From: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
[ Upstream commit cc49c71d2abe99c1c2c9bedf0693ad2d3ee4a067 ]
Shadow stacks are not available in the EFI stub, filter out SCS flags.
Suggested-by: James Morse <james.morse@xxxxxxx>
Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Stable-dep-of: 1a3887924a7e ("efi: libstub: Disable struct randomization")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/firmware/efi/libstub/Makefile | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 8c5b5529dbc0..f3540d5dd276 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -31,6 +31,9 @@ KBUILD_CFLAGS := $(cflags-y) -DDISABLE_BRANCH_PROFILING \
$(call cc-option,-fno-addrsig) \
-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
--
2.35.1
