[RFC 17/17] arm64: compile the kernel with ptrauth -msign-return-address
From: Vladimir Murzin <hidden>
Date: 2018-10-11 14:23:11
Also in:
kvmarm, linux-arch, lkml
Hi Kristina, On 05/10/18 09:47, Kristina Martsenko wrote:
quoted hunk ↗ jump to hunk
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 +endif
Should not it be done via cc-option so old toolchains keep working [1]? [1] $ aarch64-linux-gnu-gcc --version aarch64-linux-gnu-gcc (Linaro GCC 2014.11) 4.9.3 20141031 (prerelease) Copyright (C) 2014 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ aarch64-linux-gnu-gcc -msign-return-address=all aarch64-linux-gnu-gcc: error: unrecognized command line option '-msign-return-address=all' ... Cheers Vladimir