[Bug 1959618] Re: shim's fallback hangs in CopyMem, can't boot ISOs

[valdikss]

>However, fbx64.efi should not be included on ISO images

Sorry, my fault, there's no fbx64.efi in that ISO, and it doesn't boot due to unrelated issue.
However, I got an issue with fallback on Fedora, and Ubuntu also buggy version of shim.

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Title:
  shim's fallback hangs in CopyMem, can't boot ISOs

Status in shim package in Ubuntu:
  Triaged

Bug description:
  I'm getting black screen trying to boot KDE Neon Unstable neon-unstable-20220130-0332.iso, which uses
  shim-signed	1.40.7+15.4-0ubuntu9

  This is due to a bug in shim 15.4 fallback (fbx64.efi), it fails on
  CopyMem inside add_to_boot_list on my Lenovo X220 in this place of
  fallback.c:

      CopyMem(newbootorder + 1, bootorder, sizeof (CHAR16) * option);
      CopyMem(newbootorder + option + 1, bootorder + option + 1,
          sizeof (CHAR16) * (nbootorder - option - 1));

  The fix already present in upstream:
  https://github.com/rhboot/shim/commit/41319e14c9144063605750baccd5bb332a3cf4fc

  Kindly asking to apply this patch or update shim to current git
  master.

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