Hi Shameer,
On 6/26/19 5:12 PM, Shameer Kolothum wrote:
> This checks and rejects any dma map request outside valid iova
> range.
>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@xxxxxxxxxx>
> ---
> v6 --> v7
>
> Addressed the case where a container with only an mdev device will
> have an empty list(Suggested by Alex).
> ---
> drivers/vfio/vfio_iommu_type1.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index e872fb3a0f39..89ad0da7152c 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -1050,6 +1050,27 @@ static int vfio_pin_map_dma(struct vfio_iommu *iommu, struct vfio_dma *dma,
> return ret;
> }
>
> +/*
> + * Check dma map request is within a valid iova range
> + */
> +static bool vfio_iommu_iova_dma_valid(struct vfio_iommu *iommu,
> + dma_addr_t start, dma_addr_t end)
> +{
> + struct list_head *iova = &iommu->iova_list;
> + struct vfio_iova *node;
> +
> + list_for_each_entry(node, iova, list) {
> + if (start >= node->start && end <= node->end)
> + return true;
> + }
> +
> + /*
> + * Check for list_empty() as well since a container with
> + * only an mdev device will have an empty list.
> + */
> + return list_empty(&iommu->iova_list);
iova
Besides
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>
Thanks
Eric
> +}
> +
> static int vfio_dma_do_map(struct vfio_iommu *iommu,
> struct vfio_iommu_type1_dma_map *map)
> {
> @@ -1093,6 +1114,11 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu,
> goto out_unlock;
> }
>
> + if (!vfio_iommu_iova_dma_valid(iommu, iova, iova + size - 1)) {
> + ret = -EINVAL;
> + goto out_unlock;
> + }
> +
> dma = kzalloc(sizeof(*dma), GFP_KERNEL);
> if (!dma) {
> ret = -ENOMEM;
>
