1 GNU C Library NEWS -- history of user-visible changes.
2 Copyright (C) 1992-2023 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 * When C2X features are enabled and the base argument is 0 or 2, the
13 following functions support binary integers prefixed by 0b or 0B as
14 input: strtol, strtoll, strtoul, strtoull, strtol_l, strtoll_l,
15 strtoul_l, strtoull_l, strtoimax, strtoumax, strtoq, strtouq, wcstol,
16 wcstoll, wcstoul, wcstoull, wcstol_l, wcstoll_l, wcstoul_l,
17 wcstoull_l, wcstoimax, wcstoumax, wcstoq, wcstouq.
19 Deprecated and removed features, and other changes affecting compatibility:
21 * In the Linux kernel for the hppa/parisc architecture some of the
22 MADV_XXX constants were changed to have the same values as the other
23 architectures. New programs compiled with this glibc version and which
24 use the madvise call will require at least Linux kernel version 6.2,
25 alternatively stable kernels from versions 6.1.6, 5.15.87, 5.10.163,
26 5.4.228, 4.19.270 or 4.14.303.
28 Changes to build and runtime requirements:
30 [Add changes to build and runtime requirements here]
32 Security related changes:
34 CVE-2023-25139: When the printf family of functions is called with a
35 format specifier that uses an <apostrophe> (enable grouping) and a
36 minimum width specifier, the resulting output could be larger than
37 reasonably expected by a caller that computed a tight bound on the
38 buffer size. The resulting larger than expected output could result
39 in a buffer overflow in the printf family of functions.
41 The following bugs are resolved with this release:
43 [The release manager will add the list generated by
44 scripts/list-fixed-bugs.py just before the release.]
50 * The getent tool now supports the --no-addrconfig option. The output of
51 getent with --no-addrconfig may contain addresses of families not
52 configured on the current host i.e. as-if you had not passed
53 AI_ADDRCONFIG to getaddrinfo calls.
55 Deprecated and removed features, and other changes affecting compatibility:
57 * The dynamic linker no longer loads shared objects from the "tls"
58 subdirectories on the library search path or the subdirectory that
59 corresponds to the AT_PLATFORM system name, or employs the legacy AT_HWCAP
60 search mechanism, which was deprecated in version 2.33.
62 Security related changes:
64 CVE-2022-39046: When the syslog function is passed a crafted input
65 string larger than 1024 bytes, it reads uninitialized memory from the
66 heap and prints it to the target log file, potentially revealing a
67 portion of the contents of the heap.
69 The following bugs are resolved with this release:
71 [12154] network: Cannot resolve hosts which have wildcard aliases
72 [12165] libc: readdir: Do not skip entries with zero d_ino values
73 [19444] build: build failures with -O1 due to -Wmaybe-uninitialized
74 [24774] nptl: pthread_rwlock_timedwrlock stalls on ARM
75 [24816] nss: nss/tst-nss-files-hosts-long fails when no interface has
76 AF_INET6 address (ie docker)
77 [27087] stdio: PowerPC: Redefinition error with Clang from IEEE
79 [28846] network: CMSG_NXTHDR may trigger -Wstrict-overflow warning
80 [28937] dynamic-link: New DSO dependency sorter does not put new map
82 [29249] libc: csu/libc-tls.c:202: undefined reference to
83 `_startup_fatal_not_constant'
84 [29305] network: Inefficient buffer space usage in nss_dns for
85 gethostbyname and other functions
86 [29375] libc: don't hide MAP_ANONYMOUS behind _GNU_SOURCE
87 [29402] nscd: nscd: No such file or directory
88 [29415] nscd: getaddrinfo with AI_ADDRCONFIG returns addresses with
90 [29427] dynamic-link: Inconsistency detected by ld.so: dl-printf.c:
91 200: _dl_debug_vdprintf: Assertion `! "invalid format specifier"'
93 [29463] math: math/test-float128-y1 fails on x86_64
94 [29485] build: Make hangs when the test misc/tst-pidfile returns
96 [29490] dynamic-link: [bisected] new __brk_call causes dynamic loader
98 [29499] build: Check failed on misc/tst-glibcsyscalls while building
99 for RISCV64 on a unmatched hardware
100 [29501] build: Check failed on stdlib/tst-strfrom while building for
101 RISCV64 on a unmatched hardware
102 [29502] libc: alpha sys/acct.h out of date
103 [29514] build: Need to use -fPIE not -fpie
104 [29528] dynamic-link: __libc_early_init not called after dlmopen that
106 [29536] libc: syslog fail to create large messages (CVE-2022-39046)
107 [29537] libc: [2.34 regression]: Alignment issue on m68k when using
109 [29539] libc: LD_TRACE_LOADED_OBJECTS changed how vDSO library are
111 [29544] libc: Regression in syslog(3) calls breaks RFC due to extra
113 [29564] build: Incorrect way to change MAKEFLAGS in Makerules
114 [29576] build: librtld.os: in function `_dl_start_profile':
115 (.text+0x9444): undefined reference to `strcpy'
116 [29578] libc: Definition of SUN_LEN() is wrong
117 [29583] build: iconv failures on 32bit platform due to missing large
119 [29600] dynamic-link: dlmopen hangs after loading certain libraries
120 [29604] localedata: Update locale data to Unicode 15.0.0
121 [29605] nscd: Regression in NSCD backend of getaddrinfo
122 [29607] nscd: nscd repeatably crashes calling __strlen_avx2 when hosts
124 [29611] string: Optimized AVX2 string functions unconditionally use
126 [29624] malloc: errno is not cleared when entering main
127 [29638] libc: stdlib: arc4random fallback is never used
128 [29657] libc: Incorrect struct stat for 64-bit time on linux/generic
130 [29698] build: Configuring for AArch32 on ARMv8+ disables
132 [29727] locale: __strtol_internal out-of-bounds read when parsing
134 [29730] libc: broken y2038 support in fstatat on MIPS N64
135 [29746] libc: ppoll() does not switch to __ppoll64 when
136 -D_TIME_BITS=64 and -D_FORTIFY_SOURCE=2 is given on 32bit
137 [29771] libc: Restore IPC_64 support in sysvipc *ctl functions
138 [29780] build: possible parallel make issue in glibc-2.36 (siglist-
139 aux.S: No such file or directory)
140 [29864] libc: __libc_start_main() should obtain program headers
141 address (_dl_phdr) from the auxv, not the ELF header.
142 [29951] time: daylight variable not set correctly if last DST change
143 coincides with offset change
144 [30039] stdio: __vsprintf_internal does not handle unspecified buffer
145 length in fortify mode
151 * Support for DT_RELR relative relocation format has been added to
152 glibc. This is a new ELF dynamic tag that improves the size of
153 relative relocations in shared object files and position independent
154 executables (PIE). DT_RELR generation requires linker support for
155 -z pack-relative-relocs option, which is supported for some targets
156 in recent binutils versions. Lazy binding doesn't apply to DT_RELR.
158 * On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions
159 have been added. The pidfd functionality provides access to a process
160 while avoiding the issue of PID reuse on tranditional Unix systems.
162 * On Linux, the process_madvise function has been added. It has the
163 same functionality as madvise but alters the target process identified
166 * On Linux, the process_mrelease function has been added. It allows a
167 caller to release the memory of a dying process. The release of the
168 memory is carried out in the context of the caller, using the caller's
169 CPU affinity, and priority with CPU usage accounted to the caller.
171 * The “no-aaaa” DNS stub resolver option has been added. System
172 administrators can use it to suppress AAAA queries made by the stub
173 resolver, including AAAA lookups triggered by NSS-based interfaces
174 such as getaddrinfo. Only DNS lookups are affected: IPv6 data in
175 /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
176 produce IPv6 addresses, and configured IPv6 name servers are still
177 used. To produce correct Name Error (NXDOMAIN) results, AAAA queries
178 are translated to A queries. The new resolver option is intended
179 primarily for diagnostic purposes, to rule out that AAAA DNS queries
180 have adverse impact. It is incompatible with EDNS0 usage and DNSSEC
181 validation by applications.
183 * On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,
184 and mount_setattr have been added. They are part of the new Linux kernel
185 mount APIs that allow applications to more flexibly configure and operate
186 on filesystem mounts. The new mount APIs are specifically designed to work
189 * localedef now accepts locale definition files encoded in UTF-8.
190 Previously, input bytes not within the ASCII range resulted in
191 unpredictable output.
193 * Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion
194 functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
195 Support for the char8_t typedef has been added per the ISO C2X N2653
196 proposal. The functions are declared in uchar.h in C2X mode or when the
197 _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
198 The char8_t typedef is declared in uchar.h in C2X mode or when the
199 _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
200 is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).
202 * The functions arc4random, arc4random_buf, and arc4random_uniform have been
203 added. The functions wrap getrandom and/or /dev/urandom to return high-
204 quality randomness from the kernel.
206 * Support for LoongArch running on Linux has been added. This port requires
207 as least binutils 2.38, GCC 12, and Linux 5.19. Currently only hard-float
210 - loongarch64-linux-gnu
212 The LoongArch ABI is 64-bit little-endian.
214 Deprecated and removed features, and other changes affecting compatibility:
216 * Support for prelink will be removed in the next release; this includes
217 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
218 variables and their functionality in the dynamic loader.
220 * The Linux kernel version check has been removed along with the
221 LD_ASSUME_KERNEL environment variable. The minimum kernel used to built
222 glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
223 when libc.so is issued directly.
225 * On Linux, The LD_LIBRARY_VERSION environment variable has been removed.
227 The following bugs are resolved with this release:
229 [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
230 return different result with versioned "foo"
231 [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
233 [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
234 ./exe and ld.so adjusts argv on the stack
235 [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
237 [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
238 consuming the second byte of certain double byte characters
239 [25812] stdio: Libio vtable protection is sometimes only partially
241 [27054] libc: pthread_atfork handlers that call pthread_atfork
243 [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
245 [28128] build: declare_symbol_alias doesn't work for assembly codes
246 [28566] network: getnameinfo with NI_NOFQDN is not thread safe
247 [28752] nss: Segfault in getpwuid when stat fails
248 [28815] libc: realpath should not copy to resolved buffer on error
249 [28828] stdio: fputwc crashes
250 [28838] libc: FAIL: elf/tst-p_align3
251 [28845] locale: ld-monetary.c should be updated to match ISO C and
253 [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
255 [28852] libc: getaddrinfo leaks memory with AI_ALL
256 [28853] libc: tst-spawn6 changes current foreground process group
257 (breaks test isolation)
258 [28857] libc: FAIL: elf/tst-audit24a
259 [28860] build: --enable-kernel=5.1.0 build fails because of missing
260 __convert_scm_timestamps
261 [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
262 inaccurate without /sys and /proc
263 [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
265 [28880] libc: Program crashes if date beyone 2038
266 [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
267 !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
268 [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
269 rtm variants when avoiding overflow
270 [28922] build: The .d dependency files aren't always generated
271 [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
273 [28936] build: nm: No such file
274 [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
275 [28953] nss: NSS lookup result can be incorrect if function lookup
277 [28970] math: benchtest: libmvec benchmark doesn't build with make
279 [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
280 /sys/devices/system/cpu/possible
281 [28993] libc: closefrom() iterates until max int if no access to
283 [28996] libc: realpath fails to copy partial result to resolved buffer
285 [29027] math: [ia64] fabs fails with sNAN input
286 [29029] nptl: poll() spuriously returns EINTR during thread
287 cancellation and with cancellation disabled
288 [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
289 uses of mbsrtowcs (*** buffer overflow detected ***: terminated)
290 [29062] dynamic-link: Memory leak in _dl_find_object_update if object
291 is promoted to global scope
292 [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
293 -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
294 [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
296 [29097] time: fchmodat does not handle 64 bit time_t for
298 [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
300 [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
301 [29162] string: [PATCH] string.h syntactic error:
302 include/bits/string_fortified.h:110: error: expected ',' or ';'
303 before '__fortified_attr_access'
304 [29165] libc: [Regression] broken argv adjustment
305 [29187] dynamic-link: [regression] broken argv adjustment for nios2
306 [29193] math: sincos produces a different output than sin/cos
307 [29197] string: __strncpy_power9() uses uninitialised register vs18
308 value for filling after \0
309 [29203] libc: daemon is not y2038 aware
310 [29204] libc: getusershell is not 2038 aware
311 [29207] libc: posix_fallocate fallback implementation is not y2038
313 [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
314 [29209] libc: isfdtype is not y2038 aware
315 [29210] network: ruserpass is not y2038 aware
316 [29211] libc: __open_catalog is not y2038 aware
317 [29213] libc: gconv_parseconfdir is not y2038 aware
318 [29214] nptl: pthread_setcanceltype fails to set type
319 [29225] network: Mistyped define statement in socket/sys/socket.h in
321 [29274] nptl: __read_chk is not a cancellation point
322 [29279] libc: undefined reference to `mbstowcs_chk' after
323 464d189b9622932a75302290625de84931656ec0
324 [29304] libc: mq_timedreceive does not handle 64 bit syscall return
325 correct for !__ASSUME_TIME64_SYSCALLS
326 [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
327 missing on microblaze with largefile
333 * Unicode 14.0.0 Support: Character encoding, character type info, and
334 transliteration tables are all updated to Unicode 14.0.0, using
335 generator scripts contributed by Mike FABIAN (Red Hat).
337 * Bump r_version in the debugger interface to 2 and add a new field,
338 r_next, support multiple namespaces.
340 * Support for the C.UTF-8 locale has been added to glibc. The locale
341 supports full code-point sorting for all valid Unicode code points. A
342 limitation in the framework for fnmatch, regexec, and regcomp requires
343 a compromise to save space and only ASCII-based range expressions are
344 supported for now (see bug 28255). The full size of the locale is
345 only ~400KiB, with 346KiB coming from LC_CTYPE information for
346 Unicode. This locale harmonizes downstream C.UTF-8 already shipping
347 in various downstream distributions. The locale is not built into
348 glibc, and must be installed.
350 * <math.h> functions that round their results to a narrower type, and
351 corresponding <tgmath.h> macros, are added from TS 18661-1:2014, TS
352 18661-3:2015 and draft ISO C2X:
354 - fsqrt, fsqrtl, dsqrtl and corresponding fMsqrtfN, fMsqrtfNx,
355 fMxsqrtfN and fMxsqrtfNx functions.
357 - ffma, ffmal, dfmal and corresponding fMfmafN, fMfmafNx, fMxfmafN and
360 * <math.h> functions for floating-point maximum and minimum,
361 corresponding to new operations in IEEE 754-2019, and corresponding
362 <tgmath.h> macros, are added from draft ISO C2X: fmaximum,
363 fmaximum_num, fmaximum_mag, fmaximum_mag_num, fminimum, fminimum_num,
364 fminimum_mag, fminimum_mag_num and corresponding functions for float,
365 long double, _FloatN and _FloatNx.
367 * <math.h> macros for single-precision float constants are added as a
368 GNU extension: M_Ef, M_LOG2Ef, M_LOG10Ef, M_LN2f, M_LN10f, M_PIf,
369 M_PI_2f, M_PI_4f, M_1_PIf, M_2_PIf, M_2_SQRTPIf, M_SQRT2f and
372 * The __STDC_IEC_60559_BFP__ and __STDC_IEC_60559_COMPLEX__ macros are
373 predefined as specified in TS 18661-1:2014.
375 * The exp10 functions in <math.h> now have a corresponding type-generic
378 * The ISO C2X macro _PRINTF_NAN_LEN_MAX has been added to <stdio.h>.
380 * printf-family functions now support the %b format for output of
381 integers in binary, as specified in draft ISO C2X, and the %B variant
382 of that format recommended by draft ISO C2X.
384 * A new DSO sorting algorithm has been added in the dynamic linker that uses
385 topological sorting by depth-first search (DFS), solving performance issues
386 of the existing sorting algorithm when encountering particular circular
387 object dependency cases.
389 * A new tunable, glibc.rtld.dynamic_sort, can be used to select between
390 the two DSO sorting algorithms. The default setting of '2' uses the
391 new DFS-based algorithm. The setting '1' switches to the old
392 algorithm used in glibc 2.33 and earlier.
394 * ABI support for a new function '__memcmpeq'. '__memcmpeq' is meant
395 to be used by compilers for optimizing usage of 'memcmp' when its
396 return value is only used for its boolean status.
398 * Support for automatically registering threads with the Linux rseq
399 system call has been added. This system call is implemented starting
400 from Linux 4.18. The Restartable Sequences ABI accelerates user-space
401 operations on per-cpu data. It allows user-space to perform updates
402 on per-cpu data without requiring heavy-weight atomic operations.
403 Automatically registering threads allows all libraries, including
404 libc, to make immediate use of the rseq support by using the
405 documented ABI, via the __rseq_flags, __rseq_offset, and __rseq_size
406 variables. The GNU C Library manual has details on integration of
407 Restartable Sequences.
409 * A symbolic link to the dynamic linker is now installed under
410 /usr/bin/ld.so (or more precisely, '${bindir}/ld.so').
412 * All programs and the testsuite in glibc are now built as position independent
413 executables (PIE) by default on toolchains and architectures that support it.
414 Further, if the toolchain and architecture supports it, even static programs
415 are built as PIE and the resultant glibc can be used to build static PIE
416 executables. A new option --disable-default-pie has been added to disable
417 this behavior and get a non-PIE build. This option replaces
418 --enable-static-pie, which no longer has any effect on the build
421 * On Linux, a new tunable, glibc.malloc.hugetlb, can be used to
422 either make malloc issue madvise plus MADV_HUGEPAGE on mmap and sbrk
423 or to use huge pages directly with mmap calls with the MAP_HUGETLB
424 flags). The former can improve performance when Transparent Huge Pages
425 is set to 'madvise' mode while the latter uses the system reserved
428 * The printf family of functions now handles the flagged %#m conversion
429 specifier, printing errno as an error constant (similar to strerrorname_np).
431 * The function _dl_find_object has been added. In-process unwinders
432 can use it to efficiently locate unwinding information for a code
435 * Support for OpenRISC running on Linux has been added. This port requires
436 as least binutils 2.35, GCC 11, and Linux 5.4. Currently only soft-float
441 The OpenRISC ABI is 32-bit big-endian and uses 64-bit time (y2038 safe) and
442 64-bit file offsets (LFS default).
444 * A new configure option, --with-rtld-early-cflags, can be used to
445 specify additional compiler flags for building the early startup code
446 of the dynamic linker. On targets which have CPU compatibility
447 checks, this can help to ensure that proper diagnostics are printed if
448 the dynamic loader runs on an incompatible CPU.
450 * On Linux, the epoll_pwait2 function has been added. It is similar to
451 epoll_wait with the difference the timeout has nanoseconds resolution.
453 * The function posix_spawn_file_actions_addtcsetpgrp_np has been added,
454 enabling posix_spawn and posix_spawnp to set the controlling terminal in
455 the new process in a race free manner. This function is a GNU extension.
457 * Source fortification (_FORTIFY_SOURCE) level 3 is now available for
458 applications compiling with glibc and gcc 12 and later. Level 3 leverages
459 the __builtin_dynamic_object_size function to deliver additional
460 fortification balanced against additional runtime cost (checking non-constant
463 * The audit libraries will avoid unnecessary slowdown if it is not required
464 PLT tracking (by not implementing the la_pltenter or la_pltexit callbacks).
466 Deprecated and removed features, and other changes affecting compatibility:
468 * On x86-64, the LD_PREFER_MAP_32BIT_EXEC environment variable support
469 has been removed since the first PT_LOAD segment is no longer executable
470 due to defaulting to -z separate-code.
472 * The r_version update in the debugger interface makes the glibc binary
473 incompatible with GDB binaries built without the following commits:
475 c0154a4a21a gdb: Don't assume r_ldsomap when r_version > 1 on Linux
476 4eb629d50d4 gdbserver: Check r_version < 1 for Linux debugger interface
478 when audit modules or dlmopen are used.
480 * Intel MPX support (lazy PLT, ld.so profile, and LD_AUDIT) has been removed.
482 * The --enable-static-pie option is no longer available. The glibc build
483 configuration script now automatically detects static-pie support in the
484 toolchain and architecture and enables it if available.
486 * The catchsegv script and associated libSegFault.so shared object have
487 been removed. There are widely-deployed out-of-process alternatives for
488 catching coredumps and backtraces.
490 * Support for prelink will be removed in the next release; this includes
491 removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
492 variables and their functionality in the dynamic loader.
494 * The LD_TRACE_PRELINKING environment variable has been removed. Similar
495 functionality to obtain the program mapping address can be achieved by
496 using LD_TRACE_LOADED_OBJECTS to value of 2.
498 * The LD_USE_LOAD_BIAS has been removed. The variable was mainly used to
499 support prelink PIE binaries.
501 Changes to build and runtime requirements:
503 * The audit module interface version LAV_CURRENT is increased to enable
504 proper bind-now support. The loader now advertises via the la_symbind
505 flags that PLT trace is not possible. New audit modules require the
506 new dynamic loader supporing the latest LAV_CURRENT version. Old audit
507 modules are still loaded for all targets except aarch64.
509 * The audit interface on aarch64 is extended to support both the indirect
510 result location register (x8) and NEON Q register. Old audit modules are
511 rejected by the loader. Audit modules must be rebuilt to use the newer
512 structure sizes and the latest module interface version for LAV_CURRENT.
514 Security related changes:
516 CVE-2022-23219: Passing an overlong file name to the clnt_create
517 legacy function could result in a stack-based buffer overflow when
518 using the "unix" protocol. Reported by Martin Sebor.
520 CVE-2022-23218: Passing an overlong file name to the svcunix_create
521 legacy function could result in a stack-based buffer overflow.
523 CVE-2021-3998: Passing a path longer than PATH_MAX to the realpath
524 function could result in a memory leak and potential access of
525 uninitialized memory. Reported by Qualys.
527 CVE-2021-3999: Passing a buffer of size exactly 1 byte to the getcwd
528 function may result in an off-by-one buffer underflow and overflow
529 when the current working directory is longer than PATH_MAX and also
530 corresponds to the / directory through an unprivileged mount
531 namespace. Reported by Qualys.
533 The following bugs are resolved with this release:
535 [12889] nptl: Race condition in pthread_kill
536 [14232] nptl: tst-cancel7 and tst-cancelx7 race condition
537 [14913] libc: [mips] Clean up MIPS 64-bit register-dump.h output
538 [15310] dynamic-link: _dl_sort_fini is O(n^3) causing slow exit when
540 [15333] libc: Use 64-bit stat functions in installed programs
541 [15533] dynamic-link: LD_AUDIT introduces an avoidable performance
543 [15971] dynamic-link: No interface for debugger access to libraries
545 [17318] locale: [RFE] Provide a C.UTF-8 locale by default
546 [17645] dynamic-link: RFE: Improve performance of dynamic loader for
547 deeply nested DSO dependencies.
548 [19193] nptl: pthread_kill, pthread_cancel return ESRCH for a thread
549 ID whose lifetime has not ended
550 [22542] network: buffer overflow in sunrpc clnt_create
552 [22716] malloc: [PATCH] mtrace.pl: use TRACE_PRELINKING instead of
554 [25947] malloc: memory leak in muntrace
555 [26045] math: fmaxf(inf, nan) does not always work
556 [26108] math: exp10() has problems with <tgmath.h>
557 [26779] build: benign use after realloc at localealias.c:329
558 [27609] dynamic-link: [2.32/2.33/2.34 Regression] In elf/dl-open.c
559 (_dl_open) we might use __LM_ID_CALLER to index GL(dl_ns)[]
560 [27945] build: build-many-glibcs.py doesn't configure GCC with
561 --enable-initfini-array
562 [27991] build: x86: sysdeps/x86/configure.ac breaks when
563 libc_cv_include_x86_isa_level is loaded from cache
564 [28036] nptl: Incorrect types for pthread_mutexattr_set/getrobust_np
565 in __REDIRECT_NTH macro
566 [28061] dynamic-link: A failing dlmopen called by an auditor crashed
567 [28062] dynamic-link: Suppress audit calls when a (new) namespace is
569 [28126] libc: nftw aborts for paths longer than PATH_MAX
570 [28129] dynamic-link: Unnecessary check DT_DEBUG in ld.so
571 [28153] libc: [test] gmon/tst-gmon-gprof* may have a f3 line when
573 [28182] libc: _TIME_BITS=64 in C++ has issues with fcntl, ioctl, prctl
574 [28185] math: Inaccurate j0f function (again)
575 [28199] locale: iconvconfig prefix flag behaves differently in glibc
577 [28203] dynamic-link: aarch64: elf_machine_{load_address,dynamic}
578 should drop _GLOBAL_OFFSET_TABLE_[0] in favor of __ehdr_start for
580 [28213] librt: NULL pointer dereference in mq_notify (CVE-2021-38604)
581 [28223] libc: mips: clone does not align stack
582 [28253] dynamic-link: Missing colon in LD_SHOW_AUXV output after
584 [28256] malloc: Conditional jump or move depends on uninitialised
585 value(s) in __GI___tunables_init
586 [28260] build: io/tst-closefrom, misc/tst-close_range, posix/tst-
587 spawn5 fail if stray fds are open
588 [28310] libc: Do not use affinity mask for sysconf
589 (_SC_NPROCESSORS_CONF)
590 [28338] time: undefined behavior in __tzfile_compute with oddball TZif
592 [28340] dynamic-link: ld.so crashes while loading a DSO with a read-
594 [28349] libc: Segfault for ping -R on qemux86 caused by recvmsg()
595 [28350] libc: ping receives SIGABRT on lib32-qemux86-64 caused by
597 [28353] network: Race condition on __opensock
598 [28357] dynamic-link: deadlock between pthread_create and ctors
599 [28358] math: f64xdivf128 and f64xmulf128 spurious underflows
600 [28361] nptl: Fix for bug 12889 causes setxid deadlock
601 [28368] build: -Waddress instances in stdio-common/vfprintf-internal.c
602 [28390] localedata: Update locale data to Unicode 14.0.0
603 [28397] math: tgmath.h should not define fmaxmag, fminmag macros for
605 [28400] libc: [2.35 Regression] string/test-strncasecmp: cannot set
607 [28407] nptl: pthread_kill assumes that kill (getpid ()) is equivalent
608 to tgkill (getpid (), gettid())
609 [28455] dynamic-link: -Wl,--enable-new-dtags doesn't work
610 [28457] dynamic-link: Missing reldepmod4.so dependency for
612 [28469] time: linux: struct timex is not correctly set for 32-bit
613 systems with TIMESIZE=64
614 [28470] regex: Buffer read overrun in regular expression searching
615 [28475] string: Incorrect access attribute on memfrob
616 [28524] libc: Conversion from ISO-2022-JP-3 with iconv may emit
617 spurious NUL character on state reset
618 [28532] libc: powerpc64[le]: CFI for assembly templated syscalls is
620 [28550] dynamic-link: FAIL: tst-dso-
621 ordering9_112-ecbda(GLIBC_TUNABLES=glibc.rtld.dynamic_sort=1)
623 [28554] build: Undefined generate-md5
624 [28572] libc: Misaligned accesses in test-memcpy and test-mempcpy on
626 [28607] nptl: Masked signals are delivered on thread exit
627 [28624] libc: openjdk 8/9 assume uni processor and gets stuck due to
628 lack of cpu counting /proc fallback with glibc 2.34
629 [28646] string: [2.35 Regression] mock -r fedora-36-x86_64
630 /tmp/java-1.8.0-openjdk-1.8.0.312.b07-2.fc36.src.rpm& fails to build
631 [28648] dynamic-link: Running ld.so on statically linked binaries
633 [28656] dynamic-link: LD_PREFER_MAP_32BIT_EXEC no longer works due to
635 [28676] dynamic-link: p_align on PT_LOAD segment in DSO isn't honored
636 [28678] nptl: nptl/tst-create1 hangs sporadically
637 [28688] dynamic-link: PT_LOAD p_align check is too strict
638 [28700] nss: "dns [!UNAVAIL=return] files" default for hosts database
640 [28707] time: assert in tzfile.c __tzfile_read striking with truncated
641 timezones generated by tzcode-2021d and later
642 [28713] math: GCC 12 miscompiles libm
643 [28732] dynamic-link: FAIL: elf/tst-dl_find_object
644 [28738] build: LIBC_LINKER_FEATURE doesn't work on linker -z option
645 [28745] dynamic-link: _dl_find_object miscompilation on powerpc64le
646 [28746] libc: _FORTIFY_SOURCE does not work for stpcpy
647 [28749] libc: Inconsistency detected by ld.so: rtld.c: 1632: dl_main:
648 Assertion `GL(dl_rtld_map).l_libname' failed!
649 [28755] string: overflow bug in wcsncmp_avx2 and wcsncmp_evex
650 [28757] nptl: GDB printer tests failed with new GDB
651 [28765] math: x86_64 libmvec atan2 accuracy
652 [28766] manual: Document libmvec accuracy
653 [28768] network: Buffer overflow in svcunix_create with long pathnames
655 [28769] libc: Off-by-one buffer overflow/underflow in getcwd()
657 [28770] libc: Unexpected return value from realpath() for too long
658 results (CVE-2021-3998)
659 [28771] libc: %ebx optimization macros are incompatible with .altmacro
661 [28780] build: --disable-default-pie doesn't work on static programs
662 [28782] libc: x86-64 ISA level for glibc itself is always
664 [28792] glob: possible wrong behaviour with patterns with double [
666 [28837] libc: FAIL: socket/tst-socket-timestamp-compat
667 [28847] locale: Empty mon_decimal_point in LC_MONETARY results in non-
668 empty mon_decimal_point_wc
675 * In order to support smoother in-place-upgrades and to simplify
676 the implementation of the runtime all functionality formerly
677 implemented in the libraries libpthread, libdl, libutil, libanl has
678 been integrated into libc. New applications do not need to link with
679 -lpthread, -ldl, -lutil, -lanl anymore. For backwards compatibility,
680 empty static archives libpthread.a, libdl.a, libutil.a, libanl.a are
681 provided, so that the linker options keep working. Applications which
682 have been linked against glibc 2.33 or earlier continue to load the
683 corresponding shared objects (which are now empty). The integration
684 of those libraries into libc means that additional symbols become
685 available by default. This can cause applications that contain weak
686 references to take unexpected code paths that would only have been
687 used in previous glibc versions when e.g. preloading libpthread.so.0,
688 potentially exposing application bugs.
690 * When _DYNAMIC_STACK_SIZE_SOURCE or _GNU_SOURCE are defined,
691 PTHREAD_STACK_MIN is no longer constant and is redefined to
692 sysconf(_SC_THREAD_STACK_MIN). This supports dynamic sized register
693 sets for modern architectural features like Arm SVE.
695 * Add _SC_MINSIGSTKSZ and _SC_SIGSTKSZ. When _DYNAMIC_STACK_SIZE_SOURCE
696 or _GNU_SOURCE are defined, MINSIGSTKSZ and SIGSTKSZ are no longer
697 constant on Linux. MINSIGSTKSZ is redefined to sysconf(_SC_MINSIGSTKSZ)
698 and SIGSTKSZ is redefined to sysconf (_SC_SIGSTKSZ). This supports
699 dynamic sized register sets for modern architectural features like
702 * The dynamic linker implements the --list-diagnostics option, printing
703 a dump of information related to IFUNC resolver operation and
704 glibc-hwcaps subdirectory selection.
706 * On Linux, the function execveat has been added. It operates similar to
707 execve and it is is already used to implement fexecve without requiring
708 /proc to be mounted. However, different than fexecve, if the syscall is not
709 supported by the kernel an error is returned instead of trying a fallback.
711 * The ISO C2X function timespec_getres has been added.
713 * The feature test macro __STDC_WANT_IEC_60559_EXT__, from draft ISO
714 C2X, is supported to enable declarations of functions defined in Annex F
715 of C2X. Those declarations are also enabled when
716 __STDC_WANT_IEC_60559_BFP_EXT__, as specified in TS 18661-1, is
717 defined, and when _GNU_SOURCE is defined.
719 * On powerpc64*, glibc can now be compiled without scv support using the
720 --disable-scv configure option.
722 * Add support for 64-bit time_t on configurations like x86 where time_t
723 is traditionally 32-bit. Although time_t still defaults to 32-bit on
724 these configurations, this default may change in future versions.
725 This is enabled with the _TIME_BITS preprocessor macro set to 64 and is
726 only supported when LFS (_FILE_OFFSET_BITS=64) is also enabled. It is
727 only enabled for Linux and the full support requires a minimum kernel
730 * The main gconv-modules file in glibc now contains only a small set of
731 essential converter modules and the rest have been moved into a supplementary
732 configuration file gconv-modules-extra.conf in the gconv-modules.d directory
733 in the same GCONV_PATH. Similarly, external converter modules directories
734 may have supplementary configuration files in a gconv-modules.d directory
735 with names ending with .conf to logically classify the converter modules in
738 * On Linux, a new tunable, glibc.pthread.stack_cache_size, can be used
739 to configure the size of the thread stack cache.
741 * The function _Fork has been added as an async-signal-safe fork replacement
742 since Austin Group issue 62 droped the async-signal-safe requirement for
743 fork (and it will be included in the future POSIX standard). The new _Fork
744 function does not run any atfork function neither resets any internal state
745 or lock (such as the malloc one), and only sets up a minimal state required
746 to call async-signal-safe functions (such as raise or execve). This function
747 is currently a GNU extension.
749 * On Linux, the close_range function has been added. It allows efficiently
750 closing a range of file descriptors on recent kernels (version 5.9).
752 * The function closefrom has been added. It closes all file descriptors
753 greater than or equal to a given integer. This function is a GNU extension,
754 although it is also present in other systems.
756 * The posix_spawn_file_actions_addclosefrom_np function has been added,
757 enabling posix_spawn and posix_spawnp to close all file descriptors greater
758 than or equal to a given integer. This function is a GNU extension,
759 although Solaris also provides a similar function.
761 * When invoked explicitly, the dynamic linker now uses the kernel to
762 execute programs that do not have any dynamic dependency (that is,
763 they are statically linked). This feature is Linux-specific.
765 Deprecated and removed features, and other changes affecting compatibility:
767 * The function pthread_mutex_consistent_np has been deprecated; programs
768 should use the equivalent standard function pthread_mutex_consistent
771 * The function pthread_mutexattr_getrobust_np has been deprecated;
772 programs should use the equivalent standard function
773 pthread_mutexattr_getrobust instead.
775 * The function pthread_mutexattr_setrobust_np has been deprecated;
776 programs should use the equivalent standard function
777 pthread_mutexattr_setrobust instead.
779 * The function pthread_yield has been deprecated; programs should use
780 the equivalent standard function sched_yield instead.
782 * The function inet_neta declared in <arpa/inet.h> has been deprecated.
784 * Various rarely-used functions declared in <resolv.h> and
785 <arpa/nameser.h> have been deprecated. Applications are encouraged to
786 use dedicated DNS processing libraries if applicable. For <resolv.h>,
787 this affects the functions dn_count_labels, fp_nquery, fp_query,
788 fp_resstat, hostalias, loc_aton, loc_ntoa, p_cdname, p_cdnname,
789 p_class, p_fqname, p_fqnname, p_option, p_query, p_rcode, p_time,
790 p_type, putlong, putshort, res_hostalias, res_isourserver,
791 res_nameinquery, res_queriesmatch, res_randomid, sym_ntop, sym_ntos,
792 sym_ston. For <arpa/nameser.h>, the functions ns_datetosecs,
793 ns_format_ttl, ns_makecanon, ns_parse_ttl, ns_samedomain, ns_samename,
794 ns_sprintrr, ns_sprintrrf, ns_subdomain have been deprecated.
796 * Various symbols previously defined in libresolv have been moved to libc
797 in order to prepare for libresolv moving entirely into libc (see earlier
798 entry for merging libraries into libc). The symbols __dn_comp,
799 __dn_expand, __dn_skipname, __res_dnok, __res_hnok, __res_mailok,
800 __res_mkquery, __res_nmkquery, __res_nquery, __res_nquerydomain,
801 __res_nsearch, __res_nsend, __res_ownok, __res_query, __res_querydomain,
802 __res_search, __res_send formerly in libresolv have been renamed and no
803 longer have a __ prefix. They are now available in libc.
805 * The pthread cancellation handler is now installed with SA_RESTART and
806 pthread_cancel will always send the internal SIGCANCEL on a cancellation
807 request. It should not be visible to applications since the cancellation
808 handler should either act upon cancellation (if asynchronous cancellation
809 is enabled) or ignore the cancellation internal signal. However there are
810 buggy kernel interfaces (for instance some CIFS versions) that could still
811 see a spurious EINTR error when cancellation interrupts a blocking syscall.
813 * Previously, glibc installed its various shared objects under versioned
814 file names such as libc-2.33.so. The ABI sonames (e.g., libc.so.6)
815 were provided as symbolic links. Starting with glibc 2.34, the shared
816 objects are installed under their ABI sonames directly, without
817 symbolic links. This increases compatibility with distribution
818 package managers that delete removed files late during the package
819 upgrade or downgrade process.
821 * The symbols mallwatch and tr_break are now deprecated and no longer used in
822 mtrace. Similar functionality can be achieved by using conditional
823 breakpoints within mtrace functions from within gdb.
825 * The __morecore and __after_morecore_hook malloc hooks and the default
826 implementation __default_morecore have been removed from the API. Existing
827 applications will continue to link against these symbols but the interfaces
828 no longer have any effect on malloc.
830 * Debugging features in malloc such as the MALLOC_CHECK_ environment variable
831 (or the glibc.malloc.check tunable), mtrace() and mcheck() have now been
832 disabled by default in the main C library. Users looking to use these
833 features now need to preload a new debugging DSO libc_malloc_debug.so to get
834 this functionality back.
836 * The deprecated functions malloc_get_state and malloc_set_state have been
837 moved from the core C library into libc_malloc_debug.so. Legacy applications
838 that still use these functions will now need to preload libc_malloc_debug.so
839 in their environment using the LD_PRELOAD environment variable.
841 * The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
842 __memalign_hook and __free_hook are now removed from the API. Compatibility
843 symbols are present to support legacy programs but new applications can no
844 longer link to these symbols. These hooks no longer have any effect on glibc
845 functionality. The malloc debugging DSO libc_malloc_debug.so currently
846 supports hooks and can be preloaded to get this functionality back for older
847 programs. However this is a transitional measure and may be removed in a
848 future release of the GNU C Library. Users may port away from these hooks by
849 writing and preloading their own malloc interposition library.
851 Changes to build and runtime requirements:
853 * On Linux, the shm_open, sem_open, and related functions now expect the
854 file shared memory file system to be mounted at /dev/shm. These functions
855 no longer search among the system's mount points for a suitable
856 replacement if /dev/shm is not available.
858 Security related changes:
860 CVE-2021-27645: The nameserver caching daemon (nscd), when processing
861 a request for netgroup lookup, may crash due to a double-free,
862 potentially resulting in degraded service or Denial of Service on the
863 local system. Reported by Chris Schanzle.
865 CVE-2021-33574: The mq_notify function has a potential use-after-free
866 issue when using a notification type of SIGEV_THREAD and a thread
867 attribute with a non-default affinity mask.
869 CVE-2021-35942: The wordexp function may overflow the positional
870 parameter number when processing the expansion resulting in a crash.
871 Reported by Philippe Antoine.
873 The following bugs are resolved with this release:
875 [4737] libc: fork is not async-signal-safe
876 [5781] math: Slow dbl-64 sin/cos/sincos for special values
877 [10353] libc: Methods for deleting all file descriptors greater than
878 given integer (closefrom)
879 [14185] glob: fnmatch() fails when '*' wildcard is applied on the file
880 name containing multi-byte character(s)
881 [14469] math: Inaccurate j0f function
882 [14470] math: Inaccurate j1f function
883 [14471] math: Inaccurate y0f function
884 [14472] math: Inaccurate y1f function
885 [14744] nptl: kill -32 $pid or kill -33 $pid on a process cancels a
887 [15271] dynamic-link: dlmopen()ed shared library with LM_ID_NEWLM
888 crashes if it fails dlsym() twice
889 [15648] nptl: multiple definition of `__lll_lock_wait_private'
890 [16063] nptl: Provide a pthread_once variant in libc directly
891 [17144] libc: syslog is not thread-safe if NO_SIGPIPE is not defined
892 [17145] libc: syslog with LOG_CONS leaks console file descriptor
893 [17183] manual: description of ENTRY struct in <search.h> in glibc
895 [18435] nptl: pthread_once hangs when init routine throws an exception
896 [18524] nptl: Missing calloc error checking in
897 __cxa_thread_atexit_impl
898 [19329] dynamic-link: dl-tls.c assert failure at concurrent
899 pthread_create and dlopen
900 [19366] nptl: returning from a thread should disable cancellation
901 [19511] nptl: 8MB memory leak in pthread_create in case of failure
902 when non-root user changes priority
903 [20802] dynamic-link: getauxval NULL pointer dereference after static
905 [20813] nptl: pthread_exit is inconsistent between libc and libpthread
906 [22057] malloc: malloc_usable_size is broken with mcheck
907 [22668] locale: LC_COLLATE: the last character of ellipsis is not
909 [23323] libc: [RFE] CSU startup hardening.
910 [23328] malloc: Remove malloc hooks and ensure related APIs return no
912 [23462] dynamic-link: Static binary with dynamic string tokens ($LIB,
913 $PLATFORM, $ORIGIN) crashes
914 [23489] libc: "gcc -lmcheck" aborts on free when using posix_memalign
915 [23554] nptl: pthread_getattr_np reports wrong stack size with
917 [24106] libc: Bash interpreter in ldd script is taken from host
918 [24773] dynamic-link: dlerror in an secondary namespace does not use
919 the right free implementation
920 [25036] localedata: Update collation order for Swedish
921 [25383] libc: where_is_shmfs/__shm_directory/SHM_GET_NAME may cause
922 shm_open to pick wrong directory
923 [25680] dynamic-link: ifuncmain9picstatic and ifuncmain9picstatic
924 crash in IFUNC resolver due to stack canary (--enable-stack-
926 [26874] build: -Warray-bounds in _IO_wdefault_doallocate
927 [26983] math: [x86_64] x86_64 tgamma has too large ULP error
928 [27111] dynamic-link: pthread_create and tls access use link_map
929 objects that may be concurrently freed by dlclose
930 [27132] malloc: memusagestat is linked to system librt, leading to
931 undefined symbols on major version upgrade
932 [27136] dynamic-link: dtv setup at thread creation may leave an entry
934 [27249] libc: libSegFault.so does not output signal number properly
935 [27304] nptl: pthread_cond_destroy does not pass private flag to futex
937 [27318] dynamic-link: glibc fails to load binaries when built with
938 -march=sandybridge: CPU ISA level is lower than required
939 [27343] nss: initgroups() SIGSEGVs when called on a system without
940 nsswich.conf (in a chroot)
941 [27346] dynamic-link: x86: PTWRITE feature check is missing
942 [27389] network: NSS chroot hardening causes regressions in chroot
944 [27403] dynamic-link: aarch64: tlsdesc htab is not freed on dlclose
945 [27444] libc: sysconf reports unsupported option (-1) for
946 _SC_LEVEL1_ICACHE_LINESIZE on X86 since v2.33
947 [27462] nscd: double-free in nscd (CVE-2021-27645)
948 [27468] malloc: aarch64: realloc crash with heap tagging: FAIL:
949 malloc/tst-malloc-thread-fail
950 [27498] dynamic-link: __dl_iterate_phdr lacks unwinding information
951 [27511] libc: S390 memmove assumes Vector Facility when MIE Facility 3
953 [27522] glob: glob, glob64 incorrectly marked as __THROW
954 [27555] dynamic-link: Static tests fail with --enable-stack-
956 [27559] libc: fstat(AT_FDCWD) succeeds (it shouldn't) and returns
957 information for the current directory
958 [27577] dynamic-link: elf/ld.so --help doesn't work
959 [27605] libc: tunables can't control xsave/xsavec selection in
961 [27623] libc: powerpc: Missing registers in sc[v] clobbers list
962 [27645] libc: [linux] sysconf(_SC_NPROCESSOR...) breaks down on
964 [27646] dynamic-link: Linker error for non-existing NSS symbols (e.g.
965 _nss_files_getcanonname_r) from within a dlmopen namespace.
966 [27648] libc: FAIL: misc/tst-select
967 [27650] stdio: vfscanf returns too early if a match is longer than
969 [27651] libc: Performance regression after updating to 2.33
970 [27655] string: Wrong size calculation in string/test-strnlen.c
971 [27706] libc: select fails to update timeout on error
972 [27709] libc: arm: FAIL: debug/tst-longjmp_chk2
973 [27721] dynamic-link: x86: ld_audit ignores bind now for TLSDESC and
974 tries resolving them lazily
975 [27744] nptl: Support different libpthread/ld.so load orders in
977 [27749] libc: Data race __run_exit_handlers
978 [27761] libc: getconf: Segmentation fault when passing '-vq' as
980 [27832] nss: makedb.c:797:7: error: 'writev' specified size 4294967295
981 exceeds maximum object size 2147483647
982 [27870] malloc: MALLOC_CHECK_ causes realloc(valid_ptr, TOO_LARGE) to
984 [27872] build: Obsolete configure option --enable-stackguard-
986 [27873] build: tst-cpu-features-cpuinfo fail when building on AMD cpu
987 [27882] localedata: Use U+00AF MACRON in more EBCDIC charsets
988 [27892] libc: powerpc: scv ABI error handling fails to check
990 [27896] nptl: mq_notify does not handle separately allocated thread
991 attributes (CVE-2021-33574)
992 [27901] libc: TEST_STACK_ALIGN doesn't work
993 [27902] libc: The x86-64 clone wrapper fails to align child stack
994 [27914] nptl: Install SIGSETXID handler with SA_ONSTACK
995 [27939] libc: aarch64: clone does not align the stack
996 [27968] libc: s390x: clone does not align the stack
997 [28011] libc: Wild read in wordexp (parse_param) (CVE-2021-35942)
998 [28024] string: s390(31bit): Wrong result of memchr (MEMCHR_Z900_G5)
1000 [28028] malloc: malloc: tcache shutdown sequence does not work if the
1001 thread never allocated anything
1002 [28033] libc: Need to check RTM_ALWAYS_ABORT for RTM
1003 [28064] string: x86_64:wcslen implementation list has wcsnlen
1004 [28067] libc: FAIL: posix/tst-spawn5
1005 [28068] malloc: FAIL: malloc/tst-mallocalign1-mcheck
1006 [28071] time: clock_gettime, gettimeofday, time lost vDSO acceleration
1008 [28075] nis: Out-of-bounds static buffer read in nis_local_domain
1009 [28089] build: tst-tls20 fails when linker defaults to --as-needed
1010 [28090] build: elf/tst-cpu-features-cpuinfo-static fails on certain
1012 [28091] network: ns_name_skip may return 0 for domain names without
1020 * The dynamic linker accepts the --list-tunables argument which prints
1021 all the supported tunables. This option is disable if glibc is
1022 configured with tunables disabled (--enable-tunables=no).
1024 * The dynamic linker accepts the --argv0 argument and provides opportunity
1025 to change argv[0] string.
1027 * The dynamic linker loads optimized implementations of shared objects
1028 from subdirectories under the glibc-hwcaps directory on the library
1029 search path if the system's capabilities meet the requirements for
1030 that subdirectory. Initially supported subdirectories include
1031 "power9" and "power10" for the powerpc64le-linux-gnu architecture,
1032 "z13", "z14", "z15" for s390x-linux-gnu, and "x86-64-v2", "x86-64-v3",
1033 "x86-64-v4" for x86_64-linux-gnu. In the x86_64-linux-gnu case, the
1034 subdirectory names correspond to the vendor-independent x86-64
1035 microarchitecture levels defined in the x86-64 psABI supplement.
1037 * The new --help option of the dynamic linker provides usage and
1038 information and library search path diagnostics.
1040 * The mallinfo2 function is added to report statistics as per mallinfo,
1041 but with larger field widths to accurately report values that are
1042 larger than fit in an integer.
1044 * Add <sys/platform/x86.h> to provide query macros for x86 CPU features.
1046 * Support for the RISC-V ISA running on Linux has been expanded to run on
1047 32-bit hardware. This is supported for the following ISA and ABI pairs:
1053 The 32-bit RISC-V port requires at least Linux 5.4, GCC 7.1 and binutils
1056 * A new fortification level _FORTIFY_SOURCE=3 is available. At this level,
1057 glibc may use additional checks that may have an additional performance
1058 overhead. At present these checks are available only on LLVM 9 and later.
1059 The latest GCC available at this time (10.2) does not support this level of
1062 Deprecated and removed features, and other changes affecting compatibility:
1064 * The mallinfo function is marked deprecated. Callers should call
1067 * When dlopen is used in statically linked programs, alternative library
1068 implementations from HWCAP subdirectories are no longer loaded.
1069 Instead, the default implementation is used.
1071 * The deprecated <sys/vtimes.h> header and the function vtimes have been
1072 removed. To support old binaries, the vtimes function continues to exist
1073 as a compatibility symbol. Applications should use the getrlimit or
1076 * Following a change in the tzdata 2018a release upstream, the zdump
1077 program is now installed in the /usr/bin subdirectory. Previously,
1078 the /usr/sbin subdirectory was used.
1080 * On s390(x), the type float_t is now derived from the macro
1081 __FLT_EVAL_METHOD__ that is defined by the compiler, instead of being
1082 hardcoded to double. This does not affect the ABI of any libraries
1083 that are part of the GNU C Library, but may affect the ABI of other
1084 libraries that use this type in their interfaces. The new definition
1085 improves consistency with compiler behavior in many scenarios.
1087 * A future version of glibc will stop loading shared objects from the
1088 "tls" subdirectories on the library search path, the subdirectory that
1089 corresponds to the AT_PLATFORM system name, and also stop employing
1090 the legacy AT_HWCAP search mechanism. Applications should switch to
1091 the new glibc-hwcaps mechanism instead; if they do not do that, only
1092 the baseline version (directly from the search path directory) will be
1095 Changes to build and runtime requirements:
1097 * On Linux, the system administrator needs to configure /dev/pts with
1098 the intended access modes for pseudo-terminals. glibc no longer
1099 attemps to adjust permissions of terminal devices. The previous glibc
1100 defaults ("tty" group, user read/write and group write) already
1101 corresponded to what most systems used, so that grantpt did not
1102 perform any adjustments.
1104 * On Linux, the posix_openpt and getpt functions no longer attempt to
1105 use legacy (BSD) pseudo-terminals and assume that if /dev/ptmx exists
1106 (and pseudo-terminals are supported), a devpts file system is mounted
1107 on /dev/pts. Current systems already meet these requirements.
1109 * s390x requires GCC 7.1 or newer. See gcc Bug 98269.
1111 Security related changes:
1113 CVE-2021-3326: An assertion failure during conversion from the
1114 ISO-20220-JP-3 character set using the iconv function has been fixed.
1115 This assertion was triggered by certain valid inputs in which the
1116 converted output contains a combined sequence of two wide characters
1117 crossing a buffer boundary. Reported by Tavis Ormandy.
1119 CVE-2020-27618: An infinite loop has been fixed in the iconv program when
1120 invoked with input containing redundant shift sequences in the IBM1364,
1121 IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
1123 CVE-2020-29562: An assertion failure has been fixed in the iconv function
1124 when invoked with UCS4 input containing an invalid character.
1126 CVE-2019-25013: A buffer overflow has been fixed in the iconv function when
1127 invoked with EUC-KR input containing invalid multibyte input sequences.
1129 The following bugs are resolved with this release:
1131 [10635] libc: realpath portability patches
1132 [16124] dynamic-link: ld.so should allow to change argv[0]
1133 [17924] malloc: 'free' should not set errno
1134 [18683] libc: Linux faccessat implementation can incorrectly ignore
1136 [22899] libc: Use 64-bit readdir() in generic POSIX getcwd()
1137 [23091] hurd: missing waitid support
1138 [23249] libc: Epyc and other current AMD CPUs do not select the
1139 "haswell" platform subdirectory
1140 [24080] dynamic-link: Definition of "haswell" platform is inconsistent
1142 [24202] libc: m68k setjmp() saves incorrect 'a5' register in --enable-
1144 [24941] libc: Make grantpt usable after multi-threaded fork in more
1146 [24970] libc: realpath mishandles EOVERFLOW; stat not needed anyway
1147 [24973] locale: iconv encounters segmentation fault when converting
1148 0x00 0xfe in EUC-KR to UTF-8 (CVE-2019-25013)
1149 [25399] string: undefined reference to `__warn_memset_zero_len' when
1150 changing gnuc version
1151 [25859] libc: glibc parser for /sys/devices/system/cpu/online is
1153 [25938] dynamic-link: ld.so.cache should store meaning of hwcap mask
1155 [25971] libc: s390 bits/hwcap.h out of sync with kernel
1156 [26053] libc: unlockpt fails with ENOTTY for non-ptmx descriptors
1157 [26100] libc: Race in syslog(3) with regards to tag printing.
1158 [26124] libc: Export <cpu-features.h>
1159 [26130] nscd: Inconsistent nscd cache during pruning
1160 [26203] libc: GLRO(dl_x86_cpu_features) may not be intialized
1161 [26224] locale: iconv hangs when converting some invalid inputs from
1162 several IBM character sets (CVE-2020-27618)
1163 [26341] libc: realpath cyclically call __alloca(path_max) to consume
1164 too much stack space
1165 [26343] manual: invalid documented return type for strerrorname_np(),
1166 strerrordesc_np(), sigdescr_np(), sigabbrev_np()
1167 [26376] libc: Namespace violation in stdio.h and sys/stat.h if build
1169 [26383] locale: bind_textdomain_codeset doesn't accept //TRANSLIT
1171 [26394] time: [2.33 Regression] FAIL: nptl/tst-join14
1172 [26534] math: libm.so 2.32 SIGILL in pow() due to FMA4 instruction on
1174 [26552] dynamic-link: CPU_FEATURE_USABLE_P should be more conservative
1175 [26553] libc: mtx_init allows type set to "mtx_recursive" only
1176 [26555] string: strerrorname_np does not return the documented value
1177 [26592] libc: pointer arithmetic overflows in realpath
1178 [26600] network: Transaction ID collisions cause slow DNS lookups in
1180 [26606] libc: [2.33 Regression] pselect is broken on x32
1181 [26615] libc: powerpc: libc segfaults when LD_PRELOADed with libgcc
1182 [26620] glob: fnmatch with collating symbols results in segmentation
1184 [26625] libc: [2.33 Regression] CET is disabled
1185 [26636] libc: 32-bit shmctl(IPC_INFO) crashes when shminfo struct is
1186 at the end of a memory mapping
1187 [26637] libc: semctl SEM_STAT_ANY fails to pass the buffer specified
1188 by the caller to the kernel
1189 [26639] libc: msgctl IPC_INFO and MSG_INFO return garbage
1190 [26647] build: [-Werror=array-parameter=] due to different
1191 declarations for __sigsetjmp
1192 [26648] libc: mkstemp is likely to fail on systems with non-stricly-
1194 [26649] stdio: printf should handle non-normal x86 long double numbers
1195 gracefully (CVE-2020-29573)
1196 [26686] build: -Warray-parameter instances building with GCC 11
1197 [26687] build: -Warray-bounds instances building with GCC 11
1198 [26690] stdio: Aliasing violation in __vfscanf_internal
1199 [26691] nptl: Use a minimum guard size of 64 KiB on aarch64
1200 [26726] build: GCC warning calling new_composite_name with an array of
1202 [26736] libc: FAIL: misc/tst-sysvshm-linux
1203 [26737] libc: Random FAIL: rt/tst-shm
1204 [26791] libc: Missing O_CLOEXEC in sysconf.c
1205 [26798] dynamic-link: aarch64: variant PCS symbols may be incorrectly
1207 [26801] nptl: pthread_mutex_clocklock with CLOCK_MONOTONIC can fail on
1209 [26818] string: aarch64: string tests may run ifunc variants that are
1211 [26821] libc: Memory leak test failures on Fedora 33
1212 [26824] libc: FAIL: elf/tst-cpu-features-supports with recent trunk:
1213 FSGSBASE/LM/RDRAND check failure
1214 [26833] time: adjtime() with delta == NULL segfaults on armv7 32bit
1216 [26853] libc: aarch64: Missing unwind information in statically linked
1218 [26923] locale: Assertion failure in iconv when converting invalid
1219 UCS4 (CVE-2020-29562)
1220 [26926] dynamic-link: aarch64: library dependencies are not bti
1222 [26932] libc: sh: Multiple floating point functions defined as stubs
1224 [26964] nptl: pthread_mutex_timedlock returning EAGAIN after futex is
1226 [26988] dynamic-link: aarch64: BTI mprotect address is not page
1228 [27002] build: libc_freeres_fn build failure with GCC 11
1229 [27004] dynamic-link: ld.so is miscompiled by GCC 11
1230 [27008] dynamic-link: ld.so.cache should have endianness markup
1231 [27042] libc: [alpha] anonymous union in struct stat confuses
1233 [27053] libc: Conformance regression in system(3) (and probably also
1235 [27072] dynamic-link: static pie ifunc resolvers run before hwcap is
1237 [27077] network: Do not reload /etc/nsswitch.conf from chroot
1238 [27083] libc: Unsafe unbounded alloca in addmntent
1239 [27104] dynamic-link: The COMMON_CPUID_INDEX_MAX handshake does not
1241 [27130] string: "rep movsb" performance issue
1242 [27150] libc: alpha: wait4() is unavailable in static linking
1243 [27177] dynamic-link:
1244 GLIBC_TUNABLES=glibc.cpu.x86_ibt=on:glibc.cpu.x86_shstk=on doesn't
1246 [27222] dynamic-link: Incorrect sysdeps/x86/tst-cpu-features-cpuinfo.c
1247 [27237] malloc: deadlock in malloc/tst-malloc-stats-cancellation
1248 [27256] locale: Assertion failure in ISO-2022-JP-3 gconv module
1249 related to combining characters (CVE-2021-3326)
1256 * Unicode 13.0.0 Support: Character encoding, character type info, and
1257 transliteration tables are all updated to Unicode 13.0.0, using
1258 generator scripts contributed by Mike FABIAN (Red Hat).
1260 * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq)
1262 * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been
1263 added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1.
1264 Three ABIs are supported:
1270 The arc* ABIs are little-endian while arceb is big-endian. All ABIs use
1271 64-bit time (y2038 safe) and 64-bit file offsets (LFS default).
1273 * The GNU C Library now loads audit modules listed in the DT_AUDIT and
1274 DT_DEPAUDIT dynamic section entries of the main executable.
1276 * powerpc64le supports IEEE128 long double libm/libc redirects when
1277 using -mabi=ieeelongdouble to compile C code on supported GCC
1278 toolchains. It is recommended to use GCC 8 or newer when testing
1281 * To help detect buffer overflows and other out-of-bounds accesses
1282 several APIs have been annotated with GCC 'access' attribute. This
1283 should help GCC 10 issue better warnings.
1285 * On Linux, functions pthread_attr_setsigmask_np and
1286 pthread_attr_getsigmask_np have been added. They allow applications
1287 to specify the signal mask of a thread created with pthread_create.
1289 * The GNU C Library now provides the header file <sys/single_threaded.h>
1290 which declares the variable __libc_single_threaded. Applications are
1291 encouraged to use this variable for single-thread optimizations,
1292 instead of weak references to symbols historically defined in
1295 * The functions sigabbrev_np and sigdescr_np have been added. The
1296 sigabbrev_np function returns the abbreviated signal name (e.g. "HUP" for
1297 SIGHUP) while sigdescr_np returns a string describing the signal number
1298 (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not
1299 attempt to translate the return description, both functions return
1300 NULL for an invalid signal number.
1302 They should be used instead of sys_siglist or sys_sigabbrev and they
1303 are both thread and async-signal safe. These functions are GNU extensions.
1305 * The functions strerrorname_np and strerrordesc_np have been added. The
1306 strerroname_np function returns error number name (e.g. "EINVAL" for EINVAL)
1307 while strerrordesc_np returns a string describing the error number
1308 (e.g "Invalid argument" for EINVAL). Different than strerror,
1309 strerrordesc_np does not attempt to translate the return description, both
1310 functions return NULL for an invalid error number.
1312 They should be used instead of sys_errlist and sys_nerr, both are
1313 thread and async-signal safe. These functions are GNU extensions.
1315 * AArch64 now supports standard branch protection security hardening
1316 in glibc when it is built with a GCC that is configured with
1317 --enable-standard-branch-protection (or if -mbranch-protection=standard
1318 flag is passed when building both GCC target libraries and glibc,
1319 in either case a custom GCC is needed). This includes branch target
1320 identification (BTI) and pointer authentication for return addresses
1321 (PAC-RET). They require armv8.5-a and armv8.3-a architecture
1322 extensions respectively for the protection to be effective,
1323 otherwise the used instructions are nops. User code can use PAC-RET
1324 without libc support, but BTI requires a libc that is built with BTI
1325 support, otherwise runtime objects linked into user code will not be
1328 Deprecated and removed features, and other changes affecting compatibility:
1330 * Remove configure option --enable-obsolete-rpc. Sun RPC is removed
1331 from glibc. This includes the rpcgen program, librpcsvc, and the Sun
1332 RPC header files. Backward compatibility for old programs is kept
1333 only for architectures and ABIs that have been added in or before
1334 glibc 2.31. New programs need to use TI-RPC
1335 <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and
1336 rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>.
1338 * Remove configure option --enable-obsolete-nsl. libnsl is only built
1339 as shared library for backward compatibility and the NSS modules "nis"
1340 and "nisplus" are not built at all and libnsl's headers aren't
1341 installed. This compatibility is kept only for architectures and ABIs
1342 that have been added in or before version 2.28. Replacement
1343 implementations based on TI-RPC, which additionally support IPv6, are
1344 available from <https://github.com/thkukuk/>. This change does not
1345 affect the "compat" NSS module, which does not depend on libnsl
1346 since 2.27 and thus can be used without NIS.
1348 * The deprecated <sys/sysctl.h> header and the sysctl function have been
1349 removed. To support old binaries, the sysctl function continues to
1350 exist as a compatibility symbol (on those architectures which had it),
1351 but always fails with ENOSYS. This reflects the removal of the system
1352 call from all architectures, starting with Linux 5.5.
1354 * The sstk function is no longer available to newly linked binaries.
1355 Its implementation always returned with a failure, and the function
1356 was not declared in any header file.
1358 * The legacy signal handling functions siginterrupt, sigpause, sighold,
1359 sigrelse, sigignore and sigset, and the sigmask macro have been
1360 deprecated. Applications should use the sigsuspend, sigprocmask and
1361 sigaction functions instead.
1363 * ldconfig now defaults to the new format for ld.so.cache. glibc has
1364 already supported this format for almost 20 years.
1366 * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev
1367 are no longer available to newly linked binaries, and their declarations
1368 have been removed from <string.h>. They are exported solely as
1369 compatibility symbols to support old binaries. All programs should use
1372 * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr
1373 are no longer available to newly linked binaries, and their declarations
1374 have been removed from <stdio.h>. They are exported solely as
1375 compatibility symbols to support old binaries. All programs should use
1376 strerror or strerror_r instead.
1378 * Both strerror and strerror_l now share the same internal buffer in the
1379 calling thread, meaning that the returned string pointer may be invalided
1380 or contents might be overwritten on subsequent calls in the same thread or
1381 if the thread is terminated. It makes strerror MT-safe.
1383 * Using weak references to libpthread functions such as pthread_create
1384 or pthread_key_create to detect the singled-threaded nature of a
1385 program is an obsolescent feature. Future versions of glibc will
1386 define pthread_create within libc.so.6 itself, so such checks will
1387 always flag the program as multi-threaded. Applications should check
1388 the __libc_single_threaded variable declared in
1389 <sys/single_threaded.h> instead.
1391 * The "files" NSS module no longer supports the "key" database (used for
1392 secure RPC). The contents of the /etc/publickey file will be ignored,
1393 regardless of the settings in /etc/nsswitch.conf. (This method of
1394 storing RPC keys only supported the obsolete and insecure AUTH_DES
1395 flavor of secure RPC.)
1397 * The __morecore and __after_morecore_hook malloc hooks and the default
1398 implementation __default_morecore have been deprecated. Applications
1399 should use malloc interposition to change malloc behavior, and mmap to
1400 allocate anonymous memory. A future version of glibc may require that
1401 applications which use the malloc hooks must preload a special shared
1402 object, to enable the hooks.
1404 * The hesiod NSS module has been deprecated and will be removed in a
1405 future version of glibc. System administrators are encouraged to
1406 switch to other approaches for networked account databases, such as
1409 Changes to build and runtime requirements:
1411 * powerpc64le requires GCC 7.4 or newer. This is required for supporting
1412 long double redirects.
1414 Security related changes:
1416 CVE-2016-10228: An infinite loop has been fixed in the iconv program when
1417 invoked with the -c option and when processing invalid multi-byte input
1418 sequences. Reported by Jan Engelhardt.
1420 CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack
1421 corruption when they were passed a pseudo-zero argument. Reported by Guido
1422 Vranken / ForAllSecure Mayhem.
1424 CVE-2020-1752: A use-after-free vulnerability in the glob function when
1425 expanding ~user has been fixed.
1427 CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and
1428 memmove functions has been fixed. Discovered by Jason Royes and Samual
1429 Dytrych of the Cisco Security Assessment and Penetration Team (See
1432 The following bugs are resolved with this release:
1434 [9809] localedata: ckb_IQ: new Kurdish Sorani locale
1435 [10441] manual: Backtraces code example lacks error checking
1436 [10815] librt: [timer_create / SIGEV_THREAD] signalmask of
1437 timer_sigev_thread dangerous
1438 [14231] stdio: stdio-common tests memory requirements
1439 [14578] libc: /proc-based emulation for lchmod, fchmodat
1440 [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if
1441 filtee has constructor
1442 [19519] locale: iconv(1) with -c option hangs on illegal multi-byte
1443 sequences (CVE-2016-10228)
1444 [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML
1445 character entities for infinity & pi
1446 [20338] libc: Parsing of /etc/gshadow can return bad pointers causing
1447 segfaults in applications
1448 [20543] libc: Please move from .gnu.linkonce to comdat
1449 [22489] network: gcc warns about implicit convertion in
1450 ICMP6_FILTER_SETPASS with -Wsign-conversion
1451 [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1"
1452 [23294] math: Complex _FloatN functions are redirected to the wrong
1453 function with -mlong-double-64
1454 [23296] libc: Data race in setting function descriptor during lazy
1456 [23668] dynamic-link: ldconfig: Default to the new format for
1458 [23819] hurd: hurd: Add C11 thread support
1459 [23990] build: test-container error out on failure to exec child.
1460 [23991] build: shell-container typo in run_command_array
1461 [24638] manual: Error in example of parsing a template string
1462 [24654] manual: Wrong declaration of wcschr in libc manual
1463 [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic
1465 [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for
1466 dynamically loaded dsos
1467 [25098] nptl: nptl: ctype classification functions are not AS-Safe
1468 [25219] libc: improve out-of-bounds checking with GCC 10 attribute
1470 [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and
1471 restore EAX, ECX and EDX
1472 [25397] dynamic-link: Legacy bitmap doesn't cover jitted code
1473 [25414] glob: 'glob' use-after-free bug (CVE-2020-1752)
1474 [25420] network: Race condition in resolv_conf.c can result in caching
1475 stale configuration forever
1476 [25487] math: sinl() stack corruption from crafted input
1478 [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC
1480 [25523] libc: MIPS/Linux inline syscall template is miscompiled
1481 [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy()
1483 [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31
1484 on 32 bit and old kernel
1485 [25635] libc: arm: Wrong sysdep order selection for soft-fp
1486 [25639] localedata: Some names of days and months wrongly spelt in
1488 [25657] libc: sigprocmask() and sigisemptyset() manipulate different
1489 amount of sigset_t bytes
1490 [25691] stdio: printf: memory leak when printing long multibyte
1492 [25715] libc: system() returns wrong errors when posix_spawn fails
1493 [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0
1494 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion
1495 state for conversions that produce two Unicode code points
1496 [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel
1497 for linux x86_64 leads to livelock
1498 [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes
1499 test failures, invalid instruction in ld.so
1500 [25790] glob: Typo in tst-fnmatch.input
1501 [25810] libc: x32: Incorrect syscall entries with pointer, off_t and
1503 [25819] localedata: Update locale data to Unicode 13.0.0
1504 [25824] libc: Abnormal function of strnlen in aarch64
1505 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1]
1506 [25896] libc: Incorrect prctl
1507 [25902] libc: Bad LOADARGS_N
1508 [25905] dynamic-link: VSX registers are corrupted during PLT
1509 resolution when glibc is built with --disable-multi-arch and --with-
1511 [25933] string: Off by one error in __strncmp_avx2 when
1512 length=VEC_SIZE*4 and strings are at page boundaries can cause a
1514 [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and
1515 exiting detached thread
1516 [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold
1518 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding
1520 [25999] nptl: Use-after-free issue in pthread_getaddr_default_np
1521 [26073] math: getpayload() has wrong return value
1522 [26076] dynamic-link: dlmopen crashes after failing to load
1523 dependencies in audit mode
1524 [26120] localedata: column width of of some Korean
1525 JUNGSEONG/JONGSEONG characters wrong (should be 0)
1526 [26128] libc: Incorrect bit_cpu_CLFLUSHOPT
1527 [26133] libc: Incorrect need_arch_feature_F16C
1528 [26137] libc: strtod() triggers exception FE_INEXACT on reasonable
1530 [26149] libc: PKU is usable only if OSPKE is set
1531 [26173] libc: powerpc64*: Add @notoc to calls to functions that do not
1533 [26208] libc: Incorrect bit_cpu_CLFSH
1534 [26210] network: Incorrect use of hidden symbols for global sunrpc
1536 [26211] stdio: printf integer overflow calculating allocation size
1537 [26214] stdio: printf_fp double free
1538 [26215] stdio: printf_fp memory leak
1539 [26232] time: FAIL: support/tst-timespec for 32-bit targets
1540 [26258] nss: nss_compat should not read input files with mmap
1541 [26332] string: Incorrect cache line size load causes memory
1542 corruption in memset
1549 * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to
1550 enable features from the draft ISO C2X standard. Only some features from
1551 this draft standard are supported by the GNU C Library, and as the draft
1552 is under active development, the set of features enabled by this macro is
1553 liable to change. Features from C2X are also enabled by _GNU_SOURCE, or
1554 by compiling with "gcc -std=gnu2x".
1556 * The <math.h> functions that round their results to a narrower type now
1557 have corresponding type-generic macros in <tgmath.h>, as defined in TS
1558 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of
1559 Clarification Request 13 to TS 18661-3.
1561 * The function pthread_clockjoin_np has been added, enabling join with a
1562 terminated thread with a specific clock. It allows waiting against
1563 CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension.
1565 * New locale added: mnw_MM (Mon language spoken in Myanmar).
1567 * The DNS stub resolver will optionally send the AD (authenticated data) bit
1568 in queries if the trust-ad option is set via the options directive in
1569 /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this
1570 mode, the AD bit, as provided by the name server, is available to
1571 applications which call res_search and related functions. In the default
1572 mode, the AD bit is not set in queries, and it is automatically cleared in
1573 responses, indicating a lack of DNSSEC validation. (Therefore, the name
1574 servers and the network path to them are treated as untrusted.)
1576 Deprecated and removed features, and other changes affecting compatibility:
1578 * The totalorder and totalordermag functions, and the corresponding
1579 functions for other floating-point types, now take pointer arguments to
1580 avoid signaling NaNs possibly being converted to quiet NaNs in argument
1581 passing. This is in accordance with the resolution of Clarification
1582 Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass
1583 floating-point arguments directly will continue to work.
1585 * The obsolete function stime is no longer available to newly linked
1586 binaries, and its declaration has been removed from <time.h>.
1587 Programs that set the system time should use clock_settime instead.
1589 * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>,
1590 in a future version of glibc. In this release, the header still exists
1591 but calling ftime will cause a compiler warning. All programs should use
1592 gettimeofday or clock_gettime instead.
1594 * The gettimeofday function no longer reports information about a
1595 system-wide time zone. This 4.2-BSD-era feature has been deprecated for
1596 many years, as it cannot handle the full complexity of the world's
1597 timezones, but hitherto we have supported it on a best-effort basis.
1598 Changes required to support 64-bit time_t on 32-bit architectures have
1599 made this no longer practical.
1601 As of this release, callers of gettimeofday with a non-null 'tzp' argument
1602 should expect to receive a 'struct timezone' whose tz_minuteswest and
1603 tz_dsttime fields are zero. (For efficiency reasons, this does not always
1604 happen on a few Linux-based ports. This will be corrected in a future
1607 All callers should supply a null pointer for the 'tzp' argument to
1608 gettimeofday. For accurate information about the time zone associated
1609 with the current time, use the localtime function.
1611 gettimeofday itself is obsolescent according to POSIX. We have no plans
1612 to remove access to this function, but portable programs should consider
1613 using clock_gettime instead.
1615 * The settimeofday function can still be used to set a system-wide time
1616 zone when the operating system supports it. This is because the Linux
1617 kernel reused the API, on some architectures, to describe a system-wide
1618 time-zone-like offset between the software clock maintained by the kernel,
1619 and the "RTC" clock that keeps time when the system is shut down.
1621 However, to reduce the odds of this offset being set by accident,
1622 settimeofday can no longer be used to set the time and the offset
1623 simultaneously. If both of its two arguments are non-null, the call
1624 will fail (setting errno to EINVAL).
1626 Callers attempting to set this offset should also be prepared for the call
1627 to fail and set errno to ENOSYS; this already happens on the Hurd and on
1628 some Linux architectures. The Linux kernel maintainers are discussing a
1629 more principled replacement for the reused API. After a replacement
1630 becomes available, we will change settimeofday to fail with ENOSYS on all
1631 platforms when its 'tzp' argument is not a null pointer.
1633 settimeofday itself is obsolescent according to POSIX. Programs that set
1634 the system time should use clock_settime and/or the adjtime family of
1635 functions instead. We may cease to make settimeofday available to newly
1636 linked binaries after there is a replacement for Linux's time-zone-like
1639 * SPARC ISA v7 is no longer supported. v8 is still supported, but only if
1640 the optional CAS instruction is implemented (for instance, LEON processors
1641 are still supported, but SuperSPARC processors are not).
1643 As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit
1646 * If a lazy binding failure happens during dlopen, during the execution of
1647 an ELF constructor, the process is now terminated. Previously, the
1648 dynamic loader would return NULL from dlopen, with the lazy binding error
1649 captured in a dlerror message. In general, this is unsafe because
1650 resetting the stack in an arbitrary function call is not possible.
1652 * For MIPS hard-float ABIs, the GNU C Library will be configured to need an
1653 executable stack unless explicitly configured at build time to require
1654 minimum kernel version 4.8 or newer. This is because executing
1655 floating-point branches on a non-executable stack on Linux kernels prior to
1656 4.8 can lead to application crashes for some MIPS configurations. While
1657 currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are
1658 expected to enable non-executable stack by default with PT_GNU_STACK by
1659 default and is thus likely to trigger a crash on older kernels.
1661 The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a
1662 non-executable stack while dropping support for older kernels.
1664 * System call wrappers for time system calls now use the new time64 system
1665 calls when available. On 32-bit targets, these wrappers attempt to call
1666 the new system calls first and fall back to the older 32-bit time system
1667 calls if they are not present. This may cause issues in environments
1668 that cannot handle unsupported system calls gracefully by returning
1669 -ENOSYS. Seccomp sandboxes are affected by this issue.
1671 Changes to build and runtime requirements:
1673 * It is no longer necessary to have recent Linux kernel headers to build
1674 working (non-stub) system call wrappers on all architectures except 64-bit
1675 RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0.
1677 * The ChangeLog file is no longer present in the toplevel directory of the
1678 source tree. ChangeLog files are located in the ChangeLog.old directory as
1679 ChangeLog.N where the highest N has the latest entries.
1681 Security related changes:
1683 CVE-2020-1751: A defect in the PowerPC backtrace function could cause an
1684 out-of-bounds write when executed in a signal frame context.
1686 CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC
1687 environment variable during program execution after a security
1688 transition, allowing local attackers to restrict the possible mapping
1689 addresses for loaded libraries and thus bypass ASLR for a setuid
1690 program. Reported by Marcin Kościelnicki.
1692 The following bugs are resolved with this release:
1694 [12031] localedata: iconv -t ascii//translit with Greek characters
1695 [15813] libc: Multiple issues in __gen_tempname
1696 [17726] libc: [arm, sparc] profil_counter should be compat symbol
1697 [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h
1698 [19767] libc: vdso is not used with static linking
1699 [19903] hurd: Shared mappings not being inherited by children processes
1700 [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD
1701 [20839] dynamic-link: Incomplete rollback of dynamic linker state on
1703 [23132] localedata: Missing transliterations in Miscellaneous Mathematical
1704 Symbols-A/B Unicode blocks
1705 [23518] libc: Eliminate __libc_utmp_jump_table
1706 [24026] malloc: malloc_info() returns wrong numbers
1707 [24054] localedata: Many locales are missing date_fmt
1708 [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode
1709 [24304] dynamic-link: Lazy binding failure during ELF
1710 constructors/destructors is not fatal
1711 [24376] libc: RISC-V symbol size confusion with _start
1712 [24682] localedata: zh_CN first weekday should be Monday per GB/T
1714 [24824] libc: test-in-container does not install charmap files compatible
1716 [24844] regex: regex bad pointer / leakage if malloc fails
1717 [24867] malloc: Unintended malloc_info formatting changes
1718 [24879] libc: login: utmp alarm timer can arrive after lock acquisition
1719 [24880] libc: login: utmp implementation uses struct flock with fcntl64
1720 [24882] libc: login: pututline uses potentially outdated cache
1721 [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h>
1722 [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale
1724 [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to
1726 [24930] dynamic-link: dlopen of PIE executable can result in
1727 _dl_allocate_tls_init assertion failure
1728 [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC
1729 (stringop-overflow error)
1730 [24959] time: librt IFUNC resolvers for clock_gettime and clock_*
1731 functions other can lead to crashes
1732 [24967] libc: jemalloc static linking causes runtime failure
1733 [24986] libc: alpha: new getegid, geteuid and getppid syscalls used
1735 [25035] libc: sbrk() failure handled poorly in tunables_strdup
1736 [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement
1737 [25097] libc: new -Warray-bounds with GCC 10
1738 [25112] dynamic-link: dlopen must not make new objects accessible when it
1739 still can fail with an error
1740 [25139] localedata: Please add the new mnw_MM locale
1741 [25149] regex: Array bounds violation in proceed_next_node
1742 [25157] dynamic-link: Audit cookie for the dynamic loader is not
1743 initialized correctly
1744 [25189] libc: glibc's __glibc_has_include causes issues with clang
1746 [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt
1747 value to an unsigned
1748 [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid
1749 binaries (CVE-2019-19126)
1750 [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf-
1752 [25226] string: strstr: Invalid result if needle crosses page on s390-z15
1754 [25232] string: <string.h> does not enable const correctness for strchr et
1756 [25233] localedata: Consider "." as the thousands separator for sl_SI
1758 [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86
1759 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG.
1760 [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling
1762 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M"
1763 [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time
1765 [25396] dynamic-link: Failing dlopen can leave behind dangling GL
1766 (dl_initfirst) link map pointer
1767 [25401] malloc: pvalloc must not have __attribute_alloc_size__
1768 [25423] libc: Array overflow in backtrace on powerpc
1769 [25425] network: Missing call to __resolv_context_put in
1770 getaddrinfo.c:gethosts
1777 * Unicode 12.1.0 Support: Character encoding, character type info, and
1778 transliteration tables are all updated to Unicode 12.1.0, using
1779 generator scripts contributed by Mike FABIAN (Red Hat).
1781 * The dynamic linker accepts the --preload argument to preload shared
1782 objects, in addition to the LD_PRELOAD environment variable.
1784 * The twalk_r function has been added. It is similar to the existing
1785 twalk function, but it passes an additional caller-supplied argument
1786 to the callback function.
1788 * On Linux, the getdents64, gettid, and tgkill functions have been added.
1790 * Minguo (Republic of China) calendar support has been added as an
1791 alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
1794 * The entry for the new Japanese era has been added for ja_JP locale.
1796 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
1797 pvalloc, memalign, and posix_memalign fail now with total object size
1798 larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with
1799 pointer subtraction within the allocated object, where results might
1800 overflow the ptrdiff_t type.
1802 * The dynamic linker no longer refuses to load objects which reference
1803 versioned symbols whose implementation has moved to a different soname
1804 since the object has been linked. The old error message, symbol
1805 FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with
1806 link time reference, is gone.
1808 * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock,
1809 pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait
1810 functions. These behave similarly to their "timed" equivalents, but also
1811 accept a clockid_t parameter to determine which clock their timeout should
1812 be measured against. All functions allow waiting against CLOCK_MONOTONIC
1813 and CLOCK_REALTIME. The decision of which clock to be used is made at the
1814 time of the wait (unlike with pthread_condattr_setclock, which requires
1815 the clock choice at initialization time).
1817 * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still
1818 work, new resolvers can use a second argument which can be extended in
1819 the future, currently it contains the AT_HWCAP2 value.
1821 Deprecated and removed features, and other changes affecting compatibility:
1823 * The copy_file_range function fails with ENOSYS if the kernel does not
1824 support the system call of the same name. Previously, user space
1825 emulation was performed, but its behavior did not match the kernel
1826 behavior, which was deemed too confusing. Applications which use the
1827 copy_file_range function can no longer rely on glibc to provide a fallback
1828 on kernels that do not support the copy_file_range system call, and if
1829 this function returns ENOSYS, they will need to use their own fallback.
1830 Support for copy_file_range for most architectures was added in version
1831 4.5 of the mainline Linux kernel.
1833 * The functions clock_gettime, clock_getres, clock_settime,
1834 clock_getcpuclockid, clock_nanosleep were removed from the librt library
1835 for new applications (on architectures which had them). Instead, the
1836 definitions in libc will be used automatically, which have been available
1839 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
1840 and <sys/stropts.h> have been removed.
1842 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
1843 resolver flag (deprecated in glibc 2.25) have been removed.
1845 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
1846 resolver have been removed from <resolv.h>.
1848 * With --enable-bind-now, installed programs are now linked with the
1851 * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe*
1852 configurations) has been removed, following the deprecation of this
1853 subarchitecture in version 8 of GCC, and its removal in version 9.
1855 * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h>
1856 header have been removed.
1858 * The Linux-specific <sys/sysctl.h> header and the sysctl function have been
1859 deprecated and will be removed from a future version of glibc.
1860 Application should directly access /proc instead. For obtaining random
1861 bits, the getentropy function can be used.
1863 Changes to build and runtime requirements:
1865 * GCC 6.2 or later is required to build the GNU C Library.
1867 Older GCC versions and non-GNU compilers are still supported when
1868 compiling programs that use the GNU C Library.
1870 Security related changes:
1872 CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
1873 size. For x86-64, memcmp on an object size larger than SSIZE_MAX
1874 has undefined behavior. On x32, the size_t argument may be passed
1875 in the lower 32 bits of the 64-bit RDX register with non-zero upper
1876 32 bits. When it happened with the sign bit of RDX register set,
1877 memcmp gave the wrong result since it treated the size argument as
1878 zero. Reported by H.J. Lu.
1880 CVE-2019-9169: Attempted case-insensitive regular-expression match
1881 via proceed_next_node in posix/regexec.c leads to heap-based buffer
1882 over-read. Reported by Hongxu Chen.
1884 The following bugs are resolved with this release:
1886 [2872] locale: Transliteration Cyrillic -> ASCII fails
1887 [6399] libc: gettid() should have a wrapper
1888 [16573] malloc: mtrace hangs when MALLOC_TRACE is defined
1889 [16976] glob: fnmatch unbounded stack VLA for collating symbols
1890 [17396] localedata: globbing for locale by [[.collating-element.]]
1891 [18035] dynamic-link: pldd does no longer work, enters infinite loop
1892 [18465] malloc: memusagestat is built using system C library
1893 [18830] locale: iconv -c -f ascii with >buffer size worth of input before
1894 invalid input drops valid char
1895 [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash
1896 [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8
1897 [21897] localedata: Afar locales: Fix mon, abmon, and abday
1898 [22964] localedata: The Japanese Era name will be changed on May 1, 2019
1899 [23352] malloc: __malloc_check_init still defined in public header
1901 [23403] nptl: Wrong alignment of TLS variables
1902 [23501] libc: nftw() doesn't return dangling symlink's inode
1903 [23733] malloc: Check the count before calling tcache_get()
1904 [23741] malloc: Missing __attribute_alloc_size__ in many allocation
1906 [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep
1907 [23844] nptl: pthread_rwlock_trywrlock results in hang
1908 [23983] argparse: Missing compat versions of argp_failure and argp_error
1909 for long double = double
1910 [23984] libc: Missing compat versions of err.h and error.h functions for
1911 long double = double
1912 [23996] localedata: Dutch salutations
1913 [24040] libc: riscv64: unterminated call chain in __thread_start
1914 [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid
1916 [24051] stdio: puts and putchar output to _IO_stdout instead of stdout
1917 [24059] nss: nss_files: get_next_alias calls fgets_unlocked without
1919 [24114] regex: regexec buffer read overrun in "grep -i
1920 '\(\(\)*.\)*\(\)\(\)\1'"
1921 [24122] libc: Segfaults if 0 returned from la_version
1922 [24153] stdio: Some input functions do not react to stdin assignment
1923 [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in
1924 RDX is set) (CVE-2019-7309)
1925 [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2
1926 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm,
1927 not the default "nor"
1928 [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN
1929 false positives, change to modern flexible array
1930 [24180] nptl: pthread_mutex_trylock does not use the correct order of
1931 instructions while maintaining the robust mutex list due to missing
1933 [24194] librt: Non-compatibility symbols for clock_gettime etc. cause
1934 unnecessary librt dependencies
1935 [24200] localedata: Revert first_weekday removal in en_IE locale
1936 [24211] nptl: Use-after-free in Systemtap probe in pthread_join
1937 [24215] nptl: pthread_timedjoin_np should be a cancellation point
1938 [24216] malloc: Check for large bin list corruption when inserting
1940 [24228] stdio: old x86 applications that use legacy libio crash on exit
1941 [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through
1943 [24293] localedata: Missing Minguo calendar support for TW locales
1944 [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in
1945 tt_RU (Tatar) locale
1946 [24307] localedata: Update locale data to Unicode 12.0.0
1947 [24323] dynamic-link: dlopen should not be able open PIE objects
1948 [24335] build: "Obsolete types detected" with Linux 5.0 headers
1949 [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in
1950 tt_RU (Tatar) locale
1951 [24370] localedata: Add lang_name for tt_RU locale
1952 [24372] locale: Binary locale files are not architecture independent
1953 [24394] time: strptime %Ey mis-parses final year of era
1954 [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror
1956 [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in-
1958 [24531] malloc: Malloc tunables give tcache assertion failures
1959 [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit
1961 [24535] localedata: Update locale data to Unicode 12.1.0
1962 [24537] build: nptl/tst-eintr1 test case can hit task limits on some
1963 kernels and break testing
1964 [24544] build: elf/tst-pldd doesn't work if you install with a --prefix
1965 [24556] build: [GCC 9] error: ‘%s’ directive argument is null
1966 [-Werror=format-overflow=]
1967 [24570] libc: alpha: compat msgctl uses __IPC_64
1968 [24584] locale: Data race in __wcsmbs_clone_conv
1969 [24588] stdio: Remove codecvt vtables from libio
1970 [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with
1972 [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35
1973 [24632] stdio: Old binaries which use freopen with default stdio handles
1975 [24640] libc: __ppc_get_timebase_freq() always return 0 when using static
1977 [24652] localedata: szl_PL spelling correction
1978 [24695] nss: nss_db: calling getpwent after endpwent crashes
1979 [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry
1980 in /etc/nsswitch.conf
1981 [24699] libc: mmap64 with very large offset broken on MIPS64 n32
1982 [24740] libc: getdents64 type confusion
1983 [24741] dynamic-link: ld.so should not require that a versioned symbol is
1984 always implemented in the same library
1985 [24744] libc: Remove copy_file_range emulation
1986 [24757] malloc: memusagestat is linked against system libpthread
1987 [24794] libc: Partial test suite run builds corrupt test-in-container
1995 * The getcpu wrapper function has been added, which returns the currently
1996 used CPU and NUMA node. This function is Linux-specific.
1998 * A new convenience target has been added for distribution maintainers
1999 to build and install all locales as directories with files. The new
2000 target is run by issuing the following command in your build tree:
2001 'make localedata/install-locale-files', with an optional DESTDIR
2002 to set the install root if you wish to install into a non-default
2003 configured location.
2005 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
2007 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
2008 for _GNU_SOURCE, to match BSD environments.
2010 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
2011 indicates that it will abort the transaction prior to entering the kernel
2012 (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is
2013 suspended, and this caused some undefined side-effects issues by aborting
2014 transactions manually. Glibc avoided it by abort transactions manually on
2015 each syscall, but it lead to performance issues on newer kernels where the
2016 HTM state is saved and restore lazily (the state being saved even when the
2017 process actually does not use HTM).
2019 * The functions posix_spawn_file_actions_addchdir_np and
2020 posix_spawn_file_actions_addfchdir_np have been added, enabling
2021 posix_spawn and posix_spawnp to run the new process in a different
2022 directory. These functions are GNU extensions. The function
2023 posix_spawn_file_actions_addchdir_np is similar to the Solaris function
2026 * The popen and system do not run atfork handlers anymore (BZ#17490).
2027 Although it is a possible POSIX violation, the POSIX rationale in
2028 pthread_atfork documentation regarding atfork handlers is to handle
2029 inconsistent mutex state after a fork call in a multi-threaded process.
2030 In both popen and system there is no direct access to user-defined mutexes.
2032 * Support for the C-SKY ABIV2 running on Linux has been added. This port
2033 requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are
2035 - C-SKY ABIV2 soft-float little-endian
2036 - C-SKY ABIV2 hard-float little-endian
2038 * strftime's default formatting of a locale's alternative year (%Ey)
2039 has been changed to zero-pad the year to a minimum of two digits,
2040 like "%y". This improves the display of Japanese era years during
2041 the first nine years of a new era, and is expected to be harmless
2042 for all other locales (only Japanese locales regularly have
2043 alternative year numbers less than 10). Zero-padding can be
2044 overridden with the '_' or '-' flags (which are GNU extensions).
2046 * As a GNU extension, the '_' and '-' flags can now be applied to
2047 "%EY" to control how the year number is formatted; they have the
2048 same effect that they would on "%Ey".
2050 Deprecated and removed features, and other changes affecting compatibility:
2052 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
2053 tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
2055 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
2056 in <sys/procfs.h>, has been corrected to match the type actually used by
2057 the Linux kernel. This affects the size and layout of that structure on
2058 MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
2060 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
2061 struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
2062 defined in <sys/procfs.h>, has been corrected to match the type actually
2063 used by the Linux kernel. This affects the size and layout of those
2066 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
2067 meant to scan a string and allocate space for it with malloc, is now
2068 restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
2069 defined. This extension conflicts with C99's use of '%a' to scan a
2070 hexadecimal floating-point number, which is now available to programs
2071 compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
2073 POSIX.1-2008 includes the feature of allocating a buffer for string input
2074 with malloc, using the modifier letter 'm' instead. Programs using
2075 '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
2076 '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the
2077 C99 '%a' no longer need to avoid _GNU_SOURCE.
2079 GCC's -Wformat warnings can detect most uses of this extension, as long
2080 as all functions that call vscanf, vfscanf, or vsscanf are annotated with
2081 __attribute__ ((format (scanf, ...))).
2083 Changes to build and runtime requirements:
2085 * Python 3.4 or later is required to build the GNU C Library.
2087 * On most architectures, GCC 5 or later is required to build the GNU C
2088 Library. (On powerpc64le, GCC 6.2 or later is still required, as before.)
2090 Older GCC versions and non-GNU compilers are still supported when
2091 compiling programs that use the GNU C Library.
2093 Security related changes:
2095 CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
2096 denial of service due to resource exhaustion when processing getaddrinfo
2097 calls with crafted host names. Reported by Guido Vranken.
2099 CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
2100 32 bits of a 64-bit register with with non-zero upper 32 bit. When it
2101 happened, accessing the 32-bit size_t value as the full 64-bit register
2102 in the assembly string/memory functions would cause a buffer overflow.
2103 Reported by H.J. Lu.
2105 CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
2106 addresses with arbitrary trailing characters, potentially leading to data
2107 or command injection issues in applications.
2109 The following bugs are resolved with this release:
2111 [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
2112 [10496] localedata: 12h time representation in multiple locales faulty
2113 [10797] localedata: it_IT locale numeric does not have a separator for
2115 [11319] libc: dprintf doesn't handle errors properly
2116 [16346] time: mktime: potentially unsafe use of localtime_offset
2117 [17248] build: glibc should not sort CFLAGS (support gcc plugins and
2119 [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
2120 posix_spawn_file_actions_addfchdir_np
2121 [17426] localedata: Indian locales: set the correct date format
2122 [17490] stdio: popen should not invoke atfork handlers
2123 [17783] libc: TIOCSER_TEMT conditions inconsistent
2124 [18040] regex: use-after-free in regexec/get_subexp
2125 [18093] libc: Corrupted aux-cache causes ldconfig to segfault
2126 [20018] network: getaddrinfo should reject IP addresses with trailing
2127 characters (CVE-2016-10739)
2128 [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
2129 [20271] libc: Missing "\n" in __libc_fatal calls
2130 [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
2131 [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
2132 pointer argument is non-NULL
2133 [21037] stdio: open_memstream and freopen
2134 [21286] libc: bits/siginfo.h is missing enum definition for TRAP_HWBKPT
2135 [21716] time: Crash in glibc's mktime in low-memory situations
2136 [22834] stdio: Subprocess forked by popen may crash in Linux when
2137 multithreads call popen
2138 [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
2139 and pthread_create fails.
2140 [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
2141 [23125] libc: riscv64: endless loop when throwing an exception from a
2143 [23275] nptl: Race in pthread_mutex_lock while promoting to
2144 PTHREAD_MUTEX_ELISION_NP.
2145 [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
2147 [23479] math: [mips] bits/fenv.h should not define some macros for soft-
2149 [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
2151 [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
2152 [23509] dynamic-link: CET enabled glibc is incompatible with the older
2154 [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
2155 [23521] nss: get_next_alias nss_files file stream leak
2156 [23538] nptl: Hang in pthread_cond_broadcast
2157 [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
2158 [23578] regex: Invalid memory access if regex pattern contains NUL byte
2159 [23579] libc: Errors misreported in preadv2
2160 [23597] build: support/test-container.c doesn't work with different
2162 [23603] time: mktime signed integer overflow on large timestamps
2163 [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
2164 [23614] libc: powerpc: missing CFI register information in __mpn_*
2166 [23637] string: Generic strstr/strcasestr fails with huge needles
2167 [23640] libc: no way to easily clear FD_CLOEXEC in
2168 posix_spawn_file_actions_adddup2()
2169 [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
2171 [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
2173 [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
2174 [23689] libc: Bug in documentation for rusage.ru_ixrss in
2175 bits/types/struct_rusage.h
2176 [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
2178 [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
2180 [23709] string: glibc 2.25 lacks sse2 optimized strstr()
2181 [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
2182 [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
2184 [23724] localedata: Albanian date formats are incorrect
2185 [23735] math: libnldbl_nonshared.a references internal libm symbols
2186 [23740] localedata: kl_GL: Month names and date formats need update
2187 [23744] regex: regex refactorings to remove BE, avoid duplication
2188 [23745] time: mktime fix for Gnulib + coreutils
2189 [23758] time: Improve the width of alternate representation for year in
2191 [23783] libc: [mips] Missing CMSPAR bits/termios.h
2192 [23789] time: mktime does not set errno on failure
2193 [23791] localedata: Wrong monetary format for ca_ES locale
2194 [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
2195 [23794] locale: c16rtomb does not handle surrogate pairs
2196 [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
2197 [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
2198 [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
2199 [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
2200 [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
2201 [23862] libc: [sh] missing kernel-features.h undefines
2202 [23864] libc: [riscv] missing kernel-features.h undefines
2203 [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
2204 [23907] malloc: Incorrect double-free malloc tcache check disregards
2206 [23913] libc: off-by-one in function maybe_script_execute in
2207 sysdeps/posix/spawni.c
2208 [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
2209 [23923] locale: Add --no-hard-links option to localedef
2210 [23927] network: Linux if_nametoindex() does not close descriptor
2212 [23961] math: powf can overflow to inf without setting errno in non-
2213 nearest rounding mode
2214 [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
2215 [23972] libc: __old_getdents64 uses wrong d_off value on overflow
2216 [23993] libc: glibc 2.29 doesn't build with gcc 4.9
2217 [23995] localedata: Remove execution flags from localedata/locales/bi_VU
2218 [24011] localedata: Fixed small type in comment for locale bs_BA
2219 [24018] libc: gettext() may return NULL
2220 [24022] build: riscv build failure with Linux kernel 4.20-rc7
2221 [24023] build: [2.29 Regression] FAIL: elf/check-localplt
2222 [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
2224 [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
2225 [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
2227 [24046] localedata: en_US locale doesn't define date_fmt
2228 [24063] manual: @var{errno} should be @code{errno}
2229 [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
2230 [24088] libc: VSCR field is not being correctly read in ucontext_t on
2232 [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
2234 [24097] string: Can't use 64-bit register for size_t in assembly codes for
2236 [24110] hurd: SS_DISABLE never set in stack_t value returned by
2238 [24112] network: Do not send DNS queries for non-host names (where all
2239 answers will be rejected)
2240 [24130] libc: alpha __remqu corrupts $f3 register
2247 * The localization data for ISO 14651 is updated to match the 2016
2248 Edition 4 release of the standard, this matches data provided by
2249 Unicode 9.0.0. This update introduces significant improvements to the
2250 collation of Unicode characters. This release deviates slightly from
2251 the standard in that the collation element ordering for lowercase and
2252 uppercase LATIN script characters is adjusted to ensure that regular
2253 expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
2254 is not matched by [a-z]. With the update many locales have been
2255 updated to take advantage of the new collation information. The new
2256 collation information has increased the size of the compiled locale
2257 archive or binary locales.
2259 * The GNU C Library can now be compiled with support for Intel CET, AKA
2260 Intel Control-flow Enforcement Technology. When the library is built
2261 with --enable-cet, the resulting glibc is protected with indirect
2262 branch tracking (IBT) and shadow stack (SHSTK). CET-enabled glibc is
2263 compatible with all existing executables and shared libraries. This
2264 feature is currently supported on i386, x86_64 and x32 with GCC 8 and
2265 binutils 2.29 or later. Note that CET-enabled glibc requires CPUs
2266 capable of multi-byte NOPs, like x86-64 processors as well as Intel
2267 Pentium Pro or newer. NOTE: --enable-cet has been tested for i686,
2268 x86_64 and x32 on non-CET processors. --enable-cet has been tested
2269 for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
2272 * The GNU C Library now has correct support for ABSOLUTE symbols
2273 (SHN_ABS-relative symbols). Previously such ABSOLUTE symbols were
2274 relocated incorrectly or in some cases discarded. The GNU linker can
2275 make use of the newer semantics, but it must communicate it to the
2276 dynamic loader by setting the ELF file's identification (EI_ABIVERSION
2277 field) to indicate such support is required.
2279 * Unicode 11.0.0 Support: Character encoding, character type info, and
2280 transliteration tables are all updated to Unicode 11.0.0, using
2281 generator scripts contributed by Mike FABIAN (Red Hat).
2283 * <math.h> functions that round their results to a narrower type are added
2284 from TS 18661-1:2014 and TS 18661-3:2015:
2286 - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
2287 fMxaddfNx functions.
2289 - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
2290 fMxsubfNx functions.
2292 - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
2293 fMxmulfNx functions.
2295 - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
2296 fMxdivfNx functions.
2298 * Two grammatical forms of month names are now supported for the following
2299 languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
2300 Scottish Gaelic, Upper Sorbian, and Walloon. The following languages now
2301 support two grammatical forms in abbreviated month names: Catalan, Greek,
2304 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
2305 include the support for two grammatical forms of month names.
2307 * Building and running on GNU/Hurd systems now works without out-of-tree
2310 * The renameat2 function has been added, a variant of the renameat function
2311 which has a flags argument. If the flags are zero, the renameat2 function
2312 acts like renameat. If the flag is not zero and there is no kernel
2313 support for renameat2, the function will fail with an errno value of
2314 EINVAL. This is different from the existing gnulib function renameatu,
2315 which performs a plain rename operation in case of a RENAME_NOREPLACE
2316 flags and a non-existing destination (and therefore has a race condition
2317 that can clobber the destination inadvertently).
2319 * The statx function has been added, a variant of the fstatat64
2320 function with an additional flags argument. If there is no direct
2321 kernel support for statx, glibc provides basic stat support based on
2322 the fstatat64 function.
2324 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
2325 library if installed. libidn2 version 2.0.5 or later is recommended. If
2326 libidn2 is not available, internationalized domain names are not encoded
2327 or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
2328 getnameinfo. (getaddrinfo calls with non-ASCII names and AI_IDN will fail
2329 with an encoding error.) Flags which used to change the IDN encoding and
2330 decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
2331 NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
2332 deprecated. They no longer have any effect.
2334 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
2335 DT_AUXILIARY, and DT_FILTER has been expanded to support the full
2336 range of ELF gABI expressions including such constructs as
2337 '$ORIGIN$ORIGIN' (if valid). For SUID/GUID applications the rules
2338 have been further restricted, and where in the past a dynamic string
2339 token sequence may have been interpreted as a literal string it will
2340 now cause a load failure. These load failures were always considered
2341 unspecified behaviour from the perspective of the dynamic loader, and
2342 for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
2343 results in a load failure now.
2345 * Support for ISO C threads (ISO/IEC 9899:2011) has been added. The
2346 implementation includes all the standard functions provided by
2349 - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
2350 thrd_detach, thrd_exit, and thrd_join for thread management.
2352 - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
2353 mtx_destroy for mutual exclusion.
2355 - call_once for function call synchronization.
2357 - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
2358 cnd_wait for conditional variables.
2360 - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
2362 Application developers must link against libpthread to use ISO C threads.
2364 Deprecated and removed features, and other changes affecting compatibility:
2366 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
2367 installed. Software that was using either header should be updated to
2368 use standard <stdio.h> interfaces instead.
2370 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
2371 This was never required by the C standard, and the macros just expanded
2372 to call alternative names for the same functions. If you hoped getc and
2373 putc would provide performance improvements over fgetc and fputc, instead
2374 investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
2375 necessary, flockfile and funlockfile.
2377 * All stdio functions now treat end-of-file as a sticky condition. If you
2378 read from a file until EOF, and then the file is enlarged by another
2379 process, you must call clearerr or another function with the same effect
2380 (e.g. fseek, rewind) before you can read the additional data. This
2381 corrects a longstanding C99 conformance bug. It is most likely to affect
2382 programs that use stdio to read interactive input from a terminal.
2385 * The macros 'major', 'minor', and 'makedev' are now only available from
2386 the header <sys/sysmacros.h>; not from <sys/types.h> or various other
2387 headers that happen to include <sys/types.h>. These macros are rarely
2388 used, not part of POSIX nor XSI, and their names frequently collide with
2389 user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
2390 further explanation.
2392 <sys/sysmacros.h> is a GNU extension. Portable programs that require
2393 these macros should first include <sys/types.h>, and then include
2394 <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
2396 * The tilegx*-*-linux-gnu configurations are no longer supported.
2398 * The obsolete function ustat is no longer available to newly linked
2399 binaries; the headers <ustat.h> and <sys/ustat.h> have been removed. This
2400 function has been deprecated in favor of fstatfs and statfs.
2402 * The obsolete function nfsservctl is no longer available to newly linked
2403 binaries. This function was specific to systems using the Linux kernel
2404 and could not usefully be used with the GNU C Library on systems with
2405 version 3.1 or later of the Linux kernel.
2407 * The obsolete function name llseek is no longer available to newly linked
2408 binaries. This function was specific to systems using the Linux kernel
2409 and was not declared in a header. Programs should use the lseek64 name
2410 for this function instead.
2412 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
2413 getaddrinfo and getnameinfo functions have been deprecated. The behavior
2414 previously selected by them is now always enabled.
2416 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
2417 the getaddrinfo and getnameinfo functions have been deprecated. The STD3
2418 restriction (rejecting '_' in host names, among other things) has been
2419 removed, for increased compatibility with non-IDN name resolution.
2421 * The fcntl function now have a Long File Support variant named fcntl64. It
2422 is added to fix some Linux Open File Description (OFD) locks usage on non
2423 LFS mode. As for others *64 functions, fcntl64 semantics are analogous with
2424 fcntl and LFS support is handled transparently. Also for Linux, the OFD
2425 locks act as a cancellation entrypoint.
2427 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
2428 ecb_crypt, and des_setparity are no longer available to newly linked
2429 binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
2430 longer installed. These functions encrypted and decrypted data with the
2431 DES block cipher, which is no longer considered secure. Software that
2432 still uses these functions should switch to a modern cryptography library,
2435 * Reflecting the removal of the encrypt and setkey functions above, the
2436 macro _XOPEN_CRYPT is no longer defined. As a consequence, the crypt
2437 function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
2440 * The obsolete function fcrypt is no longer available to newly linked
2441 binaries. It was just another name for the standard function crypt,
2442 and it has not appeared in any header file in many years.
2444 * We have tentative plans to hand off maintenance of the passphrase-hashing
2445 library, libcrypt, to a separate development project that will, we hope,
2446 keep up better with new passphrase-hashing algorithms. We will continue
2447 to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
2448 'crypt_r' should not need to change at all; however, distributions will
2449 need to install <crypt.h> and libcrypt from a separate project.
2451 In this release, if the configure option --disable-crypt is used, glibc
2452 will not install <crypt.h> or libcrypt, making room for the separate
2453 project's versions of these files. The plan is to make this the default
2454 behavior in a future release.
2456 Changes to build and runtime requirements:
2458 GNU make 4.0 or later is now required to build glibc.
2460 Security related changes:
2462 CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
2463 been fixed by removing the glibc-internal IDNA implementation and using
2464 the system-provided libidn2 library instead. Originally reported by Hanno
2465 Böck and Christian Weisgerber.
2467 CVE-2017-18269: An SSE2-based memmove implementation for the i386
2468 architecture could corrupt memory. Reported by Max Horn.
2470 CVE-2018-11236: Very long pathname arguments to realpath function could
2471 result in an integer overflow and buffer overflow. Reported by Alexey
2474 CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
2475 architecture could write beyond the target buffer, resulting in a buffer
2476 overflow. Reported by Andreas Schwab.
2478 The following bugs are resolved with this release:
2480 [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
2481 [6889] manual: 'PWD' mentioned but not specified
2482 [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
2483 when __WORDSIZE != 64
2484 [13762] regex: re_search etc. should return -2 on memory exhaustion
2485 [13888] build: /tmp usage during testing
2486 [13932] math: dbl-64 pow unexpectedly slow for some inputs
2487 [14092] nptl: Support C11 threads
2488 [14095] localedata: Review / update collation data from Unicode / ISO
2490 [14508] libc: -Wformat warnings
2491 [14553] libc: Namespace pollution loff_t in sys/types.h
2492 [14890] libc: Make NT_PRFPREG canonical.
2493 [15105] libc: Extra PLT references with -Os
2494 [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
2496 [16335] manual: Feature test macro documentation incomplete and out of
2498 [16552] libc: Unify umount implementations in terms of umount2
2499 [17082] libc: htons et al.: statement-expressions prevent use on global
2500 scope with -O1 and higher
2501 [17343] libc: Signed integer overflow in /stdlib/random_r.c
2502 [17438] localedata: pt_BR: wrong d_fmt delimiter
2503 [17662] libc: please implement binding for the new renameat2 syscall
2504 [17721] libc: __restrict defined as /* Ignore */ even in c11
2505 [17979] libc: inconsistency between uchar.h and stdint.h
2506 [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
2507 [18023] libc: extend_alloca is broken (questionable pointer comparison,
2508 horrible machine code)
2509 [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
2511 [18471] libc: llseek should be a compat symbol
2512 [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
2514 [18991] nss: nss_files skips large entry in database
2515 [19239] libc: Including stdlib.h ends up with macros major and minor being
2517 [19463] libc: linknamespace failures when compiled with -Os
2518 [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
2519 [19527] locale: Normalized charset name not recognized by setlocale
2520 [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
2521 [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
2523 [19728] network: out of bounds stack read in libidn function
2524 idna_to_ascii_4i (CVE-2016-6261)
2525 [19729] network: out of bounds heap read on invalid utf-8 inputs in
2526 stringprep_utf8_nfkc_normalize (CVE-2016-6263)
2527 [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
2529 [20079] libc: Add SHT_X86_64_UNWIND to elf.h
2530 [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
2531 [20419] dynamic-link: files with large allocated notes crash in
2533 [20530] libc: bswap_16 should use __builtin_bswap16() when available
2534 [20890] dynamic-link: ldconfig: fsync the files before atomic rename
2535 [20980] manual: CFLAGS environment variable replaces vital options
2536 [21163] regex: Assertion failure in pop_fail_stack when executing a
2537 malformed regexp (CVE-2015-8985)
2538 [21234] manual: use of CFLAGS makes glibc detect no optimization
2539 [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
2540 [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
2541 [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
2542 [21508] locale: intl/tst-gettext failure with latest msgfmt
2543 [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
2544 [21812] network: getifaddrs() returns entries with ifa_name == NULL
2545 [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
2547 [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
2549 [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
2550 [22247] network: Integer overflow in the decode_digit function in
2551 puny_decode.c in libidn (CVE-2017-14062)
2552 [22342] nscd: NSCD not properly caching netgroup
2553 [22391] nptl: Signal function clear NPTL internal symbols inconsistently
2554 [22550] localedata: es_ES locale (and other es_* locales): collation
2555 should treat ñ as a primary different character, sync the collation
2556 for Spanish with CLDR
2557 [22638] dynamic-link: sparc: static binaries are broken if glibc is built
2558 by gcc configured with --enable-default-pie
2559 [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
2560 [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
2561 crossing 2GB threshold (CVE-2017-18269)
2562 [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
2564 [22735] time: Misleading typo in time.h source comment regarding
2566 [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
2567 [22761] libc: No trailing `%n' conversion specifier in FMT passed from
2568 `__assert_perror_fail ()' to `__assert_fail_base ()'
2569 [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
2571 [22786] libc: Stack buffer overflow in realpath() if input size is close
2572 to SSIZE_MAX (CVE-2018-11236)
2573 [22787] dynamic-link: _dl_check_caller returns false when libc is linked
2574 through an absolute DT_NEEDED path
2575 [22792] build: tcb-offsets.h dependency dropped
2576 [22797] libc: pkey_get() uses non-reserved name of argument
2577 [22807] libc: PTRACE_* constants missing for powerpc
2578 [22818] glob: posix/tst-glob_lstat_compat failure on alpha
2579 [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
2580 [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
2581 [22848] localedata: ca_ES: update date definitions from CLDR
2582 [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
2583 [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
2584 [22896] localedata: Update locale data for an_ES
2585 [22902] math: float128 test failures with GCC 8
2586 [22918] libc: multiple common of `__nss_shadow_database'
2587 [22919] libc: sparc32: backtrace yields infinite backtrace with
2589 [22926] libc: FTBFS on powerpcspe
2590 [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
2592 [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
2593 [22947] libc: FAIL: misc/tst-preadvwritev2
2594 [22963] localedata: cs_CZ: Add alternative month names
2595 [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
2596 [22996] localedata: change LC_PAPER to en_US in es_BO locale
2597 [22998] dynamic-link: execstack tests are disabled when SELinux is
2599 [23005] network: Crash in __res_context_send after memory allocation
2601 [23007] math: strtod cannot handle -nan
2602 [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
2603 [23036] regex: regex equivalence class regression
2604 [23037] libc: initialize msg_flags to zero for sendmmsg() calls
2605 [23069] libc: sigaction broken on riscv64-linux-gnu
2606 [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
2607 [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
2608 patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
2609 [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
2610 and libc build with -Os)
2611 [23140] localedata: More languages need two forms of month names
2612 [23145] libc: _init/_fini aren't marked as hidden
2613 [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
2614 [23171] math: C++ iseqsig for long double converts arguments to double
2615 [23178] nscd: sudo will fail when it is run in concurrent with commands
2616 that changes /etc/passwd
2617 [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
2619 [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
2620 [23208] localedata: New locale - Lower Sorbian (dsb)
2621 [23233] regex: Memory leak in build_charclass_op function in file
2623 [23236] stdio: Harden function pointers in _IO_str_fields
2624 [23250] nptl: Offset of __private_ss differs from GCC
2625 [23253] math: tgamma test suite failures on i686 with -march=x86-64
2626 -mtune=generic -mfpmath=sse
2627 [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
2629 [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
2630 [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
2632 [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
2633 [23277] math: nan function should not have const attribute
2634 [23279] math: scanf and strtod wrong for some hex floating-point
2635 [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
2637 [23290] localedata: IBM273 is not equivalent to ISO-8859-1
2638 [23303] build: undefined reference to symbol
2639 '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
2640 [23307] dynamic-link: Absolute symbols whose value is zero ignored in
2642 [23313] stdio: libio vtables validation and standard file object
2644 [23329] libc: The __libc_freeres infrastructure is not properly run across
2646 [23349] libc: Various glibc headers no longer compatible with
2648 [23351] malloc: Remove unused code related to heap dumps and malloc
2650 [23363] stdio: stdio-common/tst-printf.c has non-free license
2651 [23396] regex: Regex equivalence regression in single-byte locales
2652 [23422] localedata: oc_FR: More updates of locale data
2653 [23442] build: New warning with GCC 8
2654 [23448] libc: Out of bounds access in IBM-1390 converter
2655 [23456] libc: Wrong index_cpu_LZCNT
2656 [23458] build: tst-get-cpu-features-static isn't added to tests
2657 [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
2659 [23467] dynamic-link: x86/CET: A property note parser bug
2666 * The GNU C Library can now be compiled with support for building static
2667 PIE executables (See --enable-static-pie in INSTALL). These static PIE
2668 executables are like static executables but can be loaded at any address
2669 and provide additional security hardening benefits at the cost of some
2670 memory and performance. When the library is built with --enable-static-pie
2671 the resulting libc.a is usable with GCC 8 and above to create static PIE
2672 executables using the GCC option '-static-pie'. This feature is currently
2673 supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
2674 aarch64 with binutils 2.30 or later.
2676 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
2677 sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
2680 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
2682 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
2684 * In order to support faster and safer process termination the malloc API
2685 family of functions will no longer print a failure address and stack
2686 backtrace after detecting heap corruption. The goal is to minimize the
2687 amount of work done after corruption is detected and to avoid potential
2688 security issues in continued process execution. Reducing shutdown time
2689 leads to lower overall process restart latency, so there is benefit both
2690 from a security and performance perspective.
2692 * The abort function terminates the process immediately, without flushing
2693 stdio streams. Previous glibc versions used to flush streams, resulting
2694 in deadlocks and further data corruption. This change also affects
2695 process aborts as the result of assertion failures.
2697 * On platforms where long double has the IEEE binary128 format (aarch64,
2698 alpha, mips64, riscv, s390 and sparc), the math library now implements
2699 _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
2700 These are the same interfaces added in version 2.26 for some platforms where
2701 this format is supported but is not the format of long double.
2703 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
2704 mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
2705 implements interfaces for that type, as defined by ISO/IEC TS
2706 18661-3:2015. These are corresponding interfaces to those supported for
2709 * The math library now implements interfaces for the _Float32, _Float64 and
2710 _Float32x types, as defined by ISO/IEC TS 18661-3:2015. These are
2711 corresponding interfaces to those supported for _Float128.
2713 * glibc now implements the memfd_create and mlock2 functions on Linux.
2715 * Support for memory protection keys was added. The <sys/mman.h> header now
2716 declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
2719 * The copy_file_range function was added.
2721 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
2723 * The ldconfig utility now processes `include' directives using the C/POSIX
2724 collation ordering. Previous glibc versions used locale-specific
2725 ordering, the change might break systems that relied on that.
2727 * Support for two grammatical forms of month names has been added.
2728 In a call to strftime, the "%B" and "%b" format specifiers will now
2729 produce the grammatical form required when the month is used as part
2730 of a complete date. New "%OB" and "%Ob" specifiers produce the form
2731 required when the month is named by itself. For instance, in Greek
2732 and in many Slavic and Baltic languages, "%B" will produce the month
2733 in genitive case, and "%OB" will produce the month in nominative case.
2735 In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
2736 are all valid and will all accept any known form of month
2737 name---standalone or complete, abbreviated or full. In a call to
2738 nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
2739 the strings used by "%B" and "%b", respectively. New query
2740 constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
2741 used by "%OB" and "%Ob", respectively.
2743 In a locale definition file, use "alt_mon" and "ab_alt_mon" to
2744 define the strings for %OB and %Ob, respectively; these have the
2745 same syntax as "mon" and "abmon". These arrays are optional; if they
2746 are not provided then they have the same content as "mon" and "abmon",
2749 These features are provided for locales which define "alt_mon" and/or
2750 "ab_alt_mon" in their locale source data. This release includes such
2751 alternative month name data for the following languages: Belarusian,
2752 Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
2754 This feature is currently a GNU extension, but it is expected to
2755 be added to the next revision of POSIX, and it is also already
2756 available on some BSD-derived operating systems.
2758 This feature will cause existing statically compiled applications
2759 to fail to load locales and fall back to the builtin C/POSIX locales.
2760 See notes below for other changes affecting compatibility.
2762 * Support for the RISC-V ISA running on Linux has been added. This port
2763 requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
2764 for the following ISA and ABI pairs:
2770 Deprecated and removed features, and other changes affecting compatibility:
2772 * Statically compiled applications attempting to load locales compiled for the
2773 GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
2774 locale. The reason for this is that the addition of the new "%OB" and "%Ob",
2775 support for two grammatical forms of the month names, also extends the locale
2776 data binary format. Static applications needing locale support must be
2777 recompiled to match the runtime and data they are deployed with. In some
2778 distributions there is an upgrade window where dynamically linked applications
2779 may use a new library but the old locale data and also fall back to the
2780 builtin C/POSIX locales; restarting the application process is sufficient to
2783 * Support for statically linked applications which call dlopen is deprecated
2784 and will be removed in a future version of glibc. Applications which call
2785 dlopen need to be linked dynamically instead.
2787 * Support for old programs which use internal stdio data structures and
2788 functions is deprecated. This includes programs which use the C++ streams
2789 provided by libstdc++ in GCC 2.95. Programs which use the internal
2790 symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
2791 _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
2792 _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
2793 _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
2794 _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
2795 _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
2796 _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
2797 _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
2798 _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
2799 _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
2800 _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
2801 _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
2802 _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
2803 _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
2804 _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
2805 _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
2806 _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
2807 _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
2808 _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
2809 _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
2810 _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
2811 future version of glibc. Unlike other symbol removals, these old
2812 applications will not be supported using compatibility symbols.
2814 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
2815 defined by <sys/ptrace.h>.
2817 * libm no longer supports SVID error handling (calling a user-provided
2818 matherr function on error) or the _LIB_VERSION variable to control error
2819 handling. (SVID error handling and the _LIB_VERSION variable still work
2820 for binaries linked against older versions of the GNU C Library.) The
2821 libieee.a library is no longer provided. math.h no longer defines struct
2822 exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
2823 TLOSS, PLOSS and HUGE.
2825 * The libm functions pow10, pow10f and pow10l are no longer supported for
2826 new programs. Programs should use the standard names exp10, exp10f and
2827 exp10l for these functions instead.
2829 * The mcontext_t type is no longer the same as struct sigcontext. On
2830 platforms where it was previously the same, this changes the C++ name
2831 mangling for interfaces involving this type.
2833 * The add-ons mechanism for building additional packages at the same time as
2834 glibc has been removed. The --enable-add-ons configure option is now
2837 * The --without-fp configure option is now ignored. Whether hardware
2838 floating-point instructions are used is now configured based on whether
2839 the compiler used at configure time (without any options implied by a
2840 --with-cpu= configure option) uses such instructions.
2842 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
2843 the specified string can be parsed as a domain name.
2845 * In the malloc_info output, the <heap> element may contain another <aspace>
2846 element, "subheaps", which contains the number of sub-heaps.
2848 * The libresolv function p_secstodate is no longer supported for new
2851 * The tilepro-*-linux-gnu configuration is no longer supported.
2853 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
2854 and will be removed in a future release. Software that is still using
2855 either header should be updated to use standard <stdio.h> interfaces
2858 libio.h was originally the header for a set of supported GNU extensions,
2859 but they have not been maintained as such in many years, they are now
2860 standing in the way of improvements to stdio, and we don't think there are
2861 any remaining external users. _G_config.h was never intended for public
2862 use, but predates the bits convention.
2864 Changes to build and runtime requirements:
2866 * bison version 2.7 or later is required to generate code in the 'intl'
2869 Security related changes:
2871 CVE-2009-5064: The ldd script would sometimes run the program under
2872 examination directly, without preventing code execution through the
2873 dynamic linker. (The glibc project disputes that this is a security
2874 vulnerability; only trusted binaries must be examined using the ldd
2877 CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
2878 suffered from a one-byte overflow during ~ operator processing (either
2879 on the stack or the heap, depending on the length of the user name).
2880 Reported by Tim Rühsen.
2882 CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
2883 would sometimes fail to free memory allocated during ~ operator
2884 processing, leading to a memory leak and, potentially, to a denial
2887 CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
2888 without GLOB_NOESCAPE, could write past the end of a buffer while
2889 unescaping user names. Reported by Tim Rühsen.
2891 CVE-2017-17426: The malloc function, when called with an object size near
2892 the value SIZE_MAX, would return a pointer to a buffer which is too small,
2893 instead of NULL. This was a regression introduced with the new malloc
2894 thread cache in glibc 2.26. Reported by Iain Buclaw.
2896 CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
2897 to the allocation of too much memory. (This is not a security bug per se,
2898 it is mentioned here only because of the CVE assignment.) Reported by
2901 CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
2902 of the number of search path components. (This is not a security
2903 vulnerability per se because no trust boundary is crossed if the fix for
2904 CVE-2017-1000366 has been applied, but it is mentioned here only because
2905 of the CVE assignment.) Reported by Qualys.
2907 CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
2908 for AT_SECURE or SUID binaries could be used to load libraries from the
2911 CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
2912 succeeds without returning an absolute path due to unexpected behaviour
2913 of the Linux kernel getcwd syscall. Reported by halfdog.
2915 CVE-2018-6485: The posix_memalign and memalign functions, when called with
2916 an object size near the value of SIZE_MAX, would return a pointer to a
2917 buffer which is too small, instead of NULL. Reported by Jakub Wilk.
2919 CVE-2018-6551: The malloc function, when called with an object size near
2920 the value of SIZE_MAX, would return a pointer to a buffer which is too
2921 small, instead of NULL.
2923 The following bugs are resolved with this release:
2925 [866] glob: glob should match dangling symlinks
2926 [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
2927 [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
2929 [5997] math: Very slow execution of sinf function
2930 [10580] localedata: hr_HR: updated locale
2931 [10871] locale: 'mon' array should contain both nominative and genitive
2933 [12349] localedata: eu_ES: incorrect thousands separator
2934 [13605] localedata: shn_MM: new Shan locale
2935 [13805] localedata: ru_RU: currency should use ',' as radix point
2936 [13953] localedata: km_KH: locale update
2937 [13994] localedata: mjw_IN: new locale
2938 [14121] build: make writes .mo files in po directory
2939 [14333] libc: Fix the race between atexit() and exit()
2940 [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
2941 [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
2943 [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
2944 [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
2945 width Latin characters
2946 [15332] localedata: es_CU: locale update
2947 [15436] stdio: Don't close or flush stdio streams on abort
2948 [15537] localedata: lv_LV: invalid collation for Latvian diacritical
2950 [16148] localedata: ca_ES: incorrect thousands separator
2951 [16750] dynamic-link: ldd should not try to execute the binaries
2953 [16777] localedata: pl_PL: incorrect thousands separator in locale
2954 [16905] localedata: hanzi: new collation
2955 [17563] localedata: cmn_TW: add hanzi collation
2956 [17750] localedata: wrong collation order of diacritics in most locales
2957 [17804] libc: scandirat fails with ENOMEM because it checks for errno even
2959 [17956] build: Build fails on missing definitions from header file
2960 nss/nss.h when Mozilla NSS is used for cryptography
2961 [18203] libc: realpath() does not handle unreachable paths correctly
2962 [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
2963 [18812] localedata: kab_DZ: new Kabyle Algeria locale
2964 [18822] libc: Internal functions are called via PLT
2965 [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
2966 [19170] libc: __gmon_start__ defined in hppa in crtn.S
2967 [19574] libc: glibc should support building static PIE binaries
2968 [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
2970 [19971] glob: glob: Do not skip entries with zero d_ino values
2971 [19982] localedata: fr.po: spelling mistake for error code EXDEV
2972 [20008] localedata: km_KH: convert to translit_neutral
2973 [20009] localedata: tr_TR: convert LC_CTYPE to i18n
2974 [20142] math: [x86_64] Add SSE4.1 trunc, truncf
2975 [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
2976 [20482] localedata: de_CH: abbreviated weekdays should be two letters
2977 [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
2979 [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
2980 they're set, wrong errors returned by gaih_inet when lookup functions
2982 [20756] localedata: [PATCH] Use Unicode wise thousands separator
2983 [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
2985 [20952] localedata: yuw_PG: new locale
2986 [21084] localedata: charmaps/IBM858: new codepage
2987 [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
2988 [21242] libc: assert gives pedantic warning in old gcc versions
2989 [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
2990 __regcall calling convention
2991 [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
2992 [21326] libc: C99 functions are not declared for C++11 and later if
2993 _GNU_SOURCE is not predefined by g++
2994 [21457] libc: sys/ucontext.h namespace
2995 [21530] libc: tmpfile() should be implemented using O_TMPFILE
2996 [21660] math: GCC fails to compile a formula with tgmath.h
2997 [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
2998 SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
2999 (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
3000 [21684] math: tgmath.h handling of complex integers
3001 [21685] math: tgmath.h handling of bit-fields
3002 [21686] math: tgmath.h handling of __int128
3003 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3005 [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
3007 [21750] localedata: column width of characters incompatible with classical
3009 [21754] malloc: malloc: Perform as little work as possible after heap
3010 consistency check failures
3011 [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
3012 [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
3013 [21791] string: Unused XXX_chk_XXX functions in libc.a
3014 [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
3016 [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
3018 [21845] localedata: Added new Locale bho_NP
3019 [21853] localedata: Fix abday Which looks same as day in zh_SG
3020 [21854] localedata: Added New Locale en_SC
3021 [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
3022 [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
3023 _dl_runtime_resolve_avx_slow
3024 [21885] network: getaddrinfo: gethosts does not release resolver context
3025 on memory allocation failure
3026 [21899] libc: XPG4.2 sigaction namespace
3027 [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
3029 [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
3031 [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
3032 errno value, causing getaddrinfo to fail
3033 [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
3034 [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
3035 instead of EAI_NODATA
3036 [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
3037 constant PTRACE_SEIZE_DEVEL
3038 [21930] math: C-only gcc builtins used in <math.h> isinf
3039 [21932] network: Unpaired __resolv_context_get in generic get*_r
3041 [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
3042 [21944] libc: sigval namespace
3043 [21951] localedata: Update hanzi collation by stroke
3044 [21955] math: Wrong alignment of L(SP_RANGE)/L(SP_INF_0) in
3045 sysdeps/x86_64/fpu/e_expf.S
3046 [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
3047 allocation in syscall loops)
3048 [21959] localedata: Fix Country name for xh_ZA
3049 [21960] localedata: Fix abmon for bem_ZM
3050 [21966] math: AVX2 mathvec functions use FMA without checking
3051 [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
3052 [21971] localedata: Added New Locale for mfe_MU
3053 [21972] libc: assert macro requires operator== (int) for its argument type
3054 [21973] math: [sparc] libm missing sqrtl compat symbol
3055 [21974] libc: Remove __bb_init_func and __bb_exit_func
3056 [21982] string: stratcliff.c: error: assuming signed overflow does not
3058 [21986] stdio: __guess_grouping is called incorrectly
3059 [21987] math: [sparc32] wrong bits/long-double.h installed
3060 [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
3062 [22022] localedata: Missing country_name for mni_IN
3063 [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
3065 [22025] locale: iconv: Inconsistency between pointer mangling and NULL
3067 [22026] locale: iconv_open: heap overflow on gconv_init failure
3068 [22028] math: bits/math-finite.h _MSUF_ expansion namespace
3069 [22035] math: [m68k] bits/math-inline.h macro namespace
3070 [22038] localedata: Fix abbreviated weeks and months for Somali
3071 [22044] localedata: Remove redundant data for Limburgish Language
3072 [22050] malloc: Linking with -lmcheck does not hook
3073 __malloc_initialize_hook correctly
3074 [22051] libc: zero terminator in the middle of glibc's .eh_frame
3075 [22052] malloc: malloc failed to compile with GCC 7 and -O3
3076 [22070] localedata: charmaps/UTF-8: wcwidth for
3077 Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
3078 [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
3079 Jungseong and Jongseong) should be 0
3080 [22078] nss: nss_files performance issue in multi mode
3081 [22082] math: bits/math-finite.h exp10 condition
3082 [22086] libc: pcprofiledump incorrect cross-endian condition
3083 [22093] dynamic-link: ld.so no longer searches in .../x86_64
3084 [22095] network: Name server address allocation memory leak in resolv.conf
3086 [22096] network: __resolv_conf_attach can incorrectly free passed conf
3088 [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
3089 [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
3091 [22111] malloc: malloc: per thread cache is not returned when thread exits
3092 [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
3093 [22134] libc: [linux] implement fexecve with execveat
3094 [22142] libc: [powerpc] printf outputs a wrong value of DBL_MAX on ppc64 and
3096 [22145] libc: ttyname() gives up too early in the face of namespaces
3097 [22146] math: C++ build issue with float128 on x86_64
3098 [22153] nptl: nptl: save error code before process termination
3099 [22156] libc: [hppa,ia64,microblaze] Executable stack default
3100 [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
3101 [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
3102 [22165] libc: [hppa] Text relocations in libc.so
3103 [22180] libc: destructor registered via __cxa_atexit is called twice
3104 [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
3105 symlinks") cause "make" segfaults
3106 [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
3108 [22207] libc: FAIL: stdlib/test-atexit-race
3109 [22225] math: nearbyint arithmetic moved before feholdexcept
3110 [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
3111 [22235] math: iscanonical in C++ and float128
3112 [22243] math: log2(0) and log10(0) are wrong in downward rounding without
3113 the svid compat wrapper
3114 [22244] math: ynf and yn are wrong without the svid compat wrapper
3115 [22273] libc: Improper assert in Linux posix_spawn implementation
3116 [22284] libc: -pg -pie doesn't work
3117 [22292] locale: localedef exits with error 4 when it should be error 1
3118 [22294] locale: Allow "" for int_currency_symbol definition in locales.
3119 [22295] locale: Don't warn on non-symbolic characters in locale sources in
3121 [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
3122 [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
3124 [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
3125 [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
3126 [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
3127 [22322] libc: [mips64] wrong bits/long-double.h installed
3128 [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
3129 [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
3131 [22336] localedata: cs_CZ LC_COLLATE does not use i18n
3132 [22343] malloc: Integer overflow in posix_memalign
3133 [22347] libc: getrandom() returns the number of bytes that were copied to
3134 the buffer even though the comments say "Return 0 on success and -1 on
3136 [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
3137 [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
3139 [22370] dynamic-link: Incorrect note padding check
3140 [22375] libc: malloc returns pointer from tcache_get when should return
3141 NULL (CVE-2017-17426)
3142 [22377] math: iseqsig, float128 and C++
3143 [22382] localedata: Error in tpi_PG locale
3144 [22387] localedata: Replace unicode sequences <Uxxxx> for characters
3145 inside the ASCII printable range
3146 [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
3148 [22403] localedata: Slash needs escaping in some locales
3149 [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
3150 [22409] network: res_hnok does not accept some host names used on the
3152 [22412] network: res_dnok, res_hnok should perform syntax checks
3153 [22413] network: ns_name_pton ignores syntactically invalid trailing
3155 [22415] stdio: setvbuf can lead to invalid free/segfault
3156 [22432] build: Non-deterministic build
3157 [22439] malloc: malloc_info should compute summary statistics for all sub-
3159 [22442] network: if_nametoindex could report index for the wrong
3160 networking interface
3161 [22446] build: aliasing violation calling readlink in handle_request
3162 [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
3163 [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
3164 [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
3165 __nscd_hash/__nss_hash
3166 [22463] network: p_secstodate overflow handling
3167 [22469] localedata: pl_PL LC_COLLATE does not use i18n
3168 [22478] libc: sigwait can fail with EINTR
3169 [22505] libc: ldconfig processes include directive in locale-specific
3171 [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
3172 [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
3173 [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
3174 [22524] localedata: lt_LT LC_COLLATE does not use copy "iso14651_t1"
3175 [22527] localedata: tr_TR LC_COLLATE does not use copy "iso14651_t1"
3176 [22534] localedata: Collation rules for Serbian and Bosnian should be the
3177 same as for Croatian
3178 [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
3179 [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
3180 [22577] libc: missing newline after "cannot allocate TLS data structures
3182 [22588] manual: manual/conf.texi: missing underscore in front of
3184 [22593] math: nextafter and nexttoward are declared with const attribute
3185 [22596] manual: manual: finite(nan) wrongly described as returning nonzero
3186 [22603] string: ia64 memchr overflows internal pointer check
3187 [22605] libc: SH clone does not set the exit code correctly
3188 [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
3190 [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
3191 [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
3192 modified in case of success
3193 [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
3194 [22615] manual: manual: ambiguous wording about errno value in case of
3196 [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
3198 [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
3199 binaries or if /proc is not mounted (CVE-2017-16997)
3200 [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
3201 [22630] build: $(no-pie-ldflag) is no longer effective
3202 [22631] math: [m68k] Bad const attributes in bits/mathinline.h
3203 [22635] nptl: pthread_self returns NULL before libpthread is loaded
3204 [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
3205 [22637] nptl: guard size is subtracted from thread stack size instead of
3207 [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
3208 [22657] localedata: hu_HU: Avoid double space in date
3209 [22660] math: fmax, fmin sNaN handling on alpha
3210 [22664] libc: New warning of GCC8
3211 [22665] math: alpha: ceil and floor raise inexact exceptions
3212 [22666] math: alpha: trunc raise inexact exceptions
3213 [22667] libc: makecontext lacks stack alignment on i386
3214 [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
3215 [22679] libc: getcwd(3) can succeed without returning an absolute path
3217 [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
3218 elision and tunables
3219 [22687] math: [powerpc-nofpu] complex long double functions spurious
3221 [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
3222 [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
3223 [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
3225 [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
3226 [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
3228 [22701] nis: Incomplete removal of libnsl
3229 [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
3230 [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
3231 [22715] dynamic-link: FAIL: elf/tst-audit10
3232 [22719] libc: Backtrace tests fail on hppa
3233 [22742] libc: [aarch64] mcontext_t __reserved field got renamed
3234 [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
3235 [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
3236 before the first call to crypt_r () in crypt/badsalttest.c
3243 * A per-thread cache has been added to malloc. Access to the cache requires
3244 no locks and therefore significantly accelerates the fast path to allocate
3245 and free small amounts of memory. Refilling an empty cache requires locking
3246 the underlying arena. Performance measurements show significant gains in a
3247 wide variety of user workloads. Workloads were captured using a special
3248 instrumented malloc and analyzed with a malloc simulator. Contributed by
3249 DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
3251 * Unicode 10.0.0 Support: Character encoding, character type info, and
3252 transliteration tables are all updated to Unicode 10.0.0, using
3253 generator scripts contributed by Mike FABIAN (Red Hat).
3254 These updates cause user visible changes, especially the changes in
3255 wcwidth for many emoji characters cause problems when emoji sequences
3256 are rendered with pango, see for example:
3257 https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
3259 * Collation of Hungarian has been overhauled and is now consistent with "The
3260 Rules of Hungarian Orthography, 12th edition" (Bug 18934). Contributed by
3263 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
3265 - The GNU C Library will now detect when /etc/resolv.conf has been
3266 modified and reload the changed configuration. The new resolver option
3267 “no-reload” (RES_NORELOAD) disables this behavior.
3269 - The GNU C Library now supports an arbitrary number of search domains
3270 (configured using the “search” directive in /etc/resolv.conf);
3271 previously, there was a hard limit of six domains. For backward
3272 compatibility, applications that directly modify the ‘_res’ global
3273 object are still limited to six search domains.
3275 - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
3276 Library will now randomly pick a name server from the configuration as a
3277 starting point. (Previously, the second name server was always used.)
3279 * The tunables feature is now enabled by default. This allows users to tweak
3280 behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
3282 * New function reallocarray, which resizes an allocated block (like realloc)
3283 to the product of two sizes, with a guaranteed clean failure upon integer
3284 overflow in the multiplication. Originally from OpenBSD, contributed by
3285 Dennis Wölfing and Rüdiger Sonderfeld.
3287 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
3288 These are extended versions of preadv and pwritev, respectively, taking an
3289 additional flags argument. The set of supported flags depends on the
3290 running kernel; full support currently requires kernel 4.7 or later.
3292 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
3293 create a new session ID for the spawned process. This feature is
3294 scheduled to be added to the next major revision of POSIX; for the time
3295 being, it is available under _GNU_SOURCE.
3297 * errno.h is now safe to use from C-preprocessed assembly language on all
3298 supported operating systems. In this context, it will only define the
3299 Exxxx constants, as preprocessor macros expanding to integer literals.
3301 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
3302 128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
3303 754-2008) and ISO/IEC TS 18661-3:2015. Contributed by Paul E. Murphy,
3304 Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
3306 To compile programs that use this feature, the compiler must support
3307 128-bit floating point with the type name _Float128 (as defined by TS
3308 18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
3309 C prior to version 7). _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
3310 must be defined to make the new interfaces visible.
3312 The new functions and macros correspond to those present for other
3313 floating-point types (except for a few obsolescent interfaces not
3314 supported for the new type), with F128 or f128 suffixes; for example,
3315 strtof128, HUGE_VAL_F128 and cosf128. Following TS 18661-3, there are no
3316 printf or scanf formats for the new type; the strfromf128 and strtof128
3317 interfaces should be used instead.
3319 Deprecated and removed features, and other changes affecting compatibility:
3321 * The synchronization that pthread_spin_unlock performs has been changed to
3322 now be equivalent to a C11 atomic store with release memory order to the
3323 spin lock's memory location. Previously, several (but not all)
3324 architectures used stronger synchronization (e.g., containing what is
3325 often called a full barrier). This change can improve performance, but
3326 may affect odd fringe uses of spin locks that depend on the previous
3327 behavior (e.g., using spin locks as atomic variables to try to implement
3328 Dekker's mutual exclusion algorithm).
3330 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
3333 * Sun RPC is deprecated. The rpcgen program, librpcsvc, and Sun RPC headers
3334 will only be built and installed when the GNU C Library is configured with
3335 --enable-obsolete-rpc. This allows alternative RPC implementations, such
3336 as TIRPC or rpcsvc-proto, to be used.
3338 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
3339 libnss_compat, are deprecated, and will not be built or installed by
3342 The NIS(+) support library, libnsl, is also deprecated. By default, a
3343 compatibility shared library will be built and installed, but not headers
3344 or development libraries. Only a few NIS-related programs require this
3345 library. (In particular, the GNU C Library has never required programs
3346 that use 'gethostbyname' to be linked with libnsl.)
3348 Replacement implementations based on TIRPC, which additionally support
3349 IPv6, are available from <https://github.com/thkukuk/>. The configure
3350 option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
3351 name service modules, to be built and installed.
3353 * The DNS stub resolver no longer performs EDNS fallback. If EDNS or DNSSEC
3354 support is enabled, the configured recursive resolver must support EDNS.
3355 (Responding to EDNS-enabled queries with responses which are not
3356 EDNS-enabled is fine, but FORMERR responses are not.)
3358 * res_mkquery and res_nmkquery no longer support the IQUERY opcode. DNS
3359 servers have not supported this opcode for a long time.
3361 * The _res_opcodes variable has been removed from libresolv. It had been
3362 exported by accident.
3364 * <string.h> no longer includes inline versions of any string functions,
3365 as this kind of optimization is better done by the compiler. The macros
3366 __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
3368 * The nonstandard header <xlocale.h> has been removed. Most programs should
3369 use <locale.h> instead. If you have a specific need for the definition of
3370 locale_t with no other declarations, please contact
3371 libc-alpha@sourceware.org and explain.
3373 * The obsolete header <sys/ultrasound.h> has been removed.
3375 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
3377 * The obsolete function cfree has been removed. Applications should use
3380 * The stack_t type no longer has the name struct sigaltstack. This changes
3381 the C++ name mangling for interfaces involving this type.
3383 * The ucontext_t type no longer has the name struct ucontext. This changes
3384 the C++ name mangling for interfaces involving this type.
3386 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
3387 the name struct fpregset. On Nios II GNU/Linux, the mcontext_t type no
3388 longer has the name struct mcontext. On SPARC GNU/Linux, the struct
3389 mc_fq, struct rwindow, struct fpq and struct fq types are no longer
3390 defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
3391 mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
3392 fpregset_t type no longer has the name struct fpu. This changes the C++
3393 name mangling for interfaces involving those types.
3395 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
3396 synced with the kernel:
3398 - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
3399 are not supported on this architecture and have been removed.
3401 - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
3402 PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
3403 PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
3405 Programs that assume the GET/SETREGS ptrace requests are universally
3406 available will now fail to build, instead of malfunctioning at runtime.
3408 Changes to build and runtime requirements:
3410 * Linux kernel 3.2 or later is required at runtime, on all architectures
3411 supported by that kernel. (This is a change from version 2.25 only for
3414 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
3416 * On most architectures, GCC 4.9 or later is required to build the GNU C
3417 Library. On powerpc64le, GCC 6.2 or later is required.
3419 Older GCC versions and non-GNU compilers are still supported when
3420 compiling programs that use the GNU C Library. (We do not know exactly
3421 how old, and some GNU extensions to C may be _de facto_ required. If you
3422 are interested in helping us make this statement less vague, please
3423 contact libc-alpha@sourceware.org.)
3425 Security related changes:
3427 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
3428 to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
3430 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
3431 mode to guard against local privilege escalation attacks (CVE-2017-1000366).
3433 * Avoid printing a backtrace from the __stack_chk_fail function since it is
3434 called on a corrupt stack and a backtrace is unreliable on a corrupt stack
3437 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
3438 fixed (CVE-2017-12133).
3440 The following bugs are resolved with this release:
3442 [984] network: Respond to changed resolv.conf in gethostbyname
3443 [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
3444 [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
3446 [12189] libc: __stack_chk_fail should not attempt a backtrace
3448 [14096] time: Race condition on timezone/tst-timezone.out
3449 [14172] localedata: az_IR: new locale
3450 [14995] build: glibc fails to build if gold is the default linker, even if
3452 [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
3453 [16637] network: inet_pton function is accepting IPv6 with bad format
3454 [16640] string: string/strtok.c: undefined behaviour inconsistent between
3455 x86 and other generic code
3456 [16875] localedata: ko_KR: fix lang_name
3457 [17225] localedata: ar_SY: localized month names for May and June are
3459 [17297] localedata: da_DK: wrong date_fmt string
3460 [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
3461 [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
3462 [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
3463 [19066] localedata: ar_SA abbreviated day and month names are in English
3464 [19569] network: resolv: Support an arbitrary number of search domains
3465 [19570] network: Implement random DNS server selection in the stub
3467 [19838] locale: localedef fails on PA-RISC
3468 [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
3469 order of 0D36 and 0D37
3470 [19922] localedata: iso14651_t1_common: Define collation for Malayalam
3472 [20098] libc: FAIL: debug/backtrace-tst on hppa
3473 [20257] network: sunrpc: clntudp_call does not enforce timeout when
3475 [20275] localedata: locale day/abday/mon/abmon should not have trailing
3477 [20313] localedata: Update locale data to Unicode 9.0
3478 [20424] manual: Document how to provide a malloc replacement
3479 [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
3481 [20686] locale: Add el_GR@euro to SUPPORTED.
3482 [20831] dynamic-link: _dl_map_segments does not test for __mprotect
3483 failures consistently
3484 [21015] dynamic-link: Document and fix --enable-bind-now
3485 [21016] nptl: pthread_cond support is broken on hppa
3486 [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
3487 frame-pointer on i386
3488 [21049] libc: segfault in longjmp_chk() due to clobbered processor
3490 [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
3491 [21088] libc: Build fails with --enable-static-nss
3492 [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
3493 generic c code is used
3494 [21109] libc: Tunables broken on big-endian
3495 [21112] math: powf has large ulp errors with base close to 1 and exponent
3497 [21115] network: sunrpc: Use-after-free in error path in clntudp_call
3499 [21120] malloc: glibc malloc is incompatible with GCC 7
3500 [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
3502 [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
3503 (-0.0) when linking with -lieee
3504 [21171] math: log10, log2 and lgamma return incorrect results
3505 [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
3506 [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
3507 [21207] localedata: ce_RU: update weekdays from CLDR
3508 [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
3509 [21217] localedata: Update months from CLDR-31
3510 [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
3511 [21243] libc: support_delete_temp_file should issue warning for failed
3513 [21244] libc: support resolv_test_start() socket fd close should be
3515 [21253] libc: localedef randomly segfaults when using -fstack-check due to
3516 new posix_spawn implementation
3517 [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
3518 leads to lower CPU frequency
3519 [21259] libc: [alpha] termios.h missing IXANY for POSIX
3520 [21261] libc: [sparc64] bits/setjmp.h namespace
3521 [21267] network: [mips] bits/socket.h IOC* namespace
3522 [21268] libc: [alpha] termios.h NL2, NL3 namespace
3523 [21270] libc: mmap64 silently truncates large offset values
3524 [21275] libc: posix_spawn always crashes on ia64 now
3525 [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
3526 [21280] math: [powerpc] logbl for POWER7 return incorrect results
3527 [21289] libc: Incorrect declaration for 32-bit platforms with
3528 _FILE_OFFSET_BITS=64 causes build error
3529 [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
3530 not support gethostbyname4_r
3531 [21298] nptl: rwlock can deadlock on frequent reader/writer phase
3533 [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
3535 [21340] libc: Support POSIX_SPAWN_SETSID
3536 [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
3537 [21359] network: ns_name_pack needs additional byte in destination buffer
3538 [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
3539 against fragmentation attacks (CVE-2017-12132)
3540 [21369] network: resolv: Remove EDNS fallback
3541 [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
3543 [21386] nptl: Assertion in fork for distinct parent PID is incorrect
3544 [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
3545 [21393] stdio: Missing dup3 error check in freopen, freopen64
3546 [21396] libc: Use AVX2 memcpy/memset on Skylake server
3547 [21399] localedata: Bad description for U00EC in
3548 localedata/charmaps/CP1254
3549 [21411] malloc: realloc documentation error
3550 [21426] network: sys/socket.h uio.h namespace
3551 [21428] libc: [aarch64] tst-backtrace5 testsuite failure
3552 [21445] libc: signal.h bsd_signal namespace
3553 [21455] network: Network headers stdint.h namespace
3554 [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
3556 [21475] network: resolv: Overlong search path is truncated mid-label
3557 [21511] libc: sigstack namespace
3558 [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
3559 [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
3560 bits/syscall.h: No such file or directory
3561 [21517] libc: struct sigaltstack namespace
3562 [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
3563 [21533] localedata: Update locale data to Unicode 10.0
3565 ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
3566 junk at end of line, first unrecognized character is `@'
3567 [21538] libc: SIG_HOLD missing for XPG4
3568 [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
3569 request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
3570 [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
3571 [21543] libc: sigevent namespace
3572 [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
3573 size for general purpose registers in mcontext_t structure
3574 [21550] libc: sigwait namespace
3575 [21552] libc: XPG4 bsd_signal namespace
3576 [21554] libc: sigpause namespace
3577 [21560] libc: sys/wait.h signal.h namespace
3578 [21561] libc: waitid namespace
3579 [21573] nptl: GCC 7: /usr/bin/install: cannot remove
3580 '/usr/include/stdlib.h': Permission denied
3581 [21575] libc: sys/wait.h missing struct rusage definition
3582 [21584] libc: sigaltstack etc namespace
3583 [21597] libc: siginterrupt namespace
3584 [21607] math: hppa: FAIL: math/test-tgmath
3585 [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
3587 [21622] libc: [tile] missing SA_* for POSIX.1:2008
3588 [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
3589 stack and heap (CVE-2017-1000366)
3590 [21625] libc: wait3 namespace
3591 [21654] nss: Incorrect pointer alignment in NSS group merge result
3593 [21657] network: Parse interface zone id for node-local multicast
3594 [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
3596 [21666] libc: .symver is used on common symbol
3597 [21668] network: resolv: res_init cross-thread broadcast introduces race
3599 [21687] math: tgmath.h totalorder, totalordermag return type
3600 [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
3602 [21696] libc: Incorrect assumption of of __cpu_mask in
3603 posix/sched_cpucount.c
3604 [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
3605 [21706] localedata: yesstr and nostr are missing for Breton [LC_MESSAGES]
3607 [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
3608 leading to relocation crash
3609 [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
3610 `resolv_conf_matches (resp, conf)' failed.
3611 [21710] localedata: Added Samoan language locale for Samoa
3612 [21711] localedata: Pashto yesstr/nostr locale are missing
3613 [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
3614 __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
3615 [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
3616 [21723] localedata: yesstr/nostr missing for Chinese language locale
3617 [21724] localedata: yesstr and nostr are missing for Xhosa [LC_MESSAGES]
3619 [21727] localedata: yesstr and nostr are missing for Tsonga [LC_MESSAGES]
3621 [21728] localedata: New Locale for Tongan language
3622 [21729] localedata: incorrect LC_NAME fields for hi_IN
3623 [21733] localedata: yesstr and nostr are missing for zh_HK
3624 [21734] localedata: Missing yesstr and nostr are for kw_GB
3625 [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
3626 [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
3627 [21742] libc: _dl_num_cache_relocations is undefined in libc.a
3628 [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
3630 [21744] libc: Tests failing on --enable-tunables --enable-stack-
3632 [21749] localedata: Wrong abbreviated day name (“abday”) for
3634 [21756] localedata: missing yesstr, nostr for nds_DE and nds_NL
3635 [21757] localedata: missing yesstr, nostr for pap_AW and pap_CW
3636 [21759] localedata: missing yesstr and nostr for Tigrinya
3637 [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
3638 [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
3639 [21767] localedata: Missing Bislama locales
3640 [21768] localedata: Missing yesstr and nostr for aa_ET
3641 [21770] localedata: Missing Field in li_NL
3642 [21778] nptl: Robust mutex may deadlock
3643 [21779] libc: MicroBlaze segfaults when loading libpthread
3644 [21783] localedata: Fix int_select international_call_prefixes
3645 [21784] localedata: Inconsistency in country_isbn
3646 [21788] localedata: Missing Country Postal Abbreviations
3647 [21794] localedata: Added-country_isbn-for-Italy
3648 [21795] localedata: Add/Fix country_isbn for France
3649 [21796] localedata: Added country_isbn for Republic of Korea
3650 [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
3651 [21799] localedata: Added int_select international_call_prefixes
3652 [21801] localedata: Added int_select international_call_prefixes
3653 [21804] nptl: Double semicolon in thread-shared-types.h
3654 [21807] localedata: LC_ADDRESS fix for pap_CW
3655 [21808] localedata: Fix LC_ADDRESS for pap_AW
3656 [21821] localedata: Added country_name in mai_IN
3657 [21822] localedata: Fix LC_TIME for mai_IN
3658 [21823] localedata: missing yesstr, nostr for sa_IN
3659 [21825] localedata: Fix name_mrs for mag_IN
3660 [21828] localedata: 2.26 changelog should mention user visible changes
3662 [21835] localedata: Added Maithili language locale for Nepal
3663 [21838] localedata: Removed redundant data for the_NP
3664 [21839] localedata: Fix LC_MONETARY for ta_LK
3665 [21844] localedata: Fix Latin characters and Months Sequence.
3666 [21848] localedata: Fix mai_NP Title Name
3671 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
3672 24731-2:2010, is supported to enable declarations of functions from that
3673 TR. Note that not all functions from that TR are supported by the GNU C
3676 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
3677 18661-1:2014, is supported to enable declarations of functions and macros
3678 from that TS. Note that not all features from that TS are supported by
3681 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
3682 18661-4:2015, is supported to enable declarations of functions and macros
3683 from that TS. Note that most features from that TS are not supported by
3686 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
3687 now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
3688 Since the GNU C Library defaults to a much newer revision of POSIX, this
3689 will only affect programs that specifically request an old conformance
3690 mode. For instance, a program compiled with -std=c89 -D_REENTRANT will
3691 see a change in the visible declarations, but a program compiled with
3692 just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
3695 Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
3696 defined by all multithreaded code, but glibc has not required this for
3699 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated. This
3700 means that in a future release, the macros “major”, “minor”, and “makedev”
3701 will only be available from <sys/sysmacros.h>.
3703 These macros are not part of POSIX nor XSI, and their names frequently
3704 collide with user code; see for instance glibc bug 19239 and Red Hat bug
3705 130601. <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
3706 presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
3709 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
3710 fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
3711 femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
3713 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
3714 CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
3715 UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
3716 <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
3717 INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
3718 UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
3719 INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
3720 UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
3721 UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
3722 UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
3723 UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
3726 * New <math.h> features are added from TS 18661-1:2014:
3728 - Signaling NaN macros: SNANF, SNAN, SNANL.
3730 - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
3731 fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
3732 fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
3734 - llogb functions: the llogb, llogbf and llogbl functions, and the
3735 FP_LLOGB0 and FP_LLOGBNAN macros.
3737 - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
3740 - Comparison macros: iseqsig.
3742 - Classification macros: iscanonical, issubnormal, iszero.
3744 - Total order functions: totalorder, totalorderf, totalorderl,
3745 totalordermag, totalordermagf, totalordermagl.
3747 - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
3749 - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
3750 setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
3752 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
3753 are added to libc. They convert a floating-point number into string.
3755 * Most of glibc can now be built with the stack smashing protector enabled.
3756 It is recommended to build glibc with --enable-stack-protector=strong.
3757 Implemented by Nick Alcock (Oracle).
3759 * The function explicit_bzero, from OpenBSD, has been added to libc. It is
3760 intended to be used instead of memset() to erase sensitive data after use;
3761 the compiler will not optimize out calls to explicit_bzero even if they
3762 are "unnecessary" (in the sense that no _correct_ program can observe the
3763 effects of the memory clear).
3765 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
3766 to float instead of double. This does not affect the ABI of any libraries
3767 that are part of the GNU C Library, but may affect the ABI of other
3768 libraries that use this type in their interfaces.
3770 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
3771 float_t and double_t types are now defined to long double instead of float
3772 and double. These options are not the default, and this does not affect
3773 the ABI of any libraries that are part of the GNU C Library, but it may
3774 affect the ABI of other libraries that use this type in their interfaces,
3775 if they are compiled or used with those options.
3777 * The getentropy and getrandom functions, and the <sys/random.h> header file
3780 * The buffer size for byte-oriented stdio streams is now limited to 8192
3781 bytes by default. Previously, on Linux, the default buffer size on most
3782 file systems was 4096 bytes (and thus remains unchanged), except on
3783 network file systems, where the buffer size was unpredictable and could be
3784 as large as several megabytes.
3786 * The <sys/quota.h> header now includes the <linux/quota.h> header. Support
3787 for the Linux quota interface which predates kernel version 2.4.22 has
3790 * The malloc_get_state and malloc_set_state functions have been removed.
3791 Already-existing binaries that dynamically link to these functions will
3792 get a hidden implementation in which malloc_get_state is a stub. As far
3793 as we know, these functions are used only by GNU Emacs and this change
3794 will not adversely affect already-built Emacs executables. Any undumped
3795 Emacs executables, which normally exist only during an Emacs build, should
3796 be rebuilt by re-running “./configure; make” in the Emacs build tree.
3798 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
3799 corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
3800 “no-ip6-dotint” had already been the default, and support for the
3801 “ip6-dotint” option was removed from the Internet in 2006.
3803 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
3804 flag from <resolv.h> have been removed. The option relied on a
3805 backwards-incompatible DNS extension which was never deployed on the
3808 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
3809 RES_BLAST defined in the <resolv.h> header file have been deprecated.
3810 They were already unimplemented.
3812 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
3813 _res.flags are deprecated. The flag was standardized in RFC 2133, but
3814 removed again from the IETF name lookup interface specification in RFC
3815 2553. Applications should use getaddrinfo instead.
3817 * DNSSEC-related declarations and definitions have been removed from the
3818 <arpa/nameser.h> header file, and libresolv will no longer attempt to
3819 decode the data part of DNSSEC record types. Previous versions of glibc
3820 only implemented minimal support for the previous version of DNSSEC, which
3821 is incompatible with the currently deployed version.
3823 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
3824 ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
3825 <arpa/nameser.h> header file because the distinction between RR types and
3826 meta-RR types is not officially standardized, subject to revision, and
3827 thus not suitable for encoding in a macro.
3829 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
3830 and rhook members of the res_state type in <resolv.h> have been removed.
3831 The glibc stub resolver did not support these hooks, but the header file
3832 did not reflect that.
3834 * For multi-arch support it is recommended to use a GCC which has
3835 been built with support for GNU indirect functions. This ensures
3836 that correct debugging information is generated for functions
3837 selected by IFUNC resolvers. This support can either be enabled by
3838 configuring GCC with '--enable-gnu-indirect-function', or by
3839 enabling it by default by setting 'default_gnu_indirect_function'
3840 variable for a particular architecture in the GCC source file
3843 * GDB pretty printers have been added for mutex and condition variable
3844 structures in POSIX Threads. When installed and loaded in gdb these pretty
3845 printers show various pthread variables in human-readable form when read
3846 using the 'print' or 'display' commands in gdb.
3848 * Tunables feature added to allow tweaking of the runtime for an application
3849 program. This feature can be enabled with the '--enable-tunables' configure
3850 flag. The GNU C Library manual has details on usage and README.tunables has
3851 instructions on adding new tunables to the library.
3853 * A new version of condition variables functions have been implemented in
3854 the NPTL implementation of POSIX Threads to provide stronger ordering
3857 * A new version of pthread_rwlock functions have been implemented to use a more
3858 scalable algorithm primarily through not using a critical section anymore to
3861 Security related changes:
3863 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
3864 have been created with makecontext could fail to terminate due to a
3865 missing .cantunwind annotation. This has been observed to lead to a hang
3866 (denial of service) in some Go applications compiled with gccgo. Reported
3867 by Andreas Schwab. (CVE-2016-6323)
3869 * The DNS stub resolver functions would crash due to a NULL pointer
3870 dereference when processing a query with a valid DNS question type which
3871 was used internally in the implementation. The stub resolver now uses a
3872 question type which is outside the range of valid question type values.
3875 The following bugs are resolved with this release:
3877 [4099] stdio: Overly aggressive caching by stream i/o functions.
3878 [7065] build: Support building glibc with -fstack-protector or -fstack-
3880 [9842] localedata: en_CA: incorrect date format
3881 [13165] nptl: pthread_cond_wait() can consume a signal that was sent
3882 before it started waiting
3883 [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
3884 [15765] nptl: sem_open is wrongly a cancellation point
3885 [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
3886 [16458] libc: endian.h and netinet/in.h byte order macros return values of
3888 [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
3889 library linked with pthread
3890 [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
3891 "FIXME: Ingo" issue)
3892 [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
3893 [17252] libc: getrandom and getentropy syscall
3894 [17730] malloc: thread-local storage is sometimes improperly free()'d
3895 after being __libc_memalign()'d
3896 [18241] stdio: failed fseek on memstream does not set errno and can fail
3898 [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
3900 [18463] nptl: pthread_cond_broadcast issue when surrounded by
3901 PTHREAD_PRIO_INHERIT mutex on ARM
3902 [18784] network: res_query and related function crash for special record
3903 type queries (CVE-2015-5180)
3904 [19380] math: strtod does not raise "inexact"
3905 [19387] string: Integer overflow in memchr
3906 [19390] string: Integer overflow in strncat
3907 [19398] build: linknamespace tests fail with massively parallel build
3908 [19402] nptl: Deadlock with robust shared mutex and asynchronous
3910 [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
3911 [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
3912 [19514] libc: [PATCH] Fix spelling errors in spelling
3913 "implement"/"implementation" in several places
3914 [19582] network: Deprecate RES_USE_INET6
3915 [19673] manual: clog10 docs appear to be erroneous
3916 [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
3917 causes a segmentation fault
3918 [19826] libc: invalid pointer returned from __tls_get_addr with static
3920 [20016] network: resolv: Remove hooks support from the API
3921 [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
3923 [20033] math: [x86_64] vectorized math function don't call the __finite
3925 [20116] nptl: use after free in pthread_create
3926 [20181] stdio: open_memstream(): writes not at end of stream corrupt data
3927 [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
3929 [20311] nptl: please install proc_service.h
3930 [20366] libc: Compilation errors in installed headers in strict-compliance
3932 [20370] malloc: malloc: Arena free list management is still racy
3933 (incorrect fix in bug 19243)
3934 [20386] libc: assert (X = 0) does not result in GCC warning
3935 [20432] malloc: malloc: Minimize interface required for interposition
3936 [20435] libc: Missing unwind info in __startcontext causes infinite loop
3937 in _Unwind_Backtrace (CVE-2016-6323)
3938 [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
3939 [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
3941 [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
3942 [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
3943 [20477] network: resolv: incorrect double-checked locking related to
3945 [20478] libc: libc_ifunc macro and similar usages leads to false debug-
3947 [20495] math: x86_64 performance degradation due to AVX/SSE transition
3949 [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
3950 [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
3951 cause transition penalty
3952 [20517] math: sparcv9 missing fdiml compat symbol
3953 [20524] manual: strverscmp is inconsistent
3954 [20525] libc: <sys/quota.h> should be based on kernel headers
3955 [20539] math: GCC 7 -static -lm fails to link at -O3
3956 [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
3958 [20558] string: POSIX bcopy/bzero decls do not implement Object Size
3960 [20591] network: Remove obsolete DNSSEC support
3961 [20592] network: DNS resource record type classification macros in
3962 <arpa/nameser.h> are incorrect
3963 [20593] network: Update DNS RR type definitions
3964 [20611] network: getaddrinfo accepts invalid numeric scope IDs
3965 [20615] build: glibc build fails when using --with-cpu=power9 --enable-
3967 [20629] network: libresolv: Remove support for bitstring labels
3969 [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
3970 assertion: "maxidx >= 2"
3971 [20660] math: [arm] Use VSQRT
3972 [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
3973 -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
3974 [20689] libc: Test for FMA should also check for AVX.
3975 [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
3976 [20715] math: iszero macro breaks existing code
3977 [20718] math: [powerpc] copysignl raises "invalid" for sNaN
3978 [20728] libc: powerpc: Missing TOC stub in clone
3979 [20729] build: glibc-2.24 fails to build for i486 with -Os
3980 [20750] build: Build fails with default PIE enabled gcc-6.x
3981 [20768] math: [alpha] sqrt fegetenv namespace
3982 [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
3984 [20787] math: float_t is defined as float incorrectly on x86_64 even if
3985 __FLT_EVAL_METHOD__ is 2
3986 [20790] network: rpcgen buffer overrun in get_prog_declaration
3987 [20822] nptl: race condition in __lll_unlock_elision on powerpc
3988 [20829] libc: crypt snprintf namespace
3989 [20847] libc: tst-vfork3 failure
3990 [20855] math: Default bits/mathdef.h has inappropriate float_t
3991 [20859] math: [sh4] FP_ILOGB0 invalid
3992 [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
3993 U+20AC), not same as GBK
3994 [20915] dynamic-link: global-dynamic TLS broken on aarch64
3995 [20916] math: pow handling of sNaN arguments
3996 [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
3997 [20919] math: Bad pow (qNaN, 0) result with -lieee
3998 [20940] math: hypot sNaN handling
3999 [20947] math: fmax, fmin sNaN handling
4000 [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
4001 [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
4003 [20971] string: powerpc64/power7 memchr overflows internal pointer check
4004 [20973] nptl: robust mutexes: Lost wake-ups
4005 [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
4006 [20978] nis: strlen on null pointer in nss_nisplus
4007 [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
4009 [21014] string: i686 memchr overflows internal pointer check
4010 [21019] libc: [mips] n32 lseek incorrect on overflow
4011 [21022] libc: [microblaze] __backtrace get_frame_size namespace
4012 [21026] libc: [MIPS] readahead syscall is broken on n64
4013 [21028] math: Fallback fesetexceptflag should always succeed
4014 [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
4015 [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
4017 [21053] libc: [SH] Namespace pollution from sys/ucontext.h
4018 [21061] librt: [microblaze] librt lost clock_* exports
4019 [21073] libc: tunables: insecure environment variables passed to
4020 subprocesses with AT_SECURE
4021 [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
4025 * The minimum Linux kernel version that this version of the GNU C Library
4026 can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
4027 kernel version 2.6.32 or later suffices (on architectures that already
4028 required kernel versions more recent than 3.2, those requirements remain
4029 unchanged). Linux 3.2 or later kernel headers are required on all
4032 * The pap_AN locale has been deleted. This has been deprecated for a long
4033 time. It has been replaced by pap_AW & pap_CW, both of which have long
4034 been included in previous releases.
4036 * The readdir_r and readdir64_r functions have been deprecated. It is
4037 recommended to use readdir and readdir64 instead.
4039 * The type “union wait” has been removed. It was deprecated in the early
4040 1990s and never part of POSIX. Application code should use the int type
4041 instead of “union wait”.
4043 * A new NSS action is added to facilitate large distributed system
4044 administration. The action, MERGE, allows remote user stores like LDAP
4045 to be merged into local user stores like /etc/groups in order to provide
4046 easy to use, updated, and managed sets of merged credentials. The new
4047 action can be used by configuring it in /etc/nsswitch.conf:
4048 group: files [SUCCESS=merge] nis
4049 Implemented by Stephen Gallagher (Red Hat).
4051 * The deprecated __malloc_initialize_hook variable has been removed from the
4054 * The long unused localedef --old-style option has been removed. It hasn't
4055 done anything in over 16 years. Scripts using this option can safely
4058 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
4059 libm. They are defined by TS 18661 and IEEE754-2008. The nextup functions
4060 return the next representable value in the direction of positive infinity
4061 and the nextdown functions return the next representable value in the
4062 direction of negative infinity. These are currently enabled as GNU
4065 Security related changes:
4067 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed. It
4068 could result in a stack overflow when getnetbyname was called with an
4069 overly long name. (CVE-2016-3075)
4071 * Previously, getaddrinfo copied large amounts of address data to the stack,
4072 even after the fix for CVE-2013-4458 has been applied, potentially
4073 resulting in a stack overflow. getaddrinfo now uses a heap allocation
4074 instead. Reported by Michael Petlan. (CVE-2016-3706)
4076 * The glob function suffered from a stack-based buffer overflow when it was
4077 called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
4078 Reported by Alexander Cherepanov. (CVE-2016-1234)
4080 * The Sun RPC UDP client could exhaust all available stack space when
4081 flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
4082 alloca plugin for GCC. (CVE-2016-4429)
4084 * The IPv6 name server management code in libresolv could result in a memory
4085 leak for each thread which is created, performs a failing naming lookup,
4086 and exits. Over time, this could result in a denial of service due to
4087 memory exhaustion. Reported by Matthias Schiffer. (CVE-2016-5417)
4089 The following bugs are resolved with this release:
4091 [1170] localedata: ne_NP: update Nepali locale definition file
4092 [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
4094 [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
4095 [6796] math: fdim() does not set errno on overflow
4096 [10354] libc: posix_spawn should use vfork() in more cases than presently
4097 [11213] localedata: localedata: add copyright disclaimer to locale files
4098 [12143] localedata: chr_US: new Cherokee locale
4099 [12450] localedata: sgs_LT: new locale
4100 [12676] localedata: ln_CD: new locale
4101 [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
4103 [13304] math: fma, fmaf, fmal produce wrong results
4104 [14259] build: --localedir arg to configure is ignored
4105 [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
4106 [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
4107 [14934] localedata: es_CL: wrong first weekday chilean locale
4108 [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
4110 [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
4112 [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
4113 [15368] nptl: raise() is not async-signal-safe
4114 [15479] math: ceil, floor, round and trunc raise inexact exception
4115 [15578] localedata: kk_KZ: various updates
4116 [16003] localedata: pap_AN: punt old locale
4117 [16137] localedata: iw_IL: punt old locale
4118 [16190] localedata: eo: new esperanto locale
4119 [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
4120 [16742] malloc: race condition: pthread_atfork() called before first
4121 malloc() results in unexpected locking behaviour/deadlocks
4122 [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
4124 [16983] localedata: postal_fmt does not allow %l and %n modifiers
4125 [17565] localedata: pt_PT: wrong (work-)week start
4126 [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
4127 [17950] build: Build fails with -msse
4128 [18205] localedata: be_BY*: wrong first_weekday and first_workday
4129 [18433] libc: posix_spawn does not return correctly upon failure to
4131 [18453] localedata: charmaps/IBM875: incorrect codes
4132 [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
4134 [18896] localedata: he_IL: improvements for currency
4135 [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
4136 Romanian locale data
4137 [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
4139 [19056] libc: Deprecate readdir_r
4140 [19133] localedata: pt_*: days & months should be lowercase in Portuguese
4142 [19198] localedata: nl_NL: small improvements for Dutch locales
4143 [19257] network: Per-thread memory leak in __res_vinit with IPv6
4144 nameservers (CVE-2016-5417)
4145 [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
4147 [19400] locale: Language missing in "iso-639.def", trivial fix in
4149 [19431] malloc: Deadlock between fflush, getdelim, and fork
4150 [19505] libc: Incorrect file descriptor validity checks in
4151 posix_spawn_file_actions_add{open,close,dup2}
4152 [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
4153 when using RTLD_NEXT
4154 [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
4155 `intl/{gettextP,loadinfo}.h'
4156 [19534] libc: execle, execlp may use malloc
4157 [19568] localedata: *_CH: Swiss locales have inconsistent start of week
4158 [19573] network: res_nclose and __res_maybe_init disagree about name
4159 server initialization, breaking Hesiod
4160 [19575] localedata: Status of GB18030 tables
4161 [19581] localedata: sr_* date_fmt string contains additional newline
4162 [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
4164 [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
4165 [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
4166 [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
4167 [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
4169 [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
4171 [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
4173 [19610] dynamic-link: ldconfig -X removes stale symbolic links
4174 [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
4175 [19633] locale: strfmon_l applies global locale to number formatting
4176 [19642] network: Memory leak in getnameinfo
4177 [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
4178 [19653] libc: Potential for NULL pointer dereference (CWE-476) in
4180 [19654] math: [x86_64] Need testcase for BZ #19590 fix
4181 [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
4183 [19674] math: [ldbl-128ibm] powl incorrect overflow handling
4184 [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
4186 [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
4188 [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
4190 [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
4191 pointers and lengths in error-case.
4192 [19727] locale: Converting from/to UTF-xx with iconv() does not always
4193 report errors on UTF-16 surrogates values.
4194 [19755] nscd: nscd assertion failure in gc
4195 [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
4196 [19759] libc: mempcpy shouldn't be inlined
4197 [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
4198 [19765] libc: s390 needs an optimized mempcpy
4199 [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
4200 NAME_MAX limit assumption (CVE-2016-1234)
4201 [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
4202 [19787] network: Missing and incorrect truncation checks in getnameinfo
4203 [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
4205 [19791] network: Assertion failure in res_query.c with un-connectable name
4207 [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
4208 [19822] math: libm.so install clobbers old version
4209 [19825] network: resolv: send_vc can return uninitialized data in second
4210 response to getaddrinfo
4211 [19830] network: nss_dns: should check RDATA length against buffer length
4212 [19831] network: nss_dns: getaddrinfo returns uninitialized data when
4213 confronted with A/AAAA records of invalid size
4214 [19837] nss: nss_db: No retries for some long lines with a larger buffer
4215 [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
4216 [19853] stdio: Printing IBM long double in decimal with high precision is
4218 [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
4219 [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
4220 [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
4222 [19865] network: Assertion failure or memory leak in
4223 _nss_dns_getcanonname_r
4224 [19868] network: nss_dns: netent code does not skip over non-PTR records
4225 [19879] network: nss_dns: Stack overflow in getnetbyname implementation
4227 [19881] string: Improve x86-64 memset
4228 [19907] string: Incorrect memcpy tests
4229 [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
4231 [19925] libc: termios.h XCASE namespace
4232 [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
4233 [19929] libc: limits.h NL_NMAX namespace
4234 [19931] stdio: Memory leak in vfprintf
4235 [19957] libc: clone(CLONE_VM) access invalid parent memory
4236 [19963] localedata: en_IL: New locale
4237 [19989] stdio: stdio.h cuserid namespace
4238 [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
4240 [19996] locale: langinfo.h nl_langinfo_l namespace
4241 [20005] stdio: fflush on a file opened with fmemopen resets position to 0
4242 [20010] network: getaddrinfo: Stack overflow in hostent translation
4244 [20012] stdio: libio: fmemopen append mode failure
4245 [20014] stdio: stdio.h namespace for pre-threads POSIX
4246 [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
4247 [20023] libc: fcntl.h timespec namespace
4248 [20024] math: [x86_64] vectorized sincos trashes the stack
4249 [20031] network: nss_hesiod: Heap overflow in get_txt_records
4250 [20041] time: sys/time.h timespec namespace
4251 [20043] libc: unistd.h missing cuserid for UNIX98 and before
4252 [20044] libc: unistd.h missing pthread_atfork for UNIX98
4253 [20051] libc: ttyslot in wrong header under wrong conditions
4254 [20054] libc: gethostname not declared for XPG4
4255 [20055] libc: termios.h missing tcgetsid for XPG4
4256 [20072] dynamic-link: x86 init_cpu_features is called twice in static
4258 [20073] libc: sys/stat.h fchmod namespace
4259 [20074] libc: stdlib.h rand_r namespace
4260 [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
4261 [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
4263 [20111] libc: struct sockaddr_storage cannot be aggregate-copied
4264 [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
4266 [20115] string: Extra alignment in memset-vec-unaligned-erms.S
4267 [20119] libc: Wrong mask for processors level type from CPUID
4268 [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
4269 AS not supporting AVX512
4270 [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
4272 [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
4273 [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
4275 [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
4276 [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
4277 [20178] libc: posix_spawn{p} should not call exit
4278 [20191] stdio: libio: vtables hardening
4279 [20195] string: FMA4 detection requires CPUID execution with register
4281 [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
4282 [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
4284 [20212] math: acos (sNaN) returns sNaN
4285 [20213] math: asin (sNaN) returns sNaN
4286 [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
4287 [20218] math: [i386] asinhl (sNaN) returns sNaN
4288 [20219] math: [i386] atanhl (sNaN) returns sNaN
4289 [20222] stdio: fopencookie: Mangle function pointers
4290 [20224] math: [i386] cbrtl (sNaN) returns sNaN
4291 [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
4292 [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
4294 [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
4295 [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
4296 [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
4297 [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
4298 [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
4299 [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
4300 [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
4301 [20237] nss: nss_db: get*ent segfaults without preceding set*ent
4302 [20240] math: modf (sNaN) returns sNaN
4303 [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
4304 [20250] math: frexp (sNaN) returns sNaN
4305 [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
4306 [20255] math: [i386] fdim, fdimf return with excess range and precision /
4308 [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
4309 [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
4310 subscript is below array bounds [-Werror=array-bounds]
4311 [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
4312 [20263] nptl: robust mutex deadlocks if other thread requests timedlock
4314 [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
4315 [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
4317 [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
4318 "invalid" exceptions
4319 [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
4320 [20316] localedata: id_ID: Februari instead of Pebruari
4321 [20327] string: POWER8 strcasecmp returns incorrect result
4322 [20347] math: Failure: Test: j0_downward (0xap+0)
4323 [20348] libc: FAIL: misc/tst-preadvwritev64
4324 [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
4325 [20350] libc: There is no test for p{read,write}64
4326 [20357] math: Incorrect cos result for 1.5174239687223976
4327 [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
4331 * Unicode 8.0.0 Support: Character encoding, character type info, and
4332 transliteration tables are all updated to Unicode 8.0.0, using new
4333 and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
4334 These updates cause user visible changes, such as the fixes for bugs
4335 89, 16061, and 18568.
4337 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
4338 kernel-internal CPU set size. This means that requests that change the
4339 CPU affinity which failed before (for example, an all-ones CPU mask) will
4340 now succeed. Applications that need to determine the effective CPU
4341 affinities need to call sched_getaffinity or pthread_getaffinity_np after
4342 setting it because the kernel can adjust it (and the previous size check
4343 would not detect this in the majority of cases).
4345 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64. With LFS
4346 the following new symbols are used: fts64_children, fts64_close,
4347 fts64_open, fts64_read and fts64_set.
4349 * getaddrinfo now detects certain invalid responses on an internal netlink
4350 socket. If such responses are received, an affected process will
4351 terminate with an error message of "Unexpected error <number> on netlink
4352 descriptor <number>" or "Unexpected netlink response of size <number> on
4353 descriptor <number>". The most likely cause for these errors is a
4354 multi-threaded application which erroneously closes and reuses the netlink
4355 file descriptor while it is used by getaddrinfo.
4357 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
4358 glibc 2.10 via --enable-experimental-malloc (2009), could result in the
4359 unnecessary serialization of memory allocation requests across threads.
4360 The defect is now corrected. Users should see a substantial increase in
4361 the concurent throughput of allocation requests for applications which
4362 trigger this bug. Affected applications typically create and
4363 destroy threads frequently. (Bug 19048 was reported and analyzed by
4366 * There is now a --disable-timezone-tools configure option for disabling the
4367 building and installing of the timezone related utilities (zic, zdump, and
4368 tzselect). This is useful for people who build the timezone data and code
4369 independent of the GNU C Library.
4371 * The obsolete header <regexp.h> has been removed. Programs that require
4372 this header must be updated to use <regex.h> instead.
4374 * The obsolete functions bdflush, create_module, get_kernel_syms,
4375 query_module and uselib are no longer available to newly linked binaries;
4376 the header <sys/kdaemon.h> has been removed. These functions and header
4377 were specific to systems using the Linux kernel and could not usefully be
4378 used with the GNU C Library on systems with version 2.6 or later of the
4381 * Optimized string, wcsmbs and memory functions for IBM z13.
4382 Implemented by Stefan Liebler.
4384 * Newly linked programs that define a variable called signgam will no longer
4385 have it set by the lgamma, lgammaf and lgammal functions. Programs that
4386 require signgam to be set by those functions must ensure that they use the
4387 variable provided by the GNU C Library and declared in <math.h>, without
4388 defining their own copy.
4390 * The minimum GCC version that can be used to build this version of the GNU
4391 C Library is GCC 4.7. Older GCC versions, and non-GNU compilers, can
4392 still be used to compile programs using the GNU C Library.
4394 Security related changes:
4396 * An out-of-bounds value in a broken-out struct tm argument to strftime no
4397 longer causes a crash. Reported by Adam Nielsen. (CVE-2015-8776)
4399 * The LD_POINTER_GUARD environment variable can no longer be used to disable
4400 the pointer guard feature. It is always enabled. Previously,
4401 LD_POINTER_GUARD could be used to disable security hardening in binaries
4402 running in privileged AT_SECURE mode. Reported by Hector Marco-Gisbert.
4405 * An integer overflow in hcreate and hcreate_r could lead to an
4406 out-of-bounds memory access. Reported by Szabolcs Nagy. (CVE-2015-8778)
4408 * The catopen function no longer has unbounded stack usage. Reported by
4409 Max. (CVE-2015-8779)
4411 * The nan, nanf and nanl functions no longer have unbounded stack usage
4412 depending on the length of the string passed as an argument to the
4413 functions. Reported by Joseph Myers. (CVE-2014-9761)
4415 * A stack-based buffer overflow was found in libresolv when invoked from
4416 libnss_dns, allowing specially crafted DNS responses to seize control
4417 of execution flow in the DNS client. The buffer overflow occurs in
4418 the functions send_dg (send datagram) and send_vc (send TCP) for the
4419 NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
4420 family. The use of AF_UNSPEC triggers the low-level resolver code to
4421 send out two parallel queries for A and AAAA. A mismanagement of the
4422 buffers used for those queries could result in the response of a query
4423 writing beyond the alloca allocated buffer created by
4424 _nss_dns_gethostbyname4_r. Buffer management is simplified to remove
4425 the overflow. Thanks to the Google Security Team and Red Hat for
4426 reporting the security impact of this issue, and Robert Holiday of
4427 Ciena for reporting the related bug 18665. (CVE-2015-7547)
4429 The following bugs are resolved with this release:
4431 [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
4432 [887] math: Math library function "logb" and "nextafter" inconsistent
4433 [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
4434 [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
4435 [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
4436 [2898] libc: [improve] warning: the use of `mktemp' is dangerous, better
4438 [4404] localedata: German translation of "Alarm clock" is misleading
4439 [6799] math: nextafter() and nexttoward() doen't set errno on
4440 overflow/underflow errors
4441 [6803] math: scalb(), scalbln(), scalbn() do not set errno on
4443 [10432] nis: _nss_nis_setnetgrent assertion failure
4444 [11460] libc: fts has no LFS support
4445 [12926] network: getaddrinfo()/make_request() may spin forever
4446 [13065] nptl: Race condition in pthread barriers
4447 [13690] nptl: pthread_mutex_unlock potentially cause invalid access
4448 [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
4450 [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
4451 [14912] libc: Rename non-installed bits/*.h headers
4452 [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
4453 [15367] math: Let gcc use __builtin_isinf
4454 [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
4455 [15421] math: lgamma wrongly sets signgam for ISO C
4456 [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
4457 FE_INVALID with argument out of range
4458 [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
4460 [15786] dynamic-link: ifunc resolver functions can smash function
4462 [15918] math: Unnecessary check for equality in hypotf()
4463 [16061] localedata: Review / update transliteration data
4464 [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
4466 [16141] time: strptime %z offset restriction
4467 [16171] math: drem should be alias of remainder
4468 [16296] math: fegetround is pure?
4469 [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
4470 [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
4472 [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
4473 [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
4475 [16422] math: [powerpc] math-float, math-double failing llrint tests with
4476 "Exception "Inexact" set" on ppc32
4477 [16495] localedata: nl_NL: date_fmt: shuffle year/month around
4478 [16517] math: Missing underflow exception from tanf/tan/tanl
4479 [16519] math: Missing underflow exception from sinhf
4480 [16520] math: Missing underflow exception from tanhf
4481 [16521] math: Missing underflow exception from exp2
4482 [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
4484 [16734] stdio: fopen calls mmap to allocate its buffer
4485 [16961] math: nan function incorrect handling of bad sequences
4486 [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
4487 [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
4488 [16985] locale: localedef: confusing error message when opening output
4490 [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
4491 [17197] locale: Redundant shift character in iconv conversion output at
4493 [17243] libc: trunk/posix/execl.c:53: va_args problem ?
4494 [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
4495 [17250] dynamic-link: static linking breaks nss loading
4496 (getaddrinfo/getpwnam/etc...)
4497 [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
4499 [17441] math: isnan() should use __builtin_isnan() in GCC
4500 [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
4501 (related to lock elision)
4502 [17787] manual: Exponent on page 324 of the PDF ends prematurely
4503 [17886] time: strptime should be able to parse "Z" as a timezone with %z
4504 [17887] time: strptime should be able to parse "+01:00" style timezones
4505 [17905] libc: catopen() Multiple unbounded stack allocations
4507 [18084] libc: backtrace (..., 0) dumps core on x86
4508 [18086] libc: nice() sets errno to 0 on success
4509 [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
4510 is too large (CVE-2015-8778)
4511 [18251] dynamic-link: SONAME missing when audit modules provides path
4512 [18265] libc: add attributes for wchar string and memory functions
4513 [18370] math: csqrt missing underflows
4514 [18421] libc: [hppa] read-only segment has dynamic relocations
4515 [18472] libc: Obsolete syscall wrappers should be compat symbols
4516 [18480] libc: hppa glibc miscompilation in sched_setaffinity()
4517 [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
4518 [18525] localedata: Remove locale timezone information
4519 [18560] libc: [powerpc] spurious bits/ipc.h definitions
4520 [18568] localedata: Update locale data to Unicode 8.0
4521 [18589] locale: sort-test.sh fails at random
4522 [18595] math: ctan, ctanh missing underflows
4523 [18604] libc: assert macro-expands its argument
4524 [18610] math: S390: fetestexcept() reports any exception if DXC-code
4525 contains a vector instruction exception.
4526 [18611] math: j1, jn missing errno setting on underflow
4527 [18618] localedata: sync Chechen locale definitions with other *_RU
4529 [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
4530 [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
4531 [18665] network: In send_dg, the recvfrom function is NOT always using the
4532 buffer size of a newly created buffer (CVE-2015-7547)
4533 [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
4535 [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
4537 [18681] libc: regexp.h is obsolete and buggy, and should be desupported
4538 [18699] math: tilegx cproj() for various complex infinities does not yield
4540 [18724] libc: Harden put*ent functions against data injection
4541 [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
4542 [18755] build: build errors with -DNDEBUG
4543 [18757] stdio: fmemopen fails to set errno on failure
4544 [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
4546 [18781] libc: openat64 lacks O_LARGEFILE
4547 [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
4548 error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
4549 [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
4550 [18790] math: [ldbl-128ibm] tanhl inaccurate
4551 [18795] libc: stpncpy fortification misses buffer lengths that are
4552 statically too large
4553 [18796] build: build fails for --disable-mathvec
4554 [18803] math: hypot missing underflows
4555 [18820] stdio: fmemopen may leak memory on failure
4556 [18823] math: csqrt spurious underflows
4557 [18824] math: fma spurious underflows
4558 [18825] math: pow missing underflows
4559 [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
4560 [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
4561 [18870] build: sem_open.c fails to compile with missing symbol
4563 [18872] stdio: Fix memory leak in printf_positional
4564 [18873] libc: posix_fallocate overflow check ineffective
4565 [18875] math: Excess precision leads incorrect libm
4566 [18877] libc: arm: mmap offset regression
4567 [18887] libc: memory corruption when using getmntent on blank lines
4568 [18918] localedata: hu_HU: change time to HH:MM:SS format
4569 [18921] libc: Regression: extraneous stat() and fstat() performed by
4571 [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
4572 binaries (CVE-2015-8777)
4573 [18951] math: tgamma missing underflows
4574 [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
4576 [18953] localedata: lt_LT: change currency symbol to the euro
4577 [18956] math: powf inaccuracy
4578 [18961] math: [i386] exp missing underflows
4579 [18966] math: [i386] exp10 missing underflows
4580 [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
4581 [18969] build: multiple string test failures due to missing locale
4583 [18970] libc: Reference of pthread_setcancelstate in libc.a
4584 [18977] math: float / long double Bessel functions not in XSI POSIX
4585 [18980] math: i386 libm functions return with excess range and precision
4586 [18981] math: i386 scalb*, ldexp return with excess range and precision
4587 [18982] stdio: va_list and vprintf
4588 [18985] time: Passing out of range data to strftime() causes a segfault
4590 [19003] math: [x86_64] fma4 version of pow inappropriate contraction
4591 [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
4592 [19012] locale: iconv_open leaks memory on error path
4593 [19016] math: clog, clog10 inaccuracy
4594 [19018] nptl: Mangle function pointers in tls_dtor_list
4595 [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
4596 [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
4597 [19048] malloc: malloc: arena free list can become cyclic, increasing
4599 [19049] math: [powerpc] erfc incorrect zero sign
4600 [19050] math: [powerpc] log* incorrect zero sign
4601 [19058] math: [x86_64] Link fail with -fopenmp and -flto
4602 [19059] math: nexttoward overflow incorrect in non-default rounding modes
4603 [19071] math: ldbl-96 lroundl incorrect just below powers of 2
4604 [19074] network: Data race in _res_hconf_reorder_addrs
4605 [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
4606 [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
4607 [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
4609 [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
4611 [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
4612 [19086] manual: posix_fallocate64 documented argument order is wrong.
4613 [19088] math: lround, llround missing exceptions close to overflow
4615 [19094] math: lrint, llrint missing exceptions close to overflow threshold
4616 [19095] math: dbl-64 lrint incorrect for 64-bit long
4617 [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
4618 [19124] dynamic-link: ld.so failed to build with older assmebler
4619 [19125] math: [powerpc32] llroundf, llround incorrect exceptions
4620 [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
4621 [19134] math: [powerpc32] lround, lroundf spurious exceptions
4622 [19137] libc: i386/epoll_pwait.S doesn't support cancellation
4623 [19143] nptl: Remove CPU set size checking from sched_setaffinity,
4624 pthread_setaffinity_np
4625 [19156] math: [ldbl-128] j0l spurious underflows
4626 [19164] nptl: tst-getcpu fails with many possible CPUs
4627 [19168] math: math/test-ildoubl and math/test-ldouble failure
4628 [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
4629 [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
4631 [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
4632 (FE_NOMASK_ENV) do not clear SSE exceptions
4633 [19182] malloc: malloc deadlock between ptmalloc_lock_all and
4634 _int_new_arena/reused_arena
4635 [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
4636 [19201] math: dbl-64 remainder incorrect sign of zero result
4637 [19205] math: bits/math-finite.h conditions do not match math.h and
4639 [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
4640 [19211] math: lgamma functions do not set signgam for -ffinite-math-only
4641 for C99-based standards
4642 [19212] libc: features.h not -Wundef clean
4643 [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
4645 [19214] libc: Family and model identification for AMD CPU's are incorrect.
4646 [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
4647 [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
4649 [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
4650 "inexact" exceptions
4651 [19238] math: [powerpc] round, roundf spurious "inexact" for integer
4653 [19242] libc: strtol incorrect in Turkish locales
4654 [19243] malloc: reused_arena can pick an arena on the free list, leading
4655 to an assertion failure and reference count corruption
4656 [19253] time: tzset() ineffective when temporary TZ did not include DST
4658 [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
4659 [19270] math: [hppa] Shared libm missing __isnanl
4660 [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
4661 MAP_HUGETLB and MAP_STACK defines
4662 [19313] nptl: Wrong __cpu_mask for x32
4663 [19347] libc: grantpt: try to force a specific gid even without pt_chown
4664 [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
4665 [19350] math: [ldbl-128ibm] sinhl spurious overflows
4666 [19351] math: [ldbl-128ibm] logl inaccurate near 1
4667 [19363] time: x32: times() return value wrongly truncates/sign extends
4669 [19367] dynamic-link: Improve branch prediction on Silvermont
4670 [19369] network: Default domain name not reset by res_ninit when "search"
4671 / "domain" entry is removed from resolv.conf
4672 [19375] math: powerpc: incorrect results for POWER7 logb with negative
4674 [19385] localedata: bg_BG: time separator should be colon, not comma
4675 [19408] libc: linux personality syscall wrapper may erroneously return an
4676 error on 32-bit architectures
4677 [19415] libc: dladdr returns wrong names on hppa
4678 [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
4679 IBM905, IBM907, and IBM909
4680 [19439] math: Unix98 isinf and isnan functions conflict with C++11
4681 [19443] build: build failures with -DDEBUG
4682 [19451] build: Make check fails on test-double-vlen2
4683 [19462] libc: Glibc failed to build with -Os
4684 [19465] math: Wrong code with -Os
4685 [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
4687 [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
4689 [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
4690 [19486] math: S390: Math tests fail with "Exception Inexact set".
4691 [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
4692 [19550] libc: [mips] mmap negative offset handling inconsistent with other
4694 [19590] math: Fail to build shared objects that use libmvec.so functions.
4698 * The following bugs are resolved with this release:
4700 438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
4701 14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
4702 16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
4703 16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
4704 17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
4705 17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
4706 17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
4707 17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
4708 18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
4709 18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
4710 18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
4711 18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
4712 18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
4713 18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
4714 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
4715 18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
4716 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
4717 18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
4718 18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
4719 18657, 18676, 18694, 18696, 18887.
4721 * Cache information can be queried via sysconf() function on s390 e.g. with
4722 _SC_LEVEL1_ICACHE_SIZE as argument.
4724 * A buffer overflow in gethostbyname_r and related functions performing DNS
4725 requests has been fixed. If the NSS functions were called with a
4726 misaligned buffer, the buffer length change due to pointer alignment was
4727 not taken into account. This could result in application crashes or,
4728 potentially arbitrary code execution, using crafted, but syntactically
4729 valid DNS responses. (CVE-2015-1781)
4731 * The time zone file parser has been made more robust against crafted time
4732 zone files, avoiding heap buffer overflows related to the processing of
4733 the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
4734 large time zone data files. Overly long time zone specifiers in the TZ
4735 variable no longer result in stack overflows and crashes.
4737 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
4738 for LD and GD on x86 and x86-64, has been implemented. You will need
4739 binutils-2.24 or later to enable this optimization.
4741 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
4742 new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
4743 Hat). These updates cause user visible changes, such as the fix for bug
4746 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
4747 and getXXbyYY NSS calls for the same database, causing a denial-of-service
4748 condition in some applications.
4750 * Added vector math library named libmvec with the following vectorized x86_64
4751 implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
4753 The library can be disabled with --disable-mathvec. Use of the functions is
4754 enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
4755 Shared library libmvec.so is linked in as needed when using -lm (no need to
4756 specify -lmvec explicitly for not static builds).
4757 Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
4759 * A new fmemopen implementation has been added with the goal of POSIX
4760 compliance. The new implementation fixes the following long-standing
4761 issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
4762 old implementation is still present for use be by existing binaries.
4764 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
4765 releases. It has been fixed to match 2.19 and older, but binaries built
4766 against 2.20 and 2.21 might need to be recompiled. See BZ#18694.
4768 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
4769 Contributed by Roland McGrath (Google).
4771 * The header <regexp.h> is deprecated, and will be removed in a future
4772 release. Use of this header will trigger a deprecation warning.
4773 Application developers should update their code to use <regex.h> instead.
4775 This header was formerly part of SUS, but was deprecated in 1994 and
4776 removed from the standard in 2001. Also, the glibc implementation
4777 leaks memory. See BZ#18681 for more details.
4781 * The following bugs are resolved with this release:
4783 6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
4784 15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
4785 16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
4786 17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
4787 17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
4788 17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
4789 17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
4790 17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
4791 17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
4792 17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
4795 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
4796 too little memory for the to-be-scanned arguments and overflow the
4797 allocated buffer. The implementation now correctly computes the required
4798 buffer size when using malloc, and switches to malloc from alloca as
4801 * A new semaphore algorithm has been implemented in generic C code for all
4802 machines. Previous custom assembly implementations of semaphore were
4803 difficult to reason about or ensure that they were safe. The new version
4804 of semaphore supports machines with 64-bit or 32-bit atomic operations.
4805 The new semaphore algorithm is used by sem_init, sem_open, sem_post,
4806 sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
4808 * Port to Altera Nios II has been contributed by Mentor Graphics.
4810 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
4811 implementations for powerpc64/powerpc64le.
4812 Implemented by Adhemerval Zanella (IBM).
4814 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
4815 and powerpc64le. This may improve lock scaling of existing programs on
4816 HTM capable systems. The lock elision code is only enabled with
4817 --enable-lock-elision=yes. Also, the TSX lock elision implementation for
4818 powerpc will issue a transaction abort on every syscall to avoid side
4819 effects being visible outside transactions.
4821 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
4822 AArch64. Contributed by ARM Ltd.
4824 * i386 memcpy functions optimized with SSE2 unaligned load/store.
4826 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
4827 under certain input conditions resulting in the execution of a shell for
4828 command substitution when the application did not request it. The
4829 implementation now checks WRDE_NOCMD immediately before executing the
4830 shell and returns the error WRDE_CMDSUB as expected.
4832 * CVE-2012-3406 printf-style functions could run into a stack overflow when
4833 processing format strings with a large number of format specifiers.
4835 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
4836 infinite loop if the DNS response contained a PTR record of an unexpected
4839 * The minimum GCC version that can be used to build this version of the GNU
4840 C Library is GCC 4.6. Older GCC versions, and non-GNU compilers, can
4841 still be used to compile programs using the GNU C Library.
4843 * The GNU C Library is now built with -Werror by default. This can be
4844 disabled by configuring with --disable-werror.
4846 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
4848 * The obsolete sigvec function has been removed. This was the original
4849 4.2BSD interface that inspired the POSIX.1 sigaction interface, which
4850 programs have been using instead for about 25 years. Of course, ABI
4851 compatibility for old binaries using sigvec remains intact.
4853 * Merged gettext 0.19.3 into the intl subdirectory. This fixes building
4854 with newer versions of bison.
4856 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
4857 The original MIPS o32 hard-float ABI requires an FPU where double-precision
4858 registers overlay two consecutive single-precision registers. MIPS32R2
4859 introduced a new FPU mode (FR=1) where double-precision registers extend the
4860 corresponding single-precision registers which is incompatible with the
4861 o32 hard-float ABI. The MIPS SIMD ASE and the MIPSR6 architecture both
4862 require the use of FR=1 making a transition necessary. New o32 ABI
4863 extensions enable users to migrate over time from the original o32 ABI
4864 through to the updated o32 FP64 ABI. To achieve this the dynamic linker now
4865 tracks the ABI of any loaded object and verifies that new objects are
4866 compatible. Mode transitions will also be requested as required and
4867 unsupportable objects will be rejected. The ABI checks include both soft and
4868 hard float ABIs for o32, n32 and n64.
4870 GCC 5 with GNU binutils 2.25 onwards:
4871 It is strongly recommended that all o32 system libraries are built using the
4872 new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
4873 with the original and all new o32 ABI extensions. Configure a MIPS GCC
4874 compiler using --with-fp-32=xx to set this by default.
4878 * The following bugs are resolved with this release:
4880 6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
4881 15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
4882 16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
4883 16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
4884 16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
4885 16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
4886 16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
4887 16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
4888 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
4889 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
4890 16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
4891 16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
4892 17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
4893 17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
4894 17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
4896 * Reverted change of ABI data structures for s390 and s390x:
4897 On s390 and s390x the size of struct ucontext and jmp_buf was increased in
4898 2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
4899 of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
4900 are preserved pointing straight to the same implementation as the old ones.
4901 Given that, new callers will simply provide a too-big buffer to these
4902 functions. Any applications/libraries out there that embed jmp_buf or
4903 ucontext_t in an ABI-relevant data structure that have already been rebuilt
4904 against 2.19 headers will have to rebuilt again. This is necessary in any
4905 case to revert the breakage in their ABI caused by the glibc change.
4907 * Support for file description locks is added to systems running the
4908 Linux kernel. The standard file locking interfaces are extended to
4909 operate on file descriptions, not file descriptors, via the use of
4910 F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
4911 are associated with an open file instead of a process.
4913 * Optimized strchr implementation for AArch64. Contributed by ARM Ltd.
4915 * The minimum Linux kernel version that this version of the GNU C Library
4916 can be used with is 2.6.32.
4918 * Running the testsuite no longer terminates as soon as a test fails.
4919 Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
4920 with PASS or FAIL lines for individual tests. A summary of the results is
4921 printed, including a list of failing lists, and "make check" exits with
4922 error status if there were any unexpected failures. "make check
4923 stop-on-test-failure=y" may be used to keep the old behavior.
4925 * The am33 port, which had not worked for several years, has been removed
4928 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
4929 supported; they now act the same as _DEFAULT_SOURCE (but generate a
4930 warning). Except for cases where _BSD_SOURCE enabled BSD interfaces that
4931 conflicted with POSIX (support for which was removed in 2.19), the
4932 interfaces those macros enabled remain available when compiling with
4933 _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
4934 test macros defined.
4936 * Optimized strcmp implementation for ARMv7. Contributed by ARM Ltd.
4938 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
4939 This may improve lock scaling of existing programs on TX capable systems.
4940 The lock elision code is only built with --enable-lock-elision=yes and
4941 then requires a GCC version supporting the TX builtins. With lock elision
4942 default mutexes are elided via __builtin_tbegin, if the cpu supports
4943 transactions. By default lock elision is not enabled and the elision code
4946 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
4947 copy the path argument. This allowed programs to cause posix_spawn to
4948 deference a dangling pointer, or use an unexpected pathname argument if
4949 the string was modified after the posix_spawn_file_actions_addopen
4952 * All supported architectures now use the main glibc sysdeps directory
4953 instead of some being in a separate "ports" directory (which was
4954 distributed separately before glibc 2.17).
4956 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
4957 On configurations that support it (all Linux configurations), it's now
4958 used regardless of the --enable-add-ons switch to configure. It is no
4959 longer possible to build such configurations without pthreads support.
4961 * Locale names, including those obtained from environment variables (LANG
4962 and the LC_* variables), are more tightly checked for proper syntax.
4963 setlocale will now fail (with EINVAL) for locale names that are overly
4964 long, contain slashes without starting with a slash, or contain ".." path
4965 components. (CVE-2014-0475) Previously, some valid locale names were
4966 silently replaced with the "C" locale when running in AT_SECURE mode
4967 (e.g., in a SUID program). This is no longer necessary because of the
4970 * On x86-64, the dynamic linker's lazy-binding support is now compatible
4971 with application code using Intel MPX instructions. (With all previous
4972 versions, the MPX register state could be clobbered when making calls
4973 into or out of a shared library.) Note that while the new dynamic
4974 linker is compatible with all known x86 hardware whether or not it
4975 supports Intel MPX, some x86 instruction-set emulators might fail to
4976 handle the new instruction encodings. This is known to affect Valgrind
4977 versions up through 3.9 (but will be fixed in the forthcoming 3.10
4978 release), and might affect other tools that do instruction emulation.
4980 * Support for loadable gconv transliteration modules has been removed.
4981 The support for transliteration modules has been non-functional for
4982 over a decade, and the removal is prompted by security defects. The
4983 normal gconv conversion modules are still supported. Transliteration
4984 with //TRANSLIT is still possible, and the //IGNORE specifier
4985 continues to be supported. (CVE-2014-5119)
4987 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
4988 IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
4989 resulting a denial-of-service security vulnerability in applications which
4990 use functions related to iconv. (CVE-2014-6040)
4994 * The following bugs are resolved with this release:
4996 156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
4997 7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
4998 12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
4999 14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
5000 15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
5001 15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
5002 15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
5003 15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
5004 15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
5005 15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
5006 15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
5007 15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
5008 16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
5009 16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
5010 16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
5011 16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
5012 16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
5013 16431, 16453, 16474, 16506, 16510, 16529
5015 * Slovenian translations for glibc messages have been contributed by the
5016 Translation Project's Slovenian team of translators.
5018 * The public headers no longer use __unused nor __block. This change is to
5019 support compiling programs that are derived from BSD sources and use
5020 __unused internally, and to support compiling with Clang's -fblock
5021 extension which uses __block.
5023 * CVE-2012-4412 The strcoll implementation caches indices and rules for
5024 large collation sequences to optimize multiple passes. This cache
5025 computation may overflow for large collation sequences and may cause a
5026 stack or buffer overflow. This is now fixed to use a slower algorithm
5027 which does not use a cache if there is an integer overflow.
5029 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
5030 rules for large collation sequences to optimize multiple passes and falls
5031 back to alloca if malloc fails, resulting in a possible stack overflow.
5032 The implementation now falls back to an uncached collation sequence lookup
5035 * CVE-2013-4788 The pointer guard used for pointer mangling was not
5036 initialized for static applications resulting in the security feature
5037 being disabled. The pointer guard is now correctly initialized to a
5038 random value for static applications. Existing static applications need
5039 to be recompiled to take advantage of the fix (bug 15754).
5041 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
5042 to the d_name member of struct dirent, or omit the terminating NUL
5043 character. (Bugzilla #14699).
5045 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
5046 aligned_alloc functions could allocate too few bytes or corrupt the
5047 heap when passed very large allocation size values (Bugzilla #15855,
5050 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
5051 for AF_INET6 has been fixed (Bugzilla #16072).
5053 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
5054 pap_CW, quz_PE, the_NP.
5056 * Substantially revised locales: gd_GB, ht_HT
5058 * The LC_ADDRESS field was updated to support country_car for almost all
5061 * ISO 1427 definitions were updated.
5063 * ISO 3166 definitions were updated.
5065 * The localedef utility now supports --big-endian and --little-endian
5066 command-line options to generate locales for a different system from that
5067 for which the C library was built.
5069 * Binary locale files now only depend on the endianness of the system for
5070 which they are generated and not on other properties of that system. As a
5071 consequence, binary files generated with new localedef may be incompatible
5072 with old versions of the GNU C Library, and binary files generated with
5073 old localedef may be incompatible with this version of the GNU C Library,
5074 in the following circumstances:
5076 + Locale files may be incompatible on m68k systems.
5078 + Locale archive files (but not separate files for individual locales) may
5079 be incompatible on systems where plain "char" is signed.
5081 * The configure option --disable-versioning has been removed. Builds with
5082 --disable-versioning had not worked for several years.
5084 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
5085 cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
5087 * SystemTap probes for malloc have been introduced.
5089 * SystemTap probes for slow multiple precision fallback paths of
5090 transcendental functions have been introduced.
5092 * Support for powerpc64le has been added.
5094 * The soft-float powerpc port now supports e500 processors.
5096 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
5098 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
5099 set of header declarations that are enabled by default, even when other
5100 feature test macros or compiler options such as -std=c99 would otherwise
5101 disable some of those declarations.
5103 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
5104 conflict with POSIX. The libbsd-compat library (which was a dummy library
5105 that did nothing) has also been removed.
5107 * Preliminary documentation about Multi-Thread, Async-Signal and
5108 Async-Cancel Safety has been added.
5110 * Change of ABI data structures for s390 and s390x:
5111 On s390 and s390x the size of struct ucontext and jmp_buf was increased to
5112 allow for future hardware extensions. All library functions that accept or
5113 return these structures were versioned in order to provide backwards
5114 compatibility with existing code. However, not all cases can be handled
5115 with interface versioning. If an application embeds either structure into
5116 another structure and that structure is passed to another compilation unit
5117 which expects the newer larger-sized object then any access to the new
5118 fields will result in undefined behaviour. Similarly any access to fields
5119 that were moved by the enlarging of the structures will cause undefined
5120 behaviour. To fix the undefined behaviour all objects that are part of the
5121 final in-memory image must agree on the size of structures, and this may
5122 require recompilation.
5126 * The following bugs are resolved with this release:
5128 2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
5129 11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
5130 14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
5131 14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
5132 14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
5133 15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
5134 15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
5135 15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
5136 15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
5137 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
5138 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
5139 15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
5140 15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
5143 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
5144 has been fixed by disabling the use of pt_chown (Bugzilla #15755).
5145 Distributions can re-enable building and using pt_chown via the new configure
5146 option `--enable-pt_chown'. Enabling the use of pt_chown carries with it
5147 considerable security risks and should only be used if the distribution
5148 understands and accepts the risks.
5150 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
5153 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
5154 fixed (Bugzilla #15330).
5156 * Add support for calling C++11 thread_local object destructors on thread
5157 and program exit. This needs compiler support for offloading C++11
5158 destructor calls to glibc.
5160 * Improved worst case performance of libm functions with double inputs and
5163 * Support for priority inherited mutexes in pthread condition variables on
5164 non-x86 architectures.
5166 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
5168 * Optimized string functions for AArch64. Implemented by Marcus Shawcroft.
5170 * Optimized string functions for ARM. Implemented by Will Newton and
5173 * Optimized libm functions for SPARC. Implemented by David S. Miller.
5175 * Support for building more of ARM glibc as Thumb-2 code. Implemented by
5178 * Support for building most of MIPS glibc as MIPS16 code. Implemented by
5179 Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
5181 * Added a benchmark framework to track performance of functions in glibc.
5183 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
5184 It is based on draft TS 18661 and currently enabled as a GNU extension.
5186 * On Linux, the clock function now uses the clock_gettime system call
5187 for improved precision, rather than old times system call.
5189 * Added support for version-3 tz format files. This is needed when using
5190 the tz database release 2013e or later, and affects a few unusual cases --
5191 currently only TZ='America/Godthab' for time stamps after 2037.
5193 * Added new API functions pthread_getattr_default_np and
5194 pthread_setattr_default_np to get and set the default pthread
5195 attributes of a process.
5197 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
5198 This may improve lock scaling of existing programs on TSX capable systems.
5199 When the --enable-lock-elision=yes parameter is specified at configure
5200 time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
5203 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
5204 availability). Implemented by Ryan S. Arnold.
5206 * Support added for POWER8 platform. Implemented by Ryan S. Arnold.
5210 * The following bugs are resolved with this release:
5212 1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
5213 9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
5214 11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
5215 13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
5216 13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
5217 14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
5218 14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
5219 14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
5220 14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
5221 14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
5222 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
5223 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
5224 14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
5225 14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
5226 14879, 14889, 14893, 14898, 14914.
5228 * Optimization of memcpy for MIPS.
5230 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
5231 EMFILE has been fixed (Bugzilla #14889).
5233 * The add-on ports collection is now distributed in the "ports" subdirectory
5234 of the main GNU C Library distribution, rather than separately.
5236 * Port to ARM AArch64 contributed by Linaro.
5238 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
5239 Optimized versions of memcpy, memset, and memcmp added for System z10 and
5241 Implemented by Andreas Krebbel.
5243 * The new function secure_getenv allows secure access to the environment,
5244 returning NULL if running in a SUID/SGID process. This function replaces
5245 the internal function __secure_getenv.
5247 * SystemTap static probes have been added into the dynamic linker.
5248 Implemented by Gary Benson.
5250 * Optimizations of string functions strstr, strcasestr and memmem.
5251 Implemented by Maxim Kuvyrkov.
5253 * The minimum Linux kernel version that this version of the GNU C Library
5254 can be used with is 2.6.16.
5256 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
5257 powerpc POWER7. Implemented by Will Schmidt.
5259 * New configure option --disable-nscd builds the C library such that it
5260 never attempts to contact the Name Service Caching Daemon (nscd).
5261 New configure option --disable-build-nscd avoids building nscd itself;
5262 this is the default if --disable-nscd is used.
5264 * Improved support for cross-compilation, including cross-testing and
5265 bootstrap builds without a previously built glibc.
5267 * Several testsuite tests are now able to test multiple IFUNC variants of an
5268 interface, rather than just testing the one that would be chooen by
5271 * New configure options --with-bugurl and --with-pkgversion, for
5272 distributors to use to embed their bug-reporting and package version
5273 information in --help and --version output.
5275 * The ttyname and ttyname_r functions on Linux now fall back to searching for
5276 the tty file descriptor in /dev/pts or /dev if /proc is not available. This
5277 allows creation of chroots without the procfs mounted on /proc.
5279 * The `crypt' function now fails if passed salt bytes that violate the
5280 specification for those values. On Linux, the `crypt' function will
5281 consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
5282 enabled, and fail on encrypted strings using the MD5 or DES algorithm
5283 when the mode is enabled.
5285 * The `clock_*' suite of functions (declared in <time.h>) is now available
5286 directly in the main C library. Previously it was necessary to link with
5287 -lrt to use these functions. This change has the effect that a
5288 single-threaded program that uses a function such as `clock_gettime' (and
5289 is not linked with -lrt) will no longer implicitly load the pthreads
5290 library at runtime and so will not suffer the overheads associated with
5291 multi-thread support in other code such as the C++ runtime library.
5293 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
5298 * The following bugs are resolved with this release:
5300 174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
5301 2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
5302 3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
5303 5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
5304 6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
5305 10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
5306 11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
5307 12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
5308 13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
5309 13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
5310 13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
5311 13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
5312 13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
5313 13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
5314 13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
5315 13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
5316 13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
5317 13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
5318 13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
5319 14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
5320 14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
5321 14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
5324 * Support for the x32 ABI on x86-64 added. The x32 target is selected by
5325 configuring glibc with:
5326 BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
5327 Visit <https://sites.google.com/site/x32abi/> for more x32 ABI info.
5328 Implemented by H.J. Lu.
5332 + define static_assert
5334 + do not declare gets
5336 + declare at_quick_exit and quick_exit also for ISO C11
5338 + aligned_alloc. NB: The code is deliberately allows the size parameter
5339 to not be a multiple of the alignment. This is a moronic requirement
5340 in the standard but it is only a requirement on the caller, not the
5343 + timespec_get added
5345 + uchar.h support added
5347 + CMPLX, CMPLXF, CMPLXL added
5349 Implemented by Ulrich Drepper.
5351 * Support for the IA-64 has been moved to ports.
5353 * Remove support for anything but ELF binary format
5355 * Checking versions of poll, ppoll added.
5356 Implemented by Ulrich Drepper.
5358 * More generic and 64-bit performance optimizations to math functions.
5359 Implemented by Ulrich Drepper.
5361 * New configure option --enable-obsolete-rpc makes the deprecated RPC
5362 headers and functions available at compile time as they were before
5363 version 2.14. This option will be removed at some time in the future
5364 after the TI-RPC library becomes fully sufficient for the needs of
5365 existing applications.
5367 * Compatibility code for Linux kernel versions before 2.4 has been removed.
5368 Note that glibc is not expected to work with any Linux kernel version
5371 * New header <sys/auxv.h> and function getauxval allowing easy access to
5372 the AT_* key-value pairs passed from the Linux kernel. The header also
5373 defines the HWCAP_* bits associated with the AT_HWCAP key.
5375 * New locales: mag_IN
5377 * New configure option --enable-systemtap builds SystemTap static probes
5378 into libc for setjmp and longjmp and into libpthread for various operations.
5379 So far the setjmp/longjmp probes and some of the libpthread probes are
5380 provided only for i*86 and x86_64.
5381 Implemented by Roland McGrath and Rayson Ho.
5383 * Optimized expf for x86-32 and x86-64. Implemented by Liubov Dmitrieva.
5385 * More optimized functions for PowerPC. Implemented by Adhemerval Zanella
5388 * More optimized functions for SPARC. Implemented by David S. Miller.
5390 * Improved support for cross-compilation, especially bootstrap builds
5391 without a previously built glibc.
5393 * Ports for the TILE-Gx and TILEPro families of processors. Contributed by
5394 Chris Metcalf from Tilera.
5396 * Support for the old ARM ABI has been removed from ports. Only the EABI is
5397 now supported for ARM processors.
5399 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
5400 as the name of the dynamic linker, to distinguish it from the
5401 /lib/ld-linux.so.3 dynamic linker used for the base EABI.
5403 * Support for CRIS has been removed from ports.
5405 * A new class of installed header has been documented for low-level
5406 platform-specific functionality. PowerPC added the first instance with a
5407 function to provide time base register access. Contributed by Tulio
5408 Magno Quites Machado Filho.
5410 * ix86 configurations now install header files that are consistent with
5411 what x86-64 configurations install. These same header files can be used
5412 for -m32, -m64, or -mx32 builds.
5413 Contributed by H.J. Lu.
5415 * Math library bug fixes. A thorough audit of all open math library bugs was
5416 conducted by Joseph Myers. Significant progress was made on many math
5417 library bugs resulting in more accurate exceptions and function results.
5418 Many thanks to all those that contributed including Andreas Jaeger for his
5419 patch review and work on the x87 trigonometric instruction issues.
5421 * Timezone data is no longer installed. Timezone-related binaries and scripts
5422 will continue to be installed. Users should obtain their timezone data from
5423 their distribution provider or from the tzdata package at
5424 <ftp://munnari.oz.au/pub/>.
5428 * The following bugs are resolved with this release:
5430 6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
5431 12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
5432 13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
5433 13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
5434 13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
5435 13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
5436 13484, 13506, 13515, 13523, 13524, 13538, 13540
5438 * New program pldd to list loaded object of a process
5439 Implemented by Ulrich Drepper.
5441 * Add nss_db support back to glibc. No more dependency on Berkeley db
5442 and support for initgroups lookups.
5443 Implemented by Ulrich Drepper.
5445 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
5446 Contributed by HJ Lu.
5448 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
5449 Contributed by HJ Lu.
5451 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
5452 on x86-32 and x86-64.
5453 Contributed by Liubov Dmitrieva.
5455 * Optimized strchr and strrchr for SSE on x86-32.
5456 Contributed by Liubov Dmitrieva.
5458 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
5459 for x86-64 and x86-32.
5460 Contributed by Liubov Dmitrieva.
5462 * New interfaces: scandirat, scandirat64
5463 Implemented by Ulrich Drepper.
5465 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
5466 Implemented by Ulrich Drepper.
5468 * nscd now also caches the netgroup database.
5469 Implemented by Ulrich Drepper.
5471 * Integrate libm with gcc's -ffinite-math-only option.
5472 Implemented by Ulrich Drepper.
5474 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
5475 to math functions. Implemented by Ulrich Drepper.
5477 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
5478 Implemented by Ulrich Drepper.
5480 * New Linux interfaces: process_vm_readv, process_vm_writev
5482 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
5483 Implemented by Ulrich Drepper.
5485 * Optimized nearbyint and strcasecmp for PPC.
5486 Implemented by Adhemerval Zanella.
5488 * New locales: bho_IN, unm_US, es_CU, ta_LK
5492 * The following bugs are resolved with this release:
5494 386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
5495 11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
5496 11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
5497 11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
5498 12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
5499 12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
5500 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
5501 12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
5502 12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
5503 12795, 12811, 12813, 12814, 12841
5505 * The RPC implementation in libc is obsoleted. Old programs keep working
5506 but new programs cannot be linked with the routines in libc anymore.
5507 Programs in need of RPC functionality must be linked against TI-RPC.
5508 The TI-RPC implementation is IPv6 enabled and there are other benefits.
5510 Visible changes of this change include (obviously) the inability to link
5511 programs using RPC functions without referencing the TI-RPC library and the
5512 removal of the RPC headers from the glibc headers.
5513 Implemented by Ulrich Drepper.
5515 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
5516 syncfs, setns, sendmmsg
5518 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
5519 yue_HK, lij_IT, mhr_RU
5521 * New encodings: CP770, CP771, CP772, CP773, CP774
5523 * New program sotruss to trace calls through PLTs
5524 Implemented by Ulrich Drepper.
5526 * The malloc hook implementation is marked deprecated and will be removed
5527 from the default implementation in the next version. The design never
5528 worked ever since the introduction of threads. Even programs which do
5529 not create threads themselves can use multiple threads created internally.
5533 * The following bugs are resolved with this release:
5535 3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
5536 11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
5537 12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
5538 12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
5541 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
5543 * POWER7 optimizations: memset, memcmp, strncmp
5545 * New optimized string functions for x86-64: strnlen (SSE2),
5546 strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
5547 Implemented by Ulrich Drepper.
5551 * The following bugs are resolved with this release:
5553 3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
5554 10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
5555 11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
5556 11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
5557 11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
5558 11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
5559 11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
5560 11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
5562 * New interfaces: pthread_getname_np, pthread_setname_np
5564 * New Linux interface: recvmmsg
5566 * STT_GNU_IFUNC implemented for Sparc by David Miller.
5568 * The dynamic linker now recognizes supported ABI versions from the
5569 EI_ABIVERSION field in the ELF header.
5570 Implemented by Ulrich Drepper.
5572 * New NIS mode selector ADJUNCT_AS_SHADOW. The passwd.adjunct.byname table
5573 will not be used to fill in password fields in the passwd.byname replies.
5574 Instead it is used to synthesize the shadow.byname table, should it be
5575 missing. This is a useful mode in some installations involving Solaris.
5576 Implemented by Ulrich Drepper.
5578 * New locales: kok_IN, sq_MK, cv_RU
5582 * The following bugs are resolved with this release:
5584 3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
5585 10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
5586 10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
5587 10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
5588 10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
5589 10789, 10817, 10823, 10840, 10847
5591 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
5593 Implemented by Ulrich Drepper.
5595 * Checking version of longjmp added that fails if an uninitialized stack
5596 frame would be created. Implemented by Ulrich Drepper.
5598 * STT_GNU_IFUNC is now supported in static executables.
5599 Implemented by H.J. Lu.
5601 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
5603 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
5604 strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
5605 strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
5606 Contributed by H.J. Lu.
5608 strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
5609 Implemented by Ulrich Drepper.
5611 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
5613 Contributed by H.J. Lu.
5615 * Support for fma instruction in AVX on x86-64.
5616 Implemented by H.J. Lu and Ulrich Drepper.
5618 * AVX support in x86-64 auditing support in ld.so.
5619 Implemented by H.J. Lu.
5621 * STB_GNU_UNIQUE support added.
5622 Implemented by Ulrich Drepper.
5624 * Implement second fallback mode for optimized DNS lookup for even more
5625 broken environments. If two requests from the same port are not
5626 handled correctly close the socket and open a new one before sending
5627 the second request. The 'single-request-reopen' option in /etc/resolv.conf
5628 can be used to select this mode right away, instead of rediscovering the
5629 necessity is every process again.
5630 Implemented by Ulrich Drepper.
5632 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
5633 Implemented by Adam Tkac.
5635 * Optimized iconv conversions for S390x.
5636 Implemented by Andreas Krebbel.
5638 * Using condvars with PI mutexes is now more efficient due to kernel
5639 support for requeueing to PI futexes. NPTL support added for x86-64.
5640 Implemented by Ulrich Drepper.
5642 * New locales: ps_AF, my_MM
5646 * The following bugs are resolved with this release:
5648 697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
5649 9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
5650 9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
5651 9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
5652 10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
5654 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
5655 Implemented by Ulrich Drepper.
5657 * New Linux interfaces: accept4, fallocate, fallocate64.
5658 Implemented by Ulrich Drepper.
5660 * Correct declarations of string function when used in C++ code. This
5661 could lead to compile errors for invalid C++ code.
5663 * XPG7/POSIX 2008 compilation environment. Many GNU-specific functions are
5666 * New POSIX 2008 interface: psiginfo
5667 Implemented by Ulrich Drepper.
5669 * New ISO C++1x interfaces: quick_exit, at_quick_exit
5670 Implemented by Ulrich Drepper.
5672 * Support for selecting between multiple function definitions at runtime
5673 using STT_GNU_IFUNC symbols. Implemented by Ulrich Drepper.
5675 * The libcrypt library can now use the hash function implementations in
5676 NSS. Implemented by Ulrich Drepper.
5678 * The malloc implementation can be compiled to be less memory efficient
5679 but higher performing in multi-threaded programs.
5680 Implemented by Ulrich Drepper.
5682 * New locales: nan_TW@latin, ks_IN
5684 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
5685 Implemented by Ulrich Drepper.
5687 * Extended printf hook support. It is possible to use user-defined types
5688 and extend existing format specifiers.
5689 Implemented by Ulrich Drepper.
5691 * Handling for group shadow files has been added.
5692 Implemented by Ulrich Drepper.
5694 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
5695 servers (the case, e.g., for some people using the built-in DNS
5696 server in ADSL modems/routers). There is a once-per-process timeout
5697 in case of a broken server. To avoid it, users can run nscd or put
5698 'options single-request' in /etc/resolv.conf.
5699 Implemented by Ulrich Drepper.
5703 * The following bugs are resolved with this release:
5705 2447, 3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447,
5706 6461, 6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712,
5707 6713, 6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839,
5708 6843, 6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955,
5709 6966, 6968, 6974, 6980, 6995, 7008, 7009, 7029
5711 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
5712 up at the same time. Implemented by Ulrich Drepper.
5714 * TLS descriptors for LD and GD on x86 and x86-64.
5715 Implemented by Alexandre Oliva.
5717 * getaddrinfo now handles DCCP and UDPlite.
5718 Implemented by Ulrich Drepper.
5720 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
5721 htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
5722 Implemented by Ulrich Drepper.
5724 * New implementation of memmem, strstr, and strcasestr which is O(n).
5725 Implemented by Eric Blake.
5727 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
5729 * Implement "e" option for popen to open file descriptor with the
5730 close-on-exec flag set. Implemented by Ulrich Drepper.
5732 * Implement "b" mode for fmemopen. In this mode writes writes don't
5733 implicitly add a NUL byte and seeks from the end of the buffer really
5734 use the buffer end, not the string length as the basis.
5735 Implemented by Ulrich Drepper.
5737 * Many functions, exported and internal, now atomically set the close-on-exec
5738 flag when run on a sufficiently new kernel. Implemented by Ulrich Drepper.
5740 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
5742 Implemented by Pravin Satpute.
5744 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
5748 * The following bugs are resolved with this release:
5750 2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
5751 5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
5752 5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
5753 5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
5754 5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
5755 5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
5756 5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
5758 * New locales: bo_CN, bo_IN, shs_CA.
5760 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
5762 * Sorting rules for some Indian languages (Devanagari and Gujarati).
5763 Implemented by Pravin Satpute.
5765 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
5767 * nscd caches now all timeouts for DNS entries
5768 Implemented by Ulrich Drepper.
5770 * nscd is more efficient and wakes up less often.
5771 Implemented by Ulrich Drepper.
5773 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
5774 vdprintf, and obstack_vprintf.
5775 Implemented by Jakub Jelinek.
5777 * Faster memset for x86-64.
5778 Implemented by Harsha Jagasia and H.J. Lu.
5780 * Faster memcpy on x86.
5781 Implemented by Ulrich Drepper.
5783 * ARG_MAX is not anymore constant on Linux. Use sysconf(_SC_ARG_MAX).
5784 Implemented by Ulrich Drepper.
5786 * Faster sqrt and sqrtf implemention for some PPC variants.
5787 Implemented by Steven Munroe.
5791 * The following bugs are resolved with this release:
5793 4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
5794 4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
5795 4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
5796 4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
5797 5071, 5103, 5104, 5112, 5113, 5184, 5186
5799 * More checking functions: fread, fread_unlocked, open*, mq_open.
5800 Implemented by Jakub Jelinek and Ulrich Drepper.
5802 * Extend fortification to C++. Implemented by Jakub Jelinek.
5804 * Implement 'm' modifier for scanf. Add stricter C99/SUS compliance
5805 by not recognizing 'a' as a modifier when those specs are requested.
5806 Implemented by Jakub Jelinek.
5808 * PPC optimizations to math and string functions.
5809 Implemented by Steven Munroe.
5811 * New interfaces: mkostemp, mkostemp64. Like mkstemp* but allow additional
5812 options to be passed. Implemented by Ulrich Drepper.
5814 * More CPU set manipulation functions. Implemented by Ulrich Drepper.
5816 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
5817 Implemented by Ulrich Drepper.
5819 * Handle private futexes in the NPTL implementation.
5820 Implemented by Jakub Jelinek and Ulrich Drepper.
5822 * Add support for O_CLOEXEC. Implement in Hurd. Use throughout libc.
5823 Implemented by Roland McGrath and Ulrich Drepper.
5825 * Linux/x86-64 vDSO support. Implemented by Ulrich Drepper.
5827 * SHA-256 and SHA-512 based password encryption.
5828 Implemented by Ulrich Drepper.
5830 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
5831 ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
5834 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
5835 Implemented by Ulrich Drepper.
5839 * The following bugs are resolved with this release:
5841 3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
5842 3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
5843 3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
5844 3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
5845 3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
5846 4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
5847 4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
5850 * New Linux interfaces: epoll_pwait, sched_getcpu.
5852 * New generic interfaces: strerror_l.
5854 * nscd can now cache the services database. Implemented by Ulrich Drepper.
5858 * The following bugs are resolved with this release:
5860 39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
5861 1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
5862 2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
5863 2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
5864 2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
5865 2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
5866 2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
5867 3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
5868 3225, 3251, 3252, 3253, 3273
5870 * For Linux, the sorting of addresses returned by getaddrinfo now also
5871 handles rules 3, 4, and 7 from RFC 3484. I.e., all rules are handled.
5872 Implemented by Ulrich Drepper.
5874 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
5875 Implemented by Ulrich Drepper.
5877 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
5879 * New iconv module for MIK. Contributed by Alexander Shopov.
5881 * For sites with broken group and/or passwd database, the auto-propagate
5882 option of nscd can prevent creating ID lookup entries from the results
5883 of a name lookup and vice versa. This usually is no problem but some
5884 site might have problems with the default behavior.
5885 Implemented by Ulrich Drepper.
5887 * Iterating over entire database in NIS can be slow. With the
5888 SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
5889 to trade time for memory. The entire database will be read at once.
5890 Implemented by Ulrich Drepper.
5892 * The interfaces introduced in RFC 3542 have been implemented by
5895 * Support for the new ELF hash table format was added by Ulrich Drepper.
5897 * Support for priority inheritance mutexes added by Jakub Jelinek and
5900 * Support for priority protected mutexes added by Jakub Jelinek.
5902 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
5903 or_IN, csb_PL, fy_NL, sr_ME.
5907 * More overflow detection functions.
5909 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
5910 IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
5912 More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
5913 IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
5914 IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
5915 IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
5916 IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
5917 by Masahide Washizawa.
5919 * It is now possible to install audit libraries for the dynamic linker using
5920 LD_AUDIT. Implemented by Ulrich Drepper.
5922 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
5923 longer supported. The new NPTL implementation requires Linux 2.6 kernels.
5924 For a libc and libpthread that works well on Linux 2.4 kernels, we
5925 recommend using the stable 2.3 branch.
5927 * The new function open_wmemstream acts like open_memstream,
5928 but uses a wchar_t wide character buffer.
5930 * The new function ppoll is an improved version of poll, similar to pselect.
5932 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
5933 futimesat, faccessat, mkdirat, mkfifoat, mknodat,
5934 renameat, unlinkat, linkat, symlinkat, readlinkat.
5936 * New Linux kernel system calls: unshare,
5937 inotify_init, inotify_add_watch, inotify_rm_watch.
5939 * The euidaccess function is now also known by the alias eaccess,
5940 for compatibility with some other systems.
5942 * Timezone data updated to 2006b version.
5946 * The following bugs are resolved with this release:
5948 38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
5949 1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
5950 1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
5951 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
5952 1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
5953 1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
5955 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5957 * As of this release, GCC 4 can be used to compile the C Library.
5959 * Timezone data updated to 2005m version.
5963 * The following bugs are resolved with this release:
5965 284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
5966 722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
5967 737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
5968 777, 787, 821, 822, 823, 825
5970 Visit <https://sourceware.org/bugzilla/> for the details of each bug.
5974 * Support for RFC 3678. Real implementations exist only for Linux so far.
5975 Implemented by Ulrich Drepper.
5977 * nscd can now cache entries persistently. Expiring entries are reloaded.
5978 For speedups the cache can be shared in memory with client processes.
5979 Implemented by Ulrich Drepper.
5981 * nscd can now perform SELinux checks.
5982 Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
5984 * getaddrinfo queries are now cached. Canonical name lookup is performed
5986 Implemented by Ulrich Drepper.
5988 * The nothrow function attribute is used when headers are used by gcc when
5989 compiling C code. This can avoid significant amounts of exception
5992 * The malloc functions perform more error checking and are stricter when
5993 it comes to reacting on errors. The default action is to terminate
5994 the process after showing an error message. Implemented by Ulrich Drepper.
5996 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
5997 lookups anymore unless explicitly requested. Implemented by Ulrich Drepper.
5999 * Namespaces in ld.so are implemented. DSOs can be loaded in separate
6000 namespaces using the new function dlmopen(). This feature is of course,
6001 like most other dynamic loading functionality, not available in statically
6002 linked applications. Implemented by Ulrich Drepper.
6004 * Low-overhead boundary checking variants of string and some stdio functions
6005 were added. These are to be used in conjunction with a gcc patch by
6006 Jakub Jelinek which adds calls to these functions if possible.
6007 Implemented by Jakub Jelinek and Ulrich Drepper.
6009 * Old code for several operating systems and machine architectures that
6010 have not been in working condition in a long time have been removed from
6011 the main source tree maintained by the GNU C Library's maintainers.
6012 These files are now reside in the separate `ports' source module
6013 that is usable as an add-on when building the library.
6017 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
6018 interrogate the dynamic linker, compatible with the Solaris interface.
6020 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
6021 implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
6023 * getifaddrs now uses the netlink interface on Linux to get its information.
6024 Implemented by Thorsten Kukuk.
6026 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
6027 Implemented by Ulrich Drepper.
6029 * support for non-executable stacks on x86 has been added. Changes mostly
6032 * regex is now much faster for multibyte locales. Changes by Jakub Jelinek
6035 * getaddrinfo now performs destination address selection according to
6040 * Thread-safe interfaces for many functions that access locale data
6041 were added in version 2.3, but these features were omitted from NEWS.
6042 Many functions have variants with an `_l' suffix that take a `locale_t'
6043 object as a parameter rather than consulting the current locale.
6044 The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
6045 create and maintain `locale_t' objects. Additionally, the new function
6046 `uselocale' sets "the current locale" (as used by functions not so
6047 parameterized) set for an individual thread. These features were added
6048 in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
6050 * The functions getresuid, getresgid, setresuid, and setresgid, which
6051 have long been available on Linux, are now declared in <unistd.h>
6052 and are now also available on the Hurd.
6054 * ELF thread-local storage support (TLS) now works on x86-64.
6056 * The new dynamic string token $LIB is expanded in shared library names.
6057 This normally expands to lib, but on some 64-bit platforms to lib64 instead.
6059 * Aldy Hernandez contributed complete software floating point support for
6060 PowerPC machines with no FPU.
6062 * fexecve is implemented on Linux.
6064 * The `btowc' function should work at least twice as fast due to
6065 specialized callbacks in the iconv modules. Implemented by Bruno Haible.
6067 * With approriate thread add-ons cancelable functions are now implemented
6068 in libc.so as well. No need to call the function in libpthread. This
6069 change allowed to finally disable the incorrect and expensive handling
6070 of weak definition in ld.so.
6072 * Yet more PLT entries in libc.so have been removed. We finally arrived
6073 at the bare minimum. Startup times improved appropriately.
6075 * Support for the new Linux/x86 system call interface was added. The
6076 AT_SYSINFO auxiliary vector entry is recognized and handled.
6080 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
6083 * iconv (the program and the interface) now accepts empty names (excluding
6084 options like //TRANSLIT) to mean "use charset of current locale".
6086 * localedef can now transliterate characters in strings which are not in
6087 the provided charmap. The information from the input locale is used.
6089 * Prelinking support was added for ELF targets. This requires additional
6090 tools and recent versions of the GNU binutils. Contributed by Jakub Jelinek.
6092 * Read-only stdio streams now use mmap to speed up operation by eliminating
6093 copying and buffer underflows. To use add 'm' to the mode string of
6094 the fopen/fdopen/freopen call. Implemented by Ulrich Drepper.
6096 * The malloc functions were completely rewritten by Wolfram Gloger based
6097 on Doug Lea's malloc-2.7.0.c.
6099 * Isamu Hasegawa contributed a completely new and POSIX-conformant
6100 implementation of regex.
6102 * Bruno Haible upgraded the iconv and locale implementation to support
6105 * Contents of the LC_* and LANG environment variables in the CEN style are
6106 not recognized anymore. It never was used. Change by Ulrich Drepper.
6108 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
6109 thread-local storage (TLS) ABI on some platforms.
6110 Changes by Ulrich Drepper. SH support by Kaz Kojima.
6112 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
6113 EUC-JISX0213, and TSCII.
6115 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
6116 BSD-compatible interface for getting all network interface addresses.
6117 Implementation for IPv4 by Roland McGrath.
6119 * Loading of locale data is faster due to the introduction of a locale
6120 archive. Implemented by Roland McGrath and Ulrich Drepper.
6122 * Startup times are significantly reduced by not using exported functions
6123 inside the library itself. Changes by Jakub Jelinek, Roland McGrath,
6126 * Steven Munroe contributed a port to PowerPC64/Linux.
6130 * The Hurd now uses the GNU libio implementation of stdio rather than the
6131 old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
6133 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
6134 with the same behavior as the Linux system call of the same name.
6138 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
6139 128-bit long double format.
6141 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
6142 IBM1161, and IBM1162 charsets.
6144 * Andreas Jaeger contributed a port to x86-64/Linux.
6146 * Peter Bruin contributed a port to PowerPC/Hurd.
6148 * libc functions using I/O streams now can handle wide-oriented streams
6151 * optimizations in the dynamic linker. Binaries created by recent binutils
6152 versions start up quicker due to reduced time spent on relocations.
6154 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
6158 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
6159 asinh, atanh, j0 for the 128-bit long double format.
6161 * Bruno Haible updated all the code handling Unicode in some form to
6162 support Unicode 3.1.
6164 * Speed of regex for single-byte locales is back to previous levels.
6165 Patch by Isamu Hasegawa.
6167 * Alpha, SPARC, and IA-64 now also using floating stacks.
6169 * Startup time of internationalized applications greatly improved through
6170 iconv cache. Use iconvconfig to generate the cache file.
6171 Contributed by Ulrich Drepper.
6173 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
6174 severe performance problems. Patch by David Mosberger.
6176 * The Hurd port got a lot more functionality like AIO, various stdio
6177 extensions, etc. Mainly done by Roland McGrath.
6179 * mtrace can now lookup symbols in shared libraries.
6183 * Intel's IA-64 math library is largely integrated. It provides fast and
6184 accurate implementatations for most basic and standard math functions
6185 in float, double, and long double format.
6187 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
6188 and asin for the 96-bit long double format and asin, log, tan for the
6189 128-bit long double format.
6191 * The beginning of a last-bit accurate math library by IBM Haifa were added.
6192 The basic double functions exist today. Contributed by Abraham Ziv
6193 <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
6194 <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
6196 * An asynchronous name lookup library was added. The interface is designed
6197 after POSIX AIO. The proposal was circulated beforehand to get comments.
6198 No negative ones came in. Implemented by Ulrich Drepper.
6200 * Port to S390/64bit contributed by Martin Schwidefsky
6201 <schwidefsky@de.ibm.com>.
6203 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
6204 of functions for Linux/IA-64.
6206 * The RPC code is now thread safe. Threads can now use the same service
6207 of different services at the same time. Patch by Eric Norum
6208 <eric.norum@usask.ca> with some help by Ulrich Drepper.
6210 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
6211 family of functions for Linux/S390.
6213 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
6214 of functions for Linux/x86.
6216 * Port to Linux/CRIS contributed by Axis Communications.
6220 * Lots of headers were cleaned up. Using the tool in the conform/ subdir
6221 we can now check for namespace violations and missing declarations. The
6222 result is that almost all headers are now Unix-compliant (as defined in
6223 the upcoming XPG6). The negative side is that some programs might need
6224 corrections, too, if they depend on the incorrect form of the headers in
6225 previous versions which defined too many symbols and included too many
6228 * regex now handles multibyte character sets correctly.
6229 Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
6231 * iconv (the program) does now conform to the upcoming XPG6 and handles
6232 charmaps. Instead of the charset names the path of charmaps can be
6233 provided and the conversion happens based on this data.
6234 Contributed by Ulrich Drepper.
6236 * The locale program now provides detailed information about the installed
6241 only lists the names of the supported locales
6245 provides details such as country, language, and codeset name.
6246 Contributed by Ulrich Drepper.
6250 * The gencat program now parses the input file according to the charset
6251 selected by the LC_CTYPE category. This is important for stateful
6252 character sets. To make generating catalogs easier there is a way
6253 to overwrite the charset selected by the locale: before the first
6254 message or $ quote line the catalog can contain a line like
6256 $ codeset=ISO-8859-2
6258 to select the charset (ISO-8859-2 in this case).
6260 Implemented by Shinya Hanataka and Ulrich Drepper.
6262 * New codeset conversion modules: IBM-922 (Estonia PC codeset),
6263 IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
6264 Contributed by Masahide Washizawa <washi@jp.ibm.com>.
6266 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
6267 <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
6269 * The LANGUAGE environment variable is now ignored unless the locale is
6270 changed from the default "C" locale.
6272 * The usual bug fixes.
6276 * Greg McGary added runtime support for bounds checking using gcc's
6277 new -fbounded-pointers option. ix86 target is complete. PowerPC
6280 * Thorsten Kukuk added secure mode support to nscd.
6282 * The Berkeley db libraries have been removed.
6284 Related, the nss_db module is now in a separate package since it
6285 obviously requires a database library being available.
6287 * Wide character I/O streams implemented by Ulrich Drepper.
6289 * Functions from the extended socket API added by Ulrich Drepper.
6291 * Functions feenableexcept and fedisableexcept to control the
6292 behaviour of individual exceptions have been added by Andreas Jaeger.
6294 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
6296 * The resolver code has been updated from bind 8.2.3-T5B which supports
6297 threads. The integration was done by Andreas Jaeger, Adam D. Bradley,
6300 This change could in some situations effect backward compatibility. Since
6301 now `_res' is a thread-local instead of a global variable, modifying it
6302 in one thread does not have any effect in other threads.
6304 The resolver library was also extended to allow IPv6 as the transport
6305 protocol for the requests. This work was done by Stig Venaas.
6307 * Compatibility code for K&R C compilers has been removed from the
6308 header files. A ISO C compiler is needed to use the library
6309 (conforming to either C89 or C99 standard).
6311 * Complete rewrite of the localedef program to support multibyte character
6312 sets. Implement handling of ISO 14651 and ISO 14652. Rewrite strcoll,
6313 strxfrm, wcscoll, and wcsxfrm functions. Make isw*() functions work.
6314 Implemented by Ulrich Drepper.
6316 Bruno Haible significantly improved the generation and use of the data
6317 structures for the wide character tables.
6319 * Plural handling in gettext implemented by Ulrich Drepper.
6321 * The utmp daemon has been removed.
6323 * The port to MIPS-Linux has been finished by Andreas Jaeger.
6325 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
6328 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
6330 * POSIX barriers implemented by Kaz Kylheku.
6332 * POSIX spawn function family implemented by Ulrich Drepper.
6334 * POSIX spinlocks are now available.
6336 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
6338 * the configure option --enable-kernel=X.Y.Z allows to strip out
6339 compatibility for kernel versions before X.Y.Z. This is currently only
6340 implemented for Linux.
6342 * the sockaddr_in6 structure changed. The IPv6 working group added a new
6343 field sin6_scope_id. This means that all programs using IPv6 should be
6344 recompiled. Don't expect binary compatibility with previous glibc
6347 * various conversion modules for IBM character sets contributed by
6350 * IA-64 port by Jes Sorensen and HJ Lu.
6364 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
6366 * New xdr functions are added; some rpc functions are now 64bit clean.
6368 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
6370 * Fixed known incompatibilities with glibc 2.0.
6372 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
6374 * Optimized a number of functions (especially the ELF dynamic loader).
6376 * Update timezone data files.
6378 * lots of charmaps corrections
6380 * some new locale definitions and charmaps
6385 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
6386 conform to POSIX member type requirements. Symbol versions have been
6387 adjusted as needed within the library, and for direct use by applications,
6388 but there is potential for problems if third-party libraries use
6389 struct timeval as part of their interface. This does not present
6390 a problem for X and other "essential" system libraries.
6392 * An additional locale model to support C++ Standard Library locale
6393 model and probably more was implemented by Ulrich Drepper.
6395 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
6398 * Miles Bader provided the `argp' function family to support hierachical
6399 command line argument parsing, layered on top of getopt.
6401 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
6403 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
6406 * scanf recognizes the %a and %A format for scanning floating point numbers.
6408 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
6409 information and interfaces for the available integer types.
6411 * about 130 new math functions were added to implement the ISO C9x math
6414 * the new header <complex.h> contains definitions of the complex math
6415 functions from ISO C 9X.
6417 * the new header <tgmath.h> defines generic macros to use complex or
6418 real valued functions.
6420 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
6422 * Andreas Jaeger provided a test suite for the math library.
6424 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
6426 * Ulrich Drepper added character set conversion functions (iconv).
6428 * Optimized string functions have been added.
6430 * The localedata addon is now part of glibc.
6432 * An implementation of profiling shared libraries was added by Ulrich Drepper.
6434 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
6435 daemon for NSS (nscd).
6437 Missing a better place here are some numbers on improvements. Under
6438 Linux 2.1.125 un-tar-ing the kernel sources takes
6442 using local files 12.19s 6.88s 22.91s
6444 using NIS 13.92s 8.91s 26.34s
6446 using NIS & nscd 10.37s 7.34s 25.30s
6448 using NIS+ 27.57s 30.37s 640.46s
6450 using NIS+ & nscd 10.25s 7.83s 26.51s
6452 using NIS & old nscd [1] 13.83s 8.32s 29.60s
6454 Keep in mind that non-namelookup related operations dominate above times.
6455 It was just a common complain that using NIS+ unpacking the kernel is
6458 [1] The old nscd implementation is not available anymore since it was
6459 distributed with glibc up to version 2.0.98 and thus is now replaced.
6461 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
6463 * Mark Kettenis provided a Hesiod NSS module.
6465 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
6466 and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
6468 * rcmd can now handle netgroups (Dick Streefland).
6470 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
6473 * Support for the IPv6 protocol has been added to the socket API, as per the
6474 latest draft standards.
6476 * Support for Linux 2.2 has been added.
6478 * Interface changes relative to the latest 2.0.x release:
6479 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6480 addseverity NEW: Unix98
6481 alphasort64 NEW: LFS
6482 argp_err_exit_status NEW: argp, GNU ext
6483 argp_error NEW: argp, GNU ext
6484 argp_failure NEW: argp, GNU ext
6485 argp_help NEW: argp, GNU ext
6486 argp_parse NEW: argp, GNU ext
6487 argp_program_bug_address NEW: argp, GNU ext
6488 argp_program_version NEW: argp, GNU ext
6489 argp_program_version_hook NEW: argp, GNU ext
6490 argp_state_help NEW: argp, GNU ext
6491 argp_usage NEW: argp, GNU ext
6492 authdes_create NEW: Secure RPC
6493 authdes_getucred NEW: Secure RPC
6494 authdes_pk_create NEW: Secure RPC
6495 backtrace NEW: GNU ext.
6496 backtrace_symbols NEW: GNU ext.
6497 backtrace_symbols_fd NEW: GNU ext.
6499 cacosf NEW: ISO C 9x
6500 cacosh NEW: ISO C 9x
6501 cacoshf NEW: ISO C 9x
6502 cacoshl NEW: ISO C 9x
6503 cacosl NEW: ISO C 9x
6510 casinf NEW: ISO C 9x
6511 casinh NEW: ISO C 9x
6512 casinhf NEW: ISO C 9x
6513 casinhl NEW: ISO C 9x
6514 casinl NEW: ISO C 9x
6516 catanf NEW: ISO C 9x
6517 catanh NEW: ISO C 9x
6518 catanhf NEW: ISO C 9x
6519 catanhl NEW: ISO C 9x
6520 catanl NEW: ISO C 9x
6521 cbc_crypt NEW: Secure RPC
6525 ccoshf NEW: ISO C 9x
6526 ccoshl NEW: ISO C 9x
6532 cimagf NEW: ISO C 9x
6533 cimagl NEW: ISO C 9x
6534 clearerr_locked REMOVED
6535 clntunix_create NEW: sunrpc ext
6537 clog10 NEW: ISO C 9x
6538 clog10f NEW: ISO C 9x
6539 clog10l NEW: ISO C 9x
6549 cprojf NEW: ISO C 9x
6550 cprojl NEW: ISO C 9x
6552 crealf NEW: ISO C 9x
6553 creall NEW: ISO C 9x
6558 csinhf NEW: ISO C 9x
6559 csinhl NEW: ISO C 9x
6562 csqrtf NEW: ISO C 9x
6563 csqrtl NEW: ISO C 9x
6567 ctanhf NEW: ISO C 9x
6568 ctanhl NEW: ISO C 9x
6570 des_setparity NEW: Secure RPC
6571 ecb_crypt NEW: Secure RPC
6572 endutxent NEW: Unix98
6574 exp10f NEW: ISO C 9x
6575 exp10l NEW: ISO C 9x
6579 fattach NEW: STREAMS
6580 fdetach NEW: STREAMS
6584 feclearexcept NEW: ISO C 9x
6585 fegetenv NEW: ISO C 9x
6586 fegetexceptflag NEW: ISO C 9x
6587 fegetround NEW: ISO C 9x
6588 feholdexcept NEW: ISO C 9x
6590 feraiseexcept NEW: ISO C 9x
6591 ferror_locked REMOVED
6592 fesetenv NEW: ISO C 9x
6593 fesetexceptflag NEW: ISO C 9x
6594 fesetround NEW: ISO C 9x
6595 fetestexcept NEW: ISO C 9x
6596 feupdateenv NEW: ISO C 9x
6597 fflush_locked REMOVED
6601 fgets_unlocked NEW: GNU ext.
6602 fileno_locked REMOVED
6614 fputc_locked REMOVED
6615 fputs_unlocked NEW: GNU ext.
6616 fread_unlocked NEW: GNU ext.
6621 fstatvfs NEW: Unix98
6625 ftruncate64 NEW: LFS
6627 fwrite_unlocked NEW: GNU ext.
6628 gai_strerror NEW: IPv6
6632 getchar_locked REMOVED
6634 getdate_err NEW: Unix98
6635 getdate_r NEW: GNU ext.
6637 getnameinfo NEW: IPv6
6638 getnetname NEW: Secure RPC
6639 getpmsg NEW: STREAMS
6640 getpt NEW: Unix98 PTY
6641 getrlimit64 NEW: LFS
6642 getutxent NEW: Unix98
6643 getutxid NEW: Unix98
6644 getutxline NEW: Unix98
6645 glob64 NEW: GNU ext.
6646 globfree64 NEW: GNU ext.
6647 gnu_get_libc_release NEW: GNU ext.
6648 gnu_get_libc_version NEW: GNU ext.
6649 grantpt NEW: Unix98 PTY
6650 host2netname NEW: Secure RPC
6652 iconv_close NEW: iconv
6653 iconv_open NEW: iconv
6654 if_freenameindex NEW: IPv6
6655 if_indextoname NEW: IPv6
6656 if_nameindex NEW: IPv6
6657 if_nametoindex NEW: IPv6
6658 in6addr_any NEW: IPv6
6659 in6addr_loopback NEW: IPv6
6660 inet6_isipv4mapped NEW: IPv6
6661 isastream NEW: STREAMS
6662 iswblank NEW: GNU ext.
6663 key_decryptsession NEW: Secure RPC
6664 key_decryptsession_pk NEW: Secure RPC
6665 key_encryptsession NEW: Secure RPC
6666 key_encryptsession_pk NEW: Secure RPC
6667 key_gendes NEW: Secure RPC
6668 key_get_conv NEW: Secure RPC
6669 key_secretkey_is_set NEW: Secure RPC
6670 key_setnet NEW: Secure RPC
6671 key_setsecret NEW: Secure RPC
6672 llrint NEW: ISO C 9x
6673 llrintf NEW: ISO C 9x
6674 llrintl NEW: ISO C 9x
6675 llround NEW: ISO C 9x
6676 llroundf NEW: ISO C 9x
6677 llroundl NEW: ISO C 9x
6682 lrintf NEW: ISO C 9x
6683 lrintl NEW: ISO C 9x
6684 lround NEW: ISO C 9x
6685 lroundf NEW: ISO C 9x
6686 lroundl NEW: ISO C 9x
6688 makecontext NEW: Unix98
6689 mempcpy NEW: GNU ext.
6692 modify_ldt NEW: kernel
6696 nearbyint NEW: ISO C 9x
6697 nearbyintf NEW: ISO C 9x
6698 nearbyintl NEW: ISO C 9x
6699 netname2host NEW: Secure RPC
6700 netname2user NEW: Secure RPC
6701 nexttoward NEW: ISO C 9x
6702 nexttowardf NEW: ISO C 9x
6703 nexttowardl NEW: ISO C 9x
6707 passwd2des NEW: Secure RPC
6709 pow10f NEW: GNU ext.
6710 pow10l NEW: GNU ext.
6713 printf_size NEW: GNU ext.
6714 printf_size_info NEW: GNU ext.
6715 profil_counter REMOVED
6716 pthread_mutexattr_getkind_np REPLACED
6717 pthread_mutexattr_setkind_np REPLACED
6718 ptsname NEW: Unix98 PTY
6719 ptsname_r NEW: Unix98 PTY
6721 putchar_locked REMOVED
6722 putgrent NEW: GNU ext.
6724 putpmsg NEW: STREAMS
6725 pututxline NEW: Unix98
6729 readdir64_r NEW: LFS
6730 remquo NEW: ISO C 9x
6731 remquof NEW: ISO C 9x
6732 remquol NEW: ISO C 9x
6734 roundf NEW: ISO C 9x
6735 roundl NEW: ISO C 9x
6737 scalbln NEW: ISO C 9x
6738 scalblnf NEW: ISO C 9x
6739 scalblnl NEW: ISO C 9x
6741 sendfile NEW: kernel
6742 setcontext NEW: Unix98
6743 setrlimit64 NEW: LFS
6744 setutxent NEW: Unix98
6746 sigignore NEW: Unix98
6747 sigqueue NEW: POSIX.1b
6748 sigrelse NEW: Unix98
6749 sigset NEW: POSIX.1b
6750 sigtimedwait NEW: POSIX.1b
6751 sigwaitinfo NEW: POSIX.1b
6752 sincos NEW: GNU ext.
6753 sincosf NEW: GNU ext.
6754 sincosl NEW: GNU ext.
6758 strcasestr NEW: GNU ext.
6759 strtoimax NEW: ISO C 9x
6760 strtoumax NEW: ISO C 9x
6761 strverscmp NEW: GNU ext.
6762 svcauthdes_stats NEW: Secure RPC
6763 svcunix_create NEW: sunrpc etx
6764 svcunixfd_create NEW: sunrpc ext
6765 swapcontext NEW: Unix98
6766 tcgetsid NEW: Unix98 PTY
6767 tdestroy NEW: GNU ext.
6768 tgamma NEW: ISO C 9x
6769 tgammaf NEW: ISO C 9x
6770 tgammal NEW: ISO C 9x
6774 truncf NEW: ISO C 9x
6775 truncl NEW: ISO C 9x
6777 unlockpt NEW: Unix98 PTY
6778 updwtmpx NEW: Unix98
6779 user2netname NEW: Secure RPC
6780 utmpxname NEW: Unix98
6781 versionsort NEW: GNU ext.
6782 versionsort64 NEW: GNU ext.
6784 wcscasecmp NEW: GNU ext.
6785 wcsncasecmp NEW: GNU ext.
6786 wcsnlen NEW: GNU ext.
6787 wcstoimax NEW: ISO C 9x
6788 wcstoll NEW: ISO C 9x
6789 wcstoull NEW: ISO C 9x
6790 wcstoumax NEW: ISO C 9x
6792 wordexp NEW: POSIX.2
6793 wordfree NEW: POSIX.2
6794 write_profiling REMOVED
6795 xdecrypt NEW: Secure RPC
6796 xdr_authdes_cred NEW: Secure RPC
6797 xdr_authdes_verf NEW: Secure RPC
6798 xdr_cryptkeyarg NEW: Secure RPC
6799 xdr_cryptkeyarg2 NEW: Secure RPC
6800 xdr_cryptkeyres NEW: Secure RPC
6801 xdr_getcredres NEW: Secure RPC
6802 xdr_key_netstarg NEW: Secure RPC
6803 xdr_key_netstres NEW: Secure RPC
6804 xdr_keybuf NEW: Secure RPC
6805 xdr_keystatus NEW: Secure RPC
6806 xdr_netnamestr NEW: Secure RPC
6807 xdr_sizeof NEW: Secure RPC
6808 xdr_unixcred NEW: sunrpc ext
6809 xencrypt NEW: Secure RPC
6810 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6821 * inet_ntoa is thread-safe
6823 * updwtmp is moved from libutil to libc
6825 * rewrite of cbrt function
6827 * update of timezone data
6841 * add atoll function
6843 * fix complex problems in Berkeley DB code
6845 * fix math functions
6849 * fixed lots of header problems (especially Linux/GNU specific)
6851 * dynamic loader preserves all registers
6853 * Roland McGrath provided support for handling of auxiliary objects in
6854 the ELF dynamic loader.
6856 * support for parallel builds is improved
6860 * GNU extensions are no longer declared by default. To enable them you
6861 must define the macro `_GNU_SOURCE' in your program or compile with
6864 * The library has changed from using GNU ld symbol aliases to using weak
6865 symbols where available. The ELF object file format supports weak
6866 symbols; GNU ld also supports weak symbols in the a.out format. (There
6867 is also now support for other GNU ld extensions in ELF. Use the
6868 `--with-elf' option to configure to indicate you have ELF, and
6869 `--with-gnu-ld' if using GNU ld.) This change resulted in the deletion
6870 of many files which contained only symbol aliases, reducing the size of
6871 the source and the compiled library; many other files were renamed to
6872 less cryptic names previously occupied by the symbol alias files.
6873 There is a new header file <elf.h> for programs which operate on
6874 files in the ELF format.
6876 * Converted to Autoconf version 2, so `configure' has more options.
6877 Run `configure --help' to see the details.
6879 * The library can now be configured to build profiling, highly-optimized
6880 (but undebuggable), and/or shared libraries (ELF with GNU ld only). The
6881 `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
6882 `configure' enable building these extra libraries. The shared library is
6883 built by default when using both ELF and GNU ld. When shared libraries
6884 are enabled, the new library `-ldl' is available for arbitrary run-time
6885 loading of shared objects; its interface is defined in <dlfcn.h>. The
6886 new header file <link.h> gives access to the internals of the run-time
6887 dynamic linker, `ld.so'. The shell script `ldd' is similar to the
6888 application of same name on other systems and it provides information
6889 about dynamically linked binaries.
6891 * The C library now provides the run-time support code for profiling
6892 executables compiled with `-pg'. Programs can control the profiling code
6893 through the interface in <sys/gmon.h>. The `gmon.out' files written by
6894 the GNU C library can be read only by GNU `gprof' (from GNU binutils);
6895 the support for this file format was contributed by David Mosberger-Tang.
6897 * The math code has been replaced with a math library based on fdlibm from
6898 Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
6899 Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
6900 functions. The math functions now reside in a separate library, so
6901 programs using them will need to use `-lm' their linking commands.
6903 * John C. Bowman contributed optimized ix87 assembler inline functions.
6905 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
6906 mechanism similar to that found in Solaris 2. This is now used for the
6907 group, passwd, hosts, networks, services, protocols, rpc, ethers,
6908 shadow, netgroup, publickey, and alias databases. The `nsswitch.conf'
6909 file controls what services are used for each individual database. This
6910 works by loading shared libraries with names specified in `nsswitch.conf',
6911 so service modules can be changed or added at any time without even
6912 relinking any program. Currently there are the file, db, and NIS based
6913 NSS services available.
6915 * The new functions `strtoq' and `strtouq' parse integer values from
6916 strings, like `strtol' and `strtoul', but they return `long long int' and
6917 `unsigned long long int' values, respectively (64-bit quantities).
6919 * The new functions `strtof' and `strtold' parse floating-point values from
6920 strings, like `strtod', but they return `float' and `long double' values,
6921 respectively (on some machines `double' and `long double' are the same).
6923 * Ulrich Drepper has contributed new implementations of the floating-point
6924 printing and reading code used in the `printf' family of functions and
6925 `strtod', `strtof', and `strtold'. These new functions are perfectly
6926 accurate, and much faster than the old ones.
6928 * The implementation of the POSIX locale model was completely rewritten by
6929 Ulrich Drepper. This includes the new programs `localedef' and `locale'
6930 to compile the POSIX locale definition.
6932 * The former dummy implementations of the strcoll and strxfrm function are
6933 now replaced by fully functional code contributed by Ulrich Drepper. The
6934 collation information comes from the POSIX locale definitions.
6936 * The new header <langinfo.h> defines an interface for accessing
6937 various locale-dependent data (using the locale chosen with `setlocale').
6939 * Ulrich Drepper has contributed a new suite of functions for operation on
6940 wide-character and multibyte-character strings, in <wchar.h>;
6941 and classification and case conversion of wide characters, in <wctype.h>.
6942 These new functions are conforming to the ISO C, Amendement 1 specification.
6944 * There is now a second implementation of the standard I/O library available.
6945 It comes from GNU libg++ as was written by Per Bothner, heavily modified
6946 by Hongjiu Lu and made thread safe by Ulrich Drepper.
6948 * You can now use positional parameter specifications in format strings
6949 for the `printf' and `scanf' families of functions. For example,
6950 `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
6951 ``Number 6, Mr Jones''. This is mainly useful when providing different
6952 format strings for different languages, whose grammars may dictate
6953 different orderings of the values being printed. To support this
6954 feature, the interface for `register_printf_handler' has changed; see
6955 the header file <printf.h> for details.
6957 * The `printf' and `scanf' families of functions now understand a new
6958 formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
6959 to group numbers as indicated by the locale; for `scanf' and friends, this
6960 says to accept as valid only a number with all the proper grouping
6961 separators in the right places. In the default "C" locale, numbers are
6962 not grouped; but locales for specific countries will define the usual
6963 conventions (i.e. separate thousands with `,' in the US locale).
6965 * The pgrp functions have been regularized, slightly incompatibly but much
6966 less confusingly. The core functions are now `getpgid' and `setpgid',
6967 which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
6968 argument) and BSD `setpgrp' (identical to `setpgid') functions are
6969 provided for compatibility. There is no longer an incompatible `getpgrp'
6970 with an argument declared under _BSD_SOURCE; no BSD code uses it.
6972 * The new header file <fts.h> and suite of functions simplify programs that
6973 operate on directory trees. This code comes from 4.4 BSD.
6975 * The resolver code has been updated from the BIND 4.9.5-P1 release.
6976 Parts of the code were heavily modified by Ulrich Drepper to fit in the
6977 NSS scheme used in glibc.
6979 * There is a new malloc debugging hook `__memalign_hook'.
6981 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
6982 `unsigned int' in <sys/types.h>. These are for compatibility only and
6983 their use is discouraged.
6985 * The `-lmcheck' library to enable standard malloc debugging hooks is now
6986 done differently, so that it works even without GNU ld.
6988 * New function `euidaccess' checks allowed access to a file like `access',
6989 but using the effective IDs instead of the real IDs.
6991 * The time zone data files have been updated for the latest and greatest
6992 local time conventions of the countries of the world.
6994 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
6997 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
6998 for formatting floating-point numbers. They are provided only for
6999 compatibility; new programs should use `sprintf' instead. There are
7000 also equivalent function for the `long double' floating-point type and
7001 all functions also exist in a reentrant form.
7003 * The new auxiliary library `-lutil' from 4.4 BSD contains various
7004 functions for maintaining the login-record files (primarily of use to
7005 system programs such as `login'), and convenient functions for
7006 allocating and initializing a pseudo-terminal (pty) device.
7008 * Ulrich Drepper has contributed new support for System V style
7009 shared memory and IPC on systems that support it.
7011 * Ulrich Drepper has contributed several miscellaneous new functions found
7012 in System V: The `hsearch' family of functions provide an effective
7013 implementation of hash tables; `a64l' and `l64a' provide a very simple
7014 binary to ASCII mapping; `drand48' and friends provide a 48-bit random
7017 * Ulrich Drepper has contributed new reentrant counterparts for the
7018 `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
7020 * Ulrich Drepper has contributed new, highly-optimized versions of several
7021 string functions for the i486/Pentium family of processors.
7023 * Ulrich Drepper has updated the Linux-specific code, based largely
7024 on work done in Hongjiu Lu's version of GNU libc for Linux.
7025 The GNU library now supports Linux versions 2.0.10 and later,
7026 using the ELF object file format (i[3456]86-*-linux).
7028 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
7030 * David Mosberger-Tang and Richard Henderson have ported the C library
7031 to Linux/Alpha (alpha-*-linux). Richard Henderson contributed the
7032 dynamic linking support for ELF/Alpha.
7034 * Richard Henderson contributed several Alpha optimized assembler function
7035 for arithmetic and string handling.
7037 * Ulrich Drepper has contributed a new set of message catalog functions to
7038 support multiple languages using the <libintl.h> interface, for use with
7039 his new package GNU gettext. Translation volunteers have contributed
7040 catalogs of the library's messages in Spanish, German, and Korean.
7042 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
7043 program and the `catgets' function for reading the catalog files it
7044 creates. (The <libintl.h> interface is preferred; we include the
7045 <nl_types.h> interface using `catgets' only for source compatibility with
7046 programs already written to use it.)
7048 * New header file <values.h> gives SVID-compatible names for <limits.h>
7051 * Various new macros, declarations, and small header files for compatibility
7054 * New function `group_member' is a convenient way to check if a process has
7055 a given effective group ID.
7057 * When using GCC 2.7 and later, the socket functions are now declared in a
7058 special way so that passing an argument of type `struct sockaddr_in *',
7059 `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
7060 `struct sockaddr *' type, does not generate a type-clash warning.
7062 * New function `error' declared in header file <error.h> is a convenient
7063 function for printing error messages and optionally exiting; this is the
7064 canonical function used in GNU programs. The new functions `err', `warn',
7065 and friends in header file <err.h> are the canonical 4.4 BSD interface for
7066 doing the same thing.
7068 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
7069 POSIX.2 `glob' function to do ~ and {...} expansion.
7071 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
7072 `clearenv' which is used in POSIX.9 is also available.
7074 * New function `getsid' returns session ID number on systems that support it.
7076 * We have incorporated the 4.4 BSD `db' library (version 1.85). New header
7077 files <db.h> and <mpool.h> provide a rich set of functions for several
7078 types of simple databases stored in memory and in files, and <ndbm.h> is
7079 an old `ndbm'-compatible interface using the `db' functions. Link with
7080 `-ldb' to get these functions.
7082 * New macro `strdupa' copies a string like `strdup', but uses local stack
7083 space from `alloca' instead of dynamic heap space from `malloc'.
7085 * New function `strnlen' is like `strlen' but searches only a given maximum
7086 number of characters for the null terminator. `stpncpy', `strndup' and
7087 `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
7090 * New function `statfs' in header <sys/statfs.h>.
7092 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
7093 provide convenient functions for operating on blocks of null-terminated
7096 * A new suite of functions in <utmp.h> handle all the details of reading
7097 and writing the utmp file.
7099 * An implementation of the NIS/YP(tm) based NSS service was contributed by
7102 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
7103 completely POSIX compliant and also implemented the extended functionality
7104 to handle alternate digit representation and alternate era date formats.
7106 * Ulrich Drepper provided an implementation of the `strptime' function
7107 defined in XPG4.2 which transforms a string into a `struct tm' value.
7109 * Paul Eggert provided the tzselect shell script as part of the timezone
7110 code. The shell script makes it easy to select the correct timezone
7113 * The implementation of the malloc family of functions is completely replaced
7114 by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
7115 The implementation uses the mmap function (if available) and it is
7116 optimized for the use in multi threaded programs.
7118 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
7119 functions. This new functionality is usable by specifying a special
7120 salt string and it is compatible with implementation on *BSD systems.
7122 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
7123 `getsubopt' to handle second level command line options, `bsd_signal'
7124 to access BSD style `signal' functionality, the obsolete `regexp' style
7127 * the `lchown' function is available on system which support this
7130 * The implementation of the shadow password handling function was contributed
7133 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
7135 * POSIX.1g support was added. The <sys/select.h> header is available,
7136 `isfdtype' and `pselect' are implemented. Craig Metz contributed an
7137 implementation of `getaddrinfo'.
7141 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
7143 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
7144 friends, for parsing /etc/fstab. This code comes from 4.4 BSD.
7146 * The new function `daemon' from 4.4 BSD is useful for server programs that
7147 want to put themselves in the background.
7149 * Joel Sherrill has contributed support for several standalone boards that
7150 run without an operating system.
7152 * `printf', `scanf' and friends now accept a `q' type modifier for long
7153 long int as well as `ll'. Formats using these might be `%qu' or `%lld'.
7155 * All of the code taken from BSD (notably most of the math and networking
7156 routines) has been updated from the BSD 4.4-Lite release.
7158 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
7160 * The new functions `getdomainname' and `setdomainname' fetch or change the
7161 YP/NIS domain name. These are system calls which exist on systems which
7164 * The time zone data files have been updated for the latest international
7167 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
7168 $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
7172 * The C library now includes support for Sun RPC, from Sun's free
7173 RPCSRC-4.0 distribution. The `portmap', `rpcinfo', and `rpcgen' programs
7174 are included. (There is still no support for YP.)
7176 * Tom Quinn has contributed a port of the C library to SGI machines running
7177 Irix 4 (mips-sgi-irix4).
7179 * The new `lockf' function is a simplified interface to the locking
7180 facilities of `fcntl', included for compatibility.
7182 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
7184 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
7186 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
7189 * The error message printed by `assert' for a failed assertion now includes
7190 the name of the program (if using GNU ld) and the name of the calling
7191 function (with versions of GCC that support this).
7193 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
7195 * The library now includes the <sys/mman.h> header file and memory
7196 management functions `mmap', `munmap', `mprotect', `msync', and
7197 `madvise', on systems that support those facilities.
7199 * The interface for `mcheck' has changed slightly: the function called to
7200 abort the program when an allocation inconsistency is detected now takes
7201 an argument that indicates the type of failure. The new function
7202 `mprobe' lets you request a consistency check for a particular block at
7203 any time (checks are normally done only when you call `free' or `realloc'
7206 * It is now possible to easily cross-compile the C library, building on one
7207 system a library to run on another machine and/or operating system. All
7208 you need to do is set the variable `HOST_CC' in `configparms' to the
7209 native compiler for programs to run on the machine you are building on (a
7210 few generator programs are used on Unix systems); set `CC' to the
7213 * The new function `fexecve' (only implemented on the GNU system) executes
7214 a program file given a file descriptor already open on the file.
7218 * Brendan Kehoe has contributed most of a port to the DEC Alpha
7219 running OSF/1 (alpha-dec-osf1). He says it is 75% complete.
7221 * You can set the variable `libprefix' in `configparms' to specify a prefix
7222 to be prepended to installed library files; this makes it easy to install
7223 the GNU C library to be linked as `-lgnuc' or whatever.
7225 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
7226 copies a limited number of characters from a string, and returns the
7227 address of the last character written.
7229 * You no longer need to check for whether the installed `stddef.h' is
7230 compatible with the GNU C library. configure now checks for you.
7232 * You can now define a per-stream `fileno' function to convert the
7233 stream's cookie into an integral file descriptor.
7235 * ``malloc (0)'' no longer returns a null pointer. Instead, it
7236 allocates zero bytes of storage, and returns a unique pointer which
7237 you can pass to `realloc' or `free'. The behavior is undefined if
7238 you dereference this pointer.
7240 * The C library now runs on Sony NEWS m68k machines running either
7241 NewsOS 3 or NewsOS 4.
7243 * The new `syscall' function is a system-dependent primitive function
7244 for invoking system calls. It has the canonical behavior on Unix
7245 systems, including unreliable return values for some calls (such as
7246 `pipe', `fork' and `getppid').
7248 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
7249 to `EAGAIN', which is the preferred name. On systems whose kernels
7250 use two distinct codes, the C library now translates EWOULDBLOCK to
7251 EAGAIN in every system call function.
7255 * The GNU C Library Reference Manual is now distributed with the library.
7256 `make dvi' will produce a DVI file of the printed manual.
7257 `make info' will produce Info files that you can read on line using C-h i
7258 in Emacs or the `info' program.
7259 Please send comments on the manual to bug-glibc-manual@gnu.org.
7261 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
7263 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
7265 * Jason Merrill has contributed a port to the Sequent Symmetry running
7266 Dynix version 3 (i386-sequent-dynix).
7268 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
7269 ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
7271 * New function `memory_warnings' lets you arrange to get warnings when
7272 malloc is running out of memory to allocate, like Emacs gives you.
7274 * The C library now contains the relocating allocator used in Emacs 19 for
7275 its editing buffers. This allocator (ralloc) minimizes allocation
7276 overhead and fragmentation by moving allocated regions around whenever it
7277 needs to. You always refer to a ralloc'd region with a "handle" (a
7278 pointer to a pointer--an object of type `void **').
7280 * There is a new `printf' format: `%m' gives you the string corresponding
7281 to the error code in `errno'.
7283 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
7284 or `%[' conversion, but instead of filling in a fixed-sized buffer you
7285 pass, the `a' modifier says to fill in a `char **' you pass with a
7288 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
7289 `FNM_CASEFOLD'. `FNM_LEADING_DIR' lets a pattern like `foo*' match a
7290 name like `foo/bar'. `FNM_CASEFOLD' says to ignore case in matching.
7292 * `mkstemp' is a traditional Unix function to atomically create and open a
7293 uniquely-named temporary file.
7297 * The standard location for the file that says what the local timezone is
7298 has changed again. It is now `/usr/local/etc/localtime' (or more
7299 precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
7301 * The distribution no longer contains any files with names longer than 14
7304 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
7305 These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
7307 * New functions `ttyslot' and `syslog' from 4.4 BSD.
7311 * The configuration process has changed quite a bit. The `configure'
7312 script is now used just like the configuration scripts for other GNU
7313 packages. The `sysdeps' directory hierarchy is much rearranged.
7314 The file `INSTALL' explains the new scheme in detail.
7316 * The header files no longer need to be processed into ANSI C and
7317 traditional C versions. There is just one set of files to install, and
7318 it will work with ANSI or old C compilers (including `gcc -traditional').
7320 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
7321 MIPS DECStation running Ultrix 4.
7323 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
7324 Tom Quinn contributed the initial code. The GNU C library can NOT yet be
7325 made itself into a shared library.
7327 * Yet further improved support for the i386, running 4.3 BSD-like systems
7328 (such as Mach 3 with the Unix single-server), or System V.
7330 * New function `strncasecmp' to do case-insensitive string comparison
7331 with limited length.
7333 * New function `strsep' is a reentrant alternative to `strtok'.
7335 * New functions `scandir' and `alphasort' for searching directories.
7337 * New function `setenv' is a better interface to `putenv'.
7339 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
7340 function for traversing a directory tree.
7342 * The GNU obstack package is now also part of the C library.
7343 The new function `open_obstack_stream' creates a stdio stream that
7344 writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
7345 formatted output directly to an obstack.
7347 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
7348 cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
7350 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
7352 * The new functions `strfry' and `memfrob' do mysterious and wonderful
7353 things to your strings.
7355 * There are some new test programs: test-fseek, testmb, and testrand.
7357 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
7358 These ports are not finished, but are a good starting place for really
7359 supporting those systems.
7361 * `/etc/localtime' is now the standard location for the file that says what
7362 the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
7363 This follows the general principle that `/etc' is the place for all local
7364 configuration files.
7366 * The C library header files now use `extern "C"' when used by the C++
7367 compiler, so the C library should now work with C++ code.
7369 * The header file <bstring.h> is gone. <string.h> now declares bcopy,
7370 bcmp, bzero, and ffs. (Update: nowadays these functions are declared
7373 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
7374 function which uses the `merge sort' algorithm, and is said to be
7375 significantly faster than the old GNU `qsort' function. Merge sort is
7376 now the standard `qsort' function. The new algorithm can require a lot
7377 of temporary storage; so, the old sorting function is called when the
7378 required storage is not available.
7380 * The C library now includes Michael Glad's Ultra Fast Crypt, which
7381 provides the Unix `crypt' function, plus some other entry points.
7383 * The code and header files taken from 4.4 BSD have been updated with the
7384 latest files released from Berkeley.
7386 ----------------------------------------------------------------------
7389 Permission is granted to anyone to make or distribute verbatim copies
7390 of this document as received, in any medium, provided that the
7391 copyright notice and this permission notice are preserved,
7392 thus giving the recipient permission to redistribute in turn.
7394 Permission is granted to distribute modified versions
7395 of this document, or of portions of it,
7396 under the above conditions, provided also that they
7397 carry prominent notices stating who last changed them.
7400 version-control: never