netdev - Re: [PATCH net-next v3 2/3] Add a eBPF helper function to retrieve socket uid

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Message-ID: <CAF=yD-J2Z+KqxpnkfZkNUYDR4do8wEBSHims2TTMGgpdwm9SLg@mail.gmail.com>
Date:   Thu, 23 Feb 2017 12:03:58 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Chenbo Feng <chenbofeng.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: Re: [PATCH net-next v3 2/3] Add a eBPF helper function to retrieve
 socket uid

> +BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
> +{
> +       struct sock *sk = sk_to_full_sk(skb->sk);
> +       kuid_t kuid = sock_net_uid(dev_net(skb->dev), sk);

dev_net cannot handle a NULL skb->dev