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=-12.8 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 07E85C433DF for ; Tue, 25 Aug 2020 00:32:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E24E7206EB for ; Tue, 25 Aug 2020 00:32:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728474AbgHYAai (ORCPT ); Mon, 24 Aug 2020 20:30:38 -0400 Received: from mga01.intel.com ([192.55.52.88]:28753 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728396AbgHYAaf (ORCPT ); Mon, 24 Aug 2020 20:30:35 -0400 IronPort-SDR: SfDDIo80oKs8UwGVqvPxp7Yri6qYd+W8k7tuveWlFvvsd93meiFBqUawJaehvKcXXKMP8kPSFI y7IA1dDb3Vmg== X-IronPort-AV: E=McAfee;i="6000,8403,9723"; a="174053259" X-IronPort-AV: E=Sophos;i="5.76,350,1592895600"; d="scan'208";a="174053259" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 17:30:33 -0700 IronPort-SDR: l8S+XyV+DgtG/kfo6YnlQsapzXqJUuZ7pa5XjdDLqLaT6tRrTlHIWMt8wZ27Z0o1fWuRDt3VFq 8nW7rO4TwQcg== X-IronPort-AV: E=Sophos;i="5.76,350,1592895600"; d="scan'208";a="443429296" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 17:30:33 -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 Cc: Yu-cheng Yu Subject: [PATCH v11 1/9] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking Date: Mon, 24 Aug 2020 17:26:36 -0700 Message-Id: <20200825002645.3658-2-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200825002645.3658-1-yu-cheng.yu@intel.com> References: <20200825002645.3658-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-arch-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org Introduce Kconfig option X86_INTEL_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 --- v10: - Change build-time CET check to config depends on. arch/x86/Kconfig | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 6b6dad011763..b047e0a8d1c2 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1963,6 +1963,22 @@ config X86_INTEL_SHADOW_STACK_USER If unsure, say y. +config X86_INTEL_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_INTEL_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. + + If unsure, say y + config EFI bool "EFI runtime service support" depends on ACPI -- 2.21.0