[Bug 2040194] Re: apparmor restricts read access of user namespace mediation sysctls to root

This bug is awaiting verification that the linux-gke/6.8.0-1004.7 kernel
in -proposed solves the problem. Please test the kernel and update this
bug with the results. If the problem is solved, change the tag
'verification-needed-noble-linux-gke' to 'verification-done-noble-linux-
gke'. If the problem still exists, change the tag 'verification-needed-
noble-linux-gke' to 'verification-failed-noble-linux-gke'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-gke-v2 verification-needed-noble-linux-gke

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https://bugs.launchpad.net/bugs/2040194

Title:
apparmor restricts read access of user namespace mediation sysctls to
root

Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Mantic:
Fix Committed

Bug description:
lxc and lxd currently need to determine if the apparmor restriction
on unprivileged user namespaces are being enforced, so that apparmor
restrictions won't break lxc/d, and they won't clutter the logs
by doing something like

unshare true

to test if the restrictions are being enforced.

Ideally access to this information would be restricted so that any
unknown access would be logged, but lxc/d currently aren't ready for
this so in order to _not_ force lxc/d to probe whether enforcement is
enabled, open up read access to the sysctls for unprivileged user
namespace mediation.

https://github.com/canonical/lxd/issues/11920#issuecomment-1756110109

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