Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(revision 88680)
+++ Modules/posixmodule.c	(working copy)
@@ -2974,6 +2974,8 @@
     res = mkdir(path);
 #else
     res = mkdir(path, mode);
+    if (res == 0)
+        res = chmod(path, mode);
 #endif
     Py_END_ALLOW_THREADS
     if (res < 0)
@@ -8321,6 +8323,10 @@
     path = PyBytes_AsString(opath);
     Py_BEGIN_ALLOW_THREADS
     res = mkdirat(dirfd, path, mode);
+#ifdef HAVE_FCHMODAT
+    if (res == 0)
+        res = fchmodat(dirfd, path, mode, 0);
+#endif
     Py_END_ALLOW_THREADS
     Py_DECREF(opath);
     if (res < 0)