linux-kernel - Re: [ 02/37] lockd: use rpc clients cl

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Message-ID: <4FA345DA4F4AE44899BD2B03EEEC2FA9092890D7@SACEXCMBX04-PRD.hq.netapp.com>
Date:	Mon, 22 Oct 2012 17:02:52 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Ben Hutchings <ben@...adent.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	Stanislav Kinsbursky <skinsbursky@...allels.com>
Subject: Re: [ 02/37] lockd: use rpc clients cl_nodename for id encoding

On Sun, 2012-10-21 at 09:26 -0700, Greg Kroah-Hartman wrote:
> On Sat, Oct 20, 2012 at 12:15:18AM +0100, Ben Hutchings wrote:
> > On Thu, Oct 18, 2012 at 08:16:25PM -0700, Greg Kroah-Hartman wrote:
> > > 3.0-stable review patch.  If anyone has any objections, please let me know.
> > > 
> > > ------------------
> > > 
> > > From: Stanislav Kinsbursky <skinsbursky@...allels.com>
> > > 
> > > commit 303a7ce92064c285a04c870f2dc0192fdb2968cb upstream.
> > > 
> > > Taking hostname from uts namespace if not safe, because this cuold be
> > > performind during umount operation on child reaper death. And in this case
> > > current->nsproxy is NULL already.
> >  
> > In this case (3.0.y) you haven't included the following change
> > (commit cb7323fffa85 'lockd: create and use per-net NSM RPC clients on
> > MON/UNMON requests') that makes lockd actually use cl_nodename.  I
> > think this patch alone won't fix the bug, as nsm_args::nodename can
> > end up pointing to freed memory.
> > 
> > (I also wonder whether clients should really be per-net or per UTS
> > namespace, and whether those should be orthogonal namespaces at all.)
> 
> Hm, Trond, should I also include the other commit above in the next
> 3.0-stable release?
> 
> Or should this one be dropped?

Hi Greg,

Applying this patch shouldn't be harmful, but since it isn't actually
fixing a problem (there being no net-namespace code in Linux-3.0), I'd
suggest just dropping it.

Thanks!
  Trond

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com