linux-kernel - Re: [PATCH V2] netfilter: h323: avoid potential attack

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Message-ID: <20160128141557.74ad75f0@lxorguk.ukuu.org.uk>
Date:	Thu, 28 Jan 2016 14:15:57 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Zhouyi Zhou <yizhouzhou@....ac.cn>,
	Zhouyi Zhou <zhouzhouyi@...il.com>, pablo@...filter.org,
	kaber@...sh.net, kadlec@...ckhole.kfki.hu, davem@...emloft.net,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] netfilter: h323: avoid potential attack

On Thu, 28 Jan 2016 06:00:50 -0800
Eric Dumazet <eric.dumazet@...il.com> wrote:

> On Thu, 2016-01-28 at 21:14 +0800, Zhouyi Zhou wrote:
> 
> > My patch is intend to prevent kernel panic, to prevent reading garbage
> > or read data from a prior frame and leak secrets, the prototypes of the 
> > get_h2x5_addr functions and the functions that call get_h2x5_addr should
> > be changed, should we do this?   
> 
> In term of security, panics are better than allowing attacker to read
> data from other people, like a password.
> 
> BTW, are you able to trigger any panic ?

We have a smattering of panics in this code in bugzilla going back years.

https://bugzilla.kernel.org/show_bug.cgi?id=12473

etc

Alan