Patch "arm: KVM: Do not use stack-protector to compile HYP code" has been added to the 4.11-stable tree

Patch "arm: KVM: Do not use stack-protector to compile HYP code" has been added to the 4.11-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm: KVM: Do not use stack-protector to compile HYP code

to the 4.11-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:
     arm-kvm-do-not-use-stack-protector-to-compile-hyp-code.patch
and it can be found in the queue-4.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 501ad27c67ed0b90df465f23d33e9aed64058a47 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@arm.com>
Date: Tue, 2 May 2017 14:30:38 +0100
Subject: arm: KVM: Do not use stack-protector to compile HYP code

From: Marc Zyngier <marc.zyngier@arm.com>

commit 501ad27c67ed0b90df465f23d33e9aed64058a47 upstream.

We like living dangerously. Nothing explicitely forbids stack-protector
to be used in the HYP 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 HYP.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm/kvm/hyp/Makefile |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/arm/kvm/hyp/Makefile
+++ b/arch/arm/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@arm.com are

queue-4.11/arm64-kvm-do-not-use-stack-protector-to-compile-el2-code.patch
queue-4.11/arm-kvm-do-not-use-stack-protector-to-compile-hyp-code.patch
queue-4.11/kvm-arm-arm64-vgic-v3-do-not-use-active-pending-state-for-a-hw-interrupt.patch
queue-4.11/kvm-arm-arm64-vgic-v2-do-not-use-active-pending-state-for-a-hw-interrupt.patch