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Merge from 3.1: 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 21:31:46 +01:00
commit 09a7c72cad
34 changed files with 676 additions and 162 deletions
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16
Lib/test/test_cmd_line.py
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@ -330,6 +330,22 @@ class CmdLineTest(unittest.TestCase):
def test_no_std_streams(self):
self._test_no_stdio(['stdin', 'stdout', 'stderr'])
def test_hash_randomization(self):
# Verify that -R enables hash randomization:
self.verify_valid_flag('-R')
hashes = []
for i in range(2):
code = 'print(hash("spam"))'
rc, out, err = assert_python_ok('-R', '-c', code)
self.assertEqual(rc, 0)
hashes.append(out)
self.assertNotEqual(hashes[0], hashes[1])
# Verify that sys.flags contains hash_randomization
code = 'import sys; print("random is", sys.flags.hash_randomization)'
rc, out, err = assert_python_ok('-R', '-c', code)
self.assertEqual(rc, 0)
self.assertIn(b'random is 1', out)
def test_main():
test.support.run_unittest(CmdLineTest)