This is a note to let you know that I've just added the patch titled
arm64: KVM: Do not use stack-protector to compile EL2 code
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-kvm-do-not-use-stack-protector-to-compile-el2-code.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cde13b5dad60471886a3bccb4f4134c647c4a9dc Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@xxxxxxx>
Date: Tue, 2 May 2017 14:30:37 +0100
Subject: arm64: KVM: Do not use stack-protector to compile EL2 code
From: Marc Zyngier <marc.zyngier@xxxxxxx>
commit cde13b5dad60471886a3bccb4f4134c647c4a9dc upstream.
We like living dangerously. Nothing explicitely forbids stack-protector
to be used in the EL2 code, while distributions routinely compile their
kernel with it. We're just lucky that no code actually triggers the
instrumentation.
Let's not try our luck for much longer, and disable stack-protector
for code living at EL2.
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Acked-by: Christoffer Dall <cdall@xxxxxxxxxx>
Signed-off-by: Christoffer Dall <cdall@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kvm/hyp/Makefile | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/arm64/kvm/hyp/Makefile
+++ b/arch/arm64/kvm/hyp/Makefile
@@ -2,6 +2,8 @@
# Makefile for Kernel-based Virtual Machine module, HYP part
#
+ccflags-y += -fno-stack-protector
+
KVM=../../../../virt/kvm
obj-$(CONFIG_KVM_ARM_HOST) += $(KVM)/arm/hyp/vgic-v2-sr.o
Patches currently in stable-queue which might be from marc.zyngier@xxxxxxx are
queue-4.9/arm64-kvm-do-not-use-stack-protector-to-compile-el2-code.patch
queue-4.9/arm-kvm-do-not-use-stack-protector-to-compile-hyp-code.patch
queue-4.9/kvm-arm-arm64-vgic-v3-do-not-use-active-pending-state-for-a-hw-interrupt.patch
queue-4.9/kvm-arm-arm64-vgic-v2-do-not-use-active-pending-state-for-a-hw-interrupt.patch