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

[John Chittum]

Public bug reported:

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

** Description changed:

  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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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

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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