[Bug 2059730] Re: Focal 5.15 kernel apparmor mismatch missing snap_validate_preseed functionality in livecd-rootfs

[Timo Aaltonen]

Hello John, or anyone else affected,

Accepted livecd-rootfs into focal-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/livecd-
rootfs/2.664.53 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-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. 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.

** Changed in: livecd-rootfs (Ubuntu Focal)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/2059730

Title:
  Focal 5.15 kernel apparmor mismatch missing snap_validate_preseed
  functionality in livecd-rootfs

Status in livecd-rootfs package in Ubuntu:
  New
Status in livecd-rootfs source package in Focal:
  Fix Committed

Bug description:
  kernel bug

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2045384

  introduced an apparmor change to the 5.15. This rolled down to the
  Focal HWE 5.15 kernel, causing failures to properly snap seed

  The original functionality was added into ubuntu/master and
  ubuntu/jammy with this bug:

  https://bugs.launchpad.net/ubuntu/+source/livecd-rootfs/+bug/2015596

  which happened during the HWE roll to the 5.19 kernel. There was an
  assumption that a breaking change like this would not affect Focal, as
  rolls were done. However, 2045384 shows that this is not necessarily
  true.

  To fix 2045384, a backport to focal of the functionality in
  snap_validate_seed allowing matching on kernel version, and the
  creation of kernel specific directories is required

  [ Impact ]

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

  [ Test Plan ]

   * for focal build any cloud image with preseeded snaps with HWE 5.15 kernel
   * boot
   * run `snap debug seeding`
   * 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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