summaryrefslogtreecommitdiffstats
path: root/security/apparmor/lsm.c
blob: 42446a216f3bcfccfe2b0f099f4fa044c1efe6da (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
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
/*
 * AppArmor security module
 *
 * This file contains AppArmor LSM hooks.
 *
 * Copyright (C) 1998-2008 Novell/SUSE
 * Copyright 2009-2010 Canonical Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 */

#include <linux/lsm_hooks.h>
#include <linux/moduleparam.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/ptrace.h>
#include <linux/ctype.h>
#include <linux/sysctl.h>
#include <linux/audit.h>
#include <linux/user_namespace.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <net/sock.h>

#include "include/apparmor.h"
#include "include/apparmorfs.h"
#include "include/audit.h"
#include "include/capability.h"
#include "include/cred.h"
#include "include/file.h"
#include "include/ipc.h"
#include "include/net.h"
#include "include/path.h"
#include "include/label.h"
#include "include/policy.h"
#include "include/policy_ns.h"
#include "include/procattr.h"
#include "include/mount.h"
#include "include/secid.h"

/* Flag indicating whether initialization completed */
int apparmor_initialized;

DEFINE_PER_CPU(struct aa_buffers, aa_buffers);


/*
 * LSM hook functions
 */

/*
 * put the associated labels
 */
static void apparmor_cred_free(struct cred *cred)
{
	aa_put_label(cred_label(cred));
	cred_label(cred) = NULL;
}

/*
 * allocate the apparmor part of blank credentials
 */
static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
	cred_label(cred) = NULL;
	return 0;
}

/*
 * prepare new cred label for modification by prepare_cred block
 */
static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
				 gfp_t gfp)
{
	cred_label(new) = aa_get_newest_label(cred_label(old));
	return 0;
}

/*
 * transfer the apparmor data to a blank set of creds
 */
static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
{
	cred_label(new) = aa_get_newest_label(cred_label(old));
}

static void apparmor_task_free(struct task_struct *task)
{

	aa_free_task_ctx(task_ctx(task));
	task_ctx(task) = NULL;
}

static int apparmor_task_alloc(struct task_struct *task,
			       unsigned long clone_flags)
{
	struct aa_task_ctx *new = aa_alloc_task_ctx(GFP_KERNEL);

	if (!new)
		return -ENOMEM;

	aa_dup_task_ctx(new, task_ctx(current));
	task_ctx(task) = new;

	return 0;
}

static int apparmor_ptrace_access_check(struct task_struct *child,
					unsigned int mode)
{
	struct aa_label *tracer, *tracee;
	int error;

	tracer = __begin_current_label_crit_section();
	tracee = aa_get_task_label(child);
	error = aa_may_ptrace(tracer, tracee,
			(mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
						  : AA_PTRACE_TRACE);
	aa_put_label(tracee);
	__end_current_label_crit_section(tracer);

	return error;
}

static int apparmor_ptrace_traceme(struct task_struct *parent)
{
	struct aa_label *tracer, *tracee;
	int error;

	tracee = __begin_current_label_crit_section();
	tracer = aa_get_task_label(parent);
	error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
	aa_put_label(tracer);
	__end_current_label_crit_section(tracee);

	return error;
}

/* Derived from security/commoncap.c:cap_capget */
static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
			   kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
	struct aa_label *label;
	const struct cred *cred;

	rcu_read_lock();
	cred = __task_cred(target);
	label = aa_get_newest_cred_label(cred);

	/*
	 * cap_capget is stacked ahead of this and will
	 * initialize effective and permitted.
	 */
	if (!unconfined(label)) {
		struct aa_profile *profile;
		struct label_it i;

		label_for_each_confined(i, label, profile) {
			if (COMPLAIN_MODE(profile))
				continue;
			*effective = cap_intersect(*effective,
						   profile->caps.allow);
			*permitted = cap_intersect(*permitted,
						   profile->caps.allow);
		}
	}
	rcu_read_unlock();
	aa_put_label(label);

	return 0;
}

static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
			    int cap, int audit)
{
	struct aa_label *label;
	int error = 0;

	label = aa_get_newest_cred_label(cred);
	if (!unconfined(label))
		error = aa_capable(label, cap, audit);
	aa_put_label(label);

	return error;
}

/**
 * common_perm - basic common permission check wrapper fn for paths
 * @op: operation being checked
 * @path: path to check permission of  (NOT NULL)
 * @mask: requested permissions mask
 * @cond: conditional info for the permission request  (NOT NULL)
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm(const char *op, const struct path *path, u32 mask,
		       struct path_cond *cond)
{
	struct aa_label *label;
	int error = 0;

	label = __begin_current_label_crit_section();
	if (!unconfined(label))
		error = aa_path_perm(op, label, path, 0, mask, cond);
	__end_current_label_crit_section(label);

	return error;
}

/**
 * common_perm_cond - common permission wrapper around inode cond
 * @op: operation being checked
 * @path: location to check (NOT NULL)
 * @mask: requested permissions mask
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_cond(const char *op, const struct path *path, u32 mask)
{
	struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
				  d_backing_inode(path->dentry)->i_mode
	};

	if (!path_mediated_fs(path->dentry))
		return 0;

	return common_perm(op, path, mask, &cond);
}

/**
 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
 * @op: operation being checked
 * @dir: directory of the dentry  (NOT NULL)
 * @dentry: dentry to check  (NOT NULL)
 * @mask: requested permissions mask
 * @cond: conditional info for the permission request  (NOT NULL)
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_dir_dentry(const char *op, const struct path *dir,
				  struct dentry *dentry, u32 mask,
				  struct path_cond *cond)
{
	struct path path = { .mnt = dir->mnt, .dentry = dentry };

	return common_perm(op, &path, mask, cond);
}

/**
 * common_perm_rm - common permission wrapper for operations doing rm
 * @op: operation being checked
 * @dir: directory that the dentry is in  (NOT NULL)
 * @dentry: dentry being rm'd  (NOT NULL)
 * @mask: requested permission mask
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_rm(const char *op, const struct path *dir,
			  struct dentry *dentry, u32 mask)
{
	struct inode *inode = d_backing_inode(dentry);
	struct path_cond cond = { };

	if (!inode || !path_mediated_fs(dentry))
		return 0;

	cond.uid = inode->i_uid;
	cond.mode = inode->i_mode;

	return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
}

/**
 * common_perm_create - common permission wrapper for operations doing create
 * @op: operation being checked
 * @dir: directory that dentry will be created in  (NOT NULL)
 * @dentry: dentry to create   (NOT NULL)
 * @mask: request permission mask
 * @mode: created file mode
 *
 * Returns: %0 else error code if error or permission denied
 */
static int common_perm_create(const char *op, const struct path *dir,
			      struct dentry *dentry, u32 mask, umode_t mode)
{
	struct path_cond cond = { current_fsuid(), mode };

	if (!path_mediated_fs(dir->dentry))
		return 0;

	return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
}

static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
{
	return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
}

static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
			       umode_t mode)
{
	return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
				  S_IFDIR);
}

static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
{
	return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
}

static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
			       umode_t mode, unsigned int dev)
{
	return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
}

static int apparmor_path_truncate(const struct path *path)
{
	return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
}

static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
				 const char *old_name)
{
	return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
				  S_IFLNK);
}

static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
			      struct dentry *new_dentry)
{
	struct aa_label *label;
	int error = 0;

	if (!path_mediated_fs(old_dentry))
		return 0;

	label = begin_current_label_crit_section();
	if (!unconfined(label))
		error = aa_path_link(label, old_dentry, new_dir, new_dentry);
	end_current_label_crit_section(label);

	return error;
}

static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
				const struct path *new_dir, struct dentry *new_dentry)
{
	struct aa_label *label;
	int error = 0;

	if (!path_mediated_fs(old_dentry))
		return 0;

	label = begin_current_label_crit_section();
	if (!unconfined(label)) {
		struct path old_path = { .mnt = old_dir->mnt,
					 .dentry = old_dentry };
		struct path new_path = { .mnt = new_dir->mnt,
					 .dentry = new_dentry };
		struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
					  d_backing_inode(old_dentry)->i_mode
		};

		error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
				     MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
				     AA_MAY_SETATTR | AA_MAY_DELETE,
				     &cond);
		if (!error)
			error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
					     0, MAY_WRITE | AA_MAY_SETATTR |
					     AA_MAY_CREATE, &cond);

	}
	end_current_label_crit_section(label);

	return error;
}

static int apparmor_path_chmod(const struct path *path, umode_t mode)
{
	return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
}

static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
{
	return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
}

static int apparmor_inode_getattr(const struct path *path)
{
	return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
}

static int apparmor_file_open(struct file *file)
{
	struct aa_file_ctx *fctx = file_ctx(file);
	struct aa_label *label;
	int error = 0;

	if (!path_mediated_fs(file->f_path.dentry))
		return 0;

	/* If in exec, permission is handled by bprm hooks.
	 * Cache permissions granted by the previous exec check, with
	 * implicit read and executable mmap which are required to
	 * actually execute the image.
	 */
	if (current->in_execve) {
		fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
		return 0;
	}

	label = aa_get_newest_cred_label(file->f_cred);
	if (!unconfined(label)) {
		struct inode *inode = file_inode(file);
		struct path_cond cond = { inode->i_uid, inode->i_mode };

		error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
				     aa_map_file_to_perms(file), &cond);
		/* todo cache full allowed permissions set and state */
		fctx->allow = aa_map_file_to_perms(file);
	}
	aa_put_label(label);

	return error;
}

static int apparmor_file_alloc_security(struct file *file)
{
	int error = 0;

	/* freed by apparmor_file_free_security */
	struct aa_label *label = begin_current_label_crit_section();
	file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL);
	if (!file_ctx(file))
		error = -ENOMEM;
	end_current_label_crit_section(label);

	return error;
}

static void apparmor_file_free_security(struct file *file)
{
	aa_free_file_ctx(file_ctx(file));
}

static int common_file_perm(const char *op, struct file *file, u32 mask)
{
	struct aa_label *label;
	int error = 0;

	/* don't reaudit files closed during inheritance */
	if (file->f_path.dentry == aa_null.dentry)
		return -EACCES;

	label = __begin_current_label_crit_section();
	error = aa_file_perm(op, label, file, mask);
	__end_current_label_crit_section(label);

	return error;
}

static int apparmor_file_receive(struct file *file)
{
	return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file));
}

static int apparmor_file_permission(struct file *file, int mask)
{
	return common_file_perm(OP_FPERM, file, mask);
}

static int apparmor_file_lock(struct file *file, unsigned int cmd)
{
	u32 mask = AA_MAY_LOCK;

	if (cmd == F_WRLCK)
		mask |= MAY_WRITE;

	return common_file_perm(OP_FLOCK, file, mask);
}

static int common_mmap(const char *op, struct file *file, unsigned long prot,
		       unsigned long flags)
{
	int mask = 0;

	if (!file || !file_ctx(file))
		return 0;

	if (prot & PROT_READ)
		mask |= MAY_READ;
	/*
	 * Private mappings don't require write perms since they don't
	 * write back to the files
	 */
	if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
		mask |= MAY_WRITE;
	if (prot & PROT_EXEC)
		mask |= AA_EXEC_MMAP;

	return common_file_perm(op, file, mask);
}

static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
			      unsigned long prot, unsigned long flags)
{
	return common_mmap(OP_FMMAP, file, prot, flags);
}

static int apparmor_file_mprotect(struct vm_area_struct *vma,
				  unsigned long reqprot, unsigned long prot)
{
	return common_mmap(OP_FMPROT, vma->vm_file, prot,
			   !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
}

static int apparmor_sb_mount(const char *dev_name, const struct path *path,
			     const char *type, unsigned long flags, void *data)
{
	struct aa_label *label;
	int error = 0;

	/* Discard magic */
	if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
		flags &= ~MS_MGC_MSK;

	flags &= ~AA_MS_IGNORE_MASK;

	label = __begin_current_label_crit_section();
	if (!unconfined(label)) {
		if (flags & MS_REMOUNT)
			error = aa_remount(label, path, flags, data);
		else if (flags & MS_BIND)
			error = aa_bind_mount(label, path, dev_name, flags);
		else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
				  MS_UNBINDABLE))
			error = aa_mount_change_type(label, path, flags);
		else if (flags & MS_MOVE)
			error = aa_move_mount(label, path, dev_name);
		else
			error = aa_new_mount(label, dev_name, path, type,
					     flags, data);
	}
	__end_current_label_crit_section(label);

	return error;
}

static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
{
	struct aa_label *label;
	int error = 0;

	label = __begin_current_label_crit_section();
	if (!unconfined(label))
		error = aa_umount(label, mnt, flags);
	__end_current_label_crit_section(label);

	return error;
}

static int apparmor_sb_pivotroot(const struct path *old_path,
				 const struct path *new_path)
{
	struct aa_label *label;
	int error = 0;

	label = aa_get_current_label();
	if (!unconfined(label))
		error = aa_pivotroot(label, old_path, new_path);
	aa_put_label(label);

	return error;
}

static int apparmor_getprocattr(struct task_struct *task, char *name,
				char **value)
{
	int error = -ENOENT;
	/* released below */
	const struct cred *cred = get_task_cred(task);
	struct aa_task_ctx *ctx = task_ctx(current);
	struct aa_label *label = NULL;

	if (strcmp(name, "current") == 0)
		label = aa_get_newest_label(cred_label(cred));
	else if (strcmp(name, "prev") == 0  && ctx->previous)
		label = aa_get_newest_label(ctx->previous);
	else if (strcmp(name, "exec") == 0 && ctx->onexec)
		label = aa_get_newest_label(ctx->onexec);
	else
		error = -EINVAL;

	if (label)
		error = aa_getprocattr(label, value);

	aa_put_label(label);
	put_cred(cred);

	return error;
}

static int apparmor_setprocattr(const char *name, void *value,
				size_t size)
{
	char *command, *largs = NULL, *args = value;
	size_t arg_size;
	int error;
	DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);

	if (size == 0)
		return -EINVAL;

	/* AppArmor requires that the buffer must be null terminated atm */
	if (args[size - 1] != '\0') {
		/* null terminate */
		largs = args = kmalloc(size + 1, GFP_KERNEL);
		if (!args)
			return -ENOMEM;
		memcpy(args, value, size);
		args[size] = '\0';
	}

	error = -EINVAL;
	args = strim(args);
	command = strsep(&args, " ");
	if (!args)
		goto out;
	args = skip_spaces(args);
	if (!*args)
		goto out;

	arg_size = size - (args - (largs ? largs : (char *) value));
	if (strcmp(name, "current") == 0) {
		if (strcmp(command, "changehat") == 0) {
			error = aa_setprocattr_changehat(args, arg_size,
							 AA_CHANGE_NOFLAGS);
		} else if (strcmp(command, "permhat") == 0) {
			error = aa_setprocattr_changehat(args, arg_size,
							 AA_CHANGE_TEST);
		} else if (strcmp(command, "changeprofile") == 0) {
			error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
		} else if (strcmp(command, "permprofile") == 0) {
			error = aa_change_profile(args, AA_CHANGE_TEST);
		} else if (strcmp(command, "stack") == 0) {
			error = aa_change_profile(args, AA_CHANGE_STACK);
		} else
			goto fail;
	} else if (strcmp(name, "exec") == 0) {
		if (strcmp(command, "exec") == 0)
			error = aa_change_profile(args, AA_CHANGE_ONEXEC);
		else if (strcmp(command, "stack") == 0)
			error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
							 AA_CHANGE_STACK));
		else
			goto fail;
	} else
		/* only support the "current" and "exec" process attributes */
		goto fail;

	if (!error)
		error = size;
out:
	kfree(largs);
	return error;

fail:
	aad(&sa)->label = begin_current_label_crit_section();
	aad(&sa)->info = name;
	aad(&sa)->error = error = -EINVAL;
	aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
	end_current_label_crit_section(aad(&sa)->label);
	goto out;
}

/**
 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
 * @bprm: binprm for the exec  (NOT NULL)
 */
static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
{
	struct aa_label *label = aa_current_raw_label();
	struct aa_label *new_label = cred_label(bprm->cred);

	/* bail out if unconfined or not changing profile */
	if ((new_label->proxy == label->proxy) ||
	    (unconfined(new_label)))
		return;

	aa_inherit_files(bprm->cred, current->files);

	current->pdeath_signal = 0;

	/* reset soft limits and set hard limits for the new label */
	__aa_transition_rlimits(label, new_label);
}

/**
 * apparmor_bprm_committed_cred - do cleanup after new creds committed
 * @bprm: binprm for the exec  (NOT NULL)
 */
static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
{
	/* clear out temporary/transitional state from the context */
	aa_clear_task_ctx_trans(task_ctx(current));

	return;
}

static void apparmor_task_getsecid(struct task_struct *p, u32 *secid)
{
	struct aa_label *label = aa_get_task_label(p);
	*secid = label->secid;
	aa_put_label(label);
}

static int apparmor_task_setrlimit(struct task_struct *task,
		unsigned int resource, struct rlimit *new_rlim)
{
	struct aa_label *label = __begin_current_label_crit_section();
	int error = 0;

	if (!unconfined(label))
		error = aa_task_setrlimit(label, task, resource, new_rlim);
	__end_current_label_crit_section(label);

	return error;
}

static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
			      int sig, const struct cred *cred)
{
	struct aa_label *cl, *tl;
	int error;

	if (cred) {
		/*
		 * Dealing with USB IO specific behavior
		 */
		cl = aa_get_newest_cred_label(cred);
		tl = aa_get_task_label(target);
		error = aa_may_signal(cl, tl, sig);
		aa_put_label(cl);
		aa_put_label(tl);
		return error;
	}

	cl = __begin_current_label_crit_section();
	tl = aa_get_task_label(target);
	error = aa_may_signal(cl, tl, sig);
	aa_put_label(tl);
	__end_current_label_crit_section(cl);

	return error;
}

/**
 * apparmor_sk_alloc_security - allocate and attach the sk_security field
 */
static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
{
	struct aa_sk_ctx *ctx;

	ctx = kzalloc(sizeof(*ctx), flags);
	if (!ctx)
		return -ENOMEM;

	SK_CTX(sk) = ctx;

	return 0;
}

/**
 * apparmor_sk_free_security - free the sk_security field
 */
static void apparmor_sk_free_security(struct sock *sk)
{
	struct aa_sk_ctx *ctx = SK_CTX(sk);

	SK_CTX(sk) = NULL;
	aa_put_label(ctx->label);
	aa_put_label(ctx->peer);
	kfree(ctx);
}

/**
 * apparmor_clone_security - clone the sk_security field
 */
static void apparmor_sk_clone_security(const struct sock *sk,
				       struct sock *newsk)
{
	struct aa_sk_ctx *ctx = SK_CTX(sk);
	struct aa_sk_ctx *new = SK_CTX(newsk);

	new->label = aa_get_label(ctx->label);
	new->peer = aa_get_label(ctx->peer);
}

/**
 * apparmor_socket_create - check perms before creating a new socket
 */
static int apparmor_socket_create(int family, int type, int protocol, int kern)
{
	struct aa_label *label;
	int error = 0;

	AA_BUG(in_interrupt());

	label = begin_current_label_crit_section();
	if (!(kern || unconfined(label)))
		error = af_select(family,
				  create_perm(label, family, type, protocol),
				  aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
					     family, type, protocol));
	end_current_label_crit_section(label);

	return error;
}

/**
 * apparmor_socket_post_create - setup the per-socket security struct
 *
 * Note:
 * -   kernel sockets currently labeled unconfined but we may want to
 *     move to a special kernel label
 * -   socket may not have sk here if created with sock_create_lite or
 *     sock_alloc. These should be accept cases which will be handled in
 *     sock_graft.
 */
static int apparmor_socket_post_create(struct socket *sock, int family,
				       int type, int protocol, int kern)
{
	struct aa_label *label;

	if (kern) {
		struct aa_ns *ns = aa_get_current_ns();

		label = aa_get_label(ns_unconfined(ns));
		aa_put_ns(ns);
	} else
		label = aa_get_current_label();

	if (sock->sk) {
		struct aa_sk_ctx *ctx = SK_CTX(sock->sk);

		aa_put_label(ctx->label);
		ctx->label = aa_get_label(label);
	}
	aa_put_label(label);

	return 0;
}

/**
 * apparmor_socket_bind - check perms before bind addr to socket
 */
static int apparmor_socket_bind(struct socket *sock,
				struct sockaddr *address, int addrlen)
{
	AA_BUG(!sock);
	AA_BUG(!sock->sk);
	AA_BUG(!address);
	AA_BUG(in_interrupt());

	return af_select(sock->sk->sk_family,
			 bind_perm(sock, address, addrlen),
			 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
}

/**
 * apparmor_socket_connect - check perms before connecting @sock to @address
 */
static int apparmor_socket_connect(struct socket *sock,
				   struct sockaddr *address, int addrlen)
{
	AA_BUG(!sock);
	AA_BUG(!sock->sk);
	AA_BUG(!address);
	AA_BUG(in_interrupt());

	return af_select(sock->sk->sk_family,
			 connect_perm(sock, address, addrlen),
			 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
}

/**
 * apparmor_socket_list - check perms before allowing listen
 */
static int apparmor_socket_listen(struct socket *sock, int backlog)
{
	AA_BUG(!sock);
	AA_BUG(!sock->sk);
	AA_BUG(in_interrupt());

	return af_select(sock->sk->sk_family,
			 listen_perm(sock, backlog),
			 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
}

/**
 * apparmor_socket_accept - check perms before accepting a new connection.
 *
 * Note: while @newsock is created and has some information, the accept
 *       has not been done.
 */
static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
{
	AA_BUG(!sock);
	AA_BUG(!sock->sk);
	AA_BUG(!newsock);
	AA_BUG(in_interrupt());

	return af_select(sock->sk->sk_family,
			 accept_perm(sock, newsock),
			 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
}

static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
			    struct msghdr *msg, int size)
{
	AA_BUG(!sock);
	AA_BUG(!sock->sk);
	AA_BUG(!msg);
	AA_BUG(in_interrupt());

	return af_select(sock->sk->sk_family,
			 msg_perm(op, request, sock, msg, size),
			 aa_sk_perm(op, request, sock->sk));
}

/**
 * apparmor_socket_sendmsg - check perms before sending msg to another socket
 */
static int apparmor_socket_sendmsg(struct socket *sock,
				   struct msghdr *msg, int size)
{
	return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
}

/**
 * apparmor_socket_recvmsg - check perms before receiving a message
 */
static int apparmor_socket_recvmsg(struct socket *sock,
				   struct msghdr *msg, int size, int flags)
{
	return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
}

/* revaliation, get/set attr, shutdown */
static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
{
	AA_BUG(!sock);
	AA_BUG(!sock->sk);
	AA_BUG(in_interrupt());

	return af_select(sock->sk->sk_family,
			 sock_perm(op, request, sock),
			 aa_sk_perm(op, request, sock->sk));
}

/**
 * apparmor_socket_getsockname - check perms before getting the local address
 */
static int apparmor_socket_getsockname(struct socket *sock)
{
	return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
}

/**
 * apparmor_socket_getpeername - check perms before getting remote address
 */
static int apparmor_socket_getpeername(struct socket *sock)
{
	return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
}

/* revaliation, get/set attr, opt */
static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
			    int level, int optname)
{
	AA_BUG(!sock);
	AA_BUG(!sock->sk);
	AA_BUG(in_interrupt());

	return af_select(sock->sk->sk_family,
			 opt_perm(op, request, sock, level, optname),
			 aa_sk_perm(op, request, sock->sk));
}

/**
 * apparmor_getsockopt - check perms before getting socket options
 */
static int apparmor_socket_getsockopt(struct socket *sock, int level,
				      int optname)
{
	return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
				level, optname);
}

/**
 * apparmor_setsockopt - check perms before setting socket options
 */
static int apparmor_socket_setsockopt(struct socket *sock, int level,
				      int optname)
{
	return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
				level, optname);
}

/**
 * apparmor_socket_shutdown - check perms before shutting down @sock conn
 */
static int apparmor_socket_shutdown(struct socket *sock, int how)
{
	return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
}

#ifdef CONFIG_NETWORK_SECMARK
/**
 * apparmor_socket_sock_recv_skb - check perms before associating skb to sk
 *
 * Note: can not sleep may be called with locks held
 *
 * dont want protocol specific in __skb_recv_datagram()
 * to deny an incoming connection  socket_sock_rcv_skb()
 */
static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	struct aa_sk_ctx *ctx = SK_CTX(sk);

	if (!skb->secmark)
		return 0;

	return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
				      skb->secmark, sk);
}
#endif


static struct aa_label *sk_peer_label(struct sock *sk)
{
	struct aa_sk_ctx *ctx = SK_CTX(sk);

	if (ctx->peer)
		return ctx->peer;

	return ERR_PTR(-ENOPROTOOPT);
}

/**
 * apparmor_socket_getpeersec_stream - get security context of peer
 *
 * Note: for tcp only valid if using ipsec or cipso on lan
 */
static int apparmor_socket_getpeersec_stream(struct socket *sock,
					     char __user *optval,
					     int __user *optlen,
					     unsigned int len)
{
	char *name;
	int slen, error = 0;
	struct aa_label *label;
	struct aa_label *peer;

	label = begin_current_label_crit_section();
	peer = sk_peer_label(sock->sk);
	if (IS_ERR(peer)) {
		error = PTR_ERR(peer);
		goto done;
	}
	slen = aa_label_asxprint(&name, labels_ns(label), peer,
				 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
				 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
	/* don't include terminating \0 in slen, it breaks some apps */
	if (slen < 0) {
		error = -ENOMEM;
	} else {
		if (slen > len) {
			error = -ERANGE;
		} else if (copy_to_user(optval, name, slen)) {
			error = -EFAULT;
			goto out;
		}
		if (put_user(slen, optlen))
			error = -EFAULT;
out:
		kfree(name);

	}

done:
	end_current_label_crit_section(label);

	return error;
}

/**
 * apparmor_socket_getpeersec_dgram - get security label of packet
 * @sock: the peer socket
 * @skb: packet data
 * @secid: pointer to where to put the secid of the packet
 *
 * Sets the netlabel socket state on sk from parent
 */
static int apparmor_socket_getpeersec_dgram(struct socket *sock,
					    struct sk_buff *skb, u32 *secid)

{
	/* TODO: requires secid support */
	return -ENOPROTOOPT;
}

/**
 * apparmor_sock_graft - Initialize newly created socket
 * @sk: child sock
 * @parent: parent socket
 *
 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
 *       just set sk security information off of current creating process label
 *       Labeling of sk for accept case - probably should be sock based
 *       instead of task, because of the case where an implicitly labeled
 *       socket is shared by different tasks.
 */
static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
{
	struct aa_sk_ctx *ctx = SK_CTX(sk);

	if (!ctx->label)
		ctx->label = aa_get_current_label();
}

#ifdef CONFIG_NETWORK_SECMARK
static int apparmor_inet_conn_request(struct sock *sk, struct sk_buff *skb,
				      struct request_sock *req)
{
	struct aa_sk_ctx *ctx = SK_CTX(sk);

	if (!skb->secmark)
		return 0;

	return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
				      skb->secmark, sk);
}
#endif

static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
	LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
	LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
	LSM_HOOK_INIT(capget, apparmor_capget),
	LSM_HOOK_INIT(capable, apparmor_capable),

	LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
	LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
	LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),

	LSM_HOOK_INIT(path_link, apparmor_path_link),
	LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
	LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
	LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
	LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
	LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
	LSM_HOOK_INIT(path_rename, apparmor_path_rename),
	LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
	LSM_HOOK_INIT(path_chown, apparmor_path_chown),
	LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
	LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),

	LSM_HOOK_INIT(file_open, apparmor_file_open),
	LSM_HOOK_INIT(file_receive, apparmor_file_receive),
	LSM_HOOK_INIT(file_permission, apparmor_file_permission),
	LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
	LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
	LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
	LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
	LSM_HOOK_INIT(file_lock, apparmor_file_lock),

	LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
	LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),

	LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
	LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
	LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),

	LSM_HOOK_INIT(socket_create, apparmor_socket_create),
	LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
	LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
	LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
	LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
	LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
	LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
	LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
	LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
	LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
	LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
	LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
	LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
#ifdef CONFIG_NETWORK_SECMARK
	LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
#endif
	LSM_HOOK_INIT(socket_getpeersec_stream,
		      apparmor_socket_getpeersec_stream),
	LSM_HOOK_INIT(socket_getpeersec_dgram,
		      apparmor_socket_getpeersec_dgram),
	LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
#ifdef CONFIG_NETWORK_SECMARK
	LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
#endif

	LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
	LSM_HOOK_INIT(cred_free, apparmor_cred_free),
	LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
	LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),

	LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds),
	LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
	LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),

	LSM_HOOK_INIT(task_free, apparmor_task_free),
	LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
	LSM_HOOK_INIT(task_getsecid, apparmor_task_getsecid),
	LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
	LSM_HOOK_INIT(task_kill, apparmor_task_kill),

#ifdef CONFIG_AUDIT
	LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
	LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
	LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
	LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
#endif

	LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
	LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
	LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
};

/*
 * AppArmor sysfs module parameters
 */

static int param_set_aabool(const char *val, const struct kernel_param *kp);
static int param_get_aabool(char *buffer, const struct kernel_param *kp);
#define param_check_aabool param_check_bool
static const struct kernel_param_ops param_ops_aabool = {
	.flags = KERNEL_PARAM_OPS_FL_NOARG,
	.set = param_set_aabool,
	.get = param_get_aabool
};

static int param_set_aauint(const char *val, const struct kernel_param *kp);
static int param_get_aauint(char *buffer, const struct kernel_param *kp);
#define param_check_aauint param_check_uint
static const struct kernel_param_ops param_ops_aauint = {
	.set = param_set_aauint,
	.get = param_get_aauint
};

static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
#define param_check_aalockpolicy param_check_bool
static const struct kernel_param_ops param_ops_aalockpolicy = {
	.flags = KERNEL_PARAM_OPS_FL_NOARG,
	.set = param_set_aalockpolicy,
	.get = param_get_aalockpolicy
};

static int param_set_audit(const char *val, const struct kernel_param *kp);
static int param_get_audit(char *buffer, const struct kernel_param *kp);

static int param_set_mode(const char *val, const struct kernel_param *kp);
static int param_get_mode(char *buffer, const struct kernel_param *kp);

/* Flag values, also controllable via /sys/module/apparmor/parameters
 * We define special types as we want to do additional mediation.
 */

/* AppArmor global enforcement switch - complain, enforce, kill */
enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
module_param_call(mode, param_set_mode, param_get_mode,
		  &aa_g_profile_mode, S_IRUSR | S_IWUSR);

/* whether policy verification hashing is enabled */
bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
#ifdef CONFIG_SECURITY_APPARMOR_HASH
module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
#endif

/* Debug mode */
bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);

/* Audit mode */
enum audit_mode aa_g_audit;
module_param_call(audit, param_set_audit, param_get_audit,
		  &aa_g_audit, S_IRUSR | S_IWUSR);

/* Determines if audit header is included in audited messages.  This
 * provides more context if the audit daemon is not running
 */
bool aa_g_audit_header = true;
module_param_named(audit_header, aa_g_audit_header, aabool,
		   S_IRUSR | S_IWUSR);

/* lock out loading/removal of policy
 * TODO: add in at boot loading of policy, which is the only way to
 *       load policy, if lock_policy is set
 */
bool aa_g_lock_policy;
module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
		   S_IRUSR | S_IWUSR);

/* Syscall logging mode */
bool aa_g_logsyscall;
module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);

/* Maximum pathname length before accesses will start getting rejected */
unsigned int aa_g_path_max = 2 * PATH_MAX;
module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);

/* Determines how paranoid loading of policy is and how much verification
 * on the loaded policy is done.
 * DEPRECATED: read only as strict checking of load is always done now
 * that none root users (user namespaces) can load policy.
 */
bool aa_g_paranoid_load = true;
module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);

/* Boot time disable flag */
static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);

static int __init apparmor_enabled_setup(char *str)
{
	unsigned long enabled;
	int error = kstrtoul(str, 0, &enabled);
	if (!error)
		apparmor_enabled = enabled ? 1 : 0;
	return 1;
}

__setup("apparmor=", apparmor_enabled_setup);

/* set global flag turning off the ability to load policy */
static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
{
	if (!apparmor_enabled)
		return -EINVAL;
	if (apparmor_initialized && !policy_admin_capable(NULL))
		return -EPERM;
	return param_set_bool(val, kp);
}

static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
{
	if (!apparmor_enabled)
		return -EINVAL;
	if (apparmor_initialized && !policy_view_capable(NULL))
		return -EPERM;
	return param_get_bool(buffer, kp);
}

static int param_set_aabool(const char *val, const struct kernel_param *kp)
{
	if (!apparmor_enabled)
		return -EINVAL;
	if (apparmor_initialized && !policy_admin_capable(NULL))
		return -EPERM;
	return param_set_bool(val, kp);
}

static int param_get_aabool(char *buffer, const struct kernel_param *kp)
{
	if (!apparmor_enabled)
		return -EINVAL;
	if (apparmor_initialized && !policy_view_capable(NULL))
		return -EPERM;
	return param_get_bool(buffer, kp);
}

static int param_set_aauint(const char *val, const struct kernel_param *kp)
{
	int error;

	if (!apparmor_enabled)
		return -EINVAL;
	/* file is ro but enforce 2nd line check */
	if (apparmor_initialized)
		return -EPERM;

	error = param_set_uint(val, kp);
	pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);

	return error;
}

static int param_get_aauint(char *buffer, const struct kernel_param *kp)
{
	if (!apparmor_enabled)
		return -EINVAL;
	if (apparmor_initialized && !policy_view_capable(NULL))
		return -EPERM;
	return param_get_uint(buffer, kp);
}

static int param_get_audit(char *buffer, const struct kernel_param *kp)
{
	if (!apparmor_enabled)
		return -EINVAL;
	if (apparmor_initialized && !policy_view_capable(NULL))
		return -EPERM;
	return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
}

static int param_set_audit(const char *val, const struct kernel_param *kp)
{
	int i;

	if (!apparmor_enabled)
		return -EINVAL;
	if (!val)
		return -EINVAL;
	if (apparmor_initialized && !policy_admin_capable(NULL))
		return -EPERM;

	i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
	if (i < 0)
		return -EINVAL;

	aa_g_audit = i;
	return 0;
}

static int param_get_mode(char *buffer, const struct kernel_param *kp)
{
	if (!apparmor_enabled)
		return -EINVAL;
	if (apparmor_initialized && !policy_view_capable(NULL))
		return -EPERM;

	return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
}

static int param_set_mode(const char *val, const struct kernel_param *kp)
{
	int i;

	if (!apparmor_enabled)
		return -EINVAL;
	if (!val)
		return -EINVAL;
	if (apparmor_initialized && !policy_admin_capable(NULL))
		return -EPERM;

	i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
			 val);
	if (i < 0)
		return -EINVAL;

	aa_g_profile_mode = i;
	return 0;
}

/*
 * AppArmor init functions
 */

/**
 * set_init_ctx - set a task context and profile on the first task.
 *
 * TODO: allow setting an alternate profile than unconfined
 */
static int __init set_init_ctx(void)
{
	struct cred *cred = (struct cred *)current->real_cred;
	struct aa_task_ctx *ctx;

	ctx = aa_alloc_task_ctx(GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	cred_label(cred) = aa_get_label(ns_unconfined(root_ns));
	task_ctx(current) = ctx;

	return 0;
}

static void destroy_buffers(void)
{
	u32 i, j;

	for_each_possible_cpu(i) {
		for_each_cpu_buffer(j) {
			kfree(per_cpu(aa_buffers, i).buf[j]);
			per_cpu(aa_buffers, i).buf[j] = NULL;
		}
	}
}

static int __init alloc_buffers(void)
{
	u32 i, j;

	for_each_possible_cpu(i) {
		for_each_cpu_buffer(j) {
			char *buffer;

			if (cpu_to_node(i) > num_online_nodes())
				/* fallback to kmalloc for offline nodes */
				buffer = kmalloc(aa_g_path_max, GFP_KERNEL);
			else
				buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL,
						      cpu_to_node(i));
			if (!buffer) {
				destroy_buffers();
				return -ENOMEM;
			}
			per_cpu(aa_buffers, i).buf[j] = buffer;
		}
	}

	return 0;
}

#ifdef CONFIG_SYSCTL
static int apparmor_dointvec(struct ctl_table *table, int write,
			     void __user *buffer, size_t *lenp, loff_t *ppos)
{
	if (!policy_admin_capable(NULL))
		return -EPERM;
	if (!apparmor_enabled)
		return -EINVAL;

	return proc_dointvec(table, write, buffer, lenp, ppos);
}

static struct ctl_path apparmor_sysctl_path[] = {
	{ .procname = "kernel", },
	{ }
};

static struct ctl_table apparmor_sysctl_table[] = {
	{
		.procname       = "unprivileged_userns_apparmor_policy",
		.data           = &unprivileged_userns_apparmor_policy,
		.maxlen         = sizeof(int),
		.mode           = 0600,
		.proc_handler   = apparmor_dointvec,
	},
	{ }
};

static int __init apparmor_init_sysctl(void)
{
	return register_sysctl_paths(apparmor_sysctl_path,
				     apparmor_sysctl_table) ? 0 : -ENOMEM;
}
#else
static inline int apparmor_init_sysctl(void)
{
	return 0;
}
#endif /* CONFIG_SYSCTL */

#if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
static unsigned int apparmor_ip_postroute(void *priv,
					  struct sk_buff *skb,
					  const struct nf_hook_state *state)
{
	struct aa_sk_ctx *ctx;
	struct sock *sk;

	if (!skb->secmark)
		return NF_ACCEPT;

	sk = skb_to_full_sk(skb);
	if (sk == NULL)
		return NF_ACCEPT;

	ctx = SK_CTX(sk);
	if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
				    skb->secmark, sk))
		return NF_ACCEPT;

	return NF_DROP_ERR(-ECONNREFUSED);

}

static unsigned int apparmor_ipv4_postroute(void *priv,
					    struct sk_buff *skb,
					    const struct nf_hook_state *state)
{
	return apparmor_ip_postroute(priv, skb, state);
}

static unsigned int apparmor_ipv6_postroute(void *priv,
					    struct sk_buff *skb,
					    const struct nf_hook_state *state)
{
	return apparmor_ip_postroute(priv, skb, state);
}

static const struct nf_hook_ops apparmor_nf_ops[] = {
	{
		.hook =         apparmor_ipv4_postroute,
		.pf =           NFPROTO_IPV4,
		.hooknum =      NF_INET_POST_ROUTING,
		.priority =     NF_IP_PRI_SELINUX_FIRST,
	},
#if IS_ENABLED(CONFIG_IPV6)
	{
		.hook =         apparmor_ipv6_postroute,
		.pf =           NFPROTO_IPV6,
		.hooknum =      NF_INET_POST_ROUTING,
		.priority =     NF_IP6_PRI_SELINUX_FIRST,
	},
#endif
};

static int __net_init apparmor_nf_register(struct net *net)
{
	int ret;

	ret = nf_register_net_hooks(net, apparmor_nf_ops,
				    ARRAY_SIZE(apparmor_nf_ops));
	return ret;
}

static void __net_exit apparmor_nf_unregister(struct net *net)
{
	nf_unregister_net_hooks(net, apparmor_nf_ops,
				ARRAY_SIZE(apparmor_nf_ops));
}

static struct pernet_operations apparmor_net_ops = {
	.init = apparmor_nf_register,
	.exit = apparmor_nf_unregister,
};

static int __init apparmor_nf_ip_init(void)
{
	int err;

	if (!apparmor_enabled)
		return 0;

	err = register_pernet_subsys(&apparmor_net_ops);
	if (err)
		panic("Apparmor: register_pernet_subsys: error %d\n", err);

	return 0;
}
__initcall(apparmor_nf_ip_init);
#endif

static int __init apparmor_init(void)
{
	int error;

	if (!apparmor_enabled || !security_module_enable("apparmor")) {
		aa_info_message("AppArmor disabled by boot time parameter");
		apparmor_enabled = false;
		return 0;
	}

	aa_secids_init();

	error = aa_setup_dfa_engine();
	if (error) {
		AA_ERROR("Unable to setup dfa engine\n");
		goto alloc_out;
	}

	error = aa_alloc_root_ns();
	if (error) {
		AA_ERROR("Unable to allocate default profile namespace\n");
		goto alloc_out;
	}

	error = apparmor_init_sysctl();
	if (error) {
		AA_ERROR("Unable to register sysctls\n");
		goto alloc_out;

	}

	error = alloc_buffers();
	if (error) {
		AA_ERROR("Unable to allocate work buffers\n");
		goto buffers_out;
	}

	error = set_init_ctx();
	if (error) {
		AA_ERROR("Failed to set context on init task\n");
		aa_free_root_ns();
		goto buffers_out;
	}
	security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
				"apparmor");

	/* Report that AppArmor successfully initialized */
	apparmor_initialized = 1;
	if (aa_g_profile_mode == APPARMOR_COMPLAIN)
		aa_info_message("AppArmor initialized: complain mode enabled");
	else if (aa_g_profile_mode == APPARMOR_KILL)
		aa_info_message("AppArmor initialized: kill mode enabled");
	else
		aa_info_message("AppArmor initialized");

	return error;

buffers_out:
	destroy_buffers();

alloc_out:
	aa_destroy_aafs();
	aa_teardown_dfa_engine();

	apparmor_enabled = false;
	return error;
}

DEFINE_LSM(apparmor) = {
	.name = "apparmor",
	.init = apparmor_init,
};