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The GNU C Library ================= The GNU C Library version 2.32 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.32 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.32 ===================== Major new features: * Unicode 13.0.0 Support: Character encoding, character type info, and transliteration tables are all updated to Unicode 13.0.0, using generator scripts contributed by Mike FABIAN (Red Hat). * New locale added: ckb_IQ (Kurdish/Sorani spoken in Iraq) * Support for Synopsys ARC HS cores (ARCv2 ISA) running Linux has been added. This port requires at least binutils-2.32, gcc-8.3 and Linux-5.1. Three ABIs are supported: - arc-linux-gnu - arc-linux-gnuhf - arceb-linux-gnu The arc* ABI is little-endian while arceb is big-endian. All ABIs use 64-bit time (y2038 safe) and 64-bit file offsets (LFS default). * The GNU C Library now loads audit modules listed in the DT_AUDIT and DT_DEPAUDIT dynamic section entries of the main executable. * powerpc64le supports IEEE128 long double libm/libc redirects when using the -mabi=ieeelongdouble to compile C code on supported GCC toolchains. It is recommended to use GCC 8 or newer when testing this option. * To help detect buffer overflows and other out-of-bounds accesses several APIs have been annotated with GCC 'access' attribute. This should help GCC 10 issue better warnings. * On Linux, functions the pthread_attr_setsigmask_np and pthread_attr_getsigmask_np have been added. They allow applications to specify the signal mask of a thread created with pthread_create. * The GNU C Library now provides the header file <sys/single_threaded.h> which declares the variable __libc_single_threaded. Applications are encouraged to use this variable for single-thread optimizations, instead of weak references to symbols historically defined in libpthread. * The functions sigabbrev_np and sigdescr_np have been added. The sigabbrev_np returns the abbreviated signal name (e.g. "HUP" for SIGHUP) while sigdescr_np returns a string describing the signal number (e.g "Hangup" for SIGHUP). Different than strsignal, sigdescr_np does not attempt to translate the return description, both functions return NULL for an invalid signal number. They should be used instead of sys_siglist or sys_sigabbrev and they are both thread and async-signal safe. These functions are GNU extensions. * The functions strerrorname_np and strerrordesc_np have been added. The strerroname_np returns error number name (e.g. "EINVAL" for EINVAL) while strerrordesc_np returns string describing error number (e.g "Invalid argument" for EINVAL). Different than strerror, strerrordesc_np does not attempt to translate the return description, both functions return NULL for an invalid error number. They should be used instead of sys_errlist and sys_nerr, both are thread and async-signal safe. These functions are GNU extensions. * AArch64 now supports standard branch protection security hardening in glibc when it is built with a GCC that is configured with --enable-standard-branch-protection (or if -mbranch-protection=standard flag is passed when building both GCC target libraries and glibc, in either case a custom GCC is needed). This includes branch target identification (BTI) and pointer authentication for return addresses (PAC-RET). They require armv8.5-a and armv8.3-a architecture extensions respectively for the protection to be effective, otherwise the used instructions are nops. User code can use PAC-RET without libc support, but BTI requires a libc that is built with BTI support, otherwise runtime objects linked into user code will not be BTI compatible. Deprecated and removed features, and other changes affecting compatibility: * Remove configure option --enable-obsolete-rpc. Sun RPC is removed from glibc. This includes the rpcgen program, librpcsvc, and the Sun RPC header files. Backward compatibility for old programs is kept only for architectures and ABIs that have been added in or before glibc 2.31. New programs need to use TI-RPC <http://git.linux-nfs.org/?p=steved/libtirpc.git;a=summary> and rpcsvc-proto <https://github.com/thkukuk/rpcsvc-proto>. * Remove configure option --enable-obsolete-nsl. libnsl is only built as shared library for backward compatibility and the NSS modules "nis" and "nisplus" are not built at all and libnsl's headers aren't installed. This compatibility is kept only for architectures and ABIs that have been added in or before version 2.28. Replacement implementations based on TI-RPC, which additionally support IPv6, are available from <https://github.com/thkukuk/>. This change does not affect the "compat" NSS module, which does not depended on libnsl since 2.27 and thus can be used without NIS. * The deprecated <sys/sysctl.h> header and the sysctl function have been removed. To support old binaries, the sysctl function continues to exist as a compatibility symbol (on those architectures which had it), but always fails with ENOSYS. This reflects the removal of the system call from all architectures, starting with Linux 5.5. * The sstk function is no longer available to newly linked binaries. Its implementation always returned with a failure, and the function was not declared in any header file. * The legacy signal handling functions siginterrupt, sigpause, sighold, sigrelse, sigignore and sigset, and the sigmask macro have been deprecated. Applications should use the sigsuspend, sigprocmask and sigaction functions instead. * ldconfig now defaults to the new format for ld.so.cache. glibc has already supported this format for almost 20 years. * The deprecated arrays sys_siglist, _sys_siglist, and sys_sigabbrev are no longer available to newly linked binaries, and their declarations have been removed from <string.h>. They are exported solely as compatibility symbols to support old binaries. All programs should use strsignal instead. * The deprecated symbols sys_errlist, _sys_errlist, sys_nerr, and _sys_nerr are no longer available to newly linked binaries, and their declarations have been removed from from <stdio.h>. They are exported solely as compatibility symbols to support old binaries. All programs should use strerror or strerror_r instead. * Both strerror and strerror_l now share the same internal buffer in the calling thread, meaning that the returned string pointer may be invalided or contents might be overwritten on subsequent calls in the same thread or if the thread is terminated. It makes strerror MT-safe. * Using weak references to libpthread functions such as pthread_create or pthread_key_create to detect the singled-threaded nature of a program is an obsolescent feature. Future versions of glibc will define pthread_create within libc.so.6 itself, so such checks will always flag the program as multi-threaded. Applications should check the __libc_single_threaded variable declared in <sys/single_threaded.h> instead. * The "files" NSS module no longer supports the "key" database (used for secure RPC). The contents of the /etc/publickey file will be ignored, regardless of the settings in /etc/nsswitch.conf. (This method of storing RPC keys only supported the obsolete and insecure AUTH_DES flavor of secure RPC.) * The __morecore and __after_morecore_hook malloc hooks and the default implementation __default_morecore have been deprecated. Applications should use malloc interposition to change malloc behavior, and mmap to allocate anonymous memory. A future version of glibc may require that applications which use the malloc hooks must preload a special shared object, to enable the hooks. * The hesiod NSS module has been deprecated and will be removed in a future version of glibc. System administrators are encouraged to switch to other approaches for networked account databases, such as LDAP. Changes to build and runtime requirements: * powerpc64le requires GCC 7.4 or newer. This is required for supporting long double redirects. Security related changes: CVE-2016-10228: An infinite loop has been fixed in the iconv program when invoked with the -c option and when processing invalid multi-byte input sequences. Reported by Jan Engelhardt. CVE-2020-10029: Trigonometric functions on x86 targets suffered from stack corruption when they were passed a pseudo-zero argument. Reported by Guido Vranken / ForAllSecure Mayhem. CVE-2020-1752: A use-after-free vulnerability in the glob function when expanding ~user has been fixed. CVE-2020-6096: A signed comparison vulnerability in the ARMv7 memcpy and memmove functions has been fixed. Discovered by Jason Royes and Samual Dytrych of the Cisco Security Assessment and Penetration Team (See TALOS-2020-1019). The following bugs are resolved with this release: [9809] localedata: ckb_IQ: new Kurdish Sorani locale [10441] manual: Backtraces code example lacks error checking [10815] librt: [timer_create / SIGEV_THREAD] signalmask of timer_sigev_thread dangerous [14231] stdio: stdio-common tests memory requirements [14578] libc: /proc-based emulation for lchmod, fchmodat [16272] dynamic-link: dlopen()ing a DT_FILTER library crashes if filtee has constructor [19519] locale: iconv(1) with -c option hangs on illegal multi-byte sequences (CVE-2016-10228) [19737] admin: Doc page “20.5.2 Infinity and NaN” has incorrect HTML character entities for infinity & pi [20338] libc: Parsing of /etc/gshadow can return bad pointers causing segfaults in applications [20543] libc: Please move from .gnu.linkonce to comdat [22489] network: gcc warns about implicit convertion in ICMP6_FILTER_SETPASS with -Wsign-conversion [22525] localedata: or_IN LC_COLLATE does not use copy "iso14651_t1" [23294] math: Complex _FloatN functions are redirected to the wrong function with -mlong-double-64 [23296] libc: Data race in setting function descriptor during lazy binding [23668] dynamic-link: ldconfig: Default to the new format for ld.so.cache [23819] hurd: hurd: Add C11 thread support [23990] build: test-container error out on failure to exec child. [23991] build: shell-container typo in run_command_array [24638] manual: Error in example of parsing a template string [24654] manual: Wrong declaration of wcschr in libc manual [24943] dynamic-link: Support DT_AUDIT, DT_DEPAUDIT in the dynamic linker [25051] dynamic-link: aarch64, powerpc64 uses surplus static tls for dynamically loaded dsos [25098] nptl: nptl: ctype classification functions are not AS-Safe [25219] libc: improve out-of-bounds checking with GCC 10 attribute access [25262] libc: getcontext/setcontext/swapcontext unnecessarily save and restore EAX, ECX and EDX [25397] dynamic-link: Legacy bitmap doesn't cover jitted code [25414] glob: 'glob' use-after-free bug (CVE-2020-1752) [25420] network: Race condition in resolv_conf.c can result in caching stale configuration forever [25487] math: sinl() stack corruption from crafted input (CVE-2020-10029) [25506] build: configure: broken detection of STT_GNU_IFUNC when GCC defaults to PIE [25523] libc: MIPS/Linux inline syscall template is miscompiled [25620] libc: Signed comparison vulnerability in the ARMv7 memcpy() (CVE-2020-6096) [25623] libc: test-sysvmsg, test-sysvsem, test-sysvshm fail with 2.31 on 32 bit and old kernel [25635] libc: arm: Wrong sysdep order selection for soft-fp [25639] localedata: Some names of days and months wrongly spelt in Occitan [25657] libc: sigprocmask() and sigisemptyset() manipulate different amount of sigset_t bytes [25691] stdio: printf: memory leak when printing long multibyte strings [25715] libc: system() returns wrong errors when posix_spawn fails [25733] malloc: mallopt(M_MXFAST) can set global_max_fast to 0 [25734] locale: mbrtowc with Big5-HKSCS fails to reset conversion state for conversions that produce two Unicode code points [25765] nptl: Incorrect futex syscall in __pthread_disable_asynccancel for linux x86_64 leads to livelock [25788] dynamic-link: [i386] -fno-omit-frame-pointer in CFLAGS causes test failures, invalid instruction in ld.so [25790] glob: Typo in tst-fnmatch.input [25810] libc: x32: Incorrect syscall entries with pointer, off_t and size_t [25819] localedata: Update locale data to Unicode 13.0.0 [25824] libc: Abnormal function of strnlen in aarch64 [25887] dynamic-link: Wasted space in _dl_x86_feature_1[1] [25896] libc: Incorrect prctl [25902] libc: Bad LOADARGS_N [25905] dynamic-link: VSX registers are corrupted during PLT resolution when glibc is built with --disable-multi-arch and --with- cpu=power9 [25933] string: Off by one error in __strncmp_avx2 when length=VEC_SIZE*4 and strings are at page boundaries can cause a segfault [25942] nptl: Deadlock on stack_cache_lock between __nptl_setxid and exiting detached thread [25966] libc: Incorrect access of __x86_shared_non_temporal_threshold for x32 [25976] nss: internal_end*ent in nss_compat may clobber errno, hiding ERANGE [25999] nptl: Use-after-free issue in pthread_getaddr_default_np [26073] math: getpayload() has wrong return value [26076] dynamic-link: dlmopen crashes after failing to load dependencies in audit mode [26120] localedata: column width of of some Korean JUNGSEONG/JONGSEONG characters wrong (should be 0) [26128] libc: Incorrect bit_cpu_CLFLUSHOPT [26133] libc: Incorrect need_arch_feature_F16C [26137] libc: strtod() triggers exception FE_INEXACT on reasonable input [26149] libc: PKU is usable only if OSPKE is set [26173] libc: powerpc64*: Add @NOTOC to calls to functions that do not preserve r2 [26208] libc: Incorrect bit_cpu_CLFSH [26210] network: Incorrect use of hidden symbols for global sunrpc variables [26211] stdio: printf integer overflow calculating allocation size [26214] stdio: printf_fp double free [26215] stdio: printf_fp memory leak [26232] time: FAIL: support/tst-timespec for 32-bit targets [26258] nss: nss_compat should not read input files with mmap [26332] string: Incorrect cache line size load causes memory corruption in memset Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.32 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Alan Modra Alex Butler Alexander Anisimov Alistair Francis Andrea Corallo Andreas K. Hüttel Andreas Schwab Anton Blanchard Anton Blanchard via Libc-alpha Arjun Shankar Aurelien Jarno Aurélien Aptel Carlos O'Donell Chung-Lin Tang DJ Delorie David Kilroy Evgeny Eremin Eyal Itkin Fangrui Song Florian Weimer Gabriel F. T. Gomes Girish Joshi H.J. Lu John David Anglin John Marshall Jonathan Wakely Joseph Myers Josh Triplett Jwtiyar Nariman Krzysztof Koch Lexi Shao Lucas A. M. Magalhaes Lukasz Majewski Maciej W. Rozycki Martin Sebor Matheus Castanho Mathieu Desnoyers Michael Hudson-Doyle Mike FABIAN Patsy Franklin Paul E. Murphy Paul Eggert Paul Zimmermann Petr Vorel Rafał Lużyński Rajalakshmi Srinivasaraghavan Raphael Moreira Zinsly Rogerio Alves Samuel Thibault Sergey Shen-Ta Hsieh Siddhesh Poyarekar Simon Marchi Stefan Liebler Sudakshina Das Sunil K Pandey Szabolcs Nagy Tulio Magno Quites Machado Filho Vineet Gupta WANG Xuerui Wilco Dijkstra guojinhui kokoye2007 mayshao mayshao-oc
The GNU C Library ================= The GNU C Library version 2.31 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.31 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.31 ===================== Major new features: * The GNU C Library now supports a feature test macro _ISOC2X_SOURCE to enable features from the draft ISO C2X standard. Only some features from this draft standard are supported by the GNU C Library, and as the draft is under active development, the set of features enabled by this macro is liable to change. Features from C2X are also enabled by _GNU_SOURCE, or by compiling with "gcc -std=gnu2x". * The <math.h> functions that round their results to a narrower type now have corresponding type-generic macros in <tgmath.h>, as defined in TS 18661-1:2014 and TS 18661-3:2015 as amended by the resolution of Clarification Request 13 to TS 18661-3. * The function pthread_clockjoin_np has been added, enabling join with a terminated thread with a specific clock. It allows waiting against CLOCK_MONOTONIC and CLOCK_REALTIME. This function is a GNU extension. * New locale added: mnw_MM (Mon language spoken in Myanmar). * The DNS stub resolver will optionally send the AD (authenticated data) bit in queries if the trust-ad option is set via the options directive in /etc/resolv.conf (or if RES_TRUSTAD is set in _res.options). In this mode, the AD bit, as provided by the name server, is available to applications which call res_search and related functions. In the default mode, the AD bit is not set in queries, and it is automatically cleared in responses, indicating a lack of DNSSEC validation. (Therefore, the name servers and the network path to them are treated as untrusted.) Deprecated and removed features, and other changes affecting compatibility: * The totalorder and totalordermag functions, and the corresponding functions for other floating-point types, now take pointer arguments to avoid signaling NaNs possibly being converted to quiet NaNs in argument passing. This is in accordance with the resolution of Clarification Request 25 to TS 18661-1, as applied for C2X. Existing binaries that pass floating-point arguments directly will continue to work. * The obsolete function stime is no longer available to newly linked binaries, and its declaration has been removed from <time.h>. Programs that set the system time should use clock_settime instead. * We plan to remove the obsolete function ftime, and the header <sys/timeb.h>, in a future version of glibc. In this release, the header still exists but calling ftime will cause a compiler warning. All programs should use gettimeofday or clock_gettime instead. * The gettimeofday function no longer reports information about a system-wide time zone. This 4.2-BSD-era feature has been deprecated for many years, as it cannot handle the full complexity of the world's timezones, but hitherto we have supported it on a best-effort basis. Changes required to support 64-bit time_t on 32-bit architectures have made this no longer practical. As of this release, callers of gettimeofday with a non-null 'tzp' argument should expect to receive a 'struct timezone' whose tz_minuteswest and tz_dsttime fields are zero. (For efficiency reasons, this does not always happen on a few Linux-based ports. This will be corrected in a future release.) All callers should supply a null pointer for the 'tzp' argument to gettimeofday. For accurate information about the time zone associated with the current time, use the localtime function. gettimeofday itself is obsolescent according to POSIX. We have no plans to remove access to this function, but portable programs should consider using clock_gettime instead. * The settimeofday function can still be used to set a system-wide time zone when the operating system supports it. This is because the Linux kernel reused the API, on some architectures, to describe a system-wide time-zone-like offset between the software clock maintained by the kernel, and the "RTC" clock that keeps time when the system is shut down. However, to reduce the odds of this offset being set by accident, settimeofday can no longer be used to set the time and the offset simultaneously. If both of its two arguments are non-null, the call will fail (setting errno to EINVAL). Callers attempting to set this offset should also be prepared for the call to fail and set errno to ENOSYS; this already happens on the Hurd and on some Linux architectures. The Linux kernel maintainers are discussing a more principled replacement for the reused API. After a replacement becomes available, we will change settimeofday to fail with ENOSYS on all platforms when its 'tzp' argument is not a null pointer. settimeofday itself is obsolescent according to POSIX. Programs that set the system time should use clock_settime and/or the adjtime family of functions instead. We may cease to make settimeofday available to newly linked binaries after there is a replacement for Linux's time-zone-like offset API. * SPARC ISA v7 is no longer supported. v8 is still supported, but only if the optional CAS instruction is implemented (for instance, LEON processors are still supported, but SuperSPARC processors are not). As the oldest 64-bit SPARC ISA is v9, this only affects 32-bit configurations. * If a lazy binding failure happens during dlopen, during the execution of an ELF constructor, the process is now terminated. Previously, the dynamic loader would return NULL from dlopen, with the lazy binding error captured in a dlerror message. In general, this is unsafe because resetting the stack in an arbitrary function call is not possible. * For MIPS hard-float ABIs, the GNU C Library will be configured to need an executable stack unless explicitly configured at build time to require minimum kernel version 4.8 or newer. This is because executing floating-point branches on a non-executable stack on Linux kernels prior to 4.8 can lead to application crashes for some MIPS configurations. While currently PT_GNU_STACK is not widely used on MIPS, future releases of GCC are expected to enable non-executable stack by default with PT_GNU_STACK by default and is thus likely to trigger a crash on older kernels. The GNU C Library can be built with --enable-kernel=4.8.0 in order to keep a non-executable stack while dropping support for older kernels. * System call wrappers for time system calls now use the new time64 system calls when available. On 32-bit targets, these wrappers attempt to call the new system calls first and fall back to the older 32-bit time system calls if they are not present. This may cause issues in environments that cannot handle unsupported system calls gracefully by returning -ENOSYS. Seccomp sandboxes are affected by this issue. Changes to build and runtime requirements: * It is no longer necessary to have recent Linux kernel headers to build working (non-stub) system call wrappers on all architectures except 64-bit RISC-V. 64-bit RISC-V requires a minimum kernel headers version of 5.0. * The ChangeLog file is no longer present in the toplevel directory of the source tree. ChangeLog files are located in the ChangeLog.old directory as ChangeLog.N where the highest N has the latest entries. Security related changes: CVE-2019-19126: ld.so failed to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local attackers to restrict the possible mapping addresses for loaded libraries and thus bypass ASLR for a setuid program. Reported by Marcin Kościelnicki. The following bugs are resolved with this release: [12031] localedata: iconv -t ascii//translit with Greek characters [15813] libc: Multiple issues in __gen_tempname [17726] libc: [arm, sparc] profil_counter should be compat symbol [18231] libc: ipc_perm struct's mode member has wrong type in sys/ipc.h [19767] libc: vdso is not used with static linking [19903] hurd: Shared mappings not being inherited by children processes [20358] network: RES_USE_DNSSEC sets DO; should also have a way to set AD [20839] dynamic-link: Incomplete rollback of dynamic linker state on linking failure [23132] localedata: Missing transliterations in Miscellaneous Mathematical Symbols-A/B Unicode blocks [23518] libc: Eliminate __libc_utmp_jump_table [24026] malloc: malloc_info() returns wrong numbers [24054] localedata: Many locales are missing date_fmt [24214] dynamic-link: user defined ifunc resolvers may run in ldd mode [24304] dynamic-link: Lazy binding failure during ELF constructors/destructors is not fatal [24376] libc: RISC-V symbol size confusion with _start [24682] localedata: zh_CN first weekday should be Monday per GB/T 7408-2005 [24824] libc: test-in-container does not install charmap files compatible with localedef [24844] regex: regex bad pointer / leakage if malloc fails [24867] malloc: Unintended malloc_info formatting changes [24879] libc: login: utmp alarm timer can arrive after lock acquisition [24880] libc: login: utmp implementation uses struct flock with fcntl64 [24882] libc: login: pututline uses potentially outdated cache [24899] libc: Missing nonstring attributes in <utmp.h>, <utmpx.h> [24902] libc: login: Repeating pututxline on EINTR/EAGAIN causes stale utmp entries [24916] dynamic-link: [MIPS] Highest EI_ABIVERSION value not raised to ABSOLUTE ABI [24930] dynamic-link: dlopen of PIE executable can result in _dl_allocate_tls_init assertion failure [24950] localedata: Top-of-tree glibc does not build with top-of-tree GCC (stringop-overflow error) [24959] time: librt IFUNC resolvers for clock_gettime and clock_* functions other can lead to crashes [24967] libc: jemalloc static linking causes runtime failure [24986] libc: alpha: new getegid, geteuid and getppid syscalls used unconditionally [25035] libc: sbrk() failure handled poorly in tunables_strdup [25087] dynamic-link: ldconfig mishandles unusual .dynstr placement [25097] libc: new -Warray-bounds with GCC 10 [25112] dynamic-link: dlopen must not make new objects accessible when it still can fail with an error [25139] localedata: Please add the new mnw_MM locale [25149] regex: Array bounds violation in proceed_next_node [25157] dynamic-link: Audit cookie for the dynamic loader is not initialized correctly [25189] libc: glibc's __glibc_has_include causes issues with clang -frewrite-includes [25194] malloc: malloc.c: do_set_mxfast incorrectly casts the mallopt value to an unsigned [25204] dynamic-link: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries (CVE-2019-19126) [25225] libc: ld.so fails to link on x86 if GCC defaults to -fcf- protection [25226] string: strstr: Invalid result if needle crosses page on s390-z15 ifunc variant. [25232] string: <string.h> does not enable const correctness for strchr et al. for Clang++ [25233] localedata: Consider "." as the thousands separator for sl_SI (Slovenian) [25241] nptl: __SIZEOF_PTHREAD_MUTEX_T defined twice for x86 [25251] build: Failure to run tests when CFLAGS contains -DNDEBUG. [25271] libc: undeclared identifier PTHREAD_MUTEX_DEFAULT when compiling with -std=c11 [25323] localedata: km_KH: d_t_fmt contains "m" instead of "%M" [25324] localedata: lv_LV: d_t_fmt contains suspicious words in the time part [25396] dynamic-link: Failing dlopen can leave behind dangling GL (dl_initfirst) link map pointer [25401] malloc: pvalloc must not have __attribute_alloc_size__ [25423] libc: Array overflow in backtrace on powerpc [25425] network: Missing call to __resolv_context_put in getaddrinfo.c:gethosts Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.31 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Alexandra Hájková Alistair Francis Andreas Schwab Andrew Eggenberger Arjun Shankar Aurelien Jarno Carlos O'Donell Chung-Lin Tang DJ Delorie Dmitry V. Levin Dragan Mladjenovic Egor Kobylkin Emilio Cobos Álvarez Emilio Pozuelo Monfort Feng Xue Florian Weimer Gabriel F. T. Gomes Gustavo Romero H.J. Lu Ian Kent James Clarke Jeremie Koenig John David Anglin Joseph Myers Kamlesh Kumar Krzysztof Koch Leandro Pereira Lucas A. M. Magalhaes Lukasz Majewski Marcin Kościelnicki Matheus Castanho Mihailo Stojanovic Mike Crowe Mike FABIAN Niklas Hambüchen Paul A. Clarke Paul Eggert Petr Vorel Rafal Luzynski Rafał Lużyński Rajalakshmi Srinivasaraghavan Raoni Fassina Firmino Richard Braun Samuel Thibault Sandra Loosemore Siddhesh Poyarekar Stefan Liebler Svante Signell Szabolcs Nagy Talachan Mon Thomas Schwinge Tim Rühsen Tulio Magno Quites Machado Filho Wilco Dijkstra Xuelei Zhang Zack Weinberg liqingqing
Move ChangeLog to ChangeLog.old/ChangeLog.19 We no longer maintain a manually-written ChangeLog file: <https://sourceware.org/ml/libc-alpha/2019-09/msg00333.html> <https://sourceware.org/ml/libc-alpha/2019-10/msg00131.html> Instead the release manager is expected to generate a ChangeLog-like file using scripts/gitlog_to_changelog.py. For further details, see commit f2144b7 ("Script to generate ChangeLog-like output from git log"). Reviewed-by: Carlos O'Donell <carlos@redhat.com>
The GNU C Library ================= The GNU C Library version 2.30 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2017. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.30 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.30 ===================== Major new features: * Unicode 12.1.0 Support: Character encoding, character type info, and transliteration tables are all updated to Unicode 12.1.0, using generator scripts contributed by Mike FABIAN (Red Hat). * The dynamic linker accepts the --preload argument to preload shared objects, in addition to the LD_PRELOAD environment variable. * The twalk_r function has been added. It is similar to the existing twalk function, but it passes an additional caller-supplied argument to the callback function. * On Linux, the getdents64, gettid, and tgkill functions have been added. * Minguo (Republic of China) calendar support has been added as an alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW, nan_TW, lzh_TW. * The entry for the new Japanese era has been added for ja_JP locale. * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc, pvalloc, memalign, and posix_memalign fail now with total object size larger than PTRDIFF_MAX. This is to avoid potential undefined behavior with pointer subtraction within the allocated object, where results might overflow the ptrdiff_t type. * The dynamic linker no longer refuses to load objects which reference versioned symbols whose implementation has moved to a different soname since the object has been linked. The old error message, symbol FUNCTION-NAME, version SYMBOL-VERSION not defined in file DSO-NAME with link time reference, is gone. * Add new POSIX-proposed pthread_cond_clockwait, pthread_mutex_clocklock, pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock and sem_clockwait functions. These behave similarly to their "timed" equivalents, but also accept a clockid_t parameter to determine which clock their timeout should be measured against. All functions allow waiting against CLOCK_MONOTONIC and CLOCK_REALTIME. The decision of which clock to be used is made at the time of the wait (unlike with pthread_condattr_setclock, which requires the clock choice at initialization time). * On AArch64 the GNU IFUNC resolver call ABI changed: old resolvers still work, new resolvers can use a second argument which can be extended in the future, currently it contains the AT_HWCAP2 value. Deprecated and removed features, and other changes affecting compatibility: * The copy_file_range function fails with ENOSYS if the kernel does not support the system call of the same name. Previously, user space emulation was performed, but its behavior did not match the kernel behavior, which was deemed too confusing. Applications which use the copy_file_range function can no longer rely on glibc to provide a fallback on kernels that do not support the copy_file_range system call, and if this function returns ENOSYS, they will need to use their own fallback. Support for copy_file_range for most architectures was added in version 4.5 of the mainline Linux kernel. * The functions clock_gettime, clock_getres, clock_settime, clock_getcpuclockid, clock_nanosleep were removed from the librt library for new applications (on architectures which had them). Instead, the definitions in libc will be used automatically, which have been available since glibc 2.17. * The obsolete and never-implemented XSI STREAMS header files <stropts.h> and <sys/stropts.h> have been removed. * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6 resolver flag (deprecated in glibc 2.25) have been removed. * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub resolver have been removed from <resolv.h>. * With --enable-bind-now, installed programs are now linked with the BIND_NOW flag. * Support for the PowerPC SPE ISA extension (powerpc-*-*gnuspe* configurations) has been removed, following the deprecation of this subarchitecture in version 8 of GCC, and its removal in version 9. * On 32-bit Arm, support for the port-based I/O emulation and the <sys/io.h> header have been removed. * The Linux-specific <sys/sysctl.h> header and the sysctl function have been deprecated and will be removed from a future version of glibc. Application should directly access /proc instead. For obtaining random bits, the getentropy function can be used. Changes to build and runtime requirements: * GCC 6.2 or later is required to build the GNU C Library. Older GCC versions and non-GNU compilers are still supported when compiling programs that use the GNU C Library. Security related changes: CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check size. For x86-64, memcmp on an object size larger than SSIZE_MAX has undefined behavior. On x32, the size_t argument may be passed in the lower 32 bits of the 64-bit RDX register with non-zero upper 32 bits. When it happened with the sign bit of RDX register set, memcmp gave the wrong result since it treated the size argument as zero. Reported by H.J. Lu. CVE-2019-9169: Attempted case-insensitive regular-expression match via proceed_next_node in posix/regexec.c leads to heap-based buffer over-read. Reported by Hongxu Chen. The following bugs are resolved with this release: [2872] locale: Transliteration Cyrillic -> ASCII fails [6399] libc: gettid() should have a wrapper [16573] malloc: mtrace hangs when MALLOC_TRACE is defined [16976] glob: fnmatch unbounded stack VLA for collating symbols [17396] localedata: globbing for locale by [[.collating-element.]] [18035] dynamic-link: pldd does no longer work, enters infinite loop [18465] malloc: memusagestat is built using system C library [18830] locale: iconv -c -f ascii with >buffer size worth of input before invalid input drops valid char [20188] nptl: libpthread IFUNC resolver for vfork can lead to crash [20568] locale: Segfault with wide characters and setlocale/fgetwc/UTF-8 [21897] localedata: Afar locales: Fix mon, abmon, and abday [22964] localedata: The Japanese Era name will be changed on May 1, 2019 [23352] malloc: __malloc_check_init still defined in public header malloc.h. [23403] nptl: Wrong alignment of TLS variables [23501] libc: nftw() doesn't return dangling symlink's inode [23733] malloc: Check the count before calling tcache_get() [23741] malloc: Missing __attribute_alloc_size__ in many allocation functions [23831] localedata: nl_NL missing LC_NUMERIC thousands_sep [23844] nptl: pthread_rwlock_trywrlock results in hang [23983] argparse: Missing compat versions of argp_failure and argp_error for long double = double [23984] libc: Missing compat versions of err.h and error.h functions for long double = double [23996] localedata: Dutch salutations [24040] libc: riscv64: unterminated call chain in __thread_start [24047] network: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid long timeouts [24051] stdio: puts and putchar ouput to _IO_stdout instead of stdout [24059] nss: nss_files: get_next_alias calls fgets_unlocked without checking for NULL. [24114] regex: regexec buffer read overrun in "grep -i '\(\(\)*.\)*\(\)\(\)\1'" [24122] libc: Segfaults if 0 returned from la_version [24153] stdio: Some input functions do not react to stdin assignment [24155] string: x32 memcmp can treat positive length as 0 (if sign bit in RDX is set) (CVE-2019-7309) [24161] nptl: __run_fork_handlers self-deadlocks in malloc/tst-mallocfork2 [24164] libc: Systemtap probes need to use "nr" constraint on 32-bit Arm, not the default "nor" [24166] dynamic-link: Dl_serinfo.dls_serpath[1] in dlfcn.h causes UBSAN false positives, change to modern flexible array [24180] nptl: pthread_mutex_trylock does not use the correct order of instructions while maintaining the robust mutex list due to missing compiler barriers. [24194] librt: Non-compatibility symbols for clock_gettime etc. cause unnecessary librt dependencies [24200] localedata: Revert first_weekday removal in en_IE locale [24211] nptl: Use-after-free in Systemtap probe in pthread_join [24215] nptl: pthread_timedjoin_np should be a cancellation point [24216] malloc: Check for large bin list corruption when inserting unsorted chunk [24228] stdio: old x86 applications that use legacy libio crash on exit [24231] dynamic-link: [sparc64] R_SPARC_H34 implementation falls through to R_SPARC_H44 [24293] localedata: Missing Minguo calendar support for TW locales [24296] localedata: Orthographic mistakes in 'day' and 'abday' sections in tt_RU (Tatar) locale [24307] localedata: Update locale data to Unicode 12.0.0 [24323] dynamic-link: dlopen should not be able open PIE objects [24335] build: "Obsolete types detected" with Linux 5.0 headers [24369] localedata: Orthographic mistakes in 'mon' and 'abmon' sections in tt_RU (Tatar) locale [24370] localedata: Add lang_name for tt_RU locale [24372] locale: Binary locale files are not architecture independent [24394] time: strptime %Ey mis-parses final year of era [24476] dynamic-link: __libc_freeres triggers bad free in libdl if dlerror was not used [24506] dynamic-link: FAIL: elf/tst-pldd with --enable-hardcoded-path-in- tests [24531] malloc: Malloc tunables give tcache assertion failures [24532] libc: conform/arpa/inet.h failures due to linux kernel 64-bit time_t changes [24535] localedata: Update locale data to Unicode 12.1.0 [24537] build: nptl/tst-eintr1 test case can hit task limits on some kernels and break testing [24544] build: elf/tst-pldd doesn't work if you install with a --prefix [24556] build: [GCC 9] error: ‘%s’ directive argument is null [-Werror=format-overflow=] [24570] libc: alpha: compat msgctl uses __IPC_64 [24584] locale: Data race in __wcsmbs_clone_conv [24588] stdio: Remove codecvt vtables from libio [24603] math: sysdeps/ieee754/dbl-64/branred.c is slow when compiled with -O3 -march=skylake [24614] localedata: nl_NL LC_MONETARY doesn't match CLDR 35 [24632] stdio: Old binaries which use freopen with default stdio handles crash [24640] libc: __ppc_get_timebase_freq() always return 0 when using static linked glibc [24652] localedata: szl_PL spelling correction [24695] nss: nss_db: calling getpwent after endpwent crashes [24696] nss: endgrent() clobbers errno=ERRNO for 'group: db files' entry in /etc/nsswitch.conf [24699] libc: mmap64 with very large offset broken on MIPS64 n32 [24740] libc: getdents64 type confusion [24741] dynamic-link: ld.so should not require that a versioned symbol is always implemented in the same library [24744] libc: Remove copy_file_range emulation [24757] malloc: memusagestat is linked against system libpthread [24794] libc: Partial test suite run builds corrupt test-in-container testroot Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.30 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adam Maris Adhemerval Zanella Alexandra Hájková Andreas K. Hüttel Andreas Schwab Anton Youdkevitch Aurelien Jarno Carlos O'Donell DJ Delorie Daniil Zhilin David Abdurachmanov David Newall Dmitry V. Levin Egor Kobylkin Felix Yan Feng Xue Florian Weimer Gabriel F. T. Gomes Grzegorz Kulik H.J. Lu Jan Kratochvil Jim Wilson Joseph Myers Maciej W. Rozycki Mao Han Mark Wielaard Matthew Malcomson Mike Crowe Mike FABIAN Mike Frysinger Mike Gerow PanderMusubi Patsy Franklin Paul A. Clarke Paul Clarke Paul Eggert Paul Pluzhnikov Rafal Luzynski Richard Henderson Samuel Thibault Siddhesh Poyarekar Stan Shebs Stefan Liebler Szabolcs Nagy TAMUKI Shoichi Tobias Klauser Tulio Magno Quites Machado Filho Uros Bizjak Vincent Chen Vineet Gupta Wilco Dijkstra Wolfram Sang Yann Droneaud Zack Weinberg mansayk marxin
The GNU C Library ================= The GNU C Library version 2.29 is now available. The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C11 and POSIX.1-2008. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library webpage is at http://www.gnu.org/software/libc/ Packages for the 2.29 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html NEWS for version 2.29 ==================== * The getcpu wrapper function has been added, which returns the currently used CPU and NUMA node. This function is Linux-specific. * A new convenience target has been added for distribution maintainers to build and install all locales as directories with files. The new target is run by issuing the following command in your build tree: 'make localedata/install-locale-files', with an optional DESTDIR to set the install root if you wish to install into a non-default configured location. * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf. * The reallocarray function is now declared under _DEFAULT_SOURCE, not just for _GNU_SOURCE, to match BSD environments. * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel indicates that it will abort the transaction prior to entering the kernel (PPC_FEATURE2_HTM_NOSC on hwcap2). On older kernels the transaction is suspended, and this caused some undefined side-effects issues by aborting transactions manually. Glibc avoided it by abort transactions manually on each syscall, but it lead to performance issues on newer kernels where the HTM state is saved and restore lazily (the state being saved even when the process actually does not use HTM). * The functions posix_spawn_file_actions_addchdir_np and posix_spawn_file_actions_addfchdir_np have been added, enabling posix_spawn and posix_spawnp to run the new process in a different directory. These functions are GNU extensions. The function posix_spawn_file_actions_addchdir_np is similar to the Solaris function of the same name. * The popen and system do not run atfork handlers anymore (BZ#17490). Although it is a possible POSIX violation, the POSIX rationale in pthread_atfork documentation regarding atfork handlers is to handle inconsistent mutex state after a fork call in a multi-threaded process. In both popen and system there is no direct access to user-defined mutexes. * Support for the C-SKY ABIV2 running on Linux has been added. This port requires at least binutils-2.32, gcc-9.0, and linux-4.20. Two ABIs are supported: - C-SKY ABIV2 soft-float little-endian - C-SKY ABIV2 hard-float little-endian * strftime's default formatting of a locale's alternative year (%Ey) has been changed to zero-pad the year to a minimum of two digits, like "%y". This improves the display of Japanese era years during the first nine years of a new era, and is expected to be harmless for all other locales (only Japanese locales regularly have alternative year numbers less than 10). Zero-padding can be overridden with the '_' or '-' flags (which are GNU extensions). * As a GNU extension, the '_' and '-' flags can now be applied to "%EY" to control how the year number is formatted; they have the same effect that they would on "%Ey". Deprecated and removed features, and other changes affecting compatibility: * The glibc.tune tunable namespace has been renamed to glibc.cpu and the tunable glibc.tune.cpu has been renamed to glibc.cpu.name. * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined in <sys/procfs.h>, has been corrected to match the type actually used by the Linux kernel. This affects the size and layout of that structure on MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V. * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo, defined in <sys/procfs.h>, has been corrected to match the type actually used by the Linux kernel. This affects the size and layout of those structures. * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]' meant to scan a string and allocate space for it with malloc, is now restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE defined. This extension conflicts with C99's use of '%a' to scan a hexadecimal floating-point number, which is now available to programs compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE. POSIX.1-2008 includes the feature of allocating a buffer for string input with malloc, using the modifier letter 'm' instead. Programs using '%as', '%aS', or '%a[...]' with the old GNU meaning should change to '%ms', '%mS', or '%m[...]' respectively. Programs that wish to use the C99 '%a' no longer need to avoid _GNU_SOURCE. GCC's -Wformat warnings can detect most uses of this extension, as long as all functions that call vscanf, vfscanf, or vsscanf are annotated with __attribute__ ((format (scanf, ...))). Changes to build and runtime requirements: * Python 3.4 or later is required to build the GNU C Library. * On most architectures, GCC 5 or later is required to build the GNU C Library. (On powerpc64le, GCC 6.2 or later is still required, as before.) Older GCC versions and non-GNU compilers are still supported when compiling programs that use the GNU C Library. Security related changes: CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a denial of service due to resource exhaustion when processing getaddrinfo calls with crafted host names. Reported by Guido Vranken. CVE-2019-6488: On x32, the size_t parameter may be passed in the lower 32 bits of a 64-bit register with with non-zero upper 32 bit. When it happened, accessing the 32-bit size_t value as the full 64-bit register in the assembly string/memory functions would cause a buffer overflow. Reported by H.J. Lu. CVE-2016-10739: The getaddrinfo function could successfully parse IPv4 addresses with arbitrary trailing characters, potentially leading to data or command injection issues in applications. Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.29 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adhemerval Zanella Albert ARIBAUD (3ADEV) Alexandra Hájková Andreas K. Hüttel Andreas Schwab Anton Youdkevitch Arjun Shankar Assaf Gordon Aurelien Jarno Carlos O'Donell Charles-Antoine Couret DJ Delorie Darius Rad David S. Miller Dmitry V. Levin Florian Weimer Fredrik Noring Gabriel F. T. Gomes H.J. Lu Ilya Leoshkevich Ilya Yu. Malakhov Istvan Kurucsai Jim Wilson Joseph Myers Justus Winter Kemi Wang Leonardo Sandoval Mao Han Martin Jansa Martin Kuchta Martin Sebor Mingli Yu Moritz Eckert PanderMusubi Paul Clarke Paul Eggert Paul Pluzhnikov Pochang Chen Rafael Avila de Espindola Rafael Ávila de Espíndola Rafal Luzynski Rajalakshmi Srinivasaraghavan Rogerio Alves Samuel Thibault Sergi Almacellas Abellana Siddhesh Poyarekar Stefan Liebler Steve Ellcey Szabolcs Nagy TAMUKI Shoichi Tobias Klauser Tulio Magno Quites Machado Filho Uroš Bizjak Wilco Dijkstra Zack Weinberg Zong Li
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