linux-kernel - Re: [PATCH] net: Remove a noisy printk

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Date:	Tue, 16 Dec 2008 21:03:15 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
cc:	Dave Jones <davej@...hat.com>, David Miller <davem@...emloft.net>,
	ajax@...hat.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] net: Remove a noisy printk


On Tuesday 2008-12-16 20:59, Jozsef Kadlecsik wrote:
>
>The packets in question are shorter than the IP header. How would those be 
>delivered to the host? On the LAN it might be possible to forge such 
>packets with proper HW address and be delivered. But wouldn't the network 
>card or the stack itself throw away the packets??

Yes.

>> The message is also utterly useless. What kind of action would you take
>> to a few gigabytes of "ipt_hook: happy cracking.\n" ?
>> There's no IP address logged, or any other useful information.
>
>As the packet is shorter than the IP header, what could be logged, besides 
>the fact that something worth to investigate is happening?

Find the offending process? printk current->pid.

'current' should be available in the output path,
but don't quote me on that.
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