APPLIED: [RESEND] [PATCH 0/2] [CVE-2012-1601] KVM: Ensure all vcpus are consistent with in-kernel irqchip

[Tim Gardner]

On 04/26/2012 10:37 AM, Brad Figg wrote:
> CVE-2012-1601
> 
> BugLink: http://bugs.launchpad.net/bugs/971685
> 
> 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.
> 
> Signed-off-by: Brad Figg <brad.figg at canonical.com>


-- 
Tim Gardner tim.gardner at canonical.com