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Tue, 7 Apr 2020 03:06:18 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3D3C821775; Tue, 7 Apr 2020 03:06:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586228778; bh=AHu+50i1TqcQZEvYbXO9v9ejJV6qtjfFFC1WwmISLnw=; h=Date:From:To:Subject:In-Reply-To:From; b=XuB3m+B3q8sVn2brdGjoNe7CLrRRnbNMlewNgWqP6Mm0jPTOSbUcGsVYljERve1Zm AaFmUl6idtdIChIPfsQ9MJVLkpgMzLS+yJKrlFFZJLgx/PRlOmO8/c3Mi87AkaBYxK YEjrcLFO7Ao900hjOYq4qD9AAgHaE9CEKTW8EXfo= Date: Mon, 06 Apr 2020 20:06:16 -0700 From: Andrew Morton To: aarcange@redhat.com, akpm@linux-foundation.org, bgeffon@google.com, bobbypowers@gmail.com, cracauer@cons.org, david@redhat.com, dgilbert@redhat.com, dplotnikov@virtuozzo.com, gokhale2@llnl.gov, hannes@cmpxchg.org, hughd@google.com, jglisse@redhat.com, kirill@shutemov.name, linux-mm@kvack.org, mcfadden8@llnl.gov, mgorman@suse.de, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, peterx@redhat.com, riel@redhat.com, rppt@linux.vnet.ibm.com, shli@fb.com, torvalds@linux-foundation.org, xemul@openvz.org Subject: [patch 046/166] userfaultfd: wp: enabled write protection in userfaultfd API Message-ID: <20200407030616.aSH2sX0OS%akpm@linux-foundation.org> In-Reply-To: <20200406200254.a69ebd9e08c4074e41ddebaf@linux-foundation.org> User-Agent: s-nail v14.8.16 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 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@redhat.com Signed-off-by: Shaohua Li Signed-off-by: Andrea Arcangeli Signed-off-by: Peter Xu 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 Signed-off-by: Andrew Morton --- 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)