linux-kernel - Re: call_usermodehelper in containers

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Message-ID: <20131112004703.GB15377@kroah.com>
Date:	Mon, 11 Nov 2013 16:47:03 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-nfs@...r.kernel.org,
	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	devel@...nvz.org, ebiederm@...ssion.com, oleg@...hat.com,
	bfields@...ldses.org, bharrosh@...asas.com
Subject: Re: call_usermodehelper in containers

On Mon, Nov 11, 2013 at 07:18:25AM -0500, Jeff Layton wrote:
> We have a bit of a problem wrt to upcalls that use call_usermodehelper
> with containers and I'd like to bring this to some sort of resolution...
> 
> A particularly problematic case (though there are others) is the
> nfsdcltrack upcall. It basically uses call_usermodehelper to run a
> program in userland to track some information on stable storage for
> nfsd.

I thought the discussion at the kernel summit about this issue was:
	- don't do this.
	- don't do it.
	- if you really need to do this, fix nfsd

thanks,

greg k-h
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