Bug#1037555: autofs: automount -m triggers segfaults

[Rik Theys]

Package: autofs
Version: 5.1.8-2
Severity: minor

Dear Maintainer,

When running "automount -m" to debug the maps used by autofs, I noticed that
this triggers segfaults as can be seen in 'dmesg':

[Wed Jun 14 08:05:38 2023] automount[9026]: segfault at 8 ip 00007f5d6f3d4d19 sp 00007ffd202ac5d8 error 4 in libc.so.6[7f5d6f2a5000+155000] likely on CPU 1 (core 0, socket 1)
[Wed Jun 14 08:05:38 2023] Code: fe 7f 5c 17 e1 c5 f8 77 c3 0f 1f 84 00 00 00 00 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 37 01 00 00 <c5> fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 c5 f8 77 c3 0f 1f
[Wed Jun 14 08:05:38 2023] automount[9028]: segfault at 8 ip 00007f5d6f3d4d19 sp 00007ffd202ac5d8 error 4 in libc.so.6[7f5d6f2a5000+155000] likely on CPU 1 (core 0, socket 1)
[Wed Jun 14 08:05:38 2023] Code: fe 7f 5c 17 e1 c5 f8 77 c3 0f 1f 84 00 00 00 00 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 37 01 00 00 <c5> fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 c5 f8 77 c3 0f 1f
[Wed Jun 14 08:05:38 2023] automount[9030]: segfault at 8 ip 00007f5d6f3d4d19 sp 00007ffd202ac5d8 error 4 in libc.so.6[7f5d6f2a5000+155000] likely on CPU 1 (core 0, socket 1)
[Wed Jun 14 08:05:38 2023] Code: fe 7f 5c 17 e1 c5 f8 77 c3 0f 1f 84 00 00 00 00 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 37 01 00 00 <c5> fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 c5 f8 77 c3 0f 1f
[Wed Jun 14 08:05:38 2023] automount[9032]: segfault at 8 ip 00007f5d6f3d4d19 sp 00007ffd202ac5d8 error 4 in libc.so.6[7f5d6f2a5000+155000] likely on CPU 0 (core 0, socket 0)
[Wed Jun 14 08:05:38 2023] Code: fe 7f 5c 17 e1 c5 f8 77 c3 0f 1f 84 00 00 00 00 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 37 01 00 00 <c5> fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 c5 f8 77 c3 0f 1f
[Wed Jun 14 08:05:38 2023] automount[9034]: segfault at 8 ip 00007f5d6f3d4d19 sp 00007ffd202ac5d8 error 4 in libc.so.6[7f5d6f2a5000+155000] likely on CPU 1 (core 0, socket 1)
[Wed Jun 14 08:05:38 2023] Code: fe 7f 5c 17 e1 c5 f8 77 c3 0f 1f 84 00 00 00 00 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 37 01 00 00 <c5> fd 74 0f c5 fd d7 c1 85 c0 74 5b f3 0f bc c0 c5 f8 77 c3 0f 1f

The application seems to be working fine otherwise.

nsswitch.conf has the following line for automount:

automount: files sss

Regards,
Rik

-- System Information:
Debian Release: 12.0
APT prefers stable-security
APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-9-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages autofs depends on:
ii init-system-helpers 1.65.2
ii libc6 2.36-9
ii libnsl2 1.3.0-2
ii libtirpc3 1.3.3+ds-1
ii libxml2 2.9.14+dfsg-1.2
ii ucf 3.0043+nmu1

Versions of packages autofs recommends:
ii e2fsprogs 1.47.0-2
ii kmod 30+20221128-1
ii nfs-common 1:2.6.2-4

autofs suggests no packages.

-- no debconf information