Your message dated Fri, 27 Mar 2026 21:18:58 +0000
with message-id <[email protected]>
and subject line Bug#1129746: fixed in glibc 2.42-14
has caused the Debian Bug report #1129746,
regarding glibc is not built with -fstack-clash-protection (despite it being in
dpkg-buildflags)
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1129746: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1129746
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: libc6
Version: 2.42-13
My understanding is that dpkg-buildflags defaults include
-fstack-clash-protection (see
https://git.dpkg.org/cgit/dpkg/dpkg.git/commit/?id=11efff1bf), but
somehow Debian's glibc appears to not be built with
-fstack-clash-protection; there are unprotected large stack
allocations in functions like ____strtold_l_internal,
____strtof128_l_internal, tempnam, tmpfile64, and more:
$ wget http://ftp.ch.debian.org/debian/pool/main/g/glibc/libc6_2.42-13_amd64.deb
[...]
$ ar x libc6_2.42-13_amd64.deb
$ tar xf data.tar.xz
$ objdump -d usr/lib/x86_64-linux-gnu/libc.so.6 | egrep 'sub
*\$0x.{4,},%rsp' | grep -v 0xffffff
51763: 48 81 ec 48 36 00 00 sub $0x3648,%rsp
573c2: 48 81 ec 88 36 00 00 sub $0x3688,%rsp
611ca: 48 81 ec 10 10 00 00 sub $0x1010,%rsp
617a3: 48 81 ec 28 10 00 00 sub $0x1028,%rsp
a14f1: 48 81 ec b8 11 00 00 sub $0x11b8,%rsp
adeef: 48 81 ec 10 40 00 00 sub $0x4010,%rsp
adf11: 48 81 ec 10 10 00 00 sub $0x1010,%rsp
c8de0: 48 81 ec 58 36 00 00 sub $0x3658,%rsp
cb762: 48 81 ec 10 40 00 00 sub $0x4010,%rsp
cb775: 48 81 ec 10 10 00 00 sub $0x1010,%rsp
cde80: 48 81 ec 88 36 00 00 sub $0x3688,%rsp
e21ed: 48 81 ec d8 28 00 00 sub $0x28d8,%rsp
ea72d: 48 81 ec a8 15 00 00 sub $0x15a8,%rsp
f395e: 48 81 ec c8 48 00 00 sub $0x48c8,%rsp
106762: 48 81 ec 18 10 00 00 sub $0x1018,%rsp
10b160: 48 81 ec 18 10 00 00 sub $0x1018,%rsp
126a0b: 48 81 ec 00 10 00 00 sub $0x1000,%rsp
12d2ca: 48 81 ec 18 20 00 00 sub $0x2018,%rsp
14fb59: 48 81 ec c8 29 00 00 sub $0x29c8,%rsp
150d76: 48 81 ec 88 22 00 00 sub $0x2288,%rsp
161fee: 48 81 ec c0 11 00 00 sub $0x11c0,%rsp
162530: 48 81 ec 48 10 00 00 sub $0x1048,%rsp
Since glibc does not have stack clash protection, the stack clash
protection of any software that calls glibc functions with large stack
frames is also less effective.
Can you please also build glibc with -fstack-clash-protection?
--- End Message ---
--- Begin Message ---
Source: glibc
Source-Version: 2.42-14
Done: Aurelien Jarno <[email protected]>
We believe that the bug you reported is fixed in the latest version of
glibc, which is due to be installed in the Debian FTP archive.
A summary of the changes between this version and the previous one is
attached.
Thank you for reporting the bug, which will now be closed. If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.
Debian distribution maintenance software
pp.
Aurelien Jarno <[email protected]> (supplier of updated glibc package)
(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
Format: 1.8
Date: Fri, 27 Mar 2026 22:08:16 +0100
Source: glibc
Architecture: source
Version: 2.42-14
Distribution: unstable
Urgency: medium
Maintainer: GNU Libc Maintainers <[email protected]>
Changed-By: Aurelien Jarno <[email protected]>
Closes: 113887 1128631 1129746 1131435
Changes:
glibc (2.42-14) unstable; urgency=medium
.
[ Samuel Thibault ]
* debian/patches/hurd-i386/git-mach_send_eintr.diff: Fix assertion failure
on eintr during message send.
* debian/patches/hurd-i386/git-itimer-lock.diff: Fix setitimer mutex
inversion.
* debian/patches/hurd-i386/git-posix-timers.diff: Set _POSIX_TIMERS to
200809L. Closes: #1128631.
* debian/patches/hurd-i386/sig-alarm.diff: Fix it_interval in setitimer, thus
alarm too, on hurd-amd64.
* debian/patches/hurd-i386/git-libio-mtsafe.diff: Fix mt-safeness of libio.
* debian/patches/hurd-i386/git-cancel-sig.diff: Complete fix.
* debian/patches/hurd-i386/git-timedrwlock-unlock.diff: Fix race between
timedrd/wrlock and unlock.
* debian/patches/hurd-i386/git-sigtimedwait-timeout.diff: Fix cleaning on
sigtimedwait timing out.
* debian/testsuite-xfail-debian.mk: Update for 2.44.
.
[ Aurelien Jarno ]
* debian/sysdeps/mips*.mk: rename extra passes to matche the dpkg
architecture name.
* debian/rules.d/build.mk: add a makefile function that queries the dpkg
build flags for the current pass.
* debian/rules.d/build.mk: enable stack protection depending on
-fstack-protector* flags returned by dpkg-buildflags.
* debian/rules.d/build.mk: add a makefile function to filter out dpkg build
flags incompatible with glibc and define CFLAGS from dpkg build flags.
Closes: #1129746.
* debian/control.in/{libc,i386}: downgrade the libdpkg-dev break to the
trixie version now that bug#1122107 got fixed in trixie. Also apply it to
amd64 and x32, as they are also using symbol versions used as ABI flag.
Limit the break to libc6, multilib packages will get the break
transitively through the strict depends.
* debian/symbols.wildcards: adjust ABI flags version, we need to match the
first version where the flag got introduced, not the first version where
the fix got introduced.
* debian/patches/git-updates.diff: update from upstream stable branch:
- Fix a null pointer dereference in the nss_database_check_reload_and_get
function.
- Fix invalid pointer arithmetic in ANSI_X3.110 iconv module
- Fix a typo preventing new tst-wordexp-reuse-mem to run
- Fix incorrect handling of DNS responses in gethostbyaddr and
gethostbyaddr_r (CVE-2026-4437). Closes: #1131435.
- Fix invalid DNS hostnames returned by gethostbyaddr and
gethostbyaddr_r (CVE-2026-4438). Closes: #113887.
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3efa3fa699aca44bd9f78ea88a4d88c5518d0ccb 9572 glibc_2.42-14_source.buildinfo
Checksums-Sha256:
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Files:
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2a280cc4006ab5e99f72a5ba9d09e298 433760 libs required
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glibc_2.42-14_source.buildinfo
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