Author: Michael G

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

  [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

If you look around Google’s Mountain View, CA offices, you’ll see Windows machines, Chromebooks, Macs — and gLinux desktops. G what, you ask? Well, in addition to  relying on Linux for its servers, Google has its very own Linux desktop distribution. You can’t get it — darn it! — but for more than a decade, Google has been baking and eating its own homemade Linux desktop distribution. The first version was Goobuntu. It’s not news that Google has it’s own in-house desktop Linux distribution, but this article provides some interesting insights into some of its unique aspects. The latest versions now use a rolling release model based on Debian, with a custom automated package building and testing tool on top, developed by Google. I’d love to see it in action and have it released to the public.