netdev - Re: [PATCH net-next v4 0/2] net: Introducing socket mark receive socket option

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Date:	Mon, 2 Mar 2015 23:11:28 +0200
From:	Eyal Birger <eyal.birger@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Florian Westphal <fw@...len.de>,
	Willem de Bruijn <willemb@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Shmulik Ladkani <shmulik.ladkani@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v4 0/2] net: Introducing socket mark receive
 socket option

On Mon, Mar 2, 2015 at 10:57 PM, David Miller <davem@...emloft.net> wrote:
> From: Eyal Birger <eyal.birger@...il.com>
> Date: Mon, 2 Mar 2015 22:38:50 +0200
>
>> I can sum up the motivation for this feature as follows:
>>
>> - skb->mark is set by user-space policy. It would make sense for
>> user-space to be
>>   able to query the resolution of that policy on a per packet basis -
>> even if solely for the
>>   purpose of debugging (e.g. fetching this meta-data on packet sockets
>> on the xmit path
>>   in order to debug tc behavior)
>
> It is also set by routing, netfilter, classifier rules installed by the
> administrator.
>
> Therefore it is not universally true that it is safe to allow applications
> to access this value.
>
> I'm not applying this series, it's use case is at best dubious to me and
> there are security/protection concerns as well.

I understand. Thanks.

Would it be considered if access to the mark value was under CAP_NET_ADMIN
similar to setting SO_MARK?
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