[Bug 2004208] Re: arm64 package has hardcoded x64 references

[Julian Andres Klode]

Signing needed for:

shim-signed - 1.54 kinetic
shim-signed - 1.51.3 jammy
shim-signed - 1.40.9 focal
shim-signed - 1.37~18.04.13 bionic

** Also affects: canonical-signing-jobs
   Importance: Undecided
       Status: New

** No longer affects: canonical-signing-jobs

** Also affects: shim-signed (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: shim-signed (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: shim-signed (Ubuntu Kinetic)
   Importance: Undecided
       Status: New

** Also affects: shim-signed (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: canonical-signing-jobs
   Importance: Undecided
       Status: New

** Changed in: canonical-signing-jobs
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/2004208

Title:
  arm64 package has hardcoded x64 references

Status in canonical-signing-jobs:
  In Progress
Status in shim-signed package in Ubuntu:
  New
Status in shim-signed source package in Bionic:
  New
Status in shim-signed source package in Focal:
  New
Status in shim-signed source package in Jammy:
  New
Status in shim-signed source package in Kinetic:
  New

Bug description:
  [Impact] 
  I couldn't figure out why the alternative wasn't being updated to the new shim after I installed a kernel installed w/ a 2022 key. Turns out its because we hardcode shim*x64* in the kernel hook:

  ubuntu at ubuntu:~$ grep x64 /etc/kernel/postinst.d/zz-shim
  if update-alternatives --query shimx64.efi.signed | grep "Best: /usr/lib/shim/shimx64.efi.signed.previous" -q; then

  There also seems to be a number of residual x64 references in the postinst:
  ubuntu at ubuntu:~$ grep x64 /var/lib/dpkg/info/shim-signed.*
  /var/lib/dpkg/info/shim-signed.postinst:	for efi_arch in x64 aa64; do
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.latest 100
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.previous 50
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.latest 50
  /var/lib/dpkg/info/shim-signed.postinst:			update-alternatives --install /usr/lib/shim/shim${efi_arch}.efi.signed shimx64.efi.signed /usr/lib/shim/shim${efi_arch}.efi.signed.previous 100
  /var/lib/dpkg/info/shim-signed.postinst:	if update-alternatives --query shimx64.efi.signed | grep "Best: /usr/lib/shim/shimx64.efi.signed.previous" -q; then

  [Test plan]
  Install a kernel signed with 2022 key on arm64, make sure that shimaa64.efi.signed alternative points to latest

  [Where problems could occur]
  Added/changed code could potentially break stuff on amd64.

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