From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17009C4332D for ; Thu, 19 Mar 2020 09:18:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E758620722 for ; Thu, 19 Mar 2020 09:18:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727604AbgCSJSC (ORCPT ); Thu, 19 Mar 2020 05:18:02 -0400 Received: from 8bytes.org ([81.169.241.247]:52340 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727341AbgCSJOf (ORCPT ); Thu, 19 Mar 2020 05:14:35 -0400 Received: by theia.8bytes.org (Postfix, from userid 1000) id 69580753; Thu, 19 Mar 2020 10:14:22 +0100 (CET) From: Joerg Roedel To: x86@kernel.org Cc: hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Thomas Hellstrom , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , Kees Cook , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, Joerg Roedel , Joerg Roedel Subject: [PATCH 33/70] x86/head/64: Build k/head64.c with -fno-stack-protector Date: Thu, 19 Mar 2020 10:13:30 +0100 Message-Id: <20200319091407.1481-34-joro@8bytes.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200319091407.1481-1-joro@8bytes.org> References: <20200319091407.1481-1-joro@8bytes.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Joerg Roedel The code inserted by the stack protector does not work in the early boot environment because it uses the GS segment, at least with memory encryption enabled. Make sure the early code is compiled without this feature enabled. Signed-off-by: Joerg Roedel --- arch/x86/kernel/Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 9b294c13809a..9b0ebcf4b9f3 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -36,6 +36,10 @@ ifdef CONFIG_FRAME_POINTER OBJECT_FILES_NON_STANDARD_ftrace_$(BITS).o := y endif +# make sure head64.c is built without stack protector +nostackp := $(call cc-option, -fno-stack-protector) +CFLAGS_head64.o := $(nostackp) + # If instrumentation of this dir is enabled, boot hangs during first second. # Probably could be more selective here, but note that files related to irqs, # boot, dumpstack/stacktrace, etc are either non-interesting or can lead to -- 2.17.1