With the updated context, I think the proposal looks reasonable and
would be comfortable sponsoring the upload.  I suggest first waiting for
the lvm2 merge to migrate, just to rule out issues on that front.

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https://bugs.launchpad.net/bugs/2054620

Title:
  libdm returns wrong error code when dm-verity key cannot be found

Status in lvm2 package in Ubuntu:
  Confirmed
Status in lvm2 source package in Noble:
  Confirmed

Bug description:
  When libcryptsetup tries to activate a signed dm-verity volume, and
  the key is not in the kernel keyring, libdevicemapper does not return
  the appropriate ENOKEY, so the failure cannot be distinguished from
  other generic issues.

  This is a problem when software like systemd via libcryptsetup try to
  open a volume, and get an unrecognizable error out of it. With the fix
  in libdm and libcryptsetup, there is a clear ENOKEY returned when a
  key is missing and activation fails for that reason. This allows
  systemd (and other applications) to make the right decision depending
  on the failure case. Without this, the same generic error is returned
  in any case.

  For more details, see:

  https://gitlab.com/cryptsetup/cryptsetup/-/issues/841

  libcryptsetup 2.7.0, now available in debian stable, and systemd v255,
  shipped in Noble, make use of this error code.

  This is fixed in the lvm2 version 2.03.23 upstream release.

  Please consider backporting this patch for Noble.

  Upstream PR: https://gitlab.com/lvmteam/lvm2/-/merge_requests/3
  Upstream commit: 25ef7a7b1a876f491bd361369423d7309358f6c1

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