This bug was fixed in the package autofs - 5.1.9-1ubuntu4
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autofs (5.1.9-1ubuntu4) noble; urgency=medium
* d/p/adjust-buffer-size-for-snprintf.patch: fix buffer size when
appending to a string (LP: #2061667)
-- Andreas Hasenack Wed, 17 Apr 2024 11:47:05
-0300
** Changed
This was uploaded and is in noble-unapproved.
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https://bugs.launchpad.net/bugs/2061667
Title:
Noble 'autofs' 5.1.9-1ubuntu3 buffer overflow
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Thanks for verifying it. This is up for review and as soon as it's
approved I'll upload.
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https://bugs.launchpad.net/bugs/2061667
Title:
Noble 'autofs' 5.1.9-1ubuntu3 buffer overflow
«In the meantime, you can also try debuginfod»
Interesting, thanks for mentioning this.
«reproduce it finally after I added "strictexpire" to /etc/auto.master»
That is really weird, I think I was not using that (or "ignore").
Your intuition that was a factor seems to have worked because:
«PPA
** Merge proposal linked:
https://code.launchpad.net/~ahasenack/ubuntu/+source/autofs/+git/autofs/+merge/464560
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https://bugs.launchpad.net/bugs/2061667
Title:
Noble 'autofs'
** Tags added: server-todo
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https://bugs.launchpad.net/bugs/2061667
Title:
Noble 'autofs' 5.1.9-1ubuntu3 buffer overflow
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This PPA has a patched version for noble, would you mind trying it out
please?
https://launchpad.net/~ahasenack/+archive/ubuntu/autofs-segfault-2061667
** Changed in: autofs (Ubuntu)
Status: Triaged => In Progress
** Also affects: autofs (Ubuntu Noble)
Importance: High
I managed to reproduce it finally after I added "strictexpire" to
/etc/auto.master
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Title:
Noble 'autofs' 5.1.9-1ubuntu3 buffer overflow
To
And your second reproducer, with /mp in auto.master, doesn't work here:
# ls -la /mp/mumon/_.
ls: cannot access '/mp/mumon/_.': No such file or directory
handle_packet: type = 3
handle_packet_missing_indirect: token 43, name mumon, request pid 4242
attempting to mount entry /mp/mumon
Which kernel are you running? There are some kernel version checks in
the code which affect a buffer size, and that's a buffer that
make_options_string() writes to.
I haven't been able to reproduce this yet, with any of your config
files. I'm on noble's kernel: 6.8.0-22
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** Changed in: autofs (Ubuntu)
Status: Incomplete => Triaged
** Changed in: autofs (Ubuntu)
Importance: Undecided => High
** Changed in: autofs (Ubuntu)
Assignee: (unassigned) => Andreas Hasenack (ahasenack)
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SO I have cut down the configuration files to a minimum:
petal# cat /etc/auto.master
#DIR[TYPE[,FORMAT]:]MAP [OPTIONS]
/- file,sun:/etc/auto.mp
petal# cat /etc/auto.mp
# vim:set ft=conf sw=2 noet nowrap:
/mp/mumon/._
Thanks for this, I know better where to look now. The config files or a
minimal reproducer would still help, of course.
In the meantime, you can also try debuginfod[1], which is a way for gdb
to automatically fetcl all the symbols for you.
TL;DR Something like this
sudo -i (because automounter
I will add the config files later. In the meantime this might be useful,
a baxcktrace under 'gdb':
*** buffer overflow detected ***: terminated
Thread 5 "automount" received signal SIGABRT, Aborted.
[Switching to Thread 0x73e706c0 (LWP 119683)]
__pthread_kill_implementation (no_tid=0,
Tried direct and indirect nfs mounts, and the test suite also does nfs
and cifs mounts, no segfault:
root@server:~# automount -d3 -f
Starting automounter version 5.1.9, master map /etc/auto.master
using kernel protocol version 5.05
lookup_nss_read_master: reading master file /etc/auto.master
Thanks for taking the time to report this bug and trying to make Ubuntu
better.
Could you please share your config files so we can try to reproduce the
bug locally?
** Changed in: autofs (Ubuntu)
Status: New => Incomplete
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