1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2022 Free Software Foundation, Inc.
3 See the end for copying conditions.
5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
6 using `glibc' in the "product" field.
12 * Unicode 14.0.0 Support: Character encoding, character type info, and
13 transliteration tables are all updated to Unicode 14.0.0, using
14 generator scripts contributed by Mike FABIAN (Red Hat).
16 * Bump r_version in the debugger interface to 2 and add a new field,
17 r_next, support multiple namespaces.
19 * Support for the C.UTF-8 locale has been added to glibc. The locale
20 supports full code-point sorting for all valid Unicode code points. A
21 limitation in the framework for fnmatch, regexec, and regcomp requires
22 a compromise to save space and only ASCII-based range expressions are
23 supported for now (see bug 28255). The full size of the locale is
24 only ~400KiB, with 346KiB coming from LC_CTYPE information for
25 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
26 in various downstream distributions. The locale is not built into
27 glibc, and must be installed.
29 * <math.h> functions that round their results to a narrower type, and
30 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
31 18661-3:2015 and draft ISO C2X:
33 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
34 fMxsqrtfN and fMxsqrtfNx functions.
36 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
39 * <math.h> functions for floating-point maximum and minimum,
40 corresponding to new operations in IEEE 754-2019, and corresponding
41 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
42 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
43 fminimum_mag, fminimum_mag_num and corresponding functions for float,
44 long double, _FloatN and _FloatNx.
46 * <math.h> macros for single-precision float constants are added as a
47 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
48 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
51 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
52 predefined as specified in TS 18661-1:2014.
54 * The exp10 functions in <math.h> now have a corresponding type-generic
57 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
59 * printf-family functions now support the %b format for output of
60 integers in binary, as specified in draft ISO C2X, and the %B variant
61 of that format recommended by draft ISO C2X.
63 * A new DSO sorting algorithm has been added in the dynamic linker that uses
64 topological sorting by depth-first search (DFS), solving performance issues
65 of the existing sorting algorithm when encountering particular circular
66 object dependency cases.
68 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
69 the two DSO sorting algorithms. The default setting of '2' uses the
70 new DFS-based algorithm. The setting '1' switches to the old
71 algorithm used in glibc 2.33 and earlier.
73 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
74 to be used by compilers for optimizing usage of 'memcmp' when its
75 return value is only used for its boolean status.
77 * Support for automatically registering threads with the Linux rseq
78 system call has been added. This system call is implemented starting
79 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
80 operations on per-cpu data. It allows user-space to perform updates
81 on per-cpu data without requiring heavy-weight atomic operations.
82 Automatically registering threads allows all libraries, including
83 libc, to make immediate use of the rseq support by using the
84 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
85 variables. The GNU C Library manual has details on integration of
86 Restartable Sequences.
88 * A symbolic link to the dynamic linker is now installed under
89 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
91 * All programs and the testsuite in glibc are now built as position independent
92 executables (PIE) by default on toolchains and architectures that support it.
93 Further, if the toolchain and architecture supports it, even static programs
94 are built as PIE and the resultant glibc can be used to build static PIE
95 executables. A new option --disable-default-pie has been added to disable
96 this behavior and get a non-PIE build. This option replaces
97 --enable-static-pie, which no longer has any effect on the build
100 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
101 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
102 or to use huge pages directly with mmap calls with the MAP_HUGETLB
103 flags). The former can improve performance when Transparent Huge Pages
104 is set to 'madvise' mode while the latter uses the system reserved
107 * The printf family of functions now handles the flagged %#m conversion
108 specifier, printing errno as an error constant (similar to strerrorname_np).
110 * The function _dl_find_object has been added. In-process unwinders
111 can use it to efficiently locate unwinding information for a code
114 * Support for OpenRISC running on Linux has been added. This port requires
115 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
120 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
121 64-bit file offsets (LFS default).
123 * A new configure option, --with-rtld-early-cflags, can be used to
124 specify additional compiler flags for building the early startup code
125 of the dynamic linker. On targets which have CPU compatibility
126 checks, this can help to ensure that proper diagnostics are printed if
127 the dynamic loader runs on an incompatible CPU.
129 Deprecated and removed features, and other changes affecting compatibility:
131 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
132 has been removed since the first PT_LOAD segment is no longer executable
133 due to defaulting to -z separate-code.
135 * The r_version update in the debugger interface makes the glibc binary
136 incompatible with GDB binaries built without the following commits:
138 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
139 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
141 when audit modules or dlmopen are used.
143 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
145 * The --enable-static-pie option is no longer available. The glibc build
146 configuration script now automatically detects static-pie support in the
147 toolchain and architecture and enables it if available.
149 * The catchsegv script and associated libSegFault.so shared object have
150 been removed. There are widely-deployed out-of-process alternatives for
151 catching coredumps and backtraces.
153 Changes to build and runtime requirements:
155 [Add changes to build and runtime requirements here]
157 Security related changes:
159 CVE-2022-23219: Passing an overlong file name to the clnt_create
160 legacy function could result in a stack-based buffer overflow when
161 using the "unix" protocol. Reported by Martin Sebor.
163 The following bugs are resolved with this release:
165 [The release manager will add the list generated by
166 scripts/list-fixed-bugs.py just before the release.]
173 * In order to support smoother in-place-upgrades and to simplify
174 the implementation of the runtime all functionality formerly
175 implemented in the libraries libpthread, libdl, libutil, libanl has
176 been integrated into libc. New applications do not need to link with
177 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
178 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
179 provided, so that the linker options keep working. Applications which
180 have been linked against glibc 2.33 or earlier continue to load the
181 corresponding shared objects (which are now empty). The integration
182 of those libraries into libc means that additional symbols become
183 available by default. This can cause applications that contain weak
184 references to take unexpected code paths that would only have been
185 used in previous glibc versions when e.g. preloading libpthread.so.0,
186 potentially exposing application bugs.
188 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
189 PTHREAD_STACK_MIN is no longer constant and is redefined to
190 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
191 sets for modern architectural features like Arm SVE.
193 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
194 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
195 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
196 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
197 dynamic sized register sets for modern architectural features like
200 * The dynamic linker implements the --list-diagnostics option, printing
201 a dump of information related to IFUNC resolver operation and
202 glibc-hwcaps subdirectory selection.
204 * On Linux, the function execveat has been added. It operates similar to
205 execve and it is is already used to implement fexecve without requiring
206 /proc to be mounted. However, different than fexecve, if the syscall is not
207 supported by the kernel an error is returned instead of trying a fallback.
209 * The ISO C2X function timespec_getres has been added.
211 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
212 C2X, is supported to enable declarations of functions defined in Annex F
213 of C2X. Those declarations are also enabled when
214 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
215 defined, and when _GNU_SOURCE is defined.
217 * On powerpc64*, glibc can now be compiled without scv support using the
218 --disable-scv configure option.
220 * Add support for 64-bit time_t on configurations like x86 where time_t
221 is traditionally 32-bit. Although time_t still defaults to 32-bit on
222 these configurations, this default may change in future versions.
223 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
224 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
225 only enabled for Linux and the full support requires a minimum kernel
228 * The main gconv-modules file in glibc now contains only a small set of
229 essential converter modules and the rest have been moved into a supplementary
230 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
231 in the same GCONV_PATH. Similarly, external converter modules directories
232 may have supplementary configuration files in a gconv-modules.d directory
233 with names ending with .conf to logically classify the converter modules in
236 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
237 to configure the size of the thread stack cache.
239 * The function _Fork has been added as an async-signal-safe fork replacement
240 since Austin Group issue 62 droped the async-signal-safe requirement for
241 fork (and it will be included in the future POSIX standard). The new _Fork
242 function does not run any atfork function neither resets any internal state
243 or lock (such as the malloc one), and only sets up a minimal state required
244 to call async-signal-safe functions (such as raise or execve). This function
245 is currently a GNU extension.
247 * On Linux, the close_range function has been added. It allows efficiently
248 closing a range of file descriptors on recent kernels (version 5.9).
250 * The function closefrom has been added. It closes all file descriptors
251 greater than or equal to a given integer. This function is a GNU extension,
252 although it is also present in other systems.
254 * The posix_spawn_file_actions_addclosefrom_np function has been added,
255 enabling posix_spawn and posix_spawnp to close all file descriptors greater
256 than or equal to a given integer. This function is a GNU extension,
257 although Solaris also provides a similar function.
259 * When invoked explicitly, the dynamic linker now uses the kernel to
260 execute programs that do not have any dynamic dependency (that is,
261 they are statically linked). This feature is Linux-specific.
263 * The audit libraries will avoid unnecessary slowdown if it is not required
264 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
266 Deprecated and removed features, and other changes affecting compatibility:
268 * The function pthread_mutex_consistent_np has been deprecated; programs
269 should use the equivalent standard function pthread_mutex_consistent
272 * The function pthread_mutexattr_getrobust_np has been deprecated;
273 programs should use the equivalent standard function
274 pthread_mutexattr_getrobust instead.
276 * The function pthread_mutexattr_setrobust_np has been deprecated;
277 programs should use the equivalent standard function
278 pthread_mutexattr_setrobust instead.
280 * The function pthread_yield has been deprecated; programs should use
281 the equivalent standard function sched_yield instead.
283 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
285 * Various rarely-used functions declared in <resolv.h> and
286 <arpa/nameser.h> have been deprecated. Applications are encouraged to
287 use dedicated DNS processing libraries if applicable. For <resolv.h>,
288 this affects the functions dn_count_labels, fp_nquery, fp_query,
289 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
290 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
291 p_type, putlong, putshort, res_hostalias, res_isourserver,
292 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
293 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
294 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
295 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
297 * Various symbols previously defined in libresolv have been moved to libc
298 in order to prepare for libresolv moving entirely into libc (see earlier
299 entry for merging libraries into libc). The symbols __dn_comp,
300 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
301 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
302 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
303 __res_search, __res_send formerly in libresolv have been renamed and no
304 longer have a __ prefix. They are now available in libc.
306 * The pthread cancellation handler is now installed with SA_RESTART and
307 pthread_cancel will always send the internal SIGCANCEL on a cancellation
308 request. It should not be visible to applications since the cancellation
309 handler should either act upon cancellation (if asynchronous cancellation
310 is enabled) or ignore the cancellation internal signal. However there are
311 buggy kernel interfaces (for instance some CIFS versions) that could still
312 see a spurious EINTR error when cancellation interrupts a blocking syscall.
314 * Previously, glibc installed its various shared objects under versioned
315 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
316 were provided as symbolic links. Starting with glibc 2.34, the shared
317 objects are installed under their ABI sonames directly, without
318 symbolic links. This increases compatibility with distribution
319 package managers that delete removed files late during the package
320 upgrade or downgrade process.
322 * The symbols mallwatch and tr_break are now deprecated and no longer used in
323 mtrace. Similar functionality can be achieved by using conditional
324 breakpoints within mtrace functions from within gdb.
326 * The __morecore and __after_morecore_hook malloc hooks and the default
327 implementation __default_morecore have been removed from the API. Existing
328 applications will continue to link against these symbols but the interfaces
329 no longer have any effect on malloc.
331 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
332 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
333 disabled by default in the main C library. Users looking to use these
334 features now need to preload a new debugging DSO libc_malloc_debug.so to get
335 this functionality back.
337 * The deprecated functions malloc_get_state and malloc_set_state have been
338 moved from the core C library into libc_malloc_debug.so. Legacy applications
339 that still use these functions will now need to preload libc_malloc_debug.so
340 in their environment using the LD_PRELOAD environment variable.
342 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
343 __memalign_hook and __free_hook are now removed from the API. Compatibility
344 symbols are present to support legacy programs but new applications can no
345 longer link to these symbols. These hooks no longer have any effect on glibc
346 functionality. The malloc debugging DSO libc_malloc_debug.so currently
347 supports hooks and can be preloaded to get this functionality back for older
348 programs. However this is a transitional measure and may be removed in a
349 future release of the GNU C Library. Users may port away from these hooks by
350 writing and preloading their own malloc interposition library.
352 Changes to build and runtime requirements:
354 * On Linux, the shm_open, sem_open, and related functions now expect the
355 file shared memory file system to be mounted at /dev/shm. These functions
356 no longer search among the system's mount points for a suitable
357 replacement if /dev/shm is not available.
359 Security related changes:
361 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
362 a request for netgroup lookup, may crash due to a double-free,
363 potentially resulting in degraded service or Denial of Service on the
364 local system. Reported by Chris Schanzle.
366 CVE-2021-33574: The mq_notify function has a potential use-after-free
367 issue when using a notification type of SIGEV_THREAD and a thread
368 attribute with a non-default affinity mask.
370 CVE-2021-35942: The wordexp function may overflow the positional
371 parameter number when processing the expansion resulting in a crash.
372 Reported by Philippe Antoine.
374 The following bugs are resolved with this release:
376 [4737] libc: fork is not async-signal-safe
377 [5781] math: Slow dbl-64 sin/cos/sincos for special values
378 [10353] libc: Methods for deleting all file descriptors greater than
379 given integer (closefrom)
380 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
381 name containing multi-byte character(s)
382 [14469] math: Inaccurate j0f function
383 [14470] math: Inaccurate j1f function
384 [14471] math: Inaccurate y0f function
385 [14472] math: Inaccurate y1f function
386 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
388 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
389 crashes if it fails dlsym() twice
390 [15648] nptl: multiple definition of `__lll_lock_wait_private'
391 [16063] nptl: Provide a pthread_once variant in libc directly
392 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
393 [17145] libc: syslog with LOG_CONS leaks console file descriptor
394 [17183] manual: description of ENTRY struct in <search.h> in glibc
396 [18435] nptl: pthread_once hangs when init routine throws an exception
397 [18524] nptl: Missing calloc error checking in
398 __cxa_thread_atexit_impl
399 [19329] dynamic-link: dl-tls.c assert failure at concurrent
400 pthread_create and dlopen
401 [19366] nptl: returning from a thread should disable cancellation
402 [19511] nptl: 8MB memory leak in pthread_create in case of failure
403 when non-root user changes priority
404 [20802] dynamic-link: getauxval NULL pointer dereference after static
406 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
407 [22057] malloc: malloc_usable_size is broken with mcheck
408 [22668] locale: LC_COLLATE: the last character of ellipsis is not
410 [23323] libc: [RFE] CSU startup hardening.
411 [23328] malloc: Remove malloc hooks and ensure related APIs return no
413 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
414 $PLATFORM, $ORIGIN) crashes
415 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
416 [23554] nptl: pthread_getattr_np reports wrong stack size with
418 [24106] libc: Bash interpreter in ldd script is taken from host
419 [24773] dynamic-link: dlerror in an secondary namespace does not use
420 the right free implementation
421 [25036] localedata: Update collation order for Swedish
422 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
423 shm_open to pick wrong directory
424 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
425 crash in IFUNC resolver due to stack canary (--enable-stack-
427 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
428 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
429 [27111] dynamic-link: pthread_create and tls access use link_map
430 objects that may be concurrently freed by dlclose
431 [27132] malloc: memusagestat is linked to system librt, leading to
432 undefined symbols on major version upgrade
433 [27136] dynamic-link: dtv setup at thread creation may leave an entry
435 [27249] libc: libSegFault.so does not output signal number properly
436 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
438 [27318] dynamic-link: glibc fails to load binaries when built with
439 -march=sandybridge: CPU ISA level is lower than required
440 [27343] nss: initgroups() SIGSEGVs when called on a system without
441 nsswich.conf (in a chroot)
442 [27346] dynamic-link: x86: PTWRITE feature check is missing
443 [27389] network: NSS chroot hardening causes regressions in chroot
445 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
446 [27444] libc: sysconf reports unsupported option (-1) for
447 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
448 [27462] nscd: double-free in nscd (CVE-2021-27645)
449 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
450 malloc/tst-malloc-thread-fail
451 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
452 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
454 [27522] glob: glob, glob64 incorrectly marked as __THROW
455 [27555] dynamic-link: Static tests fail with --enable-stack-
457 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
458 information for the current directory
459 [27577] dynamic-link: elf/ld.so --help doesn't work
460 [27605] libc: tunables can't control xsave/xsavec selection in
462 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
463 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
465 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
466 _nss_files_getcanonname_r) from within a dlmopen namespace.
467 [27648] libc: FAIL: misc/tst-select
468 [27650] stdio: vfscanf returns too early if a match is longer than
470 [27651] libc: Performance regression after updating to 2.33
471 [27655] string: Wrong size calculation in string/test-strnlen.c
472 [27706] libc: select fails to update timeout on error
473 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
474 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
475 tries resolving them lazily
476 [27744] nptl: Support different libpthread/ld.so load orders in
478 [27749] libc: Data race __run_exit_handlers
479 [27761] libc: getconf: Segmentation fault when passing '-vq' as
481 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
482 exceeds maximum object size 2147483647
483 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
485 [27872] build: Obsolete configure option --enable-stackguard-
487 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
488 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
489 [27892] libc: powerpc: scv ABI error handling fails to check
491 [27896] nptl: mq_notify does not handle separately allocated thread
492 attributes (CVE-2021-33574)
493 [27901] libc: TEST_STACK_ALIGN doesn't work
494 [27902] libc: The x86-64 clone wrapper fails to align child stack
495 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
496 [27939] libc: aarch64: clone does not align the stack
497 [27968] libc: s390x: clone does not align the stack
498 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
499 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
501 [28028] malloc: malloc: tcache shutdown sequence does not work if the
502 thread never allocated anything
503 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
504 [28064] string: x86_64:wcslen implementation list has wcsnlen
505 [28067] libc: FAIL: posix/tst-spawn5
506 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
507 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
509 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
510 [28089] build: tst-tls20 fails when linker defaults to --as-needed
511 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
513 [28091] network: ns_name_skip may return 0 for domain names without
521 * The dynamic linker accepts the --list-tunables argument which prints
522 all the supported tunables. This option is disable if glibc is
523 configured with tunables disabled (--enable-tunables=no).
525 * The dynamic linker accepts the --argv0 argument and provides opportunity
526 to change argv[0] string.
528 * The dynamic linker loads optimized implementations of shared objects
529 from subdirectories under the glibc-hwcaps directory on the library
530 search path if the system's capabilities meet the requirements for
531 that subdirectory. Initially supported subdirectories include
532 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
533 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
534 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
535 subdirectory names correspond to the vendor-independent x86-64
536 microarchitecture levels defined in the x86-64 psABI supplement.
538 * The new --help option of the dynamic linker provides usage and
539 information and library search path diagnostics.
541 * The mallinfo2 function is added to report statistics as per mallinfo,
542 but with larger field widths to accurately report values that are
543 larger than fit in an integer.
545 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
547 * Support for the RISC-V ISA running on Linux has been expanded to run on
548 32-bit hardware. This is supported for the following ISA and ABI pairs:
554 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
557 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
558 glibc may use additional checks that may have an additional performance
559 overhead. At present these checks are available only on LLVM 9 and later.
560 The latest GCC available at this time (10.2) does not support this level of
563 Deprecated and removed features, and other changes affecting compatibility:
565 * The mallinfo function is marked deprecated. Callers should call
568 * When dlopen is used in statically linked programs, alternative library
569 implementations from HWCAP subdirectories are no longer loaded.
570 Instead, the default implementation is used.
572 * The deprecated <sys/vtimes.h> header and the function vtimes have been
573 removed. To support old binaries, the vtimes function continues to exist
574 as a compatibility symbol. Applications should use the getrlimit or
577 * Following a change in the tzdata 2018a release upstream, the zdump
578 program is now installed in the /usr/bin subdirectory. Previously,
579 the /usr/sbin subdirectory was used.
581 * On s390(x), the type float_t is now derived from the macro
582 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
583 hardcoded to double. This does not affect the ABI of any libraries
584 that are part of the GNU C Library, but may affect the ABI of other
585 libraries that use this type in their interfaces. The new definition
586 improves consistency with compiler behavior in many scenarios.
588 * A future version of glibc will stop loading shared objects from the
589 "tls" subdirectories on the library search path, the subdirectory that
590 corresponds to the AT_PLATFORM system name, and also stop employing
591 the legacy AT_HWCAP search mechanism. Applications should switch to
592 the new glibc-hwcaps mechanism instead; if they do not do that, only
593 the baseline version (directly from the search path directory) will be
596 Changes to build and runtime requirements:
598 * On Linux, the system administrator needs to configure /dev/pts with
599 the intended access modes for pseudo-terminals. glibc no longer
600 attemps to adjust permissions of terminal devices. The previous glibc
601 defaults ("tty" group, user read/write and group write) already
602 corresponded to what most systems used, so that grantpt did not
603 perform any adjustments.
605 * On Linux, the posix_openpt and getpt functions no longer attempt to
606 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
607 (and pseudo-terminals are supported), a devpts file system is mounted
608 on /dev/pts. Current systems already meet these requirements.
610 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
612 Security related changes:
614 CVE-2021-3326: An assertion failure during conversion from the
615 ISO-20220-JP-3 character set using the iconv function has been fixed.
616 This assertion was triggered by certain valid inputs in which the
617 converted output contains a combined sequence of two wide characters
618 crossing a buffer boundary. Reported by Tavis Ormandy.
620 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
621 invoked with input containing redundant shift sequences in the IBM1364,
622 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
624 CVE-2020-29562: An assertion failure has been fixed in the iconv function
625 when invoked with UCS4 input containing an invalid character.
627 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
628 invoked with EUC-KR input containing invalid multibyte input sequences.
630 The following bugs are resolved with this release:
632 [10635] libc: realpath portability patches
633 [16124] dynamic-link: ld.so should allow to change argv[0]
634 [17924] malloc: 'free' should not set errno
635 [18683] libc: Linux faccessat implementation can incorrectly ignore
637 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
638 [23091] hurd: missing waitid support
639 [23249] libc: Epyc and other current AMD CPUs do not select the
640 "haswell" platform subdirectory
641 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
643 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
645 [24941] libc: Make grantpt usable after multi-threaded fork in more
647 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
648 [24973] locale: iconv encounters segmentation fault when converting
649 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
650 [25399] string: undefined reference to `__warn_memset_zero_len' when
651 changing gnuc version
652 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
654 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
656 [25971] libc: s390 bits/hwcap.h out of sync with kernel
657 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
658 [26100] libc: Race in syslog(3) with regards to tag printing.
659 [26124] libc: Export <cpu-features.h>
660 [26130] nscd: Inconsistent nscd cache during pruning
661 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
662 [26224] locale: iconv hangs when converting some invalid inputs from
663 several IBM character sets (CVE-2020-27618)
664 [26341] libc: realpath cyclically call __alloca(path_max) to consume
666 [26343] manual: invalid documented return type for strerrorname_np(),
667 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
668 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
670 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
672 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
673 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
675 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
676 [26553] libc: mtx_init allows type set to "mtx_recursive" only
677 [26555] string: strerrorname_np does not return the documented value
678 [26592] libc: pointer arithmetic overflows in realpath
679 [26600] network: Transaction ID collisions cause slow DNS lookups in
681 [26606] libc: [2.33 Regression] pselect is broken on x32
682 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
683 [26620] glob: fnmatch with collating symbols results in segmentation
685 [26625] libc: [2.33 Regression] CET is disabled
686 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
687 at the end of a memory mapping
688 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
689 by the caller to the kernel
690 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
691 [26647] build: [-Werror=array-parameter=] due to different
692 declarations for __sigsetjmp
693 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
695 [26649] stdio: printf should handle non-normal x86 long double numbers
696 gracefully (CVE-2020-29573)
697 [26686] build: -Warray-parameter instances building with GCC 11
698 [26687] build: -Warray-bounds instances building with GCC 11
699 [26690] stdio: Aliasing violation in __vfscanf_internal
700 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
701 [26726] build: GCC warning calling new_composite_name with an array of
703 [26736] libc: FAIL: misc/tst-sysvshm-linux
704 [26737] libc: Random FAIL: rt/tst-shm
705 [26791] libc: Missing O_CLOEXEC in sysconf.c
706 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
708 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
710 [26818] string: aarch64: string tests may run ifunc variants that are
712 [26821] libc: Memory leak test failures on Fedora 33
713 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
714 FSGSBASE/LM/RDRAND check failure
715 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
717 [26853] libc: aarch64: Missing unwind information in statically linked
719 [26923] locale: Assertion failure in iconv when converting invalid
720 UCS4 (CVE-2020-29562)
721 [26926] dynamic-link: aarch64: library dependencies are not bti
723 [26932] libc: sh: Multiple floating point functions defined as stubs
725 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
727 [26988] dynamic-link: aarch64: BTI mprotect address is not page
729 [27002] build: libc_freeres_fn build failure with GCC 11
730 [27004] dynamic-link: ld.so is miscompiled by GCC 11
731 [27008] dynamic-link: ld.so.cache should have endianness markup
732 [27042] libc: [alpha] anonymous union in struct stat confuses
734 [27053] libc: Conformance regression in system(3) (and probably also
736 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
738 [27077] network: Do not reload /etc/nsswitch.conf from chroot
739 [27083] libc: Unsafe unbounded alloca in addmntent
740 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
742 [27130] string: "rep movsb" performance issue
743 [27150] libc: alpha: wait4() is unavailable in static linking
744 [27177] dynamic-link:
745 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
747 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
748 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
749 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
750 related to combining characters (CVE-2021-3326)
757 * Unicode 13.0.0 Support: Character encoding, character type info, and
758 transliteration tables are all updated to Unicode 13.0.0, using
759 generator scripts contributed by Mike FABIAN (Red Hat).
761 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
763 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
764 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
765 Three ABIs are supported:
771 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
772 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
774 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
775 DT_DEPAUDIT dynamic section entries of the main executable.
777 * powerpc64le supports IEEE128 long double libm/libc redirects when
778 using -mabi=ieeelongdouble to compile C code on supported GCC
779 toolchains. It is recommended to use GCC 8 or newer when testing
782 * To help detect buffer overflows and other out-of-bounds accesses
783 several APIs have been annotated with GCC 'access' attribute. This
784 should help GCC 10 issue better warnings.
786 * On Linux, functions pthread_attr_setsigmask_np and
787 pthread_attr_getsigmask_np have been added. They allow applications
788 to specify the signal mask of a thread created with pthread_create.
790 * The GNU C Library now provides the header file <sys/single_threaded.h>
791 which declares the variable __libc_single_threaded. Applications are
792 encouraged to use this variable for single-thread optimizations,
793 instead of weak references to symbols historically defined in
796 * The functions sigabbrev_np and sigdescr_np have been added. The
797 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
798 SIGHUP) while sigdescr_np returns a string describing the signal number
799 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
800 attempt to translate the return description, both functions return
801 NULL for an invalid signal number.
803 They should be used instead of sys_siglist or sys_sigabbrev and they
804 are both thread and async-signal safe. These functions are GNU extensions.
806 * The functions strerrorname_np and strerrordesc_np have been added. The
807 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
808 while strerrordesc_np returns a string describing the error number
809 (e.g "Invalid argument" for EINVAL). Different than strerror,
810 strerrordesc_np does not attempt to translate the return description, both
811 functions return NULL for an invalid error number.
813 They should be used instead of sys_errlist and sys_nerr, both are
814 thread and async-signal safe. These functions are GNU extensions.
816 * AArch64 now supports standard branch protection security hardening
817 in glibc when it is built with a GCC that is configured with
818 --enable-standard-branch-protection (or if -mbranch-protection=standard
819 flag is passed when building both GCC target libraries and glibc,
820 in either case a custom GCC is needed). This includes branch target
821 identification (BTI) and pointer authentication for return addresses
822 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
823 extensions respectively for the protection to be effective,
824 otherwise the used instructions are nops. User code can use PAC-RET
825 without libc support, but BTI requires a libc that is built with BTI
826 support, otherwise runtime objects linked into user code will not be
829 Deprecated and removed features, and other changes affecting compatibility:
831 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
832 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
833 RPC header files. Backward compatibility for old programs is kept
834 only for architectures and ABIs that have been added in or before
835 glibc 2.31. New programs need to use TI-RPC
836 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
837 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
839 * Remove configure option --enable-obsolete-nsl. libnsl is only built
840 as shared library for backward compatibility and the NSS modules "nis"
841 and "nisplus" are not built at all and libnsl's headers aren't
842 installed. This compatibility is kept only for architectures and ABIs
843 that have been added in or before version 2.28. Replacement
844 implementations based on TI-RPC, which additionally support IPv6, are
845 available from <https://github.com/thkukuk/>. This change does not
846 affect the "compat" NSS module, which does not depend on libnsl
847 since 2.27 and thus can be used without NIS.
849 * The deprecated <sys/sysctl.h> header and the sysctl function have been
850 removed. To support old binaries, the sysctl function continues to
851 exist as a compatibility symbol (on those architectures which had it),
852 but always fails with ENOSYS. This reflects the removal of the system
853 call from all architectures, starting with Linux 5.5.
855 * The sstk function is no longer available to newly linked binaries.
856 Its implementation always returned with a failure, and the function
857 was not declared in any header file.
859 * The legacy signal handling functions siginterrupt, sigpause, sighold,
860 sigrelse, sigignore and sigset, and the sigmask macro have been
861 deprecated. Applications should use the sigsuspend, sigprocmask and
862 sigaction functions instead.
864 * ldconfig now defaults to the new format for ld.so.cache. glibc has
865 already supported this format for almost 20 years.
867 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
868 are no longer available to newly linked binaries, and their declarations
869 have been removed from <string.h>. They are exported solely as
870 compatibility symbols to support old binaries. All programs should use
873 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
874 are no longer available to newly linked binaries, and their declarations
875 have been removed from <stdio.h>. They are exported solely as
876 compatibility symbols to support old binaries. All programs should use
877 strerror or strerror_r instead.
879 * Both strerror and strerror_l now share the same internal buffer in the
880 calling thread, meaning that the returned string pointer may be invalided
881 or contents might be overwritten on subsequent calls in the same thread or
882 if the thread is terminated. It makes strerror MT-safe.
884 * Using weak references to libpthread functions such as pthread_create
885 or pthread_key_create to detect the singled-threaded nature of a
886 program is an obsolescent feature. Future versions of glibc will
887 define pthread_create within libc.so.6 itself, so such checks will
888 always flag the program as multi-threaded. Applications should check
889 the __libc_single_threaded variable declared in
890 <sys/single_threaded.h> instead.
892 * The "files" NSS module no longer supports the "key" database (used for
893 secure RPC). The contents of the /etc/publickey file will be ignored,
894 regardless of the settings in /etc/nsswitch.conf. (This method of
895 storing RPC keys only supported the obsolete and insecure AUTH_DES
896 flavor of secure RPC.)
898 * The __morecore and __after_morecore_hook malloc hooks and the default
899 implementation __default_morecore have been deprecated. Applications
900 should use malloc interposition to change malloc behavior, and mmap to
901 allocate anonymous memory. A future version of glibc may require that
902 applications which use the malloc hooks must preload a special shared
903 object, to enable the hooks.
905 * The hesiod NSS module has been deprecated and will be removed in a
906 future version of glibc. System administrators are encouraged to
907 switch to other approaches for networked account databases, such as
910 Changes to build and runtime requirements:
912 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
913 long double redirects.
915 Security related changes:
917 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
918 invoked with the -c option and when processing invalid multi-byte input
919 sequences. Reported by Jan Engelhardt.
921 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
922 corruption when they were passed a pseudo-zero argument. Reported by Guido
923 Vranken / ForAllSecure Mayhem.
925 CVE-2020-1752: A use-after-free vulnerability in the glob function when
926 expanding ~user has been fixed.
928 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
929 memmove functions has been fixed. Discovered by Jason Royes and Samual
930 Dytrych of the Cisco Security Assessment and Penetration Team (See
933 The following bugs are resolved with this release:
935 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
936 [10441] manual: Backtraces code example lacks error checking
937 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
938 timer_sigev_thread dangerous
939 [14231] stdio: stdio-common tests memory requirements
940 [14578] libc: /proc-based emulation for lchmod, fchmodat
941 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
942 filtee has constructor
943 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
944 sequences (CVE-2016-10228)
945 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
946 character entities for infinity & pi
947 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
948 segfaults in applications
949 [20543] libc: Please move from .gnu.linkonce to comdat
950 [22489] network: gcc warns about implicit convertion in
951 ICMP6_FILTER_SETPASS with -Wsign-conversion
952 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
953 [23294] math: Complex _FloatN functions are redirected to the wrong
954 function with -mlong-double-64
955 [23296] libc: Data race in setting function descriptor during lazy
957 [23668] dynamic-link: ldconfig: Default to the new format for
959 [23819] hurd: hurd: Add C11 thread support
960 [23990] build: test-container error out on failure to exec child.
961 [23991] build: shell-container typo in run_command_array
962 [24638] manual: Error in example of parsing a template string
963 [24654] manual: Wrong declaration of wcschr in libc manual
964 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
966 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
967 dynamically loaded dsos
968 [25098] nptl: nptl: ctype classification functions are not AS-Safe
969 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
971 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
972 restore EAX, ECX and EDX
973 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
974 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
975 [25420] network: Race condition in resolv_conf.c can result in caching
976 stale configuration forever
977 [25487] math: sinl() stack corruption from crafted input
979 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
981 [25523] libc: MIPS/Linux inline syscall template is miscompiled
982 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
984 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
985 on 32 bit and old kernel
986 [25635] libc: arm: Wrong sysdep order selection for soft-fp
987 [25639] localedata: Some names of days and months wrongly spelt in
989 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
990 amount of sigset_t bytes
991 [25691] stdio: printf: memory leak when printing long multibyte
993 [25715] libc: system() returns wrong errors when posix_spawn fails
994 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
995 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
996 state for conversions that produce two Unicode code points
997 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
998 for linux x86_64 leads to livelock
999 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1000 test failures, invalid instruction in ld.so
1001 [25790] glob: Typo in tst-fnmatch.input
1002 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1004 [25819] localedata: Update locale data to Unicode 13.0.0
1005 [25824] libc: Abnormal function of strnlen in aarch64
1006 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1007 [25896] libc: Incorrect prctl
1008 [25902] libc: Bad LOADARGS_N
1009 [25905] dynamic-link: VSX registers are corrupted during PLT
1010 resolution when glibc is built with --disable-multi-arch and --with-
1012 [25933] string: Off by one error in __strncmp_avx2 when
1013 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1015 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1016 exiting detached thread
1017 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1019 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1021 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1022 [26073] math: getpayload() has wrong return value
1023 [26076] dynamic-link: dlmopen crashes after failing to load
1024 dependencies in audit mode
1025 [26120] localedata: column width of of some Korean
1026 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1027 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1028 [26133] libc: Incorrect need_arch_feature_F16C
1029 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1031 [26149] libc: PKU is usable only if OSPKE is set
1032 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1034 [26208] libc: Incorrect bit_cpu_CLFSH
1035 [26210] network: Incorrect use of hidden symbols for global sunrpc
1037 [26211] stdio: printf integer overflow calculating allocation size
1038 [26214] stdio: printf_fp double free
1039 [26215] stdio: printf_fp memory leak
1040 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1041 [26258] nss: nss_compat should not read input files with mmap
1042 [26332] string: Incorrect cache line size load causes memory
1043 corruption in memset
1050 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1051 enable features from the draft ISO C2X standard. Only some features from
1052 this draft standard are supported by the GNU C Library, and as the draft
1053 is under active development, the set of features enabled by this macro is
1054 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1055 by compiling with "gcc -std=gnu2x".
1057 * The <math.h> functions that round their results to a narrower type now
1058 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1059 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1060 Clarification Request 13 to TS 18661-3.
1062 * The function pthread_clockjoin_np has been added, enabling join with a
1063 terminated thread with a specific clock. It allows waiting against
1064 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1066 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1068 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1069 in queries if the trust-ad option is set via the options directive in
1070 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1071 mode, the AD bit, as provided by the name server, is available to
1072 applications which call res_search and related functions. In the default
1073 mode, the AD bit is not set in queries, and it is automatically cleared in
1074 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1075 servers and the network path to them are treated as untrusted.)
1077 Deprecated and removed features, and other changes affecting compatibility:
1079 * The totalorder and totalordermag functions, and the corresponding
1080 functions for other floating-point types, now take pointer arguments to
1081 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1082 passing. This is in accordance with the resolution of Clarification
1083 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1084 floating-point arguments directly will continue to work.
1086 * The obsolete function stime is no longer available to newly linked
1087 binaries, and its declaration has been removed from <time.h>.
1088 Programs that set the system time should use clock_settime instead.
1090 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1091 in a future version of glibc. In this release, the header still exists
1092 but calling ftime will cause a compiler warning. All programs should use
1093 gettimeofday or clock_gettime instead.
1095 * The gettimeofday function no longer reports information about a
1096 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1097 many years, as it cannot handle the full complexity of the world's
1098 timezones, but hitherto we have supported it on a best-effort basis.
1099 Changes required to support 64-bit time_t on 32-bit architectures have
1100 made this no longer practical.
1102 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1103 should expect to receive a 'struct timezone' whose tz_minuteswest and
1104 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1105 happen on a few Linux-based ports. This will be corrected in a future
1108 All callers should supply a null pointer for the 'tzp' argument to
1109 gettimeofday. For accurate information about the time zone associated
1110 with the current time, use the localtime function.
1112 gettimeofday itself is obsolescent according to POSIX. We have no plans
1113 to remove access to this function, but portable programs should consider
1114 using clock_gettime instead.
1116 * The settimeofday function can still be used to set a system-wide time
1117 zone when the operating system supports it. This is because the Linux
1118 kernel reused the API, on some architectures, to describe a system-wide
1119 time-zone-like offset between the software clock maintained by the kernel,
1120 and the "RTC" clock that keeps time when the system is shut down.
1122 However, to reduce the odds of this offset being set by accident,
1123 settimeofday can no longer be used to set the time and the offset
1124 simultaneously. If both of its two arguments are non-null, the call
1125 will fail (setting errno to EINVAL).
1127 Callers attempting to set this offset should also be prepared for the call
1128 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1129 some Linux architectures. The Linux kernel maintainers are discussing a
1130 more principled replacement for the reused API. After a replacement
1131 becomes available, we will change settimeofday to fail with ENOSYS on all
1132 platforms when its 'tzp' argument is not a null pointer.
1134 settimeofday itself is obsolescent according to POSIX. Programs that set
1135 the system time should use clock_settime and/or the adjtime family of
1136 functions instead. We may cease to make settimeofday available to newly
1137 linked binaries after there is a replacement for Linux's time-zone-like
1140 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1141 the optional CAS instruction is implemented (for instance, LEON processors
1142 are still supported, but SuperSPARC processors are not).
1144 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1147 * If a lazy binding failure happens during dlopen, during the execution of
1148 an ELF constructor, the process is now terminated. Previously, the
1149 dynamic loader would return NULL from dlopen, with the lazy binding error
1150 captured in a dlerror message. In general, this is unsafe because
1151 resetting the stack in an arbitrary function call is not possible.
1153 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1154 executable stack unless explicitly configured at build time to require
1155 minimum kernel version 4.8 or newer. This is because executing
1156 floating-point branches on a non-executable stack on Linux kernels prior to
1157 4.8 can lead to application crashes for some MIPS configurations. While
1158 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1159 expected to enable non-executable stack by default with PT_GNU_STACK by
1160 default and is thus likely to trigger a crash on older kernels.
1162 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1163 non-executable stack while dropping support for older kernels.
1165 * System call wrappers for time system calls now use the new time64 system
1166 calls when available. On 32-bit targets, these wrappers attempt to call
1167 the new system calls first and fall back to the older 32-bit time system
1168 calls if they are not present. This may cause issues in environments
1169 that cannot handle unsupported system calls gracefully by returning
1170 -ENOSYS. Seccomp sandboxes are affected by this issue.
1172 Changes to build and runtime requirements:
1174 * It is no longer necessary to have recent Linux kernel headers to build
1175 working (non-stub) system call wrappers on all architectures except 64-bit
1176 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1178 * The ChangeLog file is no longer present in the toplevel directory of the
1179 source tree. ChangeLog files are located in the ChangeLog.old directory as
1180 ChangeLog.N where the highest N has the latest entries.
1182 Security related changes:
1184 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1185 out-of-bounds write when executed in a signal frame context.
1187 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1188 environment variable during program execution after a security
1189 transition, allowing local attackers to restrict the possible mapping
1190 addresses for loaded libraries and thus bypass ASLR for a setuid
1191 program. Reported by Marcin Kościelnicki.
1193 The following bugs are resolved with this release:
1195 [12031] localedata: iconv -t ascii//translit with Greek characters
1196 [15813] libc: Multiple issues in __gen_tempname
1197 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1198 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1199 [19767] libc: vdso is not used with static linking
1200 [19903] hurd: Shared mappings not being inherited by children processes
1201 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1202 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1204 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1205 Symbols-A/B Unicode blocks
1206 [23518] libc: Eliminate __libc_utmp_jump_table
1207 [24026] malloc: malloc_info() returns wrong numbers
1208 [24054] localedata: Many locales are missing date_fmt
1209 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1210 [24304] dynamic-link: Lazy binding failure during ELF
1211 constructors/destructors is not fatal
1212 [24376] libc: RISC-V symbol size confusion with _start
1213 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1215 [24824] libc: test-in-container does not install charmap files compatible
1217 [24844] regex: regex bad pointer / leakage if malloc fails
1218 [24867] malloc: Unintended malloc_info formatting changes
1219 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1220 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1221 [24882] libc: login: pututline uses potentially outdated cache
1222 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1223 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1225 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1227 [24930] dynamic-link: dlopen of PIE executable can result in
1228 _dl_allocate_tls_init assertion failure
1229 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1230 (stringop-overflow error)
1231 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1232 functions other can lead to crashes
1233 [24967] libc: jemalloc static linking causes runtime failure
1234 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1236 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1237 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1238 [25097] libc: new -Warray-bounds with GCC 10
1239 [25112] dynamic-link: dlopen must not make new objects accessible when it
1240 still can fail with an error
1241 [25139] localedata: Please add the new mnw_MM locale
1242 [25149] regex: Array bounds violation in proceed_next_node
1243 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1244 initialized correctly
1245 [25189] libc: glibc's __glibc_has_include causes issues with clang
1247 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1248 value to an unsigned
1249 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1250 binaries (CVE-2019-19126)
1251 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1253 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1255 [25232] string: <string.h> does not enable const correctness for strchr et
1257 [25233] localedata: Consider "." as the thousands separator for sl_SI
1259 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1260 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1261 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1263 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1264 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1266 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1267 (dl_initfirst) link map pointer
1268 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1269 [25423] libc: Array overflow in backtrace on powerpc
1270 [25425] network: Missing call to __resolv_context_put in
1271 getaddrinfo.c:gethosts
1278 * Unicode 12.1.0 Support: Character encoding, character type info, and
1279 transliteration tables are all updated to Unicode 12.1.0, using
1280 generator scripts contributed by Mike FABIAN (Red Hat).
1282 * The dynamic linker accepts the --preload argument to preload shared
1283 objects, in addition to the LD_PRELOAD environment variable.
1285 * The twalk_r function has been added. It is similar to the existing
1286 twalk function, but it passes an additional caller-supplied argument
1287 to the callback function.
1289 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1291 * Minguo (Republic of China) calendar support has been added as an
1292 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1295 * The entry for the new Japanese era has been added for ja_JP locale.
1297 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1298 pvalloc, memalign, and posix_memalign fail now with total object size
1299 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1300 pointer subtraction within the allocated object, where results might
1301 overflow the ptrdiff_t type.
1303 * The dynamic linker no longer refuses to load objects which reference
1304 versioned symbols whose implementation has moved to a different soname
1305 since the object has been linked. The old error message, symbol
1306 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1307 link time reference, is gone.
1309 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1310 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1311 functions. These behave similarly to their "timed" equivalents, but also
1312 accept a clockid_t parameter to determine which clock their timeout should
1313 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1314 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1315 time of the wait (unlike with pthread_condattr_setclock, which requires
1316 the clock choice at initialization time).
1318 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1319 work, new resolvers can use a second argument which can be extended in
1320 the future, currently it contains the AT_HWCAP2 value.
1322 Deprecated and removed features, and other changes affecting compatibility:
1324 * The copy_file_range function fails with ENOSYS if the kernel does not
1325 support the system call of the same name. Previously, user space
1326 emulation was performed, but its behavior did not match the kernel
1327 behavior, which was deemed too confusing. Applications which use the
1328 copy_file_range function can no longer rely on glibc to provide a fallback
1329 on kernels that do not support the copy_file_range system call, and if
1330 this function returns ENOSYS, they will need to use their own fallback.
1331 Support for copy_file_range for most architectures was added in version
1332 4.5 of the mainline Linux kernel.
1334 * The functions clock_gettime, clock_getres, clock_settime,
1335 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1336 for new applications (on architectures which had them). Instead, the
1337 definitions in libc will be used automatically, which have been available
1340 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1341 and <sys/stropts.h> have been removed.
1343 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1344 resolver flag (deprecated in glibc 2.25) have been removed.
1346 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1347 resolver have been removed from <resolv.h>.
1349 * With --enable-bind-now, installed programs are now linked with the
1352 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1353 configurations) has been removed, following the deprecation of this
1354 subarchitecture in version 8 of GCC, and its removal in version 9.
1356 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1357 header have been removed.
1359 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1360 deprecated and will be removed from a future version of glibc.
1361 Application should directly access /proc instead. For obtaining random
1362 bits, the getentropy function can be used.
1364 Changes to build and runtime requirements:
1366 * GCC 6.2 or later is required to build the GNU C Library.
1368 Older GCC versions and non-GNU compilers are still supported when
1369 compiling programs that use the GNU C Library.
1371 Security related changes:
1373 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1374 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1375 has undefined behavior. On x32, the size_t argument may be passed
1376 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1377 32 bits. When it happened with the sign bit of RDX register set,
1378 memcmp gave the wrong result since it treated the size argument as
1379 zero. Reported by H.J. Lu.
1381 CVE-2019-9169: Attempted case-insensitive regular-expression match
1382 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1383 over-read. Reported by Hongxu Chen.
1385 The following bugs are resolved with this release:
1387 [2872] locale: Transliteration Cyrillic -> ASCII fails
1388 [6399] libc: gettid() should have a wrapper
1389 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1390 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1391 [17396] localedata: globbing for locale by [[.collating-element.]]
1392 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1393 [18465] malloc: memusagestat is built using system C library
1394 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1395 invalid input drops valid char
1396 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1397 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1398 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1399 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1400 [23352] malloc: __malloc_check_init still defined in public header
1402 [23403] nptl: Wrong alignment of TLS variables
1403 [23501] libc: nftw() doesn't return dangling symlink's inode
1404 [23733] malloc: Check the count before calling tcache_get()
1405 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1407 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1408 [23844] nptl: pthread_rwlock_trywrlock results in hang
1409 [23983] argparse: Missing compat versions of argp_failure and argp_error
1410 for long double = double
1411 [23984] libc: Missing compat versions of err.h and error.h functions for
1412 long double = double
1413 [23996] localedata: Dutch salutations
1414 [24040] libc: riscv64: unterminated call chain in __thread_start
1415 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1417 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1418 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1420 [24114] regex: regexec buffer read overrun in "grep -i
1421 '\(\(\)*.\)*\(\)\(\)\1'"
1422 [24122] libc: Segfaults if 0 returned from la_version
1423 [24153] stdio: Some input functions do not react to stdin assignment
1424 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1425 RDX is set) (CVE-2019-7309)
1426 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1427 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1428 not the default "nor"
1429 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1430 false positives, change to modern flexible array
1431 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1432 instructions while maintaining the robust mutex list due to missing
1434 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1435 unnecessary librt dependencies
1436 [24200] localedata: Revert first_weekday removal in en_IE locale
1437 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1438 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1439 [24216] malloc: Check for large bin list corruption when inserting
1441 [24228] stdio: old x86 applications that use legacy libio crash on exit
1442 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1444 [24293] localedata: Missing Minguo calendar support for TW locales
1445 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1446 tt_RU (Tatar) locale
1447 [24307] localedata: Update locale data to Unicode 12.0.0
1448 [24323] dynamic-link: dlopen should not be able open PIE objects
1449 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1450 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1451 tt_RU (Tatar) locale
1452 [24370] localedata: Add lang_name for tt_RU locale
1453 [24372] locale: Binary locale files are not architecture independent
1454 [24394] time: strptime %Ey mis-parses final year of era
1455 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1457 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1459 [24531] malloc: Malloc tunables give tcache assertion failures
1460 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1462 [24535] localedata: Update locale data to Unicode 12.1.0
1463 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1464 kernels and break testing
1465 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1466 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1467 [-Werror=format-overflow=]
1468 [24570] libc: alpha: compat msgctl uses __IPC_64
1469 [24584] locale: Data race in __wcsmbs_clone_conv
1470 [24588] stdio: Remove codecvt vtables from libio
1471 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1473 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1474 [24632] stdio: Old binaries which use freopen with default stdio handles
1476 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1478 [24652] localedata: szl_PL spelling correction
1479 [24695] nss: nss_db: calling getpwent after endpwent crashes
1480 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1481 in /etc/nsswitch.conf
1482 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1483 [24740] libc: getdents64 type confusion
1484 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1485 always implemented in the same library
1486 [24744] libc: Remove copy_file_range emulation
1487 [24757] malloc: memusagestat is linked against system libpthread
1488 [24794] libc: Partial test suite run builds corrupt test-in-container
1496 * The getcpu wrapper function has been added, which returns the currently
1497 used CPU and NUMA node. This function is Linux-specific.
1499 * A new convenience target has been added for distribution maintainers
1500 to build and install all locales as directories with files. The new
1501 target is run by issuing the following command in your build tree:
1502 'make localedata/install-locale-files', with an optional DESTDIR
1503 to set the install root if you wish to install into a non-default
1504 configured location.
1506 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1508 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1509 for _GNU_SOURCE, to match BSD environments.
1511 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1512 indicates that it will abort the transaction prior to entering the kernel
1513 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1514 suspended, and this caused some undefined side-effects issues by aborting
1515 transactions manually. Glibc avoided it by abort transactions manually on
1516 each syscall, but it lead to performance issues on newer kernels where the
1517 HTM state is saved and restore lazily (the state being saved even when the
1518 process actually does not use HTM).
1520 * The functions posix_spawn_file_actions_addchdir_np and
1521 posix_spawn_file_actions_addfchdir_np have been added, enabling
1522 posix_spawn and posix_spawnp to run the new process in a different
1523 directory. These functions are GNU extensions. The function
1524 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1527 * The popen and system do not run atfork handlers anymore (BZ#17490).
1528 Although it is a possible POSIX violation, the POSIX rationale in
1529 pthread_atfork documentation regarding atfork handlers is to handle
1530 inconsistent mutex state after a fork call in a multi-threaded process.
1531 In both popen and system there is no direct access to user-defined mutexes.
1533 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1534 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1536 - C-SKY ABIV2 soft-float little-endian
1537 - C-SKY ABIV2 hard-float little-endian
1539 * strftime's default formatting of a locale's alternative year (%Ey)
1540 has been changed to zero-pad the year to a minimum of two digits,
1541 like "%y". This improves the display of Japanese era years during
1542 the first nine years of a new era, and is expected to be harmless
1543 for all other locales (only Japanese locales regularly have
1544 alternative year numbers less than 10). Zero-padding can be
1545 overridden with the '_' or '-' flags (which are GNU extensions).
1547 * As a GNU extension, the '_' and '-' flags can now be applied to
1548 "%EY" to control how the year number is formatted; they have the
1549 same effect that they would on "%Ey".
1551 Deprecated and removed features, and other changes affecting compatibility:
1553 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1554 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1556 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1557 in <sys/procfs.h>, has been corrected to match the type actually used by
1558 the Linux kernel. This affects the size and layout of that structure on
1559 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1561 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1562 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1563 defined in <sys/procfs.h>, has been corrected to match the type actually
1564 used by the Linux kernel. This affects the size and layout of those
1567 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1568 meant to scan a string and allocate space for it with malloc, is now
1569 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1570 defined. This extension conflicts with C99's use of '%a' to scan a
1571 hexadecimal floating-point number, which is now available to programs
1572 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1574 POSIX.1-2008 includes the feature of allocating a buffer for string input
1575 with malloc, using the modifier letter 'm' instead. Programs using
1576 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1577 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1578 C99 '%a' no longer need to avoid _GNU_SOURCE.
1580 GCC's -Wformat warnings can detect most uses of this extension, as long
1581 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1582 __attribute__ ((format (scanf, ...))).
1584 Changes to build and runtime requirements:
1586 * Python 3.4 or later is required to build the GNU C Library.
1588 * On most architectures, GCC 5 or later is required to build the GNU C
1589 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1591 Older GCC versions and non-GNU compilers are still supported when
1592 compiling programs that use the GNU C Library.
1594 Security related changes:
1596 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1597 denial of service due to resource exhaustion when processing getaddrinfo
1598 calls with crafted host names. Reported by Guido Vranken.
1600 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1601 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1602 happened, accessing the 32-bit size_t value as the full 64-bit register
1603 in the assembly string/memory functions would cause a buffer overflow.
1604 Reported by H.J. Lu.
1606 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1607 addresses with arbitrary trailing characters, potentially leading to data
1608 or command injection issues in applications.
1610 The following bugs are resolved with this release:
1612 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
1613 [10496] localedata: 12h time representation in multiple locales faulty
1614 [10797] localedata: it_IT locale numeric does not have a separator for
1616 [11319] libc: dprintf doesn't handle errors properly
1617 [16346] time: mktime: potentially unsafe use of localtime_offset
1618 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
1620 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
1621 posix_spawn_file_actions_addfchdir_np
1622 [17426] localedata: Indian locales: set the correct date format
1623 [17490] stdio: popen should not invoke atfork handlers
1624 [17783] libc: TIOCSER_TEMT conditions inconsistent
1625 [18040] regex: use-after-free in regexec/get_subexp
1626 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
1627 [20018] network: getaddrinfo should reject IP addresses with trailing
1628 characters (CVE-2016-10739)
1629 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
1630 [20271] libc: Missing "\n" in __libc_fatal calls
1631 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
1632 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
1633 pointer argument is non-NULL
1634 [21037] stdio: open_memstream and freopen
1635 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
1636 [21716] time: Crash in glibc's mktime in low-memory situations
1637 [22834] stdio: Subprocess forked by popen may crash in Linux when
1638 multithreads call popen
1639 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
1640 and pthread_create fails.
1641 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
1642 [23125] libc: riscv64: endless loop when throwing an exception from a
1644 [23275] nptl: Race in pthread_mutex_lock while promoting to
1645 PTHREAD_MUTEX_ELISION_NP.
1646 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
1648 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
1650 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
1652 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
1653 [23509] dynamic-link: CET enabled glibc is incompatible with the older
1655 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
1656 [23521] nss: get_next_alias nss_files file stream leak
1657 [23538] nptl: Hang in pthread_cond_broadcast
1658 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
1659 [23578] regex: Invalid memory access if regex pattern contains NUL byte
1660 [23579] libc: Errors misreported in preadv2
1661 [23597] build: support/test-container.c doesn't work with different
1663 [23603] time: mktime signed integer overflow on large timestamps
1664 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
1665 [23614] libc: powerpc: missing CFI register information in __mpn_*
1667 [23637] string: Generic strstr/strcasestr fails with huge needles
1668 [23640] libc: no way to easily clear FD_CLOEXEC in
1669 posix_spawn_file_actions_adddup2()
1670 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
1672 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
1674 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
1675 [23689] libc: Bug in documentation for rusage.ru_ixrss in
1676 bits/types/struct_rusage.h
1677 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
1679 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
1681 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
1682 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
1683 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
1685 [23724] localedata: Albanian date formats are incorrect
1686 [23735] math: libnldbl_nonshared.a references internal libm symbols
1687 [23740] localedata: kl_GL: Month names and date formats need update
1688 [23744] regex: regex refactorings to remove BE, avoid duplication
1689 [23745] time: mktime fix for Gnulib + coreutils
1690 [23758] time: Improve the width of alternate representation for year in
1692 [23783] libc: [mips] Missing CMSPAR bits/termios.h
1693 [23789] time: mktime does not set errno on failure
1694 [23791] localedata: Wrong monetary format for ca_ES locale
1695 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
1696 [23794] locale: c16rtomb does not handle surrogate pairs
1697 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
1698 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
1699 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
1700 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
1701 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
1702 [23862] libc: [sh] missing kernel-features.h undefines
1703 [23864] libc: [riscv] missing kernel-features.h undefines
1704 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
1705 [23907] malloc: Incorrect double-free malloc tcache check disregards
1707 [23913] libc: off-by-one in function maybe_script_execute in
1708 sysdeps/posix/spawni.c
1709 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
1710 [23923] locale: Add --no-hard-links option to localedef
1711 [23927] network: Linux if_nametoindex() does not close descriptor
1713 [23961] math: powf can overflow to inf without setting errno in non-
1714 nearest rounding mode
1715 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
1716 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
1717 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
1718 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
1719 [24011] localedata: Fixed small type in comment for locale bs_BA
1720 [24018] libc: gettext() may return NULL
1721 [24022] build: riscv build failure with Linux kernel 4.20-rc7
1722 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
1723 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
1725 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
1726 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
1728 [24046] localedata: en_US locale doesn't define date_fmt
1729 [24063] manual: @var{errno} should be @code{errno}
1730 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
1731 [24088] libc: VSCR field is not being correctly read in ucontext_t on
1733 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
1735 [24097] string: Can't use 64-bit register for size_t in assembly codes for
1737 [24110] hurd: SS_DISABLE never set in stack_t value returned by
1739 [24112] network: Do not send DNS queries for non-host names (where all
1740 answers will be rejected)
1741 [24130] libc: alpha __remqu corrupts $f3 register
1748 * The localization data for ISO 14651 is updated to match the 2016
1749 Edition 4 release of the standard, this matches data provided by
1750 Unicode 9.0.0. This update introduces significant improvements to the
1751 collation of Unicode characters. This release deviates slightly from
1752 the standard in that the collation element ordering for lowercase and
1753 uppercase LATIN script characters is adjusted to ensure that regular
1754 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
1755 is not matched by [a-z]. With the update many locales have been
1756 updated to take advantage of the new collation information. The new
1757 collation information has increased the size of the compiled locale
1758 archive or binary locales.
1760 * The GNU C Library can now be compiled with support for Intel CET, AKA
1761 Intel Control-flow Enforcement Technology. When the library is built
1762 with --enable-cet, the resulting glibc is protected with indirect
1763 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
1764 compatible with all existing executables and shared libraries. This
1765 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
1766 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
1767 capable of multi-byte NOPs, like x86-64 processors as well as Intel
1768 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
1769 x86_64 and x32 on non-CET processors. --enable-cet has been tested
1770 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
1773 * The GNU C Library now has correct support for ABSOLUTE symbols
1774 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
1775 relocated incorrectly or in some cases discarded. The GNU linker can
1776 make use of the newer semantics, but it must communicate it to the
1777 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
1778 field) to indicate such support is required.
1780 * Unicode 11.0.0 Support: Character encoding, character type info, and
1781 transliteration tables are all updated to Unicode 11.0.0, using
1782 generator scripts contributed by Mike FABIAN (Red Hat).
1784 * <math.h> functions that round their results to a narrower type are added
1785 from TS 18661-1:2014 and TS 18661-3:2015:
1787 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
1788 fMxaddfNx functions.
1790 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
1791 fMxsubfNx functions.
1793 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
1794 fMxmulfNx functions.
1796 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
1797 fMxdivfNx functions.
1799 * Two grammatical forms of month names are now supported for the following
1800 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
1801 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
1802 support two grammatical forms in abbreviated month names: Catalan, Greek,
1805 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
1806 include the support for two grammatical forms of month names.
1808 * Building and running on GNU/Hurd systems now works without out-of-tree
1811 * The renameat2 function has been added, a variant of the renameat function
1812 which has a flags argument. If the flags are zero, the renameat2 function
1813 acts like renameat. If the flag is not zero and there is no kernel
1814 support for renameat2, the function will fail with an errno value of
1815 EINVAL. This is different from the existing gnulib function renameatu,
1816 which performs a plain rename operation in case of a RENAME_NOREPLACE
1817 flags and a non-existing destination (and therefore has a race condition
1818 that can clobber the destination inadvertently).
1820 * The statx function has been added, a variant of the fstatat64
1821 function with an additional flags argument. If there is no direct
1822 kernel support for statx, glibc provides basic stat support based on
1823 the fstatat64 function.
1825 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
1826 library if installed. libidn2 version 2.0.5 or later is recommended. If
1827 libidn2 is not available, internationalized domain names are not encoded
1828 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
1829 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
1830 with an encoding error.) Flags which used to change the IDN encoding and
1831 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
1832 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
1833 deprecated. They no longer have any effect.
1835 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
1836 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
1837 range of ELF gABI expressions including such constructs as
1838 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
1839 have been further restricted, and where in the past a dynamic string
1840 token sequence may have been interpreted as a literal string it will
1841 now cause a load failure. These load failures were always considered
1842 unspecified behaviour from the perspective of the dynamic loader, and
1843 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
1844 results in a load failure now.
1846 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
1847 implementation includes all the standard functions provided by
1850 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
1851 thrd_detach, thrd_exit, and thrd_join for thread management.
1853 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
1854 mtx_destroy for mutual exclusion.
1856 - call_once for function call synchronization.
1858 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
1859 cnd_wait for conditional variables.
1861 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
1863 Application developers must link against libpthread to use ISO C threads.
1865 Deprecated and removed features, and other changes affecting compatibility:
1867 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
1868 installed. Software that was using either header should be updated to
1869 use standard <stdio.h> interfaces instead.
1871 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
1872 This was never required by the C standard, and the macros just expanded
1873 to call alternative names for the same functions. If you hoped getc and
1874 putc would provide performance improvements over fgetc and fputc, instead
1875 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
1876 necessary, flockfile and funlockfile.
1878 * All stdio functions now treat end-of-file as a sticky condition. If you
1879 read from a file until EOF, and then the file is enlarged by another
1880 process, you must call clearerr or another function with the same effect
1881 (e.g. fseek, rewind) before you can read the additional data. This
1882 corrects a longstanding C99 conformance bug. It is most likely to affect
1883 programs that use stdio to read interactive input from a terminal.
1886 * The macros 'major', 'minor', and 'makedev' are now only available from
1887 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
1888 headers that happen to include <sys/types.h>. These macros are rarely
1889 used, not part of POSIX nor XSI, and their names frequently collide with
1890 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
1891 further explanation.
1893 <sys/sysmacros.h> is a GNU extension. Portable programs that require
1894 these macros should first include <sys/types.h>, and then include
1895 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
1897 * The tilegx*-*-linux-gnu configurations are no longer supported.
1899 * The obsolete function ustat is no longer available to newly linked
1900 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
1901 function has been deprecated in favor of fstatfs and statfs.
1903 * The obsolete function nfsservctl is no longer available to newly linked
1904 binaries. This function was specific to systems using the Linux kernel
1905 and could not usefully be used with the GNU C Library on systems with
1906 version 3.1 or later of the Linux kernel.
1908 * The obsolete function name llseek is no longer available to newly linked
1909 binaries. This function was specific to systems using the Linux kernel
1910 and was not declared in a header. Programs should use the lseek64 name
1911 for this function instead.
1913 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
1914 getaddrinfo and getnameinfo functions have been deprecated. The behavior
1915 previously selected by them is now always enabled.
1917 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
1918 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
1919 restriction (rejecting '_' in host names, among other things) has been
1920 removed, for increased compatibility with non-IDN name resolution.
1922 * The fcntl function now have a Long File Support variant named fcntl64. It
1923 is added to fix some Linux Open File Description (OFD) locks usage on non
1924 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
1925 fcntl and LFS support is handled transparently. Also for Linux, the OFD
1926 locks act as a cancellation entrypoint.
1928 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
1929 ecb_crypt, and des_setparity are no longer available to newly linked
1930 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
1931 longer installed. These functions encrypted and decrypted data with the
1932 DES block cipher, which is no longer considered secure. Software that
1933 still uses these functions should switch to a modern cryptography library,
1936 * Reflecting the removal of the encrypt and setkey functions above, the
1937 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
1938 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
1941 * The obsolete function fcrypt is no longer available to newly linked
1942 binaries. It was just another name for the standard function crypt,
1943 and it has not appeared in any header file in many years.
1945 * We have tentative plans to hand off maintenance of the passphrase-hashing
1946 library, libcrypt, to a separate development project that will, we hope,
1947 keep up better with new passphrase-hashing algorithms. We will continue
1948 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
1949 'crypt_r' should not need to change at all; however, distributions will
1950 need to install <crypt.h> and libcrypt from a separate project.
1952 In this release, if the configure option --disable-crypt is used, glibc
1953 will not install <crypt.h> or libcrypt, making room for the separate
1954 project's versions of these files. The plan is to make this the default
1955 behavior in a future release.
1957 Changes to build and runtime requirements:
1959 GNU make 4.0 or later is now required to build glibc.
1961 Security related changes:
1963 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
1964 been fixed by removing the glibc-internal IDNA implementation and using
1965 the system-provided libidn2 library instead. Originally reported by Hanno
1966 Böck and Christian Weisgerber.
1968 CVE-2017-18269: An SSE2-based memmove implementation for the i386
1969 architecture could corrupt memory. Reported by Max Horn.
1971 CVE-2018-11236: Very long pathname arguments to realpath function could
1972 result in an integer overflow and buffer overflow. Reported by Alexey
1975 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
1976 architecture could write beyond the target buffer, resulting in a buffer
1977 overflow. Reported by Andreas Schwab.
1979 The following bugs are resolved with this release:
1981 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
1982 [6889] manual: 'PWD' mentioned but not specified
1983 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
1984 when __WORDSIZE != 64
1985 [13762] regex: re_search etc. should return -2 on memory exhaustion
1986 [13888] build: /tmp usage during testing
1987 [13932] math: dbl-64 pow unexpectedly slow for some inputs
1988 [14092] nptl: Support C11 threads
1989 [14095] localedata: Review / update collation data from Unicode / ISO
1991 [14508] libc: -Wformat warnings
1992 [14553] libc: Namespace pollution loff_t in sys/types.h
1993 [14890] libc: Make NT_PRFPREG canonical.
1994 [15105] libc: Extra PLT references with -Os
1995 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
1997 [16335] manual: Feature test macro documentation incomplete and out of
1999 [16552] libc: Unify umount implementations in terms of umount2
2000 [17082] libc: htons et al.: statement-expressions prevent use on global
2001 scope with -O1 and higher
2002 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2003 [17438] localedata: pt_BR: wrong d_fmt delimiter
2004 [17662] libc: please implement binding for the new renameat2 syscall
2005 [17721] libc: __restrict defined as /* Ignore */ even in c11
2006 [17979] libc: inconsistency between uchar.h and stdint.h
2007 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2008 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2009 horrible machine code)
2010 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2012 [18471] libc: llseek should be a compat symbol
2013 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2015 [18991] nss: nss_files skips large entry in database
2016 [19239] libc: Including stdlib.h ends up with macros major and minor being
2018 [19463] libc: linknamespace failures when compiled with -Os
2019 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2020 [19527] locale: Normalized charset name not recognized by setlocale
2021 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2022 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2024 [19728] network: out of bounds stack read in libidn function
2025 idna_to_ascii_4i (CVE-2016-6261)
2026 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2027 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2028 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2030 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2031 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2032 [20419] dynamic-link: files with large allocated notes crash in
2034 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2035 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2036 [20980] manual: CFLAGS environment variable replaces vital options
2037 [21163] regex: Assertion failure in pop_fail_stack when executing a
2038 malformed regexp (CVE-2015-8985)
2039 [21234] manual: use of CFLAGS makes glibc detect no optimization
2040 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2041 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2042 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2043 [21508] locale: intl/tst-gettext failure with latest msgfmt
2044 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2045 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2046 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2048 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2050 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2051 [22247] network: Integer overflow in the decode_digit function in
2052 puny_decode.c in libidn (CVE-2017-14062)
2053 [22342] nscd: NSCD not properly caching netgroup
2054 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2055 [22550] localedata: es_ES locale (and other es_* locales): collation
2056 should treat ñ as a primary different character, sync the collation
2057 for Spanish with CLDR
2058 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2059 by gcc configured with --enable-default-pie
2060 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2061 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2062 crossing 2GB threshold (CVE-2017-18269)
2063 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2065 [22735] time: Misleading typo in time.h source comment regarding
2067 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2068 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2069 `__assert_perror_fail ()' to `__assert_fail_base ()'
2070 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2072 [22786] libc: Stack buffer overflow in realpath() if input size is close
2073 to SSIZE_MAX (CVE-2018-11236)
2074 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2075 through an absolute DT_NEEDED path
2076 [22792] build: tcb-offsets.h dependency dropped
2077 [22797] libc: pkey_get() uses non-reserved name of argument
2078 [22807] libc: PTRACE_* constants missing for powerpc
2079 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2080 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2081 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2082 [22848] localedata: ca_ES: update date definitions from CLDR
2083 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2084 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2085 [22896] localedata: Update locale data for an_ES
2086 [22902] math: float128 test failures with GCC 8
2087 [22918] libc: multiple common of `__nss_shadow_database'
2088 [22919] libc: sparc32: backtrace yields infinite backtrace with
2090 [22926] libc: FTBFS on powerpcspe
2091 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2093 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2094 [22947] libc: FAIL: misc/tst-preadvwritev2
2095 [22963] localedata: cs_CZ: Add alternative month names
2096 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2097 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2098 [22998] dynamic-link: execstack tests are disabled when SELinux is
2100 [23005] network: Crash in __res_context_send after memory allocation
2102 [23007] math: strtod cannot handle -nan
2103 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2104 [23036] regex: regex equivalence class regression
2105 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2106 [23069] libc: sigaction broken on riscv64-linux-gnu
2107 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2108 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2109 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2110 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2111 and libc build with -Os)
2112 [23140] localedata: More languages need two forms of month names
2113 [23145] libc: _init/_fini aren't marked as hidden
2114 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2115 [23171] math: C++ iseqsig for long double converts arguments to double
2116 [23178] nscd: sudo will fail when it is run in concurrent with commands
2117 that changes /etc/passwd
2118 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2120 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2121 [23208] localedata: New locale - Lower Sorbian (dsb)
2122 [23233] regex: Memory leak in build_charclass_op function in file
2124 [23236] stdio: Harden function pointers in _IO_str_fields
2125 [23250] nptl: Offset of __private_ss differs from GCC
2126 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2127 -mtune=generic -mfpmath=sse
2128 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2130 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2131 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2133 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2134 [23277] math: nan function should not have const attribute
2135 [23279] math: scanf and strtod wrong for some hex floating-point
2136 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2138 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2139 [23303] build: undefined reference to symbol
2140 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2141 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2143 [23313] stdio: libio vtables validation and standard file object
2145 [23329] libc: The __libc_freeres infrastructure is not properly run across
2147 [23349] libc: Various glibc headers no longer compatible with
2149 [23351] malloc: Remove unused code related to heap dumps and malloc
2151 [23363] stdio: stdio-common/tst-printf.c has non-free license
2152 [23396] regex: Regex equivalence regression in single-byte locales
2153 [23422] localedata: oc_FR: More updates of locale data
2154 [23442] build: New warning with GCC 8
2155 [23448] libc: Out of bounds access in IBM-1390 converter
2156 [23456] libc: Wrong index_cpu_LZCNT
2157 [23458] build: tst-get-cpu-features-static isn't added to tests
2158 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2160 [23467] dynamic-link: x86/CET: A property note parser bug
2167 * The GNU C Library can now be compiled with support for building static
2168 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2169 executables are like static executables but can be loaded at any address
2170 and provide additional security hardening benefits at the cost of some
2171 memory and performance. When the library is built with --enable-static-pie
2172 the resulting libc.a is usable with GCC 8 and above to create static PIE
2173 executables using the GCC option '-static-pie'. This feature is currently
2174 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2175 aarch64 with binutils 2.30 or later.
2177 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2178 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2181 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2183 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2185 * In order to support faster and safer process termination the malloc API
2186 family of functions will no longer print a failure address and stack
2187 backtrace after detecting heap corruption. The goal is to minimize the
2188 amount of work done after corruption is detected and to avoid potential
2189 security issues in continued process execution. Reducing shutdown time
2190 leads to lower overall process restart latency, so there is benefit both
2191 from a security and performance perspective.
2193 * The abort function terminates the process immediately, without flushing
2194 stdio streams. Previous glibc versions used to flush streams, resulting
2195 in deadlocks and further data corruption. This change also affects
2196 process aborts as the result of assertion failures.
2198 * On platforms where long double has the IEEE binary128 format (aarch64,
2199 alpha, mips64, riscv, s390 and sparc), the math library now implements
2200 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2201 These are the same interfaces added in version 2.26 for some platforms where
2202 this format is supported but is not the format of long double.
2204 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2205 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2206 implements interfaces for that type, as defined by ISO/IEC TS
2207 18661-3:2015. These are corresponding interfaces to those supported for
2210 * The math library now implements interfaces for the _Float32, _Float64 and
2211 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2212 corresponding interfaces to those supported for _Float128.
2214 * glibc now implements the memfd_create and mlock2 functions on Linux.
2216 * Support for memory protection keys was added. The <sys/mman.h> header now
2217 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2220 * The copy_file_range function was added.
2222 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2224 * The ldconfig utility now processes `include' directives using the C/POSIX
2225 collation ordering. Previous glibc versions used locale-specific
2226 ordering, the change might break systems that relied on that.
2228 * Support for two grammatical forms of month names has been added.
2229 In a call to strftime, the "%B" and "%b" format specifiers will now
2230 produce the grammatical form required when the month is used as part
2231 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2232 required when the month is named by itself. For instance, in Greek
2233 and in many Slavic and Baltic languages, "%B" will produce the month
2234 in genitive case, and "%OB" will produce the month in nominative case.
2236 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2237 are all valid and will all accept any known form of month
2238 name---standalone or complete, abbreviated or full. In a call to
2239 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2240 the strings used by "%B" and "%b", respectively. New query
2241 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2242 used by "%OB" and "%Ob", respectively.
2244 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2245 define the strings for %OB and %Ob, respectively; these have the
2246 same syntax as "mon" and "abmon". These arrays are optional; if they
2247 are not provided then they have the same content as "mon" and "abmon",
2250 These features are provided for locales which define "alt_mon" and/or
2251 "ab_alt_mon" in their locale source data. This release includes such
2252 alternative month name data for the following languages: Belarusian,
2253 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2255 This feature is currently a GNU extension, but it is expected to
2256 be added to the next revision of POSIX, and it is also already
2257 available on some BSD-derived operating systems.
2259 This feature will cause existing statically compiled applications
2260 to fail to load locales and fall back to the builtin C/POSIX locales.
2261 See notes below for other changes affecting compatibility.
2263 * Support for the RISC-V ISA running on Linux has been added. This port
2264 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2265 for the following ISA and ABI pairs:
2271 Deprecated and removed features, and other changes affecting compatibility:
2273 * Statically compiled applications attempting to load locales compiled for the
2274 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2275 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2276 support for two grammatical forms of the month names, also extends the locale
2277 data binary format. Static applications needing locale support must be
2278 recompiled to match the runtime and data they are deployed with. In some
2279 distributions there is an upgrade window where dynamically linked applications
2280 may use a new library but the old locale data and also fall back to the
2281 builtin C/POSIX locales; restarting the application process is sufficient to
2284 * Support for statically linked applications which call dlopen is deprecated
2285 and will be removed in a future version of glibc. Applications which call
2286 dlopen need to be linked dynamically instead.
2288 * Support for old programs which use internal stdio data structures and
2289 functions is deprecated. This includes programs which use the C++ streams
2290 provided by libstdc++ in GCC 2.95. Programs which use the internal
2291 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2292 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2293 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2294 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2295 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2296 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2297 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2298 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2299 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2300 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2301 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2302 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2303 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2304 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2305 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2306 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2307 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2308 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2309 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2310 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2311 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2312 future version of glibc. Unlike other symbol removals, these old
2313 applications will not be supported using compatibility symbols.
2315 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2316 defined by <sys/ptrace.h>.
2318 * libm no longer supports SVID error handling (calling a user-provided
2319 matherr function on error) or the _LIB_VERSION variable to control error
2320 handling. (SVID error handling and the _LIB_VERSION variable still work
2321 for binaries linked against older versions of the GNU C Library.) The
2322 libieee.a library is no longer provided. math.h no longer defines struct
2323 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2324 TLOSS, PLOSS and HUGE.
2326 * The libm functions pow10, pow10f and pow10l are no longer supported for
2327 new programs. Programs should use the standard names exp10, exp10f and
2328 exp10l for these functions instead.
2330 * The mcontext_t type is no longer the same as struct sigcontext. On
2331 platforms where it was previously the same, this changes the C++ name
2332 mangling for interfaces involving this type.
2334 * The add-ons mechanism for building additional packages at the same time as
2335 glibc has been removed. The --enable-add-ons configure option is now
2338 * The --without-fp configure option is now ignored. Whether hardware
2339 floating-point instructions are used is now configured based on whether
2340 the compiler used at configure time (without any options implied by a
2341 --with-cpu= configure option) uses such instructions.
2343 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2344 the specified string can be parsed as a domain name.
2346 * In the malloc_info output, the <heap> element may contain another <aspace>
2347 element, "subheaps", which contains the number of sub-heaps.
2349 * The libresolv function p_secstodate is no longer supported for new
2352 * The tilepro-*-linux-gnu configuration is no longer supported.
2354 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2355 and will be removed in a future release. Software that is still using
2356 either header should be updated to use standard <stdio.h> interfaces
2359 libio.h was originally the header for a set of supported GNU extensions,
2360 but they have not been maintained as such in many years, they are now
2361 standing in the way of improvements to stdio, and we don't think there are
2362 any remaining external users. _G_config.h was never intended for public
2363 use, but predates the bits convention.
2365 Changes to build and runtime requirements:
2367 * bison version 2.7 or later is required to generate code in the 'intl'
2370 Security related changes:
2372 CVE-2009-5064: The ldd script would sometimes run the program under
2373 examination directly, without preventing code execution through the
2374 dynamic linker. (The glibc project disputes that this is a security
2375 vulnerability; only trusted binaries must be examined using the ldd
2378 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2379 suffered from a one-byte overflow during ~ operator processing (either
2380 on the stack or the heap, depending on the length of the user name).
2381 Reported by Tim Rühsen.
2383 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2384 would sometimes fail to free memory allocated during ~ operator
2385 processing, leading to a memory leak and, potentially, to a denial
2388 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2389 without GLOB_NOESCAPE, could write past the end of a buffer while
2390 unescaping user names. Reported by Tim Rühsen.
2392 CVE-2017-17426: The malloc function, when called with an object size near
2393 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2394 instead of NULL. This was a regression introduced with the new malloc
2395 thread cache in glibc 2.26. Reported by Iain Buclaw.
2397 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2398 to the allocation of too much memory. (This is not a security bug per se,
2399 it is mentioned here only because of the CVE assignment.) Reported by
2402 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2403 of the number of search path components. (This is not a security
2404 vulnerability per se because no trust boundary is crossed if the fix for
2405 CVE-2017-1000366 has been applied, but it is mentioned here only because
2406 of the CVE assignment.) Reported by Qualys.
2408 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2409 for AT_SECURE or SUID binaries could be used to load libraries from the
2412 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2413 succeeds without returning an absolute path due to unexpected behaviour
2414 of the Linux kernel getcwd syscall. Reported by halfdog.
2416 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2417 an object size near the value of SIZE_MAX, would return a pointer to a
2418 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2420 CVE-2018-6551: The malloc function, when called with an object size near
2421 the value of SIZE_MAX, would return a pointer to a buffer which is too
2422 small, instead of NULL.
2424 The following bugs are resolved with this release:
2426 [866] glob: glob should match dangling symlinks
2427 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2428 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2430 [5997] math: Very slow execution of sinf function
2431 [10580] localedata: hr_HR: updated locale
2432 [10871] locale: 'mon' array should contain both nominative and genitive
2434 [12349] localedata: eu_ES: incorrect thousands separator
2435 [13605] localedata: shn_MM: new Shan locale
2436 [13805] localedata: ru_RU: currency should use ',' as radix point
2437 [13953] localedata: km_KH: locale update
2438 [13994] localedata: mjw_IN: new locale
2439 [14121] build: make writes .mo files in po directory
2440 [14333] libc: Fix the race between atexit() and exit()
2441 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2442 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2444 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2445 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2446 width Latin characters
2447 [15332] localedata: es_CU: locale update
2448 [15436] stdio: Don't close or flush stdio streams on abort
2449 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2451 [16148] localedata: ca_ES: incorrect thousands separator
2452 [16750] dynamic-link: ldd should not try to execute the binaries
2454 [16777] localedata: pl_PL: incorrect thousands separator in locale
2455 [16905] localedata: hanzi: new collation
2456 [17563] localedata: cmn_TW: add hanzi collation
2457 [17750] localedata: wrong collation order of diacritics in most locales
2458 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2460 [17956] build: Build fails on missing definitions from header file
2461 nss/nss.h when Mozilla NSS is used for cryptography
2462 [18203] libc: realpath() does not handle unreachable paths correctly
2463 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2464 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2465 [18822] libc: Internal functions are called via PLT
2466 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2467 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2468 [19574] libc: glibc should support building static PIE binaries
2469 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2471 [19971] glob: glob: Do not skip entries with zero d_ino values
2472 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2473 [20008] localedata: km_KH: convert to translit_neutral
2474 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2475 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2476 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2477 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2478 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2480 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2481 they're set, wrong errors returned by gaih_inet when lookup functions
2483 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2484 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2486 [20952] localedata: yuw_PG: new locale
2487 [21084] localedata: charmaps/IBM858: new codepage
2488 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2489 [21242] libc: assert gives pedantic warning in old gcc versions
2490 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2491 __regcall calling convention
2492 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2493 [21326] libc: C99 functions are not declared for C++11 and later if
2494 _GNU_SOURCE is not predefined by g++
2495 [21457] libc: sys/ucontext.h namespace
2496 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2497 [21660] math: GCC fails to compile a formula with tgmath.h
2498 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2499 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2500 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2501 [21684] math: tgmath.h handling of complex integers
2502 [21685] math: tgmath.h handling of bit-fields
2503 [21686] math: tgmath.h handling of __int128
2504 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2506 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2508 [21750] localedata: column width of characters incompatible with classical
2510 [21754] malloc: malloc: Perform as little work as possible after heap
2511 consistency check failures
2512 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2513 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2514 [21791] string: Unused XXX_chk_XXX functions in libc.a
2515 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2517 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2519 [21845] localedata: Added new Locale bho_NP
2520 [21853] localedata: Fix abday Which looks same as day in zh_SG
2521 [21854] localedata: Added New Locale en_SC
2522 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2523 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2524 _dl_runtime_resolve_avx_slow
2525 [21885] network: getaddrinfo: gethosts does not release resolver context
2526 on memory allocation failure
2527 [21899] libc: XPG4.2 sigaction namespace
2528 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2530 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2532 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2533 errno value, causing getaddrinfo to fail
2534 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2535 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2536 instead of EAI_NODATA
2537 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2538 constant PTRACE_SEIZE_DEVEL
2539 [21930] math: C-only gcc builtins used in <math.h> isinf
2540 [21932] network: Unpaired __resolv_context_get in generic get*_r
2542 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2543 [21944] libc: sigval namespace
2544 [21951] localedata: Update hanzi collation by stroke
2545 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2546 sysdeps/x86_64/fpu/e_expf.S
2547 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2548 allocation in syscall loops)
2549 [21959] localedata: Fix Country name for xh_ZA
2550 [21960] localedata: Fix abmon for bem_ZM
2551 [21966] math: AVX2 mathvec functions use FMA without checking
2552 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2553 [21971] localedata: Added New Locale for mfe_MU
2554 [21972] libc: assert macro requires operator== (int) for its argument type
2555 [21973] math: [sparc] libm missing sqrtl compat symbol
2556 [21974] libc: Remove __bb_init_func and __bb_exit_func
2557 [21982] string: stratcliff.c: error: assuming signed overflow does not
2559 [21986] stdio: __guess_grouping is called incorrectly
2560 [21987] math: [sparc32] wrong bits/long-double.h installed
2561 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2563 [22022] localedata: Missing country_name for mni_IN
2564 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2566 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2568 [22026] locale: iconv_open: heap overflow on gconv_init failure
2569 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2570 [22035] math: [m68k] bits/math-inline.h macro namespace
2571 [22038] localedata: Fix abbreviated weeks and months for Somali
2572 [22044] localedata: Remove redundant data for Limburgish Language
2573 [22050] malloc: Linking with -lmcheck does not hook
2574 __malloc_initialize_hook correctly
2575 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2576 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2577 [22070] localedata: charmaps/UTF-8: wcwidth for
2578 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2579 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2580 Jungseong and Jongseong) should be 0
2581 [22078] nss: nss_files performance issue in multi mode
2582 [22082] math: bits/math-finite.h exp10 condition
2583 [22086] libc: pcprofiledump incorrect cross-endian condition
2584 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2585 [22095] network: Name server address allocation memory leak in resolv.conf
2587 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2589 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2590 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2592 [22111] malloc: malloc: per thread cache is not returned when thread exits
2593 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2594 [22134] libc: [linux] implement fexecve with execveat
2595 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2597 [22145] libc: ttyname() gives up too early in the face of namespaces
2598 [22146] math: C++ build issue with float128 on x86_64
2599 [22153] nptl: nptl: save error code before process termination
2600 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2601 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2602 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2603 [22165] libc: [hppa] Text relocations in libc.so
2604 [22180] libc: destructor registered via __cxa_atexit is called twice
2605 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2606 symlinks") cause "make" segfaults
2607 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2609 [22207] libc: FAIL: stdlib/test-atexit-race
2610 [22225] math: nearbyint arithmetic moved before feholdexcept
2611 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
2612 [22235] math: iscanonical in C++ and float128
2613 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
2614 the svid compat wrapper
2615 [22244] math: ynf and yn are wrong without the svid compat wrapper
2616 [22273] libc: Improper assert in Linux posix_spawn implementation
2617 [22284] libc: -pg -pie doesn't work
2618 [22292] locale: localedef exits with error 4 when it should be error 1
2619 [22294] locale: Allow "" for int_currency_symbol definition in locales.
2620 [22295] locale: Don't warn on non-symbolic characters in locale sources in
2622 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
2623 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
2625 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
2626 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
2627 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
2628 [22322] libc: [mips64] wrong bits/long-double.h installed
2629 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
2630 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
2632 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
2633 [22343] malloc: Integer overflow in posix_memalign
2634 [22347] libc: getrandom() returns the number of bytes that were copied to
2635 the buffer even though the comments say "Return 0 on success and -1 on
2637 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
2638 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
2640 [22370] dynamic-link: Incorrect note padding check
2641 [22375] libc: malloc returns pointer from tcache_get when should return
2642 NULL (CVE-2017-17426)
2643 [22377] math: iseqsig, float128 and C++
2644 [22382] localedata: Error in tpi_PG locale
2645 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
2646 inside the ASCII printable range
2647 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
2649 [22403] localedata: Slash needs escaping in some locales
2650 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
2651 [22409] network: res_hnok does not accept some host names used on the
2653 [22412] network: res_dnok, res_hnok should perform syntax checks
2654 [22413] network: ns_name_pton ignores syntactically invalid trailing
2656 [22415] stdio: setvbuf can lead to invalid free/segfault
2657 [22432] build: Non-deterministic build
2658 [22439] malloc: malloc_info should compute summary statistics for all sub-
2660 [22442] network: if_nametoindex could report index for the wrong
2661 networking interface
2662 [22446] build: aliasing violation calling readlink in handle_request
2663 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
2664 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
2665 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
2666 __nscd_hash/__nss_hash
2667 [22463] network: p_secstodate overflow handling
2668 [22469] localedata: pl_PL LC_COLLATE does not use i18n
2669 [22478] libc: sigwait can fail with EINTR
2670 [22505] libc: ldconfig processes include directive in locale-specific
2672 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
2673 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
2674 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
2675 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
2676 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
2677 [22534] localedata: Collation rules for Serbian and Bosnian should be the
2678 same as for Croatian
2679 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
2680 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
2681 [22577] libc: missing newline after "cannot allocate TLS data structures
2683 [22588] manual: manual/conf.texi: missing underscore in front of
2685 [22593] math: nextafter and nexttoward are declared with const attribute
2686 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
2687 [22603] string: ia64 memchr overflows internal pointer check
2688 [22605] libc: SH clone does not set the exit code correctly
2689 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
2691 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
2692 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
2693 modified in case of success
2694 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
2695 [22615] manual: manual: ambiguous wording about errno value in case of
2697 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
2699 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
2700 binaries or if /proc is not mounted (CVE-2017-16997)
2701 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
2702 [22630] build: $(no-pie-ldflag) is no longer effective
2703 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
2704 [22635] nptl: pthread_self returns NULL before libpthread is loaded
2705 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
2706 [22637] nptl: guard size is subtracted from thread stack size instead of
2708 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
2709 [22657] localedata: hu_HU: Avoid double space in date
2710 [22660] math: fmax, fmin sNaN handling on alpha
2711 [22664] libc: New warning of GCC8
2712 [22665] math: alpha: ceil and floor raise inexact exceptions
2713 [22666] math: alpha: trunc raise inexact exceptions
2714 [22667] libc: makecontext lacks stack alignment on i386
2715 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
2716 [22679] libc: getcwd(3) can succeed without returning an absolute path
2718 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
2719 elision and tunables
2720 [22687] math: [powerpc-nofpu] complex long double functions spurious
2722 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
2723 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
2724 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
2726 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
2727 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
2729 [22701] nis: Incomplete removal of libnsl
2730 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
2731 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
2732 [22715] dynamic-link: FAIL: elf/tst-audit10
2733 [22719] libc: Backtrace tests fail on hppa
2734 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
2735 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
2736 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
2737 before the first call to crypt_r () in crypt/badsalttest.c
2744 * A per-thread cache has been added to malloc. Access to the cache requires
2745 no locks and therefore significantly accelerates the fast path to allocate
2746 and free small amounts of memory. Refilling an empty cache requires locking
2747 the underlying arena. Performance measurements show significant gains in a
2748 wide variety of user workloads. Workloads were captured using a special
2749 instrumented malloc and analyzed with a malloc simulator. Contributed by
2750 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
2752 * Unicode 10.0.0 Support: Character encoding, character type info, and
2753 transliteration tables are all updated to Unicode 10.0.0, using
2754 generator scripts contributed by Mike FABIAN (Red Hat).
2755 These updates cause user visible changes, especially the changes in
2756 wcwidth for many emoji characters cause problems when emoji sequences
2757 are rendered with pango, see for example:
2758 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
2760 * Collation of Hungarian has been overhauled and is now consistent with "The
2761 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
2764 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
2766 - The GNU C Library will now detect when /etc/resolv.conf has been
2767 modified and reload the changed configuration. The new resolver option
2768 “no-reload” (RES_NORELOAD) disables this behavior.
2770 - The GNU C Library now supports an arbitrary number of search domains
2771 (configured using the “search” directive in /etc/resolv.conf);
2772 previously, there was a hard limit of six domains. For backward
2773 compatibility, applications that directly modify the ‘_res’ global
2774 object are still limited to six search domains.
2776 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
2777 Library will now randomly pick a name server from the configuration as a
2778 starting point. (Previously, the second name server was always used.)
2780 * The tunables feature is now enabled by default. This allows users to tweak
2781 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
2783 * New function reallocarray, which resizes an allocated block (like realloc)
2784 to the product of two sizes, with a guaranteed clean failure upon integer
2785 overflow in the multiplication. Originally from OpenBSD, contributed by
2786 Dennis Wölfing and Rüdiger Sonderfeld.
2788 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
2789 These are extended versions of preadv and pwritev, respectively, taking an
2790 additional flags argument. The set of supported flags depends on the
2791 running kernel; full support currently requires kernel 4.7 or later.
2793 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
2794 create a new session ID for the spawned process. This feature is
2795 scheduled to be added to the next major revision of POSIX; for the time
2796 being, it is available under _GNU_SOURCE.
2798 * errno.h is now safe to use from C-preprocessed assembly language on all
2799 supported operating systems. In this context, it will only define the
2800 Exxxx constants, as preprocessor macros expanding to integer literals.
2802 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
2803 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
2804 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
2805 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
2807 To compile programs that use this feature, the compiler must support
2808 128-bit floating point with the type name _Float128 (as defined by TS
2809 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
2810 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
2811 must be defined to make the new interfaces visible.
2813 The new functions and macros correspond to those present for other
2814 floating-point types (except for a few obsolescent interfaces not
2815 supported for the new type), with F128 or f128 suffixes; for example,
2816 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
2817 printf or scanf formats for the new type; the strfromf128 and strtof128
2818 interfaces should be used instead.
2820 Deprecated and removed features, and other changes affecting compatibility:
2822 * The synchronization that pthread_spin_unlock performs has been changed to
2823 now be equivalent to a C11 atomic store with release memory order to the
2824 spin lock's memory location. Previously, several (but not all)
2825 architectures used stronger synchronization (e.g., containing what is
2826 often called a full barrier). This change can improve performance, but
2827 may affect odd fringe uses of spin locks that depend on the previous
2828 behavior (e.g., using spin locks as atomic variables to try to implement
2829 Dekker's mutual exclusion algorithm).
2831 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
2834 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
2835 will only be built and installed when the GNU C Library is configured with
2836 --enable-obsolete-rpc. This allows alternative RPC implementations, such
2837 as TIRPC or rpcsvc-proto, to be used.
2839 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
2840 libnss_compat, are deprecated, and will not be built or installed by
2843 The NIS(+) support library, libnsl, is also deprecated. By default, a
2844 compatibility shared library will be built and installed, but not headers
2845 or development libraries. Only a few NIS-related programs require this
2846 library. (In particular, the GNU C Library has never required programs
2847 that use 'gethostbyname' to be linked with libnsl.)
2849 Replacement implementations based on TIRPC, which additionally support
2850 IPv6, are available from <https://github.com/thkukuk/>. The configure
2851 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
2852 name service modules, to be built and installed.
2854 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
2855 support is enabled, the configured recursive resolver must support EDNS.
2856 (Responding to EDNS-enabled queries with responses which are not
2857 EDNS-enabled is fine, but FORMERR responses are not.)
2859 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
2860 servers have not supported this opcode for a long time.
2862 * The _res_opcodes variable has been removed from libresolv. It had been
2863 exported by accident.
2865 * <string.h> no longer includes inline versions of any string functions,
2866 as this kind of optimization is better done by the compiler. The macros
2867 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
2869 * The nonstandard header <xlocale.h> has been removed. Most programs should
2870 use <locale.h> instead. If you have a specific need for the definition of
2871 locale_t with no other declarations, please contact
2872 libc-alpha@sourceware.org and explain.
2874 * The obsolete header <sys/ultrasound.h> has been removed.
2876 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
2878 * The obsolete function cfree has been removed. Applications should use
2881 * The stack_t type no longer has the name struct sigaltstack. This changes
2882 the C++ name mangling for interfaces involving this type.
2884 * The ucontext_t type no longer has the name struct ucontext. This changes
2885 the C++ name mangling for interfaces involving this type.
2887 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
2888 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
2889 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
2890 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
2891 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
2892 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
2893 fpregset_t type no longer has the name struct fpu. This changes the C++
2894 name mangling for interfaces involving those types.
2896 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
2897 synced with the kernel:
2899 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
2900 are not supported on this architecture and have been removed.
2902 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
2903 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
2904 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
2906 Programs that assume the GET/SETREGS ptrace requests are universally
2907 available will now fail to build, instead of malfunctioning at runtime.
2909 Changes to build and runtime requirements:
2911 * Linux kernel 3.2 or later is required at runtime, on all architectures
2912 supported by that kernel. (This is a change from version 2.25 only for
2915 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
2917 * On most architectures, GCC 4.9 or later is required to build the GNU C
2918 Library. On powerpc64le, GCC 6.2 or later is required.
2920 Older GCC versions and non-GNU compilers are still supported when
2921 compiling programs that use the GNU C Library. (We do not know exactly
2922 how old, and some GNU extensions to C may be _de facto_ required. If you
2923 are interested in helping us make this statement less vague, please
2924 contact libc-alpha@sourceware.org.)
2926 Security related changes:
2928 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
2929 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
2931 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
2932 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
2934 * Avoid printing a backtrace from the __stack_chk_fail function since it is
2935 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
2938 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
2939 fixed (CVE-2017-12133).
2941 The following bugs are resolved with this release:
2943 [984] network: Respond to changed resolv.conf in gethostbyname
2944 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
2945 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
2947 [12189] libc: __stack_chk_fail should not attempt a backtrace
2949 [14096] time: Race condition on timezone/tst-timezone.out
2950 [14172] localedata: az_IR: new locale
2951 [14995] build: glibc fails to build if gold is the default linker, even if
2953 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
2954 [16637] network: inet_pton function is accepting IPv6 with bad format
2955 [16640] string: string/strtok.c: undefined behaviour inconsistent between
2956 x86 and other generic code
2957 [16875] localedata: ko_KR: fix lang_name
2958 [17225] localedata: ar_SY: localized month names for May and June are
2960 [17297] localedata: da_DK: wrong date_fmt string
2961 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
2962 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
2963 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
2964 [19066] localedata: ar_SA abbreviated day and month names are in English
2965 [19569] network: resolv: Support an arbitrary number of search domains
2966 [19570] network: Implement random DNS server selection in the stub
2968 [19838] locale: localedef fails on PA-RISC
2969 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
2970 order of 0D36 and 0D37
2971 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
2973 [20098] libc: FAIL: debug/backtrace-tst on hppa
2974 [20257] network: sunrpc: clntudp_call does not enforce timeout when
2976 [20275] localedata: locale day/abday/mon/abmon should not have trailing
2978 [20313] localedata: Update locale data to Unicode 9.0
2979 [20424] manual: Document how to provide a malloc replacement
2980 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
2982 [20686] locale: Add el_GR@euro to SUPPORTED.
2983 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
2984 failures consistently
2985 [21015] dynamic-link: Document and fix --enable-bind-now
2986 [21016] nptl: pthread_cond support is broken on hppa
2987 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
2988 frame-pointer on i386
2989 [21049] libc: segfault in longjmp_chk() due to clobbered processor
2991 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
2992 [21088] libc: Build fails with --enable-static-nss
2993 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
2994 generic c code is used
2995 [21109] libc: Tunables broken on big-endian
2996 [21112] math: powf has large ulp errors with base close to 1 and exponent
2998 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3000 [21120] malloc: glibc malloc is incompatible with GCC 7
3001 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3003 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3004 (-0.0) when linking with -lieee
3005 [21171] math: log10, log2 and lgamma return incorrect results
3006 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3007 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3008 [21207] localedata: ce_RU: update weekdays from CLDR
3009 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3010 [21217] localedata: Update months from CLDR-31
3011 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3012 [21243] libc: support_delete_temp_file should issue warning for failed
3014 [21244] libc: support resolv_test_start() socket fd close should be
3016 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3017 new posix_spawn implementation
3018 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3019 leads to lower CPU frequency
3020 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3021 [21261] libc: [sparc64] bits/setjmp.h namespace
3022 [21267] network: [mips] bits/socket.h IOC* namespace
3023 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3024 [21270] libc: mmap64 silently truncates large offset values
3025 [21275] libc: posix_spawn always crashes on ia64 now
3026 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3027 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3028 [21289] libc: Incorrect declaration for 32-bit platforms with
3029 _FILE_OFFSET_BITS=64 causes build error
3030 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3031 not support gethostbyname4_r
3032 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3034 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3036 [21340] libc: Support POSIX_SPAWN_SETSID
3037 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3038 [21359] network: ns_name_pack needs additional byte in destination buffer
3039 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3040 against fragmentation attacks (CVE-2017-12132)
3041 [21369] network: resolv: Remove EDNS fallback
3042 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3044 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3045 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3046 [21393] stdio: Missing dup3 error check in freopen, freopen64
3047 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3048 [21399] localedata: Bad description for U00EC in
3049 localedata/charmaps/CP1254
3050 [21411] malloc: realloc documentation error
3051 [21426] network: sys/socket.h uio.h namespace
3052 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3053 [21445] libc: signal.h bsd_signal namespace
3054 [21455] network: Network headers stdint.h namespace
3055 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3057 [21475] network: resolv: Overlong search path is truncated mid-label
3058 [21511] libc: sigstack namespace
3059 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3060 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3061 bits/syscall.h: No such file or directory
3062 [21517] libc: struct sigaltstack namespace
3063 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3064 [21533] localedata: Update locale data to Unicode 10.0
3066 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3067 junk at end of line, first unrecognized character is `@'
3068 [21538] libc: SIG_HOLD missing for XPG4
3069 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3070 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3071 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3072 [21543] libc: sigevent namespace
3073 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3074 size for general purpose registers in mcontext_t structure
3075 [21550] libc: sigwait namespace
3076 [21552] libc: XPG4 bsd_signal namespace
3077 [21554] libc: sigpause namespace
3078 [21560] libc: sys/wait.h signal.h namespace
3079 [21561] libc: waitid namespace
3080 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3081 '/usr/include/stdlib.h': Permission denied
3082 [21575] libc: sys/wait.h missing struct rusage definition
3083 [21584] libc: sigaltstack etc namespace
3084 [21597] libc: siginterrupt namespace
3085 [21607] math: hppa: FAIL: math/test-tgmath
3086 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3088 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3089 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3090 stack and heap (CVE-2017-1000366)
3091 [21625] libc: wait3 namespace
3092 [21654] nss: Incorrect pointer alignment in NSS group merge result
3094 [21657] network: Parse interface zone id for node-local multicast
3095 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3097 [21666] libc: .symver is used on common symbol
3098 [21668] network: resolv: res_init cross-thread broadcast introduces race
3100 [21687] math: tgmath.h totalorder, totalordermag return type
3101 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3103 [21696] libc: Incorrect assumption of of __cpu_mask in
3104 posix/sched_cpucount.c
3105 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3106 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3108 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3109 leading to relocation crash
3110 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3111 `resolv_conf_matches (resp, conf)' failed.
3112 [21710] localedata: Added Samoan language locale for Samoa
3113 [21711] localedata: Pashto yesstr/nostr locale are missing
3114 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3115 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3116 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3117 [21723] localedata: yesstr/nostr missing for Chinese language locale
3118 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3120 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3122 [21728] localedata: New Locale for Tongan language
3123 [21729] localedata: incorrect LC_NAME fields for hi_IN
3124 [21733] localedata: yesstr and nostr are missing for zh_HK
3125 [21734] localedata: Missing yesstr and nostr are for kw_GB
3126 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3127 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3128 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3129 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3131 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3133 [21749] localedata: Wrong abbreviated day name (“abday”) for
3135 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3136 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3137 [21759] localedata: missing yesstr and nostr for Tigrinya
3138 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3139 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3140 [21767] localedata: Missing Bislama locales
3141 [21768] localedata: Missing yesstr and nostr for aa_ET
3142 [21770] localedata: Missing Field in li_NL
3143 [21778] nptl: Robust mutex may deadlock
3144 [21779] libc: MicroBlaze segfaults when loading libpthread
3145 [21783] localedata: Fix int_select international_call_prefixes
3146 [21784] localedata: Inconsistency in country_isbn
3147 [21788] localedata: Missing Country Postal Abbreviations
3148 [21794] localedata: Added-country_isbn-for-Italy
3149 [21795] localedata: Add/Fix country_isbn for France
3150 [21796] localedata: Added country_isbn for Republic of Korea
3151 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3152 [21799] localedata: Added int_select international_call_prefixes
3153 [21801] localedata: Added int_select international_call_prefixes
3154 [21804] nptl: Double semicolon in thread-shared-types.h
3155 [21807] localedata: LC_ADDRESS fix for pap_CW
3156 [21808] localedata: Fix LC_ADDRESS for pap_AW
3157 [21821] localedata: Added country_name in mai_IN
3158 [21822] localedata: Fix LC_TIME for mai_IN
3159 [21823] localedata: missing yesstr, nostr for sa_IN
3160 [21825] localedata: Fix name_mrs for mag_IN
3161 [21828] localedata: 2.26 changelog should mention user visible changes
3163 [21835] localedata: Added Maithili language locale for Nepal
3164 [21838] localedata: Removed redundant data for the_NP
3165 [21839] localedata: Fix LC_MONETARY for ta_LK
3166 [21844] localedata: Fix Latin characters and Months Sequence.
3167 [21848] localedata: Fix mai_NP Title Name
3172 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3173 24731-2:2010, is supported to enable declarations of functions from that
3174 TR. Note that not all functions from that TR are supported by the GNU C
3177 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3178 18661-1:2014, is supported to enable declarations of functions and macros
3179 from that TS. Note that not all features from that TS are supported by
3182 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3183 18661-4:2015, is supported to enable declarations of functions and macros
3184 from that TS. Note that most features from that TS are not supported by
3187 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3188 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3189 Since the GNU C Library defaults to a much newer revision of POSIX, this
3190 will only affect programs that specifically request an old conformance
3191 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3192 see a change in the visible declarations, but a program compiled with
3193 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3196 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3197 defined by all multithreaded code, but glibc has not required this for
3200 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3201 means that in a future release, the macros “major”, “minor”, and “makedev”
3202 will only be available from <sys/sysmacros.h>.
3204 These macros are not part of POSIX nor XSI, and their names frequently
3205 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3206 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3207 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3210 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3211 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3212 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3214 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3215 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3216 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3217 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3218 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3219 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3220 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3221 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3222 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3223 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3224 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3227 * New <math.h> features are added from TS 18661-1:2014:
3229 - Signaling NaN macros: SNANF, SNAN, SNANL.
3231 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3232 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3233 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3235 - llogb functions: the llogb, llogbf and llogbl functions, and the
3236 FP_LLOGB0 and FP_LLOGBNAN macros.
3238 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3241 - Comparison macros: iseqsig.
3243 - Classification macros: iscanonical, issubnormal, iszero.
3245 - Total order functions: totalorder, totalorderf, totalorderl,
3246 totalordermag, totalordermagf, totalordermagl.
3248 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3250 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3251 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3253 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3254 are added to libc. They convert a floating-point number into string.
3256 * Most of glibc can now be built with the stack smashing protector enabled.
3257 It is recommended to build glibc with --enable-stack-protector=strong.
3258 Implemented by Nick Alcock (Oracle).
3260 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3261 intended to be used instead of memset() to erase sensitive data after use;
3262 the compiler will not optimize out calls to explicit_bzero even if they
3263 are "unnecessary" (in the sense that no _correct_ program can observe the
3264 effects of the memory clear).
3266 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3267 to float instead of double. This does not affect the ABI of any libraries
3268 that are part of the GNU C Library, but may affect the ABI of other
3269 libraries that use this type in their interfaces.
3271 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3272 float_t and double_t types are now defined to long double instead of float
3273 and double. These options are not the default, and this does not affect
3274 the ABI of any libraries that are part of the GNU C Library, but it may
3275 affect the ABI of other libraries that use this type in their interfaces,
3276 if they are compiled or used with those options.
3278 * The getentropy and getrandom functions, and the <sys/random.h> header file
3281 * The buffer size for byte-oriented stdio streams is now limited to 8192
3282 bytes by default. Previously, on Linux, the default buffer size on most
3283 file systems was 4096 bytes (and thus remains unchanged), except on
3284 network file systems, where the buffer size was unpredictable and could be
3285 as large as several megabytes.
3287 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3288 for the Linux quota interface which predates kernel version 2.4.22 has
3291 * The malloc_get_state and malloc_set_state functions have been removed.
3292 Already-existing binaries that dynamically link to these functions will
3293 get a hidden implementation in which malloc_get_state is a stub. As far
3294 as we know, these functions are used only by GNU Emacs and this change
3295 will not adversely affect already-built Emacs executables. Any undumped
3296 Emacs executables, which normally exist only during an Emacs build, should
3297 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3299 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3300 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3301 “no-ip6-dotint” had already been the default, and support for the
3302 “ip6-dotint” option was removed from the Internet in 2006.
3304 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3305 flag from <resolv.h> have been removed. The option relied on a
3306 backwards-incompatible DNS extension which was never deployed on the
3309 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3310 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3311 They were already unimplemented.
3313 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3314 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3315 removed again from the IETF name lookup interface specification in RFC
3316 2553. Applications should use getaddrinfo instead.
3318 * DNSSEC-related declarations and definitions have been removed from the
3319 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3320 decode the data part of DNSSEC record types. Previous versions of glibc
3321 only implemented minimal support for the previous version of DNSSEC, which
3322 is incompatible with the currently deployed version.
3324 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3325 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3326 <arpa/nameser.h> header file because the distinction between RR types and
3327 meta-RR types is not officially standardized, subject to revision, and
3328 thus not suitable for encoding in a macro.
3330 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3331 and rhook members of the res_state type in <resolv.h> have been removed.
3332 The glibc stub resolver did not support these hooks, but the header file
3333 did not reflect that.
3335 * For multi-arch support it is recommended to use a GCC which has
3336 been built with support for GNU indirect functions. This ensures
3337 that correct debugging information is generated for functions
3338 selected by IFUNC resolvers. This support can either be enabled by
3339 configuring GCC with '--enable-gnu-indirect-function', or by
3340 enabling it by default by setting 'default_gnu_indirect_function'
3341 variable for a particular architecture in the GCC source file
3344 * GDB pretty printers have been added for mutex and condition variable
3345 structures in POSIX Threads. When installed and loaded in gdb these pretty
3346 printers show various pthread variables in human-readable form when read
3347 using the 'print' or 'display' commands in gdb.
3349 * Tunables feature added to allow tweaking of the runtime for an application
3350 program. This feature can be enabled with the '--enable-tunables' configure
3351 flag. The GNU C Library manual has details on usage and README.tunables has
3352 instructions on adding new tunables to the library.
3354 * A new version of condition variables functions have been implemented in
3355 the NPTL implementation of POSIX Threads to provide stronger ordering
3358 * A new version of pthread_rwlock functions have been implemented to use a more
3359 scalable algorithm primarily through not using a critical section anymore to
3362 Security related changes:
3364 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3365 have been created with makecontext could fail to terminate due to a
3366 missing .cantunwind annotation. This has been observed to lead to a hang
3367 (denial of service) in some Go applications compiled with gccgo. Reported
3368 by Andreas Schwab. (CVE-2016-6323)
3370 * The DNS stub resolver functions would crash due to a NULL pointer
3371 dereference when processing a query with a valid DNS question type which
3372 was used internally in the implementation. The stub resolver now uses a
3373 question type which is outside the range of valid question type values.
3376 The following bugs are resolved with this release:
3378 [4099] stdio: Overly aggressive caching by stream i/o functions.
3379 [7065] build: Support building glibc with -fstack-protector or -fstack-
3381 [9842] localedata: en_CA: incorrect date format
3382 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3383 before it started waiting
3384 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3385 [15765] nptl: sem_open is wrongly a cancellation point
3386 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3387 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3389 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3390 library linked with pthread
3391 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3392 "FIXME: Ingo" issue)
3393 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3394 [17252] libc: getrandom and getentropy syscall
3395 [17730] malloc: thread-local storage is sometimes improperly free()'d
3396 after being __libc_memalign()'d
3397 [18241] stdio: failed fseek on memstream does not set errno and can fail
3399 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3401 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3402 PTHREAD_PRIO_INHERIT mutex on ARM
3403 [18784] network: res_query and related function crash for special record
3404 type queries (CVE-2015-5180)
3405 [19380] math: strtod does not raise "inexact"
3406 [19387] string: Integer overflow in memchr
3407 [19390] string: Integer overflow in strncat
3408 [19398] build: linknamespace tests fail with massively parallel build
3409 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3411 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3412 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3413 [19514] libc: [PATCH] Fix spelling errors in spelling
3414 "implement"/"implementation" in several places
3415 [19582] network: Deprecate RES_USE_INET6
3416 [19673] manual: clog10 docs appear to be erroneous
3417 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3418 causes a segmentation fault
3419 [19826] libc: invalid pointer returned from __tls_get_addr with static
3421 [20016] network: resolv: Remove hooks support from the API
3422 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3424 [20033] math: [x86_64] vectorized math function don't call the __finite
3426 [20116] nptl: use after free in pthread_create
3427 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3428 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3430 [20311] nptl: please install proc_service.h
3431 [20366] libc: Compilation errors in installed headers in strict-compliance
3433 [20370] malloc: malloc: Arena free list management is still racy
3434 (incorrect fix in bug 19243)
3435 [20386] libc: assert (X = 0) does not result in GCC warning
3436 [20432] malloc: malloc: Minimize interface required for interposition
3437 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3438 in _Unwind_Backtrace (CVE-2016-6323)
3439 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3440 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3442 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3443 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3444 [20477] network: resolv: incorrect double-checked locking related to
3446 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3448 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3450 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3451 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3452 cause transition penalty
3453 [20517] math: sparcv9 missing fdiml compat symbol
3454 [20524] manual: strverscmp is inconsistent
3455 [20525] libc: <sys/quota.h> should be based on kernel headers
3456 [20539] math: GCC 7 -static -lm fails to link at -O3
3457 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3459 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3461 [20591] network: Remove obsolete DNSSEC support
3462 [20592] network: DNS resource record type classification macros in
3463 <arpa/nameser.h> are incorrect
3464 [20593] network: Update DNS RR type definitions
3465 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3466 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3468 [20629] network: libresolv: Remove support for bitstring labels
3470 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3471 assertion: "maxidx >= 2"
3472 [20660] math: [arm] Use VSQRT
3473 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3474 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3475 [20689] libc: Test for FMA should also check for AVX.
3476 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3477 [20715] math: iszero macro breaks existing code
3478 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3479 [20728] libc: powerpc: Missing TOC stub in clone
3480 [20729] build: glibc-2.24 fails to build for i486 with -Os
3481 [20750] build: Build fails with default PIE enabled gcc-6.x
3482 [20768] math: [alpha] sqrt fegetenv namespace
3483 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3485 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3486 __FLT_EVAL_METHOD__ is 2
3487 [20790] network: rpcgen buffer overrun in get_prog_declaration
3488 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3489 [20829] libc: crypt snprintf namespace
3490 [20847] libc: tst-vfork3 failure
3491 [20855] math: Default bits/mathdef.h has inappropriate float_t
3492 [20859] math: [sh4] FP_ILOGB0 invalid
3493 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3494 U+20AC), not same as GBK
3495 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3496 [20916] math: pow handling of sNaN arguments
3497 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3498 [20919] math: Bad pow (qNaN, 0) result with -lieee
3499 [20940] math: hypot sNaN handling
3500 [20947] math: fmax, fmin sNaN handling
3501 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3502 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3504 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3505 [20973] nptl: robust mutexes: Lost wake-ups
3506 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3507 [20978] nis: strlen on null pointer in nss_nisplus
3508 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3510 [21014] string: i686 memchr overflows internal pointer check
3511 [21019] libc: [mips] n32 lseek incorrect on overflow
3512 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3513 [21026] libc: [MIPS] readahead syscall is broken on n64
3514 [21028] math: Fallback fesetexceptflag should always succeed
3515 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3516 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3518 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3519 [21061] librt: [microblaze] librt lost clock_* exports
3520 [21073] libc: tunables: insecure environment variables passed to
3521 subprocesses with AT_SECURE
3522 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3526 * The minimum Linux kernel version that this version of the GNU C Library
3527 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3528 kernel version 2.6.32 or later suffices (on architectures that already
3529 required kernel versions more recent than 3.2, those requirements remain
3530 unchanged). Linux 3.2 or later kernel headers are required on all
3533 * The pap_AN locale has been deleted. This has been deprecated for a long
3534 time. It has been replaced by pap_AW & pap_CW, both of which have long
3535 been included in previous releases.
3537 * The readdir_r and readdir64_r functions have been deprecated. It is
3538 recommended to use readdir and readdir64 instead.
3540 * The type “union wait” has been removed. It was deprecated in the early
3541 1990s and never part of POSIX. Application code should use the int type
3542 instead of “union wait”.
3544 * A new NSS action is added to facilitate large distributed system
3545 administration. The action, MERGE, allows remote user stores like LDAP
3546 to be merged into local user stores like /etc/groups in order to provide
3547 easy to use, updated, and managed sets of merged credentials. The new
3548 action can be used by configuring it in /etc/nsswitch.conf:
3549 group: files [SUCCESS=merge] nis
3550 Implemented by Stephen Gallagher (Red Hat).
3552 * The deprecated __malloc_initialize_hook variable has been removed from the
3555 * The long unused localedef --old-style option has been removed. It hasn't
3556 done anything in over 16 years. Scripts using this option can safely
3559 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3560 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3561 return the next representable value in the direction of positive infinity
3562 and the nextdown functions return the next representable value in the
3563 direction of negative infinity. These are currently enabled as GNU
3566 Security related changes:
3568 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3569 could result in a stack overflow when getnetbyname was called with an
3570 overly long name. (CVE-2016-3075)
3572 * Previously, getaddrinfo copied large amounts of address data to the stack,
3573 even after the fix for CVE-2013-4458 has been applied, potentially
3574 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3575 instead. Reported by Michael Petlan. (CVE-2016-3706)
3577 * The glob function suffered from a stack-based buffer overflow when it was
3578 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3579 Reported by Alexander Cherepanov. (CVE-2016-1234)
3581 * The Sun RPC UDP client could exhaust all available stack space when
3582 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3583 alloca plugin for GCC. (CVE-2016-4429)
3585 * The IPv6 name server management code in libresolv could result in a memory
3586 leak for each thread which is created, performs a failing naming lookup,
3587 and exits. Over time, this could result in a denial of service due to
3588 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3590 The following bugs are resolved with this release:
3592 [1170] localedata: ne_NP: update Nepali locale definition file
3593 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3595 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3596 [6796] math: fdim() does not set errno on overflow
3597 [10354] libc: posix_spawn should use vfork() in more cases than presently
3598 [11213] localedata: localedata: add copyright disclaimer to locale files
3599 [12143] localedata: chr_US: new Cherokee locale
3600 [12450] localedata: sgs_LT: new locale
3601 [12676] localedata: ln_CD: new locale
3602 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3604 [13304] math: fma, fmaf, fmal produce wrong results
3605 [14259] build: --localedir arg to configure is ignored
3606 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3607 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3608 [14934] localedata: es_CL: wrong first weekday chilean locale
3609 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3611 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
3613 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
3614 [15368] nptl: raise() is not async-signal-safe
3615 [15479] math: ceil, floor, round and trunc raise inexact exception
3616 [15578] localedata: kk_KZ: various updates
3617 [16003] localedata: pap_AN: punt old locale
3618 [16137] localedata: iw_IL: punt old locale
3619 [16190] localedata: eo: new esperanto locale
3620 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
3621 [16742] malloc: race condition: pthread_atfork() called before first
3622 malloc() results in unexpected locking behaviour/deadlocks
3623 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
3625 [16983] localedata: postal_fmt does not allow %l and %n modifiers
3626 [17565] localedata: pt_PT: wrong (work-)week start
3627 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
3628 [17950] build: Build fails with -msse
3629 [18205] localedata: be_BY*: wrong first_weekday and first_workday
3630 [18433] libc: posix_spawn does not return correctly upon failure to
3632 [18453] localedata: charmaps/IBM875: incorrect codes
3633 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
3635 [18896] localedata: he_IL: improvements for currency
3636 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
3637 Romanian locale data
3638 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
3640 [19056] libc: Deprecate readdir_r
3641 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
3643 [19198] localedata: nl_NL: small improvements for Dutch locales
3644 [19257] network: Per-thread memory leak in __res_vinit with IPv6
3645 nameservers (CVE-2016-5417)
3646 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
3648 [19400] locale: Language missing in "iso-639.def", trivial fix in
3650 [19431] malloc: Deadlock between fflush, getdelim, and fork
3651 [19505] libc: Incorrect file descriptor validity checks in
3652 posix_spawn_file_actions_add{open,close,dup2}
3653 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
3654 when using RTLD_NEXT
3655 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
3656 `intl/{gettextP,loadinfo}.h'
3657 [19534] libc: execle, execlp may use malloc
3658 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
3659 [19573] network: res_nclose and __res_maybe_init disagree about name
3660 server initialization, breaking Hesiod
3661 [19575] localedata: Status of GB18030 tables
3662 [19581] localedata: sr_* date_fmt string contains additional newline
3663 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
3665 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
3666 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
3667 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
3668 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
3670 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
3672 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
3674 [19610] dynamic-link: ldconfig -X removes stale symbolic links
3675 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
3676 [19633] locale: strfmon_l applies global locale to number formatting
3677 [19642] network: Memory leak in getnameinfo
3678 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
3679 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
3681 [19654] math: [x86_64] Need testcase for BZ #19590 fix
3682 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
3684 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
3685 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
3687 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
3689 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
3691 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
3692 pointers and lengths in error-case.
3693 [19727] locale: Converting from/to UTF-xx with iconv() does not always
3694 report errors on UTF-16 surrogates values.
3695 [19755] nscd: nscd assertion failure in gc
3696 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
3697 [19759] libc: mempcpy shouldn't be inlined
3698 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
3699 [19765] libc: s390 needs an optimized mempcpy
3700 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
3701 NAME_MAX limit assumption (CVE-2016-1234)
3702 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
3703 [19787] network: Missing and incorrect truncation checks in getnameinfo
3704 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
3706 [19791] network: Assertion failure in res_query.c with un-connectable name
3708 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
3709 [19822] math: libm.so install clobbers old version
3710 [19825] network: resolv: send_vc can return uninitialized data in second
3711 response to getaddrinfo
3712 [19830] network: nss_dns: should check RDATA length against buffer length
3713 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
3714 confronted with A/AAAA records of invalid size
3715 [19837] nss: nss_db: No retries for some long lines with a larger buffer
3716 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
3717 [19853] stdio: Printing IBM long double in decimal with high precision is
3719 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
3720 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
3721 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
3723 [19865] network: Assertion failure or memory leak in
3724 _nss_dns_getcanonname_r
3725 [19868] network: nss_dns: netent code does not skip over non-PTR records
3726 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
3728 [19881] string: Improve x86-64 memset
3729 [19907] string: Incorrect memcpy tests
3730 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
3732 [19925] libc: termios.h XCASE namespace
3733 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
3734 [19929] libc: limits.h NL_NMAX namespace
3735 [19931] stdio: Memory leak in vfprintf
3736 [19957] libc: clone(CLONE_VM) access invalid parent memory
3737 [19963] localedata: en_IL: New locale
3738 [19989] stdio: stdio.h cuserid namespace
3739 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
3741 [19996] locale: langinfo.h nl_langinfo_l namespace
3742 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
3743 [20010] network: getaddrinfo: Stack overflow in hostent translation
3745 [20012] stdio: libio: fmemopen append mode failure
3746 [20014] stdio: stdio.h namespace for pre-threads POSIX
3747 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
3748 [20023] libc: fcntl.h timespec namespace
3749 [20024] math: [x86_64] vectorized sincos trashes the stack
3750 [20031] network: nss_hesiod: Heap overflow in get_txt_records
3751 [20041] time: sys/time.h timespec namespace
3752 [20043] libc: unistd.h missing cuserid for UNIX98 and before
3753 [20044] libc: unistd.h missing pthread_atfork for UNIX98
3754 [20051] libc: ttyslot in wrong header under wrong conditions
3755 [20054] libc: gethostname not declared for XPG4
3756 [20055] libc: termios.h missing tcgetsid for XPG4
3757 [20072] dynamic-link: x86 init_cpu_features is called twice in static
3759 [20073] libc: sys/stat.h fchmod namespace
3760 [20074] libc: stdlib.h rand_r namespace
3761 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
3762 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
3764 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
3765 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
3767 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
3768 [20119] libc: Wrong mask for processors level type from CPUID
3769 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
3770 AS not supporting AVX512
3771 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
3773 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
3774 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
3776 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
3777 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
3778 [20178] libc: posix_spawn{p} should not call exit
3779 [20191] stdio: libio: vtables hardening
3780 [20195] string: FMA4 detection requires CPUID execution with register
3782 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
3783 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
3785 [20212] math: acos (sNaN) returns sNaN
3786 [20213] math: asin (sNaN) returns sNaN
3787 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
3788 [20218] math: [i386] asinhl (sNaN) returns sNaN
3789 [20219] math: [i386] atanhl (sNaN) returns sNaN
3790 [20222] stdio: fopencookie: Mangle function pointers
3791 [20224] math: [i386] cbrtl (sNaN) returns sNaN
3792 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
3793 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
3795 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
3796 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
3797 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
3798 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
3799 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
3800 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
3801 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
3802 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
3803 [20240] math: modf (sNaN) returns sNaN
3804 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
3805 [20250] math: frexp (sNaN) returns sNaN
3806 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
3807 [20255] math: [i386] fdim, fdimf return with excess range and precision /
3809 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
3810 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
3811 subscript is below array bounds [-Werror=array-bounds]
3812 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
3813 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
3815 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
3816 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
3818 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
3819 "invalid" exceptions
3820 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
3821 [20316] localedata: id_ID: Februari instead of Pebruari
3822 [20327] string: POWER8 strcasecmp returns incorrect result
3823 [20347] math: Failure: Test: j0_downward (0xap+0)
3824 [20348] libc: FAIL: misc/tst-preadvwritev64
3825 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
3826 [20350] libc: There is no test for p{read,write}64
3827 [20357] math: Incorrect cos result for 1.5174239687223976
3828 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
3832 * Unicode 8.0.0 Support: Character encoding, character type info, and
3833 transliteration tables are all updated to Unicode 8.0.0, using new
3834 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
3835 These updates cause user visible changes, such as the fixes for bugs
3836 89, 16061, and 18568.
3838 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
3839 kernel-internal CPU set size. This means that requests that change the
3840 CPU affinity which failed before (for example, an all-ones CPU mask) will
3841 now succeed. Applications that need to determine the effective CPU
3842 affinities need to call sched_getaffinity or pthread_getaffinity_np after
3843 setting it because the kernel can adjust it (and the previous size check
3844 would not detect this in the majority of cases).
3846 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
3847 the following new symbols are used: fts64_children, fts64_close,
3848 fts64_open, fts64_read and fts64_set.
3850 * getaddrinfo now detects certain invalid responses on an internal netlink
3851 socket. If such responses are received, an affected process will
3852 terminate with an error message of "Unexpected error <number> on netlink
3853 descriptor <number>" or "Unexpected netlink response of size <number> on
3854 descriptor <number>". The most likely cause for these errors is a
3855 multi-threaded application which erroneously closes and reuses the netlink
3856 file descriptor while it is used by getaddrinfo.
3858 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
3859 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
3860 unnecessary serialization of memory allocation requests across threads.
3861 The defect is now corrected. Users should see a substantial increase in
3862 the concurent throughput of allocation requests for applications which
3863 trigger this bug. Affected applications typically create and
3864 destroy threads frequently. (Bug 19048 was reported and analyzed by
3867 * There is now a --disable-timezone-tools configure option for disabling the
3868 building and installing of the timezone related utilities (zic, zdump, and
3869 tzselect). This is useful for people who build the timezone data and code
3870 independent of the GNU C Library.
3872 * The obsolete header <regexp.h> has been removed. Programs that require
3873 this header must be updated to use <regex.h> instead.
3875 * The obsolete functions bdflush, create_module, get_kernel_syms,
3876 query_module and uselib are no longer available to newly linked binaries;
3877 the header <sys/kdaemon.h> has been removed. These functions and header
3878 were specific to systems using the Linux kernel and could not usefully be
3879 used with the GNU C Library on systems with version 2.6 or later of the
3882 * Optimized string, wcsmbs and memory functions for IBM z13.
3883 Implemented by Stefan Liebler.
3885 * Newly linked programs that define a variable called signgam will no longer
3886 have it set by the lgamma, lgammaf and lgammal functions. Programs that
3887 require signgam to be set by those functions must ensure that they use the
3888 variable provided by the GNU C Library and declared in <math.h>, without
3889 defining their own copy.
3891 * The minimum GCC version that can be used to build this version of the GNU
3892 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
3893 still be used to compile programs using the GNU C Library.
3895 Security related changes:
3897 * An out-of-bounds value in a broken-out struct tm argument to strftime no
3898 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
3900 * The LD_POINTER_GUARD environment variable can no longer be used to disable
3901 the pointer guard feature. It is always enabled. Previously,
3902 LD_POINTER_GUARD could be used to disable security hardening in binaries
3903 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
3906 * An integer overflow in hcreate and hcreate_r could lead to an
3907 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
3909 * The catopen function no longer has unbounded stack usage. Reported by
3910 Max. (CVE-2015-8779)
3912 * The nan, nanf and nanl functions no longer have unbounded stack usage
3913 depending on the length of the string passed as an argument to the
3914 functions. Reported by Joseph Myers. (CVE-2014-9761)
3916 * A stack-based buffer overflow was found in libresolv when invoked from
3917 libnss_dns, allowing specially crafted DNS responses to seize control
3918 of execution flow in the DNS client. The buffer overflow occurs in
3919 the functions send_dg (send datagram) and send_vc (send TCP) for the
3920 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
3921 family. The use of AF_UNSPEC triggers the low-level resolver code to
3922 send out two parallel queries for A and AAAA. A mismanagement of the
3923 buffers used for those queries could result in the response of a query
3924 writing beyond the alloca allocated buffer created by
3925 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
3926 the overflow. Thanks to the Google Security Team and Red Hat for
3927 reporting the security impact of this issue, and Robert Holiday of
3928 Ciena for reporting the related bug 18665. (CVE-2015-7547)
3930 The following bugs are resolved with this release:
3932 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
3933 [887] math: Math library function "logb" and "nextafter" inconsistent
3934 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
3935 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
3936 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
3937 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
3939 [4404] localedata: German translation of "Alarm clock" is misleading
3940 [6799] math: nextafter() and nexttoward() doen't set errno on
3941 overflow/underflow errors
3942 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
3944 [10432] nis: _nss_nis_setnetgrent assertion failure
3945 [11460] libc: fts has no LFS support
3946 [12926] network: getaddrinfo()/make_request() may spin forever
3947 [13065] nptl: Race condition in pthread barriers
3948 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
3949 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
3951 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
3952 [14912] libc: Rename non-installed bits/*.h headers
3953 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
3954 [15367] math: Let gcc use __builtin_isinf
3955 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
3956 [15421] math: lgamma wrongly sets signgam for ISO C
3957 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
3958 FE_INVALID with argument out of range
3959 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
3961 [15786] dynamic-link: ifunc resolver functions can smash function
3963 [15918] math: Unnecessary check for equality in hypotf()
3964 [16061] localedata: Review / update transliteration data
3965 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
3967 [16141] time: strptime %z offset restriction
3968 [16171] math: drem should be alias of remainder
3969 [16296] math: fegetround is pure?
3970 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
3971 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
3973 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
3974 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
3976 [16422] math: [powerpc] math-float, math-double failing llrint tests with
3977 "Exception "Inexact" set" on ppc32
3978 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
3979 [16517] math: Missing underflow exception from tanf/tan/tanl
3980 [16519] math: Missing underflow exception from sinhf
3981 [16520] math: Missing underflow exception from tanhf
3982 [16521] math: Missing underflow exception from exp2
3983 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
3985 [16734] stdio: fopen calls mmap to allocate its buffer
3986 [16961] math: nan function incorrect handling of bad sequences
3987 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
3988 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
3989 [16985] locale: localedef: confusing error message when opening output
3991 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
3992 [17197] locale: Redundant shift character in iconv conversion output at
3994 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
3995 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
3996 [17250] dynamic-link: static linking breaks nss loading
3997 (getaddrinfo/getpwnam/etc...)
3998 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4000 [17441] math: isnan() should use __builtin_isnan() in GCC
4001 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4002 (related to lock elision)
4003 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4004 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4005 [17887] time: strptime should be able to parse "+01:00" style timezones
4006 [17905] libc: catopen() Multiple unbounded stack allocations
4008 [18084] libc: backtrace (..., 0) dumps core on x86
4009 [18086] libc: nice() sets errno to 0 on success
4010 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4011 is too large (CVE-2015-8778)
4012 [18251] dynamic-link: SONAME missing when audit modules provides path
4013 [18265] libc: add attributes for wchar string and memory functions
4014 [18370] math: csqrt missing underflows
4015 [18421] libc: [hppa] read-only segment has dynamic relocations
4016 [18472] libc: Obsolete syscall wrappers should be compat symbols
4017 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4018 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4019 [18525] localedata: Remove locale timezone information
4020 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4021 [18568] localedata: Update locale data to Unicode 8.0
4022 [18589] locale: sort-test.sh fails at random
4023 [18595] math: ctan, ctanh missing underflows
4024 [18604] libc: assert macro-expands its argument
4025 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4026 contains a vector instruction exception.
4027 [18611] math: j1, jn missing errno setting on underflow
4028 [18618] localedata: sync Chechen locale definitions with other *_RU
4030 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4031 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4032 [18665] network: In send_dg, the recvfrom function is NOT always using the
4033 buffer size of a newly created buffer (CVE-2015-7547)
4034 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4036 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4038 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4039 [18699] math: tilegx cproj() for various complex infinities does not yield
4041 [18724] libc: Harden put*ent functions against data injection
4042 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4043 [18755] build: build errors with -DNDEBUG
4044 [18757] stdio: fmemopen fails to set errno on failure
4045 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4047 [18781] libc: openat64 lacks O_LARGEFILE
4048 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4049 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4050 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4051 [18790] math: [ldbl-128ibm] tanhl inaccurate
4052 [18795] libc: stpncpy fortification misses buffer lengths that are
4053 statically too large
4054 [18796] build: build fails for --disable-mathvec
4055 [18803] math: hypot missing underflows
4056 [18820] stdio: fmemopen may leak memory on failure
4057 [18823] math: csqrt spurious underflows
4058 [18824] math: fma spurious underflows
4059 [18825] math: pow missing underflows
4060 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4061 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4062 [18870] build: sem_open.c fails to compile with missing symbol
4064 [18872] stdio: Fix memory leak in printf_positional
4065 [18873] libc: posix_fallocate overflow check ineffective
4066 [18875] math: Excess precision leads incorrect libm
4067 [18877] libc: arm: mmap offset regression
4068 [18887] libc: memory corruption when using getmntent on blank lines
4069 [18918] localedata: hu_HU: change time to HH:MM:SS format
4070 [18921] libc: Regression: extraneous stat() and fstat() performed by
4072 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4073 binaries (CVE-2015-8777)
4074 [18951] math: tgamma missing underflows
4075 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4077 [18953] localedata: lt_LT: change currency symbol to the euro
4078 [18956] math: powf inaccuracy
4079 [18961] math: [i386] exp missing underflows
4080 [18966] math: [i386] exp10 missing underflows
4081 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4082 [18969] build: multiple string test failures due to missing locale
4084 [18970] libc: Reference of pthread_setcancelstate in libc.a
4085 [18977] math: float / long double Bessel functions not in XSI POSIX
4086 [18980] math: i386 libm functions return with excess range and precision
4087 [18981] math: i386 scalb*, ldexp return with excess range and precision
4088 [18982] stdio: va_list and vprintf
4089 [18985] time: Passing out of range data to strftime() causes a segfault
4091 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4092 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4093 [19012] locale: iconv_open leaks memory on error path
4094 [19016] math: clog, clog10 inaccuracy
4095 [19018] nptl: Mangle function pointers in tls_dtor_list
4096 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4097 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4098 [19048] malloc: malloc: arena free list can become cyclic, increasing
4100 [19049] math: [powerpc] erfc incorrect zero sign
4101 [19050] math: [powerpc] log* incorrect zero sign
4102 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4103 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4104 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4105 [19074] network: Data race in _res_hconf_reorder_addrs
4106 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4107 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4108 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4110 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4112 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4113 [19086] manual: posix_fallocate64 documented argument order is wrong.
4114 [19088] math: lround, llround missing exceptions close to overflow
4116 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4117 [19095] math: dbl-64 lrint incorrect for 64-bit long
4118 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4119 [19124] dynamic-link: ld.so failed to build with older assmebler
4120 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4121 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4122 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4123 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4124 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4125 pthread_setaffinity_np
4126 [19156] math: [ldbl-128] j0l spurious underflows
4127 [19164] nptl: tst-getcpu fails with many possible CPUs
4128 [19168] math: math/test-ildoubl and math/test-ldouble failure
4129 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4130 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4132 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4133 (FE_NOMASK_ENV) do not clear SSE exceptions
4134 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4135 _int_new_arena/reused_arena
4136 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4137 [19201] math: dbl-64 remainder incorrect sign of zero result
4138 [19205] math: bits/math-finite.h conditions do not match math.h and
4140 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4141 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4142 for C99-based standards
4143 [19212] libc: features.h not -Wundef clean
4144 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4146 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4147 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4148 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4150 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4151 "inexact" exceptions
4152 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4154 [19242] libc: strtol incorrect in Turkish locales
4155 [19243] malloc: reused_arena can pick an arena on the free list, leading
4156 to an assertion failure and reference count corruption
4157 [19253] time: tzset() ineffective when temporary TZ did not include DST
4159 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4160 [19270] math: [hppa] Shared libm missing __isnanl
4161 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4162 MAP_HUGETLB and MAP_STACK defines
4163 [19313] nptl: Wrong __cpu_mask for x32
4164 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4165 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4166 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4167 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4168 [19363] time: x32: times() return value wrongly truncates/sign extends
4170 [19367] dynamic-link: Improve branch prediction on Silvermont
4171 [19369] network: Default domain name not reset by res_ninit when "search"
4172 / "domain" entry is removed from resolv.conf
4173 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4175 [19385] localedata: bg_BG: time separator should be colon, not comma
4176 [19408] libc: linux personality syscall wrapper may erroneously return an
4177 error on 32-bit architectures
4178 [19415] libc: dladdr returns wrong names on hppa
4179 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4180 IBM905, IBM907, and IBM909
4181 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4182 [19443] build: build failures with -DDEBUG
4183 [19451] build: Make check fails on test-double-vlen2
4184 [19462] libc: Glibc failed to build with -Os
4185 [19465] math: Wrong code with -Os
4186 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4188 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4190 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4191 [19486] math: S390: Math tests fail with "Exception Inexact set".
4192 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4193 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4195 [19590] math: Fail to build shared objects that use libmvec.so functions.
4199 * The following bugs are resolved with this release:
4201 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4202 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4203 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4204 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4205 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4206 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4207 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4208 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4209 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4210 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4211 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4212 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4213 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4214 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4215 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4216 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4217 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4218 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4219 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4220 18657, 18676, 18694, 18696, 18887.
4222 * Cache information can be queried via sysconf() function on s390 e.g. with
4223 _SC_LEVEL1_ICACHE_SIZE as argument.
4225 * A buffer overflow in gethostbyname_r and related functions performing DNS
4226 requests has been fixed. If the NSS functions were called with a
4227 misaligned buffer, the buffer length change due to pointer alignment was
4228 not taken into account. This could result in application crashes or,
4229 potentially arbitrary code execution, using crafted, but syntactically
4230 valid DNS responses. (CVE-2015-1781)
4232 * The time zone file parser has been made more robust against crafted time
4233 zone files, avoiding heap buffer overflows related to the processing of
4234 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4235 large time zone data files. Overly long time zone specifiers in the TZ
4236 variable no longer result in stack overflows and crashes.
4238 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4239 for LD and GD on x86 and x86-64, has been implemented. You will need
4240 binutils-2.24 or later to enable this optimization.
4242 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4243 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4244 Hat). These updates cause user visible changes, such as the fix for bug
4247 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4248 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4249 condition in some applications.
4251 * Added vector math library named libmvec with the following vectorized x86_64
4252 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4254 The library can be disabled with --disable-mathvec. Use of the functions is
4255 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4256 Shared library libmvec.so is linked in as needed when using -lm (no need to
4257 specify -lmvec explicitly for not static builds).
4258 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4260 * A new fmemopen implementation has been added with the goal of POSIX
4261 compliance. The new implementation fixes the following long-standing
4262 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4263 old implementation is still present for use be by existing binaries.
4265 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4266 releases. It has been fixed to match 2.19 and older, but binaries built
4267 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4269 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4270 Contributed by Roland McGrath (Google).
4272 * The header <regexp.h> is deprecated, and will be removed in a future
4273 release. Use of this header will trigger a deprecation warning.
4274 Application developers should update their code to use <regex.h> instead.
4276 This header was formerly part of SUS, but was deprecated in 1994 and
4277 removed from the standard in 2001. Also, the glibc implementation
4278 leaks memory. See BZ#18681 for more details.
4282 * The following bugs are resolved with this release:
4284 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4285 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4286 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4287 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4288 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4289 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4290 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4291 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4292 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4293 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4296 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4297 too little memory for the to-be-scanned arguments and overflow the
4298 allocated buffer. The implementation now correctly computes the required
4299 buffer size when using malloc, and switches to malloc from alloca as
4302 * A new semaphore algorithm has been implemented in generic C code for all
4303 machines. Previous custom assembly implementations of semaphore were
4304 difficult to reason about or ensure that they were safe. The new version
4305 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4306 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4307 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4309 * Port to Altera Nios II has been contributed by Mentor Graphics.
4311 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4312 implementations for powerpc64/powerpc64le.
4313 Implemented by Adhemerval Zanella (IBM).
4315 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4316 and powerpc64le. This may improve lock scaling of existing programs on
4317 HTM capable systems. The lock elision code is only enabled with
4318 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4319 powerpc will issue a transaction abort on every syscall to avoid side
4320 effects being visible outside transactions.
4322 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4323 AArch64. Contributed by ARM Ltd.
4325 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4327 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4328 under certain input conditions resulting in the execution of a shell for
4329 command substitution when the application did not request it. The
4330 implementation now checks WRDE_NOCMD immediately before executing the
4331 shell and returns the error WRDE_CMDSUB as expected.
4333 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4334 processing format strings with a large number of format specifiers.
4336 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4337 infinite loop if the DNS response contained a PTR record of an unexpected
4340 * The minimum GCC version that can be used to build this version of the GNU
4341 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4342 still be used to compile programs using the GNU C Library.
4344 * The GNU C Library is now built with -Werror by default. This can be
4345 disabled by configuring with --disable-werror.
4347 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4349 * The obsolete sigvec function has been removed. This was the original
4350 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4351 programs have been using instead for about 25 years. Of course, ABI
4352 compatibility for old binaries using sigvec remains intact.
4354 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4355 with newer versions of bison.
4357 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4358 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4359 registers overlay two consecutive single-precision registers. MIPS32R2
4360 introduced a new FPU mode (FR=1) where double-precision registers extend the
4361 corresponding single-precision registers which is incompatible with the
4362 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4363 require the use of FR=1 making a transition necessary. New o32 ABI
4364 extensions enable users to migrate over time from the original o32 ABI
4365 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4366 tracks the ABI of any loaded object and verifies that new objects are
4367 compatible. Mode transitions will also be requested as required and
4368 unsupportable objects will be rejected. The ABI checks include both soft and
4369 hard float ABIs for o32, n32 and n64.
4371 GCC 5 with GNU binutils 2.25 onwards:
4372 It is strongly recommended that all o32 system libraries are built using the
4373 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4374 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4375 compiler using --with-fp-32=xx to set this by default.
4379 * The following bugs are resolved with this release:
4381 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4382 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4383 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4384 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4385 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4386 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4387 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4388 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4389 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4390 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4391 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4392 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4393 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4394 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4395 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4397 * Reverted change of ABI data structures for s390 and s390x:
4398 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4399 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4400 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4401 are preserved pointing straight to the same implementation as the old ones.
4402 Given that, new callers will simply provide a too-big buffer to these
4403 functions. Any applications/libraries out there that embed jmp_buf or
4404 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4405 against 2.19 headers will have to rebuilt again. This is necessary in any
4406 case to revert the breakage in their ABI caused by the glibc change.
4408 * Support for file description locks is added to systems running the
4409 Linux kernel. The standard file locking interfaces are extended to
4410 operate on file descriptions, not file descriptors, via the use of
4411 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4412 are associated with an open file instead of a process.
4414 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4416 * The minimum Linux kernel version that this version of the GNU C Library
4417 can be used with is 2.6.32.
4419 * Running the testsuite no longer terminates as soon as a test fails.
4420 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4421 with PASS or FAIL lines for individual tests. A summary of the results is
4422 printed, including a list of failing lists, and "make check" exits with
4423 error status if there were any unexpected failures. "make check
4424 stop-on-test-failure=y" may be used to keep the old behavior.
4426 * The am33 port, which had not worked for several years, has been removed
4429 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4430 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4431 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4432 conflicted with POSIX (support for which was removed in 2.19), the
4433 interfaces those macros enabled remain available when compiling with
4434 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4435 test macros defined.
4437 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4439 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4440 This may improve lock scaling of existing programs on TX capable systems.
4441 The lock elision code is only built with --enable-lock-elision=yes and
4442 then requires a GCC version supporting the TX builtins. With lock elision
4443 default mutexes are elided via __builtin_tbegin, if the cpu supports
4444 transactions. By default lock elision is not enabled and the elision code
4447 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4448 copy the path argument. This allowed programs to cause posix_spawn to
4449 deference a dangling pointer, or use an unexpected pathname argument if
4450 the string was modified after the posix_spawn_file_actions_addopen
4453 * All supported architectures now use the main glibc sysdeps directory
4454 instead of some being in a separate "ports" directory (which was
4455 distributed separately before glibc 2.17).
4457 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4458 On configurations that support it (all Linux configurations), it's now
4459 used regardless of the --enable-add-ons switch to configure. It is no
4460 longer possible to build such configurations without pthreads support.
4462 * Locale names, including those obtained from environment variables (LANG
4463 and the LC_* variables), are more tightly checked for proper syntax.
4464 setlocale will now fail (with EINVAL) for locale names that are overly
4465 long, contain slashes without starting with a slash, or contain ".." path
4466 components. (CVE-2014-0475) Previously, some valid locale names were
4467 silently replaced with the "C" locale when running in AT_SECURE mode
4468 (e.g., in a SUID program). This is no longer necessary because of the
4471 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4472 with application code using Intel MPX instructions. (With all previous
4473 versions, the MPX register state could be clobbered when making calls
4474 into or out of a shared library.) Note that while the new dynamic
4475 linker is compatible with all known x86 hardware whether or not it
4476 supports Intel MPX, some x86 instruction-set emulators might fail to
4477 handle the new instruction encodings. This is known to affect Valgrind
4478 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4479 release), and might affect other tools that do instruction emulation.
4481 * Support for loadable gconv transliteration modules has been removed.
4482 The support for transliteration modules has been non-functional for
4483 over a decade, and the removal is prompted by security defects. The
4484 normal gconv conversion modules are still supported. Transliteration
4485 with //TRANSLIT is still possible, and the //IGNORE specifier
4486 continues to be supported. (CVE-2014-5119)
4488 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4489 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4490 resulting a denial-of-service security vulnerability in applications which
4491 use functions related to iconv. (CVE-2014-6040)
4495 * The following bugs are resolved with this release:
4497 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4498 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4499 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4500 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4501 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4502 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4503 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4504 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4505 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4506 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4507 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4508 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4509 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4510 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4511 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4512 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4513 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4514 16431, 16453, 16474, 16506, 16510, 16529
4516 * Slovenian translations for glibc messages have been contributed by the
4517 Translation Project's Slovenian team of translators.
4519 * The public headers no longer use __unused nor __block. This change is to
4520 support compiling programs that are derived from BSD sources and use
4521 __unused internally, and to support compiling with Clang's -fblock
4522 extension which uses __block.
4524 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4525 large collation sequences to optimize multiple passes. This cache
4526 computation may overflow for large collation sequences and may cause a
4527 stack or buffer overflow. This is now fixed to use a slower algorithm
4528 which does not use a cache if there is an integer overflow.
4530 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4531 rules for large collation sequences to optimize multiple passes and falls
4532 back to alloca if malloc fails, resulting in a possible stack overflow.
4533 The implementation now falls back to an uncached collation sequence lookup
4536 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4537 initialized for static applications resulting in the security feature
4538 being disabled. The pointer guard is now correctly initialized to a
4539 random value for static applications. Existing static applications need
4540 to be recompiled to take advantage of the fix (bug 15754).
4542 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4543 to the d_name member of struct dirent, or omit the terminating NUL
4544 character. (Bugzilla #14699).
4546 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4547 aligned_alloc functions could allocate too few bytes or corrupt the
4548 heap when passed very large allocation size values (Bugzilla #15855,
4551 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4552 for AF_INET6 has been fixed (Bugzilla #16072).
4554 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4555 pap_CW, quz_PE, the_NP.
4557 * Substantially revised locales: gd_GB, ht_HT
4559 * The LC_ADDRESS field was updated to support country_car for almost all
4562 * ISO 1427 definitions were updated.
4564 * ISO 3166 definitions were updated.
4566 * The localedef utility now supports --big-endian and --little-endian
4567 command-line options to generate locales for a different system from that
4568 for which the C library was built.
4570 * Binary locale files now only depend on the endianness of the system for
4571 which they are generated and not on other properties of that system. As a
4572 consequence, binary files generated with new localedef may be incompatible
4573 with old versions of the GNU C Library, and binary files generated with
4574 old localedef may be incompatible with this version of the GNU C Library,
4575 in the following circumstances:
4577 + Locale files may be incompatible on m68k systems.
4579 + Locale archive files (but not separate files for individual locales) may
4580 be incompatible on systems where plain "char" is signed.
4582 * The configure option --disable-versioning has been removed. Builds with
4583 --disable-versioning had not worked for several years.
4585 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4586 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4588 * SystemTap probes for malloc have been introduced.
4590 * SystemTap probes for slow multiple precision fallback paths of
4591 transcendental functions have been introduced.
4593 * Support for powerpc64le has been added.
4595 * The soft-float powerpc port now supports e500 processors.
4597 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4599 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4600 set of header declarations that are enabled by default, even when other
4601 feature test macros or compiler options such as -std=c99 would otherwise
4602 disable some of those declarations.
4604 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4605 conflict with POSIX. The libbsd-compat library (which was a dummy library
4606 that did nothing) has also been removed.
4608 * Preliminary documentation about Multi-Thread, Async-Signal and
4609 Async-Cancel Safety has been added.
4611 * Change of ABI data structures for s390 and s390x:
4612 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
4613 allow for future hardware extensions. All library functions that accept or
4614 return these structures were versioned in order to provide backwards
4615 compatibility with existing code. However, not all cases can be handled
4616 with interface versioning. If an application embeds either structure into
4617 another structure and that structure is passed to another compilation unit
4618 which expects the newer larger-sized object then any access to the new
4619 fields will result in undefined behaviour. Similarly any access to fields
4620 that were moved by the enlarging of the structures will cause undefined
4621 behaviour. To fix the undefined behaviour all objects that are part of the
4622 final in-memory image must agree on the size of structures, and this may
4623 require recompilation.
4627 * The following bugs are resolved with this release:
4629 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
4630 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
4631 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
4632 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
4633 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
4634 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
4635 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
4636 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
4637 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
4638 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
4639 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
4640 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
4641 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
4644 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
4645 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
4646 Distributions can re-enable building and using pt_chown via the new configure
4647 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
4648 considerable security risks and should only be used if the distribution
4649 understands and accepts the risks.
4651 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
4654 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
4655 fixed (Bugzilla #15330).
4657 * Add support for calling C++11 thread_local object destructors on thread
4658 and program exit. This needs compiler support for offloading C++11
4659 destructor calls to glibc.
4661 * Improved worst case performance of libm functions with double inputs and
4664 * Support for priority inherited mutexes in pthread condition variables on
4665 non-x86 architectures.
4667 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
4669 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
4671 * Optimized string functions for ARM. Implemented by Will Newton and
4674 * Optimized libm functions for SPARC. Implemented by David S. Miller.
4676 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
4679 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
4680 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
4682 * Added a benchmark framework to track performance of functions in glibc.
4684 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
4685 It is based on draft TS 18661 and currently enabled as a GNU extension.
4687 * On Linux, the clock function now uses the clock_gettime system call
4688 for improved precision, rather than old times system call.
4690 * Added support for version-3 tz format files. This is needed when using
4691 the tz database release 2013e or later, and affects a few unusual cases --
4692 currently only TZ='America/Godthab' for time stamps after 2037.
4694 * Added new API functions pthread_getattr_default_np and
4695 pthread_setattr_default_np to get and set the default pthread
4696 attributes of a process.
4698 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
4699 This may improve lock scaling of existing programs on TSX capable systems.
4700 When the --enable-lock-elision=yes parameter is specified at configure
4701 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
4704 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
4705 availability). Implemented by Ryan S. Arnold.
4707 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
4711 * The following bugs are resolved with this release:
4713 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
4714 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
4715 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
4716 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
4717 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
4718 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
4719 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
4720 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
4721 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
4722 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
4723 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
4724 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
4725 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
4726 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
4727 14879, 14889, 14893, 14898, 14914.
4729 * Optimization of memcpy for MIPS.
4731 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
4732 EMFILE has been fixed (Bugzilla #14889).
4734 * The add-on ports collection is now distributed in the "ports" subdirectory
4735 of the main GNU C Library distribution, rather than separately.
4737 * Port to ARM AArch64 contributed by Linaro.
4739 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
4740 Optimized versions of memcpy, memset, and memcmp added for System z10 and
4742 Implemented by Andreas Krebbel.
4744 * The new function secure_getenv allows secure access to the environment,
4745 returning NULL if running in a SUID/SGID process. This function replaces
4746 the internal function __secure_getenv.
4748 * SystemTap static probes have been added into the dynamic linker.
4749 Implemented by Gary Benson.
4751 * Optimizations of string functions strstr, strcasestr and memmem.
4752 Implemented by Maxim Kuvyrkov.
4754 * The minimum Linux kernel version that this version of the GNU C Library
4755 can be used with is 2.6.16.
4757 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
4758 powerpc POWER7. Implemented by Will Schmidt.
4760 * New configure option --disable-nscd builds the C library such that it
4761 never attempts to contact the Name Service Caching Daemon (nscd).
4762 New configure option --disable-build-nscd avoids building nscd itself;
4763 this is the default if --disable-nscd is used.
4765 * Improved support for cross-compilation, including cross-testing and
4766 bootstrap builds without a previously built glibc.
4768 * Several testsuite tests are now able to test multiple IFUNC variants of an
4769 interface, rather than just testing the one that would be chooen by
4772 * New configure options --with-bugurl and --with-pkgversion, for
4773 distributors to use to embed their bug-reporting and package version
4774 information in --help and --version output.
4776 * The ttyname and ttyname_r functions on Linux now fall back to searching for
4777 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
4778 allows creation of chroots without the procfs mounted on /proc.
4780 * The `crypt' function now fails if passed salt bytes that violate the
4781 specification for those values. On Linux, the `crypt' function will
4782 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
4783 enabled, and fail on encrypted strings using the MD5 or DES algorithm
4784 when the mode is enabled.
4786 * The `clock_*' suite of functions (declared in <time.h>) is now available
4787 directly in the main C library. Previously it was necessary to link with
4788 -lrt to use these functions. This change has the effect that a
4789 single-threaded program that uses a function such as `clock_gettime' (and
4790 is not linked with -lrt) will no longer implicitly load the pthreads
4791 library at runtime and so will not suffer the overheads associated with
4792 multi-thread support in other code such as the C++ runtime library.
4794 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
4799 * The following bugs are resolved with this release:
4801 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
4802 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
4803 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
4804 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
4805 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
4806 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
4807 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
4808 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
4809 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
4810 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
4811 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
4812 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
4813 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
4814 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
4815 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
4816 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
4817 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
4818 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
4819 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
4820 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
4821 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
4822 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
4825 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
4826 configuring glibc with:
4827 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
4828 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
4829 Implemented by H.J. Lu.
4833 + define static_assert
4835 + do not declare gets
4837 + declare at_quick_exit and quick_exit also for ISO C11
4839 + aligned_alloc. NB: The code is deliberately allows the size parameter
4840 to not be a multiple of the alignment. This is a moronic requirement
4841 in the standard but it is only a requirement on the caller, not the
4844 + timespec_get added
4846 + uchar.h support added
4848 + CMPLX, CMPLXF, CMPLXL added
4850 Implemented by Ulrich Drepper.
4852 * Support for the IA-64 has been moved to ports.
4854 * Remove support for anything but ELF binary format
4856 * Checking versions of poll, ppoll added.
4857 Implemented by Ulrich Drepper.
4859 * More generic and 64-bit performance optimizations to math functions.
4860 Implemented by Ulrich Drepper.
4862 * New configure option --enable-obsolete-rpc makes the deprecated RPC
4863 headers and functions available at compile time as they were before
4864 version 2.14. This option will be removed at some time in the future
4865 after the TI-RPC library becomes fully sufficient for the needs of
4866 existing applications.
4868 * Compatibility code for Linux kernel versions before 2.4 has been removed.
4869 Note that glibc is not expected to work with any Linux kernel version
4872 * New header <sys/auxv.h> and function getauxval allowing easy access to
4873 the AT_* key-value pairs passed from the Linux kernel. The header also
4874 defines the HWCAP_* bits associated with the AT_HWCAP key.
4876 * New locales: mag_IN
4878 * New configure option --enable-systemtap builds SystemTap static probes
4879 into libc for setjmp and longjmp and into libpthread for various operations.
4880 So far the setjmp/longjmp probes and some of the libpthread probes are
4881 provided only for i*86 and x86_64.
4882 Implemented by Roland McGrath and Rayson Ho.
4884 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
4886 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
4889 * More optimized functions for SPARC. Implemented by David S. Miller.
4891 * Improved support for cross-compilation, especially bootstrap builds
4892 without a previously built glibc.
4894 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
4895 Chris Metcalf from Tilera.
4897 * Support for the old ARM ABI has been removed from ports. Only the EABI is
4898 now supported for ARM processors.
4900 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
4901 as the name of the dynamic linker, to distinguish it from the
4902 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
4904 * Support for CRIS has been removed from ports.
4906 * A new class of installed header has been documented for low-level
4907 platform-specific functionality. PowerPC added the first instance with a
4908 function to provide time base register access. Contributed by Tulio
4909 Magno Quites Machado Filho.
4911 * ix86 configurations now install header files that are consistent with
4912 what x86-64 configurations install. These same header files can be used
4913 for -m32, -m64, or -mx32 builds.
4914 Contributed by H.J. Lu.
4916 * Math library bug fixes. A thorough audit of all open math library bugs was
4917 conducted by Joseph Myers. Significant progress was made on many math
4918 library bugs resulting in more accurate exceptions and function results.
4919 Many thanks to all those that contributed including Andreas Jaeger for his
4920 patch review and work on the x87 trigonometric instruction issues.
4922 * Timezone data is no longer installed. Timezone-related binaries and scripts
4923 will continue to be installed. Users should obtain their timezone data from
4924 their distribution provider or from the tzdata package at
4925 <ftp://munnari.oz.au/pub/>.
4929 * The following bugs are resolved with this release:
4931 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
4932 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
4933 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
4934 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
4935 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
4936 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
4937 13484, 13506, 13515, 13523, 13524, 13538, 13540
4939 * New program pldd to list loaded object of a process
4940 Implemented by Ulrich Drepper.
4942 * Add nss_db support back to glibc. No more dependency on Berkeley db
4943 and support for initgroups lookups.
4944 Implemented by Ulrich Drepper.
4946 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
4947 Contributed by HJ Lu.
4949 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
4950 Contributed by HJ Lu.
4952 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
4953 on x86-32 and x86-64.
4954 Contributed by Liubov Dmitrieva.
4956 * Optimized strchr and strrchr for SSE on x86-32.
4957 Contributed by Liubov Dmitrieva.
4959 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
4960 for x86-64 and x86-32.
4961 Contributed by Liubov Dmitrieva.
4963 * New interfaces: scandirat, scandirat64
4964 Implemented by Ulrich Drepper.
4966 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
4967 Implemented by Ulrich Drepper.
4969 * nscd now also caches the netgroup database.
4970 Implemented by Ulrich Drepper.
4972 * Integrate libm with gcc's -ffinite-math-only option.
4973 Implemented by Ulrich Drepper.
4975 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
4976 to math functions. Implemented by Ulrich Drepper.
4978 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
4979 Implemented by Ulrich Drepper.
4981 * New Linux interfaces: process_vm_readv, process_vm_writev
4983 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
4984 Implemented by Ulrich Drepper.
4986 * Optimized nearbyint and strcasecmp for PPC.
4987 Implemented by Adhemerval Zanella.
4989 * New locales: bho_IN, unm_US, es_CU, ta_LK
4993 * The following bugs are resolved with this release:
4995 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
4996 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
4997 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
4998 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
4999 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5000 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5001 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5002 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5003 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5004 12795, 12811, 12813, 12814, 12841
5006 * The RPC implementation in libc is obsoleted. Old programs keep working
5007 but new programs cannot be linked with the routines in libc anymore.
5008 Programs in need of RPC functionality must be linked against TI-RPC.
5009 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5011 Visible changes of this change include (obviously) the inability to link
5012 programs using RPC functions without referencing the TI-RPC library and the
5013 removal of the RPC headers from the glibc headers.
5014 Implemented by Ulrich Drepper.
5016 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5017 syncfs, setns, sendmmsg
5019 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5020 yue_HK, lij_IT, mhr_RU
5022 * New encodings: CP770, CP771, CP772, CP773, CP774
5024 * New program sotruss to trace calls through PLTs
5025 Implemented by Ulrich Drepper.
5027 * The malloc hook implementation is marked deprecated and will be removed
5028 from the default implementation in the next version. The design never
5029 worked ever since the introduction of threads. Even programs which do
5030 not create threads themselves can use multiple threads created internally.
5034 * The following bugs are resolved with this release:
5036 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5037 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5038 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5039 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5042 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5044 * POWER7 optimizations: memset, memcmp, strncmp
5046 * New optimized string functions for x86-64: strnlen (SSE2),
5047 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5048 Implemented by Ulrich Drepper.
5052 * The following bugs are resolved with this release:
5054 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5055 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5056 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5057 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5058 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5059 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5060 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5061 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5063 * New interfaces: pthread_getname_np, pthread_setname_np
5065 * New Linux interface: recvmmsg
5067 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5069 * The dynamic linker now recognizes supported ABI versions from the
5070 EI_ABIVERSION field in the ELF header.
5071 Implemented by Ulrich Drepper.
5073 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5074 will not be used to fill in password fields in the passwd.byname replies.
5075 Instead it is used to synthesize the shadow.byname table, should it be
5076 missing. This is a useful mode in some installations involving Solaris.
5077 Implemented by Ulrich Drepper.
5079 * New locales: kok_IN, sq_MK, cv_RU
5083 * The following bugs are resolved with this release:
5085 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5086 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5087 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5088 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5089 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5090 10789, 10817, 10823, 10840, 10847
5092 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5094 Implemented by Ulrich Drepper.
5096 * Checking version of longjmp added that fails if an uninitialized stack
5097 frame would be created. Implemented by Ulrich Drepper.
5099 * STT_GNU_IFUNC is now supported in static executables.
5100 Implemented by H.J. Lu.
5102 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5104 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5105 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5106 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5107 Contributed by H.J. Lu.
5109 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5110 Implemented by Ulrich Drepper.
5112 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5114 Contributed by H.J. Lu.
5116 * Support for fma instruction in AVX on x86-64.
5117 Implemented by H.J. Lu and Ulrich Drepper.
5119 * AVX support in x86-64 auditing support in ld.so.
5120 Implemented by H.J. Lu.
5122 * STB_GNU_UNIQUE support added.
5123 Implemented by Ulrich Drepper.
5125 * Implement second fallback mode for optimized DNS lookup for even more
5126 broken environments. If two requests from the same port are not
5127 handled correctly close the socket and open a new one before sending
5128 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5129 can be used to select this mode right away, instead of rediscovering the
5130 necessity is every process again.
5131 Implemented by Ulrich Drepper.
5133 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5134 Implemented by Adam Tkac.
5136 * Optimized iconv conversions for S390x.
5137 Implemented by Andreas Krebbel.
5139 * Using condvars with PI mutexes is now more efficient due to kernel
5140 support for requeueing to PI futexes. NPTL support added for x86-64.
5141 Implemented by Ulrich Drepper.
5143 * New locales: ps_AF, my_MM
5147 * The following bugs are resolved with this release:
5149 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5150 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5151 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5152 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5153 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5155 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5156 Implemented by Ulrich Drepper.
5158 * New Linux interfaces: accept4, fallocate, fallocate64.
5159 Implemented by Ulrich Drepper.
5161 * Correct declarations of string function when used in C++ code. This
5162 could lead to compile errors for invalid C++ code.
5164 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5167 * New POSIX 2008 interface: psiginfo
5168 Implemented by Ulrich Drepper.
5170 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5171 Implemented by Ulrich Drepper.
5173 * Support for selecting between multiple function definitions at runtime
5174 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5176 * The libcrypt library can now use the hash function implementations in
5177 NSS. Implemented by Ulrich Drepper.
5179 * The malloc implementation can be compiled to be less memory efficient
5180 but higher performing in multi-threaded programs.
5181 Implemented by Ulrich Drepper.
5183 * New locales: nan_TW@latin, ks_IN
5185 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5186 Implemented by Ulrich Drepper.
5188 * Extended printf hook support. It is possible to use user-defined types
5189 and extend existing format specifiers.
5190 Implemented by Ulrich Drepper.
5192 * Handling for group shadow files has been added.
5193 Implemented by Ulrich Drepper.
5195 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5196 servers (the case, e.g., for some people using the built-in DNS
5197 server in ADSL modems/routers). There is a once-per-process timeout
5198 in case of a broken server. To avoid it, users can run nscd or put
5199 'options single-request' in /etc/resolv.conf.
5200 Implemented by Ulrich Drepper.
5204 * The following bugs are resolved with this release:
5206 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5207 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5208 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5209 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5210 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5212 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5213 up at the same time. Implemented by Ulrich Drepper.
5215 * TLS descriptors for LD and GD on x86 and x86-64.
5216 Implemented by Alexandre Oliva.
5218 * getaddrinfo now handles DCCP and UDPlite.
5219 Implemented by Ulrich Drepper.
5221 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5222 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5223 Implemented by Ulrich Drepper.
5225 * New implementation of memmem, strstr, and strcasestr which is O(n).
5226 Implemented by Eric Blake.
5228 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5230 * Implement "e" option for popen to open file descriptor with the
5231 close-on-exec flag set. Implemented by Ulrich Drepper.
5233 * Implement "b" mode for fmemopen. In this mode writes writes don't
5234 implicitly add a NUL byte and seeks from the end of the buffer really
5235 use the buffer end, not the string length as the basis.
5236 Implemented by Ulrich Drepper.
5238 * Many functions, exported and internal, now atomically set the close-on-exec
5239 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5241 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5243 Implemented by Pravin Satpute.
5245 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5249 * The following bugs are resolved with this release:
5251 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5252 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5253 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5254 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5255 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5256 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5257 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5259 * New locales: bo_CN, bo_IN, shs_CA.
5261 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5263 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5264 Implemented by Pravin Satpute.
5266 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5268 * nscd caches now all timeouts for DNS entries
5269 Implemented by Ulrich Drepper.
5271 * nscd is more efficient and wakes up less often.
5272 Implemented by Ulrich Drepper.
5274 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5275 vdprintf, and obstack_vprintf.
5276 Implemented by Jakub Jelinek.
5278 * Faster memset for x86-64.
5279 Implemented by Harsha Jagasia and H.J. Lu.
5281 * Faster memcpy on x86.
5282 Implemented by Ulrich Drepper.
5284 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5285 Implemented by Ulrich Drepper.
5287 * Faster sqrt and sqrtf implemention for some PPC variants.
5288 Implemented by Steven Munroe.
5292 * The following bugs are resolved with this release:
5294 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5295 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5296 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5297 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5298 5071, 5103, 5104, 5112, 5113, 5184, 5186
5300 * More checking functions: fread, fread_unlocked, open*, mq_open.
5301 Implemented by Jakub Jelinek and Ulrich Drepper.
5303 * Extend fortification to C++. Implemented by Jakub Jelinek.
5305 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5306 by not recognizing 'a' as a modifier when those specs are requested.
5307 Implemented by Jakub Jelinek.
5309 * PPC optimizations to math and string functions.
5310 Implemented by Steven Munroe.
5312 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5313 options to be passed. Implemented by Ulrich Drepper.
5315 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5317 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5318 Implemented by Ulrich Drepper.
5320 * Handle private futexes in the NPTL implementation.
5321 Implemented by Jakub Jelinek and Ulrich Drepper.
5323 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5324 Implemented by Roland McGrath and Ulrich Drepper.
5326 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5328 * SHA-256 and SHA-512 based password encryption.
5329 Implemented by Ulrich Drepper.
5331 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5332 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5335 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5336 Implemented by Ulrich Drepper.
5340 * The following bugs are resolved with this release:
5342 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5343 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5344 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5345 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5346 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5347 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5348 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5351 * New Linux interfaces: epoll_pwait, sched_getcpu.
5353 * New generic interfaces: strerror_l.
5355 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5359 * The following bugs are resolved with this release:
5361 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5362 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5363 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5364 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5365 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5366 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5367 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5368 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5369 3225, 3251, 3252, 3253, 3273
5371 * For Linux, the sorting of addresses returned by getaddrinfo now also
5372 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5373 Implemented by Ulrich Drepper.
5375 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5376 Implemented by Ulrich Drepper.
5378 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5380 * New iconv module for MIK. Contributed by Alexander Shopov.
5382 * For sites with broken group and/or passwd database, the auto-propagate
5383 option of nscd can prevent creating ID lookup entries from the results
5384 of a name lookup and vice versa. This usually is no problem but some
5385 site might have problems with the default behavior.
5386 Implemented by Ulrich Drepper.
5388 * Iterating over entire database in NIS can be slow. With the
5389 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5390 to trade time for memory. The entire database will be read at once.
5391 Implemented by Ulrich Drepper.
5393 * The interfaces introduced in RFC 3542 have been implemented by
5396 * Support for the new ELF hash table format was added by Ulrich Drepper.
5398 * Support for priority inheritance mutexes added by Jakub Jelinek and
5401 * Support for priority protected mutexes added by Jakub Jelinek.
5403 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5404 or_IN, csb_PL, fy_NL, sr_ME.
5408 * More overflow detection functions.
5410 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5411 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5413 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5414 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5415 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5416 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5417 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5418 by Masahide Washizawa.
5420 * It is now possible to install audit libraries for the dynamic linker using
5421 LD_AUDIT. Implemented by Ulrich Drepper.
5423 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5424 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5425 For a libc and libpthread that works well on Linux 2.4 kernels, we
5426 recommend using the stable 2.3 branch.
5428 * The new function open_wmemstream acts like open_memstream,
5429 but uses a wchar_t wide character buffer.
5431 * The new function ppoll is an improved version of poll, similar to pselect.
5433 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5434 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5435 renameat, unlinkat, linkat, symlinkat, readlinkat.
5437 * New Linux kernel system calls: unshare,
5438 inotify_init, inotify_add_watch, inotify_rm_watch.
5440 * The euidaccess function is now also known by the alias eaccess,
5441 for compatibility with some other systems.
5443 * Timezone data updated to 2006b version.
5447 * The following bugs are resolved with this release:
5449 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5450 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5451 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5452 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5453 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5454 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5456 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5458 * As of this release, GCC 4 can be used to compile the C Library.
5460 * Timezone data updated to 2005m version.
5464 * The following bugs are resolved with this release:
5466 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5467 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5468 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5469 777, 787, 821, 822, 823, 825
5471 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5475 * Support for RFC 3678. Real implementations exist only for Linux so far.
5476 Implemented by Ulrich Drepper.
5478 * nscd can now cache entries persistently. Expiring entries are reloaded.
5479 For speedups the cache can be shared in memory with client processes.
5480 Implemented by Ulrich Drepper.
5482 * nscd can now perform SELinux checks.
5483 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5485 * getaddrinfo queries are now cached. Canonical name lookup is performed
5487 Implemented by Ulrich Drepper.
5489 * The nothrow function attribute is used when headers are used by gcc when
5490 compiling C code. This can avoid significant amounts of exception
5493 * The malloc functions perform more error checking and are stricter when
5494 it comes to reacting on errors. The default action is to terminate
5495 the process after showing an error message. Implemented by Ulrich Drepper.
5497 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5498 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5500 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5501 namespaces using the new function dlmopen(). This feature is of course,
5502 like most other dynamic loading functionality, not available in statically
5503 linked applications. Implemented by Ulrich Drepper.
5505 * Low-overhead boundary checking variants of string and some stdio functions
5506 were added. These are to be used in conjunction with a gcc patch by
5507 Jakub Jelinek which adds calls to these functions if possible.
5508 Implemented by Jakub Jelinek and Ulrich Drepper.
5510 * Old code for several operating systems and machine architectures that
5511 have not been in working condition in a long time have been removed from
5512 the main source tree maintained by the GNU C Library's maintainers.
5513 These files are now reside in the separate `ports' source module
5514 that is usable as an add-on when building the library.
5518 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5519 interrogate the dynamic linker, compatible with the Solaris interface.
5521 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5522 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5524 * getifaddrs now uses the netlink interface on Linux to get its information.
5525 Implemented by Thorsten Kukuk.
5527 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5528 Implemented by Ulrich Drepper.
5530 * support for non-executable stacks on x86 has been added. Changes mostly
5533 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5536 * getaddrinfo now performs destination address selection according to
5541 * Thread-safe interfaces for many functions that access locale data
5542 were added in version 2.3, but these features were omitted from NEWS.
5543 Many functions have variants with an `_l' suffix that take a `locale_t'
5544 object as a parameter rather than consulting the current locale.
5545 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5546 create and maintain `locale_t' objects. Additionally, the new function
5547 `uselocale' sets "the current locale" (as used by functions not so
5548 parameterized) set for an individual thread. These features were added
5549 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5551 * The functions getresuid, getresgid, setresuid, and setresgid, which
5552 have long been available on Linux, are now declared in <unistd.h>
5553 and are now also available on the Hurd.
5555 * ELF thread-local storage support (TLS) now works on x86-64.
5557 * The new dynamic string token $LIB is expanded in shared library names.
5558 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5560 * Aldy Hernandez contributed complete software floating point support for
5561 PowerPC machines with no FPU.
5563 * fexecve is implemented on Linux.
5565 * The `btowc' function should work at least twice as fast due to
5566 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5568 * With approriate thread add-ons cancelable functions are now implemented
5569 in libc.so as well. No need to call the function in libpthread. This
5570 change allowed to finally disable the incorrect and expensive handling
5571 of weak definition in ld.so.
5573 * Yet more PLT entries in libc.so have been removed. We finally arrived
5574 at the bare minimum. Startup times improved appropriately.
5576 * Support for the new Linux/x86 system call interface was added. The
5577 AT_SYSINFO auxiliary vector entry is recognized and handled.
5581 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5584 * iconv (the program and the interface) now accepts empty names (excluding
5585 options like //TRANSLIT) to mean "use charset of current locale".
5587 * localedef can now transliterate characters in strings which are not in
5588 the provided charmap. The information from the input locale is used.
5590 * Prelinking support was added for ELF targets. This requires additional
5591 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5593 * Read-only stdio streams now use mmap to speed up operation by eliminating
5594 copying and buffer underflows. To use add 'm' to the mode string of
5595 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5597 * The malloc functions were completely rewritten by Wolfram Gloger based
5598 on Doug Lea's malloc-2.7.0.c.
5600 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5601 implementation of regex.
5603 * Bruno Haible upgraded the iconv and locale implementation to support
5606 * Contents of the LC_* and LANG environment variables in the CEN style are
5607 not recognized anymore. It never was used. Change by Ulrich Drepper.
5609 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5610 thread-local storage (TLS) ABI on some platforms.
5611 Changes by Ulrich Drepper. SH support by Kaz Kojima.
5613 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
5614 EUC-JISX0213, and TSCII.
5616 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
5617 BSD-compatible interface for getting all network interface addresses.
5618 Implementation for IPv4 by Roland McGrath.
5620 * Loading of locale data is faster due to the introduction of a locale
5621 archive. Implemented by Roland McGrath and Ulrich Drepper.
5623 * Startup times are significantly reduced by not using exported functions
5624 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
5627 * Steven Munroe contributed a port to PowerPC64/Linux.
5631 * The Hurd now uses the GNU libio implementation of stdio rather than the
5632 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
5634 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
5635 with the same behavior as the Linux system call of the same name.
5639 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
5640 128-bit long double format.
5642 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
5643 IBM1161, and IBM1162 charsets.
5645 * Andreas Jaeger contributed a port to x86-64/Linux.
5647 * Peter Bruin contributed a port to PowerPC/Hurd.
5649 * libc functions using I/O streams now can handle wide-oriented streams
5652 * optimizations in the dynamic linker. Binaries created by recent binutils
5653 versions start up quicker due to reduced time spent on relocations.
5655 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
5659 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
5660 asinh, atanh, j0 for the 128-bit long double format.
5662 * Bruno Haible updated all the code handling Unicode in some form to
5663 support Unicode 3.1.
5665 * Speed of regex for single-byte locales is back to previous levels.
5666 Patch by Isamu Hasegawa.
5668 * Alpha, SPARC, and IA-64 now also using floating stacks.
5670 * Startup time of internationalized applications greatly improved through
5671 iconv cache. Use iconvconfig to generate the cache file.
5672 Contributed by Ulrich Drepper.
5674 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
5675 severe performance problems. Patch by David Mosberger.
5677 * The Hurd port got a lot more functionality like AIO, various stdio
5678 extensions, etc. Mainly done by Roland McGrath.
5680 * mtrace can now lookup symbols in shared libraries.
5684 * Intel's IA-64 math library is largely integrated. It provides fast and
5685 accurate implementatations for most basic and standard math functions
5686 in float, double, and long double format.
5688 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
5689 and asin for the 96-bit long double format and asin, log, tan for the
5690 128-bit long double format.
5692 * The beginning of a last-bit accurate math library by IBM Haifa were added.
5693 The basic double functions exist today. Contributed by Abraham Ziv
5694 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
5695 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
5697 * An asynchronous name lookup library was added. The interface is designed
5698 after POSIX AIO. The proposal was circulated beforehand to get comments.
5699 No negative ones came in. Implemented by Ulrich Drepper.
5701 * Port to S390/64bit contributed by Martin Schwidefsky
5702 <schwidefsky@de.ibm.com>.
5704 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
5705 of functions for Linux/IA-64.
5707 * The RPC code is now thread safe. Threads can now use the same service
5708 of different services at the same time. Patch by Eric Norum
5709 <eric.norum@usask.ca> with some help by Ulrich Drepper.
5711 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
5712 family of functions for Linux/S390.
5714 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
5715 of functions for Linux/x86.
5717 * Port to Linux/CRIS contributed by Axis Communications.
5721 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
5722 we can now check for namespace violations and missing declarations. The
5723 result is that almost all headers are now Unix-compliant (as defined in
5724 the upcoming XPG6). The negative side is that some programs might need
5725 corrections, too, if they depend on the incorrect form of the headers in
5726 previous versions which defined too many symbols and included too many
5729 * regex now handles multibyte character sets correctly.
5730 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
5732 * iconv (the program) does now conform to the upcoming XPG6 and handles
5733 charmaps. Instead of the charset names the path of charmaps can be
5734 provided and the conversion happens based on this data.
5735 Contributed by Ulrich Drepper.
5737 * The locale program now provides detailed information about the installed
5742 only lists the names of the supported locales
5746 provides details such as country, language, and codeset name.
5747 Contributed by Ulrich Drepper.
5751 * The gencat program now parses the input file according to the charset
5752 selected by the LC_CTYPE category. This is important for stateful
5753 character sets. To make generating catalogs easier there is a way
5754 to overwrite the charset selected by the locale: before the first
5755 message or $ quote line the catalog can contain a line like
5757 $ codeset=ISO-8859-2
5759 to select the charset (ISO-8859-2 in this case).
5761 Implemented by Shinya Hanataka and Ulrich Drepper.
5763 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
5764 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
5765 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
5767 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
5768 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
5770 * The LANGUAGE environment variable is now ignored unless the locale is
5771 changed from the default "C" locale.
5773 * The usual bug fixes.
5777 * Greg McGary added runtime support for bounds checking using gcc's
5778 new -fbounded-pointers option. ix86 target is complete. PowerPC
5781 * Thorsten Kukuk added secure mode support to nscd.
5783 * The Berkeley db libraries have been removed.
5785 Related, the nss_db module is now in a separate package since it
5786 obviously requires a database library being available.
5788 * Wide character I/O streams implemented by Ulrich Drepper.
5790 * Functions from the extended socket API added by Ulrich Drepper.
5792 * Functions feenableexcept and fedisableexcept to control the
5793 behaviour of individual exceptions have been added by Andreas Jaeger.
5795 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
5797 * The resolver code has been updated from bind 8.2.3-T5B which supports
5798 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
5801 This change could in some situations effect backward compatibility. Since
5802 now `_res' is a thread-local instead of a global variable, modifying it
5803 in one thread does not have any effect in other threads.
5805 The resolver library was also extended to allow IPv6 as the transport
5806 protocol for the requests. This work was done by Stig Venaas.
5808 * Compatibility code for K&R C compilers has been removed from the
5809 header files. A ISO C compiler is needed to use the library
5810 (conforming to either C89 or C99 standard).
5812 * Complete rewrite of the localedef program to support multibyte character
5813 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
5814 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
5815 Implemented by Ulrich Drepper.
5817 Bruno Haible significantly improved the generation and use of the data
5818 structures for the wide character tables.
5820 * Plural handling in gettext implemented by Ulrich Drepper.
5822 * The utmp daemon has been removed.
5824 * The port to MIPS-Linux has been finished by Andreas Jaeger.
5826 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
5829 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
5831 * POSIX barriers implemented by Kaz Kylheku.
5833 * POSIX spawn function family implemented by Ulrich Drepper.
5835 * POSIX spinlocks are now available.
5837 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
5839 * the configure option --enable-kernel=X.Y.Z allows to strip out
5840 compatibility for kernel versions before X.Y.Z. This is currently only
5841 implemented for Linux.
5843 * the sockaddr_in6 structure changed. The IPv6 working group added a new
5844 field sin6_scope_id. This means that all programs using IPv6 should be
5845 recompiled. Don't expect binary compatibility with previous glibc
5848 * various conversion modules for IBM character sets contributed by
5851 * IA-64 port by Jes Sorensen and HJ Lu.
5865 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
5867 * New xdr functions are added; some rpc functions are now 64bit clean.
5869 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
5871 * Fixed known incompatibilities with glibc 2.0.
5873 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
5875 * Optimized a number of functions (especially the ELF dynamic loader).
5877 * Update timezone data files.
5879 * lots of charmaps corrections
5881 * some new locale definitions and charmaps
5886 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
5887 conform to POSIX member type requirements. Symbol versions have been
5888 adjusted as needed within the library, and for direct use by applications,
5889 but there is potential for problems if third-party libraries use
5890 struct timeval as part of their interface. This does not present
5891 a problem for X and other "essential" system libraries.
5893 * An additional locale model to support C++ Standard Library locale
5894 model and probably more was implemented by Ulrich Drepper.
5896 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
5899 * Miles Bader provided the `argp' function family to support hierachical
5900 command line argument parsing, layered on top of getopt.
5902 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
5904 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
5907 * scanf recognizes the %a and %A format for scanning floating point numbers.
5909 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
5910 information and interfaces for the available integer types.
5912 * about 130 new math functions were added to implement the ISO C9x math
5915 * the new header <complex.h> contains definitions of the complex math
5916 functions from ISO C 9X.
5918 * the new header <tgmath.h> defines generic macros to use complex or
5919 real valued functions.
5921 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
5923 * Andreas Jaeger provided a test suite for the math library.
5925 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
5927 * Ulrich Drepper added character set conversion functions (iconv).
5929 * Optimized string functions have been added.
5931 * The localedata addon is now part of glibc.
5933 * An implementation of profiling shared libraries was added by Ulrich Drepper.
5935 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
5936 daemon for NSS (nscd).
5938 Missing a better place here are some numbers on improvements. Under
5939 Linux 2.1.125 un-tar-ing the kernel sources takes
5943 using local files 12.19s 6.88s 22.91s
5945 using NIS 13.92s 8.91s 26.34s
5947 using NIS & nscd 10.37s 7.34s 25.30s
5949 using NIS+ 27.57s 30.37s 640.46s
5951 using NIS+ & nscd 10.25s 7.83s 26.51s
5953 using NIS & old nscd [1] 13.83s 8.32s 29.60s
5955 Keep in mind that non-namelookup related operations dominate above times.
5956 It was just a common complain that using NIS+ unpacking the kernel is
5959 [1] The old nscd implementation is not available anymore since it was
5960 distributed with glibc up to version 2.0.98 and thus is now replaced.
5962 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
5964 * Mark Kettenis provided a Hesiod NSS module.
5966 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
5967 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
5969 * rcmd can now handle netgroups (Dick Streefland).
5971 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
5974 * Support for the IPv6 protocol has been added to the socket API, as per the
5975 latest draft standards.
5977 * Support for Linux 2.2 has been added.
5979 * Interface changes relative to the latest 2.0.x release:
5980 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5981 addseverity NEW: Unix98
5982 alphasort64 NEW: LFS
5983 argp_err_exit_status NEW: argp, GNU ext
5984 argp_error NEW: argp, GNU ext
5985 argp_failure NEW: argp, GNU ext
5986 argp_help NEW: argp, GNU ext
5987 argp_parse NEW: argp, GNU ext
5988 argp_program_bug_address NEW: argp, GNU ext
5989 argp_program_version NEW: argp, GNU ext
5990 argp_program_version_hook NEW: argp, GNU ext
5991 argp_state_help NEW: argp, GNU ext
5992 argp_usage NEW: argp, GNU ext
5993 authdes_create NEW: Secure RPC
5994 authdes_getucred NEW: Secure RPC
5995 authdes_pk_create NEW: Secure RPC
5996 backtrace NEW: GNU ext.
5997 backtrace_symbols NEW: GNU ext.
5998 backtrace_symbols_fd NEW: GNU ext.
6000 cacosf NEW: ISO C 9x
6001 cacosh NEW: ISO C 9x
6002 cacoshf NEW: ISO C 9x
6003 cacoshl NEW: ISO C 9x
6004 cacosl NEW: ISO C 9x
6011 casinf NEW: ISO C 9x
6012 casinh NEW: ISO C 9x
6013 casinhf NEW: ISO C 9x
6014 casinhl NEW: ISO C 9x
6015 casinl NEW: ISO C 9x
6017 catanf NEW: ISO C 9x
6018 catanh NEW: ISO C 9x
6019 catanhf NEW: ISO C 9x
6020 catanhl NEW: ISO C 9x
6021 catanl NEW: ISO C 9x
6022 cbc_crypt NEW: Secure RPC
6026 ccoshf NEW: ISO C 9x
6027 ccoshl NEW: ISO C 9x
6033 cimagf NEW: ISO C 9x
6034 cimagl NEW: ISO C 9x
6035 clearerr_locked REMOVED
6036 clntunix_create NEW: sunrpc ext
6038 clog10 NEW: ISO C 9x
6039 clog10f NEW: ISO C 9x
6040 clog10l NEW: ISO C 9x
6050 cprojf NEW: ISO C 9x
6051 cprojl NEW: ISO C 9x
6053 crealf NEW: ISO C 9x
6054 creall NEW: ISO C 9x
6059 csinhf NEW: ISO C 9x
6060 csinhl NEW: ISO C 9x
6063 csqrtf NEW: ISO C 9x
6064 csqrtl NEW: ISO C 9x
6068 ctanhf NEW: ISO C 9x
6069 ctanhl NEW: ISO C 9x
6071 des_setparity NEW: Secure RPC
6072 ecb_crypt NEW: Secure RPC
6073 endutxent NEW: Unix98
6075 exp10f NEW: ISO C 9x
6076 exp10l NEW: ISO C 9x
6080 fattach NEW: STREAMS
6081 fdetach NEW: STREAMS
6085 feclearexcept NEW: ISO C 9x
6086 fegetenv NEW: ISO C 9x
6087 fegetexceptflag NEW: ISO C 9x
6088 fegetround NEW: ISO C 9x
6089 feholdexcept NEW: ISO C 9x
6091 feraiseexcept NEW: ISO C 9x
6092 ferror_locked REMOVED
6093 fesetenv NEW: ISO C 9x
6094 fesetexceptflag NEW: ISO C 9x
6095 fesetround NEW: ISO C 9x
6096 fetestexcept NEW: ISO C 9x
6097 feupdateenv NEW: ISO C 9x
6098 fflush_locked REMOVED
6102 fgets_unlocked NEW: GNU ext.
6103 fileno_locked REMOVED
6115 fputc_locked REMOVED
6116 fputs_unlocked NEW: GNU ext.
6117 fread_unlocked NEW: GNU ext.
6122 fstatvfs NEW: Unix98
6126 ftruncate64 NEW: LFS
6128 fwrite_unlocked NEW: GNU ext.
6129 gai_strerror NEW: IPv6
6133 getchar_locked REMOVED
6135 getdate_err NEW: Unix98
6136 getdate_r NEW: GNU ext.
6138 getnameinfo NEW: IPv6
6139 getnetname NEW: Secure RPC
6140 getpmsg NEW: STREAMS
6141 getpt NEW: Unix98 PTY
6142 getrlimit64 NEW: LFS
6143 getutxent NEW: Unix98
6144 getutxid NEW: Unix98
6145 getutxline NEW: Unix98
6146 glob64 NEW: GNU ext.
6147 globfree64 NEW: GNU ext.
6148 gnu_get_libc_release NEW: GNU ext.
6149 gnu_get_libc_version NEW: GNU ext.
6150 grantpt NEW: Unix98 PTY
6151 host2netname NEW: Secure RPC
6153 iconv_close NEW: iconv
6154 iconv_open NEW: iconv
6155 if_freenameindex NEW: IPv6
6156 if_indextoname NEW: IPv6
6157 if_nameindex NEW: IPv6
6158 if_nametoindex NEW: IPv6
6159 in6addr_any NEW: IPv6
6160 in6addr_loopback NEW: IPv6
6161 inet6_isipv4mapped NEW: IPv6
6162 isastream NEW: STREAMS
6163 iswblank NEW: GNU ext.
6164 key_decryptsession NEW: Secure RPC
6165 key_decryptsession_pk NEW: Secure RPC
6166 key_encryptsession NEW: Secure RPC
6167 key_encryptsession_pk NEW: Secure RPC
6168 key_gendes NEW: Secure RPC
6169 key_get_conv NEW: Secure RPC
6170 key_secretkey_is_set NEW: Secure RPC
6171 key_setnet NEW: Secure RPC
6172 key_setsecret NEW: Secure RPC
6173 llrint NEW: ISO C 9x
6174 llrintf NEW: ISO C 9x
6175 llrintl NEW: ISO C 9x
6176 llround NEW: ISO C 9x
6177 llroundf NEW: ISO C 9x
6178 llroundl NEW: ISO C 9x
6183 lrintf NEW: ISO C 9x
6184 lrintl NEW: ISO C 9x
6185 lround NEW: ISO C 9x
6186 lroundf NEW: ISO C 9x
6187 lroundl NEW: ISO C 9x
6189 makecontext NEW: Unix98
6190 mempcpy NEW: GNU ext.
6193 modify_ldt NEW: kernel
6197 nearbyint NEW: ISO C 9x
6198 nearbyintf NEW: ISO C 9x
6199 nearbyintl NEW: ISO C 9x
6200 netname2host NEW: Secure RPC
6201 netname2user NEW: Secure RPC
6202 nexttoward NEW: ISO C 9x
6203 nexttowardf NEW: ISO C 9x
6204 nexttowardl NEW: ISO C 9x
6208 passwd2des NEW: Secure RPC
6210 pow10f NEW: GNU ext.
6211 pow10l NEW: GNU ext.
6214 printf_size NEW: GNU ext.
6215 printf_size_info NEW: GNU ext.
6216 profil_counter REMOVED
6217 pthread_mutexattr_getkind_np REPLACED
6218 pthread_mutexattr_setkind_np REPLACED
6219 ptsname NEW: Unix98 PTY
6220 ptsname_r NEW: Unix98 PTY
6222 putchar_locked REMOVED
6223 putgrent NEW: GNU ext.
6225 putpmsg NEW: STREAMS
6226 pututxline NEW: Unix98
6230 readdir64_r NEW: LFS
6231 remquo NEW: ISO C 9x
6232 remquof NEW: ISO C 9x
6233 remquol NEW: ISO C 9x
6235 roundf NEW: ISO C 9x
6236 roundl NEW: ISO C 9x
6238 scalbln NEW: ISO C 9x
6239 scalblnf NEW: ISO C 9x
6240 scalblnl NEW: ISO C 9x
6242 sendfile NEW: kernel
6243 setcontext NEW: Unix98
6244 setrlimit64 NEW: LFS
6245 setutxent NEW: Unix98
6247 sigignore NEW: Unix98
6248 sigqueue NEW: POSIX.1b
6249 sigrelse NEW: Unix98
6250 sigset NEW: POSIX.1b
6251 sigtimedwait NEW: POSIX.1b
6252 sigwaitinfo NEW: POSIX.1b
6253 sincos NEW: GNU ext.
6254 sincosf NEW: GNU ext.
6255 sincosl NEW: GNU ext.
6259 strcasestr NEW: GNU ext.
6260 strtoimax NEW: ISO C 9x
6261 strtoumax NEW: ISO C 9x
6262 strverscmp NEW: GNU ext.
6263 svcauthdes_stats NEW: Secure RPC
6264 svcunix_create NEW: sunrpc etx
6265 svcunixfd_create NEW: sunrpc ext
6266 swapcontext NEW: Unix98
6267 tcgetsid NEW: Unix98 PTY
6268 tdestroy NEW: GNU ext.
6269 tgamma NEW: ISO C 9x
6270 tgammaf NEW: ISO C 9x
6271 tgammal NEW: ISO C 9x
6275 truncf NEW: ISO C 9x
6276 truncl NEW: ISO C 9x
6278 unlockpt NEW: Unix98 PTY
6279 updwtmpx NEW: Unix98
6280 user2netname NEW: Secure RPC
6281 utmpxname NEW: Unix98
6282 versionsort NEW: GNU ext.
6283 versionsort64 NEW: GNU ext.
6285 wcscasecmp NEW: GNU ext.
6286 wcsncasecmp NEW: GNU ext.
6287 wcsnlen NEW: GNU ext.
6288 wcstoimax NEW: ISO C 9x
6289 wcstoll NEW: ISO C 9x
6290 wcstoull NEW: ISO C 9x
6291 wcstoumax NEW: ISO C 9x
6293 wordexp NEW: POSIX.2
6294 wordfree NEW: POSIX.2
6295 write_profiling REMOVED
6296 xdecrypt NEW: Secure RPC
6297 xdr_authdes_cred NEW: Secure RPC
6298 xdr_authdes_verf NEW: Secure RPC
6299 xdr_cryptkeyarg NEW: Secure RPC
6300 xdr_cryptkeyarg2 NEW: Secure RPC
6301 xdr_cryptkeyres NEW: Secure RPC
6302 xdr_getcredres NEW: Secure RPC
6303 xdr_key_netstarg NEW: Secure RPC
6304 xdr_key_netstres NEW: Secure RPC
6305 xdr_keybuf NEW: Secure RPC
6306 xdr_keystatus NEW: Secure RPC
6307 xdr_netnamestr NEW: Secure RPC
6308 xdr_sizeof NEW: Secure RPC
6309 xdr_unixcred NEW: sunrpc ext
6310 xencrypt NEW: Secure RPC
6311 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6322 * inet_ntoa is thread-safe
6324 * updwtmp is moved from libutil to libc
6326 * rewrite of cbrt function
6328 * update of timezone data
6342 * add atoll function
6344 * fix complex problems in Berkeley DB code
6346 * fix math functions
6350 * fixed lots of header problems (especially Linux/GNU specific)
6352 * dynamic loader preserves all registers
6354 * Roland McGrath provided support for handling of auxiliary objects in
6355 the ELF dynamic loader.
6357 * support for parallel builds is improved
6361 * GNU extensions are no longer declared by default. To enable them you
6362 must define the macro `_GNU_SOURCE' in your program or compile with
6365 * The library has changed from using GNU ld symbol aliases to using weak
6366 symbols where available. The ELF object file format supports weak
6367 symbols; GNU ld also supports weak symbols in the a.out format. (There
6368 is also now support for other GNU ld extensions in ELF. Use the
6369 `--with-elf' option to configure to indicate you have ELF, and
6370 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6371 of many files which contained only symbol aliases, reducing the size of
6372 the source and the compiled library; many other files were renamed to
6373 less cryptic names previously occupied by the symbol alias files.
6374 There is a new header file <elf.h> for programs which operate on
6375 files in the ELF format.
6377 * Converted to Autoconf version 2, so `configure' has more options.
6378 Run `configure --help' to see the details.
6380 * The library can now be configured to build profiling, highly-optimized
6381 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6382 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6383 `configure' enable building these extra libraries. The shared library is
6384 built by default when using both ELF and GNU ld. When shared libraries
6385 are enabled, the new library `-ldl' is available for arbitrary run-time
6386 loading of shared objects; its interface is defined in <dlfcn.h>. The
6387 new header file <link.h> gives access to the internals of the run-time
6388 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6389 application of same name on other systems and it provides information
6390 about dynamically linked binaries.
6392 * The C library now provides the run-time support code for profiling
6393 executables compiled with `-pg'. Programs can control the profiling code
6394 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6395 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6396 the support for this file format was contributed by David Mosberger-Tang.
6398 * The math code has been replaced with a math library based on fdlibm from
6399 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6400 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6401 functions. The math functions now reside in a separate library, so
6402 programs using them will need to use `-lm' their linking commands.
6404 * John C. Bowman contributed optimized ix87 assembler inline functions.
6406 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6407 mechanism similar to that found in Solaris 2. This is now used for the
6408 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6409 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6410 file controls what services are used for each individual database. This
6411 works by loading shared libraries with names specified in `nsswitch.conf',
6412 so service modules can be changed or added at any time without even
6413 relinking any program. Currently there are the file, db, and NIS based
6414 NSS services available.
6416 * The new functions `strtoq' and `strtouq' parse integer values from
6417 strings, like `strtol' and `strtoul', but they return `long long int' and
6418 `unsigned long long int' values, respectively (64-bit quantities).
6420 * The new functions `strtof' and `strtold' parse floating-point values from
6421 strings, like `strtod', but they return `float' and `long double' values,
6422 respectively (on some machines `double' and `long double' are the same).
6424 * Ulrich Drepper has contributed new implementations of the floating-point
6425 printing and reading code used in the `printf' family of functions and
6426 `strtod', `strtof', and `strtold'. These new functions are perfectly
6427 accurate, and much faster than the old ones.
6429 * The implementation of the POSIX locale model was completely rewritten by
6430 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6431 to compile the POSIX locale definition.
6433 * The former dummy implementations of the strcoll and strxfrm function are
6434 now replaced by fully functional code contributed by Ulrich Drepper. The
6435 collation information comes from the POSIX locale definitions.
6437 * The new header <langinfo.h> defines an interface for accessing
6438 various locale-dependent data (using the locale chosen with `setlocale').
6440 * Ulrich Drepper has contributed a new suite of functions for operation on
6441 wide-character and multibyte-character strings, in <wchar.h>;
6442 and classification and case conversion of wide characters, in <wctype.h>.
6443 These new functions are conforming to the ISO C, Amendement 1 specification.
6445 * There is now a second implementation of the standard I/O library available.
6446 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6447 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6449 * You can now use positional parameter specifications in format strings
6450 for the `printf' and `scanf' families of functions. For example,
6451 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6452 ``Number 6, Mr Jones''. This is mainly useful when providing different
6453 format strings for different languages, whose grammars may dictate
6454 different orderings of the values being printed. To support this
6455 feature, the interface for `register_printf_handler' has changed; see
6456 the header file <printf.h> for details.
6458 * The `printf' and `scanf' families of functions now understand a new
6459 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6460 to group numbers as indicated by the locale; for `scanf' and friends, this
6461 says to accept as valid only a number with all the proper grouping
6462 separators in the right places. In the default "C" locale, numbers are
6463 not grouped; but locales for specific countries will define the usual
6464 conventions (i.e. separate thousands with `,' in the US locale).
6466 * The pgrp functions have been regularized, slightly incompatibly but much
6467 less confusingly. The core functions are now `getpgid' and `setpgid',
6468 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6469 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6470 provided for compatibility. There is no longer an incompatible `getpgrp'
6471 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6473 * The new header file <fts.h> and suite of functions simplify programs that
6474 operate on directory trees. This code comes from 4.4 BSD.
6476 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6477 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6478 NSS scheme used in glibc.
6480 * There is a new malloc debugging hook `__memalign_hook'.
6482 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6483 `unsigned int' in <sys/types.h>. These are for compatibility only and
6484 their use is discouraged.
6486 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6487 done differently, so that it works even without GNU ld.
6489 * New function `euidaccess' checks allowed access to a file like `access',
6490 but using the effective IDs instead of the real IDs.
6492 * The time zone data files have been updated for the latest and greatest
6493 local time conventions of the countries of the world.
6495 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6498 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6499 for formatting floating-point numbers. They are provided only for
6500 compatibility; new programs should use `sprintf' instead. There are
6501 also equivalent function for the `long double' floating-point type and
6502 all functions also exist in a reentrant form.
6504 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6505 functions for maintaining the login-record files (primarily of use to
6506 system programs such as `login'), and convenient functions for
6507 allocating and initializing a pseudo-terminal (pty) device.
6509 * Ulrich Drepper has contributed new support for System V style
6510 shared memory and IPC on systems that support it.
6512 * Ulrich Drepper has contributed several miscellaneous new functions found
6513 in System V: The `hsearch' family of functions provide an effective
6514 implementation of hash tables; `a64l' and `l64a' provide a very simple
6515 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6518 * Ulrich Drepper has contributed new reentrant counterparts for the
6519 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6521 * Ulrich Drepper has contributed new, highly-optimized versions of several
6522 string functions for the i486/Pentium family of processors.
6524 * Ulrich Drepper has updated the Linux-specific code, based largely
6525 on work done in Hongjiu Lu's version of GNU libc for Linux.
6526 The GNU library now supports Linux versions 2.0.10 and later,
6527 using the ELF object file format (i[3456]86-*-linux).
6529 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6531 * David Mosberger-Tang and Richard Henderson have ported the C library
6532 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6533 dynamic linking support for ELF/Alpha.
6535 * Richard Henderson contributed several Alpha optimized assembler function
6536 for arithmetic and string handling.
6538 * Ulrich Drepper has contributed a new set of message catalog functions to
6539 support multiple languages using the <libintl.h> interface, for use with
6540 his new package GNU gettext. Translation volunteers have contributed
6541 catalogs of the library's messages in Spanish, German, and Korean.
6543 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6544 program and the `catgets' function for reading the catalog files it
6545 creates. (The <libintl.h> interface is preferred; we include the
6546 <nl_types.h> interface using `catgets' only for source compatibility with
6547 programs already written to use it.)
6549 * New header file <values.h> gives SVID-compatible names for <limits.h>
6552 * Various new macros, declarations, and small header files for compatibility
6555 * New function `group_member' is a convenient way to check if a process has
6556 a given effective group ID.
6558 * When using GCC 2.7 and later, the socket functions are now declared in a
6559 special way so that passing an argument of type `struct sockaddr_in *',
6560 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6561 `struct sockaddr *' type, does not generate a type-clash warning.
6563 * New function `error' declared in header file <error.h> is a convenient
6564 function for printing error messages and optionally exiting; this is the
6565 canonical function used in GNU programs. The new functions `err', `warn',
6566 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6567 doing the same thing.
6569 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6570 POSIX.2 `glob' function to do ~ and {...} expansion.
6572 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6573 `clearenv' which is used in POSIX.9 is also available.
6575 * New function `getsid' returns session ID number on systems that support it.
6577 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6578 files <db.h> and <mpool.h> provide a rich set of functions for several
6579 types of simple databases stored in memory and in files, and <ndbm.h> is
6580 an old `ndbm'-compatible interface using the `db' functions. Link with
6581 `-ldb' to get these functions.
6583 * New macro `strdupa' copies a string like `strdup', but uses local stack
6584 space from `alloca' instead of dynamic heap space from `malloc'.
6586 * New function `strnlen' is like `strlen' but searches only a given maximum
6587 number of characters for the null terminator. `stpncpy', `strndup' and
6588 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6591 * New function `statfs' in header <sys/statfs.h>.
6593 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6594 provide convenient functions for operating on blocks of null-terminated
6597 * A new suite of functions in <utmp.h> handle all the details of reading
6598 and writing the utmp file.
6600 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6603 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6604 completely POSIX compliant and also implemented the extended functionality
6605 to handle alternate digit representation and alternate era date formats.
6607 * Ulrich Drepper provided an implementation of the `strptime' function
6608 defined in XPG4.2 which transforms a string into a `struct tm' value.
6610 * Paul Eggert provided the tzselect shell script as part of the timezone
6611 code. The shell script makes it easy to select the correct timezone
6614 * The implementation of the malloc family of functions is completely replaced
6615 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
6616 The implementation uses the mmap function (if available) and it is
6617 optimized for the use in multi threaded programs.
6619 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
6620 functions. This new functionality is usable by specifying a special
6621 salt string and it is compatible with implementation on *BSD systems.
6623 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
6624 `getsubopt' to handle second level command line options, `bsd_signal'
6625 to access BSD style `signal' functionality, the obsolete `regexp' style
6628 * the `lchown' function is available on system which support this
6631 * The implementation of the shadow password handling function was contributed
6634 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
6636 * POSIX.1g support was added. The <sys/select.h> header is available,
6637 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
6638 implementation of `getaddrinfo'.
6642 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
6644 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
6645 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
6647 * The new function `daemon' from 4.4 BSD is useful for server programs that
6648 want to put themselves in the background.
6650 * Joel Sherrill has contributed support for several standalone boards that
6651 run without an operating system.
6653 * `printf', `scanf' and friends now accept a `q' type modifier for long
6654 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
6656 * All of the code taken from BSD (notably most of the math and networking
6657 routines) has been updated from the BSD 4.4-Lite release.
6659 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
6661 * The new functions `getdomainname' and `setdomainname' fetch or change the
6662 YP/NIS domain name. These are system calls which exist on systems which
6665 * The time zone data files have been updated for the latest international
6668 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
6669 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
6673 * The C library now includes support for Sun RPC, from Sun's free
6674 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
6675 are included. (There is still no support for YP.)
6677 * Tom Quinn has contributed a port of the C library to SGI machines running
6678 Irix 4 (mips-sgi-irix4).
6680 * The new `lockf' function is a simplified interface to the locking
6681 facilities of `fcntl', included for compatibility.
6683 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
6685 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
6687 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
6690 * The error message printed by `assert' for a failed assertion now includes
6691 the name of the program (if using GNU ld) and the name of the calling
6692 function (with versions of GCC that support this).
6694 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
6696 * The library now includes the <sys/mman.h> header file and memory
6697 management functions `mmap', `munmap', `mprotect', `msync', and
6698 `madvise', on systems that support those facilities.
6700 * The interface for `mcheck' has changed slightly: the function called to
6701 abort the program when an allocation inconsistency is detected now takes
6702 an argument that indicates the type of failure. The new function
6703 `mprobe' lets you request a consistency check for a particular block at
6704 any time (checks are normally done only when you call `free' or `realloc'
6707 * It is now possible to easily cross-compile the C library, building on one
6708 system a library to run on another machine and/or operating system. All
6709 you need to do is set the variable `HOST_CC' in `configparms' to the
6710 native compiler for programs to run on the machine you are building on (a
6711 few generator programs are used on Unix systems); set `CC' to the
6714 * The new function `fexecve' (only implemented on the GNU system) executes
6715 a program file given a file descriptor already open on the file.
6719 * Brendan Kehoe has contributed most of a port to the DEC Alpha
6720 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
6722 * You can set the variable `libprefix' in `configparms' to specify a prefix
6723 to be prepended to installed library files; this makes it easy to install
6724 the GNU C library to be linked as `-lgnuc' or whatever.
6726 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
6727 copies a limited number of characters from a string, and returns the
6728 address of the last character written.
6730 * You no longer need to check for whether the installed `stddef.h' is
6731 compatible with the GNU C library. configure now checks for you.
6733 * You can now define a per-stream `fileno' function to convert the
6734 stream's cookie into an integral file descriptor.
6736 * ``malloc (0)'' no longer returns a null pointer. Instead, it
6737 allocates zero bytes of storage, and returns a unique pointer which
6738 you can pass to `realloc' or `free'. The behavior is undefined if
6739 you dereference this pointer.
6741 * The C library now runs on Sony NEWS m68k machines running either
6742 NewsOS 3 or NewsOS 4.
6744 * The new `syscall' function is a system-dependent primitive function
6745 for invoking system calls. It has the canonical behavior on Unix
6746 systems, including unreliable return values for some calls (such as
6747 `pipe', `fork' and `getppid').
6749 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
6750 to `EAGAIN', which is the preferred name. On systems whose kernels
6751 use two distinct codes, the C library now translates EWOULDBLOCK to
6752 EAGAIN in every system call function.
6756 * The GNU C Library Reference Manual is now distributed with the library.
6757 `make dvi' will produce a DVI file of the printed manual.
6758 `make info' will produce Info files that you can read on line using C-h i
6759 in Emacs or the `info' program.
6760 Please send comments on the manual to bug-glibc-manual@gnu.org.
6762 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
6764 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
6766 * Jason Merrill has contributed a port to the Sequent Symmetry running
6767 Dynix version 3 (i386-sequent-dynix).
6769 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
6770 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
6772 * New function `memory_warnings' lets you arrange to get warnings when
6773 malloc is running out of memory to allocate, like Emacs gives you.
6775 * The C library now contains the relocating allocator used in Emacs 19 for
6776 its editing buffers. This allocator (ralloc) minimizes allocation
6777 overhead and fragmentation by moving allocated regions around whenever it
6778 needs to. You always refer to a ralloc'd region with a "handle" (a
6779 pointer to a pointer--an object of type `void **').
6781 * There is a new `printf' format: `%m' gives you the string corresponding
6782 to the error code in `errno'.
6784 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
6785 or `%[' conversion, but instead of filling in a fixed-sized buffer you
6786 pass, the `a' modifier says to fill in a `char **' you pass with a
6789 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
6790 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
6791 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
6793 * `mkstemp' is a traditional Unix function to atomically create and open a
6794 uniquely-named temporary file.
6798 * The standard location for the file that says what the local timezone is
6799 has changed again. It is now `/usr/local/etc/localtime' (or more
6800 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
6802 * The distribution no longer contains any files with names longer than 14
6805 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
6806 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
6808 * New functions `ttyslot' and `syslog' from 4.4 BSD.
6812 * The configuration process has changed quite a bit. The `configure'
6813 script is now used just like the configuration scripts for other GNU
6814 packages. The `sysdeps' directory hierarchy is much rearranged.
6815 The file `INSTALL' explains the new scheme in detail.
6817 * The header files no longer need to be processed into ANSI C and
6818 traditional C versions. There is just one set of files to install, and
6819 it will work with ANSI or old C compilers (including `gcc -traditional').
6821 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
6822 MIPS DECStation running Ultrix 4.
6824 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
6825 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
6826 made itself into a shared library.
6828 * Yet further improved support for the i386, running 4.3 BSD-like systems
6829 (such as Mach 3 with the Unix single-server), or System V.
6831 * New function `strncasecmp' to do case-insensitive string comparison
6832 with limited length.
6834 * New function `strsep' is a reentrant alternative to `strtok'.
6836 * New functions `scandir' and `alphasort' for searching directories.
6838 * New function `setenv' is a better interface to `putenv'.
6840 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
6841 function for traversing a directory tree.
6843 * The GNU obstack package is now also part of the C library.
6844 The new function `open_obstack_stream' creates a stdio stream that
6845 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
6846 formatted output directly to an obstack.
6848 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
6849 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
6851 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
6853 * The new functions `strfry' and `memfrob' do mysterious and wonderful
6854 things to your strings.
6856 * There are some new test programs: test-fseek, testmb, and testrand.
6858 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
6859 These ports are not finished, but are a good starting place for really
6860 supporting those systems.
6862 * `/etc/localtime' is now the standard location for the file that says what
6863 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
6864 This follows the general principle that `/etc' is the place for all local
6865 configuration files.
6867 * The C library header files now use `extern "C"' when used by the C++
6868 compiler, so the C library should now work with C++ code.
6870 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
6871 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
6874 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
6875 function which uses the `merge sort' algorithm, and is said to be
6876 significantly faster than the old GNU `qsort' function. Merge sort is
6877 now the standard `qsort' function. The new algorithm can require a lot
6878 of temporary storage; so, the old sorting function is called when the
6879 required storage is not available.
6881 * The C library now includes Michael Glad's Ultra Fast Crypt, which
6882 provides the Unix `crypt' function, plus some other entry points.
6884 * The code and header files taken from 4.4 BSD have been updated with the
6885 latest files released from Berkeley.
6887 ----------------------------------------------------------------------
6890 Permission is granted to anyone to make or distribute verbatim copies
6891 of this document as received, in any medium, provided that the
6892 copyright notice and this permission notice are preserved,
6893 thus giving the recipient permission to redistribute in turn.
6895 Permission is granted to distribute modified versions
6896 of this document, or of portions of it,
6897 under the above conditions, provided also that they
6898 carry prominent notices stating who last changed them.
6901 version-control: never