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Re: [Xen-ia64-devel] RE: PATCH: merge iva

from [Tristan Gingold]

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To:	"Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>, <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>, "Williamson, Alex (Linux Kernel Dev)" <alex.williamson@xxxxxx>
Subject:	Re: [Xen-ia64-devel] RE: PATCH: merge iva
From:	Tristan Gingold <Tristan.Gingold@xxxxxxxx>
Date:	Thu, 15 Jun 2006 09:41:18 +0200
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Le Mercredi 14 Juin 2006 18:48, Magenheimer, Dan (HP Labs Fort Collins) a 
écrit :
[...]
> I wasn't fighting the specific patch as much as providing
> history.  The possibility of vcr.iva being used maliciously
> is very small but vBlades evolved from a security-focused
> project so validating all privileged registers to eliminate
> security holes was an early vBlades objective. 
Thank you for the historical view.

> To contrive
> an example, if an attacker could somehow change vcr.iva,
> he might be able to cause arbitrary user code to be executed
> at PL2.
I still don't understand this example: privregs are only accessible at PL2.
So the attacker has to be in PL2.  This seems to be moot.

Tristan.

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