On Mon, Feb 6, 2017 at 11:17 AM, Chenbo Feng
<chenbofeng.ker...@gmail.com> wrote:
> +BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
> +{
> + return skb->sk ? sock_gen_cookie(skb->sk) : 0;
> +}
> +Does this code need to increment the socket refcount, or call ACCESS_ONCE to get skb->sk? The socket filter codepath should be safe, but if this function is called in xt_ebpf, could it race with something that sets skb->sk to null?
