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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2018-12-12 13:08:44 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-12-12 18:45:31 +0000 |
| commit | 0a1213fa7432778b71a1c0166bf56660a3aab030 (patch) | |
| tree | ddf7b68d14a504fe97fbdefe00bf8a3296590cc5 /arch/arm64/Makefile | |
| parent | 4ab215061554ae2a4b78744a5dd3b3c6639f16a7 (diff) | |
| download | lwn-0a1213fa7432778b71a1c0166bf56660a3aab030.tar.gz lwn-0a1213fa7432778b71a1c0166bf56660a3aab030.zip | |
arm64: enable per-task stack canaries
This enables the use of per-task stack canary values if GCC has
support for emitting the stack canary reference relative to the
value of sp_el0, which holds the task struct pointer in the arm64
kernel.
The $(eval) extends KBUILD_CFLAGS at the moment the make rule is
applied, which means asm-offsets.o (which we rely on for the offset
value) is built without the arguments, and everything built afterwards
has the options set.
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/Makefile')
| -rw-r--r-- | arch/arm64/Makefile | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 8978f60779c4..398bdb81a900 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -56,6 +56,16 @@ KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) +ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y) +prepare: stack_protector_prepare +stack_protector_prepare: prepare0 + $(eval KBUILD_CFLAGS += -mstack-protector-guard=sysreg \ + -mstack-protector-guard-reg=sp_el0 \ + -mstack-protector-guard-offset=$(shell \ + awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}' \ + include/generated/asm-offsets.h)) +endif + ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) KBUILD_CPPFLAGS += -mbig-endian CHECKFLAGS += -D__AARCH64EB__ |