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gh-98610: Adjust the Optional Restrictions on Subinterpreters (GH-98618)

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Previously, the optional restrictions on subinterpreters were: disallow fork, subprocess, and threads.  By default, we were disallowing all three for "isolated" interpreters.  We always allowed all three for the main interpreter and those created through the legacy `Py_NewInterpreter()` API.

Those settings were a bit conservative, so here we've adjusted the optional restrictions to: fork, exec, threads, and daemon threads.  The default for "isolated" interpreters disables fork, exec, and daemon threads.  Regular threads are allowed by default.  We continue always allowing everything For the main interpreter and the legacy API.

In the code, we add `_PyInterpreterConfig.allow_exec` and  `_PyInterpreterConfig.allow_daemon_threads`.  We also add `Py_RTFLAGS_DAEMON_THREADS` and `Py_RTFLAGS_EXEC`.
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Eric Snow 2022-10-31 13:35:54 -06:00 • committed by GitHub
parent 3b86538661
commit 4702552885
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15 changed files with 220 additions and 47 deletions
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10
Python/pylifecycle.c
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@ -615,15 +615,21 @@ static void
init_interp_settings(PyInterpreterState *interp, const _PyInterpreterConfig *config)
{
assert(interp->feature_flags == 0);
if (config->allow_fork) {
interp->feature_flags |= Py_RTFLAGS_FORK;
}
if (config->allow_subprocess) {
interp->feature_flags |= Py_RTFLAGS_SUBPROCESS;
if (config->allow_exec) {
interp->feature_flags |= Py_RTFLAGS_EXEC;
}
// Note that fork+exec is always allowed.
if (config->allow_threads) {
interp->feature_flags |= Py_RTFLAGS_THREADS;
}
if (config->allow_daemon_threads) {
interp->feature_flags |= Py_RTFLAGS_DAEMON_THREADS;
}
}