https://github.com/python/cpython/commit/a4b44d39cd6941cc03590fee7538776728bdfd0a
commit: a4b44d39cd6941cc03590fee7538776728bdfd0a
branch: main
author: Steve Dower <steve.dower@python.org>
committer: zooba <steve.dower@microsoft.com>
date: 2024-04-17T19:32:47+01:00
summary:
gh-114539: Clarify implicit launching of shells by subprocess (GH-117996)
files:
M Doc/library/subprocess.rst
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index 49194b82b4cea2..1cd233173e85e1 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -754,8 +754,8 @@ 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
@@ -764,6 +764,14 @@ 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
-------------
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commit: a4b44d39cd6941cc03590fee7538776728bdfd0a
branch: main
author: Steve Dower <steve.dower@python.org>
committer: zooba <steve.dower@microsoft.com>
date: 2024-04-17T19:32:47+01:00
summary:
gh-114539: Clarify implicit launching of shells by subprocess (GH-117996)
files:
M Doc/library/subprocess.rst
diff --git a/Doc/library/subprocess.rst b/Doc/library/subprocess.rst
index 49194b82b4cea2..1cd233173e85e1 100644
--- a/Doc/library/subprocess.rst
+++ b/Doc/library/subprocess.rst
@@ -754,8 +754,8 @@ 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
@@ -764,6 +764,14 @@ 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
-------------
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To unsubscribe send an email to python-checkins-leave@python.org
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Member address: list-python-checkins@lists.gossamer-threads.com