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 A98C7C47427 for ; Fri, 25 Sep 2020 14:58:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C6A421D42 for ; Fri, 25 Sep 2020 14:58:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729251AbgIYO6r (ORCPT ); Fri, 25 Sep 2020 10:58:47 -0400 Received: from mga07.intel.com ([134.134.136.100]:47925 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729135AbgIYO6Q (ORCPT ); Fri, 25 Sep 2020 10:58:16 -0400 IronPort-SDR: dc34RPhitu+vI7aGPkqFnhHlmKsFvzMZuNU0fE9mpbnvdxkx91Oj2onpgRxTAcpLjRjgwInJEr zx2tQs7bc2ng== X-IronPort-AV: E=McAfee;i="6000,8403,9755"; a="225704492" X-IronPort-AV: E=Sophos;i="5.77,302,1596524400"; d="scan'208";a="225704492" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 07:58:14 -0700 IronPort-SDR: 7xOXXexJwcxygu2Xzf9kweeyko7guPmI7zayEU+/z/sFyyGLF5H8l7arDdhOPWAfCnfgh1GqEA cAz+Z87qiLRg== X-IronPort-AV: E=Sophos;i="5.77,302,1596524400"; d="scan'208";a="512916975" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Sep 2020 07:58:14 -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 Cc: Yu-cheng Yu Subject: [PATCH v13 5/8] x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking Date: Fri, 25 Sep 2020 07:58:01 -0700 Message-Id: <20200925145804.5821-6-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200925145804.5821-1-yu-cheng.yu@intel.com> References: <20200925145804.5821-1-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 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 --- arch/x86/kernel/cet_prctl.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cet_prctl.c b/arch/x86/kernel/cet_prctl.c index bd5ad11763e4..0af1ec5d028f 100644 --- a/arch/x86/kernel/cet_prctl.c +++ b/arch/x86/kernel/cet_prctl.c @@ -22,6 +22,9 @@ static int copy_status_to_user(struct cet_status *cet, u64 arg2) buf[2] = (u64)cet->shstk_size; } + if (cet->ibt_enabled) + buf[0] |= GNU_PROPERTY_X86_FEATURE_1_IBT; + return copy_to_user((u64 __user *)arg2, buf, sizeof(buf)); } @@ -42,7 +45,8 @@ int prctl_cet(int option, u64 arg2) if (option == ARCH_X86_CET_STATUS) return copy_status_to_user(cet, arg2); - if (!static_cpu_has(X86_FEATURE_SHSTK)) + if (!static_cpu_has(X86_FEATURE_SHSTK) && + !static_cpu_has(X86_FEATURE_IBT)) return -EOPNOTSUPP; switch (option) { @@ -56,6 +60,8 @@ int prctl_cet(int option, u64 arg2) return -EINVAL; if (features & GNU_PROPERTY_X86_FEATURE_1_SHSTK) cet_disable_shstk(); + if (features & GNU_PROPERTY_X86_FEATURE_1_IBT) + cet_disable_ibt(); return 0; case ARCH_X86_CET_LOCK: -- 2.21.0