[Bug 2052789] Re: AppArmor profiles missing in kernel 5.15.0-1051+ release

[Jess Jang]

** Merge proposal linked:
   https://code.launchpad.net/~jessica-youjeong/livecd-rootfs/+git/livecd-rootfs/+merge/460455

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Title:
  AppArmor profiles missing in kernel 5.15.0-1051+ release

Status in livecd-rootfs package in Ubuntu:
  Confirmed
Status in livecd-rootfs source package in Focal:
  Confirmed
Status in livecd-rootfs source package in Jammy:
  New

Bug description:
  After the kernel roll to linux-gcp-5.15 to version
  5.15.0-1051.59_20.04.1 the public cloud team pre publication test were
  failing on our snap_preseed_optimized test which checks to ensure that
  snaps are preseeded correctly

  This test checks the output of `snap debug seeding` to assert `seed-
  completion` is present and not empty.

  ``
  ❯ snap debug seeding
  seeded:            true
  preseeded:         true
  image-preseeding:  39.367s
  seed-completion:   1.335s
  ```

  If `/var/lib/snapd/seed/seed.yaml` exists it also asserts that
  `preseeded` is present and not empty.

  With the recent kernel update this test is failing which indicates a kernel feature mismatch between
  the running kernel and the feature set hard-coded in livecd-rootfs for this image.
  Boot will be slowed by ~200ms until this is resolved in livecd-rootfs.

  This solution is to add a 5.15 apparmor configuration to the focal
  branch of livecd-rootfs

  The issue is also present with the recent 5.15 kernels in Jammy.

  Related bugs LP: #2031943 and LP: #2045384

  [ Impact ]

  Boot will be slowed by ~200ms until this is resolved in livecd-rootfs

  [ Test Plan ]

   * build any focal cloud image with HWE 5.15 kernel
   * boot
   * run `snap debug preseed`
   * assert the test described above passes

  [ Where problems could occur ]

   * Similar patches already exist for later releases 6.2, 6.5 kernel
  etc. and have been used on other private customer kernels and all
  kernels released after 22.04, so there is already a good track record
  for this patchset and it shouldn't create any issues.

  [ Other Info ]

   * This is a time-sensitive issue for a paying customer

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