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         int i, count = 1;
 143         char *path, *path_n;
 144         char mylibname[2050];
 145         struct elf_resolve *tpnt1;
 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
 158         /* Unlike ldd.c, don't bother to eliminate double //s */
 159
 160
 161         /* Replace colons with zeros in path_list and count them */
 162         for(i=_dl_strlen(path); i > 0; i--) {
 163                 if (path[i]==':') {
 164                         path[i]=0;
 165                         count++;
 166                 }
 167         }
 168
 169         path_n = path;
 170         for (i = 0; i < count; i++) {
 171                 _dl_strcpy(mylibname, path_n);
 172                 _dl_strcat(mylibname, "/");
 173                 _dl_strcat(mylibname, name);
 174                 if ((tpnt1 = _dl_load_elf_shared_library(secure, rpnt, mylibname)) != NULL)
 175                 {
 176                         return tpnt1;
 177                 }
 178                 path_n += (_dl_strlen(path_n) + 1);
 179         }
 180         return NULL;
 181 }
 182
 183 /* Check if the named library is already loaded... */
 184 struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname,
 185                 int trace_loaded_objects)
 186 {
 187         const char *pnt, *pnt1;
 188         struct elf_resolve *tpnt1;
 189         const char *libname, *libname2;
 190         static const char libc[] = "libc.so.";
 191         static const char aborted_wrong_lib[] = "%s: aborted attempt to load %s!\n";
 192
 193         pnt = libname = full_libname;
 194
 195 #if defined (__SUPPORT_LD_DEBUG__)
 196         if(_dl_debug)
 197                 _dl_dprintf(_dl_debug_file, "Checking if '%s' is already loaded\n", full_libname);
 198 #endif
 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 #if 0
 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                 return tpnt1;
 282 #endif
 283
 284 #if defined (__SUPPORT_LD_DEBUG__)
 285         if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tfind library='%s'; searching\n", libname);
 286 #endif
 287         /* If the filename has any '/', try it straight and leave it at that.
 288            For IBCS2 compatibility under linux, we substitute the string
 289            /usr/i486-sysv4/lib for /usr/lib in library names. */
 290
 291         if (libname != full_libname) {
 292 #if defined (__SUPPORT_LD_DEBUG__)
 293                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\ttrying file='%s'\n", full_libname);
 294 #endif
 295                 tpnt1 = _dl_load_elf_shared_library(secure, rpnt, full_libname);
 296                 if (tpnt1) {
 297                         return tpnt1;
 298                 }
 299                 //goto goof;
 300         }
 301
 302         /*
 303          * The ABI specifies that RPATH is searched before LD_*_PATH or
 304          * the default path of /usr/lib.  Check in rpath directories.
 305          */
 306         for (tpnt = _dl_loaded_modules; tpnt; tpnt = tpnt->next) {
 307                 if (tpnt->libtype == elf_executable) {
 308                         pnt = (char *) tpnt->dynamic_info[DT_RPATH];
 309                         if (pnt) {
 310                                 pnt += (unsigned long) tpnt->dynamic_info[DT_STRTAB];
 311 #if defined (__SUPPORT_LD_DEBUG__)
 312                                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching RPATH='%s'\n", pnt);
 313 #endif
 314                                 if ((tpnt1 = search_for_named_library(libname, secure, pnt, rpnt)) != NULL)
 315                                 {
 316                                         return tpnt1;
 317                                 }
 318                         }
 319                 }
 320         }
 321
 322         /* Check in LD_{ELF_}LIBRARY_PATH, if specified and allowed */
 323         if (_dl_library_path) {
 324 #if defined (__SUPPORT_LD_DEBUG__)
 325                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching LD_LIBRARY_PATH='%s'\n", _dl_library_path);
 326 #endif
 327                 if ((tpnt1 = search_for_named_library(libname, secure, _dl_library_path, rpnt)) != NULL)
 328                 {
 329                         return tpnt1;
 330                 }
 331         }
 332
 333         /*
 334          * Where should the cache be searched?  There is no such concept in the
 335          * ABI, so we have some flexibility here.  For now, search it before
 336          * the hard coded paths that follow (i.e before /lib and /usr/lib).
 337          */
 338 #ifdef __LDSO_CACHE_SUPPORT__
 339         if (_dl_cache_addr != NULL && _dl_cache_addr != (caddr_t) - 1) {
 340                 int i;
 341                 header_t *header = (header_t *) _dl_cache_addr;
 342                 libentry_t *libent = (libentry_t *) & header[1];
 343                 char *strs = (char *) &libent[header->nlibs];
 344
 345 #if defined (__SUPPORT_LD_DEBUG__)
 346                 if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching cache='%s'\n", LDSO_CACHE);
 347 #endif
 348                 for (i = 0; i < header->nlibs; i++) {
 349                         if ((libent[i].flags == LIB_ELF ||
 350                                                 libent[i].flags == LIB_ELF_LIBC0 ||
 351                                                 libent[i].flags == LIB_ELF_LIBC5) &&
 352                                         _dl_strcmp(libname, strs + libent[i].sooffset) == 0 &&
 353                                         (tpnt1 = _dl_load_elf_shared_library(secure,
 354                                                                                                                  rpnt, strs + libent[i].liboffset)))
 355                                 return tpnt1;
 356                 }
 357         }
 358 #endif
 359
 360         /* Look for libraries wherever the shared library loader
 361          * was installed */
 362 #if defined (__SUPPORT_LD_DEBUG__)
 363         if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching ldso dir='%s'\n", _dl_ldsopath);
 364 #endif
 365         if ((tpnt1 = search_for_named_library(libname, secure, _dl_ldsopath, rpnt)) != NULL)
 366         {
 367                 return tpnt1;
 368         }
 369
 370
 371         /* Lastly, search the standard list of paths for the library.
 372            This list must exactly match the list in uClibc/ldso/util/ldd.c */
 373 #if defined (__SUPPORT_LD_DEBUG__)
 374         if(_dl_debug) _dl_dprintf(_dl_debug_file, "\tsearching full lib path list\n");
 375 #endif
 376         if ((tpnt1 = search_for_named_library(libname, secure,
 377                                         UCLIBC_RUNTIME_PREFIX "lib:"
 378                                         UCLIBC_RUNTIME_PREFIX "usr/lib"
 379 #ifndef __LDSO_CACHE_SUPPORT__
 380                                         ":" UCLIBC_RUNTIME_PREFIX "usr/X11R6/lib"
 381 #endif
 382                                         , rpnt)
 383                 ) != NULL)
 384         {
 385                 return tpnt1;
 386         }
 387
 388 goof:
 389         /* Well, we shot our wad on that one.  All we can do now is punt */
 390         if (_dl_internal_error_number)
 391                 _dl_error_number = _dl_internal_error_number;
 392         else
 393                 _dl_error_number = LD_ERROR_NOFILE;
 394 #if defined (__SUPPORT_LD_DEBUG__)
 395         if(_dl_debug) _dl_dprintf(2, "Bummer: could not find '%s'!\n", libname);
 396 #endif
 397         return NULL;
 398 }
 399
 400
 401 /*
 402  * Read one ELF library into memory, mmap it into the correct locations and
 403  * add the symbol info to the symbol chain.  Perform any relocations that
 404  * are required.
 405  */
 406
 407 struct elf_resolve *_dl_load_elf_shared_library(int secure,
 408         struct dyn_elf **rpnt, char *libname)
 409 {
 410         ElfW(Ehdr) *epnt;
 411         unsigned long dynamic_addr = 0;
 412         Elf32_Dyn *dpnt;
 413         struct elf_resolve *tpnt;
 414         ElfW(Phdr) *ppnt;
 415         char *status, *header;
 416         unsigned long dynamic_info[DYNAMIC_SIZE];
 417         unsigned long *lpnt;
 418         unsigned long libaddr;
 419         unsigned long minvma = 0xffffffff, maxvma = 0;
 420         int i, flags, piclib, infile;
 421         ElfW(Addr) relro_addr = 0;
 422         size_t relro_size = 0;
 423
 424         /* If this file is already loaded, skip this step */
 425         tpnt = _dl_check_hashed_files(libname);
 426         if (tpnt) {
 427                 if (*rpnt) {
 428                         (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
 429                         _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
 430                         (*rpnt)->next->prev = (*rpnt);
 431                         *rpnt = (*rpnt)->next;
 432                         (*rpnt)->dyn = tpnt;
 433                         tpnt->symbol_scope = _dl_symbol_tables;
 434                 }
 435                 tpnt->usage_count++;
 436                 tpnt->libtype = elf_lib;
 437 #if defined (__SUPPORT_LD_DEBUG__)
 438                 if(_dl_debug) _dl_dprintf(2, "file='%s';  already loaded\n", libname);
 439 #endif
 440                 return tpnt;
 441         }
 442
 443         /* If we are in secure mode (i.e. a setu/gid binary using LD_PRELOAD),
 444            we don't load the library if it isn't setuid. */
 445
 446         if (secure) {
 447                 struct stat st;
 448
 449                 if (_dl_stat(libname, &st) || !(st.st_mode & S_ISUID))
 450                         return NULL;
 451         }
 452
 453         libaddr = 0;
 454         infile = _dl_open(libname, O_RDONLY, 0);
 455         if (infile < 0) {
 456 #if 0
 457                 /*
 458                  * NO!  When we open shared libraries we may search several paths.
 459                  * it is inappropriate to generate an error here.
 460                  */
 461                 _dl_dprintf(2, "%s: can't open '%s'\n", _dl_progname, libname);
 462 #endif
 463                 _dl_internal_error_number = LD_ERROR_NOFILE;
 464                 return NULL;
 465         }
 466
 467         header = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
 468                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 469         if (_dl_mmap_check_error(header)) {
 470                 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
 471                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 472                 _dl_close(infile);
 473                 return NULL;
 474         };
 475
 476         _dl_read(infile, header, _dl_pagesize);
 477         epnt = (ElfW(Ehdr) *) (intptr_t) header;
 478         if (epnt->e_ident[0] != 0x7f ||
 479                         epnt->e_ident[1] != 'E' ||
 480                         epnt->e_ident[2] != 'L' ||
 481                         epnt->e_ident[3] != 'F')
 482         {
 483                 _dl_dprintf(2, "%s: '%s' is not an ELF file\n", _dl_progname,
 484                                 libname);
 485                 _dl_internal_error_number = LD_ERROR_NOTELF;
 486                 _dl_close(infile);
 487                 _dl_munmap(header, _dl_pagesize);
 488                 return NULL;
 489         };
 490
 491         if ((epnt->e_type != ET_DYN) || (epnt->e_machine != MAGIC1
 492 #ifdef MAGIC2
 493                                 && epnt->e_machine != MAGIC2
 494 #endif
 495                                 ))
 496         {
 497                 _dl_internal_error_number =
 498                         (epnt->e_type != ET_DYN ? LD_ERROR_NOTDYN : LD_ERROR_NOTMAGIC);
 499                 _dl_dprintf(2, "%s: '%s' is not an ELF executable for " ELF_TARGET
 500                                 "\n", _dl_progname, libname);
 501                 _dl_close(infile);
 502                 _dl_munmap(header, _dl_pagesize);
 503                 return NULL;
 504         };
 505
 506         ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 507
 508         piclib = 1;
 509         for (i = 0; i < epnt->e_phnum; i++) {
 510
 511                 if (ppnt->p_type == PT_DYNAMIC) {
 512                         if (dynamic_addr)
 513                                 _dl_dprintf(2, "%s: '%s' has more than one dynamic section\n",
 514                                                 _dl_progname, libname);
 515                         dynamic_addr = ppnt->p_vaddr;
 516                 };
 517
 518                 if (ppnt->p_type == PT_LOAD) {
 519                         /* See if this is a PIC library. */
 520                         if (i == 0 && ppnt->p_vaddr > 0x1000000) {
 521                                 piclib = 0;
 522                                 minvma = ppnt->p_vaddr;
 523                         }
 524                         if (piclib && ppnt->p_vaddr < minvma) {
 525                                 minvma = ppnt->p_vaddr;
 526                         }
 527                         if (((unsigned long) ppnt->p_vaddr + ppnt->p_memsz) > maxvma) {
 528                                 maxvma = ppnt->p_vaddr + ppnt->p_memsz;
 529                         }
 530                 }
 531                 ppnt++;
 532         };
 533
 534         maxvma = (maxvma + ADDR_ALIGN) & ~ADDR_ALIGN;
 535         minvma = minvma & ~0xffffU;
 536
 537         flags = MAP_PRIVATE /*| MAP_DENYWRITE */ ;
 538         if (!piclib)
 539                 flags |= MAP_FIXED;
 540
 541         status = (char *) _dl_mmap((char *) (piclib ? 0 : minvma),
 542                         maxvma - minvma, PROT_NONE, flags | MAP_ANONYMOUS, -1, 0);
 543         if (_dl_mmap_check_error(status)) {
 544                 _dl_dprintf(2, "%s: can't map %s\n", _dl_progname, libname);
 545                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 546                 _dl_close(infile);
 547                 _dl_munmap(header, _dl_pagesize);
 548                 return NULL;
 549         };
 550         libaddr = (unsigned long) status;
 551         flags |= MAP_FIXED;
 552
 553         /* Get the memory to store the library */
 554         ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 555
 556         for (i = 0; i < epnt->e_phnum; i++) {
 557                 if (ppnt->p_type == PT_GNU_RELRO) {
 558                         relro_addr = ppnt->p_vaddr;
 559                         relro_size = ppnt->p_memsz;
 560                 }
 561                 if (ppnt->p_type == PT_LOAD) {
 562
 563                         /* See if this is a PIC library. */
 564                         if (i == 0 && ppnt->p_vaddr > 0x1000000) {
 565                                 piclib = 0;
 566                                 /* flags |= MAP_FIXED; */
 567                         }
 568
 569
 570
 571                         if (ppnt->p_flags & PF_W) {
 572                                 unsigned long map_size;
 573                                 char *cpnt;
 574
 575                                 status = (char *) _dl_mmap((char *) ((piclib ? libaddr : 0) +
 576                                                         (ppnt->p_vaddr & PAGE_ALIGN)), (ppnt->p_vaddr & ADDR_ALIGN)
 577                                                 + ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags, infile,
 578                                                 ppnt->p_offset & OFFS_ALIGN);
 579
 580                                 if (_dl_mmap_check_error(status)) {
 581                                         _dl_dprintf(2, "%s: can't map '%s'\n",
 582                                                         _dl_progname, libname);
 583                                         _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 584                                         _dl_munmap((char *) libaddr, maxvma - minvma);
 585                                         _dl_close(infile);
 586                                         _dl_munmap(header, _dl_pagesize);
 587                                         return NULL;
 588                                 };
 589
 590                                 /* Pad the last page with zeroes. */
 591                                 cpnt = (char *) (status + (ppnt->p_vaddr & ADDR_ALIGN) +
 592                                                 ppnt->p_filesz);
 593                                 while (((unsigned long) cpnt) & ADDR_ALIGN)
 594                                         *cpnt++ = 0;
 595
 596                                 /* I am not quite sure if this is completely
 597                                  * correct to do or not, but the basic way that
 598                                  * we handle bss segments is that we mmap
 599                                  * /dev/zero if there are any pages left over
 600                                  * that are not mapped as part of the file */
 601
 602                                 map_size = (ppnt->p_vaddr + ppnt->p_filesz + ADDR_ALIGN) & PAGE_ALIGN;
 603
 604                                 if (map_size < ppnt->p_vaddr + ppnt->p_memsz)
 605                                         status = (char *) _dl_mmap((char *) map_size +
 606                                                         (piclib ? libaddr : 0),
 607                                                         ppnt->p_vaddr + ppnt->p_memsz - map_size,
 608                                                         LXFLAGS(ppnt->p_flags), flags | MAP_ANONYMOUS, -1, 0);
 609                         } else
 610                                 status = (char *) _dl_mmap((char *) (ppnt->p_vaddr & PAGE_ALIGN)
 611                                                 + (piclib ? libaddr : 0), (ppnt->p_vaddr & ADDR_ALIGN) +
 612                                                 ppnt->p_filesz, LXFLAGS(ppnt->p_flags), flags,
 613                                                 infile, ppnt->p_offset & OFFS_ALIGN);
 614                         if (_dl_mmap_check_error(status)) {
 615                                 _dl_dprintf(2, "%s: can't map '%s'\n", _dl_progname, libname);
 616                                 _dl_internal_error_number = LD_ERROR_MMAP_FAILED;
 617                                 _dl_munmap((char *) libaddr, maxvma - minvma);
 618                                 _dl_close(infile);
 619                                 _dl_munmap(header, _dl_pagesize);
 620                                 return NULL;
 621                         };
 622
 623                         /* if(libaddr == 0 && piclib) {
 624                            libaddr = (unsigned long) status;
 625                            flags |= MAP_FIXED;
 626                            }; */
 627                 };
 628                 ppnt++;
 629         };
 630         _dl_close(infile);
 631
 632         /* For a non-PIC library, the addresses are all absolute */
 633         if (piclib) {
 634                 dynamic_addr += (unsigned long) libaddr;
 635         }
 636
 637         /*
 638          * OK, the ELF library is now loaded into VM in the correct locations
 639          * The next step is to go through and do the dynamic linking (if needed).
 640          */
 641
 642         /* Start by scanning the dynamic section to get all of the pointers */
 643
 644         if (!dynamic_addr) {
 645                 _dl_internal_error_number = LD_ERROR_NODYNAMIC;
 646                 _dl_dprintf(2, "%s: '%s' is missing a dynamic section\n",
 647                                 _dl_progname, libname);
 648                 _dl_munmap(header, _dl_pagesize);
 649                 return NULL;
 650         }
 651
 652         dpnt = (Elf32_Dyn *) dynamic_addr;
 653         _dl_memset(dynamic_info, 0, sizeof(dynamic_info));
 654         _dl_parse_dynamic_info(dpnt, dynamic_info, NULL, libaddr);
 655         /* If the TEXTREL is set, this means that we need to make the pages
 656            writable before we perform relocations.  Do this now. They get set
 657            back again later. */
 658
 659         if (dynamic_info[DT_TEXTREL]) {
 660 #ifndef __FORCE_SHAREABLE_TEXT_SEGMENTS__
 661                 ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
 662                 for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
 663                         if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W))
 664                                 _dl_mprotect((void *) ((piclib ? libaddr : 0) +
 665                                                         (ppnt->p_vaddr & PAGE_ALIGN)),
 666                                                 (ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz,
 667                                                 PROT_READ | PROT_WRITE | PROT_EXEC);
 668                 }
 669 #else
 670                 _dl_dprintf(_dl_debug_file, "Can't modify %s's text section. Use GCC option -fPIC for shared objects, please.\n",libname);
 671                 _dl_exit(1);
 672 #endif
 673         }
 674
 675         tpnt = _dl_add_elf_hash_table(libname, (char *) libaddr, dynamic_info,
 676                         dynamic_addr, 0);
 677         tpnt->relro_addr = relro_addr;
 678         tpnt->relro_size = relro_size;
 679         tpnt->ppnt = (ElfW(Phdr) *)(intptr_t) (tpnt->loadaddr + epnt->e_phoff);
 680         tpnt->n_phent = epnt->e_phnum;
 681
 682         /*
 683          * Add this object into the symbol chain
 684          */
 685         if (*rpnt) {
 686                 (*rpnt)->next = (struct dyn_elf *) _dl_malloc(sizeof(struct dyn_elf));
 687                 _dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
 688                 (*rpnt)->next->prev = (*rpnt);
 689                 *rpnt = (*rpnt)->next;
 690                 (*rpnt)->dyn = tpnt;
 691                 tpnt->symbol_scope = _dl_symbol_tables;
 692         }
 693         tpnt->usage_count++;
 694         tpnt->libtype = elf_lib;
 695
 696         /*
 697          * OK, the next thing we need to do is to insert the dynamic linker into
 698          * the proper entry in the GOT so that the PLT symbols can be properly
 699          * resolved.
 700          */
 701
 702         lpnt = (unsigned long *) dynamic_info[DT_PLTGOT];
 703
 704         if (lpnt) {
 705                 lpnt = (unsigned long *) (dynamic_info[DT_PLTGOT]);
 706                 INIT_GOT(lpnt, tpnt);
 707         };
 708
 709 #if defined (__SUPPORT_LD_DEBUG__)
 710         if(_dl_debug) {
 711                 _dl_dprintf(2, "\n\tfile='%s';  generating link map\n", libname);
 712                 _dl_dprintf(2, "\t\tdynamic: %x  base: %x\n",
 713                                 dynamic_addr, libaddr);
 714                 _dl_dprintf(2, "\t\t  entry: %x  phdr: %x  phnum: %x\n\n",
 715                                 epnt->e_entry + libaddr, tpnt->ppnt, tpnt->n_phent);
 716
 717         }
 718 #endif
 719         _dl_munmap(header, _dl_pagesize);
 720
 721         return tpnt;
 722 }
 723 /* now_flag must be RTLD_NOW or zero */
 724 int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
 725 {
 726         int goof = 0;
 727         struct elf_resolve *tpnt;
 728         Elf32_Word reloc_size, reloc_addr, relative_count;
 729
 730         if (rpnt->next)
 731                 goof += _dl_fixup(rpnt->next, now_flag);
 732         tpnt = rpnt->dyn;
 733
 734 #if defined (__SUPPORT_LD_DEBUG__)
 735         if(_dl_debug && !(tpnt->init_flag & RELOCS_DONE))
 736                 _dl_dprintf(_dl_debug_file,"\nrelocation processing: %s\n", tpnt->libname);
 737 #endif
 738
 739         if (unlikely(tpnt->dynamic_info[UNSUPPORTED_RELOC_TYPE])) {
 740 #if defined (__SUPPORT_LD_DEBUG__)
 741                 if(_dl_debug) {
 742                         _dl_dprintf(2, "%s: can't handle %s relocation records\n",
 743                                         _dl_progname, UNSUPPORTED_RELOC_STR);
 744                 }
 745 #endif
 746                 goof++;
 747                 return goof;
 748         }
 749
 750         reloc_size = tpnt->dynamic_info[DT_RELOC_TABLE_SIZE];
 751 /* On some machines, notably SPARC & PPC, DT_REL* includes DT_JMPREL in its
 752    range.  Note that according to the ELF spec, this is completely legal! */
 753 #ifdef ELF_MACHINE_PLTREL_OVERLAP
 754         reloc_size -= tpnt->dynamic_info [DT_PLTRELSZ];
 755 #endif
 756         if (tpnt->dynamic_info[DT_RELOC_TABLE_ADDR] &&
 757             !(tpnt->init_flag & RELOCS_DONE)) {
 758                 tpnt->init_flag |= RELOCS_DONE;
 759                 reloc_addr = tpnt->dynamic_info[DT_RELOC_TABLE_ADDR];
 760                 relative_count = tpnt->dynamic_info[DT_RELCONT_IDX];
 761                 if (relative_count) { /* Optimize the XX_RELATIVE relocations if possible */
 762                         reloc_size -= relative_count * sizeof(ELF_RELOC);
 763                         elf_machine_relative (tpnt->loadaddr, reloc_addr, relative_count);
 764                         reloc_addr += relative_count * sizeof(ELF_RELOC);
 765                 }
 766                 goof += _dl_parse_relocation_information(rpnt,
 767                                 reloc_addr,
 768                                 reloc_size);
 769         }
 770         if (tpnt->dynamic_info[DT_BIND_NOW])
 771                 now_flag = RTLD_NOW;
 772         if (tpnt->dynamic_info[DT_JMPREL] &&
 773             (!(tpnt->init_flag & JMP_RELOCS_DONE) ||
 774              (now_flag && !(tpnt->rtld_flags & now_flag)))) {
 775                 tpnt->rtld_flags |= now_flag;
 776                 tpnt->init_flag |= JMP_RELOCS_DONE;
 777                 if (!(tpnt->rtld_flags & RTLD_NOW)) {
 778                         _dl_parse_lazy_relocation_information(rpnt,
 779                                         tpnt->dynamic_info[DT_JMPREL],
 780                                         tpnt->dynamic_info [DT_PLTRELSZ]);
 781                 } else {
 782                         goof += _dl_parse_relocation_information(rpnt,
 783                                         tpnt->dynamic_info[DT_JMPREL],
 784                                         tpnt->dynamic_info[DT_PLTRELSZ]);
 785                 }
 786         }
 787         return goof;
 788 }
 789
 790 /* Minimal printf which handles only %s, %d, and %x */
 791 void _dl_dprintf(int fd, const char *fmt, ...)
 792 {
 793         int num;
 794         va_list args;
 795         char *start, *ptr, *string;
 796         static char *buf;
 797
 798         buf = _dl_mmap((void *) 0, _dl_pagesize, PROT_READ | PROT_WRITE,
 799                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 800         if (_dl_mmap_check_error(buf)) {
 801                 _dl_write(fd, "mmap of a spare page failed!\n", 29);
 802                 _dl_exit(20);
 803         }
 804
 805         start = ptr = buf;
 806
 807         if (!fmt)
 808                 return;
 809
 810         if (_dl_strlen(fmt) >= (_dl_pagesize - 1)) {
 811                 _dl_write(fd, "overflow\n", 11);
 812                 _dl_exit(20);
 813         }
 814
 815         _dl_strcpy(buf, fmt);
 816         va_start(args, fmt);
 817
 818         while (start) {
 819                 while (*ptr != '%' && *ptr) {
 820                         ptr++;
 821                 }
 822
 823                 if (*ptr == '%') {
 824                         *ptr++ = '\0';
 825                         _dl_write(fd, start, _dl_strlen(start));
 826
 827                         switch (*ptr++) {
 828                                 case 's':
 829                                         string = va_arg(args, char *);
 830
 831                                         if (!string)
 832                                                 _dl_write(fd, "(null)", 6);
 833                                         else
 834                                                 _dl_write(fd, string, _dl_strlen(string));
 835                                         break;
 836
 837                                 case 'i':
 838                                 case 'd':
 839                                         {
 840                                                 char tmp[22];
 841                                                 num = va_arg(args, int);
 842
 843                                                 string = _dl_simple_ltoa(tmp, num);
 844                                                 _dl_write(fd, string, _dl_strlen(string));
 845                                                 break;
 846                                         }
 847                                 case 'x':
 848                                 case 'X':
 849                                         {
 850                                                 char tmp[22];
 851                                                 num = va_arg(args, int);
 852
 853                                                 string = _dl_simple_ltoahex(tmp, num);
 854                                                 _dl_write(fd, string, _dl_strlen(string));
 855                                                 break;
 856                                         }
 857                                 default:
 858                                         _dl_write(fd, "(null)", 6);
 859                                         break;
 860                         }
 861
 862                         start = ptr;
 863                 } else {
 864                         _dl_write(fd, start, _dl_strlen(start));
 865                         start = NULL;
 866                 }
 867         }
 868         _dl_munmap(buf, _dl_pagesize);
 869         return;
 870 }
 871
 872 char *_dl_strdup(const char *string)
 873 {
 874         char *retval;
 875         int len;
 876
 877         len = _dl_strlen(string);
 878         retval = _dl_malloc(len + 1);
 879         _dl_strcpy(retval, string);
 880         return retval;
 881 }
 882
 883 void _dl_parse_dynamic_info(Elf32_Dyn *dpnt, unsigned long dynamic_info[], void *debug_addr, Elf32_Addr load_off)
 884 {
 885         __dl_parse_dynamic_info(dpnt, dynamic_info, debug_addr, load_off);
 886 }
 887 #ifdef __USE_GNU
 888 #if ! defined LIBDL || (! defined PIC && ! defined __PIC__)
 889 int
 890 __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, size_t size, void *data), void *data)
 891 {
 892         struct elf_resolve *l;
 893         struct dl_phdr_info info;
 894         int ret = 0;
 895
 896         for (l = _dl_loaded_modules; l != NULL; l = l->next) {
 897                 info.dlpi_addr = l->loadaddr;
 898                 info.dlpi_name = l->libname;
 899                 info.dlpi_phdr = l->ppnt;
 900                 info.dlpi_phnum = l->n_phent;
 901                 ret = callback (&info, sizeof (struct dl_phdr_info), data);
 902                 if (ret)
 903                         break;
 904         }
 905         return ret;
 906 }
 907 strong_alias(__dl_iterate_phdr, dl_iterate_phdr);
 908 #endif
 909 #endif