Description
In the Linux kernel, the following vulnerability has been resolved: configfs: fix a race in configfs_{,un}register_subsystem() When configfs_register_subsystem() or configfs_unregister_subsystem() is executing link_group() or unlink_group(), it is possible that two processes add or delete list concurrently. Some unfortunate interleavings of them can cause kernel panic. One of cases is: A --> B --> C --> D A <-- B <-- C <-- D delete list_head *B | delete list_head *C --------------------------------|----------------------------------- configfs_unregister_subsystem | configfs_unregister_subsystem unlink_group | unlink_group unlink_obj | unlink_obj list_del_init | list_del_init __list_del_entry | __list_del_entry __list_del | __list_del // next == C | next->prev = prev | | next->prev = prev prev->next = next | | // prev == B | prev->next = next Fix this by adding mutex when calling link_group() or unlink_group(), but parent configfs_subsystem is NULL when config_item is root. So I create a mutex configfs_subsystem_mutex.
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
7063fbf2261194f72ee75afca67b3b38b554b5fa to < 40805099af11f68c5ca7dbcfacf455da8f99f622affected7063fbf2261194f72ee75afca67b3b38b554b5fa to < d1654de19d42f513b6cfe955cc77e7f427e05a77affected7063fbf2261194f72ee75afca67b3b38b554b5fa to < a37024f7757c25550accdebf49e497ad6ae239feaffected7063fbf2261194f72ee75afca67b3b38b554b5fa to < b7e2b91fcb5c78c414e33dc8d50642e307ca0c5aaffected7063fbf2261194f72ee75afca67b3b38b554b5fa to < a7ab53d3c27dfe83bb594456b9f38a37796ec39baffected7063fbf2261194f72ee75afca67b3b38b554b5fa to < e7a66dd2687758718eddd79b542a95cf3aa488ccaffected7063fbf2261194f72ee75afca67b3b38b554b5fa to < 3aadfd46858b1f64d4d6a0654b863e21aabff975affected7063fbf2261194f72ee75afca67b3b38b554b5fa to < 84ec758fb2daa236026506868c8796b0500c047daffected
Linux Linux
Default version status: affected
2.6.16affected0 to < 2.6.16unaffected4.9.304 to ≤ 4.9.*unaffected4.14.269 to ≤ 4.14.*unaffected4.19.232 to ≤ 4.19.*unaffected5.4.182 to ≤ 5.4.*unaffected5.10.103 to ≤ 5.10.*unaffected5.15.26 to ≤ 5.15.*unaffected5.16.12 to ≤ 5.16.*unaffected5.17 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/40805099af11f68c5ca7dbcfacf455da8f99f622 ↗
- https://git.kernel.org/stable/c/d1654de19d42f513b6cfe955cc77e7f427e05a77 ↗
- https://git.kernel.org/stable/c/a37024f7757c25550accdebf49e497ad6ae239fe ↗
- https://git.kernel.org/stable/c/b7e2b91fcb5c78c414e33dc8d50642e307ca0c5a ↗
- https://git.kernel.org/stable/c/a7ab53d3c27dfe83bb594456b9f38a37796ec39b ↗
- https://git.kernel.org/stable/c/e7a66dd2687758718eddd79b542a95cf3aa488cc ↗
- https://git.kernel.org/stable/c/3aadfd46858b1f64d4d6a0654b863e21aabff975 ↗
- https://git.kernel.org/stable/c/84ec758fb2daa236026506868c8796b0500c047d ↗