https://github.com/python/cpython/commit/b39636047bfaa0c88c9bc743e2a452cf7b97b56c commit: b39636047bfaa0c88c9bc743e2a452cf7b97b56c branch: 3.11 author: Miss Islington (bot) <[email protected]> committer: hugovk <[email protected]> date: 2024-08-09T16:57:50+03:00 summary:
[3.11] gh-114539: Clarify implicit launching of shells by subprocess (GH-117996) (#118003) Co-authored-by: Steve Dower <[email protected]> files: M Doc/library/subprocess.rst diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst index f2d0f83bb68b94..c0ae9e5d7aae68 100644 --- a/Doc/library/subprocess.rst +++ b/Doc/library/subprocess.rst @@ -756,8 +756,8 @@ Exceptions defined in this module all inherit from :exc:`SubprocessError`. Security Considerations ----------------------- -Unlike some other popen functions, this implementation will never -implicitly call a system shell. This means that all characters, +Unlike some other popen functions, this library will not +implicitly choose to call a system shell. This means that all characters, including shell metacharacters, can safely be passed to child processes. If the shell is invoked explicitly, via ``shell=True``, it is the application's responsibility to ensure that all whitespace and metacharacters are @@ -766,6 +766,14 @@ quoted appropriately to avoid vulnerabilities. On :ref:`some platforms <shlex-quote-warning>`, it is possible to use :func:`shlex.quote` for this escaping. +On Windows, batch files (:file:`*.bat` or :file:`*.cmd`) may be launched by the +operating system in a system shell regardless of the arguments passed to this +library. This could result in arguments being parsed according to shell rules, +but without any escaping added by Python. If you are intentionally launching a +batch file with arguments from untrusted sources, consider passing +``shell=True`` to allow Python to escape special characters. See :gh:`114539` +for additional discussion. + Popen Objects ------------- _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/python-checkins.python.org/ Member address: [email protected]
