The kvm_iommu_map_pages function in virt/kvm/iommu.c in the Linux
kernel through 3.16.1 miscalculates the number of pages during the
handling of a mapping failure, which allows guest OS users to (1)
cause a denial of service (host OS memory corruption) or possibly have
unspecified other impact by triggering a large gfn value or (2) cause
a denial of service (host OS memory consumption) by triggering a small
gfn value that leads to permanently pinned pages.
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