From patchwork Tue Apr 27 20:47:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yu-cheng Yu X-Patchwork-Id: 12227315 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=ham 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 BA835C43461 for ; Tue, 27 Apr 2021 20:47:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5F2D061006 for ; Tue, 27 Apr 2021 20:47:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5F2D061006 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 294576B00B2; Tue, 27 Apr 2021 16:47:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 224716B00B1; Tue, 27 Apr 2021 16:47:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F1A736B00B5; Tue, 27 Apr 2021 16:47:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0144.hostedemail.com [216.40.44.144]) by kanga.kvack.org (Postfix) with ESMTP id A19D36B00B1 for ; Tue, 27 Apr 2021 16:47:51 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 683AA180AD81D for ; Tue, 27 Apr 2021 20:47:51 +0000 (UTC) X-FDA: 78079333542.05.2A96054 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by imf14.hostedemail.com (Postfix) with ESMTP id 82FCDC0007E3 for ; Tue, 27 Apr 2021 20:47:35 +0000 (UTC) IronPort-SDR: Jg9i9eUmVEqqogNOYwf/4RGBWrIAcA1hLpn6CUbVezDXiUUw26Ni6wO4BYHX/iecJnLV3WyCiW IrcxOtRhRELA== X-IronPort-AV: E=McAfee;i="6200,9189,9967"; a="176706719" X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="176706719" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2021 13:47:47 -0700 IronPort-SDR: ZJLrSBbSRJuTYagjrCFfM3ti+f2Obbsudc8GHCim9z3MOQzNlG42ypfvQuFU7lXF7/I5kIRL7P tcKg4RVl/h1Q== X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="457835088" Received: from yyu32-desk.sc.intel.com ([143.183.136.146]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2021 13:47:47 -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 v26 5/9] x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking Date: Tue, 27 Apr 2021 13:47:16 -0700 Message-Id: <20210427204720.25007-6-yu-cheng.yu@intel.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20210427204720.25007-1-yu-cheng.yu@intel.com> References: <20210427204720.25007-1-yu-cheng.yu@intel.com> MIME-Version: 1.0 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 82FCDC0007E3 X-Stat-Signature: znkw8yb8exhha9d1wr48ocg1hma5noth Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf14; identity=mailfrom; envelope-from=""; helo=mga17.intel.com; client-ip=192.55.52.151 X-HE-DKIM-Result: none/none X-HE-Tag: 1619556455-480453 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 introduced 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: