linux-kernel - Re: [PATCH v3 22/28] userfaultfd: wp: enabled write protection in userfaultfd API

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Date:   Fri, 22 Mar 2019 23:37:19 +0200
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Maya Gokhale <gokhale2@...l.gov>,
        Jerome Glisse <jglisse@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Martin Cracauer <cracauer@...s.org>, Shaohua Li <shli@...com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Marty McFadden <mcfadden8@...l.gov>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Pavel Emelyanov <xemul@...allels.com>,
        Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v3 22/28] userfaultfd: wp: enabled write protection in
 userfaultfd API

On Wed, Mar 20, 2019 at 10:06:36AM +0800, Peter Xu wrote:
> From: Shaohua Li <shli@...com>
> 
> Now it's safe to enable write protection in userfaultfd API
> 
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: Pavel Emelyanov <xemul@...allels.com>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Kirill A. Shutemov <kirill@...temov.name>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Shaohua Li <shli@...com>
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> Reviewed-by: Jerome Glisse <jglisse@...hat.com>
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Mike Rapoport <rppt@...ux.ibm.com>

> ---
>  include/uapi/linux/userfaultfd.h | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h
> index 95c4a160e5f8..e7e98bde221f 100644
> --- a/include/uapi/linux/userfaultfd.h
> +++ b/include/uapi/linux/userfaultfd.h
> @@ -19,7 +19,8 @@
>   * means the userland is reading).
>   */
>  #define UFFD_API ((__u64)0xAA)
> -#define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK |		\
> +#define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP |	\
> +			   UFFD_FEATURE_EVENT_FORK |		\
>  			   UFFD_FEATURE_EVENT_REMAP |		\
>  			   UFFD_FEATURE_EVENT_REMOVE |	\
>  			   UFFD_FEATURE_EVENT_UNMAP |		\
> @@ -34,7 +35,8 @@
>  #define UFFD_API_RANGE_IOCTLS			\
>  	((__u64)1 << _UFFDIO_WAKE |		\
>  	 (__u64)1 << _UFFDIO_COPY |		\
> -	 (__u64)1 << _UFFDIO_ZEROPAGE)
> +	 (__u64)1 << _UFFDIO_ZEROPAGE |		\
> +	 (__u64)1 << _UFFDIO_WRITEPROTECT)
>  #define UFFD_API_RANGE_IOCTLS_BASIC		\
>  	((__u64)1 << _UFFDIO_WAKE |		\
>  	 (__u64)1 << _UFFDIO_COPY)
> -- 
> 2.17.1
> 

-- 
Sincerely yours,
Mike.