cve-2021-47163
Vulnerability from cvelistv5
Published
2024-03-25 09:16
Modified
2024-12-19 07:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: wait and exit until all work queues are done On some host, a crash could be triggered simply by repeating these commands several times: # modprobe tipc # tipc bearer enable media udp name UDP1 localip 127.0.0.1 # rmmod tipc [] BUG: unable to handle kernel paging request at ffffffffc096bb00 [] Workqueue: events 0xffffffffc096bb00 [] Call Trace: [] ? process_one_work+0x1a7/0x360 [] ? worker_thread+0x30/0x390 [] ? create_worker+0x1a0/0x1a0 [] ? kthread+0x116/0x130 [] ? kthread_flush_work_fn+0x10/0x10 [] ? ret_from_fork+0x35/0x40 When removing the TIPC module, the UDP tunnel sock will be delayed to release in a work queue as sock_release() can't be done in rtnl_lock(). If the work queue is schedule to run after the TIPC module is removed, kernel will crash as the work queue function cleanup_beareri() code no longer exists when trying to invoke it. To fix it, this patch introduce a member wq_count in tipc_net to track the numbers of work queues in schedule, and wait and exit until all work queues are done in tipc_exit_net().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dba
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa
Impacted products
Vendor Product Version
Linux Linux Version: 4.1
Show details on NVD website

To clipboard 

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}


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