Description: ANDROID: binder: synchronize_rcu() when using POLLFREE
References:
 https://source.android.com/security/bulletin/2020-02-01.html
Notes:
Bugs:
upstream: released (4.16-rc3) [5eeb2ca02a2f6084fc57ae5c244a38baab07033a]
4.19-upstream-stable: N/A "Fixed before branching point"
4.9-upstream-stable: released (4.9.196) [b6c6212514fe9f2387fc6677181028d4a9ae20c7]
3.16-upstream-stable:
sid: released (4.15.11-1)
4.19-buster-security: "Fixed before branching point"
4.9-stretch-security: needed
3.16-jessie-security: