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There's currently no verification for host issued ranges in most of the pKVM memory transitions. The end boundary might therefore be subject to overflow and later checks could be evaded. Close this loophole with an additional pfn_range_is_valid() check on a per public function basis. Once this check has passed, it is safe to convert pfn and nr_pages into a phys_addr_t and a size. host_unshare_guest transition is already protected via __check_host_shared_guest(), while assert_host_shared_guest() callers are already ignoring host checks. Signed-off-by: Vincent Donnefort <vdonnefort@google.com> Link: https://patch.msgid.link/20251016164541.3771235-1-vdonnefort@google.com Signed-off-by: Marc Zyngier <maz@kernel.org>