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_MEMBER,     /* compute polyinstantiation membership decision */
 100         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 101         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
 102         SEL_INO_NEXT,   /* The next inode number to use */
 103 };
 104
 105 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 106
 107 #define SEL_INITCON_INO_OFFSET  0x01000000
 108 #define SEL_BOOL_INO_OFFSET     0x02000000
 109 #define SEL_INO_MASK            0x00ffffff
 110
 111 #define TMPBUFLEN       12
 112 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 113                                 size_t count, loff_t *ppos)
 114 {
 115         char tmpbuf[TMPBUFLEN];
 116         ssize_t length;
 117
 118         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 119         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 120 }
 121
 122 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 123 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
 124                                  size_t count, loff_t *ppos)
 125
 126 {
 127         char *page;
 128         ssize_t length;
 129         int new_value;
 130
 131         if (count >= PAGE_SIZE)
 132                 return -ENOMEM;
 133         if (*ppos != 0) {
 134                 /* No partial writes. */
 135                 return -EINVAL;
 136         }
 137         page = (char*)get_zeroed_page(GFP_KERNEL);
 138         if (!page)
 139                 return -ENOMEM;
 140         length = -EFAULT;
 141         if (copy_from_user(page, buf, count))
 142                 goto out;
 143
 144         length = -EINVAL;
 145         if (sscanf(page, "%d", &new_value) != 1)
 146                 goto out;
 147
 148         if (new_value != selinux_enforcing) {
 149                 length = task_has_security(current, SECURITY__SETENFORCE);
 150                 if (length)
 151                         goto out;
 152                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 153                         "enforcing=%d old_enforcing=%d auid=%u", new_value,
 154                         selinux_enforcing,
 155                         audit_get_loginuid(current->audit_context));
 156                 selinux_enforcing = new_value;
 157                 if (selinux_enforcing)
 158                         avc_ss_reset(0);
 159                 selnl_notify_setenforce(selinux_enforcing);
 160         }
 161         length = count;
 162 out:
 163         free_page((unsigned long) page);
 164         return length;
 165 }
 166 #else
 167 #define sel_write_enforce NULL
 168 #endif
 169
 170 static const struct file_operations sel_enforce_ops = {
 171         .read           = sel_read_enforce,
 172         .write          = sel_write_enforce,
 173 };
 174
 175 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 176 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
 177                                  size_t count, loff_t *ppos)
 178
 179 {
 180         char *page;
 181         ssize_t length;
 182         int new_value;
 183         extern int selinux_disable(void);
 184
 185         if (count >= PAGE_SIZE)
 186                 return -ENOMEM;
 187         if (*ppos != 0) {
 188                 /* No partial writes. */
 189                 return -EINVAL;
 190         }
 191         page = (char*)get_zeroed_page(GFP_KERNEL);
 192         if (!page)
 193                 return -ENOMEM;
 194         length = -EFAULT;
 195         if (copy_from_user(page, buf, count))
 196                 goto out;
 197
 198         length = -EINVAL;
 199         if (sscanf(page, "%d", &new_value) != 1)
 200                 goto out;
 201
 202         if (new_value) {
 203                 length = selinux_disable();
 204                 if (length < 0)
 205                         goto out;
 206                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 207                         "selinux=0 auid=%u",
 208                         audit_get_loginuid(current->audit_context));
 209         }
 210
 211         length = count;
 212 out:
 213         free_page((unsigned long) page);
 214         return length;
 215 }
 216 #else
 217 #define sel_write_disable NULL
 218 #endif
 219
 220 static const struct file_operations sel_disable_ops = {
 221         .write          = sel_write_disable,
 222 };
 223
 224 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 225                                    size_t count, loff_t *ppos)
 226 {
 227         char tmpbuf[TMPBUFLEN];
 228         ssize_t length;
 229
 230         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 231         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 232 }
 233
 234 static const struct file_operations sel_policyvers_ops = {
 235         .read           = sel_read_policyvers,
 236 };
 237
 238 /* declaration for sel_write_load */
 239 static int sel_make_bools(void);
 240
 241 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 242                                 size_t count, loff_t *ppos)
 243 {
 244         char tmpbuf[TMPBUFLEN];
 245         ssize_t length;
 246
 247         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
 248         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 249 }
 250
 251 static const struct file_operations sel_mls_ops = {
 252         .read           = sel_read_mls,
 253 };
 254
 255 static ssize_t sel_write_load(struct file * file, const char __user * buf,
 256                               size_t count, loff_t *ppos)
 257
 258 {
 259         int ret;
 260         ssize_t length;
 261         void *data = NULL;
 262
 263         mutex_lock(&sel_mutex);
 264
 265         length = task_has_security(current, SECURITY__LOAD_POLICY);
 266         if (length)
 267                 goto out;
 268
 269         if (*ppos != 0) {
 270                 /* No partial writes. */
 271                 length = -EINVAL;
 272                 goto out;
 273         }
 274
 275         if ((count > 64 * 1024 * 1024)
 276             || (data = vmalloc(count)) == NULL) {
 277                 length = -ENOMEM;
 278                 goto out;
 279         }
 280
 281         length = -EFAULT;
 282         if (copy_from_user(data, buf, count) != 0)
 283                 goto out;
 284
 285         length = security_load_policy(data, count);
 286         if (length)
 287                 goto out;
 288
 289         ret = sel_make_bools();
 290         if (ret)
 291                 length = ret;
 292         else
 293                 length = count;
 294         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 295                 "policy loaded auid=%u",
 296                 audit_get_loginuid(current->audit_context));
 297 out:
 298         mutex_unlock(&sel_mutex);
 299         vfree(data);
 300         return length;
 301 }
 302
 303 static const struct file_operations sel_load_ops = {
 304         .write          = sel_write_load,
 305 };
 306
 307 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
 308 {
 309         char *canon;
 310         u32 sid, len;
 311         ssize_t length;
 312
 313         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 314         if (length)
 315                 return length;
 316
 317         length = security_context_to_sid(buf, size, &sid);
 318         if (length < 0)
 319                 return length;
 320
 321         length = security_sid_to_context(sid, &canon, &len);
 322         if (length < 0)
 323                 return length;
 324
 325         if (len > SIMPLE_TRANSACTION_LIMIT) {
 326                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 327                        "max\n", __FUNCTION__, len);
 328                 length = -ERANGE;
 329                 goto out;
 330         }
 331
 332         memcpy(buf, canon, len);
 333         length = len;
 334 out:
 335         kfree(canon);
 336         return length;
 337 }
 338
 339 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 340                                      size_t count, loff_t *ppos)
 341 {
 342         char tmpbuf[TMPBUFLEN];
 343         ssize_t length;
 344
 345         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 346         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 347 }
 348
 349 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
 350                                       size_t count, loff_t *ppos)
 351 {
 352         char *page;
 353         ssize_t length;
 354         unsigned int new_value;
 355
 356         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 357         if (length)
 358                 return length;
 359
 360         if (count >= PAGE_SIZE)
 361                 return -ENOMEM;
 362         if (*ppos != 0) {
 363                 /* No partial writes. */
 364                 return -EINVAL;
 365         }
 366         page = (char*)get_zeroed_page(GFP_KERNEL);
 367         if (!page)
 368                 return -ENOMEM;
 369         length = -EFAULT;
 370         if (copy_from_user(page, buf, count))
 371                 goto out;
 372
 373         length = -EINVAL;
 374         if (sscanf(page, "%u", &new_value) != 1)
 375                 goto out;
 376
 377         selinux_checkreqprot = new_value ? 1 : 0;
 378         length = count;
 379 out:
 380         free_page((unsigned long) page);
 381         return length;
 382 }
 383 static const struct file_operations sel_checkreqprot_ops = {
 384         .read           = sel_read_checkreqprot,
 385         .write          = sel_write_checkreqprot,
 386 };
 387
 388 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
 389                                    size_t count, loff_t *ppos)
 390 {
 391         char tmpbuf[TMPBUFLEN];
 392         ssize_t length;
 393
 394         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
 395         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 396 }
 397
 398 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
 399                                     size_t count, loff_t *ppos)
 400 {
 401         char *page;
 402         ssize_t length;
 403         int new_value;
 404
 405         length = task_has_security(current, SECURITY__LOAD_POLICY);
 406         if (length)
 407                 return length;
 408
 409         if (count >= PAGE_SIZE)
 410                 return -ENOMEM;
 411         if (*ppos != 0) {
 412                 /* No partial writes. */
 413                 return -EINVAL;
 414         }
 415         page = (char*)get_zeroed_page(GFP_KERNEL);
 416         if (!page)
 417                 return -ENOMEM;
 418         length = -EFAULT;
 419         if (copy_from_user(page, buf, count))
 420                 goto out;
 421
 422         length = -EINVAL;
 423         if (sscanf(page, "%d", &new_value) != 1)
 424                 goto out;
 425
 426         selinux_compat_net = new_value ? 1 : 0;
 427         length = count;
 428 out:
 429         free_page((unsigned long) page);
 430         return length;
 431 }
 432 static const struct file_operations sel_compat_net_ops = {
 433         .read           = sel_read_compat_net,
 434         .write          = sel_write_compat_net,
 435 };
 436
 437 /*
 438  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 439  */
 440 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
 441 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
 442 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
 443 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
 444 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
 445
 446 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 447         [SEL_ACCESS] = sel_write_access,
 448         [SEL_CREATE] = sel_write_create,
 449         [SEL_RELABEL] = sel_write_relabel,
 450         [SEL_USER] = sel_write_user,
 451         [SEL_MEMBER] = sel_write_member,
 452         [SEL_CONTEXT] = sel_write_context,
 453 };
 454
 455 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 456 {
 457         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 458         char *data;
 459         ssize_t rv;
 460
 461         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 462                 return -EINVAL;
 463
 464         data = simple_transaction_get(file, buf, size);
 465         if (IS_ERR(data))
 466                 return PTR_ERR(data);
 467
 468         rv =  write_op[ino](file, data, size);
 469         if (rv>0) {
 470                 simple_transaction_set(file, rv);
 471                 rv = size;
 472         }
 473         return rv;
 474 }
 475
 476 static const struct file_operations transaction_ops = {
 477         .write          = selinux_transaction_write,
 478         .read           = simple_transaction_read,
 479         .release        = simple_transaction_release,
 480 };
 481
 482 /*
 483  * payload - write methods
 484  * If the method has a response, the response should be put in buf,
 485  * and the length returned.  Otherwise return 0 or and -error.
 486  */
 487
 488 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
 489 {
 490         char *scon, *tcon;
 491         u32 ssid, tsid;
 492         u16 tclass;
 493         u32 req;
 494         struct av_decision avd;
 495         ssize_t length;
 496
 497         length = task_has_security(current, SECURITY__COMPUTE_AV);
 498         if (length)
 499                 return length;
 500
 501         length = -ENOMEM;
 502         scon = kzalloc(size+1, GFP_KERNEL);
 503         if (!scon)
 504                 return length;
 505
 506         tcon = kzalloc(size+1, GFP_KERNEL);
 507         if (!tcon)
 508                 goto out;
 509
 510         length = -EINVAL;
 511         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
 512                 goto out2;
 513
 514         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 515         if (length < 0)
 516                 goto out2;
 517         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 518         if (length < 0)
 519                 goto out2;
 520
 521         length = security_compute_av(ssid, tsid, tclass, req, &avd);
 522         if (length < 0)
 523                 goto out2;
 524
 525         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 526                           "%x %x %x %x %u",
 527                           avd.allowed, avd.decided,
 528                           avd.auditallow, avd.auditdeny,
 529                           avd.seqno);
 530 out2:
 531         kfree(tcon);
 532 out:
 533         kfree(scon);
 534         return length;
 535 }
 536
 537 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
 538 {
 539         char *scon, *tcon;
 540         u32 ssid, tsid, newsid;
 541         u16 tclass;
 542         ssize_t length;
 543         char *newcon;
 544         u32 len;
 545
 546         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 547         if (length)
 548                 return length;
 549
 550         length = -ENOMEM;
 551         scon = kzalloc(size+1, GFP_KERNEL);
 552         if (!scon)
 553                 return length;
 554
 555         tcon = kzalloc(size+1, GFP_KERNEL);
 556         if (!tcon)
 557                 goto out;
 558
 559         length = -EINVAL;
 560         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 561                 goto out2;
 562
 563         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 564         if (length < 0)
 565                 goto out2;
 566         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 567         if (length < 0)
 568                 goto out2;
 569
 570         length = security_transition_sid(ssid, tsid, tclass, &newsid);
 571         if (length < 0)
 572                 goto out2;
 573
 574         length = security_sid_to_context(newsid, &newcon, &len);
 575         if (length < 0)
 576                 goto out2;
 577
 578         if (len > SIMPLE_TRANSACTION_LIMIT) {
 579                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 580                        "max\n", __FUNCTION__, len);
 581                 length = -ERANGE;
 582                 goto out3;
 583         }
 584
 585         memcpy(buf, newcon, len);
 586         length = len;
 587 out3:
 588         kfree(newcon);
 589 out2:
 590         kfree(tcon);
 591 out:
 592         kfree(scon);
 593         return length;
 594 }
 595
 596 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
 597 {
 598         char *scon, *tcon;
 599         u32 ssid, tsid, newsid;
 600         u16 tclass;
 601         ssize_t length;
 602         char *newcon;
 603         u32 len;
 604
 605         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 606         if (length)
 607                 return length;
 608
 609         length = -ENOMEM;
 610         scon = kzalloc(size+1, GFP_KERNEL);
 611         if (!scon)
 612                 return length;
 613
 614         tcon = kzalloc(size+1, GFP_KERNEL);
 615         if (!tcon)
 616                 goto out;
 617
 618         length = -EINVAL;
 619         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 620                 goto out2;
 621
 622         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 623         if (length < 0)
 624                 goto out2;
 625         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 626         if (length < 0)
 627                 goto out2;
 628
 629         length = security_change_sid(ssid, tsid, tclass, &newsid);
 630         if (length < 0)
 631                 goto out2;
 632
 633         length = security_sid_to_context(newsid, &newcon, &len);
 634         if (length < 0)
 635                 goto out2;
 636
 637         if (len > SIMPLE_TRANSACTION_LIMIT) {
 638                 length = -ERANGE;
 639                 goto out3;
 640         }
 641
 642         memcpy(buf, newcon, len);
 643         length = len;
 644 out3:
 645         kfree(newcon);
 646 out2:
 647         kfree(tcon);
 648 out:
 649         kfree(scon);
 650         return length;
 651 }
 652
 653 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
 654 {
 655         char *con, *user, *ptr;
 656         u32 sid, *sids;
 657         ssize_t length;
 658         char *newcon;
 659         int i, rc;
 660         u32 len, nsids;
 661
 662         length = task_has_security(current, SECURITY__COMPUTE_USER);
 663         if (length)
 664                 return length;
 665
 666         length = -ENOMEM;
 667         con = kzalloc(size+1, GFP_KERNEL);
 668         if (!con)
 669                 return length;
 670
 671         user = kzalloc(size+1, GFP_KERNEL);
 672         if (!user)
 673                 goto out;
 674
 675         length = -EINVAL;
 676         if (sscanf(buf, "%s %s", con, user) != 2)
 677                 goto out2;
 678
 679         length = security_context_to_sid(con, strlen(con)+1, &sid);
 680         if (length < 0)
 681                 goto out2;
 682
 683         length = security_get_user_sids(sid, user, &sids, &nsids);
 684         if (length < 0)
 685                 goto out2;
 686
 687         length = sprintf(buf, "%u", nsids) + 1;
 688         ptr = buf + length;
 689         for (i = 0; i < nsids; i++) {
 690                 rc = security_sid_to_context(sids[i], &newcon, &len);
 691                 if (rc) {
 692                         length = rc;
 693                         goto out3;
 694                 }
 695                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 696                         kfree(newcon);
 697                         length = -ERANGE;
 698                         goto out3;
 699                 }
 700                 memcpy(ptr, newcon, len);
 701                 kfree(newcon);
 702                 ptr += len;
 703                 length += len;
 704         }
 705 out3:
 706         kfree(sids);
 707 out2:
 708         kfree(user);
 709 out:
 710         kfree(con);
 711         return length;
 712 }
 713
 714 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
 715 {
 716         char *scon, *tcon;
 717         u32 ssid, tsid, newsid;
 718         u16 tclass;
 719         ssize_t length;
 720         char *newcon;
 721         u32 len;
 722
 723         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 724         if (length)
 725                 return length;
 726
 727         length = -ENOMEM;
 728         scon = kzalloc(size+1, GFP_KERNEL);
 729         if (!scon)
 730                 return length;
 731
 732         tcon = kzalloc(size+1, GFP_KERNEL);
 733         if (!tcon)
 734                 goto out;
 735
 736         length = -EINVAL;
 737         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 738                 goto out2;
 739
 740         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 741         if (length < 0)
 742                 goto out2;
 743         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 744         if (length < 0)
 745                 goto out2;
 746
 747         length = security_member_sid(ssid, tsid, tclass, &newsid);
 748         if (length < 0)
 749                 goto out2;
 750
 751         length = security_sid_to_context(newsid, &newcon, &len);
 752         if (length < 0)
 753                 goto out2;
 754
 755         if (len > SIMPLE_TRANSACTION_LIMIT) {
 756                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 757                        "max\n", __FUNCTION__, len);
 758                 length = -ERANGE;
 759                 goto out3;
 760         }
 761
 762         memcpy(buf, newcon, len);
 763         length = len;
 764 out3:
 765         kfree(newcon);
 766 out2:
 767         kfree(tcon);
 768 out:
 769         kfree(scon);
 770         return length;
 771 }
 772
 773 static struct inode *sel_make_inode(struct super_block *sb, int mode)
 774 {
 775         struct inode *ret = new_inode(sb);
 776
 777         if (ret) {
 778                 ret->i_mode = mode;
 779                 ret->i_uid = ret->i_gid = 0;
 780                 ret->i_blocks = 0;
 781                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
 782         }
 783         return ret;
 784 }
 785
 786 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 787                              size_t count, loff_t *ppos)
 788 {
 789         char *page = NULL;
 790         ssize_t length;
 791         ssize_t ret;
 792         int cur_enforcing;
 793         struct inode *inode;
 794
 795         mutex_lock(&sel_mutex);
 796
 797         ret = -EFAULT;
 798
 799         /* check to see if this file has been deleted */
 800         if (!filep->f_op)
 801                 goto out;
 802
 803         if (count > PAGE_SIZE) {
 804                 ret = -EINVAL;
 805                 goto out;
 806         }
 807         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
 808                 ret = -ENOMEM;
 809                 goto out;
 810         }
 811
 812         inode = filep->f_path.dentry->d_inode;
 813         cur_enforcing = security_get_bool_value(inode->i_ino&SEL_INO_MASK);
 814         if (cur_enforcing < 0) {
 815                 ret = cur_enforcing;
 816                 goto out;
 817         }
 818
 819         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
 820                           bool_pending_values[inode->i_ino&SEL_INO_MASK]);
 821         ret = simple_read_from_buffer(buf, count, ppos, page, length);
 822 out:
 823         mutex_unlock(&sel_mutex);
 824         if (page)
 825                 free_page((unsigned long)page);
 826         return ret;
 827 }
 828
 829 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
 830                               size_t count, loff_t *ppos)
 831 {
 832         char *page = NULL;
 833         ssize_t length = -EFAULT;
 834         int new_value;
 835         struct inode *inode;
 836
 837         mutex_lock(&sel_mutex);
 838
 839         length = task_has_security(current, SECURITY__SETBOOL);
 840         if (length)
 841                 goto out;
 842
 843         /* check to see if this file has been deleted */
 844         if (!filep->f_op)
 845                 goto out;
 846
 847         if (count >= PAGE_SIZE) {
 848                 length = -ENOMEM;
 849                 goto out;
 850         }
 851         if (*ppos != 0) {
 852                 /* No partial writes. */
 853                 goto out;
 854         }
 855         page = (char*)get_zeroed_page(GFP_KERNEL);
 856         if (!page) {
 857                 length = -ENOMEM;
 858                 goto out;
 859         }
 860
 861         if (copy_from_user(page, buf, count))
 862                 goto out;
 863
 864         length = -EINVAL;
 865         if (sscanf(page, "%d", &new_value) != 1)
 866                 goto out;
 867
 868         if (new_value)
 869                 new_value = 1;
 870
 871         inode = filep->f_path.dentry->d_inode;
 872         bool_pending_values[inode->i_ino&SEL_INO_MASK] = new_value;
 873         length = count;
 874
 875 out:
 876         mutex_unlock(&sel_mutex);
 877         if (page)
 878                 free_page((unsigned long) page);
 879         return length;
 880 }
 881
 882 static const struct file_operations sel_bool_ops = {
 883         .read           = sel_read_bool,
 884         .write          = sel_write_bool,
 885 };
 886
 887 static ssize_t sel_commit_bools_write(struct file *filep,
 888                                       const char __user *buf,
 889                                       size_t count, loff_t *ppos)
 890 {
 891         char *page = NULL;
 892         ssize_t length = -EFAULT;
 893         int new_value;
 894
 895         mutex_lock(&sel_mutex);
 896
 897         length = task_has_security(current, SECURITY__SETBOOL);
 898         if (length)
 899                 goto out;
 900
 901         /* check to see if this file has been deleted */
 902         if (!filep->f_op)
 903                 goto out;
 904
 905         if (count >= PAGE_SIZE) {
 906                 length = -ENOMEM;
 907                 goto out;
 908         }
 909         if (*ppos != 0) {
 910                 /* No partial writes. */
 911                 goto out;
 912         }
 913         page = (char*)get_zeroed_page(GFP_KERNEL);
 914         if (!page) {
 915                 length = -ENOMEM;
 916                 goto out;
 917         }
 918
 919         if (copy_from_user(page, buf, count))
 920                 goto out;
 921
 922         length = -EINVAL;
 923         if (sscanf(page, "%d", &new_value) != 1)
 924                 goto out;
 925
 926         if (new_value && bool_pending_values) {
 927                 security_set_bools(bool_num, bool_pending_values);
 928         }
 929
 930         length = count;
 931
 932 out:
 933         mutex_unlock(&sel_mutex);
 934         if (page)
 935                 free_page((unsigned long) page);
 936         return length;
 937 }
 938
 939 static const struct file_operations sel_commit_bools_ops = {
 940         .write          = sel_commit_bools_write,
 941 };
 942
 943 /* delete booleans - partial revoke() from
 944  * fs/proc/generic.c proc_kill_inodes */
 945 static void sel_remove_bools(struct dentry *de)
 946 {
 947         struct list_head *p, *node;
 948         struct super_block *sb = de->d_sb;
 949
 950         spin_lock(&dcache_lock);
 951         node = de->d_subdirs.next;
 952         while (node != &de->d_subdirs) {
 953                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
 954                 list_del_init(node);
 955
 956                 if (d->d_inode) {
 957                         d = dget_locked(d);
 958                         spin_unlock(&dcache_lock);
 959                         d_delete(d);
 960                         simple_unlink(de->d_inode, d);
 961                         dput(d);
 962                         spin_lock(&dcache_lock);
 963                 }
 964                 node = de->d_subdirs.next;
 965         }
 966
 967         spin_unlock(&dcache_lock);
 968
 969         file_list_lock();
 970         list_for_each(p, &sb->s_files) {
 971                 struct file * filp = list_entry(p, struct file, f_u.fu_list);
 972                 struct dentry * dentry = filp->f_path.dentry;
 973
 974                 if (dentry->d_parent != de) {
 975                         continue;
 976                 }
 977                 filp->f_op = NULL;
 978         }
 979         file_list_unlock();
 980 }
 981
 982 #define BOOL_DIR_NAME "booleans"
 983
 984 static int sel_make_bools(void)
 985 {
 986         int i, ret = 0;
 987         ssize_t len;
 988         struct dentry *dentry = NULL;
 989         struct dentry *dir = bool_dir;
 990         struct inode *inode = NULL;
 991         struct inode_security_struct *isec;
 992         char **names = NULL, *page;
 993         int num;
 994         int *values = NULL;
 995         u32 sid;
 996
 997         /* remove any existing files */
 998         kfree(bool_pending_values);
 999         bool_pending_values = NULL;
1000
1001         sel_remove_bools(dir);
1002
1003         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1004                 return -ENOMEM;
1005
1006         ret = security_get_bools(&num, &names, &values);
1007         if (ret != 0)
1008                 goto out;
1009
1010         for (i = 0; i < num; i++) {
1011                 dentry = d_alloc_name(dir, names[i]);
1012                 if (!dentry) {
1013                         ret = -ENOMEM;
1014                         goto err;
1015                 }
1016                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1017                 if (!inode) {
1018                         ret = -ENOMEM;
1019                         goto err;
1020                 }
1021
1022                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1023                 if (len < 0) {
1024                         ret = -EINVAL;
1025                         goto err;
1026                 } else if (len >= PAGE_SIZE) {
1027                         ret = -ENAMETOOLONG;
1028                         goto err;
1029                 }
1030                 isec = (struct inode_security_struct*)inode->i_security;
1031                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1032                         goto err;
1033                 isec->sid = sid;
1034                 isec->initialized = 1;
1035                 inode->i_fop = &sel_bool_ops;
1036                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1037                 d_add(dentry, inode);
1038         }
1039         bool_num = num;
1040         bool_pending_values = values;
1041 out:
1042         free_page((unsigned long)page);
1043         if (names) {
1044                 for (i = 0; i < num; i++)
1045                         kfree(names[i]);
1046                 kfree(names);
1047         }
1048         return ret;
1049 err:
1050         kfree(values);
1051         sel_remove_bools(dir);
1052         ret = -ENOMEM;
1053         goto out;
1054 }
1055
1056 #define NULL_FILE_NAME "null"
1057
1058 struct dentry *selinux_null = NULL;
1059
1060 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1061                                             size_t count, loff_t *ppos)
1062 {
1063         char tmpbuf[TMPBUFLEN];
1064         ssize_t length;
1065
1066         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1067         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1068 }
1069
1070 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1071                                              const char __user * buf,
1072                                              size_t count, loff_t *ppos)
1073
1074 {
1075         char *page;
1076         ssize_t ret;
1077         int new_value;
1078
1079         if (count >= PAGE_SIZE) {
1080                 ret = -ENOMEM;
1081                 goto out;
1082         }
1083
1084         if (*ppos != 0) {
1085                 /* No partial writes. */
1086                 ret = -EINVAL;
1087                 goto out;
1088         }
1089
1090         page = (char*)get_zeroed_page(GFP_KERNEL);
1091         if (!page) {
1092                 ret = -ENOMEM;
1093                 goto out;
1094         }
1095
1096         if (copy_from_user(page, buf, count)) {
1097                 ret = -EFAULT;
1098                 goto out_free;
1099         }
1100
1101         if (sscanf(page, "%u", &new_value) != 1) {
1102                 ret = -EINVAL;
1103                 goto out;
1104         }
1105
1106         if (new_value != avc_cache_threshold) {
1107                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1108                 if (ret)
1109                         goto out_free;
1110                 avc_cache_threshold = new_value;
1111         }
1112         ret = count;
1113 out_free:
1114         free_page((unsigned long)page);
1115 out:
1116         return ret;
1117 }
1118
1119 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1120                                        size_t count, loff_t *ppos)
1121 {
1122         char *page;
1123         ssize_t ret = 0;
1124
1125         page = (char *)__get_free_page(GFP_KERNEL);
1126         if (!page) {
1127                 ret = -ENOMEM;
1128                 goto out;
1129         }
1130         ret = avc_get_hash_stats(page);
1131         if (ret >= 0)
1132                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1133         free_page((unsigned long)page);
1134 out:
1135         return ret;
1136 }
1137
1138 static const struct file_operations sel_avc_cache_threshold_ops = {
1139         .read           = sel_read_avc_cache_threshold,
1140         .write          = sel_write_avc_cache_threshold,
1141 };
1142
1143 static const struct file_operations sel_avc_hash_stats_ops = {
1144         .read           = sel_read_avc_hash_stats,
1145 };
1146
1147 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1148 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1149 {
1150         int cpu;
1151
1152         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1153                 if (!cpu_possible(cpu))
1154                         continue;
1155                 *idx = cpu + 1;
1156                 return &per_cpu(avc_cache_stats, cpu);
1157         }
1158         return NULL;
1159 }
1160
1161 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1162 {
1163         loff_t n = *pos - 1;
1164
1165         if (*pos == 0)
1166                 return SEQ_START_TOKEN;
1167
1168         return sel_avc_get_stat_idx(&n);
1169 }
1170
1171 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1172 {
1173         return sel_avc_get_stat_idx(pos);
1174 }
1175
1176 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1177 {
1178         struct avc_cache_stats *st = v;
1179
1180         if (v == SEQ_START_TOKEN)
1181                 seq_printf(seq, "lookups hits misses allocations reclaims "
1182                            "frees\n");
1183         else
1184                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1185                            st->hits, st->misses, st->allocations,
1186                            st->reclaims, st->frees);
1187         return 0;
1188 }
1189
1190 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1191 { }
1192
1193 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1194         .start          = sel_avc_stats_seq_start,
1195         .next           = sel_avc_stats_seq_next,
1196         .show           = sel_avc_stats_seq_show,
1197         .stop           = sel_avc_stats_seq_stop,
1198 };
1199
1200 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1201 {
1202         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1203 }
1204
1205 static const struct file_operations sel_avc_cache_stats_ops = {
1206         .open           = sel_open_avc_cache_stats,
1207         .read           = seq_read,
1208         .llseek         = seq_lseek,
1209         .release        = seq_release,
1210 };
1211 #endif
1212
1213 static int sel_make_avc_files(struct dentry *dir)
1214 {
1215         int i, ret = 0;
1216         static struct tree_descr files[] = {
1217                 { "cache_threshold",
1218                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1219                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1220 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1221                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1222 #endif
1223         };
1224
1225         for (i = 0; i < ARRAY_SIZE(files); i++) {
1226                 struct inode *inode;
1227                 struct dentry *dentry;
1228
1229                 dentry = d_alloc_name(dir, files[i].name);
1230                 if (!dentry) {
1231                         ret = -ENOMEM;
1232                         goto out;
1233                 }
1234
1235                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1236                 if (!inode) {
1237                         ret = -ENOMEM;
1238                         goto out;
1239                 }
1240                 inode->i_fop = files[i].ops;
1241                 inode->i_ino = ++sel_last_ino;
1242                 d_add(dentry, inode);
1243         }
1244 out:
1245         return ret;
1246 }
1247
1248 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1249                                 size_t count, loff_t *ppos)
1250 {
1251         struct inode *inode;
1252         char *con;
1253         u32 sid, len;
1254         ssize_t ret;
1255
1256         inode = file->f_path.dentry->d_inode;
1257         sid = inode->i_ino&SEL_INO_MASK;
1258         ret = security_sid_to_context(sid, &con, &len);
1259         if (ret < 0)
1260                 return ret;
1261
1262         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1263         kfree(con);
1264         return ret;
1265 }
1266
1267 static const struct file_operations sel_initcon_ops = {
1268         .read           = sel_read_initcon,
1269 };
1270
1271 static int sel_make_initcon_files(struct dentry *dir)
1272 {
1273         int i, ret = 0;
1274
1275         for (i = 1; i <= SECINITSID_NUM; i++) {
1276                 struct inode *inode;
1277                 struct dentry *dentry;
1278                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1279                 if (!dentry) {
1280                         ret = -ENOMEM;
1281                         goto out;
1282                 }
1283
1284                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1285                 if (!inode) {
1286                         ret = -ENOMEM;
1287                         goto out;
1288                 }
1289                 inode->i_fop = &sel_initcon_ops;
1290                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1291                 d_add(dentry, inode);
1292         }
1293 out:
1294         return ret;
1295 }
1296
1297 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1298 {
1299         int ret = 0;
1300         struct inode *inode;
1301
1302         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1303         if (!inode) {
1304                 ret = -ENOMEM;
1305                 goto out;
1306         }
1307         inode->i_op = &simple_dir_inode_operations;
1308         inode->i_fop = &simple_dir_operations;
1309         inode->i_ino = ++sel_last_ino;
1310         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1311         inc_nlink(inode);
1312         d_add(dentry, inode);
1313         /* bump link count on parent directory, too */
1314         inc_nlink(dir);
1315 out:
1316         return ret;
1317 }
1318
1319 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1320 {
1321         int ret;
1322         struct dentry *dentry;
1323         struct inode *inode, *root_inode;
1324         struct inode_security_struct *isec;
1325
1326         static struct tree_descr selinux_files[] = {
1327                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1328                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1329                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1330                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1331                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1332                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1333                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1334                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1335                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1336                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1337                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1338                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1339                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1340                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1341                 /* last one */ {""}
1342         };
1343         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1344         if (ret)
1345                 goto err;
1346
1347         root_inode = sb->s_root->d_inode;
1348
1349         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1350         if (!dentry) {
1351                 ret = -ENOMEM;
1352                 goto err;
1353         }
1354
1355         ret = sel_make_dir(root_inode, dentry);
1356         if (ret)
1357                 goto err;
1358
1359         bool_dir = dentry;
1360
1361         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1362         if (!dentry) {
1363                 ret = -ENOMEM;
1364                 goto err;
1365         }
1366
1367         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1368         if (!inode) {
1369                 ret = -ENOMEM;
1370                 goto err;
1371         }
1372         inode->i_ino = ++sel_last_ino;
1373         isec = (struct inode_security_struct*)inode->i_security;
1374         isec->sid = SECINITSID_DEVNULL;
1375         isec->sclass = SECCLASS_CHR_FILE;
1376         isec->initialized = 1;
1377
1378         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1379         d_add(dentry, inode);
1380         selinux_null = dentry;
1381
1382         dentry = d_alloc_name(sb->s_root, "avc");
1383         if (!dentry) {
1384                 ret = -ENOMEM;
1385                 goto err;
1386         }
1387
1388         ret = sel_make_dir(root_inode, dentry);
1389         if (ret)
1390                 goto err;
1391
1392         ret = sel_make_avc_files(dentry);
1393         if (ret)
1394                 goto err;
1395
1396         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1397         if (!dentry) {
1398                 ret = -ENOMEM;
1399                 goto err;
1400         }
1401
1402         ret = sel_make_dir(root_inode, dentry);
1403         if (ret)
1404                 goto err;
1405
1406         ret = sel_make_initcon_files(dentry);
1407         if (ret)
1408                 goto err;
1409
1410 out:
1411         return ret;
1412 err:
1413         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1414         goto out;
1415 }
1416
1417 static int sel_get_sb(struct file_system_type *fs_type,
1418                       int flags, const char *dev_name, void *data,
1419                       struct vfsmount *mnt)
1420 {
1421         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1422 }
1423
1424 static struct file_system_type sel_fs_type = {
1425         .name           = "selinuxfs",
1426         .get_sb         = sel_get_sb,
1427         .kill_sb        = kill_litter_super,
1428 };
1429
1430 struct vfsmount *selinuxfs_mount;
1431
1432 static int __init init_sel_fs(void)
1433 {
1434         int err;
1435
1436         if (!selinux_enabled)
1437                 return 0;
1438         err = register_filesystem(&sel_fs_type);
1439         if (!err) {
1440                 selinuxfs_mount = kern_mount(&sel_fs_type);
1441                 if (IS_ERR(selinuxfs_mount)) {
1442                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1443                         err = PTR_ERR(selinuxfs_mount);
1444                         selinuxfs_mount = NULL;
1445                 }
1446         }
1447         return err;
1448 }
1449
1450 __initcall(init_sel_fs);
1451
1452 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1453 void exit_sel_fs(void)
1454 {
1455         unregister_filesystem(&sel_fs_type);
1456 }
1457 #endif