Thanks for the patch, Daniel! On Tue, 7 Apr 2020 at 19:00, Daniel Vetter <daniel.vetter@xxxxxxxx> wrote: > > The uapi is the same on 32 and 64 bit, but the number isnt. 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. Yes, it shouldn't have passed through the cracks; my apologies! > > 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> Martin, Could I request you to test this one with the 4 combinations of 32-bit / 64-bit userspace and kernel, and let us know that all 4 are working alright? If yes, please consider giving your tested-by here. > Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx> > --- > drivers/dma-buf/dma-buf.c | 3 ++- > include/uapi/linux/dma-buf.h | 4 ++++ > 2 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c > index 570c923023e6..1d923b8e4c59 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 dbc7092e04b5..21dfac815dc0 100644 > --- a/include/uapi/linux/dma-buf.h > +++ b/include/uapi/linux/dma-buf.h > @@ -39,6 +39,10 @@ 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 > -- > 2.25.1 > Best, Sumit.
