From: Marc Zyngier <marc.zyngier@arm.com>
Date: Tue, 2 May 2017 13:30:38 +0000 (+0100)
Subject: arm: KVM: Do not use stack-protector to compile HYP code
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=501ad27c67ed0b90df465f23d33e9aed64058a47;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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

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.

Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
---

diff --git a/arch/arm/kvm/hyp/Makefile b/arch/arm/kvm/hyp/Makefile
index 3023bb530edf..8679405b0b2b 100644
--- 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