Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: move list and spinlock inits from bind to alloc There was an issue when you did the following: - setup and bind an hid gadget - open /dev/hidg0 - use the resulting fd in EPOLL_CTL_ADD - unbind the UDC - bind the UDC - use the fd in EPOLL_CTL_DEL When CONFIG_DEBUG_LIST was enabled, a list_del corruption was reported within remove_wait_queue (via ep_remove_wait_queue). After some debugging I found out that the queues, which f_hid registers via poll_wait were the problem. These were initialized using init_waitqueue_head inside hidg_bind. So effectively, the bind function re-initialized the queues while there were still items in them. The solution is to move the initialization from hidg_bind to hidg_alloc to extend their lifetimes to the lifetime of the function instance. Additionally, I found many other possibly problematic init calls in the bind function, which I moved as well.
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
cb382536052fcc7713988869b54a81137069e5a9 to < 13440c0db227c5db01da751ed966dde4cdd2ea18affectedcb382536052fcc7713988869b54a81137069e5a9 to < de93e0862169b5539e00c2b9980b93fd80c37c0daffectedcb382536052fcc7713988869b54a81137069e5a9 to < 81aee4500055876883658b024b6fb61801afe134affectedcb382536052fcc7713988869b54a81137069e5a9 to < 8ec6a58586f195a88479edcdb0b8027c39f12d03affectedcb382536052fcc7713988869b54a81137069e5a9 to < f7d00ee1c8082c8a134340aaf16d71a27e29c362affectedcb382536052fcc7713988869b54a81137069e5a9 to < 5d1bb391ceeebb28327703dd07af8c6324af298faffectedcb382536052fcc7713988869b54a81137069e5a9 to < 26a879a41ed960b3fb4ec773ef2788c515c0e488affectedcb382536052fcc7713988869b54a81137069e5a9 to < 4e0a88254ad59f6c53a34bf5fa241884ec09e8b2affected
Linux Linux
Default version status: affected
3.19affected0 to < 3.19unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.169 to ≤ 6.1.*unaffected6.6.135 to ≤ 6.6.*unaffected6.12.81 to ≤ 6.12.*unaffected6.18.22 to ≤ 6.18.*unaffected6.19.12 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18 ↗
- https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d ↗
- https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134 ↗
- https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03 ↗
- https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362 ↗
- https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f ↗
- https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488 ↗
- https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2 ↗