netdev - Re: [PATCH net-next] rtnetlink: validate attributes in do

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Message-Id: <20180605.124505.1306184687202459345.davem@davemloft.net>
Date:   Tue, 05 Jun 2018 12:45:05 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     edumazet@...gle.com, netdev@...r.kernel.org, dvyukov@...gle.com
Subject: Re: [PATCH net-next] rtnetlink: validate attributes in do_setlink()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 5 Jun 2018 09:42:54 -0700

> On 06/05/2018 09:41 AM, David Miller wrote:
>> From: Eric Dumazet <edumazet@...gle.com>
>> Date: Tue,  5 Jun 2018 09:25:19 -0700
>> 
>>> It seems that rtnl_group_changelink() can call do_setlink
>>> while a prior call to validate_linkmsg(dev = NULL, ...) could
>>> not validate IFLA_ADDRESS / IFLA_BROADCAST
>>>
>>> Make sure do_setlink() calls validate_linkmsg() instead
>>> of letting its callers having this responsibility.
>> 
>> But now rtnl_newlink() will validate_linkmsg() twice....
>> 
> 
> Yes, is it a problem ? That is hardly fast path :)

Not a problem, just making sure you were aware.