Re: [PATCH v3,03/21] v4l2: verify secure dmabufs are used in secure queue

[Hans Verkuil <hverkuil-cisco@xs4all.nl>]

On 06/12/2023 09:15, Yunfei Dong wrote:
> From: Jeffrey Kardatzke <jkardatzke@google.com>
> 
> Verfies in the dmabuf implementations that if the secure memory flag is

Verfies -> Verifies

> set for a queue that the dmabuf submitted to the queue is unmappable.
> 
> Signed-off-by: Jeffrey Kardatzke <jkardatzke@google.com>
> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> ---
>  drivers/media/common/videobuf2/videobuf2-dma-contig.c | 6 ++++++
>  drivers/media/common/videobuf2/videobuf2-dma-sg.c     | 6 ++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/media/common/videobuf2/videobuf2-dma-contig.c b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
> index 3d4fd4ef5310..ad58ef8dc231 100644
> --- a/drivers/media/common/videobuf2/videobuf2-dma-contig.c
> +++ b/drivers/media/common/videobuf2/videobuf2-dma-contig.c
> @@ -710,6 +710,12 @@ static int vb2_dc_map_dmabuf(void *mem_priv)
>  		return -EINVAL;
>  	}
>  
> +	/* verify the dmabuf is secure if we are in secure mode */
> +	if (buf->vb->vb2_queue->secure_mem && sg_page(sgt->sgl)) {

This needs a bit more explanation. I guess that for secure memory
sg_page returns NULL?

> +		pr_err("secure queue requires secure 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 28f3fdfe23a2..55428c73c380 100644
> --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c
> @@ -564,6 +564,12 @@ static int vb2_dma_sg_map_dmabuf(void *mem_priv)
>  		return -EINVAL;
>  	}
>  
> +	/* verify the dmabuf is secure if we are in secure mode */
> +	if (buf->vb->vb2_queue->secure_mem && !sg_dma_secure(sgt->sgl)) {

I can't find the sg_dma_secure function. I suspect this patch series
depends on another series?

> +		pr_err("secure queue requires secure dma_buf");
> +		return -EINVAL;
> +	}
> +
>  	buf->dma_sgt = sgt;
>  	buf->vaddr = NULL;
>  

Regards,

	Hans