From cb9424f6435cf02ba913d0263d69524bcc294095 Mon Sep 17 00:00:00 2001 From: Yury Selivanov Date: Thu, 6 Oct 2016 14:03:03 -0400 Subject: Issue #27759: Fix selectors incorrectly retain invalid file descriptors. (Backported to 3.4 as this bug might be exploited to for DoS) --- Lib/selectors.py | 26 +++++++++++++++++--------- Lib/test/test_selectors.py | 23 +++++++++++++++++++++++ Misc/NEWS | 3 +++ 3 files changed, 43 insertions(+), 9 deletions(-) diff --git a/Lib/selectors.py b/Lib/selectors.py index 7b6da29..8936ab6 100644 --- a/Lib/selectors.py +++ b/Lib/selectors.py @@ -399,7 +399,11 @@ if hasattr(select, 'epoll'): epoll_events |= select.EPOLLIN if events & EVENT_WRITE: epoll_events |= select.EPOLLOUT - self._epoll.register(key.fd, epoll_events) + try: + self._epoll.register(key.fd, epoll_events) + except BaseException: + super().unregister(fileobj) + raise return key def unregister(self, fileobj): @@ -465,14 +469,18 @@ if hasattr(select, 'kqueue'): def register(self, fileobj, events, data=None): key = super().register(fileobj, events, data) - if events & EVENT_READ: - kev = select.kevent(key.fd, select.KQ_FILTER_READ, - select.KQ_EV_ADD) - self._kqueue.control([kev], 0, 0) - if events & EVENT_WRITE: - kev = select.kevent(key.fd, select.KQ_FILTER_WRITE, - select.KQ_EV_ADD) - self._kqueue.control([kev], 0, 0) + try: + if events & EVENT_READ: + kev = select.kevent(key.fd, select.KQ_FILTER_READ, + select.KQ_EV_ADD) + self._kqueue.control([kev], 0, 0) + if events & EVENT_WRITE: + kev = select.kevent(key.fd, select.KQ_FILTER_WRITE, + select.KQ_EV_ADD) + self._kqueue.control([kev], 0, 0) + except BaseException: + super().unregister(fileobj) + raise return key def unregister(self, fileobj): diff --git a/Lib/test/test_selectors.py b/Lib/test/test_selectors.py index 952fda6..28cd948 100644 --- a/Lib/test/test_selectors.py +++ b/Lib/test/test_selectors.py @@ -5,6 +5,7 @@ import selectors import signal import socket import sys +import tempfile from test import support from time import sleep import unittest @@ -447,6 +448,16 @@ class EpollSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn): SELECTOR = getattr(selectors, 'EpollSelector', None) + def test_register_file(self): + # epoll(7) returns EPERM when given a file to watch + s = self.SELECTOR() + with tempfile.NamedTemporaryFile() as f: + with self.assertRaises(IOError): + s.register(f, selectors.EVENT_READ) + # the SelectorKey has been removed + with self.assertRaises(KeyError): + s.get_key(f) + @unittest.skipUnless(hasattr(selectors, 'KqueueSelector'), "Test needs selectors.KqueueSelector)") @@ -454,6 +465,18 @@ class KqueueSelectorTestCase(BaseSelectorTestCase, ScalableSelectorMixIn): SELECTOR = getattr(selectors, 'KqueueSelector', None) + def test_register_bad_fd(self): + # a file descriptor that's been closed should raise an OSError + # with EBADF + s = self.SELECTOR() + bad_f = support.make_bad_fd() + with self.assertRaises(OSError) as cm: + s.register(bad_f, selectors.EVENT_READ) + self.assertEqual(cm.exception.errno, errno.EBADF) + # the SelectorKey has been removed + with self.assertRaises(KeyError): + s.get_key(bad_f) + def test_main(): tests = [DefaultSelectorTestCase, SelectSelectorTestCase, diff --git a/Misc/NEWS b/Misc/NEWS index aad29d9..6aeb2ec 100644 --- a/Misc/NEWS +++ b/Misc/NEWS @@ -29,6 +29,9 @@ Library HTTP_PROXY variable when REQUEST_METHOD environment is set, which indicates that the script is in CGI mode. +- Issue #27759: Fix selectors incorrectly retain invalid file descriptors. + Patch by Mark Williams. + Tests ----- -- cgit v0.12 ug_2945130fff_shift Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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