netdev - Re: [PATCH net-next-2.6] netlink: netlink

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Message-ID: <1281940172.2942.81.camel@edumazet-laptop>
Date:	Mon, 16 Aug 2010 08:29:32 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] netlink: netlink_recvmsg() fix

Le lundi 16 août 2010 à 08:22 +0200, Johannes Berg a écrit :
> On Mon, 2010-08-16 at 08:10 +0200, Eric Dumazet wrote:
> 
> > We'll find another way to address the problem.
> 
> For my understanding: The problem is that the save/restore of the
> frag_list skb can race so a second reader will not see the frag_list skb
> because it gets there while it's NULL. This happens with MSG_PEEK, or
> with clones of the SKB since skb_shared_info is invariant across clones.
> 
> Correct?
> 

Yes

I believe we should have a mutual exclusion for the critical section.

(setting pointer to NULL, ...., setting pointer back to its orig value)



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