3.19.8-ckt4 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Marc Zyngier <marc.zyng...@arm.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.mayd...@linaro.org>
Cc: Andre Przywara <andre.przyw...@arm.com>
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
[ kamal: backport to 3.19-stable: no change to kvm_set_irq ]
Signed-off-by: Kamal Mostafa <ka...@canonical.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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