security/selinux/selinuxfs.c

   1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
   2  *
   3  *      Added conditional policy language extensions
   4  *
   5  *  Updated: Hewlett-Packard <paul.moore@hp.com>
   6  *
   7  *      Added support for the policy capability bitmap
   8  *
   9  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  10  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  11  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
  12  *      This program is free software; you can redistribute it and/or modify
  13  *      it under the terms of the GNU General Public License as published by
  14  *      the Free Software Foundation, version 2.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/pagemap.h>
  19 #include <linux/slab.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/fs.h>
  22 #include <linux/mutex.h>
  23 #include <linux/init.h>
  24 #include <linux/string.h>
  25 #include <linux/security.h>
  26 #include <linux/major.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/percpu.h>
  29 #include <linux/audit.h>
  30 #include <asm/uaccess.h>
  31
  32 /* selinuxfs pseudo filesystem for exporting the security policy API.
  33    Based on the proc code and the fs/nfsd/nfsctl.c code. */
  34
  35 #include "flask.h"
  36 #include "avc.h"
  37 #include "avc_ss.h"
  38 #include "security.h"
  39 #include "objsec.h"
  40 #include "conditional.h"
  41
  42 /* Policy capability filenames */
  43 static char *policycap_names[] = {
  44         "network_peer_controls",
  45         "open_perms"
  46 };
  47
  48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
  49
  50 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
  51 #define SELINUX_COMPAT_NET_VALUE 0
  52 #else
  53 #define SELINUX_COMPAT_NET_VALUE 1
  54 #endif
  55
  56 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
  57
  58 static int __init checkreqprot_setup(char *str)
  59 {
  60         selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
  61         return 1;
  62 }
  63 __setup("checkreqprot=", checkreqprot_setup);
  64
  65 static int __init selinux_compat_net_setup(char *str)
  66 {
  67         selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
  68         return 1;
  69 }
  70 __setup("selinux_compat_net=", selinux_compat_net_setup);
  71
  72
  73 static DEFINE_MUTEX(sel_mutex);
  74
  75 /* global data for booleans */
  76 static struct dentry *bool_dir = NULL;
  77 static int bool_num = 0;
  78 static char **bool_pending_names;
  79 static int *bool_pending_values = NULL;
  80
  81 /* global data for classes */
  82 static struct dentry *class_dir = NULL;
  83 static unsigned long last_class_ino;
  84
  85 /* global data for policy capabilities */
  86 static struct dentry *policycap_dir = NULL;
  87
  88 extern void selnl_notify_setenforce(int val);
  89
  90 /* Check whether a task is allowed to use a security operation. */
  91 static int task_has_security(struct task_struct *tsk,
  92                              u32 perms)
  93 {
  94         struct task_security_struct *tsec;
  95
  96         tsec = tsk->security;
  97         if (!tsec)
  98                 return -EACCES;
  99
 100         return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
 101                             SECCLASS_SECURITY, perms, NULL);
 102 }
 103
 104 enum sel_inos {
 105         SEL_ROOT_INO = 2,
 106         SEL_LOAD,       /* load policy */
 107         SEL_ENFORCE,    /* get or set enforcing status */
 108         SEL_CONTEXT,    /* validate context */
 109         SEL_ACCESS,     /* compute access decision */
 110         SEL_CREATE,     /* compute create labeling decision */
 111         SEL_RELABEL,    /* compute relabeling decision */
 112         SEL_USER,       /* compute reachable user contexts */
 113         SEL_POLICYVERS, /* return policy version for this kernel */
 114         SEL_COMMIT_BOOLS, /* commit new boolean values */
 115         SEL_MLS,        /* return if MLS policy is enabled */
 116         SEL_DISABLE,    /* disable SELinux until next reboot */
 117         SEL_MEMBER,     /* compute polyinstantiation membership decision */
 118         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 119         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
 120         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
 121         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
 122         SEL_INO_NEXT,   /* The next inode number to use */
 123 };
 124
 125 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 126
 127 #define SEL_INITCON_INO_OFFSET          0x01000000
 128 #define SEL_BOOL_INO_OFFSET             0x02000000
 129 #define SEL_CLASS_INO_OFFSET            0x04000000
 130 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
 131 #define SEL_INO_MASK                    0x00ffffff
 132
 133 #define TMPBUFLEN       12
 134 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 135                                 size_t count, loff_t *ppos)
 136 {
 137         char tmpbuf[TMPBUFLEN];
 138         ssize_t length;
 139
 140         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 141         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 142 }
 143
 144 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 145 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
 146                                  size_t count, loff_t *ppos)
 147
 148 {
 149         char *page;
 150         ssize_t length;
 151         int new_value;
 152
 153         if (count >= PAGE_SIZE)
 154                 return -ENOMEM;
 155         if (*ppos != 0) {
 156                 /* No partial writes. */
 157                 return -EINVAL;
 158         }
 159         page = (char*)get_zeroed_page(GFP_KERNEL);
 160         if (!page)
 161                 return -ENOMEM;
 162         length = -EFAULT;
 163         if (copy_from_user(page, buf, count))
 164                 goto out;
 165
 166         length = -EINVAL;
 167         if (sscanf(page, "%d", &new_value) != 1)
 168                 goto out;
 169
 170         if (new_value != selinux_enforcing) {
 171                 length = task_has_security(current, SECURITY__SETENFORCE);
 172                 if (length)
 173                         goto out;
 174                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 175                         "enforcing=%d old_enforcing=%d auid=%u ses=%u",
 176                         new_value, selinux_enforcing,
 177                         audit_get_loginuid(current),
 178                         audit_get_sessionid(current));
 179                 selinux_enforcing = new_value;
 180                 if (selinux_enforcing)
 181                         avc_ss_reset(0);
 182                 selnl_notify_setenforce(selinux_enforcing);
 183         }
 184         length = count;
 185 out:
 186         free_page((unsigned long) 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 };
 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 = filp->f_path.dentry->d_inode->i_ino;
 204         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 205                 security_get_reject_unknown() : !security_get_allow_unknown();
 206
 207         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 208         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 209 }
 210
 211 static const struct file_operations sel_handle_unknown_ops = {
 212         .read           = sel_read_handle_unknown,
 213 };
 214
 215 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 216 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
 217                                  size_t count, loff_t *ppos)
 218
 219 {
 220         char *page;
 221         ssize_t length;
 222         int new_value;
 223         extern int selinux_disable(void);
 224
 225         if (count >= PAGE_SIZE)
 226                 return -ENOMEM;
 227         if (*ppos != 0) {
 228                 /* No partial writes. */
 229                 return -EINVAL;
 230         }
 231         page = (char*)get_zeroed_page(GFP_KERNEL);
 232         if (!page)
 233                 return -ENOMEM;
 234         length = -EFAULT;
 235         if (copy_from_user(page, buf, count))
 236                 goto out;
 237
 238         length = -EINVAL;
 239         if (sscanf(page, "%d", &new_value) != 1)
 240                 goto out;
 241
 242         if (new_value) {
 243                 length = selinux_disable();
 244                 if (length < 0)
 245                         goto out;
 246                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 247                         "selinux=0 auid=%u ses=%u",
 248                         audit_get_loginuid(current),
 249                         audit_get_sessionid(current));
 250         }
 251
 252         length = count;
 253 out:
 254         free_page((unsigned long) page);
 255         return length;
 256 }
 257 #else
 258 #define sel_write_disable NULL
 259 #endif
 260
 261 static const struct file_operations sel_disable_ops = {
 262         .write          = sel_write_disable,
 263 };
 264
 265 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 266                                    size_t count, loff_t *ppos)
 267 {
 268         char tmpbuf[TMPBUFLEN];
 269         ssize_t length;
 270
 271         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 272         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 273 }
 274
 275 static const struct file_operations sel_policyvers_ops = {
 276         .read           = sel_read_policyvers,
 277 };
 278
 279 /* declaration for sel_write_load */
 280 static int sel_make_bools(void);
 281 static int sel_make_classes(void);
 282 static int sel_make_policycap(void);
 283
 284 /* declaration for sel_make_class_dirs */
 285 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
 286                         unsigned long *ino);
 287
 288 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 289                                 size_t count, loff_t *ppos)
 290 {
 291         char tmpbuf[TMPBUFLEN];
 292         ssize_t length;
 293
 294         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
 295         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 296 }
 297
 298 static const struct file_operations sel_mls_ops = {
 299         .read           = sel_read_mls,
 300 };
 301
 302 static ssize_t sel_write_load(struct file * file, const char __user * buf,
 303                               size_t count, loff_t *ppos)
 304
 305 {
 306         int ret;
 307         ssize_t length;
 308         void *data = NULL;
 309
 310         mutex_lock(&sel_mutex);
 311
 312         length = task_has_security(current, SECURITY__LOAD_POLICY);
 313         if (length)
 314                 goto out;
 315
 316         if (*ppos != 0) {
 317                 /* No partial writes. */
 318                 length = -EINVAL;
 319                 goto out;
 320         }
 321
 322         if ((count > 64 * 1024 * 1024)
 323             || (data = vmalloc(count)) == NULL) {
 324                 length = -ENOMEM;
 325                 goto out;
 326         }
 327
 328         length = -EFAULT;
 329         if (copy_from_user(data, buf, count) != 0)
 330                 goto out;
 331
 332         length = security_load_policy(data, count);
 333         if (length)
 334                 goto out;
 335
 336         ret = sel_make_bools();
 337         if (ret) {
 338                 length = ret;
 339                 goto out1;
 340         }
 341
 342         ret = sel_make_classes();
 343         if (ret) {
 344                 length = ret;
 345                 goto out1;
 346         }
 347
 348         ret = sel_make_policycap();
 349         if (ret)
 350                 length = ret;
 351         else
 352                 length = count;
 353
 354 out1:
 355
 356         printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
 357                (security_get_reject_unknown() ? "reject" :
 358                 (security_get_allow_unknown() ? "allow" : "deny")));
 359
 360         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 361                 "policy loaded auid=%u ses=%u",
 362                 audit_get_loginuid(current),
 363                 audit_get_sessionid(current));
 364 out:
 365         mutex_unlock(&sel_mutex);
 366         vfree(data);
 367         return length;
 368 }
 369
 370 static const struct file_operations sel_load_ops = {
 371         .write          = sel_write_load,
 372 };
 373
 374 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
 375 {
 376         char *canon;
 377         u32 sid, len;
 378         ssize_t length;
 379
 380         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 381         if (length)
 382                 return length;
 383
 384         length = security_context_to_sid(buf, size, &sid);
 385         if (length < 0)
 386                 return length;
 387
 388         length = security_sid_to_context(sid, &canon, &len);
 389         if (length < 0)
 390                 return length;
 391
 392         if (len > SIMPLE_TRANSACTION_LIMIT) {
 393                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 394                        "max\n", __func__, len);
 395                 length = -ERANGE;
 396                 goto out;
 397         }
 398
 399         memcpy(buf, canon, len);
 400         length = len;
 401 out:
 402         kfree(canon);
 403         return length;
 404 }
 405
 406 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 407                                      size_t count, loff_t *ppos)
 408 {
 409         char tmpbuf[TMPBUFLEN];
 410         ssize_t length;
 411
 412         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 413         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 414 }
 415
 416 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
 417                                       size_t count, loff_t *ppos)
 418 {
 419         char *page;
 420         ssize_t length;
 421         unsigned int new_value;
 422
 423         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 424         if (length)
 425                 return length;
 426
 427         if (count >= PAGE_SIZE)
 428                 return -ENOMEM;
 429         if (*ppos != 0) {
 430                 /* No partial writes. */
 431                 return -EINVAL;
 432         }
 433         page = (char*)get_zeroed_page(GFP_KERNEL);
 434         if (!page)
 435                 return -ENOMEM;
 436         length = -EFAULT;
 437         if (copy_from_user(page, buf, count))
 438                 goto out;
 439
 440         length = -EINVAL;
 441         if (sscanf(page, "%u", &new_value) != 1)
 442                 goto out;
 443
 444         selinux_checkreqprot = new_value ? 1 : 0;
 445         length = count;
 446 out:
 447         free_page((unsigned long) page);
 448         return length;
 449 }
 450 static const struct file_operations sel_checkreqprot_ops = {
 451         .read           = sel_read_checkreqprot,
 452         .write          = sel_write_checkreqprot,
 453 };
 454
 455 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
 456                                    size_t count, loff_t *ppos)
 457 {
 458         char tmpbuf[TMPBUFLEN];
 459         ssize_t length;
 460
 461         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
 462         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 463 }
 464
 465 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
 466                                     size_t count, loff_t *ppos)
 467 {
 468         char *page;
 469         ssize_t length;
 470         int new_value;
 471
 472         length = task_has_security(current, SECURITY__LOAD_POLICY);
 473         if (length)
 474                 return length;
 475
 476         if (count >= PAGE_SIZE)
 477                 return -ENOMEM;
 478         if (*ppos != 0) {
 479                 /* No partial writes. */
 480                 return -EINVAL;
 481         }
 482         page = (char*)get_zeroed_page(GFP_KERNEL);
 483         if (!page)
 484                 return -ENOMEM;
 485         length = -EFAULT;
 486         if (copy_from_user(page, buf, count))
 487                 goto out;
 488
 489         length = -EINVAL;
 490         if (sscanf(page, "%d", &new_value) != 1)
 491                 goto out;
 492
 493         selinux_compat_net = new_value ? 1 : 0;
 494         length = count;
 495 out:
 496         free_page((unsigned long) page);
 497         return length;
 498 }
 499 static const struct file_operations sel_compat_net_ops = {
 500         .read           = sel_read_compat_net,
 501         .write          = sel_write_compat_net,
 502 };
 503
 504 /*
 505  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 506  */
 507 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
 508 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
 509 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
 510 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
 511 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
 512
 513 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 514         [SEL_ACCESS] = sel_write_access,
 515         [SEL_CREATE] = sel_write_create,
 516         [SEL_RELABEL] = sel_write_relabel,
 517         [SEL_USER] = sel_write_user,
 518         [SEL_MEMBER] = sel_write_member,
 519         [SEL_CONTEXT] = sel_write_context,
 520 };
 521
 522 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 523 {
 524         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 525         char *data;
 526         ssize_t rv;
 527
 528         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 529                 return -EINVAL;
 530
 531         data = simple_transaction_get(file, buf, size);
 532         if (IS_ERR(data))
 533                 return PTR_ERR(data);
 534
 535         rv =  write_op[ino](file, data, size);
 536         if (rv>0) {
 537                 simple_transaction_set(file, rv);
 538                 rv = size;
 539         }
 540         return rv;
 541 }
 542
 543 static const struct file_operations transaction_ops = {
 544         .write          = selinux_transaction_write,
 545         .read           = simple_transaction_read,
 546         .release        = simple_transaction_release,
 547 };
 548
 549 /*
 550  * payload - write methods
 551  * If the method has a response, the response should be put in buf,
 552  * and the length returned.  Otherwise return 0 or and -error.
 553  */
 554
 555 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
 556 {
 557         char *scon, *tcon;
 558         u32 ssid, tsid;
 559         u16 tclass;
 560         u32 req;
 561         struct av_decision avd;
 562         ssize_t length;
 563
 564         length = task_has_security(current, SECURITY__COMPUTE_AV);
 565         if (length)
 566                 return length;
 567
 568         length = -ENOMEM;
 569         scon = kzalloc(size+1, GFP_KERNEL);
 570         if (!scon)
 571                 return length;
 572
 573         tcon = kzalloc(size+1, GFP_KERNEL);
 574         if (!tcon)
 575                 goto out;
 576
 577         length = -EINVAL;
 578         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
 579                 goto out2;
 580
 581         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 582         if (length < 0)
 583                 goto out2;
 584         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 585         if (length < 0)
 586                 goto out2;
 587
 588         length = security_compute_av(ssid, tsid, tclass, req, &avd);
 589         if (length < 0)
 590                 goto out2;
 591
 592         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 593                           "%x %x %x %x %u",
 594                           avd.allowed, avd.decided,
 595                           avd.auditallow, avd.auditdeny,
 596                           avd.seqno);
 597 out2:
 598         kfree(tcon);
 599 out:
 600         kfree(scon);
 601         return length;
 602 }
 603
 604 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
 605 {
 606         char *scon, *tcon;
 607         u32 ssid, tsid, newsid;
 608         u16 tclass;
 609         ssize_t length;
 610         char *newcon;
 611         u32 len;
 612
 613         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 614         if (length)
 615                 return length;
 616
 617         length = -ENOMEM;
 618         scon = kzalloc(size+1, GFP_KERNEL);
 619         if (!scon)
 620                 return length;
 621
 622         tcon = kzalloc(size+1, GFP_KERNEL);
 623         if (!tcon)
 624                 goto out;
 625
 626         length = -EINVAL;
 627         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 628                 goto out2;
 629
 630         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 631         if (length < 0)
 632                 goto out2;
 633         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 634         if (length < 0)
 635                 goto out2;
 636
 637         length = security_transition_sid(ssid, tsid, tclass, &newsid);
 638         if (length < 0)
 639                 goto out2;
 640
 641         length = security_sid_to_context(newsid, &newcon, &len);
 642         if (length < 0)
 643                 goto out2;
 644
 645         if (len > SIMPLE_TRANSACTION_LIMIT) {
 646                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 647                        "max\n", __func__, len);
 648                 length = -ERANGE;
 649                 goto out3;
 650         }
 651
 652         memcpy(buf, newcon, len);
 653         length = len;
 654 out3:
 655         kfree(newcon);
 656 out2:
 657         kfree(tcon);
 658 out:
 659         kfree(scon);
 660         return length;
 661 }
 662
 663 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
 664 {
 665         char *scon, *tcon;
 666         u32 ssid, tsid, newsid;
 667         u16 tclass;
 668         ssize_t length;
 669         char *newcon;
 670         u32 len;
 671
 672         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 673         if (length)
 674                 return length;
 675
 676         length = -ENOMEM;
 677         scon = kzalloc(size+1, GFP_KERNEL);
 678         if (!scon)
 679                 return length;
 680
 681         tcon = kzalloc(size+1, GFP_KERNEL);
 682         if (!tcon)
 683                 goto out;
 684
 685         length = -EINVAL;
 686         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 687                 goto out2;
 688
 689         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 690         if (length < 0)
 691                 goto out2;
 692         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 693         if (length < 0)
 694                 goto out2;
 695
 696         length = security_change_sid(ssid, tsid, tclass, &newsid);
 697         if (length < 0)
 698                 goto out2;
 699
 700         length = security_sid_to_context(newsid, &newcon, &len);
 701         if (length < 0)
 702                 goto out2;
 703
 704         if (len > SIMPLE_TRANSACTION_LIMIT) {
 705                 length = -ERANGE;
 706                 goto out3;
 707         }
 708
 709         memcpy(buf, newcon, len);
 710         length = len;
 711 out3:
 712         kfree(newcon);
 713 out2:
 714         kfree(tcon);
 715 out:
 716         kfree(scon);
 717         return length;
 718 }
 719
 720 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
 721 {
 722         char *con, *user, *ptr;
 723         u32 sid, *sids;
 724         ssize_t length;
 725         char *newcon;
 726         int i, rc;
 727         u32 len, nsids;
 728
 729         length = task_has_security(current, SECURITY__COMPUTE_USER);
 730         if (length)
 731                 return length;
 732
 733         length = -ENOMEM;
 734         con = kzalloc(size+1, GFP_KERNEL);
 735         if (!con)
 736                 return length;
 737
 738         user = kzalloc(size+1, GFP_KERNEL);
 739         if (!user)
 740                 goto out;
 741
 742         length = -EINVAL;
 743         if (sscanf(buf, "%s %s", con, user) != 2)
 744                 goto out2;
 745
 746         length = security_context_to_sid(con, strlen(con)+1, &sid);
 747         if (length < 0)
 748                 goto out2;
 749
 750         length = security_get_user_sids(sid, user, &sids, &nsids);
 751         if (length < 0)
 752                 goto out2;
 753
 754         length = sprintf(buf, "%u", nsids) + 1;
 755         ptr = buf + length;
 756         for (i = 0; i < nsids; i++) {
 757                 rc = security_sid_to_context(sids[i], &newcon, &len);
 758                 if (rc) {
 759                         length = rc;
 760                         goto out3;
 761                 }
 762                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 763                         kfree(newcon);
 764                         length = -ERANGE;
 765                         goto out3;
 766                 }
 767                 memcpy(ptr, newcon, len);
 768                 kfree(newcon);
 769                 ptr += len;
 770                 length += len;
 771         }
 772 out3:
 773         kfree(sids);
 774 out2:
 775         kfree(user);
 776 out:
 777         kfree(con);
 778         return length;
 779 }
 780
 781 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
 782 {
 783         char *scon, *tcon;
 784         u32 ssid, tsid, newsid;
 785         u16 tclass;
 786         ssize_t length;
 787         char *newcon;
 788         u32 len;
 789
 790         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 791         if (length)
 792                 return length;
 793
 794         length = -ENOMEM;
 795         scon = kzalloc(size+1, GFP_KERNEL);
 796         if (!scon)
 797                 return length;
 798
 799         tcon = kzalloc(size+1, GFP_KERNEL);
 800         if (!tcon)
 801                 goto out;
 802
 803         length = -EINVAL;
 804         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 805                 goto out2;
 806
 807         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 808         if (length < 0)
 809                 goto out2;
 810         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 811         if (length < 0)
 812                 goto out2;
 813
 814         length = security_member_sid(ssid, tsid, tclass, &newsid);
 815         if (length < 0)
 816                 goto out2;
 817
 818         length = security_sid_to_context(newsid, &newcon, &len);
 819         if (length < 0)
 820                 goto out2;
 821
 822         if (len > SIMPLE_TRANSACTION_LIMIT) {
 823                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 824                        "max\n", __func__, len);
 825                 length = -ERANGE;
 826                 goto out3;
 827         }
 828
 829         memcpy(buf, newcon, len);
 830         length = len;
 831 out3:
 832         kfree(newcon);
 833 out2:
 834         kfree(tcon);
 835 out:
 836         kfree(scon);
 837         return length;
 838 }
 839
 840 static struct inode *sel_make_inode(struct super_block *sb, int mode)
 841 {
 842         struct inode *ret = new_inode(sb);
 843
 844         if (ret) {
 845                 ret->i_mode = mode;
 846                 ret->i_uid = ret->i_gid = 0;
 847                 ret->i_blocks = 0;
 848                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
 849         }
 850         return ret;
 851 }
 852
 853 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 854                              size_t count, loff_t *ppos)
 855 {
 856         char *page = NULL;
 857         ssize_t length;
 858         ssize_t ret;
 859         int cur_enforcing;
 860         struct inode *inode = filep->f_path.dentry->d_inode;
 861         unsigned index = inode->i_ino & SEL_INO_MASK;
 862         const char *name = filep->f_path.dentry->d_name.name;
 863
 864         mutex_lock(&sel_mutex);
 865
 866         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
 867                 ret = -EINVAL;
 868                 goto out;
 869         }
 870
 871         if (count > PAGE_SIZE) {
 872                 ret = -EINVAL;
 873                 goto out;
 874         }
 875         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
 876                 ret = -ENOMEM;
 877                 goto out;
 878         }
 879
 880         cur_enforcing = security_get_bool_value(index);
 881         if (cur_enforcing < 0) {
 882                 ret = cur_enforcing;
 883                 goto out;
 884         }
 885         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
 886                           bool_pending_values[index]);
 887         ret = simple_read_from_buffer(buf, count, ppos, page, length);
 888 out:
 889         mutex_unlock(&sel_mutex);
 890         if (page)
 891                 free_page((unsigned long)page);
 892         return ret;
 893 }
 894
 895 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
 896                               size_t count, loff_t *ppos)
 897 {
 898         char *page = NULL;
 899         ssize_t length;
 900         int new_value;
 901         struct inode *inode = filep->f_path.dentry->d_inode;
 902         unsigned index = inode->i_ino & SEL_INO_MASK;
 903         const char *name = filep->f_path.dentry->d_name.name;
 904
 905         mutex_lock(&sel_mutex);
 906
 907         length = task_has_security(current, SECURITY__SETBOOL);
 908         if (length)
 909                 goto out;
 910
 911         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
 912                 length = -EINVAL;
 913                 goto out;
 914         }
 915
 916         if (count >= PAGE_SIZE) {
 917                 length = -ENOMEM;
 918                 goto out;
 919         }
 920
 921         if (*ppos != 0) {
 922                 /* No partial writes. */
 923                 length = -EINVAL;
 924                 goto out;
 925         }
 926         page = (char*)get_zeroed_page(GFP_KERNEL);
 927         if (!page) {
 928                 length = -ENOMEM;
 929                 goto out;
 930         }
 931
 932         length = -EFAULT;
 933         if (copy_from_user(page, buf, count))
 934                 goto out;
 935
 936         length = -EINVAL;
 937         if (sscanf(page, "%d", &new_value) != 1)
 938                 goto out;
 939
 940         if (new_value)
 941                 new_value = 1;
 942
 943         bool_pending_values[index] = new_value;
 944         length = count;
 945
 946 out:
 947         mutex_unlock(&sel_mutex);
 948         if (page)
 949                 free_page((unsigned long) page);
 950         return length;
 951 }
 952
 953 static const struct file_operations sel_bool_ops = {
 954         .read           = sel_read_bool,
 955         .write          = sel_write_bool,
 956 };
 957
 958 static ssize_t sel_commit_bools_write(struct file *filep,
 959                                       const char __user *buf,
 960                                       size_t count, loff_t *ppos)
 961 {
 962         char *page = NULL;
 963         ssize_t length;
 964         int new_value;
 965
 966         mutex_lock(&sel_mutex);
 967
 968         length = task_has_security(current, SECURITY__SETBOOL);
 969         if (length)
 970                 goto out;
 971
 972         if (count >= PAGE_SIZE) {
 973                 length = -ENOMEM;
 974                 goto out;
 975         }
 976         if (*ppos != 0) {
 977                 /* No partial writes. */
 978                 goto out;
 979         }
 980         page = (char*)get_zeroed_page(GFP_KERNEL);
 981         if (!page) {
 982                 length = -ENOMEM;
 983                 goto out;
 984         }
 985
 986         length = -EFAULT;
 987         if (copy_from_user(page, buf, count))
 988                 goto out;
 989
 990         length = -EINVAL;
 991         if (sscanf(page, "%d", &new_value) != 1)
 992                 goto out;
 993
 994         if (new_value && bool_pending_values) {
 995                 security_set_bools(bool_num, bool_pending_values);
 996         }
 997
 998         length = count;
 999
1000 out:
1001         mutex_unlock(&sel_mutex);
1002         if (page)
1003                 free_page((unsigned long) page);
1004         return length;
1005 }
1006
1007 static const struct file_operations sel_commit_bools_ops = {
1008         .write          = sel_commit_bools_write,
1009 };
1010
1011 static void sel_remove_entries(struct dentry *de)
1012 {
1013         struct list_head *node;
1014
1015         spin_lock(&dcache_lock);
1016         node = de->d_subdirs.next;
1017         while (node != &de->d_subdirs) {
1018                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1019                 list_del_init(node);
1020
1021                 if (d->d_inode) {
1022                         d = dget_locked(d);
1023                         spin_unlock(&dcache_lock);
1024                         d_delete(d);
1025                         simple_unlink(de->d_inode, d);
1026                         dput(d);
1027                         spin_lock(&dcache_lock);
1028                 }
1029                 node = de->d_subdirs.next;
1030         }
1031
1032         spin_unlock(&dcache_lock);
1033 }
1034
1035 #define BOOL_DIR_NAME "booleans"
1036
1037 static int sel_make_bools(void)
1038 {
1039         int i, ret = 0;
1040         ssize_t len;
1041         struct dentry *dentry = NULL;
1042         struct dentry *dir = bool_dir;
1043         struct inode *inode = NULL;
1044         struct inode_security_struct *isec;
1045         char **names = NULL, *page;
1046         int num;
1047         int *values = NULL;
1048         u32 sid;
1049
1050         /* remove any existing files */
1051         kfree(bool_pending_names);
1052         kfree(bool_pending_values);
1053         bool_pending_names = NULL;
1054         bool_pending_values = NULL;
1055
1056         sel_remove_entries(dir);
1057
1058         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1059                 return -ENOMEM;
1060
1061         ret = security_get_bools(&num, &names, &values);
1062         if (ret != 0)
1063                 goto out;
1064
1065         for (i = 0; i < num; i++) {
1066                 dentry = d_alloc_name(dir, names[i]);
1067                 if (!dentry) {
1068                         ret = -ENOMEM;
1069                         goto err;
1070                 }
1071                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1072                 if (!inode) {
1073                         ret = -ENOMEM;
1074                         goto err;
1075                 }
1076
1077                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1078                 if (len < 0) {
1079                         ret = -EINVAL;
1080                         goto err;
1081                 } else if (len >= PAGE_SIZE) {
1082                         ret = -ENAMETOOLONG;
1083                         goto err;
1084                 }
1085                 isec = (struct inode_security_struct*)inode->i_security;
1086                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1087                         goto err;
1088                 isec->sid = sid;
1089                 isec->initialized = 1;
1090                 inode->i_fop = &sel_bool_ops;
1091                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1092                 d_add(dentry, inode);
1093         }
1094         bool_num = num;
1095         bool_pending_names = names;
1096         bool_pending_values = values;
1097 out:
1098         free_page((unsigned long)page);
1099         return ret;
1100 err:
1101         if (names) {
1102                 for (i = 0; i < num; i++)
1103                         kfree(names[i]);
1104                 kfree(names);
1105         }
1106         kfree(values);
1107         sel_remove_entries(dir);
1108         ret = -ENOMEM;
1109         goto out;
1110 }
1111
1112 #define NULL_FILE_NAME "null"
1113
1114 struct dentry *selinux_null = NULL;
1115
1116 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1117                                             size_t count, loff_t *ppos)
1118 {
1119         char tmpbuf[TMPBUFLEN];
1120         ssize_t length;
1121
1122         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1123         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1124 }
1125
1126 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1127                                              const char __user * buf,
1128                                              size_t count, loff_t *ppos)
1129
1130 {
1131         char *page;
1132         ssize_t ret;
1133         int new_value;
1134
1135         if (count >= PAGE_SIZE) {
1136                 ret = -ENOMEM;
1137                 goto out;
1138         }
1139
1140         if (*ppos != 0) {
1141                 /* No partial writes. */
1142                 ret = -EINVAL;
1143                 goto out;
1144         }
1145
1146         page = (char*)get_zeroed_page(GFP_KERNEL);
1147         if (!page) {
1148                 ret = -ENOMEM;
1149                 goto out;
1150         }
1151
1152         if (copy_from_user(page, buf, count)) {
1153                 ret = -EFAULT;
1154                 goto out_free;
1155         }
1156
1157         if (sscanf(page, "%u", &new_value) != 1) {
1158                 ret = -EINVAL;
1159                 goto out;
1160         }
1161
1162         if (new_value != avc_cache_threshold) {
1163                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1164                 if (ret)
1165                         goto out_free;
1166                 avc_cache_threshold = new_value;
1167         }
1168         ret = count;
1169 out_free:
1170         free_page((unsigned long)page);
1171 out:
1172         return ret;
1173 }
1174
1175 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1176                                        size_t count, loff_t *ppos)
1177 {
1178         char *page;
1179         ssize_t ret = 0;
1180
1181         page = (char *)__get_free_page(GFP_KERNEL);
1182         if (!page) {
1183                 ret = -ENOMEM;
1184                 goto out;
1185         }
1186         ret = avc_get_hash_stats(page);
1187         if (ret >= 0)
1188                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1189         free_page((unsigned long)page);
1190 out:
1191         return ret;
1192 }
1193
1194 static const struct file_operations sel_avc_cache_threshold_ops = {
1195         .read           = sel_read_avc_cache_threshold,
1196         .write          = sel_write_avc_cache_threshold,
1197 };
1198
1199 static const struct file_operations sel_avc_hash_stats_ops = {
1200         .read           = sel_read_avc_hash_stats,
1201 };
1202
1203 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1204 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1205 {
1206         int cpu;
1207
1208         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1209                 if (!cpu_possible(cpu))
1210                         continue;
1211                 *idx = cpu + 1;
1212                 return &per_cpu(avc_cache_stats, cpu);
1213         }
1214         return NULL;
1215 }
1216
1217 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1218 {
1219         loff_t n = *pos - 1;
1220
1221         if (*pos == 0)
1222                 return SEQ_START_TOKEN;
1223
1224         return sel_avc_get_stat_idx(&n);
1225 }
1226
1227 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1228 {
1229         return sel_avc_get_stat_idx(pos);
1230 }
1231
1232 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1233 {
1234         struct avc_cache_stats *st = v;
1235
1236         if (v == SEQ_START_TOKEN)
1237                 seq_printf(seq, "lookups hits misses allocations reclaims "
1238                            "frees\n");
1239         else
1240                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1241                            st->hits, st->misses, st->allocations,
1242                            st->reclaims, st->frees);
1243         return 0;
1244 }
1245
1246 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1247 { }
1248
1249 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1250         .start          = sel_avc_stats_seq_start,
1251         .next           = sel_avc_stats_seq_next,
1252         .show           = sel_avc_stats_seq_show,
1253         .stop           = sel_avc_stats_seq_stop,
1254 };
1255
1256 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1257 {
1258         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1259 }
1260
1261 static const struct file_operations sel_avc_cache_stats_ops = {
1262         .open           = sel_open_avc_cache_stats,
1263         .read           = seq_read,
1264         .llseek         = seq_lseek,
1265         .release        = seq_release,
1266 };
1267 #endif
1268
1269 static int sel_make_avc_files(struct dentry *dir)
1270 {
1271         int i, ret = 0;
1272         static struct tree_descr files[] = {
1273                 { "cache_threshold",
1274                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1275                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1276 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1277                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1278 #endif
1279         };
1280
1281         for (i = 0; i < ARRAY_SIZE(files); i++) {
1282                 struct inode *inode;
1283                 struct dentry *dentry;
1284
1285                 dentry = d_alloc_name(dir, files[i].name);
1286                 if (!dentry) {
1287                         ret = -ENOMEM;
1288                         goto out;
1289                 }
1290
1291                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1292                 if (!inode) {
1293                         ret = -ENOMEM;
1294                         goto out;
1295                 }
1296                 inode->i_fop = files[i].ops;
1297                 inode->i_ino = ++sel_last_ino;
1298                 d_add(dentry, inode);
1299         }
1300 out:
1301         return ret;
1302 }
1303
1304 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1305                                 size_t count, loff_t *ppos)
1306 {
1307         struct inode *inode;
1308         char *con;
1309         u32 sid, len;
1310         ssize_t ret;
1311
1312         inode = file->f_path.dentry->d_inode;
1313         sid = inode->i_ino&SEL_INO_MASK;
1314         ret = security_sid_to_context(sid, &con, &len);
1315         if (ret < 0)
1316                 return ret;
1317
1318         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1319         kfree(con);
1320         return ret;
1321 }
1322
1323 static const struct file_operations sel_initcon_ops = {
1324         .read           = sel_read_initcon,
1325 };
1326
1327 static int sel_make_initcon_files(struct dentry *dir)
1328 {
1329         int i, ret = 0;
1330
1331         for (i = 1; i <= SECINITSID_NUM; i++) {
1332                 struct inode *inode;
1333                 struct dentry *dentry;
1334                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1335                 if (!dentry) {
1336                         ret = -ENOMEM;
1337                         goto out;
1338                 }
1339
1340                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1341                 if (!inode) {
1342                         ret = -ENOMEM;
1343                         goto out;
1344                 }
1345                 inode->i_fop = &sel_initcon_ops;
1346                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1347                 d_add(dentry, inode);
1348         }
1349 out:
1350         return ret;
1351 }
1352
1353 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1354 {
1355         return a / b - (a % b < 0);
1356 }
1357
1358 static inline unsigned long sel_class_to_ino(u16 class)
1359 {
1360         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1361 }
1362
1363 static inline u16 sel_ino_to_class(unsigned long ino)
1364 {
1365         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1366 }
1367
1368 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1369 {
1370         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1371 }
1372
1373 static inline u32 sel_ino_to_perm(unsigned long ino)
1374 {
1375         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1376 }
1377
1378 static ssize_t sel_read_class(struct file * file, char __user *buf,
1379                                 size_t count, loff_t *ppos)
1380 {
1381         ssize_t rc, len;
1382         char *page;
1383         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1384
1385         page = (char *)__get_free_page(GFP_KERNEL);
1386         if (!page) {
1387                 rc = -ENOMEM;
1388                 goto out;
1389         }
1390
1391         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1392         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1393         free_page((unsigned long)page);
1394 out:
1395         return rc;
1396 }
1397
1398 static const struct file_operations sel_class_ops = {
1399         .read           = sel_read_class,
1400 };
1401
1402 static ssize_t sel_read_perm(struct file * file, char __user *buf,
1403                                 size_t count, loff_t *ppos)
1404 {
1405         ssize_t rc, len;
1406         char *page;
1407         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1408
1409         page = (char *)__get_free_page(GFP_KERNEL);
1410         if (!page) {
1411                 rc = -ENOMEM;
1412                 goto out;
1413         }
1414
1415         len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino));
1416         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1417         free_page((unsigned long)page);
1418 out:
1419         return rc;
1420 }
1421
1422 static const struct file_operations sel_perm_ops = {
1423         .read           = sel_read_perm,
1424 };
1425
1426 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1427                                   size_t count, loff_t *ppos)
1428 {
1429         int value;
1430         char tmpbuf[TMPBUFLEN];
1431         ssize_t length;
1432         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1433
1434         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1435         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1436
1437         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1438 }
1439
1440 static const struct file_operations sel_policycap_ops = {
1441         .read           = sel_read_policycap,
1442 };
1443
1444 static int sel_make_perm_files(char *objclass, int classvalue,
1445                                 struct dentry *dir)
1446 {
1447         int i, rc = 0, nperms;
1448         char **perms;
1449
1450         rc = security_get_permissions(objclass, &perms, &nperms);
1451         if (rc)
1452                 goto out;
1453
1454         for (i = 0; i < nperms; i++) {
1455                 struct inode *inode;
1456                 struct dentry *dentry;
1457
1458                 dentry = d_alloc_name(dir, perms[i]);
1459                 if (!dentry) {
1460                         rc = -ENOMEM;
1461                         goto out1;
1462                 }
1463
1464                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1465                 if (!inode) {
1466                         rc = -ENOMEM;
1467                         goto out1;
1468                 }
1469                 inode->i_fop = &sel_perm_ops;
1470                 /* i+1 since perm values are 1-indexed */
1471                 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1472                 d_add(dentry, inode);
1473         }
1474
1475 out1:
1476         for (i = 0; i < nperms; i++)
1477                 kfree(perms[i]);
1478         kfree(perms);
1479 out:
1480         return rc;
1481 }
1482
1483 static int sel_make_class_dir_entries(char *classname, int index,
1484                                         struct dentry *dir)
1485 {
1486         struct dentry *dentry = NULL;
1487         struct inode *inode = NULL;
1488         int rc;
1489
1490         dentry = d_alloc_name(dir, "index");
1491         if (!dentry) {
1492                 rc = -ENOMEM;
1493                 goto out;
1494         }
1495
1496         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1497         if (!inode) {
1498                 rc = -ENOMEM;
1499                 goto out;
1500         }
1501
1502         inode->i_fop = &sel_class_ops;
1503         inode->i_ino = sel_class_to_ino(index);
1504         d_add(dentry, inode);
1505
1506         dentry = d_alloc_name(dir, "perms");
1507         if (!dentry) {
1508                 rc = -ENOMEM;
1509                 goto out;
1510         }
1511
1512         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1513         if (rc)
1514                 goto out;
1515
1516         rc = sel_make_perm_files(classname, index, dentry);
1517
1518 out:
1519         return rc;
1520 }
1521
1522 static void sel_remove_classes(void)
1523 {
1524         struct list_head *class_node;
1525
1526         list_for_each(class_node, &class_dir->d_subdirs) {
1527                 struct dentry *class_subdir = list_entry(class_node,
1528                                         struct dentry, d_u.d_child);
1529                 struct list_head *class_subdir_node;
1530
1531                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1532                         struct dentry *d = list_entry(class_subdir_node,
1533                                                 struct dentry, d_u.d_child);
1534
1535                         if (d->d_inode)
1536                                 if (d->d_inode->i_mode & S_IFDIR)
1537                                         sel_remove_entries(d);
1538                 }
1539
1540                 sel_remove_entries(class_subdir);
1541         }
1542
1543         sel_remove_entries(class_dir);
1544 }
1545
1546 static int sel_make_classes(void)
1547 {
1548         int rc = 0, nclasses, i;
1549         char **classes;
1550
1551         /* delete any existing entries */
1552         sel_remove_classes();
1553
1554         rc = security_get_classes(&classes, &nclasses);
1555         if (rc < 0)
1556                 goto out;
1557
1558         /* +2 since classes are 1-indexed */
1559         last_class_ino = sel_class_to_ino(nclasses+2);
1560
1561         for (i = 0; i < nclasses; i++) {
1562                 struct dentry *class_name_dir;
1563
1564                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1565                 if (!class_name_dir) {
1566                         rc = -ENOMEM;
1567                         goto out1;
1568                 }
1569
1570                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1571                                 &last_class_ino);
1572                 if (rc)
1573                         goto out1;
1574
1575                 /* i+1 since class values are 1-indexed */
1576                 rc = sel_make_class_dir_entries(classes[i], i+1,
1577                                 class_name_dir);
1578                 if (rc)
1579                         goto out1;
1580         }
1581
1582 out1:
1583         for (i = 0; i < nclasses; i++)
1584                 kfree(classes[i]);
1585         kfree(classes);
1586 out:
1587         return rc;
1588 }
1589
1590 static int sel_make_policycap(void)
1591 {
1592         unsigned int iter;
1593         struct dentry *dentry = NULL;
1594         struct inode *inode = NULL;
1595
1596         sel_remove_entries(policycap_dir);
1597
1598         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1599                 if (iter < ARRAY_SIZE(policycap_names))
1600                         dentry = d_alloc_name(policycap_dir,
1601                                               policycap_names[iter]);
1602                 else
1603                         dentry = d_alloc_name(policycap_dir, "unknown");
1604
1605                 if (dentry == NULL)
1606                         return -ENOMEM;
1607
1608                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1609                 if (inode == NULL)
1610                         return -ENOMEM;
1611
1612                 inode->i_fop = &sel_policycap_ops;
1613                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1614                 d_add(dentry, inode);
1615         }
1616
1617         return 0;
1618 }
1619
1620 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1621                         unsigned long *ino)
1622 {
1623         int ret = 0;
1624         struct inode *inode;
1625
1626         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1627         if (!inode) {
1628                 ret = -ENOMEM;
1629                 goto out;
1630         }
1631         inode->i_op = &simple_dir_inode_operations;
1632         inode->i_fop = &simple_dir_operations;
1633         inode->i_ino = ++(*ino);
1634         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1635         inc_nlink(inode);
1636         d_add(dentry, inode);
1637         /* bump link count on parent directory, too */
1638         inc_nlink(dir);
1639 out:
1640         return ret;
1641 }
1642
1643 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1644 {
1645         int ret;
1646         struct dentry *dentry;
1647         struct inode *inode, *root_inode;
1648         struct inode_security_struct *isec;
1649
1650         static struct tree_descr selinux_files[] = {
1651                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1652                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1653                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1654                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1655                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1656                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1657                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1658                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1659                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1660                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1661                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1662                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1663                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1664                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1665                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1666                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1667                 /* last one */ {""}
1668         };
1669         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1670         if (ret)
1671                 goto err;
1672
1673         root_inode = sb->s_root->d_inode;
1674
1675         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1676         if (!dentry) {
1677                 ret = -ENOMEM;
1678                 goto err;
1679         }
1680
1681         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1682         if (ret)
1683                 goto err;
1684
1685         bool_dir = dentry;
1686
1687         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1688         if (!dentry) {
1689                 ret = -ENOMEM;
1690                 goto err;
1691         }
1692
1693         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1694         if (!inode) {
1695                 ret = -ENOMEM;
1696                 goto err;
1697         }
1698         inode->i_ino = ++sel_last_ino;
1699         isec = (struct inode_security_struct*)inode->i_security;
1700         isec->sid = SECINITSID_DEVNULL;
1701         isec->sclass = SECCLASS_CHR_FILE;
1702         isec->initialized = 1;
1703
1704         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1705         d_add(dentry, inode);
1706         selinux_null = dentry;
1707
1708         dentry = d_alloc_name(sb->s_root, "avc");
1709         if (!dentry) {
1710                 ret = -ENOMEM;
1711                 goto err;
1712         }
1713
1714         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1715         if (ret)
1716                 goto err;
1717
1718         ret = sel_make_avc_files(dentry);
1719         if (ret)
1720                 goto err;
1721
1722         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1723         if (!dentry) {
1724                 ret = -ENOMEM;
1725                 goto err;
1726         }
1727
1728         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1729         if (ret)
1730                 goto err;
1731
1732         ret = sel_make_initcon_files(dentry);
1733         if (ret)
1734                 goto err;
1735
1736         dentry = d_alloc_name(sb->s_root, "class");
1737         if (!dentry) {
1738                 ret = -ENOMEM;
1739                 goto err;
1740         }
1741
1742         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1743         if (ret)
1744                 goto err;
1745
1746         class_dir = dentry;
1747
1748         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1749         if (!dentry) {
1750                 ret = -ENOMEM;
1751                 goto err;
1752         }
1753
1754         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1755         if (ret)
1756                 goto err;
1757
1758         policycap_dir = dentry;
1759
1760 out:
1761         return ret;
1762 err:
1763         printk(KERN_ERR "%s:  failed while creating inodes\n", __func__);
1764         goto out;
1765 }
1766
1767 static int sel_get_sb(struct file_system_type *fs_type,
1768                       int flags, const char *dev_name, void *data,
1769                       struct vfsmount *mnt)
1770 {
1771         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1772 }
1773
1774 static struct file_system_type sel_fs_type = {
1775         .name           = "selinuxfs",
1776         .get_sb         = sel_get_sb,
1777         .kill_sb        = kill_litter_super,
1778 };
1779
1780 struct vfsmount *selinuxfs_mount;
1781
1782 static int __init init_sel_fs(void)
1783 {
1784         int err;
1785
1786         if (!selinux_enabled)
1787                 return 0;
1788         err = register_filesystem(&sel_fs_type);
1789         if (!err) {
1790                 selinuxfs_mount = kern_mount(&sel_fs_type);
1791                 if (IS_ERR(selinuxfs_mount)) {
1792                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1793                         err = PTR_ERR(selinuxfs_mount);
1794                         selinuxfs_mount = NULL;
1795                 }
1796         }
1797         return err;
1798 }
1799
1800 __initcall(init_sel_fs);
1801
1802 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1803 void exit_sel_fs(void)
1804 {
1805         unregister_filesystem(&sel_fs_type);
1806 }
1807 #endif