wordpress security hack for allowing theme/plugin/images uploads but not core upgrade (with different file owner permissions check)

file.php.diff

commit 670110b (HEAD, virageadroite)
Author: Michaël Marinetti <[email protected]>
Date:   12 minutes ago

    Add: security wp-content

diff --git a/wp-admin/includes/file.php b/wp-admin/includes/file.php
index 078a369..d11c9f3 100644
--- a/wp-admin/includes/file.php
+++ b/wp-admin/includes/file.php
@@ -976,7 +976,8 @@ function get_filesystem_method( $args = array(), $context = false, $allow_relaxe
                        // Attempt to determine the file owner of the WordPress files, and that of newly created files
                        $wp_file_owner = $temp_file_owner = false;
                        if ( function_exists('fileowner') ) {
-                               $wp_file_owner = @fileowner( __FILE__ );
+                               //$wp_file_owner = @fileowner( __FILE__ );
+                               $wp_file_owner = @fileowner( $context ); // CHANGED FOR ALLOWING ONLY wp-content writings
                                $temp_file_owner = @fileowner( $temp_file_name );
                        }