[PATCHv2 11/12] arm64: enable pointer authentication
From: mark.rutland@arm.com (Mark Rutland)
Date: 2017-11-27 16:39:53
Also in:
kvmarm, linux-arch, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Now that all the necessary bits are in place for userspace / KVM guest pointer authentication, add the necessary Kconfig logic to allow this to be enabled. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <redacted> --- arch/arm64/Kconfig | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index a93339f5178f..f7cb4ca8a6fc 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -1013,6 +1013,29 @@ config ARM64_PMEM endmenu +menu "ARMv8.3 architectural features" + +config ARM64_POINTER_AUTHENTICATION + bool "Enable support for pointer authentication" + default y + help + Pointer authentication (part of the ARMv8.3 Extensions) provides + instructions for signing and authenticating pointers against secret + keys, which can be used to mitigate Return Oriented Programming (ROP) + and other attacks. + + This option enables these instructions at EL0 (i.e. for userspace). + + Choosing this option will cause the kernel to initialise secret keys + for each process at exec() time, with these keys being + context-switched along with the process. + + The feature is detected at runtime. If the feature is not present in + hardware it will not be advertised to userspace nor will it be + enabled. + +endmenu + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y
--
2.11.0