security/selinux/selinuxfs.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
   3  *
   4  *      Added conditional policy language extensions
   5  *
   6  *  Updated: Hewlett-Packard <paul@paul-moore.com>
   7  *
   8  *      Added support for the policy capability bitmap
   9  *
  10  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  11  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  12  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/slab.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/fs.h>
  20 #include <linux/fs_context.h>
  21 #include <linux/mount.h>
  22 #include <linux/mutex.h>
  23 #include <linux/namei.h>
  24 #include <linux/init.h>
  25 #include <linux/string.h>
  26 #include <linux/security.h>
  27 #include <linux/major.h>
  28 #include <linux/seq_file.h>
  29 #include <linux/percpu.h>
  30 #include <linux/audit.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/kobject.h>
  33 #include <linux/ctype.h>
  34
  35 /* selinuxfs pseudo filesystem for exporting the security policy API.
  36    Based on the proc code and the fs/nfsd/nfsctl.c code. */
  37
  38 #include "flask.h"
  39 #include "avc.h"
  40 #include "avc_ss.h"
  41 #include "security.h"
  42 #include "objsec.h"
  43 #include "conditional.h"
  44
  45 enum sel_inos {
  46         SEL_ROOT_INO = 2,
  47         SEL_LOAD,       /* load policy */
  48         SEL_ENFORCE,    /* get or set enforcing status */
  49         SEL_CONTEXT,    /* validate context */
  50         SEL_ACCESS,     /* compute access decision */
  51         SEL_CREATE,     /* compute create labeling decision */
  52         SEL_RELABEL,    /* compute relabeling decision */
  53         SEL_USER,       /* compute reachable user contexts */
  54         SEL_POLICYVERS, /* return policy version for this kernel */
  55         SEL_COMMIT_BOOLS, /* commit new boolean values */
  56         SEL_MLS,        /* return if MLS policy is enabled */
  57         SEL_DISABLE,    /* disable SELinux until next reboot */
  58         SEL_MEMBER,     /* compute polyinstantiation membership decision */
  59         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
  60         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
  61         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
  62         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
  63         SEL_STATUS,     /* export current status using mmap() */
  64         SEL_POLICY,     /* allow userspace to read the in kernel policy */
  65         SEL_VALIDATE_TRANS, /* compute validatetrans decision */
  66         SEL_INO_NEXT,   /* The next inode number to use */
  67 };
  68
  69 struct selinux_fs_info {
  70         struct dentry *bool_dir;
  71         unsigned int bool_num;
  72         char **bool_pending_names;
  73         unsigned int *bool_pending_values;
  74         struct dentry *class_dir;
  75         unsigned long last_class_ino;
  76         bool policy_opened;
  77         struct dentry *policycap_dir;
  78         unsigned long last_ino;
  79         struct selinux_state *state;
  80         struct super_block *sb;
  81 };
  82
  83 static int selinux_fs_info_create(struct super_block *sb)
  84 {
  85         struct selinux_fs_info *fsi;
  86
  87         fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
  88         if (!fsi)
  89                 return -ENOMEM;
  90
  91         fsi->last_ino = SEL_INO_NEXT - 1;
  92         fsi->state = &selinux_state;
  93         fsi->sb = sb;
  94         sb->s_fs_info = fsi;
  95         return 0;
  96 }
  97
  98 static void selinux_fs_info_free(struct super_block *sb)
  99 {
 100         struct selinux_fs_info *fsi = sb->s_fs_info;
 101         int i;
 102
 103         if (fsi) {
 104                 for (i = 0; i < fsi->bool_num; i++)
 105                         kfree(fsi->bool_pending_names[i]);
 106                 kfree(fsi->bool_pending_names);
 107                 kfree(fsi->bool_pending_values);
 108         }
 109         kfree(sb->s_fs_info);
 110         sb->s_fs_info = NULL;
 111 }
 112
 113 #define SEL_INITCON_INO_OFFSET          0x01000000
 114 #define SEL_BOOL_INO_OFFSET             0x02000000
 115 #define SEL_CLASS_INO_OFFSET            0x04000000
 116 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
 117 #define SEL_INO_MASK                    0x00ffffff
 118
 119 #define BOOL_DIR_NAME "booleans"
 120 #define CLASS_DIR_NAME "class"
 121 #define POLICYCAP_DIR_NAME "policy_capabilities"
 122
 123 #define TMPBUFLEN       12
 124 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 125                                 size_t count, loff_t *ppos)
 126 {
 127         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 128         char tmpbuf[TMPBUFLEN];
 129         ssize_t length;
 130
 131         length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 132                            enforcing_enabled(fsi->state));
 133         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 134 }
 135
 136 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 137 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 138                                  size_t count, loff_t *ppos)
 139
 140 {
 141         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 142         struct selinux_state *state = fsi->state;
 143         char *page = NULL;
 144         ssize_t length;
 145         int old_value, new_value;
 146
 147         if (count >= PAGE_SIZE)
 148                 return -ENOMEM;
 149
 150         /* No partial writes. */
 151         if (*ppos != 0)
 152                 return -EINVAL;
 153
 154         page = memdup_user_nul(buf, count);
 155         if (IS_ERR(page))
 156                 return PTR_ERR(page);
 157
 158         length = -EINVAL;
 159         if (sscanf(page, "%d", &new_value) != 1)
 160                 goto out;
 161
 162         new_value = !!new_value;
 163
 164         old_value = enforcing_enabled(state);
 165         if (new_value != old_value) {
 166                 length = avc_has_perm(&selinux_state,
 167                                       current_sid(), SECINITSID_SECURITY,
 168                                       SECCLASS_SECURITY, SECURITY__SETENFORCE,
 169                                       NULL);
 170                 if (length)
 171                         goto out;
 172                 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 173                         "enforcing=%d old_enforcing=%d auid=%u ses=%u"
 174                         " enabled=1 old-enabled=1 lsm=selinux res=1",
 175                         new_value, old_value,
 176                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
 177                         audit_get_sessionid(current));
 178                 enforcing_set(state, new_value);
 179                 if (new_value)
 180                         avc_ss_reset(state->avc, 0);
 181                 selnl_notify_setenforce(new_value);
 182                 selinux_status_update_setenforce(state, new_value);
 183                 if (!new_value)
 184                         call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
 185         }
 186         length = count;
 187 out:
 188         kfree(page);
 189         return length;
 190 }
 191 #else
 192 #define sel_write_enforce NULL
 193 #endif
 194
 195 static const struct file_operations sel_enforce_ops = {
 196         .read           = sel_read_enforce,
 197         .write          = sel_write_enforce,
 198         .llseek         = generic_file_llseek,
 199 };
 200
 201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 202                                         size_t count, loff_t *ppos)
 203 {
 204         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 205         struct selinux_state *state = fsi->state;
 206         char tmpbuf[TMPBUFLEN];
 207         ssize_t length;
 208         ino_t ino = file_inode(filp)->i_ino;
 209         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 210                 security_get_reject_unknown(state) :
 211                 !security_get_allow_unknown(state);
 212
 213         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 214         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 215 }
 216
 217 static const struct file_operations sel_handle_unknown_ops = {
 218         .read           = sel_read_handle_unknown,
 219         .llseek         = generic_file_llseek,
 220 };
 221
 222 static int sel_open_handle_status(struct inode *inode, struct file *filp)
 223 {
 224         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 225         struct page    *status = selinux_kernel_status_page(fsi->state);
 226
 227         if (!status)
 228                 return -ENOMEM;
 229
 230         filp->private_data = status;
 231
 232         return 0;
 233 }
 234
 235 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
 236                                       size_t count, loff_t *ppos)
 237 {
 238         struct page    *status = filp->private_data;
 239
 240         BUG_ON(!status);
 241
 242         return simple_read_from_buffer(buf, count, ppos,
 243                                        page_address(status),
 244                                        sizeof(struct selinux_kernel_status));
 245 }
 246
 247 static int sel_mmap_handle_status(struct file *filp,
 248                                   struct vm_area_struct *vma)
 249 {
 250         struct page    *status = filp->private_data;
 251         unsigned long   size = vma->vm_end - vma->vm_start;
 252
 253         BUG_ON(!status);
 254
 255         /* only allows one page from the head */
 256         if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
 257                 return -EIO;
 258         /* disallow writable mapping */
 259         if (vma->vm_flags & VM_WRITE)
 260                 return -EPERM;
 261         /* disallow mprotect() turns it into writable */
 262         vma->vm_flags &= ~VM_MAYWRITE;
 263
 264         return remap_pfn_range(vma, vma->vm_start,
 265                                page_to_pfn(status),
 266                                size, vma->vm_page_prot);
 267 }
 268
 269 static const struct file_operations sel_handle_status_ops = {
 270         .open           = sel_open_handle_status,
 271         .read           = sel_read_handle_status,
 272         .mmap           = sel_mmap_handle_status,
 273         .llseek         = generic_file_llseek,
 274 };
 275
 276 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 277 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 278                                  size_t count, loff_t *ppos)
 279
 280 {
 281         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 282         char *page;
 283         ssize_t length;
 284         int new_value;
 285         int enforcing;
 286
 287         /* NOTE: we are now officially considering runtime disable as
 288          *       deprecated, and using it will become increasingly painful
 289          *       (e.g. sleeping/blocking) as we progress through future
 290          *       kernel releases until eventually it is removed
 291          */
 292         pr_err("SELinux:  Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
 293
 294         if (count >= PAGE_SIZE)
 295                 return -ENOMEM;
 296
 297         /* No partial writes. */
 298         if (*ppos != 0)
 299                 return -EINVAL;
 300
 301         page = memdup_user_nul(buf, count);
 302         if (IS_ERR(page))
 303                 return PTR_ERR(page);
 304
 305         length = -EINVAL;
 306         if (sscanf(page, "%d", &new_value) != 1)
 307                 goto out;
 308
 309         if (new_value) {
 310                 enforcing = enforcing_enabled(fsi->state);
 311                 length = selinux_disable(fsi->state);
 312                 if (length)
 313                         goto out;
 314                 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 315                         "enforcing=%d old_enforcing=%d auid=%u ses=%u"
 316                         " enabled=0 old-enabled=1 lsm=selinux res=1",
 317                         enforcing, enforcing,
 318                         from_kuid(&init_user_ns, audit_get_loginuid(current)),
 319                         audit_get_sessionid(current));
 320         }
 321
 322         length = count;
 323 out:
 324         kfree(page);
 325         return length;
 326 }
 327 #else
 328 #define sel_write_disable NULL
 329 #endif
 330
 331 static const struct file_operations sel_disable_ops = {
 332         .write          = sel_write_disable,
 333         .llseek         = generic_file_llseek,
 334 };
 335
 336 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 337                                    size_t count, loff_t *ppos)
 338 {
 339         char tmpbuf[TMPBUFLEN];
 340         ssize_t length;
 341
 342         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 343         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 344 }
 345
 346 static const struct file_operations sel_policyvers_ops = {
 347         .read           = sel_read_policyvers,
 348         .llseek         = generic_file_llseek,
 349 };
 350
 351 /* declaration for sel_write_load */
 352 static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
 353                           unsigned int *bool_num, char ***bool_pending_names,
 354                           unsigned int **bool_pending_values);
 355 static int sel_make_classes(struct selinux_policy *newpolicy,
 356                             struct dentry *class_dir,
 357                             unsigned long *last_class_ino);
 358
 359 /* declaration for sel_make_class_dirs */
 360 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
 361                         unsigned long *ino);
 362
 363 /* declaration for sel_make_policy_nodes */
 364 static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
 365                                                 unsigned long *ino);
 366
 367 /* declaration for sel_make_policy_nodes */
 368 static void sel_remove_entries(struct dentry *de);
 369
 370 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 371                                 size_t count, loff_t *ppos)
 372 {
 373         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 374         char tmpbuf[TMPBUFLEN];
 375         ssize_t length;
 376
 377         length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
 378                            security_mls_enabled(fsi->state));
 379         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 380 }
 381
 382 static const struct file_operations sel_mls_ops = {
 383         .read           = sel_read_mls,
 384         .llseek         = generic_file_llseek,
 385 };
 386
 387 struct policy_load_memory {
 388         size_t len;
 389         void *data;
 390 };
 391
 392 static int sel_open_policy(struct inode *inode, struct file *filp)
 393 {
 394         struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 395         struct selinux_state *state = fsi->state;
 396         struct policy_load_memory *plm = NULL;
 397         int rc;
 398
 399         BUG_ON(filp->private_data);
 400
 401         mutex_lock(&fsi->state->policy_mutex);
 402
 403         rc = avc_has_perm(&selinux_state,
 404                           current_sid(), SECINITSID_SECURITY,
 405                           SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 406         if (rc)
 407                 goto err;
 408
 409         rc = -EBUSY;
 410         if (fsi->policy_opened)
 411                 goto err;
 412
 413         rc = -ENOMEM;
 414         plm = kzalloc(sizeof(*plm), GFP_KERNEL);
 415         if (!plm)
 416                 goto err;
 417
 418         rc = security_read_policy(state, &plm->data, &plm->len);
 419         if (rc)
 420                 goto err;
 421
 422         if ((size_t)i_size_read(inode) != plm->len) {
 423                 inode_lock(inode);
 424                 i_size_write(inode, plm->len);
 425                 inode_unlock(inode);
 426         }
 427
 428         fsi->policy_opened = 1;
 429
 430         filp->private_data = plm;
 431
 432         mutex_unlock(&fsi->state->policy_mutex);
 433
 434         return 0;
 435 err:
 436         mutex_unlock(&fsi->state->policy_mutex);
 437
 438         if (plm)
 439                 vfree(plm->data);
 440         kfree(plm);
 441         return rc;
 442 }
 443
 444 static int sel_release_policy(struct inode *inode, struct file *filp)
 445 {
 446         struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
 447         struct policy_load_memory *plm = filp->private_data;
 448
 449         BUG_ON(!plm);
 450
 451         fsi->policy_opened = 0;
 452
 453         vfree(plm->data);
 454         kfree(plm);
 455
 456         return 0;
 457 }
 458
 459 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
 460                                size_t count, loff_t *ppos)
 461 {
 462         struct policy_load_memory *plm = filp->private_data;
 463         int ret;
 464
 465         ret = avc_has_perm(&selinux_state,
 466                            current_sid(), SECINITSID_SECURITY,
 467                           SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
 468         if (ret)
 469                 return ret;
 470
 471         return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
 472 }
 473
 474 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
 475 {
 476         struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
 477         unsigned long offset;
 478         struct page *page;
 479
 480         if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
 481                 return VM_FAULT_SIGBUS;
 482
 483         offset = vmf->pgoff << PAGE_SHIFT;
 484         if (offset >= roundup(plm->len, PAGE_SIZE))
 485                 return VM_FAULT_SIGBUS;
 486
 487         page = vmalloc_to_page(plm->data + offset);
 488         get_page(page);
 489
 490         vmf->page = page;
 491
 492         return 0;
 493 }
 494
 495 static const struct vm_operations_struct sel_mmap_policy_ops = {
 496         .fault = sel_mmap_policy_fault,
 497         .page_mkwrite = sel_mmap_policy_fault,
 498 };
 499
 500 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
 501 {
 502         if (vma->vm_flags & VM_SHARED) {
 503                 /* do not allow mprotect to make mapping writable */
 504                 vma->vm_flags &= ~VM_MAYWRITE;
 505
 506                 if (vma->vm_flags & VM_WRITE)
 507                         return -EACCES;
 508         }
 509
 510         vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 511         vma->vm_ops = &sel_mmap_policy_ops;
 512
 513         return 0;
 514 }
 515
 516 static const struct file_operations sel_policy_ops = {
 517         .open           = sel_open_policy,
 518         .read           = sel_read_policy,
 519         .mmap           = sel_mmap_policy,
 520         .release        = sel_release_policy,
 521         .llseek         = generic_file_llseek,
 522 };
 523
 524 static void sel_remove_old_bool_data(unsigned int bool_num, char **bool_names,
 525                                 unsigned int *bool_values)
 526 {
 527         u32 i;
 528
 529         /* bool_dir cleanup */
 530         for (i = 0; i < bool_num; i++)
 531                 kfree(bool_names[i]);
 532         kfree(bool_names);
 533         kfree(bool_values);
 534 }
 535
 536 static int sel_make_policy_nodes(struct selinux_fs_info *fsi,
 537                                 struct selinux_policy *newpolicy)
 538 {
 539         int ret = 0;
 540         struct dentry *tmp_parent, *tmp_bool_dir, *tmp_class_dir, *old_dentry;
 541         unsigned int tmp_bool_num, old_bool_num;
 542         char **tmp_bool_names, **old_bool_names;
 543         unsigned int *tmp_bool_values, *old_bool_values;
 544         unsigned long tmp_ino = fsi->last_ino; /* Don't increment last_ino in this function */
 545
 546         tmp_parent = sel_make_disconnected_dir(fsi->sb, &tmp_ino);
 547         if (IS_ERR(tmp_parent))
 548                 return PTR_ERR(tmp_parent);
 549
 550         tmp_ino = fsi->bool_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
 551         tmp_bool_dir = sel_make_dir(tmp_parent, BOOL_DIR_NAME, &tmp_ino);
 552         if (IS_ERR(tmp_bool_dir)) {
 553                 ret = PTR_ERR(tmp_bool_dir);
 554                 goto out;
 555         }
 556
 557         tmp_ino = fsi->class_dir->d_inode->i_ino - 1; /* sel_make_dir will increment and set */
 558         tmp_class_dir = sel_make_dir(tmp_parent, CLASS_DIR_NAME, &tmp_ino);
 559         if (IS_ERR(tmp_class_dir)) {
 560                 ret = PTR_ERR(tmp_class_dir);
 561                 goto out;
 562         }
 563
 564         ret = sel_make_bools(newpolicy, tmp_bool_dir, &tmp_bool_num,
 565                              &tmp_bool_names, &tmp_bool_values);
 566         if (ret)
 567                 goto out;
 568
 569         ret = sel_make_classes(newpolicy, tmp_class_dir,
 570                                &fsi->last_class_ino);
 571         if (ret)
 572                 goto out;
 573
 574         /* booleans */
 575         old_dentry = fsi->bool_dir;
 576         lock_rename(tmp_bool_dir, old_dentry);
 577         d_exchange(tmp_bool_dir, fsi->bool_dir);
 578
 579         old_bool_num = fsi->bool_num;
 580         old_bool_names = fsi->bool_pending_names;
 581         old_bool_values = fsi->bool_pending_values;
 582
 583         fsi->bool_num = tmp_bool_num;
 584         fsi->bool_pending_names = tmp_bool_names;
 585         fsi->bool_pending_values = tmp_bool_values;
 586
 587         sel_remove_old_bool_data(old_bool_num, old_bool_names, old_bool_values);
 588
 589         fsi->bool_dir = tmp_bool_dir;
 590         unlock_rename(tmp_bool_dir, old_dentry);
 591
 592         /* classes */
 593         old_dentry = fsi->class_dir;
 594         lock_rename(tmp_class_dir, old_dentry);
 595         d_exchange(tmp_class_dir, fsi->class_dir);
 596         fsi->class_dir = tmp_class_dir;
 597         unlock_rename(tmp_class_dir, old_dentry);
 598
 599 out:
 600         /* Since the other temporary dirs are children of tmp_parent
 601          * this will handle all the cleanup in the case of a failure before
 602          * the swapover
 603          */
 604         sel_remove_entries(tmp_parent);
 605         dput(tmp_parent); /* d_genocide() only handles the children */
 606
 607         return ret;
 608 }
 609
 610 static ssize_t sel_write_load(struct file *file, const char __user *buf,
 611                               size_t count, loff_t *ppos)
 612
 613 {
 614         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 615         struct selinux_load_state load_state;
 616         ssize_t length;
 617         void *data = NULL;
 618
 619         mutex_lock(&fsi->state->policy_mutex);
 620
 621         length = avc_has_perm(&selinux_state,
 622                               current_sid(), SECINITSID_SECURITY,
 623                               SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
 624         if (length)
 625                 goto out;
 626
 627         /* No partial writes. */
 628         length = -EINVAL;
 629         if (*ppos != 0)
 630                 goto out;
 631
 632         length = -ENOMEM;
 633         data = vmalloc(count);
 634         if (!data)
 635                 goto out;
 636
 637         length = -EFAULT;
 638         if (copy_from_user(data, buf, count) != 0)
 639                 goto out;
 640
 641         length = security_load_policy(fsi->state, data, count, &load_state);
 642         if (length) {
 643                 pr_warn_ratelimited("SELinux: failed to load policy\n");
 644                 goto out;
 645         }
 646
 647         length = sel_make_policy_nodes(fsi, load_state.policy);
 648         if (length) {
 649                 pr_warn_ratelimited("SELinux: failed to initialize selinuxfs\n");
 650                 selinux_policy_cancel(fsi->state, &load_state);
 651                 goto out;
 652         }
 653
 654         selinux_policy_commit(fsi->state, &load_state);
 655
 656         length = count;
 657
 658         audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 659                 "auid=%u ses=%u lsm=selinux res=1",
 660                 from_kuid(&init_user_ns, audit_get_loginuid(current)),
 661                 audit_get_sessionid(current));
 662 out:
 663         mutex_unlock(&fsi->state->policy_mutex);
 664         vfree(data);
 665         return length;
 666 }
 667
 668 static const struct file_operations sel_load_ops = {
 669         .write          = sel_write_load,
 670         .llseek         = generic_file_llseek,
 671 };
 672
 673 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 674 {
 675         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 676         struct selinux_state *state = fsi->state;
 677         char *canon = NULL;
 678         u32 sid, len;
 679         ssize_t length;
 680
 681         length = avc_has_perm(&selinux_state,
 682                               current_sid(), SECINITSID_SECURITY,
 683                               SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
 684         if (length)
 685                 goto out;
 686
 687         length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
 688         if (length)
 689                 goto out;
 690
 691         length = security_sid_to_context(state, sid, &canon, &len);
 692         if (length)
 693                 goto out;
 694
 695         length = -ERANGE;
 696         if (len > SIMPLE_TRANSACTION_LIMIT) {
 697                 pr_err("SELinux: %s:  context size (%u) exceeds "
 698                         "payload max\n", __func__, len);
 699                 goto out;
 700         }
 701
 702         memcpy(buf, canon, len);
 703         length = len;
 704 out:
 705         kfree(canon);
 706         return length;
 707 }
 708
 709 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 710                                      size_t count, loff_t *ppos)
 711 {
 712         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
 713         char tmpbuf[TMPBUFLEN];
 714         ssize_t length;
 715
 716         length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
 717                            checkreqprot_get(fsi->state));
 718         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 719 }
 720
 721 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 722                                       size_t count, loff_t *ppos)
 723 {
 724         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 725         char *page;
 726         ssize_t length;
 727         unsigned int new_value;
 728
 729         length = avc_has_perm(&selinux_state,
 730                               current_sid(), SECINITSID_SECURITY,
 731                               SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
 732                               NULL);
 733         if (length)
 734                 return length;
 735
 736         if (count >= PAGE_SIZE)
 737                 return -ENOMEM;
 738
 739         /* No partial writes. */
 740         if (*ppos != 0)
 741                 return -EINVAL;
 742
 743         page = memdup_user_nul(buf, count);
 744         if (IS_ERR(page))
 745                 return PTR_ERR(page);
 746
 747         length = -EINVAL;
 748         if (sscanf(page, "%u", &new_value) != 1)
 749                 goto out;
 750
 751         if (new_value) {
 752                 char comm[sizeof(current->comm)];
 753
 754                 memcpy(comm, current->comm, sizeof(comm));
 755                 pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
 756                              comm, current->pid);
 757         }
 758
 759         checkreqprot_set(fsi->state, (new_value ? 1 : 0));
 760         length = count;
 761 out:
 762         kfree(page);
 763         return length;
 764 }
 765 static const struct file_operations sel_checkreqprot_ops = {
 766         .read           = sel_read_checkreqprot,
 767         .write          = sel_write_checkreqprot,
 768         .llseek         = generic_file_llseek,
 769 };
 770
 771 static ssize_t sel_write_validatetrans(struct file *file,
 772                                         const char __user *buf,
 773                                         size_t count, loff_t *ppos)
 774 {
 775         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 776         struct selinux_state *state = fsi->state;
 777         char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
 778         char *req = NULL;
 779         u32 osid, nsid, tsid;
 780         u16 tclass;
 781         int rc;
 782
 783         rc = avc_has_perm(&selinux_state,
 784                           current_sid(), SECINITSID_SECURITY,
 785                           SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
 786         if (rc)
 787                 goto out;
 788
 789         rc = -ENOMEM;
 790         if (count >= PAGE_SIZE)
 791                 goto out;
 792
 793         /* No partial writes. */
 794         rc = -EINVAL;
 795         if (*ppos != 0)
 796                 goto out;
 797
 798         req = memdup_user_nul(buf, count);
 799         if (IS_ERR(req)) {
 800                 rc = PTR_ERR(req);
 801                 req = NULL;
 802                 goto out;
 803         }
 804
 805         rc = -ENOMEM;
 806         oldcon = kzalloc(count + 1, GFP_KERNEL);
 807         if (!oldcon)
 808                 goto out;
 809
 810         newcon = kzalloc(count + 1, GFP_KERNEL);
 811         if (!newcon)
 812                 goto out;
 813
 814         taskcon = kzalloc(count + 1, GFP_KERNEL);
 815         if (!taskcon)
 816                 goto out;
 817
 818         rc = -EINVAL;
 819         if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
 820                 goto out;
 821
 822         rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
 823         if (rc)
 824                 goto out;
 825
 826         rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
 827         if (rc)
 828                 goto out;
 829
 830         rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
 831         if (rc)
 832                 goto out;
 833
 834         rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
 835         if (!rc)
 836                 rc = count;
 837 out:
 838         kfree(req);
 839         kfree(oldcon);
 840         kfree(newcon);
 841         kfree(taskcon);
 842         return rc;
 843 }
 844
 845 static const struct file_operations sel_transition_ops = {
 846         .write          = sel_write_validatetrans,
 847         .llseek         = generic_file_llseek,
 848 };
 849
 850 /*
 851  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 852  */
 853 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 854 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 855 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 856 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 857 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 858
 859 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
 860         [SEL_ACCESS] = sel_write_access,
 861         [SEL_CREATE] = sel_write_create,
 862         [SEL_RELABEL] = sel_write_relabel,
 863         [SEL_USER] = sel_write_user,
 864         [SEL_MEMBER] = sel_write_member,
 865         [SEL_CONTEXT] = sel_write_context,
 866 };
 867
 868 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 869 {
 870         ino_t ino = file_inode(file)->i_ino;
 871         char *data;
 872         ssize_t rv;
 873
 874         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 875                 return -EINVAL;
 876
 877         data = simple_transaction_get(file, buf, size);
 878         if (IS_ERR(data))
 879                 return PTR_ERR(data);
 880
 881         rv = write_op[ino](file, data, size);
 882         if (rv > 0) {
 883                 simple_transaction_set(file, rv);
 884                 rv = size;
 885         }
 886         return rv;
 887 }
 888
 889 static const struct file_operations transaction_ops = {
 890         .write          = selinux_transaction_write,
 891         .read           = simple_transaction_read,
 892         .release        = simple_transaction_release,
 893         .llseek         = generic_file_llseek,
 894 };
 895
 896 /*
 897  * payload - write methods
 898  * If the method has a response, the response should be put in buf,
 899  * and the length returned.  Otherwise return 0 or and -error.
 900  */
 901
 902 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 903 {
 904         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 905         struct selinux_state *state = fsi->state;
 906         char *scon = NULL, *tcon = NULL;
 907         u32 ssid, tsid;
 908         u16 tclass;
 909         struct av_decision avd;
 910         ssize_t length;
 911
 912         length = avc_has_perm(&selinux_state,
 913                               current_sid(), SECINITSID_SECURITY,
 914                               SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
 915         if (length)
 916                 goto out;
 917
 918         length = -ENOMEM;
 919         scon = kzalloc(size + 1, GFP_KERNEL);
 920         if (!scon)
 921                 goto out;
 922
 923         length = -ENOMEM;
 924         tcon = kzalloc(size + 1, GFP_KERNEL);
 925         if (!tcon)
 926                 goto out;
 927
 928         length = -EINVAL;
 929         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 930                 goto out;
 931
 932         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
 933         if (length)
 934                 goto out;
 935
 936         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
 937         if (length)
 938                 goto out;
 939
 940         security_compute_av_user(state, ssid, tsid, tclass, &avd);
 941
 942         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 943                           "%x %x %x %x %u %x",
 944                           avd.allowed, 0xffffffff,
 945                           avd.auditallow, avd.auditdeny,
 946                           avd.seqno, avd.flags);
 947 out:
 948         kfree(tcon);
 949         kfree(scon);
 950         return length;
 951 }
 952
 953 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 954 {
 955         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
 956         struct selinux_state *state = fsi->state;
 957         char *scon = NULL, *tcon = NULL;
 958         char *namebuf = NULL, *objname = NULL;
 959         u32 ssid, tsid, newsid;
 960         u16 tclass;
 961         ssize_t length;
 962         char *newcon = NULL;
 963         u32 len;
 964         int nargs;
 965
 966         length = avc_has_perm(&selinux_state,
 967                               current_sid(), SECINITSID_SECURITY,
 968                               SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
 969                               NULL);
 970         if (length)
 971                 goto out;
 972
 973         length = -ENOMEM;
 974         scon = kzalloc(size + 1, GFP_KERNEL);
 975         if (!scon)
 976                 goto out;
 977
 978         length = -ENOMEM;
 979         tcon = kzalloc(size + 1, GFP_KERNEL);
 980         if (!tcon)
 981                 goto out;
 982
 983         length = -ENOMEM;
 984         namebuf = kzalloc(size + 1, GFP_KERNEL);
 985         if (!namebuf)
 986                 goto out;
 987
 988         length = -EINVAL;
 989         nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
 990         if (nargs < 3 || nargs > 4)
 991                 goto out;
 992         if (nargs == 4) {
 993                 /*
 994                  * If and when the name of new object to be queried contains
 995                  * either whitespace or multibyte characters, they shall be
 996                  * encoded based on the percentage-encoding rule.
 997                  * If not encoded, the sscanf logic picks up only left-half
 998                  * of the supplied name; splitted by a whitespace unexpectedly.
 999                  */
1000                 char   *r, *w;
1001                 int     c1, c2;
1002
1003                 r = w = namebuf;
1004                 do {
1005                         c1 = *r++;
1006                         if (c1 == '+')
1007                                 c1 = ' ';
1008                         else if (c1 == '%') {
1009                                 c1 = hex_to_bin(*r++);
1010                                 if (c1 < 0)
1011                                         goto out;
1012                                 c2 = hex_to_bin(*r++);
1013                                 if (c2 < 0)
1014                                         goto out;
1015                                 c1 = (c1 << 4) | c2;
1016                         }
1017                         *w++ = c1;
1018                 } while (c1 != '\0');
1019
1020                 objname = namebuf;
1021         }
1022
1023         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1024         if (length)
1025                 goto out;
1026
1027         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1028         if (length)
1029                 goto out;
1030
1031         length = security_transition_sid_user(state, ssid, tsid, tclass,
1032                                               objname, &newsid);
1033         if (length)
1034                 goto out;
1035
1036         length = security_sid_to_context(state, newsid, &newcon, &len);
1037         if (length)
1038                 goto out;
1039
1040         length = -ERANGE;
1041         if (len > SIMPLE_TRANSACTION_LIMIT) {
1042                 pr_err("SELinux: %s:  context size (%u) exceeds "
1043                         "payload max\n", __func__, len);
1044                 goto out;
1045         }
1046
1047         memcpy(buf, newcon, len);
1048         length = len;
1049 out:
1050         kfree(newcon);
1051         kfree(namebuf);
1052         kfree(tcon);
1053         kfree(scon);
1054         return length;
1055 }
1056
1057 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
1058 {
1059         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1060         struct selinux_state *state = fsi->state;
1061         char *scon = NULL, *tcon = NULL;
1062         u32 ssid, tsid, newsid;
1063         u16 tclass;
1064         ssize_t length;
1065         char *newcon = NULL;
1066         u32 len;
1067
1068         length = avc_has_perm(&selinux_state,
1069                               current_sid(), SECINITSID_SECURITY,
1070                               SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
1071                               NULL);
1072         if (length)
1073                 goto out;
1074
1075         length = -ENOMEM;
1076         scon = kzalloc(size + 1, GFP_KERNEL);
1077         if (!scon)
1078                 goto out;
1079
1080         length = -ENOMEM;
1081         tcon = kzalloc(size + 1, GFP_KERNEL);
1082         if (!tcon)
1083                 goto out;
1084
1085         length = -EINVAL;
1086         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1087                 goto out;
1088
1089         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1090         if (length)
1091                 goto out;
1092
1093         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1094         if (length)
1095                 goto out;
1096
1097         length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1098         if (length)
1099                 goto out;
1100
1101         length = security_sid_to_context(state, newsid, &newcon, &len);
1102         if (length)
1103                 goto out;
1104
1105         length = -ERANGE;
1106         if (len > SIMPLE_TRANSACTION_LIMIT)
1107                 goto out;
1108
1109         memcpy(buf, newcon, len);
1110         length = len;
1111 out:
1112         kfree(newcon);
1113         kfree(tcon);
1114         kfree(scon);
1115         return length;
1116 }
1117
1118 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1119 {
1120         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1121         struct selinux_state *state = fsi->state;
1122         char *con = NULL, *user = NULL, *ptr;
1123         u32 sid, *sids = NULL;
1124         ssize_t length;
1125         char *newcon;
1126         int i, rc;
1127         u32 len, nsids;
1128
1129         length = avc_has_perm(&selinux_state,
1130                               current_sid(), SECINITSID_SECURITY,
1131                               SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1132                               NULL);
1133         if (length)
1134                 goto out;
1135
1136         length = -ENOMEM;
1137         con = kzalloc(size + 1, GFP_KERNEL);
1138         if (!con)
1139                 goto out;
1140
1141         length = -ENOMEM;
1142         user = kzalloc(size + 1, GFP_KERNEL);
1143         if (!user)
1144                 goto out;
1145
1146         length = -EINVAL;
1147         if (sscanf(buf, "%s %s", con, user) != 2)
1148                 goto out;
1149
1150         length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1151         if (length)
1152                 goto out;
1153
1154         length = security_get_user_sids(state, sid, user, &sids, &nsids);
1155         if (length)
1156                 goto out;
1157
1158         length = sprintf(buf, "%u", nsids) + 1;
1159         ptr = buf + length;
1160         for (i = 0; i < nsids; i++) {
1161                 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1162                 if (rc) {
1163                         length = rc;
1164                         goto out;
1165                 }
1166                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1167                         kfree(newcon);
1168                         length = -ERANGE;
1169                         goto out;
1170                 }
1171                 memcpy(ptr, newcon, len);
1172                 kfree(newcon);
1173                 ptr += len;
1174                 length += len;
1175         }
1176 out:
1177         kfree(sids);
1178         kfree(user);
1179         kfree(con);
1180         return length;
1181 }
1182
1183 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1184 {
1185         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1186         struct selinux_state *state = fsi->state;
1187         char *scon = NULL, *tcon = NULL;
1188         u32 ssid, tsid, newsid;
1189         u16 tclass;
1190         ssize_t length;
1191         char *newcon = NULL;
1192         u32 len;
1193
1194         length = avc_has_perm(&selinux_state,
1195                               current_sid(), SECINITSID_SECURITY,
1196                               SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1197                               NULL);
1198         if (length)
1199                 goto out;
1200
1201         length = -ENOMEM;
1202         scon = kzalloc(size + 1, GFP_KERNEL);
1203         if (!scon)
1204                 goto out;
1205
1206         length = -ENOMEM;
1207         tcon = kzalloc(size + 1, GFP_KERNEL);
1208         if (!tcon)
1209                 goto out;
1210
1211         length = -EINVAL;
1212         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1213                 goto out;
1214
1215         length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1216         if (length)
1217                 goto out;
1218
1219         length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1220         if (length)
1221                 goto out;
1222
1223         length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1224         if (length)
1225                 goto out;
1226
1227         length = security_sid_to_context(state, newsid, &newcon, &len);
1228         if (length)
1229                 goto out;
1230
1231         length = -ERANGE;
1232         if (len > SIMPLE_TRANSACTION_LIMIT) {
1233                 pr_err("SELinux: %s:  context size (%u) exceeds "
1234                         "payload max\n", __func__, len);
1235                 goto out;
1236         }
1237
1238         memcpy(buf, newcon, len);
1239         length = len;
1240 out:
1241         kfree(newcon);
1242         kfree(tcon);
1243         kfree(scon);
1244         return length;
1245 }
1246
1247 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1248 {
1249         struct inode *ret = new_inode(sb);
1250
1251         if (ret) {
1252                 ret->i_mode = mode;
1253                 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1254         }
1255         return ret;
1256 }
1257
1258 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1259                              size_t count, loff_t *ppos)
1260 {
1261         struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1262         char *page = NULL;
1263         ssize_t length;
1264         ssize_t ret;
1265         int cur_enforcing;
1266         unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1267         const char *name = filep->f_path.dentry->d_name.name;
1268
1269         mutex_lock(&fsi->state->policy_mutex);
1270
1271         ret = -EINVAL;
1272         if (index >= fsi->bool_num || strcmp(name,
1273                                              fsi->bool_pending_names[index]))
1274                 goto out_unlock;
1275
1276         ret = -ENOMEM;
1277         page = (char *)get_zeroed_page(GFP_KERNEL);
1278         if (!page)
1279                 goto out_unlock;
1280
1281         cur_enforcing = security_get_bool_value(fsi->state, index);
1282         if (cur_enforcing < 0) {
1283                 ret = cur_enforcing;
1284                 goto out_unlock;
1285         }
1286         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1287                           fsi->bool_pending_values[index]);
1288         mutex_unlock(&fsi->state->policy_mutex);
1289         ret = simple_read_from_buffer(buf, count, ppos, page, length);
1290 out_free:
1291         free_page((unsigned long)page);
1292         return ret;
1293
1294 out_unlock:
1295         mutex_unlock(&fsi->state->policy_mutex);
1296         goto out_free;
1297 }
1298
1299 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1300                               size_t count, loff_t *ppos)
1301 {
1302         struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1303         char *page = NULL;
1304         ssize_t length;
1305         int new_value;
1306         unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1307         const char *name = filep->f_path.dentry->d_name.name;
1308
1309         if (count >= PAGE_SIZE)
1310                 return -ENOMEM;
1311
1312         /* No partial writes. */
1313         if (*ppos != 0)
1314                 return -EINVAL;
1315
1316         page = memdup_user_nul(buf, count);
1317         if (IS_ERR(page))
1318                 return PTR_ERR(page);
1319
1320         mutex_lock(&fsi->state->policy_mutex);
1321
1322         length = avc_has_perm(&selinux_state,
1323                               current_sid(), SECINITSID_SECURITY,
1324                               SECCLASS_SECURITY, SECURITY__SETBOOL,
1325                               NULL);
1326         if (length)
1327                 goto out;
1328
1329         length = -EINVAL;
1330         if (index >= fsi->bool_num || strcmp(name,
1331                                              fsi->bool_pending_names[index]))
1332                 goto out;
1333
1334         length = -EINVAL;
1335         if (sscanf(page, "%d", &new_value) != 1)
1336                 goto out;
1337
1338         if (new_value)
1339                 new_value = 1;
1340
1341         fsi->bool_pending_values[index] = new_value;
1342         length = count;
1343
1344 out:
1345         mutex_unlock(&fsi->state->policy_mutex);
1346         kfree(page);
1347         return length;
1348 }
1349
1350 static const struct file_operations sel_bool_ops = {
1351         .read           = sel_read_bool,
1352         .write          = sel_write_bool,
1353         .llseek         = generic_file_llseek,
1354 };
1355
1356 static ssize_t sel_commit_bools_write(struct file *filep,
1357                                       const char __user *buf,
1358                                       size_t count, loff_t *ppos)
1359 {
1360         struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1361         char *page = NULL;
1362         ssize_t length;
1363         int new_value;
1364
1365         if (count >= PAGE_SIZE)
1366                 return -ENOMEM;
1367
1368         /* No partial writes. */
1369         if (*ppos != 0)
1370                 return -EINVAL;
1371
1372         page = memdup_user_nul(buf, count);
1373         if (IS_ERR(page))
1374                 return PTR_ERR(page);
1375
1376         mutex_lock(&fsi->state->policy_mutex);
1377
1378         length = avc_has_perm(&selinux_state,
1379                               current_sid(), SECINITSID_SECURITY,
1380                               SECCLASS_SECURITY, SECURITY__SETBOOL,
1381                               NULL);
1382         if (length)
1383                 goto out;
1384
1385         length = -EINVAL;
1386         if (sscanf(page, "%d", &new_value) != 1)
1387                 goto out;
1388
1389         length = 0;
1390         if (new_value && fsi->bool_pending_values)
1391                 length = security_set_bools(fsi->state, fsi->bool_num,
1392                                             fsi->bool_pending_values);
1393
1394         if (!length)
1395                 length = count;
1396
1397 out:
1398         mutex_unlock(&fsi->state->policy_mutex);
1399         kfree(page);
1400         return length;
1401 }
1402
1403 static const struct file_operations sel_commit_bools_ops = {
1404         .write          = sel_commit_bools_write,
1405         .llseek         = generic_file_llseek,
1406 };
1407
1408 static void sel_remove_entries(struct dentry *de)
1409 {
1410         d_genocide(de);
1411         shrink_dcache_parent(de);
1412 }
1413
1414 static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
1415                           unsigned int *bool_num, char ***bool_pending_names,
1416                           unsigned int **bool_pending_values)
1417 {
1418         int ret;
1419         ssize_t len;
1420         struct dentry *dentry = NULL;
1421         struct inode *inode = NULL;
1422         struct inode_security_struct *isec;
1423         char **names = NULL, *page;
1424         u32 i, num;
1425         int *values = NULL;
1426         u32 sid;
1427
1428         ret = -ENOMEM;
1429         page = (char *)get_zeroed_page(GFP_KERNEL);
1430         if (!page)
1431                 goto out;
1432
1433         ret = security_get_bools(newpolicy, &num, &names, &values);
1434         if (ret)
1435                 goto out;
1436
1437         for (i = 0; i < num; i++) {
1438                 ret = -ENOMEM;
1439                 dentry = d_alloc_name(bool_dir, names[i]);
1440                 if (!dentry)
1441                         goto out;
1442
1443                 ret = -ENOMEM;
1444                 inode = sel_make_inode(bool_dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1445                 if (!inode) {
1446                         dput(dentry);
1447                         goto out;
1448                 }
1449
1450                 ret = -ENAMETOOLONG;
1451                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1452                 if (len >= PAGE_SIZE) {
1453                         dput(dentry);
1454                         iput(inode);
1455                         goto out;
1456                 }
1457
1458                 isec = selinux_inode(inode);
1459                 ret = selinux_policy_genfs_sid(newpolicy, "selinuxfs", page,
1460                                          SECCLASS_FILE, &sid);
1461                 if (ret) {
1462                         pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1463                                            page);
1464                         sid = SECINITSID_SECURITY;
1465                 }
1466
1467                 isec->sid = sid;
1468                 isec->initialized = LABEL_INITIALIZED;
1469                 inode->i_fop = &sel_bool_ops;
1470                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1471                 d_add(dentry, inode);
1472         }
1473         *bool_num = num;
1474         *bool_pending_names = names;
1475         *bool_pending_values = values;
1476
1477         free_page((unsigned long)page);
1478         return 0;
1479 out:
1480         free_page((unsigned long)page);
1481
1482         if (names) {
1483                 for (i = 0; i < num; i++)
1484                         kfree(names[i]);
1485                 kfree(names);
1486         }
1487         kfree(values);
1488         sel_remove_entries(bool_dir);
1489
1490         return ret;
1491 }
1492
1493 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1494                                             size_t count, loff_t *ppos)
1495 {
1496         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1497         struct selinux_state *state = fsi->state;
1498         char tmpbuf[TMPBUFLEN];
1499         ssize_t length;
1500
1501         length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1502                            avc_get_cache_threshold(state->avc));
1503         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1504 }
1505
1506 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1507                                              const char __user *buf,
1508                                              size_t count, loff_t *ppos)
1509
1510 {
1511         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1512         struct selinux_state *state = fsi->state;
1513         char *page;
1514         ssize_t ret;
1515         unsigned int new_value;
1516
1517         ret = avc_has_perm(&selinux_state,
1518                            current_sid(), SECINITSID_SECURITY,
1519                            SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1520                            NULL);
1521         if (ret)
1522                 return ret;
1523
1524         if (count >= PAGE_SIZE)
1525                 return -ENOMEM;
1526
1527         /* No partial writes. */
1528         if (*ppos != 0)
1529                 return -EINVAL;
1530
1531         page = memdup_user_nul(buf, count);
1532         if (IS_ERR(page))
1533                 return PTR_ERR(page);
1534
1535         ret = -EINVAL;
1536         if (sscanf(page, "%u", &new_value) != 1)
1537                 goto out;
1538
1539         avc_set_cache_threshold(state->avc, new_value);
1540
1541         ret = count;
1542 out:
1543         kfree(page);
1544         return ret;
1545 }
1546
1547 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1548                                        size_t count, loff_t *ppos)
1549 {
1550         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1551         struct selinux_state *state = fsi->state;
1552         char *page;
1553         ssize_t length;
1554
1555         page = (char *)__get_free_page(GFP_KERNEL);
1556         if (!page)
1557                 return -ENOMEM;
1558
1559         length = avc_get_hash_stats(state->avc, page);
1560         if (length >= 0)
1561                 length = simple_read_from_buffer(buf, count, ppos, page, length);
1562         free_page((unsigned long)page);
1563
1564         return length;
1565 }
1566
1567 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1568                                         size_t count, loff_t *ppos)
1569 {
1570         struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1571         struct selinux_state *state = fsi->state;
1572         char *page;
1573         ssize_t length;
1574
1575         page = (char *)__get_free_page(GFP_KERNEL);
1576         if (!page)
1577                 return -ENOMEM;
1578
1579         length = security_sidtab_hash_stats(state, page);
1580         if (length >= 0)
1581                 length = simple_read_from_buffer(buf, count, ppos, page,
1582                                                 length);
1583         free_page((unsigned long)page);
1584
1585         return length;
1586 }
1587
1588 static const struct file_operations sel_sidtab_hash_stats_ops = {
1589         .read           = sel_read_sidtab_hash_stats,
1590         .llseek         = generic_file_llseek,
1591 };
1592
1593 static const struct file_operations sel_avc_cache_threshold_ops = {
1594         .read           = sel_read_avc_cache_threshold,
1595         .write          = sel_write_avc_cache_threshold,
1596         .llseek         = generic_file_llseek,
1597 };
1598
1599 static const struct file_operations sel_avc_hash_stats_ops = {
1600         .read           = sel_read_avc_hash_stats,
1601         .llseek         = generic_file_llseek,
1602 };
1603
1604 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1605 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1606 {
1607         int cpu;
1608
1609         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1610                 if (!cpu_possible(cpu))
1611                         continue;
1612                 *idx = cpu + 1;
1613                 return &per_cpu(avc_cache_stats, cpu);
1614         }
1615         (*idx)++;
1616         return NULL;
1617 }
1618
1619 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1620 {
1621         loff_t n = *pos - 1;
1622
1623         if (*pos == 0)
1624                 return SEQ_START_TOKEN;
1625
1626         return sel_avc_get_stat_idx(&n);
1627 }
1628
1629 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1630 {
1631         return sel_avc_get_stat_idx(pos);
1632 }
1633
1634 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1635 {
1636         struct avc_cache_stats *st = v;
1637
1638         if (v == SEQ_START_TOKEN) {
1639                 seq_puts(seq,
1640                          "lookups hits misses allocations reclaims frees\n");
1641         } else {
1642                 unsigned int lookups = st->lookups;
1643                 unsigned int misses = st->misses;
1644                 unsigned int hits = lookups - misses;
1645                 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1646                            hits, misses, st->allocations,
1647                            st->reclaims, st->frees);
1648         }
1649         return 0;
1650 }
1651
1652 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1653 { }
1654
1655 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1656         .start          = sel_avc_stats_seq_start,
1657         .next           = sel_avc_stats_seq_next,
1658         .show           = sel_avc_stats_seq_show,
1659         .stop           = sel_avc_stats_seq_stop,
1660 };
1661
1662 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1663 {
1664         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1665 }
1666
1667 static const struct file_operations sel_avc_cache_stats_ops = {
1668         .open           = sel_open_avc_cache_stats,
1669         .read           = seq_read,
1670         .llseek         = seq_lseek,
1671         .release        = seq_release,
1672 };
1673 #endif
1674
1675 static int sel_make_avc_files(struct dentry *dir)
1676 {
1677         struct super_block *sb = dir->d_sb;
1678         struct selinux_fs_info *fsi = sb->s_fs_info;
1679         int i;
1680         static const struct tree_descr files[] = {
1681                 { "cache_threshold",
1682                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1683                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1684 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1685                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1686 #endif
1687         };
1688
1689         for (i = 0; i < ARRAY_SIZE(files); i++) {
1690                 struct inode *inode;
1691                 struct dentry *dentry;
1692
1693                 dentry = d_alloc_name(dir, files[i].name);
1694                 if (!dentry)
1695                         return -ENOMEM;
1696
1697                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1698                 if (!inode) {
1699                         dput(dentry);
1700                         return -ENOMEM;
1701                 }
1702
1703                 inode->i_fop = files[i].ops;
1704                 inode->i_ino = ++fsi->last_ino;
1705                 d_add(dentry, inode);
1706         }
1707
1708         return 0;
1709 }
1710
1711 static int sel_make_ss_files(struct dentry *dir)
1712 {
1713         struct super_block *sb = dir->d_sb;
1714         struct selinux_fs_info *fsi = sb->s_fs_info;
1715         int i;
1716         static struct tree_descr files[] = {
1717                 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1718         };
1719
1720         for (i = 0; i < ARRAY_SIZE(files); i++) {
1721                 struct inode *inode;
1722                 struct dentry *dentry;
1723
1724                 dentry = d_alloc_name(dir, files[i].name);
1725                 if (!dentry)
1726                         return -ENOMEM;
1727
1728                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1729                 if (!inode) {
1730                         dput(dentry);
1731                         return -ENOMEM;
1732                 }
1733
1734                 inode->i_fop = files[i].ops;
1735                 inode->i_ino = ++fsi->last_ino;
1736                 d_add(dentry, inode);
1737         }
1738
1739         return 0;
1740 }
1741
1742 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1743                                 size_t count, loff_t *ppos)
1744 {
1745         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1746         char *con;
1747         u32 sid, len;
1748         ssize_t ret;
1749
1750         sid = file_inode(file)->i_ino&SEL_INO_MASK;
1751         ret = security_sid_to_context(fsi->state, sid, &con, &len);
1752         if (ret)
1753                 return ret;
1754
1755         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1756         kfree(con);
1757         return ret;
1758 }
1759
1760 static const struct file_operations sel_initcon_ops = {
1761         .read           = sel_read_initcon,
1762         .llseek         = generic_file_llseek,
1763 };
1764
1765 static int sel_make_initcon_files(struct dentry *dir)
1766 {
1767         int i;
1768
1769         for (i = 1; i <= SECINITSID_NUM; i++) {
1770                 struct inode *inode;
1771                 struct dentry *dentry;
1772                 const char *s = security_get_initial_sid_context(i);
1773
1774                 if (!s)
1775                         continue;
1776                 dentry = d_alloc_name(dir, s);
1777                 if (!dentry)
1778                         return -ENOMEM;
1779
1780                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1781                 if (!inode) {
1782                         dput(dentry);
1783                         return -ENOMEM;
1784                 }
1785
1786                 inode->i_fop = &sel_initcon_ops;
1787                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1788                 d_add(dentry, inode);
1789         }
1790
1791         return 0;
1792 }
1793
1794 static inline unsigned long sel_class_to_ino(u16 class)
1795 {
1796         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1797 }
1798
1799 static inline u16 sel_ino_to_class(unsigned long ino)
1800 {
1801         return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1802 }
1803
1804 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1805 {
1806         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1807 }
1808
1809 static inline u32 sel_ino_to_perm(unsigned long ino)
1810 {
1811         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1812 }
1813
1814 static ssize_t sel_read_class(struct file *file, char __user *buf,
1815                                 size_t count, loff_t *ppos)
1816 {
1817         unsigned long ino = file_inode(file)->i_ino;
1818         char res[TMPBUFLEN];
1819         ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1820         return simple_read_from_buffer(buf, count, ppos, res, len);
1821 }
1822
1823 static const struct file_operations sel_class_ops = {
1824         .read           = sel_read_class,
1825         .llseek         = generic_file_llseek,
1826 };
1827
1828 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1829                                 size_t count, loff_t *ppos)
1830 {
1831         unsigned long ino = file_inode(file)->i_ino;
1832         char res[TMPBUFLEN];
1833         ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1834         return simple_read_from_buffer(buf, count, ppos, res, len);
1835 }
1836
1837 static const struct file_operations sel_perm_ops = {
1838         .read           = sel_read_perm,
1839         .llseek         = generic_file_llseek,
1840 };
1841
1842 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1843                                   size_t count, loff_t *ppos)
1844 {
1845         struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1846         int value;
1847         char tmpbuf[TMPBUFLEN];
1848         ssize_t length;
1849         unsigned long i_ino = file_inode(file)->i_ino;
1850
1851         value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1852         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1853
1854         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1855 }
1856
1857 static const struct file_operations sel_policycap_ops = {
1858         .read           = sel_read_policycap,
1859         .llseek         = generic_file_llseek,
1860 };
1861
1862 static int sel_make_perm_files(struct selinux_policy *newpolicy,
1863                         char *objclass, int classvalue,
1864                         struct dentry *dir)
1865 {
1866         int i, rc, nperms;
1867         char **perms;
1868
1869         rc = security_get_permissions(newpolicy, objclass, &perms, &nperms);
1870         if (rc)
1871                 return rc;
1872
1873         for (i = 0; i < nperms; i++) {
1874                 struct inode *inode;
1875                 struct dentry *dentry;
1876
1877                 rc = -ENOMEM;
1878                 dentry = d_alloc_name(dir, perms[i]);
1879                 if (!dentry)
1880                         goto out;
1881
1882                 rc = -ENOMEM;
1883                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1884                 if (!inode) {
1885                         dput(dentry);
1886                         goto out;
1887                 }
1888
1889                 inode->i_fop = &sel_perm_ops;
1890                 /* i+1 since perm values are 1-indexed */
1891                 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1892                 d_add(dentry, inode);
1893         }
1894         rc = 0;
1895 out:
1896         for (i = 0; i < nperms; i++)
1897                 kfree(perms[i]);
1898         kfree(perms);
1899         return rc;
1900 }
1901
1902 static int sel_make_class_dir_entries(struct selinux_policy *newpolicy,
1903                                 char *classname, int index,
1904                                 struct dentry *dir)
1905 {
1906         struct super_block *sb = dir->d_sb;
1907         struct selinux_fs_info *fsi = sb->s_fs_info;
1908         struct dentry *dentry = NULL;
1909         struct inode *inode = NULL;
1910         int rc;
1911
1912         dentry = d_alloc_name(dir, "index");
1913         if (!dentry)
1914                 return -ENOMEM;
1915
1916         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1917         if (!inode) {
1918                 dput(dentry);
1919                 return -ENOMEM;
1920         }
1921
1922         inode->i_fop = &sel_class_ops;
1923         inode->i_ino = sel_class_to_ino(index);
1924         d_add(dentry, inode);
1925
1926         dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1927         if (IS_ERR(dentry))
1928                 return PTR_ERR(dentry);
1929
1930         rc = sel_make_perm_files(newpolicy, classname, index, dentry);
1931
1932         return rc;
1933 }
1934
1935 static int sel_make_classes(struct selinux_policy *newpolicy,
1936                             struct dentry *class_dir,
1937                             unsigned long *last_class_ino)
1938 {
1939
1940         int rc, nclasses, i;
1941         char **classes;
1942
1943         rc = security_get_classes(newpolicy, &classes, &nclasses);
1944         if (rc)
1945                 return rc;
1946
1947         /* +2 since classes are 1-indexed */
1948         *last_class_ino = sel_class_to_ino(nclasses + 2);
1949
1950         for (i = 0; i < nclasses; i++) {
1951                 struct dentry *class_name_dir;
1952
1953                 class_name_dir = sel_make_dir(class_dir, classes[i],
1954                                               last_class_ino);
1955                 if (IS_ERR(class_name_dir)) {
1956                         rc = PTR_ERR(class_name_dir);
1957                         goto out;
1958                 }
1959
1960                 /* i+1 since class values are 1-indexed */
1961                 rc = sel_make_class_dir_entries(newpolicy, classes[i], i + 1,
1962                                 class_name_dir);
1963                 if (rc)
1964                         goto out;
1965         }
1966         rc = 0;
1967 out:
1968         for (i = 0; i < nclasses; i++)
1969                 kfree(classes[i]);
1970         kfree(classes);
1971         return rc;
1972 }
1973
1974 static int sel_make_policycap(struct selinux_fs_info *fsi)
1975 {
1976         unsigned int iter;
1977         struct dentry *dentry = NULL;
1978         struct inode *inode = NULL;
1979
1980         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1981                 if (iter < ARRAY_SIZE(selinux_policycap_names))
1982                         dentry = d_alloc_name(fsi->policycap_dir,
1983                                               selinux_policycap_names[iter]);
1984                 else
1985                         dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1986
1987                 if (dentry == NULL)
1988                         return -ENOMEM;
1989
1990                 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1991                 if (inode == NULL) {
1992                         dput(dentry);
1993                         return -ENOMEM;
1994                 }
1995
1996                 inode->i_fop = &sel_policycap_ops;
1997                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1998                 d_add(dentry, inode);
1999         }
2000
2001         return 0;
2002 }
2003
2004 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
2005                         unsigned long *ino)
2006 {
2007         struct dentry *dentry = d_alloc_name(dir, name);
2008         struct inode *inode;
2009
2010         if (!dentry)
2011                 return ERR_PTR(-ENOMEM);
2012
2013         inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
2014         if (!inode) {
2015                 dput(dentry);
2016                 return ERR_PTR(-ENOMEM);
2017         }
2018
2019         inode->i_op = &simple_dir_inode_operations;
2020         inode->i_fop = &simple_dir_operations;
2021         inode->i_ino = ++(*ino);
2022         /* directory inodes start off with i_nlink == 2 (for "." entry) */
2023         inc_nlink(inode);
2024         d_add(dentry, inode);
2025         /* bump link count on parent directory, too */
2026         inc_nlink(d_inode(dir));
2027
2028         return dentry;
2029 }
2030
2031 static struct dentry *sel_make_disconnected_dir(struct super_block *sb,
2032                                                 unsigned long *ino)
2033 {
2034         struct inode *inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
2035
2036         if (!inode)
2037                 return ERR_PTR(-ENOMEM);
2038
2039         inode->i_op = &simple_dir_inode_operations;
2040         inode->i_fop = &simple_dir_operations;
2041         inode->i_ino = ++(*ino);
2042         /* directory inodes start off with i_nlink == 2 (for "." entry) */
2043         inc_nlink(inode);
2044         return d_obtain_alias(inode);
2045 }
2046
2047 #define NULL_FILE_NAME "null"
2048
2049 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
2050 {
2051         struct selinux_fs_info *fsi;
2052         int ret;
2053         struct dentry *dentry;
2054         struct inode *inode;
2055         struct inode_security_struct *isec;
2056
2057         static const struct tree_descr selinux_files[] = {
2058                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
2059                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
2060                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
2061                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
2062                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
2063                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
2064                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
2065                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
2066                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
2067                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
2068                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
2069                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
2070                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
2071                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
2072                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
2073                 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
2074                 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
2075                 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
2076                                         S_IWUGO},
2077                 /* last one */ {""}
2078         };
2079
2080         ret = selinux_fs_info_create(sb);
2081         if (ret)
2082                 goto err;
2083
2084         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2085         if (ret)
2086                 goto err;
2087
2088         fsi = sb->s_fs_info;
2089         fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2090         if (IS_ERR(fsi->bool_dir)) {
2091                 ret = PTR_ERR(fsi->bool_dir);
2092                 fsi->bool_dir = NULL;
2093                 goto err;
2094         }
2095
2096         ret = -ENOMEM;
2097         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2098         if (!dentry)
2099                 goto err;
2100
2101         ret = -ENOMEM;
2102         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2103         if (!inode) {
2104                 dput(dentry);
2105                 goto err;
2106         }
2107
2108         inode->i_ino = ++fsi->last_ino;
2109         isec = selinux_inode(inode);
2110         isec->sid = SECINITSID_DEVNULL;
2111         isec->sclass = SECCLASS_CHR_FILE;
2112         isec->initialized = LABEL_INITIALIZED;
2113
2114         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2115         d_add(dentry, inode);
2116
2117         dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2118         if (IS_ERR(dentry)) {
2119                 ret = PTR_ERR(dentry);
2120                 goto err;
2121         }
2122
2123         ret = sel_make_avc_files(dentry);
2124
2125         dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2126         if (IS_ERR(dentry)) {
2127                 ret = PTR_ERR(dentry);
2128                 goto err;
2129         }
2130
2131         ret = sel_make_ss_files(dentry);
2132         if (ret)
2133                 goto err;
2134
2135         dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2136         if (IS_ERR(dentry)) {
2137                 ret = PTR_ERR(dentry);
2138                 goto err;
2139         }
2140
2141         ret = sel_make_initcon_files(dentry);
2142         if (ret)
2143                 goto err;
2144
2145         fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
2146         if (IS_ERR(fsi->class_dir)) {
2147                 ret = PTR_ERR(fsi->class_dir);
2148                 fsi->class_dir = NULL;
2149                 goto err;
2150         }
2151
2152         fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
2153                                           &fsi->last_ino);
2154         if (IS_ERR(fsi->policycap_dir)) {
2155                 ret = PTR_ERR(fsi->policycap_dir);
2156                 fsi->policycap_dir = NULL;
2157                 goto err;
2158         }
2159
2160         ret = sel_make_policycap(fsi);
2161         if (ret) {
2162                 pr_err("SELinux: failed to load policy capabilities\n");
2163                 goto err;
2164         }
2165
2166         return 0;
2167 err:
2168         pr_err("SELinux: %s:  failed while creating inodes\n",
2169                 __func__);
2170
2171         selinux_fs_info_free(sb);
2172
2173         return ret;
2174 }
2175
2176 static int sel_get_tree(struct fs_context *fc)
2177 {
2178         return get_tree_single(fc, sel_fill_super);
2179 }
2180
2181 static const struct fs_context_operations sel_context_ops = {
2182         .get_tree       = sel_get_tree,
2183 };
2184
2185 static int sel_init_fs_context(struct fs_context *fc)
2186 {
2187         fc->ops = &sel_context_ops;
2188         return 0;
2189 }
2190
2191 static void sel_kill_sb(struct super_block *sb)
2192 {
2193         selinux_fs_info_free(sb);
2194         kill_litter_super(sb);
2195 }
2196
2197 static struct file_system_type sel_fs_type = {
2198         .name           = "selinuxfs",
2199         .init_fs_context = sel_init_fs_context,
2200         .kill_sb        = sel_kill_sb,
2201 };
2202
2203 static struct vfsmount *selinuxfs_mount __ro_after_init;
2204 struct path selinux_null __ro_after_init;
2205
2206 static int __init init_sel_fs(void)
2207 {
2208         struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2209                                           sizeof(NULL_FILE_NAME)-1);
2210         int err;
2211
2212         if (!selinux_enabled_boot)
2213                 return 0;
2214
2215         err = sysfs_create_mount_point(fs_kobj, "selinux");
2216         if (err)
2217                 return err;
2218
2219         err = register_filesystem(&sel_fs_type);
2220         if (err) {
2221                 sysfs_remove_mount_point(fs_kobj, "selinux");
2222                 return err;
2223         }
2224
2225         selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2226         if (IS_ERR(selinuxfs_mount)) {
2227                 pr_err("selinuxfs:  could not mount!\n");
2228                 err = PTR_ERR(selinuxfs_mount);
2229                 selinuxfs_mount = NULL;
2230         }
2231         selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2232                                                 &null_name);
2233         if (IS_ERR(selinux_null.dentry)) {
2234                 pr_err("selinuxfs:  could not lookup null!\n");
2235                 err = PTR_ERR(selinux_null.dentry);
2236                 selinux_null.dentry = NULL;
2237         }
2238
2239         return err;
2240 }
2241
2242 __initcall(init_sel_fs);
2243
2244 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2245 void exit_sel_fs(void)
2246 {
2247         sysfs_remove_mount_point(fs_kobj, "selinux");
2248         dput(selinux_null.dentry);
2249         kern_unmount(selinuxfs_mount);
2250         unregister_filesystem(&sel_fs_type);
2251 }
2252 #endif