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| author | Avi Kivity <avi@redhat.com> | 2012-03-05 14:23:29 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2012-05-31 00:43:10 +0100 |
| commit | 645b177cbfce6b695bdbe0b4c131de584821840d (patch) | |
| tree | 7320d673f3a10cf732fd19bce58c5727060ad5a4 /virt | |
| parent | 51155201f92e585d40d8921893a508e8b99b2d0e (diff) | |
| download | lwn-645b177cbfce6b695bdbe0b4c131de584821840d.tar.gz lwn-645b177cbfce6b695bdbe0b4c131de584821840d.zip | |
KVM: Ensure all vcpus are consistent with in-kernel irqchip settings
(cherry picked from commit 3e515705a1f46beb1c942bb8043c16f8ac7b1e9e)
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 9ffac2e0d16f..ec747dc48e58 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1667,6 +1667,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) goto vcpu_destroy; mutex_lock(&kvm->lock); + if (!kvm_vcpu_compatible(vcpu)) { + r = -EINVAL; + goto unlock_vcpu_destroy; + } if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { r = -EINVAL; goto unlock_vcpu_destroy; |