This is a note to let you know that I've just added the patch titled
dma-buf: Fix SET_NAME ioctl uapi
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dma-buf-fix-set_name-ioctl-uapi.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 603276b297657b38c1d246472279f669c53a26c9
Author: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Date: Tue Apr 7 15:30:02 2020 +0200
dma-buf: Fix SET_NAME ioctl uapi
commit a5bff92eaac45bdf6221badf9505c26792fdf99e upstream.
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@xxxxxxxxxx>
Cc: Chenbo Feng <fengc@xxxxxxxxxx>
Cc: Greg Hackmann <ghackmann@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Cc: minchan@xxxxxxxxxx
Cc: surenb@xxxxxxxxxx
Cc: jenhaochen@xxxxxxxxxx
Cc: Martin Liu <liumartin@xxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Tested-by: Martin Liu <liumartin@xxxxxxxxxx>
Reviewed-by: Martin Liu <liumartin@xxxxxxxxxx>
Signed-off-by: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
[sumits: updated some checkpatch fixes, corrected author email]
Link: https://patchwork.freedesktop.org/patch/msgid/20200407133002.3486387-1-daniel.vetter@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 0fb0358f00736..adc88e1dc999a 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -388,7 +388,8 @@ static long dma_buf_ioctl(struct file *file,
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);
default:
diff --git a/include/uapi/linux/dma-buf.h b/include/uapi/linux/dma-buf.h
index dbc7092e04b5a..7f30393b92c3b 100644
--- a/include/uapi/linux/dma-buf.h
+++ b/include/uapi/linux/dma-buf.h
@@ -39,6 +39,12 @@ struct dma_buf_sync {
#define DMA_BUF_BASE 'b'
#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_A _IOW(DMA_BUF_BASE, 1, u32)
+#define DMA_BUF_SET_NAME_B _IOW(DMA_BUF_BASE, 1, u64)
#endif
