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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B916ECAAD4 for ; Mon, 29 Aug 2022 10:45:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229746AbiH2KpJ (ORCPT ); Mon, 29 Aug 2022 06:45:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229696AbiH2KpE (ORCPT ); Mon, 29 Aug 2022 06:45:04 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB2FDB7E4 for ; Mon, 29 Aug 2022 03:44:59 -0700 (PDT) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27T9eZUC007820; Mon, 29 Aug 2022 10:44:34 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=message-id : date : mime-version : subject : to : cc : references : from : in-reply-to : content-type : content-transfer-encoding; s=qcppdkim1; bh=QqnU85WQAU5nBie0nkaeNbLSIcZajjHqTcDzluokVFE=; b=U3fTUE5Ub/CaYHZzI6CnY7lBzy+Yq+H9Ivg4aGC9bTlO01T4wwuA6xWjNu3bP5tm7XNd YmQiGGjsoM1z0IXMMp8Qsq3Y7i+GBkkG9SVChptkHlSdEISJWIDiFpOIKW+OP3CflxKj tInH2qmCY0M8/gZnER11/6sCI7MmDJGYms/WtCW9nJ9PVIcg3107pUxx3M6f0Z2oq7f7 Gl0iHwF8jVOTo1T1x0ObQuKMSjMLRHjPiw4BlXrwfuPL9TlmRLhbPBRl/1J9vmg2XkbY rPzPvawJloq/FUa+Gz03PVI+hF8595If2sJblWErWIkVPeg5zKW4Zq1mhBt5bDrlkego 4A== Received: from nalasppmta02.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3j7bg8vbu9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Aug 2022 10:44:34 +0000 Received: from pps.filterd (NALASPPMTA02.qualcomm.com [127.0.0.1]) by NALASPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 27TAUY6p001898; Mon, 29 Aug 2022 10:44:33 GMT Received: from pps.reinject (localhost [127.0.0.1]) by NALASPPMTA02.qualcomm.com (PPS) with ESMTPS id 3j7cbm6xtd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Aug 2022 10:44:33 +0000 Received: from NALASPPMTA02.qualcomm.com (NALASPPMTA02.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 27TAiXhQ018147; Mon, 29 Aug 2022 10:44:33 GMT Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA02.qualcomm.com (PPS) with ESMTPS id 27TAiX0a018145 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Aug 2022 10:44:33 +0000 Received: from [10.214.20.211] (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Mon, 29 Aug 2022 03:44:28 -0700 Message-ID: Date: Mon, 29 Aug 2022 16:14:25 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH V5] mm: fix use-after free of page_ext after race with memory-offline Content-Language: en-US To: Andrew Morton CC: , , , , , , , , , , , , References: <1661496993-11473-1-git-send-email-quic_charante@quicinc.com> <20220826201941.de6ed957a0d6547b2d501c19@linux-foundation.org> From: Charan Teja Kalla In-Reply-To: <20220826201941.de6ed957a0d6547b2d501c19@linux-foundation.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: tOf7tybzL_PVTnXzjYC-APkcIl4poadD X-Proofpoint-ORIG-GUID: tOf7tybzL_PVTnXzjYC-APkcIl4poadD X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-29_05,2022-08-25_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 mlxlogscore=440 phishscore=0 impostorscore=0 adultscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208290053 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andrew, On 8/27/2022 8:49 AM, Andrew Morton wrote: > On Fri, 26 Aug 2022 12:26:33 +0530 Charan Teja Kalla wrote: > >> The below is one path where race between page_ext and offline of the >> respective memory blocks will cause use-after-free on the access of >> page_ext structure. > > What are people's thoughts on a -stable backport? It looks like the > bug has been there for years and the means of hitting it are obscure > and the patch isn't minor, so I'm thinking no? Michal also said no to back port and I also agree with. https://lore.kernel.org/all/YvNc8vuinnddc78j@dhcp22.suse.cz/#t https://lore.kernel.org/all/3aab7518-ff57-abdb-8bab-ea581197a07e@quicinc.com/ Thanks, Charan >