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

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Date:	Thu, 7 Sep 2006 08:39:47 -0700
From:	Greg KH <greg@...ah.com>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Greg KH <gregkh@...e.de>, torvalds@...l.org, akpm@...l.org,
	Theodore Ts'o <tytso@....edu>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Justin Forbes <jmforbes@...uxtx.org>,
	linux-kernel@...r.kernel.org,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Ang Way Chuang <wcang@....cs.usm.my>,
	Chuck Wolber <chuckw@...ntumlinux.com>, stable@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [stable] [patch 29/37] dvb-core: Proper handling ULE SNDU length of 0

On Thu, Sep 07, 2006 at 02:57:56PM +0200, Marcel Holtmann wrote:
> 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.

So we should not take this patch for 2.6.17.y?  Do you have a different
patch we should use instead?

thanks,

greg k-h
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