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#!/usr/bin/env python3
# libpulp - User-space Livepatching Library
#
# Copyright (C) 2020-2021 SUSE Software Solutions GmbH
#
# This file is part of libpulp.
#
# libpulp is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# libpulp is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with libpulp. If not, see <http://www.gnu.org/licenses/>.
import signal
import subprocess
import testsuite
child = testsuite.spawn('asunsafe_conversion')
child.expect('Waiting for signals.')
child.kill(signal.SIGUSR1)
child.expect('hello')
errors = 0
try:
# Apply the live patch.
child.livepatch('.libs/libblocked_livepatch1.so', retries=2000)
except subprocess.TimeoutExpired:
print('Deadlock while live patching - AS-Unsafe conversion not tested')
# The deadlock test (tests/deadlock) has a far greater chance of
# detecting deadlocks during the application of live-patches, so
# return 77 to report that this test case was unable to detect the
# AS-Unsafe conversion.
errors = 77
except subprocess.CalledProcessError as err:
# The trigger tool may fail to apply a live patch when the locks it
# needs to acquire from glibc are busy. This is expected to happen
# some times, but not the intent of this test case, so return 77 to
# report that the AS-Unsafe conversion was not properly detected.
if err.returncode == 1:
print('Unable to live patch - AS-Unsafe conversion not tested')
errors = 77
# On the other hand, if the trigger tool fails for some unexpected
# reason, signal it as a hard error (99) to the test harness.
else:
print('Unexpected failure while live patching')
errors = 99
else:
# Send signals to the process which will cause the live-patched
# function to be called from the context of a signal-handler. If the
# live-patched function became AS-Unsafe, it might deadlock. Since it
# is not guaranteed to deadlock every time, loop it an arbitrarily
# chosen number of times.
for attempt in range(1000):
child.kill(signal.SIGUSR1)
try:
child.expect('olleh')
except TimeoutError:
print('AS-Unsafe conversion detected')
errors = 1
break
child.close(force=True)
exit(errors)
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