Description:
------------
xattr-1.0 is ignoring the open_basedir restriction.

Reproduce code:
---------------
<?php
$file = 'some_file_outside_the_open_basedir';
$user_attributes = xattr_list($file);

echo "\n User attributes: \n";
foreach ($user_attributes as $attr_name) {
    printf("%s\n", $attr_name);
}
?> 

Expected result:
----------------
PHP Warning:  xattr_list() function.xattr_list: open_basedir restriction in effect. File(/tmp/aaa) is not within the allowed path(s): (/var/www/html) in /var/www/html/xattr-bugcheck.php on line 5

Actual result:
--------------
names of actual attributes