Miss Islington (bot) 85bbfa8a4b
[3.12] gh-112334: Restore subprocess's use of vfork() & fix extra_groups=[] behavior (GH-112617) ( #112731 ) ...
Restore `subprocess`'s intended use of `vfork()` by default for performance on Linux;
also fixes the behavior of `extra_groups=[]` which was unintentionally broken in 3.12.0:
Fixed a performance regression in 3.12's :mod:`subprocess` on Linux where it
would no longer use the fast-path ``vfork()`` system call when it could have
due to a logic bug, instead falling back to the safe but slower ``fork()``.
Also fixed a security bug introduced in 3.12.0. If a value of ``extra_groups=[]``
was passed to :mod:`subprocess.Popen` or related APIs, the underlying
``setgroups(0, NULL)`` system call to clear the groups list would not be made
in the child process prior to ``exec()``.
The security issue was identified via code inspection in the process of
fixing the first bug. Thanks to @vain for the detailed report and
analysis in the initial bug on Github.
(cherry picked from commit 9fe7655c6cgreg@krypto.org >
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com >
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Miss Islington (bot)
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