aboutsummaryrefslogtreecommitdiff
path: root/elf/dl-open.c
blob: 9c39a34a4b0baafd93f37b1364c10724b0fa6d9b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
/* Load a shared object at runtime, relocate it, and run its initializer.
   Copyright (C) 1996-2012 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <assert.h>
#include <dlfcn.h>
#include <errno.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>		/* Check whether MAP_COPY is defined.  */
#include <sys/param.h>
#include <bits/libc-lock.h>
#include <ldsodefs.h>
#include <bp-sym.h>
#include <caller.h>
#include <sysdep-cancel.h>
#include <tls.h>
#include <stap-probe.h>
#include <atomic.h>

#include <dl-dst.h>


extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
				    void (*dl_main) (const ElfW(Phdr) *phdr,
						     ElfW(Word) phnum,
						     ElfW(Addr) *user_entry,
						     ElfW(auxv_t) *auxv));
weak_extern (BP_SYM (_dl_sysdep_start))

extern int __libc_multiple_libcs;	/* Defined in init-first.c.  */

/* We must be careful not to leave us in an inconsistent state.  Thus we
   catch any error and re-raise it after cleaning up.  */

struct dl_open_args
{
  const char *file;
  int mode;
  /* This is the caller of the dlopen() function.  */
  const void *caller_dlopen;
  /* This is the caller of _dl_open().  */
  const void *caller_dl_open;
  struct link_map *map;
  /* Namespace ID.  */
  Lmid_t nsid;
  /* Original parameters to the program and the current environment.  */
  int argc;
  char **argv;
  char **env;
};


static int
add_to_global (struct link_map *new)
{
  struct link_map **new_global;
  unsigned int to_add = 0;
  unsigned int cnt;

  /* Count the objects we have to put in the global scope.  */
  for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
    if (new->l_searchlist.r_list[cnt]->l_global == 0)
      ++to_add;

  /* The symbols of the new objects and its dependencies are to be
     introduced into the global scope that will be used to resolve
     references from other dynamically-loaded objects.

     The global scope is the searchlist in the main link map.  We
     extend this list if necessary.  There is one problem though:
     since this structure was allocated very early (before the libc
     is loaded) the memory it uses is allocated by the malloc()-stub
     in the ld.so.  When we come here these functions are not used
     anymore.  Instead the malloc() implementation of the libc is
     used.  But this means the block from the main map cannot be used
     in an realloc() call.  Therefore we allocate a completely new
     array the first time we have to add something to the locale scope.  */

  struct link_namespaces *ns = &GL(dl_ns)[new->l_ns];
  if (ns->_ns_global_scope_alloc == 0)
    {
      /* This is the first dynamic object given global scope.  */
      ns->_ns_global_scope_alloc
	= ns->_ns_main_searchlist->r_nlist + to_add + 8;
      new_global = (struct link_map **)
	malloc (ns->_ns_global_scope_alloc * sizeof (struct link_map *));
      if (new_global == NULL)
	{
	  ns->_ns_global_scope_alloc = 0;
	nomem:
	  _dl_signal_error (ENOMEM, new->l_libname->name, NULL,
			    N_("cannot extend global scope"));
	  return 1;
	}

      /* Copy over the old entries.  */
      ns->_ns_main_searchlist->r_list
	= memcpy (new_global, ns->_ns_main_searchlist->r_list,
		  (ns->_ns_main_searchlist->r_nlist
		   * sizeof (struct link_map *)));
    }
  else if (ns->_ns_main_searchlist->r_nlist + to_add
	   > ns->_ns_global_scope_alloc)
    {
      /* We have to extend the existing array of link maps in the
	 main map.  */
      struct link_map **old_global
	= GL(dl_ns)[new->l_ns]._ns_main_searchlist->r_list;
      size_t new_nalloc = ((ns->_ns_global_scope_alloc + to_add) * 2);

      new_global = (struct link_map **)
	malloc (new_nalloc * sizeof (struct link_map *));
      if (new_global == NULL)
	goto nomem;

      memcpy (new_global, old_global,
	      ns->_ns_global_scope_alloc * sizeof (struct link_map *));

      ns->_ns_global_scope_alloc = new_nalloc;
      ns->_ns_main_searchlist->r_list = new_global;

      if (!RTLD_SINGLE_THREAD_P)
	THREAD_GSCOPE_WAIT ();

      free (old_global);
    }

  /* Now add the new entries.  */
  unsigned int new_nlist = ns->_ns_main_searchlist->r_nlist;
  for (cnt = 0; cnt < new->l_searchlist.r_nlist; ++cnt)
    {
      struct link_map *map = new->l_searchlist.r_list[cnt];

      if (map->l_global == 0)
	{
	  map->l_global = 1;
	  ns->_ns_main_searchlist->r_list[new_nlist++] = map;

	  /* We modify the global scope.  Report this.  */
	  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES, 0))
	    _dl_debug_printf ("\nadd %s [%lu] to global scope\n",
			      map->l_name, map->l_ns);
	}
    }
  atomic_write_barrier ();
  ns->_ns_main_searchlist->r_nlist = new_nlist;

  return 0;
}

static void
dl_open_worker (void *a)
{
  struct dl_open_args *args = a;
  const char *file = args->file;
  int mode = args->mode;
  struct link_map *call_map = NULL;

  /* Check whether _dl_open() has been called from a valid DSO.  */
  if (__check_caller (args->caller_dl_open,
		      allow_libc|allow_libdl|allow_ldso) != 0)
    _dl_signal_error (0, "dlopen", NULL, N_("invalid caller"));

  /* Determine the caller's map if necessary.  This is needed in case
     we have a DST, when we don't know the namespace ID we have to put
     the new object in, or when the file name has no path in which
     case we need to look along the RUNPATH/RPATH of the caller.  */
  const char *dst = strchr (file, '$');
  if (dst != NULL || args->nsid == __LM_ID_CALLER
      || strchr (file, '/') == NULL)
    {
      const void *caller_dlopen = args->caller_dlopen;

#ifdef SHARED
      /* We have to find out from which object the caller is calling.
	 By default we assume this is the main application.  */
      call_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
#endif

      struct link_map *l;
      for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
	for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
	  if (caller_dlopen >= (const void *) l->l_map_start
	      && caller_dlopen < (const void *) l->l_map_end
	      && (l->l_contiguous
		  || _dl_addr_inside_object (l, (ElfW(Addr)) caller_dlopen)))
	    {
	      assert (ns == l->l_ns);
	      call_map = l;
	      goto found_caller;
	    }

    found_caller:
      if (args->nsid == __LM_ID_CALLER)
	{
#ifndef SHARED
	  /* In statically linked apps there might be no loaded object.  */
	  if (call_map == NULL)
	    args->nsid = LM_ID_BASE;
	  else
#endif
	    args->nsid = call_map->l_ns;
	}
    }

  assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);

  /* Load the named object.  */
  struct link_map *new;
  args->map = new = _dl_map_object (call_map, file, lt_loaded, 0,
				    mode | __RTLD_CALLMAP, args->nsid);

  /* If the pointer returned is NULL this means the RTLD_NOLOAD flag is
     set and the object is not already loaded.  */
  if (new == NULL)
    {
      assert (mode & RTLD_NOLOAD);
      return;
    }

  if (__builtin_expect (mode & __RTLD_SPROF, 0))
    /* This happens only if we load a DSO for 'sprof'.  */
    return;

  /* This object is directly loaded.  */
  ++new->l_direct_opencount;

  /* It was already open.  */
  if (__builtin_expect (new->l_searchlist.r_list != NULL, 0))
    {
      /* Let the user know about the opencount.  */
      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
	_dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
			  new->l_name, new->l_ns, new->l_direct_opencount);

      /* If the user requested the object to be in the global namespace
	 but it is not so far, add it now.  */
      if ((mode & RTLD_GLOBAL) && new->l_global == 0)
	(void) add_to_global (new);

      assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);

      return;
    }

  /* Load that object's dependencies.  */
  _dl_map_object_deps (new, NULL, 0, 0,
		       mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));

  /* So far, so good.  Now check the versions.  */
  for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
    if (new->l_searchlist.r_list[i]->l_real->l_versions == NULL)
      (void) _dl_check_map_versions (new->l_searchlist.r_list[i]->l_real,
				     0, 0);

#ifdef SHARED
  /* Auditing checkpoint: we have added all objects.  */
  if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
    {
      struct link_map *head = GL(dl_ns)[new->l_ns]._ns_loaded;
      /* Do not call the functions for any auditing object.  */
      if (head->l_auditing == 0)
	{
	  struct audit_ifaces *afct = GLRO(dl_audit);
	  for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
	    {
	      if (afct->activity != NULL)
		afct->activity (&head->l_audit[cnt].cookie, LA_ACT_CONSISTENT);

	      afct = afct->next;
	    }
	}
    }
#endif

  /* Notify the debugger all new objects are now ready to go.  */
  struct r_debug *r = _dl_debug_initialize (0, args->nsid);
  r->r_state = RT_CONSISTENT;
  _dl_debug_state ();
  LIBC_PROBE (map_complete, 3, args->nsid, r, new);

  /* Print scope information.  */
  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES, 0))
    _dl_show_scope (new, 0);

  /* Only do lazy relocation if `LD_BIND_NOW' is not set.  */
  int reloc_mode = mode & __RTLD_AUDIT;
  if (GLRO(dl_lazy))
    reloc_mode |= mode & RTLD_LAZY;

  /* Sort the objects by dependency for the relocation process.  This
     allows IFUNC relocations to work and it also means copy
     relocation of dependencies are if necessary overwritten.  */
  size_t nmaps = 0;
  struct link_map *l = new;
  do
    {
      if (! l->l_real->l_relocated)
	++nmaps;
      l = l->l_next;
    }
  while (l != NULL);
  struct link_map *maps[nmaps];
  nmaps = 0;
  l = new;
  do
    {
      if (! l->l_real->l_relocated)
	maps[nmaps++] = l;
      l = l->l_next;
    }
  while (l != NULL);
  if (nmaps > 1)
    {
      uint16_t seen[nmaps];
      memset (seen, '\0', nmaps);
      size_t i = 0;
      while (1)
	{
	  ++seen[i];
	  struct link_map *thisp = maps[i];

	  /* Find the last object in the list for which the current one is
	     a dependency and move the current object behind the object
	     with the dependency.  */
	  size_t k = nmaps - 1;
	  while (k > i)
	    {
	      struct link_map **runp = maps[k]->l_initfini;
	      if (runp != NULL)
		/* Look through the dependencies of the object.  */
		while (*runp != NULL)
		  if (__builtin_expect (*runp++ == thisp, 0))
		    {
		      /* Move the current object to the back past the last
			 object with it as the dependency.  */
		      memmove (&maps[i], &maps[i + 1],
			       (k - i) * sizeof (maps[0]));
		      maps[k] = thisp;

		      if (seen[i + 1] > nmaps - i)
			{
			  ++i;
			  goto next_clear;
			}

		      uint16_t this_seen = seen[i];
		      memmove (&seen[i], &seen[i + 1],
			       (k - i) * sizeof (seen[0]));
		      seen[k] = this_seen;

		      goto next;
		    }

	      --k;
	    }

	  if (++i == nmaps)
	    break;
	next_clear:
	  memset (&seen[i], 0, (nmaps - i) * sizeof (seen[0]));
	next:;
	}
    }

  int relocation_in_progress = 0;

  for (size_t i = nmaps; i-- > 0; )
    {
      l = maps[i];

      if (! relocation_in_progress)
	{
	  /* Notify the debugger that relocations are about to happen.  */
	  LIBC_PROBE (reloc_start, 2, args->nsid, r);
	  relocation_in_progress = 1;
	}

#ifdef SHARED
      if (__builtin_expect (GLRO(dl_profile) != NULL, 0))
	{
	  /* If this here is the shared object which we want to profile
	     make sure the profile is started.  We can find out whether
	     this is necessary or not by observing the `_dl_profile_map'
	     variable.  If it was NULL but is not NULL afterwars we must
	     start the profiling.  */
	  struct link_map *old_profile_map = GL(dl_profile_map);

	  _dl_relocate_object (l, l->l_scope, reloc_mode | RTLD_LAZY, 1);

	  if (old_profile_map == NULL && GL(dl_profile_map) != NULL)
	    {
	      /* We must prepare the profiling.  */
	      _dl_start_profile ();

	      /* Prevent unloading the object.  */
	      GL(dl_profile_map)->l_flags_1 |= DF_1_NODELETE;
	    }
	}
      else
#endif
	_dl_relocate_object (l, l->l_scope, reloc_mode, 0);
    }

  /* If the file is not loaded now as a dependency, add the search
     list of the newly loaded object to the scope.  */
  bool any_tls = false;
  unsigned int first_static_tls = new->l_searchlist.r_nlist;
  for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
    {
      struct link_map *imap = new->l_searchlist.r_list[i];
      int from_scope = 0;

      /* If the initializer has been called already, the object has
	 not been loaded here and now.  */
      if (imap->l_init_called && imap->l_type == lt_loaded)
	{
	  struct r_scope_elem **runp = imap->l_scope;
	  size_t cnt = 0;

	  while (*runp != NULL)
	    {
	      if (*runp == &new->l_searchlist)
		break;
	      ++cnt;
	      ++runp;
	    }

	  if (*runp != NULL)
	    /* Avoid duplicates.  */
	    continue;

	  if (__builtin_expect (cnt + 1 >= imap->l_scope_max, 0))
	    {
	      /* The 'r_scope' array is too small.  Allocate a new one
		 dynamically.  */
	      size_t new_size;
	      struct r_scope_elem **newp;

#define SCOPE_ELEMS(imap) \
  (sizeof (imap->l_scope_mem) / sizeof (imap->l_scope_mem[0]))

	      if (imap->l_scope != imap->l_scope_mem
		  && imap->l_scope_max < SCOPE_ELEMS (imap))
		{
		  new_size = SCOPE_ELEMS (imap);
		  newp = imap->l_scope_mem;
		}
	      else
		{
		  new_size = imap->l_scope_max * 2;
		  newp = (struct r_scope_elem **)
		    malloc (new_size * sizeof (struct r_scope_elem *));
		  if (newp == NULL)
		    _dl_signal_error (ENOMEM, "dlopen", NULL,
				      N_("cannot create scope list"));
		}

	      memcpy (newp, imap->l_scope, cnt * sizeof (imap->l_scope[0]));
	      struct r_scope_elem **old = imap->l_scope;

	      imap->l_scope = newp;

	      if (old != imap->l_scope_mem)
		_dl_scope_free (old);

	      imap->l_scope_max = new_size;
	    }

	  /* First terminate the extended list.  Otherwise a thread
	     might use the new last element and then use the garbage
	     at offset IDX+1.  */
	  imap->l_scope[cnt + 1] = NULL;
	  atomic_write_barrier ();
	  imap->l_scope[cnt] = &new->l_searchlist;

	  /* Print only new scope information.  */
	  from_scope = cnt;
	}
      /* Only add TLS memory if this object is loaded now and
	 therefore is not yet initialized.  */
      else if (! imap->l_init_called
	       /* Only if the module defines thread local data.  */
	       && __builtin_expect (imap->l_tls_blocksize > 0, 0))
	{
	  /* Now that we know the object is loaded successfully add
	     modules containing TLS data to the slot info table.  We
	     might have to increase its size.  */
	  _dl_add_to_slotinfo (imap);

	  if (imap->l_need_tls_init
	      && first_static_tls == new->l_searchlist.r_nlist)
	    first_static_tls = i;

	  /* We have to bump the generation counter.  */
	  any_tls = true;
	}

      /* Print scope information.  */
      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES, 0))
	_dl_show_scope (imap, from_scope);
    }

  /* Bump the generation number if necessary.  */
  if (any_tls && __builtin_expect (++GL(dl_tls_generation) == 0, 0))
    _dl_fatal_printf (N_("\
TLS generation counter wrapped!  Please report this."));

  /* We need a second pass for static tls data, because _dl_update_slotinfo
     must not be run while calls to _dl_add_to_slotinfo are still pending.  */
  for (unsigned int i = first_static_tls; i < new->l_searchlist.r_nlist; ++i)
    {
      struct link_map *imap = new->l_searchlist.r_list[i];

      if (imap->l_need_tls_init
	  && ! imap->l_init_called
	  && imap->l_tls_blocksize > 0)
	{
	  /* For static TLS we have to allocate the memory here and
	     now.  This includes allocating memory in the DTV.  But we
	     cannot change any DTV other than our own.  So, if we
	     cannot guarantee that there is room in the DTV we don't
	     even try it and fail the load.

	     XXX We could track the minimum DTV slots allocated in
	     all threads.  */
	  if (! RTLD_SINGLE_THREAD_P && imap->l_tls_modid > DTV_SURPLUS)
	    _dl_signal_error (0, "dlopen", NULL, N_("\
cannot load any more object with static TLS"));

	  imap->l_need_tls_init = 0;
#ifdef SHARED
	  /* Update the slot information data for at least the
	     generation of the DSO we are allocating data for.  */
	  _dl_update_slotinfo (imap->l_tls_modid);
#endif

	  GL(dl_init_static_tls) (imap);
	  assert (imap->l_need_tls_init == 0);
	}
    }

  /* Notify the debugger all new objects have been relocated.  */
  if (relocation_in_progress)
    LIBC_PROBE (reloc_complete, 3, args->nsid, r, new);

  /* Run the initializer functions of new objects.  */
  _dl_init (new, args->argc, args->argv, args->env);

  /* Now we can make the new map available in the global scope.  */
  if (mode & RTLD_GLOBAL)
    /* Move the object in the global namespace.  */
    if (add_to_global (new) != 0)
      /* It failed.  */
      return;

  /* Mark the object as not deletable if the RTLD_NODELETE flags was
     passed.  */
  if (__builtin_expect (mode & RTLD_NODELETE, 0))
    new->l_flags_1 |= DF_1_NODELETE;

#ifndef SHARED
  /* We must be the static _dl_open in libc.a.  A static program that
     has loaded a dynamic object now has competition.  */
  __libc_multiple_libcs = 1;
#endif

  /* Let the user know about the opencount.  */
  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
    _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
		      new->l_name, new->l_ns, new->l_direct_opencount);
}


void *
_dl_open (const char *file, int mode, const void *caller_dlopen, Lmid_t nsid,
	  int argc, char *argv[], char *env[])
{
  if ((mode & RTLD_BINDING_MASK) == 0)
    /* One of the flags must be set.  */
    _dl_signal_error (EINVAL, file, NULL, N_("invalid mode for dlopen()"));

  /* Make sure we are alone.  */
  __rtld_lock_lock_recursive (GL(dl_load_lock));

  if (__builtin_expect (nsid == LM_ID_NEWLM, 0))
    {
      /* Find a new namespace.  */
      for (nsid = 1; DL_NNS > 1 && nsid < GL(dl_nns); ++nsid)
	if (GL(dl_ns)[nsid]._ns_loaded == NULL)
	  break;

      if (__builtin_expect (nsid == DL_NNS, 0))
	{
	  /* No more namespace available.  */
	  __rtld_lock_unlock_recursive (GL(dl_load_lock));

	  _dl_signal_error (EINVAL, file, NULL, N_("\
no more namespaces available for dlmopen()"));
	}
      else if (nsid == GL(dl_nns))
	{
	  __rtld_lock_initialize (GL(dl_ns)[nsid]._ns_unique_sym_table.lock);
	  ++GL(dl_nns);
	}

      _dl_debug_initialize (0, nsid)->r_state = RT_CONSISTENT;
    }
  /* Never allow loading a DSO in a namespace which is empty.  Such
     direct placements is only causing problems.  Also don't allow
     loading into a namespace used for auditing.  */
  else if (__builtin_expect (nsid != LM_ID_BASE && nsid != __LM_ID_CALLER, 0)
	   && (GL(dl_ns)[nsid]._ns_nloaded == 0
	       || GL(dl_ns)[nsid]._ns_loaded->l_auditing))
    _dl_signal_error (EINVAL, file, NULL,
		      N_("invalid target namespace in dlmopen()"));
#ifndef SHARED
  else if ((nsid == LM_ID_BASE || nsid == __LM_ID_CALLER)
	   && GL(dl_ns)[LM_ID_BASE]._ns_loaded == NULL
	   && GL(dl_nns) == 0)
    GL(dl_nns) = 1;
#endif

  struct dl_open_args args;
  args.file = file;
  args.mode = mode;
  args.caller_dlopen = caller_dlopen;
  args.caller_dl_open = RETURN_ADDRESS (0);
  args.map = NULL;
  args.nsid = nsid;
  args.argc = argc;
  args.argv = argv;
  args.env = env;

  const char *objname;
  const char *errstring;
  bool malloced;
  int errcode = _dl_catch_error (&objname, &errstring, &malloced,
				 dl_open_worker, &args);

#if defined USE_LDCONFIG && !defined MAP_COPY
  /* We must unmap the cache file.  */
  _dl_unload_cache ();
#endif

  /* See if an error occurred during loading.  */
  if (__builtin_expect (errstring != NULL, 0))
    {
      /* Remove the object from memory.  It may be in an inconsistent
	 state if relocation failed, for example.  */
      if (args.map)
	{
	  /* Maybe some of the modules which were loaded use TLS.
	     Since it will be removed in the following _dl_close call
	     we have to mark the dtv array as having gaps to fill the
	     holes.  This is a pessimistic assumption which won't hurt
	     if not true.  There is no need to do this when we are
	     loading the auditing DSOs since TLS has not yet been set
	     up.  */
	  if ((mode & __RTLD_AUDIT) == 0)
	    GL(dl_tls_dtv_gaps) = true;

	  _dl_close_worker (args.map);
	}

      assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);

      /* Release the lock.  */
      __rtld_lock_unlock_recursive (GL(dl_load_lock));

      /* Make a local copy of the error string so that we can release the
	 memory allocated for it.  */
      size_t len_errstring = strlen (errstring) + 1;
      char *local_errstring;
      if (objname == errstring + len_errstring)
	{
	  size_t total_len = len_errstring + strlen (objname) + 1;
	  local_errstring = alloca (total_len);
	  memcpy (local_errstring, errstring, total_len);
	  objname = local_errstring + len_errstring;
	}
      else
	{
	  local_errstring = alloca (len_errstring);
	  memcpy (local_errstring, errstring, len_errstring);
	}

      if (malloced)
	free ((char *) errstring);

      /* Reraise the error.  */
      _dl_signal_error (errcode, objname, NULL, local_errstring);
    }

  assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT);

  /* Release the lock.  */
  __rtld_lock_unlock_recursive (GL(dl_load_lock));

#ifndef SHARED
  DL_STATIC_INIT (args.map);
#endif

  return args.map;
}


void
_dl_show_scope (struct link_map *l, int from)
{
  _dl_debug_printf ("object=%s [%lu]\n",
		    *l->l_name ? l->l_name : rtld_progname, l->l_ns);
  if (l->l_scope != NULL)
    for (int scope_cnt = from; l->l_scope[scope_cnt] != NULL; ++scope_cnt)
      {
	_dl_debug_printf (" scope %u:", scope_cnt);

	for (unsigned int cnt = 0; cnt < l->l_scope[scope_cnt]->r_nlist; ++cnt)
	  if (*l->l_scope[scope_cnt]->r_list[cnt]->l_name)
	    _dl_debug_printf_c (" %s",
				l->l_scope[scope_cnt]->r_list[cnt]->l_name);
	  else
	    _dl_debug_printf_c (" %s", rtld_progname);

	_dl_debug_printf_c ("\n");
      }
  else
    _dl_debug_printf (" no scope\n");
  _dl_debug_printf ("\n");
}

#ifdef IS_IN_rtld
/* Return non-zero if ADDR lies within one of L's segments.  */
int
internal_function
_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
{
  int n = l->l_phnum;
  const ElfW(Addr) reladdr = addr - l->l_addr;

  while (--n >= 0)
    if (l->l_phdr[n].p_type == PT_LOAD
	&& reladdr - l->l_phdr[n].p_vaddr >= 0
	&& reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz)
      return 1;
  return 0;
}
#endif