iommu: Validate the PASID in iommu_attach_device_pasid()

[ Upstream commit c404f55c26fc23c70a9f2262f3f36a69fc46289b ]

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: 16603704559c7a68 ("iommu: Add attach/detach_dev_pasid iommu interfaces")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/0-v1-460705442b30+659-iommu_check_pasid_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index cd1210026ac5348b0e3873b5a426a16198b9f25d..ad33161f2374be2475c6116b21f72d724c1fde6b 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -3547,6 +3547,7 @@ 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;
 
@@ -3556,10 +3557,18 @@ 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;