summaryrefslogtreecommitdiffstats
path: root/security/apparmor/apparmorfs.c
blob: 41073f70eb41db135b8b68defa7523c161624991 (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
/*
 * AppArmor security module
 *
 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
 *
 * 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/ctype.h>
#include <linux/security.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/capability.h>
#include <linux/rcupdate.h>
#include <uapi/linux/major.h>
#include <linux/fs.h>

#include "include/apparmor.h"
#include "include/apparmorfs.h"
#include "include/audit.h"
#include "include/context.h"
#include "include/crypto.h"
#include "include/policy.h"
#include "include/policy_ns.h"
#include "include/resource.h"
#include "include/policy_unpack.h"

/**
 * aa_mangle_name - mangle a profile name to std profile layout form
 * @name: profile name to mangle  (NOT NULL)
 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
 *
 * Returns: length of mangled name
 */
static int mangle_name(const char *name, char *target)
{
	char *t = target;

	while (*name == '/' || *name == '.')
		name++;

	if (target) {
		for (; *name; name++) {
			if (*name == '/')
				*(t)++ = '.';
			else if (isspace(*name))
				*(t)++ = '_';
			else if (isalnum(*name) || strchr("._-", *name))
				*(t)++ = *name;
		}

		*t = 0;
	} else {
		int len = 0;
		for (; *name; name++) {
			if (isalnum(*name) || isspace(*name) ||
			    strchr("/._-", *name))
				len++;
		}

		return len;
	}

	return t - target;
}

/**
 * aa_simple_write_to_buffer - common routine for getting policy from user
 * @userbuf: user buffer to copy data from  (NOT NULL)
 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
 * @copy_size: size of data to copy from user buffer
 * @pos: position write is at in the file (NOT NULL)
 *
 * Returns: kernel buffer containing copy of user buffer data or an
 *          ERR_PTR on failure.
 */
static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
						     size_t alloc_size,
						     size_t copy_size,
						     loff_t *pos)
{
	struct aa_loaddata *data;

	AA_BUG(copy_size > alloc_size);

	if (*pos != 0)
		/* only writes from pos 0, that is complete writes */
		return ERR_PTR(-ESPIPE);

	/* freed by caller to simple_write_to_buffer */
	data = kvmalloc(sizeof(*data) + alloc_size);
	if (data == NULL)
		return ERR_PTR(-ENOMEM);
	kref_init(&data->count);
	data->size = copy_size;
	data->hash = NULL;
	data->abi = 0;

	if (copy_from_user(data->data, userbuf, copy_size)) {
		kvfree(data);
		return ERR_PTR(-EFAULT);
	}

	return data;
}

static ssize_t policy_update(int binop, const char __user *buf, size_t size,
			     loff_t *pos, struct aa_ns *ns)
{
	ssize_t error;
	struct aa_loaddata *data;
	struct aa_profile *profile = aa_current_profile();
	const char *op = binop == PROF_ADD ? OP_PROF_LOAD : OP_PROF_REPL;
	/* high level check about policy management - fine grained in
	 * below after unpack
	 */
	error = aa_may_manage_policy(profile, ns, op);
	if (error)
		return error;

	data = aa_simple_write_to_buffer(buf, size, size, pos);
	error = PTR_ERR(data);
	if (!IS_ERR(data)) {
		error = aa_replace_profiles(ns ? ns : profile->ns, profile,
					    binop, data);
		aa_put_loaddata(data);
	}

	return error;
}

/* .load file hook fn to load policy */
static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
			    loff_t *pos)
{
	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
	int error = policy_update(PROF_ADD, buf, size, pos, ns);

	aa_put_ns(ns);

	return error;
}

static const struct file_operations aa_fs_profile_load = {
	.write = profile_load,
	.llseek = default_llseek,
};

/* .replace file hook fn to load and/or replace policy */
static ssize_t profile_replace(struct file *f, const char __user *buf,
			       size_t size, loff_t *pos)
{
	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
	int error = policy_update(PROF_REPLACE, buf, size, pos, ns);

	aa_put_ns(ns);

	return error;
}

static const struct file_operations aa_fs_profile_replace = {
	.write = profile_replace,
	.llseek = default_llseek,
};

/* .remove file hook fn to remove loaded policy */
static ssize_t profile_remove(struct file *f, const char __user *buf,
			      size_t size, loff_t *pos)
{
	struct aa_loaddata *data;
	struct aa_profile *profile;
	ssize_t error;
	struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);

	profile = aa_current_profile();
	/* high level check about policy management - fine grained in
	 * below after unpack
	 */
	error = aa_may_manage_policy(profile, ns, OP_PROF_RM);
	if (error)
		goto out;

	/*
	 * aa_remove_profile needs a null terminated string so 1 extra
	 * byte is allocated and the copied data is null terminated.
	 */
	data = aa_simple_write_to_buffer(buf, size + 1, size, pos);

	error = PTR_ERR(data);
	if (!IS_ERR(data)) {
		data->data[size] = 0;
		error = aa_remove_profiles(ns ? ns : profile->ns, profile,
					   data->data, size);
		aa_put_loaddata(data);
	}
 out:
	aa_put_ns(ns);
	return error;
}

static const struct file_operations aa_fs_profile_remove = {
	.write = profile_remove,
	.llseek = default_llseek,
};

/**
 * query_data - queries a policy and writes its data to buf
 * @buf: the resulting data is stored here (NOT NULL)
 * @buf_len: size of buf
 * @query: query string used to retrieve data
 * @query_len: size of query including second NUL byte
 *
 * The buffers pointed to by buf and query may overlap. The query buffer is
 * parsed before buf is written to.
 *
 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
 * the security confinement context and <KEY> is the name of the data to
 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
 *
 * Don't expect the contents of buf to be preserved on failure.
 *
 * Returns: number of characters written to buf or -errno on failure
 */
static ssize_t query_data(char *buf, size_t buf_len,
			  char *query, size_t query_len)
{
	char *out;
	const char *key;
	struct aa_profile *profile;
	struct aa_data *data;
	u32 bytes, blocks;
	__le32 outle32;

	if (!query_len)
		return -EINVAL; /* need a query */

	key = query + strnlen(query, query_len) + 1;
	if (key + 1 >= query + query_len)
		return -EINVAL; /* not enough space for a non-empty key */
	if (key + strnlen(key, query + query_len - key) >= query + query_len)
		return -EINVAL; /* must end with NUL */

	if (buf_len < sizeof(bytes) + sizeof(blocks))
		return -EINVAL; /* not enough space */

	profile = aa_current_profile();

	/* We are going to leave space for two numbers. The first is the total
	 * number of bytes we are writing after the first number. This is so
	 * users can read the full output without reallocation.
	 *
	 * The second number is the number of data blocks we're writing. An
	 * application might be confined by multiple policies having data in
	 * the same key.
	 */
	memset(buf, 0, sizeof(bytes) + sizeof(blocks));
	out = buf + sizeof(bytes) + sizeof(blocks);

	blocks = 0;
	if (profile->data) {
		data = rhashtable_lookup_fast(profile->data, &key,
					      profile->data->p);

		if (data) {
			if (out + sizeof(outle32) + data->size > buf + buf_len)
				return -EINVAL; /* not enough space */
			outle32 = __cpu_to_le32(data->size);
			memcpy(out, &outle32, sizeof(outle32));
			out += sizeof(outle32);
			memcpy(out, data->data, data->size);
			out += data->size;
			blocks++;
		}
	}

	outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
	memcpy(buf, &outle32, sizeof(outle32));
	outle32 = __cpu_to_le32(blocks);
	memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));

	return out - buf;
}

#define QUERY_CMD_DATA		"data\0"
#define QUERY_CMD_DATA_LEN	5

/**
 * aa_write_access - generic permissions and data query
 * @file: pointer to open apparmorfs/access file
 * @ubuf: user buffer containing the complete query string (NOT NULL)
 * @count: size of ubuf
 * @ppos: position in the file (MUST BE ZERO)
 *
 * Allows for one permissions or data query per open(), write(), and read()
 * sequence. The only queries currently supported are label-based queries for
 * permissions or data.
 *
 * For permissions queries, ubuf must begin with "label\0", followed by the
 * profile query specific format described in the query_label() function
 * documentation.
 *
 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
 * <LABEL> is the name of the security confinement context and <KEY> is the
 * name of the data to retrieve.
 *
 * Returns: number of bytes written or -errno on failure
 */
static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
			       size_t count, loff_t *ppos)
{
	char *buf;
	ssize_t len;

	if (*ppos)
		return -ESPIPE;

	buf = simple_transaction_get(file, ubuf, count);
	if (IS_ERR(buf))
		return PTR_ERR(buf);

	if (count > QUERY_CMD_DATA_LEN &&
		   !memcmp(buf, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
		len = query_data(buf, SIMPLE_TRANSACTION_LIMIT,
				 buf + QUERY_CMD_DATA_LEN,
				 count - QUERY_CMD_DATA_LEN);
	} else
		len = -EINVAL;

	if (len < 0)
		return len;

	simple_transaction_set(file, len);

	return count;
}

static const struct file_operations aa_fs_access = {
	.write		= aa_write_access,
	.read		= simple_transaction_read,
	.release	= simple_transaction_release,
	.llseek		= generic_file_llseek,
};

static int aa_fs_seq_show(struct seq_file *seq, void *v)
{
	struct aa_fs_entry *fs_file = seq->private;

	if (!fs_file)
		return 0;

	switch (fs_file->v_type) {
	case AA_FS_TYPE_BOOLEAN:
		seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
		break;
	case AA_FS_TYPE_STRING:
		seq_printf(seq, "%s\n", fs_file->v.string);
		break;
	case AA_FS_TYPE_U64:
		seq_printf(seq, "%#08lx\n", fs_file->v.u64);
		break;
	default:
		/* Ignore unpritable entry types. */
		break;
	}

	return 0;
}

static int aa_fs_seq_open(struct inode *inode, struct file *file)
{
	return single_open(file, aa_fs_seq_show, inode->i_private);
}

const struct file_operations aa_fs_seq_file_ops = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
				  int (*show)(struct seq_file *, void *))
{
	struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
	int error = single_open(file, show, proxy);

	if (error) {
		file->private_data = NULL;
		aa_put_proxy(proxy);
	}

	return error;
}

static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = (struct seq_file *) file->private_data;
	if (seq)
		aa_put_proxy(seq->private);
	return single_release(inode, file);
}

static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
{
	struct aa_proxy *proxy = seq->private;
	struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
	seq_printf(seq, "%s\n", profile->base.name);
	aa_put_profile(profile);

	return 0;
}

static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
{
	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
}

static const struct file_operations aa_fs_profname_fops = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_profname_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= aa_fs_seq_profile_release,
};

static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
{
	struct aa_proxy *proxy = seq->private;
	struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
	seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
	aa_put_profile(profile);

	return 0;
}

static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
{
	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
}

static const struct file_operations aa_fs_profmode_fops = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_profmode_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= aa_fs_seq_profile_release,
};

static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
{
	struct aa_proxy *proxy = seq->private;
	struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
	if (profile->attach)
		seq_printf(seq, "%s\n", profile->attach);
	else if (profile->xmatch)
		seq_puts(seq, "<unknown>\n");
	else
		seq_printf(seq, "%s\n", profile->base.name);
	aa_put_profile(profile);

	return 0;
}

static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
{
	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
}

static const struct file_operations aa_fs_profattach_fops = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_profattach_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= aa_fs_seq_profile_release,
};

static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
{
	struct aa_proxy *proxy = seq->private;
	struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
	unsigned int i, size = aa_hash_size();

	if (profile->hash) {
		for (i = 0; i < size; i++)
			seq_printf(seq, "%.2x", profile->hash[i]);
		seq_puts(seq, "\n");
	}
	aa_put_profile(profile);

	return 0;
}

static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
{
	return single_open(file, aa_fs_seq_hash_show, inode->i_private);
}

static const struct file_operations aa_fs_seq_hash_fops = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_hash_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};


static int aa_fs_seq_show_ns_level(struct seq_file *seq, void *v)
{
	struct aa_ns *ns = aa_current_profile()->ns;

	seq_printf(seq, "%d\n", ns->level);

	return 0;
}

static int aa_fs_seq_open_ns_level(struct inode *inode, struct file *file)
{
	return single_open(file, aa_fs_seq_show_ns_level, inode->i_private);
}

static const struct file_operations aa_fs_ns_level = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_open_ns_level,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int aa_fs_seq_show_ns_name(struct seq_file *seq, void *v)
{
	struct aa_ns *ns = aa_current_profile()->ns;

	seq_printf(seq, "%s\n", ns->base.name);

	return 0;
}

static int aa_fs_seq_open_ns_name(struct inode *inode, struct file *file)
{
	return single_open(file, aa_fs_seq_show_ns_name, inode->i_private);
}

static const struct file_operations aa_fs_ns_name = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_open_ns_name,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int rawdata_release(struct inode *inode, struct file *file)
{
	/* TODO: switch to loaddata when profile switched to symlink */
	aa_put_loaddata(file->private_data);

	return 0;
}

static int aa_fs_seq_raw_abi_show(struct seq_file *seq, void *v)
{
	struct aa_proxy *proxy = seq->private;
	struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);

	if (profile->rawdata->abi) {
		seq_printf(seq, "v%d", profile->rawdata->abi);
		seq_puts(seq, "\n");
	}
	aa_put_profile(profile);

	return 0;
}

static int aa_fs_seq_raw_abi_open(struct inode *inode, struct file *file)
{
	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_abi_show);
}

static const struct file_operations aa_fs_seq_raw_abi_fops = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_raw_abi_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= aa_fs_seq_profile_release,
};

static int aa_fs_seq_raw_hash_show(struct seq_file *seq, void *v)
{
	struct aa_proxy *proxy = seq->private;
	struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
	unsigned int i, size = aa_hash_size();

	if (profile->rawdata->hash) {
		for (i = 0; i < size; i++)
			seq_printf(seq, "%.2x", profile->rawdata->hash[i]);
		seq_puts(seq, "\n");
	}
	aa_put_profile(profile);

	return 0;
}

static int aa_fs_seq_raw_hash_open(struct inode *inode, struct file *file)
{
	return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_hash_show);
}

static const struct file_operations aa_fs_seq_raw_hash_fops = {
	.owner		= THIS_MODULE,
	.open		= aa_fs_seq_raw_hash_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= aa_fs_seq_profile_release,
};

static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
			    loff_t *ppos)
{
	struct aa_loaddata *rawdata = file->private_data;

	return simple_read_from_buffer(buf, size, ppos, rawdata->data,
				       rawdata->size);
}

static int rawdata_open(struct inode *inode, struct file *file)
{
	struct aa_proxy *proxy = inode->i_private;
	struct aa_profile *profile;

	if (!policy_view_capable(NULL))
		return -EACCES;
	profile = aa_get_profile_rcu(&proxy->profile);
	file->private_data = aa_get_loaddata(profile->rawdata);
	aa_put_profile(profile);

	return 0;
}

static const struct file_operations aa_fs_rawdata_fops = {
	.open = rawdata_open,
	.read = rawdata_read,
	.llseek = generic_file_llseek,
	.release = rawdata_release,
};

/** fns to setup dynamic per profile/namespace files **/
void __aa_fs_profile_rmdir(struct aa_profile *profile)
{
	struct aa_profile *child;
	int i;

	if (!profile)
		return;

	list_for_each_entry(child, &profile->base.profiles, base.list)
		__aa_fs_profile_rmdir(child);

	for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
		struct aa_proxy *proxy;
		if (!profile->dents[i])
			continue;

		proxy = d_inode(profile->dents[i])->i_private;
		securityfs_remove(profile->dents[i]);
		aa_put_proxy(proxy);
		profile->dents[i] = NULL;
	}
}

void __aa_fs_profile_migrate_dents(struct aa_profile *old,
				   struct aa_profile *new)
{
	int i;

	for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
		new->dents[i] = old->dents[i];
		if (new->dents[i])
			new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
		old->dents[i] = NULL;
	}
}

static struct dentry *create_profile_file(struct dentry *dir, const char *name,
					  struct aa_profile *profile,
					  const struct file_operations *fops)
{
	struct aa_proxy *proxy = aa_get_proxy(profile->proxy);
	struct dentry *dent;

	dent = securityfs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
	if (IS_ERR(dent))
		aa_put_proxy(proxy);

	return dent;
}

/* requires lock be held */
int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
{
	struct aa_profile *child;
	struct dentry *dent = NULL, *dir;
	int error;

	if (!parent) {
		struct aa_profile *p;
		p = aa_deref_parent(profile);
		dent = prof_dir(p);
		/* adding to parent that previously didn't have children */
		dent = securityfs_create_dir("profiles", dent);
		if (IS_ERR(dent))
			goto fail;
		prof_child_dir(p) = parent = dent;
	}

	if (!profile->dirname) {
		int len, id_len;
		len = mangle_name(profile->base.name, NULL);
		id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);

		profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
		if (!profile->dirname)
			goto fail;

		mangle_name(profile->base.name, profile->dirname);
		sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
	}

	dent = securityfs_create_dir(profile->dirname, parent);
	if (IS_ERR(dent))
		goto fail;
	prof_dir(profile) = dir = dent;

	dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
	if (IS_ERR(dent))
		goto fail;
	profile->dents[AAFS_PROF_NAME] = dent;

	dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
	if (IS_ERR(dent))
		goto fail;
	profile->dents[AAFS_PROF_MODE] = dent;

	dent = create_profile_file(dir, "attach", profile,
				   &aa_fs_profattach_fops);
	if (IS_ERR(dent))
		goto fail;
	profile->dents[AAFS_PROF_ATTACH] = dent;

	if (profile->hash) {
		dent = create_profile_file(dir, "sha1", profile,
					   &aa_fs_seq_hash_fops);
		if (IS_ERR(dent))
			goto fail;
		profile->dents[AAFS_PROF_HASH] = dent;
	}

	if (profile->rawdata) {
		dent = create_profile_file(dir, "raw_sha1", profile,
					   &aa_fs_seq_raw_hash_fops);
		if (IS_ERR(dent))
			goto fail;
		profile->dents[AAFS_PROF_RAW_HASH] = dent;

		dent = create_profile_file(dir, "raw_abi", profile,
					   &aa_fs_seq_raw_abi_fops);
		if (IS_ERR(dent))
			goto fail;
		profile->dents[AAFS_PROF_RAW_ABI] = dent;

		dent = securityfs_create_file("raw_data", S_IFREG | 0444, dir,
					      profile->proxy,
					      &aa_fs_rawdata_fops);
		if (IS_ERR(dent))
			goto fail;
		profile->dents[AAFS_PROF_RAW_DATA] = dent;
		d_inode(dent)->i_size = profile->rawdata->size;
		aa_get_proxy(profile->proxy);
	}

	list_for_each_entry(child, &profile->base.profiles, base.list) {
		error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
		if (error)
			goto fail2;
	}

	return 0;

fail:
	error = PTR_ERR(dent);

fail2:
	__aa_fs_profile_rmdir(profile);

	return error;
}

void __aa_fs_ns_rmdir(struct aa_ns *ns)
{
	struct aa_ns *sub;
	struct aa_profile *child;
	int i;

	if (!ns)
		return;

	list_for_each_entry(child, &ns->base.profiles, base.list)
		__aa_fs_profile_rmdir(child);

	list_for_each_entry(sub, &ns->sub_ns, base.list) {
		mutex_lock(&sub->lock);
		__aa_fs_ns_rmdir(sub);
		mutex_unlock(&sub->lock);
	}

	if (ns_subns_dir(ns)) {
		sub = d_inode(ns_subns_dir(ns))->i_private;
		aa_put_ns(sub);
	}
	if (ns_subload(ns)) {
		sub = d_inode(ns_subload(ns))->i_private;
		aa_put_ns(sub);
	}
	if (ns_subreplace(ns)) {
		sub = d_inode(ns_subreplace(ns))->i_private;
		aa_put_ns(sub);
	}
	if (ns_subremove(ns)) {
		sub = d_inode(ns_subremove(ns))->i_private;
		aa_put_ns(sub);
	}

	for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
		securityfs_remove(ns->dents[i]);
		ns->dents[i] = NULL;
	}
}

/* assumes cleanup in caller */
static int __aa_fs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
{
	struct dentry *dent;

	AA_BUG(!ns);
	AA_BUG(!dir);

	dent = securityfs_create_dir("profiles", dir);
	if (IS_ERR(dent))
		return PTR_ERR(dent);
	ns_subprofs_dir(ns) = dent;

	dent = securityfs_create_dir("raw_data", dir);
	if (IS_ERR(dent))
		return PTR_ERR(dent);
	ns_subdata_dir(ns) = dent;

	dent = securityfs_create_file(".load", 0640, dir, ns,
				      &aa_fs_profile_load);
	if (IS_ERR(dent))
		return PTR_ERR(dent);
	aa_get_ns(ns);
	ns_subload(ns) = dent;

	dent = securityfs_create_file(".replace", 0640, dir, ns,
				      &aa_fs_profile_replace);
	if (IS_ERR(dent))
		return PTR_ERR(dent);
	aa_get_ns(ns);
	ns_subreplace(ns) = dent;

	dent = securityfs_create_file(".remove", 0640, dir, ns,
				      &aa_fs_profile_remove);
	if (IS_ERR(dent))
		return PTR_ERR(dent);
	aa_get_ns(ns);
	ns_subremove(ns) = dent;

	dent = securityfs_create_dir("namespaces", dir);
	if (IS_ERR(dent))
		return PTR_ERR(dent);
	aa_get_ns(ns);
	ns_subns_dir(ns) = dent;

	return 0;
}

int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
{
	struct aa_ns *sub;
	struct aa_profile *child;
	struct dentry *dent, *dir;
	int error;

	AA_BUG(!ns);
	AA_BUG(!parent);
	AA_BUG(!mutex_is_locked(&ns->lock));

	if (!name)
		name = ns->base.name;

	/* create ns dir if it doesn't already exist */
	dent = securityfs_create_dir(name, parent);
	if (IS_ERR(dent))
		goto fail;

	ns_dir(ns) = dir = dent;
	error = __aa_fs_ns_mkdir_entries(ns, dir);
	if (error)
		goto fail2;

	/* profiles */
	list_for_each_entry(child, &ns->base.profiles, base.list) {
		error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
		if (error)
			goto fail2;
	}

	/* subnamespaces */
	list_for_each_entry(sub, &ns->sub_ns, base.list) {
		mutex_lock(&sub->lock);
		error = __aa_fs_ns_mkdir(sub, ns_subns_dir(ns), NULL);
		mutex_unlock(&sub->lock);
		if (error)
			goto fail2;
	}

	return 0;

fail:
	error = PTR_ERR(dent);

fail2:
	__aa_fs_ns_rmdir(ns);

	return error;
}


#define list_entry_is_head(pos, head, member) (&pos->member == (head))

/**
 * __next_ns - find the next namespace to list
 * @root: root namespace to stop search at (NOT NULL)
 * @ns: current ns position (NOT NULL)
 *
 * Find the next namespace from @ns under @root and handle all locking needed
 * while switching current namespace.
 *
 * Returns: next namespace or NULL if at last namespace under @root
 * Requires: ns->parent->lock to be held
 * NOTE: will not unlock root->lock
 */
static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
{
	struct aa_ns *parent, *next;

	/* is next namespace a child */
	if (!list_empty(&ns->sub_ns)) {
		next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
		mutex_lock(&next->lock);
		return next;
	}

	/* check if the next ns is a sibling, parent, gp, .. */
	parent = ns->parent;
	while (ns != root) {
		mutex_unlock(&ns->lock);
		next = list_next_entry(ns, base.list);
		if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
			mutex_lock(&next->lock);
			return next;
		}
		ns = parent;
		parent = parent->parent;
	}

	return NULL;
}

/**
 * __first_profile - find the first profile in a namespace
 * @root: namespace that is root of profiles being displayed (NOT NULL)
 * @ns: namespace to start in   (NOT NULL)
 *
 * Returns: unrefcounted profile or NULL if no profile
 * Requires: profile->ns.lock to be held
 */
static struct aa_profile *__first_profile(struct aa_ns *root,
					  struct aa_ns *ns)
{
	for (; ns; ns = __next_ns(root, ns)) {
		if (!list_empty(&ns->base.profiles))
			return list_first_entry(&ns->base.profiles,
						struct aa_profile, base.list);
	}
	return NULL;
}

/**
 * __next_profile - step to the next profile in a profile tree
 * @profile: current profile in tree (NOT NULL)
 *
 * Perform a depth first traversal on the profile tree in a namespace
 *
 * Returns: next profile or NULL if done
 * Requires: profile->ns.lock to be held
 */
static struct aa_profile *__next_profile(struct aa_profile *p)
{
	struct aa_profile *parent;
	struct aa_ns *ns = p->ns;

	/* is next profile a child */
	if (!list_empty(&p->base.profiles))
		return list_first_entry(&p->base.profiles, typeof(*p),
					base.list);

	/* is next profile a sibling, parent sibling, gp, sibling, .. */
	parent = rcu_dereference_protected(p->parent,
					   mutex_is_locked(&p->ns->lock));
	while (parent) {
		p = list_next_entry(p, base.list);
		if (!list_entry_is_head(p, &parent->base.profiles, base.list))
			return p;
		p = parent;
		parent = rcu_dereference_protected(parent->parent,
					    mutex_is_locked(&parent->ns->lock));
	}

	/* is next another profile in the namespace */
	p = list_next_entry(p, base.list);
	if (!list_entry_is_head(p, &ns->base.profiles, base.list))
		return p;

	return NULL;
}

/**
 * next_profile - step to the next profile in where ever it may be
 * @root: root namespace  (NOT NULL)
 * @profile: current profile  (NOT NULL)
 *
 * Returns: next profile or NULL if there isn't one
 */
static struct aa_profile *next_profile(struct aa_ns *root,
				       struct aa_profile *profile)
{
	struct aa_profile *next = __next_profile(profile);
	if (next)
		return next;

	/* finished all profiles in namespace move to next namespace */
	return __first_profile(root, __next_ns(root, profile->ns));
}

/**
 * p_start - start a depth first traversal of profile tree
 * @f: seq_file to fill
 * @pos: current position
 *
 * Returns: first profile under current namespace or NULL if none found
 *
 * acquires first ns->lock
 */
static void *p_start(struct seq_file *f, loff_t *pos)
{
	struct aa_profile *profile = NULL;
	struct aa_ns *root = aa_current_profile()->ns;
	loff_t l = *pos;
	f->private = aa_get_ns(root);


	/* find the first profile */
	mutex_lock(&root->lock);
	profile = __first_profile(root, root);

	/* skip to position */
	for (; profile && l > 0; l--)
		profile = next_profile(root, profile);

	return profile;
}

/**
 * p_next - read the next profile entry
 * @f: seq_file to fill
 * @p: profile previously returned
 * @pos: current position
 *
 * Returns: next profile after @p or NULL if none
 *
 * may acquire/release locks in namespace tree as necessary
 */
static void *p_next(struct seq_file *f, void *p, loff_t *pos)
{
	struct aa_profile *profile = p;
	struct aa_ns *ns = f->private;
	(*pos)++;

	return next_profile(ns, profile);
}

/**
 * p_stop - stop depth first traversal
 * @f: seq_file we are filling
 * @p: the last profile writen
 *
 * Release all locking done by p_start/p_next on namespace tree
 */
static void p_stop(struct seq_file *f, void *p)
{
	struct aa_profile *profile = p;
	struct aa_ns *root = f->private, *ns;

	if (profile) {
		for (ns = profile->ns; ns && ns != root; ns = ns->parent)
			mutex_unlock(&ns->lock);
	}
	mutex_unlock(&root->lock);
	aa_put_ns(root);
}

/**
 * seq_show_profile - show a profile entry
 * @f: seq_file to file
 * @p: current position (profile)    (NOT NULL)
 *
 * Returns: error on failure
 */
static int seq_show_profile(struct seq_file *f, void *p)
{
	struct aa_profile *profile = (struct aa_profile *)p;
	struct aa_ns *root = f->private;

	if (profile->ns != root)
		seq_printf(f, ":%s://", aa_ns_name(root, profile->ns, true));
	seq_printf(f, "%s (%s)\n", profile->base.hname,
		   aa_profile_mode_names[profile->mode]);

	return 0;
}

static const struct seq_operations aa_fs_profiles_op = {
	.start = p_start,
	.next = p_next,
	.stop = p_stop,
	.show = seq_show_profile,
};

static int profiles_open(struct inode *inode, struct file *file)
{
	if (!policy_view_capable(NULL))
		return -EACCES;

	return seq_open(file, &aa_fs_profiles_op);
}

static int profiles_release(struct inode *inode, struct file *file)
{
	return seq_release(inode, file);
}

static const struct file_operations aa_fs_profiles_fops = {
	.open = profiles_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = profiles_release,
};


/** Base file system setup **/
static struct aa_fs_entry aa_fs_entry_file[] = {
	AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
				  "link lock"),
	{ }
};

static struct aa_fs_entry aa_fs_entry_domain[] = {
	AA_FS_FILE_BOOLEAN("change_hat",	1),
	AA_FS_FILE_BOOLEAN("change_hatv",	1),
	AA_FS_FILE_BOOLEAN("change_onexec",	1),
	AA_FS_FILE_BOOLEAN("change_profile",	1),
	AA_FS_FILE_BOOLEAN("fix_binfmt_elf_mmap",	1),
	AA_FS_FILE_STRING("version", "1.2"),
	{ }
};

static struct aa_fs_entry aa_fs_entry_versions[] = {
	AA_FS_FILE_BOOLEAN("v5",	1),
	{ }
};

static struct aa_fs_entry aa_fs_entry_policy[] = {
	AA_FS_DIR("versions",                   aa_fs_entry_versions),
	AA_FS_FILE_BOOLEAN("set_load",		1),
	{ }
};

static struct aa_fs_entry aa_fs_entry_features[] = {
	AA_FS_DIR("policy",			aa_fs_entry_policy),
	AA_FS_DIR("domain",			aa_fs_entry_domain),
	AA_FS_DIR("file",			aa_fs_entry_file),
	AA_FS_FILE_U64("capability",		VFS_CAP_FLAGS_MASK),
	AA_FS_DIR("rlimit",			aa_fs_entry_rlimit),
	AA_FS_DIR("caps",			aa_fs_entry_caps),
	{ }
};

static struct aa_fs_entry aa_fs_entry_apparmor[] = {
	AA_FS_FILE_FOPS(".access", 0640, &aa_fs_access),
	AA_FS_FILE_FOPS(".ns_level", 0666, &aa_fs_ns_level),
	AA_FS_FILE_FOPS(".ns_name", 0640, &aa_fs_ns_name),
	AA_FS_FILE_FOPS("profiles", 0440, &aa_fs_profiles_fops),
	AA_FS_DIR("features", aa_fs_entry_features),
	{ }
};

static struct aa_fs_entry aa_fs_entry =
	AA_FS_DIR("apparmor", aa_fs_entry_apparmor);

/**
 * aafs_create_file - create a file entry in the apparmor securityfs
 * @fs_file: aa_fs_entry to build an entry for (NOT NULL)
 * @parent: the parent dentry in the securityfs
 *
 * Use aafs_remove_file to remove entries created with this fn.
 */
static int __init aafs_create_file(struct aa_fs_entry *fs_file,
				   struct dentry *parent)
{
	int error = 0;

	fs_file->dentry = securityfs_create_file(fs_file->name,
						 S_IFREG | fs_file->mode,
						 parent, fs_file,
						 fs_file->file_ops);
	if (IS_ERR(fs_file->dentry)) {
		error = PTR_ERR(fs_file->dentry);
		fs_file->dentry = NULL;
	}
	return error;
}

static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
/**
 * aafs_create_dir - recursively create a directory entry in the securityfs
 * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
 * @parent: the parent dentry in the securityfs
 *
 * Use aafs_remove_dir to remove entries created with this fn.
 */
static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
				  struct dentry *parent)
{
	struct aa_fs_entry *fs_file;
	struct dentry *dir;
	int error;

	dir = securityfs_create_dir(fs_dir->name, parent);
	if (IS_ERR(dir))
		return PTR_ERR(dir);
	fs_dir->dentry = dir;

	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
		if (fs_file->v_type == AA_FS_TYPE_DIR)
			error = aafs_create_dir(fs_file, fs_dir->dentry);
		else
			error = aafs_create_file(fs_file, fs_dir->dentry);
		if (error)
			goto failed;
	}

	return 0;

failed:
	aafs_remove_dir(fs_dir);

	return error;
}

/**
 * aafs_remove_file - drop a single file entry in the apparmor securityfs
 * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL)
 */
static void __init aafs_remove_file(struct aa_fs_entry *fs_file)
{
	if (!fs_file->dentry)
		return;

	securityfs_remove(fs_file->dentry);
	fs_file->dentry = NULL;
}

/**
 * aafs_remove_dir - recursively drop a directory entry from the securityfs
 * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL)
 */
static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
{
	struct aa_fs_entry *fs_file;

	for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
		if (fs_file->v_type == AA_FS_TYPE_DIR)
			aafs_remove_dir(fs_file);
		else
			aafs_remove_file(fs_file);
	}

	aafs_remove_file(fs_dir);
}

/**
 * aa_destroy_aafs - cleanup and free aafs
 *
 * releases dentries allocated by aa_create_aafs
 */
void __init aa_destroy_aafs(void)
{
	aafs_remove_dir(&aa_fs_entry);
}


#define NULL_FILE_NAME ".null"
struct path aa_null;

static int aa_mk_null_file(struct dentry *parent)
{
	struct vfsmount *mount = NULL;
	struct dentry *dentry;
	struct inode *inode;
	int count = 0;
	int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);

	if (error)
		return error;

	inode_lock(d_inode(parent));
	dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
	if (IS_ERR(dentry)) {
		error = PTR_ERR(dentry);
		goto out;
	}
	inode = new_inode(parent->d_inode->i_sb);
	if (!inode) {
		error = -ENOMEM;
		goto out1;
	}

	inode->i_ino = get_next_ino();
	inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
			   MKDEV(MEM_MAJOR, 3));
	d_instantiate(dentry, inode);
	aa_null.dentry = dget(dentry);
	aa_null.mnt = mntget(mount);

	error = 0;

out1:
	dput(dentry);
out:
	inode_unlock(d_inode(parent));
	simple_release_fs(&mount, &count);
	return error;
}

/**
 * aa_create_aafs - create the apparmor security filesystem
 *
 * dentries created here are released by aa_destroy_aafs
 *
 * Returns: error on failure
 */
static int __init aa_create_aafs(void)
{
	struct dentry *dent;
	int error;

	if (!apparmor_initialized)
		return 0;

	if (aa_fs_entry.dentry) {
		AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
		return -EEXIST;
	}

	/* Populate fs tree. */
	error = aafs_create_dir(&aa_fs_entry, NULL);
	if (error)
		goto error;

	dent = securityfs_create_file(".load", 0666, aa_fs_entry.dentry,
				      NULL, &aa_fs_profile_load);
	if (IS_ERR(dent)) {
		error = PTR_ERR(dent);
		goto error;
	}
	ns_subload(root_ns) = dent;

	dent = securityfs_create_file(".replace", 0666, aa_fs_entry.dentry,
				      NULL, &aa_fs_profile_replace);
	if (IS_ERR(dent)) {
		error = PTR_ERR(dent);
		goto error;
	}
	ns_subreplace(root_ns) = dent;

	dent = securityfs_create_file(".remove", 0666, aa_fs_entry.dentry,
				      NULL, &aa_fs_profile_remove);
	if (IS_ERR(dent)) {
		error = PTR_ERR(dent);
		goto error;
	}
	ns_subremove(root_ns) = dent;

	mutex_lock(&root_ns->lock);
	error = __aa_fs_ns_mkdir(root_ns, aa_fs_entry.dentry, "policy");
	mutex_unlock(&root_ns->lock);

	if (error)
		goto error;

	error = aa_mk_null_file(aa_fs_entry.dentry);
	if (error)
		goto error;

	/* TODO: add default profile to apparmorfs */

	/* Report that AppArmor fs is enabled */
	aa_info_message("AppArmor Filesystem Enabled");
	return 0;

error:
	aa_destroy_aafs();
	AA_ERROR("Error creating AppArmor securityfs\n");
	return error;
}

fs_initcall(aa_create_aafs);