Red Hat Bugzilla – Bug 469389
Any user can send dbus messages to gdm that start a new X session
Last modified: 2015-01-14 18:21:57 EST
Any local user can call CreateTransientDisplay on the org.gnome.DisplayManager.LocalDisplayFactory interface which results in a new X session.
Beyond that this will annoy the hell out of whoever is on the local machine I suspect that a loop that keeps sending the message can be an effective DOS.
Created attachment 322103 [details]
So at a minimum we should modify the dbus security policy in /etc/dbus-1/system.d to only allow at_console users to run it, but really we should be using policykit to levy access.
Is this interface used to spawn another local session when some user is already logged-in in X? If so, restricting this to console users only sounds good. I'm not sure how PolicyKit is expected to be used here.
I at least have no idea at all as to what is using this interface. Probably just fast user switching but you never know.
I am not sure that I want my users to be able to start an unlimited amount of X servers even if they are in the console to tell the truth but this is a different story I guess.
This bug appears to have been reported against 'rawhide' during the Fedora 10 development cycle.
Changing version to '10'.
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