KVM: MMU: avoid creation of unreachable pages in the shadow

It is possible for a shadow page to have a parent link
pointing to a freed page. When zapping a high level table,
kvm_mmu_page_unlink_children fails to remove the parent_pte link.
For that to happen, the child must be unreachable via the shadow
tree, which can happen in shadow_walk_entry if the guest pte was
modified in between walk() and fetch(). Remove the parent pte
reference in such case.

Possible cause for oops in bug #2217430.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 613ec9a..84eee43 100644 (file)
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -331,6 +331,7 @@ static int FNAME(shadow_walk_entry)(struct kvm_shadow_walk *_sw,
                r = kvm_read_guest_atomic(vcpu->kvm, gw->pte_gpa[level - 2],
                                          &curr_pte, sizeof(curr_pte));
                if (r || curr_pte != gw->ptes[level - 2]) {
+                       kvm_mmu_put_page(shadow_page, sptep);
                        kvm_release_pfn_clean(sw->pfn);
                        sw->sptep = NULL;
                        return 1;