[patch 58/96] efi: avoid fortify checks in EFI stub

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From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: efi: avoid fortify checks in EFI stub

This avoids CONFIG_FORTIFY_SOURCE from being enabled during the EFI stub
build, as adding a panic() implementation may not work well.  This can be
adjusted in the future.

Link: http://lkml.kernel.org/r/1497903987-21002-2-git-send-email-keescook@xxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Suggested-by: Daniel Micay <danielmicay@xxxxxxxxx>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Acked-by: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/firmware/efi/libstub/Makefile |    1 +
 1 file changed, 1 insertion(+)

diff -puN drivers/firmware/efi/libstub/Makefile~efi-avoid-fortify-checks-in-efi-stub drivers/firmware/efi/libstub/Makefile
--- a/drivers/firmware/efi/libstub/Makefile~efi-avoid-fortify-checks-in-efi-stub
+++ a/drivers/firmware/efi/libstub/Makefile
@@ -17,6 +17,7 @@ cflags-$(CONFIG_ARM)		:= $(subst -pg,,$(
 cflags-$(CONFIG_EFI_ARMSTUB)	+= -I$(srctree)/scripts/dtc/libfdt
 
 KBUILD_CFLAGS			:= $(cflags-y) -DDISABLE_BRANCH_PROFILING \
+				   -D__NO_FORTIFY \
 				   $(call cc-option,-ffreestanding) \
 				   $(call cc-option,-fno-stack-protector)
 
_
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