Description
In the Linux kernel, the following vulnerability has been resolved: drm/imagination: Size page table preallocation by device address Commit 0a8224058a58 ("drm/imagination: Fix page count for page table for map() interface") passed the device address to pvr_mmu_op_context_create(), but the preallocation is still sized from device_addr + sgt_offset with an exclusive end. The offset into the object's pages has no place in a device-virtual range, and the exclusive end allocates one table too many when the range ends on a table boundary. Count the tables from device_addr and the inclusive end of the range. The new calculation does not take page table indices into account. This fixes another issue with the previous implementation, where the difference between start and end indices could underflow when a mapping crossed a page table boundary. This would lead to the driver preallocating a huge number of MMU pages, exhausting system memory and triggering an out of memory panic. [Alessio: add paragraph to point out OOM bug being fixed, cc stable]
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
ff5f643de0bf27874c4033cd57a0bd034b5c7d11 to < 51b56bad96fd20127034f660b337c00317c65151affectedff5f643de0bf27874c4033cd57a0bd034b5c7d11 to < f9b215b3e37a5047c406545de51bf8a2aeb4cd1caffectedff5f643de0bf27874c4033cd57a0bd034b5c7d11 to < 7f73da0facf864fe796371ebaccacb1fee678aafaffectedff5f643de0bf27874c4033cd57a0bd034b5c7d11 to < 789f290b2e81d42820bddcb4010ffbc2ae2ded54affected
Linux Linux
Default version status: affected
6.8affected0 to < 6.8unaffected6.12.113 to ≤ 6.12.*unaffected6.18.57 to ≤ 6.18.*unaffected7.2.11 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected