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x86/boot/startup: Disable objtool validation for library code

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The library code built under arch/x86/boot/startup is not intended to be
linked into vmlinux but only into the decompressor and/or the EFI stub.

This means objtool validation is not needed here, and may result in
false positive errors for things like missing retpolines.

So disable it for all objects added to lib-y

Tested-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20250408085254.836788-10-ardb+git@google.com
This commit is contained in:
Ard Biesheuvel
2025-04-08 10:52:56 +02:00
committed by Ingo Molnar
parent 4f2d1bbc2c
commit d9fa398fe8
1 changed files with 6 additions and 0 deletions
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6
arch/x86/boot/startup/Makefile
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@@ -4,3 +4,9 @@ KBUILD_AFLAGS += -D__DISABLE_EXPORTS
lib-$(CONFIG_X86_64) += la57toggle.o
lib-$(CONFIG_EFI_MIXED) += efi-mixed.o
#
# Disable objtool validation for all library code, which is intended
# to be linked into the decompressor or the EFI stub but not vmlinux
#
$(patsubst %.o,$(obj)/%.o,$(lib-y)): OBJECT_FILES_NON_STANDARD := y