On 05/10/2018 09:47, Kristina Martsenko wrote:
Compile all functions with two ptrauth instructions: paciasp in the
prologue to sign the return address, and autiasp in the epilogue to
authenticate the return address. This should help protect the kernel
against attacks using return-oriented programming.
CONFIG_ARM64_PTR_AUTH enables pointer auth for both userspace and the
kernel.
Signed-off-by: Mark Rutland <[email protected]>
Signed-off-by: Kristina Martsenko <[email protected]>
---
arch/arm64/Makefile | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index 106039d25e2f..dbcd43ea99d8 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -56,6 +56,10 @@ KBUILD_AFLAGS += $(lseinstr) $(brokengasinst)
KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
+ifeq ($(CONFIG_ARM64_PTR_AUTH),y)
+KBUILD_CFLAGS += -msign-return-address=all
Glad to see this being done and being proposed for mainline.
I can see why you would prefer this though have you guys experimented at
all with -msign-return-address=non-leaf as well ?
Orthogonally and just fair warning - the command lines for this are also
being revised to provide ROP and JOP protection using BTI from v8.5-a
during the GCC-9 timeframe but I suspect that's a different option.
regards
Ramana
Reviewed-by: Ramana Radhakrishnan <[email protected]>
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