[Xen-devel] Re: DOMID_XEN and iomem_access_permitted

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

Keir Fraser wrote:
> Unprivileged domains will be unable to obtain a reference to dom_xen. So
> this bug can only trigger from dom0.
>   
OK -- and DOMID_IO redirects the checks back to current->domain before 
calling iomem_access_permitted() in get_page_from_l1e().  So we don't 
believe a domU should be able to pass a "dummy domain" to 
iomem_access_permitted().  Good to know. :-)
-George

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