netdev - Re: Passive OS fingerprint xtables match.

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Message-ID: <alpine.LSU.2.00.0906051541410.10429@fbirervta.pbzchgretzou.qr>
Date:	Fri, 5 Jun 2009 15:44:21 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Evgeniy Polyakov <zbr@...emap.net>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>
Subject: Re: Passive OS fingerprint xtables match.


On Friday 2009-06-05 15:30, Patrick McHardy wrote:
>Jan Engelhardt wrote:
>> On Friday 2009-06-05 13:54, Patrick McHardy wrote:
>>   
>>>> +
>>>> +		if (optsize > sizeof(opts))
>>>> +			optsize = sizeof(opts);
>>>>       
>>> How can this happen? The doff field can only represent up to 40
>>> bytes of option length.
>>>     
>>
>> Forged packets?
>
>How would that increase the size of the doff field? :)

Ah never mind. Just had to read the RFC... again.
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