Re: [PATCH bpf-next v1 1/3] bpf, sockmap: avoid using sk_socket after free
From: Martin KaFai Lau <martin.lau@linux.dev>
Date: 2025-02-27 23:04:38
Also in:
bpf, linux-kselftest, lkml
On 2/26/25 5:22 AM, Jiayuan Chen wrote:
Use RCU lock to protect sk_socket, preventing concurrent close and release
by another thread.
Because TCP/UDP are already within a relatively large critical section:
'''
ip_local_deliver_finish
rcu_read_lock
ip_protocol_deliver_rcu
tcp_rcv/udp_rcv
rcu_read_unlock
'''
Adding rcu_read_{un}lock() at the entrance and exit of sk_data_ready
will not increase performance overhead.Can it use a Fixes tag?