installed in the /usr/bin subdirectory. Previously,
472 the /usr/sbin subdirectory was used.
474 * On s390(x), the type float_t is now derived from the macro
475 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
476 hardcoded to double. This does not affect the ABI of any libraries
477 that are part of the GNU C Library, but may affect the ABI of other
478 libraries that use this type in their interfaces. The new definition
479 improves consistency with compiler behavior in many scenarios.
481 * A future version of glibc will stop loading shared objects from the
482 "tls" subdirectories on the library search path, the subdirectory that
483 corresponds to the AT_PLATFORM system name, and also stop employing
484 the legacy AT_HWCAP search mechanism. Applications should switch to
485 the new glibc-hwcaps mechanism instead; if they do not do that, only
486 the baseline version (directly from the search path directory) will be
489 Changes to build and runtime requirements:
491 * On Linux, the system administrator needs to configure /dev/pts with
492 the intended access modes for pseudo-terminals. glibc no longer
493 attemps to adjust permissions of terminal devices. The previous glibc
494 defaults ("tty" group, user read/write and group write) already
495 corresponded to what most systems used, so that grantpt did not
496 perform any adjustments.
498 * On Linux, the posix_openpt and getpt functions no longer attempt to
499 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
500 (and pseudo-terminals are supported), a devpts file system is mounted
501 on /dev/pts. Current systems already meet these requirements.
503 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
505 Security related changes:
507 CVE-2021-3326: An assertion failure during conversion from the
508 ISO-20220-JP-3 character set using the iconv function has been fixed.
509 This assertion was triggered by certain valid inputs in which the
510 converted output contains a combined sequence of two wide characters
511 crossing a buffer boundary. Reported by Tavis Ormandy.
513 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
514 invoked with input containing redundant shift sequences in the IBM1364,
515 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
517 CVE-2020-29562: An assertion failure has been fixed in the iconv function
518 when invoked with UCS4 input containing an invalid character.
520 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
521 invoked with EUC-KR input containing invalid multibyte input sequences.
523 The following bugs are resolved with this release:
525 [10635] libc: realpath portability patches
526 [16124] dynamic-link: ld.so should allow to change argv[0]
527 [17924] malloc: 'free' should not set errno
528 [18683] libc: Linux faccessat implementation can incorrectly ignore
530 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
531 [23091] hurd: missing waitid support
532 [23249] libc: Epyc and other current AMD CPUs do not select the
533 "haswell" platform subdirectory
534 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
536 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
538 [24941] libc: Make grantpt usable after multi-threaded fork in more
540 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
541 [24973] locale: iconv encounters segmentation fault when converting
542 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
543 [25399] string: undefined reference to `__warn_memset_zero_len' when
544 changing gnuc version
545 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
547 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
549 [25971] libc: s390 bits/hwcap.h out of sync with kernel
550 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
551 [26100] libc: Race in syslog(3) with regards to tag printing.
552 [26124] libc: Export <cpu-features.h>
553 [26130] nscd: Inconsistent nscd cache during pruning
554 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
555 [26224] locale: iconv hangs when converting some invalid inputs from
556 several IBM character sets (CVE-2020-27618)
557 [26341] libc: realpath cyclically call __alloca(path_max) to consume
559 [26343] manual: invalid documented return type for strerrorname_np(),
560 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
561 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
563 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
565 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
566 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
568 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
569 [26553] libc: mtx_init allows type set to "mtx_recursive" only
570 [26555] string: strerrorname_np does not return the documented value
571 [26592] libc: pointer arithmetic overflows in realpath
572 [26600] network: Transaction ID collisions cause slow DNS lookups in
574 [26606] libc: [2.33 Regression] pselect is broken on x32
575 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
576 [26620] glob: fnmatch with collating symbols results in segmentation
578 [26625] libc: [2.33 Regression] CET is disabled
579 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
580 at the end of a memory mapping
581 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
582 by the caller to the kernel
583 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
584 [26647] build: [-Werror=array-parameter=] due to different
585 declarations for __sigsetjmp
586 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
588 [26649] stdio: printf should handle non-normal x86 long double numbers
589 gracefully (CVE-2020-29573)
590 [26686] build: -Warray-parameter instances building with GCC 11
591 [26687] build: -Warray-bounds instances building with GCC 11
592 [26690] stdio: Aliasing violation in __vfscanf_internal
593 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
594 [26726] build: GCC warning calling new_composite_name with an array of
596 [26736] libc: FAIL: misc/tst-sysvshm-linux
597 [26737] libc: Random FAIL: rt/tst-shm
598 [26791] libc: Missing O_CLOEXEC in sysconf.c
599 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
601 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
603 [26818] string: aarch64: string tests may run ifunc variants that are
605 [26821] libc: Memory leak test failures on Fedora 33
606 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
607 FSGSBASE/LM/RDRAND check failure
608 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
610 [26853] libc: aarch64: Missing unwind information in statically linked
612 [26923] locale: Assertion failure in iconv when converting invalid
613 UCS4 (CVE-2020-29562)
614 [26926] dynamic-link: aarch64: library dependencies are not bti
616 [26932] libc: sh: Multiple floating point functions defined as stubs
618 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
620 [26988] dynamic-link: aarch64: BTI mprotect address is not page
622 [27002] build: libc_freeres_fn build failure with GCC 11
623 [27004] dynamic-link: ld.so is miscompiled by GCC 11
624 [27008] dynamic-link: ld.so.cache should have endianness markup
625 [27042] libc: [alpha] anonymous union in struct stat confuses
627 [27053] libc: Conformance regression in system(3) (and probably also
629 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
631 [27077] network: Do not reload /etc/nsswitch.conf from chroot
632 [27083] libc: Unsafe unbounded alloca in addmntent
633 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
635 [27130] string: "rep movsb" performance issue
636 [27150] libc: alpha: wait4() is unavailable in static linking
637 [27177] dynamic-link:
638 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
640 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
641 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
642 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
643 related to combining characters (CVE-2021-3326)
650 * Unicode 13.0.0 Support: Character encoding, character type info, and
651 transliteration tables are all updated to Unicode 13.0.0, using
652 generator scripts contributed by Mike FABIAN (Red Hat).
654 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
656 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
657 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
658 Three ABIs are supported:
664 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
665 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
667 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
668 DT_DEPAUDIT dynamic section entries of the main executable.
670 * powerpc64le supports IEEE128 long double libm/libc redirects when
671 using -mabi=ieeelongdouble to compile C code on supported GCC
672 toolchains. It is recommended to use GCC 8 or newer when testing
675 * To help detect buffer overflows and other out-of-bounds accesses
676 several APIs have been annotated with GCC 'access' attribute. This
677 should help GCC 10 issue better warnings.
679 * On Linux, functions pthread_attr_setsigmask_np and
680 pthread_attr_getsigmask_np have been added. They allow applications
681 to specify the signal mask of a thread created with pthread_create.
683 * The GNU C Library now provides the header file <sys/single_threaded.h>
684 which declares the variable __libc_single_threaded. Applications are
685 encouraged to use this variable for single-thread optimizations,
686 instead of weak references to symbols historically defined in
689 * The functions sigabbrev_np and sigdescr_np have been added. The
690 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
691 SIGHUP) while sigdescr_np returns a string describing the signal number
692 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
693 attempt to translate the return description, both functions return
694 NULL for an invalid signal number.
696 They should be used instead of sys_siglist or sys_sigabbrev and they
697 are both thread and async-signal safe. These functions are GNU extensions.
699 * The functions strerrorname_np and strerrordesc_np have been added. The
700 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
701 while strerrordesc_np returns a string describing the error number
702 (e.g "Invalid argument" for EINVAL). Different than strerror,
703 strerrordesc_np does not attempt to translate the return description, both
704 functions return NULL for an invalid error number.
706 They should be used instead of sys_errlist and sys_nerr, both are
707 thread and async-signal safe. These functions are GNU extensions.
709 * AArch64 now supports standard branch protection security hardening
710 in glibc when it is built with a GCC that is configured with
711 --enable-standard-branch-protection (or if -mbranch-protection=standard
712 flag is passed when building both GCC target libraries and glibc,
713 in either case a custom GCC is needed). This includes branch target
714 identification (BTI) and pointer authentication for return addresses
715 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
716 extensions respectively for the protection to be effective,
717 otherwise the used instructions are nops. User code can use PAC-RET
718 without libc support, but BTI requires a libc that is built with BTI
719 support, otherwise runtime objects linked into user code will not be
722 Deprecated and removed features, and other changes affecting compatibility:
724 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
725 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
726 RPC header files. Backward compatibility for old programs is kept
727 only for architectures and ABIs that have been added in or before
728 glibc 2.31. New programs need to use TI-RPC
729 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
730 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
732 * Remove configure option --enable-obsolete-nsl. libnsl is only built
733 as shared library for backward compatibility and the NSS modules "nis"
734 and "nisplus" are not built at all and libnsl's headers aren't
735 installed. This compatibility is kept only for architectures and ABIs
736 that have been added in or before version 2.28. Replacement
737 implementations based on TI-RPC, which additionally support IPv6, are
738 available from <https://github.com/thkukuk/>. This change does not
739 affect the "compat" NSS module, which does not depend on libnsl
740 since 2.27 and thus can be used without NIS.
742 * The deprecated <sys/sysctl.h> header and the sysctl function have been
743 removed. To support old binaries, the sysctl function continues to
744 exist as a compatibility symbol (on those architectures which had it),
745 but always fails with ENOSYS. This reflects the removal of the system
746 call from all architectures, starting with Linux 5.5.
748 * The sstk function is no longer available to newly linked binaries.
749 Its implementation always returned with a failure, and the function
750 was not declared in any header file.
752 * The legacy signal handling functions siginterrupt, sigpause, sighold,
753 sigrelse, sigignore and sigset, and the sigmask macro have been
754 deprecated. Applications should use the sigsuspend, sigprocmask and
755 sigaction functions instead.
757 * ldconfig now defaults to the new format for ld.so.cache. glibc has
758 already supported this format for almost 20 years.
760 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
761 are no longer available to newly linked binaries, and their declarations
762 have been removed from <string.h>. They are exported solely as
763 compatibility symbols to support old binaries. All programs should use
766 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
767 are no longer available to newly linked binaries, and their declarations
768 have been removed from <stdio.h>. They are exported solely as
769 compatibility symbols to support old binaries. All programs should use
770 strerror or strerror_r instead.
772 * Both strerror and strerror_l now share the same internal buffer in the
773 calling thread, meaning that the returned string pointer may be invalided
774 or contents might be overwritten on subsequent calls in the same thread or
775 if the thread is terminated. It makes strerror MT-safe.
777 * Using weak references to libpthread functions such as pthread_create
778 or pthread_key_create to detect the singled-threaded nature of a
779 program is an obsolescent feature. Future versions of glibc will
780 define pthread_create within libc.so.6 itself, so such checks will
781 always flag the program as multi-threaded. Applications should check
782 the __libc_single_threaded variable declared in
783 <sys/single_threaded.h> instead.
785 * The "files" NSS module no longer supports the "key" database (used for
786 secure RPC). The contents of the /etc/publickey file will be ignored,
787 regardless of the settings in /etc/nsswitch.conf. (This method of
788 storing RPC keys only supported the obsolete and insecure AUTH_DES
789 flavor of secure RPC.)
791 * The __morecore and __after_morecore_hook malloc hooks and the default
792 implementation __default_morecore have been deprecated. Applications
793 should use malloc interposition to change malloc behavior, and mmap to
794 allocate anonymous memory. A future version of glibc may require that
795 applications which use the malloc hooks must preload a special shared
796 object, to enable the hooks.
798 * The hesiod NSS module has been deprecated and will be removed in a
799 future version of glibc. System administrators are encouraged to
800 switch to other approaches for networked account databases, such as
803 Changes to build and runtime requirements:
805 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
806 long double redirects.
808 Security related changes:
810 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
811 invoked with the -c option and when processing invalid multi-byte input
812 sequences. Reported by Jan Engelhardt.
814 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
815 corruption when they were passed a pseudo-zero argument. Reported by Guido
816 Vranken / ForAllSecure Mayhem.
818 CVE-2020-1752: A use-after-free vulnerability in the glob function when
819 expanding ~user has been fixed.
821 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
822 memmove functions has been fixed. Discovered by Jason Royes and Samual
823 Dytrych of the Cisco Security Assessment and Penetration Team (See
826 The following bugs are resolved with this release:
828 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
829 [10441] manual: Backtraces code example lacks error checking
830 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
831 timer_sigev_thread dangerous
832 [14231] stdio: stdio-common tests memory requirements
833 [14578] libc: /proc-based emulation for lchmod, fchmodat
834 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
835 filtee has constructor
836 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
837 sequences (CVE-2016-10228)
838 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
839 character entities for infinity & pi
840 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
841 segfaults in applications
842 [20543] libc: Please move from .gnu.linkonce to comdat
843 [22489] network: gcc warns about implicit convertion in
844 ICMP6_FILTER_SETPASS with -Wsign-conversion
845 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
846 [23294] math: Complex _FloatN functions are redirected to the wrong
847 function with -mlong-double-64
848 [23296] libc: Data race in setting function descriptor during lazy
850 [23668] dynamic-link: ldconfig: Default to the new format for
852 [23819] hurd: hurd: Add C11 thread support
853 [23990] build: test-container error out on failure to exec child.
854 [23991] build: shell-container typo in run_command_array
855 [24638] manual: Error in example of parsing a template string
856 [24654] manual: Wrong declaration of wcschr in libc manual
857 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
859 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
860 dynamically loaded dsos
861 [25098] nptl: nptl: ctype classification functions are not AS-Safe
862 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
864 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
865 restore EAX, ECX and EDX
866 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
867 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
868 [25420] network: Race condition in resolv_conf.c can result in caching
869 stale configuration forever
870 [25487] math: sinl() stack corruption from crafted input
872 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
874 [25523] libc: MIPS/Linux inline syscall template is miscompiled
875 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
877 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
878 on 32 bit and old kernel
879 [25635] libc: arm: Wrong sysdep order selection for soft-fp
880 [25639] localedata: Some names of days and months wrongly spelt in
882 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
883 amount of sigset_t bytes
884 [25691] stdio: printf: memory leak when printing long multibyte
886 [25715] libc: system() returns wrong errors when posix_spawn fails
887 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
888 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
889 state for conversions that produce two Unicode code points
890 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
891 for linux x86_64 leads to livelock
892 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
893 test failures, invalid instruction in ld.so
894 [25790] glob: Typo in tst-fnmatch.input
895 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
897 [25819] localedata: Update locale data to Unicode 13.0.0
898 [25824] libc: Abnormal function of strnlen in aarch64
899 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
900 [25896] libc: Incorrect prctl
901 [25902] libc: Bad LOADARGS_N
902 [25905] dynamic-link: VSX registers are corrupted during PLT
903 resolution when glibc is built with --disable-multi-arch and --with-
905 [25933] string: Off by one error in __strncmp_avx2 when
906 length=VEC_SIZE*4 and strings are at page boundaries can cause a
908 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
909 exiting detached thread
910 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
912 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
914 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
915 [26073] math: getpayload() has wrong return value
916 [26076] dynamic-link: dlmopen crashes after failing to load
917 dependencies in audit mode
918 [26120] localedata: column width of of some Korean
919 JUNGSEONG/JONGSEONG characters wrong (should be 0)
920 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
921 [26133] libc: Incorrect need_arch_feature_F16C
922 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
924 [26149] libc: PKU is usable only if OSPKE is set
925 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
927 [26208] libc: Incorrect bit_cpu_CLFSH
928 [26210] network: Incorrect use of hidden symbols for global sunrpc
930 [26211] stdio: printf integer overflow calculating allocation size
931 [26214] stdio: printf_fp double free
932 [26215] stdio: printf_fp memory leak
933 [26232] time: FAIL: support/tst-timespec for 32-bit targets
934 [26258] nss: nss_compat should not read input files with mmap
935 [26332] string: Incorrect cache line size load causes memory
943 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
944 enable features from the draft ISO C2X standard. Only some features from
945 this draft standard are supported by the GNU C Library, and as the draft
946 is under active development, the set of features enabled by this macro is
947 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
948 by compiling with "gcc -std=gnu2x".
950 * The <math.h> functions that round their results to a narrower type now
951 have corresponding type-generic macros in <tgmath.h>, as defined in TS
952 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
953 Clarification Request 13 to TS 18661-3.
955 * The function pthread_clockjoin_np has been added, enabling join with a
956 terminated thread with a specific clock. It allows waiting against
957 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
959 * New locale added: mnw_MM (Mon language spoken in Myanmar).
961 * The DNS stub resolver will optionally send the AD (authenticated data) bit
962 in queries if the trust-ad option is set via the options directive in
963 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
964 mode, the AD bit, as provided by the name server, is available to
965 applications which call res_search and related functions. In the default
966 mode, the AD bit is not set in queries, and it is automatically cleared in
967 responses, indicating a lack of DNSSEC validation. (Therefore, the name
968 servers and the network path to them are treated as untrusted.)
970 Deprecated and removed features, and other changes affecting compatibility:
972 * The totalorder and totalordermag functions, and the corresponding
973 functions for other floating-point types, now take pointer arguments to
974 avoid signaling NaNs possibly being converted to quiet NaNs in argument
975 passing. This is in accordance with the resolution of Clarification
976 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
977 floating-point arguments directly will continue to work.
979 * The obsolete function stime is no longer available to newly linked
980 binaries, and its declaration has been removed from <time.h>.
981 Programs that set the system time should use clock_settime instead.
983 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
984 in a future version of glibc. In this release, the header still exists
985 but calling ftime will cause a compiler warning. All programs should use
986 gettimeofday or clock_gettime instead.
988 * The gettimeofday function no longer reports information about a
989 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
990 many years, as it cannot handle the full complexity of the world's
991 timezones, but hitherto we have supported it on a best-effort basis.
992 Changes required to support 64-bit time_t on 32-bit architectures have
993 made this no longer practical.
995 As of this release, callers of gettimeofday with a non-null 'tzp' argument
996 should expect to receive a 'struct timezone' whose tz_minuteswest and
997 tz_dsttime fields are zero. (For efficiency reasons, this does not always
998 happen on a few Linux-based ports. This will be corrected in a future
1001 All callers should supply a null pointer for the 'tzp' argument to
1002 gettimeofday. For accurate information about the time zone associated
1003 with the current time, use the localtime function.
1005 gettimeofday itself is obsolescent according to POSIX. We have no plans
1006 to remove access to this function, but portable programs should consider
1007 using clock_gettime instead.
1009 * The settimeofday function can still be used to set a system-wide time
1010 zone when the operating system supports it. This is because the Linux
1011 kernel reused the API, on some architectures, to describe a system-wide
1012 time-zone-like offset between the software clock maintained by the kernel,
1013 and the "RTC" clock that keeps time when the system is shut down.
1015 However, to reduce the odds of this offset being set by accident,
1016 settimeofday can no longer be used to set the time and the offset
1017 simultaneously. If both of its two arguments are non-null, the call
1018 will fail (setting errno to EINVAL).
1020 Callers attempting to set this offset should also be prepared for the call
1021 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1022 some Linux architectures. The Linux kernel maintainers are discussing a
1023 more principled replacement for the reused API. After a replacement
1024 becomes available, we will change settimeofday to fail with ENOSYS on all
1025 platforms when its 'tzp' argument is not a null pointer.
1027 settimeofday itself is obsolescent according to POSIX. Programs that set
1028 the system time should use clock_settime and/or the adjtime family of
1029 functions instead. We may cease to make settimeofday available to newly
1030 linked binaries after there is a replacement for Linux's time-zone-like
1033 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1034 the optional CAS instruction is implemented (for instance, LEON processors
1035 are still supported, but SuperSPARC processors are not).
1037 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1040 * If a lazy binding failure happens during dlopen, during the execution of
1041 an ELF constructor, the process is now terminated. Previously, the
1042 dynamic loader would return NULL from dlopen, with the lazy binding error
1043 captured in a dlerror message. In general, this is unsafe because
1044 resetting the stack in an arbitrary function call is not possible.
1046 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1047 executable stack unless explicitly configured at build time to require
1048 minimum kernel version 4.8 or newer. This is because executing
1049 floating-point branches on a non-executable stack on Linux kernels prior to
1050 4.8 can lead to application crashes for some MIPS configurations. While
1051 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1052 expected to enable non-executable stack by default with PT_GNU_STACK by
1053 default and is thus likely to trigger a crash on older kernels.
1055 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1056 non-executable stack while dropping support for older kernels.
1058 * System call wrappers for time system calls now use the new time64 system
1059 calls when available. On 32-bit targets, these wrappers attempt to call
1060 the new system calls first and fall back to the older 32-bit time system
1061 calls if they are not present. This may cause issues in environments
1062 that cannot handle unsupported system calls gracefully by returning
1063 -ENOSYS. Seccomp sandboxes are affected by this issue.
1065 Changes to build and runtime requirements:
1067 * It is no longer necessary to have recent Linux kernel headers to build
1068 working (non-stub) system call wrappers on all architectures except 64-bit
1069 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1071 * The ChangeLog file is no longer present in the toplevel directory of the
1072 source tree. ChangeLog files are located in the ChangeLog.old directory as
1073 ChangeLog.N where the highest N has the latest entries.
1075 Security related changes:
1077 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1078 out-of-bounds write when executed in a signal frame context.
1080 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1081 environment variable during program execution after a security
1082 transition, allowing local attackers to restrict the possible mapping
1083 addresses for loaded libraries and thus bypass ASLR for a setuid
1084 program. Reported by Marcin Kościelnicki.
1086 The following bugs are resolved with this release:
1088 [12031] localedata: iconv -t ascii//translit with Greek characters
1089 [15813] libc: Multiple issues in __gen_tempname
1090 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1091 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1092 [19767] libc: vdso is not used with static linking
1093 [19903] hurd: Shared mappings not being inherited by children processes
1094 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1095 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1097 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1098 Symbols-A/B Unicode blocks
1099 [23518] libc: Eliminate __libc_utmp_jump_table
1100 [24026] malloc: malloc_info() returns wrong numbers
1101 [24054] localedata: Many locales are missing date_fmt
1102 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1103 [24304] dynamic-link: Lazy binding failure during ELF
1104 constructors/destructors is not fatal
1105 [24376] libc: RISC-V symbol size confusion with _start
1106 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1108 [24824] libc: test-in-container does not install charmap files compatible
1110 [24844] regex: regex bad pointer / leakage if malloc fails
1111 [24867] malloc: Unintended malloc_info formatting changes
1112 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1113 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1114 [24882] libc: login: pututline uses potentially outdated cache
1115 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1116 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1118 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1120 [24930] dynamic-link: dlopen of PIE executable can result in
1121 _dl_allocate_tls_init assertion failure
1122 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1123 (stringop-overflow error)
1124 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1125 functions other can lead to crashes
1126 [24967] libc: jemalloc static linking causes runtime failure
1127 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1129 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1130 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1131 [25097] libc: new -Warray-bounds with GCC 10
1132 [25112] dynamic-link: dlopen must not make new objects accessible when it
1133 still can fail with an error
1134 [25139] localedata: Please add the new mnw_MM locale
1135 [25149] regex: Array bounds violation in proceed_next_node
1136 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1137 initialized correctly
1138 [25189] libc: glibc's __glibc_has_include causes issues with clang
1140 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1141 value to an unsigned
1142 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1143 binaries (CVE-2019-19126)
1144 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1146 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1148 [25232] string: <string.h> does not enable const correctness for strchr et
1150 [25233] localedata: Consider "." as the thousands separator for sl_SI
1152 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1153 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1154 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1156 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1157 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1159 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1160 (dl_initfirst) link map pointer
1161 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1162 [25423] libc: Array overflow in backtrace on powerpc
1163 [25425] network: Missing call to __resolv_context_put in
1164 getaddrinfo.c:gethosts
1171 * Unicode 12.1.0 Support: Character encoding, character type info, and
1172 transliteration tables are all updated to Unicode 12.1.0, using
1173 generator scripts contributed by Mike FABIAN (Red Hat).
1175 * The dynamic linker accepts the --preload argument to preload shared
1176 objects, in addition to the LD_PRELOAD environment variable.
1178 * The twalk_r function has been added. It is similar to the existing
1179 twalk function, but it passes an additional caller-supplied argument
1180 to the callback function.
1182 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1184 * Minguo (Republic of China) calendar support has been added as an
1185 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1188 * The entry for the new Japanese era has been added for ja_JP locale.
1190 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1191 pvalloc, memalign, and posix_memalign fail now with total object size
1192 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1193 pointer subtraction within the allocated object, where results might
1194 overflow the ptrdiff_t type.
1196 * The dynamic linker no longer refuses to load objects which reference
1197 versioned symbols whose implementation has moved to a different soname
1198 since the object has been linked. The old error message, symbol
1199 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1200 link time reference, is gone.
1202 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1203 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1204 functions. These behave similarly to their "timed" equivalents, but also
1205 accept a clockid_t parameter to determine which clock their timeout should
1206 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1207 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1208 time of the wait (unlike with pthread_condattr_setclock, which requires
1209 the clock choice at initialization time).
1211 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1212 work, new resolvers can use a second argument which can be extended in
1213 the future, currently it contains the AT_HWCAP2 value.
1215 Deprecated and removed features, and other changes affecting compatibility:
1217 * The copy_file_range function fails with ENOSYS if the kernel does not
1218 support the system call of the same name. Previously, user space
1219 emulation was performed, but its behavior did not match the kernel
1220 behavior, which was deemed too confusing. Applications which use the
1221 copy_file_range function can no longer rely on glibc to provide a fallback
1222 on kernels that do not support the copy_file_range system call, and if
1223 this function returns ENOSYS, they will need to use their own fallback.
1224 Support for copy_file_range for most architectures was added in version
1225 4.5 of the mainline Linux kernel.
1227 * The functions clock_gettime, clock_getres, clock_settime,
1228 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1229 for new applications (on architectures which had them). Instead, the
1230 definitions in libc will be used automatically, which have been available
1233 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1234 and <sys/stropts.h> have been removed.
1236 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1237 resolver flag (deprecated in glibc 2.25) have been removed.
1239 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1240 resolver have been removed from <resolv.h>.
1242 * With --enable-bind-now, installed programs are now linked with the
1245 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1246 configurations) has been removed, following the deprecation of this
1247 subarchitecture in version 8 of GCC, and its removal in version 9.
1249 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1250 header have been removed.
1252 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1253 deprecated and will be removed from a future version of glibc.
1254 Application should directly access /proc instead. For obtaining random
1255 bits, the getentropy function can be used.
1257 Changes to build and runtime requirements:
1259 * GCC 6.2 or later is required to build the GNU C Library.
1261 Older GCC versions and non-GNU compilers are still supported when
1262 compiling programs that use the GNU C Library.
1264 Security related changes:
1266 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1267 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1268 has undefined behavior. On x32, the size_t argument may be passed
1269 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1270 32 bits. When it happened with the sign bit of RDX register set,
1271 memcmp gave the wrong result since it treated the size argument as
1272 zero. Reported by H.J. Lu.
1274 CVE-2019-9169: Attempted case-insensitive regular-expression match
1275 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1276 over-read. Reported by Hongxu Chen.
1278 The following bugs are resolved with this release:
1280 [2872] locale: Transliteration Cyrillic -> ASCII fails
1281 [6399] libc: gettid() should have a wrapper
1282 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1283 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1284 [17396] localedata: globbing for locale by [[.collating-element.]]
1285 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1286 [18465] malloc: memusagestat is built using system C library
1287 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1288 invalid input drops valid char
1289 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1290 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1291 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1292 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1293 [23352] malloc: __malloc_check_init still defined in public header
1295 [23403] nptl: Wrong alignment of TLS variables
1296 [23501] libc: nftw() doesn't return dangling symlink's inode
1297 [23733] malloc: Check the count before calling tcache_get()
1298 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1300 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1301 [23844] nptl: pthread_rwlock_trywrlock results in hang
1302 [23983] argparse: Missing compat versions of argp_failure and argp_error
1303 for long double = double
1304 [23984] libc: Missing compat versions of err.h and error.h functions for
1305 long double = double
1306 [23996] localedata: Dutch salutations
1307 [24040] libc: riscv64: unterminated call chain in __thread_start
1308 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1310 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1311 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1313 [24114] regex: regexec buffer read overrun in "grep -i
1314 '\(\(\)*.\)*\(\)\(\)\1'"
1315 [24122] libc: Segfaults if 0 returned from la_version
1316 [24153] stdio: Some input functions do not react to stdin assignment
1317 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1318 RDX is set) (CVE-2019-7309)
1319 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1320 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1321 not the default "nor"
1322 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1323 false positives, change to modern flexible array
1324 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1325 instructions while maintaining the robust mutex list due to missing
1327 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1328 unnecessary librt dependencies
1329 [24200] localedata: Revert first_weekday removal in en_IE locale
1330 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1331 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1332 [24216] malloc: Check for large bin list corruption when inserting
1334 [24228] stdio: old x86 applications that use legacy libio crash on exit
1335 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1337 [24293] localedata: Missing Minguo calendar support for TW locales
1338 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1339 tt_RU (Tatar) locale
1340 [24307] localedata: Update locale data to Unicode 12.0.0
1341 [24323] dynamic-link: dlopen should not be able open PIE objects
1342 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1343 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1344 tt_RU (Tatar) locale
1345 [24370] localedata: Add lang_name for tt_RU locale
1346 [24372] locale: Binary locale files are not architecture independent
1347 [24394] time: strptime %Ey mis-parses final year of era
1348 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1350 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1352 [24531] malloc: Malloc tunables give tcache assertion failures
1353 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1355 [24535] localedata: Update locale data to Unicode 12.1.0
1356 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1357 kernels and break testing
1358 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1359 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1360 [-Werror=format-overflow=]
1361 [24570] libc: alpha: compat msgctl uses __IPC_64
1362 [24584] locale: Data race in __wcsmbs_clone_conv
1363 [24588] stdio: Remove codecvt vtables from libio
1364 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1366 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1367 [24632] stdio: Old binaries which use freopen with default stdio handles
1369 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1371 [24652] localedata: szl_PL spelling correction
1372 [24695] nss: nss_db: calling getpwent after endpwent crashes
1373 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1374 in /etc/nsswitch.conf
1375 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1376 [24740] libc: getdents64 type confusion
1377 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1378 always implemented in the same library
1379 [24744] libc: Remove copy_file_range emulation
1380 [24757] malloc: memusagestat is linked against system libpthread
1381 [24794] libc: Partial test suite run builds corrupt test-in-container
1389 * The getcpu wrapper function has been added, which returns the currently
1390 used CPU and NUMA node. This function is Linux-specific.
1392 * A new convenience target has been added for distribution maintainers
1393 to build and install all locales as directories with files. The new
1394 target is run by issuing the following command in your build tree:
1395 'make localedata/install-locale-files', with an optional DESTDIR
1396 to set the install root if you wish to install into a non-default
1397 configured location.
1399 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1401 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1402 for _GNU_SOURCE, to match BSD environments.
1404 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1405 indicates that it will abort the transaction prior to entering the kernel
1406 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1407 suspended, and this caused some undefined side-effects issues by aborting
1408 transactions manually. Glibc avoided it by abort transactions manually on
1409 each syscall, but it lead to performance issues on newer kernels where the
1410 HTM state is saved and restore lazily (the state being saved even when the
1411 process actually does not use HTM).
1413 * The functions posix_spawn_file_actions_addchdir_np and
1414 posix_spawn_file_actions_addfchdir_np have been added, enabling
1415 posix_spawn and posix_spawnp to run the new process in a different
1416 directory. These functions are GNU extensions. The function
1417 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1420 * The popen and system do not run atfork handlers anymore (BZ#17490).
1421 Although it is a possible POSIX violation, the POSIX rationale in
1422 pthread_atfork documentation regarding atfork handlers is to handle
1423 inconsistent mutex state after a fork call in a multi-threaded process.
1424 In both popen and system there is no direct access to user-defined mutexes.
1426 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1427 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1429 - C-SKY ABIV2 soft-float little-endian
1430 - C-SKY ABIV2 hard-float little-endian
1432 * strftime's default formatting of a locale's alternative year (%Ey)
1433 has been changed to zero-pad the year to a minimum of two digits,
1434 like "%y". This improves the display of Japanese era years during
1435 the first nine years of a new era, and is expected to be harmless
1436 for all other locales (only Japanese locales regularly have
1437 alternative year numbers less than 10). Zero-padding can be
1438 overridden with the '_' or '-' flags (which are GNU extensions).
1440 * As a GNU extension, the '_' and '-' flags can now be applied to
1441 "%EY" to control how the year number is formatted; they have the
1442 same effect that they would on "%Ey".
1444 Deprecated and removed features, and other changes affecting compatibility:
1446 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1447 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1449 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1450 in <sys/procfs.h>, has been corrected to match the type actually used by
1451 the Linux kernel. This affects the size and layout of that structure on
1452 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1454 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1455 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1456 defined in <sys/procfs.h>, has been corrected to match the type actually
1457 used by the Linux kernel. This affects the size and layout of those
1460 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1461 meant to scan a string and allocate space for it with malloc, is now
1462 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1463 defined. This extension conflicts with C99's use of '%a' to scan a
1464 hexadecimal floating-point number, which is now available to programs
1465 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1467 POSIX.1-2008 includes the feature of allocating a buffer for string input
1468 with malloc, using the modifier letter 'm' instead. Programs using
1469 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1470 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1471 C99 '%a' no longer need to avoid _GNU_SOURCE.
1473 GCC's -Wformat warnings can detect most uses of this extension, as long
1474 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1475 __attribute__ ((format (scanf, ...))).
1477 Changes to build and runtime requirements:
1479 * Python 3.4 or later is required to build the GNU C Library.
1481 * On most architectures, GCC 5 or later is required to build the GNU C
1482 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1484 Older GCC versions and non-GNU compilers are still supported when
1485 compiling programs that use the GNU C Library.
1487 Security related changes:
1489 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1490 denial of service due to resource exhaustion when processing getaddrinfo
1491 calls with crafted host names. Reported by Guido Vranken.
1493 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1494 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1495 happened, accessing the 32-bit size_t value as the full 64-bit register
1496 in the assembly string/memory functions would cause a buffer overflow.
1497 Reported by H.J. Lu.
1499 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1500 addresses with arbitrary trailing characters, potentially leading to data
1501 or command injection issues in applications.
1503 The following bugs are resolved with this release:
1505 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1506 [10496] localedata: 12h time representation in multiple locales faulty
1507 [10797] localedata: it_IT locale numeric does not have a separator for
1509 [11319] libc: dprintf doesn't handle errors properly
1510 [16346] time: mktime: potentially unsafe use of localtime_offset
1511 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1513 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1514 posix_spawn_file_actions_addfchdir_np
1515 [17426] localedata: Indian locales: set the correct date format
1516 [17490] stdio: popen should not invoke atfork handlers
1517 [17783] libc: TIOCSER_TEMT conditions inconsistent
1518 [18040] regex: use-after-free in regexec/get_subexp
1519 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1520 [20018] network: getaddrinfo should reject IP addresses with trailing
1521 characters (CVE-2016-10739)
1522 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1523 [20271] libc: Missing "\n" in __libc_fatal calls
1524 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1525 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1526 pointer argument is non-NULL
1527 [21037] stdio: open_memstream and freopen
1528 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1529 [21716] time: Crash in glibc's mktime in low-memory situations
1530 [22834] stdio: Subprocess forked by popen may crash in Linux when
1531 multithreads call popen
1532 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1533 and pthread_create fails.
1534 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1535 [23125] libc: riscv64: endless loop when throwing an exception from a
1537 [23275] nptl: Race in pthread_mutex_lock while promoting to
1538 PTHREAD_MUTEX_ELISION_NP.
1539 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1541 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1543 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1545 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1546 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1548 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1549 [23521] nss: get_next_alias nss_files file stream leak
1550 [23538] nptl: Hang in pthread_cond_broadcast
1551 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1552 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1553 [23579] libc: Errors misreported in preadv2
1554 [23597] build: support/test-container.c doesn't work with different
1556 [23603] time: mktime signed integer overflow on large timestamps
1557 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1558 [23614] libc: powerpc: missing CFI register information in __mpn_*
1560 [23637] string: Generic strstr/strcasestr fails with huge needles
1561 [23640] libc: no way to easily clear FD_CLOEXEC in
1562 posix_spawn_file_actions_adddup2()
1563 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1565 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1567 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1568 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1569 bits/types/struct_rusage.h
1570 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1572 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1574 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1575 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1576 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1578 [23724] localedata: Albanian date formats are incorrect
1579 [23735] math: libnldbl_nonshared.a references internal libm symbols
1580 [23740] localedata: kl_GL: Month names and date formats need update
1581 [23744] regex: regex refactorings to remove BE, avoid duplication
1582 [23745] time: mktime fix for Gnulib + coreutils
1583 [23758] time: Improve the width of alternate representation for year in
1585 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1586 [23789] time: mktime does not set errno on failure
1587 [23791] localedata: Wrong monetary format for ca_ES locale
1588 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1589 [23794] locale: c16rtomb does not handle surrogate pairs
1590 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1591 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1592 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1593 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1594 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1595 [23862] libc: [sh] missing kernel-features.h undefines
1596 [23864] libc: [riscv] missing kernel-features.h undefines
1597 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1598 [23907] malloc: Incorrect double-free malloc tcache check disregards
1600 [23913] libc: off-by-one in function maybe_script_execute in
1601 sysdeps/posix/spawni.c
1602 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1603 [23923] locale: Add --no-hard-links option to localedef
1604 [23927] network: Linux if_nametoindex() does not close descriptor
1606 [23961] math: powf can overflow to inf without setting errno in non-
1607 nearest rounding mode
1608 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1609 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1610 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1611 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1612 [24011] localedata: Fixed small type in comment for locale bs_BA
1613 [24018] libc: gettext() may return NULL
1614 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1615 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1616 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1618 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1619 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1621 [24046] localedata: en_US locale doesn't define date_fmt
1622 [24063] manual: @var{errno} should be @code{errno}
1623 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1624 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1626 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1628 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1630 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1632 [24112] network: Do not send DNS queries for non-host names (where all
1633 answers will be rejected)
1634 [24130] libc: alpha __remqu corrupts $f3 register
1641 * The localization data for ISO 14651 is updated to match the 2016
1642 Edition 4 release of the standard, this matches data provided by
1643 Unicode 9.0.0. This update introduces significant improvements to the
1644 collation of Unicode characters. This release deviates slightly from
1645 the standard in that the collation element ordering for lowercase and
1646 uppercase LATIN script characters is adjusted to ensure that regular
1647 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1648 is not matched by [a-z]. With the update many locales have been
1649 updated to take advantage of the new collation information. The new
1650 collation information has increased the size of the compiled locale
1651 archive or binary locales.
1653 * The GNU C Library can now be compiled with support for Intel CET, AKA
1654 Intel Control-flow Enforcement Technology. When the library is built
1655 with --enable-cet, the resulting glibc is protected with indirect
1656 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1657 compatible with all existing executables and shared libraries. This
1658 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1659 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1660 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1661 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1662 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1663 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1666 * The GNU C Library now has correct support for ABSOLUTE symbols
1667 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1668 relocated incorrectly or in some cases discarded. The GNU linker can
1669 make use of the newer semantics, but it must communicate it to the
1670 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1671 field) to indicate such support is required.
1673 * Unicode 11.0.0 Support: Character encoding, character type info, and
1674 transliteration tables are all updated to Unicode 11.0.0, using
1675 generator scripts contributed by Mike FABIAN (Red Hat).
1677 * <math.h> functions that round their results to a narrower type are added
1678 from TS 18661-1:2014 and TS 18661-3:2015:
1680 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1681 fMxaddfNx functions.
1683 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1684 fMxsubfNx functions.
1686 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1687 fMxmulfNx functions.
1689 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1690 fMxdivfNx functions.
1692 * Two grammatical forms of month names are now supported for the following
1693 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1694 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1695 support two grammatical forms in abbreviated month names: Catalan, Greek,
1698 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1699 include the support for two grammatical forms of month names.
1701 * Building and running on GNU/Hurd systems now works without out-of-tree
1704 * The renameat2 function has been added, a variant of the renameat function
1705 which has a flags argument. If the flags are zero, the renameat2 function
1706 acts like renameat. If the flag is not zero and there is no kernel
1707 support for renameat2, the function will fail with an errno value of
1708 EINVAL. This is different from the existing gnulib function renameatu,
1709 which performs a plain rename operation in case of a RENAME_NOREPLACE
1710 flags and a non-existing destination (and therefore has a race condition
1711 that can clobber the destination inadvertently).
1713 * The statx function has been added, a variant of the fstatat64
1714 function with an additional flags argument. If there is no direct
1715 kernel support for statx, glibc provides basic stat support based on
1716 the fstatat64 function.
1718 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1719 library if installed. libidn2 version 2.0.5 or later is recommended. If
1720 libidn2 is not available, internationalized domain names are not encoded
1721 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1722 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1723 with an encoding error.) Flags which used to change the IDN encoding and
1724 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1725 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1726 deprecated. They no longer have any effect.
1728 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1729 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1730 range of ELF gABI expressions including such constructs as
1731 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1732 have been further restricted, and where in the past a dynamic string
1733 token sequence may have been interpreted as a literal string it will
1734 now cause a load failure. These load failures were always considered
1735 unspecified behaviour from the perspective of the dynamic loader, and
1736 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1737 results in a load failure now.
1739 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1740 implementation includes all the standard functions provided by
1743 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1744 thrd_detach, thrd_exit, and thrd_join for thread management.
1746 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1747 mtx_destroy for mutual exclusion.
1749 - call_once for function call synchronization.
1751 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1752 cnd_wait for conditional variables.
1754 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1756 Application developers must link against libpthread to use ISO C threads.
1758 Deprecated and removed features, and other changes affecting compatibility:
1760 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1761 installed. Software that was using either header should be updated to
1762 use standard <stdio.h> interfaces instead.
1764 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1765 This was never required by the C standard, and the macros just expanded
1766 to call alternative names for the same functions. If you hoped getc and
1767 putc would provide performance improvements over fgetc and fputc, instead
1768 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1769 necessary, flockfile and funlockfile.
1771 * All stdio functions now treat end-of-file as a sticky condition. If you
1772 read from a file until EOF, and then the file is enlarged by another
1773 process, you must call clearerr or another function with the same effect
1774 (e.g. fseek, rewind) before you can read the additional data. This
1775 corrects a longstanding C99 conformance bug. It is most likely to affect
1776 programs that use stdio to read interactive input from a terminal.
1779 * The macros 'major', 'minor', and 'makedev' are now only available from
1780 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1781 headers that happen to include <sys/types.h>. These macros are rarely
1782 used, not part of POSIX nor XSI, and their names frequently collide with
1783 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1784 further explanation.
1786 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1787 these macros should first include <sys/types.h>, and then include
1788 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1790 * The tilegx*-*-linux-gnu configurations are no longer supported.
1792 * The obsolete function ustat is no longer available to newly linked
1793 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1794 function has been deprecated in favor of fstatfs and statfs.
1796 * The obsolete function nfsservctl is no longer available to newly linked
1797 binaries. This function was specific to systems using the Linux kernel
1798 and could not usefully be used with the GNU C Library on systems with
1799 version 3.1 or later of the Linux kernel.
1801 * The obsolete function name llseek is no longer available to newly linked
1802 binaries. This function was specific to systems using the Linux kernel
1803 and was not declared in a header. Programs should use the lseek64 name
1804 for this function instead.
1806 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1807 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1808 previously selected by them is now always enabled.
1810 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1811 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1812 restriction (rejecting '_' in host names, among other things) has been
1813 removed, for increased compatibility with non-IDN name resolution.
1815 * The fcntl function now have a Long File Support variant named fcntl64. It
1816 is added to fix some Linux Open File Description (OFD) locks usage on non
1817 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1818 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1819 locks act as a cancellation entrypoint.
1821 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1822 ecb_crypt, and des_setparity are no longer available to newly linked
1823 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1824 longer installed. These functions encrypted and decrypted data with the
1825 DES block cipher, which is no longer considered secure. Software that
1826 still uses these functions should switch to a modern cryptography library,
1829 * Reflecting the removal of the encrypt and setkey functions above, the
1830 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1831 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1834 * The obsolete function fcrypt is no longer available to newly linked
1835 binaries. It was just another name for the standard function crypt,
1836 and it has not appeared in any header file in many years.
1838 * We have tentative plans to hand off maintenance of the passphrase-hashing
1839 library, libcrypt, to a separate development project that will, we hope,
1840 keep up better with new passphrase-hashing algorithms. We will continue
1841 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1842 'crypt_r' should not need to change at all; however, distributions will
1843 need to install <crypt.h> and libcrypt from a separate project.
1845 In this release, if the configure option --disable-crypt is used, glibc
1846 will not install <crypt.h> or libcrypt, making room for the separate
1847 project's versions of these files. The plan is to make this the default
1848 behavior in a future release.
1850 Changes to build and runtime requirements:
1852 GNU make 4.0 or later is now required to build glibc.
1854 Security related changes:
1856 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1857 been fixed by removing the glibc-internal IDNA implementation and using
1858 the system-provided libidn2 library instead. Originally reported by Hanno
1859 Böck and Christian Weisgerber.
1861 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1862 architecture could corrupt memory. Reported by Max Horn.
1864 CVE-2018-11236: Very long pathname arguments to realpath function could
1865 result in an integer overflow and buffer overflow. Reported by Alexey
1868 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1869 architecture could write beyond the target buffer, resulting in a buffer
1870 overflow. Reported by Andreas Schwab.
1872 The following bugs are resolved with this release:
1874 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1875 [6889] manual: 'PWD' mentioned but not specified
1876 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1877 when __WORDSIZE != 64
1878 [13762] regex: re_search etc. should return -2 on memory exhaustion
1879 [13888] build: /tmp usage during testing
1880 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1881 [14092] nptl: Support C11 threads
1882 [14095] localedata: Review / update collation data from Unicode / ISO
1884 [14508] libc: -Wformat warnings
1885 [14553] libc: Namespace pollution loff_t in sys/types.h
1886 [14890] libc: Make NT_PRFPREG canonical.
1887 [15105] libc: Extra PLT references with -Os
1888 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1890 [16335] manual: Feature test macro documentation incomplete and out of
1892 [16552] libc: Unify umount implementations in terms of umount2
1893 [17082] libc: htons et al.: statement-expressions prevent use on global
1894 scope with -O1 and higher
1895 [17343] libc: Signed integer overflow in /stdlib/random_r.c
1896 [17438] localedata: pt_BR: wrong d_fmt delimiter
1897 [17662] libc: please implement binding for the new renameat2 syscall
1898 [17721] libc: __restrict defined as /* Ignore */ even in c11
1899 [17979] libc: inconsistency between uchar.h and stdint.h
1900 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
1901 [18023] libc: extend_alloca is broken (questionable pointer comparison,
1902 horrible machine code)
1903 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
1905 [18471] libc: llseek should be a compat symbol
1906 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
1908 [18991] nss: nss_files skips large entry in database
1909 [19239] libc: Including stdlib.h ends up with macros major and minor being
1911 [19463] libc: linknamespace failures when compiled with -Os
1912 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
1913 [19527] locale: Normalized charset name not recognized by setlocale
1914 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
1915 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
1917 [19728] network: out of bounds stack read in libidn function
1918 idna_to_ascii_4i (CVE-2016-6261)
1919 [19729] network: out of bounds heap read on invalid utf-8 inputs in
1920 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
1921 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
1923 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
1924 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
1925 [20419] dynamic-link: files with large allocated notes crash in
1927 [20530] libc: bswap_16 should use __builtin_bswap16() when available
1928 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
1929 [20980] manual: CFLAGS environment variable replaces vital options
1930 [21163] regex: Assertion failure in pop_fail_stack when executing a
1931 malformed regexp (CVE-2015-8985)
1932 [21234] manual: use of CFLAGS makes glibc detect no optimization
1933 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
1934 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
1935 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
1936 [21508] locale: intl/tst-gettext failure with latest msgfmt
1937 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
1938 [21812] network: getifaddrs() returns entries with ifa_name == NULL
1939 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
1941 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
1943 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
1944 [22247] network: Integer overflow in the decode_digit function in
1945 puny_decode.c in libidn (CVE-2017-14062)
1946 [22342] nscd: NSCD not properly caching netgroup
1947 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
1948 [22550] localedata: es_ES locale (and other es_* locales): collation
1949 should treat ñ as a primary different character, sync the collation
1950 for Spanish with CLDR
1951 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
1952 by gcc configured with --enable-default-pie
1953 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
1954 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
1955 crossing 2GB threshold (CVE-2017-18269)
1956 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
1958 [22735] time: Misleading typo in time.h source comment regarding
1960 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
1961 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
1962 `__assert_perror_fail ()' to `__assert_fail_base ()'
1963 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
1965 [22786] libc: Stack buffer overflow in realpath() if input size is close
1966 to SSIZE_MAX (CVE-2018-11236)
1967 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
1968 through an absolute DT_NEEDED path
1969 [22792] build: tcb-offsets.h dependency dropped
1970 [22797] libc: pkey_get() uses non-reserved name of argument
1971 [22807] libc: PTRACE_* constants missing for powerpc
1972 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
1973 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
1974 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
1975 [22848] localedata: ca_ES: update date definitions from CLDR
1976 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
1977 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
1978 [22896] localedata: Update locale data for an_ES
1979 [22902] math: float128 test failures with GCC 8
1980 [22918] libc: multiple common of `__nss_shadow_database'
1981 [22919] libc: sparc32: backtrace yields infinite backtrace with
1983 [22926] libc: FTBFS on powerpcspe
1984 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
1986 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
1987 [22947] libc: FAIL: misc/tst-preadvwritev2
1988 [22963] localedata: cs_CZ: Add alternative month names
1989 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
1990 [22996] localedata: change LC_PAPER to en_US in es_BO locale
1991 [22998] dynamic-link: execstack tests are disabled when SELinux is
1993 [23005] network: Crash in __res_context_send after memory allocation
1995 [23007] math: strtod cannot handle -nan
1996 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
1997 [23036] regex: regex equivalence class regression
1998 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
1999 [23069] libc: sigaction broken on riscv64-linux-gnu
2000 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2001 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2002 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2003 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2004 and libc build with -Os)
2005 [23140] localedata: More languages need two forms of month names
2006 [23145] libc: _init/_fini aren't marked as hidden
2007 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2008 [23171] math: C++ iseqsig for long double converts arguments to double
2009 [23178] nscd: sudo will fail when it is run in concurrent with commands
2010 that changes /etc/passwd
2011 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2013 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2014 [23208] localedata: New locale - Lower Sorbian (dsb)
2015 [23233] regex: Memory leak in build_charclass_op function in file
2017 [23236] stdio: Harden function pointers in _IO_str_fields
2018 [23250] nptl: Offset of __private_ss differs from GCC
2019 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2020 -mtune=generic -mfpmath=sse
2021 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2023 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2024 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2026 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2027 [23277] math: nan function should not have const attribute
2028 [23279] math: scanf and strtod wrong for some hex floating-point
2029 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2031 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2032 [23303] build: undefined reference to symbol
2033 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2034 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2036 [23313] stdio: libio vtables validation and standard file object
2038 [23329] libc: The __libc_freeres infrastructure is not properly run across
2040 [23349] libc: Various glibc headers no longer compatible with
2042 [23351] malloc: Remove unused code related to heap dumps and malloc
2044 [23363] stdio: stdio-common/tst-printf.c has non-free license
2045 [23396] regex: Regex equivalence regression in single-byte locales
2046 [23422] localedata: oc_FR: More updates of locale data
2047 [23442] build: New warning with GCC 8
2048 [23448] libc: Out of bounds access in IBM-1390 converter
2049 [23456] libc: Wrong index_cpu_LZCNT
2050 [23458] build: tst-get-cpu-features-static isn't added to tests
2051 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2053 [23467] dynamic-link: x86/CET: A property note parser bug
2060 * The GNU C Library can now be compiled with support for building static
2061 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2062 executables are like static executables but can be loaded at any address
2063 and provide additional security hardening benefits at the cost of some
2064 memory and performance. When the library is built with --enable-static-pie
2065 the resulting libc.a is usable with GCC 8 and above to create static PIE
2066 executables using the GCC option '-static-pie'. This feature is currently
2067 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2068 aarch64 with binutils 2.30 or later.
2070 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2071 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2074 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2076 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2078 * In order to support faster and safer process termination the malloc API
2079 family of functions will no longer print a failure address and stack
2080 backtrace after detecting heap corruption. The goal is to minimize the
2081 amount of work done after corruption is detected and to avoid potential
2082 security issues in continued process execution. Reducing shutdown time
2083 leads to lower overall process restart latency, so there is benefit both
2084 from a security and performance perspective.
2086 * The abort function terminates the process immediately, without flushing
2087 stdio streams. Previous glibc versions used to flush streams, resulting
2088 in deadlocks and further data corruption. This change also affects
2089 process aborts as the result of assertion failures.
2091 * On platforms where long double has the IEEE binary128 format (aarch64,
2092 alpha, mips64, riscv, s390 and sparc), the math library now implements
2093 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2094 These are the same interfaces added in version 2.26 for some platforms where
2095 this format is supported but is not the format of long double.
2097 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2098 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2099 implements interfaces for that type, as defined by ISO/IEC TS
2100 18661-3:2015. These are corresponding interfaces to those supported for
2103 * The math library now implements interfaces for the _Float32, _Float64 and
2104 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2105 corresponding interfaces to those supported for _Float128.
2107 * glibc now implements the memfd_create and mlock2 functions on Linux.
2109 * Support for memory protection keys was added. The <sys/mman.h> header now
2110 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2113 * The copy_file_range function was added.
2115 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2117 * The ldconfig utility now processes `include' directives using the C/POSIX
2118 collation ordering. Previous glibc versions used locale-specific
2119 ordering, the change might break systems that relied on that.
2121 * Support for two grammatical forms of month names has been added.
2122 In a call to strftime, the "%B" and "%b" format specifiers will now
2123 produce the grammatical form required when the month is used as part
2124 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2125 required when the month is named by itself. For instance, in Greek
2126 and in many Slavic and Baltic languages, "%B" will produce the month
2127 in genitive case, and "%OB" will produce the month in nominative case.
2129 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2130 are all valid and will all accept any known form of month
2131 name---standalone or complete, abbreviated or full. In a call to
2132 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2133 the strings used by "%B" and "%b", respectively. New query
2134 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2135 used by "%OB" and "%Ob", respectively.
2137 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2138 define the strings for %OB and %Ob, respectively; these have the
2139 same syntax as "mon" and "abmon". These arrays are optional; if they
2140 are not provided then they have the same content as "mon" and "abmon",
2143 These features are provided for locales which define "alt_mon" and/or
2144 "ab_alt_mon" in their locale source data. This release includes such
2145 alternative month name data for the following languages: Belarusian,
2146 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2148 This feature is currently a GNU extension, but it is expected to
2149 be added to the next revision of POSIX, and it is also already
2150 available on some BSD-derived operating systems.
2152 This feature will cause existing statically compiled applications
2153 to fail to load locales and fall back to the builtin C/POSIX locales.
2154 See notes below for other changes affecting compatibility.
2156 * Support for the RISC-V ISA running on Linux has been added. This port
2157 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2158 for the following ISA and ABI pairs:
2164 Deprecated and removed features, and other changes affecting compatibility:
2166 * Statically compiled applications attempting to load locales compiled for the
2167 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2168 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2169 support for two grammatical forms of the month names, also extends the locale
2170 data binary format. Static applications needing locale support must be
2171 recompiled to match the runtime and data they are deployed with. In some
2172 distributions there is an upgrade window where dynamically linked applications
2173 may use a new library but the old locale data and also fall back to the
2174 builtin C/POSIX locales; restarting the application process is sufficient to
2177 * Support for statically linked applications which call dlopen is deprecated
2178 and will be removed in a future version of glibc. Applications which call
2179 dlopen need to be linked dynamically instead.
2181 * Support for old programs which use internal stdio data structures and
2182 functions is deprecated. This includes programs which use the C++ streams
2183 provided by libstdc++ in GCC 2.95. Programs which use the internal
2184 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2185 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2186 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2187 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2188 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2189 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2190 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2191 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2192 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2193 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2194 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2195 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2196 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2197 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2198 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2199 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2200 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2201 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2202 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2203 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2204 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2205 future version of glibc. Unlike other symbol removals, these old
2206 applications will not be supported using compatibility symbols.
2208 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2209 defined by <sys/ptrace.h>.
2211 * libm no longer supports SVID error handling (calling a user-provided
2212 matherr function on error) or the _LIB_VERSION variable to control error
2213 handling. (SVID error handling and the _LIB_VERSION variable still work
2214 for binaries linked against older versions of the GNU C Library.) The
2215 libieee.a library is no longer provided. math.h no longer defines struct
2216 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2217 TLOSS, PLOSS and HUGE.
2219 * The libm functions pow10, pow10f and pow10l are no longer supported for
2220 new programs. Programs should use the standard names exp10, exp10f and
2221 exp10l for these functions instead.
2223 * The mcontext_t type is no longer the same as struct sigcontext. On
2224 platforms where it was previously the same, this changes the C++ name
2225 mangling for interfaces involving this type.
2227 * The add-ons mechanism for building additional packages at the same time as
2228 glibc has been removed. The --enable-add-ons configure option is now
2231 * The --without-fp configure option is now ignored. Whether hardware
2232 floating-point instructions are used is now configured based on whether
2233 the compiler used at configure time (without any options implied by a
2234 --with-cpu= configure option) uses such instructions.
2236 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2237 the specified string can be parsed as a domain name.
2239 * In the malloc_info output, the <heap> element may contain another <aspace>
2240 element, "subheaps", which contains the number of sub-heaps.
2242 * The libresolv function p_secstodate is no longer supported for new
2245 * The tilepro-*-linux-gnu configuration is no longer supported.
2247 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2248 and will be removed in a future release. Software that is still using
2249 either header should be updated to use standard <stdio.h> interfaces
2252 libio.h was originally the header for a set of supported GNU extensions,
2253 but they have not been maintained as such in many years, they are now
2254 standing in the way of improvements to stdio, and we don't think there are
2255 any remaining external users. _G_config.h was never intended for public
2256 use, but predates the bits convention.
2258 Changes to build and runtime requirements:
2260 * bison version 2.7 or later is required to generate code in the 'intl'
2263 Security related changes:
2265 CVE-2009-5064: The ldd script would sometimes run the program under
2266 examination directly, without preventing code execution through the
2267 dynamic linker. (The glibc project disputes that this is a security
2268 vulnerability; only trusted binaries must be examined using the ldd
2271 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2272 suffered from a one-byte overflow during ~ operator processing (either
2273 on the stack or the heap, depending on the length of the user name).
2274 Reported by Tim Rühsen.
2276 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2277 would sometimes fail to free memory allocated during ~ operator
2278 processing, leading to a memory leak and, potentially, to a denial
2281 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2282 without GLOB_NOESCAPE, could write past the end of a buffer while
2283 unescaping user names. Reported by Tim Rühsen.
2285 CVE-2017-17426: The malloc function, when called with an object size near
2286 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2287 instead of NULL. This was a regression introduced with the new malloc
2288 thread cache in glibc 2.26. Reported by Iain Buclaw.
2290 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2291 to the allocation of too much memory. (This is not a security bug per se,
2292 it is mentioned here only because of the CVE assignment.) Reported by
2295 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2296 of the number of search path components. (This is not a security
2297 vulnerability per se because no trust boundary is crossed if the fix for
2298 CVE-2017-1000366 has been applied, but it is mentioned here only because
2299 of the CVE assignment.) Reported by Qualys.
2301 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2302 for AT_SECURE or SUID binaries could be used to load libraries from the
2305 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2306 succeeds without returning an absolute path due to unexpected behaviour
2307 of the Linux kernel getcwd syscall. Reported by halfdog.
2309 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2310 an object size near the value of SIZE_MAX, would return a pointer to a
2311 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2313 CVE-2018-6551: The malloc function, when called with an object size near
2314 the value of SIZE_MAX, would return a pointer to a buffer which is too
2315 small, instead of NULL.
2317 The following bugs are resolved with this release:
2319 [866] glob: glob should match dangling symlinks
2320 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2321 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2323 [5997] math: Very slow execution of sinf function
2324 [10580] localedata: hr_HR: updated locale
2325 [10871] locale: 'mon' array should contain both nominative and genitive
2327 [12349] localedata: eu_ES: incorrect thousands separator
2328 [13605] localedata: shn_MM: new Shan locale
2329 [13805] localedata: ru_RU: currency should use ',' as radix point
2330 [13953] localedata: km_KH: locale update
2331 [13994] localedata: mjw_IN: new locale
2332 [14121] build: make writes .mo files in po directory
2333 [14333] libc: Fix the race between atexit() and exit()
2334 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2335 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2337 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2338 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2339 width Latin characters
2340 [15332] localedata: es_CU: locale update
2341 [15436] stdio: Don't close or flush stdio streams on abort
2342 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2344 [16148] localedata: ca_ES: incorrect thousands separator
2345 [16750] dynamic-link: ldd should not try to execute the binaries
2347 [16777] localedata: pl_PL: incorrect thousands separator in locale
2348 [16905] localedata: hanzi: new collation
2349 [17563] localedata: cmn_TW: add hanzi collation
2350 [17750] localedata: wrong collation order of diacritics in most locales
2351 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2353 [17956] build: Build fails on missing definitions from header file
2354 nss/nss.h when Mozilla NSS is used for cryptography
2355 [18203] libc: realpath() does not handle unreachable paths correctly
2356 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2357 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2358 [18822] libc: Internal functions are called via PLT
2359 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2360 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2361 [19574] libc: glibc should support building static PIE binaries
2362 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2364 [19971] glob: glob: Do not skip entries with zero d_ino values
2365 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2366 [20008] localedata: km_KH: convert to translit_neutral
2367 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2368 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2369 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2370 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2371 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2373 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2374 they're set, wrong errors returned by gaih_inet when lookup functions
2376 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2377 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2379 [20952] localedata: yuw_PG: new locale
2380 [21084] localedata: charmaps/IBM858: new codepage
2381 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2382 [21242] libc: assert gives pedantic warning in old gcc versions
2383 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2384 __regcall calling convention
2385 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2386 [21326] libc: C99 functions are not declared for C++11 and later if
2387 _GNU_SOURCE is not predefined by g++
2388 [21457] libc: sys/ucontext.h namespace
2389 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2390 [21660] math: GCC fails to compile a formula with tgmath.h
2391 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2392 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2393 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2394 [21684] math: tgmath.h handling of complex integers
2395 [21685] math: tgmath.h handling of bit-fields
2396 [21686] math: tgmath.h handling of __int128
2397 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2399 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2401 [21750] localedata: column width of characters incompatible with classical
2403 [21754] malloc: malloc: Perform as little work as possible after heap
2404 consistency check failures
2405 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2406 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2407 [21791] string: Unused XXX_chk_XXX functions in libc.a
2408 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2410 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2412 [21845] localedata: Added new Locale bho_NP
2413 [21853] localedata: Fix abday Which looks same as day in zh_SG
2414 [21854] localedata: Added New Locale en_SC
2415 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2416 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2417 _dl_runtime_resolve_avx_slow
2418 [21885] network: getaddrinfo: gethosts does not release resolver context
2419 on memory allocation failure
2420 [21899] libc: XPG4.2 sigaction namespace
2421 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2423 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2425 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2426 errno value, causing getaddrinfo to fail
2427 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2428 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2429 instead of EAI_NODATA
2430 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2431 constant PTRACE_SEIZE_DEVEL
2432 [21930] math: C-only gcc builtins used in <math.h> isinf
2433 [21932] network: Unpaired __resolv_context_get in generic get*_r
2435 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2436 [21944] libc: sigval namespace
2437 [21951] localedata: Update hanzi collation by stroke
2438 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2439 sysdeps/x86_64/fpu/e_expf.S
2440 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2441 allocation in syscall loops)
2442 [21959] localedata: Fix Country name for xh_ZA
2443 [21960] localedata: Fix abmon for bem_ZM
2444 [21966] math: AVX2 mathvec functions use FMA without checking
2445 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2446 [21971] localedata: Added New Locale for mfe_MU
2447 [21972] libc: assert macro requires operator== (int) for its argument type
2448 [21973] math: [sparc] libm missing sqrtl compat symbol
2449 [21974] libc: Remove __bb_init_func and __bb_exit_func
2450 [21982] string: stratcliff.c: error: assuming signed overflow does not
2452 [21986] stdio: __guess_grouping is called incorrectly
2453 [21987] math: [sparc32] wrong bits/long-double.h installed
2454 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2456 [22022] localedata: Missing country_name for mni_IN
2457 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2459 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2461 [22026] locale: iconv_open: heap overflow on gconv_init failure
2462 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2463 [22035] math: [m68k] bits/math-inline.h macro namespace
2464 [22038] localedata: Fix abbreviated weeks and months for Somali
2465 [22044] localedata: Remove redundant data for Limburgish Language
2466 [22050] malloc: Linking with -lmcheck does not hook
2467 __malloc_initialize_hook correctly
2468 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2469 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2470 [22070] localedata: charmaps/UTF-8: wcwidth for
2471 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2472 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2473 Jungseong and Jongseong) should be 0
2474 [22078] nss: nss_files performance issue in multi mode
2475 [22082] math: bits/math-finite.h exp10 condition
2476 [22086] libc: pcprofiledump incorrect cross-endian condition
2477 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2478 [22095] network: Name server address allocation memory leak in resolv.conf
2480 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2482 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2483 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2485 [22111] malloc: malloc: per thread cache is not returned when thread exits
2486 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2487 [22134] libc: [linux] implement fexecve with execveat
2488 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2490 [22145] libc: ttyname() gives up too early in the face of namespaces
2491 [22146] math: C++ build issue with float128 on x86_64
2492 [22153] nptl: nptl: save error code before process termination
2493 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2494 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2495 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2496 [22165] libc: [hppa] Text relocations in libc.so
2497 [22180] libc: destructor registered via __cxa_atexit is called twice
2498 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2499 symlinks") cause "make" segfaults
2500 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2502 [22207] libc: FAIL: stdlib/test-atexit-race
2503 [22225] math: nearbyint arithmetic moved before feholdexcept
2504 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2505 [22235] math: iscanonical in C++ and float128
2506 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2507 the svid compat wrapper
2508 [22244] math: ynf and yn are wrong without the svid compat wrapper
2509 [22273] libc: Improper assert in Linux posix_spawn implementation
2510 [22284] libc: -pg -pie doesn't work
2511 [22292] locale: localedef exits with error 4 when it should be error 1
2512 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2513 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2515 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2516 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2518 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2519 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2520 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2521 [22322] libc: [mips64] wrong bits/long-double.h installed
2522 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2523 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2525 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2526 [22343] malloc: Integer overflow in posix_memalign
2527 [22347] libc: getrandom() returns the number of bytes that were copied to
2528 the buffer even though the comments say "Return 0 on success and -1 on
2530 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2531 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2533 [22370] dynamic-link: Incorrect note padding check
2534 [22375] libc: malloc returns pointer from tcache_get when should return
2535 NULL (CVE-2017-17426)
2536 [22377] math: iseqsig, float128 and C++
2537 [22382] localedata: Error in tpi_PG locale
2538 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2539 inside the ASCII printable range
2540 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2542 [22403] localedata: Slash needs escaping in some locales
2543 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2544 [22409] network: res_hnok does not accept some host names used on the
2546 [22412] network: res_dnok, res_hnok should perform syntax checks
2547 [22413] network: ns_name_pton ignores syntactically invalid trailing
2549 [22415] stdio: setvbuf can lead to invalid free/segfault
2550 [22432] build: Non-deterministic build
2551 [22439] malloc: malloc_info should compute summary statistics for all sub-
2553 [22442] network: if_nametoindex could report index for the wrong
2554 networking interface
2555 [22446] build: aliasing violation calling readlink in handle_request
2556 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2557 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2558 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2559 __nscd_hash/__nss_hash
2560 [22463] network: p_secstodate overflow handling
2561 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2562 [22478] libc: sigwait can fail with EINTR
2563 [22505] libc: ldconfig processes include directive in locale-specific
2565 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2566 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2567 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2568 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2569 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2570 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2571 same as for Croatian
2572 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2573 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2574 [22577] libc: missing newline after "cannot allocate TLS data structures
2576 [22588] manual: manual/conf.texi: missing underscore in front of
2578 [22593] math: nextafter and nexttoward are declared with const attribute
2579 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2580 [22603] string: ia64 memchr overflows internal pointer check
2581 [22605] libc: SH clone does not set the exit code correctly
2582 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2584 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2585 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2586 modified in case of success
2587 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2588 [22615] manual: manual: ambiguous wording about errno value in case of
2590 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2592 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2593 binaries or if /proc is not mounted (CVE-2017-16997)
2594 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2595 [22630] build: $(no-pie-ldflag) is no longer effective
2596 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2597 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2598 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2599 [22637] nptl: guard size is subtracted from thread stack size instead of
2601 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2602 [22657] localedata: hu_HU: Avoid double space in date
2603 [22660] math: fmax, fmin sNaN handling on alpha
2604 [22664] libc: New warning of GCC8
2605 [22665] math: alpha: ceil and floor raise inexact exceptions
2606 [22666] math: alpha: trunc raise inexact exceptions
2607 [22667] libc: makecontext lacks stack alignment on i386
2608 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2609 [22679] libc: getcwd(3) can succeed without returning an absolute path
2611 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2612 elision and tunables
2613 [22687] math: [powerpc-nofpu] complex long double functions spurious
2615 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2616 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2617 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2619 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2620 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2622 [22701] nis: Incomplete removal of libnsl
2623 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2624 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2625 [22715] dynamic-link: FAIL: elf/tst-audit10
2626 [22719] libc: Backtrace tests fail on hppa
2627 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2628 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2629 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2630 before the first call to crypt_r () in crypt/badsalttest.c
2637 * A per-thread cache has been added to malloc. Access to the cache requires
2638 no locks and therefore significantly accelerates the fast path to allocate
2639 and free small amounts of memory. Refilling an empty cache requires locking
2640 the underlying arena. Performance measurements show significant gains in a
2641 wide variety of user workloads. Workloads were captured using a special
2642 instrumented malloc and analyzed with a malloc simulator. Contributed by
2643 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2645 * Unicode 10.0.0 Support: Character encoding, character type info, and
2646 transliteration tables are all updated to Unicode 10.0.0, using
2647 generator scripts contributed by Mike FABIAN (Red Hat).
2648 These updates cause user visible changes, especially the changes in
2649 wcwidth for many emoji characters cause problems when emoji sequences
2650 are rendered with pango, see for example:
2651 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2653 * Collation of Hungarian has been overhauled and is now consistent with "The
2654 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2657 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2659 - The GNU C Library will now detect when /etc/resolv.conf has been
2660 modified and reload the changed configuration. The new resolver option
2661 “no-reload” (RES_NORELOAD) disables this behavior.
2663 - The GNU C Library now supports an arbitrary number of search domains
2664 (configured using the “search” directive in /etc/resolv.conf);
2665 previously, there was a hard limit of six domains. For backward
2666 compatibility, applications that directly modify the ‘_res’ global
2667 object are still limited to six search domains.
2669 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2670 Library will now randomly pick a name server from the configuration as a
2671 starting point. (Previously, the second name server was always used.)
2673 * The tunables feature is now enabled by default. This allows users to tweak
2674 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2676 * New function reallocarray, which resizes an allocated block (like realloc)
2677 to the product of two sizes, with a guaranteed clean failure upon integer
2678 overflow in the multiplication. Originally from OpenBSD, contributed by
2679 Dennis Wölfing and Rüdiger Sonderfeld.
2681 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2682 These are extended versions of preadv and pwritev, respectively, taking an
2683 additional flags argument. The set of supported flags depends on the
2684 running kernel; full support currently requires kernel 4.7 or later.
2686 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2687 create a new session ID for the spawned process. This feature is
2688 scheduled to be added to the next major revision of POSIX; for the time
2689 being, it is available under _GNU_SOURCE.
2691 * errno.h is now safe to use from C-preprocessed assembly language on all
2692 supported operating systems. In this context, it will only define the
2693 Exxxx constants, as preprocessor macros expanding to integer literals.
2695 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2696 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2697 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2698 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2700 To compile programs that use this feature, the compiler must support
2701 128-bit floating point with the type name _Float128 (as defined by TS
2702 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2703 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2704 must be defined to make the new interfaces visible.
2706 The new functions and macros correspond to those present for other
2707 floating-point types (except for a few obsolescent interfaces not
2708 supported for the new type), with F128 or f128 suffixes; for example,
2709 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2710 printf or scanf formats for the new type; the strfromf128 and strtof128
2711 interfaces should be used instead.
2713 Deprecated and removed features, and other changes affecting compatibility:
2715 * The synchronization that pthread_spin_unlock performs has been changed to
2716 now be equivalent to a C11 atomic store with release memory order to the
2717 spin lock's memory location. Previously, several (but not all)
2718 architectures used stronger synchronization (e.g., containing what is
2719 often called a full barrier). This change can improve performance, but
2720 may affect odd fringe uses of spin locks that depend on the previous
2721 behavior (e.g., using spin locks as atomic variables to try to implement
2722 Dekker's mutual exclusion algorithm).
2724 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2727 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2728 will only be built and installed when the GNU C Library is configured with
2729 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2730 as TIRPC or rpcsvc-proto, to be used.
2732 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2733 libnss_compat, are deprecated, and will not be built or installed by
2736 The NIS(+) support library, libnsl, is also deprecated. By default, a
2737 compatibility shared library will be built and installed, but not headers
2738 or development libraries. Only a few NIS-related programs require this
2739 library. (In particular, the GNU C Library has never required programs
2740 that use 'gethostbyname' to be linked with libnsl.)
2742 Replacement implementations based on TIRPC, which additionally support
2743 IPv6, are available from <https://github.com/thkukuk/>. The configure
2744 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2745 name service modules, to be built and installed.
2747 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2748 support is enabled, the configured recursive resolver must support EDNS.
2749 (Responding to EDNS-enabled queries with responses which are not
2750 EDNS-enabled is fine, but FORMERR responses are not.)
2752 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2753 servers have not supported this opcode for a long time.
2755 * The _res_opcodes variable has been removed from libresolv. It had been
2756 exported by accident.
2758 * <string.h> no longer includes inline versions of any string functions,
2759 as this kind of optimization is better done by the compiler. The macros
2760 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2762 * The nonstandard header <xlocale.h> has been removed. Most programs should
2763 use <locale.h> instead. If you have a specific need for the definition of
2764 locale_t with no other declarations, please contact
2765 libc-alpha@sourceware.org and explain.
2767 * The obsolete header <sys/ultrasound.h> has been removed.
2769 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2771 * The obsolete function cfree has been removed. Applications should use
2774 * The stack_t type no longer has the name struct sigaltstack. This changes
2775 the C++ name mangling for interfaces involving this type.
2777 * The ucontext_t type no longer has the name struct ucontext. This changes
2778 the C++ name mangling for interfaces involving this type.
2780 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2781 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2782 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2783 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2784 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2785 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2786 fpregset_t type no longer has the name struct fpu. This changes the C++
2787 name mangling for interfaces involving those types.
2789 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2790 synced with the kernel:
2792 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2793 are not supported on this architecture and have been removed.
2795 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2796 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2797 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2799 Programs that assume the GET/SETREGS ptrace requests are universally
2800 available will now fail to build, instead of malfunctioning at runtime.
2802 Changes to build and runtime requirements:
2804 * Linux kernel 3.2 or later is required at runtime, on all architectures
2805 supported by that kernel. (This is a change from version 2.25 only for
2808 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2810 * On most architectures, GCC 4.9 or later is required to build the GNU C
2811 Library. On powerpc64le, GCC 6.2 or later is required.
2813 Older GCC versions and non-GNU compilers are still supported when
2814 compiling programs that use the GNU C Library. (We do not know exactly
2815 how old, and some GNU extensions to C may be _de facto_ required. If you
2816 are interested in helping us make this statement less vague, please
2817 contact libc-alpha@sourceware.org.)
2819 Security related changes:
2821 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2822 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2824 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2825 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2827 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2828 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2831 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2832 fixed (CVE-2017-12133).
2834 The following bugs are resolved with this release:
2836 [984] network: Respond to changed resolv.conf in gethostbyname
2837 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2838 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2840 [12189] libc: __stack_chk_fail should not attempt a backtrace
2842 [14096] time: Race condition on timezone/tst-timezone.out
2843 [14172] localedata: az_IR: new locale
2844 [14995] build: glibc fails to build if gold is the default linker, even if
2846 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2847 [16637] network: inet_pton function is accepting IPv6 with bad format
2848 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2849 x86 and other generic code
2850 [16875] localedata: ko_KR: fix lang_name
2851 [17225] localedata: ar_SY: localized month names for May and June are
2853 [17297] localedata: da_DK: wrong date_fmt string
2854 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2855 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2856 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2857 [19066] localedata: ar_SA abbreviated day and month names are in English
2858 [19569] network: resolv: Support an arbitrary number of search domains
2859 [19570] network: Implement random DNS server selection in the stub
2861 [19838] locale: localedef fails on PA-RISC
2862 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2863 order of 0D36 and 0D37
2864 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2866 [20098] libc: FAIL: debug/backtrace-tst on hppa
2867 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2869 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2871 [20313] localedata: Update locale data to Unicode 9.0
2872 [20424] manual: Document how to provide a malloc replacement
2873 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2875 [20686] locale: Add el_GR@euro to SUPPORTED.
2876 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2877 failures consistently
2878 [21015] dynamic-link: Document and fix --enable-bind-now
2879 [21016] nptl: pthread_cond support is broken on hppa
2880 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2881 frame-pointer on i386
2882 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2884 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2885 [21088] libc: Build fails with --enable-static-nss
2886 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2887 generic c code is used
2888 [21109] libc: Tunables broken on big-endian
2889 [21112] math: powf has large ulp errors with base close to 1 and exponent
2891 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
2893 [21120] malloc: glibc malloc is incompatible with GCC 7
2894 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
2896 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
2897 (-0.0) when linking with -lieee
2898 [21171] math: log10, log2 and lgamma return incorrect results
2899 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
2900 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
2901 [21207] localedata: ce_RU: update weekdays from CLDR
2902 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
2903 [21217] localedata: Update months from CLDR-31
2904 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
2905 [21243] libc: support_delete_temp_file should issue warning for failed
2907 [21244] libc: support resolv_test_start() socket fd close should be
2909 [21253] libc: localedef randomly segfaults when using -fstack-check due to
2910 new posix_spawn implementation
2911 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
2912 leads to lower CPU frequency
2913 [21259] libc: [alpha] termios.h missing IXANY for POSIX
2914 [21261] libc: [sparc64] bits/setjmp.h namespace
2915 [21267] network: [mips] bits/socket.h IOC* namespace
2916 [21268] libc: [alpha] termios.h NL2, NL3 namespace
2917 [21270] libc: mmap64 silently truncates large offset values
2918 [21275] libc: posix_spawn always crashes on ia64 now
2919 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
2920 [21280] math: [powerpc] logbl for POWER7 return incorrect results
2921 [21289] libc: Incorrect declaration for 32-bit platforms with
2922 _FILE_OFFSET_BITS=64 causes build error
2923 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
2924 not support gethostbyname4_r
2925 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
2927 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
2929 [21340] libc: Support POSIX_SPAWN_SETSID
2930 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
2931 [21359] network: ns_name_pack needs additional byte in destination buffer
2932 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
2933 against fragmentation attacks (CVE-2017-12132)
2934 [21369] network: resolv: Remove EDNS fallback
2935 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
2937 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
2938 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
2939 [21393] stdio: Missing dup3 error check in freopen, freopen64
2940 [21396] libc: Use AVX2 memcpy/memset on Skylake server
2941 [21399] localedata: Bad description for U00EC in
2942 localedata/charmaps/CP1254
2943 [21411] malloc: realloc documentation error
2944 [21426] network: sys/socket.h uio.h namespace
2945 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
2946 [21445] libc: signal.h bsd_signal namespace
2947 [21455] network: Network headers stdint.h namespace
2948 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
2950 [21475] network: resolv: Overlong search path is truncated mid-label
2951 [21511] libc: sigstack namespace
2952 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
2953 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
2954 bits/syscall.h: No such file or directory
2955 [21517] libc: struct sigaltstack namespace
2956 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
2957 [21533] localedata: Update locale data to Unicode 10.0
2959 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
2960 junk at end of line, first unrecognized character is `@'
2961 [21538] libc: SIG_HOLD missing for XPG4
2962 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
2963 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
2964 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
2965 [21543] libc: sigevent namespace
2966 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
2967 size for general purpose registers in mcontext_t structure
2968 [21550] libc: sigwait namespace
2969 [21552] libc: XPG4 bsd_signal namespace
2970 [21554] libc: sigpause namespace
2971 [21560] libc: sys/wait.h signal.h namespace
2972 [21561] libc: waitid namespace
2973 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
2974 '/usr/include/stdlib.h': Permission denied
2975 [21575] libc: sys/wait.h missing struct rusage definition
2976 [21584] libc: sigaltstack etc namespace
2977 [21597] libc: siginterrupt namespace
2978 [21607] math: hppa: FAIL: math/test-tgmath
2979 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
2981 [21622] libc: [tile] missing SA_* for POSIX.1:2008
2982 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
2983 stack and heap (CVE-2017-1000366)
2984 [21625] libc: wait3 namespace
2985 [21654] nss: Incorrect pointer alignment in NSS group merge result
2987 [21657] network: Parse interface zone id for node-local multicast
2988 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
2990 [21666] libc: .symver is used on common symbol
2991 [21668] network: resolv: res_init cross-thread broadcast introduces race
2993 [21687] math: tgmath.h totalorder, totalordermag return type
2994 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
2996 [21696] libc: Incorrect assumption of of __cpu_mask in
2997 posix/sched_cpucount.c
2998 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
2999 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3001 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3002 leading to relocation crash
3003 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3004 `resolv_conf_matches (resp, conf)' failed.
3005 [21710] localedata: Added Samoan language locale for Samoa
3006 [21711] localedata: Pashto yesstr/nostr locale are missing
3007 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3008 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3009 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3010 [21723] localedata: yesstr/nostr missing for Chinese language locale
3011 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3013 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3015 [21728] localedata: New Locale for Tongan language
3016 [21729] localedata: incorrect LC_NAME fields for hi_IN
3017 [21733] localedata: yesstr and nostr are missing for zh_HK
3018 [21734] localedata: Missing yesstr and nostr are for kw_GB
3019 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3020 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3021 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3022 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3024 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3026 [21749] localedata: Wrong abbreviated day name (“abday”) for
3028 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3029 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3030 [21759] localedata: missing yesstr and nostr for Tigrinya
3031 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3032 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3033 [21767] localedata: Missing Bislama locales
3034 [21768] localedata: Missing yesstr and nostr for aa_ET
3035 [21770] localedata: Missing Field in li_NL
3036 [21778] nptl: Robust mutex may deadlock
3037 [21779] libc: MicroBlaze segfaults when loading libpthread
3038 [21783] localedata: Fix int_select international_call_prefixes
3039 [21784] localedata: Inconsistency in country_isbn
3040 [21788] localedata: Missing Country Postal Abbreviations
3041 [21794] localedata: Added-country_isbn-for-Italy
3042 [21795] localedata: Add/Fix country_isbn for France
3043 [21796] localedata: Added country_isbn for Republic of Korea
3044 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3045 [21799] localedata: Added int_select international_call_prefixes
3046 [21801] localedata: Added int_select international_call_prefixes
3047 [21804] nptl: Double semicolon in thread-shared-types.h
3048 [21807] localedata: LC_ADDRESS fix for pap_CW
3049 [21808] localedata: Fix LC_ADDRESS for pap_AW
3050 [21821] localedata: Added country_name in mai_IN
3051 [21822] localedata: Fix LC_TIME for mai_IN
3052 [21823] localedata: missing yesstr, nostr for sa_IN
3053 [21825] localedata: Fix name_mrs for mag_IN
3054 [21828] localedata: 2.26 changelog should mention user visible changes
3056 [21835] localedata: Added Maithili language locale for Nepal
3057 [21838] localedata: Removed redundant data for the_NP
3058 [21839] localedata: Fix LC_MONETARY for ta_LK
3059 [21844] localedata: Fix Latin characters and Months Sequence.
3060 [21848] localedata: Fix mai_NP Title Name
3065 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3066 24731-2:2010, is supported to enable declarations of functions from that
3067 TR. Note that not all functions from that TR are supported by the GNU C
3070 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3071 18661-1:2014, is supported to enable declarations of functions and macros
3072 from that TS. Note that not all features from that TS are supported by
3075 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3076 18661-4:2015, is supported to enable declarations of functions and macros
3077 from that TS. Note that most features from that TS are not supported by
3080 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3081 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3082 Since the GNU C Library defaults to a much newer revision of POSIX, this
3083 will only affect programs that specifically request an old conformance
3084 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3085 see a change in the visible declarations, but a program compiled with
3086 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3089 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3090 defined by all multithreaded code, but glibc has not required this for
3093 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3094 means that in a future release, the macros “major”, “minor”, and “makedev”
3095 will only be available from <sys/sysmacros.h>.
3097 These macros are not part of POSIX nor XSI, and their names frequently
3098 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3099 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3100 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3103 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3104 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3105 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3107 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3108 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3109 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3110 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3111 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3112 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3113 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3114 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3115 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3116 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3117 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3120 * New <math.h> features are added from TS 18661-1:2014:
3122 - Signaling NaN macros: SNANF, SNAN, SNANL.
3124 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3125 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3126 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3128 - llogb functions: the llogb, llogbf and llogbl functions, and the
3129 FP_LLOGB0 and FP_LLOGBNAN macros.
3131 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3134 - Comparison macros: iseqsig.
3136 - Classification macros: iscanonical, issubnormal, iszero.
3138 - Total order functions: totalorder, totalorderf, totalorderl,
3139 totalordermag, totalordermagf, totalordermagl.
3141 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3143 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3144 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3146 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3147 are added to libc. They convert a floating-point number into string.
3149 * Most of glibc can now be built with the stack smashing protector enabled.
3150 It is recommended to build glibc with --enable-stack-protector=strong.
3151 Implemented by Nick Alcock (Oracle).
3153 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3154 intended to be used instead of memset() to erase sensitive data after use;
3155 the compiler will not optimize out calls to explicit_bzero even if they
3156 are "unnecessary" (in the sense that no _correct_ program can observe the
3157 effects of the memory clear).
3159 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3160 to float instead of double. This does not affect the ABI of any libraries
3161 that are part of the GNU C Library, but may affect the ABI of other
3162 libraries that use this type in their interfaces.
3164 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3165 float_t and double_t types are now defined to long double instead of float
3166 and double. These options are not the default, and this does not affect
3167 the ABI of any libraries that are part of the GNU C Library, but it may
3168 affect the ABI of other libraries that use this type in their interfaces,
3169 if they are compiled or used with those options.
3171 * The getentropy and getrandom functions, and the <sys/random.h> header file
3174 * The buffer size for byte-oriented stdio streams is now limited to 8192
3175 bytes by default. Previously, on Linux, the default buffer size on most
3176 file systems was 4096 bytes (and thus remains unchanged), except on
3177 network file systems, where the buffer size was unpredictable and could be
3178 as large as several megabytes.
3180 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3181 for the Linux quota interface which predates kernel version 2.4.22 has
3184 * The malloc_get_state and malloc_set_state functions have been removed.
3185 Already-existing binaries that dynamically link to these functions will
3186 get a hidden implementation in which malloc_get_state is a stub. As far
3187 as we know, these functions are used only by GNU Emacs and this change
3188 will not adversely affect already-built Emacs executables. Any undumped
3189 Emacs executables, which normally exist only during an Emacs build, should
3190 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3192 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3193 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3194 “no-ip6-dotint” had already been the default, and support for the
3195 “ip6-dotint” option was removed from the Internet in 2006.
3197 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3198 flag from <resolv.h> have been removed. The option relied on a
3199 backwards-incompatible DNS extension which was never deployed on the
3202 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3203 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3204 They were already unimplemented.
3206 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3207 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3208 removed again from the IETF name lookup interface specification in RFC
3209 2553. Applications should use getaddrinfo instead.
3211 * DNSSEC-related declarations and definitions have been removed from the
3212 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3213 decode the data part of DNSSEC record types. Previous versions of glibc
3214 only implemented minimal support for the previous version of DNSSEC, which
3215 is incompatible with the currently deployed version.
3217 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3218 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3219 <arpa/nameser.h> header file because the distinction between RR types and
3220 meta-RR types is not officially standardized, subject to revision, and
3221 thus not suitable for encoding in a macro.
3223 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3224 and rhook members of the res_state type in <resolv.h> have been removed.
3225 The glibc stub resolver did not support these hooks, but the header file
3226 did not reflect that.
3228 * For multi-arch support it is recommended to use a GCC which has
3229 been built with support for GNU indirect functions. This ensures
3230 that correct debugging information is generated for functions
3231 selected by IFUNC resolvers. This support can either be enabled by
3232 configuring GCC with '--enable-gnu-indirect-function', or by
3233 enabling it by default by setting 'default_gnu_indirect_function'
3234 variable for a particular architecture in the GCC source file
3237 * GDB pretty printers have been added for mutex and condition variable
3238 structures in POSIX Threads. When installed and loaded in gdb these pretty
3239 printers show various pthread variables in human-readable form when read
3240 using the 'print' or 'display' commands in gdb.
3242 * Tunables feature added to allow tweaking of the runtime for an application
3243 program. This feature can be enabled with the '--enable-tunables' configure
3244 flag. The GNU C Library manual has details on usage and README.tunables has
3245 instructions on adding new tunables to the library.
3247 * A new version of condition variables functions have been implemented in
3248 the NPTL implementation of POSIX Threads to provide stronger ordering
3251 * A new version of pthread_rwlock functions have been implemented to use a more
3252 scalable algorithm primarily through not using a critical section anymore to
3255 Security related changes:
3257 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3258 have been created with makecontext could fail to terminate due to a
3259 missing .cantunwind annotation. This has been observed to lead to a hang
3260 (denial of service) in some Go applications compiled with gccgo. Reported
3261 by Andreas Schwab. (CVE-2016-6323)
3263 * The DNS stub resolver functions would crash due to a NULL pointer
3264 dereference when processing a query with a valid DNS question type which
3265 was used internally in the implementation. The stub resolver now uses a
3266 question type which is outside the range of valid question type values.
3269 The following bugs are resolved with this release:
3271 [4099] stdio: Overly aggressive caching by stream i/o functions.
3272 [7065] build: Support building glibc with -fstack-protector or -fstack-
3274 [9842] localedata: en_CA: incorrect date format
3275 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3276 before it started waiting
3277 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3278 [15765] nptl: sem_open is wrongly a cancellation point
3279 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3280 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3282 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3283 library linked with pthread
3284 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3285 "FIXME: Ingo" issue)
3286 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3287 [17252] libc: getrandom and getentropy syscall
3288 [17730] malloc: thread-local storage is sometimes improperly free()'d
3289 after being __libc_memalign()'d
3290 [18241] stdio: failed fseek on memstream does not set errno and can fail
3292 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3294 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3295 PTHREAD_PRIO_INHERIT mutex on ARM
3296 [18784] network: res_query and related function crash for special record
3297 type queries (CVE-2015-5180)
3298 [19380] math: strtod does not raise "inexact"
3299 [19387] string: Integer overflow in memchr
3300 [19390] string: Integer overflow in strncat
3301 [19398] build: linknamespace tests fail with massively parallel build
3302 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3304 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3305 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3306 [19514] libc: [PATCH] Fix spelling errors in spelling
3307 "implement"/"implementation" in several places
3308 [19582] network: Deprecate RES_USE_INET6
3309 [19673] manual: clog10 docs appear to be erroneous
3310 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3311 causes a segmentation fault
3312 [19826] libc: invalid pointer returned from __tls_get_addr with static
3314 [20016] network: resolv: Remove hooks support from the API
3315 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3317 [20033] math: [x86_64] vectorized math function don't call the __finite
3319 [20116] nptl: use after free in pthread_create
3320 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3321 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3323 [20311] nptl: please install proc_service.h
3324 [20366] libc: Compilation errors in installed headers in strict-compliance
3326 [20370] malloc: malloc: Arena free list management is still racy
3327 (incorrect fix in bug 19243)
3328 [20386] libc: assert (X = 0) does not result in GCC warning
3329 [20432] malloc: malloc: Minimize interface required for interposition
3330 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3331 in _Unwind_Backtrace (CVE-2016-6323)
3332 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3333 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3335 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3336 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3337 [20477] network: resolv: incorrect double-checked locking related to
3339 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3341 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3343 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3344 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3345 cause transition penalty
3346 [20517] math: sparcv9 missing fdiml compat symbol
3347 [20524] manual: strverscmp is inconsistent
3348 [20525] libc: <sys/quota.h> should be based on kernel headers
3349 [20539] math: GCC 7 -static -lm fails to link at -O3
3350 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3352 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3354 [20591] network: Remove obsolete DNSSEC support
3355 [20592] network: DNS resource record type classification macros in
3356 <arpa/nameser.h> are incorrect
3357 [20593] network: Update DNS RR type definitions
3358 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3359 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3361 [20629] network: libresolv: Remove support for bitstring labels
3363 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3364 assertion: "maxidx >= 2"
3365 [20660] math: [arm] Use VSQRT
3366 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3367 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3368 [20689] libc: Test for FMA should also check for AVX.
3369 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3370 [20715] math: iszero macro breaks existing code
3371 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3372 [20728] libc: powerpc: Missing TOC stub in clone
3373 [20729] build: glibc-2.24 fails to build for i486 with -Os
3374 [20750] build: Build fails with default PIE enabled gcc-6.x
3375 [20768] math: [alpha] sqrt fegetenv namespace
3376 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3378 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3379 __FLT_EVAL_METHOD__ is 2
3380 [20790] network: rpcgen buffer overrun in get_prog_declaration
3381 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3382 [20829] libc: crypt snprintf namespace
3383 [20847] libc: tst-vfork3 failure
3384 [20855] math: Default bits/mathdef.h has inappropriate float_t
3385 [20859] math: [sh4] FP_ILOGB0 invalid
3386 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3387 U+20AC), not same as GBK
3388 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3389 [20916] math: pow handling of sNaN arguments
3390 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3391 [20919] math: Bad pow (qNaN, 0) result with -lieee
3392 [20940] math: hypot sNaN handling
3393 [20947] math: fmax, fmin sNaN handling
3394 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3395 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3397 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3398 [20973] nptl: robust mutexes: Lost wake-ups
3399 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3400 [20978] nis: strlen on null pointer in nss_nisplus
3401 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3403 [21014] string: i686 memchr overflows internal pointer check
3404 [21019] libc: [mips] n32 lseek incorrect on overflow
3405 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3406 [21026] libc: [MIPS] readahead syscall is broken on n64
3407 [21028] math: Fallback fesetexceptflag should always succeed
3408 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3409 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3411 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3412 [21061] librt: [microblaze] librt lost clock_* exports
3413 [21073] libc: tunables: insecure environment variables passed to
3414 subprocesses with AT_SECURE
3415 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3419 * The minimum Linux kernel version that this version of the GNU C Library
3420 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3421 kernel version 2.6.32 or later suffices (on architectures that already
3422 required kernel versions more recent than 3.2, those requirements remain
3423 unchanged). Linux 3.2 or later kernel headers are required on all
3426 * The pap_AN locale has been deleted. This has been deprecated for a long
3427 time. It has been replaced by pap_AW & pap_CW, both of which have long
3428 been included in previous releases.
3430 * The readdir_r and readdir64_r functions have been deprecated. It is
3431 recommended to use readdir and readdir64 instead.
3433 * The type “union wait” has been removed. It was deprecated in the early
3434 1990s and never part of POSIX. Application code should use the int type
3435 instead of “union wait”.
3437 * A new NSS action is added to facilitate large distributed system
3438 administration. The action, MERGE, allows remote user stores like LDAP
3439 to be merged into local user stores like /etc/groups in order to provide
3440 easy to use, updated, and managed sets of merged credentials. The new
3441 action can be used by configuring it in /etc/nsswitch.conf:
3442 group: files [SUCCESS=merge] nis
3443 Implemented by Stephen Gallagher (Red Hat).
3445 * The deprecated __malloc_initialize_hook variable has been removed from the
3448 * The long unused localedef --old-style option has been removed. It hasn't
3449 done anything in over 16 years. Scripts using this option can safely
3452 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3453 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3454 return the next representable value in the direction of positive infinity
3455 and the nextdown functions return the next representable value in the
3456 direction of negative infinity. These are currently enabled as GNU
3459 Security related changes:
3461 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3462 could result in a stack overflow when getnetbyname was called with an
3463 overly long name. (CVE-2016-3075)
3465 * Previously, getaddrinfo copied large amounts of address data to the stack,
3466 even after the fix for CVE-2013-4458 has been applied, potentially
3467 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3468 instead. Reported by Michael Petlan. (CVE-2016-3706)
3470 * The glob function suffered from a stack-based buffer overflow when it was
3471 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3472 Reported by Alexander Cherepanov. (CVE-2016-1234)
3474 * The Sun RPC UDP client could exhaust all available stack space when
3475 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3476 alloca plugin for GCC. (CVE-2016-4429)
3478 * The IPv6 name server management code in libresolv could result in a memory
3479 leak for each thread which is created, performs a failing naming lookup,
3480 and exits. Over time, this could result in a denial of service due to
3481 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3483 The following bugs are resolved with this release:
3485 [1170] localedata: ne_NP: update Nepali locale definition file
3486 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3488 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3489 [6796] math: fdim() does not set errno on overflow
3490 [10354] libc: posix_spawn should use vfork() in more cases than presently
3491 [11213] localedata: localedata: add copyright disclaimer to locale files
3492 [12143] localedata: chr_US: new Cherokee locale
3493 [12450] localedata: sgs_LT: new locale
3494 [12676] localedata: ln_CD: new locale
3495 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3497 [13304] math: fma, fmaf, fmal produce wrong results
3498 [14259] build: --localedir arg to configure is ignored
3499 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3500 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3501 [14934] localedata: es_CL: wrong first weekday chilean locale
3502 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3504 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3506 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3507 [15368] nptl: raise() is not async-signal-safe
3508 [15479] math: ceil, floor, round and trunc raise inexact exception
3509 [15578] localedata: kk_KZ: various updates
3510 [16003] localedata: pap_AN: punt old locale
3511 [16137] localedata: iw_IL: punt old locale
3512 [16190] localedata: eo: new esperanto locale
3513 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3514 [16742] malloc: race condition: pthread_atfork() called before first
3515 malloc() results in unexpected locking behaviour/deadlocks
3516 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3518 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3519 [17565] localedata: pt_PT: wrong (work-)week start
3520 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3521 [17950] build: Build fails with -msse
3522 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3523 [18433] libc: posix_spawn does not return correctly upon failure to
3525 [18453] localedata: charmaps/IBM875: incorrect codes
3526 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3528 [18896] localedata: he_IL: improvements for currency
3529 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3530 Romanian locale data
3531 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3533 [19056] libc: Deprecate readdir_r
3534 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3536 [19198] localedata: nl_NL: small improvements for Dutch locales
3537 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3538 nameservers (CVE-2016-5417)
3539 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3541 [19400] locale: Language missing in "iso-639.def", trivial fix in
3543 [19431] malloc: Deadlock between fflush, getdelim, and fork
3544 [19505] libc: Incorrect file descriptor validity checks in
3545 posix_spawn_file_actions_add{open,close,dup2}
3546 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3547 when using RTLD_NEXT
3548 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3549 `intl/{gettextP,loadinfo}.h'
3550 [19534] libc: execle, execlp may use malloc
3551 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3552 [19573] network: res_nclose and __res_maybe_init disagree about name
3553 server initialization, breaking Hesiod
3554 [19575] localedata: Status of GB18030 tables
3555 [19581] localedata: sr_* date_fmt string contains additional newline
3556 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3558 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3559 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3560 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3561 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3563 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3565 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3567 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3568 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3569 [19633] locale: strfmon_l applies global locale to number formatting
3570 [19642] network: Memory leak in getnameinfo
3571 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3572 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3574 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3575 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3577 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3578 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3580 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3582 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3584 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3585 pointers and lengths in error-case.
3586 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3587 report errors on UTF-16 surrogates values.
3588 [19755] nscd: nscd assertion failure in gc
3589 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3590 [19759] libc: mempcpy shouldn't be inlined
3591 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3592 [19765] libc: s390 needs an optimized mempcpy
3593 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3594 NAME_MAX limit assumption (CVE-2016-1234)
3595 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3596 [19787] network: Missing and incorrect truncation checks in getnameinfo
3597 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3599 [19791] network: Assertion failure in res_query.c with un-connectable name
3601 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3602 [19822] math: libm.so install clobbers old version
3603 [19825] network: resolv: send_vc can return uninitialized data in second
3604 response to getaddrinfo
3605 [19830] network: nss_dns: should check RDATA length against buffer length
3606 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3607 confronted with A/AAAA records of invalid size
3608 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3609 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3610 [19853] stdio: Printing IBM long double in decimal with high precision is
3612 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3613 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3614 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3616 [19865] network: Assertion failure or memory leak in
3617 _nss_dns_getcanonname_r
3618 [19868] network: nss_dns: netent code does not skip over non-PTR records
3619 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3621 [19881] string: Improve x86-64 memset
3622 [19907] string: Incorrect memcpy tests
3623 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3625 [19925] libc: termios.h XCASE namespace
3626 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3627 [19929] libc: limits.h NL_NMAX namespace
3628 [19931] stdio: Memory leak in vfprintf
3629 [19957] libc: clone(CLONE_VM) access invalid parent memory
3630 [19963] localedata: en_IL: New locale
3631 [19989] stdio: stdio.h cuserid namespace
3632 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3634 [19996] locale: langinfo.h nl_langinfo_l namespace
3635 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3636 [20010] network: getaddrinfo: Stack overflow in hostent translation
3638 [20012] stdio: libio: fmemopen append mode failure
3639 [20014] stdio: stdio.h namespace for pre-threads POSIX
3640 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3641 [20023] libc: fcntl.h timespec namespace
3642 [20024] math: [x86_64] vectorized sincos trashes the stack
3643 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3644 [20041] time: sys/time.h timespec namespace
3645 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3646 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3647 [20051] libc: ttyslot in wrong header under wrong conditions
3648 [20054] libc: gethostname not declared for XPG4
3649 [20055] libc: termios.h missing tcgetsid for XPG4
3650 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3652 [20073] libc: sys/stat.h fchmod namespace
3653 [20074] libc: stdlib.h rand_r namespace
3654 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3655 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3657 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3658 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3660 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3661 [20119] libc: Wrong mask for processors level type from CPUID
3662 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3663 AS not supporting AVX512
3664 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3666 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3667 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3669 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3670 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3671 [20178] libc: posix_spawn{p} should not call exit
3672 [20191] stdio: libio: vtables hardening
3673 [20195] string: FMA4 detection requires CPUID execution with register
3675 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3676 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3678 [20212] math: acos (sNaN) returns sNaN
3679 [20213] math: asin (sNaN) returns sNaN
3680 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3681 [20218] math: [i386] asinhl (sNaN) returns sNaN
3682 [20219] math: [i386] atanhl (sNaN) returns sNaN
3683 [20222] stdio: fopencookie: Mangle function pointers
3684 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3685 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3686 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3688 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3689 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3690 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3691 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3692 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3693 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3694 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3695 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3696 [20240] math: modf (sNaN) returns sNaN
3697 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3698 [20250] math: frexp (sNaN) returns sNaN
3699 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3700 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3702 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3703 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3704 subscript is below array bounds [-Werror=array-bounds]
3705 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3706 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3708 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3709 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3711 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3712 "invalid" exceptions
3713 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3714 [20316] localedata: id_ID: Februari instead of Pebruari
3715 [20327] string: POWER8 strcasecmp returns incorrect result
3716 [20347] math: Failure: Test: j0_downward (0xap+0)
3717 [20348] libc: FAIL: misc/tst-preadvwritev64
3718 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3719 [20350] libc: There is no test for p{read,write}64
3720 [20357] math: Incorrect cos result for 1.5174239687223976
3721 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3725 * Unicode 8.0.0 Support: Character encoding, character type info, and
3726 transliteration tables are all updated to Unicode 8.0.0, using new
3727 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3728 These updates cause user visible changes, such as the fixes for bugs
3729 89, 16061, and 18568.
3731 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3732 kernel-internal CPU set size. This means that requests that change the
3733 CPU affinity which failed before (for example, an all-ones CPU mask) will
3734 now succeed. Applications that need to determine the effective CPU
3735 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3736 setting it because the kernel can adjust it (and the previous size check
3737 would not detect this in the majority of cases).
3739 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3740 the following new symbols are used: fts64_children, fts64_close,
3741 fts64_open, fts64_read and fts64_set.
3743 * getaddrinfo now detects certain invalid responses on an internal netlink
3744 socket. If such responses are received, an affected process will
3745 terminate with an error message of "Unexpected error <number> on netlink
3746 descriptor <number>" or "Unexpected netlink response of size <number> on
3747 descriptor <number>". The most likely cause for these errors is a
3748 multi-threaded application which erroneously closes and reuses the netlink
3749 file descriptor while it is used by getaddrinfo.
3751 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3752 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3753 unnecessary serialization of memory allocation requests across threads.
3754 The defect is now corrected. Users should see a substantial increase in
3755 the concurent throughput of allocation requests for applications which
3756 trigger this bug. Affected applications typically create and
3757 destroy threads frequently. (Bug 19048 was reported and analyzed by
3760 * There is now a --disable-timezone-tools configure option for disabling the
3761 building and installing of the timezone related utilities (zic, zdump, and
3762 tzselect). This is useful for people who build the timezone data and code
3763 independent of the GNU C Library.
3765 * The obsolete header <regexp.h> has been removed. Programs that require
3766 this header must be updated to use <regex.h> instead.
3768 * The obsolete functions bdflush, create_module, get_kernel_syms,
3769 query_module and uselib are no longer available to newly linked binaries;
3770 the header <sys/kdaemon.h> has been removed. These functions and header
3771 were specific to systems using the Linux kernel and could not usefully be
3772 used with the GNU C Library on systems with version 2.6 or later of the
3775 * Optimized string, wcsmbs and memory functions for IBM z13.
3776 Implemented by Stefan Liebler.
3778 * Newly linked programs that define a variable called signgam will no longer
3779 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3780 require signgam to be set by those functions must ensure that they use the
3781 variable provided by the GNU C Library and declared in <math.h>, without
3782 defining their own copy.
3784 * The minimum GCC version that can be used to build this version of the GNU
3785 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3786 still be used to compile programs using the GNU C Library.
3788 Security related changes:
3790 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3791 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3793 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3794 the pointer guard feature. It is always enabled. Previously,
3795 LD_POINTER_GUARD could be used to disable security hardening in binaries
3796 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3799 * An integer overflow in hcreate and hcreate_r could lead to an
3800 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3802 * The catopen function no longer has unbounded stack usage. Reported by
3803 Max. (CVE-2015-8779)
3805 * The nan, nanf and nanl functions no longer have unbounded stack usage
3806 depending on the length of the string passed as an argument to the
3807 functions. Reported by Joseph Myers. (CVE-2014-9761)
3809 * A stack-based buffer overflow was found in libresolv when invoked from
3810 libnss_dns, allowing specially crafted DNS responses to seize control
3811 of execution flow in the DNS client. The buffer overflow occurs in
3812 the functions send_dg (send datagram) and send_vc (send TCP) for the
3813 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3814 family. The use of AF_UNSPEC triggers the low-level resolver code to
3815 send out two parallel queries for A and AAAA. A mismanagement of the
3816 buffers used for those queries could result in the response of a query
3817 writing beyond the alloca allocated buffer created by
3818 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3819 the overflow. Thanks to the Google Security Team and Red Hat for
3820 reporting the security impact of this issue, and Robert Holiday of
3821 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3823 The following bugs are resolved with this release:
3825 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3826 [887] math: Math library function "logb" and "nextafter" inconsistent
3827 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3828 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3829 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3830 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3832 [4404] localedata: German translation of "Alarm clock" is misleading
3833 [6799] math: nextafter() and nexttoward() doen't set errno on
3834 overflow/underflow errors
3835 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3837 [10432] nis: _nss_nis_setnetgrent assertion failure
3838 [11460] libc: fts has no LFS support
3839 [12926] network: getaddrinfo()/make_request() may spin forever
3840 [13065] nptl: Race condition in pthread barriers
3841 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3842 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3844 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3845 [14912] libc: Rename non-installed bits/*.h headers
3846 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3847 [15367] math: Let gcc use __builtin_isinf
3848 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3849 [15421] math: lgamma wrongly sets signgam for ISO C
3850 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3851 FE_INVALID with argument out of range
3852 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3854 [15786] dynamic-link: ifunc resolver functions can smash function
3856 [15918] math: Unnecessary check for equality in hypotf()
3857 [16061] localedata: Review / update transliteration data
3858 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3860 [16141] time: strptime %z offset restriction
3861 [16171] math: drem should be alias of remainder
3862 [16296] math: fegetround is pure?
3863 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3864 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3866 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3867 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3869 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3870 "Exception "Inexact" set" on ppc32
3871 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3872 [16517] math: Missing underflow exception from tanf/tan/tanl
3873 [16519] math: Missing underflow exception from sinhf
3874 [16520] math: Missing underflow exception from tanhf
3875 [16521] math: Missing underflow exception from exp2
3876 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3878 [16734] stdio: fopen calls mmap to allocate its buffer
3879 [16961] math: nan function incorrect handling of bad sequences
3880 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3881 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3882 [16985] locale: localedef: confusing error message when opening output
3884 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3885 [17197] locale: Redundant shift character in iconv conversion output at
3887 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3888 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3889 [17250] dynamic-link: static linking breaks nss loading
3890 (getaddrinfo/getpwnam/etc...)
3891 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
3893 [17441] math: isnan() should use __builtin_isnan() in GCC
3894 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
3895 (related to lock elision)
3896 [17787] manual: Exponent on page 324 of the PDF ends prematurely
3897 [17886] time: strptime should be able to parse "Z" as a timezone with %z
3898 [17887] time: strptime should be able to parse "+01:00" style timezones
3899 [17905] libc: catopen() Multiple unbounded stack allocations
3901 [18084] libc: backtrace (..., 0) dumps core on x86
3902 [18086] libc: nice() sets errno to 0 on success
3903 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
3904 is too large (CVE-2015-8778)
3905 [18251] dynamic-link: SONAME missing when audit modules provides path
3906 [18265] libc: add attributes for wchar string and memory functions
3907 [18370] math: csqrt missing underflows
3908 [18421] libc: [hppa] read-only segment has dynamic relocations
3909 [18472] libc: Obsolete syscall wrappers should be compat symbols
3910 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
3911 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
3912 [18525] localedata: Remove locale timezone information
3913 [18560] libc: [powerpc] spurious bits/ipc.h definitions
3914 [18568] localedata: Update locale data to Unicode 8.0
3915 [18589] locale: sort-test.sh fails at random
3916 [18595] math: ctan, ctanh missing underflows
3917 [18604] libc: assert macro-expands its argument
3918 [18610] math: S390: fetestexcept() reports any exception if DXC-code
3919 contains a vector instruction exception.
3920 [18611] math: j1, jn missing errno setting on underflow
3921 [18618] localedata: sync Chechen locale definitions with other *_RU
3923 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
3924 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
3925 [18665] network: In send_dg, the recvfrom function is NOT always using the
3926 buffer size of a newly created buffer (CVE-2015-7547)
3927 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
3929 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
3931 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
3932 [18699] math: tilegx cproj() for various complex infinities does not yield
3934 [18724] libc: Harden put*ent functions against data injection
3935 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
3936 [18755] build: build errors with -DNDEBUG
3937 [18757] stdio: fmemopen fails to set errno on failure
3938 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
3940 [18781] libc: openat64 lacks O_LARGEFILE
3941 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
3942 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
3943 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
3944 [18790] math: [ldbl-128ibm] tanhl inaccurate
3945 [18795] libc: stpncpy fortification misses buffer lengths that are
3946 statically too large
3947 [18796] build: build fails for --disable-mathvec
3948 [18803] math: hypot missing underflows
3949 [18820] stdio: fmemopen may leak memory on failure
3950 [18823] math: csqrt spurious underflows
3951 [18824] math: fma spurious underflows
3952 [18825] math: pow missing underflows
3953 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
3954 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
3955 [18870] build: sem_open.c fails to compile with missing symbol
3957 [18872] stdio: Fix memory leak in printf_positional
3958 [18873] libc: posix_fallocate overflow check ineffective
3959 [18875] math: Excess precision leads incorrect libm
3960 [18877] libc: arm: mmap offset regression
3961 [18887] libc: memory corruption when using getmntent on blank lines
3962 [18918] localedata: hu_HU: change time to HH:MM:SS format
3963 [18921] libc: Regression: extraneous stat() and fstat() performed by
3965 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
3966 binaries (CVE-2015-8777)
3967 [18951] math: tgamma missing underflows
3968 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
3970 [18953] localedata: lt_LT: change currency symbol to the euro
3971 [18956] math: powf inaccuracy
3972 [18961] math: [i386] exp missing underflows
3973 [18966] math: [i386] exp10 missing underflows
3974 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
3975 [18969] build: multiple string test failures due to missing locale
3977 [18970] libc: Reference of pthread_setcancelstate in libc.a
3978 [18977] math: float / long double Bessel functions not in XSI POSIX
3979 [18980] math: i386 libm functions return with excess range and precision
3980 [18981] math: i386 scalb*, ldexp return with excess range and precision
3981 [18982] stdio: va_list and vprintf
3982 [18985] time: Passing out of range data to strftime() causes a segfault
3984 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
3985 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
3986 [19012] locale: iconv_open leaks memory on error path
3987 [19016] math: clog, clog10 inaccuracy
3988 [19018] nptl: Mangle function pointers in tls_dtor_list
3989 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
3990 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
3991 [19048] malloc: malloc: arena free list can become cyclic, increasing
3993 [19049] math: [powerpc] erfc incorrect zero sign
3994 [19050] math: [powerpc] log* incorrect zero sign
3995 [19058] math: [x86_64] Link fail with -fopenmp and -flto
3996 [19059] math: nexttoward overflow incorrect in non-default rounding modes
3997 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
3998 [19074] network: Data race in _res_hconf_reorder_addrs
3999 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4000 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4001 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4003 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4005 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4006 [19086] manual: posix_fallocate64 documented argument order is wrong.
4007 [19088] math: lround, llround missing exceptions close to overflow
4009 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4010 [19095] math: dbl-64 lrint incorrect for 64-bit long
4011 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4012 [19124] dynamic-link: ld.so failed to build with older assmebler
4013 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4014 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4015 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4016 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4017 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4018 pthread_setaffinity_np
4019 [19156] math: [ldbl-128] j0l spurious underflows
4020 [19164] nptl: tst-getcpu fails with many possible CPUs
4021 [19168] math: math/test-ildoubl and math/test-ldouble failure
4022 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4023 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4025 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4026 (FE_NOMASK_ENV) do not clear SSE exceptions
4027 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4028 _int_new_arena/reused_arena
4029 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4030 [19201] math: dbl-64 remainder incorrect sign of zero result
4031 [19205] math: bits/math-finite.h conditions do not match math.h and
4033 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4034 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4035 for C99-based standards
4036 [19212] libc: features.h not -Wundef clean
4037 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4039 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4040 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4041 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4043 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4044 "inexact" exceptions
4045 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4047 [19242] libc: strtol incorrect in Turkish locales
4048 [19243] malloc: reused_arena can pick an arena on the free list, leading
4049 to an assertion failure and reference count corruption
4050 [19253] time: tzset() ineffective when temporary TZ did not include DST
4052 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4053 [19270] math: [hppa] Shared libm missing __isnanl
4054 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4055 MAP_HUGETLB and MAP_STACK defines
4056 [19313] nptl: Wrong __cpu_mask for x32
4057 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4058 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4059 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4060 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4061 [19363] time: x32: times() return value wrongly truncates/sign extends
4063 [19367] dynamic-link: Improve branch prediction on Silvermont
4064 [19369] network: Default domain name not reset by res_ninit when "search"
4065 / "domain" entry is removed from resolv.conf
4066 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4068 [19385] localedata: bg_BG: time separator should be colon, not comma
4069 [19408] libc: linux personality syscall wrapper may erroneously return an
4070 error on 32-bit architectures
4071 [19415] libc: dladdr returns wrong names on hppa
4072 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4073 IBM905, IBM907, and IBM909
4074 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4075 [19443] build: build failures with -DDEBUG
4076 [19451] build: Make check fails on test-double-vlen2
4077 [19462] libc: Glibc failed to build with -Os
4078 [19465] math: Wrong code with -Os
4079 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4081 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4083 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4084 [19486] math: S390: Math tests fail with "Exception Inexact set".
4085 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4086 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4088 [19590] math: Fail to build shared objects that use libmvec.so functions.
4092 * The following bugs are resolved with this release:
4094 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4095 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4096 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4097 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4098 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4099 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4100 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4101 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4102 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4103 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4104 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4105 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4106 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4107 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4108 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4109 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4110 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4111 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4112 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4113 18657, 18676, 18694, 18696, 18887.
4115 * Cache information can be queried via sysconf() function on s390 e.g. with
4116 _SC_LEVEL1_ICACHE_SIZE as argument.
4118 * A buffer overflow in gethostbyname_r and related functions performing DNS
4119 requests has been fixed. If the NSS functions were called with a
4120 misaligned buffer, the buffer length change due to pointer alignment was
4121 not taken into account. This could result in application crashes or,
4122 potentially arbitrary code execution, using crafted, but syntactically
4123 valid DNS responses. (CVE-2015-1781)
4125 * The time zone file parser has been made more robust against crafted time
4126 zone files, avoiding heap buffer overflows related to the processing of
4127 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4128 large time zone data files. Overly long time zone specifiers in the TZ
4129 variable no longer result in stack overflows and crashes.
4131 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4132 for LD and GD on x86 and x86-64, has been implemented. You will need
4133 binutils-2.24 or later to enable this optimization.
4135 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4136 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4137 Hat). These updates cause user visible changes, such as the fix for bug
4140 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4141 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4142 condition in some applications.
4144 * Added vector math library named libmvec with the following vectorized x86_64
4145 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4147 The library can be disabled with --disable-mathvec. Use of the functions is
4148 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4149 Shared library libmvec.so is linked in as needed when using -lm (no need to
4150 specify -lmvec explicitly for not static builds).
4151 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4153 * A new fmemopen implementation has been added with the goal of POSIX
4154 compliance. The new implementation fixes the following long-standing
4155 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4156 old implementation is still present for use be by existing binaries.
4158 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4159 releases. It has been fixed to match 2.19 and older, but binaries built
4160 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4162 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4163 Contributed by Roland McGrath (Google).
4165 * The header <regexp.h> is deprecated, and will be removed in a future
4166 release. Use of this header will trigger a deprecation warning.
4167 Application developers should update their code to use <regex.h> instead.
4169 This header was formerly part of SUS, but was deprecated in 1994 and
4170 removed from the standard in 2001. Also, the glibc implementation
4171 leaks memory. See BZ#18681 for more details.
4175 * The following bugs are resolved with this release:
4177 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4178 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4179 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4180 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4181 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4182 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4183 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4184 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4185 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4186 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4189 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4190 too little memory for the to-be-scanned arguments and overflow the
4191 allocated buffer. The implementation now correctly computes the required
4192 buffer size when using malloc, and switches to malloc from alloca as
4195 * A new semaphore algorithm has been implemented in generic C code for all
4196 machines. Previous custom assembly implementations of semaphore were
4197 difficult to reason about or ensure that they were safe. The new version
4198 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4199 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4200 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4202 * Port to Altera Nios II has been contributed by Mentor Graphics.
4204 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4205 implementations for powerpc64/powerpc64le.
4206 Implemented by Adhemerval Zanella (IBM).
4208 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4209 and powerpc64le. This may improve lock scaling of existing programs on
4210 HTM capable systems. The lock elision code is only enabled with
4211 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4212 powerpc will issue a transaction abort on every syscall to avoid side
4213 effects being visible outside transactions.
4215 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4216 AArch64. Contributed by ARM Ltd.
4218 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4220 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4221 under certain input conditions resulting in the execution of a shell for
4222 command substitution when the application did not request it. The
4223 implementation now checks WRDE_NOCMD immediately before executing the
4224 shell and returns the error WRDE_CMDSUB as expected.
4226 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4227 processing format strings with a large number of format specifiers.
4229 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4230 infinite loop if the DNS response contained a PTR record of an unexpected
4233 * The minimum GCC version that can be used to build this version of the GNU
4234 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4235 still be used to compile programs using the GNU C Library.
4237 * The GNU C Library is now built with -Werror by default. This can be
4238 disabled by configuring with --disable-werror.
4240 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4242 * The obsolete sigvec function has been removed. This was the original
4243 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4244 programs have been using instead for about 25 years. Of course, ABI
4245 compatibility for old binaries using sigvec remains intact.
4247 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4248 with newer versions of bison.
4250 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4251 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4252 registers overlay two consecutive single-precision registers. MIPS32R2
4253 introduced a new FPU mode (FR=1) where double-precision registers extend the
4254 corresponding single-precision registers which is incompatible with the
4255 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4256 require the use of FR=1 making a transition necessary. New o32 ABI
4257 extensions enable users to migrate over time from the original o32 ABI
4258 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4259 tracks the ABI of any loaded object and verifies that new objects are
4260 compatible. Mode transitions will also be requested as required and
4261 unsupportable objects will be rejected. The ABI checks include both soft and
4262 hard float ABIs for o32, n32 and n64.
4264 GCC 5 with GNU binutils 2.25 onwards:
4265 It is strongly recommended that all o32 system libraries are built using the
4266 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4267 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4268 compiler using --with-fp-32=xx to set this by default.
4272 * The following bugs are resolved with this release:
4274 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4275 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4276 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4277 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4278 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4279 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4280 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4281 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4282 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4283 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4284 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4285 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4286 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4287 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4288 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4290 * Reverted change of ABI data structures for s390 and s390x:
4291 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4292 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4293 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4294 are preserved pointing straight to the same implementation as the old ones.
4295 Given that, new callers will simply provide a too-big buffer to these
4296 functions. Any applications/libraries out there that embed jmp_buf or
4297 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4298 against 2.19 headers will have to rebuilt again. This is necessary in any
4299 case to revert the breakage in their ABI caused by the glibc change.
4301 * Support for file description locks is added to systems running the
4302 Linux kernel. The standard file locking interfaces are extended to
4303 operate on file descriptions, not file descriptors, via the use of
4304 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4305 are associated with an open file instead of a process.
4307 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4309 * The minimum Linux kernel version that this version of the GNU C Library
4310 can be used with is 2.6.32.
4312 * Running the testsuite no longer terminates as soon as a test fails.
4313 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4314 with PASS or FAIL lines for individual tests. A summary of the results is
4315 printed, including a list of failing lists, and "make check" exits with
4316 error status if there were any unexpected failures. "make check
4317 stop-on-test-failure=y" may be used to keep the old behavior.
4319 * The am33 port, which had not worked for several years, has been removed
4322 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4323 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4324 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4325 conflicted with POSIX (support for which was removed in 2.19), the
4326 interfaces those macros enabled remain available when compiling with
4327 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4328 test macros defined.
4330 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4332 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4333 This may improve lock scaling of existing programs on TX capable systems.
4334 The lock elision code is only built with --enable-lock-elision=yes and
4335 then requires a GCC version supporting the TX builtins. With lock elision
4336 default mutexes are elided via __builtin_tbegin, if the cpu supports
4337 transactions. By default lock elision is not enabled and the elision code
4340 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4341 copy the path argument. This allowed programs to cause posix_spawn to
4342 deference a dangling pointer, or use an unexpected pathname argument if
4343 the string was modified after the posix_spawn_file_actions_addopen
4346 * All supported architectures now use the main glibc sysdeps directory
4347 instead of some being in a separate "ports" directory (which was
4348 distributed separately before glibc 2.17).
4350 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4351 On configurations that support it (all Linux configurations), it's now
4352 used regardless of the --enable-add-ons switch to configure. It is no
4353 longer possible to build such configurations without pthreads support.
4355 * Locale names, including those obtained from environment variables (LANG
4356 and the LC_* variables), are more tightly checked for proper syntax.
4357 setlocale will now fail (with EINVAL) for locale names that are overly
4358 long, contain slashes without starting with a slash, or contain ".." path
4359 components. (CVE-2014-0475) Previously, some valid locale names were
4360 silently replaced with the "C" locale when running in AT_SECURE mode
4361 (e.g., in a SUID program). This is no longer necessary because of the
4364 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4365 with application code using Intel MPX instructions. (With all previous
4366 versions, the MPX register state could be clobbered when making calls
4367 into or out of a shared library.) Note that while the new dynamic
4368 linker is compatible with all known x86 hardware whether or not it
4369 supports Intel MPX, some x86 instruction-set emulators might fail to
4370 handle the new instruction encodings. This is known to affect Valgrind
4371 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4372 release), and might affect other tools that do instruction emulation.
4374 * Support for loadable gconv transliteration modules has been removed.
4375 The support for transliteration modules has been non-functional for
4376 over a decade, and the removal is prompted by security defects. The
4377 normal gconv conversion modules are still supported. Transliteration
4378 with //TRANSLIT is still possible, and the //IGNORE specifier
4379 continues to be supported. (CVE-2014-5119)
4381 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4382 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4383 resulting a denial-of-service security vulnerability in applications which
4384 use functions related to iconv. (CVE-2014-6040)
4388 * The following bugs are resolved with this release:
4390 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4391 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4392 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4393 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4394 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4395 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4396 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4397 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4398 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4399 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4400 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4401 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4402 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4403 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4404 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4405 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4406 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4407 16431, 16453, 16474, 16506, 16510, 16529
4409 * Slovenian translations for glibc messages have been contributed by the
4410 Translation Project's Slovenian team of translators.
4412 * The public headers no longer use __unused nor __block. This change is to
4413 support compiling programs that are derived from BSD sources and use
4414 __unused internally, and to support compiling with Clang's -fblock
4415 extension which uses __block.
4417 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4418 large collation sequences to optimize multiple passes. This cache
4419 computation may overflow for large collation sequences and may cause a
4420 stack or buffer overflow. This is now fixed to use a slower algorithm
4421 which does not use a cache if there is an integer overflow.
4423 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4424 rules for large collation sequences to optimize multiple passes and falls
4425 back to alloca if malloc fails, resulting in a possible stack overflow.
4426 The implementation now falls back to an uncached collation sequence lookup
4429 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4430 initialized for static applications resulting in the security feature
4431 being disabled. The pointer guard is now correctly initialized to a
4432 random value for static applications. Existing static applications need
4433 to be recompiled to take advantage of the fix (bug 15754).
4435 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4436 to the d_name member of struct dirent, or omit the terminating NUL
4437 character. (Bugzilla #14699).
4439 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4440 aligned_alloc functions could allocate too few bytes or corrupt the
4441 heap when passed very large allocation size values (Bugzilla #15855,
4444 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4445 for AF_INET6 has been fixed (Bugzilla #16072).
4447 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4448 pap_CW, quz_PE, the_NP.
4450 * Substantially revised locales: gd_GB, ht_HT
4452 * The LC_ADDRESS field was updated to support country_car for almost all
4455 * ISO 1427 definitions were updated.
4457 * ISO 3166 definitions were updated.
4459 * The localedef utility now supports --big-endian and --little-endian
4460 command-line options to generate locales for a different system from that
4461 for which the C library was built.
4463 * Binary locale files now only depend on the endianness of the system for
4464 which they are generated and not on other properties of that system. As a
4465 consequence, binary files generated with new localedef may be incompatible
4466 with old versions of the GNU C Library, and binary files generated with
4467 old localedef may be incompatible with this version of the GNU C Library,
4468 in the following circumstances:
4470 + Locale files may be incompatible on m68k systems.
4472 + Locale archive files (but not separate files for individual locales) may
4473 be incompatible on systems where plain "char" is signed.
4475 * The configure option --disable-versioning has been removed. Builds with
4476 --disable-versioning had not worked for several years.
4478 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4479 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4481 * SystemTap probes for malloc have been introduced.
4483 * SystemTap probes for slow multiple precision fallback paths of
4484 transcendental functions have been introduced.
4486 * Support for powerpc64le has been added.
4488 * The soft-float powerpc port now supports e500 processors.
4490 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4492 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4493 set of header declarations that are enabled by default, even when other
4494 feature test macros or compiler options such as -std=c99 would otherwise
4495 disable some of those declarations.
4497 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4498 conflict with POSIX. The libbsd-compat library (which was a dummy library
4499 that did nothing) has also been removed.
4501 * Preliminary documentation about Multi-Thread, Async-Signal and
4502 Async-Cancel Safety has been added.
4504 * Change of ABI data structures for s390 and s390x:
4505 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4506 allow for future hardware extensions. All library functions that accept or
4507 return these structures were versioned in order to provide backwards
4508 compatibility with existing code. However, not all cases can be handled
4509 with interface versioning. If an application embeds either structure into
4510 another structure and that structure is passed to another compilation unit
4511 which expects the newer larger-sized object then any access to the new
4512 fields will result in undefined behaviour. Similarly any access to fields
4513 that were moved by the enlarging of the structures will cause undefined
4514 behaviour. To fix the undefined behaviour all objects that are part of the
4515 final in-memory image must agree on the size of structures, and this may
4516 require recompilation.
4520 * The following bugs are resolved with this release:
4522 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4523 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4524 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4525 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4526 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4527 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4528 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4529 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4530 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4531 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4532 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4533 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4534 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4537 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4538 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4539 Distributions can re-enable building and using pt_chown via the new configure
4540 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4541 considerable security risks and should only be used if the distribution
4542 understands and accepts the risks.
4544 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4547 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4548 fixed (Bugzilla #15330).
4550 * Add support for calling C++11 thread_local object destructors on thread
4551 and program exit. This needs compiler support for offloading C++11
4552 destructor calls to glibc.
4554 * Improved worst case performance of libm functions with double inputs and
4557 * Support for priority inherited mutexes in pthread condition variables on
4558 non-x86 architectures.
4560 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4562 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4564 * Optimized string functions for ARM. Implemented by Will Newton and
4567 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4569 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4572 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4573 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4575 * Added a benchmark framework to track performance of functions in glibc.
4577 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4578 It is based on draft TS 18661 and currently enabled as a GNU extension.
4580 * On Linux, the clock function now uses the clock_gettime system call
4581 for improved precision, rather than old times system call.
4583 * Added support for version-3 tz format files. This is needed when using
4584 the tz database release 2013e or later, and affects a few unusual cases --
4585 currently only TZ='America/Godthab' for time stamps after 2037.
4587 * Added new API functions pthread_getattr_default_np and
4588 pthread_setattr_default_np to get and set the default pthread
4589 attributes of a process.
4591 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4592 This may improve lock scaling of existing programs on TSX capable systems.
4593 When the --enable-lock-elision=yes parameter is specified at configure
4594 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4597 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4598 availability). Implemented by Ryan S. Arnold.
4600 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4604 * The following bugs are resolved with this release:
4606 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4607 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4608 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4609 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4610 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4611 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4612 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4613 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4614 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4615 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4616 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4617 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4618 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4619 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4620 14879, 14889, 14893, 14898, 14914.
4622 * Optimization of memcpy for MIPS.
4624 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4625 EMFILE has been fixed (Bugzilla #14889).
4627 * The add-on ports collection is now distributed in the "ports" subdirectory
4628 of the main GNU C Library distribution, rather than separately.
4630 * Port to ARM AArch64 contributed by Linaro.
4632 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4633 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4635 Implemented by Andreas Krebbel.
4637 * The new function secure_getenv allows secure access to the environment,
4638 returning NULL if running in a SUID/SGID process. This function replaces
4639 the internal function __secure_getenv.
4641 * SystemTap static probes have been added into the dynamic linker.
4642 Implemented by Gary Benson.
4644 * Optimizations of string functions strstr, strcasestr and memmem.
4645 Implemented by Maxim Kuvyrkov.
4647 * The minimum Linux kernel version that this version of the GNU C Library
4648 can be used with is 2.6.16.
4650 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4651 powerpc POWER7. Implemented by Will Schmidt.
4653 * New configure option --disable-nscd builds the C library such that it
4654 never attempts to contact the Name Service Caching Daemon (nscd).
4655 New configure option --disable-build-nscd avoids building nscd itself;
4656 this is the default if --disable-nscd is used.
4658 * Improved support for cross-compilation, including cross-testing and
4659 bootstrap builds without a previously built glibc.
4661 * Several testsuite tests are now able to test multiple IFUNC variants of an
4662 interface, rather than just testing the one that would be chooen by
4665 * New configure options --with-bugurl and --with-pkgversion, for
4666 distributors to use to embed their bug-reporting and package version
4667 information in --help and --version output.
4669 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4670 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4671 allows creation of chroots without the procfs mounted on /proc.
4673 * The `crypt' function now fails if passed salt bytes that violate the
4674 specification for those values. On Linux, the `crypt' function will
4675 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4676 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4677 when the mode is enabled.
4679 * The `clock_*' suite of functions (declared in <time.h>) is now available
4680 directly in the main C library. Previously it was necessary to link with
4681 -lrt to use these functions. This change has the effect that a
4682 single-threaded program that uses a function such as `clock_gettime' (and
4683 is not linked with -lrt) will no longer implicitly load the pthreads
4684 library at runtime and so will not suffer the overheads associated with
4685 multi-thread support in other code such as the C++ runtime library.
4687 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4692 * The following bugs are resolved with this release:
4694 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4695 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4696 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4697 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4698 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4699 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4700 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4701 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4702 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4703 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4704 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4705 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4706 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4707 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4708 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4709 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4710 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4711 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4712 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4713 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4714 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4715 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4718 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4719 configuring glibc with:
4720 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4721 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4722 Implemented by H.J. Lu.
4726 + define static_assert
4728 + do not declare gets
4730 + declare at_quick_exit and quick_exit also for ISO C11
4732 + aligned_alloc. NB: The code is deliberately allows the size parameter
4733 to not be a multiple of the alignment. This is a moronic requirement
4734 in the standard but it is only a requirement on the caller, not the
4737 + timespec_get added
4739 + uchar.h support added
4741 + CMPLX, CMPLXF, CMPLXL added
4743 Implemented by Ulrich Drepper.
4745 * Support for the IA-64 has been moved to ports.
4747 * Remove support for anything but ELF binary format
4749 * Checking versions of poll, ppoll added.
4750 Implemented by Ulrich Drepper.
4752 * More generic and 64-bit performance optimizations to math functions.
4753 Implemented by Ulrich Drepper.
4755 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4756 headers and functions available at compile time as they were before
4757 version 2.14. This option will be removed at some time in the future
4758 after the TI-RPC library becomes fully sufficient for the needs of
4759 existing applications.
4761 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4762 Note that glibc is not expected to work with any Linux kernel version
4765 * New header <sys/auxv.h> and function getauxval allowing easy access to
4766 the AT_* key-value pairs passed from the Linux kernel. The header also
4767 defines the HWCAP_* bits associated with the AT_HWCAP key.
4769 * New locales: mag_IN
4771 * New configure option --enable-systemtap builds SystemTap static probes
4772 into libc for setjmp and longjmp and into libpthread for various operations.
4773 So far the setjmp/longjmp probes and some of the libpthread probes are
4774 provided only for i*86 and x86_64.
4775 Implemented by Roland McGrath and Rayson Ho.
4777 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4779 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4782 * More optimized functions for SPARC. Implemented by David S. Miller.
4784 * Improved support for cross-compilation, especially bootstrap builds
4785 without a previously built glibc.
4787 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4788 Chris Metcalf from Tilera.
4790 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4791 now supported for ARM processors.
4793 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4794 as the name of the dynamic linker, to distinguish it from the
4795 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4797 * Support for CRIS has been removed from ports.
4799 * A new class of installed header has been documented for low-level
4800 platform-specific functionality. PowerPC added the first instance with a
4801 function to provide time base register access. Contributed by Tulio
4802 Magno Quites Machado Filho.
4804 * ix86 configurations now install header files that are consistent with
4805 what x86-64 configurations install. These same header files can be used
4806 for -m32, -m64, or -mx32 builds.
4807 Contributed by H.J. Lu.
4809 * Math library bug fixes. A thorough audit of all open math library bugs was
4810 conducted by Joseph Myers. Significant progress was made on many math
4811 library bugs resulting in more accurate exceptions and function results.
4812 Many thanks to all those that contributed including Andreas Jaeger for his
4813 patch review and work on the x87 trigonometric instruction issues.
4815 * Timezone data is no longer installed. Timezone-related binaries and scripts
4816 will continue to be installed. Users should obtain their timezone data from
4817 their distribution provider or from the tzdata package at
4818 <ftp://munnari.oz.au/pub/>.
4822 * The following bugs are resolved with this release:
4824 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4825 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4826 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4827 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4828 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4829 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4830 13484, 13506, 13515, 13523, 13524, 13538, 13540
4832 * New program pldd to list loaded object of a process
4833 Implemented by Ulrich Drepper.
4835 * Add nss_db support back to glibc. No more dependency on Berkeley db
4836 and support for initgroups lookups.
4837 Implemented by Ulrich Drepper.
4839 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4840 Contributed by HJ Lu.
4842 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4843 Contributed by HJ Lu.
4845 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4846 on x86-32 and x86-64.
4847 Contributed by Liubov Dmitrieva.
4849 * Optimized strchr and strrchr for SSE on x86-32.
4850 Contributed by Liubov Dmitrieva.
4852 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4853 for x86-64 and x86-32.
4854 Contributed by Liubov Dmitrieva.
4856 * New interfaces: scandirat, scandirat64
4857 Implemented by Ulrich Drepper.
4859 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4860 Implemented by Ulrich Drepper.
4862 * nscd now also caches the netgroup database.
4863 Implemented by Ulrich Drepper.
4865 * Integrate libm with gcc's -ffinite-math-only option.
4866 Implemented by Ulrich Drepper.
4868 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4869 to math functions. Implemented by Ulrich Drepper.
4871 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4872 Implemented by Ulrich Drepper.
4874 * New Linux interfaces: process_vm_readv, process_vm_writev
4876 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4877 Implemented by Ulrich Drepper.
4879 * Optimized nearbyint and strcasecmp for PPC.
4880 Implemented by Adhemerval Zanella.
4882 * New locales: bho_IN, unm_US, es_CU, ta_LK
4886 * The following bugs are resolved with this release:
4888 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4889 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4890 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4891 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4892 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
4893 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
4894 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
4895 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
4896 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
4897 12795, 12811, 12813, 12814, 12841
4899 * The RPC implementation in libc is obsoleted. Old programs keep working
4900 but new programs cannot be linked with the routines in libc anymore.
4901 Programs in need of RPC functionality must be linked against TI-RPC.
4902 The TI-RPC implementation is IPv6 enabled and there are other benefits.
4904 Visible changes of this change include (obviously) the inability to link
4905 programs using RPC functions without referencing the TI-RPC library and the
4906 removal of the RPC headers from the glibc headers.
4907 Implemented by Ulrich Drepper.
4909 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
4910 syncfs, setns, sendmmsg
4912 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
4913 yue_HK, lij_IT, mhr_RU
4915 * New encodings: CP770, CP771, CP772, CP773, CP774
4917 * New program sotruss to trace calls through PLTs
4918 Implemented by Ulrich Drepper.
4920 * The malloc hook implementation is marked deprecated and will be removed
4921 from the default implementation in the next version. The design never
4922 worked ever since the introduction of threads. Even programs which do
4923 not create threads themselves can use multiple threads created internally.
4927 * The following bugs are resolved with this release:
4929 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
4930 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
4931 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
4932 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
4935 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
4937 * POWER7 optimizations: memset, memcmp, strncmp
4939 * New optimized string functions for x86-64: strnlen (SSE2),
4940 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
4941 Implemented by Ulrich Drepper.
4945 * The following bugs are resolved with this release:
4947 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
4948 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
4949 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
4950 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
4951 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
4952 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
4953 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
4954 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
4956 * New interfaces: pthread_getname_np, pthread_setname_np
4958 * New Linux interface: recvmmsg
4960 * STT_GNU_IFUNC implemented for Sparc by David Miller.
4962 * The dynamic linker now recognizes supported ABI versions from the
4963 EI_ABIVERSION field in the ELF header.
4964 Implemented by Ulrich Drepper.
4966 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
4967 will not be used to fill in password fields in the passwd.byname replies.
4968 Instead it is used to synthesize the shadow.byname table, should it be
4969 missing. This is a useful mode in some installations involving Solaris.
4970 Implemented by Ulrich Drepper.
4972 * New locales: kok_IN, sq_MK, cv_RU
4976 * The following bugs are resolved with this release:
4978 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
4979 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
4980 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
4981 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
4982 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
4983 10789, 10817, 10823, 10840, 10847
4985 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
4987 Implemented by Ulrich Drepper.
4989 * Checking version of longjmp added that fails if an uninitialized stack
4990 frame would be created. Implemented by Ulrich Drepper.
4992 * STT_GNU_IFUNC is now supported in static executables.
4993 Implemented by H.J. Lu.
4995 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
4997 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
4998 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
4999 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5000 Contributed by H.J. Lu.
5002 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5003 Implemented by Ulrich Drepper.
5005 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5007 Contributed by H.J. Lu.
5009 * Support for fma instruction in AVX on x86-64.
5010 Implemented by H.J. Lu and Ulrich Drepper.
5012 * AVX support in x86-64 auditing support in ld.so.
5013 Implemented by H.J. Lu.
5015 * STB_GNU_UNIQUE support added.
5016 Implemented by Ulrich Drepper.
5018 * Implement second fallback mode for optimized DNS lookup for even more
5019 broken environments. If two requests from the same port are not
5020 handled correctly close the socket and open a new one before sending
5021 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5022 can be used to select this mode right away, instead of rediscovering the
5023 necessity is every process again.
5024 Implemented by Ulrich Drepper.
5026 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5027 Implemented by Adam Tkac.
5029 * Optimized iconv conversions for S390x.
5030 Implemented by Andreas Krebbel.
5032 * Using condvars with PI mutexes is now more efficient due to kernel
5033 support for requeueing to PI futexes. NPTL support added for x86-64.
5034 Implemented by Ulrich Drepper.
5036 * New locales: ps_AF, my_MM
5040 * The following bugs are resolved with this release:
5042 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5043 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5044 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5045 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5046 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5048 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5049 Implemented by Ulrich Drepper.
5051 * New Linux interfaces: accept4, fallocate, fallocate64.
5052 Implemented by Ulrich Drepper.
5054 * Correct declarations of string function when used in C++ code. This
5055 could lead to compile errors for invalid C++ code.
5057 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5060 * New POSIX 2008 interface: psiginfo
5061 Implemented by Ulrich Drepper.
5063 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5064 Implemented by Ulrich Drepper.
5066 * Support for selecting between multiple function definitions at runtime
5067 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5069 * The libcrypt library can now use the hash function implementations in
5070 NSS. Implemented by Ulrich Drepper.
5072 * The malloc implementation can be compiled to be less memory efficient
5073 but higher performing in multi-threaded programs.
5074 Implemented by Ulrich Drepper.
5076 * New locales: nan_TW@latin, ks_IN
5078 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5079 Implemented by Ulrich Drepper.
5081 * Extended printf hook support. It is possible to use user-defined types
5082 and extend existing format specifiers.
5083 Implemented by Ulrich Drepper.
5085 * Handling for group shadow files has been added.
5086 Implemented by Ulrich Drepper.
5088 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5089 servers (the case, e.g., for some people using the built-in DNS
5090 server in ADSL modems/routers). There is a once-per-process timeout
5091 in case of a broken server. To avoid it, users can run nscd or put
5092 'options single-request' in /etc/resolv.conf.
5093 Implemented by Ulrich Drepper.
5097 * The following bugs are resolved with this release:
5099 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5100 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5101 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5102 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5103 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5105 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5106 up at the same time. Implemented by Ulrich Drepper.
5108 * TLS descriptors for LD and GD on x86 and x86-64.
5109 Implemented by Alexandre Oliva.
5111 * getaddrinfo now handles DCCP and UDPlite.
5112 Implemented by Ulrich Drepper.
5114 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5115 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5116 Implemented by Ulrich Drepper.
5118 * New implementation of memmem, strstr, and strcasestr which is O(n).
5119 Implemented by Eric Blake.
5121 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5123 * Implement "e" option for popen to open file descriptor with the
5124 close-on-exec flag set. Implemented by Ulrich Drepper.
5126 * Implement "b" mode for fmemopen. In this mode writes writes don't
5127 implicitly add a NUL byte and seeks from the end of the buffer really
5128 use the buffer end, not the string length as the basis.
5129 Implemented by Ulrich Drepper.
5131 * Many functions, exported and internal, now atomically set the close-on-exec
5132 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5134 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5136 Implemented by Pravin Satpute.
5138 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5142 * The following bugs are resolved with this release:
5144 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5145 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5146 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5147 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5148 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5149 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5150 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5152 * New locales: bo_CN, bo_IN, shs_CA.
5154 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5156 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5157 Implemented by Pravin Satpute.
5159 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5161 * nscd caches now all timeouts for DNS entries
5162 Implemented by Ulrich Drepper.
5164 * nscd is more efficient and wakes up less often.
5165 Implemented by Ulrich Drepper.
5167 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5168 vdprintf, and obstack_vprintf.
5169 Implemented by Jakub Jelinek.
5171 * Faster memset for x86-64.
5172 Implemented by Harsha Jagasia and H.J. Lu.
5174 * Faster memcpy on x86.
5175 Implemented by Ulrich Drepper.
5177 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5178 Implemented by Ulrich Drepper.
5180 * Faster sqrt and sqrtf implemention for some PPC variants.
5181 Implemented by Steven Munroe.
5185 * The following bugs are resolved with this release:
5187 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5188 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5189 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5190 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5191 5071, 5103, 5104, 5112, 5113, 5184, 5186
5193 * More checking functions: fread, fread_unlocked, open*, mq_open.
5194 Implemented by Jakub Jelinek and Ulrich Drepper.
5196 * Extend fortification to C++. Implemented by Jakub Jelinek.
5198 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5199 by not recognizing 'a' as a modifier when those specs are requested.
5200 Implemented by Jakub Jelinek.
5202 * PPC optimizations to math and string functions.
5203 Implemented by Steven Munroe.
5205 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5206 options to be passed. Implemented by Ulrich Drepper.
5208 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5210 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5211 Implemented by Ulrich Drepper.
5213 * Handle private futexes in the NPTL implementation.
5214 Implemented by Jakub Jelinek and Ulrich Drepper.
5216 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5217 Implemented by Roland McGrath and Ulrich Drepper.
5219 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5221 * SHA-256 and SHA-512 based password encryption.
5222 Implemented by Ulrich Drepper.
5224 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5225 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5228 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5229 Implemented by Ulrich Drepper.
5233 * The following bugs are resolved with this release:
5235 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5236 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5237 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5238 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5239 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5240 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5241 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5244 * New Linux interfaces: epoll_pwait, sched_getcpu.
5246 * New generic interfaces: strerror_l.
5248 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5252 * The following bugs are resolved with this release:
5254 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5255 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5256 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5257 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5258 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5259 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5260 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5261 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5262 3225, 3251, 3252, 3253, 3273
5264 * For Linux, the sorting of addresses returned by getaddrinfo now also
5265 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5266 Implemented by Ulrich Drepper.
5268 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5269 Implemented by Ulrich Drepper.
5271 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5273 * New iconv module for MIK. Contributed by Alexander Shopov.
5275 * For sites with broken group and/or passwd database, the auto-propagate
5276 option of nscd can prevent creating ID lookup entries from the results
5277 of a name lookup and vice versa. This usually is no problem but some
5278 site might have problems with the default behavior.
5279 Implemented by Ulrich Drepper.
5281 * Iterating over entire database in NIS can be slow. With the
5282 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5283 to trade time for memory. The entire database will be read at once.
5284 Implemented by Ulrich Drepper.
5286 * The interfaces introduced in RFC 3542 have been implemented by
5289 * Support for the new ELF hash table format was added by Ulrich Drepper.
5291 * Support for priority inheritance mutexes added by Jakub Jelinek and
5294 * Support for priority protected mutexes added by Jakub Jelinek.
5296 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5297 or_IN, csb_PL, fy_NL, sr_ME.
5301 * More overflow detection functions.
5303 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5304 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5306 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5307 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5308 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5309 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5310 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5311 by Masahide Washizawa.
5313 * It is now possible to install audit libraries for the dynamic linker using
5314 LD_AUDIT. Implemented by Ulrich Drepper.
5316 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5317 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5318 For a libc and libpthread that works well on Linux 2.4 kernels, we
5319 recommend using the stable 2.3 branch.
5321 * The new function open_wmemstream acts like open_memstream,
5322 but uses a wchar_t wide character buffer.
5324 * The new function ppoll is an improved version of poll, similar to pselect.
5326 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5327 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5328 renameat, unlinkat, linkat, symlinkat, readlinkat.
5330 * New Linux kernel system calls: unshare,
5331 inotify_init, inotify_add_watch, inotify_rm_watch.
5333 * The euidaccess function is now also known by the alias eaccess,
5334 for compatibility with some other systems.
5336 * Timezone data updated to 2006b version.
5340 * The following bugs are resolved with this release:
5342 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5343 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5344 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5345 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5346 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5347 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5349 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5351 * As of this release, GCC 4 can be used to compile the C Library.
5353 * Timezone data updated to 2005m version.
5357 * The following bugs are resolved with this release:
5359 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5360 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5361 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5362 777, 787, 821, 822, 823, 825
5364 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5368 * Support for RFC 3678. Real implementations exist only for Linux so far.
5369 Implemented by Ulrich Drepper.
5371 * nscd can now cache entries persistently. Expiring entries are reloaded.
5372 For speedups the cache can be shared in memory with client processes.
5373 Implemented by Ulrich Drepper.
5375 * nscd can now perform SELinux checks.
5376 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5378 * getaddrinfo queries are now cached. Canonical name lookup is performed
5380 Implemented by Ulrich Drepper.
5382 * The nothrow function attribute is used when headers are used by gcc when
5383 compiling C code. This can avoid significant amounts of exception
5386 * The malloc functions perform more error checking and are stricter when
5387 it comes to reacting on errors. The default action is to terminate
5388 the process after showing an error message. Implemented by Ulrich Drepper.
5390 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5391 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5393 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5394 namespaces using the new function dlmopen(). This feature is of course,
5395 like most other dynamic loading functionality, not available in statically
5396 linked applications. Implemented by Ulrich Drepper.
5398 * Low-overhead boundary checking variants of string and some stdio functions
5399 were added. These are to be used in conjunction with a gcc patch by
5400 Jakub Jelinek which adds calls to these functions if possible.
5401 Implemented by Jakub Jelinek and Ulrich Drepper.
5403 * Old code for several operating systems and machine architectures that
5404 have not been in working condition in a long time have been removed from
5405 the main source tree maintained by the GNU C Library's maintainers.
5406 These files are now reside in the separate `ports' source module
5407 that is usable as an add-on when building the library.
5411 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5412 interrogate the dynamic linker, compatible with the Solaris interface.
5414 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5415 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5417 * getifaddrs now uses the netlink interface on Linux to get its information.
5418 Implemented by Thorsten Kukuk.
5420 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5421 Implemented by Ulrich Drepper.
5423 * support for non-executable stacks on x86 has been added. Changes mostly
5426 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5429 * getaddrinfo now performs destination address selection according to
5434 * Thread-safe interfaces for many functions that access locale data
5435 were added in version 2.3, but these features were omitted from NEWS.
5436 Many functions have variants with an `_l' suffix that take a `locale_t'
5437 object as a parameter rather than consulting the current locale.
5438 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5439 create and maintain `locale_t' objects. Additionally, the new function
5440 `uselocale' sets "the current locale" (as used by functions not so
5441 parameterized) set for an individual thread. These features were added
5442 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5444 * The functions getresuid, getresgid, setresuid, and setresgid, which
5445 have long been available on Linux, are now declared in <unistd.h>
5446 and are now also available on the Hurd.
5448 * ELF thread-local storage support (TLS) now works on x86-64.
5450 * The new dynamic string token $LIB is expanded in shared library names.
5451 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5453 * Aldy Hernandez contributed complete software floating point support for
5454 PowerPC machines with no FPU.
5456 * fexecve is implemented on Linux.
5458 * The `btowc' function should work at least twice as fast due to
5459 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5461 * With approriate thread add-ons cancelable functions are now implemented
5462 in libc.so as well. No need to call the function in libpthread. This
5463 change allowed to finally disable the incorrect and expensive handling
5464 of weak definition in ld.so.
5466 * Yet more PLT entries in libc.so have been removed. We finally arrived
5467 at the bare minimum. Startup times improved appropriately.
5469 * Support for the new Linux/x86 system call interface was added. The
5470 AT_SYSINFO auxiliary vector entry is recognized and handled.
5474 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5477 * iconv (the program and the interface) now accepts empty names (excluding
5478 options like //TRANSLIT) to mean "use charset of current locale".
5480 * localedef can now transliterate characters in strings which are not in
5481 the provided charmap. The information from the input locale is used.
5483 * Prelinking support was added for ELF targets. This requires additional
5484 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5486 * Read-only stdio streams now use mmap to speed up operation by eliminating
5487 copying and buffer underflows. To use add 'm' to the mode string of
5488 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5490 * The malloc functions were completely rewritten by Wolfram Gloger based
5491 on Doug Lea's malloc-2.7.0.c.
5493 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5494 implementation of regex.
5496 * Bruno Haible upgraded the iconv and locale implementation to support
5499 * Contents of the LC_* and LANG environment variables in the CEN style are
5500 not recognized anymore. It never was used. Change by Ulrich Drepper.
5502 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5503 thread-local storage (TLS) ABI on some platforms.
5504 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5506 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5507 EUC-JISX0213, and TSCII.
5509 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5510 BSD-compatible interface for getting all network interface addresses.
5511 Implementation for IPv4 by Roland McGrath.
5513 * Loading of locale data is faster due to the introduction of a locale
5514 archive. Implemented by Roland McGrath and Ulrich Drepper.
5516 * Startup times are significantly reduced by not using exported functions
5517 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5520 * Steven Munroe contributed a port to PowerPC64/Linux.
5524 * The Hurd now uses the GNU libio implementation of stdio rather than the
5525 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5527 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5528 with the same behavior as the Linux system call of the same name.
5532 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5533 128-bit long double format.
5535 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5536 IBM1161, and IBM1162 charsets.
5538 * Andreas Jaeger contributed a port to x86-64/Linux.
5540 * Peter Bruin contributed a port to PowerPC/Hurd.
5542 * libc functions using I/O streams now can handle wide-oriented streams
5545 * optimizations in the dynamic linker. Binaries created by recent binutils
5546 versions start up quicker due to reduced time spent on relocations.
5548 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5552 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5553 asinh, atanh, j0 for the 128-bit long double format.
5555 * Bruno Haible updated all the code handling Unicode in some form to
5556 support Unicode 3.1.
5558 * Speed of regex for single-byte locales is back to previous levels.
5559 Patch by Isamu Hasegawa.
5561 * Alpha, SPARC, and IA-64 now also using floating stacks.
5563 * Startup time of internationalized applications greatly improved through
5564 iconv cache. Use iconvconfig to generate the cache file.
5565 Contributed by Ulrich Drepper.
5567 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5568 severe performance problems. Patch by David Mosberger.
5570 * The Hurd port got a lot more functionality like AIO, various stdio
5571 extensions, etc. Mainly done by Roland McGrath.
5573 * mtrace can now lookup symbols in shared libraries.
5577 * Intel's IA-64 math library is largely integrated. It provides fast and
5578 accurate implementatations for most basic and standard math functions
5579 in float, double, and long double format.
5581 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5582 and asin for the 96-bit long double format and asin, log, tan for the
5583 128-bit long double format.
5585 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5586 The basic double functions exist today. Contributed by Abraham Ziv
5587 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5588 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5590 * An asynchronous name lookup library was added. The interface is designed
5591 after POSIX AIO. The proposal was circulated beforehand to get comments.
5592 No negative ones came in. Implemented by Ulrich Drepper.
5594 * Port to S390/64bit contributed by Martin Schwidefsky
5595 <schwidefsky@de.ibm.com>.
5597 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5598 of functions for Linux/IA-64.
5600 * The RPC code is now thread safe. Threads can now use the same service
5601 of different services at the same time. Patch by Eric Norum
5602 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5604 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5605 family of functions for Linux/S390.
5607 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5608 of functions for Linux/x86.
5610 * Port to Linux/CRIS contributed by Axis Communications.
5614 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5615 we can now check for namespace violations and missing declarations. The
5616 result is that almost all headers are now Unix-compliant (as defined in
5617 the upcoming XPG6). The negative side is that some programs might need
5618 corrections, too, if they depend on the incorrect form of the headers in
5619 previous versions which defined too many symbols and included too many
5622 * regex now handles multibyte character sets correctly.
5623 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5625 * iconv (the program) does now conform to the upcoming XPG6 and handles
5626 charmaps. Instead of the charset names the path of charmaps can be
5627 provided and the conversion happens based on this data.
5628 Contributed by Ulrich Drepper.
5630 * The locale program now provides detailed information about the installed
5635 only lists the names of the supported locales
5639 provides details such as country, language, and codeset name.
5640 Contributed by Ulrich Drepper.
5644 * The gencat program now parses the input file according to the charset
5645 selected by the LC_CTYPE category. This is important for stateful
5646 character sets. To make generating catalogs easier there is a way
5647 to overwrite the charset selected by the locale: before the first
5648 message or $ quote line the catalog can contain a line like
5650 $ codeset=ISO-8859-2
5652 to select the charset (ISO-8859-2 in this case).
5654 Implemented by Shinya Hanataka and Ulrich Drepper.
5656 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5657 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5658 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5660 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5661 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5663 * The LANGUAGE environment variable is now ignored unless the locale is
5664 changed from the default "C" locale.
5666 * The usual bug fixes.
5670 * Greg McGary added runtime support for bounds checking using gcc's
5671 new -fbounded-pointers option. ix86 target is complete. PowerPC
5674 * Thorsten Kukuk added secure mode support to nscd.
5676 * The Berkeley db libraries have been removed.
5678 Related, the nss_db module is now in a separate package since it
5679 obviously requires a database library being available.
5681 * Wide character I/O streams implemented by Ulrich Drepper.
5683 * Functions from the extended socket API added by Ulrich Drepper.
5685 * Functions feenableexcept and fedisableexcept to control the
5686 behaviour of individual exceptions have been added by Andreas Jaeger.
5688 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5690 * The resolver code has been updated from bind 8.2.3-T5B which supports
5691 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5694 This change could in some situations effect backward compatibility. Since
5695 now `_res' is a thread-local instead of a global variable, modifying it
5696 in one thread does not have any effect in other threads.
5698 The resolver library was also extended to allow IPv6 as the transport
5699 protocol for the requests. This work was done by Stig Venaas.
5701 * Compatibility code for K&R C compilers has been removed from the
5702 header files. A ISO C compiler is needed to use the library
5703 (conforming to either C89 or C99 standard).
5705 * Complete rewrite of the localedef program to support multibyte character
5706 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5707 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5708 Implemented by Ulrich Drepper.
5710 Bruno Haible significantly improved the generation and use of the data
5711 structures for the wide character tables.
5713 * Plural handling in gettext implemented by Ulrich Drepper.
5715 * The utmp daemon has been removed.
5717 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5719 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5722 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5724 * POSIX barriers implemented by Kaz Kylheku.
5726 * POSIX spawn function family implemented by Ulrich Drepper.
5728 * POSIX spinlocks are now available.
5730 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5732 * the configure option --enable-kernel=X.Y.Z allows to strip out
5733 compatibility for kernel versions before X.Y.Z. This is currently only
5734 implemented for Linux.
5736 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5737 field sin6_scope_id. This means that all programs using IPv6 should be
5738 recompiled. Don't expect binary compatibility with previous glibc
5741 * various conversion modules for IBM character sets contributed by
5744 * IA-64 port by Jes Sorensen and HJ Lu.
5758 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5760 * New xdr functions are added; some rpc functions are now 64bit clean.
5762 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5764 * Fixed known incompatibilities with glibc 2.0.
5766 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5768 * Optimized a number of functions (especially the ELF dynamic loader).
5770 * Update timezone data files.
5772 * lots of charmaps corrections
5774 * some new locale definitions and charmaps
5779 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5780 conform to POSIX member type requirements. Symbol versions have been
5781 adjusted as needed within the library, and for direct use by applications,
5782 but there is potential for problems if third-party libraries use
5783 struct timeval as part of their interface. This does not present
5784 a problem for X and other "essential" system libraries.
5786 * An additional locale model to support C++ Standard Library locale
5787 model and probably more was implemented by Ulrich Drepper.
5789 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5792 * Miles Bader provided the `argp' function family to support hierachical
5793 command line argument parsing, layered on top of getopt.
5795 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5797 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5800 * scanf recognizes the %a and %A format for scanning floating point numbers.
5802 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5803 information and interfaces for the available integer types.
5805 * about 130 new math functions were added to implement the ISO C9x math
5808 * the new header <complex.h> contains definitions of the complex math
5809 functions from ISO C 9X.
5811 * the new header <tgmath.h> defines generic macros to use complex or
5812 real valued functions.
5814 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5816 * Andreas Jaeger provided a test suite for the math library.
5818 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5820 * Ulrich Drepper added character set conversion functions (iconv).
5822 * Optimized string functions have been added.
5824 * The localedata addon is now part of glibc.
5826 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5828 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5829 daemon for NSS (nscd).
5831 Missing a better place here are some numbers on improvements. Under
5832 Linux 2.1.125 un-tar-ing the kernel sources takes
5836 using local files 12.19s 6.88s 22.91s
5838 using NIS 13.92s 8.91s 26.34s
5840 using NIS & nscd 10.37s 7.34s 25.30s
5842 using NIS+ 27.57s 30.37s 640.46s
5844 using NIS+ & nscd 10.25s 7.83s 26.51s
5846 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5848 Keep in mind that non-namelookup related operations dominate above times.
5849 It was just a common complain that using NIS+ unpacking the kernel is
5852 [1] The old nscd implementation is not available anymore since it was
5853 distributed with glibc up to version 2.0.98 and thus is now replaced.
5855 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5857 * Mark Kettenis provided a Hesiod NSS module.
5859 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5860 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5862 * rcmd can now handle netgroups (Dick Streefland).
5864 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5867 * Support for the IPv6 protocol has been added to the socket API, as per the
5868 latest draft standards.
5870 * Support for Linux 2.2 has been added.
5872 * Interface changes relative to the latest 2.0.x release:
5873 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5874 addseverity NEW: Unix98
5875 alphasort64 NEW: LFS
5876 argp_err_exit_status NEW: argp, GNU ext
5877 argp_error NEW: argp, GNU ext
5878 argp_failure NEW: argp, GNU ext
5879 argp_help NEW: argp, GNU ext
5880 argp_parse NEW: argp, GNU ext
5881 argp_program_bug_address NEW: argp, GNU ext
5882 argp_program_version NEW: argp, GNU ext
5883 argp_program_version_hook NEW: argp, GNU ext
5884 argp_state_help NEW: argp, GNU ext
5885 argp_usage NEW: argp, GNU ext
5886 authdes_create NEW: Secure RPC
5887 authdes_getucred NEW: Secure RPC
5888 authdes_pk_create NEW: Secure RPC
5889 backtrace NEW: GNU ext.
5890 backtrace_symbols NEW: GNU ext.
5891 backtrace_symbols_fd NEW: GNU ext.
5893 cacosf NEW: ISO C 9x
5894 cacosh NEW: ISO C 9x
5895 cacoshf NEW: ISO C 9x
5896 cacoshl NEW: ISO C 9x
5897 cacosl NEW: ISO C 9x
5904 casinf NEW: ISO C 9x
5905 casinh NEW: ISO C 9x
5906 casinhf NEW: ISO C 9x
5907 casinhl NEW: ISO C 9x
5908 casinl NEW: ISO C 9x
5910 catanf NEW: ISO C 9x
5911 catanh NEW: ISO C 9x
5912 catanhf NEW: ISO C 9x
5913 catanhl NEW: ISO C 9x
5914 catanl NEW: ISO C 9x
5915 cbc_crypt NEW: Secure RPC
5919 ccoshf NEW: ISO C 9x
5920 ccoshl NEW: ISO C 9x
5926 cimagf NEW: ISO C 9x
5927 cimagl NEW: ISO C 9x
5928 clearerr_locked REMOVED
5929 clntunix_create NEW: sunrpc ext
5931 clog10 NEW: ISO C 9x
5932 clog10f NEW: ISO C 9x
5933 clog10l NEW: ISO C 9x
5943 cprojf NEW: ISO C 9x
5944 cprojl NEW: ISO C 9x
5946 crealf NEW: ISO C 9x
5947 creall NEW: ISO C 9x
5952 csinhf NEW: ISO C 9x
5953 csinhl NEW: ISO C 9x
5956 csqrtf NEW: ISO C 9x
5957 csqrtl NEW: ISO C 9x
5961 ctanhf NEW: ISO C 9x
5962 ctanhl NEW: ISO C 9x
5964 des_setparity NEW: Secure RPC
5965 ecb_crypt NEW: Secure RPC
5966 endutxent NEW: Unix98
5968 exp10f NEW: ISO C 9x
5969 exp10l NEW: ISO C 9x
5973 fattach NEW: STREAMS
5974 fdetach NEW: STREAMS
5978 feclearexcept NEW: ISO C 9x
5979 fegetenv NEW: ISO C 9x
5980 fegetexceptflag NEW: ISO C 9x
5981 fegetround NEW: ISO C 9x
5982 feholdexcept NEW: ISO C 9x
5984 feraiseexcept NEW: ISO C 9x
5985 ferror_locked REMOVED
5986 fesetenv NEW: ISO C 9x
5987 fesetexceptflag NEW: ISO C 9x
5988 fesetround NEW: ISO C 9x
5989 fetestexcept NEW: ISO C 9x
5990 feupdateenv NEW: ISO C 9x
5991 fflush_locked REMOVED
5995 fgets_unlocked NEW: GNU ext.
5996 fileno_locked REMOVED
6008 fputc_locked REMOVED
6009 fputs_unlocked NEW: GNU ext.
6010 fread_unlocked NEW: GNU ext.
6015 fstatvfs NEW: Unix98
6019 ftruncate64 NEW: LFS
6021 fwrite_unlocked NEW: GNU ext.
6022 gai_strerror NEW: IPv6
6026 getchar_locked REMOVED
6028 getdate_err NEW: Unix98
6029 getdate_r NEW: GNU ext.
6031 getnameinfo NEW: IPv6
6032 getnetname NEW: Secure RPC
6033 getpmsg NEW: STREAMS
6034 getpt NEW: Unix98 PTY
6035 getrlimit64 NEW: LFS
6036 getutxent NEW: Unix98
6037 getutxid NEW: Unix98
6038 getutxline NEW: Unix98
6039 glob64 NEW: GNU ext.
6040 globfree64 NEW: GNU ext.
6041 gnu_get_libc_release NEW: GNU ext.
6042 gnu_get_libc_version NEW: GNU ext.
6043 grantpt NEW: Unix98 PTY
6044 host2netname NEW: Secure RPC
6046 iconv_close NEW: iconv
6047 iconv_open NEW: iconv
6048 if_freenameindex NEW: IPv6
6049 if_indextoname NEW: IPv6
6050 if_nameindex NEW: IPv6
6051 if_nametoindex NEW: IPv6
6052 in6addr_any NEW: IPv6
6053 in6addr_loopback NEW: IPv6
6054 inet6_isipv4mapped NEW: IPv6
6055 isastream NEW: STREAMS
6056 iswblank NEW: GNU ext.
6057 key_decryptsession NEW: Secure RPC
6058 key_decryptsession_pk NEW: Secure RPC
6059 key_encryptsession NEW: Secure RPC
6060 key_encryptsession_pk NEW: Secure RPC
6061 key_gendes NEW: Secure RPC
6062 key_get_conv NEW: Secure RPC
6063 key_secretkey_is_set NEW: Secure RPC
6064 key_setnet NEW: Secure RPC
6065 key_setsecret NEW: Secure RPC
6066 llrint NEW: ISO C 9x
6067 llrintf NEW: ISO C 9x
6068 llrintl NEW: ISO C 9x
6069 llround NEW: ISO C 9x
6070 llroundf NEW: ISO C 9x
6071 llroundl NEW: ISO C 9x
6076 lrintf NEW: ISO C 9x
6077 lrintl NEW: ISO C 9x
6078 lround NEW: ISO C 9x
6079 lroundf NEW: ISO C 9x
6080 lroundl NEW: ISO C 9x
6082 makecontext NEW: Unix98
6083 mempcpy NEW: GNU ext.
6086 modify_ldt NEW: kernel
6090 nearbyint NEW: ISO C 9x
6091 nearbyintf NEW: ISO C 9x
6092 nearbyintl NEW: ISO C 9x
6093 netname2host NEW: Secure RPC
6094 netname2user NEW: Secure RPC
6095 nexttoward NEW: ISO C 9x
6096 nexttowardf NEW: ISO C 9x
6097 nexttowardl NEW: ISO C 9x
6101 passwd2des NEW: Secure RPC
6103 pow10f NEW: GNU ext.
6104 pow10l NEW: GNU ext.
6107 printf_size NEW: GNU ext.
6108 printf_size_info NEW: GNU ext.
6109 profil_counter REMOVED
6110 pthread_mutexattr_getkind_np REPLACED
6111 pthread_mutexattr_setkind_np REPLACED
6112 ptsname NEW: Unix98 PTY
6113 ptsname_r NEW: Unix98 PTY
6115 putchar_locked REMOVED
6116 putgrent NEW: GNU ext.
6118 putpmsg NEW: STREAMS
6119 pututxline NEW: Unix98
6123 readdir64_r NEW: LFS
6124 remquo NEW: ISO C 9x
6125 remquof NEW: ISO C 9x
6126 remquol NEW: ISO C 9x
6128 roundf NEW: ISO C 9x
6129 roundl NEW: ISO C 9x
6131 scalbln NEW: ISO C 9x
6132 scalblnf NEW: ISO C 9x
6133 scalblnl NEW: ISO C 9x
6135 sendfile NEW: kernel
6136 setcontext NEW: Unix98
6137 setrlimit64 NEW: LFS
6138 setutxent NEW: Unix98
6140 sigignore NEW: Unix98
6141 sigqueue NEW: POSIX.1b
6142 sigrelse NEW: Unix98
6143 sigset NEW: POSIX.1b
6144 sigtimedwait NEW: POSIX.1b
6145 sigwaitinfo NEW: POSIX.1b
6146 sincos NEW: GNU ext.
6147 sincosf NEW: GNU ext.
6148 sincosl NEW: GNU ext.
6152 strcasestr NEW: GNU ext.
6153 strtoimax NEW: ISO C 9x
6154 strtoumax NEW: ISO C 9x
6155 strverscmp NEW: GNU ext.
6156 svcauthdes_stats NEW: Secure RPC
6157 svcunix_create NEW: sunrpc etx
6158 svcunixfd_create NEW: sunrpc ext
6159 swapcontext NEW: Unix98
6160 tcgetsid NEW: Unix98 PTY
6161 tdestroy NEW: GNU ext.
6162 tgamma NEW: ISO C 9x
6163 tgammaf NEW: ISO C 9x
6164 tgammal NEW: ISO C 9x
6168 truncf NEW: ISO C 9x
6169 truncl NEW: ISO C 9x
6171 unlockpt NEW: Unix98 PTY
6172 updwtmpx NEW: Unix98
6173 user2netname NEW: Secure RPC
6174 utmpxname NEW: Unix98
6175 versionsort NEW: GNU ext.
6176 versionsort64 NEW: GNU ext.
6178 wcscasecmp NEW: GNU ext.
6179 wcsncasecmp NEW: GNU ext.
6180 wcsnlen NEW: GNU ext.
6181 wcstoimax NEW: ISO C 9x
6182 wcstoll NEW: ISO C 9x
6183 wcstoull NEW: ISO C 9x
6184 wcstoumax NEW: ISO C 9x
6186 wordexp NEW: POSIX.2
6187 wordfree NEW: POSIX.2
6188 write_profiling REMOVED
6189 xdecrypt NEW: Secure RPC
6190 xdr_authdes_cred NEW: Secure RPC
6191 xdr_authdes_verf NEW: Secure RPC
6192 xdr_cryptkeyarg NEW: Secure RPC
6193 xdr_cryptkeyarg2 NEW: Secure RPC
6194 xdr_cryptkeyres NEW: Secure RPC
6195 xdr_getcredres NEW: Secure RPC
6196 xdr_key_netstarg NEW: Secure RPC
6197 xdr_key_netstres NEW: Secure RPC
6198 xdr_keybuf NEW: Secure RPC
6199 xdr_keystatus NEW: Secure RPC
6200 xdr_netnamestr NEW: Secure RPC
6201 xdr_sizeof NEW: Secure RPC
6202 xdr_unixcred NEW: sunrpc ext
6203 xencrypt NEW: Secure RPC
6204 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6215 * inet_ntoa is thread-safe
6217 * updwtmp is moved from libutil to libc
6219 * rewrite of cbrt function
6221 * update of timezone data
6235 * add atoll function
6237 * fix complex problems in Berkeley DB code
6239 * fix math functions
6243 * fixed lots of header problems (especially Linux/GNU specific)
6245 * dynamic loader preserves all registers
6247 * Roland McGrath provided support for handling of auxiliary objects in
6248 the ELF dynamic loader.
6250 * support for parallel builds is improved
6254 * GNU extensions are no longer declared by default. To enable them you
6255 must define the macro `_GNU_SOURCE' in your program or compile with
6258 * The library has changed from using GNU ld symbol aliases to using weak
6259 symbols where available. The ELF object file format supports weak
6260 symbols; GNU ld also supports weak symbols in the a.out format. (There
6261 is also now support for other GNU ld extensions in ELF. Use the
6262 `--with-elf' option to configure to indicate you have ELF, and
6263 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6264 of many files which contained only symbol aliases, reducing the size of
6265 the source and the compiled library; many other files were renamed to
6266 less cryptic names previously occupied by the symbol alias files.
6267 There is a new header file <elf.h> for programs which operate on
6268 files in the ELF format.
6270 * Converted to Autoconf version 2, so `configure' has more options.
6271 Run `configure --help' to see the details.
6273 * The library can now be configured to build profiling, highly-optimized
6274 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6275 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6276 `configure' enable building these extra libraries. The shared library is
6277 built by default when using both ELF and GNU ld. When shared libraries
6278 are enabled, the new library `-ldl' is available for arbitrary run-time
6279 loading of shared objects; its interface is defined in <dlfcn.h>. The
6280 new header file <link.h> gives access to the internals of the run-time
6281 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6282 application of same name on other systems and it provides information
6283 about dynamically linked binaries.
6285 * The C library now provides the run-time support code for profiling
6286 executables compiled with `-pg'. Programs can control the profiling code
6287 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6288 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6289 the support for this file format was contributed by David Mosberger-Tang.
6291 * The math code has been replaced with a math library based on fdlibm from
6292 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6293 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6294 functions. The math functions now reside in a separate library, so
6295 programs using them will need to use `-lm' their linking commands.
6297 * John C. Bowman contributed optimized ix87 assembler inline functions.
6299 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6300 mechanism similar to that found in Solaris 2. This is now used for the
6301 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6302 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6303 file controls what services are used for each individual database. This
6304 works by loading shared libraries with names specified in `nsswitch.conf',
6305 so service modules can be changed or added at any time without even
6306 relinking any program. Currently there are the file, db, and NIS based
6307 NSS services available.
6309 * The new functions `strtoq' and `strtouq' parse integer values from
6310 strings, like `strtol' and `strtoul', but they return `long long int' and
6311 `unsigned long long int' values, respectively (64-bit quantities).
6313 * The new functions `strtof' and `strtold' parse floating-point values from
6314 strings, like `strtod', but they return `float' and `long double' values,
6315 respectively (on some machines `double' and `long double' are the same).
6317 * Ulrich Drepper has contributed new implementations of the floating-point
6318 printing and reading code used in the `printf' family of functions and
6319 `strtod', `strtof', and `strtold'. These new functions are perfectly
6320 accurate, and much faster than the old ones.
6322 * The implementation of the POSIX locale model was completely rewritten by
6323 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6324 to compile the POSIX locale definition.
6326 * The former dummy implementations of the strcoll and strxfrm function are
6327 now replaced by fully functional code contributed by Ulrich Drepper. The
6328 collation information comes from the POSIX locale definitions.
6330 * The new header <langinfo.h> defines an interface for accessing
6331 various locale-dependent data (using the locale chosen with `setlocale').
6333 * Ulrich Drepper has contributed a new suite of functions for operation on
6334 wide-character and multibyte-character strings, in <wchar.h>;
6335 and classification and case conversion of wide characters, in <wctype.h>.
6336 These new functions are conforming to the ISO C, Amendement 1 specification.
6338 * There is now a second implementation of the standard I/O library available.
6339 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6340 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6342 * You can now use positional parameter specifications in format strings
6343 for the `printf' and `scanf' families of functions. For example,
6344 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6345 ``Number 6, Mr Jones''. This is mainly useful when providing different
6346 format strings for different languages, whose grammars may dictate
6347 different orderings of the values being printed. To support this
6348 feature, the interface for `register_printf_handler' has changed; see
6349 the header file <printf.h> for details.
6351 * The `printf' and `scanf' families of functions now understand a new
6352 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6353 to group numbers as indicated by the locale; for `scanf' and friends, this
6354 says to accept as valid only a number with all the proper grouping
6355 separators in the right places. In the default "C" locale, numbers are
6356 not grouped; but locales for specific countries will define the usual
6357 conventions (i.e. separate thousands with `,' in the US locale).
6359 * The pgrp functions have been regularized, slightly incompatibly but much
6360 less confusingly. The core functions are now `getpgid' and `setpgid',
6361 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6362 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6363 provided for compatibility. There is no longer an incompatible `getpgrp'
6364 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6366 * The new header file <fts.h> and suite of functions simplify programs that
6367 operate on directory trees. This code comes from 4.4 BSD.
6369 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6370 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6371 NSS scheme used in glibc.
6373 * There is a new malloc debugging hook `__memalign_hook'.
6375 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6376 `unsigned int' in <sys/types.h>. These are for compatibility only and
6377 their use is discouraged.
6379 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6380 done differently, so that it works even without GNU ld.
6382 * New function `euidaccess' checks allowed access to a file like `access',
6383 but using the effective IDs instead of the real IDs.
6385 * The time zone data files have been updated for the latest and greatest
6386 local time conventions of the countries of the world.
6388 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6391 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6392 for formatting floating-point numbers. They are provided only for
6393 compatibility; new programs should use `sprintf' instead. There are
6394 also equivalent function for the `long double' floating-point type and
6395 all functions also exist in a reentrant form.
6397 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6398 functions for maintaining the login-record files (primarily of use to
6399 system programs such as `login'), and convenient functions for
6400 allocating and initializing a pseudo-terminal (pty) device.
6402 * Ulrich Drepper has contributed new support for System V style
6403 shared memory and IPC on systems that support it.
6405 * Ulrich Drepper has contributed several miscellaneous new functions found
6406 in System V: The `hsearch' family of functions provide an effective
6407 implementation of hash tables; `a64l' and `l64a' provide a very simple
6408 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6411 * Ulrich Drepper has contributed new reentrant counterparts for the
6412 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6414 * Ulrich Drepper has contributed new, highly-optimized versions of several
6415 string functions for the i486/Pentium family of processors.
6417 * Ulrich Drepper has updated the Linux-specific code, based largely
6418 on work done in Hongjiu Lu's version of GNU libc for Linux.
6419 The GNU library now supports Linux versions 2.0.10 and later,
6420 using the ELF object file format (i[3456]86-*-linux).
6422 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6424 * David Mosberger-Tang and Richard Henderson have ported the C library
6425 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6426 dynamic linking support for ELF/Alpha.
6428 * Richard Henderson contributed several Alpha optimized assembler function
6429 for arithmetic and string handling.
6431 * Ulrich Drepper has contributed a new set of message catalog functions to
6432 support multiple languages using the <libintl.h> interface, for use with
6433 his new package GNU gettext. Translation volunteers have contributed
6434 catalogs of the library's messages in Spanish, German, and Korean.
6436 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6437 program and the `catgets' function for reading the catalog files it
6438 creates. (The <libintl.h> interface is preferred; we include the
6439 <nl_types.h> interface using `catgets' only for source compatibility with
6440 programs already written to use it.)
6442 * New header file <values.h> gives SVID-compatible names for <limits.h>
6445 * Various new macros, declarations, and small header files for compatibility
6448 * New function `group_member' is a convenient way to check if a process has
6449 a given effective group ID.
6451 * When using GCC 2.7 and later, the socket functions are now declared in a
6452 special way so that passing an argument of type `struct sockaddr_in *',
6453 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6454 `struct sockaddr *' type, does not generate a type-clash warning.
6456 * New function `error' declared in header file <error.h> is a convenient
6457 function for printing error messages and optionally exiting; this is the
6458 canonical function used in GNU programs. The new functions `err', `warn',
6459 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6460 doing the same thing.
6462 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6463 POSIX.2 `glob' function to do ~ and {...} expansion.
6465 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6466 `clearenv' which is used in POSIX.9 is also available.
6468 * New function `getsid' returns session ID number on systems that support it.
6470 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6471 files <db.h> and <mpool.h> provide a rich set of functions for several
6472 types of simple databases stored in memory and in files, and <ndbm.h> is
6473 an old `ndbm'-compatible interface using the `db' functions. Link with
6474 `-ldb' to get these functions.
6476 * New macro `strdupa' copies a string like `strdup', but uses local stack
6477 space from `alloca' instead of dynamic heap space from `malloc'.
6479 * New function `strnlen' is like `strlen' but searches only a given maximum
6480 number of characters for the null terminator. `stpncpy', `strndup' and
6481 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6484 * New function `statfs' in header <sys/statfs.h>.
6486 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6487 provide convenient functions for operating on blocks of null-terminated
6490 * A new suite of functions in <utmp.h> handle all the details of reading
6491 and writing the utmp file.
6493 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6496 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6497 completely POSIX compliant and also implemented the extended functionality
6498 to handle alternate digit representation and alternate era date formats.
6500 * Ulrich Drepper provided an implementation of the `strptime' function
6501 defined in XPG4.2 which transforms a string into a `struct tm' value.
6503 * Paul Eggert provided the tzselect shell script as part of the timezone
6504 code. The shell script makes it easy to select the correct timezone
6507 * The implementation of the malloc family of functions is completely replaced
6508 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6509 The implementation uses the mmap function (if available) and it is
6510 optimized for the use in multi threaded programs.
6512 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6513 functions. This new functionality is usable by specifying a special
6514 salt string and it is compatible with implementation on *BSD systems.
6516 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6517 `getsubopt' to handle second level command line options, `bsd_signal'
6518 to access BSD style `signal' functionality, the obsolete `regexp' style
6521 * the `lchown' function is available on system which support this
6524 * The implementation of the shadow password handling function was contributed
6527 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6529 * POSIX.1g support was added. The <sys/select.h> header is available,
6530 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6531 implementation of `getaddrinfo'.
6535 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6537 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6538 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6540 * The new function `daemon' from 4.4 BSD is useful for server programs that
6541 want to put themselves in the background.
6543 * Joel Sherrill has contributed support for several standalone boards that
6544 run without an operating system.
6546 * `printf', `scanf' and friends now accept a `q' type modifier for long
6547 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6549 * All of the code taken from BSD (notably most of the math and networking
6550 routines) has been updated from the BSD 4.4-Lite release.
6552 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6554 * The new functions `getdomainname' and `setdomainname' fetch or change the
6555 YP/NIS domain name. These are system calls which exist on systems which
6558 * The time zone data files have been updated for the latest international
6561 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6562 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6566 * The C library now includes support for Sun RPC, from Sun's free
6567 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6568 are included. (There is still no support for YP.)
6570 * Tom Quinn has contributed a port of the C library to SGI machines running
6571 Irix 4 (mips-sgi-irix4).
6573 * The new `lockf' function is a simplified interface to the locking
6574 facilities of `fcntl', included for compatibility.
6576 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6578 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6580 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6583 * The error message printed by `assert' for a failed assertion now includes
6584 the name of the program (if using GNU ld) and the name of the calling
6585 function (with versions of GCC that support this).
6587 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6589 * The library now includes the <sys/mman.h> header file and memory
6590 management functions `mmap', `munmap', `mprotect', `msync', and
6591 `madvise', on systems that support those facilities.
6593 * The interface for `mcheck' has changed slightly: the function called to
6594 abort the program when an allocation inconsistency is detected now takes
6595 an argument that indicates the type of failure. The new function
6596 `mprobe' lets you request a consistency check for a particular block at
6597 any time (checks are normally done only when you call `free' or `realloc'
6600 * It is now possible to easily cross-compile the C library, building on one
6601 system a library to run on another machine and/or operating system. All
6602 you need to do is set the variable `HOST_CC' in `configparms' to the
6603 native compiler for programs to run on the machine you are building on (a
6604 few generator programs are used on Unix systems); set `CC' to the
6607 * The new function `fexecve' (only implemented on the GNU system) executes
6608 a program file given a file descriptor already open on the file.
6612 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6613 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6615 * You can set the variable `libprefix' in `configparms' to specify a prefix
6616 to be prepended to installed library files; this makes it easy to install
6617 the GNU C library to be linked as `-lgnuc' or whatever.
6619 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6620 copies a limited number of characters from a string, and returns the
6621 address of the last character written.
6623 * You no longer need to check for whether the installed `stddef.h' is
6624 compatible with the GNU C library. configure now checks for you.
6626 * You can now define a per-stream `fileno' function to convert the
6627 stream's cookie into an integral file descriptor.
6629 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6630 allocates zero bytes of storage, and returns a unique pointer which
6631 you can pass to `realloc' or `free'. The behavior is undefined if
6632 you dereference this pointer.
6634 * The C library now runs on Sony NEWS m68k machines running either
6635 NewsOS 3 or NewsOS 4.
6637 * The new `syscall' function is a system-dependent primitive function
6638 for invoking system calls. It has the canonical behavior on Unix
6639 systems, including unreliable return values for some calls (such as
6640 `pipe', `fork' and `getppid').
6642 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6643 to `EAGAIN', which is the preferred name. On systems whose kernels
6644 use two distinct codes, the C library now translates EWOULDBLOCK to
6645 EAGAIN in every system call function.
6649 * The GNU C Library Reference Manual is now distributed with the library.
6650 `make dvi' will produce a DVI file of the printed manual.
6651 `make info' will produce Info files that you can read on line using C-h i
6652 in Emacs or the `info' program.
6653 Please send comments on the manual to bug-glibc-manual@gnu.org.
6655 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6657 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6659 * Jason Merrill has contributed a port to the Sequent Symmetry running
6660 Dynix version 3 (i386-sequent-dynix).
6662 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6663 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6665 * New function `memory_warnings' lets you arrange to get warnings when
6666 malloc is running out of memory to allocate, like Emacs gives you.
6668 * The C library now contains the relocating allocator used in Emacs 19 for
6669 its editing buffers. This allocator (ralloc) minimizes allocation
6670 overhead and fragmentation by moving allocated regions around whenever it
6671 needs to. You always refer to a ralloc'd region with a "handle" (a
6672 pointer to a pointer--an object of type `void **').
6674 * There is a new `printf' format: `%m' gives you the string corresponding
6675 to the error code in `errno'.
6677 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6678 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6679 pass, the `a' modifier says to fill in a `char **' you pass with a
6682 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6683 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6684 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6686 * `mkstemp' is a traditional Unix function to atomically create and open a
6687 uniquely-named temporary file.
6691 * The standard location for the file that says what the local timezone is
6692 has changed again. It is now `/usr/local/etc/localtime' (or more
6693 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6695 * The distribution no longer contains any files with names longer than 14
6698 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6699 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6701 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6705 * The configuration process has changed quite a bit. The `configure'
6706 script is now used just like the configuration scripts for other GNU
6707 packages. The `sysdeps' directory hierarchy is much rearranged.
6708 The file `INSTALL' explains the new scheme in detail.
6710 * The header files no longer need to be processed into ANSI C and
6711 traditional C versions. There is just one set of files to install, and
6712 it will work with ANSI or old C compilers (including `gcc -traditional').
6714 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6715 MIPS DECStation running Ultrix 4.
6717 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6718 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6719 made itself into a shared library.
6721 * Yet further improved support for the i386, running 4.3 BSD-like systems
6722 (such as Mach 3 with the Unix single-server), or System V.
6724 * New function `strncasecmp' to do case-insensitive string comparison
6725 with limited length.
6727 * New function `strsep' is a reentrant alternative to `strtok'.
6729 * New functions `scandir' and `alphasort' for searching directories.
6731 * New function `setenv' is a better interface to `putenv'.
6733 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6734 function for traversing a directory tree.
6736 * The GNU obstack package is now also part of the C library.
6737 The new function `open_obstack_stream' creates a stdio stream that
6738 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6739 formatted output directly to an obstack.
6741 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6742 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6744 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6746 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6747 things to your strings.
6749 * There are some new test programs: test-fseek, testmb, and testrand.
6751 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6752 These ports are not finished, but are a good starting place for really
6753 supporting those systems.
6755 * `/etc/localtime' is now the standard location for the file that says what
6756 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6757 This follows the general principle that `/etc' is the place for all local
6758 configuration files.
6760 * The C library header files now use `extern "C"' when used by the C++
6761 compiler, so the C library should now work with C++ code.
6763 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6764 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6767 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6768 function which uses the `merge sort' algorithm, and is said to be
6769 significantly faster than the old GNU `qsort' function. Merge sort is
6770 now the standard `qsort' function. The new algorithm can require a lot
6771 of temporary storage; so, the old sorting function is called when the
6772 required storage is not available.
6774 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6775 provides the Unix `crypt' function, plus some other entry points.
6777 * The code and header files taken from 4.4 BSD have been updated with the
6778 latest files released from Berkeley.
6780 ----------------------------------------------------------------------
6783 Permission is granted to anyone to make or distribute verbatim copies
6784 of this document as received, in any medium, provided that the
6785 copyright notice and this permission notice are preserved,
6786 thus giving the recipient permission to redistribute in turn.
6788 Permission is granted to distribute modified versions
6789 of this document, or of portions of it,
6790 under the above conditions, provided also that they
6791 carry prominent notices stating who last changed them.
6794 version-control: never