1 /* $OpenBSD: resolve.c,v 1.76 2017/01/22 01:20:36 guenther Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Per Fogelstrom, Opsycon AB 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 */ 28 29 #define _DYN_LOADER 30 31 #include <sys/types.h> 32 33 #include <limits.h> 34 #include <nlist.h> 35 #include <link.h> 36 #include "syscall.h" 37 #include "archdep.h" 38 #include "path.h" 39 #include "resolve.h" 40 41 /* substitution types */ 42 typedef enum { 43 SUBST_UNKNOWN, SUBST_ORIGIN, SUBST_OSNAME, SUBST_OSREL, SUBST_PLATFORM 44 } SUBST_TYPES; 45 46 elf_object_t *_dl_objects; 47 elf_object_t *_dl_last_object; 48 elf_object_t *_dl_loading_object; 49 50 /* 51 * Add a new dynamic object to the object list. 52 */ 53 void 54 _dl_add_object(elf_object_t *object) 55 { 56 /* 57 * If a .so is marked nodelete, then the entire load group that it's 58 * in needs to be kept around forever, so add a reference there. 59 * XXX It would be better if we tracked inter-object dependencies 60 * from relocations and didn't leave dangling pointers when a load 61 * group was partially unloaded. That would render this unnecessary. 62 */ 63 if (object->obj_flags & DF_1_NODELETE && 64 (object->load_object->status & STAT_NODELETE) == 0) { 65 DL_DEB(("objname %s is nodelete\n", object->load_name)); 66 object->load_object->opencount++; 67 object->load_object->status |= STAT_NODELETE; 68 } 69 70 /* 71 * if this is a new object, prev will be NULL 72 * != NULL if an object already in the list 73 * prev == NULL for the first item in the list, but that will 74 * be the executable. 75 */ 76 if (object->prev != NULL) 77 return; 78 79 if (_dl_objects == NULL) { /* First object ? */ 80 _dl_last_object = _dl_objects = object; 81 } else { 82 _dl_last_object->next = object; 83 object->prev = _dl_last_object; 84 _dl_last_object = object; 85 } 86 } 87 88 /* 89 * Identify substitution sequence name. 90 */ 91 static int 92 _dl_subst_name(const char *name, size_t siz) { 93 switch (siz) { 94 case 5: 95 if (_dl_strncmp(name, "OSREL", 5) == 0) 96 return SUBST_OSREL; 97 break; 98 case 6: 99 if (_dl_strncmp(name, "ORIGIN", 6) == 0) 100 return SUBST_ORIGIN; 101 if (_dl_strncmp(name, "OSNAME", 6) == 0) 102 return SUBST_OSNAME; 103 break; 104 case 8: 105 if (_dl_strncmp(name, "PLATFORM", 8) == 0) 106 return SUBST_PLATFORM; 107 break; 108 } 109 110 return (SUBST_UNKNOWN); 111 } 112 113 /* 114 * Perform $ORIGIN substitutions on path 115 */ 116 static void 117 _dl_origin_subst_path(elf_object_t *object, const char *origin_path, 118 char **path) 119 { 120 char tmp_path[PATH_MAX]; 121 char *new_path, *tp; 122 const char *pp, *name, *value; 123 static struct utsname uts; 124 size_t value_len; 125 int skip_brace; 126 127 if (uts.sysname[0] == '\0') { 128 if (_dl_uname(&uts) != 0) 129 return; 130 } 131 132 tp = tmp_path; 133 pp = *path; 134 135 while (*pp != '\0' && (tp - tmp_path) < sizeof(tmp_path)) { 136 137 /* copy over chars up to but not including $ */ 138 while (*pp != '\0' && *pp != '$' && 139 (tp - tmp_path) < sizeof(tmp_path)) 140 *tp++ = *pp++; 141 142 /* substitution sequence detected */ 143 if (*pp == '$' && (tp - tmp_path) < sizeof(tmp_path)) { 144 pp++; 145 146 if ((skip_brace = (*pp == '{'))) 147 pp++; 148 149 /* skip over name */ 150 name = pp; 151 while (_dl_isalnum((unsigned char)*pp) || *pp == '_') 152 pp++; 153 154 switch (_dl_subst_name(name, pp - name)) { 155 case SUBST_ORIGIN: 156 value = origin_path; 157 break; 158 case SUBST_OSNAME: 159 value = uts.sysname; 160 break; 161 case SUBST_OSREL: 162 value = uts.release; 163 break; 164 case SUBST_PLATFORM: 165 value = uts.machine; 166 break; 167 default: 168 value = ""; 169 } 170 171 value_len = _dl_strlen(value); 172 if (value_len >= sizeof(tmp_path) - (tp - tmp_path)) 173 return; 174 175 _dl_bcopy(value, tp, value_len); 176 tp += value_len; 177 178 if (skip_brace && *pp == '}') 179 pp++; 180 } 181 } 182 183 /* no substitution made if result exceeds sizeof(tmp_path) */ 184 if (tp - tmp_path >= sizeof(tmp_path)) 185 return; 186 187 /* NULL terminate tmp_path */ 188 *tp = '\0'; 189 190 if (_dl_strcmp(tmp_path, *path) == 0) 191 return; 192 193 new_path = _dl_strdup(tmp_path); 194 if (new_path == NULL) 195 return; 196 197 DL_DEB(("orig_path %s\n", *path)); 198 DL_DEB(("new_path %s\n", new_path)); 199 200 _dl_free(*path); 201 *path = new_path; 202 } 203 204 /* 205 * Determine origin_path from object load_name. The origin_path argument 206 * must refer to a buffer capable of storing at least PATH_MAX characters. 207 * Returns 0 on success. 208 */ 209 static int 210 _dl_origin_path(elf_object_t *object, char *origin_path) 211 { 212 const char *dirname_path = _dl_dirname(object->load_name); 213 214 if (dirname_path == NULL) 215 return -1; 216 217 if (_dl_realpath(dirname_path, origin_path) == NULL) 218 return -1; 219 220 return 0; 221 } 222 223 /* 224 * Perform $ORIGIN substitutions on runpath and rpath 225 */ 226 static void 227 _dl_origin_subst(elf_object_t *object) 228 { 229 char origin_path[PATH_MAX]; 230 char **pp; 231 232 if (_dl_origin_path(object, origin_path) != 0) 233 return; 234 235 /* perform path substitutions on each segment of runpath and rpath */ 236 for (pp = object->runpath; *pp != NULL; pp++) { 237 _dl_origin_subst_path(object, origin_path, pp); 238 } 239 for (pp = object->rpath; *pp != NULL; pp++) { 240 _dl_origin_subst_path(object, origin_path, pp); 241 } 242 } 243 244 /* 245 * Initialize a new dynamic object. 246 */ 247 elf_object_t * 248 _dl_finalize_object(const char *objname, Elf_Dyn *dynp, Elf_Phdr *phdrp, 249 int phdrc, const int objtype, const long lbase, const long obase) 250 { 251 elf_object_t *object; 252 253 #if 0 254 _dl_printf("objname [%s], dynp %p, objtype %x lbase %lx, obase %lx\n", 255 objname, dynp, objtype, lbase, obase); 256 #endif 257 object = _dl_calloc(1, sizeof(elf_object_t)); 258 if (object == NULL) 259 _dl_exit(7); 260 object->prev = object->next = NULL; 261 262 object->load_dyn = dynp; 263 while (dynp->d_tag != DT_NULL) { 264 if (dynp->d_tag < DT_NUM) 265 object->Dyn.info[dynp->d_tag] = dynp->d_un.d_val; 266 else if (dynp->d_tag >= DT_LOPROC && 267 dynp->d_tag < DT_LOPROC + DT_PROCNUM) 268 object->Dyn.info[dynp->d_tag + DT_NUM - DT_LOPROC] = 269 dynp->d_un.d_val; 270 if (dynp->d_tag == DT_TEXTREL) 271 object->dyn.textrel = 1; 272 if (dynp->d_tag == DT_SYMBOLIC) 273 object->dyn.symbolic = 1; 274 if (dynp->d_tag == DT_BIND_NOW) 275 object->obj_flags |= DF_1_NOW; 276 if (dynp->d_tag == DT_FLAGS_1) 277 object->obj_flags |= dynp->d_un.d_val; 278 if (dynp->d_tag == DT_FLAGS) { 279 object->dyn.flags |= dynp->d_un.d_val; 280 if (dynp->d_un.d_val & DF_SYMBOLIC) 281 object->dyn.symbolic = 1; 282 if (dynp->d_un.d_val & DF_ORIGIN) 283 object->obj_flags |= DF_1_ORIGIN; 284 if (dynp->d_un.d_val & DF_BIND_NOW) 285 object->obj_flags |= DF_1_NOW; 286 } 287 if (dynp->d_tag == DT_RELACOUNT) 288 object->relacount = dynp->d_un.d_val; 289 if (dynp->d_tag == DT_RELCOUNT) 290 object->relcount = dynp->d_un.d_val; 291 dynp++; 292 } 293 DL_DEB((" flags %s = 0x%x\n", objname, object->obj_flags )); 294 object->obj_type = objtype; 295 296 if (_dl_loading_object == NULL) { 297 /* 298 * no loading object, object is the loading object, 299 * as it is either executable, or dlopened() 300 */ 301 _dl_loading_object = object; 302 } 303 304 if ((object->obj_flags & DF_1_NOOPEN) != 0 && 305 _dl_loading_object->obj_type == OBJTYPE_DLO && 306 _dl_traceld == NULL) { 307 _dl_free(object); 308 _dl_errno = DL_CANT_LOAD_OBJ; 309 return(NULL); 310 } 311 312 /* 313 * Now relocate all pointer to dynamic info, but only 314 * the ones which have pointer values. 315 */ 316 if (object->Dyn.info[DT_PLTGOT]) 317 object->Dyn.info[DT_PLTGOT] += obase; 318 if (object->Dyn.info[DT_HASH]) 319 object->Dyn.info[DT_HASH] += obase; 320 if (object->Dyn.info[DT_STRTAB]) 321 object->Dyn.info[DT_STRTAB] += obase; 322 if (object->Dyn.info[DT_SYMTAB]) 323 object->Dyn.info[DT_SYMTAB] += obase; 324 if (object->Dyn.info[DT_RELA]) 325 object->Dyn.info[DT_RELA] += obase; 326 if (object->Dyn.info[DT_SONAME]) 327 object->Dyn.info[DT_SONAME] += object->Dyn.info[DT_STRTAB]; 328 if (object->Dyn.info[DT_RPATH]) 329 object->Dyn.info[DT_RPATH] += object->Dyn.info[DT_STRTAB]; 330 if (object->Dyn.info[DT_REL]) 331 object->Dyn.info[DT_REL] += obase; 332 if (object->Dyn.info[DT_INIT]) 333 object->Dyn.info[DT_INIT] += obase; 334 if (object->Dyn.info[DT_FINI]) 335 object->Dyn.info[DT_FINI] += obase; 336 if (object->Dyn.info[DT_JMPREL]) 337 object->Dyn.info[DT_JMPREL] += obase; 338 if (object->Dyn.info[DT_INIT_ARRAY]) 339 object->Dyn.info[DT_INIT_ARRAY] += obase; 340 if (object->Dyn.info[DT_FINI_ARRAY]) 341 object->Dyn.info[DT_FINI_ARRAY] += obase; 342 if (object->Dyn.info[DT_PREINIT_ARRAY]) 343 object->Dyn.info[DT_PREINIT_ARRAY] += obase; 344 345 if (object->Dyn.info[DT_HASH] != 0) { 346 Elf_Word *hashtab = (Elf_Word *)object->Dyn.info[DT_HASH]; 347 348 object->nbuckets = hashtab[0]; 349 object->nchains = hashtab[1]; 350 object->buckets = hashtab + 2; 351 object->chains = object->buckets + object->nbuckets; 352 } 353 354 object->phdrp = phdrp; 355 object->phdrc = phdrc; 356 object->load_base = lbase; 357 object->obj_base = obase; 358 object->load_name = _dl_strdup(objname); 359 if (object->load_name == NULL) 360 _dl_exit(7); 361 object->load_object = _dl_loading_object; 362 if (object->load_object == object) 363 DL_DEB(("head %s\n", object->load_name)); 364 DL_DEB(("obj %s has %s as head\n", object->load_name, 365 _dl_loading_object->load_name )); 366 object->refcount = 0; 367 TAILQ_INIT(&object->child_list); 368 object->opencount = 0; /* # dlopen() & exe */ 369 object->grprefcount = 0; 370 /* default dev, inode for dlopen-able objects. */ 371 object->dev = 0; 372 object->inode = 0; 373 object->grpsym_gen = 0; 374 TAILQ_INIT(&object->grpsym_list); 375 TAILQ_INIT(&object->grpref_list); 376 377 if (object->dyn.runpath) 378 object->runpath = _dl_split_path(object->dyn.runpath); 379 /* 380 * DT_RPATH is ignored if DT_RUNPATH is present...except in 381 * the exe, whose DT_RPATH is a fallback for libs that don't 382 * use DT_RUNPATH 383 */ 384 if (object->dyn.rpath && (object->runpath == NULL || 385 objtype == OBJTYPE_EXE)) 386 object->rpath = _dl_split_path(object->dyn.rpath); 387 if ((object->obj_flags & DF_1_ORIGIN) && _dl_trust) 388 _dl_origin_subst(object); 389 390 _dl_trace_object_setup(object); 391 392 return (object); 393 } 394 395 static void 396 _dl_tailq_free(struct dep_node *n) 397 { 398 struct dep_node *next; 399 400 while (n != NULL) { 401 next = TAILQ_NEXT(n, next_sib); 402 _dl_free(n); 403 n = next; 404 } 405 } 406 407 elf_object_t *free_objects; 408 409 void 410 _dl_cleanup_objects() 411 { 412 elf_object_t *nobj, *head; 413 struct dep_node *n, *next; 414 415 n = TAILQ_FIRST(&_dlopened_child_list); 416 while (n != NULL) { 417 next = TAILQ_NEXT(n, next_sib); 418 if (OBJECT_DLREF_CNT(n->data) == 0) { 419 TAILQ_REMOVE(&_dlopened_child_list, n, next_sib); 420 _dl_free(n); 421 } 422 n = next; 423 } 424 425 head = free_objects; 426 free_objects = NULL; 427 while (head != NULL) { 428 _dl_free(head->load_name); 429 _dl_free((char *)head->sod.sod_name); 430 _dl_free_path(head->runpath); 431 _dl_free_path(head->rpath); 432 _dl_tailq_free(TAILQ_FIRST(&head->grpsym_list)); 433 _dl_tailq_free(TAILQ_FIRST(&head->child_list)); 434 _dl_tailq_free(TAILQ_FIRST(&head->grpref_list)); 435 nobj = head->next; 436 _dl_free(head); 437 head = nobj; 438 } 439 } 440 441 void 442 _dl_remove_object(elf_object_t *object) 443 { 444 object->prev->next = object->next; 445 if (object->next) 446 object->next->prev = object->prev; 447 448 if (_dl_last_object == object) 449 _dl_last_object = object->prev; 450 451 object->next = free_objects; 452 free_objects = object; 453 } 454 455 /* 456 * mprotect a segment to the indicated protection. If 'addr' is non-zero, 457 * then it's the start address, else the value of 'start_sym' is the start. 458 * The value of 'end_sym' is the end address. The start is rounded down 459 * and the end is rounded up to page boundaries. Returns 'addr' or the 460 * address of the start symbol. 461 */ 462 void * 463 _dl_protect_segment(elf_object_t *object, Elf_Addr addr, 464 const char *start_sym, const char *end_sym, int prot) 465 { 466 const Elf_Sym *this; 467 Elf_Addr ooff, start, end; 468 469 if (addr == 0 && start_sym[2] == 'g' && 470 (addr = object->relro_addr) != 0) { 471 DL_DEB(("protect start RELRO = 0x%lx in %s\n", 472 addr, object->load_name)); 473 } 474 else if (addr == 0) { 475 this = NULL; 476 ooff = _dl_find_symbol(start_sym, &this, 477 SYM_SEARCH_OBJ | SYM_NOWARNNOTFOUND | SYM_PLT, NULL, 478 object, NULL); 479 /* If not found, nothing to do */ 480 if (this == NULL) { 481 DL_DEB(("protect start \"%s\" not found in %s\n", 482 start_sym, object->load_name)); 483 return (NULL); 484 } 485 addr = ooff + this->st_value; 486 DL_DEB(("protect start \"%s\" to %x = 0x%lx in %s\n", 487 start_sym, prot, addr, object->load_name)); 488 } 489 490 if (object->relro_addr != 0 && start_sym[2] == 'g') { 491 end = object->relro_addr + object->relro_size; 492 DL_DEB(("protect end RELRO = 0x%lx in %s\n", 493 end, object->load_name)); 494 } else { 495 this = NULL; 496 ooff = _dl_find_symbol(end_sym, &this, 497 SYM_SEARCH_OBJ | SYM_NOWARNNOTFOUND | SYM_PLT, NULL, 498 object, NULL); 499 if (this == NULL) { 500 DL_DEB(("protect end \"%s\" not found in %s\n", 501 end_sym, object->load_name)); 502 addr = 0; 503 } else { 504 end = ooff + this->st_value; 505 DL_DEB(("protect end \"%s\" = 0x%lx in %s\n", 506 end_sym, end, object->load_name)); 507 } 508 } 509 510 if (addr != 0 && addr < end) { 511 start = ELF_TRUNC(addr, _dl_pagesz); 512 end = ELF_ROUND(end, _dl_pagesz); 513 _dl_mprotect((void *)start, end - start, prot); 514 } 515 516 return ((void *)addr); 517 } 518 519 520 sym_cache *_dl_symcache; 521 int _dl_symcachestat_hits; 522 int _dl_symcachestat_lookups; 523 524 525 Elf_Addr 526 _dl_find_symbol_bysym(elf_object_t *req_obj, unsigned int symidx, 527 const Elf_Sym **this, int flags, const Elf_Sym *ref_sym, const elf_object_t **pobj) 528 { 529 Elf_Addr ret; 530 const Elf_Sym *sym; 531 const char *symn; 532 const elf_object_t *sobj; 533 534 _dl_symcachestat_lookups ++; 535 if (_dl_symcache != NULL && 536 symidx < req_obj->nchains && 537 _dl_symcache[symidx].obj != NULL && 538 _dl_symcache[symidx].sym != NULL && 539 _dl_symcache[symidx].flags == flags) { 540 541 _dl_symcachestat_hits++; 542 sobj = _dl_symcache[symidx].obj; 543 *this = _dl_symcache[symidx].sym; 544 if (pobj) 545 *pobj = sobj; 546 return sobj->obj_base; 547 } 548 549 sym = req_obj->dyn.symtab; 550 sym += symidx; 551 symn = req_obj->dyn.strtab + sym->st_name; 552 553 ret = _dl_find_symbol(symn, this, flags, ref_sym, req_obj, &sobj); 554 555 if (pobj) 556 *pobj = sobj; 557 558 if (_dl_symcache != NULL && symidx < req_obj->nchains) { 559 #if 0 560 DL_DEB(("cache miss %d %p %p, %p %p %s %s %d %d %s\n", 561 symidx, 562 _dl_symcache[symidx].sym, *this, 563 _dl_symcache[symidx].obj, sobj, sobj->load_name, 564 sobj->dyn.strtab + (*this)->st_name, 565 _dl_symcache[symidx].flags, flags, req_obj->load_name)); 566 #endif 567 568 _dl_symcache[symidx].sym = *this; 569 _dl_symcache[symidx].obj = sobj; 570 _dl_symcache[symidx].flags = flags; 571 } 572 573 return ret; 574 } 575 576 static int 577 _dl_find_symbol_obj(elf_object_t *object, const char *name, unsigned long hash, 578 int flags, const Elf_Sym **this, const Elf_Sym **weak_sym, 579 elf_object_t **weak_object) 580 { 581 const Elf_Sym *symt = object->dyn.symtab; 582 const char *strt = object->dyn.strtab; 583 long si; 584 const char *symn; 585 586 for (si = object->buckets[hash % object->nbuckets]; 587 si != STN_UNDEF; si = object->chains[si]) { 588 const Elf_Sym *sym = symt + si; 589 590 if (sym->st_value == 0) 591 continue; 592 593 if (ELF_ST_TYPE(sym->st_info) != STT_NOTYPE && 594 ELF_ST_TYPE(sym->st_info) != STT_OBJECT && 595 ELF_ST_TYPE(sym->st_info) != STT_FUNC) 596 continue; 597 598 symn = strt + sym->st_name; 599 if (sym != *this && _dl_strcmp(symn, name)) 600 continue; 601 602 /* allow this symbol if we are referring to a function 603 * which has a value, even if section is UNDEF. 604 * this allows &func to refer to PLT as per the 605 * ELF spec. st_value is checked above. 606 * if flags has SYM_PLT set, we must have actual 607 * symbol, so this symbol is skipped. 608 */ 609 if (sym->st_shndx == SHN_UNDEF) { 610 if ((flags & SYM_PLT) || sym->st_value == 0 || 611 ELF_ST_TYPE(sym->st_info) != STT_FUNC) 612 continue; 613 } 614 615 if (ELF_ST_BIND(sym->st_info) == STB_GLOBAL) { 616 *this = sym; 617 return 1; 618 } else if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { 619 if (!*weak_sym) { 620 *weak_sym = sym; 621 *weak_object = object; 622 } 623 } 624 } 625 return 0; 626 } 627 628 Elf_Addr 629 _dl_find_symbol(const char *name, const Elf_Sym **this, 630 int flags, const Elf_Sym *ref_sym, elf_object_t *req_obj, 631 const elf_object_t **pobj) 632 { 633 const Elf_Sym *weak_sym = NULL; 634 unsigned long h = 0; 635 const char *p = name; 636 elf_object_t *object = NULL, *weak_object = NULL; 637 int found = 0; 638 struct dep_node *n, *m; 639 640 641 while (*p) { 642 unsigned long g; 643 h = (h << 4) + *p++; 644 if ((g = h & 0xf0000000)) 645 h ^= g >> 24; 646 h &= ~g; 647 } 648 649 if (req_obj->dyn.symbolic) 650 if (_dl_find_symbol_obj(req_obj, name, h, flags, this, &weak_sym, 651 &weak_object)) { 652 object = req_obj; 653 found = 1; 654 goto found; 655 } 656 657 if (flags & SYM_SEARCH_OBJ) { 658 if (_dl_find_symbol_obj(req_obj, name, h, flags, this, 659 &weak_sym, &weak_object)) { 660 object = req_obj; 661 found = 1; 662 } 663 } else if (flags & SYM_DLSYM) { 664 if (_dl_find_symbol_obj(req_obj, name, h, flags, this, 665 &weak_sym, &weak_object)) { 666 object = req_obj; 667 found = 1; 668 } 669 if (weak_object != NULL && found == 0) { 670 object=weak_object; 671 *this = weak_sym; 672 found = 1; 673 } 674 /* search dlopened obj and all children */ 675 676 if (found == 0) { 677 TAILQ_FOREACH(n, &req_obj->load_object->grpsym_list, 678 next_sib) { 679 if (_dl_find_symbol_obj(n->data, name, h, 680 flags, this, 681 &weak_sym, &weak_object)) { 682 object = n->data; 683 found = 1; 684 break; 685 } 686 } 687 } 688 } else { 689 int skip = 0; 690 691 if ((flags & SYM_SEARCH_SELF) || (flags & SYM_SEARCH_NEXT)) 692 skip = 1; 693 694 /* 695 * search dlopened objects: global or req_obj == dlopened_obj 696 * and and it's children 697 */ 698 TAILQ_FOREACH(n, &_dlopened_child_list, next_sib) { 699 if (((n->data->obj_flags & DF_1_GLOBAL) == 0) && 700 (n->data != req_obj->load_object)) 701 continue; 702 703 TAILQ_FOREACH(m, &n->data->grpsym_list, next_sib) { 704 if (skip == 1) { 705 if (m->data == req_obj) { 706 skip = 0; 707 if (flags & SYM_SEARCH_NEXT) 708 continue; 709 } else 710 continue; 711 } 712 if ((flags & SYM_SEARCH_OTHER) && 713 (m->data == req_obj)) 714 continue; 715 if (_dl_find_symbol_obj(m->data, name, h, flags, 716 this, &weak_sym, &weak_object)) { 717 object = m->data; 718 found = 1; 719 goto found; 720 } 721 } 722 } 723 } 724 725 found: 726 if (weak_object != NULL && found == 0) { 727 object=weak_object; 728 *this = weak_sym; 729 found = 1; 730 } 731 732 733 if (found == 0) { 734 if ((ref_sym == NULL || 735 (ELF_ST_BIND(ref_sym->st_info) != STB_WEAK)) && 736 (flags & SYM_WARNNOTFOUND)) 737 _dl_printf("%s:%s: undefined symbol '%s'\n", 738 __progname, req_obj->load_name, name); 739 return (0); 740 } 741 742 if (ref_sym != NULL && ref_sym->st_size != 0 && 743 (ref_sym->st_size != (*this)->st_size) && 744 (ELF_ST_TYPE((*this)->st_info) != STT_FUNC) ) { 745 _dl_printf("%s:%s: %s : WARNING: " 746 "symbol(%s) size mismatch, relink your program\n", 747 __progname, req_obj->load_name, object->load_name, name); 748 } 749 750 if (pobj) 751 *pobj = object; 752 753 return (object->obj_base); 754 } 755 756 void 757 _dl_debug_state(void) 758 { 759 /* Debugger stub */ 760 } 761