From e06f1e1dd4998ffc9da37f580703b55a93fc4de4 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Mon, 6 Apr 2020 20:06:16 -0700 Subject: [PATCH] userfaultfd: wp: enabled write protection in userfaultfd API Now it's safe to enable write protection in userfaultfd API Signed-off-by: Shaohua Li Signed-off-by: Andrea Arcangeli Signed-off-by: Peter Xu Signed-off-by: Andrew Morton Reviewed-by: Jerome Glisse Reviewed-by: Mike Rapoport Cc: Andrea Arcangeli Cc: Rik van Riel Cc: Kirill A. Shutemov Cc: Mel Gorman Cc: Hugh Dickins Cc: Johannes Weiner Cc: Bobby Powers Cc: Brian Geffon Cc: David Hildenbrand Cc: Denis Plotnikov Cc: "Dr . David Alan Gilbert" Cc: Martin Cracauer Cc: Marty McFadden Cc: Maya Gokhale Cc: Mike Kravetz Cc: Pavel Emelyanov Link: http://lkml.kernel.org/r/20200220163112.11409-15-peterx@redhat.com Signed-off-by: Linus Torvalds --- 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 95c4a160e5f8e2..e7e98bde221f11 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)