Hash collision security issue

Objects/object.c

 
 /* Generic object operations; and implementation of None (NoObject) */
 
 #include "Python.h"
 #include "sliceobject.h" /* For PyEllipsis_Type */
 #include "frameobject.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ skipping 694 matching lines @@
 }
 
 long
 PyObject_HashNotImplemented(PyObject *v)
 {
     PyErr_Format(PyExc_TypeError, "unhashable type: '%.200s'",
                  Py_TYPE(v)->tp_name);
     return -1;
 }
 
+_Py_HashSecret_t _Py_HashSecret;
+
 long
 PyObject_Hash(PyObject *v)
 {
     PyTypeObject *tp = Py_TYPE(v);
     if (tp->tp_hash != NULL)
         return (*tp->tp_hash)(v);
     /* To keep to the general practice that inheriting
      * solely from object in C code should work without
      * an explicit call to PyType_Ready, we implicitly call
      * PyType_Ready here and then check the tp_hash slot again
@@ skipping 1158 matching lines @@
         assert(op->ob_refcnt == 0);
         ++_PyTrash_delete_nesting;
         (*dealloc)(op);
         --_PyTrash_delete_nesting;
     }
 }
 
 #ifdef __cplusplus
 }
 #endif