[Bug 1921134] Re: SBAT shim 15.4 release

[Steve Langasek]

> It turns out that while there is no signed *fwupd* on xenial, there is a
> signed *fwupdate*, so releasing this update would break firmware
> updating after all :/

Not a blocker.  fwupdate is obsolete, cannot be trivially migrated to
fwupd (the SRU of fwupd-signed in bionic was quite painful), and already
lacks support for a lot of relevant firmware updates.  On behalf of the
SRU team, I had already taken the decision to allow fwupdate-signed to
regress in xenial in favor of continued SecureBoot support.

** 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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