** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1798897
Title:
Linux: insufficient shootdown for paging-structure caches
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Committed
Status in linux source package in Cosmic:
Fix Released
Status in linux source package in DD-Series:
Fix Released
Bug description:
https://bugs.chromium.org/p/project-zero/issues/detail?id=1633
[Impact]
Paging structure caches are not always flushed as part of a TLB
shootdown operation on x86.
[Test Case]
Ideally, we'd be able to use the test case described in the Project
Zero bug report. However, it depends on certain processor features as
well as custom kernel changes to make the proof-of-concept more likely
to be successful.
Instead, I think we're limited to simple boot testing and then will
need to rely on our regular SRU testing.
[Regression Potential]
Considerable since the changes are in mm/ but these three patches have
been released in the upstream linux-stable trees for a while now.
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