[PATCH 0/1] [Focal linux-azure]Azure: keys: Do not cache key in task struct if key is requested from kernel thread

[Tim Gardner]

BugLink: https://bugs.launchpad.net/bugs/2017801

SRU Justification

[Impact]

The key which gets cached in task structure from a kernel thread does not
get invalidated even after expiry. Due to which, a new key request from
kernel thread will be served with the cached key if it's present in task
struct irrespective of the key validity.

[Fix]

commit 47f9e4c924025c5be87959d3335e66fcbb7f6b5c ('keys: Do not cache key in task
struct if key is requested from kernel thread')
Fixes: 7743c48e54ee ("keys: Cache result of request_key*() temporarily in task_struct")

[Regression potential]

DNS keys used by CIFS could get confused.

[Other Info]

Though this commit is part of stable updates v5.4.240, MSFT has requested that
it be applied in advance since Focal is only up to v5.4.233. Linux-azure 5.4
is the only kernel that does not have this patch.

SF: #00359129