Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net/sched: taprio: extend minimum interval restriction to entire cycle too It is possible for syzbot to side-step the restriction imposed by the blamed commit in the Fixes: tag, because the taprio UAPI permits a cycle-time different from (and potentially shorter than) the sum of entry intervals. We need one more restriction, which is that the cycle time itself must be larger than N * ETH_ZLEN bit times, where N is the number of schedule entries. This restriction needs to apply regardless of whether the cycle time came from the user or was the implicit, auto-calculated value, so we move the existing "cycle == 0" check outside the "if "(!new->cycle_time)" branch. This way covers both conditions and scenarios. Add a selftest which illustrates the issue triggered by syzbot.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 before 34d83c3e6e97867ae061d14eb52123404aab1cbc; affected b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 before b939d1e04a90248b4cdf417b0969c270ceb992b2; affected b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 before 91f249b01fe490fce11fbb4307952ca8cce78724; affected b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 before fb66df20a7201e60f2b13d7f95d031b31a8831d3; affected 83bd58952b2b8543d8c48d1453975ab47a0a7504; affected 817ff50796c5e364c879596509f83fcba194bb6f; affected 5.4.68 before 5.5; affected 5.8.12 before 5.9 |
| Linux / Linux | affected 5.9; unaffected 0 before 5.9; unaffected 6.1.119 through 6.1.*; unaffected 6.6.33 through 6.6.*; unaffected 6.9.4 through 6.9.*; unaffected 6.10 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/34d83c3e6e97867ae061d14eb52123404aab1cbc
- https://git.kernel.org/stable/c/b939d1e04a90248b4cdf417b0969c270ceb992b2
- https://git.kernel.org/stable/c/91f249b01fe490fce11fbb4307952ca8cce78724
- https://git.kernel.org/stable/c/fb66df20a7201e60f2b13d7f95d031b31a8831d3
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.