1#!/bin/sh 2 3# 4# Copyright (c) 2014 EMC Corp. 5# All rights reserved. 6# 7# Redistribution and use in source and binary forms, with or without 8# modification, are permitted provided that the following conditions 9# are met: 10# 1. Redistributions of source code must retain the above copyright 11# notice, this list of conditions and the following disclaimer. 12# 2. Redistributions in binary form must reproduce the above copyright 13# notice, this list of conditions and the following disclaimer in the 14# documentation and/or other materials provided with the distribution. 15# 16# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26# SUCH DAMAGE. 27# 28 29# A regression test for a bug introduced in r269656. 30# Page fault in proc_realparent+0x70 seen. 31# Fixed in r270024. 32 33# Test scenario by Mark Johnston markj@ 34 35. ../default.cfg 36 37here=`pwd` 38cd /tmp 39sed '1,/^EOF/d' < $here/$0 > ptrace3.c 40mycc -o ptrace3 -Wall -Wextra -g ptrace3.c || exit 1 41rm -f ptrace3.c 42cd $here 43 44/tmp/ptrace3 45 46rm -f /tmp/ptrace3 47exit 48EOF 49#include <sys/types.h> 50#include <sys/ptrace.h> 51#include <sys/wait.h> 52 53#include <err.h> 54#include <signal.h> 55#include <unistd.h> 56 57/* 58 * A regression test for a bug introduced in r269656. The test process p creates 59 * child processes c1 and c2 which do nothing but sleep; a third child process 60 * (c3) uses ptrace(2) to reparent c1 and c2 from p to c3. Then c3 detaches from 61 * c1 and c2, causing a crash when c1 and c2 are removed from p's now-corrupt 62 * orphan list. 63 */ 64 65pid_t 66sleeper() 67{ 68 pid_t p; 69 70 p = fork(); 71 if (p == -1) 72 err(1, "fork"); 73 else if (p == 0) 74 while (1) 75 sleep(1000000); 76 return (p); 77} 78 79void 80attach(pid_t p) 81{ 82 int status; 83 84 if (ptrace(PT_ATTACH, p, 0, 0) == -1) 85 err(1, "ptrace"); 86 87 if (waitpid(p, &status, 0) == -1) 88 err(1, "waitpid"); 89 else if (!WIFSTOPPED(status)) 90 errx(1, "failed to stop child"); 91} 92 93void 94detach(pid_t p) 95{ 96 97 if (ptrace(PT_DETACH, p, 0, 0) == -1) 98 err(1, "ptrace"); 99} 100 101int 102main(void) 103{ 104 int status; 105 pid_t c1, c2, p; 106 107 c1 = sleeper(); 108 c2 = sleeper(); 109 110 p = fork(); 111 if (p == -1) { 112 err(1, "fork"); 113 } else if (p == 0) { 114 attach(c1); 115 attach(c2); 116 detach(c1); 117 detach(c2); 118 } else { 119 if (waitpid(p, &status, 0) == -1) 120 err(1, "waitpid"); 121 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) 122 errx(1, "child exited abnormally"); 123 } 124 125 /* Clean up. */ 126 (void)kill(c1, SIGKILL); 127 (void)kill(c2, SIGKILL); 128 129 return (0); 130} 131