diff options
Diffstat (limited to 'arch/arm64/Makefile')
| -rw-r--r-- | arch/arm64/Makefile | 28 |
1 files changed, 8 insertions, 20 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index e176eb76345b..ab1f12b4f339 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -63,30 +63,18 @@ stack_protector_prepare: prepare0 include/generated/asm-offsets.h)) endif -# Ensure that if the compiler supports branch protection we default it -# off, this will be overridden if we are using branch protection. -branch-prot-flags-y += $(call cc-option,-mbranch-protection=none) - -ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) -branch-prot-flags-$(CONFIG_CC_HAS_SIGN_RETURN_ADDRESS) := -msign-return-address=all -# We enable additional protection for leaf functions as there is some -# narrow potential for ROP protection benefits and no substantial -# performance impact has been observed. -PACRET-y := pac-ret+leaf - -# Using a shadow call stack in leaf functions is too costly, so avoid PAC there -# as well when we may be patching PAC into SCS -PACRET-$(CONFIG_UNWIND_PATCH_PAC_INTO_SCS) := pac-ret - ifeq ($(CONFIG_ARM64_BTI_KERNEL),y) -branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET_BTI) := -mbranch-protection=$(PACRET-y)+bti + KBUILD_CFLAGS += -mbranch-protection=pac-ret+bti +else ifeq ($(CONFIG_ARM64_PTR_AUTH_KERNEL),y) + ifeq ($(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET),y) + KBUILD_CFLAGS += -mbranch-protection=pac-ret + else + KBUILD_CFLAGS += -msign-return-address=non-leaf + endif else -branch-prot-flags-$(CONFIG_CC_HAS_BRANCH_PROT_PAC_RET) := -mbranch-protection=$(PACRET-y) -endif + KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none) endif -KBUILD_CFLAGS += $(branch-prot-flags-y) - # Tell the assembler to support instructions from the latest target # architecture. # |