about summary refs log tree commit diff
path: root/elf/dl-load.c
blob: 1be7a3ca967d2c7d463583bd9f1ced036b3c075a (plain) (blame)
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
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
/* Map in a shared object's segments from the file.
   Copyright (C) 1995-2014 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 <elf.h>
#include <errno.h>
#include <fcntl.h>
#include <libintl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <bits/wordsize.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "dynamic-link.h"
#include <abi-tag.h>
#include <stackinfo.h>
#include <caller.h>
#include <sysdep.h>
#include <stap-probe.h>

#include <dl-dst.h>

/* On some systems, no flag bits are given to specify file mapping.  */
#ifndef MAP_FILE
# define MAP_FILE	0
#endif

/* The right way to map in the shared library files is MAP_COPY, which
   makes a virtual copy of the data at the time of the mmap call; this
   guarantees the mapped pages will be consistent even if the file is
   overwritten.  Some losing VM systems like Linux's lack MAP_COPY.  All we
   get is MAP_PRIVATE, which copies each page when it is modified; this
   means if the file is overwritten, we may at some point get some pages
   from the new version after starting with pages from the old version.

   To make up for the lack and avoid the overwriting problem,
   what Linux does have is MAP_DENYWRITE.  This prevents anyone
   from modifying the file while we have it mapped.  */
#ifndef MAP_COPY
# ifdef MAP_DENYWRITE
#  define MAP_COPY	(MAP_PRIVATE | MAP_DENYWRITE)
# else
#  define MAP_COPY	MAP_PRIVATE
# endif
#endif

/* Some systems link their relocatable objects for another base address
   than 0.  We want to know the base address for these such that we can
   subtract this address from the segment addresses during mapping.
   This results in a more efficient address space usage.  Defaults to
   zero for almost all systems.  */
#ifndef MAP_BASE_ADDR
# define MAP_BASE_ADDR(l)	0
#endif


#include <endian.h>
#if BYTE_ORDER == BIG_ENDIAN
# define byteorder ELFDATA2MSB
#elif BYTE_ORDER == LITTLE_ENDIAN
# define byteorder ELFDATA2LSB
#else
# error "Unknown BYTE_ORDER " BYTE_ORDER
# define byteorder ELFDATANONE
#endif

#define STRING(x) __STRING (x)

/* Handle situations where we have a preferred location in memory for
   the shared objects.  */
#ifdef ELF_PREFERRED_ADDRESS_DATA
ELF_PREFERRED_ADDRESS_DATA;
#endif
#ifndef ELF_PREFERRED_ADDRESS
# define ELF_PREFERRED_ADDRESS(loader, maplength, mapstartpref) (mapstartpref)
#endif
#ifndef ELF_FIXED_ADDRESS
# define ELF_FIXED_ADDRESS(loader, mapstart) ((void) 0)
#endif


int __stack_prot attribute_hidden attribute_relro
#if _STACK_GROWS_DOWN && defined PROT_GROWSDOWN
  = PROT_GROWSDOWN;
#elif _STACK_GROWS_UP && defined PROT_GROWSUP
  = PROT_GROWSUP;
#else
  = 0;
#endif


/* Type for the buffer we put the ELF header and hopefully the program
   header.  This buffer does not really have to be too large.  In most
   cases the program header follows the ELF header directly.  If this
   is not the case all bets are off and we can make the header
   arbitrarily large and still won't get it read.  This means the only
   question is how large are the ELF and program header combined.  The
   ELF header 32-bit files is 52 bytes long and in 64-bit files is 64
   bytes long.  Each program header entry is again 32 and 56 bytes
   long respectively.  I.e., even with a file which has 10 program
   header entries we only have to read 372B/624B respectively.  Add to
   this a bit of margin for program notes and reading 512B and 832B
   for 32-bit and 64-bit files respecitvely is enough.  If this
   heuristic should really fail for some file the code in
   `_dl_map_object_from_fd' knows how to recover.  */
struct filebuf
{
  ssize_t len;
#if __WORDSIZE == 32
# define FILEBUF_SIZE 512
#else
# define FILEBUF_SIZE 832
#endif
  char buf[FILEBUF_SIZE] __attribute__ ((aligned (__alignof (ElfW(Ehdr)))));
};

/* This is the decomposed LD_LIBRARY_PATH search path.  */
static struct r_search_path_struct env_path_list attribute_relro;

/* List of the hardware capabilities we might end up using.  */
static const struct r_strlenpair *capstr attribute_relro;
static size_t ncapstr attribute_relro;
static size_t max_capstrlen attribute_relro;


/* Get the generated information about the trusted directories.  */
#include "trusted-dirs.h"

static const char system_dirs[] = SYSTEM_DIRS;
static const size_t system_dirs_len[] =
{
  SYSTEM_DIRS_LEN
};
#define nsystem_dirs_len \
  (sizeof (system_dirs_len) / sizeof (system_dirs_len[0]))


/* Local version of `strdup' function.  */
static char *
local_strdup (const char *s)
{
  size_t len = strlen (s) + 1;
  void *new = malloc (len);

  if (new == NULL)
    return NULL;

  return (char *) memcpy (new, s, len);
}


static bool
is_trusted_path (const char *path, size_t len)
{
  const char *trun = system_dirs;

  for (size_t idx = 0; idx < nsystem_dirs_len; ++idx)
    {
      if (len == system_dirs_len[idx] && memcmp (trun, path, len) == 0)
	/* Found it.  */
	return true;

      trun += system_dirs_len[idx] + 1;
    }

  return false;
}


static bool
is_trusted_path_normalize (const char *path, size_t len)
{
  if (len == 0)
    return false;

  if (*path == ':')
    {
      ++path;
      --len;
    }

  char *npath = (char *) alloca (len + 2);
  char *wnp = npath;
  while (*path != '\0')
    {
      if (path[0] == '/')
	{
	  if (path[1] == '.')
	    {
	      if (path[2] == '.' && (path[3] == '/' || path[3] == '\0'))
		{
		  while (wnp > npath && *--wnp != '/')
		    ;
		  path += 3;
		  continue;
		}
	      else if (path[2] == '/' || path[2] == '\0')
		{
		  path += 2;
		  continue;
		}
	    }

	  if (wnp > npath && wnp[-1] == '/')
	    {
	      ++path;
	      continue;
	    }
	}

      *wnp++ = *path++;
    }

  if (wnp == npath || wnp[-1] != '/')
    *wnp++ = '/';

  const char *trun = system_dirs;

  for (size_t idx = 0; idx < nsystem_dirs_len; ++idx)
    {
      if (wnp - npath >= system_dirs_len[idx]
	  && memcmp (trun, npath, system_dirs_len[idx]) == 0)
	/* Found it.  */
	return true;

      trun += system_dirs_len[idx] + 1;
    }

  return false;
}


static size_t
is_dst (const char *start, const char *name, const char *str,
	int is_path, int secure)
{
  size_t len;
  bool is_curly = false;

  if (name[0] == '{')
    {
      is_curly = true;
      ++name;
    }

  len = 0;
  while (name[len] == str[len] && name[len] != '\0')
    ++len;

  if (is_curly)
    {
      if (name[len] != '}')
	return 0;

      /* Point again at the beginning of the name.  */
      --name;
      /* Skip over closing curly brace and adjust for the --name.  */
      len += 2;
    }
  else if (name[len] != '\0' && name[len] != '/'
	   && (!is_path || name[len] != ':'))
    return 0;

  if (__builtin_expect (secure, 0)
      && ((name[len] != '\0' && name[len] != '/'
	   && (!is_path || name[len] != ':'))
	  || (name != start + 1 && (!is_path || name[-2] != ':'))))
    return 0;

  return len;
}


size_t
_dl_dst_count (const char *name, int is_path)
{
  const char *const start = name;
  size_t cnt = 0;

  do
    {
      size_t len;

      /* $ORIGIN is not expanded for SUID/GUID programs (except if it
	 is $ORIGIN alone) and it must always appear first in path.  */
      ++name;
      if ((len = is_dst (start, name, "ORIGIN", is_path,
			 INTUSE(__libc_enable_secure))) != 0
	  || (len = is_dst (start, name, "PLATFORM", is_path, 0)) != 0
	  || (len = is_dst (start, name, "LIB", is_path, 0)) != 0)
	++cnt;

      name = strchr (name + len, '$');
    }
  while (name != NULL);

  return cnt;
}


char *
_dl_dst_substitute (struct link_map *l, const char *name, char *result,
		    int is_path)
{
  const char *const start = name;

  /* Now fill the result path.  While copying over the string we keep
     track of the start of the last path element.  When we come across
     a DST we copy over the value or (if the value is not available)
     leave the entire path element out.  */
  char *wp = result;
  char *last_elem = result;
  bool check_for_trusted = false;

  do
    {
      if (__builtin_expect (*name == '$', 0))
	{
	  const char *repl = NULL;
	  size_t len;

	  ++name;
	  if ((len = is_dst (start, name, "ORIGIN", is_path,
			     INTUSE(__libc_enable_secure))) != 0)
	    {
	      repl = l->l_origin;
	      check_for_trusted = (INTUSE(__libc_enable_secure)
				   && l->l_type == lt_executable);
	    }
	  else if ((len = is_dst (start, name, "PLATFORM", is_path, 0)) != 0)
	    repl = GLRO(dl_platform);
	  else if ((len = is_dst (start, name, "LIB", is_path, 0)) != 0)
	    repl = DL_DST_LIB;

	  if (repl != NULL && repl != (const char *) -1)
	    {
	      wp = __stpcpy (wp, repl);
	      name += len;
	    }
	  else if (len > 1)
	    {
	      /* We cannot use this path element, the value of the
		 replacement is unknown.  */
	      wp = last_elem;
	      name += len;
	      while (*name != '\0' && (!is_path || *name != ':'))
		++name;
	      /* Also skip following colon if this is the first rpath
		 element, but keep an empty element at the end.  */
	      if (wp == result && is_path && *name == ':' && name[1] != '\0')
		++name;
	    }
	  else
	    /* No DST we recognize.  */
	    *wp++ = '$';
	}
      else
	{
	  *wp++ = *name++;
	  if (is_path && *name == ':')
	    {
	      /* In SUID/SGID programs, after $ORIGIN expansion the
		 normalized path must be rooted in one of the trusted
		 directories.  */
	      if (__builtin_expect (check_for_trusted, false)
		  && !is_trusted_path_normalize (last_elem, wp - last_elem))
		wp = last_elem;
	      else
		last_elem = wp;

	      check_for_trusted = false;
	    }
	}
    }
  while (*name != '\0');

  /* In SUID/SGID programs, after $ORIGIN expansion the normalized
     path must be rooted in one of the trusted directories.  */
  if (__builtin_expect (check_for_trusted, false)
      && !is_trusted_path_normalize (last_elem, wp - last_elem))
    wp = last_elem;

  *wp = '\0';

  return result;
}


/* Return copy of argument with all recognized dynamic string tokens
   ($ORIGIN and $PLATFORM for now) replaced.  On some platforms it
   might not be possible to determine the path from which the object
   belonging to the map is loaded.  In this case the path element
   containing $ORIGIN is left out.  */
static char *
expand_dynamic_string_token (struct link_map *l, const char *s, int is_path)
{
  /* We make two runs over the string.  First we determine how large the
     resulting string is and then we copy it over.  Since this is no
     frequently executed operation we are looking here not for performance
     but rather for code size.  */
  size_t cnt;
  size_t total;
  char *result;

  /* Determine the number of DST elements.  */
  cnt = DL_DST_COUNT (s, is_path);

  /* If we do not have to replace anything simply copy the string.  */
  if (__builtin_expect (cnt, 0) == 0)
    return local_strdup (s);

  /* Determine the length of the substituted string.  */
  total = DL_DST_REQUIRED (l, s, strlen (s), cnt);

  /* Allocate the necessary memory.  */
  result = (char *) malloc (total + 1);
  if (result == NULL)
    return NULL;

  return _dl_dst_substitute (l, s, result, is_path);
}


/* Add `name' to the list of names for a particular shared object.
   `name' is expected to have been allocated with malloc and will
   be freed if the shared object already has this name.
   Returns false if the object already had this name.  */
static void
internal_function
add_name_to_object (struct link_map *l, const char *name)
{
  struct libname_list *lnp, *lastp;
  struct libname_list *newname;
  size_t name_len;

  lastp = NULL;
  for (lnp = l->l_libname; lnp != NULL; lastp = lnp, lnp = lnp->next)
    if (strcmp (name, lnp->name) == 0)
      return;

  name_len = strlen (name) + 1;
  newname = (struct libname_list *) malloc (sizeof *newname + name_len);
  if (newname == NULL)
    {
      /* No more memory.  */
      _dl_signal_error (ENOMEM, name, NULL, N_("cannot allocate name record"));
      return;
    }
  /* The object should have a libname set from _dl_new_object.  */
  assert (lastp != NULL);

  newname->name = memcpy (newname + 1, name, name_len);
  newname->next = NULL;
  newname->dont_free = 0;
  lastp->next = newname;
}

/* Standard search directories.  */
static struct r_search_path_struct rtld_search_dirs attribute_relro;

static size_t max_dirnamelen;

static struct r_search_path_elem **
fillin_rpath (char *rpath, struct r_search_path_elem **result, const char *sep,
	      int check_trusted, const char *what, const char *where,
	      struct link_map *l)
{
  char *cp;
  size_t nelems = 0;
  char *to_free;

  while ((cp = __strsep (&rpath, sep)) != NULL)
    {
      struct r_search_path_elem *dirp;

      to_free = cp = expand_dynamic_string_token (l, cp, 1);

      size_t len = strlen (cp);

      /* `strsep' can pass an empty string.  This has to be
	 interpreted as `use the current directory'. */
      if (len == 0)
	{
	  static const char curwd[] = "./";
	  cp = (char *) curwd;
	}

      /* Remove trailing slashes (except for "/").  */
      while (len > 1 && cp[len - 1] == '/')
	--len;

      /* Now add one if there is none so far.  */
      if (len > 0 && cp[len - 1] != '/')
	cp[len++] = '/';

      /* Make sure we don't use untrusted directories if we run SUID.  */
      if (__builtin_expect (check_trusted, 0) && !is_trusted_path (cp, len))
	{
	  free (to_free);
	  continue;
	}

      /* See if this directory is already known.  */
      for (dirp = GL(dl_all_dirs); dirp != NULL; dirp = dirp->next)
	if (dirp->dirnamelen == len && memcmp (cp, dirp->dirname, len) == 0)
	  break;

      if (dirp != NULL)
	{
	  /* It is available, see whether it's on our own list.  */
	  size_t cnt;
	  for (cnt = 0; cnt < nelems; ++cnt)
	    if (result[cnt] == dirp)
	      break;

	  if (cnt == nelems)
	    result[nelems++] = dirp;
	}
      else
	{
	  size_t cnt;
	  enum r_dir_status init_val;
	  size_t where_len = where ? strlen (where) + 1 : 0;

	  /* It's a new directory.  Create an entry and add it.  */
	  dirp = (struct r_search_path_elem *)
	    malloc (sizeof (*dirp) + ncapstr * sizeof (enum r_dir_status)
		    + where_len + len + 1);
	  if (dirp == NULL)
	    _dl_signal_error (ENOMEM, NULL, NULL,
			      N_("cannot create cache for search path"));

	  dirp->dirname = ((char *) dirp + sizeof (*dirp)
			   + ncapstr * sizeof (enum r_dir_status));
	  *((char *) __mempcpy ((char *) dirp->dirname, cp, len)) = '\0';
	  dirp->dirnamelen = len;

	  if (len > max_dirnamelen)
	    max_dirnamelen = len;

	  /* We have to make sure all the relative directories are
	     never ignored.  The current directory might change and
	     all our saved information would be void.  */
	  init_val = cp[0] != '/' ? existing : unknown;
	  for (cnt = 0; cnt < ncapstr; ++cnt)
	    dirp->status[cnt] = init_val;

	  dirp->what = what;
	  if (__builtin_expect (where != NULL, 1))
	    dirp->where = memcpy ((char *) dirp + sizeof (*dirp) + len + 1
				  + (ncapstr * sizeof (enum r_dir_status)),
				  where, where_len);
	  else
	    dirp->where = NULL;

	  dirp->next = GL(dl_all_dirs);
	  GL(dl_all_dirs) = dirp;

	  /* Put it in the result array.  */
	  result[nelems++] = dirp;
	}
      free (to_free);
    }

  /* Terminate the array.  */
  result[nelems] = NULL;

  return result;
}


static bool
internal_function
decompose_rpath (struct r_search_path_struct *sps,
		 const char *rpath, struct link_map *l, const char *what)
{
  /* Make a copy we can work with.  */
  const char *where = l->l_name;
  char *copy;
  char *cp;
  struct r_search_path_elem **result;
  size_t nelems;
  /* Initialize to please the compiler.  */
  const char *errstring = NULL;

  /* First see whether we must forget the RUNPATH and RPATH from this
     object.  */
  if (__builtin_expect (GLRO(dl_inhibit_rpath) != NULL, 0)
      && !INTUSE(__libc_enable_secure))
    {
      const char *inhp = GLRO(dl_inhibit_rpath);

      do
	{
	  const char *wp = where;

	  while (*inhp == *wp && *wp != '\0')
	    {
	      ++inhp;
	      ++wp;
	    }

	  if (*wp == '\0' && (*inhp == '\0' || *inhp == ':'))
	    {
	      /* This object is on the list of objects for which the
		 RUNPATH and RPATH must not be used.  */
	      sps->dirs = (void *) -1;
	      return false;
	    }

	  while (*inhp != '\0')
	    if (*inhp++ == ':')
	      break;
	}
      while (*inhp != '\0');
    }

  /* Make a writable copy.  */
  copy = local_strdup (rpath);
  if (copy == NULL)
    {
      errstring = N_("cannot create RUNPATH/RPATH copy");
      goto signal_error;
    }

  /* Ignore empty rpaths.  */
  if (*copy == 0)
    {
      free (copy);
      sps->dirs = (struct r_search_path_elem **) -1;
      return false;
    }

  /* Count the number of necessary elements in the result array.  */
  nelems = 0;
  for (cp = copy; *cp != '\0'; ++cp)
    if (*cp == ':')
      ++nelems;

  /* Allocate room for the result.  NELEMS + 1 is an upper limit for the
     number of necessary entries.  */
  result = (struct r_search_path_elem **) malloc ((nelems + 1 + 1)
						  * sizeof (*result));
  if (result == NULL)
    {
      free (copy);
      errstring = N_("cannot create cache for search path");
    signal_error:
      _dl_signal_error (ENOMEM, NULL, NULL, errstring);
    }

  fillin_rpath (copy, result, ":", 0, what, where, l);

  /* Free the copied RPATH string.  `fillin_rpath' make own copies if
     necessary.  */
  free (copy);

  sps->dirs = result;
  /* The caller will change this value if we haven't used a real malloc.  */
  sps->malloced = 1;
  return true;
}

/* Make sure cached path information is stored in *SP
   and return true if there are any paths to search there.  */
static bool
cache_rpath (struct link_map *l,
	     struct r_search_path_struct *sp,
	     int tag,
	     const char *what)
{
  if (sp->dirs == (void *) -1)
    return false;

  if (sp->dirs != NULL)
    return true;

  if (l->l_info[tag] == NULL)
    {
      /* There is no path.  */
      sp->dirs = (void *) -1;
      return false;
    }

  /* Make sure the cache information is available.  */
  return decompose_rpath (sp, (const char *) (D_PTR (l, l_info[DT_STRTAB])
					      + l->l_info[tag]->d_un.d_val),
			  l, what);
}


void
internal_function
_dl_init_paths (const char *llp)
{
  size_t idx;
  const char *strp;
  struct r_search_path_elem *pelem, **aelem;
  size_t round_size;
  struct link_map __attribute__ ((unused)) *l = NULL;
  /* Initialize to please the compiler.  */
  const char *errstring = NULL;

  /* Fill in the information about the application's RPATH and the
     directories addressed by the LD_LIBRARY_PATH environment variable.  */

  /* Get the capabilities.  */
  capstr = _dl_important_hwcaps (GLRO(dl_platform), GLRO(dl_platformlen),
				 &ncapstr, &max_capstrlen);

  /* First set up the rest of the default search directory entries.  */
  aelem = rtld_search_dirs.dirs = (struct r_search_path_elem **)
    malloc ((nsystem_dirs_len + 1) * sizeof (struct r_search_path_elem *));
  if (rtld_search_dirs.dirs == NULL)
    {
      errstring = N_("cannot create search path array");
    signal_error:
      _dl_signal_error (ENOMEM, NULL, NULL, errstring);
    }

  round_size = ((2 * sizeof (struct r_search_path_elem) - 1
		 + ncapstr * sizeof (enum r_dir_status))
		/ sizeof (struct r_search_path_elem));

  rtld_search_dirs.dirs[0] = (struct r_search_path_elem *)
    malloc ((sizeof (system_dirs) / sizeof (system_dirs[0]))
	    * round_size * sizeof (struct r_search_path_elem));
  if (rtld_search_dirs.dirs[0] == NULL)
    {
      errstring = N_("cannot create cache for search path");
      goto signal_error;
    }

  rtld_search_dirs.malloced = 0;
  pelem = GL(dl_all_dirs) = rtld_search_dirs.dirs[0];
  strp = system_dirs;
  idx = 0;

  do
    {
      size_t cnt;

      *aelem++ = pelem;

      pelem->what = "system search path";
      pelem->where = NULL;

      pelem->dirname = strp;
      pelem->dirnamelen = system_dirs_len[idx];
      strp += system_dirs_len[idx] + 1;

      /* System paths must be absolute.  */
      assert (pelem->dirname[0] == '/');
      for (cnt = 0; cnt < ncapstr; ++cnt)
	pelem->status[cnt] = unknown;

      pelem->next = (++idx == nsystem_dirs_len ? NULL : (pelem + round_size));

      pelem += round_size;
    }
  while (idx < nsystem_dirs_len);

  max_dirnamelen = SYSTEM_DIRS_MAX_LEN;
  *aelem = NULL;

#ifdef SHARED
  /* This points to the map of the main object.  */
  l = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
  if (l != NULL)
    {
      assert (l->l_type != lt_loaded);

      if (l->l_info[DT_RUNPATH])
	{
	  /* Allocate room for the search path and fill in information
	     from RUNPATH.  */
	  decompose_rpath (&l->l_runpath_dirs,
			   (const void *) (D_PTR (l, l_info[DT_STRTAB])
					   + l->l_info[DT_RUNPATH]->d_un.d_val),
			   l, "RUNPATH");
	  /* During rtld init the memory is allocated by the stub malloc,
	     prevent any attempt to free it by the normal malloc.  */
	  l->l_runpath_dirs.malloced = 0;

	  /* The RPATH is ignored.  */
	  l->l_rpath_dirs.dirs = (void *) -1;
	}
      else
	{
	  l->l_runpath_dirs.dirs = (void *) -1;

	  if (l->l_info[DT_RPATH])
	    {
	      /* Allocate room for the search path and fill in information
		 from RPATH.  */
	      decompose_rpath (&l->l_rpath_dirs,
			       (const void *) (D_PTR (l, l_info[DT_STRTAB])
					       + l->l_info[DT_RPATH]->d_un.d_val),
			       l, "RPATH");
	      /* During rtld init the memory is allocated by the stub
		 malloc, prevent any attempt to free it by the normal
		 malloc.  */
	      l->l_rpath_dirs.malloced = 0;
	    }
	  else
	    l->l_rpath_dirs.dirs = (void *) -1;
	}
    }
#endif	/* SHARED */

  if (llp != NULL && *llp != '\0')
    {
      size_t nllp;
      const char *cp = llp;
      char *llp_tmp;

#ifdef SHARED
      /* Expand DSTs.  */
      size_t cnt = DL_DST_COUNT (llp, 1);
      if (__builtin_expect (cnt == 0, 1))
	llp_tmp = strdupa (llp);
      else
	{
	  /* Determine the length of the substituted string.  */
	  size_t total = DL_DST_REQUIRED (l, llp, strlen (llp), cnt);

	  /* Allocate the necessary memory.  */
	  llp_tmp = (char *) alloca (total + 1);
	  llp_tmp = _dl_dst_substitute (l, llp, llp_tmp, 1);
	}
#else
      llp_tmp = strdupa (llp);
#endif

      /* Decompose the LD_LIBRARY_PATH contents.  First determine how many
	 elements it has.  */
      nllp = 1;
      while (*cp)
	{
	  if (*cp == ':' || *cp == ';')
	    ++nllp;
	  ++cp;
	}

      env_path_list.dirs = (struct r_search_path_elem **)
	malloc ((nllp + 1) * sizeof (struct r_search_path_elem *));
      if (env_path_list.dirs == NULL)
	{
	  errstring = N_("cannot create cache for search path");
	  goto signal_error;
	}

      (void) fillin_rpath (llp_tmp, env_path_list.dirs, ":;",
			   INTUSE(__libc_enable_secure), "LD_LIBRARY_PATH",
			   NULL, l);

      if (env_path_list.dirs[0] == NULL)
	{
	  free (env_path_list.dirs);
	  env_path_list.dirs = (void *) -1;
	}

      env_path_list.malloced = 0;
    }
  else
    env_path_list.dirs = (void *) -1;
}


static void
__attribute__ ((noreturn, noinline))
lose (int code, int fd, const char *name, char *realname, struct link_map *l,
      const char *msg, struct r_debug *r, Lmid_t nsid)
{
  /* The file might already be closed.  */
  if (fd != -1)
    (void) __close (fd);
  if (l != NULL && l->l_origin != (char *) -1l)
    free ((char *) l->l_origin);
  free (l);
  free (realname);

  if (r != NULL)
    {
      r->r_state = RT_CONSISTENT;
      _dl_debug_state ();
      LIBC_PROBE (map_failed, 2, nsid, r);
    }

  _dl_signal_error (code, name, NULL, msg);
}


/* Map in the shared object NAME, actually located in REALNAME, and already
   opened on FD.  */

#ifndef EXTERNAL_MAP_FROM_FD
static
#endif
struct link_map *
_dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
			char *realname, struct link_map *loader, int l_type,
			int mode, void **stack_endp, Lmid_t nsid)
{
  struct link_map *l = NULL;
  const ElfW(Ehdr) *header;
  const ElfW(Phdr) *phdr;
  const ElfW(Phdr) *ph;
  size_t maplength;
  int type;
  struct stat64 st;
  /* Initialize to keep the compiler happy.  */
  const char *errstring = NULL;
  int errval = 0;
  struct r_debug *r = _dl_debug_initialize (0, nsid);
  bool make_consistent = false;

  /* Get file information.  */
  if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st) < 0, 0))
    {
      errstring = N_("cannot stat shared object");
    call_lose_errno:
      errval = errno;
    call_lose:
      lose (errval, fd, name, realname, l, errstring,
	    make_consistent ? r : NULL, nsid);
    }

  /* Look again to see if the real name matched another already loaded.  */
  for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
    if (l->l_removed == 0 && l->l_ino == st.st_ino && l->l_dev == st.st_dev)
      {
	/* The object is already loaded.
	   Just bump its reference count and return it.  */
	__close (fd);

	/* If the name is not in the list of names for this object add
	   it.  */
	free (realname);
	add_name_to_object (l, name);

	return l;
      }

#ifdef SHARED
  /* When loading into a namespace other than the base one we must
     avoid loading ld.so since there can only be one copy.  Ever.  */
  if (__builtin_expect (nsid != LM_ID_BASE, 0)
      && ((st.st_ino == GL(dl_rtld_map).l_ino
	   && st.st_dev == GL(dl_rtld_map).l_dev)
	  || _dl_name_match_p (name, &GL(dl_rtld_map))))
    {
      /* This is indeed ld.so.  Create a new link_map which refers to
	 the real one for almost everything.  */
      l = _dl_new_object (realname, name, l_type, loader, mode, nsid);
      if (l == NULL)
	goto fail_new;

      /* Refer to the real descriptor.  */
      l->l_real = &GL(dl_rtld_map);

      /* No need to bump the refcount of the real object, ld.so will
	 never be unloaded.  */
      __close (fd);

      /* Add the map for the mirrored object to the object list.  */
      _dl_add_to_namespace_list (l, nsid);

      return l;
    }
#endif

  if (mode & RTLD_NOLOAD)
    {
      /* We are not supposed to load the object unless it is already
	 loaded.  So return now.  */
      free (realname);
      __close (fd);
      return NULL;
    }

  /* Print debugging message.  */
  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
    _dl_debug_printf ("file=%s [%lu];  generating link map\n", name, nsid);

  /* This is the ELF header.  We read it in `open_verify'.  */
  header = (void *) fbp->buf;

#ifndef MAP_ANON
# define MAP_ANON 0
  if (_dl_zerofd == -1)
    {
      _dl_zerofd = _dl_sysdep_open_zero_fill ();
      if (_dl_zerofd == -1)
	{
	  free (realname);
	  __close (fd);
	  _dl_signal_error (errno, NULL, NULL,
			    N_("cannot open zero fill device"));
	}
    }
#endif

  /* Signal that we are going to add new objects.  */
  if (r->r_state == RT_CONSISTENT)
    {
#ifdef SHARED
      /* Auditing checkpoint: we are going to add new objects.  */
      if ((mode & __RTLD_AUDIT) == 0
	  && __builtin_expect (GLRO(dl_naudit) > 0, 0))
	{
	  struct link_map *head = GL(dl_ns)[nsid]._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_ADD);

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

      /* Notify the debugger we have added some objects.  We need to
	 call _dl_debug_initialize in a static program in case dynamic
	 linking has not been used before.  */
      r->r_state = RT_ADD;
      _dl_debug_state ();
      LIBC_PROBE (map_start, 2, nsid, r);
      make_consistent = true;
    }
  else
    assert (r->r_state == RT_ADD);

  /* Enter the new object in the list of loaded objects.  */
  l = _dl_new_object (realname, name, l_type, loader, mode, nsid);
  if (__builtin_expect (l == NULL, 0))
    {
#ifdef SHARED
    fail_new:
#endif
      errstring = N_("cannot create shared object descriptor");
      goto call_lose_errno;
    }

  /* Extract the remaining details we need from the ELF header
     and then read in the program header table.  */
  l->l_entry = header->e_entry;
  type = header->e_type;
  l->l_phnum = header->e_phnum;

  maplength = header->e_phnum * sizeof (ElfW(Phdr));
  if (header->e_phoff + maplength <= (size_t) fbp->len)
    phdr = (void *) (fbp->buf + header->e_phoff);
  else
    {
      phdr = alloca (maplength);
      __lseek (fd, header->e_phoff, SEEK_SET);
      if ((size_t) __libc_read (fd, (void *) phdr, maplength) != maplength)
	{
	  errstring = N_("cannot read file data");
	  goto call_lose_errno;
	}
    }

   /* On most platforms presume that PT_GNU_STACK is absent and the stack is
    * executable.  Other platforms default to a nonexecutable stack and don't
    * need PT_GNU_STACK to do so.  */
   uint_fast16_t stack_flags = DEFAULT_STACK_PERMS;

  {
    /* Scan the program header table, collecting its load commands.  */
    struct loadcmd
      {
	ElfW(Addr) mapstart, mapend, dataend, allocend;
	ElfW(Off) mapoff;
	int prot;
      } loadcmds[l->l_phnum], *c;
    size_t nloadcmds = 0;
    bool has_holes = false;

    /* The struct is initialized to zero so this is not necessary:
    l->l_ld = 0;
    l->l_phdr = 0;
    l->l_addr = 0; */
    for (ph = phdr; ph < &phdr[l->l_phnum]; ++ph)
      switch (ph->p_type)
	{
	  /* These entries tell us where to find things once the file's
	     segments are mapped in.  We record the addresses it says
	     verbatim, and later correct for the run-time load address.  */
	case PT_DYNAMIC:
	  l->l_ld = (void *) ph->p_vaddr;
	  l->l_ldnum = ph->p_memsz / sizeof (ElfW(Dyn));
	  break;

	case PT_PHDR:
	  l->l_phdr = (void *) ph->p_vaddr;
	  break;

	case PT_LOAD:
	  /* A load command tells us to map in part of the file.
	     We record the load commands and process them all later.  */
	  if (__builtin_expect ((ph->p_align & (GLRO(dl_pagesize) - 1)) != 0,
				0))
	    {
	      errstring = N_("ELF load command alignment not page-aligned");
	      goto call_lose;
	    }
	  if (__builtin_expect (((ph->p_vaddr - ph->p_offset)
				 & (ph->p_align - 1)) != 0, 0))
	    {
	      errstring
		= N_("ELF load command address/offset not properly aligned");
	      goto call_lose;
	    }

	  c = &loadcmds[nloadcmds++];
	  c->mapstart = ph->p_vaddr & ~(GLRO(dl_pagesize) - 1);
	  c->mapend = ((ph->p_vaddr + ph->p_filesz + GLRO(dl_pagesize) - 1)
		       & ~(GLRO(dl_pagesize) - 1));
	  c->dataend = ph->p_vaddr + ph->p_filesz;
	  c->allocend = ph->p_vaddr + ph->p_memsz;
	  c->mapoff = ph->p_offset & ~(GLRO(dl_pagesize) - 1);

	  /* Determine whether there is a gap between the last segment
	     and this one.  */
	  if (nloadcmds > 1 && c[-1].mapend != c->mapstart)
	    has_holes = true;

	  /* Optimize a common case.  */
#if (PF_R | PF_W | PF_X) == 7 && (PROT_READ | PROT_WRITE | PROT_EXEC) == 7
	  c->prot = (PF_TO_PROT
		     >> ((ph->p_flags & (PF_R | PF_W | PF_X)) * 4)) & 0xf;
#else
	  c->prot = 0;
	  if (ph->p_flags & PF_R)
	    c->prot |= PROT_READ;
	  if (ph->p_flags & PF_W)
	    c->prot |= PROT_WRITE;
	  if (ph->p_flags & PF_X)
	    c->prot |= PROT_EXEC;
#endif
	  break;

	case PT_TLS:
	  if (ph->p_memsz == 0)
	    /* Nothing to do for an empty segment.  */
	    break;

	  l->l_tls_blocksize = ph->p_memsz;
	  l->l_tls_align = ph->p_align;
	  if (ph->p_align == 0)
	    l->l_tls_firstbyte_offset = 0;
	  else
	    l->l_tls_firstbyte_offset = ph->p_vaddr & (ph->p_align - 1);
	  l->l_tls_initimage_size = ph->p_filesz;
	  /* Since we don't know the load address yet only store the
	     offset.  We will adjust it later.  */
	  l->l_tls_initimage = (void *) ph->p_vaddr;

	  /* If not loading the initial set of shared libraries,
	     check whether we should permit loading a TLS segment.  */
	  if (__builtin_expect (l->l_type == lt_library, 1)
	      /* If GL(dl_tls_dtv_slotinfo_list) == NULL, then rtld.c did
		 not set up TLS data structures, so don't use them now.  */
	      || __builtin_expect (GL(dl_tls_dtv_slotinfo_list) != NULL, 1))
	    {
	      /* Assign the next available module ID.  */
	      l->l_tls_modid = _dl_next_tls_modid ();
	      break;
	    }

#ifdef SHARED
	  if (l->l_prev == NULL || (mode & __RTLD_AUDIT) != 0)
	    /* We are loading the executable itself when the dynamic linker
	       was executed directly.  The setup will happen later.  */
	    break;

# ifdef _LIBC_REENTRANT
	  /* In a static binary there is no way to tell if we dynamically
	     loaded libpthread.  */
	  if (GL(dl_error_catch_tsd) == &_dl_initial_error_catch_tsd)
# endif
#endif
	    {
	      /* We have not yet loaded libpthread.
		 We can do the TLS setup right now!  */

	      void *tcb;

	      /* The first call allocates TLS bookkeeping data structures.
		 Then we allocate the TCB for the initial thread.  */
	      if (__builtin_expect (_dl_tls_setup (), 0)
		  || __builtin_expect ((tcb = _dl_allocate_tls (NULL)) == NULL,
				       0))
		{
		  errval = ENOMEM;
		  errstring = N_("\
cannot allocate TLS data structures for initial thread");
		  goto call_lose;
		}

	      /* Now we install the TCB in the thread register.  */
	      errstring = TLS_INIT_TP (tcb, 0);
	      if (__builtin_expect (errstring == NULL, 1))
		{
		  /* Now we are all good.  */
		  l->l_tls_modid = ++GL(dl_tls_max_dtv_idx);
		  break;
		}

	      /* The kernel is too old or somesuch.  */
	      errval = 0;
	      _dl_deallocate_tls (tcb, 1);
	      goto call_lose;
	    }

	  /* Uh-oh, the binary expects TLS support but we cannot
	     provide it.  */
	  errval = 0;
	  errstring = N_("cannot handle TLS data");
	  goto call_lose;
	  break;

	case PT_GNU_STACK:
	  stack_flags = ph->p_flags;
	  break;

	case PT_GNU_RELRO:
	  l->l_relro_addr = ph->p_vaddr;
	  l->l_relro_size = ph->p_memsz;
	  break;
	}

    if (__builtin_expect (nloadcmds == 0, 0))
      {
	/* This only happens for a bogus object that will be caught with
	   another error below.  But we don't want to go through the
	   calculations below using NLOADCMDS - 1.  */
	errstring = N_("object file has no loadable segments");
	goto call_lose;
      }

    /* Now process the load commands and map segments into memory.  */
    c = loadcmds;

    /* Length of the sections to be loaded.  */
    maplength = loadcmds[nloadcmds - 1].allocend - c->mapstart;

    if (__builtin_expect (type, ET_DYN) == ET_DYN)
      {
	/* This is a position-independent shared object.  We can let the
	   kernel map it anywhere it likes, but we must have space for all
	   the segments in their specified positions relative to the first.
	   So we map the first segment without MAP_FIXED, but with its
	   extent increased to cover all the segments.  Then we remove
	   access from excess portion, and there is known sufficient space
	   there to remap from the later segments.

	   As a refinement, sometimes we have an address that we would
	   prefer to map such objects at; but this is only a preference,
	   the OS can do whatever it likes. */
	ElfW(Addr) mappref;
	mappref = (ELF_PREFERRED_ADDRESS (loader, maplength,
					  c->mapstart & GLRO(dl_use_load_bias))
		   - MAP_BASE_ADDR (l));

	/* Remember which part of the address space this object uses.  */
	l->l_map_start = (ElfW(Addr)) __mmap ((void *) mappref, maplength,
					      c->prot,
					      MAP_COPY|MAP_FILE,
					      fd, c->mapoff);
	if (__builtin_expect ((void *) l->l_map_start == MAP_FAILED, 0))
	  {
	  map_error:
	    errstring = N_("failed to map segment from shared object");
	    goto call_lose_errno;
	  }

	l->l_map_end = l->l_map_start + maplength;
	l->l_addr = l->l_map_start - c->mapstart;

	if (has_holes)
	  /* Change protection on the excess portion to disallow all access;
	     the portions we do not remap later will be inaccessible as if
	     unallocated.  Then jump into the normal segment-mapping loop to
	     handle the portion of the segment past the end of the file
	     mapping.  */
	  __mprotect ((caddr_t) (l->l_addr + c->mapend),
		      loadcmds[nloadcmds - 1].mapstart - c->mapend,
		      PROT_NONE);

	l->l_contiguous = 1;

	goto postmap;
      }

    /* This object is loaded at a fixed address.  This must never
       happen for objects loaded with dlopen().  */
    if (__builtin_expect ((mode & __RTLD_OPENEXEC) == 0, 0))
      {
	errstring = N_("cannot dynamically load executable");
	goto call_lose;
      }

    /* Notify ELF_PREFERRED_ADDRESS that we have to load this one
       fixed.  */
    ELF_FIXED_ADDRESS (loader, c->mapstart);


    /* Remember which part of the address space this object uses.  */
    l->l_map_start = c->mapstart + l->l_addr;
    l->l_map_end = l->l_map_start + maplength;
    l->l_contiguous = !has_holes;

    while (c < &loadcmds[nloadcmds])
      {
	if (c->mapend > c->mapstart
	    /* Map the segment contents from the file.  */
	    && (__mmap ((void *) (l->l_addr + c->mapstart),
			c->mapend - c->mapstart, c->prot,
			MAP_FIXED|MAP_COPY|MAP_FILE,
			fd, c->mapoff)
		== MAP_FAILED))
	  goto map_error;

      postmap:
	if (c->prot & PROT_EXEC)
	  l->l_text_end = l->l_addr + c->mapend;

	if (l->l_phdr == 0
	    && c->mapoff <= header->e_phoff
	    && ((size_t) (c->mapend - c->mapstart + c->mapoff)
		>= header->e_phoff + header->e_phnum * sizeof (ElfW(Phdr))))
	  /* Found the program header in this segment.  */
	  l->l_phdr = (void *) (uintptr_t) (c->mapstart + header->e_phoff
					    - c->mapoff);

	if (c->allocend > c->dataend)
	  {
	    /* Extra zero pages should appear at the end of this segment,
	       after the data mapped from the file.   */
	    ElfW(Addr) zero, zeroend, zeropage;

	    zero = l->l_addr + c->dataend;
	    zeroend = l->l_addr + c->allocend;
	    zeropage = ((zero + GLRO(dl_pagesize) - 1)
			& ~(GLRO(dl_pagesize) - 1));

	    if (zeroend < zeropage)
	      /* All the extra data is in the last page of the segment.
		 We can just zero it.  */
	      zeropage = zeroend;

	    if (zeropage > zero)
	      {
		/* Zero the final part of the last page of the segment.  */
		if (__builtin_expect ((c->prot & PROT_WRITE) == 0, 0))
		  {
		    /* Dag nab it.  */
		    if (__mprotect ((caddr_t) (zero
					       & ~(GLRO(dl_pagesize) - 1)),
				    GLRO(dl_pagesize), c->prot|PROT_WRITE) < 0)
		      {
			errstring = N_("cannot change memory protections");
			goto call_lose_errno;
		      }
		  }
		memset ((void *) zero, '\0', zeropage - zero);
		if (__builtin_expect ((c->prot & PROT_WRITE) == 0, 0))
		  __mprotect ((caddr_t) (zero & ~(GLRO(dl_pagesize) - 1)),
			      GLRO(dl_pagesize), c->prot);
	      }

	    if (zeroend > zeropage)
	      {
		/* Map the remaining zero pages in from the zero fill FD.  */
		caddr_t mapat;
		mapat = __mmap ((caddr_t) zeropage, zeroend - zeropage,
				c->prot, MAP_ANON|MAP_PRIVATE|MAP_FIXED,
				-1, 0);
		if (__builtin_expect (mapat == MAP_FAILED, 0))
		  {
		    errstring = N_("cannot map zero-fill pages");
		    goto call_lose_errno;
		  }
	      }
	  }

	++c;
      }
  }

  if (l->l_ld == 0)
    {
      if (__builtin_expect (type == ET_DYN, 0))
	{
	  errstring = N_("object file has no dynamic section");
	  goto call_lose;
	}
    }
  else
    l->l_ld = (ElfW(Dyn) *) ((ElfW(Addr)) l->l_ld + l->l_addr);

  elf_get_dynamic_info (l, NULL);

  /* Make sure we are not dlopen'ing an object that has the
     DF_1_NOOPEN flag set.  */
  if (__builtin_expect (l->l_flags_1 & DF_1_NOOPEN, 0)
      && (mode & __RTLD_DLOPEN))
    {
      /* We are not supposed to load this object.  Free all resources.  */
      __munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start);

      if (!l->l_libname->dont_free)
	free (l->l_libname);

      if (l->l_phdr_allocated)
	free ((void *) l->l_phdr);

      errstring = N_("shared object cannot be dlopen()ed");
      goto call_lose;
    }

  if (l->l_phdr == NULL)
    {
      /* The program header is not contained in any of the segments.
	 We have to allocate memory ourself and copy it over from out
	 temporary place.  */
      ElfW(Phdr) *newp = (ElfW(Phdr) *) malloc (header->e_phnum
						* sizeof (ElfW(Phdr)));
      if (newp == NULL)
	{
	  errstring = N_("cannot allocate memory for program header");
	  goto call_lose_errno;
	}

      l->l_phdr = memcpy (newp, phdr,
			  (header->e_phnum * sizeof (ElfW(Phdr))));
      l->l_phdr_allocated = 1;
    }
  else
    /* Adjust the PT_PHDR value by the runtime load address.  */
    l->l_phdr = (ElfW(Phdr) *) ((ElfW(Addr)) l->l_phdr + l->l_addr);

  if (__builtin_expect ((stack_flags &~ GL(dl_stack_flags)) & PF_X, 0))
    {
      if (__builtin_expect (__check_caller (RETURN_ADDRESS (0), allow_ldso),
			    0) != 0)
	{
	  errstring = N_("invalid caller");
	  goto call_lose;
	}

      /* The stack is presently not executable, but this module
	 requires that it be executable.  We must change the
	 protection of the variable which contains the flags used in
	 the mprotect calls.  */
#ifdef SHARED
      if ((mode & (__RTLD_DLOPEN | __RTLD_AUDIT)) == __RTLD_DLOPEN)
	{
	  const uintptr_t p = (uintptr_t) &__stack_prot & -GLRO(dl_pagesize);
	  const size_t s = (uintptr_t) (&__stack_prot + 1) - p;

	  struct link_map *const m = &GL(dl_rtld_map);
	  const uintptr_t relro_end = ((m->l_addr + m->l_relro_addr
					+ m->l_relro_size)
				       & -GLRO(dl_pagesize));
	  if (__builtin_expect (p + s <= relro_end, 1))
	    {
	      /* The variable lies in the region protected by RELRO.  */
	      if (__mprotect ((void *) p, s, PROT_READ|PROT_WRITE) < 0)
		{
		  errstring = N_("cannot change memory protections");
		  goto call_lose_errno;
		}
	      __stack_prot |= PROT_READ|PROT_WRITE|PROT_EXEC;
	      __mprotect ((void *) p, s, PROT_READ);
	    }
	  else
	    __stack_prot |= PROT_READ|PROT_WRITE|PROT_EXEC;
	}
      else
#endif
	__stack_prot |= PROT_READ|PROT_WRITE|PROT_EXEC;

#ifdef check_consistency
      check_consistency ();
#endif

      errval = (*GL(dl_make_stack_executable_hook)) (stack_endp);
      if (errval)
	{
	  errstring = N_("\
cannot enable executable stack as shared object requires");
	  goto call_lose;
	}
    }

  /* Adjust the address of the TLS initialization image.  */
  if (l->l_tls_initimage != NULL)
    l->l_tls_initimage = (char *) l->l_tls_initimage + l->l_addr;

  /* We are done mapping in the file.  We no longer need the descriptor.  */
  if (__builtin_expect (__close (fd) != 0, 0))
    {
      errstring = N_("cannot close file descriptor");
      goto call_lose_errno;
    }
  /* Signal that we closed the file.  */
  fd = -1;

  if (l->l_type == lt_library && type == ET_EXEC)
    l->l_type = lt_executable;

  l->l_entry += l->l_addr;

  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0))
    _dl_debug_printf ("\
  dynamic: 0x%0*lx  base: 0x%0*lx   size: 0x%0*Zx\n\
    entry: 0x%0*lx  phdr: 0x%0*lx  phnum:   %*u\n\n",
			   (int) sizeof (void *) * 2,
			   (unsigned long int) l->l_ld,
			   (int) sizeof (void *) * 2,
			   (unsigned long int) l->l_addr,
			   (int) sizeof (void *) * 2, maplength,
			   (int) sizeof (void *) * 2,
			   (unsigned long int) l->l_entry,
			   (int) sizeof (void *) * 2,
			   (unsigned long int) l->l_phdr,
			   (int) sizeof (void *) * 2, l->l_phnum);

  /* Set up the symbol hash table.  */
  _dl_setup_hash (l);

  /* If this object has DT_SYMBOLIC set modify now its scope.  We don't
     have to do this for the main map.  */
  if ((mode & RTLD_DEEPBIND) == 0
      && __builtin_expect (l->l_info[DT_SYMBOLIC] != NULL, 0)
      && &l->l_searchlist != l->l_scope[0])
    {
      /* Create an appropriate searchlist.  It contains only this map.
	 This is the definition of DT_SYMBOLIC in SysVr4.  */
      l->l_symbolic_searchlist.r_list[0] = l;
      l->l_symbolic_searchlist.r_nlist = 1;

      /* Now move the existing entries one back.  */
      memmove (&l->l_scope[1], &l->l_scope[0],
	       (l->l_scope_max - 1) * sizeof (l->l_scope[0]));

      /* Now add the new entry.  */
      l->l_scope[0] = &l->l_symbolic_searchlist;
    }

  /* Remember whether this object must be initialized first.  */
  if (l->l_flags_1 & DF_1_INITFIRST)
    GL(dl_initfirst) = l;

  /* Finally the file information.  */
  l->l_dev = st.st_dev;
  l->l_ino = st.st_ino;

  /* When we profile the SONAME might be needed for something else but
     loading.  Add it right away.  */
  if (__builtin_expect (GLRO(dl_profile) != NULL, 0)
      && l->l_info[DT_SONAME] != NULL)
    add_name_to_object (l, ((const char *) D_PTR (l, l_info[DT_STRTAB])
			    + l->l_info[DT_SONAME]->d_un.d_val));

#ifdef DL_AFTER_LOAD
  DL_AFTER_LOAD (l);
#endif

  /* Now that the object is fully initialized add it to the object list.  */
  _dl_add_to_namespace_list (l, nsid);

#ifdef SHARED
  /* Auditing checkpoint: we have a new object.  */
  if (__builtin_expect (GLRO(dl_naudit) > 0, 0)
      && !GL(dl_ns)[l->l_ns]._ns_loaded->l_auditing)
    {
      struct audit_ifaces *afct = GLRO(dl_audit);
      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
	{
	  if (afct->objopen != NULL)
	    {
	      l->l_audit[cnt].bindflags
		= afct->objopen (l, nsid, &l->l_audit[cnt].cookie);

	      l->l_audit_any_plt |= l->l_audit[cnt].bindflags != 0;
	    }

	  afct = afct->next;
	}
    }
#endif

  return l;
}

/* Print search path.  */
static void
print_search_path (struct r_search_path_elem **list,
		   const char *what, const char *name)
{
  char buf[max_dirnamelen + max_capstrlen];
  int first = 1;

  _dl_debug_printf (" search path=");

  while (*list != NULL && (*list)->what == what) /* Yes, ==.  */
    {
      char *endp = __mempcpy (buf, (*list)->dirname, (*list)->dirnamelen);
      size_t cnt;

      for (cnt = 0; cnt < ncapstr; ++cnt)
	if ((*list)->status[cnt] != nonexisting)
	  {
	    char *cp = __mempcpy (endp, capstr[cnt].str, capstr[cnt].len);
	    if (cp == buf || (cp == buf + 1 && buf[0] == '/'))
	      cp[0] = '\0';
	    else
	      cp[-1] = '\0';

	    _dl_debug_printf_c (first ? "%s" : ":%s", buf);
	    first = 0;
	  }

      ++list;
    }

  if (name != NULL)
    _dl_debug_printf_c ("\t\t(%s from file %s)\n", what,
			DSO_FILENAME (name));
  else
    _dl_debug_printf_c ("\t\t(%s)\n", what);
}

/* Open a file and verify it is an ELF file for this architecture.  We
   ignore only ELF files for other architectures.  Non-ELF files and
   ELF files with different header information cause fatal errors since
   this could mean there is something wrong in the installation and the
   user might want to know about this.  */
static int
open_verify (const char *name, struct filebuf *fbp, struct link_map *loader,
	     int whatcode, bool *found_other_class, bool free_name)
{
  /* This is the expected ELF header.  */
#define ELF32_CLASS ELFCLASS32
#define ELF64_CLASS ELFCLASS64
#ifndef VALID_ELF_HEADER
# define VALID_ELF_HEADER(hdr,exp,size)	(memcmp (hdr, exp, size) == 0)
# define VALID_ELF_OSABI(osabi)		(osabi == ELFOSABI_SYSV)
# define VALID_ELF_ABIVERSION(osabi,ver) (ver == 0)
#elif defined MORE_ELF_HEADER_DATA
  MORE_ELF_HEADER_DATA;
#endif
  static const unsigned char expected[EI_NIDENT] =
  {
    [EI_MAG0] = ELFMAG0,
    [EI_MAG1] = ELFMAG1,
    [EI_MAG2] = ELFMAG2,
    [EI_MAG3] = ELFMAG3,
    [EI_CLASS] = ELFW(CLASS),
    [EI_DATA] = byteorder,
    [EI_VERSION] = EV_CURRENT,
    [EI_OSABI] = ELFOSABI_SYSV,
    [EI_ABIVERSION] = 0
  };
  static const struct
  {
    ElfW(Word) vendorlen;
    ElfW(Word) datalen;
    ElfW(Word) type;
    char vendor[4];
  } expected_note = { 4, 16, 1, "GNU" };
  /* Initialize it to make the compiler happy.  */
  const char *errstring = NULL;
  int errval = 0;

#ifdef SHARED
  /* Give the auditing libraries a chance.  */
  if (__builtin_expect (GLRO(dl_naudit) > 0, 0) && whatcode != 0
      && loader->l_auditing == 0)
    {
      struct audit_ifaces *afct = GLRO(dl_audit);
      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
	{
	  if (afct->objsearch != NULL)
	    {
	      name = afct->objsearch (name, &loader->l_audit[cnt].cookie,
				      whatcode);
	      if (name == NULL)
		/* Ignore the path.  */
		return -1;
	    }

	  afct = afct->next;
	}
    }
#endif

  /* Open the file.  We always open files read-only.  */
  int fd = __open (name, O_RDONLY | O_CLOEXEC);
  if (fd != -1)
    {
      ElfW(Ehdr) *ehdr;
      ElfW(Phdr) *phdr, *ph;
      ElfW(Word) *abi_note;
      unsigned int osversion;
      size_t maplength;

      /* We successfully opened the file.  Now verify it is a file
	 we can use.  */
      __set_errno (0);
      fbp->len = 0;
      assert (sizeof (fbp->buf) > sizeof (ElfW(Ehdr)));
      /* Read in the header.  */
      do
        {
          ssize_t retlen = __libc_read (fd, fbp->buf + fbp->len,
					sizeof (fbp->buf) - fbp->len);
	  if (retlen <= 0)
	    break;
	  fbp->len += retlen;
	}
      while (__builtin_expect (fbp->len < sizeof (ElfW(Ehdr)), 0));

      /* This is where the ELF header is loaded.  */
      ehdr = (ElfW(Ehdr) *) fbp->buf;

      /* Now run the tests.  */
      if (__builtin_expect (fbp->len < (ssize_t) sizeof (ElfW(Ehdr)), 0))
	{
	  errval = errno;
	  errstring = (errval == 0
		       ? N_("file too short") : N_("cannot read file data"));
	call_lose:
	  if (free_name)
	    {
	      char *realname = (char *) name;
	      name = strdupa (realname);
	      free (realname);
	    }
	  lose (errval, fd, name, NULL, NULL, errstring, NULL, 0);
	}

      /* See whether the ELF header is what we expect.  */
      if (__builtin_expect (! VALID_ELF_HEADER (ehdr->e_ident, expected,
						EI_ABIVERSION)
			    || !VALID_ELF_ABIVERSION (ehdr->e_ident[EI_OSABI],
						      ehdr->e_ident[EI_ABIVERSION])
			    || memcmp (&ehdr->e_ident[EI_PAD],
				       &expected[EI_PAD],
				       EI_NIDENT - EI_PAD) != 0,
			    0))
	{
	  /* Something is wrong.  */
	  const Elf32_Word *magp = (const void *) ehdr->e_ident;
	  if (*magp !=
#if BYTE_ORDER == LITTLE_ENDIAN
	      ((ELFMAG0 << (EI_MAG0 * 8)) |
	       (ELFMAG1 << (EI_MAG1 * 8)) |
	       (ELFMAG2 << (EI_MAG2 * 8)) |
	       (ELFMAG3 << (EI_MAG3 * 8)))
#else
	      ((ELFMAG0 << (EI_MAG3 * 8)) |
	       (ELFMAG1 << (EI_MAG2 * 8)) |
	       (ELFMAG2 << (EI_MAG1 * 8)) |
	       (ELFMAG3 << (EI_MAG0 * 8)))
#endif
	      )
	    errstring = N_("invalid ELF header");
	  else if (ehdr->e_ident[EI_CLASS] != ELFW(CLASS))
	    {
	      /* This is not a fatal error.  On architectures where
		 32-bit and 64-bit binaries can be run this might
		 happen.  */
	      *found_other_class = true;
	      goto close_and_out;
	    }
	  else if (ehdr->e_ident[EI_DATA] != byteorder)
	    {
	      if (BYTE_ORDER == BIG_ENDIAN)
		errstring = N_("ELF file data encoding not big-endian");
	      else
		errstring = N_("ELF file data encoding not little-endian");
	    }
	  else if (ehdr->e_ident[EI_VERSION] != EV_CURRENT)
	    errstring
	      = N_("ELF file version ident does not match current one");
	  /* XXX We should be able so set system specific versions which are
	     allowed here.  */
	  else if (!VALID_ELF_OSABI (ehdr->e_ident[EI_OSABI]))
	    errstring = N_("ELF file OS ABI invalid");
	  else if (!VALID_ELF_ABIVERSION (ehdr->e_ident[EI_OSABI],
					  ehdr->e_ident[EI_ABIVERSION]))
	    errstring = N_("ELF file ABI version invalid");
	  else if (memcmp (&ehdr->e_ident[EI_PAD], &expected[EI_PAD],
			   EI_NIDENT - EI_PAD) != 0)
	    errstring = N_("nonzero padding in e_ident");
	  else
	    /* Otherwise we don't know what went wrong.  */
	    errstring = N_("internal error");

	  goto call_lose;
	}

      if (__builtin_expect (ehdr->e_version, EV_CURRENT) != EV_CURRENT)
	{
	  errstring = N_("ELF file version does not match current one");
	  goto call_lose;
	}
      if (! __builtin_expect (elf_machine_matches_host (ehdr), 1))
	goto close_and_out;
      else if (__builtin_expect (ehdr->e_type, ET_DYN) != ET_DYN
	       && __builtin_expect (ehdr->e_type, ET_EXEC) != ET_EXEC)
	{
	  errstring = N_("only ET_DYN and ET_EXEC can be loaded");
	  goto call_lose;
	}
      else if (__builtin_expect (ehdr->e_phentsize, sizeof (ElfW(Phdr)))
	       != sizeof (ElfW(Phdr)))
	{
	  errstring = N_("ELF file's phentsize not the expected size");
	  goto call_lose;
	}

      maplength = ehdr->e_phnum * sizeof (ElfW(Phdr));
      if (ehdr->e_phoff + maplength <= (size_t) fbp->len)
	phdr = (void *) (fbp->buf + ehdr->e_phoff);
      else
	{
	  phdr = alloca (maplength);
	  __lseek (fd, ehdr->e_phoff, SEEK_SET);
	  if ((size_t) __libc_read (fd, (void *) phdr, maplength) != maplength)
	    {
	    read_error:
	      errval = errno;
	      errstring = N_("cannot read file data");
	      goto call_lose;
	    }
	}

      /* Check .note.ABI-tag if present.  */
      for (ph = phdr; ph < &phdr[ehdr->e_phnum]; ++ph)
	if (ph->p_type == PT_NOTE && ph->p_filesz >= 32 && ph->p_align >= 4)
	  {
	    ElfW(Addr) size = ph->p_filesz;

	    if (ph->p_offset + size <= (size_t) fbp->len)
	      abi_note = (void *) (fbp->buf + ph->p_offset);
	    else
	      {
		abi_note = alloca (size);
		__lseek (fd, ph->p_offset, SEEK_SET);
		if (__libc_read (fd, (void *) abi_note, size) != size)
		  goto read_error;
	      }

	    while (memcmp (abi_note, &expected_note, sizeof (expected_note)))
	      {
#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word)))
		ElfW(Addr) note_size = 3 * sizeof (ElfW(Word))
				       + ROUND (abi_note[0])
				       + ROUND (abi_note[1]);

		if (size - 32 < note_size)
		  {
		    size = 0;
		    break;
		  }
		size -= note_size;
		abi_note = (void *) abi_note + note_size;
	      }

	    if (size == 0)
	      continue;

	    osversion = (abi_note[5] & 0xff) * 65536
			+ (abi_note[6] & 0xff) * 256
			+ (abi_note[7] & 0xff);
	    if (abi_note[4] != __ABI_TAG_OS
		|| (GLRO(dl_osversion) && GLRO(dl_osversion) < osversion))
	      {
	      close_and_out:
		__close (fd);
		__set_errno (ENOENT);
		fd = -1;
	      }

	    break;
	  }
    }

  return fd;
}

/* Try to open NAME in one of the directories in *DIRSP.
   Return the fd, or -1.  If successful, fill in *REALNAME
   with the malloc'd full directory name.  If it turns out
   that none of the directories in *DIRSP exists, *DIRSP is
   replaced with (void *) -1, and the old value is free()d
   if MAY_FREE_DIRS is true.  */

static int
open_path (const char *name, size_t namelen, int secure,
	   struct r_search_path_struct *sps, char **realname,
	   struct filebuf *fbp, struct link_map *loader, int whatcode,
	   bool *found_other_class)
{
  struct r_search_path_elem **dirs = sps->dirs;
  char *buf;
  int fd = -1;
  const char *current_what = NULL;
  int any = 0;

  if (__builtin_expect (dirs == NULL, 0))
    /* We're called before _dl_init_paths when loading the main executable
       given on the command line when rtld is run directly.  */
    return -1;

  buf = alloca (max_dirnamelen + max_capstrlen + namelen);
  do
    {
      struct r_search_path_elem *this_dir = *dirs;
      size_t buflen = 0;
      size_t cnt;
      char *edp;
      int here_any = 0;
      int err;

      /* If we are debugging the search for libraries print the path
	 now if it hasn't happened now.  */
      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0)
	  && current_what != this_dir->what)
	{
	  current_what = this_dir->what;
	  print_search_path (dirs, current_what, this_dir->where);
	}

      edp = (char *) __mempcpy (buf, this_dir->dirname, this_dir->dirnamelen);
      for (cnt = 0; fd == -1 && cnt < ncapstr; ++cnt)
	{
	  /* Skip this directory if we know it does not exist.  */
	  if (this_dir->status[cnt] == nonexisting)
	    continue;

	  buflen =
	    ((char *) __mempcpy (__mempcpy (edp, capstr[cnt].str,
					    capstr[cnt].len),
				 name, namelen)
	     - buf);

	  /* Print name we try if this is wanted.  */
	  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0))
	    _dl_debug_printf ("  trying file=%s\n", buf);

	  fd = open_verify (buf, fbp, loader, whatcode, found_other_class,
			    false);
	  if (this_dir->status[cnt] == unknown)
	    {
	      if (fd != -1)
		this_dir->status[cnt] = existing;
	      /* Do not update the directory information when loading
		 auditing code.  We must try to disturb the program as
		 little as possible.  */
	      else if (loader == NULL
		       || GL(dl_ns)[loader->l_ns]._ns_loaded->l_auditing == 0)
		{
		  /* We failed to open machine dependent library.  Let's
		     test whether there is any directory at all.  */
		  struct stat64 st;

		  buf[buflen - namelen - 1] = '\0';

		  if (__xstat64 (_STAT_VER, buf, &st) != 0
		      || ! S_ISDIR (st.st_mode))
		    /* The directory does not exist or it is no directory.  */
		    this_dir->status[cnt] = nonexisting;
		  else
		    this_dir->status[cnt] = existing;
		}
	    }

	  /* Remember whether we found any existing directory.  */
	  here_any |= this_dir->status[cnt] != nonexisting;

	  if (fd != -1 && __builtin_expect (secure, 0)
	      && INTUSE(__libc_enable_secure))
	    {
	      /* This is an extra security effort to make sure nobody can
		 preload broken shared objects which are in the trusted
		 directories and so exploit the bugs.  */
	      struct stat64 st;

	      if (__fxstat64 (_STAT_VER, fd, &st) != 0
		  || (st.st_mode & S_ISUID) == 0)
		{
		  /* The shared object cannot be tested for being SUID
		     or this bit is not set.  In this case we must not
		     use this object.  */
		  __close (fd);
		  fd = -1;
		  /* We simply ignore the file, signal this by setting
		     the error value which would have been set by `open'.  */
		  errno = ENOENT;
		}
	    }
	}

      if (fd != -1)
	{
	  *realname = (char *) malloc (buflen);
	  if (*realname != NULL)
	    {
	      memcpy (*realname, buf, buflen);
	      return fd;
	    }
	  else
	    {
	      /* No memory for the name, we certainly won't be able
		 to load and link it.  */
	      __close (fd);
	      return -1;
	    }
	}
      if (here_any && (err = errno) != ENOENT && err != EACCES)
	/* The file exists and is readable, but something went wrong.  */
	return -1;

      /* Remember whether we found anything.  */
      any |= here_any;
    }
  while (*++dirs != NULL);

  /* Remove the whole path if none of the directories exists.  */
  if (__builtin_expect (! any, 0))
    {
      /* Paths which were allocated using the minimal malloc() in ld.so
	 must not be freed using the general free() in libc.  */
      if (sps->malloced)
	free (sps->dirs);

      /* rtld_search_dirs is attribute_relro, therefore avoid writing
	 into it.  */
      if (sps != &rtld_search_dirs)
	sps->dirs = (void *) -1;
    }

  return -1;
}

/* Map in the shared object file NAME.  */

struct link_map *
internal_function
_dl_map_object (struct link_map *loader, const char *name,
		int type, int trace_mode, int mode, Lmid_t nsid)
{
  int fd;
  char *realname;
  char *name_copy;
  struct link_map *l;
  struct filebuf fb;

  assert (nsid >= 0);
  assert (nsid < GL(dl_nns));

  /* Look for this name among those already loaded.  */
  for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
    {
      /* If the requested name matches the soname of a loaded object,
	 use that object.  Elide this check for names that have not
	 yet been opened.  */
      if (__builtin_expect (l->l_faked, 0) != 0
	  || __builtin_expect (l->l_removed, 0) != 0)
	continue;
      if (!_dl_name_match_p (name, l))
	{
	  const char *soname;

	  if (__builtin_expect (l->l_soname_added, 1)
	      || l->l_info[DT_SONAME] == NULL)
	    continue;

	  soname = ((const char *) D_PTR (l, l_info[DT_STRTAB])
		    + l->l_info[DT_SONAME]->d_un.d_val);
	  if (strcmp (name, soname) != 0)
	    continue;

	  /* We have a match on a new name -- cache it.  */
	  add_name_to_object (l, soname);
	  l->l_soname_added = 1;
	}

      /* We have a match.  */
      return l;
    }

  /* Display information if we are debugging.  */
  if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_FILES, 0)
      && loader != NULL)
    _dl_debug_printf ((mode & __RTLD_CALLMAP) == 0
		      ? "\nfile=%s [%lu];  needed by %s [%lu]\n"
		      : "\nfile=%s [%lu];  dynamically loaded by %s [%lu]\n",
		      name, nsid, DSO_FILENAME (loader->l_name), loader->l_ns);

#ifdef SHARED
  /* Give the auditing libraries a chance to change the name before we
     try anything.  */
  if (__builtin_expect (GLRO(dl_naudit) > 0, 0)
      && (loader == NULL || loader->l_auditing == 0))
    {
      struct audit_ifaces *afct = GLRO(dl_audit);
      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
	{
	  if (afct->objsearch != NULL)
	    {
	      name = afct->objsearch (name, &loader->l_audit[cnt].cookie,
				      LA_SER_ORIG);
	      if (name == NULL)
		{
		  /* Do not try anything further.  */
		  fd = -1;
		  goto no_file;
		}
	    }

	  afct = afct->next;
	}
    }
#endif

  /* Will be true if we found a DSO which is of the other ELF class.  */
  bool found_other_class = false;

  if (strchr (name, '/') == NULL)
    {
      /* Search for NAME in several places.  */

      size_t namelen = strlen (name) + 1;

      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0))
	_dl_debug_printf ("find library=%s [%lu]; searching\n", name, nsid);

      fd = -1;

      /* When the object has the RUNPATH information we don't use any
	 RPATHs.  */
      if (loader == NULL || loader->l_info[DT_RUNPATH] == NULL)
	{
	  /* This is the executable's map (if there is one).  Make sure that
	     we do not look at it twice.  */
	  struct link_map *main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
	  bool did_main_map = false;

	  /* First try the DT_RPATH of the dependent object that caused NAME
	     to be loaded.  Then that object's dependent, and on up.  */
	  for (l = loader; l; l = l->l_loader)
	    if (cache_rpath (l, &l->l_rpath_dirs, DT_RPATH, "RPATH"))
	      {
		fd = open_path (name, namelen, mode & __RTLD_SECURE,
				&l->l_rpath_dirs,
				&realname, &fb, loader, LA_SER_RUNPATH,
				&found_other_class);
		if (fd != -1)
		  break;

		did_main_map |= l == main_map;
	      }

	  /* If dynamically linked, try the DT_RPATH of the executable
	     itself.  NB: we do this for lookups in any namespace.  */
	  if (fd == -1 && !did_main_map
	      && main_map != NULL && main_map->l_type != lt_loaded
	      && cache_rpath (main_map, &main_map->l_rpath_dirs, DT_RPATH,
			      "RPATH"))
	    fd = open_path (name, namelen, mode & __RTLD_SECURE,
			    &main_map->l_rpath_dirs,
			    &realname, &fb, loader ?: main_map, LA_SER_RUNPATH,
			    &found_other_class);
	}

      /* Try the LD_LIBRARY_PATH environment variable.  */
      if (fd == -1 && env_path_list.dirs != (void *) -1)
	fd = open_path (name, namelen, mode & __RTLD_SECURE, &env_path_list,
			&realname, &fb,
			loader ?: GL(dl_ns)[LM_ID_BASE]._ns_loaded,
			LA_SER_LIBPATH, &found_other_class);

      /* Look at the RUNPATH information for this binary.  */
      if (fd == -1 && loader != NULL
	  && cache_rpath (loader, &loader->l_runpath_dirs,
			  DT_RUNPATH, "RUNPATH"))
	fd = open_path (name, namelen, mode & __RTLD_SECURE,
			&loader->l_runpath_dirs, &realname, &fb, loader,
			LA_SER_RUNPATH, &found_other_class);

#ifdef USE_LDCONFIG
      if (fd == -1
	  && (__builtin_expect (! (mode & __RTLD_SECURE), 1)
	      || ! INTUSE(__libc_enable_secure))
	  && __builtin_expect (GLRO(dl_inhibit_cache) == 0, 1))
	{
	  /* Check the list of libraries in the file /etc/ld.so.cache,
	     for compatibility with Linux's ldconfig program.  */
	  const char *cached = _dl_load_cache_lookup (name);

	  if (cached != NULL)
	    {
	      // XXX Correct to unconditionally default to namespace 0?
	      l = (loader
		   ?: GL(dl_ns)[LM_ID_BASE]._ns_loaded
# ifdef SHARED
		   ?: &GL(dl_rtld_map)
# endif
		  );

	      /* If the loader has the DF_1_NODEFLIB flag set we must not
		 use a cache entry from any of these directories.  */
	      if (__builtin_expect (l->l_flags_1 & DF_1_NODEFLIB, 0))
		{
		  const char *dirp = system_dirs;
		  unsigned int cnt = 0;

		  do
		    {
		      if (memcmp (cached, dirp, system_dirs_len[cnt]) == 0)
			{
			  /* The prefix matches.  Don't use the entry.  */
			  cached = NULL;
			  break;
			}

		      dirp += system_dirs_len[cnt] + 1;
		      ++cnt;
		    }
		  while (cnt < nsystem_dirs_len);
		}

	      if (cached != NULL)
		{
		  fd = open_verify (cached,
				    &fb, loader ?: GL(dl_ns)[nsid]._ns_loaded,
				    LA_SER_CONFIG, &found_other_class, false);
		  if (__builtin_expect (fd != -1, 1))
		    {
		      realname = local_strdup (cached);
		      if (realname == NULL)
			{
			  __close (fd);
			  fd = -1;
			}
		    }
		}
	    }
	}
#endif

      /* Finally, try the default path.  */
      if (fd == -1
	  && ((l = loader ?: GL(dl_ns)[nsid]._ns_loaded) == NULL
	      || __builtin_expect (!(l->l_flags_1 & DF_1_NODEFLIB), 1))
	  && rtld_search_dirs.dirs != (void *) -1)
	fd = open_path (name, namelen, mode & __RTLD_SECURE, &rtld_search_dirs,
			&realname, &fb, l, LA_SER_DEFAULT, &found_other_class);

      /* Add another newline when we are tracing the library loading.  */
      if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_LIBS, 0))
	_dl_debug_printf ("\n");
    }
  else
    {
      /* The path may contain dynamic string tokens.  */
      realname = (loader
		  ? expand_dynamic_string_token (loader, name, 0)
		  : local_strdup (name));
      if (realname == NULL)
	fd = -1;
      else
	{
	  fd = open_verify (realname, &fb,
			    loader ?: GL(dl_ns)[nsid]._ns_loaded, 0,
			    &found_other_class, true);
	  if (__builtin_expect (fd, 0) == -1)
	    free (realname);
	}
    }

#ifdef SHARED
 no_file:
#endif
  /* In case the LOADER information has only been provided to get to
     the appropriate RUNPATH/RPATH information we do not need it
     anymore.  */
  if (mode & __RTLD_CALLMAP)
    loader = NULL;

  if (__builtin_expect (fd, 0) == -1)
    {
      if (trace_mode
	  && __builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_PRELINK, 0) == 0)
	{
	  /* We haven't found an appropriate library.  But since we
	     are only interested in the list of libraries this isn't
	     so severe.  Fake an entry with all the information we
	     have.  */
	  static const Elf_Symndx dummy_bucket = STN_UNDEF;

	  /* Allocate a new object map.  */
	  if ((name_copy = local_strdup (name)) == NULL
	      || (l = _dl_new_object (name_copy, name, type, loader,
				      mode, nsid)) == NULL)
	    {
	      free (name_copy);
	      _dl_signal_error (ENOMEM, name, NULL,
				N_("cannot create shared object descriptor"));
	    }
	  /* Signal that this is a faked entry.  */
	  l->l_faked = 1;
	  /* Since the descriptor is initialized with zero we do not
	     have do this here.
	  l->l_reserved = 0; */
	  l->l_buckets = &dummy_bucket;
	  l->l_nbuckets = 1;
	  l->l_relocated = 1;

	  /* Enter the object in the object list.  */
	  _dl_add_to_namespace_list (l, nsid);

	  return l;
	}
      else if (found_other_class)
	_dl_signal_error (0, name, NULL,
			  ELFW(CLASS) == ELFCLASS32
			  ? N_("wrong ELF class: ELFCLASS64")
			  : N_("wrong ELF class: ELFCLASS32"));
      else
	_dl_signal_error (errno, name, NULL,
			  N_("cannot open shared object file"));
    }

  void *stack_end = __libc_stack_end;
  return _dl_map_object_from_fd (name, fd, &fb, realname, loader, type, mode,
				 &stack_end, nsid);
}


void
internal_function
_dl_rtld_di_serinfo (struct link_map *loader, Dl_serinfo *si, bool counting)
{
  if (counting)
    {
      si->dls_cnt = 0;
      si->dls_size = 0;
    }

  unsigned int idx = 0;
  char *allocptr = (char *) &si->dls_serpath[si->dls_cnt];
  void add_path (const struct r_search_path_struct *sps, unsigned int flags)
# define add_path(sps, flags) add_path(sps, 0) /* XXX */
    {
      if (sps->dirs != (void *) -1)
	{
	  struct r_search_path_elem **dirs = sps->dirs;
	  do
	    {
	      const struct r_search_path_elem *const r = *dirs++;
	      if (counting)
		{
		  si->dls_cnt++;
		  si->dls_size += MAX (2, r->dirnamelen);
		}
	      else
		{
		  Dl_serpath *const sp = &si->dls_serpath[idx++];
		  sp->dls_name = allocptr;
		  if (r->dirnamelen < 2)
		    *allocptr++ = r->dirnamelen ? '/' : '.';
		  else
		    allocptr = __mempcpy (allocptr,
					  r->dirname, r->dirnamelen - 1);
		  *allocptr++ = '\0';
		  sp->dls_flags = flags;
		}
	    }
	  while (*dirs != NULL);
	}
    }

  /* When the object has the RUNPATH information we don't use any RPATHs.  */
  if (loader->l_info[DT_RUNPATH] == NULL)
    {
      /* First try the DT_RPATH of the dependent object that caused NAME
	 to be loaded.  Then that object's dependent, and on up.  */

      struct link_map *l = loader;
      do
	{
	  if (cache_rpath (l, &l->l_rpath_dirs, DT_RPATH, "RPATH"))
	    add_path (&l->l_rpath_dirs, XXX_RPATH);
	  l = l->l_loader;
	}
      while (l != NULL);

      /* If dynamically linked, try the DT_RPATH of the executable itself.  */
      if (loader->l_ns == LM_ID_BASE)
	{
	  l = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
	  if (l != NULL && l->l_type != lt_loaded && l != loader)
	    if (cache_rpath (l, &l->l_rpath_dirs, DT_RPATH, "RPATH"))
	      add_path (&l->l_rpath_dirs, XXX_RPATH);
	}
    }

  /* Try the LD_LIBRARY_PATH environment variable.  */
  add_path (&env_path_list, XXX_ENV);

  /* Look at the RUNPATH information for this binary.  */
  if (cache_rpath (loader, &loader->l_runpath_dirs, DT_RUNPATH, "RUNPATH"))
    add_path (&loader->l_runpath_dirs, XXX_RUNPATH);

  /* XXX
     Here is where ld.so.cache gets checked, but we don't have
     a way to indicate that in the results for Dl_serinfo.  */

  /* Finally, try the default path.  */
  if (!(loader->l_flags_1 & DF_1_NODEFLIB))
    add_path (&rtld_search_dirs, XXX_default);

  if (counting)
    /* Count the struct size before the string area, which we didn't
       know before we completed dls_cnt.  */
    si->dls_size += (char *) &si->dls_serpath[si->dls_cnt] - (char *) si;
}