Your message dated Tue, 25 Feb 2025 12:07:01 +0000
with message-id <[email protected]>
and subject line Bug#1098694: fixed in util-linux 2.40.4-5
has caused the Debian Bug report #1098694,
regarding Crash in agetty due to invalid strncmp call in Trixie
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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--
1098694: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1098694
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: util-linux
Version: 2.40.4-3
Severity: important
Dear Maintainer,
this is the first bug report I'm sending, so I hope all the formatting
is correct.
I am running Debian Trixie in a Proxmox VM. I noticed that on the login
screen there are errors of agetty crashing with a segfault. There's
nothing special about the VM, it's a blank VM running the daily cloud
images of Debian Trixie.
The VM is running Linux 6.12.12-1 with util-linux 2.40.4-3 and libc6
2.40-7.
I debugged this with ltrace and believe I found the error, or at least
some invalid behaviour.
In agetty.c in the debian sources for util-linux, right at the end of
the function parse_args, there's code that tries to figure out the
terminal name using a call to get_terminal_name. For some reason, this
function call seems to fail on my machine and it prints the error "could
not get terminal name".
This causes it to set &op->tty to NULL, and unfortunately, a couple
lines later, that variable is used in a strncmp call, causing it to crash.
Here's the corresponding lines from the ltrace log:
strtok(nil, ",") = nil
free(0x557c64154be0) = <void>
strcmp("-", "-") = 0
isatty(0) = 0
isatty(1) = 0
isatty(2) = 0
dcgettext(nil, "could not get terminal name: %d", 5) = "could not get
terminal name: %d"
openlog("agetty", 1, 80) = <void>
__vsyslog_chk(4, 1, 0x557c2a49d4d8, 0x7ffda1325e40) = 0
closelog() = <void>
strncmp(nil, "tty", 3 <no return ...>
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++
I can provide the full ltrace log and/or a crash dump file if necessary
- what's the best way to provide these? Upload at a filehoster and send
the link in response to this bug report?
Unfortunately, I was not yet able to figure out why on my machine the
code seems to run into this code path with the "could not get terminal
name" warning. But nevertheless, it's a valid code path, and it's just a
warning not an error, so the code that comes after it should be able to
handle this without crashing.
Best regards,
Florian
--- End Message ---
--- Begin Message ---
Source: util-linux
Source-Version: 2.40.4-5
Done: Chris Hofstaedtler <[email protected]>
We believe that the bug you reported is fixed in the latest version of
util-linux, 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.
Chris Hofstaedtler <[email protected]> (supplier of updated util-linux 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: Tue, 25 Feb 2025 11:34:50 +0100
Source: util-linux
Architecture: source
Version: 2.40.4-5
Distribution: unstable
Urgency: medium
Maintainer: util-linux packagers <[email protected]>
Changed-By: Chris Hofstaedtler <[email protected]>
Closes: 1098694
Changes:
util-linux (2.40.4-5) unstable; urgency=medium
.
* Apply upstream patch to avoid agetty crash (Closes: #1098694)
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