From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751613AbeECNVb (ORCPT ); Thu, 3 May 2018 09:21:31 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:41686 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751121AbeECNVE (ORCPT ); Thu, 3 May 2018 09:21:04 -0400 From: Mark Rutland To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, catalin.marinas@arm.com, christoffer.dall@arm.com, drjones@redhat.com, marc.zyngier@arm.com, mark.rutland@arm.com, ramana.radhakrishnan@arm.com, suzuki.poulose@arm.com, will.deacon@arm.com, awallis@codeaurora.org Subject: [PATCHv4 09/10] arm64: enable pointer authentication Date: Thu, 3 May 2018 14:20:30 +0100 Message-Id: <20180503132031.25705-10-mark.rutland@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180503132031.25705-1-mark.rutland@arm.com> References: <20180503132031.25705-1-mark.rutland@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 Cc: Catalin Marinas Cc: Will Deacon --- 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