Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)
in order to make algorithmic complexity attacks on (e.g.) web apps much more complicated.
The environment variable PYTHONHASHSEED and the new command line flag -R control this
behavior.
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index c688172..6a7e914 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -1126,6 +1126,7 @@
/* {"unbuffered", "-u"}, */
/* {"skip_first", "-x"}, */
{"bytes_warning", "-b"},
+ {"hash_randomization", "-R"},
{0}
};
@@ -1134,9 +1135,9 @@
flags__doc__, /* doc */
flags_fields, /* fields */
#ifdef RISCOS
- 12
+ 13
#else
- 11
+ 12
#endif
};
@@ -1169,6 +1170,7 @@
/* SetFlag(saw_unbuffered_flag); */
/* SetFlag(skipfirstline); */
SetFlag(Py_BytesWarningFlag);
+ SetFlag(Py_HashRandomizationFlag);
#undef SetFlag
if (PyErr_Occurred()) {