CVE-2024-36244: net/sched: taprio: extend minimum interval restriction to entire cycle too

Description

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 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

b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 to < 34d83c3e6e97867ae061d14eb52123404aab1cbcaffected
b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 to < b939d1e04a90248b4cdf417b0969c270ceb992b2affected
b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 to < 91f249b01fe490fce11fbb4307952ca8cce78724affected
b5b73b26b3ca34574124ed7ae9c5ba8391a7f176 to < fb66df20a7201e60f2b13d7f95d031b31a8831d3affected
83bd58952b2b8543d8c48d1453975ab47a0a7504affected
817ff50796c5e364c879596509f83fcba194bb6faffected
5.4.68 to < 5.5affected
5.8.12 to < 5.9affected

Linux Linux

Default version status: affected

5.9affected
0 to < 5.9unaffected
6.1.119 to ≤ 6.1.*unaffected
6.6.33 to ≤ 6.6.*unaffected
6.9.4 to ≤ 6.9.*unaffected
6.10 to ≤ *unaffected

CVE-2024-36244

net/sched: taprio: extend minimum interval restriction to entire cycle too

Description

Affected products

Linux Linux

Linux Linux

References