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

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You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

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

** Affects: livecd-rootfs (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
Focal 5.15 kernel apparmor mismatch missing snap_validate_preseed functionality in livecd-rootfs
https://bugs.launchpad.net/bugs/2059730
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