From patchwork Tue Mar 16 15:13:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu-cheng Yu X-Patchwork-Id: 12142445 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=-16.8 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=ham 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 6EFD5C433E6 for ; Tue, 16 Mar 2021 15:13:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 17FDE650B1 for ; Tue, 16 Mar 2021 15:13:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 17FDE650B1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D2F9D8D000D; Tue, 16 Mar 2021 11:13:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CDF678D000E; Tue, 16 Mar 2021 11:13:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B80F48D000D; Tue, 16 Mar 2021 11:13:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0093.hostedemail.com [216.40.44.93]) by kanga.kvack.org (Postfix) with ESMTP id 9335F8D0002 for ; Tue, 16 Mar 2021 11:13:39 -0400 (EDT) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id D01013ABC for ; Tue, 16 Mar 2021 15:13:36 +0000 (UTC) X-FDA: 77926081674.24.3BD6FE0 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by imf19.hostedemail.com (Postfix) with ESMTP id 23AF590009EF for ; Tue, 16 Mar 2021 15:13:31 +0000 (UTC) IronPort-SDR: ulUUwVOJK14ZqVjHPo33gcp0CZVz3wdDgwFBlqSmRLaFOgkLXTQs9IeIuu6EbJ0r0tSB4iv8s7 wYFEDS97nEog== X-IronPort-AV: E=McAfee;i="6000,8403,9924"; a="209213122" X-IronPort-AV: E=Sophos;i="5.81,251,1610438400"; d="scan'208";a="209213122" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Mar 2021 08:13:29 -0700 IronPort-SDR: 8n/K6qndfmpzOS2rbaobdhZlkA/nM0/tV3a3VKvhGc/MkATFURCloTHVWZFrrtMead7wDTeU4D pTYAO1jApIIA== X-IronPort-AV: E=Sophos;i="5.81,251,1610438400"; d="scan'208";a="449748989" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Mar 2021 08:13:28 -0700 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 , Haitao Huang Cc: Yu-cheng Yu Subject: [PATCH v23 4/9] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking Date: Tue, 16 Mar 2021 08:13:14 -0700 Message-Id: <20210316151320.6123-5-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210316151320.6123-1-yu-cheng.yu@intel.com> References: <20210316151320.6123-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Stat-Signature: 94tbzhfaq5i4qpuoxg7kgtu5s8mhhfb8 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 23AF590009EF Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf19; identity=mailfrom; envelope-from=""; helo=mga01.intel.com; client-ip=192.55.52.88 X-HE-DKIM-Result: none/none X-HE-Tag: 1615907611-414825 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 Reviewed-by: Kees Cook --- 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 cda830b0f7ee..11497689a841 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -864,6 +864,14 @@ 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