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[PATCHv4,09/10] arm64: enable pointer authentication

Message ID 20180503132031.25705-10-mark.rutland@arm.com
State New
Headers show
Series ARMv8.3 pointer authentication userspace support | expand

Commit Message

Mark Rutland May 3, 2018, 1:20 p.m. UTC
Now that all the necessary bits are in place for userspace, add the
necessary Kconfig logic to allow this to be enabled.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
 arch/arm64/Kconfig | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

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diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index eb2cf4938f6d..d6ce16b1ee47 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1127,6 +1127,29 @@  config ARM64_RAS_EXTN
+menu "ARMv8.3 architectural features"
+config ARM64_PTR_AUTH
+	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.
 config ARM64_SVE
 	bool "ARM Scalable Vector Extension support"
 	default y