--- tarfile.py.orig	2010-04-19 18:50:39.000000000 +0200
+++ tarfile.py	2010-04-19 18:52:24.000000000 +0200
@@ -380,7 +380,7 @@
         }[mode]
         if hasattr(os, "O_BINARY"):
             mode |= os.O_BINARY
-        self.fd = os.open(name, mode)
+        self.fd = os.open(name, mode, 0666)
 
     def close(self):
         os.close(self.fd)