[Bug 1964510] Re: [SRU] enable signing riscv64 binaries in bionic

[Heinrich Schuchardt]

To verify use:

sbverify --cert db.crt test.efi.signed


** Patch added: "sbsigntool-0.9.2-2ubuntu1~18.04.2.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/sbsigntool/+bug/1964510/+attachment/5567798/+files/sbsigntool-0.9.2-2ubuntu1~18.04.2.debdiff

** Changed in: sbsigntool (Ubuntu)
       Status: New => Confirmed

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Title:
  [SRU] enable signing riscv64 binaries in bionic

Status in sbsigntool package in Ubuntu:
  Confirmed

Bug description:
  [Impact]

  The Ubuntu signing box is running Ubuntu Bionic. The riscv64
  architecture is expanding. We expect development boards using EDK II
  to appear in 2022. We should be able to support secure boot then.

  A patch for enabling this has been accepted upstream:

  https://git.kernel.org/pub/scm/linux/kernel/git/jejb/sbsigntools.git/commit/?h=next&id=25af2eb5e39b5d54703d4489182a6b9d0af58b76

  [Test Plan]

  * Signatures produced by sbsign in bionic, must be verifiable with
  sbverify from jammy.

  * Test instructions:
    - create as new certificate RSA2048) for signing EFI binaries
      openssl req -x509 -sha256 -newkey rsa:2048 -subj /CN=TEST_$*/ \
      -keyout db.key -out db.crt -nodes -days 3650
    - sign amd64, arm64 and riscv64 EFI binaries with Bionic's sbsign
      sbsign --key db.key --cert db.crt test.efi
    - check the signature with Jammy's sbverify
    - check the signature with Bionics's sbverify

  * Testing should be executed before landing the update.

  [Where problems could occur]

  * The upstream patch is trivial and should have no effect on any non-
  riscv64 architecture. It only changes the architecture test that is
  made before signing.

  * With the test procedure above we ensure that we still can sign on
  the same architectures as before.

  [Other Info]

  * A separate SRU should be done for Focal so that we don't loose
  functionality in case of an upgraded from Bionic to Focal.

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