linux-kernel - Re: [PATCH] nfsd: check passed socket's net matches NFSd superblock's one

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Date:	Sat, 15 Feb 2014 09:51:20 +0800
From:	Weng Meiling <wengmeiling.weng@...wei.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
CC:	Stanislav Kinsbursky <skinsbursky@...allels.com>, <greg@...ah.com>,
	<linux-nfs@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devel@...nvz.org>
Subject: Re: [PATCH] nfsd: check passed socket's net matches NFSd superblock's
 one

Hi Bruce,

The upstream has merged your git tree for-3.14, but there is no this patch?
Do you forget this patch?

Thanks!
Weng Meiling


On 2014/1/4 6:22, J. Bruce Fields wrote:
> On Mon, Dec 30, 2013 at 05:23:59PM +0300, Stanislav Kinsbursky wrote:
>> There could be a case, when NFSd file system is mounted in network, different
>> to socket's one, like below:
>>
>> "ip netns exec" creates new network and mount namespace, which duplicates NFSd
>> mount point, created in init_net context. And thus NFS server stop in nested
>> network context leads to RPCBIND client destruction in init_net.
>> Then, on NFSd start in nested network context, rpc.nfsd process creates socket
>> in nested net and passes it into "write_ports", which leads to RPCBIND sockets
>> creation in init_net context because of the same reason (NFSd monut point was
>> created in init_net context). An attempt to register passed socket in nested
>> net leads to panic, because no RPCBIND client present in nexted network
>> namespace.
> 
> So it's the attempt to use a NULL ->rpcb_local_clnt4?
> 
> Interesting, thanks--applying with a minor fix to logged message.
> 
> --b.
> 



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