[Bug 1314527] Re: thermald: change the default dbus policy, make it more restrictive
Launchpad Bug Tracker
1314527 at bugs.launchpad.net
Thu May 1 11:23:44 UTC 2014
This bug was fixed in the package thermald - 1.1~rc2-12
---------------
thermald (1.1~rc2-12) unstable; urgency=medium
* Deny non root users to send system bus dbus messages (LP: #1314527)
-- Colin King <colin.king at canonical.com> Wed, 30 Apr 2014 09:30:21
+0100
** Changed in: thermald (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1314527
Title:
thermald: change the default dbus policy, make it more restrictive
Status in “thermald” package in Ubuntu:
Fix Released
Status in “thermald” source package in Trusty:
Fix Committed
Bug description:
org.freedesktop.thermald.conf default dbus policy should be more
restrictive
===
SRU Justification:
[Impact]
With the current dbus policy one can terminate thermald using:
dbus-send --system --dest=org.freedesktop.thermald /org/freedesktop/thermald org.freedesktop.thermald.Terminate
thermald can be send dbus
..fortunately init respawns thermald, but the policy is not
restrictive enough, only root should be able to do this.
Justification:
This fix restricts the default policy so only root can send dbus
messages to thermald.
[Test Case]
How to reproduce:
dbus-send --system --dest=org.freedesktop.thermald /org/freedesktop/thermald org.freedesktop.thermald.Terminate
thermald can be send dbus
then use: dmesg and see that init has respawned thermald (which means
it received the dbus message and handled it)
With the fix, the dbus-send message won't kill thermald and hence one
won't see the re-spawn message in dmesg.
[Regression Potential]
Cannot think of any, low to none. Thermald is not a default install,
it is a new packaging in Trusty and is currently op-in, so this change
has minimal impact. Regression potential is that users won't be able
to communicate to thermald via dbus-send, which is not the recommended
way to shut down thermald anyhow.
Tested today on an AMD64 trusty install.
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