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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no 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 D300CC3A59F for ; Mon, 19 Aug 2019 07:40:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A472D218A4 for ; Mon, 19 Aug 2019 07:40:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="FBPiWfth" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727075AbfHSHkS (ORCPT ); Mon, 19 Aug 2019 03:40:18 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:55078 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725790AbfHSHkS (ORCPT ); Mon, 19 Aug 2019 03:40:18 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7J7dJCN172685; Mon, 19 Aug 2019 07:40:10 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=corp-2019-08-05; bh=GVh2oO0nd6sSkP06ZTnvwu+Lum4//U9LoDANkL5xm+w=; b=FBPiWfthLi/45K++LRRsHnM6lEKJfvmMSTC4rDaMUSQK9ZRqaDpKKoRf1WIVDV1MyMww BCsTNBZhrg6X69Mf+7kuXTFwTSln+zl37ed9or9eaog0wY/s4jDdwkvHVL2fgr6k9Uct ZzoezD59EVGKzSxz2g4i20oyTcS3iy8BaR6G0rv3sLaFx9wOEoUVo0KiZMZjPBZ+e5OG sVWw9EGfToNR40pv/xlwI3oJoFiwVLnOXGNy/eWKmyWNSJBtLRSytlhPBCRZtXX/xsQM slgQ14eBNDBMM6tnkRjz5macSfMVHdy6vJ9y8ZBkfzvNTowFX5Obm8oDLllY5Qkuol12 pw== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2130.oracle.com with ESMTP id 2ue90t5s77-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Aug 2019 07:40:10 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7J7bqN5036609; Mon, 19 Aug 2019 07:40:10 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 2ue8wxsj9q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 19 Aug 2019 07:40:10 +0000 Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x7J7e8ZO005044; Mon, 19 Aug 2019 07:40:09 GMT Received: from kadam (/41.57.98.10) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 19 Aug 2019 00:40:08 -0700 Date: Mon, 19 Aug 2019 10:39:58 +0300 From: Dan Carpenter To: "Zhao, Yakui" Cc: devel@driverdev.osuosl.org, Li@osuosl.org, x86@kernel.org, linux-kernel@vger.kernel.org, Jason Chen CJ , Liu Shuo , Fei Subject: Re: [RFC PATCH 08/15] drivers/acrn: add VM memory management for ACRN char device Message-ID: <20190819073958.GC4451@kadam> References: <1565922356-4488-1-git-send-email-yakui.zhao@intel.com> <1565922356-4488-9-git-send-email-yakui.zhao@intel.com> <20190816124757.GW1974@kadam> <8b909c22-3873-2b5d-4845-1fee1a5d81ce@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8b909c22-3873-2b5d-4845-1fee1a5d81ce@intel.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9353 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=907 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908190088 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9353 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=974 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908190088 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 19, 2019 at 01:32:54PM +0800, Zhao, Yakui wrote: > In fact as this driver is mainly used for embedded IOT usage, it doesn't > handle the complex cleanup when such error is encountered. Instead the clean > up is handled in free_guest_vm. A use after free here seems like a potential security problem. Security matters for IoT... :( regards, dan carpenter