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authorArd Biesheuvel <ardb@kernel.org>2021-09-18 10:44:34 +0200
committerArd Biesheuvel <ardb@kernel.org>2021-09-27 16:54:01 +0200
commitdfbdcda280eb762bae2184145cc0702932d41798 (patch)
tree412a5d96995d2b0cb4d41409dd51476e3a7da8ea /arch/arm/Makefile
parent6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f (diff)
gcc-plugins: arm-ssp: Prepare for THREAD_INFO_IN_TASK support
We will be enabling THREAD_INFO_IN_TASK support for ARM, which means that we can no longer load the stack canary value by masking the stack pointer and taking the copy that lives in thread_info. Instead, we will be able to load it from the task_struct directly, by using the TPIDRURO register which will hold the current task pointer when THREAD_INFO_IN_TASK is in effect. This is much more straight-forward, and allows us to declutter this code a bit while at it. Note that this means that ARMv6 (non-v6K) SMP systems can no longer use this feature, but those are quite rare to begin with, so this is a reasonable trade off. Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Diffstat (limited to 'arch/arm/Makefile')
-rw-r--r--arch/arm/Makefile5
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 847c31e7c368..b46e673a0ebe 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -273,11 +273,8 @@ ifeq ($(CONFIG_STACKPROTECTOR_PER_TASK),y)
prepare: stack_protector_prepare
stack_protector_prepare: prepare0
$(eval SSP_PLUGIN_CFLAGS := \
- -fplugin-arg-arm_ssp_per_task_plugin-tso=$(shell \
- awk '{if ($$2 == "THREAD_SZ_ORDER") print $$3;}'\
- include/generated/asm-offsets.h) \
-fplugin-arg-arm_ssp_per_task_plugin-offset=$(shell \
- awk '{if ($$2 == "TI_STACK_CANARY") print $$3;}'\
+ awk '{if ($$2 == "TSK_STACK_CANARY") print $$3;}'\
include/generated/asm-offsets.h))
$(eval KBUILD_CFLAGS += $(SSP_PLUGIN_CFLAGS))
$(eval GCC_PLUGINS_CFLAGS += $(SSP_PLUGIN_CFLAGS))