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

[Julian Andres Klode]

Public bug reported:

[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]

TODO for the chainboot, something similar to
https://github.com/lxc/lxd/issues/8770

For grub exit, we can easily launch VM and then EFI shell and then load
shim from in there, type exit in grub and should be back to EFI shell.

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

** Affects: shim (Ubuntu)
     Importance: Undecided
         Status: New

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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:
  New

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]

  TODO for the chainboot, something similar to
  https://github.com/lxc/lxd/issues/8770

  For grub exit, we can easily launch VM and then EFI shell and then
  load shim from in there, type exit in grub and should be back to EFI
  shell.

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

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