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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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5
Lib/test/regrtest.py
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@ -428,6 +428,11 @@ def main(tests=None, testdir=None, verbose=0, quiet=False, generate=False,
except ValueError:
print("Couldn't find starting test (%s), using all tests" % start)
if randomize:
hashseed = os.getenv('PYTHONHASHSEED')
if not hashseed:
os.environ['PYTHONHASHSEED'] = str(random_seed)
os.execv(sys.executable, [sys.executable] + sys.argv)
return
random.seed(random_seed)
print("Using random seed", random_seed)
random.shuffle(tests)