** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1859522
Title:
use-after-free in i915_ppgtt_close
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Disco:
In Progress
Bug description:
[Impact]
Quan Luo and ycq from Codesafe Team of Legendsec at Qi'anxin Group
reported a use-after-free issue in the i915 driver. This issue has
been fixed in the upstream kernel starting in v5.2 with the following
commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7dc40713618c884bf07c030d1ab1f47a9dc1f310
The flaw was introduced in v4.14 with this change:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1acfc104cdf8a3408f0e83b4115d4419c6315005
The problem can be fixed by expanding the usage of struct_mutex to
include the GEM context lookup. A fix has been submitted to the
upstream stable list:
https://lore.kernel.org/stable/[email protected]/T/#u
[Test Case]
Enable KASAN and exercise the affected code path using the PoC
provided by Quan Luo.
[Regression Potential]
Low. This approach was suggested by upstream and has been well tested.
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