[PATCH 4.1 49/56] KVM: arm/arm64: vgic: Avoid injecting reserved IRQ numbers

From: Greg Kroah-Hartman
Date: Wed Jul 08 2015 - 03:38:03 EST


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

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

From: Marc Zyngier <marc.zyngier@xxxxxxx>

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@xxxxxxxxxx>
Cc: Andre Przywara <andre.przywara@xxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
virt/kvm/arm/vgic.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1561,7 +1561,7 @@ int kvm_vgic_inject_irq(struct kvm *kvm,
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);
@@ -2161,10 +2161,7 @@ int kvm_set_irq(struct kvm *kvm, int irq

BUG_ON(!vgic_initialized(kvm));

- if (spi > kvm->arch.vgic.nr_irqs)
- return -EINVAL;
return kvm_vgic_inject_irq(kvm, 0, spi, level);
-
}

/* MSI not implemented yet */


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