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 see Documentation/admin-guide/LSM/apparmor.rst
  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/cred.h"
  27 #include "include/crypto.h"
  28 #include "include/match.h"
  29 #include "include/path.h"
  30 #include "include/policy.h"
  31 #include "include/policy_unpack.h"
  32
  33 #define K_ABI_MASK 0x3ff
  34 #define FORCE_COMPLAIN_FLAG 0x800
  35 #define VERSION_LT(X, Y) (((X) & K_ABI_MASK) < ((Y) & K_ABI_MASK))
  36 #define VERSION_GT(X, Y) (((X) & K_ABI_MASK) > ((Y) & K_ABI_MASK))
  37
  38 #define v5      5       /* base version */
  39 #define v6      6       /* per entry policydb mediation check */
  40 #define v7      7
  41 #define v8      8       /* full network masking */
  42
  43 /*
  44  * The AppArmor interface treats data as a type byte followed by the
  45  * actual data.  The interface has the notion of a a named entry
  46  * which has a name (AA_NAME typecode followed by name string) followed by
  47  * the entries typecode and data.  Named types allow for optional
  48  * elements and extensions to be added and tested for without breaking
  49  * backwards compatibility.
  50  */
  51
  52 enum aa_code {
  53         AA_U8,
  54         AA_U16,
  55         AA_U32,
  56         AA_U64,
  57         AA_NAME,                /* same as string except it is items name */
  58         AA_STRING,
  59         AA_BLOB,
  60         AA_STRUCT,
  61         AA_STRUCTEND,
  62         AA_LIST,
  63         AA_LISTEND,
  64         AA_ARRAY,
  65         AA_ARRAYEND,
  66 };
  67
  68 /*
  69  * aa_ext is the read of the buffer containing the serialized profile.  The
  70  * data is copied into a kernel buffer in apparmorfs and then handed off to
  71  * the unpack routines.
  72  */
  73 struct aa_ext {
  74         void *start;
  75         void *end;
  76         void *pos;              /* pointer to current position in the buffer */
  77         u32 version;
  78 };
  79
  80 /* audit callback for unpack fields */
  81 static void audit_cb(struct audit_buffer *ab, void *va)
  82 {
  83         struct common_audit_data *sa = va;
  84
  85         if (aad(sa)->iface.ns) {
  86                 audit_log_format(ab, " ns=");
  87                 audit_log_untrustedstring(ab, aad(sa)->iface.ns);
  88         }
  89         if (aad(sa)->name) {
  90                 audit_log_format(ab, " name=");
  91                 audit_log_untrustedstring(ab, aad(sa)->name);
  92         }
  93         if (aad(sa)->iface.pos)
  94                 audit_log_format(ab, " offset=%ld", aad(sa)->iface.pos);
  95 }
  96
  97 /**
  98  * audit_iface - do audit message for policy unpacking/load/replace/remove
  99  * @new: profile if it has been allocated (MAYBE NULL)
 100  * @ns_name: name of the ns the profile is to be loaded to (MAY BE NULL)
 101  * @name: name of the profile being manipulated (MAYBE NULL)
 102  * @info: any extra info about the failure (MAYBE NULL)
 103  * @e: buffer position info
 104  * @error: error code
 105  *
 106  * Returns: %0 or error
 107  */
 108 static int audit_iface(struct aa_profile *new, const char *ns_name,
 109                        const char *name, const char *info, struct aa_ext *e,
 110                        int error)
 111 {
 112         struct aa_profile *profile = labels_profile(aa_current_raw_label());
 113         DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, NULL);
 114         if (e)
 115                 aad(&sa)->iface.pos = e->pos - e->start;
 116         aad(&sa)->iface.ns = ns_name;
 117         if (new)
 118                 aad(&sa)->name = new->base.hname;
 119         else
 120                 aad(&sa)->name = name;
 121         aad(&sa)->info = info;
 122         aad(&sa)->error = error;
 123
 124         return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb);
 125 }
 126
 127 void __aa_loaddata_update(struct aa_loaddata *data, long revision)
 128 {
 129         AA_BUG(!data);
 130         AA_BUG(!data->ns);
 131         AA_BUG(!data->dents[AAFS_LOADDATA_REVISION]);
 132         AA_BUG(!mutex_is_locked(&data->ns->lock));
 133         AA_BUG(data->revision > revision);
 134
 135         data->revision = revision;
 136         d_inode(data->dents[AAFS_LOADDATA_DIR])->i_mtime =
 137                 current_time(d_inode(data->dents[AAFS_LOADDATA_DIR]));
 138         d_inode(data->dents[AAFS_LOADDATA_REVISION])->i_mtime =
 139                 current_time(d_inode(data->dents[AAFS_LOADDATA_REVISION]));
 140 }
 141
 142 bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r)
 143 {
 144         if (l->size != r->size)
 145                 return false;
 146         if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0)
 147                 return false;
 148         return memcmp(l->data, r->data, r->size) == 0;
 149 }
 150
 151 /*
 152  * need to take the ns mutex lock which is NOT safe most places that
 153  * put_loaddata is called, so we have to delay freeing it
 154  */
 155 static void do_loaddata_free(struct work_struct *work)
 156 {
 157         struct aa_loaddata *d = container_of(work, struct aa_loaddata, work);
 158         struct aa_ns *ns = aa_get_ns(d->ns);
 159
 160         if (ns) {
 161                 mutex_lock_nested(&ns->lock, ns->level);
 162                 __aa_fs_remove_rawdata(d);
 163                 mutex_unlock(&ns->lock);
 164                 aa_put_ns(ns);
 165         }
 166
 167         kzfree(d->hash);
 168         kzfree(d->name);
 169         kvfree(d->data);
 170         kzfree(d);
 171 }
 172
 173 void aa_loaddata_kref(struct kref *kref)
 174 {
 175         struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count);
 176
 177         if (d) {
 178                 INIT_WORK(&d->work, do_loaddata_free);
 179                 schedule_work(&d->work);
 180         }
 181 }
 182
 183 struct aa_loaddata *aa_loaddata_alloc(size_t size)
 184 {
 185         struct aa_loaddata *d;
 186
 187         d = kzalloc(sizeof(*d), GFP_KERNEL);
 188         if (d == NULL)
 189                 return ERR_PTR(-ENOMEM);
 190         d->data = kvzalloc(size, GFP_KERNEL);
 191         if (!d->data) {
 192                 kfree(d);
 193                 return ERR_PTR(-ENOMEM);
 194         }
 195         kref_init(&d->count);
 196         INIT_LIST_HEAD(&d->list);
 197
 198         return d;
 199 }
 200
 201 /* test if read will be in packed data bounds */
 202 static bool inbounds(struct aa_ext *e, size_t size)
 203 {
 204         return (size <= e->end - e->pos);
 205 }
 206
 207 static void *kvmemdup(const void *src, size_t len)
 208 {
 209         void *p = kvmalloc(len, GFP_KERNEL);
 210
 211         if (p)
 212                 memcpy(p, src, len);
 213         return p;
 214 }
 215
 216 /**
 217  * aa_u16_chunck - test and do bounds checking for a u16 size based chunk
 218  * @e: serialized data read head (NOT NULL)
 219  * @chunk: start address for chunk of data (NOT NULL)
 220  *
 221  * Returns: the size of chunk found with the read head at the end of the chunk.
 222  */
 223 static size_t unpack_u16_chunk(struct aa_ext *e, char **chunk)
 224 {
 225         size_t size = 0;
 226
 227         if (!inbounds(e, sizeof(u16)))
 228                 return 0;
 229         size = le16_to_cpu(get_unaligned((__le16 *) e->pos));
 230         e->pos += sizeof(__le16);
 231         if (!inbounds(e, size))
 232                 return 0;
 233         *chunk = e->pos;
 234         e->pos += size;
 235         return size;
 236 }
 237
 238 /* unpack control byte */
 239 static bool unpack_X(struct aa_ext *e, enum aa_code code)
 240 {
 241         if (!inbounds(e, 1))
 242                 return 0;
 243         if (*(u8 *) e->pos != code)
 244                 return 0;
 245         e->pos++;
 246         return 1;
 247 }
 248
 249 /**
 250  * unpack_nameX - check is the next element is of type X with a name of @name
 251  * @e: serialized data extent information  (NOT NULL)
 252  * @code: type code
 253  * @name: name to match to the serialized element.  (MAYBE NULL)
 254  *
 255  * check that the next serialized data element is of type X and has a tag
 256  * name @name.  If @name is specified then there must be a matching
 257  * name element in the stream.  If @name is NULL any name element will be
 258  * skipped and only the typecode will be tested.
 259  *
 260  * Returns 1 on success (both type code and name tests match) and the read
 261  * head is advanced past the headers
 262  *
 263  * Returns: 0 if either match fails, the read head does not move
 264  */
 265 static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
 266 {
 267         /*
 268          * May need to reset pos if name or type doesn't match
 269          */
 270         void *pos = e->pos;
 271         /*
 272          * Check for presence of a tagname, and if present name size
 273          * AA_NAME tag value is a u16.
 274          */
 275         if (unpack_X(e, AA_NAME)) {
 276                 char *tag = NULL;
 277                 size_t size = unpack_u16_chunk(e, &tag);
 278                 /* if a name is specified it must match. otherwise skip tag */
 279                 if (name && (!size || strcmp(name, tag)))
 280                         goto fail;
 281         } else if (name) {
 282                 /* if a name is specified and there is no name tag fail */
 283                 goto fail;
 284         }
 285
 286         /* now check if type code matches */
 287         if (unpack_X(e, code))
 288                 return 1;
 289
 290 fail:
 291         e->pos = pos;
 292         return 0;
 293 }
 294
 295 static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
 296 {
 297         if (unpack_nameX(e, AA_U32, name)) {
 298                 if (!inbounds(e, sizeof(u32)))
 299                         return 0;
 300                 if (data)
 301                         *data = le32_to_cpu(get_unaligned((__le32 *) e->pos));
 302                 e->pos += sizeof(u32);
 303                 return 1;
 304         }
 305         return 0;
 306 }
 307
 308 static bool unpack_u64(struct aa_ext *e, u64 *data, const char *name)
 309 {
 310         if (unpack_nameX(e, AA_U64, name)) {
 311                 if (!inbounds(e, sizeof(u64)))
 312                         return 0;
 313                 if (data)
 314                         *data = le64_to_cpu(get_unaligned((__le64 *) e->pos));
 315                 e->pos += sizeof(u64);
 316                 return 1;
 317         }
 318         return 0;
 319 }
 320
 321 static size_t unpack_array(struct aa_ext *e, const char *name)
 322 {
 323         if (unpack_nameX(e, AA_ARRAY, name)) {
 324                 int size;
 325                 if (!inbounds(e, sizeof(u16)))
 326                         return 0;
 327                 size = (int)le16_to_cpu(get_unaligned((__le16 *) e->pos));
 328                 e->pos += sizeof(u16);
 329                 return size;
 330         }
 331         return 0;
 332 }
 333
 334 static size_t unpack_blob(struct aa_ext *e, char **blob, const char *name)
 335 {
 336         if (unpack_nameX(e, AA_BLOB, name)) {
 337                 u32 size;
 338                 if (!inbounds(e, sizeof(u32)))
 339                         return 0;
 340                 size = le32_to_cpu(get_unaligned((__le32 *) e->pos));
 341                 e->pos += sizeof(u32);
 342                 if (inbounds(e, (size_t) size)) {
 343                         *blob = e->pos;
 344                         e->pos += size;
 345                         return size;
 346                 }
 347         }
 348         return 0;
 349 }
 350
 351 static int unpack_str(struct aa_ext *e, const char **string, const char *name)
 352 {
 353         char *src_str;
 354         size_t size = 0;
 355         void *pos = e->pos;
 356         *string = NULL;
 357         if (unpack_nameX(e, AA_STRING, name)) {
 358                 size = unpack_u16_chunk(e, &src_str);
 359                 if (size) {
 360                         /* strings are null terminated, length is size - 1 */
 361                         if (src_str[size - 1] != 0)
 362                                 goto fail;
 363                         *string = src_str;
 364                 }
 365         }
 366         return size;
 367
 368 fail:
 369         e->pos = pos;
 370         return 0;
 371 }
 372
 373 static int unpack_strdup(struct aa_ext *e, char **string, const char *name)
 374 {
 375         const char *tmp;
 376         void *pos = e->pos;
 377         int res = unpack_str(e, &tmp, name);
 378         *string = NULL;
 379
 380         if (!res)
 381                 return 0;
 382
 383         *string = kmemdup(tmp, res, GFP_KERNEL);
 384         if (!*string) {
 385                 e->pos = pos;
 386                 return 0;
 387         }
 388
 389         return res;
 390 }
 391
 392
 393 /**
 394  * unpack_dfa - unpack a file rule dfa
 395  * @e: serialized data extent information (NOT NULL)
 396  *
 397  * returns dfa or ERR_PTR or NULL if no dfa
 398  */
 399 static struct aa_dfa *unpack_dfa(struct aa_ext *e)
 400 {
 401         char *blob = NULL;
 402         size_t size;
 403         struct aa_dfa *dfa = NULL;
 404
 405         size = unpack_blob(e, &blob, "aadfa");
 406         if (size) {
 407                 /*
 408                  * The dfa is aligned with in the blob to 8 bytes
 409                  * from the beginning of the stream.
 410                  * alignment adjust needed by dfa unpack
 411                  */
 412                 size_t sz = blob - (char *) e->start -
 413                         ((e->pos - e->start) & 7);
 414                 size_t pad = ALIGN(sz, 8) - sz;
 415                 int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
 416                         TO_ACCEPT2_FLAG(YYTD_DATA32) | DFA_FLAG_VERIFY_STATES;
 417                 dfa = aa_dfa_unpack(blob + pad, size - pad, flags);
 418
 419                 if (IS_ERR(dfa))
 420                         return dfa;
 421
 422         }
 423
 424         return dfa;
 425 }
 426
 427 /**
 428  * unpack_trans_table - unpack a profile transition table
 429  * @e: serialized data extent information  (NOT NULL)
 430  * @profile: profile to add the accept table to (NOT NULL)
 431  *
 432  * Returns: 1 if table successfully unpacked
 433  */
 434 static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
 435 {
 436         void *saved_pos = e->pos;
 437
 438         /* exec table is optional */
 439         if (unpack_nameX(e, AA_STRUCT, "xtable")) {
 440                 int i, size;
 441
 442                 size = unpack_array(e, NULL);
 443                 /* currently 4 exec bits and entries 0-3 are reserved iupcx */
 444                 if (size > 16 - 4)
 445                         goto fail;
 446                 profile->file.trans.table = kcalloc(size, sizeof(char *),
 447                                                     GFP_KERNEL);
 448                 if (!profile->file.trans.table)
 449                         goto fail;
 450
 451                 profile->file.trans.size = size;
 452                 for (i = 0; i < size; i++) {
 453                         char *str;
 454                         int c, j, pos, size2 = unpack_strdup(e, &str, NULL);
 455                         /* unpack_strdup verifies that the last character is
 456                          * null termination byte.
 457                          */
 458                         if (!size2)
 459                                 goto fail;
 460                         profile->file.trans.table[i] = str;
 461                         /* verify that name doesn't start with space */
 462                         if (isspace(*str))
 463                                 goto fail;
 464
 465                         /* count internal #  of internal \0 */
 466                         for (c = j = 0; j < size2 - 1; j++) {
 467                                 if (!str[j]) {
 468                                         pos = j;
 469                                         c++;
 470                                 }
 471                         }
 472                         if (*str == ':') {
 473                                 /* first character after : must be valid */
 474                                 if (!str[1])
 475                                         goto fail;
 476                                 /* beginning with : requires an embedded \0,
 477                                  * verify that exactly 1 internal \0 exists
 478                                  * trailing \0 already verified by unpack_strdup
 479                                  *
 480                                  * convert \0 back to : for label_parse
 481                                  */
 482                                 if (c == 1)
 483                                         str[pos] = ':';
 484                                 else if (c > 1)
 485                                         goto fail;
 486                         } else if (c)
 487                                 /* fail - all other cases with embedded \0 */
 488                                 goto fail;
 489                 }
 490                 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
 491                         goto fail;
 492                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 493                         goto fail;
 494         }
 495         return 1;
 496
 497 fail:
 498         aa_free_domain_entries(&profile->file.trans);
 499         e->pos = saved_pos;
 500         return 0;
 501 }
 502
 503 static bool unpack_xattrs(struct aa_ext *e, struct aa_profile *profile)
 504 {
 505         void *pos = e->pos;
 506
 507         if (unpack_nameX(e, AA_STRUCT, "xattrs")) {
 508                 int i, size;
 509
 510                 size = unpack_array(e, NULL);
 511                 profile->xattr_count = size;
 512                 profile->xattrs = kcalloc(size, sizeof(char *), GFP_KERNEL);
 513                 if (!profile->xattrs)
 514                         goto fail;
 515                 for (i = 0; i < size; i++) {
 516                         if (!unpack_strdup(e, &profile->xattrs[i], NULL))
 517                                 goto fail;
 518                 }
 519                 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
 520                         goto fail;
 521                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 522                         goto fail;
 523         }
 524
 525         return 1;
 526
 527 fail:
 528         e->pos = pos;
 529         return 0;
 530 }
 531
 532 static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile)
 533 {
 534         void *pos = e->pos;
 535
 536         /* rlimits are optional */
 537         if (unpack_nameX(e, AA_STRUCT, "rlimits")) {
 538                 int i, size;
 539                 u32 tmp = 0;
 540                 if (!unpack_u32(e, &tmp, NULL))
 541                         goto fail;
 542                 profile->rlimits.mask = tmp;
 543
 544                 size = unpack_array(e, NULL);
 545                 if (size > RLIM_NLIMITS)
 546                         goto fail;
 547                 for (i = 0; i < size; i++) {
 548                         u64 tmp2 = 0;
 549                         int a = aa_map_resource(i);
 550                         if (!unpack_u64(e, &tmp2, NULL))
 551                                 goto fail;
 552                         profile->rlimits.limits[a].rlim_max = tmp2;
 553                 }
 554                 if (!unpack_nameX(e, AA_ARRAYEND, NULL))
 555                         goto fail;
 556                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 557                         goto fail;
 558         }
 559         return 1;
 560
 561 fail:
 562         e->pos = pos;
 563         return 0;
 564 }
 565
 566 static u32 strhash(const void *data, u32 len, u32 seed)
 567 {
 568         const char * const *key = data;
 569
 570         return jhash(*key, strlen(*key), seed);
 571 }
 572
 573 static int datacmp(struct rhashtable_compare_arg *arg, const void *obj)
 574 {
 575         const struct aa_data *data = obj;
 576         const char * const *key = arg->key;
 577
 578         return strcmp(data->key, *key);
 579 }
 580
 581 /**
 582  * unpack_profile - unpack a serialized profile
 583  * @e: serialized data extent information (NOT NULL)
 584  *
 585  * NOTE: unpack profile sets audit struct if there is a failure
 586  */
 587 static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
 588 {
 589         struct aa_profile *profile = NULL;
 590         const char *tmpname, *tmpns = NULL, *name = NULL;
 591         const char *info = "failed to unpack profile";
 592         size_t ns_len;
 593         struct rhashtable_params params = { 0 };
 594         char *key = NULL;
 595         struct aa_data *data;
 596         int i, error = -EPROTO;
 597         kernel_cap_t tmpcap;
 598         u32 tmp;
 599
 600         *ns_name = NULL;
 601
 602         /* check that we have the right struct being passed */
 603         if (!unpack_nameX(e, AA_STRUCT, "profile"))
 604                 goto fail;
 605         if (!unpack_str(e, &name, NULL))
 606                 goto fail;
 607         if (*name == '\0')
 608                 goto fail;
 609
 610         tmpname = aa_splitn_fqname(name, strlen(name), &tmpns, &ns_len);
 611         if (tmpns) {
 612                 *ns_name = kstrndup(tmpns, ns_len, GFP_KERNEL);
 613                 if (!*ns_name) {
 614                         info = "out of memory";
 615                         goto fail;
 616                 }
 617                 name = tmpname;
 618         }
 619
 620         profile = aa_alloc_profile(name, NULL, GFP_KERNEL);
 621         if (!profile)
 622                 return ERR_PTR(-ENOMEM);
 623
 624         /* profile renaming is optional */
 625         (void) unpack_str(e, &profile->rename, "rename");
 626
 627         /* attachment string is optional */
 628         (void) unpack_str(e, &profile->attach, "attach");
 629
 630         /* xmatch is optional and may be NULL */
 631         profile->xmatch = unpack_dfa(e);
 632         if (IS_ERR(profile->xmatch)) {
 633                 error = PTR_ERR(profile->xmatch);
 634                 profile->xmatch = NULL;
 635                 info = "bad xmatch";
 636                 goto fail;
 637         }
 638         /* xmatch_len is not optional if xmatch is set */
 639         if (profile->xmatch) {
 640                 if (!unpack_u32(e, &tmp, NULL)) {
 641                         info = "missing xmatch len";
 642                         goto fail;
 643                 }
 644                 profile->xmatch_len = tmp;
 645         }
 646
 647         /* disconnected attachment string is optional */
 648         (void) unpack_str(e, &profile->disconnected, "disconnected");
 649
 650         /* per profile debug flags (complain, audit) */
 651         if (!unpack_nameX(e, AA_STRUCT, "flags")) {
 652                 info = "profile missing flags";
 653                 goto fail;
 654         }
 655         info = "failed to unpack profile flags";
 656         if (!unpack_u32(e, &tmp, NULL))
 657                 goto fail;
 658         if (tmp & PACKED_FLAG_HAT)
 659                 profile->label.flags |= FLAG_HAT;
 660         if (!unpack_u32(e, &tmp, NULL))
 661                 goto fail;
 662         if (tmp == PACKED_MODE_COMPLAIN || (e->version & FORCE_COMPLAIN_FLAG))
 663                 profile->mode = APPARMOR_COMPLAIN;
 664         else if (tmp == PACKED_MODE_KILL)
 665                 profile->mode = APPARMOR_KILL;
 666         else if (tmp == PACKED_MODE_UNCONFINED)
 667                 profile->mode = APPARMOR_UNCONFINED;
 668         if (!unpack_u32(e, &tmp, NULL))
 669                 goto fail;
 670         if (tmp)
 671                 profile->audit = AUDIT_ALL;
 672
 673         if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 674                 goto fail;
 675
 676         /* path_flags is optional */
 677         if (unpack_u32(e, &profile->path_flags, "path_flags"))
 678                 profile->path_flags |= profile->label.flags &
 679                         PATH_MEDIATE_DELETED;
 680         else
 681                 /* set a default value if path_flags field is not present */
 682                 profile->path_flags = PATH_MEDIATE_DELETED;
 683
 684         info = "failed to unpack profile capabilities";
 685         if (!unpack_u32(e, &(profile->caps.allow.cap[0]), NULL))
 686                 goto fail;
 687         if (!unpack_u32(e, &(profile->caps.audit.cap[0]), NULL))
 688                 goto fail;
 689         if (!unpack_u32(e, &(profile->caps.quiet.cap[0]), NULL))
 690                 goto fail;
 691         if (!unpack_u32(e, &tmpcap.cap[0], NULL))
 692                 goto fail;
 693
 694         info = "failed to unpack upper profile capabilities";
 695         if (unpack_nameX(e, AA_STRUCT, "caps64")) {
 696                 /* optional upper half of 64 bit caps */
 697                 if (!unpack_u32(e, &(profile->caps.allow.cap[1]), NULL))
 698                         goto fail;
 699                 if (!unpack_u32(e, &(profile->caps.audit.cap[1]), NULL))
 700                         goto fail;
 701                 if (!unpack_u32(e, &(profile->caps.quiet.cap[1]), NULL))
 702                         goto fail;
 703                 if (!unpack_u32(e, &(tmpcap.cap[1]), NULL))
 704                         goto fail;
 705                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 706                         goto fail;
 707         }
 708
 709         info = "failed to unpack extended profile capabilities";
 710         if (unpack_nameX(e, AA_STRUCT, "capsx")) {
 711                 /* optional extended caps mediation mask */
 712                 if (!unpack_u32(e, &(profile->caps.extended.cap[0]), NULL))
 713                         goto fail;
 714                 if (!unpack_u32(e, &(profile->caps.extended.cap[1]), NULL))
 715                         goto fail;
 716                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 717                         goto fail;
 718         }
 719
 720         if (!unpack_xattrs(e, profile)) {
 721                 info = "failed to unpack profile xattrs";
 722                 goto fail;
 723         }
 724
 725         if (!unpack_rlimits(e, profile)) {
 726                 info = "failed to unpack profile rlimits";
 727                 goto fail;
 728         }
 729
 730         if (unpack_nameX(e, AA_STRUCT, "policydb")) {
 731                 /* generic policy dfa - optional and may be NULL */
 732                 info = "failed to unpack policydb";
 733                 profile->policy.dfa = unpack_dfa(e);
 734                 if (IS_ERR(profile->policy.dfa)) {
 735                         error = PTR_ERR(profile->policy.dfa);
 736                         profile->policy.dfa = NULL;
 737                         goto fail;
 738                 } else if (!profile->policy.dfa) {
 739                         error = -EPROTO;
 740                         goto fail;
 741                 }
 742                 if (!unpack_u32(e, &profile->policy.start[0], "start"))
 743                         /* default start state */
 744                         profile->policy.start[0] = DFA_START;
 745                 /* setup class index */
 746                 for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) {
 747                         profile->policy.start[i] =
 748                                 aa_dfa_next(profile->policy.dfa,
 749                                             profile->policy.start[0],
 750                                             i);
 751                 }
 752                 if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 753                         goto fail;
 754         } else
 755                 profile->policy.dfa = aa_get_dfa(nulldfa);
 756
 757         /* get file rules */
 758         profile->file.dfa = unpack_dfa(e);
 759         if (IS_ERR(profile->file.dfa)) {
 760                 error = PTR_ERR(profile->file.dfa);
 761                 profile->file.dfa = NULL;
 762                 info = "failed to unpack profile file rules";
 763                 goto fail;
 764         } else if (profile->file.dfa) {
 765                 if (!unpack_u32(e, &profile->file.start, "dfa_start"))
 766                         /* default start state */
 767                         profile->file.start = DFA_START;
 768         } else if (profile->policy.dfa &&
 769                    profile->policy.start[AA_CLASS_FILE]) {
 770                 profile->file.dfa = aa_get_dfa(profile->policy.dfa);
 771                 profile->file.start = profile->policy.start[AA_CLASS_FILE];
 772         } else
 773                 profile->file.dfa = aa_get_dfa(nulldfa);
 774
 775         if (!unpack_trans_table(e, profile)) {
 776                 info = "failed to unpack profile transition table";
 777                 goto fail;
 778         }
 779
 780         if (unpack_nameX(e, AA_STRUCT, "data")) {
 781                 info = "out of memory";
 782                 profile->data = kzalloc(sizeof(*profile->data), GFP_KERNEL);
 783                 if (!profile->data)
 784                         goto fail;
 785
 786                 params.nelem_hint = 3;
 787                 params.key_len = sizeof(void *);
 788                 params.key_offset = offsetof(struct aa_data, key);
 789                 params.head_offset = offsetof(struct aa_data, head);
 790                 params.hashfn = strhash;
 791                 params.obj_cmpfn = datacmp;
 792
 793                 if (rhashtable_init(profile->data, &params)) {
 794                         info = "failed to init key, value hash table";
 795                         goto fail;
 796                 }
 797
 798                 while (unpack_strdup(e, &key, NULL)) {
 799                         data = kzalloc(sizeof(*data), GFP_KERNEL);
 800                         if (!data) {
 801                                 kzfree(key);
 802                                 goto fail;
 803                         }
 804
 805                         data->key = key;
 806                         data->size = unpack_blob(e, &data->data, NULL);
 807                         data->data = kvmemdup(data->data, data->size);
 808                         if (data->size && !data->data) {
 809                                 kzfree(data->key);
 810                                 kzfree(data);
 811                                 goto fail;
 812                         }
 813
 814                         rhashtable_insert_fast(profile->data, &data->head,
 815                                                profile->data->p);
 816                 }
 817
 818                 if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
 819                         info = "failed to unpack end of key, value data table";
 820                         goto fail;
 821                 }
 822         }
 823
 824         if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
 825                 info = "failed to unpack end of profile";
 826                 goto fail;
 827         }
 828
 829         return profile;
 830
 831 fail:
 832         if (profile)
 833                 name = NULL;
 834         else if (!name)
 835                 name = "unknown";
 836         audit_iface(profile, NULL, name, info, e, error);
 837         aa_free_profile(profile);
 838
 839         return ERR_PTR(error);
 840 }
 841
 842 /**
 843  * verify_head - unpack serialized stream header
 844  * @e: serialized data read head (NOT NULL)
 845  * @required: whether the header is required or optional
 846  * @ns: Returns - namespace if one is specified else NULL (NOT NULL)
 847  *
 848  * Returns: error or 0 if header is good
 849  */
 850 static int verify_header(struct aa_ext *e, int required, const char **ns)
 851 {
 852         int error = -EPROTONOSUPPORT;
 853         const char *name = NULL;
 854         *ns = NULL;
 855
 856         /* get the interface version */
 857         if (!unpack_u32(e, &e->version, "version")) {
 858                 if (required) {
 859                         audit_iface(NULL, NULL, NULL, "invalid profile format",
 860                                     e, error);
 861                         return error;
 862                 }
 863         }
 864
 865         /* Check that the interface version is currently supported.
 866          * if not specified use previous version
 867          * Mask off everything that is not kernel abi version
 868          */
 869         if (VERSION_LT(e->version, v5) || VERSION_GT(e->version, v7)) {
 870                 audit_iface(NULL, NULL, NULL, "unsupported interface version",
 871                             e, error);
 872                 return error;
 873         }
 874
 875         /* read the namespace if present */
 876         if (unpack_str(e, &name, "namespace")) {
 877                 if (*name == '\0') {
 878                         audit_iface(NULL, NULL, NULL, "invalid namespace name",
 879                                     e, error);
 880                         return error;
 881                 }
 882                 if (*ns && strcmp(*ns, name))
 883                         audit_iface(NULL, NULL, NULL, "invalid ns change", e,
 884                                     error);
 885                 else if (!*ns)
 886                         *ns = name;
 887         }
 888
 889         return 0;
 890 }
 891
 892 static bool verify_xindex(int xindex, int table_size)
 893 {
 894         int index, xtype;
 895         xtype = xindex & AA_X_TYPE_MASK;
 896         index = xindex & AA_X_INDEX_MASK;
 897         if (xtype == AA_X_TABLE && index >= table_size)
 898                 return 0;
 899         return 1;
 900 }
 901
 902 /* verify dfa xindexes are in range of transition tables */
 903 static bool verify_dfa_xindex(struct aa_dfa *dfa, int table_size)
 904 {
 905         int i;
 906         for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
 907                 if (!verify_xindex(dfa_user_xindex(dfa, i), table_size))
 908                         return 0;
 909                 if (!verify_xindex(dfa_other_xindex(dfa, i), table_size))
 910                         return 0;
 911         }
 912         return 1;
 913 }
 914
 915 /**
 916  * verify_profile - Do post unpack analysis to verify profile consistency
 917  * @profile: profile to verify (NOT NULL)
 918  *
 919  * Returns: 0 if passes verification else error
 920  */
 921 static int verify_profile(struct aa_profile *profile)
 922 {
 923         if (profile->file.dfa &&
 924             !verify_dfa_xindex(profile->file.dfa,
 925                                profile->file.trans.size)) {
 926                 audit_iface(profile, NULL, NULL, "Invalid named transition",
 927                             NULL, -EPROTO);
 928                 return -EPROTO;
 929         }
 930
 931         return 0;
 932 }
 933
 934 void aa_load_ent_free(struct aa_load_ent *ent)
 935 {
 936         if (ent) {
 937                 aa_put_profile(ent->rename);
 938                 aa_put_profile(ent->old);
 939                 aa_put_profile(ent->new);
 940                 kfree(ent->ns_name);
 941                 kzfree(ent);
 942         }
 943 }
 944
 945 struct aa_load_ent *aa_load_ent_alloc(void)
 946 {
 947         struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
 948         if (ent)
 949                 INIT_LIST_HEAD(&ent->list);
 950         return ent;
 951 }
 952
 953 /**
 954  * aa_unpack - unpack packed binary profile(s) data loaded from user space
 955  * @udata: user data copied to kmem  (NOT NULL)
 956  * @lh: list to place unpacked profiles in a aa_repl_ws
 957  * @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
 958  *
 959  * Unpack user data and return refcounted allocated profile(s) stored in
 960  * @lh in order of discovery, with the list chain stored in base.list
 961  * or error
 962  *
 963  * Returns: profile(s) on @lh else error pointer if fails to unpack
 964  */
 965 int aa_unpack(struct aa_loaddata *udata, struct list_head *lh,
 966               const char **ns)
 967 {
 968         struct aa_load_ent *tmp, *ent;
 969         struct aa_profile *profile = NULL;
 970         int error;
 971         struct aa_ext e = {
 972                 .start = udata->data,
 973                 .end = udata->data + udata->size,
 974                 .pos = udata->data,
 975         };
 976
 977         *ns = NULL;
 978         while (e.pos < e.end) {
 979                 char *ns_name = NULL;
 980                 void *start;
 981                 error = verify_header(&e, e.pos == e.start, ns);
 982                 if (error)
 983                         goto fail;
 984
 985                 start = e.pos;
 986                 profile = unpack_profile(&e, &ns_name);
 987                 if (IS_ERR(profile)) {
 988                         error = PTR_ERR(profile);
 989                         goto fail;
 990                 }
 991
 992                 error = verify_profile(profile);
 993                 if (error)
 994                         goto fail_profile;
 995
 996                 if (aa_g_hash_policy)
 997                         error = aa_calc_profile_hash(profile, e.version, start,
 998                                                      e.pos - start);
 999                 if (error)
1000                         goto fail_profile;
1001
1002                 ent = aa_load_ent_alloc();
1003                 if (!ent) {
1004                         error = -ENOMEM;
1005                         goto fail_profile;
1006                 }
1007
1008                 ent->new = profile;
1009                 ent->ns_name = ns_name;
1010                 list_add_tail(&ent->list, lh);
1011         }
1012         udata->abi = e.version & K_ABI_MASK;
1013         if (aa_g_hash_policy) {
1014                 udata->hash = aa_calc_hash(udata->data, udata->size);
1015                 if (IS_ERR(udata->hash)) {
1016                         error = PTR_ERR(udata->hash);
1017                         udata->hash = NULL;
1018                         goto fail;
1019                 }
1020         }
1021         return 0;
1022
1023 fail_profile:
1024         aa_put_profile(profile);
1025
1026 fail:
1027         list_for_each_entry_safe(ent, tmp, lh, list) {
1028                 list_del_init(&ent->list);
1029                 aa_load_ent_free(ent);
1030         }
1031
1032         return error;
1033 }