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glibc

The GNU C library.

Recent Activity

elf: Support vDSO with more than one PT_LOAD with v_addr starting at 0 (BZ 32583)
Adhemerval Zanella: The setup_vdso assumes that vDSO will contain only one PT_LOAD segment and that 0 is the sentinel for the start mapping address.

nptl: Make pthread_{clock, timed}join{_np} act on all cancellation (BZ 33717)
Adhemerval Zanella: The pthread_join/pthread_timedjoin_np/pthread_clockjoin_np will not act on cancellation if 1.

nptl: Do not use pthread set_tid_address as state synchronization (BZ #19951)
Adhemerval Zanella: The use-after-free described in BZ#19951 is due to the use of two different PD fields, 'joinid' and 'cancelhandling', to describe the thread state and to synchronise the calls of pthread_join, pthread_detach, pthread_exit, and normal thread exit. Any state change may require checking both fields atomically to handle partial state (e.g., pthread_join() with a cancellation handler to issue a 'joinstate' field rollback). This patch uses a different PD member with 4 possible states (JOINABLE, DETACHED, EXITING, and EXITED) instead of the pthread 'tid' field, with the following logic: 1.

nptl: Optimize trylock for high cache contention workloads (BZ #33704)
Sunil K Pandey: Check lock availability before acquisition to reduce cache line bouncing.

math: Fix potential underflow on ldbl-128 erfl
Adhemerval Zanella: The multiplication operation is required only if the branch is taken, and the compiler might not optimize it away.

Deprecate s390-linux-gnu (31bit)
Stefan Liebler: The next linux 6.19 release will remove support for compat syscalls on s390x with those commits:

malloc: Enable 2MB THP by default on Aarch64
Dev Jain: Add missing files from previous commit.

x32: Implement prctl in assembly
H.J. Lu: Since the variadic prctl function takes at most 5 integer arguments which are passed in the same integer registers on x32 as the function with 5 integer arguments, we can use assembly for prctl.

libio: null terminate the buffer upon initial allocation in getdelim
Collin Funk: Commit 33eff78c8b28adc4963987880e10d96761f2a167 caused issues in nbdkit which had code similar to this to get the last line of the file: while (getline (&line, &len, fp) != -1) ; /* Process LINE.

aarch64: Implement AdvSIMD and SVE rsqrt(f) routines
James Chesterman: Vector variants of the new C23 rsqrt routines for both AdvSIMD and SVE, as well as in both single and double precision.

glibc Release Tags

Check if linker supports -Wl,--undefined-version
Adhemerval Zanella: Although binutils has supported --no-undefined-version for a long timei (319416359200 back in 2002), --undefined-version was only added more recently (27fb6a1a7fcd on 2.40).

Create ChangeLog.old/ChangeLog.31
Andreas K. Hüttel

Increase version to 2.41.9000, add new section to NEWS
Andreas K. Hüttel: ### diff --git a/NEWS b/NEWS index b11422b060..e2e40e141c 100644 --- a/NEWS +++ b/NEWS @@ -5,6 +5,33 @@ See the end for copying conditions. Please send GNU C library bug reports via <

Create ChangeLog.old/ChangeLog.30
Andreas K. Hüttel

Increase version number to 2.40.9000
Andreas K. Hüttel

Add ChangeLog file
Andreas K. Hüttel

Open master branch for glibc 2.39 development
Andreas K. Hüttel

NEWS: Fix typos
Andreas K. Hüttel

Open master branch for glibc 2.38 development
Carlos O'Donell

Create ChangeLog.old/ChangeLog.26.
Carlos O'Donell

Most Popular In The Past Month

libio: null terminate the buffer upon initial allocation in getdelim
Collin Funk: Commit 33eff78c8b28adc4963987880e10d96761f2a167 caused issues in nbdkit which had code similar to this to get the last line of the file: while (getline (&line, &len, fp) != -1) ; /* Process LINE.

x32: Implement prctl in assembly
H.J. Lu: Since the variadic prctl function takes at most 5 integer arguments which are passed in the same integer registers on x32 as the function with 5 integer arguments, we can use assembly for prctl.

malloc: Enable 2MB THP by default on Aarch64
Dev Jain: Add missing files from previous commit.

nptl: Make pthread_{clock, timed}join{_np} act on all cancellation (BZ 33717)
Adhemerval Zanella: The pthread_join/pthread_timedjoin_np/pthread_clockjoin_np will not act on cancellation if 1.

elf: Support vDSO with more than one PT_LOAD with v_addr starting at 0 (BZ 32583)
Adhemerval Zanella: The setup_vdso assumes that vDSO will contain only one PT_LOAD segment and that 0 is the sentinel for the start mapping address.

math: Fix potential underflow on ldbl-128 erfl
Adhemerval Zanella: The multiplication operation is required only if the branch is taken, and the compiler might not optimize it away.

Deprecate s390-linux-gnu (31bit)
Stefan Liebler: The next linux 6.19 release will remove support for compat syscalls on s390x with those commits:

nptl: Optimize trylock for high cache contention workloads (BZ #33704)
Sunil K Pandey: Check lock availability before acquisition to reduce cache line bouncing.

nptl: Do not use pthread set_tid_address as state synchronization (BZ #19951)
Adhemerval Zanella: The use-after-free described in BZ#19951 is due to the use of two different PD fields, 'joinid' and 'cancelhandling', to describe the thread state and to synchronise the calls of pthread_join, pthread_detach, pthread_exit, and normal thread exit. Any state change may require checking both fields atomically to handle partial state (e.g., pthread_join() with a cancellation handler to issue a 'joinstate' field rollback). This patch uses a different PD member with 4 possible states (JOINABLE, DETACHED, EXITING, and EXITED) instead of the pthread 'tid' field, with the following logic: 1.

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