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 2009-2017 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,
 134                        const char *name, const char *src_name,
 135                        const char *type, const char *trans,
 136                        unsigned long flags, const void *data, u32 request,
 137                        struct aa_perms *perms, 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                 .allow = dfa_user_allow(dfa, state),
 221                 .audit = dfa_user_audit(dfa, state),
 222                 .quiet = dfa_user_quiet(dfa, state),
 223                 .xindex = dfa_user_xindex(dfa, state),
 224         };
 225
 226         return perms;
 227 }
 228
 229 static const char * const mnt_info_table[] = {
 230         "match succeeded",
 231         "failed mntpnt match",
 232         "failed srcname match",
 233         "failed type match",
 234         "failed flags match",
 235         "failed data match"
 236 };
 237
 238 /*
 239  * Returns 0 on success else element that match failed in, this is the
 240  * index into the mnt_info_table above
 241  */
 242 static int do_match_mnt(struct aa_dfa *dfa, unsigned int start,
 243                         const char *mntpnt, const char *devname,
 244                         const char *type, unsigned long flags,
 245                         void *data, bool binary, struct aa_perms *perms)
 246 {
 247         unsigned int state;
 248
 249         AA_BUG(!dfa);
 250         AA_BUG(!perms);
 251
 252         state = aa_dfa_match(dfa, start, mntpnt);
 253         state = aa_dfa_null_transition(dfa, state);
 254         if (!state)
 255                 return 1;
 256
 257         if (devname)
 258                 state = aa_dfa_match(dfa, state, devname);
 259         state = aa_dfa_null_transition(dfa, state);
 260         if (!state)
 261                 return 2;
 262
 263         if (type)
 264                 state = aa_dfa_match(dfa, state, type);
 265         state = aa_dfa_null_transition(dfa, state);
 266         if (!state)
 267                 return 3;
 268
 269         state = match_mnt_flags(dfa, state, flags);
 270         if (!state)
 271                 return 4;
 272         *perms = compute_mnt_perms(dfa, state);
 273         if (perms->allow & AA_MAY_MOUNT)
 274                 return 0;
 275
 276         /* only match data if not binary and the DFA flags data is expected */
 277         if (data && !binary && (perms->allow & AA_MNT_CONT_MATCH)) {
 278                 state = aa_dfa_null_transition(dfa, state);
 279                 if (!state)
 280                         return 4;
 281
 282                 state = aa_dfa_match(dfa, state, data);
 283                 if (!state)
 284                         return 5;
 285                 *perms = compute_mnt_perms(dfa, state);
 286                 if (perms->allow & AA_MAY_MOUNT)
 287                         return 0;
 288         }
 289
 290         /* failed at end of flags match */
 291         return 4;
 292 }
 293
 294
 295 static int path_flags(struct aa_profile *profile, const struct path *path)
 296 {
 297         AA_BUG(!profile);
 298         AA_BUG(!path);
 299
 300         return profile->path_flags |
 301                 (S_ISDIR(path->dentry->d_inode->i_mode) ? PATH_IS_DIR : 0);
 302 }
 303
 304 /**
 305  * match_mnt_path_str - handle path matching for mount
 306  * @profile: the confining profile
 307  * @mntpath: for the mntpnt (NOT NULL)
 308  * @buffer: buffer to be used to lookup mntpath
 309  * @devnme: string for the devname/src_name (MAY BE NULL OR ERRPTR)
 310  * @type: string for the dev type (MAYBE NULL)
 311  * @flags: mount flags to match
 312  * @data: fs mount data (MAYBE NULL)
 313  * @binary: whether @data is binary
 314  * @devinfo: error str if (IS_ERR(@devname))
 315  *
 316  * Returns: 0 on success else error
 317  */
 318 static int match_mnt_path_str(struct aa_profile *profile,
 319                               const struct path *mntpath, char *buffer,
 320                               const char *devname, const char *type,
 321                               unsigned long flags, void *data, bool binary,
 322                               const char *devinfo)
 323 {
 324         struct aa_perms perms = { };
 325         const char *mntpnt = NULL, *info = NULL;
 326         int pos, error;
 327
 328         AA_BUG(!profile);
 329         AA_BUG(!mntpath);
 330         AA_BUG(!buffer);
 331
 332         if (!PROFILE_MEDIATES(profile, AA_CLASS_MOUNT))
 333                 return 0;
 334
 335         error = aa_path_name(mntpath, path_flags(profile, mntpath), buffer,
 336                              &mntpnt, &info, profile->disconnected);
 337         if (error)
 338                 goto audit;
 339         if (IS_ERR(devname)) {
 340                 error = PTR_ERR(devname);
 341                 devname = NULL;
 342                 info = devinfo;
 343                 goto audit;
 344         }
 345
 346         error = -EACCES;
 347         pos = do_match_mnt(profile->policy.dfa,
 348                            profile->policy.start[AA_CLASS_MOUNT],
 349                            mntpnt, devname, type, flags, data, binary, &perms);
 350         if (pos) {
 351                 info = mnt_info_table[pos];
 352                 goto audit;
 353         }
 354         error = 0;
 355
 356 audit:
 357         return audit_mount(profile, OP_MOUNT, mntpnt, devname, type, NULL,
 358                            flags, data, AA_MAY_MOUNT, &perms, info, error);
 359 }
 360
 361 /**
 362  * match_mnt - handle path matching for mount
 363  * @profile: the confining profile
 364  * @mntpath: for the mntpnt (NOT NULL)
 365  * @buffer: buffer to be used to lookup mntpath
 366  * @devpath: path devname/src_name (MAYBE NULL)
 367  * @devbuffer: buffer to be used to lookup devname/src_name
 368  * @type: string for the dev type (MAYBE NULL)
 369  * @flags: mount flags to match
 370  * @data: fs mount data (MAYBE NULL)
 371  * @binary: whether @data is binary
 372  *
 373  * Returns: 0 on success else error
 374  */
 375 static int match_mnt(struct aa_profile *profile, const struct path *path,
 376                      char *buffer, struct path *devpath, char *devbuffer,
 377                      const char *type, unsigned long flags, void *data,
 378                      bool binary)
 379 {
 380         const char *devname = NULL, *info = NULL;
 381         int error = -EACCES;
 382
 383         AA_BUG(!profile);
 384         AA_BUG(devpath && !devbuffer);
 385
 386         if (!PROFILE_MEDIATES(profile, AA_CLASS_MOUNT))
 387                 return 0;
 388
 389         if (devpath) {
 390                 error = aa_path_name(devpath, path_flags(profile, devpath),
 391                                      devbuffer, &devname, &info,
 392                                      profile->disconnected);
 393                 if (error)
 394                         devname = ERR_PTR(error);
 395         }
 396
 397         return match_mnt_path_str(profile, path, buffer, devname, type, flags,
 398                                   data, binary, info);
 399 }
 400
 401 int aa_remount(struct aa_label *label, const struct path *path,
 402                unsigned long flags, void *data)
 403 {
 404         struct aa_profile *profile;
 405         char *buffer = NULL;
 406         bool binary;
 407         int error;
 408
 409         AA_BUG(!label);
 410         AA_BUG(!path);
 411
 412         binary = path->dentry->d_sb->s_type->fs_flags & FS_BINARY_MOUNTDATA;
 413
 414         get_buffers(buffer);
 415         error = fn_for_each_confined(label, profile,
 416                         match_mnt(profile, path, buffer, NULL, NULL, NULL,
 417                                   flags, data, binary));
 418         put_buffers(buffer);
 419
 420         return error;
 421 }
 422
 423 int aa_bind_mount(struct aa_label *label, const struct path *path,
 424                   const char *dev_name, unsigned long flags)
 425 {
 426         struct aa_profile *profile;
 427         char *buffer = NULL, *old_buffer = NULL;
 428         struct path old_path;
 429         int error;
 430
 431         AA_BUG(!label);
 432         AA_BUG(!path);
 433
 434         if (!dev_name || !*dev_name)
 435                 return -EINVAL;
 436
 437         flags &= MS_REC | MS_BIND;
 438
 439         error = kern_path(dev_name, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &old_path);
 440         if (error)
 441                 return error;
 442
 443         get_buffers(buffer, old_buffer);
 444         error = fn_for_each_confined(label, profile,
 445                         match_mnt(profile, path, buffer, &old_path, old_buffer,
 446                                   NULL, flags, NULL, false));
 447         put_buffers(buffer, old_buffer);
 448         path_put(&old_path);
 449
 450         return error;
 451 }
 452
 453 int aa_mount_change_type(struct aa_label *label, const struct path *path,
 454                          unsigned long flags)
 455 {
 456         struct aa_profile *profile;
 457         char *buffer = NULL;
 458         int error;
 459
 460         AA_BUG(!label);
 461         AA_BUG(!path);
 462
 463         /* These are the flags allowed by do_change_type() */
 464         flags &= (MS_REC | MS_SILENT | MS_SHARED | MS_PRIVATE | MS_SLAVE |
 465                   MS_UNBINDABLE);
 466
 467         get_buffers(buffer);
 468         error = fn_for_each_confined(label, profile,
 469                         match_mnt(profile, path, buffer, NULL, NULL, NULL,
 470                                   flags, NULL, false));
 471         put_buffers(buffer);
 472
 473         return error;
 474 }
 475
 476 int aa_move_mount(struct aa_label *label, const struct path *path,
 477                   const char *orig_name)
 478 {
 479         struct aa_profile *profile;
 480         char *buffer = NULL, *old_buffer = NULL;
 481         struct path old_path;
 482         int error;
 483
 484         AA_BUG(!label);
 485         AA_BUG(!path);
 486
 487         if (!orig_name || !*orig_name)
 488                 return -EINVAL;
 489
 490         error = kern_path(orig_name, LOOKUP_FOLLOW, &old_path);
 491         if (error)
 492                 return error;
 493
 494         get_buffers(buffer, old_buffer);
 495         error = fn_for_each_confined(label, profile,
 496                         match_mnt(profile, path, buffer, &old_path, old_buffer,
 497                                   NULL, MS_MOVE, NULL, false));
 498         put_buffers(buffer, old_buffer);
 499         path_put(&old_path);
 500
 501         return error;
 502 }
 503
 504 int aa_new_mount(struct aa_label *label, const char *dev_name,
 505                  const struct path *path, const char *type, unsigned long flags,
 506                  void *data)
 507 {
 508         struct aa_profile *profile;
 509         char *buffer = NULL, *dev_buffer = NULL;
 510         bool binary = true;
 511         int error;
 512         int requires_dev = 0;
 513         struct path tmp_path, *dev_path = NULL;
 514
 515         AA_BUG(!label);
 516         AA_BUG(!path);
 517
 518         if (type) {
 519                 struct file_system_type *fstype;
 520
 521                 fstype = get_fs_type(type);
 522                 if (!fstype)
 523                         return -ENODEV;
 524                 binary = fstype->fs_flags & FS_BINARY_MOUNTDATA;
 525                 requires_dev = fstype->fs_flags & FS_REQUIRES_DEV;
 526                 put_filesystem(fstype);
 527
 528                 if (requires_dev) {
 529                         if (!dev_name || !*dev_name)
 530                                 return -ENOENT;
 531
 532                         error = kern_path(dev_name, LOOKUP_FOLLOW, &tmp_path);
 533                         if (error)
 534                                 return error;
 535                         dev_path = &tmp_path;
 536                 }
 537         }
 538
 539         get_buffers(buffer, dev_buffer);
 540         if (dev_path) {
 541                 error = fn_for_each_confined(label, profile,
 542                         match_mnt(profile, path, buffer, dev_path, dev_buffer,
 543                                   type, flags, data, binary));
 544         } else {
 545                 error = fn_for_each_confined(label, profile,
 546                         match_mnt_path_str(profile, path, buffer, dev_name,
 547                                            type, flags, data, binary, NULL));
 548         }
 549         put_buffers(buffer, dev_buffer);
 550         if (dev_path)
 551                 path_put(dev_path);
 552
 553         return error;
 554 }
 555
 556 static int profile_umount(struct aa_profile *profile, struct path *path,
 557                           char *buffer)
 558 {
 559         struct aa_perms perms = { };
 560         const char *name = NULL, *info = NULL;
 561         unsigned int state;
 562         int error;
 563
 564         AA_BUG(!profile);
 565         AA_BUG(!path);
 566
 567         if (!PROFILE_MEDIATES(profile, AA_CLASS_MOUNT))
 568                 return 0;
 569
 570         error = aa_path_name(path, path_flags(profile, path), buffer, &name,
 571                              &info, profile->disconnected);
 572         if (error)
 573                 goto audit;
 574
 575         state = aa_dfa_match(profile->policy.dfa,
 576                              profile->policy.start[AA_CLASS_MOUNT],
 577                              name);
 578         perms = compute_mnt_perms(profile->policy.dfa, state);
 579         if (AA_MAY_UMOUNT & ~perms.allow)
 580                 error = -EACCES;
 581
 582 audit:
 583         return audit_mount(profile, OP_UMOUNT, name, NULL, NULL, NULL, 0, NULL,
 584                            AA_MAY_UMOUNT, &perms, info, error);
 585 }
 586
 587 int aa_umount(struct aa_label *label, struct vfsmount *mnt, int flags)
 588 {
 589         struct aa_profile *profile;
 590         char *buffer = NULL;
 591         int error;
 592         struct path path = { .mnt = mnt, .dentry = mnt->mnt_root };
 593
 594         AA_BUG(!label);
 595         AA_BUG(!mnt);
 596
 597         get_buffers(buffer);
 598         error = fn_for_each_confined(label, profile,
 599                         profile_umount(profile, &path, buffer));
 600         put_buffers(buffer);
 601
 602         return error;
 603 }
 604
 605 /* helper fn for transition on pivotroot
 606  *
 607  * Returns: label for transition or ERR_PTR. Does not return NULL
 608  */
 609 static struct aa_label *build_pivotroot(struct aa_profile *profile,
 610                                         const struct path *new_path,
 611                                         char *new_buffer,
 612                                         const struct path *old_path,
 613                                         char *old_buffer)
 614 {
 615         const char *old_name, *new_name = NULL, *info = NULL;
 616         const char *trans_name = NULL;
 617         struct aa_perms perms = { };
 618         unsigned int state;
 619         int error;
 620
 621         AA_BUG(!profile);
 622         AA_BUG(!new_path);
 623         AA_BUG(!old_path);
 624
 625         if (profile_unconfined(profile) ||
 626             !PROFILE_MEDIATES(profile, AA_CLASS_MOUNT))
 627                 return aa_get_newest_label(&profile->label);
 628
 629         error = aa_path_name(old_path, path_flags(profile, old_path),
 630                              old_buffer, &old_name, &info,
 631                              profile->disconnected);
 632         if (error)
 633                 goto audit;
 634         error = aa_path_name(new_path, path_flags(profile, new_path),
 635                              new_buffer, &new_name, &info,
 636                              profile->disconnected);
 637         if (error)
 638                 goto audit;
 639
 640         error = -EACCES;
 641         state = aa_dfa_match(profile->policy.dfa,
 642                              profile->policy.start[AA_CLASS_MOUNT],
 643                              new_name);
 644         state = aa_dfa_null_transition(profile->policy.dfa, state);
 645         state = aa_dfa_match(profile->policy.dfa, state, old_name);
 646         perms = compute_mnt_perms(profile->policy.dfa, state);
 647
 648         if (AA_MAY_PIVOTROOT & perms.allow)
 649                 error = 0;
 650
 651 audit:
 652         error = audit_mount(profile, OP_PIVOTROOT, new_name, old_name,
 653                             NULL, trans_name, 0, NULL, AA_MAY_PIVOTROOT,
 654                             &perms, info, error);
 655         if (error)
 656                 return ERR_PTR(error);
 657
 658         return aa_get_newest_label(&profile->label);
 659 }
 660
 661 int aa_pivotroot(struct aa_label *label, const struct path *old_path,
 662                  const struct path *new_path)
 663 {
 664         struct aa_profile *profile;
 665         struct aa_label *target = NULL;
 666         char *old_buffer = NULL, *new_buffer = NULL, *info = NULL;
 667         int error;
 668
 669         AA_BUG(!label);
 670         AA_BUG(!old_path);
 671         AA_BUG(!new_path);
 672
 673         get_buffers(old_buffer, new_buffer);
 674         target = fn_label_build(label, profile, GFP_ATOMIC,
 675                         build_pivotroot(profile, new_path, new_buffer,
 676                                         old_path, old_buffer));
 677         if (!target) {
 678                 info = "label build failed";
 679                 error = -ENOMEM;
 680                 goto fail;
 681         } else if (!IS_ERR(target)) {
 682                 error = aa_replace_current_label(target);
 683                 if (error) {
 684                         /* TODO: audit target */
 685                         aa_put_label(target);
 686                         goto out;
 687                 }
 688         } else
 689                 /* already audited error */
 690                 error = PTR_ERR(target);
 691 out:
 692         put_buffers(old_buffer, new_buffer);
 693
 694         return error;
 695
 696 fail:
 697         /* TODO: add back in auditing of new_name and old_name */
 698         error = fn_for_each(label, profile,
 699                         audit_mount(profile, OP_PIVOTROOT, NULL /*new_name */,
 700                                     NULL /* old_name */,
 701                                     NULL, NULL,
 702                                     0, NULL, AA_MAY_PIVOTROOT, &nullperms, info,
 703                                     error));
 704         goto out;
 705 }