[issue30730] [security] Injecting environment variable in subprocess on Windows

[STINNER Victor]

STINNER Victor added the comment:

I rebased my "[3.4] Backport CI config from master" PR #2475 on top of 3.4 to test the new security fixes, but a few test_subprocess tests failed:

https://github.com/python/cpython/pull/2475
https://travis-ci.org/python/cpython/jobs/252804589

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ERROR: test_invalid_cmd (test.test_subprocess.ProcessTestCase)

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Traceback (most recent call last):

  File "/home/travis/build/python/cpython/Lib/test/test_subprocess.py", line 613, in test_invalid_cmd

    subprocess.Popen([cmd, "-c", "pass"])

  File "/home/travis/build/python/cpython/Lib/subprocess.py", line 856, in __init__

    restore_signals, start_new_session)

  File "/home/travis/build/python/cpython/Lib/subprocess.py", line 1402, in _execute_child

    restore_signals, start_new_session, preexec_fn)

TypeError: expected bytes with no null

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nosy: +haypo

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