From patchwork Fri Oct 5 00:45:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. 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Wong" To: david@fromorbit.com, darrick.wong@oracle.com Date: Thu, 04 Oct 2018 17:45:00 -0700 Message-ID: <153870030069.29072.11055871953561649172.stgit@magnolia> In-Reply-To: <153870027422.29072.7433543674436957232.stgit@magnolia> References: <153870027422.29072.7433543674436957232.stgit@magnolia> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-btrfs@vger.kernel.org, sandeen@redhat.com Subject: [Ocfs2-devel] [PATCH 04/15] xfs: update ctime and remove suid before cloning files X-BeenThere: ocfs2-devel@oss.oracle.com X-Mailman-Version: 2.1.9 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: ocfs2-devel-bounces@oss.oracle.com Errors-To: ocfs2-devel-bounces@oss.oracle.com X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9036 signatures=668706 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810050006 X-Virus-Scanned: ClamAV using ClamSMTP From: Darrick J. Wong Before cloning into a file, update the ctime and remove sensitive attributes like suid, just like we'd do for a regular file write. Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_reflink.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 55da7e1154f4..d8f209bc8937 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1239,6 +1239,7 @@ xfs_reflink_zero_posteof( * Prepare two files for range cloning. Upon a successful return both inodes * will have the iolock and mmaplock held, the page cache of the out file * will be truncated, and any leases on the out file will have been broken. + * This function borrows heavily from xfs_file_aio_write_checks. */ STATIC int xfs_reflink_remap_prep( @@ -1302,6 +1303,30 @@ xfs_reflink_remap_prep( /* Zap any page cache for the destination file's range. */ truncate_inode_pages_range(&inode_out->i_data, pos_out, PAGE_ALIGN(pos_out + len) - 1); + + /* If we're altering the file contents... */ + if (!is_dedupe) { + /* + * ...update the timestamps (which will grab the ilock again + * from xfs_fs_dirty_inode, so we have to call it before we + * take the ilock). + */ + if (!(file_out->f_mode & FMODE_NOCMTIME)) { + ret = file_update_time(file_out); + if (ret) + goto out_unlock; + } + + /* + * ...clear the security bits if the process is not being run + * by root. This keeps people from modifying setuid and setgid + * binaries. + */ + ret = file_remove_privs(file_out); + if (ret) + goto out_unlock; + } + return 0; out_unlock: xfs_reflink_remap_unlock(file_in, file_out);