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[Launchpad Bug Tracker <1931136@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package shim - 15.4-0ubuntu5

---------------
shim (15.4-0ubuntu5) hirsute; urgency=medium

  * Rebuild in hirsute to get a more stable target to keep shim reproducible
    for a longer time.

shim (15.4-0ubuntu3) impish; urgency=medium

  [ Steve Langasek ]
  * Use -Zxz compression, for compatibility with dpkg in older releases.
    LP: #1925673

  [ Julian Andres Klode ]
  * Stop addending vendor dbx to MokListXRT during MokListX mirroring. This
    is causing systems to run out of EFI storage space, or just hang up
    when trying to write it (LP: #1924605) (LP: #1928434)
  * Further relax the check for variable mirroring on non-secureboot systems
    avoiding boot failures on out of space conditons (pull request #372)

  [ Seth Forshee ]
  * Don't unhook ExitBootServices() when EBS protection is disabled (LP: #1931136)
    (pull request #378)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Wed, 16 Jun 2021 12:52:45
+0200

** Changed in: shim (Ubuntu Hirsute)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1931136

Title:
  Don't unhook ExitBootServices() when EBS protection is disabled

Status in shim package in Ubuntu:
  Fix Released
Status in shim-signed package in Ubuntu:
  Fix Released
Status in shim source package in Xenial:
  Fix Committed
Status in shim source package in Focal:
  Fix Committed
Status in shim-signed source package in Focal:
  Fix Committed
Status in shim source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  This is a regression in shim 15.4 that causes a crash in shim when chainbooting.

  Also, the machine resets when you exit grub, rather than going back to
  the EFI shell when launched from it.

  [Test plan]

  Boot an Ubuntu hirsute image in Secure Boot mode. While this issue was
  originally seen while chainbooting in
  https://github.com/lxc/lxd/issues/8770 - it was shown to be also
  reproducible just by booting a hirsute instance.

  [Where problems could occur]
  In exiting shim, failure to boot, etc.

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