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Re: [Xen-devel] domU crashing Xen

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] domU crashing Xen
From: Chris Wright <chrisw@xxxxxxxxxxxx>
Date: Thu, 12 Oct 2006 09:10:59 -0700
Cc: Chris Wright <chrisw@xxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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* Keir Fraser (Keir.Fraser@xxxxxxxxxxxx) wrote:
> On 12/10/06 07:26, "Chris Wright" <chrisw@xxxxxxxxxxxx> wrote:
> 
> > Haven't worked out exactly what's causing the bug, but in testing the
> > pv_ops tree against current Xen (11736:f7d65fb7299b) I can reliably
> > crash Xen with the following trace, caused by:
> > 
> > arch/x86/traps.c::handle_gdt_ldt_mapping_fault()
> >     ...
> >     /* Should never fault in another vcpu's area. */
> >     BUG_ON(vcpu_area != current->vcpu_id);
> 
> The shadow-refcount code is quite fresh. We should confirm this isn't
> exploitable by ordinary PV guests though.

Indeed, I'll dig at this a little more.

thanks,
-chris

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