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|
#!/bin/sh
#
# Check that PTRACE_O_EXITKILL is set properly.
#
# Copyright (c) 2023 Dmitry V. Levin <ldv@strace.io>
# All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0-or-later
max_wait_attempts=100
$STRACE -d -f $kill_on_exit_option -e trace=fchdir / > /dev/null 2> "$LOG" ||:
if grep -x "[^:]*strace: PTRACE_O_EXITKILL does not work" "$LOG" > /dev/null; then
skip_ 'PTRACE_O_EXITKILL does not work'
fi
grep -x "[^:]*strace: PTRACE_O_EXITKILL works" "$LOG" > /dev/null ||
fail_ 'PTRACE_O_EXITKILL marker not found'
check_prog sed
run_prog_skip_if_failed \
kill -0 $$
cat >script <<EOF
#!/bin/sh -efu
trap '' TERM
echo ONE
# Do not wait forever, stop waiting after a few iterations.
attempt=0
while [ "\$attempt" -lt "$max_wait_attempts" ] && [ ! -s 'killed' ]; do
$SLEEP_A_BIT
attempt=\$((attempt + 1))
done
[ -s 'killed' ] || {
echo TIMEOUT
exit 1
}
echo TWO
EOF
chmod +x script
run_tracer()
{
local attempt expected_rc tracee_pid tracer_pid rc=0
expected_rc="$1"; shift
> "$OUT"
> killed
$STRACE -d -D -I2 -f -e/exit "$@" ./script > "$OUT" 2> "$LOG" &
tracee_pid=$!
# Do not wait forever, stop waiting after a few iterations.
attempt=0
while [ "$attempt" -lt "$max_wait_attempts" ] && [ ! -s "$OUT" ]; do
$SLEEP_A_BIT
attempt=$((attempt + 1))
done
[ -s "$OUT" ] ||
fail_ 'timeout waiting for the script output'
tracer_pid=$(sed -n 's/^[^:]*strace: new tracer pid is \([[:digit:]]\+\)$/\1/p' "$LOG")
[ -n "$tracer_pid" ] || {
kill -9 $tracee_pid
fail_ 'tracer pid not found'
}
kill $tracer_pid
# Do not wait forever, stop waiting after a few iterations.
attempt=0
while [ "$attempt" -lt "$max_wait_attempts" ] && kill -0 "$tracer_pid" 2> /dev/null; do
$SLEEP_A_BIT
attempt=$((attempt + 1))
done
[ "$attempt" -lt "$max_wait_attempts" ] ||
fail_ 'timeout waiting for the tracer to terminate'
echo > killed
wait $tracee_pid ||
rc=$?
[ "$rc" = "$expected_rc" ] ||
fail_ "expected rc $expected_rc, got rc $rc"
match_diff "$OUT" "$EXP"
}
# first time without $kill_on_exit_option
{
echo ONE
echo TWO
} > "$EXP"
run_tracer 0
# second time with $kill_on_exit_option
echo ONE > "$EXP"
run_tracer 137 $kill_on_exit_option
|
