security/apparmor/mount.c

   1 /*
   2  * AppArmor security module
   3  *
   4  * This file contains AppArmor mediation of files
   5  *
   6  * Copyright (C) 1998-2008 Novell/SUSE
   7  * Copyright 2009-2012 Canonical Ltd.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation, version 2 of the
  12  * License.
  13  */
  14
  15 #include <linux/fs.h>
  16 #include <linux/mount.h>
  17 #include <linux/namei.h>
  18
  19 #include "include/apparmor.h"
  20 #include "include/audit.h"
  21 #include "include/context.h"
  22 #include "include/domain.h"
  23 #include "include/file.h"
  24 #include "include/match.h"
  25 #include "include/mount.h"
  26 #include "include/path.h"
  27 #include "include/policy.h"
  28
  29
  30 static void audit_mnt_flags(struct audit_buffer *ab, unsigned long flags)
  31 {
  32         if (flags & MS_RDONLY)
  33                 audit_log_format(ab, "ro");
  34         else
  35                 audit_log_format(ab, "rw");
  36         if (flags & MS_NOSUID)
  37                 audit_log_format(ab, ", nosuid");
  38         if (flags & MS_NODEV)
  39                 audit_log_format(ab, ", nodev");
  40         if (flags & MS_NOEXEC)
  41                 audit_log_format(ab, ", noexec");
  42         if (flags & MS_SYNCHRONOUS)
  43                 audit_log_format(ab, ", sync");
  44         if (flags & MS_REMOUNT)
  45                 audit_log_format(ab, ", remount");
  46         if (flags & MS_MANDLOCK)
  47                 audit_log_format(ab, ", mand");
  48         if (flags & MS_DIRSYNC)
  49                 audit_log_format(ab, ", dirsync");
  50         if (flags & MS_NOATIME)
  51                 audit_log_format(ab, ", noatime");
  52         if (flags & MS_NODIRATIME)
  53                 audit_log_format(ab, ", nodiratime");
  54         if (flags & MS_BIND)
  55                 audit_log_format(ab, flags & MS_REC ? ", rbind" : ", bind");
  56         if (flags & MS_MOVE)
  57                 audit_log_format(ab, ", move");
  58         if (flags & MS_SILENT)
  59                 audit_log_format(ab, ", silent");
  60         if (flags & MS_POSIXACL)
  61                 audit_log_format(ab, ", acl");
  62         if (flags & MS_UNBINDABLE)
  63                 audit_log_format(ab, flags & MS_REC ? ", runbindable" :
  64                                  ", unbindable");
  65         if (flags & MS_PRIVATE)
  66                 audit_log_format(ab, flags & MS_REC ? ", rprivate" :
  67                                  ", private");
  68         if (flags & MS_SLAVE)
  69                 audit_log_format(ab, flags & MS_REC ? ", rslave" :
  70                                  ", slave");
  71         if (flags & MS_SHARED)
  72                 audit_log_format(ab, flags & MS_REC ? ", rshared" :
  73                                  ", shared");
  74         if (flags & MS_RELATIME)
  75                 audit_log_format(ab, ", relatime");
  76         if (flags & MS_I_VERSION)
  77                 audit_log_format(ab, ", iversion");
  78         if (flags & MS_STRICTATIME)
  79                 audit_log_format(ab, ", strictatime");
  80         if (flags & MS_NOUSER)
  81                 audit_log_format(ab, ", nouser");
  82 }
  83
  84 /**
  85  * audit_cb - call back for mount specific audit fields
  86  * @ab: audit_buffer  (NOT NULL)
  87  * @va: audit struct to audit values of  (NOT NULL)
  88  */
  89 static void audit_cb(struct audit_buffer *ab, void *va)
  90 {
  91         struct common_audit_data *sa = va;
  92
  93         if (aad(sa)->mnt.type) {
  94                 audit_log_format(ab, " fstype=");
  95                 audit_log_untrustedstring(ab, aad(sa)->mnt.type);
  96         }
  97         if (aad(sa)->mnt.src_name) {
  98                 audit_log_format(ab, " srcname=");
  99                 audit_log_untrustedstring(ab, aad(sa)->mnt.src_name);
 100         }
 101         if (aad(sa)->mnt.trans) {
 102                 audit_log_format(ab, " trans=");
 103                 audit_log_untrustedstring(ab, aad(sa)->mnt.trans);
 104         }
 105         if (aad(sa)->mnt.flags) {
 106                 audit_log_format(ab, " flags=\"");
 107                 audit_mnt_flags(ab, aad(sa)->mnt.flags);
 108                 audit_log_format(ab, "\"");
 109         }
 110         if (aad(sa)->mnt.data) {
 111                 audit_log_format(ab, " options=");
 112                 audit_log_untrustedstring(ab, aad(sa)->mnt.data);
 113         }
 114 }
 115
 116 /**
 117  * audit_mount - handle the auditing of mount operations
 118  * @profile: the profile being enforced  (NOT NULL)
 119  * @op: operation being mediated (NOT NULL)
 120  * @name: name of object being mediated (MAYBE NULL)
 121  * @src_name: src_name of object being mediated (MAYBE_NULL)
 122  * @type: type of filesystem (MAYBE_NULL)
 123  * @trans: name of trans (MAYBE NULL)
 124  * @flags: filesystem idependent mount flags
 125  * @data: filesystem mount flags
 126  * @request: permissions requested
 127  * @perms: the permissions computed for the request (NOT NULL)
 128  * @info: extra information message (MAYBE NULL)
 129  * @error: 0 if operation allowed else failure error code
 130  *
 131  * Returns: %0 or error on failure
 132  */
 133 static int audit_mount(struct aa_profile *profile, const char *op, const char *name,
 134                        const char *src_name, const char *type,
 135                        const char *trans, unsigned long flags,
 136                        const void *data, u32 request, struct aa_perms *perms,
 137                        const char *info, int error)
 138 {
 139         int audit_type = AUDIT_APPARMOR_AUTO;
 140         DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, op);
 141
 142         if (likely(!error)) {
 143                 u32 mask = perms->audit;
 144
 145                 if (unlikely(AUDIT_MODE(profile) == AUDIT_ALL))
 146                         mask = 0xffff;
 147
 148                 /* mask off perms that are not being force audited */
 149                 request &= mask;
 150
 151                 if (likely(!request))
 152                         return 0;
 153                 audit_type = AUDIT_APPARMOR_AUDIT;
 154         } else {
 155                 /* only report permissions that were denied */
 156                 request = request & ~perms->allow;
 157
 158                 if (request & perms->kill)
 159                         audit_type = AUDIT_APPARMOR_KILL;
 160
 161                 /* quiet known rejects, assumes quiet and kill do not overlap */
 162                 if ((request & perms->quiet) &&
 163                     AUDIT_MODE(profile) != AUDIT_NOQUIET &&
 164                     AUDIT_MODE(profile) != AUDIT_ALL)
 165                         request &= ~perms->quiet;
 166
 167                 if (!request)
 168                         return error;
 169         }
 170
 171         aad(&sa)->name = name;
 172         aad(&sa)->mnt.src_name = src_name;
 173         aad(&sa)->mnt.type = type;
 174         aad(&sa)->mnt.trans = trans;
 175         aad(&sa)->mnt.flags = flags;
 176         if (data && (perms->audit & AA_AUDIT_DATA))
 177                 aad(&sa)->mnt.data = data;
 178         aad(&sa)->info = info;
 179         aad(&sa)->error = error;
 180
 181         return aa_audit(audit_type, profile, &sa, audit_cb);
 182 }
 183
 184 /**
 185  * match_mnt_flags - Do an ordered match on mount flags
 186  * @dfa: dfa to match against
 187  * @state: state to start in
 188  * @flags: mount flags to match against
 189  *
 190  * Mount flags are encoded as an ordered match. This is done instead of
 191  * checking against a simple bitmask, to allow for logical operations
 192  * on the flags.
 193  *
 194  * Returns: next state after flags match
 195  */
 196 static unsigned int match_mnt_flags(struct aa_dfa *dfa, unsigned int state,
 197                                     unsigned long flags)
 198 {
 199         unsigned int i;
 200
 201         for (i = 0; i <= 31 ; ++i) {
 202                 if ((1 << i) & flags)
 203                         state = aa_dfa_next(dfa, state, i + 1);
 204         }
 205
 206         return state;
 207 }
 208
 209 /**
 210  * compute_mnt_perms - compute mount permission associated with @state
 211  * @dfa: dfa to match against (NOT NULL)
 212  * @state: state match finished in
 213  *
 214  * Returns: mount permissions
 215  */
 216 static struct aa_perms compute_mnt_perms(struct aa_dfa *dfa,
 217                                            unsigned int state)
 218 {
 219         struct aa_perms perms;
 220
 221         perms.kill = 0;
 222         perms.allow = dfa_user_allow(dfa, state);
 223         perms.audit = dfa_user_audit(dfa, state);
 224         perms.quiet = dfa_user_quiet(dfa, state);
 225         perms.xindex = dfa_user_xindex(dfa, state);
 226
 227         return perms;
 228 }
 229
 230 static const char *mnt_info_table[] = {
 231         "match succeeded",
 232         "failed mntpnt match",
 233         "failed srcname match",
 234         "failed type match",
 235         "failed flags match",
 236         "failed data match"
 237 };
 238
 239 /*
 240  * Returns 0 on success else element that match failed in, this is the
 241  * index into the mnt_info_table above
 242  */
 243 static int do_match_mnt(struct aa_dfa *dfa, unsigned int start,
 244                         const char *mntpnt, const char *devname,
 245                         const char *type, unsigned long flags,
 246                         void *data, bool binary, struct aa_perms *perms)
 247 {
 248         unsigned int state;
 249
 250         AA_BUG(!dfa);
 251         AA_BUG(!perms);
 252
 253         state = aa_dfa_match(dfa, start, mntpnt);
 254         state = aa_dfa_null_transition(dfa, state);
 255         if (!state)
 256                 return 1;
 257
 258         if (devname)
 259                 state = aa_dfa_match(dfa, state, devname);
 260         state = aa_dfa_null_transition(dfa, state);
 261         if (!state)
 262                 return 2;
 263
 264         if (type)
 265                 state = aa_dfa_match(dfa, state, type);
 266         state = aa_dfa_null_transition(dfa, state);
 267         if (!state)
 268                 return 3;
 269
 270         state = match_mnt_flags(dfa, state, flags);
 271         if (!state)
 272                 return 4;
 273         *perms = compute_mnt_perms(dfa, state);
 274         if (perms->allow & AA_MAY_MOUNT)
 275                 return 0;
 276
 277         /* only match data if not binary and the DFA flags data is expected */
 278         if (data && !binary && (perms->allow & AA_MNT_CONT_MATCH)) {
 279                 state = aa_dfa_null_transition(dfa, state);
 280                 if (!state)
 281                         return 4;
 282
 283                 state = aa_dfa_match(dfa, state, data);
 284                 if (!state)
 285                         return 5;
 286                 *perms = compute_mnt_perms(dfa, state);
 287                 if (perms->allow & AA_MAY_MOUNT)
 288                         return 0;
 289         }
 290
 291         /* failed at end of flags match */
 292         return 4;
 293 }
 294
 295 /**
 296  * match_mnt - handle path matching for mount
 297  * @profile: the confining profile
 298  * @mntpnt: string for the mntpnt (NOT NULL)
 299  * @devname: string for the devname/src_name (MAYBE NULL)
 300  * @type: string for the dev type (MAYBE NULL)
 301  * @flags: mount flags to match
 302  * @data: fs mount data (MAYBE NULL)
 303  * @binary: whether @data is binary
 304  * @perms: Returns: permission found by the match
 305  * @info: Returns: infomation string about the match for logging
 306  *
 307  * Returns: 0 on success else error
 308  */
 309 static int match_mnt(struct aa_profile *profile, const char *mntpnt,
 310                      const char *devname, const char *type,
 311                      unsigned long flags, void *data, bool binary)
 312 {
 313         struct aa_perms perms = { };
 314         const char *info = NULL;
 315         int pos, error = -EACCES;
 316
 317         AA_BUG(!profile);
 318
 319         pos = do_match_mnt(profile->policy.dfa,
 320                            profile->policy.start[AA_CLASS_MOUNT],
 321                            mntpnt, devname, type, flags, data, binary, &perms);
 322         if (pos) {
 323                 info = mnt_info_table[pos];
 324                 goto audit;
 325         }
 326         error = 0;
 327
 328 audit:
 329         return audit_mount(profile, OP_MOUNT, mntpnt, devname, type, NULL,
 330                            flags, data, AA_MAY_MOUNT, &perms, info, error);
 331 }
 332
 333 static int path_flags(struct aa_profile *profile, struct path *path)
 334 {
 335         AA_BUG(!profile);
 336         AA_BUG(!path);
 337
 338         return profile->path_flags |
 339                 (S_ISDIR(path->dentry->d_inode->i_mode) ? PATH_IS_DIR : 0);
 340 }
 341
 342 int aa_remount(struct aa_label *label, struct path *path, unsigned long flags,
 343                void *data)
 344 {
 345         struct aa_profile *profile;
 346         const char *name, *info = NULL;
 347         char *buffer = NULL;
 348         bool binary;
 349         int error;
 350
 351         AA_BUG(!label);
 352         AA_BUG(!path);
 353
 354         binary = path->dentry->d_sb->s_type->fs_flags & FS_BINARY_MOUNTDATA;
 355
 356         get_buffers(buffer);
 357         error = aa_path_name(path, path_flags(labels_profile(label), path),
 358                              buffer, &name, &info,
 359                              labels_profile(label)->disconnected);
 360         if (error) {
 361                 error = audit_mount(labels_profile(label), OP_MOUNT, name, NULL,
 362                                     NULL, NULL, flags, data, AA_MAY_MOUNT,
 363                                     &nullperms, info, error);
 364                 goto out;
 365         }
 366
 367         error = fn_for_each_confined(label, profile,
 368                         match_mnt(profile, name, NULL, NULL, flags, data,
 369                                   binary));
 370
 371 out:
 372         put_buffers(buffer);
 373
 374         return error;
 375 }
 376
 377 int aa_bind_mount(struct aa_label *label, struct path *path,
 378                   const char *dev_name, unsigned long flags)
 379 {
 380         struct aa_profile *profile;
 381         char *buffer = NULL, *old_buffer = NULL;
 382         const char *name, *old_name = NULL, *info = NULL;
 383         struct path old_path;
 384         int error;
 385
 386         AA_BUG(!label);
 387         AA_BUG(!path);
 388
 389         if (!dev_name || !*dev_name)
 390                 return -EINVAL;
 391
 392         flags &= MS_REC | MS_BIND;
 393
 394         error = kern_path(dev_name, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &old_path);
 395         if (error)
 396                 return error;
 397
 398         get_buffers(buffer, old_buffer);
 399         error = aa_path_name(path, path_flags(labels_profile(label), path), buffer, &name,
 400                              &info, labels_profile(label)->disconnected);
 401         if (error)
 402                 goto error;
 403
 404         error = aa_path_name(&old_path, path_flags(labels_profile(label),
 405                                                    &old_path),
 406                              old_buffer, &old_name, &info,
 407                              labels_profile(label)->disconnected);
 408         path_put(&old_path);
 409         if (error)
 410                 goto error;
 411
 412         error = fn_for_each_confined(label, profile,
 413                         match_mnt(profile, name, old_name, NULL, flags, NULL,
 414                                   false));
 415
 416 out:
 417         put_buffers(buffer, old_buffer);
 418
 419         return error;
 420
 421 error:
 422         error = fn_for_each(label, profile,
 423                         audit_mount(profile, OP_MOUNT, name, old_name, NULL,
 424                                     NULL, flags, NULL, AA_MAY_MOUNT, &nullperms,
 425                                     info, error));
 426         goto out;
 427 }
 428
 429 int aa_mount_change_type(struct aa_label *label, struct path *path,
 430                          unsigned long flags)
 431 {
 432         struct aa_profile *profile;
 433         char *buffer = NULL;
 434         const char *name, *info = NULL;
 435         int error;
 436
 437         AA_BUG(!label);
 438         AA_BUG(!path);
 439
 440         /* These are the flags allowed by do_change_type() */
 441         flags &= (MS_REC | MS_SILENT | MS_SHARED | MS_PRIVATE | MS_SLAVE |
 442                   MS_UNBINDABLE);
 443
 444         get_buffers(buffer);
 445         error = aa_path_name(path, path_flags(labels_profile(label), path),
 446                              buffer, &name, &info,
 447                              labels_profile(label)->disconnected);
 448         if (error) {
 449                 error = fn_for_each(label, profile,
 450                                 audit_mount(profile, OP_MOUNT, name, NULL,
 451                                             NULL, NULL, flags, NULL,
 452                                             AA_MAY_MOUNT, &nullperms, info,
 453                                             error));
 454                 goto out;
 455         }
 456
 457         error = fn_for_each_confined(label, profile,
 458                         match_mnt(profile, name, NULL, NULL, flags, NULL,
 459                                   false));
 460
 461 out:
 462         put_buffers(buffer);
 463
 464         return error;
 465 }
 466
 467 int aa_move_mount(struct aa_label *label, struct path *path,
 468                   const char *orig_name)
 469 {
 470         struct aa_profile *profile;
 471         char *buffer = NULL, *old_buffer = NULL;
 472         const char *name, *old_name = NULL, *info = NULL;
 473         struct path old_path;
 474         int error;
 475
 476         AA_BUG(!label);
 477         AA_BUG(!path);
 478
 479         if (!orig_name || !*orig_name)
 480                 return -EINVAL;
 481
 482         error = kern_path(orig_name, LOOKUP_FOLLOW, &old_path);
 483         if (error)
 484                 return error;
 485
 486         get_buffers(buffer, old_buffer);
 487         error = aa_path_name(path, path_flags(labels_profile(label), path),
 488                              buffer, &name, &info,
 489                              labels_profile(label)->disconnected);
 490         if (error)
 491                 goto error;
 492
 493         error = aa_path_name(&old_path, path_flags(labels_profile(label),
 494                                                    &old_path),
 495                              old_buffer, &old_name, &info,
 496                              labels_profile(label)->disconnected);
 497         path_put(&old_path);
 498         if (error)
 499                 goto error;
 500
 501         error = fn_for_each_confined(label, profile,
 502                         match_mnt(profile, name, old_name, NULL, MS_MOVE, NULL,
 503                                   false));
 504
 505 out:
 506         put_buffers(buffer, old_buffer);
 507
 508         return error;
 509
 510 error:
 511         error = fn_for_each(label, profile,
 512                         audit_mount(profile, OP_MOUNT, name, old_name, NULL,
 513                                     NULL, MS_MOVE, NULL, AA_MAY_MOUNT,
 514                                     &nullperms, info, error));
 515         goto out;
 516 }
 517
 518 int aa_new_mount(struct aa_label *label, const char *orig_dev_name,
 519                  struct path *path, const char *type, unsigned long flags,
 520                  void *data)
 521 {
 522         struct aa_profile *profile;
 523         char *buffer = NULL, *dev_buffer = NULL;
 524         const char *name = NULL, *dev_name = NULL, *info = NULL;
 525         bool binary = true;
 526         int error;
 527         int requires_dev = 0;
 528         struct path dev_path;
 529
 530         AA_BUG(!label);
 531         AA_BUG(!path);
 532
 533         dev_name = orig_dev_name;
 534         if (type) {
 535                 struct file_system_type *fstype;
 536                 fstype = get_fs_type(type);
 537                 if (!fstype)
 538                         return -ENODEV;
 539                 binary = fstype->fs_flags & FS_BINARY_MOUNTDATA;
 540                 requires_dev = fstype->fs_flags & FS_REQUIRES_DEV;
 541                 put_filesystem(fstype);
 542
 543                 if (requires_dev) {
 544                         if (!dev_name || !*dev_name)
 545                                 return -ENOENT;
 546
 547                         error = kern_path(dev_name, LOOKUP_FOLLOW, &dev_path);
 548                         if (error)
 549                                 return error;
 550                 }
 551         }
 552
 553         get_buffers(buffer, dev_buffer);
 554         if (type && requires_dev) {
 555                 error = aa_path_name(&dev_path,
 556                                      path_flags(labels_profile(label),
 557                                                 &dev_path),
 558                                      dev_buffer, &dev_name, &info,
 559                                      labels_profile(label)->disconnected);
 560                 path_put(&dev_path);
 561                 if (error)
 562                         goto error;
 563         }
 564
 565         error = aa_path_name(path, path_flags(labels_profile(label), path),
 566                              buffer, &name, &info,
 567                              labels_profile(label)->disconnected);
 568         if (error)
 569                 goto error;
 570
 571         error = fn_for_each_confined(label, profile,
 572                         match_mnt(profile, name, dev_name, type, flags, data,
 573                                   binary));
 574
 575 cleanup:
 576         put_buffers(buffer, dev_buffer);
 577
 578         return error;
 579
 580 error:
 581         error = fn_for_each(label, profile,
 582                         audit_mount(labels_profile(label), OP_MOUNT, name,
 583                                     dev_name, type, NULL, flags, data,
 584                                     AA_MAY_MOUNT, &nullperms, info, error));
 585         goto cleanup;
 586 }
 587
 588 static int profile_umount(struct aa_profile *profile, const char *name)
 589 {
 590         struct aa_perms perms = { };
 591         const char *info = NULL;
 592         unsigned int state;
 593         int e = 0;
 594
 595         AA_BUG(!profile);
 596         AA_BUG(!name);
 597
 598         state = aa_dfa_match(profile->policy.dfa,
 599                              profile->policy.start[AA_CLASS_MOUNT],
 600                              name);
 601         perms = compute_mnt_perms(profile->policy.dfa, state);
 602         if (AA_MAY_UMOUNT & ~perms.allow)
 603                 e = -EACCES;
 604
 605         return audit_mount(profile, OP_UMOUNT, name, NULL, NULL, NULL, 0, NULL,
 606                            AA_MAY_UMOUNT, &perms, info, e);
 607 }
 608
 609 int aa_umount(struct aa_label *label, struct vfsmount *mnt, int flags)
 610 {
 611         struct aa_profile *profile;
 612         char *buffer = NULL;
 613         const char *name, *info = NULL;
 614         int error;
 615         struct path path = { mnt, mnt->mnt_root };
 616
 617         AA_BUG(!label);
 618         AA_BUG(!mnt);
 619
 620         get_buffers(buffer);
 621         error = aa_path_name(&path, path_flags(labels_profile(label), &path),
 622                              buffer, &name, &info,
 623                              labels_profile(label)->disconnected);
 624         if (error) {
 625                 error = fn_for_each(label, profile,
 626                                 audit_mount(profile, OP_UMOUNT, name, NULL,
 627                                             NULL, NULL, 0, NULL, AA_MAY_UMOUNT,
 628                                             &nullperms, info, error));
 629                 goto out;
 630         }
 631
 632         error = fn_for_each_confined(label, profile,
 633                         profile_umount(profile, name));
 634
 635 out:
 636         put_buffers(buffer);
 637
 638         return error;
 639 }
 640
 641 static int profile_pivotroot(struct aa_profile *profile, const char *new_name,
 642                              const char *old_name, struct aa_label **trans)
 643 {
 644         struct aa_label *target = NULL;
 645         const char *trans_name = NULL;
 646         struct aa_perms perms = { };
 647         const char *info = NULL;
 648         unsigned int state;
 649         int error = -EACCES;
 650
 651         AA_BUG(!profile);
 652         AA_BUG(!new_name);
 653         AA_BUG(!old_name);
 654         AA_BUG(!trans);
 655
 656         /* TODO: actual domain transition computation for multiple
 657          *  profiles
 658          */
 659         state = aa_dfa_match(profile->policy.dfa,
 660                              profile->policy.start[AA_CLASS_MOUNT],
 661                              new_name);
 662         state = aa_dfa_null_transition(profile->policy.dfa, state);
 663         state = aa_dfa_match(profile->policy.dfa, state, old_name);
 664         perms = compute_mnt_perms(profile->policy.dfa, state);
 665
 666         if (AA_MAY_PIVOTROOT & perms.allow) {
 667                 if ((perms.xindex & AA_X_TYPE_MASK) == AA_X_TABLE) {
 668                         target = x_table_lookup(profile, perms.xindex,
 669                                                 &trans_name);
 670                         if (!target)
 671                                 error = -ENOENT;
 672                         else
 673                                 *trans = target;
 674                 } else
 675                         error = 0;
 676         }
 677
 678         error = audit_mount(profile, OP_PIVOTROOT, new_name, old_name,
 679                             NULL, trans_name, 0, NULL, AA_MAY_PIVOTROOT,
 680                             &perms, info, error);
 681         if (!*trans)
 682                 aa_put_label(target);
 683
 684         return error;
 685 }
 686
 687 int aa_pivotroot(struct aa_label *label, struct path *old_path,
 688                   struct path *new_path)
 689 {
 690         struct aa_profile *profile;
 691         struct aa_label *target = NULL;
 692         char *old_buffer = NULL, *new_buffer = NULL;
 693         const char *old_name, *new_name = NULL, *info = NULL;
 694         int error;
 695
 696         AA_BUG(!label);
 697         AA_BUG(!old_path);
 698         AA_BUG(!new_path);
 699
 700         get_buffers(old_buffer, new_buffer);
 701         error = aa_path_name(old_path, path_flags(labels_profile(label),
 702                                                   old_path),
 703                              old_buffer, &old_name, &info,
 704                              labels_profile(label)->disconnected);
 705         if (error)
 706                 goto error;
 707         error = aa_path_name(new_path, path_flags(labels_profile(label),
 708                                                   new_path),
 709                              new_buffer, &new_name, &info,
 710                              labels_profile(label)->disconnected);
 711         if (error)
 712                 goto error;
 713         error = fn_for_each(label, profile,
 714                         profile_pivotroot(profile, new_name, old_name,
 715                                           &target));
 716 out:
 717         put_buffers(old_buffer, new_buffer);
 718
 719         if (target)
 720                 error = aa_replace_current_label(target);
 721
 722         return error;
 723
 724 error:
 725         error = fn_for_each(label, profile,
 726                         audit_mount(profile, OP_PIVOTROOT, new_name, old_name,
 727                                     NULL, NULL,
 728                                     0, NULL, AA_MAY_PIVOTROOT, &nullperms, info,
 729                                     error));
 730         goto out;
 731 }