netdev - Re: [PATCH] phonet: Check input from user before allocating

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Message-Id: <201204022201.41808.remi@remlab.net>
Date:	Mon, 2 Apr 2012 22:01:40 +0300
From:	"Rémi Denis-Courmont" <remi@...lab.net>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	remi.denis-courmont@...ia.com, davem@...emloft.net,
	davej@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phonet: Check input from user before allocating

Le lundi 2 avril 2012 23:31:00 Sasha Levin, vous avez écrit :
> A phonet packet is limited to USHRT_MAX bytes, this is never checked during
> tx which means that the user can specify any size he wishes, and the kernel
> will attempt to allocate that size.

Does this really solve the problem?  I guess 128kb is still possible with 
USHRT_MAX plus skbuff overhead, which might still trigger OOM relatively 
easily once the memory gets sufficiently fragmented.

How does UDP deal with this?

-- 
Rémi Denis-Courmont
http://www.remlab.net/
http://fi.linkedin.com/in/remidenis
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