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Mon, 1 Jun 2026 13:42:50 -0700 From: Nicolin Chen To: , CC: , , , , Subject: [PATCH v1 0/7] iommufd: Fix bugs in eventq fops_read paths Date: Mon, 1 Jun 2026 13:42:31 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECD6:EE_|IA0PR12MB8086:EE_ X-MS-Office365-Filtering-Correlation-Id: f51316ad-c7ac-48b7-7ad0-08dec01e6724 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|82310400026|376014|13003099007|6133799003|18002099003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700016)(82310400026)(376014)(13003099007)(6133799003)(18002099003)(56012099006)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 19/QK9S5GxVVbyFvMizLRJVBbIjDFdraATOCUjnHeQ/eA6+A+FxdN+O93JpFk3X+qXsCQ3fsDBgTXBoGJzv4lw11R3nRTKmhLT9kW/5ACCWTMO1lC2JYMi3nTcQI9w9XtRVnw4A5SQjs1gvWqAjPx8c8ZMAHcsCWHafOwA/2ezH7QoxFBqiS8GWUjs/x96kCR5x+zW5J+NzvObRrqqI/3/gTPHMmWU8oYO4+pH9z18YNZ+gl6oLJxt9C30i/m09wpch7nKNp+1qH/DGF9gqg74OXub+lYnse3prSnuwrwK4bl6OVw/y9JiHALbh1Ox8ayuTzGzJgkxdptRyDcQ0wIcqL7gPN+A1eoiS7+f7EiFmhR4jzE10hP3/Iq6ew/NMzsHGPypbxZTYd/nBqtVj05RfBRAPMLPS5uOIp5JzJl0rX7/9Jd9Mv3Js0nrmUjADr X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jun 2026 20:43:14.3259 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f51316ad-c7ac-48b7-7ad0-08dec01e6724 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000ECD6.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8086 Bugs were found in iommufd_veventq/fault_fops_read(), where userspace may: - Receive a corrupted byte stream after a partial copy_to_user - Spin in a poll/read loop when reading with an undersized buffer - Miss notifications when the kernel cannot allocate a lost-events copy - Receive duplicate faults with stale cookies after a mid-group failure - Cause the kernel to retry the same failed copy_to_user indefinitely Fix them, then add selftest coverage for the vEVENTQ count validation. This is on github: https://github.com/nicolinc/iommufd/commits/fix_eventq_read_bugs-v1 Rebased on Jason's for-next tree with the veventq_depth series applied. Nicolin Chen (7): iommufd: Rewind header length in done if iommufd_veventq_fops_read() fails iommufd: Reject invalid read count in iommufd_veventq_fops_read() iommufd: Propagate allocation failure in iommufd_veventq_deliver_fetch() iommufd: Reject invalid read count in iommufd_fault_fops_read() iommufd: Break the loop on failure in iommufd_fault_fops_read() iommufd: Avoid partial fault group delivery in iommufd_fault_fops_read() iommufd/selftest: Cover invalid read counts on vEVENTQ FD drivers/iommu/iommufd/eventq.c | 29 ++++++++++++++++++++++--- tools/testing/selftests/iommu/iommufd.c | 17 +++++++++++++++ 2 files changed, 43 insertions(+), 3 deletions(-) base-commit: f25989c19028e8bf81e26e1133a99e3436c3afc2 -- 2.43.0