From 2f1fe81123f59271bddda673b60116bde9660385 Mon Sep 17 00:00:00 2001 From: Jim Mattson Date: Fri, 8 Jul 2016 15:36:06 -0700 Subject: KVM: nVMX: Fix memory corruption when using VMCS shadowing When freeing the nested resources of a vcpu, there is an assumption that the vcpu's vmcs01 is the current VMCS on the CPU that executes nested_release_vmcs12(). If this assumption is violated, the vcpu's vmcs01 may be made active on multiple CPUs at the same time, in violation of Intel's specification. Moreover, since the vcpu's vmcs01 is not VMCLEARed on every CPU on which it is active, it can linger in a CPU's VMCS cache after it has been freed and potentially repurposed. Subsequent eviction from the CPU's VMCS cache on a capacity miss can result in memory corruption. It is not sufficient for vmx_free_vcpu() to call vmx_load_vmcs01(). If the vcpu in question was last loaded on a different CPU, it must be migrated to the current CPU before calling vmx_load_vmcs01(). Signed-off-by: Jim Mattson Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini --- virt/kvm/kvm_main.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'virt/kvm') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 48bd520fc702..dd25346ec356 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -148,6 +148,7 @@ int vcpu_load(struct kvm_vcpu *vcpu) put_cpu(); return 0; } +EXPORT_SYMBOL_GPL(vcpu_load); void vcpu_put(struct kvm_vcpu *vcpu) { @@ -157,6 +158,7 @@ void vcpu_put(struct kvm_vcpu *vcpu) preempt_enable(); mutex_unlock(&vcpu->mutex); } +EXPORT_SYMBOL_GPL(vcpu_put); static void ack_flush(void *_completed) { -- cgit v1.2.3