linux-kernel - Re: [patch 29/37] dvb-core: Proper handling ULE SNDU length of 0

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Date:	Thu, 07 Sep 2006 14:57:56 +0200
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Greg KH <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>, torvalds@...l.org,
	akpm@...l.org, alan@...rguk.ukuu.org.uk,
	Ang Way Chuang <wcang@....cs.usm.my>
Subject: Re: [patch 29/37] dvb-core: Proper handling ULE SNDU length of 0

Hi Greg,

> ULE (Unidirectional Lightweight Encapsulation RFC 4326) decapsulation
> code has a bug that allows an attacker to send a malformed ULE packet
> with SNDU length of 0 and bring down the receiving machine. This patch
> fix the bug and has been tested on version 2.6.17.11. This bug is 100%
> reproducible and the modified source code (GPL) used to produce this bug
> will be posted on http://nrg.cs.usm.my/downloads.htm shortly.  The
> kernel will produce a dump during CRC32 checking on faulty ULE packet.

the upstream code changed for 2.6.18. It has a different way of
addressing this issue, but it also changes a lot of other stuff in the
whole code. However it might be worth looking at it, because the
upstream code might be still vulnerable.

Regards

Marcel


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