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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: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Mark Rutland 2018-12-07 18:39:30 +00:00 committed by Will Deacon
parent ba83088565
commit 04ca3204fa
1 changed files with 23 additions and 0 deletions
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23
arch/arm64/Kconfig
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@ -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