Hash collision security issue

Modules/posixmodule.c

 
 /* POSIX module implementation */
 
 /* This file is also used for Windows NT/MS-Win and OS/2.  In that case the
    module actually calls itself 'nt' or 'os2', not 'posix', and a few
    functions are either unimplemented or implemented differently.  The source
    assumes that for Windows NT, the macro 'MS_WINDOWS' is defined independent
    of the compiler used.  Different compilers define their own feature
    test macro, e.g. '__BORLANDC__' or '_MSC_VER'.  For OS/2, the compiler
    independent macro PYOS_OS2 should be defined.  On OS/2 the default
@@ skipping 4004 matching lines @@
     PyObject *result = NULL;
 
 #ifdef NGROUPS_MAX
 #define MAX_GROUPS NGROUPS_MAX
 #else
     /* defined to be 16 on Solaris7, so this should be a small number */
 #define MAX_GROUPS 64
 #endif
     gid_t grouplist[MAX_GROUPS];
 
-    /* On MacOSX getgroups(2) can return more than MAX_GROUPS results 
+    /* On MacOSX getgroups(2) can return more than MAX_GROUPS results
      * This is a helper variable to store the intermediate result when
      * that happens.
      *
      * To keep the code readable the OSX behaviour is unconditional,
      * according to the POSIX spec this should be safe on all unix-y
      * systems.
      */
     gid_t* alt_grouplist = grouplist;
     int n;
 
@@ skipping 2938 matching lines @@
         if (codeset != NULL && codeset[0] != 0)
             return PyUnicode_FromString(codeset);
     }
 #endif
     Py_INCREF(Py_None);
     return Py_None;
 }
 
 PyDoc_STRVAR(posix_urandom__doc__,
 "urandom(n) -> str\n\n\
-Return n pseudo-random bytes.");
+Return n random bytes suitable for cryptographic use.");
 
 static PyObject *
 posix_urandom(PyObject *self, PyObject *args)
 {
     Py_ssize_t size;
     PyObject *result;
     int ret;
- 
+
      /* Read arguments */
     if (!PyArg_ParseTuple(args, "n:urandom", &size))
         return NULL;
     if (size < 0)
         return PyErr_Format(PyExc_ValueError,
                             "negative argument not allowed");
     result = PyBytes_FromStringAndSize(NULL, size);
     if (result == NULL)
         return NULL;
 
@@ skipping 696 matching lines @@
 
 
 #endif /* __APPLE__ */
     return m;
 
 }
 
 #ifdef __cplusplus
 }
 #endif