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[3.10] gh-94632: document the subprocess need for extra_groups=() with user= (GH-148129) #148134

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pablogsal merged 1 commit into from
Apr 5, 2026
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[3.10] gh-94632: document the subprocess need for extra_groups=() with user= (GH-148129) #148134

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6 changes: 6 additions & 0 deletions Doc/library/subprocess.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -618,6 +618,12 @@ functions.
the value in ``pw_uid`` will be used. If the value is an integer, it will
be passed verbatim. (POSIX only)

.. note::

Specifying *user* will not drop existing supplementary group memberships!
The caller must also pass ``extra_groups=()`` to reduce the group membership
of the child process for security purposes.

.. availability:: POSIX
.. versionadded:: 3.9

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