1 /*- 2 * Copyright (c) 2014 Mark Johnston <markj@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/wait.h> 32 33 #include <libgen.h> 34 #include <stdio.h> 35 #include <stdint.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <atf-c.h> 39 #include <libelf.h> 40 #include <libproc.h> 41 42 static const char *aout_object = "a.out"; 43 static const char *ldelf_object = "ld-elf.so.1"; 44 static const char *target_prog_file = "target_prog"; 45 46 /* 47 * Run the test program. If the sig parameter is set to true, the test program 48 * will deliver SIGUSR1 to itself during execution. 49 */ 50 static struct proc_handle * 51 start_prog(const struct atf_tc *tc, bool sig) 52 { 53 char *argv[3]; 54 struct proc_handle *phdl; 55 int error; 56 57 asprintf(&argv[0], "%s/%s", atf_tc_get_config_var(tc, "srcdir"), 58 target_prog_file); 59 ATF_REQUIRE(argv[0] != NULL); 60 61 if (sig) { 62 argv[1] = strdup("-s"); 63 argv[2] = NULL; 64 } else { 65 argv[1] = NULL; 66 } 67 68 error = proc_create(argv[0], argv, NULL, NULL, &phdl); 69 ATF_REQUIRE_EQ_MSG(error, 0, "failed to run '%s'", target_prog_file); 70 ATF_REQUIRE(phdl != NULL); 71 72 free(argv[0]); 73 free(argv[1]); 74 75 return (phdl); 76 } 77 78 static void 79 set_bkpt(struct proc_handle *phdl, uintptr_t addr, u_long *saved) 80 { 81 int error; 82 83 error = proc_bkptset(phdl, addr, saved); 84 ATF_REQUIRE_EQ_MSG(error, 0, "failed to set breakpoint at 0x%jx", 85 (uintmax_t)addr); 86 } 87 88 static void 89 remove_bkpt(struct proc_handle *phdl, uintptr_t addr, u_long val) 90 { 91 int error; 92 93 error = proc_bkptdel(phdl, addr, val); 94 ATF_REQUIRE_EQ_MSG(error, 0, 95 "failed to delete breakpoint at 0x%jx", (uintmax_t)addr); 96 97 error = proc_regset(phdl, REG_PC, addr); 98 ATF_REQUIRE_EQ_MSG(error, 0, "failed to reset program counter"); 99 } 100 101 /* 102 * Wait for the specified process to hit a breakpoint at the specified symbol. 103 */ 104 static void 105 verify_bkpt(struct proc_handle *phdl, GElf_Sym *sym, const char *symname, 106 const char *mapname) 107 { 108 char mapbname[MAXPATHLEN], *name; 109 GElf_Sym tsym; 110 prmap_t *map; 111 size_t namesz; 112 u_long addr; 113 int error, state; 114 115 state = proc_wstatus(phdl); 116 ATF_REQUIRE_EQ_MSG(state, PS_STOP, "process has state %d", state); 117 118 /* Get the program counter and decrement it. */ 119 error = proc_regget(phdl, REG_PC, &addr); 120 ATF_REQUIRE_EQ_MSG(error, 0, "failed to obtain PC for '%s'", 121 target_prog_file); 122 proc_bkptregadj(&addr); 123 124 /* 125 * Make sure the PC matches the expected value obtained from the symbol 126 * definition we looked up earlier. 127 */ 128 ATF_CHECK_EQ_MSG(addr, sym->st_value, 129 "program counter 0x%lx doesn't match expected value 0x%jx", 130 addr, (uintmax_t)sym->st_value); 131 132 /* 133 * Ensure we can look up the r_debug_state symbol using its starting 134 * address and that the resulting symbol matches the one we found using 135 * a name lookup. 136 */ 137 namesz = strlen(symname) + 1; 138 name = malloc(namesz); 139 ATF_REQUIRE(name != NULL); 140 141 error = proc_addr2sym(phdl, addr, name, namesz, &tsym); 142 ATF_REQUIRE_EQ_MSG(error, 0, "failed to look up symbol at 0x%lx", addr); 143 ATF_REQUIRE_EQ(memcmp(sym, &tsym, sizeof(*sym)), 0); 144 ATF_REQUIRE_EQ(strcmp(symname, name), 0); 145 free(name); 146 147 map = proc_addr2map(phdl, addr); 148 ATF_REQUIRE_MSG(map != NULL, "failed to look up map for address 0x%lx", 149 addr); 150 basename_r(map->pr_mapname, mapbname); 151 ATF_REQUIRE_EQ_MSG(strcmp(mapname, mapbname), 0, 152 "expected map name '%s' doesn't match '%s'", mapname, mapbname); 153 } 154 155 ATF_TC(map_alias_obj2map); 156 ATF_TC_HEAD(map_alias_obj2map, tc) 157 { 158 atf_tc_set_md_var(tc, "descr", 159 "Callers are supposed to be able to use \"a.out\" as an alias for " 160 "the program executable. Make sure that proc_obj2map() handles " 161 "this properly."); 162 } 163 ATF_TC_BODY(map_alias_obj2map, tc) 164 { 165 struct proc_handle *phdl; 166 prmap_t *map1, *map2; 167 168 phdl = start_prog(tc, false); 169 170 /* Initialize the rtld_db handle. */ 171 (void)proc_rdagent(phdl); 172 173 /* Ensure that "target_prog" and "a.out" return the same map. */ 174 map1 = proc_obj2map(phdl, target_prog_file); 175 ATF_REQUIRE_MSG(map1 != NULL, "failed to look up map for '%s'", 176 target_prog_file); 177 map2 = proc_obj2map(phdl, aout_object); 178 ATF_REQUIRE_MSG(map2 != NULL, "failed to look up map for '%s'", 179 aout_object); 180 ATF_CHECK_EQ(strcmp(map1->pr_mapname, map2->pr_mapname), 0); 181 182 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 183 184 proc_free(phdl); 185 } 186 187 ATF_TC(map_alias_name2map); 188 ATF_TC_HEAD(map_alias_name2map, tc) 189 { 190 atf_tc_set_md_var(tc, "descr", 191 "Callers are supposed to be able to use \"a.out\" as an alias for " 192 "the program executable. Make sure that proc_name2map() handles " 193 "this properly."); 194 } 195 ATF_TC_BODY(map_alias_name2map, tc) 196 { 197 struct proc_handle *phdl; 198 prmap_t *map1, *map2; 199 200 phdl = start_prog(tc, false); 201 202 /* Initialize the rtld_db handle. */ 203 (void)proc_rdagent(phdl); 204 205 /* Ensure that "target_prog" and "a.out" return the same map. */ 206 map1 = proc_name2map(phdl, target_prog_file); 207 ATF_REQUIRE_MSG(map1 != NULL, "failed to look up map for '%s'", 208 target_prog_file); 209 map2 = proc_name2map(phdl, aout_object); 210 ATF_REQUIRE_MSG(map2 != NULL, "failed to look up map for '%s'", 211 aout_object); 212 ATF_CHECK_EQ(strcmp(map1->pr_mapname, map2->pr_mapname), 0); 213 214 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 215 216 proc_free(phdl); 217 } 218 219 ATF_TC(map_alias_name2sym); 220 ATF_TC_HEAD(map_alias_name2sym, tc) 221 { 222 atf_tc_set_md_var(tc, "descr", 223 "Callers are supposed to be able to use \"a.out\" as an alias for " 224 "the program executable. Make sure that proc_name2sym() handles " 225 "this properly."); 226 } 227 ATF_TC_BODY(map_alias_name2sym, tc) 228 { 229 GElf_Sym sym1, sym2; 230 prsyminfo_t si1, si2; 231 struct proc_handle *phdl; 232 int error; 233 234 phdl = start_prog(tc, false); 235 236 /* Initialize the rtld_db handle. */ 237 (void)proc_rdagent(phdl); 238 239 /* 240 * Make sure that "target_prog:main" and "a.out:main" return the same 241 * symbol. 242 */ 243 error = proc_name2sym(phdl, target_prog_file, "main", &sym1, &si1); 244 ATF_REQUIRE_EQ_MSG(error, 0, "failed to look up 'main' via %s", 245 target_prog_file); 246 error = proc_name2sym(phdl, aout_object, "main", &sym2, &si2); 247 ATF_REQUIRE_EQ_MSG(error, 0, "failed to look up 'main' via %s", 248 aout_object); 249 250 ATF_CHECK_EQ(memcmp(&sym1, &sym2, sizeof(sym1)), 0); 251 ATF_CHECK_EQ(si1.prs_id, si2.prs_id); 252 253 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 254 255 proc_free(phdl); 256 } 257 258 ATF_TC(symbol_lookup); 259 ATF_TC_HEAD(symbol_lookup, tc) 260 { 261 atf_tc_set_md_var(tc, "descr", 262 "Look up a couple of well-known symbols in the test program, place " 263 "breakpoints on them, and verify that we hit the breakpoints. Also " 264 "make sure that we can use the breakpoint address to look up the " 265 "corresponding symbol."); 266 } 267 ATF_TC_BODY(symbol_lookup, tc) 268 { 269 GElf_Sym main_sym, r_debug_state_sym; 270 struct proc_handle *phdl; 271 u_long saved; 272 int error; 273 274 phdl = start_prog(tc, false); 275 276 error = proc_name2sym(phdl, target_prog_file, "main", &main_sym, NULL); 277 ATF_REQUIRE_EQ_MSG(error, 0, "failed to look up 'main'"); 278 279 error = proc_name2sym(phdl, ldelf_object, "r_debug_state", 280 &r_debug_state_sym, NULL); 281 ATF_REQUIRE_EQ_MSG(error, 0, "failed to look up 'r_debug_state'"); 282 283 set_bkpt(phdl, r_debug_state_sym.st_value, &saved); 284 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 285 verify_bkpt(phdl, &r_debug_state_sym, "r_debug_state", ldelf_object); 286 remove_bkpt(phdl, r_debug_state_sym.st_value, saved); 287 288 set_bkpt(phdl, main_sym.st_value, &saved); 289 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 290 verify_bkpt(phdl, &main_sym, "main", target_prog_file); 291 remove_bkpt(phdl, main_sym.st_value, saved); 292 293 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 294 295 proc_free(phdl); 296 } 297 298 ATF_TC(signal_forward); 299 ATF_TC_HEAD(signal_forward, tc) 300 { 301 atf_tc_set_md_var(tc, "descr", 302 "Run the test program in a mode which causes it to send a signal " 303 "to itself. Make sure that we intercept the signal and that " 304 "proc_continue() forwards it to the process."); 305 } 306 ATF_TC_BODY(signal_forward, tc) 307 { 308 struct proc_handle *phdl; 309 int state, status; 310 311 phdl = start_prog(tc, true); 312 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 313 314 /* The process should have been interrupted by a signal. */ 315 state = proc_wstatus(phdl); 316 ATF_REQUIRE_EQ_MSG(state, PS_STOP, "process has unexpected state %d", 317 state); 318 319 /* Continue execution and allow the signal to be delivered. */ 320 ATF_CHECK_EQ_MSG(proc_continue(phdl), 0, "failed to resume execution"); 321 322 /* 323 * Make sure the process exited with status 0. If it didn't receive the 324 * SIGUSR1 that it sent to itself, it'll exit with a non-zero exit 325 * status, causing the test to fail. 326 */ 327 state = proc_wstatus(phdl); 328 ATF_REQUIRE_EQ_MSG(state, PS_UNDEAD, "process has unexpected state %d", 329 state); 330 331 status = proc_getwstat(phdl); 332 ATF_REQUIRE(status >= 0); 333 ATF_REQUIRE(WIFEXITED(status)); 334 ATF_REQUIRE_EQ(WEXITSTATUS(status), 0); 335 336 proc_free(phdl); 337 } 338 339 ATF_TP_ADD_TCS(tp) 340 { 341 342 ATF_TP_ADD_TC(tp, map_alias_obj2map); 343 ATF_TP_ADD_TC(tp, map_alias_name2map); 344 ATF_TP_ADD_TC(tp, map_alias_name2sym); 345 ATF_TP_ADD_TC(tp, symbol_lookup); 346 ATF_TP_ADD_TC(tp, signal_forward); 347 348 return (atf_no_error()); 349 } 350