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Shutemov" , Maya Gokhale , Johannes Weiner , Marty McFadden , Denis Plotnikov , Hugh Dickins , "Dr . David Alan Gilbert" , Jerome Glisse , Shaohua Li , Pavel Emelyanov , Rik van Riel Subject: [PATCH v6 14/19] userfaultfd: wp: enabled write protection in userfaultfd API Date: Thu, 20 Feb 2020 11:31:07 -0500 Message-Id: <20200220163112.11409-15-peterx@redhat.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200220163112.11409-1-peterx@redhat.com> References: <20200220163112.11409-1-peterx@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Shaohua Li Now it's safe to enable write protection in userfaultfd API Cc: Andrea Arcangeli Cc: Pavel Emelyanov Cc: Rik van Riel Cc: Kirill A. Shutemov Cc: Mel Gorman Cc: Hugh Dickins Cc: Johannes Weiner Signed-off-by: Shaohua Li Signed-off-by: Andrea Arcangeli Reviewed-by: Jerome Glisse Reviewed-by: Mike Rapoport Signed-off-by: Peter Xu --- 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/userfaul= tfd.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 |=09=09\ +#define UFFD_API_FEATURES (UFFD_FEATURE_PAGEFAULT_FLAG_WP |=09\ +=09=09=09 UFFD_FEATURE_EVENT_FORK |=09=09\ =09=09=09 UFFD_FEATURE_EVENT_REMAP |=09=09\ =09=09=09 UFFD_FEATURE_EVENT_REMOVE |=09\ =09=09=09 UFFD_FEATURE_EVENT_UNMAP |=09=09\ @@ -34,7 +35,8 @@ #define UFFD_API_RANGE_IOCTLS=09=09=09\ =09((__u64)1 << _UFFDIO_WAKE |=09=09\ =09 (__u64)1 << _UFFDIO_COPY |=09=09\ -=09 (__u64)1 << _UFFDIO_ZEROPAGE) +=09 (__u64)1 << _UFFDIO_ZEROPAGE |=09=09\ +=09 (__u64)1 << _UFFDIO_WRITEPROTECT) #define UFFD_API_RANGE_IOCTLS_BASIC=09=09\ =09((__u64)1 << _UFFDIO_WAKE |=09=09\ =09 (__u64)1 << _UFFDIO_COPY) --=20 2.24.1