This bug was fixed in the package rsyslog - 8.2406.0-1ubuntu2
---------------
rsyslog (8.2406.0-1ubuntu2) oracular; urgency=medium
* d/usr.sbin.rsyslog: add apparmor rule to allow reading systemd sessions
(LP: #2056768)
-- Andreas Hasenack <andr...@canonical.com> Tue, 20 Aug 2024 09:46:06
-0300
** Changed in: rsyslog (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/2056768
Title:
apparmor="DENIED" operation="open" class="file" profile="rsyslogd"
name="/run/systemd/sessions/"
Status in rsyslog package in Ubuntu:
Fix Released
Status in rsyslog source package in Noble:
Confirmed
Bug description:
There is an AppArmor regression in current noble. In cockpit we
recently started to test on noble (to prevent the "major regressions
after release" fiasco from 23.10 again).
For some weird reason, rsyslog is installed *by default* [1] in the
cloud images. That is a rather pointless waste of CPU and disk space,
as it's an unnecessary running daemon and duplicates all the written
logs.
But more specifically, we noticed [2] an AppArmor rejection.
Reproducer is simple:
logger -p user.emerg --tag check-journal EMERGENCY_MESSAGE
this causes
type=1400 audit(1710168739.345:108): apparmor="DENIED"
operation="open" class="file" profile="rsyslogd"
name="/run/systemd/sessions/" pid=714 comm=72733A6D61696E20513A526567
requested_mask="r" denied_mask="r" fsuid=102 ouid=0
Note that it doesn't actually fail, the "EMERGENCY_MESSAGE" does
appear in the journal and also in /var/log/syslog. But it's some noise
that triggers our (and presumbly other admin's) log detectors.
rsyslog 8.2312.0-3ubuntu3
apparmor 4.0.0~alpha4-0ubuntu1
[1]
https://cloud-images.ubuntu.com/daily/server/noble/current/noble-server-cloudimg-amd64.manifest
[2]
https://cockpit-logs.us-east-1.linodeobjects.com/pull-6048-20240311-125838-b465e9b2-ubuntu-stable-other-cockpit-project-cockpit/log.html#118
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