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