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 262D8C4167B for ; Wed, 9 Dec 2020 22:31:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 03B5623D20 for ; Wed, 9 Dec 2020 22:31:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388915AbgLIW3z (ORCPT ); Wed, 9 Dec 2020 17:29:55 -0500 Received: from mga01.intel.com ([192.55.52.88]:7773 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388829AbgLIW3w (ORCPT ); Wed, 9 Dec 2020 17:29:52 -0500 IronPort-SDR: O9OkoIBhSO0lzy8pmQ6JDHaKLyW4d+Z5gUHfQPwy7z2tO34QKjX2AandJzMFOueSiuFVI1JUU1 QpMiNLR526fQ== X-IronPort-AV: E=McAfee;i="6000,8403,9830"; a="192468363" X-IronPort-AV: E=Sophos;i="5.78,407,1599548400"; d="scan'208";a="192468363" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2020 14:28:12 -0800 IronPort-SDR: IZarz+11qB9wZSjaBifLQa7qBG52MoFKZ7hcqq93VjK4hTHgyv6MAhy69nMMXedqn3c4crG0jU CdUxHzev0Cbg== X-IronPort-AV: E=Sophos;i="5.78,407,1599548400"; d="scan'208";a="364333627" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2020 14:28:12 -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 v16 4/7] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking Date: Wed, 9 Dec 2020 14:27:49 -0800 Message-Id: <20201209222752.2911-5-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20201209222752.2911-1-yu-cheng.yu@intel.com> References: <20201209222752.2911-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org An ELF file's .note.gnu.property indicates features the file supports. The property is parsed at loading time and passed to arch_setup_elf_ property(). Update it for Indirect Branch Tracking. Signed-off-by: Yu-cheng Yu --- arch/x86/kernel/process_64.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 2586745b2392..bf3d38394edf 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -866,6 +866,14 @@ int arch_setup_elf_property(struct arch_elf_state *state) r = cet_setup_shstk(); } + if (r < 0) + return r; + + if (static_cpu_has(X86_FEATURE_IBT)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_IBT) + r = cet_setup_ibt(); + } + return r; } #endif -- 2.21.0