Commit 24b72bb1 authored by Peter Jones's avatar Peter Jones Committed by Ard Biesheuvel
Browse files

efi: x86: Set the NX-compatibility flag in the PE header 



Following Baskov Evgeniy's "Handle UEFI NX-restricted page tables"
patches, it's safe to set this compatibility flag to let loaders know
they don't need to make special accommodations for kernel to load if
pre-boot NX is enabled.

Signed-off-by: default avatarPeter Jones <pjones@redhat.com>
Link: https://lore.kernel.org/all/20220329184743.798513-1-pjones@redhat.com/


Signed-off-by: default avatarArd Biesheuvel <ardb@kernel.org>
parent 82e0d6d7

arch/x86/boot/header.S

+4 −0
Original line number Diff line number Diff line
@@ -163,7 +163,11 @@ extra_header_fields: 
	.long	0x200				# SizeOfHeaders

	.long	0				# CheckSum

	.word	IMAGE_SUBSYSTEM_EFI_APPLICATION	# Subsystem (EFI application)

#ifdef CONFIG_DXE_MEM_ATTRIBUTES

	.word	IMAGE_DLL_CHARACTERISTICS_NX_COMPAT	# DllCharacteristics

#else

	.word	0				# DllCharacteristics

#endif

#ifdef CONFIG_X86_32

	.long	0				# SizeOfStackReserve

	.long	0				# SizeOfStackCommit