KVM: Ensure all vcpus are consistent with in-kernel irqchip settings

Bugdb: 13871
This fixes: CVE-2012-1601
Commit 3e515705a1f46beb1c942bb8043c16f8ac7b1e9e upstream.
If some vcpus are created before KVM_CREATE_IRQCHIP, then
irqchip_in_kernel() and vcpu->arch.apic will be inconsistent, leading
to potential NULL pointer dereferences.

Fix by:
- ensuring that no vcpus are installed when KVM_CREATE_IRQCHIP is called
- ensuring that a vcpu has an apic if it is installed after KVM_CREATE_IRQCHIP

This is somewhat long winded because vcpu->arch.apic is created without
kvm->lock held.

Based on earlier patch by Michael Ellerman.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 8213efe1998c16eade6966acd1cf1b5b22d489a8..a874213fbc96ebb53275934bcd6cff2d7081f170 100644 (file)
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1168,6 +1168,11 @@ out:
 
 #define PALE_RESET_ENTRY    0x80000000ffffffb0UL
 
+bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
+{
+       return irqchip_in_kernel(vcpu->kcm) == (vcpu->arch.apic != NULL);
+}
+
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
        struct kvm_vcpu *v;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 77c9d8673dc40430a2d5cd609ad0d30dee105621..fe54ebb64fe876ee84b0de787c627531f7afc648 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3410,6 +3410,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
                r = -EEXIST;
                if (kvm->arch.vpic)
                        goto create_irqchip_unlock;
+               r = -EINVAL;
+               if (atomic_read(&kvm->online_vcpus))
+                       goto create_irqchip_unlock;
                r = -ENOMEM;
                vpic = kvm_create_pic(kvm);
                if (vpic) {
@@ -6171,6 +6174,11 @@ void kvm_arch_check_processor_compat(void *rtn)
        kvm_x86_ops->check_processor_compatibility(rtn);
 }
 
+bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
+{
+       return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);
+}
+
 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 {
        struct page *page;

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 31ebb59cbd2f848e05c0b98b70caa6217085a9f2..d70a250701eef23dc6258d2338a54c6bc0f6d9b0 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -730,6 +730,13 @@ static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
 {
        return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
 }
+
+bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
+
+#else
+
+static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
+
 #endif
 
 #ifdef __KVM_HAVE_DEVICE_ASSIGNMENT

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 96ebc0679415baeff88d7764b1c0e956820adad2..957052de8d21e5d88145b901d04d1a8b03b227fe 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1618,6 +1618,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
                return r;
 
        mutex_lock(&kvm->lock);
+       if (!kvm_vcpu_compatible(vcpu)) {
+               r = -EINVAL;
+               goto vcpu_destroy;
+       }
        if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
                r = -EINVAL;
                goto vcpu_destroy;