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#!/bin/env python3
# crun - OCI runtime written in C
#
# Copyright (C) 2017, 2018, 2019 Giuseppe Scrivano <giuseppe@scrivano.org>
# crun is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# crun 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with crun. If not, see <http://www.gnu.org/licenses/>.
from tests_utils import *
def test_limit_pid_minus_1():
conf = base_config()
add_all_namespaces(conf)
if is_rootless():
return (77, "requires root privileges")
conf['process']['args'] = ['/init', 'cat', '/dev/null']
conf['linux']['resources'] = {"pids" : {"limit" : -1}}
try:
out, _ = run_and_get_output(conf, hide_stderr=True)
if len(out) == 0:
return 0
logger.info("PID limit -1 test failed: expected empty output")
logger.info("actual output length: %d", len(out))
logger.info("output: %s", out)
return -1
except Exception as e:
logger.info("PID limit -1 test failed with exception: %s", e)
return -1
def test_limit_pid_0():
conf = base_config()
add_all_namespaces(conf)
if is_rootless():
return (77, "requires root privileges")
conf['process']['args'] = ['/init', 'cat', '/dev/null']
conf['linux']['resources'] = {"pids" : {"limit" : 0}}
try:
out, _ = run_and_get_output(conf, hide_stderr=True)
if len(out) == 0:
return 0
logger.info("PID limit 0 test failed: expected empty output")
logger.info("actual output length: %d", len(out))
logger.info("output: %s", out)
return -1
except Exception as e:
logger.info("PID limit 0 test failed with exception: %s", e)
return -1
def test_limit_pid_n():
conf = base_config()
if is_rootless():
return (77, "requires root privileges")
add_all_namespaces(conf)
conf['process']['args'] = ['/init', 'forkbomb', '20']
pid_limit = 10
conf['linux']['resources'] = {"pids" : {"limit" : pid_limit}}
try:
out, _ = run_and_get_output(conf)
logger.info("PID limit %d test failed: expected fork bomb to be limited but command succeeded", pid_limit)
logger.info("output: %s", out)
return -1
except Exception as e:
error_output = ""
if hasattr(e, 'output') and e.output:
error_output = e.output.decode('utf-8', errors='ignore')
if "fork: Resource temporarily unavailable" in error_output:
return 0
logger.info("PID limit %d test failed: expected 'fork: Resource temporarily unavailable' error", pid_limit)
logger.info("actual error: %s", e.output)
if error_output:
logger.info("error output: %s", e.output)
return -1
all_tests = {
"limit-pid-minus-1" : test_limit_pid_minus_1,
"limit-pid-0" : test_limit_pid_0,
"limit-pid-n" : test_limit_pid_n,
}
if __name__ == "__main__":
tests_main(all_tests)
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