Description
In the Linux kernel, the following vulnerability has been resolved: net/rds: Fix circular locking dependency in rds_tcp_tune syzbot reported a circular locking dependency in rds_tcp_tune() where sk_net_refcnt_upgrade() is called while holding the socket lock: ====================================================== WARNING: possible circular locking dependency detected ====================================================== kworker/u10:8/15040 is trying to acquire lock: ffffffff8e9aaf80 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_cache_noprof+0x4b/0x6f0 but task is already holding lock: ffff88805a3c1ce0 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at: rds_tcp_tune+0xd7/0x930 The issue occurs because sk_net_refcnt_upgrade() performs memory allocation (via get_net_track() -> ref_tracker_alloc()) while the socket lock is held, creating a circular dependency with fs_reclaim. Fix this by moving sk_net_refcnt_upgrade() outside the socket lock critical section. This is safe because the fields modified by the sk_net_refcnt_upgrade() call (sk_net_refcnt, ns_tracker) are not accessed by any concurrent code path at this point. v2: - Corrected fixes tag - check patch line wrap nits - ai commentary nits
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
3a58f13a881ed351198ffab4cf9953cf19d2ab3a to < ce5be6703afd2ac2ff7dabd397137d71d22d4bc3affected3a58f13a881ed351198ffab4cf9953cf19d2ab3a to < 8babb271403378ba6836f6c8599c5313d0e2355daffected3a58f13a881ed351198ffab4cf9953cf19d2ab3a to < 8519e6883a942e510f33a0e634e27bcc3a844a40affected3a58f13a881ed351198ffab4cf9953cf19d2ab3a to < 6ce948fa54599f369ff7fe8b793a6aae4b0762b2affected3a58f13a881ed351198ffab4cf9953cf19d2ab3a to < 026bbaeeab9e04534ee58882b6447300629b42f6affected3a58f13a881ed351198ffab4cf9953cf19d2ab3a to < 6a877ececd6daa002a9a0002cd0fbca6592a9244affected2a6efabed754c9dcf27e6def71317b374f58a852affected5.17.7 to < 5.18affected
Linux Linux
Default version status: affected
5.18affected0 to < 5.18unaffected6.1.191 to ≤ 6.1.*unaffected6.6.130 to ≤ 6.6.*unaffected6.12.77 to ≤ 6.12.*unaffected6.18.17 to ≤ 6.18.*unaffected6.19.7 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/ce5be6703afd2ac2ff7dabd397137d71d22d4bc3 ↗
- https://git.kernel.org/stable/c/8babb271403378ba6836f6c8599c5313d0e2355d ↗
- https://git.kernel.org/stable/c/8519e6883a942e510f33a0e634e27bcc3a844a40 ↗
- https://git.kernel.org/stable/c/6ce948fa54599f369ff7fe8b793a6aae4b0762b2 ↗
- https://git.kernel.org/stable/c/026bbaeeab9e04534ee58882b6447300629b42f6 ↗
- https://git.kernel.org/stable/c/6a877ececd6daa002a9a0002cd0fbca6592a9244 ↗