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Subject: Re: [PATCH] bpf: Add bpf_skb_get_sock_comm() helper
To:     Jiang Yu <jyu.jiang@vivo.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        Andrii Nakryiko <andriin@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@chromium.org>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Sitnicki <jakub@cloudflare.com>,
        zhanglin <zhang.lin16@zte.com.cn>,
        Kees Cook <keescook@chromium.org>,
        Andrey Ignatov <rdna@fb.com>,
        Quentin Monnet <quentin@isovalent.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, bpf@vger.kernel.org
Cc:     opensource.kernel@vivo.com
References: <20200810131014.12057-1-jyu.jiang@vivo.com>
From:   Eric Dumazet <eric.dumazet@gmail.com>
Message-ID: <315a12d8-abd9-f9d3-a1b2-bcec8598a984@gmail.com>
Date:   Mon, 10 Aug 2020 07:56:08 -0700
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On 8/10/20 6:09 AM, Jiang Yu wrote:
> skb distinguished by uid can only recorded to user who consume them.
> in many case, skb should been recorded more specific to process who
> consume them. E.g, the unexpected large data traffic of illegal process
> in metered network.
> 
> this helper is used in tracing task comm of the sock to which a skb
> belongs.
> 
> Signed-off-by: Jiang Yu <jyu.jiang@vivo.com>

fd can be passed from one process to another.