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