Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753259Ab3F2UMR (ORCPT ); Sat, 29 Jun 2013 16:12:17 -0400 Received: from mail-ie0-f178.google.com ([209.85.223.178]:57766 "EHLO mail-ie0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753115Ab3F2UMP (ORCPT ); Sat, 29 Jun 2013 16:12:15 -0400 Date: Sat, 29 Jun 2013 13:12:14 -0700 (PDT) From: Rob Landley Cc: Al Viro , "Eric W. Biederman" To: linux-kernel@vger.kernel.org In-Reply-To: <1372536729.850447@landley.net> Message-Id: <1372536729.850656@landley.net> Subject: [PATCH 1/5] initmpfs: replace MS_NOUSER in initramfs Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1156 Lines: 36 From: Rob Landley Mounting MS_NOUSER prevents --bind mounts from rootfs. Prevent new rootfs mounts with a different mechanism that doesn't affect bind mounts. Signed-off-by: Rob Landley --- fs/ramfs/inode.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index c24f1e1..14b9c35 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -247,7 +247,14 @@ struct dentry *ramfs_mount(struct file_system_type *fs_type, static struct dentry *rootfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { - return mount_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super); + static int once; + + if (once) + return ERR_PTR(-ENODEV); + else + once++; + + return mount_nodev(fs_type, flags, data, ramfs_fill_super); } static void ramfs_kill_sb(struct super_block *sb) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/