From 4839ddc27b7212ec58874f62c97da7400c8523be Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Wed, 17 Jun 2015 14:43:35 +0100 Subject: [PATCH] KVM: arm/arm64: vgic: Avoid injecting reserved IRQ numbers 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 Cc: Andre Przywara Cc: # 4.1, 4.0, 3.19, 3.18 Signed-off-by: Marc Zyngier --- virt/kvm/arm/vgic.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index 78fb8201014f..950064a0942d 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -1561,7 +1561,7 @@ 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); @@ -2161,10 +2161,7 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, 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 */