[Bug 2004201] [NEW] is-not-revoked does not handle gzip'd kernels

[dann frazier]

Public bug reported:

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

** Affects: shim-signed (Ubuntu)
     Importance: Undecided
         Status: New

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

Status in shim-signed package in Ubuntu:
  New

Bug description:
  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

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