Date: Tue, 17 Apr 2018 19:37:34 +0100 From: Mark Rutland <mark.rutland@....com> To: linux-arm-kernel@...ts.infradead.org Cc: arnd@...db.de, catalin.marinas@....com, cdall@...nel.org, drjones@...hat.com, kvmarm@...ts.cs.columbia.edu, linux-arch@...r.kernel.org, marc.zyngier@....com, mark.rutland@....com, ramana.radhakrishnan@....com, suzuki.poulose@....com, will.deacon@....com, linux-kernel@...r.kernel.org, awallis@...eaurora.org, kernel-hardening@...ts.openwall.com Subject: [PATCHv3 10/11] 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@....com> Cc: Catalin Marinas <catalin.marinas@....com> Cc: Will Deacon <will.deacon@....com> --- arch/arm64/Kconfig | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) 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 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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