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Message-Id: <20180417183735.56985-11-mark.rutland@arm.com>
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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