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

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Date: Mon, 29 Jan 2024 14:30:06 +0800
From: Yunfei Dong <yunfei.dong@...iatek.com>
To: Jeffrey Kardatzke <jkardatzke@...gle.com>,
	Nícolas F . R . A . Prado
	<nfraprado@...labora.com>, Nicolas Dufresne <nicolas.dufresne@...labora.com>,
	Hans Verkuil <hverkuil-cisco@...all.nl>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, Benjamin Gaignard
	<benjamin.gaignard@...labora.com>, Nathan Hebert <nhebert@...omium.org>
CC: Chen-Yu Tsai <wenst@...omium.org>, Yong Wu <yong.wu@...iatek.com>,
	"Hsin-Yi Wang" <hsinyi@...omium.org>, Fritz Koenig <frkoenig@...omium.org>,
	"Daniel Vetter" <daniel@...ll.ch>, Steve Cho <stevecho@...omium.org>, Yunfei
 Dong <yunfei.dong@...iatek.com>, Sumit Semwal <sumit.semwal@...aro.org>,
	"Brian Starkey" <Brian.Starkey@....com>, John Stultz <jstultz@...gle.com>, "T
 . J . Mercier" <tjmercier@...gle.com>, Christian König
	<christian.koenig@....com>, Matthias Brugger <matthias.bgg@...il.com>,
	<dri-devel@...ts.freedesktop.org>, <linaro-mm-sig@...ts.linaro.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH v4,03/22] v4l2: verify restricted dmabufs are used in restricted queue

From: Jeffrey Kardatzke <jkardatzke@...gle.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@...gle.com>
Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.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