[Bug 2004201] Please test proposed package

[Steve Langasek]

Hello dann, or anyone else affected,

Accepted shim-signed into bionic-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/shim-
signed/1.37~18.04.13 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/2004201

Title:
  is-not-revoked does not handle gzip'd kernels

Status in shim-signed package in Ubuntu:
  New
Status in shim-signed source package in Bionic:
  Fix Committed
Status in shim-signed source package in Focal:
  Fix Committed
Status in shim-signed source package in Jammy:
  Fix Committed
Status in shim-signed source package in Kinetic:
  Fix Committed

Bug description:
  [Impact]

  arm64 kernels are gzip'd by default, which currently breaks is-not-
  revoked:

  ubuntu at ubuntu:~$ sudo file /boot/vmlinuz-5.15.0-57-generic
  /boot/vmlinuz-5.15.0-57-generic: gzip compressed data, was "vmlinuz-5.15.0-57-generic.efi.signed", last modified: Tue Nov 29 10:47:41 2022, max compression, from Unix, original size modulo 2^32 46283136

  ubuntu at ubuntu:~$ sudo /usr/lib/shim/is-not-revoked /boot/vmlinuz-5.15.0-57-generic ~
  Invalid DOS header magic
  Can't open image /boot/vmlinuz-5.15.0-57-generic
  E: /boot/vmlinuz-5.15.0-57-generic: Could not finder signing subject, sbverify output follows:
  Invalid DOS header magic
  Can't open image /boot/vmlinuz-5.15.0-57-generic

  If I decompress the vmlinuz file in place, it works:
  ubuntu at ubuntu:~$ sudo /usr/lib/shim/is-not-revoked /boot/vmlinuz-5.15.0-57-generic ~
  Invalid DOS header magic
  Can't open image /boot/vmlinuz-5.15.0-57-generic
  E: /boot/vmlinuz-5.15.0-57-generic: Could not finder signing subject, sbverify output follows:
  Invalid DOS header magic
  Can't open image /boot/vmlinuz-5.15.0-57-generic
  ubuntu at ubuntu:~$ echo $?
  1

  [Test plan]
  Test gzipped kernels per above

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

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