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 1A6D6C43462 for ; Thu, 15 Apr 2021 22:18:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E6C2A610F7 for ; Thu, 15 Apr 2021 22:18:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237471AbhDOWTV (ORCPT ); Thu, 15 Apr 2021 18:19:21 -0400 Received: from mga07.intel.com ([134.134.136.100]:58105 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236592AbhDOWSn (ORCPT ); Thu, 15 Apr 2021 18:18:43 -0400 IronPort-SDR: dZ2pRYUkvApT04KnXs1L6Ijnv/GFrF4mZkYGKcO8WdoFc3ejFewZINW2Flej4ywXTOBM4zwwD8 yPzIdV4jOhyg== X-IronPort-AV: E=McAfee;i="6200,9189,9955"; a="258913080" X-IronPort-AV: E=Sophos;i="5.82,225,1613462400"; d="scan'208";a="258913080" 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 15:17:48 -0700 IronPort-SDR: yPlDklI+Eod47uSPwqiYFjUDQrQ2CSDQUeI1ArJxsVMWx0Hpm4e1a2eJC4EMzHPy6g03aRGxwx QGAaW8I4AQBg== X-IronPort-AV: E=Sophos;i="5.82,225,1613462400"; d="scan'208";a="399720976" 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 5/9] x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking Date: Thu, 15 Apr 2021 15:17:30 -0700 Message-Id: <20210415221734.32628-6-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 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 --- v24: - Update for function name changes from splitting shadow stack and ibt. 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 3bb9f32ca70d..ab05597545c5 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) shstk_disable(); + if (arg2 & GNU_PROPERTY_X86_FEATURE_1_IBT) + ibt_disable(); return 0; case ARCH_X86_CET_LOCK: -- 2.21.0