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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 CD88BC43381 for ; Wed, 27 Jan 2021 21:38:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CE046146D for ; Wed, 27 Jan 2021 21:38:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232453AbhA0Vh6 (ORCPT ); Wed, 27 Jan 2021 16:37:58 -0500 Received: from mga12.intel.com ([192.55.52.136]:11286 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236004AbhA0Vfv (ORCPT ); Wed, 27 Jan 2021 16:35:51 -0500 IronPort-SDR: Q+06Glvzc1E/0lMjvpmYmlvBqUFObMVxVCbBRll415bn3JARIDL8p/WviARVYCWPwQrw6ABYAy lUl8D4Snj7dg== X-IronPort-AV: E=McAfee;i="6000,8403,9877"; a="159309017" X-IronPort-AV: E=Sophos;i="5.79,380,1602572400"; d="scan'208";a="159309017" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2021 13:30:37 -0800 IronPort-SDR: lb9omYTnY/cRYmQMmRl21iuEBjTaAtWgm0yPiuk/B3eNUYBfRYwmqN6c8feKFQp+RXBLs+HPft Tqu5MsdkkEmQ== X-IronPort-AV: E=Sophos;i="5.79,380,1602572400"; d="scan'208";a="362581357" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jan 2021 13:30:36 -0800 From: Yu-cheng Yu To: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang , Pengfei Xu Cc: Yu-cheng Yu Subject: [PATCH v18 1/7] x86/cet/ibt: Update Kconfig for user-mode Indirect Branch Tracking Date: Wed, 27 Jan 2021 13:30:22 -0800 Message-Id: <20210127213028.11362-2-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210127213028.11362-1-yu-cheng.yu@intel.com> References: <20210127213028.11362-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org Indirect branch tracking is a hardware security feature that verifies near indirect call/jump instructions arrive at intended targets, which are labeled by the compiler with ENDBR opcodes. If such instructions reach unlabeled locations, the processor raises control-protection faults. Check the compiler is up-to-date at config time. Signed-off-by: Yu-cheng Yu --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index aec4c988a5ae..b3d2b821ec10 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1962,6 +1962,7 @@ config X86_CET def_bool n depends on CPU_SUP_INTEL && X86_64 depends on AS_WRUSS + depends on $(cc-option,-fcf-protection) select ARCH_USES_HIGH_VMA_FLAGS select ARCH_HAS_SHADOW_STACK select ARCH_MAYBE_MKWRITE -- 2.21.0