netdev - Re: Passive OS fingerprint xtables match.

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Message-ID: <alpine.LSU.2.00.0906051508300.17010@fbirervta.pbzchgretzou.qr>
Date:	Fri, 5 Jun 2009 15:10:10 +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 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?

>> +	printk(KERN_INFO "Started passive OS fingerprint matching module.\n");
>
> Please no messages on successful module load. Or at least
> not when statically built, but preferrably not at all.

By that logic should not the messages-on-load for netfilter be removed? ;-)

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