Commit a5bff92e authored by Daniel Vetter's avatar Daniel Vetter Committed by Sumit Semwal

dma-buf: Fix SET_NAME ioctl uapi

The uapi is the same on 32 and 64 bit, but the number isn't. Everyone
who botched this please re-read:

https://www.kernel.org/doc/html/v5.4-preprc-cpu/ioctl/botching-up-ioctls.html

Also, the type argument for the ioctl macros is for the type the void
__user *arg pointer points at, which in this case would be the
variable-sized char[] of a 0 terminated string. So this was botched in
more than just the usual ways.

Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Chenbo Feng <fengc@google.com>
Cc: Greg Hackmann <ghackmann@google.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Cc: minchan@kernel.org
Cc: surenb@google.com
Cc: jenhaochen@google.com
Cc: Martin Liu <liumartin@google.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
Tested-by: default avatarMartin Liu <liumartin@google.com>
Reviewed-by: default avatarMartin Liu <liumartin@google.com>
Signed-off-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
  [sumits: updated some checkpatch fixes, corrected author email]
Link: https://patchwork.freedesktop.org/patch/msgid/20200407133002.3486387-1-daniel.vetter@ffwll.ch
parent 6292b8ef
...@@ -388,7 +388,8 @@ static long dma_buf_ioctl(struct file *file, ...@@ -388,7 +388,8 @@ static long dma_buf_ioctl(struct file *file,
return ret; return ret;
case DMA_BUF_SET_NAME: case DMA_BUF_SET_NAME_A:
case DMA_BUF_SET_NAME_B:
return dma_buf_set_name(dmabuf, (const char __user *)arg); return dma_buf_set_name(dmabuf, (const char __user *)arg);
default: default:
......
...@@ -39,6 +39,12 @@ struct dma_buf_sync { ...@@ -39,6 +39,12 @@ struct dma_buf_sync {
#define DMA_BUF_BASE 'b' #define DMA_BUF_BASE 'b'
#define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync) #define DMA_BUF_IOCTL_SYNC _IOW(DMA_BUF_BASE, 0, struct dma_buf_sync)
/* 32/64bitness of this uapi was botched in android, there's no difference
* between them in actual uapi, they're just different numbers.
*/
#define DMA_BUF_SET_NAME _IOW(DMA_BUF_BASE, 1, const char *) #define DMA_BUF_SET_NAME _IOW(DMA_BUF_BASE, 1, const char *)
#define DMA_BUF_SET_NAME_A _IOW(DMA_BUF_BASE, 1, u32)
#define DMA_BUF_SET_NAME_B _IOW(DMA_BUF_BASE, 1, u64)
#endif #endif
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment