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authorJim Mattson <jmattson@google.com>2016-07-08 15:36:06 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2016-07-14 19:11:20 +0200
commit2f1fe81123f59271bddda673b60116bde9660385 (patch)
tree8fead675d92c2fbdc180db2231fd47e6ff067984
parent4e59516a12a6ef6dcb660cb3a3f70c64bd60cfec (diff)
downloadlinux-2f1fe81123f59271bddda673b60116bde9660385.tar.bz2
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 <jmattson@google.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/x86/kvm/vmx.c19
-rw-r--r--virt/kvm/kvm_main.c2
2 files changed, 19 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e34965b37a88..5bf203b58f58 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8844,6 +8844,22 @@ static void vmx_load_vmcs01(struct kvm_vcpu *vcpu)
put_cpu();
}
+/*
+ * Ensure that the current vmcs of the logical processor is the
+ * vmcs01 of the vcpu before calling free_nested().
+ */
+static void vmx_free_vcpu_nested(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ int r;
+
+ r = vcpu_load(vcpu);
+ BUG_ON(r);
+ vmx_load_vmcs01(vcpu);
+ free_nested(vmx);
+ vcpu_put(vcpu);
+}
+
static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -8852,8 +8868,7 @@ static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
vmx_destroy_pml_buffer(vmx);
free_vpid(vmx->vpid);
leave_guest_mode(vcpu);
- vmx_load_vmcs01(vcpu);
- free_nested(vmx);
+ vmx_free_vcpu_nested(vcpu);
free_loaded_vmcs(vmx->loaded_vmcs);
kfree(vmx->guest_msrs);
kvm_vcpu_uninit(vcpu);
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)
{