[Bug 2002226] Re: Support for kernels compiled with CONFIG_EFI_ZBOOT

[Dimitri John Ledkov]

This is resolved correctly in grub2-2.12~rc1. Once that hits mantic, we
will be able to upgrade most of our arm64 kernels to that (generic,
cloud).

Kernels that use u-boot (direct), abootimg, piboot will have to stay as
they are - unless they gain zboot image format boot support.

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- Support for kernels compiled with CONFIG_EFI_ZBOOT
+ Add support for kernels compiled with CONFIG_EFI_ZBOOT

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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:
  Triaged
Status in grub2-unsigned package in Ubuntu:
  Triaged
Status in linux package in Ubuntu:
  Triaged

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]
  TBD

  [Where problems could occur]
  TBD

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