security/selinux/selinuxfs.c

   1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
   2  *
   3  *      Added conditional policy language extensions
   4  *
   5  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
   6  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation, version 2.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/slab.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/fs.h>
  17 #include <linux/mutex.h>
  18 #include <linux/init.h>
  19 #include <linux/string.h>
  20 #include <linux/security.h>
  21 #include <linux/major.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/percpu.h>
  24 #include <linux/audit.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/semaphore.h>
  27
  28 /* selinuxfs pseudo filesystem for exporting the security policy API.
  29    Based on the proc code and the fs/nfsd/nfsctl.c code. */
  30
  31 #include "flask.h"
  32 #include "avc.h"
  33 #include "avc_ss.h"
  34 #include "security.h"
  35 #include "objsec.h"
  36 #include "conditional.h"
  37
  38 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
  39
  40 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
  41 #define SELINUX_COMPAT_NET_VALUE 0
  42 #else
  43 #define SELINUX_COMPAT_NET_VALUE 1
  44 #endif
  45
  46 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
  47
  48 static int __init checkreqprot_setup(char *str)
  49 {
  50         selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
  51         return 1;
  52 }
  53 __setup("checkreqprot=", checkreqprot_setup);
  54
  55 static int __init selinux_compat_net_setup(char *str)
  56 {
  57         selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
  58         return 1;
  59 }
  60 __setup("selinux_compat_net=", selinux_compat_net_setup);
  61
  62
  63 static DEFINE_MUTEX(sel_mutex);
  64
  65 /* global data for booleans */
  66 static struct dentry *bool_dir = NULL;
  67 static int bool_num = 0;
  68 static int *bool_pending_values = NULL;
  69
  70 extern void selnl_notify_setenforce(int val);
  71
  72 /* Check whether a task is allowed to use a security operation. */
  73 static int task_has_security(struct task_struct *tsk,
  74                              u32 perms)
  75 {
  76         struct task_security_struct *tsec;
  77
  78         tsec = tsk->security;
  79         if (!tsec)
  80                 return -EACCES;
  81
  82         return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
  83                             SECCLASS_SECURITY, perms, NULL);
  84 }
  85
  86 enum sel_inos {
  87         SEL_ROOT_INO = 2,
  88         SEL_LOAD,       /* load policy */
  89         SEL_ENFORCE,    /* get or set enforcing status */
  90         SEL_CONTEXT,    /* validate context */
  91         SEL_ACCESS,     /* compute access decision */
  92         SEL_CREATE,     /* compute create labeling decision */
  93         SEL_RELABEL,    /* compute relabeling decision */
  94         SEL_USER,       /* compute reachable user contexts */
  95         SEL_POLICYVERS, /* return policy version for this kernel */
  96         SEL_COMMIT_BOOLS, /* commit new boolean values */
  97         SEL_MLS,        /* return if MLS policy is enabled */
  98         SEL_DISABLE,    /* disable SELinux until next reboot */
  99         SEL_AVC,        /* AVC management directory */
 100         SEL_MEMBER,     /* compute polyinstantiation membership decision */
 101         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 102         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
 103 };
 104
 105 #define SEL_INITCON_INO_OFFSET  0x01000000
 106 #define SEL_INO_MASK            0x00ffffff
 107
 108 #define TMPBUFLEN       12
 109 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 110                                 size_t count, loff_t *ppos)
 111 {
 112         char tmpbuf[TMPBUFLEN];
 113         ssize_t length;
 114
 115         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 116         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 117 }
 118
 119 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 120 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
 121                                  size_t count, loff_t *ppos)
 122
 123 {
 124         char *page;
 125         ssize_t length;
 126         int new_value;
 127
 128         if (count >= PAGE_SIZE)
 129                 return -ENOMEM;
 130         if (*ppos != 0) {
 131                 /* No partial writes. */
 132                 return -EINVAL;
 133         }
 134         page = (char*)get_zeroed_page(GFP_KERNEL);
 135         if (!page)
 136                 return -ENOMEM;
 137         length = -EFAULT;
 138         if (copy_from_user(page, buf, count))
 139                 goto out;
 140
 141         length = -EINVAL;
 142         if (sscanf(page, "%d", &new_value) != 1)
 143                 goto out;
 144
 145         if (new_value != selinux_enforcing) {
 146                 length = task_has_security(current, SECURITY__SETENFORCE);
 147                 if (length)
 148                         goto out;
 149                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 150                         "enforcing=%d old_enforcing=%d auid=%u", new_value,
 151                         selinux_enforcing,
 152                         audit_get_loginuid(current->audit_context));
 153                 selinux_enforcing = new_value;
 154                 if (selinux_enforcing)
 155                         avc_ss_reset(0);
 156                 selnl_notify_setenforce(selinux_enforcing);
 157         }
 158         length = count;
 159 out:
 160         free_page((unsigned long) page);
 161         return length;
 162 }
 163 #else
 164 #define sel_write_enforce NULL
 165 #endif
 166
 167 static const struct file_operations sel_enforce_ops = {
 168         .read           = sel_read_enforce,
 169         .write          = sel_write_enforce,
 170 };
 171
 172 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 173 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
 174                                  size_t count, loff_t *ppos)
 175
 176 {
 177         char *page;
 178         ssize_t length;
 179         int new_value;
 180         extern int selinux_disable(void);
 181
 182         if (count >= PAGE_SIZE)
 183                 return -ENOMEM;
 184         if (*ppos != 0) {
 185                 /* No partial writes. */
 186                 return -EINVAL;
 187         }
 188         page = (char*)get_zeroed_page(GFP_KERNEL);
 189         if (!page)
 190                 return -ENOMEM;
 191         length = -EFAULT;
 192         if (copy_from_user(page, buf, count))
 193                 goto out;
 194
 195         length = -EINVAL;
 196         if (sscanf(page, "%d", &new_value) != 1)
 197                 goto out;
 198
 199         if (new_value) {
 200                 length = selinux_disable();
 201                 if (length < 0)
 202                         goto out;
 203                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 204                         "selinux=0 auid=%u",
 205                         audit_get_loginuid(current->audit_context));
 206         }
 207
 208         length = count;
 209 out:
 210         free_page((unsigned long) page);
 211         return length;
 212 }
 213 #else
 214 #define sel_write_disable NULL
 215 #endif
 216
 217 static const struct file_operations sel_disable_ops = {
 218         .write          = sel_write_disable,
 219 };
 220
 221 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 222                                    size_t count, loff_t *ppos)
 223 {
 224         char tmpbuf[TMPBUFLEN];
 225         ssize_t length;
 226
 227         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 228         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 229 }
 230
 231 static const struct file_operations sel_policyvers_ops = {
 232         .read           = sel_read_policyvers,
 233 };
 234
 235 /* declaration for sel_write_load */
 236 static int sel_make_bools(void);
 237
 238 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 239                                 size_t count, loff_t *ppos)
 240 {
 241         char tmpbuf[TMPBUFLEN];
 242         ssize_t length;
 243
 244         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
 245         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 246 }
 247
 248 static const struct file_operations sel_mls_ops = {
 249         .read           = sel_read_mls,
 250 };
 251
 252 static ssize_t sel_write_load(struct file * file, const char __user * buf,
 253                               size_t count, loff_t *ppos)
 254
 255 {
 256         int ret;
 257         ssize_t length;
 258         void *data = NULL;
 259
 260         mutex_lock(&sel_mutex);
 261
 262         length = task_has_security(current, SECURITY__LOAD_POLICY);
 263         if (length)
 264                 goto out;
 265
 266         if (*ppos != 0) {
 267                 /* No partial writes. */
 268                 length = -EINVAL;
 269                 goto out;
 270         }
 271
 272         if ((count > 64 * 1024 * 1024)
 273             || (data = vmalloc(count)) == NULL) {
 274                 length = -ENOMEM;
 275                 goto out;
 276         }
 277
 278         length = -EFAULT;
 279         if (copy_from_user(data, buf, count) != 0)
 280                 goto out;
 281
 282         length = security_load_policy(data, count);
 283         if (length)
 284                 goto out;
 285
 286         ret = sel_make_bools();
 287         if (ret)
 288                 length = ret;
 289         else
 290                 length = count;
 291         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 292                 "policy loaded auid=%u",
 293                 audit_get_loginuid(current->audit_context));
 294 out:
 295         mutex_unlock(&sel_mutex);
 296         vfree(data);
 297         return length;
 298 }
 299
 300 static const struct file_operations sel_load_ops = {
 301         .write          = sel_write_load,
 302 };
 303
 304 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
 305 {
 306         char *canon;
 307         u32 sid, len;
 308         ssize_t length;
 309
 310         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 311         if (length)
 312                 return length;
 313
 314         length = security_context_to_sid(buf, size, &sid);
 315         if (length < 0)
 316                 return length;
 317
 318         length = security_sid_to_context(sid, &canon, &len);
 319         if (length < 0)
 320                 return length;
 321
 322         if (len > SIMPLE_TRANSACTION_LIMIT) {
 323                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 324                        "max\n", __FUNCTION__, len);
 325                 length = -ERANGE;
 326                 goto out;
 327         }
 328
 329         memcpy(buf, canon, len);
 330         length = len;
 331 out:
 332         kfree(canon);
 333         return length;
 334 }
 335
 336 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 337                                      size_t count, loff_t *ppos)
 338 {
 339         char tmpbuf[TMPBUFLEN];
 340         ssize_t length;
 341
 342         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 343         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 344 }
 345
 346 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
 347                                       size_t count, loff_t *ppos)
 348 {
 349         char *page;
 350         ssize_t length;
 351         unsigned int new_value;
 352
 353         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 354         if (length)
 355                 return length;
 356
 357         if (count >= PAGE_SIZE)
 358                 return -ENOMEM;
 359         if (*ppos != 0) {
 360                 /* No partial writes. */
 361                 return -EINVAL;
 362         }
 363         page = (char*)get_zeroed_page(GFP_KERNEL);
 364         if (!page)
 365                 return -ENOMEM;
 366         length = -EFAULT;
 367         if (copy_from_user(page, buf, count))
 368                 goto out;
 369
 370         length = -EINVAL;
 371         if (sscanf(page, "%u", &new_value) != 1)
 372                 goto out;
 373
 374         selinux_checkreqprot = new_value ? 1 : 0;
 375         length = count;
 376 out:
 377         free_page((unsigned long) page);
 378         return length;
 379 }
 380 static const struct file_operations sel_checkreqprot_ops = {
 381         .read           = sel_read_checkreqprot,
 382         .write          = sel_write_checkreqprot,
 383 };
 384
 385 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
 386                                    size_t count, loff_t *ppos)
 387 {
 388         char tmpbuf[TMPBUFLEN];
 389         ssize_t length;
 390
 391         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
 392         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 393 }
 394
 395 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
 396                                     size_t count, loff_t *ppos)
 397 {
 398         char *page;
 399         ssize_t length;
 400         int new_value;
 401
 402         length = task_has_security(current, SECURITY__LOAD_POLICY);
 403         if (length)
 404                 return length;
 405
 406         if (count >= PAGE_SIZE)
 407                 return -ENOMEM;
 408         if (*ppos != 0) {
 409                 /* No partial writes. */
 410                 return -EINVAL;
 411         }
 412         page = (char*)get_zeroed_page(GFP_KERNEL);
 413         if (!page)
 414                 return -ENOMEM;
 415         length = -EFAULT;
 416         if (copy_from_user(page, buf, count))
 417                 goto out;
 418
 419         length = -EINVAL;
 420         if (sscanf(page, "%d", &new_value) != 1)
 421                 goto out;
 422
 423         selinux_compat_net = new_value ? 1 : 0;
 424         length = count;
 425 out:
 426         free_page((unsigned long) page);
 427         return length;
 428 }
 429 static const struct file_operations sel_compat_net_ops = {
 430         .read           = sel_read_compat_net,
 431         .write          = sel_write_compat_net,
 432 };
 433
 434 /*
 435  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 436  */
 437 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
 438 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
 439 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
 440 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
 441 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
 442
 443 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 444         [SEL_ACCESS] = sel_write_access,
 445         [SEL_CREATE] = sel_write_create,
 446         [SEL_RELABEL] = sel_write_relabel,
 447         [SEL_USER] = sel_write_user,
 448         [SEL_MEMBER] = sel_write_member,
 449         [SEL_CONTEXT] = sel_write_context,
 450 };
 451
 452 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 453 {
 454         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 455         char *data;
 456         ssize_t rv;
 457
 458         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 459                 return -EINVAL;
 460
 461         data = simple_transaction_get(file, buf, size);
 462         if (IS_ERR(data))
 463                 return PTR_ERR(data);
 464
 465         rv =  write_op[ino](file, data, size);
 466         if (rv>0) {
 467                 simple_transaction_set(file, rv);
 468                 rv = size;
 469         }
 470         return rv;
 471 }
 472
 473 static const struct file_operations transaction_ops = {
 474         .write          = selinux_transaction_write,
 475         .read           = simple_transaction_read,
 476         .release        = simple_transaction_release,
 477 };
 478
 479 /*
 480  * payload - write methods
 481  * If the method has a response, the response should be put in buf,
 482  * and the length returned.  Otherwise return 0 or and -error.
 483  */
 484
 485 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
 486 {
 487         char *scon, *tcon;
 488         u32 ssid, tsid;
 489         u16 tclass;
 490         u32 req;
 491         struct av_decision avd;
 492         ssize_t length;
 493
 494         length = task_has_security(current, SECURITY__COMPUTE_AV);
 495         if (length)
 496                 return length;
 497
 498         length = -ENOMEM;
 499         scon = kzalloc(size+1, GFP_KERNEL);
 500         if (!scon)
 501                 return length;
 502
 503         tcon = kzalloc(size+1, GFP_KERNEL);
 504         if (!tcon)
 505                 goto out;
 506
 507         length = -EINVAL;
 508         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
 509                 goto out2;
 510
 511         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 512         if (length < 0)
 513                 goto out2;
 514         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 515         if (length < 0)
 516                 goto out2;
 517
 518         length = security_compute_av(ssid, tsid, tclass, req, &avd);
 519         if (length < 0)
 520                 goto out2;
 521
 522         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 523                           "%x %x %x %x %u",
 524                           avd.allowed, avd.decided,
 525                           avd.auditallow, avd.auditdeny,
 526                           avd.seqno);
 527 out2:
 528         kfree(tcon);
 529 out:
 530         kfree(scon);
 531         return length;
 532 }
 533
 534 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
 535 {
 536         char *scon, *tcon;
 537         u32 ssid, tsid, newsid;
 538         u16 tclass;
 539         ssize_t length;
 540         char *newcon;
 541         u32 len;
 542
 543         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 544         if (length)
 545                 return length;
 546
 547         length = -ENOMEM;
 548         scon = kzalloc(size+1, GFP_KERNEL);
 549         if (!scon)
 550                 return length;
 551
 552         tcon = kzalloc(size+1, GFP_KERNEL);
 553         if (!tcon)
 554                 goto out;
 555
 556         length = -EINVAL;
 557         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 558                 goto out2;
 559
 560         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 561         if (length < 0)
 562                 goto out2;
 563         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 564         if (length < 0)
 565                 goto out2;
 566
 567         length = security_transition_sid(ssid, tsid, tclass, &newsid);
 568         if (length < 0)
 569                 goto out2;
 570
 571         length = security_sid_to_context(newsid, &newcon, &len);
 572         if (length < 0)
 573                 goto out2;
 574
 575         if (len > SIMPLE_TRANSACTION_LIMIT) {
 576                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 577                        "max\n", __FUNCTION__, len);
 578                 length = -ERANGE;
 579                 goto out3;
 580         }
 581
 582         memcpy(buf, newcon, len);
 583         length = len;
 584 out3:
 585         kfree(newcon);
 586 out2:
 587         kfree(tcon);
 588 out:
 589         kfree(scon);
 590         return length;
 591 }
 592
 593 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
 594 {
 595         char *scon, *tcon;
 596         u32 ssid, tsid, newsid;
 597         u16 tclass;
 598         ssize_t length;
 599         char *newcon;
 600         u32 len;
 601
 602         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 603         if (length)
 604                 return length;
 605
 606         length = -ENOMEM;
 607         scon = kzalloc(size+1, GFP_KERNEL);
 608         if (!scon)
 609                 return length;
 610
 611         tcon = kzalloc(size+1, GFP_KERNEL);
 612         if (!tcon)
 613                 goto out;
 614
 615         length = -EINVAL;
 616         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 617                 goto out2;
 618
 619         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 620         if (length < 0)
 621                 goto out2;
 622         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 623         if (length < 0)
 624                 goto out2;
 625
 626         length = security_change_sid(ssid, tsid, tclass, &newsid);
 627         if (length < 0)
 628                 goto out2;
 629
 630         length = security_sid_to_context(newsid, &newcon, &len);
 631         if (length < 0)
 632                 goto out2;
 633
 634         if (len > SIMPLE_TRANSACTION_LIMIT) {
 635                 length = -ERANGE;
 636                 goto out3;
 637         }
 638
 639         memcpy(buf, newcon, len);
 640         length = len;
 641 out3:
 642         kfree(newcon);
 643 out2:
 644         kfree(tcon);
 645 out:
 646         kfree(scon);
 647         return length;
 648 }
 649
 650 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
 651 {
 652         char *con, *user, *ptr;
 653         u32 sid, *sids;
 654         ssize_t length;
 655         char *newcon;
 656         int i, rc;
 657         u32 len, nsids;
 658
 659         length = task_has_security(current, SECURITY__COMPUTE_USER);
 660         if (length)
 661                 return length;
 662
 663         length = -ENOMEM;
 664         con = kzalloc(size+1, GFP_KERNEL);
 665         if (!con)
 666                 return length;
 667
 668         user = kzalloc(size+1, GFP_KERNEL);
 669         if (!user)
 670                 goto out;
 671
 672         length = -EINVAL;
 673         if (sscanf(buf, "%s %s", con, user) != 2)
 674                 goto out2;
 675
 676         length = security_context_to_sid(con, strlen(con)+1, &sid);
 677         if (length < 0)
 678                 goto out2;
 679
 680         length = security_get_user_sids(sid, user, &sids, &nsids);
 681         if (length < 0)
 682                 goto out2;
 683
 684         length = sprintf(buf, "%u", nsids) + 1;
 685         ptr = buf + length;
 686         for (i = 0; i < nsids; i++) {
 687                 rc = security_sid_to_context(sids[i], &newcon, &len);
 688                 if (rc) {
 689                         length = rc;
 690                         goto out3;
 691                 }
 692                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 693                         kfree(newcon);
 694                         length = -ERANGE;
 695                         goto out3;
 696                 }
 697                 memcpy(ptr, newcon, len);
 698                 kfree(newcon);
 699                 ptr += len;
 700                 length += len;
 701         }
 702 out3:
 703         kfree(sids);
 704 out2:
 705         kfree(user);
 706 out:
 707         kfree(con);
 708         return length;
 709 }
 710
 711 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
 712 {
 713         char *scon, *tcon;
 714         u32 ssid, tsid, newsid;
 715         u16 tclass;
 716         ssize_t length;
 717         char *newcon;
 718         u32 len;
 719
 720         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 721         if (length)
 722                 return length;
 723
 724         length = -ENOMEM;
 725         scon = kzalloc(size+1, GFP_KERNEL);
 726         if (!scon)
 727                 return length;
 728
 729         tcon = kzalloc(size+1, GFP_KERNEL);
 730         if (!tcon)
 731                 goto out;
 732
 733         length = -EINVAL;
 734         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 735                 goto out2;
 736
 737         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 738         if (length < 0)
 739                 goto out2;
 740         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 741         if (length < 0)
 742                 goto out2;
 743
 744         length = security_member_sid(ssid, tsid, tclass, &newsid);
 745         if (length < 0)
 746                 goto out2;
 747
 748         length = security_sid_to_context(newsid, &newcon, &len);
 749         if (length < 0)
 750                 goto out2;
 751
 752         if (len > SIMPLE_TRANSACTION_LIMIT) {
 753                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 754                        "max\n", __FUNCTION__, len);
 755                 length = -ERANGE;
 756                 goto out3;
 757         }
 758
 759         memcpy(buf, newcon, len);
 760         length = len;
 761 out3:
 762         kfree(newcon);
 763 out2:
 764         kfree(tcon);
 765 out:
 766         kfree(scon);
 767         return length;
 768 }
 769
 770 static struct inode *sel_make_inode(struct super_block *sb, int mode)
 771 {
 772         struct inode *ret = new_inode(sb);
 773
 774         if (ret) {
 775                 ret->i_mode = mode;
 776                 ret->i_uid = ret->i_gid = 0;
 777                 ret->i_blocks = 0;
 778                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
 779         }
 780         return ret;
 781 }
 782
 783 #define BOOL_INO_OFFSET 30
 784
 785 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 786                              size_t count, loff_t *ppos)
 787 {
 788         char *page = NULL;
 789         ssize_t length;
 790         ssize_t ret;
 791         int cur_enforcing;
 792         struct inode *inode;
 793
 794         mutex_lock(&sel_mutex);
 795
 796         ret = -EFAULT;
 797
 798         /* check to see if this file has been deleted */
 799         if (!filep->f_op)
 800                 goto out;
 801
 802         if (count > PAGE_SIZE) {
 803                 ret = -EINVAL;
 804                 goto out;
 805         }
 806         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
 807                 ret = -ENOMEM;
 808                 goto out;
 809         }
 810
 811         inode = filep->f_path.dentry->d_inode;
 812         cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
 813         if (cur_enforcing < 0) {
 814                 ret = cur_enforcing;
 815                 goto out;
 816         }
 817
 818         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
 819                           bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
 820         ret = simple_read_from_buffer(buf, count, ppos, page, length);
 821 out:
 822         mutex_unlock(&sel_mutex);
 823         if (page)
 824                 free_page((unsigned long)page);
 825         return ret;
 826 }
 827
 828 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
 829                               size_t count, loff_t *ppos)
 830 {
 831         char *page = NULL;
 832         ssize_t length = -EFAULT;
 833         int new_value;
 834         struct inode *inode;
 835
 836         mutex_lock(&sel_mutex);
 837
 838         length = task_has_security(current, SECURITY__SETBOOL);
 839         if (length)
 840                 goto out;
 841
 842         /* check to see if this file has been deleted */
 843         if (!filep->f_op)
 844                 goto out;
 845
 846         if (count >= PAGE_SIZE) {
 847                 length = -ENOMEM;
 848                 goto out;
 849         }
 850         if (*ppos != 0) {
 851                 /* No partial writes. */
 852                 goto out;
 853         }
 854         page = (char*)get_zeroed_page(GFP_KERNEL);
 855         if (!page) {
 856                 length = -ENOMEM;
 857                 goto out;
 858         }
 859
 860         if (copy_from_user(page, buf, count))
 861                 goto out;
 862
 863         length = -EINVAL;
 864         if (sscanf(page, "%d", &new_value) != 1)
 865                 goto out;
 866
 867         if (new_value)
 868                 new_value = 1;
 869
 870         inode = filep->f_path.dentry->d_inode;
 871         bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
 872         length = count;
 873
 874 out:
 875         mutex_unlock(&sel_mutex);
 876         if (page)
 877                 free_page((unsigned long) page);
 878         return length;
 879 }
 880
 881 static const struct file_operations sel_bool_ops = {
 882         .read           = sel_read_bool,
 883         .write          = sel_write_bool,
 884 };
 885
 886 static ssize_t sel_commit_bools_write(struct file *filep,
 887                                       const char __user *buf,
 888                                       size_t count, loff_t *ppos)
 889 {
 890         char *page = NULL;
 891         ssize_t length = -EFAULT;
 892         int new_value;
 893
 894         mutex_lock(&sel_mutex);
 895
 896         length = task_has_security(current, SECURITY__SETBOOL);
 897         if (length)
 898                 goto out;
 899
 900         /* check to see if this file has been deleted */
 901         if (!filep->f_op)
 902                 goto out;
 903
 904         if (count >= PAGE_SIZE) {
 905                 length = -ENOMEM;
 906                 goto out;
 907         }
 908         if (*ppos != 0) {
 909                 /* No partial writes. */
 910                 goto out;
 911         }
 912         page = (char*)get_zeroed_page(GFP_KERNEL);
 913         if (!page) {
 914                 length = -ENOMEM;
 915                 goto out;
 916         }
 917
 918         if (copy_from_user(page, buf, count))
 919                 goto out;
 920
 921         length = -EINVAL;
 922         if (sscanf(page, "%d", &new_value) != 1)
 923                 goto out;
 924
 925         if (new_value && bool_pending_values) {
 926                 security_set_bools(bool_num, bool_pending_values);
 927         }
 928
 929         length = count;
 930
 931 out:
 932         mutex_unlock(&sel_mutex);
 933         if (page)
 934                 free_page((unsigned long) page);
 935         return length;
 936 }
 937
 938 static const struct file_operations sel_commit_bools_ops = {
 939         .write          = sel_commit_bools_write,
 940 };
 941
 942 /* delete booleans - partial revoke() from
 943  * fs/proc/generic.c proc_kill_inodes */
 944 static void sel_remove_bools(struct dentry *de)
 945 {
 946         struct list_head *p, *node;
 947         struct super_block *sb = de->d_sb;
 948
 949         spin_lock(&dcache_lock);
 950         node = de->d_subdirs.next;
 951         while (node != &de->d_subdirs) {
 952                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
 953                 list_del_init(node);
 954
 955                 if (d->d_inode) {
 956                         d = dget_locked(d);
 957                         spin_unlock(&dcache_lock);
 958                         d_delete(d);
 959                         simple_unlink(de->d_inode, d);
 960                         dput(d);
 961                         spin_lock(&dcache_lock);
 962                 }
 963                 node = de->d_subdirs.next;
 964         }
 965
 966         spin_unlock(&dcache_lock);
 967
 968         file_list_lock();
 969         list_for_each(p, &sb->s_files) {
 970                 struct file * filp = list_entry(p, struct file, f_u.fu_list);
 971                 struct dentry * dentry = filp->f_path.dentry;
 972
 973                 if (dentry->d_parent != de) {
 974                         continue;
 975                 }
 976                 filp->f_op = NULL;
 977         }
 978         file_list_unlock();
 979 }
 980
 981 #define BOOL_DIR_NAME "booleans"
 982
 983 static int sel_make_bools(void)
 984 {
 985         int i, ret = 0;
 986         ssize_t len;
 987         struct dentry *dentry = NULL;
 988         struct dentry *dir = bool_dir;
 989         struct inode *inode = NULL;
 990         struct inode_security_struct *isec;
 991         char **names = NULL, *page;
 992         int num;
 993         int *values = NULL;
 994         u32 sid;
 995
 996         /* remove any existing files */
 997         kfree(bool_pending_values);
 998         bool_pending_values = NULL;
 999
1000         sel_remove_bools(dir);
1001
1002         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1003                 return -ENOMEM;
1004
1005         ret = security_get_bools(&num, &names, &values);
1006         if (ret != 0)
1007                 goto out;
1008
1009         for (i = 0; i < num; i++) {
1010                 dentry = d_alloc_name(dir, names[i]);
1011                 if (!dentry) {
1012                         ret = -ENOMEM;
1013                         goto err;
1014                 }
1015                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1016                 if (!inode) {
1017                         ret = -ENOMEM;
1018                         goto err;
1019                 }
1020
1021                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1022                 if (len < 0) {
1023                         ret = -EINVAL;
1024                         goto err;
1025                 } else if (len >= PAGE_SIZE) {
1026                         ret = -ENAMETOOLONG;
1027                         goto err;
1028                 }
1029                 isec = (struct inode_security_struct*)inode->i_security;
1030                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1031                         goto err;
1032                 isec->sid = sid;
1033                 isec->initialized = 1;
1034                 inode->i_fop = &sel_bool_ops;
1035                 inode->i_ino = i + BOOL_INO_OFFSET;
1036                 d_add(dentry, inode);
1037         }
1038         bool_num = num;
1039         bool_pending_values = values;
1040 out:
1041         free_page((unsigned long)page);
1042         if (names) {
1043                 for (i = 0; i < num; i++)
1044                         kfree(names[i]);
1045                 kfree(names);
1046         }
1047         return ret;
1048 err:
1049         kfree(values);
1050         sel_remove_bools(dir);
1051         ret = -ENOMEM;
1052         goto out;
1053 }
1054
1055 #define NULL_FILE_NAME "null"
1056
1057 struct dentry *selinux_null = NULL;
1058
1059 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1060                                             size_t count, loff_t *ppos)
1061 {
1062         char tmpbuf[TMPBUFLEN];
1063         ssize_t length;
1064
1065         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1066         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1067 }
1068
1069 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1070                                              const char __user * buf,
1071                                              size_t count, loff_t *ppos)
1072
1073 {
1074         char *page;
1075         ssize_t ret;
1076         int new_value;
1077
1078         if (count >= PAGE_SIZE) {
1079                 ret = -ENOMEM;
1080                 goto out;
1081         }
1082
1083         if (*ppos != 0) {
1084                 /* No partial writes. */
1085                 ret = -EINVAL;
1086                 goto out;
1087         }
1088
1089         page = (char*)get_zeroed_page(GFP_KERNEL);
1090         if (!page) {
1091                 ret = -ENOMEM;
1092                 goto out;
1093         }
1094
1095         if (copy_from_user(page, buf, count)) {
1096                 ret = -EFAULT;
1097                 goto out_free;
1098         }
1099
1100         if (sscanf(page, "%u", &new_value) != 1) {
1101                 ret = -EINVAL;
1102                 goto out;
1103         }
1104
1105         if (new_value != avc_cache_threshold) {
1106                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1107                 if (ret)
1108                         goto out_free;
1109                 avc_cache_threshold = new_value;
1110         }
1111         ret = count;
1112 out_free:
1113         free_page((unsigned long)page);
1114 out:
1115         return ret;
1116 }
1117
1118 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1119                                        size_t count, loff_t *ppos)
1120 {
1121         char *page;
1122         ssize_t ret = 0;
1123
1124         page = (char *)__get_free_page(GFP_KERNEL);
1125         if (!page) {
1126                 ret = -ENOMEM;
1127                 goto out;
1128         }
1129         ret = avc_get_hash_stats(page);
1130         if (ret >= 0)
1131                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1132         free_page((unsigned long)page);
1133 out:
1134         return ret;
1135 }
1136
1137 static const struct file_operations sel_avc_cache_threshold_ops = {
1138         .read           = sel_read_avc_cache_threshold,
1139         .write          = sel_write_avc_cache_threshold,
1140 };
1141
1142 static const struct file_operations sel_avc_hash_stats_ops = {
1143         .read           = sel_read_avc_hash_stats,
1144 };
1145
1146 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1147 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1148 {
1149         int cpu;
1150
1151         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1152                 if (!cpu_possible(cpu))
1153                         continue;
1154                 *idx = cpu + 1;
1155                 return &per_cpu(avc_cache_stats, cpu);
1156         }
1157         return NULL;
1158 }
1159
1160 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1161 {
1162         loff_t n = *pos - 1;
1163
1164         if (*pos == 0)
1165                 return SEQ_START_TOKEN;
1166
1167         return sel_avc_get_stat_idx(&n);
1168 }
1169
1170 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1171 {
1172         return sel_avc_get_stat_idx(pos);
1173 }
1174
1175 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1176 {
1177         struct avc_cache_stats *st = v;
1178
1179         if (v == SEQ_START_TOKEN)
1180                 seq_printf(seq, "lookups hits misses allocations reclaims "
1181                            "frees\n");
1182         else
1183                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1184                            st->hits, st->misses, st->allocations,
1185                            st->reclaims, st->frees);
1186         return 0;
1187 }
1188
1189 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1190 { }
1191
1192 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1193         .start          = sel_avc_stats_seq_start,
1194         .next           = sel_avc_stats_seq_next,
1195         .show           = sel_avc_stats_seq_show,
1196         .stop           = sel_avc_stats_seq_stop,
1197 };
1198
1199 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1200 {
1201         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1202 }
1203
1204 static const struct file_operations sel_avc_cache_stats_ops = {
1205         .open           = sel_open_avc_cache_stats,
1206         .read           = seq_read,
1207         .llseek         = seq_lseek,
1208         .release        = seq_release,
1209 };
1210 #endif
1211
1212 static int sel_make_avc_files(struct dentry *dir)
1213 {
1214         int i, ret = 0;
1215         static struct tree_descr files[] = {
1216                 { "cache_threshold",
1217                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1218                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1219 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1220                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1221 #endif
1222         };
1223
1224         for (i = 0; i < ARRAY_SIZE(files); i++) {
1225                 struct inode *inode;
1226                 struct dentry *dentry;
1227
1228                 dentry = d_alloc_name(dir, files[i].name);
1229                 if (!dentry) {
1230                         ret = -ENOMEM;
1231                         goto out;
1232                 }
1233
1234                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1235                 if (!inode) {
1236                         ret = -ENOMEM;
1237                         goto out;
1238                 }
1239                 inode->i_fop = files[i].ops;
1240                 d_add(dentry, inode);
1241         }
1242 out:
1243         return ret;
1244 }
1245
1246 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1247                                 size_t count, loff_t *ppos)
1248 {
1249         struct inode *inode;
1250         char *con;
1251         u32 sid, len;
1252         ssize_t ret;
1253
1254         inode = file->f_path.dentry->d_inode;
1255         sid = inode->i_ino&SEL_INO_MASK;
1256         ret = security_sid_to_context(sid, &con, &len);
1257         if (ret < 0)
1258                 return ret;
1259
1260         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1261         kfree(con);
1262         return ret;
1263 }
1264
1265 static const struct file_operations sel_initcon_ops = {
1266         .read           = sel_read_initcon,
1267 };
1268
1269 static int sel_make_initcon_files(struct dentry *dir)
1270 {
1271         int i, ret = 0;
1272
1273         for (i = 1; i <= SECINITSID_NUM; i++) {
1274                 struct inode *inode;
1275                 struct dentry *dentry;
1276                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1277                 if (!dentry) {
1278                         ret = -ENOMEM;
1279                         goto out;
1280                 }
1281
1282                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1283                 if (!inode) {
1284                         ret = -ENOMEM;
1285                         goto out;
1286                 }
1287                 inode->i_fop = &sel_initcon_ops;
1288                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1289                 d_add(dentry, inode);
1290         }
1291 out:
1292         return ret;
1293 }
1294
1295 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1296 {
1297         int ret = 0;
1298         struct inode *inode;
1299
1300         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1301         if (!inode) {
1302                 ret = -ENOMEM;
1303                 goto out;
1304         }
1305         inode->i_op = &simple_dir_inode_operations;
1306         inode->i_fop = &simple_dir_operations;
1307         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1308         inc_nlink(inode);
1309         d_add(dentry, inode);
1310         /* bump link count on parent directory, too */
1311         inc_nlink(dir);
1312 out:
1313         return ret;
1314 }
1315
1316 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1317 {
1318         int ret;
1319         struct dentry *dentry;
1320         struct inode *inode, *root_inode;
1321         struct inode_security_struct *isec;
1322
1323         static struct tree_descr selinux_files[] = {
1324                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1325                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1326                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1327                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1328                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1329                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1330                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1331                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1332                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1333                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1334                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1335                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1336                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1337                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1338                 /* last one */ {""}
1339         };
1340         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1341         if (ret)
1342                 goto err;
1343
1344         root_inode = sb->s_root->d_inode;
1345
1346         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1347         if (!dentry) {
1348                 ret = -ENOMEM;
1349                 goto err;
1350         }
1351
1352         ret = sel_make_dir(root_inode, dentry);
1353         if (ret)
1354                 goto err;
1355
1356         bool_dir = dentry;
1357
1358         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1359         if (!dentry) {
1360                 ret = -ENOMEM;
1361                 goto err;
1362         }
1363
1364         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1365         if (!inode) {
1366                 ret = -ENOMEM;
1367                 goto err;
1368         }
1369         isec = (struct inode_security_struct*)inode->i_security;
1370         isec->sid = SECINITSID_DEVNULL;
1371         isec->sclass = SECCLASS_CHR_FILE;
1372         isec->initialized = 1;
1373
1374         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1375         d_add(dentry, inode);
1376         selinux_null = dentry;
1377
1378         dentry = d_alloc_name(sb->s_root, "avc");
1379         if (!dentry) {
1380                 ret = -ENOMEM;
1381                 goto err;
1382         }
1383
1384         ret = sel_make_dir(root_inode, dentry);
1385         if (ret)
1386                 goto err;
1387
1388         ret = sel_make_avc_files(dentry);
1389         if (ret)
1390                 goto err;
1391
1392         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1393         if (!dentry) {
1394                 ret = -ENOMEM;
1395                 goto err;
1396         }
1397
1398         ret = sel_make_dir(root_inode, dentry);
1399         if (ret)
1400                 goto err;
1401
1402         ret = sel_make_initcon_files(dentry);
1403         if (ret)
1404                 goto err;
1405
1406 out:
1407         return ret;
1408 err:
1409         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1410         goto out;
1411 }
1412
1413 static int sel_get_sb(struct file_system_type *fs_type,
1414                       int flags, const char *dev_name, void *data,
1415                       struct vfsmount *mnt)
1416 {
1417         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1418 }
1419
1420 static struct file_system_type sel_fs_type = {
1421         .name           = "selinuxfs",
1422         .get_sb         = sel_get_sb,
1423         .kill_sb        = kill_litter_super,
1424 };
1425
1426 struct vfsmount *selinuxfs_mount;
1427
1428 static int __init init_sel_fs(void)
1429 {
1430         int err;
1431
1432         if (!selinux_enabled)
1433                 return 0;
1434         err = register_filesystem(&sel_fs_type);
1435         if (!err) {
1436                 selinuxfs_mount = kern_mount(&sel_fs_type);
1437                 if (IS_ERR(selinuxfs_mount)) {
1438                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1439                         err = PTR_ERR(selinuxfs_mount);
1440                         selinuxfs_mount = NULL;
1441                 }
1442         }
1443         return err;
1444 }
1445
1446 __initcall(init_sel_fs);
1447
1448 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1449 void exit_sel_fs(void)
1450 {
1451         unregister_filesystem(&sel_fs_type);
1452 }
1453 #endif