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 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 /* 32 * Processing of relocatable objects and shared objects. 33 */ 34 #include <stdio.h> 35 #include <string.h> 36 #include <fcntl.h> 37 #include <unistd.h> 38 #include <link.h> 39 #include <limits.h> 40 #include <sys/stat.h> 41 #include <sys/systeminfo.h> 42 #include <debug.h> 43 #include <msg.h> 44 #include <_libld.h> 45 46 /* 47 * Decide if we can link against this input file. 48 */ 49 static int 50 ifl_verify(Ehdr * ehdr, Ofl_desc * ofl, Rej_desc * rej) 51 { 52 /* 53 * Check the validity of the elf header information for compatibility 54 * with this machine and our own internal elf library. 55 */ 56 if ((ehdr->e_machine != M_MACH) && 57 ((ehdr->e_machine != M_MACHPLUS) && 58 ((ehdr->e_flags & M_FLAGSPLUS) == 0))) { 59 rej->rej_type = SGS_REJ_MACH; 60 rej->rej_info = (uint_t)ehdr->e_machine; 61 return (0); 62 } 63 if (ehdr->e_ident[EI_DATA] != M_DATA) { 64 rej->rej_type = SGS_REJ_DATA; 65 rej->rej_info = (uint_t)ehdr->e_ident[EI_DATA]; 66 return (0); 67 } 68 if (ehdr->e_version > ofl->ofl_dehdr->e_version) { 69 rej->rej_type = SGS_REJ_VERSION; 70 rej->rej_info = (uint_t)ehdr->e_version; 71 return (0); 72 } 73 return (1); 74 } 75 76 /* 77 * Check sanity of file header and allocate an infile descriptor 78 * for the file being processed. 79 */ 80 static Ifl_desc * 81 ifl_setup(const char *name, Ehdr *ehdr, Elf *elf, Half flags, Ofl_desc *ofl, 82 Rej_desc *rej) 83 { 84 Ifl_desc *ifl; 85 List *list; 86 Rej_desc _rej = { 0 }; 87 88 if (ifl_verify(ehdr, ofl, &_rej) == 0) { 89 _rej.rej_name = name; 90 DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); 91 if (rej->rej_type == 0) { 92 *rej = _rej; 93 rej->rej_name = strdup(_rej.rej_name); 94 } 95 return (0); 96 } 97 98 if ((ifl = libld_calloc(1, sizeof (Ifl_desc))) == 0) 99 return ((Ifl_desc *)S_ERROR); 100 ifl->ifl_name = name; 101 ifl->ifl_ehdr = ehdr; 102 ifl->ifl_elf = elf; 103 ifl->ifl_flags = flags; 104 105 /* 106 * Is this file using 'extended Section Indexes'. If so, use the 107 * e_shnum & e_shstrndx which can be found at: 108 * 109 * e_shnum == Shdr[0].sh_size 110 * e_shstrndx == Shdr[0].sh_link 111 */ 112 if ((ehdr->e_shnum == 0) && (ehdr->e_shoff != 0)) { 113 Elf_Scn *scn; 114 Shdr *shdr0; 115 116 if ((scn = elf_getscn(elf, 0)) == NULL) { 117 eprintf(ofl->ofl_lml, ERR_ELF, 118 MSG_INTL(MSG_ELF_GETSCN), name); 119 ofl->ofl_flags |= FLG_OF_FATAL; 120 return ((Ifl_desc *)S_ERROR); 121 } 122 if ((shdr0 = elf_getshdr(scn)) == NULL) { 123 eprintf(ofl->ofl_lml, ERR_ELF, 124 MSG_INTL(MSG_ELF_GETSHDR), name); 125 ofl->ofl_flags |= FLG_OF_FATAL; 126 return ((Ifl_desc *)S_ERROR); 127 } 128 ifl->ifl_shnum = (Word)shdr0->sh_size; 129 if (ehdr->e_shstrndx == SHN_XINDEX) 130 ifl->ifl_shstrndx = shdr0->sh_link; 131 else 132 ifl->ifl_shstrndx = ehdr->e_shstrndx; 133 } else { 134 ifl->ifl_shnum = ehdr->e_shnum; 135 ifl->ifl_shstrndx = ehdr->e_shstrndx; 136 } 137 138 if ((ifl->ifl_isdesc = libld_calloc(ifl->ifl_shnum, 139 sizeof (Is_desc *))) == 0) 140 return ((Ifl_desc *)S_ERROR); 141 142 /* 143 * Record this new input file on the shared object or relocatable 144 * object input file list. 145 */ 146 if (ifl->ifl_ehdr->e_type == ET_DYN) { 147 list = &ofl->ofl_sos; 148 } else { 149 list = &ofl->ofl_objs; 150 } 151 152 if (list_appendc(list, ifl) == 0) 153 return ((Ifl_desc *)S_ERROR); 154 return (ifl); 155 } 156 157 /* 158 * Process a generic section. The appropriate section information is added 159 * to the files input descriptor list. 160 */ 161 static uintptr_t 162 process_section(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 163 Word ndx, int ident, Ofl_desc *ofl) 164 { 165 Is_desc *isp; 166 167 /* 168 * Create a new input section descriptor. If this is a NOBITS 169 * section elf_getdata() will still create a data buffer (the buffer 170 * will be null and the size will reflect the actual memory size). 171 */ 172 if ((isp = libld_calloc(sizeof (Is_desc), 1)) == 0) 173 return (S_ERROR); 174 isp->is_shdr = shdr; 175 isp->is_file = ifl; 176 isp->is_name = name; 177 isp->is_scnndx = ndx; 178 isp->is_flags = FLG_IS_EXTERNAL; 179 /* LINTED */ 180 isp->is_key = (Half)ident; 181 if ((isp->is_indata = elf_getdata(scn, NULL)) == NULL) { 182 eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETDATA), 183 ifl->ifl_name); 184 ofl->ofl_flags |= FLG_OF_FATAL; 185 return (0); 186 } 187 188 if ((shdr->sh_flags & SHF_EXCLUDE) && 189 ((ofl->ofl_flags & FLG_OF_RELOBJ) == 0)) { 190 isp->is_flags |= FLG_IS_DISCARD; 191 } 192 193 /* 194 * Add the new input section to the files input section list and 195 * to the output section list (some sections like .strtab and 196 * .shstrtab are not added to the output section list). 197 * 198 * If the section has the SHF_ORDERED flag on, do the ld_place_section() 199 * after all input sections from this file are read in. 200 */ 201 ifl->ifl_isdesc[ndx] = isp; 202 if (ident && (shdr->sh_flags & ALL_SHF_ORDER) == 0) 203 return ((uintptr_t)ld_place_section(ofl, isp, ident, 0)); 204 205 if (ident && (shdr->sh_flags & ALL_SHF_ORDER)) { 206 isp->is_flags |= FLG_IS_ORDERED; 207 isp->is_ident = ident; 208 209 if ((ndx != 0) && (ndx == shdr->sh_link) && 210 (shdr->sh_flags & SHF_ORDERED)) { 211 return ((uintptr_t)ld_place_section(ofl, isp, 212 ident, 0)); 213 } 214 } 215 return (1); 216 } 217 218 /* 219 * Determine the software capabilities of the object being built from the 220 * capabilities of the input relocatable objects. One software capability 221 * is presently recognized, and represented with the following (sys/elf.h): 222 * 223 * SF1_SUNW_FPKNWN use/non-use of frame pointer is known, and 224 * SF1_SUNW_FPUSED the frame pointer is in use. 225 * 226 * The resolution of the present fame pointer state, and the capabilities 227 * provided by a new input relocatable object are: 228 * 229 * new input relocatable object 230 * 231 * present | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | <unknown> 232 * state | SF1_SUNW_FPUSED | | 233 * --------------------------------------------------------------------------- 234 * SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN 235 * SF1_SUNW_FPUSED | SF1_SUNW_FPUSED | | SF1_SUNW_FPUSED 236 * --------------------------------------------------------------------------- 237 * SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN 238 * | | | 239 * --------------------------------------------------------------------------- 240 * <unknown> | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | <unknown> 241 * | SF1_SUNW_FPUSED | | 242 */ 243 static void 244 sf1_cap(Ofl_desc *ofl, Xword val, Ifl_desc *ifl, const char *name) 245 { 246 Xword badval; 247 248 /* 249 * If a mapfile has established definitions to override any input 250 * capabilities, ignore any new input capabilities. 251 */ 252 if (ofl->ofl_flags1 & FLG_OF1_OVSFCAP) { 253 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_IGNORE, CA_SUNW_SF_1, 254 val, M_MACH); 255 return; 256 } 257 258 /* 259 * If this object doesn't specify any capabilities, ignore it, and 260 * leave the state as is. 261 */ 262 if (val == 0) 263 return; 264 265 /* 266 * Make sure we only accept known software capabilities. Note, that 267 * an F1_SUNW_FPUSED by itself is viewed as bad practice. 268 */ 269 if ((badval = (val & ~SF1_SUNW_MASK)) != 0) { 270 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_BADSF1), 271 ifl->ifl_name, name, EC_XWORD(badval)); 272 val &= SF1_SUNW_MASK; 273 } 274 if (val == SF1_SUNW_FPUSED) { 275 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_BADSF1), 276 ifl->ifl_name, name, EC_XWORD(val)); 277 return; 278 } 279 280 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_OLD, CA_SUNW_SF_1, 281 ofl->ofl_sfcap_1, M_MACH); 282 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_NEW, CA_SUNW_SF_1, 283 val, M_MACH); 284 285 /* 286 * Determine the resolution of the present frame pointer and the 287 * new input relocatable objects frame pointer. 288 */ 289 if ((ofl->ofl_sfcap_1 & (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) == 290 (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) { 291 /* 292 * If the new relocatable object isn't using a frame pointer, 293 * reduce the present state to unused. 294 */ 295 if ((val & (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) != 296 (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) 297 ofl->ofl_sfcap_1 &= ~SF1_SUNW_FPUSED; 298 299 } else if ((ofl->ofl_sfcap_1 & SF1_SUNW_FPKNWN) == 0) { 300 /* 301 * If the present state is unknown, take the new relocatable 302 * object frame pointer usage. 303 */ 304 ofl->ofl_sfcap_1 = val; 305 } 306 307 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_RESOLVED, CA_SUNW_SF_1, 308 ofl->ofl_sfcap_1, M_MACH); 309 } 310 311 /* 312 * Determine the hardware capabilities of the object being built from the 313 * capabilities of the input relocatable objects. There's really little to 314 * do here, other than to offer diagnostics, hardware capabilities are simply 315 * additive. 316 */ 317 static void 318 hw1_cap(Ofl_desc *ofl, Xword val) 319 { 320 /* 321 * If a mapfile has established definitions to override any input 322 * capabilities, ignore any new input capabilities. 323 */ 324 if (ofl->ofl_flags1 & FLG_OF1_OVHWCAP) { 325 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_IGNORE, CA_SUNW_HW_1, 326 val, M_MACH); 327 return; 328 } 329 330 /* 331 * If this object doesn't specify any capabilities, ignore it, and 332 * leave the state as is. 333 */ 334 if (val == 0) 335 return; 336 337 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_OLD, CA_SUNW_HW_1, 338 ofl->ofl_hwcap_1, M_MACH); 339 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_NEW, CA_SUNW_HW_1, val, M_MACH); 340 341 ofl->ofl_hwcap_1 |= val; 342 343 Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_RESOLVED, CA_SUNW_HW_1, 344 ofl->ofl_hwcap_1, M_MACH); 345 } 346 347 /* 348 * Process a hardware/software capabilities section. Traverse the section 349 * updating the global capabilities variables as necessary. 350 */ 351 static void 352 process_cap(const char *name, Ifl_desc *ifl, Is_desc *cisp, Ofl_desc *ofl) 353 { 354 Cap *cdata; 355 356 DBG_CALL(Dbg_cap_sec_title(ofl)); 357 358 for (cdata = (Cap *)cisp->is_indata->d_buf; 359 cdata->c_tag != CA_SUNW_NULL; cdata++) { 360 switch (cdata->c_tag) { 361 case CA_SUNW_HW_1: 362 hw1_cap(ofl, cdata->c_un.c_val); 363 break; 364 case CA_SUNW_SF_1: 365 sf1_cap(ofl, cdata->c_un.c_val, ifl, name); 366 break; 367 default: 368 eprintf(ofl->ofl_lml, ERR_WARNING, 369 MSG_INTL(MSG_FIL_UNKCAP), 370 ifl->ifl_name, name, cdata->c_tag); 371 } 372 } 373 } 374 375 /* 376 * Simply process the section so that we have pointers to the data for use 377 * in later routines, however don't add the section to the output section 378 * list as we will be creating our own replacement sections later (ie. 379 * symtab and relocation). 380 */ 381 static uintptr_t 382 /* ARGSUSED5 */ 383 process_input(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 384 Word ndx, int ident, Ofl_desc *ofl) 385 { 386 return (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl)); 387 } 388 389 /* 390 * Keep a running count of relocation entries from input relocatable objects for 391 * sizing relocation buckets later. If we're building an executable, save any 392 * relocations from shared objects to determine if any copy relocation symbol 393 * has a displacement relocation against it. 394 */ 395 static uintptr_t 396 /* ARGSUSED5 */ 397 process_reloc(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 398 Word ndx, int ident, Ofl_desc *ofl) 399 { 400 if (process_section(name, ifl, 401 shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) 402 return (S_ERROR); 403 404 if (ifl->ifl_ehdr->e_type == ET_REL) { 405 if (shdr->sh_entsize && (shdr->sh_entsize <= shdr->sh_size)) 406 /* LINTED */ 407 ofl->ofl_relocincnt += 408 (Word)(shdr->sh_size / shdr->sh_entsize); 409 } else if (ofl->ofl_flags & FLG_OF_EXEC) { 410 if (list_appendc(&ifl->ifl_relsect, ifl->ifl_isdesc[ndx]) == 0) 411 return (S_ERROR); 412 } 413 return (1); 414 } 415 416 417 /* 418 * Process a string table section. A valid section contains an initial and 419 * final null byte. 420 */ 421 static uintptr_t 422 process_strtab(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 423 Word ndx, int ident, Ofl_desc *ofl) 424 { 425 char *data; 426 size_t size; 427 Is_desc *isp; 428 uintptr_t error; 429 430 /* 431 * Never include .stab.excl sections in any output file. 432 * If the -s flag has been specified strip any .stab sections. 433 */ 434 if (((ofl->ofl_flags & FLG_OF_STRIP) && ident && 435 (strncmp(name, MSG_ORIG(MSG_SCN_STAB), MSG_SCN_STAB_SIZE) == 0)) || 436 (strcmp(name, MSG_ORIG(MSG_SCN_STABEXCL)) == 0) && ident) 437 return (1); 438 439 /* 440 * If we got here to process a .shstrtab or .dynstr table, `ident' will 441 * be null. Otherwise make sure we don't have a .strtab section as this 442 * should not be added to the output section list either. 443 */ 444 if ((ident != M_ID_NULL) && 445 (strcmp(name, MSG_ORIG(MSG_SCN_STRTAB)) == 0)) 446 ident = M_ID_NULL; 447 448 error = process_section(name, ifl, shdr, scn, ndx, ident, ofl); 449 if ((error == 0) || (error == S_ERROR)) 450 return (error); 451 452 /* 453 * String tables should start and end with a NULL byte. Note, it has 454 * been known for the assembler to create empty string tables, so check 455 * the size before attempting to verify the data itself. 456 */ 457 isp = ifl->ifl_isdesc[ndx]; 458 size = isp->is_indata->d_size; 459 if (size) { 460 data = isp->is_indata->d_buf; 461 if (data[0] != '\0' || data[size - 1] != '\0') 462 eprintf(ofl->ofl_lml, ERR_WARNING, 463 MSG_INTL(MSG_FIL_MALSTR), ifl->ifl_name, name); 464 } else 465 isp->is_indata->d_buf = (void *)MSG_ORIG(MSG_STR_EMPTY); 466 467 ifl->ifl_flags |= FLG_IF_HSTRTAB; 468 return (1); 469 } 470 471 /* 472 * Invalid sections produce a warning and are skipped. 473 */ 474 static uintptr_t 475 /* ARGSUSED3 */ 476 invalid_section(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 477 Word ndx, int ident, Ofl_desc *ofl) 478 { 479 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_INVALSEC), 480 ifl->ifl_name, name, conv_sec_type(ifl->ifl_ehdr->e_machine, 481 shdr->sh_type, 0)); 482 return (1); 483 } 484 485 /* 486 * Process a progbits section. 487 */ 488 static uintptr_t 489 process_progbits(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 490 Word ndx, int ident, Ofl_desc *ofl) 491 { 492 int stab_index = 0; 493 494 /* 495 * Never include .stab.excl sections in any output file. 496 * If the -s flag has been specified strip any .stab sections. 497 */ 498 if (ident && (strncmp(name, MSG_ORIG(MSG_SCN_STAB), 499 MSG_SCN_STAB_SIZE) == 0)) { 500 if ((ofl->ofl_flags & FLG_OF_STRIP) || 501 (strcmp((name + MSG_SCN_STAB_SIZE), 502 MSG_ORIG(MSG_SCN_EXCL)) == 0)) 503 return (1); 504 505 if (strcmp((name + MSG_SCN_STAB_SIZE), 506 MSG_ORIG(MSG_SCN_INDEX)) == 0) 507 stab_index = 1; 508 } 509 510 if ((ofl->ofl_flags & FLG_OF_STRIP) && ident) { 511 if ((strncmp(name, MSG_ORIG(MSG_SCN_DEBUG), 512 MSG_SCN_DEBUG_SIZE) == 0) || 513 (strcmp(name, MSG_ORIG(MSG_SCN_LINE)) == 0)) 514 return (1); 515 } 516 517 /* 518 * Update the ident to reflect the type of section we've got. 519 * 520 * If there is any .plt or .got section to generate we'll be creating 521 * our own version, so don't allow any input sections of these types to 522 * be added to the output section list (why a relocatable object would 523 * have a .plt or .got is a mystery, but stranger things have occurred). 524 */ 525 if (ident) { 526 if (shdr->sh_flags & SHF_TLS) 527 ident = M_ID_TLS; 528 else if ((shdr->sh_flags & ~ALL_SHF_IGNORE) == 529 (SHF_ALLOC | SHF_EXECINSTR)) 530 ident = M_ID_TEXT; 531 else if (shdr->sh_flags & SHF_ALLOC) { 532 if ((strcmp(name, MSG_ORIG(MSG_SCN_PLT)) == 0) || 533 (strcmp(name, MSG_ORIG(MSG_SCN_GOT)) == 0)) 534 ident = M_ID_NULL; 535 else if (stab_index) { 536 /* 537 * This is a work-around for x86 compilers that 538 * have set SHF_ALLOC for the .stab.index 539 * section. 540 * 541 * Because of this, make sure that the 542 * .stab.index does not end up as the last 543 * section in the text segment. Older linkers 544 * can produce segmentation violations when they 545 * strip (ld -s) against a shared object whose 546 * last section in the text segment is a .stab. 547 */ 548 ident = M_ID_INTERP; 549 } else 550 ident = M_ID_DATA; 551 } else 552 ident = M_ID_NOTE; 553 } 554 return (process_section(name, ifl, shdr, scn, ndx, ident, ofl)); 555 } 556 557 /* 558 * Handles the SHT_SUNW_{DEBUG,DEBUGSTR) sections. 559 */ 560 static uintptr_t 561 process_debug(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 562 Word ndx, int ident, Ofl_desc *ofl) 563 { 564 /* 565 * Debug information is discarded when the 'ld -s' flag is invoked. 566 */ 567 if (ofl->ofl_flags & FLG_OF_STRIP) { 568 return (1); 569 } 570 return (process_progbits(name, ifl, shdr, scn, ndx, ident, ofl)); 571 } 572 573 /* 574 * Process a nobits section. 575 */ 576 static uintptr_t 577 process_nobits(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 578 Word ndx, int ident, Ofl_desc *ofl) 579 { 580 if (ident) { 581 if (shdr->sh_flags & SHF_TLS) 582 ident = M_ID_TLSBSS; 583 #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) 584 else if (shdr->sh_flags & SHF_AMD64_LARGE) 585 ident = M_ID_LBSS; 586 #endif 587 else 588 ident = M_ID_BSS; 589 } 590 return (process_section(name, ifl, shdr, scn, ndx, ident, ofl)); 591 } 592 593 /* 594 * Process a SHT_*_ARRAY section. 595 */ 596 static uintptr_t 597 process_array(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 598 Word ndx, int ident, Ofl_desc *ofl) 599 { 600 Os_desc *osp; 601 Is_desc *isp; 602 603 if (ident) 604 ident = M_ID_ARRAY; 605 606 if (process_section(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) 607 return (S_ERROR); 608 609 if (((isp = ifl->ifl_isdesc[ndx]) == 0) || 610 ((osp = isp->is_osdesc) == 0)) 611 return (0); 612 613 if ((shdr->sh_type == SHT_FINI_ARRAY) && 614 (ofl->ofl_osfiniarray == 0)) 615 ofl->ofl_osfiniarray = osp; 616 else if ((shdr->sh_type == SHT_INIT_ARRAY) && 617 (ofl->ofl_osinitarray == 0)) 618 ofl->ofl_osinitarray = osp; 619 else if ((shdr->sh_type == SHT_PREINIT_ARRAY) && 620 (ofl->ofl_ospreinitarray == 0)) 621 ofl->ofl_ospreinitarray = osp; 622 623 return (1); 624 } 625 626 /* 627 * Process a SHT_SYMTAB_SHNDX section. 628 */ 629 static uintptr_t 630 process_sym_shndx(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 631 Word ndx, int ident, Ofl_desc *ofl) 632 { 633 if (process_input(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) 634 return (S_ERROR); 635 636 /* 637 * Have we already seen the related SYMTAB - if so verify it now. 638 */ 639 if (shdr->sh_link < ndx) { 640 Is_desc *isp = ifl->ifl_isdesc[shdr->sh_link]; 641 642 if ((isp == 0) || ((isp->is_shdr->sh_type != SHT_SYMTAB) && 643 (isp->is_shdr->sh_type != SHT_DYNSYM))) { 644 eprintf(ofl->ofl_lml, ERR_FATAL, 645 MSG_INTL(MSG_FIL_INVSHLINK), ifl->ifl_name, name, 646 EC_XWORD(shdr->sh_link)); 647 return (S_ERROR); 648 } 649 isp->is_symshndx = ifl->ifl_isdesc[ndx]; 650 } 651 return (1); 652 } 653 654 /* 655 * Final processing for SHT_SYMTAB_SHNDX section. 656 */ 657 static uintptr_t 658 /* ARGSUSED2 */ 659 sym_shndx_process(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl) 660 { 661 if (isc->is_shdr->sh_link > isc->is_scnndx) { 662 Is_desc *isp = ifl->ifl_isdesc[isc->is_shdr->sh_link]; 663 664 if ((isp == 0) || ((isp->is_shdr->sh_type != SHT_SYMTAB) && 665 (isp->is_shdr->sh_type != SHT_DYNSYM))) { 666 eprintf(ofl->ofl_lml, ERR_FATAL, 667 MSG_INTL(MSG_FIL_INVSHLINK), isc->is_file->ifl_name, 668 isc->is_name, EC_XWORD(isc->is_shdr->sh_link)); 669 return (S_ERROR); 670 } 671 isp->is_symshndx = isc; 672 } 673 return (1); 674 } 675 676 /* 677 * Process .dynamic section from a relocatable object. 678 * 679 * Note: That the .dynamic section is only considered interesting when 680 * dlopen()ing a relocatable object (thus FLG_OF1_RELDYN can only get 681 * set when libld is called from ld.so.1). 682 */ 683 /*ARGSUSED*/ 684 static uintptr_t 685 process_rel_dynamic(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 686 Word ndx, int ident, Ofl_desc *ofl) 687 { 688 Dyn *dyn; 689 Elf_Scn *strscn; 690 Elf_Data *dp; 691 char *str; 692 693 /* 694 * Process .dynamic sections from relocatable objects ? 695 */ 696 if ((ofl->ofl_flags1 & FLG_OF1_RELDYN) == 0) 697 return (1); 698 699 /* 700 * Find the string section associated with the .dynamic section. 701 */ 702 if ((strscn = elf_getscn(ifl->ifl_elf, shdr->sh_link)) == NULL) { 703 eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSCN), 704 ifl->ifl_name); 705 ofl->ofl_flags |= FLG_OF_FATAL; 706 return (0); 707 } 708 dp = elf_getdata(strscn, NULL); 709 str = (char *)dp->d_buf; 710 711 /* 712 * And get the .dynamic data 713 */ 714 dp = elf_getdata(scn, NULL); 715 716 for (dyn = (Dyn *)dp->d_buf; dyn->d_tag != DT_NULL; dyn++) { 717 Ifl_desc *difl; 718 719 switch (dyn->d_tag) { 720 case DT_NEEDED: 721 case DT_USED: 722 if (((difl = 723 libld_calloc(1, sizeof (Ifl_desc))) == 0) || 724 (list_appendc(&ofl->ofl_sos, difl) == 0)) 725 return (S_ERROR); 726 727 difl->ifl_name = MSG_ORIG(MSG_STR_DYNAMIC); 728 difl->ifl_soname = str + (size_t)dyn->d_un.d_val; 729 difl->ifl_flags = FLG_IF_NEEDSTR; 730 break; 731 case DT_RPATH: 732 case DT_RUNPATH: 733 if ((ofl->ofl_rpath = add_string(ofl->ofl_rpath, 734 (str + (size_t)dyn->d_un.d_val))) == 735 (const char *)S_ERROR) 736 return (S_ERROR); 737 break; 738 } 739 } 740 return (1); 741 } 742 743 /* 744 * Expand implicit references. Dependencies can be specified in terms of the 745 * $ORIGIN, $PLATFORM, $OSREL and $OSNAME tokens, either from their needed name, 746 * or via a runpath. In addition runpaths may also specify the $ISALIST token. 747 * 748 * Probably the most common reference to explicit dependencies (via -L) will be 749 * sufficient to find any associated implicit dependencies, but just in case we 750 * expand any occurrence of these known tokens here. 751 * 752 * Note, if any errors occur we simply return the original name. 753 * 754 * This code is remarkably similar to expand() in rtld/common/paths.c. 755 */ 756 static char *platform = 0; 757 static size_t platform_sz = 0; 758 static Isa_desc *isa = 0; 759 static Uts_desc *uts = 0; 760 761 static char * 762 expand(const char *parent, const char *name, char **next) 763 { 764 char _name[PATH_MAX], *nptr, *_next; 765 const char *optr; 766 size_t nrem = PATH_MAX - 1; 767 int expanded = 0, _expanded, isaflag = 0; 768 769 optr = name; 770 nptr = _name; 771 772 while (*optr) { 773 if (nrem == 0) 774 return ((char *)name); 775 776 if (*optr != '$') { 777 *nptr++ = *optr++, nrem--; 778 continue; 779 } 780 781 _expanded = 0; 782 783 if (strncmp(optr, MSG_ORIG(MSG_STR_ORIGIN), 784 MSG_STR_ORIGIN_SIZE) == 0) { 785 char *eptr; 786 787 /* 788 * For $ORIGIN, expansion is really just a concatenation 789 * of the parents directory name. For example, an 790 * explicit dependency foo/bar/lib1.so with a dependency 791 * on $ORIGIN/lib2.so would be expanded to 792 * foo/bar/lib2.so. 793 */ 794 if ((eptr = strrchr(parent, '/')) == 0) { 795 *nptr++ = '.'; 796 nrem--; 797 } else { 798 size_t len = eptr - parent; 799 800 if (len >= nrem) 801 return ((char *)name); 802 803 (void) strncpy(nptr, parent, len); 804 nptr = nptr + len; 805 nrem -= len; 806 } 807 optr += MSG_STR_ORIGIN_SIZE; 808 expanded = _expanded = 1; 809 810 } else if (strncmp(optr, MSG_ORIG(MSG_STR_PLATFORM), 811 MSG_STR_PLATFORM_SIZE) == 0) { 812 /* 813 * Establish the platform from sysconf - like uname -i. 814 */ 815 if ((platform == 0) && (platform_sz == 0)) { 816 char info[SYS_NMLN]; 817 long size; 818 819 size = sysinfo(SI_PLATFORM, info, SYS_NMLN); 820 if ((size != -1) && 821 (platform = libld_malloc((size_t)size))) { 822 (void) strcpy(platform, info); 823 platform_sz = (size_t)size - 1; 824 } else 825 platform_sz = 1; 826 } 827 if (platform != 0) { 828 if (platform_sz >= nrem) 829 return ((char *)name); 830 831 (void) strncpy(nptr, platform, platform_sz); 832 nptr = nptr + platform_sz; 833 nrem -= platform_sz; 834 835 optr += MSG_STR_PLATFORM_SIZE; 836 expanded = _expanded = 1; 837 } 838 839 } else if (strncmp(optr, MSG_ORIG(MSG_STR_OSNAME), 840 MSG_STR_OSNAME_SIZE) == 0) { 841 /* 842 * Establish the os name - like uname -s. 843 */ 844 if (uts == 0) 845 uts = conv_uts(); 846 847 if (uts && uts->uts_osnamesz) { 848 if (uts->uts_osnamesz >= nrem) 849 return ((char *)name); 850 851 (void) strncpy(nptr, uts->uts_osname, 852 uts->uts_osnamesz); 853 nptr = nptr + uts->uts_osnamesz; 854 nrem -= uts->uts_osnamesz; 855 856 optr += MSG_STR_OSNAME_SIZE; 857 expanded = _expanded = 1; 858 } 859 860 } else if (strncmp(optr, MSG_ORIG(MSG_STR_OSREL), 861 MSG_STR_OSREL_SIZE) == 0) { 862 /* 863 * Establish the os release - like uname -r. 864 */ 865 if (uts == 0) 866 uts = conv_uts(); 867 868 if (uts && uts->uts_osrelsz) { 869 if (uts->uts_osrelsz >= nrem) 870 return ((char *)name); 871 872 (void) strncpy(nptr, uts->uts_osrel, 873 uts->uts_osrelsz); 874 nptr = nptr + uts->uts_osrelsz; 875 nrem -= uts->uts_osrelsz; 876 877 optr += MSG_STR_OSREL_SIZE; 878 expanded = _expanded = 1; 879 } 880 881 } else if ((strncmp(optr, MSG_ORIG(MSG_STR_ISALIST), 882 MSG_STR_ISALIST_SIZE) == 0) && next && (isaflag++ == 0)) { 883 /* 884 * Establish instruction sets from sysconf. Note that 885 * this is only meaningful from runpaths. 886 */ 887 if (isa == 0) 888 isa = conv_isalist(); 889 890 if (isa && isa->isa_listsz && 891 (nrem > isa->isa_opt->isa_namesz)) { 892 size_t mlen, tlen, hlen = optr - name; 893 size_t no; 894 char *lptr; 895 Isa_opt *opt = isa->isa_opt; 896 897 (void) strncpy(nptr, opt->isa_name, 898 opt->isa_namesz); 899 nptr = nptr + opt->isa_namesz; 900 nrem -= opt->isa_namesz; 901 902 optr += MSG_STR_ISALIST_SIZE; 903 expanded = _expanded = 1; 904 905 tlen = strlen(optr); 906 907 /* 908 * As ISALIST expands to a number of elements, 909 * establish a new list to return to the caller. 910 * This will contain the present path being 911 * processed redefined for each isalist option, 912 * plus the original remaining list entries. 913 */ 914 mlen = ((hlen + tlen) * (isa->isa_optno - 1)) + 915 isa->isa_listsz - opt->isa_namesz; 916 if (*next) 917 mlen += strlen(*next); 918 if ((_next = lptr = libld_malloc(mlen)) == 0) 919 return (0); 920 921 for (no = 1, opt++; no < isa->isa_optno; 922 no++, opt++) { 923 (void) strncpy(lptr, name, hlen); 924 lptr = lptr + hlen; 925 (void) strncpy(lptr, opt->isa_name, 926 opt->isa_namesz); 927 lptr = lptr + opt->isa_namesz; 928 (void) strncpy(lptr, optr, tlen); 929 lptr = lptr + tlen; 930 *lptr++ = ':'; 931 } 932 if (*next) 933 (void) strcpy(lptr, *next); 934 else 935 *--lptr = '\0'; 936 } 937 } 938 939 /* 940 * If no expansion occurred skip the $ and continue. 941 */ 942 if (_expanded == 0) 943 *nptr++ = *optr++, nrem--; 944 } 945 946 /* 947 * If any ISALIST processing has occurred not only do we return the 948 * expanded node we're presently working on, but we must also update the 949 * remaining list so that it is effectively prepended with this node 950 * expanded to all remaining isalist options. Note that we can only 951 * handle one ISALIST per node. For more than one ISALIST to be 952 * processed we'd need a better algorithm than above to replace the 953 * newly generated list. Whether we want to encourage the number of 954 * pathname permutations this would provide is another question. So, for 955 * now if more than one ISALIST is encountered we return the original 956 * node untouched. 957 */ 958 if (isaflag) { 959 if (isaflag == 1) 960 *next = _next; 961 else 962 return ((char *)name); 963 } 964 965 *nptr = '\0'; 966 967 if (expanded) { 968 if ((nptr = libld_malloc(strlen(_name) + 1)) == 0) 969 return ((char *)name); 970 (void) strcpy(nptr, _name); 971 return (nptr); 972 } 973 return ((char *)name); 974 } 975 976 /* 977 * Process a dynamic section. If we are processing an explicit shared object 978 * then we need to determine if it has a recorded SONAME, if so, this name will 979 * be recorded in the output file being generated as the NEEDED entry rather 980 * than the shared objects filename itself. 981 * If the mode of the link-edit indicates that no undefined symbols should 982 * remain, then we also need to build up a list of any additional shared object 983 * dependencies this object may have. In this case save any NEEDED entries 984 * together with any associated run-path specifications. This information is 985 * recorded on the `ofl_soneed' list and will be analyzed after all explicit 986 * file processing has been completed (refer finish_libs()). 987 */ 988 static uintptr_t 989 process_dynamic(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl) 990 { 991 Dyn *data, *dyn; 992 char *str, *rpath = NULL; 993 const char *soname, *needed; 994 Sdf_desc *sdf; 995 Listnode *lnp; 996 997 data = (Dyn *)isc->is_indata->d_buf; 998 str = (char *)ifl->ifl_isdesc[isc->is_shdr->sh_link]->is_indata->d_buf; 999 1000 /* 1001 * First loop through the dynamic section looking for a run path. 1002 */ 1003 if (ofl->ofl_flags & (FLG_OF_NOUNDEF | FLG_OF_SYMBOLIC)) { 1004 for (dyn = data; dyn->d_tag != DT_NULL; dyn++) { 1005 if ((dyn->d_tag != DT_RPATH) && 1006 (dyn->d_tag != DT_RUNPATH)) 1007 continue; 1008 if ((rpath = str + (size_t)dyn->d_un.d_val) == NULL) 1009 continue; 1010 break; 1011 } 1012 } 1013 1014 /* 1015 * Now look for any needed dependencies (which may use the rpath) 1016 * or a new SONAME. 1017 */ 1018 for (dyn = data; dyn->d_tag != DT_NULL; dyn++) { 1019 if (dyn->d_tag == DT_SONAME) { 1020 if ((soname = str + (size_t)dyn->d_un.d_val) == NULL) 1021 continue; 1022 1023 /* 1024 * Update the input file structure with this new name. 1025 */ 1026 ifl->ifl_soname = soname; 1027 1028 } else if ((dyn->d_tag == DT_NEEDED) || 1029 (dyn->d_tag == DT_USED)) { 1030 if (!(ofl->ofl_flags & 1031 (FLG_OF_NOUNDEF | FLG_OF_SYMBOLIC))) 1032 continue; 1033 if ((needed = str + (size_t)dyn->d_un.d_val) == NULL) 1034 continue; 1035 1036 /* 1037 * Determine if this needed entry is already recorded on 1038 * the shared object needed list, if not create a new 1039 * definition for later processing (see finish_libs()). 1040 */ 1041 needed = expand(ifl->ifl_name, needed, (char **)0); 1042 1043 if ((sdf = sdf_find(needed, &ofl->ofl_soneed)) == 0) { 1044 if ((sdf = sdf_add(needed, 1045 &ofl->ofl_soneed)) == (Sdf_desc *)S_ERROR) 1046 return (S_ERROR); 1047 sdf->sdf_rfile = ifl->ifl_name; 1048 } 1049 1050 /* 1051 * Record the runpath (Note that we take the first 1052 * runpath which is exactly what ld.so.1 would do during 1053 * its dependency processing). 1054 */ 1055 if (rpath && (sdf->sdf_rpath == 0)) 1056 sdf->sdf_rpath = rpath; 1057 1058 } else if (dyn->d_tag == DT_FLAGS_1) { 1059 if (dyn->d_un.d_val & (DF_1_INITFIRST | DF_1_INTERPOSE)) 1060 ifl->ifl_flags &= ~FLG_IF_LAZYLD; 1061 if (dyn->d_un.d_val & DF_1_DISPRELPND) 1062 ifl->ifl_flags |= FLG_IF_DISPPEND; 1063 if (dyn->d_un.d_val & DF_1_DISPRELDNE) 1064 ifl->ifl_flags |= FLG_IF_DISPDONE; 1065 if (dyn->d_un.d_val & DF_1_NODIRECT) 1066 ifl->ifl_flags |= FLG_IF_NODIRECT; 1067 1068 } else if ((dyn->d_tag == DT_AUDIT) && 1069 (ifl->ifl_flags & FLG_IF_NEEDED)) { 1070 /* 1071 * Record audit string as DT_DEPAUDIT. 1072 */ 1073 if ((ofl->ofl_depaudit = add_string(ofl->ofl_depaudit, 1074 (str + (size_t)dyn->d_un.d_val))) == 1075 (const char *)S_ERROR) 1076 return (S_ERROR); 1077 1078 } else if (dyn->d_tag == DT_SUNW_RTLDINF) { 1079 /* 1080 * If a library has the SUNW_RTLDINF .dynamic entry 1081 * then we must not permit lazyloading of this library. 1082 * This is because critical startup information (TLS 1083 * routines) are provided as part of these interfaces 1084 * and we must have them as part of process startup. 1085 */ 1086 ifl->ifl_flags &= ~FLG_IF_LAZYLD; 1087 } 1088 } 1089 1090 /* 1091 * Perform some SONAME sanity checks. 1092 */ 1093 if (ifl->ifl_flags & FLG_IF_NEEDED) { 1094 Ifl_desc * sifl; 1095 1096 /* 1097 * Determine if anyone else will cause the same SONAME to be 1098 * used (this is either caused by two different files having the 1099 * same SONAME, or by one file SONAME actually matching another 1100 * file basename (if no SONAME is specified within a shared 1101 * library its basename will be used)). Probably rare, but some 1102 * idiot will do it. 1103 */ 1104 for (LIST_TRAVERSE(&ofl->ofl_sos, lnp, sifl)) { 1105 if ((strcmp(ifl->ifl_soname, sifl->ifl_soname) == 0) && 1106 (ifl != sifl)) { 1107 const char *hint, *iflb, *siflb; 1108 1109 /* 1110 * Determine the basename of each file. Perhaps 1111 * there are multiple copies of the same file 1112 * being brought in using different -L search 1113 * paths, and if so give an extra hint in the 1114 * error message. 1115 */ 1116 iflb = strrchr(ifl->ifl_name, '/'); 1117 if (iflb == NULL) 1118 iflb = ifl->ifl_name; 1119 else 1120 iflb++; 1121 1122 siflb = strrchr(sifl->ifl_name, '/'); 1123 if (siflb == NULL) 1124 siflb = sifl->ifl_name; 1125 else 1126 siflb++; 1127 1128 if (strcmp(iflb, siflb) == 0) 1129 hint = MSG_INTL(MSG_REC_CNFLTHINT); 1130 else 1131 hint = MSG_ORIG(MSG_STR_EMPTY); 1132 1133 eprintf(ofl->ofl_lml, ERR_FATAL, 1134 MSG_INTL(MSG_REC_OBJCNFLT), sifl->ifl_name, 1135 ifl->ifl_name, sifl->ifl_soname, hint); 1136 ofl->ofl_flags |= FLG_OF_FATAL; 1137 return (0); 1138 } 1139 } 1140 1141 /* 1142 * If the SONAME is the same as the name the user wishes to 1143 * record when building a dynamic library (refer -h option), 1144 * we also have a name clash. 1145 */ 1146 if (ofl->ofl_soname && 1147 (strcmp(ofl->ofl_soname, ifl->ifl_soname) == 0)) { 1148 eprintf(ofl->ofl_lml, ERR_FATAL, 1149 MSG_INTL(MSG_REC_OPTCNFLT), ifl->ifl_name, 1150 ifl->ifl_soname); 1151 ofl->ofl_flags |= FLG_OF_FATAL; 1152 return (0); 1153 } 1154 } 1155 return (1); 1156 } 1157 1158 /* 1159 * Process a relocation entry. At this point all input sections from this 1160 * input file have been assigned an input section descriptor which is saved 1161 * in the `ifl_isdesc' array. 1162 */ 1163 static uintptr_t 1164 rel_process(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl) 1165 { 1166 Word rndx; 1167 Is_desc *risc; 1168 Os_desc *osp; 1169 Shdr *shdr = isc->is_shdr; 1170 1171 /* 1172 * Make sure this is a valid relocation we can handle. 1173 */ 1174 if (shdr->sh_type != M_REL_SHT_TYPE) { 1175 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_INVALSEC), 1176 ifl->ifl_name, isc->is_name, 1177 conv_sec_type(ifl->ifl_ehdr->e_machine, shdr->sh_type, 0)); 1178 ofl->ofl_flags |= FLG_OF_FATAL; 1179 return (0); 1180 } 1181 1182 /* 1183 * From the relocation section header information determine which 1184 * section needs the actual relocation. Determine which output section 1185 * this input section has been assigned to and add to its relocation 1186 * list. Note that the relocation section may be null if it is not 1187 * required (ie. .debug, .stabs, etc). 1188 */ 1189 rndx = shdr->sh_info; 1190 if (rndx >= ifl->ifl_shnum) { 1191 /* 1192 * Broken input file. 1193 */ 1194 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_INVSHINFO), 1195 ifl->ifl_name, isc->is_name, EC_XWORD(rndx)); 1196 ofl->ofl_flags |= FLG_OF_FATAL; 1197 return (0); 1198 } 1199 if (rndx == 0) { 1200 if (list_appendc(&ofl->ofl_extrarels, isc) == 0) 1201 return (S_ERROR); 1202 } else if ((risc = ifl->ifl_isdesc[rndx]) != 0) { 1203 /* 1204 * Discard relocations if they are against a section 1205 * which has been discarded. 1206 */ 1207 if (risc->is_flags & FLG_IS_DISCARD) 1208 return (1); 1209 if ((osp = risc->is_osdesc) == 0) { 1210 if (risc->is_shdr->sh_type == SHT_SUNW_move) { 1211 /* 1212 * This section is processed later 1213 * in sunwmove_preprocess() and 1214 * reloc_init(). 1215 */ 1216 if (list_appendc(&ofl->ofl_mvrelisdescs, 1217 isc) == 0) 1218 return (S_ERROR); 1219 return (1); 1220 } 1221 eprintf(ofl->ofl_lml, ERR_FATAL, 1222 MSG_INTL(MSG_FIL_INVRELOC1), ifl->ifl_name, 1223 isc->is_name, risc->is_name); 1224 return (0); 1225 } 1226 if (list_appendc(&osp->os_relisdescs, isc) == 0) 1227 return (S_ERROR); 1228 } 1229 return (1); 1230 } 1231 1232 /* 1233 * SHF_EXCLUDE flags is set for this section. 1234 */ 1235 static uintptr_t 1236 process_exclude(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, 1237 Word ndx, Ofl_desc *ofl) 1238 { 1239 /* 1240 * Sections SHT_SYMTAB and SHT_DYNDYM, even if SHF_EXCLUDE is on, might 1241 * be needed for ld processing. These sections need to be in the 1242 * internal table. Later it will be determined whether they can be 1243 * eliminated or not. 1244 */ 1245 if (shdr->sh_type == SHT_SYMTAB || shdr->sh_type == SHT_DYNSYM) 1246 return (0); 1247 1248 /* 1249 * Other checks 1250 */ 1251 if (shdr->sh_flags & SHF_ALLOC) { 1252 /* 1253 * A conflict, issue an warning message, and ignore the section. 1254 */ 1255 eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_EXCLUDE), 1256 ifl->ifl_name, name); 1257 return (0); 1258 } 1259 1260 /* 1261 * This sections is not going to the output file. 1262 */ 1263 return (process_section(name, ifl, shdr, scn, ndx, 0, ofl)); 1264 } 1265 1266 #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) 1267 1268 static uintptr_t 1269 process_amd64_unwind(const char *name, Ifl_desc *ifl, Shdr *shdr, 1270 Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) 1271 { 1272 Os_desc *osp, *eosp; 1273 Is_desc *isp; 1274 Listnode *lnp; 1275 1276 if (process_section(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) 1277 return (S_ERROR); 1278 1279 /* 1280 * When producing a relocatable object - just collect the sections. 1281 */ 1282 if (ofl->ofl_flags & FLG_OF_RELOBJ) 1283 return (1); 1284 1285 /* 1286 * If producing a executable or shared library, keep track of all the 1287 * output UNWIND sections to allow the creation of the appropriate 1288 * frame_hdr information. 1289 * 1290 * If the section hasn't been placed in the output file, then there's 1291 * nothing for us to do. 1292 */ 1293 if (((isp = ifl->ifl_isdesc[ndx]) == 0) || 1294 ((osp = isp->is_osdesc) == 0)) 1295 return (1); 1296 1297 /* 1298 * Check to see if this output section is already on the list, and if 1299 * not, add it. 1300 */ 1301 for (LIST_TRAVERSE(&ofl->ofl_unwind, lnp, eosp)) 1302 if (osp == eosp) 1303 return (1); 1304 1305 if (list_appendc(&ofl->ofl_unwind, osp) == 0) 1306 return (S_ERROR); 1307 1308 return (1); 1309 } 1310 1311 #endif 1312 1313 /* 1314 * Section processing state table. `Initial' describes the required initial 1315 * procedure to be called (if any), `Final' describes the final processing 1316 * procedure (ie. things that can only be done when all required sections 1317 * have been collected). 1318 */ 1319 static uintptr_t (*Initial[SHT_NUM][2])() = { 1320 1321 /* ET_REL ET_DYN */ 1322 1323 /* SHT_NULL */ invalid_section, invalid_section, 1324 /* SHT_PROGBITS */ process_progbits, process_progbits, 1325 /* SHT_SYMTAB */ process_input, process_input, 1326 /* SHT_STRTAB */ process_strtab, process_strtab, 1327 /* SHT_RELA */ process_reloc, process_reloc, 1328 /* SHT_HASH */ invalid_section, NULL, 1329 /* SHT_DYNAMIC */ process_rel_dynamic, process_section, 1330 /* SHT_NOTE */ process_section, NULL, 1331 /* SHT_NOBITS */ process_nobits, process_nobits, 1332 /* SHT_REL */ process_reloc, process_reloc, 1333 /* SHT_SHLIB */ process_section, invalid_section, 1334 /* SHT_DYNSYM */ invalid_section, process_input, 1335 /* SHT_UNKNOWN12 */ process_progbits, process_progbits, 1336 /* SHT_UNKNOWN13 */ process_progbits, process_progbits, 1337 /* SHT_INIT_ARRAY */ process_array, NULL, 1338 /* SHT_FINI_ARRAY */ process_array, NULL, 1339 /* SHT_PREINIT_ARRAY */ process_array, NULL, 1340 /* SHT_GROUP */ process_section, invalid_section, 1341 /* SHT_SYMTAB_SHNDX */ process_sym_shndx, NULL 1342 }; 1343 1344 static uintptr_t (*Final[SHT_NUM][2])() = { 1345 1346 /* SHT_NULL */ NULL, NULL, 1347 /* SHT_PROGBITS */ NULL, NULL, 1348 /* SHT_SYMTAB */ ld_sym_process, ld_sym_process, 1349 /* SHT_STRTAB */ NULL, NULL, 1350 /* SHT_RELA */ rel_process, NULL, 1351 /* SHT_HASH */ NULL, NULL, 1352 /* SHT_DYNAMIC */ NULL, process_dynamic, 1353 /* SHT_NOTE */ NULL, NULL, 1354 /* SHT_NOBITS */ NULL, NULL, 1355 /* SHT_REL */ rel_process, NULL, 1356 /* SHT_SHLIB */ NULL, NULL, 1357 /* SHT_DYNSYM */ NULL, ld_sym_process, 1358 /* SHT_UNKNOWN12 */ NULL, NULL, 1359 /* SHT_UNKNOWN13 */ NULL, NULL, 1360 /* SHT_INIT_ARRAY */ NULL, NULL, 1361 /* SHT_FINI_ARRAY */ NULL, NULL, 1362 /* SHT_PREINIT_ARRAY */ NULL, NULL, 1363 /* SHT_GROUP */ NULL, NULL, 1364 /* SHT_SYMTAB_SHNDX */ sym_shndx_process, NULL 1365 }; 1366 1367 #define MAXNDXSIZE 10 1368 1369 /* 1370 * Process an elf file. Each section is compared against the section state 1371 * table to determine whether it should be processed (saved), ignored, or 1372 * is invalid for the type of input file being processed. 1373 */ 1374 static uintptr_t 1375 process_elf(Ifl_desc *ifl, Elf *elf, Ofl_desc *ofl) 1376 { 1377 Elf_Scn *scn; 1378 Shdr *shdr; 1379 Word ndx, sndx; 1380 char *str, *name, _name[MAXNDXSIZE]; 1381 Word row, column; 1382 int ident; 1383 uintptr_t error; 1384 Is_desc *vdfisp, *vndisp, *vsyisp, *sifisp, * capisp; 1385 Sdf_desc *sdf; 1386 Word ordered_shndx = 0; /* index to first ordered section */ 1387 Word ordered_cnt = 0; 1388 1389 /* 1390 * First process the .shstrtab section so that later sections can 1391 * reference their name. 1392 */ 1393 ld_sup_file(ofl, ifl->ifl_name, elf_kind(elf), ifl->ifl_flags, elf); 1394 1395 sndx = ifl->ifl_shstrndx; 1396 if ((scn = elf_getscn(elf, (size_t)sndx)) == NULL) { 1397 eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSCN), 1398 ifl->ifl_name); 1399 ofl->ofl_flags |= FLG_OF_FATAL; 1400 return (0); 1401 } 1402 if ((shdr = elf_getshdr(scn)) == NULL) { 1403 eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSHDR), 1404 ifl->ifl_name); 1405 ofl->ofl_flags |= FLG_OF_FATAL; 1406 return (0); 1407 } 1408 if ((name = elf_strptr(elf, (size_t)sndx, (size_t)shdr->sh_name)) == 1409 NULL) { 1410 eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_STRPTR), 1411 ifl->ifl_name); 1412 ofl->ofl_flags |= FLG_OF_FATAL; 1413 return (0); 1414 } 1415 1416 if (ld_sup_input_section(ofl, ifl, name, &shdr, sndx, scn, 1417 elf) == S_ERROR) 1418 return (S_ERROR); 1419 1420 /* 1421 * Reset the name since the shdr->sh_name could have been changed as 1422 * part of ld_sup_input_section(). If there is no name, fabricate one 1423 * using the section index. 1424 */ 1425 if (shdr->sh_name == 0) { 1426 (void) snprintf(_name, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), 1427 EC_XWORD(sndx)); 1428 if ((name = libld_malloc(strlen(_name) + 1)) == 0) 1429 return (S_ERROR); 1430 (void) strcpy(name, _name); 1431 1432 } else if ((name = elf_strptr(elf, (size_t)sndx, 1433 (size_t)shdr->sh_name)) == NULL) { 1434 eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_STRPTR), 1435 ifl->ifl_name); 1436 ofl->ofl_flags |= FLG_OF_FATAL; 1437 return (0); 1438 } 1439 1440 error = process_strtab(name, ifl, shdr, scn, sndx, FALSE, ofl); 1441 if ((error == 0) || (error == S_ERROR)) 1442 return (error); 1443 str = ifl->ifl_isdesc[sndx]->is_indata->d_buf; 1444 1445 /* 1446 * Determine the state table column from the input file type. Note, 1447 * shared library sections are not added to the output section list. 1448 */ 1449 if (ifl->ifl_ehdr->e_type == ET_DYN) { 1450 column = 1; 1451 ofl->ofl_soscnt++; 1452 ident = M_ID_NULL; 1453 } else { 1454 column = 0; 1455 ofl->ofl_objscnt++; 1456 ident = M_ID_UNKNOWN; 1457 } 1458 1459 DBG_CALL(Dbg_file_generic(ofl->ofl_lml, ifl)); 1460 ndx = 0; 1461 vdfisp = vndisp = vsyisp = sifisp = capisp = 0; 1462 scn = NULL; 1463 while (scn = elf_nextscn(elf, scn)) { 1464 ndx++; 1465 /* 1466 * As we've already processed the .shstrtab don't do it again. 1467 */ 1468 if (ndx == sndx) 1469 continue; 1470 1471 if ((shdr = elf_getshdr(scn)) == NULL) { 1472 eprintf(ofl->ofl_lml, ERR_ELF, 1473 MSG_INTL(MSG_ELF_GETSHDR), ifl->ifl_name); 1474 ofl->ofl_flags |= FLG_OF_FATAL; 1475 return (0); 1476 } 1477 name = str + (size_t)(shdr->sh_name); 1478 1479 if (ld_sup_input_section(ofl, ifl, name, &shdr, ndx, scn, 1480 elf) == S_ERROR) 1481 return (S_ERROR); 1482 1483 /* 1484 * Reset the name since the shdr->sh_name could have been 1485 * changed as part of ld_sup_input_section(). If there is no 1486 * name, fabricate one using the section index. 1487 */ 1488 if (shdr->sh_name == 0) { 1489 (void) snprintf(_name, MAXNDXSIZE, 1490 MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(ndx)); 1491 if ((name = libld_malloc(strlen(_name) + 1)) == 0) 1492 return (S_ERROR); 1493 (void) strcpy(name, _name); 1494 } else 1495 name = str + (size_t)(shdr->sh_name); 1496 1497 row = shdr->sh_type; 1498 1499 /* 1500 * If the section has the SHF_EXCLUDE flag on, and we're not 1501 * generating a relocatable object, exclude the section. 1502 */ 1503 if (((shdr->sh_flags & SHF_EXCLUDE) != 0) && 1504 ((ofl->ofl_flags & FLG_OF_RELOBJ) == 0)) { 1505 if ((error = process_exclude(name, ifl, shdr, scn, 1506 ndx, ofl)) == S_ERROR) 1507 return (S_ERROR); 1508 if (error == 1) 1509 continue; 1510 } 1511 1512 /* 1513 * If this is a standard section type process it via the 1514 * appropriate action routine. 1515 */ 1516 if (row < SHT_NUM) { 1517 if (Initial[row][column] != NULL) { 1518 if (Initial[row][column](name, ifl, shdr, scn, 1519 ndx, ident, ofl) == S_ERROR) 1520 return (S_ERROR); 1521 } 1522 } else { 1523 /* 1524 * If this section is below SHT_LOSUNW then we don't 1525 * really know what to do with it, issue a warning 1526 * message but do the basic section processing anyway. 1527 */ 1528 if (row < (Word)SHT_LOSUNW) 1529 eprintf(ofl->ofl_lml, ERR_WARNING, 1530 MSG_INTL(MSG_FIL_INVALSEC), ifl->ifl_name, 1531 name, 1532 conv_sec_type(ifl->ifl_ehdr->e_machine, 1533 shdr->sh_type, 0)); 1534 1535 /* 1536 * Handle sections greater than SHT_LOSUNW. 1537 */ 1538 switch (row) { 1539 case SHT_SUNW_dof: 1540 if (process_section(name, ifl, shdr, scn, 1541 ndx, ident, ofl) == S_ERROR) 1542 return (S_ERROR); 1543 break; 1544 case SHT_SUNW_cap: 1545 if (process_section(name, ifl, shdr, scn, 1546 ndx, M_ID_NULL, ofl) == S_ERROR) 1547 return (S_ERROR); 1548 capisp = ifl->ifl_isdesc[ndx]; 1549 break; 1550 case SHT_SUNW_DEBUGSTR: 1551 case SHT_SUNW_DEBUG: 1552 if (process_debug(name, ifl, shdr, scn, 1553 ndx, ident, ofl) == S_ERROR) 1554 return (S_ERROR); 1555 break; 1556 case SHT_SUNW_move: 1557 if (process_section(name, ifl, shdr, scn, 1558 ndx, M_ID_NULL, ofl) == S_ERROR) 1559 return (S_ERROR); 1560 break; 1561 case SHT_SUNW_syminfo: 1562 if (process_section(name, ifl, shdr, scn, 1563 ndx, M_ID_NULL, ofl) == S_ERROR) 1564 return (S_ERROR); 1565 sifisp = ifl->ifl_isdesc[ndx]; 1566 break; 1567 case SHT_SUNW_ANNOTATE: 1568 case SHT_SUNW_COMDAT: 1569 if (process_progbits(name, ifl, shdr, scn, 1570 ndx, ident, ofl) == S_ERROR) 1571 return (S_ERROR); 1572 break; 1573 case SHT_SUNW_verdef: 1574 if (process_section(name, ifl, shdr, scn, 1575 ndx, M_ID_NULL, ofl) == S_ERROR) 1576 return (S_ERROR); 1577 vdfisp = ifl->ifl_isdesc[ndx]; 1578 break; 1579 case SHT_SUNW_verneed: 1580 if (process_section(name, ifl, shdr, scn, 1581 ndx, M_ID_NULL, ofl) == S_ERROR) 1582 return (S_ERROR); 1583 vndisp = ifl->ifl_isdesc[ndx]; 1584 break; 1585 case SHT_SUNW_versym: 1586 if (process_section(name, ifl, shdr, scn, 1587 ndx, M_ID_NULL, ofl) == S_ERROR) 1588 return (S_ERROR); 1589 vsyisp = ifl->ifl_isdesc[ndx]; 1590 break; 1591 #if defined(sparc) 1592 case SHT_SPARC_GOTDATA: 1593 if (process_section(name, ifl, shdr, scn, 1594 ndx, M_ID_GOTDATA, ofl) == S_ERROR) 1595 return (S_ERROR); 1596 break; 1597 #endif 1598 #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) 1599 case SHT_AMD64_UNWIND: 1600 if (column == 0) { 1601 /* 1602 * column == ET_REL 1603 */ 1604 if (process_amd64_unwind(name, ifl, 1605 shdr, scn, ndx, M_ID_UNWIND, 1606 ofl) == S_ERROR) 1607 return (S_ERROR); 1608 } 1609 break; 1610 #endif 1611 default: 1612 if (ident != M_ID_NULL) 1613 ident = M_ID_USER; 1614 if (process_section(name, ifl, shdr, scn, 1615 ndx, ident, ofl) == S_ERROR) 1616 return (S_ERROR); 1617 break; 1618 } 1619 } 1620 1621 /* 1622 * If we have any sections that require ORDERED processing, 1623 * remember the index of the first ordered section. This let's 1624 * us know if we need an ORDERED place_section pass, and if so, 1625 * where to start. 1626 */ 1627 if (ifl->ifl_isdesc[ndx] && 1628 (ifl->ifl_isdesc[ndx]->is_shdr->sh_flags & ALL_SHF_ORDER)) { 1629 ordered_cnt++; 1630 if (ordered_shndx == 0) 1631 ordered_shndx = ndx; 1632 } 1633 } 1634 1635 /* 1636 * Now that all of sections have been placed, scan through any sections 1637 * which have special ordering requirements and place them now. 1638 */ 1639 if (ordered_shndx) { 1640 Word cnt; 1641 1642 for (ndx = ordered_shndx, cnt = 0; 1643 (ndx < ifl->ifl_shnum) && (cnt < ordered_cnt); ndx++) { 1644 Is_desc *isp; 1645 /* LINTED */ 1646 Os_desc *osp; 1647 1648 if (((isp = ifl->ifl_isdesc[ndx]) == 0) || 1649 ((isp->is_shdr->sh_flags & ALL_SHF_ORDER) == 0)) 1650 continue; 1651 1652 /* 1653 * If this is an ordered section, process it. 1654 */ 1655 cnt++; 1656 if ((osp = (Os_desc *)ld_process_ordered(ifl, ofl, ndx, 1657 ifl->ifl_shnum)) == (Os_desc *)S_ERROR) 1658 return (S_ERROR); 1659 1660 #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) 1661 /* 1662 * If this section is 'ordered' then it was not 1663 * caught in the previous 'place_section' operation. 1664 * 1665 * So - now that we have a OSP section for 1666 * the unwind info - record it. 1667 */ 1668 if (osp && 1669 (osp->os_shdr->sh_type == SHT_AMD64_UNWIND) && 1670 (append_amd64_unwind(osp, ofl) == S_ERROR)) 1671 return (S_ERROR); 1672 #endif 1673 } 1674 } 1675 1676 /* 1677 * If this is an explicit shared object determine if the user has 1678 * specified a control definition. This descriptor may specify which 1679 * version definitions can be used from this object (it may also update 1680 * the dependency to USED and supply an alternative SONAME). 1681 */ 1682 sdf = 0; 1683 if (column && (ifl->ifl_flags & FLG_IF_NEEDED)) { 1684 const char *base; 1685 1686 /* 1687 * Use the basename of the input file (typically this is the 1688 * compilation environment name, ie. libfoo.so). 1689 */ 1690 if ((base = strrchr(ifl->ifl_name, '/')) == NULL) 1691 base = ifl->ifl_name; 1692 else 1693 base++; 1694 1695 if ((sdf = sdf_find(base, &ofl->ofl_socntl)) != 0) { 1696 sdf->sdf_file = ifl; 1697 ifl->ifl_sdfdesc = sdf; 1698 } 1699 } 1700 1701 /* 1702 * Process any hardware/software capabilities sections. Only propagate 1703 * capabilities for input relocatable objects. If the object doesn't 1704 * contain any capabilities, any capability state that has already been 1705 * gathered will prevail. 1706 */ 1707 if (capisp && (ifl->ifl_ehdr->e_type == ET_REL)) 1708 process_cap(name, ifl, capisp, ofl); 1709 1710 /* 1711 * Process any version dependencies. These will establish shared object 1712 * `needed' entries in the same manner as will be generated from the 1713 * .dynamic's NEEDED entries. 1714 */ 1715 if (vndisp && (ofl->ofl_flags & (FLG_OF_NOUNDEF | FLG_OF_SYMBOLIC))) 1716 if (ld_vers_need_process(vndisp, ifl, ofl) == S_ERROR) 1717 return (S_ERROR); 1718 1719 /* 1720 * Before processing any symbol resolution or relocations process any 1721 * version sections. 1722 */ 1723 if (vsyisp) 1724 (void) ld_vers_sym_process(ofl->ofl_lml, vsyisp, ifl); 1725 1726 if (ifl->ifl_versym && 1727 (vdfisp || (sdf && (sdf->sdf_flags & FLG_SDF_SELECT)))) 1728 if (ld_vers_def_process(vdfisp, ifl, ofl) == S_ERROR) 1729 return (S_ERROR); 1730 1731 /* 1732 * Having collected the appropriate sections carry out any additional 1733 * processing if necessary. 1734 */ 1735 for (ndx = 0; ndx < ifl->ifl_shnum; ndx++) { 1736 Is_desc * isp; 1737 1738 if ((isp = ifl->ifl_isdesc[ndx]) == 0) 1739 continue; 1740 row = isp->is_shdr->sh_type; 1741 1742 if ((isp->is_flags & FLG_IS_DISCARD) == 0) 1743 ld_sup_section(ofl, isp->is_name, isp->is_shdr, ndx, 1744 isp->is_indata, elf); 1745 1746 /* 1747 * If this is a ST_SUNW_move section from a 1748 * a relocatable file, keep the input section. 1749 */ 1750 if ((row == SHT_SUNW_move) && (column == 0)) { 1751 if (list_appendc(&(ofl->ofl_ismove), isp) == 0) 1752 return (S_ERROR); 1753 } 1754 1755 /* 1756 * If this is a standard section type process it via the 1757 * appropriate action routine. 1758 */ 1759 if (row < SHT_NUM) { 1760 if (Final[row][column] != NULL) 1761 if (Final[row][column](isp, ifl, ofl) == 1762 S_ERROR) 1763 return (S_ERROR); 1764 } 1765 } 1766 1767 /* 1768 * After processing any symbol resolution, and if this dependency 1769 * indicates it contains symbols that can't be directly bound to, 1770 * set the symbols appropriately. 1771 */ 1772 if (sifisp && ((ifl->ifl_flags & (FLG_IF_NEEDED | FLG_IF_NODIRECT)) == 1773 (FLG_IF_NEEDED | FLG_IF_NODIRECT))) 1774 (void) ld_sym_nodirect(sifisp, ifl, ofl); 1775 1776 return (1); 1777 } 1778 1779 /* 1780 * Process the current input file. There are basically three types of files 1781 * that come through here: 1782 * 1783 * o files explicitly defined on the command line (ie. foo.o or bar.so), 1784 * in this case only the `name' field is valid. 1785 * 1786 * o libraries determined from the -l command line option (ie. -lbar), 1787 * in this case the `soname' field contains the basename of the located 1788 * file. 1789 * 1790 * Any shared object specified via the above two conventions must be recorded 1791 * as a needed dependency. 1792 * 1793 * o libraries specified as dependencies of those libraries already obtained 1794 * via the command line (ie. bar.so has a DT_NEEDED entry of fred.so.1), 1795 * in this case the `soname' field contains either a full pathname (if the 1796 * needed entry contained a `/'), or the basename of the located file. 1797 * These libraries are processed to verify symbol binding but are not 1798 * recorded as dependencies of the output file being generated. 1799 */ 1800 Ifl_desc * 1801 ld_process_ifl(const char *name, const char *soname, int fd, Elf *elf, 1802 Half flags, Ofl_desc * ofl, Rej_desc * rej) 1803 { 1804 Ifl_desc *ifl; 1805 Ehdr *ehdr; 1806 Listnode *lnp; 1807 uintptr_t error = 0; 1808 struct stat status; 1809 Ar_desc *adp; 1810 Rej_desc _rej; 1811 1812 /* 1813 * If this file was not extracted from an archive obtain its device 1814 * information. This will be used to determine if the file has already 1815 * been processed (rather than simply comparing filenames, the device 1816 * information provides a quicker comparison and detects linked files). 1817 */ 1818 if (!(flags & FLG_IF_EXTRACT)) 1819 (void) fstat(fd, &status); 1820 else { 1821 status.st_dev = 0; 1822 status.st_ino = 0; 1823 } 1824 1825 switch (elf_kind(elf)) { 1826 case ELF_K_AR: 1827 /* 1828 * Determine if we've already come across this archive file. 1829 */ 1830 if (!(flags & FLG_IF_EXTRACT)) { 1831 for (LIST_TRAVERSE(&ofl->ofl_ars, lnp, adp)) { 1832 if ((adp->ad_stdev != status.st_dev) || 1833 (adp->ad_stino != status.st_ino)) 1834 continue; 1835 1836 /* 1837 * We've seen this file before so reuse the 1838 * original archive descriptor and discard the 1839 * new elf descriptor. 1840 */ 1841 DBG_CALL(Dbg_file_reuse(ofl->ofl_lml, name, 1842 adp->ad_name)); 1843 (void) elf_end(elf); 1844 return ((Ifl_desc *)ld_process_archive(name, fd, 1845 adp, ofl)); 1846 } 1847 } 1848 1849 /* 1850 * As we haven't processed this file before establish a new 1851 * archive descriptor. 1852 */ 1853 adp = ld_ar_setup(name, elf, ofl); 1854 if ((adp == 0) || (adp == (Ar_desc *)S_ERROR)) 1855 return ((Ifl_desc *)adp); 1856 adp->ad_stdev = status.st_dev; 1857 adp->ad_stino = status.st_ino; 1858 1859 ld_sup_file(ofl, name, ELF_K_AR, flags, elf); 1860 1861 return ((Ifl_desc *)ld_process_archive(name, fd, adp, ofl)); 1862 1863 case ELF_K_ELF: 1864 /* 1865 * Obtain the elf header so that we can determine what type of 1866 * elf ELF_K_ELF file this is. 1867 */ 1868 if ((ehdr = elf_getehdr(elf)) == NULL) { 1869 int _class = gelf_getclass(elf); 1870 1871 /* 1872 * Failure could occur for a number of reasons at this 1873 * point. Typically the files class is incorrect (ie. 1874 * user is building 64-bit but managed to pint at 32-bit 1875 * libraries). However any number of elf errors can 1876 * also occur, such as from a truncated or corrupt file. 1877 * Here we try and get the best error message possible. 1878 */ 1879 if (M_CLASS != _class) { 1880 _rej.rej_type = SGS_REJ_CLASS; 1881 _rej.rej_info = (uint_t)_class; 1882 } else { 1883 _rej.rej_type = SGS_REJ_STR; 1884 _rej.rej_str = elf_errmsg(-1); 1885 } 1886 _rej.rej_name = name; 1887 DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); 1888 if (rej->rej_type == 0) { 1889 *rej = _rej; 1890 rej->rej_name = strdup(_rej.rej_name); 1891 } 1892 return (0); 1893 } 1894 1895 /* 1896 * Determine if we've already come across this file. 1897 */ 1898 if (!(flags & FLG_IF_EXTRACT)) { 1899 List * lst; 1900 1901 if (ehdr->e_type == ET_REL) 1902 lst = &ofl->ofl_objs; 1903 else 1904 lst = &ofl->ofl_sos; 1905 1906 /* 1907 * Traverse the appropriate file list and determine if 1908 * a dev/inode match is found. 1909 */ 1910 for (LIST_TRAVERSE(lst, lnp, ifl)) { 1911 /* 1912 * Ifl_desc generated via -Nneed, therefore no 1913 * actual file behind it. 1914 */ 1915 if (ifl->ifl_flags & FLG_IF_NEEDSTR) 1916 continue; 1917 1918 if ((ifl->ifl_stino != status.st_ino) || 1919 (ifl->ifl_stdev != status.st_dev)) 1920 continue; 1921 1922 /* 1923 * Disregard (skip) this image. 1924 */ 1925 DBG_CALL(Dbg_file_skip(ofl->ofl_lml, 1926 ifl->ifl_name, name)); 1927 (void) elf_end(elf); 1928 1929 /* 1930 * If the file was explicitly defined on the 1931 * command line (this is always the case for 1932 * relocatable objects, and is true for shared 1933 * objects when they weren't specified via -l or 1934 * were dragged in as an implicit dependency), 1935 * then warn the user. 1936 */ 1937 if ((flags & FLG_IF_CMDLINE) || 1938 (ifl->ifl_flags & FLG_IF_CMDLINE)) { 1939 const char *errmsg; 1940 1941 /* 1942 * Determine whether this is the same 1943 * file name as originally encountered 1944 * so as to provide the most 1945 * descriptive diagnostic. 1946 */ 1947 if (strcmp(name, ifl->ifl_name) == 0) 1948 errmsg = MSG_INTL(MSG_FIL_MULINC_1); 1949 else 1950 errmsg = MSG_INTL(MSG_FIL_MULINC_2); 1951 1952 eprintf(ofl->ofl_lml, ERR_WARNING, 1953 errmsg, name, ifl->ifl_name); 1954 } 1955 return (ifl); 1956 } 1957 } 1958 1959 /* 1960 * At this point, we know we need the file. Establish an input 1961 * file descriptor and continue processing. 1962 */ 1963 ifl = ifl_setup(name, ehdr, elf, flags, ofl, rej); 1964 if ((ifl == 0) || (ifl == (Ifl_desc *)S_ERROR)) 1965 return (ifl); 1966 ifl->ifl_stdev = status.st_dev; 1967 ifl->ifl_stino = status.st_ino; 1968 1969 /* 1970 * If -zignore is in effect, mark this file as a potential 1971 * candidate (the files use isn't actually determined until 1972 * symbol resolution and relocation processing are completed). 1973 */ 1974 if (ofl->ofl_flags1 & FLG_OF1_IGNORE) 1975 ifl->ifl_flags |= FLG_IF_IGNORE; 1976 1977 switch (ehdr->e_type) { 1978 case ET_REL: 1979 ld_mach_eflags(ehdr, ofl); 1980 error = process_elf(ifl, elf, ofl); 1981 break; 1982 case ET_DYN: 1983 if ((ofl->ofl_flags & FLG_OF_STATIC) || 1984 !(ofl->ofl_flags & FLG_OF_DYNLIBS)) { 1985 eprintf(ofl->ofl_lml, ERR_FATAL, 1986 MSG_INTL(MSG_FIL_SOINSTAT), name); 1987 ofl->ofl_flags |= FLG_OF_FATAL; 1988 return (0); 1989 } 1990 1991 /* 1992 * Record any additional shared object information. 1993 * If no soname is specified (eg. this file was 1994 * derived from a explicit filename declaration on the 1995 * command line, ie. bar.so) use the pathname. 1996 * This entry may be overridden if the files dynamic 1997 * section specifies an DT_SONAME value. 1998 */ 1999 if (soname == NULL) 2000 ifl->ifl_soname = ifl->ifl_name; 2001 else 2002 ifl->ifl_soname = soname; 2003 2004 /* 2005 * If direct bindings, lazy loading, or group 2006 * permissions need to be established, mark this object. 2007 */ 2008 if (ofl->ofl_flags1 & FLG_OF1_ZDIRECT) 2009 ifl->ifl_flags |= FLG_IF_DIRECT; 2010 if (ofl->ofl_flags1 & FLG_OF1_LAZYLD) 2011 ifl->ifl_flags |= FLG_IF_LAZYLD; 2012 if (ofl->ofl_flags1 & FLG_OF1_GRPPRM) 2013 ifl->ifl_flags |= FLG_IF_GRPPRM; 2014 error = process_elf(ifl, elf, ofl); 2015 2016 /* 2017 * At this point we know if this file will be 2018 * lazyloaded, or whether bindings to it must be direct. 2019 * In either case, a syminfo section is required. 2020 */ 2021 if (ifl->ifl_flags & (FLG_IF_LAZYLD | FLG_IF_DIRECT)) 2022 ofl->ofl_flags |= FLG_OF_SYMINFO; 2023 2024 break; 2025 default: 2026 (void) elf_errno(); 2027 _rej.rej_type = SGS_REJ_UNKFILE; 2028 _rej.rej_name = name; 2029 DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); 2030 if (rej->rej_type == 0) { 2031 *rej = _rej; 2032 rej->rej_name = strdup(_rej.rej_name); 2033 } 2034 return (0); 2035 } 2036 break; 2037 default: 2038 (void) elf_errno(); 2039 _rej.rej_type = SGS_REJ_UNKFILE; 2040 _rej.rej_name = name; 2041 DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); 2042 if (rej->rej_type == 0) { 2043 *rej = _rej; 2044 rej->rej_name = strdup(_rej.rej_name); 2045 } 2046 return (0); 2047 } 2048 if ((error == 0) || (error == S_ERROR)) 2049 return ((Ifl_desc *)error); 2050 else 2051 return (ifl); 2052 } 2053 2054 /* 2055 * Having successfully opened a file, set up the necessary elf structures to 2056 * process it further. This small section of processing is slightly different 2057 * from the elf initialization required to process a relocatable object from an 2058 * archive (see libs.c: ld_process_archive()). 2059 */ 2060 Ifl_desc * 2061 ld_process_open(const char *opath, const char *ofile, int *fd, Ofl_desc *ofl, 2062 Half flags, Rej_desc *rej) 2063 { 2064 Elf *elf; 2065 const char *npath = opath; 2066 const char *nfile = ofile; 2067 2068 if ((elf = elf_begin(*fd, ELF_C_READ, NULL)) == NULL) { 2069 eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_BEGIN), npath); 2070 ofl->ofl_flags |= FLG_OF_FATAL; 2071 return (0); 2072 } 2073 2074 /* 2075 * Determine whether the support library wishes to process this open. 2076 * The support library may return: 2077 * . a different ELF descriptor (in which case they should have 2078 * closed the original) 2079 * . a different file descriptor (in which case they should have 2080 * closed the original) 2081 * . a different path and file name (presumably associated with 2082 * a different file descriptor) 2083 * 2084 * A file descriptor of -1, or and ELF descriptor of zero indicates 2085 * the file should be ignored. 2086 */ 2087 ld_sup_open(ofl, &npath, &nfile, fd, flags, &elf, NULL, 0, 2088 elf_kind(elf)); 2089 2090 if ((*fd == -1) || (elf == NULL)) 2091 return (0); 2092 2093 return (ld_process_ifl(npath, nfile, *fd, elf, flags, ofl, rej)); 2094 } 2095 2096 /* 2097 * Process a required library (i.e. the dependency of a shared object). 2098 * Combine the directory and filename, check the resultant path size, and try 2099 * opening the pathname. 2100 */ 2101 static Ifl_desc * 2102 process_req_lib(Sdf_desc *sdf, const char *dir, const char *file, 2103 Ofl_desc * ofl, Rej_desc * rej) 2104 { 2105 size_t dlen, plen; 2106 int fd; 2107 char path[PATH_MAX]; 2108 const char *_dir = dir; 2109 2110 /* 2111 * Determine the sizes of the directory and filename to insure we don't 2112 * exceed our buffer. 2113 */ 2114 if ((dlen = strlen(dir)) == 0) { 2115 _dir = MSG_ORIG(MSG_STR_DOT); 2116 dlen = 1; 2117 } 2118 dlen++; 2119 plen = dlen + strlen(file) + 1; 2120 if (plen > PATH_MAX) { 2121 eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_PTHTOLONG), 2122 _dir, file); 2123 ofl->ofl_flags |= FLG_OF_FATAL; 2124 return (0); 2125 } 2126 2127 /* 2128 * Build the entire pathname and try and open the file. 2129 */ 2130 (void) strcpy(path, _dir); 2131 (void) strcat(path, MSG_ORIG(MSG_STR_SLASH)); 2132 (void) strcat(path, file); 2133 DBG_CALL(Dbg_libs_req(ofl->ofl_lml, sdf->sdf_name, 2134 sdf->sdf_rfile, path)); 2135 2136 if ((fd = open(path, O_RDONLY)) == -1) 2137 return (0); 2138 else { 2139 Ifl_desc *ifl; 2140 char *_path; 2141 2142 if ((_path = libld_malloc(strlen(path) + 1)) == 0) 2143 return ((Ifl_desc *)S_ERROR); 2144 (void) strcpy(_path, path); 2145 ifl = ld_process_open(_path, &_path[dlen], &fd, ofl, NULL, rej); 2146 if (fd != -1) 2147 (void) close(fd); 2148 return (ifl); 2149 } 2150 } 2151 2152 /* 2153 * Finish any library processing. Walk the list of so's that have been listed 2154 * as "included" by shared objects we have previously processed. Examine them, 2155 * without adding them as explicit dependents of this program, in order to 2156 * complete our symbol definition process. The search path rules are: 2157 * 2158 * o use any user supplied paths, i.e. LD_LIBRARY_PATH and -L, then 2159 * 2160 * o use any RPATH defined within the parent shared object, then 2161 * 2162 * o use the default directories, i.e. LIBPATH or -YP. 2163 */ 2164 uintptr_t 2165 ld_finish_libs(Ofl_desc *ofl) 2166 { 2167 Listnode *lnp1; 2168 Sdf_desc *sdf; 2169 Rej_desc rej = { 0 }; 2170 2171 /* 2172 * Make sure we are back in dynamic mode. 2173 */ 2174 ofl->ofl_flags |= FLG_OF_DYNLIBS; 2175 2176 for (LIST_TRAVERSE(&ofl->ofl_soneed, lnp1, sdf)) { 2177 Listnode *lnp2; 2178 char *path, *slash = NULL; 2179 int fd; 2180 Ifl_desc *ifl; 2181 char *file = (char *)sdf->sdf_name; 2182 2183 /* 2184 * See if this file has already been processed. At the time 2185 * this implicit dependency was determined there may still have 2186 * been more explicit dependencies to process. Note, if we ever 2187 * do parse the command line three times we would be able to 2188 * do all this checking when processing the dynamic section. 2189 */ 2190 if (sdf->sdf_file) 2191 continue; 2192 2193 for (LIST_TRAVERSE(&ofl->ofl_sos, lnp2, ifl)) { 2194 if (!(ifl->ifl_flags & FLG_IF_NEEDSTR) && 2195 (strcmp(file, ifl->ifl_soname) == 0)) { 2196 sdf->sdf_file = ifl; 2197 break; 2198 } 2199 } 2200 if (sdf->sdf_file) 2201 continue; 2202 2203 /* 2204 * If the current path name element embeds a "/", then it's to 2205 * be taken "as is", with no searching involved. Process all 2206 * "/" occurrences, so that we can deduce the base file name. 2207 */ 2208 for (path = file; *path; path++) { 2209 if (*path == '/') 2210 slash = path; 2211 } 2212 if (slash) { 2213 DBG_CALL(Dbg_libs_req(ofl->ofl_lml, sdf->sdf_name, 2214 sdf->sdf_rfile, file)); 2215 if ((fd = open(file, O_RDONLY)) == -1) { 2216 eprintf(ofl->ofl_lml, ERR_WARNING, 2217 MSG_INTL(MSG_FIL_NOTFOUND), file, 2218 sdf->sdf_rfile); 2219 } else { 2220 Rej_desc _rej = { 0 }; 2221 2222 ifl = ld_process_open(file, ++slash, &fd, ofl, 2223 NULL, &_rej); 2224 if (fd != -1) 2225 (void) close(fd); 2226 2227 if (ifl == (Ifl_desc *)S_ERROR) { 2228 return (S_ERROR); 2229 } 2230 if (_rej.rej_type) { 2231 eprintf(ofl->ofl_lml, ERR_WARNING, 2232 MSG_INTL(reject[_rej.rej_type]), 2233 _rej.rej_name ? rej.rej_name : 2234 MSG_INTL(MSG_STR_UNKNOWN), 2235 conv_reject_desc(&_rej)); 2236 } else 2237 sdf->sdf_file = ifl; 2238 } 2239 continue; 2240 } 2241 2242 /* 2243 * Now search for this file in any user defined directories. 2244 */ 2245 for (LIST_TRAVERSE(&ofl->ofl_ulibdirs, lnp2, path)) { 2246 Rej_desc _rej = { 0 }; 2247 2248 ifl = process_req_lib(sdf, path, file, ofl, &_rej); 2249 if (ifl == (Ifl_desc *)S_ERROR) { 2250 return (S_ERROR); 2251 } 2252 if (_rej.rej_type) { 2253 if (rej.rej_type == 0) { 2254 rej = _rej; 2255 rej.rej_name = strdup(_rej.rej_name); 2256 } 2257 } 2258 if (ifl) { 2259 sdf->sdf_file = ifl; 2260 break; 2261 } 2262 } 2263 if (sdf->sdf_file) 2264 continue; 2265 2266 /* 2267 * Next use the local rules defined within the parent shared 2268 * object. 2269 */ 2270 if (sdf->sdf_rpath != NULL) { 2271 char *rpath, *next; 2272 2273 rpath = libld_malloc(strlen(sdf->sdf_rpath) + 1); 2274 if (rpath == 0) 2275 return (S_ERROR); 2276 (void) strcpy(rpath, sdf->sdf_rpath); 2277 DBG_CALL(Dbg_libs_path(ofl->ofl_lml, rpath, 2278 LA_SER_RUNPATH, sdf->sdf_rfile)); 2279 if ((path = strtok_r(rpath, 2280 MSG_ORIG(MSG_STR_COLON), &next)) != NULL) { 2281 do { 2282 Rej_desc _rej = { 0 }; 2283 2284 path = expand(sdf->sdf_rfile, path, 2285 &next); 2286 2287 ifl = process_req_lib(sdf, path, 2288 file, ofl, &_rej); 2289 if (ifl == (Ifl_desc *)S_ERROR) { 2290 return (S_ERROR); 2291 } 2292 if (_rej.rej_type) { 2293 if (rej.rej_type == 0) { 2294 rej = _rej; 2295 rej.rej_name = 2296 strdup(_rej.rej_name); 2297 } 2298 } 2299 if (ifl) { 2300 sdf->sdf_file = ifl; 2301 break; 2302 } 2303 } while ((path = strtok_r(NULL, 2304 MSG_ORIG(MSG_STR_COLON), &next)) != NULL); 2305 } 2306 } 2307 if (sdf->sdf_file) 2308 continue; 2309 2310 /* 2311 * Finally try the default library search directories. 2312 */ 2313 for (LIST_TRAVERSE(&ofl->ofl_dlibdirs, lnp2, path)) { 2314 Rej_desc _rej = { 0 }; 2315 2316 ifl = process_req_lib(sdf, path, file, ofl, &rej); 2317 if (ifl == (Ifl_desc *)S_ERROR) { 2318 return (S_ERROR); 2319 } 2320 if (_rej.rej_type) { 2321 if (rej.rej_type == 0) { 2322 rej = _rej; 2323 rej.rej_name = strdup(_rej.rej_name); 2324 } 2325 } 2326 if (ifl) { 2327 sdf->sdf_file = ifl; 2328 break; 2329 } 2330 } 2331 if (sdf->sdf_file) 2332 continue; 2333 2334 /* 2335 * If we've got this far we haven't found the shared object. 2336 * If an object was found, but was rejected for some reason, 2337 * print a diagnostic to that effect, otherwise generate a 2338 * generic "not found" diagnostic. 2339 */ 2340 if (rej.rej_type) { 2341 eprintf(ofl->ofl_lml, ERR_WARNING, 2342 MSG_INTL(reject[rej.rej_type]), 2343 rej.rej_name ? rej.rej_name : 2344 MSG_INTL(MSG_STR_UNKNOWN), conv_reject_desc(&rej)); 2345 } else { 2346 eprintf(ofl->ofl_lml, ERR_WARNING, 2347 MSG_INTL(MSG_FIL_NOTFOUND), file, sdf->sdf_rfile); 2348 } 2349 } 2350 2351 /* 2352 * Finally, now that all objects have been input, make sure any version 2353 * requirements have been met. 2354 */ 2355 return (ld_vers_verify(ofl)); 2356 } 2357