Patch "KVM: ioapic: fix assignment of ioapic->rtc_status.pending_eoi (CVE-2014-0155)" has been added to the 3.14-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-ioapic-fix-assignment-of-ioapic-rtc_status.pending_eoi-cve-2014-0155.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 5678de3f15010b9022ee45673f33bcfc71d47b60 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Fri, 28 Mar 2014 20:41:50 +0100
Subject: KVM: ioapic: fix assignment of ioapic->rtc_status.pending_eoi (CVE-2014-0155)

From: Paolo Bonzini <pbonzini@xxxxxxxxxx>

commit 5678de3f15010b9022ee45673f33bcfc71d47b60 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@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 virt/kvm/ioapic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -306,7 +306,7 @@ static int ioapic_deliver(struct kvm_ioa
 		BUG_ON(ioapic->rtc_status.pending_eoi != 0);
 		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe,
 				ioapic->rtc_status.dest_map);
-		ioapic->rtc_status.pending_eoi = ret;
+		ioapic->rtc_status.pending_eoi = (ret < 0 ? 0 : ret);
 	} else
 		ret = kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe, NULL);
 


Patches currently in stable-queue which might be from pbonzini@xxxxxxxxxx are

queue-3.14/kvm-async_pf-mm-mm_users-can-not-pin-apf-mm.patch
queue-3.14/mips-kvm-pass-reserved-instruction-exceptions-to-guest.patch
queue-3.14/kvm-ioapic-fix-assignment-of-ioapic-rtc_status.pending_eoi-cve-2014-0155.patch
queue-3.14/virtio-scsi-skip-setting-affinity-on-uninitialized-vq.patch
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