@@ -1127,6 +1127,29 @@ config ARM64_RAS_EXTN
endmenu
+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.
+
+endmenu
+
config ARM64_SVE
bool "ARM Scalable Vector Extension support"
default y
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(+)