netdev - Re: Fwd: Simple kernel attack using socketpair. easy, 100% reproductiblle, works under guest. no way to protect :(

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Message-ID: <4CEF64A4.5080802@cn.fujitsu.com>
Date:	Fri, 26 Nov 2010 15:41:24 +0800
From:	Shan Wei <shanwei@...fujitsu.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Марк Коренберг 
	<socketpair@...il.com>, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org
Subject: Re: Fwd: Simple kernel attack using socketpair. easy, 100% reproductiblle,
 works under guest. no way to protect :(

Eric Dumazet wrote, at 11/25/2010 10:11 PM:
> @@ -1845,6 +1871,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
>  		unix_state_lock(sk);
>  		skb = skb_dequeue(&sk->sk_receive_queue);
>  		if (skb == NULL) {
> +			unix_sk(sk)->recursion_level = 0;

For SOCK_SEQPACKET type, no need to clear recursion_level counter?
 

-- 
Best Regards
-----
Shan Wei
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