Description
In the Linux kernel, the following vulnerability has been resolved: media: vivid: check for vb2_is_busy() when toggling caps The vivid_update_format_cap/out() functions must only be called if the capture/output queue are not busy. But for the controls that select the CROP/COMPOSE/SCALE capability that is not checked. Only when streaming starts will they be set to 'grabbed' and it is impossible to change the control, but between REQBUFS and STREAMON you are still allowed to set these controls. Since vivid_update_format_cap/out will change the format, this can cause unexpected results. Besides adding these checks, also add a WARN_ON in vivid_update_format_cap/out() if the queue is busy. I'm 90% certain that this is the cause of this syzbot bug: https://syzkaller.appspot.com/bug?extid=dac8f5eaa46837e97b89 But since we never have reproducers, it is hard to be certain. In any case, these checks are needed regardless.
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
73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < 0a820f03727b509b887f3216a574062948761f34affected73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < bbc96bc75de0fcd9bb6ac48798b206e3b09ec865affected73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < 6a5bc8aea111ccbca71ef2b9c868d5c81f2e89deaffected73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < a9cd0e8fb0b21faaa71199d9d3feb305c18ff576affected73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < abaec6747304581f8d4a9936352fa10e13325f07affected73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < 492c97cb50feaa60ccd7792d3d6b904ed8ec61bfaffected73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < daf2d92669b4a659d805d88d811161c70cd325eeaffected73c3f48230cda01402ae189b05d56f1f7e0d53c9 to < c2d1a2130c93f6d758af58590b86b2254c7a1decaffected
Linux Linux
Default version status: affected
3.18affected0 to < 3.18unaffected5.10.265 to ≤ 5.10.*unaffected5.15.216 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.148 to ≤ 6.6.*unaffected6.12.101 to ≤ 6.12.*unaffected6.18.42 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/0a820f03727b509b887f3216a574062948761f34 ↗
- https://git.kernel.org/stable/c/bbc96bc75de0fcd9bb6ac48798b206e3b09ec865 ↗
- https://git.kernel.org/stable/c/6a5bc8aea111ccbca71ef2b9c868d5c81f2e89de ↗
- https://git.kernel.org/stable/c/a9cd0e8fb0b21faaa71199d9d3feb305c18ff576 ↗
- https://git.kernel.org/stable/c/abaec6747304581f8d4a9936352fa10e13325f07 ↗
- https://git.kernel.org/stable/c/492c97cb50feaa60ccd7792d3d6b904ed8ec61bf ↗
- https://git.kernel.org/stable/c/daf2d92669b4a659d805d88d811161c70cd325ee ↗
- https://git.kernel.org/stable/c/c2d1a2130c93f6d758af58590b86b2254c7a1dec ↗