From: Keir Fraser <keir.fraser@eu.citrix.com>
To: George Dunlap <George.Dunlap@eu.citrix.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: DOMID_XEN and iomem_access_permitted
Date: Wed, 12 May 2010 21:48:17 +0100 [thread overview]
Message-ID: <C810D2A1.1CAF%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <AANLkTinh4T3vDyES59tf_S6xxh8yr2irLArzoUNvO374@mail.gmail.com>
On 12/05/2010 21:45, "George Dunlap" <George.Dunlap@eu.citrix.com> wrote:
> Actually, setting up an empty rangeset for the "xen" domain might be
> the best solution... it works no matter what the answers above are,
> and has fewer special cases in the code. Looks like it would mainly
> involve actually initializing the rangeset code even for dummy domains
> in domian_create().
Yes, I'll patch it this way, thanks.
> Second question: Is it possible for a domU to crash the host with this
> bug? It looks like set_foreigndom() will only allow you to use
> DOMID_XEN from domain 0. If the answer to question 1 above is "yes",
> then I think we can safely say domU can't exploit this bug to cause a
> denial-of-service attack.
Unprivileged domains will be unable to obtain a reference to dom_xen. So
this bug can only trigger from dom0.
-- Keir
next prev parent reply other threads:[~2010-05-12 20:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-12 20:45 DOMID_XEN and iomem_access_permitted George Dunlap
2010-05-12 20:48 ` Keir Fraser [this message]
2010-05-12 20:55 ` George Dunlap
2010-05-13 9:09 ` Keir Fraser
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