18a272653SPeter Holm#!/bin/sh 28a272653SPeter Holm 38a272653SPeter Holm# 44d846d26SWarner Losh# SPDX-License-Identifier: BSD-2-Clause 58a272653SPeter Holm# 68a272653SPeter Holm# Copyright (c) 2021 Mark Johnston <markj@FreeBSD.org> 78a272653SPeter Holm# 88a272653SPeter Holm# Redistribution and use in source and binary forms, with or without 98a272653SPeter Holm# modification, are permitted provided that the following conditions 108a272653SPeter Holm# are met: 118a272653SPeter Holm# 1. Redistributions of source code must retain the above copyright 128a272653SPeter Holm# notice, this list of conditions and the following disclaimer. 138a272653SPeter Holm# 2. Redistributions in binary form must reproduce the above copyright 148a272653SPeter Holm# notice, this list of conditions and the following disclaimer in the 158a272653SPeter Holm# documentation and/or other materials provided with the distribution. 168a272653SPeter Holm# 178a272653SPeter Holm# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 188a272653SPeter Holm# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 198a272653SPeter Holm# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 208a272653SPeter Holm# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 218a272653SPeter Holm# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 228a272653SPeter Holm# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 238a272653SPeter Holm# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 248a272653SPeter Holm# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 258a272653SPeter Holm# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 268a272653SPeter Holm# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 278a272653SPeter Holm# SUCH DAMAGE. 288a272653SPeter Holm# 298a272653SPeter Holm 308a272653SPeter Holm# ptrace(2) test scenario by Mark Johnston 318a272653SPeter Holm# https://people.freebsd.org/~markj/ptrace_stop_mt.c 328a272653SPeter Holm# Fixed by r303423. 338a272653SPeter Holm 348a272653SPeter Holm# stopped on signal 17 after detach 358a272653SPeter Holm# UID PID PPID CPU PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND 368a272653SPeter Holm# 1001 47125 62778 0 52 0 6568 2456 wait S+ 2 0:00.01 /bin/sh ./ptrace10.sh 378a272653SPeter Holm# 1001 47146 47125 0 23 0 6108 1928 nanslp S+ 2 0:00.00 ./ptrace10 388a272653SPeter Holm# 1001 47148 47146 0 24 0 6240 1932 - T+ 2 0:00.00 ./ptrace10 398a272653SPeter Holm# 1001 47148 47146 0 24 0 6240 1932 - T+ 2 0:00.00 ./ptrace10 408a272653SPeter Holm 418a272653SPeter Holm. ../default.cfg 428a272653SPeter Holm 438a272653SPeter Holmcd /tmp 448a272653SPeter Holmcat > ptrace10.c <<EOF 458a272653SPeter Holm#include <sys/types.h> 468a272653SPeter Holm#include <sys/ptrace.h> 478a272653SPeter Holm#include <sys/wait.h> 488a272653SPeter Holm 498a272653SPeter Holm#include <err.h> 508a272653SPeter Holm#include <pthread.h> 518a272653SPeter Holm#include <signal.h> 528a272653SPeter Holm#include <stdio.h> 538a272653SPeter Holm#include <stdlib.h> 548a272653SPeter Holm#include <unistd.h> 558a272653SPeter Holm 568a272653SPeter Holmstatic void 578a272653SPeter Holmsighup(int sig __unused) 588a272653SPeter Holm{ 598a272653SPeter Holm} 608a272653SPeter Holm 618a272653SPeter Holmstatic void 628a272653SPeter Holmsleep_forever(void) 638a272653SPeter Holm{ 648a272653SPeter Holm 658a272653SPeter Holm while (1) 668a272653SPeter Holm sleep(1); 678a272653SPeter Holm} 688a272653SPeter Holm 698a272653SPeter Holmstatic void * 708a272653SPeter Holmthread(void *arg __unused) 718a272653SPeter Holm{ 728a272653SPeter Holm 738a272653SPeter Holm sleep_forever(); 748a272653SPeter Holm return (NULL); 758a272653SPeter Holm} 768a272653SPeter Holm 778a272653SPeter Holmint 788a272653SPeter Holmmain(void) 798a272653SPeter Holm{ 808a272653SPeter Holm struct sigaction act; 818a272653SPeter Holm sigset_t set; 828a272653SPeter Holm pthread_t t; 838a272653SPeter Holm pid_t pid, ret; 848a272653SPeter Holm int e, try, limit, r, status; 858a272653SPeter Holm 868a272653SPeter Holm e = 0; 878a272653SPeter Holm pid = fork(); 888a272653SPeter Holm if (pid < 0) 898a272653SPeter Holm err(1, "fork"); 908a272653SPeter Holm if (pid == 0) { 918a272653SPeter Holm act.sa_handler = sighup; 928a272653SPeter Holm act.sa_flags = 0; 938a272653SPeter Holm sigemptyset(&act.sa_mask); 948a272653SPeter Holm if (sigaction(SIGHUP, &act, NULL) != 0) 958a272653SPeter Holm err(1, "sigaction"); 968a272653SPeter Holm 978a272653SPeter Holm r = pthread_create(&t, NULL, thread, NULL); 988a272653SPeter Holm if (r != 0) 998a272653SPeter Holm errc(1, r, "pthread_create"); 1008a272653SPeter Holm 1018a272653SPeter Holm /* Force SIGHUP to be delivered to the new thread. */ 1028a272653SPeter Holm sigemptyset(&set); 1038a272653SPeter Holm sigaddset(&set, SIGHUP); 1048a272653SPeter Holm r = pthread_sigmask(SIG_BLOCK, &set, NULL); 1058a272653SPeter Holm if (r != 0) 1068a272653SPeter Holm errc(1, r, "pthread_sigmask"); 1078a272653SPeter Holm 1088a272653SPeter Holm sleep_forever(); 1098a272653SPeter Holm } else { 1108a272653SPeter Holm sleep(1); /* give the child a chance to set itself up */ 1118a272653SPeter Holm 1128a272653SPeter Holm limit = 100; 1138a272653SPeter Holm for (try = 1; try <= limit; try++) { 1148a272653SPeter Holm if (kill(pid, SIGHUP) != 0) 1158a272653SPeter Holm err(1, "kill(SIGHUP)"); 1168a272653SPeter Holm if (ptrace(PT_ATTACH, pid, NULL, 0) != 0) 1178a272653SPeter Holm err(1, "ptrace(PT_ATTACH)"); 1188a272653SPeter Holm if (waitpid(pid, &status, WUNTRACED) != pid) 1198a272653SPeter Holm err(1, "waitpid 1"); 1208a272653SPeter Holm if (!WIFSTOPPED(status)) 1218a272653SPeter Holm errx(1, "unexpected status %d after PT_ATTACH", 1228a272653SPeter Holm status); 1238a272653SPeter Holm if (ptrace(PT_DETACH, pid, NULL, 0) != 0) 1248a272653SPeter Holm err(1, "ptrace(PT_DETACH)"); 1258a272653SPeter Holm 1268a272653SPeter Holm sleep(1); 1278a272653SPeter Holm ret = waitpid(pid, &status, WUNTRACED | WNOHANG); 1288a272653SPeter Holm if (ret < 0) 1298a272653SPeter Holm err(1, "waitpid"); 1308a272653SPeter Holm if (ret == 0) 1318a272653SPeter Holm continue; 1328a272653SPeter Holm if (!WIFSTOPPED(status)) 1338a272653SPeter Holm errx(1, "unexpected status %d after PT_DETACH", 1348a272653SPeter Holm status); 1358a272653SPeter Holm printf("stopped on signal %d after detach\n", 1368a272653SPeter Holm WSTOPSIG(status)); 1378a272653SPeter Holm e = 1; 1388a272653SPeter Holm break; 1398a272653SPeter Holm } 1408a272653SPeter Holm } 1418a272653SPeter Holm kill(pid, SIGINT); 1428a272653SPeter Holm 1438a272653SPeter Holm return (e); 1448a272653SPeter Holm} 1458a272653SPeter HolmEOF 1468a272653SPeter Holm 1478a272653SPeter Holmmycc -o ptrace10 -Wall -Wextra -O2 -g ptrace10.c -lpthread || exit 1 1488a272653SPeter Holmrm ptrace10.c 1498a272653SPeter Holm 1508a272653SPeter Holm./ptrace10 1518a272653SPeter Holms=$? 1528a272653SPeter Holmif [ $s -ne 0 ]; then 1538a272653SPeter Holm ps -lxH | grep -v grep | egrep "UID|ptrace10" 1548a272653SPeter Holm while pgrep -q ptrace10; do 1558a272653SPeter Holm pkill -9 ptrace10 1568a272653SPeter Holm done 1578a272653SPeter Holmfi 1588a272653SPeter Holmwait 1598a272653SPeter Holm 1608a272653SPeter Holmrm -f ptrace10 1618a272653SPeter Holmexit $s 162