Description
In the Linux kernel, the following vulnerability has been resolved: drm/v3d: Skip CSD when it has zeroed workgroups A compute shader dispatch encodes its workgroup counts in the CFG0..CFG2 registers. Kicking off a dispatch with a zero count in any of the three dimensions is invalid. First, the hardware will process 0 as 65536, while the user-space driver exposes a maximum of 65535. Over that, a submission with a zeroed workgroup dimension should be a no-op. These zeroed counts can reach the dispatch path through an indirect CSD job, whose workgroup counts are only known once the indirect buffer is read and may legitimately be zero, but such scenario should only result in a no-op. Overwrite the indirect CSD job workgroup counts with the indirect BO ones, even if they are zeroed, and don't submit the job to the hardware when any of the workgroup counts is zero, so the job completes immediately instead of running the shader.
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
d223f98f02099b002903b9b22b56febae16ef80d to < b3a8dd72b0d008ff142880b4dbe5ca37dcf962b4affectedd223f98f02099b002903b9b22b56febae16ef80d to < 8b51c5406ad748c3d5575b66b6009b5dbbc08b80affectedd223f98f02099b002903b9b22b56febae16ef80d to < abb069fdf51a9ddabcc1ed125dafe54e2089900baffectedd223f98f02099b002903b9b22b56febae16ef80d to < ad166139d123dc162e8636f0c7962516d04074e1affectedd223f98f02099b002903b9b22b56febae16ef80d to < 9655b56b6de918e1c22b92f3880ae41b052cbd00affectedd223f98f02099b002903b9b22b56febae16ef80d to < 11e6432836394e00d39e468cd514f9ddb66f1e49affectedd223f98f02099b002903b9b22b56febae16ef80d to < 7f93fad5ea0affc9e1505dd0f7596c0fdb496213affected
Linux Linux
Default version status: affected
5.3affected0 to < 5.3unaffected5.15.211 to ≤ 5.15.*unaffected6.1.177 to ≤ 6.1.*unaffected6.6.144 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.18.36 to ≤ 6.18.*unaffected7.0.13 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/b3a8dd72b0d008ff142880b4dbe5ca37dcf962b4 ↗
- https://git.kernel.org/stable/c/8b51c5406ad748c3d5575b66b6009b5dbbc08b80 ↗
- https://git.kernel.org/stable/c/abb069fdf51a9ddabcc1ed125dafe54e2089900b ↗
- https://git.kernel.org/stable/c/ad166139d123dc162e8636f0c7962516d04074e1 ↗
- https://git.kernel.org/stable/c/9655b56b6de918e1c22b92f3880ae41b052cbd00 ↗
- https://git.kernel.org/stable/c/11e6432836394e00d39e468cd514f9ddb66f1e49 ↗
- https://git.kernel.org/stable/c/7f93fad5ea0affc9e1505dd0f7596c0fdb496213 ↗