1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright (c) 1988 AT&T 24 * All Rights Reserved 25 * 26 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 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_OBJINTPO); 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_OBJINTPO; 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 Word lmflags; 180 181 /* 182 * Now that ld.so has relocated itself, initialize our own 'environ' so 183 * as to establish an address suitable for libc's hardware mul/div 184 * magic (libc/sparc/crt/hwmuldiv.o). 185 */ 186 _environ = (char **)((ulong_t)auxv - sizeof (char *)); 187 _init(); 188 _environ = envp; 189 190 /* 191 * Far the most common application execution revolves around appending 192 * the application name to the users PATH definition, thus a full name 193 * is passed to exec() which will in turn be returned via 194 * AT_SUN_EXECNAME. Applications may also be invoked from the current 195 * working directory, or via a relative name. 196 * 197 * Determine whether the kernel has supplied a AT_SUN_EXECNAME aux 198 * vector. This vector points to the full pathname, on the stack, of 199 * the object that started the process. If this is null, then 200 * AT_SUN_EXECNAME isn't supported (if the pathname exceeded the system 201 * limit (PATH_MAX) the exec would have failed). This flag is used to 202 * determine whether we can call resolvepath(). 203 */ 204 if (execname) 205 rtld_flags |= RT_FL_EXECNAME; 206 207 /* 208 * Determine how ld.so.1 has been executed. 209 */ 210 if ((fd == -1) && (phdr == 0)) { 211 /* 212 * If we received neither the AT_EXECFD nor the AT_PHDR aux 213 * vector, ld.so.1 must have been invoked directly from the 214 * command line. 215 */ 216 ldsoexec = 1; 217 218 /* 219 * AT_SUN_EXECNAME provides the most precise name, if it is 220 * available, otherwise fall back to argv[0]. At this time, 221 * there is no process name. 222 */ 223 if (execname) 224 rtldname = execname; 225 else if (argv[0]) 226 rtldname = argv[0]; 227 else 228 rtldname = (char *)MSG_INTL(MSG_STR_UNKNOWN); 229 } else { 230 /* 231 * Otherwise, we have a standard process. AT_SUN_EXECNAME 232 * provides the most precise name, if it is available, 233 * otherwise fall back to argv[0]. Provided the application 234 * is already mapped, the process is the application, so 235 * simplify the application name for use in any diagnostics. 236 */ 237 if (execname) 238 argvname = execname; 239 else if (argv[0]) 240 argvname = execname = argv[0]; 241 else 242 argvname = execname = (char *)MSG_INTL(MSG_STR_UNKNOWN); 243 244 if (fd == -1) { 245 if ((str = strrchr(argvname, '/')) != 0) 246 procname = ++str; 247 else 248 procname = argvname; 249 } 250 251 /* 252 * At this point, we don't know the runtime linkers full path 253 * name. The _rtldname passed to us is the SONAME of the 254 * runtime linker, which is typically /lib/ld.so.1 no matter 255 * what the full path is. Use this for now, we'll reset the 256 * runtime linkers name once the application is analyzed. 257 */ 258 if (_rtldname) { 259 if ((str = strrchr(_rtldname, '/')) != 0) 260 rtldname = ++str; 261 else 262 rtldname = _rtldname; 263 } else 264 rtldname = (char *)MSG_INTL(MSG_STR_UNKNOWN); 265 } 266 267 /* 268 * Initialize any global variables. 269 */ 270 at_flags = _flags; 271 if (dz_fd != FD_UNAVAIL) 272 dz_init(dz_fd); 273 platform = _platform; 274 275 /* 276 * If pagesize is unspecified find its value. 277 */ 278 if ((syspagsz = _syspagsz) == 0) 279 syspagsz = _sysconfig(_CONFIG_PAGESIZE); 280 fmap_setup(); 281 282 /* 283 * Add the unused portion of the last data page to the free space list. 284 * The page size must be set before doing this. Here, _end refers to 285 * the end of the runtime linkers bss. Note that we do not use the 286 * unused data pages from any included .so's to supplement this free 287 * space as badly behaved .os's may corrupt this data space, and in so 288 * doing ruin our data. 289 */ 290 eaddr = S_DROUND((size_t)&_end); 291 esize = eaddr % syspagsz; 292 if (esize) { 293 esize = syspagsz - esize; 294 addfree((void *)eaddr, esize); 295 } 296 297 /* 298 * Establish initial link-map list flags, and link-map list alists. 299 */ 300 if (alist_append(&lml_main.lm_lists, 0, sizeof (Lm_cntl), 301 AL_CNT_LMLISTS) == 0) 302 return (0); 303 lml_main.lm_flags |= LML_FLG_BASELM; 304 lml_main.lm_lmid = LM_ID_BASE; 305 lml_main.lm_lmidstr = (char *)MSG_ORIG(MSG_LMID_BASE); 306 307 if (alist_append(&lml_rtld.lm_lists, 0, sizeof (Lm_cntl), 308 AL_CNT_LMLISTS) == 0) 309 return (0); 310 lml_rtld.lm_flags |= (LML_FLG_RTLDLM | LML_FLG_NOAUDIT | 311 LML_FLG_HOLDLOCK); 312 lml_rtld.lm_lmid = LM_ID_LDSO; 313 lml_rtld.lm_lmidstr = (char *)MSG_ORIG(MSG_LMID_LDSO); 314 315 /* 316 * Determine whether we have a secure executable. 317 */ 318 security(uid, euid, gid, egid, auxflags); 319 320 /* 321 * Initialize a hardware capability descriptor for use in comparing 322 * each loaded object. 323 */ 324 #ifdef AT_SUN_AUXFLAGS 325 if (auxflags & AF_SUN_HWCAPVERIFY) { 326 rtld_flags2 |= RT_FL2_HWCAP; 327 hwcap = (ulong_t)hwcap_1; 328 } 329 #endif 330 /* 331 * Look for environment strings (allows things like LD_NOAUDIT to be 332 * established, although debugging isn't enabled until later). 333 */ 334 if ((readenv_user((const char **)envp, &(lml_main.lm_flags), 335 &(lml_main.lm_tflags), (aoutdyn != 0))) == 1) 336 return (0); 337 338 /* 339 * Create a mapping descriptor for ld.so.1. We can determine our 340 * two segments information from known symbols. 341 */ 342 if ((mmaps = calloc(3, sizeof (Mmap))) == 0) 343 return (0); 344 mmaps[0].m_vaddr = (caddr_t)M_PTRUNC(ld_base); 345 mmaps[0].m_msize = (size_t)((caddr_t)&_etext - mmaps[0].m_vaddr); 346 mmaps[0].m_fsize = mmaps[0].m_msize; 347 mmaps[0].m_perm = (PROT_READ | PROT_EXEC); 348 mmaps[1].m_vaddr = (caddr_t)M_PTRUNC((ulong_t)&r_debug); 349 mmaps[1].m_msize = (size_t)((caddr_t)&_end - mmaps[1].m_vaddr); 350 mmaps[1].m_fsize = (size_t)((caddr_t)&_edata - mmaps[1].m_vaddr); 351 mmaps[1].m_perm = (PROT_READ | PROT_WRITE | PROT_EXEC); 352 353 /* 354 * Create a link map structure for ld.so.1. 355 */ 356 if ((rlmp = elf_new_lm(&lml_rtld, _rtldname, rtldname, dyn_ptr, ld_base, 357 (ulong_t)&_etext, ALO_DATA, (ulong_t)(eaddr - ld_base), 0, ld_base, 358 (ulong_t)(eaddr - ld_base), mmaps, 2)) == 0) { 359 return (0); 360 } 361 362 MODE(rlmp) |= (RTLD_LAZY | RTLD_NODELETE | RTLD_GLOBAL | RTLD_WORLD); 363 FLAGS(rlmp) |= (FLG_RT_ANALYZED | FLG_RT_RELOCED | FLG_RT_INITDONE | 364 FLG_RT_INITCLCT | FLG_RT_FINICLCT | FLG_RT_MODESET); 365 366 /* 367 * Initialize the runtime linkers information. 368 */ 369 interp = &_interp; 370 interp->i_name = NAME(rlmp); 371 interp->i_faddr = (caddr_t)ADDR(rlmp); 372 ldso_plt_init(rlmp); 373 374 /* 375 * If ld.so.1 has been invoked directly, process its arguments. 376 */ 377 if (ldsoexec) { 378 /* 379 * Process any arguments that are specific to ld.so.1, and 380 * reorganize the process stack to effectively remove ld.so.1 381 * from it. Reinitialize the environment pointer, as this may 382 * have been shifted after skipping ld.so.1's arguments. 383 */ 384 if (rtld_getopt(argv, &envp, &auxv, &(lml_main.lm_flags), 385 &(lml_main.lm_tflags), (aoutdyn != 0)) == 1) { 386 eprintf(&lml_main, ERR_NONE, MSG_INTL(MSG_USG_BADOPT)); 387 return (0); 388 } 389 _environ = envp; 390 391 /* 392 * Open the object that ld.so.1 is to execute. 393 */ 394 argvname = execname = argv[0]; 395 396 if ((fd = open(argvname, O_RDONLY)) == -1) { 397 int err = errno; 398 eprintf(&lml_main, ERR_FATAL, MSG_INTL(MSG_SYS_OPEN), 399 argvname, strerror(err)); 400 return (0); 401 } 402 } 403 404 /* 405 * Map in the file, if exec has not already done so. If it has, 406 * simply create a new link map structure for the executable. 407 */ 408 if (fd != -1) { 409 Rej_desc rej; 410 Fct *ftp; 411 412 /* 413 * Find out what type of object we have. 414 */ 415 (void) fstat(fd, &status); 416 if ((ftp = are_u_this(&rej, fd, &status, argvname)) == 0) { 417 eprintf(&lml_main, ERR_FATAL, 418 MSG_INTL(err_reject[rej.rej_type]), argvname, 419 conv_reject_desc(&rej)); 420 return (0); 421 } 422 423 /* 424 * Map in object. 425 */ 426 if ((mlmp = (ftp->fct_map_so)(&lml_main, ALO_DATA, execname, 427 argvname, fd)) == 0) 428 return (0); 429 430 /* 431 * We now have a process name for error diagnostics. 432 */ 433 if ((str = strrchr(argvname, '/')) != 0) 434 procname = ++str; 435 else 436 procname = argvname; 437 438 if (ldsoexec) { 439 Addr brkbase = 0; 440 441 /* 442 * Since ld.so.1 was the primary executed object - the 443 * brk() base has not yet been initialized, we need to 444 * initialize it. For an executable, initialize it to 445 * the end of the object. For a shared object (ET_DYN) 446 * initialize it to the first page in memory. 447 */ 448 ehdr = (Ehdr *)ADDR(mlmp); 449 450 if ((FCT(mlmp) == &elf_fct) && 451 (ehdr->e_type == ET_EXEC)) { 452 int i; 453 Phdr * _phdr = (Phdr *)((uintptr_t)ADDR(mlmp) + 454 ehdr->e_phoff); 455 456 /* 457 * We scan the program headers to find the tail 458 * of the memory image. We can't use MSIZE() 459 * since that's already been page aligned. 460 */ 461 for (i = 0; i < ehdr->e_phnum; i++, _phdr++) { 462 if (_phdr->p_type == PT_LOAD) 463 brkbase = _phdr->p_vaddr + 464 _phdr->p_memsz; 465 } 466 } 467 468 if (!brkbase) 469 brkbase = syspagsz; 470 471 if (_brk_unlocked((void *)brkbase) == -1) { 472 int err = errno; 473 eprintf(&lml_main, ERR_FATAL, 474 MSG_INTL(MSG_SYS_BRK), argvname, 475 strerror(err)); 476 } 477 } 478 479 /* 480 * The object has now been mmaped, we no longer need the file 481 * descriptor. 482 */ 483 (void) close(fd); 484 485 } else { 486 /* 487 * Set up function ptr and arguments according to the type 488 * of file class the executable is. (Currently only supported 489 * types are ELF and a.out format.) Then create a link map 490 * for the executable. 491 */ 492 if (aoutdyn) { 493 #ifdef A_OUT 494 if ((mlmp = aout_new_lm(&lml_main, execname, argvname, 495 aoutdyn, 0, 0, ALO_DATA)) == 0) 496 return (0); 497 498 /* 499 * Set the memory size. Note, we only know the end of 500 * text, and although we could find the _end by looking 501 * up the symbol, this may not be present. We should 502 * set ADDR to MAIN_BASE, but presently all the a.out 503 * relocation code assumes ADDR is 0 for the dynamic 504 * executable. (these data items are only used for 505 * dladdr(3x), and there aren't many a.out dladdr(3x) 506 * users to warrant spending much time on this :-). 507 */ 508 MSIZE(mlmp) = MAIN_BASE + ETEXT(mlmp); 509 510 /* 511 * Disable any object configuration cache (BCP apps 512 * bring in sbcp which can benefit from any object 513 * cache, but both the app and sbcp can't use the same 514 * objects). 515 */ 516 rtld_flags |= RT_FL_NOOBJALT; 517 518 /* 519 * Make sure no-direct bindings are in effect. 520 */ 521 lml_main.lm_tflags |= LML_TFLG_NODIRECT; 522 #else 523 eprintf(&lml_main, ERR_FATAL, 524 MSG_INTL(MSG_ERR_REJ_UNKFILE), argvname); 525 return (0); 526 #endif 527 } else if (phdr) { 528 Phdr *pptr, *firstptr = 0, *lastptr; 529 Phdr *tlsphdr = 0, *unwindphdr = 0; 530 Dyn *dyn = 0; 531 Cap *cap = 0; 532 Off i_offset = 0; 533 Addr base = 0; 534 ulong_t memsize, phsize, entry, etext; 535 uint_t mmapcnt = 0; 536 int i; 537 538 /* 539 * Using the executables phdr address determine the base 540 * address of the input file. NOTE, this assumes the 541 * program headers and elf header are part of the same 542 * mapped segment. Although this has held for many 543 * years now, it might be more flexible if the kernel 544 * gave use the ELF headers start address, rather than 545 * the Program headers. 546 * 547 * Determine from the ELF header if we're been called 548 * from a shared object or dynamic executable. If the 549 * latter, then any addresses within the object are used 550 * as is. Addresses within shared objects must be added 551 * to the process's base address. 552 */ 553 ehdr = (Ehdr *)((Addr)phdr - phdr->p_offset); 554 phsize = ehdr->e_phentsize; 555 if (ehdr->e_type == ET_DYN) 556 base = (Addr)ehdr; 557 558 /* 559 * Allocate a mapping array to retain mapped segment 560 * information. 561 */ 562 if ((mmaps = calloc(ehdr->e_phnum, sizeof (Mmap))) == 0) 563 return (0); 564 565 /* 566 * Extract the needed information from the segment 567 * headers. 568 */ 569 for (i = 0, pptr = phdr; i < ehdr->e_phnum; i++) { 570 if (pptr->p_type == PT_INTERP) { 571 i_offset = pptr->p_offset; 572 interp->i_faddr = 573 (caddr_t)interp_base; 574 } 575 if ((pptr->p_type == PT_LOAD) && 576 (pptr->p_filesz || pptr->p_memsz)) { 577 int perm = (PROT_READ | PROT_EXEC); 578 size_t off; 579 580 if (!firstptr) 581 firstptr = pptr; 582 lastptr = pptr; 583 if (i_offset && pptr->p_filesz && 584 (i_offset >= pptr->p_offset) && 585 (i_offset <= 586 (pptr->p_memsz + pptr->p_offset))) { 587 interp->i_name = (char *) 588 pptr->p_vaddr + i_offset - 589 pptr->p_offset + base; 590 i_offset = 0; 591 } 592 if ((pptr->p_flags & 593 (PF_R | PF_W)) == PF_R) 594 etext = pptr->p_vaddr + 595 pptr->p_memsz + base; 596 else 597 perm |= PROT_WRITE; 598 599 /* 600 * Retain segments mapping info. Round 601 * each segment to a page boundary, as 602 * this insures addresses are suitable 603 * for mprotect() if required. 604 */ 605 off = pptr->p_vaddr + base; 606 mmaps[mmapcnt].m_vaddr = 607 (caddr_t)M_PTRUNC(off); 608 off -= (size_t)mmaps[mmapcnt].m_vaddr; 609 mmaps[mmapcnt].m_msize = 610 pptr->p_memsz + off; 611 mmaps[mmapcnt].m_fsize = 612 pptr->p_filesz + off; 613 mmaps[mmapcnt].m_perm = perm; 614 mmapcnt++; 615 616 } else if (pptr->p_type == PT_DYNAMIC) { 617 dyn = (Dyn *)(pptr->p_vaddr + base); 618 } else if ((pptr->p_type == PT_TLS) && 619 pptr->p_memsz) { 620 tlsphdr = pptr; 621 } else if (pptr->p_type == PT_SUNW_UNWIND) { 622 unwindphdr = pptr; 623 } else if (pptr->p_type == PT_SUNWCAP) { 624 cap = (Cap *)(pptr->p_vaddr + base); 625 } 626 pptr = (Phdr *)((ulong_t)pptr + phsize); 627 } 628 629 630 memsize = (lastptr->p_vaddr + lastptr->p_memsz) - 631 S_ALIGN(firstptr->p_vaddr, syspagsz); 632 633 entry = ehdr->e_entry; 634 if (ehdr->e_type == ET_DYN) 635 entry += (ulong_t)ehdr; 636 637 if ((mlmp = elf_new_lm(&lml_main, execname, argvname, 638 dyn, (Addr)ehdr, etext, ALO_DATA, memsize, entry, 639 (ulong_t)ehdr, memsize, mmaps, mmapcnt)) == 0) { 640 return (0); 641 } 642 if (tlsphdr && 643 (tls_assign(&lml_main, mlmp, tlsphdr) == 0)) 644 return (0); 645 646 if (unwindphdr) 647 PTUNWIND(mlmp) = unwindphdr; 648 649 if (cap) 650 cap_assign(cap, mlmp); 651 } 652 } 653 654 /* 655 * Establish the interpretors name as that defined within the initial 656 * object (executable). This provides for ORIGIN processing of ld.so.1 657 * dependencies. 658 */ 659 if (ldsoexec == 0) { 660 size_t len = strlen(interp->i_name); 661 (void) expand(&interp->i_name, &len, 0, 0, 662 (PN_TKN_ISALIST | PN_TKN_HWCAP), rlmp); 663 } 664 PATHNAME(rlmp) = interp->i_name; 665 666 if (FLAGS1(rlmp) & FL1_RT_RELATIVE) 667 (void) fullpath(rlmp, 0); 668 else 669 ORIGNAME(rlmp) = PATHNAME(rlmp) = NAME(rlmp); 670 671 /* 672 * Having established the true runtime linkers name, simplify the name 673 * for error diagnostics. 674 */ 675 if ((str = strrchr(PATHNAME(rlmp), '/')) != 0) 676 rtldname = ++str; 677 else 678 rtldname = PATHNAME(rlmp); 679 680 /* 681 * Expand the fullpath name of the application. This typically occurs 682 * as a part of loading an object, but as the kernel probably mapped 683 * it in, complete this processing now. 684 */ 685 if (FLAGS1(mlmp) & FL1_RT_RELATIVE) 686 (void) fullpath(mlmp, 0); 687 688 /* 689 * Some troublesome programs will change the value of argv[0]. Dupping 690 * the process string protects us, and insures the string is left in 691 * any core files. 692 */ 693 if ((str = (char *)strdup(procname)) == 0) 694 return (0); 695 procname = str; 696 697 /* 698 * If the kernel has provided hardware capabilities information, and 699 * the executable contains hardware capabilities information, make 700 * sure it's a valid object. 701 */ 702 if ((rtld_flags2 & RT_FL2_HWCAP) && HWCAP(mlmp)) { 703 ulong_t mhwcap; 704 705 if ((mhwcap = (HWCAP(mlmp) & ~hwcap)) != 0) { 706 const char *str = conv_cap_val_hw1(mhwcap, M_MACH); 707 708 if (lml_main.lm_flags & LML_FLG_TRC_ENABLE) { 709 (void) printf(MSG_INTL(MSG_LDD_GEN_HWCAP_1), 710 NAME(mlmp), str); 711 } else { 712 eprintf(&lml_main, ERR_FATAL, 713 MSG_INTL(MSG_GEN_BADHWCAP_1), str); 714 return (0); 715 } 716 } 717 } 718 719 FLAGS(mlmp) |= (FLG_RT_ISMAIN | FLG_RT_MODESET); 720 FLAGS1(mlmp) |= FL1_RT_USED; 721 722 /* 723 * It's the responsibility of MAIN(crt0) to call it's _init and _fini 724 * section, therefore null out any INIT/FINI so that this object isn't 725 * collected during tsort processing. And, if the application has no 726 * initarray or finiarray we can economize on establishing bindings. 727 */ 728 INIT(mlmp) = FINI(mlmp) = 0; 729 if ((INITARRAY(mlmp) == 0) && (FINIARRAY(mlmp) == 0)) 730 FLAGS1(mlmp) |= FL1_RT_NOINIFIN; 731 732 /* 733 * Identify lddstub if necessary. 734 */ 735 if (lml_main.lm_flags & LML_FLG_TRC_LDDSTUB) 736 FLAGS1(mlmp) |= FL1_RT_LDDSTUB; 737 738 /* 739 * Retain our argument information for use in dlinfo. 740 */ 741 argsinfo.dla_argv = argv--; 742 argsinfo.dla_argc = (long)*argv; 743 argsinfo.dla_envp = envp; 744 argsinfo.dla_auxv = auxv; 745 746 (void) enter(); 747 748 /* 749 * Add our two main link-maps to the dynlm_list 750 */ 751 if (list_append(&dynlm_list, &lml_main) == 0) 752 return (0); 753 754 if (list_append(&dynlm_list, &lml_rtld) == 0) 755 return (0); 756 757 /* 758 * Reset the link-map counts for both lists. The init count is used to 759 * track how many objects have pending init sections, this gets incre- 760 * mented each time an object is relocated. Since ld.so.1 relocates 761 * itself, it's init count will remain zero. 762 * The object count is used to track how many objects have pending fini 763 * sections, as ld.so.1 handles its own fini we can zero its count. 764 */ 765 lml_main.lm_obj = 1; 766 lml_rtld.lm_obj = 0; 767 768 /* 769 * Initialize debugger information structure. Some parts of this 770 * structure were initialized statically. 771 */ 772 r_debug.rtd_rdebug.r_map = (Link_map *)lml_main.lm_head; 773 r_debug.rtd_rdebug.r_ldsomap = (Link_map *)lml_rtld.lm_head; 774 r_debug.rtd_rdebug.r_ldbase = r_debug.rtd_rdebug.r_ldsomap->l_addr; 775 r_debug.rtd_dynlmlst = &dynlm_list; 776 777 if (platform) 778 platform_sz = strlen(platform); 779 780 /* 781 * Determine the dev/inode information for the executable to complete 782 * load_so() checking for those who might dlopen(a.out). 783 */ 784 if ((FLAGS1(mlmp) & FL1_RT_RELATIVE) && 785 (stat(PATHNAME(mlmp), &status) == 0)) { 786 STDEV(mlmp) = status.st_dev; 787 STINO(mlmp) = status.st_ino; 788 } 789 790 /* 791 * Initialize any configuration information. 792 */ 793 if (!(rtld_flags & RT_FL_NOCFG)) { 794 if ((features = elf_config(mlmp, (aoutdyn != 0))) == -1) 795 return (0); 796 } 797 798 /* 799 * Establish the modes of the initial object. These modes are 800 * propagated to any preloaded objects and explicit shared library 801 * dependencies. Note, RTLD_NOW may have been established during 802 * analysis of the application had it been built -z now. 803 */ 804 MODE(mlmp) |= (RTLD_NODELETE | RTLD_GLOBAL | RTLD_WORLD); 805 if (rtld_flags & RT_FL_CONFGEN) 806 MODE(mlmp) |= RTLD_CONFGEN; 807 if ((MODE(mlmp) & RTLD_NOW) == 0) { 808 if (rtld_flags2 & RT_FL2_BINDNOW) 809 MODE(mlmp) |= RTLD_NOW; 810 else 811 MODE(mlmp) |= RTLD_LAZY; 812 } 813 814 /* 815 * If debugging was requested initialize things now that any cache has 816 * been established. A user can specify LD_DEBUG=help to discover the 817 * list of debugging tokens available without running the application. 818 * However, don't allow this setting from a configuration file. 819 * 820 * Note, to prevent recursion issues caused by loading and binding the 821 * debugging libraries themselves, a local debugging descriptor is 822 * initialized. Once the debugging setup has completed, this local 823 * descriptor is copied to the global descriptor which effectively 824 * enables diagnostic output. 825 */ 826 if (rpl_debug || prm_debug) { 827 Dbg_desc _dbg_desc = {0, 0, 0}; 828 829 if (rpl_debug) { 830 uintptr_t ret; 831 832 if ((ret = dbg_setup(rpl_debug, &_dbg_desc)) == S_ERROR) 833 return (0); 834 if (ret == 0) 835 rtldexit(&lml_main, 0); 836 } 837 if (prm_debug) 838 (void) dbg_setup(prm_debug, &_dbg_desc); 839 840 *dbg_desc = _dbg_desc; 841 } 842 843 /* 844 * Now that debugging is enabled generate any diagnostics from any 845 * previous events. 846 */ 847 if (hwcap) 848 DBG_CALL(Dbg_cap_val_hw1(&lml_main, hwcap, M_MACH)); 849 if (features) 850 DBG_CALL(Dbg_file_config_dis(&lml_main, config->c_name, 851 features)); 852 853 if (DBG_ENABLED) { 854 DBG_CALL(Dbg_file_ldso(rlmp, envp, auxv, 855 LIST(rlmp)->lm_lmidstr, ALO_DATA)); 856 857 if (FCT(mlmp) == &elf_fct) { 858 DBG_CALL(Dbg_file_elf(&lml_main, PATHNAME(mlmp), 859 (ulong_t)DYN(mlmp), ADDR(mlmp), MSIZE(mlmp), 860 ENTRY(mlmp), LIST(mlmp)->lm_lmidstr, ALO_DATA)); 861 } else { 862 DBG_CALL(Dbg_file_aout(&lml_main, PATHNAME(mlmp), 863 (ulong_t)AOUTDYN(mlmp), (ulong_t)ADDR(mlmp), 864 (ulong_t)MSIZE(mlmp), LIST(mlmp)->lm_lmidstr, 865 ALO_DATA)); 866 } 867 } 868 869 /* 870 * Enable auditing. 871 */ 872 if (rpl_audit || prm_audit || profile_lib) { 873 int ndx; 874 const char *aud[3]; 875 876 aud[0] = rpl_audit; 877 aud[1] = prm_audit; 878 aud[2] = profile_lib; 879 880 /* 881 * Any global auditing (set using LD_AUDIT or LD_PROFILE) that 882 * can't be established is non-fatal. 883 */ 884 if ((auditors = calloc(1, sizeof (Audit_desc))) == 0) 885 return (0); 886 887 for (ndx = 0; ndx < 3; ndx++) { 888 if (aud[ndx]) { 889 if ((auditors->ad_name = strdup(aud[ndx])) == 0) 890 return (0); 891 rtld_flags2 |= RT_FL2_FTL2WARN; 892 (void) audit_setup(mlmp, auditors, 893 PN_SER_EXTLOAD); 894 rtld_flags2 &= ~RT_FL2_FTL2WARN; 895 } 896 } 897 lml_main.lm_tflags |= auditors->ad_flags; 898 } 899 if (AUDITORS(mlmp)) { 900 /* 901 * Any object required auditing (set with a DT_DEPAUDIT dynamic 902 * entry) that can't be established is fatal. 903 */ 904 if (FLAGS1(mlmp) & FL1_RT_GLOBAUD) { 905 /* 906 * If this object requires global auditing, use the 907 * local auditing information to set the global 908 * auditing descriptor. The effect is that a 909 * DT_DEPAUDIT act as an LD_AUDIT. 910 */ 911 if ((auditors == 0) && 912 ((auditors = calloc(1, sizeof (Audit_desc))) == 0)) 913 return (0); 914 915 auditors->ad_name = AUDITORS(mlmp)->ad_name; 916 if (audit_setup(mlmp, auditors, 0) == 0) 917 return (0); 918 lml_main.lm_tflags |= auditors->ad_flags; 919 920 /* 921 * Clear the local auditor information. 922 */ 923 free((void *) AUDITORS(mlmp)); 924 AUDITORS(mlmp) = 0; 925 926 } else { 927 /* 928 * Establish any local auditing. 929 */ 930 if (audit_setup(mlmp, AUDITORS(mlmp), 0) == 0) 931 return (0); 932 933 FLAGS1(mlmp) |= AUDITORS(mlmp)->ad_flags; 934 lml_main.lm_flags |= LML_FLG_LOCAUDIT; 935 } 936 } 937 938 /* 939 * Explicitly add the initial object and ld.so.1 to those objects being 940 * audited. Note, although the ld.so.1 link-map isn't auditable, 941 * establish a cookie for ld.so.1 as this may be bound to via the 942 * dl*() family. 943 */ 944 if ((lml_main.lm_tflags | FLAGS1(mlmp)) & LML_TFLG_AUD_MASK) { 945 if (((audit_objopen(mlmp, mlmp) == 0) || 946 (audit_objopen(mlmp, rlmp) == 0)) && 947 (FLAGS1(mlmp) & LML_TFLG_AUD_MASK)) 948 return (0); 949 } 950 951 /* 952 * Map in any preloadable shared objects. Note, it is valid to preload 953 * a 4.x shared object with a 5.0 executable (or visa-versa), as this 954 * functionality is required by ldd(1). 955 */ 956 if (rpl_preload && (preload(rpl_preload, mlmp) == 0)) 957 return (0); 958 if (prm_preload && (preload(prm_preload, mlmp) == 0)) 959 return (0); 960 961 /* 962 * Load all dependent (needed) objects. 963 */ 964 if (analyze_lmc(&lml_main, ALO_DATA, mlmp) == 0) 965 return (0); 966 967 /* 968 * Relocate all the dependencies we've just added. 969 * 970 * If this process has been established via crle(1), the environment 971 * variable LD_CONFGEN will have been set. crle(1) may create this 972 * process twice. The first time crle only needs to gather dependency 973 * information. The second time, is to dldump() the images. 974 * 975 * If we're only gathering dependencies, relocation is unnecessary. 976 * As crle(1) may be building an arbitrary family of objects, they may 977 * not fully relocate either. Hence the relocation phase is not carried 978 * out now, but will be called by crle(1) once all objects have been 979 * loaded. 980 */ 981 if ((rtld_flags & RT_FL_CONFGEN) == 0) { 982 983 DBG_CALL(Dbg_util_nl(&lml_main, DBG_NL_STD)); 984 985 if (relocate_lmc(&lml_main, ALO_DATA, mlmp, mlmp) == 0) 986 return (0); 987 988 /* 989 * Inform the debuggers we're here and stable. Newer debuggers 990 * can indicate their presence by setting the DT_DEBUG entry in 991 * the dynamic executable (see elf_new_lm()). In this case call 992 * getpid() so the debugger can catch the system call. This 993 * handshake allows the debugger to initialize, and consequently 994 * allows the user to set break points in .init code. 995 */ 996 rd_event(&lml_main, RD_DLACTIVITY, RT_CONSISTENT); 997 rd_event(&lml_rtld, RD_DLACTIVITY, RT_CONSISTENT); 998 999 if (rtld_flags & RT_FL_DEBUGGER) { 1000 r_debug.rtd_rdebug.r_flags |= RD_FL_ODBG; 1001 (void) getpid(); 1002 } 1003 } 1004 1005 /* 1006 * Indicate preinit activity, and call any auditing routines. These 1007 * routines are called before initializing any threads via libc, or 1008 * before collecting the complete set of .inits on the primary link-map. 1009 * Although most libc interfaces are encapsulated in local routines 1010 * within libc, they have been known to escape (ie. call a .plt). As 1011 * the appcert auditor uses preinit as a trigger to establish some 1012 * external interfaces to the main link-maps libc, we need to activate 1013 * this trigger before exercising any code within libc. Additionally, 1014 * I wouldn't put it past an auditor to add additional objects to the 1015 * primary link-map. Hence, we collect .inits after the audit call. 1016 */ 1017 rd_event(&lml_main, RD_PREINIT, 0); 1018 1019 if ((lml_main.lm_tflags | FLAGS1(mlmp)) & LML_TFLG_AUD_ACTIVITY) 1020 audit_activity(mlmp, LA_ACT_CONSISTENT); 1021 if ((lml_main.lm_tflags | FLAGS1(mlmp)) & LML_TFLG_AUD_PREINIT) 1022 audit_preinit(mlmp); 1023 1024 /* 1025 * If we're creating initial configuration information, we're done 1026 * now that the auditing step has been called. 1027 */ 1028 if (rtld_flags & RT_FL_CONFGEN) { 1029 leave(LIST(mlmp)); 1030 return (mlmp); 1031 } 1032 1033 /* 1034 * Sort the .init sections of all objects we've added. If we're 1035 * tracing we only need to execute this under ldd(1) with the -i or -u 1036 * options. 1037 */ 1038 lmflags = lml_main.lm_flags; 1039 if (((lmflags & LML_FLG_TRC_ENABLE) == 0) || 1040 (lmflags & (LML_FLG_TRC_INIT | LML_FLG_TRC_UNREF))) { 1041 if ((tobj = tsort(mlmp, LIST(mlmp)->lm_init, 1042 RT_SORT_REV)) == (Rt_map **)S_ERROR) 1043 return (0); 1044 } 1045 1046 /* 1047 * If we are tracing we're done. This is the one legitimate use of a 1048 * direct call to rtldexit() rather than return, as we don't want to 1049 * return and jump to the application. 1050 */ 1051 if (lmflags & LML_FLG_TRC_ENABLE) { 1052 unused(&lml_main); 1053 rtldexit(&lml_main, 0); 1054 } 1055 1056 /* 1057 * Establish any static TLS for this primary link-map. Note, regardless 1058 * of whether TLS is available, an initial handshake occurs with libc to 1059 * indicate we're processing the primary link-map. Having identified 1060 * the primary link-map, initialize threads. 1061 */ 1062 if (rt_get_extern(&lml_main, mlmp) == 0) 1063 return (0); 1064 if (tls_statmod(&lml_main, mlmp) == 0) 1065 return (0); 1066 1067 rt_thr_init(&lml_main); 1068 1069 rtld_flags2 |= RT_FL2_PLMSETUP; 1070 rtld_flags |= RT_FL_APPLIC; 1071 1072 /* 1073 * Fire all dependencies .init sections. Identify any unused 1074 * dependencies, and leave the runtime linker - effectively calling 1075 * the dynamic executables entry point. 1076 */ 1077 call_array(PREINITARRAY(mlmp), (uint_t)PREINITARRAYSZ(mlmp), mlmp, 1078 SHT_PREINIT_ARRAY); 1079 1080 if (tobj) 1081 call_init(tobj, DBG_INIT_SORT); 1082 1083 rd_event(&lml_main, RD_POSTINIT, 0); 1084 1085 unused(&lml_main); 1086 1087 DBG_CALL(Dbg_util_call_main(mlmp)); 1088 1089 leave(LIST(mlmp)); 1090 1091 return (mlmp); 1092 } 1093