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 * The dynamic loader now prints an error message, "ld.so/libc.so
13 mismatch detected (upgrade in progress?)" if it detects that the
14 version of libc.so it loaded comes from a different build of glibc.
15 The new configure option --with-extra-version-id can be used to
16 specify an arbitrary string that affects the computation of the
19 Deprecated and removed features, and other changes affecting compatibility:
21 [Add deprecations, removals and changes affecting compatibility here]
23 Changes to build and runtime requirements:
25 [Add changes to build and runtime requirements here]
27 Security related changes:
29 [Add security related changes here]
31 The following bugs are resolved with this release:
33 [The release manager will add the list generated by
34 scripts/list-fixed-bugs.py just before the release.]
40 * Support for DT_RELR relative relocation format has been added to
41 glibc. This is a new ELF dynamic tag that improves the size of
42 relative relocations in shared object files and position independent
43 executables (PIE). DT_RELR generation requires linker support for
44 -z pack-relative-relocs option, which is supported for some targets
45 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
47 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
48 have been added. The pidfd functionality provides access to a process
49 while avoiding the issue of PID reuse on tranditional Unix systems.
51 * On Linux, the process_madvise function has been added. It has the
52 same functionality as madvise but alters the target process identified
55 * On Linux, the process_mrelease function has been added. It allows a
56 caller to release the memory of a dying process. The release of the
57 memory is carried out in the context of the caller, using the caller's
58 CPU affinity, and priority with CPU usage accounted to the caller.
60 * The “no-aaaa” DNS stub resolver option has been added. System
61 administrators can use it to suppress AAAA queries made by the stub
62 resolver, including AAAA lookups triggered by NSS-based interfaces
63 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
64 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
65 produce IPv6 addresses, and configured IPv6 name servers are still
66 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
67 are translated to A queries. The new resolver option is intended
68 primarily for diagnostic purposes, to rule out that AAAA DNS queries
69 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
70 validation by applications.
72 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
73 and mount_setattr have been added. They are part of the new Linux kernel
74 mount APIs that allow applications to more flexibly configure and operate
75 on filesystem mounts. The new mount APIs are specifically designed to work
78 * localedef now accepts locale definition files encoded in UTF-8.
79 Previously, input bytes not within the ASCII range resulted in
82 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
83 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
84 Support for the char8_t typedef has been added per the ISO C2X N2653
85 proposal. The functions are declared in uchar.h in C2X mode or when the
86 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
87 The char8_t typedef is declared in uchar.h in C2X mode or when the
88 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
89 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
91 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
92 added. The functions wrap getrandom and/or /dev/urandom to return high-
93 quality randomness from the kernel.
95 * Support for LoongArch running on Linux has been added. This port requires
96 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
99 - loongarch64-linux-gnu
101 The LoongArch ABI is 64-bit little-endian.
103 Deprecated and removed features, and other changes affecting compatibility:
105 * Support for prelink will be removed in the next release; this includes
106 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
107 variables and their functionality in the dynamic loader.
109 * The Linux kernel version check has been removed along with the
110 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
111 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
112 when libc.so is issued directly.
114 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
116 The following bugs are resolved with this release:
118 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
119 return different result with versioned "foo"
120 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
122 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
123 ./exe and ld.so adjusts argv on the stack
124 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
126 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
127 consuming the second byte of certain double byte characters
128 [25812] stdio: Libio vtable protection is sometimes only partially
130 [27054] libc: pthread_atfork handlers that call pthread_atfork
132 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
134 [28128] build: declare_symbol_alias doesn't work for assembly codes
135 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
136 [28752] nss: Segfault in getpwuid when stat fails
137 [28815] libc: realpath should not copy to resolved buffer on error
138 [28828] stdio: fputwc crashes
139 [28838] libc: FAIL: elf/tst-p_align3
140 [28845] locale: ld-monetary.c should be updated to match ISO C and
142 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
144 [28852] libc: getaddrinfo leaks memory with AI_ALL
145 [28853] libc: tst-spawn6 changes current foreground process group
146 (breaks test isolation)
147 [28857] libc: FAIL: elf/tst-audit24a
148 [28860] build: --enable-kernel=5.1.0 build fails because of missing
149 __convert_scm_timestamps
150 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
151 inaccurate without /sys and /proc
152 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
154 [28880] libc: Program crashes if date beyone 2038
155 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
156 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
157 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
158 rtm variants when avoiding overflow
159 [28922] build: The .d dependency files aren't always generated
160 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
162 [28936] build: nm: No such file
163 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
164 [28953] nss: NSS lookup result can be incorrect if function lookup
166 [28970] math: benchtest: libmvec benchmark doesn't build with make
168 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
169 /sys/devices/system/cpu/possible
170 [28993] libc: closefrom() iterates until max int if no access to
172 [28996] libc: realpath fails to copy partial result to resolved buffer
174 [29027] math: [ia64] fabs fails with sNAN input
175 [29029] nptl: poll() spuriously returns EINTR during thread
176 cancellation and with cancellation disabled
177 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
178 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
179 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
180 is promoted to global scope
181 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
182 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
183 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
185 [29097] time: fchmodat does not handle 64 bit time_t for
187 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
189 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
190 [29162] string: [PATCH] string.h syntactic error:
191 include/bits/string_fortified.h:110: error: expected ',' or ';'
192 before '__fortified_attr_access'
193 [29165] libc: [Regression] broken argv adjustment
194 [29187] dynamic-link: [regression] broken argv adjustment for nios2
195 [29193] math: sincos produces a different output than sin/cos
196 [29197] string: __strncpy_power9() uses uninitialised register vs18
197 value for filling after \0
198 [29203] libc: daemon is not y2038 aware
199 [29204] libc: getusershell is not 2038 aware
200 [29207] libc: posix_fallocate fallback implementation is not y2038
202 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
203 [29209] libc: isfdtype is not y2038 aware
204 [29210] network: ruserpass is not y2038 aware
205 [29211] libc: __open_catalog is not y2038 aware
206 [29213] libc: gconv_parseconfdir is not y2038 aware
207 [29214] nptl: pthread_setcanceltype fails to set type
208 [29225] network: Mistyped define statement in socket/sys/socket.h in
210 [29274] nptl: __read_chk is not a cancellation point
211 [29279] libc: undefined reference to `mbstowcs_chk' after
212 464d189b9622932a75302290625de84931656ec0
213 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
214 correct for !__ASSUME_TIME64_SYSCALLS
215 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
216 missing on microblaze with largefile
222 * Unicode 14.0.0 Support: Character encoding, character type info, and
223 transliteration tables are all updated to Unicode 14.0.0, using
224 generator scripts contributed by Mike FABIAN (Red Hat).
226 * Bump r_version in the debugger interface to 2 and add a new field,
227 r_next, support multiple namespaces.
229 * Support for the C.UTF-8 locale has been added to glibc. The locale
230 supports full code-point sorting for all valid Unicode code points. A
231 limitation in the framework for fnmatch, regexec, and regcomp requires
232 a compromise to save space and only ASCII-based range expressions are
233 supported for now (see bug 28255). The full size of the locale is
234 only ~400KiB, with 346KiB coming from LC_CTYPE information for
235 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
236 in various downstream distributions. The locale is not built into
237 glibc, and must be installed.
239 * <math.h> functions that round their results to a narrower type, and
240 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
241 18661-3:2015 and draft ISO C2X:
243 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
244 fMxsqrtfN and fMxsqrtfNx functions.
246 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
249 * <math.h> functions for floating-point maximum and minimum,
250 corresponding to new operations in IEEE 754-2019, and corresponding
251 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
252 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
253 fminimum_mag, fminimum_mag_num and corresponding functions for float,
254 long double, _FloatN and _FloatNx.
256 * <math.h> macros for single-precision float constants are added as a
257 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
258 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
261 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
262 predefined as specified in TS 18661-1:2014.
264 * The exp10 functions in <math.h> now have a corresponding type-generic
267 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
269 * printf-family functions now support the %b format for output of
270 integers in binary, as specified in draft ISO C2X, and the %B variant
271 of that format recommended by draft ISO C2X.
273 * A new DSO sorting algorithm has been added in the dynamic linker that uses
274 topological sorting by depth-first search (DFS), solving performance issues
275 of the existing sorting algorithm when encountering particular circular
276 object dependency cases.
278 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
279 the two DSO sorting algorithms. The default setting of '2' uses the
280 new DFS-based algorithm. The setting '1' switches to the old
281 algorithm used in glibc 2.33 and earlier.
283 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
284 to be used by compilers for optimizing usage of 'memcmp' when its
285 return value is only used for its boolean status.
287 * Support for automatically registering threads with the Linux rseq
288 system call has been added. This system call is implemented starting
289 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
290 operations on per-cpu data. It allows user-space to perform updates
291 on per-cpu data without requiring heavy-weight atomic operations.
292 Automatically registering threads allows all libraries, including
293 libc, to make immediate use of the rseq support by using the
294 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
295 variables. The GNU C Library manual has details on integration of
296 Restartable Sequences.
298 * A symbolic link to the dynamic linker is now installed under
299 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
301 * All programs and the testsuite in glibc are now built as position independent
302 executables (PIE) by default on toolchains and architectures that support it.
303 Further, if the toolchain and architecture supports it, even static programs
304 are built as PIE and the resultant glibc can be used to build static PIE
305 executables. A new option --disable-default-pie has been added to disable
306 this behavior and get a non-PIE build. This option replaces
307 --enable-static-pie, which no longer has any effect on the build
310 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
311 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
312 or to use huge pages directly with mmap calls with the MAP_HUGETLB
313 flags). The former can improve performance when Transparent Huge Pages
314 is set to 'madvise' mode while the latter uses the system reserved
317 * The printf family of functions now handles the flagged %#m conversion
318 specifier, printing errno as an error constant (similar to strerrorname_np).
320 * The function _dl_find_object has been added. In-process unwinders
321 can use it to efficiently locate unwinding information for a code
324 * Support for OpenRISC running on Linux has been added. This port requires
325 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
330 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
331 64-bit file offsets (LFS default).
333 * A new configure option, --with-rtld-early-cflags, can be used to
334 specify additional compiler flags for building the early startup code
335 of the dynamic linker. On targets which have CPU compatibility
336 checks, this can help to ensure that proper diagnostics are printed if
337 the dynamic loader runs on an incompatible CPU.
339 * On Linux, the epoll_pwait2 function has been added. It is similar to
340 epoll_wait with the difference the timeout has nanoseconds resolution.
342 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
343 enabling posix_spawn and posix_spawnp to set the controlling terminal in
344 the new process in a race free manner. This function is a GNU extension.
346 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
347 applications compiling with glibc and gcc 12 and later. Level 3 leverages
348 the __builtin_dynamic_object_size function to deliver additional
349 fortification balanced against additional runtime cost (checking non-constant
352 * The audit libraries will avoid unnecessary slowdown if it is not required
353 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
355 Deprecated and removed features, and other changes affecting compatibility:
357 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
358 has been removed since the first PT_LOAD segment is no longer executable
359 due to defaulting to -z separate-code.
361 * The r_version update in the debugger interface makes the glibc binary
362 incompatible with GDB binaries built without the following commits:
364 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
365 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
367 when audit modules or dlmopen are used.
369 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
371 * The --enable-static-pie option is no longer available. The glibc build
372 configuration script now automatically detects static-pie support in the
373 toolchain and architecture and enables it if available.
375 * The catchsegv script and associated libSegFault.so shared object have
376 been removed. There are widely-deployed out-of-process alternatives for
377 catching coredumps and backtraces.
379 * Support for prelink will be removed in the next release; this includes
380 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
381 variables and their functionality in the dynamic loader.
383 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
384 functionality to obtain the program mapping address can be achieved by
385 using LD_TRACE_LOADED_OBJECTS to value of 2.
387 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
388 support prelink PIE binaries.
390 Changes to build and runtime requirements:
392 * The audit module interface version LAV_CURRENT is increased to enable
393 proper bind-now support. The loader now advertises via the la_symbind
394 flags that PLT trace is not possible. New audit modules require the
395 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
396 modules are still loaded for all targets except aarch64.
398 * The audit interface on aarch64 is extended to support both the indirect
399 result location register (x8) and NEON Q register. Old audit modules are
400 rejected by the loader. Audit modules must be rebuilt to use the newer
401 structure sizes and the latest module interface version for LAV_CURRENT.
403 Security related changes:
405 CVE-2022-23219: Passing an overlong file name to the clnt_create
406 legacy function could result in a stack-based buffer overflow when
407 using the "unix" protocol. Reported by Martin Sebor.
409 CVE-2022-23218: Passing an overlong file name to the svcunix_create
410 legacy function could result in a stack-based buffer overflow.
412 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
413 function could result in a memory leak and potential access of
414 uninitialized memory. Reported by Qualys.
416 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
417 function may result in an off-by-one buffer underflow and overflow
418 when the current working directory is longer than PATH_MAX and also
419 corresponds to the / directory through an unprivileged mount
420 namespace. Reported by Qualys.
422 The following bugs are resolved with this release:
424 [12889] nptl: Race condition in pthread_kill
425 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
426 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
427 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
429 [15333] libc: Use 64-bit stat functions in installed programs
430 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
432 [15971] dynamic-link: No interface for debugger access to libraries
434 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
435 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
436 deeply nested DSO dependencies.
437 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
438 ID whose lifetime has not ended
439 [22542] network: buffer overflow in sunrpc clnt_create
441 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
443 [25947] malloc: memory leak in muntrace
444 [26045] math: fmaxf(inf, nan) does not always work
445 [26108] math: exp10() has problems with <tgmath.h>
446 [26779] build: benign use after realloc at localealias.c:329
447 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
448 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
449 [27945] build: build-many-glibcs.py doesn't configure GCC with
450 --enable-initfini-array
451 [27991] build: x86: sysdeps/x86/configure.ac breaks when
452 libc_cv_include_x86_isa_level is loaded from cache
453 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
454 in __REDIRECT_NTH macro
455 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
456 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
458 [28126] libc: nftw aborts for paths longer than PATH_MAX
459 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
460 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
462 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
463 [28185] math: Inaccurate j0f function (again)
464 [28199] locale: iconvconfig prefix flag behaves differently in glibc
466 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
467 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
469 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
470 [28223] libc: mips: clone does not align stack
471 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
473 [28256] malloc: Conditional jump or move depends on uninitialised
474 value(s) in __GI___tunables_init
475 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
476 spawn5 fail if stray fds are open
477 [28310] libc: Do not use affinity mask for sysconf
478 (_SC_NPROCESSORS_CONF)
479 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
481 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
483 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
484 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
486 [28353] network: Race condition on __opensock
487 [28357] dynamic-link: deadlock between pthread_create and ctors
488 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
489 [28361] nptl: Fix for bug 12889 causes setxid deadlock
490 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
491 [28390] localedata: Update locale data to Unicode 14.0.0
492 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
494 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
496 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
497 to tgkill (getpid (), gettid())
498 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
499 [28457] dynamic-link: Missing reldepmod4.so dependency for
501 [28469] time: linux: struct timex is not correctly set for 32-bit
502 systems with TIMESIZE=64
503 [28470] regex: Buffer read overrun in regular expression searching
504 [28475] string: Incorrect access attribute on memfrob
505 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
506 spurious NUL character on state reset
507 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
509 [28550] dynamic-link: FAIL: tst-dso-
510 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
512 [28554] build: Undefined generate-md5
513 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
515 [28607] nptl: Masked signals are delivered on thread exit
516 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
517 lack of cpu counting /proc fallback with glibc 2.34
518 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
519 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
520 [28648] dynamic-link: Running ld.so on statically linked binaries
522 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
524 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
525 [28678] nptl: nptl/tst-create1 hangs sporadically
526 [28688] dynamic-link: PT_LOAD p_align check is too strict
527 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
529 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
530 timezones generated by tzcode-2021d and later
531 [28713] math: GCC 12 miscompiles libm
532 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
533 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
534 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
535 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
536 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
537 Assertion `GL(dl_rtld_map).l_libname' failed!
538 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
539 [28757] nptl: GDB printer tests failed with new GDB
540 [28765] math: x86_64 libmvec atan2 accuracy
541 [28766] manual: Document libmvec accuracy
542 [28768] network: Buffer overflow in svcunix_create with long pathnames
544 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
546 [28770] libc: Unexpected return value from realpath() for too long
547 results (CVE-2021-3998)
548 [28771] libc: %ebx optimization macros are incompatible with .altmacro
550 [28780] build: --disable-default-pie doesn't work on static programs
551 [28782] libc: x86-64 ISA level for glibc itself is always
553 [28792] glob: possible wrong behaviour with patterns with double [
555 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
556 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
557 empty mon_decimal_point_wc
564 * In order to support smoother in-place-upgrades and to simplify
565 the implementation of the runtime all functionality formerly
566 implemented in the libraries libpthread, libdl, libutil, libanl has
567 been integrated into libc. New applications do not need to link with
568 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
569 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
570 provided, so that the linker options keep working. Applications which
571 have been linked against glibc 2.33 or earlier continue to load the
572 corresponding shared objects (which are now empty). The integration
573 of those libraries into libc means that additional symbols become
574 available by default. This can cause applications that contain weak
575 references to take unexpected code paths that would only have been
576 used in previous glibc versions when e.g. preloading libpthread.so.0,
577 potentially exposing application bugs.
579 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
580 PTHREAD_STACK_MIN is no longer constant and is redefined to
581 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
582 sets for modern architectural features like Arm SVE.
584 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
585 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
586 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
587 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
588 dynamic sized register sets for modern architectural features like
591 * The dynamic linker implements the --list-diagnostics option, printing
592 a dump of information related to IFUNC resolver operation and
593 glibc-hwcaps subdirectory selection.
595 * On Linux, the function execveat has been added. It operates similar to
596 execve and it is is already used to implement fexecve without requiring
597 /proc to be mounted. However, different than fexecve, if the syscall is not
598 supported by the kernel an error is returned instead of trying a fallback.
600 * The ISO C2X function timespec_getres has been added.
602 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
603 C2X, is supported to enable declarations of functions defined in Annex F
604 of C2X. Those declarations are also enabled when
605 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
606 defined, and when _GNU_SOURCE is defined.
608 * On powerpc64*, glibc can now be compiled without scv support using the
609 --disable-scv configure option.
611 * Add support for 64-bit time_t on configurations like x86 where time_t
612 is traditionally 32-bit. Although time_t still defaults to 32-bit on
613 these configurations, this default may change in future versions.
614 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
615 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
616 only enabled for Linux and the full support requires a minimum kernel
619 * The main gconv-modules file in glibc now contains only a small set of
620 essential converter modules and the rest have been moved into a supplementary
621 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
622 in the same GCONV_PATH. Similarly, external converter modules directories
623 may have supplementary configuration files in a gconv-modules.d directory
624 with names ending with .conf to logically classify the converter modules in
627 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
628 to configure the size of the thread stack cache.
630 * The function _Fork has been added as an async-signal-safe fork replacement
631 since Austin Group issue 62 droped the async-signal-safe requirement for
632 fork (and it will be included in the future POSIX standard). The new _Fork
633 function does not run any atfork function neither resets any internal state
634 or lock (such as the malloc one), and only sets up a minimal state required
635 to call async-signal-safe functions (such as raise or execve). This function
636 is currently a GNU extension.
638 * On Linux, the close_range function has been added. It allows efficiently
639 closing a range of file descriptors on recent kernels (version 5.9).
641 * The function closefrom has been added. It closes all file descriptors
642 greater than or equal to a given integer. This function is a GNU extension,
643 although it is also present in other systems.
645 * The posix_spawn_file_actions_addclosefrom_np function has been added,
646 enabling posix_spawn and posix_spawnp to close all file descriptors greater
647 than or equal to a given integer. This function is a GNU extension,
648 although Solaris also provides a similar function.
650 * When invoked explicitly, the dynamic linker now uses the kernel to
651 execute programs that do not have any dynamic dependency (that is,
652 they are statically linked). This feature is Linux-specific.
654 Deprecated and removed features, and other changes affecting compatibility:
656 * The function pthread_mutex_consistent_np has been deprecated; programs
657 should use the equivalent standard function pthread_mutex_consistent
660 * The function pthread_mutexattr_getrobust_np has been deprecated;
661 programs should use the equivalent standard function
662 pthread_mutexattr_getrobust instead.
664 * The function pthread_mutexattr_setrobust_np has been deprecated;
665 programs should use the equivalent standard function
666 pthread_mutexattr_setrobust instead.
668 * The function pthread_yield has been deprecated; programs should use
669 the equivalent standard function sched_yield instead.
671 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
673 * Various rarely-used functions declared in <resolv.h> and
674 <arpa/nameser.h> have been deprecated. Applications are encouraged to
675 use dedicated DNS processing libraries if applicable. For <resolv.h>,
676 this affects the functions dn_count_labels, fp_nquery, fp_query,
677 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
678 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
679 p_type, putlong, putshort, res_hostalias, res_isourserver,
680 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
681 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
682 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
683 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
685 * Various symbols previously defined in libresolv have been moved to libc
686 in order to prepare for libresolv moving entirely into libc (see earlier
687 entry for merging libraries into libc). The symbols __dn_comp,
688 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
689 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
690 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
691 __res_search, __res_send formerly in libresolv have been renamed and no
692 longer have a __ prefix. They are now available in libc.
694 * The pthread cancellation handler is now installed with SA_RESTART and
695 pthread_cancel will always send the internal SIGCANCEL on a cancellation
696 request. It should not be visible to applications since the cancellation
697 handler should either act upon cancellation (if asynchronous cancellation
698 is enabled) or ignore the cancellation internal signal. However there are
699 buggy kernel interfaces (for instance some CIFS versions) that could still
700 see a spurious EINTR error when cancellation interrupts a blocking syscall.
702 * Previously, glibc installed its various shared objects under versioned
703 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
704 were provided as symbolic links. Starting with glibc 2.34, the shared
705 objects are installed under their ABI sonames directly, without
706 symbolic links. This increases compatibility with distribution
707 package managers that delete removed files late during the package
708 upgrade or downgrade process.
710 * The symbols mallwatch and tr_break are now deprecated and no longer used in
711 mtrace. Similar functionality can be achieved by using conditional
712 breakpoints within mtrace functions from within gdb.
714 * The __morecore and __after_morecore_hook malloc hooks and the default
715 implementation __default_morecore have been removed from the API. Existing
716 applications will continue to link against these symbols but the interfaces
717 no longer have any effect on malloc.
719 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
720 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
721 disabled by default in the main C library. Users looking to use these
722 features now need to preload a new debugging DSO libc_malloc_debug.so to get
723 this functionality back.
725 * The deprecated functions malloc_get_state and malloc_set_state have been
726 moved from the core C library into libc_malloc_debug.so. Legacy applications
727 that still use these functions will now need to preload libc_malloc_debug.so
728 in their environment using the LD_PRELOAD environment variable.
730 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
731 __memalign_hook and __free_hook are now removed from the API. Compatibility
732 symbols are present to support legacy programs but new applications can no
733 longer link to these symbols. These hooks no longer have any effect on glibc
734 functionality. The malloc debugging DSO libc_malloc_debug.so currently
735 supports hooks and can be preloaded to get this functionality back for older
736 programs. However this is a transitional measure and may be removed in a
737 future release of the GNU C Library. Users may port away from these hooks by
738 writing and preloading their own malloc interposition library.
740 Changes to build and runtime requirements:
742 * On Linux, the shm_open, sem_open, and related functions now expect the
743 file shared memory file system to be mounted at /dev/shm. These functions
744 no longer search among the system's mount points for a suitable
745 replacement if /dev/shm is not available.
747 Security related changes:
749 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
750 a request for netgroup lookup, may crash due to a double-free,
751 potentially resulting in degraded service or Denial of Service on the
752 local system. Reported by Chris Schanzle.
754 CVE-2021-33574: The mq_notify function has a potential use-after-free
755 issue when using a notification type of SIGEV_THREAD and a thread
756 attribute with a non-default affinity mask.
758 CVE-2021-35942: The wordexp function may overflow the positional
759 parameter number when processing the expansion resulting in a crash.
760 Reported by Philippe Antoine.
762 The following bugs are resolved with this release:
764 [4737] libc: fork is not async-signal-safe
765 [5781] math: Slow dbl-64 sin/cos/sincos for special values
766 [10353] libc: Methods for deleting all file descriptors greater than
767 given integer (closefrom)
768 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
769 name containing multi-byte character(s)
770 [14469] math: Inaccurate j0f function
771 [14470] math: Inaccurate j1f function
772 [14471] math: Inaccurate y0f function
773 [14472] math: Inaccurate y1f function
774 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
776 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
777 crashes if it fails dlsym() twice
778 [15648] nptl: multiple definition of `__lll_lock_wait_private'
779 [16063] nptl: Provide a pthread_once variant in libc directly
780 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
781 [17145] libc: syslog with LOG_CONS leaks console file descriptor
782 [17183] manual: description of ENTRY struct in <search.h> in glibc
784 [18435] nptl: pthread_once hangs when init routine throws an exception
785 [18524] nptl: Missing calloc error checking in
786 __cxa_thread_atexit_impl
787 [19329] dynamic-link: dl-tls.c assert failure at concurrent
788 pthread_create and dlopen
789 [19366] nptl: returning from a thread should disable cancellation
790 [19511] nptl: 8MB memory leak in pthread_create in case of failure
791 when non-root user changes priority
792 [20802] dynamic-link: getauxval NULL pointer dereference after static
794 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
795 [22057] malloc: malloc_usable_size is broken with mcheck
796 [22668] locale: LC_COLLATE: the last character of ellipsis is not
798 [23323] libc: [RFE] CSU startup hardening.
799 [23328] malloc: Remove malloc hooks and ensure related APIs return no
801 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
802 $PLATFORM, $ORIGIN) crashes
803 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
804 [23554] nptl: pthread_getattr_np reports wrong stack size with
806 [24106] libc: Bash interpreter in ldd script is taken from host
807 [24773] dynamic-link: dlerror in an secondary namespace does not use
808 the right free implementation
809 [25036] localedata: Update collation order for Swedish
810 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
811 shm_open to pick wrong directory
812 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
813 crash in IFUNC resolver due to stack canary (--enable-stack-
815 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
816 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
817 [27111] dynamic-link: pthread_create and tls access use link_map
818 objects that may be concurrently freed by dlclose
819 [27132] malloc: memusagestat is linked to system librt, leading to
820 undefined symbols on major version upgrade
821 [27136] dynamic-link: dtv setup at thread creation may leave an entry
823 [27249] libc: libSegFault.so does not output signal number properly
824 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
826 [27318] dynamic-link: glibc fails to load binaries when built with
827 -march=sandybridge: CPU ISA level is lower than required
828 [27343] nss: initgroups() SIGSEGVs when called on a system without
829 nsswich.conf (in a chroot)
830 [27346] dynamic-link: x86: PTWRITE feature check is missing
831 [27389] network: NSS chroot hardening causes regressions in chroot
833 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
834 [27444] libc: sysconf reports unsupported option (-1) for
835 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
836 [27462] nscd: double-free in nscd (CVE-2021-27645)
837 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
838 malloc/tst-malloc-thread-fail
839 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
840 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
842 [27522] glob: glob, glob64 incorrectly marked as __THROW
843 [27555] dynamic-link: Static tests fail with --enable-stack-
845 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
846 information for the current directory
847 [27577] dynamic-link: elf/ld.so --help doesn't work
848 [27605] libc: tunables can't control xsave/xsavec selection in
850 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
851 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
853 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
854 _nss_files_getcanonname_r) from within a dlmopen namespace.
855 [27648] libc: FAIL: misc/tst-select
856 [27650] stdio: vfscanf returns too early if a match is longer than
858 [27651] libc: Performance regression after updating to 2.33
859 [27655] string: Wrong size calculation in string/test-strnlen.c
860 [27706] libc: select fails to update timeout on error
861 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
862 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
863 tries resolving them lazily
864 [27744] nptl: Support different libpthread/ld.so load orders in
866 [27749] libc: Data race __run_exit_handlers
867 [27761] libc: getconf: Segmentation fault when passing '-vq' as
869 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
870 exceeds maximum object size 2147483647
871 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
873 [27872] build: Obsolete configure option --enable-stackguard-
875 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
876 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
877 [27892] libc: powerpc: scv ABI error handling fails to check
879 [27896] nptl: mq_notify does not handle separately allocated thread
880 attributes (CVE-2021-33574)
881 [27901] libc: TEST_STACK_ALIGN doesn't work
882 [27902] libc: The x86-64 clone wrapper fails to align child stack
883 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
884 [27939] libc: aarch64: clone does not align the stack
885 [27968] libc: s390x: clone does not align the stack
886 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
887 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
889 [28028] malloc: malloc: tcache shutdown sequence does not work if the
890 thread never allocated anything
891 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
892 [28064] string: x86_64:wcslen implementation list has wcsnlen
893 [28067] libc: FAIL: posix/tst-spawn5
894 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
895 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
897 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
898 [28089] build: tst-tls20 fails when linker defaults to --as-needed
899 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
901 [28091] network: ns_name_skip may return 0 for domain names without
909 * The dynamic linker accepts the --list-tunables argument which prints
910 all the supported tunables. This option is disable if glibc is
911 configured with tunables disabled (--enable-tunables=no).
913 * The dynamic linker accepts the --argv0 argument and provides opportunity
914 to change argv[0] string.
916 * The dynamic linker loads optimized implementations of shared objects
917 from subdirectories under the glibc-hwcaps directory on the library
918 search path if the system's capabilities meet the requirements for
919 that subdirectory. Initially supported subdirectories include
920 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
921 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
922 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
923 subdirectory names correspond to the vendor-independent x86-64
924 microarchitecture levels defined in the x86-64 psABI supplement.
926 * The new --help option of the dynamic linker provides usage and
927 information and library search path diagnostics.
929 * The mallinfo2 function is added to report statistics as per mallinfo,
930 but with larger field widths to accurately report values that are
931 larger than fit in an integer.
933 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
935 * Support for the RISC-V ISA running on Linux has been expanded to run on
936 32-bit hardware. This is supported for the following ISA and ABI pairs:
942 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
945 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
946 glibc may use additional checks that may have an additional performance
947 overhead. At present these checks are available only on LLVM 9 and later.
948 The latest GCC available at this time (10.2) does not support this level of
951 Deprecated and removed features, and other changes affecting compatibility:
953 * The mallinfo function is marked deprecated. Callers should call
956 * When dlopen is used in statically linked programs, alternative library
957 implementations from HWCAP subdirectories are no longer loaded.
958 Instead, the default implementation is used.
960 * The deprecated <sys/vtimes.h> header and the function vtimes have been
961 removed. To support old binaries, the vtimes function continues to exist
962 as a compatibility symbol. Applications should use the getrlimit or
965 * Following a change in the tzdata 2018a release upstream, the zdump
966 program is now installed in the /usr/bin subdirectory. Previously,
967 the /usr/sbin subdirectory was used.
969 * On s390(x), the type float_t is now derived from the macro
970 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
971 hardcoded to double. This does not affect the ABI of any libraries
972 that are part of the GNU C Library, but may affect the ABI of other
973 libraries that use this type in their interfaces. The new definition
974 improves consistency with compiler behavior in many scenarios.
976 * A future version of glibc will stop loading shared objects from the
977 "tls" subdirectories on the library search path, the subdirectory that
978 corresponds to the AT_PLATFORM system name, and also stop employing
979 the legacy AT_HWCAP search mechanism. Applications should switch to
980 the new glibc-hwcaps mechanism instead; if they do not do that, only
981 the baseline version (directly from the search path directory) will be
984 Changes to build and runtime requirements:
986 * On Linux, the system administrator needs to configure /dev/pts with
987 the intended access modes for pseudo-terminals. glibc no longer
988 attemps to adjust permissions of terminal devices. The previous glibc
989 defaults ("tty" group, user read/write and group write) already
990 corresponded to what most systems used, so that grantpt did not
991 perform any adjustments.
993 * On Linux, the posix_openpt and getpt functions no longer attempt to
994 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
995 (and pseudo-terminals are supported), a devpts file system is mounted
996 on /dev/pts. Current systems already meet these requirements.
998 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1000 Security related changes:
1002 CVE-2021-3326: An assertion failure during conversion from the
1003 ISO-20220-JP-3 character set using the iconv function has been fixed.
1004 This assertion was triggered by certain valid inputs in which the
1005 converted output contains a combined sequence of two wide characters
1006 crossing a buffer boundary. Reported by Tavis Ormandy.
1008 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1009 invoked with input containing redundant shift sequences in the IBM1364,
1010 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1012 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1013 when invoked with UCS4 input containing an invalid character.
1015 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1016 invoked with EUC-KR input containing invalid multibyte input sequences.
1018 The following bugs are resolved with this release:
1020 [10635] libc: realpath portability patches
1021 [16124] dynamic-link: ld.so should allow to change argv[0]
1022 [17924] malloc: 'free' should not set errno
1023 [18683] libc: Linux faccessat implementation can incorrectly ignore
1025 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1026 [23091] hurd: missing waitid support
1027 [23249] libc: Epyc and other current AMD CPUs do not select the
1028 "haswell" platform subdirectory
1029 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1031 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1033 [24941] libc: Make grantpt usable after multi-threaded fork in more
1035 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1036 [24973] locale: iconv encounters segmentation fault when converting
1037 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1038 [25399] string: undefined reference to `__warn_memset_zero_len' when
1039 changing gnuc version
1040 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1042 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1044 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1045 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1046 [26100] libc: Race in syslog(3) with regards to tag printing.
1047 [26124] libc: Export <cpu-features.h>
1048 [26130] nscd: Inconsistent nscd cache during pruning
1049 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1050 [26224] locale: iconv hangs when converting some invalid inputs from
1051 several IBM character sets (CVE-2020-27618)
1052 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1053 too much stack space
1054 [26343] manual: invalid documented return type for strerrorname_np(),
1055 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1056 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1058 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1060 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1061 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1063 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1064 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1065 [26555] string: strerrorname_np does not return the documented value
1066 [26592] libc: pointer arithmetic overflows in realpath
1067 [26600] network: Transaction ID collisions cause slow DNS lookups in
1069 [26606] libc: [2.33 Regression] pselect is broken on x32
1070 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1071 [26620] glob: fnmatch with collating symbols results in segmentation
1073 [26625] libc: [2.33 Regression] CET is disabled
1074 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1075 at the end of a memory mapping
1076 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1077 by the caller to the kernel
1078 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1079 [26647] build: [-Werror=array-parameter=] due to different
1080 declarations for __sigsetjmp
1081 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1083 [26649] stdio: printf should handle non-normal x86 long double numbers
1084 gracefully (CVE-2020-29573)
1085 [26686] build: -Warray-parameter instances building with GCC 11
1086 [26687] build: -Warray-bounds instances building with GCC 11
1087 [26690] stdio: Aliasing violation in __vfscanf_internal
1088 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1089 [26726] build: GCC warning calling new_composite_name with an array of
1091 [26736] libc: FAIL: misc/tst-sysvshm-linux
1092 [26737] libc: Random FAIL: rt/tst-shm
1093 [26791] libc: Missing O_CLOEXEC in sysconf.c
1094 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1096 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1098 [26818] string: aarch64: string tests may run ifunc variants that are
1100 [26821] libc: Memory leak test failures on Fedora 33
1101 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1102 FSGSBASE/LM/RDRAND check failure
1103 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1105 [26853] libc: aarch64: Missing unwind information in statically linked
1107 [26923] locale: Assertion failure in iconv when converting invalid
1108 UCS4 (CVE-2020-29562)
1109 [26926] dynamic-link: aarch64: library dependencies are not bti
1111 [26932] libc: sh: Multiple floating point functions defined as stubs
1113 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1115 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1117 [27002] build: libc_freeres_fn build failure with GCC 11
1118 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1119 [27008] dynamic-link: ld.so.cache should have endianness markup
1120 [27042] libc: [alpha] anonymous union in struct stat confuses
1122 [27053] libc: Conformance regression in system(3) (and probably also
1124 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1126 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1127 [27083] libc: Unsafe unbounded alloca in addmntent
1128 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1130 [27130] string: "rep movsb" performance issue
1131 [27150] libc: alpha: wait4() is unavailable in static linking
1132 [27177] dynamic-link:
1133 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1135 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1136 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1137 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1138 related to combining characters (CVE-2021-3326)
1145 * Unicode 13.0.0 Support: Character encoding, character type info, and
1146 transliteration tables are all updated to Unicode 13.0.0, using
1147 generator scripts contributed by Mike FABIAN (Red Hat).
1149 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1151 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1152 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1153 Three ABIs are supported:
1159 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1160 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1162 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1163 DT_DEPAUDIT dynamic section entries of the main executable.
1165 * powerpc64le supports IEEE128 long double libm/libc redirects when
1166 using -mabi=ieeelongdouble to compile C code on supported GCC
1167 toolchains. It is recommended to use GCC 8 or newer when testing
1170 * To help detect buffer overflows and other out-of-bounds accesses
1171 several APIs have been annotated with GCC 'access' attribute. This
1172 should help GCC 10 issue better warnings.
1174 * On Linux, functions pthread_attr_setsigmask_np and
1175 pthread_attr_getsigmask_np have been added. They allow applications
1176 to specify the signal mask of a thread created with pthread_create.
1178 * The GNU C Library now provides the header file <sys/single_threaded.h>
1179 which declares the variable __libc_single_threaded. Applications are
1180 encouraged to use this variable for single-thread optimizations,
1181 instead of weak references to symbols historically defined in
1184 * The functions sigabbrev_np and sigdescr_np have been added. The
1185 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1186 SIGHUP) while sigdescr_np returns a string describing the signal number
1187 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1188 attempt to translate the return description, both functions return
1189 NULL for an invalid signal number.
1191 They should be used instead of sys_siglist or sys_sigabbrev and they
1192 are both thread and async-signal safe. These functions are GNU extensions.
1194 * The functions strerrorname_np and strerrordesc_np have been added. The
1195 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1196 while strerrordesc_np returns a string describing the error number
1197 (e.g "Invalid argument" for EINVAL). Different than strerror,
1198 strerrordesc_np does not attempt to translate the return description, both
1199 functions return NULL for an invalid error number.
1201 They should be used instead of sys_errlist and sys_nerr, both are
1202 thread and async-signal safe. These functions are GNU extensions.
1204 * AArch64 now supports standard branch protection security hardening
1205 in glibc when it is built with a GCC that is configured with
1206 --enable-standard-branch-protection (or if -mbranch-protection=standard
1207 flag is passed when building both GCC target libraries and glibc,
1208 in either case a custom GCC is needed). This includes branch target
1209 identification (BTI) and pointer authentication for return addresses
1210 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1211 extensions respectively for the protection to be effective,
1212 otherwise the used instructions are nops. User code can use PAC-RET
1213 without libc support, but BTI requires a libc that is built with BTI
1214 support, otherwise runtime objects linked into user code will not be
1217 Deprecated and removed features, and other changes affecting compatibility:
1219 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1220 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1221 RPC header files. Backward compatibility for old programs is kept
1222 only for architectures and ABIs that have been added in or before
1223 glibc 2.31. New programs need to use TI-RPC
1224 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1225 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1227 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1228 as shared library for backward compatibility and the NSS modules "nis"
1229 and "nisplus" are not built at all and libnsl's headers aren't
1230 installed. This compatibility is kept only for architectures and ABIs
1231 that have been added in or before version 2.28. Replacement
1232 implementations based on TI-RPC, which additionally support IPv6, are
1233 available from <https://github.com/thkukuk/>. This change does not
1234 affect the "compat" NSS module, which does not depend on libnsl
1235 since 2.27 and thus can be used without NIS.
1237 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1238 removed. To support old binaries, the sysctl function continues to
1239 exist as a compatibility symbol (on those architectures which had it),
1240 but always fails with ENOSYS. This reflects the removal of the system
1241 call from all architectures, starting with Linux 5.5.
1243 * The sstk function is no longer available to newly linked binaries.
1244 Its implementation always returned with a failure, and the function
1245 was not declared in any header file.
1247 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1248 sigrelse, sigignore and sigset, and the sigmask macro have been
1249 deprecated. Applications should use the sigsuspend, sigprocmask and
1250 sigaction functions instead.
1252 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1253 already supported this format for almost 20 years.
1255 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1256 are no longer available to newly linked binaries, and their declarations
1257 have been removed from <string.h>. They are exported solely as
1258 compatibility symbols to support old binaries. All programs should use
1261 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1262 are no longer available to newly linked binaries, and their declarations
1263 have been removed from <stdio.h>. They are exported solely as
1264 compatibility symbols to support old binaries. All programs should use
1265 strerror or strerror_r instead.
1267 * Both strerror and strerror_l now share the same internal buffer in the
1268 calling thread, meaning that the returned string pointer may be invalided
1269 or contents might be overwritten on subsequent calls in the same thread or
1270 if the thread is terminated. It makes strerror MT-safe.
1272 * Using weak references to libpthread functions such as pthread_create
1273 or pthread_key_create to detect the singled-threaded nature of a
1274 program is an obsolescent feature. Future versions of glibc will
1275 define pthread_create within libc.so.6 itself, so such checks will
1276 always flag the program as multi-threaded. Applications should check
1277 the __libc_single_threaded variable declared in
1278 <sys/single_threaded.h> instead.
1280 * The "files" NSS module no longer supports the "key" database (used for
1281 secure RPC). The contents of the /etc/publickey file will be ignored,
1282 regardless of the settings in /etc/nsswitch.conf. (This method of
1283 storing RPC keys only supported the obsolete and insecure AUTH_DES
1284 flavor of secure RPC.)
1286 * The __morecore and __after_morecore_hook malloc hooks and the default
1287 implementation __default_morecore have been deprecated. Applications
1288 should use malloc interposition to change malloc behavior, and mmap to
1289 allocate anonymous memory. A future version of glibc may require that
1290 applications which use the malloc hooks must preload a special shared
1291 object, to enable the hooks.
1293 * The hesiod NSS module has been deprecated and will be removed in a
1294 future version of glibc. System administrators are encouraged to
1295 switch to other approaches for networked account databases, such as
1298 Changes to build and runtime requirements:
1300 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1301 long double redirects.
1303 Security related changes:
1305 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1306 invoked with the -c option and when processing invalid multi-byte input
1307 sequences. Reported by Jan Engelhardt.
1309 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1310 corruption when they were passed a pseudo-zero argument. Reported by Guido
1311 Vranken / ForAllSecure Mayhem.
1313 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1314 expanding ~user has been fixed.
1316 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1317 memmove functions has been fixed. Discovered by Jason Royes and Samual
1318 Dytrych of the Cisco Security Assessment and Penetration Team (See
1321 The following bugs are resolved with this release:
1323 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1324 [10441] manual: Backtraces code example lacks error checking
1325 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1326 timer_sigev_thread dangerous
1327 [14231] stdio: stdio-common tests memory requirements
1328 [14578] libc: /proc-based emulation for lchmod, fchmodat
1329 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1330 filtee has constructor
1331 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1332 sequences (CVE-2016-10228)
1333 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1334 character entities for infinity & pi
1335 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1336 segfaults in applications
1337 [20543] libc: Please move from .gnu.linkonce to comdat
1338 [22489] network: gcc warns about implicit convertion in
1339 ICMP6_FILTER_SETPASS with -Wsign-conversion
1340 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1341 [23294] math: Complex _FloatN functions are redirected to the wrong
1342 function with -mlong-double-64
1343 [23296] libc: Data race in setting function descriptor during lazy
1345 [23668] dynamic-link: ldconfig: Default to the new format for
1347 [23819] hurd: hurd: Add C11 thread support
1348 [23990] build: test-container error out on failure to exec child.
1349 [23991] build: shell-container typo in run_command_array
1350 [24638] manual: Error in example of parsing a template string
1351 [24654] manual: Wrong declaration of wcschr in libc manual
1352 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1354 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1355 dynamically loaded dsos
1356 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1357 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1359 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1360 restore EAX, ECX and EDX
1361 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1362 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1363 [25420] network: Race condition in resolv_conf.c can result in caching
1364 stale configuration forever
1365 [25487] math: sinl() stack corruption from crafted input
1367 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1369 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1370 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1372 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1373 on 32 bit and old kernel
1374 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1375 [25639] localedata: Some names of days and months wrongly spelt in
1377 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1378 amount of sigset_t bytes
1379 [25691] stdio: printf: memory leak when printing long multibyte
1381 [25715] libc: system() returns wrong errors when posix_spawn fails
1382 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1383 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1384 state for conversions that produce two Unicode code points
1385 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1386 for linux x86_64 leads to livelock
1387 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1388 test failures, invalid instruction in ld.so
1389 [25790] glob: Typo in tst-fnmatch.input
1390 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1392 [25819] localedata: Update locale data to Unicode 13.0.0
1393 [25824] libc: Abnormal function of strnlen in aarch64
1394 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1395 [25896] libc: Incorrect prctl
1396 [25902] libc: Bad LOADARGS_N
1397 [25905] dynamic-link: VSX registers are corrupted during PLT
1398 resolution when glibc is built with --disable-multi-arch and --with-
1400 [25933] string: Off by one error in __strncmp_avx2 when
1401 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1403 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1404 exiting detached thread
1405 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1407 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1409 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1410 [26073] math: getpayload() has wrong return value
1411 [26076] dynamic-link: dlmopen crashes after failing to load
1412 dependencies in audit mode
1413 [26120] localedata: column width of of some Korean
1414 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1415 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1416 [26133] libc: Incorrect need_arch_feature_F16C
1417 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1419 [26149] libc: PKU is usable only if OSPKE is set
1420 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1422 [26208] libc: Incorrect bit_cpu_CLFSH
1423 [26210] network: Incorrect use of hidden symbols for global sunrpc
1425 [26211] stdio: printf integer overflow calculating allocation size
1426 [26214] stdio: printf_fp double free
1427 [26215] stdio: printf_fp memory leak
1428 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1429 [26258] nss: nss_compat should not read input files with mmap
1430 [26332] string: Incorrect cache line size load causes memory
1431 corruption in memset
1438 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1439 enable features from the draft ISO C2X standard. Only some features from
1440 this draft standard are supported by the GNU C Library, and as the draft
1441 is under active development, the set of features enabled by this macro is
1442 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1443 by compiling with "gcc -std=gnu2x".
1445 * The <math.h> functions that round their results to a narrower type now
1446 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1447 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1448 Clarification Request 13 to TS 18661-3.
1450 * The function pthread_clockjoin_np has been added, enabling join with a
1451 terminated thread with a specific clock. It allows waiting against
1452 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1454 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1456 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1457 in queries if the trust-ad option is set via the options directive in
1458 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1459 mode, the AD bit, as provided by the name server, is available to
1460 applications which call res_search and related functions. In the default
1461 mode, the AD bit is not set in queries, and it is automatically cleared in
1462 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1463 servers and the network path to them are treated as untrusted.)
1465 Deprecated and removed features, and other changes affecting compatibility:
1467 * The totalorder and totalordermag functions, and the corresponding
1468 functions for other floating-point types, now take pointer arguments to
1469 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1470 passing. This is in accordance with the resolution of Clarification
1471 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1472 floating-point arguments directly will continue to work.
1474 * The obsolete function stime is no longer available to newly linked
1475 binaries, and its declaration has been removed from <time.h>.
1476 Programs that set the system time should use clock_settime instead.
1478 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1479 in a future version of glibc. In this release, the header still exists
1480 but calling ftime will cause a compiler warning. All programs should use
1481 gettimeofday or clock_gettime instead.
1483 * The gettimeofday function no longer reports information about a
1484 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1485 many years, as it cannot handle the full complexity of the world's
1486 timezones, but hitherto we have supported it on a best-effort basis.
1487 Changes required to support 64-bit time_t on 32-bit architectures have
1488 made this no longer practical.
1490 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1491 should expect to receive a 'struct timezone' whose tz_minuteswest and
1492 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1493 happen on a few Linux-based ports. This will be corrected in a future
1496 All callers should supply a null pointer for the 'tzp' argument to
1497 gettimeofday. For accurate information about the time zone associated
1498 with the current time, use the localtime function.
1500 gettimeofday itself is obsolescent according to POSIX. We have no plans
1501 to remove access to this function, but portable programs should consider
1502 using clock_gettime instead.
1504 * The settimeofday function can still be used to set a system-wide time
1505 zone when the operating system supports it. This is because the Linux
1506 kernel reused the API, on some architectures, to describe a system-wide
1507 time-zone-like offset between the software clock maintained by the kernel,
1508 and the "RTC" clock that keeps time when the system is shut down.
1510 However, to reduce the odds of this offset being set by accident,
1511 settimeofday can no longer be used to set the time and the offset
1512 simultaneously. If both of its two arguments are non-null, the call
1513 will fail (setting errno to EINVAL).
1515 Callers attempting to set this offset should also be prepared for the call
1516 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1517 some Linux architectures. The Linux kernel maintainers are discussing a
1518 more principled replacement for the reused API. After a replacement
1519 becomes available, we will change settimeofday to fail with ENOSYS on all
1520 platforms when its 'tzp' argument is not a null pointer.
1522 settimeofday itself is obsolescent according to POSIX. Programs that set
1523 the system time should use clock_settime and/or the adjtime family of
1524 functions instead. We may cease to make settimeofday available to newly
1525 linked binaries after there is a replacement for Linux's time-zone-like
1528 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1529 the optional CAS instruction is implemented (for instance, LEON processors
1530 are still supported, but SuperSPARC processors are not).
1532 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1535 * If a lazy binding failure happens during dlopen, during the execution of
1536 an ELF constructor, the process is now terminated. Previously, the
1537 dynamic loader would return NULL from dlopen, with the lazy binding error
1538 captured in a dlerror message. In general, this is unsafe because
1539 resetting the stack in an arbitrary function call is not possible.
1541 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1542 executable stack unless explicitly configured at build time to require
1543 minimum kernel version 4.8 or newer. This is because executing
1544 floating-point branches on a non-executable stack on Linux kernels prior to
1545 4.8 can lead to application crashes for some MIPS configurations. While
1546 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1547 expected to enable non-executable stack by default with PT_GNU_STACK by
1548 default and is thus likely to trigger a crash on older kernels.
1550 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1551 non-executable stack while dropping support for older kernels.
1553 * System call wrappers for time system calls now use the new time64 system
1554 calls when available. On 32-bit targets, these wrappers attempt to call
1555 the new system calls first and fall back to the older 32-bit time system
1556 calls if they are not present. This may cause issues in environments
1557 that cannot handle unsupported system calls gracefully by returning
1558 -ENOSYS. Seccomp sandboxes are affected by this issue.
1560 Changes to build and runtime requirements:
1562 * It is no longer necessary to have recent Linux kernel headers to build
1563 working (non-stub) system call wrappers on all architectures except 64-bit
1564 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1566 * The ChangeLog file is no longer present in the toplevel directory of the
1567 source tree. ChangeLog files are located in the ChangeLog.old directory as
1568 ChangeLog.N where the highest N has the latest entries.
1570 Security related changes:
1572 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1573 out-of-bounds write when executed in a signal frame context.
1575 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1576 environment variable during program execution after a security
1577 transition, allowing local attackers to restrict the possible mapping
1578 addresses for loaded libraries and thus bypass ASLR for a setuid
1579 program. Reported by Marcin Kościelnicki.
1581 The following bugs are resolved with this release:
1583 [12031] localedata: iconv -t ascii//translit with Greek characters
1584 [15813] libc: Multiple issues in __gen_tempname
1585 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1586 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1587 [19767] libc: vdso is not used with static linking
1588 [19903] hurd: Shared mappings not being inherited by children processes
1589 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1590 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1592 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1593 Symbols-A/B Unicode blocks
1594 [23518] libc: Eliminate __libc_utmp_jump_table
1595 [24026] malloc: malloc_info() returns wrong numbers
1596 [24054] localedata: Many locales are missing date_fmt
1597 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1598 [24304] dynamic-link: Lazy binding failure during ELF
1599 constructors/destructors is not fatal
1600 [24376] libc: RISC-V symbol size confusion with _start
1601 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1603 [24824] libc: test-in-container does not install charmap files compatible
1605 [24844] regex: regex bad pointer / leakage if malloc fails
1606 [24867] malloc: Unintended malloc_info formatting changes
1607 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1608 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1609 [24882] libc: login: pututline uses potentially outdated cache
1610 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1611 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1613 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1615 [24930] dynamic-link: dlopen of PIE executable can result in
1616 _dl_allocate_tls_init assertion failure
1617 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1618 (stringop-overflow error)
1619 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1620 functions other can lead to crashes
1621 [24967] libc: jemalloc static linking causes runtime failure
1622 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1624 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1625 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1626 [25097] libc: new -Warray-bounds with GCC 10
1627 [25112] dynamic-link: dlopen must not make new objects accessible when it
1628 still can fail with an error
1629 [25139] localedata: Please add the new mnw_MM locale
1630 [25149] regex: Array bounds violation in proceed_next_node
1631 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1632 initialized correctly
1633 [25189] libc: glibc's __glibc_has_include causes issues with clang
1635 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1636 value to an unsigned
1637 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1638 binaries (CVE-2019-19126)
1639 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1641 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1643 [25232] string: <string.h> does not enable const correctness for strchr et
1645 [25233] localedata: Consider "." as the thousands separator for sl_SI
1647 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1648 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1649 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1651 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1652 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1654 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1655 (dl_initfirst) link map pointer
1656 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1657 [25423] libc: Array overflow in backtrace on powerpc
1658 [25425] network: Missing call to __resolv_context_put in
1659 getaddrinfo.c:gethosts
1666 * Unicode 12.1.0 Support: Character encoding, character type info, and
1667 transliteration tables are all updated to Unicode 12.1.0, using
1668 generator scripts contributed by Mike FABIAN (Red Hat).
1670 * The dynamic linker accepts the --preload argument to preload shared
1671 objects, in addition to the LD_PRELOAD environment variable.
1673 * The twalk_r function has been added. It is similar to the existing
1674 twalk function, but it passes an additional caller-supplied argument
1675 to the callback function.
1677 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1679 * Minguo (Republic of China) calendar support has been added as an
1680 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1683 * The entry for the new Japanese era has been added for ja_JP locale.
1685 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1686 pvalloc, memalign, and posix_memalign fail now with total object size
1687 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1688 pointer subtraction within the allocated object, where results might
1689 overflow the ptrdiff_t type.
1691 * The dynamic linker no longer refuses to load objects which reference
1692 versioned symbols whose implementation has moved to a different soname
1693 since the object has been linked. The old error message, symbol
1694 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1695 link time reference, is gone.
1697 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1698 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1699 functions. These behave similarly to their "timed" equivalents, but also
1700 accept a clockid_t parameter to determine which clock their timeout should
1701 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1702 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1703 time of the wait (unlike with pthread_condattr_setclock, which requires
1704 the clock choice at initialization time).
1706 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1707 work, new resolvers can use a second argument which can be extended in
1708 the future, currently it contains the AT_HWCAP2 value.
1710 Deprecated and removed features, and other changes affecting compatibility:
1712 * The copy_file_range function fails with ENOSYS if the kernel does not
1713 support the system call of the same name. Previously, user space
1714 emulation was performed, but its behavior did not match the kernel
1715 behavior, which was deemed too confusing. Applications which use the
1716 copy_file_range function can no longer rely on glibc to provide a fallback
1717 on kernels that do not support the copy_file_range system call, and if
1718 this function returns ENOSYS, they will need to use their own fallback.
1719 Support for copy_file_range for most architectures was added in version
1720 4.5 of the mainline Linux kernel.
1722 * The functions clock_gettime, clock_getres, clock_settime,
1723 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1724 for new applications (on architectures which had them). Instead, the
1725 definitions in libc will be used automatically, which have been available
1728 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1729 and <sys/stropts.h> have been removed.
1731 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1732 resolver flag (deprecated in glibc 2.25) have been removed.
1734 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1735 resolver have been removed from <resolv.h>.
1737 * With --enable-bind-now, installed programs are now linked with the
1740 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1741 configurations) has been removed, following the deprecation of this
1742 subarchitecture in version 8 of GCC, and its removal in version 9.
1744 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1745 header have been removed.
1747 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1748 deprecated and will be removed from a future version of glibc.
1749 Application should directly access /proc instead. For obtaining random
1750 bits, the getentropy function can be used.
1752 Changes to build and runtime requirements:
1754 * GCC 6.2 or later is required to build the GNU C Library.
1756 Older GCC versions and non-GNU compilers are still supported when
1757 compiling programs that use the GNU C Library.
1759 Security related changes:
1761 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1762 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1763 has undefined behavior. On x32, the size_t argument may be passed
1764 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1765 32 bits. When it happened with the sign bit of RDX register set,
1766 memcmp gave the wrong result since it treated the size argument as
1767 zero. Reported by H.J. Lu.
1769 CVE-2019-9169: Attempted case-insensitive regular-expression match
1770 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1771 over-read. Reported by Hongxu Chen.
1773 The following bugs are resolved with this release:
1775 [2872] locale: Transliteration Cyrillic -> ASCII fails
1776 [6399] libc: gettid() should have a wrapper
1777 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1778 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1779 [17396] localedata: globbing for locale by [[.collating-element.]]
1780 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1781 [18465] malloc: memusagestat is built using system C library
1782 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1783 invalid input drops valid char
1784 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1785 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1786 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1787 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1788 [23352] malloc: __malloc_check_init still defined in public header
1790 [23403] nptl: Wrong alignment of TLS variables
1791 [23501] libc: nftw() doesn't return dangling symlink's inode
1792 [23733] malloc: Check the count before calling tcache_get()
1793 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1795 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1796 [23844] nptl: pthread_rwlock_trywrlock results in hang
1797 [23983] argparse: Missing compat versions of argp_failure and argp_error
1798 for long double = double
1799 [23984] libc: Missing compat versions of err.h and error.h functions for
1800 long double = double
1801 [23996] localedata: Dutch salutations
1802 [24040] libc: riscv64: unterminated call chain in __thread_start
1803 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1805 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1806 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1808 [24114] regex: regexec buffer read overrun in "grep -i
1809 '\(\(\)*.\)*\(\)\(\)\1'"
1810 [24122] libc: Segfaults if 0 returned from la_version
1811 [24153] stdio: Some input functions do not react to stdin assignment
1812 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1813 RDX is set) (CVE-2019-7309)
1814 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1815 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1816 not the default "nor"
1817 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1818 false positives, change to modern flexible array
1819 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1820 instructions while maintaining the robust mutex list due to missing
1822 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1823 unnecessary librt dependencies
1824 [24200] localedata: Revert first_weekday removal in en_IE locale
1825 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1826 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1827 [24216] malloc: Check for large bin list corruption when inserting
1829 [24228] stdio: old x86 applications that use legacy libio crash on exit
1830 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1832 [24293] localedata: Missing Minguo calendar support for TW locales
1833 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1834 tt_RU (Tatar) locale
1835 [24307] localedata: Update locale data to Unicode 12.0.0
1836 [24323] dynamic-link: dlopen should not be able open PIE objects
1837 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1838 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1839 tt_RU (Tatar) locale
1840 [24370] localedata: Add lang_name for tt_RU locale
1841 [24372] locale: Binary locale files are not architecture independent
1842 [24394] time: strptime %Ey mis-parses final year of era
1843 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1845 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1847 [24531] malloc: Malloc tunables give tcache assertion failures
1848 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1850 [24535] localedata: Update locale data to Unicode 12.1.0
1851 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1852 kernels and break testing
1853 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1854 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1855 [-Werror=format-overflow=]
1856 [24570] libc: alpha: compat msgctl uses __IPC_64
1857 [24584] locale: Data race in __wcsmbs_clone_conv
1858 [24588] stdio: Remove codecvt vtables from libio
1859 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1861 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1862 [24632] stdio: Old binaries which use freopen with default stdio handles
1864 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1866 [24652] localedata: szl_PL spelling correction
1867 [24695] nss: nss_db: calling getpwent after endpwent crashes
1868 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1869 in /etc/nsswitch.conf
1870 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1871 [24740] libc: getdents64 type confusion
1872 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1873 always implemented in the same library
1874 [24744] libc: Remove copy_file_range emulation
1875 [24757] malloc: memusagestat is linked against system libpthread
1876 [24794] libc: Partial test suite run builds corrupt test-in-container
1884 * The getcpu wrapper function has been added, which returns the currently
1885 used CPU and NUMA node. This function is Linux-specific.
1887 * A new convenience target has been added for distribution maintainers
1888 to build and install all locales as directories with files. The new
1889 target is run by issuing the following command in your build tree:
1890 'make localedata/install-locale-files', with an optional DESTDIR
1891 to set the install root if you wish to install into a non-default
1892 configured location.
1894 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
1896 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
1897 for _GNU_SOURCE, to match BSD environments.
1899 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
1900 indicates that it will abort the transaction prior to entering the kernel
1901 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
1902 suspended, and this caused some undefined side-effects issues by aborting
1903 transactions manually. Glibc avoided it by abort transactions manually on
1904 each syscall, but it lead to performance issues on newer kernels where the
1905 HTM state is saved and restore lazily (the state being saved even when the
1906 process actually does not use HTM).
1908 * The functions posix_spawn_file_actions_addchdir_np and
1909 posix_spawn_file_actions_addfchdir_np have been added, enabling
1910 posix_spawn and posix_spawnp to run the new process in a different
1911 directory. These functions are GNU extensions. The function
1912 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
1915 * The popen and system do not run atfork handlers anymore (BZ#17490).
1916 Although it is a possible POSIX violation, the POSIX rationale in
1917 pthread_atfork documentation regarding atfork handlers is to handle
1918 inconsistent mutex state after a fork call in a multi-threaded process.
1919 In both popen and system there is no direct access to user-defined mutexes.
1921 * Support for the C-SKY ABIV2 running on Linux has been added. This port
1922 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
1924 - C-SKY ABIV2 soft-float little-endian
1925 - C-SKY ABIV2 hard-float little-endian
1927 * strftime's default formatting of a locale's alternative year (%Ey)
1928 has been changed to zero-pad the year to a minimum of two digits,
1929 like "%y". This improves the display of Japanese era years during
1930 the first nine years of a new era, and is expected to be harmless
1931 for all other locales (only Japanese locales regularly have
1932 alternative year numbers less than 10). Zero-padding can be
1933 overridden with the '_' or '-' flags (which are GNU extensions).
1935 * As a GNU extension, the '_' and '-' flags can now be applied to
1936 "%EY" to control how the year number is formatted; they have the
1937 same effect that they would on "%Ey".
1939 Deprecated and removed features, and other changes affecting compatibility:
1941 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
1942 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
1944 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
1945 in <sys/procfs.h>, has been corrected to match the type actually used by
1946 the Linux kernel. This affects the size and layout of that structure on
1947 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
1949 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
1950 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
1951 defined in <sys/procfs.h>, has been corrected to match the type actually
1952 used by the Linux kernel. This affects the size and layout of those
1955 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
1956 meant to scan a string and allocate space for it with malloc, is now
1957 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
1958 defined. This extension conflicts with C99's use of '%a' to scan a
1959 hexadecimal floating-point number, which is now available to programs
1960 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
1962 POSIX.1-2008 includes the feature of allocating a buffer for string input
1963 with malloc, using the modifier letter 'm' instead. Programs using
1964 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
1965 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
1966 C99 '%a' no longer need to avoid _GNU_SOURCE.
1968 GCC's -Wformat warnings can detect most uses of this extension, as long
1969 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
1970 __attribute__ ((format (scanf, ...))).
1972 Changes to build and runtime requirements:
1974 * Python 3.4 or later is required to build the GNU C Library.
1976 * On most architectures, GCC 5 or later is required to build the GNU C
1977 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
1979 Older GCC versions and non-GNU compilers are still supported when
1980 compiling programs that use the GNU C Library.
1982 Security related changes:
1984 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
1985 denial of service due to resource exhaustion when processing getaddrinfo
1986 calls with crafted host names. Reported by Guido Vranken.
1988 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
1989 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
1990 happened, accessing the 32-bit size_t value as the full 64-bit register
1991 in the assembly string/memory functions would cause a buffer overflow.
1992 Reported by H.J. Lu.
1994 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
1995 addresses with arbitrary trailing characters, potentially leading to data
1996 or command injection issues in applications.
1998 The following bugs are resolved with this release:
2000 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2001 [10496] localedata: 12h time representation in multiple locales faulty
2002 [10797] localedata: it_IT locale numeric does not have a separator for
2004 [11319] libc: dprintf doesn't handle errors properly
2005 [16346] time: mktime: potentially unsafe use of localtime_offset
2006 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2008 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2009 posix_spawn_file_actions_addfchdir_np
2010 [17426] localedata: Indian locales: set the correct date format
2011 [17490] stdio: popen should not invoke atfork handlers
2012 [17783] libc: TIOCSER_TEMT conditions inconsistent
2013 [18040] regex: use-after-free in regexec/get_subexp
2014 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2015 [20018] network: getaddrinfo should reject IP addresses with trailing
2016 characters (CVE-2016-10739)
2017 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2018 [20271] libc: Missing "\n" in __libc_fatal calls
2019 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2020 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2021 pointer argument is non-NULL
2022 [21037] stdio: open_memstream and freopen
2023 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2024 [21716] time: Crash in glibc's mktime in low-memory situations
2025 [22834] stdio: Subprocess forked by popen may crash in Linux when
2026 multithreads call popen
2027 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2028 and pthread_create fails.
2029 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2030 [23125] libc: riscv64: endless loop when throwing an exception from a
2032 [23275] nptl: Race in pthread_mutex_lock while promoting to
2033 PTHREAD_MUTEX_ELISION_NP.
2034 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2036 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2038 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2040 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2041 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2043 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2044 [23521] nss: get_next_alias nss_files file stream leak
2045 [23538] nptl: Hang in pthread_cond_broadcast
2046 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2047 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2048 [23579] libc: Errors misreported in preadv2
2049 [23597] build: support/test-container.c doesn't work with different
2051 [23603] time: mktime signed integer overflow on large timestamps
2052 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2053 [23614] libc: powerpc: missing CFI register information in __mpn_*
2055 [23637] string: Generic strstr/strcasestr fails with huge needles
2056 [23640] libc: no way to easily clear FD_CLOEXEC in
2057 posix_spawn_file_actions_adddup2()
2058 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2060 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2062 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2063 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2064 bits/types/struct_rusage.h
2065 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2067 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2069 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2070 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2071 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2073 [23724] localedata: Albanian date formats are incorrect
2074 [23735] math: libnldbl_nonshared.a references internal libm symbols
2075 [23740] localedata: kl_GL: Month names and date formats need update
2076 [23744] regex: regex refactorings to remove BE, avoid duplication
2077 [23745] time: mktime fix for Gnulib + coreutils
2078 [23758] time: Improve the width of alternate representation for year in
2080 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2081 [23789] time: mktime does not set errno on failure
2082 [23791] localedata: Wrong monetary format for ca_ES locale
2083 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2084 [23794] locale: c16rtomb does not handle surrogate pairs
2085 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2086 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2087 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2088 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2089 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2090 [23862] libc: [sh] missing kernel-features.h undefines
2091 [23864] libc: [riscv] missing kernel-features.h undefines
2092 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2093 [23907] malloc: Incorrect double-free malloc tcache check disregards
2095 [23913] libc: off-by-one in function maybe_script_execute in
2096 sysdeps/posix/spawni.c
2097 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2098 [23923] locale: Add --no-hard-links option to localedef
2099 [23927] network: Linux if_nametoindex() does not close descriptor
2101 [23961] math: powf can overflow to inf without setting errno in non-
2102 nearest rounding mode
2103 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2104 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2105 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2106 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2107 [24011] localedata: Fixed small type in comment for locale bs_BA
2108 [24018] libc: gettext() may return NULL
2109 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2110 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2111 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2113 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2114 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2116 [24046] localedata: en_US locale doesn't define date_fmt
2117 [24063] manual: @var{errno} should be @code{errno}
2118 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2119 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2121 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2123 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2125 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2127 [24112] network: Do not send DNS queries for non-host names (where all
2128 answers will be rejected)
2129 [24130] libc: alpha __remqu corrupts $f3 register
2136 * The localization data for ISO 14651 is updated to match the 2016
2137 Edition 4 release of the standard, this matches data provided by
2138 Unicode 9.0.0. This update introduces significant improvements to the
2139 collation of Unicode characters. This release deviates slightly from
2140 the standard in that the collation element ordering for lowercase and
2141 uppercase LATIN script characters is adjusted to ensure that regular
2142 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2143 is not matched by [a-z]. With the update many locales have been
2144 updated to take advantage of the new collation information. The new
2145 collation information has increased the size of the compiled locale
2146 archive or binary locales.
2148 * The GNU C Library can now be compiled with support for Intel CET, AKA
2149 Intel Control-flow Enforcement Technology. When the library is built
2150 with --enable-cet, the resulting glibc is protected with indirect
2151 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2152 compatible with all existing executables and shared libraries. This
2153 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2154 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2155 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2156 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2157 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2158 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2161 * The GNU C Library now has correct support for ABSOLUTE symbols
2162 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2163 relocated incorrectly or in some cases discarded. The GNU linker can
2164 make use of the newer semantics, but it must communicate it to the
2165 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2166 field) to indicate such support is required.
2168 * Unicode 11.0.0 Support: Character encoding, character type info, and
2169 transliteration tables are all updated to Unicode 11.0.0, using
2170 generator scripts contributed by Mike FABIAN (Red Hat).
2172 * <math.h> functions that round their results to a narrower type are added
2173 from TS 18661-1:2014 and TS 18661-3:2015:
2175 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2176 fMxaddfNx functions.
2178 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2179 fMxsubfNx functions.
2181 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2182 fMxmulfNx functions.
2184 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2185 fMxdivfNx functions.
2187 * Two grammatical forms of month names are now supported for the following
2188 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2189 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2190 support two grammatical forms in abbreviated month names: Catalan, Greek,
2193 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2194 include the support for two grammatical forms of month names.
2196 * Building and running on GNU/Hurd systems now works without out-of-tree
2199 * The renameat2 function has been added, a variant of the renameat function
2200 which has a flags argument. If the flags are zero, the renameat2 function
2201 acts like renameat. If the flag is not zero and there is no kernel
2202 support for renameat2, the function will fail with an errno value of
2203 EINVAL. This is different from the existing gnulib function renameatu,
2204 which performs a plain rename operation in case of a RENAME_NOREPLACE
2205 flags and a non-existing destination (and therefore has a race condition
2206 that can clobber the destination inadvertently).
2208 * The statx function has been added, a variant of the fstatat64
2209 function with an additional flags argument. If there is no direct
2210 kernel support for statx, glibc provides basic stat support based on
2211 the fstatat64 function.
2213 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2214 library if installed. libidn2 version 2.0.5 or later is recommended. If
2215 libidn2 is not available, internationalized domain names are not encoded
2216 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2217 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2218 with an encoding error.) Flags which used to change the IDN encoding and
2219 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2220 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2221 deprecated. They no longer have any effect.
2223 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2224 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2225 range of ELF gABI expressions including such constructs as
2226 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2227 have been further restricted, and where in the past a dynamic string
2228 token sequence may have been interpreted as a literal string it will
2229 now cause a load failure. These load failures were always considered
2230 unspecified behaviour from the perspective of the dynamic loader, and
2231 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2232 results in a load failure now.
2234 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2235 implementation includes all the standard functions provided by
2238 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2239 thrd_detach, thrd_exit, and thrd_join for thread management.
2241 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2242 mtx_destroy for mutual exclusion.
2244 - call_once for function call synchronization.
2246 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2247 cnd_wait for conditional variables.
2249 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2251 Application developers must link against libpthread to use ISO C threads.
2253 Deprecated and removed features, and other changes affecting compatibility:
2255 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2256 installed. Software that was using either header should be updated to
2257 use standard <stdio.h> interfaces instead.
2259 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2260 This was never required by the C standard, and the macros just expanded
2261 to call alternative names for the same functions. If you hoped getc and
2262 putc would provide performance improvements over fgetc and fputc, instead
2263 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2264 necessary, flockfile and funlockfile.
2266 * All stdio functions now treat end-of-file as a sticky condition. If you
2267 read from a file until EOF, and then the file is enlarged by another
2268 process, you must call clearerr or another function with the same effect
2269 (e.g. fseek, rewind) before you can read the additional data. This
2270 corrects a longstanding C99 conformance bug. It is most likely to affect
2271 programs that use stdio to read interactive input from a terminal.
2274 * The macros 'major', 'minor', and 'makedev' are now only available from
2275 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2276 headers that happen to include <sys/types.h>. These macros are rarely
2277 used, not part of POSIX nor XSI, and their names frequently collide with
2278 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2279 further explanation.
2281 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2282 these macros should first include <sys/types.h>, and then include
2283 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2285 * The tilegx*-*-linux-gnu configurations are no longer supported.
2287 * The obsolete function ustat is no longer available to newly linked
2288 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2289 function has been deprecated in favor of fstatfs and statfs.
2291 * The obsolete function nfsservctl is no longer available to newly linked
2292 binaries. This function was specific to systems using the Linux kernel
2293 and could not usefully be used with the GNU C Library on systems with
2294 version 3.1 or later of the Linux kernel.
2296 * The obsolete function name llseek is no longer available to newly linked
2297 binaries. This function was specific to systems using the Linux kernel
2298 and was not declared in a header. Programs should use the lseek64 name
2299 for this function instead.
2301 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2302 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2303 previously selected by them is now always enabled.
2305 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2306 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2307 restriction (rejecting '_' in host names, among other things) has been
2308 removed, for increased compatibility with non-IDN name resolution.
2310 * The fcntl function now have a Long File Support variant named fcntl64. It
2311 is added to fix some Linux Open File Description (OFD) locks usage on non
2312 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2313 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2314 locks act as a cancellation entrypoint.
2316 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2317 ecb_crypt, and des_setparity are no longer available to newly linked
2318 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2319 longer installed. These functions encrypted and decrypted data with the
2320 DES block cipher, which is no longer considered secure. Software that
2321 still uses these functions should switch to a modern cryptography library,
2324 * Reflecting the removal of the encrypt and setkey functions above, the
2325 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2326 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2329 * The obsolete function fcrypt is no longer available to newly linked
2330 binaries. It was just another name for the standard function crypt,
2331 and it has not appeared in any header file in many years.
2333 * We have tentative plans to hand off maintenance of the passphrase-hashing
2334 library, libcrypt, to a separate development project that will, we hope,
2335 keep up better with new passphrase-hashing algorithms. We will continue
2336 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2337 'crypt_r' should not need to change at all; however, distributions will
2338 need to install <crypt.h> and libcrypt from a separate project.
2340 In this release, if the configure option --disable-crypt is used, glibc
2341 will not install <crypt.h> or libcrypt, making room for the separate
2342 project's versions of these files. The plan is to make this the default
2343 behavior in a future release.
2345 Changes to build and runtime requirements:
2347 GNU make 4.0 or later is now required to build glibc.
2349 Security related changes:
2351 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2352 been fixed by removing the glibc-internal IDNA implementation and using
2353 the system-provided libidn2 library instead. Originally reported by Hanno
2354 Böck and Christian Weisgerber.
2356 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2357 architecture could corrupt memory. Reported by Max Horn.
2359 CVE-2018-11236: Very long pathname arguments to realpath function could
2360 result in an integer overflow and buffer overflow. Reported by Alexey
2363 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2364 architecture could write beyond the target buffer, resulting in a buffer
2365 overflow. Reported by Andreas Schwab.
2367 The following bugs are resolved with this release:
2369 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2370 [6889] manual: 'PWD' mentioned but not specified
2371 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2372 when __WORDSIZE != 64
2373 [13762] regex: re_search etc. should return -2 on memory exhaustion
2374 [13888] build: /tmp usage during testing
2375 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2376 [14092] nptl: Support C11 threads
2377 [14095] localedata: Review / update collation data from Unicode / ISO
2379 [14508] libc: -Wformat warnings
2380 [14553] libc: Namespace pollution loff_t in sys/types.h
2381 [14890] libc: Make NT_PRFPREG canonical.
2382 [15105] libc: Extra PLT references with -Os
2383 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2385 [16335] manual: Feature test macro documentation incomplete and out of
2387 [16552] libc: Unify umount implementations in terms of umount2
2388 [17082] libc: htons et al.: statement-expressions prevent use on global
2389 scope with -O1 and higher
2390 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2391 [17438] localedata: pt_BR: wrong d_fmt delimiter
2392 [17662] libc: please implement binding for the new renameat2 syscall
2393 [17721] libc: __restrict defined as /* Ignore */ even in c11
2394 [17979] libc: inconsistency between uchar.h and stdint.h
2395 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2396 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2397 horrible machine code)
2398 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2400 [18471] libc: llseek should be a compat symbol
2401 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2403 [18991] nss: nss_files skips large entry in database
2404 [19239] libc: Including stdlib.h ends up with macros major and minor being
2406 [19463] libc: linknamespace failures when compiled with -Os
2407 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2408 [19527] locale: Normalized charset name not recognized by setlocale
2409 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2410 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2412 [19728] network: out of bounds stack read in libidn function
2413 idna_to_ascii_4i (CVE-2016-6261)
2414 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2415 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2416 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2418 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2419 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2420 [20419] dynamic-link: files with large allocated notes crash in
2422 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2423 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2424 [20980] manual: CFLAGS environment variable replaces vital options
2425 [21163] regex: Assertion failure in pop_fail_stack when executing a
2426 malformed regexp (CVE-2015-8985)
2427 [21234] manual: use of CFLAGS makes glibc detect no optimization
2428 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2429 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2430 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2431 [21508] locale: intl/tst-gettext failure with latest msgfmt
2432 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2433 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2434 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2436 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2438 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2439 [22247] network: Integer overflow in the decode_digit function in
2440 puny_decode.c in libidn (CVE-2017-14062)
2441 [22342] nscd: NSCD not properly caching netgroup
2442 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2443 [22550] localedata: es_ES locale (and other es_* locales): collation
2444 should treat ñ as a primary different character, sync the collation
2445 for Spanish with CLDR
2446 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2447 by gcc configured with --enable-default-pie
2448 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2449 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2450 crossing 2GB threshold (CVE-2017-18269)
2451 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2453 [22735] time: Misleading typo in time.h source comment regarding
2455 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2456 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2457 `__assert_perror_fail ()' to `__assert_fail_base ()'
2458 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2460 [22786] libc: Stack buffer overflow in realpath() if input size is close
2461 to SSIZE_MAX (CVE-2018-11236)
2462 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2463 through an absolute DT_NEEDED path
2464 [22792] build: tcb-offsets.h dependency dropped
2465 [22797] libc: pkey_get() uses non-reserved name of argument
2466 [22807] libc: PTRACE_* constants missing for powerpc
2467 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2468 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2469 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2470 [22848] localedata: ca_ES: update date definitions from CLDR
2471 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2472 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2473 [22896] localedata: Update locale data for an_ES
2474 [22902] math: float128 test failures with GCC 8
2475 [22918] libc: multiple common of `__nss_shadow_database'
2476 [22919] libc: sparc32: backtrace yields infinite backtrace with
2478 [22926] libc: FTBFS on powerpcspe
2479 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2481 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2482 [22947] libc: FAIL: misc/tst-preadvwritev2
2483 [22963] localedata: cs_CZ: Add alternative month names
2484 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2485 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2486 [22998] dynamic-link: execstack tests are disabled when SELinux is
2488 [23005] network: Crash in __res_context_send after memory allocation
2490 [23007] math: strtod cannot handle -nan
2491 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2492 [23036] regex: regex equivalence class regression
2493 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2494 [23069] libc: sigaction broken on riscv64-linux-gnu
2495 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2496 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2497 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2498 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2499 and libc build with -Os)
2500 [23140] localedata: More languages need two forms of month names
2501 [23145] libc: _init/_fini aren't marked as hidden
2502 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2503 [23171] math: C++ iseqsig for long double converts arguments to double
2504 [23178] nscd: sudo will fail when it is run in concurrent with commands
2505 that changes /etc/passwd
2506 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2508 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2509 [23208] localedata: New locale - Lower Sorbian (dsb)
2510 [23233] regex: Memory leak in build_charclass_op function in file
2512 [23236] stdio: Harden function pointers in _IO_str_fields
2513 [23250] nptl: Offset of __private_ss differs from GCC
2514 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2515 -mtune=generic -mfpmath=sse
2516 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2518 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2519 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2521 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2522 [23277] math: nan function should not have const attribute
2523 [23279] math: scanf and strtod wrong for some hex floating-point
2524 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2526 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2527 [23303] build: undefined reference to symbol
2528 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2529 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2531 [23313] stdio: libio vtables validation and standard file object
2533 [23329] libc: The __libc_freeres infrastructure is not properly run across
2535 [23349] libc: Various glibc headers no longer compatible with
2537 [23351] malloc: Remove unused code related to heap dumps and malloc
2539 [23363] stdio: stdio-common/tst-printf.c has non-free license
2540 [23396] regex: Regex equivalence regression in single-byte locales
2541 [23422] localedata: oc_FR: More updates of locale data
2542 [23442] build: New warning with GCC 8
2543 [23448] libc: Out of bounds access in IBM-1390 converter
2544 [23456] libc: Wrong index_cpu_LZCNT
2545 [23458] build: tst-get-cpu-features-static isn't added to tests
2546 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2548 [23467] dynamic-link: x86/CET: A property note parser bug
2555 * The GNU C Library can now be compiled with support for building static
2556 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2557 executables are like static executables but can be loaded at any address
2558 and provide additional security hardening benefits at the cost of some
2559 memory and performance. When the library is built with --enable-static-pie
2560 the resulting libc.a is usable with GCC 8 and above to create static PIE
2561 executables using the GCC option '-static-pie'. This feature is currently
2562 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2563 aarch64 with binutils 2.30 or later.
2565 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2566 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2569 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2571 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2573 * In order to support faster and safer process termination the malloc API
2574 family of functions will no longer print a failure address and stack
2575 backtrace after detecting heap corruption. The goal is to minimize the
2576 amount of work done after corruption is detected and to avoid potential
2577 security issues in continued process execution. Reducing shutdown time
2578 leads to lower overall process restart latency, so there is benefit both
2579 from a security and performance perspective.
2581 * The abort function terminates the process immediately, without flushing
2582 stdio streams. Previous glibc versions used to flush streams, resulting
2583 in deadlocks and further data corruption. This change also affects
2584 process aborts as the result of assertion failures.
2586 * On platforms where long double has the IEEE binary128 format (aarch64,
2587 alpha, mips64, riscv, s390 and sparc), the math library now implements
2588 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2589 These are the same interfaces added in version 2.26 for some platforms where
2590 this format is supported but is not the format of long double.
2592 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2593 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2594 implements interfaces for that type, as defined by ISO/IEC TS
2595 18661-3:2015. These are corresponding interfaces to those supported for
2598 * The math library now implements interfaces for the _Float32, _Float64 and
2599 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2600 corresponding interfaces to those supported for _Float128.
2602 * glibc now implements the memfd_create and mlock2 functions on Linux.
2604 * Support for memory protection keys was added. The <sys/mman.h> header now
2605 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2608 * The copy_file_range function was added.
2610 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2612 * The ldconfig utility now processes `include' directives using the C/POSIX
2613 collation ordering. Previous glibc versions used locale-specific
2614 ordering, the change might break systems that relied on that.
2616 * Support for two grammatical forms of month names has been added.
2617 In a call to strftime, the "%B" and "%b" format specifiers will now
2618 produce the grammatical form required when the month is used as part
2619 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2620 required when the month is named by itself. For instance, in Greek
2621 and in many Slavic and Baltic languages, "%B" will produce the month
2622 in genitive case, and "%OB" will produce the month in nominative case.
2624 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2625 are all valid and will all accept any known form of month
2626 name---standalone or complete, abbreviated or full. In a call to
2627 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2628 the strings used by "%B" and "%b", respectively. New query
2629 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2630 used by "%OB" and "%Ob", respectively.
2632 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2633 define the strings for %OB and %Ob, respectively; these have the
2634 same syntax as "mon" and "abmon". These arrays are optional; if they
2635 are not provided then they have the same content as "mon" and "abmon",
2638 These features are provided for locales which define "alt_mon" and/or
2639 "ab_alt_mon" in their locale source data. This release includes such
2640 alternative month name data for the following languages: Belarusian,
2641 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2643 This feature is currently a GNU extension, but it is expected to
2644 be added to the next revision of POSIX, and it is also already
2645 available on some BSD-derived operating systems.
2647 This feature will cause existing statically compiled applications
2648 to fail to load locales and fall back to the builtin C/POSIX locales.
2649 See notes below for other changes affecting compatibility.
2651 * Support for the RISC-V ISA running on Linux has been added. This port
2652 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2653 for the following ISA and ABI pairs:
2659 Deprecated and removed features, and other changes affecting compatibility:
2661 * Statically compiled applications attempting to load locales compiled for the
2662 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2663 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2664 support for two grammatical forms of the month names, also extends the locale
2665 data binary format. Static applications needing locale support must be
2666 recompiled to match the runtime and data they are deployed with. In some
2667 distributions there is an upgrade window where dynamically linked applications
2668 may use a new library but the old locale data and also fall back to the
2669 builtin C/POSIX locales; restarting the application process is sufficient to
2672 * Support for statically linked applications which call dlopen is deprecated
2673 and will be removed in a future version of glibc. Applications which call
2674 dlopen need to be linked dynamically instead.
2676 * Support for old programs which use internal stdio data structures and
2677 functions is deprecated. This includes programs which use the C++ streams
2678 provided by libstdc++ in GCC 2.95. Programs which use the internal
2679 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2680 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2681 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2682 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2683 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2684 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2685 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2686 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2687 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2688 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2689 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2690 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2691 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2692 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2693 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2694 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2695 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2696 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2697 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2698 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2699 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2700 future version of glibc. Unlike other symbol removals, these old
2701 applications will not be supported using compatibility symbols.
2703 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2704 defined by <sys/ptrace.h>.
2706 * libm no longer supports SVID error handling (calling a user-provided
2707 matherr function on error) or the _LIB_VERSION variable to control error
2708 handling. (SVID error handling and the _LIB_VERSION variable still work
2709 for binaries linked against older versions of the GNU C Library.) The
2710 libieee.a library is no longer provided. math.h no longer defines struct
2711 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2712 TLOSS, PLOSS and HUGE.
2714 * The libm functions pow10, pow10f and pow10l are no longer supported for
2715 new programs. Programs should use the standard names exp10, exp10f and
2716 exp10l for these functions instead.
2718 * The mcontext_t type is no longer the same as struct sigcontext. On
2719 platforms where it was previously the same, this changes the C++ name
2720 mangling for interfaces involving this type.
2722 * The add-ons mechanism for building additional packages at the same time as
2723 glibc has been removed. The --enable-add-ons configure option is now
2726 * The --without-fp configure option is now ignored. Whether hardware
2727 floating-point instructions are used is now configured based on whether
2728 the compiler used at configure time (without any options implied by a
2729 --with-cpu= configure option) uses such instructions.
2731 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2732 the specified string can be parsed as a domain name.
2734 * In the malloc_info output, the <heap> element may contain another <aspace>
2735 element, "subheaps", which contains the number of sub-heaps.
2737 * The libresolv function p_secstodate is no longer supported for new
2740 * The tilepro-*-linux-gnu configuration is no longer supported.
2742 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2743 and will be removed in a future release. Software that is still using
2744 either header should be updated to use standard <stdio.h> interfaces
2747 libio.h was originally the header for a set of supported GNU extensions,
2748 but they have not been maintained as such in many years, they are now
2749 standing in the way of improvements to stdio, and we don't think there are
2750 any remaining external users. _G_config.h was never intended for public
2751 use, but predates the bits convention.
2753 Changes to build and runtime requirements:
2755 * bison version 2.7 or later is required to generate code in the 'intl'
2758 Security related changes:
2760 CVE-2009-5064: The ldd script would sometimes run the program under
2761 examination directly, without preventing code execution through the
2762 dynamic linker. (The glibc project disputes that this is a security
2763 vulnerability; only trusted binaries must be examined using the ldd
2766 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2767 suffered from a one-byte overflow during ~ operator processing (either
2768 on the stack or the heap, depending on the length of the user name).
2769 Reported by Tim Rühsen.
2771 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2772 would sometimes fail to free memory allocated during ~ operator
2773 processing, leading to a memory leak and, potentially, to a denial
2776 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2777 without GLOB_NOESCAPE, could write past the end of a buffer while
2778 unescaping user names. Reported by Tim Rühsen.
2780 CVE-2017-17426: The malloc function, when called with an object size near
2781 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2782 instead of NULL. This was a regression introduced with the new malloc
2783 thread cache in glibc 2.26. Reported by Iain Buclaw.
2785 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2786 to the allocation of too much memory. (This is not a security bug per se,
2787 it is mentioned here only because of the CVE assignment.) Reported by
2790 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2791 of the number of search path components. (This is not a security
2792 vulnerability per se because no trust boundary is crossed if the fix for
2793 CVE-2017-1000366 has been applied, but it is mentioned here only because
2794 of the CVE assignment.) Reported by Qualys.
2796 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2797 for AT_SECURE or SUID binaries could be used to load libraries from the
2800 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2801 succeeds without returning an absolute path due to unexpected behaviour
2802 of the Linux kernel getcwd syscall. Reported by halfdog.
2804 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2805 an object size near the value of SIZE_MAX, would return a pointer to a
2806 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2808 CVE-2018-6551: The malloc function, when called with an object size near
2809 the value of SIZE_MAX, would return a pointer to a buffer which is too
2810 small, instead of NULL.
2812 The following bugs are resolved with this release:
2814 [866] glob: glob should match dangling symlinks
2815 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2816 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2818 [5997] math: Very slow execution of sinf function
2819 [10580] localedata: hr_HR: updated locale
2820 [10871] locale: 'mon' array should contain both nominative and genitive
2822 [12349] localedata: eu_ES: incorrect thousands separator
2823 [13605] localedata: shn_MM: new Shan locale
2824 [13805] localedata: ru_RU: currency should use ',' as radix point
2825 [13953] localedata: km_KH: locale update
2826 [13994] localedata: mjw_IN: new locale
2827 [14121] build: make writes .mo files in po directory
2828 [14333] libc: Fix the race between atexit() and exit()
2829 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2830 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2832 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2833 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2834 width Latin characters
2835 [15332] localedata: es_CU: locale update
2836 [15436] stdio: Don't close or flush stdio streams on abort
2837 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2839 [16148] localedata: ca_ES: incorrect thousands separator
2840 [16750] dynamic-link: ldd should not try to execute the binaries
2842 [16777] localedata: pl_PL: incorrect thousands separator in locale
2843 [16905] localedata: hanzi: new collation
2844 [17563] localedata: cmn_TW: add hanzi collation
2845 [17750] localedata: wrong collation order of diacritics in most locales
2846 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2848 [17956] build: Build fails on missing definitions from header file
2849 nss/nss.h when Mozilla NSS is used for cryptography
2850 [18203] libc: realpath() does not handle unreachable paths correctly
2851 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2852 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2853 [18822] libc: Internal functions are called via PLT
2854 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2855 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2856 [19574] libc: glibc should support building static PIE binaries
2857 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2859 [19971] glob: glob: Do not skip entries with zero d_ino values
2860 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2861 [20008] localedata: km_KH: convert to translit_neutral
2862 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2863 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2864 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2865 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2866 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2868 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2869 they're set, wrong errors returned by gaih_inet when lookup functions
2871 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2872 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2874 [20952] localedata: yuw_PG: new locale
2875 [21084] localedata: charmaps/IBM858: new codepage
2876 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2877 [21242] libc: assert gives pedantic warning in old gcc versions
2878 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2879 __regcall calling convention
2880 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2881 [21326] libc: C99 functions are not declared for C++11 and later if
2882 _GNU_SOURCE is not predefined by g++
2883 [21457] libc: sys/ucontext.h namespace
2884 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2885 [21660] math: GCC fails to compile a formula with tgmath.h
2886 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2887 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2888 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
2889 [21684] math: tgmath.h handling of complex integers
2890 [21685] math: tgmath.h handling of bit-fields
2891 [21686] math: tgmath.h handling of __int128
2892 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
2894 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
2896 [21750] localedata: column width of characters incompatible with classical
2898 [21754] malloc: malloc: Perform as little work as possible after heap
2899 consistency check failures
2900 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
2901 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
2902 [21791] string: Unused XXX_chk_XXX functions in libc.a
2903 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
2905 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
2907 [21845] localedata: Added new Locale bho_NP
2908 [21853] localedata: Fix abday Which looks same as day in zh_SG
2909 [21854] localedata: Added New Locale en_SC
2910 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
2911 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
2912 _dl_runtime_resolve_avx_slow
2913 [21885] network: getaddrinfo: gethosts does not release resolver context
2914 on memory allocation failure
2915 [21899] libc: XPG4.2 sigaction namespace
2916 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
2918 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
2920 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
2921 errno value, causing getaddrinfo to fail
2922 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
2923 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
2924 instead of EAI_NODATA
2925 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
2926 constant PTRACE_SEIZE_DEVEL
2927 [21930] math: C-only gcc builtins used in <math.h> isinf
2928 [21932] network: Unpaired __resolv_context_get in generic get*_r
2930 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
2931 [21944] libc: sigval namespace
2932 [21951] localedata: Update hanzi collation by stroke
2933 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
2934 sysdeps/x86_64/fpu/e_expf.S
2935 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
2936 allocation in syscall loops)
2937 [21959] localedata: Fix Country name for xh_ZA
2938 [21960] localedata: Fix abmon for bem_ZM
2939 [21966] math: AVX2 mathvec functions use FMA without checking
2940 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
2941 [21971] localedata: Added New Locale for mfe_MU
2942 [21972] libc: assert macro requires operator== (int) for its argument type
2943 [21973] math: [sparc] libm missing sqrtl compat symbol
2944 [21974] libc: Remove __bb_init_func and __bb_exit_func
2945 [21982] string: stratcliff.c: error: assuming signed overflow does not
2947 [21986] stdio: __guess_grouping is called incorrectly
2948 [21987] math: [sparc32] wrong bits/long-double.h installed
2949 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
2951 [22022] localedata: Missing country_name for mni_IN
2952 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
2954 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
2956 [22026] locale: iconv_open: heap overflow on gconv_init failure
2957 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
2958 [22035] math: [m68k] bits/math-inline.h macro namespace
2959 [22038] localedata: Fix abbreviated weeks and months for Somali
2960 [22044] localedata: Remove redundant data for Limburgish Language
2961 [22050] malloc: Linking with -lmcheck does not hook
2962 __malloc_initialize_hook correctly
2963 [22051] libc: zero terminator in the middle of glibc's .eh_frame
2964 [22052] malloc: malloc failed to compile with GCC 7 and -O3
2965 [22070] localedata: charmaps/UTF-8: wcwidth for
2966 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
2967 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
2968 Jungseong and Jongseong) should be 0
2969 [22078] nss: nss_files performance issue in multi mode
2970 [22082] math: bits/math-finite.h exp10 condition
2971 [22086] libc: pcprofiledump incorrect cross-endian condition
2972 [22093] dynamic-link: ld.so no longer searches in .../x86_64
2973 [22095] network: Name server address allocation memory leak in resolv.conf
2975 [22096] network: __resolv_conf_attach can incorrectly free passed conf
2977 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
2978 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
2980 [22111] malloc: malloc: per thread cache is not returned when thread exits
2981 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
2982 [22134] libc: [linux] implement fexecve with execveat
2983 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
2985 [22145] libc: ttyname() gives up too early in the face of namespaces
2986 [22146] math: C++ build issue with float128 on x86_64
2987 [22153] nptl: nptl: save error code before process termination
2988 [22156] libc: [hppa,ia64,microblaze] Executable stack default
2989 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
2990 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
2991 [22165] libc: [hppa] Text relocations in libc.so
2992 [22180] libc: destructor registered via __cxa_atexit is called twice
2993 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
2994 symlinks") cause "make" segfaults
2995 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
2997 [22207] libc: FAIL: stdlib/test-atexit-race
2998 [22225] math: nearbyint arithmetic moved before feholdexcept
2999 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3000 [22235] math: iscanonical in C++ and float128
3001 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3002 the svid compat wrapper
3003 [22244] math: ynf and yn are wrong without the svid compat wrapper
3004 [22273] libc: Improper assert in Linux posix_spawn implementation
3005 [22284] libc: -pg -pie doesn't work
3006 [22292] locale: localedef exits with error 4 when it should be error 1
3007 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3008 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3010 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3011 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3013 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3014 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3015 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3016 [22322] libc: [mips64] wrong bits/long-double.h installed
3017 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3018 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3020 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3021 [22343] malloc: Integer overflow in posix_memalign
3022 [22347] libc: getrandom() returns the number of bytes that were copied to
3023 the buffer even though the comments say "Return 0 on success and -1 on
3025 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3026 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3028 [22370] dynamic-link: Incorrect note padding check
3029 [22375] libc: malloc returns pointer from tcache_get when should return
3030 NULL (CVE-2017-17426)
3031 [22377] math: iseqsig, float128 and C++
3032 [22382] localedata: Error in tpi_PG locale
3033 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3034 inside the ASCII printable range
3035 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3037 [22403] localedata: Slash needs escaping in some locales
3038 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3039 [22409] network: res_hnok does not accept some host names used on the
3041 [22412] network: res_dnok, res_hnok should perform syntax checks
3042 [22413] network: ns_name_pton ignores syntactically invalid trailing
3044 [22415] stdio: setvbuf can lead to invalid free/segfault
3045 [22432] build: Non-deterministic build
3046 [22439] malloc: malloc_info should compute summary statistics for all sub-
3048 [22442] network: if_nametoindex could report index for the wrong
3049 networking interface
3050 [22446] build: aliasing violation calling readlink in handle_request
3051 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3052 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3053 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3054 __nscd_hash/__nss_hash
3055 [22463] network: p_secstodate overflow handling
3056 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3057 [22478] libc: sigwait can fail with EINTR
3058 [22505] libc: ldconfig processes include directive in locale-specific
3060 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3061 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3062 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3063 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3064 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3065 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3066 same as for Croatian
3067 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3068 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3069 [22577] libc: missing newline after "cannot allocate TLS data structures
3071 [22588] manual: manual/conf.texi: missing underscore in front of
3073 [22593] math: nextafter and nexttoward are declared with const attribute
3074 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3075 [22603] string: ia64 memchr overflows internal pointer check
3076 [22605] libc: SH clone does not set the exit code correctly
3077 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3079 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3080 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3081 modified in case of success
3082 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3083 [22615] manual: manual: ambiguous wording about errno value in case of
3085 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3087 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3088 binaries or if /proc is not mounted (CVE-2017-16997)
3089 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3090 [22630] build: $(no-pie-ldflag) is no longer effective
3091 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3092 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3093 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3094 [22637] nptl: guard size is subtracted from thread stack size instead of
3096 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3097 [22657] localedata: hu_HU: Avoid double space in date
3098 [22660] math: fmax, fmin sNaN handling on alpha
3099 [22664] libc: New warning of GCC8
3100 [22665] math: alpha: ceil and floor raise inexact exceptions
3101 [22666] math: alpha: trunc raise inexact exceptions
3102 [22667] libc: makecontext lacks stack alignment on i386
3103 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3104 [22679] libc: getcwd(3) can succeed without returning an absolute path
3106 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3107 elision and tunables
3108 [22687] math: [powerpc-nofpu] complex long double functions spurious
3110 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3111 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3112 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3114 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3115 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3117 [22701] nis: Incomplete removal of libnsl
3118 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3119 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3120 [22715] dynamic-link: FAIL: elf/tst-audit10
3121 [22719] libc: Backtrace tests fail on hppa
3122 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3123 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3124 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3125 before the first call to crypt_r () in crypt/badsalttest.c
3132 * A per-thread cache has been added to malloc. Access to the cache requires
3133 no locks and therefore significantly accelerates the fast path to allocate
3134 and free small amounts of memory. Refilling an empty cache requires locking
3135 the underlying arena. Performance measurements show significant gains in a
3136 wide variety of user workloads. Workloads were captured using a special
3137 instrumented malloc and analyzed with a malloc simulator. Contributed by
3138 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3140 * Unicode 10.0.0 Support: Character encoding, character type info, and
3141 transliteration tables are all updated to Unicode 10.0.0, using
3142 generator scripts contributed by Mike FABIAN (Red Hat).
3143 These updates cause user visible changes, especially the changes in
3144 wcwidth for many emoji characters cause problems when emoji sequences
3145 are rendered with pango, see for example:
3146 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3148 * Collation of Hungarian has been overhauled and is now consistent with "The
3149 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3152 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3154 - The GNU C Library will now detect when /etc/resolv.conf has been
3155 modified and reload the changed configuration. The new resolver option
3156 “no-reload” (RES_NORELOAD) disables this behavior.
3158 - The GNU C Library now supports an arbitrary number of search domains
3159 (configured using the “search” directive in /etc/resolv.conf);
3160 previously, there was a hard limit of six domains. For backward
3161 compatibility, applications that directly modify the ‘_res’ global
3162 object are still limited to six search domains.
3164 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3165 Library will now randomly pick a name server from the configuration as a
3166 starting point. (Previously, the second name server was always used.)
3168 * The tunables feature is now enabled by default. This allows users to tweak
3169 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3171 * New function reallocarray, which resizes an allocated block (like realloc)
3172 to the product of two sizes, with a guaranteed clean failure upon integer
3173 overflow in the multiplication. Originally from OpenBSD, contributed by
3174 Dennis Wölfing and Rüdiger Sonderfeld.
3176 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3177 These are extended versions of preadv and pwritev, respectively, taking an
3178 additional flags argument. The set of supported flags depends on the
3179 running kernel; full support currently requires kernel 4.7 or later.
3181 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3182 create a new session ID for the spawned process. This feature is
3183 scheduled to be added to the next major revision of POSIX; for the time
3184 being, it is available under _GNU_SOURCE.
3186 * errno.h is now safe to use from C-preprocessed assembly language on all
3187 supported operating systems. In this context, it will only define the
3188 Exxxx constants, as preprocessor macros expanding to integer literals.
3190 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3191 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3192 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3193 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3195 To compile programs that use this feature, the compiler must support
3196 128-bit floating point with the type name _Float128 (as defined by TS
3197 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3198 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3199 must be defined to make the new interfaces visible.
3201 The new functions and macros correspond to those present for other
3202 floating-point types (except for a few obsolescent interfaces not
3203 supported for the new type), with F128 or f128 suffixes; for example,
3204 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3205 printf or scanf formats for the new type; the strfromf128 and strtof128
3206 interfaces should be used instead.
3208 Deprecated and removed features, and other changes affecting compatibility:
3210 * The synchronization that pthread_spin_unlock performs has been changed to
3211 now be equivalent to a C11 atomic store with release memory order to the
3212 spin lock's memory location. Previously, several (but not all)
3213 architectures used stronger synchronization (e.g., containing what is
3214 often called a full barrier). This change can improve performance, but
3215 may affect odd fringe uses of spin locks that depend on the previous
3216 behavior (e.g., using spin locks as atomic variables to try to implement
3217 Dekker's mutual exclusion algorithm).
3219 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3222 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3223 will only be built and installed when the GNU C Library is configured with
3224 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3225 as TIRPC or rpcsvc-proto, to be used.
3227 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3228 libnss_compat, are deprecated, and will not be built or installed by
3231 The NIS(+) support library, libnsl, is also deprecated. By default, a
3232 compatibility shared library will be built and installed, but not headers
3233 or development libraries. Only a few NIS-related programs require this
3234 library. (In particular, the GNU C Library has never required programs
3235 that use 'gethostbyname' to be linked with libnsl.)
3237 Replacement implementations based on TIRPC, which additionally support
3238 IPv6, are available from <https://github.com/thkukuk/>. The configure
3239 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3240 name service modules, to be built and installed.
3242 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3243 support is enabled, the configured recursive resolver must support EDNS.
3244 (Responding to EDNS-enabled queries with responses which are not
3245 EDNS-enabled is fine, but FORMERR responses are not.)
3247 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3248 servers have not supported this opcode for a long time.
3250 * The _res_opcodes variable has been removed from libresolv. It had been
3251 exported by accident.
3253 * <string.h> no longer includes inline versions of any string functions,
3254 as this kind of optimization is better done by the compiler. The macros
3255 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3257 * The nonstandard header <xlocale.h> has been removed. Most programs should
3258 use <locale.h> instead. If you have a specific need for the definition of
3259 locale_t with no other declarations, please contact
3260 libc-alpha@sourceware.org and explain.
3262 * The obsolete header <sys/ultrasound.h> has been removed.
3264 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3266 * The obsolete function cfree has been removed. Applications should use
3269 * The stack_t type no longer has the name struct sigaltstack. This changes
3270 the C++ name mangling for interfaces involving this type.
3272 * The ucontext_t type no longer has the name struct ucontext. This changes
3273 the C++ name mangling for interfaces involving this type.
3275 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3276 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3277 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3278 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3279 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3280 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3281 fpregset_t type no longer has the name struct fpu. This changes the C++
3282 name mangling for interfaces involving those types.
3284 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3285 synced with the kernel:
3287 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3288 are not supported on this architecture and have been removed.
3290 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3291 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3292 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3294 Programs that assume the GET/SETREGS ptrace requests are universally
3295 available will now fail to build, instead of malfunctioning at runtime.
3297 Changes to build and runtime requirements:
3299 * Linux kernel 3.2 or later is required at runtime, on all architectures
3300 supported by that kernel. (This is a change from version 2.25 only for
3303 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3305 * On most architectures, GCC 4.9 or later is required to build the GNU C
3306 Library. On powerpc64le, GCC 6.2 or later is required.
3308 Older GCC versions and non-GNU compilers are still supported when
3309 compiling programs that use the GNU C Library. (We do not know exactly
3310 how old, and some GNU extensions to C may be _de facto_ required. If you
3311 are interested in helping us make this statement less vague, please
3312 contact libc-alpha@sourceware.org.)
3314 Security related changes:
3316 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3317 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3319 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3320 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3322 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3323 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3326 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3327 fixed (CVE-2017-12133).
3329 The following bugs are resolved with this release:
3331 [984] network: Respond to changed resolv.conf in gethostbyname
3332 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3333 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3335 [12189] libc: __stack_chk_fail should not attempt a backtrace
3337 [14096] time: Race condition on timezone/tst-timezone.out
3338 [14172] localedata: az_IR: new locale
3339 [14995] build: glibc fails to build if gold is the default linker, even if
3341 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3342 [16637] network: inet_pton function is accepting IPv6 with bad format
3343 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3344 x86 and other generic code
3345 [16875] localedata: ko_KR: fix lang_name
3346 [17225] localedata: ar_SY: localized month names for May and June are
3348 [17297] localedata: da_DK: wrong date_fmt string
3349 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3350 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3351 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3352 [19066] localedata: ar_SA abbreviated day and month names are in English
3353 [19569] network: resolv: Support an arbitrary number of search domains
3354 [19570] network: Implement random DNS server selection in the stub
3356 [19838] locale: localedef fails on PA-RISC
3357 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3358 order of 0D36 and 0D37
3359 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3361 [20098] libc: FAIL: debug/backtrace-tst on hppa
3362 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3364 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3366 [20313] localedata: Update locale data to Unicode 9.0
3367 [20424] manual: Document how to provide a malloc replacement
3368 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3370 [20686] locale: Add el_GR@euro to SUPPORTED.
3371 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3372 failures consistently
3373 [21015] dynamic-link: Document and fix --enable-bind-now
3374 [21016] nptl: pthread_cond support is broken on hppa
3375 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3376 frame-pointer on i386
3377 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3379 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3380 [21088] libc: Build fails with --enable-static-nss
3381 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3382 generic c code is used
3383 [21109] libc: Tunables broken on big-endian
3384 [21112] math: powf has large ulp errors with base close to 1 and exponent
3386 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3388 [21120] malloc: glibc malloc is incompatible with GCC 7
3389 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3391 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3392 (-0.0) when linking with -lieee
3393 [21171] math: log10, log2 and lgamma return incorrect results
3394 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3395 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3396 [21207] localedata: ce_RU: update weekdays from CLDR
3397 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3398 [21217] localedata: Update months from CLDR-31
3399 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3400 [21243] libc: support_delete_temp_file should issue warning for failed
3402 [21244] libc: support resolv_test_start() socket fd close should be
3404 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3405 new posix_spawn implementation
3406 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3407 leads to lower CPU frequency
3408 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3409 [21261] libc: [sparc64] bits/setjmp.h namespace
3410 [21267] network: [mips] bits/socket.h IOC* namespace
3411 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3412 [21270] libc: mmap64 silently truncates large offset values
3413 [21275] libc: posix_spawn always crashes on ia64 now
3414 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3415 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3416 [21289] libc: Incorrect declaration for 32-bit platforms with
3417 _FILE_OFFSET_BITS=64 causes build error
3418 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3419 not support gethostbyname4_r
3420 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3422 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3424 [21340] libc: Support POSIX_SPAWN_SETSID
3425 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3426 [21359] network: ns_name_pack needs additional byte in destination buffer
3427 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3428 against fragmentation attacks (CVE-2017-12132)
3429 [21369] network: resolv: Remove EDNS fallback
3430 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3432 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3433 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3434 [21393] stdio: Missing dup3 error check in freopen, freopen64
3435 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3436 [21399] localedata: Bad description for U00EC in
3437 localedata/charmaps/CP1254
3438 [21411] malloc: realloc documentation error
3439 [21426] network: sys/socket.h uio.h namespace
3440 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3441 [21445] libc: signal.h bsd_signal namespace
3442 [21455] network: Network headers stdint.h namespace
3443 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3445 [21475] network: resolv: Overlong search path is truncated mid-label
3446 [21511] libc: sigstack namespace
3447 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3448 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3449 bits/syscall.h: No such file or directory
3450 [21517] libc: struct sigaltstack namespace
3451 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3452 [21533] localedata: Update locale data to Unicode 10.0
3454 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3455 junk at end of line, first unrecognized character is `@'
3456 [21538] libc: SIG_HOLD missing for XPG4
3457 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3458 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3459 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3460 [21543] libc: sigevent namespace
3461 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3462 size for general purpose registers in mcontext_t structure
3463 [21550] libc: sigwait namespace
3464 [21552] libc: XPG4 bsd_signal namespace
3465 [21554] libc: sigpause namespace
3466 [21560] libc: sys/wait.h signal.h namespace
3467 [21561] libc: waitid namespace
3468 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3469 '/usr/include/stdlib.h': Permission denied
3470 [21575] libc: sys/wait.h missing struct rusage definition
3471 [21584] libc: sigaltstack etc namespace
3472 [21597] libc: siginterrupt namespace
3473 [21607] math: hppa: FAIL: math/test-tgmath
3474 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3476 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3477 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3478 stack and heap (CVE-2017-1000366)
3479 [21625] libc: wait3 namespace
3480 [21654] nss: Incorrect pointer alignment in NSS group merge result
3482 [21657] network: Parse interface zone id for node-local multicast
3483 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3485 [21666] libc: .symver is used on common symbol
3486 [21668] network: resolv: res_init cross-thread broadcast introduces race
3488 [21687] math: tgmath.h totalorder, totalordermag return type
3489 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3491 [21696] libc: Incorrect assumption of of __cpu_mask in
3492 posix/sched_cpucount.c
3493 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3494 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3496 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3497 leading to relocation crash
3498 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3499 `resolv_conf_matches (resp, conf)' failed.
3500 [21710] localedata: Added Samoan language locale for Samoa
3501 [21711] localedata: Pashto yesstr/nostr locale are missing
3502 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3503 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3504 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3505 [21723] localedata: yesstr/nostr missing for Chinese language locale
3506 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3508 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3510 [21728] localedata: New Locale for Tongan language
3511 [21729] localedata: incorrect LC_NAME fields for hi_IN
3512 [21733] localedata: yesstr and nostr are missing for zh_HK
3513 [21734] localedata: Missing yesstr and nostr are for kw_GB
3514 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3515 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3516 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3517 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3519 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3521 [21749] localedata: Wrong abbreviated day name (“abday”) for
3523 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3524 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3525 [21759] localedata: missing yesstr and nostr for Tigrinya
3526 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3527 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3528 [21767] localedata: Missing Bislama locales
3529 [21768] localedata: Missing yesstr and nostr for aa_ET
3530 [21770] localedata: Missing Field in li_NL
3531 [21778] nptl: Robust mutex may deadlock
3532 [21779] libc: MicroBlaze segfaults when loading libpthread
3533 [21783] localedata: Fix int_select international_call_prefixes
3534 [21784] localedata: Inconsistency in country_isbn
3535 [21788] localedata: Missing Country Postal Abbreviations
3536 [21794] localedata: Added-country_isbn-for-Italy
3537 [21795] localedata: Add/Fix country_isbn for France
3538 [21796] localedata: Added country_isbn for Republic of Korea
3539 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3540 [21799] localedata: Added int_select international_call_prefixes
3541 [21801] localedata: Added int_select international_call_prefixes
3542 [21804] nptl: Double semicolon in thread-shared-types.h
3543 [21807] localedata: LC_ADDRESS fix for pap_CW
3544 [21808] localedata: Fix LC_ADDRESS for pap_AW
3545 [21821] localedata: Added country_name in mai_IN
3546 [21822] localedata: Fix LC_TIME for mai_IN
3547 [21823] localedata: missing yesstr, nostr for sa_IN
3548 [21825] localedata: Fix name_mrs for mag_IN
3549 [21828] localedata: 2.26 changelog should mention user visible changes
3551 [21835] localedata: Added Maithili language locale for Nepal
3552 [21838] localedata: Removed redundant data for the_NP
3553 [21839] localedata: Fix LC_MONETARY for ta_LK
3554 [21844] localedata: Fix Latin characters and Months Sequence.
3555 [21848] localedata: Fix mai_NP Title Name
3560 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3561 24731-2:2010, is supported to enable declarations of functions from that
3562 TR. Note that not all functions from that TR are supported by the GNU C
3565 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3566 18661-1:2014, is supported to enable declarations of functions and macros
3567 from that TS. Note that not all features from that TS are supported by
3570 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3571 18661-4:2015, is supported to enable declarations of functions and macros
3572 from that TS. Note that most features from that TS are not supported by
3575 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3576 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3577 Since the GNU C Library defaults to a much newer revision of POSIX, this
3578 will only affect programs that specifically request an old conformance
3579 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3580 see a change in the visible declarations, but a program compiled with
3581 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3584 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3585 defined by all multithreaded code, but glibc has not required this for
3588 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3589 means that in a future release, the macros “major”, “minor”, and “makedev”
3590 will only be available from <sys/sysmacros.h>.
3592 These macros are not part of POSIX nor XSI, and their names frequently
3593 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3594 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3595 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3598 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3599 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3600 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3602 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3603 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3604 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3605 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3606 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3607 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3608 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3609 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3610 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3611 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3612 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3615 * New <math.h> features are added from TS 18661-1:2014:
3617 - Signaling NaN macros: SNANF, SNAN, SNANL.
3619 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3620 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3621 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3623 - llogb functions: the llogb, llogbf and llogbl functions, and the
3624 FP_LLOGB0 and FP_LLOGBNAN macros.
3626 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3629 - Comparison macros: iseqsig.
3631 - Classification macros: iscanonical, issubnormal, iszero.
3633 - Total order functions: totalorder, totalorderf, totalorderl,
3634 totalordermag, totalordermagf, totalordermagl.
3636 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3638 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3639 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3641 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3642 are added to libc. They convert a floating-point number into string.
3644 * Most of glibc can now be built with the stack smashing protector enabled.
3645 It is recommended to build glibc with --enable-stack-protector=strong.
3646 Implemented by Nick Alcock (Oracle).
3648 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3649 intended to be used instead of memset() to erase sensitive data after use;
3650 the compiler will not optimize out calls to explicit_bzero even if they
3651 are "unnecessary" (in the sense that no _correct_ program can observe the
3652 effects of the memory clear).
3654 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3655 to float instead of double. This does not affect the ABI of any libraries
3656 that are part of the GNU C Library, but may affect the ABI of other
3657 libraries that use this type in their interfaces.
3659 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3660 float_t and double_t types are now defined to long double instead of float
3661 and double. These options are not the default, and this does not affect
3662 the ABI of any libraries that are part of the GNU C Library, but it may
3663 affect the ABI of other libraries that use this type in their interfaces,
3664 if they are compiled or used with those options.
3666 * The getentropy and getrandom functions, and the <sys/random.h> header file
3669 * The buffer size for byte-oriented stdio streams is now limited to 8192
3670 bytes by default. Previously, on Linux, the default buffer size on most
3671 file systems was 4096 bytes (and thus remains unchanged), except on
3672 network file systems, where the buffer size was unpredictable and could be
3673 as large as several megabytes.
3675 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3676 for the Linux quota interface which predates kernel version 2.4.22 has
3679 * The malloc_get_state and malloc_set_state functions have been removed.
3680 Already-existing binaries that dynamically link to these functions will
3681 get a hidden implementation in which malloc_get_state is a stub. As far
3682 as we know, these functions are used only by GNU Emacs and this change
3683 will not adversely affect already-built Emacs executables. Any undumped
3684 Emacs executables, which normally exist only during an Emacs build, should
3685 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3687 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3688 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3689 “no-ip6-dotint” had already been the default, and support for the
3690 “ip6-dotint” option was removed from the Internet in 2006.
3692 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3693 flag from <resolv.h> have been removed. The option relied on a
3694 backwards-incompatible DNS extension which was never deployed on the
3697 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3698 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3699 They were already unimplemented.
3701 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3702 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3703 removed again from the IETF name lookup interface specification in RFC
3704 2553. Applications should use getaddrinfo instead.
3706 * DNSSEC-related declarations and definitions have been removed from the
3707 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3708 decode the data part of DNSSEC record types. Previous versions of glibc
3709 only implemented minimal support for the previous version of DNSSEC, which
3710 is incompatible with the currently deployed version.
3712 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3713 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3714 <arpa/nameser.h> header file because the distinction between RR types and
3715 meta-RR types is not officially standardized, subject to revision, and
3716 thus not suitable for encoding in a macro.
3718 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3719 and rhook members of the res_state type in <resolv.h> have been removed.
3720 The glibc stub resolver did not support these hooks, but the header file
3721 did not reflect that.
3723 * For multi-arch support it is recommended to use a GCC which has
3724 been built with support for GNU indirect functions. This ensures
3725 that correct debugging information is generated for functions
3726 selected by IFUNC resolvers. This support can either be enabled by
3727 configuring GCC with '--enable-gnu-indirect-function', or by
3728 enabling it by default by setting 'default_gnu_indirect_function'
3729 variable for a particular architecture in the GCC source file
3732 * GDB pretty printers have been added for mutex and condition variable
3733 structures in POSIX Threads. When installed and loaded in gdb these pretty
3734 printers show various pthread variables in human-readable form when read
3735 using the 'print' or 'display' commands in gdb.
3737 * Tunables feature added to allow tweaking of the runtime for an application
3738 program. This feature can be enabled with the '--enable-tunables' configure
3739 flag. The GNU C Library manual has details on usage and README.tunables has
3740 instructions on adding new tunables to the library.
3742 * A new version of condition variables functions have been implemented in
3743 the NPTL implementation of POSIX Threads to provide stronger ordering
3746 * A new version of pthread_rwlock functions have been implemented to use a more
3747 scalable algorithm primarily through not using a critical section anymore to
3750 Security related changes:
3752 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3753 have been created with makecontext could fail to terminate due to a
3754 missing .cantunwind annotation. This has been observed to lead to a hang
3755 (denial of service) in some Go applications compiled with gccgo. Reported
3756 by Andreas Schwab. (CVE-2016-6323)
3758 * The DNS stub resolver functions would crash due to a NULL pointer
3759 dereference when processing a query with a valid DNS question type which
3760 was used internally in the implementation. The stub resolver now uses a
3761 question type which is outside the range of valid question type values.
3764 The following bugs are resolved with this release:
3766 [4099] stdio: Overly aggressive caching by stream i/o functions.
3767 [7065] build: Support building glibc with -fstack-protector or -fstack-
3769 [9842] localedata: en_CA: incorrect date format
3770 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3771 before it started waiting
3772 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3773 [15765] nptl: sem_open is wrongly a cancellation point
3774 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3775 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3777 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3778 library linked with pthread
3779 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3780 "FIXME: Ingo" issue)
3781 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3782 [17252] libc: getrandom and getentropy syscall
3783 [17730] malloc: thread-local storage is sometimes improperly free()'d
3784 after being __libc_memalign()'d
3785 [18241] stdio: failed fseek on memstream does not set errno and can fail
3787 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3789 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3790 PTHREAD_PRIO_INHERIT mutex on ARM
3791 [18784] network: res_query and related function crash for special record
3792 type queries (CVE-2015-5180)
3793 [19380] math: strtod does not raise "inexact"
3794 [19387] string: Integer overflow in memchr
3795 [19390] string: Integer overflow in strncat
3796 [19398] build: linknamespace tests fail with massively parallel build
3797 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3799 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3800 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3801 [19514] libc: [PATCH] Fix spelling errors in spelling
3802 "implement"/"implementation" in several places
3803 [19582] network: Deprecate RES_USE_INET6
3804 [19673] manual: clog10 docs appear to be erroneous
3805 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3806 causes a segmentation fault
3807 [19826] libc: invalid pointer returned from __tls_get_addr with static
3809 [20016] network: resolv: Remove hooks support from the API
3810 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3812 [20033] math: [x86_64] vectorized math function don't call the __finite
3814 [20116] nptl: use after free in pthread_create
3815 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3816 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3818 [20311] nptl: please install proc_service.h
3819 [20366] libc: Compilation errors in installed headers in strict-compliance
3821 [20370] malloc: malloc: Arena free list management is still racy
3822 (incorrect fix in bug 19243)
3823 [20386] libc: assert (X = 0) does not result in GCC warning
3824 [20432] malloc: malloc: Minimize interface required for interposition
3825 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3826 in _Unwind_Backtrace (CVE-2016-6323)
3827 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3828 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3830 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3831 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3832 [20477] network: resolv: incorrect double-checked locking related to
3834 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3836 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3838 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3839 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3840 cause transition penalty
3841 [20517] math: sparcv9 missing fdiml compat symbol
3842 [20524] manual: strverscmp is inconsistent
3843 [20525] libc: <sys/quota.h> should be based on kernel headers
3844 [20539] math: GCC 7 -static -lm fails to link at -O3
3845 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3847 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3849 [20591] network: Remove obsolete DNSSEC support
3850 [20592] network: DNS resource record type classification macros in
3851 <arpa/nameser.h> are incorrect
3852 [20593] network: Update DNS RR type definitions
3853 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3854 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3856 [20629] network: libresolv: Remove support for bitstring labels
3858 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3859 assertion: "maxidx >= 2"
3860 [20660] math: [arm] Use VSQRT
3861 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3862 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3863 [20689] libc: Test for FMA should also check for AVX.
3864 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3865 [20715] math: iszero macro breaks existing code
3866 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3867 [20728] libc: powerpc: Missing TOC stub in clone
3868 [20729] build: glibc-2.24 fails to build for i486 with -Os
3869 [20750] build: Build fails with default PIE enabled gcc-6.x
3870 [20768] math: [alpha] sqrt fegetenv namespace
3871 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3873 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3874 __FLT_EVAL_METHOD__ is 2
3875 [20790] network: rpcgen buffer overrun in get_prog_declaration
3876 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3877 [20829] libc: crypt snprintf namespace
3878 [20847] libc: tst-vfork3 failure
3879 [20855] math: Default bits/mathdef.h has inappropriate float_t
3880 [20859] math: [sh4] FP_ILOGB0 invalid
3881 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3882 U+20AC), not same as GBK
3883 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3884 [20916] math: pow handling of sNaN arguments
3885 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3886 [20919] math: Bad pow (qNaN, 0) result with -lieee
3887 [20940] math: hypot sNaN handling
3888 [20947] math: fmax, fmin sNaN handling
3889 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
3890 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
3892 [20971] string: powerpc64/power7 memchr overflows internal pointer check
3893 [20973] nptl: robust mutexes: Lost wake-ups
3894 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
3895 [20978] nis: strlen on null pointer in nss_nisplus
3896 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
3898 [21014] string: i686 memchr overflows internal pointer check
3899 [21019] libc: [mips] n32 lseek incorrect on overflow
3900 [21022] libc: [microblaze] __backtrace get_frame_size namespace
3901 [21026] libc: [MIPS] readahead syscall is broken on n64
3902 [21028] math: Fallback fesetexceptflag should always succeed
3903 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
3904 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
3906 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
3907 [21061] librt: [microblaze] librt lost clock_* exports
3908 [21073] libc: tunables: insecure environment variables passed to
3909 subprocesses with AT_SECURE
3910 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
3914 * The minimum Linux kernel version that this version of the GNU C Library
3915 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
3916 kernel version 2.6.32 or later suffices (on architectures that already
3917 required kernel versions more recent than 3.2, those requirements remain
3918 unchanged). Linux 3.2 or later kernel headers are required on all
3921 * The pap_AN locale has been deleted. This has been deprecated for a long
3922 time. It has been replaced by pap_AW & pap_CW, both of which have long
3923 been included in previous releases.
3925 * The readdir_r and readdir64_r functions have been deprecated. It is
3926 recommended to use readdir and readdir64 instead.
3928 * The type “union wait” has been removed. It was deprecated in the early
3929 1990s and never part of POSIX. Application code should use the int type
3930 instead of “union wait”.
3932 * A new NSS action is added to facilitate large distributed system
3933 administration. The action, MERGE, allows remote user stores like LDAP
3934 to be merged into local user stores like /etc/groups in order to provide
3935 easy to use, updated, and managed sets of merged credentials. The new
3936 action can be used by configuring it in /etc/nsswitch.conf:
3937 group: files [SUCCESS=merge] nis
3938 Implemented by Stephen Gallagher (Red Hat).
3940 * The deprecated __malloc_initialize_hook variable has been removed from the
3943 * The long unused localedef --old-style option has been removed. It hasn't
3944 done anything in over 16 years. Scripts using this option can safely
3947 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
3948 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
3949 return the next representable value in the direction of positive infinity
3950 and the nextdown functions return the next representable value in the
3951 direction of negative infinity. These are currently enabled as GNU
3954 Security related changes:
3956 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
3957 could result in a stack overflow when getnetbyname was called with an
3958 overly long name. (CVE-2016-3075)
3960 * Previously, getaddrinfo copied large amounts of address data to the stack,
3961 even after the fix for CVE-2013-4458 has been applied, potentially
3962 resulting in a stack overflow. getaddrinfo now uses a heap allocation
3963 instead. Reported by Michael Petlan. (CVE-2016-3706)
3965 * The glob function suffered from a stack-based buffer overflow when it was
3966 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
3967 Reported by Alexander Cherepanov. (CVE-2016-1234)
3969 * The Sun RPC UDP client could exhaust all available stack space when
3970 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
3971 alloca plugin for GCC. (CVE-2016-4429)
3973 * The IPv6 name server management code in libresolv could result in a memory
3974 leak for each thread which is created, performs a failing naming lookup,
3975 and exits. Over time, this could result in a denial of service due to
3976 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
3978 The following bugs are resolved with this release:
3980 [1170] localedata: ne_NP: update Nepali locale definition file
3981 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
3983 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
3984 [6796] math: fdim() does not set errno on overflow
3985 [10354] libc: posix_spawn should use vfork() in more cases than presently
3986 [11213] localedata: localedata: add copyright disclaimer to locale files
3987 [12143] localedata: chr_US: new Cherokee locale
3988 [12450] localedata: sgs_LT: new locale
3989 [12676] localedata: ln_CD: new locale
3990 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
3992 [13304] math: fma, fmaf, fmal produce wrong results
3993 [14259] build: --localedir arg to configure is ignored
3994 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
3995 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
3996 [14934] localedata: es_CL: wrong first weekday chilean locale
3997 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
3999 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4001 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4002 [15368] nptl: raise() is not async-signal-safe
4003 [15479] math: ceil, floor, round and trunc raise inexact exception
4004 [15578] localedata: kk_KZ: various updates
4005 [16003] localedata: pap_AN: punt old locale
4006 [16137] localedata: iw_IL: punt old locale
4007 [16190] localedata: eo: new esperanto locale
4008 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4009 [16742] malloc: race condition: pthread_atfork() called before first
4010 malloc() results in unexpected locking behaviour/deadlocks
4011 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4013 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4014 [17565] localedata: pt_PT: wrong (work-)week start
4015 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4016 [17950] build: Build fails with -msse
4017 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4018 [18433] libc: posix_spawn does not return correctly upon failure to
4020 [18453] localedata: charmaps/IBM875: incorrect codes
4021 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4023 [18896] localedata: he_IL: improvements for currency
4024 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4025 Romanian locale data
4026 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4028 [19056] libc: Deprecate readdir_r
4029 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4031 [19198] localedata: nl_NL: small improvements for Dutch locales
4032 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4033 nameservers (CVE-2016-5417)
4034 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4036 [19400] locale: Language missing in "iso-639.def", trivial fix in
4038 [19431] malloc: Deadlock between fflush, getdelim, and fork
4039 [19505] libc: Incorrect file descriptor validity checks in
4040 posix_spawn_file_actions_add{open,close,dup2}
4041 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4042 when using RTLD_NEXT
4043 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4044 `intl/{gettextP,loadinfo}.h'
4045 [19534] libc: execle, execlp may use malloc
4046 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4047 [19573] network: res_nclose and __res_maybe_init disagree about name
4048 server initialization, breaking Hesiod
4049 [19575] localedata: Status of GB18030 tables
4050 [19581] localedata: sr_* date_fmt string contains additional newline
4051 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4053 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4054 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4055 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4056 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4058 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4060 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4062 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4063 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4064 [19633] locale: strfmon_l applies global locale to number formatting
4065 [19642] network: Memory leak in getnameinfo
4066 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4067 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4069 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4070 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4072 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4073 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4075 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4077 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4079 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4080 pointers and lengths in error-case.
4081 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4082 report errors on UTF-16 surrogates values.
4083 [19755] nscd: nscd assertion failure in gc
4084 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4085 [19759] libc: mempcpy shouldn't be inlined
4086 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4087 [19765] libc: s390 needs an optimized mempcpy
4088 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4089 NAME_MAX limit assumption (CVE-2016-1234)
4090 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4091 [19787] network: Missing and incorrect truncation checks in getnameinfo
4092 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4094 [19791] network: Assertion failure in res_query.c with un-connectable name
4096 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4097 [19822] math: libm.so install clobbers old version
4098 [19825] network: resolv: send_vc can return uninitialized data in second
4099 response to getaddrinfo
4100 [19830] network: nss_dns: should check RDATA length against buffer length
4101 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4102 confronted with A/AAAA records of invalid size
4103 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4104 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4105 [19853] stdio: Printing IBM long double in decimal with high precision is
4107 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4108 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4109 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4111 [19865] network: Assertion failure or memory leak in
4112 _nss_dns_getcanonname_r
4113 [19868] network: nss_dns: netent code does not skip over non-PTR records
4114 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4116 [19881] string: Improve x86-64 memset
4117 [19907] string: Incorrect memcpy tests
4118 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4120 [19925] libc: termios.h XCASE namespace
4121 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4122 [19929] libc: limits.h NL_NMAX namespace
4123 [19931] stdio: Memory leak in vfprintf
4124 [19957] libc: clone(CLONE_VM) access invalid parent memory
4125 [19963] localedata: en_IL: New locale
4126 [19989] stdio: stdio.h cuserid namespace
4127 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4129 [19996] locale: langinfo.h nl_langinfo_l namespace
4130 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4131 [20010] network: getaddrinfo: Stack overflow in hostent translation
4133 [20012] stdio: libio: fmemopen append mode failure
4134 [20014] stdio: stdio.h namespace for pre-threads POSIX
4135 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4136 [20023] libc: fcntl.h timespec namespace
4137 [20024] math: [x86_64] vectorized sincos trashes the stack
4138 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4139 [20041] time: sys/time.h timespec namespace
4140 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4141 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4142 [20051] libc: ttyslot in wrong header under wrong conditions
4143 [20054] libc: gethostname not declared for XPG4
4144 [20055] libc: termios.h missing tcgetsid for XPG4
4145 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4147 [20073] libc: sys/stat.h fchmod namespace
4148 [20074] libc: stdlib.h rand_r namespace
4149 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4150 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4152 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4153 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4155 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4156 [20119] libc: Wrong mask for processors level type from CPUID
4157 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4158 AS not supporting AVX512
4159 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4161 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4162 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4164 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4165 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4166 [20178] libc: posix_spawn{p} should not call exit
4167 [20191] stdio: libio: vtables hardening
4168 [20195] string: FMA4 detection requires CPUID execution with register
4170 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4171 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4173 [20212] math: acos (sNaN) returns sNaN
4174 [20213] math: asin (sNaN) returns sNaN
4175 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4176 [20218] math: [i386] asinhl (sNaN) returns sNaN
4177 [20219] math: [i386] atanhl (sNaN) returns sNaN
4178 [20222] stdio: fopencookie: Mangle function pointers
4179 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4180 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4181 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4183 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4184 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4185 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4186 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4187 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4188 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4189 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4190 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4191 [20240] math: modf (sNaN) returns sNaN
4192 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4193 [20250] math: frexp (sNaN) returns sNaN
4194 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4195 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4197 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4198 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4199 subscript is below array bounds [-Werror=array-bounds]
4200 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4201 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4203 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4204 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4206 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4207 "invalid" exceptions
4208 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4209 [20316] localedata: id_ID: Februari instead of Pebruari
4210 [20327] string: POWER8 strcasecmp returns incorrect result
4211 [20347] math: Failure: Test: j0_downward (0xap+0)
4212 [20348] libc: FAIL: misc/tst-preadvwritev64
4213 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4214 [20350] libc: There is no test for p{read,write}64
4215 [20357] math: Incorrect cos result for 1.5174239687223976
4216 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4220 * Unicode 8.0.0 Support: Character encoding, character type info, and
4221 transliteration tables are all updated to Unicode 8.0.0, using new
4222 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4223 These updates cause user visible changes, such as the fixes for bugs
4224 89, 16061, and 18568.
4226 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4227 kernel-internal CPU set size. This means that requests that change the
4228 CPU affinity which failed before (for example, an all-ones CPU mask) will
4229 now succeed. Applications that need to determine the effective CPU
4230 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4231 setting it because the kernel can adjust it (and the previous size check
4232 would not detect this in the majority of cases).
4234 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4235 the following new symbols are used: fts64_children, fts64_close,
4236 fts64_open, fts64_read and fts64_set.
4238 * getaddrinfo now detects certain invalid responses on an internal netlink
4239 socket. If such responses are received, an affected process will
4240 terminate with an error message of "Unexpected error <number> on netlink
4241 descriptor <number>" or "Unexpected netlink response of size <number> on
4242 descriptor <number>". The most likely cause for these errors is a
4243 multi-threaded application which erroneously closes and reuses the netlink
4244 file descriptor while it is used by getaddrinfo.
4246 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4247 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4248 unnecessary serialization of memory allocation requests across threads.
4249 The defect is now corrected. Users should see a substantial increase in
4250 the concurent throughput of allocation requests for applications which
4251 trigger this bug. Affected applications typically create and
4252 destroy threads frequently. (Bug 19048 was reported and analyzed by
4255 * There is now a --disable-timezone-tools configure option for disabling the
4256 building and installing of the timezone related utilities (zic, zdump, and
4257 tzselect). This is useful for people who build the timezone data and code
4258 independent of the GNU C Library.
4260 * The obsolete header <regexp.h> has been removed. Programs that require
4261 this header must be updated to use <regex.h> instead.
4263 * The obsolete functions bdflush, create_module, get_kernel_syms,
4264 query_module and uselib are no longer available to newly linked binaries;
4265 the header <sys/kdaemon.h> has been removed. These functions and header
4266 were specific to systems using the Linux kernel and could not usefully be
4267 used with the GNU C Library on systems with version 2.6 or later of the
4270 * Optimized string, wcsmbs and memory functions for IBM z13.
4271 Implemented by Stefan Liebler.
4273 * Newly linked programs that define a variable called signgam will no longer
4274 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4275 require signgam to be set by those functions must ensure that they use the
4276 variable provided by the GNU C Library and declared in <math.h>, without
4277 defining their own copy.
4279 * The minimum GCC version that can be used to build this version of the GNU
4280 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4281 still be used to compile programs using the GNU C Library.
4283 Security related changes:
4285 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4286 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4288 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4289 the pointer guard feature. It is always enabled. Previously,
4290 LD_POINTER_GUARD could be used to disable security hardening in binaries
4291 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4294 * An integer overflow in hcreate and hcreate_r could lead to an
4295 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4297 * The catopen function no longer has unbounded stack usage. Reported by
4298 Max. (CVE-2015-8779)
4300 * The nan, nanf and nanl functions no longer have unbounded stack usage
4301 depending on the length of the string passed as an argument to the
4302 functions. Reported by Joseph Myers. (CVE-2014-9761)
4304 * A stack-based buffer overflow was found in libresolv when invoked from
4305 libnss_dns, allowing specially crafted DNS responses to seize control
4306 of execution flow in the DNS client. The buffer overflow occurs in
4307 the functions send_dg (send datagram) and send_vc (send TCP) for the
4308 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4309 family. The use of AF_UNSPEC triggers the low-level resolver code to
4310 send out two parallel queries for A and AAAA. A mismanagement of the
4311 buffers used for those queries could result in the response of a query
4312 writing beyond the alloca allocated buffer created by
4313 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4314 the overflow. Thanks to the Google Security Team and Red Hat for
4315 reporting the security impact of this issue, and Robert Holiday of
4316 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4318 The following bugs are resolved with this release:
4320 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4321 [887] math: Math library function "logb" and "nextafter" inconsistent
4322 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4323 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4324 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4325 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4327 [4404] localedata: German translation of "Alarm clock" is misleading
4328 [6799] math: nextafter() and nexttoward() doen't set errno on
4329 overflow/underflow errors
4330 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4332 [10432] nis: _nss_nis_setnetgrent assertion failure
4333 [11460] libc: fts has no LFS support
4334 [12926] network: getaddrinfo()/make_request() may spin forever
4335 [13065] nptl: Race condition in pthread barriers
4336 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4337 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4339 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4340 [14912] libc: Rename non-installed bits/*.h headers
4341 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4342 [15367] math: Let gcc use __builtin_isinf
4343 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4344 [15421] math: lgamma wrongly sets signgam for ISO C
4345 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4346 FE_INVALID with argument out of range
4347 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4349 [15786] dynamic-link: ifunc resolver functions can smash function
4351 [15918] math: Unnecessary check for equality in hypotf()
4352 [16061] localedata: Review / update transliteration data
4353 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4355 [16141] time: strptime %z offset restriction
4356 [16171] math: drem should be alias of remainder
4357 [16296] math: fegetround is pure?
4358 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4359 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4361 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4362 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4364 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4365 "Exception "Inexact" set" on ppc32
4366 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4367 [16517] math: Missing underflow exception from tanf/tan/tanl
4368 [16519] math: Missing underflow exception from sinhf
4369 [16520] math: Missing underflow exception from tanhf
4370 [16521] math: Missing underflow exception from exp2
4371 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4373 [16734] stdio: fopen calls mmap to allocate its buffer
4374 [16961] math: nan function incorrect handling of bad sequences
4375 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4376 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4377 [16985] locale: localedef: confusing error message when opening output
4379 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4380 [17197] locale: Redundant shift character in iconv conversion output at
4382 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4383 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4384 [17250] dynamic-link: static linking breaks nss loading
4385 (getaddrinfo/getpwnam/etc...)
4386 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4388 [17441] math: isnan() should use __builtin_isnan() in GCC
4389 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4390 (related to lock elision)
4391 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4392 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4393 [17887] time: strptime should be able to parse "+01:00" style timezones
4394 [17905] libc: catopen() Multiple unbounded stack allocations
4396 [18084] libc: backtrace (..., 0) dumps core on x86
4397 [18086] libc: nice() sets errno to 0 on success
4398 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4399 is too large (CVE-2015-8778)
4400 [18251] dynamic-link: SONAME missing when audit modules provides path
4401 [18265] libc: add attributes for wchar string and memory functions
4402 [18370] math: csqrt missing underflows
4403 [18421] libc: [hppa] read-only segment has dynamic relocations
4404 [18472] libc: Obsolete syscall wrappers should be compat symbols
4405 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4406 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4407 [18525] localedata: Remove locale timezone information
4408 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4409 [18568] localedata: Update locale data to Unicode 8.0
4410 [18589] locale: sort-test.sh fails at random
4411 [18595] math: ctan, ctanh missing underflows
4412 [18604] libc: assert macro-expands its argument
4413 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4414 contains a vector instruction exception.
4415 [18611] math: j1, jn missing errno setting on underflow
4416 [18618] localedata: sync Chechen locale definitions with other *_RU
4418 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4419 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4420 [18665] network: In send_dg, the recvfrom function is NOT always using the
4421 buffer size of a newly created buffer (CVE-2015-7547)
4422 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4424 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4426 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4427 [18699] math: tilegx cproj() for various complex infinities does not yield
4429 [18724] libc: Harden put*ent functions against data injection
4430 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4431 [18755] build: build errors with -DNDEBUG
4432 [18757] stdio: fmemopen fails to set errno on failure
4433 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4435 [18781] libc: openat64 lacks O_LARGEFILE
4436 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4437 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4438 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4439 [18790] math: [ldbl-128ibm] tanhl inaccurate
4440 [18795] libc: stpncpy fortification misses buffer lengths that are
4441 statically too large
4442 [18796] build: build fails for --disable-mathvec
4443 [18803] math: hypot missing underflows
4444 [18820] stdio: fmemopen may leak memory on failure
4445 [18823] math: csqrt spurious underflows
4446 [18824] math: fma spurious underflows
4447 [18825] math: pow missing underflows
4448 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4449 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4450 [18870] build: sem_open.c fails to compile with missing symbol
4452 [18872] stdio: Fix memory leak in printf_positional
4453 [18873] libc: posix_fallocate overflow check ineffective
4454 [18875] math: Excess precision leads incorrect libm
4455 [18877] libc: arm: mmap offset regression
4456 [18887] libc: memory corruption when using getmntent on blank lines
4457 [18918] localedata: hu_HU: change time to HH:MM:SS format
4458 [18921] libc: Regression: extraneous stat() and fstat() performed by
4460 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4461 binaries (CVE-2015-8777)
4462 [18951] math: tgamma missing underflows
4463 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4465 [18953] localedata: lt_LT: change currency symbol to the euro
4466 [18956] math: powf inaccuracy
4467 [18961] math: [i386] exp missing underflows
4468 [18966] math: [i386] exp10 missing underflows
4469 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4470 [18969] build: multiple string test failures due to missing locale
4472 [18970] libc: Reference of pthread_setcancelstate in libc.a
4473 [18977] math: float / long double Bessel functions not in XSI POSIX
4474 [18980] math: i386 libm functions return with excess range and precision
4475 [18981] math: i386 scalb*, ldexp return with excess range and precision
4476 [18982] stdio: va_list and vprintf
4477 [18985] time: Passing out of range data to strftime() causes a segfault
4479 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4480 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4481 [19012] locale: iconv_open leaks memory on error path
4482 [19016] math: clog, clog10 inaccuracy
4483 [19018] nptl: Mangle function pointers in tls_dtor_list
4484 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4485 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4486 [19048] malloc: malloc: arena free list can become cyclic, increasing
4488 [19049] math: [powerpc] erfc incorrect zero sign
4489 [19050] math: [powerpc] log* incorrect zero sign
4490 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4491 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4492 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4493 [19074] network: Data race in _res_hconf_reorder_addrs
4494 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4495 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4496 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4498 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4500 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4501 [19086] manual: posix_fallocate64 documented argument order is wrong.
4502 [19088] math: lround, llround missing exceptions close to overflow
4504 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4505 [19095] math: dbl-64 lrint incorrect for 64-bit long
4506 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4507 [19124] dynamic-link: ld.so failed to build with older assmebler
4508 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4509 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4510 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4511 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4512 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4513 pthread_setaffinity_np
4514 [19156] math: [ldbl-128] j0l spurious underflows
4515 [19164] nptl: tst-getcpu fails with many possible CPUs
4516 [19168] math: math/test-ildoubl and math/test-ldouble failure
4517 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4518 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4520 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4521 (FE_NOMASK_ENV) do not clear SSE exceptions
4522 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4523 _int_new_arena/reused_arena
4524 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4525 [19201] math: dbl-64 remainder incorrect sign of zero result
4526 [19205] math: bits/math-finite.h conditions do not match math.h and
4528 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4529 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4530 for C99-based standards
4531 [19212] libc: features.h not -Wundef clean
4532 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4534 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4535 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4536 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4538 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4539 "inexact" exceptions
4540 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4542 [19242] libc: strtol incorrect in Turkish locales
4543 [19243] malloc: reused_arena can pick an arena on the free list, leading
4544 to an assertion failure and reference count corruption
4545 [19253] time: tzset() ineffective when temporary TZ did not include DST
4547 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4548 [19270] math: [hppa] Shared libm missing __isnanl
4549 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4550 MAP_HUGETLB and MAP_STACK defines
4551 [19313] nptl: Wrong __cpu_mask for x32
4552 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4553 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4554 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4555 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4556 [19363] time: x32: times() return value wrongly truncates/sign extends
4558 [19367] dynamic-link: Improve branch prediction on Silvermont
4559 [19369] network: Default domain name not reset by res_ninit when "search"
4560 / "domain" entry is removed from resolv.conf
4561 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4563 [19385] localedata: bg_BG: time separator should be colon, not comma
4564 [19408] libc: linux personality syscall wrapper may erroneously return an
4565 error on 32-bit architectures
4566 [19415] libc: dladdr returns wrong names on hppa
4567 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4568 IBM905, IBM907, and IBM909
4569 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4570 [19443] build: build failures with -DDEBUG
4571 [19451] build: Make check fails on test-double-vlen2
4572 [19462] libc: Glibc failed to build with -Os
4573 [19465] math: Wrong code with -Os
4574 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4576 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4578 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4579 [19486] math: S390: Math tests fail with "Exception Inexact set".
4580 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4581 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4583 [19590] math: Fail to build shared objects that use libmvec.so functions.
4587 * The following bugs are resolved with this release:
4589 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4590 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4591 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4592 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4593 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4594 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4595 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4596 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4597 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4598 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4599 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4600 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4601 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4602 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4603 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4604 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4605 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4606 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4607 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4608 18657, 18676, 18694, 18696, 18887.
4610 * Cache information can be queried via sysconf() function on s390 e.g. with
4611 _SC_LEVEL1_ICACHE_SIZE as argument.
4613 * A buffer overflow in gethostbyname_r and related functions performing DNS
4614 requests has been fixed. If the NSS functions were called with a
4615 misaligned buffer, the buffer length change due to pointer alignment was
4616 not taken into account. This could result in application crashes or,
4617 potentially arbitrary code execution, using crafted, but syntactically
4618 valid DNS responses. (CVE-2015-1781)
4620 * The time zone file parser has been made more robust against crafted time
4621 zone files, avoiding heap buffer overflows related to the processing of
4622 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4623 large time zone data files. Overly long time zone specifiers in the TZ
4624 variable no longer result in stack overflows and crashes.
4626 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4627 for LD and GD on x86 and x86-64, has been implemented. You will need
4628 binutils-2.24 or later to enable this optimization.
4630 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4631 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4632 Hat). These updates cause user visible changes, such as the fix for bug
4635 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4636 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4637 condition in some applications.
4639 * Added vector math library named libmvec with the following vectorized x86_64
4640 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4642 The library can be disabled with --disable-mathvec. Use of the functions is
4643 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4644 Shared library libmvec.so is linked in as needed when using -lm (no need to
4645 specify -lmvec explicitly for not static builds).
4646 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4648 * A new fmemopen implementation has been added with the goal of POSIX
4649 compliance. The new implementation fixes the following long-standing
4650 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4651 old implementation is still present for use be by existing binaries.
4653 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4654 releases. It has been fixed to match 2.19 and older, but binaries built
4655 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4657 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4658 Contributed by Roland McGrath (Google).
4660 * The header <regexp.h> is deprecated, and will be removed in a future
4661 release. Use of this header will trigger a deprecation warning.
4662 Application developers should update their code to use <regex.h> instead.
4664 This header was formerly part of SUS, but was deprecated in 1994 and
4665 removed from the standard in 2001. Also, the glibc implementation
4666 leaks memory. See BZ#18681 for more details.
4670 * The following bugs are resolved with this release:
4672 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4673 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4674 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4675 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4676 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4677 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4678 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4679 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4680 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4681 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4684 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4685 too little memory for the to-be-scanned arguments and overflow the
4686 allocated buffer. The implementation now correctly computes the required
4687 buffer size when using malloc, and switches to malloc from alloca as
4690 * A new semaphore algorithm has been implemented in generic C code for all
4691 machines. Previous custom assembly implementations of semaphore were
4692 difficult to reason about or ensure that they were safe. The new version
4693 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4694 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4695 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4697 * Port to Altera Nios II has been contributed by Mentor Graphics.
4699 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4700 implementations for powerpc64/powerpc64le.
4701 Implemented by Adhemerval Zanella (IBM).
4703 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4704 and powerpc64le. This may improve lock scaling of existing programs on
4705 HTM capable systems. The lock elision code is only enabled with
4706 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4707 powerpc will issue a transaction abort on every syscall to avoid side
4708 effects being visible outside transactions.
4710 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4711 AArch64. Contributed by ARM Ltd.
4713 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4715 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4716 under certain input conditions resulting in the execution of a shell for
4717 command substitution when the application did not request it. The
4718 implementation now checks WRDE_NOCMD immediately before executing the
4719 shell and returns the error WRDE_CMDSUB as expected.
4721 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4722 processing format strings with a large number of format specifiers.
4724 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4725 infinite loop if the DNS response contained a PTR record of an unexpected
4728 * The minimum GCC version that can be used to build this version of the GNU
4729 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4730 still be used to compile programs using the GNU C Library.
4732 * The GNU C Library is now built with -Werror by default. This can be
4733 disabled by configuring with --disable-werror.
4735 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4737 * The obsolete sigvec function has been removed. This was the original
4738 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4739 programs have been using instead for about 25 years. Of course, ABI
4740 compatibility for old binaries using sigvec remains intact.
4742 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4743 with newer versions of bison.
4745 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4746 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4747 registers overlay two consecutive single-precision registers. MIPS32R2
4748 introduced a new FPU mode (FR=1) where double-precision registers extend the
4749 corresponding single-precision registers which is incompatible with the
4750 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4751 require the use of FR=1 making a transition necessary. New o32 ABI
4752 extensions enable users to migrate over time from the original o32 ABI
4753 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4754 tracks the ABI of any loaded object and verifies that new objects are
4755 compatible. Mode transitions will also be requested as required and
4756 unsupportable objects will be rejected. The ABI checks include both soft and
4757 hard float ABIs for o32, n32 and n64.
4759 GCC 5 with GNU binutils 2.25 onwards:
4760 It is strongly recommended that all o32 system libraries are built using the
4761 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4762 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4763 compiler using --with-fp-32=xx to set this by default.
4767 * The following bugs are resolved with this release:
4769 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4770 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4771 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4772 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4773 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4774 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4775 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4776 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4777 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4778 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4779 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4780 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4781 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4782 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4783 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4785 * Reverted change of ABI data structures for s390 and s390x:
4786 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4787 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4788 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4789 are preserved pointing straight to the same implementation as the old ones.
4790 Given that, new callers will simply provide a too-big buffer to these
4791 functions. Any applications/libraries out there that embed jmp_buf or
4792 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4793 against 2.19 headers will have to rebuilt again. This is necessary in any
4794 case to revert the breakage in their ABI caused by the glibc change.
4796 * Support for file description locks is added to systems running the
4797 Linux kernel. The standard file locking interfaces are extended to
4798 operate on file descriptions, not file descriptors, via the use of
4799 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4800 are associated with an open file instead of a process.
4802 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4804 * The minimum Linux kernel version that this version of the GNU C Library
4805 can be used with is 2.6.32.
4807 * Running the testsuite no longer terminates as soon as a test fails.
4808 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4809 with PASS or FAIL lines for individual tests. A summary of the results is
4810 printed, including a list of failing lists, and "make check" exits with
4811 error status if there were any unexpected failures. "make check
4812 stop-on-test-failure=y" may be used to keep the old behavior.
4814 * The am33 port, which had not worked for several years, has been removed
4817 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4818 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4819 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4820 conflicted with POSIX (support for which was removed in 2.19), the
4821 interfaces those macros enabled remain available when compiling with
4822 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4823 test macros defined.
4825 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4827 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4828 This may improve lock scaling of existing programs on TX capable systems.
4829 The lock elision code is only built with --enable-lock-elision=yes and
4830 then requires a GCC version supporting the TX builtins. With lock elision
4831 default mutexes are elided via __builtin_tbegin, if the cpu supports
4832 transactions. By default lock elision is not enabled and the elision code
4835 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4836 copy the path argument. This allowed programs to cause posix_spawn to
4837 deference a dangling pointer, or use an unexpected pathname argument if
4838 the string was modified after the posix_spawn_file_actions_addopen
4841 * All supported architectures now use the main glibc sysdeps directory
4842 instead of some being in a separate "ports" directory (which was
4843 distributed separately before glibc 2.17).
4845 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4846 On configurations that support it (all Linux configurations), it's now
4847 used regardless of the --enable-add-ons switch to configure. It is no
4848 longer possible to build such configurations without pthreads support.
4850 * Locale names, including those obtained from environment variables (LANG
4851 and the LC_* variables), are more tightly checked for proper syntax.
4852 setlocale will now fail (with EINVAL) for locale names that are overly
4853 long, contain slashes without starting with a slash, or contain ".." path
4854 components. (CVE-2014-0475) Previously, some valid locale names were
4855 silently replaced with the "C" locale when running in AT_SECURE mode
4856 (e.g., in a SUID program). This is no longer necessary because of the
4859 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4860 with application code using Intel MPX instructions. (With all previous
4861 versions, the MPX register state could be clobbered when making calls
4862 into or out of a shared library.) Note that while the new dynamic
4863 linker is compatible with all known x86 hardware whether or not it
4864 supports Intel MPX, some x86 instruction-set emulators might fail to
4865 handle the new instruction encodings. This is known to affect Valgrind
4866 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4867 release), and might affect other tools that do instruction emulation.
4869 * Support for loadable gconv transliteration modules has been removed.
4870 The support for transliteration modules has been non-functional for
4871 over a decade, and the removal is prompted by security defects. The
4872 normal gconv conversion modules are still supported. Transliteration
4873 with //TRANSLIT is still possible, and the //IGNORE specifier
4874 continues to be supported. (CVE-2014-5119)
4876 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4877 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4878 resulting a denial-of-service security vulnerability in applications which
4879 use functions related to iconv. (CVE-2014-6040)
4883 * The following bugs are resolved with this release:
4885 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4886 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4887 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4888 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
4889 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
4890 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
4891 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
4892 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
4893 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
4894 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
4895 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
4896 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
4897 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
4898 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
4899 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
4900 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
4901 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
4902 16431, 16453, 16474, 16506, 16510, 16529
4904 * Slovenian translations for glibc messages have been contributed by the
4905 Translation Project's Slovenian team of translators.
4907 * The public headers no longer use __unused nor __block. This change is to
4908 support compiling programs that are derived from BSD sources and use
4909 __unused internally, and to support compiling with Clang's -fblock
4910 extension which uses __block.
4912 * CVE-2012-4412 The strcoll implementation caches indices and rules for
4913 large collation sequences to optimize multiple passes. This cache
4914 computation may overflow for large collation sequences and may cause a
4915 stack or buffer overflow. This is now fixed to use a slower algorithm
4916 which does not use a cache if there is an integer overflow.
4918 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
4919 rules for large collation sequences to optimize multiple passes and falls
4920 back to alloca if malloc fails, resulting in a possible stack overflow.
4921 The implementation now falls back to an uncached collation sequence lookup
4924 * CVE-2013-4788 The pointer guard used for pointer mangling was not
4925 initialized for static applications resulting in the security feature
4926 being disabled. The pointer guard is now correctly initialized to a
4927 random value for static applications. Existing static applications need
4928 to be recompiled to take advantage of the fix (bug 15754).
4930 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
4931 to the d_name member of struct dirent, or omit the terminating NUL
4932 character. (Bugzilla #14699).
4934 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
4935 aligned_alloc functions could allocate too few bytes or corrupt the
4936 heap when passed very large allocation size values (Bugzilla #15855,
4939 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
4940 for AF_INET6 has been fixed (Bugzilla #16072).
4942 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
4943 pap_CW, quz_PE, the_NP.
4945 * Substantially revised locales: gd_GB, ht_HT
4947 * The LC_ADDRESS field was updated to support country_car for almost all
4950 * ISO 1427 definitions were updated.
4952 * ISO 3166 definitions were updated.
4954 * The localedef utility now supports --big-endian and --little-endian
4955 command-line options to generate locales for a different system from that
4956 for which the C library was built.
4958 * Binary locale files now only depend on the endianness of the system for
4959 which they are generated and not on other properties of that system. As a
4960 consequence, binary files generated with new localedef may be incompatible
4961 with old versions of the GNU C Library, and binary files generated with
4962 old localedef may be incompatible with this version of the GNU C Library,
4963 in the following circumstances:
4965 + Locale files may be incompatible on m68k systems.
4967 + Locale archive files (but not separate files for individual locales) may
4968 be incompatible on systems where plain "char" is signed.
4970 * The configure option --disable-versioning has been removed. Builds with
4971 --disable-versioning had not worked for several years.
4973 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
4974 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
4976 * SystemTap probes for malloc have been introduced.
4978 * SystemTap probes for slow multiple precision fallback paths of
4979 transcendental functions have been introduced.
4981 * Support for powerpc64le has been added.
4983 * The soft-float powerpc port now supports e500 processors.
4985 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
4987 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
4988 set of header declarations that are enabled by default, even when other
4989 feature test macros or compiler options such as -std=c99 would otherwise
4990 disable some of those declarations.
4992 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
4993 conflict with POSIX. The libbsd-compat library (which was a dummy library
4994 that did nothing) has also been removed.
4996 * Preliminary documentation about Multi-Thread, Async-Signal and
4997 Async-Cancel Safety has been added.
4999 * Change of ABI data structures for s390 and s390x:
5000 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5001 allow for future hardware extensions. All library functions that accept or
5002 return these structures were versioned in order to provide backwards
5003 compatibility with existing code. However, not all cases can be handled
5004 with interface versioning. If an application embeds either structure into
5005 another structure and that structure is passed to another compilation unit
5006 which expects the newer larger-sized object then any access to the new
5007 fields will result in undefined behaviour. Similarly any access to fields
5008 that were moved by the enlarging of the structures will cause undefined
5009 behaviour. To fix the undefined behaviour all objects that are part of the
5010 final in-memory image must agree on the size of structures, and this may
5011 require recompilation.
5015 * The following bugs are resolved with this release:
5017 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5018 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5019 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5020 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5021 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5022 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5023 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5024 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5025 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5026 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5027 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5028 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5029 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5032 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5033 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5034 Distributions can re-enable building and using pt_chown via the new configure
5035 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5036 considerable security risks and should only be used if the distribution
5037 understands and accepts the risks.
5039 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5042 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5043 fixed (Bugzilla #15330).
5045 * Add support for calling C++11 thread_local object destructors on thread
5046 and program exit. This needs compiler support for offloading C++11
5047 destructor calls to glibc.
5049 * Improved worst case performance of libm functions with double inputs and
5052 * Support for priority inherited mutexes in pthread condition variables on
5053 non-x86 architectures.
5055 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5057 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5059 * Optimized string functions for ARM. Implemented by Will Newton and
5062 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5064 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5067 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5068 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5070 * Added a benchmark framework to track performance of functions in glibc.
5072 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5073 It is based on draft TS 18661 and currently enabled as a GNU extension.
5075 * On Linux, the clock function now uses the clock_gettime system call
5076 for improved precision, rather than old times system call.
5078 * Added support for version-3 tz format files. This is needed when using
5079 the tz database release 2013e or later, and affects a few unusual cases --
5080 currently only TZ='America/Godthab' for time stamps after 2037.
5082 * Added new API functions pthread_getattr_default_np and
5083 pthread_setattr_default_np to get and set the default pthread
5084 attributes of a process.
5086 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5087 This may improve lock scaling of existing programs on TSX capable systems.
5088 When the --enable-lock-elision=yes parameter is specified at configure
5089 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5092 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5093 availability). Implemented by Ryan S. Arnold.
5095 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5099 * The following bugs are resolved with this release:
5101 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5102 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5103 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5104 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5105 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5106 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5107 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5108 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5109 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5110 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5111 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5112 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5113 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5114 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5115 14879, 14889, 14893, 14898, 14914.
5117 * Optimization of memcpy for MIPS.
5119 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5120 EMFILE has been fixed (Bugzilla #14889).
5122 * The add-on ports collection is now distributed in the "ports" subdirectory
5123 of the main GNU C Library distribution, rather than separately.
5125 * Port to ARM AArch64 contributed by Linaro.
5127 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5128 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5130 Implemented by Andreas Krebbel.
5132 * The new function secure_getenv allows secure access to the environment,
5133 returning NULL if running in a SUID/SGID process. This function replaces
5134 the internal function __secure_getenv.
5136 * SystemTap static probes have been added into the dynamic linker.
5137 Implemented by Gary Benson.
5139 * Optimizations of string functions strstr, strcasestr and memmem.
5140 Implemented by Maxim Kuvyrkov.
5142 * The minimum Linux kernel version that this version of the GNU C Library
5143 can be used with is 2.6.16.
5145 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5146 powerpc POWER7. Implemented by Will Schmidt.
5148 * New configure option --disable-nscd builds the C library such that it
5149 never attempts to contact the Name Service Caching Daemon (nscd).
5150 New configure option --disable-build-nscd avoids building nscd itself;
5151 this is the default if --disable-nscd is used.
5153 * Improved support for cross-compilation, including cross-testing and
5154 bootstrap builds without a previously built glibc.
5156 * Several testsuite tests are now able to test multiple IFUNC variants of an
5157 interface, rather than just testing the one that would be chooen by
5160 * New configure options --with-bugurl and --with-pkgversion, for
5161 distributors to use to embed their bug-reporting and package version
5162 information in --help and --version output.
5164 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5165 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5166 allows creation of chroots without the procfs mounted on /proc.
5168 * The `crypt' function now fails if passed salt bytes that violate the
5169 specification for those values. On Linux, the `crypt' function will
5170 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5171 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5172 when the mode is enabled.
5174 * The `clock_*' suite of functions (declared in <time.h>) is now available
5175 directly in the main C library. Previously it was necessary to link with
5176 -lrt to use these functions. This change has the effect that a
5177 single-threaded program that uses a function such as `clock_gettime' (and
5178 is not linked with -lrt) will no longer implicitly load the pthreads
5179 library at runtime and so will not suffer the overheads associated with
5180 multi-thread support in other code such as the C++ runtime library.
5182 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5187 * The following bugs are resolved with this release:
5189 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5190 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5191 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5192 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5193 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5194 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5195 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5196 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5197 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5198 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5199 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5200 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5201 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5202 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5203 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5204 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5205 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5206 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5207 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5208 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5209 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5210 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5213 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5214 configuring glibc with:
5215 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5216 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5217 Implemented by H.J. Lu.
5221 + define static_assert
5223 + do not declare gets
5225 + declare at_quick_exit and quick_exit also for ISO C11
5227 + aligned_alloc. NB: The code is deliberately allows the size parameter
5228 to not be a multiple of the alignment. This is a moronic requirement
5229 in the standard but it is only a requirement on the caller, not the
5232 + timespec_get added
5234 + uchar.h support added
5236 + CMPLX, CMPLXF, CMPLXL added
5238 Implemented by Ulrich Drepper.
5240 * Support for the IA-64 has been moved to ports.
5242 * Remove support for anything but ELF binary format
5244 * Checking versions of poll, ppoll added.
5245 Implemented by Ulrich Drepper.
5247 * More generic and 64-bit performance optimizations to math functions.
5248 Implemented by Ulrich Drepper.
5250 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5251 headers and functions available at compile time as they were before
5252 version 2.14. This option will be removed at some time in the future
5253 after the TI-RPC library becomes fully sufficient for the needs of
5254 existing applications.
5256 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5257 Note that glibc is not expected to work with any Linux kernel version
5260 * New header <sys/auxv.h> and function getauxval allowing easy access to
5261 the AT_* key-value pairs passed from the Linux kernel. The header also
5262 defines the HWCAP_* bits associated with the AT_HWCAP key.
5264 * New locales: mag_IN
5266 * New configure option --enable-systemtap builds SystemTap static probes
5267 into libc for setjmp and longjmp and into libpthread for various operations.
5268 So far the setjmp/longjmp probes and some of the libpthread probes are
5269 provided only for i*86 and x86_64.
5270 Implemented by Roland McGrath and Rayson Ho.
5272 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5274 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5277 * More optimized functions for SPARC. Implemented by David S. Miller.
5279 * Improved support for cross-compilation, especially bootstrap builds
5280 without a previously built glibc.
5282 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5283 Chris Metcalf from Tilera.
5285 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5286 now supported for ARM processors.
5288 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5289 as the name of the dynamic linker, to distinguish it from the
5290 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5292 * Support for CRIS has been removed from ports.
5294 * A new class of installed header has been documented for low-level
5295 platform-specific functionality. PowerPC added the first instance with a
5296 function to provide time base register access. Contributed by Tulio
5297 Magno Quites Machado Filho.
5299 * ix86 configurations now install header files that are consistent with
5300 what x86-64 configurations install. These same header files can be used
5301 for -m32, -m64, or -mx32 builds.
5302 Contributed by H.J. Lu.
5304 * Math library bug fixes. A thorough audit of all open math library bugs was
5305 conducted by Joseph Myers. Significant progress was made on many math
5306 library bugs resulting in more accurate exceptions and function results.
5307 Many thanks to all those that contributed including Andreas Jaeger for his
5308 patch review and work on the x87 trigonometric instruction issues.
5310 * Timezone data is no longer installed. Timezone-related binaries and scripts
5311 will continue to be installed. Users should obtain their timezone data from
5312 their distribution provider or from the tzdata package at
5313 <ftp://munnari.oz.au/pub/>.
5317 * The following bugs are resolved with this release:
5319 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5320 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5321 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5322 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5323 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5324 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5325 13484, 13506, 13515, 13523, 13524, 13538, 13540
5327 * New program pldd to list loaded object of a process
5328 Implemented by Ulrich Drepper.
5330 * Add nss_db support back to glibc. No more dependency on Berkeley db
5331 and support for initgroups lookups.
5332 Implemented by Ulrich Drepper.
5334 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5335 Contributed by HJ Lu.
5337 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5338 Contributed by HJ Lu.
5340 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5341 on x86-32 and x86-64.
5342 Contributed by Liubov Dmitrieva.
5344 * Optimized strchr and strrchr for SSE on x86-32.
5345 Contributed by Liubov Dmitrieva.
5347 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5348 for x86-64 and x86-32.
5349 Contributed by Liubov Dmitrieva.
5351 * New interfaces: scandirat, scandirat64
5352 Implemented by Ulrich Drepper.
5354 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5355 Implemented by Ulrich Drepper.
5357 * nscd now also caches the netgroup database.
5358 Implemented by Ulrich Drepper.
5360 * Integrate libm with gcc's -ffinite-math-only option.
5361 Implemented by Ulrich Drepper.
5363 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5364 to math functions. Implemented by Ulrich Drepper.
5366 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5367 Implemented by Ulrich Drepper.
5369 * New Linux interfaces: process_vm_readv, process_vm_writev
5371 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5372 Implemented by Ulrich Drepper.
5374 * Optimized nearbyint and strcasecmp for PPC.
5375 Implemented by Adhemerval Zanella.
5377 * New locales: bho_IN, unm_US, es_CU, ta_LK
5381 * The following bugs are resolved with this release:
5383 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5384 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5385 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5386 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5387 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5388 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5389 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5390 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5391 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5392 12795, 12811, 12813, 12814, 12841
5394 * The RPC implementation in libc is obsoleted. Old programs keep working
5395 but new programs cannot be linked with the routines in libc anymore.
5396 Programs in need of RPC functionality must be linked against TI-RPC.
5397 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5399 Visible changes of this change include (obviously) the inability to link
5400 programs using RPC functions without referencing the TI-RPC library and the
5401 removal of the RPC headers from the glibc headers.
5402 Implemented by Ulrich Drepper.
5404 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5405 syncfs, setns, sendmmsg
5407 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5408 yue_HK, lij_IT, mhr_RU
5410 * New encodings: CP770, CP771, CP772, CP773, CP774
5412 * New program sotruss to trace calls through PLTs
5413 Implemented by Ulrich Drepper.
5415 * The malloc hook implementation is marked deprecated and will be removed
5416 from the default implementation in the next version. The design never
5417 worked ever since the introduction of threads. Even programs which do
5418 not create threads themselves can use multiple threads created internally.
5422 * The following bugs are resolved with this release:
5424 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5425 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5426 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5427 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5430 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5432 * POWER7 optimizations: memset, memcmp, strncmp
5434 * New optimized string functions for x86-64: strnlen (SSE2),
5435 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5436 Implemented by Ulrich Drepper.
5440 * The following bugs are resolved with this release:
5442 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5443 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5444 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5445 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5446 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5447 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5448 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5449 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5451 * New interfaces: pthread_getname_np, pthread_setname_np
5453 * New Linux interface: recvmmsg
5455 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5457 * The dynamic linker now recognizes supported ABI versions from the
5458 EI_ABIVERSION field in the ELF header.
5459 Implemented by Ulrich Drepper.
5461 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5462 will not be used to fill in password fields in the passwd.byname replies.
5463 Instead it is used to synthesize the shadow.byname table, should it be
5464 missing. This is a useful mode in some installations involving Solaris.
5465 Implemented by Ulrich Drepper.
5467 * New locales: kok_IN, sq_MK, cv_RU
5471 * The following bugs are resolved with this release:
5473 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5474 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5475 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5476 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5477 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5478 10789, 10817, 10823, 10840, 10847
5480 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5482 Implemented by Ulrich Drepper.
5484 * Checking version of longjmp added that fails if an uninitialized stack
5485 frame would be created. Implemented by Ulrich Drepper.
5487 * STT_GNU_IFUNC is now supported in static executables.
5488 Implemented by H.J. Lu.
5490 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5492 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5493 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5494 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5495 Contributed by H.J. Lu.
5497 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5498 Implemented by Ulrich Drepper.
5500 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5502 Contributed by H.J. Lu.
5504 * Support for fma instruction in AVX on x86-64.
5505 Implemented by H.J. Lu and Ulrich Drepper.
5507 * AVX support in x86-64 auditing support in ld.so.
5508 Implemented by H.J. Lu.
5510 * STB_GNU_UNIQUE support added.
5511 Implemented by Ulrich Drepper.
5513 * Implement second fallback mode for optimized DNS lookup for even more
5514 broken environments. If two requests from the same port are not
5515 handled correctly close the socket and open a new one before sending
5516 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5517 can be used to select this mode right away, instead of rediscovering the
5518 necessity is every process again.
5519 Implemented by Ulrich Drepper.
5521 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5522 Implemented by Adam Tkac.
5524 * Optimized iconv conversions for S390x.
5525 Implemented by Andreas Krebbel.
5527 * Using condvars with PI mutexes is now more efficient due to kernel
5528 support for requeueing to PI futexes. NPTL support added for x86-64.
5529 Implemented by Ulrich Drepper.
5531 * New locales: ps_AF, my_MM
5535 * The following bugs are resolved with this release:
5537 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5538 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5539 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5540 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5541 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5543 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5544 Implemented by Ulrich Drepper.
5546 * New Linux interfaces: accept4, fallocate, fallocate64.
5547 Implemented by Ulrich Drepper.
5549 * Correct declarations of string function when used in C++ code. This
5550 could lead to compile errors for invalid C++ code.
5552 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5555 * New POSIX 2008 interface: psiginfo
5556 Implemented by Ulrich Drepper.
5558 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5559 Implemented by Ulrich Drepper.
5561 * Support for selecting between multiple function definitions at runtime
5562 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5564 * The libcrypt library can now use the hash function implementations in
5565 NSS. Implemented by Ulrich Drepper.
5567 * The malloc implementation can be compiled to be less memory efficient
5568 but higher performing in multi-threaded programs.
5569 Implemented by Ulrich Drepper.
5571 * New locales: nan_TW@latin, ks_IN
5573 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5574 Implemented by Ulrich Drepper.
5576 * Extended printf hook support. It is possible to use user-defined types
5577 and extend existing format specifiers.
5578 Implemented by Ulrich Drepper.
5580 * Handling for group shadow files has been added.
5581 Implemented by Ulrich Drepper.
5583 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5584 servers (the case, e.g., for some people using the built-in DNS
5585 server in ADSL modems/routers). There is a once-per-process timeout
5586 in case of a broken server. To avoid it, users can run nscd or put
5587 'options single-request' in /etc/resolv.conf.
5588 Implemented by Ulrich Drepper.
5592 * The following bugs are resolved with this release:
5594 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5595 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5596 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5597 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5598 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5600 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5601 up at the same time. Implemented by Ulrich Drepper.
5603 * TLS descriptors for LD and GD on x86 and x86-64.
5604 Implemented by Alexandre Oliva.
5606 * getaddrinfo now handles DCCP and UDPlite.
5607 Implemented by Ulrich Drepper.
5609 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5610 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5611 Implemented by Ulrich Drepper.
5613 * New implementation of memmem, strstr, and strcasestr which is O(n).
5614 Implemented by Eric Blake.
5616 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5618 * Implement "e" option for popen to open file descriptor with the
5619 close-on-exec flag set. Implemented by Ulrich Drepper.
5621 * Implement "b" mode for fmemopen. In this mode writes writes don't
5622 implicitly add a NUL byte and seeks from the end of the buffer really
5623 use the buffer end, not the string length as the basis.
5624 Implemented by Ulrich Drepper.
5626 * Many functions, exported and internal, now atomically set the close-on-exec
5627 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5629 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5631 Implemented by Pravin Satpute.
5633 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5637 * The following bugs are resolved with this release:
5639 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5640 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5641 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5642 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5643 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5644 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5645 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5647 * New locales: bo_CN, bo_IN, shs_CA.
5649 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5651 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5652 Implemented by Pravin Satpute.
5654 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5656 * nscd caches now all timeouts for DNS entries
5657 Implemented by Ulrich Drepper.
5659 * nscd is more efficient and wakes up less often.
5660 Implemented by Ulrich Drepper.
5662 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5663 vdprintf, and obstack_vprintf.
5664 Implemented by Jakub Jelinek.
5666 * Faster memset for x86-64.
5667 Implemented by Harsha Jagasia and H.J. Lu.
5669 * Faster memcpy on x86.
5670 Implemented by Ulrich Drepper.
5672 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5673 Implemented by Ulrich Drepper.
5675 * Faster sqrt and sqrtf implemention for some PPC variants.
5676 Implemented by Steven Munroe.
5680 * The following bugs are resolved with this release:
5682 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5683 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5684 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5685 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5686 5071, 5103, 5104, 5112, 5113, 5184, 5186
5688 * More checking functions: fread, fread_unlocked, open*, mq_open.
5689 Implemented by Jakub Jelinek and Ulrich Drepper.
5691 * Extend fortification to C++. Implemented by Jakub Jelinek.
5693 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5694 by not recognizing 'a' as a modifier when those specs are requested.
5695 Implemented by Jakub Jelinek.
5697 * PPC optimizations to math and string functions.
5698 Implemented by Steven Munroe.
5700 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5701 options to be passed. Implemented by Ulrich Drepper.
5703 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5705 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5706 Implemented by Ulrich Drepper.
5708 * Handle private futexes in the NPTL implementation.
5709 Implemented by Jakub Jelinek and Ulrich Drepper.
5711 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5712 Implemented by Roland McGrath and Ulrich Drepper.
5714 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5716 * SHA-256 and SHA-512 based password encryption.
5717 Implemented by Ulrich Drepper.
5719 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5720 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5723 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5724 Implemented by Ulrich Drepper.
5728 * The following bugs are resolved with this release:
5730 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5731 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5732 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5733 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5734 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5735 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5736 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5739 * New Linux interfaces: epoll_pwait, sched_getcpu.
5741 * New generic interfaces: strerror_l.
5743 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5747 * The following bugs are resolved with this release:
5749 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5750 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5751 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5752 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5753 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5754 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5755 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5756 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5757 3225, 3251, 3252, 3253, 3273
5759 * For Linux, the sorting of addresses returned by getaddrinfo now also
5760 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5761 Implemented by Ulrich Drepper.
5763 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5764 Implemented by Ulrich Drepper.
5766 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5768 * New iconv module for MIK. Contributed by Alexander Shopov.
5770 * For sites with broken group and/or passwd database, the auto-propagate
5771 option of nscd can prevent creating ID lookup entries from the results
5772 of a name lookup and vice versa. This usually is no problem but some
5773 site might have problems with the default behavior.
5774 Implemented by Ulrich Drepper.
5776 * Iterating over entire database in NIS can be slow. With the
5777 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5778 to trade time for memory. The entire database will be read at once.
5779 Implemented by Ulrich Drepper.
5781 * The interfaces introduced in RFC 3542 have been implemented by
5784 * Support for the new ELF hash table format was added by Ulrich Drepper.
5786 * Support for priority inheritance mutexes added by Jakub Jelinek and
5789 * Support for priority protected mutexes added by Jakub Jelinek.
5791 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5792 or_IN, csb_PL, fy_NL, sr_ME.
5796 * More overflow detection functions.
5798 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5799 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5801 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5802 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5803 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5804 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5805 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5806 by Masahide Washizawa.
5808 * It is now possible to install audit libraries for the dynamic linker using
5809 LD_AUDIT. Implemented by Ulrich Drepper.
5811 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5812 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5813 For a libc and libpthread that works well on Linux 2.4 kernels, we
5814 recommend using the stable 2.3 branch.
5816 * The new function open_wmemstream acts like open_memstream,
5817 but uses a wchar_t wide character buffer.
5819 * The new function ppoll is an improved version of poll, similar to pselect.
5821 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5822 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5823 renameat, unlinkat, linkat, symlinkat, readlinkat.
5825 * New Linux kernel system calls: unshare,
5826 inotify_init, inotify_add_watch, inotify_rm_watch.
5828 * The euidaccess function is now also known by the alias eaccess,
5829 for compatibility with some other systems.
5831 * Timezone data updated to 2006b version.
5835 * The following bugs are resolved with this release:
5837 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5838 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5839 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5840 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5841 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5842 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5844 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5846 * As of this release, GCC 4 can be used to compile the C Library.
5848 * Timezone data updated to 2005m version.
5852 * The following bugs are resolved with this release:
5854 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5855 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5856 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5857 777, 787, 821, 822, 823, 825
5859 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5863 * Support for RFC 3678. Real implementations exist only for Linux so far.
5864 Implemented by Ulrich Drepper.
5866 * nscd can now cache entries persistently. Expiring entries are reloaded.
5867 For speedups the cache can be shared in memory with client processes.
5868 Implemented by Ulrich Drepper.
5870 * nscd can now perform SELinux checks.
5871 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5873 * getaddrinfo queries are now cached. Canonical name lookup is performed
5875 Implemented by Ulrich Drepper.
5877 * The nothrow function attribute is used when headers are used by gcc when
5878 compiling C code. This can avoid significant amounts of exception
5881 * The malloc functions perform more error checking and are stricter when
5882 it comes to reacting on errors. The default action is to terminate
5883 the process after showing an error message. Implemented by Ulrich Drepper.
5885 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5886 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5888 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
5889 namespaces using the new function dlmopen(). This feature is of course,
5890 like most other dynamic loading functionality, not available in statically
5891 linked applications. Implemented by Ulrich Drepper.
5893 * Low-overhead boundary checking variants of string and some stdio functions
5894 were added. These are to be used in conjunction with a gcc patch by
5895 Jakub Jelinek which adds calls to these functions if possible.
5896 Implemented by Jakub Jelinek and Ulrich Drepper.
5898 * Old code for several operating systems and machine architectures that
5899 have not been in working condition in a long time have been removed from
5900 the main source tree maintained by the GNU C Library's maintainers.
5901 These files are now reside in the separate `ports' source module
5902 that is usable as an add-on when building the library.
5906 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
5907 interrogate the dynamic linker, compatible with the Solaris interface.
5909 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
5910 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
5912 * getifaddrs now uses the netlink interface on Linux to get its information.
5913 Implemented by Thorsten Kukuk.
5915 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
5916 Implemented by Ulrich Drepper.
5918 * support for non-executable stacks on x86 has been added. Changes mostly
5921 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
5924 * getaddrinfo now performs destination address selection according to
5929 * Thread-safe interfaces for many functions that access locale data
5930 were added in version 2.3, but these features were omitted from NEWS.
5931 Many functions have variants with an `_l' suffix that take a `locale_t'
5932 object as a parameter rather than consulting the current locale.
5933 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
5934 create and maintain `locale_t' objects. Additionally, the new function
5935 `uselocale' sets "the current locale" (as used by functions not so
5936 parameterized) set for an individual thread. These features were added
5937 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
5939 * The functions getresuid, getresgid, setresuid, and setresgid, which
5940 have long been available on Linux, are now declared in <unistd.h>
5941 and are now also available on the Hurd.
5943 * ELF thread-local storage support (TLS) now works on x86-64.
5945 * The new dynamic string token $LIB is expanded in shared library names.
5946 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
5948 * Aldy Hernandez contributed complete software floating point support for
5949 PowerPC machines with no FPU.
5951 * fexecve is implemented on Linux.
5953 * The `btowc' function should work at least twice as fast due to
5954 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
5956 * With approriate thread add-ons cancelable functions are now implemented
5957 in libc.so as well. No need to call the function in libpthread. This
5958 change allowed to finally disable the incorrect and expensive handling
5959 of weak definition in ld.so.
5961 * Yet more PLT entries in libc.so have been removed. We finally arrived
5962 at the bare minimum. Startup times improved appropriately.
5964 * Support for the new Linux/x86 system call interface was added. The
5965 AT_SYSINFO auxiliary vector entry is recognized and handled.
5969 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
5972 * iconv (the program and the interface) now accepts empty names (excluding
5973 options like //TRANSLIT) to mean "use charset of current locale".
5975 * localedef can now transliterate characters in strings which are not in
5976 the provided charmap. The information from the input locale is used.
5978 * Prelinking support was added for ELF targets. This requires additional
5979 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
5981 * Read-only stdio streams now use mmap to speed up operation by eliminating
5982 copying and buffer underflows. To use add 'm' to the mode string of
5983 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
5985 * The malloc functions were completely rewritten by Wolfram Gloger based
5986 on Doug Lea's malloc-2.7.0.c.
5988 * Isamu Hasegawa contributed a completely new and POSIX-conformant
5989 implementation of regex.
5991 * Bruno Haible upgraded the iconv and locale implementation to support
5994 * Contents of the LC_* and LANG environment variables in the CEN style are
5995 not recognized anymore. It never was used. Change by Ulrich Drepper.
5997 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
5998 thread-local storage (TLS) ABI on some platforms.
5999 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6001 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6002 EUC-JISX0213, and TSCII.
6004 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6005 BSD-compatible interface for getting all network interface addresses.
6006 Implementation for IPv4 by Roland McGrath.
6008 * Loading of locale data is faster due to the introduction of a locale
6009 archive. Implemented by Roland McGrath and Ulrich Drepper.
6011 * Startup times are significantly reduced by not using exported functions
6012 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6015 * Steven Munroe contributed a port to PowerPC64/Linux.
6019 * The Hurd now uses the GNU libio implementation of stdio rather than the
6020 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6022 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6023 with the same behavior as the Linux system call of the same name.
6027 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6028 128-bit long double format.
6030 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6031 IBM1161, and IBM1162 charsets.
6033 * Andreas Jaeger contributed a port to x86-64/Linux.
6035 * Peter Bruin contributed a port to PowerPC/Hurd.
6037 * libc functions using I/O streams now can handle wide-oriented streams
6040 * optimizations in the dynamic linker. Binaries created by recent binutils
6041 versions start up quicker due to reduced time spent on relocations.
6043 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6047 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6048 asinh, atanh, j0 for the 128-bit long double format.
6050 * Bruno Haible updated all the code handling Unicode in some form to
6051 support Unicode 3.1.
6053 * Speed of regex for single-byte locales is back to previous levels.
6054 Patch by Isamu Hasegawa.
6056 * Alpha, SPARC, and IA-64 now also using floating stacks.
6058 * Startup time of internationalized applications greatly improved through
6059 iconv cache. Use iconvconfig to generate the cache file.
6060 Contributed by Ulrich Drepper.
6062 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6063 severe performance problems. Patch by David Mosberger.
6065 * The Hurd port got a lot more functionality like AIO, various stdio
6066 extensions, etc. Mainly done by Roland McGrath.
6068 * mtrace can now lookup symbols in shared libraries.
6072 * Intel's IA-64 math library is largely integrated. It provides fast and
6073 accurate implementatations for most basic and standard math functions
6074 in float, double, and long double format.
6076 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6077 and asin for the 96-bit long double format and asin, log, tan for the
6078 128-bit long double format.
6080 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6081 The basic double functions exist today. Contributed by Abraham Ziv
6082 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6083 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6085 * An asynchronous name lookup library was added. The interface is designed
6086 after POSIX AIO. The proposal was circulated beforehand to get comments.
6087 No negative ones came in. Implemented by Ulrich Drepper.
6089 * Port to S390/64bit contributed by Martin Schwidefsky
6090 <schwidefsky@de.ibm.com>.
6092 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6093 of functions for Linux/IA-64.
6095 * The RPC code is now thread safe. Threads can now use the same service
6096 of different services at the same time. Patch by Eric Norum
6097 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6099 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6100 family of functions for Linux/S390.
6102 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6103 of functions for Linux/x86.
6105 * Port to Linux/CRIS contributed by Axis Communications.
6109 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6110 we can now check for namespace violations and missing declarations. The
6111 result is that almost all headers are now Unix-compliant (as defined in
6112 the upcoming XPG6). The negative side is that some programs might need
6113 corrections, too, if they depend on the incorrect form of the headers in
6114 previous versions which defined too many symbols and included too many
6117 * regex now handles multibyte character sets correctly.
6118 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6120 * iconv (the program) does now conform to the upcoming XPG6 and handles
6121 charmaps. Instead of the charset names the path of charmaps can be
6122 provided and the conversion happens based on this data.
6123 Contributed by Ulrich Drepper.
6125 * The locale program now provides detailed information about the installed
6130 only lists the names of the supported locales
6134 provides details such as country, language, and codeset name.
6135 Contributed by Ulrich Drepper.
6139 * The gencat program now parses the input file according to the charset
6140 selected by the LC_CTYPE category. This is important for stateful
6141 character sets. To make generating catalogs easier there is a way
6142 to overwrite the charset selected by the locale: before the first
6143 message or $ quote line the catalog can contain a line like
6145 $ codeset=ISO-8859-2
6147 to select the charset (ISO-8859-2 in this case).
6149 Implemented by Shinya Hanataka and Ulrich Drepper.
6151 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6152 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6153 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6155 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6156 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6158 * The LANGUAGE environment variable is now ignored unless the locale is
6159 changed from the default "C" locale.
6161 * The usual bug fixes.
6165 * Greg McGary added runtime support for bounds checking using gcc's
6166 new -fbounded-pointers option. ix86 target is complete. PowerPC
6169 * Thorsten Kukuk added secure mode support to nscd.
6171 * The Berkeley db libraries have been removed.
6173 Related, the nss_db module is now in a separate package since it
6174 obviously requires a database library being available.
6176 * Wide character I/O streams implemented by Ulrich Drepper.
6178 * Functions from the extended socket API added by Ulrich Drepper.
6180 * Functions feenableexcept and fedisableexcept to control the
6181 behaviour of individual exceptions have been added by Andreas Jaeger.
6183 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6185 * The resolver code has been updated from bind 8.2.3-T5B which supports
6186 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6189 This change could in some situations effect backward compatibility. Since
6190 now `_res' is a thread-local instead of a global variable, modifying it
6191 in one thread does not have any effect in other threads.
6193 The resolver library was also extended to allow IPv6 as the transport
6194 protocol for the requests. This work was done by Stig Venaas.
6196 * Compatibility code for K&R C compilers has been removed from the
6197 header files. A ISO C compiler is needed to use the library
6198 (conforming to either C89 or C99 standard).
6200 * Complete rewrite of the localedef program to support multibyte character
6201 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6202 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6203 Implemented by Ulrich Drepper.
6205 Bruno Haible significantly improved the generation and use of the data
6206 structures for the wide character tables.
6208 * Plural handling in gettext implemented by Ulrich Drepper.
6210 * The utmp daemon has been removed.
6212 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6214 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6217 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6219 * POSIX barriers implemented by Kaz Kylheku.
6221 * POSIX spawn function family implemented by Ulrich Drepper.
6223 * POSIX spinlocks are now available.
6225 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6227 * the configure option --enable-kernel=X.Y.Z allows to strip out
6228 compatibility for kernel versions before X.Y.Z. This is currently only
6229 implemented for Linux.
6231 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6232 field sin6_scope_id. This means that all programs using IPv6 should be
6233 recompiled. Don't expect binary compatibility with previous glibc
6236 * various conversion modules for IBM character sets contributed by
6239 * IA-64 port by Jes Sorensen and HJ Lu.
6253 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6255 * New xdr functions are added; some rpc functions are now 64bit clean.
6257 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6259 * Fixed known incompatibilities with glibc 2.0.
6261 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6263 * Optimized a number of functions (especially the ELF dynamic loader).
6265 * Update timezone data files.
6267 * lots of charmaps corrections
6269 * some new locale definitions and charmaps
6274 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6275 conform to POSIX member type requirements. Symbol versions have been
6276 adjusted as needed within the library, and for direct use by applications,
6277 but there is potential for problems if third-party libraries use
6278 struct timeval as part of their interface. This does not present
6279 a problem for X and other "essential" system libraries.
6281 * An additional locale model to support C++ Standard Library locale
6282 model and probably more was implemented by Ulrich Drepper.
6284 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6287 * Miles Bader provided the `argp' function family to support hierachical
6288 command line argument parsing, layered on top of getopt.
6290 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6292 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6295 * scanf recognizes the %a and %A format for scanning floating point numbers.
6297 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6298 information and interfaces for the available integer types.
6300 * about 130 new math functions were added to implement the ISO C9x math
6303 * the new header <complex.h> contains definitions of the complex math
6304 functions from ISO C 9X.
6306 * the new header <tgmath.h> defines generic macros to use complex or
6307 real valued functions.
6309 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6311 * Andreas Jaeger provided a test suite for the math library.
6313 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6315 * Ulrich Drepper added character set conversion functions (iconv).
6317 * Optimized string functions have been added.
6319 * The localedata addon is now part of glibc.
6321 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6323 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6324 daemon for NSS (nscd).
6326 Missing a better place here are some numbers on improvements. Under
6327 Linux 2.1.125 un-tar-ing the kernel sources takes
6331 using local files 12.19s 6.88s 22.91s
6333 using NIS 13.92s 8.91s 26.34s
6335 using NIS & nscd 10.37s 7.34s 25.30s
6337 using NIS+ 27.57s 30.37s 640.46s
6339 using NIS+ & nscd 10.25s 7.83s 26.51s
6341 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6343 Keep in mind that non-namelookup related operations dominate above times.
6344 It was just a common complain that using NIS+ unpacking the kernel is
6347 [1] The old nscd implementation is not available anymore since it was
6348 distributed with glibc up to version 2.0.98 and thus is now replaced.
6350 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6352 * Mark Kettenis provided a Hesiod NSS module.
6354 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6355 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6357 * rcmd can now handle netgroups (Dick Streefland).
6359 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6362 * Support for the IPv6 protocol has been added to the socket API, as per the
6363 latest draft standards.
6365 * Support for Linux 2.2 has been added.
6367 * Interface changes relative to the latest 2.0.x release:
6368 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6369 addseverity NEW: Unix98
6370 alphasort64 NEW: LFS
6371 argp_err_exit_status NEW: argp, GNU ext
6372 argp_error NEW: argp, GNU ext
6373 argp_failure NEW: argp, GNU ext
6374 argp_help NEW: argp, GNU ext
6375 argp_parse NEW: argp, GNU ext
6376 argp_program_bug_address NEW: argp, GNU ext
6377 argp_program_version NEW: argp, GNU ext
6378 argp_program_version_hook NEW: argp, GNU ext
6379 argp_state_help NEW: argp, GNU ext
6380 argp_usage NEW: argp, GNU ext
6381 authdes_create NEW: Secure RPC
6382 authdes_getucred NEW: Secure RPC
6383 authdes_pk_create NEW: Secure RPC
6384 backtrace NEW: GNU ext.
6385 backtrace_symbols NEW: GNU ext.
6386 backtrace_symbols_fd NEW: GNU ext.
6388 cacosf NEW: ISO C 9x
6389 cacosh NEW: ISO C 9x
6390 cacoshf NEW: ISO C 9x
6391 cacoshl NEW: ISO C 9x
6392 cacosl NEW: ISO C 9x
6399 casinf NEW: ISO C 9x
6400 casinh NEW: ISO C 9x
6401 casinhf NEW: ISO C 9x
6402 casinhl NEW: ISO C 9x
6403 casinl NEW: ISO C 9x
6405 catanf NEW: ISO C 9x
6406 catanh NEW: ISO C 9x
6407 catanhf NEW: ISO C 9x
6408 catanhl NEW: ISO C 9x
6409 catanl NEW: ISO C 9x
6410 cbc_crypt NEW: Secure RPC
6414 ccoshf NEW: ISO C 9x
6415 ccoshl NEW: ISO C 9x
6421 cimagf NEW: ISO C 9x
6422 cimagl NEW: ISO C 9x
6423 clearerr_locked REMOVED
6424 clntunix_create NEW: sunrpc ext
6426 clog10 NEW: ISO C 9x
6427 clog10f NEW: ISO C 9x
6428 clog10l NEW: ISO C 9x
6438 cprojf NEW: ISO C 9x
6439 cprojl NEW: ISO C 9x
6441 crealf NEW: ISO C 9x
6442 creall NEW: ISO C 9x
6447 csinhf NEW: ISO C 9x
6448 csinhl NEW: ISO C 9x
6451 csqrtf NEW: ISO C 9x
6452 csqrtl NEW: ISO C 9x
6456 ctanhf NEW: ISO C 9x
6457 ctanhl NEW: ISO C 9x
6459 des_setparity NEW: Secure RPC
6460 ecb_crypt NEW: Secure RPC
6461 endutxent NEW: Unix98
6463 exp10f NEW: ISO C 9x
6464 exp10l NEW: ISO C 9x
6468 fattach NEW: STREAMS
6469 fdetach NEW: STREAMS
6473 feclearexcept NEW: ISO C 9x
6474 fegetenv NEW: ISO C 9x
6475 fegetexceptflag NEW: ISO C 9x
6476 fegetround NEW: ISO C 9x
6477 feholdexcept NEW: ISO C 9x
6479 feraiseexcept NEW: ISO C 9x
6480 ferror_locked REMOVED
6481 fesetenv NEW: ISO C 9x
6482 fesetexceptflag NEW: ISO C 9x
6483 fesetround NEW: ISO C 9x
6484 fetestexcept NEW: ISO C 9x
6485 feupdateenv NEW: ISO C 9x
6486 fflush_locked REMOVED
6490 fgets_unlocked NEW: GNU ext.
6491 fileno_locked REMOVED
6503 fputc_locked REMOVED
6504 fputs_unlocked NEW: GNU ext.
6505 fread_unlocked NEW: GNU ext.
6510 fstatvfs NEW: Unix98
6514 ftruncate64 NEW: LFS
6516 fwrite_unlocked NEW: GNU ext.
6517 gai_strerror NEW: IPv6
6521 getchar_locked REMOVED
6523 getdate_err NEW: Unix98
6524 getdate_r NEW: GNU ext.
6526 getnameinfo NEW: IPv6
6527 getnetname NEW: Secure RPC
6528 getpmsg NEW: STREAMS
6529 getpt NEW: Unix98 PTY
6530 getrlimit64 NEW: LFS
6531 getutxent NEW: Unix98
6532 getutxid NEW: Unix98
6533 getutxline NEW: Unix98
6534 glob64 NEW: GNU ext.
6535 globfree64 NEW: GNU ext.
6536 gnu_get_libc_release NEW: GNU ext.
6537 gnu_get_libc_version NEW: GNU ext.
6538 grantpt NEW: Unix98 PTY
6539 host2netname NEW: Secure RPC
6541 iconv_close NEW: iconv
6542 iconv_open NEW: iconv
6543 if_freenameindex NEW: IPv6
6544 if_indextoname NEW: IPv6
6545 if_nameindex NEW: IPv6
6546 if_nametoindex NEW: IPv6
6547 in6addr_any NEW: IPv6
6548 in6addr_loopback NEW: IPv6
6549 inet6_isipv4mapped NEW: IPv6
6550 isastream NEW: STREAMS
6551 iswblank NEW: GNU ext.
6552 key_decryptsession NEW: Secure RPC
6553 key_decryptsession_pk NEW: Secure RPC
6554 key_encryptsession NEW: Secure RPC
6555 key_encryptsession_pk NEW: Secure RPC
6556 key_gendes NEW: Secure RPC
6557 key_get_conv NEW: Secure RPC
6558 key_secretkey_is_set NEW: Secure RPC
6559 key_setnet NEW: Secure RPC
6560 key_setsecret NEW: Secure RPC
6561 llrint NEW: ISO C 9x
6562 llrintf NEW: ISO C 9x
6563 llrintl NEW: ISO C 9x
6564 llround NEW: ISO C 9x
6565 llroundf NEW: ISO C 9x
6566 llroundl NEW: ISO C 9x
6571 lrintf NEW: ISO C 9x
6572 lrintl NEW: ISO C 9x
6573 lround NEW: ISO C 9x
6574 lroundf NEW: ISO C 9x
6575 lroundl NEW: ISO C 9x
6577 makecontext NEW: Unix98
6578 mempcpy NEW: GNU ext.
6581 modify_ldt NEW: kernel
6585 nearbyint NEW: ISO C 9x
6586 nearbyintf NEW: ISO C 9x
6587 nearbyintl NEW: ISO C 9x
6588 netname2host NEW: Secure RPC
6589 netname2user NEW: Secure RPC
6590 nexttoward NEW: ISO C 9x
6591 nexttowardf NEW: ISO C 9x
6592 nexttowardl NEW: ISO C 9x
6596 passwd2des NEW: Secure RPC
6598 pow10f NEW: GNU ext.
6599 pow10l NEW: GNU ext.
6602 printf_size NEW: GNU ext.
6603 printf_size_info NEW: GNU ext.
6604 profil_counter REMOVED
6605 pthread_mutexattr_getkind_np REPLACED
6606 pthread_mutexattr_setkind_np REPLACED
6607 ptsname NEW: Unix98 PTY
6608 ptsname_r NEW: Unix98 PTY
6610 putchar_locked REMOVED
6611 putgrent NEW: GNU ext.
6613 putpmsg NEW: STREAMS
6614 pututxline NEW: Unix98
6618 readdir64_r NEW: LFS
6619 remquo NEW: ISO C 9x
6620 remquof NEW: ISO C 9x
6621 remquol NEW: ISO C 9x
6623 roundf NEW: ISO C 9x
6624 roundl NEW: ISO C 9x
6626 scalbln NEW: ISO C 9x
6627 scalblnf NEW: ISO C 9x
6628 scalblnl NEW: ISO C 9x
6630 sendfile NEW: kernel
6631 setcontext NEW: Unix98
6632 setrlimit64 NEW: LFS
6633 setutxent NEW: Unix98
6635 sigignore NEW: Unix98
6636 sigqueue NEW: POSIX.1b
6637 sigrelse NEW: Unix98
6638 sigset NEW: POSIX.1b
6639 sigtimedwait NEW: POSIX.1b
6640 sigwaitinfo NEW: POSIX.1b
6641 sincos NEW: GNU ext.
6642 sincosf NEW: GNU ext.
6643 sincosl NEW: GNU ext.
6647 strcasestr NEW: GNU ext.
6648 strtoimax NEW: ISO C 9x
6649 strtoumax NEW: ISO C 9x
6650 strverscmp NEW: GNU ext.
6651 svcauthdes_stats NEW: Secure RPC
6652 svcunix_create NEW: sunrpc etx
6653 svcunixfd_create NEW: sunrpc ext
6654 swapcontext NEW: Unix98
6655 tcgetsid NEW: Unix98 PTY
6656 tdestroy NEW: GNU ext.
6657 tgamma NEW: ISO C 9x
6658 tgammaf NEW: ISO C 9x
6659 tgammal NEW: ISO C 9x
6663 truncf NEW: ISO C 9x
6664 truncl NEW: ISO C 9x
6666 unlockpt NEW: Unix98 PTY
6667 updwtmpx NEW: Unix98
6668 user2netname NEW: Secure RPC
6669 utmpxname NEW: Unix98
6670 versionsort NEW: GNU ext.
6671 versionsort64 NEW: GNU ext.
6673 wcscasecmp NEW: GNU ext.
6674 wcsncasecmp NEW: GNU ext.
6675 wcsnlen NEW: GNU ext.
6676 wcstoimax NEW: ISO C 9x
6677 wcstoll NEW: ISO C 9x
6678 wcstoull NEW: ISO C 9x
6679 wcstoumax NEW: ISO C 9x
6681 wordexp NEW: POSIX.2
6682 wordfree NEW: POSIX.2
6683 write_profiling REMOVED
6684 xdecrypt NEW: Secure RPC
6685 xdr_authdes_cred NEW: Secure RPC
6686 xdr_authdes_verf NEW: Secure RPC
6687 xdr_cryptkeyarg NEW: Secure RPC
6688 xdr_cryptkeyarg2 NEW: Secure RPC
6689 xdr_cryptkeyres NEW: Secure RPC
6690 xdr_getcredres NEW: Secure RPC
6691 xdr_key_netstarg NEW: Secure RPC
6692 xdr_key_netstres NEW: Secure RPC
6693 xdr_keybuf NEW: Secure RPC
6694 xdr_keystatus NEW: Secure RPC
6695 xdr_netnamestr NEW: Secure RPC
6696 xdr_sizeof NEW: Secure RPC
6697 xdr_unixcred NEW: sunrpc ext
6698 xencrypt NEW: Secure RPC
6699 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6710 * inet_ntoa is thread-safe
6712 * updwtmp is moved from libutil to libc
6714 * rewrite of cbrt function
6716 * update of timezone data
6730 * add atoll function
6732 * fix complex problems in Berkeley DB code
6734 * fix math functions
6738 * fixed lots of header problems (especially Linux/GNU specific)
6740 * dynamic loader preserves all registers
6742 * Roland McGrath provided support for handling of auxiliary objects in
6743 the ELF dynamic loader.
6745 * support for parallel builds is improved
6749 * GNU extensions are no longer declared by default. To enable them you
6750 must define the macro `_GNU_SOURCE' in your program or compile with
6753 * The library has changed from using GNU ld symbol aliases to using weak
6754 symbols where available. The ELF object file format supports weak
6755 symbols; GNU ld also supports weak symbols in the a.out format. (There
6756 is also now support for other GNU ld extensions in ELF. Use the
6757 `--with-elf' option to configure to indicate you have ELF, and
6758 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6759 of many files which contained only symbol aliases, reducing the size of
6760 the source and the compiled library; many other files were renamed to
6761 less cryptic names previously occupied by the symbol alias files.
6762 There is a new header file <elf.h> for programs which operate on
6763 files in the ELF format.
6765 * Converted to Autoconf version 2, so `configure' has more options.
6766 Run `configure --help' to see the details.
6768 * The library can now be configured to build profiling, highly-optimized
6769 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6770 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6771 `configure' enable building these extra libraries. The shared library is
6772 built by default when using both ELF and GNU ld. When shared libraries
6773 are enabled, the new library `-ldl' is available for arbitrary run-time
6774 loading of shared objects; its interface is defined in <dlfcn.h>. The
6775 new header file <link.h> gives access to the internals of the run-time
6776 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6777 application of same name on other systems and it provides information
6778 about dynamically linked binaries.
6780 * The C library now provides the run-time support code for profiling
6781 executables compiled with `-pg'. Programs can control the profiling code
6782 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6783 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6784 the support for this file format was contributed by David Mosberger-Tang.
6786 * The math code has been replaced with a math library based on fdlibm from
6787 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6788 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6789 functions. The math functions now reside in a separate library, so
6790 programs using them will need to use `-lm' their linking commands.
6792 * John C. Bowman contributed optimized ix87 assembler inline functions.
6794 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6795 mechanism similar to that found in Solaris 2. This is now used for the
6796 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6797 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6798 file controls what services are used for each individual database. This
6799 works by loading shared libraries with names specified in `nsswitch.conf',
6800 so service modules can be changed or added at any time without even
6801 relinking any program. Currently there are the file, db, and NIS based
6802 NSS services available.
6804 * The new functions `strtoq' and `strtouq' parse integer values from
6805 strings, like `strtol' and `strtoul', but they return `long long int' and
6806 `unsigned long long int' values, respectively (64-bit quantities).
6808 * The new functions `strtof' and `strtold' parse floating-point values from
6809 strings, like `strtod', but they return `float' and `long double' values,
6810 respectively (on some machines `double' and `long double' are the same).
6812 * Ulrich Drepper has contributed new implementations of the floating-point
6813 printing and reading code used in the `printf' family of functions and
6814 `strtod', `strtof', and `strtold'. These new functions are perfectly
6815 accurate, and much faster than the old ones.
6817 * The implementation of the POSIX locale model was completely rewritten by
6818 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6819 to compile the POSIX locale definition.
6821 * The former dummy implementations of the strcoll and strxfrm function are
6822 now replaced by fully functional code contributed by Ulrich Drepper. The
6823 collation information comes from the POSIX locale definitions.
6825 * The new header <langinfo.h> defines an interface for accessing
6826 various locale-dependent data (using the locale chosen with `setlocale').
6828 * Ulrich Drepper has contributed a new suite of functions for operation on
6829 wide-character and multibyte-character strings, in <wchar.h>;
6830 and classification and case conversion of wide characters, in <wctype.h>.
6831 These new functions are conforming to the ISO C, Amendement 1 specification.
6833 * There is now a second implementation of the standard I/O library available.
6834 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6835 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6837 * You can now use positional parameter specifications in format strings
6838 for the `printf' and `scanf' families of functions. For example,
6839 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6840 ``Number 6, Mr Jones''. This is mainly useful when providing different
6841 format strings for different languages, whose grammars may dictate
6842 different orderings of the values being printed. To support this
6843 feature, the interface for `register_printf_handler' has changed; see
6844 the header file <printf.h> for details.
6846 * The `printf' and `scanf' families of functions now understand a new
6847 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6848 to group numbers as indicated by the locale; for `scanf' and friends, this
6849 says to accept as valid only a number with all the proper grouping
6850 separators in the right places. In the default "C" locale, numbers are
6851 not grouped; but locales for specific countries will define the usual
6852 conventions (i.e. separate thousands with `,' in the US locale).
6854 * The pgrp functions have been regularized, slightly incompatibly but much
6855 less confusingly. The core functions are now `getpgid' and `setpgid',
6856 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6857 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6858 provided for compatibility. There is no longer an incompatible `getpgrp'
6859 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6861 * The new header file <fts.h> and suite of functions simplify programs that
6862 operate on directory trees. This code comes from 4.4 BSD.
6864 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6865 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6866 NSS scheme used in glibc.
6868 * There is a new malloc debugging hook `__memalign_hook'.
6870 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6871 `unsigned int' in <sys/types.h>. These are for compatibility only and
6872 their use is discouraged.
6874 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6875 done differently, so that it works even without GNU ld.
6877 * New function `euidaccess' checks allowed access to a file like `access',
6878 but using the effective IDs instead of the real IDs.
6880 * The time zone data files have been updated for the latest and greatest
6881 local time conventions of the countries of the world.
6883 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6886 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6887 for formatting floating-point numbers. They are provided only for
6888 compatibility; new programs should use `sprintf' instead. There are
6889 also equivalent function for the `long double' floating-point type and
6890 all functions also exist in a reentrant form.
6892 * The new auxiliary library `-lutil' from 4.4 BSD contains various
6893 functions for maintaining the login-record files (primarily of use to
6894 system programs such as `login'), and convenient functions for
6895 allocating and initializing a pseudo-terminal (pty) device.
6897 * Ulrich Drepper has contributed new support for System V style
6898 shared memory and IPC on systems that support it.
6900 * Ulrich Drepper has contributed several miscellaneous new functions found
6901 in System V: The `hsearch' family of functions provide an effective
6902 implementation of hash tables; `a64l' and `l64a' provide a very simple
6903 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
6906 * Ulrich Drepper has contributed new reentrant counterparts for the
6907 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
6909 * Ulrich Drepper has contributed new, highly-optimized versions of several
6910 string functions for the i486/Pentium family of processors.
6912 * Ulrich Drepper has updated the Linux-specific code, based largely
6913 on work done in Hongjiu Lu's version of GNU libc for Linux.
6914 The GNU library now supports Linux versions 2.0.10 and later,
6915 using the ELF object file format (i[3456]86-*-linux).
6917 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
6919 * David Mosberger-Tang and Richard Henderson have ported the C library
6920 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
6921 dynamic linking support for ELF/Alpha.
6923 * Richard Henderson contributed several Alpha optimized assembler function
6924 for arithmetic and string handling.
6926 * Ulrich Drepper has contributed a new set of message catalog functions to
6927 support multiple languages using the <libintl.h> interface, for use with
6928 his new package GNU gettext. Translation volunteers have contributed
6929 catalogs of the library's messages in Spanish, German, and Korean.
6931 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
6932 program and the `catgets' function for reading the catalog files it
6933 creates. (The <libintl.h> interface is preferred; we include the
6934 <nl_types.h> interface using `catgets' only for source compatibility with
6935 programs already written to use it.)
6937 * New header file <values.h> gives SVID-compatible names for <limits.h>
6940 * Various new macros, declarations, and small header files for compatibility
6943 * New function `group_member' is a convenient way to check if a process has
6944 a given effective group ID.
6946 * When using GCC 2.7 and later, the socket functions are now declared in a
6947 special way so that passing an argument of type `struct sockaddr_in *',
6948 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
6949 `struct sockaddr *' type, does not generate a type-clash warning.
6951 * New function `error' declared in header file <error.h> is a convenient
6952 function for printing error messages and optionally exiting; this is the
6953 canonical function used in GNU programs. The new functions `err', `warn',
6954 and friends in header file <err.h> are the canonical 4.4 BSD interface for
6955 doing the same thing.
6957 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
6958 POSIX.2 `glob' function to do ~ and {...} expansion.
6960 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
6961 `clearenv' which is used in POSIX.9 is also available.
6963 * New function `getsid' returns session ID number on systems that support it.
6965 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
6966 files <db.h> and <mpool.h> provide a rich set of functions for several
6967 types of simple databases stored in memory and in files, and <ndbm.h> is
6968 an old `ndbm'-compatible interface using the `db' functions. Link with
6969 `-ldb' to get these functions.
6971 * New macro `strdupa' copies a string like `strdup', but uses local stack
6972 space from `alloca' instead of dynamic heap space from `malloc'.
6974 * New function `strnlen' is like `strlen' but searches only a given maximum
6975 number of characters for the null terminator. `stpncpy', `strndup' and
6976 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
6979 * New function `statfs' in header <sys/statfs.h>.
6981 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
6982 provide convenient functions for operating on blocks of null-terminated
6985 * A new suite of functions in <utmp.h> handle all the details of reading
6986 and writing the utmp file.
6988 * An implementation of the NIS/YP(tm) based NSS service was contributed by
6991 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
6992 completely POSIX compliant and also implemented the extended functionality
6993 to handle alternate digit representation and alternate era date formats.
6995 * Ulrich Drepper provided an implementation of the `strptime' function
6996 defined in XPG4.2 which transforms a string into a `struct tm' value.
6998 * Paul Eggert provided the tzselect shell script as part of the timezone
6999 code. The shell script makes it easy to select the correct timezone
7002 * The implementation of the malloc family of functions is completely replaced
7003 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7004 The implementation uses the mmap function (if available) and it is
7005 optimized for the use in multi threaded programs.
7007 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7008 functions. This new functionality is usable by specifying a special
7009 salt string and it is compatible with implementation on *BSD systems.
7011 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7012 `getsubopt' to handle second level command line options, `bsd_signal'
7013 to access BSD style `signal' functionality, the obsolete `regexp' style
7016 * the `lchown' function is available on system which support this
7019 * The implementation of the shadow password handling function was contributed
7022 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7024 * POSIX.1g support was added. The <sys/select.h> header is available,
7025 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7026 implementation of `getaddrinfo'.
7030 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7032 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7033 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7035 * The new function `daemon' from 4.4 BSD is useful for server programs that
7036 want to put themselves in the background.
7038 * Joel Sherrill has contributed support for several standalone boards that
7039 run without an operating system.
7041 * `printf', `scanf' and friends now accept a `q' type modifier for long
7042 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7044 * All of the code taken from BSD (notably most of the math and networking
7045 routines) has been updated from the BSD 4.4-Lite release.
7047 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7049 * The new functions `getdomainname' and `setdomainname' fetch or change the
7050 YP/NIS domain name. These are system calls which exist on systems which
7053 * The time zone data files have been updated for the latest international
7056 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7057 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7061 * The C library now includes support for Sun RPC, from Sun's free
7062 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7063 are included. (There is still no support for YP.)
7065 * Tom Quinn has contributed a port of the C library to SGI machines running
7066 Irix 4 (mips-sgi-irix4).
7068 * The new `lockf' function is a simplified interface to the locking
7069 facilities of `fcntl', included for compatibility.
7071 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7073 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7075 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7078 * The error message printed by `assert' for a failed assertion now includes
7079 the name of the program (if using GNU ld) and the name of the calling
7080 function (with versions of GCC that support this).
7082 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7084 * The library now includes the <sys/mman.h> header file and memory
7085 management functions `mmap', `munmap', `mprotect', `msync', and
7086 `madvise', on systems that support those facilities.
7088 * The interface for `mcheck' has changed slightly: the function called to
7089 abort the program when an allocation inconsistency is detected now takes
7090 an argument that indicates the type of failure. The new function
7091 `mprobe' lets you request a consistency check for a particular block at
7092 any time (checks are normally done only when you call `free' or `realloc'
7095 * It is now possible to easily cross-compile the C library, building on one
7096 system a library to run on another machine and/or operating system. All
7097 you need to do is set the variable `HOST_CC' in `configparms' to the
7098 native compiler for programs to run on the machine you are building on (a
7099 few generator programs are used on Unix systems); set `CC' to the
7102 * The new function `fexecve' (only implemented on the GNU system) executes
7103 a program file given a file descriptor already open on the file.
7107 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7108 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7110 * You can set the variable `libprefix' in `configparms' to specify a prefix
7111 to be prepended to installed library files; this makes it easy to install
7112 the GNU C library to be linked as `-lgnuc' or whatever.
7114 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7115 copies a limited number of characters from a string, and returns the
7116 address of the last character written.
7118 * You no longer need to check for whether the installed `stddef.h' is
7119 compatible with the GNU C library. configure now checks for you.
7121 * You can now define a per-stream `fileno' function to convert the
7122 stream's cookie into an integral file descriptor.
7124 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7125 allocates zero bytes of storage, and returns a unique pointer which
7126 you can pass to `realloc' or `free'. The behavior is undefined if
7127 you dereference this pointer.
7129 * The C library now runs on Sony NEWS m68k machines running either
7130 NewsOS 3 or NewsOS 4.
7132 * The new `syscall' function is a system-dependent primitive function
7133 for invoking system calls. It has the canonical behavior on Unix
7134 systems, including unreliable return values for some calls (such as
7135 `pipe', `fork' and `getppid').
7137 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7138 to `EAGAIN', which is the preferred name. On systems whose kernels
7139 use two distinct codes, the C library now translates EWOULDBLOCK to
7140 EAGAIN in every system call function.
7144 * The GNU C Library Reference Manual is now distributed with the library.
7145 `make dvi' will produce a DVI file of the printed manual.
7146 `make info' will produce Info files that you can read on line using C-h i
7147 in Emacs or the `info' program.
7148 Please send comments on the manual to bug-glibc-manual@gnu.org.
7150 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7152 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7154 * Jason Merrill has contributed a port to the Sequent Symmetry running
7155 Dynix version 3 (i386-sequent-dynix).
7157 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7158 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7160 * New function `memory_warnings' lets you arrange to get warnings when
7161 malloc is running out of memory to allocate, like Emacs gives you.
7163 * The C library now contains the relocating allocator used in Emacs 19 for
7164 its editing buffers. This allocator (ralloc) minimizes allocation
7165 overhead and fragmentation by moving allocated regions around whenever it
7166 needs to. You always refer to a ralloc'd region with a "handle" (a
7167 pointer to a pointer--an object of type `void **').
7169 * There is a new `printf' format: `%m' gives you the string corresponding
7170 to the error code in `errno'.
7172 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7173 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7174 pass, the `a' modifier says to fill in a `char **' you pass with a
7177 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7178 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7179 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7181 * `mkstemp' is a traditional Unix function to atomically create and open a
7182 uniquely-named temporary file.
7186 * The standard location for the file that says what the local timezone is
7187 has changed again. It is now `/usr/local/etc/localtime' (or more
7188 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7190 * The distribution no longer contains any files with names longer than 14
7193 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7194 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7196 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7200 * The configuration process has changed quite a bit. The `configure'
7201 script is now used just like the configuration scripts for other GNU
7202 packages. The `sysdeps' directory hierarchy is much rearranged.
7203 The file `INSTALL' explains the new scheme in detail.
7205 * The header files no longer need to be processed into ANSI C and
7206 traditional C versions. There is just one set of files to install, and
7207 it will work with ANSI or old C compilers (including `gcc -traditional').
7209 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7210 MIPS DECStation running Ultrix 4.
7212 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7213 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7214 made itself into a shared library.
7216 * Yet further improved support for the i386, running 4.3 BSD-like systems
7217 (such as Mach 3 with the Unix single-server), or System V.
7219 * New function `strncasecmp' to do case-insensitive string comparison
7220 with limited length.
7222 * New function `strsep' is a reentrant alternative to `strtok'.
7224 * New functions `scandir' and `alphasort' for searching directories.
7226 * New function `setenv' is a better interface to `putenv'.
7228 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7229 function for traversing a directory tree.
7231 * The GNU obstack package is now also part of the C library.
7232 The new function `open_obstack_stream' creates a stdio stream that
7233 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7234 formatted output directly to an obstack.
7236 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7237 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7239 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7241 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7242 things to your strings.
7244 * There are some new test programs: test-fseek, testmb, and testrand.
7246 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7247 These ports are not finished, but are a good starting place for really
7248 supporting those systems.
7250 * `/etc/localtime' is now the standard location for the file that says what
7251 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7252 This follows the general principle that `/etc' is the place for all local
7253 configuration files.
7255 * The C library header files now use `extern "C"' when used by the C++
7256 compiler, so the C library should now work with C++ code.
7258 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7259 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7262 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7263 function which uses the `merge sort' algorithm, and is said to be
7264 significantly faster than the old GNU `qsort' function. Merge sort is
7265 now the standard `qsort' function. The new algorithm can require a lot
7266 of temporary storage; so, the old sorting function is called when the
7267 required storage is not available.
7269 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7270 provides the Unix `crypt' function, plus some other entry points.
7272 * The code and header files taken from 4.4 BSD have been updated with the
7273 latest files released from Berkeley.
7275 ----------------------------------------------------------------------
7278 Permission is granted to anyone to make or distribute verbatim copies
7279 of this document as received, in any medium, provided that the
7280 copyright notice and this permission notice are preserved,
7281 thus giving the recipient permission to redistribute in turn.
7283 Permission is granted to distribute modified versions
7284 of this document, or of portions of it,
7285 under the above conditions, provided also that they
7286 carry prominent notices stating who last changed them.
7289 version-control: never