diff options
| author | Marcelo Tosatti <mtosatti@redhat.com> | 2008-11-25 15:33:10 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2008-11-26 12:34:27 +0200 |
| commit | 6c475352e87224a8f0b8cc6f6cc96b30563dc5b4 (patch) | |
| tree | 1046e74c244c3db4673fb937af8b56875405114c /arch/x86/kvm/mmu.c | |
| parent | c30f8a6c6d74f67bc2107726cc61a1e7c71e9740 (diff) | |
| download | linux-6c475352e87224a8f0b8cc6f6cc96b30563dc5b4.tar.bz2 | |
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>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
0 files changed, 0 insertions, 0 deletions