summaryrefslogtreecommitdiffstats
path: root/security/apparmor/policy_unpack.c
blob: 40c8dc617b13abb9ae6c1c35a41c2d039e8bb4fd (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
/*
 * AppArmor security module
 *
 * This file contains AppArmor functions for unpacking policy loaded from
 * userspace.
 *
 * 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.
 *
 * AppArmor uses a serialized binary format for loading policy. To find
 * policy format documentation see Documentation/admin-guide/LSM/apparmor.rst
 * All policy is validated before it is used.
 */

#include <asm/unaligned.h>
#include <linux/ctype.h>
#include <linux/errno.h>

#include "include/apparmor.h"
#include "include/audit.h"
#include "include/cred.h"
#include "include/crypto.h"
#include "include/match.h"
#include "include/path.h"
#include "include/policy.h"
#include "include/policy_unpack.h"

#define K_ABI_MASK 0x3ff
#define FORCE_COMPLAIN_FLAG 0x800
#define VERSION_LT(X, Y) (((X) & K_ABI_MASK) < ((Y) & K_ABI_MASK))
#define VERSION_GT(X, Y) (((X) & K_ABI_MASK) > ((Y) & K_ABI_MASK))

#define v5	5	/* base version */
#define v6	6	/* per entry policydb mediation check */
#define v7	7	/* full network masking */

/*
 * The AppArmor interface treats data as a type byte followed by the
 * actual data.  The interface has the notion of a a named entry
 * which has a name (AA_NAME typecode followed by name string) followed by
 * the entries typecode and data.  Named types allow for optional
 * elements and extensions to be added and tested for without breaking
 * backwards compatibility.
 */

enum aa_code {
	AA_U8,
	AA_U16,
	AA_U32,
	AA_U64,
	AA_NAME,		/* same as string except it is items name */
	AA_STRING,
	AA_BLOB,
	AA_STRUCT,
	AA_STRUCTEND,
	AA_LIST,
	AA_LISTEND,
	AA_ARRAY,
	AA_ARRAYEND,
};

/*
 * aa_ext is the read of the buffer containing the serialized profile.  The
 * data is copied into a kernel buffer in apparmorfs and then handed off to
 * the unpack routines.
 */
struct aa_ext {
	void *start;
	void *end;
	void *pos;		/* pointer to current position in the buffer */
	u32 version;
};

/* audit callback for unpack fields */
static void audit_cb(struct audit_buffer *ab, void *va)
{
	struct common_audit_data *sa = va;

	if (aad(sa)->iface.ns) {
		audit_log_format(ab, " ns=");
		audit_log_untrustedstring(ab, aad(sa)->iface.ns);
	}
	if (aad(sa)->name) {
		audit_log_format(ab, " name=");
		audit_log_untrustedstring(ab, aad(sa)->name);
	}
	if (aad(sa)->iface.pos)
		audit_log_format(ab, " offset=%ld", aad(sa)->iface.pos);
}

/**
 * audit_iface - do audit message for policy unpacking/load/replace/remove
 * @new: profile if it has been allocated (MAYBE NULL)
 * @ns_name: name of the ns the profile is to be loaded to (MAY BE NULL)
 * @name: name of the profile being manipulated (MAYBE NULL)
 * @info: any extra info about the failure (MAYBE NULL)
 * @e: buffer position info
 * @error: error code
 *
 * Returns: %0 or error
 */
static int audit_iface(struct aa_profile *new, const char *ns_name,
		       const char *name, const char *info, struct aa_ext *e,
		       int error)
{
	struct aa_profile *profile = labels_profile(aa_current_raw_label());
	DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, NULL);
	if (e)
		aad(&sa)->iface.pos = e->pos - e->start;
	aad(&sa)->iface.ns = ns_name;
	if (new)
		aad(&sa)->name = new->base.hname;
	else
		aad(&sa)->name = name;
	aad(&sa)->info = info;
	aad(&sa)->error = error;

	return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb);
}

void __aa_loaddata_update(struct aa_loaddata *data, long revision)
{
	AA_BUG(!data);
	AA_BUG(!data->ns);
	AA_BUG(!data->dents[AAFS_LOADDATA_REVISION]);
	AA_BUG(!mutex_is_locked(&data->ns->lock));
	AA_BUG(data->revision > revision);

	data->revision = revision;
	d_inode(data->dents[AAFS_LOADDATA_DIR])->i_mtime =
		current_time(d_inode(data->dents[AAFS_LOADDATA_DIR]));
	d_inode(data->dents[AAFS_LOADDATA_REVISION])->i_mtime =
		current_time(d_inode(data->dents[AAFS_LOADDATA_REVISION]));
}

bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r)
{
	if (l->size != r->size)
		return false;
	if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0)
		return false;
	return memcmp(l->data, r->data, r->size) == 0;
}

/*
 * need to take the ns mutex lock which is NOT safe most places that
 * put_loaddata is called, so we have to delay freeing it
 */
static void do_loaddata_free(struct work_struct *work)
{
	struct aa_loaddata *d = container_of(work, struct aa_loaddata, work);
	struct aa_ns *ns = aa_get_ns(d->ns);

	if (ns) {
		mutex_lock_nested(&ns->lock, ns->level);
		__aa_fs_remove_rawdata(d);
		mutex_unlock(&ns->lock);
		aa_put_ns(ns);
	}

	kzfree(d->hash);
	kzfree(d->name);
	kvfree(d->data);
	kzfree(d);
}

void aa_loaddata_kref(struct kref *kref)
{
	struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count);

	if (d) {
		INIT_WORK(&d->work, do_loaddata_free);
		schedule_work(&d->work);
	}
}

struct aa_loaddata *aa_loaddata_alloc(size_t size)
{
	struct aa_loaddata *d;

	d = kzalloc(sizeof(*d), GFP_KERNEL);
	if (d == NULL)
		return ERR_PTR(-ENOMEM);
	d->data = kvzalloc(size, GFP_KERNEL);
	if (!d->data) {
		kfree(d);
		return ERR_PTR(-ENOMEM);
	}
	kref_init(&d->count);
	INIT_LIST_HEAD(&d->list);

	return d;
}

/* test if read will be in packed data bounds */
static bool inbounds(struct aa_ext *e, size_t size)
{
	return (size <= e->end - e->pos);
}

/**
 * aa_u16_chunck - test and do bounds checking for a u16 size based chunk
 * @e: serialized data read head (NOT NULL)
 * @chunk: start address for chunk of data (NOT NULL)
 *
 * Returns: the size of chunk found with the read head at the end of the chunk.
 */
static size_t unpack_u16_chunk(struct aa_ext *e, char **chunk)
{
	size_t size = 0;

	if (!inbounds(e, sizeof(u16)))
		return 0;
	size = le16_to_cpu(get_unaligned((__le16 *) e->pos));
	e->pos += sizeof(__le16);
	if (!inbounds(e, size))
		return 0;
	*chunk = e->pos;
	e->pos += size;
	return size;
}

/* unpack control byte */
static bool unpack_X(struct aa_ext *e, enum aa_code code)
{
	if (!inbounds(e, 1))
		return 0;
	if (*(u8 *) e->pos != code)
		return 0;
	e->pos++;
	return 1;
}

/**
 * unpack_nameX - check is the next element is of type X with a name of @name
 * @e: serialized data extent information  (NOT NULL)
 * @code: type code
 * @name: name to match to the serialized element.  (MAYBE NULL)
 *
 * check that the next serialized data element is of type X and has a tag
 * name @name.  If @name is specified then there must be a matching
 * name element in the stream.  If @name is NULL any name element will be
 * skipped and only the typecode will be tested.
 *
 * Returns 1 on success (both type code and name tests match) and the read
 * head is advanced past the headers
 *
 * Returns: 0 if either match fails, the read head does not move
 */
static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
{
	/*
	 * May need to reset pos if name or type doesn't match
	 */
	void *pos = e->pos;
	/*
	 * Check for presence of a tagname, and if present name size
	 * AA_NAME tag value is a u16.
	 */
	if (unpack_X(e, AA_NAME)) {
		char *tag = NULL;
		size_t size = unpack_u16_chunk(e, &tag);
		/* if a name is specified it must match. otherwise skip tag */
		if (name && (!size || strcmp(name, tag)))
			goto fail;
	} else if (name) {
		/* if a name is specified and there is no name tag fail */
		goto fail;
	}

	/* now check if type code matches */
	if (unpack_X(e, code))
		return 1;

fail:
	e->pos = pos;
	return 0;
}

static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
{
	if (unpack_nameX(e, AA_U32, name)) {
		if (!inbounds(e, sizeof(u32)))
			return 0;
		if (data)
			*data = le32_to_cpu(get_unaligned((__le32 *) e->pos));
		e->pos += sizeof(u32);
		return 1;
	}
	return 0;
}

static bool unpack_u64(struct aa_ext *e, u64 *data, const char *name)
{
	if (unpack_nameX(e, AA_U64, name)) {
		if (!inbounds(e, sizeof(u64)))
			return 0;
		if (data)
			*data = le64_to_cpu(get_unaligned((__le64 *) e->pos));
		e->pos += sizeof(u64);
		return 1;
	}
	return 0;
}

static size_t unpack_array(struct aa_ext *e, const char *name)
{
	if (unpack_nameX(e, AA_ARRAY, name)) {
		int size;
		if (!inbounds(e, sizeof(u16)))
			return 0;
		size = (int)le16_to_cpu(get_unaligned((__le16 *) e->pos));
		e->pos += sizeof(u16);
		return size;
	}
	return 0;
}

static size_t unpack_blob(struct aa_ext *e, char **blob, const char *name)
{
	if (unpack_nameX(e, AA_BLOB, name)) {
		u32 size;
		if (!inbounds(e, sizeof(u32)))
			return 0;
		size = le32_to_cpu(get_unaligned((__le32 *) e->pos));
		e->pos += sizeof(u32);
		if (inbounds(e, (size_t) size)) {
			*blob = e->pos;
			e->pos += size;
			return size;
		}
	}
	return 0;
}

static int unpack_str(struct aa_ext *e, const char **string, const char *name)
{
	char *src_str;
	size_t size = 0;
	void *pos = e->pos;
	*string = NULL;
	if (unpack_nameX(e, AA_STRING, name)) {
		size = unpack_u16_chunk(e, &src_str);
		if (size) {
			/* strings are null terminated, length is size - 1 */
			if (src_str[size - 1] != 0)
				goto fail;
			*string = src_str;
		}
	}
	return size;

fail:
	e->pos = pos;
	return 0;
}

static int unpack_strdup(struct aa_ext *e, char **string, const char *name)
{
	const char *tmp;
	void *pos = e->pos;
	int res = unpack_str(e, &tmp, name);
	*string = NULL;

	if (!res)
		return 0;

	*string = kmemdup(tmp, res, GFP_KERNEL);
	if (!*string) {
		e->pos = pos;
		return 0;
	}

	return res;
}

#define DFA_VALID_PERM_MASK		0xffffffff
#define DFA_VALID_PERM2_MASK		0xffffffff

/**
 * verify_accept - verify the accept tables of a dfa
 * @dfa: dfa to verify accept tables of (NOT NULL)
 * @flags: flags governing dfa
 *
 * Returns: 1 if valid accept tables else 0 if error
 */
static bool verify_accept(struct aa_dfa *dfa, int flags)
{
	int i;

	/* verify accept permissions */
	for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
		int mode = ACCEPT_TABLE(dfa)[i];

		if (mode & ~DFA_VALID_PERM_MASK)
			return 0;

		if (ACCEPT_TABLE2(dfa)[i] & ~DFA_VALID_PERM2_MASK)
			return 0;
	}
	return 1;
}

/**
 * unpack_dfa - unpack a file rule dfa
 * @e: serialized data extent information (NOT NULL)
 *
 * returns dfa or ERR_PTR or NULL if no dfa
 */
static struct aa_dfa *unpack_dfa(struct aa_ext *e)
{
	char *blob = NULL;
	size_t size;
	struct aa_dfa *dfa = NULL;

	size = unpack_blob(e, &blob, "aadfa");
	if (size) {
		/*
		 * The dfa is aligned with in the blob to 8 bytes
		 * from the beginning of the stream.
		 * alignment adjust needed by dfa unpack
		 */
		size_t sz = blob - (char *) e->start -
			((e->pos - e->start) & 7);
		size_t pad = ALIGN(sz, 8) - sz;
		int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
			TO_ACCEPT2_FLAG(YYTD_DATA32) | DFA_FLAG_VERIFY_STATES;
		dfa = aa_dfa_unpack(blob + pad, size - pad, flags);

		if (IS_ERR(dfa))
			return dfa;

		if (!verify_accept(dfa, flags))
			goto fail;
	}

	return dfa;

fail:
	aa_put_dfa(dfa);
	return ERR_PTR(-EPROTO);
}

/**
 * unpack_trans_table - unpack a profile transition table
 * @e: serialized data extent information  (NOT NULL)
 * @profile: profile to add the accept table to (NOT NULL)
 *
 * Returns: 1 if table successfully unpacked
 */
static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
{
	void *saved_pos = e->pos;

	/* exec table is optional */
	if (unpack_nameX(e, AA_STRUCT, "xtable")) {
		int i, size;

		size = unpack_array(e, NULL);
		/* currently 4 exec bits and entries 0-3 are reserved iupcx */
		if (size > 16 - 4)
			goto fail;
		profile->file.trans.table = kzalloc(sizeof(char *) * size,
						    GFP_KERNEL);
		if (!profile->file.trans.table)
			goto fail;

		profile->file.trans.size = size;
		for (i = 0; i < size; i++) {
			char *str;
			int c, j, pos, size2 = unpack_strdup(e, &str, NULL);
			/* unpack_strdup verifies that the last character is
			 * null termination byte.
			 */
			if (!size2)
				goto fail;
			profile->file.trans.table[i] = str;
			/* verify that name doesn't start with space */
			if (isspace(*str))
				goto fail;

			/* count internal #  of internal \0 */
			for (c = j = 0; j < size2 - 1; j++) {
				if (!str[j]) {
					pos = j;
					c++;
				}
			}
			if (*str == ':') {
				/* first character after : must be valid */
				if (!str[1])
					goto fail;
				/* beginning with : requires an embedded \0,
				 * verify that exactly 1 internal \0 exists
				 * trailing \0 already verified by unpack_strdup
				 *
				 * convert \0 back to : for label_parse
				 */
				if (c == 1)
					str[pos] = ':';
				else if (c > 1)
					goto fail;
			} else if (c)
				/* fail - all other cases with embedded \0 */
				goto fail;
		}
		if (!unpack_nameX(e, AA_ARRAYEND, NULL))
			goto fail;
		if (!unpack_nameX(e, AA_STRUCTEND, NULL))
			goto fail;
	}
	return 1;

fail:
	aa_free_domain_entries(&profile->file.trans);
	e->pos = saved_pos;
	return 0;
}

static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile)
{
	void *pos = e->pos;

	/* rlimits are optional */
	if (unpack_nameX(e, AA_STRUCT, "rlimits")) {
		int i, size;
		u32 tmp = 0;
		if (!unpack_u32(e, &tmp, NULL))
			goto fail;
		profile->rlimits.mask = tmp;

		size = unpack_array(e, NULL);
		if (size > RLIM_NLIMITS)
			goto fail;
		for (i = 0; i < size; i++) {
			u64 tmp2 = 0;
			int a = aa_map_resource(i);
			if (!unpack_u64(e, &tmp2, NULL))
				goto fail;
			profile->rlimits.limits[a].rlim_max = tmp2;
		}
		if (!unpack_nameX(e, AA_ARRAYEND, NULL))
			goto fail;
		if (!unpack_nameX(e, AA_STRUCTEND, NULL))
			goto fail;
	}
	return 1;

fail:
	e->pos = pos;
	return 0;
}

static void *kvmemdup(const void *src, size_t len)
{
	void *p = kvmalloc(len, GFP_KERNEL);

	if (p)
		memcpy(p, src, len);
	return p;
}

static u32 strhash(const void *data, u32 len, u32 seed)
{
	const char * const *key = data;

	return jhash(*key, strlen(*key), seed);
}

static int datacmp(struct rhashtable_compare_arg *arg, const void *obj)
{
	const struct aa_data *data = obj;
	const char * const *key = arg->key;

	return strcmp(data->key, *key);
}

/**
 * unpack_profile - unpack a serialized profile
 * @e: serialized data extent information (NOT NULL)
 *
 * NOTE: unpack profile sets audit struct if there is a failure
 */
static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
{
	struct aa_profile *profile = NULL;
	const char *tmpname, *tmpns = NULL, *name = NULL;
	const char *info = "failed to unpack profile";
	size_t ns_len;
	struct rhashtable_params params = { 0 };
	char *key = NULL;
	struct aa_data *data;
	int i, error = -EPROTO;
	kernel_cap_t tmpcap;
	u32 tmp;

	*ns_name = NULL;

	/* check that we have the right struct being passed */
	if (!unpack_nameX(e, AA_STRUCT, "profile"))
		goto fail;
	if (!unpack_str(e, &name, NULL))
		goto fail;
	if (*name == '\0')
		goto fail;

	tmpname = aa_splitn_fqname(name, strlen(name), &tmpns, &ns_len);
	if (tmpns) {
		*ns_name = kstrndup(tmpns, ns_len, GFP_KERNEL);
		if (!*ns_name) {
			info = "out of memory";
			goto fail;
		}
		name = tmpname;
	}

	profile = aa_alloc_profile(name, NULL, GFP_KERNEL);
	if (!profile)
		return ERR_PTR(-ENOMEM);

	/* profile renaming is optional */
	(void) unpack_str(e, &profile->rename, "rename");

	/* attachment string is optional */
	(void) unpack_str(e, &profile->attach, "attach");

	/* xmatch is optional and may be NULL */
	profile->xmatch = unpack_dfa(e);
	if (IS_ERR(profile->xmatch)) {
		error = PTR_ERR(profile->xmatch);
		profile->xmatch = NULL;
		info = "bad xmatch";
		goto fail;
	}
	/* xmatch_len is not optional if xmatch is set */
	if (profile->xmatch) {
		if (!unpack_u32(e, &tmp, NULL)) {
			info = "missing xmatch len";
			goto fail;
		}
		profile->xmatch_len = tmp;
	}

	/* disconnected attachment string is optional */
	(void) unpack_str(e, &profile->disconnected, "disconnected");

	/* per profile debug flags (complain, audit) */
	if (!unpack_nameX(e, AA_STRUCT, "flags")) {
		info = "profile missing flags";
		goto fail;
	}
	info = "failed to unpack profile flags";
	if (!unpack_u32(e, &tmp, NULL))
		goto fail;
	if (tmp & PACKED_FLAG_HAT)
		profile->label.flags |= FLAG_HAT;
	if (!unpack_u32(e, &tmp, NULL))
		goto fail;
	if (tmp == PACKED_MODE_COMPLAIN || (e->version & FORCE_COMPLAIN_FLAG))
		profile->mode = APPARMOR_COMPLAIN;
	else if (tmp == PACKED_MODE_KILL)
		profile->mode = APPARMOR_KILL;
	else if (tmp == PACKED_MODE_UNCONFINED)
		profile->mode = APPARMOR_UNCONFINED;
	if (!unpack_u32(e, &tmp, NULL))
		goto fail;
	if (tmp)
		profile->audit = AUDIT_ALL;

	if (!unpack_nameX(e, AA_STRUCTEND, NULL))
		goto fail;

	/* path_flags is optional */
	if (unpack_u32(e, &profile->path_flags, "path_flags"))
		profile->path_flags |= profile->label.flags &
			PATH_MEDIATE_DELETED;
	else
		/* set a default value if path_flags field is not present */
		profile->path_flags = PATH_MEDIATE_DELETED;

	info = "failed to unpack profile capabilities";
	if (!unpack_u32(e, &(profile->caps.allow.cap[0]), NULL))
		goto fail;
	if (!unpack_u32(e, &(profile->caps.audit.cap[0]), NULL))
		goto fail;
	if (!unpack_u32(e, &(profile->caps.quiet.cap[0]), NULL))
		goto fail;
	if (!unpack_u32(e, &tmpcap.cap[0], NULL))
		goto fail;

	info = "failed to unpack upper profile capabilities";
	if (unpack_nameX(e, AA_STRUCT, "caps64")) {
		/* optional upper half of 64 bit caps */
		if (!unpack_u32(e, &(profile->caps.allow.cap[1]), NULL))
			goto fail;
		if (!unpack_u32(e, &(profile->caps.audit.cap[1]), NULL))
			goto fail;
		if (!unpack_u32(e, &(profile->caps.quiet.cap[1]), NULL))
			goto fail;
		if (!unpack_u32(e, &(tmpcap.cap[1]), NULL))
			goto fail;
		if (!unpack_nameX(e, AA_STRUCTEND, NULL))
			goto fail;
	}

	info = "failed to unpack extended profile capabilities";
	if (unpack_nameX(e, AA_STRUCT, "capsx")) {
		/* optional extended caps mediation mask */
		if (!unpack_u32(e, &(profile->caps.extended.cap[0]), NULL))
			goto fail;
		if (!unpack_u32(e, &(profile->caps.extended.cap[1]), NULL))
			goto fail;
		if (!unpack_nameX(e, AA_STRUCTEND, NULL))
			goto fail;
	}

	if (!unpack_rlimits(e, profile)) {
		info = "failed to unpack profile rlimits";
		goto fail;
	}

	if (unpack_nameX(e, AA_STRUCT, "policydb")) {
		/* generic policy dfa - optional and may be NULL */
		info = "failed to unpack policydb";
		profile->policy.dfa = unpack_dfa(e);
		if (IS_ERR(profile->policy.dfa)) {
			error = PTR_ERR(profile->policy.dfa);
			profile->policy.dfa = NULL;
			goto fail;
		} else if (!profile->policy.dfa) {
			error = -EPROTO;
			goto fail;
		}
		if (!unpack_u32(e, &profile->policy.start[0], "start"))
			/* default start state */
			profile->policy.start[0] = DFA_START;
		/* setup class index */
		for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) {
			profile->policy.start[i] =
				aa_dfa_next(profile->policy.dfa,
					    profile->policy.start[0],
					    i);
		}
		if (!unpack_nameX(e, AA_STRUCTEND, NULL))
			goto fail;
	} else
		profile->policy.dfa = aa_get_dfa(nulldfa);

	/* get file rules */
	profile->file.dfa = unpack_dfa(e);
	if (IS_ERR(profile->file.dfa)) {
		error = PTR_ERR(profile->file.dfa);
		profile->file.dfa = NULL;
		info = "failed to unpack profile file rules";
		goto fail;
	} else if (profile->file.dfa) {
		if (!unpack_u32(e, &profile->file.start, "dfa_start"))
			/* default start state */
			profile->file.start = DFA_START;
	} else if (profile->policy.dfa &&
		   profile->policy.start[AA_CLASS_FILE]) {
		profile->file.dfa = aa_get_dfa(profile->policy.dfa);
		profile->file.start = profile->policy.start[AA_CLASS_FILE];
	} else
		profile->file.dfa = aa_get_dfa(nulldfa);

	if (!unpack_trans_table(e, profile)) {
		info = "failed to unpack profile transition table";
		goto fail;
	}

	if (unpack_nameX(e, AA_STRUCT, "data")) {
		info = "out of memory";
		profile->data = kzalloc(sizeof(*profile->data), GFP_KERNEL);
		if (!profile->data)
			goto fail;

		params.nelem_hint = 3;
		params.key_len = sizeof(void *);
		params.key_offset = offsetof(struct aa_data, key);
		params.head_offset = offsetof(struct aa_data, head);
		params.hashfn = strhash;
		params.obj_cmpfn = datacmp;

		if (rhashtable_init(profile->data, &params)) {
			info = "failed to init key, value hash table";
			goto fail;
		}

		while (unpack_strdup(e, &key, NULL)) {
			data = kzalloc(sizeof(*data), GFP_KERNEL);
			if (!data) {
				kzfree(key);
				goto fail;
			}

			data->key = key;
			data->size = unpack_blob(e, &data->data, NULL);
			data->data = kvmemdup(data->data, data->size);
			if (data->size && !data->data) {
				kzfree(data->key);
				kzfree(data);
				goto fail;
			}

			rhashtable_insert_fast(profile->data, &data->head,
					       profile->data->p);
		}

		if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
			info = "failed to unpack end of key, value data table";
			goto fail;
		}
	}

	if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
		info = "failed to unpack end of profile";
		goto fail;
	}

	return profile;

fail:
	if (profile)
		name = NULL;
	else if (!name)
		name = "unknown";
	audit_iface(profile, NULL, name, info, e, error);
	aa_free_profile(profile);

	return ERR_PTR(error);
}

/**
 * verify_head - unpack serialized stream header
 * @e: serialized data read head (NOT NULL)
 * @required: whether the header is required or optional
 * @ns: Returns - namespace if one is specified else NULL (NOT NULL)
 *
 * Returns: error or 0 if header is good
 */
static int verify_header(struct aa_ext *e, int required, const char **ns)
{
	int error = -EPROTONOSUPPORT;
	const char *name = NULL;
	*ns = NULL;

	/* get the interface version */
	if (!unpack_u32(e, &e->version, "version")) {
		if (required) {
			audit_iface(NULL, NULL, NULL, "invalid profile format",
				    e, error);
			return error;
		}
	}

	/* Check that the interface version is currently supported.
	 * if not specified use previous version
	 * Mask off everything that is not kernel abi version
	 */
	if (VERSION_LT(e->version, v5) || VERSION_GT(e->version, v7)) {
		audit_iface(NULL, NULL, NULL, "unsupported interface version",
			    e, error);
		return error;
	}

	/* read the namespace if present */
	if (unpack_str(e, &name, "namespace")) {
		if (*name == '\0') {
			audit_iface(NULL, NULL, NULL, "invalid namespace name",
				    e, error);
			return error;
		}
		if (*ns && strcmp(*ns, name))
			audit_iface(NULL, NULL, NULL, "invalid ns change", e,
				    error);
		else if (!*ns)
			*ns = name;
	}

	return 0;
}

static bool verify_xindex(int xindex, int table_size)
{
	int index, xtype;
	xtype = xindex & AA_X_TYPE_MASK;
	index = xindex & AA_X_INDEX_MASK;
	if (xtype == AA_X_TABLE && index >= table_size)
		return 0;
	return 1;
}

/* verify dfa xindexes are in range of transition tables */
static bool verify_dfa_xindex(struct aa_dfa *dfa, int table_size)
{
	int i;
	for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
		if (!verify_xindex(dfa_user_xindex(dfa, i), table_size))
			return 0;
		if (!verify_xindex(dfa_other_xindex(dfa, i), table_size))
			return 0;
	}
	return 1;
}

/**
 * verify_profile - Do post unpack analysis to verify profile consistency
 * @profile: profile to verify (NOT NULL)
 *
 * Returns: 0 if passes verification else error
 */
static int verify_profile(struct aa_profile *profile)
{
	if (profile->file.dfa &&
	    !verify_dfa_xindex(profile->file.dfa,
			       profile->file.trans.size)) {
		audit_iface(profile, NULL, NULL, "Invalid named transition",
			    NULL, -EPROTO);
		return -EPROTO;
	}

	return 0;
}

void aa_load_ent_free(struct aa_load_ent *ent)
{
	if (ent) {
		aa_put_profile(ent->rename);
		aa_put_profile(ent->old);
		aa_put_profile(ent->new);
		kfree(ent->ns_name);
		kzfree(ent);
	}
}

struct aa_load_ent *aa_load_ent_alloc(void)
{
	struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
	if (ent)
		INIT_LIST_HEAD(&ent->list);
	return ent;
}

/**
 * aa_unpack - unpack packed binary profile(s) data loaded from user space
 * @udata: user data copied to kmem  (NOT NULL)
 * @lh: list to place unpacked profiles in a aa_repl_ws
 * @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
 *
 * Unpack user data and return refcounted allocated profile(s) stored in
 * @lh in order of discovery, with the list chain stored in base.list
 * or error
 *
 * Returns: profile(s) on @lh else error pointer if fails to unpack
 */
int aa_unpack(struct aa_loaddata *udata, struct list_head *lh,
	      const char **ns)
{
	struct aa_load_ent *tmp, *ent;
	struct aa_profile *profile = NULL;
	int error;
	struct aa_ext e = {
		.start = udata->data,
		.end = udata->data + udata->size,
		.pos = udata->data,
	};

	*ns = NULL;
	while (e.pos < e.end) {
		char *ns_name = NULL;
		void *start;
		error = verify_header(&e, e.pos == e.start, ns);
		if (error)
			goto fail;

		start = e.pos;
		profile = unpack_profile(&e, &ns_name);
		if (IS_ERR(profile)) {
			error = PTR_ERR(profile);
			goto fail;
		}

		error = verify_profile(profile);
		if (error)
			goto fail_profile;

		if (aa_g_hash_policy)
			error = aa_calc_profile_hash(profile, e.version, start,
						     e.pos - start);
		if (error)
			goto fail_profile;

		ent = aa_load_ent_alloc();
		if (!ent) {
			error = -ENOMEM;
			goto fail_profile;
		}

		ent->new = profile;
		ent->ns_name = ns_name;
		list_add_tail(&ent->list, lh);
	}
	udata->abi = e.version & K_ABI_MASK;
	if (aa_g_hash_policy) {
		udata->hash = aa_calc_hash(udata->data, udata->size);
		if (IS_ERR(udata->hash)) {
			error = PTR_ERR(udata->hash);
			udata->hash = NULL;
			goto fail;
		}
	}
	return 0;

fail_profile:
	aa_put_profile(profile);

fail:
	list_for_each_entry_safe(ent, tmp, lh, list) {
		list_del_init(&ent->list);
		aa_load_ent_free(ent);
	}

	return error;
}