[SRU][B][C][D][Patch 0/1] pkey: Indicate old mkvp only if old and current mkvp are different (LP: 1832625)

[frank.heimes at canonical.com]

Buglink: https://bugs.launchpad.net/bugs/1832625

SRU Justification:

[Impact]

* 'zkey validate' shows wrong information about master key registers

* this might lead to unsuccessful usage of pkeys, although the master key and the derived keys are correct

[Fix]

* ebb7c695d3bc7a4986b92edc8d9ef43491be183e ebb7c69 "pkey: Indicate old mkvp only if old and current mkvp are different"

[Test Case]

* set a CCA master key

* generate a pkey

* 'change' (or better set) the current CCA master key to the exact same master key again which is currently in use

* execute a 'zkey validate'

[Regression Potential] 

* The regression potential can be considered as very low since this is purely s390x specific

* changes are limited to a single file (drivers/s390/crypto/pkey_api.c)

* patch changes only one line (actually expands an if stmt)

* and all this happens only in a very specific situation (in case a new master key was set, using the same key as before)

[Other Info]

* Problem was found during tests at IBM and is a so called 'preventive fix'

Ingo Franzki (1):
  From: Ingo Franzki <ifranzki at linux.ibm.com>

 drivers/s390/crypto/pkey_api.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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2.7.4