security/selinux/selinuxfs.c

   1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
   2  *
   3  *      Added conditional policy language extensions
   4  *
   5  *  Updated: Hewlett-Packard <paul.moore@hp.com>
   6  *
   7  *      Added support for the policy capability bitmap
   8  *
   9  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  10  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  11  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  12  *      This program is free software; you can redistribute it and/or modify
  13  *      it under the terms of the GNU General Public License as published by
  14  *      the Free Software Foundation, version 2.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/pagemap.h>
  19 #include <linux/slab.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/fs.h>
  22 #include <linux/mutex.h>
  23 #include <linux/init.h>
  24 #include <linux/string.h>
  25 #include <linux/security.h>
  26 #include <linux/major.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/percpu.h>
  29 #include <linux/audit.h>
  30 #include <asm/uaccess.h>
  31 #include <asm/semaphore.h>
  32
  33 /* selinuxfs pseudo filesystem for exporting the security policy API.
  34    Based on the proc code and the fs/nfsd/nfsctl.c code. */
  35
  36 #include "flask.h"
  37 #include "avc.h"
  38 #include "avc_ss.h"
  39 #include "security.h"
  40 #include "objsec.h"
  41 #include "conditional.h"
  42
  43 /* Policy capability filenames */
  44 static char *policycap_names[] = {
  45         "network_peer_controls"
  46 };
  47
  48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
  49
  50 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
  51 #define SELINUX_COMPAT_NET_VALUE 0
  52 #else
  53 #define SELINUX_COMPAT_NET_VALUE 1
  54 #endif
  55
  56 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
  57
  58 static int __init checkreqprot_setup(char *str)
  59 {
  60         selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
  61         return 1;
  62 }
  63 __setup("checkreqprot=", checkreqprot_setup);
  64
  65 static int __init selinux_compat_net_setup(char *str)
  66 {
  67         selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
  68         return 1;
  69 }
  70 __setup("selinux_compat_net=", selinux_compat_net_setup);
  71
  72
  73 static DEFINE_MUTEX(sel_mutex);
  74
  75 /* global data for booleans */
  76 static struct dentry *bool_dir = NULL;
  77 static int bool_num = 0;
  78 static char **bool_pending_names;
  79 static int *bool_pending_values = NULL;
  80
  81 /* global data for classes */
  82 static struct dentry *class_dir = NULL;
  83 static unsigned long last_class_ino;
  84
  85 /* global data for policy capabilities */
  86 static struct dentry *policycap_dir = NULL;
  87
  88 extern void selnl_notify_setenforce(int val);
  89
  90 /* Check whether a task is allowed to use a security operation. */
  91 static int task_has_security(struct task_struct *tsk,
  92                              u32 perms)
  93 {
  94         struct task_security_struct *tsec;
  95
  96         tsec = tsk->security;
  97         if (!tsec)
  98                 return -EACCES;
  99
 100         return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
 101                             SECCLASS_SECURITY, perms, NULL);
 102 }
 103
 104 enum sel_inos {
 105         SEL_ROOT_INO = 2,
 106         SEL_LOAD,       /* load policy */
 107         SEL_ENFORCE,    /* get or set enforcing status */
 108         SEL_CONTEXT,    /* validate context */
 109         SEL_ACCESS,     /* compute access decision */
 110         SEL_CREATE,     /* compute create labeling decision */
 111         SEL_RELABEL,    /* compute relabeling decision */
 112         SEL_USER,       /* compute reachable user contexts */
 113         SEL_POLICYVERS, /* return policy version for this kernel */
 114         SEL_COMMIT_BOOLS, /* commit new boolean values */
 115         SEL_MLS,        /* return if MLS policy is enabled */
 116         SEL_DISABLE,    /* disable SELinux until next reboot */
 117         SEL_MEMBER,     /* compute polyinstantiation membership decision */
 118         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 119         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
 120         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
 121         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
 122         SEL_INO_NEXT,   /* The next inode number to use */
 123 };
 124
 125 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 126
 127 #define SEL_INITCON_INO_OFFSET          0x01000000
 128 #define SEL_BOOL_INO_OFFSET             0x02000000
 129 #define SEL_CLASS_INO_OFFSET            0x04000000
 130 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
 131 #define SEL_INO_MASK                    0x00ffffff
 132
 133 #define TMPBUFLEN       12
 134 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 135                                 size_t count, loff_t *ppos)
 136 {
 137         char tmpbuf[TMPBUFLEN];
 138         ssize_t length;
 139
 140         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 141         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 142 }
 143
 144 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 145 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
 146                                  size_t count, loff_t *ppos)
 147
 148 {
 149         char *page;
 150         ssize_t length;
 151         int new_value;
 152
 153         if (count >= PAGE_SIZE)
 154                 return -ENOMEM;
 155         if (*ppos != 0) {
 156                 /* No partial writes. */
 157                 return -EINVAL;
 158         }
 159         page = (char*)get_zeroed_page(GFP_KERNEL);
 160         if (!page)
 161                 return -ENOMEM;
 162         length = -EFAULT;
 163         if (copy_from_user(page, buf, count))
 164                 goto out;
 165
 166         length = -EINVAL;
 167         if (sscanf(page, "%d", &new_value) != 1)
 168                 goto out;
 169
 170         if (new_value != selinux_enforcing) {
 171                 length = task_has_security(current, SECURITY__SETENFORCE);
 172                 if (length)
 173                         goto out;
 174                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 175                         "enforcing=%d old_enforcing=%d auid=%u", new_value,
 176                         selinux_enforcing,
 177                         audit_get_loginuid(current->audit_context));
 178                 selinux_enforcing = new_value;
 179                 if (selinux_enforcing)
 180                         avc_ss_reset(0);
 181                 selnl_notify_setenforce(selinux_enforcing);
 182         }
 183         length = count;
 184 out:
 185         free_page((unsigned long) page);
 186         return length;
 187 }
 188 #else
 189 #define sel_write_enforce NULL
 190 #endif
 191
 192 static const struct file_operations sel_enforce_ops = {
 193         .read           = sel_read_enforce,
 194         .write          = sel_write_enforce,
 195 };
 196
 197 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 198                                         size_t count, loff_t *ppos)
 199 {
 200         char tmpbuf[TMPBUFLEN];
 201         ssize_t length;
 202         ino_t ino = filp->f_path.dentry->d_inode->i_ino;
 203         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 204                 security_get_reject_unknown() : !security_get_allow_unknown();
 205
 206         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 207         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 208 }
 209
 210 static const struct file_operations sel_handle_unknown_ops = {
 211         .read           = sel_read_handle_unknown,
 212 };
 213
 214 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 215 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
 216                                  size_t count, loff_t *ppos)
 217
 218 {
 219         char *page;
 220         ssize_t length;
 221         int new_value;
 222         extern int selinux_disable(void);
 223
 224         if (count >= PAGE_SIZE)
 225                 return -ENOMEM;
 226         if (*ppos != 0) {
 227                 /* No partial writes. */
 228                 return -EINVAL;
 229         }
 230         page = (char*)get_zeroed_page(GFP_KERNEL);
 231         if (!page)
 232                 return -ENOMEM;
 233         length = -EFAULT;
 234         if (copy_from_user(page, buf, count))
 235                 goto out;
 236
 237         length = -EINVAL;
 238         if (sscanf(page, "%d", &new_value) != 1)
 239                 goto out;
 240
 241         if (new_value) {
 242                 length = selinux_disable();
 243                 if (length < 0)
 244                         goto out;
 245                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 246                         "selinux=0 auid=%u",
 247                         audit_get_loginuid(current->audit_context));
 248         }
 249
 250         length = count;
 251 out:
 252         free_page((unsigned long) page);
 253         return length;
 254 }
 255 #else
 256 #define sel_write_disable NULL
 257 #endif
 258
 259 static const struct file_operations sel_disable_ops = {
 260         .write          = sel_write_disable,
 261 };
 262
 263 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 264                                    size_t count, loff_t *ppos)
 265 {
 266         char tmpbuf[TMPBUFLEN];
 267         ssize_t length;
 268
 269         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 270         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 271 }
 272
 273 static const struct file_operations sel_policyvers_ops = {
 274         .read           = sel_read_policyvers,
 275 };
 276
 277 /* declaration for sel_write_load */
 278 static int sel_make_bools(void);
 279 static int sel_make_classes(void);
 280 static int sel_make_policycap(void);
 281
 282 /* declaration for sel_make_class_dirs */
 283 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
 284                         unsigned long *ino);
 285
 286 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 287                                 size_t count, loff_t *ppos)
 288 {
 289         char tmpbuf[TMPBUFLEN];
 290         ssize_t length;
 291
 292         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
 293         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 294 }
 295
 296 static const struct file_operations sel_mls_ops = {
 297         .read           = sel_read_mls,
 298 };
 299
 300 static ssize_t sel_write_load(struct file * file, const char __user * buf,
 301                               size_t count, loff_t *ppos)
 302
 303 {
 304         int ret;
 305         ssize_t length;
 306         void *data = NULL;
 307
 308         mutex_lock(&sel_mutex);
 309
 310         length = task_has_security(current, SECURITY__LOAD_POLICY);
 311         if (length)
 312                 goto out;
 313
 314         if (*ppos != 0) {
 315                 /* No partial writes. */
 316                 length = -EINVAL;
 317                 goto out;
 318         }
 319
 320         if ((count > 64 * 1024 * 1024)
 321             || (data = vmalloc(count)) == NULL) {
 322                 length = -ENOMEM;
 323                 goto out;
 324         }
 325
 326         length = -EFAULT;
 327         if (copy_from_user(data, buf, count) != 0)
 328                 goto out;
 329
 330         length = security_load_policy(data, count);
 331         if (length)
 332                 goto out;
 333
 334         ret = sel_make_bools();
 335         if (ret) {
 336                 length = ret;
 337                 goto out1;
 338         }
 339
 340         ret = sel_make_classes();
 341         if (ret) {
 342                 length = ret;
 343                 goto out1;
 344         }
 345
 346         ret = sel_make_policycap();
 347         if (ret)
 348                 length = ret;
 349         else
 350                 length = count;
 351
 352 out1:
 353
 354         printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
 355                (security_get_reject_unknown() ? "reject" :
 356                 (security_get_allow_unknown() ? "allow" : "deny")));
 357
 358         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 359                 "policy loaded auid=%u",
 360                 audit_get_loginuid(current->audit_context));
 361 out:
 362         mutex_unlock(&sel_mutex);
 363         vfree(data);
 364         return length;
 365 }
 366
 367 static const struct file_operations sel_load_ops = {
 368         .write          = sel_write_load,
 369 };
 370
 371 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
 372 {
 373         char *canon;
 374         u32 sid, len;
 375         ssize_t length;
 376
 377         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 378         if (length)
 379                 return length;
 380
 381         length = security_context_to_sid(buf, size, &sid);
 382         if (length < 0)
 383                 return length;
 384
 385         length = security_sid_to_context(sid, &canon, &len);
 386         if (length < 0)
 387                 return length;
 388
 389         if (len > SIMPLE_TRANSACTION_LIMIT) {
 390                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 391                        "max\n", __FUNCTION__, len);
 392                 length = -ERANGE;
 393                 goto out;
 394         }
 395
 396         memcpy(buf, canon, len);
 397         length = len;
 398 out:
 399         kfree(canon);
 400         return length;
 401 }
 402
 403 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 404                                      size_t count, loff_t *ppos)
 405 {
 406         char tmpbuf[TMPBUFLEN];
 407         ssize_t length;
 408
 409         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 410         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 411 }
 412
 413 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
 414                                       size_t count, loff_t *ppos)
 415 {
 416         char *page;
 417         ssize_t length;
 418         unsigned int new_value;
 419
 420         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 421         if (length)
 422                 return length;
 423
 424         if (count >= PAGE_SIZE)
 425                 return -ENOMEM;
 426         if (*ppos != 0) {
 427                 /* No partial writes. */
 428                 return -EINVAL;
 429         }
 430         page = (char*)get_zeroed_page(GFP_KERNEL);
 431         if (!page)
 432                 return -ENOMEM;
 433         length = -EFAULT;
 434         if (copy_from_user(page, buf, count))
 435                 goto out;
 436
 437         length = -EINVAL;
 438         if (sscanf(page, "%u", &new_value) != 1)
 439                 goto out;
 440
 441         selinux_checkreqprot = new_value ? 1 : 0;
 442         length = count;
 443 out:
 444         free_page((unsigned long) page);
 445         return length;
 446 }
 447 static const struct file_operations sel_checkreqprot_ops = {
 448         .read           = sel_read_checkreqprot,
 449         .write          = sel_write_checkreqprot,
 450 };
 451
 452 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
 453                                    size_t count, loff_t *ppos)
 454 {
 455         char tmpbuf[TMPBUFLEN];
 456         ssize_t length;
 457
 458         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
 459         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 460 }
 461
 462 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
 463                                     size_t count, loff_t *ppos)
 464 {
 465         char *page;
 466         ssize_t length;
 467         int new_value;
 468
 469         length = task_has_security(current, SECURITY__LOAD_POLICY);
 470         if (length)
 471                 return length;
 472
 473         if (count >= PAGE_SIZE)
 474                 return -ENOMEM;
 475         if (*ppos != 0) {
 476                 /* No partial writes. */
 477                 return -EINVAL;
 478         }
 479         page = (char*)get_zeroed_page(GFP_KERNEL);
 480         if (!page)
 481                 return -ENOMEM;
 482         length = -EFAULT;
 483         if (copy_from_user(page, buf, count))
 484                 goto out;
 485
 486         length = -EINVAL;
 487         if (sscanf(page, "%d", &new_value) != 1)
 488                 goto out;
 489
 490         selinux_compat_net = new_value ? 1 : 0;
 491         length = count;
 492 out:
 493         free_page((unsigned long) page);
 494         return length;
 495 }
 496 static const struct file_operations sel_compat_net_ops = {
 497         .read           = sel_read_compat_net,
 498         .write          = sel_write_compat_net,
 499 };
 500
 501 /*
 502  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 503  */
 504 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
 505 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
 506 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
 507 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
 508 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
 509
 510 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 511         [SEL_ACCESS] = sel_write_access,
 512         [SEL_CREATE] = sel_write_create,
 513         [SEL_RELABEL] = sel_write_relabel,
 514         [SEL_USER] = sel_write_user,
 515         [SEL_MEMBER] = sel_write_member,
 516         [SEL_CONTEXT] = sel_write_context,
 517 };
 518
 519 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 520 {
 521         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 522         char *data;
 523         ssize_t rv;
 524
 525         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 526                 return -EINVAL;
 527
 528         data = simple_transaction_get(file, buf, size);
 529         if (IS_ERR(data))
 530                 return PTR_ERR(data);
 531
 532         rv =  write_op[ino](file, data, size);
 533         if (rv>0) {
 534                 simple_transaction_set(file, rv);
 535                 rv = size;
 536         }
 537         return rv;
 538 }
 539
 540 static const struct file_operations transaction_ops = {
 541         .write          = selinux_transaction_write,
 542         .read           = simple_transaction_read,
 543         .release        = simple_transaction_release,
 544 };
 545
 546 /*
 547  * payload - write methods
 548  * If the method has a response, the response should be put in buf,
 549  * and the length returned.  Otherwise return 0 or and -error.
 550  */
 551
 552 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
 553 {
 554         char *scon, *tcon;
 555         u32 ssid, tsid;
 556         u16 tclass;
 557         u32 req;
 558         struct av_decision avd;
 559         ssize_t length;
 560
 561         length = task_has_security(current, SECURITY__COMPUTE_AV);
 562         if (length)
 563                 return length;
 564
 565         length = -ENOMEM;
 566         scon = kzalloc(size+1, GFP_KERNEL);
 567         if (!scon)
 568                 return length;
 569
 570         tcon = kzalloc(size+1, GFP_KERNEL);
 571         if (!tcon)
 572                 goto out;
 573
 574         length = -EINVAL;
 575         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
 576                 goto out2;
 577
 578         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 579         if (length < 0)
 580                 goto out2;
 581         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 582         if (length < 0)
 583                 goto out2;
 584
 585         length = security_compute_av(ssid, tsid, tclass, req, &avd);
 586         if (length < 0)
 587                 goto out2;
 588
 589         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 590                           "%x %x %x %x %u",
 591                           avd.allowed, avd.decided,
 592                           avd.auditallow, avd.auditdeny,
 593                           avd.seqno);
 594 out2:
 595         kfree(tcon);
 596 out:
 597         kfree(scon);
 598         return length;
 599 }
 600
 601 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
 602 {
 603         char *scon, *tcon;
 604         u32 ssid, tsid, newsid;
 605         u16 tclass;
 606         ssize_t length;
 607         char *newcon;
 608         u32 len;
 609
 610         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 611         if (length)
 612                 return length;
 613
 614         length = -ENOMEM;
 615         scon = kzalloc(size+1, GFP_KERNEL);
 616         if (!scon)
 617                 return length;
 618
 619         tcon = kzalloc(size+1, GFP_KERNEL);
 620         if (!tcon)
 621                 goto out;
 622
 623         length = -EINVAL;
 624         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 625                 goto out2;
 626
 627         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 628         if (length < 0)
 629                 goto out2;
 630         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 631         if (length < 0)
 632                 goto out2;
 633
 634         length = security_transition_sid(ssid, tsid, tclass, &newsid);
 635         if (length < 0)
 636                 goto out2;
 637
 638         length = security_sid_to_context(newsid, &newcon, &len);
 639         if (length < 0)
 640                 goto out2;
 641
 642         if (len > SIMPLE_TRANSACTION_LIMIT) {
 643                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 644                        "max\n", __FUNCTION__, len);
 645                 length = -ERANGE;
 646                 goto out3;
 647         }
 648
 649         memcpy(buf, newcon, len);
 650         length = len;
 651 out3:
 652         kfree(newcon);
 653 out2:
 654         kfree(tcon);
 655 out:
 656         kfree(scon);
 657         return length;
 658 }
 659
 660 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
 661 {
 662         char *scon, *tcon;
 663         u32 ssid, tsid, newsid;
 664         u16 tclass;
 665         ssize_t length;
 666         char *newcon;
 667         u32 len;
 668
 669         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 670         if (length)
 671                 return length;
 672
 673         length = -ENOMEM;
 674         scon = kzalloc(size+1, GFP_KERNEL);
 675         if (!scon)
 676                 return length;
 677
 678         tcon = kzalloc(size+1, GFP_KERNEL);
 679         if (!tcon)
 680                 goto out;
 681
 682         length = -EINVAL;
 683         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 684                 goto out2;
 685
 686         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 687         if (length < 0)
 688                 goto out2;
 689         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 690         if (length < 0)
 691                 goto out2;
 692
 693         length = security_change_sid(ssid, tsid, tclass, &newsid);
 694         if (length < 0)
 695                 goto out2;
 696
 697         length = security_sid_to_context(newsid, &newcon, &len);
 698         if (length < 0)
 699                 goto out2;
 700
 701         if (len > SIMPLE_TRANSACTION_LIMIT) {
 702                 length = -ERANGE;
 703                 goto out3;
 704         }
 705
 706         memcpy(buf, newcon, len);
 707         length = len;
 708 out3:
 709         kfree(newcon);
 710 out2:
 711         kfree(tcon);
 712 out:
 713         kfree(scon);
 714         return length;
 715 }
 716
 717 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
 718 {
 719         char *con, *user, *ptr;
 720         u32 sid, *sids;
 721         ssize_t length;
 722         char *newcon;
 723         int i, rc;
 724         u32 len, nsids;
 725
 726         length = task_has_security(current, SECURITY__COMPUTE_USER);
 727         if (length)
 728                 return length;
 729
 730         length = -ENOMEM;
 731         con = kzalloc(size+1, GFP_KERNEL);
 732         if (!con)
 733                 return length;
 734
 735         user = kzalloc(size+1, GFP_KERNEL);
 736         if (!user)
 737                 goto out;
 738
 739         length = -EINVAL;
 740         if (sscanf(buf, "%s %s", con, user) != 2)
 741                 goto out2;
 742
 743         length = security_context_to_sid(con, strlen(con)+1, &sid);
 744         if (length < 0)
 745                 goto out2;
 746
 747         length = security_get_user_sids(sid, user, &sids, &nsids);
 748         if (length < 0)
 749                 goto out2;
 750
 751         length = sprintf(buf, "%u", nsids) + 1;
 752         ptr = buf + length;
 753         for (i = 0; i < nsids; i++) {
 754                 rc = security_sid_to_context(sids[i], &newcon, &len);
 755                 if (rc) {
 756                         length = rc;
 757                         goto out3;
 758                 }
 759                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 760                         kfree(newcon);
 761                         length = -ERANGE;
 762                         goto out3;
 763                 }
 764                 memcpy(ptr, newcon, len);
 765                 kfree(newcon);
 766                 ptr += len;
 767                 length += len;
 768         }
 769 out3:
 770         kfree(sids);
 771 out2:
 772         kfree(user);
 773 out:
 774         kfree(con);
 775         return length;
 776 }
 777
 778 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
 779 {
 780         char *scon, *tcon;
 781         u32 ssid, tsid, newsid;
 782         u16 tclass;
 783         ssize_t length;
 784         char *newcon;
 785         u32 len;
 786
 787         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 788         if (length)
 789                 return length;
 790
 791         length = -ENOMEM;
 792         scon = kzalloc(size+1, GFP_KERNEL);
 793         if (!scon)
 794                 return length;
 795
 796         tcon = kzalloc(size+1, GFP_KERNEL);
 797         if (!tcon)
 798                 goto out;
 799
 800         length = -EINVAL;
 801         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 802                 goto out2;
 803
 804         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 805         if (length < 0)
 806                 goto out2;
 807         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 808         if (length < 0)
 809                 goto out2;
 810
 811         length = security_member_sid(ssid, tsid, tclass, &newsid);
 812         if (length < 0)
 813                 goto out2;
 814
 815         length = security_sid_to_context(newsid, &newcon, &len);
 816         if (length < 0)
 817                 goto out2;
 818
 819         if (len > SIMPLE_TRANSACTION_LIMIT) {
 820                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 821                        "max\n", __FUNCTION__, len);
 822                 length = -ERANGE;
 823                 goto out3;
 824         }
 825
 826         memcpy(buf, newcon, len);
 827         length = len;
 828 out3:
 829         kfree(newcon);
 830 out2:
 831         kfree(tcon);
 832 out:
 833         kfree(scon);
 834         return length;
 835 }
 836
 837 static struct inode *sel_make_inode(struct super_block *sb, int mode)
 838 {
 839         struct inode *ret = new_inode(sb);
 840
 841         if (ret) {
 842                 ret->i_mode = mode;
 843                 ret->i_uid = ret->i_gid = 0;
 844                 ret->i_blocks = 0;
 845                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
 846         }
 847         return ret;
 848 }
 849
 850 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 851                              size_t count, loff_t *ppos)
 852 {
 853         char *page = NULL;
 854         ssize_t length;
 855         ssize_t ret;
 856         int cur_enforcing;
 857         struct inode *inode = filep->f_path.dentry->d_inode;
 858         unsigned index = inode->i_ino & SEL_INO_MASK;
 859         const char *name = filep->f_path.dentry->d_name.name;
 860
 861         mutex_lock(&sel_mutex);
 862
 863         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
 864                 ret = -EINVAL;
 865                 goto out;
 866         }
 867
 868         if (count > PAGE_SIZE) {
 869                 ret = -EINVAL;
 870                 goto out;
 871         }
 872         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
 873                 ret = -ENOMEM;
 874                 goto out;
 875         }
 876
 877         cur_enforcing = security_get_bool_value(index);
 878         if (cur_enforcing < 0) {
 879                 ret = cur_enforcing;
 880                 goto out;
 881         }
 882         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
 883                           bool_pending_values[index]);
 884         ret = simple_read_from_buffer(buf, count, ppos, page, length);
 885 out:
 886         mutex_unlock(&sel_mutex);
 887         if (page)
 888                 free_page((unsigned long)page);
 889         return ret;
 890 }
 891
 892 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
 893                               size_t count, loff_t *ppos)
 894 {
 895         char *page = NULL;
 896         ssize_t length;
 897         int new_value;
 898         struct inode *inode = filep->f_path.dentry->d_inode;
 899         unsigned index = inode->i_ino & SEL_INO_MASK;
 900         const char *name = filep->f_path.dentry->d_name.name;
 901
 902         mutex_lock(&sel_mutex);
 903
 904         length = task_has_security(current, SECURITY__SETBOOL);
 905         if (length)
 906                 goto out;
 907
 908         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
 909                 length = -EINVAL;
 910                 goto out;
 911         }
 912
 913         if (count >= PAGE_SIZE) {
 914                 length = -ENOMEM;
 915                 goto out;
 916         }
 917
 918         if (*ppos != 0) {
 919                 /* No partial writes. */
 920                 length = -EINVAL;
 921                 goto out;
 922         }
 923         page = (char*)get_zeroed_page(GFP_KERNEL);
 924         if (!page) {
 925                 length = -ENOMEM;
 926                 goto out;
 927         }
 928
 929         length = -EFAULT;
 930         if (copy_from_user(page, buf, count))
 931                 goto out;
 932
 933         length = -EINVAL;
 934         if (sscanf(page, "%d", &new_value) != 1)
 935                 goto out;
 936
 937         if (new_value)
 938                 new_value = 1;
 939
 940         bool_pending_values[index] = new_value;
 941         length = count;
 942
 943 out:
 944         mutex_unlock(&sel_mutex);
 945         if (page)
 946                 free_page((unsigned long) page);
 947         return length;
 948 }
 949
 950 static const struct file_operations sel_bool_ops = {
 951         .read           = sel_read_bool,
 952         .write          = sel_write_bool,
 953 };
 954
 955 static ssize_t sel_commit_bools_write(struct file *filep,
 956                                       const char __user *buf,
 957                                       size_t count, loff_t *ppos)
 958 {
 959         char *page = NULL;
 960         ssize_t length;
 961         int new_value;
 962
 963         mutex_lock(&sel_mutex);
 964
 965         length = task_has_security(current, SECURITY__SETBOOL);
 966         if (length)
 967                 goto out;
 968
 969         if (count >= PAGE_SIZE) {
 970                 length = -ENOMEM;
 971                 goto out;
 972         }
 973         if (*ppos != 0) {
 974                 /* No partial writes. */
 975                 goto out;
 976         }
 977         page = (char*)get_zeroed_page(GFP_KERNEL);
 978         if (!page) {
 979                 length = -ENOMEM;
 980                 goto out;
 981         }
 982
 983         length = -EFAULT;
 984         if (copy_from_user(page, buf, count))
 985                 goto out;
 986
 987         length = -EINVAL;
 988         if (sscanf(page, "%d", &new_value) != 1)
 989                 goto out;
 990
 991         if (new_value && bool_pending_values) {
 992                 security_set_bools(bool_num, bool_pending_values);
 993         }
 994
 995         length = count;
 996
 997 out:
 998         mutex_unlock(&sel_mutex);
 999         if (page)
1000                 free_page((unsigned long) page);
1001         return length;
1002 }
1003
1004 static const struct file_operations sel_commit_bools_ops = {
1005         .write          = sel_commit_bools_write,
1006 };
1007
1008 static void sel_remove_entries(struct dentry *de)
1009 {
1010         struct list_head *node;
1011
1012         spin_lock(&dcache_lock);
1013         node = de->d_subdirs.next;
1014         while (node != &de->d_subdirs) {
1015                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1016                 list_del_init(node);
1017
1018                 if (d->d_inode) {
1019                         d = dget_locked(d);
1020                         spin_unlock(&dcache_lock);
1021                         d_delete(d);
1022                         simple_unlink(de->d_inode, d);
1023                         dput(d);
1024                         spin_lock(&dcache_lock);
1025                 }
1026                 node = de->d_subdirs.next;
1027         }
1028
1029         spin_unlock(&dcache_lock);
1030 }
1031
1032 #define BOOL_DIR_NAME "booleans"
1033
1034 static int sel_make_bools(void)
1035 {
1036         int i, ret = 0;
1037         ssize_t len;
1038         struct dentry *dentry = NULL;
1039         struct dentry *dir = bool_dir;
1040         struct inode *inode = NULL;
1041         struct inode_security_struct *isec;
1042         char **names = NULL, *page;
1043         int num;
1044         int *values = NULL;
1045         u32 sid;
1046
1047         /* remove any existing files */
1048         kfree(bool_pending_names);
1049         kfree(bool_pending_values);
1050         bool_pending_names = NULL;
1051         bool_pending_values = NULL;
1052
1053         sel_remove_entries(dir);
1054
1055         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1056                 return -ENOMEM;
1057
1058         ret = security_get_bools(&num, &names, &values);
1059         if (ret != 0)
1060                 goto out;
1061
1062         for (i = 0; i < num; i++) {
1063                 dentry = d_alloc_name(dir, names[i]);
1064                 if (!dentry) {
1065                         ret = -ENOMEM;
1066                         goto err;
1067                 }
1068                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1069                 if (!inode) {
1070                         ret = -ENOMEM;
1071                         goto err;
1072                 }
1073
1074                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1075                 if (len < 0) {
1076                         ret = -EINVAL;
1077                         goto err;
1078                 } else if (len >= PAGE_SIZE) {
1079                         ret = -ENAMETOOLONG;
1080                         goto err;
1081                 }
1082                 isec = (struct inode_security_struct*)inode->i_security;
1083                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1084                         goto err;
1085                 isec->sid = sid;
1086                 isec->initialized = 1;
1087                 inode->i_fop = &sel_bool_ops;
1088                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1089                 d_add(dentry, inode);
1090         }
1091         bool_num = num;
1092         bool_pending_names = names;
1093         bool_pending_values = values;
1094 out:
1095         free_page((unsigned long)page);
1096         return ret;
1097 err:
1098         if (names) {
1099                 for (i = 0; i < num; i++)
1100                         kfree(names[i]);
1101                 kfree(names);
1102         }
1103         kfree(values);
1104         sel_remove_entries(dir);
1105         ret = -ENOMEM;
1106         goto out;
1107 }
1108
1109 #define NULL_FILE_NAME "null"
1110
1111 struct dentry *selinux_null = NULL;
1112
1113 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1114                                             size_t count, loff_t *ppos)
1115 {
1116         char tmpbuf[TMPBUFLEN];
1117         ssize_t length;
1118
1119         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1120         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1121 }
1122
1123 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1124                                              const char __user * buf,
1125                                              size_t count, loff_t *ppos)
1126
1127 {
1128         char *page;
1129         ssize_t ret;
1130         int new_value;
1131
1132         if (count >= PAGE_SIZE) {
1133                 ret = -ENOMEM;
1134                 goto out;
1135         }
1136
1137         if (*ppos != 0) {
1138                 /* No partial writes. */
1139                 ret = -EINVAL;
1140                 goto out;
1141         }
1142
1143         page = (char*)get_zeroed_page(GFP_KERNEL);
1144         if (!page) {
1145                 ret = -ENOMEM;
1146                 goto out;
1147         }
1148
1149         if (copy_from_user(page, buf, count)) {
1150                 ret = -EFAULT;
1151                 goto out_free;
1152         }
1153
1154         if (sscanf(page, "%u", &new_value) != 1) {
1155                 ret = -EINVAL;
1156                 goto out;
1157         }
1158
1159         if (new_value != avc_cache_threshold) {
1160                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1161                 if (ret)
1162                         goto out_free;
1163                 avc_cache_threshold = new_value;
1164         }
1165         ret = count;
1166 out_free:
1167         free_page((unsigned long)page);
1168 out:
1169         return ret;
1170 }
1171
1172 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1173                                        size_t count, loff_t *ppos)
1174 {
1175         char *page;
1176         ssize_t ret = 0;
1177
1178         page = (char *)__get_free_page(GFP_KERNEL);
1179         if (!page) {
1180                 ret = -ENOMEM;
1181                 goto out;
1182         }
1183         ret = avc_get_hash_stats(page);
1184         if (ret >= 0)
1185                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1186         free_page((unsigned long)page);
1187 out:
1188         return ret;
1189 }
1190
1191 static const struct file_operations sel_avc_cache_threshold_ops = {
1192         .read           = sel_read_avc_cache_threshold,
1193         .write          = sel_write_avc_cache_threshold,
1194 };
1195
1196 static const struct file_operations sel_avc_hash_stats_ops = {
1197         .read           = sel_read_avc_hash_stats,
1198 };
1199
1200 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1201 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1202 {
1203         int cpu;
1204
1205         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1206                 if (!cpu_possible(cpu))
1207                         continue;
1208                 *idx = cpu + 1;
1209                 return &per_cpu(avc_cache_stats, cpu);
1210         }
1211         return NULL;
1212 }
1213
1214 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1215 {
1216         loff_t n = *pos - 1;
1217
1218         if (*pos == 0)
1219                 return SEQ_START_TOKEN;
1220
1221         return sel_avc_get_stat_idx(&n);
1222 }
1223
1224 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1225 {
1226         return sel_avc_get_stat_idx(pos);
1227 }
1228
1229 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1230 {
1231         struct avc_cache_stats *st = v;
1232
1233         if (v == SEQ_START_TOKEN)
1234                 seq_printf(seq, "lookups hits misses allocations reclaims "
1235                            "frees\n");
1236         else
1237                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1238                            st->hits, st->misses, st->allocations,
1239                            st->reclaims, st->frees);
1240         return 0;
1241 }
1242
1243 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1244 { }
1245
1246 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1247         .start          = sel_avc_stats_seq_start,
1248         .next           = sel_avc_stats_seq_next,
1249         .show           = sel_avc_stats_seq_show,
1250         .stop           = sel_avc_stats_seq_stop,
1251 };
1252
1253 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1254 {
1255         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1256 }
1257
1258 static const struct file_operations sel_avc_cache_stats_ops = {
1259         .open           = sel_open_avc_cache_stats,
1260         .read           = seq_read,
1261         .llseek         = seq_lseek,
1262         .release        = seq_release,
1263 };
1264 #endif
1265
1266 static int sel_make_avc_files(struct dentry *dir)
1267 {
1268         int i, ret = 0;
1269         static struct tree_descr files[] = {
1270                 { "cache_threshold",
1271                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1272                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1273 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1274                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1275 #endif
1276         };
1277
1278         for (i = 0; i < ARRAY_SIZE(files); i++) {
1279                 struct inode *inode;
1280                 struct dentry *dentry;
1281
1282                 dentry = d_alloc_name(dir, files[i].name);
1283                 if (!dentry) {
1284                         ret = -ENOMEM;
1285                         goto out;
1286                 }
1287
1288                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1289                 if (!inode) {
1290                         ret = -ENOMEM;
1291                         goto out;
1292                 }
1293                 inode->i_fop = files[i].ops;
1294                 inode->i_ino = ++sel_last_ino;
1295                 d_add(dentry, inode);
1296         }
1297 out:
1298         return ret;
1299 }
1300
1301 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1302                                 size_t count, loff_t *ppos)
1303 {
1304         struct inode *inode;
1305         char *con;
1306         u32 sid, len;
1307         ssize_t ret;
1308
1309         inode = file->f_path.dentry->d_inode;
1310         sid = inode->i_ino&SEL_INO_MASK;
1311         ret = security_sid_to_context(sid, &con, &len);
1312         if (ret < 0)
1313                 return ret;
1314
1315         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1316         kfree(con);
1317         return ret;
1318 }
1319
1320 static const struct file_operations sel_initcon_ops = {
1321         .read           = sel_read_initcon,
1322 };
1323
1324 static int sel_make_initcon_files(struct dentry *dir)
1325 {
1326         int i, ret = 0;
1327
1328         for (i = 1; i <= SECINITSID_NUM; i++) {
1329                 struct inode *inode;
1330                 struct dentry *dentry;
1331                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1332                 if (!dentry) {
1333                         ret = -ENOMEM;
1334                         goto out;
1335                 }
1336
1337                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1338                 if (!inode) {
1339                         ret = -ENOMEM;
1340                         goto out;
1341                 }
1342                 inode->i_fop = &sel_initcon_ops;
1343                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1344                 d_add(dentry, inode);
1345         }
1346 out:
1347         return ret;
1348 }
1349
1350 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1351 {
1352         return a / b - (a % b < 0);
1353 }
1354
1355 static inline unsigned long sel_class_to_ino(u16 class)
1356 {
1357         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1358 }
1359
1360 static inline u16 sel_ino_to_class(unsigned long ino)
1361 {
1362         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1363 }
1364
1365 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1366 {
1367         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1368 }
1369
1370 static inline u32 sel_ino_to_perm(unsigned long ino)
1371 {
1372         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1373 }
1374
1375 static ssize_t sel_read_class(struct file * file, char __user *buf,
1376                                 size_t count, loff_t *ppos)
1377 {
1378         ssize_t rc, len;
1379         char *page;
1380         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1381
1382         page = (char *)__get_free_page(GFP_KERNEL);
1383         if (!page) {
1384                 rc = -ENOMEM;
1385                 goto out;
1386         }
1387
1388         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1389         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1390         free_page((unsigned long)page);
1391 out:
1392         return rc;
1393 }
1394
1395 static const struct file_operations sel_class_ops = {
1396         .read           = sel_read_class,
1397 };
1398
1399 static ssize_t sel_read_perm(struct file * file, char __user *buf,
1400                                 size_t count, loff_t *ppos)
1401 {
1402         ssize_t rc, len;
1403         char *page;
1404         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1405
1406         page = (char *)__get_free_page(GFP_KERNEL);
1407         if (!page) {
1408                 rc = -ENOMEM;
1409                 goto out;
1410         }
1411
1412         len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino));
1413         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1414         free_page((unsigned long)page);
1415 out:
1416         return rc;
1417 }
1418
1419 static const struct file_operations sel_perm_ops = {
1420         .read           = sel_read_perm,
1421 };
1422
1423 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1424                                   size_t count, loff_t *ppos)
1425 {
1426         int value;
1427         char tmpbuf[TMPBUFLEN];
1428         ssize_t length;
1429         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1430
1431         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1432         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1433
1434         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1435 }
1436
1437 static const struct file_operations sel_policycap_ops = {
1438         .read           = sel_read_policycap,
1439 };
1440
1441 static int sel_make_perm_files(char *objclass, int classvalue,
1442                                 struct dentry *dir)
1443 {
1444         int i, rc = 0, nperms;
1445         char **perms;
1446
1447         rc = security_get_permissions(objclass, &perms, &nperms);
1448         if (rc)
1449                 goto out;
1450
1451         for (i = 0; i < nperms; i++) {
1452                 struct inode *inode;
1453                 struct dentry *dentry;
1454
1455                 dentry = d_alloc_name(dir, perms[i]);
1456                 if (!dentry) {
1457                         rc = -ENOMEM;
1458                         goto out1;
1459                 }
1460
1461                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1462                 if (!inode) {
1463                         rc = -ENOMEM;
1464                         goto out1;
1465                 }
1466                 inode->i_fop = &sel_perm_ops;
1467                 /* i+1 since perm values are 1-indexed */
1468                 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1469                 d_add(dentry, inode);
1470         }
1471
1472 out1:
1473         for (i = 0; i < nperms; i++)
1474                 kfree(perms[i]);
1475         kfree(perms);
1476 out:
1477         return rc;
1478 }
1479
1480 static int sel_make_class_dir_entries(char *classname, int index,
1481                                         struct dentry *dir)
1482 {
1483         struct dentry *dentry = NULL;
1484         struct inode *inode = NULL;
1485         int rc;
1486
1487         dentry = d_alloc_name(dir, "index");
1488         if (!dentry) {
1489                 rc = -ENOMEM;
1490                 goto out;
1491         }
1492
1493         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1494         if (!inode) {
1495                 rc = -ENOMEM;
1496                 goto out;
1497         }
1498
1499         inode->i_fop = &sel_class_ops;
1500         inode->i_ino = sel_class_to_ino(index);
1501         d_add(dentry, inode);
1502
1503         dentry = d_alloc_name(dir, "perms");
1504         if (!dentry) {
1505                 rc = -ENOMEM;
1506                 goto out;
1507         }
1508
1509         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1510         if (rc)
1511                 goto out;
1512
1513         rc = sel_make_perm_files(classname, index, dentry);
1514
1515 out:
1516         return rc;
1517 }
1518
1519 static void sel_remove_classes(void)
1520 {
1521         struct list_head *class_node;
1522
1523         list_for_each(class_node, &class_dir->d_subdirs) {
1524                 struct dentry *class_subdir = list_entry(class_node,
1525                                         struct dentry, d_u.d_child);
1526                 struct list_head *class_subdir_node;
1527
1528                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1529                         struct dentry *d = list_entry(class_subdir_node,
1530                                                 struct dentry, d_u.d_child);
1531
1532                         if (d->d_inode)
1533                                 if (d->d_inode->i_mode & S_IFDIR)
1534                                         sel_remove_entries(d);
1535                 }
1536
1537                 sel_remove_entries(class_subdir);
1538         }
1539
1540         sel_remove_entries(class_dir);
1541 }
1542
1543 static int sel_make_classes(void)
1544 {
1545         int rc = 0, nclasses, i;
1546         char **classes;
1547
1548         /* delete any existing entries */
1549         sel_remove_classes();
1550
1551         rc = security_get_classes(&classes, &nclasses);
1552         if (rc < 0)
1553                 goto out;
1554
1555         /* +2 since classes are 1-indexed */
1556         last_class_ino = sel_class_to_ino(nclasses+2);
1557
1558         for (i = 0; i < nclasses; i++) {
1559                 struct dentry *class_name_dir;
1560
1561                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1562                 if (!class_name_dir) {
1563                         rc = -ENOMEM;
1564                         goto out1;
1565                 }
1566
1567                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1568                                 &last_class_ino);
1569                 if (rc)
1570                         goto out1;
1571
1572                 /* i+1 since class values are 1-indexed */
1573                 rc = sel_make_class_dir_entries(classes[i], i+1,
1574                                 class_name_dir);
1575                 if (rc)
1576                         goto out1;
1577         }
1578
1579 out1:
1580         for (i = 0; i < nclasses; i++)
1581                 kfree(classes[i]);
1582         kfree(classes);
1583 out:
1584         return rc;
1585 }
1586
1587 static int sel_make_policycap(void)
1588 {
1589         unsigned int iter;
1590         struct dentry *dentry = NULL;
1591         struct inode *inode = NULL;
1592
1593         sel_remove_entries(policycap_dir);
1594
1595         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1596                 if (iter < ARRAY_SIZE(policycap_names))
1597                         dentry = d_alloc_name(policycap_dir,
1598                                               policycap_names[iter]);
1599                 else
1600                         dentry = d_alloc_name(policycap_dir, "unknown");
1601
1602                 if (dentry == NULL)
1603                         return -ENOMEM;
1604
1605                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1606                 if (inode == NULL)
1607                         return -ENOMEM;
1608
1609                 inode->i_fop = &sel_policycap_ops;
1610                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1611                 d_add(dentry, inode);
1612         }
1613
1614         return 0;
1615 }
1616
1617 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1618                         unsigned long *ino)
1619 {
1620         int ret = 0;
1621         struct inode *inode;
1622
1623         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1624         if (!inode) {
1625                 ret = -ENOMEM;
1626                 goto out;
1627         }
1628         inode->i_op = &simple_dir_inode_operations;
1629         inode->i_fop = &simple_dir_operations;
1630         inode->i_ino = ++(*ino);
1631         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1632         inc_nlink(inode);
1633         d_add(dentry, inode);
1634         /* bump link count on parent directory, too */
1635         inc_nlink(dir);
1636 out:
1637         return ret;
1638 }
1639
1640 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1641 {
1642         int ret;
1643         struct dentry *dentry;
1644         struct inode *inode, *root_inode;
1645         struct inode_security_struct *isec;
1646
1647         static struct tree_descr selinux_files[] = {
1648                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1649                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1650                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1651                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1652                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1653                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1654                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1655                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1656                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1657                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1658                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1659                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1660                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1661                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1662                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1663                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1664                 /* last one */ {""}
1665         };
1666         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1667         if (ret)
1668                 goto err;
1669
1670         root_inode = sb->s_root->d_inode;
1671
1672         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1673         if (!dentry) {
1674                 ret = -ENOMEM;
1675                 goto err;
1676         }
1677
1678         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1679         if (ret)
1680                 goto err;
1681
1682         bool_dir = dentry;
1683
1684         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1685         if (!dentry) {
1686                 ret = -ENOMEM;
1687                 goto err;
1688         }
1689
1690         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1691         if (!inode) {
1692                 ret = -ENOMEM;
1693                 goto err;
1694         }
1695         inode->i_ino = ++sel_last_ino;
1696         isec = (struct inode_security_struct*)inode->i_security;
1697         isec->sid = SECINITSID_DEVNULL;
1698         isec->sclass = SECCLASS_CHR_FILE;
1699         isec->initialized = 1;
1700
1701         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1702         d_add(dentry, inode);
1703         selinux_null = dentry;
1704
1705         dentry = d_alloc_name(sb->s_root, "avc");
1706         if (!dentry) {
1707                 ret = -ENOMEM;
1708                 goto err;
1709         }
1710
1711         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1712         if (ret)
1713                 goto err;
1714
1715         ret = sel_make_avc_files(dentry);
1716         if (ret)
1717                 goto err;
1718
1719         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1720         if (!dentry) {
1721                 ret = -ENOMEM;
1722                 goto err;
1723         }
1724
1725         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1726         if (ret)
1727                 goto err;
1728
1729         ret = sel_make_initcon_files(dentry);
1730         if (ret)
1731                 goto err;
1732
1733         dentry = d_alloc_name(sb->s_root, "class");
1734         if (!dentry) {
1735                 ret = -ENOMEM;
1736                 goto err;
1737         }
1738
1739         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1740         if (ret)
1741                 goto err;
1742
1743         class_dir = dentry;
1744
1745         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1746         if (!dentry) {
1747                 ret = -ENOMEM;
1748                 goto err;
1749         }
1750
1751         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1752         if (ret)
1753                 goto err;
1754
1755         policycap_dir = dentry;
1756
1757 out:
1758         return ret;
1759 err:
1760         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1761         goto out;
1762 }
1763
1764 static int sel_get_sb(struct file_system_type *fs_type,
1765                       int flags, const char *dev_name, void *data,
1766                       struct vfsmount *mnt)
1767 {
1768         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1769 }
1770
1771 static struct file_system_type sel_fs_type = {
1772         .name           = "selinuxfs",
1773         .get_sb         = sel_get_sb,
1774         .kill_sb        = kill_litter_super,
1775 };
1776
1777 struct vfsmount *selinuxfs_mount;
1778
1779 static int __init init_sel_fs(void)
1780 {
1781         int err;
1782
1783         if (!selinux_enabled)
1784                 return 0;
1785         err = register_filesystem(&sel_fs_type);
1786         if (!err) {
1787                 selinuxfs_mount = kern_mount(&sel_fs_type);
1788                 if (IS_ERR(selinuxfs_mount)) {
1789                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1790                         err = PTR_ERR(selinuxfs_mount);
1791                         selinuxfs_mount = NULL;
1792                 }
1793         }
1794         return err;
1795 }
1796
1797 __initcall(init_sel_fs);
1798
1799 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1800 void exit_sel_fs(void)
1801 {
1802         unregister_filesystem(&sel_fs_type);
1803 }
1804 #endif