Ulogd crashes when pcap file has wrong permissions

[Roman Fiedler]

When ulogd2 has problems reopening the pcap file it will crash immediately or some seconds later - most likely due to first attempt to flush packets to dump file after reopen (file NULL-ptr?).

Reproduce:

chown root.root /var/log/ulog/ulogd.pcap
chmod 0644 /var/log/ulog/ulogd.pcap

# Invoke command similar to logrotate:
invoke-rc.d ulogd2 reload

Mar 9 00:15:43 localhost ulogd[3567]: can't open pcap file /var/log/ulog/ulogd.pcap: Permission denied
Mar 9 00:15:44 localhost kernel: [210247.584746] ulogd[3567]: segfault at 0 ip 00007fbd8379fda0 sp 00007ffff30e8ed0 error 4 in libc-2.19.so[7fbd83731000+1bb000]

# lsb_release -rd
Description: Ubuntu 14.04.2 LTS
Release: 14.04

# apt-cache policy ulogd2-pcap
ulogd2-pcap:
  Installed: 2.0.3-1ubuntu2
  Candidate: 2.0.3-1ubuntu2
  Version table:
 *** 2.0.3-1ubuntu2 0
        500 http://debarchive-ehealth.d03.arc.local/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status
# apt-cache policy ulogd2
ulogd2:
  Installed: 2.0.3-1ubuntu2
  Candidate: 2.0.3-1ubuntu2
  Version table:
 *** 2.0.3-1ubuntu2 0
        500 http://debarchive-ehealth.d03.arc.local/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status

[Jeremy Sowden (a3a3el)]

Yeah, I have a good idea what's happened there. I'll get it fixed upstream.

[Launchpad Janitor (janitor)]

This bug was fixed in the package ulogd2 - 2.0.8-2

---------------
ulogd2 (2.0.8-2) unstable; urgency=medium

  * d/control:
    - bump Standards-Version to 4.6.2
    - remove obsolete dep on lsb-base
    - update my e-mail address
    - update pkg-config build-dep to pkgconf
  * d/patches:
    - refresh existing patches
    - add patches to fix possible null pointer dereference when reopening
      pcap output file (LP: #1429778).

 -- Jeremy Sowden <email address hidden> Sat, 02 Mar 2024 20:49:33 +0000