FAILED: patch "[PATCH] mnt: Fix fs_fully_visible to verify the root directory is" failed to apply to 3.10-stable tree

The patch below does not apply to the 3.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From: "Eric W. Biederman" <[email protected]>
Date: Fri, 8 May 2015 16:36:50 -0500
Subject: [PATCH] mnt: Fix fs_fully_visible to verify the root directory is
visible

This fixes a dumb bug in fs_fully_visible that allows proc or sys to be mounted if there is a bind mount of part of /proc/ or /sys/ visible.

index 1f4f9dac6e5a..1b9e11167bae 100644
@@ -3179,6 +3179,12 @@ bool fs_fully_visible(struct file_system_type *type)
 		if (mnt->mnt.mnt_sb->s_type != type)
 			continue;
 
+		/* This mount is not fully visible if it's root directory
+		 * is not the root directory of the filesystem.
+		 */
+		if (mnt->mnt.mnt_root != mnt->mnt.mnt_sb->s_root)
+			continue;
+
 		/* This mount is not fully visible if there are any child mounts
 		 * that cover anything except for empty directories.
 		 */