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=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 2DD13C43381 for ; Wed, 10 Feb 2021 18:13:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 07D1764EE1 for ; Wed, 10 Feb 2021 18:13:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234079AbhBJSM6 (ORCPT ); Wed, 10 Feb 2021 13:12:58 -0500 Received: from mga18.intel.com ([134.134.136.126]:40699 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233863AbhBJSDs (ORCPT ); Wed, 10 Feb 2021 13:03:48 -0500 IronPort-SDR: ERM9dQt0ianQW+jSzMZJga3HoenOJP39LRXXXI9aYoDJX1LxrDw4JQXd6RkKIa1PfAKYbYQ1Ym LluO4T9pl5Ew== X-IronPort-AV: E=McAfee;i="6000,8403,9891"; a="169798855" X-IronPort-AV: E=Sophos;i="5.81,168,1610438400"; d="scan'208";a="169798855" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Feb 2021 10:02:58 -0800 IronPort-SDR: pacCmvBGgYJuU2TRsHEL4HzHrcWMu8r+YZHNwmSBXKEWdxAM9zUzXU5JnfyR1rbd1NEVvKKh8T VIo3qq7YRTeA== X-IronPort-AV: E=Sophos;i="5.81,168,1610438400"; d="scan'208";a="380239221" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Feb 2021 10:02:57 -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 v20 5/7] x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking Date: Wed, 10 Feb 2021 10:02:43 -0800 Message-Id: <20210210180245.13770-6-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210210180245.13770-1-yu-cheng.yu@intel.com> References: <20210210180245.13770-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "H.J. Lu" Update ARCH_X86_CET_STATUS and ARCH_X86_CET_DISABLE for Indirect Branch Tracking. Signed-off-by: H.J. Lu Signed-off-by: Yu-cheng Yu Reviewed-by: Kees Cook --- arch/x86/kernel/cet_prctl.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kernel/cet_prctl.c b/arch/x86/kernel/cet_prctl.c index 0030c63a08c0..4df1eac41965 100644 --- a/arch/x86/kernel/cet_prctl.c +++ b/arch/x86/kernel/cet_prctl.c @@ -22,6 +22,9 @@ static int cet_copy_status_to_user(struct cet_status *cet, u64 __user *ubuf) buf[2] = cet->shstk_size; } + if (cet->ibt_enabled) + buf[0] |= GNU_PROPERTY_X86_FEATURE_1_IBT; + return copy_to_user(ubuf, buf, sizeof(buf)); } @@ -46,6 +49,8 @@ int prctl_cet(int option, u64 arg2) return -EINVAL; if (arg2 & GNU_PROPERTY_X86_FEATURE_1_SHSTK) cet_disable_shstk(); + if (arg2 & GNU_PROPERTY_X86_FEATURE_1_IBT) + cet_disable_ibt(); return 0; case ARCH_X86_CET_LOCK: -- 2.21.0