* [PATCH 1/4] KVM: arm64: vgic-v3: Sanitise guest writes to GICR_INVLPIR
[not found] <20241117165757.247686-1-maz@kernel.org>
@ 2024-11-17 16:57 ` Marc Zyngier
0 siblings, 0 replies; only message in thread
From: Marc Zyngier @ 2024-11-17 16:57 UTC (permalink / raw)
To: kvmarm, linux-arm-kernel
Cc: Joey Gouly, Suzuki K Poulose, Oliver Upton, Zenghui Yu,
Alexander Potapenko, stable
Make sure we filter out non-LPI invalidation when handling writes
to GICR_INVLPIR.
Fixes: 4645d11f4a553 ("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
---
arch/arm64/kvm/vgic/vgic-mmio-v3.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
index 9e50928f5d7df..70a44852cbafe 100644
--- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c
+++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
@@ -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);
--
2.39.2
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