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GH-88968: Reject socket that is already used as a transport #98010

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Merged
merged 4 commits into from
Oct 7, 2022
Merged

GH-88968: Reject socket that is already used as a transport #98010

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6783dda
In _make_socket_transport, ensure the fd isn't already used by a tran…
gvanrossum Oct 7, 2022
fda2111
Make existing tests pass
gvanrossum Oct 7, 2022
6224b18
Test that _ensure_fd_no_transport is called
gvanrossum Oct 7, 2022
1c348f1
Same check for _make_ssl_transport and _make_datagram_transport
gvanrossum Oct 7, 2022
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3 changes: 3 additions & 0 deletions Lib/asyncio/selector_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -58,6 +58,7 @@ def __init__(self, selector=None):

def _make_socket_transport(self, sock, protocol, waiter=None, *,
extra=None, server=None):
self._ensure_fd_no_transport(sock)
return _SelectorSocketTransport(self, sock, protocol, waiter,
extra, server)

Expand All @@ -68,6 +69,7 @@ def _make_ssl_transport(
ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT,
ssl_shutdown_timeout=constants.SSL_SHUTDOWN_TIMEOUT,
):
self._ensure_fd_no_transport(rawsock)
ssl_protocol = sslproto.SSLProtocol(
self, protocol, sslcontext, waiter,
server_side, server_hostname,
Expand All @@ -80,6 +82,7 @@ def _make_ssl_transport(

def _make_datagram_transport(self, sock, protocol,
address=None, waiter=None, extra=None):
self._ensure_fd_no_transport(sock)
return _SelectorDatagramTransport(self, sock, protocol,
address, waiter, extra)

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4 changes: 4 additions & 0 deletions Lib/test/test_asyncio/test_selector_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -61,8 +61,10 @@ def setUp(self):
def test_make_socket_transport(self):
m = mock.Mock()
self.loop.add_reader = mock.Mock()
self.loop._ensure_fd_no_transport = mock.Mock()
transport = self.loop._make_socket_transport(m, asyncio.Protocol())
self.assertIsInstance(transport, _SelectorSocketTransport)
self.assertEqual(self.loop._ensure_fd_no_transport.call_count, 1)

# Calling repr() must not fail when the event loop is closed
self.loop.close()
Expand All @@ -78,8 +80,10 @@ def test_make_ssl_transport_without_ssl_error(self):
self.loop.add_writer = mock.Mock()
self.loop.remove_reader = mock.Mock()
self.loop.remove_writer = mock.Mock()
self.loop._ensure_fd_no_transport = mock.Mock()
with self.assertRaises(RuntimeError):
self.loop._make_ssl_transport(m, m, m, m)
self.assertEqual(self.loop._ensure_fd_no_transport.call_count, 1)

def test_close(self):
class EventLoop(BaseSelectorEventLoop):
Expand Down