From patchwork Tue Apr 27 20:47:19 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: 12227319 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 034C2C4360C for ; Tue, 27 Apr 2021 20:48:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9E85D613F3 for ; Tue, 27 Apr 2021 20:48:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9E85D613F3 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 84DF46B00B0; Tue, 27 Apr 2021 16:47:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 729C36B00B9; 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 494306B00B0; Tue, 27 Apr 2021 16:47:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0147.hostedemail.com [216.40.44.147]) by kanga.kvack.org (Postfix) with ESMTP id 07E2B6B00B0 for ; Tue, 27 Apr 2021 16:47:52 -0400 (EDT) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id AC248582B for ; Tue, 27 Apr 2021 20:47:51 +0000 (UTC) X-FDA: 78079333542.19.D29C267 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by imf20.hostedemail.com (Postfix) with ESMTP id 5C3DA132 for ; Tue, 27 Apr 2021 20:47:42 +0000 (UTC) IronPort-SDR: UXfOOMOUp9lSsylYNAaFRBwDJneV6zsiU+n02MLd+aSIU0znXz0bQjlHCwI7rsoH67ShPWuxdU j+GIX+UewvmA== X-IronPort-AV: E=McAfee;i="6200,9189,9967"; a="176706723" X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="176706723" 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 13:47:48 -0700 IronPort-SDR: 8rwmVxob87MFnYMGci4MqzN6p43z90fNrub2zRTOn+yu0gU6omgeVk3BQBIp++OvQVjKbxddHk 6T6o4mX250ng== X-IronPort-AV: E=Sophos;i="5.82,255,1613462400"; d="scan'208";a="457835105" 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 13:47:48 -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 8/9] x86/vdso/32: Add ENDBR to __kernel_vsyscall entry point Date: Tue, 27 Apr 2021 13:47:19 -0700 Message-Id: <20210427204720.25007-9-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-Stat-Signature: n44pxprpkcwjyncmgypghzrip43udbk6 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5C3DA132 Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf20; identity=mailfrom; envelope-from=""; helo=mga17.intel.com; client-ip=192.55.52.151 X-HE-DKIM-Result: none/none X-HE-Tag: 1619556462-637754 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" ENDBR is a special new instruction for the Indirect Branch Tracking (IBT) component of CET. IBT prevents attacks by ensuring that (most) indirect branches and function calls may only land at ENDBR instructions. Branches that don't follow the rules will result in control flow (#CF) exceptions. ENDBR is a noop when IBT is unsupported or disabled. Most ENDBR instructions are inserted automatically by the compiler, but branch targets written in assembly must have ENDBR added manually. Add that to __kernel_vsyscall entry point. Signed-off-by: H.J. Lu Signed-off-by: Yu-cheng Yu Cc: Andy Lutomirski Cc: Kees Cook Reviewed-by: Kees Cook --- arch/x86/entry/vdso/vdso32/system_call.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/entry/vdso/vdso32/system_call.S b/arch/x86/entry/vdso/vdso32/system_call.S index de1fff7188aa..7793dc221726 100644 --- a/arch/x86/entry/vdso/vdso32/system_call.S +++ b/arch/x86/entry/vdso/vdso32/system_call.S @@ -7,6 +7,7 @@ #include #include #include +#include .text .globl __kernel_vsyscall @@ -14,6 +15,7 @@ ALIGN __kernel_vsyscall: CFI_STARTPROC + ENDBR32 /* * Reshuffle regs so that all of any of the entry instructions * will preserve enough state.