linux-kernel - Re: [PATCH 1/1] Drivers: hv: Implement the file copy service

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Message-ID: <20140109201436.GA16425@kroah.com>
Date:	Thu, 9 Jan 2014 12:14:36 -0800
From:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	KY Srinivasan <kys@...rosoft.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: Re: [PATCH 1/1] Drivers: hv: Implement the file copy service

On Thu, Jan 09, 2014 at 11:09:21PM +0300, Dan Carpenter wrote:
> We've had this discussion before where you urge me to trust the host...
> 
>  Problem: This code is racy.
> Solution: The host will only send one message at a time.
> 
> Now I have to audit the user space code on the host and I don't feel
> like doing that so you win.
> 
> I wish we had a better way to do IPC.  If kdbus were ready, that might
> have worked for this, and it's a better solution because both sender and
> reciever code will be written in a less trusting way.

kdbus is almost ready, it might make 3.15, depending on the result of
work that is happening at linux.conf.au and FOSDEM.

If it would be a better solution for this, that's even more reason to
get kdbus merged soon, no need to add something that doesn't really
work.

But, how will kdbus help with this?  It's a userspace <-> userspace
message transmission bus, would you want the kernel to be a receiver or
sender here?

thanks,

greg k-h
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