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[3.6] bpo-30764: test_subprocess uses SuppressCrashReport (#2405) #2410

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Merged
vstinner merged 1 commit into from
Jun 26, 2017
Merged

[3.6] bpo-30764: test_subprocess uses SuppressCrashReport (#2405) #2410

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51 changes: 25 additions & 26 deletions Lib/test/test_subprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@
import ctypes
except ImportError:
ctypes = None
else:
import ctypes.util

try:
import threading
Expand Down Expand Up @@ -2565,43 +2567,40 @@ def test_communicate_BrokenPipeError_stdin_close_with_timeout(self):
proc.communicate(timeout=999)
mock_proc_stdin.close.assert_called_once_with()

_libc_file_extensions = {
'Linux': 'so.6',
'Darwin': 'dylib',
}
@unittest.skipIf(not ctypes, 'ctypes module required.')
@unittest.skipIf(platform.uname()[0] not in _libc_file_extensions,
'Test requires a libc this code can load with ctypes.')
@unittest.skipIf(not sys.executable, 'Test requires sys.executable.')
@unittest.skipIf(not ctypes, 'ctypes module required')
@unittest.skipIf(not sys.executable, 'Test requires sys.executable')
def test_child_terminated_in_stopped_state(self):
"""Test wait() behavior when waitpid returns WIFSTOPPED; issue29335."""
PTRACE_TRACEME = 0 # From glibc and MacOS (PT_TRACE_ME).
libc_name = 'libc.' + self._libc_file_extensions[platform.uname()[0]]
libc_name = ctypes.util.find_library('c')
libc = ctypes.CDLL(libc_name)
if not hasattr(libc, 'ptrace'):
raise unittest.SkipTest('ptrace() required.')
test_ptrace = subprocess.Popen(
[sys.executable, '-c', """if True:
import ctypes
libc = ctypes.CDLL({libc_name!r})
libc.ptrace({PTRACE_TRACEME}, 0, 0)
""".format(libc_name=libc_name, PTRACE_TRACEME=PTRACE_TRACEME)
])
if test_ptrace.wait() != 0:
raise unittest.SkipTest('ptrace() failed - unable to test.')
child = subprocess.Popen(
[sys.executable, '-c', """if True:
raise unittest.SkipTest('ptrace() required')

code = textwrap.dedent(f"""
import ctypes
import faulthandler
from test.support import SuppressCrashReport

libc = ctypes.CDLL({libc_name!r})
libc.ptrace({PTRACE_TRACEME}, 0, 0)
libc.printf(ctypes.c_char_p(0xdeadbeef)) # Crash the process.
""".format(libc_name=libc_name, PTRACE_TRACEME=PTRACE_TRACEME)
])
""")

child = subprocess.Popen([sys.executable, '-c', code])
if child.wait() != 0:
raise unittest.SkipTest('ptrace() failed - unable to test')

code += textwrap.dedent(f"""
with SuppressCrashReport():
# Crash the process
faulthandler._sigsegv()
""")
child = subprocess.Popen([sys.executable, '-c', code])
try:
returncode = child.wait()
except Exception as e:
except:
child.kill() # Clean up the hung stopped process.
raise e
raise
self.assertNotEqual(0, returncode)
self.assertLess(returncode, 0) # signal death, likely SIGSEGV.

Expand Down
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