1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/stat.h> 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <fcntl.h> 33 #include <sys/varargs.h> 34 #include <errno.h> 35 #include <sys/mman.h> 36 #include <sys/wait.h> 37 #include <unistd.h> 38 39 #define DTRACEIOC (('d' << 24) | ('t' << 16) | ('r' << 8)) 40 #define DTRACEIOC_MAX 17 41 42 void 43 fatal(char *fmt, ...) 44 { 45 va_list ap; 46 47 va_start(ap, fmt); 48 49 fprintf(stderr, "%s: ", "badioctl"); 50 vfprintf(stderr, fmt, ap); 51 52 if (fmt[strlen(fmt) - 1] != '\n') 53 fprintf(stderr, ": %s\n", strerror(errno)); 54 55 exit(1); 56 } 57 58 void 59 badioctl(pid_t parent) 60 { 61 int fd = -1, random, ps = sysconf(_SC_PAGESIZE); 62 int i = 0, seconds; 63 caddr_t addr; 64 hrtime_t now, last = 0, end; 65 66 if ((random = open("/dev/random", O_RDONLY)) == -1) 67 fatal("couldn't open /dev/random"); 68 69 if ((addr = mmap(0, ps, PROT_READ | PROT_WRITE, 70 MAP_ANON | MAP_PRIVATE, -1, 0)) == (caddr_t)-1) 71 fatal("mmap"); 72 73 for (;;) { 74 unsigned int ioc; 75 76 if ((now = gethrtime()) - last > NANOSEC) { 77 if (kill(parent, 0) == -1 && errno == ESRCH) { 78 /* 79 * Our parent died. We will kill ourselves in 80 * sympathy. 81 */ 82 exit(0); 83 } 84 85 /* 86 * Once a second, we'll reopen the device. 87 */ 88 if (fd != -1) 89 close(fd); 90 91 fd = open("/devices/pseudo/dtrace@0:dtrace", O_RDONLY); 92 93 if (fd == -1) 94 fatal("couldn't open DTrace pseudo device"); 95 96 last = now; 97 } 98 99 100 if ((i++ % 1000) == 0) { 101 /* 102 * Every thousand iterations, change our random gunk. 103 */ 104 read(random, addr, ps); 105 } 106 107 read(random, &ioc, sizeof (ioc)); 108 ioc %= DTRACEIOC_MAX; 109 ioc++; 110 ioctl(fd, DTRACEIOC | ioc, addr); 111 } 112 } 113 114 void 115 main() 116 { 117 pid_t child, parent = getpid(); 118 int status; 119 120 for (;;) { 121 if ((child = fork()) == 0) 122 badioctl(parent); 123 124 while (waitpid(child, &status, WEXITED) != child) 125 continue; 126 127 if (WIFEXITED(status)) { 128 /* 129 * Our child exited by design -- we'll exit with 130 * the same status code. 131 */ 132 exit(WEXITSTATUS(status)); 133 } 134 135 /* 136 * Our child died on a signal. Respawn it. 137 */ 138 printf("badioctl: child died on signal %d; respawning.\n", 139 WTERMSIG(status)); 140 fflush(stdout); 141 } 142 } 143