[PATCH 1/2] KVM: arm64: vgic: check redist region is not above the VM IPA size

[Ricardo Koller <ricarkol@google.com>]

Extend vgic_v3_check_base() to verify that the redistributor regions
don't go above the VM-specified IPA size (phys_size). This can happen
when using the legacy KVM_VGIC_V3_ADDR_TYPE_REDIST attribute with:

  base + size > phys_size AND base < phys_size

vgic_v3_check_base() is used to check the redist regions bases when
setting them (with the vcpus added so far) and when attempting the first
vcpu-run.

Signed-off-by: Ricardo Koller <ricarkol@google.com>
---
 arch/arm64/kvm/vgic/vgic-v3.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c
index 66004f61cd83..5afd9f6f68f6 100644
--- a/arch/arm64/kvm/vgic/vgic-v3.c
+++ b/arch/arm64/kvm/vgic/vgic-v3.c
@@ -512,6 +512,10 @@ bool vgic_v3_check_base(struct kvm *kvm)
 		if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) <
 			rdreg->base)
 			return false;
+
+		if (rdreg->base + vgic_v3_rd_region_size(kvm, rdreg) >
+			kvm_phys_size(kvm))
+			return false;
 	}
 
 	if (IS_VGIC_ADDR_UNDEF(d->vgic_dist_base))
-- 
2.33.0.153.gba50c8fa24-goog