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From: Joanna Rutkowska <joanna@invisiblethingslab.com>
To: Ian Campbell <Ian.Campbell@citrix.com>
Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
	Keir Fraser <keir@xen.org>, Jan Beulich <JBeulich@novell.com>
Subject: Re: Xen security advisory CVE-2011-1898 - VT-d	(PCI passthrough) MSI
Date: Fri, 13 May 2011 13:20:45 +0200	[thread overview]
Message-ID: <4DCD140D.9000108@invisiblethingslab.com> (raw)
In-Reply-To: <1305285108.31488.105.camel@zakaz.uk.xensource.com>


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On 05/13/11 13:11, Ian Campbell wrote:
> On Fri, 2011-05-13 at 12:08 +0100, Joanna Rutkowska wrote:
>> On 05/13/11 10:08, Jan Beulich wrote:
> 
>>> Finally, wouldn't killing all guests that potentially could have caused
>>> the problem be a better measure than bringing down the host?
>>>
>>
>> Killing the guest might no longer be enough, because the guest might
>> have already programmed the device to keep sending malicious MSIs.
> 
> Is it even possible to know which guest triggered the MSI, or is the
> best you can do the set of all guests with an MSI capable device passed
> through?
> 

Ah, probably you're right -- if we have more than one driver domain,
then I think LAPIC would not tell us which device genrated the MSI.

In fact it's not really correct to assume that it must have been a guest
with a "MSI capable device" -- note that we don't trigger the MSI via
the official MSI triggering mechanism.

joanna.


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  reply	other threads:[~2011-05-13 11:20 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-12 13:48 Xen security advisory CVE-2011-1898 - VT-d (PCI passthrough) MSI Ian Jackson
2011-05-12 13:49 ` Ian Jackson
2011-05-13  8:08 ` Jan Beulich
2011-05-13 11:08   ` Joanna Rutkowska
2011-05-13 11:11     ` Ian Campbell
2011-05-13 11:20       ` Joanna Rutkowska [this message]
2011-05-13 12:34         ` Jan Beulich
2011-05-13 12:29     ` Jan Beulich
2011-05-13 12:50       ` Tim Deegan
2011-05-13 10:25 ` Ian Campbell
2011-05-16 21:34   ` Cihula, Joseph
2011-05-18  8:53     ` Ian Campbell
2011-05-18 10:03       ` Keir Fraser
2011-05-18 10:06         ` Ian Campbell
2011-05-13 17:32 ` Joanna Rutkowska
2011-05-13 17:35   ` Joanna Rutkowska
2011-05-17  7:42 Jan Beulich
2011-05-17 22:52 ` Cihula, Joseph
2011-05-18  8:54   ` Ian Campbell
2011-05-19 20:48     ` Cihula, Joseph
2011-05-20 10:17       ` Tim Deegan
2011-05-20 16:02         ` Cihula, Joseph
2011-05-22 18:14           ` Tim Deegan
2011-05-23 21:35             ` Cihula, Joseph
2011-05-24  9:03               ` Tim Deegan
2011-05-24 16:56               ` Ian Jackson
2011-05-24 19:23                 ` Cihula, Joseph
2011-05-25 10:46                   ` Alan Cox
2011-05-20 17:19         ` Ian Jackson
2011-05-22 18:15           ` Tim Deegan
2011-05-23  9:02             ` Ian Campbell
2011-05-24 15:15               ` Ian Jackson
2011-05-24 15:57                 ` Keir Fraser
2011-05-24 16:16                   ` Ian Pratt
2011-05-24 17:14                     ` Ian Jackson
2011-05-24 19:35                       ` Cihula, Joseph

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