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Sun, 17 May 2026 19:28:56 -0700 From: Nicolin Chen To: , CC: , , Subject: [PATCH rc v1 0/4] iommufd: Fix veventq_depth boundary Date: Sun, 17 May 2026 19:28:45 -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: BN1PEPF00004689:EE_|MN2PR12MB4405:EE_ X-MS-Office365-Filtering-Correlation-Id: fe41189a-429d-4b35-faaa-08deb4853b9c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|376014|1800799024|13003099007|11063799003|18002099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700016)(376014)(1800799024)(13003099007)(11063799003)(18002099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: mDnFFUSjrOfCir4grPeaKEync3U9TKBsgfKavMssTt/LPxCEOHcEFNlcget3Sxk3DBna2L9Qcr9UFVYIidYWBmctndD2MesFSBp/qGz2QikFDM6r9R4tRGHNWfT8hVTrAXgI3UaDtNqBakIVSD10iy0/j2/t3gdBwc9zOwQog+Np2D6JIzWqX6fb6Nzo1t6Hm1lpR9zWQs/vCQ3/FUKHZeI9Mrbx3xtY5owtMWJrxXkFufjdfgioqssrjUGQouGJM0TzDK42QKoO3YX9QCKaATOp2V6CGQlzC6Rsf53+O2FP4rCdXleJfPKcfpQY954qZ44ZaGd3CVsvctBuXgCApJd1JbeVtQ3ND7OTIwVDw9DIxYEPM8tNk9jTnlybg0Nt+8QA/12t+wkgUjMHeegSzkjI/FhEVZJYAwvdfX/21LfdNmIQb2WMbbOL+D4UJbqZ X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 May 2026 02:29:05.4962 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fe41189a-429d-4b35-faaa-08deb4853b9c X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00004689.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4405 The upper bound of veventq_depth has been missing for veventq allocation, leaving a vulnerability where userspace could exhaust atomic memory pool. Fix it properly: - Allocate outside the spinlock to avoid GFP_ATOMIC - Cap the veventq_depth upper bound - Fix event_data byte-count - Add selftest coverage Note that QEMU's SMMU has been already allocating veventq using a "HW" EVTQ entry number. So, picking 19 as the known use case, for a minimal level of ABI consistency. This is on github: https://github.com/nicolinc/iommufd/commits/fix_veventq_depth-v1 Nicolin Chen (4): iommufd: Move vevent memory allocation outside spinlock iommufd: Set veventq_depth upper bound iommufd: Fix data_len byte-count vs element-count mismatch iommufd/selftest: Add boundary tests for veventq_depth drivers/iommu/iommufd/iommufd_private.h | 2 +- tools/testing/selftests/iommu/iommufd_utils.h | 17 +++++++++-------- drivers/iommu/iommufd/driver.c | 19 ++++++++++++++++--- drivers/iommu/iommufd/eventq.c | 5 ++++- tools/testing/selftests/iommu/iommufd.c | 19 +++++++++++++++++-- .../selftests/iommu/iommufd_fail_nth.c | 2 +- 6 files changed, 48 insertions(+), 16 deletions(-) -- 2.43.0