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

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Date:   Fri, 3 Feb 2017 09:00:26 +0900
From:   Lorenzo Colitti <lorenzo@...gle.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Chenbo Feng <chenbofeng.kernel@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Chenbo Feng <fengc@...gle.com>
Subject: Re: [PATCH net-next 2/2] Add a eBPF helper function to retrieve
 socket uid

On Fri, Feb 3, 2017 at 6:32 AM, Daniel Borkmann <daniel@...earbox.net> wrote:
>> +       sk = skb->sk;
>> +       kuid = sock_net_uid(dev_net(skb->dev), sk);
>
>
> Don't you need to test for fullsock? Do you mean something like below?

It should be safe to call sock_net_uid on any type of socket
(including NULL). sk_uid was added to struct sock in 86741ec25462
("net: core: Add a UID field to struct sock.")