[PATCH v4 25/36] arm64: Add Kconfig for Guarded Control Stack (GCS)
From: Mark Brown <broonie@kernel.org>
Date: 2023-08-07 22:06:15
Also in:
kvmarm, linux-arch, linux-arm-kernel, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Provide a Kconfig option allowing the user to select if GCS support is built into the kernel. Signed-off-by: Mark Brown <broonie@kernel.org> --- arch/arm64/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a2511b30d0f6..b5ef1a698770 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -2093,6 +2093,25 @@ config ARM64_EPAN if the cpu does not implement the feature. endmenu # "ARMv8.7 architectural features" +menu "v9.4 architectural features" + +config ARM64_GCS + bool "Enable support for Guarded Control Stack (GCS)" + default y + select ARCH_USES_HIGH_VMA_FLAGS + help + Guarded Control Stack (GCS) provides support for a separate + stack with restricted access which contains only return + addresses. This can be used to harden against some attacks + by comparing return address used by the program with what is + stored in the GCS, and may also be used to efficiently obtain + the call stack for applications such as profiling. + + The feature is detected at runtime, and will remain disabled + if the system does not implement the feature. + +endmenu # "v9.4 architectural features" + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y
--
2.30.2