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Description of problem:
Given the right combination of ThinkPad and X.org, just reading the video output control state is enough to hard-crash X.org.
    
Until the day I somehow find out a model or BIOS cut date to not provide this feature to ThinkPads that can do video switching through X RandR, change permissions so that only processes with CAP_SYS_ADMIN can access any sort of video output control state.
    
This bug could be considered a local DoS I suppose, as it allows any non-privledged local user to cause some versions of X.org to hard-crash some ThinkPads.
    
Reported-by: Jidanni <jidanni>
Signed-off-by: Henrique de Moraes Holschuh <hmh.br>
Cc: stable

Upstream commit:
http://git.kernel.org/linus/b525c06cdbd8a3963f0173ccd23f9147d4c384b5

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.