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Close #13022: _multiprocessing.recvfd() doesn't check that file descriptor was actually received

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Jesus Cea 2011-09-21 03:56:05 +02:00
commit 41c98a3207
3 changed files with 31 additions and 0 deletions
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11
Modules/_multiprocessing/multiprocessing.c
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@ -166,6 +166,17 @@ multiprocessing_recvfd(PyObject *self, PyObject *args)
if (res < 0)
return PyErr_SetFromErrno(PyExc_OSError);
if (msg.msg_controllen < CMSG_LEN(sizeof(int)) ||
(cmsg = CMSG_FIRSTHDR(&msg)) == NULL ||
cmsg->cmsg_level != SOL_SOCKET ||
cmsg->cmsg_type != SCM_RIGHTS ||
cmsg->cmsg_len < CMSG_LEN(sizeof(int))) {
/* If at least one control message is present, there should be
no room for any further data in the buffer. */
PyErr_SetString(PyExc_RuntimeError, "No file descriptor received");
return NULL;
}
fd = * (int *) CMSG_DATA(cmsg);
return Py_BuildValue("i", fd);
}