security/apparmor/policy_unpack.c

   1 /*
   2  * AppArmor security module
   3  *
   4  * This file contains AppArmor functions for unpacking policy loaded from
   5  * userspace.
   6  *
   7  * Copyright (C) 1998-2008 Novell/SUSE
   8  * Copyright 2009-2010 Canonical Ltd.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License as
  12  * published by the Free Software Foundation, version 2 of the
  13  * License.
  14  *
  15  * AppArmor uses a serialized binary format for loading policy. To find
  16  * policy format documentation look in Documentation/security/apparmor.txt
  17  * All policy is validated before it is used.
  18  */
  19
  20 #include <asm/unaligned.h>
  21 #include <linux/ctype.h>
  22 #include <linux/errno.h>
  23
  24 #include "include/apparmor.h"
  25 #include "include/audit.h"
  26 #include "include/context.h"
  27 #include "include/match.h"
  28 #include "include/policy.h"
  29 #include "include/policy_unpack.h"
  30
  31 /*
  32  * The AppArmor interface treats data as a type byte followed by the
  33  * actual data.  The interface has the notion of a a named entry
  34  * which has a name (AA_NAME typecode followed by name string) followed by
  35  * the entries typecode and data.  Named types allow for optional
  36  * elements and extensions to be added and tested for without breaking
  37  * backwards compatibility.
  38  */
  39
  40 enum aa_code {
  41         AA_U8,
  42         AA_U16,
  43         AA_U32,
  44         AA_U64,
  45         AA_NAME,                /* same as string except it is items name */
  46         AA_STRING,
  47         AA_BLOB,
  48         AA_STRUCT,
  49         AA_STRUCTEND,
  50         AA_LIST,
  51         AA_LISTEND,
  52         AA_ARRAY,
  53         AA_ARRAYEND,
  54 };
  55
  56 /*
  57  * aa_ext is the read of the buffer containing the serialized profile.  The
  58  * data is copied into a kernel buffer in apparmorfs and then handed off to
  59  * the unpack routines.
  60  */
  61 struct aa_ext {
  62         void *start;
  63         void *end;
  64         void *pos;              /* pointer to current position in the buffer */
  65         u32 version;
  66 };
  67
  68 /* audit callback for unpack fields */
  69 static void audit_cb(struct audit_buffer *ab, void *va)
  70 {
  71         struct common_audit_data *sa = va;
  72         if (sa->aad->iface.target) {
  73                 struct aa_profile *name = sa->aad->iface.target;
  74                 audit_log_format(ab, " name=");
  75                 audit_log_untrustedstring(ab, name->base.hname);
  76         }
  77         if (sa->aad->iface.pos)
  78                 audit_log_format(ab, " offset=%ld", sa->aad->iface.pos);
  79 }
  80
  81 /**
  82  * audit_iface - do audit message for policy unpacking/load/replace/remove
  83  * @new: profile if it has been allocated (MAYBE NULL)
  84  * @name: name of the profile being manipulated (MAYBE NULL)
  85  * @info: any extra info about the failure (MAYBE NULL)
  86  * @e: buffer position info
  87  * @error: error code
  88  *
  89  * Returns: %0 or error
  90  */
  91 static int audit_iface(struct aa_profile *new, const char *name,
  92                        const char *info, struct aa_ext *e, int error)
  93 {
  94         struct aa_profile *profile = __aa_current_profile();
  95         struct common_audit_data sa;
  96         struct apparmor_audit_data aad = {0,};
  97         sa.type = LSM_AUDIT_DATA_NONE;
  98         sa.aad = &aad;
  99         if (e)
 100                 aad.iface.pos = e->pos - e->start;
 101         aad.iface.target = new;
 102         aad.name = name;
 103         aad.info = info;
 104         aad.error = error;
 105
 106         return aa_audit(AUDIT_APPARMOR_STATUS, profile, GFP_KERNEL, &sa,
 107                         audit_cb);
 108 }
 109
 110 /* test if read will be in packed data bounds */
 111 static bool inbounds(struct aa_ext *e, size_t size)
 112 {
 113         return (size <= e->end - e->pos);
 114 }
 115
 116 /**
 117  * aa_u16_chunck - test and do bounds checking for a u16 size based chunk
 118  * @e: serialized data read head (NOT NULL)
 119  * @chunk: start address for chunk of data (NOT NULL)
 120  *
 121  * Returns: the size of chunk found with the read head at the end of the chunk.
 122  */
 123 static size_t unpack_u16_chunk(struct aa_ext *e, char **chunk)
 124 {
 125         size_t size = 0;
 126
 127         if (!inbounds(e, sizeof(u16)))
 128                 return 0;
 129         size = le16_to_cpu(get_unaligned((u16 *) e->pos));
 130         e->pos += sizeof(u16);
 131         if (!inbounds(e, size))
 132                 return 0;
 133         *chunk = e->pos;
 134         e->pos += size;
 135         return size;
 136 }
 137
 138 /* unpack control byte */
 139 static bool unpack_X(struct aa_ext *e, enum aa_code code)
 140 {
 141         if (!inbounds(e, 1))
 142                 return 0;
 143         if (*(u8 *) e->pos != code)
 144                 return 0;
 145         e->pos++;
 146         return 1;
 147 }
 148
 149 /**
 150  * unpack_nameX - check is the next element is of type X with a name of @name
 151  * @e: serialized data extent information  (NOT NULL)
 152  * @code: type code
 153  * @name: name to match to the serialized element.  (MAYBE NULL)
 154  *
 155  * check that the next serialized data element is of type X and has a tag
 156  * name @name.  If @name is specified then there must be a matching
 157  * name element in the stream.  If @name is NULL any name element will be
 158  * skipped and only the typecode will be tested.
 159  *
 160  * Returns 1 on success (both type code and name tests match) and the read
 161  * head is advanced past the headers
 162  *
 163  * Returns: 0 if either match fails, the read head does not move
 164  */
 165 static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
 166 {
 167         /*
 168          * May need to reset pos if name or type doesn't match
 169          */
 170         void *pos = e->pos;
 171         /*
 172          * Check for presence of a tagname, and if present name size
 173          * AA_NAME tag value is a u16.
 174          */
 175         if (unpack_X(e, AA_NAME)) {
 176                 char *tag = NULL;
 177                 size_t size = unpack_u16_chunk(e, &tag);
 178                 /* if a name is specified it must match. otherwise skip tag */
 179                 if (name && (!size || strcmp(name, tag)))
 180                         goto fail;
 181         } else if (name) {
 182                 /* if a name is specified and there is no name tag fail */
 183                 goto fail;
 184         }
 185
 186         /* now check if type code matches */
 187         if (unpack_X(e, code))
 188                 return 1;
 189
 190 fail:
 191         e->pos = pos;
 192         return 0;
 193 }
 194
 195 static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
 196 {
 197         if (unpack_nameX(e, AA_U32, name)) {
 198                 if (!inbounds(e, sizeof(u32)))
 199                         return 0;
 200                 if (data)
 201                         *data = le32_to_cpu(get_unaligned((u32 *) e->pos));
 202                 e->pos += sizeof(u32);
 203                 return 1;
 204         }
 205         return 0;
 206 }
 207
 208 static bool unpack_u64(struct aa_ext *e, u64 *data, const char *name)
 209 {
 210         if (unpack_nameX(e, AA_U64, name)) {
 211                 if (!inbounds(e, sizeof(u64)))
 212                         return 0;
 213                 if (data)
 214                         *data = le64_to_cpu(get_unaligned((u64 *) e->pos));
 215                 e->pos += sizeof(u64);
 216                 return 1;
 217         }
 218         return 0;
 219 }
 220
 221 static size_t unpack_array(struct aa_ext *e, const char *name)
 222 {
 223         if (unpack_nameX(e, AA_ARRAY, name)) {
 224                 int size;
 225                 if (!inbounds(e, sizeof(u16)))
 226                         return 0;
 227                 size = (int)le16_to_cpu(get_unaligned((u16 *) e->pos));
 228                 e->pos += sizeof(u16);
 229                 return size;
 230         }
 231         return 0;
 232 }
 233
 234 static size_t unpack_blob(struct aa_ext *e, char **blob, const char *name)
 235 {
 236         if (unpack_nameX(e, AA_BLOB, name)) {
 237                 u32 size;
 238                 if (!inbounds(e, sizeof(u32)))
 239                         return 0;
 240                 size = le32_to_cpu(get_unaligned((u32 *) e->pos));
 241                 e->pos += sizeof(u32);
 242                 if (inbounds(e, (size_t) size)) {
 243                         *blob = e->pos;
 244                         e->pos += size;
 245                         return size;
 246                 }
 247         }
 248         return 0;
 249 }
 250
 251 static int unpack_str(struct aa_ext *e, const char **string, const char *name)
 252 {
 253         char *src_str;
 254         size_t size = 0;
 255         void *pos = e->pos;
 256         *string = NULL;
 257         if (unpack_nameX(e, AA_STRING, name)) {
 258                 size = unpack_u16_chunk(e, &src_str);
 259                 if (size) {
 260                         /* strings are null terminated, length is size - 1 */
 261                         if (src_str[size - 1] != 0)
 262                                 goto fail;
 263                         *string = src_str;
 264                 }
 265         }
 266         return size;
 267
 268 fail:
 269         e->pos = pos;
 270         return 0;
 271 }
 272
 273 static int unpack_strdup(struct aa_ext *e, char **string, const char *name)
 274 {
 275         const char *tmp;
 276         void *pos = e->pos;
 277         int res = unpack_str(e, &tmp, name);
 278         *string = NULL;
 279
 280         if (!res)
 281                 return 0;
 282
 283         *string = kmemdup(tmp, res, GFP_KERNEL);
 284         if (!*string) {
 285                 e->pos = pos;
 286                 return 0;
 287         }
 288
 289         return res;
 290 }
 291
 292 #define DFA_VALID_PERM_MASK             0xffffffff
 293 #define DFA_VALID_PERM2_MASK            0xffffffff
 294
 295 /**
 296  * verify_accept - verify the accept tables of a dfa
 297  * @dfa: dfa to verify accept tables of (NOT NULL)
 298  * @flags: flags governing dfa
 299  *
 300  * Returns: 1 if valid accept tables else 0 if error
 301  */
 302 static bool verify_accept(struct aa_dfa *dfa, int flags)
 303 {
 304         int i;
 305
 306         /* verify accept permissions */
 307         for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
 308                 int mode = ACCEPT_TABLE(dfa)[i];
 309
 310                 if (mode & ~DFA_VALID_PERM_MASK)
 311                         return 0;
 312
 313                 if (ACCEPT_TABLE2(dfa)[i] & ~DFA_VALID_PERM2_MASK)
 314                         return 0;
 315         }
 316         return 1;
 317 }
 318
 319 /**
 320  * unpack_dfa - unpack a file rule dfa
 321  * @e: serialized data extent information (NOT NULL)
 322  *
 323  * returns dfa or ERR_PTR or NULL if no dfa
 324  */
 325 static struct aa_dfa *unpack_dfa(struct aa_ext *e)
 326 {
 327         char *blob = NULL;
 328         size_t size;
 329         struct aa_dfa *dfa = NULL;
 330
 331         size = unpack_blob(e, &blob, "aadfa");
 332         if (size) {
 333                 /*
 334                  * The dfa is aligned with in the blob to 8 bytes
 335                  * from the beginning of the stream.
 336                  */
 337                 size_t sz = blob - (char *)e->start;
 338                 size_t pad = ALIGN(sz, 8) - sz;
 339                 int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
 340                         TO_ACCEPT2_FLAG(YYTD_DATA32);
 341
 342
 343                 if (aa_g_paranoid_load)
 344                         flags |= DFA_FLAG_VERIFY_STATES;
 345
 346                 dfa = aa_dfa_unpack(blob + pad, size - pad, flags);
 347
 348                 if (IS_ERR(dfa))
 349                         return dfa;
 350
 351                 if (!verify_accept(dfa, flags))
 352                         goto fail;
 353         }
 354
 355         return dfa;
 356
 357 fail:
 358         aa_put_dfa(dfa);
 359         return ERR_PTR(-EPROTO);
 360 }
 361
 362 /**
 363  * unpack_trans_table - unpack a profile transition table
 364  * @e: serialized data extent information  (NOT NULL)
 365  * @profile: profile to add the accept table to (NOT NULL)
 366  *
 367  * Returns: 1 if table successfully unpacked
 368  */
 369 static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
 370 {
 371         void *pos = e->pos;
 372
 373         /* exec table is optional */
 374         if (unpack_nameX(e, AA_STRUCT, "xtable")) {
 375                 int i, size;
 376
 377                 size = unpack_array(e, NULL);
 378                 /* currently 4 exec bits and entries 0-3 are reserved iupcx */
 379                 if (size > 16 - 4)
 380                         goto fail;
 381                 profile->file.trans.table = kzalloc(sizeof(char *) * size,
 382                                                     GFP_KERNEL);
 383                 if (!profile->file.trans.table)
 384                         goto fail;
 385
 386                 profile->file.trans.size = size;
 387                 for (i = 0; i < size; i++) {
 388                         char *str;
 389                         int c, j, size2 = unpack_strdup(e, &str, NULL);
 390                         /* unpack_strdup verifies that the last character is
 391                          * null termination byte.
 392                          */
 393                         if (!size2)
 394                                 goto fail;
 395                         profile->file.trans.table[i] = str;
 396                         /* verify that name doesn't start with space */
 397                         if (isspace(*str))
 398                                 goto fail;
 399
 400                         /* count internal #  of internal \0 */
 401                         for (c = j = 0; j < size2 - 2; j++) {
 402                                 if (!str[j])
 403                                         c++;
 404                         }
 405                         if (*str == ':') {
 406                                 /* beginning with : requires an embedded \0,
 407                                  * verify that exactly 1 internal \0 exists
 408                                  * trailing \0 already verified by unpack_strdup
 409                                  */
 410                                 if (c != 1)
 411                                         goto fail;
 412                                 /* first character after : must be valid */
 413                                 if (!str[1])
 414                                         goto fail;
 415                         } else if (c)
 416                                 /* fail - all other cases with embedded \0 */
 417                                 goto fail;
 418                 }
 419                 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
 420                         goto fail;
 421                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 422                         goto fail;
 423         }
 424         return 1;
 425
 426 fail:
 427         aa_free_domain_entries(&profile->file.trans);
 428         e->pos = pos;
 429         return 0;
 430 }
 431
 432 static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile)
 433 {
 434         void *pos = e->pos;
 435
 436         /* rlimits are optional */
 437         if (unpack_nameX(e, AA_STRUCT, "rlimits")) {
 438                 int i, size;
 439                 u32 tmp = 0;
 440                 if (!unpack_u32(e, &tmp, NULL))
 441                         goto fail;
 442                 profile->rlimits.mask = tmp;
 443
 444                 size = unpack_array(e, NULL);
 445                 if (size > RLIM_NLIMITS)
 446                         goto fail;
 447                 for (i = 0; i < size; i++) {
 448                         u64 tmp2 = 0;
 449                         int a = aa_map_resource(i);
 450                         if (!unpack_u64(e, &tmp2, NULL))
 451                                 goto fail;
 452                         profile->rlimits.limits[a].rlim_max = tmp2;
 453                 }
 454                 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
 455                         goto fail;
 456                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 457                         goto fail;
 458         }
 459         return 1;
 460
 461 fail:
 462         e->pos = pos;
 463         return 0;
 464 }
 465
 466 /**
 467  * unpack_profile - unpack a serialized profile
 468  * @e: serialized data extent information (NOT NULL)
 469  *
 470  * NOTE: unpack profile sets audit struct if there is a failure
 471  */
 472 static struct aa_profile *unpack_profile(struct aa_ext *e)
 473 {
 474         struct aa_profile *profile = NULL;
 475         const char *name = NULL;
 476         int i, error = -EPROTO;
 477         kernel_cap_t tmpcap;
 478         u32 tmp;
 479
 480         /* check that we have the right struct being passed */
 481         if (!unpack_nameX(e, AA_STRUCT, "profile"))
 482                 goto fail;
 483         if (!unpack_str(e, &name, NULL))
 484                 goto fail;
 485
 486         profile = aa_alloc_profile(name);
 487         if (!profile)
 488                 return ERR_PTR(-ENOMEM);
 489
 490         /* profile renaming is optional */
 491         (void) unpack_str(e, &profile->rename, "rename");
 492
 493         /* xmatch is optional and may be NULL */
 494         profile->xmatch = unpack_dfa(e);
 495         if (IS_ERR(profile->xmatch)) {
 496                 error = PTR_ERR(profile->xmatch);
 497                 profile->xmatch = NULL;
 498                 goto fail;
 499         }
 500         /* xmatch_len is not optional if xmatch is set */
 501         if (profile->xmatch) {
 502                 if (!unpack_u32(e, &tmp, NULL))
 503                         goto fail;
 504                 profile->xmatch_len = tmp;
 505         }
 506
 507         /* per profile debug flags (complain, audit) */
 508         if (!unpack_nameX(e, AA_STRUCT, "flags"))
 509                 goto fail;
 510         if (!unpack_u32(e, &tmp, NULL))
 511                 goto fail;
 512         if (tmp)
 513                 profile->flags |= PFLAG_HAT;
 514         if (!unpack_u32(e, &tmp, NULL))
 515                 goto fail;
 516         if (tmp)
 517                 profile->mode = APPARMOR_COMPLAIN;
 518         if (!unpack_u32(e, &tmp, NULL))
 519                 goto fail;
 520         if (tmp)
 521                 profile->audit = AUDIT_ALL;
 522
 523         if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 524                 goto fail;
 525
 526         /* path_flags is optional */
 527         if (unpack_u32(e, &profile->path_flags, "path_flags"))
 528                 profile->path_flags |= profile->flags & PFLAG_MEDIATE_DELETED;
 529         else
 530                 /* set a default value if path_flags field is not present */
 531                 profile->path_flags = PFLAG_MEDIATE_DELETED;
 532
 533         if (!unpack_u32(e, &(profile->caps.allow.cap[0]), NULL))
 534                 goto fail;
 535         if (!unpack_u32(e, &(profile->caps.audit.cap[0]), NULL))
 536                 goto fail;
 537         if (!unpack_u32(e, &(profile->caps.quiet.cap[0]), NULL))
 538                 goto fail;
 539         if (!unpack_u32(e, &tmpcap.cap[0], NULL))
 540                 goto fail;
 541
 542         if (unpack_nameX(e, AA_STRUCT, "caps64")) {
 543                 /* optional upper half of 64 bit caps */
 544                 if (!unpack_u32(e, &(profile->caps.allow.cap[1]), NULL))
 545                         goto fail;
 546                 if (!unpack_u32(e, &(profile->caps.audit.cap[1]), NULL))
 547                         goto fail;
 548                 if (!unpack_u32(e, &(profile->caps.quiet.cap[1]), NULL))
 549                         goto fail;
 550                 if (!unpack_u32(e, &(tmpcap.cap[1]), NULL))
 551                         goto fail;
 552                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 553                         goto fail;
 554         }
 555
 556         if (unpack_nameX(e, AA_STRUCT, "capsx")) {
 557                 /* optional extended caps mediation mask */
 558                 if (!unpack_u32(e, &(profile->caps.extended.cap[0]), NULL))
 559                         goto fail;
 560                 if (!unpack_u32(e, &(profile->caps.extended.cap[1]), NULL))
 561                         goto fail;
 562                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 563                         goto fail;
 564         }
 565
 566         if (!unpack_rlimits(e, profile))
 567                 goto fail;
 568
 569         if (unpack_nameX(e, AA_STRUCT, "policydb")) {
 570                 /* generic policy dfa - optional and may be NULL */
 571                 profile->policy.dfa = unpack_dfa(e);
 572                 if (IS_ERR(profile->policy.dfa)) {
 573                         error = PTR_ERR(profile->policy.dfa);
 574                         profile->policy.dfa = NULL;
 575                         goto fail;
 576                 }
 577                 if (!unpack_u32(e, &profile->policy.start[0], "start"))
 578                         /* default start state */
 579                         profile->policy.start[0] = DFA_START;
 580                 /* setup class index */
 581                 for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) {
 582                         profile->policy.start[i] =
 583                                 aa_dfa_next(profile->policy.dfa,
 584                                             profile->policy.start[0],
 585                                             i);
 586                 }
 587                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 588                         goto fail;
 589         }
 590
 591         /* get file rules */
 592         profile->file.dfa = unpack_dfa(e);
 593         if (IS_ERR(profile->file.dfa)) {
 594                 error = PTR_ERR(profile->file.dfa);
 595                 profile->file.dfa = NULL;
 596                 goto fail;
 597         }
 598
 599         if (!unpack_u32(e, &profile->file.start, "dfa_start"))
 600                 /* default start state */
 601                 profile->file.start = DFA_START;
 602
 603         if (!unpack_trans_table(e, profile))
 604                 goto fail;
 605
 606         if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 607                 goto fail;
 608
 609         return profile;
 610
 611 fail:
 612         if (profile)
 613                 name = NULL;
 614         else if (!name)
 615                 name = "unknown";
 616         audit_iface(profile, name, "failed to unpack profile", e, error);
 617         aa_put_profile(profile);
 618
 619         return ERR_PTR(error);
 620 }
 621
 622 /**
 623  * verify_head - unpack serialized stream header
 624  * @e: serialized data read head (NOT NULL)
 625  * @ns: Returns - namespace if one is specified else NULL (NOT NULL)
 626  *
 627  * Returns: error or 0 if header is good
 628  */
 629 static int verify_header(struct aa_ext *e, const char **ns)
 630 {
 631         int error = -EPROTONOSUPPORT;
 632         /* get the interface version */
 633         if (!unpack_u32(e, &e->version, "version")) {
 634                 audit_iface(NULL, NULL, "invalid profile format", e, error);
 635                 return error;
 636         }
 637
 638         /* check that the interface version is currently supported */
 639         if (e->version != 5) {
 640                 audit_iface(NULL, NULL, "unsupported interface version", e,
 641                             error);
 642                 return error;
 643         }
 644
 645         /* read the namespace if present */
 646         if (!unpack_str(e, ns, "namespace"))
 647                 *ns = NULL;
 648
 649         return 0;
 650 }
 651
 652 static bool verify_xindex(int xindex, int table_size)
 653 {
 654         int index, xtype;
 655         xtype = xindex & AA_X_TYPE_MASK;
 656         index = xindex & AA_X_INDEX_MASK;
 657         if (xtype == AA_X_TABLE && index > table_size)
 658                 return 0;
 659         return 1;
 660 }
 661
 662 /* verify dfa xindexes are in range of transition tables */
 663 static bool verify_dfa_xindex(struct aa_dfa *dfa, int table_size)
 664 {
 665         int i;
 666         for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
 667                 if (!verify_xindex(dfa_user_xindex(dfa, i), table_size))
 668                         return 0;
 669                 if (!verify_xindex(dfa_other_xindex(dfa, i), table_size))
 670                         return 0;
 671         }
 672         return 1;
 673 }
 674
 675 /**
 676  * verify_profile - Do post unpack analysis to verify profile consistency
 677  * @profile: profile to verify (NOT NULL)
 678  *
 679  * Returns: 0 if passes verification else error
 680  */
 681 static int verify_profile(struct aa_profile *profile)
 682 {
 683         if (aa_g_paranoid_load) {
 684                 if (profile->file.dfa &&
 685                     !verify_dfa_xindex(profile->file.dfa,
 686                                        profile->file.trans.size)) {
 687                         audit_iface(profile, NULL, "Invalid named transition",
 688                                     NULL, -EPROTO);
 689                         return -EPROTO;
 690                 }
 691         }
 692
 693         return 0;
 694 }
 695
 696 /**
 697  * aa_unpack - unpack packed binary profile data loaded from user space
 698  * @udata: user data copied to kmem  (NOT NULL)
 699  * @size: the size of the user data
 700  * @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
 701  *
 702  * Unpack user data and return refcounted allocated profile or ERR_PTR
 703  *
 704  * Returns: profile else error pointer if fails to unpack
 705  */
 706 struct aa_profile *aa_unpack(void *udata, size_t size, const char **ns)
 707 {
 708         struct aa_profile *profile = NULL;
 709         int error;
 710         struct aa_ext e = {
 711                 .start = udata,
 712                 .end = udata + size,
 713                 .pos = udata,
 714         };
 715
 716         error = verify_header(&e, ns);
 717         if (error)
 718                 return ERR_PTR(error);
 719
 720         profile = unpack_profile(&e);
 721         if (IS_ERR(profile))
 722                 return profile;
 723
 724         error = verify_profile(profile);
 725         if (error) {
 726                 aa_put_profile(profile);
 727                 profile = ERR_PTR(error);
 728         }
 729
 730         /* return refcount */
 731         return profile;
 732 }