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Commit 04ca3204 authored by Mark Rutland's avatar Mark Rutland Committed by Will Deacon
Browse files

arm64: enable pointer authentication 



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: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarKristina Martsenko <kristina.martsenko@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent ba830885

arch/arm64/Kconfig

+23 −0
Original line number Diff line number Diff line
@@ -1260,6 +1260,29 @@ config ARM64_CNP 


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