security/apparmor/policy_unpack.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * AppArmor security module
   4  *
   5  * This file contains AppArmor functions for unpacking policy loaded from
   6  * userspace.
   7  *
   8  * Copyright (C) 1998-2008 Novell/SUSE
   9  * Copyright 2009-2010 Canonical Ltd.
  10  *
  11  * AppArmor uses a serialized binary format for loading policy. To find
  12  * policy format documentation see Documentation/admin-guide/LSM/apparmor.rst
  13  * All policy is validated before it is used.
  14  */
  15
  16 #include <asm/unaligned.h>
  17 #include <kunit/visibility.h>
  18 #include <linux/ctype.h>
  19 #include <linux/errno.h>
  20 #include <linux/zstd.h>
  21
  22 #include "include/apparmor.h"
  23 #include "include/audit.h"
  24 #include "include/cred.h"
  25 #include "include/crypto.h"
  26 #include "include/file.h"
  27 #include "include/match.h"
  28 #include "include/path.h"
  29 #include "include/policy.h"
  30 #include "include/policy_unpack.h"
  31 #include "include/policy_compat.h"
  32
  33 /* audit callback for unpack fields */
  34 static void audit_cb(struct audit_buffer *ab, void *va)
  35 {
  36         struct common_audit_data *sa = va;
  37         struct apparmor_audit_data *ad = aad(sa);
  38
  39         if (ad->iface.ns) {
  40                 audit_log_format(ab, " ns=");
  41                 audit_log_untrustedstring(ab, ad->iface.ns);
  42         }
  43         if (ad->name) {
  44                 audit_log_format(ab, " name=");
  45                 audit_log_untrustedstring(ab, ad->name);
  46         }
  47         if (ad->iface.pos)
  48                 audit_log_format(ab, " offset=%ld", ad->iface.pos);
  49 }
  50
  51 /**
  52  * audit_iface - do audit message for policy unpacking/load/replace/remove
  53  * @new: profile if it has been allocated (MAYBE NULL)
  54  * @ns_name: name of the ns the profile is to be loaded to (MAY BE NULL)
  55  * @name: name of the profile being manipulated (MAYBE NULL)
  56  * @info: any extra info about the failure (MAYBE NULL)
  57  * @e: buffer position info
  58  * @error: error code
  59  *
  60  * Returns: %0 or error
  61  */
  62 static int audit_iface(struct aa_profile *new, const char *ns_name,
  63                        const char *name, const char *info, struct aa_ext *e,
  64                        int error)
  65 {
  66         struct aa_profile *profile = labels_profile(aa_current_raw_label());
  67         DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_NONE, NULL);
  68         if (e)
  69                 ad.iface.pos = e->pos - e->start;
  70         ad.iface.ns = ns_name;
  71         if (new)
  72                 ad.name = new->base.hname;
  73         else
  74                 ad.name = name;
  75         ad.info = info;
  76         ad.error = error;
  77
  78         return aa_audit(AUDIT_APPARMOR_STATUS, profile, &ad, audit_cb);
  79 }
  80
  81 void __aa_loaddata_update(struct aa_loaddata *data, long revision)
  82 {
  83         AA_BUG(!data);
  84         AA_BUG(!data->ns);
  85         AA_BUG(!mutex_is_locked(&data->ns->lock));
  86         AA_BUG(data->revision > revision);
  87
  88         data->revision = revision;
  89         if ((data->dents[AAFS_LOADDATA_REVISION])) {
  90                 struct inode *inode;
  91
  92                 inode = d_inode(data->dents[AAFS_LOADDATA_DIR]);
  93                 inode->i_mtime = inode_set_ctime_current(inode);
  94
  95                 inode = d_inode(data->dents[AAFS_LOADDATA_REVISION]);
  96                 inode->i_mtime = inode_set_ctime_current(inode);
  97         }
  98 }
  99
 100 bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r)
 101 {
 102         if (l->size != r->size)
 103                 return false;
 104         if (l->compressed_size != r->compressed_size)
 105                 return false;
 106         if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0)
 107                 return false;
 108         return memcmp(l->data, r->data, r->compressed_size ?: r->size) == 0;
 109 }
 110
 111 /*
 112  * need to take the ns mutex lock which is NOT safe most places that
 113  * put_loaddata is called, so we have to delay freeing it
 114  */
 115 static void do_loaddata_free(struct work_struct *work)
 116 {
 117         struct aa_loaddata *d = container_of(work, struct aa_loaddata, work);
 118         struct aa_ns *ns = aa_get_ns(d->ns);
 119
 120         if (ns) {
 121                 mutex_lock_nested(&ns->lock, ns->level);
 122                 __aa_fs_remove_rawdata(d);
 123                 mutex_unlock(&ns->lock);
 124                 aa_put_ns(ns);
 125         }
 126
 127         kfree_sensitive(d->hash);
 128         kfree_sensitive(d->name);
 129         kvfree(d->data);
 130         kfree_sensitive(d);
 131 }
 132
 133 void aa_loaddata_kref(struct kref *kref)
 134 {
 135         struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count);
 136
 137         if (d) {
 138                 INIT_WORK(&d->work, do_loaddata_free);
 139                 schedule_work(&d->work);
 140         }
 141 }
 142
 143 struct aa_loaddata *aa_loaddata_alloc(size_t size)
 144 {
 145         struct aa_loaddata *d;
 146
 147         d = kzalloc(sizeof(*d), GFP_KERNEL);
 148         if (d == NULL)
 149                 return ERR_PTR(-ENOMEM);
 150         d->data = kvzalloc(size, GFP_KERNEL);
 151         if (!d->data) {
 152                 kfree(d);
 153                 return ERR_PTR(-ENOMEM);
 154         }
 155         kref_init(&d->count);
 156         INIT_LIST_HEAD(&d->list);
 157
 158         return d;
 159 }
 160
 161 /* test if read will be in packed data bounds */
 162 VISIBLE_IF_KUNIT bool aa_inbounds(struct aa_ext *e, size_t size)
 163 {
 164         return (size <= e->end - e->pos);
 165 }
 166 EXPORT_SYMBOL_IF_KUNIT(aa_inbounds);
 167
 168 /**
 169  * aa_unpack_u16_chunk - test and do bounds checking for a u16 size based chunk
 170  * @e: serialized data read head (NOT NULL)
 171  * @chunk: start address for chunk of data (NOT NULL)
 172  *
 173  * Returns: the size of chunk found with the read head at the end of the chunk.
 174  */
 175 VISIBLE_IF_KUNIT size_t aa_unpack_u16_chunk(struct aa_ext *e, char **chunk)
 176 {
 177         size_t size = 0;
 178         void *pos = e->pos;
 179
 180         if (!aa_inbounds(e, sizeof(u16)))
 181                 goto fail;
 182         size = le16_to_cpu(get_unaligned((__le16 *) e->pos));
 183         e->pos += sizeof(__le16);
 184         if (!aa_inbounds(e, size))
 185                 goto fail;
 186         *chunk = e->pos;
 187         e->pos += size;
 188         return size;
 189
 190 fail:
 191         e->pos = pos;
 192         return 0;
 193 }
 194 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_u16_chunk);
 195
 196 /* unpack control byte */
 197 VISIBLE_IF_KUNIT bool aa_unpack_X(struct aa_ext *e, enum aa_code code)
 198 {
 199         if (!aa_inbounds(e, 1))
 200                 return false;
 201         if (*(u8 *) e->pos != code)
 202                 return false;
 203         e->pos++;
 204         return true;
 205 }
 206 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_X);
 207
 208 /**
 209  * aa_unpack_nameX - check is the next element is of type X with a name of @name
 210  * @e: serialized data extent information  (NOT NULL)
 211  * @code: type code
 212  * @name: name to match to the serialized element.  (MAYBE NULL)
 213  *
 214  * check that the next serialized data element is of type X and has a tag
 215  * name @name.  If @name is specified then there must be a matching
 216  * name element in the stream.  If @name is NULL any name element will be
 217  * skipped and only the typecode will be tested.
 218  *
 219  * Returns true on success (both type code and name tests match) and the read
 220  * head is advanced past the headers
 221  *
 222  * Returns: false if either match fails, the read head does not move
 223  */
 224 VISIBLE_IF_KUNIT bool aa_unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
 225 {
 226         /*
 227          * May need to reset pos if name or type doesn't match
 228          */
 229         void *pos = e->pos;
 230         /*
 231          * Check for presence of a tagname, and if present name size
 232          * AA_NAME tag value is a u16.
 233          */
 234         if (aa_unpack_X(e, AA_NAME)) {
 235                 char *tag = NULL;
 236                 size_t size = aa_unpack_u16_chunk(e, &tag);
 237                 /* if a name is specified it must match. otherwise skip tag */
 238                 if (name && (!size || tag[size-1] != '\0' || strcmp(name, tag)))
 239                         goto fail;
 240         } else if (name) {
 241                 /* if a name is specified and there is no name tag fail */
 242                 goto fail;
 243         }
 244
 245         /* now check if type code matches */
 246         if (aa_unpack_X(e, code))
 247                 return true;
 248
 249 fail:
 250         e->pos = pos;
 251         return false;
 252 }
 253 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_nameX);
 254
 255 static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name)
 256 {
 257         void *pos = e->pos;
 258
 259         if (aa_unpack_nameX(e, AA_U8, name)) {
 260                 if (!aa_inbounds(e, sizeof(u8)))
 261                         goto fail;
 262                 if (data)
 263                         *data = *((u8 *)e->pos);
 264                 e->pos += sizeof(u8);
 265                 return true;
 266         }
 267
 268 fail:
 269         e->pos = pos;
 270         return false;
 271 }
 272
 273 VISIBLE_IF_KUNIT bool aa_unpack_u32(struct aa_ext *e, u32 *data, const char *name)
 274 {
 275         void *pos = e->pos;
 276
 277         if (aa_unpack_nameX(e, AA_U32, name)) {
 278                 if (!aa_inbounds(e, sizeof(u32)))
 279                         goto fail;
 280                 if (data)
 281                         *data = le32_to_cpu(get_unaligned((__le32 *) e->pos));
 282                 e->pos += sizeof(u32);
 283                 return true;
 284         }
 285
 286 fail:
 287         e->pos = pos;
 288         return false;
 289 }
 290 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_u32);
 291
 292 VISIBLE_IF_KUNIT bool aa_unpack_u64(struct aa_ext *e, u64 *data, const char *name)
 293 {
 294         void *pos = e->pos;
 295
 296         if (aa_unpack_nameX(e, AA_U64, name)) {
 297                 if (!aa_inbounds(e, sizeof(u64)))
 298                         goto fail;
 299                 if (data)
 300                         *data = le64_to_cpu(get_unaligned((__le64 *) e->pos));
 301                 e->pos += sizeof(u64);
 302                 return true;
 303         }
 304
 305 fail:
 306         e->pos = pos;
 307         return false;
 308 }
 309 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_u64);
 310
 311 static bool aa_unpack_cap_low(struct aa_ext *e, kernel_cap_t *data, const char *name)
 312 {
 313         u32 val;
 314
 315         if (!aa_unpack_u32(e, &val, name))
 316                 return false;
 317         data->val = val;
 318         return true;
 319 }
 320
 321 static bool aa_unpack_cap_high(struct aa_ext *e, kernel_cap_t *data, const char *name)
 322 {
 323         u32 val;
 324
 325         if (!aa_unpack_u32(e, &val, name))
 326                 return false;
 327         data->val = (u32)data->val | ((u64)val << 32);
 328         return true;
 329 }
 330
 331 VISIBLE_IF_KUNIT bool aa_unpack_array(struct aa_ext *e, const char *name, u16 *size)
 332 {
 333         void *pos = e->pos;
 334
 335         if (aa_unpack_nameX(e, AA_ARRAY, name)) {
 336                 if (!aa_inbounds(e, sizeof(u16)))
 337                         goto fail;
 338                 *size = le16_to_cpu(get_unaligned((__le16 *) e->pos));
 339                 e->pos += sizeof(u16);
 340                 return true;
 341         }
 342
 343 fail:
 344         e->pos = pos;
 345         return false;
 346 }
 347 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_array);
 348
 349 VISIBLE_IF_KUNIT size_t aa_unpack_blob(struct aa_ext *e, char **blob, const char *name)
 350 {
 351         void *pos = e->pos;
 352
 353         if (aa_unpack_nameX(e, AA_BLOB, name)) {
 354                 u32 size;
 355                 if (!aa_inbounds(e, sizeof(u32)))
 356                         goto fail;
 357                 size = le32_to_cpu(get_unaligned((__le32 *) e->pos));
 358                 e->pos += sizeof(u32);
 359                 if (aa_inbounds(e, (size_t) size)) {
 360                         *blob = e->pos;
 361                         e->pos += size;
 362                         return size;
 363                 }
 364         }
 365
 366 fail:
 367         e->pos = pos;
 368         return 0;
 369 }
 370 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_blob);
 371
 372 VISIBLE_IF_KUNIT int aa_unpack_str(struct aa_ext *e, const char **string, const char *name)
 373 {
 374         char *src_str;
 375         size_t size = 0;
 376         void *pos = e->pos;
 377         *string = NULL;
 378         if (aa_unpack_nameX(e, AA_STRING, name)) {
 379                 size = aa_unpack_u16_chunk(e, &src_str);
 380                 if (size) {
 381                         /* strings are null terminated, length is size - 1 */
 382                         if (src_str[size - 1] != 0)
 383                                 goto fail;
 384                         *string = src_str;
 385
 386                         return size;
 387                 }
 388         }
 389
 390 fail:
 391         e->pos = pos;
 392         return 0;
 393 }
 394 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_str);
 395
 396 VISIBLE_IF_KUNIT int aa_unpack_strdup(struct aa_ext *e, char **string, const char *name)
 397 {
 398         const char *tmp;
 399         void *pos = e->pos;
 400         int res = aa_unpack_str(e, &tmp, name);
 401         *string = NULL;
 402
 403         if (!res)
 404                 return 0;
 405
 406         *string = kmemdup(tmp, res, GFP_KERNEL);
 407         if (!*string) {
 408                 e->pos = pos;
 409                 return 0;
 410         }
 411
 412         return res;
 413 }
 414 EXPORT_SYMBOL_IF_KUNIT(aa_unpack_strdup);
 415
 416
 417 /**
 418  * unpack_dfa - unpack a file rule dfa
 419  * @e: serialized data extent information (NOT NULL)
 420  * @flags: dfa flags to check
 421  *
 422  * returns dfa or ERR_PTR or NULL if no dfa
 423  */
 424 static struct aa_dfa *unpack_dfa(struct aa_ext *e, int flags)
 425 {
 426         char *blob = NULL;
 427         size_t size;
 428         struct aa_dfa *dfa = NULL;
 429
 430         size = aa_unpack_blob(e, &blob, "aadfa");
 431         if (size) {
 432                 /*
 433                  * The dfa is aligned with in the blob to 8 bytes
 434                  * from the beginning of the stream.
 435                  * alignment adjust needed by dfa unpack
 436                  */
 437                 size_t sz = blob - (char *) e->start -
 438                         ((e->pos - e->start) & 7);
 439                 size_t pad = ALIGN(sz, 8) - sz;
 440                 if (aa_g_paranoid_load)
 441                         flags |= DFA_FLAG_VERIFY_STATES;
 442                 dfa = aa_dfa_unpack(blob + pad, size - pad, flags);
 443
 444                 if (IS_ERR(dfa))
 445                         return dfa;
 446
 447         }
 448
 449         return dfa;
 450 }
 451
 452 /**
 453  * unpack_trans_table - unpack a profile transition table
 454  * @e: serialized data extent information  (NOT NULL)
 455  * @strs: str table to unpack to (NOT NULL)
 456  *
 457  * Returns: true if table successfully unpacked or not present
 458  */
 459 static bool unpack_trans_table(struct aa_ext *e, struct aa_str_table *strs)
 460 {
 461         void *saved_pos = e->pos;
 462         char **table = NULL;
 463
 464         /* exec table is optional */
 465         if (aa_unpack_nameX(e, AA_STRUCT, "xtable")) {
 466                 u16 size;
 467                 int i;
 468
 469                 if (!aa_unpack_array(e, NULL, &size))
 470                         /*
 471                          * Note: index into trans table array is a max
 472                          * of 2^24, but unpack array can only unpack
 473                          * an array of 2^16 in size atm so no need
 474                          * for size check here
 475                          */
 476                         goto fail;
 477                 table = kcalloc(size, sizeof(char *), GFP_KERNEL);
 478                 if (!table)
 479                         goto fail;
 480
 481                 strs->table = table;
 482                 strs->size = size;
 483                 for (i = 0; i < size; i++) {
 484                         char *str;
 485                         int c, j, pos, size2 = aa_unpack_strdup(e, &str, NULL);
 486                         /* aa_unpack_strdup verifies that the last character is
 487                          * null termination byte.
 488                          */
 489                         if (!size2)
 490                                 goto fail;
 491                         table[i] = str;
 492                         /* verify that name doesn't start with space */
 493                         if (isspace(*str))
 494                                 goto fail;
 495
 496                         /* count internal #  of internal \0 */
 497                         for (c = j = 0; j < size2 - 1; j++) {
 498                                 if (!str[j]) {
 499                                         pos = j;
 500                                         c++;
 501                                 }
 502                         }
 503                         if (*str == ':') {
 504                                 /* first character after : must be valid */
 505                                 if (!str[1])
 506                                         goto fail;
 507                                 /* beginning with : requires an embedded \0,
 508                                  * verify that exactly 1 internal \0 exists
 509                                  * trailing \0 already verified by aa_unpack_strdup
 510                                  *
 511                                  * convert \0 back to : for label_parse
 512                                  */
 513                                 if (c == 1)
 514                                         str[pos] = ':';
 515                                 else if (c > 1)
 516                                         goto fail;
 517                         } else if (c)
 518                                 /* fail - all other cases with embedded \0 */
 519                                 goto fail;
 520                 }
 521                 if (!aa_unpack_nameX(e, AA_ARRAYEND, NULL))
 522                         goto fail;
 523                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 524                         goto fail;
 525         }
 526         return true;
 527
 528 fail:
 529         aa_free_str_table(strs);
 530         e->pos = saved_pos;
 531         return false;
 532 }
 533
 534 static bool unpack_xattrs(struct aa_ext *e, struct aa_profile *profile)
 535 {
 536         void *pos = e->pos;
 537
 538         if (aa_unpack_nameX(e, AA_STRUCT, "xattrs")) {
 539                 u16 size;
 540                 int i;
 541
 542                 if (!aa_unpack_array(e, NULL, &size))
 543                         goto fail;
 544                 profile->attach.xattr_count = size;
 545                 profile->attach.xattrs = kcalloc(size, sizeof(char *), GFP_KERNEL);
 546                 if (!profile->attach.xattrs)
 547                         goto fail;
 548                 for (i = 0; i < size; i++) {
 549                         if (!aa_unpack_strdup(e, &profile->attach.xattrs[i], NULL))
 550                                 goto fail;
 551                 }
 552                 if (!aa_unpack_nameX(e, AA_ARRAYEND, NULL))
 553                         goto fail;
 554                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 555                         goto fail;
 556         }
 557
 558         return true;
 559
 560 fail:
 561         e->pos = pos;
 562         return false;
 563 }
 564
 565 static bool unpack_secmark(struct aa_ext *e, struct aa_ruleset *rules)
 566 {
 567         void *pos = e->pos;
 568         u16 size;
 569         int i;
 570
 571         if (aa_unpack_nameX(e, AA_STRUCT, "secmark")) {
 572                 if (!aa_unpack_array(e, NULL, &size))
 573                         goto fail;
 574
 575                 rules->secmark = kcalloc(size, sizeof(struct aa_secmark),
 576                                            GFP_KERNEL);
 577                 if (!rules->secmark)
 578                         goto fail;
 579
 580                 rules->secmark_count = size;
 581
 582                 for (i = 0; i < size; i++) {
 583                         if (!unpack_u8(e, &rules->secmark[i].audit, NULL))
 584                                 goto fail;
 585                         if (!unpack_u8(e, &rules->secmark[i].deny, NULL))
 586                                 goto fail;
 587                         if (!aa_unpack_strdup(e, &rules->secmark[i].label, NULL))
 588                                 goto fail;
 589                 }
 590                 if (!aa_unpack_nameX(e, AA_ARRAYEND, NULL))
 591                         goto fail;
 592                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 593                         goto fail;
 594         }
 595
 596         return true;
 597
 598 fail:
 599         if (rules->secmark) {
 600                 for (i = 0; i < size; i++)
 601                         kfree(rules->secmark[i].label);
 602                 kfree(rules->secmark);
 603                 rules->secmark_count = 0;
 604                 rules->secmark = NULL;
 605         }
 606
 607         e->pos = pos;
 608         return false;
 609 }
 610
 611 static bool unpack_rlimits(struct aa_ext *e, struct aa_ruleset *rules)
 612 {
 613         void *pos = e->pos;
 614
 615         /* rlimits are optional */
 616         if (aa_unpack_nameX(e, AA_STRUCT, "rlimits")) {
 617                 u16 size;
 618                 int i;
 619                 u32 tmp = 0;
 620                 if (!aa_unpack_u32(e, &tmp, NULL))
 621                         goto fail;
 622                 rules->rlimits.mask = tmp;
 623
 624                 if (!aa_unpack_array(e, NULL, &size) ||
 625                     size > RLIM_NLIMITS)
 626                         goto fail;
 627                 for (i = 0; i < size; i++) {
 628                         u64 tmp2 = 0;
 629                         int a = aa_map_resource(i);
 630                         if (!aa_unpack_u64(e, &tmp2, NULL))
 631                                 goto fail;
 632                         rules->rlimits.limits[a].rlim_max = tmp2;
 633                 }
 634                 if (!aa_unpack_nameX(e, AA_ARRAYEND, NULL))
 635                         goto fail;
 636                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 637                         goto fail;
 638         }
 639         return true;
 640
 641 fail:
 642         e->pos = pos;
 643         return false;
 644 }
 645
 646 static bool unpack_perm(struct aa_ext *e, u32 version, struct aa_perms *perm)
 647 {
 648         if (version != 1)
 649                 return false;
 650
 651         return  aa_unpack_u32(e, &perm->allow, NULL) &&
 652                 aa_unpack_u32(e, &perm->allow, NULL) &&
 653                 aa_unpack_u32(e, &perm->deny, NULL) &&
 654                 aa_unpack_u32(e, &perm->subtree, NULL) &&
 655                 aa_unpack_u32(e, &perm->cond, NULL) &&
 656                 aa_unpack_u32(e, &perm->kill, NULL) &&
 657                 aa_unpack_u32(e, &perm->complain, NULL) &&
 658                 aa_unpack_u32(e, &perm->prompt, NULL) &&
 659                 aa_unpack_u32(e, &perm->audit, NULL) &&
 660                 aa_unpack_u32(e, &perm->quiet, NULL) &&
 661                 aa_unpack_u32(e, &perm->hide, NULL) &&
 662                 aa_unpack_u32(e, &perm->xindex, NULL) &&
 663                 aa_unpack_u32(e, &perm->tag, NULL) &&
 664                 aa_unpack_u32(e, &perm->label, NULL);
 665 }
 666
 667 static ssize_t unpack_perms_table(struct aa_ext *e, struct aa_perms **perms)
 668 {
 669         void *pos = e->pos;
 670         u16 size = 0;
 671
 672         AA_BUG(!perms);
 673         /*
 674          * policy perms are optional, in which case perms are embedded
 675          * in the dfa accept table
 676          */
 677         if (aa_unpack_nameX(e, AA_STRUCT, "perms")) {
 678                 int i;
 679                 u32 version;
 680
 681                 if (!aa_unpack_u32(e, &version, "version"))
 682                         goto fail_reset;
 683                 if (!aa_unpack_array(e, NULL, &size))
 684                         goto fail_reset;
 685                 *perms = kcalloc(size, sizeof(struct aa_perms), GFP_KERNEL);
 686                 if (!*perms)
 687                         goto fail_reset;
 688                 for (i = 0; i < size; i++) {
 689                         if (!unpack_perm(e, version, &(*perms)[i]))
 690                                 goto fail;
 691                 }
 692                 if (!aa_unpack_nameX(e, AA_ARRAYEND, NULL))
 693                         goto fail;
 694                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 695                         goto fail;
 696         } else
 697                 *perms = NULL;
 698
 699         return size;
 700
 701 fail:
 702         kfree(*perms);
 703 fail_reset:
 704         e->pos = pos;
 705         return -EPROTO;
 706 }
 707
 708 static int unpack_pdb(struct aa_ext *e, struct aa_policydb *policy,
 709                       bool required_dfa, bool required_trans,
 710                       const char **info)
 711 {
 712         void *pos = e->pos;
 713         int i, flags, error = -EPROTO;
 714         ssize_t size;
 715
 716         size = unpack_perms_table(e, &policy->perms);
 717         if (size < 0) {
 718                 error = size;
 719                 policy->perms = NULL;
 720                 *info = "failed to unpack - perms";
 721                 goto fail;
 722         }
 723         policy->size = size;
 724
 725         if (policy->perms) {
 726                 /* perms table present accept is index */
 727                 flags = TO_ACCEPT1_FLAG(YYTD_DATA32);
 728         } else {
 729                 /* packed perms in accept1 and accept2 */
 730                 flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
 731                         TO_ACCEPT2_FLAG(YYTD_DATA32);
 732         }
 733
 734         policy->dfa = unpack_dfa(e, flags);
 735         if (IS_ERR(policy->dfa)) {
 736                 error = PTR_ERR(policy->dfa);
 737                 policy->dfa = NULL;
 738                 *info = "failed to unpack - dfa";
 739                 goto fail;
 740         } else if (!policy->dfa) {
 741                 if (required_dfa) {
 742                         *info = "missing required dfa";
 743                         goto fail;
 744                 }
 745                 goto out;
 746         }
 747
 748         /*
 749          * only unpack the following if a dfa is present
 750          *
 751          * sadly start was given different names for file and policydb
 752          * but since it is optional we can try both
 753          */
 754         if (!aa_unpack_u32(e, &policy->start[0], "start"))
 755                 /* default start state */
 756                 policy->start[0] = DFA_START;
 757         if (!aa_unpack_u32(e, &policy->start[AA_CLASS_FILE], "dfa_start")) {
 758                 /* default start state for xmatch and file dfa */
 759                 policy->start[AA_CLASS_FILE] = DFA_START;
 760         }       /* setup class index */
 761         for (i = AA_CLASS_FILE + 1; i <= AA_CLASS_LAST; i++) {
 762                 policy->start[i] = aa_dfa_next(policy->dfa, policy->start[0],
 763                                                i);
 764         }
 765         if (!unpack_trans_table(e, &policy->trans) && required_trans) {
 766                 *info = "failed to unpack profile transition table";
 767                 goto fail;
 768         }
 769
 770         /* TODO: move compat mapping here, requires dfa merging first */
 771         /* TODO: move verify here, it has to be done after compat mappings */
 772 out:
 773         return 0;
 774
 775 fail:
 776         e->pos = pos;
 777         return error;
 778 }
 779
 780 static u32 strhash(const void *data, u32 len, u32 seed)
 781 {
 782         const char * const *key = data;
 783
 784         return jhash(*key, strlen(*key), seed);
 785 }
 786
 787 static int datacmp(struct rhashtable_compare_arg *arg, const void *obj)
 788 {
 789         const struct aa_data *data = obj;
 790         const char * const *key = arg->key;
 791
 792         return strcmp(data->key, *key);
 793 }
 794
 795 /**
 796  * unpack_profile - unpack a serialized profile
 797  * @e: serialized data extent information (NOT NULL)
 798  * @ns_name: pointer of newly allocated copy of %NULL in case of error
 799  *
 800  * NOTE: unpack profile sets audit struct if there is a failure
 801  */
 802 static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
 803 {
 804         struct aa_ruleset *rules;
 805         struct aa_profile *profile = NULL;
 806         const char *tmpname, *tmpns = NULL, *name = NULL;
 807         const char *info = "failed to unpack profile";
 808         size_t ns_len;
 809         struct rhashtable_params params = { 0 };
 810         char *key = NULL, *disconnected = NULL;
 811         struct aa_data *data;
 812         int error = -EPROTO;
 813         kernel_cap_t tmpcap;
 814         u32 tmp;
 815
 816         *ns_name = NULL;
 817
 818         /* check that we have the right struct being passed */
 819         if (!aa_unpack_nameX(e, AA_STRUCT, "profile"))
 820                 goto fail;
 821         if (!aa_unpack_str(e, &name, NULL))
 822                 goto fail;
 823         if (*name == '\0')
 824                 goto fail;
 825
 826         tmpname = aa_splitn_fqname(name, strlen(name), &tmpns, &ns_len);
 827         if (tmpns) {
 828                 *ns_name = kstrndup(tmpns, ns_len, GFP_KERNEL);
 829                 if (!*ns_name) {
 830                         info = "out of memory";
 831                         error = -ENOMEM;
 832                         goto fail;
 833                 }
 834                 name = tmpname;
 835         }
 836
 837         profile = aa_alloc_profile(name, NULL, GFP_KERNEL);
 838         if (!profile) {
 839                 info = "out of memory";
 840                 error = -ENOMEM;
 841                 goto fail;
 842         }
 843         rules = list_first_entry(&profile->rules, typeof(*rules), list);
 844
 845         /* profile renaming is optional */
 846         (void) aa_unpack_str(e, &profile->rename, "rename");
 847
 848         /* attachment string is optional */
 849         (void) aa_unpack_str(e, &profile->attach.xmatch_str, "attach");
 850
 851         /* xmatch is optional and may be NULL */
 852         error = unpack_pdb(e, &profile->attach.xmatch, false, false, &info);
 853         if (error) {
 854                 info = "bad xmatch";
 855                 goto fail;
 856         }
 857
 858         /* neither xmatch_len not xmatch_perms are optional if xmatch is set */
 859         if (profile->attach.xmatch.dfa) {
 860                 if (!aa_unpack_u32(e, &tmp, NULL)) {
 861                         info = "missing xmatch len";
 862                         goto fail;
 863                 }
 864                 profile->attach.xmatch_len = tmp;
 865                 profile->attach.xmatch.start[AA_CLASS_XMATCH] = DFA_START;
 866                 if (!profile->attach.xmatch.perms) {
 867                         error = aa_compat_map_xmatch(&profile->attach.xmatch);
 868                         if (error) {
 869                                 info = "failed to convert xmatch permission table";
 870                                 goto fail;
 871                         }
 872                 }
 873         }
 874
 875         /* disconnected attachment string is optional */
 876         (void) aa_unpack_strdup(e, &disconnected, "disconnected");
 877         profile->disconnected = disconnected;
 878
 879         /* per profile debug flags (complain, audit) */
 880         if (!aa_unpack_nameX(e, AA_STRUCT, "flags")) {
 881                 info = "profile missing flags";
 882                 goto fail;
 883         }
 884         info = "failed to unpack profile flags";
 885         if (!aa_unpack_u32(e, &tmp, NULL))
 886                 goto fail;
 887         if (tmp & PACKED_FLAG_HAT)
 888                 profile->label.flags |= FLAG_HAT;
 889         if (tmp & PACKED_FLAG_DEBUG1)
 890                 profile->label.flags |= FLAG_DEBUG1;
 891         if (tmp & PACKED_FLAG_DEBUG2)
 892                 profile->label.flags |= FLAG_DEBUG2;
 893         if (!aa_unpack_u32(e, &tmp, NULL))
 894                 goto fail;
 895         if (tmp == PACKED_MODE_COMPLAIN || (e->version & FORCE_COMPLAIN_FLAG)) {
 896                 profile->mode = APPARMOR_COMPLAIN;
 897         } else if (tmp == PACKED_MODE_ENFORCE) {
 898                 profile->mode = APPARMOR_ENFORCE;
 899         } else if (tmp == PACKED_MODE_KILL) {
 900                 profile->mode = APPARMOR_KILL;
 901         } else if (tmp == PACKED_MODE_UNCONFINED) {
 902                 profile->mode = APPARMOR_UNCONFINED;
 903                 profile->label.flags |= FLAG_UNCONFINED;
 904         } else if (tmp == PACKED_MODE_USER) {
 905                 profile->mode = APPARMOR_USER;
 906         } else {
 907                 goto fail;
 908         }
 909         if (!aa_unpack_u32(e, &tmp, NULL))
 910                 goto fail;
 911         if (tmp)
 912                 profile->audit = AUDIT_ALL;
 913
 914         if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 915                 goto fail;
 916
 917         /* path_flags is optional */
 918         if (aa_unpack_u32(e, &profile->path_flags, "path_flags"))
 919                 profile->path_flags |= profile->label.flags &
 920                         PATH_MEDIATE_DELETED;
 921         else
 922                 /* set a default value if path_flags field is not present */
 923                 profile->path_flags = PATH_MEDIATE_DELETED;
 924
 925         info = "failed to unpack profile capabilities";
 926         if (!aa_unpack_cap_low(e, &rules->caps.allow, NULL))
 927                 goto fail;
 928         if (!aa_unpack_cap_low(e, &rules->caps.audit, NULL))
 929                 goto fail;
 930         if (!aa_unpack_cap_low(e, &rules->caps.quiet, NULL))
 931                 goto fail;
 932         if (!aa_unpack_cap_low(e, &tmpcap, NULL))
 933                 goto fail;
 934
 935         info = "failed to unpack upper profile capabilities";
 936         if (aa_unpack_nameX(e, AA_STRUCT, "caps64")) {
 937                 /* optional upper half of 64 bit caps */
 938                 if (!aa_unpack_cap_high(e, &rules->caps.allow, NULL))
 939                         goto fail;
 940                 if (!aa_unpack_cap_high(e, &rules->caps.audit, NULL))
 941                         goto fail;
 942                 if (!aa_unpack_cap_high(e, &rules->caps.quiet, NULL))
 943                         goto fail;
 944                 if (!aa_unpack_cap_high(e, &tmpcap, NULL))
 945                         goto fail;
 946                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 947                         goto fail;
 948         }
 949
 950         info = "failed to unpack extended profile capabilities";
 951         if (aa_unpack_nameX(e, AA_STRUCT, "capsx")) {
 952                 /* optional extended caps mediation mask */
 953                 if (!aa_unpack_cap_low(e, &rules->caps.extended, NULL))
 954                         goto fail;
 955                 if (!aa_unpack_cap_high(e, &rules->caps.extended, NULL))
 956                         goto fail;
 957                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 958                         goto fail;
 959         }
 960
 961         if (!unpack_xattrs(e, profile)) {
 962                 info = "failed to unpack profile xattrs";
 963                 goto fail;
 964         }
 965
 966         if (!unpack_rlimits(e, rules)) {
 967                 info = "failed to unpack profile rlimits";
 968                 goto fail;
 969         }
 970
 971         if (!unpack_secmark(e, rules)) {
 972                 info = "failed to unpack profile secmark rules";
 973                 goto fail;
 974         }
 975
 976         if (aa_unpack_nameX(e, AA_STRUCT, "policydb")) {
 977                 /* generic policy dfa - optional and may be NULL */
 978                 info = "failed to unpack policydb";
 979                 error = unpack_pdb(e, &rules->policy, true, false,
 980                                    &info);
 981                 if (error)
 982                         goto fail;
 983                 /* Fixup: drop when we get rid of start array */
 984                 if (aa_dfa_next(rules->policy.dfa, rules->policy.start[0],
 985                                 AA_CLASS_FILE))
 986                         rules->policy.start[AA_CLASS_FILE] =
 987                           aa_dfa_next(rules->policy.dfa,
 988                                       rules->policy.start[0],
 989                                       AA_CLASS_FILE);
 990                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL))
 991                         goto fail;
 992                 if (!rules->policy.perms) {
 993                         error = aa_compat_map_policy(&rules->policy,
 994                                                      e->version);
 995                         if (error) {
 996                                 info = "failed to remap policydb permission table";
 997                                 goto fail;
 998                         }
 999                 }
1000         } else {
1001                 rules->policy.dfa = aa_get_dfa(nulldfa);
1002                 rules->policy.perms = kcalloc(2, sizeof(struct aa_perms),
1003                                               GFP_KERNEL);
1004                 if (!rules->policy.perms)
1005                         goto fail;
1006                 rules->policy.size = 2;
1007         }
1008         /* get file rules */
1009         error = unpack_pdb(e, &rules->file, false, true, &info);
1010         if (error) {
1011                 goto fail;
1012         } else if (rules->file.dfa) {
1013                 if (!rules->file.perms) {
1014                         error = aa_compat_map_file(&rules->file);
1015                         if (error) {
1016                                 info = "failed to remap file permission table";
1017                                 goto fail;
1018                         }
1019                 }
1020         } else if (rules->policy.dfa &&
1021                    rules->policy.start[AA_CLASS_FILE]) {
1022                 rules->file.dfa = aa_get_dfa(rules->policy.dfa);
1023                 rules->file.start[AA_CLASS_FILE] = rules->policy.start[AA_CLASS_FILE];
1024                 rules->file.perms = kcalloc(rules->policy.size,
1025                                             sizeof(struct aa_perms),
1026                                             GFP_KERNEL);
1027                 if (!rules->file.perms)
1028                         goto fail;
1029                 memcpy(rules->file.perms, rules->policy.perms,
1030                        rules->policy.size * sizeof(struct aa_perms));
1031                 rules->file.size = rules->policy.size;
1032         } else {
1033                 rules->file.dfa = aa_get_dfa(nulldfa);
1034                 rules->file.perms = kcalloc(2, sizeof(struct aa_perms),
1035                                             GFP_KERNEL);
1036                 if (!rules->file.perms)
1037                         goto fail;
1038                 rules->file.size = 2;
1039         }
1040         error = -EPROTO;
1041         if (aa_unpack_nameX(e, AA_STRUCT, "data")) {
1042                 info = "out of memory";
1043                 profile->data = kzalloc(sizeof(*profile->data), GFP_KERNEL);
1044                 if (!profile->data) {
1045                         error = -ENOMEM;
1046                         goto fail;
1047                 }
1048                 params.nelem_hint = 3;
1049                 params.key_len = sizeof(void *);
1050                 params.key_offset = offsetof(struct aa_data, key);
1051                 params.head_offset = offsetof(struct aa_data, head);
1052                 params.hashfn = strhash;
1053                 params.obj_cmpfn = datacmp;
1054
1055                 if (rhashtable_init(profile->data, &params)) {
1056                         info = "failed to init key, value hash table";
1057                         goto fail;
1058                 }
1059
1060                 while (aa_unpack_strdup(e, &key, NULL)) {
1061                         data = kzalloc(sizeof(*data), GFP_KERNEL);
1062                         if (!data) {
1063                                 kfree_sensitive(key);
1064                                 error = -ENOMEM;
1065                                 goto fail;
1066                         }
1067
1068                         data->key = key;
1069                         data->size = aa_unpack_blob(e, &data->data, NULL);
1070                         data->data = kvmemdup(data->data, data->size, GFP_KERNEL);
1071                         if (data->size && !data->data) {
1072                                 kfree_sensitive(data->key);
1073                                 kfree_sensitive(data);
1074                                 error = -ENOMEM;
1075                                 goto fail;
1076                         }
1077
1078                         if (rhashtable_insert_fast(profile->data, &data->head,
1079                                                    profile->data->p)) {
1080                                 kfree_sensitive(data->key);
1081                                 kfree_sensitive(data);
1082                                 info = "failed to insert data to table";
1083                                 goto fail;
1084                         }
1085                 }
1086
1087                 if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL)) {
1088                         info = "failed to unpack end of key, value data table";
1089                         goto fail;
1090                 }
1091         }
1092
1093         if (!aa_unpack_nameX(e, AA_STRUCTEND, NULL)) {
1094                 info = "failed to unpack end of profile";
1095                 goto fail;
1096         }
1097
1098         return profile;
1099
1100 fail:
1101         if (error == 0)
1102                 /* default error covers most cases */
1103                 error = -EPROTO;
1104         if (*ns_name) {
1105                 kfree(*ns_name);
1106                 *ns_name = NULL;
1107         }
1108         if (profile)
1109                 name = NULL;
1110         else if (!name)
1111                 name = "unknown";
1112         audit_iface(profile, NULL, name, info, e, error);
1113         aa_free_profile(profile);
1114
1115         return ERR_PTR(error);
1116 }
1117
1118 /**
1119  * verify_header - unpack serialized stream header
1120  * @e: serialized data read head (NOT NULL)
1121  * @required: whether the header is required or optional
1122  * @ns: Returns - namespace if one is specified else NULL (NOT NULL)
1123  *
1124  * Returns: error or 0 if header is good
1125  */
1126 static int verify_header(struct aa_ext *e, int required, const char **ns)
1127 {
1128         int error = -EPROTONOSUPPORT;
1129         const char *name = NULL;
1130         *ns = NULL;
1131
1132         /* get the interface version */
1133         if (!aa_unpack_u32(e, &e->version, "version")) {
1134                 if (required) {
1135                         audit_iface(NULL, NULL, NULL, "invalid profile format",
1136                                     e, error);
1137                         return error;
1138                 }
1139         }
1140
1141         /* Check that the interface version is currently supported.
1142          * if not specified use previous version
1143          * Mask off everything that is not kernel abi version
1144          */
1145         if (VERSION_LT(e->version, v5) || VERSION_GT(e->version, v9)) {
1146                 audit_iface(NULL, NULL, NULL, "unsupported interface version",
1147                             e, error);
1148                 return error;
1149         }
1150
1151         /* read the namespace if present */
1152         if (aa_unpack_str(e, &name, "namespace")) {
1153                 if (*name == '\0') {
1154                         audit_iface(NULL, NULL, NULL, "invalid namespace name",
1155                                     e, error);
1156                         return error;
1157                 }
1158                 if (*ns && strcmp(*ns, name)) {
1159                         audit_iface(NULL, NULL, NULL, "invalid ns change", e,
1160                                     error);
1161                 } else if (!*ns) {
1162                         *ns = kstrdup(name, GFP_KERNEL);
1163                         if (!*ns)
1164                                 return -ENOMEM;
1165                 }
1166         }
1167
1168         return 0;
1169 }
1170
1171 /**
1172  * verify_dfa_accept_index - verify accept indexes are in range of perms table
1173  * @dfa: the dfa to check accept indexes are in range
1174  * table_size: the permission table size the indexes should be within
1175  */
1176 static bool verify_dfa_accept_index(struct aa_dfa *dfa, int table_size)
1177 {
1178         int i;
1179         for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
1180                 if (ACCEPT_TABLE(dfa)[i] >= table_size)
1181                         return false;
1182         }
1183         return true;
1184 }
1185
1186 static bool verify_perm(struct aa_perms *perm)
1187 {
1188         /* TODO: allow option to just force the perms into a valid state */
1189         if (perm->allow & perm->deny)
1190                 return false;
1191         if (perm->subtree & ~perm->allow)
1192                 return false;
1193         if (perm->cond & (perm->allow | perm->deny))
1194                 return false;
1195         if (perm->kill & perm->allow)
1196                 return false;
1197         if (perm->complain & (perm->allow | perm->deny))
1198                 return false;
1199         if (perm->prompt & (perm->allow | perm->deny))
1200                 return false;
1201         if (perm->complain & perm->prompt)
1202                 return false;
1203         if (perm->hide & perm->allow)
1204                 return false;
1205
1206         return true;
1207 }
1208
1209 static bool verify_perms(struct aa_policydb *pdb)
1210 {
1211         int i;
1212
1213         for (i = 0; i < pdb->size; i++) {
1214                 if (!verify_perm(&pdb->perms[i]))
1215                         return false;
1216                 /* verify indexes into str table */
1217                 if ((pdb->perms[i].xindex & AA_X_TYPE_MASK) == AA_X_TABLE &&
1218                     (pdb->perms[i].xindex & AA_X_INDEX_MASK) >= pdb->trans.size)
1219                         return false;
1220                 if (pdb->perms[i].tag && pdb->perms[i].tag >= pdb->trans.size)
1221                         return false;
1222                 if (pdb->perms[i].label &&
1223                     pdb->perms[i].label >= pdb->trans.size)
1224                         return false;
1225         }
1226
1227         return true;
1228 }
1229
1230 /**
1231  * verify_profile - Do post unpack analysis to verify profile consistency
1232  * @profile: profile to verify (NOT NULL)
1233  *
1234  * Returns: 0 if passes verification else error
1235  *
1236  * This verification is post any unpack mapping or changes
1237  */
1238 static int verify_profile(struct aa_profile *profile)
1239 {
1240         struct aa_ruleset *rules = list_first_entry(&profile->rules,
1241                                                     typeof(*rules), list);
1242         if (!rules)
1243                 return 0;
1244
1245         if ((rules->file.dfa && !verify_dfa_accept_index(rules->file.dfa,
1246                                                          rules->file.size)) ||
1247             (rules->policy.dfa &&
1248              !verify_dfa_accept_index(rules->policy.dfa, rules->policy.size))) {
1249                 audit_iface(profile, NULL, NULL,
1250                             "Unpack: Invalid named transition", NULL, -EPROTO);
1251                 return -EPROTO;
1252         }
1253
1254         if (!verify_perms(&rules->file)) {
1255                 audit_iface(profile, NULL, NULL,
1256                             "Unpack: Invalid perm index", NULL, -EPROTO);
1257                 return -EPROTO;
1258         }
1259         if (!verify_perms(&rules->policy)) {
1260                 audit_iface(profile, NULL, NULL,
1261                             "Unpack: Invalid perm index", NULL, -EPROTO);
1262                 return -EPROTO;
1263         }
1264         if (!verify_perms(&profile->attach.xmatch)) {
1265                 audit_iface(profile, NULL, NULL,
1266                             "Unpack: Invalid perm index", NULL, -EPROTO);
1267                 return -EPROTO;
1268         }
1269
1270         return 0;
1271 }
1272
1273 void aa_load_ent_free(struct aa_load_ent *ent)
1274 {
1275         if (ent) {
1276                 aa_put_profile(ent->rename);
1277                 aa_put_profile(ent->old);
1278                 aa_put_profile(ent->new);
1279                 kfree(ent->ns_name);
1280                 kfree_sensitive(ent);
1281         }
1282 }
1283
1284 struct aa_load_ent *aa_load_ent_alloc(void)
1285 {
1286         struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
1287         if (ent)
1288                 INIT_LIST_HEAD(&ent->list);
1289         return ent;
1290 }
1291
1292 static int compress_zstd(const char *src, size_t slen, char **dst, size_t *dlen)
1293 {
1294 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1295         const zstd_parameters params =
1296                 zstd_get_params(aa_g_rawdata_compression_level, slen);
1297         const size_t wksp_len = zstd_cctx_workspace_bound(&params.cParams);
1298         void *wksp = NULL;
1299         zstd_cctx *ctx = NULL;
1300         size_t out_len = zstd_compress_bound(slen);
1301         void *out = NULL;
1302         int ret = 0;
1303
1304         out = kvzalloc(out_len, GFP_KERNEL);
1305         if (!out) {
1306                 ret = -ENOMEM;
1307                 goto cleanup;
1308         }
1309
1310         wksp = kvzalloc(wksp_len, GFP_KERNEL);
1311         if (!wksp) {
1312                 ret = -ENOMEM;
1313                 goto cleanup;
1314         }
1315
1316         ctx = zstd_init_cctx(wksp, wksp_len);
1317         if (!ctx) {
1318                 ret = -EINVAL;
1319                 goto cleanup;
1320         }
1321
1322         out_len = zstd_compress_cctx(ctx, out, out_len, src, slen, &params);
1323         if (zstd_is_error(out_len) || out_len >= slen) {
1324                 ret = -EINVAL;
1325                 goto cleanup;
1326         }
1327
1328         if (is_vmalloc_addr(out)) {
1329                 *dst = kvzalloc(out_len, GFP_KERNEL);
1330                 if (*dst) {
1331                         memcpy(*dst, out, out_len);
1332                         kvfree(out);
1333                         out = NULL;
1334                 }
1335         } else {
1336                 /*
1337                  * If the staging buffer was kmalloc'd, then using krealloc is
1338                  * probably going to be faster. The destination buffer will
1339                  * always be smaller, so it's just shrunk, avoiding a memcpy
1340                  */
1341                 *dst = krealloc(out, out_len, GFP_KERNEL);
1342         }
1343
1344         if (!*dst) {
1345                 ret = -ENOMEM;
1346                 goto cleanup;
1347         }
1348
1349         *dlen = out_len;
1350
1351 cleanup:
1352         if (ret) {
1353                 kvfree(out);
1354                 *dst = NULL;
1355         }
1356
1357         kvfree(wksp);
1358         return ret;
1359 #else
1360         *dlen = slen;
1361         return 0;
1362 #endif
1363 }
1364
1365 static int compress_loaddata(struct aa_loaddata *data)
1366 {
1367         AA_BUG(data->compressed_size > 0);
1368
1369         /*
1370          * Shortcut the no compression case, else we increase the amount of
1371          * storage required by a small amount
1372          */
1373         if (aa_g_rawdata_compression_level != 0) {
1374                 void *udata = data->data;
1375                 int error = compress_zstd(udata, data->size, &data->data,
1376                                           &data->compressed_size);
1377                 if (error) {
1378                         data->compressed_size = data->size;
1379                         return error;
1380                 }
1381                 if (udata != data->data)
1382                         kvfree(udata);
1383         } else
1384                 data->compressed_size = data->size;
1385
1386         return 0;
1387 }
1388
1389 /**
1390  * aa_unpack - unpack packed binary profile(s) data loaded from user space
1391  * @udata: user data copied to kmem  (NOT NULL)
1392  * @lh: list to place unpacked profiles in a aa_repl_ws
1393  * @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
1394  *
1395  * Unpack user data and return refcounted allocated profile(s) stored in
1396  * @lh in order of discovery, with the list chain stored in base.list
1397  * or error
1398  *
1399  * Returns: profile(s) on @lh else error pointer if fails to unpack
1400  */
1401 int aa_unpack(struct aa_loaddata *udata, struct list_head *lh,
1402               const char **ns)
1403 {
1404         struct aa_load_ent *tmp, *ent;
1405         struct aa_profile *profile = NULL;
1406         char *ns_name = NULL;
1407         int error;
1408         struct aa_ext e = {
1409                 .start = udata->data,
1410                 .end = udata->data + udata->size,
1411                 .pos = udata->data,
1412         };
1413
1414         *ns = NULL;
1415         while (e.pos < e.end) {
1416                 void *start;
1417                 error = verify_header(&e, e.pos == e.start, ns);
1418                 if (error)
1419                         goto fail;
1420
1421                 start = e.pos;
1422                 profile = unpack_profile(&e, &ns_name);
1423                 if (IS_ERR(profile)) {
1424                         error = PTR_ERR(profile);
1425                         goto fail;
1426                 }
1427
1428                 error = verify_profile(profile);
1429                 if (error)
1430                         goto fail_profile;
1431
1432                 if (aa_g_hash_policy)
1433                         error = aa_calc_profile_hash(profile, e.version, start,
1434                                                      e.pos - start);
1435                 if (error)
1436                         goto fail_profile;
1437
1438                 ent = aa_load_ent_alloc();
1439                 if (!ent) {
1440                         error = -ENOMEM;
1441                         goto fail_profile;
1442                 }
1443
1444                 ent->new = profile;
1445                 ent->ns_name = ns_name;
1446                 ns_name = NULL;
1447                 list_add_tail(&ent->list, lh);
1448         }
1449         udata->abi = e.version & K_ABI_MASK;
1450         if (aa_g_hash_policy) {
1451                 udata->hash = aa_calc_hash(udata->data, udata->size);
1452                 if (IS_ERR(udata->hash)) {
1453                         error = PTR_ERR(udata->hash);
1454                         udata->hash = NULL;
1455                         goto fail;
1456                 }
1457         }
1458
1459         if (aa_g_export_binary) {
1460                 error = compress_loaddata(udata);
1461                 if (error)
1462                         goto fail;
1463         }
1464         return 0;
1465
1466 fail_profile:
1467         kfree(ns_name);
1468         aa_put_profile(profile);
1469
1470 fail:
1471         list_for_each_entry_safe(ent, tmp, lh, list) {
1472                 list_del_init(&ent->list);
1473                 aa_load_ent_free(ent);
1474         }
1475
1476         return error;
1477 }