1 /* $NetBSD: t_ptrace_kill.c,v 1.1 2024/12/17 17:52:23 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2024 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __RCSID("$NetBSD: t_ptrace_kill.c,v 1.1 2024/12/17 17:52:23 christos Exp $"); 34 35 #include <sys/types.h> 36 #include <sys/ptrace.h> 37 #include <sys/wait.h> 38 #include <pthread.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <signal.h> 43 #include <unistd.h> 44 #include <errno.h> 45 #include <err.h> 46 #include <atf-c.h> 47 48 #define SYSCALL(a, b) ATF_REQUIRE_EQ_MSG(a, b, "%s got %s", #a, strerror(errno)) 49 50 ATF_TC(pt_kill); 51 ATF_TC_HEAD(pt_kill, tc) 52 { 53 atf_tc_set_md_var(tc, "descr", "Test PT_KILL of a PT_STOP'ed process"); 54 } 55 56 static void 57 child(int *fdto, int *fdfrom) 58 { 59 char p = '2', q; 60 printf("%d: born\n", getpid()); 61 write(fdfrom[1], &p, 1); 62 read(fdto[0], &q, 1); 63 printf("%d: seppuku %c\n", getpid(), q); 64 write(fdfrom[1], &p, 1); 65 read(fdto[0], &q, 1); 66 // *(int *)1 = 0; 67 // kill(getpid(), SIGSEGV); 68 // kill(getpid(), SIGSTOP); 69 for (;;) 70 sleep(1); 71 72 } 73 74 static void * 75 waitthread(void *pidp) 76 { 77 int status = 0; 78 pid_t rpid, pid; 79 80 pid = *(pid_t *)pidp; 81 printf("waiting for %d\n", pid); 82 while ((rpid = waitpid(pid, &status, 0)) != pid) { 83 printf("waitpid %d = %d status = %#x", pid, rpid, status); 84 } 85 printf("done waitpid %d = %d status = %#x", pid, rpid, status); 86 return NULL; 87 } 88 89 ATF_TC_BODY(pt_kill, tc) 90 { 91 pid_t pid; 92 int fdto[2], fdfrom[2]; 93 char p = '1', q; 94 int status; 95 pthread_t thread; 96 97 SYSCALL(pipe(fdto), 0); 98 SYSCALL(pipe(fdfrom), 0); 99 switch (pid = fork()) { 100 case 0: 101 child(fdto, fdfrom); 102 break; 103 case -1: 104 err(EXIT_FAILURE, "fork failed"); 105 default: 106 SYSCALL(pthread_create(&thread, NULL, waitthread, &pid), 0); 107 sleep(1); // XXX: too lazy to sync properly 108 SYSCALL(read(fdfrom[0], &q, 1), 1); 109 printf("%d: read %c\n", pid, q); 110 SYSCALL(ptrace(PT_ATTACH, pid, NULL, 0), 0); 111 printf("%d: attached\n", pid); 112 SYSCALL(write(fdto[1], &p, 1), 1); 113 waitpid(pid, NULL, WNOHANG); 114 printf("%d: sent\n", pid); 115 SYSCALL(ptrace(PT_CONTINUE, pid, (void *)1, 0), 0); 116 SYSCALL(read(fdfrom[0], &p, 1), 1); 117 printf("%d: received\n", pid); 118 SYSCALL(ptrace(PT_STOP, pid, NULL, 0), 0); 119 SYSCALL(ptrace(PT_KILL, pid, NULL, 0), 0); 120 SYSCALL(waitpid(pid, &status, 0), pid); 121 ATF_REQUIRE(status == 9); 122 break; 123 } 124 } 125 126 ATF_TP_ADD_TCS(tp) 127 { 128 ATF_TP_ADD_TC(tp, pt_kill); 129 130 return atf_no_error(); 131 } 132