[Bug 1921134] Re: SBAT shim 15.4 release

[Julian Andres Klode]

I had already checked the various chainbooting thingies for newer
releases, and the binaries are the same, so for xenial, I have validated
the mokutil integration and everything worked as expected with
1.33.1~16.04.9

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

** Tags removed: block-proposed-xenial

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https://bugs.launchpad.net/bugs/1921134

Title:
  SBAT shim 15.4 release

Status in OEM Priority Project:
  Confirmed
Status in shim package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Fix Released
Status in shim-signed source package in Xenial:
  Fix Committed
Status in shim-signed source package in Focal:
  Fix Committed
Status in shim-signed source package in Hirsute:
  Fix Released

Bug description:
  [Impact]

   * New upstream shim release 15.4
   * It includes and enforces SBAT validation

  [Test Plan]

   * https://wiki.ubuntu.com/UEFI/SecureBoot/ShimUpdateProcess/TestPlan

  [Where problems could occur]

   * Upgrading to new shim, without upgrading to the new grub with sbat
  will fail to boot, as grub must include SBAT section.

   * Upgrading to new shim, without upgrading to the new fwupdate with
  sbat will fail to boot, as fwupdate must include SBAT section.

  [Other Info]

   * All patches are dropped, as all got included in the v15.3 upstream release
   * Embedded ephemeral shim certificate is now gone, and archive key is used to sign fb/mm
   * Vendor DBX is included that revokes Boothole & ACPI-bypass vulnerable grubs and shims
   * This upload obsoletes shim-signed-canonical package

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