[Bug 1964519] Re: [SRU] enable signing riscv64 binaries in focal

[Heinrich Schuchardt]

** Patch added: "sbsigntool_0.9.2-2ubuntu1~20.04.1.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/sbsigntool/+bug/1964519/+attachment/5567799/+files/sbsigntool_0.9.2-2ubuntu1~20.04.1.debdiff

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

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Title:
  [SRU] enable signing riscv64 binaries in focal

Status in sbsigntool package in Ubuntu:
  Confirmed

Bug description:
  [Impact]

  The Ubuntu signing box is currently 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 Focal's sbsign
      sbsign --key db.key --cert db.crt test.efi
    - check the signature with Jammy's sbverify
      sbverify --cert db.crt test.efi.signed
    - check the signature with Focal'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 #1964510 is requested for Bionic. We need this SRU so
  that we don't loose functionality in case of an upgrade from Bionic to
  Focal.

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