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efi/libstub: Disable Shadow Call Stack

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Shadow stacks are not available in the EFI stub, filter out SCS flags.

Suggested-by: James Morse <james.morse@arm.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Sami Tolvanen 2020-04-27 09:00:18 -07:00 committed by Will Deacon
parent 439dc2a117
commit cc49c71d2a
1 changed files with 3 additions and 0 deletions
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3
drivers/firmware/efi/libstub/Makefile
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@ -32,6 +32,9 @@ KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
$(call cc-option,-fno-stack-protector) \
-D__DISABLE_EXPORTS
# remove SCS flags from all objects in this directory
KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
GCOV_PROFILE := n
KASAN_SANITIZE := n
UBSAN_SANITIZE := n