netdev - Re: [RFC PATCH net-next v2 0/5] netns: allow to identify peer netns

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Message-ID: <CAHA+R7MM04ew=J8sHfSQERwoCAgEDfrGgtgRORqs3ePgtjVYWg@mail.gmail.com>
Date:	Wed, 24 Sep 2014 09:48:11 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	netdev <netdev@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org, David Miller <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [RFC PATCH net-next v2 0/5] netns: allow to identify peer netns

On Wed, Sep 24, 2014 at 9:31 AM, Nicolas Dichtel
<nicolas.dichtel@...nd.com> wrote:
>> I think in this case your ID's are still available, but aren't you
>> providing a new way
>> for the inner netns device to escape which we are trying to avoid?
>
> It's why the ids depend on user ns. Only if user ns are the same we allow to
> get an id for a peer netns.

Too late, userns is relatively new, relying on it breaks our existing
assumption.
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