git.oblomov.eu Git - linux-2.6/blob - 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 <linux/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 int selinux_compat_net = 0;
  51
  52 static int __init checkreqprot_setup(char *str)
  53 {
  54         unsigned long checkreqprot;
  55         if (!strict_strtoul(str, 0, &checkreqprot))
  56                 selinux_checkreqprot = checkreqprot ? 1 : 0;
  57         return 1;
  58 }
  59 __setup("checkreqprot=", checkreqprot_setup);
  60
  61 static int __init selinux_compat_net_setup(char *str)
  62 {
  63         unsigned long compat_net;
  64         if (!strict_strtoul(str, 0, &compat_net))
  65                 selinux_compat_net = compat_net ? 1 : 0;
  66         return 1;
  67 }
  68 __setup("selinux_compat_net=", selinux_compat_net_setup);
  69
  70
  71 static DEFINE_MUTEX(sel_mutex);
  72
  73 /* global data for booleans */
  74 static struct dentry *bool_dir;
  75 static int bool_num;
  76 static char **bool_pending_names;
  77 static int *bool_pending_values;
  78
  79 /* global data for classes */
  80 static struct dentry *class_dir;
  81 static unsigned long last_class_ino;
  82
  83 /* global data for policy capabilities */
  84 static struct dentry *policycap_dir;
  85
  86 extern void selnl_notify_setenforce(int val);
  87
  88 /* Check whether a task is allowed to use a security operation. */
  89 static int task_has_security(struct task_struct *tsk,
  90                              u32 perms)
  91 {
  92         const struct task_security_struct *tsec;
  93         u32 sid = 0;
  94
  95         rcu_read_lock();
  96         tsec = __task_cred(tsk)->security;
  97         if (tsec)
  98                 sid = tsec->sid;
  99         rcu_read_unlock();
 100         if (!tsec)
 101                 return -EACCES;
 102
 103         return avc_has_perm(sid, SECINITSID_SECURITY,
 104                             SECCLASS_SECURITY, perms, NULL);
 105 }
 106
 107 enum sel_inos {
 108         SEL_ROOT_INO = 2,
 109         SEL_LOAD,       /* load policy */
 110         SEL_ENFORCE,    /* get or set enforcing status */
 111         SEL_CONTEXT,    /* validate context */
 112         SEL_ACCESS,     /* compute access decision */
 113         SEL_CREATE,     /* compute create labeling decision */
 114         SEL_RELABEL,    /* compute relabeling decision */
 115         SEL_USER,       /* compute reachable user contexts */
 116         SEL_POLICYVERS, /* return policy version for this kernel */
 117         SEL_COMMIT_BOOLS, /* commit new boolean values */
 118         SEL_MLS,        /* return if MLS policy is enabled */
 119         SEL_DISABLE,    /* disable SELinux until next reboot */
 120         SEL_MEMBER,     /* compute polyinstantiation membership decision */
 121         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 122         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
 123         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
 124         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
 125         SEL_INO_NEXT,   /* The next inode number to use */
 126 };
 127
 128 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 129
 130 #define SEL_INITCON_INO_OFFSET          0x01000000
 131 #define SEL_BOOL_INO_OFFSET             0x02000000
 132 #define SEL_CLASS_INO_OFFSET            0x04000000
 133 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
 134 #define SEL_INO_MASK                    0x00ffffff
 135
 136 #define TMPBUFLEN       12
 137 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 138                                 size_t count, loff_t *ppos)
 139 {
 140         char tmpbuf[TMPBUFLEN];
 141         ssize_t length;
 142
 143         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 144         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 145 }
 146
 147 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 148 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
 149                                  size_t count, loff_t *ppos)
 150
 151 {
 152         char *page;
 153         ssize_t length;
 154         int new_value;
 155
 156         if (count >= PAGE_SIZE)
 157                 return -ENOMEM;
 158         if (*ppos != 0) {
 159                 /* No partial writes. */
 160                 return -EINVAL;
 161         }
 162         page = (char *)get_zeroed_page(GFP_KERNEL);
 163         if (!page)
 164                 return -ENOMEM;
 165         length = -EFAULT;
 166         if (copy_from_user(page, buf, count))
 167                 goto out;
 168
 169         length = -EINVAL;
 170         if (sscanf(page, "%d", &new_value) != 1)
 171                 goto out;
 172
 173         if (new_value != selinux_enforcing) {
 174                 length = task_has_security(current, SECURITY__SETENFORCE);
 175                 if (length)
 176                         goto out;
 177                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 178                         "enforcing=%d old_enforcing=%d auid=%u ses=%u",
 179                         new_value, selinux_enforcing,
 180                         audit_get_loginuid(current),
 181                         audit_get_sessionid(current));
 182                 selinux_enforcing = new_value;
 183                 if (selinux_enforcing)
 184                         avc_ss_reset(0);
 185                 selnl_notify_setenforce(selinux_enforcing);
 186         }
 187         length = count;
 188 out:
 189         free_page((unsigned long) page);
 190         return length;
 191 }
 192 #else
 193 #define sel_write_enforce NULL
 194 #endif
 195
 196 static const struct file_operations sel_enforce_ops = {
 197         .read           = sel_read_enforce,
 198         .write          = sel_write_enforce,
 199 };
 200
 201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 202                                         size_t count, loff_t *ppos)
 203 {
 204         char tmpbuf[TMPBUFLEN];
 205         ssize_t length;
 206         ino_t ino = filp->f_path.dentry->d_inode->i_ino;
 207         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 208                 security_get_reject_unknown() : !security_get_allow_unknown();
 209
 210         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 211         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 212 }
 213
 214 static const struct file_operations sel_handle_unknown_ops = {
 215         .read           = sel_read_handle_unknown,
 216 };
 217
 218 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 219 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
 220                                  size_t count, loff_t *ppos)
 221
 222 {
 223         char *page;
 224         ssize_t length;
 225         int new_value;
 226         extern int selinux_disable(void);
 227
 228         if (count >= PAGE_SIZE)
 229                 return -ENOMEM;
 230         if (*ppos != 0) {
 231                 /* No partial writes. */
 232                 return -EINVAL;
 233         }
 234         page = (char *)get_zeroed_page(GFP_KERNEL);
 235         if (!page)
 236                 return -ENOMEM;
 237         length = -EFAULT;
 238         if (copy_from_user(page, buf, count))
 239                 goto out;
 240
 241         length = -EINVAL;
 242         if (sscanf(page, "%d", &new_value) != 1)
 243                 goto out;
 244
 245         if (new_value) {
 246                 length = selinux_disable();
 247                 if (length < 0)
 248                         goto out;
 249                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 250                         "selinux=0 auid=%u ses=%u",
 251                         audit_get_loginuid(current),
 252                         audit_get_sessionid(current));
 253         }
 254
 255         length = count;
 256 out:
 257         free_page((unsigned long) page);
 258         return length;
 259 }
 260 #else
 261 #define sel_write_disable NULL
 262 #endif
 263
 264 static const struct file_operations sel_disable_ops = {
 265         .write          = sel_write_disable,
 266 };
 267
 268 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 269                                    size_t count, loff_t *ppos)
 270 {
 271         char tmpbuf[TMPBUFLEN];
 272         ssize_t length;
 273
 274         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 275         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 276 }
 277
 278 static const struct file_operations sel_policyvers_ops = {
 279         .read           = sel_read_policyvers,
 280 };
 281
 282 /* declaration for sel_write_load */
 283 static int sel_make_bools(void);
 284 static int sel_make_classes(void);
 285 static int sel_make_policycap(void);
 286
 287 /* declaration for sel_make_class_dirs */
 288 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
 289                         unsigned long *ino);
 290
 291 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 292                                 size_t count, loff_t *ppos)
 293 {
 294         char tmpbuf[TMPBUFLEN];
 295         ssize_t length;
 296
 297         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
 298         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 299 }
 300
 301 static const struct file_operations sel_mls_ops = {
 302         .read           = sel_read_mls,
 303 };
 304
 305 static ssize_t sel_write_load(struct file *file, const char __user *buf,
 306                               size_t count, loff_t *ppos)
 307
 308 {
 309         int ret;
 310         ssize_t length;
 311         void *data = NULL;
 312
 313         mutex_lock(&sel_mutex);
 314
 315         length = task_has_security(current, SECURITY__LOAD_POLICY);
 316         if (length)
 317                 goto out;
 318
 319         if (*ppos != 0) {
 320                 /* No partial writes. */
 321                 length = -EINVAL;
 322                 goto out;
 323         }
 324
 325         if ((count > 64 * 1024 * 1024)
 326             || (data = vmalloc(count)) == NULL) {
 327                 length = -ENOMEM;
 328                 goto out;
 329         }
 330
 331         length = -EFAULT;
 332         if (copy_from_user(data, buf, count) != 0)
 333                 goto out;
 334
 335         length = security_load_policy(data, count);
 336         if (length)
 337                 goto out;
 338
 339         ret = sel_make_bools();
 340         if (ret) {
 341                 length = ret;
 342                 goto out1;
 343         }
 344
 345         ret = sel_make_classes();
 346         if (ret) {
 347                 length = ret;
 348                 goto out1;
 349         }
 350
 351         ret = sel_make_policycap();
 352         if (ret)
 353                 length = ret;
 354         else
 355                 length = count;
 356
 357 out1:
 358         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 359                 "policy loaded auid=%u ses=%u",
 360                 audit_get_loginuid(current),
 361                 audit_get_sessionid(current));
 362 out:
 363         mutex_unlock(&sel_mutex);
 364         vfree(data);
 365         return length;
 366 }
 367
 368 static const struct file_operations sel_load_ops = {
 369         .write          = sel_write_load,
 370 };
 371
 372 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
 373 {
 374         char *canon;
 375         u32 sid, len;
 376         ssize_t length;
 377
 378         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 379         if (length)
 380                 return length;
 381
 382         length = security_context_to_sid(buf, size, &sid);
 383         if (length < 0)
 384                 return length;
 385
 386         length = security_sid_to_context(sid, &canon, &len);
 387         if (length < 0)
 388                 return length;
 389
 390         if (len > SIMPLE_TRANSACTION_LIMIT) {
 391                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 392                         "payload max\n", __func__, len);
 393                 length = -ERANGE;
 394                 goto out;
 395         }
 396
 397         memcpy(buf, canon, len);
 398         length = len;
 399 out:
 400         kfree(canon);
 401         return length;
 402 }
 403
 404 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 405                                      size_t count, loff_t *ppos)
 406 {
 407         char tmpbuf[TMPBUFLEN];
 408         ssize_t length;
 409
 410         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 411         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 412 }
 413
 414 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
 415                                       size_t count, loff_t *ppos)
 416 {
 417         char *page;
 418         ssize_t length;
 419         unsigned int new_value;
 420
 421         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 422         if (length)
 423                 return length;
 424
 425         if (count >= PAGE_SIZE)
 426                 return -ENOMEM;
 427         if (*ppos != 0) {
 428                 /* No partial writes. */
 429                 return -EINVAL;
 430         }
 431         page = (char *)get_zeroed_page(GFP_KERNEL);
 432         if (!page)
 433                 return -ENOMEM;
 434         length = -EFAULT;
 435         if (copy_from_user(page, buf, count))
 436                 goto out;
 437
 438         length = -EINVAL;
 439         if (sscanf(page, "%u", &new_value) != 1)
 440                 goto out;
 441
 442         selinux_checkreqprot = new_value ? 1 : 0;
 443         length = count;
 444 out:
 445         free_page((unsigned long) page);
 446         return length;
 447 }
 448 static const struct file_operations sel_checkreqprot_ops = {
 449         .read           = sel_read_checkreqprot,
 450         .write          = sel_write_checkreqprot,
 451 };
 452
 453 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
 454                                    size_t count, loff_t *ppos)
 455 {
 456         char tmpbuf[TMPBUFLEN];
 457         ssize_t length;
 458
 459         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
 460         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 461 }
 462
 463 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
 464                                     size_t count, loff_t *ppos)
 465 {
 466         char *page;
 467         ssize_t length;
 468         int new_value;
 469
 470         length = task_has_security(current, SECURITY__LOAD_POLICY);
 471         if (length)
 472                 return length;
 473
 474         if (count >= PAGE_SIZE)
 475                 return -ENOMEM;
 476         if (*ppos != 0) {
 477                 /* No partial writes. */
 478                 return -EINVAL;
 479         }
 480         page = (char *)get_zeroed_page(GFP_KERNEL);
 481         if (!page)
 482                 return -ENOMEM;
 483         length = -EFAULT;
 484         if (copy_from_user(page, buf, count))
 485                 goto out;
 486
 487         length = -EINVAL;
 488         if (sscanf(page, "%d", &new_value) != 1)
 489                 goto out;
 490
 491         if (new_value) {
 492                 printk(KERN_NOTICE
 493                        "SELinux: compat_net is deprecated, please use secmark"
 494                        " instead\n");
 495                 selinux_compat_net = 1;
 496         } else
 497                 selinux_compat_net = 0;
 498         length = count;
 499 out:
 500         free_page((unsigned long) page);
 501         return length;
 502 }
 503 static const struct file_operations sel_compat_net_ops = {
 504         .read           = sel_read_compat_net,
 505         .write          = sel_write_compat_net,
 506 };
 507
 508 /*
 509  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 510  */
 511 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
 512 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
 513 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
 514 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
 515 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
 516
 517 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 518         [SEL_ACCESS] = sel_write_access,
 519         [SEL_CREATE] = sel_write_create,
 520         [SEL_RELABEL] = sel_write_relabel,
 521         [SEL_USER] = sel_write_user,
 522         [SEL_MEMBER] = sel_write_member,
 523         [SEL_CONTEXT] = sel_write_context,
 524 };
 525
 526 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 527 {
 528         ino_t ino = file->f_path.dentry->d_inode->i_ino;
 529         char *data;
 530         ssize_t rv;
 531
 532         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 533                 return -EINVAL;
 534
 535         data = simple_transaction_get(file, buf, size);
 536         if (IS_ERR(data))
 537                 return PTR_ERR(data);
 538
 539         rv = write_op[ino](file, data, size);
 540         if (rv > 0) {
 541                 simple_transaction_set(file, rv);
 542                 rv = size;
 543         }
 544         return rv;
 545 }
 546
 547 static const struct file_operations transaction_ops = {
 548         .write          = selinux_transaction_write,
 549         .read           = simple_transaction_read,
 550         .release        = simple_transaction_release,
 551 };
 552
 553 /*
 554  * payload - write methods
 555  * If the method has a response, the response should be put in buf,
 556  * and the length returned.  Otherwise return 0 or and -error.
 557  */
 558
 559 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
 560 {
 561         char *scon, *tcon;
 562         u32 ssid, tsid;
 563         u16 tclass;
 564         u32 req;
 565         struct av_decision avd;
 566         ssize_t length;
 567
 568         length = task_has_security(current, SECURITY__COMPUTE_AV);
 569         if (length)
 570                 return length;
 571
 572         length = -ENOMEM;
 573         scon = kzalloc(size+1, GFP_KERNEL);
 574         if (!scon)
 575                 return length;
 576
 577         tcon = kzalloc(size+1, GFP_KERNEL);
 578         if (!tcon)
 579                 goto out;
 580
 581         length = -EINVAL;
 582         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
 583                 goto out2;
 584
 585         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 586         if (length < 0)
 587                 goto out2;
 588         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 589         if (length < 0)
 590                 goto out2;
 591
 592         length = security_compute_av(ssid, tsid, tclass, req, &avd);
 593         if (length < 0)
 594                 goto out2;
 595
 596         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 597                           "%x %x %x %x %u",
 598                           avd.allowed, avd.decided,
 599                           avd.auditallow, avd.auditdeny,
 600                           avd.seqno);
 601 out2:
 602         kfree(tcon);
 603 out:
 604         kfree(scon);
 605         return length;
 606 }
 607
 608 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
 609 {
 610         char *scon, *tcon;
 611         u32 ssid, tsid, newsid;
 612         u16 tclass;
 613         ssize_t length;
 614         char *newcon;
 615         u32 len;
 616
 617         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 618         if (length)
 619                 return length;
 620
 621         length = -ENOMEM;
 622         scon = kzalloc(size+1, GFP_KERNEL);
 623         if (!scon)
 624                 return length;
 625
 626         tcon = kzalloc(size+1, GFP_KERNEL);
 627         if (!tcon)
 628                 goto out;
 629
 630         length = -EINVAL;
 631         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 632                 goto out2;
 633
 634         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 635         if (length < 0)
 636                 goto out2;
 637         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 638         if (length < 0)
 639                 goto out2;
 640
 641         length = security_transition_sid(ssid, tsid, tclass, &newsid);
 642         if (length < 0)
 643                 goto out2;
 644
 645         length = security_sid_to_context(newsid, &newcon, &len);
 646         if (length < 0)
 647                 goto out2;
 648
 649         if (len > SIMPLE_TRANSACTION_LIMIT) {
 650                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 651                         "payload max\n", __func__, len);
 652                 length = -ERANGE;
 653                 goto out3;
 654         }
 655
 656         memcpy(buf, newcon, len);
 657         length = len;
 658 out3:
 659         kfree(newcon);
 660 out2:
 661         kfree(tcon);
 662 out:
 663         kfree(scon);
 664         return length;
 665 }
 666
 667 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
 668 {
 669         char *scon, *tcon;
 670         u32 ssid, tsid, newsid;
 671         u16 tclass;
 672         ssize_t length;
 673         char *newcon;
 674         u32 len;
 675
 676         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 677         if (length)
 678                 return length;
 679
 680         length = -ENOMEM;
 681         scon = kzalloc(size+1, GFP_KERNEL);
 682         if (!scon)
 683                 return length;
 684
 685         tcon = kzalloc(size+1, GFP_KERNEL);
 686         if (!tcon)
 687                 goto out;
 688
 689         length = -EINVAL;
 690         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 691                 goto out2;
 692
 693         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 694         if (length < 0)
 695                 goto out2;
 696         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 697         if (length < 0)
 698                 goto out2;
 699
 700         length = security_change_sid(ssid, tsid, tclass, &newsid);
 701         if (length < 0)
 702                 goto out2;
 703
 704         length = security_sid_to_context(newsid, &newcon, &len);
 705         if (length < 0)
 706                 goto out2;
 707
 708         if (len > SIMPLE_TRANSACTION_LIMIT) {
 709                 length = -ERANGE;
 710                 goto out3;
 711         }
 712
 713         memcpy(buf, newcon, len);
 714         length = len;
 715 out3:
 716         kfree(newcon);
 717 out2:
 718         kfree(tcon);
 719 out:
 720         kfree(scon);
 721         return length;
 722 }
 723
 724 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
 725 {
 726         char *con, *user, *ptr;
 727         u32 sid, *sids;
 728         ssize_t length;
 729         char *newcon;
 730         int i, rc;
 731         u32 len, nsids;
 732
 733         length = task_has_security(current, SECURITY__COMPUTE_USER);
 734         if (length)
 735                 return length;
 736
 737         length = -ENOMEM;
 738         con = kzalloc(size+1, GFP_KERNEL);
 739         if (!con)
 740                 return length;
 741
 742         user = kzalloc(size+1, GFP_KERNEL);
 743         if (!user)
 744                 goto out;
 745
 746         length = -EINVAL;
 747         if (sscanf(buf, "%s %s", con, user) != 2)
 748                 goto out2;
 749
 750         length = security_context_to_sid(con, strlen(con)+1, &sid);
 751         if (length < 0)
 752                 goto out2;
 753
 754         length = security_get_user_sids(sid, user, &sids, &nsids);
 755         if (length < 0)
 756                 goto out2;
 757
 758         length = sprintf(buf, "%u", nsids) + 1;
 759         ptr = buf + length;
 760         for (i = 0; i < nsids; i++) {
 761                 rc = security_sid_to_context(sids[i], &newcon, &len);
 762                 if (rc) {
 763                         length = rc;
 764                         goto out3;
 765                 }
 766                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 767                         kfree(newcon);
 768                         length = -ERANGE;
 769                         goto out3;
 770                 }
 771                 memcpy(ptr, newcon, len);
 772                 kfree(newcon);
 773                 ptr += len;
 774                 length += len;
 775         }
 776 out3:
 777         kfree(sids);
 778 out2:
 779         kfree(user);
 780 out:
 781         kfree(con);
 782         return length;
 783 }
 784
 785 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
 786 {
 787         char *scon, *tcon;
 788         u32 ssid, tsid, newsid;
 789         u16 tclass;
 790         ssize_t length;
 791         char *newcon;
 792         u32 len;
 793
 794         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 795         if (length)
 796                 return length;
 797
 798         length = -ENOMEM;
 799         scon = kzalloc(size+1, GFP_KERNEL);
 800         if (!scon)
 801                 return length;
 802
 803         tcon = kzalloc(size+1, GFP_KERNEL);
 804         if (!tcon)
 805                 goto out;
 806
 807         length = -EINVAL;
 808         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 809                 goto out2;
 810
 811         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 812         if (length < 0)
 813                 goto out2;
 814         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 815         if (length < 0)
 816                 goto out2;
 817
 818         length = security_member_sid(ssid, tsid, tclass, &newsid);
 819         if (length < 0)
 820                 goto out2;
 821
 822         length = security_sid_to_context(newsid, &newcon, &len);
 823         if (length < 0)
 824                 goto out2;
 825
 826         if (len > SIMPLE_TRANSACTION_LIMIT) {
 827                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
 828                         "payload max\n", __func__, len);
 829                 length = -ERANGE;
 830                 goto out3;
 831         }
 832
 833         memcpy(buf, newcon, len);
 834         length = len;
 835 out3:
 836         kfree(newcon);
 837 out2:
 838         kfree(tcon);
 839 out:
 840         kfree(scon);
 841         return length;
 842 }
 843
 844 static struct inode *sel_make_inode(struct super_block *sb, int mode)
 845 {
 846         struct inode *ret = new_inode(sb);
 847
 848         if (ret) {
 849                 ret->i_mode = mode;
 850                 ret->i_uid = ret->i_gid = 0;
 851                 ret->i_blocks = 0;
 852                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
 853         }
 854         return ret;
 855 }
 856
 857 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 858                              size_t count, loff_t *ppos)
 859 {
 860         char *page = NULL;
 861         ssize_t length;
 862         ssize_t ret;
 863         int cur_enforcing;
 864         struct inode *inode = filep->f_path.dentry->d_inode;
 865         unsigned index = inode->i_ino & SEL_INO_MASK;
 866         const char *name = filep->f_path.dentry->d_name.name;
 867
 868         mutex_lock(&sel_mutex);
 869
 870         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
 871                 ret = -EINVAL;
 872                 goto out;
 873         }
 874
 875         if (count > PAGE_SIZE) {
 876                 ret = -EINVAL;
 877                 goto out;
 878         }
 879         page = (char *)get_zeroed_page(GFP_KERNEL);
 880         if (!page) {
 881                 ret = -ENOMEM;
 882                 goto out;
 883         }
 884
 885         cur_enforcing = security_get_bool_value(index);
 886         if (cur_enforcing < 0) {
 887                 ret = cur_enforcing;
 888                 goto out;
 889         }
 890         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
 891                           bool_pending_values[index]);
 892         ret = simple_read_from_buffer(buf, count, ppos, page, length);
 893 out:
 894         mutex_unlock(&sel_mutex);
 895         if (page)
 896                 free_page((unsigned long)page);
 897         return ret;
 898 }
 899
 900 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
 901                               size_t count, loff_t *ppos)
 902 {
 903         char *page = NULL;
 904         ssize_t length;
 905         int new_value;
 906         struct inode *inode = filep->f_path.dentry->d_inode;
 907         unsigned index = inode->i_ino & SEL_INO_MASK;
 908         const char *name = filep->f_path.dentry->d_name.name;
 909
 910         mutex_lock(&sel_mutex);
 911
 912         length = task_has_security(current, SECURITY__SETBOOL);
 913         if (length)
 914                 goto out;
 915
 916         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
 917                 length = -EINVAL;
 918                 goto out;
 919         }
 920
 921         if (count >= PAGE_SIZE) {
 922                 length = -ENOMEM;
 923                 goto out;
 924         }
 925
 926         if (*ppos != 0) {
 927                 /* No partial writes. */
 928                 length = -EINVAL;
 929                 goto out;
 930         }
 931         page = (char *)get_zeroed_page(GFP_KERNEL);
 932         if (!page) {
 933                 length = -ENOMEM;
 934                 goto out;
 935         }
 936
 937         length = -EFAULT;
 938         if (copy_from_user(page, buf, count))
 939                 goto out;
 940
 941         length = -EINVAL;
 942         if (sscanf(page, "%d", &new_value) != 1)
 943                 goto out;
 944
 945         if (new_value)
 946                 new_value = 1;
 947
 948         bool_pending_values[index] = new_value;
 949         length = count;
 950
 951 out:
 952         mutex_unlock(&sel_mutex);
 953         if (page)
 954                 free_page((unsigned long) page);
 955         return length;
 956 }
 957
 958 static const struct file_operations sel_bool_ops = {
 959         .read           = sel_read_bool,
 960         .write          = sel_write_bool,
 961 };
 962
 963 static ssize_t sel_commit_bools_write(struct file *filep,
 964                                       const char __user *buf,
 965                                       size_t count, loff_t *ppos)
 966 {
 967         char *page = NULL;
 968         ssize_t length;
 969         int new_value;
 970
 971         mutex_lock(&sel_mutex);
 972
 973         length = task_has_security(current, SECURITY__SETBOOL);
 974         if (length)
 975                 goto out;
 976
 977         if (count >= PAGE_SIZE) {
 978                 length = -ENOMEM;
 979                 goto out;
 980         }
 981         if (*ppos != 0) {
 982                 /* No partial writes. */
 983                 goto out;
 984         }
 985         page = (char *)get_zeroed_page(GFP_KERNEL);
 986         if (!page) {
 987                 length = -ENOMEM;
 988                 goto out;
 989         }
 990
 991         length = -EFAULT;
 992         if (copy_from_user(page, buf, count))
 993                 goto out;
 994
 995         length = -EINVAL;
 996         if (sscanf(page, "%d", &new_value) != 1)
 997                 goto out;
 998
 999         if (new_value && bool_pending_values)
1000                 security_set_bools(bool_num, bool_pending_values);
1001
1002         length = count;
1003
1004 out:
1005         mutex_unlock(&sel_mutex);
1006         if (page)
1007                 free_page((unsigned long) page);
1008         return length;
1009 }
1010
1011 static const struct file_operations sel_commit_bools_ops = {
1012         .write          = sel_commit_bools_write,
1013 };
1014
1015 static void sel_remove_entries(struct dentry *de)
1016 {
1017         struct list_head *node;
1018
1019         spin_lock(&dcache_lock);
1020         node = de->d_subdirs.next;
1021         while (node != &de->d_subdirs) {
1022                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1023                 list_del_init(node);
1024
1025                 if (d->d_inode) {
1026                         d = dget_locked(d);
1027                         spin_unlock(&dcache_lock);
1028                         d_delete(d);
1029                         simple_unlink(de->d_inode, d);
1030                         dput(d);
1031                         spin_lock(&dcache_lock);
1032                 }
1033                 node = de->d_subdirs.next;
1034         }
1035
1036         spin_unlock(&dcache_lock);
1037 }
1038
1039 #define BOOL_DIR_NAME "booleans"
1040
1041 static int sel_make_bools(void)
1042 {
1043         int i, ret = 0;
1044         ssize_t len;
1045         struct dentry *dentry = NULL;
1046         struct dentry *dir = bool_dir;
1047         struct inode *inode = NULL;
1048         struct inode_security_struct *isec;
1049         char **names = NULL, *page;
1050         int num;
1051         int *values = NULL;
1052         u32 sid;
1053
1054         /* remove any existing files */
1055         kfree(bool_pending_names);
1056         kfree(bool_pending_values);
1057         bool_pending_names = NULL;
1058         bool_pending_values = NULL;
1059
1060         sel_remove_entries(dir);
1061
1062         page = (char *)get_zeroed_page(GFP_KERNEL);
1063         if (!page)
1064                 return -ENOMEM;
1065
1066         ret = security_get_bools(&num, &names, &values);
1067         if (ret != 0)
1068                 goto out;
1069
1070         for (i = 0; i < num; i++) {
1071                 dentry = d_alloc_name(dir, names[i]);
1072                 if (!dentry) {
1073                         ret = -ENOMEM;
1074                         goto err;
1075                 }
1076                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1077                 if (!inode) {
1078                         ret = -ENOMEM;
1079                         goto err;
1080                 }
1081
1082                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1083                 if (len < 0) {
1084                         ret = -EINVAL;
1085                         goto err;
1086                 } else if (len >= PAGE_SIZE) {
1087                         ret = -ENAMETOOLONG;
1088                         goto err;
1089                 }
1090                 isec = (struct inode_security_struct *)inode->i_security;
1091                 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1092                 if (ret)
1093                         goto err;
1094                 isec->sid = sid;
1095                 isec->initialized = 1;
1096                 inode->i_fop = &sel_bool_ops;
1097                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1098                 d_add(dentry, inode);
1099         }
1100         bool_num = num;
1101         bool_pending_names = names;
1102         bool_pending_values = values;
1103 out:
1104         free_page((unsigned long)page);
1105         return ret;
1106 err:
1107         if (names) {
1108                 for (i = 0; i < num; i++)
1109                         kfree(names[i]);
1110                 kfree(names);
1111         }
1112         kfree(values);
1113         sel_remove_entries(dir);
1114         ret = -ENOMEM;
1115         goto out;
1116 }
1117
1118 #define NULL_FILE_NAME "null"
1119
1120 struct dentry *selinux_null;
1121
1122 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1123                                             size_t count, loff_t *ppos)
1124 {
1125         char tmpbuf[TMPBUFLEN];
1126         ssize_t length;
1127
1128         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1129         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1130 }
1131
1132 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1133                                              const char __user *buf,
1134                                              size_t count, loff_t *ppos)
1135
1136 {
1137         char *page;
1138         ssize_t ret;
1139         int new_value;
1140
1141         if (count >= PAGE_SIZE) {
1142                 ret = -ENOMEM;
1143                 goto out;
1144         }
1145
1146         if (*ppos != 0) {
1147                 /* No partial writes. */
1148                 ret = -EINVAL;
1149                 goto out;
1150         }
1151
1152         page = (char *)get_zeroed_page(GFP_KERNEL);
1153         if (!page) {
1154                 ret = -ENOMEM;
1155                 goto out;
1156         }
1157
1158         if (copy_from_user(page, buf, count)) {
1159                 ret = -EFAULT;
1160                 goto out_free;
1161         }
1162
1163         if (sscanf(page, "%u", &new_value) != 1) {
1164                 ret = -EINVAL;
1165                 goto out;
1166         }
1167
1168         if (new_value != avc_cache_threshold) {
1169                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1170                 if (ret)
1171                         goto out_free;
1172                 avc_cache_threshold = new_value;
1173         }
1174         ret = count;
1175 out_free:
1176         free_page((unsigned long)page);
1177 out:
1178         return ret;
1179 }
1180
1181 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1182                                        size_t count, loff_t *ppos)
1183 {
1184         char *page;
1185         ssize_t ret = 0;
1186
1187         page = (char *)__get_free_page(GFP_KERNEL);
1188         if (!page) {
1189                 ret = -ENOMEM;
1190                 goto out;
1191         }
1192         ret = avc_get_hash_stats(page);
1193         if (ret >= 0)
1194                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1195         free_page((unsigned long)page);
1196 out:
1197         return ret;
1198 }
1199
1200 static const struct file_operations sel_avc_cache_threshold_ops = {
1201         .read           = sel_read_avc_cache_threshold,
1202         .write          = sel_write_avc_cache_threshold,
1203 };
1204
1205 static const struct file_operations sel_avc_hash_stats_ops = {
1206         .read           = sel_read_avc_hash_stats,
1207 };
1208
1209 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1210 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1211 {
1212         int cpu;
1213
1214         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1215                 if (!cpu_possible(cpu))
1216                         continue;
1217                 *idx = cpu + 1;
1218                 return &per_cpu(avc_cache_stats, cpu);
1219         }
1220         return NULL;
1221 }
1222
1223 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1224 {
1225         loff_t n = *pos - 1;
1226
1227         if (*pos == 0)
1228                 return SEQ_START_TOKEN;
1229
1230         return sel_avc_get_stat_idx(&n);
1231 }
1232
1233 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1234 {
1235         return sel_avc_get_stat_idx(pos);
1236 }
1237
1238 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1239 {
1240         struct avc_cache_stats *st = v;
1241
1242         if (v == SEQ_START_TOKEN)
1243                 seq_printf(seq, "lookups hits misses allocations reclaims "
1244                            "frees\n");
1245         else
1246                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1247                            st->hits, st->misses, st->allocations,
1248                            st->reclaims, st->frees);
1249         return 0;
1250 }
1251
1252 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1253 { }
1254
1255 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1256         .start          = sel_avc_stats_seq_start,
1257         .next           = sel_avc_stats_seq_next,
1258         .show           = sel_avc_stats_seq_show,
1259         .stop           = sel_avc_stats_seq_stop,
1260 };
1261
1262 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1263 {
1264         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1265 }
1266
1267 static const struct file_operations sel_avc_cache_stats_ops = {
1268         .open           = sel_open_avc_cache_stats,
1269         .read           = seq_read,
1270         .llseek         = seq_lseek,
1271         .release        = seq_release,
1272 };
1273 #endif
1274
1275 static int sel_make_avc_files(struct dentry *dir)
1276 {
1277         int i, ret = 0;
1278         static struct tree_descr files[] = {
1279                 { "cache_threshold",
1280                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1281                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1282 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1283                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1284 #endif
1285         };
1286
1287         for (i = 0; i < ARRAY_SIZE(files); i++) {
1288                 struct inode *inode;
1289                 struct dentry *dentry;
1290
1291                 dentry = d_alloc_name(dir, files[i].name);
1292                 if (!dentry) {
1293                         ret = -ENOMEM;
1294                         goto out;
1295                 }
1296
1297                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1298                 if (!inode) {
1299                         ret = -ENOMEM;
1300                         goto out;
1301                 }
1302                 inode->i_fop = files[i].ops;
1303                 inode->i_ino = ++sel_last_ino;
1304                 d_add(dentry, inode);
1305         }
1306 out:
1307         return ret;
1308 }
1309
1310 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1311                                 size_t count, loff_t *ppos)
1312 {
1313         struct inode *inode;
1314         char *con;
1315         u32 sid, len;
1316         ssize_t ret;
1317
1318         inode = file->f_path.dentry->d_inode;
1319         sid = inode->i_ino&SEL_INO_MASK;
1320         ret = security_sid_to_context(sid, &con, &len);
1321         if (ret < 0)
1322                 return ret;
1323
1324         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1325         kfree(con);
1326         return ret;
1327 }
1328
1329 static const struct file_operations sel_initcon_ops = {
1330         .read           = sel_read_initcon,
1331 };
1332
1333 static int sel_make_initcon_files(struct dentry *dir)
1334 {
1335         int i, ret = 0;
1336
1337         for (i = 1; i <= SECINITSID_NUM; i++) {
1338                 struct inode *inode;
1339                 struct dentry *dentry;
1340                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1341                 if (!dentry) {
1342                         ret = -ENOMEM;
1343                         goto out;
1344                 }
1345
1346                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1347                 if (!inode) {
1348                         ret = -ENOMEM;
1349                         goto out;
1350                 }
1351                 inode->i_fop = &sel_initcon_ops;
1352                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1353                 d_add(dentry, inode);
1354         }
1355 out:
1356         return ret;
1357 }
1358
1359 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1360 {
1361         return a / b - (a % b < 0);
1362 }
1363
1364 static inline unsigned long sel_class_to_ino(u16 class)
1365 {
1366         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1367 }
1368
1369 static inline u16 sel_ino_to_class(unsigned long ino)
1370 {
1371         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1372 }
1373
1374 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1375 {
1376         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1377 }
1378
1379 static inline u32 sel_ino_to_perm(unsigned long ino)
1380 {
1381         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1382 }
1383
1384 static ssize_t sel_read_class(struct file *file, char __user *buf,
1385                                 size_t count, loff_t *ppos)
1386 {
1387         ssize_t rc, len;
1388         char *page;
1389         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1390
1391         page = (char *)__get_free_page(GFP_KERNEL);
1392         if (!page) {
1393                 rc = -ENOMEM;
1394                 goto out;
1395         }
1396
1397         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1398         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1399         free_page((unsigned long)page);
1400 out:
1401         return rc;
1402 }
1403
1404 static const struct file_operations sel_class_ops = {
1405         .read           = sel_read_class,
1406 };
1407
1408 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1409                                 size_t count, loff_t *ppos)
1410 {
1411         ssize_t rc, len;
1412         char *page;
1413         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1414
1415         page = (char *)__get_free_page(GFP_KERNEL);
1416         if (!page) {
1417                 rc = -ENOMEM;
1418                 goto out;
1419         }
1420
1421         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1422         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1423         free_page((unsigned long)page);
1424 out:
1425         return rc;
1426 }
1427
1428 static const struct file_operations sel_perm_ops = {
1429         .read           = sel_read_perm,
1430 };
1431
1432 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1433                                   size_t count, loff_t *ppos)
1434 {
1435         int value;
1436         char tmpbuf[TMPBUFLEN];
1437         ssize_t length;
1438         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1439
1440         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1441         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1442
1443         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1444 }
1445
1446 static const struct file_operations sel_policycap_ops = {
1447         .read           = sel_read_policycap,
1448 };
1449
1450 static int sel_make_perm_files(char *objclass, int classvalue,
1451                                 struct dentry *dir)
1452 {
1453         int i, rc = 0, nperms;
1454         char **perms;
1455
1456         rc = security_get_permissions(objclass, &perms, &nperms);
1457         if (rc)
1458                 goto out;
1459
1460         for (i = 0; i < nperms; i++) {
1461                 struct inode *inode;
1462                 struct dentry *dentry;
1463
1464                 dentry = d_alloc_name(dir, perms[i]);
1465                 if (!dentry) {
1466                         rc = -ENOMEM;
1467                         goto out1;
1468                 }
1469
1470                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1471                 if (!inode) {
1472                         rc = -ENOMEM;
1473                         goto out1;
1474                 }
1475                 inode->i_fop = &sel_perm_ops;
1476                 /* i+1 since perm values are 1-indexed */
1477                 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1478                 d_add(dentry, inode);
1479         }
1480
1481 out1:
1482         for (i = 0; i < nperms; i++)
1483                 kfree(perms[i]);
1484         kfree(perms);
1485 out:
1486         return rc;
1487 }
1488
1489 static int sel_make_class_dir_entries(char *classname, int index,
1490                                         struct dentry *dir)
1491 {
1492         struct dentry *dentry = NULL;
1493         struct inode *inode = NULL;
1494         int rc;
1495
1496         dentry = d_alloc_name(dir, "index");
1497         if (!dentry) {
1498                 rc = -ENOMEM;
1499                 goto out;
1500         }
1501
1502         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1503         if (!inode) {
1504                 rc = -ENOMEM;
1505                 goto out;
1506         }
1507
1508         inode->i_fop = &sel_class_ops;
1509         inode->i_ino = sel_class_to_ino(index);
1510         d_add(dentry, inode);
1511
1512         dentry = d_alloc_name(dir, "perms");
1513         if (!dentry) {
1514                 rc = -ENOMEM;
1515                 goto out;
1516         }
1517
1518         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1519         if (rc)
1520                 goto out;
1521
1522         rc = sel_make_perm_files(classname, index, dentry);
1523
1524 out:
1525         return rc;
1526 }
1527
1528 static void sel_remove_classes(void)
1529 {
1530         struct list_head *class_node;
1531
1532         list_for_each(class_node, &class_dir->d_subdirs) {
1533                 struct dentry *class_subdir = list_entry(class_node,
1534                                         struct dentry, d_u.d_child);
1535                 struct list_head *class_subdir_node;
1536
1537                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1538                         struct dentry *d = list_entry(class_subdir_node,
1539                                                 struct dentry, d_u.d_child);
1540
1541                         if (d->d_inode)
1542                                 if (d->d_inode->i_mode & S_IFDIR)
1543                                         sel_remove_entries(d);
1544                 }
1545
1546                 sel_remove_entries(class_subdir);
1547         }
1548
1549         sel_remove_entries(class_dir);
1550 }
1551
1552 static int sel_make_classes(void)
1553 {
1554         int rc = 0, nclasses, i;
1555         char **classes;
1556
1557         /* delete any existing entries */
1558         sel_remove_classes();
1559
1560         rc = security_get_classes(&classes, &nclasses);
1561         if (rc < 0)
1562                 goto out;
1563
1564         /* +2 since classes are 1-indexed */
1565         last_class_ino = sel_class_to_ino(nclasses+2);
1566
1567         for (i = 0; i < nclasses; i++) {
1568                 struct dentry *class_name_dir;
1569
1570                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1571                 if (!class_name_dir) {
1572                         rc = -ENOMEM;
1573                         goto out1;
1574                 }
1575
1576                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1577                                 &last_class_ino);
1578                 if (rc)
1579                         goto out1;
1580
1581                 /* i+1 since class values are 1-indexed */
1582                 rc = sel_make_class_dir_entries(classes[i], i+1,
1583                                 class_name_dir);
1584                 if (rc)
1585                         goto out1;
1586         }
1587
1588 out1:
1589         for (i = 0; i < nclasses; i++)
1590                 kfree(classes[i]);
1591         kfree(classes);
1592 out:
1593         return rc;
1594 }
1595
1596 static int sel_make_policycap(void)
1597 {
1598         unsigned int iter;
1599         struct dentry *dentry = NULL;
1600         struct inode *inode = NULL;
1601
1602         sel_remove_entries(policycap_dir);
1603
1604         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1605                 if (iter < ARRAY_SIZE(policycap_names))
1606                         dentry = d_alloc_name(policycap_dir,
1607                                               policycap_names[iter]);
1608                 else
1609                         dentry = d_alloc_name(policycap_dir, "unknown");
1610
1611                 if (dentry == NULL)
1612                         return -ENOMEM;
1613
1614                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1615                 if (inode == NULL)
1616                         return -ENOMEM;
1617
1618                 inode->i_fop = &sel_policycap_ops;
1619                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1620                 d_add(dentry, inode);
1621         }
1622
1623         return 0;
1624 }
1625
1626 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1627                         unsigned long *ino)
1628 {
1629         int ret = 0;
1630         struct inode *inode;
1631
1632         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1633         if (!inode) {
1634                 ret = -ENOMEM;
1635                 goto out;
1636         }
1637         inode->i_op = &simple_dir_inode_operations;
1638         inode->i_fop = &simple_dir_operations;
1639         inode->i_ino = ++(*ino);
1640         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1641         inc_nlink(inode);
1642         d_add(dentry, inode);
1643         /* bump link count on parent directory, too */
1644         inc_nlink(dir);
1645 out:
1646         return ret;
1647 }
1648
1649 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1650 {
1651         int ret;
1652         struct dentry *dentry;
1653         struct inode *inode, *root_inode;
1654         struct inode_security_struct *isec;
1655
1656         static struct tree_descr selinux_files[] = {
1657                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1658                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1659                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1660                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1661                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1662                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1663                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1664                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1665                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1666                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1667                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1668                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1669                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1670                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1671                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1672                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1673                 /* last one */ {""}
1674         };
1675         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1676         if (ret)
1677                 goto err;
1678
1679         root_inode = sb->s_root->d_inode;
1680
1681         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1682         if (!dentry) {
1683                 ret = -ENOMEM;
1684                 goto err;
1685         }
1686
1687         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1688         if (ret)
1689                 goto err;
1690
1691         bool_dir = dentry;
1692
1693         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1694         if (!dentry) {
1695                 ret = -ENOMEM;
1696                 goto err;
1697         }
1698
1699         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1700         if (!inode) {
1701                 ret = -ENOMEM;
1702                 goto err;
1703         }
1704         inode->i_ino = ++sel_last_ino;
1705         isec = (struct inode_security_struct *)inode->i_security;
1706         isec->sid = SECINITSID_DEVNULL;
1707         isec->sclass = SECCLASS_CHR_FILE;
1708         isec->initialized = 1;
1709
1710         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1711         d_add(dentry, inode);
1712         selinux_null = dentry;
1713
1714         dentry = d_alloc_name(sb->s_root, "avc");
1715         if (!dentry) {
1716                 ret = -ENOMEM;
1717                 goto err;
1718         }
1719
1720         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1721         if (ret)
1722                 goto err;
1723
1724         ret = sel_make_avc_files(dentry);
1725         if (ret)
1726                 goto err;
1727
1728         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1729         if (!dentry) {
1730                 ret = -ENOMEM;
1731                 goto err;
1732         }
1733
1734         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1735         if (ret)
1736                 goto err;
1737
1738         ret = sel_make_initcon_files(dentry);
1739         if (ret)
1740                 goto err;
1741
1742         dentry = d_alloc_name(sb->s_root, "class");
1743         if (!dentry) {
1744                 ret = -ENOMEM;
1745                 goto err;
1746         }
1747
1748         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1749         if (ret)
1750                 goto err;
1751
1752         class_dir = dentry;
1753
1754         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1755         if (!dentry) {
1756                 ret = -ENOMEM;
1757                 goto err;
1758         }
1759
1760         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1761         if (ret)
1762                 goto err;
1763
1764         policycap_dir = dentry;
1765
1766 out:
1767         return ret;
1768 err:
1769         printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1770                 __func__);
1771         goto out;
1772 }
1773
1774 static int sel_get_sb(struct file_system_type *fs_type,
1775                       int flags, const char *dev_name, void *data,
1776                       struct vfsmount *mnt)
1777 {
1778         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1779 }
1780
1781 static struct file_system_type sel_fs_type = {
1782         .name           = "selinuxfs",
1783         .get_sb         = sel_get_sb,
1784         .kill_sb        = kill_litter_super,
1785 };
1786
1787 struct vfsmount *selinuxfs_mount;
1788
1789 static int __init init_sel_fs(void)
1790 {
1791         int err;
1792
1793         if (!selinux_enabled)
1794                 return 0;
1795         err = register_filesystem(&sel_fs_type);
1796         if (!err) {
1797                 selinuxfs_mount = kern_mount(&sel_fs_type);
1798                 if (IS_ERR(selinuxfs_mount)) {
1799                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1800                         err = PTR_ERR(selinuxfs_mount);
1801                         selinuxfs_mount = NULL;
1802                 }
1803         }
1804         return err;
1805 }
1806
1807 __initcall(init_sel_fs);
1808
1809 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1810 void exit_sel_fs(void)
1811 {
1812         unregister_filesystem(&sel_fs_type);
1813 }
1814 #endif