Advisory Published
CVE Published
Updated

CVE-2023-52638: can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock

First published: Wed Apr 03 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock The following 3 locks would race against each other, causing the deadlock situation in the Syzbot bug report: - j1939_socks_lock - active_session_list_lock - sk_session_queue_lock A reasonable fix is to change j1939_socks_lock to an rwlock, since in the rare situations where a write lock is required for the linked list that j1939_socks_lock is protecting, the code does not attempt to acquire any more locks. This would break the circular lock dependency, where, for example, the current thread already locks j1939_socks_lock and attempts to acquire sk_session_queue_lock, and at the same time, another thread attempts to acquire j1939_socks_lock while holding sk_session_queue_lock. NOTE: This patch along does not fix the unregister_netdevice bug reported by Syzbot; instead, it solves a deadlock situation to prepare for one or more further patches to actually fix the Syzbot bug, which appears to be a reference counting problem within the j1939 codebase. [mkl: remove unrelated newline change]

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
redhat/kernel<5.15.149
5.15.149
redhat/kernel<6.1.79
6.1.79
redhat/kernel<6.6.18
6.6.18
redhat/kernel<6.7.6
6.7.6
redhat/kernel<6.8
6.8
debian/linux<=5.10.223-1<=5.10.226-1
6.1.115-1
6.1.112-1
6.11.5-1
6.11.7-1

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