8000 gh-94518: [_posixsubprocess] Replace variable validity flags with reserved values by arhadthedev · Pull Request #94687 · python/cpython · GitHub
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gh-94518: [_posixsubprocess] Replace variable validity flags with reserved values #94687

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Merged
merged 14 commits into from
Jan 14, 2023
Merged

gh-94518: [_posixsubprocess] Replace variable validity flags with reserved values #94687

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1b3250e
Replace call_setgid/call_setuid in _posixsubprocess with gid/uid==-1
arhadthedev Jul 8, 2022
c292331
Merge branch 'main' into posixsubprocess-no-callsetxid
arhadthedev Jul 22, 2022
7d431a3
Add a NEWS entry
arhadthedev Jul 22, 2022
06f2a01
Address Gregory's review in gh-94519
arhadthedev Jul 26, 2022
aaec16e
Use negative groups_size for "don't call setgroups"
arhadthedev Jul 27, 2022
c9bf4f6
Check num_groups for emptiness, not groups_list
arhadthedev Jul 27, 2022
069d769
Restore assertions in do_fork_exec()
arhadthedev Jul 27, 2022
6a236e5
Tighten scope of relevant short lived variables
arhadthedev Jul 27, 2022
8c06be1
Fix `PermissionError: [Errno 1] Operation not permitted` exception
arhadthedev Jul 27, 2022
3ccdb78
Merge branch 'main' into posixsubprocess-no-callsetxid
arhadthedev Oct 6, 2022
d3c0e6c
Merge branch 'main' into posixsubprocess-no-callsetxid
arhadthedev Oct 29, 2022
cfdf639
Merge branch 'main' into posixsubprocess-no-callsetxid
arhadthedev Nov 14, 2022
0e997c0
Merge branch 'main' into posixsubprocess-no-callsetxid
arhadthedev Nov 29, 2022
66c836b
Merge branch 'main' into posixsubprocess-no-callsetxid
arhadthedev Jan 14, 2023
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Check num_groups for emptiness, not groups_list 
`num_groups < 0` already implies `groups_list == Py_None` because
`num_groups = PySequence_Size(groups_list)` does this check for us.

Also, it guarantees that `groups_list == Py_None` <=> `groups == NULL`;
it allows to replace `groups_list != Py_None ? groups : NULL` with just
`groups` in a call of `do_fork_exec()`.
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@arhadthedev
arhadthedev committed Jul 27, 2022
commit c9bf4f64f74a7ff266b5db8df7d899fba3ba87e7
4 changes: 2 additions & 2 deletions Modules/_posixsubprocess.c
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Original file line number Diff line number Diff line change
Expand Up @@ -998,7 +998,7 @@ subprocess_fork_exec(PyObject *module, PyObject *args)
/* Use vfork() only if it's safe. See the comment above child_exec(). */
sigset_t old_sigs;
if (preexec_fn == Py_None && allow_vfork &&
uid == (uid_t)-1 && gid == (gid_t)-1 && groups_list == Py_None) {
uid == (uid_t)-1 && gid == (gid_t)-1 && num_groups < 0) {
/* Block all signals to ensure that no signal handlers are run in the
* child process while it shares memory with us. Note that signals
* used internally by C libraries won't be blocked by
Expand All @@ -1021,7 +1021,7 @@ subprocess_fork_exec(PyObject *module, PyObject *args)
p2cread, p2cwrite, c2pread, c2pwrite,
errread, errwrite, errpipe_read, errpipe_write,
close_fds, restore_signals, call_setsid, pgid_to_set,
gid, num_groups, groups_list != Py_None ? groups : NULL,
gid, num_groups, groups,
uid, child_umask, old_sigmask,
py_fds_to_keep, preexec_fn, preexec_fn_args_tuple);

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