Messages in this thread Patch in this message | | | From | Kristina Martsenko <> | Subject | [PATCH v5 10/17] arm64: enable pointer authentication | Date | Fri, 5 Oct 2018 09:47:47 +0100 |
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From: Mark Rutland <mark.rutland@arm.com>
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> --- arch/arm64/Kconfig | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 1b1a0e95c751..8a6d44160fa8 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1134,6 +1134,29 @@ 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 -- 2.11.0
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