security/selinux/selinuxfs.c

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