From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: [PATCH 02/31] arm64: KVM: Do not use stack-protector to compile EL2 code Date: Wed, 3 May 2017 11:45:37 +0100 Message-ID: <20170503104606.19342-3-marc.zyngier@arm.com> References: <20170503104606.19342-1-marc.zyngier@arm.com> Cc: David Daney , Catalin Marinas , Mark Rutland , Robert Richter , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org To: Christoffer Dall Return-path: Received: from foss.arm.com ([217.140.101.70]:53390 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752991AbdECKqX (ORCPT ); Wed, 3 May 2017 06:46:23 -0400 In-Reply-To: <20170503104606.19342-1-marc.zyngier@arm.com> Sender: kvm-owner@vger.kernel.org List-ID: 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 --- arch/arm64/kvm/hyp/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile index aaf42ae8d8c3..14c4e3b14bcb 100644 --- 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 -- 2.11.0