netdev - Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root

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Message-ID: <50255808.6080208@parallels.com>
Date:	Fri, 10 Aug 2012 22:50:48 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	Pavel Emelianov <xemul@...allels.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"bfields@...ldses.org" <bfields@...ldses.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
	"devel@...nvz.org" <devel@...nvz.org>
Subject: Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root

10.08.2012 22:15, H. Peter Anvin пишет:
> On 08/10/2012 05:57 AM, Stanislav Kinsbursky wrote:
>> Today, there is a problem in connecting of local SUNRPC thansports. These
>> transports uses UNIX sockets and connection itself is done by rpciod
>> workqueue.
>> But UNIX sockets lookup is done in context of process file system root. I.e.
>> all local thunsports are connecting in rpciod context.
>> This works nice until we will try to mount NFS from process with other root -
>> for example in container. This container can have it's own (nested) root and
>> rcpbind process, listening on it's own unix sockets. But NFS mount attempt in
>> this container will register new service (Lockd for example) in global rpcbind
>> - not containers's one.
>>
>> This patch set introduces kernel connect helper for UNIX stream sockets and
>> modifies unix_find_other() to be able to search from specified root.
>> It also replaces generic socket connect call for local transports by new
>> helper in SUNRPC layer.
>>
>> The following series implements...
> On that whole subject...
>
> Do we need a Unix domain socket equivalent to openat()?

It looks like sys_connectat () and sys_bindat () could be an organic 
part on openat () and friends family.
But currently I don't have any usage example for them in hands.  And the 
main problem here, that this syscalls can be used only for unix sockets.

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