netdev - Re: [RFC] bridge: STP timer management range checking

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Message-ID: <20080901093827.24eec86f@lxorguk.ukuu.org.uk>
Date:	Mon, 1 Sep 2008 09:38:27 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Stephen Hemminger <stephen.hemminger@...tta.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	David Miller <davem@...emloft.net>,
	Dushan Tcholich <dusanc@...il.com>,
	Francois Romieu <romieu@...zoreil.com>,
	Robert Hancock <hancockr@...w.ca>, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	bridge@...ts.linux-foundation.org
Subject: Re: [RFC] bridge: STP timer management range checking

> > Seems bogus extra code to me - stops things working that should be
> > allowed too.
> >   
> The timer configuration is propagated in network protocol, so 
> misconfigured Linux box
> could survive but effect other devices on the network that are less 
> robust. Maybe the

That would be irrelevant. CAP_NET_ADMIN lets you make that size mess
anyway.

> small values would cause some other bridge to crash, go infinite loop, ...
> More likely robust devices might ignore our packets (because values out 
> of range), leading to
> routing loops and other disasters.

Spamming tree isn't secure, news at 11.

> The kernel does need to stop administrative settings from taking out a 
> network. 

If you have CAP_NET_ADMIN you can trivially take out the network unless
it is properly switched.

Now you might want your pretty little GUI and/or config tools to warn
people that their configuration is outside 802 specs but that is a
different matter altogether

Alan
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