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Received: from CH3PR12MB7763.namprd12.prod.outlook.com (2603:10b6:610:145::10) by DS7PR12MB6024.namprd12.prod.outlook.com (2603:10b6:8:84::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7875.19; Thu, 15 Aug 2024 23:37:45 +0000 Received: from CH3PR12MB7763.namprd12.prod.outlook.com ([fe80::8b63:dd80:c182:4ce8]) by CH3PR12MB7763.namprd12.prod.outlook.com ([fe80::8b63:dd80:c182:4ce8%3]) with mapi id 15.20.7875.016; Thu, 15 Aug 2024 23:37:45 +0000 Date: Thu, 15 Aug 2024 20:37:43 -0300 From: Jason Gunthorpe To: Nicolin Chen Cc: kevin.tian@intel.com, will@kernel.org, joro@8bytes.org, suravee.suthikulpanit@amd.com, robin.murphy@arm.com, dwmw2@infradead.org, baolu.lu@linux.intel.com, shuah@kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v1 01/16] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and IOMMU_VIOMMU_ALLOC ioctl Message-ID: <20240815233743.GW2032816@nvidia.com> References: <536c5e908af3847649d1f4b7050af17d77d8b524.1723061378.git.nicolinc@nvidia.com> <20240815181117.GN2032816@nvidia.com> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?H/jMhD8LtWtyENV9QEHUm/F/syc1v+BhxbNKD8mCjZhmlTiFPZTN/DGzRX60?= =?us-ascii?Q?Oq0jFevfdGVVZ5sqaQrrK+LxFNIJ5cPAX0Bigk8uw6fdCPyfAEvDdReV9jFO?= =?us-ascii?Q?MtAkLmxDyGeomkA6PDxlQT9jPvrydcbpTC1Z/YQttIvN4jLSK2tilgY/9jnU?= =?us-ascii?Q?VAwVdQBClZQDEGG7l+gXhHO5ZjHTobc+ioEoeMJS+6p8/WU83jgEnTjsp+Np?= =?us-ascii?Q?pjgwFyOauIxqzDAYOjpy9DUJFN4sCLi5iyzOLGDChAW0+3igS2Qsjc++Xmrn?= =?us-ascii?Q?tNFHdXPhZKeC/pUpyIWFdiz6xoUNsVua+fl428qvJ+pghNjG4fBAQgzcpPEm?= =?us-ascii?Q?QGGEf/3b4/1JHYLIPgSP3/QlZGMVlzdbLrJiF8JCS7sglOSfBIa1oDBgQQkE?= =?us-ascii?Q?Dk+HIWSphX04PMpNuYe4fWr9Am8B/ppBmyBx4cYB8tJ0uV+78cyOVWmnLX7o?= =?us-ascii?Q?xKsSro4qLDFSzDozIQggcV0UG2ScmWy8MEItK7Ayifg3ij8OXJoOL8nxuHvg?= =?us-ascii?Q?eY2bmZMD+EQj16wKwtwU0aqjra74Kuv1+trRN8EDtQMwJ55x5AzvhiDRPtPd?= =?us-ascii?Q?93RE9ivsNKbz6RVd9r/HQCybpboQLngxqCO7jHk0mpRS0qlMhoeohCBXMjcj?= =?us-ascii?Q?exE4XN6a3kdNULuw15tGyYguT9d1Y9yrg3D6h0cPdsxVeLaMtcFiBzJXIBxS?= =?us-ascii?Q?tOloPeBpNII2e3X4m5C9pogH3iw36XYlrLWhfOU7T8uhB50MWTemNf5Htd4L?= =?us-ascii?Q?0Ug+ce7nZwrrvSTBYjOJziXCO507CtisY8F6KnMsPsailACt4B5OxP/2n+0p?= =?us-ascii?Q?dne8x7W6XDIL+8gv/tAaa752JZjRoejNw9nKAL/+SZPKLs7bz8MzxDYQsI2r?= =?us-ascii?Q?QHLnoz+xREyRaKIoR3bBPk+3hjQ0/Uaa9GP60AzSN+c7DSyxeSwg0QG1CZnV?= =?us-ascii?Q?C6vNdQX9K4KK59Q9BameAJxra0rw7w8fhjANIZ+VU87BgmSRCnveQbOI+IcG?= =?us-ascii?Q?MlqgB2D7bdMbIoJglu756SMyPAI0dbQNR4G7GMSfaes4JqXd3GSQ57d+igiu?= =?us-ascii?Q?nOo35kBkaVN5Uv++5D5KKq2uUrvUljcQqJkwmyLI2cglfMzmuQkpWlzlI2nX?= =?us-ascii?Q?4oKIcH2q/NHg5r0Vld/McGx3QhuOoBgAxjXRqFRwYi29QhT6/loKzOY5Wio+?= =?us-ascii?Q?vXk8e3DyL2ndFEfh4Aty7W5lcp4Pnl4/f8+Vg0hP6bptuWUf8gFKx8lLJYEK?= =?us-ascii?Q?sPvBNGB20IR6fxGYtrEMy2nnXntli21MeFUzUMucsg4p6SxTtCsikeQ/0SJB?= =?us-ascii?Q?Wxuupds1oPBIN9mbG6MK/K9WkHJW5/GSnML3vfgVknsZBlrvN++pCywj7Uct?= =?us-ascii?Q?qejDrNLinXjIfN2lYAV6nBKOaUFJuZmZJzO6hpbTMbT3UlGM6HGsxGzoMEQn?= =?us-ascii?Q?jP+LjsrLWWd09N+GIzI+hfvoqxHxecGQcsaJsinJnQU5PbaZtgFVOgFptm7F?= =?us-ascii?Q?c+JruYbFUjJvymM6dy2wGfijPldZouHP93HuvR3bJaECMAw5lKvxDyBdeUwm?= =?us-ascii?Q?O/+rnhpljaqqfE0TGu8=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 85a62417-20c0-468d-bdb6-08dcbd83436a X-MS-Exchange-CrossTenant-AuthSource: CH3PR12MB7763.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2024 23:37:45.0547 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: FMGLfDCUCKcvEHxJAiXYjtyjpMuLo4bmdZZDssACrhMMayaPkBk76wEZGxh2G4+o X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6024 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240815_163752_688572_6CD29EDF X-CRM114-Status: GOOD ( 10.40 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 15, 2024 at 11:20:35AM -0700, Nicolin Chen wrote: > > I don't have an easy solution in mind though later as surely we will > > need this when we start to create more iommu bound objects. I'm pretty > > sure syzkaller would eventually find such a UAF using the iommufd > > selftest framework. > > Would adding a user count in struct iommu_device help? Yeah, maybe something like that. It is a real corner case though. Jason