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gh-127081: lock non-re-entrant *pwent calls in free-threading (#132748)

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Duane Griffin 2025-05-22 22:22:02 +12:00 • committed by GitHub
parent 2602d8ae98
commit 458e33018a
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2 changed files with 22 additions and 5 deletions
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2
Misc/NEWS.d/next/Library/2025-04-21-00-58-04.gh-issue-127081.3DCl92.rst Normal file
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@ -0,0 +1,2 @@
Fix libc thread safety issues with :mod:`pwd` by locking access to
``getpwall``.

25
Modules/pwdmodule.c
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@ -301,18 +301,33 @@ pwd_getpwall_impl(PyObject *module)
struct passwd *p;
if ((d = PyList_New(0)) == NULL)
return NULL;
#ifdef Py_GIL_DISABLED
static PyMutex getpwall_mutex = {0};
PyMutex_Lock(&getpwall_mutex);
#endif
int failure = 0;
PyObject *v = NULL;
setpwent();
while ((p = getpwent()) != NULL) {
PyObject *v = mkpwent(module, p);
v = mkpwent(module, p);
if (v == NULL || PyList_Append(d, v) != 0) {
Py_XDECREF(v);
Py_DECREF(d);
endpwent();
return NULL;
/* NOTE: cannot dec-ref here, while holding the mutex. */
failure = 1;
goto done;
}
Py_DECREF(v);
}
done:
endpwent();
#ifdef Py_GIL_DISABLED
PyMutex_Unlock(&getpwall_mutex);
#endif
if (failure) {
Py_XDECREF(v);
Py_CLEAR(d);
}
return d;
}
#endif