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CVE-2014-0155 KVM: BUG caused by invalid guest ioapic redirect table (rhbz 1081589 1085016)

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Josh Boyer 2014-04-09 10:28:57 -04:00
parent c4920da303
commit fe4e507de8
2 changed files with 45 additions and 0 deletions
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38
KVM-ioapic-fix-assignment-of-ioapic-rtc_status-pending_eoi.patch Normal file
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@ -0,0 +1,38 @@
Bugzilla: 1085016
Upstream-status: Queued for 3.15
From 5678de3f15010b9022ee45673f33bcfc71d47b60 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 28 Mar 2014 20:41:50 +0100
Subject: KVM: ioapic: fix assignment of ioapic->rtc_status.pending_eoi
(CVE-2014-0155)
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>
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index d4b6015..d98d107 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -356,7 +356,7 @@ static int ioapic_service(struct kvm_ioapic *ioapic, int irq, bool line_status)
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);
--
cgit v0.10.1

7
kernel.spec
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@ -780,6 +780,9 @@ Patch25055: lib-percpu_counter.c-fix-bad-percpu-counter-state-du.patch
#rhbz 1084829
Patch25056: selinux-correctly-label-proc-inodes-in-use-before-th.patch
#CVE-2014-0155 rhbz 1081589 1085016
Patch25057: KVM-ioapic-fix-assignment-of-ioapic-rtc_status-pending_eoi.patch
# END OF PATCH DEFINITIONS
%endif
@ -1516,6 +1519,9 @@ ApplyPatch lib-percpu_counter.c-fix-bad-percpu-counter-state-du.patch
#rhbz 1084829
ApplyPatch selinux-correctly-label-proc-inodes-in-use-before-th.patch
#CVE-2014-0155 rhbz 1081589 1085016
ApplyPatch KVM-ioapic-fix-assignment-of-ioapic-rtc_status-pending_eoi.patch
# END OF PATCH APPLICATIONS
%endif
@ -2328,6 +2334,7 @@ fi
# || ||
%changelog
* Wed Apr 09 2014 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2014-0155 KVM: BUG caused by invalid guest ioapic redirect table (rhbz 1081589 1085016)
- Add patch to fix SELinux lables on /proc files (rhbz 1084829)
- Add patch to fix S3 in KVM guests (rhbz 1074235)