netdev - Re: new link failing on duplicate names in different namespaces

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Message-ID: <87sidsok07.fsf@x220.int.ebiederm.org>
Date:	Thu, 26 Feb 2015 07:55:04 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	nicolas.dichtel@...nd.com
Cc:	Cong Wang <cwang@...pensource.com>,
	Eugene Yakubovich <eugene.yakubovich@...eos.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: new link failing on duplicate names in different namespaces

Nicolas Dichtel <nicolas.dichtel@...nd.com> writes:

> Le 26/02/2015 06:56, Cong Wang a écrit :
>> On Wed, Feb 25, 2015 at 9:29 PM, Cong Wang <cwang@...pensource.com> wrote:
> [snip]
>>
>> Please give the attached patch a try.
>>
> It's hard to comment a patch which is sent in attachment
> (see
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/SubmittingPatches#n333).
>
> +				err = rtnl_group_changelink(skb, dest_net,
> It should probably be something like 'link_net ? : dest_net' instead of
> dest_net.
>
> I also don't understand why you need two label ('out' and 'err'). I think one is
> enough (link_net is initialized to NULL for this purpose).
> And why not keeping the same name as before, ie 'out'? It will minimize the
> patch.

Sigh.

We can not give the guarantee that a new network device will only live
in and have a unique name in a single network namespace until we get
rid of dev_change_net_namespace in the code.

Cong your patch does not get rid of that and so is insufficient to solve
this problem and buggy.

Eric

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