From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 621C8C04EB9 for ; Mon, 3 Dec 2018 08:34:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34B0D20851 for ; Mon, 3 Dec 2018 08:34:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 34B0D20851 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=fromorbit.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nfs-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725953AbeLCIej (ORCPT ); Mon, 3 Dec 2018 03:34:39 -0500 Received: from ipmailnode02.adl6.internode.on.net ([150.101.137.148]:60959 "EHLO ipmailnode02.adl6.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725952AbeLCIeg (ORCPT ); Mon, 3 Dec 2018 03:34:36 -0500 Received: from ppp59-167-129-252.static.internode.on.net (HELO dastard) ([59.167.129.252]) by ipmail02.adl6.internode.on.net with ESMTP; 03 Dec 2018 19:04:20 +1030 Received: from discord.disaster.area ([192.168.1.111]) by dastard with esmtp (Exim 4.80) (envelope-from ) id 1gTjgJ-0003PV-1v; Mon, 03 Dec 2018 19:34:19 +1100 Received: from dave by discord.disaster.area with local (Exim 4.91) (envelope-from ) id 1gTjgJ-000067-0q; Mon, 03 Dec 2018 19:34:19 +1100 From: Dave Chinner To: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org Cc: olga.kornievskaia@gmail.com, linux-nfs@vger.kernel.org, linux-unionfs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-cifs@vger.kernel.org Subject: [PATCH 05/11] vfs: use inode_permission in copy_file_range() Date: Mon, 3 Dec 2018 19:34:10 +1100 Message-Id: <20181203083416.28978-6-david@fromorbit.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181203083416.28978-1-david@fromorbit.com> References: <20181203083416.28978-1-david@fromorbit.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: Dave Chinner Similar to FI_DEDUPERANGE, make copy_file_range() check that we have write permissions to the destination inode. Signed-off-by: Dave Chinner --- mm/filemap.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/filemap.c b/mm/filemap.c index 0a170425935b..876df5275514 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3013,6 +3013,11 @@ int generic_copy_file_checks(struct file *file_in, loff_t pos_in, (file_out->f_flags & O_APPEND)) return -EBADF; + /* may sure we really are allowed to write to the destination inode */ + ret = inode_permission(inode_out, MAY_WRITE); + if (ret < 0) + return ret; + /* Ensure offsets don't wrap. */ if (pos_in + count < pos_in || pos_out + count < pos_out) return -EOVERFLOW; -- 2.19.1