[Bug 1931136] Re: Don't unhook ExitBootServices() when EBS protection is disabled

[dann frazier]

>From inside the properly booting hirsute instance mentioned in the prior
comment:

ubuntu at ubuntu:~$ lsb_release -c
Codename:	hirsute
ubuntu at ubuntu:~$ sudo mokutil --sb-state
SecureBoot enabled


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

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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 Committed
Status in shim source package in Xenial:
  Fix Committed
Status in shim source package in Hirsute:
  Fix Committed

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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