diff options
| author | Nicolin Chen <nicolinc@nvidia.com> | 2026-05-21 17:36:34 -0700 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2026-06-01 14:54:19 -0300 |
| commit | 6ebf2eb46fbd5b40393ff8fbb847ba96925beaff (patch) | |
| tree | cbe632fd06694a78ea20797ed502f72469dad31f /include/uapi/linux | |
| parent | 47443565d10c51366c9382dbc8597cd6c460b8a2 (diff) | |
iommufd: Set veventq_depth upper bound
iommufd_veventq_alloc() accepts any !0 veventq_depth from userspace, with
an upper bound at U32_MAX.
This leaves a vulnerability where userspace can allocate excessively large
queues to exhaust kernel memory reserves.
Cap the veventq_depth (maximum number of entries) to 1 << 19, matching the
maximum number of entries in the SMMUv3 EVTQ (the largest use case today).
Fixes: e36ba5ab808e ("iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC")
Link: https://patch.msgid.link/r/8426cbaa5e8294472ec7f076ef427cc473be5985.1779408671.git.nicolinc@nvidia.com
Cc: stable@vger.kernel.org
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'include/uapi/linux')
0 files changed, 0 insertions, 0 deletions