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media: videobuf2: Assert held reservation lock for dma-buf mmapping

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When userspace mmaps dma-buf's fd, the dma-buf reservation lock must be
held. Add locking sanity checks to the dma-buf mmaping callbacks to ensure
that the locking assumptions won't regress in the future.

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Acked-by: Tomasz Figa <tfiga@chromium.org>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221110201349.351294-6-dmitry.osipenko@collabora.com
This commit is contained in:
Dmitry Osipenko 2022-11-10 23:13:48 +03:00
parent 27f3733a10
commit 3a6ca1810f
3 changed files with 9 additions and 0 deletions
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3
drivers/media/common/videobuf2/videobuf2-dma-contig.c
View file

@ -11,6 +11,7 @@
*/
#include <linux/dma-buf.h>
#include <linux/dma-resv.h>
#include <linux/module.h>
#include <linux/refcount.h>
#include <linux/scatterlist.h>
@ -455,6 +456,8 @@ static int vb2_dc_dmabuf_ops_vmap(struct dma_buf *dbuf, struct iosys_map *map)
static int vb2_dc_dmabuf_ops_mmap(struct dma_buf *dbuf,
struct vm_area_struct *vma)
{
dma_resv_assert_held(dbuf->resv);
return vb2_dc_mmap(dbuf->priv, vma);
}

3
drivers/media/common/videobuf2/videobuf2-dma-sg.c
View file

@ -10,6 +10,7 @@
* the Free Software Foundation.
*/
#include <linux/dma-resv.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/refcount.h>
@ -495,6 +496,8 @@ static int vb2_dma_sg_dmabuf_ops_vmap(struct dma_buf *dbuf,
static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf,
struct vm_area_struct *vma)
{
dma_resv_assert_held(dbuf->resv);
return vb2_dma_sg_mmap(dbuf->priv, vma);
}

3
drivers/media/common/videobuf2/videobuf2-vmalloc.c
View file

@ -10,6 +10,7 @@
* the Free Software Foundation.
*/
#include <linux/dma-resv.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mm.h>
@ -316,6 +317,8 @@ static int vb2_vmalloc_dmabuf_ops_vmap(struct dma_buf *dbuf,
static int vb2_vmalloc_dmabuf_ops_mmap(struct dma_buf *dbuf,
struct vm_area_struct *vma)
{
dma_resv_assert_held(dbuf->resv);
return vb2_vmalloc_mmap(dbuf->priv, vma);
}