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16#include <asm/unaligned.h>
17#include <linux/ctype.h>
18#include <linux/errno.h>
19#include <linux/zlib.h>
20
21#include "include/apparmor.h"
22#include "include/audit.h"
23#include "include/cred.h"
24#include "include/crypto.h"
25#include "include/match.h"
26#include "include/path.h"
27#include "include/policy.h"
28#include "include/policy_unpack.h"
29
30#define K_ABI_MASK 0x3ff
31#define FORCE_COMPLAIN_FLAG 0x800
32#define VERSION_LT(X, Y) (((X) & K_ABI_MASK) < ((Y) & K_ABI_MASK))
33#define VERSION_GT(X, Y) (((X) & K_ABI_MASK) > ((Y) & K_ABI_MASK))
34
35#define v5 5
36#define v6 6
37#define v7 7
38#define v8 8
39
40
41
42
43
44
45
46
47
48
49enum aa_code {
50 AA_U8,
51 AA_U16,
52 AA_U32,
53 AA_U64,
54 AA_NAME,
55 AA_STRING,
56 AA_BLOB,
57 AA_STRUCT,
58 AA_STRUCTEND,
59 AA_LIST,
60 AA_LISTEND,
61 AA_ARRAY,
62 AA_ARRAYEND,
63};
64
65
66
67
68
69
70struct aa_ext {
71 void *start;
72 void *end;
73 void *pos;
74 u32 version;
75};
76
77
78static void audit_cb(struct audit_buffer *ab, void *va)
79{
80 struct common_audit_data *sa = va;
81
82 if (aad(sa)->iface.ns) {
83 audit_log_format(ab, " ns=");
84 audit_log_untrustedstring(ab, aad(sa)->iface.ns);
85 }
86 if (aad(sa)->name) {
87 audit_log_format(ab, " name=");
88 audit_log_untrustedstring(ab, aad(sa)->name);
89 }
90 if (aad(sa)->iface.pos)
91 audit_log_format(ab, " offset=%ld", aad(sa)->iface.pos);
92}
93
94
95
96
97
98
99
100
101
102
103
104
105static int audit_iface(struct aa_profile *new, const char *ns_name,
106 const char *name, const char *info, struct aa_ext *e,
107 int error)
108{
109 struct aa_profile *profile = labels_profile(aa_current_raw_label());
110 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, NULL);
111 if (e)
112 aad(&sa)->iface.pos = e->pos - e->start;
113 aad(&sa)->iface.ns = ns_name;
114 if (new)
115 aad(&sa)->name = new->base.hname;
116 else
117 aad(&sa)->name = name;
118 aad(&sa)->info = info;
119 aad(&sa)->error = error;
120
121 return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb);
122}
123
124void __aa_loaddata_update(struct aa_loaddata *data, long revision)
125{
126 AA_BUG(!data);
127 AA_BUG(!data->ns);
128 AA_BUG(!data->dents[AAFS_LOADDATA_REVISION]);
129 AA_BUG(!mutex_is_locked(&data->ns->lock));
130 AA_BUG(data->revision > revision);
131
132 data->revision = revision;
133 d_inode(data->dents[AAFS_LOADDATA_DIR])->i_mtime =
134 current_time(d_inode(data->dents[AAFS_LOADDATA_DIR]));
135 d_inode(data->dents[AAFS_LOADDATA_REVISION])->i_mtime =
136 current_time(d_inode(data->dents[AAFS_LOADDATA_REVISION]));
137}
138
139bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r)
140{
141 if (l->size != r->size)
142 return false;
143 if (l->compressed_size != r->compressed_size)
144 return false;
145 if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0)
146 return false;
147 return memcmp(l->data, r->data, r->compressed_size ?: r->size) == 0;
148}
149
150
151
152
153
154static void do_loaddata_free(struct work_struct *work)
155{
156 struct aa_loaddata *d = container_of(work, struct aa_loaddata, work);
157 struct aa_ns *ns = aa_get_ns(d->ns);
158
159 if (ns) {
160 mutex_lock_nested(&ns->lock, ns->level);
161 __aa_fs_remove_rawdata(d);
162 mutex_unlock(&ns->lock);
163 aa_put_ns(ns);
164 }
165
166 kfree_sensitive(d->hash);
167 kfree_sensitive(d->name);
168 kvfree(d->data);
169 kfree_sensitive(d);
170}
171
172void aa_loaddata_kref(struct kref *kref)
173{
174 struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count);
175
176 if (d) {
177 INIT_WORK(&d->work, do_loaddata_free);
178 schedule_work(&d->work);
179 }
180}
181
182struct aa_loaddata *aa_loaddata_alloc(size_t size)
183{
184 struct aa_loaddata *d;
185
186 d = kzalloc(sizeof(*d), GFP_KERNEL);
187 if (d == NULL)
188 return ERR_PTR(-ENOMEM);
189 d->data = kvzalloc(size, GFP_KERNEL);
190 if (!d->data) {
191 kfree(d);
192 return ERR_PTR(-ENOMEM);
193 }
194 kref_init(&d->count);
195 INIT_LIST_HEAD(&d->list);
196
197 return d;
198}
199
200
201static bool inbounds(struct aa_ext *e, size_t size)
202{
203 return (size <= e->end - e->pos);
204}
205
206static void *kvmemdup(const void *src, size_t len)
207{
208 void *p = kvmalloc(len, GFP_KERNEL);
209
210 if (p)
211 memcpy(p, src, len);
212 return p;
213}
214
215
216
217
218
219
220
221
222static size_t unpack_u16_chunk(struct aa_ext *e, char **chunk)
223{
224 size_t size = 0;
225 void *pos = e->pos;
226
227 if (!inbounds(e, sizeof(u16)))
228 goto fail;
229 size = le16_to_cpu(get_unaligned((__le16 *) e->pos));
230 e->pos += sizeof(__le16);
231 if (!inbounds(e, size))
232 goto fail;
233 *chunk = e->pos;
234 e->pos += size;
235 return size;
236
237fail:
238 e->pos = pos;
239 return 0;
240}
241
242
243static bool unpack_X(struct aa_ext *e, enum aa_code code)
244{
245 if (!inbounds(e, 1))
246 return false;
247 if (*(u8 *) e->pos != code)
248 return false;
249 e->pos++;
250 return true;
251}
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
270{
271
272
273
274 void *pos = e->pos;
275
276
277
278
279 if (unpack_X(e, AA_NAME)) {
280 char *tag = NULL;
281 size_t size = unpack_u16_chunk(e, &tag);
282
283 if (name && (!size || tag[size-1] != '\0' || strcmp(name, tag)))
284 goto fail;
285 } else if (name) {
286
287 goto fail;
288 }
289
290
291 if (unpack_X(e, code))
292 return true;
293
294fail:
295 e->pos = pos;
296 return false;
297}
298
299static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name)
300{
301 void *pos = e->pos;
302
303 if (unpack_nameX(e, AA_U8, name)) {
304 if (!inbounds(e, sizeof(u8)))
305 goto fail;
306 if (data)
307 *data = *((u8 *)e->pos);
308 e->pos += sizeof(u8);
309 return true;
310 }
311
312fail:
313 e->pos = pos;
314 return false;
315}
316
317static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
318{
319 void *pos = e->pos;
320
321 if (unpack_nameX(e, AA_U32, name)) {
322 if (!inbounds(e, sizeof(u32)))
323 goto fail;
324 if (data)
325 *data = le32_to_cpu(get_unaligned((__le32 *) e->pos));
326 e->pos += sizeof(u32);
327 return true;
328 }
329
330fail:
331 e->pos = pos;
332 return false;
333}
334
335static bool unpack_u64(struct aa_ext *e, u64 *data, const char *name)
336{
337 void *pos = e->pos;
338
339 if (unpack_nameX(e, AA_U64, name)) {
340 if (!inbounds(e, sizeof(u64)))
341 goto fail;
342 if (data)
343 *data = le64_to_cpu(get_unaligned((__le64 *) e->pos));
344 e->pos += sizeof(u64);
345 return true;
346 }
347
348fail:
349 e->pos = pos;
350 return false;
351}
352
353static size_t unpack_array(struct aa_ext *e, const char *name)
354{
355 void *pos = e->pos;
356
357 if (unpack_nameX(e, AA_ARRAY, name)) {
358 int size;
359 if (!inbounds(e, sizeof(u16)))
360 goto fail;
361 size = (int)le16_to_cpu(get_unaligned((__le16 *) e->pos));
362 e->pos += sizeof(u16);
363 return size;
364 }
365
366fail:
367 e->pos = pos;
368 return 0;
369}
370
371static size_t unpack_blob(struct aa_ext *e, char **blob, const char *name)
372{
373 void *pos = e->pos;
374
375 if (unpack_nameX(e, AA_BLOB, name)) {
376 u32 size;
377 if (!inbounds(e, sizeof(u32)))
378 goto fail;
379 size = le32_to_cpu(get_unaligned((__le32 *) e->pos));
380 e->pos += sizeof(u32);
381 if (inbounds(e, (size_t) size)) {
382 *blob = e->pos;
383 e->pos += size;
384 return size;
385 }
386 }
387
388fail:
389 e->pos = pos;
390 return 0;
391}
392
393static int unpack_str(struct aa_ext *e, const char **string, const char *name)
394{
395 char *src_str;
396 size_t size = 0;
397 void *pos = e->pos;
398 *string = NULL;
399 if (unpack_nameX(e, AA_STRING, name)) {
400 size = unpack_u16_chunk(e, &src_str);
401 if (size) {
402
403 if (src_str[size - 1] != 0)
404 goto fail;
405 *string = src_str;
406
407 return size;
408 }
409 }
410
411fail:
412 e->pos = pos;
413 return 0;
414}
415
416static int unpack_strdup(struct aa_ext *e, char **string, const char *name)
417{
418 const char *tmp;
419 void *pos = e->pos;
420 int res = unpack_str(e, &tmp, name);
421 *string = NULL;
422
423 if (!res)
424 return 0;
425
426 *string = kmemdup(tmp, res, GFP_KERNEL);
427 if (!*string) {
428 e->pos = pos;
429 return 0;
430 }
431
432 return res;
433}
434
435
436
437
438
439
440
441
442static struct aa_dfa *unpack_dfa(struct aa_ext *e)
443{
444 char *blob = NULL;
445 size_t size;
446 struct aa_dfa *dfa = NULL;
447
448 size = unpack_blob(e, &blob, "aadfa");
449 if (size) {
450
451
452
453
454
455 size_t sz = blob - (char *) e->start -
456 ((e->pos - e->start) & 7);
457 size_t pad = ALIGN(sz, 8) - sz;
458 int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
459 TO_ACCEPT2_FLAG(YYTD_DATA32) | DFA_FLAG_VERIFY_STATES;
460 dfa = aa_dfa_unpack(blob + pad, size - pad, flags);
461
462 if (IS_ERR(dfa))
463 return dfa;
464
465 }
466
467 return dfa;
468}
469
470
471
472
473
474
475
476
477static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
478{
479 void *saved_pos = e->pos;
480
481
482 if (unpack_nameX(e, AA_STRUCT, "xtable")) {
483 int i, size;
484
485 size = unpack_array(e, NULL);
486
487 if (size > 16 - 4)
488 goto fail;
489 profile->file.trans.table = kcalloc(size, sizeof(char *),
490 GFP_KERNEL);
491 if (!profile->file.trans.table)
492 goto fail;
493
494 profile->file.trans.size = size;
495 for (i = 0; i < size; i++) {
496 char *str;
497 int c, j, pos, size2 = unpack_strdup(e, &str, NULL);
498
499
500
501 if (!size2)
502 goto fail;
503 profile->file.trans.table[i] = str;
504
505 if (isspace(*str))
506 goto fail;
507
508
509 for (c = j = 0; j < size2 - 1; j++) {
510 if (!str[j]) {
511 pos = j;
512 c++;
513 }
514 }
515 if (*str == ':') {
516
517 if (!str[1])
518 goto fail;
519
520
521
522
523
524
525 if (c == 1)
526 str[pos] = ':';
527 else if (c > 1)
528 goto fail;
529 } else if (c)
530
531 goto fail;
532 }
533 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
534 goto fail;
535 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
536 goto fail;
537 }
538 return true;
539
540fail:
541 aa_free_domain_entries(&profile->file.trans);
542 e->pos = saved_pos;
543 return false;
544}
545
546static bool unpack_xattrs(struct aa_ext *e, struct aa_profile *profile)
547{
548 void *pos = e->pos;
549
550 if (unpack_nameX(e, AA_STRUCT, "xattrs")) {
551 int i, size;
552
553 size = unpack_array(e, NULL);
554 profile->xattr_count = size;
555 profile->xattrs = kcalloc(size, sizeof(char *), GFP_KERNEL);
556 if (!profile->xattrs)
557 goto fail;
558 for (i = 0; i < size; i++) {
559 if (!unpack_strdup(e, &profile->xattrs[i], NULL))
560 goto fail;
561 }
562 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
563 goto fail;
564 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
565 goto fail;
566 }
567
568 return true;
569
570fail:
571 e->pos = pos;
572 return false;
573}
574
575static bool unpack_secmark(struct aa_ext *e, struct aa_profile *profile)
576{
577 void *pos = e->pos;
578 int i, size;
579
580 if (unpack_nameX(e, AA_STRUCT, "secmark")) {
581 size = unpack_array(e, NULL);
582
583 profile->secmark = kcalloc(size, sizeof(struct aa_secmark),
584 GFP_KERNEL);
585 if (!profile->secmark)
586 goto fail;
587
588 profile->secmark_count = size;
589
590 for (i = 0; i < size; i++) {
591 if (!unpack_u8(e, &profile->secmark[i].audit, NULL))
592 goto fail;
593 if (!unpack_u8(e, &profile->secmark[i].deny, NULL))
594 goto fail;
595 if (!unpack_strdup(e, &profile->secmark[i].label, NULL))
596 goto fail;
597 }
598 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
599 goto fail;
600 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
601 goto fail;
602 }
603
604 return true;
605
606fail:
607 if (profile->secmark) {
608 for (i = 0; i < size; i++)
609 kfree(profile->secmark[i].label);
610 kfree(profile->secmark);
611 profile->secmark_count = 0;
612 profile->secmark = NULL;
613 }
614
615 e->pos = pos;
616 return false;
617}
618
619static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile)
620{
621 void *pos = e->pos;
622
623
624 if (unpack_nameX(e, AA_STRUCT, "rlimits")) {
625 int i, size;
626 u32 tmp = 0;
627 if (!unpack_u32(e, &tmp, NULL))
628 goto fail;
629 profile->rlimits.mask = tmp;
630
631 size = unpack_array(e, NULL);
632 if (size > RLIM_NLIMITS)
633 goto fail;
634 for (i = 0; i < size; i++) {
635 u64 tmp2 = 0;
636 int a = aa_map_resource(i);
637 if (!unpack_u64(e, &tmp2, NULL))
638 goto fail;
639 profile->rlimits.limits[a].rlim_max = tmp2;
640 }
641 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
642 goto fail;
643 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
644 goto fail;
645 }
646 return true;
647
648fail:
649 e->pos = pos;
650 return false;
651}
652
653static u32 strhash(const void *data, u32 len, u32 seed)
654{
655 const char * const *key = data;
656
657 return jhash(*key, strlen(*key), seed);
658}
659
660static int datacmp(struct rhashtable_compare_arg *arg, const void *obj)
661{
662 const struct aa_data *data = obj;
663 const char * const *key = arg->key;
664
665 return strcmp(data->key, *key);
666}
667
668
669
670
671
672
673
674static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
675{
676 struct aa_profile *profile = NULL;
677 const char *tmpname, *tmpns = NULL, *name = NULL;
678 const char *info = "failed to unpack profile";
679 size_t ns_len;
680 struct rhashtable_params params = { 0 };
681 char *key = NULL;
682 struct aa_data *data;
683 int i, error = -EPROTO;
684 kernel_cap_t tmpcap;
685 u32 tmp;
686
687 *ns_name = NULL;
688
689
690 if (!unpack_nameX(e, AA_STRUCT, "profile"))
691 goto fail;
692 if (!unpack_str(e, &name, NULL))
693 goto fail;
694 if (*name == '\0')
695 goto fail;
696
697 tmpname = aa_splitn_fqname(name, strlen(name), &tmpns, &ns_len);
698 if (tmpns) {
699 *ns_name = kstrndup(tmpns, ns_len, GFP_KERNEL);
700 if (!*ns_name) {
701 info = "out of memory";
702 goto fail;
703 }
704 name = tmpname;
705 }
706
707 profile = aa_alloc_profile(name, NULL, GFP_KERNEL);
708 if (!profile)
709 return ERR_PTR(-ENOMEM);
710
711
712 (void) unpack_str(e, &profile->rename, "rename");
713
714
715 (void) unpack_str(e, &profile->attach, "attach");
716
717
718 profile->xmatch = unpack_dfa(e);
719 if (IS_ERR(profile->xmatch)) {
720 error = PTR_ERR(profile->xmatch);
721 profile->xmatch = NULL;
722 info = "bad xmatch";
723 goto fail;
724 }
725
726 if (profile->xmatch) {
727 if (!unpack_u32(e, &tmp, NULL)) {
728 info = "missing xmatch len";
729 goto fail;
730 }
731 profile->xmatch_len = tmp;
732 }
733
734
735 (void) unpack_str(e, &profile->disconnected, "disconnected");
736
737
738 if (!unpack_nameX(e, AA_STRUCT, "flags")) {
739 info = "profile missing flags";
740 goto fail;
741 }
742 info = "failed to unpack profile flags";
743 if (!unpack_u32(e, &tmp, NULL))
744 goto fail;
745 if (tmp & PACKED_FLAG_HAT)
746 profile->label.flags |= FLAG_HAT;
747 if (!unpack_u32(e, &tmp, NULL))
748 goto fail;
749 if (tmp == PACKED_MODE_COMPLAIN || (e->version & FORCE_COMPLAIN_FLAG))
750 profile->mode = APPARMOR_COMPLAIN;
751 else if (tmp == PACKED_MODE_ENFORCE)
752 profile->mode = APPARMOR_ENFORCE;
753 else if (tmp == PACKED_MODE_KILL)
754 profile->mode = APPARMOR_KILL;
755 else if (tmp == PACKED_MODE_UNCONFINED)
756 profile->mode = APPARMOR_UNCONFINED;
757 else
758 goto fail;
759 if (!unpack_u32(e, &tmp, NULL))
760 goto fail;
761 if (tmp)
762 profile->audit = AUDIT_ALL;
763
764 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
765 goto fail;
766
767
768 if (unpack_u32(e, &profile->path_flags, "path_flags"))
769 profile->path_flags |= profile->label.flags &
770 PATH_MEDIATE_DELETED;
771 else
772
773 profile->path_flags = PATH_MEDIATE_DELETED;
774
775 info = "failed to unpack profile capabilities";
776 if (!unpack_u32(e, &(profile->caps.allow.cap[0]), NULL))
777 goto fail;
778 if (!unpack_u32(e, &(profile->caps.audit.cap[0]), NULL))
779 goto fail;
780 if (!unpack_u32(e, &(profile->caps.quiet.cap[0]), NULL))
781 goto fail;
782 if (!unpack_u32(e, &tmpcap.cap[0], NULL))
783 goto fail;
784
785 info = "failed to unpack upper profile capabilities";
786 if (unpack_nameX(e, AA_STRUCT, "caps64")) {
787
788 if (!unpack_u32(e, &(profile->caps.allow.cap[1]), NULL))
789 goto fail;
790 if (!unpack_u32(e, &(profile->caps.audit.cap[1]), NULL))
791 goto fail;
792 if (!unpack_u32(e, &(profile->caps.quiet.cap[1]), NULL))
793 goto fail;
794 if (!unpack_u32(e, &(tmpcap.cap[1]), NULL))
795 goto fail;
796 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
797 goto fail;
798 }
799
800 info = "failed to unpack extended profile capabilities";
801 if (unpack_nameX(e, AA_STRUCT, "capsx")) {
802
803 if (!unpack_u32(e, &(profile->caps.extended.cap[0]), NULL))
804 goto fail;
805 if (!unpack_u32(e, &(profile->caps.extended.cap[1]), NULL))
806 goto fail;
807 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
808 goto fail;
809 }
810
811 if (!unpack_xattrs(e, profile)) {
812 info = "failed to unpack profile xattrs";
813 goto fail;
814 }
815
816 if (!unpack_rlimits(e, profile)) {
817 info = "failed to unpack profile rlimits";
818 goto fail;
819 }
820
821 if (!unpack_secmark(e, profile)) {
822 info = "failed to unpack profile secmark rules";
823 goto fail;
824 }
825
826 if (unpack_nameX(e, AA_STRUCT, "policydb")) {
827
828 info = "failed to unpack policydb";
829 profile->policy.dfa = unpack_dfa(e);
830 if (IS_ERR(profile->policy.dfa)) {
831 error = PTR_ERR(profile->policy.dfa);
832 profile->policy.dfa = NULL;
833 goto fail;
834 } else if (!profile->policy.dfa) {
835 error = -EPROTO;
836 goto fail;
837 }
838 if (!unpack_u32(e, &profile->policy.start[0], "start"))
839
840 profile->policy.start[0] = DFA_START;
841
842 for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) {
843 profile->policy.start[i] =
844 aa_dfa_next(profile->policy.dfa,
845 profile->policy.start[0],
846 i);
847 }
848 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
849 goto fail;
850 } else
851 profile->policy.dfa = aa_get_dfa(nulldfa);
852
853
854 profile->file.dfa = unpack_dfa(e);
855 if (IS_ERR(profile->file.dfa)) {
856 error = PTR_ERR(profile->file.dfa);
857 profile->file.dfa = NULL;
858 info = "failed to unpack profile file rules";
859 goto fail;
860 } else if (profile->file.dfa) {
861 if (!unpack_u32(e, &profile->file.start, "dfa_start"))
862
863 profile->file.start = DFA_START;
864 } else if (profile->policy.dfa &&
865 profile->policy.start[AA_CLASS_FILE]) {
866 profile->file.dfa = aa_get_dfa(profile->policy.dfa);
867 profile->file.start = profile->policy.start[AA_CLASS_FILE];
868 } else
869 profile->file.dfa = aa_get_dfa(nulldfa);
870
871 if (!unpack_trans_table(e, profile)) {
872 info = "failed to unpack profile transition table";
873 goto fail;
874 }
875
876 if (unpack_nameX(e, AA_STRUCT, "data")) {
877 info = "out of memory";
878 profile->data = kzalloc(sizeof(*profile->data), GFP_KERNEL);
879 if (!profile->data)
880 goto fail;
881
882 params.nelem_hint = 3;
883 params.key_len = sizeof(void *);
884 params.key_offset = offsetof(struct aa_data, key);
885 params.head_offset = offsetof(struct aa_data, head);
886 params.hashfn = strhash;
887 params.obj_cmpfn = datacmp;
888
889 if (rhashtable_init(profile->data, ¶ms)) {
890 info = "failed to init key, value hash table";
891 goto fail;
892 }
893
894 while (unpack_strdup(e, &key, NULL)) {
895 data = kzalloc(sizeof(*data), GFP_KERNEL);
896 if (!data) {
897 kfree_sensitive(key);
898 goto fail;
899 }
900
901 data->key = key;
902 data->size = unpack_blob(e, &data->data, NULL);
903 data->data = kvmemdup(data->data, data->size);
904 if (data->size && !data->data) {
905 kfree_sensitive(data->key);
906 kfree_sensitive(data);
907 goto fail;
908 }
909
910 rhashtable_insert_fast(profile->data, &data->head,
911 profile->data->p);
912 }
913
914 if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
915 info = "failed to unpack end of key, value data table";
916 goto fail;
917 }
918 }
919
920 if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
921 info = "failed to unpack end of profile";
922 goto fail;
923 }
924
925 return profile;
926
927fail:
928 if (profile)
929 name = NULL;
930 else if (!name)
931 name = "unknown";
932 audit_iface(profile, NULL, name, info, e, error);
933 aa_free_profile(profile);
934
935 return ERR_PTR(error);
936}
937
938
939
940
941
942
943
944
945
946static int verify_header(struct aa_ext *e, int required, const char **ns)
947{
948 int error = -EPROTONOSUPPORT;
949 const char *name = NULL;
950 *ns = NULL;
951
952
953 if (!unpack_u32(e, &e->version, "version")) {
954 if (required) {
955 audit_iface(NULL, NULL, NULL, "invalid profile format",
956 e, error);
957 return error;
958 }
959 }
960
961
962
963
964
965 if (VERSION_LT(e->version, v5) || VERSION_GT(e->version, v7)) {
966 audit_iface(NULL, NULL, NULL, "unsupported interface version",
967 e, error);
968 return error;
969 }
970
971
972 if (unpack_str(e, &name, "namespace")) {
973 if (*name == '\0') {
974 audit_iface(NULL, NULL, NULL, "invalid namespace name",
975 e, error);
976 return error;
977 }
978 if (*ns && strcmp(*ns, name)) {
979 audit_iface(NULL, NULL, NULL, "invalid ns change", e,
980 error);
981 } else if (!*ns) {
982 *ns = kstrdup(name, GFP_KERNEL);
983 if (!*ns)
984 return -ENOMEM;
985 }
986 }
987
988 return 0;
989}
990
991static bool verify_xindex(int xindex, int table_size)
992{
993 int index, xtype;
994 xtype = xindex & AA_X_TYPE_MASK;
995 index = xindex & AA_X_INDEX_MASK;
996 if (xtype == AA_X_TABLE && index >= table_size)
997 return false;
998 return true;
999}
1000
1001
1002static bool verify_dfa_xindex(struct aa_dfa *dfa, int table_size)
1003{
1004 int i;
1005 for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
1006 if (!verify_xindex(dfa_user_xindex(dfa, i), table_size))
1007 return false;
1008 if (!verify_xindex(dfa_other_xindex(dfa, i), table_size))
1009 return false;
1010 }
1011 return true;
1012}
1013
1014
1015
1016
1017
1018
1019
1020static int verify_profile(struct aa_profile *profile)
1021{
1022 if (profile->file.dfa &&
1023 !verify_dfa_xindex(profile->file.dfa,
1024 profile->file.trans.size)) {
1025 audit_iface(profile, NULL, NULL, "Invalid named transition",
1026 NULL, -EPROTO);
1027 return -EPROTO;
1028 }
1029
1030 return 0;
1031}
1032
1033void aa_load_ent_free(struct aa_load_ent *ent)
1034{
1035 if (ent) {
1036 aa_put_profile(ent->rename);
1037 aa_put_profile(ent->old);
1038 aa_put_profile(ent->new);
1039 kfree(ent->ns_name);
1040 kfree_sensitive(ent);
1041 }
1042}
1043
1044struct aa_load_ent *aa_load_ent_alloc(void)
1045{
1046 struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
1047 if (ent)
1048 INIT_LIST_HEAD(&ent->list);
1049 return ent;
1050}
1051
1052static int deflate_compress(const char *src, size_t slen, char **dst,
1053 size_t *dlen)
1054{
1055 int error;
1056 struct z_stream_s strm;
1057 void *stgbuf, *dstbuf;
1058 size_t stglen = deflateBound(slen);
1059
1060 memset(&strm, 0, sizeof(strm));
1061
1062 if (stglen < slen)
1063 return -EFBIG;
1064
1065 strm.workspace = kvzalloc(zlib_deflate_workspacesize(MAX_WBITS,
1066 MAX_MEM_LEVEL),
1067 GFP_KERNEL);
1068 if (!strm.workspace)
1069 return -ENOMEM;
1070
1071 error = zlib_deflateInit(&strm, aa_g_rawdata_compression_level);
1072 if (error != Z_OK) {
1073 error = -ENOMEM;
1074 goto fail_deflate_init;
1075 }
1076
1077 stgbuf = kvzalloc(stglen, GFP_KERNEL);
1078 if (!stgbuf) {
1079 error = -ENOMEM;
1080 goto fail_stg_alloc;
1081 }
1082
1083 strm.next_in = src;
1084 strm.avail_in = slen;
1085 strm.next_out = stgbuf;
1086 strm.avail_out = stglen;
1087
1088 error = zlib_deflate(&strm, Z_FINISH);
1089 if (error != Z_STREAM_END) {
1090 error = -EINVAL;
1091 goto fail_deflate;
1092 }
1093 error = 0;
1094
1095 if (is_vmalloc_addr(stgbuf)) {
1096 dstbuf = kvzalloc(strm.total_out, GFP_KERNEL);
1097 if (dstbuf) {
1098 memcpy(dstbuf, stgbuf, strm.total_out);
1099 kvfree(stgbuf);
1100 }
1101 } else
1102
1103
1104
1105
1106
1107 dstbuf = krealloc(stgbuf, strm.total_out, GFP_KERNEL);
1108
1109 if (!dstbuf) {
1110 error = -ENOMEM;
1111 goto fail_deflate;
1112 }
1113
1114 *dst = dstbuf;
1115 *dlen = strm.total_out;
1116
1117fail_stg_alloc:
1118 zlib_deflateEnd(&strm);
1119fail_deflate_init:
1120 kvfree(strm.workspace);
1121 return error;
1122
1123fail_deflate:
1124 kvfree(stgbuf);
1125 goto fail_stg_alloc;
1126}
1127
1128static int compress_loaddata(struct aa_loaddata *data)
1129{
1130
1131 AA_BUG(data->compressed_size > 0);
1132
1133
1134
1135
1136
1137 if (aa_g_rawdata_compression_level != 0) {
1138 void *udata = data->data;
1139 int error = deflate_compress(udata, data->size, &data->data,
1140 &data->compressed_size);
1141 if (error)
1142 return error;
1143
1144 kvfree(udata);
1145 } else
1146 data->compressed_size = data->size;
1147
1148 return 0;
1149}
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163int aa_unpack(struct aa_loaddata *udata, struct list_head *lh,
1164 const char **ns)
1165{
1166 struct aa_load_ent *tmp, *ent;
1167 struct aa_profile *profile = NULL;
1168 int error;
1169 struct aa_ext e = {
1170 .start = udata->data,
1171 .end = udata->data + udata->size,
1172 .pos = udata->data,
1173 };
1174
1175 *ns = NULL;
1176 while (e.pos < e.end) {
1177 char *ns_name = NULL;
1178 void *start;
1179 error = verify_header(&e, e.pos == e.start, ns);
1180 if (error)
1181 goto fail;
1182
1183 start = e.pos;
1184 profile = unpack_profile(&e, &ns_name);
1185 if (IS_ERR(profile)) {
1186 error = PTR_ERR(profile);
1187 goto fail;
1188 }
1189
1190 error = verify_profile(profile);
1191 if (error)
1192 goto fail_profile;
1193
1194 if (aa_g_hash_policy)
1195 error = aa_calc_profile_hash(profile, e.version, start,
1196 e.pos - start);
1197 if (error)
1198 goto fail_profile;
1199
1200 ent = aa_load_ent_alloc();
1201 if (!ent) {
1202 error = -ENOMEM;
1203 goto fail_profile;
1204 }
1205
1206 ent->new = profile;
1207 ent->ns_name = ns_name;
1208 list_add_tail(&ent->list, lh);
1209 }
1210 udata->abi = e.version & K_ABI_MASK;
1211 if (aa_g_hash_policy) {
1212 udata->hash = aa_calc_hash(udata->data, udata->size);
1213 if (IS_ERR(udata->hash)) {
1214 error = PTR_ERR(udata->hash);
1215 udata->hash = NULL;
1216 goto fail;
1217 }
1218 }
1219 error = compress_loaddata(udata);
1220 if (error)
1221 goto fail;
1222 return 0;
1223
1224fail_profile:
1225 aa_put_profile(profile);
1226
1227fail:
1228 list_for_each_entry_safe(ent, tmp, lh, list) {
1229 list_del_init(&ent->list);
1230 aa_load_ent_free(ent);
1231 }
1232
1233 return error;
1234}
1235
1236#ifdef CONFIG_SECURITY_APPARMOR_KUNIT_TEST
1237#include "policy_unpack_test.c"
1238#endif
1239