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Issue #13703: add a way to randomize the hash values of basic types (str, bytes, datetime)

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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.
This commit is contained in:
Georg Brandl 2012-02-20 19:54:16 +01:00
parent ec1712a166
commit 2daf6ae249
32 changed files with 660 additions and 152 deletions
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6
Python/sysmodule.c
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@ -1126,6 +1126,7 @@ static PyStructSequence_Field flags_fields[] = {
/* {"unbuffered", "-u"}, */
/* {"skip_first", "-x"}, */
{"bytes_warning", "-b"},
{"hash_randomization", "-R"},
{0}
};
@ -1134,9 +1135,9 @@ static PyStructSequence_Desc flags_desc = {
flags__doc__, /* doc */
flags_fields, /* fields */
#ifdef RISCOS
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#else
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#endif
};
@ -1169,6 +1170,7 @@ make_flags(void)
/* SetFlag(saw_unbuffered_flag); */
/* SetFlag(skipfirstline); */
SetFlag(Py_BytesWarningFlag);
SetFlag(Py_HashRandomizationFlag);
#undef SetFlag
if (PyErr_Occurred()) {