Re: [PATCH v2] userfaultfd: fix UFFDIO_CONTINUE ioctl request definition

[Axel Rasmussen]

Thanks for catching this!

Reviewed-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>

On Tue, Jun 1, 2021 at 7:34 AM Gleb Fotengauer-Malinovskiy
<glebfm@xxxxxxxxxxxx> wrote:
>
> This ioctl request reads from uffdio_continue structure which justifies
> _IOC_READ flag.
> See NOTEs in include/uapi/asm-generic/ioctl.h for more information.
>
> Fixes: f619147104c8 ("userfaultfd: add UFFDIO_CONTINUE ioctl")
> Signed-off-by: Gleb Fotengauer-Malinovskiy <glebfm@xxxxxxxxxxxx>
> Acked-by: Peter Xu <peterx@xxxxxxxxxx>
> ---
>  include/uapi/linux/userfaultfd.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> v2 fix commit message
>
> diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h
> index bafbeb1a2624..650480f41f1d 100644
> --- a/include/uapi/linux/userfaultfd.h
> +++ b/include/uapi/linux/userfaultfd.h
> @@ -80,8 +80,8 @@
>                                       struct uffdio_zeropage)
>  #define UFFDIO_WRITEPROTECT    _IOWR(UFFDIO, _UFFDIO_WRITEPROTECT, \
>                                       struct uffdio_writeprotect)
> -#define UFFDIO_CONTINUE                _IOR(UFFDIO, _UFFDIO_CONTINUE,  \
> -                                    struct uffdio_continue)
> +#define UFFDIO_CONTINUE                _IOWR(UFFDIO, _UFFDIO_CONTINUE, \
> +                                     struct uffdio_continue)
>
>  /* read() structure */
>  struct uffd_msg {
> --
> glebfm
>