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bpo-32329: Fix sys.flags.hash_randomization (#4875)

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sys.flags.hash_randomization is now properly set to 0 when hash
randomization is turned off by PYTHONHASHSEED=0.
This commit is contained in:
Victor Stinner 2017-12-15 01:39:48 +01:00 • committed by GitHub
parent d1cb1067a8
commit 22097aaa77
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5 changed files with 12 additions and 7 deletions
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9
Lib/test/test_cmd_line.py
View file

@ -426,10 +426,15 @@ class CmdLineTest(unittest.TestCase):
# Verify that sys.flags contains hash_randomization
code = 'import sys; print("random is", sys.flags.hash_randomization)'
rc, out, err = assert_python_ok('-c', code)
self.assertEqual(rc, 0)
rc, out, err = assert_python_ok('-c', code, PYTHONHASHSEED='')
self.assertIn(b'random is 1', out)
rc, out, err = assert_python_ok('-c', code, PYTHONHASHSEED='random')
self.assertIn(b'random is 1', out)
rc, out, err = assert_python_ok('-c', code, PYTHONHASHSEED='0')
self.assertIn(b'random is 0', out)
def test_del___main__(self):
# Issue #15001: PyRun_SimpleFileExFlags() did crash because it kept a
# borrowed reference to the dict of __main__ module and later modify

2
Misc/NEWS.d/next/Core and Builtins/2017-12-15-00-55-35.bpo-32329.XL1O99.rst Normal file
View file

@ -0,0 +1,2 @@
``sys.flags.hash_randomization`` is now properly set to 0 when hash
randomization is turned off by ``PYTHONHASHSEED=0``.

1
Modules/main.c
View file

@ -394,7 +394,6 @@ Py_Main(int argc, wchar_t **argv)
exit(1);
}
Py_HashRandomizationFlag = 1;
_PyRandom_Init();
PySys_ResetWarnOptions();

4
Python/pylifecycle.c
View file

@ -330,10 +330,6 @@ _Py_InitializeEx_Private(int install_sigs, int install_importlib)
Py_OptimizeFlag = add_flag(Py_OptimizeFlag, p);
if ((p = Py_GETENV("PYTHONDONTWRITEBYTECODE")) && *p != '\0')
Py_DontWriteBytecodeFlag = add_flag(Py_DontWriteBytecodeFlag, p);
/* The variable is only tested for existence here; _PyRandom_Init will
check its value further. */
if ((p = Py_GETENV("PYTHONHASHSEED")) && *p != '\0')
Py_HashRandomizationFlag = add_flag(Py_HashRandomizationFlag, p);
#ifdef MS_WINDOWS
if ((p = Py_GETENV("PYTHONLEGACYWINDOWSFSENCODING")) && *p != '\0')
Py_LegacyWindowsFSEncodingFlag = add_flag(Py_LegacyWindowsFSEncodingFlag, p);

3
Python/random.c
View file

@ -565,9 +565,11 @@ _PyRandom_Init(void)
if (seed == 0) {
/* disable the randomized hash */
memset(secret, 0, secret_size);
Py_HashRandomizationFlag = 0;
}
else {
lcg_urandom(seed, secret, secret_size);
Py_HashRandomizationFlag = 1;
}
}
else {
@ -582,6 +584,7 @@ _PyRandom_Init(void)
if (res < 0) {
Py_FatalError("failed to get random numbers to initialize Python");
}
Py_HashRandomizationFlag = 1;
}
}