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

[Julian Andres Klode]

I'm not sure this is correct, fwiw, we do not use the upstream arm64
loader but the rhboot loader, which calls into the kernel using just:

  hf = (handover_func)((char *)kernel_addr + handover_offset + offset);
  hf (grub_efi_image_handle, grub_efi_system_table, kernel_params);


I see it got merged in https://github.com/rhboot/grub2/commit/71d05e4b19d62dc35e79c92732b5405e6bd24b71 but I'm not sure if we need any other patches too.

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Title:
  Support for kernels compiled with CONFIG_EFI_ZBOOT

Status in grub2-unsigned package in Ubuntu:
  New

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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