[PATCH v6 5/7] vfio/type1: check dma map request is within a valid iova range

[Shameer Kolothum]

This checks and rejects any dma map request outside valid iova
range.

Signed-off-by: Shameer Kolothum 
---
 drivers/vfio/vfio_iommu_type1.c | 22 ++
 1 file changed, 22 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 6fd6841..bf33281 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1091,6 +1091,23 @@ 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 = >iova_list;
+   struct vfio_iova *node;
+
+   list_for_each_entry(node, iova, list) {
+   if ((start >= node->start) && (end <= node->end))
+   return true;
+   }
+
+   return false;
+}
+
 static int vfio_dma_do_map(struct vfio_iommu *iommu,
   struct vfio_iommu_type1_dma_map *map)
 {
@@ -1129,6 +1146,11 @@ 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;
-- 
2.7.4

[PATCH v6 5/7] vfio/type1: check dma map request is within a valid iova range

[Shameer Kolothum]

This checks and rejects any dma map request outside valid iova
range.

Signed-off-by: Shameer Kolothum 
---
 drivers/vfio/vfio_iommu_type1.c | 22 ++
 1 file changed, 22 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 6fd6841..bf33281 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1091,6 +1091,23 @@ 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 = >iova_list;
+   struct vfio_iova *node;
+
+   list_for_each_entry(node, iova, list) {
+   if ((start >= node->start) && (end <= node->end))
+   return true;
+   }
+
+   return false;
+}
+
 static int vfio_dma_do_map(struct vfio_iommu *iommu,
   struct vfio_iommu_type1_dma_map *map)
 {
@@ -1129,6 +1146,11 @@ 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;
-- 
2.7.4