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

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Date:	Fri, 15 Sep 2006 20:18:23 +0200
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Michael Krufky <mkrufky@...uxtv.org>
Cc:	Greg KH <gregkh@...e.de>, 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>,
	v4l-dvb maintainer list <v4l-dvb-maintainer@...uxtv.org>,
	Marcel Siegert <mws@...uxtv.org>
Subject: Re: [patch 29/37] dvb-core: Proper handling ULE SNDU length of 0

Hi Michael,

> >>>> Can we hold off on this until the 2.6.17.13 review cycle?  This patch
> >>>> has not been sent to the linux-dvb mailing list, it has not been
> >>>> reviewed or tested except for the Author and Marcel.
> >>> Yes, I've now moved it, thanks.
> >> Marcel Siegert and I spoke about this today --  We are doing things a
> >> bit differently for 2.6.18 and later, but this patch is appropriate for
> >> 2.6.17.y
> > 
> > so this means it is fixed in 2.6.18 or is it still vulnerable. If it is
> > still vulnerable, then we need a fix. And we need it now.
> 
> 2.6.18 should not be vulnerable.  See the following changeset in Linus'
> tree:
> 
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;h=8859ab74f0fe4c65c8e75b9350a2a0b138615525;hp=9fd87521a1639bd3dae51dcdce48545614d41a85;hb=18232ca61b4c73b849850200a5e6ec40517f35ab;f=drivers/media/dvb/dvb-core/dvb_net.c
> 
> Quoting MWS from irc:
> 
> if the len is smaller than 4 or if dbit set smaller than 4+ealen, just
> get rid of that packet and interpret as error. the 2.6.18 is not letting
> them through if they are < sizeof(5), so 4 byte packets would be ignored.

I saw the changeset in the current 2.6.18-rc kernel and this was the
reason for me asking. I don't have the hardware to reproduce this, but
if you say that the final 2.6.18 kernel will not be vulnerable, then I
take your word for it.

Regards

Marcel


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