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