Public bug reported:
An upgrade to Xorg 1.11, and a restart later, when I tried to play a
video in VLC, X crashed. I looked into /var/log/Xorg.0.log.old and found
a segfault in /usr/bin/X. The fault seemed to be with fglrx, so I
disabled Hardware Acceleration in VLC (Video Overlay). All was fine now
without Hardware Acceleration. When I opened chrome://gpu in Google
Chrome, it showed:
unable to boot the gpu process
while previously it used to have full Hardware Accelaration (except 2d
canvas)
I enable Hardware Acceleration in VLC, and it crashes again. I open any
game that uses Hardware Accelaration: it crashes again.
System:
Ubuntu 12.04 (all updates installed, freshly booted)
ATI Mobility Radeon HD 5470 (any other card of the fglrx family will work too)
Steps to reproduce:
1) install the xserver-xorg pakages (with X 1.11 being the latest, and the
cause here.)
2) install fglrx package (either from the repo, or built by the binary from
ati.com, same issue)
3) enable Overlay in VLC's video settings
4) Play any video (preferably .264 encoded, they have most wide Hardware
support.)
I'm not sure whether to classsify it as a security vulnerabilty (a non-
privileged process being able to crash the display server, and take all
other open apps with it.)
** Affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/925244
Title:
X crashes on GPU access by userspace apps, Hardware Acceleration
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/925244/+subscriptions
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