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| author |   Ladi Prosek <lprosek@redhat.com> | 2017-10-05 11:10:22 +0200 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2017-10-10 15:31:18 +0200 |
| commit | fd19d3b45164466a4adce7cbff448ba9189e1427 (patch) | |
| tree | 1ff127f382ee34d24ef4f5a93828f7f8e69cb616 /arch/x86 | |
| parent | Linux 4.14-rc4 (diff) | |
| download | linux-dev-fd19d3b45164466a4adce7cbff448ba9189e1427.tar.xz linux-dev-fd19d3b45164466a4adce7cbff448ba9189e1427.zip | |
KVM: nVMX: update last_nonleaf_level when initializing nested EPT
The function updates context->root_level but didn't call
update_last_nonleaf_level so the previous and potentially wrong value
was used for page walks. For example, a zero value of last_nonleaf_level
would allow a potential out-of-bounds access in arch/x86/mmu/paging_tmpl.h's
walk_addr_generic function (CVE-2017-12188).
Fixes: 155a97a3d7c78b46cef6f1a973c831bc5a4f82bb
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 106d4a029a8a..3c25f20115bc 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4555,6 +4555,7 @@ void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, bool execonly, update_permission_bitmask(vcpu, context, true); update_pkru_bitmask(vcpu, context, true); + update_last_nonleaf_level(vcpu, context); reset_rsvds_bits_mask_ept(vcpu, context, execonly); reset_ept_shadow_zero_bits_mask(vcpu, context, execonly); } |