SAFE public projects git trees. - safe/jmp/linux-2.6/blob - security/selinux/selinuxfs.c

   1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
   2  *
   3  *      Added conditional policy language extensions
   4  *
   5  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
   6  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation, version 2.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/slab.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/fs.h>
  17 #include <linux/mutex.h>
  18 #include <linux/init.h>
  19 #include <linux/string.h>
  20 #include <linux/security.h>
  21 #include <linux/major.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/percpu.h>
  24 #include <linux/audit.h>
  25 #include <asm/uaccess.h>
  26 #include <asm/semaphore.h>
  27
  28 /* selinuxfs pseudo filesystem for exporting the security policy API.
  29    Based on the proc code and the fs/nfsd/nfsctl.c code. */
  30
  31 #include "flask.h"
  32 #include "avc.h"
  33 #include "avc_ss.h"
  34 #include "security.h"
  35 #include "objsec.h"
  36 #include "conditional.h"
  37
  38 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
  39
  40 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
  41 #define SELINUX_COMPAT_NET_VALUE 0
  42 #else
  43 #define SELINUX_COMPAT_NET_VALUE 1
  44 #endif
  45
  46 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
  47
  48 static int __init checkreqprot_setup(char *str)
  49 {
  50         selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
  51         return 1;
  52 }
  53 __setup("checkreqprot=", checkreqprot_setup);
  54
  55 static int __init selinux_compat_net_setup(char *str)
  56 {
  57         selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
  58         return 1;
  59 }
  60 __setup("selinux_compat_net=", selinux_compat_net_setup);
  61
  62
  63 static DEFINE_MUTEX(sel_mutex);
  64
  65 /* global data for booleans */
  66 static struct dentry *bool_dir = NULL;
  67 static int bool_num = 0;
  68 static int *bool_pending_values = NULL;
  69
  70 /* global data for classes */
  71 static struct dentry *class_dir = NULL;
  72 static unsigned long last_class_ino;
  73
  74 extern void selnl_notify_setenforce(int val);
  75
  76 /* Check whether a task is allowed to use a security operation. */
  77 static int task_has_security(struct task_struct *tsk,
  78                              u32 perms)
  79 {
  80         struct task_security_struct *tsec;
  81
  82         tsec = tsk->security;
  83         if (!tsec)
  84                 return -EACCES;
  85
  86         return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
  87                             SECCLASS_SECURITY, perms, NULL);
  88 }
  89
  90 enum sel_inos {
  91         SEL_ROOT_INO = 2,
  92         SEL_LOAD,       /* load policy */
  93         SEL_ENFORCE,    /* get or set enforcing status */
  94         SEL_CONTEXT,    /* validate context */
  95         SEL_ACCESS,     /* compute access decision */
  96         SEL_CREATE,     /* compute create labeling decision */
  97         SEL_RELABEL,    /* compute relabeling decision */
  98         SEL_USER,       /* compute reachable user contexts */
  99         SEL_POLICYVERS, /* return policy version for this kernel */
 100         SEL_COMMIT_BOOLS, /* commit new boolean values */
 101         SEL_MLS,        /* return if MLS policy is enabled */
 102         SEL_DISABLE,    /* disable SELinux until next reboot */
 103         SEL_MEMBER,     /* compute polyinstantiation membership decision */
 104         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
 105         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
 106         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
 107         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
 108         SEL_INO_NEXT,   /* The next inode number to use */
 109 };
 110
 111 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
 112
 113 #define SEL_INITCON_INO_OFFSET  0x01000000
 114 #define SEL_BOOL_INO_OFFSET     0x02000000
 115 #define SEL_CLASS_INO_OFFSET    0x04000000
 116 #define SEL_INO_MASK            0x00ffffff
 117
 118 #define TMPBUFLEN       12
 119 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 120                                 size_t count, loff_t *ppos)
 121 {
 122         char tmpbuf[TMPBUFLEN];
 123         ssize_t length;
 124
 125         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
 126         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 127 }
 128
 129 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
 130 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
 131                                  size_t count, loff_t *ppos)
 132
 133 {
 134         char *page;
 135         ssize_t length;
 136         int new_value;
 137
 138         if (count >= PAGE_SIZE)
 139                 return -ENOMEM;
 140         if (*ppos != 0) {
 141                 /* No partial writes. */
 142                 return -EINVAL;
 143         }
 144         page = (char*)get_zeroed_page(GFP_KERNEL);
 145         if (!page)
 146                 return -ENOMEM;
 147         length = -EFAULT;
 148         if (copy_from_user(page, buf, count))
 149                 goto out;
 150
 151         length = -EINVAL;
 152         if (sscanf(page, "%d", &new_value) != 1)
 153                 goto out;
 154
 155         if (new_value != selinux_enforcing) {
 156                 length = task_has_security(current, SECURITY__SETENFORCE);
 157                 if (length)
 158                         goto out;
 159                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 160                         "enforcing=%d old_enforcing=%d auid=%u", new_value,
 161                         selinux_enforcing,
 162                         audit_get_loginuid(current->audit_context));
 163                 selinux_enforcing = new_value;
 164                 if (selinux_enforcing)
 165                         avc_ss_reset(0);
 166                 selnl_notify_setenforce(selinux_enforcing);
 167         }
 168         length = count;
 169 out:
 170         free_page((unsigned long) page);
 171         return length;
 172 }
 173 #else
 174 #define sel_write_enforce NULL
 175 #endif
 176
 177 static const struct file_operations sel_enforce_ops = {
 178         .read           = sel_read_enforce,
 179         .write          = sel_write_enforce,
 180 };
 181
 182 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
 183                                         size_t count, loff_t *ppos)
 184 {
 185         char tmpbuf[TMPBUFLEN];
 186         ssize_t length;
 187         ino_t ino = filp->f_path.dentry->d_inode->i_ino;
 188         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
 189                 security_get_reject_unknown() : !security_get_allow_unknown();
 190
 191         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
 192         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 193 }
 194
 195 static const struct file_operations sel_handle_unknown_ops = {
 196         .read           = sel_read_handle_unknown,
 197 };
 198
 199 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
 200 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
 201                                  size_t count, loff_t *ppos)
 202
 203 {
 204         char *page;
 205         ssize_t length;
 206         int new_value;
 207         extern int selinux_disable(void);
 208
 209         if (count >= PAGE_SIZE)
 210                 return -ENOMEM;
 211         if (*ppos != 0) {
 212                 /* No partial writes. */
 213                 return -EINVAL;
 214         }
 215         page = (char*)get_zeroed_page(GFP_KERNEL);
 216         if (!page)
 217                 return -ENOMEM;
 218         length = -EFAULT;
 219         if (copy_from_user(page, buf, count))
 220                 goto out;
 221
 222         length = -EINVAL;
 223         if (sscanf(page, "%d", &new_value) != 1)
 224                 goto out;
 225
 226         if (new_value) {
 227                 length = selinux_disable();
 228                 if (length < 0)
 229                         goto out;
 230                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
 231                         "selinux=0 auid=%u",
 232                         audit_get_loginuid(current->audit_context));
 233         }
 234
 235         length = count;
 236 out:
 237         free_page((unsigned long) page);
 238         return length;
 239 }
 240 #else
 241 #define sel_write_disable NULL
 242 #endif
 243
 244 static const struct file_operations sel_disable_ops = {
 245         .write          = sel_write_disable,
 246 };
 247
 248 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
 249                                    size_t count, loff_t *ppos)
 250 {
 251         char tmpbuf[TMPBUFLEN];
 252         ssize_t length;
 253
 254         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
 255         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 256 }
 257
 258 static const struct file_operations sel_policyvers_ops = {
 259         .read           = sel_read_policyvers,
 260 };
 261
 262 /* declaration for sel_write_load */
 263 static int sel_make_bools(void);
 264 static int sel_make_classes(void);
 265
 266 /* declaration for sel_make_class_dirs */
 267 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
 268                         unsigned long *ino);
 269
 270 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
 271                                 size_t count, loff_t *ppos)
 272 {
 273         char tmpbuf[TMPBUFLEN];
 274         ssize_t length;
 275
 276         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
 277         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 278 }
 279
 280 static const struct file_operations sel_mls_ops = {
 281         .read           = sel_read_mls,
 282 };
 283
 284 static ssize_t sel_write_load(struct file * file, const char __user * buf,
 285                               size_t count, loff_t *ppos)
 286
 287 {
 288         int ret;
 289         ssize_t length;
 290         void *data = NULL;
 291
 292         mutex_lock(&sel_mutex);
 293
 294         length = task_has_security(current, SECURITY__LOAD_POLICY);
 295         if (length)
 296                 goto out;
 297
 298         if (*ppos != 0) {
 299                 /* No partial writes. */
 300                 length = -EINVAL;
 301                 goto out;
 302         }
 303
 304         if ((count > 64 * 1024 * 1024)
 305             || (data = vmalloc(count)) == NULL) {
 306                 length = -ENOMEM;
 307                 goto out;
 308         }
 309
 310         length = -EFAULT;
 311         if (copy_from_user(data, buf, count) != 0)
 312                 goto out;
 313
 314         length = security_load_policy(data, count);
 315         if (length)
 316                 goto out;
 317
 318         ret = sel_make_bools();
 319         if (ret) {
 320                 length = ret;
 321                 goto out1;
 322         }
 323
 324         ret = sel_make_classes();
 325         if (ret)
 326                 length = ret;
 327         else
 328                 length = count;
 329
 330 out1:
 331
 332         printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
 333                (security_get_reject_unknown() ? "reject" :
 334                 (security_get_allow_unknown() ? "allow" : "deny")));
 335
 336         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 337                 "policy loaded auid=%u",
 338                 audit_get_loginuid(current->audit_context));
 339 out:
 340         mutex_unlock(&sel_mutex);
 341         vfree(data);
 342         return length;
 343 }
 344
 345 static const struct file_operations sel_load_ops = {
 346         .write          = sel_write_load,
 347 };
 348
 349 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
 350 {
 351         char *canon;
 352         u32 sid, len;
 353         ssize_t length;
 354
 355         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
 356         if (length)
 357                 return length;
 358
 359         length = security_context_to_sid(buf, size, &sid);
 360         if (length < 0)
 361                 return length;
 362
 363         length = security_sid_to_context(sid, &canon, &len);
 364         if (length < 0)
 365                 return length;
 366
 367         if (len > SIMPLE_TRANSACTION_LIMIT) {
 368                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 369                        "max\n", __FUNCTION__, len);
 370                 length = -ERANGE;
 371                 goto out;
 372         }
 373
 374         memcpy(buf, canon, len);
 375         length = len;
 376 out:
 377         kfree(canon);
 378         return length;
 379 }
 380
 381 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
 382                                      size_t count, loff_t *ppos)
 383 {
 384         char tmpbuf[TMPBUFLEN];
 385         ssize_t length;
 386
 387         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
 388         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 389 }
 390
 391 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
 392                                       size_t count, loff_t *ppos)
 393 {
 394         char *page;
 395         ssize_t length;
 396         unsigned int new_value;
 397
 398         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
 399         if (length)
 400                 return length;
 401
 402         if (count >= PAGE_SIZE)
 403                 return -ENOMEM;
 404         if (*ppos != 0) {
 405                 /* No partial writes. */
 406                 return -EINVAL;
 407         }
 408         page = (char*)get_zeroed_page(GFP_KERNEL);
 409         if (!page)
 410                 return -ENOMEM;
 411         length = -EFAULT;
 412         if (copy_from_user(page, buf, count))
 413                 goto out;
 414
 415         length = -EINVAL;
 416         if (sscanf(page, "%u", &new_value) != 1)
 417                 goto out;
 418
 419         selinux_checkreqprot = new_value ? 1 : 0;
 420         length = count;
 421 out:
 422         free_page((unsigned long) page);
 423         return length;
 424 }
 425 static const struct file_operations sel_checkreqprot_ops = {
 426         .read           = sel_read_checkreqprot,
 427         .write          = sel_write_checkreqprot,
 428 };
 429
 430 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
 431                                    size_t count, loff_t *ppos)
 432 {
 433         char tmpbuf[TMPBUFLEN];
 434         ssize_t length;
 435
 436         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
 437         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
 438 }
 439
 440 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
 441                                     size_t count, loff_t *ppos)
 442 {
 443         char *page;
 444         ssize_t length;
 445         int new_value;
 446
 447         length = task_has_security(current, SECURITY__LOAD_POLICY);
 448         if (length)
 449                 return length;
 450
 451         if (count >= PAGE_SIZE)
 452                 return -ENOMEM;
 453         if (*ppos != 0) {
 454                 /* No partial writes. */
 455                 return -EINVAL;
 456         }
 457         page = (char*)get_zeroed_page(GFP_KERNEL);
 458         if (!page)
 459                 return -ENOMEM;
 460         length = -EFAULT;
 461         if (copy_from_user(page, buf, count))
 462                 goto out;
 463
 464         length = -EINVAL;
 465         if (sscanf(page, "%d", &new_value) != 1)
 466                 goto out;
 467
 468         selinux_compat_net = new_value ? 1 : 0;
 469         length = count;
 470 out:
 471         free_page((unsigned long) page);
 472         return length;
 473 }
 474 static const struct file_operations sel_compat_net_ops = {
 475         .read           = sel_read_compat_net,
 476         .write          = sel_write_compat_net,
 477 };
 478
 479 /*
 480  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
 481  */
 482 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
 483 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
 484 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
 485 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
 486 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
 487
 488 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
 489         [SEL_ACCESS] = sel_write_access,
 490         [SEL_CREATE] = sel_write_create,
 491         [SEL_RELABEL] = sel_write_relabel,
 492         [SEL_USER] = sel_write_user,
 493         [SEL_MEMBER] = sel_write_member,
 494         [SEL_CONTEXT] = sel_write_context,
 495 };
 496
 497 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 498 {
 499         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
 500         char *data;
 501         ssize_t rv;
 502
 503         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
 504                 return -EINVAL;
 505
 506         data = simple_transaction_get(file, buf, size);
 507         if (IS_ERR(data))
 508                 return PTR_ERR(data);
 509
 510         rv =  write_op[ino](file, data, size);
 511         if (rv>0) {
 512                 simple_transaction_set(file, rv);
 513                 rv = size;
 514         }
 515         return rv;
 516 }
 517
 518 static const struct file_operations transaction_ops = {
 519         .write          = selinux_transaction_write,
 520         .read           = simple_transaction_read,
 521         .release        = simple_transaction_release,
 522 };
 523
 524 /*
 525  * payload - write methods
 526  * If the method has a response, the response should be put in buf,
 527  * and the length returned.  Otherwise return 0 or and -error.
 528  */
 529
 530 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
 531 {
 532         char *scon, *tcon;
 533         u32 ssid, tsid;
 534         u16 tclass;
 535         u32 req;
 536         struct av_decision avd;
 537         ssize_t length;
 538
 539         length = task_has_security(current, SECURITY__COMPUTE_AV);
 540         if (length)
 541                 return length;
 542
 543         length = -ENOMEM;
 544         scon = kzalloc(size+1, GFP_KERNEL);
 545         if (!scon)
 546                 return length;
 547
 548         tcon = kzalloc(size+1, GFP_KERNEL);
 549         if (!tcon)
 550                 goto out;
 551
 552         length = -EINVAL;
 553         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
 554                 goto out2;
 555
 556         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 557         if (length < 0)
 558                 goto out2;
 559         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 560         if (length < 0)
 561                 goto out2;
 562
 563         length = security_compute_av(ssid, tsid, tclass, req, &avd);
 564         if (length < 0)
 565                 goto out2;
 566
 567         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
 568                           "%x %x %x %x %u",
 569                           avd.allowed, avd.decided,
 570                           avd.auditallow, avd.auditdeny,
 571                           avd.seqno);
 572 out2:
 573         kfree(tcon);
 574 out:
 575         kfree(scon);
 576         return length;
 577 }
 578
 579 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
 580 {
 581         char *scon, *tcon;
 582         u32 ssid, tsid, newsid;
 583         u16 tclass;
 584         ssize_t length;
 585         char *newcon;
 586         u32 len;
 587
 588         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
 589         if (length)
 590                 return length;
 591
 592         length = -ENOMEM;
 593         scon = kzalloc(size+1, GFP_KERNEL);
 594         if (!scon)
 595                 return length;
 596
 597         tcon = kzalloc(size+1, GFP_KERNEL);
 598         if (!tcon)
 599                 goto out;
 600
 601         length = -EINVAL;
 602         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 603                 goto out2;
 604
 605         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 606         if (length < 0)
 607                 goto out2;
 608         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 609         if (length < 0)
 610                 goto out2;
 611
 612         length = security_transition_sid(ssid, tsid, tclass, &newsid);
 613         if (length < 0)
 614                 goto out2;
 615
 616         length = security_sid_to_context(newsid, &newcon, &len);
 617         if (length < 0)
 618                 goto out2;
 619
 620         if (len > SIMPLE_TRANSACTION_LIMIT) {
 621                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 622                        "max\n", __FUNCTION__, len);
 623                 length = -ERANGE;
 624                 goto out3;
 625         }
 626
 627         memcpy(buf, newcon, len);
 628         length = len;
 629 out3:
 630         kfree(newcon);
 631 out2:
 632         kfree(tcon);
 633 out:
 634         kfree(scon);
 635         return length;
 636 }
 637
 638 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
 639 {
 640         char *scon, *tcon;
 641         u32 ssid, tsid, newsid;
 642         u16 tclass;
 643         ssize_t length;
 644         char *newcon;
 645         u32 len;
 646
 647         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
 648         if (length)
 649                 return length;
 650
 651         length = -ENOMEM;
 652         scon = kzalloc(size+1, GFP_KERNEL);
 653         if (!scon)
 654                 return length;
 655
 656         tcon = kzalloc(size+1, GFP_KERNEL);
 657         if (!tcon)
 658                 goto out;
 659
 660         length = -EINVAL;
 661         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 662                 goto out2;
 663
 664         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 665         if (length < 0)
 666                 goto out2;
 667         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 668         if (length < 0)
 669                 goto out2;
 670
 671         length = security_change_sid(ssid, tsid, tclass, &newsid);
 672         if (length < 0)
 673                 goto out2;
 674
 675         length = security_sid_to_context(newsid, &newcon, &len);
 676         if (length < 0)
 677                 goto out2;
 678
 679         if (len > SIMPLE_TRANSACTION_LIMIT) {
 680                 length = -ERANGE;
 681                 goto out3;
 682         }
 683
 684         memcpy(buf, newcon, len);
 685         length = len;
 686 out3:
 687         kfree(newcon);
 688 out2:
 689         kfree(tcon);
 690 out:
 691         kfree(scon);
 692         return length;
 693 }
 694
 695 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
 696 {
 697         char *con, *user, *ptr;
 698         u32 sid, *sids;
 699         ssize_t length;
 700         char *newcon;
 701         int i, rc;
 702         u32 len, nsids;
 703
 704         length = task_has_security(current, SECURITY__COMPUTE_USER);
 705         if (length)
 706                 return length;
 707
 708         length = -ENOMEM;
 709         con = kzalloc(size+1, GFP_KERNEL);
 710         if (!con)
 711                 return length;
 712
 713         user = kzalloc(size+1, GFP_KERNEL);
 714         if (!user)
 715                 goto out;
 716
 717         length = -EINVAL;
 718         if (sscanf(buf, "%s %s", con, user) != 2)
 719                 goto out2;
 720
 721         length = security_context_to_sid(con, strlen(con)+1, &sid);
 722         if (length < 0)
 723                 goto out2;
 724
 725         length = security_get_user_sids(sid, user, &sids, &nsids);
 726         if (length < 0)
 727                 goto out2;
 728
 729         length = sprintf(buf, "%u", nsids) + 1;
 730         ptr = buf + length;
 731         for (i = 0; i < nsids; i++) {
 732                 rc = security_sid_to_context(sids[i], &newcon, &len);
 733                 if (rc) {
 734                         length = rc;
 735                         goto out3;
 736                 }
 737                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
 738                         kfree(newcon);
 739                         length = -ERANGE;
 740                         goto out3;
 741                 }
 742                 memcpy(ptr, newcon, len);
 743                 kfree(newcon);
 744                 ptr += len;
 745                 length += len;
 746         }
 747 out3:
 748         kfree(sids);
 749 out2:
 750         kfree(user);
 751 out:
 752         kfree(con);
 753         return length;
 754 }
 755
 756 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
 757 {
 758         char *scon, *tcon;
 759         u32 ssid, tsid, newsid;
 760         u16 tclass;
 761         ssize_t length;
 762         char *newcon;
 763         u32 len;
 764
 765         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
 766         if (length)
 767                 return length;
 768
 769         length = -ENOMEM;
 770         scon = kzalloc(size+1, GFP_KERNEL);
 771         if (!scon)
 772                 return length;
 773
 774         tcon = kzalloc(size+1, GFP_KERNEL);
 775         if (!tcon)
 776                 goto out;
 777
 778         length = -EINVAL;
 779         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
 780                 goto out2;
 781
 782         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
 783         if (length < 0)
 784                 goto out2;
 785         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
 786         if (length < 0)
 787                 goto out2;
 788
 789         length = security_member_sid(ssid, tsid, tclass, &newsid);
 790         if (length < 0)
 791                 goto out2;
 792
 793         length = security_sid_to_context(newsid, &newcon, &len);
 794         if (length < 0)
 795                 goto out2;
 796
 797         if (len > SIMPLE_TRANSACTION_LIMIT) {
 798                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
 799                        "max\n", __FUNCTION__, len);
 800                 length = -ERANGE;
 801                 goto out3;
 802         }
 803
 804         memcpy(buf, newcon, len);
 805         length = len;
 806 out3:
 807         kfree(newcon);
 808 out2:
 809         kfree(tcon);
 810 out:
 811         kfree(scon);
 812         return length;
 813 }
 814
 815 static struct inode *sel_make_inode(struct super_block *sb, int mode)
 816 {
 817         struct inode *ret = new_inode(sb);
 818
 819         if (ret) {
 820                 ret->i_mode = mode;
 821                 ret->i_uid = ret->i_gid = 0;
 822                 ret->i_blocks = 0;
 823                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
 824         }
 825         return ret;
 826 }
 827
 828 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
 829                              size_t count, loff_t *ppos)
 830 {
 831         char *page = NULL;
 832         ssize_t length;
 833         ssize_t ret;
 834         int cur_enforcing;
 835         struct inode *inode;
 836
 837         mutex_lock(&sel_mutex);
 838
 839         ret = -EFAULT;
 840
 841         if (count > PAGE_SIZE) {
 842                 ret = -EINVAL;
 843                 goto out;
 844         }
 845         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
 846                 ret = -ENOMEM;
 847                 goto out;
 848         }
 849
 850         inode = filep->f_path.dentry->d_inode;
 851         cur_enforcing = security_get_bool_value(inode->i_ino&SEL_INO_MASK);
 852         if (cur_enforcing < 0) {
 853                 ret = cur_enforcing;
 854                 goto out;
 855         }
 856
 857         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
 858                           bool_pending_values[inode->i_ino&SEL_INO_MASK]);
 859         ret = simple_read_from_buffer(buf, count, ppos, page, length);
 860 out:
 861         mutex_unlock(&sel_mutex);
 862         if (page)
 863                 free_page((unsigned long)page);
 864         return ret;
 865 }
 866
 867 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
 868                               size_t count, loff_t *ppos)
 869 {
 870         char *page = NULL;
 871         ssize_t length = -EFAULT;
 872         int new_value;
 873         struct inode *inode;
 874
 875         mutex_lock(&sel_mutex);
 876
 877         length = task_has_security(current, SECURITY__SETBOOL);
 878         if (length)
 879                 goto out;
 880
 881         if (count >= PAGE_SIZE) {
 882                 length = -ENOMEM;
 883                 goto out;
 884         }
 885         if (*ppos != 0) {
 886                 /* No partial writes. */
 887                 goto out;
 888         }
 889         page = (char*)get_zeroed_page(GFP_KERNEL);
 890         if (!page) {
 891                 length = -ENOMEM;
 892                 goto out;
 893         }
 894
 895         if (copy_from_user(page, buf, count))
 896                 goto out;
 897
 898         length = -EINVAL;
 899         if (sscanf(page, "%d", &new_value) != 1)
 900                 goto out;
 901
 902         if (new_value)
 903                 new_value = 1;
 904
 905         inode = filep->f_path.dentry->d_inode;
 906         bool_pending_values[inode->i_ino&SEL_INO_MASK] = new_value;
 907         length = count;
 908
 909 out:
 910         mutex_unlock(&sel_mutex);
 911         if (page)
 912                 free_page((unsigned long) page);
 913         return length;
 914 }
 915
 916 static const struct file_operations sel_bool_ops = {
 917         .read           = sel_read_bool,
 918         .write          = sel_write_bool,
 919 };
 920
 921 static ssize_t sel_commit_bools_write(struct file *filep,
 922                                       const char __user *buf,
 923                                       size_t count, loff_t *ppos)
 924 {
 925         char *page = NULL;
 926         ssize_t length = -EFAULT;
 927         int new_value;
 928
 929         mutex_lock(&sel_mutex);
 930
 931         length = task_has_security(current, SECURITY__SETBOOL);
 932         if (length)
 933                 goto out;
 934
 935         if (count >= PAGE_SIZE) {
 936                 length = -ENOMEM;
 937                 goto out;
 938         }
 939         if (*ppos != 0) {
 940                 /* No partial writes. */
 941                 goto out;
 942         }
 943         page = (char*)get_zeroed_page(GFP_KERNEL);
 944         if (!page) {
 945                 length = -ENOMEM;
 946                 goto out;
 947         }
 948
 949         if (copy_from_user(page, buf, count))
 950                 goto out;
 951
 952         length = -EINVAL;
 953         if (sscanf(page, "%d", &new_value) != 1)
 954                 goto out;
 955
 956         if (new_value && bool_pending_values) {
 957                 security_set_bools(bool_num, bool_pending_values);
 958         }
 959
 960         length = count;
 961
 962 out:
 963         mutex_unlock(&sel_mutex);
 964         if (page)
 965                 free_page((unsigned long) page);
 966         return length;
 967 }
 968
 969 static const struct file_operations sel_commit_bools_ops = {
 970         .write          = sel_commit_bools_write,
 971 };
 972
 973 static void sel_remove_entries(struct dentry *de)
 974 {
 975         struct list_head *node;
 976
 977         spin_lock(&dcache_lock);
 978         node = de->d_subdirs.next;
 979         while (node != &de->d_subdirs) {
 980                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
 981                 list_del_init(node);
 982
 983                 if (d->d_inode) {
 984                         d = dget_locked(d);
 985                         spin_unlock(&dcache_lock);
 986                         d_delete(d);
 987                         simple_unlink(de->d_inode, d);
 988                         dput(d);
 989                         spin_lock(&dcache_lock);
 990                 }
 991                 node = de->d_subdirs.next;
 992         }
 993
 994         spin_unlock(&dcache_lock);
 995 }
 996
 997 #define BOOL_DIR_NAME "booleans"
 998
 999 static int sel_make_bools(void)
1000 {
1001         int i, ret = 0;
1002         ssize_t len;
1003         struct dentry *dentry = NULL;
1004         struct dentry *dir = bool_dir;
1005         struct inode *inode = NULL;
1006         struct inode_security_struct *isec;
1007         char **names = NULL, *page;
1008         int num;
1009         int *values = NULL;
1010         u32 sid;
1011
1012         /* remove any existing files */
1013         kfree(bool_pending_values);
1014         bool_pending_values = NULL;
1015
1016         sel_remove_entries(dir);
1017
1018         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1019                 return -ENOMEM;
1020
1021         ret = security_get_bools(&num, &names, &values);
1022         if (ret != 0)
1023                 goto out;
1024
1025         for (i = 0; i < num; i++) {
1026                 dentry = d_alloc_name(dir, names[i]);
1027                 if (!dentry) {
1028                         ret = -ENOMEM;
1029                         goto err;
1030                 }
1031                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1032                 if (!inode) {
1033                         ret = -ENOMEM;
1034                         goto err;
1035                 }
1036
1037                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1038                 if (len < 0) {
1039                         ret = -EINVAL;
1040                         goto err;
1041                 } else if (len >= PAGE_SIZE) {
1042                         ret = -ENAMETOOLONG;
1043                         goto err;
1044                 }
1045                 isec = (struct inode_security_struct*)inode->i_security;
1046                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1047                         goto err;
1048                 isec->sid = sid;
1049                 isec->initialized = 1;
1050                 inode->i_fop = &sel_bool_ops;
1051                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1052                 d_add(dentry, inode);
1053         }
1054         bool_num = num;
1055         bool_pending_values = values;
1056 out:
1057         free_page((unsigned long)page);
1058         if (names) {
1059                 for (i = 0; i < num; i++)
1060                         kfree(names[i]);
1061                 kfree(names);
1062         }
1063         return ret;
1064 err:
1065         kfree(values);
1066         sel_remove_entries(dir);
1067         ret = -ENOMEM;
1068         goto out;
1069 }
1070
1071 #define NULL_FILE_NAME "null"
1072
1073 struct dentry *selinux_null = NULL;
1074
1075 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1076                                             size_t count, loff_t *ppos)
1077 {
1078         char tmpbuf[TMPBUFLEN];
1079         ssize_t length;
1080
1081         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1082         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1083 }
1084
1085 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1086                                              const char __user * buf,
1087                                              size_t count, loff_t *ppos)
1088
1089 {
1090         char *page;
1091         ssize_t ret;
1092         int new_value;
1093
1094         if (count >= PAGE_SIZE) {
1095                 ret = -ENOMEM;
1096                 goto out;
1097         }
1098
1099         if (*ppos != 0) {
1100                 /* No partial writes. */
1101                 ret = -EINVAL;
1102                 goto out;
1103         }
1104
1105         page = (char*)get_zeroed_page(GFP_KERNEL);
1106         if (!page) {
1107                 ret = -ENOMEM;
1108                 goto out;
1109         }
1110
1111         if (copy_from_user(page, buf, count)) {
1112                 ret = -EFAULT;
1113                 goto out_free;
1114         }
1115
1116         if (sscanf(page, "%u", &new_value) != 1) {
1117                 ret = -EINVAL;
1118                 goto out;
1119         }
1120
1121         if (new_value != avc_cache_threshold) {
1122                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1123                 if (ret)
1124                         goto out_free;
1125                 avc_cache_threshold = new_value;
1126         }
1127         ret = count;
1128 out_free:
1129         free_page((unsigned long)page);
1130 out:
1131         return ret;
1132 }
1133
1134 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1135                                        size_t count, loff_t *ppos)
1136 {
1137         char *page;
1138         ssize_t ret = 0;
1139
1140         page = (char *)__get_free_page(GFP_KERNEL);
1141         if (!page) {
1142                 ret = -ENOMEM;
1143                 goto out;
1144         }
1145         ret = avc_get_hash_stats(page);
1146         if (ret >= 0)
1147                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1148         free_page((unsigned long)page);
1149 out:
1150         return ret;
1151 }
1152
1153 static const struct file_operations sel_avc_cache_threshold_ops = {
1154         .read           = sel_read_avc_cache_threshold,
1155         .write          = sel_write_avc_cache_threshold,
1156 };
1157
1158 static const struct file_operations sel_avc_hash_stats_ops = {
1159         .read           = sel_read_avc_hash_stats,
1160 };
1161
1162 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1163 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1164 {
1165         int cpu;
1166
1167         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1168                 if (!cpu_possible(cpu))
1169                         continue;
1170                 *idx = cpu + 1;
1171                 return &per_cpu(avc_cache_stats, cpu);
1172         }
1173         return NULL;
1174 }
1175
1176 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1177 {
1178         loff_t n = *pos - 1;
1179
1180         if (*pos == 0)
1181                 return SEQ_START_TOKEN;
1182
1183         return sel_avc_get_stat_idx(&n);
1184 }
1185
1186 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1187 {
1188         return sel_avc_get_stat_idx(pos);
1189 }
1190
1191 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1192 {
1193         struct avc_cache_stats *st = v;
1194
1195         if (v == SEQ_START_TOKEN)
1196                 seq_printf(seq, "lookups hits misses allocations reclaims "
1197                            "frees\n");
1198         else
1199                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1200                            st->hits, st->misses, st->allocations,
1201                            st->reclaims, st->frees);
1202         return 0;
1203 }
1204
1205 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1206 { }
1207
1208 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1209         .start          = sel_avc_stats_seq_start,
1210         .next           = sel_avc_stats_seq_next,
1211         .show           = sel_avc_stats_seq_show,
1212         .stop           = sel_avc_stats_seq_stop,
1213 };
1214
1215 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1216 {
1217         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1218 }
1219
1220 static const struct file_operations sel_avc_cache_stats_ops = {
1221         .open           = sel_open_avc_cache_stats,
1222         .read           = seq_read,
1223         .llseek         = seq_lseek,
1224         .release        = seq_release,
1225 };
1226 #endif
1227
1228 static int sel_make_avc_files(struct dentry *dir)
1229 {
1230         int i, ret = 0;
1231         static struct tree_descr files[] = {
1232                 { "cache_threshold",
1233                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1234                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1235 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1236                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1237 #endif
1238         };
1239
1240         for (i = 0; i < ARRAY_SIZE(files); i++) {
1241                 struct inode *inode;
1242                 struct dentry *dentry;
1243
1244                 dentry = d_alloc_name(dir, files[i].name);
1245                 if (!dentry) {
1246                         ret = -ENOMEM;
1247                         goto out;
1248                 }
1249
1250                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1251                 if (!inode) {
1252                         ret = -ENOMEM;
1253                         goto out;
1254                 }
1255                 inode->i_fop = files[i].ops;
1256                 inode->i_ino = ++sel_last_ino;
1257                 d_add(dentry, inode);
1258         }
1259 out:
1260         return ret;
1261 }
1262
1263 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1264                                 size_t count, loff_t *ppos)
1265 {
1266         struct inode *inode;
1267         char *con;
1268         u32 sid, len;
1269         ssize_t ret;
1270
1271         inode = file->f_path.dentry->d_inode;
1272         sid = inode->i_ino&SEL_INO_MASK;
1273         ret = security_sid_to_context(sid, &con, &len);
1274         if (ret < 0)
1275                 return ret;
1276
1277         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1278         kfree(con);
1279         return ret;
1280 }
1281
1282 static const struct file_operations sel_initcon_ops = {
1283         .read           = sel_read_initcon,
1284 };
1285
1286 static int sel_make_initcon_files(struct dentry *dir)
1287 {
1288         int i, ret = 0;
1289
1290         for (i = 1; i <= SECINITSID_NUM; i++) {
1291                 struct inode *inode;
1292                 struct dentry *dentry;
1293                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1294                 if (!dentry) {
1295                         ret = -ENOMEM;
1296                         goto out;
1297                 }
1298
1299                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1300                 if (!inode) {
1301                         ret = -ENOMEM;
1302                         goto out;
1303                 }
1304                 inode->i_fop = &sel_initcon_ops;
1305                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1306                 d_add(dentry, inode);
1307         }
1308 out:
1309         return ret;
1310 }
1311
1312 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1313 {
1314         return a / b - (a % b < 0);
1315 }
1316
1317 static inline unsigned long sel_class_to_ino(u16 class)
1318 {
1319         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1320 }
1321
1322 static inline u16 sel_ino_to_class(unsigned long ino)
1323 {
1324         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1325 }
1326
1327 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1328 {
1329         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1330 }
1331
1332 static inline u32 sel_ino_to_perm(unsigned long ino)
1333 {
1334         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1335 }
1336
1337 static ssize_t sel_read_class(struct file * file, char __user *buf,
1338                                 size_t count, loff_t *ppos)
1339 {
1340         ssize_t rc, len;
1341         char *page;
1342         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1343
1344         page = (char *)__get_free_page(GFP_KERNEL);
1345         if (!page) {
1346                 rc = -ENOMEM;
1347                 goto out;
1348         }
1349
1350         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1351         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1352         free_page((unsigned long)page);
1353 out:
1354         return rc;
1355 }
1356
1357 static const struct file_operations sel_class_ops = {
1358         .read           = sel_read_class,
1359 };
1360
1361 static ssize_t sel_read_perm(struct file * file, char __user *buf,
1362                                 size_t count, loff_t *ppos)
1363 {
1364         ssize_t rc, len;
1365         char *page;
1366         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1367
1368         page = (char *)__get_free_page(GFP_KERNEL);
1369         if (!page) {
1370                 rc = -ENOMEM;
1371                 goto out;
1372         }
1373
1374         len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino));
1375         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1376         free_page((unsigned long)page);
1377 out:
1378         return rc;
1379 }
1380
1381 static const struct file_operations sel_perm_ops = {
1382         .read           = sel_read_perm,
1383 };
1384
1385 static int sel_make_perm_files(char *objclass, int classvalue,
1386                                 struct dentry *dir)
1387 {
1388         int i, rc = 0, nperms;
1389         char **perms;
1390
1391         rc = security_get_permissions(objclass, &perms, &nperms);
1392         if (rc)
1393                 goto out;
1394
1395         for (i = 0; i < nperms; i++) {
1396                 struct inode *inode;
1397                 struct dentry *dentry;
1398
1399                 dentry = d_alloc_name(dir, perms[i]);
1400                 if (!dentry) {
1401                         rc = -ENOMEM;
1402                         goto out1;
1403                 }
1404
1405                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1406                 if (!inode) {
1407                         rc = -ENOMEM;
1408                         goto out1;
1409                 }
1410                 inode->i_fop = &sel_perm_ops;
1411                 /* i+1 since perm values are 1-indexed */
1412                 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1413                 d_add(dentry, inode);
1414         }
1415
1416 out1:
1417         for (i = 0; i < nperms; i++)
1418                 kfree(perms[i]);
1419         kfree(perms);
1420 out:
1421         return rc;
1422 }
1423
1424 static int sel_make_class_dir_entries(char *classname, int index,
1425                                         struct dentry *dir)
1426 {
1427         struct dentry *dentry = NULL;
1428         struct inode *inode = NULL;
1429         int rc;
1430
1431         dentry = d_alloc_name(dir, "index");
1432         if (!dentry) {
1433                 rc = -ENOMEM;
1434                 goto out;
1435         }
1436
1437         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1438         if (!inode) {
1439                 rc = -ENOMEM;
1440                 goto out;
1441         }
1442
1443         inode->i_fop = &sel_class_ops;
1444         inode->i_ino = sel_class_to_ino(index);
1445         d_add(dentry, inode);
1446
1447         dentry = d_alloc_name(dir, "perms");
1448         if (!dentry) {
1449                 rc = -ENOMEM;
1450                 goto out;
1451         }
1452
1453         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1454         if (rc)
1455                 goto out;
1456
1457         rc = sel_make_perm_files(classname, index, dentry);
1458
1459 out:
1460         return rc;
1461 }
1462
1463 static void sel_remove_classes(void)
1464 {
1465         struct list_head *class_node;
1466
1467         list_for_each(class_node, &class_dir->d_subdirs) {
1468                 struct dentry *class_subdir = list_entry(class_node,
1469                                         struct dentry, d_u.d_child);
1470                 struct list_head *class_subdir_node;
1471
1472                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1473                         struct dentry *d = list_entry(class_subdir_node,
1474                                                 struct dentry, d_u.d_child);
1475
1476                         if (d->d_inode)
1477                                 if (d->d_inode->i_mode & S_IFDIR)
1478                                         sel_remove_entries(d);
1479                 }
1480
1481                 sel_remove_entries(class_subdir);
1482         }
1483
1484         sel_remove_entries(class_dir);
1485 }
1486
1487 static int sel_make_classes(void)
1488 {
1489         int rc = 0, nclasses, i;
1490         char **classes;
1491
1492         /* delete any existing entries */
1493         sel_remove_classes();
1494
1495         rc = security_get_classes(&classes, &nclasses);
1496         if (rc < 0)
1497                 goto out;
1498
1499         /* +2 since classes are 1-indexed */
1500         last_class_ino = sel_class_to_ino(nclasses+2);
1501
1502         for (i = 0; i < nclasses; i++) {
1503                 struct dentry *class_name_dir;
1504
1505                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1506                 if (!class_name_dir) {
1507                         rc = -ENOMEM;
1508                         goto out1;
1509                 }
1510
1511                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1512                                 &last_class_ino);
1513                 if (rc)
1514                         goto out1;
1515
1516                 /* i+1 since class values are 1-indexed */
1517                 rc = sel_make_class_dir_entries(classes[i], i+1,
1518                                 class_name_dir);
1519                 if (rc)
1520                         goto out1;
1521         }
1522
1523 out1:
1524         for (i = 0; i < nclasses; i++)
1525                 kfree(classes[i]);
1526         kfree(classes);
1527 out:
1528         return rc;
1529 }
1530
1531 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1532                         unsigned long *ino)
1533 {
1534         int ret = 0;
1535         struct inode *inode;
1536
1537         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1538         if (!inode) {
1539                 ret = -ENOMEM;
1540                 goto out;
1541         }
1542         inode->i_op = &simple_dir_inode_operations;
1543         inode->i_fop = &simple_dir_operations;
1544         inode->i_ino = ++(*ino);
1545         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1546         inc_nlink(inode);
1547         d_add(dentry, inode);
1548         /* bump link count on parent directory, too */
1549         inc_nlink(dir);
1550 out:
1551         return ret;
1552 }
1553
1554 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1555 {
1556         int ret;
1557         struct dentry *dentry;
1558         struct inode *inode, *root_inode;
1559         struct inode_security_struct *isec;
1560
1561         static struct tree_descr selinux_files[] = {
1562                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1563                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1564                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1565                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1566                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1567                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1568                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1569                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1570                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1571                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1572                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1573                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1574                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1575                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1576                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1577                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1578                 /* last one */ {""}
1579         };
1580         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1581         if (ret)
1582                 goto err;
1583
1584         root_inode = sb->s_root->d_inode;
1585
1586         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1587         if (!dentry) {
1588                 ret = -ENOMEM;
1589                 goto err;
1590         }
1591
1592         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1593         if (ret)
1594                 goto err;
1595
1596         bool_dir = dentry;
1597
1598         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1599         if (!dentry) {
1600                 ret = -ENOMEM;
1601                 goto err;
1602         }
1603
1604         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1605         if (!inode) {
1606                 ret = -ENOMEM;
1607                 goto err;
1608         }
1609         inode->i_ino = ++sel_last_ino;
1610         isec = (struct inode_security_struct*)inode->i_security;
1611         isec->sid = SECINITSID_DEVNULL;
1612         isec->sclass = SECCLASS_CHR_FILE;
1613         isec->initialized = 1;
1614
1615         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1616         d_add(dentry, inode);
1617         selinux_null = dentry;
1618
1619         dentry = d_alloc_name(sb->s_root, "avc");
1620         if (!dentry) {
1621                 ret = -ENOMEM;
1622                 goto err;
1623         }
1624
1625         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1626         if (ret)
1627                 goto err;
1628
1629         ret = sel_make_avc_files(dentry);
1630         if (ret)
1631                 goto err;
1632
1633         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1634         if (!dentry) {
1635                 ret = -ENOMEM;
1636                 goto err;
1637         }
1638
1639         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1640         if (ret)
1641                 goto err;
1642
1643         ret = sel_make_initcon_files(dentry);
1644         if (ret)
1645                 goto err;
1646
1647         dentry = d_alloc_name(sb->s_root, "class");
1648         if (!dentry) {
1649                 ret = -ENOMEM;
1650                 goto err;
1651         }
1652
1653         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1654         if (ret)
1655                 goto err;
1656
1657         class_dir = dentry;
1658
1659 out:
1660         return ret;
1661 err:
1662         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1663         goto out;
1664 }
1665
1666 static int sel_get_sb(struct file_system_type *fs_type,
1667                       int flags, const char *dev_name, void *data,
1668                       struct vfsmount *mnt)
1669 {
1670         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1671 }
1672
1673 static struct file_system_type sel_fs_type = {
1674         .name           = "selinuxfs",
1675         .get_sb         = sel_get_sb,
1676         .kill_sb        = kill_litter_super,
1677 };
1678
1679 struct vfsmount *selinuxfs_mount;
1680
1681 static int __init init_sel_fs(void)
1682 {
1683         int err;
1684
1685         if (!selinux_enabled)
1686                 return 0;
1687         err = register_filesystem(&sel_fs_type);
1688         if (!err) {
1689                 selinuxfs_mount = kern_mount(&sel_fs_type);
1690                 if (IS_ERR(selinuxfs_mount)) {
1691                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1692                         err = PTR_ERR(selinuxfs_mount);
1693                         selinuxfs_mount = NULL;
1694                 }
1695         }
1696         return err;
1697 }
1698
1699 __initcall(init_sel_fs);
1700
1701 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1702 void exit_sel_fs(void)
1703 {
1704         unregister_filesystem(&sel_fs_type);
1705 }
1706 #endif