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os.putenv() on Windows truncates value on an embedded NUL #111841
Description
os.putenv() on Windows truncates a value containing an embedded null character.
>>> import os
>>> os.putenv('xyz', 'abc\0def')
>>> os.system('''python.bat -c "import os; print(repr(os.environ['xyz']))"''')
Running Debug|x64 interpreter...
'abc'
0os.putenv() and os.unsetenv() also truncate a name. It leads to OSError because it truncates before "=".
>>> os.putenv('abc\0def', 'xyz')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
os.putenv('abc\0def', 'xyz')
OSError: [Errno 22] Invalid argument
>>> os.unsetenv('abc\0def')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
os.unsetenv('abc\0def')
OSError: [Errno 22] Invalid argument
Activity
pythongh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL …
[-]os.putenv() on Windows truncates on an embedded NUL[/-][+]os.putenv() on Windows truncates value on an embedded NUL[/+]vstinner commentedon Nov 9, 2023
Only the value is truncated if it contains embedded null character.
Python doesn't check for embedded null character in the variable name, but as you write, OSError is raised if the name is truncated. And Python rejects name which contains "=", so
os.putenv('a=1\0', 'ignore')raises ValueError.pythongh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL …
pythongh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL …
gh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL on Win…
[3.12] gh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL…
[3.11] gh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL…
pythongh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL …
pythongh-111841: Fix os.putenv() and os.unsetenv() with embedded NUL …