This bug is awaiting verification that the linux-azure/5.4.0-1110.116
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-focal' to 'verification-done-focal'. If the
problem still exists, change the tag 'verification-needed-focal' to
'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-focal-linux-azure verification-needed-focal

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

Title:
  Azure: keys: Do not cache key in task struct if key is requested from
  kernel thread

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Focal:
  Fix Committed

Bug description:
  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

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