[Bug 1931994] Re: [Ubuntu 20.04] OpenSSL bugs in the s390x AES code

[Simon Chopin]

This time properly tested and verified on bionic via juju/canonistack,
where I sadly cannot boot any other version. The test fails properly
there in the -updates version, and succeeds (without having to
recompile) with the version in -proposed.

In addition, I round-tripped a file through AES-256-CBC and AES-128-ECB
for sanity-checking.

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

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Title:
  [Ubuntu 20.04] OpenSSL bugs in the s390x AES code

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in openssl package in Ubuntu:
  Fix Released
Status in openssl source package in Bionic:
  Fix Committed
Status in openssl source package in Focal:
  Fix Committed
Status in openssl source package in Hirsute:
  Fix Committed
Status in openssl source package in Impish:
  Fix Released

Bug description:
  Problem description:

  When passing a NULL key to reset AES EVC state, the state wouldn't be completely reset on s390x.
  https://github.com/openssl/openssl/pull/14900

  Solution available here:
  https://github.com/openssl/openssl/commit/dc67210d909b5dd7a50f60a96f36f3f5a891b1c8

  Should be applied to all distros where openssl 1.1.1 is included for consistency reason.
  -> 21.10, 20.04, 18.04.
  I think not needed for 16.04 anymore....

  [Test plan]

  $ sudo apt install libssl-dev
  $ gcc test.c -o evc-test -lcrypto -lssl # See https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1931994/comments/2 for the test.c program
  $ ./evc-test && echo OK

  [Where problems could occur]

  This patch only touches s390x code paths, so there shouldn't be any regression on other architectures. However, on s390x this could reveal
  latent bugs by spreading a NULL key to new code paths.

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