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