RFC: pwritev2 regression test for invalid flags

[Christoph Hellwig]

On Thu, Jun 01, 2017 at 11:52:25AM -0600, Jon Derrick wrote:
> Can you apply the patch below to your kernel?

I've already sent this patch to Al twice (including a stable tag),
but it didn't seem to make it anywhere.

> diff --git a/fs/read_write.c b/fs/read_write.c
> index c4f88af..f77eb22 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -1210,7 +1210,7 @@ static size_t compat_writev(struct file *file,
>         if (!(file->f_mode & FMODE_CAN_WRITE))
>                 goto out;
> 
> -       ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, 0);
> +       ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, flags);
> 
>  out:
>         if (ret > 0)
---end quoted text---