[Bug 1860574] [NEW] [UBUNTU 20.04] zkey: Fix display of clear key size for XTS keys

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Description:   zkey: Fix display of clear key size for XTS keys
Symptom:       The 'zkey list' command shows bogus values for the
               keys 'Clear key size' for XTS keys of type CCA-AESDATA
               or CCA-AESCIPHER.
Problem:       XTS keys consist of 2 keys concatenated to each other.
               To calculate the clear key size, the clear key size of
               both keys must be added. The code does not address the
               second key correctly, and thus reads the clear key size
               of the second key from an invalid memory location. This
               results in bogus values reported as clear key size.
               This bug has been introduced with feature "Cipher
               key support" with commit 298fab68fee8 "zkey: Preparations 
               for introducing a new key type".
Solution:      Correct the addressing of the second key.
Reproduction:  Generate an XTS key of type CCA-AESDATA or CCA-AESCIPHER
               and then run 'zkey list'.

Upstream commit:
https://github.com/ibm-s390-tools/s390-tools/commit/e7f446432b92b293e758099842843cfb1f18fa97

** Affects: ubuntu-z-systems
     Importance: Undecided
         Status: New

** Affects: s390-tools (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-183404 severity-high targetmilestone-inin2004
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[UBUNTU 20.04] zkey: Fix display of clear key size for XTS keys
https://bugs.launchpad.net/bugs/1860574
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