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=-16.8 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 039E1C433B4 for ; Thu, 15 Apr 2021 22:18:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD8F6610FC for ; Thu, 15 Apr 2021 22:18:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237264AbhDOWTT (ORCPT ); Thu, 15 Apr 2021 18:19:19 -0400 Received: from mga07.intel.com ([134.134.136.100]:58099 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236720AbhDOWSn (ORCPT ); Thu, 15 Apr 2021 18:18:43 -0400 IronPort-SDR: IWFAZRXF+w5ZW6hoezdBr2qXymdJXYY1oetH1iraJ+DbdRQLN5eVcOMbNXDl9B6/ZbfZZACs6E 66SFnEXsysug== X-IronPort-AV: E=McAfee;i="6200,9189,9955"; a="258913077" X-IronPort-AV: E=Sophos;i="5.82,225,1613462400"; d="scan'208";a="258913077" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Apr 2021 15:17:47 -0700 IronPort-SDR: 3IMNX+yuGmMEk6PlTGkiU8Z3eabK0IxEd5mfuLEe+wjBb+sdyhAmgubnETlVNfa+Pn94UszWqS 6jBmVOOkFv/Q== X-IronPort-AV: E=Sophos;i="5.82,225,1613462400"; d="scan'208";a="399720971" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Apr 2021 15:17:47 -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 v25 4/9] x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking Date: Thu, 15 Apr 2021 15:17:29 -0700 Message-Id: <20210415221734.32628-5-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210415221734.32628-1-yu-cheng.yu@intel.com> References: <20210415221734.32628-1-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 Cc: Kees Cook --- v24: - Update for splitting shadow stack and ibt. arch/x86/Kconfig | 2 ++ arch/x86/kernel/process_64.c | 8 ++++++++ 2 files changed, 10 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6bb69fba0dad..7436e3a608e8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1970,6 +1970,8 @@ config X86_IBT def_bool n depends on X86_SHADOW_STACK depends on $(cc-option,-fcf-protection) + select ARCH_USE_GNU_PROPERTY + select ARCH_BINFMT_ELF_STATE help Indirect Branch Tracking (IBT) provides protection against CALL-/JMP-oriented programming attacks. It is active when diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index d71045b29475..bf8ef10e5b78 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 = shstk_setup(); } + if (r < 0) + return r; + + if (cpu_feature_enabled(X86_FEATURE_IBT)) { + if (state->gnu_property & GNU_PROPERTY_X86_FEATURE_1_IBT) + r = ibt_setup(); + } + return r; } #endif -- 2.21.0