--- includes/GlobalFunctions.php	2006-05-23 12:27:25.000000000 +0200
+++ ../public_html/includes/GlobalFunctions.php	2006-06-09 11:14:37.664465762 +0200
@@ -1477,15 +1477,18 @@
 function wfMkdirParents( $fullDir, $mode ) {
 	$parts = explode( '/', $fullDir );
 	$path = '';
+	$umask = umask(0);
 
 	foreach ( $parts as $dir ) {
 		$path .= $dir . '/';
 		if ( !is_dir( $path ) ) {
 			if ( !mkdir( $path, $mode ) ) {
+				umask($umask);
 				return false;
 			}
 		}
 	}
+	umask($umask);
 	return true;
 }
 
--- includes/Math.php	2006-05-23 12:27:27.000000000 +0200
+++ ../public_html/includes/Math.php	2006-06-09 11:23:55.776940799 +0200
@@ -131,7 +131,7 @@
 				return $this->_error( 'math_bad_output' );
 			}
 
-			if( !rename( "$wgTmpDirectory/{$this->hash}.png", "$hashpath/{$this->hash}.png" ) ) {
+			if( !chmod("$wgTmpDirectory/{$this->hash}.png", 0644) || !rename( "$wgTmpDirectory/{$this->hash}.png", "$hashpath/{$this->hash}.png" ) ) {
 				return $this->_error( 'math_output_error' );
 			}