GNU C Library - News: The GNU C Library version 2.36 is now available

The GNU C Library version 2.36 is now available

Item posted by Carlos O'Donell <codonell> on Tue 02 Aug 2022 01:17:34 AM UTC.

The GNU C Library
=================

The GNU C Library version 2.36 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 2.36 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 2.36
=====================

Major new features:

• Support for DT_RELR relative relocation format has been added to

  glibc.  This is a new ELF dynamic tag that improves the size of
  relative relocations in shared object files and position independent
  executables (PIE).  DT_RELR generation requires linker support for
  -z pack-relative-relocs option, which is supported for some targets
  in recent binutils versions.  Lazy binding doesn't apply to DT_RELR.

• On Linux, the pidfd_open, pidfd_getfd, and pidfd_send_signal functions

  have been added.  The pidfd functionality provides access to a process
  while avoiding the issue of PID reuse on tranditional Unix systems.

• On Linux, the process_madvise function has been added. It has the

  same functionality as madvise but alters the target process identified
  by the pidfd.

• On Linux, the process_mrelease function has been added.  It allows a

  caller to release the memory of a dying process.  The release of the
  memory is carried out in the context of the caller, using the caller's
  CPU affinity, and priority with CPU usage accounted to the caller.

• The “no-aaaa” DNS stub resolver option has been added.  System

  administrators can use it to suppress AAAA queries made by the stub
  resolver, including AAAA lookups triggered by NSS-based interfaces
  such as getaddrinfo.  Only DNS lookups are affected: IPv6 data in
  /etc/hosts is still used, getaddrinfo with AI_PASSIVE will still
  produce IPv6 addresses, and configured IPv6 name servers are still
  used.  To produce correct Name Error (NXDOMAIN) results, AAAA queries
  are translated to A queries.  The new resolver option is intended
  primarily for diagnostic purposes, to rule out that AAAA DNS queries
  have adverse impact.  It is incompatible with EDNS0 usage and DNSSEC
  validation by applications.

• On Linux, the fsopen, fsmount, move_mount, fsconfig, fspick, open_tree,

  and mount_setattr have been added.  They are part of the new Linux kernel
  mount APIs that allow applications to more flexibly configure and operate
  on filesystem mounts.  The new mount APIs are specifically designed to work
  with namespaces.

• localedef now accepts locale definition files encoded in UTF-8.

  Previously, input bytes not within the ASCII range resulted in
  unpredictable output.

• Support for the mbrtoc8 and c8rtomb multibyte/UTF-8 character conversion

  functions has been added per the ISO C2X N2653 and C++20 P0482R6 proposals.
  Support for the char8_t typedef has been added per the ISO C2X N2653
  proposal.  The functions are declared in uchar.h in C2X mode or when the
  _GNU_SOURCE macro or C++20 __cpp_char8_t feature test macro is defined.
  The char8_t typedef is declared in uchar.h in C2X mode or when the
  _GNU_SOURCE macro is defined and the C++20 __cpp_char8_t feature test macro
  is not defined (if __cpp_char8_t is defined, then char8_t is a builtin type).

• The functions arc4random, arc4random_buf, and arc4random_uniform have been

  added.  The functions wrap getrandom and/or /dev/urandom to return high-
  quality randomness from the kernel.

• Support for LoongArch running on Linux has been added.  This port requires

  as least binutils 2.38, GCC 12, and Linux 5.19.  Currently only hard-float
  ABI is supported:

    - loongarch64-linux-gnu

  The LoongArch ABI is 64-bit little-endian.

Deprecated and removed features, and other changes affecting compatibility:

• Support for prelink will be removed in the next release; this includes

  removal of the LD_TRACE_PRELINKING, and LD_USE_LOAD_BIAS, environment
  variables and their functionality in the dynamic loader.

• The Linux kernel version check has been removed along with the

  LD_ASSUME_KERNEL environment variable.  The minimum kernel used to built
  glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed
  when libc.so is issued directly.

• On Linux, The LD_LIBRARY_VERSION environment variable has been removed.

The following bugs are resolved with this release:

  [14932] dynamic-link: dlsym(handle, "foo") and dlsym(RTLD_NEXT, "foo")
    return different result with versioned "foo"
  [16355] libc: syslog.h's SYSLOG_NAMES namespace violation and utter
    mess
  [23293] dynamic-link: aarch64: getauxval is broken when run as ld.so
    ./exe and ld.so adjusts argv on the stack
  [24595] nptl: [2.28 Regression]: Deadlock in atfork handler which
    calls dlclose
  [25744] locale: mbrtowc with Big5-HKSCS returns 2 instead of 1 when
    consuming the second byte of certain double byte characters
  [25812] stdio: Libio vtable protection is sometimes only partially
    enforced
  [27054] libc: pthread_atfork handlers that call pthread_atfork
    deadlock
  [27924] dynamic-link: ld.so: Support DT_RELR relative relocation
    format
  [28128] build: declare_symbol_alias doesn't work for assembly codes
  [28566] network: getnameinfo with NI_NOFQDN is not thread safe
  [28752] nss: Segfault in getpwuid when stat fails
  [28815] libc: realpath should not copy to resolved buffer on error
  [28828] stdio: fputwc crashes
  [28838] libc: FAIL: elf/tst-p_align3
  [28845] locale: ld-monetary.c should be updated to match ISO C and
    other standards.
  [28850] libc: linux: __get_nprocs_sched reads uninitialized memory
    from the stack
  [28852] libc: getaddrinfo leaks memory with AI_ALL
  [28853] libc: tst-spawn6 changes current foreground process group
    (breaks test isolation)
  [28857] libc: FAIL: elf/tst-audit24a
  [28860] build: --enable-kernel=5.1.0 build fails because of missing
    __convert_scm_timestamps
  [28865] libc: linux: _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN are
    inaccurate without /sys and /proc
  [28868] dynamic-link: Dynamic loader DFS algorithm segfaults on
    missing libraries
  [28880] libc: Program crashes if date beyone 2038
  [28883] libc: sysdeps/unix/sysv/linux/select.c: __select64
    !__ASSUME_TIME64_SYSCALLS && !__ASSUME_PSELECT fails on Microblaze
  [28896] string: strncmp-avx2-rtm and wcsncmp-avx2-rtm fallback on non-
    rtm variants when avoiding overflow
  [28922] build: The .d dependency files aren't always generated
  [28931] libc: hosts lookup broken for SUCCESS=CONTINUE and
    SUCCESS=MERGE
  [28936] build: nm: No such file
  [28950] localedata: Add locale for ISO code "tok" (Toki Pona)
  [28953] nss: NSS lookup result can be incorrect if function lookup
    clobbers errno
  [28970] math: benchtest: libmvec benchmark doesn't build with make
    bench.
  [28991] libc: sysconf(_SC_NPROCESSORS_CONF) should read
    /sys/devices/system/cpu/possible
  [28993] libc: closefrom() iterates until max int if no access to
    /proc/self/fd/
  [28996] libc: realpath fails to copy partial result to resolved buffer
    on ENOENT and EACCES
  [29027] math: [ia64] fabs fails with sNAN input
  [29029] nptl: poll() spuriously returns EINTR during thread
    cancellation and with cancellation disabled
  [29030] string: GLIBC 2.35 regression - Fortify crash on certain valid
    uses of mbsrtowcs (* buffer overflow detected *: terminated)
  [29062] dynamic-link: Memory leak in _dl_find_object_update if object
    is promoted to global scope
  [29069] libc: fstatat64_time64_statx wrapper broken on MIPS N32 with
    -D_FILE_OFFSET_BITS=64 and -D_TIME_BITS=64
  [29071] dynamic-link: m68k: Removal of ELF_DURING_STARTUP optimization
    broke ld.so
  [29097] time: fchmodat does not handle 64 bit time_t for
    AT_SYMLINK_NOFOLLOW
  [29109] libc: posix_spawn() always returns 1 (EPERM) on clone()
    failure
  [29141] libc: _FORTIFY_SOURCE=3 fail for gcc 12/glibc 2.35
  [29162] string: [PATCH] string.h syntactic error:
    include/bits/string_fortified.h:110: error: expected ',' or ';'
    before '__fortified_attr_access'
  [29165] libc: [Regression] broken argv adjustment
  [29187] dynamic-link: [regression] broken argv adjustment for nios2
  [29193] math: sincos produces a different output than sin/cos
  [29197] string: __strncpy_power9() uses uninitialised register vs18
    value for filling after \0
  [29203] libc: daemon is not y2038 aware
  [29204] libc: getusershell is not 2038 aware
  [29207] libc: posix_fallocate fallback implementation is not y2038
    aware
  [29208] libc: fpathconf(_PC_ASYNC_IO) is not y2038 aware
  [29209] libc: isfdtype is not y2038 aware
  [29210] network: ruserpass is not y2038 aware
  [29211] libc: __open_catalog is not y2038 aware
  [29213] libc: gconv_parseconfdir is not y2038 aware
  [29214] nptl: pthread_setcanceltype fails to set type
  [29225] network: Mistyped define statement in socket/sys/socket.h in
    line 184
  [29274] nptl: __read_chk is not a cancellation point
  [29279] libc: undefined reference to `mbstowcs_chk' after
    464d189b9622932a75302290625de84931656ec0
  [29304] libc: mq_timedreceive does not handle 64 bit syscall return
    correct for !__ASSUME_TIME64_SYSCALLS
  [29403] libc: st_atim, st_mtim, st_ctim stat struct members are
    missing on microblaze with largefile

Release Notes
=============

https://sourceware.org/glibc/wiki/Release/2.36

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:

=Joshua Kinard
Adhemerval Zanella
Adhemerval Zanella Netto
Alan Modra
Andreas Schwab
Arjun Shankar
Arnout Vandecappelle (Essensium/Mind)
Carlos O'Donell
Cristian Rodríguez
DJ Delorie
Danila Kutenin
Darius Rad
Dmitriy Fedchenko
Dmitry V. Levin
Emil Soleyman-Zomalan
Fangrui Song
Florian Weimer
Gleb Fotengauer-Malinovskiy
Guilherme Janczak
H.J. Lu
Ilyahoo Proshel
Jason A. Donenfeld
Joan Bruguera
John David Anglin
Jonathan Wakely
Joseph Myers
José Bollo
Kito Cheng
Maciej W. Rozycki
Mark Wielaard
Matheus Castanho
Max Gautier
Michael Hudson-Doyle
Nicholas Guriev
Noah Goldstein
Paul E. Murphy
Raghuveer Devulapalli
Ricardo Bittencourt
Sam James
Samuel Thibault
Sergei Trofimovich
Siddhesh Poyarekar
Stafford Horne
Stefan Liebler
Steve Grubb
Su Lifan
Sunil K Pandey
Szabolcs Nagy
Tejas Belagod
Tom Coldrick
Tom Honermann
Tulio Magno Quites Machado Filho
WANG Xuerui
Wangyang Guo
Wilco Dijkstra
Xi Ruoyao
Xiaoming Ni
Yang Yanchao
caiyinyu