linux-kernel - Re: [RFC][PATCH 2/4] sunrpc: Use utsnamespaces

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Message-ID: <20090106215324.GD18147@us.ibm.com>
Date:	Tue, 6 Jan 2009 15:53:24 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Matt Helsley <matthltc@...ibm.com>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	linux-nfs@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Chuck Lever <chuck.lever@...cle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Cedric Le Goater <clg@...ibm.com>
Subject: Re: [RFC][PATCH 2/4] sunrpc: Use utsnamespaces

Quoting J. Bruce Fields (bfields@...ldses.org):
> On Tue, Jan 06, 2009 at 02:02:29PM -0600, Serge E. Hallyn wrote:
> > Quoting Matt Helsley (matthltc@...ibm.com):
> > > We can often specify the UTS namespace to use when starting an RPC client.
> > > However sometimes no UTS namespace is available (specifically during system
> > > shutdown as the last NFS mount in a container is unmounted) so fall
> > > back to the initial UTS namespace.
> > 
> > So what happens if we take this patch and do nothing else?
> > 
> > The only potential problem situation will be rpc requests
> > made on behalf of a container in which the last task has
> > exited, right?  So let's say a container did an nfs mount
> > and then exits, causing an nfs umount request.
> > 
> > That umount request will now be sent with the wrong nodename.
> > Does that actually cause problems, will the server use the
> > nodename to try and determine the client sending the request?
> 
> This is just the machine name in the auth_unix credential?  The linux
> server ignores that completely (for the purpose of auth_unix
> authenication, it identifies clients only by source ip address).  I
> suspect other servers also ignore it, but I don't know.

Thanks, that's what i was hoping...

Matt, have you audited the other rpc-based services?  Do any
of them care?

-serge
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