security/selinux/selinuxfs.c

   1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
   2  *
   3  *      Added conditional policy language extensions
   4  *
   5  *  Updated: Hewlett-Packard <paul@paul-moore.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 #include <linux/kobject.h>
  32 #include <linux/ctype.h>
  33
  34 /* selinuxfs pseudo filesystem for exporting the security policy API.
  35    Based on the proc code and the fs/nfsd/nfsctl.c code. */
  36
  37 #include "flask.h"
  38 #include "avc.h"
  39 #include "avc_ss.h"
  40 #include "security.h"
  41 #include "objsec.h"
  42 #include "conditional.h"
  43
  44 /* Policy capability filenames */
  45 static char *policycap_names[] = {
  46         "network_peer_controls",
  47         "open_perms",
  48         "redhat1",
  49         "always_check_network"
  50 };
  51
  52 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
  53
  54 static int __init checkreqprot_setup(char *str)
  55 {
  56         unsigned long checkreqprot;
  57         if (!kstrtoul(str, 0, &checkreqprot))
  58                 selinux_checkreqprot = checkreqprot ? 1 : 0;
  59         return 1;
  60 }
  61 __setup("checkreqprot=", checkreqprot_setup);
  62
  63 static DEFINE_MUTEX(sel_mutex);
  64
  65 /* global data for booleans */
  66 static struct dentry *bool_dir;
  67 static int bool_num;
  68 static char **bool_pending_names;
  69 static int *bool_pending_values;
  70
  71 /* global data for classes */
  72 static struct dentry *class_dir;
  73 static unsigned long last_class_ino;
  74
  75 static char policy_opened;
  76
  77 /* global data for policy capabilities */
  78 static struct dentry *policycap_dir;
  79
  80 /* Check whether a task is allowed to use a security operation. */
  81 static int task_has_security(struct task_struct *tsk,
  82                              u32 perms)
  83 {
  84         const struct task_security_struct *tsec;
  85         u32 sid = 0;
  86
  87         rcu_read_lock();
  88         tsec = __task_cred(tsk)->security;
  89         if (tsec)
  90                 sid = tsec->sid;
  91         rcu_read_unlock();
  92         if (!tsec)
  93                 return -EACCES;
  94
  95         return avc_has_perm(sid, SECINITSID_SECURITY,
  96                             SECCLASS_SECURITY, perms, NULL);
  97 }
  98
  99 enum sel_inos {
 100         SEL_ROOT_INO = 2,
 101         SEL_LOAD,       /* load policy */
 102         SEL_ENFORCE,    /* get or set enforcing status */
 103         SEL_CONTEXT,    /* validate context */
 104         SEL_ACCESS,     /* compute access decision */
 105         SEL_CREATE,     /* compute create labeling decision */
 106         SEL_RELABEL,    /* compute relabeling decision */
 107         SEL_USER,       /* compute reachable user contexts */
 108         SEL_POLICYVERS, /* return policy version for this kernel */
 109         SEL_COMMIT_BOOLS, /* commit new boolean values */
 110         SEL_MLS,        /* return if MLS policy is enabled */
 111         SEL_DISABLE,    /* disable SELinux until next reboot */
 112         SEL_MEMBER,     /* compute polyinstantiation membership decision */
 113         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 114         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
 115         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
 116         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
 117         SEL_STATUS,     /* export current status using mmap() */
 118         SEL_POLICY,     /* allow userspace to read the in kernel policy */
 119         SEL_INO_NEXT,   /* The next inode number to use */
 120 };
 121
 122 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 123
 124 #define SEL_INITCON_INO_OFFSET          0x01000000
 125 #define SEL_BOOL_INO_OFFSET             0x02000000
 126 #define SEL_CLASS_INO_OFFSET            0x04000000
 127 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
 128 #define SEL_INO_MASK                    0x00ffffff
 129
 130 #define TMPBUFLEN       12
 131 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 132                                 size_t count, loff_t *ppos)
 133 {
 134         char tmpbuf[TMPBUFLEN];
 135         ssize_t length;
 136
 137         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 138         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 139 }
 140
 141 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 142 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 143                                  size_t count, loff_t *ppos)
 144
 145 {
 146         char *page = NULL;
 147         ssize_t length;
 148         int new_value;
 149
 150         if (count >= PAGE_SIZE)
 151                 return -ENOMEM;
 152
 153         /* No partial writes. */
 154         if (*ppos != 0)
 155                 return -EINVAL;
 156
 157         page = memdup_user_nul(buf, count);
 158         if (IS_ERR(page))
 159                 return PTR_ERR(page);
 160
 161         length = -EINVAL;
 162         if (sscanf(page, "%d", &new_value) != 1)
 163                 goto out;
 164
 165         if (new_value != selinux_enforcing) {
 166                 length = task_has_security(current, SECURITY__SETENFORCE);
 167                 if (length)
 168                         goto out;
 169                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 170                         "enforcing=%d old_enforcing=%d auid=%u ses=%u",
 171                         new_value, selinux_enforcing,
 172                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
 173                         audit_get_sessionid(current));
 174                 selinux_enforcing = new_value;
 175                 if (selinux_enforcing)
 176                         avc_ss_reset(0);
 177                 selnl_notify_setenforce(selinux_enforcing);
 178                 selinux_status_update_setenforce(selinux_enforcing);
 179         }
 180         length = count;
 181 out:
 182         kfree(page);
 183         return length;
 184 }
 185 #else
 186 #define sel_write_enforce NULL
 187 #endif
 188
 189 static const struct file_operations sel_enforce_ops = {
 190         .read           = sel_read_enforce,
 191         .write          = sel_write_enforce,
 192         .llseek         = generic_file_llseek,
 193 };
 194
 195 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 196                                         size_t count, loff_t *ppos)
 197 {
 198         char tmpbuf[TMPBUFLEN];
 199         ssize_t length;
 200         ino_t ino = file_inode(filp)->i_ino;
 201         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 202                 security_get_reject_unknown() : !security_get_allow_unknown();
 203
 204         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 205         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 206 }
 207
 208 static const struct file_operations sel_handle_unknown_ops = {
 209         .read           = sel_read_handle_unknown,
 210         .llseek         = generic_file_llseek,
 211 };
 212
 213 static int sel_open_handle_status(struct inode *inode, struct file *filp)
 214 {
 215         struct page    *status = selinux_kernel_status_page();
 216
 217         if (!status)
 218                 return -ENOMEM;
 219
 220         filp->private_data = status;
 221
 222         return 0;
 223 }
 224
 225 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
 226                                       size_t count, loff_t *ppos)
 227 {
 228         struct page    *status = filp->private_data;
 229
 230         BUG_ON(!status);
 231
 232         return simple_read_from_buffer(buf, count, ppos,
 233                                        page_address(status),
 234                                        sizeof(struct selinux_kernel_status));
 235 }
 236
 237 static int sel_mmap_handle_status(struct file *filp,
 238                                   struct vm_area_struct *vma)
 239 {
 240         struct page    *status = filp->private_data;
 241         unsigned long   size = vma->vm_end - vma->vm_start;
 242
 243         BUG_ON(!status);
 244
 245         /* only allows one page from the head */
 246         if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
 247                 return -EIO;
 248         /* disallow writable mapping */
 249         if (vma->vm_flags & VM_WRITE)
 250                 return -EPERM;
 251         /* disallow mprotect() turns it into writable */
 252         vma->vm_flags &= ~VM_MAYWRITE;
 253
 254         return remap_pfn_range(vma, vma->vm_start,
 255                                page_to_pfn(status),
 256                                size, vma->vm_page_prot);
 257 }
 258
 259 static const struct file_operations sel_handle_status_ops = {
 260         .open           = sel_open_handle_status,
 261         .read           = sel_read_handle_status,
 262         .mmap           = sel_mmap_handle_status,
 263         .llseek         = generic_file_llseek,
 264 };
 265
 266 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 267 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 268                                  size_t count, loff_t *ppos)
 269
 270 {
 271         char *page;
 272         ssize_t length;
 273         int new_value;
 274
 275         if (count >= PAGE_SIZE)
 276                 return -ENOMEM;
 277
 278         /* No partial writes. */
 279         if (*ppos != 0)
 280                 return -EINVAL;
 281
 282         page = memdup_user_nul(buf, count);
 283         if (IS_ERR(page))
 284                 return PTR_ERR(page);
 285
 286         length = -EINVAL;
 287         if (sscanf(page, "%d", &new_value) != 1)
 288                 goto out;
 289
 290         if (new_value) {
 291                 length = selinux_disable();
 292                 if (length)
 293                         goto out;
 294                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 295                         "selinux=0 auid=%u ses=%u",
 296                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
 297                         audit_get_sessionid(current));
 298         }
 299
 300         length = count;
 301 out:
 302         kfree(page);
 303         return length;
 304 }
 305 #else
 306 #define sel_write_disable NULL
 307 #endif
 308
 309 static const struct file_operations sel_disable_ops = {
 310         .write          = sel_write_disable,
 311         .llseek         = generic_file_llseek,
 312 };
 313
 314 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 315                                    size_t count, loff_t *ppos)
 316 {
 317         char tmpbuf[TMPBUFLEN];
 318         ssize_t length;
 319
 320         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 321         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 322 }
 323
 324 static const struct file_operations sel_policyvers_ops = {
 325         .read           = sel_read_policyvers,
 326         .llseek         = generic_file_llseek,
 327 };
 328
 329 /* declaration for sel_write_load */
 330 static int sel_make_bools(void);
 331 static int sel_make_classes(void);
 332 static int sel_make_policycap(void);
 333
 334 /* declaration for sel_make_class_dirs */
 335 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
 336                         unsigned long *ino);
 337
 338 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 339                                 size_t count, loff_t *ppos)
 340 {
 341         char tmpbuf[TMPBUFLEN];
 342         ssize_t length;
 343
 344         length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 345                            security_mls_enabled());
 346         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 347 }
 348
 349 static const struct file_operations sel_mls_ops = {
 350         .read           = sel_read_mls,
 351         .llseek         = generic_file_llseek,
 352 };
 353
 354 struct policy_load_memory {
 355         size_t len;
 356         void *data;
 357 };
 358
 359 static int sel_open_policy(struct inode *inode, struct file *filp)
 360 {
 361         struct policy_load_memory *plm = NULL;
 362         int rc;
 363
 364         BUG_ON(filp->private_data);
 365
 366         mutex_lock(&sel_mutex);
 367
 368         rc = task_has_security(current, SECURITY__READ_POLICY);
 369         if (rc)
 370                 goto err;
 371
 372         rc = -EBUSY;
 373         if (policy_opened)
 374                 goto err;
 375
 376         rc = -ENOMEM;
 377         plm = kzalloc(sizeof(*plm), GFP_KERNEL);
 378         if (!plm)
 379                 goto err;
 380
 381         if (i_size_read(inode) != security_policydb_len()) {
 382                 mutex_lock(&inode->i_mutex);
 383                 i_size_write(inode, security_policydb_len());
 384                 mutex_unlock(&inode->i_mutex);
 385         }
 386
 387         rc = security_read_policy(&plm->data, &plm->len);
 388         if (rc)
 389                 goto err;
 390
 391         policy_opened = 1;
 392
 393         filp->private_data = plm;
 394
 395         mutex_unlock(&sel_mutex);
 396
 397         return 0;
 398 err:
 399         mutex_unlock(&sel_mutex);
 400
 401         if (plm)
 402                 vfree(plm->data);
 403         kfree(plm);
 404         return rc;
 405 }
 406
 407 static int sel_release_policy(struct inode *inode, struct file *filp)
 408 {
 409         struct policy_load_memory *plm = filp->private_data;
 410
 411         BUG_ON(!plm);
 412
 413         policy_opened = 0;
 414
 415         vfree(plm->data);
 416         kfree(plm);
 417
 418         return 0;
 419 }
 420
 421 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
 422                                size_t count, loff_t *ppos)
 423 {
 424         struct policy_load_memory *plm = filp->private_data;
 425         int ret;
 426
 427         mutex_lock(&sel_mutex);
 428
 429         ret = task_has_security(current, SECURITY__READ_POLICY);
 430         if (ret)
 431                 goto out;
 432
 433         ret = simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 434 out:
 435         mutex_unlock(&sel_mutex);
 436         return ret;
 437 }
 438
 439 static int sel_mmap_policy_fault(struct vm_area_struct *vma,
 440                                  struct vm_fault *vmf)
 441 {
 442         struct policy_load_memory *plm = vma->vm_file->private_data;
 443         unsigned long offset;
 444         struct page *page;
 445
 446         if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
 447                 return VM_FAULT_SIGBUS;
 448
 449         offset = vmf->pgoff << PAGE_SHIFT;
 450         if (offset >= roundup(plm->len, PAGE_SIZE))
 451                 return VM_FAULT_SIGBUS;
 452
 453         page = vmalloc_to_page(plm->data + offset);
 454         get_page(page);
 455
 456         vmf->page = page;
 457
 458         return 0;
 459 }
 460
 461 static const struct vm_operations_struct sel_mmap_policy_ops = {
 462         .fault = sel_mmap_policy_fault,
 463         .page_mkwrite = sel_mmap_policy_fault,
 464 };
 465
 466 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 467 {
 468         if (vma->vm_flags & VM_SHARED) {
 469                 /* do not allow mprotect to make mapping writable */
 470                 vma->vm_flags &= ~VM_MAYWRITE;
 471
 472                 if (vma->vm_flags & VM_WRITE)
 473                         return -EACCES;
 474         }
 475
 476         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 477         vma->vm_ops = &sel_mmap_policy_ops;
 478
 479         return 0;
 480 }
 481
 482 static const struct file_operations sel_policy_ops = {
 483         .open           = sel_open_policy,
 484         .read           = sel_read_policy,
 485         .mmap           = sel_mmap_policy,
 486         .release        = sel_release_policy,
 487         .llseek         = generic_file_llseek,
 488 };
 489
 490 static ssize_t sel_write_load(struct file *file, const char __user *buf,
 491                               size_t count, loff_t *ppos)
 492
 493 {
 494         ssize_t length;
 495         void *data = NULL;
 496
 497         mutex_lock(&sel_mutex);
 498
 499         length = task_has_security(current, SECURITY__LOAD_POLICY);
 500         if (length)
 501                 goto out;
 502
 503         /* No partial writes. */
 504         length = -EINVAL;
 505         if (*ppos != 0)
 506                 goto out;
 507
 508         length = -EFBIG;
 509         if (count > 64 * 1024 * 1024)
 510                 goto out;
 511
 512         length = -ENOMEM;
 513         data = vmalloc(count);
 514         if (!data)
 515                 goto out;
 516
 517         length = -EFAULT;
 518         if (copy_from_user(data, buf, count) != 0)
 519                 goto out;
 520
 521         length = security_load_policy(data, count);
 522         if (length)
 523                 goto out;
 524
 525         length = sel_make_bools();
 526         if (length)
 527                 goto out1;
 528
 529         length = sel_make_classes();
 530         if (length)
 531                 goto out1;
 532
 533         length = sel_make_policycap();
 534         if (length)
 535                 goto out1;
 536
 537         length = count;
 538
 539 out1:
 540         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 541                 "policy loaded auid=%u ses=%u",
 542                 from_kuid(&init_user_ns, audit_get_loginuid(current)),
 543                 audit_get_sessionid(current));
 544 out:
 545         mutex_unlock(&sel_mutex);
 546         vfree(data);
 547         return length;
 548 }
 549
 550 static const struct file_operations sel_load_ops = {
 551         .write          = sel_write_load,
 552         .llseek         = generic_file_llseek,
 553 };
 554
 555 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 556 {
 557         char *canon = NULL;
 558         u32 sid, len;
 559         ssize_t length;
 560
 561         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 562         if (length)
 563                 goto out;
 564
 565         length = security_context_to_sid(buf, size, &sid, GFP_KERNEL);
 566         if (length)
 567                 goto out;
 568
 569         length = security_sid_to_context(sid, &canon, &len);
 570         if (length)
 571                 goto out;
 572
 573         length = -ERANGE;
 574         if (len > SIMPLE_TRANSACTION_LIMIT) {
 575                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 576                         "payload max\n", __func__, len);
 577                 goto out;
 578         }
 579
 580         memcpy(buf, canon, len);
 581         length = len;
 582 out:
 583         kfree(canon);
 584         return length;
 585 }
 586
 587 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 588                                      size_t count, loff_t *ppos)
 589 {
 590         char tmpbuf[TMPBUFLEN];
 591         ssize_t length;
 592
 593         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 594         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 595 }
 596
 597 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 598                                       size_t count, loff_t *ppos)
 599 {
 600         char *page;
 601         ssize_t length;
 602         unsigned int new_value;
 603
 604         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 605         if (length)
 606                 return length;
 607
 608         if (count >= PAGE_SIZE)
 609                 return -ENOMEM;
 610
 611         /* No partial writes. */
 612         if (*ppos != 0)
 613                 return -EINVAL;
 614
 615         page = memdup_user_nul(buf, count);
 616         if (IS_ERR(page))
 617                 return PTR_ERR(page);
 618
 619         length = -EINVAL;
 620         if (sscanf(page, "%u", &new_value) != 1)
 621                 goto out;
 622
 623         selinux_checkreqprot = new_value ? 1 : 0;
 624         length = count;
 625 out:
 626         kfree(page);
 627         return length;
 628 }
 629 static const struct file_operations sel_checkreqprot_ops = {
 630         .read           = sel_read_checkreqprot,
 631         .write          = sel_write_checkreqprot,
 632         .llseek         = generic_file_llseek,
 633 };
 634
 635 /*
 636  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 637  */
 638 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 639 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 640 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 641 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 642 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 643
 644 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 645         [SEL_ACCESS] = sel_write_access,
 646         [SEL_CREATE] = sel_write_create,
 647         [SEL_RELABEL] = sel_write_relabel,
 648         [SEL_USER] = sel_write_user,
 649         [SEL_MEMBER] = sel_write_member,
 650         [SEL_CONTEXT] = sel_write_context,
 651 };
 652
 653 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 654 {
 655         ino_t ino = file_inode(file)->i_ino;
 656         char *data;
 657         ssize_t rv;
 658
 659         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 660                 return -EINVAL;
 661
 662         data = simple_transaction_get(file, buf, size);
 663         if (IS_ERR(data))
 664                 return PTR_ERR(data);
 665
 666         rv = write_op[ino](file, data, size);
 667         if (rv > 0) {
 668                 simple_transaction_set(file, rv);
 669                 rv = size;
 670         }
 671         return rv;
 672 }
 673
 674 static const struct file_operations transaction_ops = {
 675         .write          = selinux_transaction_write,
 676         .read           = simple_transaction_read,
 677         .release        = simple_transaction_release,
 678         .llseek         = generic_file_llseek,
 679 };
 680
 681 /*
 682  * payload - write methods
 683  * If the method has a response, the response should be put in buf,
 684  * and the length returned.  Otherwise return 0 or and -error.
 685  */
 686
 687 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 688 {
 689         char *scon = NULL, *tcon = NULL;
 690         u32 ssid, tsid;
 691         u16 tclass;
 692         struct av_decision avd;
 693         ssize_t length;
 694
 695         length = task_has_security(current, SECURITY__COMPUTE_AV);
 696         if (length)
 697                 goto out;
 698
 699         length = -ENOMEM;
 700         scon = kzalloc(size + 1, GFP_KERNEL);
 701         if (!scon)
 702                 goto out;
 703
 704         length = -ENOMEM;
 705         tcon = kzalloc(size + 1, GFP_KERNEL);
 706         if (!tcon)
 707                 goto out;
 708
 709         length = -EINVAL;
 710         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 711                 goto out;
 712
 713         length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
 714         if (length)
 715                 goto out;
 716
 717         length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
 718         if (length)
 719                 goto out;
 720
 721         security_compute_av_user(ssid, tsid, tclass, &avd);
 722
 723         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 724                           "%x %x %x %x %u %x",
 725                           avd.allowed, 0xffffffff,
 726                           avd.auditallow, avd.auditdeny,
 727                           avd.seqno, avd.flags);
 728 out:
 729         kfree(tcon);
 730         kfree(scon);
 731         return length;
 732 }
 733
 734 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 735 {
 736         char *scon = NULL, *tcon = NULL;
 737         char *namebuf = NULL, *objname = NULL;
 738         u32 ssid, tsid, newsid;
 739         u16 tclass;
 740         ssize_t length;
 741         char *newcon = NULL;
 742         u32 len;
 743         int nargs;
 744
 745         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 746         if (length)
 747                 goto out;
 748
 749         length = -ENOMEM;
 750         scon = kzalloc(size + 1, GFP_KERNEL);
 751         if (!scon)
 752                 goto out;
 753
 754         length = -ENOMEM;
 755         tcon = kzalloc(size + 1, GFP_KERNEL);
 756         if (!tcon)
 757                 goto out;
 758
 759         length = -ENOMEM;
 760         namebuf = kzalloc(size + 1, GFP_KERNEL);
 761         if (!namebuf)
 762                 goto out;
 763
 764         length = -EINVAL;
 765         nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
 766         if (nargs < 3 || nargs > 4)
 767                 goto out;
 768         if (nargs == 4) {
 769                 /*
 770                  * If and when the name of new object to be queried contains
 771                  * either whitespace or multibyte characters, they shall be
 772                  * encoded based on the percentage-encoding rule.
 773                  * If not encoded, the sscanf logic picks up only left-half
 774                  * of the supplied name; splitted by a whitespace unexpectedly.
 775                  */
 776                 char   *r, *w;
 777                 int     c1, c2;
 778
 779                 r = w = namebuf;
 780                 do {
 781                         c1 = *r++;
 782                         if (c1 == '+')
 783                                 c1 = ' ';
 784                         else if (c1 == '%') {
 785                                 c1 = hex_to_bin(*r++);
 786                                 if (c1 < 0)
 787                                         goto out;
 788                                 c2 = hex_to_bin(*r++);
 789                                 if (c2 < 0)
 790                                         goto out;
 791                                 c1 = (c1 << 4) | c2;
 792                         }
 793                         *w++ = c1;
 794                 } while (c1 != '\0');
 795
 796                 objname = namebuf;
 797         }
 798
 799         length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
 800         if (length)
 801                 goto out;
 802
 803         length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
 804         if (length)
 805                 goto out;
 806
 807         length = security_transition_sid_user(ssid, tsid, tclass,
 808                                               objname, &newsid);
 809         if (length)
 810                 goto out;
 811
 812         length = security_sid_to_context(newsid, &newcon, &len);
 813         if (length)
 814                 goto out;
 815
 816         length = -ERANGE;
 817         if (len > SIMPLE_TRANSACTION_LIMIT) {
 818                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 819                         "payload max\n", __func__, len);
 820                 goto out;
 821         }
 822
 823         memcpy(buf, newcon, len);
 824         length = len;
 825 out:
 826         kfree(newcon);
 827         kfree(namebuf);
 828         kfree(tcon);
 829         kfree(scon);
 830         return length;
 831 }
 832
 833 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
 834 {
 835         char *scon = NULL, *tcon = NULL;
 836         u32 ssid, tsid, newsid;
 837         u16 tclass;
 838         ssize_t length;
 839         char *newcon = NULL;
 840         u32 len;
 841
 842         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 843         if (length)
 844                 goto out;
 845
 846         length = -ENOMEM;
 847         scon = kzalloc(size + 1, GFP_KERNEL);
 848         if (!scon)
 849                 goto out;
 850
 851         length = -ENOMEM;
 852         tcon = kzalloc(size + 1, GFP_KERNEL);
 853         if (!tcon)
 854                 goto out;
 855
 856         length = -EINVAL;
 857         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 858                 goto out;
 859
 860         length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
 861         if (length)
 862                 goto out;
 863
 864         length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
 865         if (length)
 866                 goto out;
 867
 868         length = security_change_sid(ssid, tsid, tclass, &newsid);
 869         if (length)
 870                 goto out;
 871
 872         length = security_sid_to_context(newsid, &newcon, &len);
 873         if (length)
 874                 goto out;
 875
 876         length = -ERANGE;
 877         if (len > SIMPLE_TRANSACTION_LIMIT)
 878                 goto out;
 879
 880         memcpy(buf, newcon, len);
 881         length = len;
 882 out:
 883         kfree(newcon);
 884         kfree(tcon);
 885         kfree(scon);
 886         return length;
 887 }
 888
 889 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
 890 {
 891         char *con = NULL, *user = NULL, *ptr;
 892         u32 sid, *sids = NULL;
 893         ssize_t length;
 894         char *newcon;
 895         int i, rc;
 896         u32 len, nsids;
 897
 898         length = task_has_security(current, SECURITY__COMPUTE_USER);
 899         if (length)
 900                 goto out;
 901
 902         length = -ENOMEM;
 903         con = kzalloc(size + 1, GFP_KERNEL);
 904         if (!con)
 905                 goto out;
 906
 907         length = -ENOMEM;
 908         user = kzalloc(size + 1, GFP_KERNEL);
 909         if (!user)
 910                 goto out;
 911
 912         length = -EINVAL;
 913         if (sscanf(buf, "%s %s", con, user) != 2)
 914                 goto out;
 915
 916         length = security_context_str_to_sid(con, &sid, GFP_KERNEL);
 917         if (length)
 918                 goto out;
 919
 920         length = security_get_user_sids(sid, user, &sids, &nsids);
 921         if (length)
 922                 goto out;
 923
 924         length = sprintf(buf, "%u", nsids) + 1;
 925         ptr = buf + length;
 926         for (i = 0; i < nsids; i++) {
 927                 rc = security_sid_to_context(sids[i], &newcon, &len);
 928                 if (rc) {
 929                         length = rc;
 930                         goto out;
 931                 }
 932                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 933                         kfree(newcon);
 934                         length = -ERANGE;
 935                         goto out;
 936                 }
 937                 memcpy(ptr, newcon, len);
 938                 kfree(newcon);
 939                 ptr += len;
 940                 length += len;
 941         }
 942 out:
 943         kfree(sids);
 944         kfree(user);
 945         kfree(con);
 946         return length;
 947 }
 948
 949 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
 950 {
 951         char *scon = NULL, *tcon = NULL;
 952         u32 ssid, tsid, newsid;
 953         u16 tclass;
 954         ssize_t length;
 955         char *newcon = NULL;
 956         u32 len;
 957
 958         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 959         if (length)
 960                 goto out;
 961
 962         length = -ENOMEM;
 963         scon = kzalloc(size + 1, GFP_KERNEL);
 964         if (!scon)
 965                 goto out;
 966
 967         length = -ENOMEM;
 968         tcon = kzalloc(size + 1, GFP_KERNEL);
 969         if (!tcon)
 970                 goto out;
 971
 972         length = -EINVAL;
 973         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 974                 goto out;
 975
 976         length = security_context_str_to_sid(scon, &ssid, GFP_KERNEL);
 977         if (length)
 978                 goto out;
 979
 980         length = security_context_str_to_sid(tcon, &tsid, GFP_KERNEL);
 981         if (length)
 982                 goto out;
 983
 984         length = security_member_sid(ssid, tsid, tclass, &newsid);
 985         if (length)
 986                 goto out;
 987
 988         length = security_sid_to_context(newsid, &newcon, &len);
 989         if (length)
 990                 goto out;
 991
 992         length = -ERANGE;
 993         if (len > SIMPLE_TRANSACTION_LIMIT) {
 994                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 995                         "payload max\n", __func__, len);
 996                 goto out;
 997         }
 998
 999         memcpy(buf, newcon, len);
1000         length = len;
1001 out:
1002         kfree(newcon);
1003         kfree(tcon);
1004         kfree(scon);
1005         return length;
1006 }
1007
1008 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1009 {
1010         struct inode *ret = new_inode(sb);
1011
1012         if (ret) {
1013                 ret->i_mode = mode;
1014                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
1015         }
1016         return ret;
1017 }
1018
1019 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1020                              size_t count, loff_t *ppos)
1021 {
1022         char *page = NULL;
1023         ssize_t length;
1024         ssize_t ret;
1025         int cur_enforcing;
1026         unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1027         const char *name = filep->f_path.dentry->d_name.name;
1028
1029         mutex_lock(&sel_mutex);
1030
1031         ret = -EINVAL;
1032         if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1033                 goto out;
1034
1035         ret = -ENOMEM;
1036         page = (char *)get_zeroed_page(GFP_KERNEL);
1037         if (!page)
1038                 goto out;
1039
1040         cur_enforcing = security_get_bool_value(index);
1041         if (cur_enforcing < 0) {
1042                 ret = cur_enforcing;
1043                 goto out;
1044         }
1045         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1046                           bool_pending_values[index]);
1047         ret = simple_read_from_buffer(buf, count, ppos, page, length);
1048 out:
1049         mutex_unlock(&sel_mutex);
1050         free_page((unsigned long)page);
1051         return ret;
1052 }
1053
1054 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1055                               size_t count, loff_t *ppos)
1056 {
1057         char *page = NULL;
1058         ssize_t length;
1059         int new_value;
1060         unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1061         const char *name = filep->f_path.dentry->d_name.name;
1062
1063         mutex_lock(&sel_mutex);
1064
1065         length = task_has_security(current, SECURITY__SETBOOL);
1066         if (length)
1067                 goto out;
1068
1069         length = -EINVAL;
1070         if (index >= bool_num || strcmp(name, bool_pending_names[index]))
1071                 goto out;
1072
1073         length = -ENOMEM;
1074         if (count >= PAGE_SIZE)
1075                 goto out;
1076
1077         /* No partial writes. */
1078         length = -EINVAL;
1079         if (*ppos != 0)
1080                 goto out;
1081
1082         page = memdup_user_nul(buf, count);
1083         if (IS_ERR(page)) {
1084                 length = PTR_ERR(page);
1085                 page = NULL;
1086                 goto out;
1087         }
1088
1089         length = -EINVAL;
1090         if (sscanf(page, "%d", &new_value) != 1)
1091                 goto out;
1092
1093         if (new_value)
1094                 new_value = 1;
1095
1096         bool_pending_values[index] = new_value;
1097         length = count;
1098
1099 out:
1100         mutex_unlock(&sel_mutex);
1101         kfree(page);
1102         return length;
1103 }
1104
1105 static const struct file_operations sel_bool_ops = {
1106         .read           = sel_read_bool,
1107         .write          = sel_write_bool,
1108         .llseek         = generic_file_llseek,
1109 };
1110
1111 static ssize_t sel_commit_bools_write(struct file *filep,
1112                                       const char __user *buf,
1113                                       size_t count, loff_t *ppos)
1114 {
1115         char *page = NULL;
1116         ssize_t length;
1117         int new_value;
1118
1119         mutex_lock(&sel_mutex);
1120
1121         length = task_has_security(current, SECURITY__SETBOOL);
1122         if (length)
1123                 goto out;
1124
1125         length = -ENOMEM;
1126         if (count >= PAGE_SIZE)
1127                 goto out;
1128
1129         /* No partial writes. */
1130         length = -EINVAL;
1131         if (*ppos != 0)
1132                 goto out;
1133
1134         page = memdup_user_nul(buf, count);
1135         if (IS_ERR(page)) {
1136                 length = PTR_ERR(page);
1137                 page = NULL;
1138                 goto out;
1139         }
1140
1141         length = -EINVAL;
1142         if (sscanf(page, "%d", &new_value) != 1)
1143                 goto out;
1144
1145         length = 0;
1146         if (new_value && bool_pending_values)
1147                 length = security_set_bools(bool_num, bool_pending_values);
1148
1149         if (!length)
1150                 length = count;
1151
1152 out:
1153         mutex_unlock(&sel_mutex);
1154         kfree(page);
1155         return length;
1156 }
1157
1158 static const struct file_operations sel_commit_bools_ops = {
1159         .write          = sel_commit_bools_write,
1160         .llseek         = generic_file_llseek,
1161 };
1162
1163 static void sel_remove_entries(struct dentry *de)
1164 {
1165         d_genocide(de);
1166         shrink_dcache_parent(de);
1167 }
1168
1169 #define BOOL_DIR_NAME "booleans"
1170
1171 static int sel_make_bools(void)
1172 {
1173         int i, ret;
1174         ssize_t len;
1175         struct dentry *dentry = NULL;
1176         struct dentry *dir = bool_dir;
1177         struct inode *inode = NULL;
1178         struct inode_security_struct *isec;
1179         char **names = NULL, *page;
1180         int num;
1181         int *values = NULL;
1182         u32 sid;
1183
1184         /* remove any existing files */
1185         for (i = 0; i < bool_num; i++)
1186                 kfree(bool_pending_names[i]);
1187         kfree(bool_pending_names);
1188         kfree(bool_pending_values);
1189         bool_num = 0;
1190         bool_pending_names = NULL;
1191         bool_pending_values = NULL;
1192
1193         sel_remove_entries(dir);
1194
1195         ret = -ENOMEM;
1196         page = (char *)get_zeroed_page(GFP_KERNEL);
1197         if (!page)
1198                 goto out;
1199
1200         ret = security_get_bools(&num, &names, &values);
1201         if (ret)
1202                 goto out;
1203
1204         for (i = 0; i < num; i++) {
1205                 ret = -ENOMEM;
1206                 dentry = d_alloc_name(dir, names[i]);
1207                 if (!dentry)
1208                         goto out;
1209
1210                 ret = -ENOMEM;
1211                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1212                 if (!inode)
1213                         goto out;
1214
1215                 ret = -ENAMETOOLONG;
1216                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1217                 if (len >= PAGE_SIZE)
1218                         goto out;
1219
1220                 isec = (struct inode_security_struct *)inode->i_security;
1221                 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1222                 if (ret)
1223                         goto out;
1224
1225                 isec->sid = sid;
1226                 isec->initialized = 1;
1227                 inode->i_fop = &sel_bool_ops;
1228                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1229                 d_add(dentry, inode);
1230         }
1231         bool_num = num;
1232         bool_pending_names = names;
1233         bool_pending_values = values;
1234
1235         free_page((unsigned long)page);
1236         return 0;
1237 out:
1238         free_page((unsigned long)page);
1239
1240         if (names) {
1241                 for (i = 0; i < num; i++)
1242                         kfree(names[i]);
1243                 kfree(names);
1244         }
1245         kfree(values);
1246         sel_remove_entries(dir);
1247
1248         return ret;
1249 }
1250
1251 #define NULL_FILE_NAME "null"
1252
1253 struct path selinux_null;
1254
1255 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1256                                             size_t count, loff_t *ppos)
1257 {
1258         char tmpbuf[TMPBUFLEN];
1259         ssize_t length;
1260
1261         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1262         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1263 }
1264
1265 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1266                                              const char __user *buf,
1267                                              size_t count, loff_t *ppos)
1268
1269 {
1270         char *page;
1271         ssize_t ret;
1272         int new_value;
1273
1274         ret = task_has_security(current, SECURITY__SETSECPARAM);
1275         if (ret)
1276                 return ret;
1277
1278         if (count >= PAGE_SIZE)
1279                 return -ENOMEM;
1280
1281         /* No partial writes. */
1282         if (*ppos != 0)
1283                 return -EINVAL;
1284
1285         page = memdup_user_nul(buf, count);
1286         if (IS_ERR(page))
1287                 return PTR_ERR(page);
1288
1289         ret = -EINVAL;
1290         if (sscanf(page, "%u", &new_value) != 1)
1291                 goto out;
1292
1293         avc_cache_threshold = new_value;
1294
1295         ret = count;
1296 out:
1297         kfree(page);
1298         return ret;
1299 }
1300
1301 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1302                                        size_t count, loff_t *ppos)
1303 {
1304         char *page;
1305         ssize_t length;
1306
1307         page = (char *)__get_free_page(GFP_KERNEL);
1308         if (!page)
1309                 return -ENOMEM;
1310
1311         length = avc_get_hash_stats(page);
1312         if (length >= 0)
1313                 length = simple_read_from_buffer(buf, count, ppos, page, length);
1314         free_page((unsigned long)page);
1315
1316         return length;
1317 }
1318
1319 static const struct file_operations sel_avc_cache_threshold_ops = {
1320         .read           = sel_read_avc_cache_threshold,
1321         .write          = sel_write_avc_cache_threshold,
1322         .llseek         = generic_file_llseek,
1323 };
1324
1325 static const struct file_operations sel_avc_hash_stats_ops = {
1326         .read           = sel_read_avc_hash_stats,
1327         .llseek         = generic_file_llseek,
1328 };
1329
1330 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1331 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1332 {
1333         int cpu;
1334
1335         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1336                 if (!cpu_possible(cpu))
1337                         continue;
1338                 *idx = cpu + 1;
1339                 return &per_cpu(avc_cache_stats, cpu);
1340         }
1341         return NULL;
1342 }
1343
1344 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1345 {
1346         loff_t n = *pos - 1;
1347
1348         if (*pos == 0)
1349                 return SEQ_START_TOKEN;
1350
1351         return sel_avc_get_stat_idx(&n);
1352 }
1353
1354 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1355 {
1356         return sel_avc_get_stat_idx(pos);
1357 }
1358
1359 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1360 {
1361         struct avc_cache_stats *st = v;
1362
1363         if (v == SEQ_START_TOKEN)
1364                 seq_printf(seq, "lookups hits misses allocations reclaims "
1365                            "frees\n");
1366         else {
1367                 unsigned int lookups = st->lookups;
1368                 unsigned int misses = st->misses;
1369                 unsigned int hits = lookups - misses;
1370                 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1371                            hits, misses, st->allocations,
1372                            st->reclaims, st->frees);
1373         }
1374         return 0;
1375 }
1376
1377 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1378 { }
1379
1380 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1381         .start          = sel_avc_stats_seq_start,
1382         .next           = sel_avc_stats_seq_next,
1383         .show           = sel_avc_stats_seq_show,
1384         .stop           = sel_avc_stats_seq_stop,
1385 };
1386
1387 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1388 {
1389         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1390 }
1391
1392 static const struct file_operations sel_avc_cache_stats_ops = {
1393         .open           = sel_open_avc_cache_stats,
1394         .read           = seq_read,
1395         .llseek         = seq_lseek,
1396         .release        = seq_release,
1397 };
1398 #endif
1399
1400 static int sel_make_avc_files(struct dentry *dir)
1401 {
1402         int i;
1403         static struct tree_descr files[] = {
1404                 { "cache_threshold",
1405                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1406                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1407 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1408                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1409 #endif
1410         };
1411
1412         for (i = 0; i < ARRAY_SIZE(files); i++) {
1413                 struct inode *inode;
1414                 struct dentry *dentry;
1415
1416                 dentry = d_alloc_name(dir, files[i].name);
1417                 if (!dentry)
1418                         return -ENOMEM;
1419
1420                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1421                 if (!inode)
1422                         return -ENOMEM;
1423
1424                 inode->i_fop = files[i].ops;
1425                 inode->i_ino = ++sel_last_ino;
1426                 d_add(dentry, inode);
1427         }
1428
1429         return 0;
1430 }
1431
1432 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1433                                 size_t count, loff_t *ppos)
1434 {
1435         char *con;
1436         u32 sid, len;
1437         ssize_t ret;
1438
1439         sid = file_inode(file)->i_ino&SEL_INO_MASK;
1440         ret = security_sid_to_context(sid, &con, &len);
1441         if (ret)
1442                 return ret;
1443
1444         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1445         kfree(con);
1446         return ret;
1447 }
1448
1449 static const struct file_operations sel_initcon_ops = {
1450         .read           = sel_read_initcon,
1451         .llseek         = generic_file_llseek,
1452 };
1453
1454 static int sel_make_initcon_files(struct dentry *dir)
1455 {
1456         int i;
1457
1458         for (i = 1; i <= SECINITSID_NUM; i++) {
1459                 struct inode *inode;
1460                 struct dentry *dentry;
1461                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1462                 if (!dentry)
1463                         return -ENOMEM;
1464
1465                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1466                 if (!inode)
1467                         return -ENOMEM;
1468
1469                 inode->i_fop = &sel_initcon_ops;
1470                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1471                 d_add(dentry, inode);
1472         }
1473
1474         return 0;
1475 }
1476
1477 static inline unsigned long sel_class_to_ino(u16 class)
1478 {
1479         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1480 }
1481
1482 static inline u16 sel_ino_to_class(unsigned long ino)
1483 {
1484         return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1485 }
1486
1487 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1488 {
1489         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1490 }
1491
1492 static inline u32 sel_ino_to_perm(unsigned long ino)
1493 {
1494         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1495 }
1496
1497 static ssize_t sel_read_class(struct file *file, char __user *buf,
1498                                 size_t count, loff_t *ppos)
1499 {
1500         unsigned long ino = file_inode(file)->i_ino;
1501         char res[TMPBUFLEN];
1502         ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1503         return simple_read_from_buffer(buf, count, ppos, res, len);
1504 }
1505
1506 static const struct file_operations sel_class_ops = {
1507         .read           = sel_read_class,
1508         .llseek         = generic_file_llseek,
1509 };
1510
1511 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1512                                 size_t count, loff_t *ppos)
1513 {
1514         unsigned long ino = file_inode(file)->i_ino;
1515         char res[TMPBUFLEN];
1516         ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1517         return simple_read_from_buffer(buf, count, ppos, res, len);
1518 }
1519
1520 static const struct file_operations sel_perm_ops = {
1521         .read           = sel_read_perm,
1522         .llseek         = generic_file_llseek,
1523 };
1524
1525 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1526                                   size_t count, loff_t *ppos)
1527 {
1528         int value;
1529         char tmpbuf[TMPBUFLEN];
1530         ssize_t length;
1531         unsigned long i_ino = file_inode(file)->i_ino;
1532
1533         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1534         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1535
1536         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1537 }
1538
1539 static const struct file_operations sel_policycap_ops = {
1540         .read           = sel_read_policycap,
1541         .llseek         = generic_file_llseek,
1542 };
1543
1544 static int sel_make_perm_files(char *objclass, int classvalue,
1545                                 struct dentry *dir)
1546 {
1547         int i, rc, nperms;
1548         char **perms;
1549
1550         rc = security_get_permissions(objclass, &perms, &nperms);
1551         if (rc)
1552                 return rc;
1553
1554         for (i = 0; i < nperms; i++) {
1555                 struct inode *inode;
1556                 struct dentry *dentry;
1557
1558                 rc = -ENOMEM;
1559                 dentry = d_alloc_name(dir, perms[i]);
1560                 if (!dentry)
1561                         goto out;
1562
1563                 rc = -ENOMEM;
1564                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1565                 if (!inode)
1566                         goto out;
1567
1568                 inode->i_fop = &sel_perm_ops;
1569                 /* i+1 since perm values are 1-indexed */
1570                 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1571                 d_add(dentry, inode);
1572         }
1573         rc = 0;
1574 out:
1575         for (i = 0; i < nperms; i++)
1576                 kfree(perms[i]);
1577         kfree(perms);
1578         return rc;
1579 }
1580
1581 static int sel_make_class_dir_entries(char *classname, int index,
1582                                         struct dentry *dir)
1583 {
1584         struct dentry *dentry = NULL;
1585         struct inode *inode = NULL;
1586         int rc;
1587
1588         dentry = d_alloc_name(dir, "index");
1589         if (!dentry)
1590                 return -ENOMEM;
1591
1592         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1593         if (!inode)
1594                 return -ENOMEM;
1595
1596         inode->i_fop = &sel_class_ops;
1597         inode->i_ino = sel_class_to_ino(index);
1598         d_add(dentry, inode);
1599
1600         dentry = sel_make_dir(dir, "perms", &last_class_ino);
1601         if (IS_ERR(dentry))
1602                 return PTR_ERR(dentry);
1603
1604         rc = sel_make_perm_files(classname, index, dentry);
1605
1606         return rc;
1607 }
1608
1609 static int sel_make_classes(void)
1610 {
1611         int rc, nclasses, i;
1612         char **classes;
1613
1614         /* delete any existing entries */
1615         sel_remove_entries(class_dir);
1616
1617         rc = security_get_classes(&classes, &nclasses);
1618         if (rc)
1619                 return rc;
1620
1621         /* +2 since classes are 1-indexed */
1622         last_class_ino = sel_class_to_ino(nclasses + 2);
1623
1624         for (i = 0; i < nclasses; i++) {
1625                 struct dentry *class_name_dir;
1626
1627                 class_name_dir = sel_make_dir(class_dir, classes[i],
1628                                 &last_class_ino);
1629                 if (IS_ERR(class_name_dir)) {
1630                         rc = PTR_ERR(class_name_dir);
1631                         goto out;
1632                 }
1633
1634                 /* i+1 since class values are 1-indexed */
1635                 rc = sel_make_class_dir_entries(classes[i], i + 1,
1636                                 class_name_dir);
1637                 if (rc)
1638                         goto out;
1639         }
1640         rc = 0;
1641 out:
1642         for (i = 0; i < nclasses; i++)
1643                 kfree(classes[i]);
1644         kfree(classes);
1645         return rc;
1646 }
1647
1648 static int sel_make_policycap(void)
1649 {
1650         unsigned int iter;
1651         struct dentry *dentry = NULL;
1652         struct inode *inode = NULL;
1653
1654         sel_remove_entries(policycap_dir);
1655
1656         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1657                 if (iter < ARRAY_SIZE(policycap_names))
1658                         dentry = d_alloc_name(policycap_dir,
1659                                               policycap_names[iter]);
1660                 else
1661                         dentry = d_alloc_name(policycap_dir, "unknown");
1662
1663                 if (dentry == NULL)
1664                         return -ENOMEM;
1665
1666                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1667                 if (inode == NULL)
1668                         return -ENOMEM;
1669
1670                 inode->i_fop = &sel_policycap_ops;
1671                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1672                 d_add(dentry, inode);
1673         }
1674
1675         return 0;
1676 }
1677
1678 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1679                         unsigned long *ino)
1680 {
1681         struct dentry *dentry = d_alloc_name(dir, name);
1682         struct inode *inode;
1683
1684         if (!dentry)
1685                 return ERR_PTR(-ENOMEM);
1686
1687         inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1688         if (!inode) {
1689                 dput(dentry);
1690                 return ERR_PTR(-ENOMEM);
1691         }
1692
1693         inode->i_op = &simple_dir_inode_operations;
1694         inode->i_fop = &simple_dir_operations;
1695         inode->i_ino = ++(*ino);
1696         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1697         inc_nlink(inode);
1698         d_add(dentry, inode);
1699         /* bump link count on parent directory, too */
1700         inc_nlink(d_inode(dir));
1701
1702         return dentry;
1703 }
1704
1705 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1706 {
1707         int ret;
1708         struct dentry *dentry;
1709         struct inode *inode;
1710         struct inode_security_struct *isec;
1711
1712         static struct tree_descr selinux_files[] = {
1713                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1714                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1715                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1716                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1717                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1718                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1719                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1720                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1721                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1722                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1723                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1724                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1725                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1726                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1727                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1728                 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1729                 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1730                 /* last one */ {""}
1731         };
1732         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1733         if (ret)
1734                 goto err;
1735
1736         bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &sel_last_ino);
1737         if (IS_ERR(bool_dir)) {
1738                 ret = PTR_ERR(bool_dir);
1739                 bool_dir = NULL;
1740                 goto err;
1741         }
1742
1743         ret = -ENOMEM;
1744         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1745         if (!dentry)
1746                 goto err;
1747
1748         ret = -ENOMEM;
1749         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1750         if (!inode)
1751                 goto err;
1752
1753         inode->i_ino = ++sel_last_ino;
1754         isec = (struct inode_security_struct *)inode->i_security;
1755         isec->sid = SECINITSID_DEVNULL;
1756         isec->sclass = SECCLASS_CHR_FILE;
1757         isec->initialized = 1;
1758
1759         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1760         d_add(dentry, inode);
1761         selinux_null.dentry = dentry;
1762
1763         dentry = sel_make_dir(sb->s_root, "avc", &sel_last_ino);
1764         if (IS_ERR(dentry)) {
1765                 ret = PTR_ERR(dentry);
1766                 goto err;
1767         }
1768
1769         ret = sel_make_avc_files(dentry);
1770         if (ret)
1771                 goto err;
1772
1773         dentry = sel_make_dir(sb->s_root, "initial_contexts", &sel_last_ino);
1774         if (IS_ERR(dentry)) {
1775                 ret = PTR_ERR(dentry);
1776                 goto err;
1777         }
1778
1779         ret = sel_make_initcon_files(dentry);
1780         if (ret)
1781                 goto err;
1782
1783         class_dir = sel_make_dir(sb->s_root, "class", &sel_last_ino);
1784         if (IS_ERR(class_dir)) {
1785                 ret = PTR_ERR(class_dir);
1786                 class_dir = NULL;
1787                 goto err;
1788         }
1789
1790         policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities", &sel_last_ino);
1791         if (IS_ERR(policycap_dir)) {
1792                 ret = PTR_ERR(policycap_dir);
1793                 policycap_dir = NULL;
1794                 goto err;
1795         }
1796         return 0;
1797 err:
1798         printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1799                 __func__);
1800         return ret;
1801 }
1802
1803 static struct dentry *sel_mount(struct file_system_type *fs_type,
1804                       int flags, const char *dev_name, void *data)
1805 {
1806         return mount_single(fs_type, flags, data, sel_fill_super);
1807 }
1808
1809 static struct file_system_type sel_fs_type = {
1810         .name           = "selinuxfs",
1811         .mount          = sel_mount,
1812         .kill_sb        = kill_litter_super,
1813 };
1814
1815 struct vfsmount *selinuxfs_mount;
1816
1817 static int __init init_sel_fs(void)
1818 {
1819         int err;
1820
1821         if (!selinux_enabled)
1822                 return 0;
1823
1824         err = sysfs_create_mount_point(fs_kobj, "selinux");
1825         if (err)
1826                 return err;
1827
1828         err = register_filesystem(&sel_fs_type);
1829         if (err) {
1830                 sysfs_remove_mount_point(fs_kobj, "selinux");
1831                 return err;
1832         }
1833
1834         selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
1835         if (IS_ERR(selinuxfs_mount)) {
1836                 printk(KERN_ERR "selinuxfs:  could not mount!\n");
1837                 err = PTR_ERR(selinuxfs_mount);
1838                 selinuxfs_mount = NULL;
1839         }
1840
1841         return err;
1842 }
1843
1844 __initcall(init_sel_fs);
1845
1846 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1847 void exit_sel_fs(void)
1848 {
1849         sysfs_remove_mount_point(fs_kobj, "selinux");
1850         kern_unmount(selinuxfs_mount);
1851         unregister_filesystem(&sel_fs_type);
1852 }
1853 #endif