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 (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include "_synonyms.h" 32 33 #include <string.h> 34 #include <stdio.h> 35 #include <unistd.h> 36 #include <sys/stat.h> 37 #include <sys/mman.h> 38 #include <fcntl.h> 39 #include <limits.h> 40 #include <dlfcn.h> 41 #include <errno.h> 42 #include <link.h> 43 #include <debug.h> 44 #include <conv.h> 45 #include "_rtld.h" 46 #include "_audit.h" 47 #include "_elf.h" 48 #include "msg.h" 49 50 static Fct * vector[] = { 51 &elf_fct, 52 #ifdef A_OUT 53 &aout_fct, 54 #endif 55 0 56 }; 57 58 /* 59 * If a load filter flag is in effect, and this object is a filter, trigger the 60 * loading of all its filtees. The load filter flag is in effect when creating 61 * configuration files, or when under the control of ldd(1), or the LD_LOADFLTR 62 * environment variable is set, or this object was built with the -zloadfltr 63 * flag. Otherwise, filtee loading is deferred until triggered by a relocation. 64 */ 65 static void 66 load_filtees(Rt_map *lmp) 67 { 68 if ((FLAGS1(lmp) & MSK_RT_FILTER) && 69 ((FLAGS(lmp) & FLG_RT_LOADFLTR) || 70 (LIST(lmp)->lm_tflags & LML_TFLG_LOADFLTR))) { 71 Dyninfo * dip = DYNINFO(lmp); 72 uint_t cnt, max = DYNINFOCNT(lmp); 73 Slookup sl; 74 75 sl.sl_name = 0; 76 sl.sl_hash = 0; 77 sl.sl_imap = sl.sl_cmap = lmp; 78 79 for (cnt = 0; cnt < max; cnt++, dip++) { 80 if (((dip->di_flags & MSK_DI_FILTER) == 0) || 81 ((dip->di_flags & FLG_DI_AUXFLTR) && 82 (rtld_flags & RT_FL_NOAUXFLTR))) 83 continue; 84 (void) elf_lookup_filtee(&sl, 0, 0, cnt); 85 } 86 } 87 } 88 89 /* 90 * Analyze one or more link-maps of a link map control list. This routine is 91 * called at startup to continue the processing of the main executable. It is 92 * also called each time a new set of objects are loaded, ie. from filters, 93 * lazy-loaded objects, or dlopen(). 94 * 95 * In each instance we traverse the link-map control list starting with the 96 * initial object. As dependencies are analyzed they are added to the link-map 97 * control list. Thus the list grows as we traverse it - this results in the 98 * breadth first ordering of all needed objects. 99 */ 100 int 101 analyze_lmc(Lm_list *lml, Aliste nlmco, Rt_map *nlmp) 102 { 103 Rt_map *lmp = nlmp; 104 Lm_cntl *nlmc; 105 int ret = 1; 106 107 /* 108 * If this link-map control list is being analyzed, return. The object 109 * that has just been added will be picked up by the existing analysis 110 * thread. Note, this is only really meaningful during process init- 111 * ialization, as objects are added to the main link-map control list. 112 * Following this initialization, each family of objects that are loaded 113 * are added to a new link-map control list. 114 */ 115 /* LINTED */ 116 nlmc = (Lm_cntl *)((char *)lml->lm_lists + nlmco); 117 if (nlmc->lc_flags & LMC_FLG_ANALYZING) 118 return (1); 119 120 /* 121 * If this object doesn't belong to the present link-map control list 122 * then it must already have been analyzed, or it is in the process of 123 * being analyzed prior to us recursing into this analysis. In either 124 * case, ignore the object as it's already being taken care of. 125 */ 126 if (nlmco != CNTL(nlmp)) 127 return (1); 128 129 nlmc->lc_flags |= LMC_FLG_ANALYZING; 130 131 for (; lmp; lmp = (Rt_map *)NEXT(lmp)) { 132 if (FLAGS(lmp) & 133 (FLG_RT_ANALZING | FLG_RT_ANALYZED | FLG_RT_DELETE)) 134 continue; 135 136 /* 137 * Indicate that analyzing is under way. 138 */ 139 FLAGS(lmp) |= FLG_RT_ANALZING; 140 141 /* 142 * If this link map represents a relocatable object, then we 143 * need to finish the link-editing of the object at this point. 144 */ 145 if (FLAGS(lmp) & FLG_RT_OBJECT) { 146 if (elf_obj_fini(lml, lmp) == 0) { 147 if (lml->lm_flags & LML_FLG_TRC_ENABLE) 148 continue; 149 ret = 0; 150 break; 151 } 152 } 153 154 DBG_CALL(Dbg_file_analyze(lmp)); 155 156 /* 157 * Establish any dependencies this object requires. 158 */ 159 if (LM_NEEDED(lmp)(lml, nlmco, lmp) == 0) { 160 if (lml->lm_flags & LML_FLG_TRC_ENABLE) 161 continue; 162 ret = 0; 163 break; 164 } 165 166 FLAGS(lmp) &= ~FLG_RT_ANALZING; 167 FLAGS(lmp) |= FLG_RT_ANALYZED; 168 169 /* 170 * If we're building a configuration file, determine if this 171 * object is a filter and if so load its filtees. This 172 * traversal is only necessary for crle(1), as typical use of 173 * an object will load filters as part of relocation processing. 174 */ 175 if (MODE(nlmp) & RTLD_CONFGEN) 176 load_filtees(lmp); 177 178 /* 179 * If an interposer has been added, it will have been inserted 180 * in the link-map before the link we're presently analyzing. 181 * Break out of this analysis loop and return to the head of 182 * the link-map control list to analyze the interposer. Note 183 * that this rescan preserves the breadth first loading of 184 * dependencies. 185 */ 186 /* LINTED */ 187 nlmc = (Lm_cntl *)((char *)lml->lm_lists + nlmco); 188 if (nlmc->lc_flags & LMC_FLG_REANALYZE) { 189 nlmc->lc_flags &= ~LMC_FLG_REANALYZE; 190 lmp = nlmc->lc_head; 191 } 192 } 193 194 /* LINTED */ 195 nlmc = (Lm_cntl *)((char *)lml->lm_lists + nlmco); 196 nlmc->lc_flags &= ~LMC_FLG_ANALYZING; 197 198 return (ret); 199 } 200 201 /* 202 * Copy relocation test. If the symbol definition is within .bss, then it's 203 * zero filled, and as the destination is within .bss, we can skip copying 204 * zero's to zero's. However, if the destination object has a MOVE table, it's 205 * .bss might contain non-zero data, in which case copy it regardless. 206 */ 207 static int 208 copy_zerobits(Rt_map *dlmp, Sym *dsym) 209 { 210 if ((FLAGS(dlmp) & FLG_RT_MOVE) == 0) { 211 Mmap *mmaps; 212 caddr_t daddr = (caddr_t)dsym->st_value; 213 214 if ((FLAGS(dlmp) & FLG_RT_FIXED) == 0) 215 daddr += ADDR(dlmp); 216 217 for (mmaps = MMAPS(dlmp); mmaps->m_vaddr; mmaps++) { 218 if ((mmaps->m_fsize != mmaps->m_msize) && 219 (daddr >= (mmaps->m_vaddr + mmaps->m_fsize)) && 220 (daddr < (mmaps->m_vaddr + mmaps->m_msize))) 221 return (1); 222 } 223 } 224 return (0); 225 } 226 227 /* 228 * Relocate an individual object. 229 */ 230 static int 231 relocate_so(Lm_list *lml, Rt_map *lmp, int *relocated, int now) 232 { 233 /* 234 * If we're running under ldd(1), and haven't been asked to trace any 235 * warnings, skip any actual relocation processing. 236 */ 237 if (((lml->lm_flags & LML_FLG_TRC_ENABLE) == 0) || 238 (lml->lm_flags & LML_FLG_TRC_WARN)) { 239 240 if (relocated) 241 (*relocated)++; 242 243 if ((LM_RELOC(lmp)(lmp, now) == 0) && 244 ((lml->lm_flags & LML_FLG_TRC_ENABLE) == 0)) 245 return (0); 246 } 247 return (1); 248 } 249 250 /* 251 * Relocate the objects on a link-map control list. 252 */ 253 static int 254 _relocate_lmc(Lm_list *lml, Rt_map *nlmp, int *relocated) 255 { 256 Rt_map *lmp; 257 258 for (lmp = nlmp; lmp; lmp = (Rt_map *)NEXT(lmp)) { 259 /* 260 * If this object has already been relocated, we're done. If 261 * this object is being deleted, skip it, there's probably a 262 * relocation error somewhere that's causing this deletion. 263 */ 264 if (FLAGS(lmp) & 265 (FLG_RT_RELOCING | FLG_RT_RELOCED | FLG_RT_DELETE)) 266 continue; 267 268 /* 269 * Indicate that relocation processing is under way. 270 */ 271 FLAGS(lmp) |= FLG_RT_RELOCING; 272 273 /* 274 * Relocate the object. 275 */ 276 if (relocate_so(lml, lmp, relocated, 0) == 0) 277 return (0); 278 279 /* 280 * Indicate that the objects relocation is complete. 281 */ 282 FLAGS(lmp) &= ~FLG_RT_RELOCING; 283 FLAGS(lmp) |= FLG_RT_RELOCED; 284 285 /* 286 * Mark this object's init is available for harvesting. Under 287 * ldd(1) this marking is necessary for -i (tsort) gathering. 288 */ 289 lml->lm_init++; 290 lml->lm_flags |= LML_FLG_OBJADDED; 291 292 /* 293 * Process any move data (not necessary under ldd()). 294 */ 295 if ((FLAGS(lmp) & FLG_RT_MOVE) && 296 ((lml->lm_flags & LML_FLG_TRC_ENABLE) == 0)) 297 move_data(lmp); 298 299 /* 300 * Determine if this object is a filter, and if a load filter 301 * flag is in effect, trigger the loading of all its filtees. 302 */ 303 load_filtees(lmp); 304 } 305 306 /* 307 * Perform special copy relocations. These are only meaningful for 308 * dynamic executables (fixed and head of their link-map list). If 309 * this ever has to change then the infrastructure of COPY() has to 310 * change as presently this element is used to capture both receiver 311 * and supplier of copy data. 312 */ 313 if ((FLAGS(nlmp) & FLG_RT_FIXED) && (nlmp == LIST(nlmp)->lm_head) && 314 (((lml->lm_flags & LML_FLG_TRC_ENABLE) == 0) || 315 (lml->lm_flags & LML_FLG_TRC_WARN))) { 316 Rt_map ** lmpp; 317 Aliste off1; 318 Word tracing; 319 320 #if defined(__i386) 321 if (elf_copy_gen(nlmp) == 0) 322 return (0); 323 #endif 324 if (COPY(nlmp) == 0) 325 return (1); 326 327 if ((LIST(nlmp)->lm_flags & LML_FLG_TRC_ENABLE) && 328 (((rtld_flags & RT_FL_SILENCERR) == 0) || 329 (LIST(nlmp)->lm_flags & LML_FLG_TRC_VERBOSE))) 330 tracing = 1; 331 else 332 tracing = 0; 333 334 DBG_CALL(Dbg_util_nl(lml, DBG_NL_STD)); 335 336 for (ALIST_TRAVERSE(COPY(nlmp), off1, lmpp)) { 337 Rt_map * lmp = *lmpp; 338 Rel_copy * rcp; 339 Aliste off2; 340 341 for (ALIST_TRAVERSE(COPY(lmp), off2, rcp)) { 342 int zero; 343 344 /* 345 * Only copy the bits if it's from non-zero 346 * filled memory. 347 */ 348 zero = copy_zerobits(rcp->r_dlmp, rcp->r_dsym); 349 DBG_CALL(Dbg_reloc_copy(rcp->r_dlmp, nlmp, 350 rcp->r_name, zero)); 351 if (zero) 352 continue; 353 354 (void) memcpy(rcp->r_radd, rcp->r_dadd, 355 rcp->r_size); 356 357 if ((tracing == 0) || ((FLAGS1(rcp->r_dlmp) & 358 FL1_RT_DISPREL) == 0)) 359 continue; 360 361 (void) printf(MSG_INTL(MSG_LDD_REL_CPYDISP), 362 demangle(rcp->r_name), NAME(rcp->r_dlmp)); 363 } 364 } 365 366 DBG_CALL(Dbg_util_nl(lml, DBG_NL_STD)); 367 368 free(COPY(nlmp)); 369 COPY(nlmp) = 0; 370 } 371 return (1); 372 } 373 374 int 375 relocate_lmc(Lm_list *lml, Aliste nlmco, Rt_map *clmp, Rt_map *nlmp) 376 { 377 int lret = 1, pret = 1; 378 Alist *alp; 379 Aliste plmco; 380 Lm_cntl *plmc, *nlmc; 381 382 /* 383 * If this link-map control list is being relocated, return. The object 384 * that has just been added will be picked up by the existing relocation 385 * thread. Note, this is only really meaningful during process init- 386 * ialization, as objects are added to the main link-map control list. 387 * Following this initialization, each family of objects that are loaded 388 * are added to a new link-map control list. 389 */ 390 /* LINTED */ 391 nlmc = (Lm_cntl *)((char *)lml->lm_lists + nlmco); 392 393 if (nlmc->lc_flags & LMC_FLG_RELOCATING) 394 return (1); 395 396 nlmc->lc_flags |= LMC_FLG_RELOCATING; 397 398 /* 399 * Relocate one or more link-maps of a link map control list. If this 400 * object doesn't belong to the present link-map control list then it 401 * must already have been relocated, or it is in the process of being 402 * relocated prior to us recursing into this relocation. In either 403 * case, ignore the object as it's already being taken care of, however, 404 * fall through and capture any relocation promotions that might have 405 * been established from the reference mode of this object. 406 * 407 * If we're generating a configuration file using crle(1), two passes 408 * may be involved. Under the first pass, RTLD_CONFGEN is set. Under 409 * this pass, crle() loads objects into the process address space. No 410 * relocation is necessary at this point, we simply need to analyze the 411 * objects to insure any directly bound dependencies, filtees, etc. 412 * get loaded. Although we skip the relocation, fall through to insure 413 * any control lists are maintained appropriately. 414 * 415 * If objects are to be dldump(3c)'ed, crle(1) makes a second pass, 416 * using RTLD_NOW and RTLD_CONFGEN. The RTLD_NOW effectively carries 417 * out the relocations of all loaded objects. 418 */ 419 if ((nlmco == CNTL(nlmp)) && 420 ((MODE(nlmp) & (RTLD_NOW | RTLD_CONFGEN)) != RTLD_CONFGEN)) { 421 int relocated = 0; 422 423 /* 424 * Determine whether the initial link-map control list has 425 * started relocation. From this point, should any interposing 426 * objects be added to this link-map control list, the objects 427 * are demoted to standard objects. Their interposition can't 428 * be guaranteed once relocations have been carried out. 429 */ 430 if (nlmco == ALO_DATA) 431 lml->lm_flags |= LML_FLG_STARTREL; 432 433 /* 434 * Relocate the link-map control list. Should this relocation 435 * fail, clean up this link-map list. Relocations within this 436 * list may have required relocation promotions on other lists, 437 * so before acting upon these, and possibly adding more objects 438 * to the present link-map control list, try and clean up any 439 * failed objects now. 440 */ 441 lret = _relocate_lmc(lml, nlmp, &relocated); 442 if ((lret == 0) && (nlmco != ALO_DATA)) 443 remove_lmc(lml, clmp, nlmc, nlmco, NAME(nlmp)); 444 } 445 446 /* 447 * Determine the new, and previous link-map control lists. 448 */ 449 /* LINTED */ 450 nlmc = (Lm_cntl *)((char *)lml->lm_lists + nlmco); 451 if (nlmco == ALO_DATA) { 452 plmco = nlmco; 453 plmc = nlmc; 454 } else { 455 plmco = nlmco - lml->lm_lists->al_size; 456 /* LINTED */ 457 plmc = (Lm_cntl *)((char *)lml->lm_lists + plmco); 458 } 459 460 /* 461 * Having completed this control list of objects, they can now be bound 462 * to from other objects. Move this control list to the control list 463 * that precedes it. Although this control list may have only bound to 464 * controls lists much higher up the control list stack, it must only 465 * be moved up one control list so as to preserve the link-map order 466 * that may have already been traversed in search of symbols. 467 */ 468 if (lret && (nlmco != ALO_DATA) && nlmc->lc_head) 469 lm_move(lml, nlmco, plmco, nlmc, plmc); 470 471 /* 472 * Determine whether existing objects that have already been relocated, 473 * need any additional relocations performed. This can occur when new 474 * objects are loaded with RTLD_NOW, and these new objects have 475 * dependencies on objects that are already loaded. Note, that we peel 476 * any relocation promotions off of one control list at a time. This 477 * prevents relocations from being bound to objects that might yet fail 478 * to relocate themselves. 479 */ 480 while ((alp = plmc->lc_now) != 0) { 481 Aliste off; 482 Rt_map **lmpp; 483 484 /* 485 * Remove the relocation promotion list, as performing more 486 * relocations may result in discovering more objects that need 487 * promotion. 488 */ 489 plmc->lc_now = 0; 490 491 for (ALIST_TRAVERSE(alp, off, lmpp)) { 492 Rt_map *lmp = *lmpp; 493 494 /* 495 * If the original relocation of the link-map control 496 * list failed, or one of the relocation promotions of 497 * this loop has failed, demote any pending objects 498 * relocation mode. 499 */ 500 if ((lret == 0) || (pret == 0)) { 501 MODE(lmp) &= ~RTLD_NOW; 502 MODE(lmp) |= RTLD_LAZY; 503 continue; 504 } 505 506 /* 507 * If a relocation fails, save the error condition. 508 * It's possible that all new objects on the original 509 * link-map control list have been relocated 510 * successfully, but if the user request requires 511 * promoting objects that have already been loaded, we 512 * have to indicate that this operation couldn't be 513 * performed. The unrelocated objects are in use on 514 * another control list, and may continue to be used. 515 * If the .plt that resulted in the error is called, 516 * then the process will receive a fatal error at that 517 * time. But, the .plt may never be called. 518 */ 519 if (relocate_so(lml, lmp, 0, 1) == 0) 520 pret = 0; 521 } 522 523 /* 524 * Having promoted any objects, determine whether additional 525 * dependencies were added, and if so move them to the previous 526 * link-map control list. 527 */ 528 /* LINTED */ 529 nlmc = (Lm_cntl *)((char *)lml->lm_lists + nlmco); 530 /* LINTED */ 531 plmc = (Lm_cntl *)((char *)lml->lm_lists + plmco); 532 if ((nlmco != ALO_DATA) && nlmc->lc_head) 533 lm_move(lml, nlmco, plmco, nlmc, plmc); 534 free(alp); 535 } 536 537 /* 538 * If relocations have been successful, indicate that relocations are 539 * no longer active for this control list. Otherwise, leave the 540 * relocation flag, as this flag is used to determine the style of 541 * cleanup (see remove_lmc()). 542 */ 543 if (lret && pret) { 544 /* LINTED */ 545 nlmc = (Lm_cntl *)((char *)lml->lm_lists + nlmco); 546 nlmc->lc_flags &= ~LMC_FLG_RELOCATING; 547 548 return (1); 549 } 550 551 return (0); 552 } 553 554 /* 555 * Inherit the first rejection message for possible later diagnostics. 556 * 557 * Any attempt to process a file that is unsuccessful, should be accompanied 558 * with an error diagnostic. However, some operations like searching for a 559 * simple filename, involve trying numerous paths, and an error message for each 560 * lookup is not required. Although a multiple search can fail, it's possible 561 * that a file was found, but was rejected because it was the wrong type. 562 * To satisfy these possibilities, the first failure is recorded as a rejection 563 * message, and this message is used later for a more specific diagnostic. 564 * 565 * File searches are focused at load_one(), and from here a rejection descriptor 566 * is passed down to various child routines. If these child routines can 567 * process multiple files, then they will maintain their own rejection desc- 568 * riptor. This is filled in for any failures, and a diagnostic produced to 569 * reflect the failure. The child routines then employ rejection_inherit() to 570 * pass the first rejection message back to load_one(). 571 * 572 * Note that the name, and rejection string must be duplicated, as the name 573 * buffer and error string buffer (see conv_ routines) may be reused for 574 * additional processing or rejection messages. 575 */ 576 void 577 rejection_inherit(Rej_desc *rej1, Rej_desc *rej2) 578 { 579 if (rej2->rej_type && (rej1->rej_type == 0)) { 580 rej1->rej_type = rej2->rej_type; 581 rej1->rej_info = rej2->rej_info; 582 rej1->rej_flag = rej2->rej_flag; 583 if (rej2->rej_name) 584 rej1->rej_name = strdup(rej2->rej_name); 585 if (rej2->rej_str) { 586 if ((rej1->rej_str = strdup(rej2->rej_str)) == NULL) 587 rej1->rej_str = MSG_ORIG(MSG_EMG_ENOMEM); 588 } 589 } 590 } 591 592 /* 593 * Determine the object type of a file. 594 */ 595 Fct * 596 are_u_this(Rej_desc *rej, int fd, struct stat *status, const char *name) 597 { 598 int i; 599 char *maddr = 0; 600 601 fmap->fm_fsize = status->st_size; 602 603 /* 604 * If this is a directory (which can't be mmap()'ed) generate a precise 605 * error message. 606 */ 607 if ((status->st_mode & S_IFMT) == S_IFDIR) { 608 rej->rej_type = SGS_REJ_STR; 609 rej->rej_str = strerror(EISDIR); 610 return (0); 611 } 612 613 /* 614 * Map in the first page of the file. When this buffer is first used, 615 * the mapping is a single system page. This is typically enough to 616 * inspect the ehdr and phdrs of the file, and can be reused for each 617 * file that get loaded. If a larger mapping is required to read the 618 * ehdr and phdrs, a new mapping is created (see elf_map_it()). This 619 * new mapping is again used for each new file loaded. Some objects, 620 * such as filters, only take up one page, and in this case this mapping 621 * will suffice for the file. 622 */ 623 maddr = mmap(fmap->fm_maddr, fmap->fm_msize, (PROT_READ | PROT_EXEC), 624 fmap->fm_mflags, fd, 0); 625 #if defined(MAP_ALIGN) 626 if ((maddr == MAP_FAILED) && (errno == EINVAL)) { 627 /* 628 * If the mapping failed, and we used MAP_ALIGN, assume we're 629 * on a system that doesn't support this option. Try again 630 * without MAP_ALIGN. 631 */ 632 if (fmap->fm_mflags & MAP_ALIGN) { 633 rtld_flags2 |= RT_FL2_NOMALIGN; 634 fmap_setup(); 635 636 maddr = (char *)mmap(fmap->fm_maddr, fmap->fm_msize, 637 (PROT_READ | PROT_EXEC), fmap->fm_mflags, fd, 0); 638 } 639 } 640 #endif 641 if (maddr == MAP_FAILED) { 642 rej->rej_type = SGS_REJ_STR; 643 rej->rej_str = strerror(errno); 644 return (0); 645 } 646 647 /* 648 * From now on we will re-use fmap->fm_maddr as the mapping address 649 * so we augment the flags with MAP_FIXED and drop any MAP_ALIGN. 650 */ 651 fmap->fm_maddr = maddr; 652 fmap->fm_mflags |= MAP_FIXED; 653 #if defined(MAP_ALIGN) 654 fmap->fm_mflags &= ~MAP_ALIGN; 655 #endif 656 657 /* 658 * Search through the object vectors to determine what kind of 659 * object we have. 660 */ 661 for (i = 0; vector[i]; i++) { 662 if ((vector[i]->fct_are_u_this)(rej)) 663 return (vector[i]); 664 else if (rej->rej_type) { 665 Rt_map *lmp; 666 667 /* 668 * If this object is an explicitly defined shared 669 * object under inspection by ldd, and contains a 670 * incompatible hardware capabilities requirement, then 671 * inform the user, but continue processing. 672 * 673 * XXXX - ldd -v for any rej failure. 674 */ 675 if ((rej->rej_type == SGS_REJ_HWCAP_1) && 676 (lml_main.lm_flags & LML_FLG_TRC_LDDSTUB) && 677 ((lmp = lml_main.lm_head) != 0) && 678 (FLAGS1(lmp) & FL1_RT_LDDSTUB) && 679 (NEXT(lmp) == 0)) { 680 (void) printf(MSG_INTL(MSG_LDD_GEN_HWCAP_1), 681 name, rej->rej_str); 682 return (vector[i]); 683 } 684 return (0); 685 } 686 } 687 688 /* 689 * Unknown file type. 690 */ 691 rej->rej_type = SGS_REJ_UNKFILE; 692 return (0); 693 } 694 695 /* 696 * Helper routine for is_so_matched() that consolidates matching a path name, 697 * or file name component of a link-map name. 698 */ 699 static int 700 _is_so_matched(const char *name, const char *str, int path) 701 { 702 const char *_str; 703 704 if ((path == 0) && ((_str = strrchr(str, '/')) != NULL)) 705 _str++; 706 else 707 _str = str; 708 709 return (strcmp(name, _str)); 710 } 711 712 /* 713 * Determine whether a search name matches one of the names associated with a 714 * link-map. A link-map contains several names: 715 * 716 * . a NAME() - typically the full pathname of an object that has been 717 * loaded. For example, when looking for the dependency "libc.so.1", a 718 * search path is applied, with the eventual NAME() being "/lib/ld.so.1". 719 * The name of the executable is typically a simple filename, such as 720 * "main", as this is the name passed to exec() to start the process. 721 * 722 * . a PATHNAME() - this is maintained if the resolved NAME() is different 723 * to NAME(), ie. the original name is a symbolic link. This is also 724 * the resolved full pathname for a dynamic executable. 725 * 726 * . a list of ALIAS() names - these are alternative names by which the 727 * object has been found, ie. when dependencies are loaded through a 728 * variety of different symbolic links. 729 * 730 * The name pattern matching can differ depending on whether we are looking 731 * for a full path name (path != 0), or a simple file name (path == 0). Full 732 * path names typically match NAME() or PATHNAME() entries, so these link-map 733 * names are inspected first when a full path name is being searched for. 734 * Simple file names typically match ALIAS() names, so these link-map names are 735 * inspected first when a simple file name is being searched for. 736 * 737 * For all full path name searches, the link-map names are taken as is. For 738 * simple file name searches, only the file name component of any link-map 739 * names are used for comparison. 740 */ 741 static Rt_map * 742 is_so_matched(Rt_map *lmp, const char *name, int path) 743 { 744 Aliste off; 745 const char **cpp; 746 747 /* 748 * A pathname is typically going to match a NAME() or PATHNAME(), so 749 * check these first. 750 */ 751 if (path) { 752 if (strcmp(name, NAME(lmp)) == 0) 753 return (lmp); 754 755 if (PATHNAME(lmp) != NAME(lmp)) { 756 if (strcmp(name, PATHNAME(lmp)) == 0) 757 return (lmp); 758 } 759 } 760 761 /* 762 * Typically, dependencies are specified as simple file names 763 * (DT_NEEDED == libc.so.1), which are expanded to full pathnames to 764 * open the file. The full pathname is NAME(), and the original name 765 * is maintained on the ALIAS() list. 766 * 767 * If this is a simple filename, or a pathname has failed to match the 768 * NAME() and PATHNAME() check above, look through the ALIAS() list. 769 */ 770 for (ALIST_TRAVERSE(ALIAS(lmp), off, cpp)) { 771 /* 772 * If we're looking for a simple filename, _is_so_matched() 773 * will reduce the ALIAS name to its simple name. 774 */ 775 if (_is_so_matched(name, *cpp, path) == 0) 776 return (lmp); 777 } 778 779 /* 780 * Finally, if this is a simple file name, and any ALIAS() search has 781 * been completed, match the simple file name of NAME() and PATHNAME(). 782 */ 783 if (path == 0) { 784 if (_is_so_matched(name, NAME(lmp), 0) == 0) 785 return (lmp); 786 787 if (PATHNAME(lmp) != NAME(lmp)) { 788 if (_is_so_matched(name, PATHNAME(lmp), 0) == 0) 789 return (lmp); 790 } 791 } 792 793 return (0); 794 } 795 796 /* 797 * Files are opened by ld.so.1 to satisfy dependencies, filtees and dlopen() 798 * requests. Each request investigates the file based upon the callers 799 * environment, and once a full path name has been established a check is made 800 * against the FullpathNode AVL tree and a device/inode check, to ensure the 801 * same file isn't mapped multiple times. See file_open(). 802 * 803 * However, there are one of two cases where a test for an existing file name 804 * needs to be carried out, such as dlopen(NOLOAD) requests, dldump() requests, 805 * and as a final fallback to dependency loading. These requests are handled 806 * by is_so_loaded(). 807 * 808 * A traversal through the callers link-map list is carried out, and from each 809 * link-map, a comparison is made against all of the various names by which the 810 * object has been referenced. The subroutine, is_so_matched() compares the 811 * link-map names against the name being searched for. Whether the search name 812 * is a full path name or a simple file name, governs what comparisons are made. 813 * 814 * A full path name, which is a fully resolved path name that starts with a "/" 815 * character, or a relative path name that includes a "/" character, must match 816 * the link-map names explicitly. A simple file name, which is any name *not* 817 * containing a "/" character, are matched against the file name component of 818 * any link-map names. 819 */ 820 Rt_map * 821 is_so_loaded(Lm_list *lml, const char *name) 822 { 823 Rt_map *lmp; 824 avl_index_t where; 825 Lm_cntl *lmc; 826 Aliste off; 827 int path = 0; 828 829 /* 830 * If the name is a full path name, first determine if the path name is 831 * registered in the FullpathNode AVL tree. 832 */ 833 if ((name[0] == '/') && 834 ((lmp = fpavl_loaded(lml, name, &where)) != NULL) && 835 ((FLAGS(lmp) & (FLG_RT_OBJECT | FLG_RT_DELETE)) == 0)) 836 return (lmp); 837 838 /* 839 * Determine whether the name is a simple file name, or a path name. 840 */ 841 if (strchr(name, '/')) 842 path++; 843 844 /* 845 * Loop through the callers link-map lists. 846 */ 847 for (ALIST_TRAVERSE(lml->lm_lists, off, lmc)) { 848 for (lmp = lmc->lc_head; lmp; lmp = (Rt_map *)NEXT(lmp)) { 849 if (FLAGS(lmp) & (FLG_RT_OBJECT | FLG_RT_DELETE)) 850 continue; 851 852 if (is_so_matched(lmp, name, path)) 853 return (lmp); 854 } 855 } 856 return ((Rt_map *)0); 857 } 858 859 /* 860 * Tracing is enabled by the LD_TRACE_LOADED_OPTIONS environment variable which 861 * is normally set from ldd(1). For each link map we load, print the load name 862 * and the full pathname of the shared object. 863 */ 864 /* ARGSUSED4 */ 865 static void 866 trace_so(Rt_map *clmp, Rej_desc *rej, const char *name, const char *path, 867 int alter, const char *nfound) 868 { 869 const char *str = MSG_ORIG(MSG_STR_EMPTY); 870 const char *reject = MSG_ORIG(MSG_STR_EMPTY); 871 char _reject[PATH_MAX]; 872 873 /* 874 * The first time through trace_so() will only have lddstub on the 875 * link-map list and the preloaded shared object is supplied as "path". 876 * As we don't want to print this shared object as a dependency, but 877 * instead inspect *its* dependencies, return. 878 */ 879 if (FLAGS1(clmp) & FL1_RT_LDDSTUB) 880 return; 881 882 /* 883 * Without any rejection info, this is a supplied not-found condition. 884 */ 885 if (rej && (rej->rej_type == 0)) { 886 (void) printf(nfound, name); 887 return; 888 } 889 890 /* 891 * If rejection information exists then establish what object was 892 * found and the reason for its rejection. 893 */ 894 if (rej) { 895 Conv_reject_desc_buf_t rej_buf; 896 897 /* LINTED */ 898 (void) snprintf(_reject, PATH_MAX, 899 MSG_INTL(ldd_reject[rej->rej_type]), 900 conv_reject_desc(rej, &rej_buf)); 901 if (rej->rej_name) 902 path = rej->rej_name; 903 reject = (char *)_reject; 904 905 /* 906 * Was an alternative pathname defined (from a configuration 907 * file). 908 */ 909 if (rej->rej_flag & FLG_FD_ALTER) 910 str = MSG_INTL(MSG_LDD_FIL_ALTER); 911 } else { 912 if (alter) 913 str = MSG_INTL(MSG_LDD_FIL_ALTER); 914 } 915 916 /* 917 * If the load name isn't a full pathname print its associated pathname 918 * together with all the other information we've gathered. 919 */ 920 if (*name == '/') 921 (void) printf(MSG_ORIG(MSG_LDD_FIL_PATH), path, str, reject); 922 else 923 (void) printf(MSG_ORIG(MSG_LDD_FIL_EQUIV), name, path, str, 924 reject); 925 } 926 927 928 /* 929 * Establish a link-map mode, initializing it if it has just been loaded, or 930 * potentially updating it if it already exists. 931 */ 932 int 933 update_mode(Rt_map *lmp, int omode, int nmode) 934 { 935 Lm_list *lml = LIST(lmp); 936 int pmode = 0; 937 938 /* 939 * A newly loaded object hasn't had its mode set yet. Modes are used to 940 * load dependencies, so don't propagate any parent or no-load flags, as 941 * these would adversely affect this objects ability to load any of its 942 * dependencies that aren't already loaded. RTLD_FIRST is applicable to 943 * this objects handle creation only, and should not be propagated. 944 */ 945 if ((FLAGS(lmp) & FLG_RT_MODESET) == 0) { 946 MODE(lmp) |= nmode & ~(RTLD_PARENT | RTLD_NOLOAD | RTLD_FIRST); 947 FLAGS(lmp) |= FLG_RT_MODESET; 948 return (1); 949 } 950 951 /* 952 * Establish any new overriding modes. RTLD_LAZY and RTLD_NOW should be 953 * represented individually (this is historic, as these two flags were 954 * the only flags originally available to dlopen()). Other flags are 955 * accumulative, but have a hierarchy of preference. 956 */ 957 if ((omode & RTLD_LAZY) && (nmode & RTLD_NOW)) { 958 MODE(lmp) &= ~RTLD_LAZY; 959 pmode |= RTLD_NOW; 960 } 961 962 pmode |= ((~omode & nmode) & 963 (RTLD_GLOBAL | RTLD_WORLD | RTLD_NODELETE)); 964 if (pmode) { 965 DBG_CALL(Dbg_file_mode_promote(lmp, pmode)); 966 MODE(lmp) |= pmode; 967 } 968 969 /* 970 * If this load is an RTLD_NOW request and the object has already been 971 * loaded non-RTLD_NOW, append this object to the relocation-now list 972 * of the objects associated control list. Note, if the object hasn't 973 * yet been relocated, setting its MODE() to RTLD_NOW will establish 974 * full relocation processing when it eventually gets relocated. 975 */ 976 if ((pmode & RTLD_NOW) && 977 (FLAGS(lmp) & (FLG_RT_RELOCED | FLG_RT_RELOCING))) { 978 Lm_cntl *lmc; 979 980 /* LINTED */ 981 lmc = (Lm_cntl *)((char *)(LIST(lmp)->lm_lists) + CNTL(lmp)); 982 (void) alist_append(&(lmc->lc_now), &lmp, sizeof (Rt_map *), 983 AL_CNT_LMNOW); 984 } 985 986 #ifdef SIEBEL_DISABLE 987 /* 988 * For patch backward compatibility the following .init collection 989 * is disabled. 990 */ 991 if (rtld_flags & RT_FL_DISFIX_1) 992 return (pmode); 993 #endif 994 995 /* 996 * If this objects .init has been collected but has not yet been called, 997 * it may be necessary to reevaluate the object using tsort(). For 998 * example, a new dlopen() hierarchy may bind to uninitialized objects 999 * that are already loaded, or a dlopen(RTLD_NOW) can establish new 1000 * bindings between already loaded objects that require the tsort() 1001 * information be recomputed. If however, no new objects have been 1002 * added to the process, and this object hasn't been promoted, don't 1003 * bother reevaluating the .init. The present tsort() information is 1004 * probably as accurate as necessary, and by not establishing a parallel 1005 * tsort() we can help reduce the amount of recursion possible between 1006 * .inits. 1007 */ 1008 if (((FLAGS(lmp) & 1009 (FLG_RT_INITCLCT | FLG_RT_INITCALL)) == FLG_RT_INITCLCT) && 1010 ((lml->lm_flags & LML_FLG_OBJADDED) || ((pmode & RTLD_NOW) && 1011 (FLAGS(lmp) & (FLG_RT_RELOCED | FLG_RT_RELOCING))))) { 1012 FLAGS(lmp) &= ~FLG_RT_INITCLCT; 1013 LIST(lmp)->lm_init++; 1014 LIST(lmp)->lm_flags |= LML_FLG_OBJREEVAL; 1015 } 1016 1017 return (pmode); 1018 } 1019 1020 /* 1021 * Determine whether an alias name already exists, and if not create one. This 1022 * is typically used to retain dependency names, such as "libc.so.1", which 1023 * would have been expanded to full path names when they were loaded. The 1024 * full path names (NAME() and possibly PATHNAME()) are maintained as Fullpath 1025 * AVL nodes, and thus would have been matched by fpavl_loaded() during 1026 * file_open(). 1027 */ 1028 int 1029 append_alias(Rt_map *lmp, const char *str, int *added) 1030 { 1031 Aliste off; 1032 char **cpp, *cp; 1033 1034 /* 1035 * Determine if this filename is already on the alias list. 1036 */ 1037 for (ALIST_TRAVERSE(ALIAS(lmp), off, cpp)) { 1038 if (strcmp(*cpp, str) == 0) 1039 return (1); 1040 } 1041 1042 /* 1043 * This is a new alias, append it to the alias list. 1044 */ 1045 if ((cp = strdup(str)) == NULL) 1046 return (0); 1047 1048 if (alist_append(&ALIAS(lmp), &cp, sizeof (char *), 1049 AL_CNT_ALIAS) == 0) { 1050 free(cp); 1051 return (0); 1052 } 1053 if (added) 1054 *added = 1; 1055 return (1); 1056 } 1057 1058 /* 1059 * Determine whether a file is already loaded by comparing device and inode 1060 * values. 1061 */ 1062 static Rt_map * 1063 is_devinode_loaded(struct stat *status, Lm_list *lml, const char *name, 1064 uint_t flags) 1065 { 1066 Lm_cntl *lmc; 1067 Aliste off; 1068 1069 /* 1070 * If this is an auditor, it will have been opened on a new link-map. 1071 * To prevent multiple occurrances of the same auditor on multiple 1072 * link-maps, search the head of each link-map list and see if this 1073 * object is already loaded as an auditor. 1074 */ 1075 if (flags & FLG_RT_AUDIT) { 1076 Lm_list * lml; 1077 Listnode * lnp; 1078 1079 for (LIST_TRAVERSE(&dynlm_list, lnp, lml)) { 1080 Rt_map *nlmp = lml->lm_head; 1081 1082 if (nlmp && ((FLAGS(nlmp) & 1083 (FLG_RT_AUDIT | FLG_RT_DELETE)) == FLG_RT_AUDIT) && 1084 (STDEV(nlmp) == status->st_dev) && 1085 (STINO(nlmp) == status->st_ino)) 1086 return (nlmp); 1087 } 1088 return ((Rt_map *)0); 1089 } 1090 1091 /* 1092 * If the file has been found determine from the new files status 1093 * information if this file is actually linked to one we already have 1094 * mapped. This catches symlink names not caught by is_so_loaded(). 1095 */ 1096 for (ALIST_TRAVERSE(lml->lm_lists, off, lmc)) { 1097 Rt_map *nlmp; 1098 1099 for (nlmp = lmc->lc_head; nlmp; nlmp = (Rt_map *)NEXT(nlmp)) { 1100 if ((FLAGS(nlmp) & FLG_RT_DELETE) || 1101 (FLAGS1(nlmp) & FL1_RT_LDDSTUB)) 1102 continue; 1103 1104 if ((STDEV(nlmp) != status->st_dev) || 1105 (STINO(nlmp) != status->st_ino)) 1106 continue; 1107 1108 if (lml->lm_flags & LML_FLG_TRC_VERBOSE) { 1109 /* BEGIN CSTYLED */ 1110 if (*name == '/') 1111 (void) printf(MSG_ORIG(MSG_LDD_FIL_PATH), 1112 name, MSG_ORIG(MSG_STR_EMPTY), 1113 MSG_ORIG(MSG_STR_EMPTY)); 1114 else 1115 (void) printf(MSG_ORIG(MSG_LDD_FIL_EQUIV), 1116 name, NAME(nlmp), 1117 MSG_ORIG(MSG_STR_EMPTY), 1118 MSG_ORIG(MSG_STR_EMPTY)); 1119 /* END CSTYLED */ 1120 } 1121 return (nlmp); 1122 } 1123 } 1124 return ((Rt_map *)0); 1125 } 1126 1127 /* 1128 * Generate any error messages indicating a file could not be found. When 1129 * preloading or auditing a secure application, it can be a little more helpful 1130 * to indicate that a search of secure directories has failed, so adjust the 1131 * messages accordingly. 1132 */ 1133 void 1134 file_notfound(Lm_list *lml, const char *name, Rt_map *clmp, uint_t flags, 1135 Rej_desc * rej) 1136 { 1137 int secure = 0; 1138 1139 if ((rtld_flags & RT_FL_SECURE) && 1140 (flags & (FLG_RT_PRELOAD | FLG_RT_AUDIT))) 1141 secure++; 1142 1143 if (lml->lm_flags & LML_FLG_TRC_ENABLE) { 1144 /* 1145 * Under ldd(1), auxiliary filtees that can't be loaded are 1146 * ignored, unless verbose errors are requested. 1147 */ 1148 if ((rtld_flags & RT_FL_SILENCERR) && 1149 ((lml->lm_flags & LML_FLG_TRC_VERBOSE) == 0)) 1150 return; 1151 1152 if (secure) 1153 trace_so(clmp, rej, name, 0, 0, 1154 MSG_INTL(MSG_LDD_SEC_NFOUND)); 1155 else 1156 trace_so(clmp, rej, name, 0, 0, 1157 MSG_INTL(MSG_LDD_FIL_NFOUND)); 1158 return; 1159 } 1160 1161 if (rej->rej_type) { 1162 Conv_reject_desc_buf_t rej_buf; 1163 1164 eprintf(lml, ERR_FATAL, MSG_INTL(err_reject[rej->rej_type]), 1165 rej->rej_name ? rej->rej_name : MSG_INTL(MSG_STR_UNKNOWN), 1166 conv_reject_desc(rej, &rej_buf)); 1167 return; 1168 } 1169 1170 if (secure) 1171 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_SEC_OPEN), name); 1172 else 1173 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_SYS_OPEN), name, 1174 strerror(ENOENT)); 1175 } 1176 1177 static int 1178 file_open(int err, Lm_list *lml, const char *oname, const char *nname, 1179 Rt_map *clmp, uint_t flags, Fdesc *fdesc, Rej_desc *rej) 1180 { 1181 struct stat status; 1182 Rt_map *nlmp; 1183 int resolved = 0; 1184 1185 fdesc->fd_oname = oname; 1186 1187 if ((err == 0) && (fdesc->fd_flags & FLG_FD_ALTER)) 1188 DBG_CALL(Dbg_file_config_obj(lml, oname, 0, nname)); 1189 1190 /* 1191 * If we're dealing with a full pathname, determine whether this 1192 * pathname is already known. Other pathnames fall through to the 1193 * dev/inode check, as even though the pathname may look the same as 1194 * one previously used, the process may have changed directory. 1195 */ 1196 if ((err == 0) && (nname[0] == '/')) { 1197 if ((nlmp = fpavl_loaded(lml, nname, 1198 &(fdesc->fd_avlwhere))) != NULL) { 1199 fdesc->fd_nname = nname; 1200 fdesc->fd_lmp = nlmp; 1201 return (1); 1202 } 1203 } 1204 1205 if ((err == 0) && ((stat(nname, &status)) != -1)) { 1206 char path[PATH_MAX]; 1207 int fd, size, added; 1208 1209 /* 1210 * If this path has been constructed as part of expanding a 1211 * HWCAP directory, ignore any subdirectories. As this is a 1212 * silent failure, where no rejection message is created, free 1213 * the original name to simplify the life of the caller. For 1214 * any other reference that expands to a directory, fall through 1215 * to contruct a meaningful rejection message. 1216 */ 1217 if ((flags & FLG_RT_HWCAP) && 1218 ((status.st_mode & S_IFMT) == S_IFDIR)) { 1219 free((void *)nname); 1220 return (0); 1221 } 1222 1223 /* 1224 * Resolve the filename and determine whether the resolved name 1225 * is already known. Typically, the previous fpavl_loaded() 1226 * will have caught this, as both NAME() and PATHNAME() for a 1227 * link-map are recorded in the FullNode AVL tree. However, 1228 * instances exist where a file can be replaced (loop-back 1229 * mounts, bfu, etc.), and reference is made to the original 1230 * file through a symbolic link. By checking the pathname here, 1231 * we don't fall through to the dev/inode check and conclude 1232 * that a new file should be loaded. 1233 */ 1234 if ((nname[0] == '/') && (rtld_flags & RT_FL_EXECNAME) && 1235 ((size = resolvepath(nname, path, (PATH_MAX - 1))) > 0)) { 1236 path[size] = '\0'; 1237 1238 if (strcmp(nname, path)) { 1239 if ((nlmp = 1240 fpavl_loaded(lml, path, 0)) != NULL) { 1241 added = 0; 1242 1243 if (append_alias(nlmp, nname, 1244 &added) == 0) 1245 return (0); 1246 /* BEGIN CSTYLED */ 1247 if (added) 1248 DBG_CALL(Dbg_file_skip(LIST(clmp), 1249 NAME(nlmp), nname)); 1250 /* END CSTYLED */ 1251 fdesc->fd_nname = nname; 1252 fdesc->fd_lmp = nlmp; 1253 return (1); 1254 } 1255 1256 /* 1257 * If this pathname hasn't been loaded, save 1258 * the resolved pathname so that it doesn't 1259 * have to be recomputed as part of fullpath() 1260 * processing. 1261 */ 1262 if ((fdesc->fd_pname = strdup(path)) == NULL) 1263 return (0); 1264 resolved = 1; 1265 } else { 1266 /* 1267 * If the resolved name doesn't differ from the 1268 * original, save it without duplication. 1269 * Having fd_pname set indicates that no further 1270 * resolvepath processing is necessary. 1271 */ 1272 fdesc->fd_pname = nname; 1273 } 1274 } 1275 1276 if (nlmp = is_devinode_loaded(&status, lml, nname, flags)) { 1277 if (flags & FLG_RT_AUDIT) { 1278 /* 1279 * If we've been requested to load an auditor, 1280 * and an auditor of the same name already 1281 * exists, then the original auditor is used. 1282 */ 1283 DBG_CALL(Dbg_audit_skip(LIST(clmp), 1284 NAME(nlmp), LIST(nlmp)->lm_lmidstr)); 1285 } else { 1286 /* 1287 * Otherwise, if an alternatively named file 1288 * has been found for the same dev/inode, add 1289 * a new name alias, and insert any alias full 1290 * pathname in the link-map lists AVL tree. 1291 */ 1292 added = 0; 1293 1294 if (append_alias(nlmp, nname, &added) == 0) 1295 return (0); 1296 if (added) { 1297 if ((nname[0] == '/') && 1298 (fpavl_insert(lml, nlmp, 1299 nname, 0) == 0)) 1300 return (0); 1301 DBG_CALL(Dbg_file_skip(LIST(clmp), 1302 NAME(nlmp), nname)); 1303 } 1304 } 1305 1306 /* 1307 * Record in the file descriptor the existing object 1308 * that satisfies this open request. 1309 */ 1310 fdesc->fd_nname = nname; 1311 fdesc->fd_lmp = nlmp; 1312 return (1); 1313 } 1314 1315 if ((fd = open(nname, O_RDONLY, 0)) == -1) { 1316 /* 1317 * As the file must exist for the previous stat() to 1318 * have succeeded, record the error condition. 1319 */ 1320 rej->rej_type = SGS_REJ_STR; 1321 rej->rej_str = strerror(errno); 1322 } else { 1323 Fct *ftp; 1324 1325 if ((ftp = are_u_this(rej, fd, &status, nname)) != 0) { 1326 fdesc->fd_nname = nname; 1327 fdesc->fd_ftp = ftp; 1328 fdesc->fd_dev = status.st_dev; 1329 fdesc->fd_ino = status.st_ino; 1330 fdesc->fd_fd = fd; 1331 1332 /* 1333 * Trace that this open has succeeded. 1334 */ 1335 if (lml->lm_flags & LML_FLG_TRC_ENABLE) { 1336 trace_so(clmp, 0, oname, nname, 1337 (fdesc->fd_flags & FLG_FD_ALTER), 1338 0); 1339 } 1340 return (1); 1341 } 1342 (void) close(fd); 1343 } 1344 1345 } else if (errno != ENOENT) { 1346 /* 1347 * If the open() failed for anything other than the file not 1348 * existing, record the error condition. 1349 */ 1350 rej->rej_type = SGS_REJ_STR; 1351 rej->rej_str = strerror(errno); 1352 } 1353 1354 /* 1355 * Indicate any rejection. 1356 */ 1357 if (rej->rej_type) { 1358 /* 1359 * If this pathname was resolved and duplicated, remove the 1360 * allocated name to simplify the cleanup of the callers. 1361 */ 1362 if (resolved) { 1363 free((void *)fdesc->fd_pname); 1364 fdesc->fd_pname = NULL; 1365 } 1366 rej->rej_name = nname; 1367 rej->rej_flag = (fdesc->fd_flags & FLG_FD_ALTER); 1368 DBG_CALL(Dbg_file_rejected(lml, rej)); 1369 } 1370 return (0); 1371 } 1372 1373 /* 1374 * Find a full pathname (it contains a "/"). 1375 */ 1376 int 1377 find_path(Lm_list *lml, const char *oname, Rt_map *clmp, uint_t flags, 1378 Fdesc *fdesc, Rej_desc *rej) 1379 { 1380 int err = 0; 1381 1382 /* 1383 * If directory configuration exists determine if this path is known. 1384 */ 1385 if (rtld_flags & RT_FL_DIRCFG) { 1386 Rtc_obj *obj; 1387 const char *aname; 1388 1389 if ((obj = elf_config_ent(oname, (Word)elf_hash(oname), 1390 0, &aname)) != 0) { 1391 /* 1392 * If the configuration file states that this path is a 1393 * directory, or the path is explicitly defined as 1394 * non-existent (ie. a unused platform specific 1395 * library), then go no further. 1396 */ 1397 if (obj->co_flags & RTC_OBJ_DIRENT) { 1398 err = EISDIR; 1399 } else if ((obj->co_flags & 1400 (RTC_OBJ_NOEXIST | RTC_OBJ_ALTER)) == 1401 RTC_OBJ_NOEXIST) { 1402 err = ENOENT; 1403 } else if ((obj->co_flags & RTC_OBJ_ALTER) && 1404 (rtld_flags & RT_FL_OBJALT) && (lml == &lml_main)) { 1405 int ret; 1406 1407 fdesc->fd_flags |= FLG_FD_ALTER; 1408 /* 1409 * Attempt to open the alternative path. If 1410 * this fails, and the alternative is flagged 1411 * as optional, fall through to open the 1412 * original path. 1413 */ 1414 DBG_CALL(Dbg_libs_found(lml, aname, 1415 FLG_FD_ALTER)); 1416 if (((ret = file_open(0, lml, oname, aname, 1417 clmp, flags, fdesc, rej)) != 0) || 1418 ((obj->co_flags & RTC_OBJ_OPTINAL) == 0)) 1419 return (ret); 1420 1421 fdesc->fd_flags &= ~FLG_FD_ALTER; 1422 } 1423 } 1424 } 1425 DBG_CALL(Dbg_libs_found(lml, oname, 0)); 1426 return (file_open(err, lml, oname, oname, clmp, flags, fdesc, rej)); 1427 } 1428 1429 /* 1430 * Find a simple filename (it doesn't contain a "/"). 1431 */ 1432 static int 1433 _find_file(Lm_list *lml, const char *oname, const char *nname, Rt_map *clmp, 1434 uint_t flags, Fdesc *fdesc, Rej_desc *rej, Pnode *dir, int aflag) 1435 { 1436 DBG_CALL(Dbg_libs_found(lml, nname, aflag)); 1437 if ((lml->lm_flags & LML_FLG_TRC_SEARCH) && 1438 ((FLAGS1(clmp) & FL1_RT_LDDSTUB) == 0)) { 1439 (void) printf(MSG_INTL(MSG_LDD_PTH_TRYING), nname, aflag ? 1440 MSG_INTL(MSG_LDD_FIL_ALTER) : MSG_ORIG(MSG_STR_EMPTY)); 1441 } 1442 1443 /* 1444 * If we're being audited tell the audit library of the file we're about 1445 * to go search for. The audit library may offer an alternative 1446 * dependency, or indicate that this dependency should be ignored. 1447 */ 1448 if ((lml->lm_tflags | FLAGS1(clmp)) & LML_TFLG_AUD_OBJSEARCH) { 1449 char *aname = audit_objsearch(clmp, nname, dir->p_orig); 1450 1451 if (aname == 0) { 1452 DBG_CALL(Dbg_audit_terminate(lml, nname)); 1453 return (0); 1454 } 1455 1456 /* 1457 * Protect ourselves from auditor mischief, by copying any 1458 * alternative name over the present name (the present name is 1459 * maintained in a static buffer - see elf_get_so()); 1460 */ 1461 if (nname != aname) 1462 (void) strncpy((char *)nname, aname, PATH_MAX); 1463 } 1464 return (file_open(0, lml, oname, nname, clmp, flags, fdesc, rej)); 1465 } 1466 1467 static int 1468 find_file(Lm_list *lml, const char *oname, Rt_map *clmp, uint_t flags, 1469 Fdesc *fdesc, Rej_desc *rej, Pnode *dir, Word * strhash, size_t olen) 1470 { 1471 static Rtc_obj Obj = { 0 }; 1472 Rtc_obj * dobj; 1473 const char *nname = oname; 1474 1475 if (dir->p_name == 0) 1476 return (0); 1477 if (dir->p_info) { 1478 dobj = (Rtc_obj *)dir->p_info; 1479 if ((dobj->co_flags & 1480 (RTC_OBJ_NOEXIST | RTC_OBJ_ALTER)) == RTC_OBJ_NOEXIST) 1481 return (0); 1482 } else 1483 dobj = 0; 1484 1485 /* 1486 * If configuration information exists see if this directory/file 1487 * combination exists. 1488 */ 1489 if ((rtld_flags & RT_FL_DIRCFG) && 1490 ((dobj == 0) || (dobj->co_id != 0))) { 1491 Rtc_obj *fobj; 1492 const char *alt = 0; 1493 1494 /* 1495 * If this pnode has not yet been searched for in the 1496 * configuration file go find it. 1497 */ 1498 if (dobj == 0) { 1499 dobj = elf_config_ent(dir->p_name, 1500 (Word)elf_hash(dir->p_name), 0, 0); 1501 if (dobj == 0) 1502 dobj = &Obj; 1503 dir->p_info = (void *)dobj; 1504 1505 if ((dobj->co_flags & (RTC_OBJ_NOEXIST | 1506 RTC_OBJ_ALTER)) == RTC_OBJ_NOEXIST) 1507 return (0); 1508 } 1509 1510 /* 1511 * If we found a directory search for the file. 1512 */ 1513 if (dobj->co_id != 0) { 1514 if (*strhash == 0) 1515 *strhash = (Word)elf_hash(nname); 1516 fobj = elf_config_ent(nname, *strhash, 1517 dobj->co_id, &alt); 1518 1519 /* 1520 * If this object specifically does not exist, or the 1521 * object can't be found in a know-all-entries 1522 * directory, continue looking. If the object does 1523 * exist determine if an alternative object exists. 1524 */ 1525 if (fobj == 0) { 1526 if (dobj->co_flags & RTC_OBJ_ALLENTS) 1527 return (0); 1528 } else { 1529 if ((fobj->co_flags & (RTC_OBJ_NOEXIST | 1530 RTC_OBJ_ALTER)) == RTC_OBJ_NOEXIST) 1531 return (0); 1532 1533 if ((fobj->co_flags & RTC_OBJ_ALTER) && 1534 (rtld_flags & RT_FL_OBJALT) && 1535 (lml == &lml_main)) { 1536 int ret; 1537 1538 fdesc->fd_flags |= FLG_FD_ALTER; 1539 /* 1540 * Attempt to open the alternative path. 1541 * If this fails, and the alternative is 1542 * flagged as optional, fall through to 1543 * open the original path. 1544 */ 1545 ret = _find_file(lml, oname, alt, clmp, 1546 flags, fdesc, rej, dir, 1); 1547 if (ret || ((fobj->co_flags & 1548 RTC_OBJ_OPTINAL) == 0)) 1549 return (ret); 1550 1551 fdesc->fd_flags &= ~FLG_FD_ALTER; 1552 } 1553 } 1554 } 1555 } 1556 1557 /* 1558 * Protect ourselves from building an invalid pathname. 1559 */ 1560 if ((olen + dir->p_len + 1) >= PATH_MAX) { 1561 eprintf(lml, ERR_FATAL, MSG_INTL(MSG_SYS_OPEN), nname, 1562 strerror(ENAMETOOLONG)); 1563 return (0); 1564 } 1565 if ((nname = (LM_GET_SO(clmp)(dir->p_name, nname))) == 0) 1566 return (0); 1567 1568 return (_find_file(lml, oname, nname, clmp, flags, fdesc, rej, dir, 0)); 1569 } 1570 1571 /* 1572 * A unique file has been opened. Create a link-map to represent it, and 1573 * process the various names by which it can be referenced. 1574 */ 1575 static Rt_map * 1576 load_file(Lm_list *lml, Aliste lmco, Fdesc *fdesc) 1577 { 1578 const char *oname = fdesc->fd_oname; 1579 const char *nname = fdesc->fd_nname; 1580 Rt_map *nlmp; 1581 1582 /* 1583 * Typically we call fct_map_so() with the full pathname of the opened 1584 * file (nname) and the name that started the search (oname), thus for 1585 * a typical dependency on libc this would be /usr/lib/libc.so.1 and 1586 * libc.so.1 (DT_NEEDED). The original name is maintained on an ALIAS 1587 * list for comparison when bringing in new dependencies. If the user 1588 * specified name as a full path (from a dlopen() for example) then 1589 * there's no need to create an ALIAS. 1590 */ 1591 if (strcmp(oname, nname) == 0) 1592 oname = 0; 1593 1594 /* 1595 * A new file has been opened, now map it into the process. Close the 1596 * original file so as not to accumulate file descriptors. 1597 */ 1598 nlmp = ((fdesc->fd_ftp)->fct_map_so)(lml, lmco, nname, oname, 1599 fdesc->fd_fd); 1600 (void) close(fdesc->fd_fd); 1601 fdesc->fd_fd = 0; 1602 1603 if (nlmp == 0) 1604 return (0); 1605 1606 /* 1607 * Save the dev/inode information for later comparisons. 1608 */ 1609 STDEV(nlmp) = fdesc->fd_dev; 1610 STINO(nlmp) = fdesc->fd_ino; 1611 1612 /* 1613 * Insert the names of this link-map into the FullpathNode AVL tree. 1614 * Save both the NAME() and PATHNAME() is they differ. 1615 * 1616 * If this is an OBJECT file, don't insert it yet as this is only a 1617 * temporary link-map. During elf_obj_fini() the final link-map is 1618 * created, and its names will be inserted in the FullpathNode AVL 1619 * tree at that time. 1620 */ 1621 if ((FLAGS(nlmp) & FLG_RT_OBJECT) == 0) { 1622 /* 1623 * Update the objects full path information if necessary. 1624 * Note, with pathname expansion in effect, the fd_pname will 1625 * be used as PATHNAME(). This allocated string will be freed 1626 * should this object be deleted. However, without pathname 1627 * expansion, the fd_name should be freed now, as it is no 1628 * longer referenced. 1629 */ 1630 if (FLAGS1(nlmp) & FL1_RT_RELATIVE) 1631 (void) fullpath(nlmp, fdesc->fd_pname); 1632 else if (fdesc->fd_pname != fdesc->fd_nname) 1633 free((void *)fdesc->fd_pname); 1634 fdesc->fd_pname = 0; 1635 1636 if ((NAME(nlmp)[0] == '/') && (fpavl_insert(lml, nlmp, 1637 NAME(nlmp), fdesc->fd_avlwhere) == 0)) { 1638 remove_so(lml, nlmp); 1639 return (0); 1640 } 1641 if (((NAME(nlmp)[0] != '/') || 1642 (NAME(nlmp) != PATHNAME(nlmp))) && 1643 (fpavl_insert(lml, nlmp, PATHNAME(nlmp), 0) == 0)) { 1644 remove_so(lml, nlmp); 1645 return (0); 1646 } 1647 } 1648 1649 /* 1650 * If we're processing an alternative object reset the original name 1651 * for possible $ORIGIN processing. 1652 */ 1653 if (fdesc->fd_flags & FLG_FD_ALTER) { 1654 const char *odir; 1655 char *ndir; 1656 size_t olen; 1657 1658 FLAGS(nlmp) |= FLG_RT_ALTER; 1659 1660 /* 1661 * If we were given a pathname containing a slash then the 1662 * original name is still in oname. Otherwise the original 1663 * directory is in dir->p_name (which is all we need for 1664 * $ORIGIN). 1665 */ 1666 if (fdesc->fd_flags & FLG_FD_SLASH) { 1667 char *ofil; 1668 1669 odir = oname; 1670 ofil = strrchr(oname, '/'); 1671 olen = ofil - odir + 1; 1672 } else { 1673 odir = fdesc->fd_odir; 1674 olen = strlen(odir) + 1; 1675 } 1676 1677 if ((ndir = (char *)malloc(olen)) == 0) { 1678 remove_so(lml, nlmp); 1679 return (0); 1680 } 1681 (void) strncpy(ndir, odir, olen); 1682 ndir[--olen] = '\0'; 1683 1684 ORIGNAME(nlmp) = ndir; 1685 DIRSZ(nlmp) = olen; 1686 } 1687 1688 /* 1689 * Identify this as a new object. 1690 */ 1691 FLAGS(nlmp) |= FLG_RT_NEWLOAD; 1692 1693 return (nlmp); 1694 } 1695 1696 /* 1697 * This function loads the named file and returns a pointer to its link map. 1698 * It is assumed that the caller has already checked that the file is not 1699 * already loaded before calling this function (refer is_so_loaded()). 1700 * Find and open the file, map it into memory, add it to the end of the list 1701 * of link maps and return a pointer to the new link map. Return 0 on error. 1702 */ 1703 static Rt_map * 1704 load_so(Lm_list *lml, Aliste lmco, const char *oname, Rt_map *clmp, 1705 uint_t flags, Fdesc *nfdp, Rej_desc *rej) 1706 { 1707 char *name; 1708 uint_t slash = 0; 1709 size_t olen; 1710 Fdesc fdesc = { 0 }; 1711 Pnode *dir; 1712 1713 /* 1714 * If the file is the run time linker then it's already loaded. 1715 */ 1716 if (interp && (strcmp(oname, NAME(lml_rtld.lm_head)) == 0)) 1717 return (lml_rtld.lm_head); 1718 1719 /* 1720 * If this isn't a hardware capabilites pathname, which is already a 1721 * full, duplicated pathname, determine whether the pathname contains 1722 * a slash, and if not determine the input filename (for max path 1723 * length verification). 1724 */ 1725 if ((flags & FLG_RT_HWCAP) == 0) { 1726 const char *str; 1727 1728 for (str = oname; *str; str++) { 1729 if (*str == '/') { 1730 slash++; 1731 break; 1732 } 1733 } 1734 if (slash == 0) 1735 olen = (str - oname) + 1; 1736 } 1737 1738 /* 1739 * If we are passed a 'null' link-map this means that this is the first 1740 * object to be loaded on this link-map list. In that case we set the 1741 * link-map to ld.so.1's link-map. 1742 * 1743 * This link-map is referenced to determine what lookup rules to use 1744 * when searching for files. By using ld.so.1's we are defaulting to 1745 * ELF look-up rules. 1746 * 1747 * Note: This case happens when loading the first object onto 1748 * the plt_tracing link-map. 1749 */ 1750 if (clmp == 0) 1751 clmp = lml_rtld.lm_head; 1752 1753 /* 1754 * If this path resulted from a $HWCAP specification, then the best 1755 * hardware capability object has already been establish, and is 1756 * available in the calling file descriptor. Perform some minor book- 1757 * keeping so that we can fall through into common code. 1758 */ 1759 if (flags & FLG_RT_HWCAP) { 1760 /* 1761 * If this object is already loaded, we're done. 1762 */ 1763 if (nfdp->fd_lmp) 1764 return (nfdp->fd_lmp); 1765 1766 /* 1767 * Obtain the avl index for this object. 1768 */ 1769 (void) fpavl_loaded(lml, nfdp->fd_nname, &(nfdp->fd_avlwhere)); 1770 1771 /* 1772 * If the name and resolved pathname differ, duplicate the path 1773 * name once more to provide for genric cleanup by the caller. 1774 */ 1775 if (nfdp->fd_pname && (nfdp->fd_nname != nfdp->fd_pname)) { 1776 char *pname; 1777 1778 if ((pname = strdup(nfdp->fd_pname)) == NULL) 1779 return (0); 1780 nfdp->fd_pname = pname; 1781 } 1782 } else if (slash) { 1783 Rej_desc _rej = { 0 }; 1784 1785 *nfdp = fdesc; 1786 nfdp->fd_flags = FLG_FD_SLASH; 1787 1788 if (find_path(lml, oname, clmp, flags, nfdp, &_rej) == 0) { 1789 rejection_inherit(rej, &_rej); 1790 return (0); 1791 } 1792 1793 /* 1794 * If this object is already loaded, we're done. 1795 */ 1796 if (nfdp->fd_lmp) 1797 return (nfdp->fd_lmp); 1798 1799 } else { 1800 /* 1801 * No '/' - for each directory on list, make a pathname using 1802 * that directory and filename and try to open that file. 1803 */ 1804 Pnode *dirlist = (Pnode *)0; 1805 Word strhash = 0; 1806 #if !defined(ISSOLOAD_BASENAME_DISABLED) 1807 Rt_map *nlmp; 1808 #endif 1809 DBG_CALL(Dbg_libs_find(lml, oname)); 1810 1811 #if !defined(ISSOLOAD_BASENAME_DISABLED) 1812 if ((nlmp = is_so_loaded(lml, oname))) 1813 return (nlmp); 1814 #endif 1815 /* 1816 * Make sure we clear the file descriptor new name in case the 1817 * following directory search doesn't provide any directories 1818 * (odd, but this can be forced with a -znodefaultlib test). 1819 */ 1820 *nfdp = fdesc; 1821 for (dir = get_next_dir(&dirlist, clmp, flags); dir; 1822 dir = get_next_dir(&dirlist, clmp, flags)) { 1823 Rej_desc _rej = { 0 }; 1824 1825 *nfdp = fdesc; 1826 1827 /* 1828 * Try and locate this file. Make sure to clean up 1829 * any rejection information should the file have 1830 * been found, but not appropriate. 1831 */ 1832 if (find_file(lml, oname, clmp, flags, nfdp, &_rej, 1833 dir, &strhash, olen) == 0) { 1834 rejection_inherit(rej, &_rej); 1835 continue; 1836 } 1837 1838 /* 1839 * If this object is already loaded, we're done. 1840 */ 1841 if (nfdp->fd_lmp) 1842 return (nfdp->fd_lmp); 1843 1844 nfdp->fd_odir = dir->p_name; 1845 break; 1846 } 1847 1848 /* 1849 * If the file couldn't be loaded, do another comparison of 1850 * loaded files using just the basename. This catches folks 1851 * who may have loaded multiple full pathname files (possibly 1852 * from setxid applications) to satisfy dependency relationships 1853 * (i.e., a file might have a dependency on foo.so.1 which has 1854 * already been opened using its full pathname). 1855 */ 1856 if (nfdp->fd_nname == NULL) 1857 return (is_so_loaded(lml, oname)); 1858 } 1859 1860 /* 1861 * Duplicate the file name so that NAME() is available in core files. 1862 * Note, that hardware capability names are already duplicated, but 1863 * they get duplicated once more to insure consistent cleanup in the 1864 * event of an error condition. 1865 */ 1866 if ((name = strdup(nfdp->fd_nname)) == NULL) 1867 return (0); 1868 1869 if (nfdp->fd_nname == nfdp->fd_pname) 1870 nfdp->fd_nname = nfdp->fd_pname = name; 1871 else 1872 nfdp->fd_nname = name; 1873 1874 /* 1875 * Finish mapping the file and return the link-map descriptor. Note, 1876 * if this request originated from a HWCAP request, re-establish the 1877 * fdesc information. For single paged objects, such as filters, the 1878 * original mapping may have been sufficient to capture the file, thus 1879 * this mapping needs to be reset to insure it doesn't mistakenly get 1880 * unmapped as part of HWCAP cleanup. 1881 */ 1882 return (load_file(lml, lmco, nfdp)); 1883 } 1884 1885 /* 1886 * Trace an attempt to load an object. 1887 */ 1888 int 1889 load_trace(Lm_list *lml, const char **oname, Rt_map *clmp) 1890 { 1891 const char *name = *oname; 1892 1893 /* 1894 * First generate any ldd(1) diagnostics. 1895 */ 1896 if ((lml->lm_flags & (LML_FLG_TRC_VERBOSE | LML_FLG_TRC_SEARCH)) && 1897 ((FLAGS1(clmp) & FL1_RT_LDDSTUB) == 0)) 1898 (void) printf(MSG_INTL(MSG_LDD_FIL_FIND), name, NAME(clmp)); 1899 1900 /* 1901 * If we're being audited tell the audit library of the file we're 1902 * about to go search for. 1903 */ 1904 if (((lml->lm_tflags | FLAGS1(clmp)) & LML_TFLG_AUD_ACTIVITY) && 1905 (lml == LIST(clmp))) 1906 audit_activity(clmp, LA_ACT_ADD); 1907 1908 if ((lml->lm_tflags | FLAGS1(clmp)) & LML_TFLG_AUD_OBJSEARCH) { 1909 char *aname = audit_objsearch(clmp, name, LA_SER_ORIG); 1910 1911 /* 1912 * The auditor can indicate that this object should be ignored. 1913 */ 1914 if (aname == NULL) { 1915 DBG_CALL(Dbg_audit_terminate(lml, name)); 1916 return (0); 1917 } 1918 1919 /* 1920 * Protect ourselves from auditor mischief, by duplicating any 1921 * alternative name. The original name has been allocated from 1922 * expand(), so free this allocation before using the audit 1923 * alternative. 1924 */ 1925 if (name != aname) { 1926 if ((aname = strdup(aname)) == NULL) { 1927 eprintf(lml, ERR_FATAL, 1928 MSG_INTL(MSG_GEN_AUDITERM), name); 1929 return (0); 1930 } 1931 free((void *)*oname); 1932 *oname = aname; 1933 } 1934 } 1935 return (1); 1936 } 1937 1938 /* 1939 * Having loaded an object and created a link-map to describe it, finish 1940 * processing this stage, including verifying any versioning requirements, 1941 * updating the objects mode, creating a handle if necessary, and adding this 1942 * object to existing handles if required. 1943 */ 1944 static int 1945 load_finish(Lm_list *lml, const char *name, Rt_map *clmp, int nmode, 1946 uint_t flags, Grp_hdl **hdl, Rt_map *nlmp) 1947 { 1948 Aliste off; 1949 Grp_hdl *ghp, **ghpp; 1950 int promote; 1951 1952 /* 1953 * If this dependency is associated with a required version insure that 1954 * the version is present in the loaded file. 1955 */ 1956 if (((rtld_flags & RT_FL_NOVERSION) == 0) && 1957 (FCT(clmp) == &elf_fct) && VERNEED(clmp) && 1958 (LM_VERIFY_VERS(clmp)(name, clmp, nlmp) == 0)) 1959 return (0); 1960 1961 /* 1962 * If this object has indicated that it should be isolated as a group 1963 * (DT_FLAGS_1 contains DF_1_GROUP - object was built with -B group), 1964 * or if the callers direct bindings indicate it should be isolated as 1965 * a group (DYNINFO flags contains FLG_DI_GROUP - dependency followed 1966 * -zgroupperm), establish the appropriate mode. 1967 * 1968 * The intent of an object defining itself as a group is to isolate the 1969 * relocation of the group within its own members, however, unless 1970 * opened through dlopen(), in which case we assume dlsym() will be used 1971 * to located symbols in the new object, we still need to associate it 1972 * with the caller for it to be bound with. This is equivalent to a 1973 * dlopen(RTLD_GROUP) and dlsym() using the returned handle. 1974 */ 1975 if ((FLAGS(nlmp) | flags) & FLG_RT_SETGROUP) { 1976 nmode &= ~RTLD_WORLD; 1977 nmode |= RTLD_GROUP; 1978 1979 /* 1980 * If the object wasn't explicitly dlopen()'ed associate it with 1981 * the parent. 1982 */ 1983 if ((flags & FLG_RT_HANDLE) == 0) 1984 nmode |= RTLD_PARENT; 1985 } 1986 1987 /* 1988 * Establish new mode and flags. 1989 * 1990 * For patch backward compatibility, the following use of update_mode() 1991 * is disabled. 1992 */ 1993 #ifdef SIEBEL_DISABLE 1994 if (rtld_flags & RT_FL_DISFIX_1) 1995 promote = MODE(nlmp) |= 1996 (nmode & ~(RTLD_PARENT | RTLD_NOLOAD | RTLD_FIRST)); 1997 else 1998 #endif 1999 promote = update_mode(nlmp, MODE(nlmp), nmode); 2000 2001 FLAGS(nlmp) |= flags; 2002 2003 /* 2004 * If this is a global object, ensure the associated link-map list can 2005 * be rescanned for global, lazy dependencies. 2006 */ 2007 if (MODE(nlmp) & RTLD_GLOBAL) 2008 LIST(nlmp)->lm_flags &= ~LML_FLG_NOPENDGLBLAZY; 2009 2010 /* 2011 * If we've been asked to establish a handle create one for this object. 2012 * Or, if this object has already been analyzed, but this reference 2013 * requires that the mode of the object be promoted, also create a 2014 * handle to propagate the new modes to all this objects dependencies. 2015 */ 2016 if (((FLAGS(nlmp) | flags) & FLG_RT_HANDLE) || (promote && 2017 (FLAGS(nlmp) & FLG_RT_ANALYZED))) { 2018 uint_t oflags, hflags = 0; 2019 2020 if (nmode & RTLD_PARENT) 2021 hflags |= GPH_PARENT; 2022 if (nmode & RTLD_FIRST) 2023 hflags |= GPH_FIRST; 2024 2025 /* 2026 * Now that a handle is being created, remove this state from 2027 * the object so that it doesn't mistakenly get inherited by 2028 * a dependency. 2029 */ 2030 oflags = FLAGS(nlmp); 2031 FLAGS(nlmp) &= ~FLG_RT_HANDLE; 2032 2033 if ((ghp = hdl_create(lml, nlmp, clmp, hflags)) == 0) 2034 return (0); 2035 2036 /* 2037 * Add any dependencies that are already loaded, to the handle. 2038 */ 2039 if (hdl_initialize(ghp, nlmp, nmode, promote) == 0) 2040 return (0); 2041 2042 if (hdl) 2043 *hdl = ghp; 2044 2045 /* 2046 * If we were asked to create a handle, we're done. Otherwise, 2047 * remove the handle. The handle was only used to establish this 2048 * objects dependencies and promote any modes, so we don't want 2049 * this handle preventing the objects deletion. Fall through to 2050 * carry out any group processing. 2051 */ 2052 if ((oflags | flags) & FLG_RT_HANDLE) 2053 return (1); 2054 2055 free_hdl(ghp); 2056 } 2057 2058 /* 2059 * If the caller isn't part of a group we're done. 2060 */ 2061 if (GROUPS(clmp) == 0) 2062 return (1); 2063 2064 /* 2065 * Determine if our caller is already associated with a handle, if so 2066 * we need to add this object to any handles that already exist. 2067 * Traverse the list of groups our caller is a member of and add this 2068 * new link-map to those groups. 2069 */ 2070 DBG_CALL(Dbg_file_hdl_title(DBG_DEP_ADD)); 2071 for (ALIST_TRAVERSE(GROUPS(clmp), off, ghpp)) { 2072 Aliste off1; 2073 Grp_desc *gdp; 2074 int exist; 2075 Rt_map **lmpp; 2076 Alist *lmalp = 0; 2077 2078 ghp = *ghpp; 2079 2080 /* 2081 * If the caller doesn't indicate that its dependencies should 2082 * be added to a handle, ignore it. This case identifies a 2083 * parent of a dlopen(RTLD_PARENT) request. 2084 */ 2085 for (ALIST_TRAVERSE(ghp->gh_depends, off1, gdp)) { 2086 if (gdp->gd_depend == clmp) 2087 break; 2088 } 2089 if ((gdp->gd_flags & GPD_ADDEPS) == 0) 2090 continue; 2091 2092 if ((exist = hdl_add(ghp, nlmp, 2093 (GPD_DLSYM | GPD_RELOC | GPD_ADDEPS))) == 0) 2094 return (0); 2095 2096 /* 2097 * If this member already exists then its dependencies will 2098 * have already been processed. 2099 */ 2100 if (exist == ALE_EXISTS) 2101 continue; 2102 2103 /* 2104 * If the object we've added has just been opened, it will not 2105 * yet have been processed for its dependencies, these will be 2106 * added on later calls to load_one(). If it doesn't have any 2107 * dependencies we're also done. 2108 */ 2109 if (((FLAGS(nlmp) & FLG_RT_ANALYZED) == 0) || 2110 (DEPENDS(nlmp) == 0)) 2111 continue; 2112 2113 /* 2114 * Otherwise, this object exists and has dependencies, so add 2115 * all of its dependencies to the handle were operating on. 2116 */ 2117 if (alist_append(&lmalp, &nlmp, sizeof (Rt_map *), 2118 AL_CNT_DEPCLCT) == 0) 2119 return (0); 2120 2121 for (ALIST_TRAVERSE(lmalp, off1, lmpp)) { 2122 Rt_map * dlmp1 = *lmpp; 2123 Aliste off2; 2124 Bnd_desc ** bdpp; 2125 2126 /* 2127 * Add any dependencies of this dependency to the 2128 * dynamic dependency list so they can be further 2129 * processed. 2130 */ 2131 for (ALIST_TRAVERSE(DEPENDS(dlmp1), off2, bdpp)) { 2132 Bnd_desc * bdp = *bdpp; 2133 Rt_map * dlmp2 = bdp->b_depend; 2134 2135 if ((bdp->b_flags & BND_NEEDED) == 0) 2136 continue; 2137 2138 if (alist_test(&lmalp, dlmp2, sizeof (Rt_map *), 2139 AL_CNT_DEPCLCT) == 0) { 2140 free(lmalp); 2141 return (0); 2142 } 2143 } 2144 2145 if (nlmp == dlmp1) 2146 continue; 2147 2148 if ((exist = hdl_add(ghp, dlmp1, 2149 (GPD_DLSYM | GPD_RELOC | GPD_ADDEPS))) != 0) { 2150 if (exist == ALE_CREATE) { 2151 (void) update_mode(dlmp1, MODE(dlmp1), 2152 nmode); 2153 } 2154 continue; 2155 } 2156 free(lmalp); 2157 return (0); 2158 } 2159 free(lmalp); 2160 } 2161 return (1); 2162 } 2163 2164 /* 2165 * The central routine for loading shared objects. Insures ldd() diagnostics, 2166 * handles and any other related additions are all done in one place. 2167 */ 2168 static Rt_map * 2169 _load_path(Lm_list *lml, Aliste lmco, const char **oname, Rt_map *clmp, 2170 int nmode, uint_t flags, Grp_hdl ** hdl, Fdesc *nfdp, Rej_desc *rej) 2171 { 2172 Rt_map *nlmp; 2173 const char *name = *oname; 2174 2175 if ((nmode & RTLD_NOLOAD) == 0) { 2176 /* 2177 * If this isn't a noload request attempt to load the file. 2178 * Note, the name of the file may be changed by an auditor. 2179 */ 2180 if ((load_trace(lml, oname, clmp)) == 0) 2181 return (0); 2182 2183 name = *oname; 2184 2185 if ((nlmp = load_so(lml, lmco, name, clmp, flags, 2186 nfdp, rej)) == 0) 2187 return (0); 2188 2189 /* 2190 * If we've loaded a library which identifies itself as not 2191 * being dlopen()'able catch it here. Let non-dlopen()'able 2192 * objects through under RTLD_CONFGEN as they're only being 2193 * mapped to be dldump()'ed. 2194 */ 2195 if ((rtld_flags & RT_FL_APPLIC) && ((FLAGS(nlmp) & 2196 (FLG_RT_NOOPEN | FLG_RT_RELOCED)) == FLG_RT_NOOPEN) && 2197 ((nmode & RTLD_CONFGEN) == 0)) { 2198 Rej_desc _rej = { 0 }; 2199 2200 _rej.rej_name = name; 2201 _rej.rej_type = SGS_REJ_STR; 2202 _rej.rej_str = MSG_INTL(MSG_GEN_NOOPEN); 2203 DBG_CALL(Dbg_file_rejected(lml, &_rej)); 2204 rejection_inherit(rej, &_rej); 2205 remove_so(lml, nlmp); 2206 return (0); 2207 } 2208 } else { 2209 /* 2210 * If it's a NOLOAD request - check to see if the object 2211 * has already been loaded. 2212 */ 2213 /* LINTED */ 2214 if (nlmp = is_so_loaded(lml, name)) { 2215 if ((lml->lm_flags & LML_FLG_TRC_VERBOSE) && 2216 ((FLAGS1(clmp) & FL1_RT_LDDSTUB) == 0)) { 2217 (void) printf(MSG_INTL(MSG_LDD_FIL_FIND), name, 2218 NAME(clmp)); 2219 /* BEGIN CSTYLED */ 2220 if (*name == '/') 2221 (void) printf(MSG_ORIG(MSG_LDD_FIL_PATH), 2222 name, MSG_ORIG(MSG_STR_EMPTY), 2223 MSG_ORIG(MSG_STR_EMPTY)); 2224 else 2225 (void) printf(MSG_ORIG(MSG_LDD_FIL_EQUIV), 2226 name, NAME(nlmp), 2227 MSG_ORIG(MSG_STR_EMPTY), 2228 MSG_ORIG(MSG_STR_EMPTY)); 2229 /* END CSTYLED */ 2230 } 2231 } else { 2232 Rej_desc _rej = { 0 }; 2233 2234 _rej.rej_name = name; 2235 _rej.rej_type = SGS_REJ_STR; 2236 _rej.rej_str = strerror(ENOENT); 2237 DBG_CALL(Dbg_file_rejected(lml, &_rej)); 2238 rejection_inherit(rej, &_rej); 2239 return (0); 2240 } 2241 } 2242 2243 /* 2244 * Finish processing this loaded object. 2245 */ 2246 if (load_finish(lml, name, clmp, nmode, flags, hdl, nlmp) == 0) { 2247 FLAGS(nlmp) &= ~FLG_RT_NEWLOAD; 2248 2249 /* 2250 * If this object has already been analyzed, then it is in use, 2251 * so even though this operation has failed, it should not be 2252 * torn down. 2253 */ 2254 if ((FLAGS(nlmp) & FLG_RT_ANALYZED) == 0) 2255 remove_so(lml, nlmp); 2256 return (0); 2257 } 2258 2259 /* 2260 * If this object is new, and we're being audited, tell the audit 2261 * library of the file we've just opened. Note, if the new link-map 2262 * requires local auditing of its dependencies we also register its 2263 * opening. 2264 */ 2265 if (FLAGS(nlmp) & FLG_RT_NEWLOAD) { 2266 FLAGS(nlmp) &= ~FLG_RT_NEWLOAD; 2267 2268 if (((lml->lm_tflags | FLAGS1(clmp) | FLAGS1(nlmp)) & 2269 LML_TFLG_AUD_MASK) && (((lml->lm_flags | 2270 LIST(clmp)->lm_flags) & LML_FLG_NOAUDIT) == 0)) { 2271 if (audit_objopen(clmp, nlmp) == 0) { 2272 remove_so(lml, nlmp); 2273 return (0); 2274 } 2275 } 2276 } 2277 return (nlmp); 2278 } 2279 2280 Rt_map * 2281 load_path(Lm_list *lml, Aliste lmco, const char **name, Rt_map *clmp, 2282 int nmode, uint_t flags, Grp_hdl **hdl, Fdesc *cfdp, Rej_desc *rej) 2283 { 2284 Rt_map *lmp; 2285 Fdesc nfdp = { 0 }; 2286 2287 /* 2288 * If this path resulted from a $HWCAP specification, then the best 2289 * hardware capability object has already been establish, and is 2290 * available in the calling file descriptor. 2291 */ 2292 if (flags & FLG_RT_HWCAP) { 2293 if (cfdp->fd_lmp == 0) { 2294 /* 2295 * If this object hasn't yet been mapped, re-establish 2296 * the file descriptor structure to reflect this objects 2297 * original initial page mapping. Make sure any present 2298 * file descriptor mapping is removed before overwriting 2299 * the structure. 2300 */ 2301 #if defined(MAP_ALIGN) 2302 if (fmap->fm_maddr && 2303 ((fmap->fm_mflags & MAP_ALIGN) == 0)) 2304 #else 2305 if (fmap->fm_maddr) 2306 #endif 2307 (void) munmap(fmap->fm_maddr, fmap->fm_msize); 2308 } 2309 nfdp = *cfdp; 2310 *fmap = cfdp->fd_fmap; 2311 } 2312 2313 lmp = _load_path(lml, lmco, name, clmp, nmode, flags, hdl, &nfdp, rej); 2314 2315 /* 2316 * If this path originated from a $HWCAP specification, re-establish the 2317 * fdesc information. For single paged objects, such as filters, the 2318 * original mapping may have been sufficient to capture the file, thus 2319 * this mapping needs to be reset to insure it doesn't mistakenly get 2320 * unmapped as part of HWCAP cleanup. 2321 */ 2322 if (flags & FLG_RT_HWCAP) { 2323 cfdp->fd_fmap.fm_maddr = fmap->fm_maddr; 2324 cfdp->fd_fmap.fm_mflags = fmap->fm_mflags; 2325 cfdp->fd_fd = nfdp.fd_fd; 2326 } 2327 2328 return (lmp); 2329 } 2330 2331 /* 2332 * Load one object from a possible list of objects. Typically, for requests 2333 * such as NEEDED's, only one object is specified. However, this object could 2334 * be specified using $ISALIST or $HWCAP, in which case only the first object 2335 * that can be loaded is used (ie. the best). 2336 */ 2337 Rt_map * 2338 load_one(Lm_list *lml, Aliste lmco, Pnode *pnp, Rt_map *clmp, int mode, 2339 uint_t flags, Grp_hdl ** hdl) 2340 { 2341 Rej_desc rej = { 0 }; 2342 Pnode *tpnp; 2343 const char *name; 2344 2345 for (tpnp = pnp; tpnp && tpnp->p_name; tpnp = tpnp->p_next) { 2346 Rt_map *tlmp; 2347 2348 /* 2349 * A Hardware capabilities requirement can itself expand into 2350 * a number of candidates. 2351 */ 2352 if (tpnp->p_orig & PN_TKN_HWCAP) { 2353 if ((tlmp = load_hwcap(lml, lmco, tpnp->p_name, clmp, 2354 mode, (flags | FLG_RT_HWCAP), hdl, &rej)) != 0) { 2355 remove_rej(&rej); 2356 return (tlmp); 2357 } 2358 } else { 2359 if ((tlmp = load_path(lml, lmco, &tpnp->p_name, clmp, 2360 mode, flags, hdl, 0, &rej)) != 0) { 2361 remove_rej(&rej); 2362 return (tlmp); 2363 } 2364 } 2365 } 2366 2367 /* 2368 * If this pathname originated from an expanded token, use the original 2369 * for any diagnostic output. 2370 */ 2371 if ((name = pnp->p_oname) == 0) 2372 name = pnp->p_name; 2373 2374 file_notfound(lml, name, clmp, flags, &rej); 2375 remove_rej(&rej); 2376 return (0); 2377 } 2378 2379 /* 2380 * Determine whether a symbol is defined as an interposer. 2381 */ 2382 int 2383 is_sym_interposer(Rt_map *lmp, Sym *sym) 2384 { 2385 Syminfo *sip = SYMINFO(lmp); 2386 2387 if (sip) { 2388 ulong_t ndx; 2389 2390 ndx = (((ulong_t)sym - (ulong_t)SYMTAB(lmp)) / SYMENT(lmp)); 2391 /* LINTED */ 2392 sip = (Syminfo *)((char *)sip + (ndx * SYMINENT(lmp))); 2393 if (sip->si_flags & SYMINFO_FLG_INTERPOSE) 2394 return (1); 2395 } 2396 return (0); 2397 } 2398 2399 /* 2400 * While processing direct or group bindings, determine whether the object to 2401 * which we've bound can be interposed upon. In this context, copy relocations 2402 * are a form of interposition. 2403 */ 2404 static Sym * 2405 lookup_sym_interpose(Slookup *slp, Rt_map **dlmp, uint_t *binfo, Lm_list *lml, 2406 Sym *sym) 2407 { 2408 Rt_map *lmp; 2409 Slookup sl; 2410 2411 /* 2412 * If we've bound to a copy relocation definition then we need to assign 2413 * this binding to the original copy reference. Fabricate an inter- 2414 * position diagnostic, as this is a legitimate form of interposition. 2415 */ 2416 if (FLAGS1(*dlmp) & FL1_RT_COPYTOOK) { 2417 Rel_copy *rcp; 2418 Aliste off; 2419 2420 for (ALIST_TRAVERSE(COPY(*dlmp), off, rcp)) { 2421 if ((sym == rcp->r_dsym) || (sym->st_value && 2422 (sym->st_value == rcp->r_dsym->st_value))) { 2423 *dlmp = rcp->r_rlmp; 2424 *binfo |= 2425 (DBG_BINFO_INTERPOSE | DBG_BINFO_COPYREF); 2426 return (rcp->r_rsym); 2427 } 2428 } 2429 } 2430 2431 if ((lml->lm_flags & LML_FLG_INTRPOSE) == 0) 2432 return ((Sym *)0); 2433 2434 /* 2435 * Traverse the list of known interposers to determine whether any 2436 * offer the same symbol. Note, the head of the link-map could be 2437 * identified as an interposer. If it is, make sure we only look for 2438 * symbol definitions. Otherwise, skip the head of the link-map, so 2439 * that we don't bind to any .plt references, or copy-relocations 2440 * unintentionally. 2441 */ 2442 lmp = lml->lm_head; 2443 sl = *slp; 2444 if (((FLAGS(lmp) & MSK_RT_INTPOSE) == 0) || (sl.sl_flags & LKUP_COPY)) 2445 lmp = (Rt_map *)NEXT(lmp); 2446 else 2447 sl.sl_flags &= ~LKUP_SPEC; 2448 2449 for (; lmp; lmp = (Rt_map *)NEXT(lmp)) { 2450 if (FLAGS(lmp) & FLG_RT_DELETE) 2451 continue; 2452 if ((FLAGS(lmp) & MSK_RT_INTPOSE) == 0) 2453 break; 2454 2455 if (callable(lmp, *dlmp, 0)) { 2456 Rt_map *ilmp; 2457 2458 sl.sl_imap = lmp; 2459 if (sym = SYMINTP(lmp)(&sl, &ilmp, binfo)) { 2460 /* 2461 * If this object provides individual symbol 2462 * interposers, make sure that the symbol we 2463 * have found is tagged as an interposer. 2464 */ 2465 if ((FLAGS(ilmp) & FLG_RT_SYMINTPO) && 2466 (is_sym_interposer(ilmp, sym) == 0)) 2467 continue; 2468 2469 /* 2470 * Indicate this binding has occurred to an 2471 * interposer, and return the symbol. 2472 */ 2473 *binfo |= DBG_BINFO_INTERPOSE; 2474 *dlmp = ilmp; 2475 return (sym); 2476 } 2477 } 2478 } 2479 return ((Sym *)0); 2480 } 2481 2482 /* 2483 * If an object specifies direct bindings (it contains a syminfo structure 2484 * describing where each binding was established during link-editing, and the 2485 * object was built -Bdirect), then look for the symbol in the specific object. 2486 */ 2487 static Sym * 2488 lookup_sym_direct(Slookup *slp, Rt_map **dlmp, uint_t *binfo, Syminfo *sip, 2489 Rt_map *lmp) 2490 { 2491 Rt_map *clmp = slp->sl_cmap; 2492 Sym *sym; 2493 Slookup sl; 2494 2495 /* 2496 * If a direct binding resolves to the definition of a copy relocated 2497 * variable, it must be redirected to the copy (in the executable) that 2498 * will eventually be made. Typically, this redirection occurs in 2499 * lookup_sym_interpose(). But, there's an edge condition. If a 2500 * directly bound executable contains pic code, there may be a 2501 * reference to a definition that will eventually have a copy made. 2502 * However, this copy relocation may not yet have occurred, because 2503 * the relocation making this reference comes before the relocation 2504 * that will create the copy. 2505 * Under direct bindings, the syminfo indicates that a copy will be 2506 * taken (SYMINFO_FLG_COPY). This can only be set in an executable. 2507 * Thus, the caller must be the executable, so bind to the destination 2508 * of the copy within the executable. 2509 */ 2510 if (((slp->sl_flags & LKUP_COPY) == 0) && 2511 (sip->si_flags & SYMINFO_FLG_COPY)) { 2512 2513 slp->sl_imap = LIST(clmp)->lm_head; 2514 if (sym = SYMINTP(clmp)(slp, dlmp, binfo)) 2515 *binfo |= (DBG_BINFO_DIRECT | DBG_BINFO_COPYREF); 2516 return (sym); 2517 } 2518 2519 /* 2520 * If we need to directly bind to our parent, start looking in each 2521 * callers link map. 2522 */ 2523 sl = *slp; 2524 sl.sl_flags |= LKUP_DIRECT; 2525 sym = 0; 2526 2527 if (sip->si_boundto == SYMINFO_BT_PARENT) { 2528 Aliste off1; 2529 Bnd_desc **bdpp; 2530 Grp_hdl **ghpp; 2531 2532 /* 2533 * Determine the parent of this explicit dependency from its 2534 * CALLERS()'s list. 2535 */ 2536 for (ALIST_TRAVERSE(CALLERS(clmp), off1, bdpp)) { 2537 sl.sl_imap = lmp = (*bdpp)->b_caller; 2538 if ((sym = SYMINTP(lmp)(&sl, dlmp, binfo)) != 0) 2539 goto found; 2540 } 2541 2542 /* 2543 * A caller can also be defined as the parent of a dlopen() 2544 * call. Determine whether this object has any handles. The 2545 * dependencies maintained with the handle represent the 2546 * explicit dependencies of the dlopen()'ed object, and the 2547 * calling parent. 2548 */ 2549 for (ALIST_TRAVERSE(HANDLES(clmp), off1, ghpp)) { 2550 Grp_hdl *ghp = *ghpp; 2551 Grp_desc *gdp; 2552 Aliste off2; 2553 2554 for (ALIST_TRAVERSE(ghp->gh_depends, off2, gdp)) { 2555 if ((gdp->gd_flags & GPD_PARENT) == 0) 2556 continue; 2557 sl.sl_imap = lmp = gdp->gd_depend; 2558 if ((sym = SYMINTP(lmp)(&sl, dlmp, binfo)) != 0) 2559 goto found; 2560 } 2561 } 2562 } else { 2563 /* 2564 * If we need to direct bind to anything else look in the 2565 * link map associated with this symbol reference. 2566 */ 2567 if (sip->si_boundto == SYMINFO_BT_SELF) 2568 sl.sl_imap = lmp = clmp; 2569 else 2570 sl.sl_imap = lmp; 2571 2572 if (lmp) 2573 sym = SYMINTP(lmp)(&sl, dlmp, binfo); 2574 } 2575 found: 2576 if (sym) 2577 *binfo |= DBG_BINFO_DIRECT; 2578 2579 /* 2580 * If we've bound to an object, determine whether that object can be 2581 * interposed upon for this symbol. 2582 */ 2583 if (sym && (LIST(*dlmp)->lm_head != *dlmp) && 2584 (LIST(*dlmp) == LIST(clmp))) { 2585 Sym * isym; 2586 2587 if ((isym = lookup_sym_interpose(slp, dlmp, binfo, 2588 LIST(*dlmp), sym)) != 0) 2589 return (isym); 2590 } 2591 2592 return (sym); 2593 } 2594 2595 static Sym * 2596 _lookup_sym(Rt_map *ilmp, Slookup *slp, Rt_map **dlmp, uint_t *binfo, 2597 Aliste off) 2598 { 2599 Rt_map *lmp; 2600 2601 /* 2602 * Copy relocations should start their search after the head of the 2603 * main link-map control list. 2604 */ 2605 if ((off == ALO_DATA) && (slp->sl_flags & LKUP_COPY) && ilmp) 2606 lmp = (Rt_map *)NEXT(ilmp); 2607 else 2608 lmp = ilmp; 2609 2610 for (; lmp; lmp = (Rt_map *)NEXT(lmp)) { 2611 if (callable(slp->sl_cmap, lmp, 0)) { 2612 Sym *sym; 2613 2614 slp->sl_imap = lmp; 2615 if ((sym = SYMINTP(lmp)(slp, dlmp, binfo)) != 0) 2616 return (sym); 2617 } 2618 } 2619 return (0); 2620 } 2621 2622 static Sym * 2623 _lazy_find_sym(Rt_map *ilmp, Slookup *slp, Rt_map **dlmp, uint_t *binfo) 2624 { 2625 Rt_map *lmp; 2626 2627 for (lmp = ilmp; lmp; lmp = (Rt_map *)NEXT(lmp)) { 2628 if (LAZY(lmp) == 0) 2629 continue; 2630 if (callable(slp->sl_cmap, lmp, 0)) { 2631 Sym *sym; 2632 2633 slp->sl_imap = lmp; 2634 if ((sym = elf_lazy_find_sym(slp, dlmp, binfo)) != 0) 2635 return (sym); 2636 } 2637 } 2638 return (0); 2639 } 2640 2641 /* 2642 * Symbol lookup routine. Takes an ELF symbol name, and a list of link maps to 2643 * search (if the flag indicates LKUP_FIRST only the first link map of the list 2644 * is searched ie. we've been called from dlsym()). 2645 * If successful, return a pointer to the symbol table entry and a pointer to 2646 * the link map of the enclosing object. Else return a null pointer. 2647 * 2648 * To improve elf performance, we first compute the elf hash value and pass 2649 * it to each find_sym() routine. The elf function will use this value to 2650 * locate the symbol, the a.out function will simply ignore it. 2651 */ 2652 Sym * 2653 lookup_sym(Slookup *slp, Rt_map **dlmp, uint_t *binfo) 2654 { 2655 const char *name = slp->sl_name; 2656 Rt_map *clmp = slp->sl_cmap; 2657 Rt_map *ilmp = slp->sl_imap, *lmp; 2658 uint_t flags = slp->sl_flags; 2659 ulong_t rsymndx; 2660 Sym *sym = 0; 2661 Syminfo *sip; 2662 Slookup sl; 2663 2664 if (slp->sl_hash == 0) 2665 slp->sl_hash = elf_hash(name); 2666 *binfo = 0; 2667 2668 /* 2669 * Search the initial link map for the required symbol (this category is 2670 * selected by dlsym(), where individual link maps are searched for a 2671 * required symbol. Therefore, we know we have permission to look at 2672 * the link map). 2673 */ 2674 if (flags & LKUP_FIRST) 2675 return (SYMINTP(ilmp)(slp, dlmp, binfo)); 2676 2677 /* 2678 * Determine whether this lookup can be satisfied by an objects direct, 2679 * or lazy binding information. This is triggered by a relocation from 2680 * the object (hence rsymndx is set). 2681 */ 2682 if (((rsymndx = slp->sl_rsymndx) != 0) && 2683 ((sip = SYMINFO(clmp)) != 0)) { 2684 2685 /* 2686 * Find the corresponding Syminfo entry for the original 2687 * referencing symbol. 2688 */ 2689 /* LINTED */ 2690 sip = (Syminfo *)((char *)sip + (rsymndx * SYMINENT(clmp))); 2691 2692 /* 2693 * If the symbol information indicates a direct binding, 2694 * determine the link map that is required to satisfy the 2695 * binding. Note, if the dependency can not be found, but a 2696 * direct binding isn't required, we will still fall through 2697 * to perform any default symbol search. 2698 */ 2699 if (sip->si_flags & SYMINFO_FLG_DIRECT) { 2700 uint_t bound = sip->si_boundto; 2701 2702 lmp = 0; 2703 if (bound < SYMINFO_BT_LOWRESERVE) 2704 lmp = elf_lazy_load(clmp, bound, name); 2705 2706 /* 2707 * If direct bindings have been disabled, and this isn't 2708 * a translator, skip any direct binding now that we've 2709 * insured the resolving object has been loaded. 2710 * 2711 * If we need to direct bind to anything, we look in 2712 * ourselves, our parent, or in the link map we've just 2713 * loaded. Otherwise, even though we may have lazily 2714 * loaded an object we still continue to search for 2715 * symbols from the head of the link map list. 2716 */ 2717 if (((FLAGS(clmp) & FLG_RT_TRANS) || 2718 (!(LIST(clmp)->lm_tflags & LML_TFLG_NODIRECT))) && 2719 ((FLAGS1(clmp) & FL1_RT_DIRECT) || 2720 (sip->si_flags & SYMINFO_FLG_DIRECTBIND))) { 2721 sym = lookup_sym_direct(slp, dlmp, binfo, 2722 sip, lmp); 2723 2724 /* 2725 * If this direct binding has been disabled 2726 * (presumably because the symbol definition has 2727 * been changed since the referring object was 2728 * built), fall back to a standard symbol 2729 * search. 2730 */ 2731 if ((*binfo & BINFO_DIRECTDIS) == 0) 2732 return (sym); 2733 } 2734 } 2735 } 2736 2737 sl = *slp; 2738 2739 /* 2740 * If the referencing object has the DF_SYMBOLIC flag set, look in the 2741 * referencing object for the symbol first. Failing that, fall back to 2742 * our generic search. 2743 */ 2744 if (FLAGS1(clmp) & FL1_RT_SYMBOLIC) { 2745 sl.sl_imap = clmp; 2746 if (sym = SYMINTP(clmp)(&sl, dlmp, binfo)) { 2747 ulong_t dsymndx = (((ulong_t)sym - 2748 (ulong_t)SYMTAB(*dlmp)) / SYMENT(*dlmp)); 2749 2750 /* 2751 * Make sure this symbol hasn't explicitly been defined 2752 * as nodirect. 2753 */ 2754 if (((sip = SYMINFO(*dlmp)) == 0) || 2755 /* LINTED */ 2756 ((sip = (Syminfo *)((char *)sip + 2757 (dsymndx * SYMINENT(*dlmp)))) == 0) || 2758 ((sip->si_flags & SYMINFO_FLG_NOEXTDIRECT) == 0)) 2759 return (sym); 2760 } 2761 } 2762 2763 /* 2764 * If this lookup originates from a standard relocation, then traverse 2765 * all link-map lists inspecting any object that is available to this 2766 * caller. Otherwise, traverse the link-map list associate with the 2767 * caller. 2768 */ 2769 if (flags & LKUP_ALLCNTLIST) { 2770 Aliste off; 2771 Lm_cntl *lmc; 2772 2773 sym = 0; 2774 2775 for (ALIST_TRAVERSE(LIST(clmp)->lm_lists, off, lmc)) { 2776 if ((sym = _lookup_sym(lmc->lc_head, &sl, dlmp, 2777 binfo, off)) != 0) 2778 break; 2779 } 2780 } else 2781 sym = _lookup_sym(ilmp, &sl, dlmp, binfo, ALO_DATA); 2782 2783 /* 2784 * To allow transitioning into a world of lazy loading dependencies see 2785 * if this link map contains objects that have lazy dependencies still 2786 * outstanding. If so, and we haven't been able to locate a non-weak 2787 * symbol reference, start bringing in any lazy dependencies to see if 2788 * the reference can be satisfied. Use of dlsym(RTLD_PROBE) sets the 2789 * LKUP_NOFALBACK flag, and this flag disables this fall back. 2790 */ 2791 if ((sym == 0) && ((sl.sl_flags & LKUP_NOFALBACK) == 0)) { 2792 if ((lmp = ilmp) == 0) 2793 lmp = LIST(clmp)->lm_head; 2794 if ((flags & LKUP_WEAK) || (LIST(lmp)->lm_lazy == 0)) 2795 return ((Sym *)0); 2796 2797 DBG_CALL(Dbg_syms_lazy_rescan(LIST(clmp), name)); 2798 2799 /* 2800 * If this request originated from a dlsym(RTLD_NEXT) then start 2801 * looking for dependencies from the caller, otherwise use the 2802 * initial link-map. 2803 */ 2804 if (flags & LKUP_NEXT) 2805 sym = _lazy_find_sym(clmp, &sl, dlmp, binfo); 2806 else { 2807 Aliste off; 2808 Lm_cntl *lmc; 2809 2810 for (ALIST_TRAVERSE(LIST(clmp)->lm_lists, off, lmc)) { 2811 sl.sl_flags |= LKUP_NOFALBACK; 2812 if ((sym = _lazy_find_sym(lmc->lc_head, &sl, 2813 dlmp, binfo)) != 0) 2814 break; 2815 } 2816 } 2817 } 2818 2819 /* 2820 * If the caller is restricted to a symbol search within its group, 2821 * determine if it is necessary to follow a binding from outside of 2822 * the group. 2823 */ 2824 if (sym && ((MODE(clmp) & (RTLD_GROUP | RTLD_WORLD)) == RTLD_GROUP)) { 2825 Sym * isym; 2826 2827 if ((isym = lookup_sym_interpose(slp, dlmp, binfo, LIST(*dlmp), 2828 sym)) != 0) 2829 return (isym); 2830 } 2831 return (sym); 2832 } 2833 2834 /* 2835 * Associate a binding descriptor with a caller and its dependency, or update 2836 * an existing descriptor. 2837 */ 2838 int 2839 bind_one(Rt_map *clmp, Rt_map *dlmp, uint_t flags) 2840 { 2841 Bnd_desc **bdpp, *bdp; 2842 Aliste off; 2843 int found = ALE_CREATE; 2844 2845 /* 2846 * Determine whether a binding descriptor already exists between the 2847 * two objects. 2848 */ 2849 for (ALIST_TRAVERSE(DEPENDS(clmp), off, bdpp)) { 2850 bdp = *bdpp; 2851 2852 if (bdp->b_depend == dlmp) { 2853 found = ALE_EXISTS; 2854 break; 2855 } 2856 } 2857 2858 if (found == ALE_CREATE) { 2859 /* 2860 * Create a new binding descriptor. 2861 */ 2862 if ((bdp = malloc(sizeof (Bnd_desc))) == 0) 2863 return (0); 2864 2865 bdp->b_caller = clmp; 2866 bdp->b_depend = dlmp; 2867 bdp->b_flags = 0; 2868 2869 /* 2870 * Append the binding descriptor to the caller and the 2871 * dependency. 2872 */ 2873 if (alist_append(&DEPENDS(clmp), &bdp, 2874 sizeof (Bnd_desc *), AL_CNT_DEPENDS) == 0) 2875 return (0); 2876 2877 if (alist_append(&CALLERS(dlmp), &bdp, 2878 sizeof (Bnd_desc *), AL_CNT_CALLERS) == 0) 2879 return (0); 2880 } 2881 2882 if ((found == ALE_CREATE) || ((bdp->b_flags & flags) != flags)) { 2883 bdp->b_flags |= flags; 2884 2885 if (flags & BND_REFER) 2886 FLAGS1(dlmp) |= FL1_RT_USED; 2887 2888 DBG_CALL(Dbg_file_bind_entry(LIST(clmp), bdp)); 2889 } 2890 return (found); 2891 } 2892 2893 /* 2894 * Cleanup after relocation processing. 2895 */ 2896 int 2897 relocate_finish(Rt_map *lmp, Alist *bound, int textrel, int ret) 2898 { 2899 DBG_CALL(Dbg_reloc_run(lmp, 0, ret, DBG_REL_FINISH)); 2900 2901 /* 2902 * Establish bindings to all objects that have been bound to. 2903 */ 2904 if (bound) { 2905 Aliste off; 2906 Rt_map **lmpp; 2907 2908 if (ret) { 2909 for (ALIST_TRAVERSE(bound, off, lmpp)) { 2910 if (bind_one(lmp, *lmpp, BND_REFER) == 0) { 2911 ret = 0; 2912 break; 2913 } 2914 } 2915 } 2916 free(bound); 2917 } 2918 2919 /* 2920 * If we write enabled the text segment to perform these relocations 2921 * re-protect by disabling writes. 2922 */ 2923 if (textrel) 2924 (void) LM_SET_PROT(lmp)(lmp, 0); 2925 2926 return (ret); 2927 } 2928