netdev - Re: [PATCH net-next] net: preserve sock reference when scrubbing the skb.

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Message-ID: <d1818974-5445-4dc2-1c3c-2b67d2826d6f@gmail.com>
Date:   Tue, 26 Jun 2018 19:35:17 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Cc:     Flavio Leitner <fbl@...hat.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Miller <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        NetFilter <netfilter-devel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: preserve sock reference when scrubbing the
 skb.



On 06/26/2018 05:44 PM, Cong Wang wrote:
 
> With this, a netns could totally throttle a TCP socket in a different
> netns by holding the packets infinitely (e.g. putting them in a loop).
> This is where the isolation breaks.
> 

That is fine, really. Admin error -> Working as intended.

The current scrubbing is simply wrong, not documented, and added by someone
who had absolutely not intended all the side effects.