Description
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix UAF in selftest IOPF reporting IOMMUFD selftest TRIGGER_IOPF borrows an attach handle from group->pasid_array without synchronizing against PASID detach, then a concurrent iommu_report_device_fault() can dereference that borrowed handle's domain pointer after the detach erases the handle and frees the backing struct iommufd_attach_handle. TRIGGER_IOPF then dereferences the freed handle, causing a UAF. Fix by adding a iopf_rwsem in mock_dev to follow the expected design of a real driver. Hold its read side across the whole iommu_report_device_fault() call, and its write side around every path that attaches, detaches, or replaces a device domain. This can block new reports and drains in-flight reports before an old attach handle or the IOPF fault parameter can be removed. Also take the write side while registering a mock device, since it can invoke the mock driver's default-domain attach callback.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
ddee19971081b42615d62f4fdada21274708ed4d to < fd2e7ac94d6d813548b021473c3dddc30c8c07d1affectedddee19971081b42615d62f4fdada21274708ed4d to < cab2895729516799384d48560e6fca105fb3f927affectedddee19971081b42615d62f4fdada21274708ed4d to < e27e90bde68b2ab92e63ed19caad1ef57188bea0affectedddee19971081b42615d62f4fdada21274708ed4d to < 8c07df7cdfcf52f1ff276c588612aabc6c6b8399affected
Linux Linux
Default version status: affected
6.11affected0 to < 6.11unaffected6.12.112 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected