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Description: ANDROID: binder: synchronize_rcu() when using POLLFREE
References:
https://source.android.com/security/bulletin/2020-02-01.html
Notes:
bwh> Although the upstream commit has been backported to 4.9, it
bwh> depends on commit 7a4408c6bd3e "binder: make sure accesses to
bwh> proc/thread are safe" which has not.
carnil> For tracking, this was in 4.9.196 with
carnil> b6c6212514fe9f2387fc6677181028d4a9ae20c7 commit in linux-4.9.y
carnil> branch
Bugs:
upstream: released (4.16-rc3) [5eeb2ca02a2f6084fc57ae5c244a38baab07033a]
5.10-upstream-stable: N/A "Fixed before branch point"
4.19-upstream-stable: N/A "Fixed before branching point"
4.9-upstream-stable: needed
3.16-upstream-stable: ignored "Too difficult and risky to backport"
sid: released (4.15.11-1)
5.10-bullseye-security: N/A "Fixed before branching point"
4.19-buster-security: N/A "Fixed before branching point"
4.9-stretch-security: ignored "binder not enabled, and risky to backport"
3.16-jessie-security: ignored "binder not enabled, and risky to backport"
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