[PATCH v4, 03/22] v4l2: verify restricted dmabufs are used in restricted queue

[Yunfei Dong]

From: Jeffrey Kardatzke <jkardatzke at google.com>

Verfies in the dmabuf implementations that if the restricted memory
flag is set for a queue that the dmabuf submitted to the queue is
unmappable.

Signed-off-by: Jeffrey Kardatzke <jkardatzke at google.com>
Signed-off-by: Yunfei Dong <yunfei.dong at mediatek.com>
---
 drivers/media/common/videobuf2/videobuf2-dma-contig.c | 8 ++++++++
 drivers/media/common/videobuf2/videobuf2-dma-sg.c     | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
index 3d4fd4ef5310..f953570fef27 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
@@ -710,6 +710,14 @@ static int vb2_dc_map_dmabuf(void *mem_priv)
 		return -EINVAL;
 	}
 
+	/* Verify the dmabuf is restricted if we are in restricted mode, this is done
+	 * by validating there is no page entry for the dmabuf.
+	 */
+	if (buf->vb->vb2_queue->restricted_mem && sg_page(sgt->sgl)) {
+		pr_err("restricted queue requires restricted dma_buf");
+		return -EINVAL;
+	}
+
 	/* checking if dmabuf is big enough to store contiguous chunk */
 	contig_size = vb2_dc_get_contiguous_size(sgt);
 	if (contig_size < buf->size) {
diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
index 6975a71d740f..f87bd3f40b9b 100644
--- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
+++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
@@ -570,6 +570,14 @@ static int vb2_dma_sg_map_dmabuf(void *mem_priv)
 		return -EINVAL;
 	}
 
+	/* Verify the dmabuf is restricted if we are in restricted mode, this is done
+	 * by validating there is no page entry for the dmabuf.
+	 */
+	if (buf->vb->vb2_queue->restricted_mem && !sg_page(sgt->sgl)) {
+		pr_err("restricted queue requires restricted dma_buf");
+		return -EINVAL;
+	}
+
 	buf->dma_sgt = sgt;
 	buf->vaddr = NULL;
 
-- 
2.18.0