Re: [PATCH 4.14 05/40] efi/libstub: Disable Shadow Call Stack

[Pavel Machek]

Hi!

> From: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
> 
> [ Upstream commit cc49c71d2abe99c1c2c9bedf0693ad2d3ee4a067 ]
> 
> Shadow stacks are not available in the EFI stub, filter out SCS
> flags.

AFAICT, SCS is not available in 4.19, CC_FLAGS_SCS is not defined
there, and we should apply this patch.

Best regards,
								Pavel

> +++ b/drivers/firmware/efi/libstub/Makefile
> @@ -23,6 +23,9 @@ KBUILD_CFLAGS			:= $(cflags-y) -DDISABLE_BRANCH_PROFILING \
>  				   $(call cc-option,-ffreestanding) \
>  				   $(call cc-option,-fno-stack-protector)
>  
> +# 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

-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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