Red Hat Bugzilla – Bug 489538
severe badness on F-10 -> rawhide upgrade w.r.t. policy and dbus
Last modified: 2014-03-16 23:17:47 EDT
Description of problem:
We've noticed recently a spate of errors on rawhide upgrades where, in the middle of the transaction, the desktop goes away and the transaction dies.
Upon debugging, it appears that the session bus for the desktop is refusing connections.
Coincident with the error appears to be the following message in syslog:
SELinux: Context unconfined_u:unconfined_r:unconfined_dbusd_t:s0-s0:c0.c1023 became invalid (unmapped)
Is the policy update removing the running context out from under the session bus? If so, how do we prevent this, as it causes fairly catastrophic effects to the desktop session.
Version-Release number of selected component (if applicable):
Often enough that it's not a coincidence
Fixed in selinux-policy-3.6.8-3.fc11
So if the SELinux policy removes a previously valid context, in general we will have a problem with any userspace program which acts as a SELinux userspace security manager. Right now dbus is the most prominent, but the X server has the fundamental support, and once we add policy a similar bug could reappear there.
The solutions I see are:
1) Never remove security contexts from policy (an automated check here would probably be pretty easy)
2) Don't apply selinux-policy changes immediately, they require a reboot