On Mon, Oct 21, 2024 at 09:37:05AM +0800, mrpre wrote: > The tcp_bpf_recvmsg_parser() function, running in user context, > retrieves seq_copied from tcp_sk without holding the socket lock, and > stores it in a local variable seq. However, the softirq context can > modify tcp_sk->seq_copied concurrently, for example, n tcp_read_sock(). > > As a result, the seq value is stale when it is assigned back to > tcp_sk->copied_seq at the end of tcp_bpf_recvmsg_parser(), leading to > incorrect behavior. Good catch! This makes sense to me. Mind to be more specific on the "incorrect behavior" here? What error or misbehavior did you see? > > Signed-off-by: mrpre <mrpre@xxxxxxx> Please use your real name for SoB, see https://docs.kernel.org/process/submitting-patches.html Thanks.
