Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d223f98f02099b002903b9b22b56febae16ef80d before b3a8dd72b0d008ff142880b4dbe5ca37dcf962b4; affected d223f98f02099b002903b9b22b56febae16ef80d before 8b51c5406ad748c3d5575b66b6009b5dbbc08b80; affected d223f98f02099b002903b9b22b56febae16ef80d before abb069fdf51a9ddabcc1ed125dafe54e2089900b; affected d223f98f02099b002903b9b22b56febae16ef80d before ad166139d123dc162e8636f0c7962516d04074e1; affected d223f98f02099b002903b9b22b56febae16ef80d before 9655b56b6de918e1c22b92f3880ae41b052cbd00; affected d223f98f02099b002903b9b22b56febae16ef80d before 11e6432836394e00d39e468cd514f9ddb66f1e49; affected d223f98f02099b002903b9b22b56febae16ef80d before 7f93fad5ea0affc9e1505dd0f7596c0fdb496213 |
| Linux / Linux | affected 5.3; unaffected 0 before 5.3; unaffected 5.15.211 through 5.15.*; unaffected 6.1.177 through 6.1.*; unaffected 6.6.144 through 6.6.*; unaffected 6.12.95 through 6.12.*; unaffected 6.18.36 through 6.18.*; unaffected 7.0.13 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
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