linux-kernel - [PATCH v6 14/19] userfaultfd: wp: enabled write protection in userfaultfd API

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200220163112.11409-15-peterx@redhat.com>
Date:   Thu, 20 Feb 2020 11:31:07 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Brian Geffon <bgeffon@...gle.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        David Hildenbrand <david@...hat.com>, peterx@...hat.com,
        Martin Cracauer <cracauer@...s.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mel Gorman <mgorman@...e.de>,
        Bobby Powers <bobbypowers@...il.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Maya Gokhale <gokhale2@...l.gov>,
        Johannes Weiner <hannes@...xchg.org>,
        Marty McFadden <mcfadden8@...l.gov>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Hugh Dickins <hughd@...gle.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Jerome Glisse <jglisse@...hat.com>, Shaohua Li <shli@...com>,
        Pavel Emelyanov <xemul@...allels.com>,
        Rik van Riel <riel@...hat.com>
Subject: [PATCH v6 14/19] userfaultfd: wp: enabled write protection in userfaultfd API

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>
Reviewed-by: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Signed-off-by: Peter Xu <peterx@...hat.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)
-- 
2.24.1