Re: [PATCH] xen: add gntdev

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Tue, Dec 04, 2012 at 04:26:19PM +0100, Roger Pau Monn? wrote:
> 
> Independently of what we end up doing as default for handling raw file
> disks, could someone review this code?
> 
> It's the first time I've done a device, so someone with more experience
> should review it.

I am not sure I entirely follow what this code's doing, but it seems to
me it may allow arbitrary physical pages to be exposed to userspace
processes in dom0 -- or in a domU, albeit only if dom0 userspace says so.

Is that a correct understanding of one of its effects?  If so, there's
a problem, since not being able to do precisely that is one important
assumption of the 4.4BSD security model.

Thor