linux-kernel - [PATCH 3.19.y-ckt 132/251] KVM: arm/arm64: vgic: Avoid injecting reserved IRQ numbers

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Message-Id: <1437008972-9140-133-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:07:33 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Andre Przywara <andre.przywara@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 132/251] KVM: arm/arm64: vgic: Avoid injecting reserved IRQ numbers

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Zyngier <marc.zyngier@....com>

commit 4839ddc27b7212ec58874f62c97da7400c8523be upstream.

Commit fd1d0ddf2ae9 (KVM: arm/arm64: check IRQ number on userland
injection) rightly limited the range of interrupts userspace can
inject in a guest, but failed to consider the (unlikely) case where
a guest is configured with 1024 interrupts.

In this case, interrupts ranging from 1020 to 1023 are unuseable,
as they have a special meaning for the GIC CPU interface.

Make sure that these number cannot be used as an IRQ. Also delete
a redundant (and similarily buggy) check in kvm_set_irq.

Reported-by: Peter Maydell <peter.maydell@...aro.org>
Cc: Andre Przywara <andre.przywara@....com>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
[ kamal: backport to 3.19-stable: no change to kvm_set_irq ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 virt/kvm/arm/vgic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 57a16f4..6bc5e2a 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1722,7 +1722,7 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int irq_num,
 			goto out;
 	}
 
-	if (irq_num >= kvm->arch.vgic.nr_irqs)
+	if (irq_num >= min(kvm->arch.vgic.nr_irqs, 1020))
 		return -EINVAL;
 
 	vcpu_id = vgic_update_irq_pending(kvm, cpuid, irq_num, level);
-- 
1.9.1

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