KVM: nVMX: unconditionally cancel preemption timer in free_nested (CVE-2019-7221)

commit ecec76885bcfe3294685dc363fd1273df0d5d65f upstream.

Bugzilla: 1671904

There are multiple code paths where an hrtimer may have been started to
emulate an L1 VMX preemption timer that can result in a call to free_nested
without an intervening L2 exit where the hrtimer is normally
cancelled. Unconditionally cancel in free_nested to cover all cases.

Embargoed until Feb 7th 2019.

Signed-off-by: Peter Shier <pshier@google.com>
Reported-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reported-by: Felix Wilhelm <fwilhelm@google.com>
Cc: stable@kernel.org
Message-Id: <20181011184646.154065-1-pshier@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 39a0e34..8ed1cfc 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8469,6 +8469,7 @@ static void free_nested(struct vcpu_vmx *vmx)
        if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon)
                return;
 
+       hrtimer_cancel(&vmx->nested.preemption_timer);
        vmx->nested.vmxon = false;
        vmx->nested.smm.vmxon = false;
        free_vpid(vmx->nested.vpid02);