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From: "Jan Beulich" <JBeulich@suse.com>
To: George Dunlap <george.dunlap@citrix.com>
Cc: StefanoStabellini <sstabellini@kernel.org>,
	Wei Liu <wei.liu2@citrix.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>,
	David Vrabel <david.vrabel@citrix.com>,
	Anthony Perard <anthony.perard@citrix.com>,
	xen-devel <xen-devel@lists.xenproject.org>,
	dgdegra@tycho.nsa.gov
Subject: Re: Device model operation hypercall (DMOP, re qemu depriv)
Date: Mon, 15 Aug 2016 05:20:39 -0600	[thread overview]
Message-ID: <57B1C1A70200007800105EEB@prv-mh.provo.novell.com> (raw)
In-Reply-To: <0cf7b5a1-2c63-33f5-e1d0-b5144db4867a@citrix.com>

>>> On 15.08.16 at 12:47, <george.dunlap@citrix.com> wrote:
> On 15/08/16 11:19, Jan Beulich wrote:
>> Well, none of the options considered so far are really nice or
>> readily available. I think the easiest to use for both the caller and
>> the implementation of the hypercall would be the auxiliary
>> hypercall for a kernel to indicate user/kernel boundaries plus a
>> flag on the DMOP one for the kernel mode driver to indicate its
>> user mode origin. The main (purely theoretical afaict) downside
>> of this is the difficulty to use it in OSes with variable user/kernel
>> boundaries.
> 
> What about including in the "fixed" part of the hypercall a virtual
> address range that all pointers must be in?  That wouldn't even require
> a user/kernel flag actually; and could conceivably be used by the caller
> (either userspace or kernel space) to thwart certain kinds of potential
> attacks.

That's definitely an option, if we're sufficiently certain that no OSes
will ever require two or more ranges.

Jan


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  reply	other threads:[~2016-08-15 11:20 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-28 17:01 XenProject/XenServer QEMU working group, Friday 8th July, 2016, 15:00 Jennifer Herbert
2016-08-01 11:32 ` Device model operation hypercall (DMOP, re qemu depriv) Ian Jackson
2016-08-01 12:41   ` Jan Beulich
2016-08-02 11:38     ` Wei Liu
2016-08-02 11:58       ` Jan Beulich
2016-08-02 13:02         ` David Vrabel
2016-08-02 13:29           ` Jan Beulich
2016-08-03 10:29       ` Ian Jackson
2016-08-03 12:03         ` Jan Beulich
2016-08-03 13:37           ` Ian Jackson
2016-08-03 14:16             ` Jan Beulich
2016-08-03 14:21               ` George Dunlap
2016-08-03 16:10                 ` Ian Jackson
2016-08-03 16:18                   ` Jan Beulich
2016-08-04 11:21                     ` Ian Jackson
2016-08-04 13:24                       ` Jan Beulich
2016-08-05 16:28                         ` Ian Jackson
2016-08-08 11:18                           ` Jan Beulich
2016-08-08 13:46                             ` Ian Jackson
2016-08-08 14:07                               ` Jan Beulich
2016-08-26 11:38                                 ` Ian Jackson
2016-08-26 12:58                                   ` Jan Beulich
2016-08-26 14:35                                     ` Ian Jackson
2016-08-26 15:13                                       ` Jan Beulich
2016-08-30 11:02                                         ` Ian Jackson
2016-08-30 21:47                                           ` Stefano Stabellini
2016-09-02 14:08                                           ` Wei Liu
2016-08-09 10:29                               ` Jan Beulich
2016-08-09 10:48                                 ` Ian Jackson
2016-08-09 11:30                                   ` Jan Beulich
2016-08-12  9:44                                     ` George Dunlap
2016-08-12 11:50                                       ` Jan Beulich
2016-08-15  9:39                                         ` George Dunlap
2016-08-15 10:19                                           ` Jan Beulich
2016-08-15 10:47                                             ` George Dunlap
2016-08-15 11:20                                               ` Jan Beulich [this message]
2016-08-15 12:07                                                 ` Ian Jackson
2016-08-15 14:20                                                   ` Jan Beulich
2016-08-15 14:57                                                 ` George Dunlap
2016-08-15 15:22                                                   ` Jan Beulich
2016-08-15 14:50                                 ` David Vrabel
2016-08-15 15:24                                   ` Jan Beulich
2016-08-26 11:29                                     ` Ian Jackson
2016-08-26 12:58                                       ` Jan Beulich
2016-08-02 11:37   ` Wei Liu
2016-08-02 11:42     ` George Dunlap
2016-08-02 12:34       ` Wei Liu
2016-09-09 15:16   ` Jennifer Herbert
2016-09-09 15:34     ` David Vrabel
2016-09-12 13:47     ` George Dunlap
2016-09-12 14:32     ` Jan Beulich
2016-09-13 10:37       ` George Dunlap
2016-09-13 11:53         ` Jan Beulich
2016-09-13 16:07       ` David Vrabel
2016-09-14  9:51         ` Jan Beulich
2016-09-21 11:21           ` Ian Jackson
2016-09-21 11:28             ` George Dunlap
2016-09-21 11:58               ` Jan Beulich
2016-09-21 11:55             ` Jan Beulich
2016-09-21 12:23               ` Device model operation hypercall (DMOP, re qemu depriv) [and 1 more messages] Ian Jackson
2016-09-21 12:48                 ` Jan Beulich
2016-09-21 13:24                   ` Ian Jackson
2016-09-21 13:56                     ` Jan Beulich
2016-09-21 15:06                       ` Ian Jackson
2016-09-21 17:09                       ` George Dunlap
2016-09-22  8:47                         ` Jan Beulich
2016-09-09 16:18 ` XenProject/XenServer QEMU working group minutes, 30th August 2016 Jennifer Herbert
2016-09-12  7:16   ` Juergen Gross
2016-10-14 18:01   ` QEMU XenServer/XenProject Working group meeting 29th September 2016 Jennifer Herbert
2016-10-18 19:54     ` Stefano Stabellini
2016-10-20 17:37       ` Lars Kurth
2016-10-20 18:53         ` Stefano Stabellini
2017-02-28 18:18     ` QEMU XenServer/XenProject Working group meeting 10th February 2017 Jennifer Herbert
2017-06-05 13:48       ` QEMU XenServer/XenProject Working group meeting 10th May 2017 Jennifer Herbert

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