elf/dl-open.c

   1 /* Load a shared object at runtime, relocate it, and run its initializer.
   2    Copyright (C) 1996-2007, 2009 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <assert.h>
  21 #include <dlfcn.h>
  22 #include <errno.h>
  23 #include <libintl.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28 #include <sys/mman.h>           /* Check whether MAP_COPY is defined.  */
  29 #include <sys/param.h>
  30 #include <bits/libc-lock.h>
  31 #include <ldsodefs.h>
  32 #include <bp-sym.h>
  33 #include <caller.h>
  34 #include <sysdep-cancel.h>
  35 #include <tls.h>
  36
  37 #include <dl-dst.h>
  38
  39
  40 extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
  41                                     void (*dl_main) (const ElfW(Phdr) *phdr,
  42                                                      ElfW(Word) phnum,
  43                                                      ElfW(Addr) *user_entry));
  44 weak_extern (BP_SYM (_dl_sysdep_start))
  45
  46 extern int __libc_multiple_libcs;       /* Defined in init-first.c.  */
  47
  48 /* Undefine the following for debugging.  */
  49 /* #define SCOPE_DEBUG 1 */
  50 #ifdef SCOPE_DEBUG
  51 static void show_scope (struct link_map *new);
  52 #endif
  53
  54 /* We must be carefull not to leave us in an inconsistent state.  Thus we
  55    catch any error and re-raise it after cleaning up.  */
  56
  57 struct dl_open_args
  58 {
  59   const char *file;
  60   int mode;
  61   /* This is the caller of the dlopen() function.  */
  62   const void *caller_dlopen;
  63   /* This is the caller if _dl_open().  */
  64   const void *caller_dl_open;
  65   struct link_map *map;
  66   /* Namespace ID.  */
  67   Lmid_t nsid;
  68   /* Original parameters to the program and the current environment.  */
  69   int argc;
  70   char **argv;
  71   char **env;
  72 };
  73
  74
  75 static int
  76 add_to_global (struct link_map *new)
  77 {
  78   struct link_map **new_global;
  79   unsigned int to_add = 0;
  80   unsigned int cnt;
  81
  82   /* Count the objects we have to put in the global scope.  */
  83   for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
  84     if (new->l_searchlist.r_list[cnt]->l_global == 0)
  85       ++to_add;
  86
  87   /* The symbols of the new objects and its dependencies are to be
  88      introduced into the global scope that will be used to resolve
  89      references from other dynamically-loaded objects.
  90
  91      The global scope is the searchlist in the main link map.  We
  92      extend this list if necessary.  There is one problem though:
  93      since this structure was allocated very early (before the libc
  94      is loaded) the memory it uses is allocated by the malloc()-stub
  95      in the ld.so.  When we come here these functions are not used
  96      anymore.  Instead the malloc() implementation of the libc is
  97      used.  But this means the block from the main map cannot be used
  98      in an realloc() call.  Therefore we allocate a completely new
  99      array the first time we have to add something to the locale scope.  */
 100
 101   struct link_namespaces *ns = &GL(dl_ns)[new->l_ns];
 102   if (ns->_ns_global_scope_alloc == 0)
 103     {
 104       /* This is the first dynamic object given global scope.  */
 105       ns->_ns_global_scope_alloc
 106         = ns->_ns_main_searchlist->r_nlist + to_add + 8;
 107       new_global = (struct link_map **)
 108         malloc (ns->_ns_global_scope_alloc * sizeof (struct link_map *));
 109       if (new_global == NULL)
 110         {
 111           ns->_ns_global_scope_alloc = 0;
 112         nomem:
 113           _dl_signal_error (ENOMEM, new->l_libname->name, NULL,
 114                             N_("cannot extend global scope"));
 115           return 1;
 116         }
 117
 118       /* Copy over the old entries.  */
 119       ns->_ns_main_searchlist->r_list
 120         = memcpy (new_global, ns->_ns_main_searchlist->r_list,
 121                   (ns->_ns_main_searchlist->r_nlist
 122                    * sizeof (struct link_map *)));
 123     }
 124   else if (ns->_ns_main_searchlist->r_nlist + to_add
 125            > ns->_ns_global_scope_alloc)
 126     {
 127       /* We have to extend the existing array of link maps in the
 128          main map.  */
 129       struct link_map **old_global
 130         = GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list;
 131       size_t new_nalloc = ((ns->_ns_global_scope_alloc + to_add) * 2);
 132
 133       new_global = (struct link_map **)
 134         malloc (new_nalloc * sizeof (struct link_map *));
 135       if (new_global == NULL)
 136         goto nomem;
 137
 138       memcpy (new_global, old_global,
 139               ns->_ns_global_scope_alloc * sizeof (struct link_map *));
 140
 141       ns->_ns_global_scope_alloc = new_nalloc;
 142       ns->_ns_main_searchlist->r_list = new_global;
 143
 144       if (!RTLD_SINGLE_THREAD_P)
 145         THREAD_GSCOPE_WAIT ();
 146
 147       free (old_global);
 148     }
 149
 150   /* Now add the new entries.  */
 151   unsigned int new_nlist = ns->_ns_main_searchlist->r_nlist;
 152   for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
 153     {
 154       struct link_map *map = new->l_searchlist.r_list[cnt];
 155
 156       if (map->l_global == 0)
 157         {
 158           map->l_global = 1;
 159           ns->_ns_main_searchlist->r_list[new_nlist++] = map;
 160         }
 161     }
 162   atomic_write_barrier ();
 163   ns->_ns_main_searchlist->r_nlist = new_nlist;
 164
 165   return 0;
 166 }
 167
 168 int
 169 _dl_scope_free (void *old)
 170 {
 171   struct dl_scope_free_list *fsl;
 172 #define DL_SCOPE_FREE_LIST_SIZE (sizeof (fsl->list) / sizeof (fsl->list[0]))
 173
 174   if (RTLD_SINGLE_THREAD_P)
 175     free (old);
 176   else if ((fsl = GL(dl_scope_free_list)) == NULL)
 177     {
 178       GL(dl_scope_free_list) = fsl = malloc (sizeof (*fsl));
 179       if (fsl == NULL)
 180         {
 181           THREAD_GSCOPE_WAIT ();
 182           free (old);
 183           return 1;
 184         }
 185       else
 186         {
 187           fsl->list[0] = old;
 188           fsl->count = 1;
 189         }
 190     }
 191   else if (fsl->count < DL_SCOPE_FREE_LIST_SIZE)
 192     fsl->list[fsl->count++] = old;
 193   else
 194     {
 195       THREAD_GSCOPE_WAIT ();
 196       while (fsl->count > 0)
 197         free (fsl->list[--fsl->count]);
 198       return 1;
 199     }
 200   return 0;
 201 }
 202
 203 static void
 204 dl_open_worker (void *a)
 205 {
 206   struct dl_open_args *args = a;
 207   const char *file = args->file;
 208   int mode = args->mode;
 209   struct link_map *call_map = NULL;
 210
 211   /* Check whether _dl_open() has been called from a valid DSO.  */
 212   if (__check_caller (args->caller_dl_open,
 213                       allow_libc|allow_libdl|allow_ldso) != 0)
 214     _dl_signal_error (0, "dlopen", NULL, N_("invalid caller"));
 215
 216   /* Determine the caller's map if necessary.  This is needed in case
 217      we have a DST, when we don't know the namespace ID we have to put
 218      the new object in, or when the file name has no path in which
 219      case we need to look along the RUNPATH/RPATH of the caller.  */
 220   const char *dst = strchr (file, '$');
 221   if (dst != NULL || args->nsid == __LM_ID_CALLER
 222       || strchr (file, '/') == NULL)
 223     {
 224       const void *caller_dlopen = args->caller_dlopen;
 225
 226       /* We have to find out from which object the caller is calling.
 227          By default we assume this is the main application.  */
 228       call_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
 229
 230       struct link_map *l;
 231       for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
 232         for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
 233           if (caller_dlopen >= (const void *) l->l_map_start
 234               && caller_dlopen < (const void *) l->l_map_end
 235               && (l->l_contiguous
 236                   || _dl_addr_inside_object (l, (ElfW(Addr)) caller_dlopen)))
 237             {
 238               assert (ns == l->l_ns);
 239               call_map = l;
 240               goto found_caller;
 241             }
 242
 243     found_caller:
 244       if (args->nsid == __LM_ID_CALLER)
 245         {
 246 #ifndef SHARED
 247           /* In statically linked apps there might be no loaded object.  */
 248           if (call_map == NULL)
 249             args->nsid = LM_ID_BASE;
 250           else
 251 #endif
 252             args->nsid = call_map->l_ns;
 253         }
 254     }
 255
 256   assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);
 257
 258   /* Maybe we have to expand a DST.  */
 259   if (__builtin_expect (dst != NULL, 0))
 260     {
 261       size_t len = strlen (file);
 262
 263       /* Determine how much space we need.  We have to allocate the
 264          memory locally.  */
 265       size_t required = DL_DST_REQUIRED (call_map, file, len,
 266                                          _dl_dst_count (dst, 0));
 267
 268       /* Get space for the new file name.  */
 269       char *new_file = (char *) alloca (required + 1);
 270
 271       /* Generate the new file name.  */
 272       _dl_dst_substitute (call_map, file, new_file, 0);
 273
 274       /* If the substitution failed don't try to load.  */
 275       if (*new_file == '\0')
 276         _dl_signal_error (0, "dlopen", NULL,
 277                           N_("empty dynamic string token substitution"));
 278
 279       /* Now we have a new file name.  */
 280       file = new_file;
 281
 282       /* It does not matter whether call_map is set even if we
 283          computed it only because of the DST.  Since the path contains
 284          a slash the value is not used.  See dl-load.c.  */
 285     }
 286
 287   /* Load the named object.  */
 288   struct link_map *new;
 289   args->map = new = _dl_map_object (call_map, file, 0, lt_loaded, 0,
 290                                     mode | __RTLD_CALLMAP, args->nsid);
 291
 292   /* If the pointer returned is NULL this means the RTLD_NOLOAD flag is
 293      set and the object is not already loaded.  */
 294   if (new == NULL)
 295     {
 296       assert (mode & RTLD_NOLOAD);
 297       return;
 298     }
 299
 300   if (__builtin_expect (mode & __RTLD_SPROF, 0))
 301     /* This happens only if we load a DSO for 'sprof'.  */
 302     return;
 303
 304   /* This object is directly loaded.  */
 305   ++new->l_direct_opencount;
 306
 307   /* It was already open.  */
 308   if (__builtin_expect (new->l_searchlist.r_list != NULL, 0))
 309     {
 310       /* Let the user know about the opencount.  */
 311       if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
 312         _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
 313                           new->l_name, new->l_ns, new->l_direct_opencount);
 314
 315       /* If the user requested the object to be in the global namespace
 316          but it is not so far, add it now.  */
 317       if ((mode & RTLD_GLOBAL) && new->l_global == 0)
 318         (void) add_to_global (new);
 319
 320       assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);
 321
 322       return;
 323     }
 324
 325   /* Load that object's dependencies.  */
 326   _dl_map_object_deps (new, NULL, 0, 0,
 327                        mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));
 328
 329   /* So far, so good.  Now check the versions.  */
 330   for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
 331     if (new->l_searchlist.r_list[i]->l_real->l_versions == NULL)
 332       (void) _dl_check_map_versions (new->l_searchlist.r_list[i]->l_real,
 333                                      0, 0);
 334
 335 #ifdef SCOPE_DEBUG
 336   show_scope (new);
 337 #endif
 338
 339 #ifdef SHARED
 340   /* Auditing checkpoint: we have added all objects.  */
 341   if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
 342     {
 343       struct link_map *head = GL(dl_ns)[new->l_ns]._ns_loaded;
 344       /* Do not call the functions for any auditing object.  */
 345       if (head->l_auditing == 0)
 346         {
 347           struct audit_ifaces *afct = GLRO(dl_audit);
 348           for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
 349             {
 350               if (afct->activity != NULL)
 351                 afct->activity (&head->l_audit[cnt].cookie, LA_ACT_CONSISTENT);
 352
 353               afct = afct->next;
 354             }
 355         }
 356     }
 357 #endif
 358
 359   /* Notify the debugger all new objects are now ready to go.  */
 360   struct r_debug *r = _dl_debug_initialize (0, args->nsid);
 361   r->r_state = RT_CONSISTENT;
 362   _dl_debug_state ();
 363
 364   /* Only do lazy relocation if `LD_BIND_NOW' is not set.  */
 365   int reloc_mode = mode & __RTLD_AUDIT;
 366   if (GLRO(dl_lazy))
 367     reloc_mode |= mode & RTLD_LAZY;
 368
 369   /* Relocate the objects loaded.  We do this in reverse order so that copy
 370      relocs of earlier objects overwrite the data written by later objects.  */
 371
 372   struct link_map *l = new;
 373   while (l->l_next)
 374     l = l->l_next;
 375   while (1)
 376     {
 377       if (! l->l_real->l_relocated)
 378         {
 379 #ifdef SHARED
 380           if (__builtin_expect (GLRO(dl_profile) != NULL, 0))
 381             {
 382               /* If this here is the shared object which we want to profile
 383                  make sure the profile is started.  We can find out whether
 384                  this is necessary or not by observing the `_dl_profile_map'
 385                  variable.  If was NULL but is not NULL afterwars we must
 386                  start the profiling.  */
 387               struct link_map *old_profile_map = GL(dl_profile_map);
 388
 389               _dl_relocate_object (l, l->l_scope, reloc_mode | RTLD_LAZY, 1);
 390
 391               if (old_profile_map == NULL && GL(dl_profile_map) != NULL)
 392                 {
 393                   /* We must prepare the profiling.  */
 394                   _dl_start_profile ();
 395
 396                   /* Prevent unloading the object.  */
 397                   GL(dl_profile_map)->l_flags_1 |= DF_1_NODELETE;
 398                 }
 399             }
 400           else
 401 #endif
 402             _dl_relocate_object (l, l->l_scope, reloc_mode, 0);
 403         }
 404
 405       if (l == new)
 406         break;
 407       l = l->l_prev;
 408     }
 409
 410   /* If the file is not loaded now as a dependency, add the search
 411      list of the newly loaded object to the scope.  */
 412   bool any_tls = false;
 413   for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
 414     {
 415       struct link_map *imap = new->l_searchlist.r_list[i];
 416
 417       /* If the initializer has been called already, the object has
 418          not been loaded here and now.  */
 419       if (imap->l_init_called && imap->l_type == lt_loaded)
 420         {
 421           struct r_scope_elem **runp = imap->l_scope;
 422           size_t cnt = 0;
 423
 424           while (*runp != NULL)
 425             {
 426               if (*runp == &new->l_searchlist)
 427                 break;
 428               ++cnt;
 429               ++runp;
 430             }
 431
 432           if (*runp != NULL)
 433             /* Avoid duplicates.  */
 434             continue;
 435
 436           if (__builtin_expect (cnt + 1 >= imap->l_scope_max, 0))
 437             {
 438               /* The 'r_scope' array is too small.  Allocate a new one
 439                  dynamically.  */
 440               size_t new_size;
 441               struct r_scope_elem **newp;
 442
 443 #define SCOPE_ELEMS(imap) \
 444   (sizeof (imap->l_scope_mem) / sizeof (imap->l_scope_mem[0]))
 445
 446               if (imap->l_scope != imap->l_scope_mem
 447                   && imap->l_scope_max < SCOPE_ELEMS (imap))
 448                 {
 449                   new_size = SCOPE_ELEMS (imap);
 450                   newp = imap->l_scope_mem;
 451                 }
 452               else
 453                 {
 454                   new_size = imap->l_scope_max * 2;
 455                   newp = (struct r_scope_elem **)
 456                     malloc (new_size * sizeof (struct r_scope_elem *));
 457                   if (newp == NULL)
 458                     _dl_signal_error (ENOMEM, "dlopen", NULL,
 459                                       N_("cannot create scope list"));
 460                 }
 461
 462               memcpy (newp, imap->l_scope, cnt * sizeof (imap->l_scope[0]));
 463               struct r_scope_elem **old = imap->l_scope;
 464
 465               imap->l_scope = newp;
 466
 467               if (old != imap->l_scope_mem)
 468                 _dl_scope_free (old);
 469
 470               imap->l_scope_max = new_size;
 471             }
 472
 473           /* First terminate the extended list.  Otherwise a thread
 474              might use the new last element and then use the garbage
 475              at offset IDX+1.  */
 476           imap->l_scope[cnt + 1] = NULL;
 477           atomic_write_barrier ();
 478           imap->l_scope[cnt] = &new->l_searchlist;
 479         }
 480       /* Only add TLS memory if this object is loaded now and
 481          therefore is not yet initialized.  */
 482       else if (! imap->l_init_called
 483                /* Only if the module defines thread local data.  */
 484                && __builtin_expect (imap->l_tls_blocksize > 0, 0))
 485         {
 486           /* Now that we know the object is loaded successfully add
 487              modules containing TLS data to the slot info table.  We
 488              might have to increase its size.  */
 489           _dl_add_to_slotinfo (imap);
 490
 491           if (imap->l_need_tls_init)
 492             {
 493               /* For static TLS we have to allocate the memory here
 494                  and now.  This includes allocating memory in the DTV.
 495                  But we cannot change any DTV other than our own. So,
 496                  if we cannot guarantee that there is room in the DTV
 497                  we don't even try it and fail the load.
 498
 499                  XXX We could track the minimum DTV slots allocated in
 500                  all threads.  */
 501               if (! RTLD_SINGLE_THREAD_P && imap->l_tls_modid > DTV_SURPLUS)
 502                 _dl_signal_error (0, "dlopen", NULL, N_("\
 503 cannot load any more object with static TLS"));
 504
 505               imap->l_need_tls_init = 0;
 506 #ifdef SHARED
 507               /* Update the slot information data for at least the
 508                  generation of the DSO we are allocating data for.  */
 509               _dl_update_slotinfo (imap->l_tls_modid);
 510 #endif
 511
 512               GL(dl_init_static_tls) (imap);
 513               assert (imap->l_need_tls_init == 0);
 514             }
 515
 516           /* We have to bump the generation counter.  */
 517           any_tls = true;
 518         }
 519     }
 520
 521   /* Bump the generation number if necessary.  */
 522   if (any_tls && __builtin_expect (++GL(dl_tls_generation) == 0, 0))
 523     _dl_fatal_printf (N_("\
 524 TLS generation counter wrapped!  Please report this."));
 525
 526   /* Run the initializer functions of new objects.  */
 527   _dl_init (new, args->argc, args->argv, args->env);
 528
 529   /* Now we can make the new map available in the global scope.  */
 530   if (mode & RTLD_GLOBAL)
 531     /* Move the object in the global namespace.  */
 532     if (add_to_global (new) != 0)
 533       /* It failed.  */
 534       return;
 535
 536   /* Mark the object as not deletable if the RTLD_NODELETE flags was
 537      passed.  */
 538   if (__builtin_expect (mode & RTLD_NODELETE, 0))
 539     new->l_flags_1 |= DF_1_NODELETE;
 540
 541 #ifndef SHARED
 542   /* We must be the static _dl_open in libc.a.  A static program that
 543      has loaded a dynamic object now has competition.  */
 544   __libc_multiple_libcs = 1;
 545 #endif
 546
 547   /* Let the user know about the opencount.  */
 548   if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
 549     _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
 550                       new->l_name, new->l_ns, new->l_direct_opencount);
 551 }
 552
 553
 554 void *
 555 _dl_open (const char *file, int mode, const void *caller_dlopen, Lmid_t nsid,
 556           int argc, char *argv[], char *env[])
 557 {
 558   if ((mode & RTLD_BINDING_MASK) == 0)
 559     /* One of the flags must be set.  */
 560     _dl_signal_error (EINVAL, file, NULL, N_("invalid mode for dlopen()"));
 561
 562   /* Make sure we are alone.  */
 563   __rtld_lock_lock_recursive (GL(dl_load_lock));
 564
 565   if (__builtin_expect (nsid == LM_ID_NEWLM, 0))
 566     {
 567       /* Find a new namespace.  */
 568       for (nsid = 1; nsid < GL(dl_nns); ++nsid)
 569         if (GL(dl_ns)[nsid]._ns_loaded == NULL)
 570           break;
 571
 572       if (nsid == DL_NNS)
 573         {
 574           /* No more namespace available.  */
 575           __rtld_lock_unlock_recursive (GL(dl_load_lock));
 576
 577           _dl_signal_error (EINVAL, file, NULL, N_("\
 578 no more namespaces available for dlmopen()"));
 579         }
 580
 581       if (nsid == GL(dl_nns))
 582         ++GL(dl_nns);
 583
 584       _dl_debug_initialize (0, nsid)->r_state = RT_CONSISTENT;
 585     }
 586   /* Never allow loading a DSO in a namespace which is empty.  Such
 587      direct placements is only causing problems.  Also don't allow
 588      loading into a namespace used for auditing.  */
 589   else if (__builtin_expect (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER, 0)
 590            && (GL(dl_ns)[nsid]._ns_nloaded == 0
 591                || GL(dl_ns)[nsid]._ns_loaded->l_auditing))
 592     _dl_signal_error (EINVAL, file, NULL,
 593                       N_("invalid target namespace in dlmopen()"));
 594 #ifndef SHARED
 595   else if ((nsid == LM_ID_BASE || nsid == __LM_ID_CALLER)
 596            && GL(dl_ns)[LM_ID_BASE]._ns_loaded == NULL
 597            && GL(dl_nns) == 0)
 598     GL(dl_nns) = 1;
 599 #endif
 600
 601   struct dl_open_args args;
 602   args.file = file;
 603   args.mode = mode;
 604   args.caller_dlopen = caller_dlopen;
 605   args.caller_dl_open = RETURN_ADDRESS (0);
 606   args.map = NULL;
 607   args.nsid = nsid;
 608   args.argc = argc;
 609   args.argv = argv;
 610   args.env = env;
 611
 612   const char *objname;
 613   const char *errstring;
 614   bool malloced;
 615   int errcode = _dl_catch_error (&objname, &errstring, &malloced,
 616                                  dl_open_worker, &args);
 617
 618 #ifndef MAP_COPY
 619   /* We must munmap() the cache file.  */
 620   _dl_unload_cache ();
 621 #endif
 622
 623   /* See if an error occurred during loading.  */
 624   if (__builtin_expect (errstring != NULL, 0))
 625     {
 626       /* Remove the object from memory.  It may be in an inconsistent
 627          state if relocation failed, for example.  */
 628       if (args.map)
 629         {
 630           /* Maybe some of the modules which were loaded use TLS.
 631              Since it will be removed in the following _dl_close call
 632              we have to mark the dtv array as having gaps to fill the
 633              holes.  This is a pessimistic assumption which won't hurt
 634              if not true.  There is no need to do this when we are
 635              loading the auditing DSOs since TLS has not yet been set
 636              up.  */
 637           if ((mode & __RTLD_AUDIT) == 0)
 638             GL(dl_tls_dtv_gaps) = true;
 639
 640           _dl_close_worker (args.map);
 641         }
 642
 643       assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
 644
 645       /* Release the lock.  */
 646       __rtld_lock_unlock_recursive (GL(dl_load_lock));
 647
 648       /* Make a local copy of the error string so that we can release the
 649          memory allocated for it.  */
 650       size_t len_errstring = strlen (errstring) + 1;
 651       char *local_errstring;
 652       if (objname == errstring + len_errstring)
 653         {
 654           size_t total_len = len_errstring + strlen (objname) + 1;
 655           local_errstring = alloca (total_len);
 656           memcpy (local_errstring, errstring, total_len);
 657           objname = local_errstring + len_errstring;
 658         }
 659       else
 660         {
 661           local_errstring = alloca (len_errstring);
 662           memcpy (local_errstring, errstring, len_errstring);
 663         }
 664
 665       if (malloced)
 666         free ((char *) errstring);
 667
 668       /* Reraise the error.  */
 669       _dl_signal_error (errcode, objname, NULL, local_errstring);
 670     }
 671
 672   assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);
 673
 674   /* Release the lock.  */
 675   __rtld_lock_unlock_recursive (GL(dl_load_lock));
 676
 677 #ifndef SHARED
 678   DL_STATIC_INIT (args.map);
 679 #endif
 680
 681   return args.map;
 682 }
 683
 684
 685 #ifdef SCOPE_DEBUG
 686 #include <unistd.h>
 687
 688 static void
 689 show_scope (struct link_map *new)
 690 {
 691   int scope_cnt;
 692
 693   for (scope_cnt = 0; new->l_scope[scope_cnt] != NULL; ++scope_cnt)
 694     {
 695       char numbuf[2];
 696       unsigned int cnt;
 697
 698       numbuf[0] = '0' + scope_cnt;
 699       numbuf[1] = '\0';
 700       _dl_printf ("scope %s:", numbuf);
 701
 702       for (cnt = 0; cnt < new->l_scope[scope_cnt]->r_nlist; ++cnt)
 703         if (*new->l_scope[scope_cnt]->r_list[cnt]->l_name)
 704           _dl_printf (" %s", new->l_scope[scope_cnt]->r_list[cnt]->l_name);
 705         else
 706           _dl_printf (" <main>");
 707
 708       _dl_printf ("\n");
 709     }
 710 }
 711 #endif
 712
 713 #ifdef IS_IN_rtld
 714 /* Return non-zero if ADDR lies within one of L's segments.  */
 715 int
 716 internal_function
 717 _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
 718 {
 719   int n = l->l_phnum;
 720   const ElfW(Addr) reladdr = addr - l->l_addr;
 721
 722   while (--n >= 0)
 723     if (l->l_phdr[n].p_type == PT_LOAD
 724         && reladdr - l->l_phdr[n].p_vaddr >= 0
 725         && reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
 726       return 1;
 727   return 0;
 728 }
 729 #endif