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@codpoet.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 USE_CACHE
  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) {
  55                 _dl_dprintf(2, "%s: can't open cache '%s'\n", _dl_progname, LDSO_CACHE);
  56                 _dl_cache_addr = (caddr_t) - 1; /* so we won't try again */
  57                 return -1;
  58         }
  59
  60         _dl_cache_size = st.st_size;
  61         _dl_cache_addr = (caddr_t) _dl_mmap(0, _dl_cache_size, PROT_READ, MAP_SHARED, fd, 0);
  62         _dl_close(fd);
  63         if (_dl_mmap_check_error(_dl_cache_addr)) {
  64                 _dl_dprintf(2, "%s: can't map cache '%s'\n",
  65                                 _dl_progname, LDSO_CACHE);
  66                 return -1;
  67         }
  68
  69         header = (header_t *) _dl_cache_addr;
  70
  71         if (_dl_cache_size < sizeof(header_t) ||
  72                         _dl_memcmp(header->magic, LDSO_CACHE_MAGIC, LDSO_CACHE_MAGIC_LEN)
  73                         || _dl_memcmp(header->version, LDSO_CACHE_VER, LDSO_CACHE_VER_LEN)
  74                         || _dl_cache_size <
  75                         (sizeof(header_t) + header->nlibs * sizeof(libentry_t))
  76                         || _dl_cache_addr[_dl_cache_size - 1] != '\0')
  77         {
  78                 _dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname,
  79                                 LDSO_CACHE);
  80                 goto fail;
  81         }
  82
  83         strtabsize = _dl_cache_size - sizeof(header_t) -
  84                 header->nlibs * sizeof(libentry_t);
  85         libent = (libentry_t *) & header[1];
  86
  87         for (i = 0; i < header->nlibs; i++) {
  88                 if (libent[i].sooffset >= strtabsize ||
  89                                 libent[i].liboffset >= strtabsize)
  90                 {
  91                         _dl_dprintf(2, "%s: cache '%s' is corrupt\n", _dl_progname, LDSO_CACHE);
  92                         goto fail;
  93                 }
  94         }
  95
  96         return 0;
  97
  98 fail:
  99         _dl_munmap(_dl_cache_addr, _dl_cache_size);
 100         _dl_cache_addr = (caddr_t) - 1;
 101         return -1;
 102 }
 103
 104 int _dl_unmap_cache(void)
 105 {
 106         if (_dl_cache_addr == NULL || _dl_cache_addr == (caddr_t) - 1)
 107                 return -1;
 108
 109 #if 1
 110         _dl_munmap(_dl_cache_addr, _dl_cache_size);
 111         _dl_cache_addr = NULL;
 112 #endif
 113
 114         return 0;
 115 }
 116 #endif
 117
 118 /* This function's behavior must exactly match that
 119  * in uClibc/ldso/util/ldd.c */
 120 static struct elf_resolve *
 121 search_for_named_library(const char *name, int secure, const char *path_list,
 122         struct dyn_elf **rpnt)
 123 {
 124         int i, count = 1;
 125         char *path, *path_n;
 126         char mylibname[2050];
 127         struct elf_resolve *tpnt1;
 128
 129         if (path_list==NULL)
 130                 return NULL;
 131
 132         /* We need a writable copy of this string */
 133         path = _dl_strdup(path_list);
 134         if (!path) {
 135                 _dl_dprintf(2, "Out of memory!\n");
 136                 _dl_exit(0);
 137         }
 138
 139
 140         /* Unlike ldd.c, don't bother to eliminate double //s */
 141
 142
 143         /* Replace colons with zeros in path_list and count them */
 144         for(i=_dl_strlen(path); i > 0; i--) {
 145                 if (path[i]==':') {
 146                         path[i]=0;
 147                         count++;
 148                 }
 149         }
 150
 151         path_n = path;
 152         for (i = 0; i < count; i++) {
 153                 _dl_strcpy(mylibname, path_n);
 154                 _dl_strcat(mylibname, "/");
 155                 _dl_strcat(mylibname, name);
 156                 if ((tpnt1 = _dl_load_elf_shared_library(secure, rpnt, mylibname)) != NULL)
 157                 {
 158                         return tpnt1;
 159                 }
 160                 path_n += (_dl_strlen(path_n) + 1);
 161         }
 162         return NULL;
 163 }
 164
 165 /* Check if the named library is already loaded... */
 166 struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname,
 167                 int trace_loaded_objects)
 168 {
 169         const char *pnt, *pnt1;
 170         struct elf_resolve *tpnt1;
 171         const char *libname, *libname2;
 172         static const char libc[] = "libc.so.";
 173         static const char aborted_wrong_lib[] = "%s: aborted attempt to load %s!\n";
 174
 175         pnt = libname = full_libname;
 176
 177 #if defined (__SUPPORT_LD_DEBUG__)
 178         if(_dl_debug)
 179                 _dl_dprintf(_dl_debug_file, "Checking if '%s' is already loaded\n", full_libname);
 180 #endif
 181         /* quick hack to ensure mylibname buffer doesn't overflow.  don't
 182            allow full_libname or any directory to be longer than 1024. */
 183         if (_dl_strlen(full_libname) > 1024)
 184                 return NULL;
 185
 186         /* Skip over any initial initial './' and '/' stuff to
 187          * get the short form libname with no path garbage */
 188         pnt1 = _dl_strrchr(pnt, '/');
 189         if (pnt1) {
 190                 libname = pnt1 + 1;
 191         }
 192
 193         /* Make sure they are not trying to load the wrong C library!
 194          * This sometimes happens esp with shared libraries when the
 195          * library path is somehow wrong! */
 196 #define isdigit(c)  (c >= '0' && c <= '9')
 197         if ((_dl_strncmp(libname, libc, 8) == 0) &&  _dl_strlen(libname) >=8 &&
 198                         isdigit(libname[8]))
 199         {
 200                 /* Abort attempts to load glibc, libc5, etc */
 201                 if ( libname[8]!='0') {
 202                         if (!trace_loaded_objects) {
 203                                 _dl_dprintf(2, aborted_wrong_lib, libname, _dl_progname);
 204                                 _dl_exit(1);
 205                         }
 206                         return NULL;
 207                 }
 208         }
 209
 210         /* Critical step!  Weed out duplicates early to avoid
 211          * function aliasing, which wastes memory, and causes
 212          * really bad things to happen with weaks and globals. */
 213         for (tpnt1 = _dl_loaded_modules; tpnt1; tpnt1 = tpnt1->next) {
 214
 215                 /* Skip over any initial initial './' and '/' stuff to
 216                  * get the short form libname with no path garbage */
 217                 libname2 = tpnt1->libname;
 218                 pnt1 = _dl_strrchr(libname2, '/');
 219                 if (pnt1) {
 220                         libname2 = pnt1 + 1;
 221                 }
 222
 223                 if (_dl_strcmp(libname2, libname) == 0) {
 224                         /* Well, that was certainly easy */
 225                         return tpnt1;
 226                 }
 227         }
 228
 229         return NULL;
 230 }
 231
 232
 233 /* Used to return error codes back to dlopen et. al.  */
 234 unsigned long _dl_error_number;
 235 unsigned long _dl_internal_error_number;
 236
 237 struct elf_resolve *_dl_load_shared_library(int secure, struct dyn_elf **rpnt,
 238         struct elf_resolve *tpnt, char *full_libname, int trace_loaded_objects)
 239 {
 240         char *pnt, *pnt1;
 241         struct elf_resolve *tpnt1;
 242         char *libname;
 243
 244         _dl_internal_error_number = 0;
 245         libname = full_libname;
 246
 247         /* quick hack to ensure mylibname buffer doesn't overflow.  don't
 248            allow full_libname or any directory to be longer than 1024. */
 249         if (_dl_strlen(full_libname) > 1024)
 250                 goto goof;
 251
 252         /* Skip over any initial initial './' and '/' stuff to
 253          * get the short form libname with no path garbage */
 254         pnt1 = _dl_strrchr(libname, '/');
 255         if (pnt1) {
 256                 libname = pnt1 + 1;
 257         }
 258
 259         /* Critical step!  Weed out duplicates early to avoid
 260          * function aliasing, which wastes memory, and causes
 261          * really bad things to happen with weaks and globals. */
 262         if ((tpnt1=_dl_check_if_named_library_is_loaded(libname, trace_loaded_objects))!=NULL)
 263                 return tpnt1;
 264
 265 #if defined (__SUPPORT_LD_DEBUG__)
 266         if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfind library='%s'; searching\n", libname);
 267 #endif
 268         /* If the filename has any '/', try it straight and leave it at that.
 269            For IBCS2 compatibility under linux, we substitute the string
 270            /usr/i486-sysv4/lib for /usr/lib in library names. */
 271
 272         if (libname != full_libname) {
 273 #if defined (__SUPPORT_LD_DEBUG__)
 274                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\ttrying file='%s'\n", full_libname);
 275 #endif
 276                 tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname);
 277                 if (tpnt1) {
 278                         return tpnt1;
 279                 }
 280                 //goto goof;
 281         }
 282
 283         /*
 284          * The ABI specifies that RPATH is searched before LD_*_PATH or
 285          * the default path of /usr/lib.  Check in rpath directories.
 286          */
 287         for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
 288                 if (tpnt->libtype == elf_executable) {
 289                         pnt = (char *) tpnt->dynamic_info[DT_RPATH];
 290                         if (pnt) {
 291                                 pnt += (unsigned long) tpnt->loadaddr + tpnt->dynamic_info[DT_STRTAB];
 292 #if defined (__SUPPORT_LD_DEBUG__)
 293                                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching RPATH='%s'\n", pnt);
 294 #endif
 295                                 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
 296                                 {
 297                                         return tpnt1;
 298                                 }
 299                         }
 300                 }
 301         }
 302
 303         /* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
 304         if (_dl_library_path) {
 305 #if defined (__SUPPORT_LD_DEBUG__)
 306                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
 307 #endif
 308                 if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt)) != NULL)
 309                 {
 310                         return tpnt1;
 311                 }
 312         }
 313
 314         /*
 315          * Where should the cache be searched?  There is no such concept in the
 316          * ABI, so we have some flexibility here.  For now, search it before
 317          * the hard coded paths that follow (i.e before /lib and /usr/lib).
 318          */
 319 #ifdef USE_CACHE
 320         if (_dl_cache_addr != NULL && _dl_cache_addr != (caddr_t) - 1) {
 321                 int i;
 322                 header_t *header = (header_t *) _dl_cache_addr;
 323                 libentry_t *libent = (libentry_t *) & header[1];
 324                 char *strs = (char *) &libent[header->nlibs];
 325
 326 #if defined (__SUPPORT_LD_DEBUG__)
 327                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching cache='%s'\n", LDSO_CACHE);
 328 #endif
 329                 for (i = 0; i < header->nlibs; i++) {
 330                         if ((libent[i].flags == LIB_ELF ||
 331                                                 libent[i].flags == LIB_ELF_LIBC5) &&
 332                                         _dl_strcmp(libname, strs + libent[i].sooffset) == 0 &&
 333                                         (tpnt1 = _dl_load_elf_shared_library(secure,
 334                                                                                                                  rpnt, strs + libent[i].liboffset)))
 335                                 return tpnt1;
 336                 }
 337         }
 338 #endif
 339
 340         /* Look for libraries wherever the shared library loader
 341          * was installed */
 342 #if defined (__SUPPORT_LD_DEBUG__)
 343         if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching ldso dir='%s'\n", _dl_ldsopath);
 344 #endif
 345         if ((tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt)) != NULL)
 346         {
 347                 return tpnt1;
 348         }
 349
 350
 351         /* Lastly, search the standard list of paths for the library.
 352            This list must exactly match the list in uClibc/ldso/util/ldd.c */
 353 #if defined (__SUPPORT_LD_DEBUG__)
 354         if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching full lib path list\n");
 355 #endif
 356         if ((tpnt1 = search_for_named_library(libname, secure,
 357                                         UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib:"
 358                                         UCLIBC_RUNTIME_PREFIX "usr/lib:"
 359                                         UCLIBC_RUNTIME_PREFIX "lib:"
 360                                         "/usr/lib:"
 361                                         "/lib", rpnt)
 362                 ) != NULL)
 363         {
 364                 return tpnt1;
 365         }
 366
 367 goof:
 368         /* Well, we shot our wad on that one.  All we can do now is punt */
 369         if (_dl_internal_error_number)
 370                 _dl_error_number = _dl_internal_error_number;
 371         else
 372                 _dl_error_number = LD_ERROR_NOFILE;
 373 #if defined (__SUPPORT_LD_DEBUG__)
 374         if(_dl_debug) _dl_dprintf(2, "Bummer: could not find '%s'!\n", libname);
 375 #endif
 376         return NULL;
 377 }
 378
 379
 380 /*
 381  * Read one ELF library into memory, mmap it into the correct locations and
 382  * add the symbol info to the symbol chain.  Perform any relocations that
 383  * are required.
 384  */
 385
 386 struct elf_resolve *_dl_load_elf_shared_library(int secure,
 387         struct dyn_elf **rpnt, char *libname)
 388 {
 389         ElfW(Ehdr) *epnt;
 390         unsigned long dynamic_addr = 0;
 391         unsigned long dynamic_size = 0;
 392         Elf32_Dyn *dpnt;
 393         struct elf_resolve *tpnt;
 394         ElfW(Phdr) *ppnt;
 395         char *status, *header;
 396         unsigned long dynamic_info[24];
 397         unsigned long *lpnt;
 398         unsigned long libaddr;
 399         unsigned long minvma = 0xffffffff, maxvma = 0;
 400         int i, flags, piclib, infile;
 401
 402         /* If this file is already loaded, skip this step */
 403         tpnt = _dl_check_hashed_files(libname);
 404         if (tpnt) {
 405                 if (*rpnt) {
 406                         (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
 407                         _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
 408                         (*rpnt)->next->prev = (*rpnt);
 409                         *rpnt = (*rpnt)->next;
 410                         (*rpnt)->dyn = tpnt;
 411                         tpnt->symbol_scope = _dl_symbol_tables;
 412                 }
 413                 tpnt->usage_count++;
 414                 tpnt->libtype = elf_lib;
 415 #if defined (__SUPPORT_LD_DEBUG__)
 416                 if(_dl_debug) _dl_dprintf(2, "file='%s';  already loaded\n", libname);
 417 #endif
 418                 return tpnt;
 419         }
 420
 421         /* If we are in secure mode (i.e. a setu/gid binary using LD_PRELOAD),
 422            we don't load the library if it isn't setuid. */
 423
 424         if (secure) {
 425                 struct stat st;
 426
 427                 if (_dl_stat(libname, &st) || !(st.st_mode & S_ISUID))
 428                         return NULL;
 429         }
 430
 431         libaddr = 0;
 432         infile = _dl_open(libname, O_RDONLY);
 433         if (infile < 0) {
 434 #if 0
 435                 /*
 436                  * NO!  When we open shared libraries we may search several paths.
 437                  * it is inappropriate to generate an error here.
 438                  */
 439                 _dl_dprintf(2, "%s: can't open '%s'\n", _dl_progname, libname);
 440 #endif
 441                 _dl_internal_error_number = LD_ERROR_NOFILE;
 442                 return NULL;
 443         }
 444
 445         header = _dl_mmap((void *) 0, PAGE_SIZE, PROT_READ | PROT_WRITE,
 446                         MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
 447         if (_dl_mmap_check_error(header)) {
 448                 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
 449                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 450                 _dl_close(infile);
 451                 return NULL;
 452         };
 453
 454         _dl_read(infile, header, PAGE_SIZE);
 455         epnt = (ElfW(Ehdr) *) (intptr_t) header;
 456         if (epnt->e_ident[0] != 0x7f ||
 457                         epnt->e_ident[1] != 'E' ||
 458                         epnt->e_ident[2] != 'L' ||
 459                         epnt->e_ident[3] != 'F')
 460         {
 461                 _dl_dprintf(2, "%s: '%s' is not an ELF file\n", _dl_progname,
 462                                 libname);
 463                 _dl_internal_error_number = LD_ERROR_NOTELF;
 464                 _dl_close(infile);
 465                 _dl_munmap(header, PAGE_SIZE);
 466                 return NULL;
 467         };
 468
 469         if ((epnt->e_type != ET_DYN) || (epnt->e_machine != MAGIC1
 470 #ifdef MAGIC2
 471                                 && epnt->e_machine != MAGIC2
 472 #endif
 473                                 ))
 474         {
 475                 _dl_internal_error_number =
 476                         (epnt->e_type != ET_DYN ? LD_ERROR_NOTDYN : LD_ERROR_NOTMAGIC);
 477                 _dl_dprintf(2, "%s: '%s' is not an ELF executable for " ELF_TARGET
 478                                 "\n", _dl_progname, libname);
 479                 _dl_close(infile);
 480                 _dl_munmap(header, PAGE_SIZE);
 481                 return NULL;
 482         };
 483
 484         ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 485
 486         piclib = 1;
 487         for (i = 0; i < epnt->e_phnum; i++) {
 488
 489                 if (ppnt->p_type == PT_DYNAMIC) {
 490                         if (dynamic_addr)
 491                                 _dl_dprintf(2, "%s: '%s' has more than one dynamic section\n",
 492                                                 _dl_progname, libname);
 493                         dynamic_addr = ppnt->p_vaddr;
 494                         dynamic_size = ppnt->p_filesz;
 495                 };
 496
 497                 if (ppnt->p_type == PT_LOAD) {
 498                         /* See if this is a PIC library. */
 499                         if (i == 0 && ppnt->p_vaddr > 0x1000000) {
 500                                 piclib = 0;
 501                                 minvma = ppnt->p_vaddr;
 502                         }
 503                         if (piclib && ppnt->p_vaddr < minvma) {
 504                                 minvma = ppnt->p_vaddr;
 505                         }
 506                         if (((unsigned long) ppnt->p_vaddr + ppnt->p_memsz) > maxvma) {
 507                                 maxvma = ppnt->p_vaddr + ppnt->p_memsz;
 508                         }
 509                 }
 510                 ppnt++;
 511         };
 512
 513         maxvma = (maxvma + ADDR_ALIGN) & ~ADDR_ALIGN;
 514         minvma = minvma & ~0xffffU;
 515
 516         flags = MAP_PRIVATE /*| MAP_DENYWRITE */ ;
 517         if (!piclib)
 518                 flags |= MAP_FIXED;
 519
 520         status = (char *) _dl_mmap((char *) (piclib ? 0 : minvma),
 521                         maxvma - minvma, PROT_NONE, flags | MAP_ANONYMOUS, -1, 0);
 522         if (_dl_mmap_check_error(status)) {
 523                 _dl_dprintf(2, "%s: can't map %s\n", _dl_progname, libname);
 524                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 525                 _dl_close(infile);
 526                 _dl_munmap(header, PAGE_SIZE);
 527                 return NULL;
 528         };
 529         libaddr = (unsigned long) status;
 530         flags |= MAP_FIXED;
 531
 532         /* Get the memory to store the library */
 533         ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 534
 535         for (i = 0; i < epnt->e_phnum; i++) {
 536                 if (ppnt->p_type == PT_LOAD) {
 537
 538                         /* See if this is a PIC library. */
 539                         if (i == 0 && ppnt->p_vaddr > 0x1000000) {
 540                                 piclib = 0;
 541                                 /* flags |= MAP_FIXED; */
 542                         }
 543
 544
 545
 546                         if (ppnt->p_flags & PF_W) {
 547                                 unsigned long map_size;
 548                                 char *cpnt;
 549
 550                                 status = (char *) _dl_mmap((char *) ((piclib ? libaddr : 0) +
 551                                                         (ppnt->p_vaddr & PAGE_ALIGN)), (ppnt->p_vaddr & ADDR_ALIGN)
 552                                                 + ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags, infile,
 553                                                 ppnt->p_offset & OFFS_ALIGN);
 554
 555                                 if (_dl_mmap_check_error(status)) {
 556                                         _dl_dprintf(2, "%s: can't map '%s'\n",
 557                                                         _dl_progname, libname);
 558                                         _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 559                                         _dl_munmap((char *) libaddr, maxvma - minvma);
 560                                         _dl_close(infile);
 561                                         _dl_munmap(header, PAGE_SIZE);
 562                                         return NULL;
 563                                 };
 564
 565                                 /* Pad the last page with zeroes. */
 566                                 cpnt = (char *) (status + (ppnt->p_vaddr & ADDR_ALIGN) +
 567                                                 ppnt->p_filesz);
 568                                 while (((unsigned long) cpnt) & ADDR_ALIGN)
 569                                         *cpnt++ = 0;
 570
 571                                 /* I am not quite sure if this is completely
 572                                  * correct to do or not, but the basic way that
 573                                  * we handle bss segments is that we mmap
 574                                  * /dev/zero if there are any pages left over
 575                                  * that are not mapped as part of the file */
 576
 577                                 map_size = (ppnt->p_vaddr + ppnt->p_filesz + ADDR_ALIGN) & PAGE_ALIGN;
 578
 579                                 if (map_size < ppnt->p_vaddr + ppnt->p_memsz)
 580                                         status = (char *) _dl_mmap((char *) map_size +
 581                                                         (piclib ? libaddr : 0),
 582                                                         ppnt->p_vaddr + ppnt->p_memsz - map_size,
 583                                                         LXFLAGS(ppnt->p_flags), flags | MAP_ANONYMOUS, -1, 0);
 584                         } else
 585                                 status = (char *) _dl_mmap((char *) (ppnt->p_vaddr & PAGE_ALIGN)
 586                                                 + (piclib ? libaddr : 0), (ppnt->p_vaddr & ADDR_ALIGN) +
 587                                                 ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags,
 588                                                 infile, ppnt->p_offset & OFFS_ALIGN);
 589                         if (_dl_mmap_check_error(status)) {
 590                                 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
 591                                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 592                                 _dl_munmap((char *) libaddr, maxvma - minvma);
 593                                 _dl_close(infile);
 594                                 _dl_munmap(header, PAGE_SIZE);
 595                                 return NULL;
 596                         };
 597
 598                         /* if(libaddr == 0 && piclib) {
 599                            libaddr = (unsigned long) status;
 600                            flags |= MAP_FIXED;
 601                            }; */
 602                 };
 603                 ppnt++;
 604         };
 605         _dl_close(infile);
 606
 607         /* For a non-PIC library, the addresses are all absolute */
 608         if (piclib) {
 609                 dynamic_addr += (unsigned long) libaddr;
 610         }
 611
 612         /*
 613          * OK, the ELF library is now loaded into VM in the correct locations
 614          * The next step is to go through and do the dynamic linking (if needed).
 615          */
 616
 617         /* Start by scanning the dynamic section to get all of the pointers */
 618
 619         if (!dynamic_addr) {
 620                 _dl_internal_error_number = LD_ERROR_NODYNAMIC;
 621                 _dl_dprintf(2, "%s: '%s' is missing a dynamic section\n",
 622                                 _dl_progname, libname);
 623                 _dl_munmap(header, PAGE_SIZE);
 624                 return NULL;
 625         }
 626
 627         dpnt = (Elf32_Dyn *) dynamic_addr;
 628
 629         dynamic_size = dynamic_size / sizeof(Elf32_Dyn);
 630         _dl_memset(dynamic_info, 0, sizeof(dynamic_info));
 631
 632 #if defined(__mips__)
 633         {
 634
 635                 int indx = 1;
 636                 Elf32_Dyn *dpnt = (Elf32_Dyn *) dynamic_addr;
 637
 638                 while(dpnt->d_tag) {
 639                         dpnt++;
 640                         indx++;
 641                 }
 642                 dynamic_size = indx;
 643         }
 644 #endif
 645
 646         {
 647                 unsigned long indx;
 648
 649                 for (indx = 0; indx < dynamic_size; indx++)
 650                 {
 651                         if (dpnt->d_tag > DT_JMPREL) {
 652                                 dpnt++;
 653                                 continue;
 654                         }
 655                         dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
 656                         if (dpnt->d_tag == DT_TEXTREL)
 657                                 dynamic_info[DT_TEXTREL] = 1;
 658                         dpnt++;
 659                 };
 660         }
 661
 662         /* If the TEXTREL is set, this means that we need to make the pages
 663            writable before we perform relocations.  Do this now. They get set
 664            back again later. */
 665
 666         if (dynamic_info[DT_TEXTREL]) {
 667 #ifndef FORCE_SHAREABLE_TEXT_SEGMENTS
 668                 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 669                 for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
 670                         if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
 671                                 _dl_mprotect((void *) ((piclib ? libaddr : 0) +
 672                                                         (ppnt->p_vaddr & PAGE_ALIGN)),
 673                                                 (ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz,
 674                                                 PROT_READ | PROT_WRITE | PROT_EXEC);
 675                 }
 676 #else
 677                 _dl_dprintf(_dl_debug_file, "Can't modify %s's text section. Use GCC option -fPIC for shared objects, please.\n",libname);
 678                 _dl_exit(1);
 679 #endif
 680         }
 681
 682         tpnt = _dl_add_elf_hash_table(libname, (char *) libaddr, dynamic_info,
 683                         dynamic_addr, dynamic_size);
 684
 685         tpnt->ppnt = (ElfW(Phdr) *)(intptr_t) (tpnt->loadaddr + epnt->e_phoff);
 686         tpnt->n_phent = epnt->e_phnum;
 687
 688         /*
 689          * Add this object into the symbol chain
 690          */
 691         if (*rpnt) {
 692                 (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
 693                 _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
 694                 (*rpnt)->next->prev = (*rpnt);
 695                 *rpnt = (*rpnt)->next;
 696                 (*rpnt)->dyn = tpnt;
 697                 tpnt->symbol_scope = _dl_symbol_tables;
 698         }
 699         tpnt->usage_count++;
 700         tpnt->libtype = elf_lib;
 701
 702         /*
 703          * OK, the next thing we need to do is to insert the dynamic linker into
 704          * the proper entry in the GOT so that the PLT symbols can be properly
 705          * resolved.
 706          */
 707
 708         lpnt = (unsigned long *) dynamic_info[DT_PLTGOT];
 709
 710         if (lpnt) {
 711                 lpnt = (unsigned long *) (dynamic_info[DT_PLTGOT] +
 712                                 ((int) libaddr));
 713                 INIT_GOT(lpnt, tpnt);
 714         };
 715
 716 #if defined (__SUPPORT_LD_DEBUG__)
 717         if(_dl_debug) {
 718                 _dl_dprintf(2, "\n\tfile='%s';  generating link map\n", libname);
 719                 _dl_dprintf(2, "\t\tdynamic: %x  base: %x   size: %x\n",
 720                                 dynamic_addr, libaddr, dynamic_size);
 721                 _dl_dprintf(2, "\t\t  entry: %x  phdr: %x  phnum: %d\n\n",
 722                                 epnt->e_entry + libaddr, tpnt->ppnt, tpnt->n_phent);
 723
 724         }
 725 #endif
 726         _dl_munmap(header, PAGE_SIZE);
 727
 728         return tpnt;
 729 }
 730
 731 int _dl_fixup(struct dyn_elf *rpnt, int flag)
 732 {
 733         int goof = 0;
 734         struct elf_resolve *tpnt;
 735
 736         if (rpnt->next)
 737                 goof += _dl_fixup(rpnt->next, flag);
 738         tpnt = rpnt->dyn;
 739
 740 #if defined (__SUPPORT_LD_DEBUG__)
 741         if(_dl_debug) _dl_dprintf(_dl_debug_file,"\nrelocation processing: %s", tpnt->libname);
 742 #endif
 743
 744         if (unlikely(tpnt->dynamic_info[UNSUPPORTED_RELOC_TYPE])) {
 745 #if defined (__SUPPORT_LD_DEBUG__)
 746                 if(_dl_debug) {
 747                         _dl_dprintf(2, "%s: can't handle %s relocation records\n",
 748                                         _dl_progname, UNSUPPORTED_RELOC_STR);
 749                 }
 750 #endif
 751                 goof++;
 752                 return goof;
 753         }
 754
 755         if (tpnt->dynamic_info[DT_RELOC_TABLE_ADDR]) {
 756                 if (tpnt->init_flag & RELOCS_DONE)
 757                         return goof;
 758                 tpnt->init_flag |= RELOCS_DONE;
 759                 goof += _dl_parse_relocation_information(rpnt,
 760                                 tpnt->dynamic_info[DT_RELOC_TABLE_ADDR],
 761                                 tpnt->dynamic_info[DT_RELOC_TABLE_SIZE], 0);
 762         }
 763
 764         if (tpnt->dynamic_info[DT_JMPREL]) {
 765                 if (tpnt->init_flag & JMP_RELOCS_DONE)
 766                         return goof;
 767                 tpnt->init_flag |= JMP_RELOCS_DONE;
 768                 if (flag & RTLD_LAZY) {
 769                         _dl_parse_lazy_relocation_information(rpnt,
 770                                         tpnt->dynamic_info[DT_JMPREL],
 771                                         tpnt->dynamic_info [DT_PLTRELSZ], 0);
 772                 } else {
 773                         goof += _dl_parse_relocation_information(rpnt,
 774                                         tpnt->dynamic_info[DT_JMPREL],
 775                                         tpnt->dynamic_info[DT_PLTRELSZ], 0);
 776                 }
 777         }
 778
 779         if (tpnt->init_flag & COPY_RELOCS_DONE)
 780                 return goof;
 781         tpnt->init_flag |= COPY_RELOCS_DONE;
 782         goof += _dl_parse_copy_information(rpnt,
 783                         tpnt->dynamic_info[DT_RELOC_TABLE_ADDR],
 784                         tpnt->dynamic_info[DT_RELOC_TABLE_SIZE], 0);
 785
 786 #if defined (__SUPPORT_LD_DEBUG__)
 787         if(_dl_debug) {
 788                 _dl_dprintf(_dl_debug_file,"\nrelocation processing: %s", tpnt->libname);
 789                 _dl_dprintf(_dl_debug_file,"; finished\n\n");
 790         }
 791 #endif
 792
 793         return goof;
 794 }
 795