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authorMarc Zyngier <marc.zyngier@arm.com>2015-06-17 16:43:35 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2015-06-17 17:18:59 +0300
commit4839ddc27b7212ec58874f62c97da7400c8523be (patch)
tree5278f3b4580f010ed2ca9692cefd25d1ab591123 /virt/kvm/arm
parent4642019dc4457486223e1fb75a6a4cba6e0e903a (diff)
downloadlinux-4839ddc27b7212ec58874f62c97da7400c8523be.tar.xz
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 <peter.maydell@linaro.org> Cc: Andre Przywara <andre.przywara@arm.com> Cc: <stable@vger.kernel.org> # 4.1, 4.0, 3.19, 3.18 Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt/kvm/arm')
-rw-r--r--virt/kvm/arm/vgic.c5
1 files changed, 1 insertions, 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 */