diff -up Python-2.7rc1/Modules/_ctypes/callbacks.c.selinux Python-2.7rc1/Modules/_ctypes/callbacks.c
--- Python-2.7rc1/Modules/_ctypes/callbacks.c.selinux	2010-05-09 10:46:46.000000000 -0400
+++ Python-2.7rc1/Modules/_ctypes/callbacks.c	2010-06-08 08:44:18.357366200 -0400
@@ -21,8 +21,8 @@ CThunkObject_dealloc(PyObject *_self)
     Py_XDECREF(self->converters);
     Py_XDECREF(self->callable);
     Py_XDECREF(self->restype);
-    if (self->pcl)
-        _ctypes_free_closure(self->pcl);
+    if (self->pcl_write)
+        ffi_closure_free(self->pcl_write);
     PyObject_GC_Del(self);
 }
 
@@ -391,7 +391,8 @@ static CThunkObject* CThunkObject_new(Py
         return NULL;
     }
 
-    p->pcl = NULL;
+    p->pcl_exec = NULL;
+    p->pcl_write = NULL;
     memset(&p->cif, 0, sizeof(p->cif));
     p->converters = NULL;
     p->callable = NULL;
@@ -421,8 +422,9 @@ CThunkObject *_ctypes_alloc_callback(PyO
 
     assert(CThunk_CheckExact(p));
 
-    p->pcl = _ctypes_alloc_closure();
-    if (p->pcl == NULL) {
+    p->pcl_write = ffi_closure_alloc(sizeof(ffi_closure),
+                                     &p->pcl_exec);
+    if (p->pcl_write == NULL) {
         PyErr_NoMemory();
         goto error;
     }
@@ -467,7 +469,9 @@ CThunkObject *_ctypes_alloc_callback(PyO
                      "ffi_prep_cif failed with %d", result);
         goto error;
     }
-    result = ffi_prep_closure(p->pcl, &p->cif, closure_fcn, p);
+    result = ffi_prep_closure_loc(p->pcl_write, &p->cif, closure_fcn,
+                                  p,
+                                  p->pcl_exec);
     if (result != FFI_OK) {
         PyErr_Format(PyExc_RuntimeError,
                      "ffi_prep_closure failed with %d", result);
diff -up Python-2.7rc1/Modules/_ctypes/_ctypes.c.selinux Python-2.7rc1/Modules/_ctypes/_ctypes.c
--- Python-2.7rc1/Modules/_ctypes/_ctypes.c.selinux	2010-05-09 10:46:46.000000000 -0400
+++ Python-2.7rc1/Modules/_ctypes/_ctypes.c	2010-06-07 23:19:39.950146038 -0400
@@ -3463,7 +3463,7 @@ PyCFuncPtr_new(PyTypeObject *type, PyObj
     self->callable = callable;
 
     self->thunk = thunk;
-    *(void **)self->b_ptr = (void *)thunk->pcl;
+    *(void **)self->b_ptr = (void *)thunk->pcl_exec;
 
     Py_INCREF((PyObject *)thunk); /* for KeepRef */
     if (-1 == KeepRef((CDataObject *)self, 0, (PyObject *)thunk)) {
diff -up Python-2.7rc1/Modules/_ctypes/ctypes.h.selinux Python-2.7rc1/Modules/_ctypes/ctypes.h
--- Python-2.7rc1/Modules/_ctypes/ctypes.h.selinux	2010-05-09 10:46:46.000000000 -0400
+++ Python-2.7rc1/Modules/_ctypes/ctypes.h	2010-06-07 23:19:39.950146038 -0400
@@ -95,7 +95,8 @@ struct tagCDataObject {
 
 typedef struct {
     PyObject_VAR_HEAD
-    ffi_closure *pcl; /* the C callable */
+    ffi_closure *pcl_write; /* the C callable, writeable */
+    void *pcl_exec;         /* the C callable, executable */
     ffi_cif cif;
     int flags;
     PyObject *converters;
diff -up Python-2.7rc1/setup.py.selinux Python-2.7rc1/setup.py
--- Python-2.7rc1/setup.py.selinux	2010-06-07 23:19:39.922147795 -0400
+++ Python-2.7rc1/setup.py	2010-06-07 23:19:39.951145942 -0400
@@ -1864,8 +1864,7 @@ class PyBuildExt(build_ext):
                    '_ctypes/callbacks.c',
                    '_ctypes/callproc.c',
                    '_ctypes/stgdict.c',
-                   '_ctypes/cfield.c',
-                   '_ctypes/malloc_closure.c']
+                   '_ctypes/cfield.c']
         depends = ['_ctypes/ctypes.h']
 
         if sys.platform == 'darwin':