Re: [Xen-devel] QEMU bumping memory bug analysis

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 08/06/15 14:38, Stefano Stabellini wrote:
>> Also device-mode/$domid/state is writable by QEMU so we can't trust
>> > the content as indicator either.
> We can because the write happens before we unpause the guest

Only when creating the domain fresh.  On resume, the guest has possibly
had the chance to code-inject via the qemu save format.  There are many
CVEs in this area, and I am not willing to be all of them are fixed.

In XenServer, even loading VM state from the save file happens in the
deprivilelged environment.

~Andrew

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