KVM: ioapic: fix assignment of ioapic->rtc_status.pending_eoi (CVE-2014-0155)

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commit 5678de3f15 upstream.

QE reported that they got the BUG_ON in ioapic_service to trigger.
I cannot reproduce it, but there are two reasons why this could happen.

The less likely but also easiest one, is when kvm_irq_delivery_to_apic
does not deliver to any APIC and returns -1.

Because irqe.shorthand == 0, the kvm_for_each_vcpu loop in that
function is never reached.  However, you can target the similar loop in
kvm_irq_delivery_to_apic_fast; just program a zero logical destination
address into the IOAPIC, or an out-of-range physical destination address.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Paolo Bonzini 2014-03-28 20:41:50 +01:00 • committed by Greg Kroah-Hartman

parent 9e66614b8c

commit f8944acc97

1 changed files with 1 additions and 1 deletions

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virt/kvm/ioapic.c

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