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* The GNU C Library version 2.30 is now available
@ 2019-08-01 20:13 Carlos O'Donell
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From: Carlos O'Donell @ 2019-08-01 20:13 UTC (permalink / raw)
  To: libc-announce

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

Packages for the 2.30 release may be downloaded from:

The mirror list is at

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
   [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
   [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
   [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-
   [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
   [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
   [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: 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

Release Notes


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 Frysinger
Mike Gerow
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


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