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Wed, 3 Jun 2026 14:27:17 -0700 From: Nicolin Chen To: Will Deacon , Jason Gunthorpe , "Kevin Tian" CC: Robin Murphy , Joerg Roedel , "Shuah Khan" , Pranjal Shrivastava , Kees Cook , Yi Liu , Eric Auger , , , , Subject: [PATCH v1 0/4] iommufd: Cache invalidation hardening and SMMUv3 batching rework Date: Wed, 3 Jun 2026 14:26:52 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 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: CY4PEPF0000EDD6:EE_|SN7PR12MB8103:EE_ X-MS-Office365-Filtering-Correlation-Id: d8c57470-b901-4161-fb87-08dec1b6ec8e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|1800799024|7416014|376014|82310400026|13003099007|3023799007|18002099003|6133799003|11063799006|56012099006; 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)(36860700016)(1800799024)(7416014)(376014)(82310400026)(13003099007)(3023799007)(18002099003)(6133799003)(11063799006)(56012099006);DIR:OUT;SFP:1101; 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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 Sashiko pointed out several issues in the iommufd invalidation path, which also prompted a rework of the ARM SMMUv3 vIOMMU invalidation handler: - entry_len is user-controlled and unbounded, so the trailing-zero check for its forward-compat fields can scan gigabytes of user memory without yielding, long enough to trip the soft-lockup watchdog. - A large entry_num drives a backend's per-entry invalidation loop with no reschedule, e.g. the VT-d nested path, pinning the CPU. - The full-array copy helper copies the array twice on the equal-size fast path: once in bulk, then again entry by entry. - arm_vsmmu_cache_invalidate() reports converted-but-unsubmitted commands as handled on its error paths. - It sizes a single kernel allocation from the user-controlled entry_num. - It rejects an empty-array data_type probe that the uAPI allows. Fix them properly. This is on Github: https://github.com/nicolinc/iommufd/commits/smmuv3_fix_iommufd-v1 Nicolin Chen (4): iommufd: Set upper bounds on cache invalidation entry_num and entry_len iommufd/selftest: Add invalidation entry_num and entry_len boundary tests iommu: Avoid copying the user array twice in the full-array copy helper iommu/arm-smmu-v3: Process vIOMMU invalidations in batches include/linux/iommu.h | 1 + .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 91 +++++++++++-------- drivers/iommu/iommufd/hw_pagetable.c | 11 ++- tools/testing/selftests/iommu/iommufd.c | 15 +++ 4 files changed, 81 insertions(+), 37 deletions(-) -- 2.43.0