[Bug 2002226] Re: Add support for kernels compiled with CONFIG_EFI_ZBOOT

[Ubuntu Kernel Bot]

This bug is awaiting verification that the linux-
azure-6.5/6.5.0-1007.7~22.04.1 kernel in -proposed solves the problem.
Please test the kernel and update this bug with the results. If the
problem is solved, change the tag 'verification-needed-jammy-linux-
azure-6.5' to 'verification-done-jammy-linux-azure-6.5'. If the problem
still exists, change the tag 'verification-needed-jammy-linux-azure-6.5'
to 'verification-failed-jammy-linux-azure-6.5'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-jammy-linux-azure-6.5-v2 verification-needed-jammy-linux-azure-6.5

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https://bugs.launchpad.net/bugs/2002226

Title:
  Add support for kernels compiled with CONFIG_EFI_ZBOOT

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-unsigned package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in grub2 source package in Focal:
  Invalid
Status in grub2-unsigned source package in Focal:
  Invalid
Status in linux source package in Focal:
  Invalid
Status in grub2 source package in Jammy:
  Invalid
Status in grub2-unsigned source package in Jammy:
  Invalid
Status in linux source package in Jammy:
  Invalid
Status in grub2 source package in Lunar:
  Invalid
Status in grub2-unsigned source package in Lunar:
  Invalid
Status in linux source package in Lunar:
  Invalid

Bug description:
  [Impact]
  Arm64 kernels compiled with CONFIG_EFI_ZBOOT=y don't use the ARM64_IMAGE_MAGIC ('ARM\x64') but LINUX_PE_MAGIC (0x818223cd) in the PE Header. Our GRUB fails to boot such a kernel.

  We should eliminate the following check:

  grub-core/loader/efi/linux.c:75:
    if (lh->magic != GRUB_LINUX_ARCH_MAGIC_SIGNATURE)
      return grub_error(GRUB_ERR_BAD_OS, "invalid magic number");

  This will allow any EFI binary to be run using the linux command.

  [Test plan]
  * check that grub and EFI based ARM64 machines boot
  * check that MAAS deployment works

  [Where problems could occur]
  * Non-EFI bootloaders want to boot with regular vmlinuz.gz. If one is using piboot, u-boot, abootimg likely one still wants to build Image.gz and have CONFIG_EFI_ZBOOT disabled.

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