linux-kernel - Re: [flame^Wreview] net: netprio_cgroup: rework update socket logic

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Message-ID: <50293224.90803@intel.com>
Date:	Mon, 13 Aug 2012 09:58:12 -0700
From:	John Fastabend <john.r.fastabend@...el.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Neil Horman <nhorman@...driver.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [flame^Wreview] net: netprio_cgroup: rework update socket logic

[...]

> HOWEVER, it still doesn't address more fundamental problem - somebody
> creating a socket and passing it to you in SCM_RIGHTS datagram will
> leave you with a socket you can do IO on, still tagged according to who
> had created it.
>
> AFAICS, the whole point of that exercise was to allow third-party changing
> the priorities of traffic on sockets already created by a process we now
> move to a different cgroup.  Consider e.g. this:

Correct that is the point of the exercise.

To fix this specific case we could add a call to sock_update_netprioidx
in scm_recv to set the sk_cgrp_prioidx value.
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