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 3.10-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-3.10 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-3.10/mips-kvm-pass-reserved-instruction-exceptions-to-guest.patch
queue-3.10/kvm-ioapic-fix-assignment-of-ioapic-rtc_status.pending_eoi-cve-2014-0155.patch
queue-3.10/virtio-scsi-skip-setting-affinity-on-uninitialized-vq.patch
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