netdev - Re: [PATCH net-next-2.6] filter: add a security check at install time

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Date:	Thu, 2 Dec 2010 18:10:05 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, hagen@...u.net,
	wirelesser@...il.com, netdev@...r.kernel.org,
	Dan Rosenberg <drosenberg@...curity.com>
Subject: Re: [PATCH net-next-2.6] filter: add a security check at install time

On Thu, Dec 2, 2010 at 5:54 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le jeudi 02 décembre 2010 à 17:10 +0800, Changli Gao a écrit :
>>
>> Oops. We were wrong. The RAM of BPF machine is initialized to 0. So
>> loading from a cell, in which no value is stored before, is valid. So
>> we can't prevent the following instructions.
>>
>
> It was not 'initialized to 0', thats the point of previous patches.
>

I checked the implementation of bpf in FreeBSD, and found RAM isn't
initialized to 0. Then it could not be a common 'feature', and no
application relies on it. Maybe we can drop this 'feature' added by
accident, and break the 'ABI'.

Now, I agree with you totally. Thank for your explaining..

Acked-by: Changli Gao <xiaosuo@...il.com>

>
> (By the way, I believe FreeBSD has the security problem Dan reported to us)

Yes. it doesn't do this check.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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