iommu: Validate the PASID in iommu_attach_device_pasid()

The SVA code checks that the PASID is valid for the device when assigning
the PASID to the MM, but the normal PAGING related path does not check it.

Devices that don't support PASID or PASID values too large for the device
should not invoke the driver callback. The drivers should rely on the
core code for this enforcement.

Fixes: 1660370 ("iommu: Add attach/detach_dev_pasid iommu interfaces")
Signed-off-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Yi Liu <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: jgunthorpe

drivers/iommu/iommu.c

@@ -3354,6 +3354,7 @@ int iommu_attach_device_pasid(struct iommu_domain *domain,
 {
 	/* Caller must be a probed driver on dev */
 	struct iommu_group *group = dev->iommu_group;
+	struct group_device *device;
 	void *curr;
 	int ret;
 
@@ -3363,10 +3364,18 @@ int iommu_attach_device_pasid(struct iommu_domain *domain,
 	if (!group)
 		return -ENODEV;
 
-	if (!dev_has_iommu(dev) || dev_iommu_ops(dev) != domain->owner)
+	if (!dev_has_iommu(dev) || dev_iommu_ops(dev) != domain->owner ||
+	    pasid == IOMMU_NO_PASID)
 		return -EINVAL;
 
 	mutex_lock(&group->mutex);
+	for_each_group_device(group, device) {
+		if (pasid >= device->dev->iommu->max_pasids) {
+			ret = -EINVAL;
+			goto out_unlock;
+		}
+	}
+
 	curr = xa_cmpxchg(&group->pasid_array, pasid, NULL, domain, GFP_KERNEL);
 	if (curr) {
 		ret = xa_err(curr) ? : -EBUSY;