diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2015-06-17 14:43:35 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-10 09:49:37 -0700 |
| commit | da75b45af7778af80c7c1d9853868e9bb4b75065 (patch) | |
| tree | ac609ab43e64264a837e9a4f703f697333435449 /virt | |
| parent | aae3d9fecc22c1c7565c94f0818704a1908543ce (diff) | |
KVM: arm/arm64: vgic: Avoid injecting reserved IRQ numbers
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@linaro.org>
Cc: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/vgic.c | 5 |
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 */ |