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loader/linux: Remove magic number header field check

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The "ARM\x64" magic number in the file header identifies an image as one
that implements the bare metal boot protocol, allowing the loader to
simply move the file to a suitably aligned address in memory, with
sufficient headroom for the trailing .bss segment (the required memory
size is described in the header as well).

Note of this matters for GRUB, as it only supports EFI boot. EFI does
not care about this magic number, and nor should GRUB: this prevents us
from booting other PE linux images, such as the generic EFI zboot
decompressor, which is a pure PE/COFF image, and does not implement the
bare metal boot protocol.

So drop the magic number check.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>
This commit is contained in:
Wentao Guan 2024-08-25 18:41:47 +08:00
parent e2e760c1a2
commit 846cbabeee
1 changed files with 0 additions and 2 deletions
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2
GRUB2/MOD_SRC/grub-2.04/grub-core/loader/efi/linux.c
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@ -64,8 +64,6 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
grub_err_t grub_err_t
grub_arch_efi_linux_check_image (struct linux_arch_kernel_header * lh) grub_arch_efi_linux_check_image (struct linux_arch_kernel_header * lh)
{ {
if (lh->magic != GRUB_LINUX_ARMXX_MAGIC_SIGNATURE)
return grub_error(GRUB_ERR_BAD_OS, "invalid magic number");
if ((lh->code0 & 0xffff) != GRUB_PE32_MAGIC) if ((lh->code0 & 0xffff) != GRUB_PE32_MAGIC)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,