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