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[Launchpad Bug Tracker <1931136@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package shim-signed - 1.37~18.04.10

---------------
shim-signed (1.37~18.04.10) bionic; urgency=medium

  * Remove unnecessary efitools dependency that prevented build on arm64

shim-signed (1.37~18.04.9) bionic; urgency=medium

  * New upstream release 15.4.  LP: #1921134
  * Synchronize packaging with 1.50, summary
    - Update packaging to pull fb and mm from shim-signed package as in
      later releases, dropping the runtime dependency on shim.
    - Add download-signed script from linux-signed package
    - Include reworked Makefile from devel to better assert the integrity of
      the executables.
    - Dual-signed shim
    - Set XB-Important: yes on shim-signed package so that it cannot be
      removed by accident (LP: #1898729)
    - download-signed: Fetch signed artefacts from versioned URL instead
      of current/ symlink to work around caching (LP: #1936640)
  * Update to shim 15.4-0ubuntu5:
    - 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)
    - Don't unhook ExitBootServices() when EBS protection is disabled
      (LP: #1931136) (pull request #378)
  * Update to shim 15.4-0ubuntu7:
    - Fix load option parsing, and thus fwupd execution (LP: #1929471) (PR #379)
    - Fix occasional crashes in _relocate() on arm64 (LP: #1928010) (PR #383)
    - Fix accidental deletion of RT variables (LP: #1934506) (PR #387)
    - mok: relax the maximum variable size check (LP: #1934780) (PR #369)

 -- Julian Andres Klode <juliank@xxxxxxxxxx>  Mon, 19 Jul 2021 17:01:19
+0200

** Changed in: shim-signed (Ubuntu Bionic)
       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 Released
Status in shim-signed source package in Xenial:
  Fix Released
Status in shim-signed source package in Bionic:
  Fix Released
Status in shim source package in Focal:
  Fix Released
Status in shim-signed source package in Focal:
  Fix Released
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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