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