TOCTTOU in File::Path::rmtree() Version 2.12 (continued 3)

• But wait a minute! Is insufficient permissions the only reason we might be unable to chdir into $root?

  • No! What if, between here:

        my ( $ldev, $lino, $perm ) = ( lstat $root )[ 0, 1, 2 ]

• ... and here:

            if ( !chdir($root) ) {

• ... another process snuck in and changed what $root was

• ... perhaps from a directory to a symlink to a plain-text file?