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

[Dimitri John Ledkov]

** Description changed:

  [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
+ * check that grub and EFI based ARM64 machines boot
+ * check that MAAS deployment works
  
  [Where problems could occur]
- TBD
+ * Non-EFI bootloaders like still 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.

** Description changed:

  [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 like still 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.
+ * 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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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:
  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]
  * 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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