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=-12.7 required=3.0 tests=BAYES_00, 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 4BC2FC388F7 for ; Tue, 10 Nov 2020 16:25:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05A1D20809 for ; Tue, 10 Nov 2020 16:25:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726984AbgKJQZo (ORCPT ); Tue, 10 Nov 2020 11:25:44 -0500 Received: from mga12.intel.com ([192.55.52.136]:63836 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732692AbgKJQZE (ORCPT ); Tue, 10 Nov 2020 11:25:04 -0500 IronPort-SDR: Q1S40emYboo5a7rNz9pWx9+yr0OcMoZ1K7307Cb/MMWGHTY7hwC4Yd8VBZy5zRYNev0ZP3ZUyD 0CFEa60Srflg== X-IronPort-AV: E=McAfee;i="6000,8403,9801"; a="149278315" X-IronPort-AV: E=Sophos;i="5.77,466,1596524400"; d="scan'208";a="149278315" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Nov 2020 08:25:02 -0800 IronPort-SDR: xU1nkYA8Tc0c0rIi1q6hQkbJtcav6IxZCYXq5ghL1g5nKJxdopVPW+GVZqL719+oorBvQeXE6a 8eiU9sYRyzvw== X-IronPort-AV: E=Sophos;i="5.77,466,1596524400"; d="scan'208";a="308469029" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Nov 2020 08:25:02 -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 v15 1/7] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking Date: Tue, 10 Nov 2020 08:24:42 -0800 Message-Id: <20201110162448.9846-2-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20201110162448.9846-1-yu-cheng.yu@intel.com> References: <20201110162448.9846-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org Introduce Kconfig option X86_BRANCH_TRACKING_USER. Indirect Branch Tracking (IBT) provides protection against CALL-/JMP- oriented programming attacks. It is active when the kernel has this feature enabled, and the processor and the application support it. When this feature is enabled, legacy non-IBT applications continue to work, but without IBT protection. Signed-off-by: Yu-cheng Yu --- arch/x86/Kconfig | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 18fd8cb549ad..e27f0c19a4b3 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1969,6 +1969,25 @@ config X86_SHADOW_STACK_USER If unsure, say N. +config X86_BRANCH_TRACKING_USER + prompt "Intel Indirect Branch Tracking for user-mode" + def_bool n + depends on CPU_SUP_INTEL && X86_64 + depends on $(cc-option,-fcf-protection) + select X86_CET + help + Indirect Branch Tracking (IBT) provides protection against + CALL-/JMP-oriented programming attacks. It is active when + the kernel has this feature enabled, and the processor and + the application support it. When this feature is enabled, + legacy non-IBT applications continue to work, but without + IBT protection. + Support for this feature is only known to be present on + processors released in 2020 or later. CET features are also + known to increase kernel text size by 3.7 KB. + + If unsure, say N. + config EFI bool "EFI runtime service support" depends on ACPI -- 2.21.0