arm64: KVM: Do not use stack-protector to compile EL2 code
authorMarc Zyngier <marc.zyngier@arm.com>
Tue, 2 May 2017 13:30:37 +0000 (14:30 +0100)
committerChristoffer Dall <cdall@linaro.org>
Mon, 15 May 2017 09:31:16 +0000 (11:31 +0200)
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.

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>
arch/arm64/kvm/hyp/Makefile

index aaf42ae8d8c31395d63590289e55798073bc99a4..14c4e3b14bcb6f59a6de55db07de9cc8457be8ec 100644 (file)
@@ -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