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KVM: arm64: vgic-v3: Sanitise guest writes to GICR_INVLPIR

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Make sure we filter out non-LPI invalidation when handling writes
to GICR_INVLPIR.

Fixes: 4645d11f4a ("KVM: arm64: vgic-v3: Implement MMIO-based LPI invalidation")
Reported-by: Alexander Potapenko <glider@google.com>
Tested-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20241117165757.247686-2-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier 2024-11-17 16:57:54 +00:00 • committed by Oliver Upton
parent 60ad25e14a
commit d561491ba9
1 changed files with 6 additions and 1 deletions
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7
arch/arm64/kvm/vgic/vgic-mmio-v3.c
View file

@ -530,6 +530,7 @@ static void vgic_mmio_write_invlpi(struct kvm_vcpu *vcpu,
unsigned long val)
{
struct vgic_irq *irq;
u32 intid;
/*
* If the guest wrote only to the upper 32bit part of the
@ -541,9 +542,13 @@ static void vgic_mmio_write_invlpi(struct kvm_vcpu *vcpu,
if ((addr & 4) || !vgic_lpis_enabled(vcpu))
return;
intid = lower_32_bits(val);
if (intid < VGIC_MIN_LPI)
return;
vgic_set_rdist_busy(vcpu, true);
irq = vgic_get_irq(vcpu->kvm, NULL, lower_32_bits(val));
irq = vgic_get_irq(vcpu->kvm, NULL, intid);
if (irq) {
vgic_its_inv_lpi(vcpu->kvm, irq);
vgic_put_irq(vcpu->kvm, irq);