ldso/ldso/dl-elf.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * This file contains the helper routines to load an ELF shared
   4  * library into memory and add the symbol table info to the chain.
   5  *
   6  * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
   7  * Copyright (c) 1994-2000 Eric Youngdale, Peter MacDonald,
   8  *                              David Engel, Hongjiu Lu and Mitch D'Souza
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. The name of the above contributors may not be
  16  *    used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32
  33 #include "ldso.h"
  34
  35 #ifdef __LDSO_CACHE_SUPPORT__
  36
  37 static caddr_t _dl_cache_addr = NULL;
  38 static size_t _dl_cache_size = 0;
  39
  40 int _dl_map_cache(void)
  41 {
  42         int fd;
  43         struct stat st;
  44         header_t *header;
  45         libentry_t *libent;
  46         int i, strtabsize;
  47
  48         if (_dl_cache_addr == (caddr_t) - 1)
  49                 return -1;
  50         else if (_dl_cache_addr != NULL)
  51                 return 0;
  52
  53         if (_dl_stat(LDSO_CACHE, &st)
  54             || (fd = _dl_open(LDSO_CACHE, O_RDONLY, 0)) < 0) {
  55                 _dl_cache_addr = (caddr_t) - 1; /* so we won't try again */
  56                 return -1;
  57         }
  58
  59         _dl_cache_size = st.st_size;
  60         _dl_cache_addr = (caddr_t) _dl_mmap(0, _dl_cache_size, PROT_READ, MAP_SHARED, fd, 0);
  61         _dl_close(fd);
  62         if (_dl_mmap_check_error(_dl_cache_addr)) {
  63                 _dl_dprintf(2, "%s: can't map cache '%s'\n",
  64                                 _dl_progname, LDSO_CACHE);
  65                 return -1;
  66         }
  67
  68         header = (header_t *) _dl_cache_addr;
  69
  70         if (_dl_cache_size < sizeof(header_t) ||
  71                         _dl_memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)
  72                         || _dl_memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)
  73                         || _dl_cache_size <
  74                         (sizeof(header_t) + header->nlibs * sizeof(libentry_t))
  75                         || _dl_cache_addr[_dl_cache_size - 1] != '\0')
  76         {
  77                 _dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname,
  78                                 LDSO_CACHE);
  79                 goto fail;
  80         }
  81
  82         strtabsize = _dl_cache_size - sizeof(header_t) -
  83                 header->nlibs * sizeof(libentry_t);
  84         libent = (libentry_t *) & header[1];
  85
  86         for (i = 0; i < header->nlibs; i++) {
  87                 if (libent[i].sooffset >= strtabsize ||
  88                                 libent[i].liboffset >= strtabsize)
  89                 {
  90                         _dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname, LDSO_CACHE);
  91                         goto fail;
  92                 }
  93         }
  94
  95         return 0;
  96
  97 fail:
  98         _dl_munmap(_dl_cache_addr, _dl_cache_size);
  99         _dl_cache_addr = (caddr_t) - 1;
 100         return -1;
 101 }
 102
 103 int _dl_unmap_cache(void)
 104 {
 105         if (_dl_cache_addr == NULL || _dl_cache_addr == (caddr_t) - 1)
 106                 return -1;
 107
 108 #if 1
 109         _dl_munmap(_dl_cache_addr, _dl_cache_size);
 110         _dl_cache_addr = NULL;
 111 #endif
 112
 113         return 0;
 114 }
 115 #endif
 116
 117
 118 void
 119 _dl_protect_relro (struct elf_resolve *l)
 120 {
 121         ElfW(Addr) start = ((l->loadaddr + l->relro_addr)
 122                             & ~(_dl_pagesize - 1));
 123         ElfW(Addr) end = ((l->loadaddr + l->relro_addr + l->relro_size)
 124                           & ~(_dl_pagesize - 1));
 125 #if defined (__SUPPORT_LD_DEBUG__)
 126         if (_dl_debug)
 127                 _dl_dprintf(2, "RELRO protecting %s:  start:%x, end:%x\n", l->libname, start, end);
 128 #endif
 129         if (start != end &&
 130             _dl_mprotect ((void *) start, end - start, PROT_READ) < 0) {
 131                 _dl_dprintf(2, "%s: cannot apply additional memory protection after relocation", l->libname);
 132                 _dl_exit(0);
 133         }
 134 }
 135
 136 /* This function's behavior must exactly match that
 137  * in uClibc/ldso/util/ldd.c */
 138 static struct elf_resolve *
 139 search_for_named_library(const char *name, int secure, const char *path_list,
 140         struct dyn_elf **rpnt)
 141 {
 142         char *path, *path_n;
 143         char mylibname[2050];
 144         struct elf_resolve *tpnt;
 145         int done = 0;
 146
 147         if (path_list==NULL)
 148                 return NULL;
 149
 150         /* We need a writable copy of this string */
 151         path = _dl_strdup(path_list);
 152         if (!path) {
 153                 _dl_dprintf(2, "Out of memory!\n");
 154                 _dl_exit(0);
 155         }
 156
 157         /* Unlike ldd.c, don't bother to eliminate double //s */
 158
 159         /* Replace colons with zeros in path_list */
 160         /* : at the beginning or end of path maps to CWD */
 161         /* :: anywhere maps CWD */
 162         /* "" maps to CWD */
 163         path_n = path;
 164         do {
 165                 if (*path == 0) {
 166                         *path = ':';
 167                         done = 1;
 168                 }
 169                 if (*path == ':') {
 170                         *path = 0;
 171                         if (*path_n)
 172                                 _dl_strcpy(mylibname, path_n);
 173                         else
 174                                 _dl_strcpy(mylibname, "."); /* Assume current dir if empty path */
 175                         _dl_strcat(mylibname, "/");
 176                         _dl_strcat(mylibname, name);
 177                         if ((tpnt = _dl_load_elf_shared_library(secure, rpnt, mylibname)) != NULL)
 178                                 return tpnt;
 179                         path_n = path+1;
 180                 }
 181                 path++;
 182         } while (!done);
 183         return NULL;
 184 }
 185
 186 /* Check if the named library is already loaded... */
 187 struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname,
 188                 int trace_loaded_objects)
 189 {
 190         const char *pnt, *pnt1;
 191         struct elf_resolve *tpnt1;
 192         const char *libname, *libname2;
 193         static const char libc[] = "libc.so.";
 194         static const char aborted_wrong_lib[] = "%s: aborted attempt to load %s!\n";
 195
 196         pnt = libname = full_libname;
 197
 198         _dl_if_debug_dprint("Checking if '%s' is already loaded\n", full_libname);
 199         /* quick hack to ensure mylibname buffer doesn't overflow.  don't
 200            allow full_libname or any directory to be longer than 1024. */
 201         if (_dl_strlen(full_libname) > 1024)
 202                 return NULL;
 203
 204         /* Skip over any initial initial './' and '/' stuff to
 205          * get the short form libname with no path garbage */
 206         pnt1 = _dl_strrchr(pnt, '/');
 207         if (pnt1) {
 208                 libname = pnt1 + 1;
 209         }
 210
 211         /* Make sure they are not trying to load the wrong C library!
 212          * This sometimes happens esp with shared libraries when the
 213          * library path is somehow wrong! */
 214 #define isdigit(c)  (c >= '0' && c <= '9')
 215         if ((_dl_strncmp(libname, libc, 8) == 0) &&  _dl_strlen(libname) >=8 &&
 216                         isdigit(libname[8]))
 217         {
 218                 /* Abort attempts to load glibc, libc5, etc */
 219                 if ( libname[8]!='0') {
 220                         if (!trace_loaded_objects) {
 221                                 _dl_dprintf(2, aborted_wrong_lib, libname, _dl_progname);
 222                                 _dl_exit(1);
 223                         }
 224                         return NULL;
 225                 }
 226         }
 227
 228         /* Critical step!  Weed out duplicates early to avoid
 229          * function aliasing, which wastes memory, and causes
 230          * really bad things to happen with weaks and globals. */
 231         for (tpnt1 = _dl_loaded_modules; tpnt1; tpnt1 = tpnt1->next) {
 232
 233                 /* Skip over any initial initial './' and '/' stuff to
 234                  * get the short form libname with no path garbage */
 235                 libname2 = tpnt1->libname;
 236                 pnt1 = _dl_strrchr(libname2, '/');
 237                 if (pnt1) {
 238                         libname2 = pnt1 + 1;
 239                 }
 240
 241                 if (_dl_strcmp(libname2, libname) == 0) {
 242                         /* Well, that was certainly easy */
 243                         return tpnt1;
 244                 }
 245         }
 246
 247         return NULL;
 248 }
 249
 250
 251 /* Used to return error codes back to dlopen et. al.  */
 252 unsigned long _dl_error_number;
 253 unsigned long _dl_internal_error_number;
 254
 255 struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt,
 256         struct elf_resolve *tpnt, char *full_libname, int __attribute__((unused)) trace_loaded_objects)
 257 {
 258         char *pnt, *pnt1;
 259         struct elf_resolve *tpnt1;
 260         char *libname;
 261
 262         _dl_internal_error_number = 0;
 263         libname = full_libname;
 264
 265         /* quick hack to ensure mylibname buffer doesn't overflow.  don't
 266            allow full_libname or any directory to be longer than 1024. */
 267         if (_dl_strlen(full_libname) > 1024)
 268                 goto goof;
 269
 270         /* Skip over any initial initial './' and '/' stuff to
 271          * get the short form libname with no path garbage */
 272         pnt1 = _dl_strrchr(libname, '/');
 273         if (pnt1) {
 274                 libname = pnt1 + 1;
 275         }
 276
 277         /* Critical step!  Weed out duplicates early to avoid
 278          * function aliasing, which wastes memory, and causes
 279          * really bad things to happen with weaks and globals. */
 280         if ((tpnt1=_dl_check_if_named_library_is_loaded(libname, trace_loaded_objects))!=NULL) {
 281                 tpnt1->usage_count++;
 282                 return tpnt1;
 283         }
 284
 285         _dl_if_debug_dprint("\tfind library='%s'; searching\n", libname);
 286         /* If the filename has any '/', try it straight and leave it at that.
 287            For IBCS2 compatibility under linux, we substitute the string
 288            /usr/i486-sysv4/lib for /usr/lib in library names. */
 289
 290         if (libname != full_libname) {
 291                 _dl_if_debug_dprint("\ttrying file='%s'\n", full_libname);
 292                 tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname);
 293                 if (tpnt1) {
 294                         return tpnt1;
 295                 }
 296                 //goto goof;
 297         }
 298
 299         /*
 300          * The ABI specifies that RPATH is searched before LD_LIBRARY_PATH or
 301          * the default path of /usr/lib.  Check in rpath directories.
 302          */
 303         pnt = (tpnt ? (char *) tpnt->dynamic_info[DT_RPATH] : NULL);
 304         if (pnt) {
 305                 pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
 306                 _dl_if_debug_dprint("\tsearching RPATH='%s'\n", pnt);
 307                 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
 308                         return tpnt1;
 309         }
 310
 311         /* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
 312         if (_dl_library_path) {
 313                 _dl_if_debug_dprint("\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
 314                 if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt)) != NULL)
 315                 {
 316                         return tpnt1;
 317                 }
 318         }
 319         /*
 320          * The ABI specifies that RUNPATH is searched after LD_LIBRARY_PATH.
 321          */
 322         pnt = (tpnt ? (char *)tpnt->dynamic_info[DT_RUNPATH] : NULL);
 323         if (pnt) {
 324                 pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
 325                 _dl_if_debug_dprint("\tsearching RUNPATH='%s'\n", pnt);
 326                 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
 327                         return tpnt1;
 328         }
 329
 330         /*
 331          * Where should the cache be searched?  There is no such concept in the
 332          * ABI, so we have some flexibility here.  For now, search it before
 333          * the hard coded paths that follow (i.e before /lib and /usr/lib).
 334          */
 335 #ifdef __LDSO_CACHE_SUPPORT__
 336         if (_dl_cache_addr != NULL && _dl_cache_addr != (caddr_t) - 1) {
 337                 int i;
 338                 header_t *header = (header_t *) _dl_cache_addr;
 339                 libentry_t *libent = (libentry_t *) & header[1];
 340                 char *strs = (char *) &libent[header->nlibs];
 341
 342                 _dl_if_debug_dprint("\tsearching cache='%s'\n", LDSO_CACHE);
 343                 for (i = 0; i < header->nlibs; i++) {
 344                         if ((libent[i].flags == LIB_ELF ||
 345                                                 libent[i].flags == LIB_ELF_LIBC0 ||
 346                                                 libent[i].flags == LIB_ELF_LIBC5) &&
 347                                         _dl_strcmp(libname, strs + libent[i].sooffset) == 0 &&
 348                                         (tpnt1 = _dl_load_elf_shared_library(secure,
 349                                                                                                                  rpnt, strs + libent[i].liboffset)))
 350                                 return tpnt1;
 351                 }
 352         }
 353 #endif
 354
 355         /* Look for libraries wherever the shared library loader
 356          * was installed */
 357         _dl_if_debug_dprint("\tsearching ldso dir='%s'\n", _dl_ldsopath);
 358         if ((tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt)) != NULL)
 359         {
 360                 return tpnt1;
 361         }
 362
 363
 364         /* Lastly, search the standard list of paths for the library.
 365            This list must exactly match the list in uClibc/ldso/util/ldd.c */
 366         _dl_if_debug_dprint("\tsearching full lib path list\n");
 367         if ((tpnt1 = search_for_named_library(libname, secure,
 368                                         UCLIBC_RUNTIME_PREFIX "lib:"
 369                                         UCLIBC_RUNTIME_PREFIX "usr/lib"
 370 #ifndef __LDSO_CACHE_SUPPORT__
 371                                         ":" UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib"
 372 #endif
 373                                         , rpnt)
 374                 ) != NULL)
 375         {
 376                 return tpnt1;
 377         }
 378
 379 goof:
 380         /* Well, we shot our wad on that one.  All we can do now is punt */
 381         if (_dl_internal_error_number)
 382                 _dl_error_number = _dl_internal_error_number;
 383         else
 384                 _dl_error_number = LD_ERROR_NOFILE;
 385 #if defined (__SUPPORT_LD_DEBUG__)
 386         if(_dl_debug) _dl_dprintf(2, "Bummer: could not find '%s'!\n", libname);
 387 #endif
 388         return NULL;
 389 }
 390
 391
 392 /*
 393  * Read one ELF library into memory, mmap it into the correct locations and
 394  * add the symbol info to the symbol chain.  Perform any relocations that
 395  * are required.
 396  */
 397
 398 struct elf_resolve *_dl_load_elf_shared_library(int secure,
 399         struct dyn_elf **rpnt, char *libname)
 400 {
 401         ElfW(Ehdr) *epnt;
 402         unsigned long dynamic_addr = 0;
 403         Elf32_Dyn *dpnt;
 404         struct elf_resolve *tpnt;
 405         ElfW(Phdr) *ppnt;
 406         char *status, *header;
 407         unsigned long dynamic_info[DYNAMIC_SIZE];
 408         unsigned long *lpnt;
 409         unsigned long libaddr;
 410         unsigned long minvma = 0xffffffff, maxvma = 0;
 411         int i, flags, piclib, infile;
 412         ElfW(Addr) relro_addr = 0;
 413         size_t relro_size = 0;
 414
 415         /* If this file is already loaded, skip this step */
 416         tpnt = _dl_check_hashed_files(libname);
 417         if (tpnt) {
 418                 if (*rpnt) {
 419                         (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
 420                         _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
 421                         (*rpnt)->next->prev = (*rpnt);
 422                         *rpnt = (*rpnt)->next;
 423                         (*rpnt)->dyn = tpnt;
 424                         tpnt->symbol_scope = _dl_symbol_tables;
 425                 }
 426                 tpnt->usage_count++;
 427                 tpnt->libtype = elf_lib;
 428 #if defined (__SUPPORT_LD_DEBUG__)
 429                 if(_dl_debug) _dl_dprintf(2, "file='%s';  already loaded\n", libname);
 430 #endif
 431                 return tpnt;
 432         }
 433
 434         /* If we are in secure mode (i.e. a setu/gid binary using LD_PRELOAD),
 435            we don't load the library if it isn't setuid. */
 436
 437         if (secure) {
 438                 struct stat st;
 439
 440                 if (_dl_stat(libname, &st) || !(st.st_mode & S_ISUID))
 441                         return NULL;
 442         }
 443
 444         libaddr = 0;
 445         infile = _dl_open(libname, O_RDONLY, 0);
 446         if (infile < 0) {
 447 #if 0
 448                 /*
 449                  * NO!  When we open shared libraries we may search several paths.
 450                  * it is inappropriate to generate an error here.
 451                  */
 452                 _dl_dprintf(2, "%s: can't open '%s'\n", _dl_progname, libname);
 453 #endif
 454                 _dl_internal_error_number = LD_ERROR_NOFILE;
 455                 return NULL;
 456         }
 457
 458         header = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
 459                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 460         if (_dl_mmap_check_error(header)) {
 461                 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
 462                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 463                 _dl_close(infile);
 464                 return NULL;
 465         };
 466
 467         _dl_read(infile, header, _dl_pagesize);
 468         epnt = (ElfW(Ehdr) *) (intptr_t) header;
 469         if (epnt->e_ident[0] != 0x7f ||
 470                         epnt->e_ident[1] != 'E' ||
 471                         epnt->e_ident[2] != 'L' ||
 472                         epnt->e_ident[3] != 'F')
 473         {
 474                 _dl_dprintf(2, "%s: '%s' is not an ELF file\n", _dl_progname,
 475                                 libname);
 476                 _dl_internal_error_number = LD_ERROR_NOTELF;
 477                 _dl_close(infile);
 478                 _dl_munmap(header, _dl_pagesize);
 479                 return NULL;
 480         };
 481
 482         if ((epnt->e_type != ET_DYN) || (epnt->e_machine != MAGIC1
 483 #ifdef MAGIC2
 484                                 && epnt->e_machine != MAGIC2
 485 #endif
 486                                 ))
 487         {
 488                 _dl_internal_error_number =
 489                         (epnt->e_type != ET_DYN ? LD_ERROR_NOTDYN : LD_ERROR_NOTMAGIC);
 490                 _dl_dprintf(2, "%s: '%s' is not an ELF executable for " ELF_TARGET
 491                                 "\n", _dl_progname, libname);
 492                 _dl_close(infile);
 493                 _dl_munmap(header, _dl_pagesize);
 494                 return NULL;
 495         };
 496
 497         ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 498
 499         piclib = 1;
 500         for (i = 0; i < epnt->e_phnum; i++) {
 501
 502                 if (ppnt->p_type == PT_DYNAMIC) {
 503                         if (dynamic_addr)
 504                                 _dl_dprintf(2, "%s: '%s' has more than one dynamic section\n",
 505                                                 _dl_progname, libname);
 506                         dynamic_addr = ppnt->p_vaddr;
 507                 };
 508
 509                 if (ppnt->p_type == PT_LOAD) {
 510                         /* See if this is a PIC library. */
 511                         if (i == 0 && ppnt->p_vaddr > 0x1000000) {
 512                                 piclib = 0;
 513                                 minvma = ppnt->p_vaddr;
 514                         }
 515                         if (piclib && ppnt->p_vaddr < minvma) {
 516                                 minvma = ppnt->p_vaddr;
 517                         }
 518                         if (((unsigned long) ppnt->p_vaddr + ppnt->p_memsz) > maxvma) {
 519                                 maxvma = ppnt->p_vaddr + ppnt->p_memsz;
 520                         }
 521                 }
 522                 ppnt++;
 523         };
 524
 525         maxvma = (maxvma + ADDR_ALIGN) & ~ADDR_ALIGN;
 526         minvma = minvma & ~0xffffU;
 527
 528         flags = MAP_PRIVATE /*| MAP_DENYWRITE */ ;
 529         if (!piclib)
 530                 flags |= MAP_FIXED;
 531
 532         status = (char *) _dl_mmap((char *) (piclib ? 0 : minvma),
 533                         maxvma - minvma, PROT_NONE, flags | MAP_ANONYMOUS, -1, 0);
 534         if (_dl_mmap_check_error(status)) {
 535                 _dl_dprintf(2, "%s: can't map %s\n", _dl_progname, libname);
 536                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 537                 _dl_close(infile);
 538                 _dl_munmap(header, _dl_pagesize);
 539                 return NULL;
 540         };
 541         libaddr = (unsigned long) status;
 542         flags |= MAP_FIXED;
 543
 544         /* Get the memory to store the library */
 545         ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 546
 547         for (i = 0; i < epnt->e_phnum; i++) {
 548                 if (ppnt->p_type == PT_GNU_RELRO) {
 549                         relro_addr = ppnt->p_vaddr;
 550                         relro_size = ppnt->p_memsz;
 551                 }
 552                 if (ppnt->p_type == PT_LOAD) {
 553
 554                         /* See if this is a PIC library. */
 555                         if (i == 0 && ppnt->p_vaddr > 0x1000000) {
 556                                 piclib = 0;
 557                                 /* flags |= MAP_FIXED; */
 558                         }
 559
 560
 561
 562                         if (ppnt->p_flags & PF_W) {
 563                                 unsigned long map_size;
 564                                 char *cpnt;
 565
 566                                 status = (char *) _dl_mmap((char *) ((piclib ? libaddr : 0) +
 567                                                         (ppnt->p_vaddr & PAGE_ALIGN)), (ppnt->p_vaddr & ADDR_ALIGN)
 568                                                 + ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags, infile,
 569                                                 ppnt->p_offset & OFFS_ALIGN);
 570
 571                                 if (_dl_mmap_check_error(status)) {
 572                                         _dl_dprintf(2, "%s: can't map '%s'\n",
 573                                                         _dl_progname, libname);
 574                                         _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 575                                         _dl_munmap((char *) libaddr, maxvma - minvma);
 576                                         _dl_close(infile);
 577                                         _dl_munmap(header, _dl_pagesize);
 578                                         return NULL;
 579                                 };
 580
 581                                 /* Pad the last page with zeroes. */
 582                                 cpnt = (char *) (status + (ppnt->p_vaddr & ADDR_ALIGN) +
 583                                                 ppnt->p_filesz);
 584                                 while (((unsigned long) cpnt) & ADDR_ALIGN)
 585                                         *cpnt++ = 0;
 586
 587                                 /* I am not quite sure if this is completely
 588                                  * correct to do or not, but the basic way that
 589                                  * we handle bss segments is that we mmap
 590                                  * /dev/zero if there are any pages left over
 591                                  * that are not mapped as part of the file */
 592
 593                                 map_size = (ppnt->p_vaddr + ppnt->p_filesz + ADDR_ALIGN) & PAGE_ALIGN;
 594
 595                                 if (map_size < ppnt->p_vaddr + ppnt->p_memsz)
 596                                         status = (char *) _dl_mmap((char *) map_size +
 597                                                         (piclib ? libaddr : 0),
 598                                                         ppnt->p_vaddr + ppnt->p_memsz - map_size,
 599                                                         LXFLAGS(ppnt->p_flags), flags | MAP_ANONYMOUS, -1, 0);
 600                         } else
 601                                 status = (char *) _dl_mmap((char *) (ppnt->p_vaddr & PAGE_ALIGN)
 602                                                 + (piclib ? libaddr : 0), (ppnt->p_vaddr & ADDR_ALIGN) +
 603                                                 ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags,
 604                                                 infile, ppnt->p_offset & OFFS_ALIGN);
 605                         if (_dl_mmap_check_error(status)) {
 606                                 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
 607                                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 608                                 _dl_munmap((char *) libaddr, maxvma - minvma);
 609                                 _dl_close(infile);
 610                                 _dl_munmap(header, _dl_pagesize);
 611                                 return NULL;
 612                         };
 613
 614                         /* if(libaddr == 0 && piclib) {
 615                            libaddr = (unsigned long) status;
 616                            flags |= MAP_FIXED;
 617                            }; */
 618                 };
 619                 ppnt++;
 620         };
 621         _dl_close(infile);
 622
 623         /* For a non-PIC library, the addresses are all absolute */
 624         if (piclib) {
 625                 dynamic_addr += (unsigned long) libaddr;
 626         }
 627
 628         /*
 629          * OK, the ELF library is now loaded into VM in the correct locations
 630          * The next step is to go through and do the dynamic linking (if needed).
 631          */
 632
 633         /* Start by scanning the dynamic section to get all of the pointers */
 634
 635         if (!dynamic_addr) {
 636                 _dl_internal_error_number = LD_ERROR_NODYNAMIC;
 637                 _dl_dprintf(2, "%s: '%s' is missing a dynamic section\n",
 638                                 _dl_progname, libname);
 639                 _dl_munmap(header, _dl_pagesize);
 640                 return NULL;
 641         }
 642
 643         dpnt = (Elf32_Dyn *) dynamic_addr;
 644         _dl_memset(dynamic_info, 0, sizeof(dynamic_info));
 645         _dl_parse_dynamic_info(dpnt, dynamic_info, NULL, libaddr);
 646         /* If the TEXTREL is set, this means that we need to make the pages
 647            writable before we perform relocations.  Do this now. They get set
 648            back again later. */
 649
 650         if (dynamic_info[DT_TEXTREL]) {
 651 #ifndef __FORCE_SHAREABLE_TEXT_SEGMENTS__
 652                 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 653                 for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
 654                         if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
 655                                 _dl_mprotect((void *) ((piclib ? libaddr : 0) +
 656                                                         (ppnt->p_vaddr & PAGE_ALIGN)),
 657                                                 (ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz,
 658                                                 PROT_READ | PROT_WRITE | PROT_EXEC);
 659                 }
 660 #else
 661                 _dl_dprintf(_dl_debug_file, "Can't modify %s's text section. Use GCC option -fPIC for shared objects, please.\n",libname);
 662                 _dl_exit(1);
 663 #endif
 664         }
 665
 666         tpnt = _dl_add_elf_hash_table(libname, (char *) libaddr, dynamic_info,
 667                         dynamic_addr, 0);
 668         tpnt->relro_addr = relro_addr;
 669         tpnt->relro_size = relro_size;
 670         tpnt->ppnt = (ElfW(Phdr) *)(intptr_t) (tpnt->loadaddr + epnt->e_phoff);
 671         tpnt->n_phent = epnt->e_phnum;
 672
 673         /*
 674          * Add this object into the symbol chain
 675          */
 676         if (*rpnt) {
 677                 (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
 678                 _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
 679                 (*rpnt)->next->prev = (*rpnt);
 680                 *rpnt = (*rpnt)->next;
 681                 (*rpnt)->dyn = tpnt;
 682                 tpnt->symbol_scope = _dl_symbol_tables;
 683         }
 684         tpnt->usage_count++;
 685         tpnt->libtype = elf_lib;
 686
 687         /*
 688          * OK, the next thing we need to do is to insert the dynamic linker into
 689          * the proper entry in the GOT so that the PLT symbols can be properly
 690          * resolved.
 691          */
 692
 693         lpnt = (unsigned long *) dynamic_info[DT_PLTGOT];
 694
 695         if (lpnt) {
 696                 lpnt = (unsigned long *) (dynamic_info[DT_PLTGOT]);
 697                 INIT_GOT(lpnt, tpnt);
 698         };
 699
 700 #if defined (__SUPPORT_LD_DEBUG__)
 701         if(_dl_debug) {
 702                 _dl_dprintf(2, "\n\tfile='%s';  generating link map\n", libname);
 703                 _dl_dprintf(2, "\t\tdynamic: %x  base: %x\n",
 704                                 dynamic_addr, libaddr);
 705                 _dl_dprintf(2, "\t\t  entry: %x  phdr: %x  phnum: %x\n\n",
 706                                 epnt->e_entry + libaddr, tpnt->ppnt, tpnt->n_phent);
 707
 708         }
 709 #endif
 710         _dl_munmap(header, _dl_pagesize);
 711
 712         return tpnt;
 713 }
 714 /* now_flag must be RTLD_NOW or zero */
 715 int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
 716 {
 717         int goof = 0;
 718         struct elf_resolve *tpnt;
 719         Elf32_Word reloc_size, reloc_addr, relative_count;
 720
 721         if (rpnt->next)
 722                 goof += _dl_fixup(rpnt->next, now_flag);
 723         tpnt = rpnt->dyn;
 724
 725 #if defined (__SUPPORT_LD_DEBUG__)
 726         if(!(tpnt->init_flag & RELOCS_DONE))
 727                 _dl_if_debug_dprint("\nrelocation processing: %s\n", tpnt->libname);
 728 #endif
 729
 730         if (unlikely(tpnt->dynamic_info[UNSUPPORTED_RELOC_TYPE])) {
 731                 _dl_if_debug_dprint("%s: can't handle %s relocation records\n",
 732                                 _dl_progname, UNSUPPORTED_RELOC_STR);
 733                 goof++;
 734                 return goof;
 735         }
 736
 737         reloc_size = tpnt->dynamic_info[DT_RELOC_TABLE_SIZE];
 738 /* On some machines, notably SPARC & PPC, DT_REL* includes DT_JMPREL in its
 739    range.  Note that according to the ELF spec, this is completely legal! */
 740 #ifdef ELF_MACHINE_PLTREL_OVERLAP
 741         reloc_size -= tpnt->dynamic_info [DT_PLTRELSZ];
 742 #endif
 743         if (tpnt->dynamic_info[DT_RELOC_TABLE_ADDR] &&
 744             !(tpnt->init_flag & RELOCS_DONE)) {
 745                 tpnt->init_flag |= RELOCS_DONE;
 746                 reloc_addr = tpnt->dynamic_info[DT_RELOC_TABLE_ADDR];
 747                 relative_count = tpnt->dynamic_info[DT_RELCONT_IDX];
 748                 if (relative_count) { /* Optimize the XX_RELATIVE relocations if possible */
 749                         reloc_size -= relative_count * sizeof(ELF_RELOC);
 750                         elf_machine_relative (tpnt->loadaddr, reloc_addr, relative_count);
 751                         reloc_addr += relative_count * sizeof(ELF_RELOC);
 752                 }
 753                 goof += _dl_parse_relocation_information(rpnt,
 754                                 reloc_addr,
 755                                 reloc_size);
 756         }
 757         if (tpnt->dynamic_info[DT_BIND_NOW])
 758                 now_flag = RTLD_NOW;
 759         if (tpnt->dynamic_info[DT_JMPREL] &&
 760             (!(tpnt->init_flag & JMP_RELOCS_DONE) ||
 761              (now_flag && !(tpnt->rtld_flags & now_flag)))) {
 762                 tpnt->rtld_flags |= now_flag;
 763                 tpnt->init_flag |= JMP_RELOCS_DONE;
 764                 if (!(tpnt->rtld_flags & RTLD_NOW)) {
 765                         _dl_parse_lazy_relocation_information(rpnt,
 766                                         tpnt->dynamic_info[DT_JMPREL],
 767                                         tpnt->dynamic_info [DT_PLTRELSZ]);
 768                 } else {
 769                         goof += _dl_parse_relocation_information(rpnt,
 770                                         tpnt->dynamic_info[DT_JMPREL],
 771                                         tpnt->dynamic_info[DT_PLTRELSZ]);
 772                 }
 773         }
 774         return goof;
 775 }
 776
 777 /* Minimal printf which handles only %s, %d, and %x */
 778 void _dl_dprintf(int fd, const char *fmt, ...)
 779 {
 780         int num;
 781         va_list args;
 782         char *start, *ptr, *string;
 783         static char *buf;
 784
 785         buf = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
 786                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 787         if (_dl_mmap_check_error(buf)) {
 788                 _dl_write(fd, "mmap of a spare page failed!\n", 29);
 789                 _dl_exit(20);
 790         }
 791
 792         start = ptr = buf;
 793
 794         if (!fmt)
 795                 return;
 796
 797         if (_dl_strlen(fmt) >= (_dl_pagesize - 1)) {
 798                 _dl_write(fd, "overflow\n", 11);
 799                 _dl_exit(20);
 800         }
 801
 802         _dl_strcpy(buf, fmt);
 803         va_start(args, fmt);
 804
 805         while (start) {
 806                 while (*ptr != '%' && *ptr) {
 807                         ptr++;
 808                 }
 809
 810                 if (*ptr == '%') {
 811                         *ptr++ = '\0';
 812                         _dl_write(fd, start, _dl_strlen(start));
 813
 814                         switch (*ptr++) {
 815                                 case 's':
 816                                         string = va_arg(args, char *);
 817
 818                                         if (!string)
 819                                                 _dl_write(fd, "(null)", 6);
 820                                         else
 821                                                 _dl_write(fd, string, _dl_strlen(string));
 822                                         break;
 823
 824                                 case 'i':
 825                                 case 'd':
 826                                         {
 827                                                 char tmp[22];
 828                                                 num = va_arg(args, int);
 829
 830                                                 string = _dl_simple_ltoa(tmp, num);
 831                                                 _dl_write(fd, string, _dl_strlen(string));
 832                                                 break;
 833                                         }
 834                                 case 'x':
 835                                 case 'X':
 836                                         {
 837                                                 char tmp[22];
 838                                                 num = va_arg(args, int);
 839
 840                                                 string = _dl_simple_ltoahex(tmp, num);
 841                                                 _dl_write(fd, string, _dl_strlen(string));
 842                                                 break;
 843                                         }
 844                                 default:
 845                                         _dl_write(fd, "(null)", 6);
 846                                         break;
 847                         }
 848
 849                         start = ptr;
 850                 } else {
 851                         _dl_write(fd, start, _dl_strlen(start));
 852                         start = NULL;
 853                 }
 854         }
 855         _dl_munmap(buf, _dl_pagesize);
 856         return;
 857 }
 858
 859 char *_dl_strdup(const char *string)
 860 {
 861         char *retval;
 862         int len;
 863
 864         len = _dl_strlen(string);
 865         retval = _dl_malloc(len + 1);
 866         _dl_strcpy(retval, string);
 867         return retval;
 868 }
 869
 870 void _dl_parse_dynamic_info(Elf32_Dyn *dpnt, unsigned long dynamic_info[], void *debug_addr, Elf32_Addr load_off)
 871 {
 872         __dl_parse_dynamic_info(dpnt, dynamic_info, debug_addr, load_off);
 873 }
 874 #ifdef __USE_GNU
 875 #if ! defined LIBDL || (! defined PIC && ! defined __PIC__)
 876 int
 877 __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, size_t size, void *data), void *data)
 878 {
 879         struct elf_resolve *l;
 880         struct dl_phdr_info info;
 881         int ret = 0;
 882
 883         for (l = _dl_loaded_modules; l != NULL; l = l->next) {
 884                 info.dlpi_addr = l->loadaddr;
 885                 info.dlpi_name = l->libname;
 886                 info.dlpi_phdr = l->ppnt;
 887                 info.dlpi_phnum = l->n_phent;
 888                 ret = callback (&info, sizeof (struct dl_phdr_info), data);
 889                 if (ret)
 890                         break;
 891         }
 892         return ret;
 893 }
 894 strong_alias(__dl_iterate_phdr, dl_iterate_phdr);
 895 #endif
 896 #endif