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Re: [Xen-devel] [PATCH] fix x86_64 ia32 userspace support

from [Keir Fraser] [Permanent Link][Original]
To: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] fix x86_64 ia32 userspace support
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Tue, 7 Feb 2006 15:01:10 +0000
Cc: Chris Wright <chrisw@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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On 7 Feb 2006, at 14:22, Jan Beulich wrote:
Even with this fixed in the guest kernel I'd consider this a security hole if so, since executing a sysenter instruction in 32-bit user mode would then be a way to bring the whole system down. Jan 

The hole turns out to be dom0 only. I've now checked in a fix.

Christian will check in Chris's int80 fix shortly.

 -- Keir


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