1 /* 2 * Copyright (c) Wipro Technologies Ltd, 2002. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * You should have received a copy of the GNU General Public License along 13 * with this program; if not, write the Free Software Foundation, Inc., 14 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 15 * 16 */ 17 /********************************************************** 18 * 19 * TEST IDENTIFIER : ptrace02 20 * 21 * EXECUTED BY : anyone 22 * 23 * TEST TITLE : functionality test for ptrace(2) 24 * 25 * TEST CASE TOTAL : 2 26 * 27 * AUTHOR : Saji Kumar.V.R <saji.kumar (at) wipro.com> 28 * 29 * SIGNALS 30 * Uses SIGUSR1 to pause before test if option set. 31 * (See the parse_opts(3) man page). 32 * 33 * DESCRIPTION 34 * This test case tests the functionality of ptrace() for 35 * PTRACE_TRACEME & PTRACE_CONT requests. 36 * Here, we fork a child & the child does ptrace(PTRACE_TRACEME, ...). 37 * Then a signal is delivered to the child & verified that parent 38 * is notified via wait(). then parent does ptrace(PTRACE_CONT, ..) 39 * to make the child to continue. Again parent wait() for child to finish. 40 * If child finished normally, test passes. 41 * We test two cases 42 * 1) By telling child to ignore SIGUSR2 signal 43 * 2) By installing a signal handler for child for SIGUSR2 44 * In both cases, child should stop & notify parent on reception 45 * of SIGUSR2 46 * 47 * Setup: 48 * Setup signal handling. 49 * Pause for SIGUSR1 if option specified. 50 * 51 * Test: 52 * Loop if the proper options are given. 53 * setup signal handler for SIGUSR2 signal 54 * fork a child 55 * 56 * CHILD: 57 * setup signal handler for SIGUSR2 signal 58 * call ptrace() with PTRACE_TRACEME request 59 * send SIGUSR2 signal to self 60 * PARENT: 61 * wait() for child. 62 * if parent is notified when child gets a signal through wait(), 63 * then 64 * do ptrace(PTRACE_CONT, ..) on child 65 * wait() for child to finish, 66 * if child exited normaly, 67 * TEST passed 68 * else 69 * TEST failed 70 * else 71 * TEST failed 72 * 73 * Cleanup: 74 * Print errno log and/or timing stats if options given 75 * 76 * USAGE: <for command-line> 77 * ptrace02 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-h] [-f] [-p] 78 * where, -c n : Run n copies concurrently. 79 * -e : Turn on errno logging. 80 * -h : Show help screen 81 * -f : Turn off functional testing 82 * -i n : Execute test n times. 83 * -I x : Execute test for x seconds. 84 * -p : Pause for SIGUSR1 before starting 85 * -P x : Pause for x seconds between iterations. 86 * -t : Turn on syscall timing. 87 * 88 ****************************************************************/ 89 90 #include <errno.h> 91 #include <signal.h> 92 #include <sys/wait.h> 93 94 #include <config.h> 95 #include "ptrace.h" 96 97 #include "test.h" 98 99 static void do_child(void); 100 static void setup(void); 101 static void cleanup(void); 102 static void child_handler(); 103 static void parent_handler(); 104 105 static int got_signal = 0; 106 107 char *TCID = "ptrace02"; 108 static int i; /* loop test case counter, shared with do_child */ 109 110 int TST_TOTAL = 2; 111 112 int main(int ac, char **av) 113 { 114 115 int lc; 116 pid_t child_pid; 117 int status; 118 struct sigaction parent_act; 119 120 tst_parse_opts(ac, av, NULL, NULL); 121 #ifdef UCLINUX 122 maybe_run_child(&do_child, "d", &i); 123 #endif 124 125 setup(); 126 127 for (lc = 0; TEST_LOOPING(lc); lc++) { 128 129 tst_count = 0; 130 131 for (i = 0; i < TST_TOTAL; ++i) { 132 got_signal = 0; 133 134 /* Setup signal handler for parent */ 135 if (i == 1) { 136 parent_act.sa_handler = parent_handler; 137 parent_act.sa_flags = SA_RESTART; 138 sigemptyset(&parent_act.sa_mask); 139 140 if ((sigaction(SIGUSR2, &parent_act, NULL)) 141 == -1) { 142 tst_resm(TWARN, "sigaction() failed" 143 " in parent"); 144 continue; 145 } 146 } 147 148 switch (child_pid = FORK_OR_VFORK()) { 149 150 case -1: 151 /* fork() failed */ 152 tst_resm(TFAIL, "fork() failed"); 153 continue; 154 155 case 0: 156 /* Child */ 157 #ifdef UCLINUX 158 if (self_exec(av[0], "d", i) < 0) { 159 tst_resm(TFAIL, "self_exec failed"); 160 continue; 161 } 162 #else 163 do_child(); 164 #endif 165 166 default: 167 /* Parent */ 168 if ((waitpid(child_pid, &status, 0)) < 0) { 169 tst_resm(TFAIL, "waitpid() failed"); 170 continue; 171 } 172 173 /* 174 * Check the exit status of child. If (it exits 175 * normally with exit value 1) OR (child came 176 * through signal handler), Test Failed 177 */ 178 179 if (((WIFEXITED(status)) && 180 (WEXITSTATUS(status))) || 181 (got_signal == 1)) { 182 tst_resm(TFAIL, "Test Failed"); 183 continue; 184 } else { 185 /* Restart child */ 186 if ((ptrace(PTRACE_CONT, child_pid, 187 0, 0)) == -1) { 188 tst_resm(TFAIL, "Test Failed:" 189 " Parent was not able to do" 190 " ptrace(PTRACE_CONT, ..) on" 191 " child"); 192 continue; 193 } 194 } 195 196 if ((waitpid(child_pid, &status, 0)) < 0) { 197 tst_resm(TFAIL, "waitpid() failed"); 198 continue; 199 } 200 201 if (WIFEXITED(status)) { 202 /* Child exits normally */ 203 tst_resm(TPASS, "Test Passed"); 204 } else { 205 tst_resm(TFAIL, "Test Failed"); 206 } 207 208 } 209 } 210 } 211 212 /* cleanup and exit */ 213 cleanup(); 214 tst_exit(); 215 216 } 217 218 /* do_child() */ 219 void do_child(void) 220 { 221 struct sigaction child_act; 222 223 /* Setup signal handler for child */ 224 if (i == 0) { 225 child_act.sa_handler = SIG_IGN; 226 } else { 227 child_act.sa_handler = child_handler; 228 } 229 child_act.sa_flags = SA_RESTART; 230 sigemptyset(&child_act.sa_mask); 231 232 if ((sigaction(SIGUSR2, &child_act, NULL)) == -1) { 233 tst_resm(TWARN, "sigaction() failed in child"); 234 exit(1); 235 } 236 237 if ((ptrace(PTRACE_TRACEME, 0, 0, 0)) == -1) { 238 tst_resm(TWARN, "ptrace() failed in child"); 239 exit(1); 240 } 241 242 /* ensure that child bypasses signal handler */ 243 if ((kill(getpid(), SIGUSR2)) == -1) { 244 tst_resm(TWARN, "kill() failed in child"); 245 exit(1); 246 } 247 exit(1); 248 } 249 250 /* setup() - performs all ONE TIME setup for this test */ 251 void setup(void) 252 { 253 254 tst_sig(FORK, DEF_HANDLER, cleanup); 255 256 TEST_PAUSE; 257 258 } 259 260 /* 261 *cleanup() - performs all ONE TIME cleanup for this test at 262 * completion or premature exit. 263 */ 264 void cleanup(void) 265 { 266 267 } 268 269 /* 270 * child_handler() - Signal handler for child 271 */ 272 void child_handler(void) 273 { 274 275 if ((kill(getppid(), SIGUSR2)) == -1) { 276 tst_resm(TWARN, "kill() failed in child_handler()"); 277 exit(1); 278 } 279 } 280 281 /* 282 * parent_handler() - Signal handler for parent 283 */ 284 void parent_handler(void) 285 { 286 287 got_signal = 1; 288 } 289
