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 /* 33 * Run time linker common setup. 34 * 35 * Called from _setup to get the process going at startup. 36 */ 37 #include "_synonyms.h" 38 39 #include <stdlib.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <sys/types.h> 43 #include <sys/stat.h> 44 #include <sys/mman.h> 45 #include <string.h> 46 #include <stdio.h> 47 #include <unistd.h> 48 #include <dlfcn.h> 49 #include <sys/sysconfig.h> 50 #include <sys/auxv.h> 51 #include <debug.h> 52 #include <conv.h> 53 #include "_rtld.h" 54 #include "_audit.h" 55 #include "_elf.h" 56 #include "_a.out.h" 57 #include "msg.h" 58 59 60 extern int _end, _edata, _etext; 61 extern void _init(void); 62 extern int _brk_unlocked(void *); 63 64 #ifndef SGS_PRE_UNIFIED_PROCESS 65 /* needed for _brk_unlocked() */ 66 void *_nd = &_end; 67 #endif 68 69 /* 70 * Define for the executable's interpreter. 71 * Usually it is ld.so.1, but for the first release of ICL binaries 72 * it is libc.so.1. We keep this information so that we don't end 73 * up mapping libc twice if it is the interpreter. 74 */ 75 static Interp _interp; 76 77 78 static int 79 preload(const char *str, Rt_map *lmp) 80 { 81 Rt_map *clmp = lmp; 82 char *objs, *ptr, *next; 83 Word lmflags = lml_main.lm_flags; 84 uint_t flags; 85 86 DBG_CALL(Dbg_util_nl(&lml_main, DBG_NL_STD)); 87 88 if ((objs = strdup(str)) == 0) 89 return (0); 90 91 /* 92 * Establish the flags for loading each object. If we're called via 93 * lddstub, then the first shared object is the object being inspected 94 * by ldd(1). This object should not be marked as an interposer, as 95 * it is intended to act like the first object of the process. 96 */ 97 if ((lmflags & LML_FLG_TRC_ENABLE) && (FLAGS1(lmp) & FL1_RT_LDDSTUB)) 98 flags = FLG_RT_PRELOAD; 99 else 100 flags = (FLG_RT_PRELOAD | FLG_RT_INTRPOSE); 101 102 ptr = strtok_r(objs, MSG_ORIG(MSG_STR_DELIMIT), &next); 103 do { 104 Pnode *pnp; 105 Rt_map *nlmp = 0; 106 107 DBG_CALL(Dbg_file_preload(&lml_main, ptr)); 108 109 /* 110 * If this a secure application, then preload errors are 111 * reduced to warnings, as the errors are non-fatal. 112 */ 113 if (rtld_flags & RT_FL_SECURE) 114 rtld_flags2 |= RT_FL2_FTL2WARN; 115 if ((pnp = expand_paths(clmp, ptr, PN_SER_EXTLOAD, 0)) != 0) 116 nlmp = load_one(&lml_main, ALO_DATA, pnp, clmp, 117 MODE(lmp), flags, 0); 118 if (pnp) 119 remove_pnode(pnp); 120 if (rtld_flags & RT_FL_SECURE) 121 rtld_flags2 &= ~RT_FL2_FTL2WARN; 122 if (nlmp && (bind_one(clmp, nlmp, BND_NEEDED) == 0)) 123 nlmp = 0; 124 125 /* 126 * Establish state for the next preloadable object. If no 127 * error occurred with loading this object, indicate that this 128 * link-map list contains an interposer. 129 */ 130 flags |= FLG_RT_INTRPOSE; 131 if (nlmp == 0) { 132 if ((lmflags & LML_FLG_TRC_ENABLE) || 133 (rtld_flags & RT_FL_SECURE)) 134 continue; 135 else 136 return (0); 137 } 138 lml_main.lm_flags |= LML_FLG_INTRPOSE; 139 140 /* 141 * If we're tracing shared objects via lddstub, establish a 142 * binding between the initial shared object and lddstub so that 143 * the shared object isn't called out from unused() processing. 144 * After the first object is loaded increment the caller to the 145 * initial preloaded object to provide intuitive ldd -v and -s 146 * diagnostics 147 */ 148 if ((lmflags & LML_FLG_TRC_ENABLE) && 149 (FLAGS1(lmp) & FL1_RT_LDDSTUB)) { 150 if ((lmp == clmp) && (lmflags & 151 (LML_FLG_TRC_UNREF | LML_FLG_TRC_UNUSED))) { 152 if (bind_one(clmp, nlmp, BND_REFER) == 0) 153 continue; 154 } 155 clmp = (Rt_map *)NEXT(lmp); 156 } 157 158 } while ((ptr = strtok_r(NULL, 159 MSG_ORIG(MSG_STR_DELIMIT), &next)) != NULL); 160 161 free(objs); 162 return (1); 163 } 164 165 Rt_map * 166 setup(char **envp, auxv_t *auxv, Word _flags, char *_platform, int _syspagsz, 167 char *_rtldname, Dyn *dyn_ptr, ulong_t ld_base, ulong_t interp_base, int fd, 168 Phdr *phdr, char *execname, char **argv, int dz_fd, uid_t uid, 169 uid_t euid, gid_t gid, gid_t egid, void *aoutdyn, int auxflags, 170 uint_t hwcap_1) 171 { 172 Rt_map *rlmp, *mlmp, **tobj = 0; 173 Ehdr *ehdr; 174 struct stat status; 175 int features = 0, ldsoexec = 0; 176 size_t eaddr, esize; 177 char *str, *argvname; 178 Mmap *mmaps; 179 180 /* 181 * Now that ld.so has relocated itself, initialize our own 'environ' so 182 * as to establish an address suitable for libc's hardware mul/div 183 * magic (libc/sparc/crt/hwmuldiv.o). 184 */ 185 _environ = (char **)((ulong_t)auxv - sizeof (char *)); 186 _init(); 187 _environ = envp; 188 189 /* 190 * Far the most common application execution revolves around appending 191 * the application name to the users PATH definition, thus a full name 192 * is passed to exec() which will in turn be returned via 193 * AT_SUN_EXECNAME. Applications may also be invoked from the current 194 * working directory, or via a relative name. 195 * 196 * Determine whether the kernel has supplied a AT_SUN_EXECNAME aux 197 * vector. This vector points to the full pathname, on the stack, of 198 * the object that started the process. If this is null, then 199 * AT_SUN_EXECNAME isn't supported (if the pathname exceeded the system 200 * limit (PATH_MAX) the exec would have failed). This flag is used to 201 * determine whether we can call resolvepath(). 202 */ 203 if (execname) 204 rtld_flags |= RT_FL_EXECNAME; 205 206 /* 207 * Determine how ld.so.1 has been executed. 208 */ 209 if ((fd == -1) && (phdr == 0)) { 210 /* 211 * If we received neither the AT_EXECFD nor the AT_PHDR aux 212 * vector, ld.so.1 must have been invoked directly from the 213 * command line. 214 */ 215 ldsoexec = 1; 216 217 /* 218 * AT_SUN_EXECNAME provides the most precise name, if it is 219 * available, otherwise fall back to argv[0]. At this time, 220 * there is no process name. 221 */ 222 if (execname) 223 rtldname = execname; 224 else if (argv[0]) 225 rtldname = argv[0]; 226 else 227 rtldname = (char *)MSG_INTL(MSG_STR_UNKNOWN); 228 } else { 229 /* 230 * Otherwise, we have a standard process. AT_SUN_EXECNAME 231 * provides the most precise name, if it is available, 232 * otherwise fall back to argv[0]. Provided the application 233 * is already mapped, the process is the application, so 234 * simplify the application name for use in any diagnostics. 235 */ 236 if (execname) 237 argvname = execname; 238 else if (argv[0]) 239 argvname = execname = argv[0]; 240 else 241 argvname = execname = (char *)MSG_INTL(MSG_STR_UNKNOWN); 242 243 if (fd == -1) { 244 if ((str = strrchr(argvname, '/')) != 0) 245 procname = ++str; 246 else 247 procname = argvname; 248 } 249 250 /* 251 * At this point, we don't know the runtime linkers full path 252 * name. The _rtldname passed to us is the SONAME of the 253 * runtime linker, which is typically /lib/ld.so.1 no matter 254 * what the full path is. Use this for now, we'll reset the 255 * runtime linkers name once the application is analyzed. 256 */ 257 if (_rtldname) { 258 if ((str = strrchr(_rtldname, '/')) != 0) 259 rtldname = ++str; 260 else 261 rtldname = _rtldname; 262 } else 263 rtldname = (char *)MSG_INTL(MSG_STR_UNKNOWN); 264 } 265 266 /* 267 * Initialize any global variables. 268 */ 269 at_flags = _flags; 270 if (dz_fd != FD_UNAVAIL) 271 dz_init(dz_fd); 272 platform = _platform; 273 274 /* 275 * If pagesize is unspecified find its value. 276 */ 277 if ((syspagsz = _syspagsz) == 0) 278 syspagsz = _sysconfig(_CONFIG_PAGESIZE); 279 fmap_setup(); 280 281 /* 282 * Add the unused portion of the last data page to the free space list. 283 * The page size must be set before doing this. Here, _end refers to 284 * the end of the runtime linkers bss. Note that we do not use the 285 * unused data pages from any included .so's to supplement this free 286 * space as badly behaved .os's may corrupt this data space, and in so 287 * doing ruin our data. 288 */ 289 eaddr = S_DROUND((size_t)&_end); 290 esize = eaddr % syspagsz; 291 if (esize) { 292 esize = syspagsz - esize; 293 addfree((void *)eaddr, esize); 294 } 295 296 /* 297 * Establish initial link-map list flags, and link-map list alists. 298 */ 299 if (alist_append(&lml_main.lm_lists, 0, sizeof (Lm_cntl), 300 AL_CNT_LMLISTS) == 0) 301 return (0); 302 lml_main.lm_flags |= LML_FLG_BASELM; 303 lml_main.lm_lmid = LM_ID_BASE; 304 lml_main.lm_lmidstr = (char *)MSG_ORIG(MSG_LMID_BASE); 305 306 if (alist_append(&lml_rtld.lm_lists, 0, sizeof (Lm_cntl), 307 AL_CNT_LMLISTS) == 0) 308 return (0); 309 lml_rtld.lm_flags |= (LML_FLG_RTLDLM | LML_FLG_NOAUDIT | 310 LML_FLG_HOLDLOCK); 311 lml_rtld.lm_lmid = LM_ID_LDSO; 312 lml_rtld.lm_lmidstr = (char *)MSG_ORIG(MSG_LMID_LDSO); 313 314 /* 315 * Determine whether we have a secure executable. 316 */ 317 security(uid, euid, gid, egid, auxflags); 318 319 /* 320 * Initialize a hardware capability descriptor for use in comparing 321 * each loaded object. 322 */ 323 #ifdef AT_SUN_AUXFLAGS 324 if (auxflags & AF_SUN_HWCAPVERIFY) { 325 rtld_flags2 |= RT_FL2_HWCAP; 326 hwcap = (ulong_t)hwcap_1; 327 } 328 #endif 329 /* 330 * Look for environment strings (allows things like LD_NOAUDIT to be 331 * established, although debugging isn't enabled until later). 332 */ 333 if ((readenv_user((const char **)envp, &(lml_main.lm_flags), 334 &(lml_main.lm_tflags), (aoutdyn != 0))) == 1) 335 return (0); 336 337 /* 338 * Create a mapping descriptor for ld.so.1. We can determine our 339 * two segments information from known symbols. 340 */ 341 if ((mmaps = calloc(3, sizeof (Mmap))) == 0) 342 return (0); 343 mmaps[0].m_vaddr = (caddr_t)M_PTRUNC(ld_base); 344 mmaps[0].m_msize = (size_t)((caddr_t)&_etext - mmaps[0].m_vaddr); 345 mmaps[0].m_fsize = mmaps[0].m_msize; 346 mmaps[0].m_perm = (PROT_READ | PROT_EXEC); 347 mmaps[1].m_vaddr = (caddr_t)M_PTRUNC((ulong_t)&r_debug); 348 mmaps[1].m_msize = (size_t)((caddr_t)&_end - mmaps[1].m_vaddr); 349 mmaps[1].m_fsize = (size_t)((caddr_t)&_edata - mmaps[1].m_vaddr); 350 mmaps[1].m_perm = (PROT_READ | PROT_WRITE | PROT_EXEC); 351 352 /* 353 * Create a link map structure for ld.so.1. 354 */ 355 if ((rlmp = elf_new_lm(&lml_rtld, _rtldname, rtldname, dyn_ptr, ld_base, 356 (ulong_t)&_etext, ALO_DATA, (ulong_t)(eaddr - ld_base), 0, ld_base, 357 (ulong_t)(eaddr - ld_base), mmaps, 2)) == 0) { 358 return (0); 359 } 360 361 MODE(rlmp) |= (RTLD_LAZY | RTLD_NODELETE | RTLD_GLOBAL | RTLD_WORLD); 362 FLAGS(rlmp) |= (FLG_RT_ANALYZED | FLG_RT_RELOCED | FLG_RT_INITDONE | 363 FLG_RT_INITCLCT | FLG_RT_FINICLCT | FLG_RT_MODESET); 364 365 /* 366 * Initialize the runtime linkers information. 367 */ 368 interp = &_interp; 369 interp->i_name = NAME(rlmp); 370 interp->i_faddr = (caddr_t)ADDR(rlmp); 371 ldso_plt_init(rlmp); 372 373 /* 374 * If ld.so.1 has been invoked directly, process its arguments. 375 */ 376 if (ldsoexec) { 377 /* 378 * Process any arguments that are specific to ld.so.1, and 379 * reorganize the process stack to effectively remove ld.so.1 380 * from it. Reinitialize the environment pointer, as this may 381 * have been shifted after skipping ld.so.1's arguments. 382 */ 383 if (rtld_getopt(argv, &envp, &auxv, &(lml_main.lm_flags), 384 &(lml_main.lm_tflags), (aoutdyn != 0)) == 1) { 385 eprintf(&lml_main, ERR_NONE, MSG_INTL(MSG_USG_BADOPT)); 386 return (0); 387 } 388 _environ = envp; 389 390 /* 391 * Open the object that ld.so.1 is to execute. 392 */ 393 argvname = execname = argv[0]; 394 395 if ((fd = open(argvname, O_RDONLY)) == -1) { 396 int err = errno; 397 eprintf(&lml_main, ERR_FATAL, MSG_INTL(MSG_SYS_OPEN), 398 argvname, strerror(err)); 399 return (0); 400 } 401 } 402 403 /* 404 * Map in the file, if exec has not already done so. If it has, 405 * simply create a new link map structure for the executable. 406 */ 407 if (fd != -1) { 408 Rej_desc rej; 409 Fct *ftp; 410 411 /* 412 * Find out what type of object we have. 413 */ 414 (void) fstat(fd, &status); 415 if ((ftp = are_u_this(&rej, fd, &status, argvname)) == 0) { 416 eprintf(&lml_main, ERR_FATAL, 417 MSG_INTL(err_reject[rej.rej_type]), argvname, 418 conv_reject_desc(&rej)); 419 return (0); 420 } 421 422 /* 423 * Map in object. 424 */ 425 if ((mlmp = (ftp->fct_map_so)(&lml_main, ALO_DATA, execname, 426 argvname, fd)) == 0) 427 return (0); 428 429 /* 430 * We now have a process name for error diagnostics. 431 */ 432 if ((str = strrchr(argvname, '/')) != 0) 433 procname = ++str; 434 else 435 procname = argvname; 436 437 if (ldsoexec) { 438 Addr brkbase = 0; 439 440 /* 441 * Since ld.so.1 was the primary executed object - the 442 * brk() base has not yet been initialized, we need to 443 * initialize it. For an executable, initialize it to 444 * the end of the object. For a shared object (ET_DYN) 445 * initialize it to the first page in memory. 446 */ 447 ehdr = (Ehdr *)ADDR(mlmp); 448 449 if ((FCT(mlmp) == &elf_fct) && 450 (ehdr->e_type == ET_EXEC)) { 451 int i; 452 Phdr * _phdr = (Phdr *)((uintptr_t)ADDR(mlmp) + 453 ehdr->e_phoff); 454 455 /* 456 * We scan the program headers to find the tail 457 * of the memory image. We can't use MSIZE() 458 * since that's already been page aligned. 459 */ 460 for (i = 0; i < ehdr->e_phnum; i++, _phdr++) { 461 if (_phdr->p_type == PT_LOAD) 462 brkbase = _phdr->p_vaddr + 463 _phdr->p_memsz; 464 } 465 } 466 467 if (!brkbase) 468 brkbase = syspagsz; 469 470 if (_brk_unlocked((void *)brkbase) == -1) { 471 int err = errno; 472 eprintf(&lml_main, ERR_FATAL, 473 MSG_INTL(MSG_SYS_BRK), argvname, 474 strerror(err)); 475 } 476 } 477 478 /* 479 * The object has now been mmaped, we no longer need the file 480 * descriptor. 481 */ 482 (void) close(fd); 483 484 } else { 485 /* 486 * Set up function ptr and arguments according to the type 487 * of file class the executable is. (Currently only supported 488 * types are ELF and a.out format.) Then create a link map 489 * for the executable. 490 */ 491 if (aoutdyn) { 492 #ifdef A_OUT 493 if ((mlmp = aout_new_lm(&lml_main, execname, argvname, 494 aoutdyn, 0, 0, ALO_DATA)) == 0) 495 return (0); 496 497 /* 498 * Set the memory size. Note, we only know the end of 499 * text, and although we could find the _end by looking 500 * up the symbol, this may not be present. We should 501 * set ADDR to MAIN_BASE, but presently all the a.out 502 * relocation code assumes ADDR is 0 for the dynamic 503 * executable. (these data items are only used for 504 * dladdr(3x), and there aren't many a.out dladdr(3x) 505 * users to warrant spending much time on this :-). 506 */ 507 MSIZE(mlmp) = MAIN_BASE + ETEXT(mlmp); 508 509 /* 510 * Disable any object configuration cache (BCP apps 511 * bring in sbcp which can benefit from any object 512 * cache, but both the app and sbcp can't use the same 513 * objects). 514 */ 515 rtld_flags |= RT_FL_NOOBJALT; 516 517 /* 518 * Make sure no-direct bindings are in effect. 519 */ 520 lml_main.lm_tflags |= LML_TFLG_NODIRECT; 521 #else 522 eprintf(&lml_main, ERR_FATAL, 523 MSG_INTL(MSG_ERR_REJ_UNKFILE), argvname); 524 return (0); 525 #endif 526 } else if (phdr) { 527 Phdr *pptr, *firstptr = 0, *lastptr; 528 Phdr *tlsphdr = 0, *unwindphdr = 0; 529 Dyn *dyn = 0; 530 Cap *cap = 0; 531 Off i_offset = 0; 532 Addr base = 0; 533 ulong_t memsize, phsize, entry, etext; 534 uint_t mmapcnt = 0; 535 int i; 536 537 /* 538 * Using the executables phdr address determine the base 539 * address of the input file. NOTE, this assumes the 540 * program headers and elf header are part of the same 541 * mapped segment. Although this has held for many 542 * years now, it might be more flexible if the kernel 543 * gave use the ELF headers start address, rather than 544 * the Program headers. 545 * 546 * Determine from the ELF header if we're been called 547 * from a shared object or dynamic executable. If the 548 * latter, then any addresses within the object are used 549 * as is. Addresses within shared objects must be added 550 * to the process's base address. 551 */ 552 ehdr = (Ehdr *)((Addr)phdr - phdr->p_offset); 553 phsize = ehdr->e_phentsize; 554 if (ehdr->e_type == ET_DYN) 555 base = (Addr)ehdr; 556 557 /* 558 * Allocate a mapping array to retain mapped segment 559 * information. 560 */ 561 if ((mmaps = calloc(ehdr->e_phnum, sizeof (Mmap))) == 0) 562 return (0); 563 564 /* 565 * Extract the needed information from the segment 566 * headers. 567 */ 568 for (i = 0, pptr = phdr; i < ehdr->e_phnum; i++) { 569 if (pptr->p_type == PT_INTERP) { 570 i_offset = pptr->p_offset; 571 interp->i_faddr = 572 (caddr_t)interp_base; 573 } 574 if ((pptr->p_type == PT_LOAD) && 575 (pptr->p_filesz || pptr->p_memsz)) { 576 int perm = (PROT_READ | PROT_EXEC); 577 size_t off; 578 579 if (!firstptr) 580 firstptr = pptr; 581 lastptr = pptr; 582 if (i_offset && pptr->p_filesz && 583 (i_offset >= pptr->p_offset) && 584 (i_offset <= 585 (pptr->p_memsz + pptr->p_offset))) { 586 interp->i_name = (char *) 587 pptr->p_vaddr + i_offset - 588 pptr->p_offset + base; 589 i_offset = 0; 590 } 591 if ((pptr->p_flags & 592 (PF_R | PF_W)) == PF_R) 593 etext = pptr->p_vaddr + 594 pptr->p_memsz + base; 595 else 596 perm |= PROT_WRITE; 597 598 /* 599 * Retain segments mapping info. Round 600 * each segment to a page boundary, as 601 * this insures addresses are suitable 602 * for mprotect() if required. 603 */ 604 off = pptr->p_vaddr + base; 605 mmaps[mmapcnt].m_vaddr = 606 (caddr_t)M_PTRUNC(off); 607 off -= (size_t)mmaps[mmapcnt].m_vaddr; 608 mmaps[mmapcnt].m_msize = 609 pptr->p_memsz + off; 610 mmaps[mmapcnt].m_fsize = 611 pptr->p_filesz + off; 612 mmaps[mmapcnt].m_perm = perm; 613 mmapcnt++; 614 615 } else if (pptr->p_type == PT_DYNAMIC) 616 dyn = (Dyn *)(pptr->p_vaddr + base); 617 else if (pptr->p_type == PT_TLS) 618 tlsphdr = pptr; 619 else if (pptr->p_type == PT_SUNW_UNWIND) 620 unwindphdr = pptr; 621 else if (pptr->p_type == PT_SUNWCAP) 622 cap = (Cap *)(pptr->p_vaddr + base); 623 pptr = (Phdr *)((ulong_t)pptr + phsize); 624 } 625 626 627 memsize = (lastptr->p_vaddr + lastptr->p_memsz) - 628 S_ALIGN(firstptr->p_vaddr, syspagsz); 629 630 entry = ehdr->e_entry; 631 if (ehdr->e_type == ET_DYN) 632 entry += (ulong_t)ehdr; 633 634 if ((mlmp = elf_new_lm(&lml_main, execname, argvname, 635 dyn, (Addr)ehdr, etext, ALO_DATA, memsize, entry, 636 (ulong_t)ehdr, memsize, mmaps, mmapcnt)) == 0) { 637 return (0); 638 } 639 if (tlsphdr) { 640 PTTLS(mlmp) = tlsphdr; 641 tls_assign_soffset(mlmp); 642 } 643 if (unwindphdr) 644 PTUNWIND(mlmp) = unwindphdr; 645 if (cap) 646 cap_assign(cap, mlmp); 647 } 648 } 649 650 /* 651 * Establish the interpretors name as that defined within the initial 652 * object (executable). This provides for ORIGIN processing of ld.so.1 653 * dependencies. 654 */ 655 if (ldsoexec == 0) { 656 size_t len = strlen(interp->i_name); 657 (void) expand(&interp->i_name, &len, 0, 0, 658 (PN_TKN_ISALIST | PN_TKN_HWCAP), rlmp); 659 } 660 PATHNAME(rlmp) = interp->i_name; 661 662 if (FLAGS1(rlmp) & FL1_RT_RELATIVE) 663 (void) fullpath(rlmp, 0); 664 else 665 ORIGNAME(rlmp) = PATHNAME(rlmp) = NAME(rlmp); 666 667 /* 668 * Having established the true runtime linkers name, simplify the name 669 * for error diagnostics. 670 */ 671 if ((str = strrchr(PATHNAME(rlmp), '/')) != 0) 672 rtldname = ++str; 673 else 674 rtldname = PATHNAME(rlmp); 675 676 /* 677 * Expand the fullpath name of the application. This typically occurs 678 * as a part of loading an object, but as the kernel probably mapped 679 * it in, complete this processing now. 680 */ 681 if (FLAGS1(mlmp) & FL1_RT_RELATIVE) 682 (void) fullpath(mlmp, 0); 683 684 /* 685 * Some troublesome programs will change the value of argv[0]. Dupping 686 * the process string protects us, and insures the string is left in 687 * any core files. 688 */ 689 if ((str = (char *)strdup(procname)) == 0) 690 return (0); 691 procname = str; 692 693 /* 694 * If the kernel has provided hardware capabilities information, and 695 * the executable contains hardware capabilities information, make 696 * sure it's a valid object. 697 */ 698 if ((rtld_flags2 & RT_FL2_HWCAP) && HWCAP(mlmp)) { 699 ulong_t mhwcap; 700 701 if ((mhwcap = (HWCAP(mlmp) & ~hwcap)) != 0) { 702 const char *str = conv_cap_val_hw1(mhwcap, M_MACH); 703 704 if (lml_main.lm_flags & LML_FLG_TRC_ENABLE) { 705 (void) printf(MSG_INTL(MSG_LDD_GEN_HWCAP_1), 706 NAME(mlmp), str); 707 } else { 708 eprintf(&lml_main, ERR_FATAL, 709 MSG_INTL(MSG_GEN_BADHWCAP_1), str); 710 return (0); 711 } 712 } 713 } 714 715 FLAGS(mlmp) |= (FLG_RT_ISMAIN | FLG_RT_MODESET); 716 FLAGS1(mlmp) |= FL1_RT_USED; 717 718 /* 719 * It's the responsibility of MAIN(crt0) to call it's _init and _fini 720 * section, therefore null out any INIT/FINI so that this object isn't 721 * collected during tsort processing. And, if the application has no 722 * initarray or finiarray we can economize on establishing bindings. 723 */ 724 INIT(mlmp) = FINI(mlmp) = 0; 725 if ((INITARRAY(mlmp) == 0) && (FINIARRAY(mlmp) == 0)) 726 FLAGS1(mlmp) |= FL1_RT_NOINIFIN; 727 728 /* 729 * Identify lddstub if necessary. 730 */ 731 if (lml_main.lm_flags & LML_FLG_TRC_LDDSTUB) 732 FLAGS1(mlmp) |= FL1_RT_LDDSTUB; 733 734 /* 735 * Retain our argument information for use in dlinfo. 736 */ 737 argsinfo.dla_argv = argv--; 738 argsinfo.dla_argc = (long)*argv; 739 argsinfo.dla_envp = envp; 740 argsinfo.dla_auxv = auxv; 741 742 (void) enter(); 743 744 /* 745 * Add our two main link-maps to the dynlm_list 746 */ 747 if (list_append(&dynlm_list, &lml_main) == 0) 748 return (0); 749 750 if (list_append(&dynlm_list, &lml_rtld) == 0) 751 return (0); 752 753 /* 754 * Reset the link-map counts for both lists. The init count is used to 755 * track how many objects have pending init sections, this gets incre- 756 * mented each time an object is relocated. Since ld.so.1 relocates 757 * itself, it's init count will remain zero. 758 * The object count is used to track how many objects have pending fini 759 * sections, as ld.so.1 handles its own fini we can zero its count. 760 */ 761 lml_main.lm_obj = 1; 762 lml_rtld.lm_obj = 0; 763 764 /* 765 * Initialize debugger information structure. Some parts of this 766 * structure were initialized statically. 767 */ 768 r_debug.rtd_rdebug.r_map = (Link_map *)lml_main.lm_head; 769 r_debug.rtd_rdebug.r_ldsomap = (Link_map *)lml_rtld.lm_head; 770 r_debug.rtd_rdebug.r_ldbase = r_debug.rtd_rdebug.r_ldsomap->l_addr; 771 r_debug.rtd_dynlmlst = &dynlm_list; 772 773 if (platform) 774 platform_sz = strlen(platform); 775 776 /* 777 * Determine the dev/inode information for the executable to complete 778 * load_so() checking for those who might dlopen(a.out). 779 */ 780 if ((FLAGS1(mlmp) & FL1_RT_RELATIVE) && 781 (stat(PATHNAME(mlmp), &status) == 0)) { 782 STDEV(mlmp) = status.st_dev; 783 STINO(mlmp) = status.st_ino; 784 } 785 786 /* 787 * Initialize any configuration information. 788 */ 789 if (!(rtld_flags & RT_FL_NOCFG)) { 790 if ((features = elf_config(mlmp, (aoutdyn != 0))) == -1) 791 return (0); 792 } 793 794 /* 795 * Establish the modes of the initial object. These modes are 796 * propagated to any preloaded objects and explicit shared library 797 * dependencies. Note, RTLD_NOW may have been established during 798 * analysis of the application had it been built -z now. 799 */ 800 MODE(mlmp) |= (RTLD_NODELETE | RTLD_GLOBAL | RTLD_WORLD); 801 if (rtld_flags & RT_FL_CONFGEN) 802 MODE(mlmp) |= RTLD_CONFGEN; 803 if ((MODE(mlmp) & RTLD_NOW) == 0) { 804 if (rtld_flags2 & RT_FL2_BINDNOW) 805 MODE(mlmp) |= RTLD_NOW; 806 else 807 MODE(mlmp) |= RTLD_LAZY; 808 } 809 810 /* 811 * If debugging was requested initialize things now that any cache has 812 * been established. A user can specify LD_DEBUG=help to discover the 813 * list of debugging tokens available without running the application. 814 * However, don't allow this setting from a configuration file. 815 * 816 * Note, to prevent recursion issues caused by loading and binding the 817 * debugging libraries themselves, a local debugging descriptor is 818 * initialized. Once the debugging setup has completed, this local 819 * descriptor is copied to the global descriptor which effectively 820 * enables diagnostic output. 821 */ 822 if (rpl_debug || prm_debug) { 823 Dbg_desc _dbg_desc = {0, 0, 0}; 824 825 if (rpl_debug) { 826 uintptr_t ret; 827 828 if ((ret = dbg_setup(rpl_debug, &_dbg_desc)) == S_ERROR) 829 return (0); 830 if (ret == 0) 831 rtldexit(&lml_main, 0); 832 } 833 if (prm_debug) 834 (void) dbg_setup(prm_debug, &_dbg_desc); 835 836 *dbg_desc = _dbg_desc; 837 } 838 839 /* 840 * Now that debugging is enabled generate any diagnostics from any 841 * previous events. 842 */ 843 if (hwcap) 844 DBG_CALL(Dbg_cap_val_hw1(&lml_main, hwcap, M_MACH)); 845 if (features) 846 DBG_CALL(Dbg_file_config_dis(&lml_main, config->c_name, 847 features)); 848 849 if (DBG_ENABLED) { 850 DBG_CALL(Dbg_file_ldso(rlmp, envp, auxv, 851 LIST(rlmp)->lm_lmidstr, ALO_DATA)); 852 853 if (FCT(mlmp) == &elf_fct) { 854 DBG_CALL(Dbg_file_elf(&lml_main, PATHNAME(mlmp), 855 (ulong_t)DYN(mlmp), ADDR(mlmp), MSIZE(mlmp), 856 ENTRY(mlmp), LIST(mlmp)->lm_lmidstr, ALO_DATA)); 857 } else { 858 DBG_CALL(Dbg_file_aout(&lml_main, PATHNAME(mlmp), 859 (ulong_t)AOUTDYN(mlmp), (ulong_t)ADDR(mlmp), 860 (ulong_t)MSIZE(mlmp), LIST(mlmp)->lm_lmidstr, 861 ALO_DATA)); 862 } 863 } 864 865 /* 866 * Enable auditing. 867 */ 868 if (rpl_audit || prm_audit || profile_lib) { 869 int ndx; 870 const char *aud[3]; 871 872 aud[0] = rpl_audit; 873 aud[1] = prm_audit; 874 aud[2] = profile_lib; 875 876 /* 877 * Any global auditing (set using LD_AUDIT or LD_PROFILE) that 878 * can't be established is non-fatal. 879 */ 880 if ((auditors = calloc(1, sizeof (Audit_desc))) == 0) 881 return (0); 882 883 for (ndx = 0; ndx < 3; ndx++) { 884 if (aud[ndx]) { 885 if ((auditors->ad_name = strdup(aud[ndx])) == 0) 886 return (0); 887 rtld_flags2 |= RT_FL2_FTL2WARN; 888 (void) audit_setup(mlmp, auditors, 889 PN_SER_EXTLOAD); 890 rtld_flags2 &= ~RT_FL2_FTL2WARN; 891 } 892 } 893 lml_main.lm_tflags |= auditors->ad_flags; 894 } 895 if (AUDITORS(mlmp)) { 896 /* 897 * Any object required auditing (set with a DT_DEPAUDIT dynamic 898 * entry) that can't be established is fatal. 899 */ 900 if (audit_setup(mlmp, AUDITORS(mlmp), 0) == 0) 901 return (0); 902 903 FLAGS1(mlmp) |= AUDITORS(mlmp)->ad_flags; 904 lml_main.lm_flags |= LML_FLG_LOCAUDIT; 905 } 906 907 /* 908 * Explicitly add the initial object and ld.so.1 to those objects being 909 * audited. Note, although the ld.so.1 link-map isn't auditable, 910 * establish a cookie for ld.so.1 as this may be bound to via the 911 * dl*() family. 912 */ 913 if ((lml_main.lm_tflags | FLAGS1(mlmp)) & LML_TFLG_AUD_MASK) { 914 if (((audit_objopen(mlmp, mlmp) == 0) || 915 (audit_objopen(mlmp, rlmp) == 0)) && 916 (FLAGS1(mlmp) & LML_TFLG_AUD_MASK)) 917 return (0); 918 } 919 920 /* 921 * Map in any preloadable shared objects. Note, it is valid to preload 922 * a 4.x shared object with a 5.0 executable (or visa-versa), as this 923 * functionality is required by ldd(1). 924 */ 925 if (rpl_preload && (preload(rpl_preload, mlmp) == 0)) 926 return (0); 927 if (prm_preload && (preload(prm_preload, mlmp) == 0)) 928 return (0); 929 930 /* 931 * Load all dependent (needed) objects. 932 */ 933 if (analyze_lmc(&lml_main, ALO_DATA, mlmp) == 0) 934 return (0); 935 936 /* 937 * Relocate all the dependencies we've just added. 938 * 939 * If this process has been established via crle(1), the environment 940 * variable LD_CONFGEN will have been set. crle(1) may create this 941 * process twice. The first time crle only needs to gather dependency 942 * information. The second time, is to dldump() the images. 943 * 944 * If we're only gathering dependencies, relocation is unnecessary. 945 * As crle(1) may be building an arbitrary family of objects, they may 946 * not fully relocate either. Hence the relocation phase is not carried 947 * out now, but will be called by crle(1) once all objects have been 948 * loaded. 949 */ 950 if ((rtld_flags & RT_FL_CONFGEN) == 0) { 951 Word lmflags; 952 953 DBG_CALL(Dbg_util_nl(&lml_main, DBG_NL_STD)); 954 955 if (relocate_lmc(&lml_main, ALO_DATA, mlmp) == 0) 956 return (0); 957 958 /* 959 * Sort the .init sections of all objects we've added. If 960 * we're tracing we only need to execute this under ldd(1) 961 * with the -i or -u options. 962 */ 963 lmflags = lml_main.lm_flags; 964 if (((lmflags & LML_FLG_TRC_ENABLE) == 0) || 965 (lmflags & (LML_FLG_TRC_INIT | LML_FLG_TRC_UNREF))) { 966 if ((tobj = tsort(mlmp, LIST(mlmp)->lm_init, 967 RT_SORT_REV)) == (Rt_map **)S_ERROR) 968 return (0); 969 } 970 971 /* 972 * If we are tracing we're done. This is the one legitimate use 973 * of a direct call to rtldexit() rather than return, as we 974 * don't want to return and jump to the application. 975 */ 976 if (lmflags & LML_FLG_TRC_ENABLE) { 977 unused(&lml_main); 978 rtldexit(&lml_main, 0); 979 } 980 981 /* 982 * Inform the debuggers we're here and stable. Newer debuggers 983 * can indicate their presence by setting the DT_DEBUG entry in 984 * the dynamic executable (see elf_new_lm()). In this case call 985 * getpid() so the debugger can catch the system call. This 986 * handshake allows the debugger to initialize, and consequently 987 * allows the user to set break points in .init code. 988 */ 989 rd_event(&lml_rtld, RD_DLACTIVITY, RT_CONSISTENT); 990 rd_event(&lml_main, RD_DLACTIVITY, RT_CONSISTENT); 991 992 if (rtld_flags & RT_FL_DEBUGGER) { 993 r_debug.rtd_rdebug.r_flags |= RD_FL_ODBG; 994 (void) getpid(); 995 } 996 997 /* 998 * Initialize any initial TLS storage. 999 */ 1000 if (tls_report_modules() == 0) 1001 return (0); 1002 } 1003 1004 /* 1005 * Call any necessary auditing routines, clean up any file descriptors 1006 * and such, and then fire all dependencies .init sections. 1007 */ 1008 rtld_flags |= RT_FL_APPLIC; 1009 1010 rd_event(&lml_main, RD_PREINIT, 0); 1011 1012 if ((lml_main.lm_tflags | FLAGS1(mlmp)) & LML_TFLG_AUD_ACTIVITY) 1013 audit_activity(mlmp, LA_ACT_CONSISTENT); 1014 if ((lml_main.lm_tflags | FLAGS1(mlmp)) & LML_TFLG_AUD_PREINIT) 1015 audit_preinit(mlmp); 1016 1017 call_array(PREINITARRAY(mlmp), (uint_t)PREINITARRAYSZ(mlmp), mlmp, 1018 SHT_PREINIT_ARRAY); 1019 1020 if (tobj) 1021 call_init(tobj, DBG_INIT_SORT); 1022 1023 rd_event(&lml_main, RD_POSTINIT, 0); 1024 1025 unused(&lml_main); 1026 1027 DBG_CALL(Dbg_util_call_main(mlmp)); 1028 1029 leave(LIST(mlmp)); 1030 1031 return (mlmp); 1032 } 1033