commit 1e13eb084f72d5993cbb726e45b36bdb69c83a24
author Barry Warsaw <barry@python.org> Mon Feb 20 20:42:21 2012 -0500
committer Barry Warsaw <barry@python.org> Mon Feb 20 20:42:21 2012 -0500
tree 1db691c15c5980a870bcc2606a6d2afc77e28bad
parent f5a5beb33985b4b55480de267084b90d89a5c5c4

- Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
  environment variable, to provide an opt-in way to protect against denial of
  service attacks due to hash collisions within the dict and set types.  Patch
  by David Malcolm, based on work by Victor Stinner.

Python/sysmodule.c

diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 91fe224..e73e5c2 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1224,6 +1224,7 @@
     {"unicode",                 "-U"},
     /* {"skip_first",                   "-x"}, */
     {"bytes_warning", "-b"},
+    {"hash_randomization", "-R"},
     {0}
 };
 
@@ -1232,9 +1233,9 @@
     flags__doc__,       /* doc */
     flags_fields,       /* fields */
 #ifdef RISCOS
-    16
+    17
 #else
-    15
+    16
 #endif
 };
 
@@ -1271,6 +1272,7 @@
     SetFlag(Py_UnicodeFlag);
     /* SetFlag(skipfirstline); */
     SetFlag(Py_BytesWarningFlag);
+    SetFlag(Py_HashRandomizationFlag);
 #undef SetFlag
 
     if (PyErr_Occurred()) {