Description
In the Linux kernel, the following vulnerability has been resolved: drm/vc4: Supply the overflow slot size in BPOS, not the whole bin BO size vc4_overflow_mem_work() points BPOA at a 512KB slot inside the 16MB binner BO, but writes the size of the whole BO to BPOS. On every binner out-of-memory event the PTB is therefore authorized to write tile lists across all the other slots (which may hold the tile state, tile alloc and overflow memory of in-flight jobs) and, for any slot but the first, past the end of the binner BO into unrelated CMA memory. Since CMA pages are recycled into page cache and user allocations, this is arbitrary memory corruption by GPU DMA. In practice it shows up as GPU hangs with corrupted control list pointers, userspace heap corruption, a GPU that stays permanently wedged after the first hang, and occasional full system crashes, whenever a job overflows the initial binner slot. The bug dates back to the conversion from a dedicated overflow BO (where writing the full BO size was correct) to the slotted binner BO.
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
553c942f8b2cbc7394b4d4fa2f848b23a8f07451 to < bb5656ae063f2711f56438cf2f1f5b613aea5f12affected553c942f8b2cbc7394b4d4fa2f848b23a8f07451 to < 2f2291a119e9a8b696ae8bb36e86b75d272ceaeaaffected553c942f8b2cbc7394b4d4fa2f848b23a8f07451 to < 0badb30871004d34df87be33e853536f0b69885faffected553c942f8b2cbc7394b4d4fa2f848b23a8f07451 to < 6cd5acf6f87c073622bd61e38fe99c47365cda9caffected553c942f8b2cbc7394b4d4fa2f848b23a8f07451 to < 1e33ca7f44be64beed2735bb76b86eb65ba8c05baffected553c942f8b2cbc7394b4d4fa2f848b23a8f07451 to < 6395789e4739aa5177bbec0fa0f07ccc38d249b0affected
Linux Linux
Default version status: affected
4.13affected0 to < 4.13unaffected6.1.183 to ≤ 6.1.*unaffected6.6.151 to ≤ 6.6.*unaffected6.12.103 to ≤ 6.12.*unaffected6.18.44 to ≤ 6.18.*unaffected7.1.8 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/bb5656ae063f2711f56438cf2f1f5b613aea5f12 ↗
- https://git.kernel.org/stable/c/2f2291a119e9a8b696ae8bb36e86b75d272ceaea ↗
- https://git.kernel.org/stable/c/0badb30871004d34df87be33e853536f0b69885f ↗
- https://git.kernel.org/stable/c/6cd5acf6f87c073622bd61e38fe99c47365cda9c ↗
- https://git.kernel.org/stable/c/1e33ca7f44be64beed2735bb76b86eb65ba8c05b ↗
- https://git.kernel.org/stable/c/6395789e4739aa5177bbec0fa0f07ccc38d249b0 ↗