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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D5E5D3E2A0 for ; Mon, 28 Oct 2024 19:14:42 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D60926B0092; Mon, 28 Oct 2024 15:14:41 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D0FE56B009A; Mon, 28 Oct 2024 15:14:41 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B62EA6B009E; Mon, 28 Oct 2024 15:14:41 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 997536B0092 for ; Mon, 28 Oct 2024 15:14:41 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 3B8A6160D58 for ; Mon, 28 Oct 2024 19:14:41 +0000 (UTC) X-FDA: 82723962258.16.42C8EC9 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf11.hostedemail.com (Postfix) with ESMTP id E13B740010 for ; Mon, 28 Oct 2024 19:14:08 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b="Jq/hYJuP"; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=uBetAWXt; dmarc=pass (policy=reject) header.from=oracle.com; spf=pass (imf11.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1730142703; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=ZfOe3egXLspWVtafedJoKrjpCM+0GVlwB53FktvK8kk=; b=7jn2YANIusFk+tO0HU1LbTVNfarATEc9CZxC7TTN1YC7GcIn/7/m5KQ3IWIOSWdbPBRzoT B2+tjLcimvZRwNFlx/zDrls2fm5QX18Wo0lrMQwPJkR+0PaMkcQkfL23PWBrGmDppTrrVA i5RDzivE/JEpNKOkaQngnPYPigpxYV0= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1730142703; a=rsa-sha256; cv=pass; b=cQadjwma53GRpAwYjXJpIRCqQLwbTQuamGYkyw6l6nMW0l1Q/16zZkaJne88qdmZnEYG66 WZefCpje5p8xJP9nhY7SJ0UJ4NNnJiv0lzgVyLc0WSvGK0dTSi8lPK4BbTrwPRkMww+VAA +5KOZydv8zrzUZO26DmDK2rmV+L3FaA= ARC-Authentication-Results: i=2; imf11.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2023-11-20 header.b="Jq/hYJuP"; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=uBetAWXt; dmarc=pass (policy=reject) header.from=oracle.com; spf=pass (imf11.hostedemail.com: domain of lorenzo.stoakes@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=lorenzo.stoakes@oracle.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") Received: from pps.filterd (m0333521.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49SEteIj031501; Mon, 28 Oct 2024 19:14:30 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=corp-2023-11-20; bh=ZfOe3egXLspWVtafed JoKrjpCM+0GVlwB53FktvK8kk=; b=Jq/hYJuP769KwdC1wBIpgZZriaymt+8wOm Kk/jlgvisoOEfAtwUivZSdcQprl+50QjpvKNPpq/aMNO4G7iMcbNVGNkPSNkvSBE u8V+uZhiz18kf9YR6dAkUFfAdPl75/MKcS4F8IE9UQscc/RdhGWPIMEtP8tuTrzf 6MIDWhhLZ1E3erHl6PuflwQrE55Tl0V6eoLSayBh0t7/n8nYuZ5sq9qHW7GN+22E WIVDaZk0ILzfbg558cPdg9qHK1GuZy0tmAUqWaB2kMFPGAo9AvCZZlKx/WEHLwhU iEPmCQ+3NI+XVmmsuu1WMNBYRVQUUqYgDpbZl8EeWSHJ/jMApYWg== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 42grdxkru4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 28 Oct 2024 19:14:29 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 49SIicxG040236; Mon, 28 Oct 2024 19:14:29 GMT Received: from nam12-dm6-obe.outbound.protection.outlook.com (mail-dm6nam12lp2171.outbound.protection.outlook.com [104.47.59.171]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 42hnamwd2k-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 28 Oct 2024 19:14:29 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=f4FgN9F/hv+18pZP/gsGHs4GEjZJUrzFcEwSlmY1Ymjd1BvfoenZxhvWFOfe8tFgvD9UWCm2uyxqQtOf7qZeovvmIqgCBAatZ4kQHFqEqhO5b9FZ8jNgfiTbx4QUYvCy1tjhzenEamqrADtoZ9kRRPQCPt7smyvO862knnZiZijGgspl0udUsIDHIChZSq7eQ4WNEaj/wlpwF8ciidDuLpPkMcibvAixqJpdFi6/QPWBNc9ka61d3K0HXZRqyfNt+MRML2rDJ19/onJ19tSjphPuWa4+qo2k0JywtuQ1R200ngmYVOtNli30AFavS6uXP6C/b6HTWes0vID0vgkoBg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=ZfOe3egXLspWVtafedJoKrjpCM+0GVlwB53FktvK8kk=; b=PUqnAfbu3CmUyAnubx5CvZt9RQeNSXW6UBN7lEbM9lpWIakGJwN5kZn3ZSegz2wej241RiH5rGaLq8LtOkPSCh2dGZ6qmFe+cayrJb9+PjowgzUrZmNXuPQCvhllaHBFPJIeEPhMGMuwyz9v/7jcEiRvOlF4JYO+BCuedqsdaOX4ZpL+kYI1ABkaU9RRxIBADStDtdED9cD2/cWxohmKFN7GZ01Ai/7pnsxOqJ1SliQXF/uGqweLY6vj7DCegRzSrdAVmpWGJuthJgghCyzH+zR8uAeiwuXs1pkm0qKYBGJJA0i6IRnrRgYPyHd7sCqnHiCceJPSpT2zYnb7pIPgNw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=ZfOe3egXLspWVtafedJoKrjpCM+0GVlwB53FktvK8kk=; b=uBetAWXtZzjZoPw6qXMN+lyqD9DSdNSH3CYtUOGdQomGnf8B2vKgbVbMpK+T+EN8+9z3mmf84CTcxlJYmuXn1McbNvhoa5nfmYC0aD9RnFACcE7IM3OmLgooXqgBDIMcptJGu41nvWw6REeMD5nbqKkWfmJzXLJVHibMS9jghrw= Received: from BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) by BLAPR10MB5075.namprd10.prod.outlook.com (2603:10b6:208:322::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8093.23; Mon, 28 Oct 2024 19:14:26 +0000 Received: from BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9]) by BYAPR10MB3366.namprd10.prod.outlook.com ([fe80::baf2:dff1:d471:1c9%6]) with mapi id 15.20.8093.024; Mon, 28 Oct 2024 19:14:25 +0000 Date: Mon, 28 Oct 2024 19:14:19 +0000 From: Lorenzo Stoakes To: Linus Torvalds Cc: Mark Brown , Andrew Morton , "Liam R . Howlett" , Vlastimil Babka , Jann Horn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Peter Xu , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Aishwarya TCV Subject: Re: [PATCH hotfix 6.12 v2 4/8] mm: resolve faulty mmap_region() error path behaviour Message-ID: <438f50c5-8b8c-444f-ae85-10e5151f3f24@lucifer.local> References: <6e8deda970b982e1e8ffd876e3cef342c292fbb5.1729715266.git.lorenzo.stoakes@oracle.com> <61461dcc-e455-450d-9c01-5465003fc31c@sirena.org.uk> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: LO2P265CA0391.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:f::19) To BYAPR10MB3366.namprd10.prod.outlook.com (2603:10b6:a03:14f::25) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR10MB3366:EE_|BLAPR10MB5075:EE_ X-MS-Office365-Filtering-Correlation-Id: 0930bce8-4799-46e0-3875-08dcf784bc9b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?M81WnUrXMqzCNa7za4bP1s9IBzwtrTOYk0hCG48XSQxiAIMHKl05aKuaHeQS?= =?us-ascii?Q?fj3fyMQv++TtmW1YAxwna0ARtXXrGrSje5RKgAv8BbqQILvjv8NNyOph/kx0?= =?us-ascii?Q?TK4Rc8dv+bLkJ7GBMFNQ/xzI0AA0/VVUkSJuLF1mkqVWdjzCjaNgVVUKVNTg?= =?us-ascii?Q?3VFlrZ/sh0TI3KbQECd9w6Oy63YSihYc5IwNw5O00ouYsAB3OZ6BskG4JWU5?= =?us-ascii?Q?R5dxqKAXL4waFyIyeNYMLMdoLNQbE0MbsIQP74EbFSc/W7Ylfewzqv6flCtV?= =?us-ascii?Q?UO43vkRBKSfEn6N799ormYOU6OyPj60aoFRaHAUy4keCW7WocNlB0HmGGE7C?= =?us-ascii?Q?kj20P12+j35+4N7Uc+uIeTysFs+xrWnEy7TKbEcF1Gqp81Yv8XRv0B5f9qfb?= =?us-ascii?Q?p3u2HTVUBQFAM2xWgShlmNvwlJEiTSuEFqWF938WdVSVhbe+A9s4mBcMleG+?= =?us-ascii?Q?9t1pAmVIu8jwd/rQqjzlzYNURDKhp8lqWbiR2cjvQ9W+pCOAyU36bHJ+m0sY?= =?us-ascii?Q?FMEqtNbNI6I2+dvxBvMIhOFNfTt8IJjygQIheoixkRn94mhq4+FALEUXWlbw?= =?us-ascii?Q?rv0DZTlm9WBWHNYwjs/pJLwHS+xvhqSJkc6YiAPymSrb/go7KiFdhYmf/NA+?= =?us-ascii?Q?m1OZ2k1yNAOD5f2dFcj6q79AfY/qeuV4WQUdubYUdpq5l0RtyICU2FCJEEMn?= =?us-ascii?Q?7cirrCJsM73WkPO5tQ5yei+Sx4INVx4CFieg98i5nyU0iemcciPFtBlV5D4U?= =?us-ascii?Q?wBkSV9qx84JIc+sT5wDtDzqW6nU7fUqtOf2smsR/BvDaLJmhqhaTub4k754m?= =?us-ascii?Q?AXnKBKdASiTXv/3X3Kim9EN1vqoKT2+9OW/rZLWitRqGmzJISPEkrh+iKhdN?= =?us-ascii?Q?6M4nKkP6vnAU5H+uGe5nZYn7T6v+y1d1ZiCulVXznv2RV/3Od+iWgnDMRiW5?= =?us-ascii?Q?eN7OJ/wEEgB3ooqMsef0tmeFTaC/urPdIlVzHuwGBSLbrgOukkMmkdzlEmY7?= =?us-ascii?Q?pt+FwzY8w9qeZCPDRK9bpc/pjvkkF1Tnjdbuwq1rsh8ibQMGAB12chKlaSNG?= =?us-ascii?Q?d70W0j0OQZkyU8l1zlxFTwysJC6wa/9/bgUdWypGCWfgZiQqkOYCCY02dNZV?= =?us-ascii?Q?h8XxhRlj3AQgrXweHAe/0+Mcmc1wB0Rqc4g+3Elm13Pef33p2v2M3Jqk4Pa6?= =?us-ascii?Q?Jlk2xRgEQJE4LDV5k2fZ7K+SKdH+pFJJMpdaZgFh5qo9SWBIeA0gqKCYJDL3?= =?us-ascii?Q?IJM7Ru2gjSD0tBTdJZDCPw4sOYcoZ9dPEq6M+PNO5k/FCgCI+M9KXjcpzTHo?= =?us-ascii?Q?bU1DjuIIOJ0KxRXVtlelR42d?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR10MB3366.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(376014)(366016)(7416014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?gI+kcFDPLHcqHKbkz6tTBgUlk9NiiRmfLIog5966Jdm/Q51JjXQCbP/xQ3+s?= =?us-ascii?Q?uknEvxHbmOhUVdsjbzs6KGwB4sH9owa5Vzd/Tprxy4rAL2NKr87y+c6ztZ61?= =?us-ascii?Q?/Hj2ONysgWSEvScb5Ccw6tWFFrqa2zPPeAr/SPjkzDciCOM24IzHDXZKmLw8?= =?us-ascii?Q?Tq/XdBPTZPjCXRtNMfCD9RqPbWJB8eHZi7QDnCG7cK9JdzE+re8cWuEK5p5u?= =?us-ascii?Q?bhszLacwSEr5+9H6Hh9D2V0IOKLbzKMHkjUMuuddgqXEUTmnvHUr/9zTy5aq?= =?us-ascii?Q?PzJ0YNoCPpQ46h77NRO69NGIDmwLnCNaRx7f3+ryKB6hikIqofUIOfNI+lpg?= =?us-ascii?Q?2fov8vrADX+Uu6Akzzo1pW4DYdNSnVmzTK3ttERaIYQ3BwfYs0dDkM3aGmO2?= =?us-ascii?Q?hS9sB8fCZ3VrZZLuRfYfhY+yhCyVerMggUzYnIgr0YyQKWo0jdQmx84hqHg8?= =?us-ascii?Q?odVIYe4GL+I8tnwnH9dd5RwTna2FDKkTfQPUTgScwwXch0fCe2N9FM0eaj5y?= =?us-ascii?Q?zEBL70pmsg2fGnpLRRYvnxPkgVWuVFuXR8W2UT/n5I3QizeREXbjXTQJWZdx?= =?us-ascii?Q?i9xweAsNaOF9YgbSukKEr+uCQKnVAJmbSxiBkk9LkQywPcw09WxGpFe4QVfD?= =?us-ascii?Q?oXCe3nB1qZwppdmkXDuRVxFkKdIlA9+QcbD8GTrUEL/D/G26m7ZZkKDdFu9M?= =?us-ascii?Q?emKIzHO5+Yo6DxntyGjQ2IdfJdLNv55XfRoShubiLG33+Gn0LrHbVFq7gjM+?= =?us-ascii?Q?ovz+TY8glDpxTer4JqiCb5wrrz+la3TjjL91M18u+xtl5YeMyxqvQrAGPPqf?= =?us-ascii?Q?+QBkfFaMVrJsBk1JpFH6ANpQDtWc/4iPbevL6ZEGtpLUgVPB4wTryTJuNBfS?= =?us-ascii?Q?9sMlaWkZhxGDkyoYaOYN8FEovHHCFmgYiR5Y5UAjaecBjJ4JcthvcppMPoPF?= =?us-ascii?Q?8RwyEhPLTSdceE+koCNlHlkwiuDXsRacThtHvSGPU+9TdW5e7YVgJB/GbbkR?= =?us-ascii?Q?U2B+hRXBbmj0XT6meGfAVmpcKjCuTcijBgONjy4wpiqBzY4vftIpuAloYAsZ?= =?us-ascii?Q?R6c0krCEg1i+cV7f4XpUcqyUOMI+prrmstO4O1Avb/6H4NDJ2hNipyJq6K8j?= =?us-ascii?Q?LDfU7cTIPp6UZ7yfAR/DbeD9JaNW2ms+RlmaNG2QqOMrBRPaFAUnulxTNo9w?= =?us-ascii?Q?uiRyJVX5FKI37tqvLXVMHQckMlMV6BNcucR/IQBeG5fhQLh9Dmev3o8HYPg8?= =?us-ascii?Q?naiuqzoc6vpmi54VTm5TeTr0adMoLvgdDnVJ9duhMZDCZ1PhYHqRq67uRSRL?= =?us-ascii?Q?MewC/ILmjOgXlIxCkPun1fkS2swhbtZcv6yqHHvDBzhjknfEKgtOgeuxPmoh?= =?us-ascii?Q?5n8kym0Ws/KGx1goYHw77wfUQukqVIcQWf6YexJCUHWPuJk4DXTGF6ac5Krm?= =?us-ascii?Q?H1luYrkIOIvEhJjlivsCmDv6ye/Ww2r7YrPeX351djsZBwGZgyOOwFMIENY2?= =?us-ascii?Q?JEo4J/D9mi/ZiwOcnQQI8X7EwKkBajHCVzGmvWUCmg2Ku1fnW44MZaEtC/wj?= =?us-ascii?Q?4mVVxgp/QH7bkIdMKnlWcTeSeSO4W0wdzBICi03lquGwn5tw0B1oM/FZ/Wfl?= =?us-ascii?Q?LQ=3D=3D?= X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0930bce8-4799-46e0-3875-08dcf784bc9b X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB3366.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Oct 2024 19:14:25.2822 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 9Hw6MjOUoIu4etAS7g5ZIeJyVwqsq6aUl3SFTT0zdffSGt6o2hT9/uxp0YuxXVp9Er5d4ck+Z6GoLefV/TZV/Q0JOw3mLTAyOg/yg932v6E= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BLAPR10MB5075 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-28_08,2024-10-28_02,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 phishscore=0 bulkscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2410280150 X-Proofpoint-GUID: AFY2u26JKI4SHqwxOsDnh6MNCjyW0VSc X-Proofpoint-ORIG-GUID: AFY2u26JKI4SHqwxOsDnh6MNCjyW0VSc X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: E13B740010 X-Stat-Signature: dntdep1xm6fdiu9d4d5ayebg9xudn99h X-Rspam-User: X-HE-Tag: 1730142848-637845 X-HE-Meta: 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 clIafaIy 5wQeSOs/zLYpBCWHVFzbze0PZkuW1kig3DzTIWIynwVMc16yDjCpYLX7Rlm9Aghbbgg3zzkmpRakniDDWQh5cX3HTwT5MWNX5aDGkffL2j6bLgzccwjM8RUMGErASN/PGd3sreYDQXyJTE3fdKNx6+pdjdVG58lwVrLdIu8/a28PsNEGkPSFMbkiZv+Vfhg5CKqQabZ3DqlwzJPae9qg+KUCcWeWTgTy4m3m4Q8db528JWNf0Z8ilf7D6pQtrciKyBwZtbEvLgsVY7LJHLibR1bbtNWxv+gdH0UHB3PAq6Zpg9NxcHlfyXD0zMN8Si8VrCG6TGt+uE9UMuanzt0WhktqoE3kDDgEnsmiM44oYpmHDhKJTqnyqdPk/dsybS18QACA16NZb+jbhkOnbek52N9RgAhIvcS6EkFkOoS8Q5afkQ1FriOLglh9BgelfhfeJmx1Hi6wrt+hhS1Fk3043vs6BbQWld47KeN/R5nbTIF+KpQIXYFCBciUhifhs0XqQOeYrAki2bRhGDt7wO3O+7mqCXUnZwq/64k3lZXdAvzxg8cj03ewKNIXqqncRBO/TlErp 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: List-Subscribe: List-Unsubscribe: On Mon, Oct 28, 2024 at 09:05:44AM -1000, Linus Torvalds wrote: > On Mon, 28 Oct 2024 at 08:57, Lorenzo Stoakes > wrote: > > > > So likely hook on your mapping changes flags to set VM_MTE | VM_MTE_ALLOWED and > > expects this to be checked after (ugh). > > Gaah. Yes. mm/shmem.c: shmem_mmap() does > > /* arm64 - allow memory tagging on RAM-based files */ > vm_flags_set(vma, VM_MTE_ALLOWED); > > and while I found the equivalent hack for the VM_SPARC_ADI case, I > hadn't noticed that MTE thing. > > How very annoying. > > So the arch_validate_flags() case does need to be done after the ->mmap() call. > > How about just finalizing everything, and then doing a regular > munmap() afterwards and returning an error (all still holding the mmap > semaphore, of course). > > That still avoids the whole "partially completed mmap" case. > > Linus Yeah I was thinking the same... just bite the bullet, go through the whole damn process and revert if arch_validate_flags() chokes. It also removes the ugly #ifdef CONFIG_SPARC64 hack... This will litearlly only be applicable for these two cases and (hopefully) most of the time you'd not fail it. I mean by then it'll be added into the rmap and such but nothing will be populated yet and we shouldn't be able to fault as vma_start_write() should have incremented the vma lock seqnum. Any issues from the RCU visibility stuff Liam? Any security problems Jann...? It'd suck to have to bring back a partial complete case. Though I do note we handle errors from mmap_file() ok so we could still potentially handle that there, but would sort of semi-undo some of the point of the series.