[Bug 1900774] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for grub2 has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1900774

Title:
  [arm64] EFI stub: ERROR: FIRMWARE BUG: efi_loaded_image_t::image_base
  has bogus value

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Xenial:
  Fix Committed
Status in grub2 source package in Bionic:
  Fix Committed
Status in grub2 source package in Focal:
  Fix Committed
Status in grub2 source package in Groovy:
  Fix Released
Status in grub2 source package in Hirsute:
  Fix Released

Bug description:
  [Impact]
  When booting a kernel >= 5.7 via GRUB on an arm64 server, the EFI stub falsely reports a firmware bug:

  EFI stub: Booting Linux Kernel...
  EFI stub: EFI_RNG_PROTOCOL unavailable, no randomness supplied
  EFI stub: ERROR: FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value
  EFI stub: Using DTB from configuration table
  EFI stub: Exiting boot services and installing virtual address map...
  [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x431f0a10]

  [Test Case]
  Boot the arm64 groovy kernel, or any other kernel >= 5.7.
  Regression test on an EFI based x86 system (e.g. lxc --vm)

  [Fix]
  https://github.com/rhboot/grub2/commit/1d5ef08216edec4d31d0e10cfdb30b5ebfef7a45

  [Where Problems Could Occur]
  The fix is in GRUB's EFI loader, so problems would likely appear early in the boot of the kernel (during EFI stub processing).

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