Description
In the Linux kernel, the following vulnerability has been resolved: virtio_input: stop callbacks before unregistering input device virtinput_remove() unregisters the input device before resetting the virtio device. virtinput_recv_events() drops vi->lock around input_event(), so clearing vi->ready does not stop a callback that passed the entry check. It can still use vi->idev, requeue buffers and kick the queue. Reset first, as virtinput_freeze() already does. With the preceding core change, reset waits for callbacks before input_unregister_device() can free vi->idev. Recheck vi->ready after taking the lock again: keep draining completed events so an input packet is not truncated, but stop requeueing buffers and kicking the queue. With evdev attached, input_unregister_handle() currently waits for an RCU grace period, which also waits out IRQ callbacks. This masks the lifetime bug on PCI and MMIO, but does not protect sleepable callbacks on other transports.
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
271c865161c57cfabca45b93eaa712b19da365bc to < 3ae729b1f8ab81d1244061872db2fb0ebb110d2aaffected271c865161c57cfabca45b93eaa712b19da365bc to < 81073bca2062c916c818f2744fbab545a5c4982baffected271c865161c57cfabca45b93eaa712b19da365bc to < 8226aeee9b9a94cd699fbb51cb230feff46cfaf2affected271c865161c57cfabca45b93eaa712b19da365bc to < a3ba86a270dd87460759214046dc7cbd409ac711affected271c865161c57cfabca45b93eaa712b19da365bc to < 5378f7945856a5ed88e6f9850bc7a68f54090135affected271c865161c57cfabca45b93eaa712b19da365bc to < d7808b37da0a619cf1fa541c2384e783fecc2480affected
Linux Linux
Default version status: affected
4.1affected0 to < 4.1unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2.7 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/3ae729b1f8ab81d1244061872db2fb0ebb110d2a ↗
- https://git.kernel.org/stable/c/81073bca2062c916c818f2744fbab545a5c4982b ↗
- https://git.kernel.org/stable/c/8226aeee9b9a94cd699fbb51cb230feff46cfaf2 ↗
- https://git.kernel.org/stable/c/a3ba86a270dd87460759214046dc7cbd409ac711 ↗
- https://git.kernel.org/stable/c/5378f7945856a5ed88e6f9850bc7a68f54090135 ↗
- https://git.kernel.org/stable/c/d7808b37da0a619cf1fa541c2384e783fecc2480 ↗