The patch titled
Subject: userfaultfd: wp: enabled write protection in userfaultfd API
has been added to the -mm tree. Its filename is
userfaultfd-wp-enabled-write-protection-in-userfaultfd-api.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-wp-enabled-write-protection-in-userfaultfd-api.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-wp-enabled-write-protection-in-userfaultfd-api.patch
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------------------------------------------------------
From: Shaohua Li <shli@xxxxxx>
Subject: userfaultfd: wp: enabled write protection in userfaultfd API
Now it's safe to enable write protection in userfaultfd API
Link: http://lkml.kernel.org/r/20200220163112.11409-15-peterx@xxxxxxxxxx
Signed-off-by: Shaohua Li <shli@xxxxxx>
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Reviewed-by: Jerome Glisse <jglisse@xxxxxxxxxx>
Reviewed-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Bobby Powers <bobbypowers@xxxxxxxxx>
Cc: Brian Geffon <bgeffon@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Denis Plotnikov <dplotnikov@xxxxxxxxxxxxx>
Cc: "Dr . David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Martin Cracauer <cracauer@xxxxxxxx>
Cc: Marty McFadden <mcfadden8@xxxxxxxx>
Cc: Maya Gokhale <gokhale2@xxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/uapi/linux/userfaultfd.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/include/uapi/linux/userfaultfd.h~userfaultfd-wp-enabled-write-protection-in-userfaultfd-api
+++ a/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)
_
Patches currently in -mm which might be from shli@xxxxxx are
userfaultfd-wp-add-helper-for-writeprotect-check.patch
userfaultfd-wp-support-write-protection-for-userfault-vma-range.patch
userfaultfd-wp-enabled-write-protection-in-userfaultfd-api.patch
