tree 17eaabd86c2d1bb875e9590bd52de0a9457bac01
parent 68734604939070149f9da8f908b2a66364c90eeb
author Nathan Huckleberry <nhuck@google.com> 1677032908 +0000
committer Cherrypicker Worker <android-build-cherrypicker-worker@google.com> 1677610076 +0000

Clean up potential busy files after key eviction.

There is a race condition between key eviction and killing user
processes.  The race condition is difficult to properly fix without
significantly degrading UI performance.

If the race condition occurs, decrypted filesystem data is left in
various kernel caches.  To mitigate, we try to ensure the caches are
flushed by evicting the keys again in a worker thread.

Test: Checked that the correct log messages appear when evicting a
user's keys
Bug: 140762419

Change-Id: I9e39e5bb0f5190284552bcd252b6213a22a51e91
(cherry picked from commit a21962b207ebab74c333c95abaca103bc938f38d)
Merged-In: I9e39e5bb0f5190284552bcd252b6213a22a51e91