Description
In the Linux kernel, the following vulnerability has been resolved: packet: synchronize pressure clearing with ring reconfiguration packet_set_ring() updates the RX ring state under sk_receive_queue.lock, but used to publish the tpacket receive mode through po->prot_hook.func after releasing that lock. packet_poll() and packet_recvmsg() can then run the pressure clearing path after the ring has been cleared while still seeing tpacket_rcv, causing __packet_rcv_has_room() to dereference stale or NULL ring storage. Move the existing receive hook assignment into the same sk_receive_queue.lock section as the ring state update. Keep the assignment otherwise unchanged, including on TX ring reconfiguration, to avoid adding behavior changes that are not required for the fix. Serialize packet_recvmsg() pressure clearing with the same queue lock only after PACKET_SOCK_PRESSURE has been observed. If the flag is clear and the socket has moved away from tpacket_rcv, packet_set_ring() has already detached the socket and waited for synchronize_net(), so no new packet input can set the flag again. packet_poll() already holds sk_receive_queue.lock, so it uses the new unlocked helper directly.
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
2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < bf3c8e86bc8ad111be3f3136125e255344bcb3daaffected2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < 8cfb2e71926a682f36c4240067d424074dd8f70faffected2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < f015c9de92b731814059a343b765c60c0196225caffected2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < cf8189b82bb93f219ab740e0346c919ad65ada62affected2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < ad740b4990347521f0db260d381f9f74e7b340baaffected2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < 2c7b5eb87b2b288cdbde825f21d2b83b2f5da747affected2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < a08196c3cc105947746ec21309edfbb60275fcdbaffected2ccdbaa6d55b0656244ba57c4b56765a0af76c0a to < 1a35da325cac4d5bcad76a2aa943408a6f1d9000affected
Linux Linux
Default version status: affected
4.2affected0 to < 4.2unaffected5.10.267 to ≤ 5.10.*unaffected5.15.218 to ≤ 5.15.*unaffected6.1.185 to ≤ 6.1.*unaffected6.6.152 to ≤ 6.6.*unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/bf3c8e86bc8ad111be3f3136125e255344bcb3da ↗
- https://git.kernel.org/stable/c/8cfb2e71926a682f36c4240067d424074dd8f70f ↗
- https://git.kernel.org/stable/c/f015c9de92b731814059a343b765c60c0196225c ↗
- https://git.kernel.org/stable/c/cf8189b82bb93f219ab740e0346c919ad65ada62 ↗
- https://git.kernel.org/stable/c/ad740b4990347521f0db260d381f9f74e7b340ba ↗
- https://git.kernel.org/stable/c/2c7b5eb87b2b288cdbde825f21d2b83b2f5da747 ↗
- https://git.kernel.org/stable/c/a08196c3cc105947746ec21309edfbb60275fcdb ↗
- https://git.kernel.org/stable/c/1a35da325cac4d5bcad76a2aa943408a6f1d9000 ↗